Touch Sensing Method for Ultrathin AMOLED Panels

The patent applies preliminary action by performing an induction driving period before the actual sensing operation. During this induction period, the system pre-charges the parasitic capacitance between the sensing electrode and upper electrode, establishing a baseline voltage state. This preliminary charging action enables the subsequent sensing period to accurately detect touch-induced voltage changes despite the ultrathin panel structure, resolving the contradiction between reduced thickness and maintained induction performance.

The patent employs parameter changes by dynamically adjusting system parameters including induction time duration, driving voltages (first voltage during induction, second voltage during sensing), and threshold values. These parameter adjustments optimize the voltage differential detection capability in ultrathin panels, allowing the system to maintain measurement precision while operating at reduced thickness levels below 100 micrometers.

The patent implements periodic action by dividing the touch sensing operation into distinct time periods: an induction driving period for pre-charging parasitic capacitance, followed by a sensing period for actual touch detection. This periodic structure allows the system to achieve accurate touch detection through voltage differential measurement between periods, rather than requiring continuously extended induction times, thus maintaining both precision and response speed.

The patent ensures continuity of useful action by overlapping the induction driving period with the display refresh cycle and by continuously monitoring voltage differentials during the sensing period. This continuous monitoring approach allows the system to detect touch events as they occur without requiring long idle induction periods, maintaining high productivity while ensuring accurate detection through sustained voltage measurement.