Method and system for resetting image sensors

Details Method and system for resetting image sensors Method and system for resetting image sensors

2006-06-27

2006-06-27

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S308000

Reexamination Certificate

active

07067786

ABSTRACT:
An exemplary CMOS image sensor comprises a reset transistor, a photodiode, reset drain voltage circuitry, and reset gate voltage circuitry. A cathode of the photodiode is connected to a source of the reset transistor, and an anode of the photodiode is connected to ground. The reset drain voltage circuitry is connected to a drain of the reset transistor, and the reset gate voltage circuitry is connected to a gate of the reset transistor. During an exemplary hard reset operation, the reset drain voltage circuitry supplies a first drain voltage to the drain of the reset transistor in accordance with a determined level of light for exposure, which is determined dynamically. According to another exemplary reset operation, a hard reset phase is immediately followed by a soft reset phase.

REFERENCES:
patent: 2002/0018133 (2002-02-01), Mendis

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