Videocolor

Thomson Licensing S.a.

Antimo Pezzulo

Himanshu M Patel

Himanshu Mukundray Patel

Silvano Dilorio

Attilio Di Passio

Alfredo Palumbo

Method for manufacturing a metallized luminescent screen

A method of manufacturing a phosphor screen (22) on an interior surface (23) of a faceplate panel (12) is characterized by the steps of: forming a light-absorbing matrix (24) on an interior surface (23) of the faceplate panel (12); applying an aqueous surfactant solution thereto to solubilize oily contaminants and emulsify undissolved oily contaminants of the matrix (24); and serially applying three light-emitting phosphors (G, B, R) to the interior surface (23) of the faceplate panel (12) to form the phosphor screen (22).

Method of manufacturing a phosphor screen

A method for manufacturing a metallic, luminescent screen for a CRT includes the steps of: depositing at least one phosphor layer on an inner surface of a faceplate of a panel, to form the luminescent screen; preheating the panel containing the screen to a temperature in excess of a minimum film-forming temperature; and depositing an aqueous emulsion of at least one acrylic film-forming resin onto a screen and drying said emulsion to form the film. Then, a metallic coating is deposited onto the film and the panel bearing the metallized screen is sealed to a funnel by heating the panel and funnel through a sealing cycle. The sealing cycle has predetermined rates of temperature increase and includes a temperature range within which the film is volatilized. The rate of temperature increase within the volatilization range is less than the rate of temperature increase in other portions of the sealing cycle.

Method for manufacturing a metallized luminescent screen for a

The present invention relates to a method for making a viewing screen structure for a cathode-ray tube. The method includes the steps of coating a support surface with a film of a polymeric material, a suitable dichromate and a sensitizer therefor which is a chromium ion migration enhancer having a reduced sensitivity to thermal and dark hardening; exposing the film to an image in the form of radiant energy until the solubility of the irradiated regions thereof is selectively altered, thereby producing in the film regions of greater solubility and regions of lesser solubility; removing those regions of the film with greater solubility to bare portions of the underlying support surface while retaining those regions of the film with lesser solubility. The bare portions of the support surface and the retained film regions are overcoated with a composition of light-absorbing material which is adherent to the support surface. A solution of an oxidant is applied to the light absorbing material to selectively dissolve the retained film regions. The dissolved retained film regions and the light-absorbing material thereon are flushed-away leaving the light-absorbing material adhering to the support surface. Following the above-described steps, a luminescent screen is formed by depositing phosphor materials on areas of the support surface previously occupied by the retained film regions.

Method for making a viewing screen structure for CRT

A method for the metallizing of a luminescent screen comprises the following steps:

Method for the metallization of a luminescent screen

A method for the metallization of a luminescent screen comprises the following steps:

In order to deposit an antireflection layer between the phosphor strips of the screen of a color television tube and on the face-plate flange, a photosensitive substance is applied on the internal face of the face-plate and is then exposed to radiation-hardening at the phosphor-strip locations, whereupon the non-hardened portions are removed. The flange and face-plate are then coated with the antireflection layer, H.sub.2 O.sub.2 is deposited in order to destroy the hardened strips which are finally removed together with their antireflection coating. Deionized water, for ensuring that the film of hardened photosensitive material which has formed on the flange is made uniform, is spray-deposited on the flange prior to deposition of photosensitive substance. After deposition of the antireflection layer, deionized water is also sprayed onto this layer prior to application of the oxygenated water. The destructive activity of the oxygenated water on the film is thus reduced.

Growing community of inventors

Anagni, Italy

Antimo Pezzulo