CN111063257A - Flexible display panel and manufacturing method thereof - Google Patents
Flexible display panel and manufacturing method thereof Download PDFInfo
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- CN111063257A CN111063257A CN201911225291.3A CN201911225291A CN111063257A CN 111063257 A CN111063257 A CN 111063257A CN 201911225291 A CN201911225291 A CN 201911225291A CN 111063257 A CN111063257 A CN 111063257A
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- 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
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Abstract
The invention provides a flexible display panel and a manufacturing method thereof, wherein the flexible display panel is provided with a display area, a non-display area and a bending area arranged between the display area and the non-display area, the flexible display panel comprises a substrate and at least one signal wire arranged on the substrate, each signal wire comprises at least two metal layers and an insulating layer arranged between two adjacent metal layers in the bending area, orthographic projections of the at least two metal layers on the substrate are not overlapped, the insulating layer is made of a low-modulus organic material, the increase of rigidity can be effectively relieved, the signal wire is prevented from being broken, the impedance is reduced, and the narrow border of the flexible display panel is favorably realized.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel and a manufacturing method thereof.
Background
With the rapid development of the display industry, the flexible display technology has leap forward in recent years, the narrow frame technology has also been developed in a crossing manner while the pixel density (pixelper inc, PPI) is rapidly increased, the flexible display technology can reduce the size of the lower frame through the Pad bending technology, and full-screen frameless display products are emerging along with the continuous improvement of the demand of consumers for display products and the continuous development of the narrow frame technology.
However, in the technology of pursuing a narrow frame, when the pad bonding is implemented, the problem of disconnection and high impedance of signal routing is easily caused due to the fact that the bending radius of the bending area is smaller and smaller, and abnormal display is caused.
In summary, it is desirable to provide a new flexible display panel and a method for manufacturing the same to solve the above-mentioned problems.
Disclosure of Invention
The invention provides a flexible display panel and a manufacturing method thereof, and aims to solve the technical problems that signal routing in a bending area of the conventional flexible display panel is easy to break and the impedance is high.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
the embodiment of the invention provides a flexible display panel, which is provided with a display area, a non-display area and a bending area arranged between the display area and the non-display area, and comprises:
a substrate base plate; and
the signal routing lines are arranged on the substrate base plate, each signal routing line comprises at least two metal layers and an insulating layer arranged between every two adjacent metal layers in the bending area, and orthographic projections of the at least two metal layers on the substrate base plate are not overlapped with each other.
According to the flexible display panel provided by the embodiment of the invention, each signal wire comprises a first metal layer and a second metal layer, a first insulating layer is arranged between the first metal layer and the second metal layer, the first metal layer is arranged on the substrate, and the second metal layer is arranged on the first insulating layer.
According to the flexible display panel provided by the embodiment of the invention, the first insulating layer is provided with at least one through hole, and the first metal layer and the second metal layer are electrically connected through the through hole.
According to the flexible display panel provided by the embodiment of the invention, the bending area comprises a first bending section, a second bending section and a third bending section, the first bending section is close to the display area, the third bending section is close to the non-display area, the second bending section is positioned between the first bending section and the third bending section, and the curvature radius of the second bending section is greater than that of the first bending section and that of the third bending section.
According to the flexible display panel provided by the embodiment of the invention, the thickness of the first metal layer corresponding to the second bending section is greater than the thickness of the first metal layer corresponding to the first bending section and the third bending section; the thickness of the second metal layer corresponding to the second bending section is greater than the thickness of the second metal layer corresponding to the first bending section and the third bending section.
According to the flexible display panel provided by the embodiment of the invention, the first insulating layer is made of an organic material.
According to the flexible display panel provided by the embodiment of the invention, the second metal layer is further provided with a second insulating layer, and the second insulating layer is provided with a protective layer.
The embodiment of the invention provides a manufacturing method of a flexible display panel, which comprises the following steps:
step S10: forming a first metal layer in a bending area of the substrate base plate;
step S20: forming a first insulating layer on the first metal layer; and
step S30: and forming a second metal layer on the first insulating layer.
According to the manufacturing method of the flexible display panel provided by the embodiment of the invention, the step S10 includes:
step S101: evaporating and etching a first conductive layer on the substrate base plate to form the first metal layer;
the step S30 includes:
step S301: and evaporating and etching a second conductive layer on the first metal layer to form the second metal layer.
According to the manufacturing method of the flexible display panel provided by the embodiment of the invention, at least one through hole is formed on the first insulating layer by adopting a through hole process, and the first metal layer and the second metal layer are electrically connected through the through hole.
The invention has the beneficial effects that: according to the flexible display panel and the manufacturing method thereof, the signal routing in the bending area is set to be at least two metal layers, orthographic projections of the at least two metal layers on the substrate are not overlapped, and the low-modulus insulating layer is arranged between the two adjacent metal layers, so that the increase of rigidity can be effectively relieved, the signal routing is prevented from being broken, the impedance is reduced, and the narrow frame of the flexible display panel is favorably realized.
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 plan view of a flexible display panel according to an embodiment of the present invention;
fig. 2 is a schematic view of a bending structure of a flexible display panel according to an embodiment of the present invention;
fig. 3 is a schematic diagram of signal routing arrangement of a bending region of a flexible display panel according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure view of a bending region of a flexible display panel according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional structure view of a bending region of a flexible display panel in a bent state according to an embodiment of the present invention;
fig. 6 is a schematic diagram of signal routing layout of a bending region of another flexible display panel according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional structure view of a bending region of another flexible display panel according to an embodiment of the present invention;
fig. 8 is a flowchart of a method for manufacturing a flexible display panel according to an embodiment of the present invention.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that 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 ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.
The invention aims at the problems that signal wiring in a bending area of a flexible display panel in the prior art is easy to break and high in impedance, and the embodiment can solve the defects.
As shown in fig. 1, the Flexible display panel according to an embodiment of the present invention includes a display area 1, a non-display area 2, and a bending area 3 disposed between the display area 1 and the non-display area 2, where the display area 1 is used for displaying an image, the bending area 3 may or may not display an image, and the non-display area 2 is used for placing an Integrated Circuit (IC) area or a Flexible Printed Circuit (FPC) or the like.
As shown in fig. 2, the flexible display panel may be bent along the bending region 3 to bend the non-display region 2 to the back of the display region 1, so as to reduce the size of the lower frame.
The flexible display panel comprises a substrate 101, wherein the substrate 101 is a flexible substrate, and the material of the flexible substrate can be selected from polyimide (PI film) and other organic materials with flexibility or bendable characteristics.
The flexible display panel further includes a first backplane 102 and a second backplane 103 disposed inside the substrate base 101, the first backplane 102 is located in the display area 1, the second backplane 103 is located in the non-display area 2, and a support layer 104 is disposed between the first backplane 102 and the second backplane 103 and used for supporting the flexible display panel.
At least one signal wire 105 is further disposed on the outer side of the substrate base plate 101, the signal wire 105 passes through the bending region 3 from the display region 1 and extends to the non-display region 2, one end of the signal wire 105 is connected to a thin film transistor device in the display region 1, and the other end of the signal wire 105 opposite to the thin film transistor device is connected to an IC or an FPC.
Each signal trace 105 includes a single metal layer in the display region 1 and the non-display region 2, each signal trace 105 includes at least two metal layers in the bending region 3, and an insulating layer is further disposed between every two adjacent metal layers.
Specifically, in the embodiment of the present invention, each of the signal traces 105 includes two metal layers in the bending region 3, that is, a first metal layer 1051 and a second metal layer 1052, as shown in fig. 3, the signal traces 105 in the bending region 3 of the flexible display panel are arranged schematically, and orthographic projections of the first metal layer 1051 and the second metal layer 1052 on the substrate base plate 101 are adjacently disposed.
As shown in fig. 4, a first insulating layer 106 is disposed between the first metal layer 1051 and the second metal layer 1052, the first metal layer 1051 is disposed on the substrate 101, and the second metal layer 1052 is disposed on the first insulating layer 106.
When the bending region 3 is bent, compared with the display region 1 and the non-display region 2, the signal trace 105 located in the bending region 3 is easily broken due to a large bending stress on the signal trace 105, so that the signal trace 105 provided by the embodiment of the invention is provided with a double-layer metal layer, and the risk of breaking the signal trace 105 can be reduced; meanwhile, even if any one of the first metal layer 1051 and the second metal layer 1052 is broken, a signal can be transmitted through the other unbroken metal layer, thereby improving the service life of the flexible display panel; furthermore, the first metal layer 1051 and the second metal layer 1052 are connected in parallel, so that the impedance of the signal trace 105 can be reduced.
Further, since the signal trace 105 is configured as a double-layer metal layer, compared with the prior art, the thickness of the signal trace is increased, so that orthographic projections of the first metal layer 1051 and the second metal layer 1052 on the substrate 101 are not overlapped with each other, so as to alleviate the problem of rigidity increase caused by the increase of the thickness of the signal trace 105, and further avoid the signal trace 105 from being broken, specifically, the thickness of the first metal layer 1051 and the second metal layer 1052 is 0.5um-1.0 um.
Referring again to fig. 2, the bending zone 3 comprises a first bending section 31, a second bending section 32 and a third bending section 33, the first bending section 31 is close to the display area 1, the third bending section 33 is close to the non-display area 2, the second bend 32 is located between the first bend 31 and the third bend 33, and in order to obtain a narrower border, the bend radius of the bending zone 3 tends to become smaller and smaller, the bending zone 3 is bent into a nearly horizontal arc during bending, so that the radius of curvature of the second bend 32 is larger than the radii of curvature of the first bend 31 and the third bend 33, the first bend 31 and the third bend 33 are subjected to bending stresses that are greater than the bending stresses to which the second bend 32 is subjected, that is, the signal traces 105 corresponding to the first bent section 31 and the second bent section 32 are more prone to be broken.
Further, to solve this drawback, as shown in fig. 4, the thickness of the first metal layer 1051 corresponding to the second bend section 32 is made larger than the thickness of the first metal layer 1051 corresponding to the first bend section 31 and the third bend section 33; the thickness of the second metal layer 1052 corresponding to the second bend 32 is greater than the thickness of the second metal layer 1052 corresponding to the first bend 31 and the third bend 33; by reducing the thickness of the first metal layer 1051 and the second metal layer 1052 corresponding to the first bent segment 31 and the third bent segment 33, respectively, the bending stress of the signal trace 105 corresponding to the first bent segment 31 and the third bent segment 32 can be reduced to a certain extent, thereby reducing the possibility of the signal trace 105 breaking.
Further, at least one via 109 is disposed on the first insulating layer 106, and the first metal layer 1051 and the second metal layer 1052 are electrically connected through the via 109.
In the embodiment of the present invention, holes may be distributed on the first metal layer 1051 and the second metal layer 1052 to reduce the bending stress, but in other embodiments, holes may not be distributed.
Specifically, the material of the first metal layer 1051 and the second metal layer 1052 may be selected from conductive materials, and the first metal layer 1051 and the second metal layer 1052 may be, but not limited to, TI/AL/TI multi-layer metal structures with better flexibility.
Specifically, the first insulating layer 106 is made of an organic material, and may be made of an organic material with low modulus, compressibility and high temperature resistance, including but not limited to a high temperature silicone material with high temperature resistance of more than 300 ℃, and the first insulating layer 106 may release bending stress generated by bending through its own deformation, so as to relieve and avoid the signal trace 105 from breaking, as shown in fig. 5, when the bending region 3 of the flexible display panel is in a bent state, the first insulating layer 106 deforms, and its surface is in a wave shape.
A second insulating layer 107 is further disposed on the second metal layer 1052, a protective layer 108 is disposed on the second insulating layer 107, and the materials of the second insulating layer 107 and the first insulating layer 106 may be the same or different, which should not be construed as a limitation to the embodiment of the present invention.
As shown in fig. 6, which is a schematic layout view of signal traces 105 of another flexible display panel bending region 3 provided by the embodiment of the present invention, each of the signal traces 105 includes three metal layers in the bending region 3, that is, a first metal layer 1051, a second metal layer 1052 and a third metal layer 1053, and orthographic projections of the second metal layer 1052 and the third metal layer 1053 on the substrate base plate 101 are respectively located on two sides of an orthographic projection of the first metal layer 1051 on the substrate base plate 101.
Referring to fig. 7, a first insulating layer 106 is disposed between the first metal layer 1051 and the second metal layer 1052, a second insulating layer 107 is disposed between the second metal layer 1052 and the third metal layer 1053, the first metal layer 1051 is disposed on the substrate 101, the second metal layer 1052 is disposed on the first insulating layer 106, the third metal layer 1053 is disposed on the second insulating layer 107, a third insulating layer 110 is further disposed on the third metal layer 1053, and the protective layer 108 is disposed on the third insulating layer 110.
Specifically, the first insulating layer 106 and the second insulating layer 107 are both made of organic materials, and organic materials with low modulus, compressibility and high temperature resistance can be selected, including but not limited to high temperature silicone materials with high temperature resistance up to 300 ℃, and the first insulating layer 106 and the second insulating layer 107 can release bending stress generated by bending through their own deformation, so as to relieve and avoid the signal trace 105 from breaking; the third insulating layer 110, the first insulating layer 106, and the second insulating layer 107 may be made of the same material or different materials.
It can be understood that each signal trace 105 may further include four, five or more metal layers in the bending region 3, however, the number of metal layers is too large, and the thicker the signal trace 105 is, the more the rigidity is increased; the number of metal layers is too small, and the signal trace 105 is easily broken, so the number of metal layers should be set according to actual conditions.
As shown in fig. 8, an embodiment of the present invention further provides a method for manufacturing a flexible display panel, including the following steps:
step S10: the first metal layer 1051 is formed in the bending region 3 of the base substrate 101.
Specifically, the step S10 includes the steps of:
step S101: evaporating and etching a first conductive layer on the substrate base plate 101 to form the first metal layer 1051;
in step S101, the method further includes: evaporating a buffer layer on the substrate base plate 101, preparing a thin film transistor array layer on the buffer layer corresponding to the display area, evaporating and etching the first conductive layer on the thin film transistor array layer to form the first metal layer 1051; the first conductive layer may be, but is not limited to, a TI/AL/TI multilayer metal structure having good flexibility.
Step S20: a first insulating layer 106 is formed on the first metal layer 1051.
Specifically, the material of the first insulating layer 106 is an organic material, and organic materials with low modulus, compressibility and high temperature resistance can be selected, including but not limited to a high temperature silicone material with high temperature resistance up to 300 ℃.
Step S30: a second metal layer 1052 is formed over the first insulating layer 106.
Specifically, the step S30 includes:
step S301: a second conductive layer is evaporated and etched on the first metal layer 1051 to form the second metal layer 1052.
The material of the second conductive layer may be the same as or different from the material of the first conductive layer, and the second metal layer 1052 may be formed according to the method for preparing the first metal layer 1051.
Further, a second insulating layer 107 is formed on the second metal layer 1052, and a protective layer 108 is formed on the second insulating layer 107.
In the process of manufacturing the flexible display panel, the thickness of each film layer may be adjusted so that the central plane of the flexible display panel is located on the first metal layer 1051 or the second metal layer 1052 as much as possible, or located between the first metal layer 1051 and the second metal layer 1052, where the bending stress applied to the signal trace 105 is the smallest.
The beneficial effects are that: according to the flexible display panel and the manufacturing method thereof provided by the embodiment of the invention, the signal routing in the bending area is set to be at least two metal layers, orthographic projections of the at least two metal layers on the substrate are not overlapped, and a low-modulus insulating layer is arranged between the two adjacent metal layers, so that the increase of rigidity can be effectively relieved, the signal routing is prevented from being broken, the impedance is reduced, and the narrow frame of the flexible display panel is favorably realized.
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 (10)
1. A flexible display panel having a display area, a non-display area, and a bending area disposed between the display area and the non-display area, the flexible display panel comprising:
a substrate base plate; and
the signal routing lines are arranged on the substrate base plate, each signal routing line comprises at least two metal layers and an insulating layer arranged between every two adjacent metal layers in the bending area, and orthographic projections of the at least two metal layers on the substrate base plate are not overlapped with each other.
2. The flexible display panel of claim 1, wherein each signal trace comprises a first metal layer and a second metal layer, a first insulating layer is disposed between the first metal layer and the second metal layer, the first metal layer is disposed on the substrate, and the second metal layer is disposed on the first insulating layer.
3. The flexible display panel according to claim 2, wherein the first insulating layer has at least one via hole disposed thereon, and the first metal layer and the second metal layer are electrically connected through the via hole.
4. The flexible display panel according to claim 2, wherein the bending region comprises a first bending section, a second bending section and a third bending section, the first bending section is close to the display region, the third bending section is close to the non-display region, the second bending section is located between the first bending section and the third bending section, and a radius of curvature of the second bending section is greater than a radius of curvature of the first bending section and the third bending section.
5. The flexible display panel according to claim 4, wherein the thickness of the first metal layer corresponding to the second bend section is greater than the thickness of the first metal layer corresponding to the first bend section and the third bend section; the thickness of the second metal layer corresponding to the second bending section is greater than the thickness of the second metal layer corresponding to the first bending section and the third bending section.
6. The flexible display panel of claim 2, wherein the first insulating layer is an organic material.
7. The flexible display panel of claim 2, wherein a second insulating layer is further disposed on the second metal layer, and wherein a protective layer is disposed on the second insulating layer.
8. A manufacturing method of a flexible display panel is characterized by comprising the following steps:
step S10: forming a first metal layer in a bending area of the substrate base plate;
step S20: forming a first insulating layer on the first metal layer; and
step S30: and forming a second metal layer on the first insulating layer.
9. The method for manufacturing the flexible display panel according to claim 8, wherein the step S10 includes:
step S101: evaporating and etching a first conductive layer on the substrate base plate to form the first metal layer;
the step S30 includes:
step S301: and evaporating and etching a second conductive layer on the first metal layer to form the second metal layer.
10. The method according to claim 8, wherein at least one via hole is formed in the first insulating layer by a via hole process, and the first metal layer and the second metal layer are electrically connected through the via hole.
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| CN112712760A (en) * | 2020-08-05 | 2021-04-27 | 友达光电股份有限公司 | Display panel |
| CN112581871A (en) * | 2020-12-29 | 2021-03-30 | 厦门天马微电子有限公司 | Display panel and display device |
| CN112783377A (en) * | 2021-02-25 | 2021-05-11 | 惠州市华星光电技术有限公司 | Touch panel and touch device |
| CN112783377B (en) * | 2021-02-25 | 2023-02-28 | 惠州市华星光电技术有限公司 | Touch panel and touch device |
| US11853508B2 (en) | 2021-02-25 | 2023-12-26 | Huizhou China Star Optoelectronics Display Co., Ltd. | Touch panel and touch device |
| WO2023000439A1 (en) * | 2021-07-20 | 2023-01-26 | 武汉华星光电半导体显示技术有限公司 | Flexible display panel and display apparatus |
| US12063822B2 (en) | 2021-07-20 | 2024-08-13 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Flexible display panel and display device |
| CN114698232A (en) * | 2022-03-29 | 2022-07-01 | 昆山国显光电有限公司 | Display panel and display device |
| CN114758582A (en) * | 2022-05-17 | 2022-07-15 | 云谷（固安）科技有限公司 | Display panel and manufacturing method thereof |
| CN115240552B (en) * | 2022-07-27 | 2023-11-28 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
| CN115240552A (en) * | 2022-07-27 | 2022-10-25 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
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