P‐178: Design of On‐Panel Readout Circuit for Touch Panel Application

Abstract

An on-panel readout circuit for touch panel application has been designed and fabricated in a 3-μm low temperature poly-silicon (LTPS) technology. The minimum detectable voltage difference of the proposed circuit is 30 mV. The switch-capacitor technique is applied to amplify the voltage difference from capacitance change due to touch panel. The corrected double-sampling (CDS) technique is also employed to reduce the offset originated from process variation.

Design and Implementation of Readout Circuit with Threshold Voltage Compensation on Glass Substrate for Touch Panel Applications

“…3,4) In ref. 5, one on-panel readout circuit for touch panel application has been proposed with minimum detectable voltage difference of the proposed circuit is 30 mV. The switch-capacitor (SC) technique is applied to enlarge the voltage difference from the capacitance change of touch panel and the corrected double-sampling (CDS) technique is also employed to reduce the offset owing to process variation.…”