Inverted driving technique for removing display noise in capacitive touch sensors

IEICE Electronics Express

Jae Young Park¹  Jong Kang Park¹  Chang-Ju Lee¹  Jong Tae Kim¹ 

[1] College of Information and Communication Engineering, Sungkyunkwan University

关键词: display noise;    capacitive touch;    inverted TX driving;   

DOI  :  10.1587/elex.12.20150683

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(10)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.

【 授权许可】

Unknown