Cholesteric liquid crystal display device

Abstract

To provide a cholesteric liquid crystal display device.SOLUTION: A cholesteric liquid crystal display device comprises a first selective light reflection member 110, a second selective light reflection member 120, and a third selective light reflection member 130, which are sequentially stacked from bottom to top. Incident light enters the inside of the cholesteric liquid crystal display device from the third selective light reflection member 130. The first selective light reflection member, the second selective light reflection member, and the third selective light reflection member are arranged so as to reflect a color component of first light, a color component of second light, and a color component of third light, respectively. A first thin-film photovoltaic module 140 is disposed between the second selective light reflection member 120 and the third selective light reflection member 130, and the transmittance of the color component of the third light is lower than the transmittance of the other lights. A second thin-film photovoltaic module 150 is disposed between the first selective light reflection member 110 and the second selective light reflection member 120, and the transmittance of the color component of the second light is lower than the transmittance of the other lights.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the structure of liquid crystal display technology, and more particularly to the optical structure of cholesteric liquid crystal displays. [Background technology]

[0002] A cholesteric liquid crystal display device can form a planar structure that reflects external light or a focal conic structure that allows external light to pass through, depending on the applied electric field. Even when no electric field is applied, the cholesteric liquid crystal display device can maintain the corresponding conventional structure. Therefore, the cholesteric liquid crystal display device has bi-stable properties, and based on the bi-stable properties, the cholesteric liquid crystal display device is used as an electronic paper display device.

[0003] By appropriately setting the helical pitch of the cholesteric liquid crystal molecules and the wavelength of incident light, cholesteric liquid crystal displays can also display color. Among prior art cholesteric liquid crystal displays using multilayer liquid crystals, U.S. Patent Publication No. US6,597,419B1 discloses a reflective multilayer liquid crystal display device comprising 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 the viewing side. The full width at half maximum of the reflection spectrum of each liquid crystal light control layer is greater than the full width at half maximum of the liquid crystal light control layer adjacent to the viewing side. Furthermore, the maximum reflectance of the reflection spectrum of each liquid crystal light control layer is greater than the reflectance of the liquid crystal light control layer adjacent to the viewing side. In one embodiment, in the XYZ color space, the chromaticity coordinates of the color displayed when all liquid crystal light control layers are in their maximum reflectance reflective states are within a distance of 0.02 from the chromaticity coordinates of the standard white point.

[0004] U.S. Patent Publication No. US20120274887A1 discloses another prior art reflective multi-layer liquid crystal display device. The display device includes a first liquid crystal panel, a second liquid crystal panel, a third liquid crystal panel, a light-absorbing layer, a first double-sided adhesive buffer layer, and a second double-sided adhesive buffer layer. The first liquid crystal panel includes a first cholesteric liquid crystal material crystal material for reflecting light of a first color. The second liquid crystal panel includes a second cholesteric liquid crystal material crystal material for reflecting light of a second color. The third liquid crystal panel includes a third cholesteric liquid crystal material crystal material for reflecting light of a third color. The light-absorbing layer is bonded to the bottom of the third liquid crystal panel. The first double-sided adhesive buffer layer is for bonding the second liquid crystal panel to the bottom of the first liquid crystal panel, and the second double-sided adhesive buffer layer is for bonding the third liquid crystal panel to the bottom of the second liquid crystal panel.

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

[0006] U.S. Patent Publication No. US20210165255A1 discloses another prior art reflective multilayer liquid crystal display device. The display unit of the display device 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 and lower transparent electrode patterns, and a light-absorbing layer formed on the upper transparent substrate. The cholesteric liquid crystal layer is used to generate visible light within a wavelength range. The light-absorbing layer absorbs 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] U.S. Patent Publication No. US6518944B1 discloses an integrated, reflective, bi-stable cholesteric liquid crystal display and solar cell assembly for powering display electronics. The liquid crystal display includes a cholesteric liquid crystal material layer sandwiched between first and second transparent substrates. The inner surfaces of the first substrate and the second substrate combine to form the liquid crystal material layer, with the first substrate being closest to the viewer side of the display. A first conductive electrode is disposed on the inner surface of the first substrate, and a second conductive electrode is disposed on the inner surface of the second substrate. A display driver circuit is electrically coupled to the first and second conductive electrodes and is used to generate a required voltage difference between the first and second conductive electrodes. The solar cell assembly also includes a solar cell or solar panel disposed on the back surface of the second substrate and is electrically coupled to a rechargeable energy storage device (e.g., a rechargeable battery). The solar cell receives illumination passing through the first substrate, the liquid crystal material, and the second substrate, converts the illumination incident on the solar cell into electricity, and supplies power to the rechargeable energy storage device. Cholesteric liquid crystal materials allow the transmission of incident light regardless of the orientation of the liquid crystal material.

[0008] U.S. Patent Publication No. US7733447B2 discloses a liquid crystal display device that includes three stacked selectively reflective cholesteric liquid crystal layers. The device includes a first liquid crystal layer disposed on the viewing side of the device and selectively reflecting blue light. A second liquid crystal layer is disposed laterally of the first liquid crystal layer and selectively reflects green light. A third liquid crystal layer is disposed laterally of the second liquid crystal layer and selectively reflects red light. A green-cut filter layer is disposed between the green and red liquid crystal layers to selectively absorb light below 600 nm. The patent applicant claims that this configuration can reduce unwanted colors and improve display quality.

[0009] The above-mentioned prior art still does not completely solve the specific problems in the cholesteric liquid crystal display industry, so further improvements are needed. Summary of the Invention [Problem to be solved by the invention]

[0010] The object of the present invention is to provide a reflective multi-layer cholesteric liquid crystal display device with improved image quality and self-power generation. More specifically, in the prior art of U.S. Patent Publication No. US7733447B2, even if the solar cell described in U.S. Patent Publication No. US6518944B1 is placed on the bottom layer and two absorber layers, blue and green, are also placed on the bottom layer, the black solar cell cannot receive enough light and cannot generate electricity effectively. The present invention has a new structure that goes beyond the combination of the prior art U.S.7733447B2 and U.S.6518944B1 and provides many other undisclosed features and functions. [Means for solving the problem]

[0011] To achieve the above object, the first best embodiment of the present invention provides a cholesteric liquid crystal display device. The device comprises at least one first selective light-reflecting member, one first thin-film solar cell module, one second selective light-reflecting member, one second thin-film solar cell module, and one third selective light-reflecting member, stacked in this order from bottom to top. Incident light enters the cholesteric liquid crystal display device through the third selective light-reflecting member 130, where the first selective light-reflecting member, the second selective light-reflecting member, and the third selective light-reflecting member are arranged to reflect a first color component of the light, a second color component of the light, and a third color component of the light, respectively. The wavelength ranges of the first color component of the light, the second color component of the light, and the third color component of the light are different from each other. For example, the first color component of the light, the second color component of the light, and the third color component of the light can be red light, green light, and blue light, respectively. The first selective light reflecting member, the second selective light reflecting member, and the third selective light reflecting member may be a red light cholesteric liquid crystal module, a green light cholesteric liquid crystal module, and a blue light cholesteric liquid crystal module, respectively.

[0012] The first thin-film solar cell module is sandwiched between a second selective light-reflecting member and a third selective light-reflecting member, and incident light enters the first thin-film solar cell module through the underside of the third selective light-reflecting member and the top of the first thin-film solar cell module. The first thin-film solar cell module is configured to have a lower transmittance for a third color component of light than the transmittance for other light. The second thin-film solar cell module is sandwiched between the first selective light-reflecting member and a second selective light-reflecting member, and incident light enters the second thin-film solar cell module through the underside of the second selective light-reflecting member and the top of the second thin-film solar cell module. The second thin-film solar cell module is configured to have a lower transmittance for the second color component of light than the transmittance for other light. That is, the first thin-film solar cell module absorbs the third color component of light, preventing the third color component of light from entering the second selective light-reflecting member below, and instead uses the third color component of light to perform a photoelectric reaction and generate additional power. The second thin-film solar cell module absorbs the second color component of the light, preventing the second color component from being incident on the first selective light-reflecting member below, and uses the second color component of the light to perform a photoelectric reaction and generate additional power, thereby improving the screen contrast and pixel quality of the cholesteric liquid crystal display device and generating additional power.

[0013] Based on the same technical concept, another best embodiment of the present invention is a cholesteric liquid crystal display device, which includes at least a first cholesteric liquid crystal module, a first thin-film solar cell module, and a second cholesteric liquid crystal module, stacked in this order from top to bottom. Incident light is incident on the cholesteric liquid crystal display device from the top of the first cholesteric liquid crystal module, where the first cholesteric liquid crystal module and the second cholesteric liquid crystal module are arranged to reflect a first color component of the light and a second color component of the light, respectively. The wavelength range of the first color component of the light is different from the wavelength range of the second color component of the light.

[0014] The first thin-film solar cell module is sandwiched between the first cholesteric liquid crystal module and the second cholesteric liquid crystal module, and incident light is incident on the first thin-film solar cell module from the bottom of the first cholesteric liquid crystal module and the top of the first thin-film solar cell module. The first thin-film solar cell module is configured so that the transmittance of a first color component of light is lower than the transmittance of other light, particularly the transmittance of a second color component of light. That is, the first color component of light that passes through the first cholesteric liquid crystal module is absorbed by the first thin-film solar cell module and does not enter the second selective light-reflecting member installed below, but instead undergoes a photoelectric reaction via the first thin-film solar cell module and using the first color component of light. This improves the screen contrast and pixel quality of the cholesteric liquid crystal display device and can also generate additional power. [Effects of the Invention]

[0015] The cholesteric liquid crystal display device of the present invention is a reflective multi-layer cholesteric liquid crystal display device that has superior image quality with improved screen contrast and pixel quality of the cholesteric liquid crystal display device, and is capable of generating additional power and self-power generation. [Brief explanation of the drawings]

[0016] The drawings provided are intended to provide a better understanding of the embodiments of the present invention, constitute a part of the description, illustrate the embodiments of the present invention, and explain the principles of the present invention together with the text. It is clear that the drawings below are only some examples of the present invention and do not limit the implementation method of the present invention. Those skilled in the art can derive other drawings based on these drawings without any creative effort. [Figure 1] 1 is a schematic cross-sectional view of a cholesteric liquid crystal display device according to a first best embodiment of the present invention. [Figure 2] 1 is a schematic cross-sectional view of another cholesteric liquid crystal display device according to a second best embodiment of the present invention; [Figure 3]10 is a schematic diagram of another implementation method of the second best embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0017] The structure, features, and effects of the present invention will be described in detail below with reference to the best embodiment and drawings. The specific structure and function details disclosed in the present invention are merely representative and are used to explain the embodiments of the present invention. The present invention can be embodied in various modified forms and is not limited to the embodiments disclosed herein.

[0018] Terms used in this specification, such as "center," "lateral," "up," "down," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside," indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings. Except where the applicant specifically emphasizes or limits the role of a function, these terms are used merely for the convenience of describing the present invention and do not indicate or suggest a specific orientation or specific directional structure and operation of a specified device or component, and should not be construed as limiting the present invention. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and do not indicate the relative importance or number of technical features. In this description of the present invention, unless otherwise specified, "plurality" is defined as two or more than two. Furthermore, the terms "comprise" and "include" and other equivalent terms all mean "include at least."

[0019] Unless otherwise expressly specified or limited, the terms "attached," "adjacent," and "connected" in the present invention shall be interpreted broadly. For example, a fixed connection may be a detachable connection or a connection formed integrally, and may be interpreted broadly to mean a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or communication between the interiors of two components. Those skilled in the art should understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0020] In the present description, the terms "a," "an," "an" and "an" are intended to include the plural unless the context clearly dictates otherwise. Furthermore, the terms "comprise" and / or "comprise" are intended to specify the presence of stated features, steps, operations, units, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, units, components, and / or combinations thereof. [Example]

[0021] The first best embodiment of the present invention is a cholesteric liquid crystal display device 1, as shown in FIG. 1. The cholesteric liquid crystal display device 1 includes at least three selective light-reflecting members stacked in order from bottom to top. The first selective light-reflecting member 110 is arranged to reflect a first color component of light, the second selective light-reflecting member 120 is arranged to reflect a second color component of light, and the third selective light-reflecting member 130 is arranged to reflect a third color component of light. Incident light enters the cholesteric liquid crystal display device 1 through the top surface of the third selective light-reflecting member 130, and the first, second, and third color components of light have different wavelength ranges. Therefore, the first, second, and third selective light-reflecting members 110, 120, and 130 respectively reflect different color components of light. In one best embodiment, the first selective light-reflecting member 110 can be, but is not limited to, a red light cholesteric liquid crystal module, the second selective light-reflecting member 110 can be, but is not limited to, a green light cholesteric liquid crystal module, and the third selective light-reflecting member 110 can be, but is not limited to, a blue light cholesteric liquid crystal module. That is, the first light color component can be, but is not limited to, red light, the second light color component can be, but is not limited to, green light, and the third light color component can be, but is not limited to, blue light.

[0022] In this embodiment, incident light enters the cholesteric liquid crystal display device 1 from above the blue cholesteric liquid crystal module 130. After the light enters the blue cholesteric liquid crystal module 130, some of the color components of the light are reflected, while the remaining color components of the light pass through the blue cholesteric liquid crystal module 130 and enter the green cholesteric liquid crystal module 120. After the light enters the green cholesteric liquid crystal module 120, some of the color components of the light are reflected, while the remaining color components of the light pass through the green cholesteric liquid crystal module 120 and enter the red cholesteric liquid crystal module 110. After the light enters the red cholesteric liquid crystal module 110, some of the color components of the light are reflected, while the remaining color components of the light continue to pass through the red cholesteric liquid crystal module 110.

[0023] It should be understood that light can be divided into left-handed and right-handed circularly polarized light, and cholesteric liquid crystals have optical rotation. Generally, a single layer of cholesteric liquid crystal can only reflect light polarized in a single direction, such as reflecting left-handed circularly polarized light or right-handed circularly polarized light. Therefore, when one color component of light is incident on a single layer and driven cholesteric liquid crystal unit, only half of the color component of the light will be reflected, and the other half of the color component of the light will still be transmitted through the cholesteric liquid crystal unit.

[0024] In 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. In such a three-layer cholesteric liquid crystal display, the optical rotation has a more serious impact on the screen contrast and pixel quality. 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, along with other color components of the light, passes through the blue cholesteric liquid crystal module and enters the green cholesteric liquid crystal module. This 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, along with other color components of the light, passes through the green cholesteric liquid crystal module and enters the red cholesteric liquid crystal module. This affects the contrast and pixel quality of the red cholesteric liquid crystal module.

[0025] To solve the above-mentioned problems, the first best embodiment of the cholesteric liquid crystal display device 1 provided by the present invention includes a first thin-film solar cell module 140 and a second thin-film solar cell module 150. The first thin-film solar cell module 140 is sandwiched between the second selective light-reflecting member 120 and the third selective light-reflecting member 130, i.e., between the green light cholesteric liquid crystal module 120 and the blue light cholesteric liquid crystal module 130. The second thin-film solar cell module 150 is sandwiched between the first selective light-reflecting member 110 and the second selective light-reflecting member 120, i.e., between the red light cholesteric liquid crystal module 110 and the green light cholesteric liquid crystal module 120.

[0026] Incident light enters the first thin-film solar cell module 140 through the bottom surface of the blue light cholesteric liquid crystal module 130 and the top surface of the first thin-film solar cell module 140. The first thin-film solar cell module 140 is configured to have a lower transmittance for the third color component of light than the other light components, i.e., the transmittance for blue light is lower than the other light components. The first thin-film solar cell module 140 is positioned to absorb the blue light leaking from the blue light cholesteric liquid crystal module 130 and allow the other color components of light to pass through. To achieve this, the first thin-film solar cell module 140 is preferably a dye-sensitized solar cell module, which is used to capture the blue light leaking through the blue light cholesteric liquid crystal module 130 and perform a photoelectric reaction.

[0027] A dye-sensitized solar cell module requires the use of specific semiconductor materials. When the semiconductor material is irradiated with light, the ground-state electrons of the dye molecules are excited by the photons and transition to an excited state. In this embodiment, the first thin-film solar cell module 140 includes a first semiconductor material. If the first thin-film solar cell module 140 is an n-type dye-sensitized solar cell module, the first semiconductor material used is titanium dioxide (TiO2), niobium pentoxide (Nb2O5), zinc oxide (ZnO), tin oxide (SnO2), or any combination of the above materials. If the first thin-film solar cell module 140 is a p-type dye-sensitized solar cell module, the first semiconductor material used is nickel oxide (NiO), copper oxide (Cu2O), or a combination of the above materials.

[0028] In the second thin-film solar cell module 150, incident light enters the second thin-film solar cell module 150 through the bottom surface of the green light cholesteric liquid crystal module 120 and the top surface of the second thin-film solar cell module 150. The second thin-film solar cell module 150 is configured so that the transmittance of the second color component of light is lower than that of other light components, i.e., the transmittance of green light is lower than that of other light components. The second thin-film solar cell module 150 is positioned to absorb green light leaking from the green light cholesteric liquid crystal module 120 and allow other color components of light to pass through. To achieve this goal, the second thin-film solar cell module 150 is preferably a dye-sensitized solar cell module, which is used to capture the green light leaking through the green light cholesteric liquid crystal module 120 and perform a photoelectric reaction.

[0029] As mentioned above, even if the second thin-film solar cell module 150 is a dye-sensitized solar cell module, it is still necessary to include a second semiconductor material. If the second thin-film solar cell module 150 is an n-type dye-sensitized solar cell module, the second semiconductor material used will be titanium dioxide TiO2, niobium pentoxide Nb2O5, zinc oxide ZnO, tin oxide SnO2, or any combination of the aforementioned materials. If the second thin-film solar cell module 150 is a p-type dye-sensitized solar cell module, the second semiconductor material used will be nickel oxide NiO, copper oxide Cu2O, or any combination of the aforementioned materials.

[0030] It is particularly worth noting that the first thin-film solar cell module 140 and the second thin-film solar cell module 150 can both be p-type dye-sensitized solar cell modules or n-type dye-sensitized solar cell modules. Alternatively, one can be a p-type dye-sensitized solar cell module and the other can be an n-type dye-sensitized solar cell module. However, the present invention is not limited to these.

[0031] The blue light passes through the first thin-film solar cell module 140 and the blue cholesteric liquid crystal module 130, where the leaked blue light is absorbed and used in a photoelectric reaction to generate additional power. At the same time, the absorption of the leaked blue light makes the color component spectrum of the remaining light incident on the green cholesteric liquid crystal module 120 purer and cleaner, thereby improving the contrast and pixel quality of the screen displayed by the green cholesteric liquid crystal module 120 through reflection. Similarly, the green light passes through the second thin-film solar cell module 150 and the green cholesteric liquid crystal module 120, where the leaked green light is absorbed and used in a photoelectric reaction to generate additional power. At the same time, the absorption of the leaked green light makes the color component spectrum of the remaining light incident on the red cholesteric liquid crystal module 110 purer and cleaner, thereby improving the contrast and pixel quality of the screen displayed by the red cholesteric liquid crystal module 110 through reflection. This improves the overall screen contrast and pixel quality of the cholesteric liquid crystal display device 1.

[0032] The leaked blue light and leaked green light are not only absorbed but also used to generate additional power through the first thin-film solar cell module 140 and the second thin-film solar cell module 150. This additional power can be stored as the power required to drive the cholesteric liquid crystal display device 1, or can be supplied to other external devices.

[0033] Furthermore, considering optical rotation, only half of the red light incident on the red cholesteric liquid crystal module 110 is reflected, and the other half is transmitted through the red cholesteric liquid crystal module 110 and leaks. This leaked red light also affects the screen contrast and pixel quality of the cholesteric liquid crystal display device 1. As shown in FIG. 1 , in this embodiment, the cholesteric liquid crystal display device 1 further includes a light absorbing module 160, which is installed at the bottom of the red cholesteric liquid crystal module 110 and is used to absorb all of the light transmitted through the red cholesteric liquid crystal module 110. The absorption of unnecessary stray light at the back of the red cholesteric liquid crystal module 110 improves the screen contrast of the cholesteric liquid crystal display device 1.

[0034] In one embodiment, the light absorbing module 160 includes a light absorbing layer structure made of a light absorbing material, such as black foam.

[0035] In another embodiment, the light-absorbing module 160 may be a solar cell module capable of generating a photoelectric reaction, which not only absorbs light but also generates electricity using the absorbed light. This type of solar cell module is preferably a monocrystalline silicon or polycrystalline silicon solar cell module, and the surface of this type of silicon-based solar cell module is usually a darker color such as black or navy. Of course, the light-absorbing module 160 may also be a thin-film solar cell module. [Example]

[0036] Based on the same technical idea, the present invention provides a second best embodiment. A cholesteric liquid crystal display device 2 is shown in FIG.

[0037] The cholesteric liquid crystal display device 2 includes at least two stacked cholesteric liquid crystal modules: a first cholesteric liquid crystal module 210 and a second cholesteric liquid crystal module 220, which are stacked from top to bottom. Incident light enters the cholesteric liquid crystal display device 2 from the top of the first cholesteric liquid crystal module 210 and finally exits the cholesteric liquid crystal display device 2 from the bottom of the second cholesteric liquid crystal module 220.

[0038] The first cholesteric liquid crystal module 210 is used to reflect a first color component of light, and the second cholesteric liquid crystal module 220 is used to reflect a second color component of light. The wavelength ranges of the first and second color components of light are different. For example, if the first color component of light is blue, the first cholesteric liquid crystal module 210 is a blue-light cholesteric liquid crystal module that reflects blue light. The second cholesteric liquid crystal module 220 may be a green-light cholesteric liquid crystal module that reflects green light or a red-light cholesteric liquid crystal module. If the first color component of light is green, the first cholesteric liquid crystal module 210 is a green-light cholesteric liquid crystal module that reflects green light. The second cholesteric liquid crystal module 220 is a red-light cholesteric liquid crystal module that reflects red light. Generally, due to the relationship between wavelength and light transmittance, a red-light cholesteric liquid crystal module is not used as the first cholesteric liquid crystal module 210. Longer wavelengths have lower frequencies but higher transmission, while shorter wavelengths have higher frequencies but lower transmission.

[0039] Comparing red, green, and blue light, red light has the longest wavelength and the highest transmittance. Blue light has the shortest wavelength and the lowest transmittance. Green light has an intermediate wavelength and transmittance. Therefore, the blue cholesteric liquid crystal module used to reflect blue light is usually placed in the top layer of a multi-layer cholesteric liquid crystal display device, the red cholesteric liquid crystal module used to reflect red light is usually placed in the bottom layer of a multi-layer cholesteric liquid crystal display device, and the green cholesteric liquid crystal module used to reflect green light is usually placed between the blue cholesteric liquid crystal module and the red cholesteric liquid crystal module.

[0040] The cholesteric liquid crystal display device 2 further includes a first thin-film solar cell module 240, which is disposed between the first cholesteric liquid crystal module 210 and the second cholesteric liquid crystal module 220. Incident light enters the first thin-film solar cell module 240 from the bottom of the first cholesteric liquid crystal module 210 and the top surface of the first thin-film solar cell module 240.

[0041] Here, it is necessary to recall the optical rotation property of cholesteric liquid crystals. Generally, a single-layer cholesteric liquid crystal can only reflect light with a single rotation direction, either left-handed or right-handed circularly polarized light. Therefore, when one color component of light enters a single-layer, driven cholesteric liquid crystal unit, only half of the light is reflected, while the other half, the color component of the light with a different rotation direction, still passes through the cholesteric liquid crystal unit. This affects the screen contrast and pixel quality of the cholesteric liquid crystal display. The first thin-film solar cell module 240 in the cholesteric liquid crystal display 2 is used to solve this problem.

[0042] The first thin-film solar cell module 240 is preferably a dye-sensitized solar cell module, and is used to capture a first color component of light and perform a photoelectric reaction. Therefore, the first thin-film solar cell module 240 is configured to have a lower transmittance for the first color component of light than for other color components of light. For example, if the first cholesteric liquid crystal module 210 is a blue light cholesteric liquid crystal module, the first thin-film solar cell module 240 is configured to have a lower transmittance for blue light than for other color components of light. The first thin-film solar cell module 240 is used to capture and absorb the blue light that has leaked through the blue light cholesteric liquid crystal module, and transmits the other color components of light to the second cholesteric liquid crystal module 220, which reflects green light or red light. When the first cholesteric liquid crystal module 210 is a green light cholesteric liquid crystal module, the first thin-film solar cell module 240 is used to capture and absorb the green light leaking through the green light cholesteric liquid crystal module, and to direct other color components of the light to the second cholesteric liquid crystal module 220, thereby improving the contrast, screen contrast, and pixel quality of the cholesteric liquid crystal display device 2.

[0043] A dye-sensitized solar cell module requires the use of specific semiconductor materials. In this embodiment, the first thin-film solar cell module 240 includes a first semiconductor material. If the first thin-film solar cell module 240 is an n-type dye-sensitized solar cell module, the first semiconductor material used is titanium dioxide (TiO2), niobium pentoxide (Nb2O5), zinc oxide (ZnO), tin oxide (SnO2), or any combination of the above materials. If the first thin-film solar cell module 240 is a p-type dye-sensitized solar cell module, the first semiconductor material used is nickel oxide (NiO), copper oxide (Cu2O), or a combination of the above materials.

[0044] To improve light utilization efficiency, the cholesteric liquid crystal display device 2 further includes a second thin-film solar cell module 250, which can be disposed below the second cholesteric liquid crystal module 220. The second thin-film solar cell module 250 is preferably a dye-sensitized solar cell module, which captures the second color component of light and performs a photoelectric reaction. Therefore, the second thin-film solar cell module 250 is configured so that the transmittance of the second color component of light is lower than the transmittance of the other color components of light.

[0045] When the second cholesteric liquid crystal module 220 is a green light cholesteric liquid crystal module, the second thin-film solar cell module 250 is configured to have a lower transmittance for green light than for other color components of light. The second thin-film solar cell module 250 captures and absorbs the green light that has leaked after passing through the green light cholesteric liquid crystal module to perform a photoelectric reaction, while transmitting the other color components of light. When the second cholesteric liquid crystal module 220 is a red light cholesteric liquid crystal module, the second thin-film solar cell module 250 is configured to have a lower transmittance for red light than for other color components of light. The second thin-film solar cell module 250 captures and absorbs the red light that has leaked after passing through the red light cholesteric liquid crystal module to perform a photoelectric reaction, while transmitting the other color components of light.

[0046] A dye-sensitized solar cell module requires the use of a specific semiconductor material. In this embodiment, the second thin-film solar cell module 250 includes a second semiconductor material. If the second thin-film solar cell module 250 is an n-type dye-sensitized solar cell module, the second semiconductor material used is titanium dioxide (TiO2), niobium pentoxide (Nb2O5), zinc oxide (ZnO), tin oxide (SnO2), or any combination of the above materials. If the second thin-film solar cell module 250 is a p-type dye-sensitized solar cell module, the second semiconductor material used is nickel oxide (NiO), copper oxide (Cu2O), or a combination of the above materials.

[0047] When the second thin-film solar cell module 250 captures the second color component of light and undergoes a photoelectric reaction, the additional power generated is stored as power for driving the cholesteric liquid crystal display device 2 or supplied to other external devices.

[0048] 2 and 3, in one implementation, the cholesteric liquid crystal display 2 further includes a light absorbing module 260, which is located at the bottom of the cholesteric liquid crystal display 2 and is used to absorb all residual light that has passed through the first cholesteric liquid crystal module 210 and the second cholesteric liquid crystal module 220. This can improve the screen contrast of the cholesteric liquid crystal display 2.

[0049] As shown in Fig. 3, the cholesteric liquid crystal display device 2 does not have the second thin-film solar cell module 250, and the light-absorbing module 260 can be installed below the second cholesteric liquid crystal module 220. The cholesteric liquid crystal display device 2 has the second thin-film solar cell module 250, and the light-absorbing module 260 can be installed below the second thin-film solar cell module 250, as shown in Fig. 2.

[0050] In one embodiment, the light absorbing module 260 can include a light absorbing layer structure made of a light absorbing material, such as black foam.

[0051] In another implementation, the light-absorbing module 260 may be a solar cell module capable of generating a photoelectric reaction, which not only absorbs light but also generates electricity using the absorbed light to generate additional power, which can be stored to drive the cholesteric liquid crystal display device 2 or supplied to other external devices.

[0052] The detailed description of the best embodiment above is intended to more clearly explain the features and spirit of the present invention, and is not intended to limit the scope of the present invention. Even if a person skilled in the art makes changes or adjustments within the scope of the present invention, the important meaning of the present invention will not be lost, and will still be included in the scope of the present invention. [Explanation of symbols]

[0053] 1, 2 Cholesteric liquid crystal display device 110 First selective light reflecting member, red light cholesteric liquid crystal module 120 Second selective light reflecting component, green light cholesteric liquid crystal module 130 Third selective light reflecting component, blue light cholesteric liquid crystal module 140 First Thin-Film Solar Cell Module 150 Second Thin-Film Solar Cell Module 160 Optical Absorption Module 210 First cholesteric liquid crystal module 220 Second Cholesteric Liquid Crystal Module 240 First Thin-Film Solar Cell Module 250 Second Thin-Film Solar Cell Module 260 Light Absorption Module

Claims

1. A cholesteric liquid crystal display device comprising at least one first selective light-reflecting member (110), one second selective light-reflecting member (120), and one third selective light-reflecting member (130) stacked in order from bottom to top, Incident light enters the inside of the cholesteric liquid crystal display device through the third selective light reflecting member (130), and the first selective light reflecting member (110), the second selective light reflecting member (120), and the third selective light reflecting member (130) are arranged to reflect a first color component of light, a second color component of light, and a third color component of light, respectively, and the wavelength ranges of the first color component of light, the second color component of light, and the third color component of light are different from each other; One first thin-film solar cell module (140) is sandwiched between the second selective light-reflecting member (120) and the third selective light-reflecting member (130), and the first thin-film solar cell module (140) is configured so that the transmittance of the third color component of light is lower than the transmittance of other light, and A cholesteric liquid crystal display device characterized in that one second thin-film solar cell module (150) is sandwiched between the first selective light-reflecting member (110) and the second selective light-reflecting member (120), and the second thin-film solar cell module (150) is configured so that the transmittance of the color component of the second light is lower than the transmittance of other light.

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

3. 2. The cholesteric liquid crystal display device according to claim 1, wherein the first thin-film solar cell module (140) is a dye-sensitized solar cell module and is used to capture the third color component of light coming from the third selective light-reflecting member (130).

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

5. When the first thin-film solar cell module (140) is a p-type dye-sensitized solar cell module, the semiconductor material used therein is nickel oxide NiO, copper oxide Cu 2 4. The cholesteric liquid crystal display device according to claim 3, wherein the material is selected from the group consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,

6. 2. The cholesteric liquid crystal display device according to claim 1, wherein the second thin-film solar cell module (150) is a dye-sensitized solar cell module and is used to capture the second color component of the light of the second selective light-reflecting member (120).

7. 7. The cholesteric liquid crystal display device of claim 6, wherein when the second thin-film solar cell module (150) is an n-type dye-sensitized solar cell module, the semiconductor material used therein is selected from the group consisting of titanium dioxide, niobium pentoxide, zinc oxide, tin oxide, and any combination of the above materials.

8. When the second thin-film solar cell module (150) is a p-type dye-sensitized solar cell module, the semiconductor material used therein is nickel oxide NiO, copper oxide Cu 2 4. The cholesteric liquid crystal display device according to claim 3, wherein the material is selected from the group consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,

9. 2. The cholesteric liquid crystal display device according to claim 1, further comprising a light absorbing module (160) disposed below the first selective light reflecting member (110), the light absorbing module (160) absorbing light transmitted through the first selective light reflecting member (110).

10. 10. The cholesteric liquid crystal display device according to claim 9, wherein the light absorbing module (160) is a solar cell module.

11. The liquid crystal display device includes at least one first cholesteric liquid crystal module (210) and one second cholesteric liquid crystal module (220) stacked in order from top to bottom, Incident light is incident from the first cholesteric liquid crystal module (210) to the second cholesteric liquid crystal module (220), the first cholesteric liquid crystal module (210) and the second cholesteric liquid crystal module (220) are arranged to reflect a first color component of light and a second color component of light, respectively, the wavelength range of the color component of the first light is different from the wavelength range of the color component of the second light, and A cholesteric liquid crystal display device characterized in that one first thin-film solar cell module (240) is sandwiched between the first cholesteric liquid crystal module (210) and the second cholesteric liquid crystal module (220), and the first thin-film solar cell module (240) is configured so that the transmittance of the color component of the first light is lower than the transmittance of other light.

12. The cholesteric liquid crystal display device of claim 11, wherein the first thin-film solar cell module (240) is a dye-sensitized solar cell module and is used to capture the first color component of the light coming from the first cholesteric liquid crystal module (210).

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

14. When the first thin-film solar cell module (240) is a p-type dye-sensitized solar cell module, the semiconductor material used therein is nickel oxide NiO, copper oxide Cu 2 13. The cholesteric liquid crystal display device of claim 12, wherein the material is selected from the group consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27

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

16. 12. The cholesteric liquid crystal display device of claim 11, further comprising a second thin-film solar cell module (250) installed below the second cholesteric liquid crystal module (220), the second thin-film solar cell module (250) being a dye-sensitized solar cell module, and the second thin-film solar cell module (250) being configured so that the transmittance of the color component of the second light is lower than the transmittance of other light.

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

18. When the second thin-film solar cell module (250) is a p-type dye-sensitized solar cell module, the semiconductor material used therein is nickel oxide NiO, copper oxide Cu 2 17. The cholesteric liquid crystal display device of claim 16, wherein the material is selected from the group consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27

19. 12. The cholesteric liquid crystal display device according to claim 11, further comprising a light absorbing module (260) disposed below the second cholesteric liquid crystal module (220), the light absorbing module (260) absorbing light transmitted through the second cholesteric liquid crystal module (220).

20. 17. The cholesteric liquid crystal display device of claim 16, further comprising a light absorbing module (260) disposed below the second thin-film solar cell module (250), the light absorbing module (260) absorbing light transmitted through the second thin-film solar cell module (250).

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