WO2021169620A1 - 显示面板及其制造方法、显示装置 - Google Patents

显示面板及其制造方法、显示装置 Download PDF

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Publication number
WO2021169620A1
WO2021169620A1 PCT/CN2021/070595 CN2021070595W WO2021169620A1 WO 2021169620 A1 WO2021169620 A1 WO 2021169620A1 CN 2021070595 W CN2021070595 W CN 2021070595W WO 2021169620 A1 WO2021169620 A1 WO 2021169620A1
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WIPO (PCT)
Prior art keywords
area
display panel
bending
hollow structure
display
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PCT/CN2021/070595
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English (en)
French (fr)
Inventor
王志强
张兵
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 成都京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US17/430,686 priority Critical patent/US11960333B2/en
Publication of WO2021169620A1 publication Critical patent/WO2021169620A1/zh

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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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1675—Miscellaneous details related to the relative movement between the different enclosures or enclosure parts
    • G06F1/1683—Miscellaneous details related to the relative movement between the different enclosures or enclosure parts for the transmission of signal or power between the different housings, e.g. details of wired or wireless communication, passage of cabling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1641—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being formed by a plurality of foldable display components
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1615—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function
    • G06F1/1616—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a display panel, a manufacturing method thereof, and a display device.
  • a display panel includes a display area and a frame area located at the periphery of the display area, the display area is provided with at least one first bending area extending in a first direction, and the frame area is provided with a frame area extending in a second direction
  • the second bending area is set, the first direction intersects the second direction, and at least one intersection of the extension line of the at least one first bending area and the extension line of the second bending area is formed
  • the display panel is configured as a hollow structure penetrating the display surface and the non-display surface of the display panel at least in the at least one overlapping area.
  • the hollow structure includes a groove structure recessed from the first edge of the display panel in the direction of the overlapping area, the frame area includes a lower frame area, and the second bending area is disposed on the lower frame.
  • the first edge is an edge of the lower frame area that extends along the second direction.
  • the hollow structure includes an opening structure penetrating the display surface and the non-display surface of the display panel.
  • the frame area includes: a fan-out area connected to the display area, and at least two bonding circuit areas connected to a side of the fan-out area away from the display area, wherein the second curve
  • the folding area is arranged in the fan-out area
  • the fan-out area includes at least two fan-out sub-areas corresponding to the at least two binding circuit areas
  • the hollow structure is arranged at every two adjacent binding circuit areas. Between circuit areas.
  • the at least two bonding circuit regions are bent to the non-display surface of the display panel through the second bending area.
  • the first curvature radius of the bending structure formed after the display panel is bent along the first bending area is R1
  • the frame area is formed by bending along the second bending area.
  • the second radius of curvature of the folded structure is R2
  • the half of the side length of the orthographic projection shape of the opening structure in the direction perpendicular to the base substrate or the radius of the circumscribed circle is greater than max(R1, R2).
  • the display panel includes a base substrate, and the base substrate has a cutting protection area around the hollow structure, and no wiring is provided at the cutting protection area.
  • the fan-out area is provided with wiring, and the area between the wiring and the hollow structure forms the cutting protection area.
  • edges of the hollow structure include straight edges
  • the minimum distance between the traces set in the fan-out sub-regions closest to the linear edge and the linear edge ranges from ⁇ 170 ⁇ m;
  • the edge of the hollow structure includes an arc-shaped edge, and the minimum distance between the arc-shaped edge and the traces set in the fan-out sub-region closest to the arc-shaped edge has a value range of ⁇ 250 ⁇ m ;
  • the edge of the hollow structure includes a corner-shaped edge, and the minimum distance between any point on the corner-shaped edge and the trace set in the fan-out sub-region closest to the corner-shaped edge has a value range of ⁇ 300 ⁇ m.
  • the hollow structure includes an upper edge located on a side close to the display area, and the second bending area includes an upper border located on a side close to the display area; wherein the hollow structure The upper edge is located between the bending center line of the second bending area and the upper boundary of the second bending area.
  • the second bending area has a first width a in the first direction
  • the upper edge of the hollow structure and the upper boundary of the second bending area have a second width h1 in the first direction;
  • the second width h1 and the first width a satisfy the following relationship: 0 ⁇ h1 ⁇ a/3.
  • the display panel has a plurality of the first bending regions, and a plurality of crossing positions of the extension lines of the plurality of first bending regions and the extension lines of the second bending regions are formed correspondingly.
  • each of the bending and overlapping areas is provided with the hollow structure.
  • the display panel further includes a back protection film disposed on the side of the non-display surface, and the back protection film is provided with a hollow pattern corresponding to the hollow structure at a position corresponding to the hollow structure .
  • a display device includes the display panel as described above.
  • a hollow structure is formed at at least one overlapping area formed by at least one intersection of the extension line of the at least one first bending area and the extension line of the second bending area.
  • the forming a hollow structure at at least one overlapping area formed by at least one intersection of the extension line of the first bending area and the extension line of the second bending area includes :
  • a laser cutting method is used to form the hollow structure.
  • FIG. 1 shows a schematic diagram of the structure of a flexible foldable display panel in the related art
  • FIG. 2 shows a front view of the structure of an embodiment of the display panel provided by the present disclosure
  • Fig. 3 shows a cross-sectional view of the structure in the direction D-D in Fig. 2;
  • FIG. 4 shows a structural front view of another embodiment of the display panel provided by the present disclosure.
  • FIG. 5 shows a structural front view of another embodiment of the display panel provided by the present disclosure.
  • FIG. 6 shows a front view of the structure of another embodiment of the display panel provided by the present disclosure.
  • FIG. 7 shows a front view of the structure of another embodiment of the display panel provided by the present disclosure.
  • the flexible foldable display panel is divided into a display area AA and a display area.
  • the display area AA has a bendable area to realize the foldable display of the display screen.
  • the frame area includes: Fanout area (fan-out area) A2, binding circuit area A3, and frame bending area A4.
  • Fanout area A2 is located at the lower end of display area AA; binding circuit area A3 is located at the lower end of Fanout area A2.
  • a bendable area (Pad Bending area) is also set on the lower frame.
  • the fanout area (fan-out area) and the binding circuit area are located on the side of the non-display surface, so as to achieve the purpose of reducing the lower frame of the flexible display screen.
  • the frame bending area A4 namely the Pad bending area, is mainly set in In the Fanout area A2 between the bonding circuit area A3 and the display area AA.
  • the bendable area of the display screen intersects with the extension line of the Fanout area (for example, perpendicular)
  • the bendable area of the display area of the flexible foldable display screen and the bendable area of the lower frame area will overlap with each other.
  • a bending overlap area is generated.
  • the bending overlap area is folded twice during the folding display, thereby greatly increasing the bending stress of the bending overlap area in practical applications, increasing the risk of wire breakage, and reducing Improve the reliability and reliability of the flexible foldable display.
  • the flexible foldable display panel has a bendable area A5 in the display area, and the extension line of the bendable area A5 is folded inward/outward along the Y direction and the left and right sides of the center of the screen.
  • the frame bending area is used to bend toward the non-display surface side of the flexible display screen so that the binding circuit area is located on the non-display surface side to achieve the purpose of reducing the lower frame of the flexible display screen, that is, the binding circuit area A3 is bent to The back of the screen to get a narrower bottom bezel.
  • the embodiments of the present disclosure provide a display panel and a display device, which can reduce the bending stress of the overlapping area of the foldable display panel, and improve the product reliability and reliability of the display panel.
  • the display panel provided by the embodiment of the present disclosure includes a display area AA and a frame area located at the periphery of the display area AA, and the display area AA is provided with at least one first bend extending in a first direction Y Area A5, the frame area is provided with a second bending area A4 extending along a second direction X, the first direction Y intersects the second direction X, and the at least one first bending area A5 At least one intersection of the extension line and the extension line of the second bending area A4 forms at least one overlapping area.
  • the hollow structure 100 of the display surface is provided with at least one first bend extending in a first direction Y Area A5
  • the frame area is provided with a second bending area A4 extending along a second direction X
  • the first direction Y intersects the second direction X
  • the at least one first bending area A5 At least one intersection of the extension line and the extension line of the second bending area A4 forms at least one overlapping area.
  • At least one overlapping area formed by at least one intersection of the extension line of the first bending area A5 of the display area AA and the second bending area A4 of the frame area of the display panel is designed as a hollow structure 100, thereby Two or more folds in the overlapping area are avoided, and the bending stress of the overlapping area is reduced, thereby improving the reliability and reliability of the display panel.
  • the display panel provided by the embodiment of the present disclosure will be described in more detail below.
  • the hollow structure 100 includes a groove structure recessed from the first edge of the display panel in the direction of the overlapping area, wherein the frame area includes a bottom The frame area, the second bending area is disposed in the lower frame area, and the first edge is an edge of the lower frame area extending along the second direction.
  • a groove structure is formed at the intersection of the extension line of the first bending area A5 of the display area AA and the second bending area A4 of the frame area of the display panel, and the groove structure is used as the hollow structure 100 , which can be formed by laser cutting.
  • the orthographic projection shape of the groove structure in the direction perpendicular to the base substrate may be trapezoidal, triangular, rectangular, ⁇ -shaped, semicircular, and the like.
  • the orthographic projection shape of the groove structure in the direction perpendicular to the base substrate is a trapezoid.
  • the concave The design of the groove structure as a trapezoid can make the bending stress of the overlapping area smaller.
  • the hollow structure 100 includes an opening structure penetrating the display surface and the non-display surface of the display panel.
  • the hollow structure 100 may also be formed by an opening method.
  • the specific shape of the opening structure is not limited, and the opening structure is perpendicular to the
  • the shape of the orthographic projection in the direction of the base substrate can be a circle, a square, a trapezoid, a triangle, a rectangle, etc., and any special-shaped structure that changes the above-mentioned shape boundary into an arc shape.
  • the first curvature radius of the bending structure formed after the display panel is bent along the first bending area A5 is R1
  • the frame area is along the second bending area A4.
  • the second radius of curvature of the bent structure formed after bending is R2, and half of the side length of the orthographic projection shape of the opening structure in the direction perpendicular to the base substrate or the radius of the circumscribed circle should be greater than max(R1, R2).
  • the orthographic projection shape of the opening structure in the direction perpendicular to the substrate is circular
  • its circumscribed circle is itself, and the radius of the opening structure should be greater than max(R1, R2).
  • the shape of the orthographic projection of the opening structure in the direction perpendicular to the base substrate is a square
  • half of its side length should be greater than max(R1, R2).
  • the orthographic projection shape of the opening structure in the direction perpendicular to the base substrate is triangle, square, trapezoid, etc.
  • the circumscribed circle radius should be greater than max(R1, R2).
  • the side length or circumscribed radius of the orthographic projection shape of the opening structure in the direction perpendicular to the base substrate should not be set too large, and the following cutting protection area should be ensured to be large enough to reduce Fragments and thermal effects of laser cutting adversely affect metal traces.
  • the frame area includes a lower frame area A1, wherein the second bending area A4 is located in the lower frame area A1, and the lower frame area A1 includes : A fanout area A2 connected to the display area AA and at least two bonding circuit areas A3 connected to a side of the Fanout area A2 away from the display area AA, wherein the second bend The area A4 is disposed in the Fanout area A2, the fan-out area includes at least two fan-out sub-areas corresponding to the at least two binding circuit areas A3, and the hollow structure 100 is located in two adjacent binding circuit areas A3. Between circuit area A3.
  • the at least two bonding circuit regions are bent to the non-display surface of the display panel through the second bending area.
  • the at least two bonding circuit areas can be independently bent to the non-display surface of the display panel, thereby improving each bonding The bending effect of the circuit area.
  • the routing of the Fanout area A2 avoids being arranged around the hollow structure 100 to avoid adverse effects on the routing when the hollow structure 100 is formed by laser cutting, for example.
  • the display panel 10 includes a base substrate having a cutting protection area around the hollow structure 100, and the cutting protection area is No routing is set.
  • a cutting protection area can be provided in the Fanout area of the frame area near the edge of the groove or opening structure to reduce the adverse effects of laser cutting debris and thermal influence on the metal wiring and improve the product yield.
  • the Fanout area A2 is provided with wires, and the area between the wires and the hollow structure 100 forms the cutting protection area.
  • the following provides an optional range of values for the spacing between the traces and the grooves to avoid laser cutting damage to metal traces and avoid the heat-affected zone of laser cutting:
  • the minimum distance between the linear edge and the trace set in the fan-out sub-region closest to the linear edge ranges from ⁇ 170 ⁇ m;
  • the minimum distance between the arc-shaped edge and the trace set in the fan-out sub-region closest to the arc-shaped edge ranges from ⁇ 250 ⁇ m;
  • the minimum distance between the vertex of the corner-shaped edge and the trace set in the fan-out sub-region closest to the vertex is in the range of ⁇ 300 ⁇ m.
  • the orthographic projection shape of the hollow structure 100 in the direction perpendicular to the base substrate is a trapezoid as shown in FIG.
  • the minimum distance between any point on the arc edge and the trace set in the fan-out subregion closest to the point may be in the range of ⁇ 250 ⁇ m.
  • the corner-shaped edge is a structure formed by the intersection of two edges of a hollow structure.
  • the orthographic projection shape of the hollow structure 100 in the direction perpendicular to the base substrate is a trapezoid as shown in FIG. 2, and the structure formed by the intersection of the edge T1 and the edge T3 of the trapezoid is a corner edge.
  • the minimum distance between the vertex on the corner-shaped edge and the trace set in the fan-out subregion closest to the vertex may be in the range of ⁇ 300 ⁇ m.
  • the distance between the wiring and the hollow structure 100 can be reasonably designed according to actual applications.
  • the above is only an exemplary embodiment provided, which is not limited. .
  • the hollow structure 100 includes an upper edge located on a side close to the display area AA, and the second bending area A4 includes an upper edge located close to the display area AA.
  • FIG. 3 shows an example of the cross-sectional laminate structure of the Fanout area.
  • the Fanout area A2 is composed of a metal layer (metal traces, etc.) and an organic protective layer 101 from bottom to top.
  • the inorganic layer 102, the PI layer 103, wherein the inorganic layer 102 above the PI layer 103 in the second bending area A4 is removed by exposure and etching to form a trench structure, and then PI is filled in the trench structure
  • Other organic matter forms the second bending area A4 (as shown in FIGS. 2 and 3) to relieve and reduce the local stress of the second bending area A4 during bending.
  • the laser cutting line c1 of the groove structure in the X direction of the two adjacent bonding circuit areas of the lower frame area A1 should be in the area H1 above the center line c2 of the second bending area A4 (PI filling area) Inside.
  • the second bending area A4 has a first width a in the first direction Y; the upper edge of the hollow structure 100 and the upper boundary of the second bending area A4 are The first direction Y has a second width h1; wherein, the second width h1 and the first width a satisfy the following relationship: 0 ⁇ h1 ⁇ a/3.
  • the display panel has a plurality of the first bending areas A5, the extension lines of the plurality of first bending areas A5 and the extension lines of the second bending area A4 A plurality of intersections respectively form a plurality of the overlapping regions, wherein each of the bending and overlapping regions is provided with the hollow structure 100.
  • a groove structure can be cut between every two adjacent bonding circuit areas A3
  • the perforated structure can prevent the overlapping area of the display panel from being repeatedly folded twice or more times, and improve the reliability and reliability of the display panel.
  • the display panel further includes a back protective film disposed on the side of the non-display surface, and the back protective film is provided with a position corresponding to the hollow structure 100.
  • the hollow pattern corresponding to the hollow structure 100 is, for example, a protective film groove structure.
  • the orthographic projection of the protective film groove structure on the flexible display screen all fall within the range of the orthographic projection of the protective film on the flexible display screen.
  • the back protective film provided on the non-display surface of the display panel should have a corresponding hollow pattern at a position corresponding to the hollow structure 100, and the size of the hollow pattern of the back protective film is slightly smaller than or equal to the hollow pattern.
  • the size of the hollow structure 100 of the display panel is to avoid multiple folding of the rear protective film in the front projection area of the overlapping area of the display panel.
  • an embodiment of the present disclosure also provides a method for manufacturing a display panel, which is used to manufacture the display panel provided by the embodiment of the present disclosure, and the method includes:
  • Step S1 forming at least one first bending area and a second bending area on the display panel
  • Step S2 forming a hollow structure at at least one overlapping area formed by at least one intersection of the extension line of the at least one first bending area and the extension line of the second bending area.
  • At least one overlapping area formed by at least one intersection of an extension line of the at least one first bending area and an extension line of the second bending area , Forming a hollow structure, including:
  • a laser cutting method is used to form the hollow structure.
  • the hollow structure can also be formed in other ways, and is not limited to laser cutting.
  • an embodiment of the present disclosure also provides a display device, including the display panel provided by the embodiment of the present disclosure.

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

一种显示面板及其制造方法、显示装置，显示面板包括显示区(AA)及边框区，显示区(AA)设有至少一个沿第一方向(Y)延伸的第一弯折区域(A5)，边框区设有沿第二方向(X)延伸设置的第二弯折区域(A4)，第一方向(Y)与第二方向(X)相交，至少一个第一弯折区域(A5)的延伸线和第二弯折区域(A4)的延伸线的至少一个交叉位置形成至少一个重叠区域，显示面板至少在至少一个重叠区域被配置为贯通显示面板的显示面和非显示面的镂空结构(100)。

Description

显示面板及其制造方法、显示装置
相关申请的交叉引用
本申请主张在2020年2月24日在中国提交的中国专利申请号No.202010111984.6的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及显示技术领域，尤其涉及一种显示面板及其制造方法、显示装置。
背景技术
随着显示技术的不断进步，用户对显示屏幕的显示效果需求越来越高，全面屏、窄边框、可折叠等技术成为柔性显示面板的发展趋势。目前，显示屏边框折叠(Pad Bending)是实现具有极窄下边框的显示产品的最优方案。
发明内容
一种显示面板，包括显示区及位于所述显示区外围的边框区，所述显示区设有至少一个沿第一方向延伸的第一弯折区域，所述边框区设有沿第二方向延伸设置的第二弯折区域，所述第一方向与所述第二方向相交，所述至少一个第一弯折区域的延伸线和所述第二弯折区域的延伸线的至少一个交叉位置形成至少一个重叠区域，所述显示面板至少在所述至少一个重叠区域被配置为贯通所述显示面板的显示面和非显示面的镂空结构。
进一步的，所述镂空结构包括自所述显示面板的第一边缘向所述重叠区域方向凹陷的凹槽结构，所述边框区包括下边框区，所述第二弯折区域设置在所述下边框区，所述第一边缘为所述下边框区的、沿所述第二方向延伸的边缘。
进一步的，所述镂空结构包括贯通所述显示面板的显示面和非显示面的开孔结构。
进一步的，所述边框区包括：与显示区连接的扇出区、及连接于所述扇 出区的远离所述显示区的一侧的至少两个绑定电路区，其中所述第二弯折区域设置在所述扇出区，所述扇出区包括分别与所述至少两个绑定电路区对应的至少两个扇出子区域，所述镂空结构设置在每相邻两个绑定电路区之间。
进一步的，所述至少两个绑定电路区通过所述第二弯折区域弯折至所述显示面板的非显示面。
进一步的，所述显示面板在沿所述第一弯折区域弯折后形成的弯折结构的第一曲率半径为R1，所述边框区沿所述第二弯折区域弯折后形成的弯折结构的第二曲率半径为R2，所述开孔结构在垂直于所述衬底基板方向上的正投影形状的边长的一半或外接圆的半径大于max(R1，R2)。
进一步的，所述显示面板包括衬底基板，所述衬底基板在所述镂空结构周围具有切割保护区域，该切割保护区域处不设置走线。
进一步的，所述扇出区布设有走线，且所述走线与所述镂空结构之间的区域形成所述切割保护区域。
进一步的，所述镂空结构的边缘包括直线状边缘，
所述直线状边缘与所述直线状边缘最近的扇出子区域中设置的走线之间的最小间距取值范围≥170μm；
和/或，所述镂空结构的边缘包括弧线状边缘，所述弧线状边缘与所述弧线状边缘最近的扇出子区域中设置的走线之间的最小间距取值范围≥250μm；
和/或，所述镂空结构的边缘包括拐角状边缘，所述拐角状边缘上的任一点与所述拐角状边缘最近的扇出子区域中设置的走线之间的最小间距取值范围≥300μm。
进一步的，所述镂空结构包括位于靠近所述显示区的一侧的上边缘，所述第二弯折区域包括位于靠近所述显示区的一侧的上边界；其中所述镂空结构的所述上边缘位于所述第二弯折区域的弯折中心线与所述第二弯折区域的所述上边界之间。
进一步的，所述第二弯折区域在所述第一方向上具有第一宽度a；
所述镂空结构的所述上边缘与所述第二弯折区域的所述上边界在所述第一方向上具有第二宽度h1；
其中，所述第二宽度h1与所述第一宽度a之间满足以下关系：0＜h1≤a/3。
进一步的，所述显示面板具有多个所述第一弯折区域，多个所述第一弯折区域的延伸线与所述第二弯折区域的延伸线的多个交叉位置对应形成多个所述重叠区域，每一所述弯折重叠区处均设有所述镂空结构。
进一步的，所述显示面板还包括设置在所述非显示面一侧的背面保护膜，所述背面保护膜在与所述镂空结构对应的位置、设有与所述镂空结构所对应的镂空图案。
一种显示装置，包括如上所述的显示面板。
一种显示面板的制造方法，用于制造如上所述的显示面板，所述方法包括：
形成所述显示面板上的至少一个第一弯折区域和第二弯折区域；
在所述至少一个第一弯折区域的延伸线和所述第二弯折区域的延伸线的至少一个交叉位置所形成的至少一个重叠区域处，形成镂空结构。
示例性的，所述在至少一个所述第一弯折区域的延伸线和所述第二弯折区域的延伸线的至少一个交叉位置所形成的至少一个重叠区域处，形成镂空结构，具体包括：
采用激光切割方式，形成所述镂空结构。
附图说明
图1表示相关技术中柔性可折叠显示面板的结构示意图；
图2表示本公开提供的显示面板的一种实施例的结构主视图；
图3表示图2中D-D向结构剖视图；
图4表示本公开提供的显示面板的另一种实施例的结构主视图；
图5表示本公开提供的显示面板的另一种实施例的结构主视图；
图6表示本公开提供的显示面板的另一种实施例的结构主视图；
图7表示本公开提供的显示面板的另一种实施例的结构主视图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”、“一”或者“该”等类似词语也不表示数量限制，而是表示存在至少一个。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
在对本公开实施例提供的显示面板及显示装置进行详细说明之前，有必要对相关技术进行以下说明：如图1所示，在相关技术中，柔性可折叠显示面板分为显示区AA和显示区AA外围的边框区，显示区AA具有可弯折区域，用以实现显示屏的可折叠显示。同时，边框区包括：Fanout区(扇出区)A2、绑定电路区A3和边框弯折区A4，其中，Fanout区A2位于显示区AA下端；绑定电路区A3位于Fanout区A2下端，用于设置驱动IC芯片和绑定电路。
为了获得更窄的下边框，在下边框也会设置可弯折区域(即Pad Bending区域)，下边框区沿弯折区域向柔性可折叠显示屏的非显示面侧弯折，以使下边框的Fanout区(扇出区)和绑定电路区位于非显示面侧，达到减小柔性显示屏下边框的目的。
对于中大尺寸、高分辨的柔性显示面板(如笔记本电脑、平板电脑、车载显示屏等)，一般有至少2个绑定电路区A3；边框弯折区A4，即Pad bending区域，主要设置于绑定电路区A3和显示区AA之间的Fanout区A2内。
但是，当显示屏可弯折区域与Fanout区的延伸线相交(例如垂直)时，柔性可折叠显示屏的显示区的可弯折区域与下边框区的可弯折区域会存在重叠区域，由此而产生弯折重叠区，该弯折重叠区在折叠显示时出现两次折叠，从而极大增加该弯折重叠区在实际应用中的弯折应力，增大了走线的断裂风险，降低了柔性可折叠显示屏的可靠性和信赖性。
如图1所示，柔性可折叠显示面板在显示区具有可弯折区域A5，该可弯折区域A5的延伸线沿着Y方向、屏幕中心左右两侧地向内/外折叠。边框弯折区用于向柔性显示屏的非显示面侧弯折，以使绑定电路区位于非显示面侧，达到减小柔性显示屏下边框的目的，即将绑定电路区A3弯折到屏幕背面，以获得更窄的下边框。可弯折区域A5和边框弯折区A4的延伸线相交处存在重叠区域(如图1虚线圆形处)，由此产生了弯折重叠区A6，弯折重叠区A6在折叠显示时出现2次折叠，这会极大增加弯折重叠区A6在实际应用时的弯折应力，增大边框弯折区A4内部走线的断裂风险，降低所述柔性可折叠显示屏的可靠性和信赖性。
针对上述技术问题，本公开实施例中提供了一种显示面板及显示装置，能够降低可折叠显示面板的重叠区域的弯折应力，提升显示面板的产品可靠性和信赖性。
如图2所示，本公开实施例提供的显示面板包括显示区AA及位于所述显示区AA外围的边框区，所述显示区AA设有至少一个沿第一方向Y延伸的第一弯折区域A5，所述边框区设有沿第二方向X延伸设置的第二弯折区域A4，所述第一方向Y与所述第二方向X相交，所述至少一个第一弯折区域A5的延伸线和所述第二弯折区域A4的延伸线的至少一个交叉位置形成至少一个重叠区域，所述显示面板至少在所述至少一个重叠区域被配置为贯通所述显示面板的显示面和非显示面的镂空结构100。
上述方案中，将显示面板的显示区AA的第一弯折区域A5和边框区的第二弯折区域A4的延伸线的至少一个交叉位置所形成的至少一个重叠区域设计为镂空结构100，从而避免了该重叠区域出现二次或多次折叠，减小该重叠区域的弯折应力，从而改善显示面板的可靠性和信赖性。
以下对本公开实施例提供的显示面板进行更为详细的说明。
在一种示例性的实施例中，如图2所示，所述镂空结构100包括自所述显示面板的第一边缘向所述重叠区域方向凹陷的凹槽结构，其中所述边框区包括下边框区，所述第二弯折区域设置在所述下边框区，所述第一边缘为所述下边框区的、沿所述第二方向延伸的边缘。
采用上述方案，在显示面板的显示区AA的第一弯折区域A5和边框区的第二弯折区域A4的延伸线交叉位置处切割形成凹槽结构，该凹槽结构作为所述镂空结构100，其可以是采用激光切割形成。所述凹槽结构在垂直于所述衬底基板方向上的正投影形状可为梯形、三角形、矩形、∩形、半圆形等。如图1所示，示例性的，所述凹槽结构在垂直于所述衬底基板方向上的正投影形状为梯形，考虑显示面板在实际应用中折叠时的弯折应力，将所述凹槽结构设计为梯形能够使得该重叠区域的弯折应力更小。
在另一种示例性的实施例中，如图6和图7所示，所述镂空结构100包括贯通所述显示面板的显示面和非显示面的开孔结构。也就是说，所述镂空结构100还可以是采用开孔方式来形成，其中如图6和图7所示，所述开孔结构的具体形状不限定，所述开孔结构在垂直于所述衬底基板方向上的正投影形状可以是圆形，也可为正方形、梯形、三角形、矩形等，以及将上述形状边界变化为弧形的任意异型结构。
此外，需要说明的是，所述显示面板在沿所述第一弯折区域A5弯折后形成的弯折结构的第一曲率半径为R1，所述边框区沿所述第二弯折区域A4弯折后形成的弯折结构的第二曲率半径为R2，所述开孔结构在垂直于所述衬底基板方向上的正投影形状的边长的一半或外接圆半径应大于max(R1，R2)。
例如，所述开孔结构在垂直于所述衬底基板方向上的正投影形状为圆形时，其外接圆即为其本身，该开孔结构的半径应大于max(R1，R2)。所述开孔结构在垂直于所述衬底基板方向上的正投影形状为正方形时，其边长的一半应大于max(R1，R2)。所述开孔结构在垂直于所述衬底基板方向上的正投影形状为三角形、正方形、梯形等时，其外接圆半径应大于max(R1，R2)。
在一些实施例中，所述开孔结构在垂直于所述衬底基板方向上的正投影形状的边长或外接圆半径不宜设置太大，还应保证下述切割保护区域足够大，以减少激光切割的碎片和热影响对金属走线造成不利影响。
在一种示例性的实施例中，如图2所示，所述边框区包括下边框区A1，其中所述第二弯折区域A4位于所述下边框区A1，所述下边框区A1包括：与显示区AA连接的扇出(Fanout)区A2、及连接于所述Fanout区A2的远离所述显示区AA的一侧的至少两个绑定电路区A3，其中所述第二弯折区域A4设置在所述Fanout区A2，所述扇出区包括分别与所述至少两个绑定电路区A3对应的至少两个扇出子区域，所述镂空结构100位于相邻两个绑定电路区A3之间。
其中，所述至少两个绑定电路区通过所述第二弯折区域弯折至所述显示面板的非显示面。
通过在相邻两个绑定电路区A3之间设置所述镂空结构100，可以独立地将所述至少两个绑定电路区分别弯折至所述显示面板的非显示面，提高各绑定电路区域的弯折效果。
另外，所述Fanout区A2的走线避让绕开所述镂空结构100设置，以避免例如通过激光切割形成所述镂空结构100时对所述走线造成不利影响。
此外，在本实施例中，示例性的，如图2所示，所述显示面板10包括衬底基板，所述衬底基板在所述镂空结构100周围具有切割保护区域，该切割保护区域处不设置走线。
采用上述方案，可在边框区的Fanout区靠近凹槽或开孔结构的边缘侧，设置一个切割保护区，以减少激光切割的碎片和热影响对金属走线造成不利影响，提升产品良率。
此外，所述Fanout区A2布设有走线，且所述走线与所述镂空结构100之间的区域形成所述切割保护区域。采用上述方案，在布线时，使得走线与所述凹槽或所述开孔结构的切割线之间具有一定的间距，以进一步地保证所述走线不被切割损伤，以及避免走线弯折断裂。
针对所述镂空结构100的不同形状，以下提供可选的走线与凹槽之间的间距取值范围，以避免激光切割损伤金属走线和避开激光切割的热影响区：
所述镂空结构100的边缘包括直线状边缘时，所述直线状边缘与距离所述直线状边缘最近的扇出子区域中设置的走线之间的最小间距取值范围≥170μm；
所述镂空结构100的边缘包括弧线状边缘时，所述弧线状边缘与距离所述弧线状边缘最近的扇出子区域中设置的走线之间的最小间距取值范围≥250μm；
所述镂空结构100的边缘包括拐角状边缘时，所述拐角状边缘的顶点与距离所述顶点最近的扇出子区域中设置的走线之间的最小间距取值范围≥300μm。
例如，所述镂空结构100在垂直于所述衬底基板方向上的正投影形状为如图2所示的梯形，梯形的边缘T1与距离T1最近的扇出子区域中设置的走线之间的最小间距取值范围≥170μm。
在所述镂空结构100的边缘包括弧线状边缘时，可以是弧线边缘上任一点与距离该点最近的扇出子区域中设置的走线之间的最小间距取值范围≥250μm。
在一些实施例中，所述拐角状边缘为镂空结构的两个边缘相交所构成的结构。例如，所述镂空结构100在垂直于所述衬底基板方向上的正投影形状为如图2所示的梯形，梯形的边缘T1与边缘T3相交所形成的结构为拐角状边缘。
在所述镂空结构100的边缘包括拐角状边缘时，可以是所述拐角状边缘上顶点与距离该顶点最近的扇出子区域中设置的走线之间的最小间距取值范围≥300μm。
需要说明的是，所述走线与所述镂空结构100之间的间距大小，可根据实际应用中来进行合理设计，以上仅是提供的一种示例性的实施例，对此并不进行限定。
此外，在本实施例中，示例性的，如图2所示，所述镂空结构100包括位于靠近所述显示区AA的一侧的上边缘，所述第二弯折区域A4包括位于靠近所述显示区AA的一侧的上边界；其中所述镂空结构100的所述上边缘位于所述第二弯折区域A4的弯折中心线与所述第二弯折区域A4的所述上边界之间。
采用上述方案，图3所示为所述Fanout区的剖面叠层结构示例图，如图所示，所述Fanout区A2由底部至顶部依次为金属层(金属走线等)和有机 保护层101、无机层102、PI层103，其中，通过曝光刻蚀去除掉所述第二弯折区域A4的PI层103上方的无机层102，以形成挖槽结构，再在该挖槽结构内填充PI等有机物形成所述第二弯折区域A4(如图2和图3所示)，用以缓解和减小所述第二弯折区域A4在弯折时的局部应力。所述凹槽结构在所述下边框区A1的相邻两个绑定电路区的X方向的激光切割线c1应在所述第二弯折区域A4(PI填充区)中心线c2上方区域H1内。
具体的，所述第二弯折区域A4在所述第一方向Y上具有第一宽度a；所述镂空结构100的所述上边缘与所述第二弯折区域A4的所述上边界在所述第一方向Y上具有第二宽度h1；其中，所述第二宽度h1与所述第一宽度a之间满足以下关系：0＜h1≤a/3。
此外，在一些实施例中，所述显示面板具有多个所述第一弯折区域A5，多个所述第一弯折区域A5的延伸线与所述第二弯折区域A4的延伸线的多个交叉位置对应(respectively)形成多个所述重叠区域，其中，每一所述弯折重叠区处均设有所述镂空结构100。
采用上述方案，对于更大尺寸或更高分辨率窄下边框的可折叠显示面板，若仅显示面板中心线相邻两个绑定电路区A3之间的位置具有第一弯折区域A5，则仅在显示面板中心线相邻两个绑定电路区A3之间切割形成凹槽结构或开孔结构，其他相邻的两个绑定电路区A3之间可不设置镂空结构，如图5所示；或者，若每相邻两个绑定电路区A3之间均设有第一弯折区域A5，则每相邻两个绑定电路区A3之间均切割形成凹槽结构或所述开孔结构，如图4所示。其中，对于需要1次以上弯折的显示面板，例如Z形柔性可折叠显示面板(如图4所示)，可在每相邻两个相邻绑定电路区A3之间切割形成凹槽结构或开孔结构，可避免显示面板的重叠区域出现2次以及更多次数的重复折叠，提升显示面板的可靠性和信赖性。
此外，在一种示例性的实施例中，所述显示面板还包括设置在所述非显示面一侧的背面保护膜，所述背面保护膜在与所述镂空结构100对应的位置、设有与所述镂空结构100所对应的镂空图案，如保护膜凹槽结构。可选地，所述保护膜凹槽结构在柔性显示屏上的正投影全部落在保护膜在柔性显示屏上正投影的范围内。
采用上述方案，所述显示面板的非显示面所设置的背面保护膜在与所述镂空结构100对应位置应开设相应的镂空图案，且所述背面保护膜的镂空图案的尺寸略小于或等于所述显示面板的镂空结构100尺寸，以避免所述背面保护膜在显示面板的所述重叠区域的正投影区域出现多次折叠。
此外，本公开实施例还提供了一种显示面板的制造方法，用于制造本公开实施例所提供的显示面板，所述方法包括：
步骤S1、形成所述显示面板上的至少一个第一弯折区域和第二弯折区域；
步骤S2、在所述至少一个第一弯折区域的延伸线和所述第二弯折区域的延伸线的至少一个交叉位置所形成的至少一个重叠区域处，形成镂空结构。
示例性的，在所述显示面板上，所述在所述至少一个第一弯折区域的延伸线和所述第二弯折区域的延伸线的至少一个交叉位置所形成的至少一个重叠区域处，形成镂空结构，具体包括：
采用激光切割方式，形成所述镂空结构。
当然可以理解的是，在实际应用中，也可以通过其他方式来形成所述镂空结构，并不仅限定于激光切割方式。
此外，本公开实施例还提供了一种显示装置，包括本公开实施例提供的显示面板。
有以下几点需要说明：
(1)本公开实施例附图只涉及到与本公开实施例涉及到的结构，其他结构可参考通常设计。
(2)为了清晰起见，在用于描述本公开的实施例的附图中，层或区域的厚度被放大或缩小，即这些附图并非按照实际的比例绘制。可以理解，当诸如层、膜、区域或基板之类的元件被称作位于另一元件“上”或“下”时，该元件可以“直接”位于另一元件“上”或“下”或者可以存在中间元件。
(3)在不冲突的情况下，本公开的实施例及实施例中的特征可以相互组合以得到新的实施例。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，本公开的保护范围应以权利要求的保护范围为准。

Claims (16)

  1. 一种显示面板，包括显示区及位于所述显示区外围的边框区，所述显示区设有至少一个沿第一方向延伸的第一弯折区域，所述边框区设有沿第二方向延伸设置的第二弯折区域，所述第一方向与所述第二方向相交，所述至少一个第一弯折区域的延伸线和所述第二弯折区域的延伸线的至少一个交叉位置形成至少一个重叠区域，所述显示面板至少在所述至少一个重叠区域被配置为贯通所述显示面板的显示面和非显示面的镂空结构。
  2. 根据权利要求1所述的显示面板，其中，
    所述镂空结构包括自所述显示面板的第一边缘向所述重叠区域方向凹陷的凹槽结构，所述边框区包括下边框区，所述第二弯折区域设置在所述下边框区，所述第一边缘为所述下边框区的、沿所述第二方向延伸的边缘。
  3. 根据权利要求1所述的显示面板，其中，
    所述镂空结构包括贯通所述显示面板的显示面和非显示面的开孔结构。
  4. 根据权利要求2所述的显示面板，其中，
    所述边框区包括：与显示区连接的扇出区、及连接于所述扇出区的远离所述显示区的一侧的至少两个绑定电路区，
    其中，所述第二弯折区域设置在所述扇出区，所述扇出区包括分别与所述至少两个绑定电路区对应的至少两个扇出子区域，所述镂空结构设置在每相邻两个绑定电路区之间。
  5. 根据权利要求4所述的显示面板，其中，所述至少两个绑定电路区通过所述第二弯折区域弯折至所述显示面板的非显示面。
  6. 根据权利要求3所述的显示面板，其中，所述显示面板在沿所述第一弯折区域弯折后形成的弯折结构的第一曲率半径为R1，所述边框区沿所述第二弯折区域弯折后形成的弯折结构的第二曲率半径为R2，所述开孔结构在垂直于所述衬底基板方向上的正投影形状的边长的一半或外接圆的半径大于max(R1，R2)。
  7. 根据权利要求2或6所述的显示面板，其中，
    所述显示面板包括衬底基板，所述衬底基板在所述镂空结构周围具有切 割保护区域，该切割保护区域处不设置走线。
  8. 根据权利要求7所述的显示面板，其中，
    所述扇出区布设有走线，且所述走线与所述镂空结构之间的区域形成所述切割保护区域。
  9. 根据权利要求8所述的显示面板，其中，
    所述镂空结构的边缘包括直线状边缘，所述直线状边缘与所述直线状边缘最近的扇出子区域中设置的走线之间的最小间距取值范围≥170μm；
    和/或，所述镂空结构的边缘包括弧线状边缘，所述弧线状边缘与所述弧线状边缘最近的扇出子区域中设置的走线之间的最小间距取值范围≥250μm；
    和/或，所述镂空结构的边缘包括拐角状边缘，所述拐角状边缘上的顶点与所述顶点最近的扇出子区域中设置的走线之间的最小间距取值范围≥300μm。
  10. 根据权利要求1所述的显示面板，其中，
    所述镂空结构包括位于靠近所述显示区的一侧的上边缘，所述第二弯折区域包括位于靠近所述显示区的一侧的上边界；其中所述镂空结构的所述上边缘位于所述第二弯折区域的弯折中心线与所述第二弯折区域的所述上边界之间。
  11. 根据权利要求10所述的显示面板，其中，
    所述第二弯折区域在所述第一方向上具有第一宽度a；
    所述镂空结构的所述上边缘与所述第二弯折区域的所述上边界在所述第一方向上具有第二宽度h1；
    其中，所述第二宽度h1与所述第一宽度a之间满足以下关系：0＜h1≤a/3。
  12. 根据权利要求1所述的显示面板，其中，
    所述显示面板具有多个所述第一弯折区域，多个所述第一弯折区域的延伸线与所述第二弯折区域的延伸线的多个交叉位置对应形成多个所述重叠区域，每一所述弯折重叠区处均设有所述镂空结构。
  13. 根据权利要求1所述的显示面板，其中，
    所述显示面板还包括设置在所述非显示面一侧的背面保护膜，所述背面保护膜在与所述镂空结构对应的位置、设有与所述镂空结构所对应的镂空图案。
  14. 一种显示装置，包括如权利要求1至13任一项所述的显示面板。
  15. 一种显示面板的制造方法，用于制造如权利要求1至13任一项所述的显示面板，所述方法包括：
    形成所述显示面板上的至少一个第一弯折区域和第二弯折区域；
    在所述至少一个第一弯折区域的延伸线和所述第二弯折区域的延伸线的至少一个交叉位置所形成的至少一个重叠区域处，形成镂空结构。
  16. 根据权利要求15所述的方法，其中，所述在所述至少一个第一弯折区域的延伸线和所述第二弯折区域的延伸线的至少一个交叉位置所形成的至少一个重叠区域处，形成镂空结构，包括：
    采用激光切割方式，形成所述镂空结构。
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