Sensor Reset Circuit for Afterimage Reduction

The patent applies preliminary action by performing an additional reset operation after the main reset cycle. Specifically, after the normal reset voltage application, the patent applies reset voltage again during a period when the sensor element is not actively detecting signals, ensuring that any remaining charge in the charge storage section is completely cleared before the next detection cycle begins, thus preventing afterimages

The patent ensures continuity of useful action by extending the reset voltage application beyond the traditional single-cycle approach. The reset operation continues into the subsequent horizontal scan period, maintaining the reset function continuously until charge completion is achieved, thereby eliminating residual charge that would cause afterimages

The patent implements periodic action by applying the reset voltage in periodic cycles rather than continuously. The reset voltage is applied during specific time windows (exceeding one horizontal scan period) and then paused, creating a periodic pattern that reliably clears charge while avoiding the need for continuous complex control circuitry

The patent applies self-service by utilizing the existing reset transistor and voltage supply infrastructure already present in the sensor device. The additional reset operation leverages these existing components without requiring new dedicated hardware, thereby achieving improved reliability while minimizing increases in device complexity