Electronic paper display screen, driving display circuit and air conditioner

Abstract

The embodiment of the invention provides an electronic paper display screen, a driving display circuit and an air conditioner. The electronic paper display screen comprises a first substrate and a second substrate, the liquid crystal layer is located between the first substrate and the second substrate; the grating is located between the liquid crystal layer and the second substrate; the optical waveguide structure comprises a first optical waveguide layer and a second optical waveguide layer, the first optical waveguide layer is located between the grating and the second substrate, and the second optical waveguide layer is located on the side of the liquid crystal layer and located below the first substrate; the lens is located between the second optical waveguide layer and the first substrate; the optical waveguide structure receives light passing through the first substrate, the liquid crystal layer and the grating through the first optical waveguide layer, and the light is emitted towards the first substrate after passing through the lens through the second optical waveguide layer. Through the optical waveguide structure, no loss of the visible light wave band can be realized, the light utilization rate is improved, and the output light intensity is enhanced; in addition, the light can be divided into a plurality of tiny parts through the lens, and each part is refracted and focused to enable light spots to be overlapped, so that the light is homogenized.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, and particularly to an electronic paper display screen, a driving display circuit, and an air conditioner. Background Art

[0002] In the related art, in existing air conditioner products, there are mainly two types of display solutions, namely dot matrix screens based on conventional LEDs (Light-Emitting Diodes) or LCDs (Liquid Crystal Displays), and TFT screens based on LCDs. Among them, the dot matrix screen uses multiple pixel matrices to transmit signals, and generates different information such as text, images, and animations by controlling the color and brightness of the corresponding light-emitting diodes; the TFT-LCD (Thin-Film Transistor Liquid Crystal Display) screen is an active LCD display (active matrix drive), and generally integrates the source drive and the gate drive on a PCB substrate, and controls the display screen through the integrated drive IC. However, although the display effect of the TFT-LCD screen is better than that of the dot matrix screen, the transmissive LCD requires a backlight module, so more electric energy is consumed.

[0003] Then, in order to reduce energy consumption and save energy and reduce emissions, in existing air conditioner products, an electronic paper display screen is used for display. Electronic paper, also known as an electronic ink screen, can imitate the visual perception of printing and writing on paper, and is a new type of display technology with bistability, reflectivity, small size and beauty. Since the electronic paper display screen is a reflective display module, it does not require a backlight module, thus reducing energy consumption and saving energy and reducing emissions. However, compared with LCD display, the electronic paper display has a lower display brightness, which has certain limitations when used indoors. In addition, for electronic paper with brightness enhancement processing or conventional electronic paper with abnormal display, there will also be display Mura (non-uniformity) and other situations, such as brightness Mura and chromaticity Mura, which mainly refer to abnormal phenomena caused by uneven display screens. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides an electronic paper display screen, a driving display circuit, and an air conditioner, aiming to improve the light utilization rate of the electronic paper display screen and make the light of the display screen in the electronic paper display screen uniform.

[0005] In a first aspect, an embodiment of this application provides an electronic paper display screen, including:

[0006] A first substrate and a second substrate;

[0007] A liquid crystal layer is located between the first substrate and the second substrate, and electrodes are provided above and below the liquid crystal layer;

[0008] A grating is located between the liquid crystal layer and the second substrate;

[0009] An optical waveguide structure includes a first optical waveguide layer and a second optical waveguide layer. The first optical waveguide layer is located between the grating and the second substrate, and the second optical waveguide layer is located on the side of the liquid crystal layer and below the first substrate;

[0010] A lens is located between the second optical waveguide layer and the first substrate;

[0011] Wherein, the optical waveguide structure receives light passing through the first substrate, the liquid crystal layer and the grating through the first optical waveguide layer, and emits the light through the second optical waveguide layer and the lens towards the first substrate.

[0012] According to some embodiments of the present application, the lens includes a substrate and a crystal layer. The crystal layer is located above the substrate. The refractive index of the crystal layer is higher than a preset refractive index, and the surface of the crystal layer is arc-shaped.

[0013] According to some embodiments of the present application, the substrate is made of quartz, and the crystal layer is made of a silicon-based material.

[0014] According to some embodiments of the present application, the second optical waveguide layer is located around the liquid crystal layer and surrounds the liquid crystal layer, and the lens completely covers the second optical waveguide layer.

[0015] According to some embodiments of the present application, the electronic paper display screen further includes a diffusion layer, and the diffusion layer is located between the first substrate and the lens.

[0016] According to some embodiments of the present application, the diffusion layer includes diffusion particles, and the diffusion particles are made of polymethyl methacrylate.

[0017] According to some embodiments of the present application, the diffusion layer includes a grid, and the electronic paper display screen further includes a first light-shielding layer. The first light-shielding layer is located between the diffusion layer and the lens, and the grid and the first light-shielding layer overlap.

[0018] According to some embodiments of the present application, the electronic paper display screen further includes a first absorption layer and a second light-shielding layer. The first absorption layer is located between the first light-shielding layer and the liquid crystal layer, and the second light-shielding layer is located below the second substrate.

[0019] According to some embodiments of the present application, the electronic paper display screen further includes a second absorption layer, and the second absorption layer is located between the liquid crystal layer and the grating.

[0020] According to some embodiments of the present application, the electronic paper display screen further includes a frame adhesive, the frame adhesive is located on the sides of the liquid crystal layer, the grating and the optical waveguide structure, and the frame adhesive surrounds the liquid crystal layer, the grating and the optical waveguide structure.

[0021] According to some embodiments of the present application, the grating is made of titanium dioxide or hafnium dioxide, and the control period of the grating is within the sub-wavelength range.

[0022] According to some embodiments of the present application, the optical waveguide structure is made of a silicon nitride material.

[0023] In a second aspect, an embodiment of the present application further provides a driving display circuit, including a switching transistor assembly, an input end and a control end of the switching transistor assembly are used to be connected to a control chip, and an output end of the switching transistor assembly is used to be connected to the electronic paper display screen according to any one of the first aspect.

[0024] According to some embodiments of the present application, the switching transistor assembly includes a first switching transistor and a second switching transistor. An input end of the first switching transistor is used to receive a clock signal, an input end of the second switching transistor is used to receive a data signal, a control end of the first switching transistor is connected to a first-level transmission track, a control end of the second switching transistor is connected to a second-level transmission track, an output end of the first switching transistor is connected to the control end of the second switching transistor, and an output end of the second switching transistor is used to be connected to the electrode in the electronic paper display screen.

[0025] According to some embodiments of the present application, the driving display circuit further includes a first capacitor, a second capacitor and a third capacitor. The first capacitor is arranged between the first-level transmission track and the second-level transmission track, the second capacitor is arranged on the second-level transmission track, and the third capacitor is arranged between the second-level transmission track and the third-level transmission track.

[0026] According to some embodiments of the present application, the driving display circuit further includes a fourth capacitor, and the fourth capacitor is arranged between the output end of the second switching transistor and the electrode.

[0027] In a third aspect, an embodiment of the present application further provides an air conditioner, including the electronic paper display screen according to any one of the first aspect or the driving display circuit according to any one of the second aspect.

[0028] According to the technical solution of the embodiment of the present application, it has at least the following beneficial effects: The electronic paper display screen of the embodiment of the present application includes a first substrate and a second substrate; a liquid crystal layer is located between the first substrate and the second substrate, and electrodes are arranged above and below the liquid crystal layer; a grating is located between the liquid crystal layer and the second substrate; the optical waveguide structure includes a first optical waveguide layer and a second optical waveguide layer, the first optical waveguide layer is located between the grating and the second substrate, and the second optical waveguide layer is located on the side of the liquid crystal layer and below the first substrate; a lens is located between the second optical waveguide layer and the first substrate; the optical waveguide structure receives light passing through the first substrate, the liquid crystal layer and the grating through the first optical waveguide layer, and emits the light through the second optical waveguide layer and the lens towards the first substrate. The embodiment of the present application can achieve lossless in the visible light band through the optical waveguide structure, improve the light utilization rate, and further enhance the output light intensity; in addition, the embodiment of the present application can divide the light into multiple tiny parts through the lens, and each part is refracted and focused to overlap the light spots, so as to make the light uniform.

[0029] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0030] The drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

[0031] Figure 1 is a schematic structural diagram of an electronic paper display screen provided by an embodiment of the present application;

[0032] Figure 2 is a schematic optical path diagram of an electronic paper display screen provided by an embodiment of the present application;

[0033] Figure 3 is a schematic diagram of a microlens structure provided by an embodiment of the present application;

[0034] Figure 4 is a schematic diagram of a diffusion layer structure provided by an embodiment of the present application;

[0035] Figure 5 is a schematic circuit diagram of a driving display circuit of a single sub-pixel provided by an embodiment of the present application;

[0036] Figure 6 is a schematic diagram of a timing signal provided by an embodiment of the present application;

[0037] Figure 7 is a schematic diagram of the control logic of an electronic paper display screen provided by an embodiment of the present application. Detailed Embodiments

[0038] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application.

[0039] In the description of the present application, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0040] In the description of the present application, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0041] In the description of the present application, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0042] In some cases, in existing air conditioner products, there are mainly two types of display solutions, namely dot matrix screens based on conventional LEDs or LCDs, and TFT screens based on LCDs. Among them, the dot matrix screen uses multiple pixel matrices to transmit signals, and generates different information such as text, images, and animations by controlling the color and brightness of the corresponding light-emitting diodes; the TFT-LCD screen is an active LCD display, generally integrating the source driver and the gate driver on a PCB substrate, and controlling the display screen through the integrated driver IC. However, although the display effect of the TFT-LCD screen is better than that of the dot matrix screen, the transmissive LCD requires a backlight module, and therefore, it consumes more electric energy.

[0043] Then, in order to reduce energy consumption and achieve energy conservation and emission reduction, in existing air conditioner products, an electronic paper display screen is applied for display. Electronic paper, also known as an electronic ink screen, can mimic the visual perception of printing and writing on paper. It is a new type of display technology that is bistable, reflective, small and beautiful. Since the electronic paper display screen is a reflective display module, it does not require a backlight module, thus being able to reduce energy consumption and achieve energy conservation and emission reduction. However, compared with LCD display, the electronic paper display has a lower display brightness and has certain limitations when used indoors. In addition, for electronic paper with brightness enhancement processing or conventional electronic paper with abnormal display, there will also be display Mura, such as brightness Mura and chromaticity Mura, which mainly refer to abnormal phenomena caused by uneven display images.

[0044] Based on the above situation, the present application proposes an electronic paper display screen, a driving display circuit and an air conditioner, aiming to improve the light utilization rate of the electronic paper display screen and make the light of the display image in the electronic paper display screen uniform.

[0045] The following further elaborates on each embodiment of the electronic paper display screen of the present application in conjunction with the accompanying drawings.

[0046] As Figure 1 shown, Figure 1 is a schematic structural diagram of an electronic paper display screen provided by an embodiment of the present application.

[0047] In one embodiment, the electronic paper display screen includes but is not limited to a first substrate 100, a second substrate 200, a liquid crystal layer 300, a grating 400, an optical waveguide structure 500, a microlens 1200 and an electrode 600. Among them, a liquid crystal layer 300 is provided between the first substrate 100 and the second substrate 200, electrodes 600 are provided above and below the liquid crystal layer 300, a grating 400 is provided between the liquid crystal layer 300 and the second substrate 200. The optical waveguide structure 500 may include but is not limited to a first optical waveguide layer 510 and a second optical waveguide layer 520. The first optical waveguide layer 510 is provided between the grating 400 and the second substrate 200, the second optical waveguide layer 520 is provided on the side of the liquid crystal layer 300 and below the first substrate 100, and a microlens 1200 is provided between the second optical waveguide layer 520 and the first substrate 100.

[0048] It should be noted that as Figure 2As shown, the optical waveguide structure 500 can receive light from the first substrate 100, the liquid crystal layer 300, and the grating 400 through the first optical waveguide layer 510, and emit the light toward the first substrate 100 after passing through the microlens 1200 through the second optical waveguide layer 520. Therefore, the optical waveguide structure 500 can receive the light and emit it, so as to achieve loss-free visible light band, improve light utilization, and further enhance the output light intensity. In addition, the light is divided into multiple tiny parts through the microlens, each part is refracted and focused to make the light spots overlap, and the deflection angle of the light toward the central area of ​​the display screen becomes larger, which causes the light to be deflected toward the central area of ​​the display screen, thereby making the light in each area of ​​the display screen more uniform.

[0049] It can be understood that the first substrate 100 and the second substrate 200 are transparent rigid substrates, which may be glass plates or PMMA plates. The embodiment of the present application does not specifically limit the types of the first substrate 100 and the second substrate 200.

[0050] In addition, it can be understood that the above-mentioned liquid crystal layer 300 can be cholesterol liquid crystal molecules, and the embodiment of the present application does not specifically limit the type of the liquid crystal layer 300.

[0051] In addition, it can be understood that the cholesterol liquid crystal molecules have two stable states: focal conic arrangement state and planar arrangement state. When the cholesterol liquid crystal is in the planar arrangement state, it can reflect light of a specific wavelength; on the contrary, when the cholesterol liquid crystal is in the focal conic arrangement state, light will penetrate. Therefore, the cholesterol liquid crystal can be controlled to reflect or transmit light of a specific wavelength by applying a voltage to the cholesterol liquid crystal.

[0052] In addition, it is understood that cholesterol liquid crystal has a bistable property, which means that cholesterol liquid crystal can maintain the original arrangement state of liquid crystal molecules without external energy. When the liquid crystal layer 300 is cholesterol liquid crystal molecules, by adjusting the electrodes arranged above and below the liquid crystal layer 300, the distance of one circle of cholesterol liquid crystal rotation, i.e., the helical pitch, can be controlled. And by adjusting different voltages, the helical pitch of cholesterol liquid crystal can be adjusted, thereby changing the wavelength of light reflected by cholesterol liquid crystal, so that cholesterol liquid crystal can reflect light of a specific color, such as blue light, green light or red light, and can mix red light, green light and blue light, so as to output color images.

[0053] It should be noted that the electrode 600 is used to apply voltages above and below the liquid crystal layer 300, so that the liquid crystal molecules in the liquid crystal layer 300 are deflected, and thus are in different alignment states. By adjusting the different voltages output by the electrode 600, the pitch of the liquid crystal molecules can be adjusted, thereby changing the wavelength of the light reflected by the liquid crystal molecules, and enabling the liquid crystal molecules to reflect only light of a specific color, such as blue light (wavelength: 415 nm - 500 nm), green light (wavelength: 500 nm - 590 nm), or red light (wavelength: 590 nm - 740 nm). After mixing the three primary colors of light, a color image can be output.

[0054] It is worth noting that since the electronic paper display screen according to the embodiment of the present application can achieve lossless in the visible light band through the optical waveguide structure 500, improve the light utilization rate, and further enhance the output light intensity; in addition, the present application can divide the light into multiple tiny parts through the microlens 1200, and each part is refracted and focused so that the light spots overlap, and the deflection angle of the light towards the central area of the display screen becomes larger, prompting the light to deflect towards the central area of the display screen, so that the light in each area of the display screen is more uniform; in addition, the electronic paper display screen according to the embodiment of the present application has no backlight module, so the energy consumption can be reduced when the air conditioner is running normally.

[0055] In addition, it is worth noting that the present application introduces a new display mode, which meets the requirements of energy conservation, environmental protection, visual novelty, etc., can integrate product art with the space scene, highlight the unique beauty of the product, and provide users with emotional value of beauty; moreover, the electronic paper display screen of the present application can solve the Mura problem of the electronic paper display screen through the microlens, making it possible to apply indoor household appliances such as air conditioners.

[0056] It should be noted that as Figure 3 shown, regarding the above-mentioned microlens 1200, it includes but is not limited to a substrate and a crystal layer. Among them, the crystal layer is arranged above the substrate, the refractive index of the crystal layer is higher than the preset refractive index, and the surface of the crystal layer is arc-shaped.

[0057] It can be understood that regarding the above-mentioned preset refractive index, it can be preset and is a fixed value. Usually, in the embodiment of the present application, a crystal layer with a high refractive index can be selected, and the embodiment of the present application does not make a specific limitation on the size of the preset refractive index.

[0058] In addition, it should be noted that the substrate of the microlens 1200 can select some semiconductor substrate materials, such as quartz substrate, sapphire substrate, silicon substrate, etc. The embodiment of the present application does not make a specific limitation on the material type of the substrate of the microlens 1200.

[0059] In addition, it should be noted that the crystal layer of the microlens 1200 can be made of some dielectric materials with high refractive indices, such as titanium dioxide, gallium nitride, silicon nitride, hafnium oxide, silicon, etc. The embodiments of the present application do not specifically limit the material type of the crystal layer of the microlens 1200.

[0060] In one embodiment, the substrate can be made of quartz, and the crystal layer can be made of a silicon-based material.

[0061] It should be noted that the second optical waveguide layer 520 is disposed around the liquid crystal layer 300 and surrounds the liquid crystal layer 300, while the microlens 1200 is disposed above the second optical waveguide layer 520 and completely covers the second optical waveguide layer 520.

[0062] It can be understood that the second optical waveguide layer 520 is disposed around the liquid crystal layer 300, which can better achieve lossless in the visible light band, better improve the light utilization rate, and further enhance the output light intensity; while the microlens 1200 is disposed above the second optical waveguide layer 520 and completely covers the second optical waveguide layer 520, in order to better divide the light emitted from the second optical waveguide layer 520 into multiple tiny parts, and each part is refracted and focused to overlap the light spots, so as to better homogenize the light.

[0063] In addition, it should be noted that the electronic paper display screen further includes a diffusion layer 1300, wherein the diffusion layer 1300 is disposed between the first substrate 100 and the microlens 1200.

[0064] It should be noted that the diffusion layer 1300 is used to improve the scattering ability of light, so that the light is more uniform in the display interface, and further the display brightness is more uniform.

[0065] It should be noted that as Figure 4 shown, the diffusion layer 1300 includes but is not limited to diffusion particles 1310, wherein the diffusion particles 1310 are disposed between the first substrate 100 and the microlens 1200.

[0066] It can be understood that for the above-mentioned diffusion particles 1310, PMMA (polymethyl methacrylate) microspheres with different particle sizes are used, that is, polymethyl methacrylate microspheres. Among them, the light transmittance and haze are related to the surface smoothness and regularity of the diffusion particles 1310. When the surface smoothness and regularity of the diffusion particles 1310 are better, the transmittance and haze are better, which is more conducive to the refraction and diffusion of light, so that the light is more uniform in the display interface, and further the display brightness is more uniform. The embodiments of the present application do not specifically limit the surface smoothness and regularity of the diffusion particles 1310.

[0067] It should be noted that, as Figure 4 shown, the diffusion layer 1300 further includes, but is not limited to, a grid 1320, and the electronic paper display further includes a first light-shielding layer 800. Among them, the first light-shielding layer 800 is disposed between the diffusion layer 1300 and the microlens 1200, and there is an overlap between the grid 1320 and the first light-shielding layer 800.

[0068] It can be understood that the first light-shielding layer 800 can be metal, graphite, black photoresist material, or ink. The embodiments of the present application do not specifically limit the type of the first light-shielding layer 800.

[0069] It should be noted that the first light-shielding layer 800 can reduce the reflection of external light on the screen surface, thereby helping to reduce light interference and improve the readability of the display screen; secondly, the first light-shielding layer 800 can reduce light reflection, which helps to improve the contrast of text or images on the display screen, making the content on the display screen easier to read and identify; furthermore, the first light-shielding layer 800 can also block light from the surrounding environment, such as sunlight or strong indoor lighting, thereby helping to maintain the readability of the screen under various lighting conditions; again, the first light-shielding layer 800 can reduce reflection and block ambient light, thereby helping to improve the screen visibility at different viewing angles, enabling users to view the display content from a wider angle.

[0070] It should be noted that since the grid 1320 in the diffusion layer 1300 and the first light-shielding layer 800 are structurally overlapped, therefore, the grid 1320 part in the diffusion layer 1300 can be blocked by the first light-shielding layer 800 for light, and light homogenization is not required. Thus, the area of the diffusion layer 1300 that needs light homogenization is reduced, and further, the number of diffusion particles 1310 in the diffusion layer 1300 can be reduced, reducing the production cost of the diffusion layer 1300.

[0071] As Figure 4 shown, Figure 4 is a schematic diagram of the diffusion layer structure provided by an embodiment of the present application.

[0072] In an embodiment, the diffusion layer 1300 includes, but is not limited to, diffusion particles 1310 and a grid 1320.

[0073] It should be noted that the diffusion layer 1300 is based on a polyester film and is jointly composed of a grid 1320 and diffusion particles 1310. Among them, the number of the grid 1320 and the diffusion particles 1310 is multiple, and each grid 1320 partially overlaps with the first light-shielding layer 800 one by one. Therefore, the grid 1320 will not be penetrated by light due to the light-blocking effect of the first light-shielding layer 800 and does not require light homogenization. As a result, the area of the diffusion layer 1300 that needs light homogenization is reduced, and further, the number of diffusion particles 1310 in the diffusion layer 1300 can be reduced, thereby reducing the production cost of the diffusion layer 1300. In addition, the diffusion particles 1310 are PMMA microspheres with different particle sizes, that is, polymethyl methacrylate microspheres. Among them, the light transmittance and haze are related to the surface smoothness and regularity of the diffusion particles 1310. When the surface smoothness and regularity of the diffusion particles 1310 are better, the transmittance and haze are better, which is more conducive to the refraction and diffusion of light, so that the light is more uniform in the display interface, and further the display brightness is more uniform. The present application does not specifically limit the surface smoothness and regularity of the diffusion particles 1310.

[0074] It is worth noting that the diffusion layer 1300 can improve the light scattering ability, so that the light intensity can be more uniform in the display interface, and further the display brightness is more uniform.

[0075] As Figure 1 shown, the electronic paper display screen further includes a first absorption layer 700 and a second light-shielding layer 900. Among them, the first absorption layer 700 is disposed between the first light-shielding layer 800 and the liquid crystal layer 300, and the second light-shielding layer 900 is disposed below the second substrate 200.

[0076] It should be noted that the first absorption layer 700 is used to absorb light outside the reflection wavelength range, so as to improve the color saturation and image quality of pixel display. Secondly, the first absorption layer 700 adjusts the color performance by absorbing or weakening the light outside the reflection range. By adjusting the characteristics of the absorption layer, different colors can be presented on the electronic paper display screen. Thirdly, the first absorption layer 700 can make the content displayed on the electronic paper display screen clearer and enhance the contrast between the background and the foreground by absorbing or weakening the light outside the reflection range. Fourthly, the first absorption layer 700 can help reduce glare from ambient light, thereby improving readability under different lighting conditions. In addition, by adjusting the optical properties of the first absorption layer 700, the light transmittance can be controlled, so as to maintain the visibility of the screen under different lighting conditions.

[0077] It can be understood that the second light-shielding layer 900 can be metal, graphite, black photoresist material, or ink. The embodiments of the present application do not specifically limit the type of the second light-shielding layer 900.

[0078] It should be noted that the second light-shielding layer 900 can reduce the reflection of external light on the screen surface, thereby helping to reduce light interference and improve the readability of the display screen; secondly, the second light-shielding layer 900 can reduce light reflection, which helps to improve the contrast of text or images on the display screen, making the content on the display screen easier to read and recognize; furthermore, the second light-shielding layer 900 can also block light from the surrounding environment, such as sunlight or strong indoor lighting, thereby helping to maintain the readability of the screen under various lighting conditions; again, the second light-shielding layer 900 can reduce reflection and block ambient light, thereby helping to improve the screen visibility at different viewing angles, enabling users to view the display content from a wider angle.

[0079] In addition, it should be noted that the e-paper display screen further includes a second absorption layer 1000, where the second absorption layer 1000 is disposed between the liquid crystal layer 300 and the grating 400.

[0080] It should be noted that the second absorption layer 1000 is used to absorb light outside the reflection wavelength range again, preventing light outside the reflection wavelength range from entering the optical waveguide structure 500 and thus affecting the image quality.

[0081] It can be understood that the above-mentioned first absorption layer 700 and second absorption layer 1000 can be photoresist materials or inks. The embodiments of the present application do not specifically limit the first absorption layer 700 and the second absorption layer 1000.

[0082] In addition, it should be noted that the e-paper display screen further includes a frame adhesive 1100, where the frame adhesive 1100 is disposed on the sides of the liquid crystal layer 300, the grating 400, and the optical waveguide structure 500, and the liquid crystal layer 300, the grating 400, and the optical waveguide structure 500 are surrounded by the frame adhesive 1100.

[0083] It can be understood that the frame adhesive 1100 is used to prevent liquid crystal molecules in the liquid crystal layer 300 from leaking out.

[0084] In addition, it can be understood that the above-mentioned grating 400 can be made of titanium dioxide, hafnium dioxide, or a high refractive index dielectric material. The embodiments of the present application do not specifically limit the manufacturing components of the grating 400.

[0085] It should be noted that the control period of the grating 400 is within the sub-wavelength range, so as to ensure high coupling efficiency. Therefore, only the zero-order diffracted light can be coupled into the optical waveguide structure 500, where the duty cycle is 0.5.

[0086] It can be understood that different grating periods T can reflect different colors of light. When T = 275 ± 5 nm, blue light band (narrowband spectrum, peak value is about 480 nm) is reflected. When T is 325 ± 5 nm, green light band (narrowband spectrum, peak value is about 550 nm) is reflected. When T is 375 ± 5 nm, red light band (narrowband spectrum, peak value is about 640 nm) is reflected. In order to improve the diffraction efficiency and ensure that more light is coupled into the optical waveguide layer, it is necessary to maintain the narrowband output of the peak band as much as possible, that is, it is necessary to precisely control the grating period T.

[0087] It should be noted that the thickness of the optical waveguide structure 500 and the grating 400 is about 100 - 500 nm.

[0088] In addition, it should be noted that the optical waveguide structure 500 is made of silicon nitride material. Among them, silicon nitride has a high refractive index and low light attenuation. Therefore, through the optical waveguide structure 500, lossless in the visible light band can be achieved, the light utilization rate can be improved, and the output light intensity can be enhanced.

[0089] As Figure 3 shown, Figure 3 is a schematic diagram of a microlens structure provided by an embodiment of the present application.

[0090] In one embodiment, the position of the microlens 1200 is set at the bottom of the first absorption layer 700, and completely covers the optical waveguide structure 500, and is distributed around the edge of a single sub-pixel. The microlens 1200 structure includes a substrate and a crystal layer. Among them, the crystal layer is located above the substrate, and the refractive index of the crystal layer is higher than the preset refractive index, and the surface of the crystal layer is arc-shaped.

[0091] It should be noted that the substrate is made of quartz material, and the crystal layer is made of silicon-based material.

[0092] It can be understood that the above preset refractive index can be preset and is a fixed value. The embodiments of the present application do not specifically limit the size of the preset refractive index.

[0093] It can be understood that the micro-lens 1200 structure is formed by depositing a curved high-refractive-index crystal layer, such as a silicon-based material (n = 3.4), on a substrate made of quartz material. The thickness of the substrate is about 1 - 10 um, and the height range of the convex structure is 0.5 - 3 um. The micro-lens 1200 structures are closely arranged along the optical waveguide structure 500, dividing a complete light wave into multiple tiny parts in space. Each part is refracted and focused to overlap the light spots, and the deflection angle of the light towards the central area of the display screen becomes larger, prompting the light to deflect towards the central area of the display screen, thereby making the light in each area of the display screen more uniform.

[0094] It should be noted that the micro-lens 1200 is disposed above the second optical waveguide layer 520 in the optical waveguide structure 500 and completely covers the second optical waveguide layer 520, which can better divide the light emitted from the second optical waveguide layer 520 into multiple tiny parts. Each part is refracted and focused to overlap the light spots, and the deflection angle of the light towards the central area of the display screen becomes larger, prompting the light to deflect towards the central area of the display screen, thereby being able to better uniformize the light.

[0095] It can be understood that a single sub-pixel usually refers to the smallest display unit on a display screen, which contains the brightness information of the three primary colors: red, green, and blue. Such sub-pixels are used to create the overall pixel color. In liquid crystal display technology, each pixel is usually composed of three single sub-pixels, corresponding to red, green, and blue respectively. These three colors are mixed by controlling the brightness of each sub-pixel to form the desired color. For example, if yellow needs to be displayed, the red and green sub-pixels will be activated, while the blue sub-pixel will be turned off. By precisely controlling the brightness of each sub-pixel, various colors and images can be created. This arrangement and control method of sub-pixels enable the display to produce high-resolution and true-color images.

[0096] As Figure 2 shown, Figure 2 is a schematic diagram of the optical path of an electronic paper display screen provided by an embodiment of the present application.

[0097] In one embodiment, the incident light is ambient light. Taking white light as an example, first, after the white light passes through the first absorption layer 700 from the first substrate 100, since the first absorption layer 700 is used to absorb light outside the reflection wavelength range, a certain specific wavelength range of light is left, such as red light, green light or blue light. Then, by adjusting the voltage across the electrodes 600, a part of the specific light is reflected towards the first substrate 100 after passing through the liquid crystal layer 300, and the remaining light penetrates the liquid crystal layer 300. Then, a small part of the light penetrates the liquid crystal layer 300 and passes through the second absorption layer 1000. Since the second absorption layer 1000 is used to absorb light outside the reflection wavelength range again, stray light outside the reflection wavelength range can be filtered out. Finally, the light enters the grating 400 and the first optical waveguide layer 510, and the second optical waveguide layer 520 emits the light towards the first substrate 100 after passing through the microlens 1200. Among them, after passing through the microlens 1200, the light will first pass through the diffusion layer 1300 and then be emitted from the first substrate 100.

[0098] It should be noted that when the light exits from the second optical waveguide layer 520 in the optical waveguide structure 500, the microlens 1200 will further deflect the light. The large-angle deflection makes the light uniform in the display central area. Then, the light passes through the diffusion layer 1300, and the light will collide with the diffusion particles 1310 in the diffusion layer, so that the light is evenly scattered in all directions.

[0099] It should be noted that the first absorption layer 700 is used to absorb light outside the reflection wavelength range, so as to improve the color saturation of pixel display and the image quality. Secondly, the first absorption layer 700 adjusts the color performance by absorbing or weakening the light outside the reflection range. By adjusting the characteristics of the absorption layer, different colors can be presented on the electronic paper display. Furthermore, the first absorption layer 700 can make the content displayed on the electronic paper display clearer and enhance the contrast between the background and the foreground by absorbing or weakening the light outside the reflection range. Moreover, the first absorption layer 700 can help reduce glare from ambient light, thereby improving readability under different lighting conditions. In addition, by adjusting the optical properties of the first absorption layer 700, the light transmittance can be controlled, so that the visibility of the screen can be maintained under different lighting conditions.

[0100] It should be noted that the second absorption layer 1000 is used to absorb light outside the reflection wavelength range again, so that light outside the reflection wavelength range can be prevented from entering the optical waveguide structure 500, thereby affecting the image quality.

[0101] It should be noted that the optical waveguide structure 500 can receive light from the first substrate 100, the liquid crystal layer 300, and the grating 400 through the first optical waveguide layer 510, and emit the light toward the first substrate 100 after passing through the microlens 1200 and the diffusion layer 1300 through the second optical waveguide layer 520. Therefore, the optical waveguide structure 500 can receive the light and emit it, so as to achieve lossless visible light band, improve light utilization, and further enhance the output light intensity; in addition, the light is divided into a plurality of tiny parts through the microlens 1200, each part is refracted and focused to make the light spots overlap, and the deflection angle of the light toward the central area of ​​the display screen becomes larger, so that the light is deflected toward the central area of ​​the display screen, thereby making the light uniform toward the central area of ​​the display screen; in addition, through the diffusion layer 1300, the light will collide with the diffusion particles 1310 in the diffusion layer 1300, so that the light is evenly scattered around.

[0102] It should be noted that voltage is applied to the upper and lower parts of the liquid crystal layer 300 through the electrode 600, so that the liquid crystal molecules in the liquid crystal layer 300 are deflected and thus in different arrangement states. When the liquid crystal layer 300 is cholesterol liquid crystal molecules, the distance of one circle of cholesterol liquid crystal rotation, i.e., the helical pitch, can be controlled by adjusting the electrodes arranged above and below the liquid crystal layer 300. And the helical pitch of cholesterol liquid crystal can be adjusted by adjusting the output of different voltages by the electrode 600, thereby changing the wavelength of light reflected by the cholesterol liquid crystal, so that the cholesterol liquid crystal only reflects light of a specific color, such as blue light (wavelength: 415nm~500nm), green light (wavelength: 500nm~590nm) or red light (wavelength: 590nm~740nm), and a color image can be output after mixing the three primary colors.

[0103] In addition, it can be understood that the cholesterol liquid crystal molecules have two stable states: focal conic arrangement state and planar arrangement state. When the cholesterol liquid crystal is in the planar arrangement state, it can reflect light of a specific wavelength; on the contrary, when the cholesterol liquid crystal is in the focal conic arrangement state, light will penetrate. Therefore, the cholesterol liquid crystal can be controlled to reflect or transmit light of a specific wavelength by applying a voltage to the cholesterol liquid crystal.

[0104] It is worth noting that the present application introduces a new display mode to meet the needs of energy conservation, environmental protection, and visual novelty. It can integrate product art with spatial scenes, highlight the unique beauty of the product, and provide users with beautiful emotional value. Moreover, the electronic paper display of the present application can solve the Mura problem of the electronic paper display through microlenses, making it possible to apply indoor home appliances such as air conditioners.

[0105] Based on the electronic paper display screens of the above-mentioned various embodiments, various embodiments of the driving display circuit of the present application are proposed below.

[0106] likeFigure 5 As shown Figure 5 is a circuit schematic diagram of a driving display circuit for a single sub-pixel provided by an embodiment of the present application.

[0107] In one embodiment, the driving display circuit includes, but is not limited to, a switching transistor component. Among them, the input end and the control end of the switching transistor component are used to connect to a control chip, and the output end of the switching transistor component is used to connect to the electronic paper display screen of any one of the above embodiments.

[0108] It should be noted that since the driving display circuit of the embodiment of the present application is used to drive the electronic paper display screen of any one of the above embodiments, therefore, the specific implementation manner and technical effect of the driving display circuit of the embodiment of the present application can refer to the specific implementation manner and technical effect of the electronic paper display screen of any one of the above embodiments.

[0109] It should be noted that the switching transistor component includes a first switching transistor T1 and a second switching transistor T2. Among them, the input end of the first switching transistor T1 is used to receive a clock signal, the input end of the second switching transistor T2 is used to receive a data signal, the control end of the first switching transistor T1 is connected to the first-stage transmission track GN-1, the control end of the second switching transistor T2 is connected to the second-stage transmission track GN, the output end of the first switching transistor T1 is connected to the control end of the second switching transistor T2, and the output end of the second switching transistor T2 is used to connect to an electrode in the electronic paper display screen.

[0110] It should be noted that VCOM is the common electrode voltage, which is connected to the electrode in the electronic paper display screen through the output end of the second switching transistor T2, so that a voltage difference is formed across the electrode to adjust the deflection of the liquid crystal molecules in the liquid crystal, so as to be in different alignment states, and further change the wavelength of the light reflected by the liquid crystal.

[0111] It should be noted that the source electrode of the first switching transistor T1 is used to receive the input of the clock signal, such as the CKN signal; the source electrode of the second switching transistor T2 is used to receive the input of the Date signal, such as the VDATA signal.

[0112] It can be understood that the first switching transistor T1 and the second switching transistor T2 are TFTs (Thin-Film Transistors). The TFT thin-film transistor is a thin-film semiconductor device, which is manufactured by depositing a thin film on a thin film. Among them, the thin film is usually made of amorphous silicon or polysilicon; when a voltage is applied to the thin-film transistor, its conductivity will change, thereby affecting the transmittance of the liquid crystal; by controlling the voltage of the thin-film transistor, the brightness and color of each pixel can be precisely controlled.

[0113] It can be understood that the source electrodes of the first switching transistor T1 and the second switching transistor T2 are the input ends, the gate electrodes are the control ends, and the drain electrodes are the output ends.

[0114] It should be noted that the first switching transistor T1 and the second switching transistor T2 are disposed in the second substrate 200. The number of the first switching transistor T1 and the second switching transistor T2 is multiple and is related to the number of single sub-pixels. The embodiments of the present application do not specifically limit the number of the first switching transistor T1 and the second switching transistor T2.

[0115] It should be noted that the first switching transistor T1 and the second switching transistor T2 control their switches through their respective gates. When there is an input voltage at the gate of the first switching transistor T1, the first switching transistor T1 is turned on, and a voltage is generated at the VGATE terminal. When there is an input voltage at the gate of the second switching transistor T2, the second switching transistor T2 is turned on.

[0116] In addition, it should be noted that the driving display circuit further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3. The first capacitor C1 is disposed between the first-stage transmission track GN-1 and the second-stage transmission track GN. The second capacitor C2 is disposed on the second-stage transmission track GN. The third capacitor C3 is disposed between the second-stage transmission track GN and the third-stage transmission track GN+1.

[0117] It can be understood that the above-mentioned first capacitor C1, second capacitor C2, and third capacitor C3 refer to capacitors that can charge and discharge. Capacitors are mainly divided into aluminum electrolytic capacitors, ceramic capacitors, mica capacitors, etc. Among them, the aluminum electrolytic capacitor is characterized by a large capacitance and positive and negative polarities, and is suitable for power supply filtering or low-frequency circuits. The ceramic capacitor is characterized by a small volume, good heat resistance, small loss, and high insulation resistance, but has a small capacitance and is suitable for high-frequency circuits. The mica capacitor is characterized by a small dielectric loss, a large insulation resistance, and a small temperature coefficient, and is suitable for high-frequency circuits. The types of the above-mentioned first capacitor C1, second capacitor C2, and third capacitor C3 can be selected according to actual situations and are not specifically limited herein.

[0118] In addition, it should be noted that the driving display circuit further includes a fourth capacitor CST. The fourth capacitor CST is disposed between the output terminal of the second switching transistor T2 and the electrode.

[0119] It can be understood that the above-mentioned fourth capacitor CST refers to a capacitor that can charge and discharge. Capacitors are mainly divided into aluminum electrolytic capacitors, ceramic capacitors, mica capacitors, etc. Among them, the aluminum electrolytic capacitor is characterized by a large capacitance and positive and negative polarities, and is suitable for power supply filtering or low-frequency circuits. The ceramic capacitor is characterized by a small volume, good heat resistance, small loss, and high insulation resistance, but has a small capacitance and is suitable for high-frequency circuits. The mica capacitor is characterized by a small dielectric loss, a large insulation resistance, and a small temperature coefficient, and is suitable for high-frequency circuits. The type of the above-mentioned fourth capacitor CST can be selected according to actual situations and is not specifically limited herein.

[0120] It should be noted that since the fourth capacitor CST can be charged and discharged, when the voltage of the liquid crystal layer is insufficient, the voltage can be supplied to the liquid crystal layer through the fourth capacitor CST, playing a voltage stabilizing role, so that a part of the specific light is reflected by the liquid crystal layer and emitted towards the first substrate, and the rest of the light penetrates the liquid crystal layer.

[0121] It should be noted that the voltage can be boosted through the first capacitor C1, the second capacitor C2, and the third capacitor C3, so that the gate voltages of the first switching transistor T1 and the second switching transistor T2 are boosted, which is beneficial to the more sufficient turn-on of the first switching transistor T1 and the second switching transistor T2. Thus, the voltage difference across the fourth capacitor CST can be increased, and further the driving ability of the second switching transistor T2 can be improved. Therefore, the display brightness of the electronic paper display can be made more uniform.

[0122] It can be understood that the above-mentioned boosting voltage refers to the process of increasing the voltage through a circuit.

[0123] Exemplarily, when the voltage of the second-stage transfer track GN is 30V and the voltage of the third-stage transfer track GN+1 is 0V, the driving display circuit includes, but is not limited to, charging the third capacitor C3. The voltage of the third-stage transfer track GN+1 changes from 0V to 30V, and the voltage of the second-stage transfer track GN changes from 30V to 0V. The voltage of the gate of the second switching transistor T2 is equivalent to the voltage of the third-stage transfer track GN+1 plus the voltage of the third capacitor C3, that is, 30V plus the voltage of the third capacitor C3. At this time, the second switching transistor T2 is turned on, and the fourth switching transistor CST starts to charge. Therefore, due to the third capacitor C3, the voltage of the gate of the second switching transistor T2 is equivalent to the voltage of the third-stage transfer track GN+1 plus the voltage of the third capacitor C3, and the voltage of the gate of the second switching transistor T2 increases, which is beneficial to the more sufficient turn-on of the second switching transistor T2. Thus, the voltage difference across the fourth capacitor CST can be increased, and the driving ability of the second switching transistor T2 can be improved. Therefore, the display brightness of the electronic paper display can be made more uniform; in addition, since the fourth capacitor CST can be charged and discharged, when the voltage of the liquid crystal layer is insufficient, the voltage is supplied to the liquid crystal layer through the fourth capacitor CST, playing a voltage stabilizing role, so that a part of the specific light is reflected by the liquid crystal layer and emitted towards the first substrate 100, and the rest of the light penetrates the liquid crystal layer.

[0124] As Figure 6 shown, Figure 6 is a schematic diagram of a timing signal provided by an embodiment of the present application.

[0125] In one embodiment, when the first-stage transmission track GN-1 is at a high-level signal and the second-stage transmission track GN is at a low-level signal, the first capacitor C1 and the second capacitor C2 are charged. At this time, the first switching transistor T1 is turned on, and a voltage is generated at the VGATE terminal. Then, the clock signal is input from the source of the first switching transistor T1. At this time, the first-stage transmission track GN-1 is at a low-level signal, while the second-stage transmission track GN is at a high-level signal. Then, the third capacitor C3 is charged, the second switching transistor T2 is turned on, and the fourth capacitor CST is charged. At this time, the second-stage transmission track GN is at a low-level signal, while the third-stage transmission track GN+1 is at a high-level signal.

[0126] It should be noted that the high-level signal input by the clock signal CKN is the VGH signal, and the low-level signal input is the VGL signal. Through the stage-by-stage transmission mode of the first-stage transmission track GN-1, the second-stage transmission track GN, and the third-stage transmission track GN+1, the gate voltage is increased step by step. After the gate voltage is boosted, the output voltage of the high-level signal of the second-stage transmission track GN is close to twice the high-level signal input by the clock signal CKN, so as to ensure that the second switching transistor T2 is fully turned on, improve the response speed of the second switching transistor T2, and improve the driving and display ability of the electronic paper display screen.

[0127] It should be noted that the third capacitor C3 can be used to boost the voltage, so that the gate voltage of the second switching transistor T2 is boosted, which is beneficial to the second switching transistor T2 to turn on more fully, thereby increasing the voltage difference across the fourth capacitor CST, and further improving the driving ability of the second switching transistor T2. Therefore, the display brightness of the electronic paper display screen can be made more uniform.

[0128] It should be noted that since the fourth capacitor CST can be charged and discharged, when the voltage of the liquid crystal layer is insufficient, the voltage is supplied to the liquid crystal layer through the fourth capacitor CST to play a voltage stabilizing role, so that a part of the specific light is reflected by the liquid crystal layer and emitted towards the first substrate 100, and the remaining light penetrates the liquid crystal layer.

[0129] It should be noted that the first-stage transmission track GN-1, the second-stage transmission track GN, and the third-stage transmission track GN+1 have the function of a shift register, can copy the clock signal CKN, and thus control the driving circuit switch.

[0130] It should be noted that the first capacitor C1, the second capacitor C2, and the third capacitor C3 can be used to boost the voltage, so that the gate voltages of the first switching transistor T1 and the second switching transistor T2 are boosted, which is beneficial to the first switching transistor T1 and the second switching transistor T2 to turn on more fully, thereby increasing the voltage difference across the fourth capacitor CST, and further improving the driving ability of the second switching transistor T2. Therefore, the display brightness of the electronic paper display screen can be made more uniform.

[0131] As Figure 7 shown Figure 7 is a schematic diagram of the control logic of an electronic paper display screen provided by an embodiment of the present application.

[0132] In one embodiment, the chip MCU is used to control the clock signal CNK to be input through the source electrode of the first switching tube T1. Additionally, through the level transfer mode of the first-level transfer track GN-1, the second-level transfer track GN, and the third-level transfer track GN+1, the gate voltage is gradually increased. After the gate voltage is boosted, the output voltage of the high-level signal of the second-level transfer track GN is close to twice the high-level signal input by the clock signal CKN, so as to ensure that the second switching tube T2 is fully turned on, improve the response speed of the second switching tube T2, and enhance the driving and display capabilities of the electronic paper display screen; in addition, by combining the control logic with the electronic paper display screen, the program for equalizing the display brightness of the display screen is fed back to the chip MCU for optimization, and finally the effect of uniform display brightness is presented.

[0133] It can be understood that the MCU (Microcontroller Unit) is an integrated circuit in an embedded system, which usually includes a processor core, a memory, input / output interfaces, and various peripherals. The microcontroller is mainly designed to control electronic devices and execute specific tasks or functions.

[0134] It should be noted that the present application can achieve the uniformity of the display screen by matching the structure of the driving display circuit with the electronic paper display screen and combining the control method of the chip.

[0135] Based on the electronic paper display screen of the above various embodiments and the driving display circuit of the above various embodiments, the following presents various embodiments of the air conditioner of the present application.

[0136] In one embodiment, the air conditioner includes the electronic paper display screen of any one of the above embodiments or the driving display circuit of any one of the above embodiments.

[0137] It should be noted that since the air conditioner of the embodiment of the present application includes the electronic paper display screen or the driving display circuit of any one of the above embodiments, therefore, for the specific implementation manners and technical effects of the air conditioner of the embodiment of the present application, reference can be made to the specific implementation manners and technical effects of the electronic paper display screen or the driving display circuit of any one of the above embodiments.

[0138] The above has made a specific description of the preferred embodiments of the present application, but the present application is not limited to the above implementation manners. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. An electronic paper display screen, characterized in that, comprising: a first substrate and a second substrate; a liquid crystal layer located between the first substrate and the second substrate, with electrodes provided above and below the liquid crystal layer; a grating located between the liquid crystal layer and the second substrate; an optical waveguide structure including a first optical waveguide layer and a second optical waveguide layer, the first optical waveguide layer being located between the grating and the second substrate, and the second optical waveguide layer being located on the side of the liquid crystal layer and below the first substrate; a lens located between the second optical waveguide layer and the first substrate; wherein, the optical waveguide structure receives light passing through the first substrate, the liquid crystal layer and the grating through the first optical waveguide layer, and emits the light through the second optical waveguide layer and the lens towards the first substrate.

2. The electronic paper display screen according to claim 1, characterized in that, the lens includes a substrate and a crystal layer, the crystal layer being located above the substrate, the refractive index of the crystal layer being higher than a preset refractive index, and the surface of the crystal layer being arc-shaped.

3. The electronic paper display screen according to claim 2, characterized in that, the substrate is made of quartz, and the crystal layer is made of a silicon-based material.

4. The electronic paper display screen according to claim 1, characterized in that, the second optical waveguide layer is located around the liquid crystal layer and surrounds the liquid crystal layer, and the lens completely covers above the second optical waveguide layer.

5. The electronic paper display screen according to claim 1, characterized in that, the electronic paper display screen further includes a diffusion layer, and the diffusion layer is located between the first substrate and the lens.

6. The electronic paper display screen according to claim 5, characterized in that, the diffusion layer includes diffusion particles, and the diffusion particles are made of polymethyl methacrylate.

7. The electronic paper display screen according to claim 5, characterized in that, the diffusion layer includes a grid, the electronic paper display screen further includes a first light-shielding layer, the first light-shielding layer is located between the diffusion layer and the lens, and the grid and the first light-shielding layer overlap.

8. The electronic paper display screen according to claim 7, characterized in that, the electronic paper display screen further includes a first absorption layer and a second light-shielding layer, the first absorption layer is located between the first light-shielding layer and the liquid crystal layer, and the second light-shielding layer is located below the second substrate.

9. The electronic paper display screen according to claim 1, characterized in that, the electronic paper display screen further includes a second absorption layer, and the second absorption layer is located between the liquid crystal layer and the grating.

10. The electronic paper display screen according to claim 1, characterized in that, the electronic paper display screen further includes a frame adhesive, the frame adhesive is located on the side of the liquid crystal layer, the grating and the optical waveguide structure, and the frame adhesive surrounds the liquid crystal layer, the grating and the optical waveguide structure.

11. The electronic paper display screen according to any one of claims 1 to 10, characterized in that, The grating is made of titanium dioxide or hafnium dioxide, and the control period of the grating is within the sub-wavelength range.

12. The electronic paper display screen according to any one of claims 1 to 10, characterized in that the optical waveguide structure is made of silicon nitride material.

13. A driving display circuit, characterized in that it includes a switching transistor assembly. The input end and the control end of the switching transistor assembly are used to be connected to a control chip, and the output end of the switching transistor assembly is used to be connected to the electronic paper display screen according to any one of claims 1 to 12.

14. The driving display circuit according to claim 13, characterized in that the switching transistor assembly includes a first switching transistor and a second switching transistor. The input end of the first switching transistor is used to receive a clock signal, the input end of the second switching transistor is used to receive a data signal, the control end of the first switching transistor is connected to a first-stage transmission track, the control end of the second switching transistor is connected to a second-stage transmission track, the output end of the first switching transistor is connected to the control end of the second switching transistor, and the output end of the second switching transistor is used to be connected to the electrode in the electronic paper display screen.

15. The driving display circuit according to claim 14, characterized in that the driving display circuit further includes a first capacitor, a second capacitor and a third capacitor. The first capacitor is arranged between the first-stage transmission track and the second-stage transmission track, the second capacitor is arranged on the second-stage transmission track, and the third capacitor is arranged between the second-stage transmission track and the third-stage transmission track.

16. The driving display circuit according to claim 14, characterized in that the driving display circuit further includes a fourth capacitor, and the fourth capacitor is arranged between the output end of the second switching transistor and the electrode.

17. An air conditioner, characterized in that it includes the electronic paper display screen according to any one of claims 1 to 12 or the driving display circuit according to any one of claims 13 to 16.

Images