WO2018218626A1

WO2018218626A1 - Cathode composite layer, display screen and manufacturing method

Info

Publication number: WO2018218626A1
Application number: PCT/CN2017/086890
Authority: WO
Inventors: 熊娜娜
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2017-06-01
Filing date: 2017-06-01
Publication date: 2018-12-06
Also published as: CN108475683A

Abstract

A cathode composite layer (10). The cathode composite layer (10) is used for a display screen (100). The cathode composite layer (10) comprises a first cathode layer (12), a second cathode layer (14) and a third cathode layer (16). The first cathode layer (12) is formed of a low work function metal. The second cathode layer (14) is provided on the first cathode layer (12), and the second cathode layer (14) is made of a first conductive thin film having ductility. The third cathode layer (16) is provided on the second cathode layer (14), and the third cathode layer (16) is made of a transparent second conductive thin film. The first cathode layer (12), the second cathode layer (14) and the third cathode layer (16) form a saw wheel-shaped engagement structure. Further disclosed are a display screen (100) and a manufacturing method.

Description

Cathode composite layer, display screen and manufacturing method

Technical field

The present invention relates to the field of display technologies, and in particular, to a cathode composite layer, a display screen, and a manufacturing method.

Background technique

The bending resistance of the flexible display substrate directly determines the life of the flexible display. The arrangement of the cathode of the flexible display substrate on the flexible display screen is generally a large metal distribution. When the flexible display substrate is bent, the cathode metal is easily broken, resulting in uneven distribution of the cathode potential on the entire surface of the flexible display screen. Produces uneven color, which affects the yield of the product.

Summary of the invention

Embodiments of the present invention provide a cathode composite layer, a display screen, and a method of fabricating the same.

The cathode composite layer of the embodiment of the invention is used for a display screen, and the cathode composite layer comprises:

a first cathode layer formed of a metal having a low work function;

a second cathode layer disposed on the first cathode layer, the second cathode layer being made of a first conductive film having ductility;

a third cathode layer disposed on the second cathode layer, the third cathode layer being made of a transparent second conductive film, the first cathode layer, the second cathode layer, and the third cathode The layers form a saw wheel engagement structure.

In the cathode composite layer of the embodiment of the invention, the first cathode layer, the second cathode layer and the third cathode layer form a saw wheel occlusion structure, so that the cathode composite layer stress can be dispersed from the three-dimensional structure when the display screen is bent Distribution, so as to maximize the resistance to bending.

In certain embodiments, the second cathode layer is honeycomb shaped, the honeycomb comprises a plurality of meshes, and the third cathode layer comprises a cathode portion filling the mesh.

In certain embodiments, the cathode portion is coupled to the first cathode layer.

In certain embodiments, the first conductive film comprises graphene.

In some embodiments, the area of the third cathode layer is greater than the area of the second cathode layer, and the area of the second cathode layer is greater than the area of the first cathode layer.

In some embodiments, the area of the third cathode layer is smaller than the area of the second cathode layer, and the area of the second cathode layer is smaller than the area of the first cathode layer.

A display screen according to an embodiment of the present invention includes a cathode composite layer of an embodiment of the present invention.

In the display screen of the embodiment of the invention, the first cathode layer, the second cathode layer and the third cathode layer form a saw bite The structure is combined, so that when the display screen is bent, the stress distribution of the cathode composite layer can be dispersed from the three-dimensional three-dimensional structure, thereby maximally resisting the bending.

In some embodiments, the display screen comprises:

Anode layer; and

A light emitting layer disposed on the anode layer, the cathode composite layer being disposed on the light emitting layer.

In certain embodiments, the first conductive film comprises graphene.

In some embodiments, the display screen includes a display area, the area of the first cathode layer being greater than the area of the display area.

A manufacturing method of an embodiment of the present invention for manufacturing a cathode composite layer, the manufacturing method comprising:

Providing a first cathode layer, the first cathode layer being a metal having a low work function;

Forming a second cathode layer on the first cathode layer, the second cathode layer being made of a first conductive film having ductility; and

Forming a third cathode layer on the second cathode layer, the third cathode layer being made of a transparent second conductive film, the first cathode layer, the second cathode layer, and the third cathode layer Forming a saw wheel bite structure.

In the manufacturing method of the embodiment of the present invention, the first cathode layer, the second cathode layer and the third cathode layer form a saw wheel occlusion structure, so that when the display screen is bent, the stress distribution of the cathode composite layer can be dispersed from the three-dimensional three-dimensional structure In order to maximize the resistance to bending.

In some embodiments, the forming the second cathode layer on the first cathode layer comprises:

Forming the second cathode layer on the grid-like support;

Applying glue on the second cathode layer, the gap between the second cathode layers, and the gap between the supports;

Removing the support to form the second cathode layer with a colloid;

Locating the second cathode layer with the colloid on the first cathode layer; and

The colloid is removed.

In certain embodiments, the first conductive film comprises graphene.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the appended claims

1 is a schematic cross-sectional view of a cathode composite layer according to an embodiment of the present invention;

2 is a schematic cross-sectional view showing a state in which a cathode composite layer according to an embodiment of the present invention is subjected to bending;

3 is a schematic flow chart of a manufacturing method according to an embodiment of the present invention;

4 is a schematic cross-sectional view of a display screen according to an embodiment of the present invention;

5 is a schematic flow chart of a manufacturing method according to another embodiment of the present invention;

6 is a schematic view showing a process flow of a manufacturing method according to an embodiment of the present invention;

7 is a schematic structural view of a second cathode layer according to an embodiment of the present invention;

8 is a schematic plan view of a display screen according to an embodiment of the present invention;

Description of main components and symbols:

Cathode composite layer 10, first cathode layer 12, second cathode layer 14, mesh 142, third cathode layer 16, cathode portion 162, anode layer 20, luminescent layer 30, outer frame 40, display region 50, display screen 100 .

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the embodiments of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "previous" "," "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "reverse" The orientation or positional relationship indicated by the hour hand or the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the embodiments and the simplified description of the present invention, and does not indicate or imply that the device or component referred to has a specific Azimuth, construction and operation in a particular orientation are therefore not to be construed as limiting the embodiments of the invention. In addition, the terms "first" and "second" 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 defining "first", "second" may explicitly or implicitly include one or more of the features. In the description, "a plurality" means two or more, unless specifically defined otherwise.

In the description of the embodiments of the present invention, it should be noted that the terms "installation", "connected", and "connected" should be understood broadly, and may be a fixed connection, for example, or They are detachable or integrally connected; they can be mechanically connected, they can be electrically connected or can communicate with each other; they can be connected directly or indirectly through an intermediate medium, which can be internal or two components of two components. Interaction relationship. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood on a case-by-case basis.

In the embodiments of the present invention, the "on" or "below" of the second feature may include direct contact of the first and second features, and may also include the first sum, unless otherwise specifically defined and defined. The second feature is not in direct contact but through additional features between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and below the second feature, or merely the first feature level being less than the second feature.

The following disclosure provides many different embodiments or examples for implementing different structures of embodiments of the present invention. In order to simplify the disclosure of embodiments of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the invention. In addition, the embodiments of the present invention may repeat reference numerals and/or reference letters in different examples, which are for the purpose of simplicity and clarity, and do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. . Moreover, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art will recognize the use of other processes and/or the use of other materials.

Referring to FIGS. 1 and 2, a cathode composite layer 10 of an embodiment of the present invention is used for the display screen 100. The cathode composite layer 10 includes a first cathode layer 12, a second cathode layer 14, and a third cathode layer 16. The first cathode layer 12 is formed of a metal having a low work function. The second cathode layer 14 is disposed on the first cathode layer 12, and the second cathode layer 14 is made of a ductile first conductive film. The third cathode layer 16 is disposed on the second cathode layer 14, and the third cathode layer 16 is made of a transparent second conductive film. The first cathode layer 12, the second cathode layer 14, and the third cathode layer 16 form a saw wheel engagement structure.

Referring to FIG. 3, the manufacturing method of the embodiment of the present invention is used to manufacture the cathode composite layer 10. Manufacturing methods include:

Step S12: providing a first cathode layer 12, the first cathode layer 12 being a metal having a low work function;

Step S14: forming a second cathode layer 14 on the first cathode layer 12, the second cathode layer 14 being made of a ductile first conductive film;

Step S16: forming a third cathode layer 16 on the second cathode layer 14, the third cathode layer 16 being made of a transparent second conductive film, the first cathode layer 12, the second cathode layer 14, and the third cathode layer 16 being formed The saw wheel bite structure.

The manufacturing method of the embodiment of the present invention can be used to manufacture the cathode composite layer 10 of the embodiment of the present invention. For example, step S12 can be used to provide the first cathode layer 12, step S14 can be used to set the second cathode layer 14, and step S16 can be used to set the third cathode layer 16.

In the cathode composite layer 10 and the manufacturing method of the embodiment of the present invention, the first cathode layer 12, the second cathode layer 14, and the third cathode layer 16 form a saw wheel engagement structure, and therefore, when the display screen 100 is bent, it can be three-dimensionally The three-dimensional structure disperses the stress distribution of the cathode composite layer 10, thereby maximally resisting bending.

In one example, the first cathode layer 12 may be formed by evaporating a low work function metal on a display substrate on which an OLED (Organic Light-Emitting Diode) material has been evaporated. Specifically, the metal having a low work function may be one of magnesium, calcium, sodium, potassium, titanium, indium, antimony, lithium, antimony, aluminum, silver, tin, lead, or the like, or may be an alloy of the above metals. The second cathode layer 14 may be formed by deposition of a first conductive film having better ductility. The third cathode layer 16 may be formed by depositing a transparent second conductive film. The vapor deposition method may be a thermal evaporation method, an electron beam evaporation method, or the like. The deposition method may be a physical vapor deposition method or the like. Wherein, the first conductive film may be deposited to form some patterns (for example, a zigzag pattern or a honeycomb pattern, etc.) so that the first cathode layer 12, the second cathode layer 14, and the third cathode layer 16 form a saw wheel occlusion structure.

It is to be noted that the method of forming the first cathode layer 12, the second cathode layer 14, and the third cathode layer 16 is not limited to the method of vapor deposition and the method of deposition, and may be formed using other conventional methods.

In certain embodiments, display screen 100 includes cathode composite layer 10 of the above-described embodiments. As such, the cathode composite layer 10 of the display panel 100 has better bending resistance.

Referring to FIG. 4, in some embodiments, the display screen 100 includes an anode layer 20 and a light emitting layer 30 formed on the anode layer 20. The cathode composite layer 10 is formed on the light emitting layer 30.

Specifically, the display screen 100 may be an LCD (Liquid Crystal Display) or a flexible display screen, and the flexible display screen may be a display screen such as an AM-OLED (Active-Matrix Organic Light Emitting Diode).

Referring to FIG. 5 and FIG. 6, in some embodiments, step S14 includes:

Step S141: forming a second cathode layer 14 on the grid-like support;

Step S142: on the second cathode layer 14, the gap between the second cathode layer 14, and the gap between the supports Glue

Step S143: removing the support to form a second cathode layer 14 with a colloid;

Step S144: disposing the second cathode layer 14 with the colloid on the first cathode layer 12;

Step S145: removing the colloid.

Thus, it is easy to process and manufacture, and is advantageous for the stability of the structure of the second cathode layer 14.

In some embodiments, step S145 removes the colloid by orthogonal photolithography. Thus, the process of removing the colloid does not affect the organic matter and the metal, and thus does not damage the above display substrate having the display material and the first cathode layer 12. The display material is, for example, an OLED material.

In some embodiments, the grid-like support can be a grid-like copper foil.

Referring to Figures 1 and 7, in some embodiments, the second cathode layer 14 is honeycomb shaped. The honeycomb includes a plurality of meshes 142. The third cathode layer 16 includes a cathode portion 162 that fills the mesh 142.

As such, the first cathode layer 12 and the third cathode layer 16 form a saw wheel engagement structure through the honeycomb second cathode layer 14 to better cope with the stress shock when the display screen 100 is bent. The filling of the mesh 142 by the cathode portion 162 stabilizes the structure of the cathode composite layer 10.

In one example, the mesh 142 is a regular polygon, such as a regular hexagon. A plurality of meshes 142 are arranged neatly.

In some embodiments, the cathode portion 162 is coupled to the first cathode layer 12.

Thus, the cathode portion 162 can protect the surface of the first cathode layer 12 and function to isolate water oxygen.

In certain embodiments, the first conductive film comprises graphene.

Specifically, the graphene material has the advantages of high strength, good flexibility, good electrical conductivity, small thickness, and stable structure. When the second cathode layer 14 is formed of a graphene material, the thickness of the cathode composite layer 10 as a whole can be made small, and the bending resistance is good. Moreover, when the display screen 100 is bent, even if the first cathode layer 12 or the third cathode layer 16 is broken, it can be bridged by graphene having good conductivity, and the electrical properties of the display screen 100 can be maintained well, and thus There is a phenomenon in which the color unevenness occurs due to uneven potential distribution of the cathode composite layer 10.

Referring to FIG. 8 , in some embodiments, the area of the third cathode layer 16 is larger than the area of the second cathode layer 14 , and the area of the second cathode layer 14 is larger than the area of the first cathode layer 12 .

It can be understood that, in order to enlarge the use area of the display screen 100 and facilitate user operation, the display screen 100 is generally bent inwardly, that is, bent along the third cathode layer 16 toward the first cathode layer 12, and the third cathode layer 16 The successive reduction in the area of the second cathode layer 14 and the first cathode layer 12 ensures that the stress at each point of the cathode composite layer 10 is dispersed in all directions when the display screen 100 is bent, so that uneven edge color unevenness does not occur.

Of course, in other embodiments, the area of the third cathode layer 16 may be smaller than the area of the second cathode layer 14, and the area of the second cathode layer 14 may be smaller than the area of the first cathode layer 12. Thus, the display screen 100 is easily bent outward, that is, bent along the first cathode layer 12 toward the third cathode layer 16.

With continued reference to FIG. 8, in some embodiments, display screen 100 includes display area 50 having an area greater than the area of display area 50.

In this way, it can be ensured that each point in the display area 50 can be effectively displayed.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples", etc. Particular features, structures, materials or features described in the manner or examples are included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a particular logical function or process. And the scope of the preferred embodiments of the invention includes additional implementations, in which the functions may be performed in a substantially simultaneous manner or in an opposite order depending on the functions involved, in the order shown or discussed. It will be understood by those skilled in the art to which the embodiments of the present invention pertain.

The logic and/or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer readable medium, Used in conjunction with, or in conjunction with, an instruction execution system, apparatus, or device (eg, a computer-based system, a system including a processing module, or other system that can fetch instructions and execute instructions from an instruction execution system, apparatus, or device) Or use with equipment. For the purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with the instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections (control methods) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM). In addition, the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.

It should be understood that portions of the embodiments of the invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuit with a dedicated set of suitable combinational logic gates Into a circuit, programmable gate array (PGA), field programmable gate array (FPGA) and so on.

One of ordinary skill in the art can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.

The above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. Implementations are subject to change, modification, substitution, and variation.

Claims

A cathode composite layer for a display screen, characterized in that the cathode composite layer comprises:

a first cathode layer formed of a metal having a low work function;

a second cathode layer disposed on the first cathode layer, the second cathode layer being made of a first conductive film having ductility;

a third cathode layer disposed on the second cathode layer, the third cathode layer being made of a transparent second conductive film, the first cathode layer, the second cathode layer, and the third cathode The layers form a saw wheel engagement structure.
The cathode composite layer according to claim 1, wherein said second cathode layer has a honeycomb shape, said honeycomb shape comprises a plurality of meshes, and said third cathode layer comprises a cathode portion filling said mesh holes. .
The cathode composite layer according to claim 2, wherein said cathode portion is connected to said first cathode layer.
The cathode composite layer according to claim 1, wherein said first conductive film comprises graphene.
The cathode composite layer according to claim 1, wherein an area of said third cathode layer is larger than an area of said second cathode layer, and an area of said second cathode layer is larger than an area of said first cathode layer .
The cathode composite layer according to claim 1, wherein an area of said third cathode layer is smaller than an area of said second cathode layer, and an area of said second cathode layer is smaller than an area of said first cathode layer .
A display screen comprising the cathode composite layer of claim 1.
The display screen of claim 7 wherein said display screen comprises:

Anode layer; and

A light emitting layer disposed on the anode layer, the cathode composite layer being disposed on the light emitting layer.
The display screen according to claim 7, wherein said second cathode layer is in the form of a honeycomb, said honeycomb comprises a plurality of meshes, and said third cathode layer comprises a cathode portion filling said mesh.
The display screen according to claim 9, wherein said cathode portion is connected to said first cathode layer.
The display screen according to claim 7, wherein said first conductive film comprises graphene.
The display screen according to claim 7, wherein an area of said third cathode layer is larger than an area of said second cathode layer, and an area of said second cathode layer is larger than an area of said first cathode layer.
The display screen according to claim 7, wherein an area of said third cathode layer is smaller than an area of said second cathode layer, and an area of said second cathode layer is smaller than an area of said first cathode layer.
A display screen according to claim 12, wherein said display screen comprises a display area, said first cathode layer having an area larger than an area of said display area.
A manufacturing method for manufacturing a cathode composite layer, characterized in that the manufacturing method comprises:

Providing a first cathode layer, the first cathode layer being a metal having a low work function;

Forming a second cathode layer on the first cathode layer, the second cathode layer being made of a first conductive film having ductility; and

Forming a third cathode layer on the second cathode layer, the third cathode layer being made of a transparent second conductive film, the first cathode layer, the second cathode layer, and the third cathode layer Forming a saw wheel bite structure.
The method of manufacturing according to claim 15, wherein said forming a second cathode layer on said first cathode layer comprises:

Forming the second cathode layer on the grid-like support;

Applying glue on the second cathode layer, the gap between the second cathode layers, and the gap between the supports;

Removing the support to form the second cathode layer with a colloid;

Locating the second cathode layer with the colloid on the first cathode layer; and

The colloid is removed.
The manufacturing method according to claim 15, wherein said second cathode layer is in a honeycomb shape, said honeycomb shape comprises a plurality of meshes, and said third cathode layer comprises a cathode portion filling said mesh holes.
The manufacturing method according to claim 17, wherein said cathode portion is connected to said first cathode Floor.
The manufacturing method according to claim 15 or 16, wherein the first conductive film comprises graphene.
The method according to claim 15, wherein an area of said third cathode layer is larger than an area of said second cathode layer, and an area of said second cathode layer is larger than an area of said first cathode layer.
The method according to claim 15, wherein an area of said third cathode layer is smaller than an area of said second cathode layer, and an area of said second cathode layer is smaller than an area of said first cathode layer.