Method of producing light-absorbing edging about phosphor dots o

Details Method of producing light-absorbing edging about phosphor dots o Method of producing light-absorbing edging about phosphor dots o

1979-02-15

1981-01-06

Hoffman, James R.

Radiation imagery chemistry: process, composition, or product th

Producing cathode-ray tube or element thereof

With light-absorbing matrix on faceplate

427 68, H01J 2932, H01J 2928, H01J 9227

Patent

active

042437350

ABSTRACT:
A slurry comprised of particulated glass-forming substances, with or without particulated relatively clear or light-colored metal oxides, dispersed in a photolacquer is applied as a uniform layer on a surface of a color image screen. Such layer is then developed via conventional photoforming techniques to produce sites or windows for phosphor dots and the resultant window-containing layer is heated, prior or subsequent to application of phosphor dots in such windows, at a temperature in the range of about 350.degree. to 500.degree. C. In instances where metal oxide particles are present in the slurry, the resultant layer becomes opaque or dark upon tempering and in cases where only pure glass-forming substance particles are in the slurry, the resultant layer becomes opaque or dark upon tempering in a reducing atmosphere. Electrical conductivity may be imparted to the light-absorbing coating by addition of selective conductive materials to the initial slurry.

REFERENCES:
patent: 3654505 (1972-04-01), Davis et al.
patent: 3858083 (1974-12-01), Rehkopf et al.
patent: 4019905 (1977-04-01), Tomita et al.
patent: 4020191 (1977-04-01), Nagashiro et al.
Ohishi et al., "An Experimental Real-Time Color-TV Display with a DC Gas-Discharge Panel", IEEE Transactions on Electron Devices, vol. ED-22, No. 9, Sep. 1975, pp. 650-653.

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