WO2018201460A1 - Appareil capacitif de commande tactile, écran capacitif et procédé de commande tactile destiné à un écran capacitif - Google Patents

Appareil capacitif de commande tactile, écran capacitif et procédé de commande tactile destiné à un écran capacitif Download PDF

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Publication number
WO2018201460A1
WO2018201460A1 PCT/CN2017/083262 CN2017083262W WO2018201460A1 WO 2018201460 A1 WO2018201460 A1 WO 2018201460A1 CN 2017083262 W CN2017083262 W CN 2017083262W WO 2018201460 A1 WO2018201460 A1 WO 2018201460A1
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WO
WIPO (PCT)
Prior art keywords
floating
voltage
touch
module
ground
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PCT/CN2017/083262
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English (en)
Chinese (zh)
Inventor
蒋宏
刘丰
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深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2017/083262 priority Critical patent/WO2018201460A1/fr
Priority to CN201780000360.3A priority patent/CN107223230A/zh
Publication of WO2018201460A1 publication Critical patent/WO2018201460A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • 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
    • G06F3/0416—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
    • G06F3/0416—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

Definitions

  • the embodiments of the present invention relate to the field of touch technologies, and in particular, to a touch method of a capacitive touch device, a capacitive screen, and a capacitive screen.
  • the capacitive touch technology has become one of the main means for realizing touch on electronic products.
  • the accuracy of the capacitance detection is also higher and higher.
  • the signal-to-noise ratio is an important factor affecting the accuracy and sensitivity of the capacitance detection.
  • the existing capacitive touch device can improve the signal-to-noise ratio of the capacitive touch device by increasing the driving voltage of the touch chip.
  • the driving voltage is increased, the material of the driving circuit component related to the driving voltage needs to be simultaneously changed to a material suitable for high voltage, and the circuit is more complicated, thereby increasing the complexity and cost of production.
  • An object of the present application is to provide a touch control method for a capacitive touch device, a capacitive screen, and a capacitive screen, which is used to solve at least the above problems in the prior art.
  • the embodiments of the present disclosure provide a capacitive touch device, including: a floating module and a touch module for recognizing a user's touch operation, the grounding end of the touch module a reference ground electrical connection of the touch module; the floating module includes a first switch circuit and a floating output end, the floating output end is electrically connected to the ground end, and the floating module is according to the first switch circuit
  • the on-off state generates a floating signal, and the floating output outputs the floating signal for floating a reference ground electrically connected to the ground with respect to a system ground voltage.
  • the embodiment of the present invention provides a capacitive screen, comprising: the capacitive touch device according to any one of the embodiments of the present application, and a detecting electrode for detecting a touch of the user, the detecting electrode and the capacitive touch
  • the touch modules in the device are electrically connected.
  • the embodiment of the present application provides a touch method of a capacitive screen, including:
  • the floating module generates a floating signal according to an on/off state of the first switch circuit, and the floating output end of the floating module outputs the floating signal;
  • the grounding end of the touch module receives the floating signal, so that a reference ground of the touch module electrically connected to the ground end floats with respect to a voltage of the system ground;
  • the reference ground of the touch module is floating relative to the voltage of the system, so that the detecting electrode connected to the touch module generates an inductive signal
  • the touch module identifies a touch location of the user according to the sensing signal.
  • the touch control method of the capacitive touch device, the capacitive screen and the capacitive screen provided by the embodiment of the present invention realizes the floating connection of the touch module, and the floating connection can enable the reference to receive the high voltage signal, thereby making the system equivalent
  • Receiving a high-voltage driving signal compared with the prior art, in which a high-voltage driving is applied to a driving electrode by a driving circuit, in the prior art, it is necessary to change a material of a driving circuit connected to a plurality of driving electrodes to a high-voltage material, and the present application
  • the present application provides The capacitive touch device can generate the sensing signal by the detecting electrode without using the driving circuit connected to the touch module, and the touch module can recognize the touch position of the user according to the sensing signal, which
  • FIG. 1 is a schematic structural diagram of a capacitor screen according to an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a capacitive touch device according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of voltage changes of a reference ground, a system ground, a ground end, a floating ground output end, a power supply input end, and a power supply output end when the system ground is used as a reference in a capacitive touch device according to an embodiment of the present disclosure;
  • FIG. 4 is a schematic diagram showing voltage changes of a reference ground, a system ground, a ground end, a floating ground output end, a power supply input end, and a power supply output end when the reference ground is used as a reference in a capacitive touch device according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of a capacitive touch model when a finger is touched according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of a capacitive touch device according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of voltage changes of a reference touch, a power supply input end, and a power supply output end with a control signal in a capacitive touch device according to an embodiment of the present disclosure
  • FIG. 8 is a schematic structural diagram of a detection electrode array formed by arranging square detection electrodes according to an embodiment of the present application.
  • FIG. 9( a ) shows the structure of a detection electrode array formed by arranging triangular detection electrodes according to an embodiment of the present application. schematic diagram
  • FIG. 9(b) is a schematic structural diagram of a detecting electrode array formed by arranging another triangular detecting electrode according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a detection electrode array formed by arranging long strip detection electrodes according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a detecting electrode array formed by arranging diamond detecting electrodes according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of an application example of the detecting electrode array provided in FIG. 10 or FIG. 11 according to an embodiment of the present disclosure
  • FIG. 13 is a schematic structural diagram of an application example of the detecting electrode array provided in FIG. 10 or FIG. 11 according to an embodiment of the present disclosure
  • FIG. 14 is a schematic structural diagram of a foldable screen according to an embodiment of the present application.
  • FIG. 15 is a schematic flowchart of a touch method of a capacitive screen according to an embodiment of the present disclosure.
  • the floating module is a floating chip
  • the touch module is a touch chip.
  • the floating module and the touch module may be used.
  • the floating module and the touch module can be integrated into the same chip, or can be combined by multiple chips.
  • the embodiment of the present invention provides a capacitive screen, which includes a capacitive touch device and a detecting electrode for detecting a touch of the user (the detecting electrode is a capacitor 302, a capacitor 301 and a connecting end of the touch chip in FIG. 1 , Not marked in the middle).
  • the capacitive touch device provided by the embodiment of the present invention specifically includes: a touch chip 1 for identifying a touch operation of a user, a floating chip 2, the detecting electrode and the touch chip.
  • the ground connection SGND1 of the touch chip 1 is electrically connected to the reference ground SGND of the touch chip, and the potential of the reference ground is the reference potential of the touch chip.
  • the floating chip 2 includes a first switch circuit 21 and a floating output terminal SGND2, the floating output terminal SGND2 is connected to the ground terminal SGND1, and the floating chip 2 is according to the first
  • the on-off state of the switch circuit generates a floating signal, and the floating output terminal SGND2 outputs the floating signal for making the reference ground SGND connected to the ground terminal SGND1 relative to the system ground GND
  • the potential of the system ground GND can be the reference voltage of the mobile phone provided by the mobile phone power supply, and the potential of the system ground GND can also be the voltage fluctuation of the earth or other reference potential).
  • the floating signal may be a square wave signal, and the square wave signal includes a high level and a low level, and the two levels are alternately output to float the reference ground SGND connected to the ground terminal SGND1 with respect to the system ground GND.
  • the detecting electrode generates an inductive signal according to the voltage fluctuation of the reference ground SGND relative to the system ground GND, so that the touch chip can identify the touch position of the user according to the sensing signal.
  • the touch control chip 1 includes a power supply input terminal SVDD1 , and a voltage difference between the power supply input terminal SVDD1 of the touch control chip 1 and the ground terminal SGND1 is used as an operating voltage of the touch chip 1 . Since the operating voltage of the touch chip 1 is substantially constant to ensure normal operation of the touch chip, when the voltage of the reference ground SGND relative to the system ground GND is floating, the voltage of the power supply input terminal SVDD1 is synchronously floated.
  • the system ground GND voltage can be used as the basic reference voltage, and the system ground GND voltage is assumed to be 0V.
  • the floating output terminal SGND2 of the floating chip 2 When the floating output terminal SGND2 of the floating chip 2 outputs a low level, it can be equal to the system ground GND voltage. When the output level is high level, it can be a constant voltage greater than the system ground GND voltage, such as 7V. Since the output voltage of the floating output terminal SGND2 is either 0v or 7v, the voltage waveform outputted by the floating output terminal SGND2 is a square wave waveform. Since the ground terminal SGND1 of the touch chip 1 is connected to the floating output terminal SGND2, the ground terminal SGND1 is connected to the reference ground SGND.
  • the voltage of the reference ground SGND follows the voltage of the floating output terminal SGND2, for which reference is made.
  • the voltage waveform of the ground SGND is the same as the voltage waveform of the output of the floating output terminal SGND2.
  • the voltage 0v of the reference ground SGND is either 7v, thereby being relative to the system ground GND. 0V floating.
  • the voltage of the power supply input terminal SVDD1 also fluctuates in synchronization. Assume that the operating voltage of the touch chip 1 is 3.3V. As shown in FIG. 3, when the output voltage of the floating output terminal SGND2 is switched to the voltage 0v of the system ground GND, the reference ground SGND is equal to the voltage of the system ground GND.
  • the voltage of the power supply input terminal SVDD1 is 3.3V; when the output voltage of the floating output terminal SGND2 is switched to 7v, the output voltage of the power supply output terminal SVDD2 floats up 7v after switching, and at the same time, The voltage at the power supply input terminal SVDD1 also rises by 7V to 10.3V on the basis of 3.3V.
  • the magnitude of the voltage in this embodiment is only relative.
  • the floating output terminal SGND2, the ground terminal SGND1, the reference ground SGND, the power supply output terminal SVDD2, and the power supply input terminal SVDD1 are all based on the system ground GND, and the floating ground output terminal SGND2 and the ground terminal SGND1 are referenced.
  • the ground SGND, the power supply output terminal SVDD2, and the voltage of the power supply input terminal SVDD1 are actually the difference between the floating output terminal SGND2, the ground terminal SGND1, the reference ground SGND, the power supply output terminal SVDD2, the power supply input terminal SVDD1 and the system ground GND voltage.
  • the system ground GND voltage can be 0v or other values.
  • the capacitor connected to the touch chip may be caused to float according to a reference ground of the touch chip relative to the voltage of the system chip.
  • the detection electrode corresponding to the screen generates an inductive signal.
  • the voltage floating of the reference ground of the touch chip relative to the ground of the system may be equivalent to the voltage floating systematically with respect to the reference ground, and further, when the coupling capacitance is formed between the detecting electrode and the system ground, The voltage floating relative to the reference ground is systematically equivalent to a drive signal.
  • the output voltage of the floating output terminal SGND2 is still switched, so that the reference ground SGND voltage is equal to the system ground GND voltage or equal to 7V, for example, the reference ground is
  • the voltage floating of SGND relative to the system ground GND is converted into a voltage floating of the system ground GND with respect to the reference ground SGND, that is, the system ground GND is used as a reference before the conversion, and the conversion is performed with the reference ground SGND as a reference.
  • the voltages of the rear floating ground output terminal SGND2, the ground terminal SGND1, the system ground GND, the reference ground SGND, the power supply output terminal SVDD2, and the power supply input terminal SVDD1 are actually the difference between their respective voltages from the reference ground SGND.
  • the reference ground SGND voltage is floated up to 7V (at this time, the system ground GND voltage is equal to 0V), and can be converted to the system ground GND voltage equivalent to -7V (the reference ground SGND voltage equivalent is equal to 0V).
  • the converted timing diagram is shown in FIG. 4.
  • the floating output terminal SGND2, the ground terminal SGND1, the reference ground SGND voltage may be a constant voltage of 0V, and the voltage of the power supply input terminal SVDD1 may be a constant voltage of 3.3V.
  • the system ground GND voltage is switched to -7V or 0V, and the voltage waveform of the system ground GND is opposite to the voltage waveform of the reference ground SGND before conversion.
  • the voltage of the reference ground SGND relative to the system ground GND is floating and converted to a voltage floating of the system ground GND with respect to the reference ground SGND, which is equivalent.
  • the voltage waveform output by the variable voltage source is the same as the voltage waveform of the ground GND after the conversion.
  • the output voltage of the variable voltage source is coupled to the sensing electrode to generate an inductive signal, and the detecting electrode is connected to an analog front end (AFE) portion of the touch chip 1 to transmit the sensing signal to the touch chip. 1 in.
  • the detecting electrode After the conversion, the detecting electrode generates an inductive signal according to the voltage fluctuation of the system ground GND with respect to the reference ground SGND, so that the touch chip can identify the touch position of the user according to the sensing signal.
  • the following is a description of the self-capacitance driving. Referring to FIG. 1 and FIG. 5 , when the finger 4 is not touched, a capacitance (Csg) 301 is formed between the detecting electrode 3 and the system ground GND, and the finger 4 is touched. A capacitance (Cfs) 302 is formed between the finger 4 and the detecting electrode 3, and a capacitance (Cfg) 303 is formed between the finger 4 and the system ground GND. The capacitor 302 is connected in series with the capacitor 303.
  • the capacitor 301 and the capacitor 302 The sum of the total capacitance of the capacitor 303 is used as the sensing capacitor; the sensing capacitor changes due to the touch, and the sensing signal generated by the detecting electrode changes, and the touch chip recognizes the sensing signal by sampling, operating, and the like. The user's touch location.
  • the touch chip includes an operational amplifier 101.
  • the grounding end of the operational amplifier 101 is used as the grounding terminal SGND1 to connect with the reference ground SGND, and the forward input terminal of the operational amplifier 101 is connected to a common mode voltage Vcom.
  • the sensing signal is transmitted to the inverting input terminal of the operational amplifier 101, and is output after being processed by the operational amplifier 101.
  • the output end of the operational amplifier 101 is connected to the inverting input terminal of the operational amplifier 101 through the parallel resistor R and the capacitor C to form a negative feedback.
  • the amplifying circuit performs an operational processing on the sensing signal to analyze the sensing signal to identify the touch position of the user. For more details, refer to the related art.
  • the operational amplifier is further provided with a power supply input terminal SVDD1 to form an operating voltage receiving end of the operational amplifier 101 with the grounding terminal SGND1, and in combination with the grounding terminal SGND1 of the touch chip, the power supply input terminal SVDD1 is respectively connected to the floating ground.
  • the floating control can be used to receive the high voltage signal in the reference ground, so that the system is equivalent to receiving the high voltage driving signal, which is required in the prior art compared with the prior art in which the driving circuit is applied with high voltage to the driving electrode.
  • the material of the driving circuit connected to the plurality of driving electrodes is changed to a high voltage material, and the present application receives the high voltage signal through a reference ground, and only needs to change the material of the reference ground to a high voltage material, thereby reducing the high voltage material. Use, which reduces production costs.
  • the capacitive touch device can generate a sensing signal by the detecting electrode without using a driving circuit connected to the touch chip, so that the touch chip can recognize the touch position of the user according to the sensing signal. It reduces the complexity of the capacitive touch device and further reduces production costs.
  • the operating voltage of the touch chip is provided through the grounding terminal SGND1 and the power supply input terminal SVDD1, the operating voltage is normally constant. Therefore, in this embodiment, the power supply input terminal SVDD1 is electrically connected.
  • a voltage stabilizing unit 5 (such as the stabilizing capacitor 5 shown in FIG. 2) for maintaining a constant voltage difference between the ground terminal and the power supply input terminal.
  • the power supply output end of the floating chip is electrically connected to the power supply input end of the touch chip, and the power supply output end of the floating module and the power supply input end of the touch module are both connected to the voltage regulation
  • the unit is electrically connected to maintain a constant voltage difference between the power supply output end and the floating output end, thereby maintaining a constant pressure difference between the ground terminal and the power supply input terminal. Since the voltage difference across the voltage stabilizing unit 5 cannot be abruptly changed, when the output voltage of the floating output terminal SGND2 is switched to a low level or a high level, the output voltage of the power supply output terminal SVDD2 follows the floating output.
  • the output voltage of the terminal SGND2 is synchronously floated, so that the input voltage of the power supply input terminal SVDD1 follows the output voltage of the power supply output terminal SVDD2, that is, the voltage difference between the ground terminal SGND1 and the power supply input terminal SVDD1. Constant to provide a stable operating voltage.
  • the power supply 6 connected to the GND of the negative electrode and the ground of the system and the power supply input terminal SVDD1 is used to supply power to the touch chip.
  • the ground terminal SGND1 is also connected to the system ground GND, and the ground terminal SGND1 is opposite to the system. Ground GND does not float, resulting in the need for a voltage regulator unit.
  • the ground terminal SGND1 is connected to the reference ground SGND, and then the output voltage of the floating output terminal SGND2 is floated by the control of the floating chip 2, and the reference ground SGND is floated relative to the system ground GND.
  • the presence of the voltage stabilizing unit can keep the voltage difference between the ground terminal SGND1 and the power supply input terminal SVDD1 constant before and after the reference ground SGND floats relative to the system ground GND, thereby providing a stable operating voltage for the touch chip.
  • the floating control signal input terminal Tx2 of the floating chip is electrically connected to the touch chip to control the on/off state of the first switch circuit according to the floating control signal output by the touch chip, thereby controlling the The floating signal outputted by the floating output terminal.
  • the touch chip 1 may include a floating control terminal 102 for generating a floating control signal, and the floating control signal is transmitted to the floating chip 2 through the floating control signal input terminal Tx2 to control
  • the on/off state of the first switch circuit further controls the output of the first switch circuit to switch to a low level or a high level, thereby controlling a floating signal outputted by the floating output terminal, and at the same time, controlling the power supply output terminal SVDD2
  • the output voltage follows the output voltage of the floating output terminal SGND2 to float synchronously.
  • the touch chip 1 is provided with a floating control signal output terminal Tx1, and the floating control terminal 102 can be a digital-to-analog converter integrated in the touch chip 1 , and the floating mode control of the digital-to-analog converter and the touch chip 1
  • the signal output terminal Tx1 is connected, and the touch chip 1 can be converted into a floating control signal by a digital-to-analog converter, and then outputted through the floating control signal output terminal Tx1.
  • the floating control signal input terminal Tx2 of the floating chip 2 is electrically connected to the floating control signal output terminal Tx1 to receive the control signal.
  • the first switch circuit includes a first switch 211, a second switch 212 that can be connected in parallel, and a third connection between the power supply output end of the floating chip and the power supply of the floating chip.
  • the ground chip maintains a constant voltage difference between the power supply output end of the floating chip and the floating output end of the floating chip according to the on/off state of the third switch, and the following exemplary generation generates a floating signal and floats
  • the voltage switching at the ground output terminal SGND2 is explained.
  • the floating control signal controls the first switch 211 to be closed and the second switch 212 to be turned off, so that the output level of the first switching circuit becomes the low level received by the first switch 211, and at this time, the floating output terminal Switch the output of SGND2 to Low level, while the third switch 213 is closed.
  • the output voltage of the floating output terminal SGND2 is the voltage of the system ground GND
  • the voltage of the power supply output terminal SVDD2 can be connected to the power supply 6 connected to the floating chip power supply terminal AVDD.
  • the floating control signal controls the first switch 211 to be turned off and the second switch 212 to be closed, such that the output level of the first switching circuit is a high level received by the second switch 212, and at this time, the floating output
  • the output of the terminal SGND2 is switched to the high level, and the third switch 213 is turned off, and the power supply output terminal SVDD2 stops charging for the voltage stabilizing capacitor, and further can be characterized according to the characteristic that the voltage difference between the two ends of the voltage stabilizing capacitor cannot be abrupt, at the floating output terminal SGND2
  • the level of the power supply output terminal SVDD2 is simultaneously pulled up, so that the output voltage of the power supply output terminal SVDD2 follows the output voltage of the floating output terminal SGND2 to float synchronously.
  • the floating output terminal may be electrically connected to a boosting circuit, and the boosting circuit is configured to perform boost processing on the operating voltage of the floating chip. .
  • the voltage value is further increased after the boosting process, and the signal-to-noise ratio of the capacitive touch device is improved by increasing the driving voltage, so that the capacitive touch device provided by the embodiment can be identified.
  • the hovering touch can also be called proximity sensing or air-spaced touch.
  • the finger When the touch is hovering, the finger does not touch the touch screen but hangs over the touch screen, and has a certain distance from the touch screen, and the finger suspension causes The position of the finger and the detecting electrode is far away, which in turn causes the capacitor 302 to be small, so that the variation of the sensing capacitance is small.
  • the boosting circuit may be a boost boosting circuit, including: a first energy storage unit (such as the inductor 221), a second switching circuit (such as the diode 222 and the fourth switch 224), and a second An energy storage unit (such as the storage capacitor 223), the first energy storage unit is electrically connected to the second energy storage unit through the second switch circuit, and the power supply of the floating chip is according to the second switch circuit
  • the on-off state charges the second energy storage unit, or the first energy storage unit charges the second energy storage unit according to an on-off state of the second switch circuit.
  • the terminal voltage of the second energy storage unit when the second energy storage unit is charged by the power supply of the floating chip, the terminal voltage of the second energy storage unit may be equal to the power supply voltage of the floating chip, and the first energy storage unit is the first When the two energy storage units are charged, the terminal voltage of the second energy storage unit may be greater than the power supply voltage of the floating chip to implement a voltage boosting process on the operating voltage of the floating chip.
  • the diode 222 and the fourth switch 224 as the second switching circuit can be integrated into the floating chip 2, and externally stored by the Boost switch input terminal BST_SW (Boost switch) on the floating chip 2 and the high voltage output terminal HV.
  • Capacitor 223 and inductor 221 constitute a booster circuit.
  • the specific connection method is as follows:
  • One end of the inductor 221 is connected to the positive pole of the power supply 6 and the other end is connected through the Boost switch input BST_SW Connected to the anode of the diode 222, the cathode of the diode 222 is connected to one end of the storage capacitor 223 through a high voltage output terminal HV, and the other end of the storage capacitor 223 is grounded, inside the floating chip 2,
  • One end of the fourth switch 224 is connected between the inductor 221 and the anode of the diode 222, and the other end is grounded, so that the Boost switch input terminal BST_SW can be grounded through the fourth switch 224.
  • the voltage of the Boost switch input terminal BST_SW is variable.
  • the positive voltage of the diode 222 is greater than the negative voltage, the diode 222 is forward-conducting, and the power supply 6 is the storage capacitor 223.
  • the voltage charged to the storage capacitor 223 is the same as the power supply voltage; the fourth switch 224 is closed.
  • the voltage of the Boost switch input terminal BST_SW is the same as the system ground GND voltage, and the positive voltage of the diode 222 is systematically The GND voltage, the negative voltage of the diode 222 is the same as the voltage of the storage capacitor 223, and the positive voltage is lower than the negative voltage, so that the diode 222 is reversely turned off.
  • the diode 222 no longer has a current, so that the storage capacitor 223 cannot be discharged.
  • the power supply voltage is greater than the boost input switch BST_SW voltage, so that the power supply 6 charges the inductor 221 to increase the current of the inductor 221; the fourth switch 224 is turned off, because the inductor current is greater than 0, and the inductor current cannot.
  • the mutation causes the positive voltage of the diode 222 to be greater than the negative voltage, the diode 222 is turned on, the inductor 221 continues to discharge, and the inductor current is reduced, so that the energy storage is Capacitor 223 is charged, after recharging, the terminal voltage of the storage capacitor 223 is greater than the power supply voltage, which can be used as the output terminal of the booster circuit to output a high level, and the high level can directly pass through the internal circuit of the floating chip 2 and the floating output.
  • the circuit connected to the terminal SGND2 provides a high level for the floating output terminal SGND2, and
  • the fourth switch 224 can refer to FIG. 6 as a first NMOS transistor, the gate of the first NMOS transistor is connected to the boost signal Ctrl, the source is connected to the system ground GND, and the drain is connected to the Boost switch input terminal BST_SW.
  • the boost signal Ctrl can be a square wave signal, and the on-off state of the first NMOS transistor is controlled by a square wave signal whose voltage value is constantly changing, thereby charging the storage capacitor 223, and further controlling the frequency of the boost signal Ctrl and The duty cycle controls the charging frequency of the storage capacitor 223 and the amount of charge that the inductor 221 charges the storage capacitor 223 to produce a sustained, stable high level.
  • the first switch 211 may be a second NMOS transistor, the source of the second NMOS transistor is connected to the system ground GND, the drain is connected to the floating output terminal SGND2, and the gate of the second NMOS transistor is passed through the inverter 214.
  • the floating control signal input terminal Tx2 is connected to control the on and off of the second transistor through the inverted square wave signal;
  • the second switch 212 may be the third NMOS transistor, the source of the third NMOS transistor and the floating output terminal SGND2
  • the connection and the drain are connected to the output end of the boosting circuit, and the gate of the third transistor is directly connected to the floating control signal input terminal Tx2 to directly control the on and off of the third NMOS transistor through the square wave signal;
  • the third switch 213 can For the first PMOS transistor, the source of the first PMOS transistor is connected to the power supply output terminal SVDD2, and the drain is connected to the power supply source 6 of the floating chip 2, and the gate is directly
  • the floating control signal input terminal Tx2 is connected to control the on and off of the first PMOS transistor through the square wave signal.
  • FIG. 6 is a schematic structural diagram of a capacitive touch device according to an embodiment of the present disclosure.
  • the boosting circuit further includes voltage adjustment.
  • the voltage adjustment unit 225 is configured to control an on/off state of the second switch circuit, and further adjust an output voltage of the boost circuit to adjust a high level of a high level outputted by the floating output terminal SGND2.
  • the reference ground SGND is adjusted with respect to the floating voltage of the system ground GND. By adjusting the level of the voltage floating, the driving voltage applied to the grounding end of the sensing capacitor can be adjusted to adjust the signal-to-noise ratio and capacitance of the capacitive touch device. The actual use of the control device matches.
  • the voltage adjusting unit 225 includes: a first voltage dividing resistor R1 and a second voltage dividing resistor R2, and the first voltage dividing resistor R1 is connected in series with the second voltage dividing resistor R2. Integrating with the second energy storage unit (such as the storage capacitor 223) in parallel to control the on/off state of the second switch circuit according to the voltage of the second energy storage unit, thereby adjusting the boost circuit The output voltage.
  • the second energy storage unit such as the storage capacitor 223
  • the voltage of the second energy storage unit needs to be divided by two voltage dividing resistors, according to the partial pressure
  • the voltage controls an on-off state of the second switching circuit, thereby adjusting an output voltage of the boosting circuit.
  • the on/off state of the second switch circuit may be determined according to a comparison result between the voltage after the voltage division and the threshold voltage, thereby controlling the first energy storage unit to start or stop as the first
  • the second energy storage unit is charged to form a closed loop feedback circuit.
  • the output voltage of the booster circuit can be adjusted by adjusting the voltage dividing ratio of the first voltage dividing resistor and the second voltage dividing resistor and/or the threshold voltage.
  • the threshold voltage may be a fixed reference voltage VFB (Voltage Feed Back), and the divided voltage output voltage and the fixed reference voltage VFB are compared.
  • VFB Voltage Feed Back
  • the boost controller changes the boost signal Ctrl to close the fourth switch 224, so that the inductor 224 stops charging the storage capacitor 223, and the voltage value of the voltage of the storage capacitor 223 stops rising.
  • the output voltage of the booster circuit can be adjusted by adjusting the voltage dividing ratio of the voltage dividing resistor and / or the fixed reference voltage VFB.
  • the voltage adjustment range can be 7-15V.
  • the boosting circuit is described by taking a boosting process on a power supply voltage as an example.
  • the voltage output by the boosting circuit may be 7V, 9V, 15V, or the like. The specific can be determined according to actual needs.
  • the boosting circuit is mainly for achieving an increase in the voltage value of the reference ground SGND, and in other alternative embodiments, the boosting circuit may also be an unnecessary component, in which case the reference The ground SGND can still float relative to the voltage of the system ground GND.
  • the detecting electrodes 3 may be disposed in a certain order, and the detecting electrodes 3 generally include a square detecting electrode, a triangular detecting electrode, a diamond detecting electrode, and the like.
  • FIG. 8 is a schematic structural diagram of a detection electrode array formed by arranging square detection electrodes according to an embodiment of the present invention.
  • the detection electrodes 801 are arranged in a lattice form to form a dot pattern, and each detection electrode 801 is led out.
  • Root wire 802. When the finger is touched, the position of the detecting electrode of the finger touch can be determined by scanning each of the wires 802 to obtain the sensing signal on the finger; since the detecting electrode is relatively independent, the touch of each finger is touched during the touch.
  • the signals generated by the points are relatively independent, and thus the positions of the plurality of touch points can be determined by the plurality of sensing signals to realize multi-finger touch.
  • FIG. 9(a) is a schematic structural diagram of a detection electrode array formed by arranging triangular detection electrodes according to an embodiment of the present invention.
  • a triangular-shaped detection electrode 901 is placed along a diagonal of a rectangle.
  • the detection electrodes 901 are placed in a diagonal direction, and each of the detection electrodes 901 leads to a wire 902.
  • the touch points of the finger touch are different in the capacitance, resulting in the touch sensing.
  • the amount of change of the capacitance is different, and then the sensing signal is obtained by scanning each of the wires 902, and the changing sensing capacitance is determined by the sensing signal to determine the position of the finger touch.
  • the arrangement of the detecting electrodes is performed by the detecting electrode arrangement provided in this embodiment, and the two-finger touch on different columns can be sensed.
  • FIG. 9(b) is a schematic structural diagram of a detection electrode array formed by arranging another triangular detection electrode according to an embodiment of the present application.
  • the detection electrode array is divided into 903 in FIG. 9(b).
  • the regions 903 and 904 respectively include all the detecting electrodes in FIG. 9( a ), so that the sensing electrodes are divided into two groups, and each of the detecting electrodes is electrically connected to the touch chip through different channels, and further
  • the two-finger touch on different columns can be sensed to further realize two-finger touch on the same column, and the positions of the two-finger touch are respectively located in the region 903 and the region 904 .
  • FIG. 10 is a schematic structural diagram of a detecting electrode array formed by arranging long strip detecting electrodes according to an embodiment of the present invention, wherein the strip detecting electrode is a type of square detecting electrode, as shown in FIG. 10, the detecting electrode is divided into For the lateral electrode 1001 and the longitudinal electrode 1002, a double pattern is formed after alignment, and each of the detecting electrodes leads a wire.
  • the wire drawn by the scanning lateral electrode 1001 determines the ordinate of the touch point when the finger is touched, and scans the longitudinal electrode.
  • the lead wire drawn by the 1002 determines the abscissa of the touch point when the finger touches, thereby determining a touch point, but the detection electrode array provided in this embodiment can only recognize single-finger touch and multi-finger zoom, in multi-touch Control time will form a ghost point.
  • the detection electrode array can be divided into regions 1201 and 1202, wherein the regions 1201 and 1202 respectively include all the detection electrodes in FIG. 10, thereby dividing the sensing electrodes into two groups, each group of the detection electrodes.
  • the two-finger touch is further realized on the basis of the single-finger touch and the multi-finger zoom in FIG. 10, and the positions of the two fingers are located in 1201 and 1202, respectively.
  • the screen can be divided into four areas to implement four-finger touch.
  • the touch principle is the same as that of FIG. 12 , and details are not described herein again.
  • FIG. 11 is a schematic structural diagram of a detection electrode array formed by arranging diamond detection electrodes according to an embodiment of the present invention.
  • the detection electrodes are divided into a lateral electrode 1101 and a longitudinal electrode 1102, and the lateral electrode 1101 and the longitudinal electrode 1102 are both A plurality of diamond-shaped blocks are connected, and each of the lateral electrodes 1101 and the longitudinal electrodes 1102 leads a wire.
  • the ordinate is determined by scanning the wire drawn from the lateral electrode 1101, and the abscissa is determined by scanning the wire drawn from the longitudinal electrode 1102.
  • the detection electrode array provided in this embodiment can only recognize single-finger touch or two-finger zoom.
  • the detection electrode array can be divided into regions 1201 and 1202, wherein the regions 1201 and 1202 respectively include all the detection electrodes in FIG. 11, thereby dividing the sensing electrodes into two groups, each group of the detection electrodes.
  • the two-finger touch is further realized on the basis of the single-finger touch or the two-finger zoom, and the positions of the two fingers are respectively located in 1201 and 1202.
  • the screen can be divided into four areas to implement four-finger touch.
  • the touch principle is the same as that of FIG. 12 , and details are not described herein again.
  • the capacitive touch device provided by the present invention is only an example of the present application, and is not limited by the present application.
  • the capacitive touch device provided by the present application can also be applied to the self-capacitance and mutual capacitance. This embodiment will not be described in detail herein.
  • a capacitive screen which may be any of a flexible screen and a foldable screen.
  • the foldable screen 14 includes a first foldable surface 1401. And a second foldable surface 1402, the first foldable surface 1401 and the second foldable surface 1402 are rotatable about the central axis 1403.
  • the embodiment of the present application provides a touch method of a capacitive screen, as shown in FIG. 15 , which includes:
  • the embodiment provides a touch screen of a capacitive screen.
  • the detecting electrode can be disposed under the capacitive screen, and the area covered by the detecting electrode can be equal to the area of the capacitive screen, and the detecting electrode and the capacitor are
  • the touch module is electrically connected to the touch module, the ground end of the touch module is electrically connected to the reference ground of the touch module, and the floating module includes a first switch circuit and a floating output end, and the output of the first switch circuit
  • the terminal is connected to the floating output end, and the floating output end is electrically connected to the ground end of the touch module.
  • the touch screen of the capacitive screen includes:
  • the floating module generates a floating signal according to an on/off state of the first switch circuit, and the floating output end of the floating module outputs the floating signal;
  • the on/off state of the first switch circuit may be controlled according to the floating control signal output by the touch module, and then the floating signal output by the floating output terminal may be controlled.
  • the method further includes: performing a step-up process on the operating voltage of the floating module to generate the floating signal according to the voltage after the boosting process.
  • the grounding end of the touch module receives the floating signal, so that a reference ground of the touch module electrically connected to the ground end floats with respect to a voltage of the system ground;
  • the voltage of the power supply input end of the touch module is synchronously floating, and the power input terminal and the ground terminal are The voltage difference between the two is used as the operating voltage of the touch module.
  • the reference ground of the touch module is floating relative to the voltage of the system ground, so that the detecting electrode connected to the touch module generates an induction signal.
  • the voltage floating of the reference ground of the touch module relative to the ground of the system may be equivalent to a voltage floating systematically with respect to the reference ground, and thus, when the coupling capacitance is formed between the detecting electrode and the system ground, the system may be relatively
  • the voltage at the reference ground is systematically equivalent to a driving signal, and the driving signal can drive the system to ground, and the sensing signal generated on the detecting electrode corresponding to the capacitive screen connected to the touch module is coupled through the coupling capacitor.
  • the touch module identifies a touch position of the user according to the sensing signal.
  • the touch module when the reference ground of the touch module is floating relative to the voltage of the system ground, the touch module receives a signal corresponding to the detecting electrode, to identify the user according to the sensing signal. Touch location;
  • the touch control module communicates with the main control module when the reference ground of the touch module is not floating with respect to the voltage of the system ground, and the main control module is a main control module of the electronic device where the touch module is located.
  • the output voltage of the floating output terminal is controlled to be switched to a low level (for example, 0 V) or a high level (for example, 15 V) by an output control signal through the floating control terminal as an example.
  • the control signal can be divided into a driving phase and a communication phase.
  • the driving phase of the control signal at this time, the reference ground of the touch module is relative to the voltage of the system ground.
  • the touch module receives the detection signal generated by the detecting electrode to identify the touch position of the user according to the sensing signal.
  • the control signal is a square wave signal, and the voltage value of the square wave signal is continuously changed.
  • the square wave signal voltage value is constant to control the output voltage of the floating output terminal to be low level (for example, 0 V).
  • the touch module communicates with the main control module (for example, when the level of the “communication” signal shown in FIG. 7 is high level, the touch module communicates with the main control module), and the main control module is the electronic device where the touch module is located.
  • the main control module of the device for example, when the level of the “communication” signal shown in FIG. 7 is high level, the touch module communicates with the main control module
  • the output voltage of the floating output terminal of the floating module may not be equal to the system ground voltage, and at this time, a level conversion device for converting the communication level between the touch module and the communication port of the main control module is added.
  • the conversion level between the touch module and the main control module can be converted; or those skilled in the art can add other circuits or components to the circuit to ensure the touch module and the main control module according to the inspiration of the embodiment. Normal communication is not described in this embodiment.
  • the floating control can be used to receive the high voltage signal in the reference ground, so that the system is equivalent to receiving the high voltage driving signal, which is required in the prior art compared with the prior art in which the driving circuit is applied with high voltage to the driving electrode.
  • the material of the driving circuit connected to the plurality of driving electrodes is changed to a high voltage material, and the present application receives the high voltage signal through a reference ground, and only needs to change the material of the reference ground to a high voltage material, thereby reducing the high voltage material. Use, thereby reducing the production cost.
  • the capacitive touch device provided by the present application can generate a sensing signal by the detecting electrode without using a driving circuit connected to the touch module, so that the touch chip can identify the sensing chip according to the sensing signal.
  • the user's touch position reduces the complexity of the capacitive touch device and further reduces production costs.
  • embodiments of the present application can be provided as a method, apparatus (device), or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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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)
  • Position Input By Displaying (AREA)
  • Electronic Switches (AREA)

Abstract

La présente invention concerne un appareil de commande tactile capacitif, un écran capacitif et un procédé de commande tactile destiné à un écran capacitif, l'appareil capacitif de commande tactile comprenant : un module flottant (2) et un module de commande tactile (1) utilisé pour reconnaître une opération de commande tactile d'utilisateur, une borne de masse (SGND1) du module de commande tactile (1) étant en communication électrique avec une masse de référence (SGND) du module de commande tactile (1); le module flottant (2) comprend un premier circuit de commutation (21) et une borne de sortie flottante (SGND2), la borne de sortie flottante (SGND2) étant en communication électrique avec la borne de masse (SGND1), le module flottant (2) générant un signal flottant sur la base de l'état de conduction du premier circuit de commutation (21), la borne de sortie flottante (SGND2) émettant le signal flottant, et le signal flottant étant utilisé pour rendre la masse de référence (SGND) en communication électrique avec la borne de masse (SGND1) flottante par rapport à la tension d'une masse du système (GND), l'appareil capacitif de commande tactile recevant un signal haute tension au moyen d'une masse de référence (SGND), ayant seulement besoin d'utiliser un matériau à haute tension pour la masse de référence (SGND), et n'ayant pas besoin de détecter un signal d'induction d'électrodes au moyen d'un circuit d'attaque, de telle sorte qu'une puce de commande tactile (1) puisse reconnaître la position tactile de l'utilisateur sur la base du signal d'induction, ce qui permet de réduire la complexité de l'appareil de commande tactile capacitif et de réduire les coûts de production.
PCT/CN2017/083262 2017-05-05 2017-05-05 Appareil capacitif de commande tactile, écran capacitif et procédé de commande tactile destiné à un écran capacitif WO2018201460A1 (fr)

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CN201780000360.3A CN107223230A (zh) 2017-05-05 2017-05-05 电容触控装置、电容屏及电容屏的触控方法

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CN108664955B (zh) * 2018-06-14 2024-01-12 上海思立微电子科技有限公司 指纹识别装置
WO2020103128A1 (fr) * 2018-11-23 2020-05-28 深圳市柔宇科技有限公司 Panneau tactile, son procédé de commande, et dispositif tactile
CN112782673A (zh) * 2019-11-07 2021-05-11 上海禾赛科技股份有限公司 故障诊断方法、激光雷达发射端组件及激光雷达
CN113983223B (zh) * 2020-07-27 2023-07-21 云米互联科技(广东)有限公司 触摸式水龙头
CN112799531B (zh) * 2021-01-04 2023-11-17 厦门天马微电子有限公司 一种显示装置及其驱动方法
CN112799551B (zh) * 2021-01-20 2024-03-15 京东方科技集团股份有限公司 一种触控模组及其定位检测方法、触控面板

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