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WO2020029371A1 - 一种触摸屏及oled显示面板 - Google Patents

一种触摸屏及oled显示面板 Download PDF

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Publication number
WO2020029371A1
WO2020029371A1 PCT/CN2018/105636 CN2018105636W WO2020029371A1 WO 2020029371 A1 WO2020029371 A1 WO 2020029371A1 CN 2018105636 W CN2018105636 W CN 2018105636W WO 2020029371 A1 WO2020029371 A1 WO 2020029371A1
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WIPO (PCT)
Prior art keywords
metal
touch
electrode
touch electrode
grid
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Application number
PCT/CN2018/105636
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English (en)
French (fr)
Inventor
李波
Original Assignee
武汉华星光电半导体显示技术有限公司
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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 US16/232,969 priority Critical patent/US10698548B2/en
Publication of WO2020029371A1 publication Critical patent/WO2020029371A1/zh

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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412Digitisers structurally integrated in a display
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40OLEDs integrated with touch screens
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices

Definitions

  • the invention relates to the field of display, in particular to a touch screen and an OLED display panel.
  • the touch technologies that cooperate with AMOLED display mainly include the external touch film (Film) bonding scheme and the glass-encapsulated rigid On-Cell technology (referring to the touch screen embedded between the color filter substrate and the polarizer of the display screen) ), Whether it is external film bonding or glass On-Cell touch technology, there is a problem that increasing the thickness of the product affects the design of the narrow side.
  • FIG. 1 a schematic structural diagram of an existing OLED display panel using an external touch film bonding scheme is shown, which includes, from bottom to top, a substrate 1 ′, an OLED layer 2 ′, and an encapsulation layer 3 in this order. ', The first transparent optical adhesive layer 4', the touch film layer 5 ', the polarizer 6', the second transparent optical adhesive layer 7 ', and the cover glass layer 8'. Among them, the touch film and the OLED layer are bonded by transparent optical glue, and the polarizer and the cover glass need to be bonded by transparent optical glue. Since the number of bonding is twice, the bonding tolerance is generally 0.1 mm. Above, so the external touch film bonding solution will increase the thickness of the product and is not conducive to the design of narrow bezel products.
  • FIG. 2 a schematic structural diagram of an existing OLED display panel using glass-encapsulated On-Cell touch technology is shown.
  • it includes: substrate 10 ', OLED layer 20', packaging glass layer 30 ', touch circuit layer 40', polarizer 50 ', transparent optical adhesive layer 60', and cover glass layer 70 in order from bottom to top. '.
  • the technical problem to be solved by the present invention is to provide a touch screen and an OLED display panel, which can realize a flexible touch screen and reduce the thickness of the OLED display panel.
  • an aspect of an embodiment of the present invention provides a touch screen, which includes:
  • a plurality of first touch electrode strings arranged in a first direction, each of the first touch electrode strings including a plurality of first grid electrodes electrically connected;
  • a plurality of second touch electrode strings arranged in a second direction and crossing the plurality of first touch electrode strings and located on the same layer, each of the second touch electrode strings including a plurality of second grid electrodes;
  • An insulating layer disposed on one side of the first touch electrode string and the second touch electrode string;
  • a bridge metal layer including at least one metal bridge
  • one side of the insulating layer is in contact with the first touch electrode string and the second touch electrode string, the other side of the insulating layer is in contact with the bridge metal layer, and an adjacent one in the second touch electrode string is
  • the two second grid electrodes communicate with the metal bridge through a through hole provided on the insulation layer.
  • the first grid electrode includes a plurality of first metal lines
  • the second grid electrode includes a plurality of second metal lines.
  • Adjacent edges of the first grid electrode and its adjacent second grid electrode are staggered, and a first disconnection is performed between the first metal line and the adjacent second metal line to realize the first touch electrode Electrical separation between the string and the second touch electrode string.
  • the metal bridge is a metal grid bridge formed by a plurality of third metal lines, and the metal grid bridge is linear, X-shaped, or double X-shaped as a whole.
  • connection portions are electrically connected to two adjacent second grid electrodes through through holes provided in the insulation layer, respectively.
  • the connection portion is thicker than the adjacent third metal line.
  • the sides where the first touch electrode string and the second touch electrode string are alternately arranged have a pulsed edge or a zigzag edge.
  • the first touch electrode string and the second touch electrode string are made of a titanium-aluminum-titanium three-layer composite metal, and the metal bridge is made of a titanium-aluminum-titanium or a molybdenum-aluminum-molybdenum three-layer composite metal.
  • the first grid electrode is one of a driving electrode and a sensing electrode
  • the second grid electrode is the other of a driving electrode and a sensing electrode.
  • the first metal line, the second metal line, and the third metal line are all routed along the middle of adjacent pixels, and their widths are all within the range of 0.5 to 5 ⁇ m.
  • the diameter of the through hole does not exceed the distance between adjacent pixel points.
  • an OLED display panel which includes: a base substrate, an OLED layer provided on the base substrate, and a packaging layer provided above the OLED layer; further comprising:
  • a touch screen provided on the packaging layer
  • a protective layer disposed on the touch screen
  • the touch screen includes:
  • a plurality of first touch electrode strings arranged in a first direction, each of the first touch electrode strings including a plurality of first grid electrodes electrically connected;
  • a plurality of second touch electrode strings arranged in a second direction and crossing the plurality of first touch electrode strings and located on the same layer, each of the second touch electrode strings including a plurality of second grid electrodes;
  • An insulating layer disposed on one side of the first touch electrode string and the second touch electrode string;
  • a bridge metal layer including at least one metal bridge
  • one side of the insulating layer is in contact with the first touch electrode string and the second touch electrode string, the other side of the insulating layer is in contact with the bridge metal layer, and an adjacent one in the second touch electrode string is
  • the two second grid electrodes communicate with the metal bridge through a through hole provided on the insulation layer.
  • the first grid electrode includes a plurality of first metal lines
  • the second grid electrode includes a plurality of second metal lines.
  • Adjacent edges of the first grid electrode and its adjacent second grid electrode are staggered, and a first disconnection is performed between the first metal line and the adjacent second metal line to realize the first touch electrode. Electrical separation between the string and the second touch electrode string.
  • the metal bridge is a metal grid bridge formed by a plurality of third metal lines, and the metal grid bridge is linear, X-shaped, or double X-shaped as a whole.
  • connection portions are electrically connected to two adjacent second grid electrodes through through holes provided in the insulation layer, respectively.
  • the connection portion is thicker than the adjacent third metal line.
  • the sides where the first touch electrode string and the second touch electrode string are alternately arranged have a pulsed edge or a zigzag edge.
  • the first touch electrode string and the second touch electrode string are made of a titanium-aluminum-titanium three-layer composite metal, and the metal bridge is made of a titanium-aluminum-titanium or a molybdenum-aluminum-molybdenum three-layer composite metal.
  • the first grid electrode is one of a driving electrode and a sensing electrode
  • the second grid electrode is the other of a driving electrode and a sensing electrode.
  • the first metal line, the second metal line, and the third metal line are all routed along the middle of adjacent pixels, and their widths are all within the range of 0.5 to 5 ⁇ m.
  • the diameter of the through hole does not exceed the distance between adjacent pixel points.
  • the touch screen and OLED display panel provided by the present invention can realize an On-Cell touch scheme for flexible display touch by making a metal grid touch sensing circuit on a thin film encapsulation layer of a flexible OLED display screen;
  • the metal grid is used as the touch sensing circuit, the product has good resistance to bending, and the metal grid line is routed between adjacent pixels, which can minimize the optical impact of the touch sensor on the OLED;
  • FIG. 1 is a schematic structural diagram of an OLED display panel using an external touch film bonding scheme in the prior art
  • FIG. 2 is a schematic structural diagram of an OLED display panel using glass-encapsulated On-Cell touch technology in the prior art
  • FIG. 3 is a schematic structural diagram of an embodiment of a touch screen provided by the present invention.
  • FIG. 4 is a more detailed structural diagram of an embodiment where the first touch electrode string and the second touch electrode string cross in FIG. 3;
  • FIG. 5 is a more detailed structure diagram of the adjacent region of the first touch electrode string and the second touch electrode string in FIG. 4.
  • FIG. 6 is a more detailed structural diagram of another embodiment where the first touch electrode string and the second touch electrode string cross in FIG. 3;
  • FIG. 7 is a schematic structural diagram of an embodiment of the third metal line in FIG. 3;
  • FIG. 8 is a schematic structural diagram of another embodiment of the third metal line in FIG. 3;
  • FIG. 9 is a schematic structural diagram of still another embodiment of the third metal line in FIG. 3;
  • FIG. 10 is a schematic structural diagram of an embodiment of an OLED display panel provided by the present invention.
  • the touch screen 1 includes:
  • the formed first grid electrode 111 includes a plurality of first grid electrodes 111 in each touch electrode string 11, and adjacent first grid electrodes are electrically connected through a first metal line 110.
  • the metal line 110 runs along the middle of the adjacent pixel points 7, that is, the pixel points 7 are located in the grid, so that the grid lines do not block the light-emitting area of the pixel points 7;
  • each of the second touch electrode strings 12 includes A second grid electrode 121 formed by crossing a plurality of second metal lines 120, and the second metal lines 120 are routed along the middle of adjacent pixels; in FIG. 3, for the convenience of viewing, the viewing angle is that of the metal grid touch screen. Looking down, the metal bridge 13 is located on the uppermost level; similar viewing angles in FIGS. 4 to 6 later; and
  • An insulating layer 14 disposed on one side of the first touch electrode string 11 and the second touch electrode string 12;
  • a bridge metal layer including at least one metal bridge 13;
  • one side of the insulating layer 14 is in contact with the first touch electrode string 11 and the second touch electrode string 12, and the other side of the insulating layer 14 is in contact with the bridge metal layer and the second touch electrode string 12 is in contact.
  • Two adjacent second grid electrodes 121 in the communication with the metal bridge 13 are realized through through holes provided on the insulation layer, that is, two adjacent second grid electrodes 121 pass through the metal bridge. 13 Make electrical connections.
  • Adjacent sides of the first grid electrode 111 and its adjacent second grid electrode 121 are staggered, and the first metal line 110 and the adjacent second metal line 120 are separated by a slight disconnection 16 to The electrical separation between the first touch electrode string 11 and the second touch electrode string 12 is achieved.
  • the distance of the minute disconnection 16 is in the range of 3-20 ⁇ m.
  • the two ends of the metal bridge 13 are respectively electrically connected to two adjacent second grid electrodes 121 through through holes provided in the insulating layer 14.
  • the diameter of the through hole does not exceed the distance between adjacent pixels.
  • the diameter of the through hole is less than 15 ⁇ .
  • each first touch electrode string 11 and each second touch electrode string 12 are connected with a trace 17 extending to the binding area 18 of the touch screen; it can be understood that the first touch shown in FIG. 3
  • the number of the electrode strings 11 and the second touch electrode strings 12 is merely an example, and is not a limitation.
  • the sides where each of the first touch electrode string 11 and the second touch electrode string 12 are staggered with each other have pulsed edges; it can be understood that in other embodiments, other different In a staggered manner, for example, in another embodiment shown in FIG. 6, the sides where the first touch electrode string 11 and the second touch electrode string 12 are staggered with each other have jagged edges, which can increase the first mesh.
  • the contact area between the grid electrode 111 and the second grid electrode 121 enhances the mutual capacitance signal.
  • the shape difference of the grids in the first touch electrode string 11 and the second touch electrode string 12 shown in FIG. 4 is only for easy differentiation, but not limitation. In actual products, the first touch electrode string 11 and the second touch The electrode string 12 may adopt the same grid shape. For details, refer to the example in FIG. 5.
  • the metal bridge 13 may be a metal grid bridge formed by at least one third metal line 130, and may also have different shapes. As shown in FIG. 7 to FIG. 9, three types of metal grid bridges are shown. Among them, the metal grid bridge shown in FIG. 7 is a whole formed by a plurality of (eg, three) third metal wires 130.
  • a linear (bar-shaped) metal grid bridge in which the black dots 131 are connection portions for electrically connecting with the second touch electrode string 12 through vias, and in order to improve the connection effect, the connection portions at both ends of the metal bridge 13 It is thicker than the adjacent third metal line 130; it can be understood that using multiple third metal lines 130 can effectively reduce the impedance of the metal grid bridge; in other embodiments, metal bridges of other shapes can also be used 13. As shown in FIGS. 8 and 9, the X-shaped and double X-shaped metal mesh bridges formed by a plurality of third metal lines 130 are shown respectively.
  • the use of smaller X-shaped metal mesh bridges can reduce The area of the small bridge area prevents the risk of optical interference caused by too large a bridge area; while the double X-shaped metal grid bridge is used to reduce the impedance while maintaining a small metal grid bridge, thereby reducing the occurrence of conduction. Chances of bad communication.
  • the third metal line 130 is routed along the middle of adjacent pixel points 7.
  • the first grid electrode 111 is one of a driving electrode and a sensing electrode
  • the second grid electrode 121 is another of a driving electrode and a sensing electrode.
  • the driving electrode is used to input a driving signal
  • the sensing electrode is used to receive a detection signal.
  • the mutual capacitance change at the intersection of two conductive lines or the self-capacitance change of each conductive line is detected, that is, self-capacitance or mutual capacitance is adopted. Way to get the location of the touch point. If a coordinate system is established with the first direction X and the second direction Y, the obtained touch point position can be represented by the coordinate system.
  • the first direction X and the second direction Y are generally defined as perpendicular to each other. This makes capacitance detection easier and coordinate positioning easier.
  • the first direction X and the second direction Y may also be set to cross non-vertically.
  • the first touch electrode string 11 and the second touch electrode string 12 are made of a titanium-aluminum-titanium three-layer composite metal
  • the metal bridge 13 is made of a titanium-aluminum-titanium or molybdenum-aluminum-molybdenum three-layer composite metal.
  • the widths of the first metal line 110, the second metal line 120, and the third metal line 130 are within a range of 0.5 to 5 ⁇ m.
  • the OLED display panel includes:
  • a base substrate 2 an OLED layer 3 provided on the base substrate 2, and an encapsulation layer 4 provided above the OLED layer 3;
  • the aforementioned touch screen 1 provided on the packaging layer 4;
  • a protective layer 5 is disposed on the touch screen 1.
  • the metal grid touch screen 1 includes:
  • An insulating layer 14 is provided on the first metal layer; through-holes 15 are formed on both ends of the first insulating layer at the metal bridge 13;
  • a second metal layer is deposited on the insulating layer 14 and the encapsulation layer 4 and is etched to form a pattern to form the aforementioned plurality of first touch electrode strings 11 and second touch electrode strings 12 crossing each other, wherein the second touch Adjacent second grid electrodes 121 in the electrode string 12 are electrically connected to the metal bridge 13 through the through holes 15.
  • a metal grid touch sensing circuit on the encapsulation layer of the flexible OLED display, and making the metal grid circuit avoid the light emitting area of the pixel, it is in the middle of the adjacent pixel. At least one of the area wiring, the driving electrode or the sensing electrode is connected and conducted through a metal grid bridge (bridge metal) below, so that a flexible touch screen can be realized, and the thickness of the touch screen can be reduced by reducing the use of transparent optical glue.
  • bridge metal bridge metal
  • the metal grid touch screen and the OLED display panel provided by the present invention can realize a flexible display touch On-Cell touch scheme by making a metal grid touch sensing circuit on a thin film encapsulation layer of a flexible OLED display screen;
  • the metal grid is used as the touch sensing circuit, the product has good resistance to bending, and the metal grid line is routed between adjacent pixels, which can minimize the optical impact of the touch sensor on the OLED;

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  • General Engineering & Computer Science (AREA)
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Abstract

一种触摸屏以及相应的OLED面板,通过在柔性OLED显示屏的封装层(4)上制作金属网格触控线路,并使金属网格触控线路避开像素点(7)的发光区,在相邻像素点(7)的中间区域走线,且驱动电极或感应电极至少其中一种电极通过下方的金属桥(13)连接导通,从而可以实现柔性触摸屏,并通过减少透明光学胶的使用,使其厚度变薄膜,降低生产成本。

Description

一种触摸屏及OLED显示面板
本申请要求于2018年8月6日提交中国专利局、申请号为201810883765.2、发明名称为“一种触摸屏及OLED显示面板”的中国专利申请的优先权,上述专利的全部内容通过引用结合在本申请中。
技术领域
本发明涉及显示领域,特别涉及一种触摸屏及OLED显示面板。
背景技术
近年来,主动矩阵有机发光二极体显示屏(AMOLED)显示技术的快速发展,推动曲面和柔性显示触控产品迅速进入市场,各大面板厂商纷纷投资布局柔性显示触控项目。目前配合AMOLED显示屏的触控技术主要有外挂式触控薄膜(Film)贴合方案和玻璃封装的刚性On-Cell技术(指将触摸屏嵌入到显示屏的彩色滤光片基板和偏光片之间),无论是外挂薄膜贴合还是玻璃On-Cell触控技术,都存在增加产品厚度影响窄边设计的问题。
如图1所示,示出了现有的一种采用外挂式触控薄膜贴合方案的OLED显示面板的结构示意图,其从下至上依次包括:基板1’、OLED层2’、封装层3’、第一透明光学胶层4’、触控薄膜层5’、偏光片6’、第二透明光学胶层7’以及盖板玻璃层8’。其中,通过透明光学胶将触控薄膜和OLED层进行贴合,同时需要将偏光片与盖板玻璃通过透明光学胶进行贴合,由于贴合次数为两次,贴合公差一般都在0.1mm以上,所以外挂式触控薄膜贴合方案会增大产品厚度而且不利于窄边框产品设计。
如图2所示,示出了现有的一种采用玻璃封装On-Cell触控技术的OLED显示面板的结构示意图。在图中,其从下至上依次包括:基板10’、OLED层20’、封装玻璃层30’、触控线路层40’、偏光片50’、透明光学胶层60’以及盖板玻璃层70’。其是在显示屏的封装玻璃上制作触控感应线路,然后将封装玻璃的一面通过透明光学胶与OLED面板贴合到一起,不需要再单独 贴合外挂式触控薄膜,但是这种结构只适合制作刚性的AMOLED显示屏,而且产品整体厚度较厚,不适合当前产品轻薄化及柔性化的发展方向。
发明内容
本发明所要解决的技术问题在于,提供一种触摸屏及OLED显示面板,可以实现柔性触摸屏,并能减少OLED显示面板的厚度。
为了解决上述技术问题,本发明的实施例的一方面提供一种触摸屏,其包括:
在第一方向上排列的多个第一触摸电极串,每一所述第一触摸电极串包括多个电连接的第一网格电极;
在第二方向上排列的与所述多个第一触摸电极串交叉的位于同层的多个第二触摸电极串,每一所述第二触摸电极串包括多个第二网格电极;
绝缘层,其设置于所述第一触摸电极串以及第二触摸电极串的一侧;
桥金属层,包括至少一个金属桥;
其中,所述绝缘层的一侧与所述第一触摸电极串以及第二触摸电极串相接触,绝缘层的另一侧与桥金属层相接触,所述第二触摸电极串中的相邻两个第二网格电极通过设置于所述绝缘层上的通孔与所述金属桥实现连通。
其中,所述第一网格电极包括多条第一金属线,所述第二网格电极包括多条第二金属线;
所述第一网格电极与其相邻的第二网格电极的相邻的边为交错设置,其第一金属线与相邻的第二金属线之间通过微小断开以实现第一触摸电极串和第二触摸电极串之间的电学分离。
其中,所述金属桥为由多条第三金属线形成的金属网格桥,所述金属网格桥整体呈线性、X型或双X型。
其中,所述金属桥两端设置有连接部,所述连接部通过设置于所述绝缘层上的通孔分别与相邻的两个第二网格电极实现电连接,所述金属桥两端的连接部较相邻第三金属线更粗。
其中,所述第一触摸电极串与第二触摸电极串相互交错设置的边具有脉冲式边缘或锯齿形边缘。
其中,所述第一触摸电极串以及第二触摸电极串采用钛铝钛三层复合金属,所述金属桥采用钛铝钛或者钼铝钼三层复合金属。
其中,所述第一网格电极为驱动电极和感应电极中的一种,所述第二网格电极为驱动电极和感应电极中的另一种。
其中,所述第一金属线、第二金属线以及第三金属线均沿相邻像素点中间走线,且其宽度均处于0.5~5μm范围以内。
其中,所述通孔的直径不超过相邻像素点的距离。
相应地,本发明的另一方面还提供一种OLED显示面板,其包括:衬底基板、设于衬底基板上的OLED层以及设于所述OLED层上方的封装层;进一步包括:
设置于所述封装层上的触摸屏;
设置于所述触摸屏上的保护层;
其中,所述触摸屏包括:
在第一方向上排列的多个第一触摸电极串,每一所述第一触摸电极串包括多个电连接的第一网格电极;
在第二方向上排列的与所述多个第一触摸电极串交叉的位于同层的多个第二触摸电极串,每一所述第二触摸电极串包括多个第二网格电极;
绝缘层,其设置于所述第一触摸电极串以及第二触摸电极串的一侧;
桥金属层,包括至少一个金属桥;
其中,所述绝缘层的一侧与所述第一触摸电极串以及第二触摸电极串相接触,绝缘层的另一侧与桥金属层相接触,所述第二触摸电极串中的相邻两个第二网格电极通过设置于所述绝缘层上的通孔与所述金属桥实现连通。
其中,所述第一网格电极包括多条第一金属线,所述第二网格电极包括多条第二金属线;
所述第一网格电极与其相邻的第二网格电极的相邻的边为交错设置,其第一金属线与相邻的第二金属线之间通过微小断开以实现第一触摸电极串和第二触摸电极串之间的电学分离。
其中,所述金属桥为由多条第三金属线形成的金属网格桥,所述金属网格桥整体呈线性、X型或双X型。
其中,所述金属桥两端设置有连接部,所述连接部通过设置于所述绝缘层上的通孔分别与相邻的两个第二网格电极实现电连接,所述金属桥两端的连接部较相邻第三金属线更粗。
其中,所述第一触摸电极串与第二触摸电极串相互交错设置的边具有脉冲式边缘或锯齿形边缘。
其中,所述第一触摸电极串以及第二触摸电极串采用钛铝钛三层复合金属,所述金属桥采用钛铝钛或者钼铝钼三层复合金属。
其中,所述第一网格电极为驱动电极和感应电极中的一种,所述第二网格电极为驱动电极和感应电极中的另一种。
其中,所述第一金属线、第二金属线以及第三金属线均沿相邻像素点中间走线,且其宽度均处于0.5~5μm范围以内。
其中,所述通孔的直径不超过相邻像素点的距离。
实施本发明实施例,具有如下有益效果:
本发明提供的触摸屏及OLED显示面板,通过在柔性OLED显示屏的薄膜封装层上制作金属网格触控感应线路,可以实现柔性显示触控的On-Cell触控方案;
而且,由于采用金属网格作为触控感应线路,使产品具有良好的耐弯折特性,且金属网格线在相邻像素点中间走线,可以最大限度减少触控传感器对OLED的光学影响;
同时,由于有效减少了触摸屏的贴合次数,其可以在实现柔性显示触控的同时,有效减薄产品厚度,同时也降低了产品生产成本。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其它的附图。
图1是现有技术中一种采用外挂式触控薄膜贴合方案的OLED显示面板的结构示意图;
图2是现有技术中一种采用玻璃封装On-Cell触控技术的OLED显示面板的结构示意图;
图3是本发明提供一种触摸屏的一个实施例的结构示意图;
图4是图3中第一触摸电极串与第二触摸电极串交叉处一个实施例的更细节的结构示意图;
图5是图4中第一触摸电极串与第二触摸电极串相邻区域的更细节的结构示意图。
图6是图3中第一触摸电极串与第二触摸电极串交叉处另一个实施例的更细节的结构示意图;
图7是图3中第三金属线的一个实施例的结构示意图;
图8是图3中第三金属线的另一个实施例的结构示意图;
图9是图3中第三金属线的又一个实施例的结构示意图;
图10是本发明提供的一种OLED显示面板的一个实施例的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚完整地描述,显然,所描述的实施例仅仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其它实施例,都属于本发明保护的范围。
在此,还需要说明的是,为了避免因不必要的细节而模糊了本发明,在附图中仅仅示出了与根据本发明的方案密切相关的结构和/或处理步骤,而省略了与本发明关系不大的其他细节。
如图3所示,示出了本发明提供的一种触摸屏的一个实施例的结构示意图,一并结合图4至图10所示,在该实施例中,所述触摸屏1包括:
在第一方向(如x方向)上排列的多个第一触摸电极串11,所述多个第一触摸电极串中的每个第一触摸电极串11包括由多条第一金属线110交叉形成的第一网格电极111,即在每一触摸电极串11中包含多个第一网格电极111,相邻第一网格电极之间通过第一金属线110电连接,所述第一金属线 110沿相邻像素点7中间走线,即像素点7位于网格内,从而网格线不会遮挡像素点7的发光区;
在第二方向(如y方向)上排列的与所述多个第一触摸电极串11交叉的位于同层的多个第二触摸电极串12,所述每个第二触摸电极串12包括由多条第二金属线120交叉形成的第二网格电极121,所述第二金属线120沿相邻像素点中间走线;在图3中,为了方便观看,其视角为金属网格触摸屏的仰视视角,故所述金属桥13位于最上层;后面图4至图6的视角类似;以及
绝缘层14,其设置于第一触摸电极串11与第二触摸电极串12的一侧;
桥金属层,包括至少一个金属桥13;
其中,所述绝缘层14的一侧与所述第一触摸电极串11以及第二触摸电极串12相接触,绝缘层14的另一侧与桥金属层相接触所述第二触摸电极串12中的相邻两个第二网格电极121通过设置于所述绝缘层上的通孔与所述金属桥13实现连通,即相邻两个第二网格电极121之间通过所述金属桥13实现电连接。
所述第一网格电极111与其相邻的第二网格电极121的相邻的边为交错设置,其第一金属线110与相邻的第二金属线120之间通过微小断开16以实现第一触摸电极串11和第二触摸电极串12之间的电学分离,在一些实施例中,所述微小断开16的距离处于3~20μm范围内。
其中,所述金属桥13两端通过设置于所述绝缘层14上的通孔分别与相邻的两个第二网格电极121实现电连接。一般地,所述通孔的直径不超过相邻像素点之间的距离,例如在一些例子中,所述通孔的直径小于15μ。
其中,每个第一触摸电极串11和每个第二触摸电极串12均连接有走线17延伸至所述触摸屏的绑定区18;可以理解的是,图3中示出的第一触摸电极串11和第二触摸电极串12的数量仅为举例,非为限制。
如图4所示,所述每个第一触摸电极串11与第二触摸电极串12相互交错设置的边具有脉冲式边缘;可以理解的是,在其他的实施例中,可以采用其他不同的交错方式,例如,在图6中示出的另一个实施例中,所述第一触摸电极串11与第二触摸电极串12相互交错设置的边具有锯齿形边缘,这样 可以增大第一网格电极111与第二网格电极121之间的接触面积,增强互电容信号。同时,图4示出的第一触摸电极串11与第二触摸电极串12中网格的形状区别仅为便于区分,而非限制,在实际产品中,第一触摸电极串11与第二触摸电极串12中可以采用相同的网格形状,具体可参见图5中的例子。
可以理解的是,在本发明的其他实施例中,其中,金属桥13可以是由至少一条第三金属线130形成的金属网格桥,其也可以具有不同的形状。如图7至图9所示,示出了三种金属网格桥的形状,其中,图7中示出的金属网格桥为由多条(如三条)第三金属线130形成的整体呈线性(条形)的金属网格桥,其中黑色圆点131为通过过孔与第二触摸电极串12进行电连接的连接部,其中,为了提高连接效果,所述金属桥13两端的连接部较相邻第三金属线130更粗;可以理解的是,采用多条第三金属线130,可以有效降低金属网格桥的阻抗;在其他的实施例中,也可以采用其他形状的金属桥13。如图8和图9分别示出了由多条第三金属线130形成的整体呈X型、双X型的金属网格桥;其中,采用更为细小的X型金属网格桥,可以减小架桥区域面积,防止架桥区域过大带来的光学干涉风险;而采用双X型的金属网格桥,在保持细小的金属网格桥的同时,降低其阻抗,从而降低了发生导通不良的几率。同时,所述第三金属线130沿相邻像素点7中间走线。
其中,所述第一网格电极111为驱动电极和感应电极中的一种,所述第二网格电极121为驱动电极和感应电极中的另一种。其中驱动电极用于输入驱动信号,感应电极用于接收检测信号,在进行触摸检测时,检测两导电线路交汇处的互电容变化或每个导电线路的自电容变化,即采取自电容或互电容的方式得到触摸点的位置。若以第一方向X和第二方向Y建立坐标系,则所得到的触摸点位置则可通过该坐标系表示,按常规做法,一般将第一方向X和第二方向Y定义为相互垂直,以使得电容检测更容易,坐标定位也更方便。当触摸屏1为其他形态(圆形、不规则形状或弯曲形状)时,也可将第一方向X和第二方向Y设置为非垂直交叉的。
在更具体的例子中,所述第一触摸电极串11以及第二触摸电极串12采用钛铝钛三层复合金属,所述金属桥13采用钛铝钛或者钼铝钼三层复合金 属,使用这种三层结构,既能防止金属氧化,又能增强触控感应线路的耐折性能。
在一个例子中,所述第一金属线110、第二金属线120以及第三金属线130的宽度处于0.5~5μm范围以内。
相应地,本发明的另一方面,还提供一种OLED显示面板,如图10所示,所述OLED显示面板包括:
衬底基板2、设于衬底基板2上的OLED层3、设于所述OLED层3上方的封装层4;以及
设置于所述封装层4上的前述的触摸屏1;
设置于所述触摸屏1上的保护层5。
更具体地,所述金属网格触摸屏1包括:
第一金属层,所述第一金属层形成金属桥13;
在所述第一金属层上设置有绝缘层14;在所述第一绝缘层位于所述金属桥13的两端形成有通孔15;
在所述绝缘层14及封装层4上沉积第二金属层,并进行蚀刻形成图形化,形成前述的多条相互交叉的第一触摸电极串11与第二触摸电极串12,其中第二触摸电极串12中的相邻第二网格电极121通过上述通孔15与所述金属桥13实现电连接。
所述金属网格触摸屏1的更多细节,可参照前述对图3至图9的描述,在此不进行赘述。
可以理解的是,在本发明中,通过在柔性OLED显示屏的封装层上制作金属网格触控感应线路,并使金属网格线路避开像素点的发光区,在相邻像素点的中间区域走线,驱动电极或感应电极至少其中一种电极通过下方金属网格桥(架桥金属)连接导通,从而可以实现柔性触摸屏,并通过减少透明光学胶的使用,使其厚度变薄膜。
实施本发明,具有如下有益效果:
本发明提供的金属网格触摸屏及OLED显示面板,通过在柔性OLED显示屏的薄膜封装层上制作金属网格触控感应线路,可以实现柔性显示触控的On-Cell触控方案;
而且,由于采用金属网格作为触控感应线路,使产品具有良好的耐弯折特性,且金属网格线在相邻像素点中间走线,可以最大限度减少触控传感器对OLED的光学影响;
同时,由于有效减少了触摸屏的贴合次数,其可以在实现柔性显示触控的同时,有效减薄产品厚度,同时也降低了产品生产成本。
需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅是本申请的具体实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本申请原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本申请的保护范围。

Claims (20)

  1. 一种触摸屏,其中,包括:
    在第一方向上排列的多个第一触摸电极串,每一所述第一触摸电极串包括多个电连接的第一网格电极;
    在第二方向上排列的与所述多个第一触摸电极串交叉的位于同层的多个第二触摸电极串,每一所述第二触摸电极串包括多个第二网格电极;
    绝缘层,其设置于所述第一触摸电极串以及第二触摸电极串的一侧;
    桥金属层,包括至少一个金属桥;
    其中,所述绝缘层的一侧与所述第一触摸电极串以及第二触摸电极串相接触,绝缘层的另一侧与桥金属层相接触,所述第二触摸电极串中的相邻两个第二网格电极通过设置于所述绝缘层上的通孔与所述金属桥实现连通。
  2. 如权利要求1所述的触摸屏,其中,所述第一网格电极包括多条第一金属线,所述第二网格电极包括多条第二金属线;
    所述第一网格电极与其相邻的第二网格电极的相邻的边为交错设置,其第一金属线与相邻的第二金属线之间通过微小断开以实现第一触摸电极串和第二触摸电极串之间的电学分离。
  3. 如权利要求2所述的触摸屏,其中,所述金属桥为由至少一条第三金属线形成的金属网格桥,所述金属网格桥整体呈线性、X型或双X型。
  4. 如权利要求3所述的触摸屏,其中,所述金属桥两端设置有连接部,所述连接部通过设置于所述绝缘层上的通孔分别与相邻的两个第二网格电极实现电连接,所述金属桥两端的连接部较相邻第三金属线更粗。
  5. 如权利要求3所述的触摸屏,其中,所述第一触摸电极串与第二触摸电极串相互交错设置的边具有脉冲式边缘或锯齿形边缘。
  6. 如权利要求5所述的触摸屏,其中,所述第一触摸电极串以及第二触摸电极串采用钛铝钛三层复合金属,所述金属桥采用钛铝钛或者钼铝钼三层复合金属。
  7. 如权利要求6所述的触摸屏,其中,所述第一网格电极为驱动电极和感应电极中的一种,所述第二网格电极为驱动电极和感应电极中的另一种。
  8. 如权利要求7所述的触摸屏,其中,所述第一金属线、第二金属线以及第三金属线均沿相邻像素点中间走线,且其宽度均处于0.5~5μm范围以内。
  9. 如权利要求8所述的触摸屏,其中,所述通孔的直径不超过相邻像素点的距离。
  10. 如权利要求9所述的触摸屏,其中,所述第一金属线与第二金属线之间的微小断开的距离处于3~20μm范围内。
  11. 一种OLED显示面板,其包括:衬底基板、设于衬底基板上的OLED层以及设于所述OLED层上方的封装层;进一步包括:
    设置于所述封装层上的触摸屏;
    设置于所述触摸屏上的保护层;
    其中,所述触摸屏包括:
    在第一方向上排列的多个第一触摸电极串,每一所述第一触摸电极串包括多个电连接的第一网格电极;
    在第二方向上排列的与所述多个第一触摸电极串交叉的位于同层的多个第二触摸电极串,每一所述第二触摸电极串包括多个第二网格电极;
    绝缘层,其设置于所述第一触摸电极串以及第二触摸电极串的一侧;
    桥金属层,包括至少一个金属桥;
    其中,所述绝缘层的一侧与所述第一触摸电极串以及第二触摸电极串相接触,绝缘层的另一侧与桥金属层相接触,所述第二触摸电极串中的相邻两个第二网格电极通过设置于所述绝缘层上的通孔与所述金属桥实现连通。
  12. 如权利要求11所述的OLED显示面板,其中,所述第一网格电极包括多条第一金属线,所述第二网格电极包括多条第二金属线;
    所述第一网格电极与其相邻的第二网格电极的相邻的边为交错设置,其第一金属线与相邻的第二金属线之间通过微小断开以实现第一触摸电极串和第二触摸电极串之间的电学分离。
  13. 如权利要求12所述的OLED显示面板,其中,所述金属桥为由至少一条第三金属线形成的金属网格桥,所述金属网格桥整体呈线性、X型或双X型。
  14. 如权利要求13所述的OLED显示面板,其中,所述金属桥两端设置有连接部,所述连接部通过设置于所述绝缘层上的通孔分别与相邻的两个第二网格电极实现电连接,所述金属桥两端的连接部较相邻第三金属线更粗。
  15. 如权利要求13所述的OLED显示面板,其中,所述第一触摸电极串与第二触摸电极串相互交错设置的边具有脉冲式边缘或锯齿形边缘。
  16. 如权利要求15所述的OLED显示面板,其中,所述第一触摸电极串以及第二触摸电极串采用钛铝钛三层复合金属,所述金属桥采用钛铝钛或者钼铝钼三层复合金属。
  17. 如权利要求16所述的OLED显示面板,其中,所述第一网格电极为驱动电极和感应电极中的一种,所述第二网格电极为驱动电极和感应电极中的另一种。
  18. 如权利要求17所述的OLED显示面板,其中,所述第一金属线、第二金属线以及第三金属线均沿相邻像素点中间走线,且其宽度均处于0.5~5μm范围以内。
  19. 如权利要求18所述的OLED显示面板,其中,所述通孔的直径不超过相邻像素点的距离。
  20. 如权利要求19所述的OLED显示面板,其中,所述第一金属线与第二金属线之间的微小断开的距离处于3~20μm范围内。
PCT/CN2018/105636 2018-08-06 2018-09-14 一种触摸屏及oled显示面板 WO2020029371A1 (zh)

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