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).

  • Patent number: 8208759
    Abstract: 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: Grant
    Filed: December 14, 2007
    Date of Patent: June 26, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Roger S. Carver, Leigh Ann Files, Duane Scott Dewald, Walter M. Duncan
  • Patent number: 8202433
    Abstract: 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: Grant
    Filed: May 27, 2011
    Date of Patent: June 19, 2012
    Assignee: Texas Instruments Incorporated
    Inventor: Walter M. Duncan
  • Patent number: 8144321
    Abstract: 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: Grant
    Filed: October 22, 2008
    Date of Patent: March 27, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Walter M. Duncan, James N. Malina, Rajeev Ramanath
  • Publication number: 20110226732
    Abstract: 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: Application
    Filed: May 27, 2011
    Publication date: September 22, 2011
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Walter M. Duncan
  • Patent number: 7961376
    Abstract: 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: Grant
    Filed: December 31, 2007
    Date of Patent: June 14, 2011
    Assignee: Texas Instruments Incorporated
    Inventor: Walter M. Duncan
  • Patent number: 7901106
    Abstract: 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: Grant
    Filed: December 29, 2006
    Date of Patent: March 8, 2011
    Assignee: Texas Instruments Incorporated
    Inventors: Walter M. Duncan, Michael Mignardi, John David Jackson
  • Patent number: 7763949
    Abstract: 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: Grant
    Filed: April 28, 2004
    Date of Patent: July 27, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Walter M. Duncan, Simon Joshua Jacobs, Michael R. Douglass, Richard O. Gale
  • Publication number: 20100165314
    Abstract: 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: Application
    Filed: April 28, 2004
    Publication date: July 1, 2010
    Inventors: Walter M. Duncan, Simon Joshua Jacobs, Michael R. Douglass, Richard O. Gale
  • Publication number: 20100097604
    Abstract: 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: Application
    Filed: October 22, 2008
    Publication date: April 22, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Walter M. Duncan, James N. Malina, Rajeev Ramanath
  • Patent number: 7630135
    Abstract: 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: Grant
    Filed: September 12, 2005
    Date of Patent: December 8, 2009
    Assignee: Texas Instrument Incorporated
    Inventors: Benjamin L. Lee, Claude E. Tew, Walter M. Duncan
  • Publication number: 20090196314
    Abstract: 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: Application
    Filed: January 31, 2008
    Publication date: August 6, 2009
    Applicant: Texas Instruments Incorporated
    Inventor: Walter M. Duncan
  • Publication number: 20090170324
    Abstract: 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: Application
    Filed: December 31, 2007
    Publication date: July 2, 2009
    Applicant: Texas Instruments Incorporated
    Inventor: Walter M. Duncan
  • Publication number: 20090060301
    Abstract: 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: Application
    Filed: December 14, 2007
    Publication date: March 5, 2009
    Applicant: Texas Instruments Incorporated
    Inventors: Roger S. Carver, Leigh Ann Files, Duane Scott Dewald, Walter M. Duncan
  • Patent number: 7458691
    Abstract: 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: Grant
    Filed: June 9, 2005
    Date of Patent: December 2, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Walter M. Duncan
  • Patent number: 7443567
    Abstract: 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: Grant
    Filed: October 25, 2006
    Date of Patent: October 28, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Walter M. Duncan
  • Publication number: 20080158874
    Abstract: 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: Application
    Filed: December 29, 2006
    Publication date: July 3, 2008
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Walter M. Duncan, Michael Mignardi, John David Jackson
  • Publication number: 20080100901
    Abstract: 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: Application
    Filed: October 25, 2006
    Publication date: May 1, 2008
    Inventor: Walter M. Duncan
  • Publication number: 20080012805
    Abstract: 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: Application
    Filed: July 13, 2006
    Publication date: January 17, 2008
    Inventors: Walter M. Duncan, Fred Jay Reuter, Paul L. Rancuret
  • Patent number: 7184201
    Abstract: 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: Grant
    Filed: November 2, 2004
    Date of Patent: February 27, 2007
    Assignee: Texas Instruments Incorporated
    Inventor: Walter M. Duncan
  • Patent number: 6943950
    Abstract: 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: Grant
    Filed: August 7, 2001
    Date of Patent: September 13, 2005
    Assignee: Texas Instruments Incorporated
    Inventors: Benjamin L. Lee, Claude E. Tew, Walter M. Duncan