Patents by Inventor Xiao-Chang Li

Xiao-Chang Li 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: 7795802
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Grant
    Filed: July 18, 2005
    Date of Patent: September 14, 2010
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
  • Patent number: 7709100
    Abstract: An organic light emitting device is provided. The device has an anode, a cathode, and an emissive layer disposed between the anode and the cathode. The emissive layer further includes a molecule of Formula I (shown below) wherein an alkyl substituent at position R?5, which is an alkyl substituent, results in high efficiency and operational stability in the organic light emitting device.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: May 4, 2010
    Assignee: Universal Display Corporation
    Inventors: Raymond Kwong, David Knowles, Bin Ma, Xiao-Chang Li, William Ceyrolles
  • Patent number: 7365141
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Grant
    Filed: March 13, 2006
    Date of Patent: April 29, 2008
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
  • Publication number: 20070024603
    Abstract: A device for digitally generating a plurality of still pictures consist of a bistable reflective full color flat panel display such as an interference modulation flat panel display (IMD), a coated non-glare coating on the viewing side of the display panel, a cartridge shaped CPU, and a cartridge shaped audio/video playback system which are located in the picture frame. The reflective display disclosed in this patent resembles a traditional painting or photograph, and allows better viewability and reduces eye fatigue linked with luminous display device. The reflective flat panel display has bistable characteristics and therefore it consumes extremely low power in a still picture display state, and it is preferably powered by a set of batteries. The device is a structure resembling a framed picture, portrait, or a painting used in a home, hotel, museum, gallery, building corridor, or any people gathering place, and the displayed content can be easily changed digitally.
    Type: Application
    Filed: July 28, 2005
    Publication date: February 1, 2007
    Inventor: Xiao-Chang Li
  • Patent number: 7154114
    Abstract: An organic light emitting device is provided. The device has an anode, a cathode and an organic layer disposed between the anode and the cathode.
    Type: Grant
    Filed: January 10, 2005
    Date of Patent: December 26, 2006
    Assignees: Universal Display Corporation, The University of Southern California
    Inventors: Jason Brooks, Xiao-Chang Li, Bert Alleyne, Mark E. Thompson, Peter Djurovich, Arnold Tamayo
  • Patent number: 7105621
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: September 12, 2006
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
  • Publication number: 20060151782
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Application
    Filed: March 13, 2006
    Publication date: July 13, 2006
    Applicant: Cambridge Display Technology Ltd.
    Inventors: Andrew Holmes, Xiao-Chang Li, Stephen Moratti, Kenneth Murray, Richard Friend
  • Publication number: 20060008673
    Abstract: An organic light emitting device is provided. The device has an anode, a cathode, and an emissive layer disposed between the anode and the cathode. The emissive layer further includes a molecule of Formula I wherein an alkyl substituent at position R?5 results in high efficiency and operational stability in the organic light emitting device.
    Type: Application
    Filed: December 21, 2004
    Publication date: January 12, 2006
    Inventors: Raymond Kwong, David Knowles, Bin Ma, Xiao-Chang Li, William Ceyrolles
  • Publication number: 20050282983
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Application
    Filed: July 18, 2005
    Publication date: December 22, 2005
    Applicant: Cambridge Display Technology Ltd.
    Inventors: Andrew Holmes, Xiao-Chang Li, Stephen Moratti, Kenneth Murray, Richard Friend
  • Publication number: 20050260447
    Abstract: An organic light emitting device is provided. The device has an anode, a cathode and an organic layer disposed between the anode and the cathode.
    Type: Application
    Filed: January 10, 2005
    Publication date: November 24, 2005
    Inventors: Jason Brooks, Xiao-Chang Li, Bert Alleyne, Mark Thompson, Peter Djurovich, Arnold Tamayo
  • Patent number: 6919415
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: July 19, 2005
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
  • Publication number: 20050031898
    Abstract: A pyrene based compound and its use in an organic light emitting device (OLED) according to the following formula: In the above formula, Z1 represents a hydrogen atom, deuterium atom, oxygen atom, silicon atom, selenium atom, substituted or unsubstituted aryl group, substituted or unsubstituted heteroaryl group, substituted or unsubstituted aryl amine or a combination thereof, and Z2 represents a hydrogen or deuterium atom. One of Y1 and Y2 represents a hydrogen atom, deuterium atom, oxygen atom, silicon atom, selenium atom, a substituted or unsubstituted aryl group, substituted or unsubstituted heteroaryl group, substituted or unsubstituted aryl amine or a combination thereof, and the other of Y1 and Y2 represents a hydrogen or deuterium atom. X1 through X6 independently represent hydrogen atoms, deuterium atoms, alkyl groups or aryl groups, and at least one of X1 through X6 represents a bulky alkyl group or bulky aryl group.
    Type: Application
    Filed: August 6, 2003
    Publication date: February 10, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventors: Xiao-Chang Li, Yoshimasa Okamura, Kazunori Ueno, Masashi Tashiro, Hideki Tashiro, G.K. Prakash
  • Patent number: 6830830
    Abstract: The invention is directed to oxidized charge transport materials having hole transport capability in organic light emitting device (OLEDs). A charge transport compound including more than two triarylamine groups, or including at least one triarylamine group and at least one fluorene group, is partly complexed with an oxidant, such as a Lewis acid, preferably present in an amount between 0.2 and 20 percent by weight. The resulting charge transport materials exhibit good hole transport characteristics and film forming properties.
    Type: Grant
    Filed: April 18, 2002
    Date of Patent: December 14, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventors: Bing R. Hsieh, Xiao-Chang Li, Alan Sellinger, Ghassan E. Jabbour
  • Patent number: 6723811
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: April 20, 2004
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
  • Publication number: 20040059077
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Application
    Filed: August 15, 2003
    Publication date: March 25, 2004
    Applicant: Cambridge Display Technology Ltd.
    Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
  • Publication number: 20030207152
    Abstract: The invention is directed to oxidized charge transport materials having hole transport capability in organic light emitting device (OLEDs). A charge transport compound including more than two triarylamine groups, or including at least one triarylamine group and at least one fluorene group, is partly complexed with an oxidant, such as a Lewis acid, preferably present in an amount between 0.2 and 20 percent by weight. The resulting charge transport materials exhibit good hole transport characteristics and film forming properties.
    Type: Application
    Filed: April 18, 2002
    Publication date: November 6, 2003
    Applicant: Canon Kabushiki Kaisha
    Inventors: Bing R. Hsieh, Xiao-Chang Li, Alan Sellinger
  • Patent number: 6626566
    Abstract: The present invention provides a compound or complex comprising at least two moieties, each moiety being comprised of two or more thiophenes fused directly to each other. Also provided is a method for the production of the compounds of the present invention, which method comprises the coupling of one fused thiophene derivative to another fused thiophene derivative.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: September 30, 2003
    Assignee: Cambridge Display Technology Limited
    Inventors: Andrew Bruce Holmes, Stephen Carl Moratti, Xiao-Chang Li, Henning Sirringhaus, Arno Kraft, Michael Mark Murray
  • Publication number: 20030166810
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Application
    Filed: December 6, 2002
    Publication date: September 4, 2003
    Applicant: Cambridge Display Technology Ltd.
    Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
  • Publication number: 20030088112
    Abstract: The present invention provides a compound or complex comprising at least two moieties, each moiety being comprised of two or more thiophenes fused directly to each other. Also provided is a method for the production of the compounds of the present invention, which method comprises the coupling of one fused thiophene derivative to another fused thiophene derivative.
    Type: Application
    Filed: May 24, 2002
    Publication date: May 8, 2003
    Applicant: Cambridge Display Techonology Limited
    Inventors: Andrew Bruce Holmes, Stephen Carl Moratti, Xiao-Chang Li, Henning Sirringhaus, Arno Kraft, Michael Mark Murray
  • Patent number: 6559256
    Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: May 6, 2003
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend