Display panel, preparation method of display panel and display device

Abstract

The invention provides a display panel, a preparation method of the display panel and a display device, the display panel comprises a substrate, a first electrode layer, a pixel limiting layer, a light emitting layer, a shading layer, a reflection control layer and an optical adjustment layer which are arranged in sequence, and the light emitting layer is located in a first opening of the pixel limiting layer; the shading layer comprises a plurality of shading parts; the first part of the reflection control layer is partially overlapped with the light-emitting layer, and the second part is partially overlapped with the shading part; the distance between the first surface of the first part in the thickness direction of the display panel and the first electrode layer is a first distance, the distance between the third surface of the second part in the thickness direction of the display panel and the first electrode layer is a second distance, and the first distance is smaller than the second distance. The second part of the reflection control layer of the display panel protrudes to form a low-refractive-index optical adjustment layer part, so that the manufacturing process of the low-refractive-index optical adjustment layer is reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular, to a display panel, a method for preparing a display panel, and a display device. Background Art

[0002] With the rapid development of display panel technology, organic light-emitting display panels have become a research hotspot due to their advantages such as fast response speed, high brightness, wide viewing angle and low power consumption. Generally speaking, in order to reduce the reflectivity of external light in the organic light-emitting diode display, a color filter or a reflection control layer is generally set on the light-emitting surface of the organic light-emitting diode display. This setting is better able to reduce the effect of ambient light reflection in the organic light-emitting diode display and improve the light-emitting effect of the organic light-emitting diode display. In order to improve the light-emitting efficiency of the display panel, a light adjustment layer is further provided to adjust the angle of the outgoing light to improve the light-emitting efficiency of the organic light-emitting display panel. However, the reflection control layer and the light adjustment layer are usually prepared by different preparation processes, and the preparation process is complicated, which can easily lead to serious losses in yield and production capacity. Summary of the invention

[0003] The main purpose of the present application is to provide a display panel, a method for manufacturing a display panel and a display device, so as to at least solve the problem that the manufacturing process of the existing organic light-emitting display device is relatively complicated and the light efficiency is relatively poor.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a display panel is provided, comprising: a substrate; a first electrode layer, located on one side of the substrate; a pixel defining layer, located on the side of the first electrode layer away from the substrate, the pixel defining layer comprising a plurality of first openings; a light-emitting layer, at least partially located in the first opening; a light-shielding layer, located on the side of the light-emitting layer away from the substrate, the light-shielding layer comprising a plurality of second openings and a light-shielding portion, the orthographic projection of the first opening on the substrate at least partially overlaps the orthographic projection of the second opening on the substrate, and the light-shielding portion is provided between two adjacent second openings; a reflection control layer, located on the side of the light-shielding layer away from the substrate, the reflection control layer comprising a first portion and a second portion, the first portion and the light-emitting layer on the substrate The orthographic projection of the second portion on the display panel at least partially overlaps, and the second portion at least partially overlaps with the orthographic projection of the shading portion on the substrate; an optical adjustment layer is located on the side of the reflection control layer away from the substrate; wherein the first portion has a first surface and a second surface relative to each other in the thickness direction of the display panel, the first surface is located on the side of the second surface away from the substrate, and the first surface and the second surface are both parallel to the substrate; the second portion has a third surface and a fourth surface relative to each other in the thickness direction of the display panel, and the third surface is located on the side of the fourth surface away from the substrate; the distance between the first surface and the first electrode layer is a first distance, the distance between the third surface and the first electrode layer is a second distance, and the first distance is smaller than the second distance.

[0005] According to another aspect of the present application, there is provided a method for preparing a display panel according to any one of the items, the method comprising: providing a substrate; sequentially forming a first electrode layer, a pixel defining layer, a light emitting layer, a light shielding layer, a reflection control layer and an optical adjustment layer on the substrate, the light shielding layer comprising a plurality of second openings and light shielding portions, the light shielding portion being provided between two adjacent second openings; wherein, a half-tone mask is used to expose the reflection control layer to be formed, the half-tone mask comprising a first light-transmitting portion and a second light-transmitting portion, the transmittance of the first light-transmitting portion is different from the transmittance of the second light-transmitting portion, and the orthographic projection of the first light-transmitting portion on the substrate coincides with the region where the first part of the reflection control layer is to be formed, and the orthographic projection of the second light-transmitting portion on the substrate coincides with the region where the second part of the reflection control layer is to be formed, or, the thickness of the light shielding layer is controlled to be 2 to 3 um, the light shielding layer is exposed and developed to form the light shielding portion, and the reflection control layer is directly coated on the light shielding portion so that the second part of the reflection control layer is a structure protruding from the first part.

[0006] According to another aspect of the present application, a display device is provided, comprising any one of the display panels described.

[0007] According to the technical solution of the present application, the reflection control layer of the display panel includes a first part and a second part, the first part overlaps at least partially with the orthographic projection of the light-emitting layer on the substrate, and the second part overlaps at least partially with the orthographic projection of the light-shielding portion on the substrate, wherein the first part has a first surface and a second surface opposite to each other in the thickness direction of the display panel, the first surface is located on the side of the second surface away from the substrate, and the first surface and the second surface are parallel to the substrate; the second part has a third surface and a fourth surface opposite to each other in the thickness direction of the display panel, the third surface is located on the side of the fourth surface away from the substrate; the distance between the first surface and the first electrode layer is a first distance, the distance between the third surface and the first electrode layer is a second distance, and the first distance is less than the second distance. That is, the light-shielding portion of the display panel is set as a convex structure, and the thickness of the light-shielding portion is increased, so that in the preparation process, the reflection control layer is directly prepared into a convex shape, and the convex portion is used as a low refractive index layer, which can save a process of making a low refractive index layer, reduce the process, and solve the problem that the process of the existing organic light-emitting display device is complicated and the light efficiency is poor. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0009] Figure 1 A schematic structural diagram of a display panel provided in an embodiment of the present application is shown;

[0010] Figure 2 A schematic diagram showing the structure of another display panel provided in an embodiment of the present application is shown;

[0011] Figure 3 A schematic diagram showing the structure of another display panel provided in an embodiment of the present application is shown;

[0012] Figure 4 A schematic diagram showing the structure of another display panel provided in an embodiment of the present application is shown;

[0013] Figure 5 A schematic diagram showing the angle of a transition surface of a reflection control layer of a display panel provided in an embodiment of the present application is shown;

[0014] Figure 6 A schematic diagram showing the structure of another display panel provided in an embodiment of the present application is shown;

[0015] Figure 7A logical schematic diagram of a method for preparing a display panel provided in an embodiment of the present application is shown;

[0016] Figure 8 A schematic structural diagram of a substrate of a display panel provided in an embodiment of the present application is shown;

[0017] Fig. 9 Shown in Figure 8 A schematic diagram of a cross-sectional structure of a substrate after a first electrode layer, a pixel defining layer, a light-emitting layer, and a common electrode are sequentially formed on a substrate;

[0018] Fig.10 Shown in Fig. 9 A schematic diagram of a cross-sectional structure of a substrate after an encapsulation layer, a touch sensing layer, a light shielding portion, and a reflection control layer are sequentially formed on a substrate;

[0019] Fig.11 A schematic structural diagram of a display device provided in an embodiment of the present application is shown.

[0020] The above drawings include the following reference numerals:

[0021] 10. substrate; 21. first electrode layer; 22. light-emitting layer; 23. common electrode; 30. pixel defining layer; 40. light-shielding portion; 50. reflection control layer; 60. optical adjustment layer; 70. encapsulation layer; 80. touch sensing layer; 81. protection layer; 82. second touch insulating layer; 83. first touch insulating layer; 84. first touch electrode; 85. second touch electrode; 90. insulating layer; 100. covering layer; 108. driving circuit layer; 400. display panel; 500. half-tone mask. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] Figure 1 is a schematic diagram of the structure of a display panel according to an embodiment of the present application. Figure 1 As shown, the display panel includes: a substrate 10; a first electrode layer 21, located on one side of the substrate 10; a pixel defining layer 30, located on the side of the first electrode layer 21 away from the substrate 10, the pixel defining layer 30 includes a plurality of first openings; a light-emitting layer 22, at least partially located in the first opening; a light-shielding layer, located on the side of the light-emitting layer away from the substrate 10, the light-shielding layer includes a plurality of second openings and a light-shielding portion 40, the orthographic projection of the first opening on the substrate 10 and the orthographic projection of the second opening on the substrate 10 at least partially overlap, and a light-shielding portion is provided between two adjacent second openings; a reflection control layer 50, located on the side of the light-shielding layer away from the substrate 10, the reflection control layer 50 includes a first portion and a second portion, the first portion and the orthographic projection of the light-emitting layer 22 on the substrate 10 overlap At least partially overlap, and the second part at least partially overlaps with the orthographic projection of the shading portion 40 on the substrate 10; the optical adjustment layer 60 is located on the side of the reflection control layer 50 away from the substrate 10; wherein the first part has a first surface and a second surface relative to each other in the thickness direction of the display panel, the first surface is located on the side of the second surface away from the substrate 10, and the first surface and the second surface are both parallel to the substrate 10; the second part has a third surface and a fourth surface relative to each other in the thickness direction of the display panel, and the third surface is located on the side of the fourth surface away from the substrate 10; the distance between the first surface and the first electrode layer 21 is a first distance d1, and the distance between the third surface and the first electrode layer 21 is a second distance d2, and the first distance d1 is less than the second distance d2.

[0027] As mentioned in the background technology, in order to reduce the reflectivity of external light in the organic light emitting diode display, a color filter or a reflection control layer is generally set on the light emitting surface of the organic light emitting diode display. This setting is more effective in reducing the effect of ambient light reflection in the organic light emitting diode display and improving the light emitting effect of the organic light emitting diode display. In order to improve the light emitting efficiency of the display panel, a light adjustment layer is further provided to adjust the angle of the emitted light to improve the light emitting efficiency of the organic light emitting display panel. Among them, the optical adjustment layer is generally a micro lens array (MLP).

[0028] However, since the reflection control layer, the first optical adjustment layer and the second optical adjustment layer are usually prepared by different preparation processes, the preparation process is complicated, which may easily lead to serious loss of yield and production capacity.

[0029] In the above embodiment, the shading portion is set as a convex structure, that is, by adjusting the thickness of the shading portion, the reflection control layer is directly prepared into a convex shape during the preparation process, and the convex portion is directly used as the low refractive index layer. In this way, it is no longer necessary to prepare a first optical adjustment layer with a low refractive index, saving a process for preparing a low refractive index layer, reducing the process, and solving the problem that the existing organic light-emitting display device has a complex process and poor light efficiency.

[0030] In addition, in the above embodiments, the substrate can be a rigid substrate, such as a glass substrate, or a flexible substrate, such as a polyimide substrate. The material of the substrate can be selected according to actual design requirements, and the embodiments of the present invention do not specifically limit it. The substrate is usually provided on the entire surface, and part of it is located in the display area of ​​the display panel.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, a first electrode layer 21 and a light-emitting layer 22 are provided on one side of the substrate 10, and the light-emitting layer is used to realize the display effect of the display panel. The light-emitting element includes the first electrode layer 21 and the light-emitting layer 22, the first electrode layer 21 has a plurality of openings, and a plurality of pixel electrodes are provided between two adjacent openings. A light-emitting element is provided along the thickness direction of the display panel (i.e. Figure 1 In the a direction in the image, a pixel electrode (anode), a light-emitting layer 22 and a common electrode 23 (cathode) are sequentially arranged. The wavelength of light emitted by each light-emitting element is different. For the display panel to realize color display, the light-emitting element includes at least a red light-emitting element, which is provided with a red organic light-emitting layer; a green light-emitting element, which is provided with a green organic light-emitting layer; and a blue light-emitting element, which is provided with a blue organic light-emitting layer. The light-emitting element can also be a micro light-emitting element such as a sub-millimeter light-emitting diode (MiniLED) or a micrometer light-emitting diode (Micro LED). Figure 3 For example, Figure 3 The structures of the first light emitting element LED1 , the second light emitting element LED2 , and the third light emitting element LED3 are shown.

[0032] like Figure 3 and Figure 4 As shown, a driving circuit layer 108 is also provided between the light emitting element and the substrate 10, and the driving circuit layer 108 is provided with a plurality of pixel driving circuits (such as Figure 4 TR1, TR2, TR3) are electrically connected to the light emitting element through a pixel driving circuit. The pixel driving circuit is used to provide a driving signal to the light emitting element to ensure normal display. Depending on the driving mode of the light emitting element, the specific setting mode of the pixel driving circuit may be different. Specifically, when the driving mode of the light emitting element is active driving, the pixel driving circuit includes a plurality of transistors (such as Figure 4 The first transistor TR1, the second transistor TR2, and the third transistor TR3 are shown in FIG. 1 ), and the first transistor TR1, the second transistor TR2, and the third transistor TR3 are used to drive the first light-emitting element LED1, the second light-emitting element LED2, and the third light-emitting element LED3 to emit light. Similarly, the pixel driving circuit may also be a 2T1C circuit, i.e., a circuit having two transistors and one storage capacitor, or a 7T1C circuit, i.e., a circuit having seven transistors and one storage capacitor, etc. The embodiment of the present invention does not limit the specific structure of the pixel driving circuit. Figure 4 The structure of one driving circuit layer is shown.

[0033] Among them, in order to achieve the color display effect of the display panel, the light-emitting elements usually include a first light-emitting element LED1, a second light-emitting element LED2 and a third light-emitting element LED3 with different light-emitting colors, wherein the wavelength of the light emitted by the first light-emitting element LED1 is greater than the wavelength of the light emitted by the second light-emitting element LED2, and the wavelength of the light emitted by the second light-emitting element LED2 is greater than the wavelength of the light emitted by the third light-emitting element LED3.

[0034] In some instances, such as Figure 3 As shown, a capping layer 100 may be formed on the common electrode 23 .

[0035] In addition, if Figure 2 As shown, a light shielding layer, a reflection control layer 50 and an optical adjustment layer 60 are sequentially arranged on the side of the light emitting layer away from the substrate 10. The light shielding layer is usually a light-proof black light shielding material, which is used to absorb the light emitted by the light emitting element to avoid crosstalk between different lights.

[0036] Specifically, Figure 2 As shown, the shading layer includes a plurality of shading portions 40, and the cross-sectional shape of the shading portion 40 in a predetermined direction is one of a rectangular, a triangular, a trapezoidal, and an arc shape ( Figure 2 The predetermined direction is the thickness direction of the display panel. Figure 2 The shapes of the cross sections of the plurality of light shielding portions in the predetermined direction may be the same or different, but they should be convex structures, so that the reflection control layer can be directly prepared into a convex shape, and the convex part can be used as a low refractive index layer for optical adjustment, which can save a process of making a low refractive index layer and reduce the process.

[0037] It should be noted that Figure 1 The cross-sectional shape of the light shielding portion is a trapezoid. Figure 2 The cross-sectional shape of the light-shielding portion in the figure is a triangle. This is for illustration only. The light-shielding portion may be prepared into other convex shapes in different preparation processes. However, the shapes of all the light-shielding portions on a display panel may be the same or different, and there is no limitation on this.

[0038] In some examples, the thickness of the shading layer is 2μm to 3μm. Limiting the thickness of the shading layer is actually limiting the thickness of the shading portion. If the thickness of the shading portion is small, the reflection control layer is likely to form a relatively flat structure during the preparation process, and thus a low-refractive-index optical adjustment layer cannot be formed. That is, by controlling the thickness of the shading portion within a larger range, a convex structure can be formed, so that the reflection control layer is directly prepared into a convex shape, and the convex portion is used as a low-refractive-index layer (i.e., the first optical adjustment layer) for optical adjustment. Figure 1 The optical adjustment layer 60 shown is a second optical adjustment layer with a high refractive index.

[0039] The reflection control layer can effectively reduce the effect of ambient light reflection in the organic light emitting diode display and improve the light emitting effect of the organic light emitting diode display. The optical adjustment layer can improve the light emitting efficiency of the display panel and adjust the angle of the emitted light to improve the light emitting efficiency of the organic light emitting display panel.

[0040] For visible light, the reflection control layer may have a relatively low refractive index, and the optical adjustment layer may have a relatively high refractive index, that is, the refractive index of the reflection control layer is less than the refractive index of the optical adjustment layer. The second portion of the reflection control layer may serve as a low refractive index layer, and the optical adjustment layer serves as a high refractive index layer. In an embodiment, for visible light, the refractive index of the optical adjustment layer is greater than the refractive index of the reflection control layer. For example, the difference between the refractive index of the optical adjustment layer and the refractive index of the reflection control layer may be about 0.05 or greater. The difference between the refractive index of the optical adjustment layer and the refractive index of the reflection control layer may be about 0.1 or greater. In the case where the difference between the refractive index of the optical adjustment layer and the refractive index of the reflection control layer is less than 0.05, the light efficiency of the display panel may be reduced.

[0041] Therefore, in some examples, the refractive index of the reflection control layer is set to 1.1-1.5. The reflection control layer can only transmit light in the R, G, and B bands, thereby replacing the RGB color resistance. In addition, the reflection control layer is a low-refractive index material with a refractive index of 1.1-1.5, which meets the refractive index requirements of the low-refractive index layer in the MLP structure. At the same time, the reflection control layer is a light-transmitting material, which can ensure the light output effect.

[0042] Wherein, due to the first portion defined in the reflection control layer and the difference in refractive index between the optical adjustment layer and the reflection control layer, the first portion of the reflection control layer can perform a lens function. Figure 3 As shown, among the light emitted by the first light emitting element LED1, the second light emitting element LED2 and the third light emitting element LED3, the light L incident on the first portion of the reflection control layer can be emitted to the outside of the display panel in a direction perpendicular to the substrate 10. Accordingly, the light efficiency of the display panel can be improved. Among them, the area where the light emitting element is located is the light emitting area, and the remaining area is the non-light emitting area.

[0043] The light shielding portion may overlap with the non-luminescent area (or be arranged in the non-luminescent area). The light shielding portion may block light incident to the light shielding portion. Accordingly, the light shielding portion may prevent color mixing between the luminescent areas. The light shielding portion may include an organic material or an inorganic material containing a black pigment or a black dye.

[0044] like Figure 3 As shown, the reflection control layer 50 may cover the light shielding portion 40. Since the display panel includes the reflection control layer, the display panel may not include a polarizer. For example, the reflection control layer may replace the function of the polarizer. In other words, the reflection control layer may selectively absorb external light reflected from the inside of the display panel according to the wavelength to prevent the light efficiency of the display panel from deteriorating.

[0045] The reflection control layer may include an organic material, such as an acrylic resin material or the like.

[0046] In some instances, such as Figure 3 and Figure 5 As shown, the reflection control layer 50 further includes a transition surface, which connects the adjacent first surface and the third surface, and the maximum angle between the cut surface of the transition surface and the substrate 10 is α, and 65°≤α≤85°. Figure 5 As shown in FIG. 1 , B is the first surface, C is the third surface, and the surface connecting the first surface and the third surface is the transition surface. The angle α between the section of the transition surface and the substrate is as shown in FIG. Figure 5As shown in , the reason why an angle greater than 65° is needed is because this can better control the propagation and scattering direction of light, thereby improving the brightness and clarity of the display panel. When the angle is less than 65°, the number of times the light is reflected inside the panel will increase, resulting in increased light loss and reduced brightness. At the same time, when the angle is small, the light is more likely to produce diffuse reflection and scattering, affecting the clarity and contrast of the display panel. Therefore, by using an MLP solution with an angle greater than 65°, the number of light reflections can be reduced, light loss can be reduced, and diffuse reflection and scattering can be reduced, thereby improving the brightness and clarity of the display panel. This not only allows the first surface and the third surface to be smoothly connected, but also reduces the light loss caused by light being emitted to the junction of the first surface and the second surface.

[0047] The reflection control layer needs to absorb all light in other wavelength bands except red, green and blue, so as to reduce the effect of ambient light reflection in the organic light emitting diode display and improve the light emission effect of red, green and blue. Therefore, the reflection control layer absorbs light in at least three wavelength bands selected from the first wavelength band of 430nm or less, the second wavelength band of 480nm to 510nm, the third wavelength band of 575nm to 605nm and the fourth wavelength band of 650nm or more. After the reflection control layer absorbs the light in the above at least three wavelength bands, it can only transmit blue light with a wavelength of 450nm to 475nm, green light with a wavelength of 525nm to 570nm and red light with a wavelength of 622nm to 770nm, thereby replacing the RGB color resistance.

[0048] like Figure 3 As shown, the light emitted by the light emitting element is refracted by the reflection control layer and then emitted through the light adjustment layer. The refraction path of the light emitted by the light emitting element is as shown in FIG. Figure 3 As shown in FIG. 1 , since the efficiency of blue light is the lowest, the light loss caused by the light passing through the film layer can be reduced by thinning the thickness of the reflection control layer, and the luminous efficiency of the blue light can be further increased, thereby improving the service life of the display panel. Therefore, in some examples, when the light absorbed by the reflection control layer is the light of the first wavelength band, the thickness of the reflection control layer is the first thickness, and when the light absorbed by the reflection control layer is the light of the second wavelength band, the thickness of the reflection control layer is the second thickness, the wavelength of the light of the first wavelength band is smaller than the wavelength of the light of the second wavelength band, and the first thickness is smaller than the second thickness.

[0049] The first band light is blue light with a wavelength of 450nm to 475nm, the second band light includes green light with a wavelength of 525nm to 570nm and red light with a wavelength of 622nm to 770nm, the first thickness can be 3μm, and the second thickness can be 3.5μm.

[0050] In some instances, such as Figure 6 As shown, the display panel further includes: an encapsulation layer 70, which is located on the side of the light-emitting layer 22 away from the substrate 10; and a touch sensing layer 80, which is located between the encapsulation layer 70 and the light-shielding layer. The encapsulation layer generally includes a three-layer structure of an inorganic layer-an organic layer-an inorganic layer, and the encapsulation layer can prevent impurities, moisture, etc. from passing through the first light-emitting element, the second light-emitting element, and the third light-emitting element from the outside. The encapsulation layer may include at least one of an inorganic encapsulation layer and an organic encapsulation layer.

[0051] For example, the inorganic encapsulation layer may include at least one of silicon oxide, silicon nitride, silicon oxynitride, and the like, and the organic encapsulation layer may include at least one of polymer curing materials such as polyacrylate, and the like.

[0052] The touch sensing layer may be disposed on the encapsulation layer. The touch sensing layer may be used as an input unit of the display panel. Figure 6 As shown, the touch sensing layer may include at least one of a protection layer 81 , a first touch insulating layer 83 , a second touch insulating layer 82 , a first touch electrode 84 , and a second touch electrode 85 .

[0053] The first touch insulating layer 83 may be disposed on the encapsulation layer 70. The first touch insulating layer 83 may include an inorganic material and / or an organic material. For example, the first touch insulating layer 83 may include an inorganic material such as silicon oxide, silicon nitride, etc. These may be used alone or in combination with each other.

[0054] The first touch electrode 84 may be arranged on the first touch insulating layer 83. The first touch electrode 84 may overlap the non-light emitting area. For example, the first touch electrode 84 may include at least one of a metal, an alloy, a metal nitride, a conductive metal oxide, a transparent conductive material, etc. These may be used alone or in combination with each other.

[0055] The second touch insulating layer 82 may be arranged on the first touch insulating layer 83 and the first touch electrode 84. The second touch insulating layer 82 may fully cover the first touch electrode 84. The second touch insulating layer 82 may include an inorganic material or an organic material. For example, the second touch insulating layer 82 may include an inorganic material such as silicon oxide, silicon nitride, etc. These may be used alone or in combination with each other.

[0056] The second touch electrode 85 may be arranged on the second touch insulating layer 82. The second touch electrode 85 may overlap with the non-luminous area. The second touch electrode 85 may be electrically connected to the first touch electrode 84 through a contact hole passing through the second touch insulating layer 82. For example, the second touch electrode 85 may include at least one of carbon nanotubes (CNTs), transparent conductive oxides, indium tin oxide (ITO), indium gallium zinc oxide (IGZO), zinc oxide (ZnO), graphene, silver nanowires (AgNW), copper (Cu), chromium (Cr), etc. These may be used alone or in combination with each other. The second touch electrode overlaps with the shading portion and is covered by the shading portion, avoiding the additional provision of a touch layer, which is beneficial to reducing the thickness of the display panel and facilitating the thin and light production of the display panel.

[0057] The first touch electrode 84 and the second touch electrode 85 are connected through a via hole, and the first touch electrode 84 and the second touch electrode 85 form a capacitive touch structure to ensure the touch effect of the display panel.

[0058] The first touch electrode 84 and the second touch electrode 85 may include the same material. As another example, the first touch electrode 84 and the second touch electrode 85 may include different materials.

[0059] The protective layer 81 may be disposed on the second touch insulating layer 82 and the second touch electrode 85. The protective layer 81 may fully cover the second touch electrode 85. The protective layer 81 may protect the first touch electrode 84 and the second touch electrode 85. The protective layer 81 may include an inorganic material and / or an organic material. For example, the protective layer 81 may include an inorganic material such as silicon oxide, silicon nitride, etc. These may be used alone or in combination with each other.

[0060] Figure 7 is a logical schematic diagram of a method for preparing a display panel, such as Figure 7 As shown, the method comprises the following steps:

[0061] Step S101, as Figure 8 As shown, a substrate 10 is provided;

[0062] Step S102, as Figure 1 and Fig. 9 As shown, a first electrode layer 21, a pixel defining layer 30, a light emitting layer 22, a light shielding layer, a reflection control layer 50 and an optical adjustment layer 60 are sequentially formed on a substrate 10, the light shielding layer includes a plurality of second openings and a light shielding portion 40, and a light shielding portion 40 is provided between two adjacent second openings;

[0063] like Fig. 9 As shown, a common electrode 23 is further formed on the side of the light emitting layer 22 facing away from the substrate 10 .

[0064] Wherein, a half-tone mask is used to expose the reflection control layer to be formed, such as Fig.10 As shown, the half-tone mask plate 500 includes a first light-transmitting portion and a second light-transmitting portion, the transmittance of the first light-transmitting portion is different from the transmittance of the second light-transmitting portion, and the orthographic projection of the first light-transmitting portion on the substrate coincides with the area where the first part of the reflection control layer is to be formed, and the orthographic projection of the second light-transmitting portion on the substrate coincides with the area where the second part of the reflection control layer is to be formed, or, the thickness of the shading layer is controlled to be 2 to 3 um, the shading layer is exposed and developed to form the shading portion, and the reflection control layer is directly coated on the shading portion, so that the second part of the reflection control layer is a structure protruding from the first part.

[0065] like Fig.10 As shown, the first light-transmitting portion of the half-tone mask 500 includes a first sub-light-transmitting portion 510, a second sub-light-transmitting portion 520 and a third sub-light-transmitting portion 530, and the first sub-light-transmitting portion 510, the second sub-light-transmitting portion 520 and the third sub-light-transmitting portion 530 correspond to the first light-emitting element, the second light-emitting element and the third light-emitting element respectively, and the first light-emitting element, the second light-emitting element and the third light-emitting element are light-emitting elements that emit three colors of R, G and B respectively, wherein the first sub-light-transmitting portion 510, the second sub-light-transmitting portion 520 and the third sub-light-transmitting portion 530 have different transmittances, so that the film thickness of the RGB pixel area can be adjusted respectively, thereby achieving the adjustment of the optical hue.

[0066] The control method of the above-mentioned display panel of the present application first forms a first electrode layer, a pixel defining layer, a light-emitting layer, a shading layer, a reflection control layer and an optical adjustment layer on a substrate in sequence, wherein the shading layer includes a plurality of second openings and a shading portion; then, a half-tone mask is used to expose the reflection control layer, wherein the half-tone mask includes a first light-transmitting portion and a second light-transmitting portion, wherein the transmittance of the first light-transmitting portion is different from that of the second light-transmitting portion, and an orthographic projection of the first light-transmitting portion on the substrate coincides with an area where the first part of the reflection control layer is to be formed, and an orthographic projection of the second light-transmitting portion on the substrate coincides with an area where the second part of the reflection control layer is to be formed, or, the thickness of the shading layer is controlled to be 2 to 3 um, the shading layer is exposed and developed to form a shading portion, and the reflection control layer is directly coated on the shading portion, so that the second part of the reflection control layer is a structure protruding from the first part. That is, the control method of the above-mentioned display panel sets the shading part as a convex structure and increases the thickness of the shading part. The reflection control layer is prepared by using a mask plate or direct coating. During the preparation process, the reflection control layer is directly prepared into a convex shape, and the convex part is used as a low refractive index layer. This can save a process for making a low refractive index layer, reduce the process, and solve the problem that the existing organic light-emitting display device has a complex process and poor light efficiency.

[0067] Among them, there are three advantages of using HT Mask to form a reflection control layer: 1. The process is reduced, saving an MLP low-refractive index layer; 2. The HTM process can reduce the taper of the surface of the MLP low-refractive index layer, and the reduced taper can improve the light efficiency; 3. The HTM process can be used to separately adjust the film thickness of the RGB pixel area, which can achieve the adjustment of the optical hue.

[0068] like Figure 6 As shown, a first transistor TR1, a second transistor TR2, a third transistor TR3 and an insulating layer 90 are also formed on the substrate 10, and a first electrode layer 21, a pixel defining layer 30, a light-emitting layer 22, a common electrode 23, a covering layer 100, an encapsulation layer 70 and a touch sensing layer 80 are sequentially formed on the insulating layer 90, wherein the touch sensing layer 80 includes a protective layer 81, a second touch insulating layer 82, a first touch insulating layer 83, a first touch electrode 84 and a second touch electrode 85, and a shading portion 40, a reflection control layer 50 and an optical adjustment layer 60 are also sequentially formed on the touch sensing layer 80.

[0069] In some instances, a first electrode layer, a pixel defining layer, a light-emitting layer, a light-shielding layer, a reflection control layer, and an optical adjustment layer are sequentially formed on a substrate, including: forming a first electrode layer on one side of the substrate; forming a preliminary pixel defining layer on a side of the first electrode layer away from the substrate; patterning the preliminary pixel defining layer to obtain a plurality of first openings to obtain a pixel defining layer; and forming a light-emitting layer on a side of the first opening away from the substrate.

[0070] Among them, Figure 6 As shown, the pixel defining layer 30 may be arranged on the insulating layer 90 and the first pixel electrode, the second pixel electrode and the third pixel electrode. The pixel defining layer 30 may overlap with the non-luminous area. The pixel defining layer 30 may cover the side (e.g., two sides) of each of the first pixel electrode, the second pixel electrode and the third pixel electrode, and may expose at least a portion of the upper surface of each of the first pixel electrode, the second pixel electrode and the third pixel electrode. The pixel defining layer 30 may include an organic material and / or an inorganic material. In an embodiment, the pixel defining layer 30 may include an organic material. For example, the pixel defining layer 30 may include at least one of a photoresist, a polyacrylic resin, a polyimide resin, a polyamide resin, a siloxane resin, an acrylic resin, an epoxy resin, etc. These may be used alone or in combination with each other.

[0071] In some instances, a first electrode layer, a pixel defining layer, a light-emitting layer, a shading layer, a reflection control layer and an optical adjustment layer are sequentially formed on a substrate, including: forming a shading layer on a side of the light-emitting layer facing away from the substrate; etching the shading layer to obtain a plurality of second openings, wherein an orthographic projection of the second opening on the substrate at least partially overlaps with an orthographic projection of a first opening of the pixel defining layer on the substrate, and a shading portion is formed between two adjacent second openings.

[0072] By increasing the thickness of the shading portion, the reflection control layer can be directly prepared into a convex shape during the preparation process, and the convex portion can be used as a low refractive index layer. This can save a process for making a low refractive index layer, reduce the process, and solve the problem that the existing organic light-emitting display device has a complex process and poor light efficiency.

[0073] In some instances, a first electrode layer, a pixel defining layer, a light-emitting layer, a light-shielding layer, a reflection control layer and an optical adjustment layer are sequentially formed on a substrate, including: forming a preliminary optical adjustment layer on a layer of the reflection control layer away from the substrate; and removing part of the preliminary optical adjustment layer covering the light-shielding portion of the light-shielding layer to obtain the optical adjustment layer.

[0074] Among them, the optical adjustment layer may have a relatively high refractive index. For visible light, the refractive index of the optical adjustment layer may be greater than the refractive index of the reflection control layer. Due to the difference in refractive index between the first portion defined in the reflection control layer and the optical adjustment layer and the reflection control layer, the first portion of the reflection control layer may perform a lens function. For example, among the light emitted from the first light-emitting element, the second light-emitting element, and the third light-emitting element, the light incident on the first portion of the reflection control layer may be emitted to the outside of the display panel in a direction perpendicular to the substrate. Accordingly, the light efficiency of the display panel may be improved.

[0075] Fig.11 is a schematic diagram of the structure of a display device, such as Fig.11 As shown, a display panel 400 including any one of the items.

[0076] The above-mentioned display device of the present application includes a display panel, in which a shading portion is set as a convex structure, and the thickness of the shading portion is increased. A reflection control layer is prepared by using a mask plate or direct coating. During the preparation process, the reflection control layer is directly prepared into a convex shape, and the convex portion is used as a low refractive index layer. This can save a process for preparing a low refractive index layer, reduce the process, and solve the problem that the process of existing organic light-emitting display devices is relatively complicated and the light efficiency is poor.

[0077] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0078] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0079] 1) The reflection control layer of the display panel of the present application includes a first part and a second part, the first part at least partially overlaps with the orthographic projection of the light-emitting layer on the substrate, and the second part at least partially overlaps with the orthographic projection of the light-shielding portion on the substrate, wherein the first part has a first surface and a second surface opposite to each other in the thickness direction of the display panel, the first surface is located on the side of the second surface away from the substrate, and the first surface and the second surface are parallel to the substrate; the second part has a third surface and a fourth surface opposite to each other in the thickness direction of the display panel, the third surface is located on the side of the fourth surface away from the substrate; the distance between the first surface and the first electrode layer is a first distance, the distance between the third surface and the first electrode layer is a second distance, and the first distance is less than the second distance. That is, the light-shielding portion of the display panel is set as a convex structure, and the thickness of the light-shielding portion is increased, so that in the preparation process, the reflection control layer is directly prepared into a convex shape, and the convex portion is used as a low refractive index layer, which can save a process for making a low refractive index layer, reduce the process, and solve the problem that the process of the existing organic light-emitting display device is complicated and the light efficiency is poor.

[0080] 2) The control method of the above-mentioned display panel of the present application is firstly to form a first electrode layer, a pixel defining layer, a light-emitting layer, a shading layer, a reflection control layer and an optical adjustment layer in sequence on a substrate, wherein the shading layer includes a plurality of second openings and a shading portion; then, a half-tone mask is used to expose the reflection control layer, wherein the half-tone mask includes a first light-transmitting portion and a second light-transmitting portion, wherein the transmittance of the first light-transmitting portion is different from that of the second light-transmitting portion, and an orthographic projection of the first light-transmitting portion on the substrate coincides with an area where the first part of the reflection control layer is to be formed, and an orthographic projection of the second light-transmitting portion on the substrate coincides with an area where the second part of the reflection control layer is to be formed; alternatively, the thickness of the shading layer is controlled to be 2 to 3 um, the shading layer is exposed and developed to form a shading portion, and the reflection control layer is directly coated on the shading portion so that the second part of the reflection control layer is a structure protruding from the first part. That is, the control method of the above-mentioned display panel sets the shading part as a convex structure and increases the thickness of the shading part. The reflection control layer is prepared by using a mask plate or direct coating. During the preparation process, the reflection control layer is directly prepared into a convex shape, and the convex part is used as a low refractive index layer. This can save a process for making a low refractive index layer, reduce the process, and solve the problem that the existing organic light-emitting display device has a complex process and poor light efficiency.

[0081] 3) The above-mentioned display device of the present application includes a display panel, in which the shading portion is set as a convex structure, and the thickness of the shading portion is increased. The reflection control layer is prepared by a mask plate or direct coating. During the preparation process, the reflection control layer is directly prepared into a convex shape, and the convex part is used as a low refractive index layer. This can save a process for making a low refractive index layer, reduce the process, and solve the problem that the existing organic light-emitting display device has a complex process and poor light efficiency.

[0082] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A first electrode layer, located on one side of the substrate; A pixel defining layer, located on a side of the first electrode layer away from the substrate, the pixel defining layer comprising a plurality of first openings; a light-emitting layer, at least partly located in the first opening; a light shielding layer, located on a side of the light-emitting layer away from the substrate, the light shielding layer comprising a plurality of second openings and a light shielding portion, the orthographic projection of the first opening on the substrate at least partially overlaps the orthographic projection of the second opening on the substrate, and the light shielding portion is provided between two adjacent second openings; a reflection control layer, located on a side of the light-shielding layer away from the substrate, the reflection control layer comprising a first portion and a second portion, the first portion at least partially overlapping with an orthographic projection of the light-emitting layer on the substrate, and the second portion at least partially overlapping with an orthographic projection of the light-shielding portion on the substrate; an optical adjustment layer, located on a side of the reflection control layer away from the substrate; The first portion has a first surface and a second surface opposite to each other in the thickness direction of the display panel, the first surface is located on a side of the second surface away from the substrate, and the first surface and the second surface are parallel to the substrate; the second portion has a third surface and a fourth surface opposite to each other in the thickness direction of the display panel, the third surface is located on a side of the fourth surface away from the substrate; The distance between the first surface and the first electrode layer is a first distance, the distance between the third surface and the first electrode layer is a second distance, and the first distance is smaller than the second distance.

2. The display panel according to claim 1, characterized in that: The cross-section of the light shielding portion in a predetermined direction has a shape of a rectangle, a triangle, a trapezoid, or an arc, and the predetermined direction is a thickness direction of the display panel.

3. The display panel according to claim 1, characterized in that: The thickness of the light shielding layer is 2 μm to 3 μm.

4. The display panel according to claim 1, characterized in that: The refractive index of the reflection control layer is 1.1-1.

5.

5. The display panel according to claim 1, characterized in that: The refractive index of the reflection control layer is smaller than the refractive index of the optical adjustment layer.

6. The display panel according to claim 1, characterized in that: The reflection control layer further includes a transition surface, wherein the transition surface connects the adjacent first surface and the third surface, and the maximum angle between a cut surface of the transition surface and the substrate is α, and 65°≤α≤85°.

7. The display panel according to claim 1, characterized in that: The reflection control layer absorbs light in at least three wavelength bands selected from a first wavelength band of 430 nm or less, a second wavelength band of 480 nm to 510 nm, a third wavelength band of 575 nm to 605 nm, and a fourth wavelength band of 650 nm or more.

8. The display panel according to claim 1, characterized in that: When the light absorbed by the reflection control layer is light of the first wavelength band, the thickness of the reflection control layer is the first thickness; when the light absorbed by the reflection control layer is light of the second wavelength band, the thickness of the reflection control layer is the second thickness; the wavelength of the light of the first wavelength band is smaller than the wavelength of the light of the second wavelength band, and the first thickness is smaller than the second thickness.

9. The display panel according to claim 1, characterized in that: The display panel further includes: an encapsulation layer, the encapsulation layer being located on a side of the light-emitting layer away from the substrate; A touch sensing layer is located between the encapsulation layer and the light shielding layer.

10. A method for preparing a display panel according to any one of claims 1 to 9, characterized in that: The method comprises: providing a substrate; A first electrode layer, a pixel defining layer, a light emitting layer, a light shielding layer, a reflection control layer and an optical adjustment layer are sequentially formed on the substrate, wherein the light shielding layer comprises a plurality of second openings and a light shielding portion, and the light shielding portion is disposed between two adjacent second openings; Wherein, a half-tone mask is used to expose the reflection control layer to be formed, the half-tone mask includes a first light-transmitting portion and a second light-transmitting portion, the transmittance of the first light-transmitting portion is different from the transmittance of the second light-transmitting portion, and the orthographic projection of the first light-transmitting portion on the substrate coincides with the area where the first part of the reflection control layer is to be formed, and the orthographic projection of the second light-transmitting portion on the substrate coincides with the area where the second part of the reflection control layer is to be formed, or, the thickness of the shading layer is controlled to be 2 to 3 um, the shading layer is exposed and developed to form the shading portion, and the reflection control layer is directly coated on the shading portion, so that the second part of the reflection control layer is a structure protruding from the first part.

11. The method for preparing a display panel according to claim 10, characterized in that: A first electrode layer, a pixel defining layer, a light emitting layer, a light shielding layer, a reflection control layer and an optical adjustment layer are sequentially formed on the substrate, including: forming the first electrode layer on one side of the substrate; forming a preliminary pixel defining layer on a side of the first electrode layer facing away from the substrate; Patterning the preliminary pixel defining layer to obtain a plurality of first openings to obtain the pixel defining layer; The light emitting layer is formed on a side of the first opening away from the substrate.

12. The method for preparing a display panel according to claim 10, characterized in that: A first electrode layer, a pixel defining layer, a light emitting layer, a light shielding layer, a reflection control layer and an optical adjustment layer are sequentially formed on the substrate, including: forming a light shielding layer on a side of the light emitting layer facing away from the substrate; The light shielding layer is etched to obtain a plurality of second openings, wherein the orthographic projections of the second openings on the substrate at least partially overlap with the orthographic projections of the first openings of the pixel defining layer on the substrate, and a light shielding portion is formed between two adjacent second openings.

13. The method for preparing a display panel according to claim 10, characterized in that: A first electrode layer, a pixel defining layer, a light emitting layer, a light shielding layer, a reflection control layer and an optical adjustment layer are sequentially formed on the substrate, including: forming a preliminary optical adjustment layer on a layer of the reflection control layer away from the substrate; The portion of the preliminary optical adjustment layer covering the light shielding portion of the light shielding layer is removed to obtain the optical adjustment layer.

14. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 9.

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