Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7333130 | Apparatus and method of re-adjusting convergence of a projection TV A method and an apparatus of re-adjusting convergence of a projection TV are disclosed. The apparatus includes a display device on which an image is projected and at least one light-sensing element (101) being provided around the display device. The light-sen... | 02/19/2008 |
| 7183713 | Auxiliary coil driver circuit for a cathode ray tube A magnetic field compensation winding arrangement for a cathode ray tube includes a magnetic field compensation winding positioned on the cathode ray tube to compensate for an ambient magnetic field. An operational amplifier is used for generating a magnetic field c... | 02/27/2007 |
| 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 to compare the value of the line current Il w... | 11/28/2006 |
| 7034900 | Color display device and method utilizing convergence correction In a color display device, apparatus and method are provided to produce a convergence correction signal based on digital convergence correction values. The data rate by which the data is supplied to the apparatus varies, depending on the area of the display correspo... | 04/25/2006 |
| 6975302 | Isometric joystick usability A ballistics subsystem is coupled to a force sensor of an isometric input device. The ballistics subsystem augments control by applying a dual gain transfer function that smoothly transitions from separate gain factors for low and high force inputs. When applied in ... | 12/13/2005 |
| 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 correction signal controller, a vertical screen size compensation ci... | 12/14/2004 |
| 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 time corresponding to the deleted horizontal scanning lines... | 03/09/2004 |
| 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 video standard and a second voltage when displaying video acco... | 12/09/2003 |
| 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 circuit, a first reference buffer circuit, a second reference buf... | 11/25/2003 |
| 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; an interval decoder which calculates the value of the bra... | 05/21/2002 |
| 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, which detects the aspect ratio of the signal and determines w... | 03/19/2002 |
| 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 controlling a CRT beam in a film recorder. The system contain... | 05/15/2001 |
| 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 produces from the data signal an analog, output signal at a f... | 08/29/2000 |
| 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 using a serial input type digital/analog converter, and output... | 10/19/1999 |
| 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 order to display an image. The electron beams are modulat... | 08/11/1998 |
| 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 control voltage and the side pincushion of the picture using a... | 06/23/1998 |
| 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 decimator to extract a decimated sample value from each decima... | 04/14/1998 |
| 5663617 | Parabolic-wave shaping circuit for focus-correction A parabolic-wave shaping circuit for focus-correction which can output only the necessary part of a parabolic-waveform for focus-correction is constructed so as to clip an output waveform of an output amplifier amplifying a parabolic-wave having a horizon... | 09/02/1997 |
| 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 this clock whose number corresponds to the quotient of th... | 12/03/1996 |
| 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 of horizontal scanning lines in which linearity of a rast... | 12/05/1995 |
| 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 signals to be displayed. This is caused, inter alia by the fact ... | 02/14/1995 |
| 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 synchronism with a horizontal synchronous signal of an inpu... | 10/25/1994 |
| 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 analog convertor in accordance with a reference potential co... | 10/11/1994 |
| 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 pulses to given portions within every field of video signals... | 08/16/1994 |
| 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 each address are fed to a peak detector. The peak value i... | 06/14/1994 |
| 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 accordance with a count value of a horizontal sync. signal... | 03/15/1994 |
| 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 converter (71) for converting an output of the memory into an anal... | 12/21/1993 |
| 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 position counter is incremented at a linear rate, and the ... | 08/24/1993 |
| 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 position of input signal, a detector for detecting an output ... | 06/29/1993 |
| 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 first data signal to be non-alterable. The programming is d... | 04/20/1993 |
| 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 employed. The computer system samples the state of an array of swi... | 03/24/1992 |
| 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 aspherical surface plastic lens attached to the display scre... | 10/22/1991 |
| 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 the scan rate and aspect ratio of its sweep circuit. The swe... | 05/07/1991 |
| 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 degamma correcting pixel value data stored on a frame buffer... | 04/30/1991 |
| 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 successively and cyclically over N lines of a picture plan... | 04/23/1991 |
| 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. The output of the programmable counter is supplied to a me... | 12/25/1990 |
| 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 one-field digital image data. The digital image data read ou... | 11/13/1990 |
| 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 settable and a stepwise change takes place each time upon the ... | 06/12/1990 |
| 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 digital signals representative of the desired sweep contr... | 10/17/1989 |
| 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 correction waves using the coefficient storing circuit, a corre... | 09/26/1989 |
