Patents by Inventor Maniam Selvan

Maniam Selvan 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).

  • Light source having more than three LEDs in which the color points are maintained using a three channel color sensor
    Patent number: 7315139
    Abstract: A light source having first, second, and third component light sources that are driven by first, second, and third primary drive circuits is disclosed. Each primary drive circuit provides an average current to a corresponding one of the component light sources. A photodetector and processor generate three intensity signals representing the intensity of light produced by each of the component light sources. A servo loop adjusts the drive circuits so as to maintain the intensity signals at corresponding target values. One of the compound light sources includes first and second LEDs that are driven such that the currents through the LEDs are maintained at a fixed ratio by a secondary drive circuit that is connected to the third primary drive circuit. The magnitude of the currents is determined by the third primary drive circuit.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: January 1, 2008
    Assignee: Avago Technologis ECBU IP (Singapore) Pte Ltd
    Inventors: Maniam Selvan, Yoke Peng Boay, Hooi Choo Kang