Radiation imagery chemistry: process – composition – or product th – Producing cathode-ray tube or element thereof – With light-absorbing matrix on faceplate
Patent
1979-11-02
1981-02-17
Kimlin, Edward C.
Radiation imagery chemistry: process, composition, or product th
Producing cathode-ray tube or element thereof
With light-absorbing matrix on faceplate
354 1, 427 68, 430 24, G03C 500
Patent
active
042516102
ABSTRACT:
An improved method of forming a multicolor cathode-ray tube display screen to minimize phosphor contamination. A light-absorbing matrix is first formed on the inner surface of a CRT faceplate, preferably by photoetching of a substantially black metallic layer. Then, multiple color dot patterns are deposited in the matrix openings by (a) depositing a layer of positive photoresist on the matrix and any previously-deposited dot pattern; (b) exposing the resist through a shadow mask to light from a point source positioned to simulate an electron gun; (c) developing the resist to form an integral mask containing a pattern of holes aligned with the matrix openings for one color phosphor; (d) coating the developed resist layer with a photohardenable phosphor slurry; (e) exposing the slurry coating through the faceplate to light from a diffuse source; (f) developing the slurry to remove the unexposed portions, leaving a pattern of dots of one color; and (g) stripping away the photoresist masking layer. Steps (a) through (g) are then repeated to produce each additional color dot pattern.
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Chitwood Donald P.
Haven Duane A.
Kimlin Edward C.
Tektronix Inc.
Winkelman John D.
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