CN110600530A

CN110600530A - Display substrate and display device

Info

Publication number: CN110600530A
Application number: CN201911006195.XA
Authority: CN
Inventors: 蔡鹏�; 王洋; 杨军; 李金祥; 舒磊
Original assignee: BOE Technology Group Co Ltd; Chongqing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chongqing BOE Optoelectronics Technology Co Ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2019-12-20

Abstract

The invention provides a display substrate and a display device. The display substrate includes: the display device comprises a substrate, a display function layer arranged on the substrate, and a thin film packaging layer arranged on one side of the display function layer, which faces away from the substrate, wherein the thin film packaging layer is made of a first hydrophobic and oleophobic material. By adopting the display substrate, the packaging performance of the film packaging layer on the display function layer is improved, and the reliability and the service life of a product are favorably improved.

Description

Display substrate and display device

Technical Field

The invention belongs to the technical field of display, and particularly relates to a display substrate and a display device.

Background

For an Organic Light Emitting Diode (OLED) display substrate or a Micro-LED (Micro-LED or Mini-LED) display substrate, a thin film encapsulation layer is generally used to encapsulate a display function layer therein. The thin film encapsulation layer is generally capable of blocking the permeation of water vapor. The packaging performance of the conventional film packaging layer needs to be further improved.

Disclosure of Invention

The invention provides a display substrate and a display device, which are used for improving the packaging performance of a display product.

According to a first aspect of the present invention, there is provided a display substrate comprising: the display device comprises a substrate, a display function layer arranged on the substrate, and a thin film packaging layer arranged on one side of the display function layer, which faces away from the substrate, wherein the thin film packaging layer is made of a first hydrophobic and oleophobic material.

Optionally, the first hydrophobic and oleophobic material comprises nanospheres grafted with a perfluoropolyether compound.

Optionally, the material of the nanospheres comprises silicon or silica.

Optionally, the material of the thin film encapsulation layer further comprises an organic matrix, the nanoparticle grafted by the perfluoropolyether compound is coated on the surface of the organic matrix opposite to the substrate, or the nanoparticle grafted by the perfluoropolyether compound is embedded in the organic matrix.

Optionally, the material of the base substrate includes any one of polyethylene terephthalate, polyimide, and silicone rubber.

Optionally, the material of the substrate base plate further comprises a second hydrophobic and oleophobic material.

Optionally, the second hydrophobic oleophobic material comprises: nanoparticles grafted with a perfluoropolyether compound.

Optionally, the display function layer includes a light emitting diode layer and a wire layer, the wire layer is located on a side of the light emitting diode layer facing the substrate, the wire layer includes a first wire, and the first wire is formed on a surface of the substrate facing the display function layer.

Optionally, the material of the first wire includes any one of carbon nanotubes, graphene, and metal nanowires.

Optionally, the display function layer includes a light emitting diode layer and a driving circuit layer, and the driving circuit layer is located on a side of the light emitting diode layer facing the substrate.

According to a second aspect of the invention, there is provided a display device comprising the display substrate of the first aspect of the invention.

Drawings

FIG. 1 is a schematic structural diagram of a display substrate according to an embodiment of the invention;

FIG. 2 is a schematic structural diagram of another display substrate according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a thin film encapsulation layer according to the present invention;

FIG. 4 is a schematic structural diagram of another thin film encapsulation layer of the present invention;

the reference signs are: 1. a substrate base plate; 2. a display functional layer; 21. a conductor layer; 22. a light emitting diode layer; 23. a driving circuit layer; 3. a thin film encapsulation layer; 31. an organic matrix; 32. and (4) nano microspheres.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

With reference to fig. 1 to 4, an embodiment of the invention provides a display substrate, including: the display device comprises a substrate base plate 1, a display function layer 2 arranged on the substrate base plate 1 and a thin film packaging layer 3 arranged on one side, back to the substrate base plate 1, of the display function layer 2, wherein the material of the thin film packaging layer 3 comprises a first hydrophobic and oleophobic material.

Namely, hydrophobic and oleophobic materials are adopted to participate in the manufacturing of the thin film encapsulation layer 3. So, not only can block that steam sees through film packaging layer 3 and gets into and show functional layer 2, can also block that the greasy dirt sees through film packaging layer 3 and gets into and show functional layer 2. Thus, the quality and the service life of the display substrate are improved.

Optionally, the first hydrophobic and oleophobic material comprises nanospheres 32 grafted with a perfluoropolyether compound. The nano-microspheres 32 are, for example, silicon nano-microspheres 32, silica microspheres, zinc oxide microspheres, titanium oxide microspheres, or the like. The nano-microspheres 32 function to improve the roughness of the thin film encapsulation layer 3, and the perfluoropolyether compound functions to reduce the surface energy of the nano-microspheres 32. Thus, both hydrophobic and oleophobic properties are achieved. The perfluoropolyether compound is non-toxic, and the perfluoropolyether compound grafted nano microspheres 32 are green and environment-friendly. Other groups capable of reducing the surface energy of the nanospheres 32 may be grafted by those skilled in the art, such as heptadecafluorodecyl methacrylate (FOEA), perfluorooctanoic acid (PFOA), perfluorooctane sulfonyl compounds (PFOS).

Optionally, the material of the thin film encapsulation layer 3 further comprises an organic matrix 31, the surface of the organic matrix 31 facing away from the substrate base plate 1 is coated with the nanoparticles 32 grafted by the perfluoropolyether compound (as shown in fig. 3), or the nanoparticles 32 grafted by the perfluoropolyether compound are embedded in the organic matrix 31 (as shown in fig. 4).

Namely, the nanospheres 32 grafted with the perfluoropolyether compound are specifically bonded to the organic thin film encapsulation layer 3 or embedded inside the organic thin film encapsulation layer 3. Both embodiments can realize the blocking of steam and greasy dirt. The material of the organic substrate 31 is, for example, a commonly used organic film encapsulating layer 3 material such as polyethylene terephthalate, cyclic olefin copolymer, or the like.

The substrate board 1 may be a hard material, such as glass. Of course, the substrate 1 may be flexible, such as polyethylene terephthalate (PET), Polyimide (PI), silicone rubber, or the like.

In order to enhance the hydrophobic and oleophobic properties of the substrate 1, a second hydrophobic and oleophobic material (specifically, the first hydrophobic and oleophobic material can be referred to) can be added into the substrate 1. For example, the nano-microspheres 32 grafted with the perfluoropolyether compound are coated on the surface of glass, the surface of silicone rubber, or are incorporated into silicone rubber, etc.

Alternatively, referring to fig. 1, the display functional layer 2 includes a light emitting diode layer 22 and a wire layer 21, the wire layer 21 is located on a side of the light emitting diode layer 22 facing the substrate 1, and the wire layer 21 includes a first wire formed on a surface of the substrate 1 facing the display functional layer 2.

A plurality of light emitting diodes, which may be organic light emitting diodes, quantum dot light emitting diodes, micro light emitting diodes, etc., are disposed in the light emitting diode layer 22. Each light emitting diode constitutes a sub-pixel. The display substrate shown in fig. 1 is passive, i.e. no driver circuit is provided in the display functional layer 2, but the individual light emitting diodes are directly connected to an external driver chip (not shown) by wires in the wire layer 21.

The wires in the wire layer 21 may be single-layer wiring, double-layer wiring, triple-layer wiring, or the like. The layer of the conductive line closest to the side of the substrate board 1 is the first conductive line. The first wire can be used for leading the driving signal of the driving chip outside to the display substrate. In some alternative embodiments, one segment of the first conductive line may also serve as a pixel electrode.

Optionally, the material of the first wire includes any one of carbon nanotubes, graphene, and metal nanowires. These types of first conductive lines may be fabricated on the base substrate 1 by chemical vapor deposition, sol-gel, phase separation, suspension coating, ink jet printing, and the like. Of course, exposure etching or 3D printing may be further adopted to obtain the corresponding pattern.

Alternatively, referring to fig. 2, the display functional layer 2 comprises a light emitting diode layer 22 and a driver circuit layer 23, the driver circuit layer 23 being located on the side of the light emitting diode layer 22 facing the substrate 1. The driver circuit layer 23 may include a pixel driver circuit and signal lines such as gate lines and data lines. The pixel driving circuit controls the brightness of the leds in the led layer 22. I.e. the display functional layer 2 may also be active.

The embodiment of the invention also provides a display device which comprises the display substrate.

The display device is any product or component with a display function, such as a light emitting diode display panel, a light emitting diode display module, a display, a mobile phone, a navigator and the like.

Due to the adoption of the display substrate, the reliability and the service life of the product are improved.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A display substrate, comprising: the display device comprises a substrate, a display function layer arranged on the substrate and a thin film packaging layer used for packaging the display function layer, and is characterized in that the material of the thin film packaging layer comprises a first hydrophobic and oleophobic material.

2. The display substrate of claim 1 wherein the first hydrophobic and oleophobic material comprises nanovesicles grafted with a perfluoropolyether compound.

3. The display substrate of claim 2, wherein the material of the nanovesicles comprises silicon or silicon dioxide.

4. The display substrate according to claim 2, wherein the material of the thin film encapsulation layer further comprises an organic matrix, the nanoparticles grafted with the perfluoropolyether compound are coated on the surface of the organic matrix facing away from the substrate, or the nanoparticles grafted with the perfluoropolyether compound are embedded in the organic matrix.

5. The display substrate according to claim 1, wherein the material of the base substrate comprises any one of polyethylene terephthalate, polyimide, and silicone rubber.

6. The display substrate of claim 5, wherein the substrate material further comprises a second hydrophobic and oleophobic material.

7. The display substrate of claim 6, wherein the second hydrophobic and oleophobic material comprises: nanoparticles grafted with a perfluoropolyether compound.

8. The display substrate of claim 1, wherein the display function layer comprises a light emitting diode layer and a wire layer, the wire layer is located on a side of the light emitting diode layer facing the substrate, and the wire layer comprises a first wire formed on a surface of the substrate facing the display function layer.

9. The display substrate according to claim 8, wherein a material of the first conductive line includes any one of a carbon nanotube, graphene, and a metal nanowire.

10. The display substrate of claim 1, wherein the display function layer comprises a light emitting diode layer and a driving circuit layer, and the driving circuit layer is located on a side of the light emitting diode layer facing the substrate.

11. A display device comprising the display substrate according to any one of claims 1 to 10.