Solid state image pickup apparatus with charge storage device

Details Solid state image pickup apparatus with charge storage device Solid state image pickup apparatus with charge storage device

Filed on

1989-01-31

Date issued

1990-07-31

Examiner

Brinich, Stephen

Patent Class

Facsimile and static presentation processing

SubClass

Facsimile

SubSubClass

Recording apparatus

Other Related Categories

35821331, H04N 314

Type

Patent

Status

active

Patent number

049454188

Description

ABSTRACT:
A solid state image pickup device is provided in which a photodiode photoelectrically converts incident light to a voltage. Next a transistor performs voltage-to-current conversion, and a capacitor stores the charge. Current is stored in the capacitor without requiring the application of a reverse bias voltage to the photodiode. The voltage generated across the photodiode is logarithmically related to the quantity of incident light, and the dynamic range of the input signal to be reproduced is increased. As a result, dark current is minimized and dark current noise is reduced.

REFERENCES:
patent: 4363963 (1982-12-01), Ando
patent: 4382187 (1983-05-01), Fraleux et al.
patent: 4471228 (1984-09-01), Nishizawa et al.
patent: 4472638 (1984-09-01), Nishizawa et al.
patent: 4499384 (1985-02-01), Segawa
patent: 4518863 (1985-05-01), Fukuoka et al.
patent: 4542409 (1985-09-01), Ochi

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