Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-12-21
1997-07-15
Le, Que
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
257443, 348294, H01J 4014
Patent
active
056486545
ABSTRACT:
A flat panel radiation imaging device that exhibits reduced capacitive coupling between pixel photodiode electrodes and readout data lines, and thus exhibits reduced phantom images and image artifacts in operation, includes a low-capacitive-coupling common electrode disposed over a pixel array of photosensors, switching transistors, and address lines that are arranged in an imaging array pattern of rows and columns. The low-capacitive coupling common electrode includes a plurality of common electrode column segments oriented along the same axis as the data lines in the array, with each of the common electrode column segments corresponding to a respective column of photosensors in the imaging array pattern. Each of the common electrode column segments is disposed so as to have a non-zero setoff distance from data line adjacent to a column of photosensors and so as to overlie the photosensor pixel electrode by a selected overlap distance between the common electrode column segment and the pixel electrode in the pixel.
REFERENCES:
patent: 4873516 (1989-10-01), Castleberry
patent: 5121214 (1992-06-01), Turko et al.
General Electric Company
Ingraham Donald S.
Le Que
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