Timing independent pixel-scale light sensing apparatus

Details Timing independent pixel-scale light sensing apparatus Timing independent pixel-scale light sensing apparatus

1990-11-28

1992-10-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

35821322, H01J 4014

Patent

active

051534207

ABSTRACT:
A light sensing apparatus adaptable for inclusion in an array of such apparatus is operable independent of polling cycle providing a more accurate sensing of the patterns of illumination incident on an array of such apparatus. The apparatus facilitates utlizing each address line to simultaneously initialize one row of apparatus while enabling the subsequent row of apparatus. The apparatus is also compatible with elements capable of providing gain, given that the photosensitive element is separate from the path across which voltage or current is measured. The apparatus may be fabricated of amorphous silicon. The light sensing cell includes an input terminal, an output terminal, a conductive element electrically interconnecting the input and output terminals, a multiple-state sensing device, means for establishing an initial state of the sensing device, means for changing the initial state of the sensing device in response to the incidence of electromagnetic or ionizing radiation (e.g., visible light) thereupon, and means connected to the conductive element and to the sensing device for modifying the conductance of the conductive element as a function of the state of the sensing device. A color filter may be interposed between a light source and the circuit or the array to provide color differentiation. Use of other filters and/or sensor types facilitates sensing electromagnetic radiation outside the visible light spectrum.

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