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WO2021184831A1 - 检测电路、触控面板及电子设备 - Google Patents

检测电路、触控面板及电子设备 Download PDF

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Publication number
WO2021184831A1
WO2021184831A1 PCT/CN2020/133632 CN2020133632W WO2021184831A1 WO 2021184831 A1 WO2021184831 A1 WO 2021184831A1 CN 2020133632 W CN2020133632 W CN 2020133632W WO 2021184831 A1 WO2021184831 A1 WO 2021184831A1
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WO
WIPO (PCT)
Prior art keywords
excitation signal
input terminal
detection circuit
touch panel
amplitude
Prior art date
Application number
PCT/CN2020/133632
Other languages
English (en)
French (fr)
Inventor
刘成
Original Assignee
北京集创北方科技股份有限公司
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Filing date
Publication date
Application filed by 北京集创北方科技股份有限公司 filed Critical 北京集创北方科技股份有限公司
Priority to KR1020227035359A priority Critical patent/KR102721958B1/ko
Priority to EP20925776.5A priority patent/EP4080336A4/en
Priority to JP2022552924A priority patent/JP7450059B2/ja
Publication of WO2021184831A1 publication Critical patent/WO2021184831A1/zh
Priority to US17/876,418 priority patent/US11853098B2/en

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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
    • G06F3/0416—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
    • G06F3/0416—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
    • 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
    • G06F3/044—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
    • G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means

Definitions

  • the present disclosure relates to the field of electronic technology, and in particular to a detection circuit, a touch panel and an electronic device.
  • Touch panels also called touch screens or touch screens have been widely used in various consumer electronic devices, especially capacitive touch panels.
  • One of the capacitive touch panels relies on detection circuits to sense touch actions.
  • the VCOM (reference voltage) electrode on the touch panel is divided into multiple sensor electrodes senor RX (sensor, sensor, Receive, receiving, referred to as RX)
  • RX sensor electrodes
  • RX reference voltage
  • the equivalent capacitance of RX becomes larger, so that the Vout (output voltage) of CA (Charge Amplifier, CA for short) becomes larger.
  • CA Charge Amplifier
  • the present disclosure proposes a detection circuit, a touch panel, and an electronic device to eliminate the influence of parasitic capacitance and avoid the inability to detect a touch action due to the saturation of the output of the charge amplifier.
  • a detection circuit including:
  • the charge amplifier includes a first input terminal, a second input terminal, and an output terminal;
  • a feedback capacitor both ends of which are electrically connected to the first input terminal and the output terminal, respectively, and a first switch is connected in parallel with the feedback capacitor;
  • the sensor electrode is electrically connected to the first input terminal
  • the thin film transistor TFT (Thin Film Transistor) in the touch panel where the detection circuit is located is applied with a first excitation signal
  • the second input terminal is applied with a second excitation signal
  • the first excitation signal is The second excitation signal is in phase, and the amplitude of the first excitation signal is greater than the amplitude of the second excitation signal.
  • the difference between the amplitude of the first excitation signal and the amplitude of the second excitation signal is determined by the amplitude of the second excitation signal, the capacitance value of the first parasitic capacitance, and the second excitation signal.
  • the capacitance value of the parasitic capacitance and the capacitance value of the feedback capacitance are determined, wherein the first parasitic capacitance is the parasitic capacitance generated by the sensor electrode and the source and gate lines of the TFT, and the second The parasitic capacitance is the parasitic capacitance of the sensor electrode to the ground.
  • the amplitude of the first excitation signal and the amplitude of the second excitation signal satisfy a preset numerical relationship, and the preset numerical relationship includes being expressed by the following formula:
  • ⁇ V STIM_HL represents the amplitude difference between the first excitation signal and the second excitation signal
  • V STIML_H represents the high level value of the second excitation signal
  • V STIML_L represents the low level value of the second excitation signal
  • C base1 represents the capacitance value of the first parasitic capacitance
  • C base2 represents the capacitance value of the second parasitic capacitance
  • C fb represents the capacitance value of the feedback capacitor.
  • the equivalent capacitance of the sensor electrode becomes larger, and the voltage at the output terminal becomes larger.
  • a second switch is connected in series between the sensor electrode and the first input terminal.
  • the first excitation signal and the second excitation signal are in-phase square wave signals with the same period.
  • the first input terminal is a negative input terminal
  • the second input terminal is a positive input terminal
  • the touch panel includes a capacitive touch panel.
  • a touch panel includes a capacitive touch panel and includes the above-mentioned circuit.
  • the common electrode of the touch panel is divided to obtain one or more sensor electrodes.
  • an electronic device including the above-mentioned circuit.
  • the first excitation signal VSTMH is set to be in phase with the second excitation signal VSTML, and the amplitude of the first excitation signal VSTMH is greater than the amplitude of the second excitation signal VSTML.
  • the area of the detection circuit can be reduced, and the touch IC (Touch IC, integrated with the detection circuit) can be saved. Touch the area of the chip).
  • Figure 1 shows an equivalent circuit diagram of a detection circuit.
  • Fig. 2 shows a circuit diagram of a detection circuit provided by an embodiment of the present disclosure.
  • Fig. 3 shows an equivalent circuit diagram of a detection circuit provided by an embodiment of the present disclosure.
  • Fig. 4 is a block diagram showing an electronic device according to an exemplary embodiment.
  • the “plurality” appearing in the embodiments of the present disclosure refers to two or more than two.
  • the first, second, etc. descriptions appearing in the embodiments of the present disclosure are only used to illustrate and distinguish the description objects, and there is no order, and it does not mean that the number is particularly limited in the embodiments of the present disclosure, and does not constitute an implementation of the present disclosure. Any limitations of the case.
  • Figure 1 shows an equivalent circuit diagram of a general detection circuit.
  • the principle of the circuit shown in Figure 1 to realize touch detection is: first precharge the sensor electrode RX (VCOM), and then connect it to the input of the charge amplifier through the control switch, so that the charge of RX will be transferred to the charge amplifier At the output terminal of CA (Charge Amplifier, CA for short), because the precharge voltage is constant, when the capacitance of RX changes, the output voltage Vout of the charge amplifier CA obtained is different.
  • CA Charge Amplifier, CA for short
  • ⁇ V represents the amount of change in the output voltage
  • V stim represents the voltage value of the precharge
  • ⁇ C represents the amount of change in the equivalent capacitance of the RX.
  • the sensor RX (sensor electrode) will have a large parasitic capacitance, including the parasitic of the wiring, such as RX (sensor electrode) and the transistors in the TFT (Thin Film Transistor) layer of the touch panel
  • the parasitic capacitance Cbase1 generated by the source line source line and the gate line gate line. And also includes the parasitic capacitance Cbase2 of RX to ground.
  • Cbase1 represents the parasitic capacitance of the sensor, source line and gate line
  • Cbase2 represents the parasitic capacitance of RX to ground.
  • the compensation method adopted in Fig. 1 is to apply the in-phase excitation signal Stimulus to the parasitic capacitance Cbase1 and the charge amplifier to eliminate the parasitic capacitance Cbase1.
  • a capacitance compensation circuit (as shown in the dashed box) is used.
  • This capacitance compensation circuit charges the internal capacitance Ccomp in advance, and then introduces the precharged charge to RX (VCOM) to achieve the purpose of eliminating the parasitic capacitance Cbase2. In this way, the detection circuit needs to occupy a larger chip area, or a chip with a larger area is required.
  • Fig. 2 shows a circuit diagram of a detection circuit provided by an embodiment of the present disclosure.
  • the circuit may include:
  • the charge amplifier CA includes a first input terminal -, a second input terminal +, and an output terminal Vout;
  • Two ends of the feedback capacitor Cfb are electrically connected to the first input terminal-and the output terminal Vout, and the feedback capacitor Cfb is connected in parallel with a first switch S1;
  • the sensor electrode RX is electrically connected to the first input terminal
  • the thin film transistor TFT in the touch panel where the detection circuit is located is applied with a first excitation signal VSTMH (for example, the first excitation signal can be applied to the gate line of the TFT), and the second input terminal is applied with a second excitation signal.
  • VSTMH for example, the first excitation signal can be applied to the gate line of the TFT
  • the second input terminal is applied with a second excitation signal.
  • Signal VSTML, the first excitation signal VSTMH and the second excitation signal VSTML are in phase, and the amplitude of the first excitation signal VSTML is greater than the amplitude of the second excitation signal VSTML.
  • the touch panel may be a capacitive touch panel.
  • the influence of the parasitic capacitance on the touch action detection can be reduced or eliminated
  • there is no need to add additional hardware which can reduce the area of the detection circuit, thereby reducing the area of the touch IC (Touch IC) where it is located.
  • FIG. 3 is an equivalent circuit diagram of the detection circuit shown in FIG. 2 in this example.
  • the difference between the amplitude of the first excitation signal and the amplitude of the second excitation signal The value may be determined by the amplitude of the second excitation signal VSTML, the capacitance value of the first parasitic capacitance Cbase1, the capacitance value of the second parasitic capacitance Cbase2, and the capacitance value of the feedback capacitance Cfb.
  • the first parasitic capacitance Cbase1 is the parasitic capacitance generated by the sensor electrode RX and the source line and gate line of the TFT shown in FIG. 1, and the second parasitic capacitance Cbase2 is the sensor electrode RX.
  • ⁇ C represents the variable equivalent capacitance of the sensor electrode RX. Specifically, in response to the sensor electrode being touched, the equivalent capacitance of the sensor electrode becomes larger, causing the voltage Vout of the output terminal to become larger.
  • the amplitude of the first excitation signal and the amplitude of the second excitation signal satisfy a preset numerical relationship, and the preset numerical relationship includes being expressed by the following formula:
  • ⁇ V STIM_HL represents the amplitude difference between the first excitation signal and the second excitation signal
  • V STIML_H represents the high level value of the second excitation signal
  • V STIML_L represents the low level value of the second excitation signal
  • C base1 represents the capacitance value of the first parasitic capacitance
  • C base2 represents the capacitance value of the second parasitic capacitance
  • C fb represents the capacitance value of the feedback capacitor.
  • the amplitude of the first excitation signal may refer to the difference between the high-level value and the low-level value of the first excitation signal
  • the amplitude of the second excitation signal may refer to the second excitation signal. The difference between the high-level value and the low-level value of the excitation signal.
  • a second switch S2 is connected in series between the sensor electrode RX and the first input terminal.
  • the second switch S2 can be used to reset the charge of the electrode RX. After the detection of one touch action is completed, S2 can be controlled to be turned off to charge the electrode RX for the next touch action detection.
  • the first excitation signal and the second excitation signal are in-phase square wave signals with the same period.
  • the first excitation signal and the second excitation signal may also be in other forms, which are not limited in the present disclosure.
  • the first input terminal is a negative input terminal
  • the second input terminal is a positive input terminal
  • the first step reset phase, the positive input terminal of CA is connected to the low potential of VSTML, the first switch S1 of the feedback capacitor Cfb is closed, CA forms a buffer buffer, the lower plate of the equivalent capacitor Cbase1 (ie The TFT layer is connected to the low potential of VSTIMH (first excitation signal).
  • Step 2 Integral phase: the switch S1 of the feedback capacitor Cfb is turned off, the positive terminal voltage of CA changes from low level of VSTML (second excitation signal) to high level, and the excitation signal VSTIMH applied to Cbase1 is also Jump from low level to high level.
  • VSTML second excitation signal
  • the third step reset phase, the positive terminal of CA is connected to the high potential of VSTML, the switch S1 of Cfb is closed, and CA forms a buffer form; the bottom plate of Cbase1 is connected to the high potential of VSTIMH.
  • Step 4 Integral phase: the switch S1 of the feedback capacitor Cfb is turned off, the positive terminal voltage of CA changes from the high level of VSTML to low level, and the excitation signal VSTIMH applied to Cbase1 also jumps from high level It is low level.
  • the above four steps can complete a touch action detection, and complete the sampling and quantization of a complete excitation signal cycle.
  • equation (2) is equal to equation (3), and we get:
  • V STIML_L * C base2 + (V STIML_L -V STIMH_L) * C base1 V STIML_H * C base2 + (V STIML_H -V STIMH_H) * C base1 + (V STIML_H -V OUT) * C fb of formula (4)
  • V STIM_HL (V STIMH_H -V STIMH_L )-(V STIML_H -V STIML_L )
  • VSTIMH VSTIML
  • the detection circuit shown in Figure 1 is used as the TOUCH (touch) part of the ITD (Integrated-touch-driver) chip.
  • the area of the compensation capacitor and the circuit occupies about 30% of the area, and Figure 2 is used 3
  • the corresponding embodiment can reduce the chip area by 30%.
  • the detection circuit provided by the foregoing embodiments, by applying the above and making the two meet the above-mentioned preset value relationship, the first parasitic capacitance Cbase1 and the second parasitic capacitance Cbase2 can be eliminated, thereby avoiding The influence of parasitic capacitance on the accuracy of touch detection. While avoiding the influence of parasitic capacitance on the accuracy of touch action detection, the use of the above-mentioned detection circuit does not require additional hardware, which can effectively reduce the area of the detection circuit, thereby saving the integrated circuit of the detection circuit. Touch IC (Touch IC) area
  • the present disclosure also provides a touch panel.
  • the touch panel includes a capacitive touch panel and includes the detection circuit described above.
  • the common electrode VCOM of the touch panel can be divided to obtain one or more sensor electrodes RX.
  • Fig. 4 is a block diagram showing an electronic device 800 including the above touch panel according to an exemplary embodiment.
  • the electronic device 800 may include the above touch panel.
  • the electronic device 800 may be a mobile phone, a computer, a digital broadcasting electronic device, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.
  • the electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input/output (I/O) interface 812, and a sensor component 814 , And communication component 816.
  • the processing component 802 generally controls the overall operations of the electronic device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations.
  • the processing component 802 may include one or more processors 820 to execute instructions.
  • the processing component 802 may include one or more modules to facilitate the interaction between the processing component 802 and other components.
  • the processing component 802 may include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802.
  • the memory 804 is configured to store various types of data to support operations in the electronic device 800. Examples of these data include instructions for any application or method to operate on the electronic device 800, contact data, phone book data, messages, pictures, videos, etc.
  • the memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable and Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic Disk or Optical Disk.
  • SRAM static random access memory
  • EEPROM electrically erasable programmable read-only memory
  • EPROM erasable and Programmable Read Only Memory
  • PROM Programmable Read Only Memory
  • ROM Read Only Memory
  • Magnetic Memory Flash Memory
  • Magnetic Disk Magnetic Disk or Optical Disk.
  • the power supply component 806 provides power for various components of the electronic device 800.
  • the power supply component 806 may include a power management system, one or more power supplies, and other components associated with the generation, management, and distribution of power for the electronic device 800.
  • the multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and the user.
  • the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch panel to receive input signals from the user.
  • the touch panel includes one or more touch sensors to sense touch, sliding, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure related to the touch or slide operation.
  • the multimedia component 808 includes a front camera and/or a rear camera. When the electronic device 800 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera can receive external multimedia data. Each front camera and rear camera can be a fixed optical lens system or have focal length and optical zoom capabilities.
  • the audio component 810 is configured to output and/or input audio signals.
  • the audio component 810 includes a microphone (MIC), and when the electronic device 800 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode, the microphone is configured to receive an external audio signal.
  • the received audio signal may be further stored in the memory 804 or transmitted via the communication component 816.
  • the audio component 810 further includes a speaker for outputting audio signals.
  • the I/O interface 812 provides an interface between the processing component 802 and a peripheral interface module.
  • the above-mentioned peripheral interface module may be a keyboard, a click wheel, a button, and the like. These buttons may include, but are not limited to: home button, volume button, start button, and lock button.
  • the sensor component 814 includes one or more sensors for providing the electronic device 800 with various aspects of state evaluation.
  • the sensor component 814 can detect the on/off status of the electronic device 800 and the relative positioning of the components.
  • the component is the display and the keypad of the electronic device 800.
  • the sensor component 814 can also detect the electronic device 800 or the electronic device 800.
  • the position of the component changes, the presence or absence of contact between the user and the electronic device 800, the orientation or acceleration/deceleration of the electronic device 800, and the temperature change of the electronic device 800.
  • the sensor component 814 may include a proximity sensor configured to detect the presence of nearby objects when there is no physical contact.
  • the sensor component 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications.
  • the sensor component 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
  • the communication component 816 is configured to facilitate wired or wireless communication between the electronic device 800 and other devices.
  • the electronic device 800 can access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof.
  • the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel.
  • the communication component 816 further includes a near field communication (NFC) module to facilitate short-range communication.
  • the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.
  • RFID radio frequency identification
  • IrDA infrared data association
  • UWB ultra-wideband
  • Bluetooth Bluetooth
  • the electronic device 800 may be implemented by one or more application-specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field-available Program gate array (FPGA), controller, microcontroller, microprocessor or other electronic components to achieve.
  • ASIC application-specific integrated circuits
  • DSP digital signal processors
  • DSPD digital signal processing devices
  • PLD programmable logic devices
  • FPGA field-available Program gate array
  • controller microcontroller, microprocessor or other electronic components to achieve.
  • These computer-readable program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine that makes these instructions when executed by the processor of the computer or other programmable data processing device , A device that implements the functions/actions specified in one or more blocks in the flowcharts and/or block diagrams is produced. It is also possible to store these computer-readable program instructions in a computer-readable storage medium. These instructions make computers, programmable data processing apparatuses, and/or other devices work in a specific manner. Thus, the computer-readable medium storing the instructions includes An article of manufacture, which includes instructions for implementing various aspects of the functions/actions specified in one or more blocks in the flowcharts and/or block diagrams.
  • each block in the flowchart or block diagram may represent a module, program segment, or part of an instruction, and the module, program segment, or part of an instruction contains one or more components for realizing the specified logical function.
  • Executable instructions may also occur in a different order from the order marked in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, or they can sometimes be executed in the reverse order, depending on the functions involved.
  • each block in the block diagram and/or flowchart, and the combination of the blocks in the block diagram and/or flowchart can be implemented by a dedicated hardware-based system that performs the specified functions or actions Or it can be realized by a combination of dedicated hardware and computer instructions.

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Abstract

一种检测电路、触控面板及电子设备，所述电路包括：电荷放大器，包括第一输入端、第二输入端、输出端；反馈电容，两端分别与所述第一输入端和所述输出端电性连接，所述反馈电容并联有第一开关；传感器电极，与所述第一输入端电性连接；所述检测电路所在的触控面板中的薄膜晶体管TFT施加有第一激励信号，所述第二输入端施加有第二激励信号，所述第一激励信号与所述第二激励信号同相，且所述第一激励信号的幅度大于所述第二激励信号的幅度。可以消除寄生电容的影响，避免因为电荷放大器输出饱和而无法检测出触摸动作。

Description

检测电路、触控面板及电子设备 技术领域
本公开涉及电子技术领域，尤其涉及一种检测电路、触控面板及电子设备。
背景技术
触控面板(Touch Panel，又称触摸屏或触控屏)已经广泛应用于各种用户电子设备，尤其是电容式触控面板。其中一种电容式触控面板是依靠检测电路感应触摸动作，具体是将触控面板上的VCOM(基准电压)电极划分为多个传感器电极senor RX(sensor，传感器，Receive，接收，简称RX)，如图1所示，当sensor RX(VCOM)被触摸时，RX的等效电容变大，使得CA(Charge Amplifier，电荷放大器，简称CA)的Vout(输出电压)变大。这样就可以根据所述输出电压Vout的变化检测出触摸动作。
但是，由于传感器电极存在较大的寄生电容，包括走线的寄生电容，主要是传感器电极与source line(源极线)以及gate line(栅极线)的寄生电容Cbase1，以及对地寄生电容Cbase2，而这些寄生电容往往电容值较大，会导致电荷放大器CA的输出饱和，而无法检测出触摸动作。
发明内容
本公开提出了一种检测电路、触控面板及电子设备，以消除寄生电容的影响，避免因为电荷放大器输出饱和而无法检测出触摸动作。
根据本公开的一方面，提供了一种检测电路，所述电路包括：
电荷放大器，包括第一输入端、第二输入端、输出端；
反馈电容，两端分别与所述第一输入端和所述输出端电性连接，所述反馈电容并联有第一开关；
传感器电极，与所述第一输入端电性连接；
所述检测电路所在的触控面板中的薄膜晶体管TFT(Thin Film Transistor，薄膜晶体管)施加有第一激励信号，所述第二输入端施加有第二激励信号，所述第一激励信号与所述第二激励信号同相，且所述第一激励信号的幅度大于所述第二激励信号的幅度。
在一种可能的实现方式中，所述第一激励信号的幅度与所述第二激励信号的幅度的差值，由所述第二激励信号的幅度、第一寄生电容的电容值、第二寄生电容的电容值、以及所述反馈电容的电容值确定，其中，所述第一寄生电容为所述传感器电极与所述TFT的源极线、栅极线产生的寄生电容，所述第二寄生电容为所述传感器电极的对地寄生电容。
在一种可能的实现方式中，所述第一激励信号的幅度与所述第二激励信号的幅度满足预设数值关系，所述预设数值关系包括采用下述公式表示：
Figure PCTCN2020133632-appb-000001
式中，ΔV STIM_HL表示所述第一激励信号与所述第二激励信号的幅度差值；
V STIML_H表示所述第二激励信号的高电平值；
V STIML_L表示所述第二激励信号的低电平值；
C base1表示所述第一寄生电容的电容值；
C base2表示所述第二寄生电容的电容值；
C fb表示所述反馈电容的电容值。
在一种可能的实现方式中，响应于所述传感器电极被触摸，所述传感器电极的等效电容变大，所述输出端的电压变大。
在一种可能的实现方式中，所述传感器电极和所述第一输入端之间串联有第二开关。
在一种可能的实现方式中，所述第一激励信号和所述第二激励信号为周期相同的同相方波信号。
在一种可能的实现方式中，所述第一输入端为负向输入端，所述第二输入端为正向输入端。
在一种可能的实现方式中，所述触控面板包括电容式触控面板。
根据本公开另一方面，提供了一种触控面板，所述触控面板包括电容式触控面板，包括上述电路。
在一种可能的实现方式中，所述触控面板的公共电极被划分得到一个或多个所述传感器电极。
根据本公开另一方面，提供了一种电子设备，包括上述电路。
根据本公开的各方面的实现方式，设置第一激励信号VSTMH与所述第二激励信号VSTML同相，且所述第一激励信号VSTMH的幅度大于所述第二激励信号VSTML的幅度。从而可以减少甚至避免寄生电容对触摸动作检测准确性的影响，并且不需要增加额外的硬件，可以减小所述检测电路的面积，进而可以节省集成有所述检测电路的触摸芯片(Touch IC，触摸芯片)的面积。
根据下面参考附图对示例性实施例的详细说明，本公开的其它特征及方面将变得清楚。
附图说明
包含在说明书中并且构成说明书的一部分的附图与说明书一起示出了本公开的示例性实施例、特征和方面，并且用于解释本公开的原理。
图1示出一种检测电路的等效电路图。
图2示出本公开一种实施例提供的一种检测电路的电路图。
图3示出本公开一种实施例提供的一种检测电路的等效电路图。
图4是根据一示例性实施例示出的一种电子设备的框图。
具体实施方式
以下将参考附图详细说明本公开的各种示例性实施例、特征和方面。附图中相同的附图标记表示功能相同或相似的元件。尽管在附图中示出了实施例的各种方面，但是除非特别指出，不必按比例绘制附图。
在这里专用的词“示例性”意为“用作例子、实施例或说明性”。这里作为“示例性”所说明的任何实施例不必解释为优于或好于其它实施例。
另外，为了更好的说明本公开，在下文的具体实施方式中给出了众多的具体细节。本领域技术人员应当理解，没有某些具体细节，本公开同样可以实施。在一些实例中，对于本领域技术人员熟知的方法、手段、元件和电路未作详细描述，以便于凸显本公开的主旨。
应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/“，表示前后关联对象是一种“或”的关系。
本公开实施例中出现的“多个”是指两个或两个以上。本公开实施例中 出现的第一、第二等描述，仅作示意与区分描述对象之用，没有次序之分，也不表示本公开实施例中对个数的特别限定，不能构成对本公开实施例的任何限制。
图1示出了一种一般性的检测电路的等效电路图。图1所示的电路实现触摸检测的原理是：先对传感器电极RX(VCOM)进行一次预充电，然后通过控制开关把它接入电荷放大器的输入端，这样RX的电荷就会转移到电荷放大器CA(Charge Amplifier，简称CA)的输出端，由于预充的电压一定，当RX的电容变化时，得到的电荷放大器CA的输出电压Vout就不同。当有手指触摸时，RX的等效电容变大，因此使得电荷放大器CA的输出电压Vout也变大，即电荷放大器CA的输出电压变化量为：
Figure PCTCN2020133632-appb-000002
式(1)中，ΔV表示所述输出电压变化量；
V stim表示所述预充的电压值；
ΔC表示所述RX的等效电容的变化量。
这样就可以根据电荷放大器的输出电压的变化ΔV检测出是否有触摸。
但是在实际检测中，sensor RX(传感器电极)会存在较大的寄生电容，包括走线的寄生，比如RX(传感器电极)与触控面板的TFT(Thin Film Transistor，薄膜晶体管)层中各晶体管的源极线source line以及栅极线gate line产生的寄生电容Cbase1。以及还包括RX的对地寄生电容Cbase2。图1中，Cbase1代表sensor(传感器)和source line(源极线)以及gate line(栅极线)的寄生电容，Cbase2代表RX的对地寄生电容。
而由于这些寄生电容的电容值较大(多达几百pF)，会导致电荷放大器的输出饱和，为了使得电荷放大器工作在线性区间，需要对RX的寄生电容进行补偿以消除寄生电容，使得电荷放大器看到的等效输入电容比较小。图1中采用的补偿方式是对寄生电容Cbase1和电荷放大器施加同相的激励信号Stimulus(激励)，来消除寄生电容Cbase1。而对于寄生电容Cbase2的消除，则使用了一个电容补偿电路(如虚线框内所示)。这个电容补偿电路预先对内部的电容Ccomp进行充电，然后把预充的电荷导入到RX(VCOM)上以达到消除寄生电容Cbase2的目的。这样需要所述检测电路占用更大的芯片面积，或者说需要更大面积的芯片。
图2示出本公开一种实施例提供的一种检测电路的电路图。具体的，如图2所示，所述电路可以包括：
电荷放大器CA，包括第一输入端-、第二输入端+、输出端Vout；
反馈电容Cfb，两端分别与所述第一输入端-和所述输出端Vout电性连接，所述反馈电容Cfb并联有第一开关S1；
传感器电极RX，与所述第一输入端-电性连接；
所述检测电路所在的触控面板中的薄膜晶体管TFT施加有第一激励信号VSTMH(例如，第一激励信号可施加在TFT的栅极线上)，所述第二输入端施加有第二激励信号VSTML，所述第一激励信号VSTMH与所述第二激励信号VSTML同相，且所述第一激励信号VSTMH的幅度大于所述第二激励信号VSTML的幅度。
其中，所述触控面板可以是电容式触控面板。
通过设置第一激励信号VSTMH与所述第二激励信号VSTML同相，且所 述第一激励信号VSTMH的幅度大于所述第二激励信号VSTML的幅度，可降低或消除寄生电容对触摸动作检测的影响，另一方面还不需要增加额外的硬件，可以减小所述检测电路的面积，进而可以减小所在的触摸芯片(Touch IC)的面积
所述第一激励信号的幅度与所述第二激励信号的幅度的差值可以根据需要选择，以能够达到降低或消除寄生电容对触摸动作检测的影响的需要为准，本公开对此不做限制。图3是本例中图2所示检测电路的等效电路图，如图3所示，本公开一种实施例中，所述第一激励信号的幅度与所述第二激励信号的幅度的差值，可以由所述第二激励信号VSTML的幅度、第一寄生电容Cbase1的电容值、第二寄生电容Cbase2的电容值、以及所述反馈电容Cfb的电容值确定。其中，所述第一寄生电容Cbase1为所述传感器电极RX与图1所示的所述TFT的源极线、栅极线产生的寄生电容，所述第二寄生电容Cbase2为所述传感器电极RX的对地寄生电容。其中，ΔC表示所述传感器电极RX的可变的等效电容，具体的，响应于所述传感器电极被触摸，所述传感器电极的等效电容变大，致使所述输出端的电压Vout变大。
本公开一种实施例中，所述第一激励信号的幅度与所述第二激励信号的幅度满足预设数值关系，所述预设数值关系包括采用下述公式表示：
Figure PCTCN2020133632-appb-000003
式中，ΔV STIM_HL表示所述第一激励信号与所述第二激励信号的幅度差值；
V STIML_H表示所述第二激励信号的高电平值；
V STIML_L表示所述第二激励信号的低电平值；
C base1表示所述第一寄生电容的电容值；
C base2表示所述第二寄生电容的电容值；
C fb表示所述反馈电容的电容值。
其中，所述第一激励信号的幅度可以指的是所述第一激励信号的高电平值与低电平值的差值，所述第二激励信号的幅度可以指的是所述第二激励信号的高电平值与低电平值的差值。
本公开一种实施例中，所述传感器电极RX和所述第一输入端-之间串联有第二开关S2。所述第二开关S2可以用于重置所述电极RX的电荷，当一次触摸动作检测完成后，可以控制S2断开，以对所述电极RX进行充电，以进行下一次触摸动作检测。
本公开一种实施例中，所述第一激励信号和所述第二激励信号为周期相同的同相方波信号。第一激励信号和第二激励信号也可以为其他形式，本公开对此不做限定。
本公开一种实施例中，所述第一输入端为负向输入端，所述第二输入端为正向输入端。
下面结合图3所示的检测电路的等效电路图，说明所述检测电路消除所述寄生电容Cbase1和Cbase2的工作原理：
第一步：reset相位，CA的正向输入端接VSTIML的低电位，反馈电容Cfb的所述第一开关S1关闭，CA结成缓冲器buffer的形式，等效电容Cbase1的下极板(即TFT层)接VSTIMH(第一激励信号)的低电位。
第二步：积分相位：反馈电容Cfb的开关S1断开，CA的正向端电压由VSTIML(第二激励信号)的低电平跳变为高电平，同时对Cbase1施加的激 励信号VSTIMH也由低电平跳变为高电平。
第三步：reset相位，CA的正向端接VSTIML的高电位，Cfb的开关S1关闭，CA结成buffer的形式；Cbase1的下极板接VSTIMH的高电位。
第四步：积分相位：反馈电容Cfb的开关S1断开，CA的正向端电压由VSTIML的高电平跳变为低电平，同时对Cbase1施加的激励信号VSTIMH也由高电平跳变为低电平。
以上四步可以完成一次触摸动作检测，并且完成一个完整的激励信号周期的采样量化。
以VSTIM(激励信号)从低跳变到高电平(即从上述第一步到第二步)为例来说：
在reset相位，CA负相端的电荷为：
V sTIML_L*C base2+(V STIML_L-V STIMH_L)*C base1       式(2)
在积分相位，CA负相端的电荷为：
V STIML_H*C base2+(V STIML_H-V STIMH_H)*C base1+(V STIMLH-V OUT)*C fb     式(3)
根据电荷守恒，式(2)等于式(3)，得到：
V STIML_L*C base2+(V STIML_L-V STIMH_L)*C base1＝V STIML_H*C base2+(V STIML_H-V STIMH_H)*C base1+(V STIML_H-V OUT)*C fb  式(4)
两个激励信号VSTIM的幅度差值为：
ΔV STIM_HL＝(V STIMH_H-V STIMH_L)-(V STIML_H-V STIML_L)
那么由式(4)可以得到：
Figure PCTCN2020133632-appb-000004
即只要施加给Cbase1的第一激励信号的幅度与施加给CA的信号幅度的 差值保持式(5)的数值关系就可以消除多余的寄生电容。比如如果Vout＝(VSTIML+VSTIMH)/2，那么：根据电荷守恒，式(2)等于式(3)得到：
Figure PCTCN2020133632-appb-000005
得出VSTIMH和VSTIML的差值为：
Figure PCTCN2020133632-appb-000006
即在这种条件下，只要所述第一激励信号的幅度与所述第二激励信号的幅度满足式(7)的关系就可以消除寄生电容的影响。
另外，在有效消除寄生电容的同时，相对于图1所示的技术电容消除方式，还可以有效减小检测电路的占用的芯片面积，进而可以减小芯片的面积。图1所示的检测电路作为ITD(Integrated-touch-driver，集成触摸驱动)芯片中的TOUCH(触摸)部分，补偿电容和电路的面积大约占到30％的面积，而利用图2、图3对应的实施方式，可以减少30％的芯片面积。
利用上述各实施例提供的检测电路的实施方式，通过施加所述，并使二者满足上述的预设数值关系，可以消除所述第一寄生电容Cbase1和所述第二寄生电容Cbase2，从而避免寄生电容对触摸动作检测准确性的影响。而在实现避免寄生电容对触摸动作检测准确性的影响的同时，采用上述检测电路，不需要增加额外的硬件，可以有效减小所述检测电路的面积，进而可以节省集成有所述检测电路的触摸芯片(Touch IC，触摸芯片)的面积
基于上述各实施例所述的一种检测电路，本公开还提供一种触控面板，所述触控面板包括电容式触控面板，包括上述检测电路。
本公开一种实施例中，所述触控面板的公共电极VCOM可以被划分得到 一个或多个所述传感器电极RX。
图4是根据一示例性实施例示出的一种包含上述触控面板的电子设备800的框图，电子设备800可以包括上述的触控面板。电子设备800可以是移动电话，计算机，数字广播电子设备，消息收发设备，游戏控制台，平板设备，医疗设备，健身设备，个人数字助理等。
参照图4，电子设备800可以包括以下一个或多个组件：处理组件802，存储器804，电源组件806，多媒体组件808，音频组件810，输入/输出(I/O)的接口812，传感器组件814，以及通信组件816。
处理组件802通常控制电子设备800的整体操作，诸如与显示，电话呼叫，数据通信，相机操作和记录操作相关联的操作。处理组件802可以包括一个或多个处理器820来执行指令。此外，处理组件802可以包括一个或多个模块，便于处理组件802和其他组件之间的交互。例如，处理组件802可以包括多媒体模块，以方便多媒体组件808和处理组件802之间的交互。
存储器804被配置为存储各种类型的数据以支持在电子设备800的操作。这些数据的示例包括用于在电子设备800上操作的任何应用程序或方法的指令，联系人数据，电话簿数据，消息，图片，视频等。存储器804可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随机存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
电源组件806为电子设备800的各种组件提供电力。电源组件806可以包括电源管理系统，一个或多个电源，及其他与为电子设备800生成、管理和 分配电力相关联的组件。
多媒体组件808包括在所述电子设备800和用户之间的提供一个输出接口的屏幕。在一些实施例中，屏幕可以包括液晶显示器(LCD)和触摸面板(TP)。如果屏幕包括触摸面板，屏幕可以被实现为触控面板，以接收来自用户的输入信号。触摸面板包括一个或多个触摸传感器以感测触摸、滑动和触摸面板上的手势。所述触摸传感器可以不仅感测触摸或滑动动作的边界，而且还检测与所述触摸或滑动操作相关的持续时间和压力。在一些实施例中，多媒体组件808包括一个前置摄像头和/或后置摄像头。当电子设备800处于操作模式，如拍摄模式或视频模式时，前置摄像头和/或后置摄像头可以接收外部的多媒体数据。每个前置摄像头和后置摄像头可以是一个固定的光学透镜系统或具有焦距和光学变焦能力。
音频组件810被配置为输出和/或输入音频信号。例如，音频组件810包括一个麦克风(MIC)，当电子设备800处于操作模式，如呼叫模式、记录模式和语音识别模式时，麦克风被配置为接收外部音频信号。所接收的音频信号可以被进一步存储在存储器804或经由通信组件816发送。在一些实施例中，音频组件810还包括一个扬声器，用于输出音频信号。
I/O接口812为处理组件802和外围接口模块之间提供接口，上述外围接口模块可以是键盘，点击轮，按钮等。这些按钮可包括但不限于：主页按钮、音量按钮、启动按钮和锁定按钮。
传感器组件814包括一个或多个传感器，用于为电子设备800提供各个方面的状态评估。例如，传感器组件814可以检测到电子设备800的打开/关闭状态，组件的相对定位，例如所述组件为电子设备800的显示器和小键盘，传 感器组件814还可以检测电子设备800或电子设备800一个组件的位置改变，用户与电子设备800接触的存在或不存在，电子设备800方位或加速/减速和电子设备800的温度变化。传感器组件814可以包括接近传感器，被配置用来在没有任何的物理接触时检测附近物体的存在。传感器组件814还可以包括光传感器，如CMOS或CCD图像传感器，用于在成像应用中使用。在一些实施例中，该传感器组件814还可以包括加速度传感器，陀螺仪传感器，磁传感器，压力传感器或温度传感器。
通信组件816被配置为便于电子设备800和其他设备之间有线或无线方式的通信。电子设备800可以接入基于通信标准的无线网络，如WiFi，2G或3G，或它们的组合。在一个示例性实施例中，通信组件816经由广播信道接收来自外部广播管理系统的广播信号或广播相关信息。在一个示例性实施例中，所述通信组件816还包括近场通信(NFC)模块，以促进短程通信。例如，在NFC模块可基于射频识别(RFID)技术，红外数据协会(IrDA)技术，超宽带(UWB)技术，蓝牙(BT)技术和其他技术来实现。
在示例性实施例中，电子设备800可以被一个或多个应用专用集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理设备(DSPD)、可编程逻辑器件(PLD)、现场可编程门阵列(FPGA)、控制器、微控制器、微处理器或其他电子元件实现。
这里参照根据本公开实施例的方法、装置(系统)的流程图和/或框图描述了本公开的各个方面。应当理解，流程图和/或框图的每个方框以及流程图和/或框图中各方框的组合，都可以由计算机可读程序指令实现。
这些计算机可读程序指令可以提供给通用计算机、专用计算机或其它可 编程数据处理装置的处理器，从而生产出一种机器，使得这些指令在通过计算机或其它可编程数据处理装置的处理器执行时，产生了实现流程图和/或框图中的一个或多个方框中规定的功能/动作的装置。也可以把这些计算机可读程序指令存储在计算机可读存储介质中，这些指令使得计算机、可编程数据处理装置和/或其他设备以特定方式工作，从而，存储有指令的计算机可读介质则包括一个制造品，其包括实现流程图和/或框图中的一个或多个方框中规定的功能/动作的各个方面的指令。
也可以把计算机可读程序指令加载到计算机、其它可编程数据处理装置、或其它设备上，使得在计算机、其它可编程数据处理装置或其它设备上执行一系列操作步骤，以产生计算机实现的过程，从而使得在计算机、其它可编程数据处理装置、或其它设备上执行的指令实现流程图和/或框图中的一个或多个方框中规定的功能/动作。
附图中的流程图和框图显示了根据本公开的多个实施例的系统、方法和计算机程序产品的可能实现的体系架构、功能和操作。在这点上，流程图或框图中的每个方框可以代表一个模块、程序段或指令的一部分，所述模块、程序段或指令的一部分包含一个或多个用于实现规定的逻辑功能的可执行指令。在有些作为替换的实现中，方框中所标注的功能也可以以不同于附图中所标注的顺序发生。例如，两个连续的方框实际上可以基本并行地执行，它们有时也可以按相反的顺序执行，这依所涉及的功能而定。也要注意的是，框图和/或流程图中的每个方框、以及框图和/或流程图中的方框的组合，可以用执行规定的功能或动作的专用的基于硬件的系统来实现，或者可以用专用硬件与计算机指令的组合来实现。
以上已经描述了本公开的各实施例，上述说明是示例性的，并非穷尽性的，并且也不限于所披露的各实施例。在不偏离所说明的各实施例的范围和精神的情况下，对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。本文中所用术语的选择，旨在最好地解释各实施例的原理、实际应用或对市场中的技术的改进，或者使本技术领域的其它普通技术人员能理解本文披露的各实施例。

Claims (11)

  1. 一种检测电路，其特征在于，所述电路包括：
    电荷放大器，包括第一输入端、第二输入端、输出端；
    反馈电容，两端分别与所述第一输入端和所述输出端电性连接，所述反馈电容并联有第一开关；
    传感器电极，与所述第一输入端电性连接；
    所述检测电路所在的触控面板中的薄膜晶体管施加有第一激励信号，所述第二输入端施加有第二激励信号，所述第一激励信号与所述第二激励信号同相，且所述第一激励信号的幅度大于所述第二激励信号的幅度。
  2. 根据权利要求1所述的检测电路，其特征在于，所述第一激励信号的幅度与所述第二激励信号的幅度的差值，由所述第二激励信号的幅度、第一寄生电容的电容值、第二寄生电容的电容值、以及所述反馈电容的电容值确定，其中，所述第一寄生电容为所述传感器电极与所述TFT的源极线、栅极线产生的寄生电容，所述第二寄生电容为所述传感器电极的对地寄生电容。
  3. 如权利要求2所述的检测电路，其特征在于，所述第一激励信号的幅度与所述第二激励信号的幅度满足预设数值关系，所述预设数值关系包括采用下述公式表示：
    Figure PCTCN2020133632-appb-100001
    式中，ΔV STIM_HL表示所述第一激励信号与所述第二激励信号的幅度差值；
    V STIML_H表示所述第二激励信号的高电平值；
    V STIML_L表示所述第二激励信号的低电平值；
    C base1表示所述第一寄生电容的电容值；
    C base2表示所述第二寄生电容的电容值；
    C fb表示所述反馈电容的电容值。
  4. 如权利要求1所述的检测电路，其特征在于，响应于所述传感器电极被触摸，所述传感器电极的等效电容变大，所述输出端的电压变大。
  5. 如权利要求1所述的检测电路，其特征在于，所述传感器电极和所述第一输入端之间串联有第二开关。
  6. 如权利要求1-3中任意一项所述的检测电路，其特征在于，所述第一激励信号和所述第二激励信号为周期相同的同相方波信号。
  7. 如权利要求1所述的检测电路，其特征在于，所述第一输入端为负向输入端，所述第二输入端为正向输入端。
  8. 如权利要求1所述的一种检测电路，其特征在于，所述触控面板包括电容式触控面板。
  9. 一种触控面板，其特征在于，所述触控面板包括电容式触控面板，包括如权利要求1至7中任意一项所述的电路。
  10. 如权利要求9所述的触控面板，其特征在于，所述触控面板的公共 电极被划分得到一个或多个所述传感器电极。
  11. 一种电子设备，其特征在于，包括如权利要求1至8中任意一项所述的电路。
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