CN215450705U

CN215450705U - Foldable display device

Info

Publication number: CN215450705U
Application number: CN202120939261.5U
Authority: CN
Inventors: 罗璇; 黄小霞; 熊韧; 张兵
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2022-01-07
Anticipated expiration: 2031-04-30

Abstract

The disclosure relates to a foldable display device, and belongs to the field of display. The foldable display device includes a flexible display panel, a flexible cover plate, and a flexible circuit board. The flexible display panel has a first foldable region including a first sub-region and a first side edge, a portion of the first side edge being a border of the first sub-region. The flexible cover plate is adhered to the first surface of the flexible display panel and provided with a second foldable area, the orthographic projection of the second foldable area on the first surface is located inside the first foldable area, the second foldable area is adhered to the first foldable area, and the orthographic projection of the second foldable area on the first surface is not overlapped with the first sub-area. The flexible circuit board is bound at first side, and the orthographic projection of flexible circuit board at the first surface is not coincide with the orthographic projection of first collapsible area at the first surface, has improved the problem that flexible apron produced the fold when buckling.

Description

Foldable display device

Technical Field

The present disclosure relates to the field of displays, and more particularly, to a foldable display device.

Background

The rise of foldable display devices has led to the rapid development of foldable display technologies. The foldable display device includes a Flexible display panel, a Flexible cover plate, and a Flexible Circuit board (FPC). The flexible cover plate is bonded on the surface of the flexible display panel to protect the surface of the flexible display panel. The first side of the flexible display panel is bound with the flexible circuit board, and the flexible circuit board is bent from the front of the flexible display panel to the back of the flexible display panel. The flexible cover plate can shield the flexible circuit board.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a foldable display device, which can improve the problem that a flexible cover plate generates wrinkles when being bent. The technical scheme is as follows:

the present disclosure provides a foldable display device, including: a flexible display panel having a first foldable region and a first side, the first foldable region including a first sub-region, a portion of the first side being a border of the first sub-region; the flexible cover plate is adhered to the first surface of the flexible display panel and provided with a second foldable area, the orthographic projection of the second foldable area on the first surface is positioned inside the first foldable area, the second foldable area is adhered to the first foldable area, and the orthographic projection of the second foldable area on the first surface is not overlapped with the first sub-area; the flexible circuit board is bound on the first side edge, and the orthographic projection of the flexible circuit board on the first surface is not overlapped with the second foldable area.

In one implementation of the embodiment of the present disclosure, an edge of the flexible cover plate has a notch, and the notch is located in an extending direction of the second foldable area; the flexible circuit board comprises two first parts which are respectively positioned at two sides of the first foldable area in the extending direction of the first side edge; at the first surface, orthographic projections of the two first parts are at least partially overlapped with orthographic projections of parts, located on two sides of the notch, of the flexible cover plate.

In one implementation manner of the embodiment of the present disclosure, a width of the notch is greater than or equal to a width of the second foldable area, and both the width of the notch and the width of the second foldable area are dimensions in an extending direction of the first side edge.

In one implementation of the embodiment of the present disclosure, an orthographic projection of the flexible circuit board on the first surface is not overlapped with an orthographic projection of the flexible cover plate on the first surface.

In one implementation manner of the embodiment of the present disclosure, the foldable display device further includes: a housing comprising an annular bezel surrounding an edge of the flexible display panel, the annular bezel and the flexible cover plate being located on a same side of the flexible display panel; a gap is formed between the annular baffle and the flexible display panel, the flexible circuit board is located in the gap, and the orthographic projection of the flexible circuit board is located in the orthographic projection of the annular baffle on the first surface.

In one implementation of the embodiment of the present disclosure, a surface of the flexible cover plate away from the flexible display panel is flush with a surface of the ring-shaped baffle plate away from the flexible display panel.

In one implementation of the disclosed embodiment, the inner edge of the annular flap is attached to the edge of the flexible cover sheet.

In one implementation manner of the embodiment of the present disclosure, the foldable display device further includes: first adhesive material layer, be located flexible display panel with between the flexible cover board, first adhesive material layer is in the orthographic projection of first surface with flexible circuit board is in the orthographic projection of first surface does not coincide one side at first side place, the edge on first adhesive material layer is outstanding the edge of flexible cover board, first adhesive material layer with flexible cover board forms first step, ring baffle have with first step matched with second step.

In one implementation manner of the embodiment of the present disclosure, a width of the step surface of the first step ranges from 0.2 mm to 0.5 mm, and the width of the step surface is a dimension in a direction perpendicular to an extending direction of the first side and parallel to the first surface.

In one implementation of the disclosed embodiment, the housing further comprises: a bottom plate opposite the annular baffle; the side plate is connected between the outer edge of the bottom plate and the outer edge of the annular baffle plate, the bottom plate and the side plate form an accommodating space, and the flexible display panel is located in the accommodating space.

In one implementation manner of the embodiment of the present disclosure, the foldable display device further includes: the touch panel is positioned between the flexible display panel and the flexible cover plate and is provided with a third foldable area and a second side edge, the third foldable area comprises a second sub area, and one part of the second side edge is the boundary of the second sub area; the orthographic projection of the second foldable area on the first surface is positioned inside the third foldable area, and the orthographic projection of the second foldable area on the first surface is not coincident with the orthographic projection of the second subarea on the first surface; and the touch flexible circuit board is bound at the second side edge, and the orthographic projection of the touch flexible circuit board on the first surface is not overlapped with the orthographic projection of the third foldable area on the first surface.

In an implementation manner of the embodiment of the present disclosure, two opposite surfaces of the touch panel are both bound to the touch flexible circuit board.

In one implementation manner of the embodiment of the present disclosure, the foldable display device further includes: the second adhesive layer is located the touch panel with between the flexible display panel, the second adhesive layer is in the orthographic projection of first surface with the touch-control flexible circuit board is in the orthographic projection of first surface does not coincide in one side at second side place, the edge of flexible display panel is outstanding the edge of second adhesive layer.

In one implementation manner of the embodiment of the present disclosure, the flexible display panel has a second surface, and the second surface and the first surface are two opposite surfaces of the supporting plate, and the foldable display device further includes: the supporting plate is provided with a third surface and a fourth surface which are opposite, the third surface is attached to the second surface, and the flexible circuit board is bent to the fourth surface of the supporting plate.

In one implementation of the disclosed embodiment, the support plate has a groove extending from an edge of the fourth surface to a middle of the fourth surface; the foldable display device further includes: and the flexible circuit board is electrically connected with the driving circuit.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

in the embodiment of the present disclosure, since the orthographic projection of the first sub-region of the first foldable region and the orthographic projection of the second foldable region on the first surface are not coincident, the orthographic projection of the flexible circuit board on the first surface is not coincident with the second foldable region. That is, the second foldable area of the flexible cover is retracted such that the second foldable area of the flexible cover is bonded to the first foldable area. When flexible apron buckled, the folding region of flexible apron all can receive the effect of bonding force, can not produce the fold because of buckling, has improved the problem that flexible apron produced the fold when buckling.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a top view of a foldable display device provided by an embodiment of the present disclosure in a planar state;

fig. 2 is a side view of a foldable display device in a folded state according to an embodiment of the present disclosure;

FIG. 3 is a schematic cross-sectional view taken along plane A-A of FIG. 1;

fig. 4 is a top view of a flexible display panel provided by an embodiment of the present disclosure;

FIG. 5 is a top view of a flexible cover provided by embodiments of the present disclosure;

FIG. 6 is a top view of a flexible display panel, flexible cover sheet and flexible circuit board assembly provided by an embodiment of the present disclosure;

FIG. 7 is a top view of another flexible cover provided by embodiments of the present disclosure;

FIG. 8 is a top view of another flexible display panel, flexible cover sheet, and flexible circuit board assembly provided by embodiments of the present disclosure;

FIG. 9 is a top view of another flexible cover provided by embodiments of the present disclosure;

FIG. 10 is a top view of another flexible display panel, flexible cover sheet, and flexible circuit board assembly provided by embodiments of the present disclosure;

fig. 11 is a structural diagram of a foldable display device provided in an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In the related art, the flexible circuit board is bonded to the first side of the flexible display panel, and an area for bonding the flexible circuit board in the flexible display panel is not bonded to the flexible cover plate, that is, the folding area of the flexible cover plate has a portion that is not bonded to the flexible display panel. For the inward folding type foldable display device (the flexible cover plate is arranged on the inner side after being folded), when the foldable display device is bent, the part of the flexible cover plate which is not bonded with the flexible display panel is also bent, and the bent flexible cover plate is extruded, so that the part of the flexible cover plate which is not bonded with the flexible display panel and is bent is folded.

Fig. 1 is a top view of a foldable display device provided in an embodiment of the present disclosure in a planar state. Referring to fig. 1, the foldable display device has a first planar display region 11, a bendable display region 12, and a second planar display region 13 connected in sequence along a first direction a. When the foldable display device is in a planar state, the surface of the first planar display region 11, the surface of the bendable display region 12, and the surface of the second planar display region 13 are all in the same plane. The display device is bent in the bendable display region 12, and the display device can be changed from a flat state to a bent state, in which the first flat display region 11 and the second flat display region 13 are opposite to each other.

The foldable display device provided by the embodiment of the disclosure may be a foldable display device of a fold-in type, and fig. 2 is a side view of the foldable display device provided by the embodiment of the disclosure in a folded state. Referring to fig. 2, the foldable display device includes a flexible display panel 10 and a flexible Cover (Cover)20, which are stacked. When the foldable display device is in a bent state, the flexible cover plate 20 is located at the inner side of the bend, so that the flexible cover plate 20 is subjected to bending pressure, and the flexible cover plate 20 is soft in material and is easy to wrinkle when subjected to the pressure.

In other implementations, the foldable display device may be a fold-out foldable display device, the flexible cover sheet being outside the bend when the fold-out foldable display device is in a folded state.

Fig. 3 is a schematic cross-sectional view taken along the plane a-a in fig. 1. Referring to fig. 3, the foldable display device includes: a flexible display panel 10, a flexible cover plate 20, and a flexible circuit board 30. The flexible display panel 10 has a first foldable area 101 and a first side edge 104, the first foldable area 101 comprising a first sub-area 103, a portion of the first side edge 104 being a border of the first sub-area 103. The flexible cover 20 is adhered to the first surface 102 of the flexible display panel 10, the flexible cover 20 has a second foldable area 201, an orthographic projection of the second foldable area 201 on the first surface 102 is located inside the first foldable area 101, the second foldable area 201 is adhered to the first foldable area 101, and an orthographic projection of the second foldable area 201 on the first surface 102 is not overlapped with the first sub-area 103. The flexible circuit board 30 is bound to the first side edge 104 of the flexible display panel 10, and an orthogonal projection of the flexible circuit board 30 on the first surface 102 is not overlapped with the second foldable area 201.

In the embodiment of the present disclosure, an orthographic projection of the flexible circuit board 30 on the first surface 102 is not overlapped with the first foldable area 101, that is, the flexible circuit board 30 is not bound to a bent portion of the flexible display panel 10, so that the flexible circuit board 30 is prevented from being damaged in the bending process.

In the related art, since the flexible cover 20 generates wrinkles when being bent, and the flexible cover 20 may be separated from the flexible display panel 10, the foldable display panel provided in the embodiment of the present disclosure improves the problem that the flexible cover 20 generates wrinkles when being bent, and also can effectively improve the problem that the flexible cover 20 is separated from the flexible display panel 10.

Fig. 4 is a top view of a flexible display panel provided by an embodiment of the present disclosure. Referring to fig. 4, the first foldable area 101 is rectangular and the border of the first sub-area 103 is part of the first side edge 104. The flexible display panel 10 further has a first planar area 106 and a second planar area 107, the first planar area 106 and the second planar area 107 being located on both sides of the first foldable area 101 along the first direction a, respectively. The first foldable area 101 is opposite to the bendable display area 12. The first planar area 106 is opposite to the first planar display area 11 and the second planar area 107 is opposite to the second planar display area 13.

As shown in fig. 4, the first foldable area 101 further comprises a third sub-area 108. The third sub-area 108 and the first sub-area 103 constitute a first foldable area 101. And the orthographic projection of the second foldable area 201 coincides with the third sub-area 108 at the first surface 102.

In the disclosed embodiment, the flexible display panel 10 may be a flexible OLED display panel.

Fig. 5 is a top view of a flexible cover provided by embodiments of the present disclosure. Referring to fig. 5, the flexible cover 20 further has a third planar area 204 and a fourth planar area 205, and the third planar area 204 and the fourth planar area 205 are respectively located at both sides of the second foldable area 201 along the first direction a. The second foldable area 201 is opposite to the foldable display area 12, the third planar area 204 is opposite to the first planar display area 11, and the fourth planar area 205 is opposite to the second planar display area 13.

In the embodiment of the present disclosure, the flexible cover plate 20 may be a Polyimide (PI) cover plate or a transparent Polyimide (CPI) cover plate, which ensures the flexibility and transparency of the flexible cover plate 20.

Referring again to fig. 5, the edge of the flexible cover 20 has a notch 202, and the notch 202 is located in the extending direction b of the second foldable area 201, so that the flexible cover 20 has a shape of a Chinese character 'ao'. In fig. 5, the second foldable area 201 has a rectangular shape, the notch 202 has a rounded rectangular shape, and one side of the second foldable area 201 is a part of one side of the notch 202. Arranging the shape of the notch 202 as a rounded rectangle can reduce the phenomenon of stress concentration at the edges of the notch 202.

Fig. 6 is a top view of an assembly of a flexible display panel, a flexible cover plate and a flexible circuit board provided by an embodiment of the present disclosure. Among them, the flexible display panel 10 shown in fig. 6 is the flexible display panel 10 shown in fig. 4, and the flexible cover 20 shown in fig. 6 is the flexible cover 20 shown in fig. 5. Referring to fig. 6, the flexible circuit board 30 includes two first portions 301, in the first direction a, the two first portions 301 are respectively located at two sides of the first foldable area 101, and in the first surface 102, an orthographic projection of the two first portions 301 at least partially coincides with an orthographic projection of portions of the flexible cover 20 located at two sides of the notch 202.

When the flexible cover 20 is bent, the flexible cover 20 may be subjected to a large bending pressure in the second foldable area 201, and therefore, the flexible cover 20 needs to be adhered to the flexible display panel 10, so that the flexible cover 20 is wrinkled due to the bending pressure. While the flexible cover plate 20 is subjected to a negligible bending pressure in the third planar area 204 and the fourth planar area 205. Therefore, the flexible cover sheet 20 generally does not wrinkle in the third planar region 204 and the fourth planar region 205.

In the implementation of the present disclosure, the flexible cover plate 20 is partially retracted in the second foldable area 201, so that the second foldable area 201 of the flexible cover plate 20 is completely bonded to the flexible display panel 10, which not only ensures that no wrinkle is generated when the flexible cover plate 20 is bent, but also ensures that the area of the flexible cover plate 20 is large compared with the whole side edge of the flexible cover plate 20 is retracted, and the surface of the flexible display panel 10 can be protected. Meanwhile, the orthographic projection of the flexible circuit board 30 is partially overlapped with the orthographic projection of the flexible cover plate 20, so the flexible circuit board 30 can be shielded in the third plane area 204 and the fourth plane area 205 of the flexible cover plate 20, and the flexible circuit board 30 and the flexible display panel 10 can be protected.

In one possible implementation manner, the flexible circuit board 30 includes at least two circuit boards, and in the first direction a, the at least two circuit boards are respectively located at two sides of the first foldable area 101, all the circuit boards located at one side of the first foldable area 101 are one first portion 301, and all the circuit boards located at the other side of the first foldable area 101 are the other first portion 301. In another possible implementation manner, the flexible circuit board 30 includes a circuit board, for example, the circuit board is in a shape of "Y", the Y-shaped circuit board has two branches, one end of each branch is bound to the flexible display panel 10, the other ends of the two branches are connected, and the two branches of the flexible circuit board 30 are two first portions 301.

Referring again to fig. 5 and 6, the width L1 of the notch 202 is greater than the width L2 of the second foldable area 201, and the width L1 of the notch 202 and the width L2 of the second foldable area 201 are both dimensions in the extending direction of the first side edge 104. The first side 104 extends in a direction corresponding to the first direction a. At this time, there may be a portion of the two first portions 301 located within the gap 202.

In the disclosed embodiment, the width L1 of the notch 202 may be greater than the width L2 of the second foldable area 201, so as to prevent the flexible cover 20 from folding or tilting at the interface between the notch 202 and the second foldable area 201.

In other implementations, the width L1 of the notch 202 may be equal to the width L2 of the second foldable area 201, so that the width L1 of the notch 202 is the smallest, and the area of the flexible cover 20 is the largest, thereby further improving the protection effect of the flexible cover 20 on the surface of the flexible display panel 10. At this time, at the first surface 102, the orthographic projection of the two first portions 301 is located inside the orthographic projection of the portions of the flexible cover plate 20 located on both sides of the notch 202.

Illustratively, the difference between the width of the notch 202 and the width of the second foldable area 201 is in the range of 0 mm to 5 mm.

In the disclosed embodiment, the notch 202 may be a right-angled rectangle, a trapezoid, or the like.

The flexible cover 20 shown in fig. 5 and 6 has a notch 202, and the flexible display panel 10 is bound with the flexible circuit board 30 at one side edge in fig. 6. In other implementations, the flexible circuit board 30 may be bound to two or more sides of the flexible display panel 10.

Fig. 7 is a top view of another flexible cover provided by embodiments of the present disclosure. Referring to fig. 7, the edge of the flexible cover 20 has two notches 202, and the two notches 202 are respectively located at two sides of the second foldable area 201 in the extending direction b of the second foldable area 201.

Fig. 8 is a top view of another flexible display panel, flexible cover sheet, and flexible circuit board assembly provided by embodiments of the present disclosure. Among them, the flexible display panel 10 shown in fig. 8 is the flexible display panel 10 shown in fig. 4, and the flexible cover 20 shown in fig. 8 is the flexible cover 20 shown in fig. 7. Referring to fig. 8, the flexible display panel 10 has two first side edges 104, and the flexible circuit board 30 is bound to each of the two first side edges 104.

The flexible cover 20 shown in fig. 5 and 8 has a notch 202, and the orthographic projection of the flexible circuit board 30 is partially overlapped with the orthographic projection of the flexible cover 20. In other implementations, the flexible cover plate 20 may not have a notch, and the orthographic projection of the flexible circuit board 30 is not overlapped with the orthographic projection of the flexible cover plate 20.

Fig. 9 is a top view of another flexible cover provided by embodiments of the present disclosure. Referring to fig. 9, the flexible cover 20 is not notched. And the size of the second foldable area 201 in the flexible cover 20 shown in fig. 9 is the same as the size of the second foldable area 201 in the flexible cover 20 shown in fig. 5, the edge of the third planar area 204 and the edge of the fourth planar area 205 are inwardly contracted so that the edge of the third planar area 204 and the edge of the fourth planar area 205 are flush with the edge of the second foldable area 201.

Fig. 10 is a top view of another flexible display panel, flexible cover sheet, and flexible circuit board assembly provided by embodiments of the present disclosure. Referring to fig. 10, an orthographic projection of the flexible circuit board 30 on the first surface 102 is not coincident with an orthographic projection of the flexible cover plate 20 on the first surface 102. Among them, the flexible display panel 10 shown in fig. 10 is the flexible display panel 10 shown in fig. 4, and the flexible cover 20 shown in fig. 10 is the flexible cover 20 shown in fig. 9.

In the embodiment of the present disclosure, the whole side of the flexible cover plate 20 is retracted inward, so that the whole surface of the flexible cover plate 20 is bonded to the flexible display panel 10, and when the flexible cover plate 20 is bent, the flexible cover plate 20 is subjected to the bonding force, and no wrinkle is generated due to bending.

Referring again to fig. 3, the foldable display device further includes: a housing 40. The housing 40 includes a ring-shaped baffle 401, the ring-shaped baffle 401 surrounds an edge of the flexible display panel 10, the ring-shaped baffle 401 and the flexible cover plate 20 are located on the same side of the flexible display panel 10, a gap 402 is formed between the ring-shaped baffle 401 and the flexible display panel 10, the flexible circuit board 30 is located in the gap 402, and an orthographic projection of the flexible circuit board 30 is located in an orthographic projection of the ring-shaped baffle 401 on the first surface 102. The housing 40 may be a middle frame or a case of the foldable display device, or the like. Wherein the portion of the flexible circuit board 30 bound with the flexible display panel 10 is located within the gap 402.

Since the flexible cover plate 20 may not completely shield the flexible circuit board 30 after retracting, a portion of the flexible circuit board 30 may be exposed, which affects the appearance of the display device, and meanwhile, the exposed portion of the flexible circuit board 30 is not shielded, which is more easily damaged than the shielded portion. In the embodiment of the present disclosure, the housing 40 is disposed, the gap 402 between the ring bezel 401 and the flexible display panel 10 is used to dispose the flexible circuit board 30, and the orthographic projection of the flexible circuit board 30 is located within the orthographic projection of the ring bezel 401. The annular baffle 401 can block the flexible circuit board 30, the attractiveness of the display device is prevented from being affected, meanwhile, the flexible circuit board 30 is protected, and the possibility of damage to the flexible circuit board 30 is reduced. Because the annular baffle 401 belongs to the shell 40, the material strength is high, and wrinkles are not easy to generate when the annular baffle is bent.

In the embodiment of the present disclosure, the housing 40 is a metal housing, and the strength of the housing 40 is ensured. When the foldable display device is bent, the housing 40 is also bent, and the metal has a certain bending property and high material strength, and is not easily wrinkled when bent.

Alternatively, in other implementations, the housing 40 is a plastic housing, and the density of the plastic is low, which can reduce the weight of the foldable display device.

Referring again to fig. 3, the housing 40 further includes: a bottom panel 404 and side panels 405. The bottom plate 404 is opposite the annular baffle 401. The side plate 405 is connected between the outer edge of the bottom plate 404 and the outer edge of the ring-shaped baffle 401, the bottom plate 404 and the side plate 405 form an accommodating space 406, and the flexible display panel 10 is located in the accommodating space 406. Typically, the housing 40 includes a plurality of side panels 405, and the plurality of side panels 405 are connected to the bottom panel 404 and the side panels 405, respectively.

In the embodiment of the present disclosure, the annular baffle 401, the bottom plate 404 and the side plate 405 form an accommodating space 406, and the flexible display panel 10 is located in the accommodating space 406, so that the side of the flexible display panel 10 can be protected, and damage caused by collision of the side of the flexible display panel 10 is avoided.

Referring again to fig. 3, the surface 206 of the flexible cover plate 20 facing away from the flexible display panel 10 is flush with the surface 411 of the ring shaped barrier 401 facing away from the flexible display panel 10.

In the embodiment of the present disclosure, the surface 411 of the ring-shaped baffle 401 is flush with the surface 206 of the flexible cover plate 20, which ensures the flatness of the surface of the foldable display device. Meanwhile, compared with the related art in which the ring-shaped baffle 401 is disposed on the flexible cover plate 20, the structure of the foldable display device provided in the embodiment of the disclosure can reduce the thickness of the housing 40, and also reduce the thickness of the foldable display device, which is beneficial to the lightness and thinness of the foldable display device.

Referring again to fig. 3, the inner edge of the ring baffle 401 conforms to the edge of the flexible cover plate 20.

In the embodiment of the present disclosure, the inner edge of the ring-shaped baffle 401 is attached to the edge of the flexible cover plate 20, so that the ring-shaped baffle 401 and the flexible cover plate 20 can completely cover the surface of the flexible display panel 10, and the effect of protecting the surface of the flexible display panel 10 is improved.

Referring again to fig. 3, the foldable display device further includes: a first glue layer 50. The first glue layer 50 is located between the flexible display panel 10 and the flexible cover sheet 20. The first glue layer 50 bonds the flexible display panel 10 and the flexible cover sheet 20 together.

Illustratively, the first Adhesive layer 50 may be an Optical Clear Adhesive (OCA) layer or a foam Adhesive layer.

In the embodiment of the present disclosure, an orthogonal projection of the first adhesive layer 50 on the first surface 102 is not overlapped with an orthogonal projection of the flexible circuit board 30 on the first surface 102, so as to prevent the first adhesive layer 50 from covering the flexible circuit board 30 and affecting the performance of the flexible circuit board 30.

Referring again to fig. 3, on the side of the first side edge 104, the edge of the first adhesive layer 50 protrudes beyond the edge of the flexible cover plate 20, the first adhesive layer 50 and the flexible cover plate 20 form a first step 203, and the annular baffle 401 has a second step 403 which is matched with the first step 203.

In the embodiment of the present disclosure, the first adhesive layer 50 and the flexible cover plate 20 form the first step 203, and then the step surface 231 of the first step 203 is a part of the surface of the first adhesive layer 50 and also has viscosity, and the step surface 431 of the second step 403 is attached to the step surface 231 of the first step 203, so that the ring-shaped baffle 401 is adhered to the flexible display panel 10, and the stability of the housing 40 is increased.

In the embodiment of the present disclosure, for the flexible cover sheet 20 shown in fig. 5 and 6, the second foldable area 201 of the flexible cover sheet 20 is bonded to the flexible cover sheet 20 through the first adhesive layer 50, and the portion of the flexible cover sheet 20 opposite to the flexible circuit board 30 is not bonded to the flexible cover sheet 20 through the first adhesive layer 50. That is, only at the notch 202, the edge of the first glue layer 50 protrudes beyond the edge of the flexible cover sheet 20.

For the flexible cover sheet 20 shown in fig. 9 and 10, the flexible cover sheet 20 is bonded to the flexible cover sheet 20 by the first adhesive layer 50. On the side of the first side edge 104, the edge of the entire side edge of the first glue layer 50 protrudes beyond the edge of the flexible cover sheet 20.

In the embodiment of the present disclosure, the width of the step surface 231 of the first step 203 ranges from 0.2 mm to 0.5 mm, and the width of the step surface 231 is a dimension in a direction perpendicular to the extending direction of the first side edge 104 and parallel to the first surface 102.

The width of the step surface 231 defining the first step 203 is in the range of 0.2 mm to 0.5 mm, which can ensure that the step surface 231 of the first step 203 is adhered to the ring-shaped baffle 401, and at the same time, enough area is left on the first side 104 of the flexible display panel 10 to be bound with the flexible circuit board 30.

Referring again to fig. 3, the foldable display device further includes: a Touch Panel (TP) 60 and a Touch Flexible Circuit board (TFPC) 70. The touch panel 60 is located between the flexible display panel 10 and the flexible cover 20, the touch panel 60 has a third foldable area 601 and a second side 603, the third foldable area 601 includes a second sub-area 602, and a portion of the second side 603 is a boundary of the second sub-area 602. The orthographic projection of the second foldable area 201 on the first surface 102 is located inside the orthographic projection of the third foldable area 601 on the first surface 102, and the orthographic projection of the second foldable area 201 on the first surface 102 is not coincident with the orthographic projection of the second subregion 602 on the first surface 102. The touch flexible circuit board 70 is bound to the second side 603 of the touch panel 60, and an orthogonal projection of the touch flexible circuit board 70 on the first surface 102 is not overlapped with an orthogonal projection of the third foldable area 601 on the first surface 102.

It should be noted that, in the cross-sectional view of fig. 3, the third foldable area 601 is overlapped with the first foldable area 101, and the second sub-area 602 is overlapped with the first sub-area 103. But the first foldable area 101 and the first sub-area 103 belong to the flexible display panel 10. The third foldable area 601 and the second sub-area 602 belong to the touch panel 60.

The touch panel 60 and the touch flexible circuit board 70 are arranged in the foldable display device so that the foldable display device can implement a touch function.

Meanwhile, the orthographic projection of the second subarea 602 of the third foldable area 601 on the first surface 102 is not overlapped with the orthographic projection of the second foldable area 201 on the first surface 102, the orthographic projection of the touch flexible circuit board 70 on the first surface 102 is not overlapped with the orthographic projection of the third foldable area 601 on the first surface 102, that is, the folding areas of the flexible cover 20 are adhered to the touch panel 60, the folding area of the flexible cover 20 does not extend to the area of the touch panel 60 bound with the touch flexible circuit board 70, and the area of the touch panel 60 bound with the touch flexible circuit board 70 cannot be adhered to the flexible cover 20. When the flexible cover plate 20 is bent, the folded area of the flexible cover plate 20 is under the action of the adhesive force, so that wrinkles caused by bending are avoided, and the problem that the wrinkles are generated when the flexible cover plate 20 is bent is solved.

In the embodiment of the present disclosure, the orthographic projection of the touch flexible circuit board 70 on the first surface 102 is not overlapped with the orthographic projection of the third foldable area 601 on the first surface 102, that is, the touch flexible circuit board 70 is not bound to the folded portion of the touch panel 60, so that the touch flexible circuit board 70 is prevented from being damaged during the bending process.

Referring to fig. 3 again, two opposite sides of the touch panel 60 are bound to the touch flexible circuit board 70, so as to increase the binding area between the touch panel 60 and the touch flexible circuit board 70.

Referring again to fig. 3, the foldable display device further includes: a second glue layer 80. The second adhesive layer 80 is located between the touch panel 60 and the flexible display panel 10, the second adhesive layer 80 bonds the flexible display panel 10 and the touch panel 60 together, and at this time, the first adhesive layer 50 bonds the touch panel 60 and the flexible cover 20 together.

Illustratively, the second adhesive layer 80 may be an optical adhesive layer or a foam adhesive layer.

In the embodiment of the present disclosure, the orthographic projection of the second adhesive layer 80 on the first surface 102 is not overlapped with the orthographic projection of the touch flexible circuit board 70 on the first surface 102, so as to prevent the touch flexible circuit board 70 from being covered by the second adhesive layer 80 to affect the performance of the touch flexible circuit board 70.

Referring to fig. 3 again, at the second side 603, the edge of the touch panel 60 protrudes beyond the edge of the second adhesive layer 80.

In the embodiment of the present disclosure, two opposite surfaces of the touch panel 60 are both bound to the touch flexible circuit board 70, the second adhesive layer 80 is located on the touch panel 60 and the flexible display panel 10, and the size of the second adhesive layer 80 is reduced on the side where the second side 603 is located, so that an enough area is left in the touch panel 60 to bind to the touch flexible circuit board 70, which is convenient for binding the touch panel 60 to the touch flexible circuit board 70.

Referring again to fig. 3, the foldable display device further includes: a Polarizer (Polarizer, POL) 100. The polarizer 100 is located between the flexible display panel 10 and the second adhesive layer 80, and the polarizer 100 is used for changing the polarization direction of the polarized light, so as to ensure that the foldable display device can display pictures.

As shown in fig. 3, since the second adhesive layer 80 is retracted, the edge of the polarizer 100 protrudes from the edge of the second adhesive layer 80 on the side where the second side edge 603 is located, that is, the edge of the second adhesive layer 80 is retracted.

In the embodiment of the disclosure, in the extending direction b of the second foldable area 201, the length range of the edge of the polarizer 100 protruding out of the edge of the second adhesive layer 80 is 0.2 mm to 0.5 mm, which is not only convenient for binding the touch panel 60 and the touch flexible circuit board 70, but also avoids that the edge of the second adhesive layer 80 is too much retracted, which results in too small area of the second adhesive layer 80 and affects the bonding between the touch panel 60 and the flexible display panel 10.

Referring to fig. 3 again, in the extending direction b of the second foldable area 201, there is a gap between the flexible circuit board 30 and the polarizer 100 for manufacturing tolerance.

In the film diagram shown in fig. 3, the edge of the first adhesive layer 50 is not flush with the edge of the flexible cover 20, and the edge of the polarizer 100 is not flush with the edge of the second adhesive layer 80.

Fig. 11 is a schematic structural diagram of a foldable display device provided in an embodiment of the present disclosure. Referring to fig. 11, the structure shown in fig. 11 is different from that of fig. 3 in that the edge of the first adhesive layer 50 is flush with the edge of the flexible cover sheet 20, and the edge of the polarizer 100 is flush with the edge of the second adhesive layer 80.

In the embodiment of the present disclosure, after the flexible display panel 10, the polarizer 100, the second adhesive layer 80, the touch panel 60, the first adhesive layer 50, and the flexible cover plate 20 are attached together, the flexible display panel 10, the polarizer 100, the second adhesive layer 80, the touch panel 60, the first adhesive layer 50, and the flexible cover plate 20 may be cut in a die cutting manner on the side where the flexible circuit board 30 and the touch flexible circuit board 70 are not arranged, so that the edge of the flexible display panel 10, the edge of the polarizer 100, the edge of the second adhesive layer 80, the edge of the touch panel 60, the edge of the first adhesive layer 50, and the edge of the flexible cover plate 20 are flush on the side where the flexible circuit board 30 and the touch flexible circuit board 70 are not arranged in the foldable display device.

Referring again to fig. 3 and 11, the flexible display panel 10 further has a second surface 105, the second surface 105 and the first surface 102 are two opposite surfaces of the flexible display panel 10, and the foldable display device further includes: a support plate 90. The supporting plate 90 has a third surface 901 and a fourth surface 902 opposite to each other, the third surface 901 is attached to the second surface 105, and the flexible circuit board 30 is bent to the fourth surface 902 of the supporting plate 90.

In the embodiment of the present disclosure, the supporting plate 90 is arranged to support the flexible display panel 10, ensuring the form of the foldable display device in a planar state.

Referring again to fig. 3 and 11, the support plate 90 has a groove 903, the groove 903 extending from an edge of the fourth surface 902 toward a middle of the fourth surface 902. The foldable display device further includes a driving circuit on the recess 903, and the flexible circuit board 30 is electrically connected to the driving circuit.

In the embodiment of the present disclosure, the groove 903 extends from the edge of the fourth surface 902 to the middle of the fourth surface 902 to form a third step 904, the driving circuit is disposed in the groove 903, and the flexible circuit board 30 and the portion of the touch flexible circuit board 70 electrically connected to the driving circuit are also located in the groove 903, thereby reducing the thickness of the foldable display device.

Illustratively, the support plate 90 is a metal support plate, which ensures the support and bending properties of the support plate 90.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A foldable display device, characterized in that the foldable display device comprises:

a flexible display panel (10) having a first foldable region (101) and a first side edge (104), the first foldable region (101) comprising a first sub-region (103), a portion of the first side edge (104) being a border of the first sub-region (103);

a flexible cover sheet (20) adhered to a first surface (102) of the flexible display panel (10), the flexible cover sheet (20) having a second foldable region (201), an orthographic projection of the second foldable region (201) on the first surface (102) being located inside the first foldable region (101), the second foldable region (201) being adhered to the first foldable region (101), and an orthographic projection of the second foldable region (201) on the first surface (102) being not coincident with the first sub-region (103);

a flexible circuit board (30) bound to the first side edge (104), wherein an orthographic projection of the flexible circuit board (30) on the first surface (102) is not coincident with the second foldable area (201).

2. The foldable display device according to claim 1, wherein an edge of the flexible cover sheet (20) has a notch (202), the notch (202) being located in an extending direction of the second foldable area (201);

the flexible circuit board (30) comprises two first parts (301), and the two first parts (301) are respectively positioned at two sides of the first foldable area (101) in the extending direction of the first side edge (104);

at the first surface (102), the orthographic projections of the two first portions (301) at least partially coincide with the orthographic projections of the portions of the flexible cover plate (20) located on both sides of the notch (202).

3. The foldable display device according to claim 2, wherein the width of the notch (202) is larger than or equal to the width of the second foldable area (201), and the width of the notch (202) and the width of the second foldable area (201) are both dimensions in the extension direction of the first side edge (104).

4. The foldable display device of claim 1, wherein an orthographic projection of the flexible circuit board (30) on the first surface (102) is not coincident with an orthographic projection of the flexible cover sheet (20) on the first surface (102).

5. The foldable display device of any one of claims 1 to 4, further comprising:

a housing (40) comprising an annular bezel (401), the annular bezel (401) surrounding an edge of the flexible display panel (10), and the annular bezel (401) and the flexible cover sheet (20) being located on a same side of the flexible display panel (10);

a gap (402) is formed between the annular baffle plate (401) and the flexible display panel (10), the flexible circuit board (30) is located in the gap (402), and the orthographic projection of the flexible circuit board (30) is located in the orthographic projection of the annular baffle plate (401) on the first surface (102).

6. The foldable display device according to claim 5, wherein a surface (206) of the flexible cover sheet (20) facing away from the flexible display panel (10) is flush with a surface (411) of the ring shaped barrier (401) facing away from the flexible display panel (10).

7. The foldable display device of claim 5, wherein an inner edge of the ring-shaped baffle (401) conforms to an edge of the flexible cover sheet (20).

8. The foldable display device of claim 5, further comprising:

first glue layer (50), be located flexible display panel (10) with between flexible apron (20), first glue layer (50) are in the orthographic projection of first surface (102) with flexible circuit board (30) are in the orthographic projection of first surface (102) does not coincide first side (104) one side at place, the edge of first glue layer (50) is outstanding the edge of flexible apron (20), first glue layer (50) with flexible apron (20) form first step (203), annular baffle (401) have with first step (203) matched with second step (403).

9. The foldable display device according to claim 8, wherein a width of the step face (231) of the first step (203) ranges from 0.2 mm to 0.5 mm, and the width of the step face (231) is a dimension in a direction perpendicular to an extending direction of the first side edge (104) and parallel to the first surface (102).

10. The foldable display device of claim 5, wherein the housing (40) further comprises:

a bottom plate (404) opposite the annular baffle (401);

the side plate (405) is connected between the outer edge of the bottom plate (404) and the outer edge of the annular baffle plate (401), the bottom plate (404) and the side plate (405) form an accommodating space (406), and the flexible display panel (10) is located in the accommodating space (406).

11. The foldable display device of any one of claims 1 to 4 or 6 to 9, further comprising:

a touch panel (60) located between the flexible display panel (10) and the flexible cover sheet (20), the touch panel (60) having a third foldable area (601) and a second side edge (603), the third foldable area (601) comprising a second sub-area (602), a portion of the second side edge (603) being a boundary of the second sub-area (602); the orthographic projection of the second foldable region (201) on the first surface (102) is positioned inside the orthographic projection of the third foldable region (601) on the first surface (102), and the orthographic projection of the second foldable region (201) on the first surface (102) is not coincident with the orthographic projection of the second subregion (602) on the first surface (102);

a touch flexible circuit board (70) bound at the second side edge (603), wherein an orthographic projection of the touch flexible circuit board (70) on the first surface (102) is not coincident with an orthographic projection of the third foldable area (601) on the first surface (102).

12. The foldable display device of claim 11, wherein opposite sides of the touch panel (60) are bound to the touch flexible circuit board (70).

13. The foldable display device of claim 12, further comprising:

the second adhesive layer (80) is located between the touch panel (60) and the flexible display panel (10), the orthographic projection of the first surface (102) and the orthographic projection of the touch flexible circuit board (70) on the first surface (102) are not overlapped, one side of the second side edge (603) is located, and the edge of the touch panel (60) protrudes out of the edge of the second adhesive layer (80).

14. The foldable display device according to any one of claims 1 to 4 or 6 to 9, wherein the flexible display panel (10) further has a second surface (105), the second surface (105) and the first surface (102) being opposite surfaces of the flexible display panel (10), the foldable display device further comprising:

the supporting plate (90) is provided with a third surface (901) and a fourth surface (902) which are opposite, the third surface (901) is attached to the second surface (105), and the flexible circuit board (30) is bent to the fourth surface (902) of the supporting plate (90).

15. The foldable display device of claim 14, wherein the support panel (90) has a groove (903), the groove (903) extending from an edge of the fourth surface (902) to a middle of the fourth surface (902);

the foldable display device further includes:

and the flexible circuit board (30) is electrically connected with the driving circuit.