Display device

Abstract

To provide a display device capable of improving low luminance display performance of the display device and increasing an optical contrast effect.SOLUTION: The present disclosure provides a display device including at least one liquid crystal module, wherein 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 opposing upper and lower surfaces. The lower electrode layer is connected to an upper surface of the lower substrate. The pixel layer is connected to the lower electrode layer, so 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, so 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, so that the upper electrode layer is located between the pixel layer and the upper substrate. A material of the lower electrode layer is a dark low-reflectivity material, and the lower electrode layer absorbs light from outside the upper substrate and prevents an interface between the lower electrode layer and the lower substrate from reflecting the light.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a display device, and more particularly to a display device having good low-brightness display performance and optical contrast effect. [Background technology]

[0002] A cholesteric liquid crystal display (LCD) is a display device that displays images by reflecting external light using cholesteric liquid crystals, and it is necessary to apply electric fields of different intensities and frequencies to change the state of the cholesteric liquid crystals and thereby change the display content of the display. Therefore, a conventional cholesteric LCD includes a substrate, a lower electrode layer, a liquid crystal layer, and an upper electrode layer, which are stacked in this order, so that the lower electrode layer and the upper electrode layer can apply an electric field to the liquid crystal layer and adjust the state of the cholesteric liquid crystal in the liquid crystal layer.

[0003] However, during the display process of a conventional cholesteric liquid crystal display, external light that is not reflected by the liquid crystal layer passes through the liquid crystal layer and then generates unexpected reflected light at the interface between the lower electrode layer and the substrate, which further interferes with the display content of the cholesteric liquid crystal display and causes the cholesteric liquid crystal display to have low brightness display performance and a reduced optical contrast effect.

[0004] In view of this, how to reduce the adverse effect of reflected light on the display effect of cholesteric liquid crystal display devices has become a target of efforts by those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0005] The objective of the present disclosure is to provide a display device in which the electrode layer has a light absorbing effect, so as to reduce the influence of external light on the color presentation of the display device. [Means for solving the problem]

[0006] One embodiment of the present disclosure provides a display device including 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, thereby positioning the lower electrode layer between the pixel layer and the lower substrate. The upper electrode layer is connected to the pixel layer, thereby positioning the pixel layer between the lower electrode layer and the upper electrode layer. The upper substrate is connected to the upper electrode layer, thereby positioning the upper electrode layer between the pixel layer and the upper substrate. The lower electrode layer is made of a dark, low-reflectivity material, and the lower electrode layer absorbs light from outside the upper substrate and prevents light from being reflected at the interface between the lower electrode layer and the lower substrate.

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

[0008] In the display device according to the above 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 reflectance of the lower electrode layer may be 0% to 30%.

[0010] In the display device according to the above embodiment, the at least one liquid crystal module may further include a colored optical adhesive layer connected to the lower surface of the lower substrate, thereby positioning the lower substrate between the lower substrate and the lower electrode layer.

[0011] In the display device according to the above embodiment, at least one 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 made of the same material as the lower electrode layer.

[0014] Another embodiment of the present disclosure provides a display device including a first liquid crystal module, a second liquid crystal module, and a third liquid crystal module. The first liquid crystal module includes 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 opposing upper and lower surfaces. 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, thereby positioning the first lower electrode layer between the first pixel layer and the first lower substrate. The first upper electrode layer is connected to the first pixel layer, thereby positioning the first pixel layer between the first lower electrode layer and the first upper electrode layer. The first upper substrate is connected to the first upper electrode layer, thereby positioning the first upper electrode layer 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, thereby positioning the first lower substrate between the first lower electrode layer and the first colored optical adhesive layer. The second liquid crystal module is connected to the first liquid crystal module, and 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 opposing upper and lower surfaces. 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 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. The third liquid crystal module is connected to the 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 opposing upper and lower surfaces. 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 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 underside 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 material of the first lower electrode layer is a dark, low-reflectivity material, and the first lower electrode layer absorbs light from outside the first upper substrate and prevents 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 embodiment, the low reflectance material may include at least one of dark copper oxide and dark molybdenum oxide.

[0016] In the display device according to the above 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 reflectance 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] As a result, by adjusting the type or properties of the material of the lower electrode layer, the display device of the present disclosure not only allows the lower electrode layer to maintain its conductive properties, but also improves the absorption rate of the liquid crystal module against external light, thereby improving the low-brightness display performance of the display device and increasing the optical contrast effect. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a cross-sectional view schematically illustrating a display device according to a first embodiment of the present disclosure. [Figure 2] 2 is a plan view schematically illustrating a lower electrode layer and a conductive wire layer of the display device of FIG. 1. FIG. [Figure 3] FIG. 10 is a cross-sectional view illustrating a display device according to a second embodiment of the present disclosure. [Figure 4] FIG. 10 is a cross-sectional view illustrating a display device according to a third embodiment of the present disclosure. [Figure 5] FIG. 10 is a cross-sectional view illustrating a display device according to a fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0021] Various embodiments of the present disclosure will be described in more detail below. However, these embodiments are examples of applications of various disclosed concepts and may be specifically implemented within various specific scopes. The specific embodiments are for illustrative purposes only and are not intended to limit the scope of the disclosure. Furthermore, for the sake of clarity, some conventional structures and elements are shown in simplified schematic form in the drawings, and overlapping elements may be represented by the same or similar numbers.

[0022] 1, which is a cross-sectional view of a display device according to a first embodiment of the present invention. 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, low-reflectivity material, which 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. Thus, in addition to maintaining the conductive properties, the lower electrode layer 120 can also improve the absorption rate of external light of the liquid crystal module 100, further improving the low-brightness display performance of the display device and increasing the optical contrast effect.

[0024] Furthermore, the low reflectivity material is dark copper oxide (CuO x ) and dark molybdenum oxide (MoO x ), the resistance of the lower electrode layer 120 may be 0.1 ohm to 0.5 ohm, and the reflectivity of the lower electrode layer 120 may be 0% to 30%. Thus, 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 various usage needs.

[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, and the pixel layer 130 may be a cholesteric liquid crystal layer.

[0026] The upper substrate 150 is connected to the upper electrode layer 140, so that the upper electrode layer 140 is located between the pixel layer 130 and the upper substrate 150. As a result, 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 connected to the lower surface 112 of the lower substrate 110, thereby positioning the lower substrate 110 between the lower substrate 110 and the lower electrode layer 120. Thus, the colored optical adhesive layer 160 can further absorb external light passing through the lower substrate 110, thereby contributing to improving 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, where the lower alignment layer 170 may be provided between the lower electrode layer 120 and the pixel layer 130, and the upper alignment layer 180 may be provided between the pixel layer 130 and the upper electrode layer 140. Thus, by providing 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, and the display effect of the display device can be further improved.

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

[0030] Please refer to Figure 3, which is a cross-sectional view of a display device according to a second embodiment of the present invention. In the display device of Figure 3, there are two liquid crystal modules, and the lower substrate of one of the liquid crystal modules is connected to the upper substrate of the other liquid crystal module, so that the liquid crystal modules can be 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, and the layer structures of the liquid crystal module 200a and the liquid crystal module 200b are the same as or similar to the layer structures of the liquid crystal module 100, and the same configurations will not be described again here. The lower substrate 210a of the liquid crystal module 200a is connected to the upper substrate 250b of the liquid crystal module 200b, thereby completing the stacked structure of the liquid crystal module 200a and the liquid crystal module 200b. It is particularly noteworthy that in the second embodiment, only the material of the lower electrode layer 220b of the liquid crystal module 200b is a dark, low-reflectivity material, while the lower electrode layer 220a of the liquid crystal module 200a remains transparent or partially translucent, thereby avoiding blocking light from the liquid crystal module 200a to the liquid crystal module 200b.

[0032] In addition, 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. 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. This allows the colored optical adhesive layer 260a to absorb external light passing through the lower substrate 210a of the liquid crystal module 200a, thereby reducing the influence of external light on the color representation of the liquid crystal module 200b.

[0033] Please refer to Figure 4, which is a cross-sectional view of a display device according to a third embodiment of the present invention. In the display device of Figure 4, there are three liquid crystal modules, and one lower substrate of the liquid crystal module is connected to the other upper substrate of the liquid crystal module, and the other lower substrate of the liquid crystal module is connected to the other upper substrate of the liquid crystal module, so that the liquid crystal modules can be stacked on top of each other.

[0034] More specifically, in the third embodiment, the display device may include liquid crystal modules 300a, 300b, and 300c, and the layer structures of liquid crystal modules 300a, 300b, and 300c are all the same as or similar to the layer structures of liquid crystal module 100, and therefore, repeated description of similar configurations will be omitted here. Lower substrate 310a of liquid crystal module 300a is connected to upper substrate 350b of liquid crystal module 300b, and lower substrate 310b of liquid crystal module 300b is connected to upper substrate 350c of liquid crystal module 300c, thereby completing the structure in which liquid crystal modules 300a, 300b, and 300c are stacked one on top of the other. It is particularly noteworthy that in the third embodiment, only the material of the lower electrode layer 320c of the liquid crystal module 300c is a dark, low-reflectivity material, while the lower electrode layers 320a and 320b of the liquid crystal modules 300a and 300b can still remain transparent or partially translucent, thereby avoiding blocking light rays from the liquid crystal modules 300a and 300b into the liquid crystal module 300c.

[0035] Furthermore, the first liquid crystal module may further include a colored optical adhesive layer disposed between the lower substrate of the first 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 other liquid crystal module. In the third embodiment, the liquid crystal module 300a includes a colored optical adhesive layer 360a, which is disposed between the lower substrate 310a of the liquid crystal module 300a and the upper substrate 350b of the liquid crystal module 300b. The liquid crystal module 300b includes a colored optical adhesive layer 360b, which is disposed between the lower substrate 310b of the liquid crystal module 300b and the upper substrate 350c of the liquid crystal module 300c. This allows the colored optical adhesive layer 360a to absorb external light in the same way as the colored optical adhesive layer 360b, thereby further improving the color expression of the display device.

[0036] 5 is a cross-sectional view of a display device 400 according to a fourth embodiment of the present invention. 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 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 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 is particularly worth noting that the first lower substrate 411, the first lower electrode layer 412, the first pixel layer 413, the first upper electrode layer 414, and the first upper substrate 415 of the first liquid crystal module 410, the second lower substrate 421, the second lower electrode layer 422, the second pixel layer 423, the second upper electrode layer 424, and the second upper substrate 425 of the second liquid crystal module 420, and the third lower substrate 431, the third lower electrode layer 432, the third pixel layer 433, the third upper electrode layer 434, and the third upper substrate 435 of the third liquid crystal module 430 are arranged in the same or similar manner as the lower substrate 110, the lower electrode layer 120, the pixel layer 130, the upper electrode layer 140, and the upper substrate 150 of the liquid crystal module 100, respectively, and therefore will not be described 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, thereby positioning the first lower substrate 411 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 also connected to the first colored optical adhesive layer 416, thereby positioning the first colored optical adhesive layer 416 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, thereby positioning the second lower substrate 421 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 also connected to the second colored optical adhesive layer 426, thereby positioning the second colored optical adhesive layer 426 between the second lower substrate 421 and the third upper substrate 435. The third colored optical adhesive layer 436 is connected 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 material of the first lower electrode layer 412 is a dark, low-reflectivity material, which 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. Thus, 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, thereby reducing the impact of external light on the color presentation of the display device 400 and improving the optical contrast characteristics.

[0040] As described above, by adjusting the type or properties of the material of the lower electrode layer in the display device disclosed herein, not only can the lower electrode layer maintain its conductive properties, but also improve the absorption rate of the liquid crystal module against external light, thereby improving the low-brightness display performance of the display device and increasing the optical contrast effect.

[0041] Although the present disclosure has been disclosed above by way of examples, the examples do not limit the present disclosure, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure is determined by the scope of the claims. [Explanation of symbols]

[0042] 100, 200a, 200b, 300a, 300b, 300c LCD module 110, 210a, 310a, 310b Lower substrate 111 Top surface 112, 411b, 421b, 431b bottom surface 120, 220a, 220b, 320a, 320b, 320c bottom electrode layer 130 pixel layer 140 Upper electrode layer 150, 250b, 350b, 350c top board 160, 260a, 360a, 360b Colored optical adhesive layer 170 Lower alignment layer 180 Upper alignment layer 190 Conductor layer 400 display device 410 First LCD module 411 First lower board 412 First lower electrode layer 413 First Pixel Layer 414 First upper electrode layer 415 First upper board 416 First colored optical adhesive layer 420 Second LCD module 421 Second Lower Board 422 Second lower electrode layer 423 Second Pixel Layer 424 Second upper electrode layer 425 Second upper board 426 Second colored optical adhesive layer 430 Third LCD module 431 Third lower board 432 Third lower electrode layer 433 Third Pixel Layer 434 Third upper electrode layer 435 Third upper board 436 Third colored optical adhesive layer

Claims

1. at least one liquid crystal module; The at least one liquid crystal module includes: a lower substrate having opposing upper and lower surfaces; 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, with the pixel layer positioned between the upper electrode layer and the lower electrode layer; an upper substrate connected to the upper electrode layer, such that the upper electrode layer is positioned between the upper substrate and the pixel layer; Including, the material of the lower electrode layer is a dark, low-reflectivity material, the lower electrode layer absorbs light from outside the upper substrate, and prevents the interface between the lower electrode layer and the lower substrate from reflecting the light; A display device characterized by:

2. the low reflectivity material includes at least one of dark copper oxide and dark molybdenum oxide; 2. The display device according to claim 1.

3. the resistance value of the lower electrode layer is 0.1 ohm to 0.5 ohm; 2. The display device according to claim 1.

4. The reflectivity of the lower electrode layer is 0% to 30%.

2. The display device according to claim 1.

5. The at least one liquid crystal module includes: a colored optical adhesive layer connected to the lower surface of the lower substrate, thereby positioning the lower substrate between the lower substrate and the lower electrode layer; 2. The display device according to claim 1.

6. The at least one liquid crystal module includes: a lower alignment layer disposed between the lower electrode layer and the pixel layer; an upper alignment layer disposed between the pixel layer and the upper electrode layer; further comprising:

2. The display device according to claim 1.

7. The pixel layer is a cholesteric liquid crystal layer.

2. The display device according to claim 1.

8. further comprising a plurality of conductive wire layers electrically connected to the lower electrode layer and made of the same material as the lower electrode layer; 2. The display device according to claim 1.

9. a first liquid crystal module; a second liquid crystal module connected to the first liquid crystal module; a third liquid crystal module connected to the second liquid crystal module; Including, The first LCD module is a first lower substrate having opposing upper and lower surfaces; a first lower electrode layer connected to the top 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 upper electrode layer and the first lower 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 upper substrate and the first pixel layer; a first colored optical adhesive layer connected to the lower surface of the first lower substrate, such that the first lower substrate is positioned between the first lower electrode layer and the first colored optical adhesive layer; Including, The second liquid crystal module is a second lower substrate having opposing upper and lower surfaces; a second lower electrode layer connected to the upper surface of the second lower substrate; a second pixel layer 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 connected to the second pixel layer, such that the second pixel layer is located between the second upper electrode layer and the second lower electrode layer; a second upper substrate connected to the second upper electrode layer and the first colored optical adhesive layer, respectively, such that the second upper electrode layer is located between the second upper substrate and the second pixel layer, and the first colored optical adhesive layer is located between the second upper substrate and the first lower substrate; a second colored optical adhesive layer connected to the lower surface of the second lower substrate, thereby positioning the second lower substrate between the second lower electrode layer and the second lower substrate; Including, The third LCD module is a third lower substrate having opposing upper and lower surfaces; a third lower electrode layer connected to the top surface of the third lower substrate; a third pixel layer 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 connected to the third pixel layer, such that the third pixel layer is located between the third upper electrode layer and the third lower electrode layer; a third upper substrate connected to the third upper electrode layer and the second colored optical adhesive layer, respectively, such that the third upper electrode layer is located between the third upper substrate and the third pixel layer, and the second colored optical adhesive layer is located between the third upper substrate and the second lower substrate; a third colored optical adhesive layer connected to the lower surface of the third lower substrate, thereby positioning the third lower substrate between the third lower substrate and the third lower electrode layer; Including, the material of the first lower electrode layer is a dark, low-reflectivity material, the first lower electrode layer absorbs light from outside the first upper substrate, and prevents the interface between the first lower electrode layer and the first lower substrate from reflecting the light; A display device characterized by:

10. the low reflectivity material includes at least one of dark copper oxide and dark molybdenum oxide; 10. The display device according to claim 9.

11. the resistance value of the first lower electrode layer is 0.1 ohm to 0.5 ohm; 10. The display device according to claim 9.

12. the reflectivity of the first lower electrode layer is 0% to 30%; 10. The display device according to claim 9.

13. The first pixel layer, the second pixel layer and the third pixel layer are each a cholesteric liquid crystal layer.

10. The display device according to claim 9.

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