Radiation imagery chemistry: process – composition – or product th – Producing cathode-ray tube or element thereof – With light-absorbing matrix on faceplate
Patent
1990-08-29
1992-02-04
Van Le, Hoa
Radiation imagery chemistry: process, composition, or product th
Producing cathode-ray tube or element thereof
With light-absorbing matrix on faceplate
430 26, G03C 500
Patent
active
050859587
ABSTRACT:
A manufacturing method of phosphor film of a color cathode ray tube comprising the steps of: forming a photoresist layer on the inner surface of panel provided with black matrix; drying the photoresist layer and exposing it to the light to form a predetermined pattern; spraying phosphor powder, in such a manner that the sprayed area is in the form of stripe having shorter width than the length of the sides of the bottom surface of panel and said sprayed area is moved along the vertical direction or the horizontal direction over the bottom surface of said panel; developing the desired phosphor stripe, in such a manner that compressed air or developing water is supplied on the inner surface of the panel coated with phosphor powder. In the method, the occurrence of the variation of the luminance of the screen due to the local variation of the thickness of the phosphor layer, is prevented, thereby achieving high quality image of the cathode ray tube.
REFERENCES:
patent: 2790107 (1957-04-01), Bradley
patent: 3437482 (1969-04-01), Yamada et al.
patent: 3856525 (1974-12-01), Inoue
patent: 3890151 (1975-06-01), Suzuki et al.
patent: 4271247 (1981-06-01), Morrell
patent: 4556620 (1985-12-01), Thompson
Le Hoa Van
Samsung Electron Devices Co. Ltd.
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