Black dielectric mask on white substrate

Details Black dielectric mask on white substrate Black dielectric mask on white substrate

1974-11-01

1976-05-04

Esposito, Michael F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428209, 428469, 428539, B32B 300, B32B 714

Patent

active

039550230

ABSTRACT:
An improved method is provided for applying a dark dielectric surface to a white substrate as used in headers for light emitting diode displays. Light reflectance is reduced without degrading the insulating properties of the dielectric. A paste comprising fine grain alumina and up to 20% by weight of an oxide or metal powder of either molybdenum or tungsten is applied to an alumina substrate. The substrate is then subjected to a reducing atmosphere, wherein the molybdenum or tungsten material is reduced to a black color. The resulting metal phase forms a dielectric layer of low light reflectance without impairing the insulating properties of the dielectric.

REFERENCES:
patent: 3556843 (1971-01-01), Buck

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