Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device, and belongs to the technical field of display. The pixel defining layer is arranged on one side of the substrate, a plurality of opening areas are defined on the substrate by the pixel defining layer, the pixel defining layer comprises a plurality of first step structures, and orthographic projections of the first step structures on the substrate are adjacent to the opening areas; wherein the first step structure comprises a first sub-step and a second sub-step which are connected with each other, the first sub-step is closer to the opening area, a first included angle is formed between a tangent line of the edge of one side, close to the opening area, of the first sub-step and the substrate, and a second included angle is formed between a tangent line of the edge of one side, close to the opening area, of the second sub-step and the substrate; the angle value of the first included angle is smaller than that of the second included angle. According to the display panel, the preparation method thereof and the display device, the color separation phenomenon of the display panel can be reduced, and the display effect of the display panel is guaranteed.

Description

Technical Field

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

[0002] Organic Light-Emitting Diode (OLED) panels have attracted widespread attention due to their advantages such as self-luminescence, low power consumption, lightness, flexibility, brilliant colors, high contrast, and fast response rate, and have become the representative of the next generation of display. In OLED display products, a color filter on encapsulation (COE) is often used on the encapsulation layer to replace the polarizer to improve the transmittance.

[0003] Currently, devices at certain positions in a display panel will reflect light incident into the display panel to a light-emitting area, causing the light to diffract, thereby causing color separation on the display panel and affecting the display effect of the display panel. Summary of the invention

[0004] The present application provides a display panel and a method for manufacturing the same, and a display device, aiming to reduce the color separation phenomenon occurring in the display panel and ensure the display effect of the display panel.

[0005] A first aspect of an embodiment of the present application provides a display panel, including:

[0006] substrate;

[0007] A pixel defining layer is disposed on one side of the substrate, and the pixel defining layer defines a plurality of opening areas on the substrate, and the pixel defining layer includes a plurality of first step structures, and the orthographic projections of the first step structures on the substrate are adjacent to the opening areas;

[0008] Among them, the first step structure includes a first sub-step and a second sub-step connected to each other, the first sub-step is closer to the opening area, a first angle is formed between the tangent of the edge of the first sub-step close to the opening area and the substrate, and a second angle is formed between the tangent of the edge of the second sub-step close to the opening area and the substrate, and the angle value of the first angle is smaller than the angle value of the second angle.

[0009] Optionally, the first stepped structure is distributed along the circumference of the opening area.

[0010] Optionally, the angle value of the first angle is greater than or equal to 20° and less than or equal to 30°.

[0011] Optionally, the angle value of the second included angle is greater than or equal to 70° and less than or equal to 80°.

[0012] Optionally, the display panel further includes a color filter layer disposed on a side of the pixel defining layer away from the substrate;

[0013] The color filter layer includes a black matrix and a plurality of color resist blocks. The black matrix defines a plurality of openings on the substrate, and the plurality of color resist blocks are respectively located in different ones of the openings, and the openings correspond to the opening regions one by one;

[0014] The orthographic projection of the opening region on the substrate is located within the orthographic projection range of the opening on the substrate.

[0015] Optionally, the orthographic projection of the first stepped structure on the substrate and the orthographic projection of the opening on the substrate at least partially overlap.

[0016] Optionally, the orthographic projection of the second sub-stepped structure on the substrate and the orthographic projection range of the part of the opening that exceeds the corresponding opening region on the substrate at least partially overlap.

[0017] Optionally, the black matrix includes a plurality of second stepped structures, and the orthographic projection of the second stepped structure on the substrate is adjacent to the opening;

[0018] Wherein, the second stepped structure includes a third sub-stepped structure and a fourth sub-stepped structure that are connected to each other. The third sub-stepped structure is closer to the opening, and the sum of the dimensions of the third sub-stepped structure and the fourth sub-stepped structure in the normal direction of the display panel is greater than the dimension of the color resist block in the normal direction of the display panel.

[0019] Optionally, the dimension of the third sub-stepped structure in the normal direction of the display panel is less than the dimension of the color resist block in the normal direction of the display panel, and the surface of the fourth sub-stepped structure on the side away from the substrate is higher than the surface of the color resist block on the side away from the substrate.

[0020] Optionally, the height difference between the surface of the fourth sub-stepped structure on the side away from the substrate and the surface of the color resist block on the side away from the substrate is greater than or equal to 2.0 μm and less than or equal to 3.0 μm.

[0021] Optionally, a third included angle is formed between the tangent line of one side edge of the third sub-stepped structure close to the opening and the substrate, and a fourth included angle is formed between the tangent line of one side edge of the fourth sub-stepped structure close to the opening and the substrate;

[0022] The angle value of the third included angle is approximately equal to the angle value of the fourth included angle.

[0023] In the second aspect of the embodiments of the present application, a display device is provided, which includes a display panel provided in the first aspect of the embodiments of the present application.

[0024] In the third aspect of the embodiments of the present application, a method for manufacturing a display panel is provided, and the manufacturing method includes:

[0025] Providing a substrate;

[0026] Forming a pixel defining layer on one side of the substrate, and the pixel defining layer defines a plurality of opening regions on the substrate;

[0027] Exposing the peripheral position of the pixel defining layer adjacent to the opening region through a mask plate process to form a plurality of first stepped structures;

[0028] Wherein, the first stepped structure includes a first sub-step and a second sub-step connected to each other. The first sub-step is closer to the opening region. The tangent of the edge of the first sub-step close to the opening region forms a first angle with the substrate. The tangent of the edge of the second sub-step close to the opening region forms a second angle with the substrate, and the angle value of the first angle is less than the angle value of the second angle.

[0029] Optionally, the mask plate is provided with a plurality of openings at the peripheral position, and the size of the opening corresponding to the position of the first sub-step is larger than the size of the opening corresponding to the position of the second sub-step.

[0030] Optionally, the shape of the opening includes a square, a circle, a strip or a polygon.

[0031] Advantageous effects:

[0032] The present application provides a display panel, a manufacturing method thereof, and a display device. The display panel includes a substrate and a pixel defining layer. The pixel defining layer defines a plurality of opening regions on the substrate. The pixel defining layer includes a first stepped structure. The first stepped structure includes a first sub-step and a second sub-step connected to each other. The tangent of the edge of the first sub-step close to the opening region forms a first angle with the substrate. The tangent of the edge of the second sub-step close to the opening region forms a second angle with the substrate, and the angle value of the first angle is less than the angle value of the second angle. In this way, the light-emitting layer can be separated by using the first sub-step with a smaller angle, and the light can be prevented from being reflected to the opening region by using the second sub-step with a larger angle, thereby preventing light from generating diffraction, improving the color separation phenomenon of the display panel, and improving the display effect of the display panel. Description of the Drawings

[0033] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the description of the embodiments of the present application will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0034] Figure 1 is a schematic structural diagram of a display panel proposed in an embodiment of the present application;

[0035] Figure 2 is a schematic structural diagram of a first stepped structure in a display panel proposed in an embodiment of the present application;

[0036] Figure 3 is a planar structure diagram for representing the first stepped structure in a display panel proposed in an embodiment of the present application;

[0037] Figure 4 is a schematic structural diagram of a display panel including a black matrix with a second stepped structure proposed in an embodiment of the present application;

[0038] Figure 5 is a step flow chart of a method for manufacturing a display panel proposed in an embodiment of the present application;

[0039] Figure 6 is a schematic structural diagram of a mask plate in a method for manufacturing a display panel proposed in an embodiment of the present application.

[0040] Description of reference numerals: 10, substrate; 20, driving circuit layer; 21, active layer; 22, first gate insulating layer; 23, gate; 24, second gate insulating layer; 25, interlayer dielectric layer; 26, source; 27, drain; 28, planarization layer; 31, first pixel electrode; 32, pixel defining layer; 321, first stepped structure; 321a, first sub-stepped structure; 321b, second sub-stepped structure; 33, light-emitting part; 34, second pixel electrode; 41, first inorganic encapsulation film layer; 42, organic encapsulation film layer; 43, second inorganic encapsulation film layer; 50, color filter layer; 51, black matrix; 511, second stepped structure; 511a, third sub-stepped structure; 511b, fourth sub-stepped structure; 52, color resist block; 60, mask plate; A, opening area; B, opening. Detailed embodiments

[0041] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0042] In the related art, an OLED display product using a COE process has a pixel definition layer. The pixel definition layer can define a plurality of opening regions, and each pixel of the light-emitting layer is located in a different opening region. However, a slope will be formed at the position of the pixel definition layer close to the opening region. After the cathode of the subsequent light-emitting layer and the pixel definition layer are covered, the light incident into the opening region will be reflected again by the cathode at the slope position back into the opening region, thereby generating light diffraction, resulting in color separation in the display panel and affecting the display effect of the display panel.

[0043] In view of this, the embodiments of the present application propose a display panel, a preparation method thereof, and a display device, aiming to reduce the color separation phenomenon occurring in the display panel and ensure the display effect of the display panel.

[0044] Refer to Figure 1 As shown, a display panel disclosed in an embodiment of the present application includes a substrate 10 and a pixel definition layer 32 disposed on one side of the substrate 10.

[0045] Specifically, the substrate 10 can be a flexible substrate or a rigid substrate. When the substrate 10 is a flexible substrate, the display panel can have properties such as bendability or foldability; when the substrate 10 is a rigid substrate, it can meet the rigid requirements of the display panel; the specific properties of the substrate 10 are determined according to the actual needs of the product.

[0046] In addition, the substrate 10 can include a single-layer structure or a multi-layer structure. Exemplarily, the substrate 10 can include a polyimide layer and a buffer layer stacked in sequence; in other embodiments, the substrate 10 can also include a plurality of polyimide layers and buffer layers stacked in sequence. Among them, the buffer layer can be made of materials such as silicon nitride or silicon oxide to achieve the effects of blocking water and oxygen and blocking alkaline ions. It should be noted that the structure of the substrate 10 is not limited to this, and can be determined according to actual needs in specific applications.

[0047] Refer to Figure 1 As shown, the display panel further includes a driving circuit layer 20 and a light-emitting layer stacked in sequence on the substrate 10.

[0048] Specifically, the driving circuit layer 20 may include thin film transistors. Among them, the thin film transistor may be a top-gate type. This thin film transistor may include an active layer 21, a first gate insulating layer 22, a gate 23, a second gate insulating layer 24, an interlayer dielectric layer 25, a source electrode 26, and a drain electrode 27. Specifically, the active layer 21 may be formed on the substrate 10. The first gate insulating layer 22 covers the buffer layer and the active layer 21. The gate 23 is formed on the side of the first gate insulating layer 22 facing away from the active layer 21. The second gate insulating layer 24 covers the gate 23 and the first gate insulating layer 22. The interlayer dielectric layer 25 covers the second gate insulating layer 24. The source electrode 26 and the drain electrode 27 are formed on the side of the interlayer dielectric layer 25 facing away from the substrate 10 and are respectively located on opposite sides of the gate 23. The source electrode 26 and the drain electrode 27 may be in contact with opposite sides of the active layer 21 through vias (e.g., metal vias). It should be understood that this thin film transistor may also be a bottom-gate type.

[0049] Referring to Figure 1 As shown, the light-emitting layer includes a first pixel electrode 31 and a pixel defining layer 32 formed in sequence on the interlayer dielectric layer 25. It should be understood that the display panel may further include a light-emitting portion 33 and a second pixel electrode 34.

[0050] Specifically, when the thin film transistor is of the top-gate type, a planarization layer 28 may also be fabricated before manufacturing the display device. This planarization layer 28 may be a single-layer structure or a multi-layer structure. This planarization layer 28 is usually made of organic materials, such as materials like photoresist, acrylic-based polymers, and silicon-based polymers. Among them, the first pixel electrode 31 may be electrically connected to the drain electrode 27 through a metal via. The first pixel electrode 31 may be an anode, and this anode may be made of materials such as ITO (indium tin oxide), indium zinc oxide (IZO), zinc oxide (ZnO), etc. The pixel defining layer 32 may cover the planarized portion. The pixel defining layer 32 may be made of organic materials, such as organic materials like photoresist, and the pixel defining layer 32 has a plurality of opening regions A exposing the first pixel electrode 31. The light-emitting portion 33 is located within the opening regions A and is formed on the first pixel electrode 31. The light-emitting portion 33 may include small molecule organic materials or polymer molecule organic materials, may be a fluorescent light-emitting material or a phosphorescent light-emitting material, may emit red light, green light, blue light, or may emit white light, etc. And, according to actual different needs, in different examples, the light-emitting portion 33 may further include functional layers such as an electron injection layer, an electron transport layer, a hole injection layer, and a hole transport layer. The second pixel electrode 34 covers the light-emitting portion 33, and the polarity of the second pixel electrode 34 is opposite to that of the first pixel electrode 31. This second pixel electrode 34 may be a cathode, and this cathode may be made of metal materials such as lithium (Li), aluminum (Al), magnesium (Mg), silver (Ag), etc.

[0051] It should be noted that referring to Figure 1As shown, the first pixel electrode 31, the light-emitting part 33, and the second pixel electrode 34 can form a light-emitting sub-pixel. Among them, the display panel can include a plurality of light-emitting sub-pixels arranged in an array. In addition, it should be noted that the first pixel electrodes 31 of each light-emitting sub-pixel are independent of each other, and the second pixel electrodes 34 of each light-emitting sub-pixel are connected integrally across the board; that is, the second pixel electrode 34 is a whole-surface structure provided on the display panel and is a common electrode for a plurality of display devices, and the second pixel electrode 34 covers the pixel defining layer 32.

[0052] Referring Figure 1 and Figure 2 As shown, in the embodiment of the present application, the pixel defining layer 32 includes a plurality of first stepped structures 321. The first stepped structures 321 correspond to the opening regions A one by one, and the orthographic projection of the first stepped structures 321 on the substrate 10 is adjacent to the opening regions A. The first stepped structure 321 includes a first sub-stepped part 321a and a second sub-stepped part 321b that are connected to each other. The first sub-stepped part 321a is closer to the opening region A. It can be understood that both the first sub-stepped part 321a and the second sub-stepped part 321b are part of the pixel defining layer 32, and the relative height of the first sub-stepped part 321a is lower than that of the second sub-stepped part 321b.

[0053] At the same time, a first included angle is formed between the tangent line of the edge of the first sub-stepped part 321a close to the opening region A and the substrate 10, and a second included angle is formed between the tangent line of the edge of the second sub-stepped part 321b close to the opening region A and the substrate 10. The angle value of the first included angle is smaller than the angle value of the second included angle. Specifically, both the first sub-stepped part 321a and the second sub-stepped part 321b have a certain slope. However, in the implementation of the present application, the morphologies of the first sub-stepped part 321a and the second sub-stepped part 321b are arc-shaped. Therefore, their respective slopes need to be determined by the included angle between the tangent line of the edge close to the opening side and the substrate 10.

[0054] In the embodiment of the present application, since the first sub-stepped part 321a is adjacent to the opening region A, and the light-emitting part 33 is to be formed in the opening region A, the slope of the first sub-stepped part 321a is small, so that the first sub-stepped part 321a can isolate the light-emitting part 33 in the opening region A; while the slope of the second sub-stepped part 321b is large. When the light incident into the display panel reaches the second sub-stepped part 321b, the cathode covering the second sub-stepped part 321b will reflect the light to the position between the opening regions A. In this way, diffraction will not occur between the light reflected by the cathode and the light emitted by the light-emitting part 33, thereby improving the color separation phenomenon of the display panel and enhancing the display effect of the display panel.

[0055] In the embodiment of the present application, the first sub-step 321a and the second sub-step 321b of the first stepped structure 321 can be realized by an OPC (Optical Proximity Correction) process, that is, by performing OPC design on the pattern of the mask, specifically, adding a pattern to the peripheral position corresponding to the opening area A on the mask, and photolithography the pixel defining layer 32 through the mask, and finally forming the first stepped structure 321. Therefore, referring to Figure 3 As shown, in the embodiment of the present application, the first stepped structure 321 is distributed along the circumference of the opening area A.

[0056] At the same time, in the embodiment of the present application, the angle value of the first angle is greater than or equal to 20° and less than or equal to 30°; illustratively, the angle value of the first angle can be 20°, 22°, 25°, 28°, 30°, etc. Setting the angle value of the first angle in this range can make the first sub-step 321a better isolate the light-emitting portion 33.

[0057] In an embodiment of the present application, the angle value of the second angle is greater than or equal to 70° and less than or equal to 80°; exemplarily, the angle value of the second angle can be 70°, 72°, 75°, 78°, 80°, etc. Setting the angle value of the second angle within this range can enable the second sub-step 321b to better reflect light to the position between the opening areas A.

[0058] Reference Figure 1 As shown, in one embodiment, the display panel further includes an encapsulation layer, and the encapsulation layer is arranged on a side of the light emitting layer facing away from the substrate 10 .

[0059] Specifically, the encapsulation layer may include a first inorganic encapsulation film layer 41, an organic encapsulation film layer 42, and a second inorganic encapsulation film layer 43 which are stacked in sequence. The first inorganic encapsulation film layer 41 and the second inorganic encapsulation film layer 43 may be obtained by two chemical vapor deposition processes respectively, or may be formed by a physical vapor deposition process. The materials of the first inorganic encapsulation film layer 41 and the second inorganic encapsulation film layer 43 may be selected from inorganic materials such as silicon nitride and silicon oxide; the organic encapsulation film layer 42 is manufactured by an inkjet printing process, or may be formed by a spraying process. The materials of the organic encapsulation film layer 42 may be acrylic-based polymers, silicon-based polymers, and the like.

[0060] Reference Figure 4 As shown, in one embodiment, the display panel further includes a color filter layer 50 , which is disposed on a side of the encapsulation layer away from the substrate 10 , that is, the color filter layer 50 is disposed on a side of the light-emitting layer away from the substrate 10 .

[0061] Specifically, the color film layer 50 may include a black matrix 51 and a plurality of color resist blocks 52. The black matrix 51 may define a plurality of openings B on the substrate 10, and the plurality of color resist blocks 52 are respectively located in different openings B, and the openings correspond to the opening regions A one by one. It can be understood that the plurality of color resist blocks 52 may include a red color resist block 52, a green color resist block 52, and a blue color resist block 52. The light emitted by the light-emitting portion 33 located in the opening region A will pass through the opening B. At this time, the color resist blocks 52 of different colors located in the opening B will filter the color of the light, so that different opening regions A emit light of different colors, thereby realizing the display of color image content. The black matrix 51 can isolate different color resist blocks 52, thereby preventing the light of different opening regions A from affecting each other. The material of the black matrix 51 can be selected as a black resin material.

[0062] At the same time, the orthographic projection of the opening region A on the substrate 10 is located within the orthographic projection of the opening B on the substrate 10, that is, the area of the opening region A is smaller than the area of the opening B, which can effectively increase the light transmittance, thereby improving the display effect of the display panel.

[0063] In other words, the orthographic projection of the black matrix 51 on the substrate 10 is located within the orthographic projection of the pixel defining layer 32 on the substrate 10. Therefore, external light will enter the display panel through the opening B and be reflected by the second pixel defining layer 32 covering the pixel defining layer 32.

[0064] Refer to Figure 4 As shown, in one embodiment, the orthographic projection of the first stepped structure 321 on the substrate 10 and the orthographic projection of the opening B on the substrate 10 at least partially overlap. Specifically, the position of the first stepped structure 321 and the opening B partially overlap. Thus, the light incident into the display panel through the opening B will be reflected by the second pixel electrode 34 covering the first stepped structure 321. And because the slope angle of the second sub-stepped structure 321b in the first stepped structure 321 is relatively large, the light will not be reflected into the opening region A, thereby reducing the phenomenon of light diffraction and improving the color separation phenomenon of the display panel.

[0065] Refer to Figure 4As shown, in one embodiment, the orthographic projection of the second sub-step 321b on the substrate 10 and the orthographic projection range of the part where the opening B exceeds the corresponding opening area A on the substrate 10 overlap at least partially. Specifically, in this embodiment, the part where the opening B exceeds the corresponding opening area A is also the part of the opening B that overlaps with the pixel defining layer 32. The orthographic projection of the second sub-step 321b on the substrate 10 overlaps with the orthographic projection of this part on the substrate 10, so that the light incident from this part into the display panel can be better reflected by the second pixel electrode 34 covering the second sub-step 321b. And because the slope angle of the second sub-step 321b in the first step structure 321 is relatively large, the light will not be reflected into the opening area A, thereby reducing the phenomenon of light diffraction and improving the color separation phenomenon of the display panel.

[0066] In the related art, the edge position of the color resist block 52 in the color filter layer 50 covers the black matrix 51, and the color resist block 52 at this position will also reflect the light incident into the display panel into the opening area A, forming light diffraction and causing the color separation phenomenon of the display panel.

[0067] Therefore, referring to Figure 4 As shown, in an alternative embodiment, the embodiment of the present application further provides a display panel. In this display panel, the black matrix 51 includes a plurality of second step structures 511, and the orthographic projection of the second step structure 511 on the substrate 10 is adjacent to the opening B.

[0068] Specifically, the second step structures 511 correspond to the openings B one by one, and the second structures are distributed along the circumferential direction of the openings B. The second step structure 511 includes a connected third sub-step 511a and a fourth sub-step 511b. The third sub-step 511a is closer to the opening B, and the relative height of the fourth sub-step 511b is higher than that of the third sub-step 511a.

[0069] In the embodiment of the present application, the sum of the sizes of the third sub-step 511a and the fourth sub-step 511b in the normal direction of the display panel is greater than the size of the color resist block 52 in the normal direction of the display panel. Among them, the sizes of the third sub-step 511a, the fourth sub-step 511b, and the color resist block 52 in the normal direction of the display panel can be understood as the thicknesses of the third sub-step 511a, the fourth sub-step 511b, and the color resist block 52. That is to say, the sum of the thicknesses of the third sub-step 511a and the fourth sub-step 511b is greater than the thickness of the color resist block 52. In this way, the second step structure 511 can block the light reflected by the edge of the color resist block 52, thereby reducing the phenomenon of light diffraction.

[0070] In an embodiment of the present application, the third sub-step 511a and the fourth sub-step 511b of the second stepped structure 511 can also be realized by the OPC process, that is, by performing OPC design on the pattern of the mask plate, specifically referring to adding a pattern on the mask plate corresponding to the peripheral position of the opening B, and photolithography the black matrix 51 through the mask plate, and finally forming the second stepped structure 511.

[0071] Reference Figure 4 As shown, in one embodiment, the size of the third sub-step 511a in the normal direction of the display panel is smaller than the size of the color resist block 52 in the normal direction of the display panel, and the surface of the fourth sub-step 511b away from the substrate 10 is higher than the surface of the color resist block 52 away from the substrate 10.

[0072] Specifically, in this embodiment, the thickness of the third sub-step 511a is less than the thickness of the color resist block 52, so the edge of the color resist block 52 will still cover the third sub-step 511a, but the fourth sub-step 511b is higher than the color resist block 52, so the fourth sub-step 511b can block the light reflected from the edge of the color resist block 52, thereby reducing the phenomenon of light diffraction and improving the color separation phenomenon of the display panel.

[0073] The height difference between the surface of the fourth sub-step 511b away from the substrate 10 and the surface of the color resist block 52 away from the substrate 10 is greater than or equal to 2.0μm and less than or equal to 3.0μm; exemplarily, the height difference between the surface of the fourth sub-step 511b away from the substrate 10 and the surface of the color resist block 52 away from the substrate 10 can be 2.0μm, 2.3μm, 2.5μm, 2.8μm, or 3.0μm; by setting the height difference between the fourth sub-step 511b and the color resist block 52 within this range, the light reflected from the edge of the color resist block 52 can be effectively blocked without increasing the thickness of the display panel.

[0074] In one embodiment, a third angle is formed between a tangent line of an edge of the third sub-step 511a close to the opening B and the substrate 10, and a fourth angle is formed between a tangent line of an edge of the fourth sub-step 511b close to the opening B and the substrate 10; the angle value of the third angle is substantially equal to the angle value of the fourth angle.

[0075] Specifically, the third included angle formed between the tangent line of the edge of the third sub-step 511a close to the opening B and the substrate 10 can also be understood as the slope angle of the third sub-step 511a, and the fourth included angle formed between the tangent line of the edge of the fourth sub-step 511b close to the opening B and the substrate 10 can also be understood as the slope angle of the fourth sub-step 511b. That is to say, in this embodiment, the slope angle of the third sub-step 511a can be approximately equal to the slope angle of the fourth sub-step 511b (approximately equal means that the slope angle of the third sub-step 511a and the slope angle of the fourth sub-step 511b can be regarded as equal within a certain tolerance). Such a setting can enable the fourth sub-step 511b to better block the light reflected from the edge position of the color resist block 52.

[0076] Through the above display panel provided by the embodiments of the present application, the light incident into the display panel can be reflected to the position of the black matrix 51 by the first stepped structure 321 of the pixel defining layer 32, and the reflected light can be blocked by the second stepped structure 511 of the black matrix 51, thereby reducing the phenomenon of light diffraction, improving the color separation phenomenon of the display panel, and enhancing the display effect of the display panel.

[0077] Figure 5 The flowchart of the steps of a method for manufacturing a display panel is shown. Refer to Figure 5 As shown, the embodiments of the present application also disclose a method for manufacturing a display panel, and the manufacturing method includes:

[0078] Step 201: Provide a substrate 10.

[0079] Specifically, the substrate 10 can be a flexible substrate or a rigid substrate. When the substrate 10 is a flexible substrate, the display panel can have properties such as bendability or foldability; when the substrate 10 is a rigid substrate, the rigid requirements of the display panel can be met; the properties of the specific substrate 10 are determined according to the actual requirements of the product.

[0080] Step 202: Form a pixel defining layer 32 on one side of the substrate 10, and the pixel defining layer 32 defines a plurality of opening regions A on the substrate 10.

[0081] Specifically, the pixel defining layer 32 can be made of an organic material, such as an organic material like photoresist.

[0082] Step 203: Expose the peripheral position of the pixel defining layer 32 adjacent to the opening region A through a mask plate process to form a plurality of first stepped structures 321.

[0083] Specifically, the first stepped structure 321 includes a first sub-stepped portion 321a and a second sub-stepped portion 321b that are connected to each other, and the first sub-stepped portion 321a is closer to the opening region A. It can be understood that both the first sub-stepped portion 321a and the second sub-stepped portion 321b are part of the pixel defining layer 32, and the relative height of the first sub-stepped portion 321a is lower than that of the second sub-stepped portion 321b.

[0084] Meanwhile, a first included angle is formed between the tangent line of the edge of the first sub-stepped portion 321a on the side close to the opening region A and the substrate 10, and a second included angle is formed between the tangent line of the edge of the second sub-stepped portion 321b on the side close to the opening region A and the substrate 10, and the angular value of the first included angle is smaller than that of the second included angle.

[0085] Since the first sub-stepped portion 321a is adjacent to the opening region A, and a light-emitting portion 33 is to be formed in the opening region A, the slope of the first sub-stepped portion 321a is small, so that the first sub-stepped portion 321a can isolate the light-emitting portion 33 within the opening region A; while the slope of the second sub-stepped portion 321b is large. When the light incident into the display panel reaches the second sub-stepped portion 321b, the cathode covering the second sub-stepped portion 321b will reflect the light to the position between the opening regions A. In this way, diffraction will not occur between the light reflected by the cathode and the light emitted by the light-emitting portion 33, thereby improving the color separation phenomenon of the display panel and enhancing the display effect of the display panel.

[0086] In step 203, the pattern of the mask plate needs to be designed. Specifically, referring to Figure 6 As shown, in the embodiment of the present application, a plurality of openings are formed in the portion of the mask plate 60 corresponding to the peripheral position of the opening region A, and the opening size corresponding to the position of the first sub-stepped portion 321a is larger than the opening size corresponding to the position of the second sub-stepped portion 321b. Since the slope angle of the second sub-stepped portion 321b needs to be greater than that of the first sub-stepped portion 321a, the exposure degree required for the first sub-stepped portion 321a is greater than that required for the second sub-stepped portion 321b. Therefore, the opening size corresponding to the position of the first sub-stepped portion 321a is larger than the opening size corresponding to the position of the second sub-stepped portion 321b.

[0087] Among them, the plurality of openings are evenly distributed on the mask plate 60, and the shape of the openings may include square, circular, strip-shaped or polygonal, and those skilled in the art can set according to actual needs.

[0088] Based on the same inventive concept, the embodiment of the present application discloses a display device, including any one of the display panels as described above in the embodiment of the present application.

[0089] Specifically, the display device may include a computer monitor, a television, a billboard, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a laptop computer, a digital camera, a portable video camera, a viewfinder, a vehicle, a large wall, a screen in a theater, or a stadium sign, etc.

[0090] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0091] It should also be noted that in this text, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present application. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or terminal device including the element.

[0092] The technical solutions provided by the present application have been introduced in detail above. Specific examples are used in this text to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only for helping to understand the present application, and the content of this specification should not be understood as a limitation to the present application. At the same time, for those of ordinary skill in the art, based on the present application, there will be various forms of changes in the specific implementation manners and application scopes. It is not necessary and impossible to list all the implementation manners here, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A pixel defining layer is disposed on one side of the substrate, and the pixel defining layer defines a plurality of opening areas on the substrate, and the pixel defining layer includes a plurality of first step structures, and the orthographic projections of the first step structures on the substrate are adjacent to the opening areas; Among them, the first step structure includes a first sub-step and a second sub-step connected to each other, the first sub-step is closer to the opening area, a first angle is formed between the tangent of the edge of the first sub-step close to the opening area and the substrate, and a second angle is formed between the tangent of the edge of the second sub-step close to the opening area and the substrate, and the angle value of the first angle is smaller than the angle value of the second angle.

2. The display panel according to claim 1, characterized in that: The first stepped structures are distributed along the circumference of the opening area.

3. The display panel according to claim 1, wherein: The angle value of the first angle is greater than or equal to 20° and less than or equal to 30°.

4. The display panel according to claim 1, wherein: The angle value of the second angle is greater than or equal to 70° and less than or equal to 80°.

5. The display panel according to claim 1, wherein: The display panel further comprises a color filter layer arranged on a side of the pixel defining layer away from the substrate; The color filter layer includes a black matrix and a plurality of color resist blocks, the black matrix defines a plurality of openings on the substrate, the plurality of color resist blocks are respectively located in different openings, and the openings correspond to the opening areas one by one; The orthographic projection of the opening region on the substrate is located within the orthographic projection range of the opening on the substrate.

6. The display panel according to claim 5, characterized in that: An orthographic projection of the first stepped structure on the substrate at least partially overlaps with an orthographic projection of the opening on the substrate.

7. The display panel according to claim 6, characterized in that: An orthographic projection of the second sub-step on the substrate at least partially overlaps with an orthographic projection range of a portion of the opening that exceeds the corresponding opening area on the substrate.

8. The display panel according to claim 5, characterized in that: The black matrix includes a plurality of second stepped structures, and the orthographic projections of the second stepped structures on the substrate are adjacent to the openings; Among them, the third sub-step and the fourth sub-step are interconnected in the second step structure, the third sub-step is closer to the opening, and the sum of the sizes of the third sub-step and the fourth sub-step in the normal direction of the display panel is greater than the size of the color resist block in the normal direction of the display panel.

9. The display panel according to claim 8, characterized in that: The dimension of the third sub-step in the normal direction of the display panel is smaller than the dimension of the color resist block in the normal direction of the display panel, and the surface of the fourth sub-step away from the substrate is higher than the surface of the color resist block away from the substrate.

10. The display panel according to claim 9, characterized in that: A height difference between a surface of the fourth sub-step away from the substrate and a surface of the color resist block away from the substrate is greater than or equal to 2.0 μm and less than or equal to 3.0 μm.

11. The display panel according to claim 8, characterized in that: A third angle is formed between a tangent line of an edge of the third sub-step close to the opening and the substrate, and a fourth angle is formed between a tangent line of an edge of the fourth sub-step close to the opening and the substrate; The angle value of the third angle is substantially equal to the angle value of the fourth angle.

12. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-11.

13. A method for preparing a display panel, characterized in that: The preparation method comprises: providing a substrate; A pixel defining layer is formed on one side of the substrate, wherein the pixel defining layer defines a plurality of opening areas on the substrate; Exposing the peripheral position of the pixel definition layer adjacent to the opening area through a mask process to form a plurality of first step structures; Among them, the first step structure includes a first sub-step and a second sub-step connected to each other, the first sub-step is closer to the opening area, a first angle is formed between the tangent of the edge of the first sub-step close to the opening area and the substrate, and a second angle is formed between the tangent of the edge of the second sub-step close to the opening area and the substrate, and the angle value of the first angle is smaller than the angle value of the second angle.

14. The method for preparing a display panel according to claim 13, wherein: The mask plate is provided with a plurality of openings at peripheral positions, and the size of the openings corresponding to the first sub-step positions is larger than the size of the openings corresponding to the second sub-step positions.

15. The method for manufacturing a display panel according to claim 14, characterized in that: The shapes of the openings include square, circle, strip or polygon.

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