Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device. The display panel comprises a substrate; the plurality of sub-pixels are distributed on one side of the substrate in an array manner; each sub-pixel comprises a driving circuit and a reflecting electrode coupled with the driving circuit, and the reflecting electrode is arranged on the side, away from the substrate, of the driving circuit; wherein the driving circuit comprises a height compensation pattern, and a compensation overlapping area exists between the orthographic projection of the height compensation pattern on the substrate and the orthographic projection of the reflection electrodes of at least part of the sub-pixels on the substrate, so that the inclination angles of all the reflection electrodes relative to the substrate are the same. According to the display panel, the preparation method thereof and the display device provided by the invention, the local height of the reflection electrode above the height compensation pattern can be adjusted through the height compensation pattern, so that the inclination angle of the reflection electrode relative to the substrate is changed, and the inclination angles of all the reflection electrodes in the display panel are the same; therefore, the problem of line light source color separation of the display panel is solved.

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] AMOLED display products have the advantages of wide color gamut, high resolution, and individual control of each pixel. Their application range in terminals is expanding, especially AMOLED large-size display panels, which account for an increasingly higher share in the terminal market, such as large-screen mobile phones, laptops, and vehicle instrument displays. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a display panel and a manufacturing method thereof, and a display device.

[0004] Based on the above-mentioned purpose, the first aspect of the present application provides a display panel, comprising: a substrate; a plurality of sub-pixels, wherein an array portion is arranged on one side of the substrate; each of the sub-pixels comprises a driving circuit, and a reflecting electrode coupled to the driving circuit, wherein the reflecting electrode is arranged on a side of the driving circuit away from the substrate; wherein the driving circuit comprises a height compensation pattern, wherein the orthographic projection of the height compensation pattern on the substrate is defined as a compensation projection, wherein there exists a compensation overlapping area between the compensation projection and the orthographic projection of the reflecting electrode of at least part of the sub-pixels on the substrate, and the height compensation pattern is used to make the inclination angles of all the reflecting electrodes relative to the substrate the same.

[0005] Based on the same inventive concept, the second aspect of the present application further provides a method for preparing a display panel, the method comprising:

[0006] providing a substrate base plate;

[0007] forming a plurality of array-distributed drive circuits on one side of the substrate, wherein the drive circuits include a height compensation pattern;

[0008] forming a reflective electrode on a side of the driving circuit away from the base substrate;

[0009] The orthographic projection of the height compensation pattern on the base substrate and the orthographic projection of at least part of the reflective electrode on the base substrate have a compensation overlap area, and the height compensation pattern is used to make the inclination angles of all the reflective electrodes relative to the base substrate the same.

[0010] Based on the same inventive concept, the third aspect of the present application further provides a display device, comprising the display panel as described in the first aspect.

[0011] From the above description, it can be seen that the display panel and its preparation method, and the display device provided by the present application are provided with a height compensation pattern in the driving circuit. The height compensation pattern can be used to adjust the local height of the reflective electrode above it, thereby changing the inclination angle of the reflective electrode relative to the base substrate, so that the inclination angles of all reflective electrodes in the display panel relative to the base substrate are the same, thereby improving the problem of color separation of line light sources in the display panel.

[0012] At the same time, since the surface height of the reflective electrode can be locally adjusted through the height compensation pattern, the process requirements for the flatness of the reflective electrode surface can be reduced, which helps to reduce the difficulty of preparing the display panel, improve the yield of the display panel, and facilitate mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 A schematic diagram of a display panel of a first structure according to an embodiment of the present application;

[0015] Figure 2 A schematic top view of a display panel of a first structure according to an embodiment of the present application;

[0016] Figure 3a A schematic top view of a first sub-pixel of a display panel having a first structure according to an embodiment of the present application;

[0017] Figure 3b A schematic top view of a second sub-pixel of a display panel having a first structure according to an embodiment of the present application;

[0018] Figure 4 A schematic diagram of an actual stacking structure of G sub-pixels of a display panel having a first structure according to an embodiment of the present application;

[0019] Figure 5 A schematic diagram of an actual stacking structure of R sub-pixels of a display panel of the first structure according to an embodiment of the present application;

[0020] Figure 6 A schematic diagram of an actual stacking structure of a B sub-pixel of a display panel having a first structure according to an embodiment of the present application;

[0021] Figure 7 A schematic diagram of a first reflective electrode of a display panel of a first structure according to an embodiment of the present application reflecting light to form a virtual image;

[0022] Figure 8 A schematic diagram of a second reflective electrode of a display panel of a first structure according to an embodiment of the present application reflecting light to form a virtual image;

[0023] Fig. 9 A schematic diagram of sub-pixel distribution of a display panel according to an embodiment of the present application;

[0024] Fig.10 A schematic diagram of a display panel of a second structure according to an embodiment of the present application;

[0025] Fig.11 A schematic diagram of a display panel of a third structure according to an embodiment of the present application;

[0026] Fig.12 is a schematic diagram of a display panel of a fourth structure according to an embodiment of the present application;

[0027] Fig.13 is a schematic diagram of a display panel of a fifth structure according to an embodiment of the present application;

[0028] Fig.14 A schematic diagram of a process for preparing a display panel according to an embodiment of the present application;

[0029] Fig.15 A schematic diagram of a patterning process for a photosensitive material layer during the preparation of a display panel according to an embodiment of the present application;

[0030] Fig.16 It is a schematic diagram of forming a height compensation pattern during the preparation process of the display panel according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0032] It should be noted that the relative arrangement of the components, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

[0033] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0035] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] In the related art, in order to prevent reflection, OLED display panels need to use polarizers (POL) in the stacking structure of the module (MDL) to reduce the reflection intensity of external ambient light on the display panel. However, the polarizer will increase the stacking thickness of the module, which will make the display panel difficult to bend and fold, and cannot meet the needs of curved display products or folding display products.

[0037] In order to reduce the stacking thickness of the module, in some embodiments, a polarizing film is no longer provided in the display panel, but a color film is provided on the light-emitting side of the light-emitting element, namely, a COE (Color Filter on Encapsulation) structure. The COE structure can effectively improve the transmittance of the module and reduce the power consumption of the light-emitting element. At the same time, as the stacking thickness of the module is reduced, not only will the bending performance of the display panel be improved, but the difficulty of laminating the module will also be reduced, which can provide technical support for the development of foldable and curled display devices.

[0038] However, the applicant has found that even if the display panel adopts a COE structure, there is still a risk of green-purple color separation of the line light source when the display panel is illuminated by ambient light.

[0039] The applicant has found through research that the above problems in the display panel are related to the layout of the signal lines in the display panel.

[0040] Specifically, Figure 1The display panel may include a substrate 100, a buffer layer 200 (Buffer) is disposed on one side of the substrate 100, a semiconductor layer 300 is disposed on the side of the buffer layer 200 away from the substrate 100, and the semiconductor layer 300 may include a pattern for forming an active layer of a transistor in a driving circuit. The buffer layer 200 may prevent or reduce the diffusion of metal atoms and / or impurities from the substrate 100 into the semiconductor layer 300.

[0041] A first gate layer 500 is disposed on a side of the semiconductor layer 300 away from the base substrate 100. The first gate layer 500 may include a pattern for forming a gate electrode of a transistor, and may also include a pattern for forming a first electrode plate of a storage capacitor in a driving circuit. The display panel further includes a gate insulating layer 400, i.e., a first gate insulating layer 410, disposed between the semiconductor layer 300 and the first gate layer 500.

[0042] A second gate layer 600 is disposed on a side of the first gate layer 500 away from the base substrate 100. The second gate layer 600 may include a pattern for forming a second electrode plate of a storage capacitor. The display panel further includes a gate insulating layer 400 disposed between the first gate layer 500 and the second gate layer 600, that is, a second gate insulating layer 420.

[0043] An interlayer insulating layer 700 is disposed on the side of the second gate layer 600 away from the base substrate 100, and a first source-drain electrode layer 800 is disposed on the side of the interlayer insulating layer 700 away from the base substrate 100. The first source-drain electrode layer 800 may include a pattern for forming a source electrode and a drain electrode of a transistor, and the pattern is connected to a pattern for forming an active layer through a via hole. The first source-drain electrode layer 800 may also include a wiring pattern 810, and the wiring pattern 810 may be connected to a pattern for forming a first electrode plate of a storage capacitor through a via hole.

[0044] A planar layer 900 is disposed on the side of the first source-drain electrode layer 800 away from the base substrate 100, and a first electrode layer 1000 is disposed on the side of the planar layer 900 away from the base substrate 100. The first electrode layer 1000 includes a reflective electrode 1100 for forming a light-emitting element of a sub-pixel 1300. The reflective electrode 1100 can be electrically connected to the drain electrode of the transistor through a via hole. Exemplarily, the reflective electrode 1100 can serve as an anode of the light-emitting element.

[0045] A pixel defining layer 1200 is disposed on a side of the first electrode layer 1000 away from the base substrate 100. The pixel defining layer 1200 is provided with a pixel opening 1210 corresponding to the sub-pixel 1300, and at least a portion of the reflective electrode 1100 is exposed through the pixel opening 1210. A light-emitting layer for forming a light-emitting element is disposed in the pixel opening 1210, and the light-emitting layer can be electrically connected to the reflective electrode 1100 below.

[0046] It should be noted that in the display panel, the array has a plurality of sub-pixels 1300, each of which includes a driving circuit and a light-emitting element connected to the driving circuit. The plurality of sub-pixels 1300 can emit light of different colors, for example, the plurality of sub-pixels 1300 can include a B sub-pixel capable of emitting blue light, an R sub-pixel capable of emitting red light, and a G sub-pixel capable of emitting green light.

[0047] The applicant has found that the structures of the first source-drain electrode layer 800 corresponding to different sub-pixels 1300 in the display panel are different. Figure 2 , the green pattern in the figure is the pattern of the first source-drain electrode layer 800, and the light blue circular area is the reflective electrode 1100 of the sub-pixel 1300. It can be seen that the patterns of the first source-drain electrode layer 800 corresponding to the R sub-pixel and the B sub-pixel are roughly the same, while the pattern of the first source-drain electrode layer 800 corresponding to the G sub-pixel is different from the above two.

[0048] Based on the above structural characteristics, the G sub-pixel may be referred to as the first sub-pixel 1310. In order to more clearly reflect the above structure, Figure 3a The structure of the first sub-pixel 1310 is simplified. The R sub-pixel and the B sub-pixel may be referred to as the second sub-pixel 1320. Figure 3b The structure of the second sub-pixel 1320 is simplified.

[0049] by Figure 3a and Figure 3b The structure and direction are taken as an example to further illustrate.

[0050] like Figure 3a The wiring pattern 810 corresponding to the first sub-pixel 1310 can be referred to as a first wiring pattern 811, and the reflective electrode 1100 of the first sub-pixel 1310 can be referred to as a first reflective electrode 1110. The first wiring pattern 811 is arranged on the upper side of a region (hereinafter referred to as an exposed region) corresponding to the first reflective electrode 1110 and the pixel opening 1210, so that there is a relatively obvious height difference between the surface close to the upper edge and the surface close to the lower edge of the exposed region of the first reflective electrode 1110, and the height difference causes the first reflective electrode 1110 to be inclined at a certain angle relative to the base substrate 100.

[0051] Figure 4 is a schematic diagram of an actual stacking structure of the first sub-pixel 1310 . It can be seen that the surface of the first reflective electrode 1110 is obviously inclined relative to the horizontal dotted line.

[0052] like Figure 3b The routing pattern 810 corresponding to the second sub-pixel 1320 can be called a second routing pattern 812, and the reflective electrode 1100 of the second sub-pixel 1320 can be called a second reflective electrode 1120. The second routing pattern 812 is roughly arranged in the middle of the exposed area of ​​the second reflective electrode 1120, so that there is no obvious height difference between the surface close to the upper edge and the surface close to the lower edge of the exposed area of ​​the second reflective electrode 1120. Accordingly, the second reflective electrode 1120 does not tilt relative to the base substrate 100.

[0053] Figure 5 is a schematic diagram of an actual stacking structure of an R sub-pixel in the second sub-pixel 1320 . It can be seen that, relative to the horizontal dotted line, the surface of the second reflective electrode 1120 corresponding to the R sub-pixel is not obviously inclined. Figure 6 is a schematic diagram of an actual stacking structure of a B sub-pixel in the second sub-pixel 1320 . It can be seen that, relative to the horizontal dotted line, the surface of the second reflective electrode 1120 corresponding to the B sub-pixel has no obvious inclination.

[0054] Based on the structure of the first reflective electrode 1110 and the second reflective electrode 1120 of the display panel, as shown in FIG. Figure 7 For the first sub-pixel 1310, after the external ambient light 1500 passes through the color filter layer 1400 and irradiates the surface of the first reflective electrode 1110, due to the tilt of the surface of the first reflective electrode 1110, the virtual image 1600a formed by the reflected light will shift to one side of the first reflective electrode 1110.

[0055] like Figure 8 For the second sub-pixel 1320, after the external ambient light 1500 passes through the color filter layer 1400 and irradiates the surface of the second reflective electrode 1120, since the surface of the second reflective electrode 1120 is relatively flat, the virtual image 1600b formed by the reflection has no obvious offset relative to the second reflective electrode 1120. Therefore, the virtual image 1600a formed by the reflection of the first sub-pixel 1310 and the virtual image 1600b formed by the reflection of the second sub-pixel 1320 are difficult to overlap, resulting in the display panel having green and purple color separation of the line light source.

[0056] Fig. 9 A schematic diagram of a display panel viewed from above is shown. Fig. 9 The distribution mode and direction of the R sub-pixel, B sub-pixel and G sub-pixel shown in FIG. 8 are used as an example to illustrate that the wiring pattern 810 is located at the lower left side of the G sub-pixel (ie, Fig. 9As a result, the surface of the reflective electrode of the G sub-pixel is higher at the lower left side and lower at the upper right side, that is, the reflective electrode of the G sub-pixel is directionally tilted.

[0057] The applicant has found that the root cause of the above problem in the display panel is not the tilt of the first reflective electrode 1110, but the inconsistency of the tilt angles of the first reflective electrode 1110 and the second reflective electrode 1120. In other words, whether the tilt angle of the first reflective electrode 1110 is made close to the tilt angle of the second reflective electrode 1120 (i.e., the tilted first reflective electrode 1110 is adjusted to be non-tilted), or the tilt angle of the second reflective electrode 1120 is made close to the tilt angle of the first reflective electrode 1110 (i.e., the non-tilted second reflective electrode 1120 is adjusted to be tilted), the green-purple color separation problem of the line light source of the display panel can be improved.

[0058] In view of this, if Fig.10 , Fig.11 and Fig.12 The present embodiment provides a display panel, comprising: a substrate 100; a plurality of sub-pixels 1300, the array being arranged on one side of the substrate 100; each sub-pixel 1300 comprising a driving circuit and a reflective electrode 1100 coupled to the driving circuit, the reflective electrode 1100 being arranged on a side of the driving circuit away from the substrate 100; wherein the driving circuit comprises a height compensation pattern 1700, the orthographic projection of the height compensation pattern 1700 on the substrate 100 being defined as a compensation projection, the compensation projection and the orthographic projection of the reflective electrode 1100 of at least part of the sub-pixels 1300 on the substrate 100 having a compensation overlapping region, the height compensation pattern 1700 being used to make the inclination angles of all the reflective electrodes 1100 relative to the substrate 100 (hereinafter referred to as the inclination angles of the reflective electrodes 1100) the same.

[0059] Exemplarily, the reflective electrode 1100 may be an anode, and a surface of the anode away from the base substrate 100 may reflect light.

[0060] Exemplarily, the material of the height compensation pattern 1700 may be the same as the material of the structural layer disposed at the same layer. For example, when the height compensation pattern 1700 is disposed at the same layer as the first source-drain electrode layer 800, the material of the height compensation pattern 1700 is the same as the material forming the first source-drain electrode layer 800. Alternatively, the material of the height compensation pattern 1700 may also be different from the material of the structural layer disposed at the same layer. For example, the height compensation pattern 1700 may be prepared using a material used to form a black matrix (BM).

[0061] In combination with the foregoing, it can be known that the reason why the reflective electrode 1100 is tilted is due to the height difference between different areas of the same reflective electrode 1100. In this embodiment, when the inclination angles of the reflective electrodes 1100 corresponding to the sub-pixels 1300 in the display panel are different, the height compensation pattern 1700 can be set at the position of the target sub-pixel 1300. In the target sub-pixel 1300, the surface of the area of ​​its reflective electrode 1100 that overlaps with the height compensation pattern 1700 in space will rise, thereby changing the inclination angle of the reflective electrode 1100 of the target sub-pixel 1300, until the inclination angles of the reflective electrodes 1100 of all sub-pixels 1300 are adjusted to the same. At this time, when the external ambient light enters the display panel, the virtual images 1600 formed by the reflections of the reflective electrodes 1100 of the sub-pixels 1300 of different colors can overlap,

[0062] In the display panel provided by the embodiment of the present application, a height compensation pattern 1700 is arranged in the driving circuit. The height compensation pattern 1700 can be used to adjust the local height of the reflective electrode 1100 above it, thereby changing the inclination angle of the reflective electrode 1100 relative to the base substrate 100, so that the inclination angles of all the reflective electrodes 1100 in the display panel relative to the base substrate 100 are the same, thereby improving the problem of color separation of line light sources in the display panel.

[0063] At the same time, since the surface height of the reflective electrode 1100 can be locally adjusted through the height compensation pattern 1700, the process requirements for the flatness of the surface of the reflective electrode 1100 can be reduced, which helps to reduce the difficulty of manufacturing the display panel, improve the yield of the display panel, and facilitate mass production.

[0064] The following is a detailed description of how the tilt angle of the reflective electrode 1100 is adjusted by the height compensation pattern 1700 .

[0065] like Figure 1 The sub-pixel 1300 includes a first sub-pixel 1310 (e.g., a G sub-pixel) and a second sub-pixel 1320 (e.g., an R sub-pixel or a B sub-pixel), and the reflective electrode 1100 includes a first reflective electrode 1110 corresponding to the first sub-pixel 1310 and a second reflective electrode 1120 corresponding to the second sub-pixel 1320; the orthographic projection of the first reflective electrode 1110 on the base substrate 100 is defined as a first electrode projection, and the orthographic projection of the second reflective electrode 1120 on the base substrate 100 is defined as a second electrode projection.

[0066] The driving circuit includes an interlayer insulating layer 700, and a first source-drain electrode layer 800 disposed on a side of the interlayer insulating layer 700 away from the base substrate 100; the first source-drain electrode layer 800 includes a first wiring pattern 811, and the orthographic projection of the first wiring pattern 811 on the base substrate 100 is defined as a first wiring projection; there is a first overlapping area near the edge of the first wiring projection and the first electrode projection. Figure 1 In the direction shown, the first wiring pattern 811 is located below the right edge of the first reflective electrode 1110. Under the action of the first wiring pattern 811, the first reflective electrode 1110 is tilted toward the left, and the angle between the first wiring pattern 811 and the base substrate 100 is an angle a.

[0067] Exemplarily, for the first reflective electrode 1110 , the height of the lower side away from the IC is greater than the height of the lower side close to the IC, resulting in the first reflective electrode 1110 being tilted toward the IC.

[0068] like Figure 1 The first source-drain electrode layer 800 further includes a second wiring pattern 812. The orthographic projection of the second wiring pattern 812 on the base substrate 100 is defined as a second wiring projection. There is a second overlapping region between the second wiring projection and the middle of the second electrode projection. Since the second wiring pattern 812 is located below the middle of the second reflective electrode 1120, the second reflective electrode 1120 is not obviously tilted.

[0069] In order to make the first reflective electrode 1110 and the second reflective electrode 1120 have the same inclination angle, as shown in FIG. Fig.10 , Fig.11 and Fig.12 In some embodiments, the compensation projection has a compensation overlapping area with at least the second electrode projection.

[0070] Exemplarily, the compensation projection may be entirely located within the second electrode projection.

[0071] Exemplarily, a portion of the compensation projection may be located within the second electrode projection and another portion may be located outside the second electrode projection. Furthermore, the portion of the compensation projection located outside the second electrode projection may overlap with the first electrode projection or may not overlap with the first electrode projection.

[0072] In this embodiment, the height compensation pattern 1700 in the compensation overlapping area is located directly below the second reflective electrode 1120. Under the action of this part of the height compensation pattern 1700, the second reflective electrode 1120 can also be tilted, and the tilt angle is the same as the tilt angle of the first reflective electrode 1110, thereby improving the problem of linear light source color separation in the display panel.

[0073] It should be noted that, in this embodiment, compared with a display panel (such as Figure 1 Compared with the display panel shown in FIG. 1 , the tilt angle of the first reflective electrode 1110 may change (i.e., the compensation projection overlaps with the first electrode projection) or may not change (i.e., the compensation projection does not overlap with the first electrode projection). However, both the first reflective electrode 1110 and the second reflective electrode 1120 need to have the same tilt angle.

[0074] like Fig.10 and Fig.11 In some embodiments, the compensation projection only has a compensation overlap region with the second electrode projection, and the position of the compensation overlap region relative to the second electrode projection is the same as the position of the first overlap region relative to the first electrode projection.

[0075] Since the inclination angle of the first reflective electrode 1110 is strongly correlated with the first routing pattern 811, the position of the height compensation pattern 1700 relative to the second reflective electrode 1120 can be designed according to the position of the first routing pattern 811 relative to the first reflective electrode 1110, so that the effect of the height compensation pattern 1700 on the second reflective electrode 1120 is more similar to the effect of the first routing pattern 811 on the first reflective electrode 1110, thereby making it easier to make the inclination angles of the first reflective electrode 1110 and the second reflective electrode 1120 the same.

[0076] Meanwhile, since the height compensation pattern 1700 of the present embodiment is only disposed at the position corresponding to the second reflective electrode 1120 , the material cost of disposing the height compensation pattern 1700 can be reduced, which is beneficial to mass production.

[0077] In some embodiments, the area of ​​the compensating overlap region is the same as the area of ​​the first overlap region.

[0078] In order to further make the effect of the height compensation pattern 1700 on the second reflective electrode 1120 more similar to the effect of the first routing pattern 811 on the first reflective electrode 1110, the present embodiment designs the outer shape structure of the height compensation pattern 1700 according to the outer shape structure of the first routing pattern 811, thereby making it easier to make the inclination angles of the first reflective electrode 1110 and the second reflective electrode 1120 the same.

[0079] like Fig.10 In some embodiments, the height compensation pattern 1700 is disposed in the same layer as the first source and drain electrode layer 800 .

[0080] The height compensation pattern 1700 may be formed while the first source-drain electrode layer 800 is being prepared, so that the difficulty in preparing the display panel due to the provision of the height compensation pattern 1700 may be avoided.

[0081] Meanwhile, in combination with the above content, it can be known that the inclination of the first reflective electrode 1110 is caused by the first wiring pattern 811. The height compensation pattern 1700 is arranged in the same layer as the first source and drain electrode layer 800 where the first wiring pattern 811 is located, so that the effect of the height compensation pattern 1700 on the second reflective electrode 1120 is more similar to the effect of the first wiring pattern 811 on the first reflective electrode 1110, thereby making it easier to make the inclination angles of the first reflective electrode 1110 and the second reflective electrode 1120 the same.

[0082] like Fig.10 In some embodiments, the height compensation pattern 1700 and the first source-drain electrode layer 800 are separated from each other.

[0083] Although the height compensation pattern 1700 is disposed in the first source-drain electrode layer 800 , it is not connected to the original pattern in the first source-drain electrode layer 800 , so as to reduce the influence of the height compensation pattern 1700 on the original driving circuit.

[0084] like Fig.11 In some embodiments, the driving circuit includes a first gate layer 500 disposed between the first source-drain electrode layer 800 and the base substrate 100 , and the height compensation pattern 1700 is disposed between the first gate layer 500 and the first source-drain electrode layer 800 .

[0085] Exemplarily, the height compensation pattern 1700 may be disposed in the same layer as the second gate layer 600 .

[0086] Exemplarily, the height compensation pattern 1700 may be disposed between the first gate layer 500 and the second gate insulating layer 420 .

[0087] In addition to setting the height compensation pattern 1700 on the first source-drain electrode layer 800, it can also be set below the first source-drain electrode layer 800. However, if the height compensation pattern 1700 is set too close to the base substrate 100, the height influence of the height compensation pattern 1700 on the structural layer above it will continue to decrease as the number of stacked structural layers increases, and it is difficult to play a role in height compensation for the second reflective electrode 1120. At the same time, if the height compensation pattern 1700 is set between the first gate layer 500 and the semiconductor layer 300, it may also affect the electrical performance of the driving circuit.

[0088] In order to avoid the above problems, in this embodiment, the height compensation pattern 1700 is arranged between the first gate layer 500 and the first source and drain layer 800, which can ensure that the height compensation pattern 1700 can produce a height compensation effect on the second reflective electrode 1120, thereby making it easier to make the inclination angles of the first reflective electrode 1110 and the second reflective electrode 1120 the same; and it can also avoid the setting of the height compensation pattern 1700 to affect other wirings or devices in the driving circuit.

[0089] like Fig.11 In some embodiments, the height compensation pattern 1700 is disposed between the first gate layer 500 and the second gate insulation layer 420 .

[0090] Exemplarily, the material of the height compensation pattern 1700 may be the same as that of the first gate layer 500 .

[0091] The height compensation pattern 1700 is disposed between the first gate layer 500 and the second gate insulating layer 420 . The height compensation pattern 1700 can form a multi-layer structure with the first gate layer 500 , thereby making the formation difficulty and cost of the height compensation pattern 1700 lower, which is conducive to mass production.

[0092] like Fig.12 In some embodiments, the compensation overlap area includes a first compensation overlap area and a second compensation overlap area; there is a first compensation overlap area between the compensation projection and the first electrode projection, and there is a second compensation overlap area between the compensation projection and the second electrode projection; wherein the first compensation overlap area does not overlap with the first overlap area, and the second compensation overlap area does not overlap with the second overlap area.

[0093] For example, in this embodiment, the height compensation pattern 1700 may be disposed in the same layer as the first source-drain electrode layer 800 , but the height compensation pattern 1700 and the first source-drain electrode layer 800 are separated from each other.

[0094] In addition to only setting the height compensation pattern 1700 at the corresponding position of the second reflective electrode 1120, the height compensation pattern 1700 can also be set at the corresponding position of the first reflective electrode 1110 and the corresponding position of the second reflective electrode 1120, that is, the surface height and tilt angle of the first reflective electrode 1110, as well as the surface height and tilt angle of the second reflective electrode 1120 are adjusted by setting the height compensation pattern 1700. On the one hand, it is easier to make the tilt angles of the first reflective electrode 1110 and the second reflective electrode 1120 the same. On the other hand, the surface height of the first reflective electrode 1110 and the surface height of the second reflective electrode 1120 can also be adjusted, so that the height difference between the two can more easily meet the process requirements, which is helpful to improve the display quality and yield rate of the display panel.

[0095] The first compensation overlap region does not overlap with the first overlap region, that is, the height compensation pattern 1700 is not connected to the first wiring pattern 811 and there is no spatial overlap. Similarly, the second compensation overlap region does not overlap with the second overlap region, that is, the height compensation pattern 1700 is not connected to the second wiring pattern 812 and there is no spatial overlap. On the one hand, it can avoid the influence of the height compensation pattern 1700 on the electrical properties of the first wiring pattern 811 and the second wiring pattern 812; on the other hand, it can also reduce the interaction between the height compensation pattern 1700 and the first reflective electrode 1110 or the second reflective electrode 1120, thereby affecting the tilt angle of the first reflective electrode 1110 and the second reflective electrode 1120, that is, it helps to reduce the factors that affect the tilt angle of the first reflective electrode 1110 and the second reflective electrode 1120, and facilitates the adjustment of the tilt angle of the first reflective electrode 1110 and the second reflective electrode 1120.

[0096] In some embodiments, the thickness of at least a portion of the height compensation pattern 1700 is positively correlated with the maximum height difference of the surface of the first reflective electrode 1110 .

[0097] In combination with the above content, it can be known that in order to more easily make the first reflective electrode 1110 and the second reflective electrode 1120 have the same inclination angle, the height compensation pattern 1700 can be designed according to the first wiring pattern 811. This method can be reflected not only in the position and projection area of ​​the height compensation pattern 1700, but also in the thickness of the height compensation pattern 1700.

[0098] Specifically, in some embodiments, the thickness of the height compensation pattern 1700 in the first compensation overlap region is HG, the thickness of the height compensation pattern 1700 in the second compensation overlap region is HR, the maximum height difference of the surface of the first reflective electrode 1110 is d, and HR=HG+d.

[0099] For example, when HG=0, HR=d, that is, when the height compensation pattern 1700 is not provided on the first reflective electrode 1110, the thickness of the height compensation pattern 1700 provided at the corresponding position of the second reflective electrode 1120 is the same as the maximum height difference of the surface of the first reflective electrode 1110, so that under the action of the height compensation pattern 1700, the surface of the second reflective electrode 1120 also has the same height difference, thereby making the inclination angles of the first reflective electrode 1110 and the second reflective electrode 1120 the same.

[0100] like Fig.13 In some embodiments, a first planarization layer 910 and a second planarization layer 920 are stacked on a side of the first source / drain electrode layer 800 away from the base substrate 100 , and the height compensation pattern 1700 is disposed between the first planarization layer 910 and the second planarization layer 920 .

[0101] For example, the materials of the first planar layer 910 and the second planar layer 920 may be the same or different.

[0102] The first planar layer 910 can isolate the height compensation pattern 1700 from the first source-drain electrode layer 800, thereby preventing the height compensation pattern 1700 from affecting the electrical properties of the first source-drain electrode layer 800, and reducing the electrical impact of the height compensation pattern 1700 on the driving circuit. Similarly, the second planar layer 920 can isolate the height compensation pattern 1700 from the first electrode layer 1000, thereby preventing the height compensation pattern 1700 from affecting the electrical properties of the first electrode layer 1000, and reducing the electrical impact of the height compensation pattern 1700 on the light-emitting element.

[0103] Based on the same inventive concept and in combination with the description of the display panels of the above embodiments, this embodiment provides a method for preparing a display panel. The method has the corresponding technical effects of the display panels of the above embodiments, which will not be described in detail herein.

[0104] like Fig.14 The method for preparing a display panel provided in this embodiment includes:

[0105] Step S100: providing a substrate.

[0106] Step S200: forming a plurality of driving circuits distributed in an array on one side of the substrate, wherein the driving circuits include a height compensation pattern.

[0107] Exemplarily, the height compensation pattern 1700 may be formed by a patterning process.

[0108] by Fig.15 and Fig.16 Taking the structure shown as an example, after forming an interlayer insulating layer 700 and a first source-drain layer on the base substrate 100, a first planar layer 910 is formed to cover the first source-drain layer and the interlayer insulating layer 700 (the first source-drain layer only covers part of the surface of the interlayer insulating layer 700).

[0109] A photosensitive material layer 1800 for forming a height compensation pattern 1700 is disposed on the already formed first planar layer 910, and the photosensitive material layer 1800 is covered with a mask plate 1900, which has a light-transmitting region 1920 and a light-shielding region 1910, and one of the light-transmitting region 1920 and the light-shielding region 1910 (depending on the properties of the photosensitive material) is consistent with the shape of the height compensation pattern 1700 to be formed. After patterning process steps such as exposure and development, the photosensitive material layer 1800 can form a height compensation pattern 1700 of a preset shape at a preset position on the surface of the first planar layer 910.

[0110] Thereafter, a second planarization layer covering the height compensation pattern 1700 may be formed.

[0111] Step S300, forming a reflective electrode on a side of the driving circuit away from the base substrate, wherein the orthographic projection of the height compensation pattern on the base substrate and the orthographic projection of at least part of the reflective electrode on the base substrate have a compensation overlap area, and the height compensation pattern is used to make the inclination angle of all the reflective electrodes relative to the base substrate the same.

[0112] After the second planar layer is formed, a reflective electrode corresponding to each sub-pixel may be formed on the surface of the second planar layer through a patterning process, and the reflective electrode may be connected to the driving circuit through a via hole.

[0113] Based on the same inventive concept and in combination with the description of the display panels of the above embodiments, this embodiment provides a display device having the corresponding technical effects of the display panels of the above embodiments, which will not be described in detail herein.

[0114] A display device comprises the display panel as described in the above embodiments.

[0115] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims.

[0116] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0117] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0118] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0119] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0120] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that: include: substrate substrate; A plurality of sub-pixels, the array is divided on one side of the substrate; each of the sub-pixels comprises a driving circuit and a reflecting electrode coupled to the driving circuit, the reflecting electrode is arranged on a side of the driving circuit away from the substrate; Wherein, the driving circuit includes a height compensation pattern, the orthographic projection of the height compensation pattern on the substrate is defined as a compensation projection, the compensation projection and the orthographic projection of the reflective electrode of at least part of the sub-pixels on the substrate have a compensation overlapping area, and the height compensation pattern is used to make the inclination angles of all the reflective electrodes relative to the substrate the same.

2. The display panel according to claim 1, characterized in that: The sub-pixel includes a first sub-pixel and a second sub-pixel, and the reflective electrode includes a first reflective electrode corresponding to the first sub-pixel and a second reflective electrode corresponding to the second sub-pixel; the orthographic projection of the first reflective electrode on the base substrate is defined as a first electrode projection, and the orthographic projection of the second reflective electrode on the base substrate is defined as a second electrode projection; The driving circuit includes an interlayer insulating layer, and a first source-drain electrode layer disposed on a side of the interlayer insulating layer away from the base substrate; the first source-drain electrode layer includes a first routing pattern, and an orthographic projection of the first routing pattern on the base substrate is defined as a first routing projection; There is a first overlapping area between the first routing projection and the first electrode projection near the edge; and there is the compensation overlapping area between the compensation projection and at least the second electrode projection.

3. The display panel according to claim 2, characterized in that: The compensation projection has the compensation overlapping region only with the second electrode projection, and the position of the compensation overlapping region relative to the second electrode projection is the same as the position of the first overlapping region relative to the first electrode projection.

4. The display panel according to claim 3, characterized in that: The area of ​​the compensating overlap region is the same as the area of ​​the first overlap region.

5. The display panel according to claim 2, characterized in that: The height compensation pattern is disposed in the same layer as the first source and drain layer.

6. The display panel according to claim 2, characterized in that: The height compensation pattern is separated from the first source and drain layer.

7. The display panel according to claim 2, characterized in that: The driving circuit includes a first gate layer disposed between the first source-drain layer and the base substrate, and the height compensation pattern is disposed between the first gate layer and the first source-drain layer.

8. The display panel according to claim 7, characterized in that: The driving circuit includes a gate insulating layer disposed between the first gate layer and the first source-drain layer, and the height compensation pattern is disposed between the first gate layer and the gate insulating layer.

9. The display panel according to claim 2, characterized in that: The compensation overlap region includes a first compensation overlap region and a second compensation overlap region; the compensation projection and the first electrode projection have the first compensation overlap region, and the compensation projection and the second electrode projection have the second compensation overlap region; The first source-drain electrode layer further includes a second wiring pattern, and the orthographic projection of the second wiring pattern on the base substrate is defined as a second wiring projection; a second overlapping region exists in the middle of the second wiring projection and the second electrode projection; The first compensating overlapping area does not overlap with the first overlapping area, and the second compensating overlapping area does not overlap with the second overlapping area.

10. The display panel according to claim 2, characterized in that: The thickness of at least a portion of the height compensation pattern is positively correlated with the maximum height difference of the surface of the first reflective electrode.

11. The display panel according to claim 10, characterized in that: The thickness of the height compensation pattern in the first compensation overlap region is HG, the thickness of the height compensation pattern in the second compensation overlap region is HR, the maximum height difference of the surface of the first reflective electrode is d, HR=HG+d.

12. The display panel according to claim 2, characterized in that: A first planarization layer and a second planarization layer are stacked on a side of the first source / drain electrode layer away from the base substrate, and the height compensation pattern is arranged between the first planarization layer and the second planarization layer.

13. The display panel according to claim 2, characterized in that: The sub-pixels include a red sub-pixel, a blue sub-pixel, and a green sub-pixel, the first sub-pixel includes the green sub-pixel, and the second sub-pixel includes the blue sub-pixel and the red sub-pixel.

14. A method for preparing a display panel, characterized in that: The method comprises: providing a substrate base plate; forming a plurality of array-distributed drive circuits on one side of the substrate, wherein the drive circuits include a height compensation pattern; forming a reflective electrode on a side of the driving circuit away from the base substrate; The orthographic projection of the height compensation pattern on the base substrate and the orthographic projection of at least part of the reflective electrode on the base substrate have a compensation overlap area, and the height compensation pattern is used to make the inclination angles of all the reflective electrodes relative to the base substrate the same.

15. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 13.

Images