A BSI Global Shutter Pixel with Background Light Suppression for Multi-Frame Differential Imaging

Abstract

A BSI compatible global shutter pixel with the feature of background light suppression has been developed for differential imaging applications. The proposed pixel scheme features in-pixel consecutive multiple frame subtraction and accumulation. This yields a good immunity to background light, thus enhancing the contrast and detection probability for differential images while eliminating the need for off-chip data buffer or storage. In this paper, the signal behavior and noise performance have also been analyzed with an extracted pixel model. The calculated SNR shows an increasing tendency with the use of the proposed in-pixel computing scheme.