Inverted driving technique for removing display noise in capacitive touch sensors
Jae Young Park, Jong Kang Park, Chang‐Ju Lee, Jong Tae Kim · IEICE Electronics Express · 2015
As the technological advances in mobile display is focusing on thinner and wider structures, capacitive touch recognition suffers from ever-increasing display noise. Realizing reliable touch recognition in thin displays requires a way to remove display noise. We observed that display noise is evident in various patterns and amplitudes according to the display image. In order to remove noise, we applied non-inverse signals and inverse signals across two data frames, in accordance with the periodicity of the noise. With all other conditions remaining the same, the proposed method showed higher signal-to-noise ratio (SNR) for all display noise patterns compared to existing methods. The proposed method showed a SNR that was averagely 5.39 dB higher than the SNR of the existing method. The results shows that the display noise was removed effectively.