CN114170915A

CN114170915A - Flexible display panel

Info

Publication number: CN114170915A
Application number: CN202111613121.XA
Authority: CN
Inventors: 姜刘玺
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-03-11

Abstract

The application provides a flexible display panel, it includes: the flexible panel comprises a non-bending part and a bending part, the bending part is connected with the non-bending part, and the flexible panel is provided with an outer surface and an inner surface opposite to the outer surface; at least one back plate supporting structure arranged on the inner surface and positioned on the non-bending part; and the bending stopping part is positioned on the inner surface of the bending part and can bear against the end part of the back plate supporting structure close to the bending part.

Description

Flexible display panel

Technical Field

The application relates to the technical field of display, in particular to a flexible display panel.

Background

With the development of flexible display technology, flexible display screens have become the development trend of future display terminals. In order to achieve the full-screen display effect of the flexible display screen, the flexible display screen is usually implemented by bending the non-display portion, that is: the non-display part of the flexible display screen is bent to the back of the flexible display screen, so that the width of a frame of the screen body is reduced, and the screen occupation ratio is further improved.

However, due to the thin and soft characteristics of the flexible display screen, if the bending pressure is not uniform when the flexible display screen is bent, the problems that the screen body of the bent portion or the circuit wiring is damaged and fails and the like are easily caused.

Therefore, the prior art has defects which need to be solved urgently.

Disclosure of Invention

The application provides a flexible display panel and a manufacturing method thereof, which can solve the problem that the damage and failure of a screen body or circuit wiring of a bent part are easily caused if the pressure of bending is uneven when the bent part is bent.

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

a flexible display panel, comprising:

the flexible panel comprises a non-bending part and a bending part, the bending part is connected with the non-bending part, and the flexible panel is provided with an outer surface and an inner surface opposite to the outer surface;

at least one back plate supporting structure arranged on the inner surface and positioned on the non-bending part; and

and the bending stopping part is positioned on the inner surface of the bending part and can bear against the end part of the back plate supporting structure close to the bending part.

In one embodiment of the present invention, the flexible display panel further includes a stress adjustment layer, the stress adjustment layer is at least located on an inner surface of the bending portion, an elastic modulus of the stress adjustment layer is smaller than an elastic modulus of the back plate support structure, and the bending stopper is located on a surface of the stress adjustment layer.

In one embodiment of the present invention, the stress adjustment layer further covers an inner surface of the non-bending portion.

In one embodiment of the present invention, the bending stopper is deformable when being pressed.

In one embodiment of the present invention, the bending stopper is integrally formed with the stress adjustment layer.

In one embodiment of the present invention, the material of the bending stop portion is the same as or different from that of the stress adjustment layer.

A flexible display panel, comprising:

the flexible panel comprises a display part, a bending part and a non-display part, wherein the bending part is connected with the display part and the non-display part, and the flexible panel is provided with an outer surface and an inner surface opposite to the outer surface;

a first backplate support structure disposed on the inner surface and located at the display portion;

a second backplane support structure disposed on the inner surface and located in the non-display portion;

a stress adjustment layer arranged between the flexible panel and the first back plate supporting structure and covering the inner surface of the bending part;

the first bending stopping part is positioned at the bending part and leans against the end part, close to the bending part, of the first back plate supporting structure; and

and the second bending stopping part is positioned at the bending part and leans against the end part, close to the bending part, of the second back plate supporting structure.

The beneficial effect of this application does: the application provides a flexible display panel, the internal surface of kink is provided with the backstop portion of buckling, when buckling the kink to the dorsal part of flexible panel display portion, the backstop portion of buckling can bear and lean on backplate bearing structure is close to the tip of kink has avoided the uneven excessive bending that leads to the kink of the dynamics of buckling to the kink to lead to the problem that kink screen body or circuit wiring damage became invalid easily, has promoted the yield of product.

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 flexible display panel according to a first embodiment of the present application;

fig. 2 is a flexible display panel according to a second embodiment of the present application;

fig. 3 is a state diagram of the flexible display panel of fig. 2 before being bent.

Description of the reference numerals

100. 200-a flexible display panel; 101-a display section; 102-a bending part;

1-a flexible panel; 2-a stress adjusting layer; 3-a first backplane support structure; 112-an inner surface;

110-an outer surface; 103-a non-display part; 8-a flexible circuit board;

5-a second backplane support structure; 4-a first bending stop; 6-a fixing piece;

7-a second bending stop part; 20-end; 30-a first support layer; 32-second support layer

A. C-position of step difference.

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 "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," and the like are used in the orientation or positional relationship indicated in the drawings, which are based on the orientation or positional relationship shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered 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.

The present application may repeat reference numerals and/or letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed.

The flexible display panel 100 of the present application will be described in detail with reference to specific embodiments.

Referring to fig. 1, fig. 1 is a flexible display panel 100 according to a first embodiment of the present application, including: the flexible back plate comprises a flexible panel 1, a stress adjusting layer 2, a first back plate supporting structure 3, a first bending stopping part 4, a second back plate supporting structure 5 and a fixing part 6.

The flexible panel 1 includes a display portion 101, a bending portion 102 and a non-display portion 103. The bending portion 102 connects the display portion 101 and the non-display portion 103. The non-display portion 103 is provided with a flexible circuit board 8 on a surface facing away from the display portion 101. The bent portion 102 is substantially semicircular. Of course, in other embodiments, the bending portion 102 may have a semicircular shape or a semicircular shape. The shape of the bent portion 102 is not limited in the present application. The shape of the bending portion 102 is generally determined by the length of the bending portion 102, the thickness of the flexible display device to which the flexible display panel 100 is applied, and the material characteristics of the flexible display panel 100.

The flexible panel 1 has an outer surface 110 and an inner surface 112 opposite to the outer surface 110. In addition, the display portion 101 and the non-display portion 103 can be referred to as a non-bending portion. The display portion 101 may include a plurality of light emitting devices, such as LED light emitting devices, OLED light emitting devices, and the like. The bending part 102 may include a plurality of traces connecting the plurality of light emitting devices.

The stress adjustment layer 2 is at least disposed on the inner surface 112 of the bending portion 102 of the flexible panel 1. In this embodiment, the stress adjustment layer 2 further covers the display portion 101 and the non-display portion 103, that is, the stress adjustment layer 2 has a layer structure having the same size as the flexible panel 1, the stress adjustment layer 2 is disposed on the entire inner surface 112 of the flexible panel 1, the stress adjustment layer 2 on the display portion 101 and the non-display portion 103 is used for protecting the flexible panel 1, and the stress adjustment layer 2 has an entire layer structure, so that the manufacturing process of the flexible display panel 100 can be saved. The material of the stress adjusting layer 2 can be foam, sponge, foam or colloid with elastic glue as the main component. When a portion of the flexible panel 1 is bent to form the non-display portion 103, the stress adjustment layer 2 is of a full-face structure and is located on the inner surface 112 of the flexible panel 1, and has a smaller bending inner diameter than the bending portion 102 located on the surface thereof, so that the stress adjustment layer is used as an inner layer receptor of the bending portion 102, and can generate a small deformation to respond to the bending stress, thereby protecting the bending portion 102 and avoiding damage and failure of the screen or circuit trace of the bending portion 102 during bending.

The first back plate supporting structure 3 may be disposed on the inner surface 112 and located on the display portion 101 by fitting. The first backplane support structure 3 is attached to the inner surface 112 of the stress adjustment layer 2 facing the non-display portion 103, for example, by an adhesive (not shown). In the present embodiment, the first back plate support structure 3 includes a first support layer 30 and a second support layer 32. In this embodiment, the elastic modulus of the stress adjustment layer 2 is smaller than that of the first support layer 30, and the elastic modulus of the first support layer 30 is smaller than that of the second support layer 32. The elastic modulus can be regarded as an index for measuring the degree of difficulty of elastic deformation of a material. The larger the value, the larger the stress that causes a certain elastic deformation of the material, i.e. the greater the stiffness of the material. I.e. the less elastic deformation occurs under a certain stress. With this arrangement, the display unit 101 can be supported and protected, and the bending stress can be transmitted layer by layer, thereby reducing the stress gradually. The material of the first support layer 30 may be a resin, and specifically, the resin may be polyethylene, polystyrene, polytetrafluoroethylene, polypropylene, polycarbonate, or the like. The material of the second supporting layer 32 is metal, such as copper, stainless steel, etc.

The first bending stop portion 4 is located at the bending portion 102 and is supported by an end of the first back plate supporting structure 3 close to the bending portion 102. Because the bending stress generated on the display portion 101 side is larger than the bending stress generated on the non-display portion 103 side at the time of actual bending. Therefore, in the present embodiment, the first bending stopper 4 is located at the bending portion 102, and the stress adjustment layer 2 on the side of the display portion 101 is close to the end 20 of the bending portion 102. When the bending portion 102 is bent to the back side of the display portion 101 of the flexible panel 1, the first bending stop portion 4 can be supported by the end portion 20 of the stress adjusting layer 2 close to the bending portion 102, so as to avoid the problem that the screen or the circuit trace of the bending portion 102 is damaged and fails due to excessive bending of the bending portion 102 caused by uneven bending force to the bending portion 102. Referring to fig. 3, that is, when the flexible display panel 100 is in the unfolded state, the first bending stopping portion 4 and the end portion 20 of the first rear panel supporting structure 3 close to the bending portion 102 are disposed at an interval, and when the bending portion 102 is bent to the back side of the display portion 101, the first bending stopping portion 4 contacts the end portion 20 of the stress adjusting layer 2 close to the bending portion 102 but is not fixed to the end portion 20, so that the first bending stopping portion 4 provides a limiting and stress buffering function for the bending of the bending portion 102, and stops bending when the first bending stopping portion 4 contacts the end portion 20 of the stress adjusting layer 2 close to the bending portion 102, thereby avoiding excessive bending. In one embodiment of the present invention, the bending stop portion can deform when being pressed, so as to buffer the phenomenon of bending stress concentration.

When the stress adjustment layer 2 is foam, the first bending stopper 4 may be integrally formed with the stress adjustment layer 2. The first bending stop portion 4 and the stress adjustment layer 2 may be made of the same material. That is, the material of the first bending and blocking portion 4 may be foam.

The first bending stop portion 4 and the stress adjustment layer 2 may be made of different materials. Preferably, the stress adjustment layer 2 is foam, and the material of the first bending stopper 4 is elastic glue. An elastomeric gel is a gel that remains resilient after curing, preferably between 70% and 90%. The elastic glue can be a dimethyl silica gel layer, a methyl vinyl silica gel layer or a methyl phenyl vinyl silica gel layer and the like. The first bending stopping portion 4 may also be formed of a material that can deform to a certain extent, such as sponge or foam.

The second backplane support structure 5 is disposed on the inner surface 112 and is located in the non-display portion 103. The second backplate support structure 5 is attached to the surface of the stress adjustment layer 2 facing the display portion 101, for example, by an adhesive (not shown). It should be understood that the adhesive refers to a material that can bond two objects. The adhesive may also have a heat-curable property or a light-curable property. In the present embodiment, the second supporting structure 5 is a single-layer structure, and more specifically, the second supporting structure 5 and the first supporting layer 30 are made of the same material.

The fixing member 6 is disposed between the first backboard support structure 3 and the second backboard support structure 5 to fix the first backboard support structure 3 and the second backboard support structure 5. In this embodiment, the fixing member 6 is a double-sided tape.

Referring to fig. 2, fig. 2 is a flexible display panel 200 according to a second embodiment of the present application, the flexible display panel 200 according to the second embodiment is substantially the same as the flexible display panel 100 according to the first embodiment, except that: in this embodiment, the flexible display panel 200 further includes a second bending stop portion 7, the second bending stop portion 7 is located at the bending portion 102 and is abutted against an end portion of the second backplane supporting structure 5 close to the bending portion 102, and the second bending stop portion 7 is used for alleviating a stress concentration problem of the non-display portion 103.

Referring to fig. 3, when the flexible display panel 200 is in a flat state, an elastic adhesive is coated at a step difference position A, C by a dispensing device or other feasible devices, or a first bending stop portion 4 and a second bending stop portion 7 are respectively preset at a step difference position A, C, a gap is formed between the first bending stop portion 4 and the first backplane support structure 3, a gap is formed between the second bending stop portion 7 and the second backplane support structure 5, then the bending portion 102 of the flexible display panel 200 is bent, so that the bending is stopped when the first bending stop portion 4 contacts the end portion 20 of the first backplane support structure 3 close to the bending portion 102, and the first backplane support structure 3 and the second backplane support structure 5 are fixed by the fixing member 6, so as to obtain the flexible display panel 200.

To sum up, the

flexible display panel

100, 200 that this application provided the internal surface 112 of kink 102 is provided with the backstop portion of buckling, and when buckling kink 102 to the dorsal part of flexible panel 1 display 101, the backstop portion of buckling can lean on backplate bearing structure is close to the tip of kink 102 has avoided the uneven excessive bending that leads to kink 102 of the dynamics of buckling to kink 102 to lead to kink 102 screen body or the problem that circuit wiring damage became invalid easily, has promoted the yield of product.

In summary, although the present application has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be determined by the appended claims.

Claims

1. A flexible display panel, comprising:

2. The flexible display panel according to claim 1, further comprising a stress adjustment layer at least on an inner surface of the bending portion, wherein an elastic modulus of the stress adjustment layer is smaller than an elastic modulus of the backplane support structure, and the bending stopper is on a surface of the stress adjustment layer.

3. The flexible display panel according to claim 2, wherein the stress adjustment layer further covers an inner surface of the non-bending portion.

4. The flexible display panel of claim 2, wherein the bend stop is deformable when subjected to pressure.

5. The flexible display panel of claim 2, wherein the bend stop is integrally formed with the stress adjustment layer.

6. The flexible display panel of claim 2, wherein the bending stopper is made of a different material than the stress adjustment layer.

7. A flexible display panel, comprising:

8. The flexible display panel of claim 7, wherein the bend stop is deformable when subjected to pressure.

9. The flexible display panel of claim 7, wherein the bend stop is integrally formed with the stress adjustment layer.

10. The flexible display panel of claim 7, wherein the bending stopper and the stress adjustment layer are made of the same material or different materials.