Image sensor providing improved image quality

Details Image sensor providing improved image quality Image sensor providing improved image quality

2007-01-30

2007-01-30

Srivastava, Vivek (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S221100, C348S222100, C250S208100, C250S2140RC

Reexamination Certificate

active

10618851

ABSTRACT:
An image sensor for capturing image, has: a plurality of pixels arranged in a matrix each including a photoelectric conversion element for generating current according to received light intensity and a reset transistor for resetting a node of the photoelectric conversion element to a reset potential; and a sample hold circuit for sample holding a pixel potential according to the potential of the node of the pixel. And the sample hold circuit outputs the differential potential, between a first pixel potential at an end of the integration period after a first reset operation of the pixel and a second pixel potential at an end of a reset noise read period after a second reset operation after the integration period, as a pixel signal. Also in the sample hold circuit, when the second pixel potential during the reset noise read period exceeds a predetermined threshold level, the second pixel potential is set to a predetermined reference potential.

REFERENCES:
patent: 6423957 (2002-07-01), Kim et al.
patent: 6667768 (2003-12-01), Fossum
patent: 6803958 (2004-10-01), Wang
patent: 2002/0118289 (2002-08-01), Choi
patent: 2002-218324 (2002-02-01), None

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