Solid state image pickup element and camera system

Details Solid state image pickup element and camera system Solid state image pickup element and camera system

2011-01-25

2011-01-25

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C250S2140AG, C341S155000

Reexamination Certificate

active

07875842

ABSTRACT:
A solid state image pickup element includes a pixel unit having a plurality of pixels for photoelectric conversion disposed in a matrix shape and a pixel signal read circuit for reading pixel signals in the unit of a plurality of pixels from the pixel unit. The pixel signal read circuit includes a plurality of comparators disposed in correspondence with a pixel column layout for performing comparison judgment between a read signal potential and a reference voltage and outputting a judgment signal and a plurality of counters each for counting a comparison time of a corresponding one of the comparators, an operation being controlled by an output from a corresponding one of the comparators. The comparators include a first amplifier for performing a comparison operation between the reference voltage and the read signal potential and inverting an output at a predetermined comparison point, a second amplifier for forming a current path when an output of the first amplifier is inverted, to output an output of the first amplifier by gain up, and a current control circuit for shutting the current path of the second amplifier when an output level of the second amplifier exceeds a predetermined threshold level.

REFERENCES:
patent: 7683307 (2010-03-01), Kawaguchi et al.
patent: 2005/0195304 (2005-09-01), Nitta et al.
patent: 2009/0128653 (2009-05-01), Tanaka
patent: 08-078975 (1996-03-01), None
patent: 2005-278135 (2005-10-01), None
patent: 2007-019682 (2007-01-01), None
Yang et al., “An Integrated 800×600 CMOS Image Systems”, ISSCC Digest of Technical Papers, pp. 304-305, Feb. 1999.

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