Method of manufacturing a luminescent screen assembly using a dry-powdered filming material
AssigneeRCA Licensing Corporation
InventorsPeter M. Ritt, Harry R. Stork
Life of this patent
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Abstract
In accordance with the present invention, a method of manufacturing a luminescent screen assembly on a substrate of a CRT includes the steps of providing a coating of a non-luminescent screen structure material in a predetermined pattern on the substrate and depositing a plurality of color-emitting screen structure materials on the substrate. The color-emitting screen structure materials are surrounded by the non-luminescent material. An electrostatically-charged dry-powdered resin is deposited onto the aforementioned color-emitting and non-luminescent screen structure materials and fused to form a substantially continuous film.
Claims15
In a method of manufacturing a luminescent screen assembly on a substrate of a color CRT comprising the steps of:
- a) providing a layer of a non-luminescent screen-structure material in a predetermined pattern on said substrate;
- and
- b) depositing a plurality of color-emitting screen-structure materials on said substrate, said color-emitting materials being surrounded by said non-luminescent material;
- wherein the improvement comprises the steps of:
- depositing an electrostatically-charged dry-powdered resin onto said non-luminescent and said color-emitting screen structure materials;
- and
- fusing said resin to form a substantially continuous film layer.
In a method of electrophotographically manufacturing a luminescent screen assembly o;
- a substrate of a color CRT comprising the steps of:
- a) coating said surface of said substrate with a volatilizable conductive layer;
- b) overcoating said conductive layer with a volatilizable photoconductive layer including a dye sensitive to visible light;
- c) establishing a substantially uniform electrostatic charge on said photoconductive layer;
- d) exposing selected areas of said photoconductive layer to visible light to affect the charge thereon;
- e) developing selected areas of said photoconductive layer with a triboelectrically charged, dry-powdered, first color-emitting phosphor material;
- and
- f) sequentially repeating steps c, d and e for triboelectrically charged, dry-powdered, second and third color-emitting phosphor materials to form a luminescent screen comprising picture elements of triads of color-emitting phosphor materials;
- wherein the improvement comprises the steps of:
- establishing an electrostatic charge on said photoconductive layer and the overlying phosphor materials;
- depositing an electrostatically charged dry-powdered resin onto said phosphor materials;
- and
- fusing said resin to form a substantially continuous film layer.
In a method of electrophotographically manufacturing a luminescent screen assembly on an interior surface of a faceplate panel for a color CRT comprising the steps of:
- a) coating said surface of said panel with a volatilizable conductive layer;
- b) overcoating said conductive layer with a volatilizable photoconductive layer including a dye sensitive to visible light;
- c) establishing a substantially uniform electrostatic charge on said photoconductive layer;
- d) exposing, through a mask, selected areas of said photoconductive layer to visible light from a xenon lamp to affect the charge on said photoconductive layer;
- e) directly developing the unexposed areas of the photoconductive layer with a triboelectrically charged, dry-powdered, surface-treated, light-absorptive screen structure material, the charge on said screen structure material being of opposite polarity to the charge on the unexposed areas of the photoconductive layer;
- f) reestablishing a substantially uniform electrostatic charge on said photoconductive layer and on said screen structure material;
- g) exposing, through said mask, first portions of said selected areas of said photoconductive layer to visible light from said lamp to affect the charge on said photoconductive layer;
- h) reversal developing of the first portions of said selected areas of said photoconductive layer with a triboelectrically charged, dry-powdered, first color-emitting phosphor screen structure material having a charge of the same polarity as that on the unexposed areas of said photoconductive layer and on said light-absorptive screen structure material to repel said first color-emitting phosphor therefrom;
- i) sequentially repeating steps f, g and h for second and third portions of said selected areas of said photoconductive layer using triboelectrically charged, dry-powdered, second and third color-emitting phosphor screen structure materials, thereby forming a luminescent screen comprising picture elements of triads of color-emitting phosphors;
- wherein the improvement comprises increasing the adherence of said surface-treated screen structure materials to said photoconductive layer by establishing a substantially uniform electrostatic charge on said photoconductive layer and the overlying screen structure materials,
- depositing an electrostatically charged dry-powdered resin onto said screen structure materials;
- and
- fusing said resin to form a substantially continuous water insoluble film layer.
Dependencies are inferred from the claim text.