Display device

Abstract

To provide a display device with which it is possible to secure high transmissivity when transparent double-sided display panels are pasted together.SOLUTION: A transparent double-sided display is composed of a first transparent display and a second transparent display that are pasted together, the first transparent display having a transmission region that passes background light through and a display region that includes a light-emitting element to display information specified from the outside and that does not pass background light through, the second transparent display having a transmission region that passes background light through and a display region that includes a light-emitting element to display information specified from the outside and that does not pass background light through. The area of at least one display region of the second transparent display is smaller than the area of the display region of the first transparent display that overlaps the at least one display region, and the display region of the second transparent display is pasted so as to be hidden behind the display region of the first transparent display, when the transparent double-sided display is seen from the first transparent display side.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a display device. [Background technology]

[0002] Transparent displays that display information on window panes or show windows have been put to practical use. Such transparent displays allow the background to be seen through while displaying information, which alleviates restrictions on where the display device can be installed.

[0003] Recently, a transparent double-sided display has been developed in which two such transparent displays are bonded together, making it possible to display different information on the front and back sides while allowing the background to be seen (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-82733 Summary of the Invention [Problem to be solved by the invention]

[0005] In such a transparent double-sided display, it is desirable to ensure high transmittance.

[0006] An object of the present disclosure is to provide a display device capable of ensuring high transmittance when two transparent double-sided displays are bonded together. [Means for solving the problem]

[0007] The display device according to the present disclosure is a display device in which a first transparent display having a first transmissive region that transmits background light and a first non-transmissive region that does not transmit background light and is provided with a light-emitting element that displays information instructed from outside, and a second transparent display having a second transmissive region that transmits background light and a second non-transmissive region that does not transmit background light and is provided with a light-emitting element that displays information instructed from outside, are bonded together, wherein an area of ​​at least one second non-transmissive region of the second transparent display is smaller than an area of ​​the first non-transmissive region that overlaps with the second non-transmissive region, and the at least one second non-transmissive region is bonded together so that it is hidden by the first non-transmissive region when the display device is viewed from the side of the first transparent display. Effect of the Invention

[0008] According to the movable structure for a display device and the 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]

[0009] [Figure 1A] FIG. 1A is a diagram illustrating the function of the transparent double-sided display according to the first embodiment. [Figure 1B] FIG. 1B is a diagram showing an example of information observed by an observer from each side of a transparent double-sided display. [Figure 2A] FIG. 2A is a diagram showing an example of a case where information is displayed on a transparent display. [Figure 2B] FIG. 2B is a diagram illustrating a problem with a conventional transparent double-sided display. [Diagram 3] FIG. 3 is a diagram showing a schematic structure of the transparent double-sided display according to the first embodiment. [Figure 4A] FIG. 4A is a first diagram illustrating an example of the operation of the transparent double-sided display according to the first embodiment. [Figure 4B] FIG. 4B is a second diagram showing an example of the operation of the transparent double-sided display according to the first embodiment. [Diagram 5]FIG. 5 is a diagram showing an example of a result of simulating a change in transmittance due to misalignment occurring during bonding between the double-sided transparent display according to the first embodiment and a double-sided transparent display of a comparative example. [Figure 6] FIG. 6 is a diagram showing an example in which the display area is formed in a lattice pattern. [Figure 7] FIG. 7 is a diagram showing an example in which the display area is formed in a dot pattern. [Figure 8A] 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. [Figure 8B] FIG. 8B is a first diagram illustrating the relationship between the transmittance and the positional deviation that occurs when the first transparent display and the second transparent display in FIG. 8A are attached to each other. [Figure 9A] FIG. 9A is a second diagram showing a schematic structure of the first transparent display and the second transparent display according to the second embodiment. [Figure 9B] FIG. 9B is a first diagram illustrating the relationship between the transmittance and the positional deviation that occurs when the first transparent display and the second transparent display in FIG. 9A are attached to each other. [Figure 10] FIG. 10 is a diagram showing a schematic structure of a transparent double-sided display according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (First embodiment) Hereinafter, a first embodiment of a display device according to the present disclosure will be described with reference to the drawings.

[0011] (Transparent double-sided display function) The function of the double-sided transparent display 10 will be described with reference to Figures 1A and 1B. Figure 1A is a diagram for explaining the function of the double-sided transparent display according to the first embodiment. Figure 1B is a diagram showing an example of information observed by an observer from each side of the double-sided transparent display.

[0012] 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 configured as display devices having self-luminous display elements. The first transparent display 10a and the second transparent display 10b can display different images. The first transparent display 10a and the second transparent display 10b are bonded together with a transparent adhesive or the like used for bonding optical elements such as lenses.

[0013] FIG. 1A shows an example in which the first transparent display 10a displays an image 8a of "123," and the second transparent display 10b displays an image 8b of "ABC."

[0014] 1B, an observer 5a of the first transparent display 10a can see the image display 8a and the background of the first transparent display 10a, and an observer 5b of the second transparent display 10b can see the image display 8b and the background of the second transparent display 10b.

[0015] 1B, observers 5a and 5b are simultaneously looking at the transparent double-sided display 10, so observer 5a sees observer 5b in the background of image display 8a, and observer 5c sees observer 5a in the background of image display 8b.

[0016] (Issues with conventional transparent double-sided displays) The problems of the conventional double-sided transparent display will be described with reference to Figures 2A and 2B. Figure 2A is a diagram showing an example of information display on a transparent display. Figure 2B is a diagram explaining the problems of the conventional double-sided transparent display.

[0017] The first transparent display 10a constituting the transparent double-sided display 10 has a configuration in which display areas 12a and transmissive areas 12b are alternately arranged in stripes, as shown in FIG. 2A.

[0018] The display area 12a is an area where an image is displayed. In the display area 12a, light-emitting elements that form an image, a drive circuit that controls the ON / OFF of the light-emitting elements, transparent electrodes that apply a voltage to the light-emitting elements, etc. are formed. Details will be described later (see FIG. 3). Note that the display area 12a is a non-transmissive area that does not transmit background light because various circuits and elements for forming an image are mounted thereon. The display area 12a may also have areas where no circuits or elements are mounted. Since these areas transmit background light, the display area 12a may transmit a part of the background light. In this way, the display area 12a is not limited to an area that does not transmit background light at all, but is, for example, an area with a lower transmittance than the transmissive area 12b.

[0019] The transmissive region 12b is a region where no circuit elements related to image display are arranged. Therefore, the transmissive region 12b transmits background light. The viewer can view the background through the transmissive region 12b.

[0020] In the example of FIG. 2A, the viewer can simultaneously view the image display of "A" displayed in the display region 12a and the background seen through the transmissive region 12b.

[0021] The transparent double-sided display 10 is formed by bonding a first transparent display 10a and a second transparent display 10b together. More specifically, the display area 12a and the transmissive area 12b of the first transparent display 10a are bonded together so as to overlap with the display area and the transmissive area of ​​the first transparent display 10a, respectively. The structure of the second transparent display 10b is the same as that of the first transparent display 10a. When bonding the first transparent display 10a and the second transparent display 10b together, there is a risk of misalignment between the first transparent display 10a and the second transparent display 10b.

[0022] 2B shows an example in which misalignment occurs in the width direction of the display area 12a when the first transparent display 10a and the second transparent display 10b are attached to each other. In the case of FIG. 2B, the second transparent display 10b is misaligned to the left side in the drawing. In this case, the area of ​​the transmissive area 12b appears to be reduced when viewed by an observer of the first transparent display 10a. Therefore, the background seen through the transmissive area 12b becomes darker.

[0023] (Structure of transparent double-sided display according to embodiment) The structure of the double-sided transparent display 10 according to the first embodiment will be described with reference to Fig. 3. Fig. 3 is a diagram showing a schematic structure of the double-sided transparent display according to the first embodiment.

[0024] The double-sided transparent display 10 of the present embodiment has a structure in which a first transparent display 10a and a second transparent display 10b are bonded together. The double-sided transparent display 10 is an example of a display device in the present disclosure.

[0025] The first transparent display 10a has a structure in which display regions 12a and transmissive regions 12b are alternately arranged in stripes. The display regions 12a all have the same width 13a, and the transmissive regions 12b all have the same width 13b. The display regions 12a are an example of a first non-transmissive region in the present disclosure. The transmissive regions 12b are an example of a first transmissive region in the present disclosure.

[0026] The second transparent display 10b has a structure in which the display regions 14a and the transmissive regions 14b are alternately arranged in a striped pattern. The display regions 14a all have the same width 15a, and the transmissive regions 14b all have the same width 15b. Here, the width 15a of the display region 14a of the second transparent display 10b is shorter than the width 13a of the display region 12a of the first transparent display 10a. Also, the width 15b of the transmissive region 14b of the second transparent display 10b is longer than the width 13b of the transmissive region 12b of the first transparent display 10a. Therefore, the area of ​​the display region 14a of the second transparent display 10b is smaller than the area of ​​the display region 12a of the first transparent display 10a. The display region 14a is an example of a second non-transmissive region in the present disclosure. The transmissive region 14b is an example of a second transmissive region in the present disclosure.

[0027] The display area 12a of the first transparent display 10a and the display area 14a of the second transparent display 10b are attached to each other so as to overlap each other while facing the transparent double-sided display 10. When the transparent double-sided display 10 is viewed from the side of the first transparent display 10a, the display area 14a of the second transparent display 10b is hidden by the display area 12a of the first transparent display 10a.

[0028] As shown in FIG. 3, the display area 12a of the first transparent display 10a is sandwiched between glass substrates 21a and 21b on the front and back sides, with a transparent electrode 22a, a light-emitting element 23, and a transparent electrode 22b stacked in this order from the front side.

[0029] A voltage is applied to the transparent electrodes 22a and 22b to cause the light emitting element 23 to emit light. The transparent electrodes 22a and 22b respectively constitute an anode and a cathode.

[0030] The light-emitting element 23 forms an image by self-emitting light. The light-emitting element 23 is, for example, an organic EL element. Although not distinguished in Fig. 3, the light-emitting element 23 has a structure in which, for example, red light-emitting elements that emit red light, green light-emitting elements that emit green light, and blue light-emitting elements that emit blue light are regularly arranged.

[0031] Although not shown in FIG. 3, a switching circuit, for example made up of transistors, for driving the light emitting elements 23 is further mounted in the display area 12a of the first transparent display 10a.

[0032] The light-emitting elements 23 used in the display area 12a of the first transparent display 10a and the display area 14a of the second transparent display 10b may be, for example, LEDs other than organic EL elements. A display using LEDs as the light-emitting elements 23 is called a micro LED display. In a micro LED display, red LEDs, green LEDs, and blue LEDs are regularly arranged as the light-emitting elements 23.

[0033] (Operation of the transparent double-sided display of the embodiment) The structure of the double-sided transparent display 10 according to the first embodiment will be described with reference to Figures 4A and 4B. Figure 4A is a first diagram showing an example of the operation of the double-sided transparent display according to the first embodiment. Figure 4B is a second diagram showing an example of the operation of the double-sided transparent display according to the first embodiment.

[0034] 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. At this time, the first transparent display 10a and the second transparent display 10b are attached to each other such that the top left vertex V1 of the first transparent display 10a coincides with the top right vertex V4 of the second transparent display 10b, and the top right vertex V2 of the first transparent display 10a coincides with the top left vertex V3 of the second transparent display 10b.

[0035] As described above, since the display area 14a of the second transparent display 10b is narrower than the display area 12a of the first transparent display 10a, the letter "C" displayed on the second transparent display 10b appears darker than the letter "A" displayed on the first transparent display 10a.

[0036] Figure 4B shows an example of what happens when a positional shift occurs in a direction perpendicular to the display area 12a when the first transparent display 10a and the second transparent display 10b are bonded together in the transparent double-sided display 10 of the first embodiment.

[0037] The left diagram in Fig. 4B shows an example in which there is a large positional deviation, and the right diagram in Fig. 4B shows an example in which there is no positional deviation.

[0038] In the right diagram of Figure 4B, the width of the display area 14a of the second transparent display 10b is smaller than the width of the display area 12a of the first transparent display 10a, so that the transparent area 12b of the first transparent display 10a transmits background light over its entire area, as indicated by the arrow in the same figure.

[0039] In the left diagram of FIG. 4B, the position of the display area 14a of the second transparent display 10b is shifted, and thus the overlapping position of the display area 12a of the first transparent display 10a and the display area 14a of the second transparent display 10b moves. However, since the width of the display area 14a of the second transparent display 10b is smaller than the width of the display area 12a of the first transparent display 10a, the display area 14a of the second transparent display 10b remains hidden by the display area 12a of the first transparent display 10a in a state facing the first transparent display 10a. Therefore, the transparent area 12b of the first transparent display 10a transmits background light over its entire area, as indicated by the arrow in the diagram. Therefore, the transparent double-sided display 10 according to the first embodiment maintains equal transmittance even if a position shift occurs along the width direction of the display area 12a when the first transparent display 10a and the second transparent display 10b are bonded together. In other words, even if misalignment occurs when the first transparent display 10a and the second transparent display 10b are attached to each other, there is no change in the brightness of the background seen through the double-sided transparent display 10. Moreover, the fact that the brightness of the background does not change is true whether the double-sided transparent display 10 is viewed from the side of the first transparent display 10a or the side of the second transparent display 10b.

[0040] (Transmittance of the transparent double-sided display of the embodiment) The relationship between the magnitude of misalignment occurring when the first transparent display 10a and the second transparent display 10b are bonded together and the transmittance of the first transparent display 10a will be described with reference to Fig. 5. Fig. 5 is a diagram showing an example of a result of simulating a change in transmittance due to misalignment occurring when bonding the double-sided transparent display according to the first embodiment and a double-sided transparent display of a comparative example.

[0041] 5 shows the relationship between the magnitude of misalignment in the width direction of the display area 12a between the first transparent display 10a and the second transparent display 10b 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 this embodiment. The width of the display area 12a of the first transparent display 10a is 60 μm, and the width of the transmissive area 12b is 40 μm. The width of the display area 14a of the second transparent display 10b is 40 μm, and the width of the transmissive area 14b is 60 μm.

[0042] 5 shows the relationship between the magnitude of misalignment in the width direction of the display area 12a between the first transparent display 10a and the second transparent display 10b and the transmittance of the first transparent display 10a when the first transparent display 10a and the second transparent display 10b are bonded together as a comparative example. The width of the display area 12a of the first transparent display 10a is 60 μm, and the width of the transmissive area 12b is 40 μm. The width of the display area 14a of the second transparent display 10b is 60 μm, and the width of the transmissive area 14b is 40 μm.

[0043] In this case, when the first transparent display 10a and the second transparent display 10b are attached together without misalignment, both transparent double-sided displays 10 exhibit a transmittance of 40%. When misalignment occurs in the width direction of the display area 12a, in the comparative example, the transmittance decreases in proportion to the magnitude of the misalignment. In this embodiment, the state in which the first transparent display 10a and the second transparent display 10b are attached together without misalignment refers to a state in which the display areas 12a and 14a are attached together with the center line of the display area 12a in the width direction aligned with the center line of the display area 14a in the width direction.

[0044] On the other hand, in the transparent double-sided display 10 of this embodiment, if the misalignment in the width direction of the display region 12a is 10 μm or less, the transmittance is maintained at 40%. If the misalignment in the width direction of the display region 12a exceeds 10 μm, the transmittance decreases in proportion to the magnitude of the misalignment.

[0045] In this way, the transparent double-sided display 10 of this embodiment has a tolerance for preventing a decrease in transmittance with respect to misalignment in the width direction of the display region 12a. In the example shown in FIG. 5, this tolerance is ±10 μm.

[0046] In the transparent double-sided display 10 of the first embodiment, the area of ​​the display region 12a formed on the first transparent display 10a is larger than the area of ​​the display region 14a formed on 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 set the orientation of the transparent double-sided display 10 according to 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 with the first transparent display 10a facing the side facing the outdoors where the illuminance of the display surface is high, and the second transparent display 10b facing the side facing the indoors where the illuminance of the display surface is low.

[0047] (Effects of the first embodiment) As described above, the transparent double-sided display 10 of the first embodiment is a display device in which a first transparent display 10a having a transparent region 12b that transmits background light and a display region 12a that is provided with a light-emitting element that displays information instructed from the outside and does not transmit background light, and a second transparent display 10b having a transparent region 14b that transmits background light and a display region 14a that is provided with a light-emitting element that displays information instructed from the outside and does not transmit background light are bonded together, in which the area of ​​at least one display region 14a of the second transparent display 10b is smaller than the area of ​​the display region 12a that overlaps with the display region 14a, and the display regions 14a are bonded together so that at least one display region 14a is hidden by the display region 12a when the transparent double-sided display 10 is viewed from the side of the first transparent display 10a. Therefore, when the first transparent display 10a and the second transparent display 10b are bonded together, high transmittance can be ensured.

[0048] In the transparent double-sided display 10 of the first embodiment, the display area 12a of the first transparent display 10a and the display area 14a of the second transparent display 10b are each formed in a striped pattern, so that high transmittance can be ensured when the first transparent display 10a and the second transparent display 10b are bonded together.

[0049] In addition, in the transparent double-sided display 10 of the first embodiment, the side including the display area 14a, which has the smaller total area of ​​the display area 12a and the display area 14a, is arranged on the side where the ambient illuminance is low. Therefore, a bright display image is displayed on the first transparent display 10a, which has a bright display image, and a dark display image is displayed on the second transparent display 10b, which has a dark display image, so that a viewer who views each display image can see a display image with a brightness according to the environment and high visibility.

[0050] (Modification of the first embodiment) In the first embodiment, an example in which the display area 12a and the transmissive area 12b are formed in a stripe shape is shown, but the shape of the display area 12a and the transmissive area 12b is not limited to the stripe shape. Hereinafter, examples in which the display area 12a and the transmissive area 12b are formed in a different shape will be described with reference to Figs. 6 and 7. Fig. 6 is a diagram showing an example in which the display area is formed in a lattice shape. Fig. 7 is a diagram showing an example in which the display area is formed in a dot shape.

[0051] 6 shows an example in which "A" is displayed on the first transparent display 30a and "C" is displayed on the second transparent display 30b in the transparent double-sided display 30 according to the modified example of the first embodiment. At this time, the first transparent display 30a and the second transparent display 30b are attached to each other such that the top left vertex V1 of the first transparent display 30a coincides with the top right vertex V4 of the second transparent display 30b, and the top right vertex V2 of the first transparent display 30a coincides with the top left vertex V3 of the second transparent display 30b.

[0052] A display area 32a in a vertical and horizontal grid pattern is formed on the first transparent display 30a. The display area 32a is composed of a display area of ​​width 33a along the vertical direction of the first transparent display 30a and a display area of ​​width 33c along the horizontal direction of the first transparent display 30a. In addition, a transparent area 32b having a horizontal width 33b and a vertical width 33d is formed in the gaps of the grid-shaped display area 32a. The display area 32a is an example of a first non-transparent area in the present disclosure. The transparent area 32b is an example of a first transparent area in the present disclosure.

[0053] Further, the second transparent display 30b is formed with a display area 34a in a vertical and horizontal grid pattern. The display area 34a is composed of a display area of ​​width 35a along the vertical direction of the second transparent display 30b and a display area of ​​width 35c along the horizontal direction of the second transparent display 30b. In addition, a transparent area 34b having a horizontal width 35b and a vertical width 35d is formed in a gap portion of the grid-shaped display area 34a. The display area 34a is an example of a second non-transparent area in the present disclosure. The transparent area 34b is an example of a second transparent area in the present disclosure.

[0054] 6, a width 35a of the display area 34a of the second transparent display 30b is smaller than a width 33a of the display area 32a of the first transparent display 30a. Also, a width 35c of the display area 34a of the second transparent display 30b is smaller than a width 33c of the display area 32a of the first transparent display 30a. Therefore, the area of ​​the display area 34a of the second transparent display 30b is smaller than the area of ​​the display area 32a of the first transparent display 30a.

[0055] When the first transparent display 30a and the second transparent display 30b are bonded together, when viewed from the side of the first transparent display 30a, the lattice-shaped display area 34a of the second transparent display 30b is hidden by the lattice-shaped display area 32a of the first transparent display 30a.

[0056] Therefore, even if misalignment occurs along the width direction of the vertical and horizontal grid-like stripes 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. 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 seen through the transparent double-sided display 30 does not change. Moreover, the fact that the brightness of the background does not change is true whether the transparent double-sided display 30 is viewed from the side of the first transparent display 30a or the side of the second transparent display 30b.

[0057] 7 shows an example in which "A" is displayed on the first transparent display 40a and "C" is displayed on the second transparent display 40b in the transparent double-sided display 40 according to the modified example of the first embodiment. At this time, the first transparent display 40a and the second transparent display 40b are attached to each other such that the top left vertex V1 of the first transparent display 40a coincides with the top right vertex V4 of the second transparent display 40b, and the top right vertex V2 of the first transparent display 40a coincides with the top left vertex V3 of the second transparent display 40b.

[0058] A rectangular dot-shaped display area 42a is formed on the first transparent display 40a. The display area 42a is composed of a plurality of rectangular areas each having a width 43a and a height 43c. A transparent area 42b having a left-right width 43b and a top-bottom width 43d is formed in the gaps of the display area 42a. The display area 42a is an example of a first non-transparent area in the present disclosure. The transparent area 42b is an example of a first transparent area in the present disclosure.

[0059] In addition, a rectangular dot-shaped display area 44a is formed on the second transparent display 40b. The display area 44a is composed of a plurality of rectangular areas each having a width 45a and a height 45c. A transparent area 44b having a left-right width 45b and a top-bottom width 45d is formed in a gap between the display area 44a. The display area 44a is an example of a second non-transparent area in the present disclosure. The transparent area 44b is an example of a second transparent area in the present disclosure.

[0060] 7, the width 45a of each dot constituting the 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. Also, the height 45c of the display area 44a of the second transparent display 40b is smaller than the height 43c of the display area 42a of the first transparent display 40a. Therefore, the area of ​​each dot constituting the display area 44a of the second transparent display 40b is smaller than the area of ​​each dot constituting the display area 42a of the first transparent display 40a.

[0061] Then, when the first transparent display 40a and the second transparent display 40b are bonded together, when viewed from the side of the first transparent display 40a, all of the dots that make up the display area 44a of the second transparent display 40b are hidden by the dots that make up the display area 42a of the first transparent display 40a.

[0062] Therefore, even if misalignment occurs in the vertical or horizontal direction of the dots constituting the display area 44a 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. 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 seen through the transparent double-sided display 40 does not change. Moreover, the fact that the brightness of the background does not change is true whether the transparent double-sided display 40 is viewed from the side of the first transparent display 40a or the side of the second transparent display 40b.

[0063] The patterns constituting the display area of ​​the first transparent display and the display area of ​​the second transparent display are not limited to the examples shown here. That is, patterns other than a grid pattern or a dot pattern may be used as long as the area of ​​the display area of ​​the second transparent display is smaller than the area of ​​the display area of ​​the first transparent display and the display area formed on the second transparent display is hidden when viewed from the first transparent display side when the first transparent display and the second transparent display are attached to each other.

[0064] (Functions and Effects of the Modification of the First Embodiment) As described above, in the transparent double-sided display 30 according to the modified example of the first embodiment, the display area 32a and the display area 34a are each formed in a lattice shape. Therefore, when the first transparent display 30a and the second transparent display 30b are bonded together, high transmittance can be ensured.

[0065] In the transparent double-sided display 40 according to the modification of the first embodiment, the display area 42a and the display area 44a are each formed in a dot shape. Therefore, when the first transparent display 40a and the second transparent display 40b are bonded together, high transmittance can be ensured.

[0066] Second Embodiment Hereinafter, a second embodiment of the display device according to the present disclosure will be described with reference to the drawings.

[0067] (Structure of transparent double-sided display according to embodiment) The structure of the transparent double-sided display 50, 60 of the second embodiment will be described with reference to Figs. 8A and 8B, and Figs. 9A and 9B. Fig. 8A is a first diagram showing a schematic structure of the first transparent display and the second transparent display according to the second embodiment. Fig. 8B is a first diagram explaining the relationship between the misalignment and the transmittance that occurs when the first transparent display and the second transparent display of Fig. 8A are bonded together. Fig. 9A is a second diagram showing a schematic structure of the first transparent display and the second transparent display according to the second embodiment. Fig. 9B is a first diagram explaining the relationship between the misalignment and the transmittance that occurs when the first transparent display and the second transparent display of Fig. 9A are bonded together.

[0068] FIG. 8A shows an example of a pattern of display areas and transmissive areas formed on a first transparent display 50a and a second transparent display 50b constituting a transparent double-sided display 50 according to the second embodiment.

[0069] The first transparent display 50a and the second transparent display 50b are formed with display areas in the form of stripes having the same repeating pattern. The display area 52a formed on the first transparent display 50a is composed of a display area with a width 53a and a display area with a width 53b smaller than the width 53a. In addition, the first transparent display 50a is formed with a transmissive area 52b with a width 53c adjacent to the stripes constituting the display area 52a.

[0070] The display area 54a formed in the second transparent display 50b is composed of a display area of ​​width 53a and a display area of ​​width 53b smaller than the width 53a. In addition, the second transparent display 50b is formed with a transmissive area 54b of width 53c adjacent to the stripes constituting the display area 54a.

[0071] The transparent double-sided display 50 is formed by bonding the first transparent display 50a and the second transparent display 50b together such that the top left vertex V1 of the first transparent display 50a coincides with the top right vertex V4 of the second transparent display 50b, and the top right vertex V2 of the first transparent display 50a coincides with the top left vertex V3 of the second transparent display 50b. At this time, the first transparent display 50a and the second transparent display 50b are bonded together such that the display area of ​​the width 53a of the first transparent display 50a and the display area of ​​the width 53b of the second transparent display 50b overlap.

[0072] By bonding the first transparent display 50a and the second transparent display 50b in this manner, even if misalignment occurs when bonding the first transparent display 50a and the second transparent display 50b, as shown in Fig. 8B, the amount of background light passing through the double-sided transparent display 50 is constant. In other words, even if misalignment occurs when bonding the first transparent display 50a and the second transparent display 50b, the transmittance of the double-sided transparent display 50 is kept constant.

[0073] Next, an example of implementing a similar function using a pattern other than stripes will be described with reference to FIGS. 9A and 9B.

[0074] The first transparent display 60a and the second transparent display 60b constituting the transparent double-sided display 60 shown in Fig. 9A are formed with display areas in the form of dots with exactly the same repeating patterns. The display area 62a formed in the first transparent display 50a is composed of a display area with a width 63a and a height 63c, and a display area with a width 63b smaller than the width 63a and a height 63d smaller than the height 63c. In addition, the first transparent display 60a is formed with a transparent area 62b adjacent to the dots constituting the display area 62a.

[0075] The display area 64a formed on the second transparent display 60b is composed of a display area with a width 63a and a height 63c, and a display area with a width 63b smaller than the width 63a and a height 63d smaller than the height 63c. Also, the second transparent display 60b is formed with a transparent area 64b adjacent to the dots constituting the display area 64a.

[0076] The transparent double-sided display 60 is formed by bonding the first transparent display 60a and the second transparent display 60b together such that the top left vertex V1 of the first transparent display 60a coincides with the top right vertex V4 of the second transparent display 60b, and the top right vertex V2 of the first transparent display 60a coincides with the top left vertex V3 of the second transparent display 60b. At this time, the first transparent display 60a and the second transparent display 60b are bonded together such that the dots of the width 63a of the first transparent display 60a overlap with the dots of the width 63b of the second transparent display 60b, and further the dots of the width 63b of the first transparent display 60a overlap with the dots of the width 63a of the second transparent display 60b.

[0077] By bonding the first transparent display 60a and the second transparent display 60b in this manner, even if misalignment occurs when bonding the first transparent display 60a and the second transparent display 60b, as shown in Fig. 9B, the amount of background light passing through the double-sided transparent display 60 is constant. In other words, even if misalignment occurs when bonding the first transparent display 60a and the second transparent display 60b, the transmittance of the double-sided transparent display 60 is kept constant.

[0078] (Effects of the second embodiment) As described above, in the transparent double-sided display 50 of the second embodiment, the display area 52a of the first transparent display 50a and the display area 54a of the second transparent display 50b each have a repeating pattern of stripes of different sizes, and the area of ​​the transmissive area 52b formed between the repeating patterns formed by the display area 52a is equal to the area of ​​the transmissive area 54b formed between the repeating patterns formed by the display area 54a. Therefore, even if a positional deviation occurs when the first transparent display 50a and the second transparent display 50b are bonded together, the transmittance of the transparent double-sided display 50 can be kept constant. In addition, since the total area of ​​the display area 52a formed on the first transparent display 50a can be equal to the total area of ​​the display area 54a formed on the second transparent display 50b, the brightness of the display image can be equal when the transparent double-sided display 50 is viewed from the side of the first transparent display 50a and the side of the second transparent display 50b.

[0079] In the transparent double-sided display 60 of the second embodiment, the display area 62a of the first transparent display 60a and the display area 64a of the second transparent display 60b each have a repeating pattern of dots of different sizes, and the total area of ​​the transparent areas 62b formed between the repeating patterns formed by the display area 62a is equal to the total area of ​​the transparent areas 64b formed between the repeating patterns formed by the display area 64a. Therefore, even if a positional deviation occurs when the first transparent display 60a and the second transparent display 60b are bonded together, the transmittance of the transparent double-sided display 60 can be kept constant. In addition, since the total area of ​​the display area 62a formed on the first transparent display 60a can be equal to the total area of ​​the display area 64a formed on the second transparent display 60b, the brightness of the display image can be equal when the transparent double-sided display 60 is viewed from the side of the first transparent display 60a and the side of the second transparent display 60b. Note that FIG. 9A shows only 5 rows and 5 columns of the display areas formed on the first transparent display 60a and the second transparent display 60b, respectively. However, in reality, there are many more display areas, each with multiple rows and columns, so the total area of ​​the display area 62a formed on the first transparent display 60a is equal to the total area of ​​the display area 64a formed on the second transparent display 60b.

[0080] In the transparent double-sided display 50 of the second embodiment, the display area 52a of the first transparent display 50a and the display area 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 using the same mask pattern, thereby improving production efficiency.

[0081] Similarly, in the transparent double-sided display 60 of the second embodiment, the display area 62a of the first transparent display 60a and the display area 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 using the same mask pattern, thereby improving production efficiency.

[0082] (Third embodiment) Hereinafter, a third embodiment of the display device according to the present disclosure will be described with reference to the drawings.

[0083] (Structure of transparent double-sided display according to embodiment) The structure of a transparent double-sided display 70 according to the third embodiment will be described with reference to Fig. 10. Fig. 10 is a diagram showing a schematic structure of the transparent double-sided display according to the third embodiment.

[0084] In a typical full-color display, light-emitting regions of the three colors, RGB, are formed and then combined to display full color. Therefore, in order to accurately reproduce the colors to be displayed, it is desirable to make the light emission intensities of the three colors, RGB, uniform. In contrast, this embodiment is a measure taken when it is difficult to make the light emission intensities of the three colors, RGB, uniform.

[0085] The transparent double-sided display 70 of this embodiment has a structure in which a first transparent display 70a and a second transparent display 70b are bonded together.

[0086] In the first transparent display 70a, a rectangular dot-shaped display area is formed, as described in FIG. 9A. Each of these display areas is formed of light-emitting elements that emit one of the three colors, RGB. Here, the light-emitting elements used have a lower emission intensity of blue than the red and green. In this case, in the display area of ​​the first transparent display 70a, the area of ​​the blue light-emitting element 72b is formed to be larger than the areas of the red light-emitting element 72r and the green light-emitting element 72g. Then, a transparent area 72t is formed in the gaps of the display area.

[0087] Similarly, a rectangular dot-shaped display area is formed on the second transparent display 70b. A transmissive area 72t is formed in the gaps of the display area. In the display area of ​​the second transparent display 70b, the area of ​​the blue light-emitting element 74b is larger than the areas of the red light-emitting element 74r and the green light-emitting element 74g. A transmissive area 74t is formed in the gaps of the display area.

[0088] The total area of ​​the blue light-emitting elements 72b formed on the first transparent display 70a is equal to the total area of ​​the blue light-emitting elements 74b formed on the second transparent display 70b. The total areas of the red light-emitting elements 72r and the green light-emitting elements 72g formed on the first transparent display 70a are equal to the total areas of the red light-emitting elements 74r and the green light-emitting elements 74g formed on the second transparent display 70b, respectively. Note that, although FIG. 10 shows only 5 rows and 5 columns of display areas formed on the first transparent display 70a and the second transparent display 70b, in reality, the first transparent display 70a and the second transparent display 70b each have more display areas, that is, a plurality of rows and columns of display areas, so that the total area of ​​the display areas formed on the first transparent display 70a is equal to the total area of ​​the display areas formed on the second transparent display 70b.

[0089] The transparent double-sided display 70 is formed by bonding the first transparent display 70a and the second transparent display 70b together such that the top left vertex V1 of the first transparent display 70a coincides with the top right vertex V4 of the second transparent display 70b, and the top right vertex V2 of the first transparent display 70a coincides with the top left vertex V3 of the second transparent display 70b. At this time, the first transparent display 70a and the second transparent display 70b are bonded together such that the blue light emitting element 72b of the first transparent display 70a overlaps with the red light emitting element 74r or the green light emitting element 74g of the second transparent display 70b, and the red light emitting element 72r or the green light emitting element 72g of the first transparent display 70a overlaps with the blue light emitting element 74b of the second transparent display 70b.

[0090] In the transparent double-sided display 70 thus formed, the area of ​​the blue light-emitting element 72b, which has a low light emission intensity, is larger than the areas of the red light-emitting element 72r and the green light-emitting element 72g, so that when color signals with equal RGB values ​​are displayed, the light emission intensities of RGB can be made equal.

[0091] In this embodiment, the type of light emitting element is not limited to RGB. For example, the present invention can be similarly applied to a display device having light emitting elements of other colors than the three colors, such as RGBY or RGBW.

[0092] (Effects of the third embodiment) As described above, in the transparent double-sided display 70 of the second embodiment, the red light emitting element 72r, the green light emitting element 72g, and the blue light emitting element 74b emit light in a plurality of display colors corresponding to different color signals. When the emission intensities of the display colors are different, the emission area of ​​the light emitting element corresponding to the display color with the lower emission intensity is is larger than the light-emitting area of ​​the light-emitting element corresponding to the display color with high light-emitting intensity. Large It is quickly formed Therefore, even if the light emission intensities of the light emitting elements corresponding to different color signals are different, the light emission intensities of RGB can be made equal. This improves the color reproducibility of the transparent double-sided display 70.

[0093] Although the embodiment of the present invention has been described above, the above-mentioned embodiment is presented as an example and is not intended to limit the scope of the present invention. This new embodiment can be embodied in various other forms. In addition, various omissions, substitutions, and modifications can be made without departing from the gist of the invention. In addition, this embodiment is included in the scope and gist of the invention, and is included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0094] 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-transparent area) 12b, 32b, 42b, 52b, 62b transmission area (first transmission area) 14a, 34a, 44a, 54a, 64a Display area (second non-transparent 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

Claims

1. a first transparent display having a first transmissive region that transmits background light and a first non-transmissive region that does not transmit background light and has a light-emitting element that displays information instructed from the outside; A display device in which a second transparent display having a second transmissive region that transmits background light and a second non-transmissive region that does not transmit background light and has a light-emitting element that displays information instructed from the outside is bonded to the second transparent display, an area of ​​at least one second non-transmissive region of the second transparent display is smaller than an area of ​​the first non-transmissive region overlapping the second non-transmissive region; Furthermore, when the display device is viewed from the first transparent display side, the at least one second non-transmissive area is attached to the first non-transmissive area so as to be hidden by the first non-transmissive area. Display device.

2. The first non-transmitting region and the second non-transmitting region are each formed in a stripe shape. The display device according to claim 1 .

3. The first non-transmitting region and the second non-transmitting region are each formed in a lattice shape. The display device according to claim 1 .

4. The first non-transmitting region and the second non-transmitting region are each formed in a dot shape. The display device according to claim 1 .

5. The first non-transmitting region and the second non-transmitting region each have a repeating pattern of a plurality of different sizes, an area of ​​the first transparent region formed between the repeating patterns formed by the first non-transmissive region is equal to an area of ​​the second transparent region formed between the repeating patterns formed by the second non-transmissive region; The display device according to claim 1 .

6. The first non-transmitting region and the second non-transmitting region are formed in the same repeating pattern. The display device according to claim 5 .

7. The first non-transmitting region and the second non-transmitting region, the one having a smaller total area, are disposed on a side where the ambient illuminance is low. The display device according to claim 1 .

8. The light emitting element emits light in a plurality of display colors corresponding to different color signals, When the light emission intensities of the display colors are different, a light emission area of ​​the light emitting element corresponding to a display color having a low light emission intensity is formed larger than a light emission area of ​​the light emitting element corresponding to a display color having a high light emission intensity. The display device according to claim 1 .

Images