Solid state light-sensitive device and method for reading such a

Details Solid state light-sensitive device and method for reading such a Solid state light-sensitive device and method for reading such a

1987-01-20

1989-05-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

35821316, H01J 4014

Patent

active

048271454

ABSTRACT:
According to the invention, each light-sensitive element is made up by the series-connection of a capacitor, a photodiode and an electronic switch. The light signal to be read is applied to the device after the photodiodes have been reverse polarized by a voltage pulse with an amplitude V.sub.P1. The device is read row by row, by the application of a voltage pulse with an amplitude V.sub.P2 greater than V.sub.P1 to each row read. The switches of the read row are closed while the switches of the other rows are open. Once the device is read, the photodiodes are zeroized.

REFERENCES:
patent: 3521244 (1970-07-01), Weimer
patent: 4380755 (1983-04-01), Endlicher et al.
patent: 4686373 (1987-08-01), Tew et al.
patent: 4707615 (1987-11-01), Hosaka

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