Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel, a preparation method thereof and a display device. The display panel includes: a substrate; the driving layer is located on the substrate; an anode layer and a pixel defining layer on the driving layer; a light emitting layer on the anode layer; the light-emitting layer comprises a plurality of first color light-emitting structures; the cathode layer is located on the light-emitting layer and comprises a plurality of cathode units, and the cathode units comprise first cathode units corresponding to the first color light-emitting structures; the capacitance adjusting layer is located between the substrate and the isolation part; the capacitance adjusting layer comprises a first capacitance adjusting unit corresponding to the first cathode unit; at least part of each first capacitance adjusting unit is located in the projection of the corresponding first cathode unit in the thickness direction of the display panel. The problem that the display effect of the display panel is poor can be solved.

Description

Technical Field

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

[0002] With the development of display technology, the application of display panels is becoming more and more extensive, and correspondingly, the requirements for display panels are becoming higher and higher.

[0003] However, the existing display panels are prone to poor display effects during display, which limits the further application of the display panels. Summary of the invention

[0004] The present invention provides a display panel and a manufacturing method thereof, and a display panel, so as to improve the problem of poor display effect of the display panel.

[0005] According to one aspect of the present invention, there is provided a display panel, the display panel comprising:

[0006] A substrate; a driving layer located on the substrate; an anode layer and a pixel defining layer located on the driving layer;

[0007] The anode layer includes a plurality of anode units arranged at intervals, the pixel defining layer includes a pixel defining portion and an opening defined by the pixel defining portion, and the opening exposes the anode unit;

[0008] A light-emitting layer, located on the anode layer; the light-emitting layer comprises a plurality of first-color light-emitting structures, each of which corresponds to one of the anode units;

[0009] a cathode layer, located on the light-emitting layer, comprising a plurality of cathode units, wherein the cathode units include a first cathode unit corresponding to the first color light-emitting structure;

[0010] A capacitance adjustment layer is located between the substrate and the cathode layer; the capacitance adjustment layer includes a first capacitance adjustment unit corresponding to the first cathode unit; at least a portion of the first capacitance adjustment unit is located within a projection of the corresponding first cathode unit along the thickness direction of the display panel.

[0011] Optionally, at least some of the cathode units are insulated from each other; or, the cathode layer is an integral conductive structure, and the first capacitance adjustment unit is electrically connected to the corresponding anode unit.

[0012] Optionally, the display panel further includes an isolation portion, and the isolation portion is located on the pixel defining portion;

[0013] The plurality of cathode units are arranged at intervals and in contact with the isolation portion;

[0014] The first capacitance adjustment unit further includes another portion located within a projection of the isolation portion in contact with the corresponding first cathode unit;

[0015] Preferably, the isolation portion comprises a conductive material;

[0016] Preferably, the pixel defining layer includes a protruding portion or a recessed portion, and the isolation portion is located on a side of the protruding portion or the recessed portion away from the substrate.

[0017] Optionally, the light-emitting layer further includes a plurality of second color light-emitting structures, and each of the second color light-emitting structures corresponds to one of the anode units;

[0018] The cathode unit further includes a second cathode unit corresponding to the second color light emitting structure;

[0019] The capacitance adjustment layer further includes a second capacitance adjustment unit corresponding to the second cathode unit;

[0020] Along the thickness direction of the display panel, at least a portion of the second capacitance adjustment unit is located within a projection of the corresponding second cathode unit along the thickness direction of the display panel;

[0021] Along the thickness direction of the display panel, an area of ​​the first capacitance adjustment unit located within a projection of the first cathode unit is different from an area of ​​the second capacitance adjustment unit located within a projection of the second cathode unit;

[0022] Preferably, the second capacitance adjustment unit has the same shape as the first capacitance adjustment unit;

[0023] Preferably, the second capacitance adjustment unit has the same area as the first capacitance adjustment unit;

[0024] Preferably, the first cathode unit and the second cathode unit are spaced apart and insulated from each other; or the first cathode unit and the second cathode unit are spaced apart and electrically connected to each other.

[0025] Optionally, the light-emitting layer further includes a plurality of second color light-emitting structures, and each of the second color light-emitting structures corresponds to one of the anode units;

[0026] The cathode unit further includes a second cathode unit corresponding to the second color light emitting structure;

[0027] The capacitance adjustment layer further includes a second capacitance adjustment unit corresponding to the second cathode unit; along the thickness direction of the display panel, a portion of the second capacitance adjustment unit is located within the projection of the isolation portion in contact with the second cathode unit;

[0028] Along the thickness direction of the display panel, an area of ​​the first capacitance adjustment unit located within a projection of the corresponding isolation portion is different from an area of ​​the second capacitance adjustment unit located within a projection of the corresponding isolation portion;

[0029] Preferably, the second capacitance adjustment unit has the same shape as the first capacitance adjustment unit;

[0030] Preferably, the second capacitance adjustment unit has the same area as the first capacitance adjustment unit.

[0031] Optionally, the second capacitance adjustment unit also includes another part located within the projection of the corresponding second cathode unit, and along the thickness direction of the display panel, the area of ​​the first capacitance adjustment unit located within the projection of the corresponding first cathode unit is different from the area of ​​the second capacitance adjustment unit located within the projection of the corresponding second cathode unit.

[0032] Preferably, the isolation portion corresponding to the first capacitance adjusting unit and the isolation portion corresponding to the second capacitance adjusting unit are isolation portions located at different positions.

[0033] Optionally, the light-emitting layer further includes a plurality of second color light-emitting structures, and each of the second color light-emitting structures corresponds to one of the anode units;

[0034] The cathode unit further includes a second cathode unit corresponding to the second color light emitting structure;

[0035] The capacitance adjustment layer further includes a second capacitance adjustment unit corresponding to the second cathode unit;

[0036] Along the thickness direction of the display panel, at least a portion of the second capacitance adjustment unit is located within the projection of the corresponding second cathode unit;

[0037] Along a direction parallel to the substrate, a distance between an end of the first capacitance adjustment unit close to the corresponding opening and the corresponding opening is different from a distance between an end of the second capacitance adjustment unit close to the corresponding opening and the corresponding opening;

[0038] Preferably, the second capacitance adjustment unit has the same shape as the first capacitance adjustment unit;

[0039] Preferably, the second capacitance adjustment unit has the same area as the first capacitance adjustment unit;

[0040] Preferably, the first cathode unit and the second cathode unit are spaced apart and insulated from each other; or the first cathode unit and the second cathode unit are spaced apart and electrically connected to each other;

[0041] Preferably, the display panel also includes an isolation portion, which is located on the pixel defining portion; the multiple cathode units are arranged at intervals and in contact with the isolation portion; the first capacitance adjustment unit also includes another portion located within the projection of the isolation portion in contact with the corresponding first cathode unit; along the thickness direction of the display panel, another portion of the second capacitance adjustment unit is located within the projection of the isolation portion in contact with the second cathode unit.

[0042] Optionally, the light-emitting layer further includes a plurality of second color light-emitting structures, and each of the second color light-emitting structures corresponds to one of the anode units;

[0043] The cathode unit further includes a second cathode unit corresponding to the second color light emitting structure;

[0044] The capacitance adjustment layer further includes a second capacitance adjustment unit corresponding to the second cathode unit;

[0045] Along the thickness direction of the display panel, at least a portion of the second capacitance adjustment unit is located within a projection of the corresponding second cathode unit along the thickness direction of the array substrate;

[0046] Along the thickness direction of the display panel, a distance between the first capacitance adjustment unit and the first cathode unit is different from a distance between the second capacitance adjustment unit and the second cathode unit;

[0047] Preferably, the second capacitance adjustment unit has the same shape as the first capacitance adjustment unit;

[0048] Preferably, the second capacitance adjustment unit has the same area as the first capacitance adjustment unit;

[0049] Preferably, the first cathode unit and the second cathode unit are spaced apart and insulated from each other; or the first cathode unit and the second cathode unit are spaced apart and electrically connected to each other;

[0050] Preferably, the display panel also includes an isolation portion, which is located on the pixel defining portion; the multiple cathode units are arranged at intervals and in contact with the isolation portion; the first capacitance adjustment unit also includes another portion located within the projection of the isolation portion in contact with the corresponding first cathode unit; along the thickness direction of the display panel, another portion of the second capacitance adjustment unit is located within the projection of the isolation portion in contact with the second cathode unit.

[0051] Optionally, the capacitance adjustment layer is provided in the same layer as the anode layer;

[0052] Alternatively, the capacitance adjustment layer is located in the driving layer;

[0053] Preferably, the first capacitance adjustment unit and the corresponding anode unit are an integrated structure.

[0054] Optionally, the display panel further includes an eaves structure, and the eaves structure is disposed on the isolation portion.

[0055] According to another aspect of the present invention, a method for preparing a display panel is provided, the method for preparing a display panel comprising:

[0056] providing a substrate;

[0057] forming a driving layer, an anode layer, a pixel defining layer and a capacitance adjustment layer on the substrate;

[0058] The anode layer includes a plurality of anode units arranged at intervals, the pixel defining layer includes a pixel defining portion and an opening defined by the pixel defining portion, and the opening exposes the anode unit;

[0059] A light-emitting layer and a cathode layer are sequentially formed on the anode unit; wherein the light-emitting layer includes a plurality of first-color light-emitting structures, each of which corresponds to one of the anode units; the cathode layer includes a plurality of cathode units, each of which includes a first cathode unit corresponding to the first-color light-emitting structure; and the capacitance adjustment layer includes a first capacitance adjustment unit corresponding to the first cathode unit;

[0060] At least a portion of the first capacitance adjustment unit is located within a projection of the corresponding first cathode unit along a thickness direction of the display panel.

[0061] According to another aspect of the present invention, a display device is provided, wherein the display panel includes the display panel as described above.

[0062] The technical solution of the embodiment of the present invention adopts a display panel including: a substrate; a driving layer, located on the substrate; an anode layer and a pixel defining layer, located on the driving layer; the anode layer includes a plurality of anode units arranged at intervals, the pixel defining layer includes a pixel defining portion and an opening defined by the pixel defining portion, and the opening exposes the anode unit; a light-emitting layer, located on the anode layer; the light-emitting layer includes a plurality of first color light-emitting structures, each first color light-emitting structure corresponds to an anode unit; a cathode layer, located on the light-emitting layer, including a plurality of cathode units, the cathode units include a first cathode unit corresponding to the first color light-emitting structure; a capacitance adjustment layer, located between the substrate and the cathode layer; the capacitance adjustment layer includes a first capacitance adjustment unit corresponding to the first cathode unit; along the thickness direction of the display panel, at least part of the first capacitance adjustment unit is located within the projection of the corresponding first cathode unit along the thickness direction of the display panel; wherein at least part of the cathode units are insulated from each other; or, the cathode layer is an integral conductive structure, and the first capacitance adjustment unit is electrically connected to the corresponding anode unit. The first capacitor adjustment unit can overlap with the corresponding first cathode unit to form a capacitor structure, which is equivalent to connecting an additional capacitor to the cathode of the first color light-emitting structure, which is equivalent to increasing the capacitance of the first color sub-pixel, thereby reducing the brightness of the first color sub-pixel when it is turned on, thereby avoiding the situation where the display panel is biased towards the first color when it is turned on, that is, it can improve the problem of color deviation when dragging the picture, thereby improving the display effect of the display panel.

[0063] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0065] Figure 1 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention;

[0066] Figure 2 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0067] Figure 3 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0068] Figure 4 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0069] Figure 5 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0070] Figure 6 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0071] Figure 7 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0072] Figure 8 A flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0073] Fig. 9 A schematic diagram of a product formed corresponding to the main steps of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0074] Fig.10 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0075] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0076] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0077] Existing display panels are prone to poor display effects such as color cast. After careful research, the inventors found that the reasons for this technical problem are:

[0078] There are sub-pixels of various colors on the display panel, and the capacitances of sub-pixels of different colors are different, which makes the driving current change process inconsistent, and further leads to inconsistent lighting processes of sub-pixels of different colors, that is, the speeds at which sub-pixels of different colors become brighter are inconsistent, resulting in color deviation problems when dragging the picture.

[0079] In view of the above technical problems, the present invention proposes the following solutions:

[0080] Figure 1 A schematic diagram of a display panel according to an embodiment of the present invention is provided. Figure 1 The display panel includes: a substrate 11; a driving layer 12, the driving layer 12 is located on the substrate 11; an anode layer and a pixel defining layer, the anode layer and the pixel defining layer are located on the driving layer 12; the anode layer includes a plurality of anode units 131 arranged at intervals, the pixel defining layer includes a pixel defining portion 141 and an opening defined by the pixel defining portion, the opening exposing the anode unit 131; a light-emitting layer, located on the anode layer; the light-emitting layer includes a plurality of first color light-emitting structures 151, each first color light-emitting structure 151 corresponds to an anode unit 131; a cathode layer, located on the light-emitting layer, includes a plurality of A cathode unit, the cathode unit includes a first cathode unit 161 corresponding to the first color light-emitting structure 151; a capacitance adjustment layer, located between the substrate 11 and the cathode layer; the capacitance adjustment layer includes a first capacitance adjustment unit 21 corresponding to the first cathode unit 161; at least part of the first capacitance adjustment unit 21 is located within the projection of the corresponding first cathode unit 161 along the thickness direction of the display panel; wherein at least part of the cathode units 161 are insulated from each other; or, the cathode layer is an integral conductive structure, and the first capacitance adjustment unit 21 is electrically connected to the corresponding first anode unit 131.

[0081] Specifically, the substrate 11 may be a rigid substrate, the material of which is, for example, glass; the substrate 11 may also be a flexible substrate, the material of which may be polyimide PI. The driving layer 12 includes a pixel circuit for driving the light-emitting element to display, and the pixel circuit includes a thin film transistor and a capacitor. A thin film transistor generally includes a gate, a source, and a drain. The circuit structure of the pixel circuit may be any one of a 2T1C circuit, a 7T1C circuit, a 7T2C circuit, an 8T1C circuit, or a 9T1C circuit. Herein, a "2T1C circuit" refers to a pixel circuit including two thin film transistors and one capacitor in the pixel circuit, and other "7T1C circuits", "7T2C circuits", "9T1C circuits", and so on. The driving layer 12 may include a stacked active layer 121, a gate layer 122, an interlayer dielectric layer 123, a source-drain electrode layer 124, and a planarization layer 125; of course, the driving layer 12 may also include a metal layer for setting data lines and power signal lines. A buffer layer (not shown) may also be included between the driving layer 12 and the substrate 11.

[0082] The anode layer may be made of a transparent conductive material such as indium tin oxide. The pixel defining layer is formed with a plurality of openings, which expose the corresponding anode units. A sub-pixel is arranged in each opening, and the sub-pixels may be divided into first color sub-pixels, second color sub-pixels, and third color sub-pixels. The structure of the sub-pixel may be an anode unit, a light-emitting structure, and a cathode unit stacked in sequence; the structure of the sub-pixel may also be an anode unit, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting structure, a hole blocking layer, an electron transport layer, an electron injection layer, and a cathode unit stacked in sequence.

[0083] In this embodiment, the light-emitting layer may include light-emitting structures of three colors, namely, a first color light-emitting structure 151 corresponding to a first color sub-pixel, a second color light-emitting structure 152 corresponding to a second color sub-pixel, and a third color light-emitting structure 153 corresponding to a third color sub-pixel; the first color light-emitting structure 151 may be a light-emitting structure emitting red light, the second color light-emitting structure 152 may be a light-emitting structure emitting blue light, and the third color light-emitting structure 153 may be a light-emitting structure emitting green light.

[0084] A plurality of first capacitance adjustment units 21 are provided in the capacitance adjustment layer, and the material of the first capacitance adjustment unit 21 is, for example, metal or other conductive structures. At least part of the first capacitance adjustment unit 21 is located within the projection of the corresponding first cathode unit 161 along the thickness direction of the display panel, which means that in the thickness direction of the display panel, the first capacitance adjustment unit 21 can be completely located within the projection of the corresponding first cathode unit 161, and can also be partially located within the projection of the first cathode unit 161. The first capacitance adjustment unit 21 can overlap with the corresponding first cathode unit 161 to form a capacitance structure. Since the first cathode unit 161 is used as the cathode of the sub-pixel corresponding to the first color light-emitting structure, it is equivalent to connecting an additional capacitor to the cathode of the first color light-emitting structure, that is, it is equivalent to increasing the capacitance of the first color sub-pixel, so that the speed of the first color sub-pixel when it is turned on can be reduced. Since there is an integral relationship between the turning-on speed and the turning-on brightness, when the turning-on speed is small, the brightness when it is turned on is also low, thereby avoiding the situation where the smear is biased towards the first color when the display panel is turned on. At the same time, by setting the first capacitor adjustment unit 21, the brightness of the first color sub-pixel is lower when it is turned on, and the voltage required for turning it on is larger, which can increase the turn-on voltage of the first color sub-pixel. When the driving transistor of the pixel driving circuit is a P-type transistor, the VGMP voltage required to be provided by the driving chip can be reduced, thereby reducing the power consumption of the driving chip; wherein the VGMP voltage is the maximum voltage value corresponding to the sub-pixel display, that is, the voltage value or corresponding voltage required to display 0 grayscale.

[0085] The technical solution of this embodiment adopts a display panel including: a substrate; a driving layer, located on the substrate; an anode layer and a pixel defining layer, located on the driving layer; the anode layer includes a plurality of anode units arranged at intervals, the pixel defining layer includes a pixel defining portion and an opening defined by the pixel defining portion, and the opening exposes the anode unit; a light-emitting layer, located on the anode layer; the light-emitting layer includes a plurality of first color light-emitting structures, each of which corresponds to an anode unit; a cathode layer, located on the light-emitting layer, including a plurality of cathode units, the cathode unit including a first cathode unit corresponding to the first color light-emitting structure; a capacitance adjustment layer, located between the substrate and the cathode layer; the capacitance adjustment layer includes a first capacitance adjustment unit corresponding to the first cathode unit; at least part of the first capacitance adjustment unit is located within the projection of the corresponding first cathode unit along the thickness direction of the display panel. The first capacitance adjustment unit can overlap with the corresponding first cathode unit to form a capacitance structure, which is equivalent to connecting an additional capacitance to the cathode corresponding to the first color light-emitting structure, that is, equivalent to increasing the capacitance of the first color sub-pixel, thereby reducing the brightness of the first color sub-pixel when it is turned on, thereby avoiding the situation where the display panel is biased towards the first color when it is turned on.

[0086] Optionally, at least some of the cathode units 161 are insulated from each other; or, the cathode layer is an integral conductive structure, and the first capacitance adjustment unit 21 is electrically connected to the corresponding first anode unit 131. Figure 1 In the structure shown, the cathode layer can be an integral conductive structure, that is, the cathodes corresponding to each sub-pixel are electrically connected together (the isolating portion 17 can be a conductive material, and the first cathode unit is electrically connected to the other parts of the cathode layer through the isolating portion 17). At this time, if the first capacitance adjustment unit is in a floating state, the capacitance formed by the first capacitance adjustment unit and the cathode layer has the same effect on each sub-pixel. Therefore, in this structure, the first capacitance adjustment unit needs to be electrically connected to the corresponding anode unit, so that the capacitance formed by the first capacitance adjustment unit only affects the corresponding sub-pixel. In some other embodiments, for example, the isolating portion 17 is an insulating material; or Figure 2 As shown, Figure 2 A structural schematic diagram of another display panel provided for an embodiment of the present invention, wherein the isolation portion 17 is a conductive material, but the first cathode unit 161 is only in contact with the portion of the isolation portion 17 adjacent to it, so that each cathode unit in the cathode layer is insulated. At this time, the capacitance formed by the first capacitance adjustment unit 21 and the corresponding first cathode unit 161 will only affect the corresponding sub-pixel but not other sub-pixels. Therefore, in this structure, the first capacitance adjustment unit 21 can be floated or electrically connected to the corresponding anode unit.

[0087] Optionally, continue to refer to Figure 1The display panel includes an isolation portion 17, which is located on the pixel defining portion 141; a plurality of cathode units are arranged at intervals and in contact with the isolation portion 17; the first capacitance adjustment unit 21 also includes another portion located within the projection of the isolation portion 17 in contact with the corresponding first cathode unit 161.

[0088] Specifically, the display panel of the present embodiment is provided with an isolation portion 17, and the material of the isolation portion 17 may be an insulating material. In some other optional embodiments, the isolation portion 17 is a conductive material, for example, aluminum. In a preferred embodiment, an eaves structure 18 is also provided on the isolation portion 17, and the material of the eaves structure may be titanium. The sub-pixels of the present embodiment can be produced by photolithography, without the need for precision mask plates, and thus do not need to use precision mask plates, which can save production costs. Optionally, each isolation portion 17 may be an independent structure; or they may be connected as a whole to form a mesh structure. It should be noted that when the display panel includes an isolation portion, the cathode unit is a portion located between the isolation portions 17. For example, the isolation portions 17 enclose an opening, and the opening enclosed by the isolation portions 17 is arranged corresponding to the opening defined by the pixel defining portion 141, and the cathode unit is a portion arranged corresponding to the opening enclosed by the isolation portions 17.

[0089] The light emitting structure is formed in the opening formed by the pixel defining layer, and the isolating portion 17 can separate the light emitting structure. The cathode unit not only covers the light emitting structure, but also extends along the side wall of the isolating portion 17. When the isolating portion 17 is a conductive material, the first capacitance adjustment unit 21 and the corresponding first cathode unit 161 and the isolating portion 17 can form a capacitor, so that the area where the capacitor can be formed is larger, which is conducive to simplifying the layout design.

[0090] Preferably, in the above embodiment, Figure 3As shown, the portion of the pixel defining layer 141 corresponding to the isolation portion 17 is provided with a protrusion 1411, and the isolation portion 17 is located on the side of the protrusion 1411 away from the substrate 11. In this embodiment, by providing the protrusion 1411, the distance between the isolation portion 17 and the first capacitance adjustment unit 21 is different from the distance between the first cathode unit 161 and the first capacitance adjustment unit 21; that is, when the overlapping area is the same, since the unit area capacitance formed between the first capacitance adjustment unit 21 and the first cathode unit 161 is different from the capacitance value of the unit area capacitance formed between the first cathode unit 21 and the isolation portion 17, the position of the first capacitance adjustment unit 21 can be adjusted to control the size of the total capacitance formed by the first capacitance adjustment unit 21, the first cathode unit 161 and the isolation portion 17, and then adjust the capacitance corresponding to each sub-pixel. Of course, it should be noted that the protrusion 1411 can be the material of the pixel defining layer, or other insulating materials. Of course, the pixel defining layer may also include a recessed portion, and the isolation portion 17 is located on the side of the recessed portion away from the substrate. The dielectric constant of the insulating material at the position corresponding to the recessed portion may be different from that of the pixel defining layer at other positions, or the isolation portion 17 may be directly disposed in the recessed portion. In some other optional implementations, a convex portion or a concave portion may be disposed at the portion of the pixel defining layer corresponding to the first cathode unit.

[0091] Optionally, continue to refer to Figure 1 The light-emitting layer also includes a plurality of second color light-emitting structures 152, each second color light-emitting structure 152 corresponds to an anode unit 131; the cathode unit also includes a second cathode unit 162 corresponding to the second color light-emitting structure 152; the capacitance adjustment layer also includes a second capacitance adjustment unit 22 corresponding to the second cathode unit 162; at least part of the second capacitance adjustment unit 22 is located within the projection of the corresponding second cathode unit 162 along the thickness direction of the display panel.

[0092] Specifically, the material of the second capacitance adjustment unit 22 is, for example, metal or other conductive structures. In the thickness direction of the display panel, the second capacitance adjustment unit 22 can be completely located within the projection of the corresponding second cathode unit 162, and can also be partially located within the projection of the second cathode unit 162. The second capacitance adjustment unit 22 can overlap with the corresponding second cathode unit 162 to form a capacitance structure. And because the overlapping area between the first capacitance adjustment unit 21 and the corresponding first cathode unit 161 is different from the overlapping area between the second capacitance adjustment unit 22 and the corresponding second cathode unit 162, the capacitances of the two capacitors formed are different, so as to avoid the second color sub-pixel and the first color sub-pixel from having the same additional capacitance, resulting in different lighting speeds of the two color sub-pixels when they are turned on, that is, color cast still occurs. At the same time, by setting the second capacitance adjustment unit 22, the turn-on voltage of the second color sub-pixel can also be increased, and then when the driving transistor of the pixel driving circuit is a P-type transistor, the VGMP voltage required to be provided by the driving chip can be reduced, and then the power consumption of the driving chip can be reduced.

[0093] Alternatively, if Figure 1 As shown, the first cathode unit 161 and the second cathode unit 162 are arranged at intervals. In this embodiment, the first capacitance adjustment unit 21 can be floated or electrically connected to the corresponding anode unit.

[0094] In some other embodiments, the first cathode unit 161 and the second cathode unit 162 are spaced apart and electrically connected to each other. In these embodiments, the first cathode unit 161 can be electrically connected to the corresponding anode unit 131 , and the second cathode unit 162 can be electrically connected to the corresponding anode unit 131 .

[0095] In addition, the capacitance adjustment layer has a certain thickness, which may cause the sub-pixels prepared subsequently to be partially convex or partially tilted. In this embodiment, all the first capacitance adjustment units 21 are configured to have the same shape and size, and all the second capacitance adjustment units 22 are configured to have the same shape and size, and the second capacitance adjustment units 22 are configured to have the same shape and at least one of the same size as the first capacitance adjustment units 21, so that the convexity and tilt of the first color sub-pixel caused by the capacitance adjustment layer can be close to the convexity and tilt of the second color sub-pixel, and further, the light emitting direction and angle of the first color sub-pixel and the second color sub-pixel can be close, so that the user will not have obvious color shift when watching from different viewing angles.

[0096] Optionally, in some embodiments, reference may be made to Figure 1The light-emitting layer also includes a plurality of second color light-emitting structures 152, each second color light-emitting structure 152 corresponds to an anode unit 131; the cathode unit also includes a second cathode unit 162 corresponding to the second color light-emitting structure 152; the capacitance adjustment layer also includes a second capacitance adjustment unit 22 corresponding to the second cathode unit 162; along the thickness direction of the display panel, a portion of the second capacitance adjustment unit 22 is located within the projection of the isolation portion 17 in contact with the second cathode unit 162; along the thickness direction of the display panel, the area of ​​the first capacitance adjustment unit 21 located within the projection of the corresponding isolation portion 17 is different from the area of ​​the second capacitance adjustment unit 22 located within the projection of the corresponding isolation portion 17.

[0097] Specifically, the second capacitor adjustment unit 22 can overlap with the corresponding isolation part 17 to form a capacitor structure. And because the overlapping area between the first capacitor adjustment unit 21 and the corresponding isolation part 17 is different from the overlapping area between the second capacitor adjustment unit 22 and the corresponding isolation part 17, the capacitance of the two capacitors formed is different, which avoids the second color sub-pixel and the first color sub-pixel from having the same additional capacitance, resulting in different lighting speeds of the two color sub-pixels when they are turned on, that is, color cast still occurs. It should be noted that when each isolation part 17 is connected to form a mesh structure, the area of ​​the first capacitor adjustment unit located in the projection of the corresponding isolation part is different from the area of ​​the second capacitor adjustment unit located in the projection of the corresponding isolation part; it can be understood that the area of ​​the first capacitor adjustment unit located in the projection of the mesh structure along the thickness direction of the display panel is different from the area of ​​the second capacitor adjustment unit located in the projection of the mesh structure along the thickness direction of the display panel.

[0098] Optionally, the second capacitance adjustment unit has the same shape as the first capacitance adjustment unit.

[0099] Optionally, the second capacitance adjustment unit has the same area as the first capacitance adjustment unit.

[0100] Optionally, in some other embodiments, along the thickness direction of the display panel, the area of ​​the first capacitance adjustment unit 21 located within the projection of the corresponding first cathode unit 161 is different from the area of ​​the second capacitance adjustment unit 22 located within the projection of the corresponding second cathode unit 162; and the area of ​​the first capacitance adjustment unit 21 located within the projection of the corresponding isolation portion 17 is different from the area of ​​the second capacitance adjustment unit 22 located within the projection of the corresponding isolation portion 17.

[0101] Specifically, due to the different thicknesses and materials of the isolation portion and the cathode unit, and the side of the pixel defining portion 141 facing the opening is an inclined surface, that is, the angle between the side of the pixel defining portion 141 facing the opening and the bottom surface of the pixel defining portion 141 facing the substrate 11 is an acute angle, the cathode unit has a slope, and the thickness of the dielectric layer between the cathode unit and the first capacitance adjustment unit is not uniform. Even if the sum of the overlapping area between the isolation portion 17 and the capacitance adjustment unit and the overlapping area formed by the cathode unit and the capacitance adjustment unit are the same, the total capacitance value of the two capacitors formed will be different with the difference in their respective overlapping areas. Therefore, the capacitance value of the two capacitors formed can be adjusted by adjusting the projection area of ​​the capacitance adjustment unit and the corresponding cathode unit and the corresponding isolation portion 17. The two capacitors formed are a parallel structure, and the size of the total capacitance can be adjusted. In this embodiment, along the thickness direction of the display panel, the area of ​​the first capacitance adjustment unit 21 located in the projection of the corresponding first cathode unit 161 is different from the area of ​​the second capacitance adjustment unit 22 located in the projection of the corresponding second cathode unit 162; and the area of ​​the first capacitance adjustment unit 21 located in the projection of the corresponding isolation portion 17 is different from the area of ​​the second capacitance adjustment unit 22 located in the projection of the corresponding isolation portion 17. This arrangement enables the capacitance value of the capacitance formed by the first capacitance adjustment unit 21 to be different from the capacitance value of the capacitance formed by the second capacitance adjustment unit 22. That is, the capacitance connected to the cathode of the first color sub-pixel is different from the capacitance connected to the cathode of the second color sub-pixel. By setting the area of ​​the first capacitor adjustment unit 21 to be located within the projection of the first cathode unit 161, and setting the area of ​​the second capacitor adjustment unit 22 to be located within the projection of the second cathode unit 162, the sum of the capacitance connected to the cathode of the first color sub-pixel and the capacitance of the first color sub-pixel itself is made equal to the sum of the capacitance connected to the cathode of the second color sub-pixel and the capacitance of the second color sub-pixel itself, thereby making the lighting process of the first color sub-pixel and the second color sub-pixel consistent, thereby avoiding color deviation when the display panel is turned on.

[0102] It should be noted that in the above-mentioned embodiment, no capacitance adjustment unit is provided corresponding to the third color sub-pixel, because the phenomenon of biasing toward the third color when the display panel is turned on is weak. Of course, in some other application scenarios, such as when the display quality requirements are high, it can also be provided that the cathode layer also includes a third cathode unit 163 corresponding to the third color light-emitting structure 153; the capacitance adjustment layer also includes a third capacitance adjustment unit corresponding to the third cathode unit 162; along the thickness direction of the display panel, at least part of the third capacitance adjustment unit is located within the projection of the corresponding third cathode unit 163; the third capacitance adjustment unit is the same shape and at least one of the sizes as the first capacitance adjustment unit 21; along the thickness direction of the display panel, the area of ​​the first capacitance adjustment unit 21 located within the projection of the corresponding first cathode unit 161 is The area of ​​the first capacitance adjustment unit 21 located in the projection of the corresponding isolation portion 17 is different from the area of ​​the third capacitance adjustment unit located in the projection of the corresponding isolation portion 17; the area of ​​the second capacitance adjustment unit 22 located in the projection of the corresponding second cathode unit 162 is different from the area of ​​the third capacitance adjustment unit located in the projection of the corresponding third cathode unit 163; the area of ​​the second capacitance adjustment unit 22 located in the projection of the corresponding isolation portion 17 is different from the area of ​​the third capacitance adjustment unit located in the projection of the corresponding isolation portion 17. The function and working principle of the third capacitance adjustment unit are similar to those of the second capacitance adjustment unit, that is, the convexity and inclination of the first color sub-pixel, the convexity and inclination of the second color sub-pixel, and the convexity and inclination of the third color sub-pixel caused by the capacitance adjustment layer can be close, and then the light emitting direction and angle of the first color sub-pixel and the second color sub-pixel can be close, so that the user will not have obvious color shift when watching at different viewing angles. In addition, the sum of the capacitance connected to the cathode of the first color sub-pixel and the capacitance of the first color sub-pixel itself, the sum of the capacitance connected to the cathode of the second color sub-pixel and the capacitance of the second color sub-pixel itself, and the sum of the capacitance connected to the cathode of the third color sub-pixel and the capacitance of the third color sub-pixel can be made equal, thereby making the lighting process of the first color sub-pixel, the second color sub-pixel and the third color sub-pixel consistent, thereby avoiding color shift when the display panel is turned on.

[0103] Optionally, continue to refer to Figure 1 The isolation portion 17 corresponding to the first capacitance adjustment unit 21 and the isolation portion 17 corresponding to the second capacitance adjustment unit 22 are isolation portions located at different positions.

[0104] Specifically, the isolation portion 17 corresponding to the first capacitance adjustment unit 21 is also the isolation portion that forms a capacitance with the first capacitance adjustment unit 21. The isolation portion 17 corresponding to the second capacitance adjustment unit 22 is also the isolation portion that forms a capacitance with the second capacitance adjustment unit 22. The arrangement of this embodiment makes the overall distribution of the first capacitance adjustment unit 21 and the second capacitance adjustment unit 22 in the capacitance adjustment layer more uniform, thereby making the protrusion and inclination of the first color sub-pixel caused by the capacitance adjustment layer closer to the protrusion and inclination of the second color sub-pixel, making the light emitting direction and angle of the first color sub-pixel and the second color sub-pixel closer, and further reducing the color shift phenomenon caused when viewing at different viewing angles.

[0105] Optionally, continue to refer to Figure 1 The capacitance adjustment layer and the anode layer are arranged on the same layer, that is, the capacitance adjustment layer and the anode layer are formed on the same layer.

[0106] Specifically, the capacitance adjustment layer can be made of the same material as the anode layer. For example, when the anode layer is indium tin oxide, the capacitance adjustment layer is also formed of indium tin oxide. The capacitance adjustment layer is provided in the same layer as the anode layer, which does not increase the overall thickness of the display panel.

[0107] Based on the above implementation, it is preferred that the capacitance adjustment layer and the anode layer are formed by the same process. That is, when the anode layer is formed, the capacitance adjustment layer is formed at the same time under the same film preparation process conditions. This arrangement does not increase the process difficulty and process flow when manufacturing the display panel, and is therefore conducive to cost savings.

[0108] In the above embodiment, although the capacitance adjustment layer and the anode layer are in the same layer, the corresponding capacitance adjustment unit and the corresponding anode unit are independent structures. In terms of circuit structure, the other plate of the capacitor connected to the cathode of the sub-pixel is suspended, but because the capacitor is a passive device, it can also store charge when one end of the capacitor is suspended, thereby reducing the brightness of the corresponding sub-pixel when it is turned on.

[0109] In some other embodiments, Figure 4 As shown, Figure 4A schematic diagram of the structure of another display panel provided by an embodiment of the present invention. The first capacitance adjustment unit 21 is an integral structure with the corresponding anode unit. In other words, the first capacitance adjustment unit 21 can be understood as being formed by extending the corresponding anode unit 131. In this way, the other plate of the capacitor connected to the cathode of the sub-pixel is equivalent to being connected to the anode of the sub-pixel. The capacitor has no suspended plate and the working state is more stable. It should be noted that in the integral structure, the definition of the anode unit is the same as that of the traditional anode unit, that is, the part centered on the part exposed by the opening defined by the pixel defining part and extending a preset distance to the part away from the opening can be understood as the anode unit, and the remaining part can be understood as the capacitance adjustment unit; illustratively, in the direction from the center of the anode unit to the edge of the anode unit, the width of the part covered by the pixel defining part in the anode unit is d1, and the spacing between the edges of adjacent openings is d2. When the ratio of d1 to d2 is generally greater than or equal to 0 and less than 0.3. For example, the spacing d2 between the edges of adjacent openings is 14um, and the width d1 of the covered part of the anode unit can be 4.0um. The corresponding isolation portion may be understood as an isolation portion that overlaps with the projection of the integrated structure on the substrate.

[0110] Of course, when the display panel includes the second capacitance adjustment unit 22, the second capacitance adjustment unit 22 may also be configured to be an integrated structure with the corresponding anode unit.

[0111] In some other optional embodiments, such as Figure 5 As shown, Figure 5 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention. The capacitance adjustment layer is arranged in the pixel defining layer. In this embodiment, the capacitance adjustment layer can be arranged in a different layer from the anode layer. Of course, if Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, in which the capacitance adjustment layer is located in the driving layer 12. Specifically, it can be arranged between the planarization layer 125 and the source-drain electrode layer 124, and of course, it can also be arranged in the same layer as the source-drain electrode layer 124, or arranged in other film layers of the driving layer 12.

[0112] Optionally, refer to Figure 2 , along a direction parallel to the substrate 11 , a distance D1 between an end of the first capacitance adjustment unit 21 close to the opening and the corresponding opening is different from a distance D2 between an end of the second capacitance adjustment unit 22 close to the corresponding opening and the corresponding opening.

[0113] Specifically, in this embodiment, the opening corresponding to the capacitance adjustment unit is specifically: an opening of a cathode unit overlapping with the capacitance adjustment unit. Since the side of the pixel defining portion 141 facing the opening is an inclined surface, the inclination angles of the sides of the openings of different pixel defining portions 141 are the same, and the distance D1 and the distance D2 are set to be different, so that the vertical distance between the first capacitance adjustment unit 21 and the corresponding first cathode unit 161 and the vertical distance between the second capacitance adjustment unit 22 and the corresponding second cathode unit 162 are different, thereby making the capacitance values ​​of the formed unit area capacitance different. Due to the different unit area capacitance values, even when the overlapping area of ​​the first capacitance adjustment unit 21 and the first cathode unit 161 is the same as the overlapping area of ​​the second capacitance adjustment unit 22 and the second cathode unit 162, the capacitance values ​​of the two can be different, thereby avoiding the second color sub-pixel and the first color sub-pixel having the same additional capacitance, resulting in different lighting speeds of the two color sub-pixels when lighting up, that is, color cast still occurs.

[0114] Optionally, the distance D1 between one end of the first capacitance adjustment unit 21 close to the opening and the corresponding opening is the minimum distance or the average distance between one end of the first capacitance adjustment unit 21 close to the opening and the opening; the distance D2 between one end of the second capacitance adjustment unit 22 close to the corresponding opening and the corresponding opening is the minimum distance or the average distance between one end of the second capacitance adjustment unit 22 close to the opening and the corresponding opening.

[0115] Optionally, the first cathode unit 161 and the second cathode unit 162 are spaced apart. In this embodiment, the first capacitance adjustment unit 21 can be floated or electrically connected to the corresponding anode unit 131. Alternatively, the first cathode unit 161 and the second cathode unit 162 are spaced apart and electrically connected to each other. In this embodiment, the first capacitance adjustment unit 21 is electrically connected to the corresponding anode unit 131, and the second capacitance adjustment unit 22 is electrically connected to the corresponding anode unit.

[0116] In addition, the shapes and sizes of the first capacitance adjustment units 21 are the same, the shapes and sizes of the second capacitance adjustment units 22 are the same, and the second capacitance adjustment units 22 are the same in shape and at least one of the sizes as the first capacitance adjustment units 21. This can make the protrusion and inclination of the first color sub-pixel caused by the capacitance adjustment layer close to the protrusion and inclination of the second color sub-pixel, and further make the light emitting directions and angles of the first color sub-pixel and the second color sub-pixel close, so that there will be no obvious color cast when the user watches at different viewing angles.

[0117] Optionally, continue to refer to Figure 7The display panel also includes an isolation portion 17, which is located on the pixel defining portion 141; a plurality of cathode units are arranged at intervals and in contact with the isolation portion 17; the first capacitance adjustment unit 21 also includes another portion located within the projection of the isolation portion 17 in contact with the corresponding first cathode unit 161; along the thickness direction of the display panel, another portion of the second capacitance adjustment unit 22 is located within the projection of the isolation portion 17 in contact with the second cathode unit 162.

[0118] Optionally, Figure 7 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Figure 7 The light-emitting layer also includes a plurality of second color light-emitting structures 152, each second color light-emitting structure 152 corresponds to an anode unit 131; the cathode unit also includes a second cathode unit 162 corresponding to the second color light-emitting structure 152; the capacitance adjustment layer also includes a second capacitance adjustment unit 22 corresponding to the second cathode unit 162; along the thickness direction of the display panel, at least part of the second capacitance adjustment unit 22 is located within the projection of the corresponding second cathode unit 162; along the thickness direction of the display panel, the maximum distance between the first capacitance adjustment unit 21 and the first cathode unit 161 is different from the maximum distance between the second capacitance adjustment unit 22 and the second cathode unit 162.

[0119] Specifically, in this embodiment, by setting different distances (the maximum distance between the first capacitance adjustment unit 21 and the first cathode unit 161, and the maximum distance between the second capacitance adjustment unit 22 and the second cathode unit 162), the distances between the plates corresponding to the two capacitors are different, and then the two capacitors are different, so as to avoid the second color sub-pixel and the first color sub-pixel having the same additional capacitance, resulting in different lighting speeds of the two color sub-pixels when they are turned on, that is, color cast still occurs. It should be noted that the capacitance adjustment unit is arranged parallel to the plane where the substrate is located.

[0120] Optionally, the first cathode unit 161 and the second cathode unit 162 are spaced apart. In this embodiment, the first capacitance adjustment unit 21 can be floated or electrically connected to the corresponding anode unit 131. Alternatively, the first cathode unit 161 and the second cathode unit 162 are spaced apart and electrically connected to each other. In this embodiment, the first capacitance adjustment unit 21 is electrically connected to the corresponding anode unit 131, and the second capacitance adjustment unit 22 is electrically connected to the corresponding anode unit.

[0121] In addition, the shapes and sizes of the first capacitance adjustment units 21 are the same, the shapes and sizes of the second capacitance adjustment units 22 are the same, and the second capacitance adjustment units 22 are the same in shape and at least one of the sizes as the first capacitance adjustment units 21. This can make the protrusion and inclination of the first color sub-pixel caused by the capacitance adjustment layer close to the protrusion and inclination of the second color sub-pixel, and further make the light emitting directions and angles of the first color sub-pixel and the second color sub-pixel close, so that there will be no obvious color cast when the user watches at different viewing angles.

[0122] Optionally, continue to refer to Figure 7 The display panel also includes an isolation portion 17, which is located on the pixel defining portion 141; a plurality of cathode units are arranged at intervals and in contact with the isolation portion 17; the first capacitance adjustment unit 21 also includes another portion located within the projection of the isolation portion 17 in contact with the corresponding first cathode unit 161; along the thickness direction of the display panel, another portion of the second capacitance adjustment unit 22 is located within the projection of the isolation portion 17 in contact with the second cathode unit 162.

[0123] The embodiment of the present invention also provides a method for preparing a display panel. Figure 8 A flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention, Fig. 9 A schematic diagram of a product formed corresponding to the main steps of a method for manufacturing a display panel provided in an embodiment of the present invention, combined with Figure 8 and Fig. 9 , a method for preparing a display panel includes:

[0124] Step S101, providing a substrate 11;

[0125] Specifically, the substrate may be, for example, a glass or polyimide substrate.

[0126] Step S102, forming a driving layer 12, an anode layer, a pixel defining layer and a capacitance adjustment layer on a substrate; wherein the anode layer includes a plurality of anode units 131 arranged at intervals, the pixel defining layer includes a pixel defining portion 141 and an opening defined by the pixel defining portion, and the opening exposes the anode unit;

[0127] Specifically, the driving layer 12 may include a stacked active layer 121, a gate layer 122, an interlayer dielectric layer 123, a source-drain electrode layer 124, and a planarization layer 125; of course, the driving layer 12 may also include a metal layer for setting data lines and power signal lines. A buffer layer (not shown) may also be included between the driving layer 12 and the substrate 11. The driving layer 12 may be formed by evaporation, etching, and the like. The anode layer is formed after the driving layer, and the pixel defining layer is formed after the anode layer. The capacitance adjustment layer may be formed when the driving layer is formed, may be formed when the anode layer is formed, that is, formed in the same layer as the anode layer, or may be formed in the process of forming the pixel defining layer.

[0128] Step S103, forming a light-emitting layer and a cathode layer on the anode unit 131 in sequence; wherein the light-emitting layer includes a plurality of first color light-emitting structures 151, each of which corresponds to an anode unit 131; the cathode layer includes a plurality of cathode units, and the cathode units include a first cathode unit 161 corresponding to the first color light-emitting structure; the capacitance adjustment layer includes a first capacitance adjustment unit 21 corresponding to the first cathode unit 161; at least part of the first capacitance adjustment unit 21 is located within the projection of the corresponding first cathode unit 161 along the thickness direction of the display panel. Optionally, at least part of the cathode units are insulated from each other; or, the cathode layer is an integral conductive structure, and the first capacitance adjustment unit is electrically connected to the corresponding first anode unit.

[0129] Specifically, the sub-pixels of this embodiment can be formed by photolithography. For example, the first color sub-pixel 151 is first formed on the entire surface, and then the first color sub-pixel 151 in the corresponding area of ​​the second color sub-pixel 152 and the third color sub-pixel 153 is etched away by photolithography; the second color sub-pixel 152 is then formed on the entire surface, and then the second color sub-pixel 152 in the corresponding area of ​​the first color sub-pixel 151 and the third color sub-pixel 153 is etched away; the third color sub-pixel 153 is then formed on the entire surface, and then the third color sub-pixel 153 in the corresponding area of ​​the first color sub-pixel 151 and the second color sub-pixel 152 is etched away.

[0130] In the display panel prepared by the preparation method provided in this embodiment, the first capacitor adjustment unit 21 can overlap with the corresponding first cathode unit 161 to form a capacitor structure, which is equivalent to connecting an additional capacitor to the cathode of the first color light-emitting structure, that is, equivalent to adding the capacitance of the first color sub-pixel, thereby reducing the brightness of the first color sub-pixel when it is turned on, thereby avoiding the situation where the display panel is biased towards the first color when dragging the picture when the display panel is turned on.

[0131] Optionally, the capacitance adjustment layer and the anode layer are provided in the same layer;

[0132] Forming a driving layer 12, an anode layer, a pixel defining layer and a capacitance adjustment layer on a substrate 11 includes:

[0133] A driving layer 12 is formed on a substrate 11;

[0134] An anode layer and a capacitance adjustment layer are formed on the driving layer 12 by using the same film preparation process;

[0135] A pixel defining layer is formed.

[0136] Specifically, after forming the driving layer 12, the capacitance adjustment layer and the anode layer can be formed simultaneously by the same film preparation process. The capacitance adjustment layer can be the same material as the anode layer. For example, when the anode layer is indium tin oxide, the capacitance adjustment layer is also formed using indium tin oxide. The capacitance adjustment layer and the anode layer are arranged in the same layer, which will not increase the overall thickness of the display panel. In addition, the capacitance adjustment layer includes a plurality of capacitance adjustment units, and each capacitance adjustment unit and the corresponding anode unit can also be an integrated structure.

[0137] The embodiment of the present invention further provides a display device, such as Fig.10 As shown, Fig.10 This is a schematic diagram of the structure of a display device provided by an embodiment of the present invention. The display device may be a mobile phone, a tablet computer, an MP3, an MP4, a smart watch, a smart bracelet, a personal digital assistant, a smart helmet or other wearable devices. Since it includes the display panel provided by any embodiment of the present invention, it also has the same beneficial effects, which will not be described in detail here.

[0138] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0139] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: The display panel comprises: substrate; A driving layer, located on the substrate; An anode layer and a pixel defining layer, located on the driving layer; The anode layer includes a plurality of anode units arranged at intervals, the pixel defining layer includes a pixel defining portion and an opening defined by the pixel defining portion, and the opening exposes the anode unit; A light-emitting layer, located on the anode layer; the light-emitting layer comprises a plurality of first-color light-emitting structures, each of which corresponds to one of the anode units; a cathode layer, located on the light-emitting layer, comprising a plurality of cathode units, wherein the cathode units include a first cathode unit corresponding to the first color light-emitting structure; A capacitance adjustment layer is located between the substrate and the cathode layer; the capacitance adjustment layer includes a first capacitance adjustment unit corresponding to the first cathode unit; at least a portion of the first capacitance adjustment unit is located within a projection of the corresponding first cathode unit along the thickness direction of the display panel.

2. The display panel according to claim 1, characterized in that: At least some of the cathode units are insulated from each other; or, the cathode layer is an integral conductive structure, and the first capacitance adjustment unit is electrically connected to the corresponding anode unit; Preferably, the display panel further comprises an isolating portion, the isolating portion being located on the pixel defining portion; the plurality of cathode units are arranged at intervals and in contact with the isolating portion; the first capacitance adjusting unit further comprises another portion located within a projection of the isolating portion in contact with the corresponding first cathode unit; Preferably, the isolation portion comprises a conductive material; Preferably, the pixel defining layer includes a protrusion or a depression, and the isolation portion is located on a side of the protrusion or the depression away from the substrate; Preferably, the display panel further comprises an eaves structure, and the eaves structure is arranged on the isolation portion; along the thickness direction of the display panel, the isolation portion is located within the projection of the eaves structure.

3. The display panel according to claim 1, characterized in that: The light-emitting layer further includes a plurality of second color light-emitting structures, each of which corresponds to one of the anode units; The cathode unit further includes a second cathode unit corresponding to the second color light emitting structure; The capacitance adjustment unit further includes a second capacitance adjustment unit corresponding to the second cathode unit; Along the thickness direction of the display panel, at least a portion of the second capacitance adjustment unit is located within the projection of the corresponding second cathode unit; Along the thickness direction of the display panel, an area of ​​the first capacitance adjustment unit located within a projection of the first cathode unit is different from an area of ​​the second capacitance adjustment unit located within a projection of the second cathode unit; Preferably, the second capacitance adjustment unit has the same shape as the first capacitance adjustment unit; Preferably, the second capacitance adjustment unit has the same area as the first capacitance adjustment unit; Preferably, the first cathode unit and the second cathode unit are spaced apart and insulated from each other; or the first cathode unit and the second cathode unit are spaced apart and electrically connected to each other.

4. The display panel according to claim 2, characterized in that: The light-emitting layer further includes a plurality of second color light-emitting structures, each of which corresponds to one of the anode units; The cathode unit further includes a second cathode unit corresponding to the second color light emitting structure; The capacitance adjustment layer further includes a second capacitance adjustment unit corresponding to the second cathode unit; along the thickness direction of the display panel, a portion of the second capacitance adjustment unit is located within the projection of the isolation portion in contact with the second cathode unit; Along the thickness direction of the display panel, an area of ​​the first capacitance adjustment unit located within a projection of the corresponding isolation portion is different from an area of ​​the second capacitance adjustment unit located within a projection of the corresponding isolation portion; Preferably, the second capacitance adjustment unit has the same shape as the first capacitance adjustment unit; Preferably, the second capacitance adjustment unit has the same area as the first capacitance adjustment unit.

5. The display panel according to claim 4, wherein the second capacitance adjustment unit further comprises another portion located within the projection of the corresponding second cathode unit, and along the thickness direction of the display panel, the area of ​​the first capacitance adjustment unit located within the projection of the corresponding first cathode unit is different from the area of ​​the second capacitance adjustment unit located within the projection of the corresponding second cathode unit; Preferably, the isolation portion corresponding to the first capacitance adjusting unit and the isolation portion corresponding to the second capacitance adjusting unit are isolation portions located at different positions.

6. The display panel according to claim 1, characterized in that: The light-emitting layer further includes a plurality of second color light-emitting structures, each of which corresponds to one of the anode units; The cathode unit further includes a second cathode unit corresponding to the second color light emitting structure; The capacitance adjustment layer further includes a second capacitance adjustment unit corresponding to the second cathode unit; Along the thickness direction of the display panel, at least a portion of the second capacitance adjustment unit is located within the projection of the corresponding second cathode unit; Along a direction parallel to the substrate, a distance between an end of the first capacitance adjustment unit close to the corresponding opening and the corresponding opening is different from a distance between an end of the second capacitance adjustment unit close to the corresponding opening and the corresponding opening; Preferably, the second capacitance adjustment unit has the same shape as the first capacitance adjustment unit; Preferably, the second capacitance adjustment unit has the same area as the first capacitance adjustment unit; Preferably, the first cathode unit and the second cathode unit are spaced apart and insulated from each other; or the first cathode unit and the second cathode unit are spaced apart and electrically connected to each other; Preferably, the display panel also includes an isolation portion, which is located on the pixel defining portion; the multiple cathode units are arranged at intervals and in contact with the isolation portion; the first capacitance adjustment unit also includes another portion located within the projection of the isolation portion in contact with the corresponding first cathode unit; along the thickness direction of the display panel, another portion of the second capacitance adjustment unit is located within the projection of the isolation portion in contact with the second cathode unit.

7. The display panel according to claim 1, characterized in that: The light-emitting layer further includes a plurality of second color light-emitting structures, each of which corresponds to one of the anode units; The cathode unit further includes a second cathode unit corresponding to the second color light emitting structure; The capacitance adjustment layer further includes a second capacitance adjustment unit corresponding to the second cathode unit; Along the thickness direction of the display panel, at least a portion of the second capacitance adjustment unit is located within the projection of the corresponding second cathode unit; Along the thickness direction of the display panel, a maximum distance between the first capacitance adjustment unit and the first cathode unit is different from a maximum distance between the second capacitance adjustment unit and the second cathode unit; Preferably, the second capacitance adjustment unit has the same shape as the first capacitance adjustment unit; Preferably, the second capacitance adjustment unit has the same area as the first capacitance adjustment unit; Preferably, the first cathode unit and the second cathode unit are spaced apart and insulated from each other; or the first cathode unit and the second cathode unit are spaced apart and electrically connected to each other; Preferably, the display panel also includes an isolation portion, which is located on the pixel defining portion; the multiple cathode units are arranged at intervals and in contact with the isolation portion; the first capacitance adjustment unit also includes another portion located within the projection of the isolation portion in contact with the corresponding first cathode unit; along the thickness direction of the display panel, another portion of the second capacitance adjustment unit is located within the projection of the isolation portion in contact with the second cathode unit.

8. The display panel according to claim 1, characterized in that: The capacitance adjustment layer is arranged on the same layer as the anode layer; Alternatively, the capacitance adjustment layer is located in the driving layer; Preferably, the first capacitance adjustment unit and the corresponding anode unit are an integrated structure.

9. A method for preparing a display panel, characterized in that: The method for preparing the display panel includes: providing a substrate; forming a driving layer, an anode layer, a pixel defining layer and a capacitance adjustment layer on the substrate; The anode layer includes a plurality of anode units arranged at intervals, the pixel defining layer includes a pixel defining portion and an opening defined by the pixel defining portion, and the opening exposes the anode unit; A light-emitting layer and a cathode layer are sequentially formed on the anode unit; wherein the light-emitting layer includes a plurality of first-color light-emitting structures, each of which corresponds to one of the anode units; the cathode layer includes a plurality of cathode units, each of which includes a first cathode unit corresponding to the first-color light-emitting structure; and the capacitance adjustment layer includes a first capacitance adjustment unit corresponding to the first cathode unit; At least a portion of the first capacitance adjustment unit is located within a projection of the corresponding first cathode unit along a thickness direction of the display panel.

10. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 8.

Images