Patents Assigned to Cambridge Display Technology
  • Display driver circuits for electroluminescent displays, using constant current generators
    Patent number: 7800558
    Abstract: Display driver circuits for driving an organic light emitting diode display, particularly a passive matrix display with greater efficiency are described. The display includes at least one electroluminescent display element, and the driver includes at least one substantially constant current generator for driving the display element. The display driver control circuitry includes a drive voltage sensor for sensing a voltage on a first line in which the current is regulated by the constant current generator; and a voltage controller coupled to the drive voltage sensor for controlling the voltage of a supply for the constant current generator in response to said sensed voltage, and configured to control the supply voltage to increase the efficiency of said display driver.
    Type: Grant
    Filed: June 12, 2003
    Date of Patent: September 21, 2010
    Assignee: Cambridge Display Technology Limited
    Inventors: Paul R. Routley, Euan C. Smith
  • Optical Devices and Their Manufacture
    Publication number: 20100230659
    Abstract: A process for the preparation of a polymerizable unit for production of a hole transporting polymer for use in an optical device, which process comprises reacting in the presence of S to form wherein each R is the same or different and is independently H or a substituent group; n is O or an integer from 1 to 100; Ar and Ar? are the same or different and are each aromatic or heteroaromatic groups which are substituted or unsubstituted; Y is a direct bond, a light emissive moiety, a hole transporting moiety or an electron transporting moiety; and X is a polymerizable group.
    Type: Application
    Filed: December 23, 2005
    Publication date: September 16, 2010
    Applicant: Cambridge Display Technology
    Inventors: Carl R. Towns, Caroline Towns
  • Polymers for use in optical devices
    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
  • Method of Fabricating a Self-aligned Top-gate Organic Transistor
    Publication number: 20100227434
    Abstract: A method of fabricating a self-aligned top-gate organic transistor comprises depositing a photoresist material over the dielectric material, and exposing the photoresist material to irradiation through the substrate using the source and drain electrodes as a mask. The exposure defines a region for deposition of the gate electrode.
    Type: Application
    Filed: December 22, 2009
    Publication date: September 9, 2010
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LTD.
    Inventor: Euan Smith
  • Optoelectronic Device
    Publication number: 20100220041
    Abstract: A passive matrix display comprising an array of diodes disposed between a plurality of anode lines and a plurality of cathode lines, wherein at least some of the diodes are emissive diodes which are orientated in a forward direction relative to the cathode and anode lines and others of the diodes are sensing diodes orientated in a reverse direction relative to the cathode and anode lines.
    Type: Application
    Filed: September 26, 2008
    Publication date: September 2, 2010
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventor: Euan C. Smith
  • Organic light-emitting device and method of fabricating the same
    Patent number: 7786474
    Abstract: An organic light-emitting device, comprising: a substrate; a first conductive layer formed over the substrate; at least one layer of a light-emissive organic material formed over the first conductive layer; a barrier layer formed over the at least one organic layer which acts to protect the at least one layer of organic material; and a second conductive layer, preferably a patterned sputtered layer, formed over the barrier layer.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: August 31, 2010
    Assignee: Cambridge Display Technology Limited
    Inventor: Karl Pichler
  • Organic Thin Film Transistors, Organic Light-emissive Devices and Organic Light-emissive Displays
    Publication number: 20100203663
    Abstract: A method of manufacturing an organic thin film transistor, the method comprising: depositing a source and drain electrode; forming a thin self-assembled layer of material on the source and drain electrodes, the thin self-assembled layer of material comprising a dopant moiety for chemically doping an organic semi-conductive material by accepting or donating charge and a separate attachment moiety bonded to the dopant moiety and selectively bonded to the source and drain electrodes; and depositing a solution comprising a solvent and an organic semi-conductive material in a channel region between the source and drain electrode.
    Type: Application
    Filed: June 13, 2008
    Publication date: August 12, 2010
    Applicants: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED, PANASONIC CORPORATION
    Inventors: Sadayoshi Hotta, Jonathan Halls, Gregory Whiting
  • Light Emissive Device
    Publication number: 20100167440
    Abstract: An organic light emissive device including a cathode; an anode; and an organic light emissive region between the cathode and the anode, wherein the cathode includes a transparent bilayer comprising a layer of a low work function metal having a work function of no more than 3.5 eV and a transparent layer of silver.
    Type: Application
    Filed: March 10, 2010
    Publication date: July 1, 2010
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventor: Matthew Roberts
  • Combined information display and information input device
    Patent number: 7745817
    Abstract: A combined information display and information input device comprising a matrix of independently addressable light emitting devices and a plurality of light sensing devices, the light emitting devices comprising organic light emitting diodes comprising organic light emitting material positioned between a low work function electrode and a high work function electrode characterized in that the light sensing devices comprise organic photovoltaic devices comprising at least an organic electron donor and at least an organic electron acceptor positioned between a high work function electrode and a low work function electrode. The combined information display and information input device has application as a touch screen, for example for a mobile communication device.
    Type: Grant
    Filed: June 26, 2003
    Date of Patent: June 29, 2010
    Assignee: Cambridge Display Technology Limited
    Inventors: Jonathan Halls, Matthew Shade
  • Light-Emissive Device and Method of Manufacture
    Publication number: 20100155667
    Abstract: A light-emissive device is prepared by depositing a polymer layer on a substrate. The deposition process utilizes a formulation comprising a conjugated polymer dissolved in a solvent, the solvent including a trialkyl-substituted aromatic hydrocarbon wherein at least two of the alkyl substituents are ortho to one another. The deposition of the polymer layer on the substrate may be accomplished by an ink-jet method.
    Type: Application
    Filed: February 10, 2010
    Publication date: June 24, 2010
    Applicant: Cambridge Display Technology Limited
    Inventors: Ilaria Lavinia Grizzi, Peter Lyon
  • PWM driver for a passive matrix display and corresponding method
    Patent number: 7738001
    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: Grant
    Filed: March 30, 2004
    Date of Patent: June 15, 2010
    Assignee: Cambridge Display Technology Limited
    Inventors: Paul R. Routley, Euan C. Smith
  • Active Matrix Optical Device
    Publication number: 20100102300
    Abstract: An active matrix organic optical device comprising a plurality of organic thin film transistors and a plurality of pixels disposed on a common substrate, wherein a common bank layer is provided for the organic thin film transistors and the pixels, the common bank layer defining a plurality of wells, wherein some of the wells contain the organic semiconducting material of the organic thin film transistors therein and others of the wells contain organic optically active material of the pixels therein.
    Type: Application
    Filed: April 3, 2008
    Publication date: April 29, 2010
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventors: Jeremy Henley Burroughes, Mark Bale, Mark Garbett, Jonathan J. Halls
  • Method for Fabricating a Polymer L.E.D.
    Publication number: 20100099210
    Abstract: A light-emissive device is prepared by depositing a polymer layer on a substrate. The deposition process utilizes a formulation comprising a conjugated polymer dissolved in a solvent, the solvent including a trialkyl-substituted aromatic hydrocarbon wherein at least two of the alkyl substituents are ortho to one another. The deposition of the polymer layer on the substrate may be accomplished by an ink-jet method.
    Type: Application
    Filed: December 28, 2009
    Publication date: April 22, 2010
    Applicant: Cambridge Display Technology Limited
    Inventors: Ilaria Lavinia Grzzi, Peter Lyon
  • Polymers their preparation and uses
    Patent number: 7696303
    Abstract: A polymer for use in an optical device comprising a first, optionally substituted, repeat unit of formula and a second, optionally substituted, repeat unit of formula wherein each Ar and Ar? is the same or different and comprises an optionally substituted aryl or heteroaryl group and optionally a third, optionally substituted, repeat unit in a molar ratio of no greater than 5%, the third repeat unit having a formula —Ar—N(Ar)—Ar— and having a single nitrogen atom in its backbone.
    Type: Grant
    Filed: May 9, 2003
    Date of Patent: April 13, 2010
    Assignee: Cambridge Display Technology Limited
    Inventors: Richard O'Dell, Carl Towns, Brian Tierney, Stephen O'Connor, Ilaria Grizzi, Clare L. Foden, Nalinkumar Patel, Mark L. Leadbeater, Lorraine Murtagh
  • Thin Film Transistor
    Publication number: 20100084638
    Abstract: A method of making a top-gate organic thin film transistor, comprising forming source and drain contacts on a substrate; oxidizing portions of the source and drain contacts; depositing an organic semiconductor layer to form a bridge between the oxidized portions of the source and drain contacts; depositing a gate insulating layer over the organic semiconductor layer; and forming a gate electrode over the gate insulating layer.
    Type: Application
    Filed: April 3, 2008
    Publication date: April 8, 2010
    Applicants: Cambridge Display Technology Limited, Panasonic Corporation
    Inventors: Sadayoshi Hotta, Jeremy Henley Burroughes, Gregory Lewis Whiting
  • Method for fabricating a polymer L.E.D.
    Patent number: 7687287
    Abstract: A light-emissive device is prepared by depositing a polymer layer on a substrate. The deposition process utilizes a formulation comprising a conjugated polymer dissolved in a solvent, the solvent including a trialkyl-substituted aromatic hydrocarbon wherein at least two of the alkyl substituents are ortho to one another. The deposition of the polymer layer on the substrate may be accomplished by an ink-jet method.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: March 30, 2010
    Assignee: Cambridge Display Technology Limited
    Inventors: Ilaria Lavinia Grzzi, Peter Lyon
  • Conductive Polymer Compositions in Opto-Electrical Devices
    Publication number: 20100059738
    Abstract: A conductive polymer composition comprising: a polymer having a HOMO level greater than or equal to ?5.7 eV and a dopant having a LUMO level less than ?4.3 eV.
    Type: Application
    Filed: September 7, 2007
    Publication date: March 11, 2010
    Applicants: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED, CAMBRIDGE UNIVERSITY TECHNICAL SERVICES LIMITED
    Inventors: Jeremy Burroughes, Keng Hoong Yim, Ji-Seon Kim
  • Luminescent polymer
    Patent number: 7674530
    Abstract: A soluble luminescent polymer comprising a first repeat unit [Ar1] and a second repeat unit comprising a unit of general formula (I) which is substituted or unsubstituted: wherein X is RC?CR, S, O or NR; Ar1, Ar2 and Ar3 are each independently an aromatic or heteroaromatic group; and each R independently is hydrogen or a substituent group.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: March 9, 2010
    Assignee: Cambridge Display Technology Limited
    Inventors: Carl Towns, Richard O'Dell, Andrea Lux
  • Organic Thin Film Transistors
    Publication number: 20100051922
    Abstract: An organic thin film transistor comprising: a substrate; a source electrode and a drain electrode defining a channel; a layer of insulating material disposed over the source and drain electrodes; a layer of organic semi-conductive material extending across the channel; a layer of dielectric material; and a gate electrode disposed over the layer of dielectric material.
    Type: Application
    Filed: April 3, 2008
    Publication date: March 4, 2010
    Applicants: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED, Panasonic Corporation
    Inventors: Sadayoshi Hotta, Jeremy Henley Burroughes, Gregory Lewis Whiting
  • Organic Thin Film Transistors
    Publication number: 20100032662
    Abstract: A method of forming an organic thin film transistor comprising: providing a structure comprising source and drain electrodes with a channel region therebetween, a gate electrode, and a dielectric layer disposed between the source and drain electrodes and the gate electrode; and patterning the dielectric layer using the source and drain electrodes as a mask to form a region of dielectric material in the channel region which is thinner than regions of dielectric material adjacent the channel region.
    Type: Application
    Filed: April 3, 2008
    Publication date: February 11, 2010
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LTD.
    Inventors: Gregory Whiting, Jonathan J. Halls