Photo-sensitive element used in electro-optical sensors to...

Details Photo-sensitive element used in electro-optical sensors to... Photo-sensitive element used in electro-optical sensors to...

2005-11-15

2008-05-27

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S214100

Reexamination Certificate

active

07378638

ABSTRACT:
Photo-sensitive element for electro-optical sensors, including at least a photodiode able to generate a current that is function of the incident light, a conversion circuit able to convert the current generated into a voltage signal, a comparator able to commute if the voltage signal reaches or exceeds a determinate threshold signal, and at least a measuring and memorization element able to measure and memorize the temporal instant of commutation of the comparator and able to be driven by a reference signal in order to render available to an output line a signal estimating the incident light. The reference signal is of the type that can be programmed from outside.

REFERENCES:
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patent: 6498576 (2002-12-01), Tian et al.
patent: 6940589 (2005-09-01), Suyama et al.
Institute for Microelectronics Stuttgart, Ulrich Seger et al., “Vision Assistance in Scences with Extreme Contrast”, 1993, pp. 50-56.

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