阅读说明：本技术 柔性显示屏、其制备方法、及柔性显示装置 (Flexible display screen, preparation method thereof and flexible display device ) 是由 张杨 于 2020-12-11 设计创作，主要内容包括：本发明提供一种柔性显示屏、其制备方法以及柔性显示装置。所述柔性显示屏具有弯折区和两个非弯折区,所述弯折区位于所述两个非弯折区之间。所述柔性显示屏包括显示面板、背板以及支撑构件。所述背板贴附于所述显示面板的下表面。所述支撑构件通过透明光学胶贴附于所述背板远离所述显示面板的表面。其中,所述支撑构件包括第一支撑部和第二支撑部,所述第一支撑部对应所述非弯折区设置,所述第二支撑部对应所述弯折区设置,且所述第二支撑部由超弹橡胶等弹性材料制备,以缓解现有柔性OLED显示器存在OCA发生剥离的问题。(The invention provides a flexible display screen, a preparation method thereof and a flexible display device. The flexible display screen is provided with a bending area and two non-bending areas, and the bending area is located between the two non-bending areas. The flexible display screen comprises a display panel, a back plate and a supporting member. The back plate is attached to the lower surface of the display panel. The supporting member is attached to the surface of the back plate far away from the display panel through transparent optical cement. The support member comprises a first support part and a second support part, the first support part corresponds to the non-bending area, the second support part corresponds to the bending area, and the second support part is made of elastic materials such as super-elastic rubber and the like so as to solve the problem that the existing flexible OLED display is stripped due to the fact that OCA exists.)

1. A flexible display screen, characterized by having a bending region and two non-bending regions, the bending region being located between the two non-bending regions, the flexible display screen comprising:

a display panel;

the back plate is attached to the lower surface of the display panel; and

the supporting member is attached to the surface, far away from the display panel, of the back plate through transparent optical cement;

the support member comprises a first support part and a second support part, and the second support part is arranged corresponding to the bending area.

2. The flexible display screen of claim 1, wherein the first support portion is provided with an opening corresponding to the bending region, and the second support portion is provided in the opening.

3. The flexible display screen of claim 1, wherein the first support portion is disposed corresponding to the non-bending region, and the first support portion and the second support portion are integrally disposed.

4. A flexible display screen according to claim 2 or 3, wherein the width of the second support portion is greater than the width of the bending region.

5. The flexible display of claim 1, wherein the material of the first support comprises stainless steel.

6. The flexible display of claim 1, wherein the material of the second support comprises an elastic rubber.

7. A preparation method of a flexible display screen is characterized by comprising the following steps:

attaching a back plate, wherein the attaching comprises providing a display panel and a back plate, and attaching the back plate to the lower surface of the display panel, wherein the display panel is provided with a bending area and a non-bending area;

attaching a support member, wherein the attaching comprises preparing a first support part and a second support part to form the support member, and attaching the support member to the surface of the back plate far away from the display panel through transparent optical cement to enable the second support part to correspond to the bending area; and

and the attached cover plate comprises a cover plate and is attached to the surface of the display panel, which is deviated from the support component.

8. The method of manufacturing a flexible display screen according to claim 7, wherein the manufacturing the first support portion and the second support portion to form the support member comprises:

preparing a stainless steel thin film as the first support part using stainless steel;

providing a mould, fixing the first supporting part in the mould, and forming a gap or an opening on the first supporting part;

injecting an elastic rubber material solution into the gap or the opening, and curing the elastic rubber material solution to form the second supporting part, wherein the second supporting part is bonded with the first supporting part to form the supporting component; and

removing the support member from the mold.

9. The method for manufacturing the flexible display screen according to claim 7, wherein the method for attaching the supporting member to the surface of the back plate away from the display panel comprises attaching the supporting member to the surface of the back plate using a roller in a vacuum state.

10. A flexible display device comprising a flexible display screen according to any one of claims 1 to 6.

Technical Field

The invention relates to the technical field of display, in particular to a flexible display screen, a preparation method thereof and a flexible display device.

Background

Flexible Organic Light Emitting Diode (OLED) displays have the advantages of active Light emission, large viewing angle, wide color gamut, high brightness, fast response speed, low power consumption, and being bendable and foldable in structure, and are increasingly popular in the market. By utilizing the characteristic that the flexible OLED display can be bent and folded, the folding display devices in various forms can be prepared, and the flexible OLED display is convenient to carry and store when going out. Generally, a flexible OLED display is provided with a support member for supporting a display panel, and the support member is disposed over the entire surface and attached to the display panel by an OCA (Optically Clear Adhesive). To achieve a better support effect for the display panel, the support members are generally formed of a high modulus material. In the process of bending the flexible OLED display, the high-modulus support member is not easy to be compressed or stretched, and the stress generated by bending is mainly borne by the OCA with low modulus. With the increase of bending times, the existence of fatigue stress causes the continuous expansion of silver lines in the OCA, and finally leads to the peeling (peeling) of the OCA, so that the product fails, and the service life and the reliability of the product are influenced.

Therefore, the problem that the existing flexible OLED display is stripped of the OCA needs to be solved.

Disclosure of Invention

The invention provides a flexible display screen, a preparation method thereof and a flexible display device, which are used for relieving the technical problem that the existing flexible OLED display is stripped of OCA.

In order to solve the above problems, the technical scheme provided by the invention is as follows:

the embodiment of the invention provides a flexible display screen which is provided with a bending area and two non-bending areas, wherein the bending area is positioned between the two non-bending areas. The flexible display screen comprises a display panel, a back plate and a supporting member. The back plate is attached to the lower surface of the display panel. The supporting member is attached to the surface of the back plate far away from the display panel through transparent optical cement. The support member comprises a first support part and a second support part, and the second support part is arranged corresponding to the bending area.

In the flexible display screen provided by the embodiment of the invention, the first supporting part is provided with an opening corresponding to the bending area, and the second supporting part is arranged in the opening.

In the flexible display screen provided by the embodiment of the invention, the first supporting part is arranged corresponding to the non-bending area, and the first supporting part and the second supporting part are integrally arranged.

In the flexible display screen provided by the embodiment of the invention, the width of the second supporting part is greater than that of the bending area.

In the flexible display screen provided by the embodiment of the invention, the material of the first supporting part comprises stainless steel.

In the flexible display screen provided by the embodiment of the invention, the material of the second supporting part comprises elastic rubber.

The embodiment of the invention also provides a preparation method of the flexible display screen, which comprises the following steps: attaching a back plate, wherein the attaching comprises providing a display panel and a back plate, and attaching the back plate to the lower surface of the display panel, wherein the display panel is provided with a bending area and a non-bending area; attaching a support member, wherein the attaching comprises preparing a first support part and a second support part to form the support member, and attaching the support member to the surface of the back plate far away from the display panel through transparent optical cement to enable the second support part to correspond to the bending area; and the attached cover plate comprises a cover plate and is attached to the surface of the display panel, which is deviated from the support component.

In the method for manufacturing a flexible display screen provided by the embodiment of the invention, the manufacturing the first supporting part and the second supporting part to form the supporting member includes the following steps: preparing a stainless steel thin film as the first support part using stainless steel; providing a mould, fixing the first supporting part in the mould, and forming a gap or an opening on the first supporting part; injecting an elastic rubber material solution into the gap or the opening, and curing the elastic rubber material solution to form the second supporting part, wherein the second supporting part is bonded with the first supporting part to form the supporting component; removing the support member from the mold.

In the preparation method of the flexible display screen provided by the embodiment of the invention, the method for attaching the supporting member to the surface of the back plate far away from the display panel comprises the step of attaching the supporting member to the surface of the back plate in a vacuum state by using a roller.

The embodiment of the invention also provides a flexible display device which comprises the flexible display screen in one of the previous embodiments.

The invention has the beneficial effects that: the flexible display screen, the preparation method thereof and the support member of the flexible display device provided by the invention are characterized in that the second support part is arranged in the bending area corresponding to the display panel, and the second support part is prepared from elastic materials such as super elastic rubber. In the process of buckling, the second supporting part has better deformability, effectively reduces the stress on single-time buckling of the OCA, prolongs the fatigue life of the OCA, and avoids product failure caused by stripping of the OCA. Meanwhile, the integral stress of the bending area of the display panel is improved, the reliability of a bending product is improved, and the service life of the bending product is prolonged.

Drawings

In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of a flexible display panel according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the invention;

fig. 3 is a schematic cross-sectional view of a flexible display screen according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of a flexible display screen according to an embodiment of the present invention;

fig. 5 is a schematic flow chart of a method for manufacturing a flexible display screen according to an embodiment of the present invention;

fig. 6 to 8 are schematic views illustrating a process for manufacturing a supporting member according to an embodiment of the present invention.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals. In the drawings, the thickness of some layers and regions are exaggerated for clarity of understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily illustrated, but the present invention is not limited thereto.

Referring to fig. 1, fig. 1 is a schematic cross-sectional structure diagram of a flexible display screen 100 according to an embodiment of the present invention. The flexible display screen 100 has a bending region DF and two non-bending regions NDF, the bending region DF is located between the two non-bending regions NDF, wherein both the bending region DF and the two non-bending regions NDF can be located in a display region of the flexible display screen 100. In this way, in the bending area DF, the flexible display panel 100 can be bent or folded, and the bending area DF can also be used for displaying pictures. Specifically, the flexible display screen 100 includes a display panel 10, a back plate 20, a support member 30, and a cover plate 40. The back plate 20 is attached to the lower surface of the display panel 10. The supporting member 30 is attached to the surface of the back plate 20 away from the display panel 10 by a transparent optical adhesive. The lower surface of the display panel 10 is a surface facing away from the light emitting direction of the display panel 10. The cover plate 40 is disposed on a surface of the display panel 10 facing away from the supporting member 30. Wherein the supporting member 30 includes a first supporting portion 31 and a second supporting portion 32, the first supporting portion 31 is disposed corresponding to the non-bending region NDF, and the second supporting portion 32 is disposed corresponding to the bending region DF. Of course, the flexible display panel 100 may further include a polarizer 50 between the display panel 10 and the cover plate 40, and the polarizer 50 may be used to improve the contrast ratio of the flexible display panel 100 in a bright environment.

Specifically, referring to fig. 2, fig. 2 is a schematic cross-sectional structure diagram of a display panel 10 according to an embodiment of the present invention. The display panel 10 may be an OLED display panel or a mini LED display panel, and the OLED display panel is taken as an example for illustration in the present invention. The display panel 10 includes a flexible substrate 11, a driving circuit layer 12, a light emitting function layer 13, and an encapsulation layer 14. The flexible substrate 11 is located on the back plate 20, the driving circuit layer 12 is disposed on the flexible substrate 11, and the material of the flexible substrate 11 includes a flexible material such as Polyimide (PI). The light emitting function layer 13 is disposed on the driving circuit layer 12, and the driving circuit on the driving circuit layer 12 is configured to drive the light emitting device of the light emitting function layer 13 to emit light, so as to implement pixel display of the display panel 10. The packaging layer 14 set up in on the luminous functional layer 13, the packaging layer 14 can be by inorganic, organic, inorganic three-layer film stack gradually the laminated structure or the laminated structure of more layers that form, is used for the protection luminous device of luminous functional layer 13 avoids the invasion of water oxygen to lead to the luminous device to become invalid.

Further, referring to fig. 1 and fig. 2, all the film layers (such as the driving circuit layer 12, the light emitting function layer 13, etc.) of the display panel 10 are disposed on the flexible substrate 11, and the flexible substrate 11 is a flexible film and cannot completely support all the film layers. The back plate 20 is attached to the lower surface of the display panel 10 to support the film layers of the display panel 10, and the back plate 20 may have a laminated structure formed of Copper foil (Copper), Graphite (Graphite), Foam (Foam), or the like. The back plate 20 can support each film layer of the display panel 10, reinforce the structure of the display panel 10, and dissipate heat. A support member 30 is attached to a surface of the back plate 20 away from the display panel 10, and the support member 30 is attached to the back plate 20 by a transparent optical adhesive. The supporting member 30 can further structurally reinforce the display panel 10 and ensure the bending form of the flexible display screen 100.

The supporting member 30 includes the first supporting portion 31 and the second supporting portion 32, the first supporting portion 31 is provided with an opening 311 corresponding to the bending region DF, the second supporting portion 32 is provided in the opening 311, and the width of the second supporting portion 32 is equal to the width of the bending region DF. At this time, the second support portion 32 is in contact with the first support portion 31, that is, the second support portion 32 completely fills the opening 311.

In an embodiment, referring to the flexible display 101 of fig. 3, the width L1 of the second supporting portion 32 ' of the supporting member 30 ' may also be smaller than the width L2 of the bending region DF, when the second supporting portion 32 ' is not in contact with the first supporting portion 31, there is a gap 312 therebetween.

The material of the first supporting portion 31 includes a hard material such as stainless steel (e.g., SUS), and the stainless steel is a high modulus material and is not easily deformed when being stressed, so that the bending shape of the flexible display screen 100 can be well ensured, and the display panel 10 is further structurally reinforced. The second supporting portion 32 is made of elastic materials with super-elasticity, such as elastic rubber, which has good toughness and strong compression or stretching deformation capacity and is easy to deform when stressed. The second supporting portion 32 is formed by filling elastic material with super elastic property in the opening 311, and the second supporting portion 32 can be well bonded with the transparent optical cement.

When the flexible display screen 100 is bent or folded, the bending region DF may generate a large stress due to deformation, and the transparent optical adhesive with a low modulus may bear the large stress. When the flexible display screen 100 is folded inwards, the supporting member 30 is located at the outermost side, and the transparent optical adhesive needs to bear a large compressive stress; when the flexible display screen 100 is folded outwards, the supporting member 30 is located at the innermost position, and the transparent optical adhesive needs to bear a large tensile stress. The elastic material of the second support portion 32 is bonded to the transparent optical adhesive, when the flexible display screen 100 is folded inwards, the second support portion 32 is located on the outermost side of the bend, and when the flexible display screen 100 is folded outwards, the second support portion 32 is located on the innermost side of the bend, so that the second support portion 32 can deform to effectively bear partial compressive stress or tensile stress generated by the bend, the stress borne by the transparent optical adhesive during single bending is reduced, and the transparent optical adhesive is prevented from being peeled off. Meanwhile, the internal stress of the display panel 10 when the flexible display screen 100 is bent at a single time can be reduced, the risk of cracks (cracks) of the display panel 10 is reduced, the bending reliability of the flexible display screen 100 is improved, and the service life of the flexible display screen is prolonged.

It should be noted that, the display panel 10 of the present invention may use a Pad-Bending (Pad-Bending) technique when the driver chip is bonded, and the second supporting portion 32 may be disposed on the supporting member 30 corresponding to the Pad Bending region to reduce the Bending stress of the Pad Bending region.

In an embodiment, please refer to fig. 4, and fig. 4 is a schematic cross-sectional structure diagram of a flexible display panel according to an embodiment of the present invention. Unlike the above embodiments, on the premise that the support member 30 ″ does not influence the flexible display panel 102 to ensure the bending shape, the width of the second support portion 32 ″ is greater than the width of the bending region DF, that is, the second support portion 32 ″ extends from the bending region DF to the non-bending regions NDF on both sides. Therefore, the second supporting portion 32 ″ can bear more compressive stress or tensile stress, so as to better reduce the stress on the transparent optical adhesive. For other descriptions, please refer to the above embodiments, which are not repeated herein.

In one embodiment, unlike the above-described embodiments, the second support and the first support are integrally provided, that is, the opening of the first support is extended to a space and the first support is cut off, or two smaller first supports are used, the two first supports having a space. The second supporting part is arranged in the interval and is made of elastic material with super-elastic property, and the elastic material also has strong viscosity, so that the second supporting part and the first supporting part can be bonded together to form the supporting member. For other descriptions, please refer to the above embodiments, which are not repeated herein.

In an embodiment, please refer to fig. 5, and fig. 5 is a schematic flow chart of a method for manufacturing a flexible display according to an embodiment of the present invention. The preparation method of the flexible display screen comprises the following steps:

s10: attaching a back plate, wherein the attaching comprises providing a display panel and a back plate, and attaching the back plate to the lower surface of the display panel, wherein the display panel is provided with a bending area and a non-bending area;

specifically, the display panel and the back plate are prepared, and the display panel can be an OLED display panel or a mini LED display panel and the like. The back sheet may be a laminate structure formed of Copper foil (Copper), Graphite (Graphite), Foam (Foam), or the like. And adhering the back plate to the lower surface of the display panel by using adhesive glue.

S20: attaching a support member, wherein the attaching comprises preparing a first support part and a second support part to form the support member, and attaching the support member to the surface of the back plate far away from the display panel through transparent optical cement to enable the second support part to correspond to the bending area;

specifically, referring to fig. 6 to 8 in combination, fig. 6 to 8 are schematic views illustrating a preparation process of the supporting member 30 according to an embodiment of the present invention. The preparing of the first support part 31 and the second support part 32 to form the support member 30 includes the steps of:

a stainless steel film is prepared as the first support portion 31 using stainless steel; the stainless steel may be SUS series, and the size of the prepared stainless steel thin film may be set according to actual requirements of the flexible display 100.

Providing a mold 60, fixing the first support part 31 in the mold 60, and forming a space or an opening in the first support part 31, as shown in fig. 6; the mold 60 is a hydrophobic mold, that is, the mold 60 is made of a hydrophobic material, and the hydrophobic material does not react with the adhesive material.

And injecting an elastic rubber material solution into the gap or the opening, and solidifying the elastic rubber material solution to form the second supporting part 32, wherein the second supporting part 32 is bonded with the first supporting part 31 to form the supporting member 30. Specifically, as shown in fig. 7, the second supporting portion 32 is formed in the space between the two first supporting portions 31, the elastic rubber material solution may be an elastic rubber solution having a relatively high viscosity, and the elastic rubber material solution is injected into the space and cured, so that the two second supporting portions 32 can be bonded to each other. And the mold 60 is a loose glue type mold so that the elastic glue material does not adhere to the mold 60. The elastic rubber material solution can be cured by ultraviolet irradiation, heating and other curing modes.

The support member 30 is removed from the mold 60 as shown in fig. 8.

Further, the supporting member is attached to the surface of the back plate far away from the display panel by using transparent optical cement, so that the first supporting part and the second supporting part respectively correspond to the non-bending area and the bending area. The method of attaching the supporting member to the back plate may employ bonding using a roller in a vacuum state.

S30: and the attached cover plate comprises a cover plate, and the cover plate is attached to the surface of the display panel, which deviates from the supporting member, so that the flexible display screen is manufactured.

Naturally, before the cover plate is attached, a polarizer may be attached to a surface of the display panel facing away from the supporting member.

It should be noted that, in the method for manufacturing a flexible display panel according to the present invention, the support member 30 is integrally manufactured, but the present invention is not limited thereto, and the method for manufacturing a flexible display panel according to the present invention is also applicable to manufacturing other flexible display panels according to the embodiments of the present invention. In the preparation method of the flexible display screen, the transparent optical adhesive can be used for both attaching the back plate and attaching the cover plate.

In an embodiment, a flexible display device is provided, comprising a flexible display screen according to one of the above embodiments.

According to the above embodiments:

the invention provides a flexible display screen, a preparation method thereof and a flexible display device. The flexible display screen is provided with a bending area and two non-bending areas, and the bending area is located between the two non-bending areas. The flexible display screen includes a display panel and a support member. The supporting member is attached to the display panel through transparent optical cement. The support member comprises a first support part and a second support part, the first support part is arranged corresponding to the non-bending area, the second support part is arranged corresponding to the bending area, and the second support part is made of elastic materials such as super-elastic rubber. In the process of buckling, the second supporting part has better deformability, effectively reduces the stress on single-time buckling of the OCA, prolongs the fatigue life of the OCA, and avoids product failure caused by stripping of the OCA. Meanwhile, the integral stress of the bending area of the display panel is improved, the reliability of a bending product is improved, and the service life of the bending product is prolonged.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.