Humidity and temperature insensitive organic conductor for electrophotographic screening process

In a method of 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 conductive solution to form a volatilizable organic conductive layer;
• b) overcoating said organic conductive layer with a photoconductive solution to form a volatilizable organic photoconductive layer;
• c) establishing a substantially uniform electrostatic charge on said photoconductive layer;
• d) exposing selected areas of said photoconductive layer to actinic radiation to affect the charge thereon;
• e) developing said photoconductive layer with at least one dry-powdered, light emitting, triboelectrically charged screen structure material;
• f) fixing said screen structure material to said photoconductive layer to minimize displacement thereof;
• g) filming said fixed screen structure material to form a film layer thereon;
• h) aluminizing said filmed layer;
• and
• i) baking said faceplate panel in air at a temperature of at least 450° C. to volatilize the constituents of said screen assembly, including said organic conductive layer, said organic photoconductive layer and said film layer, the improvement wherein said conductive solution comprises:
• 3,4-polyethylene dioxythiophene polystyrene sulphonate (PEDT/PSS);
• a polymer or co-polymer selected from the group consisting of polyvinylpyrrolidone (PVP), poly (vinyl pyridine-co-vinyl acetate) (PVPy-VAc), polymethacrylic acid (PMAA), poly (hydroxyethylacrylate-co-methacrylic acid) (PHEA-MAA), poly (hydroxyethyl methacrylate) (PHEMA) and polyvinylbutyral (PVB) to reduce residue after said baking step at 450° C.;
• and a suitable solvent.