Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel, a preparation method thereof and a display device, and belongs to the technical field of display. The display panel includes: a substrate; the pixel definition layer is arranged on one side of the substrate; the pixel definition layer defines a plurality of pixel openings surrounded by the pixel definition layer; the cathode wiring layer partially covers one side, far away from the substrate, of the pixel definition layer; the cathode wiring layer comprises a plurality of cathode wires extending in the column direction of the display panel, and at least part of the cathode wires are insulated from one another; the plurality of sub-pixels are respectively arranged corresponding to the pixel openings; the sub-pixel comprises a cathode; the cathodes of the sub-pixels in the row direction of the display panel are in lap joint with the different cathode wires respectively. According to the embodiment of the invention, the cathode voltage can be independently supplied to different sub-pixels.

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, people have higher and higher requirements for the display quality of display panels. At present, the cathodes of each sub-pixel in the display panel are connected to each other through cathode wiring, and the cathode signal is transmitted to the cathode of each sub-pixel through the cathode wiring, which cannot meet the different requirements of different sub-pixels for cathode voltage. Summary of the invention

[0003] The present invention provides a display panel and a manufacturing method thereof, and a display device, so as to supply cathode voltages to different sub-pixels separately.

[0004] In a first aspect, an embodiment of the present invention provides a display panel, including:

[0005] substrate;

[0006] A pixel definition layer is disposed on one side of the substrate; the pixel definition layer defines a plurality of pixel openings surrounded by the pixel definition layer;

[0007] a cathode wiring layer, partially covering a side of the pixel definition layer away from the substrate; the cathode wiring layer comprises a plurality of cathode wirings extending along a column direction of the display panel, at least some of the cathode wirings being insulated from each other;

[0008] A plurality of sub-pixels are respectively arranged corresponding to the pixel openings; the sub-pixels include cathodes; and the cathodes of the sub-pixels in the row direction of the display panel are respectively overlapped with different cathode wirings.

[0009] Optionally, the sub-pixel further includes a light-emitting layer, which is disposed on a side of the cathode of the sub-pixel close to the substrate; the light-emitting layer and the cathode of the sub-pixel both extend from the bottom of the pixel opening to the top of the pixel definition layer;

[0010] The portion of the sub-pixel located above the pixel definition layer includes an overlap area and a non-overlap area; in the overlap area, the cathode of the sub-pixel covers the light-emitting layer of the sub-pixel and partially covers the cathode wiring; in the non-overlap area, the cathode of the sub-pixel does not overlap with the cathode wiring;

[0011] Preferably, one cathode wiring is arranged between two adjacent columns of sub-pixels, and along the row direction, the distances between two sides of the cathode wiring and respective adjacent pixel openings are equal.

[0012] Optionally, for a cathode wiring having overlap with the cathode of the sub-pixel on only one side along the row direction, a distance between the overlapped side of the cathode wiring and an adjacent pixel opening is smaller than a distance between a non-overlapped side of the cathode wiring and an adjacent pixel opening;

[0013] Preferably, the sub-pixel further comprises a light-emitting layer, which is arranged on a side of the cathode of the sub-pixel close to the substrate; the light-emitting layer and the cathode of the sub-pixel both extend from the bottom of the pixel opening to the top of the pixel definition layer;

[0014] The portion of the sub-pixel located above the pixel definition layer includes an overlapping area and a non-overlapping area; in the overlapping area, the cathode of the sub-pixel covers the light-emitting layer of the sub-pixel and partially covers the cathode wiring; in the non-overlapping area, the cathode of the sub-pixel does not overlap with the cathode wiring, the cathode of the sub-pixel covers the light-emitting layer of the sub-pixel, and overlaps to the top of the pixel definition layer.

[0015] Optionally, the display panel further comprises: a pixel encapsulation layer, which is arranged on a side of the cathode of the sub-pixel away from the substrate; the pixel encapsulation layer comprises: a plurality of pixel encapsulation structures, which respectively correspond to and cover the cathode of each sub-pixel;

[0016] Wherein, corresponding to the overlapping area, the pixel encapsulation structure overlaps with the top of the cathode wiring; corresponding to the non-overlapping area, the pixel encapsulation structure overlaps with the top of the pixel definition layer;

[0017] Preferably, along the row direction, one side of the sub-pixel is located in the overlapping area, and the other side is located in the non-overlapping area; along the column direction, both sides of the sub-pixel are located in the non-overlapping area.

[0018] Optionally, the cathode of each sub-pixel is only overlapped with the cathode wiring arranged on one side of the sub-pixel along the row direction; wherein the cathodes of sub-pixels of different colors are respectively overlapped with different cathode wirings, and the cathode wirings overlapped with the cathodes of sub-pixels of different colors are insulated from each other;

[0019] Preferably, the cathodes of the sub-pixels of the same color in each column of the sub-pixels are connected to the same cathode wiring;

[0020] Preferably, the colors of the sub-pixels in the same column are the same;

[0021] Preferably, along the row direction, a cathode wiring is arranged on the first side of each column of the sub-pixels, and the cathodes of the sub-pixels in each column are overlapped with the cathode wiring arranged on the first side of the sub-pixels in the column;

[0022] Preferably, the plurality of sub-pixels include: a plurality of first color sub-pixels, a plurality of second color sub-pixels and a plurality of third color sub-pixels; along the row direction of the display panel, the first color sub-pixels, the second color sub-pixels and the third color sub-pixels are alternately arranged;

[0023] Preferably, the light emitting color of the first color sub-pixel is red, the light emitting color of the second color sub-pixel is green, and the light emitting color of the third color sub-pixel is blue;

[0024] Preferably, the cathode wirings overlapped by the sub-pixels of the same color are electrically connected.

[0025] Optionally, along the row direction, the width of each cathode wiring is ≥2 μm;

[0026] Preferably, along the row direction, the width of each cathode wiring is ≥3 μm;

[0027] Preferably, the row direction is a scanning direction of the display panel, and the sub-pixels in the same row are scanned simultaneously.

[0028] In a second aspect, an embodiment of the present invention further provides a display panel, including:

[0029] substrate;

[0030] A pixel definition layer is disposed on one side of the substrate; the pixel definition layer defines a plurality of pixel openings arranged in an array and surrounded by the pixel definition layer;

[0031] A plurality of sub-pixels are respectively arranged corresponding to the pixel openings; the sub-pixels include cathodes;

[0032] A cathode wiring layer is arranged on a side of the pixel definition layer away from the substrate; the cathode wiring layer includes a plurality of cathode wirings extending along the column direction of the display panel and arranged along the row direction of the display panel; wherein, along the row direction, only one side of each cathode wiring is overlapped with the cathode of the sub-pixel; the sub-pixels overlapped by one cathode wiring have the same color, and different cathode wirings overlapped to sub-pixels of different colors are insulated from each other.

[0033] Optionally, a distance between an overlapping side of the cathode wiring and an adjacent pixel opening is less than or equal to a distance between a non-overlapping side of the cathode wiring and an adjacent pixel opening.

[0034] Optionally, the display panel further comprises: a pixel encapsulation layer, which is arranged on a side of the cathode of the sub-pixel away from the substrate; the pixel encapsulation layer covers the cathode of each sub-pixel;

[0035] Wherein, on the overlapping side of the cathode wiring, the pixel encapsulation layer overlaps with the top of the cathode wiring;

[0036] A cathode wiring is arranged between two adjacent columns of sub-pixels, and on the non-overlapping side of the cathode wiring, the pixel encapsulation layer overlaps with the top of the pixel definition layer, or overlaps with the top of the pixel definition layer and the top of the cathode wiring.

[0037] In a third aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, comprising:

[0038] Providing a substrate; the substrate includes a pixel circuit in each sub-pixel;

[0039] An anode layer is prepared on one side of the substrate; the anode layer includes an anode of each of the sub-pixels;

[0040] A pixel definition layer is prepared on one side of the substrate; the pixel definition layer and the anode layer are arranged on the same side of the substrate; the pixel definition layer defines a plurality of pixel openings surrounded by the pixel definition layer, and each of the sub-pixels is arranged corresponding to each of the pixel openings;

[0041] A cathode wiring layer is prepared on a side of the pixel definition layer away from the substrate; the cathode wiring layer partially covers the side of the pixel definition layer away from the substrate; the cathode wiring layer includes a plurality of cathode wirings extending along a column direction of the display panel, and at least some of the cathode wirings are insulated from each other;

[0042] An isolation structure layer is prepared on a side of the cathode wiring layer away from the pixel definition layer; the isolation structure layer includes isolation columns surrounding each pixel opening;

[0043] Based on the isolation function of the isolation column, the light-emitting layer and cathode of each sub-pixel are respectively evaporated in each pixel opening to form each sub-pixel; wherein the cathode of each sub-pixel in the row direction of the display panel is respectively overlapped with different cathode wirings.

[0044] Optionally, evaporating the light-emitting layer and the cathode of each sub-pixel in each pixel opening respectively comprises:

[0045] The light emitting layer and the cathode of each sub-pixel are respectively evaporated in each pixel opening, comprising:

[0046] For any of the sub-pixels:

[0047] Corresponding to the overlapping area of ​​the sub-pixel, the evaporation angle of the cathode is set to be greater than the evaporation angle of the light-emitting layer; corresponding to the non-overlapping area of ​​the sub-pixel, the evaporation angle of the cathode is set to be less than the evaporation angle of the light-emitting layer;

[0048] The light-emitting layer and the cathode are evaporated in sequence according to the set evaporation angle, so that in the overlapping area, the cathode of the sub-pixel covers the light-emitting layer of the sub-pixel and partially covers the cathode wiring; in the non-overlapping area, the cathode of the sub-pixel partially covers the light-emitting layer of the sub-pixel, and the cathode of the sub-pixel does not overlap with the cathode wiring.

[0049] Optionally, a cathode wiring layer is prepared on a side of the pixel definition layer away from the substrate, comprising:

[0050] Depositing a cathode wiring material on a side of the pixel definition layer away from the substrate to form a cathode wiring material layer;

[0051] The cathode wiring material layer is patterned to form the cathode wiring layer; wherein, for the cathode wiring that overlaps with the cathode of the sub-pixel on only one side along the row direction, the distance between the overlapping side of the cathode wiring and the adjacent pixel opening is set to be smaller than the distance between the non-overlapping side of the cathode wiring and the adjacent pixel opening.

[0052] Optionally, forming each of the sub-pixels includes: sequentially forming sub-pixels of different colors;

[0053] The formation process of any target color sub-pixel includes:

[0054] Vapor-depositing the light-emitting material of the target color sub-pixel on a side of the anode layer away from the substrate to form a target color light-emitting material layer;

[0055] Vapor depositing a cathode material of a sub-pixel on a side of the target color light-emitting material layer away from the anode layer to form a cathode material layer;

[0056] Depositing a first inorganic material on a side of the cathode material layer away from the target color light emitting material layer to form a first inorganic material layer;

[0057] forming a photoresist on a side of the first inorganic material layer away from the cathode material layer, corresponding to a position of a pixel opening where the target color sub-pixel is located;

[0058] Removing the first inorganic material, cathode material and light-emitting material except for the portion covered by the photoresist;

[0059] The photoresist is removed.

[0060] Optionally, after forming each of the sub-pixels, the method further includes:

[0061] Prepare a pixel encapsulation layer on a side of each sub-pixel away from the substrate;

[0062] removing the isolation structure layer;

[0063] Preparing an organic encapsulation layer on a side of the pixel encapsulation layer away from the substrate;

[0064] An inorganic encapsulation layer is prepared on a side of the organic encapsulation layer away from the pixel encapsulation layer.

[0065] In a fourth aspect, an embodiment of the present invention further provides a display device, comprising: a display panel provided by any embodiment of the present invention.

[0066] In the display panel provided by the embodiment of the present invention, a cathode wiring layer is provided to partially cover the side of the pixel definition layer away from the substrate, and the cathode wiring layer includes a plurality of cathode wirings extending along the column direction. The cathode of the sub-pixel can directly overlap with the cathode wiring to obtain the cathode voltage transmitted on the cathode wiring, and there is no need to set a cross-wire located in other film layers, so that the display panel structure is simple; at the same time, by setting the cathodes of different sub-pixels in the same row to overlap with different cathode wirings respectively, and setting insulation between at least some of the cathode wirings, the cathode voltages of different sub-pixels can be independently controlled, so that the cathode voltages of different sub-pixels can be provided separately without affecting each other, so as to meet the driving requirements of different sub-pixels.

[0067] 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

[0068] 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.

[0069] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0070] Figure 2 It is a kind of Figure 1 Schematic diagram of the cross-sectional structure along line A-A';

[0071] Figure 3 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0072] Figure 4 It is a kind of Figure 1 Schematic diagram of the cross-sectional structure of C-C';

[0073] Figure 5is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0074] Figure 6 It is a kind of Figure 5 Schematic diagram of the cross-sectional structure along D-D';

[0075] Figure 7 is a schematic flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0076] Figure 8 is a schematic structural diagram of a display panel in S110-S160 provided by an embodiment of the present invention;

[0077] Figure 9-10 is a schematic structural diagram of a display panel provided by an embodiment of the present invention in various steps of preparing a red sub-pixel;

[0078] Fig.11 It is a schematic diagram of the structure of a display panel in S170-S190 provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0079] 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.

[0080] 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 numbers 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.

[0081] An embodiment of the present invention provides a display panel. Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention, Figure 2 This is a method provided by an embodiment of the present invention. Figure 1 Schematic diagram of the cross-sectional structure of A-A'. Figure 1 and Figure 2The display panel includes: a substrate 10, a pixel definition layer 20, a cathode wiring layer 30 and a plurality of sub-pixels 40. The row direction X, the column direction Y and the thickness direction Z of the display panel constitute a three-dimensional rectangular coordinate system, and the positional relationship between the film layer structures is described below based on the coordinate system.

[0082] The pixel definition layer 20 is disposed on one side of the substrate 10, for example, above the substrate 10. The pixel definition layer 20 defines a plurality of pixel openings 21 surrounded by the pixel definition layer 20. The cathode wiring layer 30 is disposed on the side of the pixel definition layer 20 away from the substrate 10, for example, above the pixel definition layer 20. The cathode wiring layer 30 partially covers the side of the pixel definition layer 20 away from the substrate 10. The cathode wiring layer 30 includes a plurality of cathode wirings 31 extending along the column direction Y of the display panel, and at least some of the cathode wirings 31 are insulated from each other. A plurality of sub-pixels 40 are respectively disposed corresponding to each pixel opening 21. The sub-pixel 40 includes a cathode 43. The cathode 43 is overlapped with the cathode wiring 31 to obtain a cathode voltage; each cathode wiring 31 is overlapped with the cathode 43 of at least one sub-pixel 40. The cathodes 43 of the sub-pixels 40 in the row direction X are respectively connected to different cathode wirings 31. In other words, the cathodes 43 of different sub-pixels 40 in the same row are respectively connected to different cathode wirings 31, so that the cathode voltages of different sub-pixels can be provided by different cathode wirings 31. In practical applications, the cathode wirings 31 can be insulated from each other, or some of the cathode wirings 31 can be electrically connected and some of the cathode wirings 31 can be insulated from each other according to requirements.

[0083] In the display panel provided by the embodiment of the present invention, a cathode wiring layer 30 is provided to partially cover the side of the pixel definition layer 20 away from the substrate, and the cathode wiring layer 30 includes a plurality of cathode wirings 31 extending along the column direction Y. Among them, the cathode 43 of the sub-pixel 40 can directly overlap with the cathode wiring 31 to obtain the cathode voltage transmitted on the cathode wiring 31, and there is no need to set a cross-wire located in other film layers, so that the display panel structure is simple; at the same time, by setting the cathodes 43 of different sub-pixels 40 in the same row to overlap with different cathode wirings 31 respectively, and setting at least part of the cathode wirings 31 to be insulated, the cathode voltages of different sub-pixels 40 can be independently controlled, so that the cathode voltages of different sub-pixels 40 can be provided separately without affecting each other, so as to meet the driving requirements of different sub-pixels 40.

[0084] On the basis of the above-mentioned embodiments, optionally, in the process of display driving of the display panel, each sub-pixel 40 is scanned row by row, and the row direction X is the scanning method of the display panel. The scanning circuit in the display panel connects each row of sub-pixels 40, for example, through each scanning line extending along the row direction X. Under the control of the scanning circuit in the display panel, each row of sub-pixels 40 performs initialization and data writing and other actions row by row to complete the scanning. The scanning process of the sub-pixels 40 in the same row is carried out simultaneously. Since the cathodes 43 of different sub-pixels 40 in the same row are respectively overlapped with different cathode wirings 31, the sub-pixels 40 in the same row can receive the corresponding cathode voltages independently from different cathode wirings 31 when scanning to meet the driving requirements of different sub-pixels 40 in the same row.

[0085] Based on the above embodiments, optionally, the cathode 43 of each sub-pixel 40 can be set to overlap only with the cathode wiring 31 set on one side of the sub-pixel 40 along the row direction X of the display panel, so as to realize a structure in which the cathode 43 of each sub-pixel 40 in the row direction X is overlapped with different cathode wiring 31 respectively.

[0086] The display panel may include sub-pixels 40 of multiple colors, and different requirements of different sub-pixels 40 for cathode voltages may be, for example, different cathode voltages required by sub-pixels 40 of different colors, so as to improve the display effect. Accordingly, cathodes 43 of sub-pixels 40 of different colors may be respectively connected to different cathode wirings 31, and the cathode wirings 31 connected to the cathodes 43 of sub-pixels 40 of different colors are insulated from each other.

[0087] Exemplarily, each sub-pixel 40 may be arranged in an array in the display panel. The sub-pixel 40 may include a pixel circuit and a light-emitting device. The pixel circuit is, for example, arranged in the array layer of the substrate 10; the light-emitting device may include an anode 41, a light-emitting layer 42, and a cathode 43 stacked in a direction away from the substrate 10. The anode 41 of the light-emitting device is connected to the pixel circuit through a via, and the cathode 43 is electrically connected to the cathode wiring 31 by overlapping with the cathode wiring 31. Exemplarily, the pixel circuit provides an anode voltage and a driving current to the anode 41, and the cathode wiring 31 provides a cathode voltage to the cathode 43; in the light-emitting device, the anode 41 injects holes into the light-emitting layer 42, and the cathode 43 injects electrons into the light-emitting layer 42. The formed electrons and holes form excitons in the light-emitting layer 42, and the excitons return to the ground state through radiation transition, so that the light-emitting device emits light, that is, the sub-pixel 40 emits light. Among them, each sub-pixel 40 may include sub-pixels 40 of multiple colors, and the light-emitting layer 42 of sub-pixels 40 of different colors has different materials. The brightness of the sub-pixel 40 is related to the voltage applied to the sub-pixel 40; when the luminous brightness is the same, the cathode voltage required for the sub-pixels 40 of different colors is not the same. By setting the insulation between the cathode wirings 31 overlapped by the cathodes 43 of the sub-pixels 40 of different colors, the cathode voltages of the sub-pixels 40 of different colors can be provided separately to meet the display driving requirements of the sub-pixels 40 of each color. Exemplarily, the sub-pixels 40 in the display panel may include at least red sub-pixels (represented by R), green sub-pixels (represented by G) and blue sub-pixels (represented by B) to achieve color display; wherein the light-emitting layer of the red sub-pixel can be recorded as 42R, the light-emitting layer of the green sub-pixel can be recorded as 42G, and the light-emitting layer of the blue sub-pixel can be recorded as 43G; the anode 41 materials of the sub-pixels 40 of different colors can be the same, and the cathode 43 materials of the sub-pixels 40 of different colors can also be the same.

[0088] The cathode wiring layer 30 may be made of a conductive material, such as a metal, an alloy or a metal oxide. The cathode wiring layer 30 may include a plurality of cathode wirings 31 extending along the column direction Y and arranged along the row direction X. Exemplarily, the bottom of the anode 41 of the sub-pixel 40 may be flush with the bottom of the pixel definition layer 20, and the light-emitting layer 42 and the cathode 43 of the sub-pixel 40 extend from the bottom of the pixel opening 21 to the top of the pixel definition layer 20; each cathode wiring 31 is arranged on the top of the pixel definition layer 20. The cathode 43 of the sub-pixel 40 can be electrically connected to the cathode wiring 31 directly by overlapping with the cathode wiring 31, without the need for a cross-line connection set on other conductive film layers. It can be understood that the top of the pixel definition layer 40 is the side of the pixel definition layer 40 away from the substrate 10, and the bottom of the pixel definition layer 40 is the side of the pixel definition layer 40 close to the substrate 10.

[0089] The cathode 43 of each sub-pixel 40 overlaps with the cathode wiring 31 arranged on one side of the sub-pixel 40 along the row direction X, and then, along the row direction X, the cathode wiring 31 arranged on the other side of the sub-pixel 40 can overlap with other sub-pixels 40. Figure 2 As shown, from left to right, the cathode 43 of the first sub-pixel 40 overlaps with the cathode wiring 31 on its left side, but not with the cathode wiring 31 on its right side; then, the cathode wiring 31 on the right side of the first sub-pixel 40 can be used to overlap with the cathode 43 of the second sub-pixel 40; and so on, each sub-pixel 40 in the same row can be overlapped with different cathode wirings 31 and receive the required cathode voltage independently. Therefore, by setting each sub-pixel 40 to overlap with the cathode wiring 31 on one side, it is possible to leave space on the other side of the sub-pixel 40 for arranging the cathode wiring 31 that overlaps with other sub-pixels 40, and realize the electrical connection between each sub-pixel 40 and the corresponding cathode wiring 31 without adding crossover wires in other conductive film layers, thereby simplifying the steps of preparing the display panel. Furthermore, if the cathode of each sub-pixel 40 is overlapped with the conductive structure arranged on both sides of the sub-pixel 40 along the row direction X, if it is desired to provide the cathode voltages of the sub-pixels 40 on both sides of the conductive structure separately, it is also necessary to provide a Mask process to cut the conductive structure, so as to divide a conductive structure between two columns of sub-pixels 40 into two insulated conductive structures, and provide cathode voltages to the cathodes 43 on both sides respectively; compared with the above scheme, the embodiment of the present invention provides a scheme for overlapping the cathode 43 of the sub-pixel 40 with the single-sided cathode wiring 31, and there is no need to cut the cathode wiring 31 after the overlap is completed. The cathode voltages of sub-pixels 40 of different colors can be provided separately without adding the Mask process, thereby simplifying the display panel process, and at the same time ensuring that the cathode wiring 31 has a sufficient width in the row direction X, thereby reducing the transmission loss on the cathode wiring 31.

[0090] The insulation between different cathode wirings 31 can be achieved by physically laying them separately and not connecting them to each other. The cathode voltages on the cathode wirings 31 overlapped by the cathodes 43 of the sub-pixels 40 of different colors can be supplied by different output ports of the driver chip. For example, each cathode wiring 31 can be set to correspond to a different output port connected to the driver chip. Alternatively, since the cathode voltages on the cathode wirings 31 overlapped by the sub-pixels 40 of the same color can be the same, in order to reduce the demand for the number of output ports of the driver chip, at least some of the cathode wirings 31 overlapping the sub-pixels 40 of the same color can also be set to be connected to the same output port of the driver chip, and the connection method between the driver chip port and each cathode wiring 31 can be set based on the driving capability of the chip port. It can be understood that, in the display area, the cathode wirings 31 are insulated from each other and are not connected to each other, so as to achieve single-sided overlap between the cathode 43 of each sub-pixel 40 and the cathode wiring 31; outside the display area, for example, in the fan-out area, if necessary, an electrical connection can be set between the cathode wirings 31 connected to the same output port of the driver chip, so that each cathode wiring 31 can normally transmit the cathode voltage required by the cathode 43 to which it is connected.

[0091] In the display panel provided by the embodiment of the present invention, the cathode wiring layer 30 is arranged on the side of the pixel definition layer 20 away from the substrate 10, and includes a plurality of cathode wirings 31 extending along the column direction Y, and the cathode 43 of each sub-pixel 40 is arranged to overlap only with the cathode wiring 31 arranged on one side of the sub-pixel 40 along the row direction X. In this way, there is no need to set a cross-wire located in other film layers, nor is there a need to cut the cathode wiring 31 after overlapping, and the cathode 43 can be overlapped on one side with the cathode wiring 31 without increasing the process, which is conducive to the overlap of the cathodes 43 of the sub-pixels 40 of different colors with different cathode wirings 31. In addition, by setting the cathode wirings 31 overlapped by the cathodes of the sub-pixels 40 of different colors to be insulated and not connected to each other, the cathode voltages of the sub-pixels 40 of different colors can be provided separately without affecting each other, so as to meet the driving requirements of the sub-pixels 40 of different colors. In summary, the embodiment of the present invention can supply cathode voltages to the sub-pixels 40 of different colors separately, thereby improving the display effect of the display panel.

[0092] On the basis of the above-mentioned embodiments, there are various optional overlapping modes of the cathode 43 and the cathode wiring 41 , several of which are described below, but are not intended to limit the present invention.

[0093] See also Figure 1In one embodiment, the cathode wiring 31 of the display area may be optionally set to be rectangular in shape on the XOY cross section. Along the row direction X, one side of the cathode 43 may be set to overlap with the cathode wiring 31, and the other side may not overlap with the cathode wiring 31; and, along the column direction Y, both sides of the cathode 43 may not overlap with the cathode wiring 31. In this way, the structure of the cathode wiring 31 can be simplified. And along the column direction Y, there is no cathode wiring 31 distributed between two adjacent sub-pixels 40, which can provide more space for the layout of other functional film layers.

[0094] See also Figure 3 In another embodiment, the cathode wiring 31 of the display area may be set to be C-shaped on the XOY cross section corresponding to each sub-pixel 40 position to be overlapped. Along the row direction X, one side of the cathode 43 may be overlapped with the cathode wiring 31, and the other side may not be overlapped with the cathode wiring 31; and, along the column direction Y, both sides of the cathode 43 may be overlapped with the cathode wiring 31. In this way, the overlap area between the cathode 43 and the cathode wiring 31 may be larger, which is conducive to improving the overlap reliability.

[0095] In summary, the sub-pixel 40 located above the pixel definition layer 20, or the sub-pixel 40 located outside the pixel opening 21, may include an overlap area and a non-overlap area. The portion of the cathode 43 of the sub-pixel 40 located in the overlap area overlaps the cathode wiring 31, and the portion of the cathode 43 of the sub-pixel 40 located in the non-overlap area does not overlap the cathode wiring 31. For example, see Figure 1 , along the row direction X, one side (e.g., the left side) of the sub-pixel 40 is located in the overlap region, and the other side (e.g., the right side) is located in the non-overlap region; along the column direction Y, both sides of the sub-pixel are located in the non-overlap region. Alternatively, see Figure 3 Along the row direction X, one side (eg, the left side) of the sub-pixel 40 is located in the overlap region, and the other side (eg, the right side) is located in the non-overlap region; along the column direction Y, both sides of the sub-pixel are located in the overlap region.

[0096] On the basis of the above-mentioned embodiments, optionally, the spacing between each two adjacent pixel openings 21 along the row direction X can be set to be equal; and the spacing between each two adjacent pixel openings 21 along the column direction Y can be set to be equal; so as to achieve uniform arrangement of each sub-pixel 40 on the display panel and improve the display effect of the display panel.

[0097] Continue to see Figure 2 On the basis of the above embodiments, optionally, the display panel further includes: a pixel encapsulation layer 50, which is arranged on the side of the cathode 43 of the sub-pixel 40 away from the substrate 10, for example, arranged above the cathode 43. The pixel encapsulation layer 50 includes: a plurality of pixel encapsulation structures 51, which respectively cover the cathode 43 of each sub-pixel 40.

[0098] The overlapping area corresponding to the sub-pixel 40 (eg Figure 2 The cathode 43 overlaps with the cathode wiring 31, for example, overlaps with the side wall and the top of the cathode wiring 31; the pixel encapsulation structure 51 completely covers the cathode 43 and overlaps with the top of the cathode wiring 31. In the non-overlapping area corresponding to the sub-pixel 40, the cathode 43 does not overlap with the cathode wiring 31; the pixel encapsulation structure 51 completely covers the cathode 43 and overlaps with the top of the pixel definition layer 20.

[0099] The pixel definition layer 20 can be made of insulating material. Compared with the pixel packaging structure 51 being overlapped to the cathode wiring 31, the pixel packaging structure 51 being overlapped to the pixel definition layer 20 can achieve a better packaging effect and can effectively prevent water and oxygen from corroding the cathode 43. Therefore, it is preferred to refer to Figure 1 The cathode wiring 31 is arranged such that along the row direction X, one side of the sub-pixel 40 is located in the overlap area and the other side is located in the non-overlap area; along the column direction Y, both sides of the sub-pixel are located in the non-overlap area. Figure 1 The schematic diagram of the cross-sectional structure of C-C' can be found in Figure 4 , along the column direction Y, on both sides of the sub-pixel 40, the pixel encapsulation structure 51 completely covers the cathode 43 and overlaps to the top of the pixel definition layer 20, so as to achieve a better pixel encapsulation effect.

[0100] On the basis of the above-mentioned embodiments, optionally, there are various specific overlapping structures for the single-side overlapping of the cathode 43 and the cathode wiring 31 , and several of them are exemplarily described below.

[0101] See also Figure 2In one embodiment, optionally, in the overlapped area, the cathode 43 of the sub-pixel 40 covers the light-emitting layer 42 of the sub-pixel 40 and partially covers the cathode wiring 31. If there is a gap between the light-emitting layer 42 of the sub-pixel 40 and the adjacent cathode wiring 31, the cathode 43 can also cover the gap; that is, the cathode 43 of the sub-pixel 40 extends from the bottom of the pixel opening 21 to the top of the pixel definition layer 20 and continues to extend to the position where the cathode wiring overlaps. In the non-overlapped area, the cathode 43 of the sub-pixel 40 does not overlap with the cathode wiring 31, for example, the cathode 43 can partially cover the light-emitting layer 42 of the sub-pixel 40; that is, the cathode 43 of the sub-pixel 40 extends from the bottom of the pixel opening 21 to the top of the pixel definition layer 20, and stops extending when it does not completely cover the light-emitting layer 42. Since there is a gap between the light-emitting layer 42 and the adjacent cathode wiring 31, the cathode 43 cannot overlap with the cathode wiring 31 when it does not completely cover the light-emitting layer 42. In this way, the cathode 43 can be overlapped on one side with the cathode wiring 31. Exemplarily, the structure provided in this embodiment can be realized by adjusting the evaporation angle of the cathode 43. For example, corresponding to the overlapping area of ​​the sub-pixel, the evaporation angle of the cathode 43 can be set to be greater than the evaporation angle of the light-emitting layer 42, so that the cathode material can be evaporated to a larger area than the light-emitting layer 42; corresponding to the non-overlapping area of ​​the sub-pixel 40, the evaporation angle of the cathode 43 can be set to be less than the evaporation angle of the light-emitting layer 42, so that the cathode material can only be evaporated to a smaller area than the light-emitting layer 42. See Figure 2 , each cathode 43 may be arranged to overlap the cathode wiring 31 only on the left side of the sub-pixel 40 to achieve single-side overlap.

[0102] On the basis of the above-mentioned embodiment, optionally, for the cathode wiring 31 having only one side overlapping with the cathode 43 of the sub-pixel 40 along the row direction, the distances between the two sides of the cathode wiring 31 and the respective adjacent pixel openings 21 along the row direction X can be set to be equal. Alternatively, the side where the cathode wiring 31 overlaps with the cathode 43 is recorded as the overlapping side, and the side that does not overlap with the cathode 43 is recorded as the non-overlapping side. The distance db between the overlapping side of the cathode wiring 31 and the adjacent pixel opening 21 can also be set to be smaller than the distance da between the non-overlapping side of the cathode wiring 31 and the adjacent pixel opening 21, so that the non-overlapping side is farther away from the cathode 43 close to the non-overlapping side, ensuring that the non-overlapping side does not overlap with the cathode 43. It can be understood that, along the row direction X, the distance between one side of the cathode wiring 31 and its adjacent pixel opening 21 refers to the vertical distance between the side wall of the cathode wiring 31 and the edge of the pixel opening 21 closest to this side of the cathode wiring 31; the pixel opening 21 can be considered as the opening area defined by the bottom of the pixel definition layer 20.

[0103] Figure 5 is a structural schematic diagram of another display panel provided by an embodiment of the present invention; Figure 6 It is a kind of Figure 5 Schematic diagram of the cross-sectional structure along the line D-D'. Figure 5 and Figure 6 In another embodiment, optionally, for the cathode wiring 31 that overlaps with the cathode 43 of the sub-pixel 40 on only one side along the row direction X, the distance db between the overlapping side of the cathode wiring 31 and the adjacent pixel opening 21 is smaller than the distance da between the non-overlapping side of the cathode wiring 31 and the adjacent pixel opening 21. In this way, the non-overlapping side of the cathode wiring 31 is farther from the cathode 43 than the overlapping side, ensuring that the non-overlapping side does not overlap with the cathode 43. Exemplarily, the structure given in this embodiment can be achieved by limiting the position of the cathode wiring 31 when preparing the cathode wiring layer 30. Figure 6 For example, the right side of the cathode 43 of each sub-pixel 40 and the right side of the pixel encapsulation structure 51 are not connected to the cathode wiring 31, and only the left side of the cathode 43 of each sub-pixel 40 and the left side of the pixel encapsulation structure 51 are connected to the cathode wiring 31, so that the cathode voltage of different sub-pixels 40 in the same row can be transmitted separately. In this embodiment, the cathode 43 of the sub-pixel 40 is connected to the cathode wiring 31 on one side by the differentiated design of the distance from the two sides of the cathode wiring 31 to the pixel opening 21.

[0104] On the basis of the above-mentioned embodiment, optionally, the cathode 43 in the overlapping area and the non-overlapping area of ​​the sub-pixel 40 can be evaporated at the same evaporation angle to simplify the preparation process of the cathode 43. Then, in the sub-pixel 40 finally obtained, in the overlapping area, the cathode 43 of the sub-pixel 40 covers the light-emitting layer 42 of the sub-pixel 40 and partially covers the cathode wiring 31; if there is a gap between the light-emitting layer 42 of the sub-pixel 40 and the adjacent cathode wiring 31, the cathode 43 can also cover the gap, and in the non-overlapping area, the cathode 43 of the sub-pixel 40 does not overlap with the cathode wiring 31, and the cathode 43 of the sub-pixel 40 can cover the light-emitting layer 42 of the sub-pixel and overlap to the top of the pixel definition layer 20. That is to say, in this embodiment, the cathode 43 of the sub-pixel 40 completely covers the light-emitting layer 42, in the overlapping area, the cathode 43 extends to overlap with the cathode wiring 31, and in the non-overlapping area, the cathode overlaps to the pixel definition layer 20.

[0105] Based on the differentiated design of the distances from the two sides of the cathode wiring 31 to the pixel opening 21, optionally, the cathode evaporation angle can be adjusted so that the cathode 43 on the non-overlapping side does not completely cover the light-emitting layer 42, so as to ensure that in the non-overlapping area of ​​the sub-pixel 40, the cathode 43 does not overlap with the non-overlapping side of the cathode wiring 31.

[0106] On the basis of the above-mentioned embodiments, optionally, the cathodes 43 of the sub-pixels 40 of the same color in each column of sub-pixels 40 may be connected to the same cathode wiring 31 to simplify the wiring of the display panel.

[0107] Exemplarily, the colors of the sub-pixels 40 in the same column are the same, and the cathodes 43 of the sub-pixels 40 in the same column are all connected to the same cathode wiring 31. Then, the cathode wiring 31 can be set in a one-to-one correspondence with the sub-pixel columns. On this basis, optionally, along the row direction X, a cathode wiring 31 can be set on the first side of each column of sub-pixels 40, and the cathodes 43 of each column of sub-pixels 40 are all connected to the cathode wiring 31 set on the first side of the sub-pixels 40 in this column. Figure 1 and Figure 5 As shown, illustratively, the first side of the sub-pixel 40 may be the left side of the sub-pixel 40, or the first side of the sub-pixel 40 may also be the right side of the sub-pixel 40. In this embodiment, by arranging each column of sub-pixels 40 to overlap with the cathode wiring 31 arranged on the same side, uniform arrangement of the sub-pixels 40 and uniform wiring of the cathode wiring 31 can be achieved, which is conducive to ensuring the consistency of the manufacturing process of each position of the display panel and improving the display uniformity of the display panel.

[0108] On the basis of the above embodiments, optionally, the plurality of sub-pixels 40 include: a plurality of first color sub-pixels, a plurality of second color sub-pixels, and a plurality of third color sub-pixels; the colors of the sub-pixels 40 in each column are the same; along the row direction X of the display panel, the first color sub-pixels, the second color sub-pixels, and the third color sub-pixels are alternately arranged, for example, repeatedly arranged in the order of the first color sub-pixels, the second color sub-pixels, and the third color sub-pixels. Exemplarily, the luminous color of the first color sub-pixels is red, the luminous color of the second color sub-pixels is green, and the luminous color of the third color sub-pixels is blue, forming the following Figure 1 RGB arrangement as shown. In this way, the cathodes of all sub-pixels 40 can be overlapped only on the left side to the cathode wiring 31, and the cathode wirings 31 are not connected to each other, so that the individual transmission of the cathode voltages of the R / G / B sub-pixels can be achieved. In the positions where the cathode wiring 31 is not arranged between the sub-pixels, for example, between every two adjacent pixel openings 21 along the column direction Y, the encapsulation between the sub-pixels is achieved by directly overlapping the pixel encapsulation structure 51 and the pixel definition layer 20, which can effectively improve the pixel encapsulation effect.

[0109] The above-mentioned embodiments exemplarily provide a type of overlapping method under a pixel arrangement, but are not intended to limit the present invention. The structure of the cathode 43 and the cathode wiring 31 being overlapped on one side provided in the embodiment of the present invention is also applicable to other pixel arrangements. For example, when the sub-pixels 40 in the same column include sub-pixels 40 of two colors, two cathode wirings 31 may be arranged on both sides of a column of sub-pixels 40 along the row direction X; and in the sub-pixels 40 in the same column: the cathode 43 of each sub-pixel 40 of one color is overlapped to the cathode wiring 31 located on one side of the sub-pixel 40 in this column, and the cathode 43 of each sub-pixel 40 of another color is overlapped to the cathode wiring 31 located on the other side of the sub-pixel 40 in this column, so as to realize the overlap of the sub-pixels 40 of the same color in a column with the same cathode wiring 31. Alternatively, along the row direction X, when the left and right sides of the same cathode wiring 31 are sub-pixels 40 of the same color, the cathodes 43 of the two columns of sub-pixels 40 can also be set to be overlapped to the same cathode wiring 31, which also satisfies the single-sided overlap of the cathode 43 of each sub-pixel 40; specifically, the sub-pixel 40 located on the left side of the cathode wiring 31 can overlap the right side of the cathode 43 to the cathode wiring 31, and the sub-pixel 40 located on the right side of the cathode wiring 31 can overlap the left side of the cathode 43 to the cathode wiring 31.

[0110] On the basis of the above embodiments, optionally, along the row direction X, the width dc of each cathode line 31 is ≥2 μm, preferably ≥3 μm, to ensure reliable transmission of the cathode voltage and minimize transmission loss on the cathode line 31 .

[0111] On the basis of the above-mentioned embodiments, optionally, the cathode wirings 31 overlapped by the sub-pixels 40 of the same color may be electrically connected so that the cathodes 43 of the sub-pixels 40 of the same color receive the same cathode voltage.

[0112] An embodiment of the present invention further provides a display panel, which may include: a substrate, a pixel definition layer, a cathode wiring layer and a plurality of sub-pixels. The pixel definition layer is arranged on one side of the substrate; the pixel definition layer defines a plurality of pixel openings arranged in an array surrounded by the pixel definition layer. A plurality of sub-pixels are arranged corresponding to each pixel opening, respectively; the sub-pixel includes a cathode. The cathode wiring layer is arranged on a side of the pixel definition layer away from the substrate. The cathode wiring layer includes a plurality of cathode wirings extending along the column direction of the display panel and arranged along the row direction of the display panel. In the row direction, only one side of each cathode wiring overlaps with the cathode of the sub-pixel. The sub-pixels overlapped by a cathode wiring have the same color, and different cathode wirings overlapped to sub-pixels of different colors are insulated.

[0113] In the display panel provided by the embodiment of the present invention, a cathode wiring layer is arranged on the side of the pixel definition layer away from the substrate, and the cathode wiring layer includes a plurality of cathode wirings extending in the column direction and arranged in the row direction, and each cathode wiring is arranged to overlap with the cathode of the sub-pixel on only one side in the row direction, so that each cathode wiring can transmit a cathode voltage to the connected sub-pixel individually. In addition, by setting the colors of the sub-pixels overlapped by a cathode wiring to be the same, and insulating the different cathode wirings overlapped to the sub-pixels of different colors, the cathode voltages of the sub-pixels of different colors can be provided separately by different cathode wirings, thereby meeting the driving requirements of the sub-pixels of different colors. In summary, the embodiment of the present invention can supply cathode voltages to the sub-pixels of different colors separately, thereby improving the display effect of the display panel.

[0114] On the basis of the above embodiments, optionally, the distance between the overlapping side of the cathode wiring and the adjacent pixel opening is less than or equal to the distance between the non-overlapping side of the cathode wiring and the adjacent pixel opening, and the specific distance difference can be set accordingly according to actual needs and preparation process, and is not limited here. It can be understood that along the row direction, the overlapping side of the cathode wiring is the side where the cathode wiring overlaps with the cathode, and the non-overlapping side is the side where the cathode wiring does not overlap with the cathode.

[0115] On the basis of the above embodiments, the display panel may further include: a pixel encapsulation layer, which is arranged on the side of the cathode of the sub-pixel away from the substrate; and the pixel encapsulation layer covers the cathode of each sub-pixel. Wherein, on the overlapping side of the cathode wiring, the pixel encapsulation layer overlaps with the top of the cathode wiring, so as to realize the pixel encapsulation of the sub-pixel close to the overlapping side of the cathode wiring. In the case where a cathode wiring is arranged between two adjacent columns of sub-pixels, on the non-overlapping side of the cathode wiring, the pixel encapsulation layer overlaps with the top of the pixel definition layer, or overlaps with the top of the pixel definition layer and the top of the cathode wiring, so as to realize the pixel encapsulation of the sub-pixel close to the non-overlapping side of the cathode wiring.

[0116] On the basis of the above embodiments, optionally, the colors of the sub-pixels in the same column are the same, and the overlapping side of the same cathode wiring overlaps the cathodes of the entire column of sub-pixels, so that the cathode wiring can be set in one-to-one correspondence with the sub-pixel column, effectively simplifying the panel wiring. On this basis, optionally, along the row direction, the same side of each cathode wiring can be set as the overlapping side, which is used to overlap the cathodes of a column of sub-pixels, so as to achieve uniform arrangement of sub-pixels and uniform wiring of cathode wiring layers, which is conducive to ensuring the consistency of the preparation process of each position of the display panel and improving the display uniformity of the display panel. Alternatively, along the row direction, when the cathode wirings located on both sides of a column of sub-pixels transmit the same cathode voltage, the two sides of the sub-pixels can also be set to overlap with the two cathode wirings respectively to ensure the reliable supply of cathode voltage; specifically, the right side of the cathode wiring located on the left side of a column of sub-pixels is the overlapping side, which overlaps with the cathodes of the sub-pixels in the column, and the left side of the cathode wiring located on the right side of a column of sub-pixels is the overlapping side, which overlaps with the cathodes of the sub-pixels in the column.

[0117] An embodiment of the present invention further provides a method for preparing a display panel, which can be used to prepare the display panel provided by any embodiment of the present invention and has corresponding beneficial effects. Figure 7 is a schematic flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention; Figure 8 is a schematic diagram of the structure of a display panel in S110-S160 provided by an embodiment of the present invention. Figure 7 and Figure 8 , the method for preparing the display panel comprises:

[0118] S110, providing a substrate.

[0119] The substrate 10 may include a stacked substrate and an array layer, the material of the substrate is, for example, an insulating material such as glass or polyimide, the array layer is arranged above the substrate, and the pixel circuit of each sub-pixel is arranged in the array layer.

[0120] S120, preparing an anode layer on one side of the substrate.

[0121] The anode layer includes an anode 41 of each sub-pixel. Exemplarily, the material of the anode layer is a metal material such as aluminum, silver, titanium or molybdenum or its alloy material, or a metal oxide such as indium tin oxide, or other non-metallic materials with good conductivity. The anode layer can be laid on the substrate 10 in a whole layer by evaporation, sputtering or deposition, and then the anode 41 of each sub-pixel is obtained by patterning. For example, the process of mask plate + photolithography + dry etching / wet etching is used to remove the part of the anode material layer except the anode 41.

[0122] S130, preparing a pixel definition layer on one side of the substrate.

[0123] The pixel definition layer 20 and the anode layer are arranged on the same side of the substrate 10; the pixel definition layer 20 defines a plurality of pixel openings 21 surrounded by the pixel definition layer 20, and each sub-pixel is arranged corresponding to each pixel opening 21. Each anode 41 and each pixel opening 21 can be arranged one by one. The pixel definition layer 20 can be made of an insulating material, such as an organic material or an inorganic material. The pixel definition layer 20 can be prepared by a whole layer laying + patterning process.

[0124] S140, preparing a cathode wiring layer on a side of the pixel definition layer away from the substrate.

[0125] The cathode wiring layer 30 partially covers the side of the pixel definition layer 20 away from the substrate 10, and the cathode wiring layer 30 includes a plurality of cathode wirings 31 extending along the column direction of the display panel, and at least some of the cathode wirings 31 are insulated from each other. The material of the cathode wiring layer 30 is a metal material such as aluminum, silver, titanium or molybdenum or its alloy material, or a metal oxide such as indium tin oxide, or other non-metallic materials with good electrical conductivity. The cathode wiring layer 30 can be prepared by a whole layer laying + patterning process.

[0126] S150, preparing an isolation structure layer on a side of the cathode wiring layer away from the pixel definition layer.

[0127] The isolation structure layer 60 includes an isolation column 610 surrounding each pixel opening 21. Exemplarily, the isolation structure layer 60 may include a first isolation layer 61 and a second isolation layer 62 stacked in sequence in a direction away from the substrate 10. The isolation column 610 is in an inverted trapezoidal shape as a whole, that is, a structure with a large upper layer and a small lower layer. The orthographic projection of the first isolation layer 61 on the substrate 10 is located within the orthographic projection of the second isolation layer 62 on the substrate 10, and the orthographic projection area of ​​the first isolation layer 61 on the substrate 10 is smaller than the orthographic projection area of ​​the second isolation layer 62 on the substrate 10. The isolation structure layer 60 is disposed on the cathode wiring layer 30 to isolate the light-emitting layers of different sub-pixels and to isolate the cathodes of different sub-pixels, so as to complete the evaporation of the light-emitting layer and cathode of each sub-pixel without using a fine mask, thereby reducing the preparation cost. Exemplarily, the first isolation layer 61 can be prepared by a whole-layer laying + patterning process, and then the second isolation layer 62 can be prepared by a whole-layer laying + patterning process, and then the exposed sidewalls of the first isolation layer 61 are etched to make the second isolation layer 62 present a brim shape, so as to ensure that the light-emitting layer material and the cathode material between adjacent pixel openings 21 can be separated by the isolation column 610 and not connected during subsequent evaporation. In other embodiments, optionally, the isolation structure layer 60 can also include a third isolation layer or even more isolation layers, as long as the orthographic projection of the isolation layer on one side of the principle substrate 10 is covered and greater than the orthographic projection of the isolation layer on the side close to the substrate 10, the isolation effect can be achieved. Exemplarily, the material of each isolation layer can be selected as an insulating or conductive material as needed, and no specific limitation is made here.

[0128] S160 , based on the isolation function of the isolation column, evaporate the light-emitting layer and cathode of each sub-pixel in each pixel opening to form each sub-pixel.

[0129] The cathodes 43 of each sub-pixel in the row direction of the display panel are respectively overlapped with different cathode wirings 31. For example, the cathode 43 of each sub-pixel is only overlapped with the cathode wiring 31 arranged on one side of the sub-pixel along the row direction of the display panel. Exemplarily, the cathodes 43 of sub-pixels of different colors are respectively overlapped with different cathode wirings 31, and the cathode wirings 31 overlapped by the cathodes 43 of sub-pixels of different colors are insulated from each other. Figure 8 The red, green and blue sub-pixels are exemplarily shown in FIG. 1 . The light-emitting layers 42 of sub-pixels of different colors are made of different materials, while the anode 41 and cathode 43 can be made of the same material.

[0130] The embodiment of the present invention realizes the preparation of the display panel through S110-S160, by setting the cathode wiring layer 30 to be located on the side of the pixel definition layer 20 away from the substrate 10, and including a plurality of cathode wirings 31 extending in the column direction, and setting the cathode 43 of each sub-pixel to overlap only with the cathode wiring 31 set on one side of the sub-pixel in the row direction. In this way, there is no need to set a cross-wire located in other film layers, nor is there a need to cut the cathode wiring 31 after overlapping (for example, patterning the isolation structure layer 60 and the cathode wiring layer 30), and the single-sided overlap of the cathode 43 and the cathode wiring 31 can be achieved without increasing the process, which is conducive to achieving the overlap of the cathodes 43 of sub-pixels of different colors with different cathode wirings 31. In addition, by setting the cathode wirings 31 overlapped by the cathodes of sub-pixels of different colors to be insulated and not connected to each other, the cathode voltages of sub-pixels of different colors can be provided separately without affecting each other, so as to meet the driving requirements of sub-pixels of different colors.

[0131] Figure 9-10 is a schematic diagram of the structure of a display panel in each step of preparing a red sub-pixel according to an embodiment of the present invention, see Figure 9-10 On the basis of the above embodiments, optionally, the above S160 specifically includes: forming sub-pixels of different colors in sequence. In the figure, for example, the pixel opening corresponding to the red sub-pixel is the first pixel opening 21R, the pixel opening corresponding to the green sub-pixel is the second pixel opening 21G, and the pixel opening corresponding to the blue sub-pixel is the third pixel opening 21B. Figure 9-10 , taking the target color sub-pixel as a red sub-pixel as an example, the formation process of the target color sub-pixel specifically includes:

[0132] S210 , evaporating a light-emitting material of a target color sub-pixel on a side of the anode layer away from the substrate 10 to form a target color light-emitting material layer 421 .

[0133] S220 , evaporating a cathode material of a sub-pixel on a side of the target color light-emitting material layer 421 away from the anode layer to form a cathode material layer 431 .

[0134] S230 , depositing a first inorganic material on a side of the cathode material layer 431 away from the target color light-emitting material layer 421 to form a first inorganic material layer 511 .

[0135] S240 , forming a photoresist 90 on a side of the first inorganic material layer 511 away from the cathode material layer 431 , corresponding to a position of a pixel opening where a target color sub-pixel is located.

[0136] Specifically, this step may be: coating a whole layer of photoresist on the side of the first inorganic material layer 511 away from the cathode material layer 431, and exposing and developing the photoresist at positions other than the pixel openings (here, each first pixel opening 21R) where the target color sub-pixel is located, and only retaining the photoresist 90 at the pixel opening position where the target color sub-pixel is located.

[0137] S250 , removing the first inorganic material, cathode material, and light-emitting material except for the portion covered by the photoresist 90 .

[0138] The first inorganic material, cathode material and light-emitting material in the area covered by the photoresist 90 are retained to form a target color sub-pixel and a pixel encapsulation structure 51 thereof.

[0139] S260, removing the photoresist.

[0140] In this embodiment, a sub-pixel of a target color is obtained through S210-S260. After the sub-pixel of a target color is prepared, the same process can be used to prepare the sub-pixel of the next target color until the sub-pixels of all colors are prepared, thereby completing the preparation of each sub-pixel. Among them, all the first inorganic materials retained in the process of forming each sub-pixel constitute a pixel encapsulation layer, that is, the pixel encapsulation structures 51 of all sub-pixels together constitute a pixel encapsulation layer.

[0141] On the basis of the above-mentioned implementation modes, optionally, the single-sided overlap between the sub-pixel cathode and the cathode wiring can be realized based on different specific preparation processes, which are exemplarily described below.

[0142] In one embodiment, optionally, evaporating the light emitting layer and cathode of each sub-pixel in each pixel opening respectively includes: for any sub-pixel:

[0143] Corresponding to the overlapping area of ​​the sub-pixel, the evaporation angle of the cathode 43 is set to be greater than the evaporation angle of the light-emitting layer 42; corresponding to the non-overlapping area of ​​the sub-pixel, the evaporation angle of the cathode 43 is set to be less than the evaporation angle of the light-emitting layer 42.

[0144] The light-emitting layer 42 and the cathode 43 are sequentially evaporated according to the set evaporation angle, so that in the overlapped area, the cathode 43 of the sub-pixel covers the light-emitting layer 42 of the sub-pixel; if there is a gap between the light-emitting layer 42 of the sub-pixel and the cathode wiring 31, the cathode 43 also covers the gap, and the cathode 43 also partially covers the cathode wiring 31; in the non-overlapped area, the cathode 43 of the sub-pixel does not overlap with the cathode wiring 31, and the cathode 43 can partially cover the light-emitting layer 42 of the sub-pixel, forming the following Figure 2 The structure shown.

[0145] In another embodiment, optionally, a cathode wiring layer is prepared on a side of the pixel definition layer away from the substrate, comprising:

[0146] A cathode wiring material is deposited on a side of the pixel definition layer 20 away from the substrate 10 to form a cathode wiring material layer.

[0147] The cathode wiring material layer is patterned to form a cathode wiring layer 30; wherein, for a cathode wiring 31 having only one side overlapped with the cathode 43 of the sub-pixel along the row direction, a distance between the overlapped side of the cathode wiring 31 and the adjacent pixel opening 21 is set to be smaller than a distance between the non-overlapped side of the cathode wiring 31 and the adjacent pixel opening 21, forming the following Figure 6 The structure shown.

[0148] Fig.11 Schematic diagram of the structure of a display panel in S170-S190 provided by an embodiment of the present invention. Fig.11 On the basis of the above embodiments, optionally, after forming each sub-pixel, a pixel encapsulation layer may be formed on a side of each sub-pixel away from the substrate 10, and the pixel encapsulation layer includes a plurality of pixel encapsulation structures 51 corresponding to each sub-pixel. After forming the pixel encapsulation layer, the method for preparing a display panel further includes:

[0149] S170, removing the isolation structure layer.

[0150] Among them, when the top of the cathode wiring layer 30 is higher than the top of the pixel encapsulation structure 51, the isolation structure layer 60 can be directly prepared on the cathode wiring layer 30. Since the bottom of the isolation structure layer 60 is higher than the top of the pixel encapsulation structure 51, the pixel encapsulation layer 50 can be retained while removing the isolation structure layer 60 at a convenient time. Alternatively, when the top of the cathode wiring layer 30 is lower than the top of the pixel encapsulation structure 51, a sacrificial layer can be first formed on the top of the cathode wiring layer 30, and then the isolation structure layer 60 can be prepared on the top of the sacrificial layer. In this step, the sacrificial layer can be removed together with the isolation structure layer 60. The sacrificial layer can be prepared, for example, using an easily peelable material, and specifically, the adhesion between the sacrificial layer and the cathode wiring layer 30 can be set to be lower than the adhesion between the sacrificial layer and the isolation structure layer 60.

[0151] S180 , preparing an organic encapsulation layer 70 on a side of the pixel encapsulation layer 50 away from the substrate 10 .

[0152] The organic encapsulation layer 70 can be used to improve the bending resistance of the panel, and the organic encapsulation layer 70 can be an inkjet printing (IJP) layer. Removing the isolation structure layer after the sub-pixel is evaporated can make the top of the pixel definition layer 20 flat, and the structure without isolation columns can make the organic encapsulation layer 70 easier to level, and without the shielding of isolation columns, the light emitting range of the sub-pixel can be diffused and the viewing angle can be widened.

[0153] S190 , preparing an inorganic encapsulation layer 80 on a side of the organic encapsulation layer 70 away from the pixel encapsulation layer 50 .

[0154] The pixel encapsulation layer 50 , the organic encapsulation layer 70 and the inorganic encapsulation layer 80 form an inorganic-organic-inorganic encapsulation structure, which has a good water and oxygen barrier effect.

[0155] An embodiment of the present invention further provides a display device, including the display panel provided by any embodiment of the present invention, and having corresponding beneficial effects.

[0156] 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.

[0157] 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: include: substrate; A pixel definition layer is disposed on one side of the substrate; The pixel definition layer defines a plurality of pixel openings surrounded by the pixel definition layer; a cathode wiring layer, partially covering a side of the pixel definition layer away from the substrate; the cathode wiring layer comprises a plurality of cathode wirings extending along a column direction of the display panel, at least some of the cathode wirings being insulated from each other; A plurality of sub-pixels are respectively arranged corresponding to the pixel openings; the sub-pixels include cathodes; and the cathodes of the sub-pixels in the row direction of the display panel are respectively overlapped with different cathode wirings.

2. The display panel according to claim 1, characterized in that: The sub-pixel further includes a light-emitting layer, which is disposed on a side of the cathode of the sub-pixel close to the substrate; the light-emitting layer and the cathode of the sub-pixel both extend from the bottom of the pixel opening to the top of the pixel definition layer; The portion of the sub-pixel located above the pixel definition layer includes an overlap area and a non-overlap area; in the overlap area, the cathode of the sub-pixel covers the light-emitting layer of the sub-pixel and partially covers the cathode wiring; in the non-overlap area, the cathode of the sub-pixel does not overlap with the cathode wiring; Preferably, one cathode wiring is arranged between two adjacent columns of sub-pixels, and along the row direction, the distances between two sides of the cathode wiring and respective adjacent pixel openings are equal.

3. The display panel according to claim 1, characterized in that: For a cathode line that overlaps with the cathode of the sub-pixel on only one side along the row direction, a distance between the overlapping side of the cathode line and an adjacent pixel opening is smaller than a distance between a non-overlapping side of the cathode line and an adjacent pixel opening; Preferably, the sub-pixel further comprises a light-emitting layer, which is arranged on a side of the cathode of the sub-pixel close to the substrate; the light-emitting layer and the cathode of the sub-pixel both extend from the bottom of the pixel opening to the top of the pixel definition layer; The portion of the sub-pixel located above the pixel definition layer includes an overlapping area and a non-overlapping area; in the overlapping area, the cathode of the sub-pixel covers the light-emitting layer of the sub-pixel and partially covers the cathode wiring; in the non-overlapping area, the cathode of the sub-pixel does not overlap with the cathode wiring, the cathode of the sub-pixel covers the light-emitting layer of the sub-pixel, and overlaps to the top of the pixel definition layer.

4. The display panel according to claim 2 or 3, characterized in that: Also includes: A pixel encapsulation layer is disposed on a side of the cathode of the sub-pixel away from the substrate; The pixel encapsulation layer comprises: a plurality of pixel encapsulation structures, each corresponding to and covering the cathode of each sub-pixel; Wherein, corresponding to the overlapping area, the pixel encapsulation structure overlaps with the top of the cathode wiring; corresponding to the non-overlapping area, the pixel encapsulation structure overlaps with the top of the pixel definition layer; Preferably, along the row direction, one side of the sub-pixel is located in the overlapping area, and the other side is located in the non-overlapping area; along the column direction, both sides of the sub-pixel are located in the non-overlapping area.

5. The display panel according to any one of claims 1 to 3, characterized in that: The cathode of each sub-pixel is only overlapped with the cathode wiring arranged on one side of the sub-pixel along the row direction; wherein the cathodes of sub-pixels of different colors are respectively overlapped with different cathode wirings, and the cathode wirings overlapped with the cathodes of sub-pixels of different colors are insulated from each other; Preferably, the cathodes of the sub-pixels of the same color in each column of the sub-pixels are connected to the same cathode wiring; Preferably, the colors of the sub-pixels in the same column are the same; Preferably, along the row direction, a cathode wiring is arranged on the first side of each column of the sub-pixels, and the cathodes of the sub-pixels in each column are overlapped with the cathode wiring arranged on the first side of the sub-pixels in the column; Preferably, the plurality of sub-pixels include: a plurality of first color sub-pixels, a plurality of second color sub-pixels and a plurality of third color sub-pixels; along the row direction of the display panel, the first color sub-pixels, the second color sub-pixels and the third color sub-pixels are alternately arranged; Preferably, the light emitting color of the first color sub-pixel is red, the light emitting color of the second color sub-pixel is green, and the light emitting color of the third color sub-pixel is blue; Preferably, the cathode wirings overlapped by the sub-pixels of the same color are electrically connected.

6. The display panel according to claim 1, characterized in that: Along the row direction, the width of each cathode wiring is ≥2 μm; Preferably, along the row direction, the width of each cathode wiring is ≥3 μm; Preferably, the row direction is a scanning direction of the display panel, and the sub-pixels in the same row are scanned simultaneously.

7. A display panel, characterized in that: include: substrate; A pixel definition layer is disposed on one side of the substrate; The pixel definition layer defines a plurality of pixel openings arranged in an array and surrounded by the pixel definition layer; A plurality of sub-pixels are respectively arranged corresponding to the pixel openings; the sub-pixels include cathodes; A cathode wiring layer is arranged on a side of the pixel definition layer away from the substrate; the cathode wiring layer includes a plurality of cathode wirings extending along the column direction of the display panel and arranged along the row direction of the display panel; wherein, along the row direction, only one side of each cathode wiring is overlapped with the cathode of the sub-pixel; the sub-pixels overlapped by one cathode wiring have the same color, and different cathode wirings overlapped to sub-pixels of different colors are insulated.

8. The display panel according to claim 7, characterized in that: The distance between the overlapping side of the cathode wiring and the adjacent pixel opening is less than or equal to the distance between the non-overlapping side of the cathode wiring and the adjacent pixel opening.

9. The display panel according to claim 7, characterized in that: Also includes: A pixel encapsulation layer is disposed on a side of the cathode of the sub-pixel away from the substrate; the pixel encapsulation layer covers the cathode of each sub-pixel; Wherein, on the overlapping side of the cathode wiring, the pixel encapsulation layer overlaps with the top of the cathode wiring; A cathode wiring is arranged between two adjacent columns of sub-pixels, and on the non-overlapping side of the cathode wiring, the pixel encapsulation layer overlaps with the top of the pixel definition layer, or overlaps with the top of the pixel definition layer and the top of the cathode wiring.

10. A method for preparing a display panel, characterized in that: include: providing a substrate; The substrate includes a pixel circuit in each sub-pixel; preparing an anode layer on one side of the substrate; The anode layer includes an anode of each of the sub-pixels; preparing a pixel definition layer on one side of the substrate; The pixel definition layer and the anode layer are arranged on the same side of the substrate; the pixel definition layer defines a plurality of pixel openings surrounded by the pixel definition layer, and each of the sub-pixels is arranged corresponding to each of the pixel openings; A cathode wiring layer is prepared on a side of the pixel definition layer away from the substrate; the cathode wiring layer partially covers the side of the pixel definition layer away from the substrate; the cathode wiring layer includes a plurality of cathode wirings extending along a column direction of the display panel, and at least some of the cathode wirings are insulated from each other; Prepare an isolation structure layer on a side of the cathode wiring layer away from the pixel definition layer; The isolation structure layer includes isolation columns surrounding each of the pixel openings; Based on the isolation function of the isolation column, the light-emitting layer and cathode of each sub-pixel are respectively evaporated in each pixel opening to form each sub-pixel; wherein the cathode of each sub-pixel in the row direction of the display panel is respectively overlapped with different cathode wirings.

11. The method for preparing a display panel according to claim 10, characterized in that: The light emitting layer and the cathode of each sub-pixel are respectively evaporated in each pixel opening, comprising: For any of the sub-pixels: Corresponding to the overlapping area of ​​the sub-pixel, the evaporation angle of the cathode is set to be greater than the evaporation angle of the light-emitting layer; corresponding to the non-overlapping area of ​​the sub-pixel, the evaporation angle of the cathode is set to be less than the evaporation angle of the light-emitting layer; The light-emitting layer and the cathode are evaporated in sequence according to the set evaporation angle, so that in the overlapping area, the cathode of the sub-pixel covers the light-emitting layer of the sub-pixel and partially covers the cathode wiring; in the non-overlapping area, the cathode of the sub-pixel partially covers the light-emitting layer of the sub-pixel, and the cathode of the sub-pixel does not overlap with the cathode wiring.

12. The method for preparing a display panel according to claim 10, characterized in that: A cathode wiring layer is prepared on a side of the pixel definition layer away from the substrate, comprising: Depositing a cathode wiring material on a side of the pixel definition layer away from the substrate to form a cathode wiring material layer; The cathode wiring material layer is patterned to form the cathode wiring layer; wherein, for the cathode wiring that overlaps with the cathode of the sub-pixel on only one side along the row direction, the distance between the overlapping side of the cathode wiring and the adjacent pixel opening is set to be smaller than the distance between the non-overlapping side of the cathode wiring and the adjacent pixel opening.

13. The method for preparing a display panel according to claim 10, characterized in that: The forming of each of the sub-pixels comprises: sequentially forming sub-pixels of different colors; The formation process of any target color sub-pixel includes: Vapor-depositing the light-emitting material of the target color sub-pixel on a side of the anode layer away from the substrate to form a target color light-emitting material layer; Vapor depositing a cathode material of a sub-pixel on a side of the target color light-emitting material layer away from the anode layer to form a cathode material layer; Depositing a first inorganic material on a side of the cathode material layer away from the target color light emitting material layer to form a first inorganic material layer; forming a photoresist on a side of the first inorganic material layer away from the cathode material layer, corresponding to a position of a pixel opening where the target color sub-pixel is located; Removing the first inorganic material, cathode material and light-emitting material except for the portion covered by the photoresist; The photoresist is removed.

14. The method for preparing a display panel according to claim 10, characterized in that: After forming each of the sub-pixels, the method further includes: Prepare a pixel encapsulation layer on a side of each sub-pixel away from the substrate; removing the isolation structure layer; Preparing an organic encapsulation layer on a side of the pixel encapsulation layer away from the substrate; An inorganic encapsulation layer is prepared on a side of the organic encapsulation layer away from the pixel encapsulation layer.

15. A display device, characterized in that: include: The display panel according to any one of claims 1 to 9.

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