Cholesterol liquid crystal display device

Abstract

The invention provides a cholesterol liquid crystal display device which comprises a first selective light reflection assembly, a second selective light reflection assembly and a third selective light reflection assembly which are sequentially stacked from bottom to top, and incident light enters a cholesterol liquid crystal display from the third selective light reflection assembly. The first selective light reflection assembly, the second selective light reflection assembly and the third selective light reflection assembly are configured to reflect first color light, second color light and third color light with different wavelength ranges. The first thin film photovoltaic module is clamped between the second selective light reflection assembly and the third selective light reflection assembly, and the light transmittance of the third colored light is allowed to be smaller than that of other colored light. The second thin film photovoltaic module is clamped between the first selective light reflection assembly and the second selective light reflection assembly, and the light transmittance of the second colored light is allowed to be smaller than that of other colored light.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal display, and particularly relates to an optical structure of a cholesteric liquid crystal display device. BACKGROUND

[0002] The cholesteric liquid crystal display device can form a planar structure for reflecting external light or a focal conic structure for allowing external light to be transmitted according to an applied electric field. The cholesteric liquid crystal display device can maintain the corresponding structure previously even if the electric field is not maintained. Therefore, the cholesteric liquid crystal display device has a bistable characteristic. Based on the bistable characteristic, the cholesteric liquid crystal display device has been used as an electronic paper display.

[0003] The cholesteric liquid crystal display device can also display colors as long as a proper cholesteric liquid crystal molecule helical pitch and an incident light wavelength are set. In the prior art of the cholesteric liquid crystal display having multiple layers, Patent No. US6597419B1 discloses a reflective type multi-layer liquid crystal display having a blue liquid crystal light control layer, a green liquid crystal light control layer, and a red liquid crystal light control layer stacked in this order from a viewing side. A half-width of a reflection spectrum of any liquid crystal light control layer is greater than a half-width of an adjacent liquid crystal light control layer on the viewing side. In addition, a maximum reflectance of the reflection spectrum of any liquid crystal light control layer is higher than a reflectance of the adjacent liquid crystal light control layer on the viewing side. In one embodiment, a chromaticity coordinate position of a color displayed when all the liquid crystal light control layers are in a reflection state of maximum reflectance exists in a range within a distance of 0.02 from a chromaticity coordinate position of a standard white point in an XYZ colorimetric system.

[0004] Patent No. US20120274887A1 discloses another prior art of a reflective type multi-layer liquid crystal display. The display includes a first liquid crystal panel including a first cholesteric liquid crystal substance crystal material for reflecting first color light, a second liquid crystal panel including a second cholesteric liquid crystal substance crystal material for reflecting second color light, a third liquid crystal panel including a third cholesteric liquid crystal substance crystal material for reflecting third color light, a light absorbing layer combined to a lower portion of the third liquid crystal panel, a first double-sided adhesive buffer layer for combining the second liquid crystal panel to a lower portion of the first liquid crystal panel, and a second double-sided adhesive buffer layer for combining the third liquid crystal panel to a lower portion of the second liquid crystal panel.

[0005] Patent No. US2013222749A1 discloses another prior art of a reflective type multi-layer liquid crystal display. The display includes an upper substrate, a lower substrate, a plurality of isolation structures, and a plurality of photo-reactive liquid crystals. The lower substrate is disposed opposite the upper substrate. The isolation structures are disposed between the upper substrate and the lower substrate to form a plurality of channels between the upper substrate and the lower substrate. Each photo-reactive liquid crystal is disposed in each channel. The upper substrate is configured to block ultraviolet light.

[0006] Patent No. US20210165255A1 discloses another prior art of a reflective multilayer liquid crystal display. The display unit in the display includes an upper transparent substrate, a lower transparent substrate, an upper transparent electrode pattern formed on the upper transparent substrate, a lower transparent electrode pattern formed on the lower transparent substrate, a cholesteric liquid crystal layer sandwiched between the upper transparent electrode pattern and the lower transparent electrode pattern, and a light absorbing layer formed on the upper transparent substrate. The cholesteric liquid crystal layer is used to generate visible light including a wavelength range. The light absorbing layer is used to absorb light outside the wavelength range, allowing visible light within the wavelength range to pass through the light absorbing layer and the upper transparent substrate.

[0007] Patent No. US6518944B1 discloses an integrated, reflective, bistable cholesteric liquid crystal display and a solar cell element to provide power for display electronic devices. The liquid crystal display includes a layer of cholesteric liquid crystal material sandwiched between first and second transparent substrates. The inner surface of the first substrate and the inner surface of the second substrate incorporate the layer of liquid crystal material, and the first substrate is closest to an observer of the display. A first set of conductive electrodes is disposed on the inner surface of the first substrate, and a second set of conductive electrodes is disposed on the inner surface of the second substrate. A display driver circuit is electrically coupled to the first and second sets of conductive electrodes for generating a desired voltage differential between electrodes of the first and second sets of conductive electrodes. The provided solar cell element includes a solar cell or solar panel located behind the second substrate and electrically coupled to a chargeable energy storage device, such as a rechargeable battery. The solar cell receives illumination through the first substrate, the liquid crystal material, and the second substrate, and converts the illumination incident on the solar cell into electrical energy to power the chargeable energy storage device. The cholesteric liquid crystal material allows transmission of incident light regardless of the configuration of the liquid crystal material.

[0008] In the prior art, Patent No. US7733447B2 discloses a liquid crystal display device in which three selectively reflective cholesteric liquid crystal layers are stacked together, including: a first liquid crystal layer disposed on the viewing side of the device, selectively reflecting blue; a second liquid crystal layer arranged next to the first liquid crystal layer, selectively reflecting green; and a third liquid crystal layer arranged next to the second liquid crystal layer, selectively reflecting red. A green-cut filter layer is provided between the green and red liquid crystal layers, selectively absorbing light with a wavelength of 600nm or less. The patent applicant claims that this configuration can reduce unnecessary color and improve display quality.

[0009] The above prior art still does not perfectly solve the specific problems of the cholesteric liquid crystal display industry, and needs to be continuously improved. SUMMARY

[0010] The present invention is to provide a reflective multilayer cholesteric liquid crystal display device with better image quality and the ability to generate electricity. More specifically, in the prior art of the above patent number US7733447B2, even if the solar cell mentioned in patent number US6518944B1 is placed in the bottom layer, two absorption layers of blue and green are arranged. However, the black solar cell placed in the bottom layer cannot receive enough light and cannot effectively generate electricity. The present invention is a new structure that goes beyond the combination of prior art US7733447B2 and US6518944B1, and provides more non-obvious features and functions.

[0011] To achieve the foregoing object, the first preferred embodiment of the present invention is a cholesteric liquid crystal display device, which comprises at least a first selective light reflection component, a first thin-film photovoltaic module, a second selective light reflection component, a second thin-film photovoltaic module, and a third selective light reflection component stacked in order from bottom to top. Incident light enters the cholesteric liquid crystal display device from the third selective light reflection component, wherein the first selective light reflection component, the second selective light reflection component, and the third selective light reflection component are respectively configured to reflect first color light, second color light, and third color light, and the wavelength ranges of the first color light, the second color light, and the third color light are different from each other. For example, the first color light, the second color light, and the third color light can be red light, green light, and blue light, respectively; and the first selective light reflection component, the second selective light reflection component, and the third selective light reflection component can be a red cholesteric liquid crystal module, a green cholesteric liquid crystal module, and a blue cholesteric liquid crystal module, respectively.

[0012] The first thin-film photovoltaic module is sandwiched between the second selective light reflection component and the third selective light reflection component, and the incident light enters the first thin-film photovoltaic module from the lower surface of the third selective light reflection component and the upper surface of the first thin-film photovoltaic module, wherein the first thin-film photovoltaic module allows the transmittance of the third color light to be less than that of other color light. The second thin-film photovoltaic module is sandwiched between the first selective light reflection component and the second selective light reflection component, and the incident light enters the second thin-film photovoltaic module from the lower surface of the second selective light reflection component and the upper surface of the second thin-film photovoltaic module, wherein the second thin-film photovoltaic module allows the transmittance of the second color light to be less than that of other color light. That is, the first thin-film photovoltaic module absorbs the third color light so that the third color light does not enter the underlying second selective light reflection component, and uses the third color light for photoelectric reaction to generate additional power. The second thin-film photovoltaic module absorbs the second color light so that the second color light does not enter the underlying first selective light reflection component, and uses the second color light for photoelectric reaction to generate additional power. In this way, the picture contrast and pixel quality of the cholesteric liquid crystal display device can be improved, and additional power can also be generated.

[0013] Based on the same technical idea, the present application further provides another preferred embodiment, which is a cholesteric liquid crystal display comprising at least a first cholesteric liquid crystal module, a first thin-film photovoltaic module, and a second cholesteric liquid crystal module stacked in sequence from top to bottom. Incident light enters the cholesteric liquid crystal display from the top surface of the first cholesteric liquid crystal module, wherein the first cholesteric liquid crystal module and the second cholesteric liquid crystal module are configured to reflect first color light and second color light, respectively, and the wavelength range of the first color light is different from that of the second color light.

[0014] The first thin-film photovoltaic module is sandwiched between the first cholesteric liquid crystal module and the second cholesteric liquid crystal module, and the incident light enters the first thin-film photovoltaic module from the bottom surface of the first cholesteric liquid crystal module and the top surface of the first thin-film photovoltaic module, wherein the first thin-film photovoltaic module allows the transmittance of the first color light to be less than that of other color light, especially the second color light. That is, the first color light that leaks through the first cholesteric liquid crystal module is absorbed by the first thin-film photovoltaic module and does not enter the underlying second selective light reflection assembly, and the first color light is used by the first thin-film photovoltaic module for photoelectric reaction. In this way, the picture contrast and pixel quality of the cholesteric liquid crystal display can be improved, and additional power can be generated.

[0015] The advantages and spirits of the present application can be further understood by the following detailed description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] The provided drawings serve to provide a further understanding of the embodiments of the present application, and form part of the specification, serve to illustrate the embodiments of the present application, and together with the written description serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and are not used to limit the embodiments of the present application. Other drawings can be derived from these drawings without creative labor for those skilled in the art. The provided drawings include:

[0017] Figure 1 is a schematic cross-sectional view of a cholesteric liquid crystal display according to a first preferred embodiment of the present application.

[0018] Figure 2 is a schematic cross-sectional view of another cholesteric liquid crystal display according to a second preferred embodiment of the present application.

[0019] Figure 3 is a schematic view of another embodiment of the second preferred embodiment of the present application.

[0020] Reference signs: Cholesteric liquid crystal display device 1; first selective light reflection component, red cholesteric liquid crystal module 110; second selective light reflection component, green cholesteric liquid crystal module 120; third selective light reflection component, blue cholesteric liquid crystal module 130; first thin film photovoltaic module 140; second thin film photovoltaic module 150; light absorption module 160; Cholesteric liquid crystal display device 2; first cholesteric liquid crystal module 210; second cholesteric liquid crystal module 220; first thin film photovoltaic module 240; second thin film photovoltaic module 250; light absorption module 260 DETAILED DESCRIPTION

[0021] The specific structure and function details disclosed in the description of the present application are merely representative, and are for the purpose of describing the exemplary embodiments of the present application. The present application can be embodied in many alternative forms, and should not be interpreted as being limited only to the embodiments disclosed herein.

[0022] It should be understood that the terms "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application, and do not indicate or imply that the device or component referred to must have a particular orientation, or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and should not be construed as relative importance or implied number of technical features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, the term "comprising" and any variations thereof mean "at least including".

[0023] It should also be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" in the description of the present application should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0024] Unless the context clearly indicates otherwise, the terms "one", "an", "a" in the description of the present application are also intended to include plural. It should also be understood that the terms "comprising" and / or "including" specify the existence of the stated features, steps, operations, units and / or components, and do not exclude the existence or addition of one or more other features, steps, operations, units, components and / or combinations thereof.

[0025] A first preferred embodiment of the present application, as shown in Figure 1 A cholesteric liquid crystal display 1 is shown. The cholesteric liquid crystal display 1 comprises at least three selective light reflecting components stacked in sequence from bottom to top, which are a first selective light reflecting component 110 configured to reflect a first color light, a second selective light reflecting component 120 configured to reflect a second color light, and a third selective light reflecting component 130 configured to reflect a third color light. Incident light enters the cholesteric liquid crystal display 1 from the top surface of the third selective light reflecting component 130. The first color light, the second color light, and the third color light have different wavelength ranges, and thus the first selective light reflecting component 110, the second selective light reflecting component 120, and the third selective light reflecting component 130 reflect different color lights, respectively. In a preferred embodiment, the first selective light reflecting component 110 can be, but is not limited to, a red cholesteric liquid crystal module, the second selective light reflecting component 120 can be, but is not limited to, a green cholesteric liquid crystal module, and the third selective light reflecting component 130 can be, but is not limited to, a blue cholesteric liquid crystal module. That is, the first color light can be red light, the second color light can be green light, and the third color light can be blue light.

[0026] In this embodiment, incident light enters the cholesteric liquid crystal display 1 from above the blue cholesteric liquid crystal module 130. After entering the blue cholesteric liquid crystal module 130, part of the color light is reflected, and the rest of the color light penetrates the blue cholesteric liquid crystal module 130 and enters the green cholesteric liquid crystal module 120. After entering the green cholesteric liquid crystal module 120, part of the color light is reflected, and the rest of the color light penetrates the green cholesteric liquid crystal module 120 and enters the red cholesteric liquid crystal module 110. After entering the red cholesteric liquid crystal module 110, part of the color light is reflected, and the rest of the color light continues to penetrate the red cholesteric liquid crystal module 110.

[0027] It must be understood that light has left-handed light and right-handed light, and cholesteric liquid crystals have so-called optical rotation. Generally, for a single layer of cholesteric liquid crystal, only light of a single rotation direction can be reflected, either left-handed light or right-handed light. Therefore, when a color light enters a single layer of cholesteric liquid crystal cell that has been driven, only half of the color light can be reflected, and the other half of the color light still penetrates the cholesteric liquid crystal cell.

[0028] For a conventional three-layer cholesteric liquid crystal display, a red cholesteric liquid crystal module, a green cholesteric liquid crystal module and a blue cholesteric liquid crystal module are stacked from bottom to top. The optical rotation has a more serious effect on the picture contrast and pixel quality of the three-layer cholesteric liquid crystal display. When external light enters the blue cholesteric liquid crystal module, only half of the blue light is reflected, and the other half of the blue light together with other color light penetrates the blue cholesteric liquid crystal module and enters the green cholesteric liquid crystal module, which affects the contrast and pixel quality of the green cholesteric liquid crystal module. Similarly, when light enters the green cholesteric liquid crystal module, only half of the green light is reflected, and the other half of the green light together with other color light penetrates the green cholesteric liquid crystal module and enters the red cholesteric liquid crystal module, which affects the picture contrast and pixel quality of the red cholesteric liquid crystal module.

[0029] To solve the above problems, the cholesteric liquid crystal display 1 according to the present application further comprises a first thin-film photovoltaic module 140 and a second thin-film photovoltaic module 150 in a first preferred embodiment. The first thin-film photovoltaic module 140 is arranged between the second selective light reflection component 120 and the third selective light reflection component 130, i.e. between the green cholesteric liquid crystal module 120 and the blue cholesteric liquid crystal module 130. The second thin-film photovoltaic module 150 is arranged between the first selective light reflection component 110 and the second selective light reflection component 120, i.e. between the red cholesteric liquid crystal module 110 and the green cholesteric liquid crystal module 120.

[0030] The incident light enters the first thin-film photovoltaic module 140 through the lower surface of the blue cholesteric liquid crystal module 130 and the upper surface of the first thin-film photovoltaic module 140. The first thin-film photovoltaic module 140 allows the transmittance of the third color light to be less than that of other color light, i.e. the transmittance of blue light is less than that of other color light. The first thin-film photovoltaic module 140 is arranged to absorb the leaked blue light that penetrates the blue cholesteric liquid crystal module 130 and allow other color light to pass through. To achieve this purpose, the first thin-film photovoltaic module 140 is preferably a dye-sensitized solar cell module to capture the leaked blue light that penetrates the blue cholesteric liquid crystal module 130 and perform photoelectric reaction accordingly.

[0031] The dye-sensitized solar cell module must use a specific semiconductor material, when the semiconductor material is irradiated by light, the ground state electron in the dye molecule is excited to the excited state by the photon. In the embodiment, the first thin film photovoltaic module 140 contains a first semiconductor material, when the first thin film photovoltaic module 140 selects an n-type dye-sensitized solar cell module, the first semiconductor material used therein can be titanium dioxide TiO2, niobium pentoxide Nb2O5, zinc oxide ZnO, tin oxide SnO2, or any combination of the foregoing materials. When the first thin film photovoltaic module 140 selects a p-type dye-sensitized solar cell module, the first semiconductor material used therein can be nickel oxide NiO, cuprous oxide Cu2O, or a combination of the foregoing materials.

[0032] For the second thin film photovoltaic module 150, the incident light is incident into the second thin film photovoltaic module 150 through the lower surface of the green cholesteric liquid crystal module 120 and the upper surface of the second thin film photovoltaic module 150, wherein the second thin film photovoltaic module 120 allows the transmittance of the second color light to be less than that of other color lights, that is, the transmittance of green light is less than that of other color lights. The second thin film photovoltaic module 150 is arranged to absorb the leaked green light that penetrates the green cholesteric liquid crystal module 120, and allow other color lights to pass through. In order to achieve this purpose, the second thin film photovoltaic module 150 is also preferably a dye-sensitized solar cell module, which is used to capture the leaked green light that penetrates the green cholesteric liquid crystal module 120 and perform photoelectric reactions accordingly.

[0033] As mentioned above, if the second thin film photovoltaic module 150 is a dye-sensitized solar cell module, it must also contain a second semiconductor material. When the second thin film photovoltaic module 150 selects an n-type dye-sensitized solar cell module, the second semiconductor material used therein can be titanium dioxide TiO2, niobium pentoxide Nb2O5, zinc oxide ZnO, tin oxide SnO2, or any combination of the foregoing materials. When the second thin film photovoltaic module 150 selects a p-type dye-sensitized solar cell module, the first semiconductor material used therein can be nickel oxide NiO, cuprous oxide Cu2O, or a combination of the foregoing materials.

[0034] It should be noted that the first thin film photovoltaic module 140 and the second thin film photovoltaic module 150 can simultaneously select a p-type dye-sensitized solar cell module or simultaneously select an n-type dye-sensitized solar cell module, or one of them can use a p-type dye-sensitized solar cell module and the other can use an n-type dye-sensitized solar cell module, and the present application is not limited.

[0035] The leaked blue light that penetrates the blue light cholesteric liquid crystal module 130 is absorbed by the first thin film photovoltaic module 140 and used for photoelectric reaction to generate additional electric power. At the same time, because the leaked blue light is absorbed, the color light spectrum that enters the green light cholesteric liquid crystal module 120 is relatively pure and clean, and the picture contrast and pixel quality of the green light cholesteric liquid crystal module 120 due to reflection are thus improved. Similarly, the leaked green light that penetrates the green light cholesteric liquid crystal module 120 is absorbed by the second thin film photovoltaic module 150 and used for photoelectric reaction to generate additional electric power. Because the leaked green light is absorbed, the color light spectrum that enters the red light cholesteric liquid crystal module 110 is relatively pure and clean, and the picture contrast and pixel quality of the red light cholesteric liquid crystal module 110 due to reflection are thus higher. Therefore, the overall picture contrast and pixel quality of the cholesteric liquid crystal display 1 are improved.

[0036] The leaked blue light and the leaked green light are absorbed by the first thin film photovoltaic module 140 and the second thin film photovoltaic module 150, and the overall picture contrast and pixel quality of the cholesteric liquid crystal display 1 are thus improved. The leaked blue light and the leaked green light are further used to generate additional electric power, which can be stored for driving the cholesteric liquid crystal display 1 and further output to other external devices.

[0037] In addition, considering the optical rotation, only half of the red light that enters the red light cholesteric liquid crystal module 110 is reflected, and the other half of the red light penetrates the red light cholesteric liquid crystal module 110 and is leaked, which affects the picture contrast and pixel quality of the cholesteric liquid crystal display 1. Please see Figure 1 In the embodiment, the cholesteric liquid crystal display 1 further comprises a light absorption module 160 arranged at the bottom of the red light cholesteric liquid crystal module 110 and used for absorbing any light that penetrates the red light cholesteric liquid crystal module 110. Because the excess stray light behind the red light cholesteric liquid crystal module 110 is absorbed, the picture contrast of the cholesteric liquid crystal display 1 can be improved.

[0038] In an embodiment, the light absorption module 160 can comprise a light absorption layer structure made of light absorption material, such as black foam.

[0039] In another embodiment, the light absorption module 160 can be a solar module that can generate photoelectric reaction, which not only absorbs light but also uses the absorbed light to generate electricity. Such a solar module is preferably a monocrystalline silicon or polycrystalline silicon solar module, because the surface of such a crystalline silicon solar module usually presents a relatively dark color, such as black or dark blue. Of course, the light absorption module 160 can also use a thin film type solar module.

[0040] Based on the same technical idea, the present application proposes a second preferred embodiment, please see Figure 2 is a cholesteric liquid crystal display 2.

[0041] The cholesteric liquid crystal display 2 comprises at least two stacked cholesteric liquid crystal modules, from top to bottom, a first cholesteric liquid crystal module 210 and a second cholesteric liquid crystal module 220. Incident light is incident into the cholesteric liquid crystal display 2 from the top of the first cholesteric liquid crystal module 210, and finally emitted from the bottom of the second cholesteric liquid crystal module 220.

[0042] The first cholesteric liquid crystal module 210 is used to reflect first color light, and the second cholesteric liquid crystal module 220 is used to reflect second color light; wherein the wavelength ranges of the first color light and the second color light are different from each other. For example, when the first color light is blue light, the first cholesteric liquid crystal module 210 is a blue light cholesteric liquid crystal module for reflecting blue light; at this time, the second cholesteric liquid crystal module 220 can be a green light cholesteric liquid crystal module for reflecting green light, or a red light cholesteric liquid crystal module for reflecting red light. When the first color light is green light, the first cholesteric liquid crystal module 210 is a green light cholesteric liquid crystal module for reflecting green light; at this time, the second cholesteric liquid crystal module 220 is a red light cholesteric liquid crystal module for reflecting red light. Generally speaking, because of the wavelength and light transmittance, the red light cholesteric liquid crystal module cannot be used as the first cholesteric liquid crystal module 210. Because the wavelength is longer, the frequency is lower, but the transmittance is better; the wavelength is shorter, the frequency is higher, but the transmittance is worse.

[0043] Compared with red light, green light and blue light, the wavelength of red light is the longest and the transmittance is the best; the wavelength of blue light is the shortest and the transmittance is the worst; the wavelength and transmittance of green light are between them. Therefore, the blue light cholesteric liquid crystal module for reflecting blue light is usually arranged at the uppermost layer of the multi-layer cholesteric liquid crystal display, the red light cholesteric liquid crystal module for reflecting red light is usually arranged at the lowermost layer of the multi-layer cholesteric liquid crystal display, and the green light cholesteric liquid crystal module for reflecting green light is usually arranged between the blue light cholesteric liquid crystal module and the red light cholesteric liquid crystal module.

[0044] The cholesteric liquid crystal display 2 further comprises a first thin-film photovoltaic module 240 arranged between the first cholesteric liquid crystal module 210 and the second cholesteric liquid crystal module 220. Incident light is incident into the first thin-film photovoltaic module 240 from the bottom of the first cholesteric liquid crystal module 210 and the upper surface of the first thin-film photovoltaic module 240.

[0045] It is reminded that the cholesteric liquid crystal is optically active. In general, for a single layer of cholesteric liquid crystal, only one handedness of light can be reflected, either left-handed or right-handed. Therefore, when a color light is incident on a single layer of cholesteric liquid crystal cell that has been driven, only half of the color light can be reflected, and the other half of the color light of different handedness will still penetrate the cholesteric liquid crystal cell. This will affect the contrast ratio and pixel quality of the cholesteric liquid crystal display. The first thin film photovoltaic module 240 in the cholesteric liquid crystal display 2 is used to solve this problem.

[0046] The first thin film photovoltaic module 240 is preferably a dye-sensitized solar cell module, which is used to capture the first color light for photoelectric reaction. Therefore, the first thin film photovoltaic module 240 allows the transmittance of the first color light to be less than that of other color lights. For example, when the first cholesteric liquid crystal module 210 is a blue cholesteric liquid crystal module, the first thin film photovoltaic module 240 allows the transmittance of blue light to be less than that of other color lights. The first thin film photovoltaic module 240 is used to capture and absorb the leakage blue light that penetrates through the blue cholesteric liquid crystal module, and allows other color lights to penetrate through and enter the second cholesteric liquid crystal module 220 for green light reflection or red light reflection. When the first cholesteric liquid crystal module 210 is a green cholesteric liquid crystal module, the first thin film photovoltaic module 240 is used to capture and absorb the leakage green light that penetrates through the green cholesteric liquid crystal module, and allows other color lights to penetrate through and enter the second cholesteric liquid crystal module 220 for red light reflection. In this way, the contrast ratio and picture contrast ratio and pixel quality of the cholesteric liquid crystal display 2 can be improved.

[0047] A specific semiconductor material must be used in the dye-sensitized solar cell module. In the present embodiment, the first thin film photovoltaic module 240 contains a first semiconductor material. When the first thin film photovoltaic module 240 is an n-type dye-sensitized solar cell module, the first semiconductor material used therein can be titanium dioxide TiO2, niobium pentoxide Nb2O5, zinc oxide ZnO, tin oxide SnO2, or a combination of any of the foregoing materials. When the first thin film photovoltaic module 140 is a p-type dye-sensitized solar cell module, the first semiconductor material used therein can be nickel oxide NiO, cuprous oxide Cu2O, or a combination of any of the foregoing materials.

[0048] In order to improve light usage, the cholesteric liquid crystal display 2 can further include a second thin film photovoltaic module 250 arranged below the second cholesteric liquid crystal module 220. The second thin film photovoltaic module 250 is preferably a dye-sensitized solar cell module, which is used to capture the second color light for photoelectric reaction. Therefore, the second thin film photovoltaic module 250 allows the transmittance of the second color light to be less than that of other color lights.

[0049] When the second cholesteric liquid crystal module 220 is a green cholesteric liquid crystal module, the second thin film photovoltaic module 250 allows green light to have a transmittance less than that of other color lights, and the second thin film photovoltaic module 250 is used to capture and absorb the leaked green light that penetrates through the green cholesteric liquid crystal module to perform photoelectric reaction, and allows other color lights to penetrate through. When the second cholesteric liquid crystal module 220 is a red cholesteric liquid crystal module, the second thin film photovoltaic module 250 allows red light to have a transmittance less than that of other color lights, and the second thin film photovoltaic module 250 is used to capture and absorb the leaked red light that penetrates through the red cholesteric liquid crystal module to perform photoelectric reaction, and allows other color lights to penetrate through.

[0050] A specific semiconductor material must be used in the dye-sensitized solar cell module, and in this embodiment, the second thin film photovoltaic module 250 contains a second semiconductor material. When the second thin film photovoltaic module 250 is an n-type dye-sensitized solar cell module, the second semiconductor material used therein can be titanium dioxide TiO2, niobium pentoxide Nb2O5, zinc oxide ZnO, tin oxide SnO2, or a combination of any of the foregoing materials. When the second thin film photovoltaic module 250 is a p-type dye-sensitized solar cell module, the second semiconductor material used therein can be nickel oxide NiO, cuprous oxide Cu2O, or a combination of any of the foregoing materials.

[0051] When the second thin film photovoltaic module 250 captures the second color light to perform photoelectric reaction, the additional power generated can be stored for driving the cholesteric liquid crystal display 2 or provided to other external devices.

[0052] Please see Figure 2 With Figure 3 In one embodiment, the cholesteric liquid crystal display device 2 further includes a light absorption module 260 disposed at the bottom of the cholesteric liquid crystal display device 2 for absorbing any residual light that penetrates through the first cholesteric liquid crystal module 210 and the second cholesteric liquid crystal module 220, so that the picture contrast of the cholesteric liquid crystal display 2 can be improved.

[0053] As Figure 3 shown, for the embodiment of the cholesteric liquid crystal display device 2 without the second thin film photovoltaic module 250, the light absorption module 260 can be disposed below the second cholesteric liquid crystal module 220. For the embodiment of the cholesteric liquid crystal display device 2 with the second thin film photovoltaic module 250, as Figure 2 shown, the light absorption module 260 can be disposed below the second thin film photovoltaic module 250.

[0054] In one embodiment, the light absorption module 260 can include a light absorption layer structure made of a light absorption material, such as black foam.

[0055] In another embodiment, the light absorbing module 260 can be a solar module that can generate a photoelectric reaction. Not only does it absorb light, but it also uses the absorbed light to generate electricity to produce additional power. This additional power can be stored for use to drive the cholesterol liquid crystal display 2 or to provide other external devices.

[0056] By the first thin film photovoltaic module 240, the leaked first color light is absorbed, and the entire picture contrast and pixel quality of the cholesterol liquid crystal display 2 are improved. The leaked first color light is absorbed and further used to generate additional power. These additional powers can be stored for use to drive the cholesterol liquid crystal display 2, and can further be output to other external devices.

[0057] The above detailed description of the preferred embodiments is intended to be illustrative and not limiting of the scope of the application. Other embodiments, which incorporate changes in form, function or improvements, will occur to those skilled in the art. Therefore, the scope of the application should be determined by the broadest interpretation of the appended claims.

Claims

1. A cholesteric liquid crystal display comprising at least a first selective light reflecting component (110), a second selective light reflecting component (120), and a third selective light reflecting component (130) stacked in order from bottom to top, wherein incident light enters the cholesteric liquid crystal display from the third selective light reflecting component (130), and wherein the first selective light reflecting component (110), the second selective light reflecting component (120), and the third selective light reflecting component (130) are configured to reflect first color light, second color light, and third color light, respectively; characterized in that: the first color light, the second color light, and the third color light have mutually different wavelength ranges; the cholesteric liquid crystal display further comprises a first thin film photovoltaic module (140) and a second thin film photovoltaic module (150); the first thin film photovoltaic module (140) is interposed between the second selective light reflecting component (120) and the third selective light reflecting component (130), and wherein the first thin film photovoltaic module (140) allows a transmittance of the third color light to be less than a transmittance of other color light; the second thin film photovoltaic module (150) is interposed between the first selective light reflecting component (110) and the second selective light reflecting component (120), and wherein the second thin film photovoltaic module (150) allows a transmittance of the second color light to be less than a transmittance of other color light.

2. The cholesteric liquid crystal display of claim 1, wherein: the first selective light reflecting component (110), the second selective light reflecting component (120), and the third selective light reflecting component (130) are a red cholesteric liquid crystal module that reflects red light, a green cholesteric liquid crystal module that reflects green light, and a blue cholesteric liquid crystal module that reflects blue light, respectively.

3. The cholesteric liquid crystal display of claim 1, wherein: the first thin film photovoltaic module (140) is a dye-sensitized solar cell module that captures the third color light from the third selective light reflecting component (130).

4. The cholesteric liquid crystal display of claim 3, wherein: the first thin film photovoltaic module (140) is an n-type dye-sensitized solar cell module, wherein the semiconductor material used is selected from the group consisting of titanium dioxide, niobium pentoxide, zinc oxide, tin oxide, and any combination of the foregoing.

5. The cholesteric liquid crystal display of claim 3, wherein: the first thin film photovoltaic module (140) is a p-type dye-sensitized solar cell module, wherein the semiconductor material used is selected from the group consisting of nickel oxide, cuprous oxide, and combinations of the foregoing.

6. The cholesteric liquid crystal display of claim 1, wherein: the second thin film photovoltaic module (150) is a dye-sensitized solar cell module that captures the second color light from the second selective light reflecting component (120).

7. The cholesteric liquid crystal display of claim 6 wherein: the cholesteric liquid crystal layer is a cholesteric liquid crystal layer having a pitch of about 2000 A to about 4000 A. the second thin film photovoltaic module (150) is an n-type dye-sensitized solar cell module, wherein the semiconductor material used is selected from the group consisting of titanium dioxide, niobium pentoxide, zinc oxide, tin oxide, and any combination of the foregoing.

8. The cholesteric liquid crystal display of claim 3, wherein: the second thin film photovoltaic module (150) is a p-type dye-sensitized solar cell module, wherein the semiconductor material used is selected from the group consisting of nickel oxide, cuprous oxide, and combinations of the foregoing.

9. The cholesteric liquid crystal display of claim 1, wherein: Further comprising a light absorption module (160) disposed below the first selective light reflection module (110), wherein the light absorption module (160) absorbs light passing through the first selective light reflection module (110).

10. The cholesteric liquid crystal display of claim 9, wherein: The light absorption module (160) is a solar module.

11. A cholesteric liquid crystal display comprising at least a first cholesteric liquid crystal module (210) and a second cholesteric liquid crystal module (220) stacked in sequence from top to bottom, wherein incident light enters the second cholesteric liquid crystal module (220) from the first cholesteric liquid crystal module (210), and wherein the first cholesteric liquid crystal module (210) and the second cholesteric liquid crystal module (220) are configured to reflect first color light and second color light, respectively; characterized in that: The first color light and the second color light have different wavelength ranges. The cholesteric liquid crystal display further comprises a first thin-film photovoltaic module (240) disposed between the first cholesteric liquid crystal module (210) and the second cholesteric liquid crystal module (220), wherein the first thin-film photovoltaic module (240) allows a transmittance of the first color light to be less than that of other color light.

12. The cholesteric liquid crystal display according to claim 11, wherein: The first thin-film photovoltaic module (240) is a dye-sensitized solar cell module configured to capture the first color light from the first cholesteric liquid crystal module (210).

13. The cholesteric liquid crystal display according to claim 12, wherein: The first thin-film photovoltaic module (240) is an n-type dye-sensitized solar cell module, wherein the semiconductor material used is selected from the group consisting of titanium dioxide, niobium pentoxide, zinc oxide, tin oxide, and any combination thereof.

14. The cholesteric liquid crystal display according to claim 12, wherein: The first thin-film photovoltaic module (240) is a p-type dye-sensitized solar cell module, wherein the semiconductor material used is selected from the group consisting of nickel oxide, cuprous oxide, and a combination thereof.

15. The cholesteric liquid crystal display according to claim 11, wherein: The first color light is one of blue light or green light, and the second color light is one of green light or red light.

16. The cholesteric liquid crystal display of claim 11, wherein: Further comprising a second thin-film photovoltaic module (250) disposed below the second cholesteric liquid crystal module (220), wherein the second thin-film photovoltaic module (250) is a dye-sensitized solar cell module, and wherein the second thin-film photovoltaic module (250) allows a transmittance of the second color light to be less than that of other color light.

17. The cholesteric liquid crystal display of claim 16, wherein: The second thin-film photovoltaic module (250) is an n-type dye-sensitized solar cell module, wherein the semiconductor material used is selected from the group consisting of titanium dioxide, niobium pentoxide, zinc oxide, tin oxide, and any combination thereof.

18. The cholesteric liquid crystal display of claim 16, wherein: The second thin-film photovoltaic module (250) is a p-type dye-sensitized solar cell module, wherein the semiconductor material used is selected from the group consisting of nickel oxide, cuprous oxide, and a combination thereof.

19. The cholesteric liquid crystal display according to claim 11, wherein: Further comprising a light absorption module (260) disposed below the second cholesteric liquid crystal module (220), wherein the light absorption module (260) absorbs light passing through the second cholesteric liquid crystal module (220).

20. The cholesteric liquid crystal display of claim 16, wherein: Further comprising a light absorbing module (260) disposed below the second thin film photovoltaic module (250), the light absorbing module (260) absorbs light passing through the second thin film photovoltaic module (250). Further comprising a light absorbing module (260) disposed below the second thin film photovoltaic module (250), the light absorbing module (260) absorbs light passing through the second thin film photovoltaic module (250).

Images