CN108847133B - Display panel, display module and electronic device - Google Patents

Display panel, display module and electronic device Download PDF

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Publication number
CN108847133B
CN108847133B CN201810580441.1A CN201810580441A CN108847133B CN 108847133 B CN108847133 B CN 108847133B CN 201810580441 A CN201810580441 A CN 201810580441A CN 108847133 B CN108847133 B CN 108847133B
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region
protective film
display panel
boundary
bending
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CN108847133A (en
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祝翠林
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/844—Encapsulations

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The invention provides a display panel, a display module and an electronic device, wherein the display panel comprises: an array of pixels; a flexible substrate including a first region for disposing the pixel array, a second region, and a bending region between the first region and the second region; a metal trace located over the flexible substrate, the metal trace including a first portion corresponding to the bend region; a protective film over the flexible substrate; wherein the first portion of the metal trace is located between the flexible substrate and at least a portion of the protective film.

Description

Display panel, display module and electronic device
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a display module and an electronic device.
Background
In the modern communication industry, the market demand of products such as mobile phones, televisions, flat panels, notebooks, digital cameras and the like is increasing, various display devices are developing to be bendable, and a flexible bending (bending) process is generally required to be used in the manufacturing of a flexible full-face screen display panel. Since a part of the metal traces of the flexible display panel are disposed in the bending area, after the flexible display panel is bent (as shown in fig. 1), the metal traces in the bending area are easily corroded and scratched.
Therefore, there is a need for a display panel to solve the problems of the prior art.
Disclosure of Invention
The invention provides a display panel, a display module and an electronic device, which can prevent metal wires on the surface of a bending area of the display panel from being corroded and scratched, thereby improving the reliability and competitiveness of products.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
the present invention provides a display panel including:
an array of pixels;
a flexible substrate including a first region for disposing the pixel array, a second region, and a bending region between the first region and the second region;
a metal trace located over the flexible substrate, the metal trace including a first portion corresponding to the bend region;
a protective film over the flexible substrate;
wherein the first portion of the metal trace is located between the flexible substrate and at least a portion of the protective film.
According to a preferred embodiment of the present invention, at least one boundary of the protective film is located between a corresponding boundary of the bending region and a corresponding boundary of the flexible substrate in a top view.
According to a preferred embodiment of the present invention, a boundary of the protective film corresponding to a first direction perpendicular to a bending direction of the bending region is located between a corresponding boundary of the bending region and a corresponding boundary of the flexible substrate in a top view.
According to a preferred embodiment of the present invention, a boundary of the protective film corresponding to a second direction parallel to a bending direction of the bending region is located between a corresponding boundary of the bending region and a corresponding boundary of the flexible substrate in a top view.
According to a preferred embodiment of the present invention, a film encapsulation layer is formed in the first region, the protective film extends toward the first region, and at least a portion of the protective film is formed at an edge portion of the film encapsulation layer.
According to a preferred embodiment of the present invention, the boundary of the film encapsulation layer is an arc surface, and the corresponding boundary of the protection film is lapped on the arc surface.
According to a preferred embodiment of the present invention, a glue layer is formed at a boundary portion between the protective film and the film encapsulation layer.
According to a preferred embodiment of the present invention, the second region includes a binding region therein, the protective film extends toward the binding region, and a portion of the protective film is formed between the bending region and the binding region.
According to a preferred embodiment of the present invention, a length of the protective film extending from the boundary of the bending region to one side of the first region is equal to or greater than a length of the protective film extending from the boundary of the bending region to the other side of the bending region to the second region.
According to a preferred embodiment of the present invention, the material of the protective film is at least one of polyethylene terephthalate and cyclic olefin polymer.
The invention also provides a display module comprising the display panel.
The invention also provides an electronic device comprising the display module.
The invention has the beneficial effects that: according to the display panel, the display module and the electronic device, the protective film is arranged at the position corresponding to the bending area to protect the metal routing of the bending area from being scratched and corroded, and therefore the product competitiveness is improved.
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 structural diagram of a flexible display panel in the prior art;
fig. 2A is a top view of a display panel according to an embodiment of the invention;
FIG. 2B is a schematic view of the display panel of FIG. 2A after bending;
FIG. 3A is a top view of another display panel according to an embodiment of the present invention;
FIG. 3B is a schematic diagram of the display panel of FIG. 3A after bending;
FIG. 4A is a top view of another display panel according to an embodiment of the present invention;
FIG. 4B is a schematic diagram of the display panel of FIG. 4A after bending;
FIG. 5 is a top view of a display panel according to a preferred embodiment of the present invention;
fig. 6A is a schematic structural diagram of a display panel according to a preferred embodiment of the present invention before being bent;
fig. 6B is a schematic structural diagram of the display panel according to the preferred embodiment of the present invention after being bent.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
The flexible display panel provided by the invention can solve the technical problem that the stress neutral axis of the display panel in the bending process can not be balanced, so that the signal wiring in the bending area is easy to break due to larger bending stress.
Referring to fig. 2A to 2B, fig. 2A is a top view of a display panel according to an embodiment of the invention, and fig. 2B is a schematic diagram of the display panel in fig. 2A after being bent. The display panel 20 includes: a flexible substrate 201, the flexible substrate 201 comprising a first region 202, a second region, and a bending region 204 between the first region 202 and the second region; the first region 202 corresponds to a display region of a pixel unit, and the second region includes a binding region 206; a pixel array (not labeled in the figure) prepared on the surface of the flexible substrate 201, the pixel array including a thin film transistor layer, an anode, an OLED light emitting layer and a cathode; the pixel array comprises a plurality of metal wires 207, one end of at least two metal wires 207 is connected with the thin film transistor in the pixel array, and the other end extends to the binding region 206 through the bending region 204; an organic material film (not labeled) disposed on a surface of a portion of the flexible substrate 201 corresponding to the bending region 204 and defining a pixel region; the OLED light-emitting layer (not marked) is prepared on the organic material film layer corresponding to the pixel area; the thin film packaging layer 203 is prepared on the OLED light-emitting layer and used for wrapping the OLED light-emitting layer; the bending region 204 is used for bending the display panel 20 on the side where the binding region 206 is disposed to the back corresponding to the first region 202, and the bending region 204 is disposed parallel to the boundary of the first region 202 adjacent thereto; the protective film 205 is attached to the surface of the organic material film layer corresponding to the bending area 204; the metal trace 207 is sandwiched between the protective film 205 and the organic material film, the metal trace 207 includes a first portion corresponding to the bending region 204, at least a portion of the protective film 205 and the bending region 204 form an overlapping region, the first portion of the metal trace 207 is located in the overlapping region, and the protective film 205 is used for balancing a stress neutral axis of the metal trace 207 in the bending region 204.
At least one boundary of the protective film 205 is located between a corresponding boundary of the bending region 204 and a corresponding boundary of the flexible substrate 201 in a top view, for example, the protective film 205 may extend to a peripheral boundary of the bending region 204 and end at the bending region 204 boundary. Alternatively, the boundary of the protective film 205 corresponding to the first direction perpendicular to the bending direction of the bending region 204 is located between the corresponding boundary of the bending region 204 and the corresponding boundary of the flexible substrate 201, and the other two side boundaries are located within the range of the bending region 204, as shown in the figure.
Alternatively, in a top view, a boundary of the protective film 205 corresponding to a second direction parallel to the bending direction of the bending region 204 is located between a corresponding boundary of the bending region 204 and a corresponding boundary of the flexible substrate 201.
Since the corresponding portion of the flexible substrate 201 corresponding to the bending region 204 is made of an organic material, after the display panel 20 is bent (as shown in fig. 2B), the protective film 205 is attached to the surface of the bending region 204 and is bent along with the bending region 204 and the metal trace 207, in this process, the protective film 205 shares a portion of the bending stress, so that the stress neutral axis of the bending region 204 can be moved upward, thereby balancing the stress neutral axis of the display panel 20, and preventing the metal trace 207 of the bending region 204 from being broken due to a large bending stress. In addition, since the protection film 205 extends to both ends of the bending region 204, both side edges of the bending region 204 can be protected, and cracking caused by excessive edge stress can be prevented.
In addition, a back plate is arranged on the side of the flexible substrate 201 facing away from the OLED light emitting layer, and the back plate comprises a first back plate 208 corresponding to the side of the bending region 204 close to the first region, and a second back plate 209 corresponding to the side of the bending region 204 close to the binding region 206.
Referring to fig. 3A to 3B, fig. 3A is a top view of another display panel according to an embodiment of the invention, and fig. 3B is a schematic diagram of the display panel in fig. 3A after being bent. The scheme is characterized by the difference compared with the scheme shown in FIGS. 2A-2B: the protective film 303 of the display panel 30 extends to the first region 301 of the display panel 30 and ends at the boundary of the first region 301, and at least a part of the protective film 303 is formed at the edge of the thin film encapsulation layer 302. The boundary of the film encapsulation layer 302 is an arc surface, and the corresponding boundary of the protection film 303 is lapped on the arc surface. After bending (as shown in fig. 3B), since the protective film 303 extends from the bending region 304 to the first region 301 to the edge of the thin film encapsulation layer 302, since a multi-layer film structure is prepared on the display panel 30 corresponding to the first region 301, there is a height difference between the display panel 30 corresponding to the first region 301 and the display panel 30 corresponding to the bending region 304, and the design of this scheme may make the stress neutral axis of the display panel 30 from the first region 301 to the bending region 304 smoothly transition to balance the stress neutral axis of the metal traces 305 of the bending region 304. Thereby preventing the metal trace 305 of the bending region 304 from being broken due to a large bending stress.
Referring to fig. 4A to 4B, fig. 4A is a top view of another display panel according to an embodiment of the invention, and fig. 4B is a schematic diagram of the display panel in fig. 4A after being bent. The scheme is characterized by the difference compared with the scheme shown in FIGS. 2A-2B: the protective film 402 in the display panel 40 extends from the bending region 401 to the binding region 403 and ends at the boundary of the binding region 403, and at least a portion of the protective film 402 is formed between the bending region 401 and the binding region 403. After bending (as shown in fig. 4B), the protective film 402 can disperse the bending stress of the bending region 401, and one side of the protective film 402 close to the bonding region 403 is attached between the bending region 401 and the bonding region 403, so that the tensile stress applied to the metal trace 404 between the bending region 401 and the bonding region 403 is further relieved.
Referring to fig. 5, a top view of a display panel according to a preferred embodiment of the invention is shown, and the difference between fig. 5 and fig. 2A is: in the display panel 50, one side of the protective film 504, which is close to the first area 501 of the display panel 50, extends towards the first area 501 and ends at the boundary of the first area 501; one side of the protective film 504 close to the binding region 505 extends towards the binding region 505 and ends at the boundary of the binding region 505; the protective film 504 is formed around the bending region 503 and the bending region 503, and at least a portion of the protective film 504 is formed at an edge portion of the thin film encapsulation layer 502.
As shown in fig. 6A, a schematic structural diagram of a display panel according to a preferred embodiment of the present invention before being bent is shown, where the display panel includes: the flexible substrate 610 is sequentially provided with a thin film transistor layer, an OLED light emitting layer, a thin film packaging layer 603, a touch layer 605, a polarizer 606 and a protective cover plate 608 in a stacking manner; the film packaging layer 603 is adhered to the touch layer 605 through a first OCA glue 604, and the polarizer 606 is adhered to the protective cover plate 608 through a second OCA glue 607; a back plate 602 and a Copper film Graphite Foam layer (hopper & Graphite & Foam) are arranged on one side, back to the OLED light emitting layer, of the flexible substrate 610; one side of the flexible substrate 610 corresponding to the first region of the pixel unit is provided with a bending region 609 and a binding region 611, one end of a part of metal wires in the thin film transistor layer is connected to the thin film transistor, the other end of the metal wires extends to the outside of the corresponding first region and extends to the binding region 611 through the bending region 609, and the binding region 611 is used for binding a circuit board. A protective film 612 attached to the flexible substrate 610 corresponding to the bending region 609, wherein a side of the protective film 612 close to the first region extends to the film encapsulation layer 603 and covers an edge portion of the film encapsulation layer 603, and a side of the protective film 612 close to the bonding region 611 extends to the bonding region 611 and ends at a boundary of the bonding region 611; the protective film 612 selects a film with a proper modulus according to a manufacturing process, is attached to a designated position, and can play a role in balancing stress, and the protective film 612 is prepared at a gap between the touch circuit board 613 of the touch layer 605 and the flexible substrate 610, and can be thinner than UV glue, so that the assembly is tighter, and the product competitiveness is improved.
In addition, an adhesive layer 601 is formed at the interface between the protective film 612 and the film encapsulation layer 603, and the adhesive layer 601 is preferably a UV adhesive layer; the adhesive layer 601 can further protect the edge of the film encapsulation layer 603 from being damaged by bending stress, and the thickness of the boundary portion between the protective film 612 and the film encapsulation layer 603 is increased, so that the stress neutral axis of the bending region 609 can move upwards, the stress neutral axis of the display panel in the first region to the bending region 609 is in smooth transition, the stress neutral axis is further balanced, and the metal wire in the bending region 609 is prevented from being broken due to large bending stress.
Fig. 6B is a schematic structural diagram of the display panel according to the preferred embodiment of the present invention after being bent. In the bending process, the touch circuit board (flexible) 613, the protective film 612, the flexible substrate 610 in the bending area and the metal traces in the area are bent to the back corresponding to the first area; in the process, the arc top of the bending region is stressed maximally, and then the stress on one side of the bending region close to the first region is greater than the stress on one side of the bending region close to the binding region. In the scheme, the length of the protective film 612 extending from the boundary of the bending region to one side of the first region is greater than or equal to the length of the protective film 612 extending from the boundary of the other side of the bending region to the binding region, so that the stress applied to the metal wire can be better relieved, and the stress neutral axis of the metal wire is in smooth transition.
Of course, the length of the protection film 612 extending from the boundary of the bending region to one side of the first region may also be less than the length of the protection film 612 extending from the boundary of the bending region to the other side of the bending region to the binding region, which is not limited herein.
The material of the protective film 612 is not limited to PET (polyethylene terephthalate), COP (cyclic olefin polymer), and the like, and the protective film 612 has advantages of uniform thickness, uniform width, high precision, thin thickness, and the like.
The protective film 612 of the present disclosure can protect both side edges of the bending region to prevent the edge from breaking due to excessive stress, and can also protect the edge of the thin film encapsulation layer to prevent the edge from breaking due to excessive stress; the metal routing can be better prevented from being broken due to overlarge stress at the arc top of the arc of the bending area after bending.
The invention also provides a display module, which comprises a display panel, wherein the display panel comprises: an array of pixels; a flexible substrate including a first region for disposing the pixel array, a second region, and a bending region between the first region and the second region; a metal trace located over the flexible substrate, the metal trace including a first portion corresponding to the bend region; a protective film over the flexible substrate; wherein the first portion of the metal trace is located between the flexible substrate and at least a portion of the protective film. Please refer to the embodiments of the display panel, which will not be described herein.
The invention also provides an electronic device which comprises the display module. The display module assembly includes display panel, display panel includes: an array of pixels; a flexible substrate including a first region for disposing the pixel array, a second region, and a bending region between the first region and the second region; a metal trace located over the flexible substrate, the metal trace including a first portion corresponding to the bend region; a protective film over the flexible substrate; wherein the first portion of the metal trace is located between the flexible substrate and at least a portion of the protective film. Please refer to the embodiments of the display panel, which will not be described herein.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims (8)

1. A display panel, comprising:
an array of pixels;
a flexible substrate including a first region for disposing the pixel array, a second region, and a bending region between the first region and the second region;
a metal trace located over the flexible substrate, the metal trace including a first portion corresponding to the bend region;
the thin film packaging layer is arranged on the pixel array corresponding to the first area;
a protective film disposed on the flexible substrate corresponding to the bending region;
the first part of the metal wire is located between the flexible substrate and at least one part of the protective film, the protective film extends towards the first area of the display panel and is stopped at the boundary of the first area, at least one part of the protective film is formed at the edge part of the thin film packaging layer, the boundary of the thin film packaging layer is an arc surface, and the corresponding boundary of the protective film is lapped on the arc surface.
2. The display panel according to claim 1, wherein a boundary of the protective film perpendicular to a bending direction of the bent region is located between a corresponding boundary of the bent region and a corresponding boundary of the flexible substrate in a top view.
3. The display panel of claim 1, wherein a glue layer is formed at a boundary portion between the protective film and the thin film encapsulation layer.
4. The display panel according to claim 1, wherein the second region includes a binding region therein, wherein the protective film extends toward the binding region, and wherein a portion of the protective film is formed between the bending region and the binding region.
5. The display panel according to claim 1, wherein a length of the protective film extending from the bent region boundary to one side of the first region is equal to or greater than a length of the protective film extending from the bent region to the other side boundary to the second region.
6. The display panel of claim 1, wherein the protective film is made of at least one of polyethylene terephthalate and cyclic olefin polymer.
7. A display module comprising the display panel according to any one of claims 1 to 6.
8. An electronic device, comprising the display module according to claim 7.
CN201810580441.1A 2018-06-07 2018-06-07 Display panel, display module and electronic device Active CN108847133B (en)

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CN109859642B (en) * 2018-12-17 2021-02-09 上海天马微电子有限公司 Display panel and display device
EP4057114B1 (en) 2019-11-04 2024-01-03 BOE Technology Group Co., Ltd. Touch screen, fabrication method therefor, and touch display device
CN111063256A (en) * 2019-11-26 2020-04-24 武汉华星光电半导体显示技术有限公司 Flexible display module and preparation method thereof
CN112038303B (en) * 2020-08-20 2022-11-01 武汉华星光电半导体显示技术有限公司 Flexible display module, manufacturing method thereof and display terminal
CN112908183B (en) * 2021-03-19 2022-04-26 武汉华星光电半导体显示技术有限公司 Display panel, manufacturing method thereof and display device
CN116075878A (en) * 2021-08-27 2023-05-05 京东方科技集团股份有限公司 Display panel, preparation method thereof and display device
CN113920873B (en) * 2021-10-13 2023-06-02 武汉天马微电子有限公司 Display panel and display device
CN114188469B (en) * 2021-12-03 2023-12-29 Tcl华星光电技术有限公司 Display module manufacturing method and display panel

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