US Patent No: 6,155,687

Number of patents in Portfolio can not be more than 2000

Light guide for use in a color wheel display synchronization apparatus and method

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Abstract

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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, and blue image data with the associated color wheel filter segments. An integrator tunnel (122) adjacent to the light guide provides uniform, high intensity light from the color wheel to a display device, such as a DMD (130). The photo detector senses otherwise wasted light rays as sensing rays (150) that are reflected by a light source reflector (114) and propagated through the color wheel. To collect some of the sensing rays, the light guide is preferably bonded to the integrator tunnel. The light guide has a slanted output end (154) that reflects the collected sensing rays toward a photo detector on a circuit board (148). Because the light guide is bonded to the integrator tunnel, and because the color wheel rotates its filter segments from the light guide toward the integrator tunnel, the photo detector senses color changes slightly before they are received by the DMD, which is advantageous because the resulting predictive timing is consistent from one projector to the next, thereby eliminating timing adjustments.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SEIKO EPSON CORPORATIONTOKYO18718

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Peterson, Mark Houston, TX 122 651

Cited Art Landscape

Patent Info (Count) # Cites Year
 
TEXAS INSTRUMENTS INCORPORATED (4)
5,467,146 Illumination control unit for display system with spatial light modulator 150 1994
5,680,180 Color balance compensation for digital display system with color wheel 45 1995
5,905,545 Full-color projection display system using two light modulators 75 1996
6,054,832 Electronically programmable color wheel 62 1998
 
HEWLETT-PACKARD COMPANY (1)
6,005,722 Optical display system including a light valve 116 1998
 
PHILIPS ELECTRONICS NORTH AMERICA CORPORATION (1)
5,917,558 Method for controlling a color projection video system 61 1997
 
SEIKO EPSON CORPORATION (1)
5,967,636 Color wheel synchronization apparatus and method 58 1998
 
SHARP KABUSHIKI KAISHA (1)
5,805,243 Liquid crystal projector using a spatial light modulator and two rotating color filters 26 1996

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
SEIKO EPSON CORPORATION (11)
6,419,365 Asymmetrical tunnel for spatially integrating light 56 2000
6,474,818 Mirror and aperture based color phase detector for use in a multimedia projection system 10 2000
6,471,356 Portable image projection system having reduced weight and profile 29 2000
6,520,648 Lamp power pulse modulation in color sequential projection displays 53 2001
6,767,100 System and method employing reflective imaging devices for a projection display 7 2001
6,953,251 Projector and optical device 13 2004
7,408,202 Solid state device with current spreading segments 0 2005
7,059,727 Projector and optical device 2 2005
7,553,033 Projector and optical device 1 2006
RE41768 System and method employing reflective imaging devices for a projection display 0 2006
RE44279 Lamp power pulse modulation in color sequential projection displays 0 2012
 
TRANSPACIFIC IMAGE, LLC (9)
7,156,522 Projection-type display devices with reduced weight and size 14 2004
7,281,807 Positionable projection display devices 9 2004
7,806,535 Low power projection display devices 1 2007
7,703,930 Positioning interfaces for projection display devices 6 2007
7,510,284 Projection-type display devices including redundant laser sets 9 2007
RE42251 Projection-type display devices with reduced weight and size 0 2008
8,147,074 Positioning interfaces for projection display devices 2 2010
8,366,282 Positioning interfaces for projection display devices 0 2012
8,641,209 Positioning interfaces for projection display devices 0 2012
 
TEXAS INSTRUMENTS INCORPORATED (8)
6,275,271 Tone display method 8 2000
6,771,325 Color recapture for display systems 41 2000
7,052,150 Rod integrator 9 2000
6,591,022 Illumination system for scrolling color recycling 33 2001
7,066,605 Color recapture for display systems 5 2004
7,118,226 Sequential color recapture for image display systems 5 2005
7,184,213 Rod integrators for light recycling 2 2006
7,252,391 Method of producing an image 3 2006
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (5)
7,052,146 Replaceable color wheel 2 2004
7,018,073 Datum structure for ensuring alignment of a lamp assembly 2 2004
7,011,433 Datum structure for ensuring alignment with respect to a reflector assembly 1 2004
7,188,959 Lamp receiver for use in projector systems 1 2004
7,465,054 Focusing arrangement 4 2004
 
CORETRONIC CORPORATION (3)
8,104,898 Projection apparatus 0 2007
7,883,215 Projector and projector circuit board thereof 0 2008
8,496,333 Illumination module having wavelength conversion unit, projection apparatus, and light source control method 0 2011
 
ALTMAN STAGE LIGHTING CO., INC. (1)
6,671,005 Digital micromirror stage lighting system 28 1999
 
CASIO COMPUTER CO., LTD. (1)
7,976,172 Projection apparatus, projection method, and computer program 1 2007
 
DELTA ELECTRONICS, INC. (1)
7,837,336 Projection device and color wheel for use therewith 1 2006
 
FUNAI ELECTRIC CO., LTD. (1)
6,874,894 DMD equipped projector 3 2003
 
JDS UNIPHASE CORPORATION (1)
6,953,275 System and method for providing a uniform source of light 2 2004
 
MINOLTA CO., LTD. (1)
6,840,631 Illuminating apparatus, and projector using the illuminating apparatus 2 2002
 
REGENTS OF THE UNIVERSITY OF MINNESOTA (1)
6,726,332 TIR prism for DMD projector 13 2002
 
UNAXIS BALZERS LTD. (1)
7,046,897 Light beam preparation arrangement 1 2003

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