Thomson Licensing S.a.

Thomson Licensing

Kangning Liang

Pabitra Datta

Steven Anthony Colbert

Gregory James Cohee

Bhanumurthy Venkatrama Subrahmanya Gunturi

Victoria Ann Rebar

Nitin Vithalbhi Desai

A color filter luminescent screen assembly for a cathode ray tube (CRT) is disclosed. The luminescent screen assembly is formed on an interior surface of a faceplate panel of the CRT tube. The luminescent screen assembly includes a patterned light-absorbing matrix that defines a plurality of sets of fields corresponding to one of a blue region, a red region and a green region. A color filter is formed in one of the plurality of sets of fields. The color filter may be, for example, a blue pigment layer, a red pigment layer or a green pigment layer. After the pigment layer is formed, a cap layer is formed thereon. The cap layer is formed from an aqueous solution of a photosensitive material and a polymer. Thereafter, a phosphor layer is deposited on the cap layer.

Method of manufacturing a color filter cathode ray tube (CRT)

A method of manufacturing a cathode ray tube (CRT) having a color filter luminescent screen assembly is disclosed. The luminescent screen assembly is formed on an interior surface of a faceplate panel of the CRT tube. The luminescent screen assembly includes a patterned light-absorbing matrix that defines a plurality of sets of fields corresponding to one of a blue region, a red region and a green region. A color filter is formed in one of the plurality of sets of fields. The color filter is formed by applying a photosensitive material layer on the inner surface of the faceplate panel and exposing one of the sets of fields corresponding to the blue region, the red region or the green region, to harden the photosensitive material in such region. A pigment layer, having a color that corresponds to the color of the region of hardened photosensitive material, is then applied over the exposed photosensitive material layer. After the pigment layer is applied, the unhardened photosensitive material layer is removed to form the color filter.

Method of manufacturing a cathode ray tube (CRT) having a color filter

A method of manufacturing a luminescent screen assembly for a color cathode-ray tube (CRT) is disclosed. The luminescent screen assembly is formed on an interior surface of a faceplate panel of the CRT. The luminescent screen assembly includes a light-absorbing matrix having a plurality of substantially equally sized openings formed therein. The matrix is formed by applying one or more light sensitive layers on the interior surface of the faceplate panel of the CRT tube. The one or more light sensitive layers includes a photoresist material. Also, the one or more light sensitive layers includes a contrast enhancing material. The one or more light sensitive layers are selectively exposed to actinic radiation projected through openings in a shadow mask, positioned a fixed distance from the screen assembly. The invention involves two set of exposures to the one or more layers: a first dosage which causes selected regions of the contrasting enhancing material to bleach in such a manner that the contrasting enhancing material will behave as a filter for the second dosage, which predominantly causes the photoresist to substantially harden in the select regions. The second dosage is filtered as it propagates in the one or more layers such that the ratio of the level of actinic radiation in selected regions to the level of actinic radiation in non-selected regions is greater than the ratio of the corresponding incident second dosage in the selected regions to the non-selected regions, thereby making it easier to print matrix lines in CRTs having high transmission masks. Thereafter, the matrix lines are formed when matrix material is deposited onto uncovered areas of the screen surface followed by removal of retained portions of the one or more light sensitive layers. When separate layers are used for the photoresist material and the contrast enhancing material, a barrier layer may optionally be interposed therebetween.

Method of manufacturing a matrix for cathode-ray tube

In accordance with the present invention, a method of electrophotographically manufacturing a luminescent screen assembly on an interior surface of a faceplate panel,of a color CRT,includes the steps of: coating the surface of the panel with a conductive solution to form a volatilizable organic conductive layer,, and overcoating the organic conductive layer,with a photoconductive solution to form a volatilizable photoconductive layer,. The conductive solution comprises the organic polymer 3,4-polyethylene dioxythiophene polystyrene sulphonate (PEDT/PSS); a methanol-soluble 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) and poly (hydroxyethyl methacrylate) (PHEMA) to reduce organic residue; and a solvent.

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Lancaster, PA, United States of America

Kangning Liang