Cholesteric liquid crystal display

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 particularly to the optical structure of a cholesteric liquid crystal display device.

Background Art

[0002] Based on the applied electric field, a cholesteric liquid crystal display device can form a planar structure that reflects external light or a focal conic structure that allows the transmission of external light. Even when the electric field is not maintained, the cholesteric liquid crystal display device can maintain the conventional corresponding structure. Therefore, the cholesteric liquid crystal display device has bistable characteristics, and based on the bistable characteristics, the cholesteric liquid crystal display device is used as an electronic paper display device.

[0003] By setting an appropriate helical pitch of cholesteric liquid crystal molecules and the wavelength of incident light, a cholesteric liquid crystal display device can also perform color display. In the prior art of a cholesteric liquid crystal display device with multi-layer liquid crystals, U.S. Patent Publication No. US6597419B1 discloses a reflective multi-layer liquid crystal display device having a blue liquid crystal light control layer, a green liquid crystal light control layer, and a red liquid crystal light control layer, which are laminated in this order from the observation side. The full width at half maximum of the reflection spectrum of any liquid crystal light control layer is larger than that of the liquid crystal light control layer adjacent to the observation side. In addition, the maximum reflectance of the reflection spectrum of any liquid crystal light control layer is higher than the reflectance of the liquid crystal light control layer adjacent to the observation side. In one embodiment, in the XYZ color space, when all the liquid crystal light control layers are in the reflection state of the maximum reflectance, the chromaticity coordinates of the displayed color are located within a range of a distance of 0.02 from the chromaticity coordinates of the standard white point.

[0004] U.S. Patent Publication No. US20120274887Å1 discloses prior art for another reflective multilayer liquid crystal display device. The 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 for reflecting light of a first color. The second liquid crystal panel includes a second cholesteric liquid crystal material for reflecting light of a second color. The third liquid crystal panel includes a third cholesteric liquid 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] U.S. Patent Publication No. US2013222749Å1 discloses prior art for another reflective multilayer liquid crystal display device. The display device includes an upper substrate, a lower substrate, a plurality of isolation structures, and a plurality of photoreactive liquid crystals. The lower and upper substrates are placed opposite each other. The isolation structures are placed between the upper and lower substrates and are used to form a plurality of passages between the upper and lower substrates. Each photoreactive liquid crystal is placed within its respective passage. The upper substrate is used to block ultraviolet light.

[0006] U.S. Patent Publication No. US20210165255A1 discloses prior art for another reflective multilayer liquid crystal display device. The display unit of the 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 US6518944B1 discloses an integrated, reflective bistable cholesteric liquid crystal display and a solar cell component that supplies power to a display electronic device. The liquid crystal display includes a cholesteric liquid crystal material layer sandwiched between first and second transparent substrates. The inner surfaces of the first and second substrates bond the liquid crystal material layer, and the first substrate is closest to the observer side of the display device. A first conductive electrode is placed on the inner surface of the first substrate, and a second conductive electrode is placed 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 the necessary voltage difference between the first and second conductive electrodes. The provided solar cell component includes a solar cell or solar cell panel placed on the back 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 arrangement of the liquid crystal materials.

[0008] U.S. Patent Publication US7733447B2 discloses a liquid crystal display device consisting of three stacked selectively reflective cholesteric liquid crystal layers. The first liquid crystal layer is positioned on the observation side of the device and selectively reflects blue light. The second liquid crystal layer is positioned alongside the first and selectively reflects green light. The third liquid crystal layer is positioned alongside the second and selectively reflects red light. A green-cut filter layer is placed between the green and red liquid crystal layers to selectively absorb light rays below 600 nm. According to the patent applicant, this configuration can reduce unwanted colors and improve display quality.

[0009] The aforementioned conventional technologies still do not completely solve the specific problems in the cholesteric liquid crystal display industry, and therefore further improvements are needed. [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] The object of the present invention is to provide a reflective multilayer cholesteric liquid crystal display device that has superior image quality and is capable of generating its own power. More specifically, in the prior art described in the above-mentioned U.S. Patent Publication US7733447B2, even if a solar cell as described in U.S. Patent Publication US6518944B1 is placed in the bottom layer and two absorption layers, blue and green, are also installed, if a black solar cell is placed in the bottom layer, it cannot receive enough light and cannot generate power effectively. The present invention is a new structure that goes beyond the combination of the prior art US7733447B2 and US6518944B1 and provides many other previously undisclosed features and functions. [Means for solving the problem]

[0011] To solve the above-mentioned objectives, the first best embodiment submitted by the present invention is a cholesteric liquid crystal display device. It comprises at least one first selective light reflector, one first thin-film solar cell module, one second selective light reflector, one second thin-film solar cell module, and one third selective light reflector, stacked in order from bottom to top. Incident light enters the interior of the cholesteric liquid crystal display device through the third selective light reflector 130, and within it, the first selective light reflector, the second selective light reflector, and the third selective light reflector are arranged to reflect the first, second, and third color components of light, respectively. The wavelength ranges of the first, second, and third color components of light are all different. For example, the first, second, and third color components of 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 can be a cholesteric liquid crystal module for red light, a cholesteric liquid crystal module for green light, and a cholesteric liquid crystal module for blue light, respectively.

[0012] The first thin-film solar cell module is sandwiched between the second selective light reflecting member and the third selective light reflecting member, and incident light enters the first thin-film solar cell module from the lower surface of the third selective light reflecting member and the upper surface of the first thin-film solar cell module. The first thin-film solar cell module is configured such that the transmittance of the third color component of light is lower than the transmittance of other light. The second thin-film solar cell module is sandwiched between the first selective light reflecting member and the second selective light reflecting member, and incident light enters the second thin-film solar cell module from the lower surface of the second selective light reflecting member and the upper surface of the second thin-film solar cell module. The second thin-film solar cell module is configured such that the transmittance of the second color component of light is lower than the transmittance of other light. That is, the first thin-film solar cell module absorbs the third color component of light, so that the third color component of light does not enter the second selective light reflecting member below it, and a photoelectric reaction is carried out using the third color component of light to generate additional power. The second thin-film solar cell module absorbs the second color component of light, preventing it from entering the first selective light-reflecting member below. Furthermore, it utilizes the second color component to perform a photoelectric reaction, generating additional power. Therefore, in addition to improving the screen contrast and pixel quality of the cholesteric liquid crystal display device, additional power can also be generated.

[0013] Based on a similar technical concept, another best embodiment provided by the present invention is a cholesteric liquid crystal display device. It includes at least one first cholesteric liquid crystal module, one first thin-film solar cell module, and one second cholesteric liquid crystal module stacked from top to bottom. Incident light enters the cholesteric liquid crystal display device from the top surface of the first cholesteric liquid crystal module, and the first cholesteric liquid crystal module and the second cholesteric liquid crystal module are arranged to reflect a first color component of light and a second color component of light, respectively. The wavelength range of the first color component of light is different from the wavelength range of the second color component of 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 enters the first thin-film solar cell module from the bottom surface of the first cholesteric liquid crystal module and the top surface of the first thin-film solar cell module. The first thin-film solar cell module is configured such that the transmittance of the first color component of light is lower than the transmittance of other light, especially the transmittance of the second color component of light. That is, the first color component of light that passes through and leaks from 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 utilizing the first color component of light. This improves the screen contrast and pixel quality of the cholesteric liquid crystal display device and also enables the generation of additional power. [Effects of the Invention]

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

[0016] The provided drawings are for further understanding of embodiments of the present invention, constitute part of the description, illustrate embodiments of the present invention, and explain the principles of the present invention together with the text. It is clear that the following drawings are some embodiments of the present invention and do not limit the methods of carrying out the invention. Other drawings can be derived from these drawings without any creative effort by a person with ordinary skill in the art. [Figure 1] This is the first best embodiment of the present invention, and is a schematic cross-sectional view of a cholesteric liquid crystal display device. [Figure 2] This is a second best embodiment of the present invention, and is a schematic cross-sectional view of another cholesteric liquid crystal display device. [Figure 3]This is a schematic diagram of another method of carrying out the second best embodiment of the present invention. [Modes for carrying out 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 structural and functional details disclosed in this invention are representative only and are used to explain 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] The terms used in this invention, such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside,” which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. Unless the applicant specifically emphasizes or limits the role of its function, these terms are merely for the convenience of describing the invention and do not indicate or suggest a specific orientation or specific orientational structure and operation for the specified device or component, nor should they be considered to limit the invention. Furthermore, “first” and “second” are used for descriptive purposes only and do not indicate relative importance or the number of technical features. In the description of this invention, unless otherwise stated, “multiple” is defined as two or more. Also, “including” and other paraphrases all mean “including at least.”

[0019] Unless otherwise explicitly stated or limited, the terms “attach,” “adjacent,” and “connect” in this invention shall be interpreted broadly. For example, a fixed connection may be a detachable connection or a connection formed by integral molding, and may be interpreted broadly as a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate mediator, or communication between the internals of two components. A person with ordinary skill in the art should understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In the context, unless otherwise clearly described in the context, the terms "one" and "a term" in the description of the present invention shall include pluralities. Further, the terms "comprising" and / or "including" are to define the presence of the described features, steps, operations, units, or / or members, and it should be understood that they do not exclude the presence or addition of one or more other features, steps, operations, units, members and / or combinations thereof.

Example

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

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

[0023] It should be understood that light has left-circular polarization and right-circular polarization, and cholesteric liquid crystals possess optical activity. Generally, a single-layer cholesteric liquid crystal can reflect only unidirectional polarization, such as reflecting left-circularly polarized light or right-circularly polarized light. Therefore, when a single color component of light enters a single-layer, driven cholesteric liquid crystal unit, only half of the color component of the light is reflected, while the remaining half is transmitted through the cholesteric liquid crystal unit.

[0024] In a conventional three - layer cholesteric liquid crystal display device, the layers stacked from bottom to top are a cholesteric liquid crystal module for red light, a cholesteric liquid crystal module for green light, and a cholesteric liquid crystal module for blue light. In such a cholesteric liquid crystal display device with a three - layer structure, the influence of optical rotatory power on the screen contrast and pixel quality is more profound. When external light enters the cholesteric liquid crystal module for blue light, only about half of the blue light is reflected, and the remaining half of the blue light, together with the color components of other lights, passes through the cholesteric liquid crystal module for blue light and enters the cholesteric liquid crystal module for green light. Therefore, it affects the contrast and pixel quality of the cholesteric liquid crystal module for green light. Similarly, when light enters the cholesteric liquid crystal module for green light, only about half of the green light is reflected, and the remaining half of the green light, together with the color components of other lights, passes through the cholesteric liquid crystal module for green light and enters the cholesteric liquid crystal module for red light. Therefore, it affects the contrast and pixel quality of the cholesteric liquid crystal module for red light.

[0025] To solve the above problems, in the first preferred embodiment of the cholesteric liquid crystal display device 1 provided by the present invention, it includes one first thin - film solar cell module 140 and one 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. That is, it is between the cholesteric liquid crystal module 120 for green light and the cholesteric liquid crystal module 130 for blue light. 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. That is, it is between the cholesteric liquid crystal module 110 for red light and the cholesteric liquid crystal module 120 for green light.

[0026] The incident light enters the first thin-film solar cell module 140 through the lower surface of the blue light cholesteric liquid crystal module 130 and the upper surface of the first thin-film solar cell module 140. The first thin-film solar cell module 140 is configured such that the transmittance of the third color component of light is lower than that of other light, i.e., the transmittance of blue light is lower than that of other light. The arrangement of the first thin-film solar cell module 140 is to absorb the blue light leaked from the blue light cholesteric liquid crystal module 130 and allow the other color components of light to pass through. To achieve this objective, it is preferable to select a dye-sensitized solar cell module for the first thin-film solar cell module 140, which is used to capture the blue light leaked 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 a specific semiconductor material. When the semiconductor material is irradiated with light, the electrons in the ground state 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. When the first thin-film solar cell module 140 is selected as 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. When the first thin-film solar cell module 140 is selected as 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 lower surface of the green light cholesteric liquid crystal module 120 and the upper surface of the second thin-film solar cell module 150. The second thin-film solar cell module 150 is configured such that the transmittance of the second color component of light is lower than that of other light, i.e., the transmittance of green light is lower than that of other light. The arrangement of the second thin-film solar cell module 150 is to absorb the green light leaked from the green light cholesteric liquid crystal module 120 and allow the color components of other light to pass through. To achieve this objective, it is preferable to select a dye-sensitized solar cell module for the second thin-film solar cell module 150, which is used to capture the green light leaked through the green light cholesteric liquid crystal module 120 and to perform a photoelectric reaction.

[0029] As described 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. When the second thin-film solar cell module 150 is selected as 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 above materials. When the second thin-film solar cell module 150 is selected as a p-type dye-sensitized solar cell module, the second semiconductor material used will be nickel oxide (NiO), copper oxide (Cu2O), or a combination of the above materials.

[0030] Of particular note is that the first thin-film solar cell module 140 and the second thin-film solar cell module 150 can simultaneously select a p-type dye-sensitized solar cell module, or simultaneously select an n-type dye-sensitized solar cell module. Furthermore, one can use a p-type dye-sensitized solar cell module while the other uses an n-type dye-sensitized solar cell module. The present invention is not limited to these possibilities.

[0031] Blue light is transmitted through the first thin-film solar cell module 140 to the blue light cholesteric liquid crystal module 130. The leaked blue light is absorbed and used in the photoelectric reaction to generate additional power. Simultaneously, because the leaked blue light is absorbed, the color component spectrum of the remaining light incident on the green light cholesteric liquid crystal module 120 becomes purer and cleaner, thereby improving the contrast and pixel quality of the screen displayed by the green light cholesteric liquid crystal module 120 through reflection. Similarly, green light is transmitted through the second thin-film solar cell module 150 to the green light cholesteric liquid crystal module 120. The leaked green light is absorbed and used in the photoelectric reaction to generate additional power. Simultaneously, because the leaked green light is absorbed, the color component spectrum of the remaining light incident on the red light cholesteric liquid crystal module 110 becomes purer and cleaner, thereby improving the contrast and pixel quality of the screen displayed by the red light cholesteric liquid crystal module 110 through reflection. Thus, the overall screen contrast and pixel quality of the cholesteric liquid crystal display device 1 are also improved.

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

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

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

[0035] In another embodiment, the light absorption 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 made of monocrystalline silicon or polycrystalline silicon, and the surface of this type of silicon-based solar cell module typically exhibits a darker color, such as black or navy blue. Of course, the light absorption module 160 may also be a thin-film type solar cell module. [Examples]

[0036] Based on a similar technical concept, the present invention provides a second best embodiment. Figure 2 shows a cholesteric liquid crystal display device 2.

[0037] The cholesteric liquid crystal display device 2 includes at least two stacked cholesteric liquid crystal modules. These are a first cholesteric liquid crystal module 210 and a second cholesteric liquid crystal module 220, 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 the first color component of light, and the second cholesteric liquid crystal module 220 is used to reflect the 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 light, the first cholesteric liquid crystal module 210 is a blue light cholesteric liquid crystal module that reflects blue light. In this case, 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 light, the first cholesteric liquid crystal module 210 is a green light cholesteric liquid crystal module that reflects green light. In this case, 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 result in lower frequencies but higher transmittance. Conversely, shorter wavelengths result in higher frequencies but lower transmittance.

[0039] When 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 a wavelength and transmittance that are in between. Therefore, a blue light cholesteric liquid crystal module used to reflect blue light is usually placed on the top layer of a multilayer cholesteric liquid crystal display, a red light cholesteric liquid crystal module used to reflect red light is usually placed on the bottom layer of a multilayer cholesteric liquid crystal display, and a green light cholesteric liquid crystal module used to reflect green light is usually placed between the blue light cholesteric liquid crystal module and the red light cholesteric liquid crystal module.

[0040] The cholesteric liquid crystal display device 2 further includes a first thin-film solar cell module 240, which is positioned 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 reiterate the optical activity of cholesteric liquid crystals. Generally, a single-layer cholesteric liquid crystal can only reflect light with a single direction of rotation, either left-circularly polarized light or right-circularly polarized light. Therefore, when a single color component of light enters a single-layer, driven cholesteric liquid crystal unit, only half of the light's color component is reflected, while the remaining half, with different rotational directions, still passes through the cholesteric liquid crystal unit. This affects the screen contrast and pixel quality of the cholesteric liquid crystal display device. The first thin-film solar cell module 240 in the cholesteric liquid crystal display device 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 the first color component of light and perform a photoelectric reaction. Therefore, the first thin-film solar cell module 240 is configured such that the transmittance of the first color component of light is lower than the transmittance of the other color components of light. For example, if the first cholesteric liquid crystal module 210 is a cholesteric liquid crystal module for blue light, the first thin-film solar cell module 240 is configured such that the transmittance of blue light is lower than the transmittance of the 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 cholesteric liquid crystal module for blue light, and also causes the other color components of light to be incident on the second cholesteric liquid crystal module 220 to reflect green light or red light. When the first cholesteric liquid crystal module 210 is a cholesteric liquid crystal module for green light, the first thin-film solar cell module 240 is used to capture and absorb the green light that has leaked through the cholesteric liquid crystal module for green light, and also causes other color components of light to be incident on the second cholesteric liquid crystal module 220 to reflect red light. This improves the contrast, screen contrast, and pixel quality of the cholesteric liquid crystal display device 2.

[0043] The 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. When the first thin-film solar cell module 240 is selected as 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. When the first thin-film solar cell module 240 is selected as 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 the efficiency of light utilization, the cholesteric liquid crystal display device 2 may further include a second thin-film solar cell module 250, which can be positioned 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 such that the transmittance of the second color component of light is lower than the transmittance of the other color components of light.

[0045] If the second cholesteric liquid crystal module 220 is a cholesteric liquid crystal module for green light, the second thin-film solar cell module 250 is configured such that the transmittance of green light is lower than the transmittance of other color components of light. The second thin-film solar cell module 250 is intended to capture and absorb the green light that leaks through the cholesteric liquid crystal module for green light and perform a photoelectric reaction, while allowing other color components of light to pass through. If the second cholesteric liquid crystal module 220 is a cholesteric liquid crystal module for red light, the second thin-film solar cell module 250 is configured such that the transmittance of red light is lower than the transmittance of other color components of light. The second thin-film solar cell module 250 is intended to capture and absorb the red light that leaks through the cholesteric liquid crystal module for red light and perform a photoelectric reaction, while allowing other color components of light to pass through.

[0046] The dye-sensitized solar cell module requires the use of specific semiconductor materials. In this embodiment, the second thin-film solar cell module 250 includes a second semiconductor material. When the second thin-film solar cell module 250 is selected as 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. When the second thin-film solar cell module 250 is selected as 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 performs 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] As shown in Figures 2 and 3, in one embodiment, the cholesteric liquid crystal display device 2 further includes a light absorption module 260, which is installed at the bottom of the cholesteric liquid crystal display device 2 and 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 improves the screen contrast of the cholesteric liquid crystal display device 2.

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

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

[0051] In another embodiment, the light absorption 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 produce additional power. This additional power 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 embodiments above is intended to more clearly illustrate the features and spirit of the present invention and is not intended to limit the scope of the invention. Even if a person familiar with the art makes changes or adjustments within the scope of the invention, the important significance of the invention will not be lost and will remain within the scope of the invention. [Explanation of symbols]

[0053] 1, 2 Cholesteric Liquid Crystal Display 110 First selective light reflecting member, cholesteric liquid crystal module for red light 120 Second Selective Light Reflecting Component, Cholesteric Liquid Crystal Module for Green Light 130 Third-selective light-reflecting component, cholesteric liquid crystal module for blue light 140 First Thin-Film Solar Cell Module 150 Second Thin-Film Solar Cell Module 160 Light Absorption Modules 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 Modules

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, The incident light enters the cholesteric liquid crystal display device from 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 the first, second, and third color components of light, respectively, and the wavelength ranges of the first, second, and third color components of light are different. 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 such that the transmittance of the third light color component 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 such that the transmittance of the second light color component is lower than the transmittance of other light.

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

4. The cholesteric liquid crystal display device according to claim 3, characterized in that, 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. If the first thin-film solar cell module (140) is a p-type dye-sensitized solar cell module, the semiconductor materials used therein are nickel oxide (NiO) and copper oxide (Cu). 2 The cholesteric liquid crystal display device according to claim 3, characterized in that it is selected from the group consisting of O and combinations of the aforementioned materials.

6. The cholesteric liquid crystal display device according to claim 1, characterized in that 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 light of the second selective light reflecting member (120).

7. The cholesteric liquid crystal display device according to claim 6, characterized in that, 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. If the second thin-film solar cell module (150) is a p-type dye-sensitized solar cell module, the semiconductor materials used therein are nickel oxide (NiO) and copper oxide (Cu). 2 The cholesteric liquid crystal display device according to claim 6, characterized in that it is selected from the group consisting of O and combinations of the aforementioned materials.

9. 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), wherein the light-absorbing module (160) absorbs light transmitted through the first selective light-reflecting member (110).

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

11. It includes at least one first cholesteric liquid crystal module (210) and one second cholesteric liquid crystal module (220) stacked from top to bottom, Incident light enters the second cholesteric liquid crystal module (220) from the first cholesteric liquid crystal module (210), and the first cholesteric liquid crystal module (210) and the second cholesteric liquid crystal module (220) are arranged to reflect a first color component and a second color component of light, respectively, and the wavelength range of the first color component of light is different from the wavelength range of the second color component of 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 such that the transmittance of the first color component of light is lower than the transmittance of other light.

12. The cholesteric liquid crystal display device according to claim 11, characterized in that 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 light coming from the first cholesteric liquid crystal module (210).

13. The cholesteric liquid crystal display device according to claim 12, characterized in that, 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 above materials.

14. If the first thin-film solar cell module (240) is a p-type dye-sensitized solar cell module, the semiconductor materials used therein are nickel oxide (NiO) and copper oxide (Cu). 2 The cholesteric liquid crystal display device according to claim 12, characterized in that it is selected from the group consisting of O and combinations of the aforementioned materials.

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

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

17. The cholesteric liquid crystal display device according to claim 16, characterized in that, 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 above materials.

18. If the second thin-film solar cell module (250) is a p-type dye-sensitized solar cell module, the semiconductor materials used therein are nickel oxide (NiO) and copper oxide (Cu). 2 The cholesteric liquid crystal display device according to claim 16, characterized in that it is selected from the group consisting of O and combinations of the aforementioned materials.

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

20. The cholesteric liquid crystal display device according to claim 16, further comprising a light-absorbing module (260) installed below the second thin-film solar cell module (250), wherein the light-absorbing module (260) absorbs light transmitted through the second thin-film solar cell module (250).

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