WO2016187912A1 - 触控显示装置及其控制方法、电路 - Google Patents

触控显示装置及其控制方法、电路 Download PDF

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Publication number
WO2016187912A1
WO2016187912A1 PCT/CN2015/081849 CN2015081849W WO2016187912A1 WO 2016187912 A1 WO2016187912 A1 WO 2016187912A1 CN 2015081849 W CN2015081849 W CN 2015081849W WO 2016187912 A1 WO2016187912 A1 WO 2016187912A1
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Prior art keywords
control signal
touch
phase
display device
common electrode
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Ceased
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PCT/CN2015/081849
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English (en)
French (fr)
Inventor
卢宇程
黄俊宏
黄耀立
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Wuhan China Star Optoelectronics Technology Co Ltd
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to US14/786,033 priority Critical patent/US20170153758A1/en
Publication of WO2016187912A1 publication Critical patent/WO2016187912A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • 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
    • 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
    • G09G3/367—Control of matrices with row and column drivers with a nonlinear element in series with the liquid crystal cell, e.g. a diode, or M.I.M. element

Definitions

  • the present invention relates to the field of touch display technologies, and in particular, to a touch display device, and to a method and circuit for controlling the touch display device.
  • capacitive touch screens are widely used in various electronic products such as mobile phones and tablet computers.
  • the more common capacitive touch screens are OGS (One Glass Solution) type touch screen, On-Cell type touch screen and In-Cell type touch screen.
  • OGS One Glass Solution
  • On-Cell type touch screen is widely used in various electronic products such as mobile phones and tablet computers.
  • In-Cell technology can make the capacitive touch screen more light and light, and better light transmission.
  • FIG. 1 is a schematic view showing the structure of a common electrode of a liquid crystal display device having an in-cell touch panel in the prior art.
  • the common electrode includes a plurality of square electrodes 1 arranged in a matrix. Each of the square electrodes 1 is connected to the control circuit 3 via its corresponding addressing line 2.
  • the control circuit 3 controls the respective square electrodes 1 in a time division manner. Specifically, in the display phase, the control circuit 3 drives the square electrode 1 to the potential required for display. In the touch phase, the control circuit 3 supplies the touch detection signal to the square electrode 1.
  • the above liquid crystal display device with an in-cell touch panel has at least the following technical defects: in the touch phase, the common electrode serves as a touch detection electrode, and a parasitic capacitance is easily formed between the common electrode and the data line.
  • the parasitic capacitance is in series with the self-capacitance between the square electrode 1 and the ground, reducing the induced capacitance. The reduction of the sensing capacitance causes the driving force of the control circuit 3 to be insufficient, so that the control circuit 3 cannot perform normal touch detection.
  • the present invention is directed to solving the technical drawbacks of the prior art liquid crystal display device having an in-cell touch panel.
  • the common electrode functions as a touch detection electrode, and a parasitic capacitance is easily formed between the common electrode and the data line.
  • the parasitic capacitance is connected in series with the self-capacitance between the square electrode and the ground, reducing the induced capacitance.
  • the reduction of the sensing capacitance will The driving force of the control circuit is insufficient, so that the control circuit cannot perform normal touch detection.
  • the present invention provides a touch display device, a control method thereof, and a circuit.
  • a touch display device comprising:
  • An array substrate having gate lines, data lines, and thin film transistors
  • a control circuit that supplies a first control signal for turning off the thin film transistor to the gate line during a touch phase, provides a second control signal to the data line, and provides a third control to the common electrode a signal; the amplitude, frequency, and phase of the second control signal are respectively the same as the amplitude, frequency, and phase of the third control signal.
  • control circuit further provides a display control signal to the gate line during the display phase, a pixel voltage signal to the data line, and a common voltage signal to the common electrode.
  • the first control signal, the second control signal or the third control signal is a pulse signal.
  • a method for controlling the above touch display device including:
  • the amplitude, frequency, and phase of the second control signal are respectively the same as the amplitude, frequency, and phase of the third control signal.
  • the foregoing control method further includes:
  • a display control signal is provided to the gate line, a pixel voltage signal is provided to the data line, and a common voltage signal is provided to the common electrode.
  • the first control signal, the second control signal or the third control signal is a pulse signal.
  • a circuit for controlling the above touch display device including:
  • the gate line control module provides a first control signal for turning off the thin film transistor of the touch display device to the gate line of the touch display device during the touch phase;
  • the data line control module provides a second control signal to the data line of the touch display device during the touch phase
  • a common electrode control module configured to provide a third control signal to the common electrode of the touch display device during the touch phase
  • the amplitude, frequency, and phase of the second control signal are respectively the same as the amplitude, frequency, and phase of the third control signal.
  • the gate line control module further provides a display control signal to the gate line during a display phase;
  • the data line control module further provides a pixel voltage signal to the data line during the display phase;
  • Common electrode control mode The block also provides a common voltage signal to the common electrode during the display phase.
  • the first control signal, the second control signal or the third control signal is a pulse signal.
  • the control circuit controls the thin film transistors of the touch display device to be turned off on the one hand, and provides the same control signal to the data lines and the common electrodes on the other hand.
  • the data line and the common electrode are always equipotential in the touch phase, that is, the parasitic capacitance composed of the data line and the common electrode cannot be charged. Therefore, the present invention effectively avoids the influence of the parasitic capacitance formed by the data line and the common electrode on detecting the touch signal, and improves the precision of the touch detection.
  • FIG. 1 is a schematic structural view of a common electrode of a liquid crystal display device having an in-cell touch panel in the prior art
  • FIG. 2 is a schematic diagram showing control signals of a touch display device according to an embodiment of the present invention.
  • FIG. 3 is a schematic flow chart showing a method for controlling a touch display device according to an embodiment of the present invention
  • FIG. 4 is a block diagram showing the structure of a circuit for controlling a touch display device according to the present invention.
  • the present invention is directed to solving the technical drawbacks of the prior art liquid crystal display device having an in-cell touch panel.
  • the common electrode functions as a touch detection electrode, and a parasitic capacitance is easily formed between the common electrode and the data line.
  • the parasitic capacitance is connected in series with the self-capacitance between the square electrode and the ground, reducing the induced capacitance.
  • the reduction of the sensing capacitance causes the driving force of the control circuit to be insufficient, so that the control circuit cannot perform normal touch detection.
  • an embodiment of the present invention provides a touch display device.
  • the touch display device includes a color film substrate, an array substrate, a common electrode, and a control circuit.
  • the array substrate includes a sub-pixel unit array divided by a plurality of gate lines and a plurality of data lines.
  • a Thin Film Transistor (TFT) and a pixel electrode are disposed in each of the sub-pixel units.
  • the common electrode includes a plurality of square electrodes arranged in a matrix. Each square electrode is connected to the control circuit by its corresponding addressing line.
  • the control circuit is electrically connected to each of the gate lines, the data lines, and the respective square electrodes of the touch display device through its signal output interface.
  • the control circuit respectively sends corresponding control signals to the common electrode and the gate lines and data lines connected to the thin film transistors.
  • FIG. 2 it is a schematic diagram of a control signal in a touch display device.
  • the control circuit provides a first control signal to the gate line, a second control signal to the data line, and a third control signal to the common electrode.
  • the first control signal is used to turn off the thin film transistor connected to the gate line receiving the signal.
  • the amplitude, frequency and phase of the second control signal correspond to the amplitude, frequency and phase of the third control signal, respectively.
  • control circuit provides a third control signal to the common electrode, meaning that the control circuit provides the same third control signal to each of the square electrodes used to form the common electrode.
  • the time required for touch scanning can be reduced, and the time of display scanning is correspondingly increased, thereby providing favorable conditions for higher resolution display.
  • there is no false alarm point and the screen can be reported normally when the screen is covered with water mist or water droplets, thereby improving the touch performance such as the report rate and the signal-to-noise ratio.
  • the control circuit causes the amplitude, frequency, and phase of the second control signal supplied to the data line to correspond to the amplitude, frequency, and phase of the third control signal supplied to the common electrode, respectively.
  • the second control signal and the third control signal are the same signal, that is, the data line and the common electrode are always equipotential in the touch phase, and the parasitic capacitance formed by the data line and the common electrode cannot be charged. . Therefore, the embodiment of the invention effectively avoids the influence of the parasitic capacitance formed by the data line and the common electrode on detecting the touch signal, and improves the precision of the touch detection.
  • control circuit is further configured to provide a display control signal to the gate line during the display phase, a pixel voltage signal to the data line, and a common voltage signal to the common electrode.
  • control circuit may only have the function of controlling touch detection. That is to say, the control circuit can be such that the parasitic capacitance formed by the data line and the common electrode cannot be charged during the touch phase.
  • the first control signal, the second control signal or the third control signal is a pulse signal, such as a square wave signal, a sine wave signal or a step signal.
  • the present invention does not limit the form of the first control signal, the second control signal, or the third control signal. That is, the first control signal, the second control signal, and the third control signal may not be pulse signals.
  • the embodiment of the invention further provides a method for controlling the touch display device.
  • FIG. 3 is a schematic flow chart of a method for controlling a touch display device according to an embodiment of the present invention.
  • the control method described in this embodiment mainly includes step 101 and step 102.
  • step 101 it is determined whether the touch display device is in the touch phase.
  • step 102 when it is determined that the touch display device is in the touch phase, the first control signal for turning off the thin film transistor of the touch display device is provided to the gate line of the touch display device, and the touch control device is turned to the touch display device.
  • the data line provides a second control signal and provides a third control signal to the common electrode of the touch display device.
  • the amplitude, frequency, and phase of the second control signal are respectively the same as the amplitude, frequency, and phase of the third control signal.
  • control circuit provides a third control signal to the common electrode, meaning that the control circuit provides the same third control signal to each of the square electrodes used to form the common electrode.
  • the time required for touch scanning can be reduced, and the time of display scanning is correspondingly increased, thereby providing favorable conditions for higher resolution display.
  • there is no false alarm point and the screen can be reported normally when the screen is covered with water mist or water droplets, thereby improving the touch performance such as the report rate and the signal-to-noise ratio.
  • the thin film transistors corresponding to the gate lines are cut off by lowering the voltages of all the gate lines of the touch display device. . Therefore, no matter how the potential on the data line changes during the touch phase, the display effect is not affected.
  • the second control signal supplied to the data line can be made the same as the third control signal supplied to the common electrode. Since the data line and the common electrode are always the same (equal potential) in the touch phase, the parasitic capacitance composed of the data line and the common electrode cannot be charged. It can be seen that the embodiment of the invention effectively avoids the influence of the parasitic capacitance formed by the data line and the common electrode on detecting the touch signal, and improves the precision of the touch detection.
  • control method further includes step 103 and step 104.
  • step 103 it is determined whether the touch display device is in the display phase when it is determined that the touch display device is not in the touch phase.
  • step 104 when it is determined that the touch display device is in the display phase, the display control signal is provided to the gate line, the pixel voltage signal is supplied to the data line, and the common voltage signal is supplied to the common electrode.
  • the first control signal, the second control signal or the third control signal is a pulse signal, such as a square wave signal, a sine wave signal or a step signal.
  • the present invention does not limit the form of the first control signal, the second control signal, or the third control signal. That is, the first control signal, the second control signal, and the third control signal may not be pulse signals.
  • an embodiment of the present invention further provides a circuit for controlling the touch display device.
  • FIG. 4 is a schematic structural diagram of a circuit for controlling a touch display device according to an embodiment of the present invention.
  • the control circuit mainly includes a gate line control module 201, a data line control module 202, and a common electrode control module 203.
  • the gate line control module 201 is electrically connected to the gate line of the touch display device 204.
  • the gate line control module 201 is configured to provide a first control signal for turning off the thin film transistor of the touch display device 204 to the gate line of the touch display device 204 during the touch phase.
  • the data line control module 202 is electrically connected to the data line of the touch display device 204.
  • the data line control module 202 is configured to provide a second control signal to the data line of the touch display device 204 during the touch phase.
  • the common electrode control module 203 is electrically connected to the common electrode of the touch display device 204.
  • the common electrode control module 203 is configured to provide a third control signal to the common electrode of the touch display device 204 during the touch phase.
  • the amplitude, frequency and phase of the second control signal correspond to the amplitude, frequency and phase of the third control signal, respectively.
  • the common electrode control module 203 provides a third control signal to the common electrode, meaning that the common electrode control module 203 provides the same third control signal to each of the square electrodes for forming the common electrode.
  • the time required for touch scanning can be reduced, and the time of display scanning is correspondingly increased, thereby providing favorable conditions for higher resolution display.
  • there is no false alarm point and the screen can be reported normally when the screen is covered with water mist or water droplets, thereby improving the touch performance such as the report rate and the signal-to-noise ratio.
  • the gate line control module 201 lowers the voltages of all the gate lines of the touch display device 204 during the touch control phase, so that the thin film transistors corresponding to the gate lines are all turned off. Therefore, no matter how the potential on the data line changes during the touch phase, the display effect is not affected.
  • the second control signal provided by the data line control module 202 to the data line may be the same as the third control signal of the common electrode control module 203 to the common electrode. Since the data line and the common electrode are always the same (equal potential) in the touch phase, the parasitic capacitance composed of the data line and the common electrode cannot be charged. It can be seen that the embodiment of the invention effectively avoids the influence of the parasitic capacitance formed by the data line and the common electrode on detecting the touch signal, and improves the precision of the touch detection.
  • the gate line control module 201 is further configured to provide a display control signal to the gate line during the display phase.
  • the data line control module 202 is further configured to provide a pixel voltage signal to the data line during the display phase.
  • the common electrode control module 203 is further configured to provide a common voltage signal to the common electrode during the display phase.
  • the control circuit may only have the function of controlling touch detection. That is to say, the control circuit can be such that the parasitic capacitance formed by the data line and the common electrode cannot be charged during the touch phase.
  • the first control signal, the second control signal or the third control signal is a pulse signal or a staircase signal.
  • the present invention does not limit the form of the first control signal, the second control signal, or the third control signal. That is, the first control signal, the second control signal or the third control signal may not be a pulse signal.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed over a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in a storage device by a computing device, or they may be fabricated into individual integrated circuit modules, or many of them Modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种触控显示装置(204)及其控制方法、电路（201，202, 203）。在触控阶段，控制电路（201，202, 203）使触控显示装置(204)的薄膜晶体管截止的同时，数据线和公共电极提供相同的控制信号。数据线和公共电极在触控阶段始终等电位，即由数据线和公共电极构成的寄生电容无法被充电，该触控显示装置(204)及其控制方法、电路（201，202, 203）有效避免了上述寄生电容对检测触控信号的影响，提高了触控检测的精度。

Description

触控显示装置及其控制方法、电路
本申请要求享有2015年5月26日提交的名称为“触控显示装置及其控制方法、电路”的中国专利申请CN201510276420.7的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及触控显示技术领域，尤其涉及一种触控显示装置，还涉及一种用于控制该触控显示装置的方法及电路。
背景技术
随着智能电子产品的普及，电容式触控屏被广泛地应用于手机、平板电脑等各种电子产品中。目前较为常见的电容式触控屏有OGS(One Glass Solution)式触控屏、On-Cell式触控屏和In-Cell式触控屏。其中，由于制作工艺上的优势，In-Cell技术能使电容式触控屏更加轻薄、透光性更好。
现有技术中具有内嵌式(In-Cell)触控屏的液晶显示装置通常采用显示与触控分时扫描的方式控制公共电极。图1示出了现有技术中具有内嵌式触控屏的液晶显示装置的公共电极的结构示意图。参照图1，公共电极包括呈矩阵排布的多个方块电极1。每个方块电极1均通过其对应的寻址线2连接控制电路3。控制电路3分时控制各个方块电极1。具体地，在显示阶段，控制电路3将方块电极1驱动至显示所需的电位。在触控阶段，控制电路3向方块电极1提供触控检测信号。
上述具有内嵌式触控屏的液晶显示装置至少存在以下技术缺陷：在触控阶段，公共电极作为触控检测电极，在公共电极与数据线之间容易形成寄生电容。该寄生电容与方块电极1和地之间的自电容串联，减少了感应电容。感应电容的减少会导致控制电路3的驱动力不足，使得控制电路3无法进行正常的触控检测。
发明内容
本发明旨在解决现有技术中具有内嵌式触控屏的液晶显示装置存在的技术缺陷。具体地，在触控阶段，公共电极作为触控检测电极，在公共电极与数据线之间容易形成寄生电容。该寄生电容与方块电极和地之间的自电容串联，减少了感应电容。感应电容的减少会 导致控制电路的驱动力不足，使得控制电路无法进行正常的触控检测。
为了解决上述技术问题，本发明提供了一种触控显示装置及其控制方法、电路。
根据本发明的第一个方面，提供了一种触控显示装置，其包括：
公共电极；
阵列基板，其具有栅极线、数据线和薄膜晶体管；以及
控制电路，其在触控阶段向所述栅极线提供用于使所述薄膜晶体管截止的第一控制信号，向所述数据线提供第二控制信号，并向所述公共电极提供第三控制信号；所述第二控制信号的幅值、频率和相位分别与所述第三控制信号的幅值、频率和相位对应相同。
优选的是，所述控制电路，还在显示阶段向所述栅极线提供显示控制信号，向所述数据线提供像素电压信号，并向所述公共电极提供公共电压信号。
优选的是，所述第一控制信号、所述第二控制信号或者所述第三控制信号为脉冲信号。
根据本发明的第二个方面，提供了一种用于控制上述触控显示装置的方法，其包括：
在触控阶段，向所述触控显示装置的栅极线提供用于使该触控显示装置的薄膜晶体管截止的第一控制信号，向所述触控显示装置的数据线提供第二控制信号，并向所述触控显示装置的公共电极提供第三控制信号；
其中，所述第二控制信号的幅值、频率和相位分别与所述第三控制信号的幅值、频率和相位对应相同。
优选的是，上述控制方法还包括：
在显示阶段，向所述栅极线提供显示控制信号，向所述数据线提供像素电压信号，并向所述公共电极提供公共电压信号。
优选的是，所述第一控制信号、所述第二控制信号或者所述第三控制信号为脉冲信号。
根据本发明的第三个方面，提供了一种用于控制上述触控显示装置的电路，其包括：
栅极线控制模块，在触控阶段向所述触控显示装置的栅极线提供用于使该触控显示装置的薄膜晶体管截止的第一控制信号；
数据线控制模块，在所述触控阶段向所述触控显示装置的数据线提供第二控制信号；
公共电极控制模块，在所述触控阶段向所述触控显示装置的公共电极提供第三控制信号；
其中，所述第二控制信号的幅值、频率和相位分别与所述第三控制信号的幅值、频率和相位对应相同。
优选的是，所述栅极线控制模块还在显示阶段向所述栅极线提供显示控制信号；所述数据线控制模块还在所述显示阶段向所述数据线提供像素电压信号；所述公共电极控制模 块还在所述显示阶段向所述公共电极提供公共电压信号。
优选的是，所述第一控制信号、所述第二控制信号或者所述第三控制信号为脉冲信号。
与现有技术相比，上述方案中的一个或多个实施例可以具有如下优点或有益效果：
应用本发明所述的触控显示装置，在触控阶段，控制电路一方面控制触控显示装置的薄膜晶体管都截止，另一方面向数据线和公共电极提供相同的控制信号。数据线和公共电极在触控阶段始终等电位，即由数据线和公共电极构成的寄生电容无法被充电。因此，本发明有效避免了由数据线和公共电极构成的寄生电容对检测触控信号的影响，提高了触控检测的精度。
本发明的其它特征和优点将在随后的说明书中阐述，并且部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例共同用于解释本发明，并不构成对本发明的限制。在附图中：
图1示出了现有技术中具有内嵌式触控屏的液晶显示装置的公共电极的结构示意图；
图2示出了本发明实施例中触控显示装置的控制信号的示意图；
图3示出了本发明实施例用于控制触控显示装置的方法的流程示意图；以及
图4示出了本发明实施用于控制触控显示装置的电路的结构示意图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。
本发明旨在解决现有技术中具有内嵌式触控屏的液晶显示装置存在的技术缺陷。具体地，在触控阶段，公共电极作为触控检测电极，在公共电极与数据线之间容易形成寄生电容。该寄生电容与方块电极和地之间的自电容串联，减少了感应电容。感应电容的减少会导致控制电路的驱动力不足，使得控制电路无法进行正常的触控检测。为了解决上述技术问题，本发明实施例提供了一种触控显示装置。
在本实施例中，触控显示装置包括彩膜基板、阵列基板、公共电极和控制电路。其中， 阵列基板包括由若干栅极线和若干数据线划分成的子像素单元阵列。每个子像素单元中设置有薄膜晶体管(Thin Film Transistor,TFT)和像素电极。公共电极包括呈矩阵排布的多个方块电极。每个方块电极均通过其对应的寻址线连接至控制电路。
控制电路通过其信号输出接口分别与触控显示装置的各条栅极线、各条数据线和各个方块电极电连接。对于触控显示装置的任意一个子像素单元的薄膜晶体管，在触控阶段，控制电路分别向公共电极以及与该薄膜晶体管相连的栅极线和数据线发送相应的控制信号。具体地，参照图2，是触控显示装置中控制信号的示意图。在触控阶段，控制电路向栅极线提供第一控制信号，向数据线提供第二控制信号，并向公共电极提供第三控制信号。其中，第一控制信号用于使与接收该信号的栅极线连接的薄膜晶体管截止。第二控制信号的幅值、频率和相位分别与第三控制信号的幅值、频率和相位对应相同。
值得注意的是，控制电路向公共电极提供第三控制信号，指的是：控制电路向用于构成公共电极的每个方块电极提供相同的第三控制信号。这样，可以减少触控扫描所需的时间，相应地增加显示扫描的时间，从而为更高解析度的显示提供了有利条件。另外不会产生误报点，在屏幕沾有水雾或水滴的情况下也可以正常报点，从而提高了报点率、信噪比等触控性能。
在本实施例中，在触控阶段，由于控制电路将所有栅极线的电压都拉低，使各栅极线对应的薄膜晶体管都截止，因此在此阶段无论数据线上的电位怎样变化，都不会影响液晶电容，即不会影响显示效果。在此阶段，控制电路使提供给数据线的第二控制信号的幅度、频率和相位分别与提供给公共电极的第三控制信号的幅度、频率和相位对应相同。可以看出，在触控阶段，第二控制信号和第三控制信号是相同的信号，即数据线和公共电极在触控阶段始终等电位，由数据线和公共电极构成的寄生电容无法被充电。因此，本发明实施例有效避免了由数据线和公共电极构成的寄生电容对检测触控信号的影响，提高了触控检测的精度。
在本发明一优选的实施例中，控制电路还用于在显示阶段向栅极线提供显示控制信号，向数据线提供像素电压信号，并向公共电极提供公共电压信号。但是本发明对此不作限制。在其他实施例中，控制电路可以只具备控制触控检测的功能。也就是说，控制电路只要能够在触控阶段起到使由数据线和公共电极构成的寄生电容无法被充电即可。
在本发明一优选的实施例中，第一控制信号、第二控制信号或者第三控制信号为脉冲信号，例如方波信号、正弦波信号或阶梯信号等。但是，本发明对第一控制信号、第二控制信号或第三控制信号的形式不作限制。即第一控制信号、第二控制信号和第三控制信号也可以不是脉冲信号。
相应地，本发明实施例还提供了一种用于控制上述触控显示装置的方法。
如图3所示，是本发明实施例用于控制触控显示装置的方法的流程示意图。本实施例所述的控制方法，主要包括步骤101和步骤102。
在步骤101中，判断触控显示装置是否处于触控阶段。
在步骤102中，判断出触控显示装置处于触控阶段时，向触控显示装置的栅极线提供用于使该触控显示装置的薄膜晶体管截止的第一控制信号，向触控显示装置的数据线提供第二控制信号，并向触控显示装置的公共电极提供第三控制信号。其中，第二控制信号的幅值、频率和相位分别与第三控制信号的幅值、频率和相位对应相同。
值得注意的是，控制电路向公共电极提供第三控制信号，指的是：控制电路向用于构成公共电极的每个方块电极提供相同的第三控制信号。这样，可以减少触控扫描所需的时间，相应地增加显示扫描的时间，从而为更高解析度的显示提供了有利条件。另外不会产生误报点，在屏幕沾有水雾或水滴的情况下也可以正常报点，从而提高了报点率、信噪比等触控性能。
应用本实施例所述的控制方法，当判断出触控显示装置处于触控阶段时，通过将触控显示装置的所有栅极线的电压都拉低使各栅极线对应的薄膜晶体管都截止。因此，在触控阶段无论数据线上的电位怎样变化，都不会影响显示效果。此时，可使提供给数据线的第二控制信号与提供给公共电极的第三控制信号相同。由于数据线和公共电极在触控阶段始终相同(等电位)，因此由数据线和公共电极构成的寄生电容无法被充电。可以看出，本发明实施例有效避免了由数据线和公共电极构成的寄生电容对检测触控信号的影响，提高了触控检测的精度。
仍参照图3，在本发明一优选的实施例中，上述控制方法还包括步骤103和步骤104。
在步骤103中，判断出触控显示装置未处于触控阶段时，判断触控显示装置是否处于显示阶段。
在步骤104中，判断出触控显示装置处于显示阶段时，向栅极线提供显示控制信号，向数据线提供像素电压信号，并向公共电极提供公共电压信号。
在本发明一优选的实施例中，第一控制信号、第二控制信号或者第三控制信号为脉冲信号，例如方波信号、正弦波信号或阶梯信号等。但是，本发明对第一控制信号、第二控制信号或第三控制信号的形式不作限制。即第一控制信号、第二控制信号和第三控制信号也可以不是脉冲信号。
相应地，本发明实施例还提供了一种用于控制上述触控显示装置的电路。
如图4所示，是本发明实施例用于控制触控显示装置的电路的结构示意图。本实施例 所述的控制电路主要包括栅极线控制模块201、数据线控制模块202和公共电极控制模块203。
具体地，栅极线控制模块201与触控显示装置204的栅极线电连接。栅极线控制模块201设置为在触控阶段向触控显示装置204的栅极线提供用于使该触控显示装置204的薄膜晶体管截止的第一控制信号。
数据线控制模块202与触控显示装置204的数据线电连接。数据线控制模块202设置为在触控阶段向触控显示装置204的数据线提供第二控制信号。
公共电极控制模块203与触控显示装置204的公共电极电连接。公共电极控制模块203设置为在触控阶段向触控显示装置204的公共电极提供第三控制信号。重要地，第二控制信号的幅值、频率和相位分别与第三控制信号的幅值、频率和相位对应相同。
值得注意的是，公共电极控制模块203向公共电极提供第三控制信号，指的是：公共电极控制模块203向用于构成公共电极的每个方块电极提供相同的第三控制信号。这样，可以减少触控扫描所需的时间，相应地增加显示扫描的时间，从而为更高解析度的显示提供了有利条件。另外不会产生误报点，在屏幕沾有水雾或水滴的情况下也可以正常报点，从而提高了报点率、信噪比等触控性能。
应用本实施例所述的控制电路，在触控阶段，栅极线控制模块201将触控显示装置204的所有栅极线的电压都拉低，使各栅极线对应的薄膜晶体管都截止。因此，在触控阶段无论数据线上的电位怎样变化，都不会影响显示效果。此时，可使数据线控制模块202向数据线提供的第二控制信号与公共电极控制模块203向公共电极的第三控制信号相同。由于数据线和公共电极在触控阶段始终相同(等电位)，因此由数据线和公共电极构成的寄生电容无法被充电。可以看出，本发明实施例有效避免了由数据线和公共电极构成的寄生电容对检测触控信号的影响，提高了触控检测的精度。
在本发明一优选的实施例中，栅极线控制模块201还设置为：在显示阶段向栅极线提供显示控制信号。数据线控制模块202还设置为：在显示阶段向数据线提供像素电压信号。公共电极控制模块203还设置为：在显示阶段向公共电极提供公共电压信号。但是本发明对此不作限制。在其他实施例中，控制电路可以只具备控制触控检测的功能。也就是说，控制电路只要能够在触控阶段起到使由数据线和公共电极构成的寄生电容无法被充电即可。
在本发明一优选的实施例中，第一控制信号、第二控制信号或者第三控制信号为脉冲信号或者阶梯信号。但是，本发明对第一控制信号、第二控制信号或第三控制信号的形式不作限制。即第一控制信号、第二控制信号或者第三控制信号也可以不是脉冲信号。
本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
虽然本发明所公开的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所公开的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (12)

  1. 一种触控显示装置，包括：
    公共电极；
    阵列基板，其具有栅极线、数据线和薄膜晶体管；以及
    控制电路，其在触控阶段向所述栅极线提供用于使所述薄膜晶体管截止的第一控制信号，向所述数据线提供第二控制信号，并向所述公共电极提供第三控制信号；所述第二控制信号的幅值、频率和相位分别与所述第三控制信号的幅值、频率和相位对应相同。
  2. 根据权利要求1所述的触控显示装置，其中，所述第一控制信号、所述第二控制信号或者所述第三控制信号为脉冲信号。
  3. 根据权利要求1所述的触控显示装置，其中，
    所述控制电路，还在显示阶段向所述栅极线提供显示控制信号，向所述数据线提供像素电压信号，并向所述公共电极提供公共电压信号。
  4. 根据权利要求3所述的触控显示装置，其中，所述第一控制信号、所述第二控制信号或者所述第三控制信号为脉冲信号。
  5. 一种用于控制触控显示装置的方法，包括：
    在触控阶段，向所述触控显示装置的栅极线提供用于使该触控显示装置的薄膜晶体管截止的第一控制信号，向所述触控显示装置的数据线提供第二控制信号，并向所述触控显示装置的公共电极提供第三控制信号；
    其中，所述第二控制信号的幅值、频率和相位分别与所述第三控制信号的幅值、频率和相位对应相同。
  6. 根据权利要求5所述的方法，其中，所述第一控制信号、所述第二控制信号或者所述第三控制信号为脉冲信号。
  7. 根据权利要求5所述的方法，其中，还包括：
    在显示阶段，向所述栅极线提供显示控制信号，向所述数据线提供像素电压信号，并向所述公共电极提供公共电压信号。
  8. 根据权利要求7所述的方法，其中，所述第一控制信号、所述第二控制信号或者所述第三控制信号为脉冲信号。
  9. 一种用于控制触控显示装置的电路，包括：
    栅极线控制模块，在触控阶段向所述触控显示装置的栅极线提供用于使该触控显示装置的薄膜晶体管截止的第一控制信号；
    数据线控制模块，在所述触控阶段向所述触控显示装置的数据线提供第二控制信号；
    公共电极控制模块，在所述触控阶段向所述触控显示装置的公共电极提供第三控制信号；
    其中，所述第二控制信号的幅值、频率和相位分别与所述第三控制信号的幅值、频率和相位对应相同。
  10. 根据权利要求9所述的电路，其中，所述第一控制信号、所述第二控制信号或者所述第三控制信号为脉冲信号。
  11. 根据权利要求9所述的电路，其中，
    所述栅极线控制模块还在显示阶段向所述栅极线提供显示控制信号；
    所述数据线控制模块还在所述显示阶段向所述数据线提供像素电压信号；
    所述公共电极控制模块还在所述显示阶段向所述公共电极提供公共电压信号。
  12. 根据权利要求11所述的电路，其中，所述第一控制信号、所述第二控制信号或者所述第三控制信号为脉冲信号。
PCT/CN2015/081849 2015-05-26 2015-06-18 触控显示装置及其控制方法、电路 Ceased WO2016187912A1 (zh)

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