WO2014205951A1 - 一种触摸驱动电路、液晶面板及其驱动方法 - Google Patents

一种触摸驱动电路、液晶面板及其驱动方法 Download PDF

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Publication number
WO2014205951A1
WO2014205951A1 PCT/CN2013/084921 CN2013084921W WO2014205951A1 WO 2014205951 A1 WO2014205951 A1 WO 2014205951A1 CN 2013084921 W CN2013084921 W CN 2013084921W WO 2014205951 A1 WO2014205951 A1 WO 2014205951A1
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Prior art keywords
level
control unit
unit
initialization
signal line
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PCT/CN2013/084921
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English (en)
French (fr)
Inventor
吴博
祁小敬
谭文
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京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Priority to US14/429,525 priority Critical patent/US9529468B2/en
Publication of WO2014205951A1 publication Critical patent/WO2014205951A1/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
    • 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
    • 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
    • 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
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • 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
    • 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
    • G02F1/13312—Circuits comprising photodetectors for purposes other than feedback
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements

Definitions

  • Touch screen (T3 ⁇ 4 uc h Screen Panel, TSP) integrated in the liquid crystal box TSP in Cell technology is to make the touch screen sensor (Sensor) and its driving circuit on the array substrate by Array process. Integrating the TSP Sensor into the LCD panel DCi of the Liquid Crystal Display LCD panel allows for thinner and lighter functions, and more effective etch screen reliability.
  • TFT Thin-Fiim Transistor thin film transistor
  • VINI' is an initialization level
  • OUPUT' is a data readout line.
  • Each row of pixels in the liquid crystal panel is provided with a row of initialization signal lines for driving each touch driving circuit through the VINI', and each column of pixels is provided with a column of data readout lines, and the touch signals are read through the OUTPUT.
  • the existing process uses UTPS (Low Temperature Poly Silicon) technology to fabricate the panel circuit.
  • UTPS Low Temperature Poly Silicon
  • the uniformity of the components produced by the process is poor, resulting in inconsistent level gain of the amplifying transistors of the respective etch driving circuits, under the same touch condition.
  • the size of the touch signal that is amplified and output is different, which causes an error in reading the etched signal.
  • the embodiment of the invention provides an etch driving circuit, a liquid crystal panel and a driving method thereof, which are used for solving the error problem when reading a touch signal and improving the reliability of the etch screen.
  • a touch driving circuit provided by an embodiment of the present invention includes a photoelectric generating unit, an amplifying unit, an output control unit, and an amplification control unit.
  • the photoelectric generating unit is connected to the initialization signal.
  • the amplification control unit is connected between the pixel gate scanning signal line of the row and the pixel scanning signal line of the previous row, and is connected to the photoelectric generating unit, the amplifying unit and the output control unit;
  • the pixel gate scan signal of the line is at a first level, and when the pixel scan signal of the previous row is at a second level, the level of the initialization signal line is received by the photoelectric generating unit, wherein the initializing signal line is first input to the first level.
  • the initialization level such that the level of the connection point of the amplification control unit and the amplification unit is the sum of the initialization level and the on-voltage of the amplification unit; and the scanning signal for the pixel gate in the row is the second level, The pixel scan signal of the previous row is the second level.
  • the output control unit is connected between the data output line and the amplifying unit, and is connected to the pixel scanning signal line of the previous row; for scanning the pixel gate of the line
  • the signal is at a second level, the previous row of pixel gate scan signals is at a first level, and when the initialization signal line is input to an initialization level, the output current of the amplification unit is output to the data output line; wherein, the size of the initialization level is Between the first level and the second level.
  • Embodiments of the present invention provide a liquid crystal panel including a pixel unit, and further including the touch driving circuit.
  • the driving method of the liquid crystal panel includes: the pixel gate scanning signal line of the row is input to the first level, the pixel scanning signal line of the previous row is input to the second level, and the initializing signal line is first input to the first level. Level, and then input the initialization level, so that the level of the connection point between the amplification control unit and the amplification unit is the sum of the initialization level and the on-voltage of the amplification unit; the pixel gate scanning signal line of the line is input to the second level, The pixel line scanning signal line of the previous row is input to the second level, and the initialization signal line is input to the initialization level.
  • the level of the connection point of the amplification control unit and the amplifying unit is lowered;
  • the polar scan signal line is input to the second level, the upper row of pixel gate scan signal lines are input to the first level, the initialization signal line is input to the initialization level, and the output control unit converts the amplification unit according to the connection point of the amplification control unit and the amplification unit.
  • the output current of the flat output is output to the data output line; wherein the magnitude of the initialization level is between the first level and Between the second level.
  • the present invention connects the amplification control unit and the amplification unit.
  • the level change of the point is the sum of the initialization level and the turn-on voltage of the amplifying unit, so that the current output from the amplifying unit to the output control unit is a function independent of the turn-on voltage of the amplifying unit, and the output current read by the data output line It does not change according to the parameters of the component itself; therefore, the output current read according to the data output line can accurately determine whether the photoelectric generating unit senses the touch.
  • the invention solves the error problem when the touch signal is read, and improves the reliability of the touch screen.
  • FIG. 1 is a schematic diagram of a basic light-sensing etch drive circuit in the prior art
  • FIG. 2 is a schematic diagram of a touch driving circuit according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of another touch driving circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a circuit of a pixel unit integrated with a touch driving circuit according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a display unit array according to an embodiment of the present disclosure.
  • FIG. 6 is a timing chart of driving according to an embodiment of the present invention.
  • FIG. 7 is a diagram showing a level relationship according to an embodiment of the present invention. detailed description
  • the embodiment of the invention provides an etch driving circuit, a liquid crystal panel and a driving method thereof, which are used for solving the error problem when reading the etched signal caused by the difference in the uniformity of the component parameters, and improving the reliability of the touch screen.
  • a touch driving circuit including: a photoelectric generating unit 21, an amplification control unit 22, an amplifying unit 23, and an output control unit 24.
  • the photoelectric generating unit 21 is connected between the initialization signal line VINI and the amplification control unit 22;
  • the amplification control unit 22 is connected between the pixel gate scanning signal line G-II of the row and the pixel gate scanning signal line Gjai of the previous row, and the amplification control unit 22 is connected to the photoelectric generating unit 21 and the amplifying unit 23 Pji is connected, and is connected to the output control unit 24; ⁇
  • the pixel gate scanning signal G__n of the row is at the first level and the pixel gate scanning signal G_ji 1 of the previous row is at the second level
  • the initialization is received by the photoelectric generating unit 21
  • the level of the signal line VINI n where The initialization signal line VINI...ri is first input to the first level, and then the initialization level VINI is input, so that the level of the connection point P...11 of the amplification control unit 22 and the amplification unit 23 is the initialization level and the amplification unit.
  • the initialization level VINI is input to VINI..n, if the photoelectric generating unit does not sense the touch, the level of the connection point of the amplification control unit and the amplifying unit is lowered.
  • the amplifying unit 23 is connected between the initialization signal line VINI....n and the output control unit 24, and is connected to the amplification control unit 22 via the connection point P...n; for the connection point P.
  • the level of .11 outputs a current to the output control unit 24;
  • the output control unit 24 is connected between the data output line DATA...TSP and the amplifying unit 23, and is connected to the previous row of pixel gate scanning signal lines GJ-1; for when the pixel gate scanning signal Gji of the row is the second Level, the upper row pixel gate scan signal Gji-i is at a first level, and when the initialization signal line VINI-n is input to the initialization level VINI, the output current of the amplification unit is output to the data output line DATA_TSP.
  • the initialization level has a magnitude between the first level and the second level.
  • the photo-generation unit 21 includes: a photodiode D1; the two poles of the photodiode D1 are respectively connected to an initialization signal line VINIji and a connection point P_ji of the amplification control unit and the amplification unit.
  • a reverse leakage current can be generated.
  • Di receives light, a large photo-induced current is generated; on the contrary, when ⁇ ) is not exposed to light (ie, When the touch is sensed, Di generates a small photo-induced current because the external light source cannot illuminate D1.
  • the amplifying unit 23 includes: a first transistor T1; a gate of the first transistor T1 is connected to a connection point Pja of the amplification control unit and the amplifying unit, and the other two electrodes are respectively connected to the initialization signal line VINIji and the output control unit 24
  • the pilot voltage of the amplifying unit is the threshold voltage VthJT1 of T1.
  • the amplification control unit 22 includes: a second transistor T2 and a capacitor C1U.
  • the gate of the second transistor T2 is connected to the pixel gate scanning signal line G_ji of the row, and the other two poles are respectively connected to the amplification control unit and the amplification unit.
  • the connection point Pji and the output control unit 24; the two ends of the capacitor C1 are respectively connected to the connection point Pji of the amplification control unit and the amplification unit and the pixel scan signal line G ⁇ -1 of the previous row.
  • the output control unit 24 includes: a third transistor T3; a gate of the third transistor T3 is connected to the pixel scan signal lines G...n1 of the previous row, and the other two electrodes are respectively connected to the data output line DATA.
  • TSP and amplification unit 23 are respectively connected to the data output line DATA.
  • T1, T2, and T3 are ⁇ -type transistors, and the anode of D1 is connected to the initialization signal lines VTNI...n, and the cathode is connected to P....n.
  • T!, ⁇ 2, ⁇ 3 are ⁇ -type transistors, the cathode of D1 is connected to VINI..n, and the anode is connected to P... n .
  • the transistor is a thin film transistor TFT.
  • the first level is an on level of the transistor, and the second level is an off level of the transistor.
  • Embodiments of the present invention also provide a liquid crystal panel including a pixel unit, further including the touch driving circuit.
  • FIG. 4 it is a schematic circuit diagram of a liquid crystal panel provided by an embodiment of the present invention, which includes a pixel unit of the etch driving circuit, which is labeled as TSP_Part; wherein LCDjpart is an existing pixel unit.
  • the DATAJLCD is the data line of the existing pixel unit, and the etch drive circuit portion TSP_Part can use the touch drive circuit of the N-type transistor shown in FIG. 2, or can also use the touch drive of the P-type transistor shown in FIG. Circuit.
  • FIG. 5 it is a schematic diagram of a display unit array of a liquid crystal panel provided by an embodiment of the present invention; wherein the etched driving circuit portion can make the N-type transistor touch circuit shown in FIG. 2 The touch drive circuit of the P-type transistor shown in 3.
  • the horizontal direction indicates the change of each input/output signal with time; the vertical direction indicates the size of the signal.
  • G—n is the pixel gate scan signal of the row; Gji-1 is the pixel scan signal of the previous row; G— ⁇ is the pixel scan signal of the next row; INLn is the initialization signal;
  • ⁇ — ⁇ diagram indicates The level of the connection point Pja in Fig. 2; READ indicates the current output from the drive circuit to the data output line, wherein the higher level indicated by the broken line indicates the level of output when the touch screen is touched, and the lower level of the solid line indicates The level of output when there is no touch screen.
  • the first level is a transistor turn-on level and the second level is a transistor turn-off level.
  • FIG. 6 it is a driving timing chart of the liquid crystal panel when an N-type transistor is used.
  • the conduction level of the pixel gate scanning signal is referred to as a first level (high level) as VDD, and the transistor is turned off.
  • the level is called the second level (low level) and is represented as VSS;
  • the high and low levels of the initialization signal are VDD and VTNI, respectively; wherein the initialization level VINI is between the first level and the second level, That is, VDD>VTNI>VSS, as shown in Figure 7.
  • the first level ⁇ initialization level ⁇ the second level, wherein the first level is a low level VSS and the second level is a high level VDD.
  • the level change of the P...n node is a plurality of values, wherein each value represents: Vth..D The threshold voltage of the photodiode D1; Vth T1 represents the threshold voltage of the first transistor T1; AVJeak represents the level change of P_n after the leakage of the photodiode D1 is ⁇ ; ⁇ -boost represents the first level and the second of the transistor The difference in levels.
  • the parameters not mentioned above represent the same feature quantities as described above.
  • the driving circuit will be described using an N-shaped transistor as shown in Fig. 6 as an example.
  • the action of the driving circuit includes one working phase, which is to initialize the Imt i phase, the sensing phase, and the Read phase, respectively.
  • the driving process is as follows: Initialization phase: The pixel gate of the row The scanning signal line is input to the first level, the upper row of pixel gate scanning signal lines are input to the second level, the initializing signal line is first input to the first level, and then the initialization level is input, so that the connection point of the amplification control unit and the amplifying unit is enlarged The level is the sum of the initialization level and the turn-on voltage of the amplifying unit;
  • Sensing phase The pixel gate scanning signal line of the line is input to the second level, the pixel scanning signal line of the previous row is input to the second level, and the initialization signal line is input to the initialization level. If the photoelectric generating unit does not sense the etch, A larger photo-induced current is generated, such that the level of the connection point P_ji of the amplification control unit and the amplification unit is lowered; conversely, if the photo-generation unit 21 is touched, a smaller photo-induced current is generated, so that the connection point Pja is electrically The level remains unchanged. As can be seen from the graph of P__n in Fig.
  • the dashed line holding the VINI+VthJH level indicates that the level of the connection point P_ji remains unchanged when the touch screen is touched; the solid line that gradually becomes smaller indicates that the touch screen is not touched. At this time, the level of the connection point P-n gradually decreases.
  • Reading phase The pixel gate scanning signal line of the row is input to the second level, the pixel scanning signal line of the previous row is input to the first level, and the initialization signal line is input to the initialization level. At this time, the output control sheet is output.
  • the unit outputs the current outputted according to the level of the connection point to the data output line; the following describes the working principle of the touch drive circuit in combination with the formula and the driving date sequence of FIG. 6.
  • Initialization phase G...n input VDD, G....n 1 input VSS, T2 is on, T3 is off, initially, use VINI....n to charge C1 through D1, P...n
  • the flat size is VDD Vth...D, where Vih...D is the threshold voltage of D1.
  • the level of INI ji jumps to VINI. Since the gate and drain of Tl are both VINI and short-circuited, T1 is equivalent to a diode. At this time, C1 discharges to TNI..11 through T1.
  • the level of P....n is VINI+1 ⁇ 4 h Ti , where V ih ⁇ is the threshold voltage of the amplification transistor T1.
  • the purpose of the initialization phase is to change the level of the connection point ⁇ .. ⁇ of the amplification control unit and the amplification unit to the sum of the initialization level and the threshold voltage of the transistor T1, VINI+V th T1 .
  • Sensing phase This phase takes up most of the time.
  • G__n and G-ni are input to VSS, T2 and ⁇ 3 are cut off, and the touch state of the panel panel is detected by D1.
  • the panel of the corresponding area of D1 is touched by a finger (With l3 ⁇ 4iich)
  • the external light source cannot be irradiated to D1
  • D1 receives less light
  • the light induced leakage current is small
  • the P-n level hardly changes
  • the level is still ⁇ . + ⁇ ⁇ ⁇ 1 .
  • the external light source can be irradiated to Di, and D1 receives light, resulting in a large photo-induced leakage current.
  • Reading phase In this phase, the amplifying transistor Ti is biased to the saturation amplification region where the gain is the largest, and the peripheral readout circuit reads out the detection result when the Gji-1 is input to VDD.
  • G-n-i ⁇ VSS jumps to VDD, that is, ⁇ VBOOST-VDD-VSS, and the gate level of the amplifying transistor T1, that is, the level of Pji is VINI+Vth xi- ⁇ V LEAK + ⁇ V B ⁇ ST .
  • the amplification current IDSJH output from T1 to T3 is: s - K - (vim + v lh Ti ⁇ AV LEAK + AV B00S7 ⁇ v tk ri f
  • ⁇ is a constant. Since the level of P...n is pre-adjusted in the initialization phase, the resulting transistor T1 amplifies the output current formula, eliminating the influence of Vih...Tl. Therefore, the DATA...TSP is read to different current sizes under the same etch scene, and the reliability of the read amplified signal is improved.
  • the embodiments of the present invention provide a touch driving circuit, a liquid crystal panel, and a driving method thereof, which are used to solve the error of a touch signal caused by a component parameter, that is, a transistor threshold voltage uniformity difference, and improve the reliability of the touch screen.
  • a component parameter that is, a transistor threshold voltage uniformity difference

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  • Human Computer Interaction (AREA)
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  • Crystallography & Structural Chemistry (AREA)
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  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Position Input By Displaying (AREA)
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  • Liquid Crystal Display Device Control (AREA)
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Abstract

提供了一种触摸驱动电路、液晶面板及其驱动方法，用于解决触摸驱动电路中元器件参数均一性差导致的误差问题，提高触摸屏可靠性。该触摸驱动电路包括：光电产生单元（21）、放大单元（23）、输出控制单元（24）和放大控制单元（22）。

Description

触摸屏 (T¾uch Screen Panel, TSP)集成在液晶盒内 TSP in Cell技术是将触 摸屏的感应器 (Sensor)及其驱动电路， 利用阵列 (Array)工艺制作在阵列基板 上。将 TSP Sensor集成于液晶显示屏 (Liquid Crystal Display LCD)面板液晶盒 LCD Panel ceii内部， 可以使产品轻薄化， 功能多样化， 并有效提高蝕摸屏可 靠性。
图 1是现有技术中的基本光感应式触摸驱动电路， Sensor采用光电二极 管 D'感应光照， 产生漏电来检测触摸信号。 TFT(Thin-Fiim Transistor 薄膜晶 体管） T'作为放大晶体管， 用于增强蝕摸驱动电路输出驱动能力， 供 TSP外 部读出电路正确读取检测结果。 该电路存在于液晶盒内的每一像素， 其中， VINI'为初始化电平， OUPUT'为数据读出线。 液晶面板内每一行像素设置有 一行初始化信号线，用于通过 VINI'驱动各个触摸驱动电路，每一列像素设置 有一列数据读出线， ^于通过 OUTPUT读取触摸信号。
现有工艺是使用 UTPS(Low Temperature Poly Silicon,低温多晶硅)技术制 作面板电路， 该工艺生产出来的元器件参数均一性差， 导致各个蝕摸驱动电 路的放大晶体管的电平增益不一致， 相同触摸情况下经过放大输出的触摸信 号大小不同， 从而造成读取蝕摸信号时存在误差。
本发明实施例提供了一种蝕摸驱动电路、 液晶面板及其驱动方法， 用于 解决读取触摸信号时的误差问题， 提高蝕摸屏可靠性。
本发明实施例提供的一种触摸驱动电路， 包括光电产生单元、放大单元、 输出控制单元和放大控制单元； 其中， 所述光电产生单元连接于初始化信号 线和放大控制单元之间， 放大控制单元连接于本行像素栅极扫描信号线和上 一行像素栅极扫描信号线之间， 并且与光电产生单元、 放大单元和输出控制 单元相连； 用于当本行像素栅极扫描信号为第一电平， 上一行像素栅极扫描 信号为第二电平时， 通过光电产生单元接收初始化信号线的电平， 其中， 初 始化信号线先输入第一电平， 再输入初始化电平， 使得放大控制单元与放大 单元的连接点的电平为初始化电平与放大单元的导通电压的和； 以及用于在 本行像素栅极扫描信号为第二电平， 上一行像素栅极扫描信号为第二电平， 初始化信号线输入初始化电平时， 若光电产生单元没有感应到触摸， 降低放 大控制单元与放大单元的连接点的电平； 放大单元连接于初始化信号线和输 出控制单元之间， 并且与放大控制单元通过所述连接点相连； 用于根据所述 连接点的电平向输出控制单元输出电流； 输出控制单元连接于数据输出线和 放大单元之间， 并且与上一行像素栅极扫描信号线相连； 用于当本行像素栅 极扫描信号为第二电平， 上一行像素栅极扫描信号为第一电平， 初始化信号 线输入初始化电平时， 将放大单元的输出电流输出至数据输出线； 其中， 所 述初始化电平的大小介于第一电平与第二电平之间。
本发明实施例提供了一种液晶面板， 包括像素单元， 还包括所述触摸驱 动电路。
本发明实施例提供的所述液晶面板的驱动方法包括： 本行像素栅极扫描 信号线输入第一电平， 上一行像素栅极扫描信号线输入第二电平， 初始化信 号线先输入第一电平， 再输入初始化电平， 使得放大控制单元与放大单元的 连接点的电平为初始化电平与放大单元的导通电压的和； 本行像素栅极扫描 信号线输入第二电平， 上一行像素栅极扫描信号线输入第二电平， 初始化信 号线输入初始化电平， 若光电产生单元没有感应到蝕摸， 放大控制单元与放 大单元的连接点的电平降低； 本行像素栅极扫描信号线输入第二电平， 上一 行像素栅极扫描信号线输入第一电平， 初始化信号线输入初始化电平， 输出 控制单元将放大单元根据放大控制单元与放大单元的连接点的电平输出的电 流输出至数据输出线； 其中， 所述初始化电平的大小介于第一电平与第二电 平之间。
通过以上技术方案可知， 本发明通过将放大控制单元与放大单元的连接 点的电平变化为初始化电平与放大单元的导通电压的和， 使得放大单元向输 出控制单元输出的电流是一个与放大单元的导通电压无关的函数， 数据输出 线读取的输出电流不会根据元器件本身参数的不同而发生变化； 因此根据数 据输出线读取的输出电流能够准确判断出光电产生单元是否感应到触摸。 本 发明解决触摸信号读取时的误差问题， 提高了触摸屏可靠性。 附图说明
图 1为现有技术中的基本光感应式蝕摸驱动电路示意图；
图 2为本发明实施例提供的触摸驱动电路示意图；
图 3为本发明实施例提供的另一触摸驱动电路示意图；
图 4 为本发明实施例提供的集成了触摸驱动电路的像素单元电路示意 图；
图 5为本发明实施例提供的显示单元阵列示意图；
图 6为本发明实施例提供的驱动时序图；
图 7为本发明具体实施例提供的电平大小关系图。 具体实施方式
本发明实施例提供了一种蝕摸驱动电路、 液晶面板及其驱动方法， 用于 解决元器件参数均一性差导致的读取蝕摸信号时的误差问题， 提高触摸屏可 靠性。
首先参见图 2， 描述本发明实施例提供的触摸驱动电路， 包括： 光电产 生单元 21、 放大控制单元 22、 放大单元 23和输出控制单元 24。
所述光电产生单元 21连接于初始化信号线 VINI和放大控制单元 22之 间；
放大控制单元 22连接于本行像素栅极扫描信号线 G— II和上一行像素栅 极扫描信号线 Gja i之间， 并且所述放大控制单元 22与光电产生单元 21和 放大单元 23在连接点 Pji连接， 并且与输出控制单元 24相连； ^于当本行 像素栅极扫描信号 G__n为第一电平， 上一行像素栅极扫描信号 G_ji 1 为第二 电平时， 通过光电产生单元 21接收初始化信号线 VINI n的电平， 其中， 初 始化信号线 VINI...ri先输入第一电平， 再输入初始化电平 VINI， 使得放大控 制单元 22与放大单元 23的连接点 P...11的电平为初始化电平与放大单元的导 通电压的和； 以及用于在本行像素栅极扫描信号 G...n为第二电平， 上一行像 素栅极扫描信号 G...n l 为第二电平， 初始化信号线 VINI..n输入初始化电平 VINI时， 若光电产生单元没有感应到触摸， 降低放大控制单元与放大单元的 连接点 Ρ...Π的电平。 放大单元 23连接于初始化信号线 VINI....n和输出控制单 元 24之间， 并 i与放大控制单元 22通过所述连接点 P...n相连； 用于根据所 述连接点 P...11的电平向输出控制单元 24输出电流；
输出控制单元 24连接于数据输出线 DATA...TSP和放大单元 23之间， 并 且与上一行像素栅极扫描信号线 G.J -1相连； 用于当本行像素栅极扫描信号 Gji为第二电平， 上一行像素栅极扫描信号 Gji-i为第一电平， 初始化信号 线 VINI— n输入初始化电平 VINI时， 将放大单元的输出电流输出至数据输出 线 DATA— TSP。
其中， 所述初始化电平的大小介于第一电平与第二电平之间。
较佳的， 所述光电产生单元 21包括： 光电二极管 D1 ; 所述光电二极管 D1的两极分别连接初始化信号线 VINIji和所述放大控制单元与放大单元的 连接点 P_ji。 其中， Di在光照下时 （即未感应到触摸时） 能够产生反向的漏 电流， 此时， 由于 Di受光， 所以产生较大的光感应电流； 相反， 当 Ε)Γ在不 受光（即感应到触摸时）， 由于外部光源不能照射到 D1 , 所以 Di产生较小的 光感应电流。
较佳的， 所述放大单元 23包括： 第一晶体管 T1 ; 第一晶体管 T1的栅极 连接所述放大控制单元与放大单元的连接点 Pja, 另外两极分别连接初始化 信号线 VINIji和输出控制单元 24;所述放大单元的导遥电压即为 T1的阈值 电压 VthJTl。
较佳的， 所述放大控制单元 22包括： 第二晶体管 T2和电容 C1U 第二晶 体管 T2的栅极连接本行像素栅极扫描信号线 G_ji,另外两极分别连接所述放 大控制单元与放大单元的连接点 Pji和输出控制单元 24; 所述电容 C1的两 端分别连接所述放大控制单元与放大单元的连接点 Pji和上一行像素栅极扫 描信号线 G η- 1。 较佳的， 所述输出控制单元 24包括： 第三晶体管 T3 ; 第三晶体管 T3的 栅极与上一行像素栅极扫描信号线 G...n 1连接， 另外两极分别连接数据输出 线 DATA.. TSP和放大单元 23。
图 2中， Tl、T2、T3为 Ν型晶体管， D1的阳极连接初始化信号线 VTNI...n, 阴极连接 P....n。 本发明提供的另一种实施例如图 3所示， T!、 Τ2、 Τ3为 Ρ型 晶体管， D1的阴极连接 VINI..n， 阳极连接 P...n。
较佳的， 所述晶体管为薄膜晶体管 TFT。
较佳的， 所述第一电平为晶体管的导通电平， 第二电平为晶体管的截止 电平。
本发明的实施例还提供了一种液晶面板， 包括像素单元， 还包括所述触 摸驱动电路。
如图 4所示， 是本发明实施例提供的液晶面板的电路示意图， 其中包括 了所述蝕摸驱动电路的像素单元， 图中标注为 TSP— Part; 其中， LCDjpart为 现有的像素单元， DATAJLCD为现有的像素单元的数据线， 蝕摸驱动电路部 分 TSP— Part可以使用图 2中所示的 N型晶体管的触摸驱动电路，也可以使用 图 3中所示的 P型晶体管的触摸驱动电路。
如图 5所示，是本发明实施例提供的液晶面板的显示单元阵列的示意图； 其中的蝕摸驱动电路部分可以使 ^图 2中所示的 N型晶体管触摸电路， 也可 以使 ^如图 3所示的 P型晶体管的触摸驱动电路。
下面结合附图 2和 ^图 6对本发明实施例提供的触摸驱动电路在工作时 的动作进行描述。
如图 6所示， 水平方向表示随时间的推移各个输入 /输出信号的变化； 竖 直方向表示信号的大小。 G— n为本行像素栅极扫描信号； Gji-1 为上一行像 素栅极扫描信号； G— η·Η为下一行像素栅极扫描信号； INLn为初始化信号； Ρ—η图表表示的是图 2中连接点 Pja的电平； READ表示该驱动电路向数据 输出线输出的电流， 其中虚线表示的较高电平表示当触摸屏被触摸时输出的 电平， 实线较低的电平表示当没有触摸蝕摸屏时输出的电平。
在以下描述中， 较佳的， 第一电平为晶体管导通电平， 第二电平为晶体 管截止电平。 如图 6所示， 是使用 N型晶体管时液晶面板的驱动时序图， 以下将像素 栅极扫描信号的导通电平称为第一电平（高电平）表示为 VDD， 将晶体管的 截止电平称第二电平 （低电平） 表示为 VSS ; 初始化信号的高低电平分别为 VDD和 VTNI; 其中， 初始化电平 VINI的大小介于上述第一电平和第二电平 之间， 即 VDD>VTNI>VSS， 如图 7所示。 当采用 P型晶体管时， 触摸驱动电 路的驱动时序中， 第一电平<初始化电平 <第二电平， 其中第一电平为低电平 VSS , 第二电平为高电平 VDD。
再参照图 6中的 P ..n图表， 从图中可以看出， P...n结点的电平变化为多 个值， 其中每个值所表示的分别为： Vth..D表示光电二极管 D1的阈值电压； Vth T1 表示第一晶体管 T1 的阈值电压； AVJeak表示经过光电二极管 D1 漏电后 P—n的电平变化量为 Δ； ΔΥ— boost表示晶体管的第一电平与第二电平 之差。 上述未提及的参数则表示与前文所描述的相同的特征量。
下面， 以图 6中所示的， 使用 N形晶体管形成所述驱动电路为例进行说 明。 在每帧 (Frame)的时间内， 驱动电路的动作包括≡个工作阶段， 分别是初 始化 Imt i阶段、 感测 ΓΉΟΤΟ阶段、 读取 Read阶段， 其驱动过程如下： 初始化阶段： 本行像素栅极扫描信号线输入第一电平， 上一行像素栅极 扫描信号线输入第二电平， 初始化信号线先输入第一电平， 再输入初始化电 平， 使得放大控制单元与放大单元的连接点的电平为初始化电平与放大单元 的导通电压的和；
感测阶段： 本行像素栅极扫描信号线输入第二电平， 上一行像素栅极扫 描信号线输入第二电平， 初始化信号线输入初始化电平， 若光电产生单元没 有感应到蝕摸， 则产生较大的光感应电流， 使得放大控制单元与放大单元的 连接点 P_ji的电平降低； 相反， 如果光电产生单元 21被触摸， 则产生较小的 光电感应电流， 使得连接点 Pja的电平保持不变。 从图 6中， P__n的图表中 可以看出， 在这个阶段， 保持 VINI+VthJH水平的虚线表示触摸触摸屏时， 连接点 P_ji的电平一直保持不变； 逐渐变小的实线表示未触摸触摸屏时， 连 接点 P—n的电平逐渐降低。
读取阶段： 本行像素栅极扫描信号线输入第二电平， 上一行像素栅极扫 描信号线输入第一电平， 初始化信号线输入初始化电平， 此时， 输出控制单 元将放大单元根据所述连接点的电平输出的电流输出至数据输出线； 下面结 合公式和图 6的驱动日寸序对所述触摸驱动电路的工作原理迸行迸一步说明。
初始化阶段： G...n输入 VDD， G....n 1输入 VSS , T2导通， T3截止， 最 初， 使用 VINI....n通过 D1 向 C1充电， P...n的电平大小为 VDD Vth...D， 其 中， Vih...D是 D1的阈值电压。 然后， INI ji的电平跳变为 VINI， 由于 Tl的 栅极与漏极均为 VINI, 形成短接， 所以此时 T1等效为二极管， 这时， C1通 过 T1向 TNI..11放电， 直至 P....n电平大小为 VINI+¼h Ti， 其中， Vih Τί为放大 晶体管 Tl的阈值电压。初始化阶段的目的即为将所述将放大控制单元与放大 单元的连接点 Ρ....Ώ 的电平变化为初始化电平与晶体管 T1 阈值电压的和 VINI+Vth T1。
感测阶段： 该阶段占用一 中的大部分时间， G__n、 G— n i均输入 VSS， T2、 Τ3截止， 通过 D1检测面板 Panel的触摸状态。 当 D1对应区域的面板被 手指触摸（With l¾iich)， 则外部光源无法照射到 Dl， 则 D1的受光较少， 光 感应漏电流小， P—n电平几乎没有变化,电平大小仍为 νΐΝΙ+νΛ ΐ1。 当面板未 被手指蝕摸（Without T ucb ) , 则外部光源可以照射到 Di， 则 D1受光， 产生 较大的光感应漏电流。 假设经过光电二极管 D1漏电后 P__n的电平变化量为 A VLEAK, 则没有触摸面板时， 经过光电二极管 D1漏电后， 连接点 Pja的电 平变为 VINI+Vih n- A VLEAK。
读取阶段： 在该阶段中， 放大晶体管 Ti偏置于增益最大的饱和放大区， 外围读出电路在 Gji- 1输入 VDD时读出检测结果。 G— n- 1输入 VDD， G__n 输入 VSS , T2截止， T3导通， T1工作在饱和放大区， 将 ΤΠ放大的电流输 出至 DATA— TSP。在这个阶段的开始时刻， G— n- i ί VSS跳变为 VDD, 即 Δ VBOOST-VDD-VSS, 则读出阶段放大晶体管 T1 的栅极电平即 Pji 的电平为 VINI+Vth xi- Δ VLEAK+ Δ VB∞ST。 根据饱和放大区晶体管栅极电平与输出电流 的关系公式， 得到 T1向 T3输出的放大电流 IDSJH为： s - K - (vim + vlh Ti― AVLEAK+AVB00S7~vtk rif
：:: + (丽 +Δ
其中， Κ为常数。 由于在初始化阶段对 P...n的电平进行预先调整， 使得最终得到的晶体管 T1放大输出的电流公式中， 消除了 Vih...Tl 的影响。 因此， 避免了相同蝕摸 场景下， DATA...TSP读取到不同的电流大小的情况， 提高了读取的放大信号 的可靠性。
综上所述， 本发明实施例提供了一种触摸驱动电路、 液晶面板及其驱动 方法， 用于解决元器件参数即晶体管阈值电压均一性差导致的触摸信号的误 差问题， 提高触摸屏可靠性。
显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本 发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

1. 一种触摸驱动电路， 其特征在于， 包括： 光电产生单元、 放大控制单 元、 放大单元和输出控制单元； 其中，
所述光电产生单元连接于初始化信号线和放大控制单元之间，
放大控制单元连接于本行像素栅极扫描信号线和上一行像素栅极扫描信 号线之间， 并且与光电产生单元、 放大单元和输出控制单元相连； 用于当本 行像素栅极扫描信号为第一电平， 上一行像素栅极扫描信号为第二电平时， 通过光电产生单元接收初始化信号线的电平， 其中， 初始化信号线先输入第 一电平， 再输入初始化电平， 使得放大控制单元与放大单元的连接点的电平 为初始化电平与放大单元的导通电压的和； 以及用于在本行像素栅极扫描信 号为第二电平， 上一行像素栅极扫描信号为第二电平， 初始化信号线输入初 始化电平时， 若光电产生单元没有感应到触摸， 降低放大控制单元与放大单 元的连接点的电平；
放大单元连接于初始化信号线和输出控制单元之间， 并—且.与放大控制单 元通过所述连接点相连； 用于根据所述连接点的电平向输出控制单元输出电 流；
输出控制单元连接于数据输出线和放大单元之间， 并且与上一行像素栅 极扫描信号线相连； 用于当本行像素栅极扫描信号为第二电平， 上一行像素 栅极扫描信号为第一电平， 初始化信号线输入初始化电平时， 将放大单元的 输出电流输出至数据输出线；
其中， 所述初始化电平的大小介于第一电平与第二电平之间。
2. 如权利要求 1所述的电路， 其特征在于， 所述光电产生单元包括： 光 电二极管； 所述光电二极管的两极分别连接初始化信号线和所述放大控制单 元与放大单元的连接点。
3. 如权利要求 1所述的电路， 其特征在于， 所述放大单元包括： 第一晶 体管； 第一晶体管的栅极连接所述放大控制单元与放大单元的连接点， 另外 两极分别连接初始化信号线和输出控制单元。
4. 如权利要求 1所述的电路， 其特征在于， 所述放大控制单元包括： 第 二晶体管和电容；
第二晶体管的栅极连接本行像素栅极扫描信号线， 另外两极分别连接所 述放大控制单元与放大单元的连接点和输出控制单元；
所述电容的两端分别连接所述放大控制单元与放大单元的连接点和上一 行像素栅极扫描信号线。
5. 如权利要求 1所述的电路， 其特征在于， 所述输出控制单元， 包括： 第三晶体管；
第三晶体管的栅极与上一行像素栅极扫描信号线连接， 另外两极分别连 接数据输出线和放大单元。
6. 如权利要求 2 5任一权项所述的电路， 其特征在于， 所述第一电平为 晶体管的导通电平， 第二电平为晶体管的截止电平。
7. —种液晶面板， 包括像素单元， 其特征在于， 还包括权利要求 1-6所 述的触摸驱动电路。
8. 一种如权利要求 7所述的液晶面板的驱动方法， 其特征在于， 该方法 包括：
本行像素栅极扫描信号线输入第一电平， 上一行像素栅极扫描信号线输 入第二电平， 初始化信号线先输入第一电平， 再输入初始化电平， 使得放大 控制单元与放大单元的连接点的电平为初始化电平与放大单元的导通电压的 和；
本行像素栅极扫描信号线输入第二电平， 上一行像素栅极扫描信号线输 入第二电平， 初始化信号线输入初始化电平， 若光电产生单元没有感应到触 摸， 放大控制单元与放大单元的连接点的电平降低；
本行像素栅极扫描信号线输入第二电平， 上一行像素栅极扫描信号线输 入第一电平， 初始化信号线输入初始化电平， 输出控制单元将放大单元根据 所述连接点的电平输出的电流输出至数据输出线；
其中， 所述初始化电平的大小介于第一电平与第二电平之间。
9.如权利要求 8所述的方法，其特征在于，第一电平为晶体管导通电平, 第二电平为晶体管截止电平。
PCT/CN2013/084921 2013-06-26 2013-10-09 一种触摸驱动电路、液晶面板及其驱动方法 WO2014205951A1 (zh)

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