A Reconfigurable Multimode Readout IC for Nonconductive and Capacitive Sensing With 33.9-dB SNR on 6.5-in AMOLED Panels

Abstract

This letter presents a multimode readout IC for 6.5-in 34Tx/16Rx on-cell touch AMOLED (OCTA) panels, detecting both conductive and nonconductive objects (NCos) without panel modifications. To enable this dual detection, a reconfigurable analog front-end (AFE) is proposed, functioning as either a capacitance-to-voltage converter or a triboelectric charge sampler. In display-off mode, the IC operates in low-power triboelectric sensing at 9.7 mW, utilizing a temporal-to-spatial mapping algorithm to recognize tribo-charge gestures at 30 Hz. Upon detection, it transitions to a high-accuracy capacitive mode synchronized to 120-Hz VSYNC, consuming 23.7 mW. Measurements show a 33.9-dB maximum SNR for a rubber object at handwriting speeds (10–30 mm/s) and a $2340\times 1080$ coordinate resolution. This work enables highly integrated multimode sensing for commercial AMOLEDs.