CN113066362B

CN113066362B - Supporting plate, manufacturing method thereof and flexible display device

Info

Publication number: CN113066362B
Application number: CN202110245104.9A
Authority: CN
Inventors: 陈荣坤
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2022-09-27
Anticipated expiration: 2041-03-05
Also published as: CN113066362A

Abstract

The embodiment of the application discloses a supporting plate, a manufacturing method of the supporting plate and a flexible display device. The flexible substrate is characterized in that a groove structure is arranged on the hard substrate, the bonding adhesive layer is arranged on the hard substrate, the flexible layer is arranged on one side, away from the hard substrate, of the bonding adhesive layer, the flexible layer is close to one side, close to the hard substrate, of the hard substrate, a protruding structure is arranged, and the protruding structure corresponds to the groove structure. Wherein, part of the adhesive layer is positioned in the groove structure. The application can guarantee the smoothness of the flexible layer after being attached to the hard substrate, and one side of the flexible layer away from the hard substrate is prevented from generating marks.

Description

Supporting plate, manufacturing method thereof and flexible display device

Technical Field

The application relates to the technical field of display, in particular to a supporting plate, a manufacturing method thereof and a flexible display device.

Background

In recent years, flexible display panels have attracted much attention because of their unique bending and folding characteristics. As the bending radius of the flexible display panel becomes smaller, the flexible display panel tends to be thinner and thinner in order to facilitate a bending or unbending operation.

However, as the flexible display panel is thinned, its mechanical properties and recovery properties are inevitably lowered. Therefore, the prior art generally provides a support plate on the back of the flexible display panel to provide support for the flexible display panel. In order to guarantee flexible display panel's resistant bending nature, can set up hollow out pattern in the backup pad usually for the flexible layer of backup pad top warp at the laminating in-process, and then the impression appears in the one side that leads to the flexible layer to keep away from the backup pad.

Disclosure of Invention

The application provides a supporting plate, a manufacturing method of the supporting plate and a flexible display device, and aims to solve the technical problem that in the prior art, a flexible layer above the supporting plate deforms in a fitting process, and then one side, far away from the supporting plate, of the flexible layer is marked.

The application provides a backup pad, it includes:

the hard substrate is provided with a groove structure;

the adhesive glue layer is arranged on the hard substrate; and

the flexible layer is arranged on one side, far away from the hard substrate, of the adhesive layer, a protruding structure is arranged on one side, close to the hard substrate, of the flexible layer, and the protruding structure and the groove structure are arranged correspondingly;

wherein, part of the adhesive layer is positioned in the groove structure.

In the backup pad that this application provided, groove structure includes a plurality of recesses that are the array and arrange, protruding structure includes a plurality of bellying that are the array and arrange, the bellying with recess one-to-one sets up.

In the support plate provided by the application, the projection of each protruding part on the hard substrate is positioned in the corresponding groove.

In the support plate provided by the application, in the direction perpendicular to the hard substrate, the thickness of the protruding part is greater than or equal to the thickness of the adhesive glue layer.

In the support plate provided by the application, the cross-sectional structure of the protruding part is rectangular, inverted trapezoid or inverted triangle.

In the support plate provided by the application, the support plate is provided with at least one bending area, and the groove structure is located in the bending area.

In the support plate provided by the application, the thickness of the hard substrate is 100 to 150 micrometers, the thickness of the flexible layer is 80 to 120 micrometers, and the thickness of the adhesive glue layer is 20 to 30 micrometers.

Correspondingly, the application provides a manufacturing method of a support plate, which comprises the following steps:

providing a hard substrate, wherein a groove structure is arranged on the hard substrate;

forming an adhesive layer on the hard substrate;

the flexible layer is attached to one side, far away from the hard substrate, of the bonding glue layer, the flexible layer is close to one side of the hard substrate and is provided with a protruding structure, the protruding structure corresponds to the groove structure, and the protruding structure partially extrudes the bonding glue layer into the groove structure.

In the manufacturing method of the support plate provided by the application, the flexible layer is made of foam, and the step of attaching the flexible layer to the side of the adhesive layer away from the hard substrate further comprises the following steps:

forming a foam material layer on the substrate;

drying the foam material layer;

arranging a foam mould on one side of the foam material layer, which is far away from the substrate, wherein a groove pattern is arranged on one side of the foam mould, which is close to the substrate, and the groove pattern has the same structure as the groove;

foaming the foam material layer to form the flexible layer with the convex structure.

The application also provides a display panel, one side that display panel deviates from the plain noodles is provided with a backup pad, the backup pad is above-mentioned arbitrary backup pad.

The application provides a supporting plate, a manufacturing method thereof and a flexible display device. Wherein, be provided with groove structure on the stereoplasm base plate. This application is through setting up the flexible layer on the stereoplasm base plate, and the flexible layer is close to one side of stereoplasm base plate sets up protruding structure, just protruding structure with groove structure corresponds the setting, protruding structure will be partial the bonding glue film extrudees extremely in the groove structure to guarantee the planarization behind flexible layer and the laminating of stereoplasm base plate, avoid the flexible layer to keep away from the impression to appear in one side of stereoplasm base plate.

Drawings

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

FIG. 1 is a schematic view of a first configuration of a support plate provided herein;

FIG. 2 is a schematic plan view of a hard substrate provided herein;

FIG. 3 is a schematic view of a first structure of a flexible layer provided herein;

FIG. 4 is a schematic view of a second construction of a flexible layer provided herein;

FIG. 5 is a schematic view of a third construction of a flexible layer provided herein;

FIG. 6 is a second structural schematic of the support plate provided herein;

FIG. 7 is a third structural schematic of a support plate provided herein;

FIG. 8 is a first schematic flow chart of a method for fabricating a support plate provided herein;

FIG. 9 is a second schematic flow chart of a method of making a support plate provided herein;

FIGS. 10A-10D are schematic views of structures obtained in the method of making the support plate shown in FIG. 9;

fig. 11 is a schematic structural diagram of a flexible display panel provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In this application, where the context requires otherwise, the words "upper" and "lower" used in relation to the device in use or operation will generally refer to the upper and lower extremities of the device, particularly as oriented in the drawing figures; while "inner" and "outer" are with respect to the outline of the device.

Referring to fig. 1, fig. 1 is a schematic view of a first structure of a support plate provided in the present application. As shown in fig. 1, a support plate 100 provided in the embodiment of the present application includes a rigid substrate 10, an adhesive glue layer 20, and a flexible layer 30.

Wherein, a groove structure 11 is arranged on the hard substrate 10. The hard substrate 10 has high rigidity. The hard substrate 10 may be made of stainless steel.

Wherein the adhesive layer 20 is disposed on the rigid substrate 10. The material of the adhesive glue layer 20 is a liquid optical glue. The material of the adhesive layer 20 may be other adhesive materials with good adhesion and light transmission, and the application is not limited thereto.

Wherein the flexible layer 30 is disposed on a side of the adhesive glue layer 20 away from the rigid substrate 10. The flexible layer 30 may act as a cushion to improve the flex resistance and impact resistance of the support plate 100. The side of the flexible layer 30 close to the rigid substrate 10 is provided with a raised structure 31. The protrusion structures 31 are disposed corresponding to the groove structures 11.

It can be understood that, since the side of the flexible layer 30 close to the rigid substrate 10 is provided with the protruding structures 31 corresponding to the groove structures 11, the protruding structures 31 generate a squeezing action on the adhesive glue layer 20, so that part of the adhesive glue layer 20 is filled in the groove structures 11, thereby providing a certain deformation amount. Furthermore, the protruding structures 31 provide a certain supporting and cushioning effect while pressing a portion of the adhesive layer 20 into the recessed structures 11, so as to avoid marking on the side of the flexible layer 30 away from the rigid substrate 10.

The embodiment of the present application provides a supporting plate 100, where the supporting plate 100 includes a rigid substrate 10, an adhesive layer 20, and a flexible layer 30, which are stacked. Wherein, a groove structure 11 is arranged on the hard substrate 10. This application embodiment sets up protruding structure 31 through being close to one side of stereoplasm base plate 10 at flexible layer 30, and protruding structure 31 corresponds the setting with groove structure 11 for protruding structure 31 can extrude partial bonding glue film 20 to groove structure 11 in, has guaranteed the planarization after flexible layer 30 and the laminating of stereoplasm base plate 10, has avoided the impression to appear in one side that flexible layer 30 kept away from stereoplasm base plate 10.

In the present embodiment, the thickness of the hard substrate 10 is 100 to 150 micrometers. The flexible layer 30 has a thickness of 80 to 120 microns. The adhesive glue layer 20 has a thickness of 20 to 30 micrometers. For example, in one embodiment, the thickness of the rigid substrate 10 is 120 microns, the thickness of the adhesive glue layer 20 is 25 microns, and the thickness of the flexible layer 30 is 100 microns. The thickness range is set to achieve both the thinning of the support plate 100 and the rigidity of the support plate 100.

In the present embodiment, the supporting plate 100 has at least one bending region 100A. The groove structure 11 is located in the bending region 100A. The number of the bending regions 100A may be designed according to the function of the device attached and bonded to the support plate 100, which is not specifically limited in this application. For example, in some embodiments, the support plate 100 may include one inflection zone 100A, two inflection zones 100A, or 3 inflection zones 100A.

In the present embodiment, the groove structure 11 may include a plurality of grooves 110. Each groove 110 extends through the rigid substrate 10. The groove structure 11 improves the flexibility of the hard substrate 10. When the supporting plate 100 is bent, the groove structure 11 can release stress generated by bending, so as to prevent the supporting plate 100 from being broken, or prevent the hard substrate 10 and the adhesive layer 20 from falling off.

The cross-sectional structure of each groove 110 may be rectangular, trapezoidal, triangular, or semicircular, which is not limited in this application.

In the present embodiment, the protruding structure 31 includes a plurality of protruding portions 310. The protrusions 310 are disposed in one-to-one correspondence with the grooves 110.

In an embodiment of the present application, please refer to fig. 2, and fig. 2 is a schematic plan view illustrating a hard substrate provided in the present application. In the embodiment of the present application, the groove structure 11 includes a plurality of grooves 110 arranged in an array. The planar structure of the recess 110 is rectangular. The groove 110 penetrates the hard substrate 10.

Specifically, the length of the first side a of the groove 110 is 3.5 mm to 4.5 mm. The second side b of the groove 110 has a length of 0.15 mm to 0.25 mm. The distance c between two adjacent grooves 110 is 0.35 mm to 0.45 mm in the row direction X. The array of grooves 11 provides the support plate 100 with better bending resistance.

Accordingly, the protrusion structure 31 includes a plurality of protrusions 310 arranged in an array. The protrusions 310 correspond to the grooves 110 one to one. The projection of each protrusion 310 on the rigid substrate 10 is located in the corresponding groove 110.

It can be understood that the protrusions 310 are disposed in a one-to-one correspondence with the grooves 110, so that the protrusions 310 can jack up the adhesive layer 20 at the corresponding grooves 110, so that the adhesive layer 20 is filled into the corresponding grooves 110, thereby achieving a good buffering effect and avoiding the occurrence of marks on the side of the flexible layer 30 away from the hard substrate 10. In addition, the projections of the protrusions 310 on the rigid substrate 10 are located in the corresponding grooves 110, so that the protrusions 310 can be prevented from pressing the adhesive layer 20 to the area between two adjacent grooves 110, and further the adhesive layer 20 is prevented from being wrinkled.

In the embodiment of the present application, the cross-sectional structure of each protrusion 310 is rectangular, as shown in fig. 3. In another embodiment of the present application, the cross-sectional structure of each protrusion 310 is an inverted trapezoid, as shown in fig. 4. In another embodiment of the present application, the cross-sectional structure of each protrusion 310 is an inverted triangle, as shown in fig. 5.

It can be understood that the configuration of the protruding portion 310 with the inverted trapezoid or inverted triangle section increases the penetrating power of the protruding portion 310, so that the protruding portion 310 can more easily press the adhesive layer 20 into the corresponding groove 110, thereby providing a larger deformation amount. In addition, in the direction Y perpendicular to the supporting plate 100, when the thickness of the protruding portion 310 is greater than the thickness of the adhesive layer 20 and the external pressure acting on the supporting plate 100 is greater, the protruding portion 310 is more easily inserted into the corresponding groove 110, so as to prevent the protruding portion 310 from deforming and prevent the flexible layer 30 from being uneven on the side away from the rigid substrate 10.

In the present embodiment, the flexible layer 30 is made of foam. The foam is generally foamed by using polyurethane as a main raw material.

Specifically, the foam is a high molecular polymer with a plurality of cells, and the foam can be classified according to the structure of the cells. The foam with the foam holes not communicated with each other is closed-cell foam. The foam which is communicated with the foam holes is open-cell foam. The foam with mutually communicated foam holes and foam holes which are not mutually communicated is semi-open-cell foam.

In the present embodiment, the foam of the flexible layer 30 is not limited, and may be, for example, open-cell foam, semi-open-cell foam, or closed-cell foam. The flexible layer 30 may be formed from one or more layers of foam. The joint surfaces between the adjacent foam can adopt seamless splicing and are bonded together by glue.

In the embodiment of the present application, with reference to fig. 1, in the direction Y perpendicular to the rigid substrate 10, the thickness of the protruding portion 310 is equal to the thickness of the adhesive layer 20. When the external pressure is smaller, the thickness of the protruding portion 310 is equal to the thickness of the adhesive layer 20, so that the protruding portion 310 can effectively press the adhesive layer 20 into the groove structure 11, and further provide enough deformation, and the impression on the side of the flexible layer 30 away from the hard substrate 10 is avoided.

In another embodiment of the present application, please refer to fig. 6, wherein fig. 6 is a second structural diagram of the supporting plate provided in the present application. The difference from the support plate 100 shown in fig. 1 is that, in the support plate 100 provided in the embodiment of the present application, the thickness of the protruding portion 310 is greater than the thickness of the adhesive glue layer 20 in the direction Y perpendicular to the support plate 100.

Specifically, when the external pressure applied to the support plate 100 is greater, the protrusion 310 may penetrate through the adhesive layer 20 and fill the inside of the groove 110, so as to provide more deformation, reduce the compressive stress, and further avoid the impression on the side of the flexible layer 30 away from the rigid substrate 10.

Referring to fig. 7, fig. 7 is a schematic view of a third structure of a supporting plate according to the present application. The difference from the support plate 100 shown in fig. 1 is that the support plate 100 provided in the embodiment of the present application further includes an adhesive layer 40 and a release paper 50.

Specifically, the adhesive layer 40 is disposed on a side of the flexible layer 30 away from the rigid substrate 10. The release paper 50 is disposed on a side of the adhesive layer 40 away from the rigid substrate 10.

The material of the adhesive layer 40 may be a liquid optical adhesive. The material of the adhesive layer 40 may be other adhesive materials having good adhesiveness and light transmittance. The release paper 50 is attached to the adhesive layer 40 to protect the product from moisture and oil. When the support plate 100 is attached to the surface of a device such as a flexible display panel, the release paper 50 may be removed, so that the support plate 100 is attached to the flexible display panel through the attachment glue layer 40.

Correspondingly, the application also provides a manufacturing method of the supporting plate. Specifically, please refer to fig. 1 and 8. Fig. 8 is a first flowchart of a method for manufacturing a support plate according to the present disclosure. Specifically, the manufacturing method of the supporting plate 100 includes the following steps:

101. providing a hard substrate, wherein a groove structure is arranged on the hard substrate.

Wherein, the thickness of the hard substrate 10 is 100 to 150 microns. The hard substrate 10 has a strong rigidity. The rigid substrate 10 may be made of stainless steel. The groove structure 11 may comprise a plurality of grooves 110. Each groove 110 extends through the rigid substrate 10. The groove structure 11 improves the flexibility of the hard substrate 10.

The groove structure 11 may be formed on the hard substrate 10 by a laser etching process, a wet etching process, or the like.

Wherein, the supporting plate 100 may include at least one bending region 100A. The portion of the rigid substrate 10 corresponding to each bending region 100A is provided with a groove structure 11.

102. And forming an adhesive layer on the hard substrate.

Specifically, an adhesive layer 20 is coated on the rigid substrate 10. The thickness of the adhesive glue layer 20 is 20 to 30 micrometers. The material of the adhesive glue layer 20 may be a liquid optical glue. The material of the adhesive layer 20 may be other adhesive materials having good adhesiveness and light transmittance.

103. The flexible layer is attached to one side, away from the hard substrate, of the bonding adhesive layer, the flexible layer is close to one side of the hard substrate and provided with a protruding structure, the protruding structure corresponds to the groove structure in set, and the protruding structure partially extrudes the bonding adhesive layer to the inside of the groove structure.

Specifically, the flexible layer 30 is attached to the side of the adhesive layer 20 away from the rigid substrate 10. Then, the flexible layer 30 is closely attached to the hard substrate 10 by pressing.

Wherein the protruding structure 31 includes a plurality of protruding portions 310. The protrusions 310 are disposed in one-to-one correspondence with the grooves 110. Specifically, the protruding structure 31 may be formed on the side of the flexible layer 30 close to the hard substrate 10 by etching or the like, which is not specifically limited in this application.

Wherein, in the laminating process of flexible layer 30 and stereoplasm base plate 10, protruding structure 31 corresponding with groove structure 11 produces the extrusion to bonding glue film 20 for bonding glue film 20 is filled into corresponding groove structure 11 in, provides more deformation volume, has played the effect of buffering shock attenuation, thereby can avoid flexible layer 30 to keep away from the impression of appearing in the one side of stereoplasm base plate 10.

The embodiment of the application provides a manufacturing method of a support plate, in the manufacturing method, a groove structure 11 is arranged on a hard substrate 10, and a convex structure 31 is arranged on one side of a flexible layer 30 close to the hard substrate 10. Therefore, in the process of attaching the flexible layer 30 to the hard substrate 10 through the adhesive layer 20, the protruding structures 31 may extrude a portion of the adhesive layer 20 into the groove structures 11, so as to ensure the smoothness of the flexible layer 30 after being attached to the hard substrate 10, and avoid the occurrence of marks on the side of the flexible layer 30 away from the hard substrate 10.

Further, in the present embodiment, the flexible layer 30 may be made of foam. Referring to fig. 9 and fig. 10A to 10D, fig. 9 is a second flow chart of a method for manufacturing a support plate according to the present application, and fig. 10A to 10D are schematic structural diagrams obtained in the method for manufacturing the support plate shown in fig. 9. The difference from the manufacturing method of the support plate shown in fig. 7 is that, in the embodiment of the present application, before the step of attaching a flexible layer to the side of the adhesive glue layer away from the hard substrate, the method further includes the following steps:

201. a foam material layer is formed on the substrate.

Specifically, a layer 42 of foam is applied to the substrate 41.

The substrate 41 may be a glass substrate or other work machine to support. The foam material layer 42 may be one or more of acryl foam, urethane foam, and polyethylene foam.

202. And drying the foam material layer.

Specifically, the foam material layer 42 is dried at a high temperature. The drying temperature is 200 ℃ to 250 ℃. The drying time can be set according to actual requirements. After drying, the hardness of the foam material layer 42 is increased and the thickness is reduced.

203. The foam material layer is far away from one side of the substrate is provided with a foam mould, the foam mould is close to one side of the substrate is provided with groove patterns, and the groove patterns are the same as the groove structures.

Specifically, a predetermined distance d is provided between the foam mold 43 and the foam material layer 42. The predetermined distance d is used to ensure that the foam material layer 42 is foamed to the actually required thickness. The predetermined distance d may also be set according to the foaming ability of the foam material layer 42. Further, the foam mold 43 may be fixed above the foam material layer 42 by a fixing means such as a clamper.

The foam mold 43 may be a hardware mold, a plastic mold, or other special molds. The groove pattern 431 in the foam mold 43 may be formed by a conventional process, which is not particularly limited in this application.

204. Foaming the foam material layer to form the flexible layer with the convex structure.

Specifically, the foaming principle of the foam material layer 42 is divided into physical foaming and chemical foaming. Physical foaming is to dissolve inert gas in the foam material layer 42 under pressure, and then release the gas under reduced pressure to foam. The chemical foaming is to heat the chemical foaming agent added into the foam material layer 42 to decompose and release gas for foaming. The specific foaming method can be selected according to actual conditions.

The flexible layer 30 formed after foaming has a raised structure 31 that conforms to the groove pattern 431. It can be understood that since the groove pattern 431 is the same as the groove structure 11 in the hard substrate 10, the protrusion structure 31 is adapted to the groove structure 11 in the hard substrate 10. Of course, in other embodiments, the groove pattern 431 may be different from the groove structure 11 in the hard substrate 10, as long as the finally formed protrusion structure 31 is adapted to the groove structure 11 in the hard substrate 10.

The embodiment of the present application provides a method for manufacturing a support plate, in which the flexible layer 30 is made of foam. Therefore, by adding a foam mold 43, the flexible layer 30 with the protrusion structures 31 is directly formed during the foaming process, and the process is simplified. In addition, since the groove pattern 431 in the foam mold 43 is the same as the groove structure 11 in the hard substrate 10, the protrusion structure 31 is more adaptive to the groove structure 11, and the attaching precision of the flexible layer 30 and the hard substrate 10 is further improved.

The present application further provides a flexible display device, where the flexible display device includes a flexible display panel and a supporting plate, where the supporting plate may be the supporting plate described in any of the above embodiments, and reference may be made to the above contents, which is not described herein again.

Specifically, please refer to fig. 11, fig. 11 is a schematic structural diagram of the flexible display device provided in the present application. As shown in fig. 11, the flexible display device 1000 includes a flexible display panel 200 and a support plate 100. The supporting plate 100 is disposed on a side of the flexible display panel 200 away from the light emitting surface 201. When the flexible display panel 200 is bent, the support plate 100 may play a role of alleviating wrinkles while providing support.

The flexible display panel 200 has at least one bending portion 200A. The supporting plate 100 has at least one bending region 100A. The bending regions 100A are disposed corresponding to the bending portions 200A one to one. The supporting board 100 is provided with a groove structure 11 in the bending region 100A. The groove structure 11 can improve the bending resistance of the supporting plate 100, and prevent the supporting plate 100 and the flexible display panel 200 from being separated from each other.

It should be noted that, when the supporting board 100 is attached to the flexible display panel 200, the groove structure 11 in the supporting board 100 is shown in fig. 2. Through simulation stress analysis, the grooves 110 arranged in an array enable the supporting plate 100 to have better bending resistance, and further improve the bending resistance of the flexible display panel 200.

The embodiment of the present application provides a flexible display device 1000, which includes a flexible display panel 200. A support plate 100 is disposed on a side of the flexible display panel 200 away from the light emitting surface 201. The support plate 100 includes a rigid substrate 10, an adhesive layer 20, and a flexible layer 30 stacked together. Wherein, a groove structure 11 is arranged on the hard substrate 10. This application embodiment sets up protruding structure 31 through being close to one side of stereoplasm base plate 10 at flexible layer 30, and protruding structure 31 corresponds the setting with groove structure 11 for some bonding glue film 20 is filled in groove structure 11, thereby guarantees the planarization after flexible layer 30 and the laminating of stereoplasm base plate 10, has avoided impression phenomenon to appear in one side that flexible layer 30 kept away from stereoplasm base plate 10. Further, after the flexible display panel 200 is attached to the supporting plate 100, a mark observed from the light emitting surface 201 of the flexible display panel 200 can be avoided, thereby improving the quality of the flexible display device 1000.

It should be noted that the drawings provided in the present application are only schematic and do not represent actual dimensions of the support plate or the flexible display device, etc., and therefore, should not be construed as limiting the present application.

The supporting plate, the manufacturing method thereof, and the flexible display device provided in the present application are described in detail above, and a specific example is applied in the description to explain the principle and the embodiment of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A support plate, comprising:

the structure comprises a hard substrate, wherein a groove structure is arranged on the hard substrate and comprises a plurality of grooves which are arranged in an array manner, the length of a first side edge of each groove is 3.5-4.5 mm, and the length of a second side edge of each groove is 0.15-0.25 mm; the distance between two adjacent grooves is 0.35 mm to 0.45 mm along the row direction;

the adhesive glue layer is arranged on the hard substrate; and

the flexible layer is arranged on one side, far away from the hard substrate, of the bonding adhesive layer, a protruding structure is arranged on one side, close to the hard substrate, of the flexible layer, the protruding structure is arranged corresponding to the groove structure, the protruding structure comprises a plurality of protruding portions which are arranged in an array mode, and the protruding portions and the grooves are arranged in a one-to-one correspondence mode;

wherein, part of the adhesive layer is positioned in the groove structure.

2. The support plate of claim 1, wherein a projection of each of the protrusions onto the rigid substrate is located within a respective one of the recesses.

3. The support plate of claim 1, wherein the thickness of the raised portion is greater than or equal to the thickness of the adhesive glue layer in a direction perpendicular to the rigid substrate.

4. The support plate as in claim 1, wherein the cross-sectional configuration of the boss is rectangular, inverted trapezoidal, or inverted triangular.

5. The support plate of claim 1, wherein the support plate has at least one inflection region, and the groove structure is located in the inflection region.

6. The support plate of claim 1, wherein the thickness of the rigid substrate is 100 to 150 microns, the thickness of the flexible layer is 80 to 120 microns, and the thickness of the adhesive glue layer is 20 to 30 microns.

7. A method of making a support plate, comprising:

providing a hard substrate, wherein a groove structure is arranged on the hard substrate, the groove structure comprises a plurality of grooves which are arranged in an array manner, the length of a first side edge of each groove is 3.5-4.5 mm, and the length of a second side edge of each groove is 0.15-0.25 mm; the distance between two adjacent grooves is 0.35 mm to 0.45 mm along the row direction;

forming an adhesive layer on the hard substrate;

the flexible layer is attached to one side, away from the hard substrate, of the bonding glue layer, the flexible layer is close to one side of the hard substrate and is provided with a protruding structure, the protruding structure corresponds to the groove structure and is arranged, part of the protruding structure is extruded to the bonding glue layer in the groove structure, the protruding structure comprises a plurality of protruding portions which are arranged in an array mode, and the protruding portions are arranged in a groove one-to-one mode.

8. The method as claimed in claim 7, wherein the flexible layer is foam, and the step of attaching a flexible layer to the side of the adhesive layer away from the rigid substrate further comprises:

forming a foam material layer on the substrate;

drying the foam material layer;

arranging a foam mould on one side of the foam material layer far away from the substrate, wherein a groove pattern is arranged on one side of the foam mould close to the substrate, and the groove pattern has the same structure as the groove;

9. A flexible display device comprising a flexible display panel and a support plate according to any one of claims 1 to 6.