JP5276376B2 - Light distribution control panel and moving body mounted display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light distribution control panel which can suppress reflection on a glass surface of a mobile object in the case that the light distribution control panel is applied to a display device mounted to the mobile object, and the display device mounted to the mobile object for which the light distribution control panel is used. <P>SOLUTION: The light distribution control panel 1 is provided with a base body 7 of a plate-like or sheet-like substrate comprised of a light transmissive material wherein the base body 7 has a plurality of convex portions 2 that are formed at a side reverse to the side of a backlight 11 of the base body 7and used for the control of light distribution. The plurality of convex portions 2 are arranged to extend in parallel with one another. The light distribution control panel 1 is further provided with a light transmissive reflection suppressing unit (the front surface of the one side surface 6 having the degree of roughness higher than that of the front surface of the other side surface 5) that suppresses light incident from the front surface of the light source side of the base body 7 to project from at least a part (the one side surface 6) of the front surface of the convex portions 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a light distribution control panel and a moving body mounting display device, and more particularly to a light distribution control panel and a moving body mounting display device capable of controlling the light distribution of light.

Conventionally, a light distribution control panel for controlling the light distribution direction is known (see, for example, Japanese Patent Laid-Open No. 2000-193809 (hereinafter referred to as Patent Document 1)). Patent Document 1 discloses a sheet-like light distribution control panel made of a light-transmitting material for the purpose of efficiently directing light in a specific direction without impairing the light relaxation feeling. A light control means (for example, a prism whose cross-sectional shape is a linear protrusion) is formed for controlling light distribution by shape, and a second light control means (for example, a fine prism) having a finer shape is formed on one surface of the prism. And a diffraction grating or a diffusion surface) are disclosed. In patent document 1, it assumes that the said light distribution control panel is mainly used for an outdoor lighting fixture.
JP 2000-193809 A

  Here, in order to display various information in recent years, a display device has been mounted on a mobile body represented by an automobile. For example, a display device for a car navigation system of a car, a display device for presenting information related to driving a car to a driver, and the like can be given. These display devices are arranged, for example, on a dashboard on the front side of an automobile. At this time, the display content of the display device may be reflected on the windshield adjacent to the dashboard. Such reflection is not preferable because it also obstructs the driver's field of view. Thus, in order to suppress such reflection, it is conceivable to use the above-described light distribution control panel. However, Patent Document 1 discloses an example of a light distribution control panel that is assumed to be used mainly for outdoor lighting equipment. However, the preferable conditions and configuration of the light distribution control panel for suppressing the reflection on the glass surface of the display device mounted on the moving body as described above are not clarified.

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is reflected on the glass surface of the moving body when applied to a display device mounted on the moving body. The present invention is to provide a light distribution control panel capable of suppressing the confusion and a display device for mounting on a moving body using the light distribution control panel.

Light distribution control panel according to the invention comprises a plate-like or sheet-like base material made of a translucent material, that is used in the mobile body-mounted display device disposed at a portion adjacent to the glass surface in a mobile It is a light distribution control panel, and the substrate has a plurality of convex portions for light distribution control formed on one surface opposite to the light source side of the substrate. The plurality of convex portions are arranged so as to extend in parallel to each other. The light transmission suppression part which suppresses that the light which injected from the surface by the side of the light source of a base material radiate | emits from at least one part of the surface of a convex-shaped part is provided. The cross section of the convex portion in the direction perpendicular to the extending direction of the convex portion has a triangular shape. The light transmission suppressing unit is configured such that light is emitted from one side surface connected to one of the two corners located at the boundary with the surface of the substrate in the cross section in the convex portion. Suppress. The light transmission suppression unit is provided on the light source side surface so as to block at least a part of the optical path of the light emitted from one side surface of the light incident on the base material from the light source side surface when the light source side surface of the base material is flat. The light source side light absorption layer formed in the. When used in a mobile body mounting display device, the convex portion is formed to extend in the horizontal direction of the mobile body mounting display device, and one side surface of the convex portion is located on the glass surface side.

  In this way, in the direction perpendicular to the extending direction of the convex portion in the light distribution control panel, the light distribution of the light transmitted through and emitted from the light distribution control panel is controlled to be different on the left and right. be able to. For example, in the region on one corner side of the corners at both ends located at the boundary with the surface of the base material in the cross section in the direction perpendicular to the extending direction in the convex shape portion, the luminance (intensity of light) ) Is relatively low, and in the region on the other corner side of the convex portion, the light field (intensity) is reduced. It becomes possible to make the angle relatively small.

Further , since the convex portion can act as a prism, the angle of the corner located at the boundary with the surface of the base material in the cross section of the convex portion and the shape of the side surface connected to the corner are adjusted. Thus, it is possible to control the light distribution of light emitted from the surface (one surface opposite to the light source side of the substrate) on which the convex portion is formed in the light distribution control panel. And by suppressing the light emitted from the side surface connected to the one corner by the light transmission suppressing portion, the luminance of the light in the direction in which the light emitted from the side surface connected to the one corner is emitted can be reduced. Therefore, the viewing angle of the region that effectively becomes the low luminance region can be increased in the direction.

In the light distribution control panel, the light transmission suppressing unit may include at least a part of an optical path of light emitted from one side surface of light incident on the base material from the light source side surface when the light source side surface of the base material is flat. so as to block the, that contains the light source side light absorbing layer formed on light source side surface. In this case, at least a part of the light that should be incident on the one side surface can be absorbed by the light source side light absorption layer. For this reason, the brightness | luminance of the light in the direction in which the light radiate | emitted from the said one side surface is discharge | released can be reduced. As a result, the viewing angle of the region that effectively becomes the low luminance region in the direction can be increased.

Further, in the light distribution control panel, the light transmission suppression unit intersects with an optical path of light emitted from one side surface of light incident on the base material from the light source side surface when the light source side surface of the base material is flat. Further, a groove formed on the light source side surface may be included.

  In this case, at least a part of the light to be incident on the one side surface can be reflected or refracted on the side surface of the groove. For this reason, the brightness | luminance of the light in the direction in which the light radiate | emitted from the said one side surface is discharge | released can be reduced. As a result, the viewing angle of the region that effectively becomes the low luminance region in the direction can be increased.

  In the light distribution control panel, in the convex portion, the roughness of one side surface may be larger than the roughness of the other side surface connected to the other corner portion of the two corner portions. In this case, the light emitted from the one side surface can be scattered on the one side surface. For this reason, the brightness | luminance of the light in the direction in which the light radiate | emitted from the said one side surface is discharge | released can be reduced. As a result, the viewing angle of the region that effectively becomes the low luminance region in the direction can be increased.

  In the light distribution control panel, even if the ratio (A / B) between the roughness A of one side surface connected to one corner and the roughness B of the other side surface connected to the other corner is 3 or more and 3000 or less. Good. In this case, the light emitted from the one side surface can be more reliably scattered.

  The reason for determining the numerical range of the ratio (A / B) of the surface roughness A on the one side surface and the roughness B on the other side surface is the above-mentioned numerical range, so that the moving body to which the light distribution control panel is applied. When the display device for mounting is arranged in the vicinity of the glass surface of the moving body (for example, the glass surface of the driver's seat), by setting the one side surface side to the glass surface side, the light reaching the glass surface from the display device The amount of light can be suppressed. For this reason, the reflection of the display content on the glass surface can be sufficiently suppressed. The ratio (A / B) is preferably 50 or more and 1000 or less.

  In the light distribution control panel, the angle α of the other corner of the two corners is 5 ° or more and 40 ° or less, and the angle β of one corner is 60 ° or more and 90 ° or less. Also good. In this case, in the direction perpendicular to the extending direction of the convex portion in the light distribution control panel, the light distribution of the light transmitted through and emitted from the light distribution control panel is surely controlled so as to have different distributions on the left and right. Can do.

  In addition, the reason for determining the angle range of the angle α is that the display on the glass surface is performed when the light distribution control panel is applied to the display device for mounting a moving body as described above by setting the angle range as described above. The image of the device is not reflected, and the deterioration of the front luminance in the display device can be suppressed to an allowable range. The angle α is preferably 10 ° or more and 30 ° or less.

  In addition, the reason for determining the angle range of the angle β is that the light distribution control panel on the glass surface side is applied when the light distribution control panel is applied to the display device for moving body by setting the angle range as described above. The leakage of light can be suppressed to a sufficiently low level. The angle β is preferably 60 ° or more and 90 ° or less.

In the light distribution control panel, the refractive index of the base material may be 1.4 or more and 1.6 or less.
The reason why the refractive index of the base material is 1.4 or more and 1.6 or less is that such a refractive index material is usually a material that can be obtained at a low price, thereby suppressing an increase in the cost of the light distribution control panel. This is because it is effective. The refractive index of the substrate may be 1.4 or more and 1.5 or less.

  Further, the light transmittance of the light distribution control panel may be 70% or more. The reason why the light transmittance of the light distribution control panel is set to 70% or more is that, for example, when the light distribution control panel is applied to a display device, the light absorption rate in the light distribution control panel is kept low. That is, it is possible to suppress the output of the light source necessary for making the luminance on the display surface of the apparatus constant. For example, when the light distribution control panel is applied to a liquid crystal display device, if the light transmittance at the light distribution control panel is low, the output (brightness) of the backlight device is sufficient to ensure sufficient luminance of the display surface. The loss in the light distribution control panel needs to be as large as possible, but if the light transmittance of the light distribution control panel is increased as described above, the light loss in such a light distribution control panel is reduced. As a result, the luminance of the backlight can be reduced. As a result, since the power consumption of the liquid crystal display device (display device) can be reduced, a power-saving and efficient display device can be realized. The light transmittance may be 80% or more.

  In the light distribution control panel, the width of the convex portion in a direction perpendicular to the direction in which the convex portion extends may be 20 μm or more and 500 μm or less. The lower limit of the width may be 50 μm or more, and the upper limit of the width is preferably 100 μm or less. In this case, for example, assuming a case where the present invention is applied to a display device mounted on a moving body, the width (pitch) of the convex portion can be reduced below the resolution of the human eye, so that the light distribution control panel is transmitted. It is possible to suppress the human being from recognizing the presence of the convex portion and feeling uncomfortable with the display content displayed using the light. Further, if the width is set to 100 μm or less, humans hardly recognize the presence of the convex portion, and thus the above-described effects can be surely obtained.

  The reason why the lower limit of the pitch is set to 20 μm is to reduce the manufacturing cost and manufacturing time of the mold used for manufacturing the light distribution control panel to a reasonable range.

  The light distribution control panel is a light distribution control panel for a display device light source mounted on a moving body such as an automobile. Thus, when the light distribution control panel of the present invention is used as a light source of a display device mounted on a moving body, the effects of the present invention are particularly remarkable.

  The display device for mounting on a moving body according to the present invention includes a light source, the light distribution control panel, and a display unit. The light distribution control panel is disposed on the light source. The display unit is mounted on the light distribution control panel. In this way, the direction in which the light emitted from the display device is not desired to reach by adjusting the arrangement of the light distribution control panel (the extending direction of the convex portion) when mounted on the moving body. Can be a low luminance region. For this reason, the malfunction (for example, the reflection of the display image on a windshield) by the light radiate | emitted from a display apparatus can be reduced.

  The display device for mounting on a mobile body may be disposed at a position adjacent to the glass surface in the mobile body, and a direction perpendicular to the direction in which the convex portion extends is a direction toward the glass surface. It may be arranged. In this case, since the direction toward the glass surface can be a low-luminance region, reflection of the image of the display device on the glass surface can be suppressed.

  According to the present invention, it is possible to form a low luminance region in a specific viewing angle direction while suppressing a decrease in light intensity. The reflection of an image on a surface or the like can be effectively suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic perspective view showing Embodiment 1 of a light distribution control panel according to the present invention. FIG. 2 is a schematic side view of the light distribution control panel shown in FIG. FIG. 3 is a schematic diagram showing a display device using the light distribution control panel shown in FIGS. 1 and 2. FIG. 4 is a schematic view showing an automobile as an example of a moving body on which the display device shown in FIG. 3 is mounted. FIG. 5 is a schematic diagram showing a dashboard of the automobile shown in FIG. Hereinafter, with reference to FIGS. 1-5, the light distribution control panel by this invention, a display apparatus, and the motor vehicle as a mobile body carrying the said display apparatus are demonstrated.

  As shown in FIGS. 1 and 2, the light distribution control panel 1 according to the present invention includes a base body 7 made of a translucent resin and a plurality of convex portions 2 formed on the surface of the base body 7. . The plurality of convex portions 2 are formed so as to extend in parallel to each other. In addition, the some convex part 2 may be formed so that it may each extend linearly. And the cross section in the direction perpendicular | vertical with respect to the direction where the convex part 2 is extended has a triangular-shaped external shape, as shown in FIG. An angle at one corner 4 of one convex portion 2 is defined as an angle β. In addition, the angle of the other corner 3 located on the opposite side of the convex portion 2 from the one corner 4 is defined as an angle α. On the other hand, the side surface of the convex portion 2 positioned between the corner portion 4 and the apex angle is referred to as one side surface 6. The other side surface 5 of the convex portion 2 located between the other corner portion 3 and the apex angle is referred to as the other side surface 5. A distance between one corner 4 and the other corner 3 in one convex portion 2 is defined as a pitch P. Further, the thickness of the base body 7 is defined as a thickness T.

  Here, to summarize the characteristic configuration of the light distribution control panel 1 described above, the light distribution control panel 1 includes a base body 7 that is a plate-like or sheet-like base material made of a light-transmitting material. The base body 7 of the panel 1 has a plurality of convex portions 2 as convex portions for light distribution control formed on one surface of the base body 7 opposite to the light source (backlight 11) side. The plurality of convex portions 2 are arranged so as to extend in parallel to each other as shown in FIG. Based on the roughness of the light transmission / reflection suppression portion (the surface of the other side surface 5), which suppresses light incident from the light source side surface of the base body 7 from being emitted from at least a part (one side surface 6) of the surface of the convex portion 2. The surface of the one side surface 6 with increased roughness) is provided. That is, the light transmission / reflection suppression portion (the surface of the one side surface 6 whose roughness is higher than the roughness of the surface of the other side surface 5) is located at the boundary between the convex portion 2 and the surface of the base body 7. Suppressing the transmission or reflection of light from the side surface (one side surface 6) connected to one of the two corner portions (one corner portion 4 and the other corner portion 3). .

  The plurality of convex portions 2 have a triangular shape in cross section in a direction perpendicular to the extending direction of the convex portions 2. Here, the cross-sectional shape of the convex portion 2 may be a triangular shape as shown in FIG. 1, but at least one of the one side surface 6 and the other side surface 5 may have a curved surface portion. Even in such a case, since it has one corner portion 4, the other corner portion 3, and an apex angle, it is called a triangular shape. Here, the triangular shape means a cross-sectional shape in which three corners exist as described above in the cross section of the convex portion 2, and a curved surface portion, a concave portion, one of the side surface 6 and the other side surface 5, It does not matter even if it includes convex parts.

  The refractive index of the base body 7 is 1.4 or more and 1.6 or less. The light transmittance of the light distribution control panel 1 is 70% or more. In the convex portion 2, the angle α of the other corner portion 3, which is the other corner portion of the two corner portions located at the boundary portion with the surface of the base body 7 in the cross section, is 5 ° or more and 40 ° or less. The angle β of the one corner 4 which is one corner is not less than 60 ° and not more than 90 °. The ratio (A / B) of the roughness A of the one side 6 connected to the one corner 4 to the roughness B of the other side 5 connected to the other corner 3 of the surface of the convex part 2 is 3 or more and 3000 or less. is there.

  In this way, the light distribution (luminance distribution) of the light transmitted through and emitted from the light distribution control panel 1 in the direction perpendicular to the extending direction of the projections 2 in the light distribution control panel 1 will be described later. As shown in FIG. 3, the distribution can be controlled so that the left and right are different. Moreover, the fall of the intensity | strength of the light which permeate | transmits the light distribution control panel 1 can be suppressed from the structure which light-shields the light which goes to the area | region which should become a low-intensity area | region.

  In the light distribution control panel 1, the pitch P, which is the width of the convex portion 2 in the direction perpendicular to the direction in which the convex portion 2 extends, is 20 μm or more and 500 μm or less. The pitch P is preferably 100 μm or less. In this case, for example, assuming the case where the light distribution control panel 1 is applied to the display device 10 mounted on a moving body, as will be described later, the width (pitch P) of the projections 2 is made equal to or less than the resolution of the human eye. Therefore, it is possible to suppress the human being from recognizing the presence of the convex portion 2 and feeling discomfort in the displayed display content for the light transmitted through the light distribution control panel 1. Further, if the pitch P is set to 100 μm or less, humans hardly recognize the presence of the convex portion 2, so that the above-described effects can be surely obtained.

Next, the manufacturing method by the mold using the metal mold | die of the said light distribution control panel 1 is demonstrated below.
In the method for manufacturing the light distribution control panel 1, first, a mold in which a recess corresponding to the surface shape of the light distribution control panel 1 is formed is prepared. A resin thin film constituting the light distribution control panel 1 is set between the mold and the opposing surface plate. In this state, the resin thin film is heated. Thereafter, molding is performed by pressing the heated resin thin film so as to be sandwiched between the mold and the opposing surface plate. When the mold is removed after cooling, the light distribution control panel 1 shown in FIG. 1 and the like is obtained.

  For heating the resin thin film, for example, a method in which the resin thin film is sandwiched between the mold and the opposite surface plate and then heated, or a method in which only the resin thin film is heated in a non-contact state in advance is arbitrarily adopted. can do. Heating of the resin thin film can be done with a heater installed directly under the mold or the opposite surface plate, but a heating function has been introduced inside the mold and the opposite surface plate (inside the mold and the opposite surface plate). It is also possible to use a heating function by installing a heater or the like.

  In the heating of the resin thin film, an embodiment in which the heating is performed at a temperature higher than the resin flow start temperature is preferable. In this way, by heating the resin thin film to a temperature higher than the flow start temperature and then performing pressure processing to press the resin thin film with the mold and the opposing surface plate, utilizing the resin flow phenomenon, The shape of the recess formed on the surface of the mold can be transferred to the surface of the resin thin film. In this way, the light distribution control panel 1 according to the present invention can be manufactured.

  As the resin constituting the light distribution control panel 1, it is preferable to use a resin that melts in a relatively narrow temperature range and rapidly cures when cooled, since throughput is increased. Accordingly, polycarbonate, polyimide, polymethyl methacrylate, polyethersulfone, polysulfone, polyetherimide, and the like are preferable. The thickness of the resin thin film is not particularly limited, but is preferably 20 μm or more, and more preferably 100 μm or more.

  The mold used for forming the light distribution control panel 1 can be manufactured by any conventionally known method. For example, the mold can be manufactured by a method including a step of forming a resin mold by a mold, a step of forming a layer made of a metal material on the resin mold on the substrate by plating, and a step of removing the resin mold. .

  At this time, the parent mold used in the step of forming the resin mold by the mold can be manufactured by machining, for example. Specifically, for example, a thick NiP (nickel phosphorus) plating layer is formed on the base plate. And the surface of the said plating layer is cut with the cutting tool which has the front-end | tip shape corresponding to the surface shape (cross-sectional shape of the convex part 2) of the light distribution control panel 1. FIG. In this way, the parent mold can be formed. Here, a precise fine structure can be used as the parent mold. In this case, the child mold manufactured by the parent mold is also a fine microstructure. For this reason, the resin thin film can be finely molded with high dimensional accuracy. Moreover, since it molds with a metal mold | die, a molded object can be integrally molded with reproducibility. In addition, the surface roughness (Ra) of the molded body can be suppressed to 10 nm or less.

  A method for manufacturing a mold using the above-described mold will be specifically described below. First, a mold such as injection molding is performed using a mold having a convex portion (parent mold) to produce a resin mold having a concavo-convex shape portion. The resin mold material is polymethyl methacrylate, polypropylene, polycarbonate or the like. Next, after forming a conductive substrate so as to cover the top of the resin mold, the resin mold is polished or ground. By this polishing or grinding, the base portion of the resin mold is removed, and a pattern made of resin is formed on the surface of the conductive substrate. That is, a resin mold based on a conductive substrate is formed.

  Thereafter, electroforming is performed as a conductive substrate plating electrode, and a metal material layer is deposited on the resin mold. If necessary, the metal material layer is made to have a predetermined thickness by polishing or grinding, and then the resin mold is removed by wet etching or plasma ashing. As a result, a mold is obtained in which a metal material layer is formed in a predetermined pattern on the surface of the conductive substrate using the conductive substrate as a base. In this mold, since the conductive substrate is used as a base (base) of the mold, the electroforming time required for forming the base can be omitted. Further, since the pedestal is not formed by electroforming, there is little warpage of the mold due to internal stress.

  The mold described above can also be manufactured by another method. This will be specifically described below.

  First, molding is performed using a mold having a convex portion (parent mold) to manufacture a resin mold. Next, a metal material layer is formed on the resin mold by electroless plating. Thereafter, the mold is obtained by removing the resin mold by wet etching or plasma ashing.

  The light distribution control panel 1 shown in FIG. 1 and FIG. 2 is used by arranging the side on which the convex part 2 is formed on the side opposite to the side facing the backlight 11 as the light source part of the display device. More specifically, the light distribution control panel 1 is used in the display device 10 as shown in FIG. The structure of the display device 10 will be described with reference to FIG.

  As shown in FIG. 3, the display device 10 includes a backlight 11 as a light source, a display unit 12, and a light distribution control panel 1 disposed between the backlight 11 and the display unit 12. As shown in FIG. 2, the light distribution control panel 1 is arranged such that the convex portion 2 is located on the side opposite to the side facing the backlight 11 (that is, on the display unit 12 side). That is, the light distribution control panel 1 is disposed on the backlight 11, and the display unit 12 is mounted on the light distribution control panel 1.

  Here, the backlight 11 may have a configuration in which a diffusion plate and a luminance auxiliary film are disposed on the light distribution control panel 1 side. The display unit 12 can be an LCD unit, for example. The LCD unit includes, for example, a liquid crystal cell, a retardation plate disposed on each of the front and back surfaces of the liquid crystal cell, and a polarizing plate disposed on the outer peripheral surface of each retardation plate. The liquid crystal cell has a structure in which a thin film transistor and a liquid crystal for driving a liquid crystal are disposed between two glass substrates disposed so as to face each other with a spacer interposed therebetween. As the display unit 12, a unit having another configuration may be used as long as it transmits and uses the light from the backlight 11. Further, as a different arrangement of the light distribution control panel 1, the light distribution control panel 1 may be arranged on the display unit 12 (on the surface opposite to the surface (back surface) on the backlight 11 side in the display unit 12).

  With such a configuration, the shape of the convex portion 2 (see FIG. 2) of the light distribution control panel 1 (specifically, the angle α, the angle β, the pitch P, the surface roughness of the one side surface 6 and the other side surface 5) ) Is appropriately adjusted, the light intensity distribution in the direction intersecting the extending direction of the convex portion 2 can be controlled. For this reason, for example, the range of the low luminance regions 26 and 27 (values of angles θ1 and θ2) in which the ratio of the relative luminance to the luminance in the front of the display device 10 is a predetermined value (for example, 0.3 or less) is convex. It can be made different at both end sides in the direction intersecting the extending direction of the portion 2. Specifically, as shown in FIG. 3, the angle θ <b> 2 indicating the distribution range of the low luminance region 26 can be made larger than the angle θ <b> 1 indicating the distribution range of the other low luminance region 27. In FIG. 3, an area showing a luminance higher than the predetermined relative luminance value described above is shown as a luminance securing area 25.

  The display device 10 shown in FIG. 3 is a moving body-mounted display device mounted on an automobile 30 that is an example of a moving body, for example, as shown in FIGS. 4 and 5. With reference to FIG. 4 and FIG. 5, the vehicle 30 carrying the display device 10 according to the present invention shown in FIG. 3 will be described.

  With reference to FIGS. 4 and 5, in the automobile 30, a windshield 31 for the driver to confirm the front is disposed in front of the passenger compartment. A dashboard 33 is disposed under the windshield 31. The display device 10 is disposed in a portion of the dashboard 33 that faces the seat 32. Examples of the display device 10 include a display unit that displays driving-related information of a car such as a display unit of a car navigation system and a speedometer. And in the display apparatus 10 mounted in the motor vehicle 30, after arrange | positioning so that the convex part 2 of the light distribution control panel 1 may extend in a horizontal direction, the shape of the said convex part 2 is controlled, and a front The reflection of the display content of the display device 10 on the glass 31 can be suppressed. That is, as shown in FIG. 4, the display device 10 is disposed in a portion adjacent to the windshield 31 as a glass surface in an automobile 30 as a moving body, and the convex portion 2 of the light distribution control panel 1 constituting the display device 10. The display device 10 is arranged so that a direction perpendicular to the extending direction (see FIG. 2) is a direction toward the windshield 31. In this way, if the low luminance region 26 in which the luminance of the light emitted from the display device 10 is reduced is positioned on the windshield 31 side of the display device 10 shown in FIG. The brightness of the light emitted from the display device 10 can be reduced. As a result, the reflection of the display content of the display device 10 on the windshield 31 can be reduced.

(Embodiment 2)
FIG. 6 is a schematic side view showing a second embodiment of the light distribution control panel according to the present invention. A second embodiment of the light distribution control panel according to the present invention will be described with reference to FIG.

  The light distribution control panel 1 shown in FIG. 6 basically has the same structure as the light distribution control panel shown in FIGS. 1 and 2, but the light source of the base body 7 (for example, the backlight shown in FIG. 2). 11) The difference is that a black film 8 is formed on the surface of one side surface 6 of the convex portion 2 formed on one surface opposite to the side. Even with such a configuration, the same effects as those of the light distribution control panel shown in FIGS. 1 and 2 can be obtained. That is, the light distribution control panel 1 shown in FIG. 6 includes a black film 8 as a light absorption layer formed on one side surface 6 connected to the one corner 4 as a light transmission suppressing portion. For this reason, since at least a part of the light emitted from the one side surface 6 can be absorbed by the black film 8, the luminance of the light in the direction in which the light emitted from the one side surface 6 is emitted can be reduced. As a result, the viewing angle of the region that effectively becomes the low luminance region 26 (see FIG. 3) can be increased in this direction.

  Here, the shape of the convex portion 2 of the light distribution control panel 1 shown in FIG. 6 can be basically the same as the shape of the convex portion 2 of the light distribution control panel 1 shown in FIG. 1 and FIG. .

  Next, a method for manufacturing the light distribution control panel 1 shown in FIG. 6 will be briefly described. The light distribution control panel shown in FIG. 6 can be basically manufactured using the same manufacturing method as the light distribution control panel shown in FIGS. The black film 8 can be formed using a technique such as lithography.

  FIG. 7 is a schematic side view showing a modification of the light distribution control panel shown in FIG. A modification of the light distribution control panel shown in FIG. 6 will be described with reference to FIG.

  The light distribution control panel 1 shown in FIG. 7 basically has the same structure as the light distribution control panel shown in FIG. 6, but the film formed on the side surface 6 is the black film shown in FIG. 8 is a different refractive index layer 9 having a refractive index different from that of the material constituting the convex portion 2. Even with such a configuration, the same effect as the light distribution control panel shown in FIG. 6 can be obtained. That is, the light distribution control panel shown in FIG. 7 has a refractive index different from the refractive index of the material that is formed on the one side surface 6 that continues to the one corner portion 4 as the light transmission suppressing portion. The different refractive index layer 9 may be included. In this case, by adjusting the refractive index of the different refractive index layer 9, the emission direction of the light emitted from the one side surface 6 can be changed. For this reason, when the different refractive index layer 9 is not present, the luminance of light in the direction in which the light emitted from the one side surface 6 is emitted can be reduced. As a result, the viewing angle of the region that effectively becomes the low luminance region 26 (see FIG. 3) can be increased in this direction.

  The light distribution control panel 1 shown in FIG. 7 can be basically manufactured by the same manufacturing method as the light distribution control panel shown in FIG. Further, the shape of the convex portion 2 of the light distribution control panel 1 shown in FIG. 7 can be basically the same as the shape of the convex portion 2 of the light distribution control panel 1 shown in FIG. 1 and FIG.

(Embodiment 3)
FIG. 8 is a schematic side view showing Embodiment 3 of the light distribution control panel according to the present invention. A third embodiment of the light distribution control panel according to the present invention will be described with reference to FIG.

  The light distribution control panel 1 shown in FIG. 8 basically has the same structure as the light distribution control panel 1 shown in FIGS. 1 and 2, but emits light directed toward the side surface 6 as indicated by an arrow 13. The black film 8 for shielding is different in that it is formed on the light source side surface 14 which is the back surface on the opposite side to the surface on the side where the convex portion 2 is formed in the base body 7. The black film 8 is formed in a linear shape so as to extend along the one side surface 6. Further, the end of the black film 8 and the position of the back surface of the base body 7 located directly below the one corner 4 of the convex portion 2 are in a state separated by a distance L1. The width of the black film 8 is W1. The distance L1 and the width W1 are appropriately adjusted depending on the thickness of the base body 7, the refractive index of the material constituting the base body 7 and the convex portion 2, and the like. Even with such a configuration, the same effects as those of the light distribution control panel shown in FIGS. 1 and 2 can be obtained. That is, the light distribution control panel 1 serves as a light transmission suppressing unit for light emitted from one side surface 6 of light incident on the base body 7 from the light source side surface 14 when the light source side surface 14 of the base body 7 is flat. A black film 8 as a light source side light absorption layer formed on the light source side surface 14 is included so as to block at least a part of the optical path. In this case, at least a part of the light that should be incident on the one side surface 6 can be absorbed by the black film 8. For this reason, the brightness | luminance of the light in the direction in which the light radiate | emitted from the said one side surface 6 is discharge | released can be reduced. As a result, the viewing angle of the region that effectively becomes the low luminance region 26 (see FIG. 3) can be increased in this direction.

  Here, the shape of the convex portion 2 of the light distribution control panel 1 shown in FIG. 8 can be basically the same as the shape of the convex portion 2 of the light distribution control panel 1 shown in FIG. 1 and FIG. . As the black film 8, for example, a black matrix material for liquid crystal can be used. Further, a value such as 10 μm can be used as the distance L1, and a value such as 20 μm can be used as the width W1.

  The light distribution control panel 1 shown in FIG. 8 is manufactured using the method for manufacturing the light distribution control panel 1 shown in FIGS. 1 and 2, and the light source side of the light distribution control panel on which the convex portions 2 are formed. It can be manufactured by a method in which the black film 8 is formed on the surface 14 by lithography or printing.

  FIG. 9 is a schematic side view showing a modification of the light distribution control panel shown in FIG. A modification of the light distribution control panel shown in FIG. 8 will be described with reference to FIG.

  The light distribution control panel 1 shown in FIG. 9 basically has the same structure as the light distribution control panel 1 shown in FIG. 8, but the structure formed on the light source side surface 14 of the base body 7 is a black film. The difference is that the groove 15 is not 8. A plurality of grooves 15 are formed on the light source side surface 14 of the base body 7 so as to extend linearly along the one side surface 6 of the convex portion 2. The position of the groove 15 is formed so as to reduce the amount of light incident on the one side surface 6 as indicated by the arrow 13. The distance L2 between the position of the light source side surface 14 located directly below the one corner 4 of the convex portion 2 and the groove 15, the width W2 of the groove 15, and the depth D2 of the groove 15 are the light distribution control panel. It is appropriately set according to the shape and material of 1. Even with such a configuration, the same effect as the light distribution control panel shown in FIG. 8 can be obtained. That is, the light distribution control panel 1 shown in FIG. 9 serves as a light transmission suppressing unit, when the light source side surface 14 of the base body 7 is flat, one side surface 6 of the light incident on the base body 7 from the light source side surface 14. A groove 15 formed in the light source side surface 14 is included so as to intersect the optical path of the light emitted from the light source. In this case, at least a part of the light to be incident on the one side surface 6 can be reflected or refracted on the side surface of the groove 15. For this reason, the brightness | luminance of the light in the direction in which the light radiate | emitted from the said one side surface 6 is discharge | released can be reduced. As a result, the viewing angle of the region that effectively becomes the low luminance region in the direction can be increased.

  Here, the shape of the convex portion 2 of the light distribution control panel 1 shown in FIG. 9 can be basically the same as the shape of the convex portion 2 of the light distribution control panel 1 shown in FIG. 1 and FIG. . In addition, the groove 15 can have a width W2 of 10 μm, a depth D2 of 20 μm, and a distance L2 of 15 μm.

  The light distribution control panel 1 shown in FIG. 9 can be basically manufactured by a method similar to the method for manufacturing the light distribution control panel shown in FIGS. For example, first, a mold in which a concave portion corresponding to the convex portion 2 of the light distribution control panel 1 is formed is prepared. Further, an opposing surface plate is prepared in which linear convex portions corresponding to the shape of the groove 15 shown in FIG. 9 are formed. And the resin thin film which comprises the light distribution control panel 1 shown in FIG. 9 between this metal mold | die and an opposing surface plate is set. In this state, the resin thin film is heated. Thereafter, molding is performed by pressing the heated resin thin film so as to be sandwiched between the mold and the opposing surface plate. When the mold is removed after cooling, the light distribution control panel 1 shown in FIG. 9 is obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is advantageously applied to a display device mounted on a moving body, in particular, a display device arranged adjacent to a glass surface and a light distribution control panel used in the display device.

It is a perspective schematic diagram which shows Embodiment 1 of the light distribution control panel according to this invention. FIG. 2 is a schematic side view of the light distribution control panel shown in FIG. 1. It is a schematic diagram which shows the display apparatus using the light distribution control panel shown in FIG. 1 and FIG. It is a schematic diagram which shows the motor vehicle as an example of the mobile body carrying the display apparatus shown in FIG. It is a schematic diagram which shows the dashboard of the motor vehicle shown in FIG. It is a side surface schematic diagram which shows Embodiment 2 of the light distribution control panel by this invention. It is a side surface schematic diagram which shows the modification of the light distribution control panel shown in FIG. It is a side surface schematic diagram which shows Embodiment 3 of the light distribution control panel by this invention. It is a side surface schematic diagram which shows the modification of the light distribution control panel shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Light distribution control panel, 2 convex part, 3 other corner | angular part, 4 one corner | angular part, 5 other side surface, 6 one side surface, 7 base body, 8 black film, 9 different refractive index layer, 10 display apparatus, 11 backlight, 12 display units, 13 arrows, 14 light source side surface, 15 grooves, 25 brightness securing area, 26, 27 low brightness area, 30 automobile, 31 windshield, 32 seats, 33 dashboard.

Claims (6)

A plate-like or sheet-like base material made of a translucent material, a light distribution control panel that is used in the mobile body-mounted display device disposed at a portion adjacent to the glass surface in a mobile,
The substrate has a plurality of convex portions for light distribution control formed on one surface opposite to the light source side of the substrate,
The plurality of convex portions are arranged so as to extend in parallel to each other,
A light transmission suppression unit that suppresses light incident from the light source side surface of the base material from being emitted from at least a part of the surface of the convex portion;
The convex shape portion has a triangular shape in cross section in a direction perpendicular to the extending direction of the convex shape portion,
The light transmission suppressing unit is configured to transmit the light from one side surface connected to one of the two corners located at the boundary with the surface of the base material in the cross section in the convex portion. Suppresses the emission,
The light transmission suppressing unit blocks at least a part of an optical path of light emitted from the one side surface among light incident on the base material from the light source side surface when the light source side surface of the base material is flat. , it looks including a light source side light absorbing layer formed on the light source side surface,
When used in the mobile body mounting display device, the convex portion is formed to extend in the horizontal direction of the mobile body mounting display device, and the one side surface of the convex portion is the glass surface side. Located in the light distribution control panel.   3. The light distribution control panel according to claim 1, wherein, in the convex portion, the roughness of the one side surface is greater than the roughness of the other side surface connected to the other corner portion of the two corner portions. The light distribution control panel according to claim 2 , wherein a ratio (A / B) between the roughness A of the one side surface and the roughness B of the other side surface is 3 or more and 3000 or less. The angle α of the other one of the corners of the two corners is at 40 ° or less 5 ° or more, the angle β of one corner portion is 60 ° to 90 °, claim 1-3 The light distribution control panel according to any one of the above. A light source;
The light distribution control panel according to any one of claims 1 to 4 , disposed on the light source,
And a display unit mounted on the light distribution control panel. The mobile body mounting display device is arranged at a site adjacent to the glass surface in the mobile body,
The display device for mounting on a moving body according to claim 5 , wherein a direction perpendicular to a direction in which the convex portion extends is arranged to be a direction toward the glass surface.

Images