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7141942 |
Digital device for correcting the image formed on the screen of a cathode ray tube
Device for correcting the line and/or frame fields of a deflector for cathode ray tube comprising:
a current sensor for evaluating the value of a line current Il a series of comparators intended...
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6831415 |
Circuit and method of controlling vertical and horizontal screen sizes of cathode ray tube monitor
In a circuit and method of controlling the horizontal and vertical screen sizes of a cathode ray tube (CRT) monitor, the circuit includes a horizontal screen size compensation circuit, an east-west...
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6704056 |
Horizontal deflection circuit and television receiver
A video signal conversion part of a horizontal deflection circuit deletes a prescribed number of horizontal scanning lines from a vertical blanking interval of an input video signal and assigns a...
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6661188 |
Cathode ray tube filament voltage control with a multifrequency deflection scanner
A power supply for a video display tube includes a deflection transformer with a primary winding powered with a scan voltage which has a first value when displaying signal according to a first...
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6654066 |
High-speed flat-panel display interface
A display interface is arranged to processes analog input signals to provide digital output signals. The display interface includes a series of programmable current sources, an input buffer...
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6392369 |
Digital realtime convergence correction circuit and method thereof
A convergence correction circuit including a coordinate unit which sets a predetermined range with first level values according to a screen length; an interval unit which divides the screen length;...
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6359398 |
Method to control CRT phosphor aging
Methods and apparatus are provided for equally aging a cathode ray tube (CRT). A video input terminal is coupled to the CRT and receives an external video signal. Control circuitry is provided,...
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6232904 |
Scanning system for film recorder
A scanning system for a film recorder utilizes multiple digital-to-analog converters (DACs) to produce a linear output for a vertical deflection circuit which drives a vertical yoke circuit for...
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6111371 |
Switch control signal generator
A scan frequency detector is responsive to a horizontal synchronization signal to generate a data signal that is indicative of the horizontal scan frequency. A digital-to-analog (D/A) converter...
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5969655 |
Digital convergence correction device outputting an analog correction signal
A digital convergence correction device converts correction data into serial data by using a parallel/serial converter, and further converts the serial data into an analog correction signal by...
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5793166 |
Image display device comprising a cathode ray tube
An image display device (1) which includes a cathode ray tube is provided with a cathode system (2) for the emission of a plurality of electron beams (3) whereby a phosphor screen (4) is scanned in...
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5771029 |
Side pincushion control apparatus
A side pincushion control apparatus for compensating for a horizontal picture size control voltage and a side pincushion in a monitor. The apparatus compensates for the horizontal picture size...
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5740064 |
Sampling technique for waveform measuring instruments
A new sampling technique for waveform measuring instruments (including methods and circuits for implementing same) comprises the step of processing a series of digital signal samples through a...
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5581163 |
Generator of periodic signals
A periodic signal is produced by counting pulses of a clock during a given period of time. The number of pulses counted is divided by a whole number. A count is then made of the number of pulses of...
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5473223 |
Vertical deflection waveform generating apparatus
A vertical deflection waveform generating apparatus is provided to have a memory in which a function of a vertical deflection waveform is previously stored. The function is a function with an order...
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5389859 |
Display device including a correction circuit for correcting a position error, and correction circuit for use in such a display device
A display device often includes a correction circuit for correcting a position error which is caused by the fact that the deflection signals are not (any longer) in conformity with the video...
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5359265 |
Display apparatus having plural scanning frequencies
A display apparatus for displaying a video image operates with plural horizontal scanning frequencies. The apparatus includes a horizontal scanning frequency oscillator for generating a signal in...
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5355058 |
Horizontal deflection waveform correction circuit
A deflection apparatus comprises a deflection amplifier coupled to a deflection waveform modulation circuit such as a diode modulator. An East-West modulation signal is generated by a digital to...
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5339011 |
Display device
A display device comprising a CRT having a reduced number of components for automatic cutoff adjustment. The device needs an IC having a less number of connection pins. The device adds reference...
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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...
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5294866 |
Raster distortion correcting signal synthesizer
A raster distortion correcting signal synthesizer includes a multiplier, an adder, a memory for storing data and a coefficient, and a controller for controlling the multiplier, adder and memory in...
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5272421 |
Digital image correction device
An image correction device includes a memory (70) for storing correction data, an address generator (15,31) for supplying addresses to the memory, a regulation pattern generator (40), a DA...
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5239243 |
CRT beam deflection system
Disclosed is a system having a memory mapped deflection to control the position of an electron beam within a CRT used to project a color image onto a photographic medium for printing. A horizontal...
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5223768 |
Data display apparatus with function for correcting effect of external magnetic field
A data display apparatus with a function for correcting the effect of external magnetic field including a display, a driving circuit for driving the display, an adjuster for adjusting a display...
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5204589 |
Data signal controlled oscillator for a video display
The free-running frequency of a bus controlled horizontal oscillator is adjusted by programming of a first data signal that is coupled to a digital-to-analog converter. The programming causes the...
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5099179 |
Remote raster/stroke display calibration
A remote registration and calibration system for a hybrid video display. The registration and calibration functions are performed by a computer. Display mounted switches are advantageously...
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5059872 |
Digital convergence correction device
The digital convergence correction device is used for a projection-type television receiver having a Braun tube with an aspherical surface fluorescent screen and a projection lens system with an...
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5013978 |
Compensation arrangement for display systems
A compensation arrangement for a display system that adaptively compensates the display parameters thereof for each pixel position to provide a precise display image that automatically adapts to...
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5012163 |
Method and apparatus for gamma correcting pixel value data in a computer graphics system
Methods and apparatus for providing pixel brightness correction in monitors. The methods and apparatus disclosed herein provide significant cost reductions in gamma correction circuitry by first...
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5010284 |
Device for the optical recording of rapid processes with a TV camera
The invention relates to a device for the optical recording of rapid proceses with a TV camera, which comprises means for deviating and suppressing the beam, in order to make the scanning beam run...
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4980614 |
Convergence correction circuit
A convergence correction circuit according to the present invention has a phased locked loop including a programmable counter. The programmable counter has programmable count start and end points....
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4970442 |
Correction circuit used in horizontal deflection circuit for the correction of image distortion
A correction circuit is used with a horizontal deflection circuit, for the correction of an image distortion. The correction circuit comprises a line memory for sequentially fetching and storing...
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4933769 |
Picture display device including a staircase generator
A picture display device includes a generator for generating a periodical staircase-shaped signal for addressing picture elements on display screen. The initial value of the staircase shape is...
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4874992 |
Closed loop adaptive raster deflection signal generator
A raster deflection signal generator that generates deflection signals in accordance with sweep control signals provided by a programmable timing generator. The programmable timing generator stores...
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4870329 |
Digital convergence circuit storing coefficients of fundamental waves of correction data
A digital conversion circuit with a convergence deviation correcting circuit. A coefficient storing circuit stores coefficients of fundamental correction waves. By weighting these fundamental...
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4868465 |
Sweep generator error characterization
A delay time between the start of a trace on an oscilloscope screen and a point along the trace is computed based on measured "sweep gain" and "sweep start" parameters characterizing a triggered...
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4812717 |
Sweep circuit for oscilloscope
The oscilloscope sweeping circuit includes a first D/A converter which converts sweep rate step digital data into a charge current under the weighting of a reference current applied thereto. The...
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4802098 |
Digital bandpass oscilloscope
A digital bandpass oscilloscope permits an operator to observe both time and frequency domain plots of analog signal components of frequency within a passband of selected center frequency during a...
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4801851 |
Oscilloscope memory control
A memory control for use with a digital oscilloscope having a display and a digital memory storing a sequence of signal samples. The sequence of signal samples is cyclically read from memory and...
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4799000 |
Display control apparatus
Horizontal and vertical deflection windings in a deflection yoke coil assembly of a CRT (cathode ray tube) having stroke written or raster scan displays are driven by x and y analog deflection...
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4779028 |
Digital storage oscilloscope with marker for trigger location
A digital storage oscilloscope comprises an analog-to-digital converter for receiving an analog input signal and generating a succession of data words representative of the instantaneous magnitude...
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4771193 |
Synchronizing circuit
A synchronizing circuit for an oscilloscope or the like, in which in the case where a sync input signal contains composite periods like a PCM signal or video signal, it is identified to generate a...
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4760313 |
Cathode ray tube display systems
A CRT display system providing a raster pattern, possibly for a flat screen CRT, has an oscillator driving a Line counter. The Line counter drives a Field counter and a Line DAC. The Field counter...
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4754205 |
Oscilloscope having auxiliary display of a labelled cursor
An instrument for providing a principal display representing the variation of a first quantity as a function of a second quantity, comprises a display screen. A visually distinct dot is generated...
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4754204 |
Digital apparatus for convergence correction
Digital apparatus for convergence correction of a plurality of images on the screen of a television monitor includes a digital registration circuit, or an analog registration circuit using a...
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4721943 |
Digital-to-analog converter for video application
A digital-to-analog converter comprises a current source for supplying a current of predetermined magnitude to a circuit node, and a switch connected to the circuit node, and defining a first...
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4703230 |
Raster operation circuit
In a graphic display apparatus having a digital differential analyzer (DDA), a chrominance data stored in a register is written in an area of a bit map memory defined by coordinates generated from...
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4673847 |
Color monitor with improved digital convergence
A color video monitor is disclosed which includes improved digital convergence using a plurality of memory means in which vertical convergence correction values are stored, one memory each for red,...
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4649506 |
Vector generator using interpolative analog circuits
Vector (i.e., line) drawings represent the "intelligence" content of images. A method is disclosed for the gathering of intelligence and the generation of vectors on the screen of a CRT without the...
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4598234 |
Digital image correction circuit for cathode ray tube displays
A digital electron optics correction circuit for correcting the focus and astigmatism in a displayed image on a CRT is disclosed. The circuit includes a clock generator for generating a selected...
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