Touch based interactivity has become an important function in displays. This paper reports on the signal processing of touch signals in which touch interactivity is processed as an image and correlated double sampling (CDS) algorithm is applied for both common-mode noise reduction and global multi-valued offset cancellation. Based on experimental results, we achieved a boost in SNR of 7.6dB. The processed signal reduces detection errors and power consumption of the system.

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This paper reports on a low-pass spatial filtering technique for reduction of noise spikes in capacitive touch screen panels. Filter bandwidth is adjusted by dynamically evaluating attenuation of signal and noise spikes. Based on the experimental results, we boost the signal-to-noise ratio by 15.6 dB and attenuate noise spikes by 19.25 dB. The processed signal yields higher detection accuracy and lower power consumption.