Transmission type LED display

Abstract

Provided is a transmission-type LED display capable of suppressing leakage of light irradiated when an LED is turned on to the opposite side of a transparent substrate. A plurality of LEDs (15, 25) are respectively disposed on a first surface of a transparent substrate (1) and a second surface on the opposite side of the first surface, an electrode (22) of the second surface is disposed in a second surface blocking region, an electrode (12) of the first surface is disposed in a first surface blocking region, and the second surface blocking region includes a region blocking an optical path (LP1) in a direction from the LEDs (15) disposed on the first surface toward the transparent substrate (1). The first surface blocking region includes a region blocking an optical path (LP2) in a direction from the LEDs (25) disposed on the second surface toward the transparent substrate (1), so that light irradiated in a direction from the back surfaces of the LEDs (15) on the first surface toward the transparent substrate (1) is blocked by the electrodes (22) on the second surface. Light irradiated in the direction from the back surface of the LED (25) on the second surface toward the transparent substrate (1) is blocked by the electrode (12) on the first surface.

Description

TECHNICAL FIELD

[0001] The present application relates to a transmissive LED display, and more particularly to a display in which a plurality of LEDs are arranged between a plurality of electrodes arranged in an array on a transparent substrate, and a plurality of opening portions are provided in which no electrodes are arranged, so that light is transmitted through the opening portions. BACKGROUND

[0002] In the past, a transmissive display that is different from a general display and is formed so as to be able to see through the back has been known. The transmissive display is formed by arranging a plurality of light sources in an array on a transparent substrate, and providing a plurality of opening portions in which no electrodes or the like are arranged, so that light is transmitted from the back to the surface of the display through the opening portions. The ratio of the area of the opening portion to the area of one pixel is called the aperture ratio, and the greater the aperture ratio, the more background light can be taken in, and a display that is close to transparent in appearance can be obtained.

[0003] Among various types of transmissive displays, a transmissive LED display can achieve a high transmittance of 70% or more, and thus is expected to be applied to various uses. In the case of configuring a transmissive LED display, it is preferable to use a technology called micro LED, in which LEDs that serve as light sources are miniaturized and arranged in an array. For example, a display using micro LED is disclosed in Patent Literature 1.

[0004] However, in the case of configuring a transmissive LED display using micro LED, as shown in FIG. 1, there is a problem that light emitted from the LED 100 in order to project information onto the display surface leaks to the back side of the transparent substrate 103 from the gap between the anode electrode 101 and the cathode electrode 102. In the transmissive LED display, the substrate arranged on the back side of the LED 100 is also configured by the transparent substrate 103, and thus if the LED 100 is lit, light leaks from the back of the LED 100 to the back side of the display through the gap of the electrodes 101, 102. Figure 5

[0005] In addition, a display device in which light from the back of a light emitting element chip is taken to the front has been known (for example, refer to Patent Literature 2). In the display device described in Patent Literature 2, an LED chip is provided on a circuit substrate, and the wiring pattern of the circuit substrate is configured by a material having light reflectivity, such as aluminum. By providing a part of the wiring pattern having light reflectivity as a chip mounting layer, the light emitting element chip is directly mounted on the chip mounting layer, so that light from the back side of the light emitting element chip can be taken to the front with a simple configuration.

[0006] Prior Art Documents:

[0007] Patent Literature:

[0008] ​Patent Literature 1: Japanese Patent Application Laid-Open No. 2021-52156

[0009] Patent Literature 2: Japanese Patent Application Laid-Open No. 2012-204370 SUMMARY

[0010] Problems to be Solved by the Invention

[0011] The present application has been achieved in order to solve the above-described problems, and has an object to be able to suppress a case where light emitted when an LED is lit leaks to the opposite side of a transparent substrate in a transmissive LED display.

[0012] Means for Solving the Problems

[0013] In order to solve the above-described problems, the present application is a transmissive LED display in which a plurality of LEDs are arranged between a plurality of groups of electrodes arranged in an array on a transparent substrate, and a plurality of opening portions in which no electrode is arranged are provided on the transparent substrate, whereby light is able to be transmitted through the plurality of opening portions, wherein a plurality of LEDs are arranged on a first surface of the transparent substrate and a second surface opposite the first surface, electrodes of the second surface are arranged in a second surface shielding region, and electrodes of the first surface are arranged in a first surface shielding region, the second surface shielding region including a region that shields a light path in a direction in which light is emitted from an LED arranged on the first surface toward the transparent substrate, and the first surface shielding region including a region that shields a light path in a direction in which light is emitted from an LED arranged on the second surface toward the transparent substrate.

[0014] Effects of the Invention

[0015] According to the present application configured as described above, in the transmissive LED display, when the LED of the first surface is lit, light emitted in a direction from the back of the LED of the first surface toward the transparent substrate is shielded by the electrode of the second surface, and when the LED of the second surface is lit, light emitted in a direction from the back of the LED of the second surface toward the transparent substrate is shielded by the electrode of the first surface, and thus it is possible to suppress a case where the emitted light of the LED leaks to the opposite surface of the transparent substrate. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a diagram schematically showing an example of LED arrangement of the transmissive LED display of the present embodiment.

[0017] Figure 2 is a diagram showing an example of cross-sectional configuration of the LED arrangement structure of the transmissive LED display of the present embodiment.

[0018] Figure 3 is a diagram showing another example of cross-sectional configuration of the LED arrangement structure of the transmissive LED display of the present embodiment.

[0019] Figure 4 is a view showing another cross-sectional configuration example of the LED configuration structure of the transmissive LED display of the present embodiment.

[0020] Figure 5 is a view showing the structure of the light emitting portion of the transmissive LED display.

[0021] Explanation of Reference Signs:

[0022] 1 transparent substrate

[0023] 11, 21 anode electrode

[0024] 12, 22 cathode electrode

[0025] 15, 25 LED

[0026] 16, 26 reflective material

[0027] 10R, 10G, 10B sub-pixel of the first surface

[0028] 20R, 20G, 20B sub-pixel of the second surface

[0029] 30 opening portion of the first surface

[0030] 40 opening portion of the second surface DETAILED DESCRIPTION

[0031] Hereinafter, one embodiment of the present application will be described with reference to the drawings. Figure 1 and Figure 2 is a view showing an example of the LED configuration structure of the transmissive LED display of the present embodiment. Figure 1 The LED configuration structure of the transmissive LED display is schematically shown in a state of being observed from above the transparent substrate 1 (first surface side described later). In the present embodiment, as an example, a configuration example of the transmissive LED display using micro LED elements is shown.

[0032] As shown in Figure 1 , the transmissive LED display of the present embodiment is a display in which a plurality of LEDs 15 are arranged between a plurality of electrodes (not shown in the drawing) arranged in an array on a transparent substrate 1 and a plurality of opening portions 30 not provided with electrodes are provided on the transparent substrate 1, so that light can be transmitted through the plurality of opening portions 30. Thereby, the background light is transmitted from the back of the display to the near front side, and the background of the display can be seen from the near front side.

[0033] In the LED configuration shown in Figure 1 , one pixel 10 is composed of three sub-pixels (red LED, green LED, and blue LED) each of which has an LED 15 (red LED, green LED, and blue LED) for each RGB. Figure 2The adjacent sub-pixels 10R, 10G, 10B and the adjacent pixels 10 become openings 30, respectively. Note that although the example in which the three LEDs 15 of RGB are arranged in one pixel 10 is shown in this example, the example in which one LED 15 is arranged in one pixel without sub-pixels can be employed.

[0034] Figure 2 FIG. 2 is a diagram showing a cross-sectional example when the LED arrangement structure of the present embodiment is viewed from the side. The upper side of the drawing is the first surface of the transparent substrate 1, and the lower side of the drawing is the second surface of the transparent substrate 1.

[0035] As shown in FIG. 2, in the transmissive LED display of the present embodiment, a plurality of LEDs 15, 25 are arranged in the first surface and the second surface of the transparent substrate 1, respectively. Figure 2 Figure 2 The LED arrangement structure of one pixel is shown. In the first surface, one pixel includes a plurality of sub-pixels 10R, 10G, 10B corresponding to red light emission, green light emission, and blue light emission, and the LEDs 15 are arranged in each of the sub-pixels 10R, 10G, 10B. The same applies to the second surface, and one pixel includes a plurality of sub-pixels 20R, 20G, 20B, and the LEDs 25 are arranged in each of the sub-pixels 20R, 20G, 20B.

[0036] The sub-pixels 10R, 10G, 10B of the first surface are arranged at a predetermined interval on the transparent substrate 1 with one set of anode electrodes 11 and cathode electrodes 12 arranged therebetween, and the LEDs 15 are arranged and electrically connected between the electrodes 11, 12. Figure 2 In the example shown in FIG. 3, the LEDs 15 are mounted via the bumps 14 with respect to the bonding material 13 formed on the electrodes 11, 12. The openings 30 in which the electrodes 11, 12 are not arranged are provided between the adjacent sub-pixels 10R, 10G, 10B.

[0037] The second surface of the transparent substrate 1 is also configured in the same manner as the first surface. That is, the sub-pixels 20R, 20G, 20B of the second surface are arranged at a predetermined interval on the transparent substrate 1 with one set of anode electrodes 21 and cathode electrodes 22 arranged therebetween, and the LEDs 25 are arranged and electrically connected between the electrodes 21, 22. Figure 2 In the example shown in FIG. 4, the LEDs 25 are mounted via the bumps 24 with respect to the bonding material 23 formed on the electrodes 21, 22. The openings 40 in which the electrodes 21, 22 are not arranged are provided between the adjacent sub-pixels 20R, 20G, 20B.

[0038] ​In the present embodiment, the cathode electrode 22 of the second surface is arranged in the second surface shielding region including a region that shields the light path LP1 (shown by a dotted arrow) toward the transparent substrate 1 from the back surface of the LED 15 arranged in the first surface, and the cathode electrode 12 of the first surface is arranged in the first surface shielding region including a region that shields the light path LP2 (shown by a dotted arrow) toward the transparent substrate 1 from the back surface of the LED 25 arranged in the second surface.

[0039] That is, the cathode electrode 12 (the electrode of one side in the claim) of each sub-pixel 10R, 10G, 10B of the first surface is arranged in the first surface shielding region opposite to each sub-pixel 20R, 20G, 20B of the second surface. Further, the cathode electrode 22 (the electrode of one side) of each sub-pixel 20R, 20G, 20B of the second surface is arranged in the second surface shielding region opposite to each sub-pixel 10R, 10G, 10B of the first surface.

[0040] The second surface shielding region including the region that shields the light path LP1 means that it is sufficient to include at least the region that shields the light path LP1 (the region of the second surface opposite to the region of the first surface that blocks between the electrodes 11, 12), and can be a region equal in size to the region that shields the light path LP1 or a region larger than it. Similarly, the first surface shielding region including the region that shields the light path LP2 means that it is sufficient to include at least the region that shields the light path LP2 (the region of the first surface opposite to the region of the second surface that blocks between the electrodes 21, 22), and can be a region equal in size to the region that shields the light path LP2 or a region larger than it. Figure 2 An example in which a region equal in size to the region that shields the light paths LP1, LP2 is set as the first surface shielding region and the second surface shielding region is shown in FIG. 6.

[0041] With such an LED arrangement structure, the light along the light path LP1 that is emitted toward the transparent substrate 1 from the back surface of the LED 15 of the first surface when the LED 15 of the first surface is lit is shielded by the cathode electrode 22 of the second surface. Further, the light along the light path LP2 that is emitted toward the transparent substrate 1 from the back surface of the LED 25 of the second surface when the LED 25 of the second surface is lit is shielded by the cathode electrode 12 of the first surface. Therefore, it is possible to suppress the case where the emitted light of the LEDs 15, 25 leaks to the opposite surface of the transparent substrate 1.

[0042] The anode electrodes 11 (the electrodes of the other party in the claims) of the sub-pixels 10R, 10G, 10B of the first surface are arranged in a first surface region including a region (a region facing the opening portions 40 of the second surface) that does not face the sub-pixels 20R, 20G, 20B of the second surface. Further, the anode electrodes 21 (the electrodes of the other party) of the sub-pixels 20R, 20G, 20B of the second surface are arranged in a second surface region including a region (a region facing the opening portions 30 of the first surface) that does not face the sub-pixels 10R, 10G, 10B of the first surface.

[0043] In Figure 2 In the example shown, the first surface region in which the anode electrodes 11 of the first surface are arranged includes a region facing the entire region of the opening portions 40 formed between the sub-pixels 20R, 20G, 20B of the second surface. Further, the second surface region in which the anode electrodes 21 of the second surface are arranged includes a region facing the entire region of the opening portions 30 formed between the sub-pixels 10R, 10G, 10B of the first surface.

[0044] The first surface region including the region facing the entire region of the opening portions 40 means that it is sufficient to include at least the region facing the entire region of the opening portions 40, and can be a region having the same size as the region or a region larger than the region. Similarly, the second surface region including the region facing the entire region of the opening portions 30 means that it is sufficient to include at least the region facing the entire region of the opening portions 30, and can be a region having the same size as the region or a region larger than the region. Figure 3 An example in which regions having the same size as the regions facing the entire regions of the opening portions 30, 40 are set as the first surface region and the second surface region is shown in

[0045] By so configuring, light that leaks from the back of the LED 15 of the first surface to outside the sub-pixels 10R, 10G, 10B when the LED 15 of the first surface is lit is blocked by the anode electrodes 21 of the second surface. Further, light that leaks from the back of the LED 25 of the second surface to outside the sub-pixels 20R, 20G, 20B when the LED 25 of the second surface is lit is blocked by the anode electrodes 11 of the first surface. Thus, it is possible to more effectively suppress the case where the irradiation light of the LEDs 15, 25 leaks to the opposite surface of the transparent substrate 1.

[0046] Further, as Figure 3As shown, the region of the first surface where the anode electrode 11 is disposed can be set as a region opposite to a portion of the opening 40 of the second surface, and the region of the second surface where the anode electrode 21 is disposed can be set as a region opposite to a portion of the opening 30 of the first surface. In this way, the leakage of light that sometimes leaks from the back of the LEDs 15 and 25 to the opposite side of the transparent substrate 1, other than the sub-pixels 10R, 10G, 10B, 20R, 20G, and 20B, can be suppressed to a certain extent, and the aperture ratio of the transmissive LED display can be increased to increase the transparency. Figure 4 The example shown is that the area larger than the area that blocks the light paths LP1 and LP2 is used as the first and second blocking areas (example where the size of the cathode electrodes 12 and 22 is larger than the area that blocks the light paths LP1 and LP2).

[0047] Alternatively, the electrodes disposed in the first and second occlusion regions can be configured in a manner opposite to the described embodiment. That is, the anode electrode 11 of the first surface can be disposed in the first occlusion region opposite to the sub-pixels 20R, 20G, and 20B of the second surface, and the cathode electrode 12 can be disposed in the first surface region including the area not opposite to the sub-pixels 20R, 20G, and 20B of the second surface. On the other hand, the anode electrode 21 of the second surface can be disposed in the first occlusion region opposite to the sub-pixels 10R, 10G, and 10B of the first surface, and the cathode electrode 22 can be disposed in the second surface region including the area not opposite to the sub-pixels 10R, 10G, and 10B of the first surface.

[0048] In addition, such as Figure 4 As shown, a reflective material 16 with light reflectivity can also be disposed between each group of electrodes 11, 12 on the first surface, and a reflective material 26 can be disposed between each group of electrodes 21, 22 on the second surface. Figure 4 The diagram shows an example where reflective material 16 is disposed in the region blocking the electrodes 11 and 12 on the first surface, and reflective material 26 is disposed in the region blocking the electrodes 21 and 22 on the second surface. However, it is not necessary for reflective materials 16 and 26 to be disposed in completely blocked regions.

[0049] Through such ​ By configuring the reflective materials 16 and 26 in this way, light LP1, which travels from the back of the LED 15 on the first surface towards the transparent substrate 1, is reflected towards the information display surface of the first surface, and light LP2, which travels from the back of the LED 25 on the second surface towards the transparent substrate 1, is reflected towards the information display surface of the second surface, thereby improving light utilization efficiency. Furthermore, the cathode electrodes 12 and 22 on the first and second surfaces can be used to block light that is sometimes transmitted through the reflective materials 16 and 26.

[0050] Further, in the above-described embodiments, the configuration of the transmissive LED display using the micro LED element is described, but is not limited thereto. That is, for the transmissive LED display having a structure in which the irradiation light of the LED leaks from the gap between the electrodes, the LED arrangement structure of the present embodiment can be applied.

[0051] Further, the above-described embodiments are merely one example of the embodiment of the present application, and the technical scope of the present application is not limited by the above-described embodiments. That is, the present application can be implemented in various forms without departing from the spirit or main features thereof.

Claims

1. A transmissive LED display, comprising multiple LEDs arranged in an array between multiple groups of electrodes on a transparent substrate, and multiple openings on the transparent substrate not having the electrodes disposed therein, thereby enabling light to be transmitted through the multiple openings, characterized in that, The plurality of LEDs are respectively disposed on a first surface and a second surface opposite to the first surface of the transparent substrate. Electrodes of the second surface are disposed in a second surface shading region and electrodes of the first surface are disposed in a first surface shading region. The second surface shading region includes a region that blocks the light path from the LEDs disposed on the first surface toward the transparent substrate, and the first surface shading region includes a region that blocks the light path from the LEDs disposed on the second surface toward the transparent substrate.

2. The transmissive LED display according to claim 1, characterized in that, A reflective material with light reflectivity is disposed between each group of electrodes on the first surface, and the same reflective material is disposed between each group of electrodes on the second surface.

3. The transmissive LED display according to claim 1 or 2, characterized in that, One pixel contains multiple sub-pixels, and each of these sub-pixels is configured with the aforementioned LEDs. For each set of electrodes disposed on the first surface, one electrode is disposed in the first surface occlusion area opposite to the sub-pixels of the second surface, and the other electrode is disposed in the first surface area including the area not opposite to the sub-pixels of the second surface. For each set of electrodes disposed on the second surface, one electrode is disposed in the second surface occlusion area opposite to the sub-pixel of the first surface, and the other electrode is disposed in the second surface area including the area not opposite to the sub-pixel of the first surface.

4. The transmissive LED display according to claim 3, characterized in that, The region on the first surface where the other electrode is disposed includes the region opposite to the entire region of the opening formed between the sub-pixels on the second surface. The second surface region on which the other electrode is disposed is a region that includes the entire region opposite to the opening formed between the sub-pixels of the first surface.

5. The transmissive LED display according to claim 3, characterized in that, The region on the first surface where the other electrode is disposed is a region opposite to a portion of the opening formed between the sub-pixels on the second surface. The second surface region on which the other electrode is disposed is a region opposite to a portion of the opening formed between the sub-pixels of the first surface.

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