Patents by Inventor Chi Wing Keung

Chi Wing Keung 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: 9349911
    Abstract: A high-resolution, Active Matrix (AM) programmed monolithic Light Emitting Diode (LED) micro-array is fabricated using flip-chip technology. The fabrication process includes fabrications of an LED micro-array and an AM panel, and combining the resulting LED micro-array and AM panel using the flip-chip technology. The LED micro-array is grown and fabricated on a sapphire substrate and the AM panel can be fabricated using CMOS process. LED pixels in a same row share a common N-bus line that is connected to the ground of AM panel while p-electrodes of the LED pixels are electrically separated such that each p-electrode is independently connected to an output of drive circuits mounted on the AM panel. The LED micro-array is flip-chip bonded to the AM panel so that the AM panel controls the LED pixels individually and the LED pixels exhibit excellent emission uniformity. According to this constitution, incompatibility between the LED process and the CMOS process can be eliminated.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: May 24, 2016
    Assignee: NANO AND ADVANCED MATERIALS INSTITUTE LIMITED
    Inventors: Kei May Lau, Chi Wing Keung, Zhaojun Liu
  • Publication number: 20140008667
    Abstract: A high-resolution, Active Matrix (AM) programmed monolithic Light Emitting Diode (LED) micro-array is fabricated using flip-chip technology. The fabrication process includes fabrications of an LED micro-array and an AM panel, and combining the resulting LED micro-array and AM panel using the flip-chip technology. The LED micro-array is grown and fabricated on a sapphire substrate and the AM panel can be fabricated using CMOS process. LED pixels in a same row share a common N-bus line that is connected to the ground of AM panel while p-electrodes of the LED pixels are electrically separated such that each p-electrode is independently connected to an output of drive circuits mounted on the AM panel. The LED micro-array is flip-chip bonded to the AM panel so that the AM panel controls the LED pixels individually and the LED pixels exhibit excellent emission uniformity. According to this constitution, incompatibility between the LED process and the CMOS process can be eliminated.
    Type: Application
    Filed: September 10, 2013
    Publication date: January 9, 2014
    Applicant: NANO AND ADVANCED MATERIALS INSTITUTE LIMITED
    Inventors: Kei May LAU, Chi Wing KEUNG, Zhaojun LIU
  • Patent number: 8557616
    Abstract: A high-resolution, Active Matrix (AM) programmed monolithic Light Emitting Diode (LED) micro-array is fabricated using flip-chip technology. The fabrication process includes fabrications of an LED micro-array and an AM panel, and combining the resulting LED micro-array and AM panel using the flip-chip technology. The LED micro-array is grown and fabricated on a sapphire substrate and the AM panel can be fabricated using CMOS process. LED pixels in a same row share a common N-bus line that is connected to the ground of AM panel while p-electrodes of the LED pixels are electrically separated such that each p-electrode is independently connected to an output of drive circuits mounted on the AM panel. The LED micro-array is flip-chip bonded to the AM panel so that the AM panel controls the LED pixels individually and the LED pixels exhibit excellent emission uniformity. According to this constitution, incompatibility between the LED process and the CMOS process can be eliminated.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: October 15, 2013
    Assignee: Nano and Advanced Materials Institute Limited
    Inventors: Kei May Lau, Chi Wing Keung, Zhaojun Liu
  • Publication number: 20110309378
    Abstract: A high-resolution, Active Matrix (AM) programmed monolithic Light Emitting Diode (LED) micro-array is fabricated using flip-chip technology. The fabrication process includes fabrications of an LED micro-array and an AM panel, and combining the resulting LED micro-array and AM panel using the flip-chip technology. The LED micro-array is grown and fabricated on a sapphire substrate and the AM panel can be fabricated using CMOS process. LED pixels in a same row share a common N-bus line that is connected to the ground of AM panel while p-electrodes of the LED pixels are electrically separated such that each p-electrode is independently connected to an output of drive circuits mounted on the AM panel. The LED micro-array is flip-chip bonded to the AM panel so that the AM panel controls the LED pixels individually and the LED pixels exhibit excellent emission uniformity. According to this constitution, incompatibility between the LED process and the CMOS process can be eliminated.
    Type: Application
    Filed: June 1, 2010
    Publication date: December 22, 2011
    Applicant: Nano and Advanced Materials Institute Limited
    Inventors: Kei May Lau, Chi Wing Keung, Zhaojun Liu
  • Publication number: 20110285284
    Abstract: The present invention relates to a light emitting device using AC, comprising: at least one LED chip and an AC driving circuit chip, wherein the AC driving circuit chip comprises a substrate and a rectifying circuit integrated on the substrate. The LED chip is flipped and bonded on the AC driving circuit chip by flip-chip technology and electrically connected to the rectifying circuit, and the AC driving circuit chip converts the AC into DC for supply to the LED chip. The present invention further relates to a method of manufacturing the light emitting device using AC, comprising the following steps of: (1) forming an LED chip; (2) integrating a rectifying circuit on a substrate, forming two power source connecting terminals on the substrate, and forming an AC driving circuit chip; and (3) flip-chip bonding the LED chip on the AC driving circuit chip and in electrical connection with the rectifying circuit on the substrate.
    Type: Application
    Filed: October 25, 2010
    Publication date: November 24, 2011
    Applicant: APT Electronics Ltd.
    Inventors: Yugang Zhou, Zhaoming Zeng, Yin Hing Lai, Chi Wing Keung, Chaojun Xu, Ruizhen Wang, Guowei David Xiao