Dynamic range extension of an active pixel sensor by combining output signals from photodiodes with different sensitivities

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Abstract

A dynamic range (DR) extension technique based on a 3-transistor (3-Tr.) active pixel sensor (APS) and dual image sampling has been proposed. The feature of the proposed APS was that the APS used two photodiodes with different sensitivities, a high-sensitivity photodiode and a low-sensitivity photodiode. Operation of the proposed APS was simulated by using a 128×128 pixel array. Compared with previously proposed wide DR (WDR) APS, the proposed approach has several advantages; no-external equipments or signal processing for combining images, no-additional timerequirement for additional charge accumulation, adjustable DR extension and no temporal disparity.

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