A light sensor for removing ambient light level from the...

H - Electricity – 01 – G

Patent

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H01G 9/20 (2006.01) G01J 1/10 (2006.01) G06F 3/033 (2006.01)

Patent

CA 2467343

An active pixel sensor for use in ambient light conditions together with a controlled light source, the sensor producing a difference signal which is indicative of the intensity of light incident on the sensor from the controlled light source. The sensor operates in two phases and includes a photodetector coupled to processing circuitry coupled to storage circuitry. In the first phase, the photodetector generates an ambient light signal and the processing circuitry memorises the ambient light signal. In the second phase the photodetector generates a total light signal, the processing circuitry subtracts the stored memorised ambient light signal from the total light signal to produce the difference signal, and the storage circuitry stores the difference signal. The sensor alternates between the first and second phases in response to receiving a strobing signal, the strobing signal and the controlled light source being synchronised.

L'invention concerne un capteur à pixel actif à utiliser dans des conditions de lumière ambiante, conjointement avec une source lumineuse commandée, le capteur produisant un signal de différence indiquant l'intensité de la lumière incidente sur le capteur à partir de la source lumineuse commandée. Le capteur fonctionne en deux phases et comprend un photodétecteur couplé à un ensemble de circuits de traitement couplé à un ensemble de circuits de stockage. Dans la première phase, le photodétecteur génère un signal de lumière ambiante et l'ensemble de circuits de traitement mémorise ledit signal. Dans la seconde phase, le photodétecteur génère un signal de lumière globale, l'ensemble de circuits de traitement soustraie le signal de lumière ambiante mémorisé du signal de lumière globale, de manière à obtenir le signal de différence, et l'ensemble de circuits de stockage stocke le signal de différence. Le capteur alterne entre les première et seconde phases, en réponse à la réception d'un signal de strobage, ce dernier et la source lumineuse commandée étant synchronisés.

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