CN111863898A

CN111863898A - Display panel

Info

Publication number: CN111863898A
Application number: CN202010697120.7A
Authority: CN
Inventors: 王坤
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-10-30

Abstract

The invention provides a display panel, which comprises a substrate, a first inorganic layer, a second inorganic layer and an organic layer which are arranged in a laminated manner. The substrate comprises a plurality of first grooves, and the first grooves are arranged at the edge area of the substrate. The first inorganic layer is disposed on the substrate, includes a plurality of second grooves, and extends into the plurality of first grooves. The second inorganic layer is disposed on the first inorganic layer, includes a plurality of third grooves, and extends into the plurality of second grooves. The organic layer is disposed on the second inorganic layer and extends to the third groove.

Description

Display panel

Technical Field

The application relates to the technical field of display panels, in particular to a structure for preventing a film layer of a display panel from being peeled off.

Background

The Organic Light-emitting Diode (OLED) display panel has the advantages of simple structure, fast response speed, active Light emission, low power consumption, and the like. The OLED display panel has been widely used in the display fields of mobile phones, flat panels, televisions, and the like. With the development of product differentiation, flexible and foldable screens have become a trend.

In the production process of the flexible OLED display panel, a glass substrate is not used, but a flexible organic material, such as Polyimide (PI), is used as the substrate, so that the flexible OLED display panel has flexible and foldable performance. However, when the flexible OLED display panel was subjected to a high-temperature high-humidity storage test, it was found that the flexible OLED edge was warped in a wave-like manner after the test for a certain period of time.

Therefore, there is a need for an improved film structure of a flexible OLED display panel to prevent the problems of edge warpage and film peeling that may occur after a period of use of the flexible OLED display panel.

Disclosure of Invention

To solve the above problems, the present invention provides a display panel including: the substrate comprises a plurality of first grooves, and the first grooves are arranged at the edge area of the substrate; a first inorganic layer disposed on the substrate, the first inorganic layer including a plurality of second grooves and extending into the plurality of first grooves; a second inorganic layer disposed on the first inorganic layer, the second inorganic layer including a plurality of third grooves and extending into the plurality of second grooves; and an organic layer disposed on the second inorganic layer and extending to the third groove.

In the display panel of the present invention, the first inorganic layer further includes a buffer layer and a silicon-based layer; the second inorganic layer also comprises a metal wiring layer and an interlayer dielectric layer; and the organic layer further includes a planarization layer and a pixel defining layer.

In the display panel of the present invention, the planarization layer in the organic layer covers the second inorganic layer and fills the plurality of third grooves of the second inorganic layer; and one side of the planarization layer opposite to the second inorganic layer is a flat surface.

In the display panel of the invention, each second groove is arranged corresponding to each first groove, and each third groove is arranged corresponding to each second groove.

In the display panel of the present invention, the width of each of the plurality of first grooves is greater than the width of each of the plurality of second grooves; and the width of each second groove is larger than that of each third groove.

In the display panel of the present invention, the depth of each of the plurality of first grooves is smaller than the width of each of the plurality of first grooves; the depth of each second groove is smaller than the width of each second groove; and the depth of each of the plurality of third grooves is smaller than the width of each of the plurality of third grooves.

In the display panel of the present invention, the edge region is a region from the peripheral edge of the substrate to the center of the substrate by 10 mm.

In the display panel of the present invention, the plurality of first grooves are formed on the substrate by imprinting or laser etching.

In an embodiment of the display panel, each of the plurality of first grooves has a ring shape surrounding the edge region, and are spaced apart from each other in the edge region.

In another embodiment of the display panel according to the invention, each of the plurality of first grooves has a rectangular shape, a polygonal shape, a circular shape, or an elliptical shape, and is disposed around the edge region in the edge region at intervals.

According to the display panel, due to the design that the plurality of first grooves of the substrate, the plurality of second grooves of the first inorganic layer and the plurality of third grooves of the second inorganic layer are embedded layer by layer, the adhesion force among the film layers is improved, and the problems of edge warping and film layer peeling which may occur after the display panel is used for a period of time are effectively prevented.

Drawings

Fig. 1 is a schematic structural diagram of a display panel according to the present invention.

Fig. 2 is a schematic top view of a substrate according to an embodiment of the invention.

Fig. 3 is a schematic top view of the substrate according to another embodiment of the invention.

Fig. 4 is a schematic top view of the substrate according to another embodiment of the invention.

Detailed Description

The features and spirit of the present invention will be more clearly described in the following detailed description of the embodiments, which is not intended to limit the scope of the present invention by the embodiments disclosed. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the claims appended hereto.

Referring to fig. 1, the present invention provides a display panel including a substrate 100, a first inorganic layer 200, a second inorganic layer 300, and an organic layer 400 stacked on each other. And the display panel is mainly formed by laminating the following steps.

Step 1, providing the substrate 100. Generally, the material of the substrate 100 is preferably Polyimide (PI) as a base material of the display panel, and is prepared on a glass substrate for subsequent processes. Since the substrate 100 is made of a flexible material, it can provide the flexibility required by the display panel.

Step 2, forming a plurality of first grooves 110 on the substrate 100 by stamping or laser etching. The plurality of first grooves 110 are formed in an edge region 120 of the substrate 100. The boundary of the edge region 120 is indicated in fig. 1 by a dashed line. The edge region 120 is a non-display region of the display panel, and is mainly a region from the periphery of the substrate 100 to the center of the substrate 100 by 10 mm.

Fig. 2 is a schematic top view of the substrate 100 according to an embodiment of the invention. The shape of the plurality of first grooves 110 in the edge region 120 may include a circular array as shown in fig. 2. Each of the plurality of first grooves 110 has a ring shape surrounding the edge region 120 and is arranged in an array in the edge region 120. The shape of the ring is mainly adapted to the shape of the edge region 120 of the substrate 100. In this embodiment, the ring shape is a square frame shape surrounding the edge region 120, and the square frames of each of the plurality of first grooves are arranged in an array from outside to inside and from large to small.

In addition, fig. 3 is a schematic top view of the substrate 100 according to another embodiment of the invention. The shape of the plurality of first grooves 110 in the edge region 120 may include an array pattern as shown in fig. 3. Each of the plurality of first grooves 110 has a circular shape and is arranged in an array in the edge region 120. In this embodiment, each of the plurality of first grooves 110 is arranged in an array according to the shape of the edge region 120. Each of the plurality of first grooves 110 follows the box shape of the edge region 120 and is arranged end to end at fixed intervals around the edge region 120.

In addition, fig. 4 is a schematic top view of the substrate 100 according to another embodiment of the invention. The shape of the plurality of first grooves 110 in the edge region 120 may include an array pattern as shown in fig. 4. Each of the plurality of first grooves 110 has a rectangular shape and is arranged in an array in the edge region 120. In this embodiment, each of the plurality of first grooves 110 is arranged in an array according to the shape of the edge region 120. Each of the plurality of first grooves 110 follows the box shape of the edge region 120 and is arranged end to end at fixed intervals around the edge region 120.

In the above embodiment, the shape of each of the plurality of first grooves 110 may be a simple ring shape, or may be an independent shape, for example: rectangular, polygonal, circular, or elliptical. The plurality of first grooves 110 arrayed and spaced apart from each other can avoid the problem that the edge region 120 of the substrate 100 is too weak. The design of the first grooves 110 can be adjusted according to actual production requirements, and the actual implementation is not limited by the invention.

When the imprinting or the laser etching is performed on the substrate 100 to form each of the plurality of first grooves 110, a depth of each of the plurality of first grooves 110 is smaller than a width of each of the plurality of first grooves 110. Therefore, the subsequent deposition film-forming process of the display panel is facilitated.

Step 3, after forming the plurality of first grooves 110 on the substrate 100, depositing a layer of the first inorganic layer 200. During the deposition of the first inorganic layer 200, the first inorganic layer 200 covers the substrate 100 and extends to the plurality of first grooves 110. Therefore, as shown in fig. 1, after the first inorganic layer 200 is formed, a plurality of second grooves 210 are formed, and the second grooves 210 are disposed corresponding to the first grooves 110. The depth of each of the plurality of second grooves 210 is less than the width of each of the plurality of second grooves 210; meanwhile, the width of each of the plurality of first grooves 110 is greater than the width of each of the plurality of second grooves 210.

In addition, the first inorganic layer 200 further includes a buffer layer (not shown) and a silicon base layer (not shown) as necessary film layers of the display panel. The silicon-based layer includes silicon nitride, silicon oxide, and alpha silicon.

Step 4, after the first inorganic layer 200 is formed, a layer of the second inorganic layer 300 is then deposited. During the deposition of the second inorganic layer 300, the second inorganic layer 300 covers the first inorganic layer 200 and extends to the plurality of second grooves 210. Therefore, as shown in fig. 1, after the second inorganic layer 300 is formed, a plurality of third grooves 310 are formed, and the third grooves 310 are disposed corresponding to the second grooves 210. The depth of each of the plurality of third grooves 310 is less than the width of each of the plurality of third grooves 310; meanwhile, the width of each of the plurality of second grooves 210 is greater than the width of each of the plurality of third grooves 310.

In addition, the second inorganic layer 300 includes a metal wiring layer (not shown) and an interlayer dielectric layer (not shown) as necessary film layers of the display panel.

Step 5, after the second inorganic layer 300 is formed, a layer of the organic layer 400 is then deposited. During the deposition of the organic layer 400, a planarization layer 410 is formed. The planarization layer 410 covers the second inorganic layer 300 and extends to fill the third groove 310. The side of the planarization layer 410 opposite to the second inorganic layer 300 is a flat surface, which facilitates the formation of the pixel defining layer 420 on the planarization layer 410.

According to the display panel, due to the design that the plurality of first grooves 110 of the substrate 100, the plurality of second grooves 210 of the first inorganic layer 200 and the plurality of third grooves 310 of the second inorganic layer 300 are embedded layer by layer, the adhesion between the film layers is improved, and the problems of edge warping and film layer peeling which may occur after the display panel is used for a period of time are effectively prevented.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A display panel, comprising:

the substrate comprises a plurality of first grooves, and the first grooves are arranged at the edge area of the substrate;

a first inorganic layer disposed on the substrate, the first inorganic layer including a plurality of second grooves and extending into the plurality of first grooves;

a second inorganic layer disposed on the first inorganic layer, the second inorganic layer including a plurality of third grooves and extending into the plurality of second grooves; and

and the organic layer is arranged on the second inorganic layer and extends to the third groove.

2. The display panel according to claim 1, wherein the first inorganic layer further comprises a buffer layer and a silicon-based layer;

the second inorganic layer also comprises a metal wiring layer and an interlayer dielectric layer; and

the organic layer further includes a planarization layer and a pixel defining layer.

3. The display panel of claim 2, wherein the planarization layer in the organic layer covers the second inorganic layer and fills the plurality of third grooves of the second inorganic layer; and

one side of the planarization layer opposite to the second inorganic layer is a flat surface.

4. The display panel of claim 1, wherein each of the second grooves is disposed corresponding to each of the first grooves, and each of the third grooves is disposed corresponding to each of the second grooves.

5. The display panel of claim 1, wherein a width of each of the plurality of first grooves is greater than a width of each of the plurality of second grooves; and

the width of each of the plurality of second grooves is greater than the width of each of the plurality of third grooves.

6. The display panel of claim 1, wherein a depth of each of the plurality of first grooves is less than a width of each of the plurality of first grooves;

the depth of each second groove is smaller than the width of each second groove; and

the depth of each of the plurality of third grooves is less than the width of each of the plurality of third grooves.

7. The display panel according to claim 1, wherein the edge region is a region of the periphery of the substrate toward a center of the substrate by 10 mm.

8. The display panel of claim 1, wherein the plurality of first grooves are formed on the substrate by embossing or laser etching.

9. The display panel of claim 1, wherein each of the plurality of first grooves has a ring shape surrounding the edge region and is disposed spaced apart from each other in the edge region.

10. The display panel of claim 1, wherein each of the plurality of first grooves has a rectangular, polygonal, circular, or elliptical shape and is disposed around the edge region in the edge region at a distance from each other.