Display device

Abstract

This disclosure provides a display device comprising at least one liquid crystal module, the liquid crystal module including a lower substrate, a lower electrode layer, a pixel layer, an upper electrode layer, and an upper substrate. The lower substrate has opposing upper and lower surfaces. The lower electrode layer is connected to the upper surface of the lower substrate. The pixel layer is connected to the lower electrode layer, such that the lower electrode layer is located between the pixel layer and the lower substrate. The upper electrode layer is connected to the pixel layer, such that the pixel layer is located between the lower electrode layer and the upper electrode layer. The upper substrate is connected to the upper electrode layer, such that the upper electrode layer is located between the pixel layer and the upper substrate. The lower electrode layer is made of a dark-colored, low-reflectivity material, and absorbs light from outside the upper substrate, preventing the interface between the lower electrode layer and the lower substrate from reflecting the light. Accordingly, the dark-state performance of the display device can be improved and the optical contrast effect can be increased.

Description

[Technical Field]

[0001] This disclosure relates to a display device, and more particularly to a display device with good dark-state performance and optical contrast effect. [Previous Technology]

[0002] A cholesteric liquid crystal display device is a display device that displays images by reflecting external light using cholesteric liquid crystal. The cholesteric liquid crystal display device requires the application of electric fields of different intensities and frequencies to change the state of the cholesteric liquid crystal, thereby changing the display content. Therefore, a conventional cholesteric liquid crystal display device includes a substrate, a lower electrode layer, a liquid crystal layer, and an upper electrode layer stacked sequentially. The lower electrode layer and the upper electrode layer can apply an electric field to the liquid crystal layer to adjust the state of the cholesteric liquid crystal within the liquid crystal layer.

[0003] However, in the display process of conventional cholesteric liquid crystal display devices, external light that is not reflected by the liquid crystal layer will generate unexpected reflected light at the interface between the lower electrode layer and the substrate after passing through the liquid crystal layer, thereby interfering with the display content of the cholesteric liquid crystal display device and resulting in poor dark state performance and optical contrast effect of the cholesteric liquid crystal display device.

[0004] In view of this, how to reduce the negative impact of reflected light on the display effect of cholesterol liquid crystal display devices has become the goal of relevant manufacturers. [Summary of the Invention]

[0005] The purpose of this disclosure is to provide a display device whose electrode layer can have a light absorption effect to reduce the impact of external light on the color performance of the display device.

[0006] One embodiment of this disclosure provides a display device comprising at least one liquid crystal module. The liquid crystal module includes a lower substrate, a lower electrode layer, a pixel layer, an upper electrode layer, and an upper substrate. The lower substrate has an upper surface and a lower surface opposite to each other. The lower electrode layer is connected to the upper surface of the lower substrate. The pixel layer is connected to the lower electrode layer, such that the lower electrode layer is located between the pixel layer and the lower substrate. The upper electrode layer is connected to the pixel layer, such that the pixel layer is located between the lower electrode layer and the upper electrode layer. The upper substrate is connected to the upper electrode layer, such that the upper electrode layer is located between the pixel layer and the upper substrate. The lower electrode layer is made of a dark-colored, low-reflectivity material, and absorbs light from outside the upper substrate and prevents the interface between the lower electrode layer and the lower substrate from reflecting the light.

[0007] In the display device according to the foregoing embodiment, the low reflectivity material may include at least one of a dark copper oxide and a dark molybdenum oxide.

[0008] In the display device according to the foregoing embodiment, the resistance value of the lower electrode layer may be 0.1 ohm to 0.5 ohm.

[0009] In the display device according to the above embodiment, the reflectivity of the lower electrode layer can be 0% to 30%.

[0010] In the display device according to the above embodiment, the liquid crystal module may further include a colored optical adhesive layer that connects to the lower surface of the lower substrate, such that the lower substrate is located between the lower electrode layer and the colored optical adhesive layer.

[0011] In the display device according to the foregoing embodiment, the liquid crystal module may further include a lower alignment layer and an upper alignment layer. The lower alignment layer may be disposed between the lower electrode layer and the pixel layer. The upper alignment layer may be disposed between the pixel layer and the upper electrode layer.

[0012] In the display device according to the above embodiment, the pixel layer may be a cholesteric liquid crystal layer.

[0013] The display device according to the above embodiment may further include a plurality of conductive layers electrically connected to the lower electrode layer, and the material of the conductive layers is the same as that of the lower electrode layer.

[0014] Another embodiment of this disclosure provides a display device comprising a first liquid crystal module, a second liquid crystal module, and a third liquid crystal module. The first liquid crystal module comprises a first lower substrate, a first lower electrode layer, a first pixel layer, a first upper electrode layer, a first upper substrate, and a first colored optical adhesive layer. The first lower substrate has an upper surface and a lower surface opposite to each other. The first lower electrode layer is connected to the upper surface of the first lower substrate. The first pixel layer is connected to the first lower electrode layer, such that the first lower electrode layer is located between the first pixel layer and the first lower substrate. The first upper electrode layer is connected to the first pixel layer, such that the first pixel layer is located between the first lower electrode layer and the first upper electrode layer. The first upper substrate is connected to the first upper electrode layer, such that the first upper electrode layer is located between the first pixel layer and the first upper substrate. The first colored optical adhesive layer is connected to the lower surface of the first lower substrate, such that the first lower substrate is located between the first lower electrode layer and the first colored optical adhesive layer. A second liquid crystal module is connected to a first liquid crystal module, and the second liquid crystal module includes a second lower substrate, a second lower electrode layer, a second pixel layer, a second upper electrode layer, a second upper substrate, and a second colored optical adhesive layer. The second lower substrate has an upper surface and a lower surface opposite to each other. The second lower electrode layer is connected to the upper surface of the second lower substrate. The second pixel layer is connected to the second lower electrode layer, such that the second lower electrode layer is located between the second pixel layer and the second lower substrate. The second upper electrode layer is connected to the second pixel layer, such that the second pixel layer is located between the second lower electrode layer and the second upper electrode layer. The second upper substrate is connected to both the second upper electrode layer and the first colored optical adhesive layer, such that the second upper electrode layer is located between the second pixel layer and the second upper substrate, and the first colored optical adhesive layer is located between the first lower substrate and the second upper substrate. The second colored optical adhesive layer is connected to the lower surface of the second lower substrate, such that the second lower substrate is located between the second lower electrode layer and the second colored optical adhesive layer. A third liquid crystal module is connected to a second liquid crystal module, and the third liquid crystal module includes a third lower substrate, a third lower electrode layer, a third pixel layer, a third upper electrode layer, a third upper substrate, and a third colored optical adhesive layer. The third lower substrate has an upper surface and a lower surface facing each other. The third lower electrode layer is connected to the upper surface of the third lower substrate. The third pixel layer is connected to the third lower electrode layer, such that the third lower electrode layer is located between the third pixel layer and the third lower substrate. The third upper electrode layer is connected to the third pixel layer, such that the third pixel layer is located between the third lower electrode layer and the third upper electrode layer. The third upper substrate is connected to both the third upper electrode layer and the second colored optical adhesive layer, such that the third upper electrode layer is located between the third pixel layer and the third upper substrate, and the second colored optical adhesive layer is located between the second lower substrate and the third upper substrate. The third colored optical adhesive layer is connected to the lower surface of the third lower substrate, such that the third lower substrate is located between the third lower electrode layer and the third colored optical adhesive layer. The first lower electrode layer is made of a dark-colored, low-reflectivity material. The first lower electrode layer absorbs light from outside the first upper substrate and prevents the light from being reflected at the interface between the first lower electrode layer and the first lower substrate.

[0015] In the display device according to the foregoing embodiment, the low reflectivity material may include at least one of a dark copper oxide and a dark molybdenum oxide.

[0016] In the display device according to the foregoing embodiment, the resistance value of the first lower electrode layer may be 0.1 ohm to 0.5 ohm.

[0017] In the display device according to the above embodiment, the reflectivity of the first lower electrode layer may be 0% to 30%.

[0018] In the display device according to the above embodiment, the first pixel layer, the second pixel layer, and the third pixel layer may each be a cholesteric liquid crystal layer.

[0019] Accordingly, the display device disclosed herein adjusts the type or properties of the material of the lower electrode layer so that, in addition to maintaining its conductive properties, the lower electrode layer can also improve the absorption rate of the liquid crystal module for external light, thereby improving the dark state performance of the display device and increasing the optical contrast effect.

Implementation Method

[0021] The various embodiments of this disclosure will be discussed in more detail below. However, this embodiment can be an application of various disclosed concepts and can be implemented in various different specific scopes. The specific embodiments are for illustrative purposes only and are not limited to the scope of the disclosure. In addition, for the sake of simplicity of the drawings, some conventional structures and components will be drawn in a simple schematic manner in the drawings, and repeated components may be represented by the same number or similar numbering.

[0022] Please refer to Figure 1, which is a cross-sectional schematic diagram of the display device according to the first embodiment of the present disclosure. The display device includes at least one liquid crystal module 100, which includes a lower substrate 110, a lower electrode layer 120, a pixel layer 130, an upper electrode layer 140, and an upper substrate 150.

[0023] In detail, the lower substrate 110 has an upper surface 111 and a lower surface 112 opposite to each other, and the lower electrode layer 120 is connected to the upper surface 111 of the lower substrate 110. The lower electrode layer 120 is made of a dark-colored, low-reflectivity material. The lower electrode layer 120 can absorb light from outside the upper substrate 150 and prevent the interface between the lower electrode layer 120 and the lower substrate 110 from reflecting the light. Accordingly, in addition to maintaining conductivity, the lower electrode layer 120 can also improve the absorption rate of external light by the liquid crystal module 100, thereby improving the dark-state performance of the display device and increasing the optical contrast effect.

[0024] Furthermore, the aforementioned low-reflectivity material may include at least one of a dark copper oxide (CuOx) and a dark molybdenum oxide (MoOx), the resistance of the lower electrode layer 120 may be from 0.1 ohm to 0.5 ohm, and the reflectivity of the lower electrode layer 120 may be from 0% to 30%. Accordingly, by adjusting the type or properties of the material of the lower electrode layer 120, the optical contrast characteristics of the display device can be further improved to meet different usage requirements.

[0025] The pixel layer 130 is connected to the lower electrode layer 120, such that the lower electrode layer 120 is located between the pixel layer 130 and the lower substrate 110. The upper electrode layer 140 is connected to the pixel layer 130, such that the pixel layer 130 is located between the lower electrode layer 120 and the upper electrode layer 140. The pixel layer 130 may be a cholesteric liquid crystal layer.

[0026] The upper substrate 150 is connected to the upper electrode layer 140, such that the upper electrode layer 140 is located between the pixel layer 130 and the upper substrate 150. Accordingly, the upper substrate 150 can protect the internal structure of the display device and extend the life of the display device.

[0027] The liquid crystal module 100 may further include a colored optical adhesive layer 160, which connects to the lower surface 112 of the lower substrate 110, such that the lower substrate 110 is located between the lower electrode layer 120 and the colored optical adhesive layer 160. Accordingly, the colored optical adhesive layer 160 can further absorb external light passing through the lower substrate 110, which helps to improve the optical contrast characteristics of the display device.

[0028] The liquid crystal module 100 may further include a lower alignment layer 170 and an upper alignment layer 180. The lower alignment layer 170 may be disposed between the lower electrode layer 120 and the pixel layer 130, and the upper alignment layer 180 may be disposed between the pixel layer 130 and the upper electrode layer 140. Accordingly, by setting the lower alignment layer 170 and the upper alignment layer 180, the alignment direction of the liquid crystal in the pixel layer 130 can be adjusted, further improving the display effect of the display device.

[0029] Please also refer to Figure 2, which is a top view of the lower electrode layer 120 and the conductive layer 190 of the display device in Figure 1. The display device may further include a plurality of conductive layers 190 electrically connected to the lower electrode layer 120, and the material of the conductive layers 190 is the same as that of the lower electrode layer 120. Because the lower electrode layer 120 and the conductive layers 190 are made of the same material, the lower electrode layer 120 and the conductive layers 190 can be completed in a single fan-out step, thereby reducing the process complexity.

[0030] Please refer to Figure 3, which is a cross-sectional schematic diagram of the display device according to the second embodiment of the present disclosure. In the display device of Figure 3, the number of liquid crystal modules can be two, and the lower substrate of one of the liquid crystal modules can be connected to the upper substrate of the other liquid crystal module, so that the liquid crystal modules are stacked on top of each other.

[0031] In detail, in the second embodiment, the display device may include a liquid crystal module 200a and a liquid crystal module 200b. The layer structures in liquid crystal modules 200a and 200b are the same as or similar to the layer structures in the aforementioned liquid crystal module 100, and the similarities will not be repeated here. The lower substrate 210a of the liquid crystal module 200a is connected to the upper substrate 250b of the liquid crystal module 200b to complete the stacked structure of the liquid crystal modules 200a and 200b. It should be noted that in the second embodiment, only the lower electrode layer 220b of the liquid crystal module 200b is made of a dark-colored, low-reflectivity material, while the lower electrode layer 220a of the liquid crystal module 200a can still remain transparent or partially transparent to avoid blocking light from entering the liquid crystal module 200b from the liquid crystal module 200a.

[0032] Furthermore, one of the liquid crystal modules may further include a colored optical adhesive layer disposed between the lower substrate of one of the liquid crystal modules and the upper substrate of the other liquid crystal module. In the second embodiment, the liquid crystal module 200a includes a colored optical adhesive layer 260a, which is disposed between the lower substrate 210a of the liquid crystal module 200a and the upper substrate 250b of the liquid crystal module 200b. Accordingly, the colored optical adhesive layer 260a can absorb external light passing through the lower substrate 210a of the liquid crystal module 200a, reducing the impact of external light on the color performance of the liquid crystal module 200b.

[0033] Please refer to Figure 4, which is a cross-sectional schematic diagram of the display device according to the third embodiment of this disclosure. In the display device of Figure 4, the number of liquid crystal modules can be three. The lower substrate of one of the liquid crystal modules can be connected to the upper substrate of another liquid crystal module, and the lower substrate of the other liquid crystal module can be connected to the upper substrate of yet another liquid crystal module, so that the liquid crystal modules are stacked on top of each other.

[0034] In detail, in the third embodiment, the display device may include liquid crystal module 300a, liquid crystal module 300b, and liquid crystal module 300c. The layer structures of each layer in liquid crystal module 300a, liquid crystal module 300b, and liquid crystal module 300c are the same as or similar to the layer structures in the aforementioned liquid crystal module 100, and the similarities will not be described again here. The lower substrate 310a of liquid crystal module 300a is connected to the upper substrate 350b of liquid crystal module 300b, and the lower substrate 310b of liquid crystal module 300b is connected to the upper substrate 350c of liquid crystal module 300c, so as to complete the structure of liquid crystal module 300a, liquid crystal module 300b, and liquid crystal module 300c stacked together. It should be noted that, in the third embodiment, only the lower electrode layer 320c of the liquid crystal module 300c is made of a dark-colored, low-reflectivity material, while the lower electrode layers 320a and 320b of the liquid crystal modules 300a and 300b can remain transparent or partially transparent, so as to avoid blocking light from entering the liquid crystal module 300c from the liquid crystal modules 300a and 300b.

[0035] Furthermore, one of the liquid crystal modules may further include a colored optical adhesive layer disposed between the lower substrate of the one liquid crystal module and the upper substrate of the other liquid crystal module, and the other liquid crystal module may further include a colored optical adhesive layer disposed between the lower substrate of the other liquid crystal module and the upper substrate of the yet another liquid crystal module. In the third embodiment, liquid crystal module 300a includes a colored optical adhesive layer 360a disposed between the lower substrate 310a of liquid crystal module 300a and the upper substrate 350b of liquid crystal module 300b. Liquid crystal module 300b includes a colored optical adhesive layer 360b disposed between the lower substrate 310b of liquid crystal module 300b and the upper substrate 350c of liquid crystal module 300c. Accordingly, both colored optical adhesive layer 360a and colored optical adhesive layer 360b can absorb external light, thereby improving the color performance of the display device.

[0036] Please refer to Figure 5, which is a cross-sectional schematic diagram of the display device 400 according to the fourth embodiment of this disclosure. The display device 400 includes a first liquid crystal module 410, a second liquid crystal module 420, and a third liquid crystal module 430.

[0037] The first liquid crystal module 410 includes a first lower substrate 411, a first lower electrode layer 412, a first pixel layer 413, a first upper electrode layer 414, a first upper substrate 415, and a first colored optical adhesive layer 416. The second liquid crystal module 420 is connected to the first liquid crystal module 410, and the second liquid crystal module 420 includes a second lower substrate 421, a second lower electrode layer 422, a second pixel layer 423, a second upper electrode layer 424, a second upper substrate 425, and a second colored optical adhesive layer 426. The third liquid crystal module 430 is connected to the second liquid crystal module 420, and the third liquid crystal module 430 includes a third lower substrate 431, a third lower electrode layer 432, a third pixel layer 433, a third upper electrode layer 434, a third upper substrate 435, and a third colored optical adhesive layer 436.

[0038] It should be noted that the first lower substrate 411, first lower electrode layer 412, first pixel layer 413, first upper electrode layer 414, and first upper substrate 415 of the first liquid crystal module 410, the second lower substrate 421, second lower electrode layer 422, second pixel layer 423, second upper electrode layer 424, and second upper substrate 425 of the second liquid crystal module 420, and the third lower substrate 431, third lower electrode layer 432, third pixel layer 433, third upper electrode layer 434, and third upper substrate 435 of the third liquid crystal module 430 are configured in the same or similar manner as the lower substrate 110, lower electrode layer 120, pixel layer 130, upper electrode layer 140, and upper substrate 150 of the aforementioned liquid crystal module 100, and will not be elaborated here.

[0039] The first colored optical adhesive layer 416 of the first liquid crystal module 410 is connected to the lower surface 411b of the first lower substrate 411, so that the first lower substrate 411 is located between the first lower electrode layer 412 and the first colored optical adhesive layer 416. The second upper substrate 425 of the second liquid crystal module 420 is further connected to the first colored optical adhesive layer 416, so that the first colored optical adhesive layer 416 is located between the first lower substrate 411 and the second upper substrate 425. The second colored optical adhesive layer 426 is connected to the lower surface 421b of the second lower substrate 421, so that the second lower substrate 421 is located between the second lower electrode layer 422 and the second colored optical adhesive layer 426. The third upper substrate 435 of the third liquid crystal module 430 is further connected to the second colored optical adhesive layer 426, so that the second colored optical adhesive layer 426 is located between the second lower substrate 421 and the third upper substrate 435. The third colored optical adhesive layer 436 connects to the lower surface 431b of the third lower substrate 431, so that the third lower substrate 431 is located between the third lower electrode layer 432 and the third colored optical adhesive layer 436. Furthermore, the first lower electrode layer 412 is made of a dark-colored, low-reflectivity material. The first lower electrode layer 412 absorbs light from outside the first upper substrate 415 and prevents the interface between the first lower electrode layer 412 and the first lower substrate 411 from reflecting the light. Accordingly, the first lower electrode layer 412, the first colored optical adhesive layer 416, the second colored optical adhesive layer 426, and the third colored optical adhesive layer 436 can absorb external light, reducing the impact of external light on the color performance of the display device 400 and improving optical contrast characteristics.

[0040] In summary, the display device disclosed herein improves the dark state performance of the display device and increases the optical contrast effect by adjusting the type or properties of the material of the lower electrode layer, so that the lower electrode layer can not only retain the conductivity, but also improve the absorption rate of the liquid crystal module for external light.

[0041] Although the present disclosure has been disclosed above with reference to embodiments, it is not intended to limit the present disclosure. Any person skilled in the art may make various modifications and alterations without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the appended claims. [Simplified Explanation of the Diagram]

[0020] Figure 1 is a cross-sectional schematic diagram of the display device according to the first embodiment of the present disclosure; Figure 2 is a top view of the lower electrode layer and the conductor layer of the display device in Figure 1; Figure 3 is a cross-sectional schematic diagram of the display device according to the second embodiment of the present disclosure; Figure 4 is a cross-sectional schematic diagram of the display device according to the third embodiment of the present disclosure; and Figure 5 is a cross-sectional schematic diagram of the display device according to the fourth embodiment of the present disclosure.

Claims

1. A display device comprising: at least one liquid crystal module, comprising: a lower substrate having an upper surface and a lower surface opposite to each other; a lower electrode layer connected to the upper surface of the lower substrate; a pixel layer connected to the lower electrode layer such that the lower electrode layer is located between the pixel layer and the lower substrate; an upper electrode layer connected to the pixel layer such that the pixel layer is located between the lower electrode layer and the upper electrode layer; and an upper substrate connected to the upper electrode layer such that the upper electrode layer is located between the pixel layer and the upper substrate; wherein... The lower electrode layer is made of a dark-colored, low-reflectivity material. The lower electrode layer absorbs light from outside the upper substrate and prevents the light from being reflected at the interface between the lower electrode layer and the lower substrate. The resistance of the lower electrode layer is 0.1 ohm to 0.5 ohm.

2. The display device as claimed in claim 1, wherein the low reflectivity material comprises at least one of a dark copper oxide and a dark molybdenum oxide.

3. The display device as claimed in claim 1, wherein the reflectivity of the lower electrode layer is 0% to 30%.

4. The display device as claimed in claim 1, wherein the at least one liquid crystal module further includes a colored optical adhesive layer connecting the lower surface of the lower substrate, such that the lower substrate is located between the lower electrode layer and the colored optical adhesive layer.

5. The display device as claimed in claim 1, wherein the at least one liquid crystal module further comprises: a lower alignment layer disposed between the lower electrode layer and the pixel layer; and an upper alignment layer disposed between the pixel layer and the upper electrode layer.

6. The display device as claimed in claim 1, wherein the pixel layer is a cholesteric liquid crystal layer.

7. The display device as claimed in claim 1 further includes a plurality of conductive layers electrically connected to the lower electrode layer, and the conductive layers are made of the same material as the lower electrode layer.

8. A display device comprising: a first liquid crystal module, comprising: a first lower substrate having an opposing upper surface and a lower surface; a first lower electrode layer connected to the upper surface of the first lower substrate; a first pixel layer connected to the first lower electrode layer, such that the first lower electrode layer is located between the first pixel layer and the first lower substrate; a first upper electrode layer connected to the first pixel layer, such that the first pixel layer is located between the first lower electrode layer and the first upper electrode layer; a first upper substrate connected to the first upper electrode layer, such that the first upper electrode layer is located between the first pixel layer and the first upper substrate; and a first colored optical adhesive layer connected to the lower surface of the first lower substrate, such that the first lower substrate is located between the first lower electrode layer and the first colored optical adhesive layer; and a second liquid crystal module connected to the first liquid crystal module, wherein the second liquid crystal module comprises: a second lower substrate having an opposing upper surface and a lower surface; and a second lower electrode layer connected to the upper surface of the second lower substrate. A second pixel layer is connected to the second lower electrode layer, such that the second lower electrode layer is located between the second pixel layer and the second lower substrate; a second upper electrode layer is connected to the second pixel layer, such that the second pixel layer is located between the second lower electrode layer and the second upper electrode layer; a second upper substrate is connected to the second upper electrode layer and the first colored optical adhesive layer, such that the second upper electrode layer is located between the second pixel layer and the second upper substrate, and the first colored optical adhesive layer is located between the first lower substrate and the second upper substrate; and a second colored optical adhesive layer is connected to the lower surface of the second lower substrate, such that the second lower substrate is located between the second lower electrode layer and the second colored optical adhesive layer; and a third liquid crystal module is connected to the second liquid crystal module, and the third liquid crystal module includes: a third lower substrate having an opposing upper surface and a lower surface; and a third lower electrode layer connected to the upper surface of the third lower substrate; A third pixel layer is connected to the third lower electrode layer, such that the third lower electrode layer is located between the third pixel layer and the third lower substrate; a third upper electrode layer is connected to the third pixel layer, such that the third pixel layer is located between the third lower electrode layer and the third upper electrode layer; a third upper substrate is connected to the third upper electrode layer and the second colored optical adhesive layer, such that the third upper electrode layer is located between the third pixel layer and the third upper substrate, and the second colored optical adhesive layer is located between the second lower substrate and the third upper substrate; and a third colored optical adhesive layer is connected to the lower surface of the third lower substrate, such that the third lower substrate is located between the third lower electrode layer and the third colored optical adhesive layer; wherein... The first lower electrode layer is made of a dark-colored, low-reflectivity material. The first lower electrode layer absorbs light from outside the first upper substrate and prevents the light from being reflected at the interface between the first lower electrode layer and the first lower substrate. The resistance of the first lower electrode layer is 0.1 ohm to 0.5 ohm.

9. The display device as claimed in claim 8, wherein the low reflectivity material comprises at least one of a dark copper oxide and a dark molybdenum oxide.

10. The display device as claimed in claim 8, wherein the reflectivity of the first lower electrode layer is 0% to 30%.

11. The display device as claimed in claim 8, wherein the first pixel layer, the second pixel layer, and the third pixel layer are each a cholesteric liquid crystal layer.

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