Self-powered cholesterol liquid crystal display device in low-light environment

Abstract

The utility model discloses a self-powered cholesterol liquid crystal display device in a low-light environment, each display module of a display module comprises an upper substrate, a lower substrate and a cholesterol liquid crystal layer clamped between the upper substrate and the lower substrate, and the colors of reflected light of the cholesterol liquid crystal layers of the display modules are different from each other; the photovoltaic module is located on the side, away from the incident plane, of the display module, the power output end of the photovoltaic module is electrically connected with an electrode of at least one display module, and the photovoltaic module comprises a plurality of photovoltaic diaphragms distributed in an array mode. The photovoltaic diaphragms in array distribution are arranged at the bottom of the cholesterol liquid crystal display module, the photovoltaic diaphragms can effectively utilize light of an indoor low-light environment to supply power to the liquid crystal module, the photovoltaic device is composed of the multiple photovoltaic diaphragms, the number, arrangement and circuit connection mode of the diaphragms are flexibly designed according to the voltage requirement needed by a chip, and the manufacturing cost is reduced. Not only can the cost be reduced through standardized production of small-size diaphragms, but also the requirements of sizes and driving voltages of different display modules can be met.

Description

Technical Field

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

[0002] Cholesteric liquid crystal displays (Ch-LCDs) exhibit bistable characteristics, meaning they exist in two stable states: a focal conic state and a planar state. When a voltage is applied, the alignment of the cholesteric liquid crystal molecules can be controlled to switch between these two stable states. By utilizing the voltage applied to the cholesteric liquid crystal, it is possible to control whether light passes through or reflects specific wavelengths of light, allowing the user to maintain the displayed content without consuming power.

[0003] In a cholesteric liquid crystal display (CLCD) panel, a solar panel is used in conjunction with the back of the display. When a light source is provided to the display device, the reflected portion is used to display the image, while the portion of the light that penetrates the display panel is absorbed by the solar panel, converting light energy into electrical energy and storing it in an energy storage device. This electrical energy can then be used to power and refresh the display image without requiring external power. However, existing self-powered Cholesteric liquid crystal displays with integrated solar panels cannot function properly indoors. Firstly, ambient light in indoor environments primarily comes from lamplight or sunlight diffused indoors. Conventional solar panels have poor photoelectric conversion efficiency and cannot provide the required power supply. Secondly, Cholesteric liquid crystal displays only require voltage when refreshing the image, while the output power of a full-panel solar panel is too high, necessitating a voltage conversion device for compatibility. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a self-powered cholesterol liquid crystal display device for low-light environments.

[0005] This utility model proposes a self-powered cholesterol liquid crystal display device for low-light environments, comprising: a display module and a photovoltaic module;

[0006] The display module includes multiple display modules stacked together. Each display module includes an upper substrate, a lower substrate, and a cholesteric liquid crystal layer sandwiched between them. The color of the reflected light from the cholesteric liquid crystal layer of each display module is different.

[0007] The photovoltaic module is located on the side of the display module away from the incident surface. The photovoltaic module includes a power output terminal, which is electrically connected to the electrodes of at least one display module. The photovoltaic module includes multiple photovoltaic films distributed in an array.

[0008] Preferably, a seam is formed between two adjacent photovoltaic films, and a shielding layer is provided between the display module and the photovoltaic module to cover the seam.

[0009] Preferably, the shielding layer is located on the bottom substrate of the display module.

[0010] Preferably, the photovoltaic film has a photovoltaic active area, and the shielding layer forms multiple windows at the bottom of the display module, with the photovoltaic active area of ​​each photovoltaic module corresponding to one window.

[0011] Preferably, the shading layer is the same color as the photovoltaic active area or is black.

[0012] Preferably, the shielding layer is formed by printing ink or applying an adhesive layer.

[0013] Preferably, the photovoltaic film is adhered to the bottom substrate of the display module using OCA optical adhesive.

[0014] Preferably, the OCA optical adhesive is located on the side of the shielding layer away from the display module and covers the window.

[0015] Preferably, it also includes a light-absorbing layer, which is located on the side of the photovoltaic module away from the display module.

[0016] This utility model also includes a self-powered cholesterol liquid crystal display device for low-light environments, comprising: a display module and a photovoltaic module;

[0017] The display module includes an upper substrate, a lower substrate, and a cholesteric liquid crystal layer sandwiched between the two;

[0018] The photovoltaic module is located on the side of the display module away from the incident surface. The photovoltaic module includes a power output terminal, which is electrically connected to the electrodes of at least one display module. The photovoltaic module includes multiple photovoltaic films distributed in an array.

[0019] Preferably, a seam is formed between two adjacent photovoltaic films, and a shielding layer is provided between the display module and the photovoltaic module to cover the seam.

[0020] In this invention, a self-powered cholesteric liquid crystal display device for low-light environments is proposed. Each display module includes an upper substrate, a lower substrate, and a cholesteric liquid crystal layer sandwiched between them. The color of the reflected light from the cholesteric liquid crystal layer of each display module is different. A photovoltaic module is located on the side of the display module away from the incident surface. The power output terminal of the photovoltaic module is electrically connected to the electrodes of at least one display module. The photovoltaic module includes multiple photovoltaic films arranged in an array. By setting multiple photovoltaic films at the bottom of the cholesteric liquid crystal display module, the photovoltaic films can effectively utilize the light of the indoor low-light environment to power the liquid crystal module. Furthermore, the photovoltaic device is composed of multiple photovoltaic films. According to the voltage requirements of the chip, the number, arrangement, and circuit connection of the films can be flexibly designed. This not only reduces costs through standardized production of small-sized films but also meets the size and driving voltage requirements of different display modules. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of one embodiment of a self-powered cholesterol liquid crystal display device for low-light environments proposed in this utility model.

[0022] Figure 2 This is a schematic diagram illustrating the combination of a photovoltaic film and a shielding layer in one embodiment of a self-powered cholesterol liquid crystal display device for low-light environments proposed in this utility model.

[0023] Figure 3 This is a schematic diagram of one embodiment of a self-powered cholesterol liquid crystal display device for low-light environments proposed in this utility model.

[0024] Figure 4 This is a schematic diagram of one embodiment of a self-powered cholesterol liquid crystal display device for low-light environments proposed in this utility model.

[0025] Figure 5 This is a schematic diagram of one embodiment of a self-powered cholesterol liquid crystal display device for low-light environments proposed in this utility model.

[0026] Figure 6 This is an exploded view of one embodiment of a self-powered cholesterol liquid crystal display device for low-light environments proposed in this utility model.

[0027] Figure 7 This is a schematic diagram of one embodiment of a self-powered cholesterol liquid crystal display device for low-light environments proposed in this utility model.

[0028] Figure label:

[0029] 1. Display module; 11. Upper substrate; 12. Lower substrate; 13. Cholesterol liquid crystal layer; 21. Photovoltaic film; 22. Power output terminal; 3. Shielding layer; 31. Window; 4. OCA optical adhesive; 5. Light-absorbing layer. Detailed Implementation

[0030] Reference Figure 1 The present invention proposes a self-powered cholesterol liquid crystal display device for low-light environments, comprising: a display module and a photovoltaic module;

[0031] The display module includes multiple display modules 1 stacked together. Each display module 1 includes an upper substrate 11, a lower substrate 12 and a cholesteric liquid crystal layer 13 sandwiched between them. The color of the reflected light from the cholesteric liquid crystal layer 13 of each display module 1 is different.

[0032] The photovoltaic module is located on the side of the display module away from the incident surface. The photovoltaic module includes a power output terminal 22, which is electrically connected to the electrodes of at least one display module 1. The photovoltaic module includes a plurality of photovoltaic films 21 distributed in an array.

[0033] In the specific operation of the low-light environment self-powered cholesteric liquid crystal display device in this embodiment, during the display process, multiple display modules are sequentially arranged above the photovoltaic module to display using ambient light. Ambient light shines into multiple cholesteric liquid crystal modules sequentially from above the top display module, and the light reflected by the multiple cholesteric liquid crystal modules is then emitted from the upper surface of the top cholesteric liquid crystal module and enters the user's eyes.

[0034] In the actual design of a single liquid crystal module, electrode layers are provided on both the upper and lower substrates, with a cholesteric liquid crystal layer sandwiched between the two electrode layers. Applying an appropriate voltage to the cholesteric liquid crystal layer through the two electrodes causes the arrangement of cholesteric liquid crystal molecules within the layer to rotate, thereby controlling the state of the liquid crystal molecules and achieving the switching between incident light reflection and transmission. During liquid crystal module display, a voltage is applied to the cholesteric liquid crystal layer between the two substrates through the electrodes, causing the arrangement of cholesteric liquid crystal molecules within the layer to rotate, thus reflecting the incident light entering the cholesteric liquid crystal layer. Light passing through multiple cholesteric liquid crystal modules enters the photovoltaic module at the bottom, where the photovoltaic film converts the ambient light energy into electrical energy, which is then used by a control chip to power the electrodes of the upper cholesteric liquid crystal modules. Preferably, the power output terminal is electrically connected to the electrodes on each liquid crystal module substrate, enabling display requirements to be met without external power supply.

[0035] Different sizes and functions of cholesteric liquid crystals require different voltages for their chips to operate. The output power of a full-area solar panel is too high, necessitating a voltage reduction adapter. The photovoltaic films are arranged in an array, allowing for flexible design of series and parallel circuit connections between multiple photovoltaic films according to the chip's voltage requirements, thus meeting the self-powering needs of different cholesteric liquid crystal products.

[0036] In this embodiment, the proposed low-light environment self-powered cholesteric liquid crystal display device comprises an upper substrate, a lower substrate, and a cholesteric liquid crystal layer sandwiched between them, with each display module reflecting a different color of light. A photovoltaic module is located on the side of the display module away from the incident surface, and its power output terminal is electrically connected to the electrodes of at least one display module. The photovoltaic module includes multiple photovoltaic films arranged in an array. By setting an array of photovoltaic films at the bottom of the cholesteric liquid crystal display module, the photovoltaic films can effectively utilize the light of the indoor low-light environment to power the liquid crystal module. Furthermore, the photovoltaic device is composed of multiple photovoltaic films, and the number, arrangement, and circuit connection of the films can be flexibly designed according to the voltage requirements of the chip. This not only reduces costs through standardized production of small-sized films but also meets the size and driving voltage requirements of different display modules.

[0037] In a specific implementation, when the cholesteric liquid crystal display module displays a black screen, the upper liquid crystal layer is in a transparent state, and the incident light is absorbed by the photovoltaic module. The black screen is actually presented by the photovoltaic module. In this embodiment, the photovoltaic module is composed of an array of photovoltaic films. When a seam is formed between two adjacent photovoltaic films, a black screen cannot be displayed at the seam location, affecting the display image and making the display defect caused by the seam easily observable to the human eye. Therefore, referring to… Figure 2 and 3 A shielding layer 3 is provided between the display module and the photovoltaic module to cover the splicing seam.

[0038] In one specific embodiment, the shielding layer 3 is located on the bottom substrate of the display module. While ensuring the light-receiving area of ​​the display areas of the multiple liquid crystal modules in the upper layer, the shielding layer effectively blocks the splicing seams between the photovoltaic films, ensuring the uniformity of the display when displaying a black screen. In actual design, the bottom substrate of the display module can be the lower substrate of the bottommost display module, or it can be a base plate separately set on the bottommost display module.

[0039] In the specific design of the shielding layer, the photovoltaic film 21 has a photovoltaic active area, and the shielding layer 3 forms multiple windows 31 at the bottom of the display module, with each photovoltaic module's photovoltaic active area corresponding to one window 31. When selecting the color of the shielding layer, the shielding layer 3 is either the same color as the photovoltaic active area or black. For ease of processing, the shielding layer 3 is formed by printing ink or applying an adhesive layer.

[0040] Reference Figure 4 In other specific embodiments, to reduce the impact of the interface between the photovoltaic film and the display module on light, the photovoltaic film 21 is adhered to the bottom substrate of the display module using OCA optical adhesive 4. Specifically, the OCA optical adhesive 4 is located on the side of the shielding layer 3 away from the display module and covers the window 31. Figure 5 As shown, in the specific processing, a shielding layer can be formed on the lower substrate of the bottom display module first, then an OCA optical adhesive layer can be covered on the shielding layer, and finally the photovoltaic film array can be pasted on the substrate with OCA optical adhesive.

[0041] In another specific embodiment, the display device of this embodiment further includes a light-absorbing layer 5, which is located on the side of the photovoltaic module away from the display module. The design of the light-absorbing layer further ensures the display effect of black screen and improves the display contrast. The light-absorbing layer can adopt a separate film layer structure, or it can protect the photovoltaic film at the bottom of the photovoltaic module.

[0042] Furthermore, in the specific electrical connection between the photovoltaic module and the display module, each photovoltaic film is electrically connected to the power output terminal. Specifically, a busbar can be designed to connect different films, allowing the converted current to be aggregated and output through the busbar. In practical design, the photovoltaic module may include a switching element that provides power to multiple cholesteric liquid crystal modules in a timely manner according to the screen switching signal for screen switching. For example, this switching element can be a transistor switch. In addition, an energy storage unit can be set to store the electrical energy generated by the photovoltaic unit to power the multiple cholesteric liquid crystal modules. The energy storage unit can be located inside the photovoltaic module or externally.

[0043] In the specific design of a multilayer cholesteric liquid crystal display device, a three-layer liquid crystal module structure can be adopted to achieve full-color display. The cholesteric liquid crystal layers of the three liquid crystal modules can reflect red, green, and blue light respectively. Through light mixing control, full-color display based on the three primary colors of red, green, and blue can be achieved. Specifically, the top layer liquid crystal module displays blue light, with a liquid crystal reflection wavelength of 400-500nm; the middle layer liquid crystal module displays green light, with a liquid crystal reflection wavelength of 500-600nm; and the bottom layer liquid crystal module displays red light, with a liquid crystal reflection wavelength of 600-700nm. The reflection wavelength of the liquid crystal layer is closely related to the rotation pitch of the cholesteric liquid crystal. If the rotation pitch of the cholesteric liquid crystal is the same as the wavelength of a certain color of light, it can reflect light of that color when the cholesteric liquid crystal is energized and rotates. Correspondingly, the liquid crystal rotation pitch of the blue cholesteric liquid crystal layer is 200-370nm, the liquid crystal rotation pitch of the green cholesteric liquid crystal layer is 260-450nm, and the liquid crystal rotation pitch of the red cholesteric liquid crystal layer is 320-540nm.

[0044] like Figure 6As shown, this embodiment also proposes a self-powered cholesterol liquid crystal display device for low-light environments, including: a display module and a photovoltaic module;

[0045] The display module includes an upper substrate 11, a lower substrate 12, and a cholesteric liquid crystal layer 13 sandwiched between the two.

[0046] The photovoltaic module is located on the side of the display module away from the incident surface. The photovoltaic module includes a power output terminal 22, which is electrically connected to the electrodes of at least one display module 1. The photovoltaic module includes a plurality of photovoltaic films 21 distributed in an array.

[0047] Furthermore, a seam is formed between two adjacent photovoltaic films 21, and a shielding layer 3 is provided between the display module and the photovoltaic module to shield the seam.

[0048] The display device in this embodiment may also include a single-layer liquid crystal module, the technical effect of which is similar to that of the above embodiment, and will not be described again here.

[0049] In practical design, this embodiment can use a low-light photovoltaic film to adapt to indoor low-light environments. Its structure includes two PET layers on both sides, with a conductive layer inside each PET layer. Between the two conductive layers are an active layer and an ETL (electron transport layer). The ETL layer, located between the conductive and active layers, collects and transports electrons and prevents holes from entering the conductive layers. The active layer, composed of a donor material and an acceptor material, is the most important part of the organic solar cell, responsible for light absorption and the generation and separation of excitons.

[0050] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A self-powered cholesteric liquid crystal display device in a low light environment, characterized by, Comprise: a display module and a photovoltaic module; the display module comprises a plurality of display modules (1) arranged in layers, each display module (1) comprising an upper substrate (11), a lower substrate (12) and a cholesteric liquid crystal layer (13) sandwiched therebetween, the color of the reflected light of the cholesteric liquid crystal layer (13) of each display module (1) being different from each other; the photovoltaic module is located on the side of the display module away from the incident plane, and the photovoltaic module comprises a power output end (22), the power output end (22) is electrically connected with the electrode of at least one display module (1), and the photovoltaic module comprises a plurality of photovoltaic film pieces (21) arranged in an array.

2. The self-powered cholesteric liquid crystal display device in a micro-light environment according to claim 1, wherein, A splicing joint is formed between two adjacent photovoltaic film pieces (21), and a shielding layer (3) is arranged between the display module and the photovoltaic module for shielding the splicing joint.

3. The self-powered cholesteric liquid crystal display device in a micro-light environment according to claim 2, wherein, The shielding layer (3) is located on the bottom substrate of the display module.

4. The self-powered cholesteric liquid crystal display device in a micro-light environment according to claim 2, wherein, The photovoltaic film piece (21) is provided with a photovoltaic active area, and the shielding layer (3) forms a plurality of windows (31) at the bottom of the display module, and the photovoltaic active area of each photovoltaic module corresponds to a window (31).

5. The self-powered cholesteric liquid crystal display device in a micro-light environment according to claim 4, wherein, The shielding layer (3) is the same color as the photovoltaic active area or black.

6. The self-powered cholesteric liquid crystal display device in a micro-light environment according to claim 5, wherein, The shielding layer (3) is formed by printing ink or attaching a glue layer.

7. The self-powered cholesteric liquid crystal display device in a micro-light environment according to claim 4, wherein, The photovoltaic film piece (21) is pasted on the bottom substrate of the display module by OCA optical glue (4).

8. The self-powered cholesteric liquid crystal display device in a micro-light environment according to claim 7, wherein, The OCA optical glue (4) is located on the side of the shielding layer (3) away from the display module and covers the window (31).

9. The self-powered cholesteric liquid crystal display device in a micro-light environment according to claim 1 or 2, wherein, Further comprising an optical absorption layer (5), the optical absorption layer (5) is located on the side of the photovoltaic module away from the display module.

10. A self-powered cholesteric liquid crystal display device in a low light environment, characterized in that, Comprise: a display module and a photovoltaic module; the display module comprises an upper substrate (11), a lower substrate (12) and a cholesteric liquid crystal layer (13) sandwiched therebetween; the photovoltaic module is located on the side of the display module away from the incident plane, and the photovoltaic module comprises a power output end (22), the power output end (22) is electrically connected with the electrode of at least one display module (1), and the photovoltaic module comprises a plurality of photovoltaic film pieces (21) arranged in an array; A splicing joint is formed between two adjacent photovoltaic film pieces (21), and a shielding layer (3) is arranged between the display module and the photovoltaic module for shielding the splicing joint.

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