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| Number | Title | Issue Date |
| 7071636 | Scanning circuit of electron tube displays The invention concerns a control circuit for an electron tube display comprising a deflection coil, the deflection coil being part of a scanning circuit and being coupled to a coil of a transformer powering a high voltage generator used to accelerate an electron bea... | 07/04/2006 |
| 6958785 | Method and apparatus for determining and correcting for illumination variations in a digital projector The need is met according to the present invention by providing a method of correcting pixel by pixel variations in a display, the method including the steps of creating a defect map of pixel intensity offsets for the display; correcting an input signal according to... | 10/25/2005 |
| 6926419 | Backlight unit structure for liquid crystal display Disclosed is a backlight unit structure for an LCD (Liquid Crystal Display). The backlight unit structure comprises: a lamp disposed under a display panel; and a reflection plate rotatably disposed around the lamp and having an opening through which light can be con... | 08/09/2005 |
| 6707509 | Method for adjusting convergence in a projection television receiver A method for adjusting convergence in a projection television receiver, in which a marker contained in a projected image is adjusted by a manipulated variable to illuminate a photosensor arranged adjacent to the projection screen. The method employs two markers whic... | 03/16/2004 |
| 6568812 | System for mounting infrared receiver behind mirror in rear projection television applications A system for mounting an infrared (IR) remote control receiver in a rear projection television apparatus features a mirror having a coating wherein visible light is reflected to a viewing device, and light in the infrared regions is passed through the mir... | 05/27/2003 |
| 6538705 | Image projecting system In a system according to the invention, fine image data 2 created and output by a personal computer 1 is input to an image processing/dividing section 4. The image processing/dividing section 4 determines, on the basis of parameters stored in a projector ... | 03/25/2003 |
| 6222593 | Image projecting system In a system according to the invention, fine image data 2 created and output by a personal computer 1 is input to an image processing/dividing section 4. The image processing/dividing section 4 determines, on the basis of parameters stored in a projector ... | 04/24/2001 |
| 6108612 | Coded objects and methods for detecting such coded objects Disclosed is a method of finding a reference object within a coded object having a plurality of regions. Each region has a plurality of subregions, and at least a majority of a first one of the subregions has a different color from a second one of the sub... | 08/22/2000 |
| 5883476 | Convergence correction system with recovery function and display apparatus using the same A plurality of photo detectors are arranged outside the display screen of a projection display apparatus having a built-in digital convergence correction system and a function for adjusting data in the frame memory so as to coincide the photoelectric devi... | 03/16/1999 |
| 5694003 | Plural gun color CRT with inclined index phosphor layers A color cathode-ray tube comprises a phosphor screen formed on an inner surface of a face plate and having a plurality of three-color phosphor layers. A plurality of first index phosphor layers are provided on the phosphor screen and extending in parallel... | 12/02/1997 |
| 5432404 | Apparatus for detecting a geometric distortion of an image on a display device For the purpose of detecting a geometric distortion of an image on a screen of a CRT display device, i.e., the deviation of the positional coordinates at a high speed and with a high accuracy, the positions of window images having about 10 rows and 10 col... | 07/11/1995 |
| 5428269 | Methods and apparatus for improving cathode ray tube image quality A time-varying control signal is developed by a current sensor connecting the imaging screen and a closely proximate screen grid of a cathode ray tube as an imaging electron beam is operatively swept across the screen to produce images thereon. The contro... | 06/27/1995 |
| 5343119 | Index type CRT having a photosensor with a function of amplifier A display device includes a beam index type cathode ray tube having a fluorescent screen on which red, green and blue fluorescent materials are formed in strip configurations and further index fluorescent materials are formed in strip configurations with ... | 08/30/1994 |
| 5291102 | Dynamic color separation display A Dynamic Color Separation (DCS) color display system employs signals which provide timing, luminance, and chrominance information of the display output. The display system includes a timing circuit which produces unique signals for correcting errors prod... | 03/01/1994 |
| 5111110 | Method of determining a display parameter in a picture display tube and method of improving a picture display in a picture display tube A method of determining display parameters of an electron beam picture tube. An image pattern is produced on the display screen of the tube by frequency modulating the electron beam. The frequency component of the image pattern having a frequency equal to... | 05/05/1992 |
| 4920410 | Drive method for synchronizing scanning and modulation of flat-configuration color CRT A drive method for a color CRT in which a point-sequential color video signal is produced to drive a modulation electrode of the CRT, in which an index signal is generated consisting of pulses at a frequency identical to a frequency of scanning successive... | 04/24/1990 |
| 4896082 | Raster distortion correction circuit In a circuit arrangement for correcting a raster distortion in a cathode ray tube, at least one vertical perforated, index strip of a sensor is arranged at a corresponding margin of a picture producing screen of the cathode ray tube. An index signal that ... | 01/23/1990 |
| 4814669 | Method of determining the position of an electron beam in a shadow mask display tube A fast method of determining the position of an electron beam in a shadow mask display tube and has particular application to measuring the convergence of electron beams in color display tubes. A camera is positioned against a color display tube faceplate... | 03/21/1989 |
| 4812713 | Automatic closed loop scaling and drift correcting system and method Reference beam deflection command values are assigned to respective pinholes at two diametrically opposite corners of a cathode ray screen. The pinholes sense actual beam position by transmitting light via respective fiberoptic cables to a detector arrang... | 03/14/1989 |
| 4749907 | Method and apparatus for automatically calibrating a graticuled cathode ray tube A method and apparatus for automatically calibrating the deflection of an electron beam in a graticuled cathode ray tube. The apparatus includes a microprocessor and digital-to-analog converter for generating input signals of a predetermined accuracy and ... | 06/07/1988 |
| 4703231 | Flat type image display tube and display device using the same In a flat image display tube, a phosphor screen having an image display region and index region, a plurality of electron beam generators and a plurality of horizontal deflection electrodes are provided. The image display region has three primary color pho... | 10/27/1987 |
| 4694221 | Device for the restitution and/or analyzing of color images using line-type fiber optics cathode ray tube A device for the restitution and/or analyzing (digitalizing) of color images on an image carrier, comprising a cathode ray tube with a line screen, an assembly of optical fibers fixed on the front face of the tube screen, a color mask in film form, fixed ... | 09/15/1987 |
| 4677340 | Method and apparatus for calibrating deflection in an oscilloscope The cathode-ray-tube beam deflection of an oscilloscope is automatically calibrated by photoelectrically detecting the intersection of the tube's electron beam with visible graticule lines on the tube's faceplate. An input signal is compared, at the time ... | 06/30/1987 |
| 4658288 | Beam index system with switchable memories A beam index CRT system includes a pair of memories that are selectively operated to store lines of data from a source and to supply stored lines of data to a CRT. A plurality of NOR gates and flip-flops toggle memory addressing means and simultaneously a... | 04/14/1987 |
| 4651197 | Beam index system having two distinct levels of index video signal A wide-band single beam index signal system includes a photo multiplier tube supplying a decay compensation circuit for developing an output signal responsive to excitation of index strips by the electron beam of the CRT. The output signal is supplied to ... | 03/17/1987 |
| 4642529 | Apparatus and method for measuring linewidth and convergence in a color cathode ray tube display system Apparatus for providing precise convergence measurements of electron beams in a CRT display by sensing the displacement of brightness peaks as an array of phosphorescent regions are sequentially illuminated by energy from the electron beams deflected by t... | 02/10/1987 |
| 4636843 | Deflection control apparatus for a beam index color television receiver Deflection control apparatus for a beam index color television receiver includes a phase-locked loop for synchronizing an oscillating signal with an index signal generated by an electron beam scanning index stripes on the screen of the cathode ray tube of... | 01/13/1987 |
| 4625153 | Sensor system for television picture tubes A sensor system is adapted for use in automatically adjusting the deflection system of a television picture tube so as to compensate for pincushion distortion including a rectangular frame disposed along the edge of the screen within the sweep range of th... | 11/25/1986 |
| 4617495 | Autoconvergence of a cathode ray tube using a semiconductor detector A CRT calibration system is provided having a CRT with a display screen, an electron gun system, and a plurality of feedback elements. Each feedback element has an active area disposed proximately to the display screen at a preselected location such that ... | 10/14/1986 |
| 4459512 | Cathode-ray display tube for color printers A cathode-ray display tube for color printers has a phosphor screen comprises a blue-emitting phosphor having a maximum ability of color emission in the range of wavelengths of 480 mμ and below with a radiant energy in the range of wavelengths of about 4... | 07/10/1984 |
| 4364083 | Beam index type color television receiver A beam index type color television receiver having a beam index type color cathode ray tube which includes a screen having a plurality of groups of color phosphor elements and index phosphor elements, an index signal sensing device for detecting index sig... | 12/14/1982 |
| 4352047 | Side pincushion correcting circuit for color television receivers A side pincushion correcting circuit is provided in a color television receiver of the type including a cathode ray tube having an index stripe disposed on a screen scanned by a cathode beam and a detector for detecting the scanning of the index stripe by... | 09/28/1982 |
| 4316216 | Beam index color television receiver In a beam index color television receiver of the type having a cathode ray tube provided with beam-excitable color elements disposed on an image area of a display screen of the cathode ray tube and index elements disposed on the image area and a contiguou... | 02/16/1982 |
| 4314179 | Horizontal scanning rate correction apparatus A horizontal scanning rate correction apparatus for a cathode-ray tube, particularly of the beam index color cathode-ray tube type, includes a memory for storing correction values representing deviations of the horizontal scanning rate of the electron bea... | 02/02/1982 |
| 4287531 | Deflection control apparatus for a beam index color cathode ray tube Deflection control apparatus is disclosed for a beam index color television receiver of the type which includes a cathode ray tube adapted to display a video picture in response to a received color television signal. The beam index cathode ray tube is pro... | 09/01/1981 |
| 4263614 | Phase tracking loop circuit A phase-tracking loop circuit which can be used, for example, as an FM detector or as a frequency-tracking control circuit to control the index signal of a beam-index cathode ray tube (CRT), includes an adder receiving an input signal of fluctuating frequ... | 04/21/1981 |
| 4261010 | Beam index color television receiver apparatus In a beam index color television receiver of the type having a cathode ray tube which is provided with beam-excitable color elements disposed on a display screen of the cathode ray tube and index elements which are scanned by an electron beam as the beam ... | 04/07/1981 |
| 4259687 | Beam index color cathode ray tube In a beam index color television receiver having the screen of its color cathode ray tube provided with a repetitive pattern of a plurality of groups of different primary color phosphor elements arranged side-by-side across the image area of the screen to... | 03/31/1981 |
| 4251832 | Index signal amplifier for use in a beam index television receiver An index signal amplifier arrangement is disclosed for use in a beam index color television receiver of a type which includes a picture reproducer having index stripes disposed to be scanned by an electron beam and a photodetector for detecting when respe... | 02/17/1981 |
| 4232332 | Color television receiver A control system for a beam index cathode ray tube momentarily gates or turns off all beam current at the transition from one color modulating signal to another. The resulting dip in the electron beam density, as it scans across an index phosphor stripe l... | 11/04/1980 |
