Thomson Consumer Electronics Inc.

Rca Thomson Licensing Corp.

Rca Licensing Corporation

Harry R Stork

Peter M Ritt

Pabitra Datta

Eugene Samuel Poliniak

Brian Thomas Collins

Charles M Wetzel

John J Moscony

Richard LaPeruta, Jr

Owen H Roberts, Jr

Nitin V Desai

George H Riddle

Ronald N Friel

Edward Richard Garrity, Jr

George M Ehemann, Jr

Dennis Ronald McCarthy

Robert E Simms

Carl C Steinmetz

A spray module 40 for manufacturing a cathode-ray tube (CRT) 10 comprises an enclosure 42 having sidewalls 44, a base 46 attached to the sidewalls 44, for closing one end thereof, and a panel support 48 having an opening, 50 therethrough. The panel support 48 is attached to an opposite end of the sidewalls 44. The spray module 40 has at least one electrostatic spray gun 36 therein for spraying charged screen structure material through the opening 50 in the panel support 48 and onto an interior surface of a faceplate panel 12 of the CRT 10. The spray module 40 includes a primary shield assembly 55 disposed within the enclosure 42 and extending through the opening 50 in the panel support 48. A secondary shield assembly 56 also is disposed within the enclosure 42 The primary and secondary shield assemblies 55 and 56, respectively, direct the charged screen structure material toward the interior surface of the panel 12, thereby increasing the transfer efficiency of the spray gun 36. A collecting tray 54 also is utilized to catch the spent spray which falls to the bottom of the spray module 40. The tray 54 is inclined toward a drain 100 that directs the spent material out of the spray module 40.

Spray module having shielding means and collecting means

In accordance with the present invention, a method of electro-photographically manufacturing a luminescent screen assembly on an interior surface of a faceplate panel 12 for a color CRT 10 includes the steps of coating the interior surface of the faceplate panel with a volatilizable, organic conductive solution to form an organic conductive (OC) layer 32, and overcoating the OC layer with a volatilizable, organic photoconductive solution to form an organic photoconductive (OPC) layer 34. The step of overcoating the OC layer to form the OPC layer is improved by the substeps of: grounding the OC layer; providing an organic photoconductive (OPC) solution comprising a resin, an electron donor material and electron acceptor material, and a suitable solvent; and spraying electrostatically-charged droplets of the OPC solution onto the OC layer, with at least one electrostatic spray gun 47, to provide an OPC layer, having uniform thickness, overlying the OC layer.

CRT electrophotographic screening method using an organic

A method of manufacturing a luminescent screen assembly on an interior surface of a faceplate panel 12 for a color CRT 10 includes the steps of uniformly applying a solution of a material to form an organic conductive (OC) layer and overcoating the OC layer with a solution to form an organic photoconductive (OPC) layer, on the interior surface of the faceplate panel. The OPC layer 34 is conditioned by directing a stream of dry gas thereon to warm the OPC layer to a preheat temperature, while maintaining the panel at a panel temperature less than the preheat temperature. The OPC layer is exposed to IR radiation to rapidly increase the temperature of the OPC layer to a curing temperature, greater than the preheat temperature, to remove some of the volatilizable constituents from the OPC layer, without substantially increasing the temperature of the panel. The OPC layer is then cooled by directing at least one stream of cool gas onto the surface thereof, to lower the temperature of the OPC layer to a subsequent processing temperature.

Method of manufacturing a luminescent screen for a CRT by conditioning a

In accordance with the present invention, an apparatus for developing a latent image formed on a photoreceptor, which is deposited on an interior surface of an output window of a display device, is disclosed. The developing apparatus includes a developing chamber, having a support surface for supporting the output window, a screen structure material reservoir for storing, deagglomerating and feeding the screen structure material, and a triboelectric gun assembly communicating with the reservoir. The gun assembly triboelectric charges and imparts a desired charge polarity to the screen structure material. The gun assembly further includes at least one material dispersing nozzle spaced from the support surface for distributing the charged material for deposition onto the latent image.

CRT developing apparatus

In accordance with the present invention, a method of electrophotographically manufacturing a luminescent screen assembly for a color CRT 10 on an interior surface of a faceplate panel 12 is described. A volatilizable organic conductive (OC) layer 32 is provided on the interior surface of the panel and a volatilizable organic photoconductive (OPC) layer 34 overlies the OC layer 32. The method includes the steps of: establishing a substantially uniform electrostatic charge on the OPC layer; exposing selected areas of the OPC layer to visible light to affect the charge thereon; developing the selected areas of the OPC layer with a triboelectrically charged, dry-powdered, first color-emitting phosphor; sequentially repeating the charging, exposing and developing sequence for triboelectrically charged, dry-powdered, second and third color-emitting phosphors to form a luminescent screen comprising picture elements of triads of color-emitting phosphors; fixing the phosphors to the underlying OPC layer with a suitable fixative; filming the phosphors; and aluminizing the filmed phosphors. The present method is an improvement over prior methods because the fixing step utilizes an electrostatic spray to uniformly contact the phosphors and the underlying OPC layer with the fixative, without moving the phosphors.

Method of manufacturing a luminescent screen for a CRT

In accordance with the present invention, a method of electro-photographically manufacturing a luminescent screen assembly for a color CRT 10 on an interior surface of a faceplate panel 12 is described. A volatilizable, organic conductive (OC) layer 32 is provided on the interior surface of the panel and a volatilizable, organic photoconductive (OPC) layer 34 overlies the OC layer. The method includes the steps of: establishing a substantially uniform electrostatic charge on the OPC layer; exposing selected areas of the OPC layer to visible light to affect the charge thereon; developing the selected areas of the OPC layer with a triboelectrically charged dry-powdered, screen structure materials; fixing the screen structure materials to the underlying OPC layer with a suitable fixative; filming the screen structure materials; aluminizing the screen; and baking the aluminized screen. The present method is an improvement over prior methods because the relative humidity (RH) during the charging step is maintained above a humidity level below which the performance of the OC layer is negatively impacted by a reduction in its ion transfer mobility which makes it difficult to apply a usable corona charge to the overlying OPC layer, and below a humidity level above which the OC layer swells causing cracking in the OPC layer. Additionally, the RH during the development step is maintained below a humidity above which the screen structure materials can absorb water and macro-agglomerate, thereby changing the charge-to-mass ration of the screen structure materials to a value which adversely affects the deposition thereof.

Method of manufacturing a luminescent screen for a CRT under ambient

The method of electrophotographically manufacturing a screen assembly on an interior surface of a viewing faceplate of a panel for a color CRT, according to the present invention, includes the steps of forming a volatilisable organic conductive layer on the interior surface of the viewing faceplate and overcoating the organic conductive layer with an organic photoconductive solution to form a volatilizable organic photoconductive layer. The conductive solution, comprising a polyelectrolyte and a diluent, is applied to the interior surface of the viewing faceplate by spraying, to form the conductive layer.

Method of spray-depositing an organic conductor to make a screen

A solution for making a wear-resistant conductive contact patch for a faceplate panel of a color CRT which facilitates the electrophotographic manufacturing of a luminescent screen on the panel consists essentially of, in weight percent, solvent 22 to 70, conductive material 62 to 21, and the balance being other compatible additives.

Conductive contact patch for a CRT faceplate panel

The method of electrophotographically manufacturing a luminescent screen on a substrate of a color CRT, according to the present invention, includes the steps of forming a photoreceptor by sequentially coating the substrate to form a conductive layer and an overcoating of a photoconductive layer, establishing an electrostatic charge on the photoconductive layer, and exposing selected areas of the photoconductive layer to visible light to affect the charge thereon. Then the photoconductive layer is developed by the application of suitable triboelectrically charged, dry-powdered screen structure materials. The improved process provides at least one wear-resistant, conductive contact patch on a peripheral portion of a surface of the substrate. The contact patch has a first portion which underlies at least one of the layers of the photoreceptor and is in electrical contact with the conductive layer, and a second portion which extends from the photoreceptor. The contact patch is utilized during the manufacturing process to electrically ground the conductive layer during charging of the photoconductive layer. The contact patch also is utilized to measure the charge on the photoconductive layer during the developing process. Additionally, the contact patch provides an electrical contact, in the finished tube, between an aluminized layer on the screen and at least one support for a shadow mask.

Method of electrophotographically manufacturing a luminescent screen for

The method of electrophotographically manufacturing a luminescent screen assembly on a substrate for use within a CRT, according to the present invention, includes the steps of: forming a conductive layer on the substrate; overcoating the conductive layer with a photoconductive solution comprising an organic polymeric material, a suitable photoconductive dye, a plasticizer and a solvent to form a photoconductive layer; and, then, establishing an electrostatic charge on the photoconductive layer. Selected areas of the photoconductive layer are exposed to visible light to affect the charge thereon, and the photoconductive layer is developed with charged screen structure material. The improved method utilizes a dialkyl phthalate plasticizer which is selected from the group consisting of dibutylphthalate (DBP), dioctylphthalate (DOP), and diundecylphthalate (DUP).

Method of electrophotographically manufacturing a luminescent screen

In accordance with the present invention, a method of manufacturing a luminescent screen assembly on a substrate of a CRT includes the steps of providing a coating of a non-luminescent screen structure material in a predetermined pattern on the substrate and depositing a plurality of color-emitting screen structure materials on the substrate. The color-emitting screen structure materials are surrounded by the non-luminescent material. An electrostatically-charged dry-powdered resin is deposited onto the aforementioned color-emitting and non-luminescent screen structure materials and fused to form a substantially continuous film.

Method of manufacturing a luminescent screen assembly using a

The method of electrophotographically manufacturing a luminescent screen assembly on a substrate of a CRT, according to the present invention, includes the steps of coating the substrate with a conductive layer and overcoating the conductive layer with a photoconductive layer, establishing an electrostatic charge on the photoconductive layer, and exposing selected areas of the photoconductive layer to visible light to affect the charge thereon. Then, the selected areas of the photoconductive layer are developed with triboelectrically charged, dry-powdered, surface-treated screen structure materials. The improved process increases the adherence of the surface-treated materials to the photoconductive layer by contacting the surface-treated materials with a solvent to render the photoconductive layer and the materials tacky. The dried screen is fixed with a plurality of coatings of an aqueous alcohol mixture of dichromated polyvinyl alcohol or potassium silicate and then filmed, aluminized and baked to form the screen assembly.

Growing community of inventors

Adamstown, PA, United States of America

Harry R Stork