Image sensor with a voltage switching circuit for low afterglow

Details Image sensor with a voltage switching circuit for low afterglow Image sensor with a voltage switching circuit for low afterglow

2007-02-13

2007-02-13

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C348S308000

Reexamination Certificate

active

09848471

ABSTRACT:
Disclosed is an image sensor consisting of light sensor circuits arranged to form an array of pixels, each of which produces in a photoelectric converting element a sensor current proportional to the quantity of light falling thereon and converts the sensor current into a voltage signal by a MOS type transistor with a logarithmic output characteristic in a weak inverse state, wherein a means for changing over a drain voltage of the transistor for each light sensor circuit to a value lower than a normal value for a specified time to remove a charge accumulated in a parasitic capacity of the photoelectric converting element to initialize the circuit before detecting a light signal. The image sensor can obtain a voltage signal corresponding to the quantity of incident light even if the sensor current was rapidly changed, thereby eliminating the possibility of occurrence of afterglow of each pixel even at a small quantity of incident light.

REFERENCES:
patent: 5808677 (1998-09-01), Yonemoto
patent: 5933190 (1999-08-01), Dierickx et al.
patent: 6252462 (2001-06-01), Hoffman
patent: 2005/0167602 (2005-08-01), Dierickx
patent: 5-219443 (1993-08-01), None
patent: 7-46481 (1995-02-01), None

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