Display device

Abstract

A transparent double-sided display is a display device in which a first transparent display and a second transparent display are connected, the first transparent display comprising a first transmission area that allows background light to pass through and a first non-transmission area that has a light-emitting element and does not allow the background light to pass through, wherein the light-emitting element performs an externally arranged information display, the second transparent display comprising a second transmission area that allows background light to pass through and a second non-transmission area that has a light-emitting element and does not allow the background light to pass through, wherein the light-emitting element performs an externally arranged information display.wherein an area of ​​at least one second non-transmission area of ​​the second transparent display is smaller than an area of ​​the first non-transmission area that overlaps the at least one second non-transmission area, and the connection is such that the at least one second non-transmission area is obscured by the first non-transmission area when the display device is viewed with respect to the first transparent display.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a display device. TECHNICAL BACKGROUND

[0002] A transparent display that displays information on a window or shop window has been practically applied. Through such a transparent display, the background can be seen while displaying information, thus reducing the installation location of the display.

[0003] Recently, a transparent double-sided display capable of displaying different information on a front and back side while transmitting a background by bonding two such transparent displays together has been developed (e.g., Patent Document 1). QUOTATION LISTPatent literature

[0004] Patent Document 1: JP 2021-82733 A SUMMARY OF THE INVENTION

[0005] Such a transparent double-sided display should ensure high permeability.

[0006] The object of the present disclosure is to provide a display device that ensures high transmittance when two transparent double-sided displays are bonded together.

[0007] A display device according to the present disclosure is a display device in which a first transparent display and a second transparent display are connected to each other, the first transparent display includes a first transmission region that transmits backlight and a first non-transmission region that has a light-emitting element and that does not transmit the backlight, wherein the light-emitting element performs externally arranged information display, the second transparent display includes a second transmission region that transmits backlight and a second non-transmission region that has a light-emitting element and that does not transmit the backlight, wherein the light-emitting element performs externally arranged information display,wherein an area of ​​at least one second non-transmission area of ​​the second transparent display is smaller than an area of ​​the first non-transmission area that overlaps the at least one second non-transmission area, and the connection is performed such that the at least one second non-transmission area is obscured by the first non-transmission area when viewing the display device with respect to the first transparent display. EFFECT OF THE INVENTION

[0008] According to a mobile structure of a display device and a display device of the present disclosure, high transmittance can be ensured when two transparent double-sided displays are bonded together. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a diagram for explaining the function of a transparent double-sided display according to a first embodiment; Fig. Figure 1B is a diagram illustrating an example of information observed by an observer from each side of the transparent double-sided display; Fig. 2A is a diagram illustrating an example of a case where information is displayed on a transparent display; Fig. 2B is a diagram for explaining a disadvantage of a conventional transparent double-sided display; Fig. 3 is a diagram showing a schematic structure of the transparent double-sided display according to the first embodiment; Fig. 4A is a first diagram showing an operation example of the transparent double-sided display according to the first embodiment; Fig. 4B is a second diagram showing an operation example of the transparent double-sided display according to the first embodiment; Fig. 5 is a diagram illustrating an example of a result of simulating a change in transmittance due to a misalignment occurring at the time of bonding between the transparent double-sided display according to the first embodiment and a transparent double-sided display of a comparative example; Fig. 6 is a diagram showing an example in which the display areas are formed in a lattice shape; Fig. 7 is a diagram showing an example in which display areas are formed in a dotted shape; Fig. 8A is a first diagram showing a schematic structure of a first transparent display and a second transparent display according to a second embodiment; Fig. Fig. 8B is a first diagram explaining a relationship between the misalignment and the transmittance that occurs when the first transparent display and the second transparent display are in Fig. 8A are connected to each other; Fig. 9A is a second diagram showing a schematic structure of a first transparent display and a second transparent display according to the second embodiment; Fig. Fig. 9B is a first diagram explaining a relationship between the misalignment and the transmittance that occurs when the first transparent display and the second transparent display are in Fig. 9A are connected to each other; and Fig. 10 is a diagram showing a schematic structure of a transparent double-sided display according to a third embodiment. DESCRIPTION OF THE EMBODIMENTS (First Embodiment)

[0009] Hereinafter, a first embodiment of a display device according to the present disclosure will be described with reference to the drawings. (Transparent double-sided display function)

[0010] The function of a transparent double-sided display 10 is described with reference to the Fig. 1A and Fig. 1B. Fig. 1A is a diagram for explaining the function of a transparent double-sided display according to a first embodiment. Fig. Figure 1B is a diagram illustrating an example of information observed by an observer from each side of the transparent double-sided display.

[0011] The transparent double-sided display 10 has a structure in which a first transparent display 10a and a second transparent display 10b are bonded together. Both the first transparent display 10a and the second transparent display 10b are formed by a display device with a self-emissive display element. The first transparent display 10a and the second transparent display 10b can respectively perform different video displays. Incidentally, the first transparent display 10a and the second transparent display 10b are bonded to each other, for example, by a transparent adhesive used to bond an optical element such as a lens.

[0012] In Fig. 1A shows an example in which the first transparent display 10a performs the video display 8a of “123” and the second transparent display 10b performs the video display 8b of “ABC”.

[0013] As in Fig. As shown in Figure 1B, an observer 5a of the first transparent display 10a can visually observe the video display 8a and the background of the first transparent display 10a. At the same time, an observer 5b of the second transparent display 10b can visually observe the video display 8b and the background of the second transparent display 10b.

[0014] In the case of Fig. 1B, observer 5a visually detects observer 5b in the background of video display 8a because observers 5a and 5b simultaneously view transparent double-sided display 10. Furthermore, observer 5c visually detects observer 5a in the background of video display 8b. (Disadvantage of the conventional transparent double-sided display)

[0015] A disadvantage of the conventional transparent double-sided display is discussed with reference to Fig. 2A and Fig. 2B. Fig. Figure 2A is a diagram showing an example of a case where information is displayed on a transparent display. Fig. Figure 2B is a diagram illustrating a disadvantage of the conventional transparent double-sided display.

[0016] As in Fig. 2A, a first transparent display 10a included in a transparent double-sided display 10 has a configuration in which display regions 12a and transmission regions 12b are alternately arranged in a stripe pattern.

[0017] A display area 12a is an area where a video display is performed. A light-emitting element that generates a video, a drive circuit that performs ON / OFF control of the light-emitting element, a transparent electrode that applies a voltage to the light-emitting element, and other elements are formed in the display area 12a. Details will be described later (see Fig. 3). Since various circuits and elements for generating a video are mounted, the display area 12a is a non-transmitting area that does not transmit the backlight. Furthermore, the display area 12a may include an area where no circuits or elements are mounted. Since these areas transmit the backlight, the display area 12a may transmit some of the backlight. As described above, the display areas 12a are not limited to areas that do not transmit the backlight at all, but are, for example, areas with a lower transmittance than the transmitting areas 12b.

[0018] A transmission area 12b is an area where no circuit elements or the like for the video display are located. Therefore, the transmission area 12b transmits the background light. A viewer can visually perceive the background through the transmission areas 12b.

[0019] In the example of Fig. 2A, the observer can simultaneously visually recognize the video display of “A” displayed in the display areas 12a and the background through the transmission areas 12b.

[0020] The transparent double-sided display 10 is formed by bonding the first transparent display 10a and the second transparent display 10b. Specifically, the bonding is performed such that the display areas 12a and the transmission areas 12b of the first transparent display 10a and the display areas and transmission areas of the first transparent display 10a overlap each other. Note that the structure of the second transparent display 10b is the same as the structure of the first transparent display 10a. When bonding the first transparent display 10a and the second transparent display 10b, misalignment may occur between the first transparent display 10a and the second transparent display 10b.

[0021] In Fig. 2B shows an example in which misalignment in the width direction of the display areas 12a has occurred when the first transparent display 10a and the second transparent display 10b are bonded together. In the case of Fig. In Figure 2B, the second transparent displays 10b are shifted to the left side of the drawing. In this case, the area of ​​the transmission regions 12b is reduced as seen from the perspective of a viewer of the first transparent display 10a. Therefore, the background behind the transmission regions 12b is darker. (Structure of the transparent double-sided display of the embodiment)

[0022] The structure of a transparent double-sided display 10 of a first embodiment will be described with reference to Fig. 3 described. Fig. 3 is a diagram showing a schematic structure of the transparent double-sided display according to the first embodiment.

[0023] The transparent double-sided display 10 of the present embodiment has a structure in which a first transparent display 10a and a second transparent display 10b are connected to each other. Note that the transparent double-sided display 10 is an example of a display device in the present disclosure.

[0024] The first transparent display 10a has a structure in which display regions 12a and transmission regions 12b are alternately arranged in a striped pattern. The widths 13a of the display regions 12a are all the same, and the widths 13b of the transmission regions 12b are all the same. Note that the display regions 12a are an example of a first non-transmission region within the scope of the present disclosure. The transmission regions 12b are an example of a first transmission region within the scope of the present disclosure.

[0025] The second transparent display 10b has a structure in which display regions 14a and transmission regions 14b are alternately arranged in a striped pattern. The widths 15a of the display regions 14a are all equal, and the widths 15b of the transmission regions 14b are all equal. Incidentally, the width 15a of a display region 14a of the second transparent display 10b is smaller than the width 13a of a display region 12a of the first transparent display 10a. At the same time, the width 15b of a transmission region 14b of the second transparent display 10b is larger than the width 13b of a transmission region 12b of the first transparent display 10a. Therefore, the area of ​​the display regions 14a of the second transparent display 10b is smaller than the area of ​​the display regions 12a of the first transparent display 10a. It should be noted that the display regions 14a are an example of a second non-transmission region in the context of the present disclosure.The transmission regions 14b are an example of a second transmission region within the scope of the present disclosure.

[0026] The display areas 12a of the first transparent display 10a and the display areas 14a of the second transparent display 10b are connected to each other so as to overlap when viewed from the transparent double-sided display 10. When viewed from the side of the first transparent display 10a, the display areas 14a of the second transparent display 10b are hidden behind the display areas 12a of the first transparent display 10a.

[0027] As in Fig. 3, in the display area 12a of the first transparent display 10a, transparent electrodes 22a, light-emitting elements 23 and transparent electrodes 22b are stacked and arranged in the named order from the front side in a state where the front side and the back side are sandwiched between glass substrates 21a and 21b.

[0028] Voltages are applied via the transparent electrodes 22a and 22b, causing the light-emitting elements 23 to emit light. The transparent electrodes 22a and 22b represent anodes and cathodes, respectively.

[0029] The light-emitting elements 23 form a video by emitting light themselves. The light-emitting elements 23 are, for example, organic EL elements. It should be noted that a light-emitting element 23, although it is Fig. 3 is not distinguished, has a structure in which, for example, a red light-emitting element emitting red light, a green light-emitting element emitting green light, and a blue light-emitting element emitting blue light are regularly arranged.

[0030] Although in Fig. 3, a circuit comprising, for example, a transistor for driving a light-emitting element 23 is mounted in a display area 12a of the first transparent display 10a.

[0031] For example, LEDs other than organic EL elements can be used as the light-emitting elements 23 used in the display regions 12a of the first transparent display 10a and the display regions 14a of the second transparent display 10b. A display that uses LEDs as the light-emitting elements 23 is called a microLED display. In a microLED display, a red LED, a green LED, and a blue LED are regularly arranged as the light-emitting elements 23. (Operation of the transparent double-sided display of the embodiment)

[0032] The structure of the transparent double-sided display 10 of the first embodiment will be described with reference to FIG. Fig. 4A and Fig. 4B. Fig. 4A is a first diagram showing an operation example of the transparent double-sided display according to the first embodiment. Fig. 4B is a second diagram illustrating an operation example of the transparent double-sided display according to the first embodiment.

[0033] In Fig. 4A shows an example in which "A" is displayed on the first transparent display 10a and "C" is displayed on the second transparent display 10b in the transparent double-sided display 10 according to the first embodiment. In this case, the first transparent display 10a and the second transparent display 10b are connected to each other such that the upper left vertex V1 of the first transparent display 10a and the upper right vertex V4 of the second transparent display 10b coincide with each other, and the upper right vertex V2 of the first transparent display 10a and the upper left vertex V3 of the second transparent display 10b coincide with each other.

[0034] Since, as described above, the display areas 14a of the second transparent display 10b have a smaller width than the display areas 12a of the first transparent display 10a, the "C" displayed on the second transparent display 10b is displayed darker than the "A" displayed on the first transparent display 10a.

[0035] In Fig. 4B shows an example of a case where misalignment has occurred in a direction orthogonal to the display areas 12a when the first transparent display 10a and the second transparent display 10b are bonded to each other in the transparent double-sided display 10 according to the first embodiment.

[0036] The left diagram in Fig. Figure 4B shows an example of a case where the misalignment is large. The right diagram in Fig. Figure 4B shows an example of a case where there is no misalignment.

[0037] In the right diagram of Fig. 4B, since the widths of the display areas 14a of the second transparent display 10b are smaller than the widths of the display areas 12a of the first transparent display 10a, the transmission areas 12b of the first transparent display 10a transmit the backlight over the entire areas, as indicated by arrows in the drawing.

[0038] In addition, the left diagram of Fig. 4B, with the positions of the display areas 14a of the second transparent display 10b shifted, the overlapping positions between the display areas 12a of the first transparent display 10a and the display areas 14a of the second transparent display 10b are shifted. However, since the widths of the display areas 14a of the second transparent display 10b are smaller than the widths of the display areas 12a of the first transparent display 10a, the display areas 14a of the second transparent display 10b remain obscured by the display areas 12a of the first transparent display 10a from the viewpoint of the first transparent display 10a. Therefore, the transmission areas 12b of the first transparent display 10a transmit the backlight over the entire areas, as indicated by arrows in the drawing.Therefore, when the first transparent display 10a and the second transparent display 10b are bonded together, the transparent double-sided display 10 according to the first embodiment maintains the same transmittance even if misalignment occurs along the width direction of the display areas 12a. In other words, even if misalignment occurs when the first transparent display 10a and the second transparent display 10b are bonded together, the brightness of the background viewed through the transparent double-sided display 10 does not change. Moreover, the brightness of the background does not change in either the case where the transparent double-sided display 10 is viewed from the first transparent display 10a side or the second transparent display 10b side. (Transmittance of the transparent double-sided display of the embodiment)

[0039] With reference to Fig. 5, the relationship between the magnitude of the alignment error that occurs when the first transparent display 10a and the second transparent display 10b are bonded together and the transmittance of the first transparent display 10a is described. Fig. 5 is a diagram illustrating an example of a result of simulating a change in transmittance due to a misalignment occurring at the time of bonding between the transparent double-sided display according to the first embodiment and a transparent double-sided display of a comparative example.

[0040] One in Fig. The diagram shown in FIG. 5 illustrates the relationship between the amount of offset between the first transparent display 10a and the second transparent display 10b in the width direction of the display regions 12a and the transmittance of the first transparent display 10a when the first transparent display 10a and the second transparent display 10b are bonded together in the transparent double-sided display 10 of the present embodiment. Incidentally, the width of a display region 12a of the first transparent display 10a is 60 μm, and the width of a transmission region 12b is 40 μm. The width of a display region 14a of the second transparent display 10b is 40 μm, and the width of a transmission region 14b is 60 μm.

[0041] In addition, the Fig. 5 illustrates the relationship between the offset amount between a first transparent display 10a and a second transparent display 10b of the comparative example in the width direction of the display regions 12a and the transmittance of the first transparent display 10a when the first transparent display 10a and the second transparent display 10b are bonded together. Incidentally, the width of a display region 12a of the first transparent display 10a is 60 μm, and the width of a transmission region 12b is 40 μm. The width of a display region 14a of the second transparent display 10b is 60 μm, and the width of a transmission region 14b is 40 μm.

[0042] When the first transparent display 10a and the second transparent display 10b are bonded together without misalignment, both transparent double-sided displays 10 have a transmittance of 40%. When the display regions 12a are misaligned in the width direction, the transmittance decreases in proportion to the magnitude of the alignment error in the comparative example. Note that, in the present embodiment, the state in which the first transparent display 10a and the second transparent display 10b are bonded together without misalignment refers to a state in which bonding is performed such that the center line of a display region 12a in the width direction and the center line of a display region 14a in the width direction coincide with each other.

[0043] Meanwhile, in the transparent double-sided display 10 of the present embodiment, a transmittance of 40% is maintained as long as the offset of a display area 12a in the width direction is less than or equal to 10 μm. When the offset of a display area 12a in the width direction exceeds 10 μm, the transmittance decreases in proportion to the amount of the offset.

[0044] As described above, the transparent double-sided display 10 of the present embodiment has an allowable range for preventing a reduction in transmittance with respect to the misalignment of the display areas 12a in the width direction. In the case of the Fig. In the example shown in Figure 5, this permissible range is ±10 µm.

[0045] According to the transparent double-sided display 10 of the first embodiment, the area of ​​the display regions 12a formed in the first transparent display 10a is larger than the area of ​​the display regions 14a formed in the second transparent display 10b. Therefore, when the same image is displayed on the first transparent display 10a and the second transparent display 10b, the image displayed on the first transparent display 10a is brighter. Therefore, it is desirable to adjust the orientation of the transparent double-sided display 10 depending on the illuminance of the environment in which the transparent double-sided display 10 is used.For example, it is desirable to use the transparent double-sided display 10 such that the first transparent display 10a is directed to the outdoor side where the illuminance of the display panel is high, and the second transparent display 10b is directed to the indoor side where the illuminance of the display panel is low. (Operation and effect of the first embodiment)

[0046] As described above, the transparent double-sided display 10 of the first embodiment is a display device in which the first transparent display 10a and the second transparent display 10b are bonded to each other, the first transparent display 10a includes the transmission regions 12b that transmit the backlight and the display regions 12a that have light-emitting elements and do not transmit the backlight, the light-emitting elements performing externally arranged information display, the second transparent display 10b includes the transmission regions 14b that transmit the backlight and the display regions 14a that include light-emitting elements and do not transmit the backlight, the light-emitting elements performing externally arranged information display,wherein an area of ​​at least one display area 14a of the second transparent display 10b is smaller than an area of ​​a display area 12a that overlaps the display area 14a, and the bonding is performed in such a manner that at least one display area 14a is obscured by a display area 12a when the transparent double-sided display 10 is viewed facing the first transparent display 10a. Therefore, high transmittance can be ensured when the first transparent display 10a and the second transparent display 10b are bonded together.

[0047] In the transparent double-sided display 10 of the first embodiment, the display areas 12a of the first transparent display 10a and the display areas 14a of the second transparent display 10b are each formed in a stripe shape. Therefore, high transmittance can be ensured when the first transparent display 10a and the second transparent display 10b are bonded together.

[0048] Furthermore, in the transparent double-sided display 10 of the first embodiment, a side including the display regions 14a, which has a smaller total area of ​​the display regions 12a and the display regions 14a, is arranged on a side where the ambient illuminance is lower. Therefore, a bright display image is displayed on the first transparent display 10a in which a display image is bright, and a dark display image is displayed on the second transparent display 10b in which a display image is dark, and thus, viewers viewing each display image can view highly visible display images with a brightness appropriate to the environment. (Modification of the first embodiment)

[0049] In the first embodiment, the example in which the display regions 12a and the transmission regions 12b are formed in a striped pattern was described; however, the shape of the display regions 12a and the transmission regions 12b is not limited to the striped pattern. An example in which the display regions 12a and the transmission regions 12b are formed in different shapes will be described below with reference to Fig. 6 and Fig. 7. Fig. 6 is a diagram showing an example in which the display areas are formed in a lattice shape. Fig. 7 is a diagram showing an example in which the display areas are formed in a dotted shape.

[0050] In Fig. 6 shows an example in which "A" is displayed on a first transparent display 30a and "C" is displayed on a second transparent display 30b in a transparent double-sided display 30 according to a modification of the first embodiment. In this case, the first transparent display 30a and the second transparent display 30b are connected to each other such that the upper left vertex V1 of the first transparent display 30a and the upper right vertex V4 of the second transparent display 30b coincide with each other, and the upper right vertex V2 of the first transparent display 30a and the upper left vertex V3 of the second transparent display 30b coincide with each other.

[0051] In the first transparent display 30a, display regions 32a are formed in a vertical and horizontal lattice shape. A display region 32a includes a display region with a width 33a extending along the vertical direction of the first transparent display 30a and a display region with a width 33c extending along the horizontal direction of the first transparent display 30a. A transmission region 32b with a horizontal width 33b and a vertical width 33d is formed in a gap part of the lattice-shaped display region 32a. Note that the display regions 32a are an example of the first non-transmission region in the present disclosure. The transmission regions 32b are an example of the first transmission region within the scope of the present disclosure.

[0052] Furthermore, display regions 34a having a vertical and horizontal lattice shape are formed in the second transparent display 30b. A display region 34a includes a display region having a width 35a extending along the vertical direction of the second transparent display 30b and a display region having a width 35c extending along the horizontal direction of the second transparent display 30b. A transmission region 34b having a horizontal width 35b and a vertical width 35d is formed in a gap part of the lattice-shaped display region 34a. Note that the display regions 34a are an example of the second non-transmission region in the present disclosure. The transmission regions 34b are an example of the second transmission region within the scope of the present disclosure.

[0053] In Fig. 6, the width 35a of a display area 34a of the second transparent display 30b is shorter than the width 33a of a display area 32a of the first transparent display 30a. At the same time, the width 35c of a display area 34a of the second transparent display 30b is shorter than the width 33c of a display area 32a of the first transparent display 30a. Therefore, the area of ​​the display areas 34a of the second transparent display 30b is smaller than the area of ​​the display areas 32a of the first transparent display 30a.

[0054] When the first transparent display 30a and the second transparent display 30b are connected to each other, the lattice-shaped display areas 34a of the second transparent display 30b are hidden behind the lattice-shaped display areas 32a of the first transparent display 30a when viewed from the side of the first transparent display 30a.

[0055] Therefore, when the first transparent display 30a and the second transparent display 30b are bonded together, the transparent double-sided display 30 maintains the same transmittance even if misalignment occurs along a width direction of the vertical and horizontal lattice-shaped stripes. In other words, even if misalignment occurs when the first transparent display 30a and the second transparent display 30b are bonded together, the brightness of the background viewed through the transparent double-sided display 30 does not change. Moreover, the brightness of the background does not change in either case where the transparent double-sided display 30 is viewed from the first transparent display 30a side or the second transparent display 30b side.

[0056] In Fig. 7 shows an example in which "A" is displayed on a first transparent display 40a and "C" is displayed on a second transparent display 40b in a transparent double-sided display 40 according to a modification of the first embodiment. In this case, the first transparent display 40a and the second transparent display 40b are connected to each other such that the upper left vertex V1 of the first transparent display 40a and the upper right vertex V4 of the second transparent display 40b coincide with each other, and the upper right vertex V2 of the first transparent display 40a and the upper left vertex V3 of the second transparent display 40b coincide with each other.

[0057] In the first transparent display 40a, display regions 42a having a rectangular dot shape are formed. The display region 42a includes a plurality of rectangular regions with a width 43a and a height 43c. A transmission region 42b with a lateral width 43b and a vertical width 43d is formed in a gap part of the display region 42a. Note that the display regions 42a are an example of the first non-transmission region in the present disclosure. The transmission regions 42b are an example of the first transmission region within the scope of the present disclosure.

[0058] In the second transparent display 40b, display regions 44a having a rectangular dot shape are formed. The display region 44a includes a plurality of rectangular regions with a width 45a and a height 45c. A transmission region 44b with a horizontal width 45b and a vertical width 45d is formed in a gap part of the display region 44a. Note that the display regions 44a are an example of the second non-transmission region within the scope of the present disclosure. The transmission regions 44b are an example of the second transmission region within the scope of the present disclosure.

[0059] In Fig. 7, the width 45a of each dot included in a display area 44a of the second transparent display 40b is smaller than the width 43a of the display area 42a of the first transparent display 40a. At the same time, the height 45c of a display area 44a of the second transparent display 40b is shorter than the height 43c of a display area 42a of the first transparent display 40a. Therefore, the area of ​​each dot included in the display area 44a of the second transparent display 40b is smaller than the area of ​​each dot included in the display area 42a of the first transparent display 40a.

[0060] When the first transparent display 40a and the second transparent display 40b are connected to each other, all the dots included in the display areas 44a of the second transparent display 40b are hidden behind the dots included in the display area 42a of the first transparent display 40a when viewed from the side of the first transparent display 40a.

[0061] Therefore, when the first transparent display 40a and the second transparent display 40b are bonded together, the transparent double-sided display 40 maintains the same transmittance even if misalignment occurs in the vertical direction or in the horizontal direction of the dots included in the display areas 44a. In other words, even if misalignment occurs when the first transparent display 40a and the second transparent display 40b are bonded together, the brightness of the background viewed through the transparent double-sided display 40 does not change. Moreover, the brightness of the background does not change in either the case where the transparent double-sided display 40 is viewed from the first transparent display 40a side or the second transparent display 40b side.

[0062] Note that the patterns constituting the display regions of the first transparent display and the display regions of the second transparent display are not limited to the examples described here. That is, even in a case other than the lattice-shaped pattern or the dot-shaped pattern, it is only required that the area of ​​the display regions of the second transparent display be formed to be smaller than the area of ​​the display regions of the first transparent display, and that the display regions formed in the second transparent display be hidden when viewed from the first transparent display side when the first transparent display and the second transparent display are bonded to each other. (Operation and effect of the modification of the first embodiment)

[0063] As described above, in the transparent double-sided display 30 of the modification of the first embodiment, the display areas 32a and the display areas 34a are each formed in a lattice shape. Therefore, high transmittance can be ensured when the first transparent display 30a and the second transparent display 30b are bonded together.

[0064] Furthermore, in the transparent double-sided display 40 according to the modification of the first embodiment, the display areas 42a and the display areas 44a are each formed in a dotted shape. Therefore, high transmittance can be ensured when the first transparent display 40a and the second transparent display 40b are bonded together. (Second embodiment)

[0065] Hereinafter, a second embodiment of a display device according to the present disclosure will be described with reference to the drawings. (Structure of the transparent double-sided display of the embodiment)

[0066] The structures of the transparent double-sided displays 50 and 60 of the second embodiment will be described with reference to FIG. Fig. 8A and Fig. 8B and Fig. 9A and Fig. 9B. Fig. 8A is a first diagram showing a schematic structure of a first transparent display and a second transparent display according to the second embodiment. Fig. Fig. 8B is a first diagram explaining the relationship between the offset and the transmittance that occurs when the first transparent display and the second transparent display are in Fig. 8A are connected to each other. Fig. 9A is a second diagram showing a schematic structure of a first transparent display and a second transparent display according to the second embodiment. Fig. Fig. 9B is a first diagram explaining the relationship between the offset and the transmittance that occurs when the first transparent display and the second transparent display are in Fig. 9A are connected to each other.

[0067] In Fig. 8A shows an example of patterns of display regions and transmission regions each formed in a first transparent display 50a and a second transparent display 50b included in the transparent double-sided display 50 according to the second embodiment.

[0068] In the first transparent display 50a and the second transparent display 50b, strip-shaped display regions with exactly the same repeating pattern are formed. The display regions 52a formed in the first transparent display 50a include display regions with a width 53a and display regions with a width 53b that is smaller than the width 53a. In the first transparent display 50a, transmission regions 52b with a width 53c are formed next to the stripes forming the display regions 52a.

[0069] The display regions 54a formed in the second transparent display 50b include display regions with a width 53a and display regions with a width 53b smaller than the width 53a. In the second transparent display 50b, transmission regions 54b with a width 53c are formed adjacent to the stripes forming the display regions 54a.

[0070] The transparent double-sided display 50 is formed by bonding such that the upper left vertex V1 of the first transparent display 50a and the upper right vertex V4 of the second transparent display 50b coincide with each other, and the upper right vertex V2 of the first transparent display 50a and the upper left vertex V3 of the second transparent display 50b coincide with each other. At this point, bonding is performed such that the display areas of the first transparent display 50a with the width 53a and the display areas of the second transparent display 50b with the width 53b overlap each other.

[0071] By connecting the first transparent display 50a and the second transparent display 50b in this manner, as shown in Fig. As shown in FIG. 8B, even if misalignment occurs at the time of bonding the first transparent display 50a and the second transparent display 50b, the amount of backlight transmitted by the transparent double-sided display 50 is constant. That is, even if misalignment occurs at the time of bonding the first transparent display 50a and the second transparent display 50b, the transmittance of the transparent double-sided display 50 is kept constant.

[0072] Next, with reference to Fig. 9A and Fig. 9B describes an example in which a similar function is realized by a pattern other than the stripes.

[0073] In a first transparent display 60a and a second transparent display 60b, which are arranged in the Fig. Strip-shaped display areas with exactly the same repeating pattern are formed in the transparent double-sided display 60 shown in Figure 9A. The display areas 62a formed in the first transparent display 50a include display areas with a width 63a and a height 63c, and display areas with a width 63b smaller than the width 63a and a height 63d smaller than the height 63c. In the first transparent display 60a, a transmission area 62b is formed adjacent to the dots constituting the display areas 62a.

[0074] The display regions 64a formed in the second transparent display 60b include display regions with a width 63a and a height 63c, and display regions with a width 63b smaller than the width 63a and a height 63d smaller than the height 63c. In the second transparent display 60b, a transmission region 64b is formed adjacent to the dots constituting the display regions 64a.

[0075] The transparent double-sided display 60 is formed by connecting such that the upper left vertex V1 of the first transparent display 60a and the upper right vertex V4 of the second transparent display 60b coincide with each other, and such that the upper right vertex V2 of the first transparent display 60a and the upper left vertex V3 of the second transparent display 60b coincide with each other. At this point, the dots of the first transparent display 60a with the width 63a and the dots of the second transparent display 60b with the width 63b overlap each other, and the dots of the first transparent display 60a with the width 63b and the dots of the second transparent display 60b with the width 63a overlap each other.

[0076] By connecting the first transparent display 60a and the second transparent display 60b in this manner, as shown in Fig. As shown in FIG. 9B, even if misalignment occurs at the time of bonding the first transparent display 60a and the second transparent display 60b, the amount of backlight transmitted by the transparent double-sided display 60 is constant. That is, even if misalignment occurs at the time of bonding the first transparent display 60a and the second transparent display 60b, the transmittance of the transparent double-sided display 60 is kept constant. (Operation and effect of the second embodiment)

[0077] As described above, in the transparent double-sided display 50 of the second embodiment, the display regions 52a of the first transparent display 50a and the display regions 54a of the second transparent display 50b have a plurality of repeating patterns of stripes of different sizes, and the areas of the transmission regions 52b formed between the repeating patterns formed by the display regions 52a are equal to the areas of the transmission regions 54b formed between the repeating patterns formed by the display regions 54a. Therefore, even if misalignment occurs at the time of bonding the first transparent display 50a and the second transparent display 50b, the transmittance of the transparent double-sided display 50 can be kept constant.In addition, since the total area of ​​the display regions 52a formed in the first transparent display 50a and the total area of ​​the display regions 54a formed in the second transparent display 50b can be made equal to each other, the brightness of a display image can be made equal between the case where the transparent double-sided display 50 is viewed from the side of the first transparent display 50a and the case where the transparent double-sided display 50 is viewed from the side of the second transparent display 50b.

[0078] Furthermore, in the transparent double-sided display 60 of the second embodiment, the display regions 62a of the first transparent display 60a and the display regions 64a of the second transparent display 60b each have a repeating pattern with a plurality of different sizes, and the total area of ​​the transmission regions 62b formed between the repeating pattern formed by the display regions 62a is equal to the total area of ​​the transmission regions 64b formed between the repeating pattern formed by the display regions 64a. Therefore, even in a case where misalignment occurs at the time of bonding the first transparent display 60a and the second transparent display 60b, the transmittance of the transparent double-sided display 60 can be kept constant.Furthermore, since the total area of ​​the display regions 62a formed in the first transparent display 60a and the total area of ​​the display regions 64a formed in the second transparent display 60b can be made equal to each other, the brightness of a display image can be made equal between the case where the transparent double-sided display 60 is viewed from the first transparent display 60a side and the case where the transparent double-sided display 60 is viewed from the second transparent display 60b side. Note that in . Fig. 9A, only display areas of five rows and five columns are extracted and displayed from the display areas formed in the first transparent display 60a and the second transparent display 60b, respectively. However, since more display areas with a plurality of matrices are actually included, the total area of ​​the display areas 62a formed in the first transparent display 60a is equal to the total area of ​​the display areas 64a formed in the second transparent display 60b.

[0079] Similarly, in the transparent double-sided display 50 of the second embodiment, the display areas 52a of the first transparent display 50a and the display areas 54a of the second transparent display 50b are formed in the same repeating pattern. Therefore, the first transparent display 50a and the second transparent display 50b can be manufactured with the same mask pattern, thereby improving production efficiency.

[0080] Similarly, in the transparent double-sided display 60 of the second embodiment, the display areas 62a of the first transparent display 60a and the display areas 64a of the second transparent display 60b are formed in the same repeating pattern. Therefore, the first transparent display 60a and the second transparent display 60b can be manufactured with the same mask pattern, thereby improving production efficiency. (Third embodiment)

[0081] Hereinafter, a third embodiment of a display device according to the present disclosure will be described with reference to the drawings. (Structure of the transparent double-sided display of the embodiment)

[0082] The structure of a transparent double-sided display 70 of the third embodiment will be described with reference to Fig. 10 described. Fig. 10 is a diagram showing a schematic structure of the transparent double-sided display according to the third embodiment.

[0083] In a typical full-color display, light-emitting regions are formed by three RGB colors, and these light-emitting regions are combined to perform a full-color display. Therefore, to accurately reproduce a color to be displayed, it is desirable to uniform the light emission intensities of the three RGB colors. In this regard, the present embodiment has taken a measure against a case where it is difficult to uniform the light emission intensities of the three RGB colors.

[0084] The transparent double-sided display 70 of the present embodiment has a structure in which a first transparent display 70a and a second transparent display 70b are bonded to each other.

[0085] In the first transparent display 70a, display areas having a rectangular dot shape are formed as described with reference to Fig. 9A. Each of the display regions consists of a light-emitting element that emits light in one of the three RGB colors. It is assumed that the light-emitting element used has a blue light-emitting intensity lower than the red and green light-emitting intensities. In such a case, a blue light-emitting element 72b is formed in the display regions of the first transparent display 70a so that its area is larger than the areas of a red light-emitting element 72r and a green light-emitting element 72g. In addition, a transmission region 72t is formed in gap portions between the display regions.

[0086] Similarly, in the second transparent display 70b, display regions with a rectangular dot shape are also formed. A transmission region 72t is formed in the gaps between the display regions. In the display regions of the second transparent display 70b, a blue light-emitting element 74b is formed such that its area is larger than the areas of a red light-emitting element 74r and a green light-emitting element 74g. Furthermore, a transmission region 74t is formed in the spaces between the display regions.

[0087] The total area of ​​the blue light-emitting elements 72b formed in the first transparent display 70a is equal to the total area of ​​the blue light-emitting elements 74b formed in the second transparent display 70b. Furthermore, the total area of ​​the red light-emitting elements 72r and green light-emitting elements 72g formed in the first transparent display 70a is equal to the total area of ​​the red light-emitting elements 74r and green light-emitting elements 74g formed in the second transparent display 70b. Note that Fig.10, only display areas of five rows and five columns are extracted and displayed from the display areas formed in both the first transparent display 70a and the second transparent display 70b. However, since more display areas with a plurality of matrices are actually included, the total area of ​​the display areas formed in the first transparent display 70a is equal to the total area of ​​the display areas formed in the second transparent display 70b.

[0088] The transparent double-sided display 70 is formed by bonding such that the upper left vertex V1 of the first transparent display 70a and the upper right vertex V4 of the second transparent display 70b coincide with each other, and the upper right vertex V2 of the first transparent display 70a and the upper left vertex V3 of the second transparent display 70b coincide with each other. At this point, bonding is performed such that the blue light-emitting elements 72b of the first transparent display 70a and the red light-emitting elements 74r or the green light-emitting elements 74g of the second transparent display 70b overlap each other, and the red light-emitting elements 72r or the green light-emitting elements 72g of the first transparent display 70a and the blue light-emitting elements 74b of the second transparent display 70b overlap each other.

[0089] Since the area of ​​the blue light-emitting elements 72b having a low light emission intensity is larger than the area of ​​the red light-emitting elements 72r and the green light-emitting elements 72g in the transparent double-sided display 70 formed in the above manner, the light emission intensities of RGB can be made uniform when displaying color signals having equal RGB values.

[0090] Note that in the present embodiment, the types of light-emitting elements are not limited to RGB. For example, it is possible to similarly apply it to a display device with light-emitting elements of colors other than the three colors, such as RGBY or RGBW. (Operation and effect of the third embodiment)

[0091] As described above, in the transparent double-sided display 70 of the second embodiment, the red light-emitting elements 72r, the green light-emitting elements 72g, and the blue light-emitting elements 74b emit light in a plurality of display colors corresponding to different color signals. In a case where the light emission intensities of the display colors are different, the emission range of the light-emitting elements corresponding to a display color with a low light emission intensity is large. Therefore, even in a case where the light emission intensities of the light-emitting elements corresponding to the respective color signals are different for a plurality of different color signals, the light emission intensities of RGB can be made uniform. Accordingly, the color reproducibility in the transparent double-sided display 70 can be improved.

[0092] Although the embodiments of the present invention have been described above, the above-described embodiments have been presented as examples and are not intended to limit the scope of the present invention. These novel embodiments may be embodied in various other forms. Furthermore, various omissions, substitutions, and changes may be made without departing from the gist of the invention. This embodiment also falls within the scope and spirit of the invention and is encompassed by the invention described in the claims and within a corresponding scope. EXPLANATIONS OF LETTERS OR NUMBERS 10, 30, 40, 50, 60, 70 TRANSPARENT DOUBLE-SIDED DISPLAY (DISPLAY DEVICE) 10a, 30a, 40a, 50a, 60a, 70a FIRST TRANSPARENT DISPLAY 10b, 30b, 40b, 50b, 60b, 70b SECOND TRANSPARENT DISPLAY 12a, 32a, 42a, 52a, 62a DISPLAY AREA (FIRST NON-TRANSMISSION AREA) 12b, 32b, 42b, 52b, 62b TRANSMISSION AREA (FIRST TRANSMISSION AREA) 14a, 34a, 44a, 54a, 64a DISPLAY AREA (SECOND NON-TRANSMISSION AREA) 14b, 34b, 44b, 54b, 64b TRANSMISSION AREA (SECOND TRANSMISSION AREA) 21a, 21b GLASS SUBSTRATE 22a, 22b TRANSPARENT ELECTRODE 23 LIGHT-EMITTING ELEMENT 72r, 74r RED LIGHT-EMITTING ELEMENT 72g, 74g GREEN LIGHT-EMITTING ELEMENT 72b, 74b BLUE LIGHT-EMITTING ELEMENT QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2021-82733 A

[0004]

Claims

[1] A display device in which a first transparent display and a second transparent display are connected to each other, the first transparent display comprises a first transmission region which transmits backlight and a first non-transmission region which has a light-emitting element and which does not transmit the backlight, wherein the light-emitting element performs an externally arranged information display, the second transparent display comprises a second transmission region which transmits backlight and a second non-transmission region which has a light-emitting element and which does not transmit the backlight, wherein the light-emitting element performs an externally arranged information display, wherein an area of ​​at least one second non-transmission area of ​​the second transparent display is smaller than an area of ​​the first non-transmission area that overlaps the at least one second non-transmission area, and the connection is made such that the at least one second non-transmission region is obscured by the first non-transmission region when the display device is viewed with respect to the first transparent display. [2] The display device according to claim 1, wherein the first non-transmission region and the second non-transmission region are each formed in a stripe shape. [3] The display device according to claim 1, wherein the first non-transmission region and the second non-transmission region are each formed in a grid shape. [4] The display device according to claim 1, wherein the first non-transmission region and the second non-transmission region are each formed in a dotted shape. [5] Display device according to one of claims 1 to 4, wherein the first non-transmission region and the second non-transmission region each have a repeating pattern of a plurality of different sizes, and an area of ​​the first transmission region formed between a repeating pattern formed by the first non-transmission region is equal to an area of ​​the second transmission region formed between a repeating pattern formed by the second non-transmission region. [6] The display device according to claim 5, wherein the first non-transmission region and the second non-transmission region are formed in a same repeating pattern. [7] The display device according to any one of claims 1 to 4, wherein the one of the first non-transmission region and the second non-transmission region having a smaller total area is arranged on a side where the ambient illuminance is lower. [8] Display device according to one of claims 1 to 6, wherein the light-emitting element emits light in a variety of display colors corresponding to different color signals, and a light emission area of ​​a light-emitting element corresponding to a display color having a lower light emission intensity is larger in a case where the light emission intensities of the plurality of display colors are different.

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