WO2016045244A1 - 触控面板及触控点的确定方法、显示装置 - Google Patents

触控面板及触控点的确定方法、显示装置 Download PDF

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WO2016045244A1
WO2016045244A1 PCT/CN2015/070110 CN2015070110W WO2016045244A1 WO 2016045244 A1 WO2016045244 A1 WO 2016045244A1 CN 2015070110 W CN2015070110 W CN 2015070110W WO 2016045244 A1 WO2016045244 A1 WO 2016045244A1
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Prior art keywords
voltage signal
voltage
signal terminal
signal end
touch point
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PCT/CN2015/070110
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English (en)
French (fr)
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刘晓龙
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京东方科技集团股份有限公司
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Priority to EP15753300.1A priority Critical patent/EP3200055B1/en
Priority to US14/771,656 priority patent/US9632620B2/en
Publication of WO2016045244A1 publication Critical patent/WO2016045244A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F2203/04113—Peripheral electrode pattern in resistive digitisers, i.e. electrodes at the periphery of the resistive sheet are shaped in patterns enhancing linearity of induced field

Definitions

  • the present invention belongs to the field of display technologies, and in particular, to a touch panel and a method for determining a touch point, and a display device.
  • the structure of the four-wire resistive touch panel is as shown in FIG. 1 , and the glass substrate is covered with two layers of indium tin oxide (ITO) transparent conductive layers (ie, the first transparent conductive layer 1 and the second transparent conductive layer 2).
  • ITO indium tin oxide
  • a two-layer ITO transparent conductive layer is covered with a PET film, wherein two ITO transparent conductive layers are separated from each other, and the lower ITO transparent conductive layer is attached to the glass substrate.
  • the upper ITO transparent conductive layer is attached to the PET film.
  • the positive and negative ends of the X electrode and the positive and negative ends of the Y electrode are respectively led out from the both ends of the X electrode and the both ends of the Y electrode by the "conductive strip” (the black strip portion in the figure), and the conductive strip and Y of the X electrode
  • the conductive strips of the electrodes are perpendicular to each other, wherein the positive and negative ends of the X electrodes include a first voltage signal terminal X+ and a second voltage signal terminal X-, and the positive and negative terminals of the Y electrode include a third voltage signal terminal Y+ and a fourth voltage signal terminal Y-, a total of four terminals, this is the origin of the name of the four-wire resistive touch panel.
  • the inventors have found that at least the following problems exist in the prior art: as can be seen from the equivalent circuit diagram (Fig. 2 and Fig. 3), when calculating the X coordinate of the touch point, the first voltage signal terminal X+ is measured as the lead end. In the case where the voltage Vx of the touch point and the Y coordinate of the touch point are calculated, the third voltage signal terminal Y+ is used as the terminal to measure the voltage Vy of the touch point. In the case where the size of the touch panel is large, the resistance of each resistor is large, so the error of the measured voltage Vx of the touch point and the voltage Vy of the touch point will be large, resulting in a calculated touch. The position (coordinates) of the handle is not accurate enough, and the sensitivity of the touch panel is low.
  • the technical problem to be solved by the present invention is to provide a touch panel with high touch sensitivity, a method for determining a touch point, and a display device, which are related to the above problems in the prior art.
  • the technical solution adopted to solve the technical problem to be solved by the present invention is a touch panel, comprising: a first transparent conductive layer and a second transparent conductive layer disposed at a relatively spaced interval, wherein the first transparent conductive layer is provided with a first voltage a signal end and a second voltage signal end opposite to the first voltage signal end, the second transparent conductive layer is provided with a third voltage signal end and a fourth voltage signal end opposite to the third voltage signal end, the first voltage signal The extension end direction is perpendicular to the extending direction of the third voltage signal end, and the second signal voltage port is short-circuited with the fourth voltage signal end, the touch panel further includes a voltage output unit, a reading unit, and a calculating unit, wherein the voltage output unit is configured to alternately input a driving voltage to the first voltage signal end and the third voltage signal end according to the control signal, and input the shorted second voltage signal end and the fourth voltage signal end a low voltage; the reading unit is configured to read a voltage value of the third voltage signal end when
  • the touch panel may further include a control unit for generating a control signal to control a voltage output of the voltage output unit.
  • the voltage output unit may input a low voltage with a voltage value of 0V to the second voltage signal terminal and the fourth voltage signal terminal that are shorted together.
  • the calculating unit may calculate the value of the coordinates (X, Y) of the touch point according to the following formula:
  • R1 is a resistance between the touch point and the first voltage signal end
  • R2 is a resistance between the touch point and the second voltage signal end
  • R3 is a resistance between the touch point and the third voltage signal end
  • R4 is the resistance between the touch point and the fourth voltage signal terminal
  • R 1 + R 2 R X
  • R 3 + R 4 R Y
  • a is the vertical distance between the third voltage signal end and the fourth voltage signal end on the touch panel
  • b is the vertical distance between the first voltage signal end and the second voltage signal end on the touch panel
  • Vx is read The voltage value of the first voltage signal terminal
  • Vy is the voltage value of the third voltage signal terminal that is read.
  • Another technical solution for solving the technical problem to be solved by the present invention is a method for determining a touch point of a touch panel, wherein the touch panel is the touch panel described above, and the method includes the steps of: alternately Inputting a driving voltage to the first voltage signal terminal and the third voltage signal terminal, and simultaneously inputting a low voltage to the second voltage signal terminal and the fourth voltage signal terminal that are shorted together; when the driving voltage is input to the first voltage signal terminal Reading the voltage value of the third voltage signal end, reading the voltage value of the first voltage signal end when inputting the driving voltage to the third voltage signal end; reading the first voltage according to the read voltage value of the third voltage signal end The voltage value at the signal end calculates the value of the coordinates of the touch point.
  • the step of alternately inputting a driving voltage to the first voltage signal terminal and the third voltage signal terminal, and simultaneously inputting the second voltage signal terminal and the fourth voltage signal terminal that are shorted together may include: at the control signal Under the control, the first voltage signal terminal and the third voltage signal terminal are alternately input with the driving voltage, and at the same time, the shorted second voltage signal terminal and the fourth voltage signal terminal are input with a low voltage.
  • a low voltage having a voltage value of 0 V may be input to the second voltage signal terminal and the fourth voltage signal terminal which are shorted together.
  • the value of the coordinates of the touch point can be calculated according to the following formula:
  • R1 is a resistance between the touch point and the first voltage signal end
  • R2 is a resistance between the touch point and the second voltage signal end
  • R3 is a resistance between the touch point and the third voltage signal end
  • R4 is the resistance between the touch point and the fourth voltage signal terminal
  • R 1 + R 2 R X
  • R 3 + R 4 R Y
  • a is the vertical distance between the third voltage signal end and the fourth voltage signal end on the touch panel
  • b is the vertical distance between the first voltage signal end and the second voltage signal end on the touch panel
  • Vx is read The voltage value of the first voltage signal terminal
  • Vy is the voltage value of the third voltage signal terminal that is read.
  • Still another technical solution adopted to solve the technical problem to be solved by the present invention is a display device including the above touch panel.
  • the resistance between the touch point and the low voltage signal end is connected in parallel and the resistance is reduced. , thereby improving the accuracy of the measured voltage and improving the touch sensitivity of the touch panel.
  • the touch point determining method of the touch panel of the present invention can more accurately determine the position (coordinates) of the touch point.
  • the display device of the present invention has better performance by applying the above touch panel.
  • FIG. 1 is a schematic structural view of a touch panel in the prior art.
  • FIG. 2 is an equivalent circuit diagram for calculating the X coordinate of the touch point in the case where the touch panel of FIG. 1 is touched.
  • FIG. 3 is an equivalent circuit diagram for calculating the Y coordinate of the touch point in the case where the touch panel of FIG. 1 is touched.
  • FIG. 4 is a schematic structural view of a touch panel according to Embodiment 1 of the present invention.
  • FIG. 5 is an equivalent circuit diagram for calculating the X coordinate of the touch point in the case where the touch panel of FIG. 4 is touched.
  • FIG. 6 is an equivalent circuit diagram for calculating the Y coordinate of the touch point in the case where the touch panel of FIG. 4 is touched.
  • the embodiment provides a touch panel including relative intervals.
  • a first transparent conductive layer 1 and a second transparent conductive layer 2 the first transparent conductive layer 1 is provided with a first voltage signal terminal X+ and a second voltage signal terminal X- opposite to the first voltage signal terminal X+, and a second The transparent conductive layer 2 is provided with a third voltage signal terminal Y+ and a fourth voltage signal terminal Y- opposite to the third voltage signal terminal Y+, wherein the extending direction of the first voltage signal terminal X+ is perpendicular to the third voltage signal terminal Y+ In the extending direction, the second signal voltage terminal X- is short-circuited with the fourth voltage signal terminal Y-.
  • the touch panel further includes a voltage output unit, a reading unit, and a calculating unit, wherein the voltage output unit is configured to alternately input a driving voltage to the first voltage signal terminal X+ and the third voltage signal terminal Y+ according to the control signal, and Inputting a low voltage to the second voltage signal terminal X- and the fourth voltage signal terminal Y- shorted together, the reading unit for reading the third voltage signal when inputting the driving voltage to the first voltage signal terminal X+
  • the voltage value of the terminal Y+, the voltage value of the first voltage signal terminal X+ is read when the driving voltage is input to the third voltage signal terminal Y+, and the calculating unit is configured to use the voltage value of the third voltage signal terminal Y+ according to the reading
  • the read voltage value of the first voltage signal terminal X+ calculates the value of the coordinates of the touch point.
  • the driving voltage provided by the voltage output unit is U and the low voltage is 0V, and the resistance RT at the touch point is small and can be ignored.
  • the voltage Vx is measured as the voltage of the touch point by using the first voltage signal terminal X+ as the terminal.
  • R ⁇ is the parallel resistance of R2 and R4, ie, Therefore, the resistance of R ⁇ is smaller than the resistance of R 4 , and therefore, the error of the voltage Vx measured in the present embodiment is reduced and more accurate than the Vx measured in the prior art.
  • the voltage Vy is measured as the voltage of the touch point by using the third voltage signal terminal Y+ as the terminal. Since the resistance of R ⁇ is also smaller than the resistance of R 2 , the voltage Vy measured in this embodiment is also more accurate than the Vy measured in the prior art.
  • the resistance between the touch point and the low voltage terminal is connected in parallel to reduce the touch point and the low voltage end.
  • the equivalent resistance between the two forms a resistive touch panel that is equivalent to a small-sized resistive touch panel, and solves the problem of low sensitivity of the large-sized resistive touch panel.
  • the touch panel further includes a control unit for generating a control signal to control a voltage output of the voltage output unit.
  • the control signal generated by the control unit can control the voltage output unit to output the driving voltage to the third voltage signal terminal Y+ at the first moment, and simultaneously give the second voltage signal terminal X- and the fourth voltage signal terminal Y-
  • the low voltage is input, so that the voltage Vx of the first voltage signal terminal X+ can be measured, and the driving voltage is output to the first voltage signal terminal X+ at the second timing, and the second voltage signal terminal X- and the fourth terminal are short-circuited together.
  • the voltage signal terminal Y- inputs a low voltage, so that the voltage Vy of the third voltage signal terminal Y+ can be measured, so that the position (coordinate) of the touch point can be determined according to the measured Vx and Vy.
  • the voltage output unit inputs the second voltage signal terminal X- and the fourth voltage signal terminal Y- input that are shorted together.
  • the voltage value of the voltage is 0V.
  • the input voltage is lower than the driving voltage.
  • the voltage output unit supplies the voltages of the low voltages input to the second voltage signal terminal X- and the fourth voltage signal terminal Y- which are shorted together, the voltage value is 0V (That is, when the second voltage signal terminal X- and the fourth voltage signal terminal Y- are grounded, R1 is the resistance between the touch point and the first voltage signal terminal X+, and R2 is the touch point and the second voltage signal end.
  • the calculation unit calculates the value of the coordinates (X, Y) of the touch point according to the following formula:
  • the resistance RT of the touch point is small, it can be ignored.
  • the resistance between the touch point and the low voltage terminal is connected in parallel to reduce the touch point and The resistance between the low voltage terminals increases the accuracy of the measured voltage and the sensitivity of the touch panel.
  • the method for determining the touch point of the touch panel is the touch panel of the first embodiment.
  • the method specifically includes the steps of: alternately giving the first voltage signal terminal X+ and the third The voltage signal terminal Y+ inputs the driving voltage, and simultaneously supplies the short-connected second voltage signal terminal X- and the fourth voltage signal terminal Y- input low voltage, wherein when the driving voltage is input to the first voltage signal terminal X+, Reading the voltage value of the third voltage signal terminal Y+, and when inputting the driving voltage to the third voltage signal terminal Y+, reading the voltage value of the first voltage signal terminal X+; according to the voltage value of the read third voltage signal terminal Y+ And reading the voltage value of the first voltage signal terminal X+, and calculating the value of the coordinates of the touch point.
  • the above-mentioned alternately inputting the driving voltage to the first voltage signal terminal X+ and the third voltage signal terminal Y+, and simultaneously inputting the second voltage signal terminal X- and the fourth voltage signal terminal Y- short-connected to the low voltage
  • the step of specifically includes: alternately inputting a driving voltage to the first voltage signal terminal X+ and the third voltage signal terminal Y+ under the control of the control signal, and simultaneously giving the second voltage signal terminal X- and the fourth voltage that are shorted together Signal terminal Y- input low voltage.
  • the second voltage signal terminal X- and the fourth voltage signal terminal Y- shorted together are input with a low voltage having a voltage value of 0V.
  • the value of the coordinates of the touch point is calculated according to the following formula:
  • R1 is a resistance between the touch point and the first voltage signal end X+
  • R2 is a resistance between the touch point and the second voltage signal end X-
  • R3 is a touch point and a third voltage signal end Y+
  • R4 is the resistance between the touch point and the fourth voltage signal terminal Y-
  • R 1 + R 2 R X
  • R 3 + R 4 R Y
  • a is the vertical distance between the third voltage signal terminal Y+ and the fourth voltage signal terminal Y- on the touch panel
  • b is the vertical between the first voltage signal terminal X+ and the second voltage signal terminal X- on the touch panel
  • Vx is the voltage value of the read first voltage signal terminal X+
  • Vy is the voltage value of the read third voltage signal terminal Y+.
  • the touch panel in the present embodiment is the touch panel in the first embodiment. Therefore, the method for determining the touch point position (coordinates) of the touch panel provided in this embodiment can accurately determine the touch panel. The position (coordinate) where the touch is made.
  • the present embodiment provides a display device that includes the touch panel of the first embodiment. Therefore, the touch sensitivity of the display device of the embodiment is high.
  • the display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.

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Abstract

一种触控面板及触控点的确定方法、显示装置，其可解决现有的触控面板的灵敏度低的问题。触控面板包括：相对间隔设置的第一透明导电层（1）和第二透明导电层（2），第一透明导电层（1）上设置有第一电压信号端（X+）和与第一电压信号端（X+）相对的第二电压信号端（X-），第二透明导电层（2）上设置有第三电压信号端（Y+）和与第三电压信号端（Y+）相对的第四电压信号端（Y-），其中，第一电压信号端（X+）的延伸方向垂直于第三电压信号端（Y+）的延伸方向，第二信号电压端（X-）与第四电压信号端（Y-）短接在一起，触控面板还包括：电压输出单元、读取单元，以及计算单元。

Description

触控面板及触控点的确定方法、显示装置 技术领域
本发明属于显示技术领域，具体涉及触控面板及触控点的确定方法、显示装置。
背景技术
目前，四线电阻式触控面板的结构如图1所示，在玻璃基板上覆盖有两层氧化铟锡(ITO)透明导电层(即，第一透明导电层1和第二透明导电层2)，分别作为X电极和Y电极，在两层ITO透明导电层之上覆盖有一层PET薄膜，其中，两层ITO透明导电层之间相互隔开，下层的ITO透明导电层附着在玻璃基板上，上层的ITO透明导电层附着在PET薄膜上。X电极的正负端和Y电极的正负端都由“导电条”(图中黑色条形部分)分别从X电极的两端和Y电极的两端引出，且X电极的导电条和Y电极的导电条相互垂直，其中，X电极的正负端包括第一电压信号端X+和第二电压信号端X-，Y电极的正负端包括第三电压信号端Y+和第四电压信号端Y-，一共四个接线端，这就是四线电阻式触控面板的名称的由来。当有物体接触该触控面板表面并施加一定的压力而对该触控面板进行触控时，上层的ITO透明导电层发生形变与下层的ITO透明导电层发生接触，该结构可以等效为相应的电路，如图2和图3所示(其中，由于触控点处的电阻RT很小，故忽略不计)。
首先，计算触控点的X坐标，在第三电压信号端Y+施加驱动电压U，第四电压信号端Y-接地，第一电压信号端X+作为引出端而测量得到触控点的电压Vx，由于ITO透明导电层均匀导电，触控点的电压Vx与驱动电压U之比等于触控点的X坐标与触控面板的宽度a之比，即：Vx/U＝X/a。
然后，计算触控点的Y坐标，在第一电压信号端X+施加驱动电压U，第二电压信号端X-接地，第三电压信号端Y+作为引出端而测量得到触控点的电压Vy，由于ITO透明导电层均匀导电，触控点的电压Vy与驱动电压U之比等于触控点的Y坐标与触控面板的高度b之比，即：Vy/U＝Y/b。
计算出触控点的坐标为：
Figure PCTCN2015070110-appb-000001
发明人发现，现有技术中至少存在如下问题：从等效电路图(图2和图3)中可以看出，计算触控点的X坐标时，第一电压信号端X+作为引出端而测量得到触控点的电压Vx，以及计算触控点的Y坐标时，第三电压信号端Y+作为引出端而测量得到触控点的电压Vy，该情况下，
Figure PCTCN2015070110-appb-000002
在触控面板的尺寸较大的情况下，各电阻的阻值较大，因此测量得到的触控点的电压Vx和触控点的电压Vy的误差将会较大，从而导致计算得到的触控点的位置(坐标)不够精确、以及触控面板的灵敏度低的问题。
发明内容
本发明所要解决的技术问题是，针对现有技术中的触控面板存在的上述问题，提供一种触控灵敏度高的触控面板及触控点的确定方法、显示装置。
解决本发明所要解决的技术问题所采用的技术方案是一种触控面板，其包括：相对间隔设置的第一透明导电层和第二透明导电层，第一透明导电层上设置有第一电压信号端和与第一电压信号端相对的第二电压信号端，第二透明导电层上设置有第三电压信号端和与第三电压信号端相对的第四电压信号端，第一电压信 号端延伸方向垂直于第三电压信号端的延伸方向，所述第二信号电压端口与所述第四电压信号端短接在一起，所述触控面板还包括电压输出单元、读取单元，以及计算单元，所述电压输出单元用于根据控制信号交替地给第一电压信号端和第三电压信号端输入驱动电压、以及给短接在一起的第二电压信号端和第四电压信号端输入低电压；所述读取单元用于在给第一电压信号端输入驱动电压时，读取第三电压信号端的电压值，在给第三电压信号端输入驱动电压时，读取第一电压信号端的电压值；所述计算单元用于根据读取的第三电压信号端的电压值和读取第一电压信号端的电压值，计算触控点的坐标的值。
所述触控面板还可以包括控制单元，所述控制单元用于产生控制信号以控制所述电压输出单元的电压输出。
所述电压输出单元可以给短接在一起的第二电压信号端和第四电压信号端输入电压值为0V的低电压。
所述计算单元可以根据如下公式计算触控点的坐标(X，Y)的值：
Figure PCTCN2015070110-appb-000003
其中，R1为触控点与第一电压信号端之间的电阻，R2为触控点与第二电压信号端之间的电阻，R3为触控点与第三电压信号端之间的电阻，R4为触控点与第四电压信号端之间的电阻，R1+R2＝RX，R3+R4＝RY，
Figure PCTCN2015070110-appb-000004
a为触控面板上第三电压信号端与第四电压信号端之间的垂直距离，b为触控面板上第一电压信号端与第二电压信号端之间的垂直距离，Vx为读取的第一电压信号 端的电压值，Vy为读取的第三电压信号端的电压值。
解决本发明所要解决的技术问题所采用的另一种技术方案是一种触控面板的触控点的确定方法，所述触控面板为上述的触控面板，所述方法包括步骤：交替地给第一电压信号端和第三电压信号端输入驱动电压、以及同时给短接在一起的第二电压信号端和第四电压信号端输入低电压；在给第一电压信号端输入驱动电压时，读取第三电压信号端的电压值，在给第三电压信号端输入驱动电压时，读取第一电压信号端的电压值；根据读取的第三电压信号端的电压值和读取第一电压信号端的电压值，计算触控点的坐标的值。
所述交替地给第一电压信号端和第三电压信号端输入驱动电压、以及同时给短接在一起的第二电压信号端和第四电压信号端输入低电压的步骤可以包括：在控制信号的控制下交替地给第一电压信号端和第三电压信号端输入驱动电压、以及同时给短接在一起的第二电压信号端和第四电压信号端输入低电压。
在上述方法中，可以给短接在一起的第二电压信号端和第四电压信号端输入电压值为0V的低电压。
在上述方法中，可以根据如下公式计算触控点的坐标的值：
Figure PCTCN2015070110-appb-000005
其中，R1为触控点与第一电压信号端之间的电阻，R2为触控点与第二电压信号端之间的电阻，R3为触控点与第三电压信号端之间的电阻，R4为触控点与第四电压信号端之间的电阻，R1+R2＝RX，R3+R4＝RY，
Figure PCTCN2015070110-appb-000006
a为触控面板上第三电压信号端 与第四电压信号端之间的垂直距离，b为触控面板上第一电压信号端与第二电压信号端之间的垂直距离，Vx为读取的第一电压信号端的电压值，Vy为读取的第三电压信号端的电压值。
解决本发明所要解决的技术问题所采用的再一种技术方案是一种显示装置，其包括上述触控面板。
由于本发明的触控面板的第二电压信号端和第四电压信号端短接且同时接入低电压信号，因此，触控点与该低电压信号端之间的电阻并联而阻值减小，从而提高了所测量的电压的精确度并且提高了触控面板的触控灵敏度。
本发明的触控面板的触控点确定方法可以更加准确地确定触控点的位置(坐标)。
本发明的显示装置由于应用了上述触控面板，故其性能更好。
附图说明
图1为现有技术中的触控面板的结构示意图。
图2为在对图1的触控面板进行触控的情况下计算触控点的X坐标时的等效电路图。
图3为在对图1的触控面板进行触控的情况下计算触控点的Y坐标时的等效电路图。
图4为本发明的实施例1的触控面板的结构示意图。
图5为在对图4的触控面板进行触控的情况下计算触控点的X坐标时的等效电路图。
图6为在对图4的触控面板进行触控的情况下计算触控点的Y坐标时的等效电路图。
具体实施方式
为使本领域技术人员更好地理解本发明的技术方案，下面结合附图和具体实施方式对本发明作进一步详细描述。
[第一实施例]
如图4所示，本实施例提供一种触控面板，其包括相对间隔 设置的第一透明导电层1和第二透明导电层2，第一透明导电层1设置有第一电压信号端X+和与第一电压信号端X+相对的第二电压信号端X-，第二透明导电层2设置有第三电压信号端Y+和与第三电压信号端Y+相对的第四电压信号端Y-，其中，第一电压信号端X+的延伸方向垂直于第三电压信号端Y+的延伸方向，所述第二信号电压端X-与所述第四电压信号端Y-短接在一起。所述触控面板还包括电压输出单元、读取单元、以及计算单元，所述电压输出单元用于根据控制信号交替地给第一电压信号端X+和第三电压信号端Y+输入驱动电压、以及给短接在一起的第二电压信号端X-和第四电压信号端Y-输入低电压，所述读取单元用于在给第一电压信号端X+输入驱动电压时读取第三电压信号端Y+的电压值、在给第三电压信号端Y+输入驱动电压时读取第一电压信号端X+的电压值，所述计算单元用于根据读取的第三电压信号端Y+的电压值和读取的第一电压信号端X+的电压值计算触控点的坐标的值。
如图5和图6所示，在本实施例中，假设电压输出单元所提供的驱动电压为U、低电压为0V，触控点处的电阻RT很小，可以忽略不计。在计算触控点的X坐标时，将第一电压信号端X+作为引出端而测量得到电压Vx作为触控点的电压，
Figure PCTCN2015070110-appb-000007
其中，RΔ是R2和R4的并联电阻，即，
Figure PCTCN2015070110-appb-000008
所以RΔ的阻值小于R4的阻值，因此，相比于现有技术中测量得到的Vx，本实施例中测量得到的电压Vx的误差减小而更精确。同理，在计算触控点的Y坐标时，将第三电压信号端Y+作为引出端而测量得到电压Vy作为触控点的电压，
Figure PCTCN2015070110-appb-000009
由于RΔ的阻值也小于R2的阻值，因此，相比于现有技术中测量得到的Vy，本实施例中测量得到的电压Vy也更精确。在本实施例中，通过将第二电压信号端X-与第四电压信号端Y-短接，将触控点与低电压端之间的电阻并联，来降低触控点与低电压端之间的等效电阻，从而实现 了将大尺寸的电阻式触控面板等效成小尺寸的电阻式触控面板的技术效果，解决了大尺寸的电阻式触控面板的灵敏度低的问题。
优选地，所述触控面板还包括控制单元，其用于产生控制信号以控制所述电压输出单元的电压输出。控制单元产生的控制信号可以控制所述电压输出单元在第一时刻输出驱动电压给第三电压信号端Y+，同时给短接在一起的第二电压信号端X-与第四电压信号端Y-输入低电压，从而可以测得第一电压信号端X+的电压Vx，在第二时刻输出驱动电压给第一电压信号端X+，同时给短接在一起的第二电压信号端X-与第四电压信号端Y-输入低电压，从而可以测得第三电压信号端Y+的电压Vy，这样就可以根据测量得到的Vx和Vy确定触控点的位置(坐标)。当然，为了更好地测量以及计算触控点的坐标的值，进一步优选地，所述电压输出单元给短接在一起的第二电压信号端X-和第四电压信号端Y-输入的低电压的电压值为0V，当然，输入相对于驱动电压较低的电压即可。
结合图5、图6所示的等效电路图，当所述电压输出单元给短接在一起的第二电压信号端X-和第四电压信号端Y-输入的低电压的电压值为0V(也就是第二电压信号端X-和第四电压信号端Y-均接地)时，R1为触控点与第一电压信号端X+之间的电阻，R2为触控点与第二电压信号端X-之间的电阻，R3为触控点与第三电压信号端Y+之间的电阻，R4为触控点与第四电压信号端Y-之间的电阻，假设R1+R2＝RX，R3+R4＝RY，
Figure PCTCN2015070110-appb-000010
a为触控面板的第三电压信号端Y+与第四电压信号端Y-之间的垂直距离，b为触控面板的第一电压信号端X+与第二电压信号端X-之间的垂直距离，Vx为读取的第一电压信号端X+的电压值，Vy为读取的第三电压信号端Y+的电压值。
所述计算单元根据如下公式计算触控点的坐标(X，Y)的值：
Figure PCTCN2015070110-appb-000011
简化上述方程组，得：
Figure PCTCN2015070110-appb-000012
解得：
Figure PCTCN2015070110-appb-000013
由于(U-Vy)＞0且(VxVy-U2)＜0，因此上式分母小于0，又由于R1＞0，则要求上式分子也小于0，显然，可以确定R1的唯一解：
Figure PCTCN2015070110-appb-000014
解上述方程可以得到触控点的坐标(X，Y)的值为：
Figure PCTCN2015070110-appb-000015
在本实施例中，由于触控点的电阻RT很小，故可以忽略不 计，在此基础上，主要是通过将第二电压信号端X-和第四电压信号端Y-短接，来将触控点与低电压端之间的电阻并联而减小触控点与低电压端之间的电阻，从而提高测量电压的准确度以及触控面板的灵敏度。
[第二实施例]
本实施例提供一种触控面板的触控点的确定方法，该触控面板为上述第一实施例的触控面板，该方法具体包括步骤：交替地给第一电压信号端X+和第三电压信号端Y+输入驱动电压、以及同时给短接在一起的第二电压信号端X-和第四电压信号端Y-输入低电压，其中，在给第一电压信号端X+输入驱动电压时，读取第三电压信号端Y+的电压值，在给第三电压信号端Y+输入驱动电压时，读取第一电压信号端X+的电压值；根据读取的第三电压信号端Y+的电压值和读取第一电压信号端X+的电压值，计算触控点的坐标的值。
优选地，上述交替地给第一电压信号端X+和第三电压信号端Y+输入驱动电压、以及同时给短接在一起的第二电压信号端X-和第四电压信号端Y-输入低电压的步骤具体包括：在控制信号的控制下交替地给第一电压信号端X+和第三电压信号端Y+输入驱动电压、以及同时给短接在一起的第二电压信号端X-和第四电压信号端Y-输入低电压。
为了更加方便地确定触控点的坐标，优选地，给短接在一起的第二电压信号端X-和第四电压信号端Y-输入电压值为0V的低电压。
优选地，具体根据以下公式计算触控点的坐标的值：
Figure PCTCN2015070110-appb-000016
其中，R1为触控点与第一电压信号端X+之间的电阻，R2为触控点与第二电压信号端X-之间的电阻，R3为触控点与第三电压信号端Y+之间的电阻，R4为触控点与第四电压信号端Y-之间的电阻，R1+R2＝RX，R3+R4＝RY，
Figure PCTCN2015070110-appb-000017
a为触控面板上第三电压信号端Y+与第四电压信号端Y-之间的垂直距离，b为触控面板上第一电压信号端X+与第二电压信号端X-之间的垂直距离，Vx为读取的第一电压信号端X+的电压值，Vy为读取的第三电压信号端Y+的电压值。
该公式的具体推导与第一实施例中的相同，在此不详细描述。
由于本实施例中的触控面板为第一实施例中的触控面板，因此本实施例中提供的触控面板的触控点位置(坐标)的确定方法可以准确地确定触控面板上被进行触控的位置(坐标)。
[第三实施例]
本实施例提供一种显示装置，其包括第一实施例中的触控面板，故本实施例的显示装置的触控灵敏度较高。
该显示装置可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
当然，本实施例的显示装置中还可以包括其他常规结构，如显示驱动单元等。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。

Claims (12)

  1. 一种触控面板，其包括：相对间隔设置的第一透明导电层和第二透明导电层，第一透明导电层上设置有第一电压信号端和与第一电压信号端相对的第二电压信号端，第二透明导电层上设置有第三电压信号端和与第三电压信号端相对的第四电压信号端，第一电压信号端的延伸方向垂直于第三电压信号端的延伸方向，其中，
    所述第二信号电压端与所述第四电压信号端短接在一起，所述触控面板还包括：
    电压输出单元，所述电压输出单元用于根据控制信号交替地给第一电压信号端和第三电压信号端输入驱动电压、以及给短接在一起的第二电压信号端和第四电压信号端输入低电压；
    读取单元，所述读取单元用于在给第一电压信号端输入驱动电压时，读取第三电压信号端的电压值，在给第三电压信号端输入驱动电压时，读取第一电压信号端的电压值；以及
    计算单元，所述计算单元用于根据读取的第三电压信号端的电压值和读取第一电压信号端的电压值，计算触控点的坐标的值。
  2. 根据权利要求1所述的触控面板，其中，所述触控面板还包括控制单元，所述控制单元用于产生控制信号以控制所述电压输出单元的电压输出。
  3. 根据权利要求1或2所述的触控面板，其中，所述电压输出单元给短接在一起的第二电压信号端和第四电压信号端输入电压值为0V的低电压。
  4. 根据权利要求3所述的触控面板，其中，所述计算单元根据如下公式计算触控点的坐标(X，Y)的值：
    Figure PCTCN2015070110-appb-100001
    其中，
    R1为触控点与第一电压信号端之间的电阻；
    R2为触控点与第二电压信号端之间的电阻；
    R3为触控点与第三电压信号端之间的电阻；
    R4为触控点与第四电压信号端之间的电阻；
    R1+R2＝RX；
    R3+R4＝RY；
    Figure PCTCN2015070110-appb-100002
    a为触控面板上第三电压信号端与第四电压信号端之间的垂直距离；
    b为触控面板上第一电压信号端与第二电压信号端之间的垂直距离；
    Vx为读取的第一电压信号端的电压值；
    Vy为读取的第三电压信号端的电压值。
  5. 一种触控面板的触控点的确定方法，所述触控面板为权利要求1中所述的触控面板，所述方法包括步骤：
    交替地给第一电压信号端和第三电压信号端输入驱动电压、以及同时给短接在一起的第二电压信号端和第四电压信号端输入低电压；
    在给第一电压信号端输入驱动电压时，读取第三电压信号端的电压值，在给第三电压信号端输入驱动电压时，读取第一电压 信号端的电压值；以及
    根据读取的第三电压信号端的电压值和读取第一电压信号端的电压值，计算触控点的坐标的值。
  6. 根据权利要求5所述的触控面板的触控点的确定方法，其中，所述交替地给第一电压信号端和第三电压信号端输入驱动电压、以及同时给短接在一起的第二电压信号端和第四电压信号端输入低电压的步骤包括：
    在控制信号的控制下交替地给第一电压信号端和第三电压信号端输入驱动电压，以及同时给短接在一起的第二电压信号端和第四电压信号端输入低电压。
  7. 根据权利要求5或6所述的触控面板的触控点的确定方法，其中，给短接在一起的第二电压信号端和第四电压信号端输入电压值为0V的低电压。
  8. 根据权利要求7所述的触控面板的触控点的确定方法，其中，根据如下公式计算触控点的坐标的值：
    Figure PCTCN2015070110-appb-100003
    其中，
    R1为触控点与第一电压信号端之间的电阻；
    R2为触控点与第二电压信号端之间的电阻；
    R3为触控点与第三电压信号端之间的电阻；
    R4为触控点与第四电压信号端之间的电阻；
    R1+R2＝RX；
    R3+R4＝RY；
    Figure PCTCN2015070110-appb-100004
    a为触控面板上第三电压信号端到第四电压信号端之间的垂直距离；
    b为触控面板上第一电压信号端到第二电压信号端之间的垂直距离；
    Vx为读取的第一电压信号端的电压值；
    Vy为读取的第三电压信号端的电压值。
  9. 一种显示装置，包括权利要求1中所述的触控面板。
  10. 根据权利要求9所述的显示装置，其中，所述触控面板还包括控制单元，所述控制单元用于产生控制信号以控制所述电压输出单元的电压输出。
  11. 根据权利要求9或10所述的显示装置，其中，所述电压输出单元给短接在一起的第二电压信号端和第四电压信号端输入电压值为0V的低电压。
  12. 根据权利要求11所述的显示装置，其中，所述计算单元根据如下公式计算触控点的坐标(X，Y)的值：
    Figure PCTCN2015070110-appb-100005
    其中，
    R1为触控点与第一电压信号端之间的电阻；
    R2为触控点与第二电压信号端之间的电阻；
    R3为触控点与第三电压信号端之间的电阻；
    R4为触控点与第四电压信号端之间的电阻；
    R1+R2＝RX；
    R3+R4＝RY；
    Figure PCTCN2015070110-appb-100006
    a为触控面板上第三电压信号端与第四电压信号端之间的垂直距离；
    b为触控面板上第一电压信号端与第二电压信号端之间的垂直距离；
    Vx为读取的第一电压信号端的电压值；
    Vy为读取的第三电压信号端的电压值。
PCT/CN2015/070110 2014-09-24 2015-01-05 触控面板及触控点的确定方法、显示装置 WO2016045244A1 (zh)

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