Wide dynamic range active pixel with knee response

Details Wide dynamic range active pixel with knee response Wide dynamic range active pixel with knee response

2007-02-23

2010-06-29

Ye, Lin (Department: 2622)

Television

Camera, system and detail

Solid-state image sensor

C348S299000, C348S302000

Reexamination Certificate

active

07746398

ABSTRACT:
A pixel circuit, and a method for operating a pixel circuit, to provide a multiple knee response characteristic. In one embodiment a pixel circuit comprises a photoconversion device for accumulating charge during a first integration period and second integration period, an integration node connected to the photoconversion device, a first transistor having one terminal connected to said integration node and another terminal connected to a reset signal line and a feed-through pulse capacitor. The feed-through pulse capacitor has one terminal coupled to a feed-through pulse signal line, and a second terminal coupled to the integration node, said feed-through pulse signal line providing an intermediate pulse between the first and second integration periods to generate an overflow current in said the transistor.

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