JP6920750B2 - Display device and pixel unit - Google Patents

Description

The present invention relates to a display device and a pixel unit.

A liquid crystal display is used as a display device such as a display. In a large display such as 100 inches or more, an LED display using a light emitting diode (LED) is used. The LED display realizes a full-color display by combining a red LED, a green LED, and a blue LED for each pixel.

Since such an LED display is configured by arranging LEDs for each pixel in a rectangular display area, generally, as the screen size of the display increases, the amount of LEDs used increases, and power consumption corresponds to this. Will also increase. In order to reduce the amount of LED used, it is conceivable to reduce the pixel density. The larger the gap (pitch) between the pixels, the smaller the amount of LED used, but conversely the lower the resolution that can be displayed. In particular, since the LED is a point light source, it has a strong straightness, and when the pitch is large, the difference between the light emitting portion and the non-light emitting region becomes remarkable, and a strong dot feeling is felt, resulting in a non-uniform and rough screen.

In this way, there is a trade-off relationship between the reduction in LED usage, that is, the reduction in power consumption, and the display quality. This problem becomes more pronounced as the screen becomes larger, and it is not possible to construct a large display with low power consumption. It was considered difficult. In addition to large displays, in recent years there has been a strong demand for consideration for the global environment, such as power supply shortages due to the Great East Japan Earthquake, shutdown of nuclear power plants, depletion of natural resources such as oil _{, and reduction of CO 2, and reduction of power consumption.} Is an urgent issue.

U.S. Pat. No. 6082885 U.S. Pat. No. 5,873,645

The present invention has been made in view of such a background. One of an object of the present invention is to provide a display device and a pixel unit capable of configuring an LED display with low power consumption.

Means for Solving Problems and Effects of Invention

In order to achieve the above object, according to the display device according to the first aspect of the present invention, the display device is a display device in which a plurality of pixels are arranged at regular intervals, and the outer shape is a hexagon composed of a bottom plate and side surfaces. A reflective structure having a columnar shape and having the entire inner surface of the side surface of the hexagonal columnar as a cavity and one having an open end, and a light-transmitting diffuser arranged at the open end of one end of the hexagonal columnar of the reflective structure. a seat, in the bottom plate is the other end edge of the reflective structure, arranged in the center portion of the bottom plate, the red, green, is composed of a light emitting capable emitting diodes in the blue, the bottom plate The central portion and the peripheral portion in contact with the side surface of the hexagonal columnar are defined as a region in which the light emitting diode is not arranged, and the light emitted by the light emitting diode arranged in the central portion of the bottom plate is emitted by the hexagonal columnar shape. Multiple pixel units that are made to reflect on the inner surface of the side surface of the Regions can be constructed. With the above configuration, the light from the point light source of the light emitting diode is spread in a plane shape by the diffusion sheet, and the surface light emitting region composed of the diffusion sheet is adjacent to each other. The problem that the display surface is uneven due to light emission can be solved. That is, even if the distance between the light emitting diodes is widened, each pixel is used as a planar light source and these are brought close to each other, so that the non-light emitting region existing between the pixels as in the conventional case is reduced and the display area is displayed. Uniform light emission can be obtained as a whole, and as a result, even if the number of light emitting diodes used is reduced, a uniform and high-quality display device with less dot feeling can be realized. Further, a larger display area can be configured by adjoining the pixel light emitting areas of the pixel units. At this time, by making the pixel unit a hexagonal columnar shape, it is possible to obtain sufficient strength and an advantage that the shape is not lost even if a large number of pixel units are stacked.

Further, according to the display device according to the second aspect, a drive circuit for driving the light emitting diode and a communication circuit for enabling the drive circuit to be controlled by a wireless connection from an external device may be further provided. can.

Further, according to the display device according to the third aspect, in addition to the above configuration, the side surface of the reflective structure can be made square. With the above configuration, the light of the light emitting diode arranged in the reflection structure is diffused inside the reflection structure, and can be configured to appear as a diffusion sheet as a planar light source with less shadow and less unevenness.

Furthermore, according to the display device according to the fourth aspect, in addition to the above configuration, the thickness of the diffusion sheet can be 38 μm to 125 μm.

Furthermore, according to the display device according to the fifth aspect, in addition to the above configuration, the diffusion sheet can be made of a hard resin plate and can be composed of a translucent reflector.

Furthermore, according to the display device according to the sixth aspect, in addition to the above configuration, the total light transmittance of the reflector can be 55% to 70%.

Furthermore, according to the display device according to the seventh aspect, in addition to the above configuration, the diffusion sheet is provided with a resin diffusion film coated with a diffusion material, which is laminated on the surface of the reflector. Can be done.

Furthermore, according to the display device according to the eighth aspect, in addition to the above configuration, the diffusion film can be laminated on the reflector so as to be located on the surface side of the pixel unit.

Furthermore, according to the display device according to the ninth aspect, a plurality of the light emitting diodes can be provided, and a lens body covering the plurality of light emitting diodes can be provided. With the above configuration, while increasing the amount of light by using a plurality of light emitting diodes, it is possible to condense these lights so as to be surface-emitting by the diffusion sheet.

Furthermore , according to the display device according to the tenth aspect, in addition to the above configuration, an opening is formed in the central portion of the bottom plate, and the light emitting diode is inserted into the reflection structure through the opening. can do.

Furthermore , according to the display device according to the eleventh embodiment, the light emitting diode has a cylindrical tubular body that can be inserted into the opening and the opening that is formed adjacent to the tubular body. A larger collar is provided, the tubular body forms a threaded groove, and the display device further comprises an annular ring body screwable into the threaded groove, said light emitting. With the tubular body of the diode inserted into the opening from the light emitting surface side of the reflective structure, the ring body is screwed into the thread groove of the tubular body protruding from the back surface side of the reflective structure. Combined, the light emitting diode can be fixed to the reflective structure. With the above configuration, the light emitting diode can be easily fixed to the bottom surface of the reflection structure.

Furthermore , according to the display device according to the twelfth aspect, it is a display device in which a plurality of pixels are arranged at regular intervals, and the outer shape is a hexagonal columnar shape, the inside is a cavity, and one side is an opening end to be reflected on the inner surface. A light-transmitting diffusion sheet arranged at the open end of one end of a hexagonal columnar shape of the reflective structure, and a central portion of the edge of the other edge of the reflective structure. A plurality of pixel units composed of light emitting diodes capable of emitting red, green, and blue light arranged in, and hexagonal columnar side surfaces of each pixel unit are laminated to form a diffusion sheet on the top surface. The pixel light emitting regions are adjacent to each other to form a display region, the diffusion sheet can be attached to and detached from the reflection structure, and the diffusion sheet is detached from the reflection structure. Can be configured to be foldable. With the above configuration, the bulky reflective structure can be folded into a compact state, which is convenient for transportation and storage. In particular, when a large number of reflective structures are used, transportation at low cost and the like can be realized.

Furthermore, according to the display device according to the thirteenth embodiment, the bottom plate of the reflecting structure, so as to be continuous respectively with the side surfaces of the hexagonal prism, it is divided into a plurality of bottom plate pieces, the reflective structure When the bottom plate pieces are in the folded state, each bottom plate piece is separated, and when the reflective structure is in the expanded state, the bottom plate pieces are engaged with each other to form an integral bottom plate, and at the central portion of the bottom plate. A circular opening is formed, and the light emitting diode is formed in a tubular body that can be inserted into the opening and adjacent to the tubular body, and the outer diameter is larger than the inner diameter of the opening. The tubular body forms a threaded groove, and the display device further includes an annular ring body that can be screwed into the threaded groove of the light emitting diode. With the tubular body inserted into the opening from the light emitting surface side of the reflective structure, the ring body is screwed into the thread groove of the tubular body protruding from the back surface side of the reflective structure. The light emitting diode can be fixed to the reflection structure. With the above configuration, by fixing the light emitting diode to the foldable reflective structure, the reflective structure can also be maintained from the folded posture to the unfolded posture.

Furthermore , according to the display device according to the fourteenth aspect, in addition to the above configuration, the central portion is 42% on the line segment from the center of the hexagonal columnar bottom plate of the reflection structure to each apex. It can be inside a hexagonal shape surrounded by dots. With the above configuration, by locating the light emitting diode at the center of the hexagon, it is possible to uniformly emit light in the pixel light emitting region.

Furthermore , according to the display device according to the fifteenth aspect, in addition to the above configuration, the light distribution of the light emitting diode can be set to 100 ° to 150 °. With the above configuration, the pixel light emitting region can be uniformly emitted by locating the peak position of the light distribution of the light emitting diode so as to be substantially in the center of the height of the pixel unit.

Furthermore , according to the display device according to the sixteenth aspect, in addition to the above configuration, the relative luminous intensity at the corner of the pixel light emitting region with respect to the center of the pixel light emitting region can be 70% or more.

Furthermore , according to the display device according to the seventeenth aspect, in addition to the above configuration, the light emitting diode may be a light emitting diode in which a red LED chip, a green LED chip, and a blue LED chip are incorporated in one package. can.

Furthermore , according to the display device according to the eighteenth aspect, in addition to the above configuration, the light emitting diode is an aggregate of light emitting diodes in which a red light emitting diode, a green light emitting diode, and a blue light emitting diode are arranged in close proximity to each other. Can be done.

Furthermore , according to the display device according to the nineteenth aspect, in addition to the above configuration, a connecting mechanism for connecting to another reflective structure can be provided on the side surface of the reflective structure. With the above configuration, pixel units can be connected to each other by a connecting mechanism to construct a large display device. Further, since the pixel units can be connected in a unit type, the size of the display area of the display device can be adjusted by adjusting the number of connections.

Furthermore , according to the display device according to the twentieth aspect, in addition to the above configuration, the inside of the reflective structure can be white. With the above configuration, the reflectance inside the reflective structure can be increased with a simple structure.

Furthermore , according to the display device according to the 21st embodiment, in addition to the above configuration, the reflective structure can be made of paper. With the above configuration, the display device can be configured inexpensively and lightweight.

Furthermore , according to the display device according to the 22nd aspect, in addition to the above configuration, a lid frame that further holds the diffusion sheet and closes the open end of the reflective structure can be provided.

Furthermore , according to the display device according to the 23rd aspect, in addition to the above configuration, the lid frame can be formed into a frame shape that covers the hexagonal outer circumference of the diffusion sheet.

Furthermore , according to the display device according to the 24th embodiment, in addition to the above configuration, the diffusion sheet can be directly attached to the open end of the reflective structure.

Furthermore , according to the display device according to the 25th embodiment, in addition to the above configuration, a common diffusion sheet is attached to the open end of each reflection structure in a state where the plurality of pixel units are adjacent to each other. Can be done.
Furthermore , according to the display device according to the 26th embodiment, in addition to the above configuration, the diffusion sheet can include paper.

Furthermore , according to the pixel unit according to the 27th embodiment, in addition to the above configuration, it is a pixel unit for forming one pixel of a display and combining a plurality of pixels to form a large display device, and has an outer shape . a bottom plate and side and hexagonal prism constituted by a reflective structure one as a whole cavity was open end of the inner face of the side face of the hexagonal prism, the open end of the hexagonal columnar one end of the reflective structure arranged, a diffusion sheet having a light-transmitting property in said bottom plate is the other end edge of the reflective structure, arranged in the center portion of the bottom plate, the red, green, capable of emitting light emitting blue light A diode is provided , and the central portion of the bottom plate and the peripheral portion in contact with the side surface of the hexagonal columnar are defined as a region in which the light emitting diode is not arranged, and light emission is arranged in the central portion of the bottom plate. light diode emitted, said to reflect the inner surface of the hexagonal columnar side surface can be Rukoto. With the above configuration, the light from the point light source of the light emitting diode is spread in a plane shape by the diffusion sheet, and the surface light emitting region composed of the diffusion sheet is adjacent to each other. The problem that the display surface is uneven due to light emission can be solved. That is, even if the distance between the light emitting diodes is widened, each pixel is used as a planar light source and these are brought close to each other, so that the non-light emitting region existing between the pixels as in the conventional case is reduced and the display area is displayed. Uniform light emission can be obtained as a whole, and as a result, even if the number of light emitting diodes used is reduced, a uniform and high-quality display device with less dot feeling can be realized. In addition, the hexagonal columnar shape provides sufficient strength and has the advantage of not losing its shape even when a large number of pixel units are stacked.

It is a top view which shows the display device which concerns on Embodiment 1 of this invention. It is a perspective view of the pixel unit which constitutes a display device. It is an exploded perspective view which looked at the pixel unit from the front side. It is an exploded perspective view which looked at the pixel unit from the back side. FIG. 5 is an exploded perspective view showing a state in which the display device of FIG. 1 is configured by stacking the pixel units of FIG. 2. It is a schematic plan view which shows the region which arranges an LED on the bottom surface of a reflection structure. It is a perspective view which shows the surface mount type LED. It is a schematic plan view which shows the LED aggregate which formed one pixel by arranging two red LEDs and one green LED and one blue LED respectively. It is a schematic cross-sectional view which shows the viewing angle of the SMD type LED. It is a schematic cross-sectional view which shows the viewing angle of a cannonball type LED. FIG. 11A is a plan view of a pixel unit using an SMD type LED, and FIG. 11B is a schematic cross-sectional view showing a light distribution curve of the LED in the XB-XB line of FIG. 11A. It is a perspective view which shows the reflection structure of a regular hexagonal column. It is a schematic plan view which shows the light distribution of LED in a pixel light emitting region. It is an image figure which shows the pixel light emitting area which turned on LED by the pixel unit which does not provide the side surface. It is a graph which shows the relative emission intensity of the LED in the XV-XV line of FIG. 16A is a plan view of a pixel unit using a bullet-shaped LED, and FIG. 16B is a schematic cross-sectional view showing a light distribution curve of the LED in the XIB-XIB line of FIG. 16A. It is a schematic plan view which shows the pixel pitch. It is a schematic plan view which shows the display area which arranged the point-shaped pixel in a matrix. It is a schematic plan view which shows the display area which arranged the square-shaped pixels in a matrix. It is a schematic side view which shows the intensity distribution of light when the LED is separated from the reflector and is made to emit light. It is a schematic plan view which shows a square-shaped pixel. It is a schematic plan view which shows the hexagonal pixel. It is a vertical cross-sectional view which shows the inside of the hexagonal pixel unit. It is a schematic plan view which shows the display area which arranged the hexagonal pixel. It is a schematic plan view which shows the display area in which dot-shaped pixels are offset for each row. It is a schematic side view which shows the dispersion of the weight when the hexagonal columnar pixel unit is laminated. It is a schematic cross-sectional view which shows the surface light emitting light source using a light guide plate. It is a schematic cross-sectional view which shows the surface light emitting light source using a diffusing lens. It is an enlarged sectional view of a diffusion sheet. It is an enlarged sectional view of the diffusion sheet which concerns on a modification. It is a schematic cross-sectional view which shows the diffusion and reflection of light by a reflector and a diffuser. It is a schematic cross-sectional view which shows how the LED is arranged inside the reflection structure. It is a photograph which shows the state which made the pixel unit which made the thickness of a reflector different, emit light. It is a photograph which shows the state which made the pixel unit which made the thickness of a reflector different, emit light. It is an image figure which shows the pixel light emitting area which turned on LED by the pixel unit provided on the side surface. It is sectional drawing which shows the pixel unit which concerns on a modification. It is a perspective view which shows an example of the LED unit. It is an exploded perspective view which shows the state which fixed the LED unit to a reflective structure. It is a perspective view which looked at the state which fixed the LED unit to a reflection structure from the back side. It is a block diagram which shows the drive circuit which lights and drives each pixel unit. It is a block diagram which shows the display device which has a communication function. FIG. 42A is a perspective view showing a connecting mechanism according to a modified example, and FIG. 42B is a perspective view showing a connecting mechanism according to another modified example. FIG. 43A is a perspective view showing a folded state of the foldable pixel unit, and FIG. 43B is a perspective view showing an unfolded state. 44A is a perspective view of FIG. 43A as viewed from the back surface, and FIG. 44B is a perspective view of FIG. 43B as viewed from the back surface. It is a developed view of a foldable pixel unit. FIG. 46A is an exploded perspective view of the reflective structure having a double structure, FIG. 46B is an exploded perspective view showing a state in which the lid frame is further covered on FIG. 46A, and FIG. 46C is an exploded view of the pixel unit covered with the lid frame from the state of FIG. 46B. It is a perspective view which shows the perspective view. FIG. 47A is a front view showing a state in which a plurality of foldable outer layers are connected and folded, and FIG. 47B is a front view showing an unfolded state. FIG. 48A is a front view showing a folded state of a pixel unit group in which a plurality of foldable pixel units are connected, and FIG. 48B is a front view showing an expanded state of the pixel unit group. It is a front view which shows the back board. It is a front view which shows the state which arranged the pixel unit in the lower part of the back board of FIG. It is a front view which shows the state which arranged the pixel unit in the 2nd stage of the back board of FIG. It is a front view which shows the display device which concerns on the modification. It is an exploded perspective view which shows the frameless pixel unit. It is an exploded perspective view which shows the display device which connected a plurality of pixel units. It is a photograph taken from the front of the state in which the pixel unit according to Example 1 and Comparative Example 1 was made to emit light. It is a top view which shows the LED panel of P20. It is a top view which shows the display device which concerns on Example 1. FIG. It is a graph which compared the power consumption of the display device which concerns on Example 1 and Comparative Example 1. It is a photograph taken at an angle of 45 ° from the front of the pixel unit which concerns on Example 1. FIG. It is a photograph taken at an angle of 60 ° from the front of the pixel unit which concerns on Example 1. FIG. FIG. 61A is a schematic plan view showing an example in which characters are expressed by combining pixel units, and FIG. 61B is a schematic plan view showing an example in which a figure is displayed. It is an exploded perspective view of the display device which concerns on Embodiment 2 of this invention. It is a top view which shows the display device which concerns on Embodiment 2 of this invention. It is an exploded perspective view which shows the pixel module which connected a plurality of pixel units. It is an exploded perspective view which shows the display device which connected a plurality of pixel modules.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below exemplify a display device for embodying the technical idea of the present invention, and the present invention does not specify the display device as the following. Further, the present specification does not specify the members shown in the claims as the members of the embodiment. In particular, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present invention to the specific description, and are merely explanatory examples. It's just that. The size and positional relationship of the members shown in each drawing may be exaggerated to clarify the explanation. Further, in the following description, members having the same or the same quality are shown with the same name and reference numeral, and detailed description thereof will be omitted as appropriate. Further, each element constituting the present invention may be configured such that a plurality of elements are composed of the same member and the plurality of elements are combined with one member, or conversely, the function of one member is performed by the plurality of members. It can also be shared and realized.
(Embodiment 1)

Hereinafter, the display device 1000 according to the first embodiment of the present invention is shown in the plan view of FIG. 1, and the perspective view of the pixel unit 100 constituting the display device 1000 is shown in FIG. As shown in these figures, a plurality of pixel units 100 are stacked to form a display device 1000. Each pixel unit 100 is provided with a connecting mechanism 40 for connecting the pixel units 100 to each other. By making the pixel unit constituting one pixel of the display device a unit type in this way, it is possible to construct a display device of an arbitrary size by changing the number of vertically and horizontally connected pixel units.
(Pixel unit 100)

A perspective view of the pixel unit 100 is shown in FIG. 2, an exploded perspective view seen from the front side, that is, the light emitting region side is shown in FIG. 3, and an exploded perspective view seen from the back side is shown in FIG. 4, respectively. The pixel unit 100 shown in these figures includes a reflection structure 10, a diffusion sheet 20, and a light emitting diode (LED) 50.

The reflective structure 10 has a hexagonal columnar outer shape, a hollow inside, and an open end on one side.

The diffusion sheet 20 is a translucent member arranged so as to close the open end of the reflective structure 10. The diffusion sheet 20 constitutes a pixel light emitting region.

The LED 50 is a light emitting diode capable of emitting red, green, and blue, which is arranged in the central portion of the other edge of the reflective structure 10 and is located in the central portion of the edge.

A plurality of pixel units 100 are laminated, and the hexagonal columnar side surfaces of each pixel unit 100 are laminated as shown in FIG. 5, and the pixel light emitting regions composed of the diffusion sheet 20 on the top surface are adjacent to each other to display a large display. It constitutes an area. With this configuration, the light from the point light source of the LED 50 is spread in a plane shape by the diffusion sheet 20, and the surface light emitting region composed of the diffusion sheet 20 is adjacent to each other. The problem that the display surface is uneven due to light emission can be solved. That is, even if the distance between the LEDs is widened, each pixel is used as a planar light source and these are brought close to each other, so that the non-light emitting area existing between the pixels as in the conventional case is reduced and the entire display area is displayed. As a result, even if the number of LEDs used is reduced, a uniform and high-quality display device with less dot feeling can be realized. Further, since the pixel unit 100 has a hexagonal columnar shape, it has an advantage that it has sufficient strength and does not lose its shape even when a large number of pixel units 100 are stacked.
(Reflective structure 10)

As shown in the exploded perspective view of FIG. 3, the reflective structure 10 has a hexagonal columnar outer shape, and the diffusion sheet 20 is arranged on the front side. The pixel unit 100 is formed in a bottomed tubular shape with the front side of the reflective structure 10 open, a lid frame 30 is inserted at the open end, and a diffusion sheet 20 is placed between the lid frame 30 and the reflective structure 10. It is configured to be sandwiched. The bottom surface of the lid frame 30 is opened to form an opening window, and the diffusion sheet 20 is exposed from this opening window. The diffusion sheet 20 has substantially the same size as the edge of the reflective structure 10 and is slightly smaller than the inner diameter of the lid frame 30. The lid frame 30 is formed in a frame shape that covers the hexagonal outer circumference of the diffusion sheet 20.

Further, the other end edge, that is, the bottom of the reflective structure 10 is closed by the bottom plate. An opening OP is formed in the central portion of the bottom plate, and the LED 50 is inserted into the reflection structure 10 from the opening OP.

The inside of the reflective structure 10 is made of a color or material having excellent reflectivity. For example, by making the inner surface white, the reflectance inside the reflective structure 10 can be easily increased. The reflective structure 10 is preferably made of paper. As a result, the display device can be configured inexpensively and lightweight. In particular, if the display device is installed indoors, water resistance and weather resistance are not required, and paper can be sufficiently used. The paper may be recycled paper, which makes it suitable for a recycled society with a reduced environmental load. In addition to paper, wood, polypropylene, plastic, etc. can be used to reduce weight and reduce costs. It may also be made of a lightweight metal such as aluminum. Further, the reflective structure 10 is provided with a connecting mechanism 40 for connecting a plurality of pixel units 100 to each other (details will be described later).

The side surface of the reflective structure 10 is preferably square. As a result, the light of the LED 50 arranged in the reflection structure 10 can be diffused inside the reflection structure 10 and appear on the diffusion sheet 20 as a planar light source with less shadow and less unevenness. In the examples of FIGS. 2 and 3, the side surface is a 95 mm square. The advantage of having a square shape will be described later.

Further, FIG. 6 shows a plan view of the bottom surface forming the edge of the reflective structure 10. As shown in this figure, the LED 50 is arranged in the central portion of the bottom surface of the hexagonal shape. This central portion is the inside of the hexagonal shape surrounded by 42% points on the line segment from the center of the bottom surface of the hexagonal columnar surface of the reflective structure 10 to each vertex. By doing so, by locating the LED 50 at the center of the hexagon, it is possible to uniformly emit light in the pixel light emitting region. The detailed advantages of such an arrangement will be described later.
(LED50)

The LED 50 uses a surface mount type (SMD) or a bullet type. In particular, the surface mount type has a wide light distribution range and is suitable for diffusing. Preferably, as shown in the perspective view of FIG. 7, a multi-dice in which a red LED chip, a green LED chip, and a blue LED chip are incorporated in one package, or a type of LED 50M called 3in1 or the like is used. By combining the emission colors of RGB in this way, full-color display including white is possible by mixing colors. However, it is not always necessary to incorporate a plurality of chips into one package, and red LEDs, green LEDs, and blue LEDs composed of individual packages can be used side by side. Alternatively, either two LEDs are incorporated into a common package, and the other LEDs are combined into individual packages, or an arbitrary color, for example, as shown in FIG. 8, only two red LEDs are used to form one pixel. You may. In particular, when an LED having a lower brightness than other colors is used, it is preferable to combine a plurality of LEDs so that the emission brightness of the LEDs of each color becomes uniform. It goes without saying that the fact that these LEDs can be combined is applicable to both SMD and bullet type. Further, a plurality of SMDs and bullet-shaped LEDs can be used according to the required specifications such as the amount of light. For example, three, six, and nine SMD type LEDs can be used side by side in one pixel unit.

The half angle indicating the light distribution of the LED 50 is preferably 100 ° to 150 °. By doing so, the position where the peak of the light distribution of the LED 50 becomes the peak is positioned so as to be substantially in the center of the height of the pixel unit 100, so that the pixel light emitting region can be made to emit light uniformly. ..

FIG. 9 shows an example of the viewing angle of the SMD type LED50S, and FIG. 10 shows an example of the viewing angle of the bullet type LED50H. As described above, the SMD type LED generally has a wider viewing angle than the bullet type LED, and is therefore suitable as a planar light source.

FIG. 11B shows the internal light distribution curve of the reflection structure 10 in which the multicolor SMD type LED 50 capable of emitting RGB is arranged in the pixel unit 100 shown in the plan view of FIG. 11A. Here, the XB-XB line when the LED 50 is arranged at the O point at the center of the bottom surface of a regular hexagon having one side x [mm] and a long side 2x [mm] of the pixel unit 100 shown in the plan view of FIG. 11A. It shows the light distribution characteristics seen from the cross section in. Considering the light distribution on the S-plane in FIG. 11A, that is, the plane composed of lines connecting adjacent points by skipping one apex of the hexagon, the height is the side surface of the hexagonal column as shown in FIG. 11B. When is a square, it becomes x [mm].

At point a, which is the midpoint in the height direction, the height is x / 2 [mm]. The light from the LED 50 arranged at the O point on the bottom surface toward the a point passes through the a point and goes straight to reach the b'point, that is, the corner of the hexagonal column. If reflection occurs at point a virtually, it will be directed toward point b at the center of the top surface of the hexagonal column. As shown in FIG. 11B, the incident angle at point a is 45 °. From this, it is considered that the height d of the hexagonal column needs to be x (= x / 2 + x / 2) or more. However, the higher the hexagonal column, the more the distance d between the LED 50 and the top surface, which is the pixel light emitting area, is x or more. , It is not preferable because color unevenness occurs in the central part. On the other hand, if the height d of the hexagonal column is shorter than x, the central portion will be overexposed. Therefore, from the viewpoint of reducing the uneven brightness while ensuring the brightness, the height of the reflective structure 10 is x, that is, the side surface of the hexagonal column is square, so that the uneven brightness is suppressed while ensuring the brightness. A pixel unit is constructed. As described above, it is proved that the side surface of the reflective structure 10 is preferably square. The S plane is a virtual plane given as an index of LED selection, and reflection does not actually occur.

The half angle of this SMD type LED is about 120 °. In this case, when the light emitted from the LED 50 at 60 ° is reflected on the wall surface inside the hexagonal column reflection structure 10, the reflected light does not reach the point b, which is the center of the top surface, and is reflected around the point b. Will be done. As a result, the reflected light is irradiated not near the center of the top surface where the light originally directly emitted from the LED 50 gathers, but as a result, only the center of the top surface, which is the pixel light emitting region, becomes bright. By adjusting the situation in which the uneven brightness occurs so that the reflected light is applied to the peripheral portion, the effect of alleviating the uneven brightness and achieving uniformity can be obtained. With such a design, it is possible to uniformly irradiate the pixel light emitting region on the top surface with the light from the LED 50 arranged in the center of the bottom surface of the hexagonal column.

As shown in FIG. 12, when a regular hexagonal columnar reflection structure having the same height as the side surface is used, as shown in FIG. 11A, a relative luminous intensity of 70% or more can be obtained in the vicinity of an incident angle of 45 °. It is preferable to sort the LEDs. In other words, as shown in FIG. 13, the light distribution in the plan view of the LED used is designed so that the relative luminous intensity at the apex is 70% or more with respect to the center of the hexagonal pixel light emitting region. By using a wide-angle LED having a half-angle of 120 ° or 150 °, it can be realized by showing a relative luminous intensity of 70% or more at an incident angle of 45 °. The relative luminous intensity can be measured with a light distribution measuring device or the like.

When the light emitting surface is viewed from above, the LED is arranged in the center of the regular hexagon so that the hexagon is inscribed in a circle indicating the light distribution of the LED. Further, it is desirable that the LED shows a light distribution close to that of a point light source. At this time, when a plurality of light emitting elements (dies) such as red, blue, and green are mounted on one LED package, the light distribution distribution differs depending on the height and arrangement of each light emitting element, and the colors are red, green, and blue. It is not easy to inscribe everything completely inscribed in the hexagonal apex. As an example, in the SMD type LED of the multi-die package called 3in1 type, the state of the pixel light emitting region when only the red LED is made to emit light at the maximum brightness is shown in FIG. Graphs showing the light emission intensity are shown in FIG. 15, respectively. Here, an acrylic plate having a thickness of 1 mm is used as the reflector 22, and one side of the side surface of the reflector 10 is 95 mm. Further, in the graph of FIG. 15, the relative emission intensity normalized by the maximum value (pixel value) of the emission intensity of the red LED is shown. As shown in this figure, the peak of the relative emission intensity is shown not at the point O which is the center of the pixel emission region but at the point O'shifted to the left by 8.25 mm from the center O. It is considered that this is because the light emitting elements are arranged in the order of red, green, and blue inside the SMD type LED of the multi-dice package. Therefore, it is preferable to set the relative emission intensity to be 70% or more at the apex of the hexagonal shape.

Next, the light distribution characteristics when a bullet-shaped LED is used instead of the SMD type will be examined based on FIGS. 16A and 16B. Here, a pixel unit 100B capable of full-color display by mixing colors using three bullet-shaped LEDs having different emission colors, a red LED 50R, a blue LED 50B, and a green LED 50G, will be examined. First, as shown in the plan view of FIG. 16A, the red LED 50R, the blue LED 50B, and the green LED 50G are arranged in this order along the center of the bottom surface of the hexagon (indicated by the alternate long and short dash line in the figure). Here, as shown in FIG. 16B, the blue LED50B is located at the center O point on the bottom surface, and the red LED50R and the green LED50G are located on the S'plane indicated by the alternate long and short dash line, and on the intersection of the S plane and the center line, respectively. Be placed. Here, assuming that each bullet-shaped LED has a half-angle of about 60 ° and has a light distribution curve as shown in FIG. 16B, the region (direct color mixing area) where the RBG LED is mixed with the direct light is indicated by an arrow. Only the area indicated by. In other words, color unevenness is likely to occur in other areas. In addition, uneven brightness naturally occurs. In particular, the light of the red LED 50R and the green LED 50G arranged on both sides is reflected by the wall surface inside the reflective structure 10, and the light of the blue LED 50B in the center is also irradiated only in the range of 60 °. It becomes difficult for light to irradiate the corners of the top surface of the pillar.

Therefore, by using a bullet-shaped LED provided with a wide-angle lens, for example, the half-angle can be set to 120 ° or the like, and the same handling as the SMD type can be achieved. Further, the red LED 50R, the blue LED 50B and the green LED 50G may be arranged centrally in the central portion. In this example, the red LED 50R and the green LED 50G are arranged inside the S surface to narrow the distance from the blue LED 50B. As a result, it is possible to expand the direct color mixing area in which the colors are mixed by the direct light of the RBG LED. Further, if the direct light from the red LED 50R and the green LED 50G arranged on both sides is set so as to reach the corner of the top surface, the decrease in brightness can be suppressed. In other words, it is preferable to design the height of the reflection structure so that the corners of the top surface, which is the pixel light emitting region, can be directly irradiated with light according to the half angle of the LEDs arranged on the outer edge. ..

Here, considering that many bullet-shaped LEDs have a half-angle of about 60 °, if the position where the LED with a half-angle of 60 ° is arranged is calculated, the position R where the red LED 50R is arranged is the position R like the pixel unit. , When the height is x [mm], the position is x / √3 from the left end according to the three-square theorem. Since the distance from the left end to the center O point on the bottom surface is x [mm], the distance from the center O point to R is x [mm] −x / √3 [mm]. Therefore, if the ratio is calculated from the center O point to R, it becomes (xx / √3) ÷ x, and 1-1 / √3≈0.42. Therefore, as shown in the schematic plan view of FIG. 6, by arranging the LEDs within a range of 42% from the center of the bottom surface of the hexagonal columnar pixel unit having a square side surface, a pixel light emitting region with less unevenness can be obtained. Is possible.

By forming each LED in close proximity to each other to form an LED aggregate in this way, heat can be easily concentrated and heat dissipation becomes an issue. However, according to the present embodiment, the periphery of the LED aggregate is a large space. Become. Further, by connecting the pixel units to each other, the distance between the adjacent LED aggregates becomes wider. As described above, according to the present embodiment, since the pixel pitch can be made large, the distance between the LED aggregates can be widened, heat dissipation from this region is promoted, and sufficient heat dissipation can be exhibited. .. In addition, by ensuring heat dissipation performance, it is not necessary to add a separate member for heat dissipation such as a heat sink, which contributes to weight reduction, miniaturization, and cost reduction. As shown in FIG. 17, the pixel pitch is represented by x√3, where x is one side of a regular hexagon.

The number of LEDs used in the display device is determined by the display area (display area), that is, the width (w) and height (h), the pixel pitch (pp), and the number of LEDs constituting one pixel. As for the number of LEDs, for example, as shown in the perspective view of FIG. 7 described above, if the LED50M is a type in which a red LED chip, a green LED chip, and a blue LED chip are incorporated in one package, one LED is one pixel. Color display is possible even if it is placed in. Alternatively, if it is a bullet-shaped LED, a red LED, a green LED, and a blue LED may be arranged in close proximity to each other. In this case, it is necessary to arrange at least three types of LEDs in one pixel. Alternatively, a plurality of LEDs having the same emission color may be combined, and for example, as shown in FIG. 8, two red LEDs 50R, one green LED 50G, and one blue LED 50B may be arranged. These are designed according to the output of the LED used. Further, as for the method of arranging the plurality of LEDs, in addition to arranging them in a straight line such as a horizontal row or a vertical row, they may be arranged in a matrix as shown in FIG. Further, by bringing the LEDs having different emission colors close to each other, it is possible to enhance the color mixing of the emitted light. On the other hand, in consideration of heat dissipation, it is also preferable to add a heat dissipation mechanism to the LED. As a result, stable light emission performance can be maintained for a long period of time. In this way, one pixel is composed of an LED aggregate composed of a plurality of LEDs.

In order to reduce the number of LEDs used in the display device, as shown in FIG. 18, it is necessary to widen the distance between the LEDs 50 constituting the pixels, that is, the pitch. In this case, as a result of the light emitting portion being point-shaped in the display region, the contrast difference from the region other than the non-light emitting point becomes remarkable, and the display device has a strong dot feeling in which only the light emitting portion is conspicuous. In order to avoid this, it is conceivable to make the light source planar rather than point-like and to make the non-emission region between pixels as small as possible. For example, consider changing one pixel from a dot-shaped pixel as shown in FIG. 18 to a square-shaped pixel 52 as shown in FIG. In order to convert the point light source of the LED into a planar light source, as shown in the schematic side view of FIG. 20, a reflective material 60 (for example, a transparent milky white material such as acrylic, polycarbonate, vinyl chloride, etc.) which is a pixel light emitting region is used. It is conceivable to prepare a plate material) and arrange the LED 50 away from the reflector 60. In this case, when the irradiation light of the LED 50 is applied to the reflector 60, as shown in FIG. 21, the light is concentrated in the center of the quadrangular pixel, and conversely, the amount of light is relatively small in the four corners surrounded by the broken line. As a result, uneven brightness and uneven color occur.

Therefore, in the present embodiment, the reflective structure of the pixel unit has a hexagonal columnar shape, and the pixel display area on the inner front side of the bottom surface thereof has a hexagonal shape. With this configuration, as shown in FIG. 22, the decrease in the amount of light in the peripheral portion of the hexagonal shape, which is the pixel display region, particularly the portion of the apex surrounded by the broken line is reduced, and color unevenness is suppressed. As described above, although the light is not uniformly irradiated at the four corners when the pixel display area is square, the hexagonal shape makes it possible to uniformly irradiate the corners. Further, by making the reflection structure of the pixel unit a hexagonal columnar, as shown in the vertical cross-sectional view of FIG. 23, light is reflected more on the side surface than the structure such as a cube inside, and the upper layer portion in the pixel That is, the effect of filling the pixel display area with light can be obtained.

Here, the reason why it is preferable to configure the pixel with a hexagonal planar light source will be described. As shown in FIG. 24, the pixel unit 100 having a hexagonal shape in a plan view performs tessellation in which a finite variety of plane figures (tiles) are spread without gaps in the plane. Circles are most preferable to follow the radiation of a point light source, but the circles cannot be tessellated with each other, resulting in dead space. Therefore, as a regular tessellation type, when examining the shape of a tile that can be tessellated with one type, there are an equilateral triangle, a square, and a regular hexagon.

Of these, a hexagonal shape is most preferable for the display device. That is, from the state in which the display area is composed of the point light sources arranged in a matrix as shown in FIG. 18, an arrangement example of the point light sources in which each row is arranged in an offset shape is examined as shown in FIG. In this state, by dividing each pixel into a hexagonal shape as shown in FIG. 24, a display area composed of pixels of a planar light source as shown in FIG. 1 can be configured.

Further, when configuring an LED display, it is necessary to stack a large number of pixel units 100, but by making the pixel units 100 hexagonal columnar, a plane-filled honeycomb structure in which the side surfaces are stacked is formed, and as shown in FIG. 26, the upper part is formed. Since the load from the honeycomb can be dispersed, sufficient strength can be maintained without losing its shape. That is, the weight of the pixel material can be reduced.

Next, the existing surface emission technology will be described. The most common configuration for surface emission is a light guide plate (Light Guiding Panel: LGP) as shown in the cross-sectional view of FIG. 27. Here, the light incident from the side surface is reflected in the light guide plate LG. In the example of FIG. 27, the diffuser 60', the light guide plate LG, and the reflector 60 are laminated. Further, a dot pattern is formed on the panel surface of the light guide plate LG by laser processing. In this configuration, the LED 50 needs to be arranged on the side surface (face-to-face or outer circumference) of the light guide plate LG. That is, dozens of LEDs are required around the light guide plate LG that overlaps one panel of the display area, and it is inevitable that the power consumption will increase.

On the other hand, as shown in the cross-sectional view of FIG. 28, a configuration using a diffuser lens DL is also conceivable. Here, the light is diffused by a lens arranged apart from the front surface of the LED, which is a point light source, and converted into a planar light source. In the example of FIG. 28, the diffuser plate 60 ”is arranged on the upper surface of the lens. In this configuration, the optical design of the diffuser lens DL is required for each panel. There was a problem that the design cost would rise due to the need to change the design and layout.

On the other hand, in the display device 1000 according to the first embodiment, the pixel unit 100 has a hexagonal columnar honeycomb structure. Further, the reflector 22 and the diffusion film 24 are laminated to form the diffusion sheet 20. By connecting the pixel units 100 in a unit manner in this way, the pixel size can be made variable. Further, by using a planar light source, the number of LEDs can be reduced, and power consumption can be reduced.

In particular, as shown in the cross-sectional view of FIG. 23, the reflection structure 10 is filled with light to convert it into uniform light. Further, as shown in the enlarged cross-sectional view of FIG. 29, the light emitted from the irradiation surface is diffused by the diffusion layer and transmitted through the reflection layer, so that the intensity of the light can be made uniform. As a result, it is possible to reduce the occurrence of color unevenness in the corners of each pixel, particularly in the vicinity of the vertices.
(Diffusion sheet 20)

Further, a diffusion sheet 20 constituting a pixel display area is arranged at the open end of one end of the hexagonal columnar shape of the reflective structure 10. The diffusion sheet 20 is composed of a reflector 22. The reflector 22 is made of a hard resin plate, and a diffuser is dispersed inside. By doing so, the light received from the LED 50 is scattered inside the diffusion sheet 20, and more uniform surface emission can be obtained. Further, when the inside of the reflective structure 10 is viewed from the outside through the diffusion sheet 20, the effect of making the LED 50 invisible can be obtained. In particular, by making the LED 50 invisible when the LED 50 is lit, a high-quality planar light source with reduced dot feeling can be obtained. Therefore, it is preferable that the reflector 22 has a milky white translucent color.

For such a reflector 22, an acrylic plate, polycarbonate, polypropylene, vinyl chloride resin, PET resin, or the like can be preferably used. The thickness of the reflector 22 is preferably 1 mm to 2 mm. Here, the acrylic material IR-432 manufactured by Acrysandy Co., Ltd. is used. The light transmittance of the reflector 22 is 58%, the reflectance is 43%, and the diffusivity is 84% when the characteristics are evaluated based on the thickness of 3 mm. Further, according to the test conducted by the present inventors, regardless of the thickness of the acrylic plate of 1 mm, 1.5 mm, or 2.0 mm, it is a milky white and translucent acrylic material, and the total light transmittance is 55% or more. It was confirmed that if it is about 70%, the LED cannot be visually recognized at the time of lighting and can be suitably used. As described above, the color of the reflector 22 is preferably milky white and translucent.
(Diffusion film 24)

Further, the diffusion sheet 20 may be formed by combining the reflection plate 22 with the diffusion film 24. The diffusing film 24 is a resin film sheet coated with a diffusing material, and is used by being laminated on the surface of the reflector 22. A polyester film can be preferably used for such a diffusion film 24. The thickness of the diffusion film 24 is set according to the thickness of the LED light source and the acrylic plate, and is preferably 38 μm to 125 μm. Here, a polyester film having a thickness of 38 μm manufactured by Tochiman technical paper co. Ltd was used. Further, the diffusion film 24 may be made of paper as well as made of resin. Further, when the reflector and the diffusion film are composed of one sheet, or the thickness can be made thinner.

As shown in FIG. 29, by locating the diffusion film 24 on the surface side of the pixel unit, the reflection of ambient light by the reflector 22 can be suppressed, and the effect of blindfolding the LED 50 becomes difficult to see from the outside can be obtained. Be done. However, the stacking order of the diffusion film 24 and the reflector 22 is not limited to the above, and the reflector 22 may be arranged on the diffusion film 24 in reverse as shown in FIG. As a result, an advantage that color development is improved can be obtained as compared with the case where the diffusion film 24 is arranged on the reflector 22.

In the example of FIG. 3, a milky white transparent acrylic plate 1 mm is used as the reflector 22, and a polyester film 38 μmm is used as the diffusion film 24. These reflectors 22 and the diffusion film 24 are adhered to each other and brought into close contact with each other. As a result, as shown in the cross-sectional view of FIG. 31, the light collected in the upper layer portion inside the reflective structure 10 is diffusely reflected in the diffuser, and the intensity of the light on the pixel surface can be made uniform.

With this configuration, the LED does not need a lens or the like to diffuse light, and it is sufficient to arrange the LED in the center of the pixel as shown in the schematic cross-sectional view of FIG. 32. In other words, since the optical design of the lens and the like becomes unnecessary, the manufacturing cost can be suppressed at low cost. In this way, uniform light intensity can be obtained in the pixel display region. Further, by adjusting the amount of light emitted from the LED, it is possible to express the gradation of the pixels, and the image quality of the LED display can be improved.

Here, the results of the test in which the thickness of the reflector is changed are shown in FIGS. 33 and 34. The pixel unit used in these figures has a thickness of 2 mm on the left side of the reflector of the acrylic plate and a thickness of 1 mm on the right side, and the pixel display area is photographed in a state where the LED is made to emit light. No diffusion film is used. Further, FIGS. 33 and 34 show the same pixel unit, FIG. 33 shows a state of taking a picture from the 1 mm side diagonally to the right of the front of the pixel display area, and FIG. 34 shows a state of taking a picture from the 2 mm side diagonally to the left of the front. Indicates the state. As shown in these figures, it can be seen that the LED light source can be visually recognized in FIG. 33, while the LED light source cannot be confirmed in FIG. 34.

As described above, in the reflector having a thick thickness of 2 mm, the LED of the light source is not visible even without the diffusion film, and the uneven brightness can be suppressed. However, as much as it is made thicker, it becomes darker as a whole as compared with the example of 1 mm thickness. On the other hand, with a 1 mm thick reflector, the LED of the light source can be visually recognized at the time of lighting, although it is brighter. Therefore, it can be said that it is more preferable to combine the diffusion film 24 with the 1 mm thick reflector.

Further, FIGS. 35 and 14 show examples of comparing how the surface light emitting state changes depending on the presence or absence of the side surface of the reflective structure. In these figures, FIG. 35 shows a hexagonal columnar reflective structure provided with a side surface, and FIG. 14 shows a state in which the LED is emitted in a reflective structure in which the side surface is removed and only the lid frame 30 is formed. As is clear from these figures, in the configuration having no side surface, the pixel light emitting region is dark as a whole, the central portion is bright, and the light emitting surface is non-uniform, which becomes darker toward the periphery. On the other hand, it was confirmed that by using the side surface as a reflecting surface, it is possible to make the pixel light emitting region bright as a whole and uniformly emit light over the surroundings.
(Lens body 65)

The present invention is not necessarily limited to a configuration that does not require a lens, and a lens can be appropriately adopted as needed. For example, when a plurality of LEDs 50 are provided in the reflection structure 10 in order to increase the amount of light as in the pixel unit 100F according to the modification shown in FIG. 36, the lens body 65 covers the plurality of LEDs 50 and each of them is covered. It is possible to condense the light emitted by the LED 50 and adjust the light to be surface-emitted by the diffusion sheet. Especially in the case of pixel units and display devices used indoors, a certain amount of light is required so that the surface emission of LEDs can be clearly expressed even under indoor lighting such as fluorescent lamps, and only as the number of LEDs used increases. , The distribution of the LED light became non-uniform, and the region with a high amount of light may be overexposed. On the other hand, according to the above modification, the LED light can be uniformly collected and dispersed by using the lens body 65, and a high-quality surface-emitting light source can be obtained. The lens body 65 is used in the sense of including both a configuration that has a function of condensing LED light and a configuration that has a function of dispersing LED light.
(LED unit 55)

Further, the LED provided with the lens body 65 is preferably in the form of a unit. Such an example is shown in the perspective view of FIG. 37 as a modified example. The LED unit 55 shown in this figure has an LED chip 50C, a mounting plate 53 for mounting the LED chips 50C, a lens body 65 for sealing the mounting plate 53, and a tubular shape extended to the back side of the mounting plate 53. It has a body 56.

The size and number of the LED chips 50C are selected according to the required specifications such as the amount of light and the rating. In order to increase the amount of light, it is preferable to mount a plurality of them. In the example of FIG. 37, six surface mount (SMD) type LED chips 50C are mounted in an annular shape. However, the present invention does not limit the number of LED chips and the arrangement pattern to this example, and may be any number such as 3 or 8 LED chips. Further, the arrangement pattern of the LED chips can also be arranged in a rectangular shape or a linear shape.

As the mounting plate 53, a glass epoxy substrate, a ceramic substrate, or the like can be used. Preferably, the LED chip 50C is mounted on the front surface side of the mounting plate 53, and the drive circuit and the protection circuit are mounted on the back surface side. Further, it is preferable that the back surface side is sealed with a sealing resin such as a silicone resin.

The lens body 65 covers the periphery of the plurality of LED chips 50C. The lens body 65 is formed in a dome shape with a translucent resin such as colorless and transparent or milky white transparent. The lens body 65 is optically designed so as to uniformly collect and disperse the light emitted by the plurality of LEDs on the surface of the diffusion sheet. Further, although the inside of the lens body 65 is hollow, the present invention is not limited to this configuration, and for example, the LED chip may be sealed with the lens body.
(Cylindrical body 56)

Further, a tubular body 56 is provided on the back surface side of the lens body 65. The tubular body 56 is formed in a cylindrical shape, and the inner surface thereof communicates with the back surface side of the mounting plate 53. As described above, various circuits and electronic components mounted on the back surface side of the mounting plate 53 are made of a sealing resin. It is sealed. Further, a connection harness 57, which is an electric signal line for connecting to a drive circuit or the like, is pulled out from the tubular body 56 to the outside. The connection harness 57 includes a connector 58 at the tip thereof. When a plurality of LED units 55 are used, they can be connected in a communicable state by connecting the connectors 58 of the connection harness 57 of each LED unit 55 to each other in a daisy chain.

Further, the tubular body 56 has a thread groove formed on a side surface thereof, and can be screwed by being inserted into a screw hole having a thread groove on the inner surface such as a ring body 90 or a bolt of another member. Further, a collar portion 59 is provided at the boundary between the tubular body 56 and the lens body 65. The flange portion 59 has a larger outer diameter than the tubular body 56, and serves as a stopper that defines the screwing position of the ring body 90 when the ring body 90 is screwed.

Here, an example of fixing the LED unit 55 to the reflection structure 10 using the ring body 90 will be described with reference to the exploded perspective view of FIG. 38. First, a circular opening OP is opened in advance on the bottom surface 11 of the reflective structure 10. The size of the opening OP is such that the tubular body 56 of the LED unit 55 can be inserted and the flange portion 59 cannot pass through. In other words, the diameter of the opening OP is larger than the outer diameter of the tubular body 56 and smaller than the outer diameter of the flange portion 59.

As shown in the perspective view of FIG. 39, the connection harness 57 is passed through the opening OP from the front side to the back side, and the tubular body 56 is exposed on the back side of the reflective structure 10. The ring body 90 is screwed into the tubular body 56 from the back surface side. As a result, the LED unit 55 can be fixed to the pixel unit while the bottom surface 11 of the reflective structure 10 is sandwiched between the ring body 90 and the collar portion 59. With this method, the LED unit 55 can be fixed to the reflective structure 10 extremely easily without the need for a tool such as a screwdriver.
(Drive circuit)

Each LED 50 is lit and driven by a drive circuit. FIG. 40 shows a block diagram of a drive circuit for lighting and driving each pixel unit 100. As shown in this figure, the LED 50 of each light emitting unit is connected to the controller 70. The controller 70 receives information such as still images, moving images, and texts to be displayed in the display area, which is input from an external image source or preset, and emits light in response to the information. The position and emission color are determined, and the necessary pixels are controlled. For example, the amount of drive current of the red LED, the green LED, and the blue LED is adjusted so as to emit light with a desired brightness and chromaticity. Further, the controller 70 receives electric power from an external power source and supplies necessary driving electric power to the LED 50 of each pixel unit 100. For example, in the examples of FIGS. 59 to 60 described later, the emission color of the display device is automatically displayed so that the 360 ° hue circulates.

In the example of FIG. 40, the drive circuit for lighting and driving each pixel unit 100 is configured and controlled by a common controller 70, but a drive circuit may be provided for each pixel unit.

Alternatively, as shown in the modified example of FIG. 41, a communication circuit 72 for wireless communication with an external device may be added to the controller. The communication circuit 72 is a member that enables the lighting of the LED to be controlled by wireless operation from an external device. Radio waves, microwaves, optical communications, and the like can be used as the wireless connection method for the communication circuit 72 to accept wireless operations from an external device. In the case of radio waves, short-range wireless, wireless PAN, wireless LAN, etc. can be used. In particular, standardized wireless communication such as WiFi, Bluetooth, ZigBee, 6LoWPAN, and Sub-1GHz (all are trade names) enables low-cost implementation and introduction. In particular, it is preferable to use a communication method that supports low power consumption such as Bluetooth Low Energy (BLE). In addition, by using a device in which an application is installed on a smartphone as an external device, it is possible to easily wirelessly operate the LED lighting from the outside. Further, in addition to using a standardized method such as general DMX as a control signal for LED lighting, a dedicated control signal can also be used.

In addition, for communication with the external device, in addition to operating the lighting of the LED, it is also possible to configure the external device to receive information distribution from the display device. For example, the display device may be used as a monitor of a game device, and an external device may be configured to be operable as a controller. For example, it can be used for Othello games, Minesweeper (both are product names), and the like.

Alternatively, the display device can also be used for advertising POP and the like. In this case, it is also possible to distribute information using a beacon technology such as iOS iBeacon (registered trademark) or Android OS Eddystone. For example, while displaying characters and videos on a display device, when a user with a smartphone with a dedicated application approaches, the URL of the product introduction homepage and coupons can be automatically distributed. Further, the user who uses the coupon may be made to perform a display operation such as displaying a dedicated privilege video.

Further, the connection between each pixel unit 100 and the controller 70 may be a parallel connection as shown in FIG. 40, or may be a daisy chain system in which beads are connected as shown in FIG. 41. In particular, the daisy chain method is preferable because by connecting a large number of pixel units in series, the number of connected pixels is not limited and the number of connected pixels can be easily changed.
(Connecting mechanism 40)

A connecting mechanism 40 for connecting to another reflective structure 10 is provided on the side surface of the reflective structure 10. In the example of FIG. 2 and the like, the hook-and-loop fastener is fixed to the side edge of the hexagonal columnar reflective structure 10 as the connecting mechanism 40. For example, one of the hook and the loop constituting the hook-and-loop fastener is provided on one of the opposite sides of the side surface, and one of the hook and the loop is provided on the other of the opposite sides of the side surface. If the pixel units are laminated, the hooks and loops are combined on the opposing surfaces of the reflective structure 10, so that they can be easily connected. Further, in the example of FIG. 2 and the like, the hook-and-loop fastener is provided in the height direction of the hexagonal columnar reflective structure 10, that is, along the side connecting the vertices of the bottom surfaces on both sides. However, the present invention is not limited to this configuration, and for example, surface fasteners may be provided along the sides orthogonal to these, that is, each side constituting the bottom surface. In this case, hooks and loops are alternately arranged between the hook-and-loop fasteners adjacent to each other in the length direction to facilitate the connection. Further, the hook-and-loop fasteners do not necessarily have to be provided on all the sides of the side surface of the reflective structure, and may be provided only at the corners or may be evenly arranged at regular intervals along the sides.

Further, the connecting mechanism 40 is not limited to the hook-and-loop fastener, and a known detachable mechanism such as a mechanical fitting mechanism or an engaging mechanism can be appropriately used. FIG. 42A shows a perspective view of the pixel unit 100D provided with the connecting mechanism 40B according to the modified example. In this example, a hook-shaped hard connecting hook that is bent into an L-shape in cross section is provided, and the L-shapes can be engaged with each other and locked. Further, a hook is used in the connection mechanism 40C of the pixel unit 100E according to another modification shown in FIG. 42B.

In this way, the pixel units can be connected to each other by the connecting mechanism 40 to construct a large display device. Further, since the pixel units can be connected in a unit type, the size of the display area of the display device can be adjusted by adjusting the number of connections. However, the structure is not necessarily limited to the detachable structure by the connecting mechanism, and the reflective structures may be fixed to each other with double-sided tape or an adhesive.

When connecting a plurality of pixel units in this way, stable holding can be achieved by supporting each pixel unit with the back board described above. In particular, when the bottom surface of the pixel unit is divided and automatically assembled at the time of assembly as shown in FIGS. 43 to 45 described later, the machine is compared with the case where the bottom surface is composed of one sheet. Since the strength is lowered, when a large number of pixel units are stacked, the lower pixel units are more likely to concentrate the load. Therefore, by using the back board 18, it is possible to reduce the concentration of such a load and reinforce it.

Further, as shown in FIG. 49 and the like, the back board 18 does not necessarily have a shape in which the back opening BO is opened, and for example, a flat plate-shaped back board without an opening is configured depending on the mode of the pixel unit to be used. You may.
(Folding structure)

Further, each pixel unit may have a foldable structure. By folding the reflective structure into a plate shape, the bulky member can be made compact, which is advantageous for transportation and storage. In particular, when a large number of reflective structures are used, transportation at low cost and the like can be realized. Such an example is shown in FIGS. 43A to 45. In these figures, FIG. 43A is a folded state of the foldable pixel unit, FIG. 43B is a perspective view showing an unfolded state, FIG. 44A is a perspective view of FIG. 43A viewed from the back, and FIG. 44B is a view of FIG. 43B from the back. A perspective view and FIG. 45 show a developed view of a foldable pixel unit. In the pixel unit shown in these figures, the reflective structure 10B is foldable with the diffusion sheet removed. Here, the lid frame 30 for holding the diffusion sheet is removable, and the hexagonal columnar reflective structure 10B from which the lid frame 30 is removed is foldable. The bottom plate of the reflective structure 10B is divided into a plurality of bottom plate pieces 14. As shown in the developed view of FIG. 45, each side surface 13 of the hexagonal column of the reflective structure 10B is continuous with the bottom plate piece 14, and each bottom plate piece 14 is separated from each other. As shown in FIGS. 43A and 44A, the bottom plate piece 14 is folded so that each of the reflective structure 10B is in contact with the side surface 13 when the reflective structure 10B is in a folded state, and is in a flat folded state. On the other hand, as shown in FIGS. 43B and 44B, when the reflective structure 10B is assembled, that is, in the unfolded state, the bottom plate pieces 14 are engaged with each other to form an integral bottom plate.

At this time, it is preferable to form each bottom plate piece 14 in advance so that a circular opening OP is formed in the central portion of the bottom plate. As a result, as shown in FIG. 38 and the like, the tubular body 56 of the LED unit 55 can be inserted into the opening OP and screwed and fixed by the ring body 90. With this configuration, since the ring body 90 and the flange portion 59 can sandwich and fix the periphery of the opening OP, the bottom plate formed by combining the plurality of bottom plate pieces 14 can be integrally held. In other words, the screwing of the ring body 90 and the tubular body 56 can play a function of fixing the LED unit 55 to the reflective structure 10B and also a function of holding the foldable reflective structure 10B in the unfolded state.
(Multi-layer structure)

Further, the pixel unit may have a multi-layer structure. For example, the reflective structure constituting the hexagonal columnar structure is a double structure in which two layers are stacked. Such an example is shown in FIGS. 46A to 46C. In these figures, FIG. 46A is an exploded perspective view of the reflective structure 10C having a double structure, FIG. 46B is an exploded perspective view showing a state in which the lid frame 30C is further covered with FIG. 46A, and FIG. 46C is a lid frame from the state of FIG. 46B. The perspective view which shows the exploded perspective view of the pixel unit covered with 30C is shown respectively. The reflective structure 10C shown in these figures is composed of a hollow hexagonal columnar outer layer 15 and an inner layer 16 which is inserted into the inner surface of the outer layer 15 and is one size smaller than the outer layer 15. The inner layer 16 is formed to have a height slightly higher than that of the outer layer 15, and is configured such that a part of the inner layer 16 protrudes in a state where the inner layer 16 is inserted into the outer layer 15. In this state, if the lid frame 30C is covered so as to close the opening end, the lid frame 30C and the reflective structure 10C can be substantially flush with each other on the side surface of the pixel unit as shown in FIG. 46C. In particular, when the lid frame 30C and the reflective structure 10C are made of paper, the lid frame 30C and the reflective structure 10C are made of the same thickness of paper, and the step at the boundary between the lid frame 30C and the reflective structure 10C is formed. Can be eliminated and the appearance can be improved. Further, the above-mentioned bottom plate piece 14 can be formed on the inner layer 16 side.
(Multiple unit connection function)

Further, when a plurality of pixel units are connected to form a large display device, such a display device can be obtained by stacking a group of pixel units in which a plurality of pixel units are connected. At this time, if the reflective structure having a two-layer structure is used, the pixel units can be easily connected to each other. That is, as shown in FIGS. 47A to 47B, an outer layer group 15G in which hollow hexagonal columnar outer layers 15 are connected in advance is prepared, and the inner layer 16 is inserted into each outer layer 15 of the outer layer group 15G. .. It is preferable that the inner layer 16 is inserted into the outer layer group 15G in advance. As a result, as shown in FIGS. 48A to 48B, by changing the reflective structure 10C from the folded state to the unfolded state, it becomes possible to assemble a plurality of pixel units at the same time, and workability is improved. In the examples of FIGS. 47A to 48B, an example of a pixel unit group 100G in which three pixel units are connected in the horizontal direction is shown, but the number of connected pixel units is not limited to this, and two or four are connected. It can also be the above.

Further, an example in which such a group of pixel units is stacked to form a display device will be described with reference to FIGS. 49 to 51. First, the back board 18 as shown in FIG. 49 is prepared. The back board 18 is a paper pattern showing the shape of the pixel units after they are connected, and each pixel unit is arranged on the pattern. A back opening BO is formed at the arrangement position of the pixel unit. By using such a back board 18, it is possible to reduce the concentration of the load applied when the pixel units are laminated. In particular, when a large number of pixel units are stacked, the load is concentrated on the lowest pixel unit, but by fixing each pixel unit to the back board, the stress can be dispersed and the load can be reduced.

Next, as shown in FIG. 50, the pixel unit group is arranged at the bottom of the back board 18. Here, the two-layer structure reflective structure group 10G shown in FIG. 48B is stacked on the back board 18 so that each opening OP coincides with the back opening BO of the back board 18, and each opening is in this state. The LED unit 55 is fixed to the part OP. Each LED unit 55 inserts the tubular body 56 from the light emitting surface side of the reflective structure 10C, projects it from the back surface of the back board 18, and screws the ring body 90 into the thread groove of the tubular body 56 to fix it. In this way, each LED unit 55 is fixed in the lowermost pixel unit group, and each reflection structure 10C is further held in the expanded state. In this state, the open end of each reflective structure 10C is covered with a lid frame 30C to close the opening.

Next, as shown in FIG. 51, another reflection structure group 10G'is arranged above the bottom pixel unit group 100G, that is, in the second row from the bottom. Hereinafter, the LED units 55 are fixed in the same manner, and the LED units 55 are closed by the lid frame 30C. In this way, the pixel unit of each row can be fixed, and finally a display device can be obtained.

Further, in a display device in which a plurality of hexagonal columnar pixel units are stacked, when the lowermost stage is hexagonal columnar as shown in FIG. 1, the contact area is small when placed on a flat surface, and the display device is lightweight. It may be unstable. Therefore, as shown in FIG. 49 described above, the lowermost stage of the back board 18 is made linear, or the pentagonal columnar pixel unit 100H is arranged only in the lowermost stage as in the display device 3000 according to the modified example shown in FIG. 52. You may. With this configuration, the bottom surface of the display device can be made planar and more stable.
(Frameless pixel unit)

Furthermore, in the above-mentioned example, since the diffusion sheet is held by using the lid frame, the frame shape of each pixel unit can be visually recognized. Therefore, in order to make such a frame shape thinner, the diffusion sheet may be directly attached to the open end of the reflective structure without using the lid frame of another member. An example of this is shown in FIG. In this example, the diffusion sheet 20D formed in a hexagonal shape at the opening end is prepared in advance, and an adhesive is applied to the opening end of the reflective structure 10D and attached. However, with this configuration, the positioning work of the diffusion sheet 20D becomes troublesome. Therefore, as shown in the perspective view of FIG. 54, one large diffusion sheet 20E may be attached in a state where a plurality of pixel units are connected in advance. In this case, a common diffusion sheet is attached to the open end of each reflection structure in a state where the plurality of pixel units are packed and arranged so that there is almost no gap. With this method, the labor of positioning is reduced. Further, by cutting the unnecessary portion of the diffusion sheet 20E as needed after the diffusion sheet 20E is attached, the labor of the positioning work can be further saved.

Alternatively, the shape of the diffusion sheet is not limited to a rectangular shape, and it can be cut in advance into a shape according to the connection form of the pixel unit. For example, as shown in FIG. 64, a diffusion sheet 20F formed in advance according to the form in which the reflective structure 10D is connected is prepared, and the reflective structure 10D is attached to the open end in a laminated state. For example, an adhesive is applied to the edge of each open end to bond them.

It is also possible to configure a pixel module in which a plurality of pixel units are connected, and further combine the plurality of pixel modules to form a larger image display device. For example, an aggregate in which 3 horizontal × 4 vertical pixel units shown in FIG. 64 are connected is regarded as one pixel module 100I, and by combining a plurality of these, a display device having a larger number of pixel units can be constructed. For example, in the example shown in FIG. 65, a plurality of display devices of FIG. 64 are prepared as pixel modules 100I, and by connecting these pixel modules 100I in two horizontal × two vertical, the number of pixel units is 6 horizontal × 6 It constitutes eight large vertical display devices 4000. The number of pixel units is preferably an even number so that the pixel modules 100I can be easily connected to each other. Further, for connecting the pixel modules to each other, for example, one back board formed in advance on the outer shape of the display device 4000 after the connection can be prepared, and the back side of each pixel module 100I can be fixed.
(Example 1)

Here, in order to show the usefulness of the present invention, the pixel unit according to the first embodiment is created, and as a comparative example, a pixel unit having a quadrangular display area is created, and LEDs are emitted with the same emission color and brightness, respectively. It was taken from the front with the LED. The result is shown in FIG. 55. Here, the side surface of the pixel unit is a square with a side of 7 cm. The pixel pitch was set to about 12 cm. As shown in this figure, it was confirmed that the color tone and brightness of the surface of the hexagonal shape according to Example 1 were appropriately adjusted. On the other hand, in the quadrangular shape according to the comparative example, uneven brightness and uneven color were observed depending on the portion, and the point-shaped light source of the LED was so strong that it could be visually recognized near the center, and overexposure was remarkable. As described above, in this example, it was confirmed that the color mixing was uniform and the brightness was also uniformly obtained in the entire pixel emission region.
(Display size)

Generally, when the display size is increased and the resolution is increased, the power consumption is increased and the installation location is extremely limited. Therefore, there is a trade-off relationship between display size and power consumption. Therefore, in the display device according to the present embodiment, even if the display size is increased, the number of LEDs used is reduced to avoid an increase in power consumption. In this method, the pitch between the LEDs constituting the pixels becomes long, so that the resolution is lowered. Generally, in an LED display, the ^{power consumption per 1 m 2} is used as an index. For example, as shown in FIG. 56, in a commercially available LED panel called P20 or the like with a pitch of 20 mm, 1000/20 = 50 per 1 m, so the number of LEDs per ^{1 m 2 is 50 x 50 = 2500.} Is. On the other hand, in the first embodiment shown in FIG. 57, as described above, the hexagonal pixel unit has a side of 9.5 cm and a pixel pitch of about 12 cm (P120), which is 1000 ÷ 120 = 8.33. 8x8 = 64 pieces. As shown in the graph of FIG. 58, the power consumption when LEDs having the same rating are used is reduced to about 1/40 in Example 1 as compared with Comparative Example 1. Therefore, a large display can be used even with a 100 V commercial power supply for general household use. For example, a large display having a maximum power consumption of 1500 W and a maximum of about 13 mx 6 m can be configured.

Further, when comparing the power ^{consumption, when comparing the power consumption converted to 1 m 2} , the amount of LEDs used in a commercially available LED panel having a pixel pitch of about 20 mm (P20) is 2500 pieces / m ^2. The power consumption is 1000 w / m ² . On the other hand, since the drive voltage / current of the 3in1 type SMD type LED used in the embodiment has a rated value of 5V / 60mA, the power consumption per one is 5V × 60mA = 0.3W. When this LED is arranged in a regular hexagonal reflective structure 10 having a side of 9.5 cm, it corresponds to about 64 (8 x 8), so its power consumption is 0.3 W x 64 = 19.2 W / It becomes m ^{2. It can be seen that this pixel unit can reduce the current consumption to 1000 w / m 2} ÷ 19.2 ^{w / m 2} ≈ 52.08, which is about 1/52, as compared with the LED panel of P20. Further, even with a general household power supply, ^{a display of about 78 m 2} (1500 W / 19.2 W) at 1500 W and a maximum of about 13 mx 6 m can be configured. Compared with the case where the display is configured by using the bullet-shaped wide-angle LED of the same standard with the LED panel of P20, the power consumption can be reduced by about 1/39 (64/2500).

Further, there is an advantage that the display area, that is, the display shape can be freely arranged. The shape of a conventional general display is limited to a quadrangle because the basic module in which a plurality of LEDs are arranged in a matrix is a quadrangle or a rectangle. On the other hand, in this embodiment, one pixel is used as the basic module and the shape is a hexagonal pixel unit, so that more flexible arrangement and layout are possible. That is, by combining such pixel units, it is possible to arrange them in a plane, a curved surface, and in a free space, and it is possible to propose a flexible display size and shape according to the installation location.
(Viewing distance and angle)

Further, since many existing LED displays use light directly emitted from the LED (direct light), it is difficult to view the display from a short distance or from a side surface. On the other hand, in this embodiment, since the LED light is diffused by the pixel unit and then visually recognized without using the direct light of the LED, it is possible to visually recognize from a short distance regardless of the viewing distance, and further, the side surface. It is possible to watch from. Here, in order to confirm the viewing angle of the pixel unit according to the first embodiment, a photograph taken at an angle of 45 ° from the front of the pixel unit with the LED emitted in green is shown in FIG. 59, also at 60 °. A photograph taken from an angle is shown in FIG. It was confirmed that all of them could be visually recognized in a mixed color state, and according to this embodiment, it was shown that the visibility from the side surface was also good. It is also possible to propose new effects that make use of the honeycomb structure. For example, it is possible to draw characters and figures as shown in FIGS. 61A and 61B.

Further, in a general LED display, since a large number of LEDs are integrated in a panel module, a large aluminum heat sink, a metal chassis, or the like is used to efficiently dissipate heat generated by the LEDs, and heat is dissipated. Heat dissipation measures such as installing a fan are required. On the other hand, according to this embodiment, by unitizing each pixel, the pitch between pixels is widened, and as a result of reducing the amount of LED used per unit area, the amount of heat radiation can be reduced, so that heat is dissipated. No special mechanism for this can be required. As a result, the configuration can be simplified, the weight can be reduced, and the manufacturing cost can be reduced.
(Embodiment 2)

In the above example, an example in which a large number of pixel units are connected to form a display device has been described. However, the present invention is not limited to this configuration, and the display device can be integrally configured. Such an example is shown in the exploded perspective view of FIG. 62 and the plan view of FIG. 63. In the display device 2000 shown in these figures, a hexagonal opening window 82 is formed in a metal frame 80 using a laser processing machine, and a diffusion sheet 20 is arranged in each opening window 82. The diffusion sheet 20 may be formed in advance to the size of the display area, and may be laminated on the frame 80 on which the opening window 82 is formed. A casing 12 is arranged on the back surface of the diffusion sheet 20. The casing 12 is partitioned into hollow hexagonal columns, that is, honeycombs, at positions and sizes corresponding to the opening windows 82. Further, on the back side of the casing 12, an LED mounting board 54 in which the LED 50 is arranged at a position corresponding to each opening window 82 is arranged. In this way, it is also possible to configure the display device by designing the casing 12, the frame body 80, and the LED mounting board 54 in advance to the size of the desired display area. Further, in this way, a plurality of display devices using a large number of LEDs 50 as a planar light source for each pixel can be connected to form a large display device having a larger display area.

According to the display device and the pixel unit of the present invention, it can be suitably used as a display for displaying characters and images on a large screen, intelligent lighting, and the like.

1000, 2000, 3000, 4000 ... Display device 100, 100B, 100D, 100E, 100F ... Pixel unit 100G ... Pixel unit group 100H ... Pixel columnar pixel unit 100I ... Pixel module 10, 10B, 10C, 10D ... Reflective structure 10G 10, 10G'... Reflective structure group 11 ... Bottom surface 12 ... Casing 13 ... Side surface 14 ... Bottom plate piece 15 ... Outer layer; 15G ... Outer layer group 16 ... Inner layer 18 ... Back board 20, 20D, 20E, 20F ... Diffusion sheet 22 ... Reflector plate 24 ... Diffusion film 30, 30C ... Lid frame 40, 40B, 40C ... Connecting mechanism 50 ... Light emitting diode (LED); 50C ... LED chip 50R ... Red LED; 50G ... Green LED; 50B ... Blue LED
50M ... Multi-dice LED; 50S ... SMD type LED; 50H ... Cannonball type LED
52 ... Square pixel 53 ... Mounting plate 54 ... LED mounting board 55 ... LED unit 56 ... Cylindrical body 57 ... Connecting harness 58 ... Connector 59 ... Flange 60 ... Reflective material 60'... Diffusing material; 60 "... Diffuse Plate 65 ... Lens body 70 ... Controller 72 ... Communication circuit 80 ... Frame body 82 ... Opening window 90 ... Ring body OP ... Opening BO ... Back opening LG ... Light guide plate DL ... Diffusing lens

Claims (27)

A display device in which a plurality of pixels are arranged at regular intervals.
Profile and a hexagonal prism which is composed of a bottom plate and side, a reflecting structure one as a whole cavity was open end of the inner face of the side face of the hexagonal prism,
A translucent diffusion sheet arranged at the open end of one end of the hexagonal columnar structure of the reflective structure, and
In the bottom plate is the other end edge of the reflective structure, arranged in the center portion of the bottom plate, the red, green, and capable of emitting light-emitting diodes in the blue,
Consists of
The central portion of the bottom plate and the peripheral portion in contact with the side surface of the hexagonal columnar are defined as a region in which the light emitting diode is not arranged.
A plurality of pixel units in which the light emitted by the light emitting diode arranged in the central portion of the bottom plate is reflected by the inner surface of the hexagonal columnar side surface are laminated, and the hexagonal columnar side surfaces of each pixel unit are laminated. A display device that constitutes a display area by adjoining pixel light emitting areas composed of a diffusion sheet on the top surface. The display device according to claim 1, further
The drive circuit that drives the light emitting diode and
A communication circuit for enabling the drive circuit to be controlled by a wireless connection from an external device,
A display device comprising. The display device according to claim 1 or 2.
A display device in which the side surfaces of the reflective structure are square. The display device according to any one of claims 1 to 3.
A display device in which the diffusion sheet has a thickness of 38 μm to 125 μm. The display device according to any one of claims 1 to 4.
A display device in which the diffusion sheet is made of a resin-made hard plate and is made of a translucent reflector. The display device according to claim 5.
A display device in which the total light transmittance of the reflector is 55% to 70%. The display device according to claim 5 or 6.
A display device comprising a resin diffusing film coated with a diffusing material, wherein the diffusing sheet is laminated on the surface of the reflector. The display device according to claim 7.
A display device in which the diffusion film is laminated on the reflector so as to be located on the surface side of the pixel unit. The display device according to any one of claims 1 to 8.
In addition to having a plurality of the light emitting diodes
A display device including a lens body that covers the plurality of light emitting diodes. The display device according to any one of claims 1 to 9.
A display device in which an opening is formed in a central portion of the bottom plate, and the light emitting diode is inserted into the reflection structure through the opening. The display device according to claim 10.
The light emitting diode
A cylindrical tubular body that can be inserted into the opening,
A collar formed adjacent to the tubular body and larger than the opening,
Is equipped with
The tubular body forms a thread groove and has a thread groove.
The display device further comprises an annular ring body that can be screwed into the thread groove.
With the tubular body of the light emitting diode inserted into the opening from the light emitting surface side of the reflective structure, the ring body is inserted into the thread groove of the tubular body protruding from the back surface side of the reflective structure. Is screwed in, and the light emitting diode is fixed to the reflection structure. A display device in which a plurality of pixels are arranged at regular intervals.
A reflective structure with a hexagonal columnar outer shape, a hollow inside, and one open end to reflect on the inner surface.
A translucent diffusion sheet arranged at the open end of one end of the hexagonal columnar structure of the reflective structure, and
At the other edge of the reflective structure, a light emitting diode that is located in the center of the edge and is capable of emitting red, green, or blue.
A plurality of pixel units composed of are laminated with each other on the hexagonal columnar side surfaces of each pixel unit, and the pixel light emitting areas composed of the diffusion sheet on the top surface are adjacent to each other to form a display area.
The diffusion sheet can be attached to and detached from the reflective structure.
A display device having a structure in which the reflective structure can be folded while the diffusion sheet is detached from the reflective structure. The display device according to claim 12.
The bottom plate of the reflective structure is divided into a plurality of bottom plate pieces so as to be continuous with each side surface of the hexagonal column.
When the reflective structure is folded, each bottom plate piece is separated.
When the reflective structure is in the expanded state, the bottom plate pieces are engaged with each other to form an integral bottom plate, and a circular opening is formed in the central portion of the bottom plate.
The light emitting diode
A tubular body that can be inserted into the opening
A flange portion formed adjacent to the tubular body and having an outer diameter larger than the inner diameter of the opening.
Is equipped with
The tubular body forms a thread groove and has a thread groove.
The display device further comprises an annular ring body that can be screwed into the thread groove.
With the tubular body of the light emitting diode inserted into the opening from the light emitting surface side of the reflective structure, the ring body is inserted into the thread groove of the tubular body protruding from the back surface side of the reflective structure. Is screwed in, and the light emitting diode is fixed to the reflection structure. The display device according to any one of claims 1 to 13.
A display device in which the central portion is inside a hexagonal shape surrounded by 42% points on a line segment from the center of the hexagonal columnar bottom plate of the reflection structure to each apex. The display device according to any one of claims 1 to 14.
A display device in which the light distribution of the light emitting diode is 100 ° to 150 °. The display device according to any one of claims 1 to 15.
A display device having a relative luminous intensity of 70% or more at a corner of the pixel emitting region with respect to the center of the pixel emitting region. The display device according to any one of claims 1 to 16.
A display device in which the light emitting diode is a light emitting diode in which a red LED chip, a green LED chip, and a blue LED chip are incorporated in one package. The display device according to any one of claims 1 to 16.
A display device in which the light emitting diode is an aggregate of LEDs in which a red light emitting diode, a green light emitting diode, and a blue light emitting diode are arranged in close proximity to each other. The display device according to any one of claims 1 to 18.
A display device provided with a connecting mechanism on the side surface of the reflective structure for connecting to another reflective structure. The display device according to any one of claims 1 to 19.
A display device in which the inside of the reflective structure is white. The display device according to any one of claims 1 to 20.
A display device in which the reflective structure is made of paper. The display device according to any one of claims 1 to 21, further
A display device including a lid frame that holds the diffusion sheet and closes the open end of the reflective structure. The display device according to claim 22.
The lid frame is a display device formed in a frame shape that covers the hexagonal outer circumference of the diffusion sheet. The display device according to any one of claims 1 to 21.
A display device in which the diffusion sheet is directly attached to the open end of the reflective structure. The display device according to any one of claims 1 to 24.
A display device in which a common diffusion sheet is attached to the open end of each reflective structure in a state where the plurality of pixel units are adjacent to each other. The display device according to any one of claims 1 to 25.
A display device in which the diffusion sheet contains paper. It is a pixel unit for forming one pixel of a display and combining a plurality of pixels to form a large display device.
Profile and a hexagonal prism which is composed of a bottom plate and side, a reflecting structure one as a whole cavity was open end of the inner face of the side face of the hexagonal prism,
A translucent diffusion sheet arranged at the open end of one end of the hexagonal columnar structure of the reflective structure, and
In the bottom plate is the other end edge of the reflective structure, arranged in the center portion of the bottom plate, the red, green, and capable of emitting light-emitting diodes in the blue,
Equipped with a,
The central portion of the bottom plate and the peripheral portion in contact with the side surface of the hexagonal columnar are defined as a region in which the light emitting diode is not arranged.
Pixel units light emitted is arranged light-emitting diode in the central portion, ing as to reflect on the inner surface side of the hexagonal column of the bottom plate.

Images