Reduction of Noise Spikes in Touch Screen Systems by Low Pass Spatial Filtering
Shuo Gao, David I. McLean, Jackson Lai, Charles Micou, Arokia Nathan · Journal of Display Technology · 2016
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.