Optical sensor and method of selection of pixel of optical...

Details Optical sensor and method of selection of pixel of optical... Optical sensor and method of selection of pixel of optical...

2008-11-06

2010-02-16

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC

Reexamination Certificate

active

07663085

ABSTRACT:
An optical sensor able to make a pixel area small without degrading an increase of the speed of detection of the change of light intensity and reduction of the power consumption, therefore able reduce the size of a chip at the time of an increase of pixels and a method of selection of pixels of the same, imparting a function of holding charges corresponding to a light reception intensity of a previous frame and a function for comparing strongness/weakness of the light reception intensity of the previous frame and the light reception intensity of the current frame to each of the pixels composing a pixel array part and configuring both function portions by a capacitor Cs connected between a photodiode PD and a selection transistor T2.

REFERENCES:
patent: 5850471 (1998-12-01), Brett
patent: 7030924 (2006-04-01), Hatase et al.
patent: 2002/0163491 (2002-11-01), Yoshimura et al.
patent: 11-284911 (1999-10-01), None
patent: 2003-304451 (2003-10-01), None

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