CN111769140A

CN111769140A - Display panel and display module

Info

Publication number: CN111769140A
Application number: CN202010579081.0A
Authority: CN
Inventors: 樊聪聪; 龚文亮
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2020-10-13
Anticipated expiration: 2040-06-23
Also published as: CN111769140B

Abstract

The application provides a display panel and a display module, which comprise an array substrate, a pixel definition layer and a light-emitting device layer, wherein the pixel definition layer and the light-emitting device layer are positioned on the array substrate. The light emitting device layer includes an anode layer, a light emitting layer including a plurality of light emitting cells, and a cathode layer. This application is through setting up an at least first recess between adjacent two this luminescence units for this cathode layer is connected with this pixel definition layer through this first recess, has increased the area of contact of this cathode layer with this pixel definition layer, has improved the adhesion effort between the interior rete of luminescent device layer, has avoided the interior rete of luminescent device layer to appear the technical problem of separation.

Description

Display panel and display module

Technical Field

The application relates to the field of display, in particular to a display panel and a display module.

Background

In the flat panel display technology, an Organic Light-Emitting Diode (OLED) display has many advantages of being Light and thin, Emitting Light actively, fast in response speed, large in visible angle, wide in color gamut, high in brightness, low in power consumption, and the like, and is gradually becoming a third generation display technology following the liquid crystal display.

In the prior art, an OLED display panel is generally used as a flexible display panel, and in a curling or dynamic bending process, a phenomenon of film separation occurs in an inner film layer of a light emitting device layer, which causes a technical problem of abnormal display of the display panel.

Therefore, a display panel is needed to solve the above technical problems.

Disclosure of Invention

The application provides a display panel and display module to solve the technical problem that the rete separation appears in the inside rete of present flexible display panel at crooked or developments folding in-process panel.

In order to solve the above problems, the technical solution provided by the present application is as follows:

the application provides a display panel, which comprises an array substrate, a pixel definition layer and a light-emitting device layer which are positioned on the array substrate, and an encapsulation layer positioned on the light-emitting device layer;

the light emitting device layer comprises an anode layer positioned on the array substrate, a light emitting layer positioned on the anode layer, and a cathode layer positioned on the light emitting layer, wherein the light emitting layer comprises a plurality of light emitting units;

at least one first groove is arranged between every two adjacent light-emitting units, and the cathode layer is connected with the pixel definition layer through the first grooves.

In the display panel of the present application, the light emitting device layer further includes a first common layer between the anode layer and the light emitting layer, and a second common layer between the light emitting layer and the cathode layer;

the first groove penetrates through the first common layer and the second common layer so as to expose part of the pixel defining layer;

the first groove is located in a non-pixel area of the display panel.

In the display panel of the present application,

the display panel further comprises a second groove positioned on the pixel defining layer;

the orthographic projection of the second groove on the array substrate is positioned in the orthographic projection of the first groove on the array piece, and the opening angle of the second groove is larger than or equal to that of the first groove;

wherein one first groove corresponds to at least one second groove.

In the display panel of the present application, the second groove penetrates through a portion of the pixel defining layer, and the cathode layer is connected to the pixel defining layer through the first groove and the second groove; or

The second groove penetrates through the pixel defining layer, and the cathode layer is connected with the pixel defining layer and the array substrate through the first groove and the second groove.

In the display panel of the present application,

the display panel further comprises at least one viscous device arranged in the first groove;

the adhesive device is located on the pixel defining layer and adjacent to the second groove.

In the display panel of the present application, the material of the adhesive means includes propylene glycol methyl ether acetate, polyisobutylene, butyl rubber, microcrystalline wax, chloroform; alternatively, the adhesive device further comprises a black dye.

In the display panel of the present application, the display panel further includes a third groove located on the array substrate, where the third groove penetrates through at least one film layer in the array substrate;

the orthographic projection of the third groove on the substrate of the array substrate is positioned in the orthographic projection of the second groove on the substrate, and the opening angle of the third groove is larger than or equal to that of the second groove;

wherein one of the second grooves corresponds to at least one of the third grooves.

In the display panel of the present application, at least one first convex surface and/or at least one first concave surface is further disposed on the pixel defining layer corresponding to the first groove;

the cathode layer is nested with the pixel defining layer by the first convex surface and/or the first concave surface.

In the display panel of the present application, the display panel further includes a filling layer located between the cathode layer and the encapsulation layer, and the filling layer corresponds to the first groove;

wherein the filler layer is composed of a flexible material.

The application has still provided a display module assembly, wherein, display panel includes above-mentioned display panel, and is located last polarizer layer of display panel and being located apron layer on the polarizer layer.

Has the advantages that: the application provides a display panel, which comprises an array substrate, a pixel definition layer and a light-emitting device layer, wherein the pixel definition layer and the light-emitting device layer are positioned on the array substrate. The light emitting device layer includes an anode layer, a light emitting layer including a plurality of light emitting cells, and a cathode layer. This application is through adjacent two set up an at least first recess between the luminescence unit, make the cathode layer passes through first recess with the pixel definition layer is connected, has increased the cathode layer with the area of contact on pixel definition layer has improved the adhesion effort between the interior rete of luminescent device layer, has avoided the interior rete of luminescent device layer to appear the technical problem of separation.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

FIG. 1 is a first structural diagram of a display panel according to the present application;

FIG. 2 is a second structural diagram of a display panel according to the present application;

FIG. 3 is a third structural diagram of a display panel according to the present application;

FIG. 4 is a fourth structural diagram of a display panel according to the present application;

FIG. 5 is a fifth structural diagram of a display panel according to the present application;

FIG. 6 is a sixth structural view of a display panel according to the present application;

fig. 7 is a seventh structural view of a display panel according to the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the prior art, an OLED display panel is generally used as a flexible display panel, and in a curling or dynamic bending process, a phenomenon of film separation occurs in an inner film layer of a light emitting device layer, which causes a technical problem of abnormal display of the display panel. The present application proposes the following technical solutions to solve the above technical problems.

Referring to fig. 1 to 7, the present application provides a display panel 100, which includes an array substrate 10, a pixel defining layer 20 and a light emitting device layer 30 on the array substrate 10, and an encapsulation layer 40 on the light emitting device layer 30;

the light emitting device layer 30 includes an anode layer 31 on the array substrate 10, a light emitting layer 32 on the anode layer 31, and a cathode layer 33 on the light emitting layer 32, and the light emitting layer 32 includes a plurality of light emitting cells;

at least one first groove 51 is disposed between two adjacent light emitting units, and the cathode layer 33 is connected to the pixel defining layer 20 through the first groove 51.

The display panel 100 includes an array substrate 10, a pixel defining layer 20 on the array substrate 10, and a light emitting device layer 30. The light emitting device layer 30 includes an anode layer 31, a light emitting layer 32, and a cathode layer 33, and the light emitting layer 32 includes a plurality of light emitting cells. This application makes the cathode layer 33 pass through two adjacent at least first recess 51 is set up between the luminescence unit first recess 51 with pixel definition layer 20 is connected, has increased the cathode layer 33 with the area of contact of pixel definition layer 20 has improved the adhesion effort between the rete in the luminescent device layer 30, has avoided the technical problem that the rete appears separating in the luminescent device layer 30

The technical solution of the present application will now be described with reference to specific embodiments.

Example one

Referring to fig. 1, the array substrate 10 may include a substrate 11 and a thin-film transistor layer 12 on the substrate 11. The substrate 11 may be a flexible substrate or a rigid substrate. When the substrate 11 is a flexible substrate, the substrate 11 may be made of glass, quartz, or the like. When the substrate 11 is a flexible substrate, the material of the substrate 11 may be polyimide or the like. Since the display panel 100 of the present application is a flexible display panel 100, in order to ensure the flexibility of the display panel 100, the substrate 11 of the present application is provided with a flexible substrate, and the material of the flexible substrate is not limited to the polyimide.

The thin-film transistor layer 12 may include a plurality of thin-film transistors. The thin film transistor may be of an etch-stop type, a back channel etch type, or a top gate thin film transistor type, and the like, and is not particularly limited.

For example, the thin film transistor of a top gate thin film transistor type may include an active layer 121 on the substrate 11, a gate insulating layer 122 on the active layer 121, a gate layer 123 on the gate insulating layer 122, an interlayer insulating layer 124 on the gate layer 123, a source drain layer 125 on the interlayer insulating layer 124, and a planarization layer 126 on the source drain layer 125.

In this embodiment, the top-gate thin film transistor is not limited to a single-gate structure, and may be provided as a double-gate structure or the like.

Referring to fig. 1, the light emitting device layer 30 includes an anode layer 31, a light emitting layer 32 and a cathode layer 33 formed on the array substrate 10.

The anode layer 31 is formed on the planarization layer 126. The anode layer 31 is mainly used to provide holes for absorbing electrons. In the present embodiment, a top-emission OLED device is taken as an example for illustration, and therefore, the anode layer 31 may be a non-transparent or transparent metal electrode.

The light emitting layer 32 is formed on the anode layer 31. The light emitting layer 32 is divided into a plurality of light emitting units by the pixel defining layer 20.

The cathode layer 33 is formed on the light emitting layer 32. The cathode layer 33 covers the light emitting layer 32 and the pixel defining layer 20 on the planarization layer 126.

In this embodiment, the materials of the anode layer 31 and the cathode layer 33 may be limited according to the light emitting type of the display panel 100. For example, when the display panel 100 is a top emission type display panel 100, the anode layer 31 may be made of a total reflection material, and the cathode layer 33 may be made of a semi-reflection material. When the display panel 100 is a bottom emission type display panel 100, the materials of the cathode layer 33 and the anode layer 31 are exchanged.

The light emitting device layer 30 forms a microcavity effect by total reflection and half reflection of the anode layer 31 and the cathode layer 33, so as to improve the light emitting efficiency of the light emitting device layer 30.

Referring to fig. 1, the light emitting device layer 30 further includes a first common layer 34 located between the anode layer 31 and the light emitting layer 32, and a second common layer 35 located between the light emitting layer 32 and the cathode layer 33.

In this embodiment, the first common layer 34 may further include a hole transport layer and a hole injection layer, and the second common layer 35 may further include an electron transport layer and an electron injection layer, and the specific materials thereof are the same as those in the prior art, and are not described herein again.

In this embodiment, the first groove 51 penetrates through the first common layer 34 and the second common layer 35 to expose a portion of the pixel defining layer 20, and the cathode layer 33 is connected to the pixel defining layer through the first groove 51, so that a contact panel between the cathode layer 33 and the pixel defining layer 20 is increased.

In this embodiment, the first groove 51 is located in a non-pixel region of the display panel 100.

In this embodiment, the first groove 51 and the boundary of the pixel defining layer 20 have a certain inclination angle, and the opening angle of the first groove 51 is 0 to 90 °.

Referring to fig. 2, at least one first protrusion 21 on the pixel defining layer 20 is further disposed in the first groove 51. The first bump 21 may be formed by the first common layer 34 and the second common layer 35 after patterning, or may be formed by other adhesive materials, organic materials, or the like, and is not limited herein.

In this embodiment, the arrangement of the first protrusion 21 increases the contact area between the cathode layer 33 and other film structures in the light emitting device layer 30, improves the acting force between the films in the light emitting device, and effectively avoids the technical problem of film separation of the display panel 100 in a bent or dynamically bent state.

Referring to fig. 3, an orthographic projection area of the first common layer 34 on the array substrate 10 is within an orthographic projection area of the second common layer 35 on the array substrate 10. The second common layer 35 is disposed to cover the first common layer 34, so that a contact area between the first common layer 34 and the second common layer 35 is increased, an acting force between films in the light emitting device is further increased, and a technical problem of film separation of the display panel 100 in a bent or dynamically bent state is solved.

Example two

This embodiment is the same as or similar to the first embodiment, except that:

referring to fig. 4, the display panel 100 further includes a second groove 52 on the pixel defining layer 20.

In this embodiment, an orthogonal projection of the second groove 52 on the array substrate 10 is located within an orthogonal projection of the first groove 51 on the array substrate 10. One of the first grooves 51 corresponds to at least one of the second grooves 52.

In the process, a first groove 51 may be first formed on the first common layer 34 and the second common layer 35 by using a first etching; next, at least one second recess 52 is formed on the basis of the first recess 51 by means of a second etching.

In the present embodiment, the opening angle of the second groove 52 is greater than or equal to the opening angle of the first groove 51. The opening angle of the second groove 52 is larger than that of the first groove 51, which not only reduces the difficulty of the manufacturing process, but also further increases the contact area between the cathode layer 33 and the pixel defining layer 20 in the second groove 52, and improves the acting force between the layers in the light emitting device.

Referring to fig. 4, the second groove 52 penetrates through a portion of the pixel defining layer 20, and the cathode layer 33 is connected to the pixel defining layer 20 through the first groove 51 and the second groove 52.

In fig. 4, the second groove 52 may further penetrate through the pixel defining layer 20, and the cathode layer 33 is connected to the pixel defining layer 20 and the planarization layer 126 of the array substrate 10 through the first groove 51 and the second groove 52.

Referring to fig. 5, based on fig. 4, the display panel 100 further includes at least one adhesive device 22 disposed in the first recess 51, and the adhesive device 22 may be disposed on the pixel defining layer 20.

In this embodiment, adhesive means 22 may be disposed adjacent to second recess 52.

In this embodiment, the adhesive means 22 material may include propylene glycol methyl ether acetate, polyisobutylene, butyl rubber, microcrystalline wax, and chloroform. Propylene glycol methyl ether acetate is a solvent that may be used to dissolve other substances in the material of adhesive device 22. The addition of chloroform may better improve the adhesion between the material of adhesive device 22 and light emitting device layer 30.

In this embodiment, in the preparation process of the adhesive device 22, the mass fractions of the added materials are: 54% propylene glycol methyl ether acetate, 23% polyisobutylene, 18% butyl rubber, 3% microcrystalline wax, and 2% chloroform. After the raw materials are prepared, the solvent of the material of adhesive device 22, i.e., propylene glycol methyl ether acetate, may be separated out by drying under reduced pressure, and the final remaining propylene glycol methyl ether acetate may account for less than 10% of the original mass fraction. Finally, patterning process is performed to form adhesive device 22 on pixel defining layer 20, which not only reduces the energy consumption and difficulty of the drying process, but also properly increases the flexibility of the material of adhesive device 22, thereby better improving the stress when display panel 100 is twisted.

In another embodiment of the present application, the material of adhesive device 22 includes propylene glycol methyl ether acetate, polyisobutylene, butyl rubber, microcrystalline wax, chloroform, and black dye. Due to the addition of the black dye, the adhesive device 22 can serve as a black light shielding layer in the color film layer, so that the thickness of the color film layer can be reduced, and color mixing between adjacent light emitting units can be avoided.

EXAMPLE III

The present embodiment is the same as or similar to the first embodiment or the second embodiment, except that:

referring to fig. 6, the display panel 100 may further include a third groove 53 on the array substrate 10, wherein the third groove 53 penetrates through at least one layer of the array substrate 10.

The orthographic projection of the third groove 53 on the substrate 11 of the array substrate 10 is located in the orthographic projection of the second groove 52 on the substrate 11, and one second groove 52 corresponds to at least one third groove 53.

In the process, a first groove 51 may be first formed on the first common layer 34 and the second common layer 35 by using a first etching; secondly, forming at least one second groove 52 on the basis of the first groove 51 by using a second etching; finally, at least one third recess 53 is formed on the basis of the second recess 52 by means of a third etch.

In the present embodiment, the opening angle of the third groove 53 is greater than or equal to the opening angle of the second groove 52. Similar to the second embodiment, the opening angle of the third groove 53 is larger than the opening angle of the second groove 52, which not only reduces the difficulty of the manufacturing process, but also further increases the contact area between the cathode layer 33 and the film layer in the third groove 53, improves the acting force between the film layers in the light emitting device, and also improves the acting force between the cathode layer 33 and the array substrate 10.

In this embodiment, the third groove 53 may penetrate a portion of the planarization layer 126. Alternatively, the third groove 53 may extend through all of the planarization layer 126 or through an insulating film layer disposed adjacent to the planarization layer 126.

In the first to third embodiments, at least one first convex surface and/or at least one first concave surface is further disposed on the pixel defining layer 20 corresponding to the first groove 51, and the cathode layer 33 is disposed on the pixel defining layer 20 by nesting the first convex surface and/or the first concave surface.

In this embodiment, by providing a plurality of first convex surfaces or/and first concave surfaces on the pixel defining layer 20 corresponding to the first groove 51, the contact area between the pixel defining layer 20 and the cathode layer 33 is further increased, and the acting force between the film layers in the light emitting device layer 30 is increased.

In this embodiment, the surfaces of the second groove 52 and the third groove 53 may also be provided with corresponding convex surfaces and concave surfaces. The shape of the corresponding concave surface and convex surface can be triangle, cambered surface, etc., and the application is not limited specifically.

Referring to fig. 7, the display panel 100 may further include a filling layer 50 located between the cathode layer 33 and the encapsulation layer 40, wherein the filling layer 50 corresponds to the first groove 51. The first recess 51 extends through the first common layer 34, the second common layer 35, and the pixel defining layer 20.

In this embodiment, the filling layer 50 is made of a flexible material.

The filling layer 50 is used to fill the light emitting device layer 30 to ensure the flatness of the panel. In addition, the filling layer 50 may be provided to embed the cathode layer 33 in the light emitting device layer 30 as a snap, so as to further avoid the separation of the cathode layer 33 from the inner film layer of the light emitting device layer 30.

In this embodiment, the material of the filling layer 50 may be the same as that of the bonding device, and the force between the light emitting device layer 30 and the encapsulation layer 40 is increased by the viscosity of the filling layer 50.

In the above embodiment, the encapsulation layer 40 may be a thin film encapsulation layer, which may include a first inorganic layer, a first organic layer on the first inorganic layer, and a second inorganic layer on the first organic layer. The specific structure is the same as or similar to the prior art, and is not described in detail herein.

The application has still provided a display module assembly, wherein, display panel includes above-mentioned display panel, and is located last polarizer layer of display panel and being located apron layer on the polarizer layer. The working principle of the display module is the same as or similar to that of the display panel, and the tracing is not carried out here.

The application provides a display panel and a display module, which comprises an array substrate, a pixel definition layer and a light-emitting device layer, wherein the pixel definition layer and the light-emitting device layer are positioned on the array substrate. The light emitting device layer includes an anode layer, a light emitting layer including a plurality of light emitting cells, and a cathode layer. This application is through adjacent two set up an at least first recess between the luminescence unit, make the cathode layer passes through first recess with the pixel definition layer is connected, has increased the cathode layer with the area of contact on pixel definition layer has improved the adhesion effort between the interior rete of luminescent device layer, has avoided the interior rete of luminescent device layer to appear the technical problem of separation.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The foregoing describes in detail an electronic device provided in an embodiment of the present application, and a specific example is applied to illustrate the principle and the implementation of the present application, and the description of the foregoing embodiment is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A display panel is characterized by comprising an array substrate, a pixel definition layer and a light-emitting device layer which are positioned on the array substrate, and an encapsulation layer positioned on the light-emitting device layer;

2. The display panel according to claim 1,

the light emitting device layer further includes a first common layer between the anode layer and the light emitting layer, and a second common layer between the light emitting layer and the cathode layer;

the first groove is located in a non-pixel area of the display panel.

3. The display panel according to claim 1,

wherein one first groove corresponds to at least one second groove.

4. The display panel according to claim 3,

the second groove penetrates through part of the pixel defining layer, and the cathode layer is connected with the pixel defining layer through the first groove and the second groove; or

5. The display panel according to claim 3,

6. The display panel according to claim 5,

the materials of the viscous device comprise propylene glycol methyl ether acetate, polyisobutylene, butyl rubber, microcrystalline wax and trichloromethane; alternatively, the adhesive device further comprises a black dye.

7. The display panel according to claim 3,

the display panel further comprises a third groove positioned on the array substrate, and the third groove penetrates through at least one film layer in the array substrate;

8. The display panel according to claim 1, wherein the pixel defining layer corresponding to the first groove is further provided with at least one first convex surface and/or at least one first concave surface;

9. The display panel of claim 1, further comprising a filling layer between the cathode layer and the encapsulation layer, the filling layer corresponding to the first groove;

wherein the filler layer is composed of a flexible material.

10. A display module, wherein the display panel comprises the display panel according to any one of claims 1 to 9, a polarizer layer on the display panel, and a cover plate layer on the polarizer layer.