CN112599538A - Flexible display screen, preparation method thereof and flexible display device - Google Patents

Abstract

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.

Description

Flexible display screen, preparation method thereof and flexible display device

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 aflexible display screen 100 according to an embodiment of the present invention. Theflexible 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 theflexible display screen 100. In this way, in the bending area DF, theflexible display panel 100 can be bent or folded, and the bending area DF can also be used for displaying pictures. Specifically, theflexible display screen 100 includes adisplay panel 10, aback plate 20, asupport member 30, and acover plate 40. Theback plate 20 is attached to the lower surface of thedisplay panel 10. The supportingmember 30 is attached to the surface of theback plate 20 away from thedisplay panel 10 by a transparent optical adhesive. The lower surface of thedisplay panel 10 is a surface facing away from the light emitting direction of thedisplay panel 10. Thecover plate 40 is disposed on a surface of thedisplay panel 10 facing away from the supportingmember 30. Wherein the supportingmember 30 includes a first supportingportion 31 and a second supportingportion 32, the first supportingportion 31 is disposed corresponding to the non-bending region NDF, and the second supportingportion 32 is disposed corresponding to the bending region DF. Of course, theflexible display panel 100 may further include apolarizer 50 between thedisplay panel 10 and thecover plate 40, and thepolarizer 50 may be used to improve the contrast ratio of theflexible display panel 100 in a bright environment.

Specifically, referring to fig. 2, fig. 2 is a schematic cross-sectional structure diagram of adisplay panel 10 according to an embodiment of the present invention. Thedisplay 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. Thedisplay panel 10 includes aflexible substrate 11, adriving circuit layer 12, a lightemitting function layer 13, and anencapsulation layer 14. Theflexible substrate 11 is located on theback plate 20, thedriving circuit layer 12 is disposed on theflexible substrate 11, and the material of theflexible substrate 11 includes a flexible material such as Polyimide (PI). The lightemitting function layer 13 is disposed on thedriving circuit layer 12, and the driving circuit on thedriving circuit layer 12 is configured to drive the light emitting device of the lightemitting function layer 13 to emit light, so as to implement pixel display of thedisplay panel 10. Thepackaging layer 14 set up in on the luminousfunctional layer 13, thepackaging 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 luminousfunctional 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 thedriving circuit layer 12, the lightemitting function layer 13, etc.) of thedisplay panel 10 are disposed on theflexible substrate 11, and theflexible substrate 11 is a flexible film and cannot completely support all the film layers. Theback plate 20 is attached to the lower surface of thedisplay panel 10 to support the film layers of thedisplay panel 10, and theback plate 20 may have a laminated structure formed of Copper foil (Copper), Graphite (Graphite), Foam (Foam), or the like. Theback plate 20 can support each film layer of thedisplay panel 10, reinforce the structure of thedisplay panel 10, and dissipate heat. Asupport member 30 is attached to a surface of theback plate 20 away from thedisplay panel 10, and thesupport member 30 is attached to theback plate 20 by a transparent optical adhesive. The supportingmember 30 can further structurally reinforce thedisplay panel 10 and ensure the bending form of theflexible display screen 100.

The supportingmember 30 includes the first supportingportion 31 and the second supportingportion 32, the first supportingportion 31 is provided with anopening 311 corresponding to the bending region DF, the second supportingportion 32 is provided in theopening 311, and the width of the second supportingportion 32 is equal to the width of the bending region DF. At this time, thesecond support portion 32 is in contact with thefirst support portion 31, that is, thesecond support portion 32 completely fills theopening 311.

In an embodiment, referring to theflexible 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 supportingportion 31, there is agap 312 therebetween.

The material of the first supportingportion 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 theflexible display screen 100 can be well ensured, and thedisplay panel 10 is further structurally reinforced. The second supportingportion 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 supportingportion 32 is formed by filling elastic material with super elastic property in theopening 311, and the second supportingportion 32 can be well bonded with the transparent optical cement.

When theflexible 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 theflexible display screen 100 is folded inwards, the supportingmember 30 is located at the outermost side, and the transparent optical adhesive needs to bear a large compressive stress; when theflexible display screen 100 is folded outwards, the supportingmember 30 is located at the innermost position, and the transparent optical adhesive needs to bear a large tensile stress. The elastic material of thesecond support portion 32 is bonded to the transparent optical adhesive, when theflexible display screen 100 is folded inwards, thesecond support portion 32 is located on the outermost side of the bend, and when theflexible display screen 100 is folded outwards, thesecond support portion 32 is located on the innermost side of the bend, so that thesecond 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 thedisplay panel 10 when theflexible display screen 100 is bent at a single time can be reduced, the risk of cracks (cracks) of thedisplay panel 10 is reduced, the bending reliability of theflexible display screen 100 is improved, and the service life of the flexible display screen is prolonged.

It should be noted that, thedisplay panel 10 of the present invention may use a Pad-Bending (Pad-Bending) technique when the driver chip is bonded, and the second supportingportion 32 may be disposed on the supportingmember 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 thesupport member 30 ″ does not influence theflexible display panel 102 to ensure the bending shape, the width of thesecond support portion 32 ″ is greater than the width of the bending region DF, that is, thesecond support portion 32 ″ extends from the bending region DF to the non-bending regions NDF on both sides. Therefore, the second supportingportion 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 supportingmember 30 according to an embodiment of the present invention. The preparing of thefirst support part 31 and thesecond support part 32 to form thesupport member 30 includes the steps of:

a stainless steel film is prepared as thefirst 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 theflexible display 100.

Providing amold 60, fixing thefirst support part 31 in themold 60, and forming a space or an opening in thefirst support part 31, as shown in fig. 6; themold 60 is a hydrophobic mold, that is, themold 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 supportingpart 32, wherein the second supportingpart 32 is bonded with the first supportingpart 31 to form the supportingmember 30. Specifically, as shown in fig. 7, the second supportingportion 32 is formed in the space between the two first supportingportions 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 supportingportions 32 can be bonded to each other. And themold 60 is a loose glue type mold so that the elastic glue material does not adhere to themold 60. The elastic rubber material solution can be cured by ultraviolet irradiation, heating and other curing modes.

Thesupport member 30 is removed from themold 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, thesupport 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.

Claims (10)

Translated fromChinese

1.一种柔性显示屏，其特征在于，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：1. A flexible display screen, characterized in that it has a bending area and two non-bending areas, the bending area is located between the two non-bending areas, and the flexible display screen comprises:显示面板；display panel;背板，贴附于所述显示面板的下表面；以及a backplane attached to the lower surface of the display panel; and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；a support member, attached to the surface of the backplane away from the display panel through transparent optical glue;其中，所述支撑构件包括第一支撑部和第二支撑部，所述第二支撑部对应所述弯折区设置。Wherein, the support member includes a first support portion and a second support portion, and the second support portion is disposed corresponding to the bending area.2.根据权利要求1所述的柔性显示屏，其特征在于，所述第一支撑部在对应所述弯折区设置有开孔，所述第二支撑部设置在所述开孔内。2 . The flexible display screen according to claim 1 , wherein the first supporting portion is provided with an opening corresponding to the bending region, and the second supporting portion is provided in the opening. 3 .3.根据权利要求1所述的柔性显示屏，其特征在于，所述第一支撑部对应所述非弯折区设置，所述第一支撑部和所述第二支撑部一体式设置。3 . The flexible display screen according to claim 1 , wherein the first support portion is provided corresponding to the non-bending area, and the first support portion and the second support portion are integrally provided. 4 .4.根据权利要求2或3所述的柔性显示屏，其特征在于，所述第二支撑部的宽度大于所述弯折区的宽度。4 . The flexible display screen according to claim 2 , wherein the width of the second support portion is greater than the width of the bending region. 5 .5.根据权利要求1所述的柔性显示屏，其特征在于，所述第一支撑部的材料包括不锈钢。5 . The flexible display screen according to claim 1 , wherein the material of the first support portion comprises stainless steel. 6 .6.根据权利要求1所述的柔性显示屏，其特征在于，所述第二支撑部的材料包括弹性橡胶。6 . The flexible display screen according to claim 1 , wherein the material of the second support portion comprises elastic rubber. 7 .7.一种柔性显示屏制备方法，其特征在于，包括以下步骤：7. A method for preparing a flexible display screen, comprising the following steps:贴附背板，包括提供显示面板和背板，在所述显示面板的下表面贴附所述背板，其中所述显示面板具有弯折区和非弯折区；Attaching a backplane includes providing a display panel and a backplane, and attaching the backplane to the lower surface of the display panel, wherein the display panel has a bending area and a non-bending area;贴附支撑构件，包括制备第一支撑部和第二支撑部以形成支撑构件，通过透明光学胶把所述支撑构件贴附于所述背板远离所述显示面板的表面，使所述第二支撑部与所述弯折区对应；以及Attaching a support member includes preparing a first support portion and a second support portion to form a support member, and attaching the support member to the surface of the backplane away from the display panel through transparent optical glue, so that the second support member is the support portion corresponds to the bending region; and贴附盖板，包括提供盖板，将所述盖板贴附于所述显示面板背离所述支撑构件的表面。Attaching a cover plate includes providing a cover plate, and attaching the cover plate to a surface of the display panel facing away from the support member.8.根据权利要求7所述的柔性显示屏制备方法，其特征在于，所述制备所述第一支撑部和所述第二支撑部以形成所述支撑构件包括以下步骤：8 . The method for manufacturing a flexible display screen according to claim 7 , wherein the preparing the first support portion and the second support portion to form the support member comprises the following steps: 9 .使用不锈钢制备不锈钢薄膜作为所述第一支撑部；Using stainless steel to prepare a stainless steel film as the first support;提供模具，把所述第一支撑部固定在所述模具中，且所述第一支撑部形成有间隔或开孔；providing a mold in which the first support portion is fixed, and the first support portion is formed with spaces or openings;在所述间隔或所述开孔内注入弹性胶材溶液，并固化所述弹性胶材溶液形成所述第二支撑部，所述第二支撑部与所述第一支撑部粘结形成所述支撑构件；以及An elastic glue material solution is injected into the space or the opening, and the elastic glue material solution is cured to form the second support portion, and the second support portion and the first support portion are bonded to form the second support portion. support members; and从所述模具中取出所述支撑构件。The support member is removed from the mold.9.根据权利要求7所述的柔性显示屏制备方法，其特征在于，把所述支撑构件贴附于所述背板远离所述显示面板的表面的方法包括在真空状态下使用滚轮贴合。9 . The manufacturing method of the flexible display screen according to claim 7 , wherein the method of attaching the support member to the surface of the backplane away from the display panel comprises using a roller to attach in a vacuum state. 10 .10.一种柔性显示装置，其特征在于，包括如权利要求1至6任一项所述的柔性显示屏。10. A flexible display device, comprising the flexible display screen according to any one of claims 1 to 6.

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