WO2015096210A1 - 一种触摸液晶显示屏阵列基板及相应的触摸液晶显示屏 - Google Patents

一种触摸液晶显示屏阵列基板及相应的触摸液晶显示屏 Download PDF

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Publication number
WO2015096210A1
WO2015096210A1 PCT/CN2014/070355 CN2014070355W WO2015096210A1 WO 2015096210 A1 WO2015096210 A1 WO 2015096210A1 CN 2014070355 W CN2014070355 W CN 2014070355W WO 2015096210 A1 WO2015096210 A1 WO 2015096210A1
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Prior art keywords
touch
line
array substrate
lines
liquid crystal
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PCT/CN2014/070355
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English (en)
French (fr)
Inventor
徐向阳
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深圳市华星光电技术有限公司
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Priority to US14/240,479 priority Critical patent/US9563300B2/en
Publication of WO2015096210A1 publication Critical patent/WO2015096210A1/zh

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Classifications

    • 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
    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13318—Circuits comprising a photodetector
    • 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
    • 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
    • G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
    • 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
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • 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
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/18—Timing circuits for raster scan displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

Definitions

  • the invention relates to a liquid crystal display array substrate and a corresponding touch liquid crystal display.
  • the application is submitted to the Chinese Patent Office on December 26, 2013, and the application number is 201310730048.3.
  • the invention name is "a touch liquid crystal display array substrate and corresponding The priority of the Chinese Patent Application for Touching the Liquid Crystal Display, the entire contents of which are incorporated herein by reference.
  • the present invention relates to the field of thin film transistor liquid crystal display (TFT-LCD), and more particularly to a touch liquid crystal display array substrate and a corresponding touch liquid crystal display.
  • TFT-LCD thin film transistor liquid crystal display
  • LCD Liquid crystal display
  • Touching the LCD screen is one of the important carriers for integrating the input and output terminals.
  • Touching the LCD screen is one of the important carriers for integrating the input and output terminals.
  • the demand for touch-screen LCDs has surged.
  • the prior art In-Cell voltage-sensing touch liquid crystal display adopts a set of independent scanning address lines for implementing touch functions (including touch emission lines 41 and touch sensing lines). 42) to perform the positioning of the touch point, but, since the pixel structure of the liquid crystal display already has a set of scanning addressing lines for the display function (including the horizontal gate line 51 and the vertical data line 52), When the gate line 51 and the data line 52 used as the display functions are interleaved with the touch emission line 41 and the touch sensing line 42 used as the touch function, not only the aperture ratio of the pixel is lowered, but also the touch liquid crystal is prepared. The process difficulty of the display screen, the corresponding process defects will also increase; in addition, since the touch emission line 41 requires a separate driving signal, the power consumption of the touch liquid crystal display panel is further increased.
  • the technical problem to be solved by the present invention is to provide a touch liquid crystal display array substrate and a corresponding touch liquid crystal display, which can reduce the power consumption of the liquid crystal display, reduce the process difficulty and improve the process yield.
  • an aspect of an embodiment of the present invention provides a touch liquid crystal display array substrate including a plurality of pixel units defined by gate lines and data lines, and thin film transistors and pixel electrodes are formed in each pixel unit. ;
  • a parallel common electrode line is disposed beside each gate line
  • the array substrate further includes:
  • the touch circuit unit includes a touch transmission line, a touch sensing line, and a light sensing unit respectively connected to the touch emitting line and the touch sensing line at the intersection,
  • the control emission line is a common electrode line, and the touch sensing line is parallel to the data line.
  • the common electrode line and the gate line adopt synchronous second-order driving signals, and the voltage difference between the maximum voltage and the minimum voltage of the driving signal of the common electrode line is smaller than the voltage between the maximum voltage and the minimum voltage of the driving signal of the gate line difference.
  • the light sensing unit is a photodiode, and the photodiode and the active layer of the thin film transistor adopt the same metal pattern.
  • the touch circuit unit is disposed on the at least one pixel unit.
  • the method further includes an amplifying circuit connected to each touch sensing line and a signal processing unit.
  • a liquid crystal display array substrate including a plurality of pixel units defined by gate lines and data lines, and a thin film transistor and a pixel electrode are formed in each pixel unit; among them,
  • a parallel common electrode line is disposed beside each gate line
  • the array substrate further includes:
  • the touch circuit unit includes a touch transmission line, a touch sensing line, and a light sensing unit respectively connected to the touch emitting line and the touch sensing line at the intersection,
  • the control emission line is a common electrode line, and the touch sensing line is parallel to the data line;
  • the common electrode line and the gate line adopt synchronous second-order driving signals, and the voltage difference between the maximum voltage and the minimum voltage of the driving signal of the common electrode line is smaller than the maximum electric power of the driving signal of the gate line The voltage difference between the voltage and the minimum voltage.
  • the light sensing unit is a photodiode, and the photodiode and the active layer of the thin film transistor adopt the same metal pattern.
  • the touch circuit unit is disposed on the at least one pixel unit.
  • the method further includes an amplifying circuit connected to each touch sensing line and a signal processing unit.
  • the embodiment of the invention further provides a touch liquid crystal display, comprising:
  • the array substrate includes a plurality of pixel units defined by the gate lines and the data lines, and a thin film transistor and a pixel electrode are formed in each of the pixel units;
  • liquid crystal layer disposed between the array substrate and the color filter substrate
  • a parallel common electrode line is disposed beside each gate line
  • the array substrate further includes:
  • the touch circuit unit includes a touch transmission line, a touch sensing line, and a light sensing unit respectively connected to the touch emitting line and the touch sensing line at the intersection,
  • the control emission line is a common electrode line, and the touch sensing line is parallel to the data line.
  • the common electrode line and the gate line adopt synchronous second-order driving signals, and the voltage difference between the maximum voltage and the minimum voltage of the driving signal of the common electrode line is smaller than the voltage between the maximum voltage and the minimum voltage of the driving signal of the gate line difference.
  • the light sensing unit is a photodiode, and the photodiode and the active layer of the thin film transistor adopt the same metal pattern.
  • the touch circuit unit is disposed on the at least one pixel unit.
  • the method further includes an amplifying circuit connected to each touch sensing line and a signal processing unit.
  • the common electrode line realizes the function of the touch emission line in the touch circuit unit for touch positioning, that is, the common electrode line for the display function and the touch emission line for the touch function.
  • the second method uses a common scheme, and the same scanning signal is given by the IC to realize the display image while enabling touch positioning;
  • the scheme adopts a common armature and a line as a touch function of the touch transmission line, which reduces the line layout density in the pixel, increases the aperture ratio, reduces the number of processes, reduces the process difficulty, and improves the touch. Sensitivity of positioning;
  • the common electrode line and the gate line are synchronous second-order driving signals, and the voltage difference between the maximum voltage and the minimum voltage of the driving signal of the common electrode line is smaller than the maximum voltage and minimum of the driving signal of the gate line. The voltage difference between the voltages, thereby reducing the power consumption of the liquid crystal display for touch positioning;
  • the use of a second-order driving signal on the common electrode line can effectively eliminate the influence of the feed through voltage caused by the parasitic capacitance on the panel quality of the liquid crystal display panel.
  • FIG. 1 is a schematic structural view of a touch liquid crystal display in the prior art
  • FIG. 2 is a schematic structural view of an embodiment of a touch liquid crystal display array substrate according to the present invention
  • FIG. 3 is a partial enlarged view of FIG.
  • FIG. 4 is a block diagram of a circuit for performing touch positioning in a touch liquid crystal display array substrate of the present invention
  • FIG. 5 is a circuit schematic diagram of an embodiment of performing touch positioning in a touch liquid crystal display array substrate of the present invention
  • FIG. 6 is a schematic diagram showing the timing relationship of the synchronous second-order driving used in the touch liquid crystal display array substrate of the present invention.
  • FIG. 7 is a first schematic diagram showing the timing relationship of the touch control circuit unit in the touch liquid crystal display array substrate of the present invention.
  • FIG. 8 is a second timing diagram of the touch addressing of the touch control circuit unit in the touch liquid crystal display array substrate of the present invention.
  • the touch liquid crystal display array substrate comprises a plurality of gate lines 21 and a plurality of data lines. 22, a plurality of pixel units 3 are defined, a thin film transistor 30 and a pixel electrode 31 are formed in each of the pixel units 3, and the thin film transistor 30 is a TFT switch; wherein a parallel common electrode line 24 is disposed beside each gate line 21;
  • the array substrate further includes:
  • the touch circuit unit includes a touch transmission line, a touch sensing line, and a light sensing unit 12 respectively connected to the touch emitting line and the touch sensing line at the intersection,
  • the touch emission line is a common electrode line 24, and the touch sensing line 23 is parallel to the data line 22.
  • the light sensing unit 12 adopts a photodiode which is turned on when receiving light and is turned off when the light is blocked.
  • the photodiode can be used to form a switch for detecting whether there is a touch. When a touch occurs, the light on the photodiode is blocked.
  • the photosensitive semiconductor in the photodiode is a-Si or low-temperature polysilicon or the like, it can be patterned with the same layer of metal as the active layer of the thin film transistor 30;
  • the common electrode line 24 and the gate line 21 adopt synchronous second-order driving signals, and the voltage difference between the maximum voltage and the minimum voltage of the driving signal of the common electrode line 24 is smaller than the maximum voltage and the minimum voltage of the driving signal of the gate line 21. The voltage difference between them.
  • the touch circuit unit can be disposed on at least one pixel unit, since the pixel size of the liquid crystal display is generally small, and the general contact area is relatively large when the human finger touches the screen, which indicates that there is no need to A touch circuit unit is designed in each pixel unit. Since the touch emission line is shared with the gate line, the touch emission line is scanned for each row of pixel units; and the touch sensing line can be based on actual needs.
  • a row of touch sensing lines is designed for each of a plurality of pixels; for example, in one embodiment, the touch sensing lines can be equally spaced, for example, a column of touch sensing lines is designed every 2 pixels. It can be understood that each can also be used. Design a column of touch sensing lines across multiple pixels.
  • FIG. 4 it is a circuit block diagram of performing touch positioning in the touch liquid crystal display array substrate of the present invention; in this embodiment, the touch circuit unit is connected to an amplifying circuit, and the amplifying circuit is connected to the touch sensing unit. In the line, the amplifying circuit is connected to a signal processing unit, it can be understood that the amplifying circuit can be an operational amplifying circuit;
  • the photodiode in the touch control circuit unit is used to detect whether a touch occurs on the display screen. When there is no touch on the display area of the photodiode, the photodiode is in an on state due to external illumination, and the scan signal on the gate line passes. The photodiode and the touch receiving line are amplified by the amplifying circuit and transmitted to the signal processing unit. If a touch occurs, since the touch object blocks the photodiode, the photodiode is in an off state, and the scanning signal on the grid line cannot be The signal processing unit can determine whether each photodiode is turned on by the received signal, thereby positioning the touched area according to the position of the cut-off photodiode.
  • FIG. 5 is a schematic diagram of a touch circuit in an embodiment of performing touch positioning in a touch liquid crystal display array substrate of the present invention; it can be seen that the photodiode VD is connected to the touch emission line (common electrode line). Between the touch sensing line and the driving line for outputting the common electrode line under normal conditions, and interrupting the connection with the common electrode line when the external light is blocked, and outputting another electrical signal, the two different The electrical signal is delivered to the amplifier, and compared to the reference voltage Vref, the amplified electrical signal is output to a signal processing unit that locates the area where the touch occurs.
  • FIG. 6 is a schematic diagram showing the timing relationship of the synchronous second-order driving used in the touch liquid crystal display array substrate of the present invention; it can be seen that, in the embodiment of the present invention, the common electrode line 24 and the gate line 21 are synchronized in the second order.
  • the driving signal wherein Gate 1 to Gate 4 are driving signals of the common electrode line, Coml to Com4 and the like are driving signals of the gate lines, and STV is a scanning trigger signal, which is supplied to the array substrate by the timing controller; wherein, the common electrode line
  • the voltage difference between the maximum voltage and the minimum voltage of the driving signal of 24 is smaller than the voltage difference between the maximum voltage and the minimum voltage of the driving signal of the gate line 21, which can reduce the power consumption of the liquid crystal display for touch positioning;
  • the use of a second-order driving signal on the common electrode line can effectively eliminate the influence of the feed through voltage caused by the parasitic capacitance on the panel quality of the liquid crystal display.
  • FIG. 7 and FIG. 8 show the timing relationship of the touch addressing of the touch circuit unit.
  • Coml and Com2 Com n respectively represent the drive of n rows of common electrode lines touching the liquid crystal display array substrate.
  • the moving signals (scanning signals), SI, and S2 Sm respectively represent the m-column addressing signals of the touch circuit unit.
  • the touch liquid crystal display is normally displayed, that is, when there is no touch action, the common electrode line is periodically scanned according to the refresh frequency, and the touch sensing line is connected to the external signal processing unit, and the photodiodes are at In the on state, the address signal obtained by the external signal processing unit is the same as the drive signal of the common electrode line.
  • the signal processing unit can be positioned to a specific touch area according to the addressing signal S2 and the scanning frequency of the common electrode line.
  • the signal processing unit can also separately fix the signal changes of different touch sensing lines, thereby realizing the multi-touch function.
  • an embodiment of the present invention further provides a touch liquid crystal display including an array substrate, including a plurality of pixel units defined by gate lines and data lines, each of which forms a thin film transistor and a pixel electrode;
  • liquid crystal layer disposed between the array substrate and the color filter substrate
  • a parallel common electrode line is disposed beside each gate line
  • the array substrate further includes:
  • the touch circuit unit includes a touch transmission line, a touch sensing line, and a light sensing unit respectively connected to the touch emitting line and the touch sensing line at the intersection,
  • the control emission line is a common electrode line, and the touch sensing line is parallel to the data line.
  • the common electrode line and the gate line adopt a synchronous second-order driving signal, and the voltage difference between the maximum voltage and the minimum voltage of the driving signal of the common electrode line is smaller than the maximum voltage and the minimum voltage of the driving signal of the gate line. Voltage difference.
  • the light sensing unit is a photodiode, and the photodiode and the active layer of the thin film transistor are patterned by the same layer of metal.
  • the touch circuit unit is disposed on the at least one pixel unit.
  • the method further includes an amplifying circuit connected to each touch sensing line and signal processing Unit.
  • the common electrode line realizes the function of the touch emission line in the touch circuit unit for touch positioning, that is, the common electrode line for the display function and the touch emission line for the touch function.
  • the second method uses a common scheme, and the same scanning signal is given by the IC to realize the display image while enabling touch positioning;
  • the scheme adopts a common armature and a line as a touch function of the touch transmission line, which reduces the line layout density in the pixel, increases the aperture ratio, reduces the number of processes, reduces the process difficulty, and improves the touch. Sensitivity of positioning;
  • the common electrode line and the gate line are synchronous second-order driving signals, and the voltage difference between the maximum voltage and the minimum voltage of the driving signal of the common electrode line is smaller than the maximum voltage and minimum of the driving signal of the gate line. The voltage difference between the voltages, thereby reducing the power consumption of the liquid crystal display for touch positioning;
  • the use of a second-order driving signal on the common electrode line can effectively eliminate the influence of the feed through voltage caused by the parasitic capacitance on the panel quality of the liquid crystal display panel.

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  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Human Computer Interaction (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
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  • Liquid Crystal (AREA)
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  • Liquid Crystal Display Device Control (AREA)
  • Position Input By Displaying (AREA)

Abstract

一种触摸液晶显示屏阵列基板，包括由栅线（21）和数据线（22）限定的多个像素单元（3），每个像素单元（3）内形成薄膜晶体管（30）和像素电极（31）；在每一栅线（21）旁边设置有一个平行的公共电极线（24）；还包括：用于触摸定位的触控电路单元，所述触控电路单元包括彼此交叉的触控发射线（24）、触控感应线（23）以及设置于交叉处分别与所述触控发射线（24）和触控感应线（23）连接的光感应单元（12），触控发射线（24）为公共电极线（24），触控感应线（23）与数据线（22）平行。以及采用上述阵列基板的触摸液晶显示屏。采用上述阵列基板可以提升触摸定位的灵敏度、降低触摸显示屏的功耗以及提高产品良率。

Description

一种触摸液晶显示屏阵列基板及相应的触摸液晶显示屏 本申请要求于 2013 年 12 月 26 日提交中国专利局、 申请号为 201310730048.3、 发明名称为 "一种触摸液晶显示屏阵列基板及相应的触摸 液晶显示屏" 的中国专利申请的优先权， 上述专利的全部内容通过引用结合 在本申请中。 技术领域
本发明涉及薄膜晶体管液晶显示器（Thin Film Transistor liquid crystal display, TFT-LCD )领域， 特别涉及一种触摸液晶显示屏阵列基板及相应的 触摸液晶显示屏。
背景技术
液晶显示器（liquid crystal display, LCD )技术有了飞速的发展， 从屏 幕的尺寸到显示的质量都取得了极大的进步， LCD具有体积小、 功耗低、 无 辐射等特点， 现已占据了平面显示领域的主导地位。
触摸液晶显示屏是将输入、 输出终端一体化的重要载体之一。 近年来， 随着小巧、 轻盈的手持设备等一系列产品的问世， 市场对触摸液晶显示屏的 需求激增。
如图 1所示， 现有技术的内嵌式（In-Cell ) 电压感应式触摸液晶显示屏 采用一套独立的实现触摸功能的扫描寻址线路 (包括触控发射线 41 和触控 感应线 42 )来进行触摸点的定位， 但是， 由于液晶显示屏的像素结构中已经 有了一套用于显示功能的扫描寻址线路（包括横向的栅线 51 和纵向的数据 线 52 ), 因此， 当用作显示功能的栅线 51和数据线 52同用作触摸功能的触 控发射线 41和触控感应线 42交错在一起的时候，不仅降低了像素的开口率， 同时也会增加制备触摸液晶显示屏的工艺难度， 相应的工艺不良也会增多； 另外， 由于触控发射线 41 需要单独的驱动信号， 故会进一步增加式触摸液 晶显示屏的功耗。
发明内容 本发明所要解决的技术问题在于，提供一种触摸液晶显示屏阵列基板及 相应的触摸液晶显示屏， 可以降低液晶显示屏的功耗， 并降低工艺难度以及 提升工艺良率。
为了解决上述技术问题，本发明的实施例的一方面提供了一种触摸液晶 显示屏阵列基板， 包括由栅线和数据线限定的多个像素单元， 每个像素单元 内形成薄膜晶体管和像素电极；
在每一栅线旁边设置有一个平行的公共电极线；
阵列基板进一步包括：
用于触摸定位的触控电路单元，触控电路单元包括彼此交叉的触控发射 线、触控感应线以及设置于交叉处分别与触控发射线和触控感应线连接的光 感应单元， 触控发射线为公共电极线， 触控感应线与数据线平行。
其中， 公共电极线与栅线采用同步二阶驱动信号， 且的公共电极线的驱 动信号的最大电压与最小电压之间的电压差小于栅线的驱动信号的最大电 压与最小电压之间的电压差。
其中， 光感应单元为光敏二极管， 光敏二极管与薄膜晶体管的有源层采 用同一层金属构图。
其中， 触控电路单元设置在至少一个像素单元上。
其中， 进一步包括与每一触控感应线相连接的放大电路以及信号处理单 元。
相应地， 本发明实施例的另一方面， 还提供了一种触摸液晶显示屏阵列 基板， 包括由栅线和数据线限定的多个像素单元， 每个像素单元内形成薄膜 晶体管和像素电极； 其中，
在每一栅线旁边设置有一个平行的公共电极线；
阵列基板进一步包括：
用于触摸定位的触控电路单元，触控电路单元包括彼此交叉的触控发射 线、触控感应线以及设置于交叉处分别与触控发射线和触控感应线连接的光 感应单元， 触控发射线为公共电极线， 触控感应线与数据线平行；
其中， 公共电极线与栅线采用同步二阶驱动信号， 且的公共电极线的驱 动信号的最大电压与最小电压之间的电压差小于栅线的驱动信号的最大电 压与最小电压之间的电压差。
其中， 光感应单元为光敏二极管， 光敏二极管与薄膜晶体管的有源层采 用同一层金属构图。
其中， 触控电路单元设置在至少一个像素单元上。
其中， 进一步包括与每一触控感应线相连接的放大电路以及信号处理单 元。
相应地， 本发明实施例还提供一种触摸液晶显示屏， 包括：
阵列基板， 包括由栅线和数据线限定的多个像素单元， 每个像素单元内 形成薄膜晶体管和像素电极；
彩色滤光片基板， 与阵列基板相对； 以及
液晶层， 配置于阵列基板与彩色滤光片基板之间；
在每一栅线旁边设置有一个平行的公共电极线；
阵列基板进一步包括：
用于触摸定位的触控电路单元，触控电路单元包括彼此交叉的触控发射 线、触控感应线以及设置于交叉处分别与触控发射线和触控感应线连接的光 感应单元， 触控发射线为公共电极线， 触控感应线与数据线平行。
其中， 公共电极线与栅线采用同步二阶驱动信号， 且的公共电极线的驱 动信号的最大电压与最小电压之间的电压差小于栅线的驱动信号的最大电 压与最小电压之间的电压差。
其中， 光感应单元为光敏二极管， 光敏二极管与薄膜晶体管的有源层采 用同一层金属构图。
其中， 触控电路单元设置在至少一个像素单元上。
其中， 进一步包括与每一触控感应线相连接的放大电路以及信号处理单 元。
实施本发明的实施例， 具有如下的有益效果：
本发明的实施例中，使公共电极线实现用于触摸定位的触控电路单元中 的触控发射线的功能， 即将用于显示功能的公共电极线和用于触摸功能的触 控发射线合二为一采用共用的方案， 通过 IC给同样的扫描信号， 实现显示 图像的同时， 能够实现触摸定位； 该方案通过采用公共电枢及线作为触摸功能的触控发射线， 减少了像素 内的线路布置密度， 增加了开口率， 同时也减少了工艺进行的次数， 降低了 工艺难度， 并提升了触摸定位的灵敏度；
另外， 本发明实施例中将公共电极线与栅线采用同步二阶驱动信号， 且 公共电极线的驱动信号的最大电压与最小电压之间的电压差小于栅线的驱 动信号的最大电压与最小电压之间的电压差，从而可以降低该液晶显示屏用 于触摸定位的功耗；
而且，在公共电极线上采用二阶驱动信号可有效消除由于寄生电容所引 起的馈通（ feed through ) 电压对液晶显示屏的面板画质的影响。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其它的附图。
图 1为现有技术中触摸液晶显示屏的结构示意图；
图 2为本发明触摸液晶显示屏阵列基板的一个实施例的结构示意图； 图 3为图 2中的局部放大示意图；
图 4是本发明触摸液晶显示屏阵列基板中进行触摸定位的电路方框图； 图 5是本发明触摸液晶显示屏阵列基板中进行触摸定位的一个实施例中 的电路原理图；
图 6是本发明触摸液晶显示屏阵列基板所采用的同步二阶驱动的时序关 系示意图；
图 7是本发明触摸液晶显示屏阵列基板中触控制电路单元触控寻址的时 序关系示意图一；
图 8是本发明触摸液晶显示屏阵列基板中触控制电路单元触控寻址的时 序关系示意图二。
具体实施方式
以下各实施例的说明是参考附图， 用以式例本发明可以用以实施的特定 实施例。 本发明所提到的方向用语， 例如「上」、 「下」、 「前」、 「后」、 「左」、 Γ右」、 「内」、 「外」、 「侧面」等， 仅是参考附加图式的方向。 因此， 使用的 方向用语是用以说明及理解本发明， 而非用以限制本发明。
如图 2以及图 3所示， 示出了本发明触摸液晶显示屏阵列基板的一个实 施例， 在该实施例中， 该触摸液晶显示屏阵列基板包括由多条栅线 21 和多 条数据线 22限定的多个像素单元 3 , 每个像素单元 3内形成薄膜晶体管 30 和像素电极 31 , 薄膜晶体管 30为 TFT开关； 其中， 在每一栅线 21旁边设 置有一个平行的公共电极线 24;
该阵列基板进一步包括：
用于触摸定位的触控电路单元，触控电路单元包括彼此交叉的触控发射 线、触控感应线以及设置于交叉处分别与触控发射线和触控感应线连接的光 感应单元 12, 其中， 触控发射线为公共电极线 24, 触控感应线 23与数据线 22平行。
该光感应单元 12采用光敏二极管， 其在接收光线时导通， 当光线被遮 挡时截止， 采用该光敏二极管可以形成检测是否有触摸的开关， 当有触摸发 生时， 光敏二极管上的光线被遮挡。 由于光敏二极管中光敏半导体为 a-Si 或低温多晶硅等， 其可以与薄膜晶体管 30 的有源层采用同一层金属构图 ( atterning );
其中， 公共电极线 24与栅线 21采用同步二阶驱动信号， 且公共电极线 24的驱动信号的最大电压与最小电压之间的电压差小于栅线 21的驱动信号 的最大电压与最小电压之间的电压差。
进一步， 可以将触控电路单元设置在至少一个像素单元上， 由于液晶显 示器的像素尺寸通常比较小， 而人的手指触摸屏幕时， 一般的接触面积都是 比较大， 这就表明， 没有必要在每个像素单元内都设计一个触控电路单元， 由于触控发射线是与栅线共用的， 所以触控发射线是每一行像素单元都进行 扫描； 而触控感应线则可以根据实际的需要按每若干个像素设计一列触控感 应线路； 例如在一个实施例中， 可以将触控感应线等间距排列， 例如每隔 2 个像素设计一列触控感应线， 可以理解的是， 也可以每隔多个像素设计一列 触控感应线。 这样， 可以减少阵列基板上的触控感应线的布线数量， 也能提 高触控信号处理的效率。 如图 4所示，是本发明触摸液晶显示屏阵列基板中进行触摸定位的电路 方框图； 在本实施例中， 触控电路单元连接一放大电路， 该放大电路连接在 触控电路单元的控感应线上， 放大电路并与一信号处理单元进行连接， 可以 理解的是， 该放大电路可以是运算放大电路； 其中，
触控制电路单元中的光敏二极管用于检测显示屏上是否发生触摸， 当该 光敏二极管所处显示屏区域上没有触摸， 由于外界光照原因， 光敏二极管处 于导通状态，栅线上的扫描信号通过光敏二极管和触控接收线经放大电路的 放大后传递给信号处理单元， 如果有触控发生时， 由于触控物体遮挡了光敏 二极管， 因此光敏二极管处于断开状态， 栅线上的扫描信号不能传递给信号 处理单元； 信号处理单元通过接收到的信号可以判断各个光敏二极管是否导 通， 从而根据截止的光敏二极管的位置进而定位发生触摸的区域。
图 5示出了本发明触摸液晶显示屏阵列基板中进行触摸定位的一个实施 例中的一种触控电路原理图； 从中可以看出， 光敏二极管 VD连接在触控发 射线（公共电极线）与触控感应线之间， 用于在正常情况下输出公共电极线 上的驱动信号， 而在其外部光线被遮挡时中断与公共电极线的连接， 输出另 外的电信号，该两种不同的电信号被输送至放大器中，与参考电压 Vref相比 较， 输出经放大的电信号给信号处理单元， 该信号处理单元藉之定位出现触 摸的区域。
图 6示出了本发明触摸液晶显示屏阵列基板所采用的同步二阶驱动的时 序关系示意图； 从中可以看出， 在本发明的实施例中， 公共电极线 24与栅 线 21采用同步二阶驱动信号， 其中 Gate 1至 Gate 4等为公共电极线的驱动 信号， Coml至 Com4等为栅线的驱动信号， 而 STV为扫描触发信号， 由时 序控制器提供给阵列基板； 其中， 公共电极线 24的驱动信号的最大电压与 最小电压之间的电压差要小于栅线 21 的驱动信号的最大电压与最小电压之 间的电压差， 这样可以降低该液晶显示屏用于触摸定位的功耗； 且， 在公共 电极线上采用二阶驱动信号可有效消除由于寄生电容所引起的馈通 （feed through ) 电压对液晶显示屏的面板画质的影响。
图 7和图 8表示了触控电路单元触控寻址的时序关系。 其中 Coml , Com2 Com n分别表示触摸液晶显示屏阵列基板的 n行公共电极线的驱 动信号 （扫描信号）， SI , S2 Sm分别表示触控电路单元的 m列寻址信 号。
如图 7所示， 在触摸液晶显示屏正常显示的时候， 即没有触摸动作时， 公共电极线按照刷新频率进行周期性的扫描，触控感应线连接至外部信号处 理单元， 而各光敏二极管处于导通状态， 故外部信号处理单元所获得的寻址 信号与公共电极线的驱动信号相同。
如图 8所示， 当触摸液晶显示屏上有触摸操作时， 则其中一个光敏二极 管上的光线被遮住， 该光敏二极管断开， 故此光敏二极管所连接的触控感应 线所输出的电平为低电平， 如图中的寻址信号 S2所示， 故信号处理单元根 据该寻址信号 S2以及公共电极线的扫描频率可以定位到具体的触摸区域。 同理， 当触摸液晶显示屏上有多点触摸操作时， 信号处理单元也可以分别定 位不同触控感应线路的信号变化， 从而实现多点触控功能。
相应地， 本发明实施例还提供了一种触摸液晶显示屏， 其包括有阵列基 板， 包括由栅线和数据线限定的数个像素单元， 每个像素单元内形成薄膜晶 体管和像素电极；
彩色滤光片基板， 与阵列基板相对； 以及
液晶层， 配置于阵列基板与彩色滤光片基板之间；
在每一栅线旁边设置有一个平行的公共电极线；
阵列基板进一步包括：
用于触摸定位的触控电路单元，触控电路单元包括彼此交叉的触控发射 线、触控感应线以及设置于交叉处分别与触控发射线和触控感应线连接的光 感应单元， 触控发射线为公共电极线， 触控感应线与数据线平行。
优选地， 公共电极线与栅线采用同步二阶驱动信号， 且的公共电极线的 驱动信号的最大电压与最小电压之间的电压差小于栅线的驱动信号的最大 电压与最小电压之间的电压差。
优选地， 光感应单元为光敏二极管， 光敏二极管与薄膜晶体管的有源层 采用同一层金属构图。
优选地， 触控电路单元设置在至少一个像素单元上。
优选地， 进一步包括与每一触控感应线相连接的放大电路以及信号处理 单元。
可以理解的是， 关于该阵列基板的更多细节可以参照前述对图 2至图 6 的说明， 在此不再贅述。
综上， 实施本发明的实施例， 具有如下的有益效果：
本发明的实施例中，使公共电极线实现用于触摸定位的触控电路单元中 的触控发射线的功能， 即将用于显示功能的公共电极线和用于触摸功能的触 控发射线合二为一采用共用的方案， 通过 IC给同样的扫描信号， 实现显示 图像的同时， 能够实现触摸定位；
该方案通过采用公共电枢及线作为触摸功能的触控发射线， 减少了像素 内的线路布置密度， 增加了开口率， 同时也减少了工艺进行的次数， 降低了 工艺难度， 并提升了触摸定位的灵敏度；
另外， 本发明实施例中将公共电极线与栅线采用同步二阶驱动信号， 且 公共电极线的驱动信号的最大电压与最小电压之间的电压差小于栅线的驱 动信号的最大电压与最小电压之间的电压差，从而可以降低该液晶显示屏用 于触摸定位的功耗；
而且，在公共电极线上采用二阶驱动信号可有效消除由于寄生电容所引 起的馈通（ feed through ) 电压对液晶显示屏的面板画质的影响。
另外， 本发明实施例提供的技术方案可以应用在大尺寸的液晶面板上。 以上所揭露的仅为本发明较佳实施例而已， 当然不能以此来限定本发明 之权利范围， 因此等同变化， 仍属本发明所涵盖的范围。

Claims

权 利 要 求
1、 一种触摸液晶显示屏阵列基板， 包括由栅线和数据线限定的多个像 素单元， 每个像素单元内形成薄膜晶体管和像素电极；
其中，
在所述每一栅线旁边设置有一个平行的公共电极线；
所述阵列基板进一步包括：
用于触摸定位的触控电路单元， 所述触控电路单元包括彼此交叉的触控 发射线、触控感应线以及设置于所述交叉处分别与所述触控发射线和触控感 应线连接的光感应单元， 所述触控发射线为所述公共电极线， 所述触控感应 线与数据线平行。
2、 根据权利要求 1 所述的触摸液晶显示屏阵列基板， 其中， 所述公共 电极线与所述栅线采用同步二阶驱动信号，且所述的公共电极线的驱动信号 的最大电压与最小电压之间的电压差小于所述栅线的驱动信号的最大电压 与最小电压之间的电压差。
3、 根据权利要求 2所述的触摸液晶显示屏阵列基板， 其中， 所述光感 应单元为光敏二极管， 所述光敏二极管与所述薄膜晶体管的有源层采用同一 层金属构图。
4、 根据权利要求 1 所述的触摸液晶显示屏阵列基板， 其中， 所述触控 电路单元设置在至少一个像素单元上。
5、 根据权利要求 4所述的触摸液晶显示屏阵列基板， 其中， 进一步包 括与所述每一触控感应线相连接的放大电路以及信号处理单元。
6、 一种触摸液晶显示屏阵列基板， 包括由栅线和数据线限定的多个像 素单元， 每个像素单元内形成薄膜晶体管和像素电极； 其中，
在所述每一栅线旁边设置有一个平行的公共电极线；
所述阵列基板进一步包括：
用于触摸定位的触控电路单元， 所述触控电路单元包括彼此交叉的触控 发射线、触控感应线以及设置于所述交叉处分别与所述触控发射线和触控感 应线连接的光感应单元， 所述触控发射线为所述公共电极线， 所述触控感应 线与数据线平行；
其中， 所述公共电极线与所述栅线采用同步二阶驱动信号， 且所述的公 共电极线的驱动信号的最大电压与最小电压之间的电压差小于所述栅线的 驱动信号的最大电压与最小电压之间的电压差。
7、 根据权利要求 6所述的触摸液晶显示屏阵列基板， 其中， 所述光感 应单元为光敏二极管， 所述光敏二极管与所述薄膜晶体管的有源层采用同一 层金属构图。
8、 根据权利要求 7所述的触摸液晶显示屏阵列基板， 其中， 所述触控 电路单元设置在至少一个像素单元上。
9、 根据权利要求 7所述的触摸液晶显示屏阵列基板， 其中， 进一步包 括与所述每一触控感应线相连接的放大电路以及信号处理单元。
10、 一种触摸液晶显示屏， 包括：
阵列基板， 包括由栅线和数据线限定的多个像素单元， 每个像素单元内 形成薄膜晶体管和像素电极；
彩色滤光片基板， 与所述阵列基板相对； 以及
液晶层， 配置于所述阵列基板与所述彩色滤光片基板之间；
其中，
在所述每一栅线旁边设置有一个平行的公共电极线；
所述阵列基板进一步包括：
用于触摸定位的触控电路单元， 所述触控电路单元包括彼此交叉的触控 发射线、触控感应线以及设置于所述交叉处分别与所述触控发射线和触控感 应线连接的光感应单元， 所述触控发射线为所述公共电极线， 所述触控感应 线与数据线平行。
11、 根据权利要求 10所述的触摸液晶显示屏， 其中， 所述公共电极线 与所述栅线采用同步二阶驱动信号，且所述的公共电极线的驱动信号的最大 电压与最小电压之间的电压差小于所述栅线的驱动信号的最大电压与最小 电压之间的电压差。
12、 根据权利要求 11 所述的触摸液晶显示屏， 其中， 所述光感应单元 为光敏二极管， 所述光敏二极管与所述薄膜晶体管的有源层采用同一层金属 构图。
13、 根据权利要求 12所述的触摸液晶显示屏， 其中， 所述触控电路单 元设置在至少一个像素单元上。
14, 根据权利要求 13所述的触摸液晶显示屏， 其中， 进一步包括与所 述每一触控感应线相连接的放大电路以及信号处理单元。
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