Method of manufacturing a luminescent screen for a CRT

In a method of manufacturing a luminescent screen assembly for a color CRT on an interior surface of a faceplate panel thereof, said interior surface of said panel being provided with a volatilizable organic conductive (OC) layer and overcoated with a volatilizable organic photoconductive (OPC) layer, said OPC layer comprising polystyrene resin;

• 2,4-DMPBT as an electron donor material;
• and TNF and 2-EAQ as electron acceptor materials, said method including the steps of:
• a) establishing a substantially uniform electrostatic charge on said OPC layer;
• b) exposing selected areas of said OPC layer to visible light to affect the charge thereon;
• c) developing the selected areas of said OPC layer with a triboelectrically charged, dry-powdered, first color-emitting phosphor;
• d) sequentially repeating steps a, b and c for triboelectrically charged, dry-powdered, second and third color-emitting phosphors to form a luminescent screen comprising picture elements of triads of color-emitting phosphors;
• and
• e) simultaneously fixing and filming said phosphors to the underlying OPC layer with a suitable solvent;
• the improvement wherein
• said simultaneous fixing and filming step including electrostatic spraying said solvent having a boiling point within the range of about 100.degree. to 150.degree. C., onto said phosphors and said OPC layer without moving said phosphors, whereby said OPC layer is dissolved so as to substantially totally encapsulate said phosphors.

In a method of manufacturing a luminescent screen assembly for a color CRT on an interior surface of a faceplate panel thereof, said interior surface of said panel being provided with a volatilizable organic conductive (OC) layer and overcoated with a volatilizable organic photoconductive (OPC) layer, said OPC layer comprising a polystyrene resin;

• 2,4-DMPBT as an electron donor material;
• and TNF and 2-EAQ as electron acceptor materials, said method including the steps of:
• a) establishing a substantially uniform electrostatic charge on said OPC layer;
• b) exposing selected areas of said OPC layer to visible light to affect the charge thereon;
• c) developing the selected areas of said OPC layer with a triboelectrically charged, dry-powdered, first color-emitting phosphor;
• d) sequentially repeating steps a, b and c for triboelectrically charged, dry-powdered, second and third color-emitting phosphors to form a luminescent screen comprising picture elements of triads of color-emitting phosphors;
• and
• e) fixing said phosphors to the underlying OPC layer with a suitable fixative;
• the improvement wherein
• said fixing step including electrostatic spraying charged droplets of said fixative to wet said phosphors and the underlying OPC layer, to rapidly secure said phosphors thereto without moving said phosphors, said fixative being selected from the group of solvents consisting of acetone, amyl acetate, butyl acetate, MIBK, MEK, toluene, and xylene.