Semiconductor image pickup device with dual current...

Details Semiconductor image pickup device with dual current... Semiconductor image pickup device with dual current...

2004-10-29

2008-10-14

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC

Reexamination Certificate

active

07435935

ABSTRACT:
A semiconductor image pickup device's pixel circuits each include a photodetection element, and first and second current mirror circuits provided as current generation circuit. The photodetection element generates at a node a photocurrent corresponding to a quantity of light received. The first current mirror circuit passes first and second currents corresponding to the photocurrent to an internal node and an output node, respectively. The second current mirror circuit is connected to generate a fourth current corresponding to a third current passing through the internal node and also allow a differential current between the second and fourth currents to flow through the output node. Each pixel circuit has its internal node electrically connected by a resistance component, which implements an inter-pixel connect, to the internal node of at least one of adjacent pixel circuits. An output current will be a current corresponding to a relative difference between the photocurrent of the pixel circuit of interest and the third current corresponding to an average quantity of light received at adjacent pixels. Thus a high precision, miniaturized semiconductor image pickup device can be provided that can detect bright and dark portions in sufficient contrast even if there is a large brightness distribution within a single field of view.

REFERENCES:
patent: 5481118 (1996-01-01), Tew
patent: 6323479 (2001-11-01), Hynecek et al.
patent: 7139024 (2006-11-01), Lu et al.
patent: 2000-340779 (2000-12-01), None
patent: WO 02/059979 (2002-08-01), None
Taiwanese Office Action dated Aug. 30, 2005 for Appln. No. 093131581, inventor Fusayoshi Hirotsu.
Takada, K. et al., “Chapter 3: Logarithmic Transformation CMOS Image Sensor Technology and Application in Minolta/ROHM inCCD/CMOS Image Sensor Technology”, TRICEPS, pp. 107-117, (Jul. 2000).

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