Display panel, preparation method thereof and display device

Abstract

The invention relates to a display panel, a preparation method thereof and a display device, and relates to the technical field of display, a heat absorption layer is arranged between a first planarization layer and a cathode auxiliary layer, and the heat absorption layer absorbs heat generated in the process of removing a light-emitting layer on the cathode auxiliary layer by laser, so that the light-emitting layer on the cathode auxiliary layer is removed; therefore, heat generated by the laser is prevented from being absorbed by the cathode auxiliary layer and then transmitted to the first planarization layer, the problem that the cathode auxiliary layer is separated from the first planarization layer due to temperature rise of the first planarization layer is avoided, the display picture is further prevented from being abnormal, and the display effect of the display panel is improved.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode) displays have mature technology in the field of mobile phone displays, but have not yet been popularized in the field of medium and large-sized displays. OLED displays have obvious VSS IR Drop when displayed in large sizes, which seriously affects the brightness uniformity of the screen.

[0003] To solve this problem, after the cathode auxiliary layer is manufactured, the electroluminescent organic layer (EL) on the cathode auxiliary layer is usually removed by laser drilling, and then a cathode electrode connected to the cathode auxiliary layer is manufactured.

[0004] However, the display effect of the screen is still not ideal. Summary of the invention

[0005] Based on this, it is necessary to provide a display panel and a preparation method thereof, and a display device that can improve the display effect of the screen in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a display panel, comprising:

[0007] substrate;

[0008] A first planarization layer is disposed on one side of the substrate;

[0009] A heat absorbing layer, disposed on a side of the first planarization layer away from the substrate;

[0010] The cathode auxiliary layer is disposed on a side of the heat absorbing layer away from the first planarizing layer, and the cathode auxiliary layer is separated from the first planarizing layer by the heat absorbing layer.

[0011] The above-mentioned display panel arranges a heat absorption layer between the first planarization layer and the cathode auxiliary layer. The heat absorption layer absorbs the heat generated in the process of laser removing the light-emitting layer on the cathode auxiliary layer, thereby preventing the heat generated by the laser from being absorbed by the cathode auxiliary layer and then transferred to the first planarization layer, and avoiding the problem of the cathode auxiliary layer and the first planarization layer being separated due to the temperature increase of the first planarization layer, thereby avoiding abnormal display images and improving the display effect of the display panel.

[0012] In one embodiment, the material of the heat absorbing layer includes a heat absorbing material;

[0013] Preferably, the material of the heat absorbing layer includes amorphous silicon;

[0014] Preferably, the thickness of the heat absorbing layer is 500A-2000A.

[0015] In this way, the heat generated by the laser is absorbed by the heat absorbing material of the heat absorbing layer, thereby preventing the heat from being transferred to the first planarization layer, and preventing the temperature of the first planarization layer from rising and causing the cathode auxiliary layer to separate from the first planarization layer.

[0016] In one embodiment, it also includes:

[0017] an anode layer, disposed on a side of the first planarization layer away from the substrate, the anode layer and the cathode auxiliary layer being disposed in the same layer, and the anode layer and the cathode auxiliary layer being insulated;

[0018] A pixel definition layer is provided on a side of the cathode auxiliary layer and the anode layer away from the first planarization layer, and the pixel definition layer is provided with a plurality of first openings, and the first openings are provided corresponding to the cathode auxiliary layer;

[0019] A light-emitting layer, disposed on a side of the pixel definition layer away from the anode layer;

[0020] A cathode layer is at least partially disposed in the first opening and is in contact with and connected to the cathode auxiliary layer.

[0021] In this way, for the display panel in which the anode layer and the cathode auxiliary layer are arranged on the same layer, the heat absorption layer absorbs the heat generated in the process of laser removing the light-emitting layer on the cathode auxiliary layer, thereby avoiding the problem of the cathode auxiliary layer and the first planarization layer being separated due to the temperature increase of the first planarization layer, avoiding abnormal display images, and improving the display effect of the display panel.

[0022] In one embodiment, the display panel further includes:

[0023] The second planarization layer is arranged on a side of the cathode auxiliary layer away from the heat absorption layer. The second planarization layer has a through hole, and the through hole is arranged corresponding to the cathode auxiliary layer.

[0024] In this way, for the display panel in which the anode layer is arranged on the upper layer of the cathode auxiliary layer, the heat absorption layer absorbs the heat generated in the process of laser removing the light-emitting layer on the cathode auxiliary layer, thereby avoiding the problem of the cathode auxiliary layer and the first planarization layer being separated due to the temperature increase of the first planarization layer, avoiding abnormal display images, and improving the display effect of the display panel.

[0025] In one embodiment, the display panel further includes:

[0026] A pixel definition layer is provided on a side of the second planarization layer away from the cathode auxiliary layer, the pixel definition layer is provided with a plurality of first openings, the first openings are provided corresponding to the through holes and are connected to the through holes;

[0027] A cathode layer, at least partially disposed in the first opening and in contact with and connected to the cathode auxiliary layer;

[0028] an anode layer, disposed on a side of the pixel definition layer away from the second planarization layer;

[0029] A light-emitting layer, disposed on a side of the anode layer away from the pixel definition layer;

[0030] Preferably, the cathode auxiliary layer comprises a first cathode auxiliary layer and a second cathode auxiliary layer, the first cathode auxiliary layer is arranged on a side of the heat absorbing layer away from the first planarization layer, the second cathode auxiliary layer is arranged in the connected first opening and the through hole and connected to the first cathode auxiliary layer, and the cathode layer is in contact with and connected to the second cathode auxiliary layer;

[0031] The second cathode auxiliary layer is disposed on the same layer as the anode layer, and the anode layer is insulated from the second cathode auxiliary layer.

[0032] In this way, the cathode auxiliary layer includes a first cathode auxiliary layer and a second cathode auxiliary layer stacked in sequence. The cathode auxiliary layer can further increase the impedance of the cathode layer, which is beneficial to improving the display effect of the display panel.

[0033] In a second aspect, the present disclosure provides a method for preparing a display panel, comprising:

[0034] providing a substrate;

[0035] forming a first planarization layer on one side of the substrate;

[0036] forming a heat absorbing layer on a side of the first planarization layer away from the substrate;

[0037] A cathode auxiliary layer is formed on a side of the heat absorbing layer away from the first planarizing layer, and the cathode auxiliary layer is separated from the first planarizing layer by the heat absorbing layer.

[0038] The preparation method of the above-mentioned display panel sets a heat absorption layer between the first planarization layer and the cathode auxiliary layer. The heat absorption layer absorbs the heat generated in the process of laser removing the light-emitting layer on the cathode auxiliary layer, thereby preventing the heat generated by the laser from being absorbed by the cathode auxiliary layer and then transferred to the first planarization layer, and avoiding the problem of the cathode auxiliary layer and the first planarization layer being separated due to the temperature increase of the first planarization layer, thereby avoiding abnormal display images and improving the display effect of the display panel.

[0039] In one embodiment, the material of the heat absorbing layer includes a heat absorbing material;

[0040] Preferably, the material of the heat absorbing layer includes amorphous silicon;

[0041] Preferably, the thickness of the heat absorbing layer is 500A-2000A.

[0042] In this way, the heat generated by the laser is absorbed by the heat absorbing material of the heat absorbing layer, thereby preventing the heat from being transferred to the first planarization layer, and preventing the temperature of the first planarization layer from rising and causing the cathode auxiliary layer to separate from the first planarization layer.

[0043] In one embodiment, while forming a cathode auxiliary layer on a side of the heat absorbing layer away from the first planarization layer, an anode layer is formed, the anode layer is arranged on a side of the first planarization layer away from the substrate, the anode layer and the cathode auxiliary layer are arranged in the same layer, and the anode layer and the cathode auxiliary layer are insulated;

[0044] Preferably, after forming the cathode auxiliary layer and the anode layer, the preparation method further comprises:

[0045] forming a pixel definition layer on a side of the cathode auxiliary layer and the anode layer away from the first planarization layer, wherein the pixel definition layer is provided with a plurality of first openings, and the first openings are provided corresponding to the cathode auxiliary layer;

[0046] forming a light-emitting layer to cover the pixel definition layer;

[0047] Using laser to remove the light emitting layer in the first opening, and the heat absorbing layer absorbing heat generated in the process of removing the light emitting layer by laser;

[0048] A cathode layer is formed in the first opening, and the cathode layer is in contact with and connected to the cathode auxiliary layer.

[0049] In this way, for the display panel in which the anode layer and the cathode auxiliary layer are arranged on the same layer, the heat absorption layer absorbs the heat generated in the process of laser removing the light-emitting layer on the cathode auxiliary layer, thereby avoiding the problem of the cathode auxiliary layer and the first planarization layer being separated due to the temperature increase of the first planarization layer, avoiding abnormal display images, and improving the display effect of the display panel.

[0050] In one embodiment, after forming the cathode auxiliary layer, the method further comprises:

[0051] forming a second planarization layer on a side of the cathode auxiliary layer away from the heat absorption layer, wherein the second planarization layer has a through hole, and the through hole is arranged corresponding to the cathode auxiliary layer;

[0052] Preferably, after forming the second planarization layer, the method further comprises:

[0053] forming a pixel definition layer on a side of the second planarization layer away from the cathode auxiliary layer, wherein the pixel definition layer is provided with a plurality of first openings, and the first openings are arranged corresponding to the through holes and communicated with the through holes;

[0054] forming an anode layer on a side of the pixel definition layer away from the second planarization layer;

[0055] forming a light-emitting layer on a side of the anode layer away from the pixel definition layer;

[0056] The light emitting layer in the first opening and the through hole is removed by laser, and the heat absorbing layer absorbs the heat generated in the process of removing the light emitting layer by laser;

[0057] Preferably, after removing the light emitting layer in the first opening by laser, the method further comprises:

[0058] forming a cathode layer, wherein the cathode layer fills the first opening and the through hole, and the cathode layer is in contact with and connected to the cathode auxiliary layer;

[0059] Preferably, while forming the anode layer, a second cathode auxiliary layer is formed in the connected first opening and the through hole, and the second cathode auxiliary layer covers the cathode auxiliary layer exposed by the through hole;

[0060] The cathode layer is in contact with and connected to the second cathode auxiliary layer.

[0061] In this way, on the one hand, for the display panel in which the anode layer is arranged on the upper layer of the cathode auxiliary layer, the heat absorption layer absorbs the heat generated in the process of laser removing the light-emitting layer on the cathode auxiliary layer, thereby avoiding the problem of the cathode auxiliary layer and the first planarization layer being separated due to the temperature increase of the first planarization layer, avoiding abnormal display images, and improving the display effect of the display panel; on the other hand, the cathode auxiliary layer includes a first cathode auxiliary layer and a second cathode auxiliary layer stacked in sequence, and the cathode auxiliary layer can further increase the impedance of the cathode layer, which is beneficial to improving the display effect of the display panel.

[0062] In a third aspect, the present disclosure provides a display device, comprising the display panel as described in the first aspect, or a display panel manufactured by the method for manufacturing a display panel as described in the second aspect.

[0063] The above-mentioned display device arranges a heat absorption layer between the first planarization layer and the cathode auxiliary layer. The heat absorption layer absorbs the heat generated in the process of laser removing the light-emitting layer on the cathode auxiliary layer, thereby preventing the heat generated by the laser from being absorbed by the cathode auxiliary layer and then transferred to the first planarization layer, and avoiding the problem of the cathode auxiliary layer and the first planarization layer being separated due to the temperature increase of the first planarization layer, thereby avoiding abnormal display images and improving the display effect of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. 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 in one embodiment of the present application;

[0066] Figure 2 A schematic diagram of the structure of a display panel provided in one embodiment of the present application;

[0067] Figure 3 A schematic diagram of a process for preparing a display panel provided in one embodiment of the present application;

[0068] Figure 4 A schematic diagram of a process for preparing a display panel provided in another embodiment of the present application;

[0069] Figure 5 A schematic diagram of another embodiment of the present application after forming a first planarization layer, a heat absorption layer, a cathode auxiliary layer, a pixel definition layer and a light emitting layer on a substrate;

[0070] Figure 6 This is a schematic diagram of another embodiment of the present application after the light emitting layer in the first opening is removed;

[0071] Figure 7 A schematic diagram of a process for preparing a display panel provided in one embodiment of the present application.

[0072] Figure 8 A schematic diagram of another embodiment of the present application after forming a first planarization layer, a heat absorption layer, a cathode auxiliary layer, a second planarization layer, a pixel definition layer, an anode layer and a light emitting layer on a substrate;

[0073] Fig. 9 This is a schematic diagram of another embodiment of the present application after the light-emitting layer in the first opening and the through hole is removed.

[0074] Description of reference numerals:

[0075] 11. Substrate; 12. First planarization layer; 13. Heat absorption layer; 14. Cathode auxiliary layer; 114. First cathode auxiliary layer; 214. Second cathode auxiliary layer; 141. First conductive layer; 142. Second conductive layer; 143. Third conductive layer; 15. Pixel definition layer; 151. First opening; 16. Light emitting layer; 17. Second planarization layer; 171. Through hole; 18. Cathode layer. DETAILED DESCRIPTION

[0076] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0077] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0078] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0079] As described in the background technology, in the prior art, after the cathode auxiliary layer is manufactured, the electroluminescent organic layer (EL) on the cathode auxiliary layer is removed by laser drilling. However, after the heat generated by the laser removal of the electroluminescent organic layer on the cathode auxiliary layer is absorbed by the cathode auxiliary layer, the heat is transferred to the planarization layer through the cathode auxiliary layer, and the temperature of the planarization layer increases. The cathode auxiliary layer may fall off from the planarization layer, causing abnormal display images and affecting the display effect.

[0080] Based on the above reasons, the present invention provides a display panel and a preparation method thereof, and a display device. A heat absorption layer is arranged between the first planarization layer and the cathode auxiliary layer. The heat absorption layer absorbs the heat generated in the process of laser removing the light-emitting layer, thereby preventing the heat generated by the laser from being absorbed by the cathode auxiliary layer and then transferred to the first planarization layer, thereby preventing the temperature increase of the first planarization layer from causing the cathode auxiliary layer to separate from the first planarization layer, thereby avoiding abnormal display images and improving the display effect of the display panel.

[0081] In a first aspect, the present application provides a display panel, such as Figure 1 or Figure 2 As shown, the display panel includes a substrate 11, a first planarization layer 12, a heat absorbing layer 13 and a cathode auxiliary layer 14; the first planarization layer 12 is arranged on one side of the substrate 11; the heat absorbing layer 13 is arranged on the side of the first planarization layer 12 away from the substrate 11; the cathode auxiliary layer 14 is arranged on the side of the heat absorbing layer 13 away from the first planarization layer 12, and the cathode auxiliary layer 14 is separated from the first planarization layer 12 by the heat absorbing layer 13.

[0082] The substrate 11 may be flexible polyimide (PI), rigid glass or thin metal sheet, etc. The present application embodiment will not discuss other materials of the substrate 11 in detail, and those skilled in the art may select different types of materials according to actual needs.

[0083] The first planarization layer 12 may include a single layer or multiple layers of organic material. For example, the first planarization layer 12 may include polyimide.

[0084] The heat absorbing layer 13 is used to absorb the heat of the cathode auxiliary layer 14 to prevent the heat of the cathode auxiliary layer 14 from being transferred to the first planarization layer 12 .

[0085] The cathode auxiliary layer 14 may include a single layer or multiple layers of conductive layers.

[0086] The above-mentioned display panel arranges a heat absorbing layer 13 between the first planarization layer 12 and the cathode auxiliary layer 14. The heat absorbing layer 13 absorbs the heat generated in the process of laser removing the light-emitting layer, thereby preventing the heat generated by the laser from being absorbed by the cathode auxiliary layer 14 and then transferred to the first planarization layer 12, thereby preventing the temperature increase of the first planarization layer 12 causing the cathode auxiliary layer 14 to separate from the first planarization layer 12, thereby avoiding abnormal display images and improving the display effect of the display panel.

[0087] In one embodiment, if Figure 1 or Figure 2 As shown, the material of the heat absorbing layer 13 includes a heat absorbing material; thus, the heat generated by the laser is absorbed by the heat absorbing material of the heat absorbing layer 13, thereby preventing the heat from being transferred to the first planarization layer 12, and preventing the temperature of the first planarization layer 12 from rising and causing the cathode auxiliary layer 14 to separate from the first planarization layer 12.

[0088] In one example, the material of the heat absorbing layer 13 includes amorphous silicon.

[0089] In one embodiment, if Figure 1 or Figure 2As shown, the thickness of the heat absorbing layer 13 is 500A-2000A. For example, the thickness of the heat absorbing layer 13 can be 500A, 800A, 1000A, 1200A, 1500A, 1800A or 2000A. In this way, the thickness of the heat absorbing layer 13 is sufficient to prevent the heat generated by the laser from being transferred to the first planarization layer 12, thereby preventing the temperature of the first planarization layer 12 from rising.

[0090] In one embodiment, if Figure 1 As shown, the display panel also includes an anode layer (not shown in the figure), a pixel definition layer 15, a light-emitting layer (not shown in the figure) and a cathode layer 18. The anode layer is arranged on the side of the first planarization layer 12 away from the substrate 11, and the anode layer and the cathode auxiliary layer 14 are arranged in the same layer, and the anode layer and the cathode auxiliary layer 14 are insulated; the pixel definition layer 15 is arranged on the side of the cathode auxiliary layer 14 and the anode layer away from the first planarization layer 12, and the pixel definition layer 15 is provided with a plurality of first openings 151, and the first openings 151 are arranged corresponding to the cathode auxiliary layer 14; the light-emitting layer is arranged on the side of the pixel definition layer 15 away from the anode layer; the cathode layer 18 is arranged in the first opening 151 and is in contact with and connected to the cathode auxiliary layer 14.

[0091] The cathode auxiliary layer 14 and the anode layer are formed in the same deposition process. The cathode auxiliary layer 14 includes a first conductive layer 141, a second conductive layer 142 and a third conductive layer 143 stacked in sequence. The first conductive layer 141 and the third conductive layer 143 are light-transmitting layers, and the second conductive layer 142 is an opaque metal layer.

[0092] In this embodiment, the cathode auxiliary layer 14 includes an indium tin oxide layer, a metal silver layer and an indium tin oxide layer stacked in sequence.

[0093] In this way, for the display panel in which the anode layer and the cathode auxiliary layer 14 are arranged on the same layer, the heat absorption layer 13 absorbs the heat generated in the process of laser removal of the light-emitting layer, thereby avoiding the problem of the cathode auxiliary layer 14 being separated from the first planarization layer 12 due to the increase in temperature of the first planarization layer 12, avoiding abnormal display images, and improving the display effect of the display panel.

[0094] In one embodiment, if Figure 2 As shown, the display panel further includes a second planarization layer 17, which is disposed on a side of the cathode auxiliary layer 14 away from the heat absorption layer 13, and has a through hole 171, which is disposed corresponding to the cathode auxiliary layer 14. In this way, for a display panel in which the anode layer is disposed on the cathode auxiliary layer 14, the heat absorption layer 13 absorbs the heat generated in the process of laser removal of the light-emitting layer, thereby avoiding the problem of the cathode auxiliary layer 14 and the first planarization layer 12 being separated due to the temperature rise of the first planarization layer 12, avoiding abnormal display images, and improving the display effect of the display panel.

[0095] In one embodiment, if Figure 2 As shown, the display panel also includes a pixel definition layer 15, a cathode layer 18, an anode layer (not shown in the figure) and a light-emitting layer (not shown in the figure); the pixel definition layer 15 is arranged on the side of the second planarization layer 17 away from the cathode auxiliary layer 14, and the pixel definition layer 15 is provided with a plurality of first openings 151, and the first openings 151 are arranged corresponding to the through holes 171 and are connected to the through holes 171; the cathode layer 18 is at least partially arranged in the first openings 151 and is in contact with and connected to the cathode auxiliary layer 14; the anode layer is arranged on the side of the pixel definition layer 15 away from the second planarization layer 17; and the light-emitting layer is arranged on the side of the anode layer away from the pixel definition layer 15.

[0096] In this embodiment, the cathode auxiliary layer 14 includes a first cathode auxiliary layer 114 and a second cathode auxiliary layer 214. The first cathode auxiliary layer 114 is arranged on the side of the heat absorption layer 13 away from the first planarization layer 12, and the second cathode auxiliary layer 214 is arranged in the connected first opening 151 and the through hole 171 and is connected to the first cathode auxiliary layer 114. The cathode layer 18 is in contact and connected with the second cathode auxiliary layer 214; the second cathode auxiliary layer 214 is arranged on the same layer as the anode layer, and the anode layer and the second cathode auxiliary layer 214 are insulated.

[0097] The first cathode auxiliary layer 114 includes a first conductive layer 141, a second conductive layer 142, and a third conductive layer 143 stacked in sequence. In one example, the first cathode auxiliary layer 114 includes a metal titanium layer, a metal aluminum layer, and a metal titanium layer stacked in sequence. In this way, the cathode auxiliary layer 114 includes a first cathode auxiliary layer 114 and a second cathode auxiliary layer 214 stacked in sequence, and the cathode auxiliary layer 14 can further improve the impedance of the cathode layer 18, which is beneficial to improving the display effect of the display panel.

[0098] Based on the same inventive concept, Figure 3 As shown, an embodiment of the present application provides a method for preparing a display panel, comprising:

[0099] Step S11: providing a substrate 11;

[0100] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 , Fig. 9 The substrate 11 may be flexible polyimide (PI), rigid glass or thin metal sheet, etc. The present application embodiment will not discuss other materials of the substrate 11 in detail, and those skilled in the art may select different types of materials according to actual needs.

[0101] Step S12: forming a first planarization layer 12 on one side of the substrate 11;

[0102] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 , Fig. 9 The first planarization layer 12 may be formed by deposition using a chemical vapor deposition (CVD) process. The first planarization layer 12 may include a single layer or multiple layers of an organic material. For example, the first planarization layer 12 may include polyimide.

[0103] Step S13: forming a heat absorbing layer 13 on a side of the first planarization layer 12 away from the substrate 11; and depositing the heat absorbing layer 13 using a chemical vapor deposition process.

[0104] In one embodiment, referring to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 , Fig. 9 The material of the heat absorbing layer 13 includes a heat absorbing material; thus, the heat generated by the laser is absorbed by the heat absorbing material of the heat absorbing layer 13, thereby preventing the heat from being transferred to the first planarization layer 12, and preventing the temperature of the first planarization layer 12 from rising and causing the cathode auxiliary layer 14 to separate from the first planarization layer 12.

[0105] In one embodiment, the material of the heat absorbing layer 13 includes amorphous silicon.

[0106] In one embodiment, the thickness of the heat absorbing layer 13 is 500A-2000A. For example, the thickness of the heat absorbing layer 13 may be 500A, 800A, 1000A, 1200A, 1500A, 1800A or 2000A. In this way, the thickness of the heat absorbing layer 13 is sufficient to prevent the heat generated by the laser from being transferred to the first planarization layer 12, thereby preventing the temperature of the first planarization layer 12 from rising.

[0107] Step S14 : forming a cathode auxiliary layer 14 on a side of the heat absorbing layer 13 away from the first planarizing layer 12 , wherein the cathode auxiliary layer 14 is separated from the first planarizing layer 12 by the heat absorbing layer 13 .

[0108] The cathode auxiliary layer 14 may be formed by deposition using a physical vapor deposition (PVD) process, and the cathode auxiliary layer 14 may include a single-layer or multi-layer conductive layer.

[0109] The preparation method of the above-mentioned display panel is to set a heat absorption layer 13 between the first planarization layer 12 and the cathode auxiliary layer 14. The heat absorption layer 13 absorbs the heat generated in the process of laser removing the light-emitting layer 16, thereby preventing the heat generated by the laser from being absorbed by the cathode auxiliary layer 14 and then transferred to the first planarization layer 12, thereby preventing the temperature increase of the first planarization layer 12 causing the cathode auxiliary layer 14 to separate from the first planarization layer 12, thereby avoiding abnormal display images and improving the display effect of the display panel.

[0110] In one embodiment, if Figure 4 As shown, an embodiment of the present application provides a method for preparing a display panel, comprising:

[0111] Step S21: providing a substrate 11;

[0112] Step S22: forming a first planarization layer 12 on one side of the substrate 11;

[0113] Step S23: forming a heat absorbing layer 13 on a side of the first planarization layer 12 away from the substrate 11;

[0114] Step S24: forming a cathode auxiliary layer 14 on a side of the heat absorbing layer 13 away from the first planarizing layer 12, and forming an anode layer at the same time, wherein the cathode auxiliary layer 14 is separated from the first planarizing layer 12 by the heat absorbing layer 13, and the anode layer is disposed on a side of the first planarizing layer 12 away from the substrate 11, and the anode layer and the cathode auxiliary layer 14 are disposed on the same layer, and the anode layer and the cathode auxiliary layer 14 are insulated;

[0115] Reference Figure 5 An insulating layer is deposited on the first planarization layer 12, and then the insulating layer is patterned to form a patterned via hole. Then, a conductive material is deposited into the patterned via hole to form an insulated first planarization layer 12 and an anode layer.

[0116] In one embodiment, referring to Figure 5 The cathode auxiliary layer 14 includes a first conductive layer 141, a second conductive layer 142 and a third conductive layer 143 stacked in sequence. The first conductive layer 141 and the third conductive layer 143 are light-transmitting layers, and the second conductive layer 142 is an opaque metal layer.

[0117] In this embodiment, the cathode auxiliary layer 14 includes an indium tin oxide layer, a metal silver layer and an indium tin oxide layer stacked in sequence.

[0118] Step S25: forming a pixel definition layer 15 on the side of the cathode auxiliary layer 14 and the anode layer away from the first planarization layer 12, wherein the pixel definition layer 15 is provided with a plurality of first openings 151, and the first openings 151 are provided corresponding to the cathode auxiliary layer 14;

[0119] Reference Figure 5The pixel definition layer 15 may be formed by CVD deposition, and then the pixel definition layer 15 may be patterned to form a first opening 151 , wherein the first opening 151 exposes a portion of the cathode auxiliary layer 14 .

[0120] Step S26: forming a light emitting layer 16 to cover the pixel definition layer 15;

[0121] Reference Figure 5 The light emitting layer 16 may be formed by evaporation process, and the light emitting layer 16 covers the pixel definition layer 15 and the exposed cathode auxiliary layer 14. The light emitting layer 16 includes a light emitting organic material.

[0122] Step S27: removing the light emitting layer 16 in the first opening 151 by laser, and the heat absorbing layer 13 absorbs the heat generated in the process of removing the light emitting layer 16 by laser;

[0123] Reference Figure 6 The laser irradiates the first opening 151, ablates and removes the light emitting layer 16 in the first opening 151, and exposes the cathode auxiliary layer 14 in the first opening 151. The heat of the light emitting layer 16 irradiated by the laser is absorbed by the cathode auxiliary layer 14 and then transferred to the heat absorbing layer 13. The heat absorbing layer 13 absorbs the heat to prevent the heat from being transferred to the first planarization layer 12, thereby preventing the temperature of the first planarization layer 12 from rising.

[0124] Step S28 : forming a cathode layer 18 in the first opening 151 , wherein the cathode layer 18 is in contact with and connected to the cathode auxiliary layer 14 .

[0125] Reference Figure 1 The cathode layer 18 may be formed by deposition using a physical vapor deposition (PVD) process. The cathode layer 18 may include a single layer or multiple layers of conductive layers.

[0126] In this way, for the display panel in which the anode layer and the cathode auxiliary layer 14 are arranged on the same layer, the heat absorption layer 13 absorbs the heat generated in the process of laser removing the light-emitting layer 16, thereby avoiding the problem of the cathode auxiliary layer 14 being separated from the first planarization layer 12 due to the increase in temperature of the first planarization layer 12, avoiding abnormal display images, and improving the display effect of the display panel.

[0127] In one embodiment, if Figure 7 As shown, an embodiment of the present application provides a method for preparing a display panel, comprising:

[0128] Step S31: providing a substrate 11;

[0129] Step S32: forming a first planarization layer 12 on one side of the substrate 11;

[0130] Step S33: forming a heat absorbing layer 13 on a side of the first planarization layer 12 away from the substrate 11;

[0131] Step S34: forming a cathode auxiliary layer 14 on a side of the heat absorbing layer 13 away from the first planarizing layer 12, wherein the cathode auxiliary layer 14 is separated from the first planarizing layer 12 by the heat absorbing layer 13;

[0132] Step S35: forming a second planarization layer 17 on a side of the cathode auxiliary layer 14 away from the heat absorption layer 13, wherein the second planarization layer 17 has a through hole 171, and the through hole 171 is arranged corresponding to the cathode auxiliary layer 14;

[0133] Reference Figure 8 The second planarization layer 17 may be formed by deposition using a chemical vapor deposition (CVD) process. The second planarization layer 17 may include a single layer or multiple layers of an organic material. For example, the second planarization layer 17 may include polyimide.

[0134] Then, the second planarization layer 17 is patterned to form a through hole 171 , and the through hole 171 is arranged corresponding to the cathode auxiliary layer 14 .

[0135] Step S36: forming a pixel definition layer 15 on a side of the second planarization layer 17 away from the cathode auxiliary layer 14, wherein the pixel definition layer 15 is provided with a plurality of first openings 151, and the first openings 151 are provided corresponding to the through holes 171 and communicate with the through holes 171;

[0136] Step S37: forming an anode layer on a side of the pixel definition layer 15 away from the second planarization layer 17;

[0137] Step S38: forming a light emitting layer 16 on a side of the anode layer away from the pixel definition layer 15;

[0138] Step S39: removing the light emitting layer 16 in the first opening 151 and the through hole 171 by laser, and the heat absorbing layer 13 absorbs the heat generated in the process of removing the light emitting layer 16 by laser;

[0139] Reference Fig. 9 The light emitting layer 16 in the first opening 151 and the through hole 171 is removed by laser irradiation, exposing the cathode auxiliary layer 14 under the through hole 171. The heat of the light emitting layer 16 irradiated by the laser is absorbed by the cathode auxiliary layer 14 and then transferred to the heat absorbing layer 13. The heat absorbing layer 13 absorbs the heat to prevent the heat from being transferred to the first planarization layer 12, thereby preventing the temperature of the first planarization layer 12 from rising.

[0140] Step S40 : forming a cathode layer 18 , wherein the cathode layer 18 fills the first opening 151 and the through hole 171 , and the cathode layer 18 is in contact with and connected to the cathode auxiliary layer 14 .

[0141] Reference Figure 2 The cathode layer 18 may be formed by deposition using a physical vapor deposition (PVD) process. The cathode layer 18 may include a single layer or multiple layers of conductive layers.

[0142] In this embodiment, refer to Fig. 9 , while forming the anode layer (not shown in the figure), a second cathode auxiliary layer 214 is formed in the connected first opening 151 and the through hole 171, and the second cathode auxiliary layer 214 covers the cathode auxiliary layer 14 exposed by the through hole 171; the cathode layer 18 is in contact with and connected to the second cathode auxiliary layer 214. In this way, step S34 deposits and forms the first cathode auxiliary layer 114 on the heat absorbing layer 13, and the final cathode auxiliary layer 14 includes the first cathode auxiliary layer 114 and the second cathode auxiliary layer 214 stacked.

[0143] During the deposition process of forming the anode layer, a conductive material is deposited into the first opening 151 and the through hole 171 to form the second cathode auxiliary layer 214 . The conductive material is patterned and etched to disconnect the anode layer and the second cathode auxiliary layer 214 . The anode layer and the second cathode auxiliary layer 214 are insulated from each other.

[0144] The first cathode auxiliary layer 114 includes a first conductive layer 141, a second conductive layer 142, and a third conductive layer 143 stacked in sequence. In one example, the first cathode auxiliary layer 114 includes a metal titanium layer, a metal aluminum layer, and a metal titanium layer stacked in sequence.

[0145] In this way, on the one hand, for the display panel in which the anode layer is arranged on the upper layer of the cathode auxiliary layer 14, the heat absorption layer 13 absorbs the heat generated in the process of laser removal of the light-emitting layer 16, thereby avoiding the problem that the temperature increase of the first planarization layer 12 causes the cathode auxiliary layer 14 to separate from the first planarization layer 12, avoiding abnormal display images, and improving the display effect of the display panel; on the other hand, the cathode auxiliary layer 14 includes a first cathode auxiliary layer 114 and a second cathode auxiliary layer 214 stacked in sequence, and the cathode auxiliary layer 14 can further increase the impedance of the cathode layer 18, which is beneficial to improving the display effect of the display panel.

[0146] Based on the same inventive concept, an embodiment of the present application further provides a display device (not shown), which includes the display panel in the above embodiment, or includes a display panel manufactured by the method for manufacturing the display panel in the above embodiment.

[0147] It can be understood that the display device in the embodiments of the present application can be an OLED display device, a QLED display device, electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, a wearable device, an Internet of Things device, or any other product or component with a display function, and the embodiments disclosed in the present application are not limited to this.

[0148] The above-mentioned display device arranges a heat absorption layer between the first planarization layer and the cathode auxiliary layer. The heat absorption layer absorbs the heat generated in the process of laser removing the light-emitting layer, thereby preventing the heat generated by the laser from being absorbed by the cathode auxiliary layer and then transferred to the first planarization layer, thereby preventing the temperature increase of the first planarization layer from causing the cathode auxiliary layer to separate from the first planarization layer, thereby avoiding abnormal display images and improving the display effect of the display device.

[0149] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0150] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A display panel, characterized in that: include: substrate; A first planarization layer is disposed on one side of the substrate; A heat absorbing layer, disposed on a side of the first planarization layer away from the substrate; The cathode auxiliary layer is disposed on a side of the heat absorbing layer away from the first planarizing layer, and the cathode auxiliary layer is separated from the first planarizing layer by the heat absorbing layer.

2. The display panel according to claim 1, characterized in that: The material of the heat absorbing layer includes a heat absorbing material; Preferably, the material of the heat absorbing layer includes amorphous silicon; Preferably, the thickness of the heat absorbing layer is 500A-2000A.

3. The display panel according to claim 1 or 2, characterized in that: Also includes: an anode layer, disposed on a side of the first planarization layer away from the substrate, the anode layer and the cathode auxiliary layer being disposed in the same layer, and the anode layer and the cathode auxiliary layer being insulated; A pixel definition layer is provided on a side of the cathode auxiliary layer and the anode layer away from the first planarization layer, and the pixel definition layer is provided with a plurality of first openings, and the first openings are provided corresponding to the cathode auxiliary layer; A light-emitting layer, disposed on a side of the pixel definition layer away from the anode layer; A cathode layer is at least partially disposed in the first opening and is in contact with and connected to the cathode auxiliary layer.

4. The display panel according to claim 1 or 2, characterized in that: The display panel further includes: The second planarization layer is arranged on a side of the cathode auxiliary layer away from the heat absorption layer. The second planarization layer has a through hole, and the through hole is arranged corresponding to the cathode auxiliary layer.

5. The display panel according to claim 4, characterized in that: The display panel further includes: A pixel definition layer is provided on a side of the second planarization layer away from the cathode auxiliary layer, the pixel definition layer is provided with a plurality of first openings, the first openings are provided corresponding to the through holes and are connected to the through holes; A cathode layer, at least partially disposed in the first opening and in contact with and connected to the cathode auxiliary layer; an anode layer, disposed on a side of the pixel definition layer away from the second planarization layer; A light-emitting layer, disposed on a side of the anode layer away from the pixel definition layer; Preferably, the cathode auxiliary layer comprises a first cathode auxiliary layer and a second cathode auxiliary layer, the first cathode auxiliary layer is arranged on a side of the heat absorbing layer away from the first planarization layer, the second cathode auxiliary layer is arranged in the connected first opening and the through hole and connected to the first cathode auxiliary layer, and the cathode layer is in contact with and connected to the second cathode auxiliary layer; The second cathode auxiliary layer is disposed on the same layer as the anode layer, and the anode layer is insulated from the second cathode auxiliary layer.

6. A method for preparing a display panel, characterized in that: include: providing a substrate; forming a first planarization layer on one side of the substrate; forming a heat absorbing layer on a side of the first planarization layer away from the substrate; A cathode auxiliary layer is formed on a side of the heat absorbing layer away from the first planarizing layer, and the cathode auxiliary layer is separated from the first planarizing layer by the heat absorbing layer.

7. The method for preparing a display panel according to claim 6, characterized in that: The material of the heat absorbing layer includes a heat absorbing material; Preferably, the material of the heat absorbing layer includes amorphous silicon; Preferably, the thickness of the heat absorbing layer is 500A-2000A.

8. The method for preparing a display panel according to claim 6 or 7, characterized in that: While forming a cathode auxiliary layer on a side of the heat absorbing layer away from the first planarization layer, an anode layer is formed, wherein the anode layer is disposed on a side of the first planarization layer away from the substrate, the anode layer and the cathode auxiliary layer are disposed in the same layer, and the anode layer and the cathode auxiliary layer are insulated; Preferably, after forming the cathode auxiliary layer and the anode layer, the preparation method further comprises: forming a pixel definition layer on a side of the cathode auxiliary layer and the anode layer away from the first planarization layer, wherein the pixel definition layer is provided with a plurality of first openings, and the first openings are provided corresponding to the cathode auxiliary layer; forming a light-emitting layer to cover the pixel definition layer; Using laser to remove the light emitting layer in the first opening, and the heat absorbing layer absorbing heat generated in the process of removing the light emitting layer by laser; A cathode layer is formed in the first opening, and the cathode layer is in contact with and connected to the cathode auxiliary layer.

9. The method for preparing a display panel according to claim 6 or 7, characterized in that: After forming the cathode auxiliary layer, the method further includes: forming a second planarization layer on a side of the cathode auxiliary layer away from the heat absorption layer, wherein the second planarization layer has a through hole, and the through hole is arranged corresponding to the cathode auxiliary layer; Preferably, after forming the second planarization layer, the method further comprises: forming a pixel definition layer on a side of the second planarization layer away from the cathode auxiliary layer, wherein the pixel definition layer is provided with a plurality of first openings, and the first openings are arranged corresponding to the through holes and communicated with the through holes; forming an anode layer on a side of the pixel definition layer away from the second planarization layer; forming a light-emitting layer on a side of the anode layer away from the pixel definition layer; The light emitting layer in the first opening and the through hole is removed by laser, and the heat absorbing layer absorbs the heat generated in the process of removing the light emitting layer by laser; Preferably, after removing the light emitting layer in the first opening by laser, the method further comprises: forming a cathode layer, wherein the cathode layer fills the first opening and the through hole, and the cathode layer is in contact with and connected to the cathode auxiliary layer; Preferably, while forming the anode layer, a second cathode auxiliary layer is formed in the connected first opening and the through hole, and the second cathode auxiliary layer covers the cathode auxiliary layer exposed by the through hole; The cathode layer is in contact with and connected to the second cathode auxiliary layer.

10. A display device, characterized in that: A display panel comprising the display panel as described in any one of claims 1-5, or a display panel manufactured by the method for manufacturing a display panel as described in any one of claims 6-9.

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