Matches 1 - 50 out of 113 1 2 3 >
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7045977 Vertical/horizontal amplitude controller  
The vertical/horizontal amplitude control device for controlling a vertical amplitude and a horizontal amplitude of an image display device for displaying a video signal includes a brightness level...
6903520 Deflection york and CRT device using the deflection york  
Disclosed is a deflection yoke mounted around a glass bulb of a CRT so as to cover a predetermined area of the glass bulb. The predetermined area is where an outer shape of the glass bulb smoothly...
6847176 Apparatus and method for removing horizontal moire in cathode-ray tube monitors  
An apparatus and method for removing horizontal moire of a cathode-ray tube (CRT) monitor system, wherein horizontal moire can be completely removed even when the moire that occurs in an upper...
6577084 High voltage flash detection  
A method and device are described for detecting whether a flash (F) has occurred in the high voltage part of a combined high voltage and horizontal deflection circuit ( 100 ) in an apparatus...
6407518 Moire-reduced color display device including a color cathode ray tube  
A color display device includes a color cathode ray tube having a phosphor screen, a color selection electrode and an electron gun for projecting plural in-line electron beams toward the phosphor...
6369498 Electron gun for addressing secondary emission targets  
A dual-gun, single neck CRT focuses two beams, with significantly differing energies, onto a secondary emission target while maintaining compatibility with a standard fourteen-rotation stem and...
6297600 Blanked dynamic focus power supply transient elimination  
In order to accurately measure a low current bias in an automatic kine bias (AKB) circuit during several video lines that immediately follow vertical retrace, dynamic focus is interrupted by...
6285143 Video display protection circuit  
A grid kick circuit for applying beam cut-off bias to the grid of a kinescope to provide spot burn protection. The circuit includes a first switching circuit having an output coupled to a first...
6204616 CRT driving circuit  
A CRT driving circuit includes a cathode control circuit for controlling a cathode voltage of a CRT on the basis of a video signal created by a video circuit, a power supply circuit for creating a...
6069660 Automatic black level stabilizing apparatus  
An apparatus for automatically stabilizing the black level of a displayed picture when (1) an automatic black level stabilizing function is OFF, (2) black level error occurs between at an ON state...
6034729 Monitor protection system  
A monitor protection system comprise a display power management signaling (DPMS) operating unit for performing a predetermined power control; a horizontal deflection detecting circuit for detecting...
6020693 Method for reducing residual spot in cathode ray tube  
A method is provided for reducing a residual spot on a cathode ray tube when a power supply is turned off. The method is executed by applying a holding voltage being no less than the value of the...
5969762 Video signal driver including a cascode transistor  
A kinescope video driver includes a series connection of a main cascode transistor coupled to a cathode of a cathode ray tube and a video signal amplifying transistor. A second cascode transistor...
5952795 Stabilized high voltage generation circuit for cathode ray tube display apparatus  
A high voltage generation circuit incorporates the horizontal circuit of a cathode ray tube (CRT) monitor. The horizontal circuit comprises a horizontal output transistor, a retrace capacitor...
5920339 Spot killer circuit for a cathode ray tube  
A spot killer circuit for a CRT is capable of thoroughly removing any spot persistence and prevents damage to the fluorescent body of the CRT due to inaccurate horizontal and vertical deflection....
5872603 Analog circuit controller using signals indicative of control voltage and type of control voltage  
An analog circuit controller having fewer signal paths and elements is disclosed herein. A microcomputer has a first D/A converter for generating control voltages variable into a plurality of...
5856730 Scan loss detector  
A display system includes a kinescope. A horizontal scan detector is coupled to a source of a horizontal scan current signal and detects a loss of horizontal scanning. In addition, a vertical scan...
5784106 Brightness uniformity on a display screen  
A method for improving brightness uniformity reduces a decrease of light towards the edges of a display screen (10) of a display tube (1). The extent of the decrease of light particularly depends...
5764002 Over-current protection circuit for use in television horizontal deflection circuits  
A horizontal deflection circuit includes circuitry for protecting the horizontal output transistor from failure due to an over-current condition. The circuitry includes a current detector for...
5682083 Spot removing circuit for a CRT with grid control means  
A spot removing circuit for a display device is disclosed. The spot removing circuit comprises a rectifying and smoothing portion for rectifying and smoothing the voltage outputted from a flyback...
5449984 Cathode ray tube display apparatus  
This specification concerns cathode ray tube display apparatus comprises a cathode ray tube display screen (10). A beam generator (60,30) is provided for generating at least one electron beam in...
5428272 Voltage regulator for CRT electrode supply  
In a horizontal deflection circuit output stage, a retrace pulse voltage is developed in a primary winding of a flyback transformer and transformer-coupled to a secondary winding and rectified for...
5410223 Display device including a black level setting circuit  
Known display devices include a video signal processing circuit with a black level setting circuit. This black level setting circuit measures the black level of the video signal, for example,...
5321339 Protection of cathode ray tubes  
To avoid burn in a scanning cathode ray tube, the address of the scanning spot at each clock period is recorded in a memory. During each frame period, the logarithms of the number of occurrences of...
5300865 Self adjusting blanking signal generator  
A scanning circuit which utilizes blanking pulses between flyback pulses in a display device includes a line blanking circuit which prevents the generation of spurious blanking pulses by ringing in...
5111119 Scan loss detector for cathode ray tube  
An active amplifier is responsive to a vertical parabola voltage developed across a trace or S-shaping capacitor for developing a DC voltage at an increased voltage level than can be obtained by...
5089754 Protection circuit for a cathode ray tube  
A circuit for protecting a cathode ray tube screen from damage by an electron beam includes a semiconductor switch device having an input coupled to a signal related to a deflection signal for the...
5068647 Digital blanker for scanned displays  
A digital blanker for scanned displays is provided which turns off the electron beam on a Cathode Ray Tube whenever the beam is in a pre-defined area on the screen. A high speed analog to digital...
5043639 Video display apparatus with kinescope spot burn protection circuit  
A television receiver includes a kinescope spot burn protection circuit comprising a capacitor coupled between a source of blanking signal and a control grid of the kinescope for applying negative...
5036257 Projection TV deflection loss protection circuit  
A voltage at a control grid of a cathode ray tube is generated at a blanking level to provide beam current blanking when horizontal deflection loss occurs. The control grid voltage at the blanking...
5036260 Self biasing protection arrangement for a cathode ray tube  
A source of kine supply voltage is coupled to a video amplifier that drives a cathode of a cathode ray tube of a projection television receiver via a self biasing diode. When, due to, for example,...
5034665 Deflection loss protection arrangement for a CRT  
Three vertical deflection windings of corresponding three deflection yokes that are mounted on three cathode ray tubes of a projection video are coupled in series through corresponding three...
4990832 Color display system  
The present invention provides an improvement in a color display system. The system includes a cathode-ray tube having an electron gun for generating and directing three electron beams along paths...
4985665 Black level tracking for multiple frequency apparatus  
A video display monitor operable at different horizontal deflection frequencies incorporates a circuit that produces an electron gun control grid potential that compensates for screen grid...
4916365 Color CRT displaying correction circuit  
A color CRT includes a screen to effect display by being illuminated by electron beams and at least one grid for controlling a character of the display on the screen. A horizontal deflection coil...
4792733 Cathode ray tube display arrangements  
A cathode ray tube (CRT) display arrangement including protection means for protecting the screen of the CRT (1) against excessive heating, by the electron beam, e.g. due to failure of the beam...
4791339 Liquid crystal light valve with spatially uniform light transmittance characteristics  
An electrical circuit compensates for spatial variations in the light transmittance of the target surface (45) of an electron beam-addressed liquid crystal light valve (10). Such variations in...
4755726 XY display transition intensifier  
An XY display transition intensifier increases the intensity of an electron beam of a CRT device when the deflection voltages are changing, indicating a transition between dots on the CRT display....
4749919 Shutdown circuit for video monitor  
In a horizontal drive circuit for a video display, means are provided for sensing the horizontal output pulse used to energize the high voltage sweep transformer and, in turn, the electrodes and...
4677351 Circuit for preventing burn-in spots on the picture screen of a visual display  
A circuit for preventing burn-in spots on the picture screen 23 of a visual display 2 comprising an electron beam 19 that is intensity modulated and positioned controlled by way of a deflection...
4647822 Television camera  
A television camera capable of correcting shadings caused by digital registration faculty employed in a multi-tube type color television camera. The television camera comprises differentiating...
4642532 Projection TV deflection loss protection circuit  
A cathode ray tube protection circuit for a projection TV generates a signal which may be used to blank the tubes in response to a loss or reduction in beam deflection. Signals representative of...
4521720 Projection TV CRT burn protection  
A system for preventing phosphor burn in a cathode ray tube (CRT) without a shadow mask such as used in a projection television receiver is disclosed. Horizontal drive circuit failure or the...
4467324 Apparatus and method for printing annotated electrocardial data  
A single-beam CRT printer, used as a validator record of electrocardiographic data played back from a magnetic tape at a much higher speed than the speed at which it was recorded, includes a scan...
4459614 Rotation-free electrical focussing circuit for television image tubes  
Vertical-rate and horizontal-rate sawtooth generators are coupled at a common input to a conventional focus control voltage and then to the centering circuits of an image tube via respective...
4404500 Projection television apparatus  
In projection television apparatus in order to prevent burning of the phosphor screen of at least one of the television projection tubes a display is not produced should there be an interruption or...
4356436 Picture display device  
A picture display device in which velocity modulation of the electron beam is effected with a deflection correction signal derived from the video signal to be displayed. The brightness distribution...
4325009 Device for displaying an analog signal on a display screen  
A device for displaying an analog signal on a display screen which is scanned by means of a line deflection generator and a frame deflection generator. The device comprises a signal processing...
4301472 Video display system with shading circuit for selectively varying intensity of video display  
A control circuit is provided in a video display system that is responsive to the horizontal and vertical deflection signals to produce a shading signal including a plurality of signal components...
4300157 Means for enhancing uniformity in electron beam spot size in television picture tubes  
This disclosure depicts means for providing greater spot size uniformity across the screen of cathode ray picture tubes. A beam-current-control signal is derived from the horizontal scansion...
Matches 1 - 50 out of 113 1 2 3 >