Patents by Inventor David W. Lum

David W. Lum 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).

  • Publication number: 20120281008
    Abstract: Method and apparatus for adjusting the display characteristics of an electronic display, such as a computer or television display. The display is color corrected, e.g., at the factory, to measure its white point correction, gamma and gray tracking correction, and the gain correction over time as the display warms up. Moreover the white point correction and the gamma correction are performed on a per unit basis for each individual display to be manufactured. The resulting correction parameters are stored in memory or firmware associated with the display. Thereby when the display is in use, it performs compensation for white point, gray tracking and gain correction as the display warms up, each time it is powered up or when its thermal operation conditions change.
    Type: Application
    Filed: May 3, 2011
    Publication date: November 8, 2012
    Inventors: Gabriel Gheorghe MARCU, Wei CHEN, David W. LUM, Jean-Jacques P. DROLET
  • Patent number: 8242707
    Abstract: A method, system, and apparatus that can be used to operate a display device in an energy efficient manner. The energy efficient display device can effectively and efficiently compensate for changes in ambient light incident at a display screen of the display device using an internal ambient light sensor to provide control signals to a backlight driver.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: August 14, 2012
    Assignee: Apple Inc.
    Inventor: David W. Lum
  • Patent number: 8237718
    Abstract: A display unit is constituted by a passive matrix of independently controllable pixels characterized by an active area of n rows and m columns of discrete pixels and a pixel border. The pixel border has a predetermined width, in one embodiment two pixels. The border pixel color state is controlled herein by the frame buffer memory. The pixel border color state is controlled to correspond to information contained in a frame buffer memory locus. This locus may be, in various embodiments herein, a single pixel, a row of pixels, or a number of rows of pixels of frame buffer memory. Each row of pixels may be equal to m and/or n. In one embodiment, the frame buffer controls the border pixels directly via a liquid crystal display controller and drivers, without a timing generation mechanism, such as a timing ASIC.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: August 7, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: David W. Lum, Yichang Chan
  • Publication number: 20120026202
    Abstract: The disclosed embodiments relate to a system that communicates a change in a display setting from a display to a host system for the display. During operation, the system determines at the display that the display setting has changed. Next, in response to the change, the system sends an interrupt from the display to the host system through a first interface, wherein the interrupt informs the host system that the display setting has changed. After sending the interrupt to the host system, the system receives a request from the host system to obtain values for one or more display settings including the changed display setting. In response to the request, the system sends updated values for the one or more display settings to the host system.
    Type: Application
    Filed: October 4, 2010
    Publication date: February 2, 2012
    Applicant: APPLE INC.
    Inventors: Maciej Maciesowicz, Jack I. Fu, David W. Lum
  • Publication number: 20120019151
    Abstract: A method, system, and apparatus that can be used to operate a display device in an energy efficient manner. The energy efficient display device can effectively and efficiently compensate for changes in ambient light incident at a display screen of the display device using an internal ambient light sensor to provide control signals to a backlight driver.
    Type: Application
    Filed: July 26, 2010
    Publication date: January 26, 2012
    Applicant: APPLE INC.
    Inventor: David W. Lum
  • Publication number: 20120019494
    Abstract: A method, system, and apparatus that can be used to operate a display device in an energy efficient manner. The energy efficient display device can effectively and efficiently compensate for changes in ambient light incident at a display screen of the display device using an internal ambient light sensor to provide control signals to a backlight driver.
    Type: Application
    Filed: January 14, 2011
    Publication date: January 26, 2012
    Applicant: APPLE INC.
    Inventors: David W. Lum, Ulrich Barnhoefer, Nyok Khiam Lam, Paolo Sacchetto
  • Publication number: 20110316867
    Abstract: A display unit is constituted by a passive matrix of independently controllable pixels characterized by an active area of n rows and m columns of discrete pixels and a pixel border. The pixel border has a predetermined width, in one embodiment two pixels. The border pixel color state is controlled herein by the frame buffer memory. The pixel border color state is controlled to correspond to information contained in a frame buffer memory locus. This locus may be, in various embodiments herein, a single pixel, a row of pixels, or a number of rows of pixels of frame buffer memory. Each row of pixels may be equal to m and/or n. In one embodiment, the frame buffer controls the border pixels directly via a liquid crystal display controller and drivers, without a timing generation mechanism, such as a timing ASIC.
    Type: Application
    Filed: May 25, 2010
    Publication date: December 29, 2011
    Applicant: PALM, INC.
    Inventors: David W. Lum, Yichang Chan
  • Patent number: 7724270
    Abstract: A display unit is constituted by a passive matrix of independently controllable pixels characterized by an active area of n rows and m columns of discrete pixels and a pixel border. The pixel border has a predetermined width, in one embodiment two pixels. The border pixel color state is controlled herein by the frame buffer memory. The pixel border color state is controlled to correspond to information contained in a frame buffer memory locus. This locus may be, in various embodiments herein, a single pixel, a row of pixels, or a number of rows of pixels of frame buffer memory. Each row of pixels may be equal to m and/or n. In one embodiment, the frame buffer controls the border pixels directly via a liquid crystal display controller and drivers, without a timing generation mechanism, such as a timing ASIC.
    Type: Grant
    Filed: November 1, 2004
    Date of Patent: May 25, 2010
    Assignee: Palm, Inc.
    Inventors: David W. Lum, Yichang Chan
  • Publication number: 20100091531
    Abstract: Methods and systems for managing power are described. In one embodiment of a method, a DC input voltage from an AC mains to DC converter, inputted to a DC to DC converter, is adjusted lower while maintaining substantially constant DC output voltage from the DC to DC converter in order to improve power efficiency.
    Type: Application
    Filed: October 13, 2008
    Publication date: April 15, 2010
    Applicant: Apple Inc.
    Inventor: David W. Lum
  • Patent number: 7425970
    Abstract: A display device having a display matrix including a pixel border of width x and located around the edge locations of the matrix for improved viewability. In particular, the border can be several pixels wide, e.g., 1<x<5. In one embodiment, the border region is two pixels wide and surrounds a display region in which images are generated from a frame buffer memory. Both the border region and the display region are implemented using a negative mode passive display matrix using liquid crystal display (LCD) technology. The pixels of the border are controllable between an on state and an off state and have an adjustable threshold voltage level. In one embodiment, the display screen is a negative mode display in which the pixels are normally black when off. The pixel border is useful in providing contrast in display modes having a white background with black characters displayed therein.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: September 16, 2008
    Assignee: Palm, Inc.
    Inventors: Shawn R. Gettemy, Sherridythe Fraser, David W. Lum
  • Patent number: 6831662
    Abstract: A display unit is constituted by a passive matrix of independently controllable pixels characterized by an active area of n rows and m columns of discrete pixels and a pixel border. The pixel border has a predetermined width, in one embodiment two pixels. The border pixel color state is controlled herein by the frame buffer memory. The pixel border color state is controlled to correspond to information contained in a frame buffer memory locus. This locus may be, in various embodiments herein, a single pixel, a row of pixels, or a number of rows of pixels of frame buffer memory. Each row of pixels may be equal to m and/or n. In one embodiment, the frame buffer controls the border pixels directly via a liquid crystal display controller and drivers, without a timing generation mechanism, such as a timing ASIC.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: December 14, 2004
    Assignee: palmOne, Inc.
    Inventors: David W. Lum, Yichang Chan