Light sensing pixel sensor and method

Details Light sensing pixel sensor and method Light sensing pixel sensor and method

2007-02-13

2007-02-13

Ho, Tuan (Department: 2622)

Television

Camera, system and detail

Solid-state image sensor

C348S308000

Reexamination Certificate

active

10609853

ABSTRACT:
A photodetector (105) generates an electrical signal that has a value that changes approximately linearly at a rate that is proportional to an amount of light intensity incident on a photodetector since a most recent reset command was received at a reset input of the photodetector. A measurement circuit (110) generates a comparison state that is based on a comparison of the value of the photodetector signal to a reference signal in response to one of a plurality a sample pulses. A control circuit (160) generates the plurality of sample pulses at non-uniform time intervals and generates an elapsed time as an accumulation of the non-uniform time intervals occurring from the reset command to a change of the comparison state. In one embodiment, the reciprocal of an accumulated duration of the non-uniform time intervals is a linear function of a number of time intervals after the reset command.

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Guo, X;.; Erwin, M.; Harris, J. “A Time-Based Asynchronous Readout (TBAR) CMOS Image Sensor For High-Dynamic Range Applications”IEEE Sensors 2000 Conference.

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