WO2020113625A1 - 柔性显示面板及其制作方法 - Google Patents

柔性显示面板及其制作方法 Download PDF

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Publication number
WO2020113625A1
WO2020113625A1 PCT/CN2018/120420 CN2018120420W WO2020113625A1 WO 2020113625 A1 WO2020113625 A1 WO 2020113625A1 CN 2018120420 W CN2018120420 W CN 2018120420W WO 2020113625 A1 WO2020113625 A1 WO 2020113625A1
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WO
WIPO (PCT)
Prior art keywords
area
insulating layer
organic insulating
display panel
flexible display
Prior art date
Application number
PCT/CN2018/120420
Other languages
English (en)
French (fr)
Inventor
彭斯敏
金江江
Original Assignee
武汉华星光电半导体显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US17/278,340 priority Critical patent/US12020600B2/en
Publication of WO2020113625A1 publication Critical patent/WO2020113625A1/zh

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Classifications

    • 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
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/0005—Production of optical devices or components in so far as characterised by the lithographic processes or materials used therefor
    • G03F7/0007—Filters, e.g. additive colour filters; Components for display devices
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/03—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes specially adapted for displays having non-planar surfaces, e.g. curved displays
    • G09G3/035—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes specially adapted for displays having non-planar surfaces, e.g. curved displays for flexible display surfaces
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections

Definitions

  • the invention relates to the field of display technology, in particular to a flexible display panel and a manufacturing method thereof.
  • the flexible display (Flexible Display) is a variable and flexible display device, and bending will not cause any loss to the function of the display.
  • the flexible display has the characteristics of light weight, small size, good flexibility, low power consumption, etc., and can be designed into various electronic products with special properties, such as curved TVs, curling electronic watches, flexible Mobile phones and so on.
  • the narrow border (Narrow border) or even no border of the display device is the mainstream development trend of current display technology.
  • the flexible display product is made on a flexible carrier that can be bent, it is necessary to make a narrow border device. Bend at the edge of the device to achieve the narrow border design of the bonding area, and the bending radius is very small.
  • the binding area is bent backward relative to the display surface AA area, and multiple metal wires are in the bent area for connecting the AA area and the drive circuit to transmit electrical signals To make the AA area glow.
  • the narrow border type display screen is prepared, and the pad area is bent 180 degrees, such as the display screen structure disclosed by LG Company in patent document US9740035B2, and the stress in the bending area is the largest at this time.
  • a large number of metal wires are distributed here, and the metal wires are very sensitive to mechanical forces. If the above-mentioned bending occurs in the area where the wires are arranged, high-strength stretching will cause cracks in the wires and affect the service life of the device.
  • the purpose of the present invention is to provide a flexible display panel, which can reduce the stress on the metal wires in the bending area, increase its flexibility, and prolong the service life of the device.
  • the object of the present invention is also to provide a method for manufacturing a flexible display panel, which can reduce the stress on the metal wires in the bending area, increase its flexibility, and extend the service life of the device.
  • the present invention provides a flexible display panel, which is divided into a display area located in the middle, a binding area located outside the display area, and a bending area located between the display area and the binding area;
  • the flexible display panel includes an organic insulating layer and a metal layer provided on the organic insulating layer;
  • the organic insulating layer is provided with a plurality of protrusions in the bending area, so that the surface of the organic insulating layer is concave and convex in the bending area;
  • the metal layer includes a plurality of metal wires penetrating the bending area, each metal wire covers a part of the protrusions and its surface is in a concave-convex shape corresponding to the organic insulating layer.
  • each protrusion is any one of spherical, square pillar, diamond pillar, trapezoid pillar, square pillar superposition, diamond pillar superposition, and trapezoid pillar superposition;
  • the shapes of the plurality of protrusions are all the same, or the plurality of protrusions include two or more different shapes.
  • the organic layer material of the organic insulating layer is acrylic resin, epoxy resin or polycarbonate resin.
  • the material of the metal layer is one or a combination of molybdenum, chromium, titanium, nickel, copper, silver and magnesium;
  • the structure of the metal layer is a single layer structure or a stacked structure composed of two or more metals.
  • the plurality of protrusions are evenly distributed in the bending zone; or,
  • the density of the protrusions in the bending area gradually decreases from the middle of the bending area to the display area and the binding area on both sides.
  • the invention also provides a method for manufacturing a flexible display panel.
  • the flexible display panel is divided into a display area located in the middle, a binding area located outside the display area, and a display area located between the display area and the binding area
  • the manufacturing method includes the following steps:
  • Step S1 fabricating an organic insulating layer, patterning the organic insulating layer, forming a plurality of protrusions on the organic insulating layer in the bending region, so that the surface of the organic insulating layer is bent at the bending The area is concave and convex;
  • Step S2 a metal layer is deposited and patterned on the organic insulating layer, the metal layer includes a plurality of metal wires penetrating through the bending area, each metal wire covers a part of the protrusion and its surface is organically insulated
  • the layers are correspondingly concave and convex.
  • the shape of each protrusion is any one of a spherical shape, a square pillar, a rhombic pillar, a trapezoidal pillar, a superimposed body of a square pillar, a superimposed body of a rhombic pillar, and a superimposed body of a trapezoidal pillar;
  • the shapes of the plurality of protrusions are all the same, or the plurality of protrusions include two or more different shapes.
  • the organic insulating layer organic layer material is acrylic resin, epoxy resin or polycarbonate resin.
  • the metal layer is patterned using dry etching technology
  • the material of the metal layer is one or a combination of molybdenum, chromium, titanium, nickel, copper, silver, and magnesium;
  • the structure of the metal layer is a single layer structure or a stacked structure composed of two or more metals.
  • the plurality of protrusions are evenly distributed in the bending area; or,
  • the density of the protrusion in the bending area gradually decreases from the middle of the bending area to the display area and the binding area on both sides.
  • the flexible display panel of the present invention includes an organic insulating layer and a metal layer provided on the organic insulating layer, and is divided into a display area located in the middle and a binding area located outside the display area And a bending area between the display area and the binding area, the organic insulating layer is provided with a plurality of protrusions in the bending area so that its surface is concave and convex in the bending area, the metal The layer includes a plurality of metal wires penetrating through the bending area, each metal wire covering a part of the protrusion of the organic insulating layer so that its surface is also concave and convex with the organic insulating layer, when the flexible display panel is in the bending process In the middle, the convex part will release part of the stress, so as to alleviate the stress in the entire bending area, reduce the occurrence of bending cracks of the metal wire, realize the narrow frame effect, and prolong the service life of the device.
  • the surface of the organic insulating layer is concave and convex in the bending area.
  • a metal layer is deposited and patterned on the organic insulating layer. During the preparation of the metal layer, the metal material will be deposited along the lower bumps, so that the surface of each metal wire that covers a part of the bumps also follows the organic insulating layer.
  • Concavo-convex and undulate when the flexible display panel is bent, the convex part will release part of the stress, thereby alleviating the stress in the entire bending area, reducing the occurrence of metal wire bending cracks, achieving the narrow frame effect and extending the service life .
  • FIG. 1 is a schematic top view of the flexible display panel of the present invention
  • FIG. 2 is a schematic top view of a metal wire in a bending area of the first embodiment of the flexible display panel of the present invention
  • FIG. 3 is a schematic cross-sectional view of a bending region of the first embodiment of the flexible display panel of the present invention.
  • FIG. 4 is a schematic cross-sectional view of an organic insulating layer according to a second embodiment of the flexible display panel of the present invention.
  • FIG. 5 is a schematic cross-sectional view of a bending area of a third embodiment of the flexible display panel of the present invention.
  • FIG. 6 is a schematic cross-sectional view of an organic insulating layer according to a fourth embodiment of the flexible display panel of the present invention.
  • FIG. 7 is a schematic cross-sectional view of a bending area of a fifth embodiment of the flexible display panel of the present invention.
  • FIG. 8 is a schematic top view of a metal wire in a bending area of a sixth embodiment of the flexible display panel of the present invention.
  • FIG. 9 is a schematic cross-sectional view of the bending area of the sixth embodiment of the flexible display panel of the present invention.
  • FIG. 10 is a schematic cross-sectional view of the bending area of the seventh embodiment of the flexible display panel of the present invention.
  • FIG. 11 is a schematic top view of a metal wire in a bending area of an eighth embodiment of a flexible display panel of the present invention.
  • FIG. 12 is a schematic flowchart of a method for manufacturing a flexible display panel of the present invention.
  • the first embodiment of the flexible display panel of the present invention is divided into a display area located in the middle 1 , Located in the display area 1 Outer binding zone 3 And located in the display area 1 And binding zone 3 Bending zone 2 ;
  • the flexible display panel includes an organic insulating layer 10 And provided on the organic insulating layer 10 Upper metal layer 20 .
  • the organic insulating layer 10 In the bending zone 2 There are multiple protrusions inside 11 , And the organic insulating layer 10 Of the surface is in the bending zone 2 The inside is concave and convex.
  • the metal layer 20 Including multiple strips running through the bending zone 2 Metal wire twenty one , Each metal wire twenty one All cover part of the bulge 11 And its surface follows the organic insulating layer 10 Correspondingly concave and convex.
  • the protrusion 11 Part will release part of the stress, which can relieve the entire bending 2
  • the stress and reduce the metal wire twenty one The occurrence of bending cracks achieves a narrow frame effect and prolongs the service life of the device.
  • the organic insulating layer 10 The material is organic insulation such as acrylic resin, epoxy resin or polycarbonate resin, which is not limited in the first embodiment of the present invention.
  • the material is conductive material, which can be molybdenum ( Mo ),chromium( Cr ),titanium( Ti ),nickel( Ni ),copper( Cu ),silver( Ag ),magnesium( Mg ), one or more of the combinations are not limited in the first embodiment of the present invention.
  • the metal layer 20 may be a single-layer structure or a stacked structure composed of two or more metals, which is not limited in the first embodiment of the present invention.
  • the plurality of protrusions 11 Evenly distributed in the bending area according to the array arrangement 2
  • it can also be arranged in a distributed arrangement, etc., and the invention is not limited thereto.
  • each protrusion 11 The shape is any one of spherical, square pillar, diamond pillar, trapezoid pillar, square pillar superposition, diamond pillar superposition, trapezoid pillar superposition, etc.
  • the plurality of protrusions 11 The shapes are the same, the protrusions 11 The shape is spherical.
  • the second embodiment of the flexible display panel of the present invention is different from the first embodiment described above in that the protrusion 11 In the bending zone 2
  • the density within is determined by the bending zone 2
  • the display area from the middle to the sides 1 And binding zone 3 Gradually decrease, that is, the bending zone 2 Bulge in the central area 11 Densely arranged, towards the bending zone 2 Bulge at both ends 11
  • the arrangement is getting looser, as shown in the figure 4
  • the other technical features are the same as the first embodiment described above, and will not be repeated here.
  • the third embodiment of the flexible display panel of the present invention is different from the first embodiment described above in that the protrusion 11
  • the shape is trapezoidal column.
  • the other technical features are the same as the first embodiment described above, and will not be repeated here.
  • the fourth embodiment of the flexible display panel of the present invention is different from the second embodiment described above in that the protrusion 11
  • the shape is trapezoidal column.
  • Other technical features are the same as those in the second embodiment described above, and will not be repeated here.
  • the fifth embodiment of the flexible display panel of the present invention is different from the third embodiment described above in that the protrusion 11
  • the shape is a superposition of two layers of trapezoidal columns, where the material of the upper trapezoidal column can be the same as or different from the material of the lower trapezoidal column, and the material of the upper trapezoidal column can be organic insulation such as acrylic resin, epoxy resin or polycarbonate resin This is not limited in the fifth embodiment of the present invention.
  • the other technical features are the same as the third embodiment described above, and will not be repeated here.
  • the sixth embodiment of the flexible display panel of the present invention is different from the first embodiment described above in that the protrusion 11
  • the shape is a square column.
  • the other technical features are the same as the first embodiment described above, and will not be repeated here.
  • the seventh embodiment of the flexible display panel of the present invention is different from the sixth embodiment described above in that the protrusion 11
  • the shape is a superposition of two layers of square pillars, where the material of the upper square pillar can be the same as or different from the material of the lower square pillar, and the material of the upper square pillar can be organic insulation such as acrylic resin, epoxy resin or polycarbonate resin
  • the seventh embodiment of the present invention does not limit this.
  • Other technical features are the same as those in the sixth embodiment described above, and will not be repeated here.
  • the eighth embodiment of the flexible display panel of the present invention is that the protrusion 11
  • the shape is a diamond-shaped column.
  • the other technical features are the same as the first embodiment described above, and will not be repeated here.
  • the ninth embodiment of the flexible display panel of the present invention is different from the first embodiment described above in that the organic insulating layer 10 Multiple bumps 11 Select different protrusion shapes, the multiple protrusions 11 Includes more than two different shapes, and each protrusion 11
  • the shape of is not limited to the above-mentioned categories of spherical, square column, rhombic column, trapezoidal column, superimposed body of square column, superimposed body of diamond column, superimposed body of trapezoidal column.
  • the other technical features are the same as the first embodiment described above, and will not be repeated here.
  • the flexible display panel of the present invention organic insulating layer 10 In the bending zone 2
  • organic insulating layer 10 In the bending zone 2
  • the inside is concave and convex, each metal wire on the upper layer twenty one All cover part of the bulge 11 So that its surface also follows the organic insulating layer 10
  • the convex twenty one when the flexible display panel is bent, the convex twenty one The part will release part of the stress, which can relieve the entire bending area 2
  • the stress and reduce the metal wire twenty one The occurrence of bending cracks achieves a narrow frame effect and prolongs the service life of the device.
  • the present invention also provides a method of manufacturing a flexible display panel, the flexible display panel is divided into a display area located in the middle 1 , Located in the display area 1 Outer binding zone 3 And located in the display area 1 And binding zone 3 Bending zone 2 ,
  • the production method includes the following steps:
  • step S1 Manufacture of organic insulating layer 10 ,
  • For the organic insulating layer 10 Perform patterning process in the bending area 2 Multiple protrusions 11 , And the organic insulating layer 10 Of the surface is in the bending zone 2 The inside is concave and convex.
  • step S2 In the organic insulating layer 10 Deposit and pattern on top to form a metal layer 20 ,
  • the metal layer 20 Including multiple strips running through the bending zone 2
  • Metal wire twenty one Each metal wire twenty one All cover part of the bulge 11 And its surface is accompanied by an organic insulating layer 10 Correspondingly concave and convex.
  • the steps S1 In the plurality of protrusions 11 are the same shape, or the organic insulating layer 10 Multiple bumps 11 Select different protrusion shapes, the multiple protrusions 11 Includes more than two different shapes.
  • the shape of is not limited to any one of spherical, square column, rhombic column, trapezoidal column, superimposed body of square column, superimposed body of rhombic column, and superimposed body of trapezoidal column.
  • the steps S2 In the patterning to form the metal layer 20 The specific process includes a photoresist coating step, an exposure step, a development step, an etching step, and a photoresist removal step, in which the metal layer is patterned to form 20
  • the etching step is performed by dry etching.
  • the protrusion 11 In the bending zone 2 The density within is determined by the bending zone 2 The display area from the middle to the sides 1 And binding zone 3 slowing shrieking.
  • the organic insulating layer 10 The material of the machine layer is organic insulation such as acrylic resin, epoxy resin or polycarbonate resin, which is not limited in the present invention.
  • the metal layer 20 Is a conductive material, which can be one or a combination of molybdenum, chromium, titanium, nickel, copper, silver, and magnesium, which is not limited in the present invention.
  • the metal layer 20 The structure is a single-layer structure or a stacked structure composed of two or more metals, which is not limited in the present invention.
  • the plurality of protrusions 11 Evenly distributed in the bending area according to the arrangement of the display 2
  • it can also be arranged in a distributed arrangement, etc., and the invention is not limited thereto.
  • the manufacturing method of the flexible display panel of the present invention Organic insulating layer 10 Multiple protrusions 11 , And the organic insulating layer 10 Of the surface is in the bending zone 2 The inside is concave and convex, and then in the organic insulating layer 10 Deposit and pattern on top to form a metal layer 20 , Metal layer 20 During the preparation process, the metal material will protrude along the lower layer 11 Deposited to cover part of the protrusion 11 Metal wire twenty one
  • the surface also has an organic insulating layer 10 Correspondingly concave and convex, when the flexible display panel is bent, the convex 11 The part will release part of the stress, so as to ease the entire bending zone 2 The stress and reduce the metal wire twenty one The occurrence of bending cracks achieves a narrow frame effect and prolongs the service life of the device.
  • the flexible display panel of the present invention includes an organic insulating layer and a metal layer provided on the organic insulating layer, and is divided into a display area located in the middle, a binding area located outside the display area, and In the bending area between the display area and the binding area, the organic insulating layer is provided with a plurality of protrusions in the bending area so that its surface is concave and convex in the bending area, and the metal layer It includes a plurality of metal wires running through the bending area, each metal wire covers a part of the protrusion of the organic insulating layer so that its surface is also concave and convex with the organic insulating layer, when the flexible display panel is in the bending process The raised part will release part of the stress, so as to alleviate the stress in the entire bending zone, reduce the occurrence of bending cracks of the metal wire, realize the narrow frame effect, and prolong the service life of the device.
  • the surface of the organic insulating layer is concave and convex in the bending area.
  • a metal layer is deposited and patterned on the organic insulating layer. During the preparation of the metal layer, the metal material will be deposited along the lower bumps, so that the surface of each metal wire that covers a part of the bumps also follows the organic insulating layer.
  • Concavo-convex and undulate when the flexible display panel is bent, the convex part will release part of the stress, thereby alleviating the stress in the entire bending area, reducing the occurrence of metal wire bending cracks, achieving the narrow frame effect and extending the service life .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
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Abstract

一种柔性显示面板及其制作方法。柔性显示面板包括有机绝缘层(10)及设于有机绝缘层(10)上的金属层(20)，并被划分出位于中部的显示区(1)、位于显示区(1)外侧的绑定区(3)及位于显示区(1)和绑定区(3)之间的弯折区(2)，有机绝缘层(10)在弯折区(2)内设有多个凸起(11)而使得其表面在弯折区(2)内呈凹凸起伏状，金属层(20)包括多条贯穿弯折区(2)的金属导线(21)，每条金属导线(21)均覆盖有机绝缘层(10)的一部分凸起(11)而使得其表面也随有机绝缘层(10)相应呈凹凸起伏状，当柔性显示面板在弯折过程中，凸起(11)会释放部分应力，以此缓解整个弯折区(2)的应力，减少金属导线(21)弯折裂纹的出现，实现窄边框效果，延长器件使用寿命。

Description

柔性显示面板及其制作方法 技术领域
本发明涉及显示技术领域，尤其涉及一种柔性显示面板及其制作方法。
 背景技术
柔性显示屏（Flexible Display）是一种可变型可弯曲的显示装置，弯折对显示屏的功能不会造成任何损失。与传统的刚性显示屏相比，柔性显示屏具有轻便、体积小、柔韧性好、低功耗等特点，可以被设计成各种性能特异的电子产品，如曲面电视、卷曲式电子手表、柔性手机等等。尽管目前在柔性技术方面已经取得了突破进展，但仍留有不少挑战。
显示装置的窄边框（Narrow border）甚至无边框是当下显示技术的主流发展趋势，对于柔性显示产品而言，由于柔性显示产品制作在可弯折的柔性载体上，在制作窄边框器件时，需要在器件的边缘进行弯折来实现绑定区域的窄边框设计，且弯折半径非常小。
当将绑定区域向显示面后侧进行弯曲时，绑定区域与显示区域之间即出现一段弯折区域。由于绑定区域与显示区域之间设置有多条用于传输信号的金属引出线，因此，各引线必然会穿过该弯折区域，随着弯曲程度的逐渐增大，金属导线在弯折区域内的部分受到垂直于弯折区域的竖直方向上的应力容易导致断裂，从而引发信号传输不良，影响柔性显示产品的正常显示。
例如，Apple公司在专利文件US9195108B2上公开的pad区结构示意图，其绑定区域相对显示面AA区向后弯折，多条金属导线处于弯折区域用于连接AA区和驱动电路，传输电信号，使AA区发光显示。
为了缩小显示屏到屏幕边界的距离，制备narrow border型显示屏，会将pad区进行180度的弯折，如LG公司在专利文件US9740035B2中公开的显示屏结构，此时弯折区的应力最大，而此处又分布了大量金属导线，而金属导线对机械力非常敏感，若上述弯折发生在导线排布的区域，高强度的拉伸会导致导线出现裂纹，影响器件使用寿命。
因此，急需寻找一种方法降低弯折区导线承受的应力，增加其柔韧性，延长器件使用寿命。
 技术问题
本发明的目的在于提供一种柔性显示面板，能够降低弯折区金属导线承受的应力，增加其柔韧性，延长器件的使用寿命。
本发明的目的还在于提供一种柔性显示面板的制作方法，能够降低弯折区金属导线承受的应力，增加其柔韧性，延长器件的使用寿命。
 技术解决方案
为实现上述目的，本发明提供一种柔性显示面板，被划分出位于中部的显示区、位于所述显示区外侧的绑定区及位于所述显示区和绑定区之间的弯折区；该柔性显示面板包括有机绝缘层及设于所述有机绝缘层上的金属层；
所述有机绝缘层在所述弯折区内设有多个凸起，而使得所述有机绝缘层的表面在所述弯折区内呈凹凸起伏状；
所述金属层包括多条贯穿所述弯折区的金属导线，每条金属导线均覆盖一部分凸起而其表面随有机绝缘层相应呈凹凸起伏状。
每个凸起的形状为球形、方形柱、菱形柱、梯形柱、方形柱的叠加体、菱形柱的叠加体及梯形柱的叠加体中的任意一种；
所述多个凸起的形状均相同，或者所述多个凸起包括两种以上不同的形状。
所述有机绝缘层机层材料为亚克力树脂、环氧树脂或聚碳酸酯类树脂。
所述金属层的材料为钼、铬、钛、镍、铜、银、镁中的一种或多种的组合；
所述金属层的结构为单层结构或两种以上金属所组成的叠层结构。
所述多个凸起均匀分布在所述弯折区内；或者，
所述凸起在弯折区内的密度由所述弯折区的中部向两侧的显示区和绑定区逐渐减小。
本发明还提供一种柔性显示面板的制作方法，所述柔性显示面板被划分出位于中部的显示区、位于所述显示区外侧的绑定区及位于所述显示区和绑定区之间的弯折区，该制作方法包括如下步骤：
步骤S1、制作有机绝缘层，对所述有机绝缘层进行图案化处理，在所述弯折区的有机绝缘层上形成多个凸起，而使得所述有机绝缘层的表面在所述弯折区内呈凹凸起伏状；
步骤S2、在所述有机绝缘层上沉积并图案化形成金属层，所述金属层包括多条贯穿所述弯折区的金属导线，每条金属导线均覆盖一部分凸起而其表面随有机绝缘层相应呈凹凸起伏状。
所述步骤S1中，每个凸起的形状为球形、方形柱、菱形柱、梯形柱、方形柱的叠加体、菱形柱的叠加体及梯形柱的叠加体中的任意一种；
所述多个凸起的形状均相同，或者所述多个凸起包括两种以上不同的形状。
所述步骤S1中，所述有机绝缘层机层材料为亚克力树脂、环氧树脂或聚碳酸酯类树脂。
所述步骤S2中，利用干蚀刻技术图案化形成所述金属层；
所述金属层的材料为钼、铬、钛、镍、铜、银、镁中的一种或多种的组合；
所述金属层的结构为单层结构或两种以上金属所组成的叠层结构。
所述步骤S1中，所述多个凸起均匀分布在所述弯折区内；或者，
所述凸起在弯折区内的密度由所述弯折区的中部向两侧的显示区和绑定区逐渐减小。
 有益效果
本发明的有益效果：本发明的柔性显示面板，包括有机绝缘层及设于所述有机绝缘层上的金属层，并被划分出位于中部的显示区、位于所述显示区外侧的绑定区及位于所述显示区和绑定区之间的弯折区，所述有机绝缘层在弯折区内设有多个凸起而使得其表面在弯折区内呈凹凸起伏状，所述金属层包括多条贯穿所述弯折区的金属导线，每条金属导线均覆盖有机绝缘层的一部分凸起而使得其表面也随有机绝缘层相应呈凹凸起伏状，当柔性显示面板在弯折过程中，凸起部位会释放部分应力，以此缓解整个弯折区的应力，减少金属导线弯折裂纹的出现，实现窄边框效果，延长器件使用寿命。本发明的柔性显示面板的制作方法，通过在弯折区的有机绝缘层上形成多个凸起，而使得所述有机绝缘层的表面在所述弯折区内呈凹凸起伏状，然后在该有机绝缘层上沉积并图案化形成金属层，金属层在制备过程中金属材料会沿着下层凸起进行沉积，从而使得均覆盖一部分凸起的每条金属导线的表面也随有机绝缘层相应呈凹凸起伏状，当柔性显示面板在弯折过程中，凸起部位会释放部分应力，以此缓解整个弯折区的应力，减少金属导线弯折裂纹的出现，实现窄边框效果，延长器件使用寿命。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
 附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其它有益效果显而易见。
附图中，
图1为本发明的柔性显示面板的俯视示意图；
图2为本发明的柔性显示面板第一实施例的弯折区中金属导线的俯视示意图；
图3为本发明的柔性显示面板第一实施例的弯折区的剖面示意图；
图4为本发明的柔性显示面板第二实施例的有机绝缘层的剖面示意图；
图5为本发明的柔性显示面板第三实施例的弯折区的剖面示意图；
图6为本发明的柔性显示面板第四实施例的有机绝缘层的剖面示意图；
图7为本发明的柔性显示面板第五实施例的弯折区的剖面示意图；
图8为本发明的柔性显示面板第六实施例的弯折区中金属导线的俯视示意图；
图9为本发明的柔性显示面板第六实施例的弯折区的剖面示意图；
图10为本发明的柔性显示面板第七实施例的弯折区的剖面示意图；
图11为本发明的柔性显示面板第八实施例的弯折区中金属导线的俯视示意图；
图12为本发明的柔性显示面板的制作方法的流程示意图。
 本发明的实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图 1-3 ，本发明柔性显示面板的第一实施例，被划分出位于中部的显示区 1 、位于所述显示区 1 外侧的绑定区 3 及位于所述显示区 1 和绑定区 3 之间的弯折区 2 ；该柔性显示面板包括有机绝缘层 10 及设于所述有机绝缘层 10 上的金属层 20 。
具体地，所述有机绝缘层 10 在所述弯折区 2 内设有多个凸起 11 ，而使得所述有机绝缘层 10 的表面在所述弯折区 2 内呈凹凸起伏状。
具体地，所述金属层 20 包括多条贯穿所述弯折区 2 的金属导线 21 ，每条金属导线 21 均覆盖一部分凸起 11 而其表面随所述有机绝缘层 10 相应呈凹凸起伏状。
当本发明第一实施例提供的上述柔性显示面板在弯折过程中，凸起 11 的部位会释放部分应力，以此可缓解整个弯折区 2 的应力，减少金属导线 21 弯折裂纹的出现，实现窄边框效果，延长器件使用寿命。
具体地，所述有机绝缘层 10 的材料为亚克力树脂、环氧树脂或聚碳酸酯类树脂等有机绝缘，本发明第一实施例对此不做限定。
具体地，所述金属层 20 的材料为导电材料，可以为钼（ Mo ）、铬（ Cr ）、钛（ Ti ）、镍（ Ni ）、铜（ Cu ）、银（ Ag ）、镁（ Mg ）中的一种或多种的组合，本发明第一实施例对此不做限定。
具体地，所述金属层 20 的结构可以为单层结构或两种以上金属所组成的叠层结构，本发明第一实施例对此不做限定。
具体地，所述多个凸起 11 按照阵列排列的方式均匀分布在所述弯折区 2 内，除此之外，也可以按照分散排列等方式进行排列，本发明对此不做限定。
具体地，每个凸起 11 的形状为球形、方形柱、菱形柱、梯形柱、方形柱的叠加体、菱形柱的叠加体、梯形柱的叠加体等形状中的任意一种；本实施例中，所述多个凸起 11 的形状均相同，所述凸起 11 的形状为球形。
请参阅图 4 ，本发明柔性显示面板的第二实施例，与上述第一实施例相比，其区别在于，所述凸起 11 在弯折区 2 内的密度由所述弯折区 2 的中部向两侧的显示区 1 和绑定区 3 逐渐减小，即所述弯折区 2 中部区域的凸起 11 排列密集，往弯折区 2 两端区域的凸起 11 排列越来越松散，具体如图 4 所示，相邻两凸起 11 间隔的距离依据柔性显示面板在弯折区 2 的弯折半径进行调整，为 d1<d2<d3< ……，其中， d1 、 d2 、 d3 分别为弯折区 2 由中部区域往两端区域方向的三对相邻两凸起 11 之间的距离。其他技术特征均与上述第一实施例相同，在此不再赘述。
请参阅图 5 ，本发明柔性显示面板的第三实施例，与上述第一实施例相比，其区别在于，所述凸起 11 的形状为梯形柱。其他技术特征均与上述第一实施例相同，在此不再赘述。
请参阅图 6 ，本发明柔性显示面板的第四实施例，与上述第二实施例相比，其区别在于，所述凸起 11 的形状为梯形柱。其他技术特征均与上述第二实施例相同，在此不再赘述。
请参阅图 7 ，本发明柔性显示面板的第五实施例，与上述第三实施例相比，其区别在于，所述凸起 11 的形状为两层梯形柱的叠加体，其中上层梯形柱的材料可以与下层梯形柱的材料相同或不同，上层梯形柱的材料可以为亚克力树脂、环氧树脂或聚碳酸酯类树脂等有机绝缘，本发明第五实施例对此不做限定。其他技术特征均与上述第三实施例相同，在此不再赘述。
请参阅图 8-9 ，本发明柔性显示面板的第六实施例，与上述第一实施例相比，其区别在于，所述凸起 11 的形状为方形柱。其他技术特征均与上述第一实施例相同，在此不再赘述。
请参阅图 10 ，本发明柔性显示面板的第七实施例，与上述第六实施例相比，其区别在于，所述凸起 11 的形状为两层方形柱的叠加体，其中上层方形柱的材料可以与下层方形柱的材料相同或不同，上层方形柱的材料可以为亚克力树脂、环氧树脂或聚碳酸酯类树脂等有机绝缘，本发明第七实施例对此不做限定。其他技术特征均与上述第六实施例相同，在此不再赘述。
请参阅图 11 ，本发明柔性显示面板的第八实施例，与上述第一实施例相比，其区别在于，所述凸起 11 的形状为菱形柱。其他技术特征均与上述第一实施例相同，在此不再赘述。
本发明柔性显示面板的第九实施例，与上述第一实施例相比，其区别在于，所述有机绝缘层 10 的多个凸起 11 选用不同的凸起形状，所述多个凸起 11 包括两种以上不同的形状，且每个凸起 11 的形状不限于上述类别的球形、方形柱、菱形柱、梯形柱、方形柱的叠加体、菱形柱的叠加体、梯形柱的叠加体。其他技术特征均与上述第一实施例相同，在此不再赘述。
本发明柔性显示面板，有机绝缘层 10 在弯折区 2 内设有多个凸起 11 而使得其表面在弯折区 2 内呈凹凸起伏状，上层的每条金属导线 21 均覆盖一部分凸起 11 而使得其表面也随有机绝缘层 10 相应呈凹凸起伏状，当柔性显示面板在弯折过程中，凸起 21 部位会释放部分应力，以此可缓解整个弯折区 2 的应力，减少金属导线 21 弯折裂纹的出现，实现窄边框效果，延长器件使用寿命。
请参阅图 12 ，基于上述的柔性显示面板，本发明还提供一种柔性显示面板的制作方法，所述柔性显示面板被划分出位于中部的显示区 1 、位于所述显示区 1 外侧的绑定区 3 及位于所述显示区 1 和绑定区 3 之间的弯折区 2 ，该制作方法包括如下步骤：
步骤 S1 、制作有机绝缘层 10 ，对所述有机绝缘层 10 进行图案化处理，在所述弯折区 2 内形成多个凸起 11 ，而使得所述有机绝缘层 10 的表面在所述弯折区 2 内呈凹凸起伏状。
步骤 S2 、在所述有机绝缘层 10 上沉积并图案化形成金属层 20 ，所述金属层 20 包括多条贯穿所述弯折区 2 的金属导线 21 ，每条金属导线 21 均覆盖一部分凸起 11 而其表面随有机绝缘层 10 相应呈凹凸起伏状。
具体地，所述步骤 S1 中，所述多个凸起 11 的形状均相同，或者所述有机绝缘层 10 的多个凸起 11 选用不同的凸起形状，所述多个凸起 11 包括两种以上不同的形状。
具体地，所述步骤 S1 中，每个凸起 11 的形状不限定于球形、方形柱、菱形柱、梯形柱、方形柱的叠加体、菱形柱的叠加体、梯形柱的叠加体中的任意一种。
具体地，所述步骤 S2 中，图案化形成所述金属层 20 的具体过程包括依次进行的光阻涂布步骤、曝光步骤、显影步骤、蚀刻步骤、去光阻步骤，其中，图案化形成所述金属层 20 的蚀刻步骤采用干法蚀刻进行。
具体地，所述步骤 S1 中，所述多个凸起 11 均匀分布在所述弯折区 2 内；或者，
所述凸起 11 在弯折区 2 内的密度由所述弯折区 2 的中部向两侧的显示区 1 和绑定区 3 逐渐减小。
具体地，所述有机绝缘层 10 机层的材料为亚克力树脂、环氧树脂或聚碳酸酯类树脂等有机绝缘，本发明对此不做限定。
具体地，所述金属层 20 的材料为导电材料，可以为钼、铬、钛、镍、铜、银、镁中的一种或多种的组合，本发明对此不做限定。
具体地，所述金属层 20 的结构为单层结构或两种以上金属所组成的叠层结构，本发明对此不做限定。
具体地，所述多个凸起 11 按照陈列排列的方式均匀分布在所述弯折区 2 内，除此之外，也可以按照分散排列等方式进行排列，本发明对此不做限定。
本发明柔性显示面板的制作方法，通过在弯折区 2 的有机绝缘层 10 上形成多个凸起 11 ，而使得所述有机绝缘层 10 的表面在所述弯折区 2 内呈凹凸起伏状，然后在该有机绝缘层 10 上沉积并图案化形成金属层 20 ，金属层 20 在制备过程中金属材料会沿着下层凸起 11 进行沉积，从而使得覆盖一部分凸起 11 的金属导线 21 的表面也随有机绝缘层 10 相应呈凹凸起伏状，当柔性显示面板在弯折过程中，凸起 11 部位会释放部分应力，以此缓解整个弯折区 2 的应力，减少金属导线 21 弯折裂纹的出现，实现窄边框效果，延长器件使用寿命。
综上所述，本发明的柔性显示面板，包括有机绝缘层及设于所述有机绝缘层上的金属层，并被划分出位于中部的显示区、位于所述显示区外侧的绑定区及位于所述显示区和绑定区之间的弯折区，所述有机绝缘层在弯折区内设有多个凸起而使得其表面在弯折区内呈凹凸起伏状，所述金属层包括多条贯穿所述弯折区的金属导线，每条金属导线均覆盖有机绝缘层的一部分凸起而使得其表面也随有机绝缘层相应呈凹凸起伏状，当柔性显示面板在弯折过程中，凸起部位会释放部分应力，以此缓解整个弯折区的应力，减少金属导线弯折裂纹的出现，实现窄边框效果，延长器件使用寿命。本发明的柔性显示面板的制作方法，通过在弯折区的有机绝缘层上形成多个凸起，而使得所述有机绝缘层的表面在所述弯折区内呈凹凸起伏状，然后在该有机绝缘层上沉积并图案化形成金属层，金属层在制备过程中金属材料会沿着下层凸起进行沉积，从而使得均覆盖一部分凸起的每条金属导线的表面也随有机绝缘层相应呈凹凸起伏状，当柔性显示面板在弯折过程中，凸起部位会释放部分应力，以此缓解整个弯折区的应力，减少金属导线弯折裂纹的出现，实现窄边框效果，延长器件使用寿命。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (10)

  1. 一种柔性显示面板，被划分出位于中部的显示区、位于所述显示区外侧的绑定区及位于所述显示区和绑定区之间的弯折区；该柔性显示面板包括有机绝缘层及设于所述有机绝缘层上的金属层；
    所述有机绝缘层在所述弯折区内设有多个凸起，而使得所述有机绝缘层的表面在所述弯折区内呈凹凸起伏状；
    所述金属层包括多条贯穿所述弯折区的金属导线，每条金属导线均覆盖一部分凸起而其表面随有机绝缘层相应呈凹凸起伏状。
  2. 如权利要求1所述的柔性显示面板，其中，每个凸起的形状为球形、方形柱、菱形柱、梯形柱、方形柱的叠加体、菱形柱的叠加体及梯形柱的叠加体中的任意一种；
    所述多个凸起的形状均相同，或者所述多个凸起包括两种以上不同的形状。
  3. 如权利要求1所述的柔性显示面板，其中，所述有机绝缘层机层材料为亚克力树脂、环氧树脂或聚碳酸酯类树脂。
  4. 如权利要求1所述的柔性显示面板，其中，所述金属层的材料为钼、铬、钛、镍、铜、银、镁中的一种或多种的组合；
    所述金属层的结构为单层结构或两种以上金属所组成的叠层结构。
  5. 如权利要求1所述的柔性显示面板，其中，所述多个凸起均匀分布在所述弯折区内；或者，
    所述凸起在弯折区内的密度由所述弯折区的中部向两侧的显示区和绑定区逐渐减小。
  6. 一种柔性显示面板的制作方法，其中，所述柔性显示面板被划分出位于中部的显示区、位于所述显示区外侧的绑定区及位于所述显示区和绑定区之间的弯折区，该制作方法包括如下步骤：
    步骤S1、制作有机绝缘层，对所述有机绝缘层进行图案化处理，在所述弯折区的有机绝缘层上形成多个凸起，而使得所述有机绝缘层的表面在所述弯折区内呈凹凸起伏状；
    步骤S2、在所述有机绝缘层上沉积并图案化形成金属层，所述金属层包括多条贯穿所述弯折区的金属导线，每条金属导线均覆盖一部分凸起而其表面随有机绝缘层相应呈凹凸起伏状。
  7. 如权利要求6所述的柔性显示面板的制作方法，其中，所述步骤S1中，每个凸起的形状为球形、方形柱、菱形柱、梯形柱、方形柱的叠加体、菱形柱的叠加体及梯形柱的叠加体中的任意一种；
    所述多个凸起的形状均相同，或者所述多个凸起包括两种以上不同的形状。
  8. 如权利要求6所述的柔性显示面板的制作方法，其中，所述步骤S1中，所述有机绝缘层机层材料为亚克力树脂、环氧树脂或聚碳酸酯类树脂。
  9. 如权利要求6所述的柔性显示面板的制作方法，其中，所述步骤S2中，利用干蚀刻技术图案化形成所述金属层；
    所述金属层的材料为钼、铬、钛、镍、铜、银、镁中的一种或多种的组合；
    所述金属层的结构为单层结构或两种以上金属所组成的叠层结构。
  10. 如权利要求6所述的柔性显示面板的制作方法，其中，所述步骤S1中，所述多个凸起均匀分布在所述弯折区内；或者，
    所述凸起在弯折区内的密度由所述弯折区的中部向两侧的显示区和绑定区逐渐减小。
PCT/CN2018/120420 2018-12-03 2018-12-11 柔性显示面板及其制作方法 WO2020113625A1 (zh)

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