Light sensor circuit having source/drain voltage...

Details Light sensor circuit having source/drain voltage... Light sensor circuit having source/drain voltage...

2002-03-01

2009-02-03

Vu, Ngoc-Yen T (Department: 2622)

Television

Camera, system and detail

Solid-state image sensor

C250S2140LS, C250S214100, C348S294000

Reexamination Certificate

active

07486322

ABSTRACT:
Disclosed is a light sensor circuit which works by producing in a photoelectric converting element a photo current proportional to a quantity of incident light falling thereon, converting the photo current into a voltage signal by using a threshold region characteristic of a transistor with a logarithmic output characteristic in a weak inverse state and producing a sensor output corresponding to the voltage signal. The light sensor circuit is provided with an initializing means for removing an electric charge remaining in a parasite capacitor of the photoelectric converting element before detecting light by the same element, thereby achieving a wide dynamic range and obtaining a sensor signal with no afterglow even if it works with a small quantity of incident light.

REFERENCES:
patent: 5241575 (1993-08-01), Miyatake et al.
patent: 6967682 (2005-11-01), Hagihara
patent: 6999122 (2006-02-01), Hagihara et al.
patent: 7030921 (2006-04-01), Hagihara et al.
patent: 7164443 (2007-01-01), Hagihara
patent: 7176435 (2007-02-01), Shinotsuka et al.
patent: 5-219443 (1993-08-01), None
patent: 7-46481 (1995-02-01), None
patent: 2000-329616 (2000-11-01), None
patent: 2000329616 (2000-11-01), None
Japanese Journal of Institute of TV Engineers, vol. 49 1995) entitled “Logarithmic-Converting CCD Line Sensor”.

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