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 |
| 7347566 | Projection lens unit and rear projection type image display system An inexpensive projection lens unit in a rear projection type image display system, having a short focal distance (wide angle of viewing field), high focus and high contrast, and as well, including a power lens made of a glass material having a high refractive index... | 03/25/2008 |
| 7324169 | Projection optical system, projection television, and method of manufacturing lens included in projection optical system Provided are a projection optical system, a projection television, and a method of manufacturing a lens included in the projection optical system. The projection optical system includes lenses for projecting color beams onto a screen. A color filter layer, absorbing... | 01/29/2008 |
| 7312835 | Projection type display apparatus In a projection type display apparatus including a blue CRT display apparatus with low luminous efficiency and low luminous efficiency, the present invention seeks to improve contrast while suppressing the fall in brightness for red, green, and blue color as a whole... | 12/25/2007 |
| 7224525 | Optically transmitting sheet and screen Disclosed are a light transmission sheet and a screen that can realize good color reproduction while suppressing a lowering in light transmittance. The light transmission sheet comprises a light diffusing sheet and/or a colored sheet. The light diffusing sheet and/o... | 05/29/2007 |
| 7207691 | Light emitting device A light emitting device including three light emitting sources and a phosphor, with the three light sources consisted of following light emitting diodes (LED) emitting lights having different wavelengths. Wherein, two light sources are used to excite the phosphor to... | 04/24/2007 |
| 7170687 | Projection lens system and projector A projection lens system of the present invention projects projection light from a light modulator onto a screen and includes a first lens group disposed closest to the screen, the first lens group including a first meniscus lens with negative refractive power that ... | 01/30/2007 |
| 7167297 | Micromirror array In order to minimize light diffraction along the direction of switching and more particularly light diffraction into the acceptance cone of the collection optics, in the present invention, micromirrors are provided which are not rectangular. Also, in order to minimi... | 01/23/2007 |
| 7133084 | Lens systems for projection televisions Projection lens systems for use with cathode ray tube (CRT) projection televisions are provided which have positive first lens units (U1) and negative second lens units (U2) where the negative second lens units are customized in terms of at least one o... | 11/07/2006 |
| 7122812 | Leak detection lamp A light source for examining sites in heating, ventilating, and air conditioning systems for leaks using a fluorescent dye is described. The light source can include a low voltage lamp or a low heat generating lamp. ... | 10/17/2006 |
| 7113152 | Device, system and method for electronic true color display A device, system and a method for displaying image data of a plurality of colors, the device comprising a light source (50) for producing light having at least four primary colors, a controller (56, 58) for determining a combination of at least four pr... | 09/26/2006 |
| 7035017 | System and method for telecentric projection lenses A projection lens system which includes a telecentric lens assembly. The lens may be used to form an image from a light source, including for example a resonant microcavity phosphororcathode ray tube, onto a screen or display, such as in a television or a projection... | 04/25/2006 |
| 7023606 | Micromirror array for projection TV In order to minimize light diffraction along the direction of switching and more particularly light diffraction into the acceptance cone of the collection optics, in the present invention, micromirrors are provided which are not rectangular. Also, in order to minimi... | 04/04/2006 |
| 7019793 | Lens systems for projection televisions Projection lens systems for use with cathode ray tube (CRT) projection televisions are provided which have positive first lens units (U1) and negative second lens units (U2) where the negative second lens units are customized in terms of at least one o... | 03/28/2006 |
| 7012731 | Packaged micromirror array for a projection display In order to minimize light diffraction along the direction of switching and more particularly light diffraction into the acceptance cone of the collection optics, in the present invention, micromirrors are provided which are not rectangular. Also, in order to minimi... | 03/14/2006 |
| 7011416 | Projection television A projection television having a CRT assembly projecting image beams and front and rear casings, respectively provided in a front and a back of the CRT assembly, and further having a pair of CRT brackets provided between the front and rear casings, to support the CR... | 03/14/2006 |
| 7006275 | Packaged micromirror array for a projection display In order to minimize light diffraction along the direction of switching and more particularly light diffraction into the acceptance cone of the collection optics, in the present invention, micromirrors are provided which are not rectangular. Also, in order to minimi... | 02/28/2006 |
| 6976779 | Planar light source device and liquid crystal display device using the same The liquid crystal display device has red, green, and blue LEDs, each emitting a different color light, as a light source. An acrylic lens is mounted on the emission surface of the LED to change angular distributions of light from the LED. The shape of the acrylic l... | 12/20/2005 |
| 6975337 | Projection type image display device A projection type image display device includes a plurality of image display elements that perform modulation of light rays in accordance with an image signal, a color synthesizing optical element for synthesizing light rays having mutually different wavelength rang... | 12/13/2005 |
| 6956247 | Semiconductor light emitting device including photonic band gap material and luminescent material A light emitting structure includes a semiconductor light emitting device capable of emitting first light having a first peak wavelength, a luminescent material capable of emitting second light having a second peak wavelength disposed over the semiconductor light em... | 10/18/2005 |
| 6940643 | Projection screen having elongated structures A light managing screen may provide a rear projection screen, front projection screen or component thereof. The screen may comprise a polymeric composition including a first polymeric material, and a second polymeric material disposed as a plurality of elongated str... | 09/06/2005 |
| 6921174 | Projection television cabinet having a one-piece reference structure A cabinet for a projection television system, the cabinet including a one-piece molded structure for mounting the components, and reference surfaces unitary with the structure, for mechanically aligning critical optical components of the television system with one a... | 07/26/2005 |
| 6900945 | Lenticular lens sheet A lenticular lens sheet 4 comprises a plurality of lens elements of incidence 21 arranged on the incidence side, and a plurality of lens elements of emergence 22 arranged on the emergence side. The light that has passed through each lens element... | 05/31/2005 |
| 6791629 | Lens systems for projection televisions Projection lens systems for use with cathode ray tube (CRT) projection televisions are provided which have positive first lens units (U1) and negative second lens units (U2) where the negative second lens units are customized in terms of at least one o... | 09/14/2004 |
| 6639631 | Projection television using a holographic screen A projection television receiver having red, green and blue image projectors for respective images of different colors and a high gain projection screen formed by at least one hologram disposed on a substrate superimposed on at least one light transmissiv... | 10/28/2003 |
| 6501517 | Optical system in projection television receiver An optical system in a projection television receiver includes: a screen for simultaneously displaying R (Red), G (Green) and B (Blue) images thereon; and a light source part comprising R, G and B cathode ray tubes. The R and B cathode ray tubes project t... | 12/31/2002 |
| 6400417 | Projection television with three-dimensional holographic screen and centered blue CRT for balanced CRT drive In a method for controlling color temperature a projection television having green, blue and red image projectors and a projection screen, holographically improving color shift performance of the screen results in an undesirable controlled input angle cha... | 06/04/2002 |
| 6369864 | Optical unit spacer-bracket for projection television sets A projection television set having a screen and three projection units each capable of projecting a monochromatic image onto the screen. The projection units each having a cathode ray tube (CRT) optically coupled to a projection lens, which includes both ... | 04/09/2002 |
| 6342929 | Projection image display apparatus The projection image display apparatus includes a plurality of image generating sources for generating three primary colors, including red, green, blue image light, respectively, and a projection lens containing a plurality of lens elements provided in co... | 01/29/2002 |
| 6275272 | Projection television receiver A projection television receiver for embodying a high definition and high quality projection television receiver by processing an image of an image source. A red, a green and a blue image are formed and emitted into a red, a green and a blue colors at a c... | 08/14/2001 |
| 6275270 | Video display and image intensifier system A video display system utilizing a video source and an image intensifier having a substrate. A video image source positions at the substrate to provide a photon signal. A photocathode element at the substrate converts the photon signal into electrons. An ... | 08/14/2001 |
| 5907373 | Projection type color image display device In a projection type image display device for combining an image by dichroic mirrors in a form of parallel plane plate, a projected image of high picture quality is presented by suppressing the astigmatism. In a projection type image display device compri... | 05/25/1999 |
| 5764312 | Projector apparatus A projector apparatus which assures easier fine and rough adjustment of a swing and tilt angle, includes inclination rings which are formed symmetrically with respect to the center line of the aperture and is provided with at least two or more continuous ... | 06/09/1998 |
| 5712691 | Method and apparatus for area dependent dynamic blue de-focusing A method and projection television system for projecting images having a plurality of color components, includes a device for filtering a first color component signal from a composite signal to provide a filtered first color component signal. A defocusing... | 01/27/1998 |
| 5663774 | Three tube beam projection system and method A projection system suitable for reducing the convergence angles for red, green and blue color beams is disclosed. The projection system includes first and second beam projection tubes arranged in an in-line type arrangement in the center of the interior ... | 09/02/1997 |
| 5619255 | Wide-screen video system An apparatus and method for displaying wide-screen images by assembling a composite image from three or more video segments, wherein a panoramic or cinematic wide-screen image is captured using three or more standard video cameras that are lined up, side-... | 04/08/1997 |
| 5585867 | Projection tube and its application in a video projection system A projection tube featuring good accuracy in controlling a slant angle between a cathode ray tube and a projection lens, an excellent focusing performance, and further low production cost, and also a video projection systems which utilizes the foregoing p... | 12/17/1996 |
| 5559564 | Cathode ray tube apparatus for projection TV system A cathode ray tube apparatus for a projection TV system which improves the color purity of the luminescence in the cathode ray tube, reduces the chromatic aberration by the projection lens, enables the same type of projection lens to be mounted for all of... | 09/24/1996 |
| 5543862 | Video display and image intensifier system A video display system utilizing a video source and an image intensifier having a first optically transparent body including first and second surfaces. The first surface receives the video image while the second surface includes a layer of photocathode ma... | 08/06/1996 |
| 5387948 | Method and apparatus for reducing scattered light in projection television tubes To prevent light scattering at the edges of CRT's used in projection television, emission of light is prevented beyond a desired region of raster scanning. In one embodiment, portions of the front surfaces of the CRT's outside the desired region are darke... | 02/07/1995 |
| 5381189 | Projector in a projection television A liquid cooling type projector is provided with greater flexibility to meet different screen sizes of a projection television and, thus, contributes to the reduction of production cost. The projector has a cylindrical frame containing a projection lens u... | 01/10/1995 |
