Photosensitive matrix with two diodes of the same bias and one c

Details Photosensitive matrix with two diodes of the same bias and one c Photosensitive matrix with two diodes of the same bias and one c

1989-07-26

1991-01-15

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

35821331, H04N 314

Patent

active

049856197

ABSTRACT:
Each photosensitive dot of the photosensitive matrix disclosed is formed by one capacitor and two diodes. The capacitor is connected between a row conductor and a common floating node. A photodiode is connected between the floating node and a reference voltage source which biases it in reverse. A small-sized reading diode, hence one with low capacitance, is connected between the floating node and a column conductor. This structure enables the making of a matrix having a reduced column capacitance. It therefore enables a more efficient transfer of charges from the photodiodes to the reading circuit connected at the end of a column.

REFERENCES:
patent: 4200892 (1980-04-01), Weimer
patent: 4906855 (1990-03-01), Berger et al.

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