Solid-state image pickup device used as a photoelectric...

Details Solid-state image pickup device used as a photoelectric... Solid-state image pickup device used as a photoelectric...

2006-06-27

2006-06-27

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C348S310000

Reexamination Certificate

active

07067785

ABSTRACT:
It is an object of the present invention to provide a solid-state image pickup device capable of preventing any output variation due to a threshold voltage variation, and preventing a dynamic range from being narrowed in conjunction with deterioration in outputs due to a lowered threshold voltage. The present invention provides improvements in type and connection of a reset transistor, a select transistor, and an amplifier transistor to achieve the above object. Specifically, the present invention provides a solid-state image pickup device comprising a first MOS transistor serving as a reset switch, a second MOS transistor serving as a select switch, a photodiode, and a third MOS transistor having a source connected in series with the photodiode. In this solid-state image pickup device, the first and second MOS transistors are connected in series with one another between a voltage source and an output end, and the photodiode and the third MOS transistor are connected in series with one another between a voltage source and a ground. Further, the connection point between the first and second MOS transistors is connected to the gate of the third MOS transistor.

REFERENCES:
patent: 5900623 (1999-05-01), Tsang et al.
patent: 6111245 (2000-08-01), Wu et al.
patent: 6831691 (2004-12-01), Takada et al.
patent: 05-048844 (1993-02-01), None
patent: 09-232555 (1997-09-01), None
patent: 2001-238133 (2001-08-01), None

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