CN111951676B

CN111951676B - Flexible device

Info

Publication number: CN111951676B
Application number: CN202010504346.0A
Authority: CN
Inventors: 徐明樟; 黄子硕; 林志杰
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2019-07-24
Filing date: 2020-06-05
Publication date: 2022-03-25
Anticipated expiration: 2040-06-05
Also published as: CN111951676A

Abstract

A flexible device includes a flexible substrate, a pixel structure, a peripheral trace and a plastic material. The flexible substrate is provided with a display area, a first connecting area, a bendable area, a second connecting area and a peripheral area, the first connecting area, the bendable area and the second connecting area are sequentially arranged between the display area and the peripheral area, and the pixel structure is arranged in the display area. The peripheral wiring is electrically connected to the pixel structure and extends from the display area to the first connection area, the bendable area and the second connection area. The adhesive material is arranged in the bendable area and is not arranged in the first connecting area and the second connecting area. The reference axis is arranged in the bendable region. The flexible substrate is adapted to bend along a reference axis. The thickness of the rubber material is reduced from the first side and the second side of the reference axial reference shaft.

Description

Flexible device

Technical Field

The present invention relates to a flexible device.

Background

With the development of display technologies, the application range of display panels is becoming wider. For example, in the early days, the display panel was mostly used as the screen of electronic devices (e.g. televisions, computers, mobile phones, etc.), and the display panel applied to the electronic devices was mostly a hard display panel; in recent years, display panels have been applied to wearable devices (e.g., watches, clothes, etc.), and most display panels applied to wearable devices are flexible display panels.

The flexible display panel needs to have a certain degree of flexibility. In other words, when the flexible display panel is bent, the components (e.g., peripheral traces, etc.) on the flexible substrate are bent to maintain their normal functions. However, when the flexible display panel is bent, the stress is concentrated on the bending central line, so that the peripheral wires are very easily broken on the bending central line, and the yield and reliability of the flexible display panel are affected.

Disclosure of Invention

The invention aims to provide a flexible device with good performance.

The flexible device of the present invention includes a flexible substrate, a pixel structure, a peripheral trace and a plastic material. The flexible substrate is provided with a display area, a first connecting area, a bendable area, a second connecting area and a peripheral area, wherein the first connecting area, the bendable area and the second connecting area are sequentially arranged between the display area and the peripheral area. The pixel structure is arranged in the display area and is provided with an active element and a pixel electrode electrically connected to the active element. The peripheral wiring is electrically connected to the pixel structure and extends from the display area to the first connection area, the bendable area and the second connection area. The adhesive material is arranged in the bendable area and is not arranged in the first connecting area and the second connecting area. The reference shaft is arranged in the bendable area, the flexible substrate is suitable for being bent along the reference shaft, and the thickness of the rubber material is reduced from the first side and the second side which are opposite to the reference shaft along the reference shaft.

In an embodiment of the invention, the bendable region of the flexible substrate has a first edge and a second edge opposite to each other, the first edge and the second edge are staggered with the reference axis, the glue material has a width in a direction staggered with the reference axis, and the width of the glue material is increased from the inside of the bendable region to the first edge and the second edge.

In an embodiment of the invention, the bendable region of the flexible substrate has a first edge and a second edge opposite to each other, the first edge and the second edge are staggered with the reference axis, the plastic material has a main portion, a first auxiliary portion and a second auxiliary portion, the main portion of the plastic material is disposed inside the bendable region, the first auxiliary portion is disposed between the main portion and the first edge, the second auxiliary portion is disposed between the main portion and the second edge, a width of the main portion is substantially the same, a width of the first auxiliary portion is greater than a width of the main portion and increases as the main portion approaches the first edge, and a width of the second auxiliary portion is greater than a width of the main portion and increases as the second edge approaches the second edge.

In an embodiment of the invention, the rubber material has a total length L in the extending direction of the reference shaft, and the first auxiliary portion of the rubber material has a length L1 in the extending direction of the reference shaft, and 0.1 · L ≦ L1 ≦ 0.25 · L.

In an embodiment of the invention, the second auxiliary portion has a length L2 in the extending direction of the reference axis, and 0.1 · L ≦ L2 ≦ 0.25 · L.

In an embodiment of the invention, the main portion of the rubber material has a width W0 in a direction crossing the reference axis, and the first auxiliary portion has a maximum width W1 in the direction crossing the reference axis, and 0.3 ≦ (W0/W1) ≦ 1.

In an embodiment of the invention, the second auxiliary portion has a maximum width W2 in a direction crossing the reference axis, and 0.3 ≦ (W0/W2) ≦ 1.

In an embodiment of the invention, the flexible device further includes a material layer at least disposed in the bendable region. The peripheral trace is located between the material layer and the flexible substrate. The material layer is provided with a plurality of grooves positioned on the first side and the second side of the reference shaft, the rubber material is arranged on the material layer, and part of the rubber material is filled into the grooves.

In an embodiment of the invention, the material layer located in the bendable region has a convex surface, the first tangent plane is tangent to the surface and passes through the reference axis, the second tangent plane is tangent to the surface and passes through one of the plurality of grooves, a normal of the first tangent plane and a normal of the second tangent plane have a crossing point, the crossing point has a distance r from the reference axis, and a width of the glue material in a direction crossing the reference axis is between 0.3 rr and rr.

In one embodiment of the present invention, the material layer in the bendable region has a convex surface, a first tangent plane is tangent to the surface and passes through the reference axis, a second tangent plane is tangent to the surface and passes through one of the plurality of grooves, and a normal of the first tangent plane and a normal of the second tangent plane have an included angle θ, and θ is greater than or equal to 30 ° and less than or equal to 85 °.

In an embodiment of the invention, the plurality of grooves includes a plurality of first grooves disposed on a first side of the reference axis, and a depth of the first grooves increases with distance from the reference axis.

In an embodiment of the invention, the plurality of grooves further includes a plurality of second grooves disposed on a second side of the reference axis, and a depth of the second grooves increases with distance from the reference axis.

Drawings

Fig. 1 is a side view of a flexible device according to an embodiment of the invention.

Fig. 2 is a schematic front view of a flexible device according to an embodiment of the invention.

Fig. 3 is a schematic cross-sectional view illustrating a flexible device according to an embodiment of the invention.

Fig. 4 is a schematic cross-sectional view illustrating a pixel array substrate of a flexible device according to an embodiment of the invention.

FIG. 5 is a schematic side view of a flexible device according to an embodiment of the invention.

Fig. 6 is a schematic front view of a flexible device according to an embodiment of the invention.

Fig. 7 is a schematic cross-sectional view illustrating a flexible device according to an embodiment of the invention.

Fig. 8 is a schematic cross-sectional view illustrating a pixel array substrate of a flexible device according to an embodiment of the invention.

The reference numbers are as follows:

10. 10A Flexible device

100 pixel array substrate

110 flexible substrate

110a back side

111 display area

112 first connection region

113 bendable region

113a first edge

113b second edge

114 second connecting area

115 peripheral area

120 semiconductor pattern

130 gate insulating layer

140 grid electrode

151 source electrode

152 drain electrode

153 peripheral wiring

160 pixel electrode

170 material layer

170a front side

170b surface

172. 174 groove

172-1, 172-2, 172-3 first grooves

174-1, 174-2 and 174-3 second grooves

180: bonding pad

200 is a rubber material

210 main portion

220 first auxiliary part

230 second auxiliary part

300 protective film

400 driving element

500 polarizer

A is width

B is the distance between

C is depth

H is thickness

K1, K2 regions

L total length

L1, L2 Length

N1, N2 normal

O is the point of intersection

PX pixel structure

P1 first tangent plane

P2 second tangent plane

r is distance

S1 first side

S2 second side

T active element

W0, W1, W2 Width

X is the reference axis

x, y, z, d directions

I-I ', II-II': line segment

Angle of theta

Detailed Description

Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to physical and/or electrical connections. Further, "electrically connected" or "coupled" may mean that there are additional elements between the elements.

As used herein, "about", "approximately" or "substantially" includes the stated value and the average value within an acceptable range of deviation of the specified value as determined by one of ordinary skill in the art, taking into account the measurement in question and the specified amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" may mean within one or more standard deviations of the stated value, or within ± 30%, ± 20%, ± 10%, ± 5%. Further, as used herein, "about", "approximately" or "substantially" may be selected based on optical properties, etch properties, or other properties, with a more acceptable range of deviation or standard deviation, and not all properties may be applied with one standard deviation.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Fig. 1 is a side view of a flexible device 10 according to an embodiment of the invention. Fig. 2 is a schematic front view of a flexible device 10 according to an embodiment of the invention. Fig. 3 is a cross-sectional view of a flexible device 10 according to an embodiment of the invention. In particular, fig. 3 corresponds to the line i-i' of fig. 2 and the area K1 of fig. 1.

For clarity, the directions x, y and z are perpendicular to each other in fig. 1, 2 and 3.

Fig. 4 is a cross-sectional view of a pixel array substrate 100 of a flexible device 10 according to an embodiment of the invention. It should be noted that fig. 1, 2 and 3 show a state where the flexible device 10 is bent, and fig. 4 shows a state where the flexible device 10 is not bent. The structure of the flexible device 10 will be described below with reference to fig. 1, 2, 3, and 4.

Referring to fig. 1 and 4, the flexible device 10 includes a pixel array substrate 100. The pixel array substrate 100 includes a flexible substrate 110. The flexible substrate 110 has a display region 111, a first connection region 112, a bendable region 113, a second connection region 114, and a peripheral region 115, wherein the first connection region 112, the bendable region 113, and the second connection region 114 are sequentially disposed between the display region 111 and the peripheral region 115.

The display region 111 refers to a region where the pixel structure PX is disposed. The peripheral region 115 is an area where the pad 180 is disposed, wherein the pad 180 is electrically connected to the peripheral trace 153 and is used for being connected to the driving device 400, so that the driving device 400 can drive the pixel structure PX through the peripheral trace 153. The bendable region 113 is a region where the peripheral trace 153 is disposed and is bent. The first connecting region 112 is connected between the display region 111 and the bendable region 113. In the embodiment, the first connection region 112 is not bent substantially, and the first connection region 112 and the display region 111 are substantially connected to form a flat plate, but the invention is not limited thereto. The second connecting region 114 is a region connected between the bendable region 113 and the peripheral region 115. In the embodiment, the second connection region 114 is not substantially bent, and the second connection region 114 and the peripheral region 115 are substantially connected to form a flat plate, but the invention is not limited thereto.

In this embodiment, the flexible device 10 may further include a protective film 300 disposed on the back surface 110a of the pixel array substrate 100. The protective film 300 covers the display region 111 and the peripheral region 115, but does not cover the first connection region 112, the bendable region 113 and the second connection region 114. In this embodiment, the flexible device 10 may further optionally include a polarizer 500 disposed on the front surface 170a of the pixel array substrate 100. The polarizer 500 covers the display region 111, but does not cover the first connecting region 112, the bendable region 113, the second connecting region 114, and the peripheral region 115.

For example, in the present embodiment, the flexible substrate 110 may be made of organic polymers, such as: polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), Polycarbonate (PC), Polyethersulfone (PES), or polyarylate (a combination of at least two of the foregoing materials).

Referring to fig. 4, the pixel array substrate 100 further includes a pixel structure PX disposed in the display region 111 of the flexible substrate 110 and having an active device T and a pixel electrode 160 electrically connected to the active device T. For example, in the present embodiment, the active device T includes a thin film transistor having a gate electrode 140, a semiconductor pattern 120, a gate insulating layer 130, a source electrode 151 and a drain electrode 152, wherein the gate insulating layer 130 is disposed between the gate electrode 140 and the semiconductor pattern 120, the source electrode 151 and the drain electrode 152 are respectively electrically connected to two regions of the semiconductor pattern 120, and the pixel electrode 160 is electrically connected to the drain electrode 152 of the thin film transistor.

The pixel array substrate 100 further includes a peripheral trace 153 electrically connected to the pixel structure PX and extending from the display region 111 to the first connection region 112, the bendable region 113 and the second connection region 114. The peripheral trace 153 may also be referred to as a fan-out trace. In the present embodiment, the peripheral trace 153 may use a metal material, an alloy, a nitride of a metal material, an oxide of a metal material, an oxynitride of a metal material, other conductive materials, or a stacked layer of at least two of the above materials.

Referring to fig. 1, 2, 3 and 4, the flexible device 10 further includes a cured adhesive 200 disposed in the bendable region 113 of the pixel array substrate 100 and not disposed in the first connection region 112 and the second connection region 114, wherein the reference axis X is disposed in the bendable region 113, the flexible substrate 110 is adapted to be bent along the reference axis X, and the thickness H of the adhesive 200 is reduced from the reference axis X to the first side S1 and the second side S2 opposite to the reference axis X. That is, the rubber material 200 has the maximum thickness H on the reference axis X; the thickness H of the adhesive material 200 is thinner as the first connection region 112 and the second connection region 114 are closer.

It should be noted that the surface 170b of the bent portion of the pixel array substrate 100 can be similar to a portion of the surface of a cylinder by disposing the adhesive material 200 on the bending center line (i.e., the reference axis X) of the bendable region 113 and reducing the thickness H of the adhesive material 200 from the bending center line to two sides of the bending center line. Therefore, the stress applied to the peripheral trace 153 corresponding to the bending center line (i.e., the reference axis X) is reduced, and the peripheral trace is not easily broken (crack).

The flexible device (not shown) of the first comparative example is similar to the flexible device 10 of the present embodiment, and the difference between the flexible device of the first comparative example and the flexible device 10 of the present embodiment is only that the flexible device of the first comparative example does not include the rubber material 200 of the flexible device 10 of the present embodiment.

The flexible device (not shown) of the second comparative example is similar to the flexible device 10 of the present embodiment. The flexible device of the second comparative example also has a rubber material disposed in the bendable region but not disposed in the first connection region and the second connection region. The difference between the flexible device of the second comparative example and the flexible device 10 of the present embodiment is only that the thickness of the entire adhesive material of the flexible device of the second comparative example is consistent.

According to a simulation result, the stress applied to the peripheral trace of the flexible device of the first comparative example at the bending center line is 288MPa, the stress applied to the peripheral trace of the flexible device of the second comparative example at the bending center line is 286MPa, and the stress applied to the peripheral trace of the flexible device of the present embodiment at the bending center line is 260 MPa. Compared with the first comparative example, the stress applied to the peripheral trace 153 of the second comparative example at the bending center line is only reduced by 0.7%, but the stress applied to the peripheral trace 153 of the present embodiment at the bending center line is significantly reduced by 10%.

Therefore, it can be confirmed that, by disposing the adhesive material 200 on the bending center line (i.e. the reference axis X) of the bendable region 113 and reducing the thickness H of the adhesive material 200 from the bending center line to two sides of the bending center line, the stress on the peripheral trace 153 at the bending center line is reduced, and the peripheral trace is not easily broken (crack), thereby improving the yield and reliability of the flexible device 10.

In the present embodiment, the adhesive material 200 has a high hardness, and the adhesive material 200 preferably has a high young's modulus. For example, in the present embodiment, the Young's modulus (Young's modulus) of the glue material 200 may be between 0.5GPa and 2.5GPa, such as but not limited to 1.75 GPa. The following table shows the maximum thickness H of the adhesive material 200 and the stress applied to the peripheral trace 153 at the reference axis X according to an embodiment of the invention. Referring to the following table one, when the maximum thickness H of the adhesive material 200 is increased to 100 μm, the stress applied to the peripheral trace 153 at the reference axis X is obviously increased to 361 MPa. Therefore, in the present embodiment, the maximum thickness H of the rubber material 200 is preferably greater than or equal to 10 μm and less than 100 μm. However, the invention is not limited thereto, and the appropriate range of the maximum thickness H of the rubber material 200 is related to the young's modulus of the rubber material 200 itself, and the invention is not limited thereto.

In the present embodiment, the material of the glue material 200 may include acryl series, epoxy resin, or other suitable materials.

Referring to fig. 1 and 2, the bendable region 113 of the flexible substrate 110 has a first edge 113a and a second edge 113b opposite to each other, wherein the first edge 113a and the second edge 113b are staggered with respect to the reference axis X. In the present embodiment, the plastic material 200 has a main portion 210, a first auxiliary portion 220 and a second auxiliary portion 230, the main portion 210 of the plastic material 200 is disposed inside the bendable region 113, the first auxiliary portion 220 is disposed between the main portion 210 and the first edge 113a, the second auxiliary portion 230 is disposed between the main portion 210 and the second edge 113b, a width W0 of the main portion 210 is substantially uniform, a width W1 of the first auxiliary portion 220 is greater than a width W0 of the main portion 210 and increases as approaching the first edge 113a, and a width W2 of the second auxiliary portion 230 is greater than a width W0 of the main portion 210 and increases as approaching the second edge 113 b. In short, in the present embodiment, the vertical projection of the glue material 200 on the flexible substrate 110 may be the vertical projection of two speakers whose narrow portions are connected and mirror-reflected to each other.

For example, in the embodiment, the rubber material 200 has a total length L in the extending direction X of the reference axis X, the first auxiliary portion 220 of the rubber material 200 has a length L1 in the extending direction X of the reference axis X, and 0.1 · L ≦ L1 ≦ 0.25 · L; the second auxiliary portion 230 of the rubber material 200 has a length L2 in the extending direction X of the reference axis X, and 0.1 · L ≦ L2 ≦ 0.25 · L.

For example, in the present embodiment, the main portion 210 of the rubber material 200 has a width W0 in a direction d intersecting the reference axis X, and the first auxiliary portion 220 has a maximum width W1 in the direction d intersecting the reference axis X, and 0.3 ≦ W0/W1 ≦ 1. The second auxiliary portion 230 has a maximum width W2 in the direction d intersecting the reference axis X, and 0.3 ≦ (W0/W2) ≦ 1.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, in the present embodiment, the flexible device 10 further includes a material layer 170 at least disposed in the bendable region 113. The peripheral trace 153 is located between the material layer 170 and the flexible substrate 110. In particular, the material layer 170 has a plurality of

grooves

172 and 174 located on the first side S1 and the second side S2 of the reference axis X, the glue material 200 is disposed on the material layer 170, and a portion of the glue material 200 fills the plurality of

grooves

172 and 174.

The

grooves

172 and 174 are used to limit the distribution range of the rubber material 200 during the formation process of the rubber material 200, so that the rubber material 200 is formed in a designated area. In addition, by the arrangement of the

grooves

172 and 174, a part of the glue material 200 is sunk into the

grooves

172 and 174 at a position far away from the reference axis X, so that the glue material 200 with the thickness H decreasing from the reference axis X to the first side S1 and the second side S2 opposite to the reference axis X is easier to form.

In the present embodiment, the material layer 170 is, for example, a dielectric layer, such as a pixel defining layer, disposed on the pixel electrode 160 of the pixel structure PX. In this embodiment, the material layer 170 may be an organic insulating layer. However, the invention is not limited thereto, and any film layer with sufficient thickness that is disposed on the peripheral trace 153 can be used as the material layer 170. For example, in another embodiment not shown, a touch substrate (not shown) may be disposed on the pixel array substrate 100, and a base of the touch substrate may also be used as the material layer 170; that is, the back surface of the base of the touch substrate may have the

grooves

172 and 174, and the adhesive material 200 may also be disposed on the back surface of the base of the touch substrate.

Referring to fig. 3 and 4, in the present embodiment, the material layer 170 located in the bendable region 113 has a convex surface 170 b. Referring to fig. 3, the first tangential plane P1 is tangent to the surface 170b and passes through the reference axis X, the second tangential plane P2 is tangent to the surface 170b and passes through a groove 174, a normal N1 of the first tangential plane P1 and a normal N2 of the second tangential plane P2 have an intersection O, the intersection O has a distance r from the reference axis X, and widths W0, W1, W2 of the adhesive 200 in a direction d intersecting the reference axis X are between 0.3 rr and rr. From another perspective, in the present embodiment, the normal N1 of the first tangential plane P1 forms an angle θ with the normal N2 of the second tangential plane P2, and 30 ° ≦ θ ≦ 85 °.

It should be noted that the following embodiments follow the reference numerals and parts of the contents of the foregoing embodiments, wherein the same reference numerals are used to indicate the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted portions, reference may be made to the foregoing embodiments, which will not be repeated below.

Fig. 5 is a side view of a flexible device 10A according to an embodiment of the invention. Fig. 6 is a schematic front view of a flexible device 10A according to an embodiment of the invention. Fig. 7 is a cross-sectional view of a flexible device 10A according to an embodiment of the invention. In particular, fig. 7 corresponds to the line II-II' of fig. 6 and the region K2 of fig. 5.

For clarity, the directions x, y and z are perpendicular to each other in fig. 5, 6 and 7.

Fig. 8 is a cross-sectional view of a pixel array substrate 100 of a flexible device 10A according to an embodiment of the invention. It should be noted that fig. 5, 6 and 7 show a state where the flexible device 10 is bent, and fig. 8 shows a state where the flexible device 10 is not bent. The structure of the flexible device 10A will be described below with reference to fig. 5, 6, 7, and 8.

Referring to fig. 5, 6, 7 and 8, a flexible device 10A of the present embodiment is similar to the flexible device 10 described above, and the difference between the two embodiments is that in the present embodiment, the plurality of

grooves

172 and 174 includes a plurality of first grooves 172-1, 172-2 and 172-3 and a plurality of second grooves 174-1, 174-2 and 174-3 respectively disposed on the first side S1 and the second side S2 of the reference axis X; in particular, the depth C of the first plurality of recesses 172-1, 172-2, 172-3 increases away from the reference axis X, and the depth C of the second plurality of recesses 174-1, 174-2, 174-3 increases away from the reference axis X.

The first grooves 172-1, 172-2, 172-3 and the second grooves 174-1, 174-2, 174-3 with the gradually changing depth C help to form the adhesive material 200 with the thickness H decreasing from the reference axis X to the first side S1 and the second side S2 opposite to the reference axis X.

For example, in the present embodiment, the depth C of the first recesses 172-1, 172-2, 172-3 and the depth C of the second recesses 174-1, 174-2, 174-3 may be between 1 μm and 10 μm; the width A of the first grooves 172-1, 172-2, 172-3 and the second grooves 174-1, 174-2, 174-3 in the direction d may be between 10 μm and 100 μm; the pitch B of the plurality of first recesses 172-1, 172-2, 172-3 in the direction d and the pitch B of the second recesses 174-1, 174-2, 174-3 in the direction d may be between 10 μm and 100 μm; however, the present invention is not limited thereto.

Claims

1. A flexible device, comprising:

a flexible substrate having a display region, a first connection region, a bendable region, a second connection region and a peripheral region, wherein the first connection region, the bendable region and the second connection region are sequentially disposed between the display region and the peripheral region;

the pixel structure is arranged in the display area and is provided with an active element and a pixel electrode which is electrically connected to the active element;

a peripheral wire electrically connected to the pixel structure and extending from the display region to the first connection region, the bendable region and the second connection region; and

the flexible substrate is suitable for bending along the reference shaft, and the thickness of the rubber material is reduced from a first side and a second side which are opposite to the reference shaft;

the bendable region of the flexible substrate has a first edge and a second edge opposite to each other, the first edge and the second edge are staggered with the reference axis, the glue material has a width in the direction staggered with the reference axis, and the width of the glue material is increased from the inner part of the bendable region to the first edge and the second edge.

2. A flexible device, comprising:

the bendable region of the flexible substrate is provided with a first edge and a second edge which are opposite, the first edge and the second edge are staggered with the reference axis, the rubber material is provided with a main part, a first auxiliary part and a second auxiliary part, the main part of the rubber material is arranged inside the bendable region, the first auxiliary part is arranged between the main part and the first edge, the second auxiliary part is arranged between the main part and the second edge, the width of the main part is substantially consistent, the width of the first auxiliary part is larger than the width of the main part and is increased along with the increase of the width of the main part approaching the first edge, and the width of the second auxiliary part is larger than the width of the main part and is increased along with the increase of the width of the second auxiliary part approaching the second edge.

3. The flexible device as claimed in claim 2, wherein the rubber material has a total length L in an extending direction of the reference axis, the first auxiliary portion of the rubber material has a length L1 in the extending direction of the reference axis, and 0.1-L ≦ L1 ≦ 0.25-L.

4. The flexible device as claimed in claim 3, wherein the second auxiliary portion has a length L2 in the extending direction of the reference axis and 0.1-L2-0.25-L.

5. The flexible device as claimed in claim 2, wherein the main portion of the adhesive has a width W0 in a direction crossing the reference axis, and the first auxiliary portion has a maximum width W1 in the direction crossing the reference axis, and 0.3 ≦ (W0/W1) ≦ 1.

6. The flexible device of claim 5, wherein the second auxiliary portion has a maximum width W2 in the direction that intersects the reference axis and 0.3 ≦ (W0/W2) ≦ 1.

7. A flexible device, comprising:

a material layer at least disposed in the bendable region, wherein the peripheral trace is disposed between the material layer and the flexible substrate, the material layer has a plurality of grooves disposed on the first side and the second side of the reference axis, the adhesive is disposed on the material layer, and a portion of the adhesive fills the plurality of grooves.

8. The flexible device as claimed in claim 7, wherein the material layer in the bendable region has a convex surface, a first tangent plane is tangent to the surface and passes through the reference axis, a second tangent plane is tangent to the surface and passes through one of the plurality of grooves, a normal of the first tangent plane and a normal of the second tangent plane have an intersection point, the intersection point has a distance r from the reference axis, and a width of the adhesive in a direction crossing the reference axis is between 0.3 rr and rr.

9. The flexible device as claimed in claim 7, wherein the material layer in the bendable region has a convex surface, a first tangent plane is tangent to the surface and passes through the reference axis, a second tangent plane is tangent to the surface and passes through one of the plurality of grooves, a normal of the first tangent plane and a normal of the second tangent plane have an included angle θ, and θ is greater than or equal to 30 ° and less than or equal to 85 °.

10. The flexible device of claim 7, wherein the plurality of grooves includes a plurality of first grooves disposed on the first side of the reference axis, and a depth of the plurality of first grooves increases with distance from the reference axis.

11. The flexible device of claim 10, wherein the plurality of grooves further comprises a plurality of second grooves disposed on the second side of the reference axis, and a depth of the plurality of second grooves increases with distance from the reference axis.