CN114512530B

CN114512530B - OLED display panel

Info

Publication number: CN114512530B
Application number: CN202210178095.0A
Authority: CN
Inventors: 请求不公布姓名; 张冬冬; 滕飞
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2025-01-28
Anticipated expiration: 2042-02-25
Also published as: CN114512530A

Abstract

The present invention provides an OLED display panel, comprising a display module, a support member located at the back of the display module, and a protective cover plate located at a side of the support member away from the display module; wherein the display module is bent at its back to form an accommodating cavity, and the support member is located in the accommodating cavity; the support member comprises a first support film and a second support film arranged in a stacked manner, a stress buffer layer located between the first support film and the second support film, and a support block located at the stress buffer layer near the bent side of the display module; wherein the stress buffer layer comprises an integrated stacked grid adhesive layer, a foam layer, a flexible layer and a hardened film, and the stress buffer layer is provided with a hollow structure in a non-display area; the present invention designs the original foam structure and the reinforcing plate combined structure into an integrated stress buffer layer, so as to avoid the phenomenon of cracking of the OLED display panel during the binding and extrusion process, reduce the bonding stress through the hollow structure, improve the bonding yield, and ensure the normal display of the display module.

Description

OLED display panel

Technical Field

The invention relates to the technical field of display, in particular to an OLED display panel.

Background

The OLED display panel has the advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180-degree visual angle, wide use temperature range, capability of realizing flexible display, large-area full-color display and the like, and is widely applied to the fields of display, illumination, intelligent wearing and the like.

In order to realize the narrow frame scheme of the OLED display panel, the driving chip is bent to the back of the display module by mainly bending the driving chip by virtue of the binding area. The back of the display panel in the existing display module is generally attached with an SCF (Super Clean Foam) structure and a reinforcing plate, the SCF structure plays a role in buffering, the reinforcing plate plays a role in fixing, the height of a bending area of a binding area is generally determined by the thickness of a film layer below the display panel, namely, the thickness of the SCF structure and the thickness of the reinforcing plate are determined, the bending radius of the bending area is required to be designed to be smaller, the SCF structure and the reinforcing plate are tightly attached to the inner cavity of the bent display module, the generated internal stress is larger, poor attaching is easy to occur, the display effect is influenced, and in particular, in the actual attaching of the display panel with four curved surfaces, the situation of poor attaching occurs more easily due to the shape design of the binding area.

In summary, a new OLED display panel is required to be provided to solve the problems of the prior art that the bending radius of the bending region in the OLED display panel is designed smaller, the internal stress generated by the supporting structure of the inner cavity of the bent display module is larger, and poor lamination is easy to occur.

Disclosure of Invention

According to the application, the problem of poor lamination is solved because the support structure of the inner cavity of the bent display module generates larger internal stress due to smaller bending radius design of the bending area in the OLED display panel in the prior art.

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

The embodiment of the invention provides an OLED display panel which comprises a display area and a non-display area positioned at one side of the display area, wherein the OLED display panel comprises a display module, a supporting member positioned at the back of the display module and a protective cover plate positioned at one side of the supporting member away from the display module.

The back of the display module is bent to form a containing cavity, the supporting member is located in the containing cavity and fills the containing cavity, and the supporting member comprises a first supporting film, a second supporting film, a stress buffer layer and a supporting block, the first supporting film and the second supporting film are arranged in a laminated mode, the stress buffer layer is located between the first supporting film and the second supporting film, and the supporting block is located on the side, close to the bending side of the display module, of the stress buffer layer.

The stress buffer layer comprises an integrated laminated grid glue layer, a foam layer, a flexible layer and a hardening film, and is provided with a hollowed-out structure in the non-display area.

According to a preferred embodiment of the invention, the hollow structures are arranged in the non-display area in a cross manner along the transverse direction and/or the longitudinal direction, or the hollow structures are distributed in the non-display area in a row manner, and the hollow structures of any two adjacent rows are arranged in a staggered manner.

According to a preferred embodiment of the present invention, the hollow structure is a blind hole or a through hole, and the width of the hollow structure is gradually increased from the edge of the non-display area to the display area of the display module, and the length of the hollow structure is unchanged.

According to a preferred embodiment of the present invention, the material of the flexible layer is transparent polyimide, the hardened film is an inorganic film layer or copper foil, and the material of the inorganic film layer is one material or more than one material of silicon oxide, silicon nitride and silicon oxynitride.

According to a preferred embodiment of the present invention, the flexible layer comprises two polyimide laminate film layers, and the hardened film comprises two copper foil laminate film layers.

According to a preferred embodiment of the present invention, the materials of the first support film and the second support film are both bending-resistant transparent materials.

According to a preferred embodiment of the invention, the first support film and the second support film are close to the bending side of the display module and exceed one side of the stress buffer layer, one side of the support block is attached to the end part of the first support film, the other side of the support block is attached to the side surface of the stress buffer layer, and the support block is not in contact with the display module.

According to a preferred embodiment of the present invention, a first polarizing layer and a first optically transparent adhesive layer are further disposed between the support member and the protective cover plate, and a peelable protective film is further disposed on a side of the protective cover plate away from the support member.

According to a preferred embodiment of the present invention, a UV glue layer is disposed on the surface of the bent display module, a second polarizing layer is disposed on the light emitting surface of the display module, and the second polarizing layer and the UV glue layer are disposed on the same layer.

According to a preferred embodiment of the invention, the binding end of the display module is connected with a driving unit, wherein 5 rows of external leakage terminals are exposed in a non-display area of the display module, 5 rows of connection terminals are arranged on the driving unit corresponding to the 5 rows of external leakage terminals, and the 5 rows of external leakage terminals are electrically connected with the 5 rows of connection terminals in a one-to-one correspondence manner.

The OLED display panel comprises a display area and a non-display area located at one side of the display area, the OLED display panel comprises a display module, a supporting member located at the back of the display module and a protective cover plate located at one side of the supporting member away from the display module, wherein an accommodating cavity is formed in the back of the display module, the supporting member is located in the accommodating cavity and fills the accommodating cavity, the supporting member comprises a first supporting film, a second supporting film, a stress buffer layer and a supporting block, the first supporting film and the second supporting film are arranged in a laminated mode, the stress buffer layer is located between the first supporting film and the second supporting film, the supporting block is located on the side, close to the bending side of the display module, of the stress buffer layer, the grid glue layer, the foam layer, the flexible layer and the hardening film are integrally arranged in a laminated mode, and the stress buffer layer is provided with a hollowed-out structure in the non-display area.

Drawings

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

Fig. 1 is a schematic diagram of a film structure of an OLED display panel according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a bending process of a film structure of a non-display area of an OLED display panel according to an embodiment of the present invention.

Fig. 3 and fig. 4 are schematic top views of a hollow structure of a non-display area of an OLED display panel according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of an external drain terminal structure of a non-display area of an OLED display panel according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of another film structure of a supporting member in an OLED display panel according to an embodiment of the invention.

Detailed Description

The following description of the embodiments refers to the accompanying drawings, which 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 ], etc., are only referring to the directions of the attached drawings. Accordingly, directional terminology is used to describe and understand the invention and is not limiting of the invention. In the drawings, like elements are denoted by the same reference numerals, and broken lines in the drawings indicate that they are not present in the structure, and only the shape and position of the structure are described.

The invention aims at the problems that the bending radius of a bending area in the OLED display panel in the prior art is designed smaller, the internal stress generated by a supporting structure of an inner cavity of a bent display module is larger, and poor lamination is easy to occur, and the defect can be solved by the embodiment.

The embodiment of the invention provides an OLED display panel which comprises a display area and a non-display area positioned at one side of the display area, wherein the OLED display panel comprises a display module, a supporting member positioned at the back of the display module and a protective cover plate positioned at one side of the supporting member far away from the display module, wherein the back of the display module is bent to form a containing cavity, the supporting member is positioned in the containing cavity and fills the containing cavity, the supporting member comprises a first supporting film, a second supporting film, a stress buffer layer and a supporting block, wherein the first supporting film, the second supporting film and the stress buffer layer are arranged in a laminated manner, the stress buffer layer is positioned between the first supporting film and the second supporting film, the supporting block is positioned at the side of the stress buffer layer near the bending side of the display module, the stress buffer layer comprises a grid adhesive layer, a foam layer, a flexible layer and a hardening film which are integrally laminated, and the stress buffer layer is provided with a hollowed-out structure in the non-display area.

Specifically, as shown in fig. 1, an embodiment of the present invention provides a schematic film structure of an OLED display panel. The OLED display panel 100 includes a display area 1001 and a non-display area 1002 located at one side of the display area 1001, where the non-display area 1002 in this embodiment is also a binding area, the OLED display panel 100 includes a display module 101, a support member 103 located at the back of the display module 101, and a protective cover 106 located at one side of the support member 103 away from the display module 101, where the back of the display module 101 is bent to form a containing cavity 1011, the support member 103 is located in the containing cavity 1011 and fills the containing cavity 1011, the support member 103 includes a first support film 1031 and a second support film 1033 that are stacked, a stress buffer layer 1032 located between the first support film 1031 and the second support film 1033, and a support block 1034 located at a side of the stress buffer layer 1032 near the bending side of the display module 101, where the stress buffer layer 1032 includes a mesh adhesive layer 10321, a foam layer 10322, a flexible layer 23, and a hardening film 10324 that are integrally stacked, and a portion of the foam layer 10322 is located in the mesh hole 1032, and the stress buffer layer is provided with a hollowed structure in the non-display area 1002. The supporting member of this embodiment is multilayer stack rete, and every layer structure is closely laminated in rather than adjacent rete, reduces whole supporting member's thickness promptly, increases whole supporting member's pliability again to improve supporting member's bending resistance ability.

The stress buffer layer 1032 in this embodiment sets a hollow structure synchronously, when the binding area is extruded, the attaching stress is reduced through the hollow structure, so that the module is ensured to display normally, the cambered surface area of the binding area is defined with a transverse staggered design hollow pattern, the hollow structure design is avoided from being extruded and cannot be recovered, or the cambered surface connecting and bending area of the inner cavity of the binding area is designed longitudinally in a staggered manner, that is, the hollow structure is arranged in the non-display area 1002 along the transverse and/or longitudinal intersection, or the hollow structure rows are distributed in the non-display area 1002, and the hollow structures of any two adjacent rows are arranged in a staggered manner. In other embodiments, the hollow structure is a blind hole or a through hole, and the width of the hollow structure gradually increases in the direction from the edge of the non-display area to the display area of the display module, and the length of the hollow structure is unchanged.

The material of the flexible layer 10323 in the stress buffer layer 1032 in this embodiment is transparent polyimide. The hardened film 10324 is an inorganic film layer or a copper foil, and the material of the inorganic film layer is one material or more than one material of silicon oxide, silicon nitride and silicon oxynitride. The materials of the first support film 1031 and the second support film 1033 are anti-bending transparent materials, preferably transparent PI or PET profiles, and the bending sides of the first support film 1031 and the second support film 1033 near the display module 101 exceed the stress buffer layer 1032. The support block 1034 is attached to the end of the first support film 1031 on one side and attached to the side surface of the stress buffer layer 1032 on the other side, and the support block 1034 is not in contact with the display module 101, and the material of the support block 1034 is preferably rubber.

In addition, a first polarizing layer 1041 and a first optically transparent adhesive layer 105 are further disposed between the support member 103 and the protective cover 106, and a peelable protective film 107 is further disposed on a side of the protective cover 106 away from the support member. The surface of the display module 101 that buckles sets up UV glue film 102, and the play plain noodles of display module 101 is provided with second polarisation layer 1042, and second polarisation layer 1042 and UV glue film 102 same layer set up, and second polarisation layer 1042 is kept away from display module 101 one side still to be provided with second optical transparent glue film 108.

As shown in fig. 2, an embodiment of the present invention provides a schematic diagram of a bending process of a film structure of a partial bonding area of an OLED display panel. In the bending process, along with the large deformation of the protective cover plate 106, the multiple stacked film layers in the supporting member are tightly attached together and also reversibly deformed, so that the stress generated in the whole deformation process is small, and the display quality of the display module 101 is not substantially affected. The invention defines a novel laminated layer, synchronously designs the hollow structure, and in the embodiment, when the binding area is extruded, the hollow structure 1038 and the hollow structure 1039 reduce the attaching stress through the hollow structure, ensure the normal display of the module, remove the conventional foam structure and reinforcing plate combined structure, and integrally design the grid adhesive layer 10321, the foam layer 10322, the flexible layer 10323 and the hardening film 10324, thereby avoiding the situation of film cracking in the extrusion process.

Referring to fig. 3 in combination with fig. 2, the hollow structures are disposed in the non-display area along the transverse direction and/or the longitudinal direction in a crossing manner, and the hollow structures are distributed in a groove shape, for example, the longitudinal hollow structures 10381 and the transverse hollow structures 10382 are staggered, so that the situation that the hollow structures cannot be recovered due to extrusion of the binding area is avoided, and the hollow structures are prepared by laser or knife cutting. Referring to fig. 4 in combination with fig. 2, the hollow structures are arranged in rows in the non-display area 1002, and any two adjacent hollow structures are arranged in a staggered manner, for example, the hollow structures 10391 and the hollow structures 10392 in two adjacent rows are arranged in a staggered manner. Especially when binding and bonding are sent out below the four corners of the display module assembly, the supporting members 103 in the four corners are longitudinally provided with hollow structures, so that extrusion stress caused by bonding is reduced.

As shown in fig. 5, an embodiment of the present invention provides a schematic structure of an external drain terminal of a non-display area of an OLED display panel. The binding end of the display module is connected with a driving unit 300, the driving unit 300 is a control chip and a flexible circuit board, the control chip is attached to the flexible circuit board and is electrically connected with the flexible circuit board, wherein 5 rows of external leakage terminals are exposed in a non-display area of the display module, 5 rows of connection terminals are arranged corresponding to the 5 rows of external leakage terminals of the driving unit, and the 5 rows of external leakage terminals are electrically connected with the 5 rows of connection terminals in a one-to-one correspondence manner. For example, the edge of the non-display area 1002 is provided with a first row of external drain terminals 201, a second row of external drain terminals 202, a third row of external drain terminals 203, a fourth row of external drain terminals 204 and a fifth row of external drain terminals 205, the driving unit 300 is provided with a first row of connection terminals 301, a second row of connection terminals 302, a third row of connection terminals 303, a fourth row of connection terminals 304 and a fifth row of connection terminals 305, a bending part 10021 is arranged between the fifth row of connection terminals 305 and the fifth row of external drain terminals 205, and a hollow structure 1038 or a hollow structure 1039 is arranged in the bending part 10021. The first row of external drain terminals 201 are electrically connected to the first row of connection terminals 301, the second row of external drain terminals 202 are electrically connected to the second row of connection terminals 302, the third row of external drain terminals 203 are electrically connected to the third row of connection terminals 303, the fourth row of external drain terminals 204 are electrically connected to the fourth row of connection terminals 304, and the fifth row of external drain terminals 205 are electrically connected to the fifth row of connection terminals 305.

In the non-display area 1002 (binding area), the 5 rows of external leakage terminals and the 5 rows of connection terminals are bonded together by extrusion, relatively large stress can be generated by the extruded film layer, the stress can be buffered and released by the integrated stress buffer layer in the embodiment, bonding stress is reduced, bonding yield is improved, the phenomenon that an OLED display panel is cracked in the binding process is avoided by the integrated stress buffer layer, and normal display of the display module is ensured.

As shown in fig. 6, an embodiment of the present invention provides another film structure schematic of a supporting member in an OLED display panel. The support member 103 includes a first support film 1031, a second support film 1033, and a stress buffer layer 1032 between the first support film 1031 and the second support film, wherein the stress buffer layer 1032 includes a mesh adhesive layer 10321, a foam layer 10322, a flexible layer, and a hardened film, which are integrally laminated. The flexible layer in this embodiment includes two polyimide laminate film layers, for example, a laminate combination of a polyimide layer 10323-1 and a polyimide layer 10323-2, the polyimide layer 10323-1 and the polyimide layer 10323-2 are laminated together with a Pressure Sensitive Adhesive (PSA), the hardened film includes two copper foil laminate film layers, for example, a laminate combination of a copper foil 10324-1 and a copper foil 10324-2, the copper foil 10324-1 and the copper foil 10324-2 are laminated together with a Pressure Sensitive Adhesive (PSA), the materials of the first support film 1031 and the second support film 1033 are transparent Polyimide (PI) and a Pressure Sensitive Adhesive (PSA), or the materials of the first support film 1031 and the second support film 1033 are PET profiles and a Pressure Sensitive Adhesive (PSA).

The supporting member comprises a first supporting film, a second supporting film, a stress buffer layer and a supporting block, wherein the first supporting film and the second supporting film are arranged in a laminated mode, the stress buffer layer is located between the first supporting film and the second supporting film, the supporting block is located on the side, close to the bending side of the display module, of the stress buffer layer, the stress buffer layer comprises a grid adhesive layer, a foam layer, a flexible layer and a hardening film which are integrally arranged in a laminated mode, the stress buffer layer is provided with a hollowed-out structure in a non-display area, the conventional foam structure and reinforcing plate combined structure is designed into the integrated stress buffer layer, the phenomenon that an OLED display panel is broken in the binding extrusion process is avoided, the binding stress is reduced through the hollowed-out structure, the binding yield is improved, and the display module is guaranteed to normally display.

In summary, although the present invention has been described in terms of the preferred embodiments, the above-mentioned embodiments are not intended to limit the invention, and those skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention, so that the scope of the invention is defined by the appended claims.

Claims

1. An OLED display panel, comprising a display area and a non-display area located on one side of the display area, characterized in that it comprises a display module, a support member located at the back of the display module, and a protective cover plate located at a side of the support member away from the display module;

The display module is bent at its back to form an accommodating cavity, the supporting member is located in the accommodating cavity and fills the accommodating cavity; the supporting member includes a first supporting film and a second supporting film which are stacked, a stress buffer layer located between the first supporting film and the second supporting film, and a supporting block located at the side of the stress buffer layer close to the bending side of the display module, and the supporting block is attached to the side of the stress buffer layer;

Among them, in the direction from the first supporting film to the second supporting film, the stress buffer layer includes a grid glue layer, a foam layer, a flexible layer and a hardened film that are integrally stacked, and the stress buffer layer is provided with a hollow structure in the non-display area.

2. The OLED display panel according to claim 1 is characterized in that the hollow structures are cross-arranged in the non-display area in a horizontal and/or vertical direction; or, the hollow structures are distributed in the non-display area in columns, and the hollow structures in any two adjacent columns are staggered.

3. The OLED display panel according to claim 2 is characterized in that the hollow structure is a blind hole or a through hole, and the width of the hollow structure increases gradually from the edge of the non-display area toward the display area of the display module, and the length of the hollow structure remains unchanged.

4. The OLED display panel according to claim 1, characterized in that the material of the flexible layer is transparent polyimide, the hardened film is an inorganic film layer or copper foil, and the material of the inorganic film layer is one or more of silicon oxide, silicon nitride and silicon oxynitride.

5 . The OLED display panel according to claim 1 , wherein the flexible layer comprises two polyimide stacked film layers, and the hardened film comprises two copper foil stacked film layers.

6 . The OLED display panel according to claim 1 , wherein the materials of the first supporting film and the second supporting film are both anti-bending transparent materials.

7. The OLED display panel according to claim 1 is characterized in that the first supporting film and the second supporting film are closer to the bending side of the display module and extend beyond one side of the stress buffer layer, and one side of the supporting block is attached to the end of the first supporting film, and the other side is attached to the side of the stress buffer layer; and the supporting block is not in contact with the display module.

8. The OLED display panel according to claim 1, characterized in that a first polarizing layer and a first optically transparent adhesive layer are further provided between the supporting member and the protective cover plate, and a peelable protective film is further provided on a side of the protective cover plate away from the supporting member.

9. The OLED display panel according to claim 8, characterized in that a UV adhesive layer is disposed on the surface of the bent display module, a second polarizing layer is disposed on the light emitting surface of the display module, and the second polarizing layer and the UV adhesive layer are disposed on the same layer.

10. The OLED display panel according to claim 1 is characterized in that the binding end of the display module is connected to a driving unit; wherein, the non-display area of the display module exposes 5 rows of leakage terminals, and the driving unit is provided with 5 rows of connecting terminals corresponding to the 5 rows of leakage terminals, and the 5 rows of leakage terminals are electrically connected to the 5 rows of connecting terminals in a one-to-one correspondence.