WO2014139229A1 - 电容式内嵌触摸屏及显示装置 - Google Patents

电容式内嵌触摸屏及显示装置 Download PDF

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Publication number
WO2014139229A1
WO2014139229A1 PCT/CN2013/077088 CN2013077088W WO2014139229A1 WO 2014139229 A1 WO2014139229 A1 WO 2014139229A1 CN 2013077088 W CN2013077088 W CN 2013077088W WO 2014139229 A1 WO2014139229 A1 WO 2014139229A1
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Prior art keywords
touch
signal line
electrode
array substrate
capacitive
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PCT/CN2013/077088
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English (en)
French (fr)
Inventor
木素真
胡明
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合肥京东方光电科技有限公司
京东方科技集团股份有限公司
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Priority to US14/345,329 priority Critical patent/US9594451B2/en
Publication of WO2014139229A1 publication Critical patent/WO2014139229A1/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
    • G06F3/0416—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
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • G—PHYSICS
    • G06—COMPUTING; 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
    • 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
    • G06F3/047—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires

Definitions

  • Embodiments of the present invention relate to a capacitive in-cell touch screen and display device. Background technique
  • the touch screen can be divided into: an on-touch touch panel, an on-cell touch panel, and an in-cell touch panel (In Cell Touch Panel).
  • the external touch screen is produced by separately separating the touch screen from the liquid crystal display (LCD), and then bonding them together to form a liquid crystal display with touch function; the external touch screen has high production cost, low light transmittance, and thick module. And so on.
  • the in-cell touch screen embeds the touch electrodes of the touch screen inside the liquid crystal display, which can reduce the overall thickness of the module, and can greatly reduce the manufacturing cost of the touch screen, and is favored by major panel manufacturers.
  • the current capacitive in-cell touch panel is directly added to the existing TFT (Thin FET) array substrate by directly adding a touch driving signal line and a touch sensing signal line, that is, two layers of each other are formed on the surface of the TFT array substrate.
  • Strip-shaped ITO (indium tin metal oxide) electrodes intersecting each other, the two ITO electrodes are respectively used as touch driving signal lines and touch sensing signal lines of the touch screen, and forming sensing capacitors at intersections of the opposite surfaces of the two ITO electrodes .
  • the working process of the touch screen is: when loading the touch driving signal to the ITO electrode as the touch driving signal line, detecting the voltage signal that the touch sensing signal line is coupled through the sensing capacitor, in the process, when the human body touches the touch screen
  • the capacitance value of the sensing capacitor changes, thereby changing the voltage signal that the touch sensing signal should be coupled to, and the position of the contact can be determined according to the change of the voltage signal.
  • the structural design of the capacitive in-cell touch panel requires a new pattern structure layer on the existing TFT array substrate due to the addition of the touch driving signal line and the touch sensing signal line, which leads to the need to add a new layer when manufacturing the TFT array substrate.
  • the process increases the production cost and is not conducive to improving production efficiency.
  • Embodiments of the present invention provide a capacitive in-cell touch panel and a display device for implementing a capacitive in-cell touch panel with low cost and high production efficiency.
  • a capacitive in-cell touch panel including a thin film transistor (TFT) array substrate having data signal lines, and a plurality of pixel units arranged in a matrix in the TFT array substrate; the TFT array substrate The touch drive driving signal line is disposed between the pixel units of the adjacent row; the at least one data signal line of the TFT array substrate is used as the touch read signal line; the TFT array substrate includes the touch read signal line and the touch Controlling the touch electrodes and the touch switching unit in the area defined by the overlapping of the driving signal lines; the touch electrodes are electrically connected to the adjacent touch driving signal lines, and are read by the touch switching unit and the adjacent touch signals The signal lines are electrically connected; during the display time period, the touch reading signal line applies a gray scale signal, and the touch switching unit is in a closed state; during the
  • Another aspect of the present invention provides a display device including the above capacitive in-cell touch panel.
  • FIG. 1 and FIG. 2 are respectively schematic structural diagrams of a TFT array substrate in a capacitive in-cell touch panel according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a circuit of a pixel unit according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of driving sequence of a touch screen according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of distribution of a touch electrode and a touch sub-electrode in a touch screen according to an embodiment of the invention. detailed description
  • each layer of the film in the drawings does not reflect the true scale of the TFT array substrate, and the purpose is merely to illustrate the contents of the present invention.
  • Embodiments of the present invention provide a capacitive in-cell touch panel including a thin film transistor TFT array substrate having a data signal line D.
  • a plurality of pixel units 01 arranged in a matrix are disposed in the TFT array substrate;
  • the TFT array substrate includes touch driving signal lines 02 between adjacent pixel units;
  • the TFT array substrate The at least one data signal line D is used as the touch read signal line 03;
  • the TFT array substrate includes the touch electrode 04 and the touch in a region defined by the intersection of the touch read signal line 03 and the touch drive signal line 02
  • the touch control unit is electrically connected to the adjacent touch drive signal line 02 and is electrically connected to the adjacent touch read signal line 03 through the touch switch unit 05.
  • the touch switching unit 05 is in a closed state, and the touch reading signal line 03 applies a gray scale signal; during the touch time period, the touch switching unit 05 is in an on state, and the touch driving signal line 02 The touch driving signal is applied, and the touch driving signal is output to the touch reading signal line 03 after passing through the touch electrode 04.
  • the capacitive in-cell touch panel provided by the embodiment of the present invention can use the data signal line for time division multiplexing, and receive the voltage signal coupled by the touch electrode as the touch read signal line to implement the touch function, so that the existing touch function can be used.
  • the touch screen can be manufactured without adding an additional process, which saves production cost and improves production efficiency.
  • the data signal line as the touch reading signal line, it is possible to avoid adding the driving chip IC for separately controlling the touch reading signal line 03, which can save the manufacturing cost.
  • the touch precision of the touch screen is usually on the order of millimeters, and the display precision of the TFT array substrate is usually on the order of micrometers. It can be seen that the touch drive signal line 02 and the touch read signal line 03 required by the touch screen are larger than the TFT array. The substrate display requires much less of the gate signal line G and the data signal line D. Therefore, in the above example, the touch screen provided by the embodiment of the present invention may only use each touch drive.
  • the spacing between the signal lines 02 is set to be the same; or the spacing between the touch sensing signal lines 03 is set to be the same; the spacing between the touch driving signal lines 02 can also be set to be the same, and each The spacing between the touch read signal lines 03 is also set to be the same.
  • the spacing between the touch driving signal lines 02 and the spacing between the touch reading signal lines 03 can be set to be the same to unify the touch precision of the touch screen.
  • the precision referred to in the embodiment of the present invention refers to the size of a touch electrode of the touch screen or the pixel electrode of the display screen.
  • each touch driving signal line 02 when the touch driving signal line 02 is disposed, each touch driving signal line 02 can be disposed in the same layer as the gate signal line G in the TFT array substrate, and both are guaranteed.
  • the mutual isolation that is, the preparation of the gate signal lines G, the touch drive signal lines 02 are insulated from each other, so that no additional preparation process is required in the preparation of the TFT array substrate, and only one patterning process is required. Forming the pattern of the gate signal line G and the touch driving signal line 02 can save the manufacturing cost and increase the added value of the product.
  • the gate signal line G and the touch driving signal line 02 can be separately formed on different film layers, which is not limited herein.
  • the specific implementation of the touch switching unit 05 is the first TFT device T1.
  • the gate of the first TFT device T1 can be electrically connected to the touch scan signal line 06, the drain and the touch read signal line 03 are electrically connected, and the source and the touch electrode 04 are electrically connected.
  • one implementation of the touch scan signal line 06 may be that the gate signal line G at the gap between the same pixel unit 01 and the touch drive signal line 02 in the TFT array substrate is used as the touch scan signal line 06.
  • the touch scan signal line 06 may be separately provided in the TFT array substrate.
  • the function of the touch scan signal line 06 is to control the on or off state of the touch switch unit 05.
  • the touch scan signal can be sequentially applied to each touch scan signal line 06 to locate the touch point.
  • the longitudinal coordinate that is, the y-direction coordinate
  • the longitudinal coordinate can be obtained by detecting the change of the voltage signal on the touch-reading signal line 03 column by column to obtain the lateral coordinate of the touched point, that is, the X-direction coordinate, thereby implementing the touch function.
  • the touch scan signal line 06 can be omitted, and the gate of the first TFT device T1 is connected to the touch driving signal line 02, so that the touch driving signal line 02 has a guide for controlling the touch switching unit 05.
  • each touch drive signal The line 02 sequentially applies the touch driving signal, and the longitudinal coordinate of the touched point, that is, the y-direction coordinate can be located, and the horizontal coordinate of the touched point, that is, the X-direction coordinate, can be obtained by detecting the voltage signal change on the touch-reading signal line 03 column by column, thereby Implement touch function.
  • the specific structure of the above-mentioned touch switching unit 05 is only a schematic description.
  • the specific structure of the touch switching unit 05 may be other structures, which are not limited herein.
  • the first TFT device in the touch panel provided by the embodiment of the present invention may be formed by the same LTPS (low temperature polysilicon) technology as the second TFT device connecting the pixel electrode and the data signal line in the array substrate, so that the existing TFT is used. Based on the preparation process of the array substrate, the touch screen can be made without adding additional process steps, which saves production cost and improves production efficiency.
  • LTPS low temperature polysilicon
  • the first TFT device as the touch switching unit may constitute an inverter structure with the second TFT device in the TFT array substrate that connects the pixel electrode and the data signal line.
  • the inverter structure may be that the first TFT device is a P-type TFT device, and the second TFT device is an N-type TFT device.
  • the first TFT device is an N-type TFT device
  • the second TFT device is a P-type TFT device, which is not limited herein.
  • the specific working process of the touch screen provided by the embodiment of the present invention is described in detail below with the first TFT device as a P-type TFT device and the second TFT device as an N-type TFT device.
  • FIG. 3 a schematic diagram of a circuit structure of a pixel unit, a P-type first TFT device T1 and an N-type second TFT device T2 share a gate signal line G as a touch scan signal line and serve as a touch Read the data signal line D of the signal line.
  • the time for displaying each frame of the touch screen is divided into a display time period and a touch time period.
  • the time for displaying one frame of the touch screen is 16.7 ms, and 5 ms is selected as the touch time period, and the other 11.7 ms is used as the display time period.
  • the duration of the two chips can be appropriately adjusted according to the processing capability of the IC chip, and is not specifically limited herein.
  • a high-level display scan signal (a positive voltage signal) is sequentially applied to each of the gate signal lines G1, G2, ..., Gn in the touch screen.
  • the N-type second TFT device T2 is turned on, and the P-type first TFT device T1 is turned off; at the same time, a gray-scale signal is applied to the data signal line D, and the gray-scale signal passes.
  • the N-type second TFT device T2 is loaded onto the display capacitor C2 to achieve normal display.
  • the display capacitor C2 is formed by a pixel electrode and a common electrode.
  • a low-level touch scan signal (a negative voltage signal) is sequentially applied to each of the gate signal lines G 1 , G2 , . . . Gn as a touch scan signal line in the touch screen,
  • Each touch driving signal line SI, S2 ... Sn applies a touch driving signal
  • the touch driving signal can be synchronized with the touch scanning signal, of course, for each touch driving signal line SI, S2... ... Sn simultaneously applies a touch driving signal, which is not limited herein, and the touch driving signal is loaded onto the touch electrode connected thereto.
  • the N-type second TFT device T2 is in a closed state, and the P-type first TFT device T1 is turned on, and the touch driving signal is output to the touch through the action of the touch capacitor C1.
  • the touch capacitor C1 is formed by the touch electrode and the common electrode.
  • the human body capacitor AC acts on the touch capacitor C1, causing the voltage signal on the touch electrode to change, thereby changing the touch. Controlling the voltage signal received by the signal line, and detecting the change of the voltage signal on the touch read signal line by column by column, the lateral coordinate of the touch point, that is, the X direction coordinate, can be obtained, and the touch scan signal line is sequentially loaded.
  • the touch scan signal can obtain the vertical coordinate of the touch point, that is, the y direction coordinate, thereby obtaining the touch position, that is, implementing the touch function.
  • an IC chip for controlling the data signal line can be added on the basis of the existing IC chip to realize detection of the output voltage signal and realize the touch function.
  • a metal or a transparent conductive oxide may be used as the material of the touch electrode.
  • each of the touch electrodes and the pixel electrodes may be disposed in different layers.
  • a film layer may be added, and the touch electrode is disposed above the pixel electrode, but it is necessary to ensure that the projection of the touch electrode on the film layer where the pixel electrode is located does not overlap the pixel electrode.
  • the material of the touch electrode is a transparent conductive oxide, the touch electrode can also be prepared in the same layer as the pixel electrode in the TFT array substrate and ensure that the two are insulated from each other.
  • each touch electrode is disposed only in a region defined by the intersection of the touch read signal line and the touch drive signal line, so as to ensure the opening of the touch screen.
  • the rate of each touch electrode is set to be small, which is not conducive to improving touch sensitivity. Therefore, in the above touch screen provided by the embodiment of the present invention, as shown in FIG. 5, the method further includes: at least one touch electrically connected to the touch electrode 04 and located at a gap between adjacent pixel units 01. Control electrode 07. In this way, the touch area of each touch electrode can be increased as much as possible on the basis of ensuring the aperture ratio of the touch screen, so as to improve the sensitivity of the touch sensing.
  • the embodiment of the invention further provides a display device, which comprises the above capacitive touch screen provided by the embodiment of the invention, and the display device can be: a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator Any product or part that has a display function.
  • the display device reference may be made to the above embodiment of the capacitive in-cell touch screen, and the repeated description is omitted.
  • the embodiment of the invention provides a capacitive in-cell touch panel and a display device, wherein a touch driving signal line is disposed between adjacent pixel units in the TFT array substrate; and at least one data signal line in the TFT array substrate is used as a touch Controlling the reading signal line; providing a touch electrode and a touch switching unit in a defined area at a position where the touch reading signal line and the touch driving signal line overlap; the touch electrode is electrically connected to the adjacent touch driving signal line And electrically connected to the adjacent touch read signal lines through the touch switching unit.
  • a gray-scale signal is applied to the touch-reading signal line, and the touch-switching unit is in a closed state; during the touch-time period, a touch driving signal is applied to the touch driving signal line, and the touch switching unit is turned on.
  • the touch driving signal is output to the touch reading signal line after passing through the touch electrode. Since the data signal line is time-division multiplexed, the touch-reading signal line receives the voltage signal coupled by the touch electrode, and the touch function is realized. On the basis of the existing TFT array substrate preparation process, no additional process is required.
  • the touch screen can be made, which saves production costs and improves production efficiency.
  • the data signal line as the touch reading signal line, it is possible to avoid adding a driving chip IC for separately controlling the touch reading signal line, which can save manufacturing cost.

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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)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Position Input By Displaying (AREA)

Abstract

一种电容式内嵌触摸屏及显示装置，在TFT阵列基板中相邻行的像素单元之间设置触控驱动信号线；将TFT阵列基板中的至少一条数据信号线作为触控读取信号线；在触控读取信号线和触控驱动信号线交叠处设定区域内设置触控电极和触控切换单元。不需要增加额外的工艺即可制成触摸屏，节省了生产成本，提高了生产效率。

Description

电容式内嵌触摸屏及显示装置 技术领域
本发明的实施例涉及一种电容式内嵌触摸屏及显示装置。 背景技术
随着小巧、 便携式电子设备的飞速发展， 市场对触摸屏（Touch Screen Panel )的需求与日倶增。 目前， 触摸屏按照组成结构可以分为： 外挂式触摸 屏（ Add on Mode Touch Panel )、覆盖表面式触摸屏 ( On Cell Touch Panel ) 、 以及内嵌式触摸屏 ( In Cell Touch Panel ) 。 外挂式触摸屏是将触摸屏与液晶 显示屏（ LCD )分开生产， 然后贴合到一起成为具有触摸功能的液晶显示屏； 外挂式触摸屏存在制作成本较高、 光透过率较低、 模组较厚等缺点。 内嵌式 触摸屏将触摸屏的触控电极内嵌在液晶显示屏内部， 可以减薄模组整体的厚 度， 又可以大大降低触摸屏的制作成本， 受到各大面板厂家青睐。
目前的电容式内嵌触摸屏是在现有的 TFT (薄膜场效应晶体管 )阵列基 板上直接另外增加触控驱动信号线和触控感应信号线实现的，即在 TFT阵列 基板的表面制作两层相互异面相交的条状 ITO (铟锡金属氧化物） 电极， 这 两层 ITO电极分别作为触摸屏的触控驱动信号线和触控感应信号线， 在两条 ITO电极的异面相交处形成感应电容。 该触摸屏的工作过程为： 在对作为触 控驱动信号线的 ITO电极加载触控驱动信号时，检测触控感应信号线通过感 应电容耦合出的电压信号， 在此过程中， 当有人体接触触摸屏时， 人体电场 就会作用在感应电容上， 使感应电容的电容值发生变化， 进而改变触控感信 号应线耦合出的电压信号， 根据电压信号的变化， 就可以确定触点位置。
上述电容式内嵌触摸屏的结构设计， 由于增加触控驱动信号线和触控感 应信号线， 需要在现有的 TFT阵列基板上增加新的图形结构层， 导致在制作 TFT阵列基板时需要增加新的工艺，使生产成本增加，不利于提高生产效率。 发明内容
本发明实施例提供了一种电容式内嵌触摸屏及显示装置， 用以实现成本 较低、 生产效率较高的电容式内嵌触摸屏。 本发明的一个方面提供了一种电容式内嵌触摸屏， 包括具有数据信号线 的薄膜晶体管（TFT ) 阵列基板， 且在 TFT阵列基板内设有呈矩阵排列的多 个像素单元；该 TFT阵列基板包括位于相邻行的像素单元之间的触控驱动信 号线； 该 TFT 阵列基板中的至少一条数据信号线作为触控读取信号线； 该 TFT阵列基板包括位于触控读取信号线和触控驱动信号线交叠处所限定区域 内的触控电极和触控切换单元；触控电极与相邻的触控驱动信号线电性相连， 且通过触控切换单元与相邻的触控读取信号线电性相连； 在显示时间段， 触 控读取信号线施加灰阶信号， 触控切换单元处于关闭状态； 在触控时间段， 触控驱动信号线施加触控驱动信号， 触控切换单元处于导通状态， 触控驱动 信号经过触控电极后输出到触控读取信号线。
本发明的另一个方面提供了一种显示装置，包括上述电容式内嵌触摸屏。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 筒单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。
图 1和图 2分别为本发明实施例提供的电容式内嵌触摸屏中 TFT阵列基 板的结构示意图；
图 3为本发明实施例提供的一个像素单元的电路结构示意图；
图 4为本发明实施例提供的触摸屏的驱动时序示意图；
图 5为本发明实施例提供的触摸屏中的触控电极和触控子电极的分布示 意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例的附图，对本发明实施例的技术方案进行清楚、 完整地描述。显然， 所描述的实施例是本发明的一部分实施例， 而不是全部的实施例。 基于所描 述的本发明的实施例， 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
除非另作定义， 此处使用的技术术语或者科学术语应当为本发明所属领 域内具有一般技能的人士所理解的通常意义。 "一个" 、 "一" 或者 "该" 等类似词语也不表示数量限制， 而是表示存在至少一个。 "包括" 或者 "包 含" 等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列 举的元件或者物件及其等同， 而不排除其他元件或者物件。 "上" 、 "下" 、 "左" 、 "右" 等仅用于表示相对位置关系， 当被描述对象的绝对位置改变 后， 则该相对位置关系也可能相应地改变。
附图中各层薄膜厚度和形状并不反映 TFT阵列基板真实比例， 目的只是 示意说明本发明内容。
本发明实施例提供了一种电容式内嵌触摸屏， 其包括具有数据信号线 D 的薄膜晶体管 TFT阵列基板。 如图 1所示， 在该 TFT阵列基板内设有呈矩 阵排列的多个像素单元 01; 该 TFT阵列基板包括位于相邻行的像素单元之 间的触控驱动信号线 02; 该 TFT阵列基板中的至少一条数据信号线 D作为 触控读取信号线 03; 该 TFT阵列基板包括位于触控读取信号线 03和触控驱 动信号线 02交叠处所限定区域内的触控电极 04和触控切换单元 05;触控电 极 04与相邻的触控驱动信号线 02电性相连，且通过触控切换单元 05与相邻 的触控读取信号线 03电性相连。
在显示时间段， 所述触控切换单元 05 处于关闭状态， 触控读取信号线 03施加灰阶信号； 在触控时间段， 触控切换单元 05处于导通状态， 触控驱 动信号线 02施加触控驱动信号， 触控驱动信号经过触控电极 04后输出到触 控读取信号线 03。
本发明实施例提供的上述电容式内嵌触摸屏， 由于使用数据信号线分时 复用， 作为触控读取信号线接收触控电极耦合的电压信号， 实现触控功能， 所以能在现有的 TFT阵列基板制备工艺的基础上，不需要增加额外的工艺即 可制成触摸屏， 节省了生产成本， 提高了生产效率。 并且， 使用数据信号线 作为触控读取信号线，可以避免增加单独控制触控读取信号线 03的驱动芯片 IC, 能节省制作成本。
一般地， 触摸屏的触控精度通常在毫米级， 而 TFT阵列基板的显示精度 通常在微米级，可以看出，触摸屏所需的触控驱动信号线 02和触控读取信号 线 03比 TFT阵列基板显示所需的栅极信号线 G和数据信号线 D要少得多。 因此， 本发明实施例提供的上述触摸屏在一个示例中， 可以仅将各触控驱动 信号线 02之间的间距设置为相同； 或者仅将各触控读取信号线 03之间的间 距设置为相同；也可以将各触控驱动信号线 02之间的间距设置为相同， 同时 各触控读取信号线 03之间的间距也设置为相同。例如，以图 1所示的情形为 例， 各触控驱动信号线 02之间间隔两行像素单元 01 , 各触控读取信号线 03 之间间隔两列像素单元 01。 较佳地， 在一个示例中， 可以将各触控驱动信号 线 02之间的间距与各触控读取信号线 03之间的间距设置为相同， 以统一触 摸屏的触控精度。 本发明实施例中所指的精度是指触摸屏的一个触控电极或 者显示屏的像素电极的尺寸。
较佳地， 本发明实施例提供的上述触摸屏， 在设置触控驱动信号线 02 时， 可以将各触控驱动信号线 02与 TFT阵列基板中的栅极信号线 G同层设 置且保证两者相互绝缘， 即在制备各栅极信号线 G的同时制备出与其相互绝 缘的触控驱动信号线 02, 这样在制备 TFT阵列基板时不需要增加额外的制 备工序，只需要通过一次构图工艺即可形成栅极信号线 G和触控驱动信号线 02的图形， 能够节省制备成本， 提升产品附加值。 当然也可以在不同膜层上 分别制备栅极信号线 G和触控驱动信号线 02, 在此不做限定。
进一步地，本发明实施例提供的上述触摸屏的一个示例中，如图 2所示， 触控切换单元 05的具体实现为第一 TFT器件 Tl。 第一 TFT器件 T1的栅极 可以和触控扫描信号线 06电性相连， 漏极和触控读取信号线 03电性相连， 源极和触控电极 04电性相连。
例如， 触控扫描信号线 06的一种实现方式可以是将 TFT阵列基板中与 触控驱动信号线 02位于相同像素单元 01之间的间隙处的栅极信号线 G作为 触控扫描信号线 06, 但也可以在 TFT阵列基板中单独设置触控扫描信号线 06。 设置的触控扫描信号线 06的作用为控制触控切换单元 05的导通或关闭 状态，在触控时间段，通过对各触控扫描信号线 06依次施加触控扫描信号可 以定位触摸点的纵向坐标即 y方向坐标， 通过逐列检测触控读取信号线 03 上的电压信号变化可以得到触摸点的横向坐标即 X方向坐标， 从而实现触控 功能。
此外， 例如， 还可以省去触控扫描信号线 06, 将第一 TFT器件 T1的栅 极与触控驱动信号线 02相连， 这样触控驱动信号线 02就具有控制触控切换 单元 05的导通或关闭状态的作用。 同理， 在触控时间段，对各触控驱动信号 线 02依次施加触控驱动信号，就可以定位触摸点的纵向坐标即 y方向坐标通 过逐列检测触控读取信号线 03 上的电压信号变化可以得到触摸点的横向坐 标即 X方向坐标， 从而实现触控功能。
上述触控切换单元 05的具体结构只是示意说明， 当然触控切换单元 05 的具体结构也可以是其它结构， 在此不做限定。
例如，本发明实施例提供的上述触摸屏中的第一 TFT器件可以采用与阵 列基板中连接像素电极和数据信号线的第二 TFT器件相同的 LTPS (低温多 晶硅）技术形成， 这样在现有的 TFT阵列基板制备工艺的基础上， 不需要增 加额外的工艺步骤即可制成触摸屏， 节省了生产成本， 提高了生产效率。
进一步地， 例如， 作为触控切换单元的第一 TFT器件会与 TFT阵列基 板中连接像素电极和数据信号线的第二 TFT器件组成反相器结构。 具体地， 该反相器结构可以是第一 TFT器件为 P型 TFT器件， 第二 TFT器件为 N型 TFT器件。 当然， 也可以是第一 TFT器件为 N型 TFT器件， 第二 TFT器件 为 P型 TFT器件， 在此不作限定。
下面以第一 TFT器件为 P型 TFT器件，第二 TFT器件为 N型 TFT器件 为例对本发明实施例提供的触摸屏的具体工作过程进行详细说明。
例如， 如图 3所示的一个像素单元的电路结构示意图， P型的第一 TFT 器件 T1和 N型的第二 TFT器件 T2共用作为触控扫描信号线的栅极信号线 G以及作为触控读取信号线的数据信号线 D。
图 3中电路结构的驱动时序的示例， 如图 4所示， 具体说明如下。
首先， 将触摸屏显示每一帧的时间分成显示时间段和触控时间段， 例如 触摸屏的显示一帧的时间为 16.7ms, 选取其中 5ms作为触控时间段， 其他的 11.7ms作为显示时间段。 当然也可以根据 IC芯片的处理能力适当的调整两 者的时长， 在此不做具体限定。
在显示时间段， 对触摸屏中的每条栅极信号线 Gl , G2…… Gn依次施加 的高电平的显示扫描信号（为正值的电压信号） 。 ^^据反相器的原理， 此时 N型的第二 TFT器件 T2导通， P型的第一 TFT器件 T1处于关闭状态； 同 时对数据信号线 D施加灰阶信号， 该灰阶信号通过 N型的第二 TFT器件 T2 加载到显示电容 C2上， 实现正常显示。显示电容 C2是由像素电极和公共电 极形成的。 这样， 即使在显示阶段触控电极上带有电压信号， 由于 P型的第 一 TFT器件 Tl处于关闭状态， 触控电容 C1上的电压信号也不会输出到数 据信号线 D上， 也就不会干扰正常显示。
在触控时间段， 对触摸屏中的作为触控扫描信号线的每条栅极信号线 G 1 , G2…… Gn依次施加低电平的触控扫描信号（为负值的电压信号）， 对每 条触控驱动信号线 SI , S2... ... Sn施加触控驱动信号， 该触控驱动信号可以 和触控扫描信号同步， 当然可以对每条触控驱动信号线 SI , S2…… Sn同时 施加触控驱动信号， 在此不做限定， 该触控驱动信号会加载到与其连接的触 控电极上。 根据反相器的原理， 此时， N型的第二 TFT器件 T2处于关闭状 态， P型的第一 TFT器件 T1导通，触控驱动信号经过触控电容 C1的作用后 会输出到触控读取信号线。 触控电容 C1是由触控电极和公共电极形成的， 当有人体接触触摸展时， 人体电容 AC就会作用在触控电容 C1上， 使触控电 极上的电压信号发生变化， 进而改变触控读取信号线接收到的电压信号， 通 过逐列检测触控读取信号线上的电压信号变化可以得到触摸点的横向坐标即 X方向坐标， 而通过对触控扫描信号线上依次加载的触控扫描信号可以得到 触摸点的纵向坐标即 y方向坐标， 从而得到触摸的位置， 即实现触控功能。 在具体实施时， 可以在现有的 IC 芯片基础上， 增加一个控制数据信号线的 IC芯片以实现对输出电压信号的检测， 实现触控功能。
根据上述描述可知， 利用反相器的原理， 采用对栅极信号线加载不同的 电压信号的方式可以实现单一选择导通与其连接的 N型 TFT器件， 还是导 通与其连接的 P型 TFT器件， 以实现触控和显示的灵活切换。
例如， 本发明实施例提供的上述触摸屏， 在触控读取信号线和触控驱动 信号线交叠处所限定区域内设置触控电极时， 可以采用金属或透明导电氧化 物作为触控电极的材料。
较佳地， 在一个示例中， 每个触控电极和像素电极可以异层设置。 具体 地， 可以增加一层膜层， 将触控电极设置在像素电极的上方， 但需要保证触 控电极在像素电极所在膜层上的投影与像素电极无交叠部分。 当然， 若触控 电极的材料为透明导电氧化物，触控电极也可以与 TFT阵列基板中的像素电 极同层制备且保证两者相互绝缘。
当触控电极和像素电极同层制备时， 由于每个触控电极都仅在触控读取 信号线和触控驱动信号线的交叠处所限定区域内设置， 为保证触摸屏的开口 率，每个触控电极的面积会设置的比较小， 这不利于提高触控灵敏度。 因此， 较佳地， 在本发明实施例提供的上述触摸屏中， 如图 5所示， 还包括： 与触 控电极 04电性相连且位于相邻像素单元 01之间的间隙处的至少一个触控子 电极 07。 这样， 可以在保证触摸屏的开口率的基础上， 尽量增加每个触控电 极的触控面积， 以提高触控感应的灵敏度。
本发明实施例还提供了一种显示装置， 包括本发明实施例提供的上述电 容式内嵌触摸屏， 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、 导航仪等任何具有显示功能的产品或部件。 该显示 装置的实施可以参见上述电容式内嵌触摸屏的实施例， 重复之处不再赘述。
本发明实施例提供的一种电容式内嵌触摸屏及显示装置，在 TFT阵列基 板中相邻行的像素单元之间设置触控驱动信号线；将 TFT阵列基板中的至少 一条数据信号线作为触控读取信号线； 在触控读取信号线和触控驱动信号线 交叠处所限定区域内设置触控电极和触控切换单元； 触控电极与相邻的触控 驱动信号线电性相连， 且通过触控切换单元与相邻的触控读取信号线电性相 连。 在显示时间段， 对触控读取信号线施加灰阶信号， 触控切换单元处于关 闭状态； 在触控时间段， 对触控驱动信号线施加触控驱动信号， 触控切换单 元处于导通状态， 触控驱动信号经过触控电极后输出到触控读取信号线。 由 于使用数据信号线分时复用， 作为触控读取信号线接收触控电极耦合的电压 信号， 实现触控功能， 在现有的 TFT阵列基板制备工艺的基础上， 不需要增 加额外的工艺即可制成触摸屏， 节省了生产成本， 提高了生产效率。 并且， 使用数据信号线作为触控读取信号线， 可以避免增加单独控制触控读取信号 线的驱动芯片 IC, 能节省制作成本。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1、 一种电容式内嵌触摸屏， 包括具有数据信号线的薄膜晶体管 （TFT ) 阵列基板，且在所述 TFT阵列基板内设有呈矩阵排列的多个像素单元，其中， 所述 TFT阵列基板包括位于相邻行的像素单元之间的触控驱动信号线； 所述 TFT阵列基板中的至少一条数据信号线作为触控读取信号线； 所述 TFT 阵列基板包括位于所述触控读取信号线和所述触控驱动信号 线交叠处所限定区域内的触控电极和触控切换单元； 所述触控电极与相邻的 触控驱动信号线电性相连， 且通过所述触控切换单元与相邻的触控读取信号 线电性相连；
在显示时间段， 所述触控读取信号线施加灰阶信号， 所述触控切换单元 处于关闭状态； 在触控时间段， 所述触控驱动信号线施加触控驱动信号， 所 述触控切换单元处于导通状态， 所述触控驱动信号经过所述触控电极后输出 到触控读取信号线。
2、 如权利要求 1所述的电容式内嵌触摸屏， 其中， 所述 TFT阵列基板 中， 与所述触控驱动信号线位于相同像素单元之间的间隙处的栅极信号线作 为触控扫描信号线。
3、如权利要求 2所述的电容式内嵌触摸屏， 其中， 所述触控切换单元为 第一 TFT器件； 其中， 所述第一 TFT器件的栅极和所述触控扫描信号线电 性相连， 漏极和所述触控读取信号线电性相连， 源极和所述触控电极电性相 连； 所述第一 TFT器件与所述 TFT阵列基板中连接像素电极和数据信号线 的第二 TFT器件组成反相器结构。
4、 如权利要求 3所述的电容式内嵌触摸屏， 其中， 所述第一 TFT器件 为 P型 TFT器件， 所述第二 TFT器件为 N型 TFT器件。
5、 如权利要求 1-3任一所述的电容式内嵌触摸屏， 其中， 各所述触控驱 动信号线之间的间距相同； 和 /或， 所述触控读取信号线之间的间距相同。
6、 如权利要求 1-4任一所述的电容式内嵌触摸屏， 其中， 各所述触控驱 动信号线与所述 TFT阵列基板中的栅极信号线同层设置且相互绝缘。
7、 如权利要求 1-6任一所述的电容式内嵌触摸屏， 其中， 所述触控电极 的材料为金属或透明导电氧化物。
8、如权利要求 7所述的电容式内嵌触摸屏， 其中， 所述触控电极的材料 为透明导电氧化物；所述触控电极与所述 TFT阵列基板中的像素电极同层设 置且相互绝缘。
9、 如权利要求 1-8任一项所述的电容式内嵌触摸屏， 还包括： 与所述触 控电极电性相连且位于相邻像素单元之间的间隙处的至少一个触控子电极。
10、 一种显示装置， 包括如权利要求 1-9任一项所述的电容式内嵌触摸 屏。
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