Back to results
US 9,310,931 B2Granted
Dynamic cross-talk mitigation for integrated touch screens
AssigneeApple Inc.
InventorsMarduke Yousefpor, Christoph Horst Krah, Kevin J. White
Life of this patent
Estimating the term…
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.
Claims25
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.
8 more elements
A touch input device configured to reduce the effects of noise, the touch input device comprising:
- 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.
10 more elements
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:
- 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.
8 more elements
A touch input device configured to reduce the effects of noise, the touch input device comprising:
- 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.
7 more elements
Dependencies are inferred from the claim text.