CMOS active pixel cell with self reset for improved dynamic rang

Details CMOS active pixel cell with self reset for improved dynamic rang CMOS active pixel cell with self reset for improved dynamic rang

1997-06-27

2000-10-10

Ho, Tuan

Television

Camera, system and detail

Solid-state image sensor

348297, H04N 5335

Patent

active

061307130

ABSTRACT:
An image cell having self-reset which provides improved dynamic range is achieved by having a reset circuit, a comparator circuit and a memory circuit. The image cell operates such that the comparator circuit compares the voltage potential of the image cell with a reference voltage potential. Once the comparator circuit senses that the voltage potential of the image cell transcends the reference voltage potential, the comparator circuit sends a reset signal to the reset circuit. The reset circuit then resets the image cell. Each time the image cell is reset, a reset value is stored in the memory circuit, and the sum of the reset values stored in the memory circuit corresponds to the number of times the image cell has been reset. By resetting the image cell a plurality of times, the dynamic range of a conventional image cell can be increased.

REFERENCES:
patent: 5933190 (1999-08-01), Dierickx et al.
patent: 6011251 (2000-01-01), Dierickx et al.
patent: 6043470 (2000-03-01), Chiang
patent: 6046444 (2000-04-01), Afghahi

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