WO2015021619A1 - 电容触控单元及电容式触摸屏 - Google Patents

电容触控单元及电容式触摸屏 Download PDF

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Publication number
WO2015021619A1
WO2015021619A1 PCT/CN2013/081477 CN2013081477W WO2015021619A1 WO 2015021619 A1 WO2015021619 A1 WO 2015021619A1 CN 2013081477 W CN2013081477 W CN 2013081477W WO 2015021619 A1 WO2015021619 A1 WO 2015021619A1
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WIPO (PCT)
Prior art keywords
electrode
sensing electrode
scanning
capacitive touch
units
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Ceased
Application number
PCT/CN2013/081477
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English (en)
French (fr)
Inventor
邱杰
林永伦
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US14/111,173 priority Critical patent/US9626047B2/en
Publication of WO2015021619A1 publication Critical patent/WO2015021619A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
    • 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
    • G06F3/0448—Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
    • 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
    • G06F3/0412—Digitisers structurally integrated in a display

Definitions

  • the present invention relates to the field of touch technologies, and in particular, to a capacitive touch unit and a capacitive touch screen including the same.
  • Touch display as an input medium is currently the simplest and convenient way of human-computer interaction, and thus touch screens are increasingly applied to various electronic products.
  • touch screen products can be divided into four types: infrared touch screen, capacitive touch screen, resistive touch screen and surface acoustic wave touch screen; among them, capacitive touch screen has long life, high light transmittance and can support many Point touch and other advantages have become the mainstream touch screen technology.
  • the capacitive touch screen includes a surface capacitive type and a projected capacitive type, and the projected capacitive type can be further divided into a self-capacitance type and a mutual capacitance type.
  • the self-capacitance type is made of indium tin oxide (IT0, a transparent conductive material) on the surface of the glass to form an array of sensing electrodes and scanning electrodes. These sensing electrodes and scanning electrodes respectively form a capacitance with the ground. This capacitance is usually The self-capacitance, that is, the capacitance of the electrode to the ground.
  • the self-capacitance screen sequentially detects the sensing electrode and the scanning electrode array, and determines the coordinates of the sensing electrode and the scanning electrode array according to the change of the capacitance before and after the touch, and then combines the coordinates into a plane.
  • the self-capacitance scanning method is equivalent to projecting the touch points on the touch screen to the X-axis and the x-axis directions, respectively, and then calculating the coordinates in the X-axis and the x-axis directions, respectively, and finally combining the coordinates of the touch points.
  • the principle of mutual capacitance touch screen is shown in Figure 1.
  • the mutual capacitance screen is also used to make the sensing electrode Rx and the scanning electrode ⁇ on the glass surface.
  • the coupling capacitor C will be formed where the two sets of electrodes intersect. M , that is, the two sets of electrodes respectively constitute the two poles of the coupling capacitor C M .
  • M that is, the two sets of electrodes respectively constitute the two poles of the coupling capacitor C M .
  • the sensing electrode emits an excitation signal, and all the scanning electrodes receive the signal, so that the capacitance value of all the intersections of the sensing electrode and the scanning electrode, that is, the capacitance of the two-dimensional plane of the entire touch screen can be obtained.
  • the touch screen two-dimensional capacitance change The amount of data can be calculated, and the coordinates of each touch point can be calculated. Therefore, even if there are multiple touch points on the screen, the true coordinates of each touch point can be calculated.
  • One of the existing mutual-capacitive touch screens is that the sensing electrode Rx and the scanning electrode Tx are respectively made of two layers of bismuth conductive material, and are disposed on two parallel surfaces that are not coplanar, which is called a double-layer ⁇ mutual capacitive touch screen.
  • a double-layer ⁇ mutual capacitive touch screen that is, Doubie Layer lTO touch screen, referred to as DITO
  • the touch screen production process is complex, the production yield is restricted by the production process; and the other is a single layer ITO mutual capacitance type in which the sensing electrode Rx and the scanning electrode Tx are arranged on the same plane.
  • SITO Single Layer ITO touch screen
  • the array of sensing electrodes Rx and scanning electrodes Tx are arranged perpendicular to each other, and the shapes of the two electrodes are different, so that the sensing electrodes Rx and the scanning electrodes
  • the Tx array has a poor visual appearance, and the user can see the outline of the electrode and does not meet the requirements of the touch screen.
  • a capacitive touch unit includes: a sensing electrode connected to the control unit through the sensing electrode lead; and a plurality of scans arranged on both sides of the sensing electrode
  • the scan electrode is connected to the control unit through the scan electrode lead; and the scan electrode is located in the same plane as the sense electrode; wherein the sensing electrode includes a plurality of identical sensing electrode units, and the plurality of The sensing electrode units are regularly arranged in the same direction, and the plurality of sensing electrode units are electrically connected to each other; each of the scanning electrodes includes a plurality of identical scanning electrode units, the plurality of scanning electrode units are regularly arranged in the same direction, and the sensing The arrangement direction of the electrode units is the same, and the plurality of scanning electrode units are electrically connected to each other.
  • the spacing between two adjacent sensing electrode units is less than 129 ⁇ , the spacing between two adjacent scanning electrode units is less than 129 ⁇ , and the spacing between adjacent sensing electrode units and scanning electrode units is less than 129 ⁇ m.
  • the sensing electrode unit and the scanning electrode unit are both linear or wavy or square mesh elongated structures.
  • the first end of the scan electrode is embedded in the sensing electrode, and a gap is formed between the scan electrode and the sensing electrode.
  • the end of the first end of the scan electrode extends along both sides.
  • the sensing electrode unit and the scanning electrode unit are both transparent conductive materials. Wherein, the transparent conductive material is ⁇ .
  • the scan electrode lead is connected to the second end of the scan electrode and then connected to the control unit; wherein a filler metal is further disposed on both sides of the sensing electrode.
  • the filler metal is a transparent conductive material
  • the transparent conductive material is ⁇ .
  • the present invention divides the sensing electrode and the scanning electrode into a plurality of sensing electrode units and scanning electrode units having the same shape, respectively, and the sensing electrode unit and the scanning electrode unit have the same arrangement direction on the same plane, thereby reducing the human eye. For the purpose of detection, the problem of visual difference between the sensing electrode and the scanning electrode array is solved.
  • FIG. 1 is a schematic diagram of the principle of a mutual capacitance type touch screen.
  • FIG. 2 is a schematic structural diagram of a capacitive touch screen according to an embodiment of the present invention.
  • 3 is a schematic structural view of a touch structure layer in the capacitive touch screen shown in FIG. 2.
  • FIG. 4 is a schematic structural diagram of a capacitive touch unit according to an embodiment of the invention.
  • an object of the present invention is to provide a capacitive touch unit capable of effectively reducing human eye perception and a capacitive touch screen including the same.
  • the capacitive touch unit includes: An electrode connected to the control unit through the sensing electrode lead; and a plurality of scan electrodes arranged on both sides of the sensing electrode; the scan electrode being connected to the control unit through the scan electrode lead; and the scan electrode and the sensing
  • the sensing electrodes comprise a plurality of identical sensing electrode units, the plurality of sensing electrode units are regularly arranged in the same direction, and the plurality of sensing electrode units are electrically connected to each other; each scanning electrode A plurality of identical scan electrode units are arranged, the plurality of scan electrode units are regularly arranged in the same direction, and are arranged in the same direction as the arrangement of the sensing electrode units, and the plurality of scan electrode units are electrically connected to each other.
  • the sensing electrode and the scanning electrode are respectively divided into a plurality of sensing electrode units and scanning electrode units having the same shape, and the sensing electrode unit and the scanning electrode unit have the same alignment direction on the same plane.
  • the capacitive touch screen provided in this embodiment includes a pixel array substrate 3 , a touch screen substrate 1 disposed opposite to the pixel array substrate 3 , and the pixel array substrate 3 and the touch screen substrate 1 .
  • the touch panel substrate 1 includes a touch structure layer 1a.
  • the touch structure layer 1a includes a plurality of capacitive touch units 10 arranged in parallel (as shown in FIG. 3). .
  • the capacitive touch unit 10 has the following structure. Referring to FIG. 4, the capacitive touch unit 10 includes: a sensing electrode 200 connected to the control unit through the sensing electrode lead 2003 (not shown in the drawing); a plurality of scan electrodes 300 arranged on both sides of the sensing electrode 200. This embodiment is described by arranging two scan electrodes 300 on each side as an example; the scan electrodes 300 are connected to the control unit through scan electrode leads 3003. The scanning electrode 300 and the sensing electrode 200 are located in the same plane.
  • the sensing electrode 200 includes a plurality of identical sensing electrode units 2001, and the plurality of sensing electrode units 2001 are regularly arranged in the same direction.
  • the plurality of sensing electrode units 2001 are electrically connected to each other through the first lead 2002;
  • each of the scanning electrodes 300 includes a plurality of identical scanning electrode units 3001, the plurality of scanning electrode units 3001 are regularly arranged in the same direction, and inductively
  • the arrangement direction of the electrode units 2001 is the same, and the plurality of scan electrode units 3001 are electrically connected to each other by the second lead 3002. Connectivity.
  • the sensing electrode unit 2001 and the scanning electrode unit 3001 are both transparent conductive materials; the transparent conductive material is ⁇ .
  • the sensing electrode unit 2001 and the scanning electrode unit 3001 are both linear elongated structures; of course, in other embodiments, the sensing electrode unit 2001 and the scanning electrode unit The 3001 may also be a wavy or square mesh elongated structure.
  • the spacing between two adjacent sensing electrode units 2001 is less than 129 ⁇
  • the spacing between two adjacent scanning electrode units 3001 is less than 129 ⁇ , between the adjacent sensing electrode unit 2001 and the scanning electrode unit 3001.
  • the pitch is less than 129 ⁇ m 0 to select the spacing between the electrode units, necessary to consider the resolution limit of the human eye observation angle, and distance of the human eye.
  • the resolution limit angle of the human eye is ⁇ , but the Retina retina that appears on the market currently shows that the resolution limit angle of the human eye is 0. 59 ', which means that the display should develop toward a higher resolution.
  • L is the distance between the human eye and the touch interface
  • ⁇ is the resolution limit angle of the human eye
  • the distance between the human eye and the touch interface may be estimated according to the application object of the touch screen, thereby determining the spacing d of different electrode units.
  • the sensing electrode 200 and the scanning electrode 300 are respectively divided into a plurality of sensing electrode units 2001 and scanning electrode units 3001 having a linear elongated structure, and the sensing electrode units 2001 and the scanning electrode units
  • the 3001 has the same alignment direction on the same plane, and at the same time, by controlling the spacing d between the electrode units, the purpose of reducing the human eye is achieved, and the problem of visual difference between the sensing electrode and the scanning electrode array is solved.
  • the first end 300a of the scan electrode 300 is embedded in the sensing electrode 200, and the scanning electrode 300 has a gap between the sensing electrode 200 and the sensing electrode 200. The ends of the first ends 300a extend along both sides.
  • the scan electrode 300 By embedding the scan electrode 300 in the sensing electrode 200, the scan electrode 300 is surrounded in the sensing electrode 200, and the end portion of the first end 300a of the scan electrode 300 is further extended along both sides, thereby increasing the scan electrode 300 and The relative area between the sensing electrodes 200 increases the mutual capacitance between the electrodes, thereby reducing the influence of the noise signal and improving the signal-to-noise ratio (SNR) of the touch signal.
  • the scan electrode lead 3003 is connected to the second end of the scan electrode 300.
  • a filler metal 100 is further disposed for filling a gap region between the sensing electrode 200 and the scan electrode lead 3003 And capable of functioning as a shielding protective layer of the sensing electrode 200; wherein the filling metal 100 comprises a plurality of filling metal units of a linear elongated structure, and adjacent sensing electrodes between two adjacent filling metal units The spacing between the cell 2001 and the filler metal unit and between the scan electrode lead 3003 and the filler metal unit is less than 129 ⁇ m; the filler metal 100 is a transparent conductive material, and the transparent conductive material is ⁇ 0.
  • the present invention divides the sensing electrode and the scanning electrode into a plurality of sensing electrode units and scanning electrode units having the same shape, respectively, and the sensing electrode unit and the scanning electrode unit have the same arrangement direction on the same plane, thereby reducing the number of people.
  • the purpose of the eye detection solves the problem of visual difference between the sensing electrode and the scanning electrode array.
  • the invention also inserts the scanning electrode in the sensing electrode, so that the scanning electrode is surrounded by the sensing electrode, and the mutual capacitance between the two electrodes is increased.
  • the capacity increases the signal-to-noise ratio (SNR) of the touch signal.
  • the terms “including”, “comprising” or “comprising” or “comprising” or “comprising” are intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that includes a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device.
  • An element defined by the phrase “comprising a " does not exclude the presence of additional elements in the process, method, item, or device that comprises the element.

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  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Human Computer Interaction (AREA)
  • Crystallography & Structural Chemistry (AREA)
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Abstract

本发明公开了一种电容触控单元，包括：一感应电极，以及多个排列于所述感应电极两侧的扫描电极，所述扫描电极与所述感应电极位于同一平面内；其中，所述感应电极包括多个相同的感应电极单元，所述多个感应电极单元沿同一方向规则排列，所述多个感应电极单元相互电性连通；每一扫描电极包括多个相同的扫描电极单元，所述多个扫描电极单元沿同一方向规则排列，并且与感应电极单元的排列方向相同，所述多个扫描电极单元相互电性连通；本发明还提供了一种包括前述电容触控单元的电容式触摸屏。本发明解决了感应电极和扫描电极阵列之间存在视觉差的问题，达到降低人眼察觉的目的。

Description

电容触控单元及电容式触摸屏 技术领域 本发明涉及触控技术领域，尤其涉及一种电容触控单元以及包括该电容触 控单元的电容式触摸屏。 背景技术 触摸显示屏作为一种输入媒介，是目前最简单、 方便的一种人机交互方式， 因此触摸显示屏越来越多地应用到各种电子产品中。 基于不同的工作原理以及 传输信息的介质， 触摸屏产品可以分为四种： 红外线触摸屏、 电容式触摸屏、 电阻触摸屏和表面声波触摸屏； 其中电容式触摸屏由于具有寿命长、 透光率高、 可以支持多点触控等优点成为目前主流的触摸屏技术。 电容式触摸屏包括表面电容式和投射电容式， 其中投射电容式又可以分为 自电容式和互电容式。 自电容式是在玻璃表面用氧化铟锡（Indium tin oxide, IT0，一种透明的导电材料）制作成感应电极与扫描电极阵列， 这些感应电 极和扫描电极分别与地构成电容， 这个电容就是通常所说的自电容， 也就是电 极对地的电容。 当手指触摸到电容屏时， 手指的电容将会叠加到屏体电容上， 使屏体电容量增加。 在触摸检测时， 自电容屏依次分别检测感应电极与扫描电 极阵列， 根据触摸前后电容的变化， 分别确定感应电极与扫描电极阵列的坐标， 然后组合成平面的触摸坐标。 自电容的扫描方式， 相当于把触摸屏上的触摸点 分别投影到 X轴和 Υ轴方向， 然后分别在 X轴和 Υ轴方向计算出坐标， 最后组 合成触摸点的坐标。 互电容式触摸屏的原理如图 1所示， 互电容屏也是在玻璃 表面用制作感应电极 Rx与扫描电极 Τχ， 它与自电容屏的区别在于， 两组电极交 叉的地方将会形成耦合电容 CM， 即这两组电极分别构成了耦合电容 CM的两极。 当手指触摸到电容屏时， 影响了触摸点附近两个电极之间的耦合， 从而改变了 这两个电极之间的耦合电容 CM的大小。 检测互电容大小时， 感应电极发出激励 信号， 所有扫描电极接收信号， 这样可以得到所有感应电极与扫描电极交汇点 的电容值大小， 即整个触摸屏的二维平面的电容大小。 根据触摸屏二维电容变 化量数据， 可以计算出每一个触摸点的坐标， 因此， 屏上即使有多个触摸点， 也能计算出每个触摸点的真实坐标。
现有的互容式触摸屏中， 一种是将感应电极 Rx和扫描电极 Tx分别用两层 ΙΤΟ导电材料层制作， 设置在不共面的两平行面上，称为双层 ΙΤΟ互容式触摸屏， 即 Doubie Layer lTO触摸屏， 简称 DITO, 这种触摸屏生产工艺复杂， 生产良率受 到生产工艺的制约； 还有一种是将感应电极 Rx和扫描电极 Tx设置在同一平面上 的单层 ITO互容式触摸屏， SP Single Layer ITO触摸屏， 简称 SITO, 现有技术中的 SITO, 一般是感应电极 Rx和扫描电极 Tx阵列呈相互垂直的排列， 并且两种电极 的形状不相同， 使得感应电极 Rx和扫描电极 Tx阵列存在视觉差， 使用者能够看 到电极的轮廓， 不符合触摸屏的要求。 发明内容 鉴于现有技术存在的不足， 本发明提供了一种降低人眼察觉的电容触控单 元。 为了实现上述目的， 本发明采用了如下的技术方案： 一种电容触控单元， 包括： 一感应电极， 通过感应电极引线与控制单元连接； 以及， 多个排列于所述 感应电极两侧的扫描电极； 所述扫描电极通过扫描电极引线与控制单元连接； 并且， 所述扫描电极与所述感应电极位于同一平面内； 其中， 所述感应电极包括多个相同的感应电极单元， 所述多个感应电极单 元沿同一方向规则排列， 所述多个感应电极单元相互电性连通； 每一扫描电极 包括多个相同的扫描电极单元， 所述多个扫描电极单元沿同一方向规则排列， 并且与感应电极单元的排列方向相同， 所述多个扫描电极单元相互电性连通。 其中， 两个相邻感应电极单元的间距小于 129 μ πι, 两个相邻扫描电极单元 的间距小于 129 μ πι， 相邻的感应电极单元与扫描电极单元之间的间距小于 129 μ m。 其中， 所述感应电极单元和所述扫描电极单元均为直线状或波浪状或方格 网状长条形结构。 其中， 所述扫描电极的第一端镶嵌在所述感应电极中， 所述扫描电极与所 述感应电极之间具有间隙。 其中， 所述扫描电极的第一端的端部沿两侧边延伸。 其中， 所述感应电极单元和所述扫描电极单元均为透明导电材料。 其中， 所述透明导电材料为 ιτο。 其中， 所述扫描电极引线连接于所述扫描电极的第二端，再连接到所述控制 单元； 其中， 在所述感应电极的两侧还设置有填充金属。 其中， 所述填充金属为透明导电材料， 所述透明导电材料为 ιτο。 本发明的另一方面是提供一种电容式触摸屏， 该触摸屏包括像素阵列基板、 与像素阵列基板相对设置的触控屏基板以及设置于所述像素阵列基板和所述触 控屏基板之间的液晶层， 其中， 所述触控屏基板包括一触控结构层， 所述触控 结构层中包括多个如上所述的电容触控单元。 相比于现有技术， 本发明具有如下的优势：
( 1 )、 本发明将感应电极和扫描电极分别分成多个具有相同形状的感应电极 单元和扫描电极单元， 并且感应电极单元和扫描电极单元在同一平面上具有相 同的排列方向， 达到降低人眼察觉的目的， 解决了感应电极和扫描电极阵列之 间存在视觉差的问题。
(2)、 本发明的扫描电极镶嵌在感应电极中， 使得扫描电极被感应电极包 围， 增加了两电极间互电容的容量， 提高了触控信号的信噪比 （SNR)。 附图说明 图 1是互电容式触摸屏的原理的示意图。 图 2是本发明一实施例提供的电容式触摸屏的结构示意图。 图 3是如图 2所示的电容式触摸屏中的触摸结构层的结构示意图。 图 4是本发明一实施例提供的电容触控单元的结构示意图。 图 5是电极单元之间的间距 d与人眼和触控界面距离 L的关系示意图。 具体实施方式 如前所述， 本发明的目的是提供一种能够有效地降低人眼察觉的电容触控 单元以及包含该电容触控单元的电容式触摸屏。 该电容触控单元包括： 一感应 电极， 通过感应电极引线与控制单元连接； 以及， 多个排列于所述感应电极两 侧的扫描电极； 所述扫描电极通过扫描电极引线与控制单元连接； 并且， 所述 扫描电极与所述感应电极位于同一平面内； 其中， 所述感应电极包括多个相同 的感应电极单元， 所述多个感应电极单元沿同一方向规则排列， 所述多个感应 电极单元相互电性连通； 每一扫描电极包括多个相同的扫描电极单元， 所述多 个扫描电极单元沿同一方向规则排列， 并且与感应电极单元的排列方向相同， 所述多个扫描电极单元相互电性连通。 在如上所述的电容触控单元中， 感应电极和扫描电极分别被分成多个具有 相同形状的感应电极单元和扫描电极单元， 并且感应电极单元和扫描电极单元 在同一平面上具有相同的排列方向， 达到降低人眼察觉的目的， 解决了感应电 极和扫描电极阵列之间存在视觉差的问题。 下面将对结合附图用实施例对本发明做进一歩说明。 如图 2所示， 本实施例提供的电容式触摸屏包括像素阵列基板 3、与像素阵 列基板 3相对设置的触控屏基板 1以及设置于所述像素阵列基板 3和所述触控 屏基板 1之间的液晶层 2， 其中， 所述触控屏基板 1包括一触控结构层 la， 所 述触控结构层 la中包括多个并行排列的电容触控单元 10 (如图 3所示）。 其中， 所述电容触控单元 10具有如下的结构， 参阅图 4， 该电容触控单元 10包括： 一感应电极 200， 通过感应电极引线 2003与控制单元连接 （附图中未 标示出）； 以及， 多个排列于所述感应电极 200两侧的扫描电极 300， 本实施例 是以每侧排列两个扫描电极 300作为例子进行说明的； 所述扫描电极 300通过 扫描电极引线 3003与控制单元连接； 并且， 所述扫描电极 300与所述感应电极 200位于同一平面内； 其中， 所述感应电极 200包括多个相同的感应电极单元 2001， 所述多个感 应电极单元 2001沿同一方向规则排列， 所述多个感应电极单元 2001通过第一 引线 2002相互电性连通； 每一个扫描电极 300包括多个相同的扫描电极单元 3001， 所述多个扫描电极单元 3001沿同一方向规则排列， 并且与感应电极单元 2001的排列方向相同， 所述多个扫描电极单元 3001通过第二引线 3002相互电 性连通。 在本实施例中， 所述感应电极单元 2001和所述扫描电极单元 3001均为透 明导电材料； 所述透明导电材料为 ιτο。 在本实施例中， 所述感应电极单元 2001和所述扫描电极单元 3001均为直 线状长条形结构； 当然， 在另外的一些实施例中， 所述感应电极单元 2001和所 述扫描电极单元 3001也可以是波浪状或方格网状长条形结构。 在本实施例中， 两个相邻感应电极单元 2001的间距小于 129 μ πι， 两个相邻 扫描电极单元 3001的间距小于 129 μ πι， 相邻的感应电极单元 2001与扫描电极 单元 3001之间的间距小于 129 μ m0 对于电极单元之间的间距的选择， 需要综合考虑人眼分辨率极限角以及人 眼的观察距离。 显示技术领域认为人眼分辨率极限角为 Γ ，但是目前市面上出 现的 Retina视网膜显示， 认为人眼分辨率极限角为 0. 59 ' ，这意味着显示屏应 朝更高分辨率方向发展。 如图 5所示， L为人眼与触控界面距离， Θ为人眼分辨 率极限角， d为相邻电极单元的间距， 其中 d L X Θ； 在本实施例中， 人眼 与触控界面距离为 75cm (按照成人之一般手臂长度估算）， Θ =0. 59， =0. 000172 弧度， 则： d^L X Θ =75cm X 10000 X 0. 000172=129 μ m0 需要说明的是， 本实施例选择 d=129 m仅仅是举例说明， 在另外的一些实 施例中， 可以根据触摸屏的应用对象， 估算人眼与触控界面距离， 从而确定不 同的电极单元的间距 d。 在如上所述的电容触控单元中， 感应电极 200和扫描电极 300分别被分成 多个具有直线状长条形结构的感应电极单元 2001和扫描电极单元 3001，并且感 应电极单元 2001和扫描电极单元 3001在同一平面上具有相同的排列方向， 同 时通过控制电极单元之间的间距 d，达到降低人眼察觉的目的， 解决了感应电极 和扫描电极阵列之间存在视觉差的问题。 在本实施例中， 所述扫描电极 300的第一端 300a镶嵌在所述感应电极 200 中， 所述扫描电极 300与所述感应电极 200之间具有间隙； 进一歩地， 所述扫 描电极 300的第一端 300a的端部沿两侧边延伸。 通过将扫描电极 300镶嵌在感 应电极 200中， 使感应电极 200中包围扫描电极 300， 并且进一歩的将扫描电极 300的第一端 300a的端部沿两侧边延伸， 增加了扫描电极 300与感应电极 200 之间的相对面积， 增大了两电极间互电容， 从而降低了噪声信号的影响， 提高 了触控信号的信噪比 （SNR)。 在本实施例中， 所述扫描电极引线 3003连接于所述扫描电极 300的第二端 300b，再连接到所述控制单元； 其中， 在所述感应电极 200的两侧还设置有填充 金属 100， 用于填充所述所述感应电极 200与所述扫描电极引线 3003之间的空 隙区域，并且能够作为所述感应电极 200的屏蔽保护层；其中，所述填充金属 100 包括多个直线状长条形结构的填充金属单元， 两个相邻填充金属单元之间、 相 邻的感应电极单元 2001与填充金属单元之间以及所述扫描电极引线 3003与填 充金属单元之间的间距均小于 129 μ πι; 所述填充金属 100为透明导电材料， 所 述透明导电材料为 ΙΤ0。 通过在所述感应电极 200与所述扫描电极引线 3003之 间设置填充金属 100， 屏蔽了扫描电极引线 3003中的信号对所述感应电极 200 的干扰， 进一歩提高了触控信号的信噪比 （SNR)。 综上所述， 本发明将感应电极和扫描电极分别分成多个具有相同形状的感应 电极单元和扫描电极单元， 并且感应电极单元和扫描电极单元在同一平面上具 有相同的排列方向， 达到降低人眼察觉的目的， 解决了感应电极和扫描电极阵 列之间存在视觉差的问题； 同时， 本发明还将扫描电极镶嵌在感应电极中， 使 得扫描电极被感应电极包围， 增加了两电极间互电容的容量， 提高了触控信号 的信噪比 （SNR)。 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

权 利 要 求 书
1、 一种电容触控单元， 其中， 包括： 一感应电极， 通过感应电极引线与控制单元连接； 以及， 多个排列于所述 感应电极两侧的扫描电极； 所述扫描电极通过扫描电极引线与控制单元连接； 并且， 所述扫描电极与所述感应电极位于同一平面内； 其中， 所述感应电极包括多个相同的感应电极单元， 所述多个感应电极单 元沿同一方向规则排列， 所述多个感应电极单元相互电性连通； 每一扫描电极 包括多个相同的扫描电极单元， 所述多个扫描电极单元沿同一方向规则排列， 并且与感应电极单元的排列方向相同， 所述多个扫描电极单元相互电性连通。
2、 根据权利要求 1所述的电容触控单元， 其中， 两个相邻感应电极单元的 间距小于 129 μ πι， 两个相邻扫描电极单元的间距小于 129 μ πι, 相邻的感应电极 单元与扫描电极单元之间的间距小于 129 μ πι。
3、 根据权利要求 1所述的电容触控单元， 其中， 所述感应电极单元和所述 扫描电极单元均为直线状或波浪状或方格网状长条形结构。
4、 根据权利要求 1所述的电容触控单元， 其中， 所述扫描电极的第一端镶 嵌在所述感应电极中， 所述扫描电极与所述感应电极之间具有间隙。
5、 根据权利要求 4所述的电容触控单元， 其中， 所述扫描电极的第一端的 端部沿两侧边延伸。
6、 根据权利要求 1所述的电容触控单元， 其中， 所述感应电极单元和所述 扫描电极单元均为透明导电材料。
7、 根据权利要求 6所述的电容触控单元， 其中， 所述透明导电材料为 IT0。
8、 根据权利要求 1所述的电容触控单元， 其中， 所述扫描电极引线连接于 所述扫描电极的第二端，再连接到所述控制单元； 其中， 在所述感应电极的两侧 还设置有填充金属。
9、 根据权利要求 8所述的电容触控单元， 其中， 所述填充金属为透明导电 材料， 所述透明导电材料为 ιτο。
10、 根据权利要求 4所述的电容触控单元， 其中， 所述扫描电极引线连接 于所述扫描电极的第二端，再连接到所述控制单元； 其中， 在所述感应电极的两 侧还设置有填充金属。
11、 根据权利要求 10所述的电容触控单元， 其中， 所述填充金属为透明导 电材料， 所述透明导电材料为 ιτο。
12、 一种电容式触摸屏， 包括像素阵列基板、 与像素阵列基板相对设置的 触控屏基板以及设置于所述像素阵列基板和所述触控屏基板之间的液晶层， 其 中， 所述触控屏基板包括一触控结构层， 所述触控结构层中包括多个电容触控 单元， 所述电容触控单元包括： 一感应电极， 通过感应电极引线与控制单元连接； 以及， 多个排列于所述 感应电极两侧的扫描电极； 所述扫描电极通过扫描电极引线与控制单元连接； 并且， 所述扫描电极与所述感应电极位于同一平面内； 其中， 所述感应电极包括多个相同的感应电极单元， 所述多个感应电极单 元沿同一方向规则排列， 所述多个感应电极单元相互电性连通； 每一扫描电极 包括多个相同的扫描电极单元， 所述多个扫描电极单元沿同一方向规则排列， 并且与感应电极单元的排列方向相同， 所述多个扫描电极单元相互电性连通。
13、 根据权利要求 12所述的电容式触摸屏， 其中， 两个相邻感应电极单元 的间距小于 129 μ πι， 两个相邻扫描电极单元的间距小于 129 μ πι, 相邻的感应电 极单元与扫描电极单元之间的间距小于 129 μ πι。
14、 根据权利要求 12所述的电容式触摸屏， 其中， 所述感应电极单元和所 述扫描电极单元均为直线状或波浪状或方格网状长条形结构。
15、 根据权利要求 12所述的电容式触摸屏， 其中， 所述扫描电极的第一端 镶嵌在所述感应电极中， 所述扫描电极与所述感应电极之间具有间隙。
16、 根据权利要求 15所述的电容式触摸屏， 其中， 所述扫描电极的第一端 的端部沿两侧边延伸。
17、 根据权利要求 12所述的电容式触摸屏， 其中， 所述感应电极单元和所 述扫描电极单元均为透明导电材料，所述透明导电材料为 ιτο。
18、 根据权利要求 12所述的电容式触摸屏， 其中， 所述扫描电极引线连接 于所述扫描电极的第二端，再连接到所述控制单元； 其中， 在所述感应电极的两 侧还设置有填充金属；所述填充金属为透明导电材料，所述透明导电材料为 ιτο。
19、 根据权利要求 15所述的电容式触摸屏， 其中， 所述扫描电极引线连接 于所述扫描电极的第二端，再连接到所述控制单元； 其中， 在所述感应电极的两 侧还设置有填充金属；所述填充金属为透明导电材料，所述透明导电材料为 IT0。
PCT/CN2013/081477 2013-08-13 2013-08-14 电容触控单元及电容式触摸屏 Ceased WO2015021619A1 (zh)

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