Method of forming a matrix for an electrophotographically manufa

Details Method of forming a matrix for an electrophotographically manufa Method of forming a matrix for an electrophotographically manufa

1992-01-27

1993-08-31

McCamish, Marion E.

Radiation imagery chemistry: process, composition, or product th

Producing cathode-ray tube or element thereof

430 28, 430132, 427 68, G03G 500

Patent

active

052407985

ABSTRACT:
A luminescent screen assembly for a CRT is made by first coating the interior surface of a faceplate panel with a photoconductive layer which overlies a conductive layer. A multiplicity of red-, green- and blue-emitting phosphor screen elements are then deposited in color groups, in a cyclic order, onto the interior surface of the panel. A substantially uniform charge is established on the photoconductive layer. The charge is weakened in the areas where the photoconductive layer underlies the phosphor screen elements, but unaffected in the open areas separating the phosphor screen elements. The charged open areas of the photoconductive layer are directly developed by depositing thereon particles of light-absorptive matrix material having a triboelectric charge opposite in polarity to the charge established on the photoconductive layer. The attenuation of the charge on the photoconductive layer by the overlying phosphor materials produces a sufficient voltage contrast with the charge on the open areas of the photoconductive layer to provide a high opacity matrix.

REFERENCES:
patent: 4448866 (1984-05-01), Olieslagers et al.
patent: 4921767 (1990-05-01), Datta et al.
patent: 5028501 (1991-07-01), Ritt et al.
patent: 5093217 (1992-03-01), Datta et al.

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