Patents by Inventor Walter M. Duncan
Walter M. Duncan 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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Patent number: 8208759Abstract: An image system comprises a light valve and an image capturing unit. The light valve comprises an array of individually addressable pixels capable of generating an image. The image capturing unit comprises a detector having an array of detector pixels capable of capturing images. The detector pixels are correlated with the light valve pixels.Type: GrantFiled: December 14, 2007Date of Patent: June 26, 2012Assignee: Texas Instruments IncorporatedInventors: Roger S. Carver, Leigh Ann Files, Duane Scott Dewald, Walter M. Duncan
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Patent number: 8202433Abstract: In one embodiment, an apparatus for reducing adherence in a micro-electromechanical system (MEMS) device comprises a substrate. A MEMS is disposed outwardly from the substrate. The MEMS comprises structures and corresponding landing pads. Dibs are disposed outwardly from the substrate. Each dib has a surface with depressions. An adherence-reducing material is disposed within each depression. The adherence-reducing material reduces adherence between at least a portion of a structure and a corresponding landing pad.Type: GrantFiled: May 27, 2011Date of Patent: June 19, 2012Assignee: Texas Instruments IncorporatedInventor: Walter M. Duncan
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Patent number: 8144321Abstract: According to one embodiment of the present invention, a system for encoding an optical spectrum includes a dispersive element, a digital micromirror device (DMD) array, a detector, and a controller. The dispersive element receives light from a source and disperses the light to yield light components of different wavelengths. The digital micromirror device (DMD) array has micromirrors that modulate the light to encode an optical spectrum of the light. The detector detects the light that has been modulated. The controller generates an intensity versus time waveform representing the optical spectrum of the detected light.Type: GrantFiled: October 22, 2008Date of Patent: March 27, 2012Assignee: Texas Instruments IncorporatedInventors: Walter M. Duncan, James N. Malina, Rajeev Ramanath
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Publication number: 20110226732Abstract: In one embodiment, an apparatus for reducing adherence in a micro-electromechanical system (MEMS) device comprises a substrate. A MEMS is disposed outwardly from the substrate. The MEMS comprises structures and corresponding landing pads. Dibs are disposed outwardly from the substrate. Each dib has a surface with depressions. An adherence-reducing material is disposed within each depression. The adherence-reducing material reduces adherence between at least a portion of a structure and a corresponding landing pad.Type: ApplicationFiled: May 27, 2011Publication date: September 22, 2011Applicant: TEXAS INSTRUMENTS INCORPORATEDInventor: Walter M. Duncan
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Patent number: 7961376Abstract: In one embodiment, an apparatus for reducing adherence in a micro-electromechanical system (MEMS) device comprises a substrate. A MEMS is disposed outwardly from the substrate. The MEMS comprises structures and corresponding landing pads. Dibs are disposed outwardly from the substrate. Each dib has a surface with depressions. An adherence-reducing material is disposed within each depression. The adherence-reducing material reduces adherence between at least a portion of a structure and a corresponding landing pad.Type: GrantFiled: December 31, 2007Date of Patent: June 14, 2011Assignee: Texas Instruments IncorporatedInventor: Walter M. Duncan
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Patent number: 7901106Abstract: The disclosure in one aspect provides an illuminator that includes a plurality of segmented diodes to generate a plurality of light beams. In another aspect, the illuminator may independently control current to some or all of the diodes.Type: GrantFiled: December 29, 2006Date of Patent: March 8, 2011Assignee: Texas Instruments IncorporatedInventors: Walter M. Duncan, Michael Mignardi, John David Jackson
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Patent number: 7763949Abstract: A process for protecting a MEMS device used in a UV illuminated application from damage due to a photochemical activation between the UV flux and package gas constituents, formed from the out-gassing of various lubricants and passivants put in the device package to prevent sticking of the MEMS device's moving parts. This process coats the exposed surfaces of the MEMS device and package's optical window surfaces with a metal-halide film to eliminate this photochemical activation and therefore significantly extend the reliability and lifetime of the MEMS device.Type: GrantFiled: April 28, 2004Date of Patent: July 27, 2010Assignee: Texas Instruments IncorporatedInventors: Walter M. Duncan, Simon Joshua Jacobs, Michael R. Douglass, Richard O. Gale
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Publication number: 20100165314Abstract: A process for protecting a MEMS device used in a UV illuminated application from damage due to a photochemical activation between the UV flux and package gas constituents, formed from the out-gassing of various lubricants and passivants put in the device package to prevent sticking of the MEMS device's moving parts. This process coats the exposed surfaces of the MEMS device and package's optical window surfaces with a metal-halide film to eliminate this photochemical activation and therefore significantly extend the reliability and lifetime of the MEMS device.Type: ApplicationFiled: April 28, 2004Publication date: July 1, 2010Inventors: Walter M. Duncan, Simon Joshua Jacobs, Michael R. Douglass, Richard O. Gale
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Publication number: 20100097604Abstract: According to one embodiment of the present invention, a system for encoding an optical spectrum includes a dispersive element, a digital micromirror device (DMD) array, a detector, and a controller. The dispersive element receives light from a source and disperses the light to yield light components of different wavelengths. The digital micromirror device (DMD) array has micromirrors that modulate the light to encode an optical spectrum of the light. The detector detects the light that has been modulated. The controller generates an intensity versus time waveform representing the optical spectrum of the detected light.Type: ApplicationFiled: October 22, 2008Publication date: April 22, 2010Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Walter M. Duncan, James N. Malina, Rajeev Ramanath
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Patent number: 7630135Abstract: A method for assuring a blazed condition in a DMD device used in telecommunications applications. By meeting certain conditions in the fabrication and operation of the DMD, the device can achieve a blazed condition and be very effective in switching near monochromatic spatially coherent light, thereby opening up a whole new application field for such devices. This method determines the optimal pixel pitch and mirror tilt angle for a given incident angle and wavelength of near monochromatic spatially coherent light to assure blazed operating conditions. The Fraunhofer envelope is determined by convolving the Fourier transforms of the mirror aperture and the delta function at the center of each mirror and then aligning the center of this envelope with a diffraction order to provide a blazed condition.Type: GrantFiled: September 12, 2005Date of Patent: December 8, 2009Assignee: Texas Instrument IncorporatedInventors: Benjamin L. Lee, Claude E. Tew, Walter M. Duncan
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Publication number: 20090196314Abstract: A laser module includes a Distributed Bragg Reflector semiconductor laser light source that is operable to generate a light beam having a stabilized frequency and spatial mode. A periodically poled, nonlinear optical device is operable to receive the light beam, and frequency-convert the light beam.Type: ApplicationFiled: January 31, 2008Publication date: August 6, 2009Applicant: Texas Instruments IncorporatedInventor: Walter M. Duncan
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Publication number: 20090170324Abstract: In one embodiment, an apparatus for reducing adherence in a micro-electromechanical system (MEMS) device comprises a substrate. A MEMS is disposed outwardly from the substrate. The MEMS comprises structures and corresponding landing pads. Dibs are disposed outwardly from the substrate. Each dib has a surface with depressions. An adherence-reducing material is disposed within each depression. The adherence-reducing material reduces adherence between at least a portion of a structure and a corresponding landing pad.Type: ApplicationFiled: December 31, 2007Publication date: July 2, 2009Applicant: Texas Instruments IncorporatedInventor: Walter M. Duncan
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Publication number: 20090060301Abstract: An image system comprises a light valve and an image capturing unit. The light valve comprises an array of individually addressable pixels capable of generating an image. The image capturing unit comprises a detector having an array of detector pixels capable of capturing images. The detector pixels are correlated with the light valve pixels.Type: ApplicationFiled: December 14, 2007Publication date: March 5, 2009Applicant: Texas Instruments IncorporatedInventors: Roger S. Carver, Leigh Ann Files, Duane Scott Dewald, Walter M. Duncan
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Patent number: 7458691Abstract: Described is an optical device for combining multiple light sources in an optical projection system. One embodiment of the optical device includes at least two light sources having first and second wavelengths, and an optical element for substantially diffracting the first and second wavelengths of the two light sources and combining them into a single beam of light.Type: GrantFiled: June 9, 2005Date of Patent: December 2, 2008Assignee: Texas Instruments IncorporatedInventor: Walter M. Duncan
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Patent number: 7443567Abstract: A method of processing light includes generating a beam of light and periodically diffracting the beam of light by an acoustooptic cell to produce diffracted light having at least one direction change from the generated light. The method further includes spatially integrating the diffracted light and providing the spatially integrated light to a spatial light modulator.Type: GrantFiled: October 25, 2006Date of Patent: October 28, 2008Assignee: Texas Instruments IncorporatedInventor: Walter M. Duncan
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Publication number: 20080158874Abstract: The disclosure in one aspect provides an illuminator that includes a plurality of segmented diodes to generate a plurality of light beams. In another aspect, the illuminator may independently control current to some or all of the diodes.Type: ApplicationFiled: December 29, 2006Publication date: July 3, 2008Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Walter M. Duncan, Michael Mignardi, John David Jackson
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Publication number: 20080100901Abstract: A method of processing light includes generating a beam of light and periodically diffracting the beam of light by an acoustooptic cell to produce diffracted light having at least one direction change from the generated light. The method further includes spatially integrating the diffracted light and providing the spatially integrated light to a spatial light modulator.Type: ApplicationFiled: October 25, 2006Publication date: May 1, 2008Inventor: Walter M. Duncan
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Publication number: 20080012805Abstract: System and method for using predictive pulse modulation in display applications. A preferred embodiment comprises sampling a light output of a light source, computing a usage history of the light source, and processing the samples of the light output in combination with the usage history to characterize the light source. The characterization of the light source can be used in conjunction with a desired light output to determine a current pulse waveform to provide to the light source to have the light source produce the desired light output. The characterization of the light source can occur during normal use of the display system or during manufacture or setup and configuration of the display system.Type: ApplicationFiled: July 13, 2006Publication date: January 17, 2008Inventors: Walter M. Duncan, Fred Jay Reuter, Paul L. Rancuret
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Patent number: 7184201Abstract: According to one embodiment of the present invention, a digital micro-mirror device having improved contrast and a method for the same are provided. The digital micro-mirror device includes a plurality of current-carrying conductors on an upper surface of a substrate, each current-carrying conductor having an upper surface; a low-reflectivity metal disposed upon the upper surfaces of the current-carrying conductors; first and second micro-mirrors forming an aperture above the substrate; and wherein the low-reflectivity metal disposed upon on the upper surfaces of the current-carrying conductors reduces reflection of light received through the aperture by the current-carrying conductors.Type: GrantFiled: November 2, 2004Date of Patent: February 27, 2007Assignee: Texas Instruments IncorporatedInventor: Walter M. Duncan
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Patent number: 6943950Abstract: A method for assuring a blazed condition in a DMD device used in telecommunications applications. By meeting certain conditions in the fabrication and operation of the DMD, the device can achieve a blazed condition and be very effective in switching near monochromatic spatially coherent light, thereby opening up a whole new application field for such devices. This method determines the optimal pixel pitch and mirror tilt angle for a given incident angle and wavelength of near monochromatic spatially coherent light to assure blazed operating conditions. The Fraunhofer envelope is determined by convolving the Fourier transforms of the mirror aperture and the delta function at the center of each mirror and then aligning the center of this envelope with a diffraction order to provide a blazed condition.Type: GrantFiled: August 7, 2001Date of Patent: September 13, 2005Assignee: Texas Instruments IncorporatedInventors: Benjamin L. Lee, Claude E. Tew, Walter M. Duncan