WO2020215562A1

WO2020215562A1 - Display panel and display device

Info

Publication number: WO2020215562A1
Application number: PCT/CN2019/103003
Authority: WO
Inventors: 王坤
Original assignee: 武汉华星光电半导体显示技术有限公司
Priority date: 2019-04-25
Filing date: 2019-08-28
Publication date: 2020-10-29
Also published as: CN110085641A

Abstract

Provided are a display panel and a display device. The display panel comprises: a first flexible substrate (11); and at least one anti-curl film (20) comprising a first inorganic layer (21) arranged on the first flexible substrate (11), and a second flexible substrate (22) arranged on the first inorganic layer (21), wherein a plurality of grooves (221) are provided in the second flexible substrate (22), and the grooves (221) are filled with an inorganic material to form an anti-curl portion (23). According to the display panel and the display device, the display panel can be prevented from curling.

Description

Display panel and display device

Technical field

The present invention relates to the field of display technology, in particular to a display panel and a display device.

Background technique

Flexible organic light-emitting diodes (OLED, Organic Light-Emitting Diode) displays have the advantages of simple structure, fast response speed, active light emission, low power consumption, etc., and have been widely used in display fields such as mobile phones, flat panels, and TVs. With the development of product differentiation, flexible and folding screens have become a trend.

The flexible OLED device includes a flexible substrate, a switch array layer, an organic light-emitting layer, and an encapsulation layer that are sequentially fabricated on a peel-off substrate. Since the film layer is stacked, the internal stress of the film layer is bound to exist. Depending on the deposition structure, There are positive or negative stresses, so when the flexible panel is peeled from the glass substrate, a curling phenomenon will occur, which will easily cause the internal film layer of the flexible substrate to break and cause the panel to fail.

technical problem

Technical solutions

The object of the present invention is to provide a display panel and a display device, which can prevent the display panel from curling and prevent the display panel from failing.

To solve the above technical problems, the present invention provides a display panel, which includes:

First flexible substrate;

At least one anti-curl film, which includes:

The first inorganic layer is provided on the first flexible substrate;

The second flexible substrate is arranged on the first inorganic layer, and a plurality of grooves are arranged on the second flexible substrate; the grooves are filled with inorganic materials to form an anti-curling part.

The present invention provides a display device including the above-mentioned display panel.

Beneficial effect

In the display panel and the display device of the present invention, an anti-curling film is added to the display panel, wherein the anti-curling film includes a first inorganic layer and a second flexible substrate, and the second flexible substrate is provided with a plurality of grooves; The groove is filled with inorganic material to form an anti-curling portion. Because the anti-curling portion and the first inorganic layer are provided, the two inorganic layers work together to overcome the internal stress of the display panel and prevent the display panel and the glass substrate. The phenomenon of curling occurs after peeling, to avoid failure of the display panel.

Description of the drawings

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

FIG. 2 is a schematic structural view of the first step of the manufacturing method of the anti-curl film in FIG. 1;

3 is a schematic structural view of the second step of the manufacturing method of the anti-curl film in FIG. 1;

4 is a schematic structural view of the third step of the manufacturing method of the anti-curl film in FIG. 1;

Figure 5 is a first plan view of the anti-curling part of the present invention;

Figure 6 is a second top view of the anti-curling portion of the present invention;

Figure 7 is a third plan view of the anti-curling part of the present invention;

Figure 8 is a fourth top view of the anti-curling portion of the present invention;

FIG. 9 is a schematic diagram of the structure of the display panel according to the second embodiment of the present invention.

The best mode of the invention

The description of the following embodiments refers to the attached drawings to illustrate specific embodiments that the present invention can be implemented. The directional terms mentioned in the present invention, such as "up", "down", "front", "rear", "left", "right", "in", "out", "side", etc., are for reference only The direction of the additional schema. Therefore, the directional terms used are used to describe and understand the present invention, rather than to limit the present invention. In the figure, units with similar structures are indicated by the same reference numerals.

Please refer to FIGS. 1 to 8. FIG. 1 is a schematic structural diagram of a display panel according to the first embodiment of the present invention.

As shown in FIG. 1, the display panel of the present invention includes a first flexible substrate 11 and an anti-curling film 20.

The first flexible substrate 11 is located on the glass substrate 10, the material of the first flexible substrate 11 is PI, and the thickness of the first flexible substrate 11 may range from 1 μm to 10 μm.

The anti-curling film 20 includes a first inorganic layer 21, a second flexible substrate 22 and a plurality of anti-curling parts 23, and the first inorganic layer 21 is provided on the first flexible substrate 11. The material of the first inorganic layer 21 may include at least one of SiNx, SiOxNy, SiOx, SiCxNy, ZnO, and AlOx. In order to reduce the overall thickness of the display panel while preventing curling, the thickness of the first inorganic layer 21 ranges from 0.5 μm to 5 μm.

The second flexible substrate 22 is provided on the first inorganic layer 21, wherein the thickness of the first flexible substrate 11 and the thickness of the second flexible substrate 21 may be equal. The thickness of the second flexible substrate 22 may range from 1 μm to 10 μm.

With reference to FIG. 2, the second flexible substrate 22 is provided with a plurality of grooves 221, and an inorganic material is filled in the grooves 221 to form an anti-curling portion 23. Specifically, during the manufacturing process, the groove 221 is formed by embossing or laser etching.

In order to further prevent the display panel from curling, two adjacent grooves 221 are arranged at intervals, and the distance between two adjacent grooves 221 is within a preset range. Wherein, the difference between the distance between two adjacent grooves 221 and the width of the groove 221 is less than or equal to a preset value. The preset value is, for example, 0, that is, the closer the groove pitch is to the groove width, the less likely it is to curl.

That is, the anti-crimp portion 23 is disposed in the groove 221 and matches the size of the groove 221. Each groove 221 corresponds to an anti-curling portion 23, and the material of the anti-curling portion 23 is an inorganic material. The material of the anti-curling portion 23 includes at least one of SiNx, SiOxNy, SiOx, SiCxNy, ZnO, and AlOx.

In order to further improve the anti-curling effect, during the manufacturing process, as shown in FIG. 3, one of PECVD, ALD, PLD, sputter and other methods is used to deposit in the groove 221 and on the second flexible substrate 22 Inorganic material 23' to form an inorganic film 23'. Then, the photoresist material 24 is coated on the position corresponding to the groove 221. After that, as shown in FIG. 4, the inorganic film on the second flexible substrate 22 is etched away, leaving only the inorganic film filled in the groove 221 to obtain an anti-curling portion 23, which will then be located on the anti-curling portion 23 The photoresist material 24 is peeled off. In one embodiment, in order to improve the display effect and facilitate subsequent manufacturing processes, the upper surface of the anti-curling portion 23 and the upper surface of the second flexible substrate 22 are flush. Of course, the interface can be flattened by controlling the etching parameters.

In order to facilitate the deposition of the inorganic film, the width of the groove 221 may be greater than a preset width. The preset width can be set according to empirical values.

As shown in FIGS. 5 to 8, the top-view shape of the anti-curl portion 23 may be rectangular, hexagonal, circular, etc., of course, it is not limited to the above shapes, and may also be other shapes, such as ellipse, trapezoid, etc. The shape of the anti-curling portion 23 matches the shape of the groove 221. In FIG. 5, the anti-curling parts 23 are arranged parallel to each other, and the number of the anti-curling parts 23 is small. In FIGS. 6 to 8, the number of anti-curling parts 23 is relatively large, and the number of grooves is also relatively large at this time, so that the anti-curling parts are distributed more dispersedly, the stress can be better distributed, and the curling can be further prevented. Some of the anti-curling parts 23 in FIGS. 6 and 7 are arranged in parallel, and the number of the anti-curling parts 23 is large, so that the anti-curling parts are distributed more dispersedly, the stress can be better dispersed, and the curling can be better prevented. . Further, in FIG. 8, two adjacent anti-curling parts 23 are arranged in a staggered manner, that is, each of the anti-curling parts 23 is arranged irregularly. It can be understood that correspondingly, two adjacent grooves 221 are also staggered, so that the distribution of the anti-crimping portion is more dispersed, which is more conducive to stress dispersion, and can further prevent curling.

In addition, since the number of grooves is consistent with the number of curl prevention parts. Therefore, when the number of the grooves is within the set range (which can be set according to empirical values), the curl preventing parts are distributed more dispersedly, the stress can be better dispersed, and curling can be further prevented.

Of course, it can be understood that the display panel may further include a switch array layer, an organic light-emitting display layer, and a thin film encapsulation layer (not shown in the figure) which are sequentially arranged on the anti-curl film 20. The switch array layer includes a plurality of thin film transistors, and its cross-sectional structure includes a buffer layer, a semiconductor layer, a gate insulating layer, a gate, a first insulating layer, a metal part, a second insulating layer, a second metal layer, and a third insulating layer. . The second metal layer includes a source electrode and a drain electrode. The organic light emitting display layer includes an anode, an organic light emitting layer, and a cathode. The material of the anode may be a metal material. The anode is connected to the drain of the thin film transistor. In a plan view, the organic light-emitting layer includes a red light-emitting layer, a green light-emitting layer, a blue light-emitting layer, and the like. The cathode is located on the organic light-emitting layer.

Due to the addition of the anti-curl film, the two inorganic layers of the anti-curl part and the first inorganic layer overcome the internal stress of the display panel and prevent the display panel from being curled after peeling off the glass substrate. In addition, since the anti-curling parts are not continuously arranged, the curling phenomenon can be effectively prevented.

Please refer to FIG. 9, which is a schematic structural diagram of a display panel according to the second embodiment of the present invention.

The difference between the display panel of this embodiment and the previous embodiment is that the display panel of this embodiment includes two layers of anti-curl films 20.

Of course, it is understandable that the number of anti-curl films 20 can be two or more.

Since more anti-curl films are provided, the internal stress of the display panel can be better dispersed, and the phenomenon of curling after the display panel is peeled from the glass substrate can be prevented.

The present invention also provides a display device, which includes any of the above-mentioned display panels.

In the display panel and the display device of the present invention, an anti-curling film is added to the display panel, wherein the anti-curling film includes a first inorganic layer and a second flexible substrate, and the second flexible substrate is provided with a plurality of grooves; The groove is filled with inorganic material to form an anti-curling portion. Because the anti-curling portion and the first inorganic layer are provided, the two inorganic layers work together to overcome the internal stress of the display panel and prevent the display panel and the glass substrate. After peeling, curling occurs to prevent the display panel from failing.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

A display panel, which includes:

First flexible substrate;

At least one anti-curl film, which includes:

The first inorganic layer is provided on the first flexible substrate;

The second flexible substrate is arranged on the first inorganic layer; the second flexible substrate is provided with a plurality of grooves, and the grooves are filled with inorganic materials to form anti-curling parts, two adjacent ones The grooves are staggered, and the width of the grooves is greater than the preset width.
A display panel, which includes:

First flexible substrate;

At least one anti-curl film, which includes:

The first inorganic layer is provided on the first flexible substrate;

The second flexible substrate is arranged on the first inorganic layer; a plurality of grooves are arranged on the second flexible substrate, and the grooves are filled with inorganic materials to form an anti-curling part.
The display panel according to claim 2, wherein:

Two adjacent grooves are staggered.
The display panel according to claim 2, wherein:

The width of the groove is greater than the preset width.
The display panel according to claim 2, wherein:

Two adjacent grooves are arranged at intervals, and the distance between two adjacent grooves is within a preset range.
The display panel of claim 5, wherein:

The difference between the distance between two adjacent grooves and the width of the grooves is less than or equal to a preset value.
The display panel according to claim 2, wherein:

The number of the grooves is within the set range.
The display panel according to claim 2, wherein:

The upper surface of the anti-curling portion is flush with the upper surface of the second flexible substrate.
The display panel according to claim 2, wherein:

The material of the anti-curling part includes at least one of SiNx, SiOxNy, SiOx, SiCxNy, ZnO, and AlOx.
The display panel according to claim 2, wherein:

The thickness of the second flexible substrate ranges from 1 μm to 10 μm.
A display device, including a display panel, the display panel including:

First flexible substrate;

At least one anti-curl film, which includes:

The first inorganic layer is provided on the first flexible substrate;

The second flexible substrate is arranged on the first inorganic layer; a plurality of grooves are arranged on the second flexible substrate, and the grooves are filled with inorganic materials to form an anti-curling part.
The display device according to claim 11, wherein:

Two adjacent grooves are staggered.
The display device according to claim 11, wherein:

The width of the groove is greater than the preset width.
The display device according to claim 11, wherein:

Two adjacent grooves are arranged at intervals, and the distance between two adjacent grooves is within a preset range.
The display device according to claim 14, wherein:

The difference between the distance between two adjacent grooves and the width of the groove is less than or equal to a preset value.
The display device according to claim 11, wherein:

The number of the grooves is within the set range.
The display device according to claim 11, wherein:

The upper surface of the anti-curling portion is flush with the upper surface of the second flexible substrate.
The display device according to claim 11, wherein:

The material of the anti-curling part includes at least one of SiNx, SiOxNy, SiOx, SiCxNy, ZnO, and AlOx.
The display device according to claim 11, wherein:

The thickness of the second flexible substrate ranges from 1 μm to 10 μm.