Matrix of photosensitive elements and an associated reading meth

Details Matrix of photosensitive elements and an associated reading meth Matrix of photosensitive elements and an associated reading meth

1987-01-16

1989-01-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

35821328, H01J 4014

Patent

active

047975601

ABSTRACT:
The invention provides a matrix of photosensitive elements in which each photosensitive element is reduced to the association of a diode and a capacity. The method for manufacture thereof is therefore easy particularly from amorphous silicon. The method for reading same uses multiplexed reading of the columns: the n columns are distributed in groups of n/M successive columns controlled simultaneously by M horizontal shift registers, each associated with a reading integrator. To ensure correct reading of the useful signal, whatever their level, the level of the voltages at the terminals of the diodes of the photosensitive elements is reset so that the starting voltage at the beginning of each reading pulse applied to a line is such that only this pulse, and even with a maximum useful illumination signal, can bias the diode forwardly, and so that with a column addressing pulse, the diode is biased forwardly even in the absence of the useful signal.

REFERENCES:
patent: 3521244 (1970-07-01), Weimer
patent: 3536830 (1970-10-01), Hakki
patent: 3540011 (1970-11-01), Stupp et al.
patent: 4400409 (1983-08-01), Izu et al.
patent: 4495409 (1985-01-01), Baji et al.
patent: 4605969 (1986-08-01), Green
patent: 4617471 (1986-10-01), Suzuki et al.

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