CN112951890B

CN112951890B - Display panel and display device

Info

Publication number: CN112951890B
Application number: CN202110184117.XA
Authority: CN
Inventors: 张允题
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-02-10
Filing date: 2021-02-10
Publication date: 2022-11-08
Anticipated expiration: 2041-02-10
Also published as: CN112951890A

Abstract

The application discloses display panel and display device, display panel has a plane display area, four curved surface display areas and a terminal area, the terminal area includes first bending area and second bending area, display panel includes: the first substrate is provided with at least one first opening, and the first opening is positioned in the first bending area; the wiring layer is arranged on the first substrate and comprises a metal wiring extending from the planar display area to the terminal area, and at least one second opening which corresponds to or is staggered with the first opening is arranged on the metal wiring; a filling gasket, so that the bending angle of the second bending area is less than or equal to 150 degrees. The first opening can reduce the bending stress applied to the terminal area while ensuring the supporting force of the first substrate, and the second opening reduces the bending stress applied to the metal wiring to prevent the metal wiring from being broken.

Description

Display panel and display device

Technical Field

The application relates to the technical field of display, in particular to a display panel and a display device.

Background

With the change of aesthetic level of people and the development of mobile terminal products, people gradually pursue the appearance of mobile phone terminals with mellow curves, and a plurality of curved screen terminals appear in the market, such as samsung S9, millet CC 9 pro, vivo nex3, hua Mate 30, and the like, wherein the mobile phone terminals are both curved at two sides, namely double-curved. The double-faced curved screen has various products and perfect technical research, the four-faced curved screen gradually becomes a market hotspot due to the advantages of more beautiful arcs, differentiated appearance, no frame on four sides in front view and the like, and the four-faced curved screen is one of the inevitable trends in the development of mobile phone terminals.

The bottom of a conventional non-curved screen and a left-right hyperbolic screen is provided with a dense routing area and a binding area which are called as terminal areas or external routing areas. Typically, to narrow the lower border of the display screen, it is necessary to bend the terminal areas to the back of the flexible panel. After bending, the terminal area and the non-terminal area at the lower boundary are parallel to each other, so that the stress state is single, and the process is mature only by carrying out the hole-opening wire-changing design of metal signal wiring and the filling of organic photoresist in the bending area to reduce the bending stress.

The upper, lower, left and right sides of the four-curved-surface screen cover plate are curved surfaces, as shown in fig. 1, the bending angle of the subsequent curved-surface screen is larger and larger, and at present, the bending angle is basically more than 80 degrees, and even more than 160 degrees. At the lower boundary department terminal area of display panel, can get into apron curved surface display area after buckling, the laminating of the district of buckling in the terminal area is the curved state on the apron this moment. However, since the metal wires in the terminal area at the lower boundary of the OLED display panel are dense and the bent portion is bent at a large angle, in order to prevent the metal wires from being broken due to a large stress, the organic photoresist is filled in the bent area and the metal wires are perforated and replaced to relieve the stress. However, there is no special design for the region except the bending region in the terminal region, and the metal trace will face the risk of breaking due to bending stress when the region enters the curved surface.

Therefore, the prior art has defects and needs to be improved urgently.

Disclosure of Invention

An object of the present application is to provide a display panel to solve the problem that the metal wire in the prior art will face the risk of cracking caused by bending stress, thereby improving the yield of the display panel.

In order to solve the above problem, the present application provides a display panel, which has a flat display area, four curved display areas surrounding the flat display area, and a terminal area extending from one of the curved display areas, wherein the terminal area includes a first bending area and a second bending area, and the display panel includes: the first substrate is provided with at least one first opening, and the first opening is positioned in the first bending area; the wiring layer is arranged on the first substrate and comprises a metal wiring extending from the planar display area to the terminal area, and at least one second opening which corresponds to or is staggered with the first opening is formed in the metal wiring; and the filling gasket is arranged in an area surrounded by the terminal area and the back surface of the curved display area adjacent to the terminal area, so that the bending angle of the second bending area is smaller than or equal to 150 degrees.

Optionally, in some embodiments of the present application, the display panel further includes: and the buffer layer is arranged between the first substrate and the wiring layer.

Optionally, in some embodiments of the present application, the display panel further includes: the second substrate is arranged between the buffer layer and the wiring layer; at least one third opening is formed in the buffer layer, and the third opening is located in the terminal area.

Optionally, in some embodiments of the present application, the filling pad includes a plane and a curved surface, and junctions of the plane and the curved surface respectively correspond to the first bending region and the second bending region; wherein the curvature of the curved surface is the same as the curvature of the curved surface display area.

Optionally, in some embodiments of the present application, the display panel further includes: and the driving chip is arranged in the terminal area of the display panel and is correspondingly arranged on the plane of the filling gasket.

Optionally, in some embodiments of the present application, a bending radius of the first bending area and the second bending area is greater than or equal to 0.3mm.

Optionally, in some embodiments of the present application, the first aperture comprises at least one of a rounded hexagonal aperture, a circular aperture, an elliptical aperture, a rectangular aperture, a diamond aperture, a parallelogram aperture, a triangular aperture; the second openings comprise elliptical holes or elliptical double rows of holes.

Optionally, in some embodiments of the present application, an aperture of the first opening in the first direction is greater than or equal to an aperture in the second direction.

Correspondingly, the application also provides a display device, which comprises the display panel in any embodiment.

Optionally, in some embodiments of the present application, the display device further includes: the polaroid is arranged on one side of the display panel and covers the planar display area and the curved surface display area; the curved surface cover plate is arranged on one side of the polaroid, which is far away from the display panel; the heat dissipation composite layer is arranged on one side of the display panel, which is far away from the polaroid; the flexible circuit board is bound with the terminal area of the display panel and is positioned on the back of the plane display area after the terminal area is bent; and the protective layer covers the second bending area.

In summary, in the display panel and the display device according to the present application, in the first bending region of the terminal region, the first substrate is provided with at least one first opening, the metal trace is provided with at least one second opening, the first opening can reduce the bending stress received in the terminal region while ensuring the supporting force of the first substrate, and the second opening reduces the bending stress received by the metal trace to prevent the metal trace from being broken; the display panel is further provided with a buffer layer, the buffer layer is provided with at least one third opening in the terminal area, and the third opening can further reduce the bending stress applied to the terminal area; in addition, this application display panel can also pass through the setting of packing the gasket suitably increases first bending zone with the bend radius of second bending zone makes first bending zone with the pitch arc length of second bending zone increases, it makes to fill the gasket the angle of buckling of second bending zone is less than or equal to 150, reduces further first bending zone with the bending stress that second bending zone received can also guarantee display panel the stability in terminal area is difficult for taking place to warp.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of a conventional four-curved panel.

Fig. 2 is a schematic plan view of a display panel provided in the present application.

FIG. 3 is a schematic cross-sectional view of the display panel of FIG. 2 along line B-B' in the terminal area.

Fig. 4 is a schematic cross-sectional view of the display panel provided in fig. 2 along line B-B' in the terminal area.

Fig. 5 is a schematic plan view of the first substrate of the display panel shown in fig. 2 after enlargement of an area a of the terminal area, so as to clearly show the shape of the first opening.

Fig. 6 is a schematic diagram of a wiring layer plane structure of the display panel provided in fig. 2 after enlargement of an area a of the terminal area to clearly show the shape of the second opening.

Fig. 7 is a schematic partial structure diagram of a display device provided in the present application.

The main reference numerals in the above figures are explained as follows:

1. a display device; 10. a display panel; 11. a flat display area; 12. a terminal region; 13. a curved surface display area; 20. a polarizer; 30. a curved cover plate; 40. transparent optical cement; 50. a heat dissipation composite layer; 60. a flexible circuit board; 70. a driver chip; 80. filling a gasket; 81. a plane; 82. a curved surface; 90. a protective layer; 100. a backsheet film; 110. a first substrate; 111. a first opening; 120. a wiring layer; 121. a metal wiring; 122. a second opening; 123. a first bending region; 124. a second bending region; 130. a second substrate; 140. A buffer layer; 141. a third opening; x, a first direction; y, second direction.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Specifically, referring to fig. 2 to fig. 6, the present application provides a display panel 10, which has a flat display area 11, four curved display areas 13 surrounding the flat display area, and a terminal area 12 extending from one of the curved display areas 13, where the terminal area 12 includes a first bending area 123 and a second bending area 124, and the display panel 10 includes: a first substrate 110, wherein the first substrate 110 is provided with at least one first opening 111, and the first opening 111 is located in the first bending region 123; a routing layer 120, where the routing layer 120 is disposed on the first substrate 110, and includes a metal trace 121 extending from the flat display area 11 to the terminal area 12, and the metal trace 121 is provided with at least one second opening 122 corresponding to or staggered from the first opening 111; a filling pad 80 disposed in the region enclosed by the terminal area 12 and the back surface of the curved display area 13 adjacent to the terminal area 12, so that the bending angle α (see fig. 7) of the second bending area 124 is less than or equal to 150 °. It should be noted that, in the present embodiment, the first opening 111 and the second opening 122 are only disposed in the first bending region 123, and are not disposed in the second bending region 123. The first opening 111 can reduce the bending stress applied to the terminal area 12 while ensuring the supporting force of the first substrate 100, and the second opening 122 reduces the bending stress applied to the metal trace 121, thereby preventing the metal trace 121 from being broken; the filling pad 80 makes the bending angle of the second bending region 124 less than or equal to 150 °, further reduces the bending stress applied to the second bending region 124, indirectly reduces the bending stress of the first bending region 123, and also ensures the stability of the terminal region 12 of the display panel 10, and is not easy to deform.

As will be understood by those skilled in the art, the at least one first opening 111 or the at least one second opening 122 specifically refers to: the first opening 111 or the second opening 122 may be one or a plurality of openings. Preferably, the first opening 111 or the second opening 122 is plural, for example, a plurality of the first openings 111 are distributed in the first substrate 110 in an array, and a plurality of the second openings 122 are distributed in the metal trace 121 in an array.

In the present application, the first direction is defined as X and the second direction is defined as Y. The aperture of the first opening 111 in the first direction X is greater than or equal to the aperture in the second direction Y (here, the aperture refers to the farthest vertical distance between two end points of any one of the first openings 111 in the first direction X or the second direction Y). Since the display panel 10 is bent along the second direction Y and perpendicular to the first direction X in the terminal area, the aperture of the first opening 111 in the first direction X is greater than or equal to the aperture in the second direction Y, so that the first substrate 110 in the second direction Y can be ensured to meet the support requirement under the bending condition.

As shown in fig. 3, in some embodiments of the present application, the display panel further includes: a buffer layer 140, wherein the buffer layer 140 is disposed between the first substrate 110 and the routing layer 120. The buffer layer 140 is preferably an organic material, which can enhance the adhesion between the routing layer 120 and the first substrate 110. As shown in fig. 4, preferably, the display panel 10 further includes: a second substrate 130, wherein the second substrate 130 is disposed between the buffer layer 140 and the routing layer 120; when the second substrate 130 is disposed, at least one third opening 141 is disposed on the buffer layer 140, and the third opening 141 is located in the terminal area 12. It is understood that at least one layer between the first substrate 110 and the routing layer 120 is not provided with an opening. Therefore, when a film is further added between the second substrate 130 and the routing layer 120, the second substrate 130 may also be provided with an opening. The third opening 141 may reduce a bending stress received in the terminal area 12 while ensuring a supporting force for the first substrate 100 and the second substrate 130. Similarly, the at least one third opening 141 specifically refers to: the third opening 141 may be one or more holes. Preferably, the third openings 141 are a plurality of holes, and the third openings 141 are distributed in the buffer layer 140 in an array.

It will be understood by those skilled in the art that the relationship among the first opening 111, the second opening 122 and the third opening 141 is not limited in the present application, in other words, the first opening 111, the second opening 122 and the third opening 141 are independent of each other, for example: orthographic projections of the first opening 111, the second opening 122 and the third opening 141 on the second substrate 130 may coincide; orthographic projections of the first opening 111, the second opening 122 and the third opening 141 on the second substrate 130 may be mutually staggered.

As shown in fig. 5, in an embodiment of the present application, the filling pad 80 includes a flat surface 81 and a curved surface 82 (see fig. 7), and the boundaries between the flat surface 81 and the curved surface 82 correspond to the first bending region 123 and the second bending region 124, respectively; wherein the curvature of the curved surface 82 is the same as the curvature of the curved surface display area 13. Due to the arrangement of the filling gasket 80, the bending degree of the second bending area 124 can be relieved, the concentration of stress is prevented, and the problem that the metal wire 121 is broken due to too large bending degree is avoided.

In an embodiment of the present application, the display panel 10 further includes: a driving chip 70 (see fig. 7), wherein the driving chip 70 is disposed in the terminal region 12 of the display panel 10 and correspondingly disposed on the plane 81 of the filling pad 80, so as to prevent the problem of generating a mark due to the disposition of the driving chip 70 on the back surface of the flat display region 11, and to enable the driving chip 70 to be disposed smoothly. In the present application, the bending radius of the first bending region 123 and the second bending region 124 is greater than or equal to 0.3mm. By such an arrangement, the bending surfaces of the first bending area 123 and the second bending area 124 can be ensured to be smoother, so that stress concentration is not easily generated, and the risk of breaking the metal trace 121 is reduced.

As shown in fig. 5, fig. 5 is a schematic plan view of the enlarged first substrate in the area a of the display panel shown in fig. 2. In the present application, the cross-sectional pattern of any one of the first openings 111 includes at least one of rounded hexagon, circle, ellipse, rectangle, diamond, parallelogram, and triangle. It will be understood by those skilled in the art that the pattern of the first opening 111 may be a combination of different patterns, such as: the pattern of the first openings 111 on the first substrate 110 has both rounded hexagons and circles; the pattern of the first opening 111 on the first substrate 110 has rounded hexagons, circles, triangles, and the like. It should be noted that, in order to satisfy the requirement that the aperture of the first opening 111 in the first direction X is greater than or equal to the aperture in the second direction Y, the position orientation of the first opening 111 with different cross-sectional patterns should be properly adjusted to meet the requirement, and when the pattern of the first opening 111 is circular, the position orientation of the first opening 111 is not limited.

In some embodiments, the patterns of the first openings 111 are all provided with chamfers, so that the first openings 111 are smooth, and stress concentration can be prevented.

As shown in fig. 6, fig. 6 is a schematic plane structure diagram of the routing layer of the enlarged display panel a area provided in fig. 2. In the present application, the second openings 122 include elliptical holes or elliptical double rows of holes, and the arrangement of the elliptical holes or the elliptical double rows of holes is not limited. It will be understood by those skilled in the art that the second openings 122 may also have the same pattern as the first openings 111, specifically, referring to the shape of the first openings 111.

In some embodiments of the present application, the pattern of the third opening 141 is not limited, and specifically, refer to the first opening 111 in fig. 5, which is not described herein again.

In the present application, the depth of the first opening 111 is equal to the thickness of the first substrate 110, and it can be understood by those skilled in the art that the first opening 111 is a through hole penetrating through the first substrate 110. Further, the depth of the third opening 141 is equal to the thickness of the buffer layer 140; that is, the third opening 141 is a through hole penetrating through the buffer layer 140.

Referring to fig. 7, fig. 7 is a schematic partial structure diagram of a display device provided in the present application. The application also provides a display device 1 comprising the display panel 10.

The display device 1 further includes: the polarizer 20 is arranged on the display panel 10, and is arranged corresponding to the planar display area 11 and the curved display area 13; the curved cover plate 30 is attached to the polarizer 20 through transparent optical cement 40; a heat dissipation composite layer 50 disposed on one side of the display panel 10 on which the backplane film 100 is disposed; a flexible circuit board 60 disposed on one side of the display panel 10 where the heat dissipation composite layer 50 is disposed, and bound to the terminal area 12 of the display panel 10; a protection layer 90, wherein the protection layer 90 covers the first bending region 124.

It should be noted that the heat dissipation composite layer 50 is completely covered in the curved cover 30, and can be overlapped with the flat display area 11 of the display panel 10, so as to dissipate heat to the maximum extent. The protective layer 90 covers the second bending region 124, so as to effectively prevent the metal traces in the second bending region 124 from being broken and corroded by the external environment.

The back plate film 100 is a substrate commonly used in the art, and may be a glass substrate, a polyimide substrate or a film substrate (film substrate); the polarizer 20 and the transparent optical adhesive 40 are common structures in the art, and are not described in detail in this application. The material of the filling gasket 80 is at least one of silicone, rubber and epoxy resin. The material of the protection layer 90 is one or a mixture of more than one of silicon nitride, silicon oxide, silicon oxynitride and aluminum oxide.

The filling pad 80 is disposed in the region surrounded by the terminal region 12 and the flat display region 11, and fills the region to prevent gaps from being generated and affecting the yield of the display device 1. The terminal area 12 of the display panel 10 can be supported to a certain extent, so that the terminal area 12 is relatively stable and is not easy to deform; and the surface of the filling pad 80 for supporting the driving chip 70 is a plane to ensure that the driving chip 70 is not deformed; the surface of the filling gasket 80 close to the curved cover plate 30 is a curved surface with the same curvature as that of the curved cover plate 30; it should be noted that the surfaces of the filling pad 80 are smooth without sharp edges, in other words, the joints between any two adjacent surfaces of the filling pad 80 are provided with chamfers, so as to ensure that the terminal areas 11 of the display panel 10 are not bent perpendicularly.

In summary, in the display panel 10 of the present application, in the terminal area 12, the first substrate 110 is provided with at least one first opening 111, the metal trace 121 is provided with at least one second opening 122, the first opening 111 can reduce the bending stress received in the terminal area 12 while ensuring the supporting force of the first substrate 110, and the second opening 122 reduces the bending stress received by the metal trace 121, so as to prevent the metal trace 121 from being broken; the buffer layer 140 is provided with at least one third opening 141 in the terminal area 12, and the third opening 141 can further reduce the bending stress applied to the terminal area 12; in addition, by the arrangement of the filling pad 80, the bending radius of the first bending area 123 and the second bending area 124 can be properly increased, so that the arc length of the first bending area 123 and the second bending area 124 is increased, the bending stress applied to the first bending area 123 and the second bending area 124 is further reduced, the stability of the terminal area 12 of the display panel 10 can be ensured, and the terminal area is not easily deformed.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The display panel 10 and the display device 1 provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to explain the principles and embodiments of the present application, and the description of the embodiments above is only used to help understand the technical solutions and the core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A display panel has a flat display area, four curved display areas surrounding the flat display area and a terminal area extending from one of the curved display areas, wherein the terminal area includes a first bending area and a second bending area, and the display panel includes:

the first substrate is provided with at least one first opening, and the first opening is positioned in the first bending area;

the wiring layer is arranged on the first substrate and comprises a metal wiring extending from the planar display area to the terminal area, and at least one second opening which corresponds to or is staggered with the first opening is formed in the metal wiring;

the filling gasket is arranged in an area surrounded by the terminal area and the back surface of the curved surface display area adjacent to the terminal area, so that the bending angle of the second bending area is smaller than or equal to 150 degrees;

the filling gasket comprises a plane and a curved surface, and the junctions of the plane and the curved surface respectively correspond to the first bending area and the second bending area; wherein the curvature of the curved surface is the same as the curvature of the curved surface display area.

2. The display panel of claim 1, wherein the display panel further comprises:

and the buffer layer is arranged between the first substrate and the wiring layer.

3. The display panel of claim 2, wherein the display panel further comprises:

the second substrate is arranged between the buffer layer and the wiring layer; at least one third opening is formed in the buffer layer, and the third opening is located in the terminal area.

4. The display panel according to claim 1, wherein the display panel further comprises:

and the driving chip is arranged in the terminal area of the display panel and is correspondingly arranged on the plane of the filling gasket.

5. The display panel according to claim 1, wherein a bending radius of the first bending region and the second bending region is equal to or greater than 0.3mm.

6. The display panel of claim 1, wherein the first aperture comprises at least one of a rounded hexagonal aperture, a circular aperture, an elliptical aperture, a rectangular aperture, a diamond aperture, a parallelogram aperture, a triangular aperture;

the second openings comprise elliptical holes or elliptical double rows of holes.

7. The display panel according to claim 1, wherein an aperture of the first opening in the first direction is larger than or equal to an aperture in the second direction; the first direction is perpendicular to the second direction, and the display panel is bent along the second direction.

8. A display device comprising the display panel according to any one of claims 1 to 7.

9. The display device according to claim 8, wherein the display device further comprises:

the polaroid is arranged on one side of the display panel and covers the planar display area and the curved surface display area;

the curved surface cover plate is arranged on one side of the polaroid, which is far away from the display panel;

the heat dissipation composite layer is arranged on one side of the display panel, which is far away from the polaroid;

the flexible circuit board is bound with the terminal area of the display panel and is positioned on the back of the plane display area after the terminal area is bent;

and the protective layer covers the second bending area.