Patents by Inventor Masayuki Karakawa
Masayuki Karakawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20160223736Abstract: Apparatus for use in display systems are disclosed. In certain implementations, a display apparatus includes a light guide plate for use in a liquid crystal display backlight system. In other implementations, an apparatus for use in a projection display is disclosed including a substantially transparent rectangular prism. In implementations including laser-based light sources, the light guide plate or substantially transparent rectangular prism is configured to reduce the spatial coherence of laser light introduced thereto, thereby reducing speckle. The light guide or prism includes a plurality of light scattering particles suspended therein; alternatively the light guide or prism has a set of scratches on a surface thereof, rending the surface substantially opaque.Type: ApplicationFiled: March 14, 2014Publication date: August 4, 2016Applicant: DOLBY LABORATORIES LICENSING CORPORATIONInventors: Masayuki KARAKAWA, David GIROUX
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Patent number: 9217876Abstract: Methods and systems are described herein which produce polarization-independent full color images suitable for rear-projection television sets and other multimedia displays. The system uses illumination with R, G, B light from two different light sources for each color. A viewer wears glasses with narrowband optical filters, preferably holographic filters. The R, G, B light from the light sources is slightly offset at each of the 3 emission wavelengths, with one set of R, G, B light being filtered by the holographic filter in front of the left eye of the, and the other set of R, G, B light being filtered by the holographic filter in front of the viewer's right eye.Type: GrantFiled: May 19, 2014Date of Patent: December 22, 2015Assignee: Christie Digital Systems USA, Inc.Inventor: Masayuki Karakawa
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Publication number: 20150002766Abstract: Methods and systems are described herein which produce polarization-independent full color images suitable for rear-projection television sets and other multimedia displays. The system uses illumination with R, G, B light from two different light sources for each color. A viewer wears glasses with narrowband optical filters, preferably holographic filters. The R, G, B light from the light sources is slightly offset at each of the 3 emission wavelengths, with one set of R, G, B light being filtered by the holographic filter in front of the left eye of the, and the other set of R, G, B light being filtered by the holographic filter in front of the viewer's right eye.Type: ApplicationFiled: May 19, 2014Publication date: January 1, 2015Applicant: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Patent number: 8730306Abstract: Methods and systems are described herein which produce polarization-independent full color images suitable for rear-projection television sets and other multimedia displays. The system uses illumination with R, G, B light from two different light sources for each color. A viewer wears glasses with narrowband optical filters, preferably holographic filters. The R, G, B light from the light sources is slightly offset at each of the 3 emission wavelengths, with one set of R, G, B light being filtered by the holographic filter in front of the left eye of the, and the other set of R, G, B light being filtered by the holographic filter in front of the viewer's right eye.Type: GrantFiled: April 24, 2007Date of Patent: May 20, 2014Assignee: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Patent number: 8334946Abstract: A flat panel display includes a backlight with a plurality of lasing elements. A light distributor distributes light from the lasing elements across the flat panel display. In edge-lit backlights, the light distributor may be a light guide. In direct-lit backlights, the light distributor may be one or more light diffusers that randomize the polarization of light. A polarization enhancement film increases the polarization of light from the light distributor by allowing light of a first polarization to pass through the film and reflecting light that is not of the first polarization back into the backlight. The light reflected back into the backlight is randomly re-polarized within the backlight. An array of light modulators arranged across the flat panel display modulates light emitted by the backlight.Type: GrantFiled: January 15, 2010Date of Patent: December 18, 2012Assignee: Corporation For Laser Optics ResearchInventor: Masayuki Karakawa
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Patent number: 8152351Abstract: Laser lit flat panel displays are disclosed including edge-lit and direct lit backlights. In certain embodiments, laser assemblies are selected to obtain bandwidth distributions to reduce speckle.Type: GrantFiled: December 2, 2010Date of Patent: April 10, 2012Assignee: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Publication number: 20110075067Abstract: Laser lit flat panel displays are disclosed including edge-lit and direct lit backlights. In certain embodiments, laser assemblies are selected to obtain bandwidth distributions to reduce speckle.Type: ApplicationFiled: December 2, 2010Publication date: March 31, 2011Applicant: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Patent number: 7866869Abstract: Laser lit flat panel displays are disclosed including edge-lit and direct lit backlights. In certain embodiments, laser assemblies are selected to obtain bandwidth distributions to reduce speckle.Type: GrantFiled: October 27, 2008Date of Patent: January 11, 2011Assignee: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Publication number: 20100182536Abstract: A flat panel display includes a backlight with a plurality of lasing elements. A light distributor distributes light from the lasing elements across the flat panel display. In edge-lit backlights, the light distributor may be a light guide. In direct-lit backlights, the light distributor may be one or more light diffusers that randomize the polarization of light. A polarization enhancement film increases the polarization of light from the light distributor by allowing light of a first polarization to pass through the film and reflecting light that is not of the first polarization back into the backlight. The light reflected back into the backlight is randomly re-polarized within the backlight. An array of light modulators arranged across the flat panel display modulates light emitted by the backlight.Type: ApplicationFiled: January 15, 2010Publication date: July 22, 2010Applicant: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Publication number: 20100149222Abstract: The invention relates to light sources and displays incorporating blue laser pumped light sources that provide green light. According to a first aspect of the invention, a green light source includes a semiconductor diode laser emitting light in an optical path having a dominant wavelength within the blue spectral region, a substrate positioned in the optical path of the semiconductor diode laser, and a material coupled to the substrate. The material is selected to absorb light emitted by the semiconductor diode laser and, in response, to emit light having a dominant wavelength within the green spectral region. According to a second aspect of the invention, an apparatus includes a lighting module for a display, the lighting module includes an array of red laser light sources, an array of blue laser light sources, and an array of green light sources according to the first aspect of the invention.Type: ApplicationFiled: July 10, 2009Publication date: June 17, 2010Applicant: Corporation for Laser Optics ResearchInventors: David Welford, Masayuki Karakawa
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Publication number: 20090109658Abstract: Laser lit flat panel displays are disclosed including edge-lit and direct lit backlights. In certain embodiments, laser assemblies are selected to obtain bandwidth distributions to reduce speckle.Type: ApplicationFiled: October 27, 2008Publication date: April 30, 2009Applicant: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Publication number: 20070247709Abstract: Methods and systems are described herein which produce polarization-independent full color images suitable for rear-projection television sets and other multimedia displays. The system uses illumination with R, G, B light from two different light sources for each color. A viewer wears glasses with narrowband optical filters, preferably holographic filters. The R, G, B light from the light sources is slightly offset at each of the 3 emission wavelengths, with one set of R, G, B light being filtered by the holographic filter in front of the left eye of the, and the other set of R, G, B light being filtered by the holographic filter in front of the viewer's right eye.Type: ApplicationFiled: April 24, 2007Publication date: October 25, 2007Applicant: Corporation for laser optics researchInventor: Masayuki Karakawa
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Patent number: 7103074Abstract: A pulsed laser device and a laser display system using the pulsed laser device are disclosed that thwart recording of displayed video images with electronic imaging devices. The pulsed laser device is Q-switched, whereby the Q-switch trigger pulses have a temporal pattern that includes a blanking period of a duration that is longer than a repetition time between consecutive trigger pulses and shorter than a time period perceived by the human eye. The output beam of the Q-switched pulse laser is frequency-converted by non-linear optical frequency conversion into an imaging beam, for example, a three-color RBG beam, that can be modulated for displaying color images. The blanking period renders the displayed images practically unsuitable for off-screen recording with electronic image recording devices, such as CCD movie cameras.Type: GrantFiled: June 3, 2004Date of Patent: September 5, 2006Assignee: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Publication number: 20050018717Abstract: A pulsed laser device and a laser display system using the pulsed laser device are disclosed that thwart recording of displayed video images with electronic imaging devices. The pulsed laser device is Q-switched, whereby the Q-switch trigger pulses have a temporal pattern that includes a blanking period of a duration that is longer than a repetition time between consecutive trigger pulses and shorter than a time period perceived by the human eye. The output beam of the Q-switched pulse laser is frequency-converted by non-linear optical frequency conversion into an imaging beam, for example, a three-color RBG beam, that can be modulated for displaying color images. The blanking period renders the displayed images practically unsuitable for off-screen recording with electronic image recording devices, such as CCD movie cameras.Type: ApplicationFiled: June 3, 2004Publication date: January 27, 2005Applicant: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Patent number: 6774881Abstract: A monochromatic red (R), green (G), blue (B) pulsed laser source with reduced speckle noise is disclosed. The R, G, B laser source can be used in a full color video/image display system, particularly an LCD display system.Type: GrantFiled: October 15, 2001Date of Patent: August 10, 2004Assignee: Corporation For Laser Optics ResearchInventor: Masayuki Karakawa
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Patent number: 6671305Abstract: The invention is directed to a compact optically side-pumped solid-state laser with an optimized overlap between the mode of the laser beam propagating in the laser material and the pump beam. Using a common pump volume, the compact solid-state laser can simultaneously emit laser beams at different wavelengths. The laser can be combined with nonlinear optical elements to provide a RGB three color laser architecture suitable for color projection display applications.Type: GrantFiled: August 20, 2001Date of Patent: December 30, 2003Assignee: Corporation for Laser Optics ResearchInventors: Mark Gregory Knights, Glen Allan Rines, Masayuki Karakawa
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Patent number: 6483556Abstract: A full color, pulsed laser video system having solid state red (R), green (G) and blue (B) lasers (10, 12, 14) as a source, and with a projection screen having a two-channel image (24) for the screen, and with optical fiber remote image delivery (30).Type: GrantFiled: July 27, 1999Date of Patent: November 19, 2002Assignee: Corporation for Laser Optics ResearchInventors: Masayuki Karakawa, Robert J. Martinsen, Stephen R. McDowell
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Patent number: RE44949Abstract: Laser lit flat panel displays are disclosed including edge-lit and direct lit backlights. In certain embodiments, laser assemblies are selected to obtain bandwidth distributions to reduce speckle.Type: GrantFiled: December 17, 2012Date of Patent: June 17, 2014Assignee: Corporation for Laser Optics ResearchInventor: Masayuki Karakawa
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Patent number: RE46664Abstract: Laser lit flat panel displays are disclosed including edge-lit and direct lit backlights. In certain embodiments, laser assemblies are selected to obtain bandwidth distributions to reduce speckle.Type: GrantFiled: March 7, 2013Date of Patent: January 9, 2018Assignee: Dolby Laboratories Licensing CorporationInventor: Masayuki Karakawa
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Patent number: RE47887Abstract: Laser lit flat panel displays are disclosed including edge-lit and direct lit backlights. In certain embodiments, laser assemblies are selected to obtain bandwidth distributions to reduce speckle.Type: GrantFiled: October 26, 2016Date of Patent: March 3, 2020Assignee: Dolby Laboratories Licensing CorporationInventor: Masayuki Karakawa