Display panel

Abstract

The invention belongs to the technical field of display, and particularly relates to a display panel and a display module. The display panel comprises a substrate and a plurality of pixel units arranged on the substrate, each pixel unit comprises a light-emitting unit, a control electrode and a plurality of color resistance layers made of electrochromic materials, each color resistance layer has a transparent state and a color state, the light-emitting units are used for projecting light to the color resistance layers, and the control electrodes are used for controlling the light-emitting units to emit light to the color resistance layers. The control electrodes apply electric fields to the two ends of the color resistance layers so as to control the color resistance layers to be in a transparent state or a colored state, at least two color resistance layers are stacked in the preset direction, and the preset direction is perpendicular to the substrate. The color resistance layers can be stacked in the preset direction, so that the occupied area of the multiple color resistance layers is reduced, more pixel units can be arranged on a certain area, and then the pixel density of the display module is improved.

Description

Technical Field

[0001] The present invention belongs to the field of display technology, and in particular relates to a display panel. Background Art

[0002] As a new generation of display device backplane technology, OLED (Organic Light-Emitting Diode) has further market applications in the consumer market in recent years. Compared with LCD (Liquid Crystal Display), it has the advantages of wider operating temperature range, lower product thickness, brighter colors, faster response speed and higher contrast. At the same time, the OLED Array to TFE film layers are made through film printing technology, which has more diverse development potential. Different from LCD, OLED is EL (electroluminescent) material directly electroluminescent, and the host and guest luminescent materials and the hole injection layer, hole transport layer, electron transport layer, electron injection layer and other energy level functional layers are stacked and compounded between the cathode and the anode perpendicular to the display plane.

[0003] The structural process of OLED adopts a series of methods such as evaporation and deposition. Each sub-pixel is arranged on the same plane on the display plane. Usually, the three RGB sub-pixels are regarded as one pixel. When the required aperture ratio increases, the aperture ratio of the metal mask (Fine Metal Mask) in the key process technology increases accordingly. The influence of self-weight and temperature deformation in the process, especially in the process of large-size generation lines, increases accordingly. Moreover, the three RGB sub-pixels in the same pixel need to be spread out and arranged on the same plane, which leads to a limited number of pixels that can be arranged per unit area, and thus cannot meet the use requirements or scenarios of high pixel density. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a display panel, aiming to solve the problem of how to increase the pixel density of a display module.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, a display panel is provided, comprising: a base substrate and a plurality of pixel units arranged on the base substrate, each of the pixel units comprising a light-emitting unit, a control electrode and a plurality of color resist layers made of an electrochromic material, the color resist layers having a transparent state and a color state, the light-emitting unit being used to project light to each of the color resist layers, the control electrode applying an electric field at both ends of the color resist layer to control the color resist layer to be in the transparent state or in the color state, at least two of the color resist layers being stacked along a predetermined direction, and the predetermined direction being perpendicular to the base substrate.

[0007] In some embodiments, each of the pixel units includes three color-resistance layers, and the three color-resistance layers are stacked in sequence along the predetermined direction.

[0008] In some embodiments, each of the pixel units includes three color-resistance layers, and two of the color-resistance layers are stacked on one side of another color-resistance layer along the predetermined direction.

[0009] In some embodiments, the color of each color resist layer of each pixel unit is different, and the pixel unit at least includes a blue color resist layer, a green color resist layer, and a red color resist layer.

[0010] In some embodiments, the control electrode includes a plurality of first anode layers stacked in sequence along the predetermined direction and a plurality of first cathode layers stacked in sequence along the predetermined direction, each of the first anode layers is electrically connected to each of the color resist layers, and each of the first cathode layers is electrically connected to each of the color resist layers.

[0011] In some embodiments, the display panel also includes a plurality of first insulating isolation layers stacked in sequence along the predetermined direction, the two ends of any color resist layer are respectively electrically connected to a first anode layer and a first cathode layer and are arranged in a group, and the color resist layer, the first anode layer and the first cathode layer in the same group are arranged in the same first insulating isolation layer.

[0012] In some embodiments, the control electrode further includes a second anode layer and a second cathode layer, the second anode layer is disposed on one side of each color resist layer, and the second cathode layer is disposed between two stacked color resist layers and another color resist layer.

[0013] In some embodiments, the refractive index of each of the stacked color resist layers increases sequentially along the predetermined direction.

[0014] In some embodiments, the display panel further includes a second insulating isolation layer arranged along the predetermined direction, and the second insulating isolation layer is disposed between any two adjacent pixel units.

[0015] In some embodiments, the display panel further includes a pixel definition layer disposed on the base substrate, a plurality of openings are disposed in a display area of ​​the pixel definition layer, and the light emitting units are disposed in the openings.

[0016] The beneficial effect of the present application is that the display panel provided in the present embodiment includes a plurality of pixel units, the pixel units include a plurality of color resist layers, and at least two color resist layers can be stacked along a predetermined direction, thereby reducing the occupied area of ​​the color resist layers, so that more pixel units can be arranged on a certain area, thereby improving the pixel density of the display module, and also improving the space utilization, so that a higher resolution can be achieved within the same area, and the image quality and visual effect of the display module are optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic diagram of the structure of a display module provided in an embodiment of the present application;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of a display panel of a display module;

[0020] Figure 3 is a schematic diagram of the principle of different arrangements of multiple color resist layers provided by another embodiment;

[0021] Figure 4 is a schematic diagram of the principle of lighting different color resist layers provided by another embodiment;

[0022] Figure 5 is a schematic diagram of the principles of multiple pixel units provided in another embodiment of the present application;

[0023] Figure 6 is a schematic diagram of the principle that the refractive indexes of multiple color resist layers provided by another embodiment are sequentially reduced along a predetermined direction;

[0024] Figure 7 It is a schematic diagram showing the principle that the refractive index of multiple color resist layers increases sequentially along a predetermined direction, provided by another embodiment.

[0025] Among them, the reference numerals in the figure are:

[0026] 100, display panel; 200, light-emitting unit; 21, first anode layer; 22, first cathode layer; 10, pixel unit; 11, color resistance layer; 24, insulating encapsulation layer; 101, light incident side; 102, display side; 31, first insulating isolation layer; 32, second insulating isolation layer; 221, second anode layer; 222, second cathode layer; 204, substrate; 205, pixel definition layer; DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present application.

[0028] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first" and "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] See also Figure 1 to Figure 2 The embodiment of the present application provides a display panel 100 , which can cooperate with a light-emitting unit 200 , and the light-emitting unit 200 can project white light to the display panel 100 .

[0030] See also Figure 1 to Figure 2 The display panel 100 has a light incident side 101 and a display side 102 disposed opposite to the light incident side 101. For ease of description, in this embodiment, the light incident side 101 is located below the display side 102. The display panel 100 includes: a base substrate 204 and a plurality of pixel units 10 arranged on the base substrate 204. In this embodiment, the base substrate 204 is arranged horizontally, and the plurality of pixel units 10 are arranged horizontally and spaced apart from each other on the base substrate 204. The light incident side 101 is on the same side as the base substrate 204, and the display side 102 is located above the base substrate 204.

[0031] The pixel unit 10 includes a light-emitting unit, a control electrode, and a color resist layer 11 made of an electrochromic material. The color resist layer 11 has a transparent state and a colored state. The light-emitting unit is used to project light to each of the color resist layers 11. The control electrode applies an electric field at both ends of the color resist layer 11 to control the color resist layer 11 to be in a transparent state or a colored state. It can be understood that the control electrode can apply an electric field at both ends of the color resist layer 11, and changing the electric field applied to the color resist layer 11 can make the color resist layer 11 change from a transparent state to a colored state, or from a colored state to a transparent state. For example, when the voltage of the electric field decreases, the color resist layer 11 changes to a transparent state, and when the voltage of the electric field increases, the color resist layer 11 changes to a colored state. When the color resist layer 11 is in a transparent state, light can be allowed to pass through; when the color resist layer 11 is in a colored state, the color resist layer 11 has a filtering effect on light of a specific wavelength band, so that the color of the light of the wavelength band can be presented, thereby realizing a display effect based on electrochromic materials with different characteristics. Of course, when the color resist layer 11 is in a colored state, it also has a certain transmittance to light.

[0032] See also Figure 1 to Figure 2 A plurality of color resist layers 11 are provided, and at least two color resist layers 11 are stacked along a predetermined direction, the predetermined direction is directed along the light incident side 101 toward the display side 102 , or the predetermined direction is perpendicular to the base substrate 204 and upward.

[0033] See also Figure 1 to Figure 2 The display panel 100 provided in this embodiment includes a plurality of pixel units 10, and the pixel units 10 include a plurality of color resist layers 11, and at least two color resist layers 11 can be stacked along a predetermined direction, thereby reducing the occupied area of ​​the color resist layer 11, so that more pixel units 10 can be arranged on a certain area, thereby improving the pixel density of the display module, and also improving the space utilization, so that a higher resolution can be achieved within the same area, and the image quality and visual effect of the display module are optimized.

[0034] Optionally, an electrochromic material refers to a material whose optical properties (transmittance, absorptivity, reflectivity) etc. can undergo a stable and reversible color change under the action of an external electric field.

[0035] According to the different types of compounds, electrochromic materials can be divided into four categories:

[0036] Category 1: Transition metal oxides, such as WO3 (tungsten trioxide), V2O5 (vanadium pentoxide), NiO (nickel oxide), etc.

[0037] The second category: metal coordination complexes, among which the most commonly used is Prussian blue (PB), such as Fe 4[Fe(CN)6]3 (ferric ferrocyanide) and CoFe(CN)6 (cobalt ferrocyanide);

[0038] Category III: organic monomer compounds, such as bipyridine, viologen and their derivatives;

[0039] The fourth category is organic conductive polymers, such as polythiophene, polypyrrole, polyfuran, etc.

[0040] Prussian blue and heteropolyacids are relatively mature electrochromic materials used in smart switches. Among them, PB in metal coordination complexes has great potential in the development of electrochromic materials. Prussian blue has rich electrochromic properties and exhibits excellent electrochromic stability in the colorless state (ES) and sky blue state (PB), which is favored by people.

[0041] See also Figure 3 (a), in some embodiments, each of the pixel units includes three color resist layers 11, and the three color resist layers 11 are stacked in sequence along a predetermined direction.

[0042] Optionally, the three color resist layers 11 are stacked in sequence along a predetermined direction, so that the overall layout area of ​​the pixel unit 10 can be reduced, and more pixel units 10 can be arranged within a certain area, effectively improving the pixel density.

[0043] See also Figure 3 (b)-(d), in some embodiments, each of the pixel units includes three color resist layers 11, and two color resist layers 11 are stacked on one side of another color resist layer 11 along a predetermined direction, so that the overall layout area of ​​the pixel unit 10 can be reduced to a certain extent, and more pixel units 10 can be arranged within a certain area, effectively improving the pixel density. Moreover, the height of the color resist layer 11 located on one side and arranged separately is equal to the sum of the heights of the other two stacked color resist layers 11, and the color resist layer 11 located on one side can allow light to directly enter, and the outgoing light is not blocked, thereby improving the display effect of the corresponding color, and improving the color purity and picture clarity of the display.

[0044] See also Figure 1 to Figure 2 In some embodiments, the color states of the color resist layers 11 of each pixel unit are different, and each pixel unit 10 includes at least a blue color resist layer, a green color resist layer, and a red color resist layer.

[0045] In this embodiment, the pixel unit includes three color resist layers 11, and the three color resist layers 11 are respectively a blue color resist layer, a green color resist layer and a red color resist layer. In other embodiments, the three color resist layers 11 can be selected according to actual conditions and are not limited here.

[0046] Optionally, the R, G, and B color resist layers 11 are integrated in the same area by stacking, and are coaxially distributed in a direction perpendicular to the normal of the display screen, so that the original multi-pixel plane distribution is transformed into a vertical stacking distribution of unit sub-pixel groups, which greatly saves the layout space of the panel, significantly reduces the occupied area of ​​each pixel unit 10, and improves the effective pixel density.

[0047] Optionally, the blue color resist layer, the green color resist layer and the red color resist layer can realize the conversion between the color state and the transparent state by changing the electric field applied at both ends thereof, and realize the filtering of light of different wavelengths, which has the characteristics of electrochromism, and each color resist layer 11 also has a certain transmittance in the color state. Organic conductive polymers can be doped in Prussian blue to realize the preparation of the blue color resist layer, the green color resist layer and the red color resist layer.

[0048] See also Figure 1 to Figure 2 In some embodiments, the control electrode includes a plurality of first anode layers 21 stacked in sequence along a predetermined direction and a plurality of first cathode layers 22 stacked in sequence along a predetermined direction, each first anode layer 21 is electrically connected to each color resist layer 11, and each first cathode layer 22 is electrically connected to each color resist layer 11.

[0049] Optionally, multiple first anode layers 21 and multiple first cathode layers 22 are stacked in a predetermined direction and electrically connected to each color resist layer 11, so that an independent electric field is applied to each color resist layer 11, so that the electrochromic control of each color resist layer 11 is more precise. The display state of each color resist layer 11 is independent of other color resist layers 11, so that the display module can still achieve stable color output under complex electric field conditions.

[0050] See also Figure 2 The first anode layer 21' and the first cathode layer 22' control the individual color change of the B color resist layer, the first anode layer 21" and the first cathode layer 22" control the individual color change of the R color resist layer, and the first anode layer 21"' and the first cathode layer 22"' control the individual color change of the G color resist layer.

[0051] See also Figure 2 It can also be understood that the first anode layer 21', the first anode layer 21" and the first anode layer 21"' can be used as common electrodes to control the independent color change of the B, R, and G color resist layers by separately changing the voltages of the first cathode layer 22', the first cathode layer 22" and the first cathode layer 22"'.

[0052] It is understandable that the first anode layer 21 is connected to the anode of the power supply, and the first cathode layer 22 is connected to the cathode of the power supply. Multiple first cathode layers 22 and multiple first anode layers 21 can be deposited or etched at both ends of the color resist layer 11 by processes such as PVD, so as to facilitate the application of an effective electric field to each color resist layer 11, thereby realizing the electrochromic function of the color resist layer 11.

[0053] See also Figure 1 to Figure 2 In some embodiments, the display panel 100 further includes a plurality of first insulating isolation layers 31 stacked in sequence along a predetermined direction, the two ends of any color resist layer 11 are respectively electrically connected to a first anode layer 21 and a first cathode layer 22 and are arranged in a group, and the color resist layer 11, the first anode layer 21 and the first cathode layer 22 in the same group are arranged on the same first insulating isolation layer 31.

[0054] Optionally, the first insulating isolation layer 31 is made of a light-transmitting material, and its material may be polyimide. The first insulating isolation layer 31 can be used to isolate the color resist layers 11 from each other, and realize the independent packaging of the color resist layers 11 to prevent the invasion of external water vapor, and can also insulate the first anode layers 21 and the first cathode layers 22 from each other to prevent circuit interference.

[0055] At the same time, considering that the refractive index of the electrochromic material is different in the fully transparent state, in order to achieve high transmittance, PI (polyimide) materials with different refractive indices can be used for refractive index matching to achieve the highest light extraction efficiency. For example, the refractive index of the first insulating isolation layer 31 is the same as the refractive index of the color resist layer 11 located above it, so that after the light is emitted from the next color resist layer 11, it can smoothly pass through the first insulating isolation layer 31 above and enter the other color resist layer 11 above, thereby improving the transmission efficiency of the light.

[0056] See also Figure 1 to Figure 2 In some embodiments, the refractive index of each color resist layer 11 increases sequentially along a predetermined direction.

[0057] Taking into account the different refractive indices of the electrochromic material in the fully transparent state, in order to achieve high transmittance, the first insulating isolation layer 31 with different refractive indices and the electrochromic material can be used to match the refractive indices to achieve the highest light extraction efficiency. When there is a large-angle incident light, when the optically dense medium enters the optically sparse medium, the total reflection angle θ=arcsin(n2 / n1), n1 is the refractive index of the optically dense medium, and n2 is the refractive index of the optically sparse medium. It can be seen that from the light extraction direction, increasing the refractive index of the optically sparse medium, or reducing the refractive index of the optically dense medium, or changing both at the same time, can effectively increase the total reflection angle θ, so that more light is not totally reflected and propagates to the outside of the packaging layer, that is, emitted from the display side 102, thereby improving the light extraction efficiency.

[0058] Figure 6 to Figure 7, a method of adjusting the light extraction efficiency by changing the refractive index is given. Figure 6 In the embodiment, along the predetermined direction, the refractive index of each color-resist layer 11 decreases in sequence, so that total interfacial reflection occurs on the intermediate color-resist layer 11. Figure 6 In the structure, the refractive index of each color resist layer 11 increases sequentially along a predetermined direction, thereby preventing the light from being totally reflected at the interface between two adjacent color resist layers 11, thereby improving the light transmission efficiency and the light extraction efficiency.

[0059] See also Figure 1 to Figure 2 In some embodiments, both the light incident side 101 and the display side 102 are provided with a first insulating isolation layer 31 .

[0060] Optionally, a first insulating isolation layer 31 is provided on both the light incident side 101 and the display side 102, which can provide more comprehensive electrical protection, prevent external electric fields and electromagnetic waves from interfering with the color resistance layer 11, and protect it from external environmental factors (such as humidity, dust, etc.), thereby extending the service life.

[0061] See also Figure 5 In some embodiments, the display panel 100 further includes a second insulating isolation layer 32 arranged along a predetermined direction, and a second insulating isolation layer 32 is disposed between any two adjacent pixel units 10 .

[0062] See also Figure 5 Optionally, the second insulating isolation layer 32 may also be made of a light-transmitting and insulating material, and its material may also be polyimide.

[0063] See also Figure 5 Optionally, by providing a second insulating isolation layer 32 between adjacent pixel units 10, the independence and isolation between the pixel units 10 are further enhanced. This arrangement prevents electrical interference between different pixel units 10, ensures that each pixel unit 10 can work independently and stably, thereby improving the accuracy and reliability of the display panel 100.

[0064] See also Figure 3 In some embodiments, the control electrode further includes a second anode layer 221 and a second cathode layer 222 , a second anode layer 221 is disposed on one side of each color resist layer 11 , and a second cathode layer 222 is disposed between two stacked color resist layers 11 and another color resist layer 11 .

[0065] It can be understood that each second anode layer 221 is electrically connected to the corresponding color resist layer 11 , and each color resist layer 11 is electrically connected to the second cathode layer 222 , so that each color resist layer 11 is arranged in a common cathode.

[0066] Optionally, along a predetermined direction or along the incident direction of light, the three color resist layers 11 are sequentially a green color resist layer, a red color resist layer and a blue color resist layer. In other embodiments, they may be arranged in a different order, which is not limited here and can be selected according to actual conditions.

[0067] See also Figure 3 (b) Optionally, the R and B color resist layers 11 are stacked, the G color resist layer 11 is arranged around, and a second cathode layer 222 is provided between the stacked R and B color resist layers 11 and the G color resist layer 11 .

[0068] See also Figure 3 (c) Optionally, the R and G color resist layers 11 are stacked, the B color resist layer 11 is arranged around, and a second cathode layer 222 is provided between the stacked R and G color resist layers 11 and the B color resist layer 11 .

[0069] See also Figure 3 (d) Optionally, the G and B color resist layers 11 are stacked, the R color resist layer 11 is arranged around, and a second cathode layer 222 is provided between the stacked G and B color resist layers 11 and the R color resist layer 11 .

[0070] It can be understood that a green color resist layer, a red color resist layer and a blue color resist layer made of electrochromic materials are stacked in sequence above the light-emitting unit 200. By changing the electric field applied to both ends of the corresponding color resist layer 11, the filtering effect of the doped electrochromic material on light of a specific wavelength band is changed, so as to achieve a display effect based on electrochromic materials with different characteristics, and finally achieve the display purpose.

[0071] See also Figure 1 and Figure 5 In some embodiments, the display panel further includes a pixel definition layer 205 disposed on the base substrate 204, a plurality of openings are disposed in a display area of ​​the pixel definition layer 205, and the light emitting unit is disposed in the opening.

[0072] See also Figure 1 and Figure 5 The light-emitting unit includes a white light OLED, an anode 201 and a cathode 202. The anode 201 and the cathode 202 are used to electrically connect the white light OLED to a power source, thereby driving the white light OLED to emit light. Each color resist layer of the pixel unit corresponds to the light-emitting unit, and the projection of the control electrode on the base substrate 204 corresponds to the projection of the pixel definition layer 205 on the base substrate 204, that is, the projection of the control electrode is located on the pixel definition layer 205, so as not to affect the light output.

[0073] The light-emitting unit 200 is stacked using top emission, wherein the circuit adopts a common cathode solution. To ensure process packaging and insulation, the surface of the light-emitting unit 200 facing the light-incident side 101 adopts a SiNx (silicon nitride) structure as an insulating packaging layer 24. In other embodiments, considering light extraction efficiency and packaging reliability, a composite structure including but not limited to SiOx (silicon oxide), LiF (lithium fluoride), CPL (capping layer) or other one or more layers may also be used for packaging.

[0074] Optionally, considering that the stacked filtering process applies the subtractive color principle, the RGB three colors cannot form the required color through the subtractive color method, and the embodiment of the present application provides a light-emitting strategy.

[0075] See also Figure 4 (a), when white light is displayed alone, all the color-resistance layers 11 are not turned on. At this time, all the color-resistance layers 11 are converted to a transparent state, and white light passes through each color-resistance layer 11 in turn.

[0076] See also Figure 4 (b) When the blue color resist layer needs to be displayed alone, only the blue color resist layer is turned on, that is, the blue color resist layer is converted to a color state. At this time, the blue color resist layer transmits light of a specific wavelength band, and the red color resist layer and the green color resist layer remain transparent.

[0077] See also Figure 4 (c) When the red color resist layer needs to be displayed alone, only the red color resist layer is turned on, that is, the red color resist layer is converted to a color state. At this time, the red color resist layer transmits light of a specific wavelength band, and the blue color resist layer and the green color resist layer remain transparent.

[0078] See also Figure 4 (d) When the green color resist layer needs to be displayed alone, only the green color resist layer is turned on, that is, the green color resist layer is converted to a color state. At this time, the green color resist layer transmits light of a specific wavelength band, and the red color resist layer and the blue color resist layer remain transparent.

[0079] When displaying a picture with mixed colors, the grayscale data of the three channels of RGB are extracted separately, and the display timing of the three channels of R, G, and B are divided in a certain order to make them independent of each other, so that only one channel transmits light in a period of time. Due to the visual persistence effect of the human eye, the complete color pattern can be observed under high-speed refresh.

[0080] The pixels and sub-pixels described in this application represent different structural objects. Generally, a pixel is a structural unit of a panel for allocating basic color pixel blocks of a color image, and is usually composed of a group of at least one red, green, and blue sub-pixel, referred to as R, G, and B color resistance layers 11 in this application, which are used to receive red, green, and blue three-channel grayscale data of the image, respectively. Generally, if there is no special SPR rendering algorithm, a pixel is logically composed of a group of RGB (1:1:1).

[0081] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A display panel, characterized in that: include: A base substrate and a plurality of pixel units arranged on the base substrate, each of the pixel units includes a light-emitting unit, a control electrode and a plurality of color resist layers made of electrochromic material, the color resist layers have a transparent state and a color state, the light-emitting unit is used to project light to each of the color resist layers, the control electrode applies an electric field at both ends of the color resist layer to control the color resist layer to be in the transparent state or in the color state, at least two of the color resist layers are stacked along a predetermined direction, and the predetermined direction is perpendicular to the base substrate.

2. The display panel according to claim 1, wherein: Each of the pixel units includes three color-resistance layers, and the three color-resistance layers are stacked in sequence along the predetermined direction.

3. The display panel according to claim 1, wherein: Each of the pixel units includes three color-resistance layers, and two of the color-resistance layers are stacked on one side of another color-resistance layer along the predetermined direction.

4. The display panel according to any one of claims 1 to 3, characterized in that: The color resist layers of each pixel unit have different colors, and each pixel unit at least includes a blue color resist layer, a green color resist layer and a red color resist layer.

5. The display panel according to any one of claims 1 to 2, characterized in that: The control electrode includes a plurality of first anode layers stacked in sequence along the predetermined direction and a plurality of first cathode layers stacked in sequence along the predetermined direction, each of the first anode layers is electrically connected to each of the color resist layers, and each of the first cathode layers is electrically connected to each of the color resist layers.

6. The display panel according to claim 5, wherein: The display panel also includes a plurality of first insulating isolation layers stacked in sequence along the predetermined direction, the two ends of any color resist layer are respectively electrically connected to a first anode layer and a first cathode layer and are arranged in a group, and the color resist layer, the first anode layer and the first cathode layer in the same group are arranged on the same first insulating isolation layer.

7. The display panel according to claim 3, wherein: The control electrode further includes a second anode layer and a second cathode layer. The second anode layer is disposed on one side of each color resist layer, and the second cathode layer is disposed between two stacked color resist layers and another color resist layer.

8. The display panel according to any one of claims 1 to 3, characterized in that: The refractive index of each of the stacked color resist layers increases sequentially along the predetermined direction.

9. The display panel according to any one of claims 1 to 3, characterized in that: The display panel further includes a second insulating isolation layer arranged along the predetermined direction, and the second insulating isolation layer is disposed between any two adjacent pixel units.

10. The display panel according to any one of claims 1 to 3, characterized in that: The display panel further comprises a pixel definition layer disposed on the base substrate, a plurality of openings are disposed in a display area of ​​the pixel definition layer, and the light emitting units are disposed in the openings.

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