CN212782501U

CN212782501U - Flexible display screen and electronic device

Info

Publication number: CN212782501U
Application number: CN202020643077.1U
Authority: CN
Inventors: 胡康军
Original assignee: Shenzhen Royole Display Technology Co ltd
Current assignee: Shenzhen Royole Display Technology Co ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2021-03-23
Anticipated expiration: 2030-04-22

Abstract

The application relates to a flexible display screen, including display module assembly, elastic buffer layer and the support piece that stacks gradually. The support piece comprises a first surface and a second surface which are arranged oppositely, and the display module comprises a main body part covering the first surface, an extending part extending out of the support piece, and a bending part connected between the main body part and the extending part. The elastic buffer layer comprises a connecting area clamped between the display module and the supporting piece, a buffer area corresponding to the bending part and a fixing area corresponding to the extending part. And one side of the buffer area, which is deviated from the bending part, is also provided with a slot for reducing the stress generated when the bending area is bent, and protecting the display module from the bad phenomenon of dead bending caused by over-small bending radius. The application also relates to an electronic device provided with the flexible display screen.

Description

Flexible display screen and electronic device

Technical Field

The application relates to the field of electronic products, in particular to a flexible display screen and an electronic device with the flexible display screen.

Background

With the popularization of full-face screens in electronic products, the frame-variable width of display devices needs to be made narrower and narrower, and a structure that a peripheral frame circuit area is bent to the back of a middle frame to reduce the size of the frame appears. However, the peripheral frame circuit area of the display device is affected by the material, and the display device is prone to fail due to dead folding caused by too small bending radius in the manufacturing process.

SUMMERY OF THE UTILITY MODEL

The application provides a flexible display screen of configuration optimization, can realize littleer radius of buckling and guarantee that flexible display screen normal operation. The application comprises the following technical scheme:

a flexible display screen comprises a display module, an elastic buffer layer and a support piece which are sequentially stacked, wherein the support piece comprises a first surface and a second surface which are oppositely arranged;

the display module comprises a main body part covering the first surface of the supporting part, an extending part extending out of the supporting part, and a bending part used for connecting the main body part and the extending part;

the elastic buffer layer comprises a connecting area clamped between the display module and the supporting piece, a buffer area arranged corresponding to the bending part of the display module, and a fixing area arranged corresponding to the extending part of the display module; and one side of the buffer area of the elastic buffer layer, which deviates from the display module, is provided with a slot for reducing the bending stress when the display module is bent.

The connecting area of the elastic buffer layer completely or partially covers the main body part of the display module, the fixing area of the elastic buffer layer completely or partially covers the extending part of the display module, and the buffer area of the elastic buffer layer completely covers the bending part of the display module.

On the section of the main body part of the display module pointing to the direction of the extension part, the shape of the groove is one or a combination of more of a rectangle, a trapezoid, an arc, a wave or a sawtooth.

The connecting area and the fixing area of the elastic buffer layer are provided with first thicknesses, the thinnest part of the groove of the buffer area is provided with second thicknesses, and the second thicknesses are larger than or equal to half of the first thicknesses and smaller than the first thicknesses.

Wherein the elasticity of the connecting region and the fixing region of the elastic buffer layer is greater than the elasticity of the buffer region of the elastic buffer layer.

And one surface of the buffer area of the elastic buffer layer, which deviates from the display module, is provided with reinforcing glue or a reinforcing sheet.

The material of the elastic buffer layer comprises one or more of silicon rubber, polydimethylsiloxane, epoxy natural rubber, butyl rubber or polyurethane.

And a pressure sensor used for sensing the pressing operation of a user is further arranged between the supporting piece and the display module.

The application also relates to an electronic device, which comprises a shell and the flexible display screen embedded on the outer surface of the shell.

Wherein the support member comprises one or more of a support steel sheet, a liquid metal layer, an electromagnetic shielding layer or a frame body of the electronic device.

This application the flexible display screen is located through pressing from both sides the display module assembly with between the support piece elastic buffer layer does the display module assembly provides the buffering support, has improved the structural strength of display module assembly is favorable to reducing the radius of buckling of display module assembly. Meanwhile, when the display module is attached to the first surface and the second surface which are opposite to each other and are simultaneously covered on the supporting piece, the bending stress generated after the display module is bent is further reduced through the groove formed in the buffer area, so that the display module is prevented from being subjected to dead folding caused by the fact that the bending radius is too small. The electronic device provided with the flexible display screen effectively controls the thickness and size of the electronic device while realizing a narrow-frame full-screen.

Drawings

FIG. 1 is a schematic cross-sectional view of the flexible display of one embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of the flexible display screen according to an embodiment of the present application after being bent;

FIG. 3 is a schematic partial cross-sectional view of a slot in the flexible display screen of various embodiments of the present application;

FIG. 4 is a schematic cross-sectional view of the flexible display screen according to another embodiment of the present application after bending;

FIG. 5 is a schematic cross-sectional view of a flexible display screen according to yet another embodiment of the present application after bending;

fig. 6 is a schematic diagram of the electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic cross-sectional view of a flexible display 100 according to an embodiment of the present disclosure, and fig. 2 is a schematic cross-sectional view of the flexible display 100 after bending corresponding to the embodiment of fig. 1. The horizontal direction in fig. 1 is defined as the length direction of the display module 10, and the direction perpendicular to the paper is defined as the width direction of the display module 10. The flexible display screen 100 includes a display module 10, an elastic buffer layer 20, and a support member 30, which are sequentially stacked. The display module 10 and the elastic buffer layer 20 are stacked on the supporting member 30, and the elastic buffer layer 20 is sandwiched between the display module 10 and the supporting member 30. The supporting member 30 includes a first surface 301 and a second surface 302 disposed opposite to each other, and the display module 10 and the elastic buffer layer 20 are covered on the first surface 301 when being laid flat. The area of the display module 10 corresponding to the first surface 301 is a main body portion 11, and a display area is disposed on the opposite side of the main body portion 11 and the supporting member 30, so as to implement a display function. It is understood that a touch module (not shown) may be disposed between the display module 10 and the support 30 for implementing a touch function.

The display module 10 is provided with a display area defined as the front surface of the display module 10 on the side opposite to the support 30, and the back surface of the display module 10 is the side opposite to the front surface. In the following description, the surfaces facing the front surface of the display module 10 are defined as the front surface, and the surfaces facing the back surface of the display module 10 are defined as the back surface, which will not be described in detail later.

The display module 10 further includes a bending portion 12 and an extending portion 13 extending toward a direction away from the supporting member 30 relative to the main body portion 11. The bent portion 12 is connected between the main body portion 11 and the extended portion 13. In this embodiment, the main body 11, the bending portion 12 and the extending portion 13 of the display module 10 have the same width. In other embodiments, the widths of the main body 11, the bending part 12 and the extending part 13 of the display module 10 are not equal. Specifically, the width of the bent portion 12 is greater than or less than the width of the main body portion 11 and the extension portion 13.

The bent portion 12 is used for bending, and when the bent portion 12 is bent, an included angle between the main body portion 11 and the extended portion 13 is changed. The supporting member 30 further includes a side wall 303 connected between the first surface 301 and the second surface 302, when the bending portion 12 is folded, the bending portion 12 is bent to be close to the side wall 303, and the extending portion 13 gradually closes to and covers the second surface 302 of the supporting member 30. The outward bending is that after the flexible display screen 100 is bent, the display area of the display module 10 is bent outwards; the inward bending is a bending of the flexible display screen 100, in which the display area of the display module 10 is inward. In the following description, references to folding are to be understood to include both folding in and folding out, unless the context specifically indicates folding in or folding out. It is understood that the bending portion 12 and the extending portion 13 can be used as a peripheral frame line region of the display module 10 for disposing or connecting COF or FPC, etc. to drive the display region of the main body portion 11 for displaying. In other embodiments, the bending portion 12 and the extending portion 13 also include a display area. When the flexible display screen 100 is folded outwards, since the bending portion 12 and the extending portion 13 are respectively located at the position of the sidewall 303 of the supporting member 30 and the position of the second face 302, the user cannot see the bending portion 12 and the extending portion 13 when observing the flexible display screen 100 in a front direction, so that the flexible display screen 100 can achieve a narrow frame effect or a frame-free effect.

Referring to fig. 1, the elastic buffer layer 20 is configured to match the size of the display module 10, that is, the elastic buffer layer 20 covers the entire back of the main body 11, the bending portion 12 and the extending portion 13. In the remaining embodiments, the elastic buffer layer 20 partially covers the main body portion 11 and the extension portion 13, and the elastic buffer layer 20 completely covers the bending portion 12. Specifically, the elastic buffer layer 20 partially covers the main body 11 and the extension portion 13 in the length direction and/or the width direction of the display module 10, and the elastic buffer layer 20 completely covers the bending portion 12. Correspondingly, when the display module 10 is folded outward, the elastic buffer layer 20 is also attached to the first surface 301, the sidewall 303 and the second surface 302 along with the display module 10. Because the thickness of the display module 10 is thin, the flexible display screen 100 is prone to dead folding during the bending process, which results in failure of displaying. The elastic buffer layer 20 can support the display module 10, reinforce the structure of the flexible display screen 100, increase the bending radius of the flexible display screen 100, prevent the bending radius from being too small, and effectively release the concentrated stress generated by bending when bending.

Further, the position of the elastic buffer layer 20 corresponding to the bending portion 12 is defined as a buffer area 21, the portion of the elastic buffer layer 20 sandwiched between the display module 10 and the supporting member 30 is defined as a connection area 22, and the position of the elastic buffer layer 20 corresponding to the extending portion 13 is defined as a fixing area 24. The buffer area 21 needs to be bent together with the bent portion 12, so that the bending stress of the elastic buffer layer 20 is the greatest at the position of the buffer area 21. In order to reduce the overall stress concentration of the flexible display screen 100, the flexible display screen 100 of the present application is further provided with a slot 23 at the position of the buffer area 21. The slot 23 is disposed on one side of the buffer area 21 departing from the bending portion 12, the thickness of at least a partial region of the buffer area 21 is reduced due to the arrangement of the slot 23, and the extrusion in the bending process along with the bending portion 12 is correspondingly reduced, so that the bending stress is reduced, a smaller bending radius can be realized, and the phenomenon of dead folding can be avoided.

Experiments prove that under the condition that the buffer area 21 is provided with the slot 23, the minimum bending radius of the flexible display screen 100 is smaller than the minimum bending radius of the buffer area 21 without the slot 23, the thickness of the flexible display screen 100 is reduced by the structure, and the normal display function of the flexible display screen 100 can be ensured.

Referring to fig. 3, (a) - (e) in fig. 3 are partial cross-sectional views of the slot 23 in different embodiments of the present application. In a cross section of the main body 11 of the display module 10 in a direction toward the extension 13, the shape of the slot 23 may be one of a rectangle, a trapezoid, an arc, a wave or a sawtooth, or a combination of a plurality of shapes. Since the groove 23 actually reduces the thickness of the buffer area 21 to reduce the stress concentration formed after the buffer area 21 is bent, the actual shape of the groove 23 is not particularly limited in the flexible display panel 100 of the present application. The slots 23 are arranged to be rectangular, trapezoidal, arc-shaped, wavy or zigzag which is easy to manufacture, so that the process is simplified, and the manufacturing cost is saved.

In one embodiment, attachment region 22 and attachment region 24 of elastic buffer layer 20 have a first thickness d 1. The buffer area 21 has a structure at its thinnest with a second thickness d2 due to the existence of the slot 23. In order to ensure the rigidity and elastic support performance of the buffer zone 21, the second thickness d2 is greater than or equal to half of the first thickness d1 and less than the first thickness d1, i.e. d1 > d2 ≧ d 1/2.

As for the material of the elastic buffer layer 20, in some embodiments, one or more of silicone rubber, Polydimethylsiloxane (PDMS), natural rubber Epoxy (ENR), butyl rubber (IIR), or Polyurethane (PU) may be mixed. On the other hand, as mentioned above, since only the buffer area 21 is actually required to be bent in the elastic buffer layer 20, the connection area 22 and the fixation area 24 only need to be attached to the first surface 301 and the second surface 302. Therefore, the elastic buffer layer 20 can also be provided to distinguish the elastic modulus of the buffer region 21 from the elastic modulus of the connection region 22 and the fixation region 24. I.e. the connection region 22 and the fixation region 24 of the elastic buffer layer 20 are less elastic than the buffer region 21. For the buffer area 21 requiring bending, the elastic modulus thereof may be set smaller than those of the connection area 22 and the fixation area 24 not requiring bending. The adjustment of the elastic modulus of elastic buffer layer 20 to meet the requirement of being larger than the elastic modulus of buffer region 21 can be achieved by mixing the above materials in different proportions.

Please refer to fig. 4 and fig. 5, which are schematic cross-sectional views of the flexible display screen 100 after being bent according to two embodiments of the present application. The buffer area 21 is further provided with a reinforcing glue 41 or a reinforcing sheet 42 at a position corresponding to the side wall 303. The supporting rigidity to kink 12 can further be strengthened to reinforcement glue 41 or reinforcement piece 42, and cooperation buffer 21 combined action can guarantee that this application flexible display screen 100 can not appear the phenomenon of turning over soon at the in-process of buckling.

In an embodiment, the elastic buffer layer 20 may be prepared on the supporting member 30 and/or the display module 10 by coating, and the elastic buffer layer 20 may be adhered to the supporting member 30 and/or the display module 10 by glue. Depending on the manufacturing process and conditions of the flexible display 100. Generally, the surface of the supporting member 30 or the display module 10 may be pretreated with a chemical solvent such as alcohol by a coating method, so as to adjust the surface activity thereof, and then the elastic buffer layer 20 may be coated on the surface of the supporting member 30 or the display module 10. Because the rubber class material comparatively commonly used has all been selected for use to elastic buffer layer 20's material in this application, consequently elastic buffer layer 20 can be better all realize the laminating with support piece 30 and display module assembly 10.

The present application further relates to an electronic device 200 (see fig. 6), wherein the electronic device 200 includes a housing 201, and the outer surface of the housing 201 is open and embedded with the flexible display screen 100. The electronic apparatus 200 may be any device having communication and storage functions, such as: the system comprises intelligent equipment with a network function, such as a tablet Computer, a mobile phone, an electronic reader, a remote controller, a Personal Computer (PC), a notebook Computer, vehicle-mounted equipment, a network television, wearable equipment and the like. As can be appreciated, because the electronic device 200 is equipped with the flexible display screen 100 of the present application, the electronic device 200 can achieve the display effect of a full-screen, and the user experience is improved. Meanwhile, as the bending radius of the flexible display screen 100 of the present application becomes smaller, the overall thickness of the electronic device 200 is also controlled.

In one embodiment, the supporting member 30 of the flexible display screen 100 may be further configured as one or more of a supporting steel sheet of the electronic device 200, a liquid metal layer, an electromagnetic shielding layer, or a frame of the electronic device 200, so as to reduce the number of components of the electronic device 200 and improve the integration of the electronic device 200.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims

1. A flexible display screen is characterized by comprising a display module, an elastic buffer layer and a support piece which are sequentially stacked, wherein the support piece comprises a first surface and a second surface which are oppositely arranged;

the elastic buffer layer comprises a connecting area clamped between the display module and the supporting piece, a buffer area arranged corresponding to the bending part of the display module, and a fixing area arranged corresponding to the extending part of the display module;

and one side of the buffer area of the elastic buffer layer, which deviates from the display module, is provided with a slot for reducing the bending stress when the display module is bent.

2. The flexible display screen of claim 1, wherein the connection region of the elastic buffer layer completely or partially covers the main body portion of the display module, the fixing region of the elastic buffer layer completely or partially covers the extension portion of the display module, and the buffer region of the elastic buffer layer completely covers the bending portion of the display module.

3. The flexible display screen of claim 1, wherein in a cross section of the main body portion of the display module pointing to the direction of the extension portion, the shape of the slot is one or a combination of a rectangle, a trapezoid, an arc, a wave or a sawtooth.

4. The flexible display of claim 1, wherein the attachment and attachment regions of the elastic buffer layer have a first thickness, and the thinnest portion of the slot of the buffer layer has a second thickness that is greater than or equal to one-half of the first thickness and less than the first thickness.

5. The flexible display of claim 1, wherein the elastic buffer layer has a lower elasticity in the attachment and attachment regions than in the buffer region of the elastic buffer layer.

6. The flexible display screen of claim 2, wherein a surface of the buffer region of the elastic buffer layer facing away from the display module is provided with a reinforcing glue or a reinforcing sheet.

7. The flexible display of any of claims 1-6, wherein the elastic buffer layer comprises one of silicone rubber, polydimethylsiloxane, epoxy natural rubber, butyl rubber, or polyurethane.

8. The flexible display screen of claim 7, wherein a pressure sensor for sensing a pressing operation of a user is further disposed between the supporting member and the display module.

9. An electronic device, comprising a housing, and the flexible display screen according to any one of claims 1 to 8 embedded on an outer surface of the housing.

10. The electronic device of claim 9, wherein the support member comprises one or more of a sheet of supporting steel, a layer of liquid metal, an electromagnetic shielding layer, or a frame of the electronic device.