Wide dynamic range image sensor

Details Wide dynamic range image sensor Wide dynamic range image sensor

2008-06-07

2010-06-29

Lee, John R (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S297000, C348S308000

Reexamination Certificate

active

07745774

ABSTRACT:
An exemplary image sensor comprises a photodetector proximate to a pixel site, and a light meter proximate to the pixel site configured to approximate an initial charge acquired by the photodetector at the end of a first integration period of a frame exposure period. A reset circuit resets the photodetector if the approximated initial charge acquired by the photodetector exceeds a threshold. A readout circuit detects a final charge acquired by the photodetector at the end of a second integration period of the frame exposure period. If the photodetector was reset, the readout circuit adjusts the final exposure to account for exposure prior to the photodetector having been reset.

REFERENCES:
patent: 6130713 (2000-10-01), Merrill
patent: 7411169 (2008-08-01), Mann
patent: 2003/0058356 (2003-03-01), DiCarlo et al.
patent: 2005/0128327 (2005-06-01), Bencuya et al.

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