CN113570967A

CN113570967A - Flexible display panel and flexible display device

Info

Publication number: CN113570967A
Application number: CN202110772514.9A
Authority: CN
Inventors: 祝翠林
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2021-10-29
Anticipated expiration: 2041-07-08
Also published as: CN113570967B

Abstract

The flexible display panel comprises a substrate, a heat dissipation composite material and a stiff metal layer, wherein the heat dissipation composite material is arranged on the substrate and comprises a film tearing side and an adsorption side adjacent to the film tearing side. The heat dissipation composite material comprises grid glue, foam, polyimide and copper foil which are sequentially stacked. The heat dissipation composite material comprises a base plate, a heat dissipation composite material layer, a stiff metal layer and a tear film, wherein the stiff metal layer is arranged on one side face, far away from the base plate, of the heat dissipation composite material, the projection area of the stiff metal layer on the base plate is larger than or equal to the projection area of the tear film side on the base plate, the overall stiffness of the heat dissipation composite material is increased, rejection of thrown materials is reduced, and the efficiency of production equipment is improved.

Description

Flexible display panel and flexible display device

Technical Field

The present invention relates to the field of display technologies, and in particular, to a flexible display panel and a flexible display device.

Background

In the modern communication industry, the market demands of products such as mobile phones, televisions, flat panels, notebooks, digital cameras and the like are increasing, various display devices are developing in a bendable manner, and the product materials are designed towards a larger area and a thinner thickness direction. At present, a composite material for heat dissipation needs to be used in the production of a flexible display panel, and in the leading-in stage of a new product/material, a Charge-coupled Device (CCD) frequently has the problem that the abnormal edge profile of the composite material is identified to cause material throwing and scrap (the rejection rate reaches 4%), so that the material loss and the equipment production efficiency loss are caused, the composite material needs to be changed for many times, and the leading-in time of the new product is influenced.

As shown in fig. 1, in a module attaching manufacturing process of a conventional composite material 12, after a Protective Film (PF) 13 attached to the composite material 12 is removed, the edge of the composite material 12 is easily warped and deformed, so that a Charge-coupled Device (CCD) 4 frequently appears with an unclear identification or an abnormal identification. Specifically, when the cutting device/pressing device 3 is to cut/press the composite material 12 placed on the machine 11, the CCD frequently recognizes that the edge profile of the composite material 12 is abnormal, which results in scrapping of the material, which results in material throwing loss of the composite material 12, loss of cost and production efficiency of the equipment, and influence on the new product introduction time.

Disclosure of Invention

The invention aims to provide a flexible display panel and a flexible display device, which can increase the overall stiffness of a heat dissipation composite material, reduce the material loss cost, improve the production efficiency of equipment and refine the new product introduction time.

In order to achieve the above object, the present invention provides a flexible display panel, which includes a substrate, a heat dissipation composite material and a stiff metal layer, wherein the heat dissipation composite material is disposed on the substrate, and the heat dissipation composite material includes a film tearing side and an adsorption side adjacent to the film tearing side. The heat dissipation composite material comprises grid glue, foam, polyimide and copper foil which are sequentially stacked. The heat dissipation composite material comprises a heat dissipation composite material, a stiff metal layer and a tear film, wherein the stiff metal layer is arranged on one side face, far away from the substrate, of the heat dissipation composite material, and the projection area of the stiff metal layer on the substrate is larger than or equal to the projection area of the tear film side on the substrate.

Preferably, the material of the stiff metal layer comprises one of stainless steel, nickel, chromium, molybdenum and steel or a combination thereof.

Preferably, the stiff metal layer is arranged on the surface of one side of the polyimide, which is far away from the foam and is arranged corresponding to the film tearing side, the copper foil is arranged corresponding to the adsorption side, and the stiff metal layer and the copper foil are adjacent and arranged on the same layer.

Preferably, the stiff metal layer is arranged on the surface of one side of the copper foil, which is far away from the polyimide, and is arranged corresponding to the side of the tear film.

Preferably, the heat dissipating composite further comprises a graphite sheet disposed between the polyimide and the copper foil.

Preferably, the length of the stiff metal layer is between 25 mm and 30 mm.

Preferably, the thicknesses of the heat dissipation composite, the copper foil and the stiff metal layer are between 50 micrometers and 100 micrometers.

Preferably, the flexible display panel further includes a polyester, a polarizing film, an optical adhesive, and a glass cover plate, the polyester is disposed between the substrate and the heat dissipation composite material, and the polarizing film, the optical adhesive, and the glass cover plate are sequentially stacked on a surface of the substrate on a side away from the polyester.

Preferably, the substrate is an organic light emitting diode substrate.

The invention also provides a flexible display device which comprises the flexible display panel.

The invention also has the following effects that aiming at the problem of material throwing loss of the existing composite material, a new heat-dissipation composite material is adopted, namely one or the combination of SS (stainless steel), nickel, chromium, molybdenum and steel is/are added on one side (namely the equipment film tearing side) of the heat-dissipation composite material, which is easy to deform, so that the stiffness of the whole material is increased, the material warping caused by tearing off a protective film of the heat-dissipation composite material and the deformation of the heat-dissipation composite material are avoided, the unobvious or abnormal edge outline identification of the heat-dissipation composite material is reduced, the material throwing scrap is reduced, the production efficiency of the equipment is improved, and the new product leading-in time interval is refined. Moreover, the heat dissipation composite material also comprises a graphite sheet and a plurality of pressure sensing glues, and the graphite sheet can increase the effect of anti-extrusion or anti-hot-pressing on the back of the heat dissipation composite material in the module pressing manufacturing process. The pressure sensing glue can effectively and smoothly attach the structures together.

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 diagram of a composite material tearing protection film and a CCD failure of a conventional flexible display panel;

FIG. 2 is a schematic cross-sectional view of a heat-dissipating composite of the present invention having a stiff metal layer;

FIG. 3 is another schematic cross-sectional view of a heat dissipating composite of the present invention having a stiff metal layer;

fig. 4 is a schematic cross-sectional view of a heat-dissipating composite of the present invention provided with a graphite sheet; and

fig. 5 is a schematic cross-sectional view of a flexible display device according to the invention.

Detailed Description

Reference in the detailed description to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the same phrases in various places in the specification are not necessarily limited to the same embodiment, but are to be construed as independent or alternative embodiments to other embodiments. In light of the disclosure of the embodiments provided by the present invention, it should be understood by those skilled in the art that the embodiments described in the present invention can have other combinations or variations consistent with the concept of the present invention.

Where certain terms are used throughout the description and claims to refer to particular components, those skilled in the art will appreciate that manufacturers may refer to the same components by different names. In the present specification and claims, the difference in name is not used as a means for distinguishing between components, but a difference in function of a component is used as a reference for distinguishing between components. The present invention will be described in detail below with reference to the accompanying drawings and examples.

Referring to fig. 2 and fig. 3, fig. 2 is a schematic cross-sectional view illustrating a stiff metal layer disposed on a heat dissipation composite according to the present invention; fig. 3 is another schematic cross-sectional view of the heat dissipating composite provided with a stiff metal layer. As shown in the figure, the present invention provides a flexible display panel 100, which includes a substrate 110, a heat dissipation composite 120, and a stiff metal layer 130. The substrate 110 is, for example, an organic light emitting diode substrate. The heat dissipation composite 120 is disposed on the substrate 110, and the heat dissipation composite 120 includes a tear film side 121 and an adsorption side 122 adjacent to the tear film side 121. Specifically, the tearing-film side 121 is close to the edge of the device outline (also called device tearing-film side) for tearing the protective film (not shown), and the absorption side 122 is for absorption, transportation and movement of the absorption device (not shown). The heat dissipation composite 120 includes a grid glue 123, a foam 124, a Polyimide (PI) 125, and a copper foil 126, which are sequentially stacked, but not limited thereto. The stiff metal layer 130 is disposed on a side of the heat dissipation composite 120 away from the substrate 110, and a projected area of the stiff metal layer 130 on the substrate 110 is greater than or equal to a projected area of the tear film side 121 on the substrate 110.

In this embodiment, the material of the stiff metal layer 130 is preferably Stainless Steel (SS) or an alloy thereof, which can increase the stiffness of the whole heat dissipation composite material 120, and avoid the problem of abnormal identification of the edge profile of the heat dissipation composite material 120 due to material warpage deformation of the heat dissipation composite material 120 caused by tearing off the protective film, thereby reducing scrap and cost loss of material throwing, and improving the efficiency of production equipment and the time course of introducing new products. In other less preferred embodiments, the material of the stiff metal layer 130 may also be one or a combination of nickel, chromium, molybdenum, and steel, and is not limited.

In the embodiment shown in fig. 2, the stiff metal layer 130 is disposed on a surface of the copper foil 126 away from the polyimide 125 and is disposed corresponding to the tear film side 121, so that the stiffness of the entire heat dissipation composite 120 can be rapidly increased. However, in the embodiment shown in fig. 3, the stiff metal layer 130 is disposed on the surface of the polyimide 125 on the side away from the foam 124 and corresponding to the tear film side 121, and the copper foil 126 is disposed corresponding to the absorption side 122, so that the stiff metal layer 130 is disposed adjacent to and in the same layer as the copper foil 126. Therefore, the stiffness of the heat dissipation composite material 120 can be effectively increased while avoiding increasing the thickness of the entire flexible display panel 100. As shown in fig. 2 and 3, the length L of the stiff metal layer 130 is between 25 millimeters (mm) and 30 mm, and the thicknesses of the heat dissipation composite 120, the copper foil 126, and the stiff metal layer 130 are between 50 micrometers (μm) and 100 micrometers.

Referring also to fig. 4, the heat dissipation composite 120 further includes a graphite sheet 127 and a plurality of Pressure Sensitive Adhesives (PSAs) 128, wherein the graphite sheet 127 is preferably disposed between the polyimide 125 and the copper foil 126, which can increase the anti-pressing or anti-hot-pressing effect on the back surface of the heat dissipation composite 120. In this embodiment, each of the pressure sensing adhesives 128 is attached to two opposite surfaces of the polyimide 125 and one surface of the copper foil 126 facing the graphite sheet 127, so that the foam 124, the polyimide 125, the graphite sheet 127, and the copper foil 126 are fixedly laminated with each other. It should be noted that the heat dissipation Composite 120 is also referred to as a Super Composite Film (SCF), which can increase the heat dissipation or other suitable effects of the flexible display panel 100.

Furthermore, the present invention also provides a flexible display device 200, as shown in fig. 5. The flexible display device 200 further includes a polyester (PET resin) 210, a polarizing film 220, an optical adhesive 230, and a glass cover 240. The polyester 210 is disposed between the substrate 110 and the heat dissipation composite 120, and the polarizing film 220, the optical adhesive 230 and the glass cover 240 are sequentially stacked on a surface of the substrate 110 away from the polyester 210. For the related structure and arrangement of the flexible display panel 100, please refer to the above embodiments, which are not described herein again.

In the embodiment shown in fig. 5, the flexible display panel 110 is, for example, an Organic Light Emitting Display (OLED). The flexible display device 200 can be applied to flexible OLED display and lighting devices of wearable devices such as smart bracelets, smart watches, Virtual Reality (VR) devices, mobile phones, electronic books/newspapers, televisions, personal portable computers, foldable/rollable OLEDs, and the like.

This embodiment adopts a new heat dissipation composite to solve the problem of the loss of the existing composite material throwing, namely, on the side (i.e. equipment membrane tearing side) that the heat dissipation composite is easy to deform, one or the combination of a layer of SS (stainless steel), nickel, chromium, molybdenum and steel is overlapped and added, and the overall stiffness of the material is increased, thereby avoiding the material warpage caused by tearing the protective film of the heat dissipation composite, and the identification of the edge profile of the heat dissipation composite caused by deformation is not obvious or abnormal, reducing the rejection of the throwing material, improving the production efficiency of the equipment, and precisely advancing the new product leading-in time. Moreover, the heat dissipation composite material also comprises a graphite sheet and a plurality of pressure sensing glues, and the graphite sheet can increase the effect of anti-extrusion or anti-hot-pressing on the back of the heat dissipation composite material in the module pressing manufacturing process. The pressure sensing glue can effectively and smoothly attach the structures together.

In view of the foregoing, while the present invention has been described in conjunction with specific embodiments thereof, it is to be understood that many alternatives, modifications, and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the included claims.

Claims

1. A flexible display panel, comprising:

a substrate;

the heat dissipation composite material is arranged on the substrate, comprises a film tearing side and an adsorption side adjacent to the film tearing side, and comprises grid glue, foam, polyimide and copper foil which are sequentially stacked; and

the heat dissipation composite material comprises a heat dissipation composite material, a stiff metal layer and a tear film, wherein the stiff metal layer is arranged on one side surface of the heat dissipation composite material, which is far away from the substrate, and the projection area of the stiff metal layer on the substrate is larger than or equal to the projection area of the tear film side on the substrate.

2. The flexible display panel according to claim 1, wherein the stiff metal layer is made of one or a combination of stainless steel, nickel, chromium, molybdenum, and steel.

3. The flexible display panel according to claim 1, wherein the stiff metal layer is disposed on a surface of the polyimide on a side away from the foam and corresponding to the side of the tear film, the copper foil is disposed corresponding to the absorption side, and the stiff metal layer is disposed adjacent to and in the same layer as the copper foil.

4. The flexible display panel according to claim 1, wherein the stiff metal layer is disposed on a surface of the copper foil facing away from the polyimide and corresponding to the side of the tear film.

5. The flexible display panel of claim 1, wherein the heat dissipating composite further comprises a graphite sheet disposed between the polyimide and the copper foil.

6. The flexible display panel of claim 1, wherein the stiff metal layer has a length between 25 mm and 30 mm.

7. The flexible display panel of claim 1, wherein the heat-dissipating composite, the copper foil, and the stiff metal layer have a thickness of between 50 microns and 100 microns.

8. The flexible display panel according to claim 1, further comprising a polyester, a polarizer film, an optical adhesive and a glass cover plate, wherein the polyester is disposed between the substrate and the heat dissipation composite, and the polarizer film, the optical adhesive and the glass cover plate are sequentially stacked on a surface of the substrate away from the polyester.

9. The flexible display panel of claim 1, wherein the substrate is an organic light emitting diode substrate.

10. A flexible display device comprising the flexible display panel according to any one of claims 1 to 9.