Abstract: A composition and method of forming an internal neutral density filter on a luminescent screen assembly of a cathode ray tube (CRT) is disclosed. The luminescent screen assembly is formed on an interior surface of a glass faceplate panel of the CRT tube. The luminescent screen assembly includes a patterned light-absorbing matrix that defines three sets of fields corresponding to one of a blue region, a green region and a red region. An internal neutral density filter is formed on the light-absorbing matrix. An array of blue, green and red color phosphors is formed on the internal neutral density filter corresponding to one of the blue region, the green region and the red region defined in the light-absorbing matrix. The internal neutral density filter has a composition including a red pigment, a blue pigment and at least one non-pigmented oxide particle.

Abstract: The method of assembling an electron gun for a cathode-ray tube comprises the steps loading of at least two electrodes (20, 70) one above the other, adjusting the distance between the electrodes along the longitudinal axis of the gun, and loading the electrodes between the two jaws (30, 30′, 31, 31′, 60, 60′, 61, 61′) of a positioning tool (35). The further includes positioning of the electrodes in the plane perpendicular to the longitudinal axis by clamping the jaws of the tool in a single direction, until a pressure is exerted on four corners (23) of each electrode and retaining by hot insertion of glass beads (40) into claws arranged on the periphery of the electrode openings of the positioning tool. The tool holds the electrodes in planes perpendicular to the longitudinal axis of the gun.

Abstract: A display apparatus comprising an evacuated envelope having an interior surface and an exterior surface is disclosed. The envelope includes a faceplate having a luminescent screen on the interior surface thereof. An electron gun is disposed within a neck of the envelope for generating at least one electron beam that is directed toward the luminescent screen. A funnel connects the neck of the envelope with the faceplate. A deflection yoke is disposed around the envelope at the junction of the neck and the funnel. The yoke is attached to the envelope with an adhesive. A resistive primer coating is disposed on the envelope and forms a barrier between the yoke adhesive and the envelope. The resistive primer coating is formed from an aqueous formulation comprising a copolymer of chloroprene and methacrylic acid, a conductive filler material and at least one cross-linking agent.

Abstract: A method of filming a luminescent screen is disclosed which improves the light output of CRTs that contain printed phosphor lines. The method incorporates both the application and film formulation requirements and optionally includes in-line diagnostic techniques. The novel film formulation contains a lacquer and solvents, wherein one of the solvents is a non-solvent for the lacquer. The optional diagnostic technique include surface gloss measurements to characterize and monitor the process and provide predictive capability of CRT performance with respect to light output.

Abstract: A reflecting light polarizer having improved polarizing efficiency, and a method of manufacturing the reflecting light polarizer. The reflecting light poplarizer includes a first non-linear mating surface, a second non-linear mating surface and a polarizing coating disposed between the first and second non-linear mating surfaces wherein a first light polarization is transmitted through the reflecting light polarizer and a second light polarization is reflected by the reflecting light polarizer. The reflecting light polarizer can further include glue disposed between the first non-linear mating surface and the second non-linear mating surface. The reflecting light polarizer also can include at least one clamping device securing together the first non-linear mating surface and the second non-linear mating surface. The first and second non-linear mating surfaces can be glass, plastic or crystalline.

Abstract: The oxide cathode comprises a support and an oxide layer on the latter. It furthermore includes particles of a conducting material having a first end incorporated in the support and a second end lodged in the oxide layer, so as to constitute conducting bridges passing through an interface layer forming between the support and the oxide layer. The invention also relates to a process for manufacturing such a cathode. The conducting particles make it possible to improve the electrical conductivity of the cathode, both within the oxide layer and within the interface layer.

Abstract: A color cathode-ray tube (CRT) has an evacuated envelope with an electron gun therein for generating at least one electron beam. The envelope further includes a faceplate panel having a luminescent screen with phosphor elements on an interior surface thereof. A focus mask, having a plurality of spaced-apart first conductive strands, is located adjacent to an effective picture area of the screen. The spacing between the first conductive strands defines a plurality of apertures substantially parallel to the phosphor elements on the screen. Each of the first conductive strands has a substantially continuous insulating material layer formed on a screen facing side thereof. A plurality of second conductive wires are oriented substantially perpendicular to the plurality of first conductive strands and are bonded thereto by the insulating material layer. The insulating material layer is composed of a silicate material.

Abstract: The invention concerns a display screen with active matrix comprising first and second transparent substrates enclosing a crystal liquid material, at least one counter electrode, pixel electrodes in lines and in columns, data lines, perpendicular selection lines, control devices for connecting the lines to the pixel electrodes, the pixel electrodes being controlled such that the electrodes connected to a common selection line have the same polarity while, for two adjacent selection lines the polarity is reversed, the pixel electrodes being located in a first plane while the other elements are located in a second plane distanced from the first plane, and a transparent mass plane being located between the two planes. Moreover, the mass plane has a structure such that at least the part found between two pixel electrodes of same polarity is recessed. The invention is applicable to LCD.

Abstract: A detensioning mask frame assembly for a cathode-ray tube including a subframe constructed of support members that provide a support structure for mask holding blades is disclosed. The support members have different temperature coefficients of expansion, such that when heated, the support members are deflected with different thermal expansion rates causing the mask holding blades to move toward each other, and as such, relieve tension from the mask.

Abstract: 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.

Abstract: A method for manufacturing a metallized luminescent screen, for a cathode-ray tube, includes the steps of: depositing at least one phosphor layer on an inner surface of a faceplate of a panel to form said luminescent screen, depositing on said layer a sub-layer consisting of a lacquer, drying said sub-layer to form a film, coating at least partially the internal surface of the faceplate panel with an aqueous solution of a copolymer of acrylic/styrene, drying the copolymer coating, depositing a metallic layer onto said copolymer coating, removing the organic materials contained in the luminescent screen, the film and the copolymer coating, by baking the tube panel.