CN115240542A - Flexible display device - Google Patents

Abstract

A flexible display device includes a supporting layer and a flexible display panel. The support layer has two non-folding regions and a folding region located between the two non-folding regions. The folding area is provided with a central area and two edge areas. Each edge region is located between one of the two non-folding regions and the central region, and the opening rate of the two edge regions is different from that of the central region. The flexible display panel is located on the supporting layer. Therefore, the gradual change design of mechanical stiffness can be realized, and the crease of the flexible display panel on the supporting layer is avoided.

Description

Flexible display device

Technical Field

The present disclosure relates to a flexible display device.

Background

In the market of various consumer electronic products, flexible display devices, such as electronic paper devices, have been developed, wherein a display medium layer is mainly composed of an electrophoretic liquid and charged particles mixed in the electrophoretic liquid. By applying a voltage to the display medium layer, the charged particles can be driven to move in opposite directions, so that each pixel region can display a bright surface or a dark surface. Because the flexible display device achieves the purpose of displaying by irradiating the display medium layer by using incident light, and the incident light can be sunlight or indoor ambient light, a backlight source is not needed, and the power consumption can be saved.

The flexible display device comprises a flexible display panel with a display medium layer and a supporting layer attached to the back of the flexible display panel. Generally, the supporting layer needs to have a folding area with low stiffness and a non-folding area with high stiffness to provide folding and supporting functions for the flexible display panel, respectively. However, when the panel is folded due to a sudden change in stiffness between the folded and unfolded regions, a crease appears at the edge of the folded region. In addition, the folding area of the traditional supporting layer has no special design, which easily causes the situation of uneven internal stress and poor writing feeling of the touch pen during bending.

Disclosure of Invention

One aspect of the present disclosure is a flexible display device.

According to an embodiment of the present disclosure, a flexible display device includes a supporting layer and a flexible display panel. The support layer has two non-folding regions and a folding region located between the two non-folding regions. The folding area is provided with a central area and two edge areas. Each edge region is located between one of the two non-folding regions and the central region, and the opening rate of the two edge regions is different from that of the central region. The flexible display panel is located on the supporting layer.

In an embodiment of the present disclosure, the opening ratio of each of the edge regions is smaller than the opening ratio of the central region.

In an embodiment of the present disclosure, the opening ratio of the two edge regions gradually increases from the two non-folded regions to the central region.

In an embodiment of the disclosure, the central region has a plurality of first openings, each of the edge regions has a plurality of second openings, a length of the second openings is smaller than a length of the first openings, and the length of the second openings gradually decreases from the central region to one of the two non-folding regions.

In an embodiment of the present disclosure, the central region has a plurality of first openings, each of the edge regions has a plurality of second openings, a width of the second openings is smaller than a width of the first openings, and the width of the second openings gradually decreases from the central region to one of the two non-folding regions.

In an embodiment of the present disclosure, the central region has a plurality of first openings, each of the edge regions has a plurality of second openings, and a shape of the first openings is different from a shape of the second openings.

In an embodiment of the present disclosure, the first opening is rectangular, and the second opening is diamond-shaped.

In an embodiment of the disclosure, the central region has a plurality of first openings, each of the edge regions has a plurality of second openings, a distance between two adjacent ones of the second openings along a direction is greater than a distance between two adjacent ones of the first openings along the direction, and the distance between two adjacent ones of the second openings along the direction gradually increases from the central region to one of the two non-folded regions.

In one embodiment of the present disclosure, the folding area has a bending axis, and the direction is a direction perpendicular to the bending axis.

In one embodiment of the present disclosure, the folding area has a bending axis, and the direction is a direction parallel to the bending axis.

In one embodiment of the present disclosure, the two non-folding regions have no opening.

In an embodiment of the disclosure, the central area has a plurality of first openings, and each of the first openings is staggered with an adjacent first opening along a length direction of the supporting layer.

In an embodiment of the present disclosure, the central area has a plurality of adjacent first openings. The first openings are arranged obliquely.

In the above embodiments of the present disclosure, the folding area of the supporting layer has a central area and two edge areas, and the aperture ratio of the two edge areas is different from the aperture ratio of the central area, so that a gradual design of mechanical stiffness can be achieved. Therefore, the sudden change of stiffness of the edge area of the folding area can be reduced, and the flexible display panel on the supporting layer is prevented from generating creases.

Another aspect of the present disclosure is a flexible display device.

According to an embodiment of the present disclosure, a flexible display device includes a supporting layer and a flexible display panel. The support layer has two non-folding regions and a folding region located between the two non-folding regions. The folding area is provided with a bending shaft and a plurality of openings. Each opening has a different dimension in a direction perpendicular to the bending axis. The flexible display panel is located on the supporting layer.

In one embodiment of the present disclosure, the opening of the folding area is zigzag, cross, diamond or oval.

In an embodiment of the present disclosure, the opening of the folding region has a body region and an extension region. The length direction of the main body area is parallel to the bending axis, and the extension area extends from the main body area to the direction vertical to the bending axis.

In an embodiment of the present disclosure, the extension region communicates with an end portion or a central portion of the main body region.

In an embodiment of the disclosure, two adjacent openings along a direction perpendicular to the bending axis have two corresponding positions, and the size of the extension region connecting the end of the main body region is smaller than the distance between the two corresponding positions.

In an embodiment of the present disclosure, the extending region forms a right angle or an obtuse angle with an end of the main body region.

In an embodiment of the present disclosure, the extension region connecting the end of the body region is arc-shaped or L-shaped.

In one embodiment of the present disclosure, the openings of the folding area are diamond-shaped. The apex angle of each opening is in the range of 1 to 15 degrees. The distance between adjacent ones of the openings in a direction perpendicular to the bending axis is in a range of 200 μm to 2 cm.

In one embodiment of the present disclosure, the opening of the folding area is a diamond. The distance between the two adjacent openings along the direction perpendicular to the bending axis gradually increases from the bending axis to the two non-folding areas.

In the above-mentioned embodiments of the present disclosure, since the folding region has a bending axis and a plurality of openings, and each opening has a different dimension along a direction perpendicular to the bending axis, each opening will have a laterally extending area. Therefore, the length of the force arm of the un-opened hole region of the folding region can be shortened, and the external force required by torsion is improved. When the touch control pen is used for writing on the flexible display panel, the torsion degree of the un-perforated area can be reduced, and the writing feeling is improved. In addition, the transverse distance between two adjacent holes can be shortened due to the design of the holes, so that the internal stress can be effectively diffused, the stress distribution uniformity is improved, and the flexible display panel is prevented from being wrinkled.

Drawings

Aspects of the present disclosure are best understood from the following description of the embodiments when read with the accompanying drawings. It is noted that, in accordance with standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion.

FIG. 1 is a side view illustrating a foldable flexible display device according to an embodiment of the present disclosure;

FIG. 2 is a top view of the flexible display device of FIG. 1 in a flattened state;

fig. 3-9 illustrate top views of a support layer according to various embodiments of the present disclosure;

10-13 illustrate top views of openings according to various embodiments of the present disclosure;

fig. 14-15 illustrate top views of a support layer according to various embodiments of the present disclosure;

FIG. 16 depicts a partial enlarged view of the opening of FIG. 15;

FIG. 17 depicts a top view of the support layer of FIG. 15 after compression;

FIG. 18 depicts a top view of a support layer, according to an embodiment of the disclosure;

FIG. 19 illustrates a top view of a support layer according to one embodiment of the present disclosure;

FIG. 20 shows a close-up view of a folded region of a support layer according to an embodiment of the present disclosure;

fig. 21 shows a partially enlarged view of a folding region of a support layer according to an embodiment of the disclosure.

[ notation ] to show

100 flexible display device

110,110a to 110l of a supporting layer

112 non-folding zone

114,114a to 114l folding zone

116,116a to 116l central area

118, 118a-118 f edge region

120 flexible display panel

D1, D2, D3, D4: direction

d1 to d8 are distances

E, E1 to E3 extension region

L is a bending shaft

M body region

O1 first opening

O2 second opening

O3, O4, opening

S1, S2 size

Obtuse angle theta

Angle of theta 1 to top angle

Detailed Description

The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. Of course, these are merely examples and are not intended to be limiting. For example, formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, embodiments of the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Additionally, spatially relative terms such as "below … …," "below," "lower," "above," "upper," and similar terms may be used herein for ease of description to describe one element or feature's relationship to another (other) element or feature as illustrated in the figures. These spatially relative terms are intended to encompass different orientations of the elements in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Throughout the discussion herein, unless otherwise specified, the same or similar numbers in different figures indicate the same or similar elements formed by the same or similar forming methods using the same or similar materials.

Fig. 1 is a side view illustrating a foldable flexible display device 100 according to an embodiment of the present disclosure. Fig. 2 is a top view of the flexible display device 100 of fig. 1 in a flat state. Referring to fig. 1 and fig. 2, the flexible display device 100 includes a supporting layer 110 and a flexible display panel 120. The flexible display panel 120 is disposed on the support layer 110. The support layer 110 has two non-folding regions 112 and a folding region 114 located between the two non-folding regions 112. The supporting layer 110 may be a metal plate (e.g., an aluminum plate), and the flexible display panel 120 may be an electronic paper, but not limited to the disclosure. The flexible display panel 120 may include a tft array substrate and a front panel, and the front panel has a display medium layer and a transparent substrate. When the flexible display device 100 is folded, the folding area 114 of the supporting layer 110 is configured to bend with the flexible display panel 120. When the flexible display device 100 is laid flat, the supporting layer 110 has sufficient rigidity to support the flexible display panel 120, and the non-folding area 112 is configured for a user to press and write on the flexible display panel 120 thereon with a finger or a stylus. In the following description, various embodiments of the fold region 114 of the support layer 110 will be described.

Fig. 3 to 9 illustrate top views of the supporting layers 110,110a to 110f according to various embodiments of the present disclosure. Wherein. The support layers 110 a-110 f can be substituted for the support layer 110 of fig. 1 and 2, as previously described. Referring to fig. 3, the folding region 114 of the supporting layer 110 has a central region 116 and two edge regions 118. The edge region 118 is located between the non-folded region 112 and the central region 116, and the aperture ratio of the edge region 118 is different from the aperture ratio of the central region 116. For example, the opening ratio of the two edge regions 118 is smaller than that of the central region 116. In addition, the two non-folded regions 112 are not perforated, and thus the non-folded regions 112 have a smaller opening ratio than the edge regions 118 of the non-folded regions 112. With the above arrangement, the stiffness of the edge region 118 of the folded region 114 is greater than the stiffness of the central region 116, but less than the stiffness of the non-folded region 112, and has the effect of distributing stress.

Since the folding region 114 of the support layer 110 has a central region 116 and two edge regions 118, and the aperture ratio of the two edge regions 118 is different from that of the central region 116, a gradual design of mechanical stiffness can be achieved. Therefore, the abrupt change of stiffness of the edge region 118 of the folding region 114 can be reduced, and the flexible display panel 120 (see fig. 1 and 2) on the support layer 110 can be prevented from being folded.

In the present embodiment, the central region 116 has a plurality of first openings O1, the edge region 118 has a plurality of second openings O2, the length of the second openings O2 is less than the length of the first openings O1, and the length of the second openings O2 decreases from the central region 116 to the non-folding region 112. The first opening O1 and the second opening O2 are configured such that the folding region 114 of the support layer 110 has a bendable characteristic.

In addition, the edge region 118 has a plurality of rows of second openings O2, and the length of the second openings O2 becomes gradually shorter from the central region 116 toward the non-folded region 112. As such, the aperture ratio of the edge region 118 may gradually decrease from the central region 116 to the non-folded region 112.

In the present embodiment, the first opening O1 and the second opening O2 are oval, and the length of the first opening O1 and the second opening O2 may be 30mm or less, 15mm or less, 5mm or less, and more preferably 1mm or less.

It is to be understood that the connection, materials and functions of the elements described above will not be repeated and are described in detail. In the following description, other forms of support layers will be described.

Referring to fig. 4, the folding region 114a of the support layer 110a has a central region 116a and two edge regions 118a. The present embodiment is different from the embodiment of fig. 3 in that the first opening O1 and the second opening O2 are rectangular. The edge region 118a has a plurality of rows of second openings O2, and the length of the second openings O2 is gradually shorter from the central region 116a toward the non-folded region 112. As such, the opening ratio of the edge region 118a may gradually decrease from the central region 116a to the non-folded region 112. Such a configuration can reduce the abrupt change of stiffness of the edge region 118a of the folding region 114a, and prevent the flexible display panel 120 (see fig. 1 and 2) on the supporting layer 110a from being folded.

Referring to fig. 5, the folding region 114b of the support layer 110b has a central region 116b and two edge regions 118b. This embodiment is different from the embodiment of fig. 4 in that the length of the first opening O1 is the same as the length of the second opening O2, the width of the second opening O2 is smaller than the width of the first opening O1, and the width of the second opening O2 is gradually decreased from the central region 116b to the non-folded region 112. In addition, the edge region 118b has a plurality of rows of second openings O2, and the width of the second openings O2 gradually narrows from the central region 116a toward the non-folded region 112. As such, the opening ratio of the edge region 118b may gradually decrease from the central region 116b to the non-folded region 112. Such a configuration can reduce the abrupt change of stiffness of the edge region 118b of the folding region 114b, and prevent the flexible display panel 120 (see fig. 1 and 2) on the supporting layer 110b from being folded. In the present embodiment, the widths of the first opening O1 and the second opening O2 may be 500 μm or less, 300 μm or less, 100 μm or less, and more 50 μm or less.

Referring to fig. 6, the folding region 114c of the supporting layer 110c has a central region 116c and two edge regions 118c. The fold region 114c has a fold axis L, which may be an axis of symmetry of the fold region 114 c. This embodiment differs from the embodiment of fig. 5 in that the width of the first opening O1 is the same as the width of the second opening O2, the distance D2 between the adjacent two of the second openings O2 in the direction D1 perpendicular to the bending axis L is greater than the distance D1 between the adjacent two of the first openings O1 in the direction D1, and the distance D2 between the adjacent two of the second openings O2 in the direction D1 gradually increases from the central region 116c toward the non-folded region 112. As such, the opening ratio of the edge region 118c may gradually decrease from the central region 116c to the non-folded region 112. Such a configuration can reduce the abrupt change of stiffness of the edge region 118c of the folding region 114c, and prevent the flexible display panel 120 (see fig. 1 and 2) on the supporting layer 110c from being folded. In the present embodiment, the distances d1 and d2 may be 0.05mm or more, 0.3mm or more, 0.5mm or more, and more preferably 1mm or more.

Referring to fig. 7, the folding region 114d of the supporting layer 110d has a central region 116d and two edge regions 118d. The folding zone 114d has a bending axis L, which may be an axis of symmetry of the folding zone 114 d. This embodiment differs from the embodiment of fig. 5 in that the width of the first opening O1 is the same as the width of the second opening O2, the distance D3 between the adjacent two of the second openings O2 in the direction D2 parallel to the bending axis L is greater than the distance D4 between the adjacent two of the first openings O1 in the direction D2, and the distance D3 between the adjacent two of the second openings O2 in the direction D2 gradually increases from the central region 116D toward the non-folded region 112. As such, the aperture ratio of the edge region 118d may gradually decrease from the central region 116d to the non-folded region 112. Such a configuration can reduce the abrupt change of stiffness of the edge region 118d of the folding region 114d, and prevent the flexible display panel 120 (see fig. 1 and 2) on the supporting layer 110d from being folded.

Referring to fig. 8, the folding region 114e of the supporting layer 110e has a central region 116e and two edge regions 118e. This embodiment differs from the embodiment of fig. 4 in that the shape of the first aperture O1 is different from the shape of the second aperture O2 of the edge region 118e. The first opening O1 of the central region 116e is rectangular and the second opening O2 of the edge region 118e is diamond-shaped. As such, the aperture ratio of the edge region 118e may gradually decrease from the central region 116e to the non-folded region 112. Such a configuration can reduce the abrupt change of stiffness of the edge region 118e of the folding region 114e, and prevent the flexible display panel 120 (see fig. 1 and 2) on the supporting layer 110e from being folded.

Referring to fig. 9, the supporting layer 110f has two non-folding regions 112 and a folding region 114f located between the two non-folding regions 112. The folding area 114f has a bending axis L and a plurality of openings O3. Each opening O3 has a different dimension in a direction perpendicular to the bending axis L (e.g., horizontal direction). The opening O3 has different dimensions S1 and S2 in a direction perpendicular to the bending axis L, for example, the dimension S1 is smaller than the dimension S2. In this embodiment, the opening O3 of the folding area 114f is zigzag-shaped, and in other embodiments, the opening O3 may also be cross-shaped, diamond-shaped, or oval-shaped.

The opening O3 of the folding region 114f has a body region M and an extension region E. The length direction of the main body region M is parallel to the bending axis L, and the extension region E extends from the main body region M to the direction perpendicular to the bending axis L. The extension E of the opening O3 communicates with the end of the body region M. The extension region E makes a right angle with the end of the body region M. In addition, in the present embodiment, two adjacent ones of the openings O3 in the direction perpendicular to the bending axis L have two corresponding positions, and the dimension S2 of the extension region E that communicates with the end of the body region M is smaller than the distance d5 between the two corresponding positions. The difference between the distance d5 and the dimension S2 may be less than 1mm, or less than 0.5mm, or even less than 0.2mm.

Since the folding region 114f has the bending axis L and the plurality of apertures O3, and each aperture O3 has a different dimension in a direction perpendicular to the bending axis L, each aperture O3 will have a laterally extending area. Thus, the arm length of the un-opened region of the folded region 114f can be shortened, and the external force required for generating torsion can be increased. When a touch pen is used to write on the flexible display panel 120 (see fig. 1 and 2), the twisting degree of the un-perforated area can be reduced, and the writing feeling can be improved. In addition, the above design of the openings O3 can also shorten the transverse distance between two adjacent openings O3, effectively diffuse the internal stress, improve the uniformity of stress distribution, and prevent the flexible display panel 120 from buckling.

Fig. 10-13 illustrate top views of the opening O3 according to various embodiments of the present disclosure. The opening O3 of fig. 10 to 13 may replace the opening O3 of fig. 9. Referring to fig. 10, the opening O3 has a body region M and an extension region E1. This embodiment differs from the embodiment of fig. 9 in that the extension region E1 makes an obtuse angle θ with the end of the body region M.

Referring to fig. 11, the opening O3 has a body region M and an extension region E2. This embodiment differs from the embodiment of fig. 9 in that the extension region E2 communicating with the end of the body region M is L-shaped.

Referring to fig. 12, the opening O3 has a body region M and an extension region E3. This embodiment differs from the embodiment of fig. 9 in that the extension E3 communicating with the end of the body region M is arc-shaped.

Referring to fig. 13, in another embodiment, the position of the un-opened region of the support layer 110f of fig. 9 can be designed as an opening O4, and the position of the opening O3 of the folded region 114f of fig. 9 can be designed as an un-opened region, so as to obtain the structure of fig. 13.

Fig. 14-15 illustrate top views of support layers 110g, 110h according to various embodiments of the present disclosure. Referring to fig. 14, the support layer 110g has two non-folding regions 112 and a folding region 114g located between the two non-folding regions 112. The folding area 114g has a bending axis L and a plurality of openings O3. This embodiment differs from the embodiment of fig. 9 in that the extension E4 of the opening O3 communicates with the central portion of the body region M, not the end portion of the body region M. With this configuration, the opening O3 may have a cross shape.

Referring to fig. 15, the support layer 110h has two non-folding regions 112 and a folding region 114h located between the two non-folding regions 112. This embodiment differs from the embodiment of fig. 9 in that the opening O3 of the folding zone 114h is diamond-shaped.

Fig. 16 is a partially enlarged view of the opening O3 of fig. 15. Referring to fig. 15 and 16, the vertex angle θ 1 of the diamond is smaller than 15 degrees, for example, the vertex angle θ 1 of the opening O3 is in the range of 1 to 15 degrees. The folding zone 114h has a folding axis L. The distance d6 between the openings O3 of the folding region 114h along the direction perpendicular to the bending axis L is less than 2cm, less than 1cm, and more preferably less than 500 μm. The distance d6 is, for example, in the range of 200 μm to 2 cm.

Fig. 17 shows a top view of the support layer 110h of fig. 15 after compression. The supporting layer 110h has a plurality of diamond-shaped openings O3, such that the supporting layer 110h can be attached to the back surface of the flexible display panel 120 (see fig. 1 and 2) in a lateral compression manner.

Fig. 18 illustrates a top view of a support layer 110i according to an embodiment of the disclosure. The support layer 110i has two non-folded regions 112 and a folded region 114i located between the two non-folded regions 112. The openings O3 of the folding zone 114i are diamond-shaped. The distance between the adjacent openings O3 in the direction perpendicular to the bending axis L gradually increases from the bending axis L to the two non-folded regions 112. For example, the distance d8 between two adjacent openings O3 in fig. 18 is greater than the distance d7 between two other adjacent openings O3.

Fig. 19 illustrates a top view of a support layer 110j according to an embodiment of the disclosure. The support layer 110j has two non-folded regions 112 and a folded region 114j located between the two non-folded regions 112. This embodiment differs from the embodiment of fig. 15 in that the opening O3 of the folded region 114j is oval.

Fig. 20 shows a partially enlarged view of the folding region 114k of the support layer 110k according to an embodiment of the disclosure. The folding region 114k of the support layer 110k has a central region 116k and two edge regions 118f. This embodiment is different from the embodiment of fig. 3 in that each first opening O1 of the central region 116k is staggered with the adjacent first openings O1 along the length direction D3 of the support layer 110 k. In more detail, the end portions of two adjacent first openings O1 along the length direction D3 of the support layer 110k are not aligned.

FIG. 21 is a partially enlarged view of the folding region 114l of the supporting layer 110l according to an embodiment of the disclosure. The folding region 114l of the support layer 110l has a central region 116l and two edge regions 118f. This embodiment differs from the embodiment of fig. 20 in that the first openings O1 of the central region 116k are arranged obliquely, for example, along the direction D4. The direction D4 may be defined by a line connecting centers of adjacent first openings O1.

The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the present disclosure.

Claims (22)

1. A flexible display device, comprising:

a supporting layer having two non-folding regions and a folding region located between the two non-folding regions, wherein the folding region has a central region and two edge regions, each of the edge regions is located between one of the two non-folding regions and the central region, and the aperture ratios of the two edge regions are different from the aperture ratio of the central region; and

a flexible display panel located on the supporting layer.

2. The device of claim 1, wherein an aperture ratio of each of the edge regions is smaller than an aperture ratio of the central region.

3. The device of claim 1, wherein the aperture ratio of the two edge regions gradually increases from the two non-folded regions to the central region.

4. The device of claim 1, wherein the central region has a plurality of first openings, each of the edge regions has a plurality of second openings, the length of the second openings is less than the length of the first openings, and the length of the second openings decreases from the central region to one of the two non-folding regions.

5. The device of claim 1, wherein the central region has a plurality of first openings, each of the edge regions has a plurality of second openings, the width of the second openings is smaller than the width of the first openings, and the width of the second openings decreases from the central region to one of the two non-folding regions.

6. The device of claim 1, wherein the central region has a plurality of first openings, each of the edge regions has a plurality of second openings, and the shapes of the first openings are different from the shapes of the second openings.

7. The device as claimed in claim 6, wherein the first openings are rectangular and the second openings are diamond shaped.

8. The device of claim 1, wherein the central region has a plurality of first openings, each of the edge regions has a plurality of second openings, a distance between two adjacent ones of the second openings along a direction is greater than a distance between two adjacent ones of the first openings along the direction, and the distance between two adjacent ones of the second openings along the direction gradually increases from the central region to one of the two non-folding regions.

9. The device as claimed in claim 8, wherein the folding area has a folding axis, and the direction is perpendicular to the folding axis.

10. The device as claimed in claim 8, wherein the folding area has a folding axis, and the direction is parallel to the folding axis.

11. The device as claimed in claim 1, wherein the two non-folding areas are free of openings.

12. The device of claim 1, wherein the central region has a plurality of first openings, and each of the first openings is staggered with respect to adjacent first openings along a length direction of the supporting layer.

13. The device of claim 1, wherein the central region has a plurality of first openings adjacent to each other, the first openings being arranged in an oblique direction.

14. A flexible display device, comprising:

a support layer having two non-folding regions and a folding region located between the two non-folding regions, wherein the folding region has a bending axis and a plurality of openings, each of the openings having a different dimension in a direction perpendicular to the bending axis; and

a flexible display panel located on the supporting layer.

15. The flexible display device of claim 14, wherein the plurality of openings of the folding area are in a zigzag shape, a cross shape, a diamond shape, or an oval shape.

16. The device as claimed in claim 14, wherein the plurality of openings of the folding area have a main area and an extension area, the length direction of the main area is parallel to the bending axis, and the extension area extends from the main area to a direction perpendicular to the bending axis.

17. The device of claim 16, wherein the extension portion is connected to one end portion or a central portion of the main body portion.

18. The device as claimed in claim 17, wherein two adjacent openings along a direction perpendicular to the bending axis have two corresponding positions, and the extension area connecting the ends of the main body area has a size smaller than a distance between the two corresponding positions.

19. The device of claim 17, wherein the extension portion forms a right angle or an obtuse angle with the end of the main portion.

20. The device as claimed in claim 17, wherein the extension portion connecting the ends of the main body portion is curved or L-shaped.

21. The device as claimed in claim 14, wherein the plurality of openings of the folding area are diamond-shaped, the apex angle of each opening is in the range of 1 to 15 degrees, and the distance between the adjacent openings along the direction perpendicular to the bending axis is in the range of 200 μm to 2 cm.

22. The device as claimed in claim 14, wherein the plurality of openings of the folding area are diamond-shaped, and the distance between two adjacent openings along the direction perpendicular to the bending axis gradually increases from the bending axis to the two non-folding areas.

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