Method for detecting defective photosensor circuits in a photose

Details Method for detecting defective photosensor circuits in a photose Method for detecting defective photosensor circuits in a photose

1997-09-22

2000-10-31

Ho, Tuan

Television

Camera, system and detail

Combined image signal generator and general image signal...

348207, H04N 964

Patent

active

061410454

ABSTRACT:
A system by which defective circuitry associated with a single photosensor in an image sensor array can be readily detected, without the defect being "covered" by a good signal from a neighboring photosensor. The output line onto which a series of photosensors and their transfer circuits output video signals is grounded via a pulldown resistor. When a defective photosensor circuit fails to place a bias on the output line, the bias on the output line quickly drifts towards zero. By detecting this relatively sudden drift towards zero bias, a defective photosensor or its associated circuitry can be identified.

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patent: 5638121 (1997-06-01), Hosier et al.
patent: 6031571 (2000-02-01), Arakawa
patent: 6064431 (2000-05-01), Ueno

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