For Plural Phosphor Target Tube Patents (Class 315/375)
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Patent number: 11051380Abstract: A driver for a lighting module has driver inputs for receiving a supply voltage from an electronic control gear (ECG) and driver outputs for supplying power to the light-emitting element. The driver also has a ring choke converter (RCC) control circuit with a power switching transistor and with a transformer for supplying power to the driver outputs. The power switching transistor is adapted to control power supplied to the transformer. Coupled to the RCC control circuit, the driver furthermore has a feedback circuit. The feedback circuit is adapted to stabilize the power provided to the light-emitting element.Type: GrantFiled: April 8, 2019Date of Patent: June 29, 2021Assignee: LEDVANCE GMBHInventor: ShiYu Ding
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Patent number: 8420416Abstract: In the present invention, disclosed is a method of manufacturing an organic electroluminescent element in which at least an anode, a light emission layer and a cathode are laminated, wherein at least one light emission layer possesses two kinds of light-emitting dopants, the method comprising the step of conducting a process in which the organic EL element is subjected to an annealing treatment after forming at least the anode, the at least one light emission layer and the cathode as an element structure. By the method of the present invention, a stably manufacturable organic electroluminescent element exhibiting high light emission efficiency and long lifetime is possible to be prepared, and a white light-emitting organic electroluminescent element is suitably prepared.Type: GrantFiled: June 24, 2009Date of Patent: April 16, 2013Assignee: Konica Minolta Holdings, Inc.Inventors: Mitsuyoshi Naito, Tomoyuki Nakayama
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Patent number: 6870331Abstract: In a cathode ray tube, plural electron beams are directed towards a faceplate biased at screen potential and are magnetically scanned by a non-self-converging deflection yoke across the faceplate to impinge upon phosphors thereon to produce light depicting an image. The plural electron beams are substantially converged near two opposing edges of the faceplate. A processor changes the raster of the image from a first raster corresponding to position of the image to a second raster corresponding to the position of the plural electron beams on the faceplate. One or more electrodes between the tube neck and the faceplate are biased above and/or below screen potential to deflect electrons landing near the periphery of the faceplate.Type: GrantFiled: May 16, 2001Date of Patent: March 22, 2005Assignees: Sarnoff Corporation, Orion Electric Company, LTDInventors: Dennis J. Bechis, David A. New, Joseph M. Carpinelli, Charles M. Wine, Michael A. Isnardi
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Publication number: 20040212328Abstract: A shadow mask is formed by lapping a main mask and an auxiliary mask on each other. The auxiliary mask includes a porous portion having electron beam passage holes, nonporous portions situated individually at the opposite ends of the porous portion, a pair of skirt portions extending individually from the nonporous portions and lapped on the skirt portion of the main mask, and second beads formed individually on the skirt portions and overlapping first beads of the main mask. The height or width of the first beads and the second beads in a superposed portion in which the main mask and the auxiliary mask are lapped on each other is differentiated from that of the beads in non-superposed portions outside the superposed portion.Type: ApplicationFiled: January 22, 2004Publication date: October 28, 2004Inventors: Takeshi Nakayama, Takuya Mashimo, Tohru Takahashi, Hiroyuki Oda
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Patent number: 6369512Abstract: A projection tube has a phosphor-coated faceplate at one end of a vacuum envelope and a plural-beam providing electron lens structure at the opposite end thereof. The electron lens structure includes four electrodes having axially-aligned apertures defining parallel channels for the plural electron beams to pass through to be focused and converged onto a small spot on the faceplate. The first and second electrodes of the electron lens structure shape the electron beams and the third and fourth electrodes thereof converge and focus the electron beams toward the same location on the faceplate. The potential applied to the fourth electrode is at or close to the potential at the phosphor, and is substantially higher than the potential applied to the third electrode. The lens structures of the third and fourth electrodes may each include an inner electron lens structure and an outer electron lens structure.Type: GrantFiled: October 4, 1999Date of Patent: April 9, 2002Assignee: Sarnoff CorporationInventors: Roger Casanova Alig, Dennis John Bechis
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Publication number: 20010011874Abstract: A plasma display panel includes a front glass substrate, a rear glass substrate, address electrode lines, a first dielectric layer, scan electrode lines, a second dielectric layer, phosphor layers, Y-common electrode lines and X-common electrode lines. The front glass substrate and a rear glass substrate are opposite to and spaced apart from each other. The address electrode lines are formed on the front surface of the rear glass substrate in parallel. The first dielectric layer is formed in front of the address electrode lines. The scan electrode lines are arranged in front of the first dielectric layer to be perpendicular to the address electrode lines to define discharge cells at intersections. The second dielectric layer is formed in front of the scan electrode lines. The phosphor layers are formed in front of the second dielectric layer to be parallel with the address electrode lines.Type: ApplicationFiled: February 8, 2001Publication date: August 9, 2001Inventor: Yoon-phil Eo
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Publication number: 20010010450Abstract: A built-in resistor for cathode-ray tube which comprises an insulating substrate, a resistance layer formed on one main surface of the insulating substrate, a plurality of terminal electrodes mounted on the resistance layer, and a plurality of terminals connected respectively with the terminal electrodes, wherein the plurality of terminals are individually constituted by a base body made of a non-magnetic alloy, and by a surface layer which is formed on the surface of the base body and made of an oxide of the non-magnetic alloy, the plurality of terminals have a relative permeability of not more than 1.005, and the surface layer of each of the terminals is partially provided with an insulating covering layer. The nonmagnetic alloy is a Ni—Cr-based alloy, and the surface layer is formed through an oxidation treatment under a condition where the formation of NiO can be suppressed.Type: ApplicationFiled: February 16, 2001Publication date: August 2, 2001Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masao Irikura, Aiko Takemoto, Suejiro Iwata
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Publication number: 20010006329Abstract: In a fluorescent display device having control electrodes and anodes, each anode having an anode electrode and a fluorescent layer formed thereon, a filament is installed between the control electrodes and the anode electrodes. When an anode is selected to be turned on to emit light, a first voltage (V1) is applied to the filament, a second voltage (V2) is applied to the selected anode and a third voltage (V3) is applied to a control electrode facing the selected anode, wherein V2 is greater than V1 and V3 is equal to or greater than V1. When a voltage applied to a target control electrode is lower than a voltage applied to the filament by more than a predetermined voltage difference, an anode facing the target control electrode is not turned on to emit light even when V2 is applied thereto.Type: ApplicationFiled: December 13, 2000Publication date: July 5, 2001Applicant: Futaba Denshi Kogyo Kabushiki KaishaInventors: Hiroaki Kawasaki, Yukio Ogawa
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Patent number: 6054817Abstract: The present invention relates to improvements in a three-dimensional display system. A transformation technique is described wherein deflection coordinates defining the spatial locations of the images written into the display volume are determined by transformation from a coordinate system based on the display volume to a coordinate system based on the one or more electron guns. The application further relates to a technique by which the location of an electron beam within the display volume may be determined. These techniques involve positioning conductive material at various locations such as the screen and the enclosure of the display itself so that the impinging electron beam may be detected and thy the location of the beam in the display volume may be derived. Image enhancing techniques are described in conjunction with the location techniques whereby conductive films are evaporated onto the screen and/or the enclosure.Type: GrantFiled: February 2, 1998Date of Patent: April 25, 2000Inventor: Barry George Blundell
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Patent number: 5065077Abstract: The color monitor has a cathode-ray tube adapted to generate a single electron beam with different energy levels depending on the primary color to be displayed on a screen which has at least one layer of electroluminescent material, and a control circuit for the sequential display of the primary colors. The cathode-ray tube defines a capacitor charged to voltages which differ in value according to the color to be displayed. Generators are provided which are adapted to generate an overcurrent in the capacitor and to cause its rapid discharge at the end of the display of the color signal with higher energy.Type: GrantFiled: July 23, 1990Date of Patent: November 12, 1991Inventor: Salvatore Pranzo
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Patent number: 4977447Abstract: A color cathode ray tube (CRT) arrangement utilizing only a single electron gun. A single electron beam, emitted from the single gun, is deflected in such a manner as to simulate the three electron beams that would normally be provided by three separate electron guns in a conventional CRT arrangement. The single electron beam is electrostatically deflected by electrodes according to a three stage cycle to simulate three electron beams directed in different directions. The simulated electron beams are deflected by a supplemental coil to correct for convergence error. The three electron beams are deflected by the main deflection coils of the tube's yoke and then pass through apertures of the tube's shadow mask to impinge on phosphor stripes of a screen formed on a face plate of the tube.Type: GrantFiled: August 28, 1989Date of Patent: December 11, 1990Assignee: Kabushiki Kaisha ToshibaInventors: Shigeo Takenaka, Eiji Kamohara, Takashi Nishimura
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Patent number: 4687974Abstract: In a method for scanning a color fiber optic tube of an electron gun type in which a screen is formed by a plurality of band-shaped phosphors providing different illuminant colors, usually red, green and blue, respectively, an electron beam from the electron gun is deflected vertically in a lateral direction of the phosphors and horizontally in a longitudinal direction thereof. The vertical deflection of the electron beam is time controlled in response to the sensitivity of a photo-sensitive material disposed to the fiber optic tube. In another aspect, the horizontal deflection is performed by a stepped method in which the horizontal deflection is stopped during a time interval when one raster of the vertical deflection of the electron beam crosses the phosphors and progresses stepwisely when the vertical deflection is subsequently transferred to the next raster.Type: GrantFiled: November 14, 1984Date of Patent: August 18, 1987Assignee: Fuji Photo Film Co., Ltd.Inventor: Tadashi Miyakawa
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Patent number: 4660076Abstract: A display apparatus which comprises a display tube having a channel plate electron multiplier and a penetron screen having an electrode (hereinafter termed the screen electrode) thereon by which an accelerating field is provided between the electron multiplier and the screen. In order to obtain rapid switching of the voltage applied to the screen electrode, a high voltage power supply has a thermionic valve included within the display tube envelope to shunt current to ground when switching from a high voltage to a low voltage. The anode and cathode of the valve are connected respectively to the screen electrode and the electron gun cathode. The valve may be a triode or tetrode. A feedback arrangement is provided which causes the voltage on the screen electrode to remain substantially constant in spite of variations in screen current.Type: GrantFiled: April 11, 1984Date of Patent: April 21, 1987Assignee: U.S. Philips CorporationInventors: Alan G. Knapp, Harold W. Ellis
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Patent number: 4488093Abstract: A color shadow mask cathode ray tube has arrays of three phosphors deposited on the back of its faceplate. The color radiated by one of the phosphors corresponds to that which is produced when the colors radiated by the other two phosphors are combined.Type: GrantFiled: October 1, 1982Date of Patent: December 11, 1984Assignee: Tektronix, Inc.Inventors: Doug Haines, Keith Taylor, Murlan Kaufman
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Patent number: 4476485Abstract: A high voltage color switch for a beam penetration CRT includes a constant current driver which provides a bias current to the high voltage transformer in the first color write period when the baseline color is being displayed. One or more secondary colors can be displayed during a second color write period during which a switch connects the transformer to a conventional voltage driver that provides the needed voltage swing. At the end of a secondary color write period the constant current driver is again connected to reset the flux level in the transformer to one end of its dynamic range. During a core reset interval only a small voltage offset appears on the anode of the CRT so that color information written in the baseline color appears without any perceivable change to a viewer. At the end of the core reset period the constant current source continues to supply a constant bias current to the primary winding of the transformer to maintain the flux level at one end of its dynamic range.Type: GrantFiled: May 1, 1981Date of Patent: October 9, 1984Assignee: United Technologies CorporationInventor: Michael H. Kalmanash
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Patent number: 4468691Abstract: A high voltage color switch for a beam penetration CRT is well suited to generating a color write in one or more random colors during the retrace interval of a TV raster scan, or the like. The scanning period of the TV raster is in the baseline color for maximum resolution and brightness. A driver connected to the high voltage transformer includes a low voltage power supply which has one portion controlled by a switch. During the color write period the switch is closed so that the driver can provide a suitable waveform to the transformer to obtain the required swing. During the raster scan, the switch is open so that the magnetizing current in the transformer can be reset over the entire TV raster scan interval causing only a slight offset in the baseline color.Type: GrantFiled: May 1, 1981Date of Patent: August 28, 1984Assignee: United Technologies CorporationInventor: Michael H. Kalmanash
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Patent number: 4450387Abstract: The magnitude of a DC high voltage supplied to an internal element of a CRT is varied by a thermionic valve that is located within the envelope of the CRT and that forms a voltage divider with an external load resistor. Only a small scale signal referenced near ground is needed to produce a several thousand volt change in the high voltage supplied to the internal CRT element. The variable high voltage may control a variable deflection factor, variable spot size, or in the case of a beam penetration CRT, either variable persistence or variable trace color. In a particular beam penetration color CRT having a split anode the thermionic valve comprises a tetrode flood gun coupled by an electron mirror to a plate region in the neck of the CRT.Type: GrantFiled: March 30, 1981Date of Patent: May 22, 1984Assignee: Hewlett-Packard CompanyInventors: Ronald G. Reed, Robin R. Schmuckal, Robert K. McCullough
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Patent number: 4430667Abstract: A color display system that employs a penetration type CRT, a control circuit and storage elements for holding the information to be displayed to obtain multicolored rastered images is described. The CRT is capable of exhibiting a predetermined number of colors. The storage elements hold information that defines one frame for each displayable CRT color screen. The control circuit supplies appropriate video and drive signals for each color frame to be displayed, at the proper time and sequence, to the CRT. In particular, the control circuit is adapted to provide drive signals for horizontal and vertical electron beam deflection circuits that cause the beam to be scanned, both horizontally and vertically, at a rate that is a multiple of the predetermined number of colors to be displayed and the conventional scan rate for horizontal and vertical deflection.Type: GrantFiled: January 4, 1982Date of Patent: February 7, 1984Assignee: International Business Machines CorporationInventor: Kevin J. Gorga
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Patent number: 4406977Abstract: A power supply circuit is provided with a voltage control circuit (1) with negative feedback for applying a rapidly changing high voltage to the anode of a penetron-type cathode ray tube (3) for a color display system and with a deflection voltage correcting unit (5) for obtaining color-independent pictures on the screen of the cathode ray tube. The deflection voltage correcting unit is controlled by at least a correction signal derived from an input voltage of the voltage control circuit.Type: GrantFiled: December 4, 1980Date of Patent: September 27, 1983Assignee: Hollandse Signaalapparaten B.V.Inventor: Hubert J. Ploumen
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Patent number: 4358688Abstract: Two identical variable voltage source include respective capacitors serially interconnected across a series combination of a capacitive load and a fixed voltage source. Each variable source further includes a commutation reactor having two windings electromagnetically coupled and connected to each other, and two thyristors connected across the capacitor through one of the reactor windings to invert a voltage across the capacitor from its positive to its negative polarity and vice versa respectively. Either one of two low impedance DC sources charges the capacitor through a mating thyristor and the other reactor winding.Type: GrantFiled: October 8, 1980Date of Patent: November 9, 1982Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Seizo Tamii
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Patent number: 4356434Abstract: A single electron gun cathode ray tube for producing color pictures comprising three types of small bodies or beads affixed on the inner surface of the viewing end of the tube. The beads of the three types have phosphors associated with them to produce red, green and blue light respectively. A tuned tank circuit is associated with each bead and comprises opposite capacitor plates connected by an inductor extending through the bead for causing the bead and its phosphor to be excited at a certain frequency of electron flow from the electron gun of the tube, so that three different frequencies of electron flow cause the three different types of beads to produce red, green and blue light emissions respectively.Type: GrantFiled: March 12, 1981Date of Patent: October 26, 1982Inventor: Keith T. Bleuer
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Patent number: 4356435Abstract: A color switch for a beam penetration CRT includes a return path through a pair of reverse biased diodes to recapture a substantial amount of the energy associated with changing the voltage on the anode of the CRT for a write period in a non-baseline color. A driver circuit, which includes the low voltage power supply, is connected through a switch to one end of the primary winding of a transformer. The primary winding is also connected through one of two diodes to each half of the low voltage power supply for the driver. By opening the switch at the end of a color write period in a non-baseline color, the rapid decrease in the current through the primary winding of the transformer to restore DC balance of the magnetizing current in the transformer core forms a reverse voltage which is returned to the low voltage power supply through the diodes.Type: GrantFiled: May 1, 1981Date of Patent: October 26, 1982Assignee: United Technologies CorporationInventor: Michael H. Kalmanash
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Patent number: 4337421Abstract: An improved sequential color switch for a beam penetration CRT includes a high voltage power supply and a high voltage transformer. A feedback circuit senses the DC level in the signal waveform applied to the transformer and feeds it back to the input of a driver. A low-pass filter connected to the input of the driver also senses the DC level in the signal waveform applied to the driver and adjusts the reference input of the high voltage power supply to correspondingly change its DC high voltage output level. Essentially, this removes any DC level from the primary winding of the high voltage transformer while at the same time adjusting the output level of the high voltage power supply connected to the secondary winding of the transformer by an amount which is proportional to the average DC level of the input signal waveform.Type: GrantFiled: May 1, 1981Date of Patent: June 29, 1982Assignee: United Technologies CorporationInventor: Michael H. Kalmanash
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Patent number: 4337420Abstract: A high voltage color switch for beam penetration CRT has two operating modes, the first of which is well suited to displaying a sequential group of colors on the faceplate of a CRT, and the second mode of which is well suited to displaying a random color that varies from a preselected baseline color. A high voltage power supply has an output voltage level which is selected to provide a predetermined baseline color when presented through the secondary winding of a transformer to the anode of a CRT. The primary winding of the transformer is connected through a first switch to the output of a driver. A feedback loop from the output of the driver senses the DC voltage level associated with the input waveform and biases the input of the driver to force the level of DC voltage presented to the primary winding of the transformer to zero.Type: GrantFiled: May 1, 1981Date of Patent: June 29, 1982Assignee: United Technologies CorporationInventor: Michael H. Kalmanash
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Patent number: 4316126Abstract: CPT comprises a deflection-and-focus color-selection masking structure, a screen of parallel phosphor stripes, and means for producing three convergent in-line electron beams directed towards the target. When the CPT is operated, pairs of beamlets transmitted through windows in adjacent apertures in the masking structure are deflected towards one another to excite the same phosphor stripe and, also, are focused (compressed) in the narrow width direction of the phosphor stripes and defocused (stretched) in the length direction of the phosphor stripes.Type: GrantFiled: November 23, 1979Date of Patent: February 16, 1982Assignee: RCA CorporationInventors: Eric F. Hockings, Carmen A. Catanese
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Patent number: 4311944Abstract: A CRT comprises a deflection-and-focus color-selection masking structure, a screen of parallel phosphor stripes, and means for producing three convergent in-line electron beams directed towards the target. The masking structure comprises a metal masking plate having two major surfaces and having therein an array of apertures arranged in columns that are substantially parallel to the phosphor stripes. Arrays of narrow conductors are insulatingly supported in opposed positions on each major surface of said plate. The conductors extend substantially parallel to the stripes and are located in every other space between the columns.Type: GrantFiled: June 27, 1980Date of Patent: January 19, 1982Assignee: RCA CorporationInventors: Stanley Bloom, Carmen A. Catanese
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Patent number: 4297618Abstract: A compensating gain control system provides improved operation of the deflection channels of cathode ray color displays, particularly a display of the penetration phosphor type. A sample of the indicator anode voltage is taken and the square root of the sample is derived. Each deflection current wave form is multiplied by the square root signal, thus providing a deflection drive current accurately scaled to anode voltage changes.Type: GrantFiled: September 15, 1980Date of Patent: October 27, 1981Assignee: Sperry CorporationInventor: Thomas W. Spilsbury
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Patent number: 4284928Abstract: A power supply designed primarily for polychrome cathode-ray tubes of the penetration type and capable of switchover to three and/or four levels comprises a main high-voltage source and one or more auxiliary sources having lower rated voltage values, the auxiliary source or sources being combined with the main source by means of a set of switches according to the total value of voltage to be applied to the polychrome cathode-ray tube in order to obtain a predetermined color. A circuit for recovering the switching energy is associated with the four-level supply system.Type: GrantFiled: September 5, 1979Date of Patent: August 18, 1981Assignee: Thomson-CSFInventor: Claude Ragot
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Patent number: 4281272Abstract: An efficient switching power supply provides power for penetration phosphor cathode ray tube color displays employing rapidly selectable high voltages for anode or acceleration electrodes. The apparatus employs a serially connected command decoder, a voltage regulator, a power oscillator, and a voltage multiplier along with an output voltage divider for supplying a fed back voltage to the regulator for comparison purposes. Positive transitions of the high voltage output are directly accomplished in the power oscillator-voltage multiplier serving as a unidirectional voltage to unidirectional voltage converter. The apparatus is further supplied with a signal lever detector responsive to the voltage regulator and employing a switching oscillator to control the conductivity state of a pull down switch coupled in shunt with respect to the anode voltage line.Type: GrantFiled: January 21, 1980Date of Patent: July 28, 1981Assignee: Sperry CorporationInventor: Thomas W. Spilsbury
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Patent number: 4278917Abstract: A driving circuit for fluorescent display device capable of displaying letters, figures, symbols or the like in multiple luminous colors with a constant brightness is disclosed. The driving circuit comprises a voltage controlling means for controlling an output voltage in response to inputs to be displayed in the device, a pulse generating means for generating a pulse signal having the peak value which is regulated by the voltage level of the voltage controlling means and having the pulse width which is regulated by the input to be displayed in the device, and a driving means for driving the fluorescent display device in response to the output of the pulse generating means.Type: GrantFiled: September 28, 1979Date of Patent: July 14, 1981Assignee: Futaba Denshi Kogyo K.K.Inventor: Youichi Kobori
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Patent number: 4223252Abstract: A deflection amplifier gain correction circuit for a beam penetration color cathode ray tube having a split high voltage anode in which the deflection waveform is shaped as a non-linear function of the final anode voltage and as a function of a dynamic focus waveform used for the electrostatic focussing system in the cathode ray tube. The shape of the correcting waveform is adjusted by adjusting the amounts of the dynamic focus waveform and the anode switching voltage waveform which are multiplied to produce a resulting waveform which varies as a function of deflection position and anode voltage and is summed with a waveform which is a non-linear function of anode voltage. Such a system can be adjusted for each individual display unit to compensate for production variations in a color penetration tube using two different colored phosphors.Type: GrantFiled: May 7, 1979Date of Patent: September 16, 1980Assignee: Raytheon CompanyInventor: Robert W. Doran
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Patent number: 4203055Abstract: A high voltage power supply system particularly adapted for rapid switching of high voltage applied to an anode of a beam penetration color cathode-ray tube. Energy for making the rapid transition between voltage levels is stored in two energy storage inductors, one for upward transitions and the other for downward transitions. When it is desired to change the voltage applied to the cathode-ray tube, the appropriate one of the storage inductors is coupled through a controlled switch to the anode causing the voltage applied to the anode to change at a rapid rate. The voltage rises until the desired voltage level corresponding to a desired output color is reached at which time the switch is turned off and the storage inductor recharged. A tracking high voltage supply maintains the anode at the predetermined voltage level once that level has been reached.Type: GrantFiled: February 27, 1978Date of Patent: May 13, 1980Assignee: Raytheon CompanyInventors: Derek Chambers, Hugh C. Masterman
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Patent number: 4095144Abstract: A color cathode ray tube (CRT) provides excitation of a plurality of noncontiguous picture elements disposed substantially in a matrix configuration of rows and columns on the inside surface of a video screen formation included within the tube, with a hollow electron beam provided by a modulatable, hollow beam electron gun assembly within the tube, each picture element including a plurality of different color phosphors deposited in a determined concentric geometric pattern, the screen formation further including a high work function dielectric material disposed interposingly with the picture elements of the matrix configuration for providing a negative electrostatic field gradient in a direction opposite to that of the incident hollow electron beam horizontally deflected across the screen by a deflection circuit, to cause registration of the beam with each successive picture element and to cause, in combination with the deflection circuit, the beam to step from the center of one picture element to the centerType: GrantFiled: December 17, 1976Date of Patent: June 13, 1978Assignee: United Technologies CorporationInventor: Charles Mendelsohn
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Patent number: 4092566Abstract: A high voltage power supply system particularly adapted for rapid switching of high voltage applied to an anode of a beam penetration color cathode-ray tube. Energy for making the rapid transition between voltage levels is stored in two energy storage inductors, one for upward transitions and the other for downward transitions. When it is desired to change the voltage applied to the cathode-ray tube, the appropriate one of the storage inductors is coupled through a controlled switch to the anode causing the voltage applied to the anode to change at a rapid rate. The voltage rises until the desired voltage level corresponding to a desired output color is reached at which time the switch is turned off and the storage inductor recharged. A tracking high voltage supply maintains the anode at the predetermined voltage level once that level has been reached.Type: GrantFiled: January 13, 1977Date of Patent: May 30, 1978Assignee: Raytheon CompanyInventors: Derek Chambers, Hugh C. Masterman
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Patent number: 4059781Abstract: A post-focusing type color cathode ray tube comprising a quadrupole lens formed in each aperture of the color selection mask.Type: GrantFiled: March 22, 1977Date of Patent: November 22, 1977Assignee: U.S. Philips CorporationInventors: Willem Meijndert VAN Alphen, Jan Verweel
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Patent number: 3992647Abstract: A system for compensating for mislanding of electron beams in a color cathode ray tube, which comprises a coil device provided on the color cathode ray tube in addition to a main deflection coil, a circuit for producing a plurality of currents having different wave forms, respectively, and a connecting device for connecting the coil device to selected one of connection points of the circuit so as to supply one or more of the currents produced in the circuit, which has a desired wave form, to said coil device selectively in response to the direction to which the color cathode ray tube faces, thereby to achieve sufficient compensation for mislanding of electron beams caused by the earth's magnetic field regardless of the directional situation of the cathode ray tube.Type: GrantFiled: February 21, 1975Date of Patent: November 16, 1976Assignee: Sony CorporationInventors: Mitsuyoshi Yamada, Hideo Hatada, Masato Izumisawa, Hiromasa Machida, Norihide Furuyama