Patents by Inventor Hai Xu

Hai Xu 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: 6362566
    Abstract: Organic electroluminescent apparatus including an organic electroluminescent device for emitting blue-green light. A microcavity structure receives the blue-green light and is tuned to a resonance such that the blue-green light is enhanced to blue and green light. A color converting medium receives and absorbs the blue-green light and emits red light in response thereto.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: March 26, 2002
    Assignee: Motorola, Inc.
    Inventors: Ji-Hai Xu, Hsing-Chung Lee, Song Q. Shi
  • Patent number: 6362018
    Abstract: A micro electro-mechanical systems device having variable capacitance is controllable over the full dynamic range and not subject to the “snap effect” common in the prior art. The device features an electrostatic driver (120) having a driver capacitor of fixed capacitance (121) in series with a second driver capacitor of variable capacitance (126). A MEMS variable capacitor (130) is controlled by applying an actuation voltage potential to the electrostatic driver (120). The electrostatic driver (120) and MEMS variable capacitor (130) are integrated in a single, monolithic device.
    Type: Grant
    Filed: February 2, 2000
    Date of Patent: March 26, 2002
    Assignee: Motorola, Inc.
    Inventors: Ji-Hai Xu, Jenn-Hwa Huang, John Michael Parsey, Jr.
  • Publication number: 20020025595
    Abstract: A micro electromechanical systems device having variable capacitance is controllable over the full dynamic range and not subject to the “snap effect” common in the prior art. The device features an electrostatic driver (120) having a driver capacitor of fixed capacitance (121) in series with a second driver capacitor of variable capacitance (126). A MEMS variable capacitor (130) is controlled by applying an actuation voltage potential to the electrostatic driver (120). The electrostatic driver (120) and MEMS variable capacitor (130) are integrated in a single, monolithic device.
    Type: Application
    Filed: October 16, 2001
    Publication date: February 28, 2002
    Inventors: Ji-Hai Xu, Jenn-Hwa Huang, John Michael Parsey
  • Publication number: 20020011780
    Abstract: Organic electroluminescent apparatus including an organic electroluminescent device for emitting blue-green light. A microcavity structure receives the blue-green light and is tuned to a resonance such that the blue-green light is enhanced to blue and green light. A color converting medium receives and absorbs the blue-green light and emits red light in response thereto.
    Type: Application
    Filed: September 11, 1998
    Publication date: January 31, 2002
    Inventors: JI-HAI XU, Hsing-Chung Lee, Song Q. Shi
  • Patent number: 6326224
    Abstract: A method of purifying a primary color including providing an organic light emitting diode having a diode light output with a broad spectrum that includes a fraction of the primary color. A microcavity structure is formed in cooperation with the organic light emitting diode to define an optical length of the microcavity structure, and the optical length of the microcavity structure being such that light emitted from the microcavity structure is the primary color, purified.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: December 4, 2001
    Assignee: Motorola, Inc.
    Inventors: Ji-Hai Xu, Franky So, Hsing-Chung Lee
  • Patent number: 6307169
    Abstract: A Micro-Electromechanical System (MEMS) switch (100) having a single, center hinge (120) which supports a membrane-type electrode (104) on a substrate (101). The single, center hinge (120) has a control electrode (104) coupled to the substrate (101) by an anchor (113), a hinge collar (121), a set of hinge arms (122, 123). The control electrode (104) has a shorting bar (106) coupled thereto and is electrically isolated from another control electrode (105), which is formed on the substrate (101). A travel stop (130) is positioned between the substrate and the control electrode (104). Another aspect of the present invention is a Single Pole, Double Throw (SPDT) switch (160) into which is incorporated the single, center hinge (170) and the travel stop (185, 186).
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: October 23, 2001
    Assignee: Motorola Inc.
    Inventors: Xi-Qing Sun, John Michael Parsey, Jr., Jenn-Hwa Huang, Ji-Hai Xu
  • Publication number: 20010009690
    Abstract: An organic electroluminescent device with enhanced performance includes anode and cathode electrodes with organic material, single or multiple layers, positioned therebetween and in juxtaposition to each of the electrodes. The organic material is doped with an AMC dopant with a concentration in a range of approximately 0.1 Wt % to 15 Wt % in a region of the organic material adjacent to the cathode electrode. This doped region has a thickness in a range of approximately 20 Å to 600 Å. The dopant includes either a low work function alkaline metal compound, such as LiF, LiCl, KBr, MgF2, LiO2, MgOx, CaOx, and CsOx or a low work function alkaline metal alloy, such as Li-Al, Li-In, Sr-Al, Cs-Al.
    Type: Application
    Filed: February 14, 2000
    Publication date: July 26, 2001
    Inventors: Vi-en Choong, Ji-Hai Xu, Franky So, Song Q. Shi
  • Patent number: 6140764
    Abstract: Organic electroluminescent apparatus including an organic electroluminescent device (11) for emitting blue to blue-green light. A microcavity structure (12) receives the blue to blue-green light and has an optical length such that the blue to blue-green light is enhanced to blue light. A color converting medium (23) receives and absorbs the blue light and emits red light in response thereto.
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: October 31, 2000
    Assignee: Motorola, Inc.
    Inventors: Ji-Hai Xu, Hsing-Chung Lee, Song Q. Shi
  • Patent number: 6133692
    Abstract: A white light generating organic electroluminescent device including an organic light emitting diode emitting a broad spectrum light including a component of each primary color. A multi-mode microcavity structure is positioned to cooperate with the diode defining an optical length of the microcavity structure to enhance the broad spectrum light and obtain multiple resonant peaks, one at each primary color. A plurality of filters are positioned to receive and adjust the multiple resonant peaks to provide substantially balanced multiple resonant peaks.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: October 17, 2000
    Assignee: Motorola, Inc.
    Inventors: Ji-Hai Xu, Thomas B. Harvey, III
  • Patent number: 6111270
    Abstract: Light emitting apparatus is disclosed including a thin film transistor, a capacitor and an organic electroluminescent device. The thin film transistor includes a semiconductive layer having spaced apart first and second doped regions defining first and second current carrying terminals with a channel therebetween, an insulating layer overlying the channel and a control terminal formed on the insulating layer. A portion of the control terminal overlies a portion of the first doped region to form the capacitor. The organic electroluminescent device includes a first terminal connected to the second current carrying terminal.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: August 29, 2000
    Assignee: Motorola, Inc.
    Inventors: Ji-Hai Xu, Franky So, Hsing-Chung Lee
  • Patent number: 6111361
    Abstract: Light emitting apparatus comprising a thin film transistor having a current carrying terminal, an organic electroluminescent device for emitting light having a broad spectrum and having a first terminal connected to current carrying terminal, a color converting medium for absorbing light coupled thereto and emitting light in response to absorbed light, and a microcavity coupling emitted light from the organic electroluminescent device to the color converting medium.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: August 29, 2000
    Assignee: Motorola, Inc.
    Inventors: Ji-Hai Xu, Franky So, Hsing-Chung Lee
  • Patent number: 6084347
    Abstract: An organic electroluminescent display device includes a plurality of pixels formed on a substrate, each pixel including a plurality of different light influencing elements disposed on the substrate. Deposited atop each light influencing element is an organic electroluminescent display element which is adapted to emit light of a preselected wavelength. A layer of an insulating, planarizing material is disposed between the light influencing elements and the OED. Each of the light influencing elements is adapted to generate a different effect in response to light of a preselected wavelength incident thereon. In this way, it is possible to achieve a red, green, blue organic electroluminescent display assembly using a single organic electroluminescent display device.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: July 4, 2000
    Assignee: Motorola, Inc.
    Inventors: Ji-Hai Xu, Song Q. Shi
  • Patent number: 6064151
    Abstract: An organic electroluminescent device with enhanced performance includes anode and cathode electrodes with organic material, single or multiple layers, positioned therebetween and in juxtaposition to each of the electrodes. The organic material is doped with an AMC dopant with a concentration in a range of approximately 0.1 Wt % to 15 Wt % in a region of the organic material adjacent to the cathode electrode. This doped region has a thickness in a range of approximately 20 .ANG. to 600 .ANG.. The dopant includes either a low work function alkaline metal compound, such as LiF, LiCl, KBr, MgF.sub.2, LiO.sub.2, MgO.sub.x, CaO.sub.x, and CsO.sub.x or a low work function alkaline metal alloy, such as Li--Al, Li--In, Sr--Al, Cs--Al.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: May 16, 2000
    Assignee: Motorola, Inc.
    Inventors: Vi-en Choong, Ji-Hai Xu, Franky So, Song Q. Shi
  • Patent number: 5949187
    Abstract: An OED with a first microcavity including a first transparent spacer positioned adjacent the diode light output and a first mirror stack positioned on the first spacer to reflect light back into the OED and to define an optical length of the first microcavity. The optical length of the first microcavity being such that light emitted from the first microcavity has a first spectrum. A second microcavity including a second transparent spacer positioned adjacent the first microcavity and a second mirror stack positioned on the second spacer to reflect light toward the first microcavity and to define an optical length of the second microcavity. The optical length of the second microcavity being such that light emitted from the second microcavity has a second spectrum. Additional microcavities can be placed in the structure to further enhance and alter the light spectrum.
    Type: Grant
    Filed: July 29, 1997
    Date of Patent: September 7, 1999
    Assignee: Motorola, Inc.
    Inventors: Ji-Hai Xu, Rong-Ting Huang, Franky So
  • Patent number: 5367311
    Abstract: The antenna of the present invention includes an ultrashort antenna element which has an electrical length of lambda/2, a transmission path one end of which is connected to the base of the antenna element, a ground plane obtained from a sheet-form conductive member with an electrical length of lambda/4 which is bent into a U-shape so that first and second portions face each other with the first portion being installed parallel to the transmission path in close proximity to the transmission path so as to create a capacitive coupling with the transmission path, a capacitive coupling member installed at one end of the first portion so that a capacitive coupling is formed between the capacitive coupling member and ground and a coaxial cable with its central conductor connected to an other end of the transmission path and its outer conductor connected to one end of the second portion of the ground plane.
    Type: Grant
    Filed: November 9, 1992
    Date of Patent: November 22, 1994
    Assignee: Harada Kogyo Kabushiki Kaisha
    Inventors: Yoshimi Egashira, Hai Xu