Radiation imagery chemistry: process – composition – or product th – Producing cathode-ray tube or element thereof
Patent
1994-08-30
1995-10-03
Rosasco, S.
Radiation imagery chemistry: process, composition, or product th
Producing cathode-ray tube or element thereof
430 25, 430 26, 430 27, 430 28, G03C 500
Patent
active
054551331
ABSTRACT:
In accordance with the present invention, a method of electrophotographically manufacturing a luminescent screen assembly on an interior surface of a faceplate panel 12 of a color CRT 10 comprises the steps of coating the interior surface of the panel with a volatilizable, organic conductive material to form an organic conductive (OC) layer 32, and overcoating the OC layer 32 with a volatilizable, photoconductive material to form an organic photoconductive (OPC) layer 34. Then, a substantially uniform voltage is established on the OPC layer 34, and selected areas of the OPC layer 34 are exposed to visible light to affect the voltage thereon, without affecting the voltage on the unexposed area of the OPC layer 34. Next, triboelectrically charged, light-absorbing screen structure material is deposited onto the unexposed area of the OPC layer 34 to form a substantially continuous matrix 23 of light-absorbing material having open areas therein. The present method is an improvement over prior methods in that the present method includes the additional steps of forming a planarizing layer 35, 135 on the OPC layer 34; overcoating the planarizing layer 35, 135 with a second coating of the volatilizable, organic conductive material to form a second OC layer 132, and then overcoating the second OC layer 132 with a second coating of the volatilizable, organic photoconductive material to form a second OPC layer 134. The phosphor materials are deposited onto a suitable charged and exposed second OPC layer 134 so that the phosphors completely overlie the openings in the matrix 23 and overlap at least a portion of the matrix adjacent to the openings.
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patent: 5240801 (1993-08-01), Hayashi et al.
Gorog Istvan
Ritt Peter M.
Coughlin Jr. Vincent J.
Irlbeck Dennis H.
Rosasco S.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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