Display Panel Timing Shift for Accurate Fingerprint Sensing

The patent applies dynamics by making the start signal timing variable rather than fixed. The controller dynamically adjusts the start signal timing based on whether the frame period is an even or odd number, shifting the timing by one horizontal period for odd frames. This dynamic timing adjustment optimizes the sensing window for light-sensing pixels to accurately capture fingerprint images while maintaining manageable system complexity through pattern-based control.

The patent implements periodic action by applying clock signal shifts in a regular alternating pattern - even frame periods use normal timing while odd frame periods shift the clock signal by one horizontal period. This periodic approach ensures that fingerprint sensing occurs at optimal timing intervals while maintaining predictable synchronization patterns that the controller can manage through simple even/odd frame detection.

The patent applies preliminary action by adjusting the timing of the start signal and clock signal before the actual sensing operation begins. By shifting the clock signal timing by one horizontal period for odd frames, the sensing window is optimally positioned to capture fingerprint images while minimizing exposure to noise sources, thereby improving signal quality before noise can significantly degrade the measurement.