Cholesterol liquid crystal display device

Abstract

The utility model discloses a cholesterol liquid crystal display device which comprises a first liquid crystal module, a second liquid crystal module and a third liquid crystal module which are sequentially stacked, a solar cell module is arranged at the bottom of the third liquid crystal module and used for supplying power to electrodes of the liquid crystal modules, and the first liquid crystal module reflects blue light. The second liquid crystal module and the third liquid crystal module reflect the other two colors, and the two sides of the liquid crystal layers of the second liquid crystal module and the third liquid crystal module are both provided with the alignment layers. By optimizing the configuration positions of the alignment layers in the multi-layer liquid crystal module and only arranging the alignment layers in the two lower layers of liquid crystal modules, the reflection effect of the lower liquid crystal layer is effectively improved, the display difference between the display effect of the two lower layers and the display effect of the upper blue liquid crystal layer is made up, the problem that display of a panel is bluish is solved, and the display effect of the panel is improved. Meanwhile, the influence of the alignment layer on the driving voltage of the display device is reduced to the maximum extent, and the power generation efficiency of the solar cell module is improved.

Description

Technical Field

[0001] This utility model relates to the field of cholesterol liquid crystal display technology, and in particular to a cholesterol liquid crystal display device. Background Technology

[0002] Cholesteric liquid crystal displays (Ch-LCDs) have bistable characteristics, namely two stable states: a focal conic state and a planar state. When a voltage is applied, the alignment state of the cholesterol liquid crystal molecules can be controlled to switch between the two stable states of focal conic alignment and planar alignment.

[0003] When cholesteric liquid crystals are arranged in a planar configuration, they reflect light of a specific wavelength. Conversely, when cholesteric liquid crystals are arranged in a focal conical configuration, light passes through them. Therefore, by applying voltage to the cholesteric liquid crystal, it is possible to control whether the cholesteric liquid crystal is allowed to pass through or reflect light of a specific wavelength. This allows users to maintain the displayed content without consuming power. This technology is commonly used in products such as temperature sensor displays, e-books, e-paper, and electronic whiteboards.

[0004] When a cholesteric liquid crystal display panel is used in conjunction with a solar panel on the back, the reflected part can be used to display the image when a light source is provided to the display device, while the part of the light source that passes through the display panel is absorbed by the solar panel, converting the light energy into electrical energy and storing the electrical energy in an energy storage device. This electrical energy can be used to drive and update the display image without the need for external power, making it more suitable for some application scenarios where external power cannot be provided.

[0005] For multi-layered cholesteric liquid crystal display panels, alignment layers are placed on both sides of the liquid crystal layer within each liquid crystal module to adjust the alignment direction of the cholesteric liquid crystal molecules, in order to balance the requirements of light transmittance and wide viewing angle. However, the addition of multiple alignment layers results in a complex film structure, which can reflect or absorb incident light, leading to a significant reduction in the amount of light entering the solar cell module and greatly decreasing the power generation efficiency of the solar cell module. Furthermore, liquid crystal modules with alignment layers not only place high demands on the driver chip, but also have higher power consumption in the cholesteric liquid crystal display device, making it impossible to balance the power generated by the solar cell module with the power consumed by the cholesteric liquid crystal display device. Utility Model Content

[0006] To address the technical problems existing in the background art, this utility model proposes a cholesterol liquid crystal display device.

[0007] The present invention provides a cholesterol liquid crystal display device, comprising: a first liquid crystal module, a second liquid crystal module, a third liquid crystal module, and a solar cell module arranged in sequence;

[0008] The first liquid crystal module includes a first upper substrate and a first lower substrate and a first cholesterol liquid crystal layer sandwiched between the two. The first upper substrate and the first lower substrate are respectively provided with a first electrode. The first cholesterol liquid crystal layer is used to reflect a first color light, and the first color light is blue light.

[0009] The second liquid crystal module includes a second upper substrate, a second lower substrate, and a second cholesterol liquid crystal layer sandwiched between the two. The second upper substrate and the second lower substrate are respectively provided with second electrodes. The second cholesterol liquid crystal layer is used to reflect a second color light that is different from the first color light. An alignment layer is provided on the side of the second upper substrate and / or the second lower substrate near the second cholesterol liquid crystal layer.

[0010] The third liquid crystal module includes a third upper substrate and a third lower substrate and a third cholesterol liquid crystal layer sandwiched between them. The third upper substrate and the third lower substrate are respectively provided with a third electrode. The third cholesterol liquid crystal layer is used to reflect a third color light that is different from the first color light and the second color light. An alignment layer is provided on the side of the third upper substrate and / or the third lower substrate near the third cholesterol liquid crystal layer.

[0011] The solar cell module is disposed on the side of the third liquid crystal module away from the second liquid crystal module. The solar cell module includes a power output terminal, which is electrically connected to the electrodes of at least one liquid crystal module.

[0012] Preferably, the second color light is green light, and the third color light is red light.

[0013] Preferably, the liquid crystal rotation pitch of the first cholesterol liquid crystal layer is 200-370 nm;

[0014] And / or, the liquid crystal rotation pitch of the second cholesterol liquid crystal layer is 260-450 nm;

[0015] And / or, the liquid crystal rotation pitch of the third cholesterol liquid crystal layer is 320-540 nm.

[0016] Preferably, a first upper alignment layer and a first lower alignment layer are respectively provided on the second upper substrate and the second lower substrate, and the second cholesteric liquid crystal layer is sandwiched between the first upper alignment layer and the first lower alignment layer;

[0017] And / or, a second upper alignment layer and a second lower alignment layer are respectively provided on the third upper substrate and the third lower substrate, and a third cholesteric liquid crystal layer is sandwiched between the second upper alignment layer and the second lower alignment layer.

[0018] Preferably, the first upper alignment layer has a first pretilt angle, which causes the liquid crystal molecules of the second cholesterol liquid crystal layer to be arranged in a horizontal or vertical direction, and the first lower alignment layer has a second pretilt angle, which causes the liquid crystal molecules of the second cholesterol liquid crystal layer to be arranged in a horizontal or vertical direction.

[0019] And / or, the second upper alignment layer has a third pretilt angle, such that the liquid crystal molecules of the third cholesterol liquid crystal layer are arranged in a horizontal or vertical direction, and the second lower alignment layer has a fourth pretilt angle, such that the liquid crystal molecules of the third cholesterol liquid crystal layer are arranged in a horizontal or vertical direction.

[0020] Preferably, the solar cell module further includes a base plate and a photovoltaic unit, wherein the photovoltaic unit is disposed on the base plate and located on the side of the third lower substrate away from the third cholesterol liquid crystal layer.

[0021] Preferably, the solar cell module includes multiple photovoltaic units, which are arrayed on a base plate, and each photovoltaic unit is electrically connected to a power output terminal.

[0022] Preferably, the base plate is made of a light-absorbing material or has a light-absorbing layer on it.

[0023] Preferably, the power output terminal is electrically connected to the electrodes on each liquid crystal module substrate.

[0024] This utility model also proposes a cholesterol liquid crystal display device, comprising: a first liquid crystal module, a second liquid crystal module, and a solar cell module arranged in sequence;

[0025] The first liquid crystal module includes a first upper substrate and a first lower substrate and a first cholesterol liquid crystal layer sandwiched between the two. The first upper substrate and the first lower substrate are respectively provided with a first electrode, and the first cholesterol liquid crystal layer is used to reflect a first color light.

[0026] The second liquid crystal module includes a second upper substrate, a second lower substrate, and a second cholesterol liquid crystal layer sandwiched between the two. The second upper substrate and the second lower substrate are respectively provided with second electrodes. The second cholesterol liquid crystal layer is used to reflect a second color light that is different from the first color light. An alignment layer is provided on the side of the second upper substrate and / or the second lower substrate near the second cholesterol liquid crystal layer.

[0027] A solar cell module is disposed on the side of the second liquid crystal module away from the first liquid crystal module. The solar cell module includes a power output terminal, which is electrically connected to the electrodes of at least one liquid crystal module.

[0028] The proposed cholesterol liquid crystal display device includes multiple liquid crystal modules stacked sequentially. External light enters from one side of the top liquid crystal module. A solar cell module is located below the bottom liquid crystal module and supplies power to the electrodes of the liquid crystal module. The top liquid crystal module reflects blue light and has no alignment layers on either side of its internal liquid crystal layer. The bottom liquid crystal module reflects other colors of light and has alignment layers on both sides of its internal liquid crystal layer. By optimizing the alignment layer configuration in the multilayer liquid crystal module, the alignment layer is only set in the bottom liquid crystal module, effectively improving the reflection effect of the bottom liquid crystal layer, compensating for the display difference between the bottom and the upper blue liquid crystal layer, improving the problem of the panel display being too blue, and minimizing the impact of the alignment layer on the driving voltage of the display device, thereby improving the power generation efficiency of the solar cell module. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of one embodiment of a cholesterol liquid crystal display device proposed in this utility model.

[0030] Figure 2 This is a schematic diagram of the electrical connection of one embodiment of a cholesterol liquid crystal display device proposed in this utility model.

[0031] Figure 3 This is a schematic diagram of one embodiment of the second liquid crystal module of a cholesterol liquid crystal display device proposed in this utility model.

[0032] Figure 4 This is a schematic diagram of another embodiment of the second liquid crystal module of the cholesterol liquid crystal display device proposed in this utility model.

[0033] Figure 5 This is a schematic diagram of another embodiment of the second liquid crystal module of the cholesterol liquid crystal display device proposed in this utility model.

[0034] Figure 6 This is a schematic diagram of a solar cell module for one embodiment of a cholesterol liquid crystal display device proposed in this utility model.

[0035] Figure 7 This is a schematic diagram of another embodiment of the cholesterol liquid crystal display device proposed in this utility model. Detailed Implementation

[0036] Reference Figure 1 and 2 The present invention proposes a cholesterol liquid crystal display device, comprising: a first liquid crystal module 100, a second liquid crystal module 200, a third liquid crystal module 300 arranged in sequence, and a solar cell module 400.

[0037] The first liquid crystal module 100 includes a first upper substrate 11 and a first lower substrate 12 and a first cholesterol liquid crystal layer 13 sandwiched between the two. The first upper substrate 11 and the first lower substrate 12 are respectively provided with first electrodes. The first cholesterol liquid crystal layer 13 is used to reflect a first color light, which is blue light.

[0038] The second liquid crystal module 200 includes a second upper substrate 21, a second lower substrate 22, and a second cholesterol liquid crystal layer 23 sandwiched between them. The second upper substrate 21 and the second lower substrate 22 are respectively provided with second electrodes. The second cholesterol liquid crystal layer 23 is used to reflect a second color light that is different from the first color light. The second upper substrate 21 and / or the second lower substrate 22 are provided with an alignment layer on the side close to the second cholesterol liquid crystal layer 23.

[0039] The third liquid crystal module 300 includes a third upper substrate 31 and a third lower substrate 32 and a third cholesterol liquid crystal layer 33 sandwiched between them. The third upper substrate 31 and the third lower substrate 32 are respectively provided with third electrodes. The third cholesterol liquid crystal layer 33 is used to reflect a third color light that is different from the first color light and the second color light. The third upper substrate 31 and / or the third lower substrate 32 are provided with an alignment layer on the side close to the third cholesterol liquid crystal layer 33.

[0040] The solar cell module 400 is disposed on the side of the third liquid crystal module 300 away from the second liquid crystal module 200. The solar cell module 400 includes a power output terminal 43, which is electrically connected to the electrodes of at least one liquid crystal module.

[0041] During the display process, the first cholesteric liquid crystal module 100 is on the top layer, and the solar cell module 400 is on the bottom layer. This embodiment of the cholesteric liquid crystal display utilizes external light for display. External light enters the first, second, and third cholesteric liquid crystal modules 100, 200, and 300 sequentially from above the first cholesteric liquid crystal module 100. The light reflected from the first, second, and third cholesteric liquid crystal modules 100, 200, and 300 then exits from the upper surface of the first cholesteric liquid crystal module 100 and enters the user's eyes.

[0042] In the actual design of a single liquid crystal module, an electrode layer can be first set on each substrate, an alignment layer can be set on the electrode layer, and a cholesteric liquid crystal layer can be sandwiched between the two alignment layers. By applying an appropriate voltage to the cholesteric liquid crystal layer through the two electrodes, the alignment of the cholesteric liquid crystal molecules within the cholesteric liquid crystal layer rotates, thereby controlling the state of the liquid crystal molecules and achieving the switching between incident light reflection and transmission. During liquid crystal module display, a voltage is applied to the cholesteric liquid crystal layer between the two substrates through the electrodes on both sides, causing the alignment of the cholesteric liquid crystal molecules within the cholesteric liquid crystal layer to rotate, thus reflecting the incident light entering the cholesteric liquid crystal layer. The light passing through the three cholesteric liquid crystal modules enters the bottom solar cell module, which converts light energy into electrical energy to power the electrodes of the upper cholesteric liquid crystal modules. Preferably, the power output terminal is electrically connected to the electrodes on the substrate of each liquid crystal module. By reducing the number of alignment layers, the overall driving energy consumption of the display device is reduced, enabling display requirements to be met without external power supply.

[0043] In the specific design, to achieve full-color display, the liquid crystal layers of the three-layer liquid crystal module can reflect red, green, and blue light respectively. Through light mixing control, full-color display based on the three primary colors of red, green, and blue can be achieved. Specifically, the first liquid crystal module displays blue light with a reflected wavelength of 400-500nm; the second liquid crystal module displays green light with a reflected wavelength of 500-600nm; and the third liquid crystal module displays red light with a reflected wavelength of 600-700nm. The reflected wavelength of the liquid crystal layer is closely related to the rotation pitch of the cholesteric liquid crystal. If the rotation pitch of the cholesteric liquid crystal is the same as the wavelength of a certain color of light, then when the cholesteric liquid crystal is energized and rotates, it can reflect light of that color. Accordingly, the rotation pitch of the first cholesteric liquid crystal layer 13 is 200-370nm, the rotation pitch of the second cholesteric liquid crystal layer 23 is 260-450nm, and the rotation pitch of the third cholesteric liquid crystal layer 33 is 320-540nm.

[0044] In this embodiment, the proposed cholesterol liquid crystal display device includes a first liquid crystal module, a second liquid crystal module, and a third liquid crystal module stacked sequentially. External light enters from one side of the first liquid crystal module, and a solar cell module is disposed at the bottom of the third liquid crystal module. The solar cell module is used to supply power to the electrodes of the liquid crystal module. The first liquid crystal module reflects blue light and has no alignment layers on both sides of its internal liquid crystal layer. The second and third liquid crystal modules reflect the other two colors of light and have alignment layers on both sides of their liquid crystal layers. By optimizing the alignment layer configuration position in the multilayer liquid crystal module, the alignment layer is only set in the lower two liquid crystal modules, which effectively improves the reflection effect of the lower liquid crystal layer, compensates for the display difference between the lower two layers and the upper blue liquid crystal layer, improves the problem of the panel display being too blue, and at the same time minimizes the influence of the alignment layer on the driving voltage of the display device, thereby improving the power generation efficiency of the solar cell module.

[0045] Alignment layers are more important for cholesteric liquid crystals than for other types (such as TFT liquid crystals). The rotational pitch of the cholesteric liquid crystal sub-alignment is a key factor in light reflection. Alignment layers are used to anchor the alignment and pitch of cholesteric liquid crystal molecules, ensuring they maintain a stable alignment even when power is off, i.e., forming a "steady state" to maintain stable color light output. Appropriate vertical alignment of cholesteric liquid crystals can provide a wide viewing angle, but reduces reflectivity; conversely, appropriate horizontal alignment can improve light reflectivity. Therefore, alignment layers are used to improve reflectivity or transmittance by anchoring the orientation of liquid crystal molecules.

[0046] In a specific embodiment of the alignment layer, an alignment layer can be disposed on one side of the liquid crystal layer, such as... Figure 3 and 4 As shown. It can also be as follows: Figure 5 As shown, alignment layers are provided on both sides of the liquid crystal layer. In this embodiment, a first upper alignment layer 24 and a first lower alignment layer 25 are respectively provided on the second upper substrate 21 and the second lower substrate 22, and a second cholesteric liquid crystal layer 23 is sandwiched between the first upper alignment layer 24 and the first lower alignment layer 25; a second upper alignment layer 34 and a second lower alignment layer 35 are respectively provided on the third upper substrate 31 and the third lower substrate 32, and a third cholesteric liquid crystal layer 33 is sandwiched between the second upper alignment layer 34 and the second lower alignment layer 35. By providing alignment layers on both sides of the cholesteric liquid crystal layer, the anchoring effect on the liquid crystal molecules is improved. Specifically, a second upper electrode 26 is provided on the second upper substrate 21, and a first upper alignment layer 24 is provided on the second upper electrode 26; a second lower electrode 27 is provided on the second lower substrate 22, and a first lower alignment layer 25 is provided on the second lower electrode 27; the second cholesteric liquid crystal layer 23 is sandwiched between the first upper alignment layer 24 and the first lower alignment layer 25. Similarly, the third liquid crystal module 300 can also be configured similarly.

[0047] Specifically, the first upper alignment layer 24 has a first pretilt angle, causing the liquid crystal molecules of the second cholesteric liquid crystal layer 23 to be aligned horizontally or vertically; the first lower alignment layer 25 has a second pretilt angle, causing the liquid crystal molecules of the second cholesteric liquid crystal layer 23 to be aligned horizontally or vertically; the second upper alignment layer 34 has a third pretilt angle, causing the liquid crystal molecules of the third cholesteric liquid crystal layer 33 to be aligned horizontally or vertically; and the second lower alignment layer 35 has a fourth pretilt angle, causing the liquid crystal molecules of the third cholesteric liquid crystal layer 33 to be aligned horizontally or vertically. For example, for a cholesteric liquid crystal layer, the upper alignment layer is used to apply horizontal alignment to the cholesteric liquid crystal, while the lower alignment layer is used to apply vertical alignment to the cholesteric liquid crystal. This achieves a balance between improved reflectivity and wide viewing angle. In practical designs, the directions of the upper and lower alignment layers can also be interchanged, both achieving the effect of balancing high reflectivity and wide viewing angle.

[0048] Reference Figure 6 In the specific configuration of the solar cell module, the solar cell module 400 also includes a base plate 42 and a photovoltaic unit 41. The photovoltaic unit 41 is disposed on the base plate 42 and located on the side of the third lower substrate 32 away from the third cholesteric liquid crystal layer 33. The photovoltaic unit can be a single unit or composed of multiple sub-units spliced ​​together.

[0049] In one specific embodiment, due to limitations in display device size and photovoltaic unit power supply capability, the solar cell module 400 may include multiple photovoltaic units 41, which are arrayed on a base plate 42. Each photovoltaic unit 41 is electrically connected to a power output terminal, such as... Figure 5 As shown. In actual design, the solar cell module 400 may include a switching element to provide power to the first, second, and third cholesteric liquid crystal modules 100, 200, and 300 in a timely manner according to the screen switching signal for screen switching. For example, this switching element may be a transistor switch. In addition, an energy storage unit may be provided to store the electrical energy generated by the photovoltaic unit for the operation of the first, second, and third cholesteric liquid crystal modules 100, 200, and 300. The energy storage unit may be located inside the solar cell module 400 or externally mounted outside the battery module.

[0050] In other specific embodiments, the base plate 42 is made of a light-absorbing material or has a light-absorbing layer. The base plate of the solar cell module 400 is an opaque and non-reflective light-absorbing base plate, which can absorb light that is not reflected by the cholesteric liquid crystal and not absorbed by the photovoltaic unit, thereby improving the contrast of the screen display.

[0051] like Figure 7As shown, in another specific embodiment of this application, the cholesterol liquid crystal display device includes: a first liquid crystal module 100, a second liquid crystal module 200, and a solar cell module 400 arranged in sequence.

[0052] The first liquid crystal module 100 includes a first upper substrate 11 and a first lower substrate 12 and a first cholesterol liquid crystal layer 13 sandwiched between the two. The first upper substrate 11 and the first lower substrate 12 are respectively provided with first electrodes, and the first cholesterol liquid crystal layer 13 is used to reflect first color light.

[0053] The second liquid crystal module 200 includes a second upper substrate 21, a second lower substrate 22, and a second cholesterol liquid crystal layer 23 sandwiched between them. The second upper substrate 21 and the second lower substrate 22 are respectively provided with second electrodes. The second cholesterol liquid crystal layer 23 is used to reflect a second color light that is different from the first color light. The second upper substrate 21 and / or the second lower substrate 22 are provided with an alignment layer on the side close to the second cholesterol liquid crystal layer 23.

[0054] A solar cell module 400 is disposed on the side of the second liquid crystal module 200 away from the first liquid crystal module 100. The solar cell module 400 includes a power output terminal 43, which is electrically connected to the electrodes of at least one liquid crystal module.

[0055] The display device of this embodiment is used to provide dual-color display. By not providing alignment layers on both sides of the cholesteric liquid crystal layer of the upper liquid crystal module, but only on both sides of the lower cholesteric liquid crystal layer, the influence of the alignment layers on the driving voltage and solar cell power generation efficiency is reduced. Simultaneously, the reflectivity of the lower liquid crystal layer is effectively improved, compensating for the display differences between the upper and lower liquid crystal modules. The specific structures and features of the first and second liquid crystal modules 100 and 200, as well as the design of the solar cell module, are similar to those in the above embodiment and will not be repeated here. In the selection of the reflective color of the first and second liquid crystal modules, cholesteric liquid crystals with a corresponding pitch can be selected according to actual needs, and are not limited to the three primary colors.

[0056] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cholesterol liquid crystal display device, characterized in that, include: The first liquid crystal module (100), the second liquid crystal module (200), the third liquid crystal module (300), and the solar cell module (400) are stacked in sequence. The first liquid crystal module (100) includes a first upper substrate (11) and a first lower substrate (12) and a first cholesterol liquid crystal layer (13) sandwiched between the two. The first upper substrate (11) and the first lower substrate (12) are respectively provided with first electrodes. The first cholesterol liquid crystal layer (13) is used to reflect a first color light, which is blue light. The second liquid crystal module (200) includes a second upper substrate (21), a second lower substrate (22), and a second cholesterol liquid crystal layer (23) sandwiched between the two. The second upper substrate (21) and the second lower substrate (22) are respectively provided with second electrodes. The second cholesterol liquid crystal layer (23) is used to reflect a second color light that is different from the first color light. The second upper substrate (21) and / or the second lower substrate (22) are provided with an alignment layer on the side close to the second cholesterol liquid crystal layer (23). The third liquid crystal module (300) includes a third upper substrate (31) and a third lower substrate (32) and a third cholesterol liquid crystal layer (33) sandwiched between the two. The third upper substrate (31) and the third lower substrate (32) are respectively provided with third electrodes. The third cholesterol liquid crystal layer (33) is used to reflect a third color light that is different from the first color light and the second color light. The third upper substrate (31) and / or the third lower substrate (32) are provided with an alignment layer on the side close to the third cholesterol liquid crystal layer (33). A solar cell module (400) is disposed on the side of the third liquid crystal module (300) away from the second liquid crystal module (200). The solar cell module (400) includes a power output terminal, which is electrically connected to the electrodes of at least one liquid crystal module.

2. The cholesterol liquid crystal display device according to claim 1, characterized in that, The second color light is green light, and the third color light is red light.

3. The cholesterol liquid crystal display device according to claim 2, characterized in that, The liquid crystal rotation pitch of the first cholesterol liquid crystal layer (13) is 200-370 nm; And / or, the liquid crystal rotation pitch of the second cholesterol liquid crystal layer (23) is 260-450 nm; And / or, the liquid crystal rotation pitch of the third cholesterol liquid crystal layer (33) is 320-540 nm.

4. The cholesterol liquid crystal display device according to claim 1, characterized in that, A first upper alignment layer (24) and a first lower alignment layer (25) are respectively provided on the second upper substrate (21) and the second lower substrate (22), and a second cholesterol liquid crystal layer (23) is sandwiched between the first upper alignment layer (24) and the first lower alignment layer (25); And / or, a second upper alignment layer (34) and a second lower alignment layer (35) are respectively provided on the third upper substrate (31) and the third lower substrate (32), and a third cholesterol liquid crystal layer (33) is sandwiched between the second upper alignment layer (34) and the second lower alignment layer (35).

5. The cholesterol liquid crystal display device according to claim 4, characterized in that, The first upper alignment layer (24) has a first pretilt angle, which causes the liquid crystal molecules of the second cholesterol liquid crystal layer (23) to be arranged in a horizontal or vertical direction. The first lower alignment layer (25) has a second pretilt angle, which causes the liquid crystal molecules of the second cholesterol liquid crystal layer (23) to be arranged in a horizontal or vertical direction. And / or, the second upper alignment layer (34) has a third pretilt angle, such that the liquid crystal molecules of the third cholesterol liquid crystal layer (33) are arranged in a horizontal or vertical direction, and the second lower alignment layer (35) has a fourth pretilt angle, such that the liquid crystal molecules of the third cholesterol liquid crystal layer (33) are arranged in a horizontal or vertical direction.

6. The cholesterol liquid crystal display device according to claim 1, characterized in that, The solar cell module (400) also includes a base plate (42) and a photovoltaic unit (41), which is disposed on the base plate (42) and located on the side of the third lower substrate (32) away from the third cholesterol liquid crystal layer (33).

7. The cholesterol liquid crystal display device according to claim 6, characterized in that, The solar cell module (400) includes multiple photovoltaic units (41) arranged in an array on a base plate (42), and each photovoltaic unit (41) is electrically connected to a power output terminal (43).

8. The cholesterol liquid crystal display device according to claim 6, characterized in that, The base plate (42) is made of light-absorbing material or has a light-absorbing layer on it.

9. The cholesterol liquid crystal display device according to claim 1, characterized in that, The power output terminal (43) is electrically connected to the electrodes on each liquid crystal module substrate.

10. A cholesterol liquid crystal display device, characterized in that, include: The first liquid crystal module (100), the second liquid crystal module (200), and the solar cell module (400) are stacked in sequence. The first liquid crystal module (100) includes a first upper substrate (11) and a first lower substrate (12) and a first cholesterol liquid crystal layer (13) sandwiched between the two. The first upper substrate (11) and the first lower substrate (12) are respectively provided with first electrodes, and the first cholesterol liquid crystal layer (13) is used to reflect first color light. The second liquid crystal module (200) includes a second upper substrate (21), a second lower substrate (22), and a second cholesterol liquid crystal layer (23) sandwiched between the two. The second upper substrate (21) and the second lower substrate (22) are respectively provided with second electrodes. The second cholesterol liquid crystal layer (23) is used to reflect a second color light that is different from the first color light. The second upper substrate (21) and / or the second lower substrate (22) are provided with an alignment layer on the side close to the second cholesterol liquid crystal layer (23). A solar cell module (400) is disposed on the side of the second liquid crystal module (200) away from the first liquid crystal module (100). The solar cell module (400) includes a power output terminal, which is electrically connected to the electrodes of at least one liquid crystal module.

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