WO2021088083A1 - 触控检测方法、触控检测电路、触控芯片以及电子设备 - Google Patents

触控检测方法、触控检测电路、触控芯片以及电子设备 Download PDF

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Publication number
WO2021088083A1
WO2021088083A1 PCT/CN2019/116883 CN2019116883W WO2021088083A1 WO 2021088083 A1 WO2021088083 A1 WO 2021088083A1 CN 2019116883 W CN2019116883 W CN 2019116883W WO 2021088083 A1 WO2021088083 A1 WO 2021088083A1
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WIPO (PCT)
Prior art keywords
signal
touch
frequency
real
display panel
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PCT/CN2019/116883
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English (en)
French (fr)
Inventor
蒋宏
李国炮
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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/CN2019/116883 priority Critical patent/WO2021088083A1/zh
Priority to CN201980002773.4A priority patent/CN113168268B/zh
Publication of WO2021088083A1 publication Critical patent/WO2021088083A1/zh
Priority to US17/460,582 priority patent/US11755148B2/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
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • 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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
    • H03L2207/10—Indirect frequency synthesis using a frequency multiplier in the phase-locked loop or in the reference signal path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop

Definitions

  • the embodiments of the present application relate to the field of touch technology, and in particular, to a touch detection method, a touch detection circuit, a touch chip, and an electronic device.
  • the driving signal of the display usually causes interference to the sensing line of the touch sensor, and the resulting interference will vary with the change of the display screen, and this interference signal can sometimes be very large.
  • the current touch control chip faces the noise signal interference and the strong driving noise signal interference of the display in the working environment, there is a problem of low touch sensitivity.
  • embodiments of the present application provide a touch detection method, a touch detection circuit, a touch chip, and an electronic device to overcome or alleviate the touch detection interference signal and the touch chip driven by the display in the prior art.
  • the embodiment of the application provides a touch detection method, which includes: receiving a real-time synchronization signal sent by a touch display panel; acquiring the frequency of a noise signal in the working environment of the touch chip; and setting the code driving signal according to the frequency of the noise signal Frequency: Generate a coding drive signal according to the frequency of the coding drive signal, and output the coding drive signal to the drive electrode of the touch display panel; generate a strobe signal according to the real-time synchronization signal; receive the sensing electrode of the touch display panel The signal; according to the strobe signal and the signal of the sensing electrode, the detection result is output.
  • the embodiment of the application provides a touch detection circuit, including: a synchronization signal controller, which is used to receive a real-time synchronization signal sent by a touch display panel and obtain the frequency of a noise signal in the working environment of the touch chip; a coding signal generator , For setting the frequency of the coding driving signal according to the frequency of the noise signal, generating a coding driving signal according to the frequency of the coding driving signal, and outputting the coding driving signal to the touch display
  • the driving electrode of the panel a signal detection strobe for generating a strobe signal according to the real-time synchronization signal, and receiving the signal of the sensing electrode of the touch display panel, according to the strobe signal and the sensing electrode Signal, output the test result.
  • the embodiment of the present application provides a touch control chip, which includes the touch detection circuit in any embodiment of the present application.
  • An embodiment of the present application provides an electronic device, which includes a touch chip and a touch display panel.
  • the touch chip includes the touch detection circuit in any embodiment of the present application and a second PLL frequency multiplying circuit.
  • the touch display The panel includes the first PLL frequency multiplication circuit.
  • the real-time synchronization signal sent by the touch display panel is received; the frequency of the noise signal in the working environment of the touch chip is obtained; and the frequency of the coding drive signal is set according to the frequency of the noise signal.
  • Frequency generating a coding driving signal according to the frequency of the coding driving signal, and outputting the coding driving signal to the driving electrodes of the touch display panel; generating a strobe signal according to the real-time synchronization signal; receiving the touch Control the signal of the sensing electrode of the display panel, and output the detection result according to the strobe signal and the signal of the sensing electrode.
  • the sensing electrode can not only detect a large effective signal amount, but also obtain the working environment of the touch chip.
  • the frequency of the noise signal Set the frequency of the coding drive signal to minimize the influence of noise on the received signal.
  • FIG. 1 is a schematic structural diagram of a touch system in an embodiment of the application
  • FIG. 2 is a flowchart of a touch detection method in an embodiment of the application
  • FIG. 3a is a circuit diagram of a touch detection circuit in an embodiment of the application.
  • FIG. 3b is a schematic diagram of a structure of a touch display panel in an embodiment of the application.
  • FIG. 4 is a partial flowchart of a touch detection method in an embodiment of the application.
  • FIG. 5 is a schematic diagram showing the time sequence of the association relationship of the same-frequency signals in an embodiment of the application
  • FIG. 6 is a flowchart of a touch detection method of a touch display panel in another embodiment of the application.
  • FIG. 7 is a flowchart of a touch detection method of a touch display panel in another embodiment of the application.
  • FIG. 8 is a schematic structural diagram of a synchronization signal controller of a touch detection circuit in another embodiment
  • FIG. 9 is a schematic diagram of a time sequence showing the association relationship of frequency hopping signals in an embodiment of the application.
  • FIG. 10 is a circuit diagram of a touch detection circuit in another embodiment of the application.
  • FIG. 11a is a schematic structural diagram of a common source clock for the touch display panel and the touch chip in an embodiment of the application;
  • FIG. 11b is a schematic structural diagram of a shared source clock between the touch display panel and the touch chip in another embodiment of the application;
  • FIG. 11c is a schematic structural diagram of a shared source clock between the touch display panel and the touch chip in another embodiment of the application.
  • Fig. 12 is a noise distribution diagram obtained by a noise detection module in an embodiment of the application.
  • the touch system includes a touch display panel, a touch chip 12 and a host 13, and the touch display panel includes a touch sensor 11 and a display panel 14.
  • the touch sensor 11 has a two-layer structure.
  • the driving layer is called a Tx layer and the sensing layer is called an Rx layer.
  • the driving layer includes a plurality of driving electrodes Tx1, Tx2, Tx3, etc.
  • the sensing layer includes a plurality of sensing electrodes Rx1, Rx2, etc. Rx3, etc., below the driving layer and the sensing layer is the display panel 14.
  • the driving interference signal of the display panel 14 will affect the sensing accuracy of the driving layer and the sensing layer, especially for the display panel of Y-OCTA technology, because this technology combines the touch sensor 11 and the display panel 14 at one time.
  • the display panel 14 is closer to the driving layer and the sensing layer, and the influence of the display panel 14 on the sensing accuracy of the driving layer and the sensing layer is also greatly increased, resulting in a more significant decrease in touch sensitivity.
  • the embodiment of the present application detects the touch sensor signal during the period when the display driving noise is avoided, and sets the frequency of the coding driving signal according to the change of the noise signal in the working environment of the touch chip, which greatly avoids the operation of the touch chip.
  • the influence of noise signals in the environment and the influence of display driving noise signals enable the touch chip to not only detect a larger effective signal amount, but also improve the signal-to-noise ratio of the final detected effective signal, and greatly increase the touch sensitivity.
  • FIG. 2 is a flowchart of a touch detection method for a touch display panel according to an embodiment of the application.
  • the method includes:
  • the touch display panel 31 of the embodiment of the present application includes a touch sensor 311, a display panel 312, and a display driving chip 313.
  • the display driving chip 313 sends a real-time synchronization signal to the touch chip 32, the display driving chip 313 is connected to the display panel 312, and the display panel 312 is coupled to the touch control sensor 311.
  • the touch chip 32 includes a synchronization signal controller 321, a coding signal generator 322 and a signal detection gate 323.
  • the synchronization signal controller 321 receives the real-time synchronization signal sent by the display driving chip 313 in the touch display panel 31.
  • the real-time synchronization signal includes: a line real-time synchronization signal (Hsync) that is correlated with a noise signal and a field real-time synchronization signal (Vsync) that controls the refresh rate.
  • Hsync line real-time synchronization signal
  • Vsync field real-time synchronization signal
  • the real-time synchronization signal (sync) of this application adopts the horizontal real-time synchronization signal (Hsync).
  • a trigger signal is generated during the period of avoiding display driving noise, and the trigger signal can trigger the system operation during the period of avoiding display driving noise.
  • the touch chip cooperates with the touch screen to complete the touch operation
  • the working environment of the touch chip contains large noise, such as the LCD noise of the touch screen, and the frequency of this noise is equal to the frequency of the code driving signal, then It will affect the normal operation of the touch chip.
  • the touch chip cannot accurately calculate the touch coordinates or there are many errors in the calculation of the touch coordinates. Therefore, the noise signal in the working environment of the touch control chip can be detected first to avoid those high-noise frequency points, and the low-noise frequency is selected as the frequency of the coding drive signal.
  • step S2 includes:
  • S22 Detect the intensity of the noise signal of each frequency in the working environment of the touch control chip, and set the frequency of the noise signal that is lower than the preset intensity threshold in the intensity of the detected noise signal as the frequency of the coding drive signal.
  • FIG. 12 is a noise distribution diagram obtained by the noise detection module in some embodiments of the present application.
  • the noise information in the working environment of the touch chip is detected to obtain the noise signal.
  • the touch control chip detects that there are large noise signals at the frequency points f1, f2, fi, fk+1, and fn, which need to be avoided.
  • the noise signal at the frequency point fk is relatively small, so the frequency point fk can be used as the frequency of the coding drive signal.
  • the intensity of the noise signal detected at each frequency in the working environment of the touch chip can be compared with a preset intensity threshold.
  • selecting the frequency point with the smallest noise as the frequency of the coding signal output by the coding signal generator can be realized by a comparison function. Assuming that the set of frequency points in the working environment of the touch chip is ⁇ f1, f2,...fi,...fn ⁇ , set the noise intensity at the frequency points of f1, f2,...fi,...fn to be P(f1), P(f2) ),...P(fi), P(fn), and set a variable Min.
  • Min P(f1)
  • Min When Min is greater than any of P(fk), set Min equal to this P(fk). Then compare the modified Min with the remaining noise intensity until the end of the comparison with P(fn). At this time, the frequency corresponding to Min is the frequency with the smallest noise, and the frequency of the noise signal is set as the frequency of the coding signal generator outputting the coding driving signal.
  • the frequency of the minimum noise as the frequency of the coding signal generator 322 outputting the coding driving signal, the influence of noise in the working environment of the touch chip on touch detection is further reduced, and the touch coordinate calculation of the touch chip is improved. The accuracy of the information.
  • noise intensity in any of the above embodiments can be to convert noise into a corresponding electrical signal, and use some parameters of the noise electrical signal as the quantity to characterize the noise intensity, such as voltage, energy, Variance or power, etc.
  • the coding signal generator 322 outputs the coding driving signal at different frequencies and switching the operating frequency is achieved by frequency hopping, and there are many ways of frequency hopping.
  • fi is the frequency at which the coding signal generator 322 outputs the coding driving signal for the i-th time.
  • fi+1 is the frequency at which the coding signal generator 322 outputs the coding driving signal for the i+1th time.
  • the frequency hopping algorithm function which specifies the rule to jump from fi to fi+1.
  • the touch detection method further includes:
  • the real-time synchronization signal (sync) of this application adopts the horizontal real-time synchronization signal (Hsync).
  • This application determines the trigger time point of the trigger signal by displaying the relationship between the noise signal caused by the driving operation and the horizontal real-time synchronization signal (Hsync).
  • the correlation is not limited to the fixed and concentrated edge position of the noise signal (Display Noise) relative to the horizontal real-time synchronization signal (Hsync), but also includes other correlations of the noise signal (Display Noise) relative to the horizontal real-time synchronization signal (Hsync), such as noise
  • the signal (Display Noise) is relatively fixed and concentrated with a certain waveform of the horizontal real-time synchronization signal (Hsync).
  • the noise signal (Display Noise) has a similar waveform to a certain waveform of the horizontal real-time synchronization signal (Hsync). This is not limited.
  • This application uses the time period in the period of the real-time synchronization signal to avoid the noise signal to trigger the generation of the coding drive signal and the detection of the signal of the touch sensor, so the trigger signal avoids the noise signal in the period of the horizontal real-time synchronization signal (Hsync)
  • the time period generates a trigger operation.
  • the strobe signal PGA_SW has the same frequency as the horizontal real-time synchronization signal (Hsync), and the width of a single high-level interval of the strobe signal PGA_SW is greater than the width of a single high-level interval of the horizontal real-time synchronization signal (Hsync) ,
  • the rising edge of the line real-time synchronization signal is outside the gating interval of the strobe signal.
  • the gating interval is a time period during which a useful signal is connected to an input end of an amplifier circuit, and the amplifier circuit outputs a non-zero level.
  • the strobe signal PGA_SW is triggered by a trigger signal after a period of time delay from the high level of the horizontal synchronization signal (Hsync) to generate a high and low level waveform, so that the high and low levels of the strobe signal PGA_SW avoid the noise caused by the display driving operation
  • the signal (DisplayNoise) that is, the noise waveform of the noise signal (DisplayNoise) and the low-level interval timing of the strobe signal PGA_SW coincide, so that the coding drive signal Vtx avoids the noise signal caused by the display drive operation (DisplayNoise) , Will not be affected by the noise signal (Display Noise) caused by the display driving operation.
  • the frequency of the coding driving signal Vtx is set to the frequency with the least noise in the working environment of the touch chip at the same time, it not only avoids the influence of noise caused by the display driving operation, but also avoids the influence of other noises in the working environment of the touch chip. In order to detect the signal-to-noise ratio of the effective signal, the touch sensitivity is greatly improved.
  • FIG. 9 and FIG. 5 The difference between FIG. 9 and FIG. 5 is that in FIG. 5, the frequency of the coding drive signal Vtx output by the coding signal generator 322 is the same as the frequency of the strobe signal, while in FIG.
  • the coding signal generator 322 outputs
  • the frequency of the coding driving signal Vtx and the frequency of the strobe signal may be different, and the frequency of the coding driving signal Vtx can change in real time according to the frequency of the smallest noise signal in the working environment of the touch chip.
  • the coding signal generator 322 in the embodiment of the present application triggers the generation of the coding driving signal Vtx under the control of the trigger signal, and adjusts the duty cycle of the coding driving signal Vtx, preferably, the output Vtx
  • the duty cycle is 50%, and Vtx can be a square wave, as shown in Figure 5.
  • the touch chip outputs a coding driving signal Vtx to the driving electrodes of the touch display panel to drive the driving electrodes to scan the touch display panel.
  • step S3 includes:
  • a coding drive signal is generated.
  • the coding signal generator 322 in the embodiment of the present application triggers to generate the coding driving signal Vtx under the control of the trigger signal, and the coding signal generator 322 generates the coding driving signal Vtx at a frequency which is the smallest in the working environment of the touch chip. The frequency of the noise.
  • the synchronization signal controller 321 generates a trigger signal, and the signal detection strobe 323 triggers to generate a strobe signal PGA_SW with a high level and a low level under the control of the trigger signal.
  • one frame and field synchronization signal corresponds to multiple horizontal synchronization signals (Hsync)
  • the strobe signal PGA_SW has the same frequency as the line real-time synchronization signal, and the width of a single high level interval of the strobe signal PGA_SW is greater than the width of the strobe signal PGA_SW.
  • the horizontal real-time synchronization signal has a single high-level interval width, the rising edge of the horizontal real-time synchronization signal is outside the gating interval of the strobe signal PGA_SW, and the strobe signal PGA_SW is delayed for a period of time after the rising edge of the horizontal synchronization signal (Hsync) Triggered by the trigger signal to generate high and low level waveforms, the strobe signal PGA_SW is in the low level period, and the low level period includes the period of displaying driving noise, so that the signal value of the touch sensor in the touch display panel is output to 0;
  • the strobe signal PGA_SW is in a high level period, and the high level period corresponds to a non-noise period of display driving, so that the touch chip detects the signal value of the touch sensor in the touch display panel.
  • the high level period of the horizontal synchronization signal avoids the noise signal (Display Noise) caused by the display driving operation, so that the detection of the touch sensor capacitance signal avoids the noise signal caused by the display driving operation (Display Noise). ), will not be affected by the noise signal (Display Noise) caused by the display driving operation.
  • S5. Receive a signal of the sensing electrode of the touch display panel, and output a detection result according to the strobe signal and the signal of the sensing electrode.
  • the embodiment of the present application uses the strobe signal PGA_SW to control whether to perform the detection of the signal value of the capacitance sensor.
  • the signal detection gate 323 of the embodiment of the present application receives the signal of the sensing electrode of the touch display panel, and under the control of the trigger signal, the signal detection gate 323 generates the selective communication during the period of avoiding display driving noise No.
  • PGA_SW detects the signal of the touch sensor during the period of avoiding the display driving noise; while the signal of the touch sensor is not detected during the period of the display driving noise, the output is 0.
  • the driving electrode Tx in the touch display panel 31 is driven by the coding driving signal Vtx, and the coupling capacitance of the driving electrode Tx and the sensing electrode Rx in the touch display panel 31 changes due to the user's touch, that is, the change in the touch display panel
  • the signal of the touch sensor is gated and detected by the signal detection gate 323 in the touch chip 32 to obtain the waveform portion of the output signal Vout.
  • the coordinates of the user's touch position in the touch display panel 31 are obtained according to the output signal Vout.
  • the method further includes:
  • the programmable gain amplifier PGA is usually used to amplify the signal value of the obtained capacitance sensor, and its circuit design is simple and the cost is low.
  • the programmable gain amplifier PGA receives the signal value of the capacitance sensor gated by the gate signal PGA_SW, and the programmable gain amplifier PGA amplifies the obtained signal value of the capacitance sensor.
  • the method further includes:
  • a low-pass anti-aliasing filter circuit AAF is used to filter out additional interference signals on the signal value of the capacitance sensor after the amplification process.
  • the circuit design is simple and the cost is low.
  • the low-pass anti-aliasing filter circuit AAF filters out additional interference signals on the signal value of the capacitance sensor after the amplification processing.
  • this application can also use other filters to filter out the interference signal of the obtained signal value of the capacitance sensor, which is not limited in this application.
  • the touch display panel 31 of the embodiment of the present application includes a touch sensor 311, a display panel 312, and a display driving chip 313.
  • the display driving chip 313 sends a real-time synchronization signal, the touch sensor 311 is coupled to the driving layer Tx and the sensing layer Rx, the display driving chip 313 is coupled to the display panel 312, and the display panel 312 is coupled to the touch control sensor 311.
  • the method further includes:
  • the clock information of the clock information external to the touch display panel and the touch chip is received, and the clock information is used to synchronize the strobe signal and the real-time synchronization signal.
  • an active clock is provided outside the touch chip 32 and the touch display panel 31.
  • the active clock may be a crystal oscillator.
  • the active clock is connected to the second PLL of the touch chip 112 ( Hase-locked-loop) frequency multiplier circuit 1103 and the first PLL frequency multiplier circuit 1101 of the display driver chip 111, and the second PLL frequency multiplier circuit 1103 of the touch chip 112 is connected to the second system of the touch chip 112
  • the clock 1104, the first PLL frequency multiplication circuit 1101 of the display driver chip 111 is connected to the first system clock 1102 of the display driver chip 111.
  • the touch chip 112 and the display driving chip 111 receive external clock information, and the clock information is used to synchronize the strobe signal and the real-time synchronization signal.
  • the method further includes:
  • the clock information of the touch display panel is received, and the clock information is used to synchronize the strobe signal and the real-time synchronization signal.
  • the touch chip 112 includes a second PLL frequency multiplication circuit 1103 and a second system clock 1104; the touch display panel includes a display driving chip 111, and the touch chip 112 includes a second PLL frequency multiplication circuit 1103 and a second system clock 1104.
  • the second system clock 1104, the display driver chip 111 outputs clock information to the second PLL frequency multiplication circuit 1103, and the second PLL frequency multiplication circuit 1103 is connected to the second system clock 1104.
  • the touch chip 112 receives the clock information of the display driving chip 111, and the clock information is used to synchronize the strobe signal and the real-time synchronization signal.
  • the method further includes:
  • the clock information is output to the touch display panel, and the clock information is used to synchronize the strobe signal and the line synchronization signal.
  • the display driver chip 111 includes a first PLL frequency multiplier circuit 1101 and a first system clock 1102; the touch chip 112 outputs clock information to the first PLL frequency multiplier circuit 1101, and the first PLL frequency multiplier circuit 1101 is connected To the first system clock 1102.
  • the touch chip 112 outputs clock information to the display driving chip 111, and the clock information is used to synchronize the strobe signal and the real-time synchronization signal.
  • the touch detection circuit includes:
  • the synchronization signal controller 321 is used to receive the real-time synchronization signal sent by the touch display panel and obtain the frequency of the noise signal in the working environment of the touch chip;
  • the coding signal generator 322 is configured to set the frequency of the coding drive signal according to the frequency of the noise signal, generate a coding drive signal according to the frequency of the coding drive signal, and output the coding drive signal To the driving electrode of the touch display panel;
  • the signal detection strobe 323 is configured to generate a strobe signal according to the real-time synchronization signal, and receive the signal of the sensing electrode of the touch display panel, and output according to the strobe signal and the signal of the sensing electrode Test results.
  • the synchronization signal controller 321 receives the real-time synchronization signal sent by the display panel of the touch display panel 31.
  • the real-time synchronization signal is a horizontal real-time synchronization signal.
  • the real-time synchronization signal (sync) includes a horizontal real-time synchronization signal (Hsync) that is correlated with a noise signal and a vertical real-time synchronization signal (Vsync) that controls the refresh rate.
  • the real-time synchronization signal (sync) of this application adopts the horizontal real-time synchronization signal (Hsync).
  • This application determines the trigger time point of the trigger signal by displaying the relationship between the noise signal caused by the driving operation and the horizontal real-time synchronization signal (Hsync).
  • the synchronization signal controller 321 is also used to obtain the frequency of the noise signal in the working environment of the touch chip; and to detect the frequency of the noise signal at each frequency in the working environment of the touch chip. Intensity, the frequency of the noise signal that is lower than the preset intensity threshold in the detected intensity of the noise signal is set as the frequency of the coding driving signal.
  • the touch chip cooperates with the touch screen to complete the touch operation
  • the working environment of the touch chip contains large noise, such as the LCD noise of the touch screen, and the frequency of this noise is equal to the frequency of the code driving signal, then It will affect the normal operation of the touch chip.
  • the touch chip cannot accurately calculate the touch coordinates or there are many errors in the calculation of the touch coordinates. Therefore, the noise signal in the working environment of the touch control chip can be detected first to avoid those high-noise frequency points, and the low-noise frequency is selected as the frequency of the coding drive signal.
  • FIG. 12 is a noise distribution diagram obtained by the noise detection module in some embodiments of the present application.
  • the noise information in the working environment of the touch chip is detected to obtain the noise information.
  • the touch control chip detects that there is a lot of noise at the frequency points f1, f2, fi, fk+1, and fn, which need to be avoided. If the noise at the frequency point fk is relatively small, the frequency point fk can be used as the frequency of the coding drive signal.
  • the strobe signal and the horizontal real-time synchronization signal have the same frequency.
  • the width of a single high-level interval of the strobe signal is greater than the width of a single high-level interval of the line real-time synchronization signal.
  • the rising edge of the line real-time synchronization signal is outside the gating interval of the gating signal.
  • the intensity of the noise signal of each frequency in the working environment of the touch chip is detected, and the frequency of the noise signal whose intensity is lower than a preset intensity threshold among the detected intensity of the noise signal is set Is the frequency of the coding drive signal.
  • the intensity of the noise signal detected at each frequency in the working environment of the touch chip can be compared with a preset intensity threshold.
  • selecting the frequency point with the smallest noise as the frequency of the coding signal output by the coding signal generator can be realized by a comparison function. Assuming that the set of frequency points in the working environment of the touch chip is ⁇ f1, f2,...fi,...fn ⁇ , set the noise intensity at the frequency points of f1, f2,...fi,...fn to be P(f1), P(f2) ),...P(fi), P(fn), and set a variable Min.
  • Min P(f1)
  • Min P(f2)
  • P(fi) P(fn)
  • Min is greater than any of P(fk)
  • set Min equal to this P(fk).
  • the modified Min is the frequency with the smallest noise
  • the frequency of the noise signal is set as the frequency at which the coding signal generator outputs the coding driving signal.
  • the frequency of the minimum noise as the frequency of the coding signal generator 322 outputting the coding driving signal, the influence of noise in the working environment of the touch chip on touch detection is further reduced, and the touch coordinate calculation of the touch chip is improved. The accuracy of the information.
  • the synchronization signal controller 321 includes:
  • the correlation obtaining unit 3211 is configured to obtain the correlation between the noise signal caused by the display driving operation of the touch display panel and the real-time synchronization signal.
  • the signal generating unit 3212 is configured to generate a trigger signal according to the correlation, and the trigger signal is used to determine a time period in the real-time synchronization signal to avoid the noise signal.
  • the signal detection strobe 323 is also used to, according to the trigger signal, root
  • the generation of the strobe signal is triggered in a time period when the noise signal is avoided in the real-time synchronization signal.
  • the correlation includes that the edge position of the noise signal relative to the line real-time synchronization signal is fixed and concentrated.
  • the circuit further includes:
  • the amplifier 324 is used to amplify the detected signal of the touch sensor
  • the low-pass anti-aliasing filter 325 is used to filter out additional interference signals on the amplified touch sensor signal.
  • the signal detection strobe 323 is also used to:
  • the noise signal of the touch sensor in the touch display panel is gated and connected to the other input terminal of the amplifier circuit, the other input terminal of the amplifier circuit is connected to the reference voltage, and the output terminal of the amplifier circuit is at zero level.
  • the signal detection gate 323 includes a differential circuit.
  • the signal detection gate 323 gates the signal value of the capacitance sensor and connects one input terminal of the differential circuit, and the other of the differential circuit The input terminal inputs the reference voltage Vref, so the output terminal of the differential circuit is zero level, so that the output signal Vout during the display driving noise period is a zero level.
  • the useful signal of the touch sensor in the touch display panel is gated and connected to an input terminal of an amplifier circuit, and the amplifier circuit outputs a non-zero level;
  • the noise signal of the sensor is gated and connected to the other input terminal of the amplifier circuit, the other input terminal of the amplifier circuit is connected to a reference voltage, and the output terminal of the amplifier circuit is at zero level.
  • the differential circuit of the present application does not include a buffer, which can further reduce the influence of noise caused by the buffer.
  • the embodiment of the present application also provides a touch control chip, which includes the touch detection circuit in any embodiment of the present application.
  • the display driver chip uses the on-chip RC oscillator as an active clock, and the temperature drift and jitter of the horizontal synchronization signal output by it are large. Because the center frequency of the horizontal synchronization signal floats, the horizontal synchronization signal is synchronized with the field. The rising edge of the signal is not synchronized, which causes the strobe signal and the horizontal synchronization signal to be not synchronized. The trigger synchronization error of the demodulated asynchronous signal and the jitter of the horizontal synchronization signal itself will cause the signal-to-noise ratio of the demodulated signal to decrease.
  • the embodiment of the present application further optimizes the performance by allowing the touch chip and the display driver chip to share the source clock, as shown in FIG. 10, where the circuit connection diagram of the touch display panel and the touch chip is consistent with that of FIG. 3a
  • the difference is that the touch control chip and the display drive chip share a source clock, so that the strobe signal PGA_SW is synchronized with the line synchronization signal Hsync in real time, which can better avoid the display interference interval.
  • An embodiment of the application provides an electronic device, which includes the touch chip in any embodiment of the application
  • the electronic device further includes an active clock 113.
  • the touch control chip 112 includes the touch detection circuit in any embodiment of the present application, the second PLL frequency multiplication circuit 1103 and the second system clock 1104, and the display driving chip 111 It includes a first PLL frequency multiplication circuit 1101 and a first system clock 1102.
  • the active clock 113 external to the display driver chip 111 and the touch chip 112 outputs clock information to the first PLL frequency multiplier circuit 1101 of the display driver chip 111 and the second PLL frequency multiplier circuit 1103 of the touch chip 112, and the first PLL frequency multiplies
  • the circuit 1101 outputs to the first system clock 1102, and the second PLL frequency multiplication circuit 1103 outputs to the second system clock 1104.
  • the touch chip 112 and the display driver chip 111 share a source clock, so that the strobe signal PGA_SW is synchronized with the line synchronization signal Hsync in real time, which better avoids the display interference interval, and realizes the communication between the display driver chip 111 and the touch chip 112. Perfect synchronization. Real-time synchronization can be performed even when the touch display panel is off.
  • Another embodiment of the present application also provides a schematic diagram of a synchronization circuit between a touch chip and a touch display panel.
  • the display driver chip 111 is used to output clock information to the second PLL frequency multiplication circuit 1103 of the touch chip 112.
  • the second PLL frequency multiplication circuit 1103 of the touch chip is connected to the second system clock 1104 of the touch chip 112 to achieve perfect synchronization between the display driver chip 111 and the touch chip 112.
  • FIG. 11c Another embodiment of the present application also provides a schematic diagram of a synchronization circuit between a touch chip and a touch display panel.
  • the touch chip 112 is used to output clock information to the first PLL frequency multiplication circuit 1101 of the display driver chip 111.
  • the first PLL frequency multiplication circuit 1101 of the display driver chip 111 is connected to the second system clock 1102 to achieve perfect synchronization between the display driver chip 111 and the touch chip 112.
  • the electronic devices of the embodiments of the present application exist in various forms, including but not limited to:
  • Mobile communication equipment This type of equipment is characterized by mobile communication functions, and its main goal is to provide voice and data communications.
  • Such terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.
  • Ultra-mobile personal computer equipment This type of equipment belongs to the category of personal computers, has calculation and processing functions, and generally also has mobile Internet features.
  • Such terminals include: PDA, MID and UMPC devices, such as iPad.
  • Portable entertainment equipment This type of equipment can display and play multimedia content.
  • Such devices include: audio, video players (such as iPod), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.
  • Server A device that provides computing services.
  • the structure of a server includes a processor 810, hard disk, memory, system bus, etc.
  • the server is similar to a general computer architecture, but because it needs to provide highly reliable services, it is High requirements in terms of performance, reliability, security, scalability, and manageability.
  • a programmable logic device Programmable Log chip Dev chip e, PLD
  • FPGA Field Programmable Gate Array
  • HDL Hardware Description Language
  • ABEL Advanced Boolean Expression Language
  • AHDL Altera Hardware Description Language
  • HDCal JHDL
  • Java Hardware Description Language Lava, Lola, MyHDL, PALASM, RHDL (Ruby Hardware Description), etc.
  • VHDL Very-High-Speed Integrated Circuit Hardware Description Language
  • Verilog Verilog
  • the controller can be implemented in any suitable manner.
  • the controller can take the form of, for example, a microprocessor or a processor and a computer-readable medium storing computer-readable program codes (such as software or firmware) executable by the (micro)processor.
  • controllers include but are not limited to the following microcontrollers: ARC625D , Atmel AT91SAM, M chip rochip P chip 18F26K20 and Sil chip one Labs C8051F320, the memory controller can also be implemented as a part of the control logic of the memory.
  • controllers in addition to implementing the controller in a purely computer-readable program code manner, it is entirely possible to program the method steps to make the controller use logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded logic.
  • the same function can be realized in the form of a microcontroller, etc. Therefore, such a controller can be regarded as a hardware component, and the devices included in it for realizing various functions can also be regarded as a structure within the hardware component. Or even, the device for realizing various functions can be regarded as both a software module for realizing the method and a structure within a hardware component.
  • a typical implementation device is a computer.
  • the computer may be, for example, a personal computer, a laptop computer, a cell phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or Any combination of these devices.
  • this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • the computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
  • processors CPUs
  • input/output interfaces network interfaces
  • memory volatile and non-volatile memory
  • the memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM).
  • RAM random access memory
  • ROM read-only memory
  • flash RAM flash memory
  • Computer-readable media include permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology.
  • the information can be computer-readable instructions, data structures, program modules, or other data.
  • Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices. According to the definition in this article, computer-readable media does not include transitory media, such as modulated data signals and carrier waves.
  • this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • This application may be described in the general context of computer-executable instructions executed by a computer, such as a program module.
  • program modules include routines, programs, objects, components, data structures, etc. that perform specific transactions or implement specific abstract data types.
  • This application can also be practiced in distributed computing environments. In these distributed computing environments, transactions are executed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

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Abstract

一种触控检测方法、触控检测电路、触控芯片以及电子设备。触控检测方法包括：接收触控显示面板发送的实时同步信号（S1）；获取触控芯片工作环境中噪声信号的频率（S2）；根据所述噪声信号的频率，设置所述打码驱动信号的频率，根据所述打码驱动信号的频率生成打码驱动信号，并输出所述打码驱动信号至所述触控显示面板的驱动电极（S3）；根据所述实时同步信号，生成选通信号（S4）；接收所述触控显示面板的感应电极的信号，根据所述选通信号和所述感应电极的信号，输出检测结果（S5）。该方法受显示器显示驱动操作和触控芯片工作环境中噪声信号的影响很小，改善了最终检测出有效信号的信号噪声比，使触摸灵敏度大幅提升。

Description

触控检测方法、触控检测电路、触控芯片以及电子设备 技术领域
本申请实施例涉及触控技术领域，尤其涉及一种触控检测方法、触控检测电路、触控芯片以及电子设备。
背景技术
显示器的驱动信号对触控传感器的感应线通常会造成干扰，且所造成的干扰会随显示画面的变化而变化，这种干扰信号有时会非常大。目前的触控芯片在工作环境中面对的噪声信号干扰和显示器强驱动噪声信号干扰时，存在触控灵敏度低的问题。
发明内容
有鉴于此，本申请实施例提供一种触控检测方法、触控检测电路、触控芯片以及电子设备，用以克服或者缓解现有技术中的触控检测受显示器驱动干扰信号以及触控芯片工作环境中噪声信号所造成检测灵敏度低的技术问题。
本申请实施例提供了一种触控检测方法，包括：接收触控显示面板发送的实时同步信号；获取触控芯片工作环境中噪声信号的频率；根据噪声信号的频率，设置打码驱动信号的频率，根据所述打码驱动信号的频率生成打码驱动信号，并输出打码驱动信号至触控显示面板的驱动电极；根据实时同步信号，生成选通信号；接收触控显示面板的感应电极的信号；根据选通信号和感应电极的信号，输出检测结果。
本申请实施例提供一种触控检测电路，包括：同步信号控制器，用于接收触控显示面板发送的实时同步信号，以及获取触控芯片工作环境中噪声信号的频率；打码信号产生器，用于根据所述噪声信号的频率，设置所述打码驱动信号的频率，根据所述打码驱动信号的频率生成打码驱动信号，并输出所述打码驱动信号至所述触控显示面板的驱动电极；信号检测选通器，用于根据所述 实时同步信号，生成选通信号，以及接收所述触控显示面板的感应电极的信号，根据所述选通信号和所述感应电极的信号，输出检测结果。
本申请实施例提供一种触控芯片，其包括本申请任一实施例中的触控检测电路。
本申请实施例提供一种电子设备，其包括触控芯片和触控显示面板，触控芯片包括本申请任一实施例中的触控检测电路以及第二PLL倍频电路，所述触控显示面板包括第一PLL倍频电路。
本申请实施例提供的技术方案中，通过接收触控显示面板发送的实时同步信号；获取触控芯片工作环境中噪声信号的频率；根据所述噪声信号的频率，设置所述打码驱动信号的频率，根据所述打码驱动信号的频率生成打码驱动信号，并输出打码驱动信号至所述触控显示面板的驱动电极；根据所述实时同步信号，生成选通信号；接收所述触控显示面板的感应电极的信号，根据所述选通信号和所述感应电极的信号，输出检测结果。因此，本申请实施例通过在避开所述显示驱动噪声期间，对触控传感器进行打码和信号检测，其感应电极不仅能检测出较大的有效信号量，通过获取触控芯片工作环境中噪声信号的频率，设置打码驱动信号的频率，使其接收到的信号所受噪声影响最小，通过在避开显示器驱动噪声期间生成选通信号，在选通期间对有用信号进行检测，使其触控芯片受显示器显示驱动操作的影响很小，改善了最终检测出有效信号的信号噪声比，使触摸灵敏度大幅提升。
附图说明
后文将参照附图以示例性而非限制性的方式详细描述本申请实施例的一些具体实施例。附图中相同的附图标记标示了相同或类似的部件或部分。本领域技术人员应该理解，这些附图未必是按比例绘制的。附图中：
图1为本申请实施例中触控系统的结构示意图；
图2为本申请实施例中一种触控检测方法的流程图；
图3a为本申请实施例中一种触控检测电路的电路图；
图3b为本申请实施例中一种触控显示面板的结构示意图；
图4为本申请实施例中一种触控检测方法中的部分流程图；
图5为本申请实施例中体现同频信号关联关系的时序示意图；
图6为本申请另一实施例中触控显示面板的触控检测方法的流程图；
图7为本申请再一实施例中触控显示面板的触控检测方法的流程图；
图8为再一实施例中一种触控检测电路的同步信号控制器结构示意图；
图9为本申请实施例中体现跳频信号关联关系的时序示意图；
图10为本申请另一实施例中一种触控检测电路的电路图；
图11a为本申请实施例中触控显示面板和触控芯片共有源时钟的结构示意图；
图11b为本申请另一实施例中触控显示面板和触控芯片共有源时钟的结构示意图；
图11c为本申请另一实施例中触控显示面板和触控芯片共有源时钟的结构示意图；
图12为本申请实施例中噪声检测模块得到的噪声分布图。
具体实施方式
本申请实施例的任一技术方案并不一定需要同时达到以上的所有优点。
参见图1，触控系统包括触控显示面板、触控芯片12和主机13，触控显示面板包括触控传感器11和显示面板14。触控传感器11为两层结构，这里将其中的驱动层叫做Tx层、感应层叫做Rx层，驱动层包括多个驱动电极Tx1、Tx2、Tx3等，感应层包括多个感应电极Rx1、Rx2、Rx3等，在驱动层和感应层下方为显示面板14。显示面板14的驱动干扰信号会对驱动层和感应层的感测精度造成影响，尤其是对于Y-OCTA技术的显示面板而言，因为该技术将触控传感器11和显示面板14一起一次性进行制作成触控显示面板，显示面板14距离驱动层和感应层更近，其显示面板14对驱动层和感应层的感测精度造成的影响也大幅度变大，导致触摸灵敏度下降更加明显。
本申请实施例提供的技术方案中，通过接收触控显示面板发送的实时同步信号；获取触控芯片工作环境中噪声信号的频率；根据所述噪声信号的频率，设置打码驱动信号的频率，根据所述打码驱动信号的频率生成打码驱动信号，并输出打码驱动信号至触控显示面板的驱动电极；根据实时同步信号，生成选通信号；接收触控显示面板的感应电极的信号，根据选通信号和所述感应电极的信号，输出检测结果。因此，本申请实施例通过在避开显示驱动噪声期间，对触控传感器进行信号检测，根据触控芯片工作环境中噪声信号的变化设置打码驱动信号的频率，极大的避免触控芯片工作环境中的噪声信号影响以及显示 驱动噪声信号影响，使其触控芯片不仅能检测出较大的有效信号量，改善了最终检测出有效信号的信号噪声比，使触摸灵敏度大幅提升。
下面结合本申请实施例附图进一步说明本申请实施例具体实现。
图2为本申请实施例一种触控显示面板的触控检测方法的流程图。
所述方法包括：
S1、接收触控显示面板发送的实时同步信号。
参见图3a以及图3b，本申请实施例触控显示面板31包括触控传感器311、显示面板312、显示驱动芯片313。显示驱动芯片313向触控芯片32发送实时同步信号，显示驱动芯片313连接至显示面板312，显示面板312耦接触控传感器311。触控芯片32包括：同步信号控制器321、打码信号产生器322以及信号检测选通器323。同步信号控制器321接收触控显示面板31中显示驱动芯片313发送的实时同步信号。
实时同步信号(sync)包括：与噪声信号具有相关性的行实时同步信号(Hsync)以及控制刷新率的场实时同步信号(Vsync)。
具体地，本申请实时同步信号(sync)采用行实时同步信号(Hsync)。根据实时同步信号生成避开显示驱动噪声期间的触发信号，触发信号能够在避开显示驱动噪声期间对系统操作进行触发操作。
S2、获取触控芯片工作环境中噪声信号的频率。
在触控芯片配合触控屏完成触控操作时，如果触控芯片工作环境中包含较大噪声，比如说触控屏的LCD噪声，且该噪声的频率与打码驱动信号的频率相等，则会对触控芯片的正常工作产生影响。比如说，触控芯片无法准确计算触控坐标或者计算触控坐标有很多误差。因此可以在先通过检测触控芯片工作环境中的噪声信号，避开那些噪声很大的频率点，选择噪声小的频率作为打码驱动信号的频率。
在本申请一具体实施例中，步骤S2包括：
S21、获取触控芯片工作环境中噪声信号的频率；
S22、检测触控芯片工作环境中各频率的噪声信号的强度，将检测到的噪声信号的强度中低于预设强度阈值的噪声信号的频率设置为打码驱动信号的频率。
具体地，参见图12，图12是本申请一些实施例中噪声检测模块得到的噪声分布图。在本实施例中，在打码信号产生器输出打码信号之前，先对触控芯片工作环境中的噪声信息进行检测以获取的噪声信号。触控芯片检测f1、f2、fi、fk+1和fn频点上均存在很大噪声信号，需要避开。fk处频点的噪声信号较 小，则将fk处频点可以作为打码驱动信号的频率。
具体地，为设置打码信号产生器322输出打码驱动信号的频率最佳，可以将检测到触控芯片工作环境中各频率的噪声信号的强度与预设强度阈值作比较。具体地，选取噪声最小的频率点为打码信号产生器输出打码信号的频率可以通过一比较函数实现。假设触控芯片工作环境中频点集合为{f1,f2,…fi，…fn}，设置f1、f2、……fi、……fn频点上的噪声强度分别为P(f1)、P(f2)、……P(fi)、P(fn)，并设置一变量Min。首先设Min＝P(f1),然后令Min分别与P(f2)、……P(fi)、P(fn)比较。当Min大于其中任一P(fk)时，设Min等于该P(fk)。然后将修改后的Min再与剩下的噪声强度进行比较，一直到与P(fn)比较结束。此时，Min对应的频率即为噪声最小的频率，并设置该噪声信号的频率为打码信号产生器输出打码驱动信号的频率。
本实施例通过设置最小噪声的频率为打码信号产生器322输出打码驱动信号的频率，从而进一步降低了触控芯片工作环境中的噪声对触摸检测的影响，提高了触控芯片计算触摸坐标信息的准确性。
需要说明的是，上述任一实施例中关于噪声强度的定义，可以是将噪声转换为相应的电信号，并以该噪声电信号的一些参数作为表征噪声强度的量，比如说电压、能量、方差或者功率等。
打码信号产生器322以不同的频率输出打码驱动信号切换工作频率是通过跳频来实现，跳频的方法还可以有很多种。本实施例还可以用跳频函数来实现，这里定义跳频的函数为fi+1＝next(fi)。fi是第i次打码信号产生器322输出打码驱动信号的频率。fi+1是第i+1次打码信号产生器322输出打码驱动信号的频率。next是跳频算法函数，指定了由fi跳到fi+1的规则。
本申请提供一实施例，参见图4，该触控检测方法还包括：
S111、获得触控显示面板的显示驱动操作所引起的噪声信号与实时同步信号的相关性。
具体地，本申请实时同步信号(sync)采用行实时同步信号(Hsync)。本申请通过显示驱动操作所引起的噪声信号与行实时同步信号(Hsync)的关系，确定触发信号的触发时间点。
参见图5，在触控显示面板中，当显示数据信号改变时，会发生由于显示驱动操作引起的噪声，如噪声信号(Display Noise)波形所示。噪声信号(Display Noise)波形时域分布同行实时同步信号(Hsync)信号强相关。相关性包括噪声信号(Display Noise)相对行实时同步信号(Hsync)边沿位置较为固定且集中，因此，每个行实时同步信号(Hsync)周期中有一段时间段包括 噪声信号(Display Noise)。
但是相关性并不仅限于噪声信号(Display Noise)相对行实时同步信号(Hsync)边沿位置较为固定且集中，还包括噪声信号(Display Noise)相对行实时同步信号(Hsync)的其他关联性，比如噪声信号(Display Noise)相对行实时同步信号(Hsync)的某段波形较为固定且集中，再比如噪声信号(Display Noise)相对行实时同步信号(Hsync)的某段波形具有相似波形等，本申请对此不进行限定。
S112、根据相关性，生成触发信号，所述触发信号用来确定所述实时同步信号中避开所述噪声信号的时间段。
本申请利用实时同步信号周期中避开噪声信号的时间段，触发生成打码驱动信号以及对触控传感器的信号进行检测，因此触发信号在行实时同步信号(Hsync)周期中避开噪声信号的时间段产生触发操作。
参见图9，所述选通信号PGA_SW与所述行实时同步信号(Hsync)频率相同，选通信号PGA_SW的单个高电平区间宽度大于所述行实时同步信号(Hsync)单个高电平区间宽度，所述行实时同步信号的上升沿位于所述选通信号的选通区间之外。所述选通区间为有用信号连接放大器电路的一输入端，所述放大器电路输出非零电平的时间段。选通信号PGA_SW在行同步信号(Hsync)的高电平延后一段时间被触发信号触发生成高低电平波形，令选通信号PGA_SW的高电平和低电平避开显示驱动操作所引起的噪声信号(Display Noise)，即噪声信号(Display Noise)的噪声波形和选通信号PGA_SW的低电平区间时序重合，从而令打码驱动信号Vtx避开显示驱动操作所引起的噪声信号(Display Noise)，不会受到显示驱动操作所引起的噪声信号(Display Noise)的影响。由于同时将打码驱动信号Vtx的频率设置为触控芯片工作环境中噪声最小的频率，不仅避免了显示驱动操作带来噪声影响，还避免了触控芯片工作环境中的其它噪声的影响，改善了最终检测出有效信号的信号噪声比，使触摸灵敏度大幅提升。图9与图5的区别在于，在图5中，打码信号产生器322输出的打码驱动信号Vtx的频率与选通信号的频率相同，而在图9中，打码信号产生器322输出的打码驱动信号Vtx的频率与选通信号的频率可以不相同，打码驱动信号Vtx的频率可以根据触控芯片工作环境中最小噪声信号的频率而实时发生变化。
S3、根据所述噪声信号的频率，设置打码驱动信号的频率，根据所述打码驱动信号的频率生成打码驱动信号，并输出所述打码驱动信号至触控显示面板的驱动电极。
具体地，参见图3a，本申请实施例打码信号产生器322在触发信号的控制下，触发生成打码驱动信号Vtx，并调整打码驱动信号Vtx的占空比，优选的，输出Vtx的占空比为50％，Vtx可以是方波波形，如图5所示。触控芯片输出打码驱动信号Vtx至触控显示面板的驱动电极，以驱动驱动电极对触控显示面板进行扫描。
在本申请一具体实施例中，步骤S3包括：
根据触发信号，生成打码驱动信号。
具体地，本申请实施例打码信号产生器322在触发信号的控制下，触发生成打码驱动信号Vtx，打码信号产生器322生成打码驱动信号Vtx的频率为触控芯片工作环境中最小噪声的频率。
S4、根据所述实时同步信号，生成选通信号。
本申请实施例中，根据所述实时同步信号，同步信号控制器321生成触发信号，信号检测选通器323在触发信号的控制下，触发生成具有高电平和低电平的选通信号PGA_SW。参见图5和图9，一帧场同步信号对应多个行同步信号(Hsync)，选通信号PGA_SW与所述行实时同步信号频率相同，选通信号PGA_SW的单个高电平区间宽度大于所述行实时同步信号单个高电平区间宽度，行实时同步信号的上升沿位于所述选通信号PGA_SW的选通区间之外，选通信号PGA_SW在行同步信号(Hsync)的上升沿延后一段时间被触发信号触发生成高低电平波形，选通信号PGA_SW处于低电平期间，低电平的时间段包括显示驱动噪声的时间段，使触控显示面板中触控传感器的信号值输出为0；选通信号PGA_SW处于高电平期间，高电平的时间段对应显示驱动非噪声的时间段，使触控芯片对触控显示面板中触控传感器的信号值进行检测。行同步信号(Hsync)的高电平期间是避开显示驱动操作所引起的噪声信号(Display Noise)的，从而令触控传感器电容信号的检测避开显示驱动操作所引起的噪声信号(Display Noise)，不会受到显示驱动操作所引起的噪声信号(Display Noise)的影响。
S5、接收所述触控显示面板的感应电极的信号，根据所述选通信号和所述感应电极的信号，输出检测结果。
具体地，本申请实施例采用选通信号PGA_SW对是否进行电容传感器的信号值的检测进行控制。参见图3a，本申请实施例信号检测选通器323接收所述触控显示面板的感应电极的信号，在触发信号的控制下，信号检测选通器323生成避开显示驱动噪声期间的选通信号PGA_SW，在避开显示驱动噪声期间对触控传感器的信号进行检测；而在显示驱动噪声期间不对触控传感器的信号进 行检测，输出为0。
触控显示面板31中的驱动电极Tx被打码驱动信号Vtx驱动，触控显示面板31中的驱动电极Tx和感应电极Rx的耦合电容因用户触摸而产生的变化，即为触控显示面板中触控传感器的信号。触控显示面板中触控传感器的信号被触控芯片32中的信号检测选通器323选通进行检测以获得输出信号Vout的波形部分。从而根据输出信号Vout获得触控显示面板31中的用户触控位置坐标。
在本申请另一具体实施例中，参见图6，方法还包括：
S6、对检测获得的电容传感器的信号值进行放大处理。
通常采用可编程增益放大器PGA对获得的电容传感器的信号值进行放大处理，其电路设计简单，成本低廉。
具体地，参见图3a和图3b，可编程增益放大器PGA接收到被选通信号PGA_SW选通的电容传感器的信号值，可编程增益放大器PGA对获得的电容传感器的信号值进行放大处理。
当然，本申请也可以采用其他放大器来实现对获得的电容传感器的信号值进行放大处理，本申请对此并不进行限定。
在本申请另一具体实施例中，参见图7，方法还包括：
S7、对放大处理后的电容传感器的信号值进行额外干扰信号的滤除。
通常采用低通抗混叠滤波器电路AAF对放大处理后的电容传感器的信号值进行额外干扰信号的滤除，其电路设计简单，成本低廉。
具体地，参见图3a，低通抗混叠滤波器电路AAF对放大处理后的电容传感器的信号值进行额外干扰信号的滤除。
当然，本申请也可以采用其他滤波器来实现对获得的电容传感器的信号值进行干扰信号滤除，本申请对此并不进行限定。
参见图3a以及图3b，本申请实施例触控显示面板31包括触控传感器311、显示面板312、显示驱动芯片313。显示驱动芯片313发送实时同步信号，触控传感器311耦接驱动层Tx和感应层Rx，显示驱动芯片313耦接显示面板312，显示面板312耦接触控传感器311。
在本申请另一具体实施例中，方法还包括：
接收触控显示面板和触控芯片外部的时钟信息的时钟信息，时钟信息用于同步选通信号和实时同步信号。
具体的，参见图10，触控芯片32和触控显示面板31的外部设置有一有源时钟，该有源时钟可以是晶振，参加图11a，有源时钟连接触控芯片112的第二PLL(hase-locked-loop，锁相环)倍频电路1103以及显示驱动芯片111 的第一PLL倍频电路1101，触控芯片112的第二PLL倍频电路1103连接至触控芯片112的第二系统时钟1104，显示驱动芯片111的第一PLL倍频电路1101连接至显示驱动芯片111的第一系统时钟1102。触控芯片112和显示驱动芯片111接收外部的时钟信息，时钟信息用于同步选通信号和实时同步信号。
在本申请另一具体实施例中，方法还包括：
接收触控显示面板的时钟信息，时钟信息用于同步选通信号和实时同步信号。
具体的，参见图11b，触控芯片112包括第二PLL倍频电路1103以及第二系统时钟1104；触控显示面板包括显示驱动芯片111，触控芯片112包括第二PLL倍频电路1103和第二系统时钟1104，显示驱动芯片111输出时钟信息至第二PLL倍频电路1103，第二PLL倍频电路1103连接至第二系统时钟1104。触控芯片112接收显示驱动芯片111的时钟信息，时钟信息用于同步选通信号和实时同步信号。
在本申请另一具体实施例中，方法还包括：
输出时钟信息至触控显示面板，时钟信息用于同步选通信号和行同步信号。
具体的，参见图11c，显示驱动芯片111包括第一PLL倍频电路1101以及第一系统时钟1102；触控芯片112输出时钟信息至第一PLL倍频电路1101，第一PLL倍频电路1101连接至第一系统时钟1102。触控芯片112输出时钟信息至显示驱动芯片111，时钟信息用于同步选通信号和实时同步信号。
在本申请一实施例中，参见图3a和图3b，触控检测电路包括：
同步信号控制器321，用于接收触控显示面板发送的实时同步信号以及获取触控芯片工作环境中噪声信号的频率；
打码信号产生器322，用于根据所述噪声信号的频率，设置所述打码驱动信号的频率，根据所述打码驱动信号的频率生成打码驱动信号，并输出所述打码驱动信号至所述触控显示面板的驱动电极；
信号检测选通器323，用于根据所述实时同步信号，生成选通信号，以及接收所述触控显示面板的感应电极的信号，根据所述选通信号和所述感应电极的信号，输出检测结果。
同步信号控制器321接收触控显示面板31中显示面板发送的实时同步信号。
在本申请一具体实现中，所述实时同步信号为行实时同步信号。实时同步信号(sync)包括与噪声信号具有相关性的行实时同步信号(Hsync)以及控 制刷新率的场实时同步信号(Vsync)。
具体地，本申请实时同步信号(sync)采用行实时同步信号(Hsync)。本申请通过显示驱动操作所引起的噪声信号与行实时同步信号(Hsync)的关系，确定触发信号的触发时间点。
在本申请一具体实现中，参见图10，同步信号控制器321还用于，获取触控芯片工作环境中噪声信号的频率；检测所述触控芯片工作环境中各频率的所述噪声信号的强度，将检测到的所述噪声信号的强度中低于预设强度阈值的噪声信号的频率设置为所述打码驱动信号的频率。
在触控芯片配合触控屏完成触控操作时，如果触控芯片工作环境中包含较大噪声，比如说触控屏的LCD噪声，且该噪声的频率与打码驱动信号的频率相等，则会对触控芯片的正常工作产生影响。比如说，触控芯片无法准确计算触控坐标或者计算触控坐标有很多误差。因此可以在先通过检测触控芯片工作环境中的噪声信号，避开那些噪声很大的频率点，选择噪声小的频率作为打码驱动信号的频率。
具体地，参见图12，图12是本申请一些实施例中噪声检测模块得到的噪声分布图。在本实施例中，在打码信号产生器输出打码信号之前，先对触控芯片工作环境中的噪声信息进行检测以获取的噪声信息。触控芯片检测f1、f2、fi、fk+1和fn频点上均存在很大噪声，需要避开。fk处频点的噪声较小，则将fk处频点可以作为打码驱动信号的频率。
在本申请一具体实现中，所述选通信号与所述行实时同步信号频率相同。
在本申请一具体实现中，所述选通信号的单个高电平区间宽度大于所述行实时同步信号单个高电平区间宽度。
在本申请一具体实现中，所述行实时同步信号的上升沿位于所述选通信号的选通区间之外。
在本申请一具体实现中，检测所述触控芯片工作环境中各频率的所述噪声信号的强度，将检测到的所述噪声信号的强度中低于预设强度阈值的噪声信号的频率设置为所述打码驱动信号的频率。
具体地，为设置打码信号产生器322输出打码驱动信号的频率最佳，可以将检测到触控芯片工作环境中各频率的噪声信号的强度与预设强度阈值作比较。具体地，选取噪声最小的频率点为打码信号产生器输出打码信号的频率可以通过一比较函数实现。假设触控芯片工作环境中频点集合为{f1,f2,…fi，…fn}，设置f1、f2、……fi、……fn频点上的噪声强度分别为P(f1)、P(f2)、……P(fi)、P(fn)，并设置一变量Min。首先设Min＝P(f1),然后令Min分别 与P(f2)、……P(fi)、P(fn)比较。当Min大于其中任一P(fk)时，设Min等于该P(fk)。然后将修改后的Min再与剩下的噪声强度进行比较，一直到与P(fn)比较结束。此时，Min对应的频率即为噪声最小的频率，并设置该噪声信号的频率为打码信号产生器输出打码驱动信号的频率。
本实施例通过设置最小噪声的频率为打码信号产生器322输出打码驱动信号的频率，从而进一步降低了触控芯片工作环境中的噪声对触摸检测的影响，提高了触控芯片计算触摸坐标信息的准确性。
在本申请一具体实现中，参见图8，同步信号控制器321包括：
相关性获得单元3211，用于获得触控显示面板的显示驱动操作所引起的噪声信号与实时同步信号的相关性。
信号生成单元3212，用于根据相关性，生成触发信号，所述触发信号用来确定所述实时同步信号中避开所述噪声信号的时间段。
在本申请一具体实现中，信号检测选通器323还用于，根据触发信号，根
据所述触发信号，在所述实时同步信号中避开所述噪声信号的时间段触发生成所述选通信号。
在本申请一具体实现中，所述相关性包括所述噪声信号相对所述行实时同步信号边沿位置固定且集中。
在本申请一具体实现中，参见图10，电路还包括：
放大器324，用于对检测获得的触控传感器的信号进行放大处理；
低通抗混叠滤波器325，用于对放大处理后的触控传感器的信号进行额外干扰信号的滤除。
在本申请一具体实现中，参见图3a，信号检测选通器323还用于，
将触控显示面板中触控传感器的有用信号选通连接放大器电路的一输入端，放大器电路输出非零电平；
将触控显示面板中触控传感器的噪声信号选通连接放大器电路的另一输入端，放大器电路的另一输入端连接参考电压，放大器电路的输出端为零电平。
参看图3a，本申请在显示驱动噪声期间，信号检测选通器323包括差分电路，信号检测选通器323对电容传感器的信号值选通连接差分电路的一个输入端，而差分电路的另一个输入端输入参考电压Vref，因此差分电路的输出端为零电平，从而实现在显示驱动噪声期间的输出信号Vout为一零电平。本申请实施例中，将所述触控显示面板中触控传感器的有用信号选通连接放大器 电路的一输入端，所述放大器电路输出非零电平；将所述触控显示面板中触控传感器的噪声信号选通连接所述放大器电路的另一输入端，所述放大器电路的另一输入端连接参考电压，所述放大器电路的输出端为零电平。本申请的差分电路不包括缓冲器Buffer，能够进一步降低缓冲器Buffer带来的噪声影响。
本申请实施例还提供一种触控芯片，其包括本申请任一实施例中的触控检测电路。
通常情况下，显示驱动芯片使用的是片内RC振荡器作为有源时钟，其输出的行同步信号温度漂移及抖动都较大，由于行同步信号中心频率飘大，使得行同步信号与场同步信号的上升沿不同步，从而导致选通信号和行同步信号不同步，解调异步信号的触发同步误差以及行同步信号本身的抖动，将会导致解调出的信号信噪比有所降低。为了避免这样的问题，本申请实施例通过让触控芯片与显示驱动芯片共有源时钟，进一步优化性能，参见图10，其中，触控显示面板和触控芯片的电路连接图与图3a的一致，不同的是，触控芯片与显示驱动芯片通过共有源时钟，使得选通信号PGA_SW实时与行同步信号Hsync同步，较好地避开显示器干扰区间段。
通过触控芯片与显示驱动芯片共有源时钟，不存在异步信号的触发同步误差，Hsync、Vtx、PGA_SW、解调正弦参考信号之间都不会相对抖动，使得解调出的信号SNR上限值进一步提高，整体性能进一步提升。
本申请实施例提供一种电子设备，其包括本申请任一实施例中的触控芯片
以及触控显示面板。参见图11a，该电子设备还包括有源时钟113，触控芯片112包括本申请任一实施例中的触控检测电路、第二PLL倍频电路1103以及第二系统时钟1104，显示驱动芯片111包括第一PLL倍频电路1101以及第一系统时钟1102。显示驱动芯片111和触控芯片112外部的有源时钟113输出时钟信息给显示驱动芯片111的第一PLL倍频电路1101以及触控芯片112的第二PLL倍频电路1103，第一PLL倍频电路1101输出至第一系统时钟1102，第二PLL倍频电路1103输出至第二系统时钟1104。触控芯片112与显示驱动芯片111通过共有源时钟，使得选通信号PGA_SW实时与行同步信号Hsync同步，较好地避开显示器干扰区间段，实现显示驱动芯片111和触控芯片112之间的完美同步。即使触控显示面板息屏时，也能进行实时同步。
本申请另实施例还提供一种触控芯片与触控显示面板的同步电路示意图，参见图11b，显示驱动芯片111用于将时钟信息输出至触控芯片112的第二PLL倍频电路1103，触控芯片的第二PLL倍频电路1103连接至触控芯片 112的第二系统时钟1104，实现显示驱动芯片111和触控芯片112之间的完美同步。
本申请另实施例还提供一种触控芯片与触控显示面板的同步电路示意图，参见图11c，触控芯片112用于将时钟信息输出至显示驱动芯片111的第一PLL倍频电路1101，显示驱动芯片111的第一PLL倍频电路1101连接至第二系统时钟1102，实现显示驱动芯片111和触控芯片112之间的完美同步。
本申请实施例的电子设备以多种形式存在，包括但不限于:
(1)移动通信设备:这类设备的特点是具备移动通信功能，并且以提供话音、数据通信为主要目标。这类终端包括:智能手机(例如iPhone)、多媒体手机、功能性手机，以及低端手机等。
(2)超移动个人计算机设备:这类设备属于个人计算机的范畴，有计算和处理功能，一般也具备移动上网特性。这类终端包括:PDA、MID和UMPC设备等，例如iPad。
(3)便携式娱乐设备:这类设备可以显示和播放多媒体内容。该类设备包括:音频、视频播放器(例如iPod)，掌上游戏机，电子书，以及智能玩具和便携式车载导航设备。
(4)服务器:提供计算服务的设备，服务器的构成包括处理器810、硬盘、内存、系统总线等，服务器和通用的计算机架构类似，但是由于需要提供高可靠的服务，因此在处理能力、稳定性、可靠性、安全性、可扩展性、可管理性等方面要求较高。
(5)其他具有数据交互功能的电子装置。
至此，已经对本主题的特定实施例进行了描述。其它实施例在所附权利要求书的范围内。在一些情况下，在权利要求书中记载的动作可以按照不同的顺序来执行并且仍然可以实现期望的结果。另外，在附图中描绘的过程不一定要求示出的特定顺序或者连续顺序，以实现期望的结果。在某些实施方式中，多任务处理和并行处理可以是有利的。
在20世纪90年代，对于一个技术的改进可以很明显地区分是硬件上的改进(例如，对二极管、晶体管、开关等电路结构的改进)还是软件上的改进(对于方法流程的改进)。然而，随着技术的发展，当今的很多方法流程的改进已经可以视为硬件电路结构的直接改进。设计人员几乎都通过将改进的方法流程编程到硬件电路中来得到相应的硬件电路结构。因此，不能说一个方法流程的改进就不能用硬件实体模块来实现。例如，可编程逻辑器件(Programmable Log芯片Dev芯片e,PLD)(例如现场可编程门阵列(Field  Programmable Gate Array，FPGA))就是这样一种集成电路，其逻辑功能由用户对器件编程来确定。由设计人员自行编程来把一个数字系统“集成”在一片PLD上，而不需要请芯片制造厂商来设计和制作专用的集成电路芯片。而且，如今，取代手工地制作集成电路芯片，这种编程也多半改用“逻辑编译器(log芯片compiler)”软件来实现，它与程序开发撰写时所用的软件编译器相类似，而要编译之前的原始代码也得用特定的编程语言来撰写，此称之为硬件描述语言(Hardware Description Language，HDL)，而HDL也并非仅有一种，而是有许多种，如ABEL(Advanced Boolean Expression Language)、AHDL(Altera Hardware Description Language)、Confluence、CUPL(Cornell University Programming Language)、HDCal、JHDL(Java Hardware Description Language)、Lava、Lola、MyHDL、PALASM、RHDL(Ruby Hardware Description Language)等，目前最普遍使用的是VHDL(Very-High-Speed Integrated Circuit Hardware Description Language)与Verilog。本领域技术人员也应该清楚，只需要将方法流程用上述几种硬件描述语言稍作逻辑编程并编程到集成电路中，就可以很容易得到实现该逻辑方法流程的硬件电路。
控制器可以按任何适当的方式实现，例如，控制器可以采取例如微处理器或处理器以及存储可由该(微)处理器执行的计算机可读程序代码(例如软件或固件)的计算机可读介质、逻辑门、开关、专用集成电路(Appl芯片ation Specif芯片Integrated Circuit，AS芯片)、可编程逻辑控制器和嵌入微控制器的形式，控制器的例子包括但不限于以下微控制器：ARC 625D、Atmel AT91SAM、M芯片rochip P芯片18F26K20以及Sil芯片one Labs C8051F320，存储器控制器还可以被实现为存储器的控制逻辑的一部分。本领域技术人员也知道，除了以纯计算机可读程序代码方式实现控制器以外，完全可以通过将方法步骤进行逻辑编程来使得控制器以逻辑门、开关、专用集成电路、可编程逻辑控制器和嵌入微控制器等的形式来实现相同功能。因此这种控制器可以被认为是一种硬件部件，而对其内包括的用于实现各种功能的装置也可以视为硬件部件内的结构。或者甚至，可以将用于实现各种功能的装置视为既可以是实现方法的软件模块又可以是硬件部件内的结构。
上述实施例阐明的系统、装置、模块或单元，具体可以由计算机芯片或实体实现，或者由具有某种功能的产品来实现。一种典型的实现设备为计算机。具体的，计算机例如可以为个人计算机、膝上型计算机、蜂窝电话、相机电话、智能电话、个人数字助理、媒体播放器、导航设备、电子邮件设备、游戏控制台、平板计算机、可穿戴设备或者这些设备中的任何设备的组合。
为了描述的方便，描述以上装置时以功能分为各种单元分别描述。当然，在实施本申请时可以把各单元的功能在同一个或多个软件和/或硬件中实现。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
在一个典型的配置中，计算设备包括一个或多个处理器(CPU)、输入/输出接口、网络接口和内存。
内存可能包括计算机可读介质中的非永久性存储器，随机存取存储器(RAM)和/或非易失性内存等形式，如只读存储器(ROM)或闪存(flash RAM)。内存是计算机可读介质的示例。
计算机可读介质包括永久性和非永久性、可移动和非可移动媒体可以由任何方法或技术来实现信息存储。信息可以是计算机可读指令、数据结构、程序的模块或其他数据。计算机的存储介质的例子包括，但不限于相变内存(PRAM)、静态随机存取存储器(SRAM)、动态随机存取存储器(DRAM)、其他类型的随机存取存储器(RAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、快闪记忆体或其他内存技术、只读光盘只读存储器(CD-ROM)、 数字多功能光盘(DVD)或其他光学存储、磁盒式磁带，磁带磁磁盘存储或其他磁性存储设备或任何其他非传输介质，可用于存储可以被计算设备访问的信息。按照本文中的界定，计算机可读介质不包括暂存电脑可读媒体(transitory media)，如调制的数据信号和载波。
还需要说明的是，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、商品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、商品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括要素的过程、方法、商品或者设备中还存在另外的相同要素。
本领域技术人员应明白，本申请的实施例可提供为方法、系统或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请可以在由计算机执行的计算机可执行指令的一般上下文中描述，例如程序模块。一般地，程序模块包括执行特定事务或实现特定抽象数据类型的例程、程序、对象、组件、数据结构等等。也可以在分布式计算环境中实践本申请，在这些分布式计算环境中，由通过通信网络而被连接的远程处理设备来执行事务。在分布式计算环境中，程序模块可以位于包括存储设备在内的本地和远程计算机存储介质中。
以上仅为本申请的实施例而已，并不用于限制本申请。对于本领域技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原理之内所作的任何修改、等同替换、改进等，均应包含在本申请的权利要求范围之内。

Claims (32)

  1. 一种触控检测方法，其特征在于，包括：
    接收触控显示面板发送的实时同步信号；
    获取触控芯片工作环境中噪声信号的频率；
    根据所述噪声信号的频率，设置打码驱动信号的频率，根据所述打码驱动信号的频率生成打码驱动信号，并输出所述打码驱动信号至所述触控显示面板的驱动电极；
    根据所述实时同步信号，生成选通信号；
    接收所述触控显示面板的感应电极的信号，根据所述选通信号和所述感应电极的信号，输出检测结果。
  2. 根据权利要求1所述的触控检测方法，其特征在于，所述实时同步信号为行实时同步信号。
  3. 根据权利要求2所述的触控检测方法，其特征在于，所述选通信号与所述行实时同步信号频率相同。
  4. 根据权利要求3所述的触控检测方法，其特征在于，所述选通信号的单个高电平区间宽度大于所述行实时同步信号单个高电平区间宽度。
  5. 根据权利要求3所述的触控检测方法，其特征在于，所述行实时同步信号的上升沿位于所述选通信号的选通区间之外。
  6. 根据权利要求1所述的触控检测方法，其特征在于，获取触控芯片工作环境中噪声信号的频率，根据所述噪声信号的频率，设置所述打码驱动信号的频率包括：
    检测所述触控芯片工作环境中各频率的所述噪声信号的强度，将检测到的所述噪声信号的强度中低于预设强度阈值的噪声信号的频率设置为所述打码驱动信号的频率。
  7. 根据权利要求6所述的触控检测方法，其特征在于，进一步包括，
    获取所述触控显示面板的显示驱动操作所引起的噪声信号与所述实时同步信号的相关性；
    根据所述相关性，生成触发信号，所述触发信号用来确定所述实时同步信号中避开所述噪声信号的时间段。
  8. 根据权利要求7所述的触控检测方法，其特征在于，根据所述实时同步 信号，生成选通信号包括：
    根据所述触发信号，在所述实时同步信号中避开所述噪声信号的时间段触发生成所述选通信号。
  9. 根据权利要求7所述的触控检测方法，其特征在于，
    根据所述触发信号，触发生成所述打码驱动信号。
  10. 根据权利要求7所述的触控检测方法，其特征在于，所述相关性包括所述噪声信号相对所述行实时同步信号边沿位置固定且集中。
  11. 根据权利要求1所述的触控检测方法，其特征在于，所述方法还包括：
    对检测获得的所述触控传感器的信号进行放大处理；
    对放大处理后的所述触控传感器的信号进行干扰信号的滤除。
  12. 根据权利要求11所述的触控检测方法，其特征在于，所述方法还包括：
    将所述触控显示面板中触控传感器的有用信号选通连接放大器电路的一输入端，所述放大器电路输出非零电平；
    将所述触控显示面板中触控传感器的噪声信号选通连接所述放大器电路的另一输入端，所述放大器电路的另一输入端连接参考电压，所述放大器电路的输出端为零电平。
  13. 根据权利要求1所述的触控检测方法，其特征在于，所述方法还包括：
    接收所述触控显示面板的时钟信息，所述时钟信息用于同步所述选通信号和所述实时同步信号。
  14. 根据权利要求1所述的触控检测方法，其特征在于，所述方法还包括：输出时钟信息至所述触控显示面板，所述时钟信息用于同步所述选通信号和所述实时同步信号。
  15. 根据权利要求1所述的触控检测方法，其特征在于，所述方法还包括：接收所述触控显示面板和所述触控芯片外部的时钟信息，所述时钟信息用于同步所述选通信号和所述实时同步信号。
  16. 一种触控检测电路，其特征在于，包括：
    同步信号控制器，用于接收触控显示面板发送的实时同步信号，以及获取触控芯片工作环境中噪声信号的频率；
    打码信号产生器，用于根据所述噪声信号的频率，设置所述打码驱动信号的频率，根据所述打码驱动信号的频率生成打码驱动信号，并输出所述打码驱动信号至所述触控显示面板的驱动电极；
    信号检测选通器，用于根据所述实时同步信号，生成选通信号，以及接收 所述触控显示面板的感应电极的信号，根据所述选通信号和所述感应电极的信号，输出检测结果。
  17. 根据权利要求16所述的触控检测电路，其特征在于，
    所述实时同步信号为行实时同步信号。
  18. 根据权利要求17所述的触控检测方法，其特征在于，所述选通信号与所述行实时同步信号频率相同。
  19. 根据权利要求18所述的触控检测方法，其特征在于，所述选通信号的单个高电平区间宽度大于所述行实时同步信号单个高电平区间宽度。
  20. 根据权利要求18所述的触控检测方法，其特征在于，所述行实时同步信号的上升沿位于所述选通信号的选通区间之外。
  21. 根据权利要求16所述的触控检测电路，其特征在于，所述同步信号控制器还用于，
    检测所述触控芯片工作环境中各频率的所述噪声信号的强度，将检测到的所述噪声信号的强度中低于预设强度阈值的噪声信号的频率设置为所述打码驱动信号的频率。
  22. 根据权利要求21所述的触控检测电路，其特征在于，所述同步信号控制器包括：
    相关性获得单元，用于获得所述触控显示面板的显示驱动操作所引起的噪声信号与所述实时同步信号的相关性；
    信号生成单元，用于根据所述相关性，生成触发信号，所述触发信号用来确定所述实时同步信号中避开所述噪声信号的时间段。
  23. 根据权利要求22所述的触控检测电路，其特征在于，
    所述信号检测选通器还用于，
    根据所述触发信号，在所述实时同步信号中避开所述噪声信号的时间段触发生成所述选通信号。
  24. 根据权利要求22所述的触控检测电路，其特征在于，
    所述相关性包括所述噪声信号相对所述行实时同步信号边沿位置固定且集中。
  25. 根据权利要求16所述的触控检测电路，其特征在于，所述电路还包括：
    放大器，用于对检测获得的所述触控传感器的信号进行放大处理；
    低通抗混叠滤波器，用于对放大处理后的所述触控传感器的信号进行干扰信号的滤除。
  26. 根据权利要求25所述的触控检测电路，其特征在于，所述信号检测选通器还用于，
    将所述触控显示面板中电将所述触控显示面板中触控传感器的有用信号选通连接所述放大器电路的一输入端，所述放大器电路输出非零电平；
    将所述触控显示面板中触控传感器的噪声信号选通连接所述放大器电路的另一输入端，所述放大器电路的另一输入端连接参考电压，所述放大器电路的输出端为零电平。
  27. 一种触控芯片，其特征在于，包括：如权利要求16-26中任意一项所述的触控检测电路。
  28. 一种电子设备，其特征在于，包括：如权利要求27所述的触控芯片和触控显示面板，所述触控芯片还包括第二PLL倍频电路，所述触控显示面板包括第一PLL倍频电路。
  29. 根据权利要求28所述的电子设备，其特征在于，所述电子设备还包括：有源时钟，所述有源时钟用于连接所述触控显示面板的第一PLL倍频电路以及所述触控芯片的第二PLL倍频电路。
  30. 根据权利要求29所述的电子设备，其特征在于，所述有源时钟为晶振。
  31. 根据权利要求28所述的电子设备，其特征在于，所述触控芯片还包括时钟，所述触控芯片将时钟信息输出至所述触控显示面板的第一PLL倍频电路。
  32. 根据权利要求28所述的电子设备，其特征在于，所述触控显示面板还包括时钟，所述触控显示面板将时钟信息输出至所述触控芯片的第二PLL倍频电路。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114610175A (zh) * 2022-03-07 2022-06-10 昆山国显光电有限公司 触控显示面板的驱动方法、触控驱动芯片及触控显示装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210123454A (ko) * 2020-04-02 2021-10-14 삼성디스플레이 주식회사 입력 감지 장치 및 이를 포함하는 표시 장치
KR20230067740A (ko) * 2021-11-08 2023-05-17 삼성디스플레이 주식회사 표시 장치
CN114925014B (zh) * 2022-05-24 2024-03-26 深圳市爱协生科技股份有限公司 一种自适应抗强电干扰的电容触摸串口屏

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103353816A (zh) * 2013-06-14 2013-10-16 旭曜科技股份有限公司 一种内嵌式多点触控面板系统及其驱动方法
CN103376961A (zh) * 2012-04-27 2013-10-30 联咏科技股份有限公司 触控装置以及其触控检测方法
CN104317446A (zh) * 2014-10-15 2015-01-28 京东方科技集团股份有限公司 显示装置及其驱动方法
US20170131823A1 (en) * 2015-11-09 2017-05-11 Stmicroelectronics Asia Pacific Pte Ltd Suppression of display noise in touch screen controllers
CN108345410A (zh) * 2018-01-31 2018-07-31 北京集创北方科技股份有限公司 用于触控显示装置的驱动方法和触控显示装置
CN109324717A (zh) * 2018-11-14 2019-02-12 友达光电股份有限公司 触控显示装置和触控驱动方法

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2006043660A1 (ja) * 2004-10-22 2008-05-22 シャープ株式会社 タッチセンサ付き表示装置およびその駆動方法
US8493331B2 (en) * 2007-06-13 2013-07-23 Apple Inc. Touch detection using multiple simultaneous frequencies
TW200949632A (en) * 2008-05-22 2009-12-01 Prospect Technology Corp A trigger-threshold adaptable and auto-adjustable capacitive induction-type keying device
US9489072B2 (en) * 2010-04-15 2016-11-08 Atmel Corporation Noise reduction in capacitive touch sensors
KR101394937B1 (ko) * 2010-09-07 2014-05-15 엘지디스플레이 주식회사 터치 센서를 갖는 표시 장치 및 그 방법
CN105320319A (zh) * 2014-06-30 2016-02-10 晨星半导体股份有限公司 触控式电子系统的触控装置及控制方法
KR101630047B1 (ko) * 2014-07-08 2016-06-14 한양대학교 산학협력단 정전용량형 터치 패널 장치 및 구동방법
WO2016143880A1 (ja) * 2015-03-11 2016-09-15 シャープ株式会社 タッチパネル付き表示装置
KR102375274B1 (ko) * 2015-09-10 2022-03-18 삼성디스플레이 주식회사 터치 감지 장치 및 이를 포함하는 표시 장치
KR102476212B1 (ko) * 2015-11-23 2022-12-13 삼성디스플레이 주식회사 터치 스크린 일체형 표시장치
KR102533513B1 (ko) * 2016-06-30 2023-05-18 엘지디스플레이 주식회사 터치 센서의 구동 방법 및 회로와 이를 이용한 표시장치
WO2019023923A1 (zh) * 2017-08-01 2019-02-07 深圳市汇顶科技股份有限公司 确定触摸位置的方法和触摸控制芯片
CN107636583B (zh) * 2017-08-01 2021-05-11 深圳市汇顶科技股份有限公司 确定触摸位置的方法和触摸控制芯片
CN110383219B (zh) * 2018-02-14 2023-06-16 深圳市为通博科技有限责任公司 触摸控制器、触控显示系统及触控显示同步方法
KR20200104470A (ko) * 2019-02-26 2020-09-04 삼성전자주식회사 터치 센싱 패널의 노이즈 보상 장치, 방법 및 노이즈 회피 장치, 방법
JP7373755B2 (ja) * 2019-03-20 2023-11-06 パナソニックＩｐマネジメント株式会社 表示システム、制御装置および制御方法
JP7398660B2 (ja) * 2019-08-07 2023-12-15 パナソニックＩｐマネジメント株式会社 表示システム、制御装置および制御方法
KR102057050B1 (ko) * 2019-08-08 2019-12-18 주식회사 에이코닉 터치 센서를 구비한 표시 장치
US10838547B1 (en) * 2019-10-16 2020-11-17 Synaptics Incorporated Display noise filter for a sensing device
KR20210081584A (ko) * 2019-12-24 2021-07-02 주식회사 실리콘웍스 노이즈를 회피하는 터치센싱장치 및 이를 포함하는 표시장치

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103376961A (zh) * 2012-04-27 2013-10-30 联咏科技股份有限公司 触控装置以及其触控检测方法
CN103353816A (zh) * 2013-06-14 2013-10-16 旭曜科技股份有限公司 一种内嵌式多点触控面板系统及其驱动方法
CN104317446A (zh) * 2014-10-15 2015-01-28 京东方科技集团股份有限公司 显示装置及其驱动方法
US20170131823A1 (en) * 2015-11-09 2017-05-11 Stmicroelectronics Asia Pacific Pte Ltd Suppression of display noise in touch screen controllers
CN108345410A (zh) * 2018-01-31 2018-07-31 北京集创北方科技股份有限公司 用于触控显示装置的驱动方法和触控显示装置
CN109324717A (zh) * 2018-11-14 2019-02-12 友达光电股份有限公司 触控显示装置和触控驱动方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114610175A (zh) * 2022-03-07 2022-06-10 昆山国显光电有限公司 触控显示面板的驱动方法、触控驱动芯片及触控显示装置
CN114610175B (zh) * 2022-03-07 2024-02-13 昆山国显光电有限公司 触控显示面板的驱动方法、触控驱动芯片及触控显示装置

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