Photoarray for detecting time-dependent image data

Details Photoarray for detecting time-dependent image data Photoarray for detecting time-dependent image data

2007-12-03

2010-06-01

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140AG, C348S297000, C348S308000, C257S312000

Reexamination Certificate

active

07728269

ABSTRACT:
A photoarray includes a one-dimensional or two-dimensional array of cells, each having a photosensor generating a sensor signal dependent on a light intensity at the cell, a first capacitor charged by a time-derivative of a current, at least one threshold detector detecting if a voltage over the first capacitor exceeds a threshold value and generating an output signal if it does, and a discharge device for discharging the first capacitor after occurrence of the output signal. Such a cell generates an event only when the incoming light intensity changes, which reduces the amount of data to be processed from the photoarray.

REFERENCES:
patent: 3626825 (1971-12-01), Years
patent: 5184018 (1993-02-01), Conrads et al.
patent: 6253161 (2001-06-01), Arias-Estrada
patent: 2002/0190193 (2002-12-01), Mizuno et al.
patent: 2003/0015647 (2003-01-01), Guo et al.
patent: 2003/0057358 (2003-03-01), Yuan
International Search Report, dated Sep. 5, 2006.

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