Photosensitive matrix with three diodes per dot without optical

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit

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35821322, H01J 4014

Patent

active

049576593

ABSTRACT:
The disclosure concerns matrices of photosensitive elements. To avoid the need for a resetting light source using, as a photosensitive dot, a photodiode in series with a capacitor between a row conductor and a column conductor, it is proposed, according to the invention, to provide for a photosensitive dot comprising three diodes (a photosensitive diode, a reading diode and a resetting diode) connected to a common floating node. In one embodiment, the anode of the photosensitive diode is connected to a row-addressing conductor giving a reading pulse to the selected line; the cathode of the reading diode is connected to the column conductor which collects the useful signal; and the anode of the resetting diode is connected to a second row conductor (which, besides, may be the first conductor of a neighbouring row) which receives a resetting pulse after the reading pulse. In another embodiment, the photosensitive diode is turned back, its cathode being then connected to a row conductor; the resetting diode is simply connected to a reference voltage source.

REFERENCES:
patent: 3935446 (1976-01-01), Michon
patent: 4117514 (1978-09-01), Terui et al.
patent: 4281254 (1981-07-01), Seachman
patent: 4382187 (1983-05-01), Fraleux et al.
patent: 4695715 (1987-09-01), Malm

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