Patents by Inventor Sajjad Ali

Sajjad Ali 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: 7956941
    Abstract: According to one embodiment, a method for reducing speckle in an image produced from a coherent light source includes directing a beam of coherent light at an electrically controlled diffuser. An electrical signal is applied to the electrically controlled diffuser to produce an electrical field across the electrically controlled diffuser layer. At least one of an amplitude and a frequency of the electrical signal are varied to transition the controlled diffuser between a first state and a second state. The varied application of the electrical signal operates to reduce spatial coherence in an image projected through the electrically controlled diffuser.
    Type: Grant
    Filed: August 1, 2007
    Date of Patent: June 7, 2011
    Assignee: Texas Instruments Incorporated
    Inventor: Sajjad Ali Khan
  • Patent number: 7782521
    Abstract: A system and method for reducing visible speckle in images displayed using coherent light. In an embodiment, a system for displaying images includes a light source to produce coherent light, an array of light modulators optically coupled to the light source and positioned in a light path of the light source after the light source, and a controller electronically coupled to the array of light modulators and to the light source. The light source includes a coherent light source, and a first digital micromirror device (DMD) having a first plurality of micromirrors. The first DMD is optically coupled to the coherent light source and positioned in a light path of the coherent light source after the coherent light source. The first DMD directs coherent light by moving the micromirrors of the first plurality of micromirrors through a first range of tilt angles substantially continuously.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: August 24, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Sajjad Ali Khan, Terry Alan Bartlett
  • Publication number: 20090167845
    Abstract: In one embodiment, a method of rendering stereoscopic images includes providing eyewear having a pair of lenses. Each lens is transitioned between an optically-shuttered state and an optically-transmissive state. The transitioning is in response to a voltage waveform applied substantially simultaneously to at least a portion of each lens. Each lens transitions between states in opposition to the other lens.
    Type: Application
    Filed: December 27, 2007
    Publication date: July 2, 2009
    Applicant: Texas Instruments Incorporated
    Inventor: Sajjad Ali Khan
  • Publication number: 20090048332
    Abstract: New antioxidants derived from lichen extracts are reported; lecanoric acid, erythrin, sekikaic acid, and lobaric acid were reported as potent natural antioxidants for the treatment of disease and protection of products from the effect of oxidizing components.
    Type: Application
    Filed: August 14, 2007
    Publication date: February 19, 2009
    Applicants: HEJ Research Insitute, University of Peradeniya
    Inventors: Muhammad Iqbal Choudhary, Sajjad Ali, Vinitha M Thadani, Veranja Karunaratne
  • Publication number: 20090033814
    Abstract: According to one embodiment, a method for reducing speckle in an image produced from a coherent light source includes directing a beam of coherent light at an electrically controlled diffuser. An electrical signal is applied to the electrically controlled diffuser to produce an electrical field across the electrically controlled diffuser layer. At least one of an amplitude and a frequency of the electrical signal are varied to transition the controlled diffuser between a first state and a second state. The varied application of the electrical signal operates to reduce spatial coherence in an image projected through the electrically controlled diffuser.
    Type: Application
    Filed: August 1, 2007
    Publication date: February 5, 2009
    Inventor: Sajjad Ali Khan
  • Publication number: 20080298424
    Abstract: A system and method for reducing visible speckle in images displayed using coherent light. In an embodiment, a system for displaying images includes a light source to produce coherent light, an array of light modulators optically coupled to the light source and positioned in a light path of the light source after the light source, and a controller electronically coupled to the array of light modulators and to the light source. The light source includes a coherent light source, and a first digital micromirror device (DMD) having a first plurality of micromirrors. The first DMD is optically coupled to the coherent light source and positioned in a light path of the coherent light source after the coherent light source. The first DMD directs coherent light by moving the micromirrors of the first plurality of micromirrors through a first range of tilt angles substantially continuously.
    Type: Application
    Filed: May 31, 2007
    Publication date: December 4, 2008
    Inventors: Sajjad Ali Khan, Terry Alan Bartlett
  • Publication number: 20080192501
    Abstract: System and method for reducing visible speckle in images displayed using coherent light. An embodiment comprises a first layer in a light path of a display plane, the first layer collimates and diffuses light passing through the first layer from a light source side of the display plane along the light path, an actuator coupled to the first layer, the actuator moves the first layer in plane orthogonal to the light path, and a second layer in the light path on a viewing side of the display plane, the second layer increases a viewing angle of the display plane. The actuator continuously moves the first layer so that the light passing through the first layer is diffused to reduce the appearance of speckles.
    Type: Application
    Filed: February 12, 2007
    Publication date: August 14, 2008
    Inventors: Terry A. Bartlett, Sajjad Ali Khan