WO2017219693A1 - 触控基板以及触控屏 - Google Patents

触控基板以及触控屏 Download PDF

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Publication number
WO2017219693A1
WO2017219693A1 PCT/CN2017/074596 CN2017074596W WO2017219693A1 WO 2017219693 A1 WO2017219693 A1 WO 2017219693A1 CN 2017074596 W CN2017074596 W CN 2017074596W WO 2017219693 A1 WO2017219693 A1 WO 2017219693A1
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WO
WIPO (PCT)
Prior art keywords
touch
edge
line segment
angle
black matrix
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2017/074596
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English (en)
French (fr)
Inventor
王庆浦
胡明
郭总杰
张雷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Publication date
Application filed by BOE Technology Group Co Ltd, Hefei Xinsheng Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US15/679,235 priority Critical patent/US10248272B2/en
Publication of WO2017219693A1 publication Critical patent/WO2017219693A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0254—High voltage adaptations; Electrical insulation details; Overvoltage or electrostatic discharge protection ; Arrangements for regulating voltages or for using plural voltages
    • H05K1/0257—Overvoltage protection
    • H05K1/0259—Electrostatic discharge [ESD] protection
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0274—Optical details, e.g. printed circuits comprising integral optical means
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09218—Conductive traces
    • H05K2201/09272—Layout details of angles or corners
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10128—Display
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10151—Sensor

Definitions

  • the present invention relates to the field of touch technologies, and in particular to a touch substrate and a touch screen.
  • Electrostatic discharge may cause poor performance of the internal components of the touch screen or permanent breakdown due to breakdown, such as an open or short circuit inside the touch screen.
  • the existing touch substrate includes a touch area for performing touch detection and a black matrix pattern surrounding the touch area.
  • the black matrix pattern is generally made of carbon balls.
  • the black matrix pattern has good insulation performance, but after a plurality of high temperatures After the process, the resistivity of the black matrix pattern is lowered, and the insulation performance is lowered, so that when the static charge of the device or the human body contacts the touch electrode overlapping the black matrix pattern, an extremely large discharge is instantaneously formed between the different touch electrodes.
  • the current causes the breakdown of the black matrix pattern, causing an open circuit or a short circuit between the touch electrodes, resulting in poor or permanent failure of the touch performance of the corresponding area.
  • the technical problem to be solved by the present invention is to provide a touch substrate and a touch screen, which can improve the anti-ESD capability of the touch screen.
  • an embodiment of the present invention provides the following technical solutions:
  • a touch substrate including a touch area and a black matrix pattern surrounding the touch area, wherein the touch substrate is provided with a plurality of touch electrode patterns, wherein the touch electrodes are
  • the graphic includes a first portion lapped on the black matrix graphic, In the first portion, if the angle formed by the extension line of the first edge and the second edge is less than 120°, the first edge and the second edge are formed to be connected by using at least one third edge, so that An angle between the edges of the edge, the second edge, and the third edge adjacent to each other is greater than 120°.
  • the first portion includes a first line segment, a second line segment, ..., and an nth line segment that are connected end to end in sequence, wherein an angle between the kth line segment and the k+1th line segment is greater than a preset threshold.
  • k is an integer not less than 1 and not more than n-1, and n is a positive integer greater than 2.
  • n is a positive integer less than 10.
  • the lengths of the second line segment, ..., and the n-1th line segment are equal.
  • the lengths of the second line segment, . . . , and the n-1th line segment are both greater than 1.5d, where d is the spacing between adjacent touch electrode patterns.
  • the lengths of the second line segment, ..., and the n-1th line segment are both equal to 2d.
  • an angle between any adjacent two sides of the first portion is less than 170°.
  • an angle between any adjacent two sides of the first portion is 150°.
  • the embodiment of the invention further provides a touch screen comprising a display panel and the touch substrate as described above.
  • the embodiment of the present invention further provides a touch substrate including a touch area and a black matrix pattern surrounding the touch area, wherein the touch substrate is provided with a plurality of touch electrode patterns, wherein The touch electrode pattern includes a first portion overlapping the black matrix pattern, and in the first portion, if the angle formed by the extension line of the first edge and the second edge is less than 120°, the An edge and a second edge are formed to be joined by at least one third edge, and the third edge at least partially has a rounded shape.
  • the rounded shape is composed of a circular arc curve.
  • the radius of curvature of the arcuate curve is greater than a predetermined threshold.
  • the embodiment of the invention further provides a touch screen, comprising: a display panel and a touch substrate according to the invention.
  • the touch electrode pattern is overlapped in the black matrix.
  • the angle between any adjacent two sides of the graphic is greater than a preset threshold, so that the electric field intensity of the touch electrode pattern overlapping the tip position on the black matrix pattern can be reduced, thereby reducing the breakdown of the black matrix pattern.
  • the risk improves the anti-ESD capability of the edge region of the touch substrate, thereby improving the ESD resistance of the overall product, thereby improving the production yield of the touch substrate.
  • FIG. 1 is a schematic view of a touch electrode pattern in a conventional touch substrate
  • FIG. 2 is a schematic diagram showing a relationship between an angle between adjacent two sides of a touch electrode pattern and a black matrix breakdown voltage
  • 3a-3d are schematic diagrams showing the relationship between the angle between the adjacent sides of the touch electrode pattern and the electric field strength
  • FIG. 4 is a schematic diagram showing a relationship between an angle between adjacent two sides of a touch electrode pattern and an electric field intensity
  • FIG. 5 is a schematic structural diagram of a touch electrode pattern of a touch substrate according to an embodiment of the present invention.
  • Figure 6 is an enlarged schematic view of a portion A of Figure 5;
  • FIG. 7 is an enlarged partial view showing a touch electrode pattern of a touch substrate according to another embodiment of the present invention.
  • the conventional touch substrate includes a touch area for performing touch detection and a black matrix pattern 3 surrounding the touch area, and the touch area is provided with touch.
  • the electrode pattern 1 and the touch electrode pattern 1 include a first portion 2 lapped on the black matrix pattern 3. It can be seen that the angle between any adjacent two sides of the first portion 2 is relatively small, so that the tip position of the touch electrode pattern is The surface density of the charge is large, and the electric field strength is high. Electrostatic discharge is likely to occur between adjacent touch electrode patterns, resulting in breakdown of the surrounding black matrix pattern, resulting in an open or short circuit between the touch electrode patterns, resulting in corresponding areas. Touch performance is poor or permanent.
  • the present invention provides a touch substrate, a manufacturing method thereof, and a touch screen, which can improve the anti-ESD capability of the touch screen.
  • the touch panel includes a touch area and a black matrix pattern surrounding the touch area.
  • the touch substrate is provided with a plurality of touch electrode patterns, and the touch electrode pattern includes a lap joint. In a first portion of the black matrix pattern, an angle between any adjacent two sides of the first portion is greater than a predetermined threshold.
  • the first edge and the second edge are formed to utilize at least A third edge is connected such that an angle between the first edge, the second edge, and the two edges adjacent to each other in the third edge is greater than the predetermined threshold.
  • the touch electrode pattern is overlapped in the black matrix.
  • the angle between any adjacent two sides of the graphic is greater than a preset threshold, so that the electric field intensity of the touch electrode pattern overlapping the tip position on the black matrix pattern can be reduced, thereby reducing the breakdown of the black matrix pattern. Risk, improved
  • the anti-ESD capability of the edge region of the touch substrate improves the ESD resistance of the overall product, thereby improving the production yield of the touch substrate.
  • the touch substrate of this embodiment may be a mutual capacitive touch substrate or a self-capacitive touch substrate.
  • the touch electrode includes a touch sensing electrode and a touch driving electrode, and the touch sensing electrode or the touch driving electrode on the black matrix pattern is arbitrarily adjacent to the two sides. The angle between them is greater than the preset threshold.
  • the touch electrode is a self-capacitive touch electrode, and the angle between any adjacent two sides of the first portion of the self-capacitive touch electrode on the black matrix pattern is overlapped. Greater than the preset threshold.
  • the touch sensing electrode can be arbitrarily adjacent to the first portion of the black matrix pattern.
  • the angle between the two sides is designed to be greater than a preset threshold.
  • the touch electrode pattern overlapping the black matrix pattern can be changed, and the touch electrode pattern of the touch area located at the center of the touch substrate can be the same as the prior art shape because The touch area in the center of the touch substrate does not have a black matrix pattern, and ESD is not easy to occur. Therefore, the touch electrode pattern of the touch area can be changed without affecting the performance of the touch substrate.
  • the first portion includes a first line segment, a second line segment, a third line segment, ..., and an nth line segment that are connected end to end in sequence, wherein an angle between the kth line segment and the k+1th line segment is greater than
  • the preset threshold, k is an integer not less than 1 and not greater than n-1, and n is a positive integer greater than 2.
  • n is a positive integer less than 10.
  • the lengths of the second line segment, the third line segment, ..., and the n-1th line segment may be equal.
  • the tip electric field concentration range is less than d at the angle, so the lengths of the second line segment, the third line segment, ..., and the n-1th line segment can be designed to be greater than 1.5d, so that the touch is
  • the electric field strength at the tip of the electrode pattern will drop significantly, where d is the spacing between adjacent touch electrode patterns (as shown in Figure 6).
  • the lengths of the second line segment, the third line segment, ..., and the n-1th line segment are both equal to 2d, so that the touch can be made without changing the touch electrode pattern.
  • the electric field strength at the tip of the electrode pattern is greatly reduced.
  • FIG. 2 is a schematic diagram showing the relationship between the angle between adjacent two sides of the touch electrode pattern and the black matrix breakdown voltage. As can be seen from FIG. 2, after the angle between the adjacent sides of the touch electrode pattern is increased, The breakdown voltage of the black matrix pattern is greatly improved.
  • 3a-3d are schematic diagrams showing the relationship between the angle ⁇ between adjacent sides of the touch electrode pattern and the electric field strength, wherein the denser the dots, the greater the electric field strength.
  • 4 is a schematic diagram showing the relationship between the angle between adjacent two sides of the touch electrode pattern and the electric field intensity. It can be seen from the figure that when the angle between the adjacent sides of the touch electrode pattern is 60-120°, the electric field at the tip of the touch electrode pattern is strong, and the angle between the adjacent sides of the touch electrode pattern is At 150-180°, the electric field strength at the tip of the touch electrode pattern is significantly reduced. As the angle between adjacent two sides of the touch electrode pattern increases, the intensity of the highest electric field of the tip of the touch electrode pattern is weakened, thereby increasing the breakdown voltage of the black matrix pattern and reducing the risk of breakdown of the black matrix pattern. .
  • the electric field intensity of the tip of the touch electrode pattern is significantly weakened when the angle between any adjacent two sides of the touch electrode pattern is greater than 120°. Therefore, in this embodiment, between any adjacent two sides of the first portion The angle is greater than 120°.
  • the first edge and the second edge are formed to utilize at least one piece
  • the third edge is joined such that an angle between the two edges of the first edge, the second edge, and the third edge adjacent to each other is greater than 120°.
  • the electric field strength of the tip of the touch electrode pattern will rapidly decrease.
  • the angle between any adjacent two sides of the first portion is 150°, so that the electric field strength of the tip of the touch electrode pattern is greatly reduced when the touch electrode pattern is not changed much.
  • the angle between any adjacent two sides indicates the smaller of the pair of angles formed by the two sides.
  • the present invention is not limited thereto, and the larger of the two angles may be used to represent the angle between adjacent sides, in which case the angle range is the angle and the circumference angle in the foregoing embodiment (360). °)
  • the embodiment further provides a touch screen, including a display panel and the touch substrate as described above, and the touch screen can be applied in a human-machine interaction device.
  • the embodiment of the present invention provides a method for fabricating a touch substrate.
  • the touch substrate includes a touch area and a black matrix pattern surrounding the touch area.
  • the touch electrode pattern includes a first portion overlapping the black matrix pattern, and an angle between any adjacent two sides of the first portion is greater than a preset threshold.
  • the touch electrode pattern is overlapped in the black matrix.
  • the angle between any adjacent two sides of the graphic is greater than a preset threshold, so that the electric field intensity of the touch electrode pattern overlapping the tip position on the black matrix pattern can be reduced, thereby reducing the breakdown of the black matrix pattern.
  • the risk improves the anti-ESD capability of the edge region of the touch substrate, thereby improving the ESD resistance of the overall product, thereby improving the production yield of the touch substrate.
  • the forming the plurality of touch electrode patterns comprises:
  • first portion including the first line segment, the second line segment, the third line segment, ..., and the nth line segment that are sequentially connected end to end, wherein an angle between the kth line segment and the k+1th line segment is greater than a pre
  • a threshold k be an integer not less than 1 and not greater than n-1, and n be a positive integer greater than 2.
  • n is a positive integer less than 10.
  • the manufacturing method specifically includes:
  • the forming the first portion between any adjacent two sides having an angle greater than 120° and less than 170° is specifically:
  • the first portion having an angle between any adjacent two sides of 150° is formed, so that the electric field strength of the tip of the touch electrode pattern is greatly reduced when the touch electrode pattern is not changed much.
  • the manufacturing method of the touch substrate generally includes the following processes:
  • the first photolithography process forming a black matrix pattern on the substrate, the black matrix pattern covering the edge region of the touch substrate;
  • a fourth photolithography process forming a pattern of touch electrodes on the substrate; in the edge region of the touch substrate, the touch electrodes are overlapped on the black matrix pattern;
  • the touch lithography pattern is formed by the fourth lithography process
  • the first portion of the touch electrode pattern overlapped on the black matrix pattern is improved, so that the angle between any adjacent two sides of the first portion is improved. It is greater than the preset threshold, so that the technical solution of the embodiment can be implemented without increasing the patterning process, and the difficulty of the manufacturing process of the touch substrate is not increased.
  • the touch substrate of the present embodiment includes a touch area and a black matrix pattern 3 surrounding the touch area.
  • the touch substrate is provided with a plurality of touch electrode patterns 1 and a touch electrode pattern 1
  • the first part 2 is overlapped on the black matrix pattern 3.
  • the first part 2 includes a first line segment D1, a second line segment D2, a third line segment D3, and a fourth line segment D4 which are sequentially connected end to end.
  • the fifth line segment D5 and the sixth line segment D6 form an angle ⁇ between two adjacent line segments.
  • the number of segments included in the first part is not limited to 6, It can also be other natural numbers greater than 2.
  • the first portion including the number of line segments may be less than 10.
  • the lengths of the second line segment D2, the third line segment D3, the fourth line segment D4, and the fifth line segment D5 may be equal.
  • the electric field concentration of the tip of the touch electrode pattern is within 30 um, so the second line segment D2, the third line segment D3, and the fourth line segment can be
  • the length d1 of the D4 and the fifth line segment D5 is designed to be 60 um, so that the electric field strength of the tip of the first portion is greatly reduced, thereby reducing the risk of breakdown of the black matrix pattern and improving the ESD resistance of the edge region of the touch substrate, thereby improving
  • the overall product's anti-ESD capability improves the production yield of the touch substrate.
  • the first portion 2 of the touch electrode pattern 1 is formed of a plurality of straight segments, but the present invention is not limited thereto. In other embodiments of the invention, the first portion 2 of the touch electrode pattern 1 may also be formed by curved segments.
  • FIG. 7 is a partial enlarged view of a touch electrode pattern of a touch substrate according to another embodiment of the present invention.
  • the touch substrate according to the embodiment includes a touch area and surrounding the touch area. a black matrix pattern
  • the touch substrate is provided with a plurality of touch electrode patterns, wherein the touch electrode pattern comprises a first portion overlapping the black matrix pattern, and the first portion is formed as Has a rounded shape of 5.
  • portions which may originally form sharp corners with each other (for example, as shown in Fig. 1) are connected to each other by edges having a rounded shape, thereby avoiding the formation of sharp sharp corners.
  • the first edge and the second edge are formed as At least one third edge connection is utilized, and the third edge has a rounded shape at least in part.
  • the rounded shape indicates that the edge of the first portion does not have a sharp corner, but the first portion is composed of a circular arc-shaped transition.
  • the rounded shape can be made up of one One or more arc curves.
  • the rounded shape may be a shape that is smoothly and gradually transitioned from one edge to the other.
  • the rounded shape may be, for example, a substantially circular shape (eg, semi-circular, quarter-circular, etc.), a substantially arcuate shape, a substantially parabolic shape, and the like, and between Any combination can be avoided as long as a sharp angle between the two edges can be avoided.
  • the radius of curvature of the arcuate curve constituting the first portion having the rounded shape may be greater than a predetermined threshold such that the rounded shape has a relatively gentle curved shape.
  • the radius of curvature may be larger than 30 ⁇ m, but the present invention is not limited thereto, and the circular arc curve constituting the first portion having a rounded shape may have a radius of curvature in other ranges or may be composed of a plurality of circular arc curves having different curvature radii.
  • the electric field intensity of the tip of the first portion is greatly reduced, thereby reducing the risk of breakdown of the black matrix pattern and improving the edge region of the touch substrate.
  • the anti-ESD capability improves the ESD resistance of the overall product, thereby increasing the production yield of the touch substrate.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Position Input By Displaying (AREA)

Abstract

本发明提供了一种触控基板以及一种触控屏，属于触控技术领域。其中，触控基板，包括触控区域和包围所述触控区域的黑矩阵图形，所述触控基板上设置有多个触控电极图形，其特征在于，所述触控电极图形包括搭接在所述黑矩阵图形上的第一部分，在所述第一部分中，如果第一边缘与第二边缘的延长线所形成的夹角小于120°，则将所述第一边缘和第二边缘形成为利用至少一条第三边缘连接，使得第一边缘、第二边缘和所述第三边缘中彼此相邻的两个边缘之间的夹角大于120°。本发明的技术方案能够提高触控屏的抗ESD能力。

Description

触控基板以及触控屏 技术领域
本发明涉及触控技术领域，特别是指一种触控基板以及一种触控屏。
背景技术
近年来，随着移动电子设备操控性的提升和电子技术的发展，触控屏技术在手机、平板、笔记本电脑等电子设备中有了广泛的应用。触摸技术的发展出现了电阻、电容、电磁等不同的技术方向，电容式触控屏凭借其低廉的成本和优异的用户体验已成为主流产品。
随着电容式触控屏的快速成长，人们对触控产品的ESD(Electro-Static Discharge，静电释放)性能也要求越来越高。静电释放可能造成触控屏内部器件性能变差或者击穿导致永久性失效，比如触控屏内部的开路或者短路。
现有的触控基板包括进行触控检测的触控区域和包围触控区域的黑矩阵图形，黑矩阵图形一般采用碳球制成，通常黑矩阵图形的绝缘性能较好，但是经过多道高温制程之后，黑矩阵图形的电阻率降低，绝缘性能下降，这样当设备或人体的静电荷接触到搭接在黑矩阵图形上的触控电极时，在不同触控电极之间瞬间形成极大放电电流，导致黑矩阵图形的击穿，造成触控电极之间开路或短路，导致对应区域的触控性能变差或者永久性失效。
发明内容
本发明要解决的技术问题是提供一种触控基板以及一种触控屏，能够提高触控屏的抗ESD能力。
为解决上述技术问题，本发明的实施例提供技术方案如下：
一方面，提供一种触控基板，包括触控区域和包围所述触控区域的黑矩阵图形，所述触控基板上设置有多个触控电极图形，其特征在于，所述触控电极图形包括搭接在所述黑矩阵图形上的第一部分， 在所述第一部分中，如果第一边缘与第二边缘的延长线所形成的夹角小于120°，则将所述第一边缘和第二边缘形成为利用至少一条第三边缘连接，使得第一边缘、第二边缘和所述第三边缘中彼此相邻的两个边缘之间的夹角大于120°。
进一步地，所述第一部分包括依次首尾相接的第一线段、第二线段、…、和第n线段，其中，第k线段和第k+1线段之间的夹角大于预设阈值，k为不小于1不大于n-1的整数，n为大于2的正整数。
进一步地，n为小于10的正整数。
第二线段、…、和第n-1线段的长度均相等。
进一步地，第二线段、…、和第n-1线段的长度均大于1.5d，其中，d为相邻触控电极图形之间的间距。
第二线段、…、和第n-1线段的长度均等于2d。
进一步地，所述第一部分的任意相邻两边之间的夹角小于170°。
进一步地，所述第一部分的任意相邻两边之间的夹角为150°。
本发明实施例还提供了一种触控屏，包括显示面板以及如上所述的触控基板。
本发明实施例还提供了一种触控基板，包括触控区域和包围所述触控区域的黑矩阵图形，所述触控基板上设置有多个触控电极图形，其特征在于，所述触控电极图形包括搭接在所述黑矩阵图形上的第一部分，在所述第一部分中，如果第一边缘与第二边缘的延长线所形成的夹角小于120°，则将所述第一边缘和第二边缘形成为利用至少一条第三边缘连接，并且所述第三边缘至少部分地具有圆滑形状。
另一方面，所述圆滑形状由圆弧形曲线组成。
另一方面，所述圆弧形曲线的曲率半径大于预定的阈值。
本发明实施例还提供了一种触控屏，包括：显示面板以及根据本发明的触控基板。
本发明的实施例具有以下有益效果：
在搭接在黑矩阵图形上的触控电极图形相邻两边的夹角较小时，触控电极图形尖端位置电荷面密度较大，电场强度较高，这样相 邻的触控电极图形之间容易发生静电释放，导致周边的黑矩阵图形被击穿。经过大量实验验证，发现随着触控电极图形相邻两边的夹角的增大，触控电极图形尖端的电场强度将会减弱，因此，本实施例中，触控电极图形搭接在黑矩阵图形上的部分任意相邻两边之间的夹角大于预设阈值，这样就能够降低触控电极图形搭接在黑矩阵图形上的尖端位置的电场强度，从而降低了黑矩阵图形被击穿的风险，提高了触控基板边缘区域的抗ESD能力，从而提高整体产品的抗ESD能力，进而提高了触控基板的生产良率。
附图说明
附图是用来提供对本发明的进一步理解，并且构成说明书的一部分，与下面的具体实施方式一起用于解释本发明，但并不构成对本发明的限制。在附图中：
图1为现有触控基板中触控电极图形的示意图；
图2为触控电极图形相邻两边之间的夹角与黑矩阵击穿电压之间的关系示意图；
图3a-图3d为触控电极图形相邻两边之间的夹角与电场强度之间的关系示意图；
图4为触控电极图形相邻两边之间的夹角与电场强度之间的关系示意图；
图5为本发明实施例触控基板的触控电极图形的结构示意图；
图6为图5中A部分的放大示意图；以及
图7为根据本发明另一实施例的触控基板的触控电极图形的局部结构放大图。
附图标记
1触控电极图形 2第一部分 3黑矩阵图形 5圆滑形状
具体实施方式
为使本发明的实施例要解决的技术问题、技术方案和优点更加 清楚，下面将结合附图及具体实施例进行详细描述。
图1为现有触控基板中触控电极图形的示意图，现有的触控基板包括进行触控检测的触控区域和包围触控区域的黑矩阵图形3，在触控区域设置有触控电极图形1，触控电极图形1包括有搭接在黑矩阵图形3上的第一部分2，可以看出，第一部分2任意相邻两边之间的夹角比较小，这样触控电极图形尖端位置电荷面密度较大，电场强度较高，相邻的触控电极图形之间容易发生静电释放，导致周边的黑矩阵图形被击穿，造成触控电极图形之间开路或短路，导致对应区域的触控性能变差或者永久性失效。
为了解决上述问题，本发明提供了一种触控基板及其制作方法、触控屏，能够提高触控屏的抗ESD能力。
实施例一
本实施例提供一种触控基板，包括触控区域和包围所述触控区域的黑矩阵图形，所述触控基板上设置有多个触控电极图形，所述触控电极图形包括搭接在所述黑矩阵图形上的第一部分，所述第一部分的任意相邻两边之间的夹角大于预设阈值。
根据本实施例，例如，在所述第一部分中，如果第一边缘与第二边缘的延长线所形成的夹角小于预设阈值，则将所述第一边缘和第二边缘形成为利用至少一条第三边缘连接，使得第一边缘、第二边缘和所述第三边缘中彼此相邻的两个边缘之间的夹角大于该预设阈值。利用上述结构，可以使所述第一部分的任意相邻两边之间的夹角大于预设阈值。
在搭接在黑矩阵图形上的触控电极图形相邻两边的夹角较小时，触控电极图形尖端位置电荷面密度较大，电场强度较高，这样相邻的触控电极图形之间容易发生静电释放，导致周边的黑矩阵图形被击穿。经过大量实验验证，发现随着触控电极图形相邻两边的夹角的增大，触控电极图形尖端的电场强度将会减弱，因此，本实施例中，触控电极图形搭接在黑矩阵图形上的部分任意相邻两边之间的夹角大于预设阈值，这样就能够降低触控电极图形搭接在黑矩阵图形上的尖端位置的电场强度，从而降低了黑矩阵图形被击穿的风险，提高了 触控基板边缘区域的抗ESD能力，从而提高整体产品的抗ESD能力，进而提高了触控基板的生产良率。
本实施例的触控基板可以是互容式触摸基板也可以是自容式触控基板。当触控基板为互容式触摸基板时，触控电极包括触控感应电极和触控驱动电极，搭接在黑矩阵图形上的触控感应电极或触控驱动电极的第一部分任意相邻两边之间的夹角大于预设阈值。当触控基板为自容式触控基板时，触控电极为自容式触控电极，搭接在黑矩阵图形上的自容式触控电极的第一部分任意相邻两边之间的夹角大于预设阈值。
在触控基板为互容式触摸基板时，由于黑矩阵图形被击穿对触控感应信号的影响较大，因此，可以将触控感应电极搭接在黑矩阵图形上的第一部分任意相邻两边之间的夹角设计为大于预设阈值。
另外，本实施例中，可以仅对搭接在黑矩阵图形上的触控电极图形进行改变，位于触控基板中心的触控区域的触控电极图形可以与现有技术的形状一样，因为位于触控基板中心的触控区域不存在黑矩阵图形，不易发生ESD，因此，可以不对触控区域的触控电极图形进行改变，避免影响到触控基板的性能。
具体实施例中，第一部分包括依次首尾相接的第一线段、第二线段、第三线段、…、和第n线段，其中，第k线段和第k+1线段之间的夹角大于预设阈值，k为不小于1不大于n-1的整数，n为大于2的正整数。
在一个实施例中，可选地，n为小于10的正整数。
具体地，第二线段、第三线段、…、和第n-1线段的长度可以均相等。
经过大量实验验证，发现在夹角处，尖端电场集中范围小于d，因此，可以将第二线段、第三线段、…、和第n-1线段的长度均设计为大于1.5d，这样触控电极图形尖端的电场强度将大幅下降，其中，d为相邻触控电极图形之间的间距(如图6所示)。
优选地，第二线段、第三线段、…、和第n-1线段的长度均等于2d，这样在对触控电极图形改动不太大的情况下就可以使得触控 电极图形尖端的电场强度大幅下降。
图2为触控电极图形相邻两边之间的夹角与黑矩阵击穿电压之间的关系示意图，由图2可以看出，在触控电极图形相邻两边之间的夹角增大后，黑矩阵图形的击穿电压大大提高。
图3a-图3d为触控电极图形相邻两边之间的夹角α与电场强度之间的关系示意图，其中的点越密集，代表电场强度越大。图4为触控电极图形相邻两边之间的夹角与电场强度之间的关系示意图。从图中可以看出，在触控电极图形相邻两边之间的夹角为60-120°时，触控电极图形尖端电场较强，在触控电极图形相邻两边之间的夹角为150-180°时，触控电极图形尖端电场强度明显减弱。随着触控电极图形相邻两边之间的夹角增大，触控电极图形尖端最高电场的强度减弱，从而增大了黑矩阵图形的击穿电压，降低了黑矩阵图形被击穿的风险。
由于在触控电极图形任意相邻两边之间的夹角大于120°时，触控电极图形尖端的电场强度将会明显减弱，因此，本实施例中，第一部分的任意相邻两边之间的夹角大于120°。
因此，根据本实施例，在所述第一部分中，如果第一边缘与第二边缘的延长线所形成的夹角小于120°，则将所述第一边缘和第二边缘形成为利用至少一条第三边缘连接，使得第一边缘、第二边缘和所述第三边缘中彼此相邻的两个边缘之间的夹角大于120°。
优选地，在触控电极图形任意相邻两边之间的夹角大于120°小于170°时，触控电极图形尖端的电场强度将会迅速下降。
进一步地，第一部分的任意相邻两边之间的夹角为150°，这样在对触控电极图形改动不太大的情况下就可以使得触控电极图形尖端的电场强度大幅下降。
在本发明中，任意相邻两边之间的夹角表示由这两个边形成的一对角中较小的那一个。然而本发明不限于此，也可以使用这两个角度中较大的那一个来表示相邻两边的夹角，在这种情况下，该角度范围为前述实施例中的角度与周角(360°)之差的范围。例如，对于第一部分的任意相邻两边之间的夹角为150°的实施例，其可以被表 示为360°-150°＝210°。
实施例二
本实施例还提供了一种触控屏，包括显示面板以及如上所述的触控基板，该触控屏可以应用在人机交互设备中。
实施例三
本实施例提供了一种触控基板的制作方法，所述触控基板包括触控区域和包围所述触控区域的黑矩阵图形，所述制作方法包括：
形成多个触控电极图形，所述触控电极图形包括搭接在所述黑矩阵图形上的第一部分，所述第一部分的任意相邻两边之间的夹角大于预设阈值。
在搭接在黑矩阵图形上的触控电极图形相邻两边的夹角较小时，触控电极图形尖端位置电荷面密度较大，电场强度较高，这样相邻的触控电极图形之间容易发生静电释放，导致周边的黑矩阵图形被击穿。经过大量实验验证，发现随着触控电极图形相邻两边的夹角的增大，触控电极图形尖端的电场强度将会减弱，因此，本实施例中，触控电极图形搭接在黑矩阵图形上的部分任意相邻两边之间的夹角大于预设阈值，这样就能够降低触控电极图形搭接在黑矩阵图形上的尖端位置的电场强度，从而降低了黑矩阵图形被击穿的风险，提高了触控基板边缘区域的抗ESD能力，从而提高整体产品的抗ESD能力，进而提高了触控基板的生产良率。
具体实施例中，所述形成多个触控电极图形包括：
形成包括依次首尾相接的第一线段、第二线段、第三线段、…、和第n线段的所述第一部分，其中，第k线段和第k+1线段之间的夹角大于预设阈值，k为不小于1不大于n-1的整数，n为大于2的正整数。
在一个实施例中，可选地，n为小于10的正整数。
由于在触控电极图形任意相邻两边之间的夹角大于120°小于170°时，触控电极图形尖端的电场强度将会迅速下降，因此，所述制作方法具体包括：
形成任意相邻两边之间的夹角大于120°小于170°的所述第一 部分。
进一步地，所述形成任意相邻两边之间的夹角大于120°小于170°的所述第一部分具体为：
形成任意相邻两边之间的夹角为150°的所述第一部分，这样在对触控电极图形改动不太大的情况下就可以使得触控电极图形尖端的电场强度大幅下降。
触控基板的制作方法通常包括以下工艺：
1、第一次光刻工艺，在衬底基板上形成黑矩阵图形，黑矩阵图形覆盖触控基板的边缘区域；
2、第二次光刻工艺，在衬底基板上形成用于连接触控电极的架桥；
3、第三次光刻工艺，在衬底基板上形成覆盖架桥的树脂绝缘层；
4、第四次光刻工艺，在衬底基板上形成触控电极的图形，在触控基板的边缘区域，触控电极搭接在黑矩阵图形上；
5、第五次光刻工艺，在衬底基板上的黑矩阵图形上形成外围金属走线；
6、第六次光刻工艺，在衬底基板上形成至少覆盖外围金属走线的树脂保护层。
本实施例中，在第四次光刻工艺形成触控电极图形时，对触控电极图形搭接在黑矩阵图形上的第一部分进行改进，使第一部分的任意相邻两边之间的夹角大于预设阈值，这样能够在不增加构图工艺的情况下实现本实施例的技术方案，不增加触控基板的制作工艺的难度。
实施例四
如图5和图6所示，本实施例的触控基板包括触控区域和包围触控区域的黑矩阵图形3，触控基板上设置有多个触控电极图形1，触控电极图形1包括搭接在黑矩阵图形3上的第一部分2，由图6可以看出，第一部分2包括依次首尾相接的第一线段D1、第二线段D2、第三线段D3、第四线段D4、第五线段D5和第六线段D6，相邻两个线段之间形成夹角α。当然，第一部分包括线段的数目并不局限为6， 还可以为其他大于2的自然数。可选地，为了容易地实现该工艺，第一部分包括线段的数目可以小于10。
根据图3a-图3d和图4所示，在相邻两个线段之间的夹角α在150-180°范围内时，触控电极图形尖端的电场强度将迅速下降，因此，本实施例将相邻两个线段之间的夹角α设计为150°。
具体地，第二线段D2、第三线段D3、第四线段D4和第五线段D5的长度可以相等。
由于在相邻两个线段之间的夹角α为60-150°时，触控电极图形尖端的电场集中范围在30um以内，因此，可以将第二线段D2、第三线段D3、第四线段D4和第五线段D5的长度d1设计为60um，这样第一部分尖端的电场强度将大幅下降，从而降低了黑矩阵图形被击穿的风险，提高了触控基板边缘区域的抗ESD能力，从而提高整体产品的抗ESD能力，进而提高了触控基板的生产良率。
在前述实施例中，触控电极图形1的第一部分2由多个直线段形成，然而本发明不限于此。在本发明的其它实施例中，触控电极图形1的第一部分2也可以由曲线段形成。
图7示出了根据本发明另一实施例的触控基板的触控电极图形的局部结构放大图，参照图7，根据该实施例的触控基板包括触控区域和包围所述触控区域的黑矩阵图形，所述触控基板上设置有多个触控电极图形，其特征在于，所述触控电极图形包括搭接在所述黑矩阵图形上的第一部分，所述第一部分形成为具有圆滑形状5。利用该圆滑形状5，使得原本可能彼此形成尖锐的尖角的部分(例如参见图1所示)通过具有圆滑形状的边缘彼此连接，从而避免了形成尖锐的尖角。
因此，根据本实施例，述第一部分中，如果第一边缘与第二边缘的延长线所形成的夹角小于预定阈值(例如120°)，则将所述第一边缘和第二边缘形成为利用至少一条第三边缘连接，并且所述第三边缘至少部分地具有圆滑形状。
在本实施例中，圆滑形状表示第一部分的边缘不具有尖角，而是由圆弧形的过渡组成了所述第一部分。例如，该圆滑形状可以由一 个或多个圆弧形曲线组成。
例如，该圆滑形状可为由从一条边缘的方向平缓地、逐渐地过渡到另一条边缘的方向的形状。该圆滑形状可以是例如基本上为圆形的形状(例如半圆形、四分之一圆形等)、基本上为弧形的形状、基本上为抛物线形的方向等形状以及它们之间的任意组合，只要能够避免两条边缘之间产生尖锐的夹角即可。
根据本发明的一些实施例，组成具有圆滑形状的第一部分的圆弧形曲线的曲率半径可以大于预定的阈值，从而使圆滑形状具有相对平缓的弯曲形状。例如，该曲率半径可以大于30μm，然而本发明不限于此，组成具有圆滑形状的第一部分的圆弧形曲线可具有其它范围内的曲率半径或者由具有不同曲率半径的多段圆弧形曲线组成。
本发明的其它实施例还提供了一种触控屏，包括：显示面板；以及根据前述实施例所述的触控基板。
本发明的其它实施例还提供了一种触控基板的制作方法，所述触控基板包括触控区域和包围所述触控区域的黑矩阵图形，其特征在于，所述制作方法包括：在所述触控区域中形成多个触控电极图形，所述触控电极图形包括搭接在所述黑矩阵图形上的第一部分，在所述第一部分中，如果第一边缘与第二边缘的延长线所形成的夹角小于120°，则将所述第一边缘和第二边缘形成为利用至少一条第三边缘连接，并且所述第三边缘至少部分地具有圆滑形状。
本实施例中未详细描述的特征可以参考前述实施例，因此在这里不再重复描述。
根据本实施例，通过使触控电极图形的第一部分被形成为具有圆滑形状，第一部分尖端的电场强度将大幅下降，从而降低了黑矩阵图形被击穿的风险，提高了触控基板边缘区域的抗ESD能力，从而提高整体产品的抗ESD能力，进而提高了触控基板的生产良率。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (13)

  1. 一种触控基板，包括触控区域和包围所述触控区域的黑矩阵图形，所述触控基板上设置有多个触控电极图形，其中，所述触控电极图形包括搭接在所述黑矩阵图形上的第一部分，在所述第一部分中，如果第一边缘与第二边缘的延长线所形成的夹角小于120°，则将所述第一边缘和第二边缘形成为利用至少一条第三边缘连接，使得第一边缘、第二边缘和所述第三边缘中彼此相邻的两个边缘之间的夹角大于120°。
  2. 根据权利要求1所述的触控基板，其中，所述第一部分包括依次首尾相接的第一线段、第二线段、…、和第n线段，其中，第k线段和第k+1线段之间的夹角大于预设阈值，k为不小于1不大于n-1的整数，n为大于2的正整数。
  3. 根据权利要求2所述的触控基板，其中，n为小于10的正整数。
  4. 根据权利要求2或3所述的触控基板，其中，第二线段、…、和第n-1线段的长度均相等。
  5. 根据权利要求2-4中的任一项所述的触控基板，其中，第二线段、…、和第n-1线段的长度均大于1.5d，其中，d为相邻触控电极图形之间的间距。
  6. 根据权利要求2-5中的任一项所述的触控基板，其中，第二线段、…、和第n-1线段的长度均等于2d。
  7. 根据权利要求1所述的触控基板，其中，所述第一部分的任意相邻两边之间的夹角小于170°。
  8. 根据权利要求7所述的触控基板，其中，所述第一部分的任意相邻两边之间的夹角为150°。
  9. 一种触控屏，包括：
    显示面板；以及
    根据权利要求1-8中任一项所述的触控基板。
  10. 一种触控基板，包括触控区域和包围所述触控区域的黑矩 阵图形，所述触控基板上设置有多个触控电极图形，其中，所述触控电极图形包括搭接在所述黑矩阵图形上的第一部分，在所述第一部分中，如果第一边缘与第二边缘的延长线所形成的夹角小于120°，则将所述第一边缘和第二边缘形成为利用至少一条第三边缘连接，并且所述第三边缘至少部分地具有圆滑形状。
  11. 根据权利要求10所述的触控基板，其中，所述圆滑形状由圆弧形曲线组成。
  12. 根据权利要求10或11所述的触控基板，其中，所述圆弧形曲线的曲率半径大于预定的阈值。
  13. 一种触控屏，包括：
    显示面板；以及
    根据权利要求10-12中任一项所述的触控基板。
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