Patents Assigned to Cambridge Display Technology
  • Electroluminescent devices
    Patent number: 7227180
    Abstract: An electroluminescent device comprising: a first charge carrier injecting layer for injecting positive charge carriers; a second charge carrier injecting layer for injecting negative charge carriers; and a light-emissive layer located between the charge carrier injecting layers and comprising a mixture of: a first component for accepting positive charge carriers from the first charge carrier injecting layer; a second component for accepting negative charge carriers from the second charge carrier injecting layer; and a third, organic light-emissive component for generating light as a result of combination of charge carriers from the first and second components; at least one of the first, second and third components forming a type II semiconductor interface with another of the first, second and third components.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: June 5, 2007
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Jeremy Henley Burroughes, Richard Henry Friend, Christopher John Bright, David John Lacey, Peter Devine
  • Optical device
    Publication number: 20070120122
    Abstract: An optical device comprising an anode, a cathode, an organic semiconducting material between the anode and the cathode, and an electron transport layer between the cathode and the organic semiconducting material wherein the organic semiconducting material comprises sulfur and the electron transport layer containing barium.
    Type: Application
    Filed: November 28, 2006
    Publication date: May 31, 2007
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventor: Salvatore Cina
  • Pwm driver for a passive matrix display and corresponding method
    Publication number: 20070046611
    Abstract: This invention generally relates to apparatus and methods for driving passive, electro-optic displays with greater efficiency. The invention is particularly suitable for driving passive matrix organic light emitting diode displays.
    Type: Application
    Filed: March 30, 2004
    Publication date: March 1, 2007
    Applicant: Cambridge Display Technology Limited
    Inventors: Paul Routley, Euan Smith
  • (Partially) conjugated polymer, process for its preparation and use in electroluminescent devices
    Publication number: 20070034832
    Abstract: A polymer for use in an optical device comprising one or more regions, where each region comprises (i) a first structural unit having general formula I: where m=1 or 2 and which contains at least one substituent selected from the group consisting of alkyl, alkoxy, aryl, aryloxy, heteroaryl, and heteroaryloxy groups, each of which may be further substituted; and (ii) a second structural unit Ar selected from the group consisting of heteroaryl, triarylamine and 2,7-fluorenyl; such that where m=1 each region comprises a unit having general formula II: wherein, the substituent has a molecular weight of less than 300.
    Type: Application
    Filed: October 24, 2006
    Publication date: February 15, 2007
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventors: Richard O'Dell, Carl Towns, Mary McKiernan
  • Electroluminescent device
    Publication number: 20070034859
    Abstract: An optical device comprising an anode, a cathode comprising barium, strontium or calcium, and a layer of organic semiconducting material between the anode and the cathode wherein a layer of hole transporting and electron blocking material is located between the anode and the layer of organic semiconducting material.
    Type: Application
    Filed: March 19, 2004
    Publication date: February 15, 2007
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventors: Brian Tierney, Ilaria Grizzi, Clare Foden, Nalin Patel, Mark Leadbeater
  • Modified Suzuki-method for polymerization of aromatic monomers
    Patent number: 7173103
    Abstract: A process for preparing high molecular weight polymers or copolymers by Suzuki coupling. The catalyst used in the process comprises a source of palladium and a source of a phosphine characterized in that at least one substituent on the phosphine is an ortho substituted aryl group. The process is suitable for the preparation of polymers for use in electronic and optoelectronic applications.
    Type: Grant
    Filed: October 21, 2002
    Date of Patent: February 6, 2007
    Assignee: Cambridge Display Technology Limited
    Inventors: Carl Towns, Paul Wallace, Ian Allen, Thomas Pounds, Lorraine Murtagh
  • Electroluminescent devices with electrode protection
    Patent number: 7151341
    Abstract: An electroluminescent device which has an anode (4) and a cathode (10) and arranged between the anode (4) and the cathode (10) a light emissive layer (8). Also included between the light emissive layer and the anode is a dielectric layer, a carbon or amorphous silicon layer, or a layer of conductive oxide such as tin oxide, vanadium oxide, molybdenum oxide and nickel oxide.
    Type: Grant
    Filed: July 10, 2003
    Date of Patent: December 19, 2006
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Karl Pichler, Carl Towns
  • Backlit displays
    Publication number: 20060268195
    Abstract: A display device comprising: a light switching unit comprising an array of pixels each operable to vary the transmission of light therethrough; and a backlight comprising a first series of regions of organic light-emissive material having a first emission color and a second series of regions of organic light-emissive material having a second emission color, each region of organic material being located so as to lie behind a plurality of pixels of the array in the viewing direction for backlighting those pixels; and at least one of the regions of organic light-emissive material being formed by a process of ink-jet deposition.
    Type: Application
    Filed: May 15, 2006
    Publication date: November 30, 2006
    Applicant: Cambridge Display Technology Ltd.
    Inventors: Stephen Heeks, Julian Carter
  • Optical device
    Patent number: 7141818
    Abstract: An optical device comprising an anode, a cathode, an organic semiconducting material between the anode and the cathode, and an electron transport layer between the cathode and the organic semiconducting material wherein the organic semiconducting material comprises sulfur and the electron transport layer containing barium.
    Type: Grant
    Filed: August 23, 2002
    Date of Patent: November 28, 2006
    Assignee: Cambridge Display Technology Limited
    Inventor: Salvatore Cina
  • Electroluminescent devices
    Publication number: 20060263917
    Abstract: An electroluminescent device comprising: a first charge carrier injecting layer for injecting positive charge carriers; a second charge carrier injecting layer for injecting negative charge carriers; and a light-emissive layer located between the charge carrier injecting layers and comprising a mixture of: a first component for accepting positive charge carriers from the first charge carrier injecting layer; a second component for accepting negative charge carriers from the second charge carrier injecting layer; and a third, organic light-emissive component for generating light as a result of combination of charge carriers from the first and second components; at least one of the first, second and third components forming a type II semiconductor interface with another of the first, second and third components.
    Type: Application
    Filed: November 7, 2005
    Publication date: November 23, 2006
    Applicant: Cambridge Display Technology Ltd.
    Inventors: Jeremy Burroughes, Richard Friend, Christopher Bright, David Lacey, Peter Devine
  • Electroluminescent devices
    Publication number: 20060246613
    Abstract: An electroluminescent device comprising: a first charge carrier injecting layer for injecting positive charge carriers; a second charge carrier injecting layer for injecting negative charge carriers; and a light-emissive layer located between the charge carrier injecting layers and comprising a mixture of: a first component for accepting positive charge carriers from the first charge carrier injecting layer; a second component for accepting negative charge carriers from the second charge carrier injecting layer; and a third, organic light-emissive component for generating light as a result of combination of charge carriers from the first and second components; at least one of the first, second and third components forming a type II semiconductor interface with another of the first, second and third components.
    Type: Application
    Filed: April 5, 2006
    Publication date: November 2, 2006
    Applicant: Cambridge Display Technology Ltd.
    Inventors: Jeremy Burroughes, Richard Friend, Christopher Bright, David Lacey, Peter Devine
  • (Partially) conjugated polymer process for its preparation and use in electroluminescent devices
    Patent number: 7125952
    Abstract: A polymer for use in an optical device comprising one or more regions, where each region comprises (i) a first structural unit having general formula I: where m=1 or 2 and which contains at least one substituent selected from the group consisting of alkyl, alkoxy, aryl, aryloxy, heteroaryl, and heteroaryloxy groups, each of which may be further substituted; and (ii) a second structural unit Ar selected from the group consisting of heteroaryl, triarylamine and 2,7-fluorenyl; such that where m=1 each region comprises a unit having general formula II: first structural unit—Ar??(II) wherein, the substituent has a molecular weight of less than 300.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: October 24, 2006
    Assignee: Cambridge Display Technology, Limited
    Inventors: Richard O'Dell, Carl Towns, Mary McKiernan
  • Polymers, their preparation and uses
    Publication number: 20060234083
    Abstract: A polymer comprising a first repeat unit of formula (I), wherein each Ar is independently selected from optionally substituted aryl or heteroaryl and the group of formula (I) is present in a molar ratio of less than or equal to 10%, and, optionally, a second, optionally substituted repeat unit having a single nitrogen atom in its backbone of formula —Ar—N(Ar)—Ar— in a molar ratio of no greater than 5%.
    Type: Application
    Filed: March 19, 2004
    Publication date: October 19, 2006
    Applicant: Cambridge Display Technology Limited
    Inventors: Brian Tierney, Ilaria Grizzi, Clare Foden, Nalin Patel, Mark Leadbeater
  • Optical device
    Publication number: 20060223208
    Abstract: The disclosure relates to a method of forming an optical device including the steps of (i) providing a substrate carrying a first electrode capable of injecting or accepting charge carriers of a first type; (ii) depositing a polyfluorene over the first electrode; and (iii) forming over the polyfluorene a second electrode capable of injecting or accepting charge carriers of a second type, wherein the polyfluorene is heated before and after forming the second electrode. The disclosure has particular application in the preparation of organic light emitting devices.
    Type: Application
    Filed: October 10, 2003
    Publication date: October 5, 2006
    Applicant: Cambridge Display Technology Limited
    Inventors: Nalinkumar Patel, Mark Leadbeater, Craig Murphy
  • Backlit displays
    Patent number: 7116308
    Abstract: A display device comprising: a light switching unit comprising an array of pixels each operable to vary the transmission of light therethrough; and a backlight comprising a first series of regions of organic light-emissive material having a first emission color and a second series of regions of organic light-emissive material having a second emission color, each region of organic material being located so as to lie behind a plurality of pixels of the array in the viewing direction for backlighting those pixels; and at least one of the regions of organic light-emissive material being formed by a process of ink-jet deposition.
    Type: Grant
    Filed: June 16, 1999
    Date of Patent: October 3, 2006
    Assignee: Cambridge Display Technology Limited
    Inventors: Stephen Karl Heeks, Julian Charles Carter
  • Polymers for use in optical devices
    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
  • Electroluminescent devices with electrode protection
    Publication number: 20060186794
    Abstract: A method of manufacturing an electroluminescent device which has an anode and a cathode and arranged between the anode and the cathode a light emissive layer, also includes an anode protection layer which protects the anode against the effects of converting a precursor polymer to a semiconductive conjugated polymer which constitutes the light emissive layer. This has been found to increase the brightness and half-life of devices.
    Type: Application
    Filed: April 14, 2006
    Publication date: August 24, 2006
    Applicant: Cambridge Display Technology, Ltd.
    Inventors: Karl Pichler, Carl Towns
  • Optoelectronic devices
    Patent number: 7091516
    Abstract: An optoelectronic device comprising a photoresponsive region located between first and second electrodes such that charge carriers can move between the photoresponsive region and the first and second electrodes, the photoresponsive region comprising: a stack of alternate first and second layers, each first layer comprising a first photoresponsive material and each second layer comprising a second photoresponsive material, the first and second photoresponsive materials having different electron affinities; wherein each pair of second layers on opposite sides of a first layer contact each other via first holes defined by said first layer between said pair of second layers, and each pair of first layers on opposite sides of a second layer contact each other via second holes defined by said second layer between said pair of first layers.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: August 15, 2006
    Assignee: Cambridge Display Technology Limited
    Inventor: Jeremy H Burroughes
  • Electroluminescent devices
    Patent number: 7078251
    Abstract: An electroluminescent device comprising: a first charge carrier injecting layer for injecting positive charge carriers; a second charge carrier injecting layer for injecting negative charge carriers; and a light-emissive layer located between the charge carrier injecting layers and comprising a mixture of: a first component for accepting positive charge carriers from the first charge carrier injecting layer; a second component for accepting negative charge carriers from the second charge carrier injecting layer; and a third, organic light-emissive component for generating light as a result of combination of charge carriers from the first and second components; at least one of the first, second and third components forming a type II semiconductor interface with another of the first, second and third components.
    Type: Grant
    Filed: October 10, 2003
    Date of Patent: July 18, 2006
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Jeremy Henley Burroughes, Richard Henry Friend, Christopher John Bright, David John Lacey, Peter Devine
  • Polymers for use in optical devices
    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