WO2021196010A1 - 触控电路、触控面板和显示装置 - Google Patents

触控电路、触控面板和显示装置 Download PDF

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Publication number
WO2021196010A1
WO2021196010A1 PCT/CN2020/082563 CN2020082563W WO2021196010A1 WO 2021196010 A1 WO2021196010 A1 WO 2021196010A1 CN 2020082563 W CN2020082563 W CN 2020082563W WO 2021196010 A1 WO2021196010 A1 WO 2021196010A1
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WIPO (PCT)
Prior art keywords
circuit
signal line
touch
voltage
transistor
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Application number
PCT/CN2020/082563
Other languages
English (en)
French (fr)
Inventor
宋二龙
余菲
孟会杰
魏博
周宏军
杜丽丽
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
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 京东方科技集团股份有限公司, 成都京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to CN202080000450.4A priority Critical patent/CN113811841B/zh
Priority to US17/260,415 priority patent/US11784642B2/en
Priority to DE112020005525.6T priority patent/DE112020005525T5/de
Priority to PCT/CN2020/082563 priority patent/WO2021196010A1/zh
Publication of WO2021196010A1 publication Critical patent/WO2021196010A1/zh

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • 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
    • G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
    • 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
    • G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
    • 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
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/552—Protection against radiation, e.g. light or electromagnetic waves
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K2017/9602—Touch switches characterised by the type or shape of the sensing electrodes
    • H03K2017/9604—Touch switches characterised by the type or shape of the sensing electrodes characterised by the number of electrodes
    • H03K2017/9613—Touch switches characterised by the type or shape of the sensing electrodes characterised by the number of electrodes using two electrodes per touch switch

Definitions

  • the present disclosure relates to the field of display technology, and in particular to a touch circuit, a touch panel, and a display device.
  • TSP Touch Screen Panel, touch panel
  • external type external (On-Cell) type
  • built-in In-Cell
  • TDDI Touch and Display Driver Integration
  • a touch circuit including: a plurality of touch signal lines electrically connected to a control circuit; a voltage signal line for providing a preset voltage; and a plurality of switch circuits, so
  • the switch circuit and the touch signal line correspond one-to-one, and the switch circuit is electrically connected to the corresponding touch signal line and the voltage signal line, respectively, and the switch circuit is configured to operate on the corresponding touch signal line.
  • the voltage value on the line is in the off state when the voltage value is within the preset range, and is also configured to be in the on state when the voltage value on the corresponding touch signal line is not within the preset range.
  • the voltage signal line includes a first voltage sub-signal line;
  • the switch circuit includes a first switch sub-circuit, and the first switch sub-circuit is respectively connected to the corresponding touch signal line and the first The voltage sub-signal line is electrically connected, and the first switch sub-circuit is in the off state when the voltage value of the corresponding touch signal line is not greater than the first preset voltage, and the corresponding touch signal When the voltage value on the line is greater than the first preset voltage, it is in a conducting state.
  • the first switch sub-circuit includes a first transistor, the first electrode of the first transistor is electrically connected to the corresponding touch signal line, and the second electrode of the first transistor is electrically connected to the corresponding touch signal line.
  • the first voltage sub-signal line is electrically connected, and the gate of the first transistor is electrically connected to the second electrode of the first transistor.
  • the first electrode and the second electrode of the first transistor are off. OFF state; when the voltage value of the first transistor on the corresponding touch signal line is greater than the first preset voltage, the first electrode and the second electrode of the first transistor are in a conducting state.
  • the voltage signal line further includes a second voltage sub-signal line, wherein the voltage value on the first voltage sub-signal line is greater than the voltage value on the second voltage sub-signal line;
  • the switch The circuit further includes a second switch sub-circuit, the second switch sub-circuit is electrically connected to the corresponding touch signal line and the second voltage sub-signal line, and the second switch sub-circuit is in the corresponding When the voltage value on the touch signal line is not greater than the second preset voltage, it is in the on state, and when the voltage value on the corresponding touch signal line is greater than the second preset voltage, it is in the off state.
  • the second switch sub-circuit includes a second transistor, the first electrode of the second transistor is electrically connected to the second voltage sub-signal line, and the second electrode of the second transistor is electrically connected to the second voltage sub-signal line.
  • the corresponding touch signal line is electrically connected, and the gate of the second transistor is electrically connected to the second electrode of the second transistor.
  • the first electrode and the second electrode of the first transistor are in conductive state. On state; when the voltage value of the second transistor on the corresponding touch signal line is greater than the second preset voltage, the first electrode and the second electrode of the second transistor are in the off state.
  • the touch circuit further includes: a plurality of filter circuits, and the filter circuit corresponds to the touch signal line one-to-one; the first end of the filter circuit is electrically connected to the corresponding touch signal line. Connected, the second end of the filter circuit is electrically connected with the control circuit.
  • the filter circuit includes an RC filter circuit.
  • the touch circuit further includes: a closed circuit, the closed circuit and the touch signal line and the common voltage signal line are arranged in the same layer, and the closed circuit connects the touch signal line and the common voltage signal line.
  • the common voltage signal lines are isolated.
  • the closed circuit and the control circuit are electrically connected.
  • the closed circuit is grounded under the control of the control circuit.
  • a touch panel including the touch circuit as described in any of the above embodiments.
  • the touch panel includes a display area and a peripheral area
  • the display area includes a pixel drive circuit
  • a switch circuit and a control circuit in the touch circuit are located in the peripheral area, wherein: the touch The closed circuit in the control circuit is closed and arranged around the peripheral area; the switch circuit and the pixel drive circuit are arranged in the same layer.
  • a display device including the touch panel as described in any of the above embodiments.
  • FIG. 1 is a schematic structural diagram of a touch circuit according to an embodiment of the present disclosure
  • Fig. 2 is a schematic structural diagram of a switch circuit according to an embodiment of the present disclosure
  • Fig. 3 is a schematic structural diagram of a switch circuit according to another embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a switch circuit according to another embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a touch circuit according to another embodiment of the present disclosure.
  • Fig. 6 is a schematic structural diagram of an RC filter circuit according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a touch circuit according to another embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a touch circuit according to another embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a touch panel according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a touch panel according to another embodiment of the present disclosure.
  • the inventor found through research that, in the built-in touch panel, since the TSP signal line is provided in the panel, the touch signal transmitted in the TSP signal line will be interfered by external static electricity, resulting in a decrease in the performance of the touch panel.
  • the present disclosure proposes a touch control circuit, so as to effectively reduce the electrostatic interference of the touch signal.
  • FIG. 1 is a schematic structural diagram of a touch circuit according to an embodiment of the present disclosure.
  • the touch circuit includes a control circuit 11, a plurality of touch signal lines 121-12m electrically connected to the control circuit 11, a plurality of switch circuits 131-13m, and a voltage signal line 14.
  • the voltage signal line 14 is used to provide a preset voltage.
  • the switch circuits 131-13m and the touch signal lines 121-12m correspond one-to-one.
  • control circuit 11 includes a touch IC (Integrated Circuit, integrated circuit).
  • the switching circuit 131-13m includes a circuit having a switching function.
  • Each switch circuit is electrically connected to the corresponding touch signal line and voltage signal line.
  • Each switch circuit is configured to be in the off state when the voltage value on the corresponding touch signal line is within the preset range, and is also configured to be in the off state when the voltage value on the corresponding touch signal line is not within the preset range In the case of the inside, it is in a conducting state.
  • the switch circuit 131 is electrically connected to the corresponding touch signal line 121 and the voltage signal line 14 respectively, and the switch circuit 132 is electrically connected to the corresponding touch signal line 122 and the voltage signal line 14 respectively. If the touch signal on the touch signal line 121 is interfered by external static electricity, the voltage value of the touch signal is not within the preset range. In this case, the switch circuit 131 is in the conducting state, so that the touch signal line 121 and The voltage signal line 14 realizes electrical connection. If the voltage value of the touch signal on the touch signal line 122 is within the preset range, the switch circuit 132 is in an off state, so that the touch signal line 121 and the voltage signal line 14 will not be electrically connected.
  • the switch circuit uses the voltage provided by the voltage signal line as the touch signal In order to avoid the abnormal voltage of the touch signal from affecting the performance of the touch circuit.
  • Fig. 2 is a schematic structural diagram of a switch circuit according to an embodiment of the present disclosure.
  • the switch circuit 22 includes a first switch sub-circuit 221.
  • the voltage signal line 14 includes a first voltage sub-signal line 141.
  • the first switch sub-circuit 221 is electrically connected to the corresponding touch signal line 21 and the first voltage sub-signal line 141, respectively.
  • the first switching sub-circuit 211 includes a circuit having a switching function.
  • the first voltage sub-signal line 141 is a high-potential signal VGH signal line.
  • the first switch sub-circuit 221 is in an off state when the voltage value of the touch signal on the corresponding touch signal line 21 is not greater than the first preset voltage.
  • the first switch sub-circuit 221 is in a conducting state when the voltage value of the touch signal on the corresponding touch signal line 21 is greater than the first preset voltage.
  • the first preset voltage is a positive voltage. If the touch signal on the touch signal line 21 is interfered by external static electricity, the voltage value of the touch signal is greater than the first preset voltage. In this case, the first switch sub-circuit 221 is in a conducting state, so that the voltage provided by the first voltage sub-signal line 141 is used as the voltage value of the touch signal. Therefore, it is ensured that the voltage value of the touch signal on the touch signal line 21 is not greater than the first preset voltage, so as to prevent the performance of the touch circuit from being affected by the abnormal voltage of the touch signal.
  • the first switch sub-circuit 221 is in an off state. Therefore, the touch signal on the touch signal line 21 will not be affected by the first voltage sub-signal line 141.
  • Fig. 3 is a schematic structural diagram of a switch circuit according to another embodiment of the present disclosure.
  • the switch circuit 22 further includes a second switch sub-circuit 222.
  • the voltage signal line 14 includes a second voltage sub-signal line 142.
  • the second switch sub-circuit 222 is electrically connected to the corresponding touch signal line 21 and the second voltage sub-signal line 142 respectively.
  • the voltage value on the first voltage sub-signal line 141 is greater than the voltage value on the second voltage sub-signal line 142.
  • the voltage value on the first voltage sub-signal line 141 is a positive voltage
  • the voltage value on the second voltage sub-signal line 142 is a negative voltage.
  • the second switching sub-circuit 222 includes a circuit having a switching function.
  • the second voltage sub-signal line 142 is a low-potential signal VGL signal line.
  • the second switch sub-circuit 222 is in a conducting state when the voltage value on the corresponding touch signal line 21 is not greater than the second preset voltage.
  • the second switch sub-circuit 222 is in an off state when the voltage value on the corresponding touch signal line 21 is greater than the second preset voltage.
  • the second preset voltage is less than the first preset voltage.
  • the first predetermined voltage is a positive voltage
  • the second predetermined voltage is a negative voltage.
  • the touch signal line 21 is interfered by external static electricity, a small voltage fluctuation will also be generated on the touch signal line 21 when the touch signal line 21 does not transmit a touch signal.
  • the second switch sub-circuit 222 is in the conducting state, thereby reducing the voltage provided by the second voltage sub-signal line 142 As the voltage value of the touch signal. In this way, it is ensured that the voltage value of the touch signal on the touch signal line 21 will not be less than the second preset voltage, and the performance of the touch circuit is prevented from being affected by voltage fluctuations on the touch signal line 21.
  • the second switch sub-circuit 222 is in an off state. In this case, the second voltage sub-signal line 142 will not affect the touch signal on the touch signal line 21.
  • Fig. 4 is a schematic structural diagram of a switch circuit according to another embodiment of the present disclosure. The difference between FIG. 4 and FIG. 3 is that, in the embodiment shown in FIG. 4, the first switch sub-circuit 221 includes a first transistor Q1, and the second switch sub-circuit 222 includes a second transistor Q2.
  • the first electrode Q11 of the first transistor Q1 is electrically connected to the corresponding touch signal line 21, the second electrode Q12 of the first transistor Q1 is electrically connected to the first voltage sub-signal line 141, and the gate Q13 of the first transistor Q1 is electrically connected to the first voltage sub-signal line 141.
  • the second electrode Q12 of a transistor Q1 is electrically connected.
  • the first electrode Q21 of the second transistor Q2 is electrically connected to the second voltage sub-signal line 142
  • the second electrode Q22 of the second transistor Q2 is electrically connected to the corresponding touch signal line 21, and the gate Q23 of the second transistor Q2 is electrically connected to the The second electrode Q22 of the two transistors Q2 is electrically connected.
  • the first electrode Q11 and the second electrode Q12 of the first transistor Q1 are in an off state.
  • the first electrode Q11 and the second electrode Q12 of the first transistor Q1 are in a conductive state.
  • the first electrode Q21 and the second electrode Q22 of the second transistor are in a conductive state.
  • the voltage value of the second transistor Q2 on the corresponding touch signal line 21 is greater than the second preset voltage, the first electrode Q21 and the second electrode Q22 of the second transistor Q2 are in an off state.
  • the first switch sub-circuit 221 and the second switch sub-circuit 222 it is possible to ensure that the voltage of the touch signal provided to the control circuit 11 is within a preset range, thereby effectively avoiding the impact of external electrostatic interference on the performance of the touch circuit .
  • FIG. 5 is a schematic structural diagram of a touch circuit according to another embodiment of the present disclosure.
  • the touch circuit further includes a plurality of filter circuits 151-15m.
  • the filter circuit 151-15m corresponds to the touch signal line 121-12m one-to-one.
  • Each filter circuit has a first terminal and a second terminal. The first end is electrically connected to the corresponding touch signal line, and the second end is electrically connected to the control circuit 11.
  • the filter circuit 151 can perform noise filtering on the touch signal on the touch signal line 121
  • the filter circuit 152 can perform noise filter on the touch signal on the touch signal line 122. By performing noise filtering on the touch signal, the performance of the touch circuit can be improved.
  • each filter circuit includes an RC filter circuit or other suitable filter circuit.
  • Fig. 6 is a schematic structural diagram of an RC filter circuit according to an embodiment of the present disclosure.
  • the RC filter circuit includes resistors R1, R2, and R3, and capacitors C1, C2, and C3.
  • the first end R11 of the resistor R1 is electrically connected to the touch signal line
  • the second end R12 of the resistor R1 is electrically connected to the first end R21 of the resistor R2 and the first end C11 of the capacitor C1.
  • the second end R22 of the resistor R2 is electrically connected to the first end R31 of the resistor R3 and the first end C21 of the capacitor C2.
  • the second end R32 of the resistor R3 is electrically connected to the control circuit and the first end C31 of the capacitor C3.
  • the second terminal C12 of the capacitor C1, the second terminal C22 of the capacitor C2, and the second terminal C32 of the capacitor C3 are grounded. That is, the second terminal C12 of the capacitor C1, the second terminal C22 of the capacitor C2, and the second terminal C32 of the capacitor C3 are electrically connected to the ground terminal of the touch circuit.
  • the filter circuit can filter the noise in the touch signal on the corresponding touch signal line, thereby improving the performance of the touch circuit.
  • the RC filter circuit shown in FIG. 6 includes three capacitors.
  • the number of capacitors is not limited to this, and the number of capacitors included in the RC filter circuit can be more than three or less than three.
  • LTPS Low Temperature Poly Silicon
  • the resistance of the LTPS trace is relatively large, which is conducive to the release of interference signals.
  • gate layer traces and source drain (SD) layer traces are used as the two plates of the capacitor in the RC filter circuit.
  • FIG. 7 is a schematic structural diagram of a touch circuit according to another embodiment of the present disclosure.
  • the touch circuit further includes a closed circuit 16 and a common voltage signal circuit 17.
  • the closed circuit 16, the multiple touch signal lines 121-12m, and the common voltage signal line 17 are arranged on the same layer, that is, the closed circuit 16, the multiple touch signal lines 121-12m, and the common voltage signal line 17 are located on the same layer in the touch circuit. ⁇
  • each touch signal line is formed by using a metal wire located in the same film layer.
  • the closed line 16 isolates the multiple touch signal lines 121-12m from the common voltage signal line 17.
  • the closed circuit 16 divides the plane into two areas, namely the first area surrounded by the closed circuit 16 , And a second area on the plane other than the first area, the closed line 16 is the boundary between the first area and the second area.
  • the multiple touch signal lines 121-12m are located in the first area.
  • the switch circuit and filter circuit configured for each touch signal line are also located in the second area.
  • the closed circuit 16 is equivalent to a coil. According to the principle of electromagnetic induction, the changing voltage signal on the common voltage signal line 17 will generate a changing magnetic field. The generated magnetic field generates an induced charge in the coil, and the induced charge will have a shielding effect on the generated magnetic field.
  • the multiple touch signal lines 121-12m, and the common voltage signal line 17 are arranged on the same plane, the multiple touch signal lines 121-12m provided inside the closed circuit 16 can be effectively reduced. The influence of the magnetic field generated by the common voltage signal line 17 on the same layer.
  • the common voltage signal line 17 includes a low voltage power supply signal VSS line.
  • FIG. 8 is a schematic structural diagram of a touch circuit according to another embodiment of the present disclosure. The difference between FIG. 8 and FIG. 7 is that in the embodiment shown in FIG. 8, the closed circuit 16 and the control circuit 11 are electrically connected through at least one idle touch circuit.
  • one end of the idle touch line 123 is electrically connected to the closed line 16, and the other end of the touch line 123 is electrically connected to the control circuit 11 through the corresponding filter circuit 153.
  • the control circuit 11 can be used to control the voltage value of the closed circuit 16.
  • the idle touch line 123 is a touch line that does not transmit a touch signal.
  • control circuit 11 controls the closing circuit 16 to be grounded through the touch circuit 123. Since the closed circuit 16 is grounded, the multiple touch signal lines 121-12m arranged inside the closed circuit 16 can have a better electromagnetic shielding effect.
  • FIG. 9 is a schematic structural diagram of a touch panel according to an embodiment of the present disclosure.
  • the touch panel 91 includes a touch circuit 92.
  • the touch circuit 92 is a touch circuit related to any one of the embodiments in FIGS. 1 to 8.
  • the present disclosure also provides a display device.
  • the display device includes the touch panel involved in any of the embodiments in FIG. 9.
  • the display device can be any product or component with a display function, such as a display, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, and so on.
  • FIG. 10 is a schematic structural diagram of a touch panel according to another embodiment of the present disclosure.
  • the touch panel includes a display area 1001 and a peripheral area 1002.
  • the display area 1001 includes a pixel driving circuit, and the switch circuit and the control circuit in the touch circuit are located in the peripheral area 1002.
  • the closed circuit in the touch circuit is closed and arranged around the peripheral area 1002, and the switch circuit in the touch circuit and the pixel drive circuit in the display area 1001 are arranged in the same layer.

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Abstract

本公开提供一种触控电路、触控面板和显示装置。触控电路包括多条与控制电路电连接的触控信号线；用于提供预设电压的电压信号线；和多个开关电路，开关电路和触控信号线一一对应，开关电路分别与对应的触控信号线和电压信号线电连接，开关电路被配置为在对应的触控信号线上的电压值在预设范围内的情况下处于关断状态，还被配置为在对应的触控信号线上的电压值不在预设范围内的情况下处于导通状态。本公开能够有效减小触控信号线所受到的干扰。

Description

触控电路、触控面板和显示装置 技术领域
本公开涉及显示技术领域，特别涉及一种触控电路、触控面板和显示装置。
背景技术
目前，AMOLED(Active Matrix Organic Light-Emitting Diode，主动矩阵有机发光二极管)TSP(Touch Screen Panel，触控面板)可分为外挂式、外置(On-Cell)式和内置(In-Cell)式三种。在内置式触控面板中，通过将TSP信号线引入面板，从而实现TDDI(Touch and Display Driver Integration，触控与显示驱动器集成)，以获得更薄的面板和更窄的下边框。
发明内容
根据本公开实施例的第一方面，提供一种触控电路，包括：多条与控制电路电连接的触控信号线；用于提供预设电压的电压信号线；和多个开关电路，所述开关电路和所述触控信号线一一对应，所述开关电路分别与对应的触控信号线和所述电压信号线电连接，所述开关电路被配置为在所述对应的触控信号线上的电压值在预设范围内的情况下处于关断状态，还被配置为在所述对应的触控信号线上的电压值不在预设范围内的情况下处于导通状态。
在一些实施例中，所述电压信号线包括第一电压子信号线；所述开关电路包括第一开关子电路，所述第一开关子电路分别与对应的触控信号线和所述第一电压子信号线电连接，所述第一开关子电路在所述对应的触控信号线上的电压值不大于第一预设电压的情况下处于关断状态，在所述对应的触控信号线上的电压值大于第一预设电压的情况下处于导通状态。
在一些实施例中，所述第一开关子电路包括第一晶体管，所述第一晶体管的第一电极和所述对应的触控信号线电连接，所述第一晶体管的第二电极和所述第一电压子信号线电连接，所述第一晶体管的栅极和所述第一晶体管的第二电极电连接。
在一些实施例中，所述第一晶体管在所述对应的触控信号线上的电压值不大于第一预设电压的情况下，所述第一晶体管的第一电极和第二电极处于关断状态；所述第一晶体管在所述对应的触控信号线上的电压值大于第一预设电压的情况下，所述第一 晶体管的第一电极和第二电极处于导通状态。
在一些实施例中，所述电压信号线还包括第二电压子信号线，其中所述第一电压子信号线上的电压值大于所述第二电压子信号线上的电压值；所述开关电路还包括第二开关子电路，所述第二开关子电路分别与所述对应的触控信号线和所述第二电压子信号线电连接，所述第二开关子电路在所述对应的触控信号线上的电压值不大于第二预设电压的情况下处于导通状态，在所述对应的触控信号线上的电压值大于第二预设电压的情况下处于关断状态。
在一些实施例中，所述第二开关子电路包括第二晶体管，所述第二晶体管的第一电极和所述第二电压子信号线电连接，所述第二晶体管的第二电极和所述对应的触控信号线电连接，所述第二晶体管的栅极和所述第二晶体管的第二电极电连接。
在一些实施例中，所述第二晶体管在所述对应的触控信号线上的电压值不大于第二预设电压的情况下，所述第一晶体管的第一电极和第二电极处于导通状态；所述第二晶体管在所述对应的触控信号线上的电压值大于第二预设电压的情况下，所述第二晶体管的第一电极和第二电极处于关断状态。
在一些实施例中，触控电路还包括：多个滤波电路，所述滤波电路和所述触控信号线一一对应；所述滤波电路的第一端与所述对应的触控信号线电连接，所述滤波电路的第二端与所述控制电路电连接。
在一些实施例中，所述滤波电路包括RC滤波电路。
在一些实施例中，触控电路还包括：闭合线路，所述闭合线路和所述触控信号线和公共电压信号线路同层设置，且所述闭合线路将所述触控信号线和所述公共电压信号线路相隔离。
在一些实施例中，所述闭合线路和所述控制电路电连接。
在一些实施例中，所述闭合线路在所述控制电路的控制下接地。
根据本公开实施例的第二方面，提供一种触控面板，包括如上述任一实施例所述的触控电路。
在一些实施例中，所述触控面板包括显示区和周边区，所述显示区包括像素驱动电路，所述触控电路中的开关电路和控制电路位于所述周边区，其中：所述触控电路中的闭合线路围绕所述周边区闭合设置；所述开关电路和所述像素驱动电路同层设置。
根据本公开实施例的第三方面，提供一种显示装置，包括如上述任一实施例所述 的触控面板。
通过以下参照附图对本公开的示例性实施例的详细描述，本公开的其它特征及其优点将会变得清楚。
附图说明
构成说明书的一部分的附图描述了本公开的实施例，并且连同说明书一起用于解释本公开的原理。
参照附图，根据下面的详细描述，可以更加清楚地理解本公开，其中：
图1是根据本公开一个实施例的触控电路的结构示意图；
图2是根据本公开一个实施例的开关电路的结构示意图；
图3是根据本公开另一个实施例的开关电路的结构示意图；
图4是根据本公开又一个实施例的开关电路的结构示意图；
图5是根据本公开另一个实施例的触控电路的结构示意图；
图6是根据本公开一个实施例的RC滤波电路的结构示意图；
图7是根据本公开又一个实施例的触控电路的结构示意图；
图8是根据本公开又一个实施例的触控电路的结构示意图。
图9是根据本公开一个实施例的触控面板的结构示意图；
图10是根据本公开另一个实施例的触控面板的结构示意图。
应当明白，附图中所示出的各个部分的尺寸并不是按照实际的比例关系绘制的。此外，相同或类似的参考标号表示相同或类似的构件。
具体实施方式
现在将参照附图来详细描述本公开的各种示例性实施例。对示例性实施例的描述仅仅是说明性的，决不作为对本公开及其应用或使用的任何限制。本公开可以以许多不同的形式实现，不限于这里所述的实施例。提供这些实施例是为了使本公开透彻且完整，并且向本领域技术人员充分表达本公开的范围。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、材料的组分和数值应被解释为仅仅是示例性的，而不是作为限制。
本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的部分。“包括”或者“包含”等类似的词语意指在 该词前的要素涵盖在该词后列举的要素，并不排除也涵盖其他要素的可能。
本公开使用的所有术语(包括技术术语或者科学术语)与本公开所属领域的普通技术人员理解的含义相同，除非另外特别定义。还应当理解，在诸如通用字典中定义的术语应当被解释为具有与它们在相关技术的上下文中的含义相一致的含义，而不应用理想化或极度形式化的意义来解释，除非这里明确地这样定义。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为说明书的一部分。
发明人通过研究发现，在内置式触控面板中，由于TSP信号线设置在面板中，因此在TSP信号线中传输的触控信号会受到外界静电的干扰，从而导致触控面板性能下降。
据此，本公开提出一种触控电路，以便能够有效减小触控信号受到的静电干扰。
图1是根据本公开一个实施例的触控电路的结构示意图。如图1所示，触控电路包括控制电路11、多条与控制电路11电连接的触控信号线121-12m、多个开关电路131-13m，以及电压信号线14。电压信号线14用于提供预设电压。开关电路131-13m和触控信号线121-12m一一对应。
在一些实施例中，控制电路11包括触控IC(Integrated Circuit，集成电路)。开关电路131-13m包括具有开关功能的电路。
每个开关电路分别与对应的触控信号线和电压信号线电连接。每个开关电路被配置为在对应的触控信号线上的电压值在预设范围内的情况下处于关断状态，还被配置为在对应的触控信号线上的电压值不在预设范围内的情况下处于导通状态。
例如，开关电路131分别与对应的触控信号线121和电压信号线14电连接，开关电路132分别与对应的触控信号线122和电压信号线14电连接。若触控信号线121上的触控信号因受到外界静电干扰，导致触控信号的电压值不在预设范围内，在这种情况下开关电路131处于导通状态，从而触控信号线121和电压信号线14实现电连接。若触控信号线122上的触控信号电压值在预设范围内，则开关电路132处于关断状态，从而触控信号线121和电压信号线14不会发生电连接。
在本公开上述实施例提供的触控电路中，在触控信号线上的触控信号因受到外界静电干扰而导致电压值异常的情况下，开关电路将电压信号线提供的电压作为触控信号的电压值，从而避免因触控信号的电压异常而给触控电路的性能造成影响。
图2是根据本公开一个实施例的开关电路的结构示意图。如图2所示，开关电路 22包括第一开关子电路221。此外，电压信号线14包括第一电压子信号线141。第一开关子电路221分别与对应的触控信号线21和第一电压子信号线141电连接。
在一些实施例中，第一开关子电路211包括具有开关功能的电路。第一电压子信号线141为高电位信号VGH信号线。
第一开关子电路221在对应的触控信号线21上的触控信号电压值不大于第一预设电压的情况下处于关断状态。第一开关子电路221在对应的触控信号线21上的触控信号电压值大于第一预设电压的情况下处于导通状态。
例如，第一预设电压为正电压。若触控信号线21上的触控信号受到外界静电干扰，触控信号的电压值大于第一预设电压。在这种情况下，第一开关子电路221处于导通状态，从而将第一电压子信号线141提供的电压作为触控信号的电压值。由此确保触控信号线21上的触控信号的电压值不大于第一预设电压，从而避免因触控信号的电压异常而给触控电路的性能造成影响。
相反，若触控信号线21上的触控信号的电压值不大于第一预设电压，则表明触控信号的电压值在正常范围内。在这种情况下，第一开关子电路221处于关断状态。从而触控信号线21上的触控信号不会受到第一电压子信号线141的影响。
图3是根据本公开另一个实施例的开关电路的结构示意图。图3和图2的不同之处在于，在图3所示实施例中，开关电路22还包括第二开关子电路222。此外，电压信号线14包括第二电压子信号线142。第二开关子电路222分别与对应的触控信号线21和第二电压子信号线142电连接。
这里需要说明的是，第一电压子信号线141上的电压值大于第二电压子信号线142上的电压值。例如，第一电压子信号线141上的电压值为正电压，第二电压子信号线142上的电压值为负电压。
在一些实施例中，第二开关子电路222包括具有开关功能的电路。第二电压子信号线142为低电位信号VGL信号线。
第二开关子电路222在对应的触控信号线21上的电压值不大于第二预设电压的情况下处于导通状态。第二开关子电路222在对应的触控信号线21上的电压值大于第二预设电压的情况下处于关断状态。第二预设电压小于第一预设电压。在一些实施例中，第一预设电压为正电压，第二预设电压为负电压。
例如，若触控信号线21受到外界静电干扰，在触控信号线21未传送触控信号的情况下，在触控信号线21上也会产生较小的电压波动。在这种情况下，在触控信号 线21上的电压值不大于第二预设电压的情况下，第二开关子电路222处于导通状态，从而将第二电压子信号线142提供的电压作为触控信号的电压值。由此确保触控信号线21上的触控信号的电压值不会小于第二预设电压，避免因触控信号线21上的电压波动给触控电路的性能造成影响。
相反，若触控信号线21上的触控信号的电压值大于第二预设电压，则表明当前帧触控信号线21上有触控信号传输。在这种情况下，第二开关子电路222处于关断状态。在这种情况下第二电压子信号线142不会对触控信号线21上的触控信号产生影响。
图4是根据本公开又一个实施例的开关电路的结构示意图。图4与图3的不同之处在于，在图4所示实施例中，第一开关子电路221包括第一晶体管Q1，第二开关子电路222包括第二晶体管Q2。
第一晶体管Q1的第一电极Q11和对应的触控信号线21电连接，第一晶体管Q1的第二电极Q12和第一电压子信号线141电连接，第一晶体管Q1的栅极Q13和第一晶体管Q1的第二电极Q12电连接。第二晶体管Q2的第一电极Q21和第二电压子信号线142电连接，第二晶体管Q2的第二电极Q22和对应的触控信号线21电连接，第二晶体管Q2的栅极Q23和第二晶体管Q2的第二电极Q22电连接。
第一晶体管Q1在对应的触控信号线21上的电压值不大于第一预设电压的情况下，第一晶体管Q1的第一电极Q11和第二电极Q12处于关断状态。第一晶体管Q1在对应的触控信号线21上的电压值大于第一预设电压的情况下，第一晶体管Q1的第一电极Q11和第二电极Q12处于导通状态。
第二晶体管Q2在对应的触控信号线21上的电压值不大于第二预设电压的情况下，第二晶体管的第一电极Q21和第二电极Q22处于导通状态。第二晶体管Q2在对应的触控信号线21上的电压值大于第二预设电压的情况下，第二晶体管Q2的第一电极Q21和第二电极Q22处于关断状态。
通过利用第一开关子电路221和第二开关子电路222，能够确保提供给控制电路11的触控信号的电压在预设范围内，从而有效避免因外界静电干扰给触控电路的性能造成影响。
图5是根据本公开另一个实施例的触控电路的结构示意图。图5与图1的不同之处在于，在图5所示实施例中，触控电路还包括多个滤波电路151-15m。滤波电路151-15m和触控信号线121-12m一一对应。每个滤波电路具有第一端和第二端。第一 端与对应的触控信号线电连接，第二端与控制电路11电连接。例如，滤波电路151能够对触控信号线121上的触控信号进行噪声过滤，滤波电路152能够对触控信号线122上的触控信号进行噪声过滤。通过对触控信号进行噪声过滤，从而能够提升触控电路的性能。
在一些实施例中，每个滤波电路中包括RC滤波电路或其它合适的滤波电路。
图6是根据本公开一个实施例的RC滤波电路的结构示意图。
如图6所示，RC滤波电路包括电阻R1、R2和R3，电容C1、C2和C3。电阻R1的第一端R11和触控信号线电连接，电阻R1的第二端R12同电阻R2的第一端R21和电容C1的第一端C11电连接。电阻R2的第二端R22同电阻R3的第一端R31和电容C2的第一端C21电连接。电阻R3的第二端R32同控制电路和电容C3的第一端C31电连接。电容C1的第二端C12、电容C2的第二端C22和电容C3的第二端C32接地。即，电容C1的第二端C12、电容C2的第二端C22和电容C3的第二端C32与触控电路的接地端电连接。
利用滤波电路，能够过滤对应触控信号线上的触控信号中的噪声，从而提升触控电路的性能。
这里需要说明的是，作为示例，在图6所示的RC滤波电路包括了3个电容。当然电容的数量并不局限于此，RC滤波电路中包括的电容数量可多于3个，也可少于3个。
在一些实施例中，利用LTPS(Low Temperature Poly Silicon，低温多晶硅)走线作为电阻。LTPS走线的电阻较大，有利于释放干扰信号。
在一些实施例中，采用栅极(Gate)层走线和源漏(SD)层走线作为RC滤波滤波电路中的电容的两个极板。
图7是根据本公开又一个实施例的触控电路的结构示意图。
图7与图5的不同之处在于，在图7所示实施例中，触控电路还包括闭合线路16、以及公共电压信号线路17。闭合线路16、多条触控信号线121-12m及公共电压信号线路17同层设置，即闭合线路16、多条触控信号线121-12m及公共电压信号线路17位于触控电路中的同一膜层中。例如，每一条触控信号线就是利用位于该同一膜层中的一根金属线构成。闭合线路16将多条触控信号线121-12m和公共电压信号线路17相隔离。即在闭合线路16和多条触控信号线121-12m及公共电压信号线路17所位于的同一平面上，闭合线路16将该平面划分为两个区域，即由闭合线路16包围的第一 区域，以及该平面上除第一区域之外的第二区域，闭合线路16是第一区域和第二区域的边界。多条触控信号线121-12m位于第一区域内。为每条触控信号线配置的开关电路和滤波电路也位于第二区域内。
这里需要说明的是，闭合线路16相当于一个线圈。根据电磁感应原理，公共电压信号线路17上变化的电压信号会产生变化的磁场，所产生的磁场在线圈中产生感应电荷，感应电荷会对所产生的磁场产生屏蔽作用。通过将闭合线路16、多条触控信号线121-12m、以及公共电压信号线路17设置在同一平面上，从而能够有效减小设置在闭合线路16内部的多条触控信号线121-12m受到同层设置的公共电压信号线路17所产生磁场的影响。
在一些实施例中，公共电压信号线路17包括低压电源信号VSS线路。
图8是根据本公开又一个实施例的触控电路的结构示意图。图8与图7的不同之处在于，在图8所示实施例中，闭合线路16和控制电路11通过至少一条空闲的触控线路实现电连接。
例如，空闲的触控线路123的一端与闭合线路16电连接，触控线路123的另一端通过对应的滤波电路153和控制电路11电连接。由此可利用控制电路11对闭合线路16的电压值进行控制。
这里需要说明的是，空闲的触控线路123是未传送触控信号的触控线路。
在一些实施例中，控制电路11通过触控线路123控制闭合线路16接地。由于闭合线路16接地，能够对设置在闭合线路16内部的多条触控信号线121-12m起到更好地电磁屏蔽作用。
图9是根据本公开一个实施例的触控面板的结构示意图。如图9所示，触控面板91中包括触控电路92。触控电路92为如图1至图8中任一实施例涉及的触控电路。
本公开还提供一种显示装置。显示装置包括如图9中任一实施例涉及的触控面板。该显示装置可以为显示器、手机、平板电脑、电视机、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。
图10是根据本公开另一个实施例的触控面板的结构示意图。
如图10所示，触控面板包括显示区1001和周边区1002。显示区1001包括像素驱动电路，触控电路中的开关电路和控制电路位于周边区1002。触控电路中的闭合线路围绕周边区1002闭合设置，触控电路中的开关电路和显示区1001中的像素驱动电路同层设置。
至此，已经详细描述了本公开的实施例。为了避免遮蔽本公开的构思，没有描述本领域所公知的一些细节。本领域技术人员根据上面的描述，完全可以明白如何实施这里公开的技术方案。虽然已经通过示例对本公开的一些特定实施例进行了详细说明，但是本领域的技术人员应该理解，以上示例仅是为了进行说明，而不是为了限制本公开的范围。本领域的技术人员应该理解，可在不脱离本公开的范围和精神的情况下，对以上实施例进行修改或者对部分技术特征进行等同替换。本公开的范围由所附权利要求来限定。

Claims (15)

  1. 一种触控电路，包括：
    多条与控制电路电连接的触控信号线；
    用于提供预设电压的电压信号线；和
    多个开关电路，所述开关电路和所述触控信号线一一对应，所述开关电路分别与对应的触控信号线和所述电压信号线电连接，所述开关电路被配置为在所述对应的触控信号线上的电压值在预设范围内的情况下处于关断状态，还被配置为在所述对应的触控信号线上的电压值不在预设范围内的情况下处于导通状态。
  2. 根据权利要求1所述的触控电路，其中：
    所述电压信号线包括第一电压子信号线；
    所述开关电路包括第一开关子电路，所述第一开关子电路分别与对应的触控信号线和所述第一电压子信号线电连接，所述第一开关子电路在所述对应的触控信号线上的电压值不大于第一预设电压的情况下处于关断状态，在所述对应的触控信号线上的电压值大于第一预设电压的情况下处于导通状态。
  3. 根据权利要求2所述的触控电路，其中：
    所述第一开关子电路包括第一晶体管，所述第一晶体管的第一电极和所述对应的触控信号线电连接，所述第一晶体管的第二电极和所述第一电压子信号线电连接，所述第一晶体管的栅极和所述第一晶体管的第二电极电连接。
  4. 根据权利要求3所述的触控电路，其中：
    所述第一晶体管在所述对应的触控信号线上的电压值不大于第一预设电压的情况下，所述第一晶体管的第一电极和第二电极处于关断状态；
    所述第一晶体管在所述对应的触控信号线上的电压值大于第一预设电压的情况下，所述第一晶体管的第一电极和第二电极处于导通状态。
  5. 根据权利要求2所述的触控电路，其中：
    所述电压信号线还包括第二电压子信号线，其中所述第一电压子信号线上的电压 值大于所述第二电压子信号线上的电压值；
    所述开关电路还包括第二开关子电路，所述第二开关子电路分别与所述对应的触控信号线和所述第二电压子信号线电连接，所述第二开关子电路在所述对应的触控信号线上的电压值不大于第二预设电压的情况下处于导通状态，在所述对应的触控信号线上的电压值大于第二预设电压的情况下处于关断状态。
  6. 根据权利要求5所述的触控电路，其中：
    所述第二开关子电路包括第二晶体管，所述第二晶体管的第一电极和所述第二电压子信号线电连接，所述第二晶体管的第二电极和所述对应的触控信号线电连接，所述第二晶体管的栅极和所述第二晶体管的第二电极电连接。
  7. 根据权利要求6所述的触控电路，其中：
    所述第二晶体管在所述对应的触控信号线上的电压值不大于第二预设电压的情况下，所述第一晶体管的第一电极和第二电极处于导通状态；
    所述第二晶体管在所述对应的触控信号线上的电压值大于第二预设电压的情况下，所述第二晶体管的第一电极和第二电极处于关断状态。
  8. 根据权利要求1-7中任一项所述的触控电路，还包括：
    多个滤波电路，所述滤波电路和所述触控信号线一一对应；
    所述滤波电路的第一端与所述对应的触控信号线电连接，所述滤波电路的第二端与所述控制电路电连接。
  9. 根据权利要求8所述的触控电路，其中：
    所述滤波电路包括RC滤波电路。
  10. 根据权利要求8所述的触控电路，还包括：
    闭合线路，所述闭合线路和所述触控信号线及公共电压信号线路同层设置，且所述闭合线路将所述触控信号线和所述公共电压信号线路相隔离。
  11. 根据权利要求10所述的触控电路，其中：
    所述闭合线路和所述控制电路电连接。
  12. 根据权利要求11所述的触控电路，其中：
    所述闭合线路在所述控制电路的控制下接地。
  13. 一种触控面板，包括如权利要求1-12中任一项所述的触控电路。
  14. 根据权利要求13所述的触控面板，所述触控面板包括显示区和周边区，所述显示区包括像素驱动电路，所述触控电路中的开关电路和控制电路位于所述周边区，其中：
    所述触控电路中的闭合线路围绕所述周边区闭合设置；
    所述开关电路和所述像素驱动电路同层设置。
  15. 一种显示装置，包括如权利要求13或14所述的触控面板。
PCT/CN2020/082563 2020-03-31 2020-03-31 触控电路、触控面板和显示装置 WO2021196010A1 (zh)

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