WO2019019322A1 - Panneau d'affichage à commande tactile et procédé d'affichage et dispositif d'affichage associé - Google Patents

Panneau d'affichage à commande tactile et procédé d'affichage et dispositif d'affichage associé Download PDF

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Publication number
WO2019019322A1
WO2019019322A1 PCT/CN2017/102653 CN2017102653W WO2019019322A1 WO 2019019322 A1 WO2019019322 A1 WO 2019019322A1 CN 2017102653 W CN2017102653 W CN 2017102653W WO 2019019322 A1 WO2019019322 A1 WO 2019019322A1
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WO
WIPO (PCT)
Prior art keywords
voltage
common electrode
touch display
display panel
amount
Prior art date
Application number
PCT/CN2017/102653
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English (en)
Chinese (zh)
Inventor
邢振周
Original Assignee
武汉华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 武汉华星光电技术有限公司 filed Critical 武汉华星光电技术有限公司
Publication of WO2019019322A1 publication Critical patent/WO2019019322A1/fr

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Classifications

    • 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
    • G06F3/0412—Digitisers structurally integrated in a display

Definitions

  • the present invention relates to the field of terminal display, and in particular to a touch display panel, a display method, and a display device.
  • the afterimage is a common phenomenon in the display of the touch display panel, and it is also a very important test link in the reliability test.
  • afterimages can be divided into long-term afterimages and short-term afterimages, and the physical mechanisms of their occurrence are not the same. The most common ones are long-term afterimages. Long-term afterimages are caused by DC residuals.
  • FIG. 1 is a schematic diagram of driving sequence of a touch display panel in the prior art. As shown in FIG.
  • the common electrode voltage is a constant DC voltage in the display timing phase, that is, a voltage difference formed between the liquid crystal layer and the pixel electrode, thereby being used for gray scale display; and the common electrode voltage is an AC square wave in the touch scanning phase. Its role is for touch panel scanning.
  • the voltage at the common electrode terminal changes. Assume that the preset common voltage value is VCOM1. When positive ions are accumulated on the VCOM electrode, the common voltage value at this time becomes larger, and the changed common voltage is VCOM3, that is, VCOM3>VCOM1; when negative ions are accumulated on the common electrode, the common voltage value at this time becomes small, and the common voltage after the change is VCOM2, that is, VCOM2 ⁇ VCOM1.
  • An object of the present invention is to provide a display method for a touch display panel, which solves the technical problem that the touch display panel is prone to residual images in the prior art, resulting in poor display quality.
  • a technical solution adopted by the present invention is to provide a display method of a touch display panel
  • the touch display panel includes a plurality of pixel electrodes, and one end of the pixel electrode is connected to the touch a thin film transistor output end of the display panel, the other end of the pixel electrode is connected to the common electrode, the thin film transistor input end is connected to the data line, and the control end of the thin film transistor is connected to the scan line
  • the display method The method includes: when the touch display panel is in a display phase, the common electrode drives the pixel electrode by using a first DC voltage; and detecting whether the amount of charge accumulated on a side corresponding to the common electrode exceeds a preset threshold; The amount of charge accumulated on one side of the common electrode exceeds the predetermined threshold, and the common electrode drives the touch display panel by a second DC voltage in a next display phase, wherein the second DC voltage a difference between the first DC voltage and the amount of charge generated in the display phase and the accumulated electricity of the common electrode
  • a touch display panel which includes an array substrate, a color filter substrate, and an array substrate and a substrate disposed opposite to each other.
  • a liquid crystal layer between the color filter substrates the array substrate includes a plurality of pixel electrodes, one end of the pixel electrode is connected to a thin film transistor output end of the touch display panel, and the other end of the pixel electrode is connected to a common An electrode, the thin film transistor input end is connected to the data line, the control end of the thin film transistor is connected to the scan line, the touch display panel further includes a control circuit and a driving circuit, and a segment of the driving circuit is connected to the control a further circuit connected to the common electrode; the driving circuit, when the control circuit detects that the touch display panel is in the display phase, outputs a first DC voltage to the common electrode to drive the pixel electrode; The control circuit, when the control circuit detects that the amount of charge accumulated on the side corresponding to the common electrode exceeds
  • another technical solution adopted by the present invention is to provide a touch display device, which includes the above touch display panel to implement the steps in the above method.
  • the present invention changes the common electrode voltage of a constant DC voltage in the display phase, and neutralizes the accumulated charge on the side of the common electrode by continuously changing the voltage, thereby improving the touch display.
  • the residual image of the panel improves the display quality.
  • FIG. 1 is a schematic diagram of driving sequence of a touch display panel in the prior art
  • FIG. 3 is a schematic flow chart of an embodiment of a display method of a touch display panel provided by the present invention.
  • FIG. 4 is a schematic diagram of an embodiment of a display method of a touch display panel provided by the present invention.
  • FIG. 5 is a schematic diagram of another embodiment of a display method of a touch display panel provided by the present invention.
  • FIG. 6 is a schematic structural diagram of an embodiment of a touch display panel provided by the present invention.
  • FIG. 7 is a schematic diagram showing the circuit connection of an embodiment of the touch display panel provided by the present invention.
  • FIG. 3 is a schematic flow chart of an embodiment of a display method of a touch display panel provided by the present invention.
  • the touch display panel is an In-cell touch display panel.
  • the touch display panel includes a plurality of pixel electrodes, one end of the pixel electrode is connected to the thin film transistor output end of the touch display panel, the other end of the pixel electrode is connected to the common electrode, and the thin film transistor input terminal is connected To the data line, the control terminal of the thin film transistor is connected to the scan line.
  • Step 301 When the touch display panel is in the display phase, the common electrode drives the pixel electrode by using a first DC voltage.
  • the touch display panel integrates the touch electrode with the touch function and the pixel electrode with the display function, and realizes the dual functions of touch and display through time division multiplexing. And the driving voltage and type required for the touch function and the display function are different. In order to ensure that the voltage difference across the pixel electrode is equal, in the display phase, generally driven by a stable DC voltage, correspondingly, the common electrode terminal also needs a stable DC voltage to drive.
  • the first DC voltage is VCOM1, that is, the pixel electrode is driven by a common voltage of VCOM1.
  • Step 302 Detect whether the amount of charge accumulated on a side corresponding to the common electrode exceeds a preset threshold.
  • Step 303 If the amount of charge accumulated on the side corresponding to the common electrode exceeds the preset threshold, the common electrode drives the touch display panel through the second DC voltage in the next display stage, where The difference between the second DC voltage and the first DC voltage is the same as the amount of charge accumulated in the display electrode and the amount of charge accumulated in the common electrode, and the polarity is opposite.
  • the charge is formed by accumulating for a period of time. During a period of time, the charge backlog is not too obvious. In order to ensure the display quality, the compensation efficiency is further improved, and resources are saved.
  • the embodiment counts the amount of charge accumulated on one side of the common electrode, and starts the compensation measure when the preset threshold is exceeded.
  • the current does not change significantly when the general driving voltage is constant, because the amount of charge accumulated on the side corresponding to the common electrode can be determined by time.
  • the touch display panel determines whether the current common electrode drives the pixel electrode by the first DC voltage for more than a preset time. If the preset time is exceeded, it may be determined that the amount of charge accumulated on the side corresponding to the common electrode exceeds a preset threshold.
  • the common electrode drives the touch display panel by a second DC voltage in a next display phase, wherein a difference between the second DC voltage and the first DC voltage is generated by the amount of charge generated during the display phase.
  • the amount of charge accumulated by the common electrode is the same and the polarity is opposite.
  • the preset time is 1 second, and may be other values in other cases, such as 0.5 seconds, 1.5 seconds, and the like.
  • the current does not change significantly when the driving voltage is constant, because the amount of charge accumulated on the side corresponding to the common electrode can be determined by time.
  • the driving frequency of the data line is constant, the frequency of image frame display or switching does not change, and the number of image frames displayed in the predetermined time is also fixed. Therefore, it is also possible to determine whether the amount of charge accumulated on one side of the common electrode exceeds a preset threshold by counting the number of frames of the displayed image.
  • the common electrode drives the pixel electrode by using the first DC voltage, it is determined whether the number of frames of the image displayed by the touch display panel reaches a preset amount. If the number of frames of the image displayed by the touch display panel reaches a preset amount, it is determined that the amount of charge accumulated on the side corresponding to the common electrode exceeds a preset threshold.
  • the common electrode drives the touch display panel by the second DC voltage in the next display stage.
  • the preset frame number is 60 frames, and may be other values in other cases, such as 80 frames, 120 frames, and the like.
  • the common electrode drives the touch display panel through a second DC voltage that is less than the first DC voltage in the next display phase.
  • the difference between the second DC voltage and the first DC voltage is the same as the amount of charge generated by the common electrode in the display phase.
  • the common electrode drives the pixel electrode through the first DC voltage VCOM1.
  • the touch display panel displays whether the number of frames of the image reaches a preset amount of 60 frames.
  • the common electrode drives the pixel electrode through the first DC voltage VCOM1 for more than a predetermined time, or the common electrode drives the pixel electrode through the first DC voltage VCOM1
  • the touch Controlling the display panel to display the number of frames of the image reaches a preset amount of 60 frames, and the common electrode drives the touch display panel by a second DC voltage VCOM2 that is smaller than the first DC voltage in the next display phase, wherein the The difference between the two DC voltages VCOM2 and the voltage of the first direct current VCOM1 is the same as the amount of charge accumulated in the display phase and the amount of charge accumulated by the common electrode, and the polarities are opposite.
  • the display method of the touch display panel provided by the present invention is to change the common electrode voltage of the DC voltage at the display stage to be constant, and to neutralize the common voltage by lowering the common voltage in the next display stage after the preset time or the number of frames.
  • the positive charge accumulated on one side of the electrode improves the residual image of the touch display panel and improves the display quality.
  • the common electrode drives the touch display panel through a second DC voltage greater than the first DC voltage in the next display phase.
  • the difference between the second DC voltage and the first DC voltage is the same as the amount of charge generated by the common electrode in the display phase.
  • the common electrode drives the pixel electrode through the first DC voltage VCOM1.
  • the touch display panel displays whether the number of frames of the image reaches a preset amount of 60 frames.
  • the common electrode drives the pixel electrode through the first DC voltage VCOM1 for more than a predetermined time, or the common electrode drives the pixel electrode through the first DC voltage VCOM1
  • the touch Controlling the display panel to display the number of frames of the image reaches a preset amount of 60 frames, and the common electrode drives the touch display panel by a second DC voltage VCOM2 greater than the first DC voltage in the next display phase, wherein the The difference between the two DC voltages VCOM2 and the voltage of the first direct current VCOM1 is the same as the amount of charge accumulated in the display phase and the amount of charge accumulated by the common electrode, and the polarities are opposite.
  • the display method of the touch display panel provided by the present invention is to change the common electrode voltage of the DC voltage at the display stage to be constant, and to neutralize the common voltage by increasing the common voltage in the next display stage after the preset time or the number of frames.
  • the accumulated negative charge on the electrode side improves the residual image of the touch display panel and improves the display quality.
  • the common electrode drives the display electrode by setting a square wave voltage.
  • the display method of the touch display panel provided by the present invention is to change the common electrode voltage of a constant DC voltage in the display phase, and to improve the touch display panel by continuously changing the voltage to neutralize the accumulated charge on the side of the common electrode. Afterimage, improve display quality.
  • FIG. 6 is a schematic structural diagram of an embodiment of a touch display panel according to the present invention.
  • the touch display panel provided by the present invention includes an array substrate 603 , a color filter substrate 601 , and a liquid crystal 602 disposed between the array substrate 603 and the color filter substrate 601 .
  • Floor For a clear description of the operation of the touch display panel, reference is made to FIG. 7 and FIG. 7 is a schematic diagram of circuit connection of an embodiment of the touch display panel provided by the present invention.
  • the touch display panel further includes a data line 701, a scan line 702, a thin film transistor 703, a pixel electrode 704, and a common electrode 705, and one end of the pixel electrode 704 is connected to an output end of the thin film transistor 703, The other end of the pixel electrode 704 is connected to the common electrode 705, the input end of the thin film transistor 703 is connected to the data line 701, and the control end of the thin film transistor 703 is connected to the scan line 702; the touch display panel further includes a control circuit 707 and a driving circuit 706, a segment of the driving circuit 706 is connected to the control circuit 707, and another segment is connected to the common electrode 705.
  • the driving circuit 706 outputs a first DC voltage to the common electrode to drive the pixel electrode when the control circuit 707 detects that the touch display panel is in the display phase; the control circuit 707 is in the control circuit 707.
  • a second DC voltage is output to the common electrode 705 to drive the pixel electrode 704 in the next display phase.
  • the difference between the second DC voltage and the first DC voltage is the same as the amount of charge accumulated by the common electrode 705, and the polarity is opposite.
  • the common electrode 705 drives the touch display panel by a second DC voltage smaller than the first DC voltage in the next display stage. And wherein the difference between the second DC voltage and the first DC voltage is the same as the amount of charge generated by the common electrode 705 during the display phase.
  • the common electrode 705 drives the touch display panel by a second DC voltage greater than the first DC voltage in the next display stage; The difference between the second DC voltage and the first DC voltage is the same as the amount of charge generated by the common electrode 705 during the display phase.
  • the driving circuit 706 outputs a set square wave voltage to the common electrode 705 to drive the pixel electrode 704 when the control circuit detects that the touch display panel is in the touch phase.
  • the touch display panel provided by the present invention is a common electrode voltage that changes a DC voltage at a constant display stage, and the charge accumulated on the side of the common electrode is continuously changed by changing the voltage to improve the touch. Control the residual image of the display panel to improve the display quality.
  • the present invention further provides a touch display device comprising the above touch display panel to implement the steps in the above display method.
  • the touch display device changes the common electrode voltage of a constant DC voltage during the display phase, and neutralizes the accumulated charge on the side of the common electrode by continuously changing the voltage, thereby improving the touch. Control the residual image of the display panel to improve the display quality.

Abstract

La présente invention concerne un panneau d'affichage à commande tactile et un procédé d'affichage et un dispositif d'affichage associé, le procédé d'affichage comprenant les étapes suivantes : lorsqu'un panneau d'affichage à commande tactile est dans un étage d'affichage, une électrode commune (705) commande une électrode de pixel (704) au moyen d'une première tension de courant continu ; il est détecté si la quantité de charge électrique accumulée sur un côté correspondant à l'électrode commune (705) dépasse un seuil prédéfini ; et si oui, l'électrode commune (705) commande le panneau d'affichage à commande tactile au moyen d'une seconde tension continue dans l'étage d'affichage suivant, la quantité de charge électrique générée par la valeur de différence entre la seconde tension de courant continu et la première tension de courant continu dans l'étage d'affichage étant la même que celle accumulée par l'électrode commune (705), et la polarité est opposée. Au moyen du procédé d'affichage décrit, des images résiduelles d'un dispositif d'affichage à cristaux liquides peuvent être éliminées, et la qualité d'affichage peut être améliorée.
PCT/CN2017/102653 2017-07-24 2017-09-21 Panneau d'affichage à commande tactile et procédé d'affichage et dispositif d'affichage associé WO2019019322A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710606753.0A CN107193147B (zh) 2017-07-24 2017-07-24 一种触控显示面板及其显示方法、显示装置
CN201710606753.0 2017-07-24

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WO2019019322A1 true WO2019019322A1 (fr) 2019-01-31

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TWI707257B (zh) * 2018-10-08 2020-10-11 友達光電股份有限公司 觸控裝置及其驅動方法

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US20040178982A1 (en) * 2003-03-14 2004-09-16 Au Optronics Corporation Method of driving active matrix liquid crystal display for restraining image sticking
US20070229429A1 (en) * 2006-04-04 2007-10-04 Lg.Philips Lcd Co., Ltd. Liquid crystal display device and driving method thereof
CN101676987A (zh) * 2008-09-19 2010-03-24 精工爱普生株式会社 电光装置、其驱动方法及电子设备
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