OLED display panel and terminal device

Abstract

Disclosed in the embodiments of the present application are an OLED display panel and a terminal device. The OLED display panel comprises a first undercut structure, which is located between adjacent anodes, wherein a filling-in portion at least covers one end of the first undercut structure, and the filling-in portion is obliquely arranged; and a cathode is separated from a charge generation layer in an insulating manner by means of a light-emitting layer continuously provided at the filling-in portion, thereby avoiding a short circuit between the charge generation layer and the cathode caused by the disconnection of the light-emitting layer at the edge of the first undercut structure.

Description

OLED display panels, terminal equipment Technical Field

[0001] The present application relates to the field of display technology, and in particular to an OLED display panel and a terminal device. Background Art

[0002] Since the stacked device contains a charge generation layer, the step coverage of the charge generation layer is better than that of the light-emitting layer, resulting in the light-emitting layer being disconnected at the sharp corners, causing a short circuit between the charge generation layer and the cathode, resulting in uneven low grayscale display and poor uniformity of large panels.

[0003] Therefore, the existing OLED display panel has a technical problem of short circuit between the charge generating layer and the cathode. SUMMARY OF THE INVENTION

[0004] The embodiments of the present application provide an OLED display panel and a terminal device, which can alleviate the technical problem of short circuit between the charge generation layer and the cathode in existing OLED display panels.

[0005] An embodiment of the present application provides an OLED display panel, comprising:

[0006] an array substrate;

[0007] a planar layer, the planar layer being disposed on the array substrate;

[0008] an anode, the anode being arranged on a side of the planar layer away from the array substrate;

[0009] a pixel definition layer, the pixel definition layer being disposed on a side of the planar layer and the anode away from the array substrate, the pixel definition layer being provided with a pixel opening, the anode being exposed at the pixel opening, the pixel definition layer comprising a first portion and a second portion spaced apart between adjacent anodes, the second portion being disposed on a side of the first portion closer to the anode;

[0010] a metal oxide layer, the metal oxide layer being disposed on a side of the pixel definition layer away from the array substrate, the metal oxide layer comprising a third portion and a fourth portion that are spaced apart, the third portion being disposed on a side of the first portion away from the array substrate, an edge of the third portion being disposed beyond an edge of the first portion, and the fourth portion being disposed on a side of the second portion away from the array substrate, an edge of the fourth portion being disposed beyond an edge of the first portion;

[0011] In which, the OLED display panel also includes a leveling portion arranged around the first part and the third part, the leveling portion at least covering the second part and one end of the fourth part facing the first part and the third part, the leveling portion is inclined toward the first surface of the side adjacent to the first part and the third part, and the angle between the first surface and the upper surface of the flat layer in the direction away from the adjacent first part and the third part is less than 90 degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0013] FIG1 is a schematic cross-sectional view of an OLED display panel provided in the present application;

[0014] FIG2 is a schematic cross-sectional view of a light-emitting functional layer of an OLED display panel provided in the present application;

[0015] 3A to 3C are process state diagrams of the OLED display panel manufacturing method provided in this application.

[0016] Description of reference numerals:

[0017] Modes for Carrying Out the Invention

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0019] 1 , the OLED display panel 1 provided in the present application includes an array substrate 10, a planar layer 20, an anode 40, a pixel definition layer 30, and a metal oxide layer. The planar layer 20 is disposed on the array substrate 10, the anode 40 is disposed on a side of the planar layer 20 away from the array substrate 10, the pixel definition layer 30 is disposed on a side of the planar layer 20 and the anode 40 away from the array substrate 10, the pixel definition layer 30 is provided with a pixel opening H1, and the anode 40 is exposed at the pixel opening H1. The pixel definition layer 30 includes a first portion 501 and a second portion 502 spaced apart between adjacent anodes 40, the second portion 502 being disposed on a side of the first portion 501 close to the anode 40, the metal oxide layer being disposed on a side of the pixel definition layer 30 away from the array substrate 10, and the metal oxide layer 30 includes a third portion 503, a third portion 504, and a fourth portion 505. The fourth part 504 is provided on a side of the first part 501 away from the array substrate 10, and the edge of the third part 503 is provided beyond the edge of the first part 501; the fourth part 504 is provided on a side of the second part 502 away from the array substrate 10, and the edge of the fourth part 504 is provided beyond the edge of the first part 501; the OLED display panel further includes a leveling portion 60 provided around the first part 501 and the third part 503, the leveling portion 60 at least covering one end of the second part 502 and the fourth part 504 facing the first part 501 and the third part 503, the leveling portion 60 is inclined toward the first surface 100 adjacent to the first part 501 and the third part 503, and the angle between the first surface 100 and the upper surface of the flat layer 20 in the direction away from the first undercut structure 50 is less than 90 degrees.

[0020] The OLED display panel 1 includes a plurality of via holes H2.

[0021] The first undercut structure 50 includes a first portion 501 and a third portion 503 that are stacked. The third portion 503 is disposed on a side of the first portion 501 away from the flat layer 20 , and an edge of the third portion 503 extends beyond an edge of the first portion 501 .

[0022] In this embodiment, a flattening portion 60 is provided around the first portion 501 and the third portion 503, and the flattening portion 60 covers one end of the second portion 502 and the fourth portion 504 facing the first portion 501 and the third portion 503. The flattening portion 60 is inclined toward the first surface 100 on the side adjacent to the first portion 501 and the third portion 503. The angle between the first surface 100 and the upper surface of the flat layer 20 in the direction away from the first undercut structure 50 is less than 90 degrees, so that the light-emitting layer 80, the cathode 90, and the charge generation layer 70 have good film-forming properties at the first surface 100 and are all continuously provided. The light-emitting layer 80 is used to insulate and separate the cathode 90 from the charge generation layer 70 at the first surface 100, thereby alleviating the technical problem of short circuit between the charge generation layer 70 and the cathode 90 in the existing OLED display panel 1.

[0023] The technical solution of this application is now described in conjunction with specific embodiments.

[0024] The embodiments of the present application are described only using a display panel having a stacked device as an example, and are also applicable to other types of display panels with short-circuit problems. The stacked device here refers to: having a charge generation layer 70, and a light-emitting functional layer having at least two light-emitting sub-layers of the same light-emitting color in the film thickness direction, and the light-emitting sub-layers are stacked; wherein, the charge-generation layer 70 (charge-generation layer, CGL)

[0025] In addition, the range of values ​​of the groove width or width, the selected materials, etc. described below in this application are only described as the best or better implementation method. Other methods that can meet the inventive concept of this application should also fall within the scope of protection of the present invention and will not be repeated here.

[0026] It should be noted that the first part and the third part constitute the second undercut structure 140, and the second part and the fourth part constitute the first undercut structure 50. The following content is described using the first undercut structure and the second undercut structure as examples.

[0027] In one embodiment, referring to FIG. 1 , the flattening portion 60 is disposed to wrap the second undercut structure 140 , and the first surface 100 is the surface of the flattening portion 60 facing the adjacent first undercut structure 50 .

[0028] It can be understood that the second undercut structure 140 includes a second part 502 and a fourth part 504 arranged in a stacked manner, the fourth part 504 is arranged on the side of the second part 502 away from the flat layer 20, and the edge of the fourth part 504 is arranged beyond the edge of the second part 502. The second undercut structure 140 is wrapped by the flattening portion 60, so that the light-emitting layer 80 at the edge of the second undercut structure 140 is arranged on the first surface 100, and the light-emitting layer 80 can be continuously arranged to insulate and separate the cathode 90 from the charge generation layer 70.

[0029] In one embodiment, referring to FIG2 , the OLED display panel 1 further includes a light-emitting functional layer, the light-emitting functional layer including the anode 40, the light-emitting layer 80, and the cathode 90, the light-emitting layer 80 including at least two light-emitting sublayers of the same light-emitting color arranged along the film thickness direction, and a charge generation layer 70 is arranged between adjacent light-emitting sublayers.

[0030] In which, the light-emitting sublayer includes a first light-emitting sublayer 801 and a second light-emitting sublayer 802 stacked on the side of the first light-emitting sublayer 801 away from the array substrate 10, the charge generation layer 70 includes a first charge generation layer 701 arranged in contact with the first light-emitting sublayer 801 and a second charge generation layer 702 arranged in contact with the second light-emitting sublayer 802, the first charge generation layer 701, the first light-emitting sublayer 801, and the anode 40 constitute a first light-emitting unit, and the second charge generation layer 702, the second light-emitting sublayer 802, and the cathode 90 constitute a second light-emitting unit.

[0031] Among them, the light-emitting functional layer also includes a hole transport layer 110 and an electron transport layer 120. The hole transport layer 110 is arranged on the side surface of the first light-emitting sublayer 801 facing the anode 40, and the electron transport layer 120 is arranged on the side surface of the second light-emitting sublayer 802 away from the flat layer 20.

[0032] It can be understood that the first charge generation layer 701 acts as the cathode 90 in the first light-emitting unit, and the second charge generation layer 702 acts as the anode 40 in the second light-emitting unit. The first light-emitting unit and the second light-emitting unit are stacked and have the same light-emitting color, which can enhance light output.

[0033] In this embodiment, the light output intensity is improved by at least stacking the first light emitting unit and the second light emitting unit having the same light emitting color.

[0034] In one embodiment, the charge generation layer 70 and the cathode 90 are respectively located on both sides of a light-emitting sublayer. At the first surface 100, the light-emitting layer 80, the charge generation layer 70, and the cathode 90 are all continuously arranged.

[0035] Please refer to FIG. 2 , the light-emitting sublayer may be the second light-emitting sublayer 802 .

[0036] It can be understood that at the first surface 100, due to the inclined surface design with an angle less than 90 degrees between the first surface 100 and the upper surface of the flat layer 20 in the direction away from the first undercut structure 50, the light-emitting layer 80, the charge generation layer 70 and the cathode 90 on the first surface 100 are arranged continuously, separating the charge generation layer 70 and the cathode 90 to avoid short circuit between the two.

[0037] In one embodiment, the material of the flattening portion 60 is different from that of the pixel definition layer 30 , the material of the first portion 501 is the same as that of the pixel definition layer 30 , and the material of the third portion 503 is metal oxide.

[0038] The first portion 501 can be prepared in the same layer as the pixel definition layer 30 .

[0039] The flattening portion 60 may be made of an organic material or an inorganic material.

[0040] In one embodiment, an annular groove is formed between adjacent sub-pixels, and the width of the annular groove ranges from 2 micrometers to 10 micrometers.

[0041] The annular groove is arranged between adjacent sub-pixels, and the annular groove is used to form the undercut structure.

[0042] In one embodiment, the width a of the edge of the third portion 503 extending beyond the edge of the first portion 501 ranges from 0.1 micrometers to 0.3 micrometers.

[0043] It can be understood that although the light-emitting layer 80 is discontinuous at the edge of the bottom cut structure, since the light-emitting layer 80 at the bottom cut structure is disconnected from both sides, even if there is a short circuit between the cathode 90 above the bottom cut structure and the charge generation layer 70, since the cathode 90 above the bottom cut structure and the charge generation layer 70 are disconnected from both sides, it will not cause technical problems such as uneven low grayscale display and poor uniformity of large panels.

[0044] It is understandable that if the width of the edge of the third part 503 beyond the edge of the first part 501 is too small, for example, less than 0.1 microns, it is easy for the light-emitting layer 80 to be continuously arranged at the bottom cut structure, thereby causing leakage current between adjacent sub-pixels and causing the problem of stealing light.

[0045] In this embodiment, by limiting the width of the edge of the third part 503 beyond the edge of the first part 501 to a range of 0.1 microns to 0.3 microns, the light-emitting layer 80 is disconnected at the bottom cut structure, and there is no lateral leakage current between adjacent sub-pixels. At the same time, the first inorganic layer can be deposited completely and continuously at the bottom cut structure, thereby ensuring a better packaging effect.

[0046] In one embodiment, the light emitting layer 80 is disconnected at the edge of the third portion 503 .

[0047] It can be understood that by disconnecting the light-emitting layer 80 at the bottom cut structure, the lateral leakage current between adjacent sub-pixels can be cut off, thereby avoiding the generation of lateral leakage current when one sub-pixel emits light, so that the adjacent sub-pixels can also be lit to a certain extent, which alleviates the technical problem of stealth lighting in the existing OLED display panel 1.

[0048] In this embodiment, the light-emitting layer 80 is disconnected by the undercut structure, and there is no lateral leakage current between adjacent sub-pixels, and the problem of stealth lighting does not occur.

[0049] In one embodiment, the OLED display panel 1 further includes an encapsulation layer, and the encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer. The first inorganic layer is continuously disposed in the via hole H2.

[0050] It is understandable that if the width of the edge of the third portion 503 exceeds the width of the edge of the first portion 501 by too much, for example, greater than 0.3 microns, the first inorganic layer may be disconnected at the bottom cut structure, resulting in poor packaging effect.

[0051] In this embodiment, the width a of the edge of the third portion 503 extending beyond the edge of the first portion 501 is in the range of 0.1 micron to 0.3 micron, and the first inorganic layer can be deposited completely and continuously at the bottom cut structure, thereby improving the packaging effect.

[0052] In the present application, a circle of flattening portion 60 is arranged around the first undercut structure 50, please refer to Figure 1, and the second undercut structure 140 is wrapped by the flattening portion 60. The surface of the flattening layer 60 facing the first undercut structure 50, that is, the first surface 100, is inclined in a certain direction. The angle between the first surface 100 and the upper surface of the flat layer 20 in the direction away from the first undercut structure 50 is less than 90 degrees, so that the second undercut structure 140 can be continuously arranged toward the light-emitting layer 80 at the edge of the first undercut structure 50.

[0053] The method for preparing the OLED display panel 1 provided in the present application is used to prepare any of the above embodiments, including:

[0054] S1: providing a semi-finished substrate having an array substrate 10, a planar layer 20, and an anode 40;

[0055] S2: forming an organic material layer 130 and depositing a metal material layer on the organic material layer 130;

[0056] S3: etching the metal material layer to form the third portion 503 and the fourth portion 504;

[0057] S4: Etching the organic material layer 130 to obtain a pixel definition layer 30 including a first portion 501 and a second portion 502. The first portion 501 and the third portion 503 are stacked to form a first undercut structure 50. The second portion 502 and the fourth portion 504 are stacked to form the first undercut structure 50. The pixel definition layer 30 includes pixel openings H1 and via holes H2 that are spaced apart.

[0058] S5: A flattening portion 60 is formed on the pixel definition layer 30, and the flattening portion 60 is inclined toward the first surface 100 on the side adjacent to the first undercut structure 50, and the angle between the first surface 100 and the upper surface of the flat layer 20 in the direction away from the first undercut structure 50 is less than 90 degrees.

[0059] Please refer to FIG. 3A , which shows a semi-finished substrate having an array substrate 10 , a planar layer 20 , and an anode 40 . An organic material layer 130 is coated on the planar layer 20 .

[0060] 3B , a metal material layer is deposited on the organic material layer 130 and etched twice, ie, steps S3 and S4 , to form a first undercut structure 50 , a second undercut structure 140 , a pixel opening H1 , and a via H2 .

[0061] 3C , the flattened portion 60 is prepared by a coating process, and the second undercut structure 140 near the anode 40 is coated to prepare the flattened layer 60 . The flattened layer 60 is used to make the light-emitting layer 80 at the edge of the second undercut structure 140 continuously arranged.

[0062] Optionally, in some embodiments of the present application, the flattening portion wraps around the first undercut structure.

[0063] Optionally, in some embodiments of the present application, the OLED display panel further includes a light-emitting functional layer, the light-emitting functional layer includes the anode, the light-emitting layer, and the cathode, the light-emitting layer includes at least two light-emitting sublayers of the same light-emitting color arranged along the film thickness direction, and a charge generation layer is arranged between adjacent light-emitting sublayers.

[0064] Optionally, in some embodiments of the present application, the charge generation layer and the cathode are respectively located on both sides of the light-emitting sublayer, and at the first surface, the light-emitting layer, the charge generation layer, and the cathode are all continuously arranged.

[0065] Optionally, in some embodiments of the present application, the preparation material of the flattening portion is different from the preparation material of the pixel definition layer, the preparation material of the first part is the same as the preparation material of the pixel definition layer, and the preparation material of the third part is metal oxide.

[0066] Optionally, in some embodiments of the present application, the width of the edge of the third portion exceeding the edge of the first portion ranges from 0.1 micrometers to 0.3 micrometers.

[0067] Optionally, in some embodiments of the present application, the light-emitting layer is discontinuous at the edge of the third portion. Optionally, in some embodiments of the present application, the OLED display panel further comprises an encapsulation layer, the encapsulation layer comprising a first inorganic layer, an organic layer, and a second inorganic layer, wherein the first inorganic layer is continuously arranged.

[0068] Optionally, in some embodiments of the present application, an annular groove is formed between adjacent sub-pixels, and the width of the annular groove ranges from 2 microns to 10 microns.

[0069] Beneficial effect: A flattening portion is arranged around the first part and the third part, and the flattening portion covers the second part and one end of the fourth part facing the first part and the third part. The flattening portion is inclined toward the first surface on the side adjacent to the first part and the third part. The angle between the first surface and the upper surface of the flat layer in the direction away from the second undercut structure is less than 90 degrees, so that the light-emitting layer, the cathode, and the charge generation layer have good film forming properties at the first surface and are all continuously arranged. The continuously arranged light-emitting layer is used at the first surface to insulate and separate the cathode from the charge generation layer, thereby alleviating the technical problem of short circuit between the charge generation layer and the cathode in existing OLED display panels.

[0070] The present application also proposes a display module, a display device, and a terminal device. The display module, the display device, and the terminal device all include the above-mentioned OLED display panel, which will not be described in detail here.

[0071] The OLED display panel provided by the embodiment of the present application includes a first part, a second part, a third part, and a fourth part located between adjacent anodes, the third part is arranged above the first part and its edge exceeds the edge of the first part, the fourth part is arranged above the second part and its edge exceeds the edge of the second part, the flattening portion at least covers one end of the second part and the fourth part facing the first part and the third part, the flattening portion is inclined toward the first surface of the side adjacent to the first part, and the angle between the first surface and the upper surface of the flat layer in the direction away from the second undercut structure is less than 90 degrees; by having a flat first surface, the cathode and the charge generation layer are insulated and separated by a continuously arranged light-emitting layer at the first surface, thereby avoiding the light-emitting layer at the edge of the first undercut structure being disconnected, resulting in a short circuit between the charge generation layer and the cathode.

[0072] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0073] The above is a detailed introduction to the OLED display panel and the method for preparing an OLED display panel provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An OLED display panel, comprising: An array substrate; A planar layer, wherein the planar layer is disposed on the array substrate; an anode, the anode being arranged on a side of the planar layer away from the array substrate; a pixel definition layer, the pixel definition layer being arranged on a side of the planar layer and the anode away from the array substrate, the pixel definition layer being provided with a pixel opening, the anode being exposed at the pixel opening, the pixel definition layer comprising a first portion and a second portion being arranged at intervals between adjacent anodes, the second portion being arranged on a side of the first portion close to the anode; a metal oxide layer, the metal oxide layer being arranged on a side of the pixel definition layer away from the array substrate, the metal oxide layer comprising a third portion and a fourth portion arranged at intervals, the third portion being arranged on a side of the first portion away from the array substrate, an edge of the third portion being arranged beyond an edge of the first portion, the fourth portion being arranged on a side of the second portion away from the array substrate, an edge of the fourth portion being arranged beyond an edge of the first portion; Among them, the OLED display panel also includes a leveling portion arranged around the first part and the third part, the leveling portion at least covers the second part and one end of the fourth part facing the first part and the third part, the leveling portion is inclined toward the first surface of the side adjacent to the first part and the third part, and the angle between the first surface and the upper surface of the flat layer in the direction away from the adjacent first part and the third part is less than 90 degrees.

2. The OLED display panel according to claim 1, wherein: The flattening portion wraps around the first undercut structure.

3. The OLED display panel according to claim 2, wherein: The OLED display panel further comprises a light-emitting functional layer, wherein the light-emitting functional layer comprises the anode, the light-emitting layer and the cathode, and the light-emitting layer comprises at least two light-emitting sub-layers of the same light-emitting color arranged along a film thickness direction.

4. The OLED display panel according to claim 3, wherein: A charge generation layer is arranged between adjacent light-emitting sublayers.

5. The OLED display panel according to claim 4, wherein: The light-emitting sublayer includes a first light-emitting sublayer and a second light-emitting sublayer stacked on the side of the first light-emitting sublayer away from the array substrate, and the charge generating layer includes a first charge generating layer arranged in contact with the first light-emitting sublayer and a second charge generating layer arranged in contact with the second light-emitting sublayer, wherein the first charge generating layer, the first light-emitting sublayer and the anode constitute a first light-emitting unit, and the second charge generating layer, the second light-emitting sublayer and the cathode constitute a second light-emitting unit.

6. The OLED display panel according to claim 5, wherein: The light-emitting functional layer further includes a hole transport layer and an electron transport layer. The hole transport layer is arranged on a surface of the first light-emitting sublayer facing the anode, and the electron transport layer is arranged on a surface of the second light-emitting sublayer away from the planar layer.

7. The OLED display panel according to claim 4, wherein: The charge generation layer and the cathode are respectively located on both sides of a light-emitting sublayer. At the first surface, the light-emitting layer, the charge generation layer and the cathode are continuously arranged.

8. The OLED display panel according to claim 2, wherein: The material of the flattening portion is different from the material of the pixel definition layer.

9. The OLED display panel according to claim 8, wherein: The preparation material of the first part is the same as the preparation material of the pixel definition layer.

10. The OLED display panel according to claim 9, wherein: The preparation material of the third part is metal oxide.

11. The OLED display panel according to claim 10, wherein: The first part is arranged at the same layer as the pixel definition layer.

12. The OLED display panel according to claim 10, wherein: The flattened portion is made of organic material.

13. The OLED display panel according to claim 10, wherein: The flattening portion is made of inorganic material.

14. The OLED display panel according to claim 2, wherein: The width of the edge of the third portion beyond the edge of the first portion ranges from 0.1 micrometers to 0.3 micrometers.

15. The OLED display panel according to claim 14, wherein: The light emitting layer is disconnected at the edge of the third portion.

16. The OLED display panel according to claim 14, wherein: The OLED display panel further includes an encapsulation layer, which includes a first inorganic layer, an organic layer, and a second inorganic layer, wherein the first inorganic layer is continuously arranged.

17. The OLED display panel according to claim 1, wherein: An annular groove is formed between adjacent sub-pixels.

18. The OLED display panel according to claim 17, wherein: The groove width of the annular groove ranges from 2 microns to 10 microns.

19. A terminal device comprising the OLED display panel according to claim 1.

Images