WO2017067304A1 - 触摸屏及其驱动方法和显示装置 - Google Patents

触摸屏及其驱动方法和显示装置 Download PDF

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Publication number
WO2017067304A1
WO2017067304A1 PCT/CN2016/095303 CN2016095303W WO2017067304A1 WO 2017067304 A1 WO2017067304 A1 WO 2017067304A1 CN 2016095303 W CN2016095303 W CN 2016095303W WO 2017067304 A1 WO2017067304 A1 WO 2017067304A1
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WO
WIPO (PCT)
Prior art keywords
electrode
touch
touch screen
pressure
driving
Prior art date
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PCT/CN2016/095303
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English (en)
French (fr)
Inventor
丁小梁
董学
王海生
陈小川
刘英明
刘伟
王鹏鹏
任涛
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Priority to US15/501,667 priority Critical patent/US10296124B2/en
Publication of WO2017067304A1 publication Critical patent/WO2017067304A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G06F3/041662—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using alternate mutual and self-capacitive scanning
    • 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
    • G—PHYSICS
    • 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
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a touch screen, a driving method thereof, and a display device.
  • Pressure sensing technology refers to the ability to detect externally applied forces. This technology has long been used in industrial control, medical and other fields. At present, many manufacturers are looking for suitable solutions for implementing pressure-sensitive touch in the field of display, especially mobile phones or flat panel displays, because the display with pressure touch function can provide customers with a better human-computer interaction experience.
  • the display with pressure touch function mostly adds a pressure touch mechanism to the backlight portion of the display (such as a liquid crystal display) or the middle frame portion of the display (for example, a mobile phone) to implement the pressure touch function of the display.
  • the design needs to make changes to the structure of the display itself, and when the pressure touch mechanism is assembled on the display, the accuracy of the pressure detection of the pressure touch mechanism is greatly limited due to the large assembly tolerance;
  • the design makes the cost of the display's pressure-sensitive touch relatively high, which is not conducive to the rapid and widespread promotion of pressure-sensitive touch in the display field.
  • the present invention is directed to the above technical problems existing in the prior art, and provides a touch screen, a driving method thereof, and a display device including the same.
  • the touch screen realizes the pressure sensing touch of the self-capacitance principle, which not only reduces the difficulty of the pressure sensing touch screen, but also improves the touch precision of the pressure sensing touch screen, and reduces the production and assembly cost of the pressure sensing touch screen, thereby making the pressure sensing Touch screens can be promoted more quickly and widely.
  • the present invention provides a touch screen comprising a liquid crystal cell formed by pairing an array substrate and a color filter substrate, and a fixed electrode disposed on a side of the array substrate away from the color filter substrate, the touch screen further comprising a shielding electrode And a common electrode, the common electrode is disposed on the array substrate, the shielding electrode is located on a side of the common electrode remote from the fixed electrode, and the common electrode is used as a first driving electrode when pressure touches
  • the fixed electrode corresponds to the position of the common electrode, and is used to assist the first driving electrode to detect the touch pressure during pressure touch.
  • the common electrode includes a plurality of strip-shaped first sub-electrodes of the same shape, each of the first sub-electrodes extending in a first direction, and the plurality of the first sub-electrodes are parallel to each other and perpendicular to the The second direction of the first direction is sequentially arranged.
  • the common electrode includes a plurality of strip-shaped first sub-electrodes of the same shape, a plurality of the first sub-electrodes are arranged in a matrix, and a length direction of the first sub-electrodes is parallel to a row direction of the matrix .
  • each of the first sub-electrodes is respectively connected to one driving signal line.
  • the fixed electrode is grounded or connected to a fixed voltage.
  • the shielding electrode is the same size and shape as the common electrode, the shielding electrode is opposite to the common electrode and its orthographic projection on the array substrate and/or the color filter substrate is coincident .
  • the shielding electrode is disposed on the color filter substrate.
  • the shielding electrode is disposed above the common electrode on the array substrate, and an insulating layer is interposed between the shielding electrode and the common electrode.
  • the touch screen further includes a sensing electrode disposed on the color filter substrate, and the common electrode is also used as a second driving electrode when the mutual capacitance is touched.
  • the sensing electrode and the shielding electrode are respectively located on opposite sides of the opposite phase of the color filter substrate.
  • the sensing electrode includes a plurality of strip-shaped second sub-electrodes of the same shape, each of the second sub-electrodes extending along the second direction, and the plurality of the second sub-electrodes are parallel to each other and perpendicular to The first direction of the second direction is sequentially arranged.
  • the interior of the touch screen is isolated from the outside and shielded
  • the middle frame of action acts as the fixed electrode.
  • the shielding electrode is configured to eliminate a capacitance formed between the touch object that performs pressure touch on the touch screen and the first driving electrode.
  • the invention also provides a display device comprising the above touch screen.
  • the present invention also provides a driving method of the above touch screen, comprising: a display phase and a pressure touch phase, wherein the display phase and the pressure touch phase are performed in a time-sharing manner;
  • the common electrode inputs a common voltage signal
  • the shield electrode inputs a common voltage signal or is suspended
  • the common electrode is used as a first driving electrode, the first driving electrode inputs a pressure touch driving signal, and the shielding electrode inputs a fixed voltage signal or the pressure touch driving signal, and is fixed.
  • the electrode assists the first driving electrode to detect the touch pressure.
  • the first driving electrodes are simultaneously driven.
  • the pressure touch phase is inserted after the end of any row of pixel display in one frame and before the start of display of the next row of pixels; or the pressure touch phase is inserted after the end of the previous frame display and next Before the frame display starts.
  • the method further includes a mutual capacitance touch phase, wherein the display phase, the pressure touch phase, and the mutual capacitance touch phase are performed in a time-sharing manner;
  • the common electrode is used as a second driving electrode, and the second driving electrode inputs a mutual capacitance touch driving signal, and the shielding electrode is suspended.
  • the second driving electrode is driven row by row.
  • the mutual capacitance touch phase is inserted after the end of any row of pixel display in one frame and before the start of the next row of pixel display; or the mutual capacitance touch phase is inserted after the end of the previous frame display and below One frame before the screen display starts.
  • the touch screen provided by the present invention is passed through public electricity
  • the shielding electrode is disposed on the side away from the fixed electrode, and the common electrode is used as the first driving electrode in the pressure touch; and the pressure sensing is assisted by the fixed electrode inside the touch screen, thereby realizing the pressure of the self-capacitance principle.
  • Inductive touch not only reduces the difficulty of making a pressure-sensitive touch screen, but also improves the touch accuracy of the pressure-sensitive touch screen, and reduces the production and assembly cost of the pressure-sensitive touch screen, so that the pressure-sensitive touch screen can be more quickly and widely promoted.
  • the display device provided by the present invention can realize the pressure-sensitive touch of the self-capacitance principle by using the above-mentioned touch screen, and at the same time reduce the production and assembly cost of the display device.
  • FIG. 1 is a cross-sectional view showing the structure of a touch screen according to an embodiment of the present invention
  • FIG. 2 is a top plan view showing the structure of a common electrode and its wiring in the touch screen shown in FIG. 1;
  • FIG. 3 is a schematic view showing the arrangement of a common electrode, a shield electrode, and a sensing electrode in the touch screen shown in FIG. 1;
  • FIG. 4 is a cross-sectional view showing the structure of a touch screen according to another embodiment of the present invention.
  • FIG. 5 is a cross-sectional view showing the structure of a touch screen according to still another embodiment of the present invention.
  • FIG. 6 is a timing chart of driving of a common electrode and a shield electrode in a touch screen according to an embodiment of the present invention
  • FIG. 7 is a top plan view showing a structure of a common electrode and a wiring thereof in a touch screen according to an embodiment of the present invention.
  • FIG. 8 is a timing chart of driving of a common electrode and a shield electrode in a touch screen according to an embodiment of the present invention.
  • the touch screen includes a liquid crystal cell 3 formed by pairing the array substrate 1 and the color filter substrate 2, and a side of the array substrate 1 remote from the color filter substrate 2 .
  • the fixed electrode 4 further includes a shield electrode 5 and a common electrode 6 disposed on a side of the array substrate 1 adjacent to the color filter substrate 2, and the shield electrode 5 is located away from the fixed electrode 4 of the common electrode 6.
  • the common electrode 6 serves as a first driving electrode when the pressure is touched, and the fixed electrode 4 corresponds to the position of the common electrode 6 for assisting the common electrode 6 serving as the first driving electrode during pressure touch. Touch pressure is detected.
  • a middle frame for isolating and shielding the inside of the touch screen from the outside is usually provided in the touch screen.
  • the middle frame of the touch screen is used as the fixed electrode 4.
  • a self-capacitance is formed between the first driving electrode and the fixed electrode 4, and the self-capacitance changes according to the magnitude of the pressure applied to the touch screen.
  • the touch screen is applied to the touch screen.
  • the greater the pressure above the greater the change in self-capacitance formed between the first drive electrode and the fixed electrode 4; the smaller the pressure applied to the touch screen, the change in self-capacitance formed between the first drive electrode and the fixed electrode 4.
  • the smaller the consequent, the pressure touch on the touch screen can be achieved.
  • the shielding electrode 5 is used to eliminate the capacitance formed between the touch object and the first driving electrode for pressure touch on the touch screen, thereby avoiding the touch object during the pressure touch.
  • the capacitance generated between the first driving electrodes interferes with the self-capacitance generated between the first driving electrode and the fixed electrode 4, thereby not only making the touch screen realize the pressure touch of the self-capacitance touch principle, but also making the touch screen under pressure The accuracy of detecting pressure during touch is greatly improved.
  • the touch screen according to the embodiment of the present invention is provided with the shielding electrode 5 on the side of the common electrode 6 remote from the fixed electrode 4, and the common electrode 6 is used as the first driving electrode when the pressure is touched;
  • the electrode 4 assists in pressure touch, realizes the pressure touch of the self-capacitance principle, not only reduces the difficulty of manufacturing the pressure sensing touch screen, improves the touch precision of the pressure sensing touch screen, but also reduces the production and assembly cost of the pressure sensing touch screen.
  • the pressure-sensitive touch screen can be more quickly and widely promoted.
  • the common electrode 6 may include a shape The same plurality of strip-shaped first sub-electrodes 61 each extending in a first direction (ie, a length direction), the plurality of first sub-electrodes 61 being parallel to each other and second along a first direction perpendicular to the first direction The directions are arranged in order.
  • Each of the first sub-electrodes 61 is connected to a driving signal line 7, respectively.
  • the touch screen may further include a backlight (not shown) disposed on a side of the array substrate 1 away from the color filter substrate 2, and the fixed electrode 4 is located away from the array substrate of the backlight.
  • a backlight (not shown) disposed on a side of the array substrate 1 away from the color filter substrate 2, and the fixed electrode 4 is located away from the array substrate of the backlight.
  • the fixed electrode 4 can also be connected to a fixed voltage.
  • the fixed electrode 4 is disposed on a side of the backlight away from the array substrate 1 so that it does not affect the normal display of the touch screen, and at the same time ensures that the fixed electrode 4 forms isolation and shielding between the inside and the outside of the touch screen, so that the touch screen
  • the inside does not discharge the outside, and it also ensures that external objects do not affect or damage the inside of the touch screen.
  • the shield electrode 5 may be disposed on the color filter substrate 2 as shown in FIGS. 1 and 4. As shown in FIG. 3, the size and shape of the shield electrode 5 may be the same as that of the common electrode 6, and the shield electrode 5 is opposed to the common electrode 6 and its orthographic projection on the array substrate 1 and/or the color filter substrate 2 coincides. In this way, the shielding electrode 5 can better eliminate the capacitance generated between the touch object and the common electrode 6 as the first driving electrode during the pressure touch, thereby avoiding the touch object and the first driving during the pressure touch. The capacitance generated between the electrodes interferes with the self-capacitance generated between the first driving electrode and the fixed electrode 4, thereby improving the accuracy of detecting the pressure of the touch screen during pressure touch.
  • the touch screen may further include a sensing electrode 8 disposed on the color filter substrate 2, and the common electrode 6 is also used as a second driving when the mutual capacitance is touched. electrode.
  • the shielding electrode 5 and the sensing electrode 8 can be respectively disposed on opposite sides of the opposite phase of the color filter substrate 2.
  • the sensing electrode 8 can be located on the side of the shielding electrode 5 away from the common electrode 6, as shown in FIG.
  • the sensing electrode 8 may also be located on the side of the shield electrode 5 near the common electrode 6, as shown in FIG.
  • FIG. 1 and FIG. 3 the touch screen may further include a sensing electrode 8 disposed on the color filter substrate 2, and the common electrode 6 is also used as a second driving when the mutual capacitance is touched. electrode.
  • the shielding electrode 5 and the sensing electrode 8 can be respectively disposed on opposite sides of the opposite phase of the color filter substrate 2.
  • the sensing electrode 8 can be located on the side of the shielding electrode 5 away from the common electrode 6, as shown in FIG.
  • the color filter substrate 2 includes a substrate 21,
  • the shield electrode 5 is disposed on a side of the substrate 21 adjacent to the array substrate 1, and the sensing electrode 8 is disposed on a side of the substrate 21 remote from the array substrate 1.
  • the touch screen not only has a pressure touch function, but also has a mutual capacitance touch function; and the above arrangement can realize the pressure touch of the hybrid in-cell touch screen, thereby saving the production of the touch screen. Cost and process cost also increase the pressure touch accuracy of the touch screen.
  • the sensing electrode 8 may include a plurality of strip-shaped second sub-electrodes 81 of the same shape, each of the second sub-electrodes 81 extending in the second direction, and a plurality of second sub-electrodes 81 are arranged in parallel with each other and sequentially arranged in a first direction perpendicular to the second direction, that is, the extending direction and the arrangement direction of the second sub-electrode 81 are perpendicular to the extending direction and the arrangement direction of the first sub-electrode 61, respectively.
  • the shielding electrode 5 having the same shape and size as the common electrode 6 can prevent crosstalk of the sensing electrode 8 when the mutual capacitance is touched, thereby preventing the shielding electrode 5 from being used as the second driving when the mutual capacitance is touched.
  • the mutual capacitance between the common electrode 6 of the electrode and the sensing electrode 8 affects, so that the pressure touch and the mutual capacitance touch can be performed normally.
  • the shield electrode 5 may also be disposed on the array substrate 1. As shown in FIG. 5, the shield electrode 5 is disposed above the common electrode 6, and an insulating layer 9 is interposed between the shield electrode 5 and the common electrode 6.
  • the common electrode 6 may also include a plurality of strip-shaped first sub-electrodes 61 of the same shape, and the plurality of first sub-electrodes 61 are arranged in a matrix.
  • the cloth has a longitudinal direction of the first sub-electrode 61 parallel to the row direction of the matrix.
  • each of the first sub-electrodes 61 is respectively connected to one driving signal line 7.
  • the common electrode 6 is further divided into a plurality of first sub-electrodes 61 in the above embodiment, which can further increase the first driving electrode for implementing pressure touch in the touch screen.
  • the number of the touch screen makes the detection of the pressure touch point more sensitive, thereby enabling the touch screen to achieve multi-point pressure touch.
  • the embodiment of the present invention further provides a driving method of the touch screen.
  • the driving method includes: a display phase and a pressure touch phase, and the display phase and the pressure touch phase are performed in a time division manner. Public during the display phase The electrode inputs a common voltage signal Vcom, and the shield electrode inputs a common voltage signal Vcom. In addition, the shield electrode can also be left floating during the display phase.
  • the common electrode is used as the first driving electrode, the first driving electrode inputs the pressure touch driving signal Vforce, and the shielding electrode inputs a fixed voltage signal such as Vcom.
  • the shield electrode can also input the pressure touch drive signal Vforce, and the fixed electrode assists the first drive electrode to detect the touch pressure, and the fixed electrode is grounded in the display phase and the pressure touch phase.
  • the fixed electrode can also be connected to a fixed voltage during the display phase and the pressure touch phase.
  • the first drive electrodes are simultaneously driven during the pressure touch phase.
  • the pressure touch phase can be inserted after the end of any line of pixel display in one frame and before the start of the next line of pixel display.
  • the pressure touch phase can also be inserted after the end of the previous frame display and before the next frame display begins.
  • the driving method according to the embodiment of the invention may further include a mutual capacitance touch phase, and the display phase, the pressure touch phase, and the mutual capacitance touch phase are performed in a time division manner.
  • the mutual capacitance touch phase the common electrode is used as the second driving electrode, and the second driving electrode inputs the mutual capacitance touch driving signal Vh, and the shielding electrode is suspended.
  • the second drive electrode is driven row by row during the mutual capacitance touch phase. This makes it possible to better achieve mutual capacitive touch to the touch screen.
  • the mutual capacitance touch phase can be inserted after the end of any row of pixel display in one frame of picture and before the start of display of the next row of pixels.
  • the mutual capacitance touch phase can also be inserted after the end of the previous frame display and before the next frame display begins.
  • the common electrode in the touch screen according to the embodiment of the invention may also not be used as the second driving electrode when the mutual capacitance touch is used.
  • the touch screen only has a pressure touch function, and does not have a mutual capacitance touch function.
  • the driving method for the touch screen only includes the display phase and the pressure touch phase, and does not include the mutual capacitance touch phase.
  • the touch screen by providing a shield electrode on a side of the common electrode remote from the fixed electrode, and using the common electrode as a pressure touch
  • a driving electrode is simultaneously used by the fixed electrode inside the touch screen to assist the pressure touch, thereby realizing the pressure touch of the self-capacitance principle, which not only reduces the difficulty of the pressure sensing touch screen, but also improves the touch precision of the pressure sensing touch screen.
  • the production and assembly costs of the pressure-sensitive touch screen are reduced, so that the pressure-sensitive touch screen can be more quickly and widely promoted.
  • Embodiments of the present invention also provide a display device including a touch screen according to one of the above embodiments of the present invention.
  • the display device can realize the pressure touch of the self-capacitance principle, and at the same time reduce the production and assembly cost of the display device.
  • the display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Position Input By Displaying (AREA)

Abstract

一种触摸屏及其驱动方法和一种显示装置。该触摸屏包括由阵列基板（1）和彩膜基板（2）对盒而成的液晶盒（3）以及设置在阵列基板（1）的远离彩膜基板（2）的一侧的固定电极（4），还包括屏蔽电极（5）和公共电极（6），公共电极（6）设置在阵列基板（1）上，屏蔽电极（5）位于公共电极（6）的远离固定电极（4）的一侧，公共电极（6）用作压力触控时的第一驱动电极，固定电极（4）与公共电极（6）的位置相对应，用于在压力触控时辅助第一驱动电极对触控压力进行探测。该触摸屏实现了自电容原理的压力感应触控，不仅降低了压力感应触摸屏的制作难度，提高了压力感应触摸屏的触控精确度，而且降低了压力感应触摸屏的生产和组装成本，从而使压力感应触摸屏能更加快速并广泛地推广。

Description

触摸屏及其驱动方法和显示装置 技术领域
本发明涉及显示技术领域，具体地，涉及触摸屏及其驱动方法和显示装置。
背景技术
压力感应技术是指能够对外部施加的力进行探测的技术，这项技术很久前就运用在工控，医疗等领域。目前，许多厂商正在寻求合适的方案用以在显示领域尤其是手机或平板显示器领域实现压力感应触控，因为具有压力触控功能的显示器可以使客户得到更好的人机交互体验。
但目前，具有压力触控功能的显示器大多是在显示器(如液晶显示器)的背光部分或者在显示器(例如，手机)的中框部分额外增加压力触控机构来实现显示器的压力触控功能，这种设计需要对显示器本身的结构做出改动，而且在显示器上装配压力触控机构时，由于装配公差较大，导致压力触控机构的压力探测的准确性受到了较大的限制；另外，这种设计使显示器实现压力感应触控的成本也相对较高，不利于压力感应触控在显示领域的快速广泛推广。
发明内容
本发明针对现有技术中存在的上述技术问题，提供一种触摸屏及其驱动方法和包括该触摸屏的显示装置。该触摸屏实现了自电容原理的压力感应触控，不仅降低了压力感应触摸屏的制作难度，提高了压力感应触摸屏的触控精确度，而且降低了压力感应触摸屏的生产和组装成本，从而使压力感应触摸屏能更加快速并广泛地推广。
本发明提供一种触摸屏，包括由阵列基板和彩膜基板对盒而成的液晶盒以及设置在所述阵列基板的远离所述彩膜基板的一侧的固定电极，所述触摸屏还包括屏蔽电极和公共电极，所述公共电极设置在所述阵列基板上，所述屏蔽电极位于所述公共电极的远离所述固定电极的一侧，所述公共电极用作压力触控时的第一驱动电极，所述固定电极与所述公共电极的位置相对应，用于在压力触控时辅助所述第一驱动电极对触控压力进行探测。
优选地，所述公共电极包括形状相同的多个条状第一子电极，每个所述第一子电极沿第一方向延伸，多个所述第一子电极相互平行并沿垂直于所述第一方向的第二方向依次排布。
优选地，所述公共电极包括形状相同的多个条状第一子电极，多个所述第一子电极呈矩阵排布，所述第一子电极的长度方向平行于所述矩阵的行方向。
优选地，每个所述第一子电极分别连接一条驱动信号线。
优选地，所述固定电极接地或连接固定电压。
优选地，所述屏蔽电极的大小和形状与所述公共电极的相同，所述屏蔽电极与所述公共电极正对且其在所述阵列基板和/或所述彩膜基板上的正投影重合。
优选地，所述屏蔽电极设置在所述彩膜基板上。
优选地，所述屏蔽电极设置在所述阵列基板上的所述公共电极的上方，且所述屏蔽电极和所述公共电极之间夹设有绝缘层。
优选地，所述触摸屏还包括感应电极，所述感应电极设置在所述彩膜基板上，所述公共电极还用作互电容触控时的第二驱动电极。
优选地，所述感应电极和所述屏蔽电极分别位于所述彩膜基板的相背对的两侧上。
优选地，所述感应电极包括形状相同的多个条状第二子电极，每个所述第二子电极沿所述第二方向延伸，多个所述第二子电极相互平行并沿垂直于所述第二方向的第一方向依次排布。
优选地，采用将所述触摸屏的内部与外界进行隔离并起屏蔽 作用的中框作为所述固定电极。
优选地，所述屏蔽电极配置为消除对所述触摸屏进行压力触控的触控物与所述第一驱动电极之间形成的电容。
本发明还提供一种显示装置，包括上述触摸屏。
本发明还提供一种上述触摸屏的驱动方法，包括：显示阶段和压力触控阶段，所述显示阶段和所述压力触控阶段分时进行；
在所述显示阶段，公共电极输入公共电压信号，屏蔽电极输入公共电压信号或者悬空；
在所述压力触控阶段，所述公共电极用作第一驱动电极，所述第一驱动电极输入压力触控驱动信号，所述屏蔽电极输入固定电压信号或者所述压力触控驱动信号，固定电极辅助所述第一驱动电极对触控压力进行探测。
优选地，在所述压力触控阶段，对所述第一驱动电极同时进行驱动。
优选地，所述压力触控阶段***到一帧画面中的任意一行像素显示结束之后和下一行像素显示开始之前；或者，所述压力触控阶段***到上一帧画面显示结束之后和下一帧画面显示开始之前。
优选地，还包括互电容触控阶段，所述显示阶段、所述压力触控阶段和所述互电容触控阶段分时进行；
在所述互电容触控阶段，所述公共电极用作第二驱动电极，所述第二驱动电极输入互电容触控驱动信号，所述屏蔽电极悬空。
优选地，在所述互电容触控阶段，对所述第二驱动电极进行逐行驱动。
优选地，所述互电容触控阶段***到一帧画面中任意一行像素显示结束之后和下一行像素显示开始之前；或者，所述互电容触控阶段***到上一帧画面显示结束之后和下一帧画面显示开始之前。
本发明的有益效果：本发明所提供的触摸屏，通过在公共电 极的远离固定电极的一侧设置屏蔽电极，并使公共电极用作压力触控时的第一驱动电极；同时利用触摸屏内部自带的固定电极辅助进行压力触控，实现了自电容原理的压力感应触控，不仅降低了压力感应触摸屏的制作难度，提高了压力感应触摸屏的触控精确度，而且降低了压力感应触摸屏的生产和组装成本，从而使压力感应触摸屏能更加快速并广泛地推广。
本发明所提供的显示装置，通过采用上述触摸屏，使该显示装置能够实现自电容原理的压力感应触控，同时还降低了该显示装置的生产和组装成本。
附图说明
图1为根据本发明实施例的触摸屏的结构剖视图；
图2为图1所示触摸屏中的公共电极及其接线的结构俯视图；
图3为图1所示触摸屏中的公共电极、屏蔽电极和感应电极的排布示意图；
图4为根据本发明另一实施例的触摸屏的结构剖视图；
图5为根据本发明又一实施例的触摸屏的结构剖视图；
图6为根据本发明实施例的触摸屏中的公共电极和屏蔽电极的驱动时序图；
图7为根据本发明实施例的触摸屏中的公共电极及其接线的结构俯视图；以及
图8为根据本发明实施例的触摸屏中的公共电极和屏蔽电极的驱动时序图。
具体实施方式
为使本领域的技术人员更好地理解本发明的技术方案，下面结合附图和具体实施方式对本发明所提供的触摸屏及其驱动方法和包括该触摸屏的显示装置作进一步详细描述。
本发明实施例提供一种触摸屏，如图1所示，该触摸屏包括由阵列基板1和彩膜基板2对盒而成的液晶盒3以及设置在阵列基板1的远离彩膜基板2的一侧的固定电极4，此外，该触摸屏还包括屏蔽电极5和公共电极6，公共电极6设置在阵列基板1的靠近彩膜基板2的一侧上，屏蔽电极5位于公共电极6的远离固定电极4的一侧，公共电极6用作压力触控时的第一驱动电极，固定电极4与公共电极6的位置相对应，用于在压力触控时辅助用作第一驱动电极的公共电极6对触控压力进行探测。
触摸屏中通常设置有用于将触摸屏的内部与外界进行隔离并起屏蔽作用的中框，在本实施例中，采用触摸屏的中框作为固定电极4。在压力触控时，第一驱动电极与固定电极4之间形成自电容，该自电容会随着作用到触摸屏上的压力大小的变化而变化，具体的，在压力触控时，作用到触摸屏上的压力越大，第一驱动电极与固定电极4之间形成的自电容的变化越大；作用到触摸屏上的压力越小，第一驱动电极与固定电极4之间形成的自电容的变化也随之越小，由此可实现对该触摸屏的压力触控。在对该触摸屏进行压力触控的过程中，屏蔽电极5用于消除对触摸屏进行压力触控的触控物与第一驱动电极之间形成的电容，从而避免在压力触控时触控物与第一驱动电极之间产生的电容对第一驱动电极与固定电极4之间产生的自电容造成干扰，进而不仅使该触摸屏实现了自电容触控原理的压力触控，而且使该触摸屏在压力触控时对压力的探测精度大大提高。
根据本发明实施例的触摸屏通过在公共电极6的远离固定电极4的一侧设置屏蔽电极5，并使公共电极6用作压力触控时的第一驱动电极；同时利用触摸屏内部自带的固定电极4辅助进行压力触控，实现了自电容原理的压力触控，不仅降低了压力感应触摸屏的制作难度，提高了压力感应触摸屏的触控精确度，而且降低了压力感应触摸屏的生产和组装成本，从而使压力感应触摸屏能更加快速并广泛地推广。
根据本发明的实施例，如图2所示，公共电极6可包括形状 相同的多个条状第一子电极61，每个第一子电极61沿第一方向(即，长度方向)延伸，多个第一子电极61相互平行并沿垂直于第一方向的第二方向依次排布。每个第一子电极61分别连接一条驱动信号线7。如此设置，能够实现利用自电容原理检测作用在触摸屏上的触控压力。
根据本发明的实施例，该触摸屏还可包括背光源(图中未示出)，该背光源设置在阵列基板1的远离彩膜基板2的一侧，固定电极4位于背光源的远离阵列基板1的一侧；固定电极4与公共电极6相对应，且固定电极4接地。当然，固定电极4也可以接固定电压。固定电极4设置在背光源的远离阵列基板1的一侧，使其既不会对触摸屏的正常显示造成影响，同时又能确保固定电极4在触摸屏内部和外部之间形成隔离和屏蔽，使触摸屏内部不会对外部产生放电，也能确保外部物体不会对触摸屏的内部造成影响或损坏。
根据本发明的实施例，屏蔽电极5可设置在彩膜基板2上，如图1和图4所示。如图3所示，屏蔽电极5的大小和形状可与公共电极6的相同，屏蔽电极5与公共电极6正对且其在阵列基板1和/或彩膜基板2上的正投影重合。如此设置，能使屏蔽电极5在压力触控时更好地消除触控物与作为第一驱动电极的公共电极6之间产生的电容，从而避免在压力触控时触控物与第一驱动电极之间产生的电容对第一驱动电极与固定电极4之间产生的自电容造成干扰，进而提高该触摸屏在压力触控时对压力的探测精度。
根据本发明的实施例，如图1和图3所示，触摸屏还可包括感应电极8，感应电极8设置在彩膜基板2上，公共电极6还用作互电容触控时的第二驱动电极。屏蔽电极5和感应电极8可分别设置在彩膜基板2的相背对的两侧上，具体的，感应电极8可位于屏蔽电极5的远离公共电极6的一侧，如图1所示，或者，感应电极8也可位于屏蔽电极5的靠近公共电极6的一侧，如图4所示。在图1所示的示例实施例中，彩膜基板2包括基底21， 屏蔽电极5设置在基底21的靠近阵列基板1的一侧，感应电极8设置在基底21的远离阵列基板1的一侧。在该情况下，触摸屏不仅具有压力触控功能，而且还具有互电容触控功能；而且，上述设置能够实现混合内嵌式(Hybrid incell)触摸屏的压力触控，从而不仅节约了该触摸屏的制作成本和工艺成本，还提高了该触摸屏的压力触控精度。
根据本发明的实施例，如图3所示，感应电极8可包括形状相同的多个条状第二子电极81，每个第二子电极81沿第二方向延伸，多个第二子电极81相互平行并沿垂直于第二方向的第一方向依次排布，也就是说，第二子电极81的延伸方向和排布方向分别垂直于第一子电极61的延伸方向和排布方向。其中，与公共电极6的形状和大小均相同的屏蔽电极5还能在互电容触控时，防止对感应电极8造成串扰，从而避免在互电容触控时屏蔽电极5对用作第二驱动电极的公共电极6与感应电极8之间的互电容造成影响，进而使压力触控与互电容触控都能够正常进行。
根据本发明的实施例，屏蔽电极5也可以设置在阵列基板1上。如图5所示，屏蔽电极5设置在公共电极6的上方，且屏蔽电极5和公共电极6之间夹设有绝缘层9。
在根据本发明的另一实施例的触摸屏中，如图7所示，公共电极6也可包括形状相同的多个条状第一子电极61，所述多个第一子电极61呈矩阵排布，第一子电极61的长度方向平行于矩阵的行方向。且每个第一子电极61分别连接一条驱动信号线7。在如此设置的触摸屏中，将公共电极6进行了进一步划分，即将上述实施例中的一个第一子电极61划分为多个，这样能进一步增加触摸屏中用于实现压力触控的第一驱动电极的数量，从而使该触摸屏对压力触控点的探测更加灵敏，进而使该触摸屏能够实现多点压力触控。
基于触摸屏的上述结构，本发明实施例还提供一种该触摸屏的驱动方法，如图6所示，该驱动方法包括：显示阶段和压力触控阶段，显示阶段和压力触控阶段分时进行。在显示阶段，公共 电极输入公共电压信号Vcom，屏蔽电极输入公共电压信号Vcom。此外，在显示阶段，屏蔽电极也可以悬空。在压力触控阶段，公共电极用作第一驱动电极，第一驱动电极输入压力触控驱动信号Vforce，屏蔽电极输入固定电压信号，如Vcom。在压力触控阶段，屏蔽电极也可以输入压力触控驱动信号Vforce，固定电极辅助第一驱动电极对触控压力进行探测，固定电极在显示阶段和压力触控阶段均接地。当然，固定电极在显示阶段和压力触控阶段也可以均连接固定电压。
根据本发明的实施例，在压力触控阶段，对第一驱动电极同时进行驱动。压力触控阶段可***到一帧画面中的任意一行像素显示结束之后和下一行像素显示开始之前。可替换的，压力触控阶段也可以***到上一帧画面显示结束之后和下一帧画面显示开始之前。
根据本发明实施例的驱动方法还可包括互电容触控阶段，显示阶段、压力触控阶段和互电容触控阶段分时进行。在互电容触控阶段，公共电极用作第二驱动电极，第二驱动电极输入互电容触控驱动信号Vh，屏蔽电极悬空。
根据本发明的实施例，在互电容触控阶段，对第二驱动电极进行逐行驱动。如此能够更好地实现对该触摸屏的互电容触控。
根据本发明的实施例，互电容触控阶段可***到一帧画面中的任意一行像素显示结束之后和下一行像素显示开始之前。可替换的，互电容触控阶段也可以***到上一帧画面显示结束之后和下一帧画面显示开始之前。
需要说明的是，根据本发明实施例的触摸屏中的公共电极也可不用作互电容触控时的第二驱动电极。在该情况下，触摸屏只具有压力触控功能，而不具有互电容触控功能。相应地，如图8所示，针对该触摸屏的驱动方法也只包括显示阶段和压力触控阶段，而不包括互电容触控阶段。
在根据本发明实施例的触摸屏中，通过在公共电极的远离固定电极的一侧设置屏蔽电极，并使公共电极用作压力触控时的第 一驱动电极；同时利用触摸屏内部自带的固定电极辅助进行压力触控，实现了自电容原理的压力触控，不仅降低了压力感应触摸屏的制作难度，提高了压力感应触摸屏的触控精确度，而且降低了压力感应触摸屏的生产和组装成本，从而使压力感应触摸屏能更加快速并广泛地推广。
本发明实施例还提供了一种显示装置，其包括根据本发明上述实施例之一的触摸屏。
通过采用上述实施例之一的触摸屏，使该显示装置能够实现自电容原理的压力触控，同时还降低了该显示装置的生产和组装成本。
该显示装置可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等具有显示功能的任何产品或部件。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。

Claims (20)

  1. 一种触摸屏，包括由阵列基板和彩膜基板对盒而成的液晶盒以及设置在所述阵列基板的远离所述彩膜基板的一侧的固定电极，其特征在于，所述触摸屏还包括屏蔽电极和公共电极，所述公共电极设置在所述阵列基板上，所述屏蔽电极位于所述公共电极的远离所述固定电极的一侧，所述公共电极用作压力触控时的第一驱动电极，所述固定电极与所述公共电极的位置相对应，用于在压力触控时辅助所述第一驱动电极对触控压力进行探测。
  2. 根据权利要求1所述的触摸屏，其特征在于，所述公共电极包括形状相同的多个条状第一子电极，每个所述第一子电极沿第一方向延伸，多个所述第一子电极相互平行并沿垂直于第一方向的第二方向依次排布。
  3. 根据权利要求1所述的触摸屏，其特征在于，所述公共电极包括形状相同的多个条状第一子电极，多个所述第一子电极呈矩阵排布，所述第一子电极的长度方向平行于所述矩阵的行方向。
  4. 根据权利要求2或3所述的触摸屏，其特征在于，每个所述第一子电极分别连接一条驱动信号线。
  5. 根据权利要求1所述的触摸屏，其特征在于，所述固定电极接地或连接固定电压。
  6. 根据权利要求1所述的触摸屏，其特征在于，所述屏蔽电极的大小和形状与所述公共电极的相同，所述屏蔽电极与所述公共电极正对且其在所述阵列基板和/或所述彩膜基板上的正投 影重合。
  7. 根据权利要求1所述的触摸屏，其特征在于，所述屏蔽电极设置在所述彩膜基板上。
  8. 根据权利要求1所述的触摸屏，其特征在于，所述屏蔽电极设置在所述阵列基板上的所述公共电极的上方，且所述屏蔽电极和所述公共电极之间夹设有绝缘层。
  9. 根据权利要求2所述的触摸屏，其特征在于，所述触摸屏还包括感应电极，所述感应电极设置在所述彩膜基板上，所述公共电极还用作互电容触控时的第二驱动电极。
  10. 根据权利要求9所述的触摸屏，其特征在于，所述感应电极和所述屏蔽电极分别位于所述彩膜基板的相背对的两侧上。
  11. 根据权利要求9所述的触摸屏，其特征在于，所述感应电极包括形状相同的多个条状第二子电极，每个所述第二子电极沿所述第二方向延伸，多个所述第二子电极相互平行并沿垂直于所述第二方向的第一方向依次排布。
  12. 根据权利要求1所述的触摸屏，其特征在于，采用将所述触摸屏的内部与外界进行隔离并起屏蔽作用的中框作为所述固定电极。
  13. 根据权利要求1所述的触摸屏，其特征在于，所述屏蔽电极配置为消除对所述触摸屏进行压力触控的触控物与所述第一驱动电极之间形成的电容。
  14. 一种显示装置，其特征在于，包括权利要求1-13中任意一项所述的触摸屏。
  15. 一种如权利要求1-13中任意一项所述的触摸屏的驱动方法，其特征在于，包括：显示阶段和压力触控阶段，所述显示阶段和所述压力触控阶段分时进行；
    在所述显示阶段，公共电极输入公共电压信号，屏蔽电极输入公共电压信号或者悬空；
    在所述压力触控阶段，所述公共电极用作第一驱动电极，所述第一驱动电极输入压力触控驱动信号，所述屏蔽电极输入固定电压信号或者所述压力触控驱动信号，固定电极辅助所述第一驱动电极对触控压力进行探测。
  16. 根据权利要求15所述的驱动方法，其特征在于，在所述压力触控阶段，对所述第一驱动电极同时进行驱动。
  17. 根据权利要求15所述的驱动方法，其特征在于，所述压力触控阶段***到一帧画面中的任意一行像素显示结束之后和下一行像素显示开始之前；或者，所述压力触控阶段***到上一帧画面显示结束之后和下一帧画面显示开始之前。
  18. 根据权利要求15所述的驱动方法，其特征在于，还包括互电容触控阶段，所述显示阶段、所述压力触控阶段和所述互电容触控阶段分时进行；
    在所述互电容触控阶段，所述公共电极用作第二驱动电极，所述第二驱动电极输入互电容触控驱动信号，所述屏蔽电极悬空。
  19. 根据权利要求18所述的驱动方法，其特征在于，在所述互电容触控阶段，对所述第二驱动电极进行逐行驱动。
  20. 根据权利要求18所述的驱动方法，其特征在于，所述互电容触控阶段***到一帧画面中的任意一行像素显示结束之后和下一行像素显示开始之前；或者，所述互电容触控阶段***到上一帧画面显示结束之后和下一帧画面显示开始之前。
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