横型オーバフロー蓄積と電流読出し動作を組合せたダイナミックレンジ200dB超のCMOSイメージセンサ(<小特集>イメージセンシング技術とその応用)

概要

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A wide dynamic range 64×64 CMOS image sensor with 20×20μm^2 pixel that combines a lateral-overflow integration voltage-readout operation with the current readout operation from the buried photo-diode has been developed. In the voltage readout operation, an over 160-dB dynamic range image with a linear response is obtained from sequential electronic shutter operations from 1/30s to 1/130ks with a dynamic range of about 100-dB within a light intensity range from about 10^<-2>lx to 10^6lx. In addition, an over 200-dB dynamic range performance of up to 10^8lx or more with few time exposures in the high illuminance region is made possible by combining it with the current reading operation. More than 40 dB for all noises, including photon shot noise, occurs around all the switching points.
社団法人映像情報メディア学会の論文
2007-03-01