JP7420136B2 - Transparent display device, glass plate with transparent display device, laminated glass with transparent display device, and moving object - Google Patents

Description

The present invention relates to a transparent display device, a glass plate with a transparent display device, a laminated glass with a transparent display device, and a moving object.

2. Description of the Related Art Display devices using light emitting diodes (LEDs) as display pixels are known. This display device includes a transparent display device that allows an image on the back side to be viewed through the device.
In order to manufacture a display device, it is necessary not only to reduce the size of the light emitting section and the driving circuit that makes the active matrix such as TFT, but also to make the wiring itself thinner. In a transparent display device, the background can be seen through, so it is necessary to make the image brightness brighter than in a normal display device.

From the above, the current density per wire tends to be high, and heat is easily generated in the wire. In this case, the part where the amount of current is the largest is the connection part between the main line whose base end is connected to the circuit section and supplies current to each LED, and the branch line which branches off from the main line and connects to each LED. Become. When heat is generated in one part, a temperature distribution occurs within the display area, which causes distortion due to thermal expansion of the transparent base material of the display device, and in the worst case, there is a risk of cracking and damage. .

Display devices that efficiently dissipate heat generated from light emitting diodes are known.
Patent Document 1 discloses a display device having a configuration in which an electrode belonging to one light emitting diode row out of a plurality of light emitting diode rows and an electrode belonging to another light emitting diode row overlap each other in the longitudinal direction (zigzag arrangement). has been done.
Further, Patent Document 2 discloses a display device in which the lateral dimension, average thickness, heat capacity, and thermal conductivity of electrical interconnections are set to predetermined values.

Japanese Patent Application Publication No. 2013-47737 US Patent No. 9765934

However, in the conventional example of Patent Document 1, although it is disclosed that the heat generated from the optical elements is dispersed by distributing the optical elements evenly, the heat generated from the wiring itself is not taken into consideration.
In the conventional example of Patent Document 2, there is no description or suggestion regarding the temperature rise of components other than the LED, and if current concentrates on components other than the LED, that is, the wiring part and generates heat, the temperature of the display area may increase. There is sex.

In view of the above points, an object of the present invention is to prevent damage to a transparent base material caused by heat generation from the wiring portion in a transparent display device.

In order to solve the above problems, one form of the present invention includes a transparent base material, a plurality of light emitting parts arranged on the transparent base material, a wiring part connected to each of the light emitting parts, and an electric circuit. A transparent display device, comprising: a control section configured of a substrate, supplying current to the light emitting section through the wiring section and returning current from the light emitting section, wherein the light emitting section and the wiring section are arranged in a display area. , each of the light emitting parts includes a light emitting diode having an area of 1 mm ² or less, and the wiring part disposed in the display area is located in a region obtained by dividing the display area into a plurality of areas each having the same predetermined area. The product of the reciprocal (1/Dn) of the cross-sectional area (Dn) orthogonal to the longitudinal direction of the wiring section and the length (Ln) along the longitudinal direction (Vn=Ln/Dn) of the divided portion The variation in the individual values of the divided regions with respect to the average value of the regions is within 30%, and in the display region, the area of the region where the transmittance of visible light is 20% or less is 60% or less.

According to one embodiment of the present invention, the average of the product (Vn=Ln/Dn) of the reciprocal of the cross-sectional area (Dn) and the length (Ln) of the wiring part in the display area (Vn=Ln/Dn) in the divided area Variations in individual values in the area fall within a predetermined range. Therefore, it is possible to prevent the display area from becoming hot due to the heat generated by the wiring portion and damaging the transparent base material.

FIG. 1 is a schematic plan view showing the basic configuration of a transparent display device according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view showing a part of the transparent display device according to the first embodiment. 2 is a cross-sectional view showing a part of the transparent display device according to the first embodiment, taken at a different position from FIG. 2. FIG. FIG. 1 is a schematic plan view showing an enlarged part of the transparent display device in the first embodiment. FIG. 2 is a schematic plan view showing the basic configuration of a transparent display device according to a second embodiment of the present invention. FIG. 7 is a cross-sectional view showing a part of a transparent display device according to a second embodiment. FIG. 7 is a cross-sectional view showing a part of a transparent display device according to a third embodiment of the present invention. FIG. 4 is a sectional view showing a part of an automobile according to a fourth embodiment of the present invention. FIG. 6 is a schematic diagram of a windshield in the fourth embodiment and a modified example when viewed from inside the vehicle. FIG. 7 is a schematic plan view showing the basic configuration of a transparent display device according to a fifth embodiment of the present invention. FIG. 7 is a schematic plan view showing the basic configuration of a transparent display device according to a sixth embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated. In each drawing, the same or corresponding configurations may be given the same or corresponding symbols and the description thereof may be omitted. Further, the present invention is not limited to the embodiments described below.

One form of the present invention is a transparent display device including a transparent base material, a light emitting section disposed on the transparent base material, and a wiring section connected to each of the light emitting sections. Each of the light emitting parts includes a light emitting diode having an area of 1 mm ² or less, and the area of a region where the transmittance of visible light is 20% or less in the display area including the light emitting part and the wiring part is 60% or less.

In this specification, the term "transparent display device" refers to a display device that allows visual information such as a person or background located on the back side of the display device (the side opposite to the viewer) to be visible under a desired usage environment. . Note that "visible" is determined at least when the display device is in a non-display state, that is, in a state where no electricity is applied.

In addition, in this specification, "transparent" (or having translucency) refers to a visible light transmittance of 40% or more, preferably 60% or more, more preferably 70% or more. . Further, it may refer to a material having a transmittance of 5% or more and a haze (cloudiness) of 10 or less. If the transmittance is 5% or more, when looking outside during the day from inside the room, the outside can be seen with the same level of brightness as indoors, or even brighter, making it possible to ensure sufficient visibility. Become. In addition, if the transmittance is 40% or more, even if the brightness on the viewer side and on the other side (back side) of the transparent display device are about the same, the other side of the transparent display device can be seen without any problem. It becomes possible to do so. Further, if the haze is 10 or less, the contrast of the background can be ensured at 10, so that it is possible to substantially see the other side of the transparent display device without any problem. "Transparent" does not matter whether a color is added or not, that is, it may be colorless and transparent, or it may be colored and transparent.

In this specification, "transmittance of visible light" refers to the transmittance of visible light in a display area of a certain area that includes a light-transmitting part of a transparent display device and a light-not transmitting part such as a part where an element is arranged. Refers to the percentage of visible light that is transmitted. Note that the visible light transmittance refers to a value (%) measured by a method based on ISO9050. Haze (cloudiness) refers to a value measured by a method based on ISO14782. Further, the transmittance measurement of visible light is performed under the condition that the area through which the beam of light passes through the display area of the transparent display device includes at least one pixel or more, preferably a plurality of pixels.

In addition, in this specification, the term "display area" refers to the area in which images (including characters) are displayed on a transparent display device, the maximum range in which the brightness can change depending on the light emitting part, and the wiring for driving the light emitting part. Refers to the area that includes the area where the part is located. When the driver of the light emitting section is made of a transparent member and placed on a transparent base material, the "display area" in this specification refers to the maximum range in which the brightness can change depending on the light emitting section.

Moreover, in this specification, a "glass plate" includes both inorganic glass and organic glass. For example, examples of inorganic glass include soda lime glass, alkali-free glass, borosilicate glass, etc., and examples of organic glass include transparent resins such as polycarbonate and acrylic resin.

[First embodiment]
First, a schematic configuration of a transparent display device according to a first embodiment of the present invention will be described.
<Configuration of transparent display device>
As shown in FIG. 1, the transparent display device 1 includes a transparent base material 10, a light emitting section 20, an IC chip 30, a wiring section 40, a row data line 43, a column data line 44, a driver 50, a control section 60, and a connection section. A wiring section 70 is provided. Here, the control section 60 is composed of an electric circuit board. The connection wiring section 70 connects the control section 60 and the wiring section 40.

The transparent display device 1 has a display area A. Display area A includes a light emitting section 20, an IC chip 30, a wiring section 40, a row data line 43, and a column data line 44 when viewed in plan. In FIG. 1, the display area A is shown as having a planar rectangular shape, but the present embodiment is not limited to this shape.

The driver 50 controls driving of the IC chip 30 under the control of the control unit 60. The driver 50 includes a row driver 51 that is connected to the IC chips 30 arranged in the column direction and controls the driving of the IC chips 30, and a column driver 51 that is connected to the IC chips 30 arranged in the row direction and controls the driving of the IC chips 30. A driver 52 is provided. Note that at least one of the row driver 51 and the column driver 52 may be made of a transparent material and placed on the transparent base material 10, or if it is not made of a transparent material, it may be placed on a location other than the transparent base material 10. It may be placed in

The control unit 60 is arranged outside the display area A. A peripheral region B is provided between the control section 60 and a portion of the outer periphery of the display area A that faces the control section 60, and a connection wiring section 70 is arranged in the peripheral region B. Note that even outside the display area A, the area where the connection wiring section 70 is not arranged does not constitute the peripheral area B.

The light emitting units 20 are arranged in a matrix (lattice) in the display area A in the row and column directions, that is, in the X and Y directions in FIG. The arrangement form of the light emitting parts 20 is not limited to the matrix form, but may be another arrangement form such as a houndstooth pattern (offset form) in which light emitting parts of the same color are arranged at substantially constant intervals in a specific direction.
The IC chip 30 is connected to the light emitting section 20 and drives the light emitting section 20. Note that the IC chip 30 may be omitted.

The wiring section 40 includes a power supply line 41 and a ground line 42, each of which is a linear body. In this embodiment, the power supply line 41 and the ground line 42 are arranged in the same plane forming the display area A, that is, in the plane at the same position in the thickness direction of the transparent base material 10. Since these wirings are arranged in the same plane, the work of forming the wiring section 40 is facilitated.

The power line 41 includes a first main power line 411 , a second main power line 412 , a first branch line 413 , and a second branch line 414 . The first power supply main line 411 extends from the control unit 60 in the upward direction (column direction) in FIG. The second main power line 412 extends from the tip of the first main power line 411 in the right direction (row direction). The first power branch lines 413 extend downward (in the column direction) from multiple locations on the second main power line 412 . The second power branch line 414 extends in the right direction (row direction) from multiple locations of each of the first main power line 411 and the first power branch line 413 and is connected to the light emitting unit 20 and the IC chip 30, respectively. There is.

The second power supply main line 412 has two linear parts 412A that face each other and whose base ends are electrically connected to the control unit 60, and a linear part that connects mutually opposing parts of the linear parts 412A. It has a connecting portion 412B. Accordingly, since the second power supply main line 412 is composed of two linear portions 412A, the places where heat is generated are separated from each other, and uneven distribution of heat can be suppressed even with the same amount of heat generation.
The connecting portion 412B includes a linear tip connecting portion 412C that connects the tip ends of the two linear portions 412A, and a linear intermediate connecting portion 412D that connects the intermediate portions.

The intermediate connection parts 412D have the same number of first power supply branch lines 413 along the longitudinal direction of the second power supply main line 412, and the intermediate connection parts 412D are arranged on a straight line of the first power supply branch lines 413. has been done. Since the tip connecting portion 412C is connected to the tips of the two linear portions 412A, the second power supply main line 412 forms a loop, and current is supplied to a predetermined light emitting portion 20 through two routes, and the light emitting portion 20 Returns the current from the Furthermore, since there are a plurality of intermediate connection parts 412D in addition to the tip connection part 412C, the second power supply main line 412 is formed in a ladder shape, and there are many routes for supplying current to the light emitting part 20 and returning. . Therefore, the current flows through the shortest route among the plurality of routes, so if the light emitting unit 20 that is far from the control unit 60 does not emit light, it is difficult for the current to flow through the part of the second power supply main line 412 that corresponds to the light emitting unit 20. , heat generation can be suppressed.

The ground line 42 includes a first main ground line 421 , a second main ground line 422 , a first branch branch line 423 , and a second branch line 424 . The first main ground line 421 extends from the control section 60 in the upward direction (column direction) in FIG. The second main ground line 422 extends from the tip of the first main main ground line 421 in the right direction (row direction). The first ground branch lines 423 extend upward (in the column direction) from multiple locations on the second main ground line 422 . The second ground branch line 424 extends leftward (row direction) from multiple locations of the first ground branch line 423 and is connected to the light emitting section 20 and the IC chip 30, respectively. The second main ground line 422 is not directly electrically connected to the first power branch line 413. The first ground branch line 423 is not directly electrically connected to the second power supply main line 412.

The second main ground line 422 includes two linear parts 422A that face each other and whose base ends are electrically connected to the control unit 60, and a linear part that connects mutually opposing parts of the linear parts 422A. It has a connecting portion 422B.

The connecting portion 422B includes a linear tip connecting portion 422C that connects the tip ends of the two linear portions 422A, and a linear intermediate connecting portion 422D that connects the intermediate portions. The intermediate connecting portions 422D have the same number of first ground branch lines 423 along the longitudinal direction of the second main ground line 422, and the intermediate connecting portions 422D are arranged on a straight line of the first ground branch lines 423. has been done.
Since the second main ground line 422 has the same configuration as the second main power line 412, it has the same effect as the second main power line 412.

The connection wiring section 70 includes a first wiring section 71 that connects the control section 60 and the first main power line 411, and a second wiring section 72 that connects the control section 60 and the first main ground line 421. .
With such a configuration, the current supplied from the control section 60 flows to each light emitting section 20 and each IC chip 30 via the first wiring section 71 and the power supply line 41, and flows through the ground line 42 and the second wiring section 72. The process returns to the control unit 60 via the process.

The row data line 43 and the column data line 44 are formed in a plane different from the plane in which the power supply line 41 and the ground line 42 are formed.
The row data line 43 is electrically connected to the row driver 51 and the IC chips 30 arranged in the row direction. The column data line 44 is electrically connected to the column driver 52 and the IC chips 30 arranged in the column direction.
The control section 60 and the row driver 51 are connected by a linear first connection line section 73. The control section 60 and the column driver 52 are connected by a linear second connection line section 74 .

As shown in FIGS. 2 and 3, on the main surface of the transparent base material 10, a light emitting section 20, an IC chip 30, a wiring section 40, and an insulating layer 14 that insulates these are arranged. The insulating layer 14 is formed from a material that does not contain halogen, that is, an insulating member containing a halogen-free material. Halogen-free materials include, for example, epoxy resins, phenol resins, polyolefin resins, polycycloolefin resins, polyesters that do not contain halogen flame retardants that are likely to generate dioxins, or do not have halogen groups in their molecular skeletons. Examples include resins, acrylic resins, polyimide resins, and copolymers thereof. Other candidates include various thermoplastic resins and resins made by curing polyfunctional monomers. As a result, even if the transparent base material 10 were to be damaged due to overheating, since a halogen-free material is used as the insulating layer 14, problems such as scattering of harmful substances can be avoided.

As shown in FIG. 4, each of the plurality of light emitting sections 20 is provided for each pixel (also referred to as a pixel or display pixel) of the transparent display device 1. That is, each light emitting section 20 corresponds to each pixel of the transparent display device 1, and one light emitting section 20 constitutes one pixel. Note that one light emitting section 20 may constitute a plurality of pixels.

Each light emitting unit 20 includes at least one light emitting diode (LED). Therefore, in this embodiment, at least one LED constitutes each pixel of the transparent display device 1. As described above, the transparent display device 1 according to the present embodiment is a display device that uses LEDs as pixels, and is a so-called LED display (LED display device).

Each light emitting section 20 may include two or more LEDs. Each light emitting section 20 may include a red LED 21R, a green LED 21G, and a blue LED 21B. Each LED corresponds to each sub-pixel (sub-pixel) constituting one pixel. Furthermore, each light emitting section 20 may include two or more LEDs of similar colors. This makes it possible to increase the dynamic range of the video.

The LED used in this embodiment is preferably a micro-sized so-called mini LED, and more preferably a micro LED that is even smaller than a mini LED. Specifically, the length of the mini-LED in the row direction (X direction) may be 1 mm or less, and the length in the column direction (Y direction) may be 1 mm or less. The length of the micro LED in the row direction may be 100 μm or less, preferably 50 μm or less, and more preferably 20 μm or less. The length of the micro LED in the column direction may be 100 μm or less, preferably 50 μm or less, and more preferably 20 μm or less. There is no particular limitation on the lower limit of the length of the LED in the row direction and column direction. However, when trying to obtain the same brightness in a small area, the amount of heat generated increases in inverse proportion to the area of the LED, so it is preferable to have a size of a certain size or more in terms of heat countermeasures. Further, in view of various manufacturing conditions and the like, it is preferable that the thickness of each layer is 1 μm or more, particularly in order to reduce edge effects.

Further, the area occupied by one LED on the transparent base material 10 may be 1 mm ² or less. This area is preferably 10,000 μm ² or less, more preferably 1,000 μm ² or less, even more preferably 100 μm ² or less. Note that the lower limit of the area occupied by one LED on the transparent base material 10 can be set to 10 μm ² or more due to manufacturing conditions and the like.

Normally, the limit at which a person with visual acuity of 1.5 can visually recognize the thickness in an image 1 meter away is 50 μm, and it is said that it is difficult to directly visually recognize thickness of 15 μm or less. Therefore, by using the above-mentioned micro-sized LEDs, the LEDs are not visible even when an observer observes the display device relatively close to each other, for example, at a distance of several tens of centimeters to two meters. Or, even if it is visible, its presence is not noticeable. Therefore, the visibility of the image on the back side of the display device is improved.

When a flexible material is used as the transparent base material 10, even if the resulting display device is bent, the LEDs will not be damaged and can be used as pixels because the micro-sized LEDs as described above are used. function properly. Therefore, when the display device according to the present embodiment is used by being attached to a glass plate having a curved surface, for example, a glass plate bent in two directions perpendicular to each other, or when being used by being sealed between two such glass plates. Even when used, the display device is not easily damaged.

The transparency of the LED itself is low, for example, its transmittance is about 10% or less. By using micro-sized LEDs, it is possible to reduce the area where the LED blocks light transmission, and it is possible to reduce the area where the transmittance is low in the display area, for example, the area where the transmittance is 20% or less. Further, by using micro-sized LEDs, the area with high transmittance increases in the pixel, so the transparency of the display device is improved and the visibility of images on the back side is improved.

There is no limit to the type of LED used, but it can be of chip type. The LED may be in an unpackaged state, entirely enclosed in a package, or at least partially covered with resin. The covering resin may have a lens function to increase the light utilization efficiency and the efficiency of light extraction to the outside. Note that when the LED is packaged, the area occupied by one LED and the dimensions of the LED (X-direction dimension and Y-direction dimension) mentioned above refer to the area and dimension in the state after packaging. When three LEDs are enclosed in one package, the area of each LED can be one-third or less of the area of the entire package.

The shape of the LED is not particularly limited, but may be rectangular, square, hexagonal, pyramidal, pillar-shaped, or the like.
The LED can be grown by a liquid phase growth method, HDVPE method, MOCVD method, etc., and then cut and mounted. The LEDs may be peeled off the semiconductor wafer and transferred onto the substrate by microtransfer printing or the like.

The material of the LED is not particularly limited, but is preferably an inorganic material. For example, in the case of a red LED, AlGaAs, GaAsP, GaP, etc. are preferable as the material for the light emitting layer. For green LEDs, InGaN, GaN, AlGaN, GaP, AlGaInP, ZnSe, etc. are preferable. For blue LEDs, InGaN, GaN, AlGaN, ZnSe, etc. are preferable.

The luminous efficiency (energy conversion efficiency) of the LED is preferably 1% or more, more preferably 5% or more, and even more preferably 15% or more. By using an LED with a luminous efficiency of 1% or more, sufficient brightness can be obtained even if the size of the LED is minute as described above, and it can also be used as a display member during the day. Further, when the luminous efficiency of the LED is 15% or more, the amount of heat generated can be reduced, and it becomes easy to encapsulate the LED inside the laminated glass using the resin adhesive layer.

Each light emitting section 20 is provided at a predetermined interval. The pitch between the light emitting parts 20 corresponds to the pitch of pixels. In FIG. 4, the pixel pitch in the X direction is indicated by P _px , and the pixel pitch in the Y direction is indicated by P _py . In this specification, the pixel pitch refers to at least one of the pixel pitch P _px in the X direction and the pixel pitch P _py in the Y direction.

P _px is, for example, 30 mm or less, preferably 100 μm or more and 5000 μm or less, more preferably 180 μm or more and 3000 μm or less, and still more preferably 250 μm or more and 1000 μm or less. P _py is, for example, 30 mm or less, preferably 100 μm or more and 5000 μm or less, more preferably 180 μm or more and 3000 μm or less, and even more preferably 250 μm or more and 1000 μm or less. Further, the area of region P of one pixel is expressed as P _px ×P _py . The area of one pixel is, for example, 900 mm ² or less, preferably 1×10 ⁴ μm ² or more and 2.5×10 ⁷ μm ² or less, more preferably 3×10 ⁴ μm ² or more and 9×10 ⁶ μm ² or less, and more preferably 6×10 ⁴ μm ² or more and 1×10 ⁶ μm ² or less.

By setting the pixel pitch within the above range, high translucency can be achieved while ensuring sufficient display performance. Further, it is possible to reduce or prevent a diffraction phenomenon that may occur due to light coming from the back side of the transparent display device.
In FIG. 1, the pixel density in the display area A may be 0.8 ppi or more, preferably 5 ppi or more, more preferably 10 ppi or more, and still more preferably 25 ppi or more.

The pixel pitch may correspond to the pitch of LEDs of the same color included in each light emitting section 20. For example, the pixel pitch P _px in the X direction may correspond to the pitch of the red LEDs 21R in the X direction, and the pixel pitch P _py in the Y direction may correspond to the pitch of the red LEDs 21R in the Y direction.
The area of one pixel can be selected as appropriate depending on the size of the screen or display area, the purpose, the viewing distance, and the like. By setting the area of one pixel to 1×10 ⁴ μm ² or more and 2.5×10 ⁷ μm ² or less, the transparency of the display device is improved while ensuring appropriate display performance.

The area of each LED is preferably 30% or less, preferably 10% or less, more preferably 5% or less, and even more preferably 1% or less with respect to the area of one pixel. By setting the area of one LED to 30% or less of the area of one pixel, transparency and visibility of images on the back side of the display device are improved.
Further, the total area occupied by the LEDs in the display area A is preferably 30% or less, preferably 10% or less, more preferably 5% or less, and even more preferably 1% or less.

When each light emitting unit 20 includes a plurality of LEDs, the distance between the LEDs in each pixel (in each light emitting unit 20) is preferably 3 mm or less, more preferably 1 mm or less, and preferably 100 μm or less. More preferably, the thickness is 10 μm or less. Further, in each light emitting section 20, a plurality of LEDs may be arranged in contact with each other. This makes it easier to share the power supply wiring and improves the aperture ratio.

Each IC chip 30 is arranged corresponding to each pixel, that is, for each light emitting section 20, and drives each pixel. Moreover, each IC chip 30 is arranged corresponding to a plurality of pixels, that is, for each plurality of pixels, and can drive a plurality of pixels.
The IC chip 30 may be placed on the transparent base material 10, but it is also possible to place metal pads such as copper, silver, gold, etc. on the transparent base material 10, and place the IC chip thereon. Good too. The above-mentioned LEDs may be placed on the pad as well. Further, the area occupied by the pad is preferably 80 μm ² or more and 40000 μm ² or less, more preferably 300 μm ² or more and 2000 μm ² or less.

As the IC chip 30, a hybrid IC or the like having an analog part and a logic part can be used. The area of the IC chip 30 may be 100,000 μm ² or less, preferably 10,000 μm ² or less, and more preferably 5,000 μm ² or less. The analog portion of the IC chip 30 may include a transformer circuit and the like in addition to the circuit that controls the amount of current. Since the IC chip 30 itself has low transparency, by using the IC chip 30 of the above size, the area where the IC chip 30 blocks the transmission of light can be reduced, and the area where the transmittance is low in the display area A, e.g. This can contribute to reducing the area where the ratio is 20% or less. Further, by using the IC chip 30 with an area of 20,000 μm ² or less, the area with high transmittance increases, so the transparency of the display device is improved and the visibility of images on the back side is improved.

The wiring section 40 is connected to each light emitting section 20 as described above, and each light emitting section 20 can be individually controlled.
Materials for the wiring portion 40, row data line 43, column data line 44, first wiring portion 71, and second wiring portion 72 include metals such as copper, aluminum, silver, and gold, carbon nanotubes, and ITO (tin-doped indium oxide). (Indium Tin oxide)), ATO (Antimony Tin oxide) _, PTO ₍ Phosphorus Tin oxide), ZnO ₂ , _ZSO ((ZnO) ₎ ) and other transparent conductive materials. Among these materials, copper is preferred because of its low resistivity. Further, the wiring portion 40 may be coated with a material such as Ti, Mo, copper oxide, or carbon for the purpose of reducing reflectance. Furthermore, irregularities may be formed on the surface of the coated material.

The width of each wiring included in the wiring section 40 is preferably 100 μm or less, more preferably 50 μm or less, and even more preferably 15 μm or less. As mentioned above, the limit at which a person with visual acuity of 1.5 can visually recognize the thickness in an image 1 meter away is 50 μm, and it is said that it is difficult to directly visually recognize the thickness below 15 μm. Therefore, by setting the line width to 100 μm or less, preferably 50 μm or less, even when an observer observes the display device relatively close to each other, for example, at a distance of several tens of cm or more and 2 meters or less, The wiring part is not visible or is not noticeable even if it is visible. Therefore, the visibility of the image on the back side of the display device is improved.

When the transparent display device 1 is irradiated with light from the outside, diffuse reflection may occur, and in some cases, diffraction may occur, so that the visibility of the image on the other side of the transparent display device 1 may be reduced. In particular, when the wiring mainly extends in the X direction and the Y direction as in the illustrated example, a cross-shaped diffraction image extending in the X direction and the Y direction tends to appear. On the other hand, by reducing the width of each wiring, it is possible to reduce or prevent the diffraction phenomenon that may occur due to light from the back side of the transparent display device, thereby further improving the visibility of the image on the back side. From the viewpoint of reducing diffraction, the width of each wiring is preferably 50 μm or less, more preferably 10 μm or less, and still more preferably 5 μm or less. Note that the light from the back side of the transparent display device described above is light emitted from a light source different from the light emitting section included in the transparent display device.

The width of each wiring included in the wiring section 40 is preferably 0.5 μm or more. By setting the width of the line to 0.5 μm or more, it is possible to prevent the wiring resistance from increasing excessively, thereby preventing a voltage drop in the power supply and a decrease in signal strength. Further, it is preferable because the thermal conductivity is improved at the same time.
The electrical resistivity of the wire constituting the wiring portion 40 is preferably 1.0×10 ⁻⁶ Ωm or less, more preferably 2.0×10 ⁻⁸ Ωm or less. Further, the thermal conductivity of the wires constituting the wiring portion 40 is preferably 150 W/(m・K) or more and 5500 W/(m・K) or less, and 350 W/(m・K) or more and 450 W/(m・K). ) or less is more preferable.

In the wiring section 40, the distance between adjacent wires (including the distance between wires having different functions) is, for example, 5 μm or more and 50,000 μm or less, preferably 10 μm or more and 3,000 μm or less, and more preferably 100 μm or more and 2,000 μm or less. Further, the interval between adjacent wirings in at least one of the X direction and the Y direction is set to, for example, 5 μm or more and 50000 μm or less, preferably 10 μm or more and 3000 μm or less, and more preferably 100 μm or more and 2000 μm or less. The interval between wirings having the same function, for example, the interval between power supply lines, is preferably 150 μm or more and 5000 μm or less, more preferably 300 μm or more and 3000 μm or less. Also, when the power supply line and the ground line are formed in a lattice shape, the spacing between adjacent wires in the lattice can be the same, and the sheet resistance of the wiring formed in the lattice shape is preferably 10Ω/□ or less. , more preferably 5Ω/□ or less.

If the lines are dense, or if there are areas where the lines are dense, visibility of the image on the back side may be hindered. Therefore, by setting the interval between adjacent lines to 5 μm or more, such hindrance to visual recognition can be reduced. However, if the width of the wiring is as small as 5 μm or less, and if the transparency of the display device can be ensured, the space between the wirings may be shielded from light with a black matrix or the like so that the size is less than the wavelength of light. Further, by setting the interval between adjacent lines to 3000 μm or less, wiring can be configured to ensure sufficient display performance.

By setting the distance between the lines of the wiring section 40 to 100 μm or more in at least one of the X direction and the Y direction, it is possible to prevent a decrease in visibility due to diffuse reflection, diffraction, or the like.
Note that the distance between adjacent wires mentioned above is the maximum value of the distance between adjacent wires if the distance between the wires is not constant, such as when the wires are curved or the wires are not arranged parallel to each other. Can be done. In this case, it is preferable to focus on wiring that extends across a plurality of pixels.

In FIG. 1, the display area A is divided into 90 pieces in the X direction and 90 pieces in the Y direction so that each piece has the same area as one pixel corresponding to the light emitting part ²⁰ , for example, about 0.1 cm2. Divide into 60 pieces for a total of 5400 pieces. In that case, the divided areas An (n=1 to 5400) are A ₁ , A ₂ , A ₃ , . . . A ₅₉ , A ₆₀ , . . . A ₅₃₉₉ , A ₅₄₀₀ . Here, if the predetermined area is a unit area of 1 ^cm2 , the range of ¹ cm2 of unit area is an area of 9 pixels (pixels) in total, 3 pixels (pixels) in the X direction and 3 pixels (pixels) in the Y direction. roughly corresponds to Therefore, the display area A is divided into 600 areas each having the same unit area. Note that each of the 600 divided regions includes a wiring section 40.

In the present embodiment, in a region obtained by dividing the display area A into areas having the same area as a unit area (1 cm ² ), the reciprocal (1/Dn) of the cross-sectional area Dn perpendicular to the longitudinal direction of the wiring portion 40 and the longitudinal direction The variation (relative standard deviation) of the value of the product of length Ln (Vn=Ln/Dn) of each region with respect to the average value of the region is within 30%. Here, the variation refers to the variation in the region where the desired light is emitted, and abnormal values in the region where the light is not emitted due to a defect such as a disconnection are not included in the range of the variation.

The cross-sectional area Dn of the wiring section 40 is the product of the width w and the height t (see FIGS. 2 and 3) of each wiring constituting the wiring section 40. The width w and height t of the wiring constituting the wiring section 40 may be designed values or measured values.
Note that the predetermined area is not limited to a unit area (1 cm ² ) corresponding to nine pixels of the light emitting section 20, but may be an area corresponding to one pixel, for example.

In addition, the combined area of the display area A and the peripheral area B is divided so that the area is the same as the area of one pixel corresponding to each light emitting part 20, and the wiring part 40 and The area of the wiring of the connection wiring section 70 is assumed to be 0.8. In this case, it is preferable to set the area ratio of the wiring other than the wiring part 40 and the connection wiring part 70 to 1:0.8 or less. It is more preferable to set the ratio to be 1:20 or more, and even more preferably to set the ratio to be 1:10 or more and 1:0.8 or less.

Here, 1:0.8 or less means that the area of the wiring in the wiring part 40 and the connection wiring part 70 is 0.8 times or more the area of the wiring other than the wiring part 40 and the connection wiring part 70. . 1:1 means that the area of the wiring in the wiring part 40 and the connection wiring part 70 is the same as the area of the wiring other than the wiring part 40 and the connection wiring part 70. 1:10 means that when the area of the wiring in the wiring part 40 and the connection wiring part 70 is 1, the area of the wiring other than the wiring part 40 and the connection wiring part 70 is 10. . 1:10 or more means that the area of the wiring in the wiring part 40 and the connection wiring part 70 is 10 times or less the area of the wiring other than the wiring part 40 and the connection wiring part 70.

In FIG. 1, the display area A is divided into n pieces, for example, 5400 pieces, so that each area has the same area as one pixel corresponding to the light emitting section 20. In FIG.
The peripheral area B is divided into a plurality of areas, each having the same area as one pixel corresponding to the light emitting part 20, and in FIG. 1, it is divided into two areas, area B ₁ and area B ₂ . .
The ratio (S1:S2) between the area S1 of the wiring of the wiring part 40 and the area S2 of the wiring of the part other than the wiring part 40 in the divided area An of the display area A is 1:10 or more and 1:0.8 or less ( 0.8≦S1/S2≦10).
Here, the area is the product of the width and length of each wiring.

In the present embodiment, the ratio (T1:T2) between the area T1 of the wiring of the connection wiring section 70 and the area T2 of the wiring other than the connection wiring section 70 in the peripheral region B is 1:10 or more and 1:0.8. It is preferable that it is below (0.8≦T1/T2≦10). That is, the ratio (T1:T2) is the ratio (S1:S2) of the area (S1) of the wiring of the wiring part 40 in the divided area An in the display area A to the area (S2) of the wiring other than the wiring part 40. Preferably, they are about the same.

Row data lines 43 extending across a plurality of pixels are arranged in the X direction, and column data lines 44 are arranged in the Y direction. Such a configuration is preferable from the viewpoint of increasing the area of the panel. It is not necessary to arrange the row data line 43 or the column data line 44.
The area occupied by the wiring section 40 in the area of one pixel is preferably 30% or less, preferably 10% or less, more preferably 5% or less, and 3% or less of the area of one pixel. It is even more preferable. Further, the area occupied by the wiring section 40 in the entire display area is preferably 30% or less of the area of the display area, preferably 10% or less, more preferably 5% or less, and 3% or less. It is even more preferable.
In the display area A, the area of the region where the transmittance is 20% or less is 60% or less, preferably 30% or less, and more preferably 10% or less. Thereby, the area where the wiring section 40 blocks light transmission can be reduced.

In the area of one pixel, the area occupied by the light emitting part 20, the IC chip 30, and the wiring part 40 is preferably 30% or less, more preferably 20% or less, and 10% or less of the area of one pixel. It is even more preferable. Furthermore, the area occupied by the light emitting section 20, the IC chip 30, and the wiring section 40 is preferably 30% or less, more preferably 20% or less, and 10% or less of the area of the display area A. More preferred. When the transparent display device 1 does not include the IC chip 30, the area occupied by the light emitting section 20 and the wiring section 40 with respect to the area of one pixel or display area A should be the same value as when the transparent display device 1 includes the IC chip 30. is preferred.

The transparent base material 10 is not particularly limited as long as it has insulating properties and is transparent, but it preferably contains resin, and is preferably mainly made of resin. Resins used for the transparent base material include polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), olefin resins such as cycloolefin polymer (COP) and cycloolefin copolymer (COC), cellulose, Cellulose resins such as cellulose acetate and cellulose triacetate (TAC), imide resins such as polyimide (PI), polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polyvinyl acetate (PVAc), polyvinyl Vinyl resins such as alcohol (PVA) and polyvinyl butyral (PVB), acrylic resins such as polymethyl methacrylate (PMMA), and those whose skeletons are crosslinked, ethylene/vinyl acetate copolymer resin (EVA), urethane resins, etc. can be mentioned. Further, as the transparent base material 10, thin glass such as glass having a thickness of 200 μm or less, preferably 100 μm or less, can also be used.

Among the materials used for the transparent base material 10, polyethylene naphthalate (PEN) and polyimide (PI) are preferable from the viewpoint of improving heat resistance. Furthermore, cycloolefin polymers (COP), cycloolefin copolymers (COC), polyvinyl butyral (PVB), and the like are preferable because they have a low birefringence and can reduce distortion and blurring of images viewed through a transparent substrate.
The above materials can be used alone or in combination of two or more, that is, in a mixed form of different materials, or by laminating planar base materials made of different materials. The thickness of the entire transparent base material 10 is preferably 3 μm or more and 1000 μm or less, more preferably 5 μm or more and 200 μm or less. The visible light internal transmittance of the transparent base material 10 is preferably 50% or more, more preferably 70% or more, and even more preferably 90% or more.

It is preferable that the transparent base material 10 has flexibility. Thereby, for example, when the transparent display device 1 is mounted on a curved glass plate or used by being sandwiched between two curved glass plates, the transparent display device 1 can be easily made to follow the curvature of the glass plate. Further, it is more preferable that the material exhibits shrinkage behavior when heated to 100° C. or higher.
It is preferable that the transparent base material 10 has a passivation layer. A passivation layer includes an inorganic layer such as SiO _x , SiN _x , AlN, SiAlO _x , or SiON, a resin layer such as cycloolefin, polyimide, epoxy, acrylic, or novolac, a lamination of an inorganic layer and a resin layer, or a siloxane layer. The layer is made of a silicon-based polymer such as a silazane-based polymer, a silazane-based polymer, or a hybrid material of organic and inorganic materials.

<Effects of the first embodiment>
In the first embodiment, the wiring section 40 arranged in the display area A has a width Vn, which is the product of the reciprocal (1/Dn) of the cross-sectional area Dn per unit area and the length Ln in an area An obtained by dividing the display area A into a plurality of areas. The variation in the value (Vn=Ln/Dn) with respect to the average value Vave is within 30%. Therefore, even if a current flows through the power supply line 41 and the ground line 42 and generates heat, a specific portion of the display area A does not become overheated, so that damage to the transparent base material 10 can be prevented.

Furthermore, the combined area of the display area A and the peripheral area B in which the connection wiring section 70 is arranged is divided into multiple parts so that each area has the same area as the pixel corresponding to the light emitting section 20. The area of the wiring of the wiring part 40 and the connection wiring part 70 in the divided area is set to 0.8. In that case, the area ratio of the wiring other than the wiring part 40 and the connection wiring part 70 is within a certain range of 1:10 or more and 1:0.8 or less. Therefore, in a range including not only the display area A but also the peripheral area B, a specific portion will not be overheated, so that damage to the transparent base material 10 can be prevented.

<Modification of the first embodiment>
Although the second power supply main line 412 and the second ground main line 422 are configured to have two linear parts 412A and 422A, this configuration may be applied only to either one, or the first It may be applied to the power main line 411 and the first ground main line 421.
Furthermore, the number of linear portions 412A, 422A may be three or more. Moreover, the intermediate connection part may be omitted.

[Second embodiment]
The transparent display device 1B of the second embodiment shown in FIGS. 5 and 6 differs in configuration from the transparent display device 1 of the first embodiment in the following points. That is, first and second power supply main lines 411, 412, first and second power supply branch lines 413, 414, first and second ground main lines 421, 422, first and second ground branch lines 423 , 424 are arranged on different planes in the thickness direction of the transparent base material 10.

As shown in FIGS. 5 and 6, on the main surface of the transparent base material 10, a first power branch line 413, a second power branch line 414, a first main ground line 421, a second main ground line 422, A first ground branch line 423, a second ground branch line 424, a light emitting section 20, and an IC chip 30 are arranged. These are covered with an insulating layer 14.
On the insulating layer 14, a first main power line 411, a second main power line 412, a first branch line 413, and a second branch line 414 are arranged.
The second power supply main line 412 and the first ground branch line 423 are connected through a conductive portion (not shown).

Furthermore, when the plane including the display area A is divided into a plurality of parts, for example, 600 parts, each having the same predetermined area, it is preferable that the variation in the current density of the divided areas is within 10 times the average value. It is preferably within 2 times, and more preferably within 2 times. Here, the current density is the current flowing per unit area on a microplane perpendicular to the current. Further, the variation in the divided regions refers to the variation in the region where the current density is controlled to a desired level, and does not include the variation in the region where a problem such as a disconnection occurs.
If the variation is within 10 times, local heating can be suppressed by heat transfer of the member itself, stress generation due to expansion difference can be suppressed, and as a result, thermal cracking of the glass can be suppressed.

In FIG. 5, the second power main line 412 is arranged so as to pass approximately through the center of the display area A, but the arrangement position within the plane of the display area A is not limited.
In the second embodiment, the first power supply main line 411 and the second power supply main line 412 and the first power supply branch line 413 and the second power supply branch line 414 are arranged on different planes in the thickness direction of the transparent base material 10. It is located. Therefore, compared to the first embodiment in which these elements are arranged on the same plane of the transparent base material 10, the layout can be diversified.

<Modification of the second embodiment>
In the second embodiment, the first main power line 411, the second main power line 412, the first power branch line 413, and the second power branch line 414 are arranged on different planes in the thickness direction of the transparent base material 10. It has the following configuration. In addition to or in place of this configuration, the first main ground line 421, the second main ground line 422, the first ground branch line 423, and the second ground branch line 424 are connected to a plate of the transparent base material 10. They may be arranged on different planes in the thickness direction.

Further, in the second embodiment, the second power branch line 414 and the second ground branch line 424 are formed in the same plane, that is, in a plane located at the same position in the thickness direction of the transparent base material 10. You can. A plurality of second power supply main lines 412 may be arranged on a different plane, and the first power supply branch lines 413 and a grid pattern may be formed in the same plane. Furthermore, the second ground main line 422 and the first ground branch line 423 may be arranged in a grid-like pattern within the display area A on a plane different from these two planes.

[Third embodiment]
A third embodiment will be described based on FIG. 7.
The third embodiment has a configuration in which the transparent display device 1 of the first embodiment is used by being attached to a glass plate, a moving body, etc. using a mounting member such as an adhesive sheet. It can also be used as a laminated glass with a transparent display device by being sealed between two glass plates. Preferably, such a glass plate is transparent.

A laminated glass 100F with a transparent display device according to the third embodiment shown in FIG. It is equipped with The first glass plate 101F is a transparent plate material arranged on the surface of the transparent base material 10 opposite to the surface on which the light emitting section 20 and the wiring section 40 are provided.
The second glass plate 102F is made by joining two glass plates 10E with a second adhesive layer 104F.

In order to manufacture the transparent display device 1, the transparent display device 1 is placed on the first glass plate 101F via the first adhesive layer 103F, and the glass plate 10E is further placed on the transparent display device 1. , the glass plate 10E is placed via the second adhesive layer 104F. Thereby, the transparent display device 1 can be stabilized within the transparent display device-equipped laminated glass 100F.

The first glass plate 101F and the second glass plate 102F may be either inorganic glass or organic glass. Examples of the inorganic glass include soda lime glass.
The thickness of both the first glass plate 101F and the second glass plate 102F is preferably 0.5 mm or more and 5 mm or less, and more preferably 1.5 mm or more and 2.5 mm or less. Note that the material, structure, and thickness of the first glass plate 101F and the second glass plate 102F may be the same or different.

Examples of materials for the first adhesive layer 103F and the second adhesive layer 104F include intermediate films containing cycloolefin copolymer (COP), vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), or the like as a main component. The first adhesive layer 103F and the second adhesive layer 104F are provided on the entire surface or a part of the transparent display device 1.

The laminated glass 100F with a transparent display device is not limited to a flat surface, and may have a curved surface. That is, the transparent display device attached laminated glass 100F may be curved. This curve may be in one direction, or may be curved in two directions, a first direction and a second direction perpendicular to the first direction.

When obtaining a curved laminated glass 100F with a transparent display device, the transparent display device 1 is placed on a first glass plate 101F that has been subjected to a bending process, and a second glass plate 102F that has been subjected to a bending process is stacked thereon, and then heated. , pressure treated. Thereby, a curved laminated glass 100F with a transparent display device is obtained. Note that if the second glass plate 102F is sufficiently thinner than the first glass plate 101F, the second glass plate 102F does not need to be curved in advance.

The laminated glass 100F with a transparent display device can be suitably used in applications where the viewing distance (distance from the observer to the display screen) is, for example, 0.25 m or more and 4.0 m or less. Specific applications include use in moving objects such as automobiles, vehicles such as railroad cars, airplanes, buildings, transparent casings, and the like. For example, window glass such as the front window, rear window, and side window of automobiles, window glass of other means of transportation such as trains, medium-print advertisements, and windows of store show windows, showcases, and display shelves with doors, etc. Can be mentioned. The laminated glass 100F with a transparent display device can be incorporated into at least a part of them.

In this way, even if the laminated glass 100F with a transparent display device is used in an application where the viewing distance is relatively short, the display can be easily It is possible to ensure transparency that allows the image on the back side to be viewed while maintaining the performance.

[Fourth embodiment]
A fourth embodiment will be described based on FIGS. 8 and 9.
An automobile 110H as a moving object according to the fourth embodiment shown in FIG. 8 includes a curved laminated glass 100F with a transparent display device as a windshield.

As shown in FIG. 9, the laminated glass 100F with a transparent display device constituting the windshield includes a concealing layer 101H provided on its outer periphery. The concealing layer 101H is provided inside the vehicle and has the function of hiding the inside of the vehicle from the outside of the vehicle. Further, the transparent display device 1 is formed smaller than the windshield, and is enclosed in a part of the lower left side when viewed from inside the vehicle. The area where the transparent display device 1 is provided may be 50% or less, or 30% or less of the area of the windshield.

<Modification of the fourth embodiment>
The size of the transparent display device 1 may be approximately the same size as the windshield.

[Fifth embodiment]
A fifth embodiment will be described based on FIG. 10.
As shown in FIG. 10, the transparent display device 1C includes a transparent base material 10, a light emitting section 20, a wiring section 40, and a control section (not shown).
The display area A of the transparent display device 1B includes a light emitting section 20 and a wiring section 40 when viewed in a plan view.
A plurality of light emitting units 20 are arranged in a straight line along the row direction (X direction in the drawing) in the display area A, and the plurality of light emitting units 20 arranged on these straight lines are arranged in two columns. has been done.

The wiring section 40 includes a power line 41 and a ground line 42, each of which is a linear body. The power line 41 and the ground line 42 are arranged in the same plane.
The power line 41 includes a main power line 410 and a power branch line 415. The main power line 410 is connected to a control section (not shown) and is arranged along the row direction (X direction) on both sides of the two columns of light emitting sections 20. The power branch lines 415 extend in the vertical direction (column direction) from multiple locations on the main power line 410 and are connected to the light emitting sections 20, respectively.
The ground line 42 includes a first main ground line 421 , a second main ground line 422 , and a ground branch line 425 . The first main ground line 421 is connected to a control section (not shown) and extends in the vertical direction (Y direction). The second main ground line 422 extends from the middle of the first main ground line 421 in the left direction (row direction). The ground branch lines 425 extend upward (in the column direction) from multiple locations on the second main ground line 422 and are connected to the light emitting sections 20, respectively.

The second main ground line 422 has two linear portions 422A that face each other and a linear connection portion 422B that connects the opposing portions of the linear portions 422A. The two linear parts 422A are connected at their base ends to the first main ground line 421, so that a part of the first main ground line 421, the two linear parts 422A, and the connecting part 422B are connected to each other. It is said to be circular.
In FIG. 10, the connecting portion 422B is only a linear tip connecting portion 422C that connects the tips of the two linear portions 422A, but a line connecting the intermediate portion or the end of the linear portion 422A is shown. A shaped intermediate connection may also be provided.
The power supply main line 410 and the ground line 42 have the same width dimension.

In this embodiment, as in the first embodiment, the wiring section 40 has a variation in the average value of the product of the reciprocal of the cross-sectional area per unit area and the length in n areas obtained by dividing the display area A. It is within 30%. Here, as described above, abnormal values in areas where no light is emitted due to defects such as wire breakage are not included in the range of variation.

[Sixth embodiment]
A sixth embodiment will be described based on FIG. 11.
The sixth embodiment differs from the fifth embodiment in the shape of the ground line 42.
As shown in FIG. 11, the transparent display device 1D includes a transparent base material 10, a light emitting section 20, a wiring section 40, and a control section (not shown).

The ground line 42 includes a first main ground line 421, a second main ground line 422, and a ground branch line 425.
The first main ground line 421 has two linear portions 421A that oppose each other and a linear intermediate connection portion 421D that connects intermediate portions of these linear portions 421A.
The second main ground line 422 has linear portions 422A that face each other and have their base ends connected to the linear portion 421A. Further, in the fifth embodiment, the tips of the linear portions 422A facing each other, that is, the ends opposite to the ends to which the linear portions 421A are connected, and the intermediate portions of the linear portions 422A facing each other are connected. A linear intermediate connection may also be provided.
The power supply main line 410 and the ground line 42 have the same width dimension.

In this embodiment, as in the first embodiment, the wiring section 40 has a variation in the average value of the product of the reciprocal of the cross-sectional area per unit area and the length in n areas obtained by dividing the display area A. It is within 30%. In the sixth embodiment as well, abnormal values in areas where no light is emitted due to a malfunction are not included in the range of variation.

<Other variations>
In other embodiments of the present invention, the first to sixth embodiments and modifications may be combined as necessary to the extent possible.

This application claims priority based on Japanese Patent Application No. 2019-054428 filed on March 22, 2019, and the entire disclosure thereof is incorporated herein.

DESCRIPTION OF SYMBOLS 1, 1B, 1C... Transparent display device, 10... Transparent base material, 14... Insulating layer, 20... Light emitting part, 30... IC chip, 40... Wiring part, 41... Power supply line, 410... Main power supply line, 411... First 412...second power supply main line, 412A, 421A, 422A...linear section, 412B...connection section, 412C...tip connection section, 412D, 421D...intermediate connection section, 60...control section, 70...for connection Wiring section, 71...first wiring section, 72...second wiring section, A...display area, B...peripheral area

Claims (10)

a transparent base material,
a plurality of light emitting units arranged for each pixel on the transparent base material and forming a display area ;
a wiring section connected to each of the light emitting sections;
A transparent display device comprising an electric circuit board, a control section that supplies current to the light emitting section through the wiring section, and a control section from which the current returns from the light emitting section,
Each of the light emitting parts includes a light emitting diode having an area of 1 mm ² or less,
The value of the product (Vn=Ln/Dn) of the reciprocal (1/Dn) of the cross-sectional area (Dn) perpendicular to the longitudinal direction of the wiring section determined for each pixel and the length (Ln) along the longitudinal direction. , a variation of the product value determined for each pixel in the entire display area with respect to an average value is within 30%,
In the display area, the area of the region where the transmittance of visible light is 20% or less is 60% or less,
The wiring section includes a power line that supplies current from the control section to the light emitting section,
The power line includes a main power line extending in a first direction, and a light emitting line branching from the main power line and extending in a second direction perpendicular to the first direction , and arranged for each pixel. Equipped with multiple power supply branch lines connected to each section,
The power supply main line has a pair of linear parts extending parallel to the first direction and having a proximal end connected to the control unit, and a pair of linear parts extending parallel to the second direction and having a proximal end connected to the control unit. It has a plurality of connecting parts that connect the linear parts of the wire to each other, and is formed in a ladder shape,
Each of the plurality of connection parts is connected to each of the plurality of power branch lines,
The area of the pixel is 0.01 mm ² or more and 25 mm ² or less,
The wiring section arranged in each of the pixels in the entire display area has the same wiring pattern and includes the power branch line and a ground branch line arranged in parallel with the power branch line,
The interval between the power branch line and the ground branch line within the pixel is 10 μm or more,
The distance between the power branch line and the ground branch line that are adjacent to each other in the pixels that are adjacent to each other in the first direction is also 10 μm or more;
A transparent display device characterized by: 2. The transparent display device according to claim 1, wherein the main power line and the branch line are arranged in a plane at the same position in the thickness direction of the transparent base material. 2. The transparent display device according to claim 1, wherein the main power line and the branch line are arranged on different planes in the thickness direction of the transparent base material. 4. The wiring section according to claim 1, wherein, in the wiring section disposed in the display area, the variation in current density for each pixel is within 10 times the average value of the current density for each pixel in the entire display area. The transparent display device according to any one of the items. The plurality of connecting portions include a tip connecting portion that connects the tip portions of the pair of linear portions,
The transparent display device according to any one of claims 1 to 4. 6. The transparent base material is provided with an insulating member that insulates the light emitting part and the wiring part, and the insulating member is made of a halogen-free material. Transparent display device. A transparent plate material is arranged on the opposite side of the transparent base material with the light emitting part and the wiring part interposed therebetween, and the light emitting part and the wiring part are sandwiched between the transparent plate material and the transparent base material. 7. The transparent display device according to any one of 1 to 6. The glass plate with a transparent display device according to claim 1, wherein the transparent base material includes a glass plate that is assembled to a moving body. The transparent display device according to any one of claims 1 to 7,
a glass plate on which the transparent base material is placed;
A laminated glass with a transparent display device, comprising: another glass plate that sandwiches the transparent display device with the glass plate. A moving body comprising the transparent display device according to any one of claims 1 to 7.

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