Electronic device including touch-sensitive display and method of detecting noise

摘要

An electronic device includes a touch-sensitive display that includes drive electrodes and sense electrodes configured to detect touches on the touch-sensitive display, a noise-detection electrode spaced from the drive electrodes and the sense electrodes, at least one controller operably coupled to the drive electrodes, the sense electrodes, and the noise-detection electrode and configured to detect touches on the touch-sensitive display utilizing the drive electrodes and the sense electrodes, and detect noise utilizing the noise-detection electrode during touch detection.

主权项

1. An electronic device comprising:
a touch-sensitive display comprising:
drive electrodes generally extending in a first direction and sense electrodes generally extending in a second direction and spaced from the drive electrodes such that the sense electrodes cross the drive electrodes to detect touches on the touch-sensitive display;a noise-detection electrode spaced from the drive electrodes and the sense electrodes, the noise-detection electrode extending around a perimeter of the drive electrodes and the sense electrodes and including a side extending in the first direction and a side extending in the second direction such that the noise-detection electrode includes sides that extend generally parallel with sides of the touch-sensitive display;at least one controller operably coupled to the drive electrodes, the sense electrodes, and the noise-detection electrode and configured to:
perform first touch detection on the touch-sensitive display by driving each of the drive electrodes with a first number of pulses and sensing utilizing the sense electrodes; anddetect first noise utilizing the noise-detection electrode during the first touch detection;in response to detecting a noisy condition by determining that the first noise meets a threshold noise value:
perform second touch detection on the touch-sensitive display by driving each of the drive electrodes with a second number pulses that is greater than the first number of pulses and sensing utilizing the sense electrodes;detect second noise utilizing the noise-detection electrode during second touch detection; andin response to determining that the second noise does not meet the threshold noise value, repeat first touch detection by driving each of the drive electrodes with the first number of pulses.