Patents by Inventor Hsin-Mei Wu

Hsin-Mei Wu 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: 9078331
    Abstract: A light emitting device is provided to produce white light with a stable correlated color temperature and stable color coordinates. The light emitting device includes a blue LED chip and a yellow phosphor. The blue LED chip has a peak wavelength X slightly smaller than the peak wavelength Y of the phosphor such that when the light emitting device is subjected to a predetermined operating current, the phosphor decays due to thermal effect, and the LED chip has its emission spectrum red-shifted to substantially match with the excitation spectrum of the phosphor. At this time, the excitation ability of the LED chip is increased and causes an increase of yellow power output from the phosphor that substantially compensates a decrease of yellow light output caused by the phosphor.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: July 7, 2015
    Assignee: National Central University
    Inventors: Ching-Cherng Sun, Ching-Yi Chen, Hsin-Mei Wu, Cheng-Chien Chen
  • Publication number: 20130257265
    Abstract: A light emitting device is provided to produce white light with a stable correlated color temperature and stable color coordinates. The light emitting device includes a blue LED chip and a yellow phosphor. The blue LED chip has a peak wavelength X slightly smaller than the peak wavelength Y of the phosphor such that when the light emitting device is subjected to a predetermined operating current, the phosphor decays due to thermal effect, and the LED chip has its emission spectrum red-shifted to substantially match with the excitation spectrum of the phosphor. At this time, the excitation ability of the LED chip is increased and causes an increase of yellow power output from the phosphor that substantially compensates a decrease of yellow light output caused by the phosphor.
    Type: Application
    Filed: May 28, 2013
    Publication date: October 3, 2013
    Applicant: NATIONAL CENTRAL UNIVERSITY
    Inventors: Ching-Cherng SUN, Ching-Yi CHEN, Hsin-Mei WU, Cheng-Chien CHEN
  • Publication number: 20130069522
    Abstract: The present invention relates to a way of reducing LED's color temperature and color coordinates drifting, more particularly to a phosphor-converted LED with blue ray light emitting body so that the influence of LED's heat dissipation on color performance can be minimized.
    Type: Application
    Filed: September 15, 2011
    Publication date: March 21, 2013
    Applicant: National Central University
    Inventors: Ching-Cherng Sun, Ching-Yi Chen, Hsin-Mei Wu, Cheng-Chien Chen