CN119007574A

CN119007574A - Support and flexible display device

Info

Publication number: CN119007574A
Application number: CN202310580350.9A
Authority: CN
Inventors: 王浩然; 张嵩; 刘陆; 郝潇鸣; 高子涵
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2023-05-22
Filing date: 2023-05-22
Publication date: 2024-11-22
Also published as: WO2024239844A1; GB2641984A

Abstract

The embodiments of the present disclosure provide a support member and a flexible display device, which belong to the field of display technology. The support member includes a support body, and the support body has a plane area, at least one first bending area and at least one second bending area. At least one first bending area and at least one second bending area intersect to form at least one bidirectional bending area, and the bidirectional bending area has a plurality of serrated connecting lines arranged along the extension direction of the first bending area, and the extension direction of the connecting lines is the same as the extension direction of the second bending area. The area other than the bidirectional bending area in the first bending area is the first unidirectional bending area, and the first unidirectional bending area has a first opening pattern. The area other than the bidirectional bending area in the second bending area is the second unidirectional bending area, and the second unidirectional bending area has a second opening pattern. The plane area is the area on the support body other than the first bending area and the second bending area. The support member in the embodiments of the present disclosure can be folded in two directions.

Description

Support and flexible display device

Technical Field

The embodiment of the disclosure relates to the technical field of display, in particular to a support piece and a flexible display device.

Background

With the development of display technology, display devices are increasingly used, and flexible display devices are popular among them. The flexible display device has the characteristics of relatively light weight, high flexibility and the like, and can realize different application forms such as folding, curling and the like.

Currently, flexible display devices generally include a stacked support and a flexible display panel. The support piece comprises a support body, wherein the support body is provided with a plane area, at least one first bending area and at least one second bending area, the at least one first bending area and the at least one second bending area are intersected to form at least one bidirectional bending area, and the plane area is an area, except the at least one first bending area and the at least one second bending area, on the support body. The area except the two-way bending area in the first bending area is a first one-way bending area, and the first one-way bending area is provided with a first open hole pattern. The area except the two-way bending area in the second bending area is a second one-way bending area, and the second one-way bending area is provided with a second open hole pattern. The bi-directional bending region is provided with a plurality of open pore regions.

Disclosure of Invention

The present disclosure provides a support and a flexible display device that can enable the support to be folded in two directions. The technical scheme is as follows:

In one aspect, a support is provided that includes a support body having a planar region, at least one first inflection region, and at least one second inflection region; the support body comprises a plurality of connecting lines positioned in the bidirectional bending areas, the connecting lines are zigzag, the connecting lines are arranged along a first direction and extend along a second direction, the first direction is the extending direction of the first bending area, and the second direction is the extending direction of the second bending area; the area except the bidirectional bending area in the first bending area is a first unidirectional bending area, and a first opening pattern is arranged in the first unidirectional bending area; the area except the bidirectional bending area in the second bending area is a second unidirectional bending area, and a second opening pattern is arranged in the second unidirectional bending area; the planar area is an area of the support body other than the at least one first inflection region and the at least one second inflection region.

Optionally, the connection line includes a plurality of saw tooth structures that link to each other in proper order in the second direction, the saw tooth structure satisfies:

Wherein C is the line width of the sawtooth structure, and A is the maximum dimension of the sawtooth structure in the first direction.

Optionally, the size of the sawtooth structure in the first direction is 0.5 mm-2 mm; the line width of the sawtooth structure is 0.05 mm-0.3 mm, and the opening size of the sawtooth structure is 0.05 mm-1 mm.

Optionally, the distance between two adjacent connecting lines is 0.1 mm-2 mm.

Optionally, the plurality of saw tooth structures are identical in structure and size.

Optionally, in the first direction, a distance between two adjacent connection lines near a center of the bidirectional bending region is greater than a distance between two adjacent connection lines far from the center of the bidirectional bending region.

Optionally, in the second direction, any connection line of the bidirectional bending region, a size of the sawtooth structure near the center of the bidirectional bending region in the first direction is larger than a size of the sawtooth structure far from the center of the bidirectional bending region in the first direction.

Optionally, the plurality of connection lines include adjacent first connection lines and second connection lines, the first connection lines and the second connection lines are axisymmetrically arranged about a symmetry axis, the symmetry axis is located between the first connection lines and the second connection lines, and a length direction of the symmetry axis is the second direction.

Optionally, the support body further includes at least one third connecting line located in the bidirectional bending region, the third connecting line extending along the first direction, the third connecting line connecting at least two connecting lines adjacent in the first direction.

Optionally, the third connecting line has a plurality of openings therein, and the shape of the openings includes an elongated shape, a circular shape or a diamond shape.

Optionally, any one of the plurality of connection lines comprises a plurality of first portions and a plurality of second portions alternately connected; the number of the sawtooth structures contained in the first part is smaller than the number of the sawtooth structures contained in the second part, and the size of the sawtooth structures in the first part in the first direction is larger than the size of the sawtooth structures in the second part in the first direction; a plurality of the first portions of the plurality of connection lines are arranged in the first direction and the second direction array, and a plurality of the second portions of the plurality of connection lines are arranged in the first direction and the second direction array.

Optionally, the support body includes at least two bidirectional bending regions, the bidirectional bending regions are arranged along the first direction or the second direction, and a distance between two adjacent bidirectional bending regions is greater than or equal to 2mm.

Optionally, the first hole pattern includes a plurality of first holes arranged in an array, and a length direction of the first holes is the same as the first direction; the second opening pattern comprises a plurality of second openings which are arranged in an array mode, and the length direction of the second openings is the same as the second direction.

Optionally, the first unidirectional bending region includes a first transition region located at a region of the first unidirectional bending region that is adjacent to the planar region in the second direction; the first transition region comprises a plurality of third openings, the length direction of the third openings is the first direction, the length of the third openings is smaller than that of the first openings, and the length of the third openings close to the plane region is smaller than that of the third openings far away from the plane region.

Optionally, the second unidirectional bending region includes a second transition region, and the second transition region is located in a region of the second unidirectional bending region, which is close to the planar region in the first direction; the second transition region comprises a plurality of fourth open holes, the length direction of the fourth open holes is the second direction, the length of the fourth open holes is smaller than that of the second open holes, and the length of the fourth open holes close to the plane region is smaller than that of the fourth open holes far away from the plane region.

Optionally, in the first direction, one or more rows of the second openings exist between two adjacent connecting lines.

Optionally, the thickness of the supporting body is 0.05 mm-0.3 mm.

Optionally, the supporting body is made of one of stainless steel, titanium alloy, aluminum alloy, carbon fiber composite board and glass fiber composite board.

Optionally, the support member further includes a first adhesive layer, a spacer layer, and a second adhesive layer, and the support body, the first adhesive layer, the spacer layer, and the second adhesive layer are sequentially laminated.

Optionally, the thickness of the first bonding layer is 0.005 mm-0.05 mm; the thickness of the second bonding layer is 0.005-0.05 mm; the thickness of the spacing layer is 0.005 mm-0.2 mm.

Optionally, the first bonding layer is made of acrylic pressure-sensitive adhesive or organic silicon pressure-sensitive adhesive; the second bonding layer is made of acrylic pressure-sensitive adhesive or organic silicon pressure-sensitive adhesive.

Optionally, the spacer layer is made of one of stainless steel, copper, polyimide, polyethylene terephthalate, acrylic modified foam, polyurethane modified foam and organosilicon modified foam.

In another aspect, a flexible display device is provided that includes a flexible display panel, a third adhesive layer, a cover plate, and any of the foregoing supports, the support, the flexible display panel, the third adhesive layer, and the cover plate being laminated in sequence.

The beneficial effects that this disclosure provided technical scheme brought include at least:

the two-way bending area can realize bending in two directions, and the support piece capable of being folded in two directions is obtained by arranging a plurality of connecting wires in the two-way bending area, wherein the connecting wires are in a zigzag shape.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic view of a support body according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of another support body provided in an embodiment of the present disclosure;

FIG. 3 is a schematic view of another support body provided in an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a bi-directional bending region according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of another embodiment of a bi-directional bending region according to the present disclosure;

FIG. 6 is a schematic view of another bi-directional bending region provided in an embodiment of the present disclosure;

FIG. 7 is a schematic view of another embodiment of a bi-directional bending region according to the present disclosure;

FIG. 8 is a schematic view of another support body provided in an embodiment of the present disclosure;

FIG. 9 is an enlarged view of a portion of FIG. 8;

FIG. 10 is a schematic view of another support body provided in an embodiment of the present disclosure;

FIG. 11 is an enlarged view of a portion of FIG. 10;

FIG. 12 is a schematic view of another support body provided in an embodiment of the present disclosure;

FIG. 13 is an enlarged view of a portion of FIG. 12;

FIG. 14 is a schematic view of another support body provided in an embodiment of the present disclosure;

FIG. 15 is a schematic view of another support body provided in an embodiment of the present disclosure;

FIG. 16 is a schematic view of another support body provided in an embodiment of the present disclosure;

FIG. 17 is a schematic cross-sectional view of a support provided by an embodiment of the present disclosure;

Fig. 18 is a schematic cross-sectional structure of a flexible display device according to an embodiment of the present disclosure.

Legend description:

1. Support 2, flexible display panel 3, third adhesive layer 4, cover plate

10. Support body 20, first adhesive layer 30, spacer layer 40, second adhesive layer

X, first direction y, second direction m, first bending axis n, second bending axis

13. Planar area

11. First inflection region 111, first transition region

110. First unidirectional bending region 1101, first opening 1102, and third opening

12. A second inflection region 121, a second transition region

120. Second unidirectional bending region 1201, second opening 1202, fourth opening

100. Bidirectional bending area 101, connecting wire 106 and sawtooth structure

102. First connecting section 103, second connecting section

104. Third connecting section 105, fourth connecting section

10101. First portion 10102, second portion

1011. First connection line 1012, second connection line 1013, and third connection line

10130. Opening of third connecting wire

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present disclosure more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," "third," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", "top", "bottom" and the like are used only to indicate relative positional relationships, which may be changed accordingly when the absolute position of the object to be described is changed.

In the flexible display device, through setting up support piece at flexible display panel's the back, wherein support piece includes intermediate level and the supporting body of range upon range of, and the supporting body can buckle bidirectionally, and the intermediate level is used for connecting supporting body and flexible display panel, can make flexible display device have many bending directions when improving holistic supportability, tensile ability, shock resistance of flexible display device.

Fig. 1 is a schematic structural view of a support body according to an embodiment of the present disclosure. As shown in fig. 1, the support body 10 has a planar region 13, at least one first inflection region 11 and at least one second inflection region 12. The at least one first inflection region 11 and the at least one second inflection region 12 intersect to form at least one bi-directional inflection region 100, and the planar region 13 is a region of the support body 10 other than the at least one first inflection region 11 and the at least one second inflection region 12. As shown in fig. 1, the embodiment shown in fig. 1 is a supporting body 10 including a first bending region 11 and a second bending region 12, where the first bending region 11 and the second bending region 12 intersect to form a bidirectional bending region 100.

Fig. 2 is a schematic structural view of another support body provided in an embodiment of the present disclosure. As shown in fig. 2, the support body 10 includes two buckling regions 100, and the two buckling regions 100 are aligned along a first direction x.

Alternatively, the plurality of inflection zones 100 may also be arranged along the second direction y. The bi-directional bending regions 100 can be arranged along the first direction x and the second direction y, so that more folding use forms and carrying forms can be realized.

It should be noted that the supporting body 10 may further include a plurality of bi-directional bending regions 100, wherein a portion of the bi-directional bending regions 100 are arranged along the first direction x, and a portion of the bi-directional bending regions 100 are arranged along the second direction y. For example, the support body 10 includes two first inflection zones 11 and two second inflection zones 12, and the two first inflection zones 11 and the two second inflection zones 12 intersect to form four bidirectional inflection zones 100, and the four bidirectional inflection zones 100 are arranged in an array.

Alternatively, when the support body 10 has a plurality of the bidirectional bending regions 100, a distance between two adjacent bidirectional bending regions 100 is greater than or equal to 2mm. The adjacent two buckling regions 100 are a first target buckling region 100 and a second target buckling region 100, respectively. If the distance between the first target inflection point 100 and the second target inflection point 100 is less than 2mm, the interval between the second inflection point 120 connected to the first target inflection point 100 and the second inflection point 120 connected to the second target inflection point 100 is small. The bending stress of one second unidirectional bending region 120 at the second bending axis passing through the second unidirectional bending region 120 is extended to an adjacent region, such as the other second unidirectional bending region 120, by the display film layer (e.g., flexible display panel) having the whole layer structure on the support member 1, resulting in an increase of the bending stress of the other second unidirectional bending region 120 at the second bending axis passing through the second unidirectional bending region 120. And the first target inflection region 100 and the second target inflection region 100 are connected by a first inflection region 110. The first unidirectional bending region 110 is relatively soft compared to the planar region 13, and a slight deformation occurs in bending deformation, which more easily causes bending stresses of the first target bidirectional bending region 100 and the second target bidirectional bending region 100 to affect each other.

The support body 10 is described below as having a first inflection region 11 and a second inflection region 12.

Fig. 3 is a schematic structural view of another support body provided in an embodiment of the present disclosure. As shown in fig. 3, the area of the first inflection region 11 except the inflection region 100 is a first inflection region 110, and the first inflection region 110 has a first hole pattern. The area of the second inflection region 12 other than the inflection region 100 is a second unidirectional inflection region 120, and the second unidirectional inflection region 120 has a second aperture pattern.

For the first inflection region 11, the second inflection region 12, and the bi-directional inflection region 100 formed by crossing the first inflection region 11 and the second inflection region 12, the support body 10 has a first inflection axis m and a second inflection axis n, the first inflection axis is parallel to the first direction x, and the second inflection axis is parallel to the second direction y. Here, the first bending axis m and the second bending axis n refer to axes, and there is no actual solid axis. The support body 10 may achieve bending in the second direction y and the first direction x along the first bending axis and the second bending axis, respectively. The first bending shaft and the second bending shaft both pass through the center of the first bending region 11, and the second bending shaft is located between the two connecting lines 101 and does not pass through the connecting lines 101.

As shown in fig. 3, in the embodiment of the disclosure, the support body 10 includes a plurality of zigzag connection lines 101 located in the bidirectional bending region 100, the plurality of connection lines 101 are arranged along a first direction x, and an extending direction of the connection lines 101 is the same as an extending direction of the second bending region 12 (hereinafter, will be referred to as a second direction y), where the first direction x is an extending direction of the first bending region 11.

Since the first inflection region 11 intersects the second inflection region 12 to form a bi-directional inflection region, the first direction x and the second direction y intersect. Illustratively, the first direction x and the second direction y are perpendicular. In other embodiments, the first direction x and the second direction y may form an angle other than 90 degrees.

The connection line 101 in the embodiment of the present disclosure includes a plurality of saw tooth structures 106 connected in sequence in the second direction y. Each serration structure 106 comprises at least one connecting section.

As shown in fig. 3, each saw tooth structure 106 includes a plurality of connected segments connected in sequence: the first connecting section 102, the second connecting section 103, the third connecting section 104 and the fourth connecting section 105, wherein the length direction of the first connecting section 102 and the third connecting section 104 is parallel to the first direction x, and the length direction of the second connecting section 103 and the fourth connecting section 105 is parallel to the second direction y.

Illustratively, as shown in fig. 3, the first connecting section 102 has two rectilinear sides aligned along the second direction y; the third connecting section 104 has two linear sides aligned along the second direction y; the second connection section 103 has straight sides and curved sides aligned in the first direction x, and the fourth connection section 105 has curved sides and straight sides aligned in the first direction x, wherein the straight sides of the second connection section 103 and the curved sides of the fourth connection section 105 are close to one end of the first direction x, and the curved sides of the second connection section 103 and the straight sides of the fourth connection section 105 are close to the other end of the first direction x. The manner of the arc connection of the arc side of the second connecting section 103 and the arc side of the fourth connecting section 105 can uniformly release stress at the time of bending, compared with the straight connection.

In this example, the first bending axis m passes through the second connection section 103 or the fourth connection section 105 of one serration structure 106 located in the middle in the second direction y.

In other possible embodiments, each saw tooth structure 106 includes a plurality of connected segments connected in sequence: a first connection section 102, a second connection section 103, a third connection section 104 and a fourth connection section 105. The first connecting section 102 and the third connecting section 104 have the same structure as that shown in fig. 3, and each have two linear sides aligned along the second direction y. The second connecting section 103 and the fourth connecting section 105 are different from the structure shown in fig. 3, and the second connecting section 103 has two straight sides aligned along the first direction x; the fourth connecting section 105 has two rectilinear side edges aligned along the first direction x.

Illustratively, with continued reference to fig. 3, the first aperture pattern includes a plurality of elongated first apertures 1101 arranged in an array, each first aperture 1101 having a length direction that is the same as the first direction x. When the supporting body 10 is bent in the second direction y (i.e. along the first bending axis m), the plurality of first openings 1101 can effectively reduce bending stress, which is more beneficial to bending the supporting body and avoid the supporting body from breaking during bending.

Optionally, the shape of the first opening 1101 is rectangular, oval or oval. In some examples, the lengths of the different first apertures 1101 may be the same or different.

Illustratively, the second opening pattern includes a plurality of elongated second openings 1201 arranged in an array, and a length direction of the second openings 1201 is the same as the second direction y. Similarly, when the support body 10 is bent in the first direction x (i.e. along the second bending axis n), the plurality of second openings 1201 can effectively reduce bending stress, which is more beneficial to bending and avoids breaking during bending.

Optionally, the shape of the second opening 1201 is rectangular, oval or oval. In some examples, the lengths of the different second apertures 1201 may be the same or different.

Fig. 4 is a schematic structural diagram of a bidirectional bending region according to an embodiment of the disclosure. As shown in fig. 4, the saw tooth structure 106 of the connection line 101 satisfies:

The alpha is a structural parameter of the sawtooth structure, has no practical significance, and is calculated according to the line width of the sawtooth structure and the maximum dimension in the first direction x; c is the line width of the saw-tooth structure, i.e. the width of each connection section of the saw-tooth structure in a direction perpendicular to the extension direction thereof, for example, the width of the first connection section 102 in a direction perpendicular to the extension direction of the first connection section 102; a is the maximum dimension of the saw tooth structure in the first direction x, i.e. the length of the aforementioned first connection section 102 and third connection section 104 in the first direction x. The length units of A and C in this formula are each in millimeters (mm). The connecting line 101 with the size conforming to the condition is proved by experiments, the supporting piece 1 is dynamically bent for 20 ten thousand times along the first bending axis and the second bending axis respectively, no additional defects exist, no cracking and damage of the supporting piece exist, the folding reliability is good, and the product requirement is met; if α > 462, this would lead to the problem of breakage of the support body during bending. The partial verification results are shown in table one.

Table of verification results of structural parameter α of a connection line

A/mm	C/mm	α＝C^3*10^5/A^3	Fold reliability condition
				1.2	0.08	29.62962963	OK
1.2	0.1	57.87037037	OK
				1.2	0.12	100	OK
1.2	0.15	195.3125	OK
				1.2	0.2	462.962963	NG

Illustratively, the saw tooth structure 106 satisfies: a is 0.5 mm-2 mm, C is 0.05 mm-0.3 mm, and D is 0.05 mm-1 mm. For example, the number of the cells to be processed, A is 0.5mm,1mm,1.2mm,1.5mm or 2mm; b is equal to 0.1mm,0.3mm,0.5mm,0.7mm,1mm,1.2mm,1.4mm,1.5mm,1.6mm,1.8mm or 2mm; c is 0.05mm,0.08mm,0.1mm,0.12mm,0.15mm,0.2mm,0.25mm or 0.3mm; d is 0.05mm,0.08mm,0.1mm,0.2mm,0.3mm,0.4mm,0.5mm,0.6mm,0.7mm,0.8mm,0.9mm or 1mm.

Wherein D is the opening size of the sawtooth structure. In this way, when the bidirectional bending area 100 is bent, the bidirectional bending area 100 is not broken, and the supporting piece 1 has good bending capability and strong capability of recovering to be flat after bending.

Here, the opening size refers to a size of a gap between two adjacent teeth in one saw tooth structure 106, for example, in fig. 3, the first connecting section 102, the second connecting section 103, and the third connecting section 104 are sequentially connected to form an unsealed portion in the second direction y; or the size of the unsealed part formed by sequentially connecting the third connecting section 104, the fourth connecting section 105 and the first connecting section 102 in the first saw-tooth structure. The first saw tooth structure and the second saw tooth structure are two adjacent saw tooth structures, and the fourth connecting section 105 of the first saw tooth structure is connected with the first connecting section 102 of the second saw tooth structure.

In one possible embodiment, as shown in fig. 4, the plurality of saw tooth structures in the same connection line 101 are identical in structure and size. Here, the same meaning of structure and dimensions, i.e. translating one saw tooth structure in the second direction y, may result in another saw tooth structure.

Illustratively, as shown in fig. 4, in the bi-directional bending region 100, the spacing between any two adjacent connection lines 110 is equal in the first direction x.

For example, in conjunction with fig. 3 and 4, in the first direction x, the pitch between any adjacent two of the connecting lines 110 may be equal to an integer multiple, for example, 1, 2, or 3 times, of the pitch (the distance between the centerlines of the two second openings 1201) of adjacent two of the second openings 1201 in the first direction x. That is, there are one or more rows of second openings 1201 between two adjacent connection lines 101 in the first direction x.

Alternatively, the spacing B between two adjacent connection lines 101 is 0.1mm to 2mm.

Fig. 5 is a schematic structural view of another bidirectional bending region according to an embodiment of the present disclosure. As shown in fig. 5, in the first direction x, the distance between two adjacent connection lines 101 near the center of the bidirectional bending region 100 in the bidirectional bending region 100 is larger than the distance between two adjacent connection lines 101 far from the center of the bidirectional bending region 100. Here, in the first direction x, the center of the two-way bend region 100 is the second bending axis n.

For example, B0 is the pitch between two adjacent connection lines 101 closest to the second bending axis n, that is, the pitch between the upper first connection line 101 and the lower first connection line 101 from the second bending axis n. B1 is a distance between the first connecting wire 101 and the second connecting wire 101 above the second bending axis n or a distance between the first connecting wire 101 and the second connecting wire 101 below the second bending axis n, and the two connecting wires 101 corresponding to B1 are far from the second bending axis n relative to the two connecting wires 101 corresponding to B0; b2 is a distance between the second connecting line 101 and the third connecting line 101 from the upper side of the second bending axis n or a distance between the second connecting line 101 and the third connecting line 101 from the lower side of the second bending axis n, and the two connecting lines 101 corresponding to B2 are far from the second bending axis n than the two connecting lines 101 corresponding to B1. Wherein B0 > B1 > B2.

The closer to the second bending axis n, the greater the bending stress, and the greater the spacing between adjacent connecting lines is to facilitate stress relief.

In the embodiment of the present disclosure, the connection line 101 realizes connection of the bidirectional bending region 101 with unidirectional bending regions on both sides in the first direction x or the second direction y.

In one possible embodiment, the spacing between two adjacent connecting lines 101 is an integer multiple, for example, 1, 2, or 3 times, the spacing (the distance between the centerlines of the two second apertures 1021) between corresponding two adjacent second apertures 1201 in the second unidirectional bending region 120. Here, "corresponding" means the second opening 1201 and the connection line 101 satisfying the following relationship: the projection of one or more second openings 1201 in the second unidirectional bending region 120 (i.e., the projection of the second openings 1201 on the first bending axis m) in the first direction x is located in the gap between the corresponding two adjacent connecting lines 101.

For example, in the first direction x, in the buckling region 100, the pitch of two adjacent connection lines 101 near the center of the buckling region 100 is equal to p1 times the pitch of the two second openings 1201, and the pitch of two adjacent connection lines 101 far from the center of the buckling region 100 is equal to p2 times the pitch of the two second openings 1201. Wherein, p1 and p2 are both positive integers, and p1 is greater than p2.

In the embodiment of the present disclosure, the second bending axis n passes through the second opening 1201 when passing through the second unidirectional bending region 120, that is, passes through the region where the solid portion of the second unidirectional bending region 120 is the smallest; meanwhile, when the second bending axis n passes through the bidirectional bending region 100, a gap between two adjacent connecting lines 101, that is, a region with the smallest solid portion of the bidirectional bending region 100 passes through, which is more beneficial to bending.

Fig. 6 is a schematic structural view of another bidirectional bending region according to an embodiment of the present disclosure. As shown in fig. 6, for any one of the connection lines 101 of the inflection region 100, in the second direction y, the size A1 of the serration structure near the center of the inflection region 100 in the first direction is greater than the size A2 of the serration structure far from the center of the inflection region 100 in the first direction. Here, in the second direction y, the center of the two-way bend region 100 is at the first bend axis. The closer to the first bending axis, the greater the bending stress, and the greater the size of the saw tooth structure in the first direction x, the better the stress relief. At this time, in the second direction y, from one end of one connecting line 101 to the other end, the dimension a of the saw tooth structure is increased from small to small, which is also referred to as a period of change of the dimension a. One connection line 101 may have only one period of variation of the dimension a.

In other possible embodiments, one connection line 101 may have multiple periods of variation of dimension a. For example, with a period of variation of two dimensions a, i.e. from one end of one connecting line 101 to the other, the dimension a of the saw tooth structure in the first direction may be small increasing, then decreasing, increasing finally decreasing. As another example, having a period of variation of three dimensions a, i.e. from one end of one connecting line 101 to the other, the dimension a of the saw tooth structure in the first direction may be small increasing and decreasing, increasing and decreasing last.

Fig. 7 is a schematic structural view of another bidirectional bending region according to an embodiment of the present disclosure. As shown in fig. 7, the plurality of connection lines 101 includes adjacent first connection lines 1011 and second connection lines 1012, the first connection lines 1011 and the second connection lines 1012 are arranged axisymmetrically about a symmetry axis O, the symmetry axis O is located between the first connection lines 1011 and the second connection lines 1012, and a length direction of the symmetry axis O is the second direction y.

In the embodiment shown in fig. 7, the first connection line 1011 and the second connection line 1012 have a plurality of opening regions in the first direction x, respectively. The plurality of opening areas on the first connection line 1011 near the second connection line 1012 are opposite to the plurality of opening areas on the second connection line 1012 near the first connection line 1011 one by one. Here, referring to fig. 3, the opening area refers to an unsealed portion formed by sequentially connecting the first connecting section 102, the second connecting section 103, and the third connecting section 104 in the zigzag structure 106. That is, the second connection line 1012 has a shift of half a period in the second direction y with respect to the first connection line 1011. Here, one period is a saw tooth structure.

In another possible embodiment, the second connection line 1012 has an offset of one quarter period in the second direction y with respect to the first connection line 1011.

Fig. 8 is a schematic structural view of another support body provided in an embodiment of the present disclosure. Fig. 9 is a partial enlarged view of fig. 8. As shown in fig. 8 and 9, the bidirectional bending region 100 further includes at least one third connection line 1013 located in the bidirectional bending region 100, the third connection line 1013 extending along the first direction x, the third connection line 1013 connecting the plurality of connection lines 101 adjacent in the first direction.

In one possible embodiment, the third connection line 1013 has a plurality of elongated openings 10130 therein, and the length direction of the openings is the first direction x. Alternatively, the elongated aperture 10130 may be rectangular, spindle-shaped, oval, or the like. In other possible implementations, the apertures 10130 may be square, diamond, circular, etc., as the disclosed embodiments are not limited in this regard.

Alternatively, as shown in fig. 9, the third connection lines 1013 connect all the connection lines 101 adjacent in the first direction x.

Illustratively, the plurality of openings 10130 of the third connection line 1013 are divided into a plurality of rows in the second direction y, as shown in fig. 8 and 9, and the plurality of openings 10130 of the third connection line 1013 are divided into two rows in the second direction y. The plurality of openings 10130 of the third connection line 1013 may be only one row in the second direction y, as shown in fig. 10 and 11. Fig. 10 is a schematic structural view of another support body provided in an embodiment of the present disclosure. Fig. 11 is a partial enlarged view of fig. 10.

Fig. 12 is a schematic structural view of another support body provided in an embodiment of the present disclosure. Fig. 13 is a partial enlarged view of fig. 12. As shown in fig. 12 and 13, any one of the plurality of connection lines 101 includes a plurality of first portions 10101 and a plurality of second portions 10102 alternately connected. The first portion 10101 comprises a fewer number of saw tooth structures than the second portion 10102. The size of the serration structures in the first section 10101 in the first direction x is greater than the size of the serration structures in the second section 10102 in the first direction x.

Illustratively, as shown in FIG. 13, the first portion 10101 comprises 2 saw tooth structures and the second portion 10102 comprises 4 saw tooth structures. In other possible embodiments, the first portion 10101 comprises 2 saw tooth structures and the second portion 10102 comprises 5 saw tooth structures; the first portion 10101 comprises 3 saw tooth formations, the second portion 10102 comprises 6 saw tooth formations, etc.

In other possible embodiments, the size of the serration structures in the first section 10101 in the first direction x is smaller than the size of the serration structures in the second section 10102 in the first direction x.

Illustratively, the maximum dimension of the serration structures in the first section 10101 in the first direction x is 1.8mm, and the maximum dimension of the serration structures in the second section 10102 in the first direction x is 1.6mm. Or the maximum dimension of the serration structures in the first section 10101 in the first direction x is 1.9mm, and the maximum dimension of the serration structures in the second section 10102 in the first direction x is 1.5mm.

In the actual process, since the plurality of connection lines aligned in the first direction x are long, a third connection line is provided in order to align the plurality of connection lines aligned in the first direction x (for example, the embodiment shown in fig. 8 and 9). To further enhance the bendable nature of the bi-directional bending zone 100, the portion of the third bond wire 1013 between any two adjacent bond wires 101 is removed to provide the embodiment of fig. 3. However, this process may result in local profile due to process variations, resulting in the embodiments shown in fig. 12 and 13.

Illustratively, as shown in fig. 12 and 13, a plurality of first portions 10101 of the plurality of connection lines 101 are arranged in an array along a first direction x and a second direction y, and a plurality of second portions 10102 of the plurality of connection lines 101 are arranged in an array along the first direction x and the second direction y. Experiments prove that the local special-shaped bidirectional bending region 100 can also pass bending tests, and the influence of local special-shaped deviation on the folding reliability of the bidirectional bending region 100 is small.

In a possible embodiment, the support body shown in fig. 12 and 13 may be further processed from the support body shown in fig. 8 and 9, for example, by cutting the portion of the support body 10 shown in fig. 8 and 9 between the first connection line 1011 and the second connection line 1012 by laser.

Fig. 14 is a schematic structural view of another support body provided in an embodiment of the present disclosure. As shown in fig. 14, in one possible embodiment, the bi-directional bending zone 100 does not include a plurality of connection lines 101, but is entirely filled with an elastic material.

In another possible embodiment, the inflection zones 100 do not include a plurality of connection lines 101, but are partially filled with an elastic material. Here, the partial filling means that the initial support body 10 located in the bi-directional bending region 100 has a whole layer structure without openings, a plurality of opening patterns including but not limited to circular holes, cross-shaped holes, square holes, etc. are formed on the initial support body 10 of the bi-directional bending region 100, and then the openings are filled with an elastic material.

The elastic material plays a role in buffering when the bidirectional bending region 100 is bent, so that damage such as cracking of the bidirectional bending region 100 of the supporting body due to bending is reduced. Alternatively, the elastic material is made of at least one of PU (Polyurethane), TPU (Thermoplastic Polyurethane ), polyacrylate, rubber, and silicone rubber. Here, the elastic material made of PU is also called PU foam.

Alternatively, the thickness t1 of the filled elastic material is the same as or similar to the thickness t0 of the support body 10. Preferably, the thickness difference Δt=t1-t 0 between the two should be equal to or less than ±0.05mm. If the material thickness of the filling area is less than or equal to 0.05mm than the thickness of the supporting body 10, the filling area may be severely recessed; if the material thickness of the filling area is greater than or equal to 0.05mm than the thickness of the supporting body 10, a significant protrusion of the appearance of the filling area may be caused. Both of these conditions are detrimental to the flatness of the support 1, which in turn affects the flatness of other structures (e.g., a flexible display panel) located on the support 1, affecting the display function of the flexible display device.

In another possible embodiment, the inflection region 100 is free of solid structures.

In another possible embodiment, the saw tooth structure 106 is formed by a first connecting section and a second connecting section, the first connecting section is arc-shaped, the arc-shaped first connecting section comprises two arc-shaped side edges arranged along the first direction x, and the two arc-shaped side edges protrude towards one side of the first direction x; the second connecting section is also arc-shaped, the arc-shaped second connecting section comprises two arc-shaped side edges which are arranged along the first direction x, and the two arc-shaped side edges protrude towards the other side of the first direction x. None of these sides is located between two adjacent connecting segments. The connection line 101 composed of the above-described saw tooth structure is in a wave shape.

In another possible embodiment, the saw tooth structure 106 is formed by a first connecting section and a second connecting section connected to each other, the first connecting section having two straight sides arranged in parallel with each other, the two straight sides forming an angle with both the first direction x and the second direction y. The second connecting section is provided with two straight-line side edges which are oppositely arranged in parallel, and the two straight-line side edges form an included angle with the first direction x and the second direction y. None of these sides is located between two adjacent connecting segments. The connecting line 101 formed by the zigzag structure is in a continuous delta-fold shape.

In one possible embodiment, as shown in fig. 3, the first unidirectional bending region 110 includes a first transition region 111, the first transition region 111 being located at a region of the first unidirectional bending region 110 that is adjacent to the planar region 13 in the second direction y; the first transition region 111 includes a plurality of third openings 1102, the length direction of the plurality of third openings 1102 is the first direction x, the lengths of the plurality of third openings 1102 are smaller than the lengths of the plurality of first openings 1101, and the lengths of the third openings 1102 close to the planar region 13 are smaller than the lengths of the third openings 1102 far from the planar region 111 in the plurality of third openings 1102. The length of the first apertures 1101 is equal in the regions of the first unidirectional bending region 110 except for the first transition region 111.

The second unidirectional bending region 120 includes a second transition region 121, and the second transition region 121 is located at a region of the second unidirectional bending region 120 that is close to the planar region 13 in the first direction x; the second transition region 121 includes a plurality of fourth holes 1202, the length direction of the plurality of fourth holes 1202 is the second direction y, the lengths of the plurality of fourth holes 1202 are smaller than the lengths of the plurality of second holes 1201, and the length of the fourth holes 1202 close to the planar region 13 is smaller than the length of the fourth holes 1202 far from the planar region 111 in the plurality of fourth holes 1202. The second apertures 1201 are of equal length in the second unidirectional inflection region 120 in regions other than the first transition region 121.

The support bodies shown in fig. 8 to 14 also have the first transition region 111 and the second transition region 121 described above, and these support bodies also have the structure of the third opening 1102 and the fourth opening 1202.

The closer to the first bending axis, the greater the bending stress, and the longer the length of the third aperture 1102 closer to the first bending axis, which is beneficial for releasing the bending stress; the closer to the second bending axis, the greater the bending stress, and the closer to the fourth aperture 1202 of the second bending axis, the longer the length, which is advantageous for releasing the bending stress. That is, the arrangement of the first transition region 111 and the second transition region 121 can effectively release stress, which is more beneficial to bending and avoids breakage during bending.

In another possible implementation, as shown in fig. 15, fig. 15 is a schematic structural view of another support body provided by an embodiment of the disclosure. The first unidirectional bending region 110 does not include the first transition region 111, the second unidirectional bending region 120 does not include the second transition region 121, and the bidirectional bending region 100 has no solid structure. The support body 10 can also be made to realize a bi-directional bending function.

In another possible implementation, as shown in fig. 16, fig. 16 is a schematic structural view of another support body provided by an embodiment of the disclosure. The first unidirectional bending region 110 of the support body 10 includes a first transition region 111, the second unidirectional bending region 120 includes a second transition region 121, and the bidirectional bending region 100 has no solid structure. The support body 10 can also be made to perform a bending function.

In another possible embodiment. The first unidirectional bending region 110 of the support body 10 includes a first transition region 111, the second unidirectional bending region 120 includes a second transition region 121, the bidirectional bending region 100 has a plurality of connection lines arranged along the first direction x, and non-solid regions (i.e., regions between the connection lines 101) in the bidirectional bending region 100 are filled with an elastic material. The support body 10 can also be made to perform a bending function. For the related content of the elastic material, reference is made to the description of the elastic material in fig. 14, and a detailed description thereof is omitted herein.

Fig. 17 is a schematic cross-sectional structure of a support provided in an embodiment of the present disclosure. As shown in fig. 17, the support 1 further includes a first adhesive layer 20, a spacer layer 30, and a second adhesive layer 40, and the support body 10, the first adhesive layer 20, the spacer layer 30, and the second adhesive layer 40 are laminated in this order.

The support body 10 is provided with holes to realize bending functions in two directions. The first adhesive layer 20 connects the support body 10 and the spacer layer 30, and the spacer layer is a whole layer structure, which is beneficial to keeping other structures (such as a flexible display panel) on the support member 1 flat. The second adhesive layer 40 connects the support 1 with other structures (e.g., a flexible display panel).

Illustratively, the second adhesive layer 40 is a monolithic structure and the spacer layer 30 is a monolithic structure. The first adhesive layer 20 covers the planar region 13.

In one possible embodiment, the first adhesive layer 20 also covers at least one first unidirectional bending region 110 or at least one second unidirectional bending region 120.

Illustratively, the thickness of the support body 10 is 0.05mm to 0.3mm, such as 0.05mm,0.1mm,0.15mm,0.2mm,0.25mm, or 0.3mm, etc. The thickness of the first adhesive layer 20 is 0.005mm to 0.05mm, for example, 0.005mm,0.01mm,0.015mm,0.02mm,0.025mm,0.03mm,0.035mm,0.04mm,0.045mm, or 0.05mm, etc. The thickness of the second adhesive layer 40 is 0.005mm to 0.05mm, for example, 0.005mm,0.01mm,0.015mm,0.02mm,0.025mm,0.03mm,0.035mm,0.04mm,0.045mm, or 0.05mm, etc. The thickness of the spacer layer 30 is 0.005mm to 0.2mm, for example, 0.005mm,0.01mm,0.03mm,0.05mm,0.08mm,0.1mm,0.12mm,0.015mm, or 0.2mm, etc.

The structure of each layer in the thickness range does not affect the thickness of the product due to excessive thickness, and does not affect the bending function of the flexible display device including the supporting member 1 due to poor supporting effect or poor bonding effect caused by excessive thinness.

Illustratively, the support body 10 is made of a metal material such as stainless steel, titanium alloy, aluminum alloy, or one of fiber reinforced rigid composite boards such as carbon fiber composite board, glass fiber composite board, and the like. These materials can etch the open hole pattern to realize bending and have enough rigidity to realize the supporting function.

Illustratively, the first adhesive layer 20 is made of acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive. The second adhesive layer 40 is made of acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive. These materials have tackiness to perform the bonding function.

Illustratively, the spacer layer 30 is made of one of stainless steel, copper foil, PI (polyimide), PET (polyethylene terephthalate), acryl-modified foam, polyurethane-modified foam, and silicone-modified foam. Wherein the stainless steel and the copper foil are made of bendable ultrathin materials. These materials can be bent, which is beneficial to the function of bending the supporting piece.

Compared with the scheme that the bidirectional bending region is entirely filled with the elastic material and the scheme that the bidirectional bending region has no solid structure, the bidirectional bending region 100 provided by the embodiment of the disclosure includes a plurality of connecting lines 101, which can provide better folding reliability, smaller folds and better impact resistance reliability for the bidirectional bending region 100.

Fig. 18 is a schematic cross-sectional structure of a flexible display device according to an embodiment of the present disclosure. As shown in fig. 18, the flexible display device includes a support 1, a flexible display panel 2, a third adhesive layer 3, and a cover plate 4. The support 1, the flexible display panel 2, the third adhesive layer 3, and the cover plate 4 are sequentially laminated. The support 1 supports the flexible display panel 2. The third bonding layer 3 connects the cover plate 4 and the flexible display panel 2, and the cover plate 4 has a protection function on the flexible display panel 2.

The support 1 may be any of the aforementioned supports. The embodiments of the present disclosure do not limit the types of the flexible display panel 2, including but not limited to an OLED (Organic LIGHT EMITTING Diode) display panel, a QLED (Quantum Dot LIGHT EMITTING Diode) display panel, and the like.

Optionally, the third adhesive layer 3 is a monolithic structure. Optionally, the third adhesive layer 3 is made of a pressure sensitive adhesive or an optical adhesive. These materials can realize an adhesive function without affecting the display function of the flexible display panel 2.

Illustratively, the cover plate 4 is made of glass or plastic. These materials can realize a protective function for the flexible display panel 2.

By way of example, the flexible display device provided in the embodiments of the present disclosure may be any foldable product or component having a display function, such as a mobile phone, a tablet computer, a display, a notebook computer, and the like.

The flexible display device has the same effects as the aforementioned support member, and will not be described again here.

The foregoing is merely an alternative embodiment of the present disclosure, and is not intended to limit the present disclosure, any modification, equivalent replacement, improvement, etc. that comes within the spirit and principles of the present disclosure are included in the scope of the present disclosure.

Claims

1. A support member, characterized in that the support member comprises a support body, wherein the support body has a plane area, at least one first bending area and at least one second bending area;

The at least one first bending zone and the at least one second bending zone intersect to form at least one bidirectional bending zone, the support body comprises a plurality of connecting lines located in the bidirectional bending zone, the connecting lines are serrated, the plurality of connecting lines are arranged along a first direction and extend along a second direction, the first direction is the extension direction of the first bending zone, and the second direction is the extension direction of the second bending zone; the area of the first bending zone other than the bidirectional bending zone is a first unidirectional bending zone, and the first unidirectional bending zone has a first opening pattern;

The area of the second bending zone other than the bidirectional bending zone is a second unidirectional bending zone, and the second unidirectional bending zone has a second opening pattern;

The plane area is an area on the support body excluding the at least one first bending area and the at least one second bending area.

2. The support member according to claim 1, characterized in that the connecting line comprises a plurality of sawtooth structures sequentially connected in the second direction, and the sawtooth structures satisfy:

Wherein, C is the line width of the sawtooth structure, and A is the maximum size of the sawtooth structure in the first direction.

3. The support member according to claim 2 is characterized in that the dimension of the sawtooth structure in the first direction is 0.5 mm to 2 mm; the line width of the sawtooth structure is 0.05 mm to 0.3 mm, and the opening dimension of the sawtooth structure is 0.05 mm to 1 mm.

4 . The support member according to claim 1 , wherein the distance between two adjacent connecting lines is 0.1 mm to 2 mm.

5 . The support member according to claim 1 , wherein the connection line comprises a plurality of sawtooth structures sequentially connected in the second direction, and the plurality of sawtooth structures have the same structure and size.

6. The support member according to claim 1 is characterized in that, in the first direction, in the bidirectional bending zone, the distance between two adjacent connecting lines close to the center of the bidirectional bending zone is greater than the distance between two adjacent connecting lines away from the center of the bidirectional bending zone.

7. The support member according to claim 1 is characterized in that the connecting line includes a plurality of serrated structures connected in sequence in the second direction, and in the second direction, for any connecting line in the bidirectional bending zone, the size of the serrated structure close to the center of the bidirectional bending zone in the first direction is larger than the size of the serrated structure far from the center of the bidirectional bending zone in the first direction.

8. The support member according to claim 1 is characterized in that the multiple connecting lines include adjacent first connecting lines and second connecting lines, the first connecting lines and the second connecting lines are arranged axially symmetrically about an axis of symmetry, the axis of symmetry is located between the first connecting lines and the second connecting lines, and the length direction of the axis of symmetry is the second direction.

9. The support member according to any one of claims 1 to 8 is characterized in that the support body also includes at least one third connecting line located in the bidirectional bending area, the third connecting line extends along the first direction, and the third connecting line connects at least two adjacent connecting lines in the first direction.

10 . The support member according to claim 9 , wherein the third connecting line has a plurality of openings, and the shapes of the openings include elongated strips, circles or diamonds.

11. The support member according to any one of claims 1 to 8, characterized in that any one of the plurality of connecting lines comprises a plurality of first portions and a plurality of second portions that are alternately connected;

The number of sawtooth structures included in the first part is less than the number of sawtooth structures included in the second part, and the size of the sawtooth structures in the first part in the first direction is greater than the size of the sawtooth structures in the second part in the first direction;

A plurality of the first portions of the plurality of connection lines are arranged in an array along the first direction and the second direction, and a plurality of the second portions of the plurality of connection lines are arranged in an array along the first direction and the second direction.

12. A support member according to any one of claims 1 to 8 and claim 10, characterized in that the support body comprises at least two of the bidirectional bending zones, at least two of the bidirectional bending zones are arranged along the first direction or the second direction, and the distance between two adjacent bidirectional bending zones is greater than or equal to 2 mm.

13. The support member according to any one of claims 1 to 8 and claim 10, characterized in that the first opening pattern comprises a plurality of first openings arranged in an array, and the length direction of the first openings is the same as the first direction;

The second opening pattern includes a plurality of second openings arranged in an array, and a length direction of the second openings is the same as the second direction.

14. The support member according to claim 13, characterized in that the first one-way bending zone comprises a first transition zone, and the first transition zone is located in a region of the first one-way bending zone close to the plane zone in the second direction;

The first transition zone includes a plurality of third openings, the length direction of the plurality of third openings is the first direction, the length of the third openings is smaller than the length of the first openings, and among the plurality of third openings, the length of the third openings close to the plane zone is smaller than the length of the third openings away from the plane zone.

15. The support member according to claim 13, characterized in that the second one-way bending zone comprises a second transition zone, and the second transition zone is located in a region of the second one-way bending zone close to the plane zone in the first direction;

The second transition zone includes a plurality of fourth openings, the length direction of the plurality of fourth openings is the second direction, the lengths of the fourth openings are all smaller than the length of the second openings, and among the plurality of fourth openings, the length of the fourth openings close to the plane zone is smaller than the length of the fourth openings away from the plane zone.

16 . The support member according to claim 13 , wherein in the first direction, one or more rows of the second openings exist between two adjacent connecting lines.

17. The support member according to any one of claims 1 to 8, claim 10 and claims 14 to 16, characterized in that the thickness of the support body is 0.05 mm to 0.3 mm.

18. The support member according to claim 17, characterized in that the support body is made of one of stainless steel, titanium alloy, aluminum alloy, carbon fiber composite plate, and glass fiber composite plate.

19. A support member according to any one of claims 1 to 8, claim 10, claims 14 to 16 and claim 18, characterized in that the support member further comprises a first bonding layer, a spacer layer and a second bonding layer, and the support body, the first bonding layer, the spacer layer and the second bonding layer are stacked in sequence.

20. The support member according to claim 19, characterized in that the thickness of the first adhesive layer is 0.005 mm to 0.05 mm;

The thickness of the second bonding layer is 0.005 mm to 0.05 mm;

The thickness of the spacer layer is 0.005 mm to 0.2 mm.

21. The support member according to claim 19, characterized in that the first adhesive layer is made of acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive;

The second adhesive layer is made of acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive.

22. The support member according to claim 19, characterized in that the spacer layer is made of one of stainless steel, copper, polyimide, polyethylene terephthalate, acrylic modified foam, polyurethane modified foam, and silicone modified foam.

23. A flexible display device, characterized in that the flexible display device comprises a flexible display panel, a third adhesive layer, a cover plate and the support member according to any one of claims 1 to 22;

The support member, the flexible display panel, the third adhesive layer and the cover plate are stacked in sequence.