Dynamic cross-talk mitigation for integrated touch screens
First Claim
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1. A method of dynamically reducing the effect of noise on a touch sensor panel, the method comprising:
- performing a first scan of the touch sensor panel comprising;
driving a drive electrode, sensing a corresponding sense electrode and demodulating a sense signal corresponding to the sense electrode with a demodulation signal;
while driving the drive electrode and sensing the sense electrode, dithering a parameter of a circuit element proximal to the touch sensor panel; and
after dithering the parameter, adjusting a phase of the demodulation signal for demodulating the sense signal; and
after the first scan, performing a second scan of the touch sensor panel comprising;
driving the drive electrode, sensing the corresponding sense electrode and demodulating the sense signal with the demodulation signal;
while driving the drive electrode and sensing the sense electrode, dithering the parameter of the circuit element proximal to the touch sensor panel; and
after dithering the parameter, maintaining the phase of the demodulation signal for demodulating the sense signal.
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Abstract
A touch input device configured to mitigate the effects of dynamic cross talk noise is provided. The touch input device can dither an effective resistance of a plurality of gate lines proximal to the touch sensor panel in order to determine if a phase of a touch signal demodulator needs to be adjusted.
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Citations
25 Claims
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1. A method of dynamically reducing the effect of noise on a touch sensor panel, the method comprising:
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performing a first scan of the touch sensor panel comprising; driving a drive electrode, sensing a corresponding sense electrode and demodulating a sense signal corresponding to the sense electrode with a demodulation signal; while driving the drive electrode and sensing the sense electrode, dithering a parameter of a circuit element proximal to the touch sensor panel; and after dithering the parameter, adjusting a phase of the demodulation signal for demodulating the sense signal; and after the first scan, performing a second scan of the touch sensor panel comprising; driving the drive electrode, sensing the corresponding sense electrode and demodulating the sense signal with the demodulation signal; while driving the drive electrode and sensing the sense electrode, dithering the parameter of the circuit element proximal to the touch sensor panel; and after dithering the parameter, maintaining the phase of the demodulation signal for demodulating the sense signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A touch input device configured to reduce the effects of noise, the touch input device comprising:
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a touch sensor panel; a processor capable of; performing a first scan of the touch sensor panel comprising; driving a drive electrode, sensing a corresponding sense electrode and demodulating a sense signal corresponding to the sense electrode with a demodulation signal; while driving the drive electrode and sensing the sense electrode, dithering a parameter of a circuit element proximal to the touch sensor panel; and after dithering the parameter, adjusting a phase of the demodulation signal for demodulating the sense signal; and after the first scan, performing a second scan of the touch sensor panel comprising; driving the drive electrode, sensing the sense electrode and demodulating the sense signal with the demodulation signal; while driving the drive electrode and sensing the sense electrode, dithering the parameter of the circuit element proximal to the touch sensor panel; and after dithering the parameter, maintaining the phase of the demodulation signal for demodulating the sense signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory computer readable storage medium having stored thereon a set of instructions for reducing the effects of noise in a touch sensor panel, that when executed by a processor causes the processor to:
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perform a first scan of the touch sensor panel comprising; driving a drive electrode, sensing a corresponding sense electrode and demodulating a sense signal corresponding to the sense electrode with a demodulation signal; while driving the drive electrode and sensing the sense electrode, dithering a parameter of a circuit element proximal to the touch sensor panel; and after dithering the parameter, adjusting a phase of the demodulation signal for demodulating the sense signal; and after the first scan, perform a second scan of the touch sensor panel comprising; driving the drive electrode, sensing the sense electrode and demodulating the sense signal with the demodulation signal; while driving the drive electrode and sensing the sense electrode, dithering the parameter of the circuit element proximal to the touch sensor panel; and after dithering the parameter, maintaining the phase of the demodulation signal for demodulating the sense signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A touch input device configured to reduce the effects of noise, the touch input device comprising:
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a touch sensor panel; and a processor capable of; measuring a detected touch signal on the touch sensor panel; while measuring the detected touch signal, dithering a parameter of a circuit element proximal to the touch sensor panel; measuring a change in the detected touch signal caused by the dithering, the measurement including demodulating the detected touch signal using a demodulation signal having a demodulation phase; comparing the change in the detected touch signal caused by the dithering to a pre-determined threshold; in accordance with a determination that the change in the detected touch signal caused by the dithering is above the pre-determined threshold, adjusting the demodulation phase of the demodulation signal for demodulating the detected touch signal; and in accordance with a determination that the change in the detected touch signal caused by the dithering is below the pre-determined threshold, maintaining the demodulation phase of the demodulation signal for demodulating the detected touch signal.
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Specification