Array substrate, display panel and reflective display device

Abstract

The invention discloses an array substrate, a display panel and a reflective display device, and relates to the technical field of display equipment. The array substrate comprises a substrate base plate, a first electrode, a second electrode, a third electrode and a fourth electrode, the first sub-pixel is arranged on the substrate base plate; the second sub-pixels and the first sub-pixels are arranged at intervals in the first direction; the third sub-pixels and the first sub-pixels are arranged at intervals in the second direction; and the fourth sub-pixels are adjacent to the second sub-pixels and the third sub-pixels at intervals. According to the invention, quantum dots and pigment particles are combined to realize synergistic interaction for the first time and are applied to color reflective display devices. On one hand, the quantum dot material has the advantages of better short-wavelength absorption, capability of converting short-wavelength light into fluorescent light, narrower half-peak width (about 22nm) of the fluorescent light and the like; on the other hand, the pigment particles have the advantage of being better in long-wavelength absorption, and the defects of quantum dots in the pigment particles can be exactly overcome; and the optical performance and the dynamic performance are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display equipment, and in particular to an array substrate, a display panel and a reflective display device. Background Art

[0002] The current mainstream LED, LCD and OLED display technologies have bright colors and high contrast, but they are highly reflective under strong light and require continuous power supply. Color reflective display uses ambient light, has low energy consumption and good visibility, and the color performance is increasingly rich and natural, providing an immersive experience.

[0003] Electronic paper is a general term for reflective paper-like displays that are ultra-thin, light, and low-energy, and can provide a paper-like visual experience. Even in the sun, there is no blind spot for reading, and the visual effect is good. Electronic paper includes electrophoretic display, electrowetting display, MEMS electromechanical interference display, cholesterol liquid crystal display, and other technical routes.

[0004] Existing color reflective displays are still in their infancy, with a narrow research scope. In addition, the products exhibited by various companies generally have problems such as slow refresh speed, low resolution, low imaging saturation, small color gamut, rigid display, and excessively high cost. The above technical defects and application difficulties need to be overcome urgently.

[0005] Quantum dots have attracted much attention as a cutting-edge technology for new display materials. As semiconductor nanomaterials, quantum dots have the advantages of high luminous efficiency, pure color and low energy consumption. Colloidal quantum dots have small particle size, discrete energy levels, high color purity, cover the entire visible spectrum, and can be prepared in solution to reduce costs. Quantum dots are used in displays in two ways: electrical injection (QLED) and photoexcitation (such as QDs-LCD). QLED will take some time to be industrialized due to its immature technology; although QDs-LCD has launched products, the existing quantum dots cannot maintain high efficiency and stability in display devices, resulting in high costs and short lifespans. The industry has not yet proposed an effective solution to the above-mentioned problems. Summary of the invention

[0006] Purpose of the invention: To provide an array substrate, a display panel and a reflective display device to solve at least one of the problems existing in the above-mentioned prior art.

[0007] Technical solution: An array substrate, comprising: substrate substrate; A first sub-pixel is disposed on the base substrate; A second sub-pixel is arranged along a first direction with a spacing from the first sub-pixel; A third sub-pixel is arranged along the second direction with a gap between the first sub-pixel and the first sub-pixel; and a fourth sub-pixel, disposed adjacent to the second sub-pixel and the third sub-pixel at intervals; Wherein, the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel are arranged in a preset direction to form a minimum pixel unit; The first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel respectively include quantum dots of a preset color and pigment particles matching the preset color.

[0008] Preferably, the first sub-pixel comprises: red quantum dots and red pigment particles, wherein the red quantum dots and the red pigment particles are mixed in a preset ratio to prepare a first cooperative coupling material for red display; The second sub-pixel includes: blue quantum dots and blue pigment particles, wherein the blue quantum dots and the blue pigment particles are mixed in a preset ratio to prepare a second cooperative coupling material for blue display; The third sub-pixel includes: black pigment particles; The fourth sub-pixel includes: green quantum dots and green pigment particles, and the green quantum dots and the green pigment particles are mixed in a preset ratio to prepare a fourth cooperative coupling material for green display.

[0009] Preferably, the mixing mass ratio of the quantum dots to the pigment particles is in the range of 0:1-1:0.

[0010] Preferably, the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel have a length of 5nm-100mm, a width of 5nm-100mm and a thickness of 5nm-100mm.

[0011] Preferably, the quantum dots and the pigment particles are in powder form or solution form; Among them, when the quantum dots and the pigment particles are solution solvents, the quantum dots and the pigment particles include: one or more mixed liquids of chloroform, toluene, chlorobenzene, alkanes, olefins, aromatic hydrocarbons, alcohols, ethyl acetate, halogenated alkanes, halogenated olefins, halogenated aromatic hydrocarbons, glycol derivatives, ketones, toluene, o-xylene, m-xylene, p-xylene, fluorocarbons, esters, tetrahydrofuran, petroleum ether, dimethyl sulfoxide, and water solvents.

[0012] Preferably, the quantum dots further include: one or more quantum dot luminescent materials of different morphologies with a central emission wavelength of 350nm-1000nm, or a mixture of the quantum dots and a specified type of luminescent material; The quantum dot comprises: a quantum dot core and a shell material covering the quantum dot core, wherein the quantum dot core and the shell material are CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, Cu x In1-x S, Cu x In 1-x Se y S 1-y 、Ag x In 1-x S, Ag x In 1-x Se y S 1-y 、InP、Cu x Zn 1-x Se, Zn x Mn 1-x Single-core nanoparticles of Se, PbS, PbSe, Cd alloy materials, In alloy materials, Zn alloy materials or perovskite materials; Alternatively, at least one layer of any one or a combination of at least two of CdSe, CdS, ZnO, ZnS, ZnSe, ZnTe or alloy materials is coated on the periphery of the shell material.

[0013] Preferably, the pigment particles further include: one or more pigment particles of different morphologies with a peak reflection wavelength of 350nm-1000nm, or a mixture of the pigment particles and a specific type with a high reflection spectrum; The pigment particles are any one of organic dyes, organic inks, inorganic dyes, inorganic inks, natural pigments, artificial synthetic pigments, graphite, metal oxides and particles of different morphologies thereof, metals and particles of different morphologies thereof, and SiO2, or a combination of at least two of them.

[0014] Preferably, the states of the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel are any one of liquid pixel, solid pixel, gas pixel, liquid crystal phase pixel, photonic crystal, microarray, capsule, microcapsule, microcup, microsphere or pixelated film, or a combination of at least two of the states.

[0015] In order to achieve the above objective, according to another aspect of the present application, a display panel is also provided.

[0016] The display panel according to the present application includes the array substrate as described above; It also includes: minimum pixel units arranged in an array at intervals along the first direction and the second direction respectively.

[0017] In order to achieve the above objective, according to another aspect of the present application, a reflective display device is also provided.

[0018] The reflective display device according to the present application includes the display panel as described above.

[0019] Beneficial effect: In the embodiment of the present application, quantum dots are combined with pigment particles, and the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel are arranged in a preset direction to form a minimum pixel unit; the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel respectively contain: quantum dots of preset colors and pigment particles matching the preset colors, thereby achieving the purpose of applying quantum dots in color reflective displays, narrowing the spectral emission, increasing the color gamut, increasing the brightness and increasing the response frequency, thereby achieving the technical effects of improving stability, reducing production costs and increasing service life, and further solving the problem that existing quantum dots cannot maintain high efficiency and stability in display devices, resulting in high costs and short lifespan. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is various spectra of quantum dots, pigment particles, and cooperatively coupled materials of the present invention; Figure 2 It is a spectrum comparison diagram before and after the synergistic enhancement of the quantum dots and pigment particles of the present invention; Figure 3 It is the light emission (reflection and fluorescence superposition) spectrum of the three primary colors of red, green and blue after the synergistic effect of the quantum dots and pigment particles of the present invention; Figure 4 It is the light emission spectrum of the ambient light spectrum and quantum dot synergistic color reflective display device under different lighting environments of the present invention; and Figure 5 It is a principle diagram of the quantum dot synergistic color reflective display device of the present invention.

[0021] The accompanying drawings are marked as follows: 1. First sub-pixel; 2. The second sub-pixel; 3. The third sub-pixel; 4. The fourth sub-pixel; 5. Minimum pixel unit; 6. Substrate substrate; 7. Side-entry excitation light source. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to better understand the technical problems in this application, the following summary is made: 1. The current technical problems in the field of color reflective display are: low brightness, slow response speed and narrow color gamut.

[0027] 2. The current problems with quantum dot display technology are: the distance to the excitation light source is relatively close, and there are problems such as blue light aging and thermal aging, which makes the packaging cost of the applied display products high and the life span short.

[0028] 3. The current problems in the field of quantum dot synergistic color reflective display technology are: ① Quantum dot materials have no absorption in the long-wave band, but directly reflect. The color of a single quantum dot reflective display is a mixture of all light in the long-wave band, and the color display deviation is large, and it cannot effectively improve the color gamut of the display device. ② The backlight excites the quantum dot to emit light, which is not a total reflective display. There is still flickering and blue light, and backlight illumination is required, which consumes power continuously.

[0029] like Figure 1-5 As shown, the present application relates to an array substrate, a display panel and a reflective display device. Figure 5As shown, the array substrate includes: a base substrate 6; the base substrate 6 refers to the basic material used to carry each functional layer; in the present application, the base substrate 6 constitutes the supporting bottom layer of the pixel structure. Its main function is to provide mechanical support for the pixel unit, and in some cases, it serves as a base material for the conductive or insulating layer to ensure the stability and integration between the layers. Preferably, the material of the base substrate 6 usually includes glass, alumina ceramics, silicon wafers or polymer films, etc. Of course, the specific selection depends on the application scenario and display performance requirements.

[0030] The first sub-pixel 1 is disposed on the base substrate 6 and can realize the function of emitting light of a specific color, thereby achieving the effect of the corresponding function. In the present application, the first sub-pixel 1 is used for red display.

[0031] The second sub-pixel 2 is spaced apart from the first sub-pixel 1 along the first direction; the spacing between the two sub-pixels can improve the optical separation between the sub-pixels and avoid crosstalk between different colors; the structure and function of the second sub-pixel 2 are similar to those of the first sub-pixel 1, but its luminous color and the spectral characteristics of the matching pigment particles are different, and it is used to display another basic color of the system. In this application, the second sub-pixel 2 is used for blue display. The first direction refers to the vertical direction, which is also the Y-axis direction in the two coordinate systems.

[0032] The third sub-pixel 3 is arranged at intervals from the first sub-pixel 1 along the second direction; the luminous color of the third sub-pixel 3 and the matching pigment particles are also different, and its arrangement further enriches the color combination of the display system and provides a basis for multi-color or full-color display. In this application, the third sub-pixel 3 is used for black display. The second direction refers to the horizontal direction; it is also the X-axis direction in the two coordinate systems.

[0033] The fourth sub-pixel 4 is arranged adjacent to the second sub-pixel 2 and the third sub-pixel 3 respectively; the fourth sub-pixel 4 is usually located at the center or diagonal position of the sub-pixel unit, and its luminous color complements or enhances the colors of the first three sub-pixels to form a complete minimum pixel unit 5 structure. Not only does it improve the color reproduction ability, but it also optimizes the overall resolution and brightness distribution of the display. In this application, the fourth sub-pixel 4 is used for green display.

[0034] The first sub-pixel 1, the second sub-pixel 2, the third sub-pixel 3 and the fourth sub-pixel 4 are arranged in a preset direction to form a minimum pixel unit 5; the minimum pixel unit 5 is a basic unit repeatedly arranged in a display system, usually composed of three to four sub-pixels arranged in a rectangular, diamond or other geometric form. The arrangement in the preset direction can be adjusted according to the requirements of different display technologies (such as RGBG arrangement, RGGB arrangement) to achieve the best balance between brightness uniformity, color accuracy and display resolution.

[0035] It should be noted that the sub-pixels can be arranged in the following forms: Rectangular arrangement: The first sub-pixel 1, the second sub-pixel 2, the third sub-pixel 3 and the fourth sub-pixel 4 are arranged in a rectangular frame, which is suitable for traditional display panels. Diamond arrangement: Suitable for high-resolution display requirements, especially commonly used in OLED or quantum dot display technology. Spiral arrangement: In order to improve viewing angle uniformity and display quality, a more complex arrangement can be used.

[0036] The first sub-pixel 1 , the second sub-pixel 2 , the third sub-pixel 3 and the fourth sub-pixel 4 respectively include quantum dots of a preset color and pigment particles matching the preset color.

[0037] Quantum dots have the characteristics of narrow-band luminescence and high color purity, and can accurately present colors within a preset spectral range; when they are applied to color reflective display technology, they can avoid blue light aging, and their high efficiency and narrow luminescence characteristics can improve refresh speed, resolution, imaging saturation and color gamut.

[0038] Pigment particles improve luminous efficiency and display contrast by optical enhancement and absorption of non-essential light bands, while providing stable physical and chemical protection.

[0039] It should be noted that the pixel setting method can be: the color filter is accurately placed on each sub-pixel according to the design requirements, usually achieved by physical deposition or photolithography technology.

[0040] By mixing and combining the quantum dots with fluorescence peaks in the red, green and blue bands with the color particles with the peak wavelengths of the reflection spectrum in the red, green and blue bands in a certain proportion, the more equal the fluorescence peak and the peak wavelength of the reflection spectrum, the better the effect. The combining methods include but are not limited to: direct mixing, ligand exchange, single shell coating, reverse microemulsion, ligand connection, integrated coating, etc.

[0041] This application proposes to combine quantum dots with pigment particles to achieve synergistic effects and apply them to color reflective display devices. On the one hand, quantum dot materials have advantages such as better short-wavelength absorption, short-wavelength light can be converted into fluorescent light, and the half-peak width of fluorescent light is narrower (about 22nm). On the other hand, pigment particles have the advantage of better long-wavelength absorption, which can just make up for the shortcomings of quantum dots in this regard.

[0042] Optical aspect: The combination of pigment particles and quantum dot materials can improve the absorption of short-wavelength light of color reflective display devices, increase the light conversion ratio (increase brightness), narrow the half-peak width (increase color gamut), etc. Dynamic aspect: The coordinated movement of pigment particles + quantum dots can increase the overall specific surface area, carry more ligands, and have a higher charge potential, thereby improving the response speed of color reflective display devices.

[0043] Specifically, the present application is further explained in conjunction with the spectrum diagram: Figure 1 As shown, it is a variety of spectra of quantum dots, pigment particles, and cooperative coupling materials. Among them, (a) is the absorption spectrum of a certain pigment particle. (b) is the reflection spectrum corresponding to the pigment particle. (c) is the fluorescence emission spectrum of the quantum dot that can produce optical synergy with the pigment particle. (d) is the absorption spectrum of the quantum dot. (e) is the reflection spectrum corresponding to the quantum dot. (f) is the total spectrum after the reflection spectrum corresponding to the quantum dot and the fluorescence spectrum are superimposed. (g) is the absorption spectrum of the material after the two pigment particles and quantum dot materials are mixed in a certain proportion. (h) is the reflection spectrum corresponding to the material after the two pigment particles and quantum dot materials are mixed in a certain proportion. (i) is the total spectrum after the reflection spectrum corresponding to the material after the two pigment particles and quantum dot materials are mixed in a certain proportion and the fluorescence spectrum are superimposed.

[0044] like Figure 2 As shown, it is a spectrum comparison diagram before and after the synergistic enhancement of quantum dots and pigment particles. Among them, (a) is the absorption spectrum comparison of quantum dots and pigment particles before and after the synergistic enhancement, the red line is the absorption spectrum of quantum dots, the black line is the absorption spectrum of pigment particles, and the blue line is the absorption spectrum of the material after the two pigment particles and quantum dot materials are mixed in a certain proportion. (b) is the light emission (reflection and fluorescence superposition) spectrum comparison of quantum dots and pigment particles before and after the synergistic enhancement, the red line is the light emission (reflection and fluorescence superposition) spectrum of quantum dots, the black line is the light emission (reflection) spectrum of pigment particles, and the blue line is the light emission (reflection and fluorescence superposition) spectrum of the material after the two pigment particles and quantum dot materials are mixed in a certain proportion.

[0045] like Figure 3 As shown, it is the red, green and blue primary color light emission (reflection and fluorescence superposition) spectrum after the synergistic enhancement of quantum dots and pigment particles. Among them, the red line is the light emission spectrum of the red quantum dot synergistic coupling material, the green line is the light emission spectrum of the green quantum dot synergistic coupling material, and the blue line is the light emission spectrum of the blue quantum dot synergistic coupling material.

[0046] like Figure 4As shown, it is the ambient light spectrum and the light emission spectrum of the quantum dot synergistic color reflective display device under different lighting environments. Among them, (a) is the light source spectrum of the outdoor bright environment (i.e., the daylight spectrum). (b) is the red, green, and blue primary color light emission (reflection and fluorescence superposition) spectrum of the quantum dot synergistic color reflective display device under the outdoor bright lighting environment, where the red line is the light emission spectrum of the red sub-pixel of the quantum dot synergistic color reflective display device, the green line is the light emission spectrum of the green sub-pixel of the quantum dot synergistic color reflective display device, and the blue line is the light emission spectrum of the blue sub-pixel of the quantum dot synergistic color reflective display device. Among them, (c) is the light source spectrum of the indoor lighting environment (commonly used as the LED lighting source spectrum). (d) is the red, green and blue primary color light emission (reflection and fluorescence superposition) spectrum of the quantum dot synergistic color reflective display device under indoor lighting environment, where the red line is the light emission spectrum of the red sub-pixel of the quantum dot synergistic color reflective display device, the green line is the light emission spectrum of the green sub-pixel of the quantum dot synergistic color reflective display device, and the blue line is the light emission spectrum of the blue sub-pixel of the quantum dot synergistic color reflective display device. (e) is the red, green and blue primary color light emission (fluorescence) spectrum of the quantum dot synergistic color reflective display device under backlight excitation in a dark environment, where the red line is the light emission spectrum of the red sub-pixel of the quantum dot synergistic color reflective display device, the green line is the light emission spectrum of the green sub-pixel of the quantum dot synergistic color reflective display device, and the blue line is the light emission spectrum of the blue sub-pixel of the quantum dot synergistic color reflective display device. It should be noted that this function is an optional function that can be increased or decreased, and this function can only be realized when there is a backlight excitation light source.

[0047] like Figure 5 As shown, it is a schematic diagram of a quantum dot synergistic color reflective display device. 1 is a sub-pixel for red display made of a synergistic coupling material in which red quantum dots are mixed with red pigment particles. 2 is a sub-pixel for blue display made of a synergistic coupling material in which blue quantum dots are mixed with blue pigment particles. 3 is a sub-pixel for black display made of black pigment particles. 4 is a sub-pixel for green display made of a synergistic coupling material in which green quantum dots are mixed with green pigment particles. 5 is a pixel, which includes four sub-pixels: red, green, blue and black. 6 is a reflective display device panel. 7 is a side-entry excitation light source 7 outside the display panel frame.

[0048] In summary, it can be seen from the above spectra that Figure 1 As shown, Figure 1 a is the absorption spectrum of pigment particles commonly used in color reflective displays, Figure 1 b is its corresponding reflectance spectrum. Due to the properties of the pigment particles themselves, the half-width of the reflectance spectrum is relatively wide (>50nm), resulting in a narrow color gamut of the final display device and inability to achieve high-quality color reflective display. Figure 1 c is a typical quantum dot photoluminescence fluorescence spectrum. Under short-wavelength light excitation, the half-peak width of the spectrum reaches <25nm. Figure 1 d is the absorption spectrum of a typical quantum dot material, which has high absorption in the wavelength band shorter than the absorption peak wavelength, but very little absorption in the wavelength band longer than the absorption peak wavelength. Figure 1 e is the reflection spectrum corresponding to the absorption spectrum.

[0049] If quantum dots are used as pigment particles in reflective displays, the final light spectrum is the superposition of the quantum dot reflection spectrum (full wavelength illumination of the illumination source) and the fluorescence spectrum (short wavelength excitation of the illumination source). The weight of the superposition of the two spectra is determined by the quantum dot fluorescence quantum yield and the material reflection cross section. Figure 1 f shows the final light spectrum when the fluorescence spectrum and the reflection spectrum are superimposed with a weight of 1:1 (this is one of the possible cases). From this spectrum, it can be seen that compared with the light spectrum of the pigment particles, this spectrum has a lot of light leakage at long wavelengths, which will cause the final color to deviate greatly from the design.

[0050] This application combines quantum dots with pigment particles as a cooperative coupling material for color reflective display. The mixing mass ratio of quantum dots and pigment particles determines the weight of the two parts when the absorption spectrum of the cooperative coupling material is superimposed. Figure 1 g shows the absorption spectrum of the cooperatively coupled material when the absorption spectra of quantum dots and pigment particles are superimposed with a weight of 1:1 (this is one of the possible cases). Figure 1 h is the reflection spectrum corresponding to the absorption spectrum. The final light emission spectrum is the superposition of the reflection spectrum of the cooperative coupling material and the fluorescence spectrum (i.e., the fluorescence spectrum of the quantum dot material). The weight of the superposition of the two spectra is determined by the quantum dot fluorescence quantum yield and the reflection cross section of the cooperative coupling material. Figure 1 i shows the final light spectrum when the fluorescence spectrum and the reflection spectrum are superimposed with a weight of 1:1 (this is one of the possible cases). From this spectrum, it can be seen that due to the effect of quantum dot fluorescence, the final light spectrum is significantly narrowed; due to the effect of pigment particles, the light leakage that may exist in the long wavelength light is completely eliminated. This spectrum is more conducive to the display of wide color gamut and high quality colors.

[0051] Figure 2 a and 2b compare the absorption spectra of quantum dots, pigment particles, and synergistically coupled materials with the light emission spectra, respectively. It can be seen that the light emission spectrum after the synergistic enhancement of quantum dots and pigment particles is the narrowest, and there is no color deviation caused by long-spectrum light leakage.

[0052] Since wide color gamut display devices require red, green, and blue primary color sub-pixels to achieve full color display, Figure 3The typical light emission spectrum of the red, green and blue primary color cooperative coupling material is shown. Based on this spectrum, the synergistic color reflective display device made of the red, green and blue primary color cooperative coupling material is placed in a bright outdoor environment (sunlight, light source spectrum such as Figure 4 a) in indoor lighting environment (LED light source, light source spectrum as shown in Figure 4 c) in a dark environment, the three primary color light spectra are as follows: Figure 4 b, 4d, and 4e. However, the light output in a dark environment is not a reflective display, but is realized by backlight stimulating quantum dot fluorescence. Therefore, it is only an optional function of the display device of the present invention, which can be added or removed. However, this function also makes up for the disadvantage that the reflective display device has a very poor display effect in a dark environment.

[0053] This application also has the following beneficial effects: 1. Apply quantum dots in color reflective displays to narrow the spectral emission, increase the color gamut, improve brightness, and increase the response frequency. Quantum dots themselves can absorb short-wavelength light and convert this part of the light into fluorescence of a wavelength determined by their own properties, and the fluorescence half-peak width is narrow (half-peak width is generally <25nm), which can narrow the final light spectrum in the spectrum, thereby increasing the final display color gamut. After this part of the short-wavelength light that should have been absorbed by the pigment particles and converted into heat is absorbed by the quantum dots, it is converted into fluorescence with high efficiency (fluorescence quantum yield is generally >90%), thereby improving the utilization rate of the illumination light and increasing the brightness of the reflective display device. The quantum dots themselves are small in size (generally 2nm-30nm in diameter) and carry a large number of ligands and surface potentials in the fluid, which can increase the overall specific surface area, overall load and movement speed under the action of the external field in the reflective display fluid, thereby improving the response speed of the reflective display.

[0054] 2. While applying quantum dots, retain the pigment particles in the color reflective display to absorb the long-wavelength illumination light that quantum dots cannot absorb, avoid huge deviations in the color of the light spectrum, narrow the half-peak width, and increase the color gamut. If quantum dots are used as pigment particles alone in reflective display, the final light spectrum is the spectrum superimposed by the quantum dot reflection spectrum (full-wavelength irradiation of the illumination light source) and the fluorescence spectrum (short-wavelength excitation of the illumination light source). Since quantum dots absorb very little at long wavelengths, compared with the light spectrum of pigment particles, the quantum dot light spectrum has a large amount of light leakage at long wavelengths, which will cause the final color to deviate greatly from the design. If the pigment particles are retained in the color reflective display, the final light spectrum is significantly narrowed due to the effect of quantum dot fluorescence; due to the effect of pigment particles, the light leakage that may exist in the long-wavelength light is completely eliminated. This spectrum is more conducive to the display of wide color gamut and high-quality colors.

[0055] 3. The application of quantum dots enables color reflective displays to be equipped with optional backlight excitation light sources, which can excite quantum dots to emit fluorescence and make up for the disadvantage of low brightness in dark environments. In dark environments, reflective displays lose sufficient lighting intensity, and high-brightness display cannot be achieved theoretically with reflective displays alone. In the original reflective display, pigment particles cannot be excited to emit light by light sources. At this time, the application of quantum dots can be excited to emit light by light sources, and can also achieve a narrower half-width, wider color gamut, and higher brightness than reflective displays, so that color reflective display devices can still have better display effects in dark environments.

[0056] From the above description, it can be seen that the present application achieves the following technical effects: In the embodiment of the present application, quantum dots are combined with pigment particles, and the first sub-pixel 1, the second sub-pixel 2, the third sub-pixel 3 and the fourth sub-pixel 4 are arranged in a preset direction to form a minimum pixel unit 5; the first sub-pixel 1, the second sub-pixel 2, the third sub-pixel 3 and the fourth sub-pixel 4 respectively contain: quantum dots of preset colors and pigment particles matching the preset colors, so as to achieve the purpose of applying quantum dots in color reflective display, narrowing the spectral emission, increasing the color gamut, improving the brightness and increasing the response frequency, thereby achieving the technical effect of improving stability, reducing production costs and increasing service life, and further solving the technical problem that the existing quantum dots cannot maintain high efficiency and stability in display devices, resulting in high cost and short life.

[0057] Furthermore, the first sub-pixel 1 includes: red quantum dots and red pigment particles, and the red quantum dots and the red pigment particles are mixed in a preset ratio to prepare a first cooperative coupling material for red display. It can be understood that the red quantum dots refer to quantum dot materials that can emit red light of a specific wavelength, and are usually prepared from inorganic semiconductor materials; the red pigment particles refer to micrometer or nanometer-scale particles that can reflect and absorb light of a specific wavelength band (red light), and are usually prepared from inorganic or organic pigments.

[0058] The red quantum dots and the red pigment particles are mixed in a certain ratio to give full play to the synergistic effect of the two, improve the optical performance and meet the requirements of red display. The selection of the preset ratio can be determined according to the actual use requirements.

[0059] Optimization of optical performance: The optimal ratio is determined through experiments to balance the luminescence of red quantum dots with the absorption / reflection characteristics of red pigment particles, ensuring high brightness and high purity of red light.

[0060] Improved stability: Pigment particles can enhance the material’s environmental resistance, such as resistance to UV aging.

[0061] Application scenario adaptation: Adjust the mixing ratio according to the actual display device requirements (such as brightness, color saturation, color gamut range, etc.).

[0062] Furthermore, the second sub-pixel 2 includes: blue quantum dots and blue pigment particles, which are mixed in a preset ratio to prepare a second cooperative coupling material for blue display. It can be understood that blue quantum dots refer to nano-scale semiconductor materials that can emit blue light of a specific wavelength; blue pigment particles refer to granular materials that absorb other wavelengths of light and reflect blue light, and are often used to improve the output efficiency and color stability of blue light; The blue quantum dots and blue pigment particles are mixed in a preset ratio, and the preset ratio can be selected according to actual usage requirements.

[0063] Optical enhancement: The high brightness luminescence of blue quantum dots and the light absorption / reflection properties of blue pigment particles are combined to achieve the best blue display effect.

[0064] Environmental adaptability: The appropriate proportion of pigment particles can improve the material's antioxidant and UV aging resistance.

[0065] Actual requirements: Adjust the mixing ratio according to the brightness requirements of the blue sub-pixel and the color gamut range of the display device.

[0066] Furthermore, the third sub-pixel 3 includes black pigment particles. It is understood that the black pigment particles refer to tiny particles with good light absorption performance, which can absorb full-band visible light and present a black appearance. Its main function is to improve the contrast of the display screen and reduce light reflection and light leakage.

[0067] It is important to know that black pigment particles often include the following types: 1. Inorganic pigments: Carbon black: mainly composed of nano-scale carbon particles, with strong light absorption ability and chemical stability. Iron oxide black (Fe3O4): has excellent heat resistance and antioxidant properties. Titanium oxide black: a titanium-based black pigment obtained through a doping process, with excellent optical and environmental stability.

[0068] 2. Organic pigments: Phthalocyanine black: A black pigment based on phthalocyanine molecules, with high coloring power and excellent dispersibility. Quinone black pigment: Synthesized through special organic compounds, it exhibits efficient light absorption properties.

[0069] Further, the fourth sub-pixel 4 includes: green quantum dots and green pigment particles, and the green quantum dots and the green pigment particles are mixed in a preset ratio to prepare a fourth cooperative coupling material for green display. It can be understood that the green quantum dots refer to nanocrystals with good photoluminescence properties, which can emit high-purity green light within a specific wavelength range; Green pigment particles refer to tiny particles prepared by chemical or physical means, which can absorb light of a specific wavelength and appear green. Green pigment particles are used in conjunction with green quantum dots to enhance green display performance.

[0070] Green quantum dots and green pigment particles are mixed in a specific ratio to form a synergistic coupling material that can fully leverage the optical advantages of both and enhance green display performance.

[0071] Furthermore, the mixing mass ratio of the quantum dots to the pigment particles is in the range of 0:1-1:0. It is understood that when the mixing mass ratio is 0:1, it means that only the pigment particles are included without the quantum dots; When the mixing mass ratio is 1:0, it means that only quantum dots are included without pigment particles; the middle range means that quantum dots and pigment particles are mixed in different proportions; for example, 0.5:0.5 means that the mass ratio of quantum dots and pigment particles is equal.

[0072] The above range covers three situations: pure quantum dot display (only quantum dots), pure pigment particle display (only pigment particles), and mixed display of quantum dots and pigment particles.

[0073] Of course, in practical applications, the mixing ratio of quantum dots and pigment particles can be flexibly selected according to the design requirements of the display device.

[0074] For example, if higher photoluminescence efficiency is required, the proportion of quantum dots tends to be increased.

[0075] If a stronger light shielding effect and stability are required, the proportion of pigment particles tends to be increased.

[0076] Furthermore, the mixing mass ratio of the quantum dots to the pigment particles is in the range of 20:1-1:10. It is understood that when the mixing mass ratio is 20:1, it means that the mass proportion of the quantum dots is much higher than that of the pigment particles, that is, the quantum dots are mainly present, with only a small amount of pigment particles added.

[0077] When the mixing mass ratio is 1:10, it means that the mass proportion of the pigment particles is much higher than that of the quantum dots, that is, the pigment particles are the main components, and only a small amount of quantum dots are added.

[0078] The middle range (such as 5:1, 1:2, etc.) means that quantum dots and pigment particles are mixed in a certain proportion, which utilizes both the luminescent properties of quantum dots and the light absorption and protective properties of pigment particles.

[0079] The above range further limits the mixing ratio of quantum dots and pigment particles, which is closer to the actual application requirements of display materials.

[0080] For example: If the quantum dot ratio is high (such as 20:1, 10:1), it is suitable for display applications that require high luminous efficiency and high brightness.

[0081] If the pigment particle ratio is higher (such as 1:5, 1:10), it is suitable for display scenarios that require higher contrast and stronger light shielding capabilities.

[0082] By limiting the mixing ratio range, the synergistic optimization of the quantum dot luminescence performance and the optical shielding performance of the pigment particles can be achieved.

[0083] For example, a ratio of 5:1 achieves a balance between brightness and color purity.

[0084] When the ratio is 1:5, the stability of the material can be significantly improved, avoiding the performance degradation of quantum dots caused by light or thermal degradation.

[0085] Further, the length of the first sub-pixel 1, the second sub-pixel 2, the third sub-pixel 3 and the fourth sub-pixel 4 is 5nm-100mm, the width is 5nm-100mm, and the thickness is 5nm-100mm. It can be understood that a variety of sizes can be selected to meet the needs of various usage scenarios.

[0086] Further, the length of the first sub-pixel 1, the second sub-pixel 2, the third sub-pixel 3 and the fourth sub-pixel 4 is 100nm-1mm, the width is 100nm-1mm, and the thickness is 100nm-1mm. It can be understood that it can meet the use requirements of higher precision.

[0087] Furthermore, the surface roughness of the first sub-pixel 1, the second sub-pixel 2, the third sub-pixel 3 and the fourth sub-pixel 4 is 0-100 μm. It can be understood that the above range is applicable to low-resolution and large-size display devices.

[0088] Furthermore, the surface roughness of the first sub-pixel 1, the second sub-pixel 2, the third sub-pixel 3 and the fourth sub-pixel 4 is 0-100 nm. It can be understood that the sub-pixels within this range are almost mirror-smooth, which helps to improve optical performance and ensure uniform light propagation and accurate color reproduction.

[0089] Furthermore, the quantum dots and the pigment particles are in powder form or in solution form; Wherein, when the quantum dots and the pigment particles are solution solvents, the quantum dots and the pigment particles include: chloroform, toluene, chlorobenzene, alkanes, alkenes, aromatic hydrocarbons, alcohols, ethyl acetate, halogenated alkanes, halogenated alkenes, halogenated aromatic hydrocarbons, glycol derivatives, ketones, toluene, o-xylene, m-xylene, p-xylene, fluorochloroethanes, esters, tetrahydrofuran, petroleum ether, dimethyl sulfoxide, and one or more mixed liquids of water solvents. It can be understood that the effect of multiple materials being available for selection can be achieved, thereby achieving the effect of flexible use.

[0090] Furthermore, the quantum dots also include: one or more quantum dot luminescent materials of different morphologies with central emission wavelengths between 350nm and 1000nm, or a mixture of the quantum dots and a specified type of luminescent material. It is understood that quantum dots are semiconductor nanocrystals with size-dependent luminescent properties, and their central emission wavelength can be adjusted by controlling the size and material composition of the quantum dots.

[0091] One or more quantum dot luminescent materials with different morphologies and central emission wavelengths between 350nm and 1000nm: different morphologies include spheres, rods, stars, etc. Different morphologies may affect optical properties such as polarization and luminescence efficiency.

[0092] Quantum dots with different central emission wavelengths can cover a wide spectral range from ultraviolet (UV), visible light (VIS) to near infrared (NIR).

[0093] Mixture of quantum dots and specified types of luminescent materials: can be mixed with phosphors, organic luminescent materials (OLED materials) or other nanomaterials to further adjust the luminescent properties or enhance the brightness. The specified types of luminescent materials can be phosphors or organic luminescent materials.

[0094] Furthermore, the pigment particles also include: one or more pigment particles of different morphologies with peak reflection wavelengths between 350nm and 1000nm, or a mixture of the pigment particles and a specific type with a high reflection spectrum. It is understood that the pigment particles are an opaque solid particle material that provides a specific color or reflection property by scattering and absorbing light. Among them, the high reflection is a mixture of more than 20% of the spectrum.

[0095] One or more pigment particles with different morphologies and peak reflection wavelengths between 350nm and 1000nm can be used in different morphologies including but not limited to the following: Spherical: Evenly scatters light, providing stable color and reflectivity. Flake: Enhances directional reflection, suitable for applications with high gloss or brightness requirements. Prismatic: Produces multi-angle reflection light effects, increasing optical complexity.

[0096] It should be noted that the peak reflection wavelength range can be: 350nm-400nm: reflects ultraviolet light and can be used for UV light shielding materials. 400nm-700nm: reflects visible light to achieve different color performances. 700nm-1000nm: reflects near-infrared light and is used for infrared signal enhancement or thermal insulation coatings.

[0097] Mixtures with specific types of materials with high reflectance spectra: Highly reflective spectral materials: Micron-sized titanium dioxide particles: have high refractive index and excellent white light reflection performance. Zinc oxide particles: reflect ultraviolet light and have certain antibacterial properties. Mica particles: enhance the gloss and form pearlescent or metallic light effects.

[0098] Furthermore, the quantum dot comprises: a quantum dot core and a shell material covering the quantum dot core, wherein the quantum dot core and the shell material are CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, Cu x In 1-x S, Cu x In 1-x Se y S 1-y 、Ag x In 1-x S, Ag x In 1-x Se y S 1-y 、InP、Cu x Zn 1-x Se, Zn x Mn 1-x Single-core nanoparticles of Se, PbS, PbSe, Cd alloy materials, In alloy materials, Zn alloy materials or perovskite materials; Or, at least one layer of CdSe, CdS, ZnO, ZnS, ZnSe, ZnTe or any one or a combination of at least two of the alloy materials is coated on the periphery of the shell material. It is understandable that a variety of materials can be selected to achieve the effect of flexible use. The quantum dot core is the basic structure of the quantum dot, which determines the basic properties of the quantum dot, such as absorption, emission wavelength and its optical properties; The outer layer of quantum dots is usually coated with one or more layers of material (shell material), which has an important influence on the optical properties, stability and durability of quantum dots. The shell material can effectively prevent quantum dots from photobleaching, oxidation or depolymerization during use.

[0099] Further, the pigment particles are any one of organic dyes, organic inks, inorganic dyes, inorganic inks, natural pigments, artificial synthetic pigments, graphite, metal oxides and particles of different morphologies, metals and particles of different morphologies, and SiO2, or a combination of at least two of them. It is understood that organic dyes: have strong color saturation and wide color selectivity; organic inks: are composed of organic dyes and solvents or adhesives; inorganic dyes: are made of inorganic substances (such as metal oxides, salts, etc.), and have high heat resistance and stability; inorganic inks: are similar to inorganic dyes, but contain pigment particles instead of dissolved dyes, and usually have strong hiding power and light resistance; artificial synthetic pigments: are made by chemical synthesis, and usually have high color stability, brightness and saturation.

[0100] Further, the states of the first sub-pixel 1, the second sub-pixel 2, the third sub-pixel 3 and the fourth sub-pixel 4 are any one of liquid pixels, solid pixels, gas pixels, liquid crystal phase pixels, photonic crystals, microarrays, capsules, microcapsules, microcups, microspheres or pixelated films, or a combination of at least two states. It is understandable that by providing multiple states to choose from, the effect of flexible use can be achieved, thereby being able to meet the needs of various usage scenarios.

[0101] Specifically, a liquid pixel refers to a pixel unit containing a liquid component, and usually uses liquid crystal, liquid electrochromic material or other liquid substances to achieve the display effect; Solid-state pixels refer to pixel units made of solid materials, such as pixels based on quantum dots or solid semiconductors; Gas pixel refers to a display unit controlled by gas discharge or gas medium, which is common in plasma display (PDP) and some types of gas discharge display technology; Liquid crystal phase pixels usually refer to the use of liquid crystal materials to adjust the polarization state of light, a common type of pixel in liquid crystal display technology; Photonic crystal refers to a material with a periodic structure that can control the display effect by regulating the propagation characteristics of light; Microarray refers to multiple tiny pixel units arranged in an array, usually used for large-scale parallel processing or display; Capsule pixels refer to tiny particles that encapsulate liquid or gas. They are activated by external signals to change the state of the material inside, thereby achieving changes in color or brightness. Microcapsules are tiny substances (such as pigments, liquids, or gases) encapsulated in a deformable capsule structure, which usually changes its state under external stimuli; Microcup pixels are made of tiny containers (similar to microcups) and achieve display effects by adjusting the material state or substance release in them; Microsphere pixels are display units made of tiny spherical particles, usually used to adjust the reflection or emission properties of light; Pixelated film is a display structure that displays pixels through thin film technology, usually tiny pixel units are arranged on a film substrate; Of course, a combination of at least two states can also be used, such as: Liquid crystal phase pixel + microarray: Combining the advantages of liquid crystal display and the high resolution of microarray, high-definition and fine display effects can be achieved, which is commonly seen in high-end display screens.

[0102] Microcapsule + solid pixel: used in flexible display and electronic paper technology, microcapsule can adjust the display effect according to external electrical signals, while solid pixel can provide higher brightness and stability.

[0103] Photonic crystal + liquid pixel: The introduction of photonic crystal can enhance the color range and contrast of the display, while liquid pixels are used to achieve dynamic display effects.

[0104] It should be noted that the size of quantum dots, pigment particles, and sub-pixels can be changed. In principle, reflective display can be achieved regardless of the size. Therefore, any quantum dot, pigment particle, or sub-pixel size should fall within the scope of protection of this patent. The change in the pixel arrangement does not affect the innovation and implementation effect of this patent and should still fall within the scope of protection of this patent; Changes in the number of sub-pixels and wavelengths, and pixels composed of sub-pixels of different numbers and wavelengths do not affect the effect of the quantum dot synergistic enhancement scheme on the final display effect, and should still fall within the scope of protection of this patent.

[0105] The specific examples are further described below: Example 1 A mixture of quantum dots whose fluorescence emission peaks are in the red, green, and blue bands and color particles whose reflection spectrum peak wavelengths are in the red, green, and blue bands Implementation steps: Quantum dot preparation: The emission peak of red quantum dots is in the 630nm band, the emission peak of green quantum dots is in the 530nm band, and the emission peak of blue quantum dots is in the 450nm band.

[0106] Pigment particle preparation: The peak wavelength of the reflection spectrum of the red pigment particles is located at 640 nm, the peak wavelength of the reflection spectrum of the green pigment particles is located at 540 nm, and the peak wavelength of the reflection spectrum of the blue pigment particles is located at 460 nm.

[0107] Mixing ratio: The mass ratio of quantum dots to pigment particles is 20:1; the specific operation is to mix the red, green and blue quantum dots with the corresponding pigment particles respectively in this ratio.

[0108] Combination method: The ligand exchange method is used to combine quantum dots and pigment particles, which makes the interface between quantum dots and pigment particles closer and enhances the synergistic effect.

[0109] Ink preparation: The final preparation is a coordinated coupling ink of red, green and blue, and each color ink is used together with black ink (black pigment particles are prepared separately).

[0110] Pixelation process: The pixelation process is used to prepare four sub-pixels of a pixel in the display device with red, green, blue and black inks respectively. The sizes of the sub-pixels are 100nm long, 100nm wide and 50nm thick respectively.

[0111] Display panel production: According to the conventional display panel production process, the synergistic color reflective display panel is integrated with the driving circuit, and a quantum dot synergistic color reflective display device is produced in combination with a side-entry excitation light source 7.

[0112] Conclusion: Through this embodiment, the mixing of quantum dots and pigment particles was successfully achieved, and the color saturation and brightness of the display panel were enhanced. The combination of red, green and blue quantum dots with pigment particles with similar reflection spectrum peaks can provide excellent display effects in strong light environments. Through the appropriate ratio (20:1) and ligand exchange binding method, the synergistic effect of quantum dots and pigment particles is ensured, and the display effect is more delicate and vivid.

[0113] Example 2 Using different mixing ratios of quantum dots and pigment particles Implementation steps: Quantum dot preparation: The red quantum dot emission peak is at 630nm, the green quantum dot emission peak is at 530nm, and the blue quantum dot emission peak is at 450nm.

[0114] Pigment particle preparation: The peak wavelength of the reflection spectrum of the red pigment particles is 640nm, the peak wavelength of the reflection spectrum of the green pigment particles is 540nm, and the peak wavelength of the reflection spectrum of the blue pigment particles is 460nm.

[0115] Mixing ratio: The mass ratio of quantum dots to pigment particles is 1:1; red, green, and blue quantum dots are mixed with corresponding pigment particles according to this ratio.

[0116] Combination method: In this embodiment, the quantum dots are coated on the surface of the pigment particles by a separate shell coating method to form a stable mixture.

[0117] Ink preparation: Red, green and blue synergistic coupling inks are prepared separately, and black pigment particles are prepared separately to form black ink.

[0118] Pixelation process: The four-color ink is prepared into four sub-pixels of one pixel in the display device using the pixelation process, and the sub-pixel size is 50nm long, 50nm wide, and 50nm thick.

[0119] Display panel production: According to the conventional display panel manufacturing process, the quantum dot synergistic color reflective display panel and the driving circuit are integrated, and a side-entry excitation light source 7 is adopted.

[0120] Conclusion: By adjusting the mixing ratio of quantum dots and pigment particles to 1:1, the brightness of the display is improved while maintaining good color performance. The use of a single shell coating method ensures a good combination of quantum dots and pigment particles, effectively improving the stability and uniformity of color. This embodiment provides a relatively balanced display effect for the quantum dot synergistic color reflective display device, which is suitable for a variety of display environments.

[0121] Example 3 Quantum dots with fluorescence emission peaks close to the reflection spectrum peaks are mixed with pigment particles Implementation steps: Quantum dot preparation: The red quantum dot emission peak is at 630nm, the green quantum dot emission peak is at 530nm, and the blue quantum dot emission peak is at 450nm.

[0122] Pigment particle preparation: The peak wavelength of the reflection spectrum of the red pigment particles is 640nm, the peak wavelength of the reflection spectrum of the green pigment particles is 540nm, and the peak wavelength of the reflection spectrum of the blue pigment particles is 460nm.

[0123] Mixing ratio: The mass ratio of quantum dots to pigment particles is 5:1; the specific operation is to mix the red, green and blue quantum dots with the corresponding pigment particles respectively in this ratio.

[0124] Combination method: Use ligand connection to connect quantum dots and pigment particles through ligand molecules to ensure the synergistic effect of the two.

[0125] Prepare ink: prepare red, green, blue cooperative coupling inks and black ink respectively.

[0126] Pixelation process: The four inks are prepared into four sub-pixels of one pixel of the display device using the pixelation process. The size of the sub-pixel is 100 nm in length, 100 nm in width, and 30 nm in thickness.

[0127] Display panel production: By using conventional display panel manufacturing technology, the quantum dot synergistic color reflective display panel and driving circuit are integrated, and equipped with a side-entry excitation light source 7.

[0128] Conclusion: The display effect of this embodiment is significantly improved by matching the peak of the reflection spectrum of quantum dots and pigment particles with the peak of fluorescence emission. The ligand connection and combination of quantum dots and pigment particles further enhances the stability and durability of the display effect; at the same time, by adjusting the mass ratio of quantum dots to pigment particles, the brightness and color of the display are ensured to be high quality, which is suitable for the application of high-precision display devices.

[0129] Example 4 Use a lower mixing ratio of quantum dots to pigment particles Implementation steps: Quantum dot preparation: Quantum dot preparation: The red quantum dot emission peak is at 630nm, the green quantum dot emission peak is at 530nm, and the blue quantum dot emission peak is at 450nm.

[0130] Pigment particle preparation: The peak wavelength of the reflection spectrum of the red pigment particles is 640nm, the peak wavelength of the reflection spectrum of the green pigment particles is 540nm, and the peak wavelength of the reflection spectrum of the blue pigment particles is 460nm.

[0131] Mixing ratio: The mass ratio of quantum dots to pigment particles is 1:10; the specific operation is to mix the red, green and blue quantum dots with the corresponding pigment particles respectively in this ratio.

[0132] Combination method: The reverse microemulsion combination method is used to mix quantum dots and pigment particles in the form of microemulsion.

[0133] Prepare ink: prepare red, green and blue coordinated coupling inks, and prepare black ink separately.

[0134] Pixelation process: The four-color ink is prepared into four sub-pixels of one pixel of the display device using the pixelation process. The size of the sub-pixel is 200nm long, 200nm wide, and 30nm thick.

[0135] Display panel production: Integrate quantum dot synergistic color reflective display panel and driving circuit according to conventional processes, and add a side-entry excitation light source 7.

[0136] Conclusion: By adopting a lower mixing ratio of quantum dots to pigment particles (1:10), although the proportion of quantum dots is reduced, the reflective properties of the pigment particles are enhanced, especially in the red and green bands; at the same time, although the contribution of quantum dots is relatively small, the reverse microemulsion combination method can effectively mix the two evenly, thereby improving the stability and optical performance of the system.

[0137] Although the ratio of quantum dots to pigment particles in this solution is low, it can still provide good color saturation and brightness, and the reflective properties of the pigment particles play a leading role in the overall display effect. The display panel uses an edge-entry excitation light source 7, which further enhances the display brightness and contrast. The overall display effect is balanced and suitable for low-cost, standard-level display products.

[0138] Example 5 Using a high ratio of quantum dots mixed with pigment particles Implementation steps: Quantum dot preparation: The emission peak of red quantum dots is at 630nm, the emission peak of green quantum dots is at 530nm, and the emission peak of blue quantum dots is at 450nm.

[0139] Pigment particle preparation: The peak wavelength of the reflection spectrum of the red pigment particles is 640nm, the peak wavelength of the reflection spectrum of the green pigment particles is 540nm, and the peak wavelength of the reflection spectrum of the blue pigment particles is 460nm.

[0140] Mixing ratio: The mass ratio of quantum dots to pigment particles is 20:1; the specific operation is to mix the red, green and blue quantum dots with the corresponding pigment particles respectively in this ratio.

[0141] Combination method: The quantum dots are combined with the pigment particles by ligand exchange method to ensure that the two are evenly dispersed and improve the stability and optical properties of the mixture.

[0142] Ink preparation: The mixed quantum dots and pigment particles are processed into red, green and blue synergistic coupling inks to ensure that each color of ink has excellent optical properties, and black ink is prepared separately.

[0143] Pixelation process: The four-color ink is made into four sub-pixels of one pixel in the display device using the pixelation process. The size of each sub-pixel is 150nm long, 150nm wide, and 30nm thick to meet the needs of high-resolution display.

[0144] Display panel production: According to the conventional display panel production process, the quantum dot synergistic color reflective display panel and driving circuit are integrated, and a flat backlight excitation light source is added to enhance the brightness and display effect.

[0145] Conclusion: In this embodiment, the use of a high quantum dot ratio enables quantum dots to play a greater role in enhancing the fluorescent luminescence characteristics. At the same time, due to the greatly increased ratio of quantum dots, the color saturation and brightness of the display panel are significantly improved. Although the ratio of pigment particles is low, its reflective properties still have a positive impact on the final display effect; Through the combination of ligand exchange methods, the synergistic effect between quantum dots and pigment particles is further enhanced, ensuring the stability of the material and the efficient collaboration of optical properties. The display effect of this solution has achieved a good balance in color reproduction, brightness and color consistency. It is suitable for display applications with high resolution, high brightness and high color accuracy requirements, and is particularly suitable for use in high-end display devices such as high-end TVs, displays and projectors.

[0146] Example 6 Mixing quantum dots and pigment particles in different proportions and multilayer structures Implementation steps: Quantum dot preparation: The red quantum dot emission peak is at 630nm, the green quantum dot emission peak is at 530nm, and the blue quantum dot emission peak is at 450nm.

[0147] Pigment particle preparation: The peak wavelength of the reflection spectrum of the red pigment particles is 640nm, the peak wavelength of the reflection spectrum of the green pigment particles is 540nm, and the peak wavelength of the reflection spectrum of the blue pigment particles is 460nm.

[0148] Mixing ratio: The quantum dots and pigment particles were mixed in three ratios of 10:1, 1:1 and 1:10, and the display effect of each ratio was tested respectively.

[0149] Combination method: To ensure stable mixing, the quantum dots and pigment particles are mixed using reverse microemulsion technology. The quantum dots and pigment particles wrap around each other in the process of forming the microemulsion, thus forming a stable structure.

[0150] Ink preparation: prepare red, green and blue coordinated coupling inks, and prepare black ink separately.

[0151] Pixelation process: The four-color ink is prepared into four sub-pixels of one pixel in the display device using the pixelation process. The size of the sub-pixel is 50nm long, 50nm wide, and 20nm thick.

[0152] Display panel production: According to the conventional display panel production process, the quantum dot synergistic color reflective display panel and driving circuit are integrated, and the flat-panel backlight excitation method is adopted.

[0153] Conclusion: This example studies the synergistic effect between quantum dots and pigment particles through different mixing ratios (10:1, 1:1, 1:10). The experiment shows that when the ratio of quantum dots to pigment particles is 10:1, the display brightness is the highest and the color is the most vivid, while the color is more balanced at the ratio of 1:1, which is suitable for a wider range of display needs. The reverse microemulsion technology is used to ensure the efficient combination and stability of quantum dots and pigment particles. This solution is suitable for high-end display devices that require brightness and color saturation.

[0154] Example 7 Quantum dots of different shapes combined with pigment particles Implementation steps: Quantum dot preparation: The red quantum dot emission peak is at 630nm, the green quantum dot emission peak is at 530nm, and the blue quantum dot emission peak is at 450nm.

[0155] Pigment particle preparation: The peak wavelength of the reflection spectrum of the red pigment particles is 640nm, the peak wavelength of the reflection spectrum of the green pigment particles is 540nm, and the peak wavelength of the reflection spectrum of the blue pigment particles is 460nm.

[0156] Mixing ratio: The mass ratio of quantum dots to pigment particles is 1:5.

[0157] Combination method: Quantum dots and pigment particles adopt integrated coating technology. Quantum dots and pigment particles are co-coated in a polymer shell layer to improve the stability of the combination.

[0158] Ink preparation: prepare red, green and blue cooperative coupling inks respectively, and prepare black ink separately.

[0159] Pixelation process: The four-color ink is prepared into four sub-pixels of one pixel in the display device using the pixelation process. The sub-pixel size is 120nm long, 120nm wide, and 40nm thick.

[0160] Display panel production: According to the conventional display panel production process, the quantum dot synergistic color reflective display panel and driving circuit are integrated, and the flat-panel light-emitting excitation method is adopted.

[0161] Conclusion: This embodiment uses integrated coating technology to efficiently combine quantum dots and pigment particles, improving the stability and uniformity of the display effect. Through the mixing ratio of quantum dots and pigment particles (1:5), the display effect is balanced, which is suitable for display devices with high requirements for color accuracy and brightness. Especially in the case of high reflectance spectrum matching, the display panel of this embodiment shows high color saturation and strong brightness, which is suitable for high-quality display applications. Example 8 Surface roughness of quantum dots mixed with pigment particles Implementation steps: Quantum dot preparation: The red quantum dot emission peak is at 630nm, the green quantum dot emission peak is at 530nm, and the blue quantum dot emission peak is at 450nm.

[0162] Pigment particle preparation: The peak wavelength of the reflection spectrum of the red pigment particles is 640nm, the peak wavelength of the reflection spectrum of the green pigment particles is 540nm, and the peak wavelength of the reflection spectrum of the blue pigment particles is 460nm.

[0163] Mixing ratio: The mass ratio of quantum dots to pigment particles is 1:3.

[0164] Binding method: Quantum dots and pigment particles are combined by ligand exchange.

[0165] Surface roughness adjustment: The surface roughness of quantum dots and pigment particles is adjusted to between 10nm and 50nm respectively to enhance the scattering and absorption of light and improve the brightness and contrast of the display.

[0166] Ink preparation: prepare red, green and blue coordinated coupling inks, and prepare black ink separately.

[0167] Pixelation process: The four-color ink is prepared into four sub-pixels of one pixel in the display device using the pixelation process. The size of the sub-pixel is 80nm in length, 80nm in width, and 30nm in thickness.

[0168] Display panel production: According to the conventional display panel production process, the quantum dot synergistic color reflective display panel and driving circuit are integrated, and the flat-panel backlight excitation method is adopted.

[0169] Conclusion: By increasing the surface roughness of quantum dots and pigment particles, the display effect of this embodiment is excellent in light scattering and absorption, and can improve the brightness and contrast of the display. The adjustment of the surface roughness brings better visual effects to the display panel, which is suitable for high contrast and high brightness display devices.

[0170] The present application also provides a display panel, comprising the array substrate as described above; It also includes: minimum pixel units 5 arranged in arrays at intervals along the first direction and the second direction, respectively. The minimum pixel units 5 can be arranged in arrays on the substrate, thereby achieving a good arrangement effect.

[0171] Of course, it also includes but is not limited to the following components: a reflective display device panel and a side-entry excitation light source 7 outside the display panel frame.

[0172] Specifically, by adopting conventional display panel manufacturing process to further manufacture quantum dot synergistic color reflective display panel and driving circuit, adding side-entry excitation light source (such as Figure 5 As shown, this figure only exemplifies the side-entry excitation method, and the excitation methods such as flat-panel backlight and flat-panel light emission should be protected within the scope of the present invention), that is, the quantum dot synergistic color reflective display device proposed by the present invention.

[0173] It should be noted that the addition or replacement of functional film materials and additive materials during the preparation of display panels does not affect the innovation and implementation effect of this patent and should still fall within the scope of protection of this patent. Changes in the excitation method of the excitation light source, such as, but not limited to, flat panel backlighting, flat panel luminescence, etc., should still fall within the scope of protection of this patent; Replacement of excitation light source materials and luminescent wavelengths. Since any light source material that can emit light will cause quantum dots to produce fluorescence and display effects, any luminescent light source of any material should fall within the scope of protection of this patent. Since quantum dot materials can absorb short-wavelength light and convert it into long-wavelength light for emission, any light source whose central luminescent wavelength is less than the maximum luminescent wavelength of the incorporated quantum dot material falls within the scope of protection of this patent.

[0174] The present application also provides a reflective display device, including the display panel as described above. The reflective display device using the electronic paper display module provided in this embodiment has the same basic principle and technical effects as the above embodiment. For parts not mentioned in this embodiment, please refer to the above corresponding contents.

[0175] This application also has the following beneficial effects: 1. The present invention proposes for the first time to combine quantum dots with pigment particles to achieve synergistic effect, and apply it to color reflective display devices; on the one hand, quantum dot materials have the advantages of better short-wavelength absorption, short-wavelength light can be converted into fluorescent light, and the half-peak width of fluorescent light is narrower (about 22nm); on the other hand, pigment particles have the advantage of better long-wavelength absorption, which can just make up for the shortcomings of quantum dots in this regard; optically: after the pigment particles are combined with quantum dot materials, the absorption of short-wavelength light of color reflective display devices can be improved, the light conversion ratio can be increased (increased brightness), the half-peak width can be narrowed (increased color gamut) and other effects can be achieved; dynamics: the coordinated movement of pigment particles + quantum dots can increase the overall specific surface area, carry more ligands, and have a higher charge potential, thereby improving the response speed of color reflective display devices 2. Apply quantum dots in color reflective displays to narrow the spectral emission, increase the color gamut, improve brightness, and increase the response frequency.

[0176] 3. While applying quantum dots, pigment particles are retained in color reflective displays to absorb long-wavelength illumination light that quantum dots cannot absorb, avoid huge deviations in the color of the light spectrum, narrow the half-peak width, and increase the color gamut.

[0177] 4. The application of quantum dots enables color reflective displays to be equipped with optional backlight excitation light sources to stimulate the fluorescence of quantum dots, thus compensating for the disadvantage of reflective displays having too low brightness in dark environments.

[0178] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. An array substrate, characterized in that: include: A substrate base plate (6); A first sub-pixel (1) is arranged on the base substrate (6); A second sub-pixel (2) is arranged along a first direction and spaced apart from the first sub-pixel (1); a third sub-pixel (3) arranged along the second direction and spaced apart from the first sub-pixel (1); and a fourth sub-pixel (4), arranged adjacent to and spaced from the second sub-pixel (2) and the third sub-pixel (3); Wherein, the first sub-pixel (1), the second sub-pixel (2), the third sub-pixel (3) and the fourth sub-pixel (4) are arranged in a preset direction to form a minimum pixel unit (5); The first sub-pixel (1), the second sub-pixel (2), the third sub-pixel (3) and the fourth sub-pixel (4) respectively contain quantum dots of a preset color and pigment particles matching the preset color.

2. The array substrate according to claim 1, characterized in that: The first sub-pixel (1) comprises: red quantum dots and red pigment particles, wherein the red quantum dots and the red pigment particles are mixed in a preset ratio to prepare a first cooperative coupling material for red display; The second sub-pixel (2) comprises: blue quantum dots and blue pigment particles, wherein the blue quantum dots and the blue pigment particles are mixed in a preset ratio to prepare a second cooperative coupling material for blue display; The third sub-pixel (3) comprises: black pigment particles; The fourth sub-pixel (4) comprises: green quantum dots and green pigment particles, and the green quantum dots and the green pigment particles are mixed in a preset ratio to prepare a fourth cooperative coupling material for green display.

3. The array substrate according to claim 1, characterized in that: The mixing mass ratio of the quantum dots to the pigment particles is in the range of 0:1-1:

0.

4. The array substrate according to claim 1, characterized in that: The first sub-pixel (1), the second sub-pixel (2), the third sub-pixel (3) and the fourth sub-pixel (4) have a length of 5nm-100mm, a width of 5nm-100mm and a thickness of 5nm-100mm.

5. The array substrate according to claim 1, characterized in that: The quantum dots and the pigment particles are in powder form or solution form; Among them, when the quantum dots and the pigment particles are solution solvents, the quantum dots and the pigment particles include: one or more mixed liquids of chloroform, toluene, chlorobenzene, alkanes, olefins, aromatic hydrocarbons, alcohols, ethyl acetate, halogenated alkanes, halogenated olefins, halogenated aromatic hydrocarbons, glycol derivatives, ketones, toluene, o-xylene, m-xylene, p-xylene, fluorocarbons, esters, tetrahydrofuran, petroleum ether, dimethyl sulfoxide, and water solvents.

6. The array substrate according to claim 1, characterized in that: The quantum dots also include: one or more quantum dot luminescent materials of different morphologies with a central emission wavelength of 350nm-1000nm, or a mixture of the quantum dots and a specified type of luminescent material; The quantum dots include: a quantum dot core and a shell material covering the quantum dot core, wherein the quantum dot core and the shell material are CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, Cu x In 1-x S, Cu x In 1-x Se y S 1-y 、Ag x In 1-x S, Ag x In 1-x Se y S 1-y 、InP、Cu x Zn 1-x Se, Zn x Mn 1-x Single-core nanoparticles of Se, PbS, PbSe, Cd alloy materials, In alloy materials, Zn alloy materials or perovskite materials; Alternatively, at least one layer of any one or a combination of at least two of CdSe, CdS, ZnO, ZnS, ZnSe, ZnTe or alloy materials is coated on the periphery of the shell material.

7. The array substrate according to claim 1, characterized in that: The pigment particles also include: pigment particles of different morphologies with one or more peak reflection wavelengths between 350nm and 1000nm, or a mixture of the pigment particles and a specific type with a high reflection spectrum; The pigment particles are any one of organic dyes, organic inks, inorganic dyes, inorganic inks, natural pigments, artificial synthetic pigments, graphite, metal oxides and particles of different morphologies thereof, metals and particles of different morphologies thereof, and SiO2, or a combination of at least two of them.

8. The array substrate according to claim 1, characterized in that: The states of the first sub-pixel (1), the second sub-pixel (2), the third sub-pixel (3) and the fourth sub-pixel (4) are any one of liquid pixels, solid pixels, gas pixels, liquid crystal phase pixels, photonic crystals, microarrays, capsules, microcapsules, microcups, microspheres or pixelated films, or a combination of at least two of the states.

9. A display panel, characterized in that An array substrate comprising any one of claims 1 to 8; It also includes: minimum pixel units (5) arranged in an array at intervals along the first direction and the second direction respectively.

10. A reflective display device, characterized in that: Comprising the display panel as claimed in claim 9.

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