OLED display panel

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

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an OLED display panel. Background Art

[0002] OLED display panels are widely used in display, lighting, smart wearable and other fields due to their many advantages such as self-luminescence, low driving voltage, high luminous efficiency, short response time, high clarity and contrast, nearly 180° viewing angle, wide operating temperature range, flexible display and large-area full-color display.

[0003] In order to realize the narrow frame solution of OLED display panel, it is mainly realized by bending the binding area so that the driver chip is bent to the back of the display module. The back of the display panel in the existing display module is generally attached with SCF (Super Clean Foam) structure and reinforcement plate. The SCF structure plays a buffering role, and the reinforcement plate plays a fixing role. The height of the bending area of ​​the binding area is generally determined by the thickness of the film layer under the display panel, that is, the thickness of the SCF structure and the thickness of the reinforcement plate. The bending radius of the bending area needs to be designed to be smaller. The SCF structure and the reinforcement plate are close to the inner cavity of the bent display module, and the internal stress generated is large, which is prone to poor fitting and affects the display effect. In the actual fitting of the display panel with four curved surfaces, the binding area is more prone to poor fitting due to its own shape design.

[0004] In summary, a new OLED display panel needs to be proposed to solve the problem that the bending radius of the bending area in the prior art OLED display panel is designed to be small, the supporting structure of the inner cavity of the bent display module generates large internal stress, and poor bonding is prone to occur. Summary of the invention

[0005] Based on the problems of the prior art, the present application provides an OLED display panel, which can solve the problem that the bending radius of the bending area of ​​the OLED display panel in the prior art is designed to be small, the supporting structure of the inner cavity of the bent display module generates large internal stress, and poor bonding is prone to occur.

[0006] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0007] An embodiment of the present invention provides an OLED display panel, which includes a display area and a non-display area located on one side of the display area. The OLED display panel includes a display module, a support structure located on the back of the display module, and a protective cover located on a side of the support structure away from the display module.

[0008] The display module is bent at its back to form a receiving cavity, the supporting member is located in the receiving cavity and fills the receiving cavity; the supporting member includes a first supporting film and a second supporting film that are stacked, a stress buffer layer located between the first supporting film and the second supporting film, and a supporting block located on the stress buffer layer near the bent side of the display module.

[0009] The stress buffer layer includes a grid adhesive layer, a foam layer, a flexible layer and a hardened film which are integrally stacked, and the stress buffer layer is provided with a hollow structure in the non-display area.

[0010] According to a preferred embodiment of the present invention, 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 columns in the non-display area, and the hollow structures in any two adjacent columns are staggered.

[0011] 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 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.

[0012] 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 or more of silicon oxide, silicon nitride and silicon oxynitride.

[0013] According to a preferred embodiment of the present invention, the flexible layer includes two layers of polyimide stacked film layers, and the hardened film includes two layers of copper foil stacked film layers.

[0014] According to a preferred embodiment of the present invention, the materials of the first supporting film and the second supporting film are both anti-bending transparent materials.

[0015] According to a preferred embodiment of the present invention, the first supporting film and the second supporting film extend beyond one side of the stress buffer layer near the bending side of the display module, 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 does not contact the display module.

[0016] According to a preferred embodiment of the present invention, a first polarizing layer and a first optically transparent adhesive layer are further provided between the support member and the protective cover plate, and a peelable protective film is further provided on the side of the protective cover plate away from the support member.

[0017] According to a preferred embodiment of the present invention, a UV adhesive layer is disposed on the bent surface of the 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.

[0018] According to a preferred embodiment of the present invention, the binding end of the display module is connected to a driving unit; wherein, 5 rows of leakage terminals are exposed in the non-display area of ​​the display module, 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.

[0019] Beneficial effects of the present invention: An embodiment of the present invention provides an OLED display panel, which includes a display area and a non-display area located on one side of the display area, and the OLED display panel includes a display module, a supporting member located on the back of the display module, and a protective cover plate located on the side of the supporting member away from the display module; wherein the display module is bent at its back to form a receiving cavity, and the supporting member is located in the receiving cavity and fills the receiving cavity; the supporting member includes a first supporting film and a second supporting film arranged in a stacked manner, a stress buffer layer located between the first supporting film and the second supporting film, and a supporting block located on the side of the stress buffer layer close to the bending side of the display module; wherein the stress buffer layer includes 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 the non-display area; the present invention designs the original foam structure and the reinforcing plate combination 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of a film layer structure of an OLED display panel is provided for an embodiment of the present invention.

[0022] Figure 2 A schematic diagram of a bending process of a film layer structure in a non-display area of ​​an OLED display panel is provided for an embodiment of the present invention.

[0023] Figure 3 and Figure 4 A schematic top view of a hollow structure in a non-display area of ​​an OLED display panel is provided for an embodiment of the present invention.

[0024] Figure 5 A schematic diagram of the structure of leakage terminals in a non-display area of ​​an OLED display panel is provided for an embodiment of the present invention.

[0025] Figure 6Another schematic diagram of a film layer structure of a supporting component in an OLED display panel is provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following descriptions of the embodiments are made with reference to the attached diagrams to illustrate specific embodiments in which the present invention may be implemented. The directional terms mentioned in the present invention, such as [up], [down], [front], [back], [left], [right], [inside], [outside], [side], etc., are only with reference to the directions of the attached diagrams. Therefore, the directional terms used are used to illustrate and understand the present invention, rather than to limit the present invention. In the figures, units with similar structures are represented by the same reference numerals, and the dotted lines in the figures represent those that do not exist in the structure and only illustrate the shape and position of the structure.

[0027] The present invention aims at the fact that the bending radius of the bending area in the prior art OLED display panel is designed to be small, and the supporting structure of the inner cavity of the bent display module generates large internal stress, which is prone to poor bonding. This embodiment can solve this defect.

[0028] An embodiment of the present invention provides an OLED display panel, which includes a display area and a non-display area located on one side of the display area, and the OLED display panel includes a display module, a support member located on the back of the display module, and a protective cover plate located on the side of the support member away from the display module; wherein the display module is bent at its back to form a receiving cavity, and the support member is located in the receiving cavity and fills the receiving cavity; the support member includes a first supporting film and a second supporting film arranged in a stacked manner, a stress buffer layer located between the first supporting film and the second supporting film, and a support block located on the side of the stress buffer layer close to the bending side of the display module; wherein the stress buffer layer includes 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 the 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.

[0029] Specifically, Figure 1As shown, an embodiment of the present invention provides a schematic diagram of the film layer structure of an OLED display panel. The OLED display panel 100 includes a display area 1001 and a non-display area 1002 located on one side of the display area 1001. In this embodiment, the non-display area 1002 is also a binding area. The OLED display panel 100 includes a display module 101, a support member 103 located on the back of the display module 101, and a protective cover plate 106 located on the side of the support member 103 away from the display module 101; wherein the display module 101 is bent at its back to form a receiving cavity 1011, the support member 103 is located in the receiving cavity 1011, and fills the receiving cavity 1011; the support member 103 includes a laminated The first supporting film 1031, the second supporting film 1033, the stress buffer layer 1032 between the first supporting film 1031 and the second supporting film 1033, and the supporting block 1034 located on the bending side of the stress buffer layer 1032 close to the display module 101; the stress buffer layer 1032 includes an integrated stacked grid adhesive layer 10321, a foam layer 10322, a flexible layer 10323 and a hardened film 10324; part of the foam layer 10322 is located in the mesh of the grid adhesive layer 10321, and the stress buffer layer 1032 is provided with a hollow structure in the non-display area 1002. The supporting member of this embodiment is a multi-layer stacked film layer, and each layer structure is closely attached to the adjacent film layer, which reduces the thickness of the entire supporting member and increases the flexibility of the entire supporting member, thereby improving the anti-bending performance of the supporting member.

[0030] The stress buffer layer 1032 of this embodiment is synchronously set with a hollow structure. When the binding area is squeezed, the hollow structure is used to reduce the bonding stress to ensure the normal display of the module. The arc surface area of ​​the binding area defines a horizontally staggered hollow pattern to avoid the hollow structure design being unable to recover after being squeezed, or the arc surface intersection bending area of ​​the binding area is designed to be vertically staggered, that is, the hollow structure is cross-set in the non-display area 1002 along the horizontal and / or vertical direction; or, the hollow structure columns are distributed in the non-display area 1002, and the hollow structures of any two adjacent columns are staggered. In other embodiments, the hollow structure is a blind hole or a through hole, and the width of the hollow structure increases from the edge of the non-display area to the display area of ​​the display module, and the length of the hollow structure remains unchanged. When the binding area of ​​the display module is squeezed, this type of hollow structure can further reduce the bonding stress, improve the bonding yield, and ensure the normal display of the display module.

[0031] 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 copper foil, and the material of the inorganic film layer is one or more materials selected from silicon oxide, silicon nitride and silicon oxynitride. The materials of the first support film 1031 and the second support film 1033 are both anti-bending transparent materials, preferably transparent PI or PET profiles, and the first support film 1031 and the second support film 1033 are close to the bending side of the display module 101 and exceed the side of the stress buffer layer 1032. One side of the support block 1034 is attached to the end of the first support film 1031, and the other side is attached to the side of the stress buffer layer 1032; 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.

[0032] In addition, a first polarizing layer 1041 and a first optically transparent adhesive layer 105 are disposed between the support member 103 and the protective cover plate 106, and a peelable protective film 107 is disposed on the side of the protective cover plate 106 away from the support member. A UV adhesive layer 102 is disposed on the surface of the bent display module 101, and a second polarizing layer 1042 is disposed on the light-emitting surface of the display module 101. The second polarizing layer 1042 is disposed on the same layer as the UV adhesive layer 102, and a second optically transparent adhesive layer 108 is disposed on the side of the second polarizing layer 1042 away from the display module 101.

[0033] like Figure 2 As shown, an embodiment of the present invention provides a schematic diagram of the bending process of the membrane layer structure of a partial binding area of ​​an OLED display panel. During the bending process, as the protective cover plate 106 undergoes a large deformation, the multiple stacked membrane layers in the supporting member are tightly fitted together and also undergo reversible deformation. The stress generated during the entire deformation process is relatively small, and has no substantial impact on the display quality of the display module 101. The present invention defines a new type of stacking and synchronously designs a hollow structure. The hollow structure 1038 and the hollow structure 1039 in this embodiment, when the binding area is squeezed, reduce the fitting stress through the hollow structure to ensure the normal display of the module, remove the conventional foam structure and the reinforcing plate combination structure, and design the grid glue layer 10321, the foam layer 10322, the flexible layer 10323 and the hardened film 10324 as an integrated unit to avoid cracking of the membrane layer during the extrusion process.

[0034] Figure 3 Combination Figure 2 The hollow structure is cross-arranged in the non-display area along the horizontal and / or vertical directions, and the hollow structure is distributed in a groove shape. For example, the vertical hollow structure 10381 and the horizontal hollow structure 10382 are staggered. To avoid the situation where the hollow structure is squeezed by the binding area and cannot be restored, the hollow structure is prepared by laser or knife cutting. Figure 4 Combination Figure 2The hollow structures are arranged in rows in the non-display area 1002, and any two adjacent rows of hollow structures are staggered, for example, two adjacent rows of hollow structures 10391 and 10392 are staggered. In particular, when the four corners of the display module are bound and bonded, the support members 103 in the four corners are longitudinally provided with hollow structures to reduce the extrusion stress caused by bonding.

[0035] like Figure 5 As shown, an embodiment of the present invention provides a schematic diagram of the structure of the leakage terminals in the non-display area of ​​an OLED display panel. The binding end of the display module is connected to a driving unit 300, which is a control chip and a flexible circuit board. The control chip is attached to the flexible circuit board and electrically connected to the flexible circuit board; wherein, the non-display area of ​​the display module has 5 rows of leakage terminals exposed, and the driving unit is provided with 5 rows of connection terminals corresponding to the 5 rows of leakage terminals, and the 5 rows of leakage terminals are electrically connected to the 5 rows of connection terminals in a one-to-one correspondence. For example, the edge of the non-display area 1002 is provided with a first row of external leakage terminals 201, a second row of external leakage terminals 202, a third row of external leakage terminals 203, a fourth row of external leakage terminals 204 and a fifth row of external leakage terminals 205; the driving unit 300 is provided with a first row of connecting terminals 301, a second row of connecting terminals 302, a third row of connecting terminals 303, a fourth row of connecting terminals 304 and a fifth row of connecting terminals 305, a bending portion 10021 is provided between the fifth row of connecting terminals 305 and the fifth row of external leakage terminals 205, and a hollow structure 1038 or a hollow structure 1039 is provided in the bending portion 10021. The first row of external leakage terminals 201 are electrically connected to the first row of connection terminals 301, the second row of external leakage terminals 202 are electrically connected to the second row of connection terminals 302, the third row of external leakage terminals 203 are electrically connected to the third row of connection terminals 303, the fourth row of external leakage terminals 204 are electrically connected to the fourth row of connection terminals 304, and the fifth row of external leakage terminals 205 are electrically connected to the fifth row of connection terminals 305.

[0036] In the above-mentioned non-display area 1002 (binding area), 5 rows of leakage terminals and 5 rows of connection terminals are extruded and bonded together. The extruded film layer will produce relatively large stress. The integrated stress buffer layer in this embodiment can buffer and release the stress, reduce the bonding stress, and improve the bonding yield. The integrated stress buffer layer can avoid the cracking phenomenon of the OLED display panel during the binding process, thereby ensuring the normal display of the display module.

[0037] like Figure 6As shown, an embodiment of the present invention provides another schematic diagram of a film layer structure of a support 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 located between the first support film 1031 and the second support film; wherein the stress buffer layer 1032 includes an integrated grid glue layer 10321, a foam layer 10322, a flexible layer, and a hardened film. The flexible layer in this embodiment includes two layers of polyimide stacked film layers, for example, a stacked combination of polyimide layer 10323-1 and polyimide layer 10323-2, and the polyimide layer 10323-1 and the polyimide layer 10323-2 are bonded together using a pressure-sensitive adhesive (PSA); the hardened film includes two layers of copper foil stacked film layers, for example, a stacked combination of copper foil 10324-1 and copper foil 10324-2, and the copper foil 10324-1 and the copper foil 10324-2 are bonded together using a pressure-sensitive adhesive (PSA); the material of the first support film 1031 and the second support film 1033 is transparent polyimide (PI) and pressure-sensitive adhesive (PSA), or the material of the first support film 1031 and the second support film 1033 is PET profile and pressure-sensitive adhesive (PSA).

[0038] As described above, the supporting structure of the embodiment of the present invention 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 on the bending side of the stress buffer layer close to the display module; wherein the stress buffer layer includes 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 the non-display area; the conventional foam structure and the reinforcing plate combination structure are designed into an integrated stress buffer layer to avoid the phenomenon of cracking of the OLED display panel during the binding and extrusion process, and the bonding stress is reduced by the hollow structure, thereby improving the bonding yield and ensuring the normal display of the display module.

[0039] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the 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 includes 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, characterized in that: The hollow structures are cross-arranged in the non-display area in a horizontal direction and / or a 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, 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 to 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 materials selected from silicon oxide, silicon nitride and silicon oxynitride.

5. The OLED display panel according to claim 1, characterized in that: The flexible layer includes two layers of polyimide stacked film layers, and the hardened film includes two layers of copper foil stacked film layers.

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

7. The OLED display panel according to claim 1, characterized in that: The first supporting film and the second supporting film extend beyond one side of the stress buffer layer near the bending side of the display module, 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 does not contact 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 arranged between the supporting member and the protective cover plate, and a peelable protective film is further arranged 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 arranged on the bent surface of the display module, a second polarizing layer is arranged on the light-emitting surface of the display module, and the second polarizing layer and the UV adhesive layer are arranged on the same layer.

10. The OLED display panel according to claim 1, 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.

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