Method of forming a fluorescent screen of a black matrix type color picture tube

Claim 1

In a method of forming a fluorescent screen of a black matrix type color picture tube wherein a plurality of trios of phosphor are arranged, in a predetermined pattern, on the inner surface of a face plate of the color picture tube with a film of a light absorptive material applied on gaps between the patterned trios, said method comprising the steps of: forming a porous light absorptive film on the inner surface of the face plate; forming a light-hardenable photosensitive resin film on the light absorptive film with some absorption of the resin material into the underlying upper region of the light absorptive film; exposing to light the portion of the light-hardenable resin film corresponding to a phosphor applying portion through a shadow mask sufficient to harden the exposed portion and said underlying upper region to firmly couple said films at their interface; removing the unexposed portion of the light-hardenable photosensitive film by developing; and continuing the development to remove the exposed portion of the light-hardenable photosensitive film and portion of the light absorptive film therebeneath to partly perforate the light absorptive film so that in the light absorptive film, openings are formed into which the phosphor is applied.