Abstract: An apparatus (38) for rapidly and uniformly electrostatically charging a photoconductive layer (34) disposed on a conductive layer (32) provided on an interior concave surface of a viewing faceplate (18) of a CRT faceplate panel (12) is disclosed. The apparatus includes a housing (40) having a faceplate panel support surface (42), an electrical contact (52) for grounding the conductive layer, a corona charger (48), and power supplies (200, 204) for corona charging. The corona charger (48) includes a charging head (46) that substantially conforms to the contour of the interior concave surface of the viewing faceplate (18). The charging head comprises a base plate (54) having a mounting surface (56) to which a plurality of discrete charging modules (82) are attached. Each of the charging modules includes a focusing blade (86) and a charging blade (88, 188) insulated from the focusing blade. An ultimate focusing blade (186) is attached to the ultimate discrete charging module.

Abstract: The present invention relates to a method for pre-stressing the CRT tension mask 24 to induce creep. The method includes the steps of applying a suitable force to the mask material to induce stress therein, heating the mask material to an ultimate temperature, for a sufficient time, while under stress, to induce creep, and cooling the material.

Abstract: The present invention relates to an apparatus 50 for pre-stressing a material of a CRT tension mask 24 to induce creep. The apparatus 50 includes a support frame 52 having a first major surface 54 and an oppositely disposed second major surface 56. A boss 58 is provided on the first major surface 54. A primary clamp 60 having a first jaw 62 is spaced from the boss 58 and attached to the first major surface 54. The primary clamp 60 further includes an adjustable second jaw 64 communicating with the first jaw 62 to clamp the material of the mask 24 therebetween. A movable secondary clamp 70 is located in proximity to the boss 58. The secondary clamp 70 has a third jaw 72 attached to an axle 74 that is disposed within an elongated aperture 82 formed in a support post 84 attached to the support frame 52. An adjustable fourth jaw 86 communicates with the third jaw 72 to clamp the mask material therebetween. A cam 78 having a boss engaging surface 90 is secured to the axle 74.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: In a method of reproducing a television picture composed of picture points represented by digital signals, the picture points are grouped into blocks which are separated by block edges. The blocks are one of at least two types of blocks, picture point values for points in one type of block are calculated using one set of rules and picture point values for another type of block are calculated using another set of rules. Values for picture points within the block edges are obtained by combining the values obtained for the respective blocks.

Abstract: In accordance with the present invention, a method of electrophotographically manufacturing a luminescent screen assembly on a photoreceptor disposed on an interior surface of a faceplate panel for a color CRT includes the steps of: charging the photoreceptor to establish a substantially uniform electrostatic voltage thereon; positioning the panel on an exposure device having a light source therein; exposing selected areas of the photoreceptor to visible light from the light source to affect the voltage thereon, without affecting the voltage on the unexposed area of the photoreceptor; and depositing a triboelectrically charged, first color-emitting phosphor onto the selected areas of the photoreceptor. The charging, positioning, exposing and depositing steps are repeated for a second and a third triboelectrically charged, color-emitting phosphor.

Abstract: In accordance with the present invention, a method of electrophotographically manufacturing a luminescent screen assembly on an interior surface of a faceplate panel 12 of a color CRT 10 comprises the steps of coating the interior surface of the panel with a volatilizable, organic conductive material to form an organic conductive (OC) layer 32, and overcoating the OC layer 32 with a volatilizable, photoconductive material to form an organic photoconductive (OPC) layer 34. Then, a substantially uniform voltage is established on the OPC layer 34, and selected areas of the OPC layer 34 are exposed to visible light to affect the voltage thereon, without affecting the voltage on the unexposed area of the OPC layer 34. Next, triboelectrically charged, light-absorbing screen structure material is deposited onto the unexposed area of the OPC layer 34 to form a substantially continuous matrix 23 of light-absorbing material having open areas therein.

Abstract: An improved color picture tube includes a screen and an inline gun for generating and directing three inline electron beams along separate paths toward the screen. The electron gun includes electrodes that provide a beam-forming region, a prefocus region and a main focus region. The beam-forming region of the gun includes a cathode, a G1 electrode, a G2 electrode and a first portion of a G3 electrode. The prefocus region includes a second portion of the G3 electrode, a G4 electrode and a first portion of a G5 electrode. The main focus region includes a second portion of the G5 electrode and a G6 electrode. The improvement resides in the beam-forming region, the prefocus region and the main focus region each being astigmatic.

Abstract: It is known to provide a large screen area using a picture tube having a plurality of guns. The object is to provide a transition of continuous brightness, so that the partial picture transitions are no longer perceptible.This is achieved in that a picture tube without a shadow mask, but with optical sensors, index regions and optical walls is employed, so that a precise detection of the beam is possible and the partial picture transitions are no longer perceptible.Especially for television receivers and monitors.

Abstract: The present invention provides an improved color picture tube having a viewing screen and a shadow mask mounted adjacent to the screen. The mask has an apertured contoured portion and a peripheral skirt. The improvement comprises the skirt having a reverse bend therein, wherein a first portion of the skirt that connects with the apertured contoured portion extends away from the screen and a second portion of the skirt more remote from the apertured contoured portion extends towards the screen.

Abstract: The method of electrophotographically manufacturing a screen assembly on an interior surface of a faceplate panel for a color CRT, according to the present invention includes the step of forming a photoreceptor by sequentially coating the surface of the panel with a conductive solution to form a volatilizable conductive layer and then overcoating the conductive layer with an organic photoconductive solution comprising a suitable resin, an electron donor material, an electron acceptor material, a surfactant and an organic solvent to form a volatilizable photoconductive layer.

Abstract: 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.

Abstract: The invention relates to a method of electrophotographically manufacturing a luminescent screen assembly for a color CRT by utilizing materials whose volatilizable constituents are substantially completely baked-out in the same step in which the faceplate panel is frit sealed to the funnel of the tube envelope. This method eliminates a dedicated panel bake before frit sealing of the panel to the funnel.

Abstract: A device for illuminating an area includes a circular reflector for focussing a light ray from a light source into a beam. A polarizer splits the beam into an effective beam having a first polarization direction and a complimentary beam having a second polarization direction. The polarizer reflects the effective radiation toward the area to be illuminated and transmits the complementary radiation to a rough surface having a roughness at least an order of magnitude greater than the wavelength of the light to diffuse the light and reflect at least a portion of the complementary beam back to the reflector and another portion to the area to be illuminated.

Abstract: An improved color picture tube has a viewing screen, a shadow mask located adjacent to the screen, and an electron gun for generating and directing a plurality of electron beams through the mask to the screen. The mask has a rectangular periphery with two long sides and two short sides. A major axis passes through the center of said mask and parallels the long sides, and a minor axis passes through the center of the mask and parallels the short sides. The mask includes slit-shaped apertures aligned in columns that essentially parallel the minor axis. Adjacent apertures in each column are separated by tie bars in the mask. The beams are scanable over the screen in scanning lines that parallel the major axis. The improvement comprises the length of the apertures, measured in the direction of the minor axis, being approximately equal to a multiple of the center-to-center distance between adjacent scanning lines, measured in the direction of the minor axis.

Abstract: The method of electrophotographically manufacturing a screen assembly on an interior surface of a faceplate panel for a color CRT, according to the present invention, includes the steps of sequentially coating the surface of the panel with a conductive solution to form a volatilizable organic conductive layer and then overcoating the conductive layer with a photoconductive solution to form a volatilizable organic photoconductive layer. The conductive layer, comprising a quaternary ammonium polyelectrolyte and a surfactant, provides an electrode for the photoconductive layer and has improved electrical and physical properties compared to prior conductive layers.

Abstract: A circuit for regulating the color subcarrier amplitude in a video recorder used with a television receiver which employs overscanning of the electron beams for different modes of operation includes a regulating circuit for providing a regulating voltage representative of the amplitude of the color subcarrier. The regulating circuit includes a variable time constant circuit for switching from a short time constant during the overscanning to a long time constant immediately prior to ending the overscanning to change the regulating voltage in response to changes in the time constant. A variable amplifier is responsive to the regulating voltage to regulate the amplification of the color subcarrier in response to changes in the time constant.