CMOS active pixel with hard and soft reset

Details CMOS active pixel with hard and soft reset CMOS active pixel with hard and soft reset

2004-01-06

2009-02-10

Ye, Lin (Department: 2622)

Television

Camera, system and detail

Solid-state image sensor

Reexamination Certificate

active

07489354

ABSTRACT:
A circuit for a pixel site in an imaging array includes a light-detecting element to convert incident light to a photocurrent and a reset transistor, operatively connected to the light-detecting element, to reset a voltage associated with the light-detecting element. The reset transistor hard resets the voltage associated with the light-detecting element and soft resets the voltage associated with the light-detecting element after the generation of the hard reset of the voltage associated with the light-detecting element. A pixel voltage of a column or row line is also measured by hard resetting the column or row line voltage to a first predetermined voltage; soft resetting the column or row line voltage to a first pixel voltage; hard resetting the column or row line voltage to a second predetermined voltage; soft resetting the column or row line voltage to a second pixel voltage; and determining a difference between the first and second pixel voltages, the difference being the measured pixel voltage.

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