| Patent Number |
Title Of Patent |
Date Issued |
| 6767100 |
System and method employing reflective imaging devices for a projection display |
July 27, 2004 |
| Projected systems (10, 12, 14, 16) include light source apparatuses (20, 24, 26) for programming narrow bands of unpolarized blue, green, and red light to associated reflective imaging devices that reflect selected patterns of the blue, green, and red light into a dichroic cross-combiner |
| 6735616 |
Method and apparatus for remote projector administration and control |
May 11, 2004 |
| A remote projector and administration control method and apparatus enables the integration of presentation projector resources in an networked enterprise environment. A projector server computer connected to the network hosts one or more presentation data/video projectors. Alternativ |
| 6728402 |
Noise reduction through comparative histograms |
April 27, 2004 |
| A digital sampler generates a digital video signal by digitally sampling an analog video signal based on a pixel clock signal. The analog signal comprises a static image. A signal generator generates the pixel clock signal based on a reference signal for the analog video signal and a del |
| 6728032 |
Rear projection display system |
April 27, 2004 |
| A rear projection display system is provided. The display system includes an image source for projecting an image, a rear reflector, and a screen configured to display the projected image. The screen includes a plurality of angularly discriminating reflective elements configured to refle |
| 6719429 |
Anamorphic illumination of micro-electromechanical display devices employed in multimedia projec |
April 13, 2004 |
| Micro-electromechanical display device ("MDD")-based multimedia projectors (90, 120) of this invention employ an arc lamp (32), a color modulator (42), and anamorphic illumination systems (94, 121) for optimally illuminating a MDD (50, 76) to improve projected image brightness. MDDs |
| 6698892 |
Achieving color balance in image projection systems by injecting compensating light in a control |
March 2, 2004 |
| The image projection system of the present invention improves either one or both of the brightness and color balance of a projected image. The system includes an auxiliary light source from which compensating light co-propagates with polychromatic light emitted by a primary light source |
| 6688747 |
Achieving color balance in image projection systems by injecting compensating light |
February 10, 2004 |
| An image projection system improves the brightness and/or color balance of a projected image. The system includes an auxiliary light source from which compensating light co-propagates with polychromatic light emitted by a primary light source along a primary light path. The compensating |
| 6679607 |
Cooling device in a projector |
January 20, 2004 |
| A device for cooling a projector includes a plurality of air intakes positioned upstream from a suction fan having an integrated motor. A light source of the projector is disposed between a first air intake and the suction fan so that a first air flow, drawn by the fan through the first |
| 6678408 |
Noise reduction through comparative histograms |
January 13, 2004 |
| A method of reducing noise in a digitally sampled image in which entire frame images are sampled to form a histograms which are used to determine the relative noise level of the static image over a period of several frames. A frame of data is sampled using a pixel clock signal. A histogr |
| 6672724 |
Projection system with integrated optical device |
January 6, 2004 |
| An integrated prism-based optical device for a projection system performs light integration, beam shaping, and input/output beam separation. The integrated optical device preferably includes a light integrator tunnel with a first lens located adjacent one end and a prism located adjacent |
| 6663244 |
Illumination field blending for use in subtitle projection systems |
December 16, 2003 |
| A projection system that projects a text or subtitle box onto an image minimizes the contrast between the text box and the image. A transition region surrounding the text box minimizes visual disruption to the image onto which the text box is projected. The positions of optical elements |
| 6661475 |
Color video projection system employing reflective liquid crystal display device |
December 9, 2003 |
| An image projector (8, 68) includes a light source (14) that illuminates a three-path reflective LCD assembly (25, 74) that produces images for projection by a projection lens (27). The light source produces S-polarized light rays that are received by a spectrally selective wave plat |
| 6652105 |
Reflective light valve-based multimedia projector employing a patterned-silvered mirror |
November 25, 2003 |
| Multimedia projectors (90, 120) include a light source (32) for propagating illumination through a color modulator (42) and a light integrating tunnel (94). Lenses (100, 106) image the integrated light through a patterned-silvered mirror (104, 126) and onto a micromirror display device |
| 6646806 |
Polarized light source system with dual optical paths |
November 11, 2003 |
| The present invention provides an enhanced an enhanced polarized light source for a display system. In one embodiment, the invention includes a light source to produce light having multiple polarization states, a relay optical system to relay light imaged onto the relay optical system on |
| 6639365 |
Ultra-compact arc discharge lamp system with an additional electrode |
October 28, 2003 |
| An arc discharge lamp system comprises a third electrode for igniting the arc discharge lamp in addition to first and second electrodes which provide a main discharge current path for sustaining arc discharge after the lamp has been ignited by a high-voltage, high-frequency signal applie |
| 6636205 |
Method and apparatus for determining a clock tracking frequency in a single vertical sync period |
October 21, 2003 |
| A line parameter detection circuit (70) of this invention includes an active video detector (72) that generates an "active video" signal (102) indicative of a video signal (100) containing video data that exceeds a predetermined threshold level. The line parameter detection circuit f |
| 6635876 |
Low-loss non-imaging optical concentrator for use in infrared remote control systems |
October 21, 2003 |
| Infrared radiation receivers (40, 72) of this invention include non-imaging optical concentrators (18, 70) having light exit surfaces (52, 86); a light sensor (46) having a light entrance surface that is separated from the light exit surface by a small air gap (53); and a soft, pliable, |
| 6628094 |
Method and apparatus for canceling ripple current in a lamp |
September 30, 2003 |
| A method and apparatus for reducing ripple current in a projector lamp comprising an electrical network comprising input terminals A and C, and output terminals B and D, including a first inductive element and a second inductive element, each inductive element having a first terminal and |
| 6624585 |
Ultra-compact igniter circuit for arc discharge lamp |
September 23, 2003 |
| An igniter circuit for an arc discharge lamp comprises a DC to AC converter, a transformer, an AC to DC converter and high-voltage DC energy storage which is capable of discharging electrical energy to ignite the arc discharge lamp. In an embodiment, the igniter circuit is capable of |
| 6595005 |
Method and apparatus for measuring cooling efficacy of a fluid medium |
July 22, 2003 |
| A method and apparatus for measuring the cooling efficacy of air comprising coupling a resistive element to a temperature sensing element, applying a voltage across the resistive element, adjusting the voltage across the resistive element so that the temperature indicated by the temperat |
| 6575603 |
Split reflector |
June 10, 2003 |
| A reflector for projection systems and spot (image projecting) luminaires is molded in separate sections and then assembled into a unitary reflector. Forming the reflector in separate sections reduces the amount of surface contact between the reflector and the mold die which in turn |
| 6559837 |
Image luminance detection and correction employing histograms |
May 6, 2003 |
| A video projection display system (10) of this invention employs histograms to detect an active video region (2) of a video frame (1). A microcontroller (16) loads registers (27) in an ASIC (26) to accumulate histograms of low pixel values occurring within columns (70-74) of video da |
| 6547396 |
Stereographic projection system |
April 15, 2003 |
| A projection system for projecting a stereographic image onto a viewing surface is provided, the stereographic image including a left-eye image and a right-eye image. The projection system includes a light source for producing a beam, a beam splitter for splitting the beam of light into |
| 6546149 |
Digital noise reduction through selective pixel comparison |
April 8, 2003 |
| A method of reducing noise in a digitally sampled image is achieved in which an entire frame image is divided into regions which are used to determine the relative noise level of the static image over a period of several frames. The relative noise level is taken as a measurement and is |
| 6527417 |
Lamp assembly with vaned lamp collar |
March 4, 2003 |
| A lamp collar for use in a lamp assembly of an image projector includes vanes that form an air inlet to allow air to flow into and through the lamp assembly to cool the lamp. The vanes direct the air to flow across the lamp to cool it and to circulate within the lamp assembly before |
| 6520648 |
Lamp power pulse modulation in color sequential projection displays |
February 18, 2003 |
| A frame sequential color display projection system (110) of this invention includes an arc lamp (112) having a predetermined power rating for providing a source of polychromatic light that propagates through a color wheel (120) that sequentially provides R, G, B, and optionally, W light |
| 6517210 |
Shortened asymmetrical tunnel for spatially integrating light |
February 11, 2003 |
| A multimedia projector (30) includes a light source (32) producing a nonuniform illumination pattern and a light integrating tunnel (110, 130) having parallelogram-shaped input and output apertures (132, 134) with an average diagonal dimension. The input and output apertures are spaced |
| 6481855 |
Keystone distortion correction system for use in multimedia projectors |
November 19, 2002 |
| A multimedia projector (30) includes an image processor (36) that forms an image on an image forming device (38). Illumination reflecting off the image, propagates through a projection lens (50), along a projection axis (18), and lands on a projection surface (20) as a projected image (1 |
| 6475079 |
Method and apparatus for an air vent assembly |
November 5, 2002 |
| A method and apparatus for an air vent assembly is provided in which individual louvers and spacers are connected together to form chevron shaped channels that allow increased air flow while blocking the escape of direct light. The louvers are formed into a chevron shape that extends |
| 6474818 |
Mirror and aperture based color phase detector for use in a multimedia projection system |
November 5, 2002 |
| A multimedia projector employing a color wheel housed within a shroud uses a light guide that is integral with the shroud and formed as an aperture extending through the shroud to transmit light from the color wheel to a photo detector that detects a particular color or colors of light t |
| 6472828 |
Control for projector lamp heat dissipation |
October 29, 2002 |
| A portable image projector is provided with a fan having a control system for cooling a metal-halide arc lamp. The arc lamp cooling system of the present invention includes a fan having a fan control to operate the fan at an initially reduced level during lamp start-up to allow the t |
| 6471356 |
Portable image projection system having reduced weight and profile |
October 29, 2002 |
| An image projector employs a prism assembly that receives incident light, illuminates a reflective light modulator, and receives therefrom reflected imaging light for direction toward a small-diameter light entry pupil of a light-weight, compact projection lens. The prism assembly includ |
| 6461025 |
Lamp assembly with snap fit components |
October 8, 2002 |
| A lamp module for an image projector includes a lamp assembly connected to a lamp frame by a retainer clip having three-point snap connection to the lamp frame. The retainer clip is made of sheet metal and includes a central opening that receives the lamp assembly to form a sub-assembly |
| 6424097 |
Projection lamp safety interlock apparatus and method |
July 23, 2002 |
| A safety interlock apparatus for an electrical device includes a DC power supply, a ballast power supply including a ballast control circuit that controls a ballast power circuit, and a lamp. A relatively low voltage electrical connection is present between the DC power supply and the |
| 6419365 |
Asymmetrical tunnel for spatially integrating light |
July 16, 2002 |
| A projector includes a source of polychromatic light that propagates through color filter segments of a color wheel and enters an input aperture of an asymmetrical light integrating tunnel that integrates the filtered light into a uniform pattern at a nonrectangular output aperture o |
| 6337775 |
Collet lens mount |
January 8, 2002 |
| A mounting connection for a projection lens barrel in an image projection system is provided that includes a housing having an integral mounting portion for the projection lens barrel. The mounting portion has integral guide members formed thereon that cooperate with helical guide slots |
| 6334685 |
Segmented light pipe apparatus and method for increasing luminous efficiency of single light-val |
January 1, 2002 |
| A color sequential video projector (10) employs a color modulating device (22) and a segmented light pipe (30) that coact to provide a high luminous efficiency. The color modulating device splits polychromatic light into three different colored light beams (24, 26, 28) that are positiona |
| 6224216 |
System and method employing LED light sources for a projection display |
May 1, 2001 |
| In a single path embodiment of a multimedia projector (30) of the present invention, the light emitted from blue, green, and red generally monochromatic LEDs (72) or LED arrays (70) is propagated through optical fibers (76) and then integrated through an optical integrator (40). A di |
| 6201246 |
Non-imaging optical concentrator for use in infrared remote control systems |
March 13, 2001 |
| A non-imaging optical concentrator (18, 70) includes an optically transparent body having a substantially dome-shaped convex surface (42, 74) of revolution formed about an optical axis (24) and at least one conical concave surface of revolution (44, 76, 78) protruding into the convex |
| 6185047 |
Image projection system packaged to operate lying flat with a very low profile |
February 6, 2001 |
| An image projection system implemented with a projector engine using a reflective light modulator, preferably a Digital Micromirror Device (DMD), operates lying flat with very low profile on a support table. The invention overcomes the disadvantage of previous DMD projectors that req |
| 6155687 |
Light guide for use in a color wheel display synchronization apparatus and method |
December 5, 2000 |
| A multimedia projector (110) employing a color wheel (120) uses a light guide (152) to transmit light from the color wheel to a photo detector (156) that detects a particular color or colors of light to provide a index mark signal to a display controller (56) to synchronize red, green, |
