Patents Assigned to Cambridge Display Technology
  • POLYMER AND ORGANIC LIGHT-EMITTING DEVICE
    Publication number: 20130292657
    Abstract: Light-emitting composition and devices including the same, the composition including a fluorescent light-emitting material and a polymer having a conjugating repeat unit and a non-conjugating repeat unit in a backbone of the polymer, and in which the conjugating repeat unit provides at least one conjugation path between repeat units linked to it; the non-conjugating repeat unit reduces conjugation of the polymer as compared to a polymer in which the non-conjugating repeat unit is absent; and a triplet excited state energy level of the light-emitting material is higher than a triplet excited state energy level of the non-conjugating repeat unit.
    Type: Application
    Filed: October 13, 2011
    Publication date: November 7, 2013
    Applicants: Sumitomo Chemical Company Limited, Cambridge Display Technology, Ltd.
    Inventors: Natasha M.J. Conway, Jonathan Pillow, Thomas Pounds, Fredrik Jakobsson, Christian Nielsen
  • SEMICONDUCTOR BLEND
    Publication number: 20130284984
    Abstract: The invention provides an ink comprising a blend of a polymer material and a small molecule semiconductor material dissolved or dispersed in a solvent, said blend comprising at least 70% by weight of said polymer material and wherein the ink concentration is at least 0.4% w/v. The polymer material is preferably TFB [9,9?-dioctylfluorene-co-N-(4-butylphenyl)-diphenylamine]n, and said small molecule semiconductor material preferably has the following formula: wherein X11 is a group of formula CnH2n+1 wherein n is an integer of from 4 to 16.
    Type: Application
    Filed: December 15, 2011
    Publication date: October 31, 2013
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventors: Christopher Newsome, Richard Wilson
  • Polar semiconductor hole transporting material
    Patent number: 8569752
    Abstract: A semiconductive hole transport material containing polar substituent groups, the polar substituent groups substantially not affecting the electronic properties of the hole transport material and the hole transport material being soluble in a polar solvent.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: October 29, 2013
    Assignees: Cambridge Display Technology Limited, CDT Oxford Limited
    Inventors: Mary J. McKiernan, Annette Steudel, Caroline Towns
  • Image processing systems
    Patent number: 8564505
    Abstract: This invention generally relates to image processing systems. More particularly it relates to systems and methods for displaying images using multi-line addressing (MLA) or total matrix addressing (TMA) techniques, and to techniques for post-processing of data for display generated by these techniques. Embodiments of the invention are particularly useful for driving OLED (organic light emitting diode) displays. We describe a method of driving an electroluminescent display to display an image using a plurality of temporal sub-frames, data for a said sub-frame comprising a first set of drive values (R;C) and second set of drive values (C;R) for driving respective first and second axes of said display, a said sub-frame having an associated sub-frame display time.
    Type: Grant
    Filed: March 21, 2007
    Date of Patent: October 22, 2013
    Assignee: Cambridge Display Technology Limited
    Inventor: Euan Christopher Smith
  • POLYMER AND ORGANIC LIGHT-EMITTING DEVICE
    Publication number: 20130270535
    Abstract: An organic light-emitting device comprises an anode, a cathode, a light-emitting layer between the anode and the cathode and a hole transporting layer between the anode and the light-emitting layer. The hole transporting layer comprises a hole-transporting material having a triplet energy level, and a triplet-quenching unit having a triplet energy level that is lower than the triplet energy level of the hole-transporting material. The triplet quenching unit is selected from the group consisting of polyaromatic hydrocarbons such as 2,6-anthracenes, 9,10-anthracenes and derivatives thereof; anthanthrenes and derivatives thereof; distyryl aryls and derivatives thereof such as distyrylbenzenes, distyrylbiphenyls, stilbenes, fulvenes, dibenzofulvenes, perylenes, linear polyenes (from 2 to 6 alkenes) and cyclic polyenes, each of which may optionally be substituted with one or more substituents.
    Type: Application
    Filed: October 18, 2011
    Publication date: October 17, 2013
    Applicants: SUMITOMO CHEMICAL COMPANY LIMITED, CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventors: Jonathan Pillow, Martin Humphries, Simon King
  • Hole Injection Layers
    Publication number: 20130264559
    Abstract: The present invention provides a process for the preparation of a device comprising a transition metal oxide doped interface between an anode and a semiconducting hole transport layer, comprising the steps of depositing a solution comprising a precursor for a metal oxide layer on said anode, drying and optionally annealing the deposited solution to form a solid layer precursor, depositing a solution of said semiconducting hole transport layer material onto the solid layer, and optionally annealing thermally the resulting product to give the desired device having transition metal oxide at the interface between said anode and said semiconducting hole transport layer; together with a device obtainable by the process according to the invention.
    Type: Application
    Filed: December 1, 2011
    Publication date: October 10, 2013
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventors: Thomas Kugler, Richard Wilson
  • Method of fabricating a self-aligned top-gate organic transistor
    Patent number: 8546179
    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: Grant
    Filed: December 22, 2009
    Date of Patent: October 1, 2013
    Assignee: Cambridge Display Technology Ltd.
    Inventor: Euan Smith
  • SEMICONDUCTOR APPLICATION METHOD AND PRODUCT
    Publication number: 20130248829
    Abstract: A system and method for driving pixels of an OLED display using a backplane for an active matrix device comprising a substrate arranged to electrically connect to a plurality of semiconductor elements, a plurality of first semiconductor elements mounted on the substrate, each comprising one or more circuit elements configured to drive one or more active elements of the active matrix device, and a plurality of second semiconductor elements mounted on the substrate, each comprising one or more circuit elements configured to control one or more of the first semiconductor elements.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 26, 2013
    Applicant: Cambridge Display Technology Limited
    Inventor: Euan Smith
  • WHITE LIGHT EMITTING MATERIAL
    Publication number: 20130237680
    Abstract: A white light emitting material comprising a polymer having an emitting polymer chain and at least one emitting end capping group.
    Type: Application
    Filed: March 18, 2013
    Publication date: September 12, 2013
    Applicants: Sumitomo Chemical Co., Ltd., Cambridge Display Technology Limited
    Inventors: Richard Wilson, Thomas Pounds, Natasha M. Conway, Ilaria Grizzi, Antonio Guerrero Castillejo
  • Backlit displays including organic light-emissive material
    Patent number: 8529309
    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 18, 2012
    Date of Patent: September 10, 2013
    Assignee: Cambridge Display Technology Limited
    Inventors: Stephen Karl Heeks, Julian Charles Carter
  • RIGID AMINES
    Publication number: 20130220422
    Abstract: A monomer for use in manufacturing a conjugated polymer, the monomer having a structure as shown formula (2): Ar1, Ar2 and Ar3 are independently selected from optionally substituted aryl or heteroaryl, X1 and X3 both independently comprise a leaving group capable of participating in polymerisation and Z represents a direct bond or an optionally substituted bridging atom.
    Type: Application
    Filed: March 18, 2013
    Publication date: August 29, 2013
    Applicants: CDT OXFORD LIMITED, CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventors: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED, CDT OXFORD LIMITED
  • ORGANIC ELECTROLUMINESCENT DEVICE
    Publication number: 20130207086
    Abstract: A light emitting device includes an organic electroluminescent material having a glass transition temperature substantially at or below an intended normal operation temperature of the device. A method for regenerating an organic light emitting device by heating an electroluminescent layer to a temperature substantially equal to or above its glass transition temperature is also described. This provides a means and method for regenerating a degraded emitter in use.
    Type: Application
    Filed: June 16, 2011
    Publication date: August 15, 2013
    Applicant: Cambridge Display Technology Limited
    Inventors: Matthew Roberts, Andrew Lee
  • ELECTROLUMINESCENT DEVICE
    Publication number: 20130200352
    Abstract: An electroluminescent device (20) having a first layer comprising a fluorinated first organic compound with one or more fluorene residues and soluble in a fluorinated solvent, the first layer being adjacent to a second layer having second organic compound that is insoluble in a fluorinated solvent, and methods and materials for making said device.
    Type: Application
    Filed: September 2, 2011
    Publication date: August 8, 2013
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY, LTD.
    Inventor: Jonathan Pillow
  • Blue-shifted triarylamine polymer
    Patent number: 8502199
    Abstract: A semiconductive conjugated polymer comprising a first repeat unit comprising general formula I: where Ar1, Ar3, and Ar5 are the same or different and wherein each represents an optionally substituted aryl or heteroaryl group; Ar2 and Ar4 are the same or different and each represent a substituted aryl or heteroaryl group; and Ar2 and Ar4 sterically interact with one another so as to cause an increase in the bandgap of the polymer.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: August 6, 2013
    Assignees: Cambridge Display Technology Limited, CDT Oxford Limited
    Inventors: Brian Tierney, Mark Leadbeater, Nalinkumar Patel, Clare L. Foden, Natasha M. Conway, Mary J. McKiernan
  • Organic thin film transistors
    Patent number: 8502356
    Abstract: A method of forming an organic thin film transistor comprising source and drain electrodes with a channel region therebetween, a gate electrode, a dielectric layer disposed between the source and drain electrodes and the gate electrode, and an organic semiconductor disposed in at least the channel region between the source and drain electrodes, said method comprising: seeding a surface in the channel region with crystallization sites prior to deposition of the organic semiconductor; and depositing the organic semiconductor onto the seeded surface whereby the organic semiconductor crystallizes at the crystallization sites forming crystalline domains in the channel region.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: August 6, 2013
    Assignees: Cambridge Display Technology Limited, Panasonic Corporation
    Inventors: Jonathan J. Halls, Craig Edward Murphy, Gregory Whiting, Sadayoshi Hotta
  • "Lighting Elements"
    Publication number: 20130193425
    Abstract: An OLED lighting element comprises a substrate bearing an OLED structure extending laterally over said substrate and sandwiched between first and second electrode layers. The first electrode layer defines a plurality of electrically conductive tracks and said second electrode layer comprises a substantially continuous electrically conducting layer. The OLED lighting element has an electrical bus-bar connected to said electrically conductive tracks extending substantially completely along the or each lateral edge of said lighting element. The electrically conductive tracks run in a radial direction from a laterally central location within said lighting element towards said bus-bar along said lateral edges of said lighting element. A said track subdivides into a plurality of tracks with increasing distance from said central location. This arrangement makes more efficient use of the conductive tracks.
    Type: Application
    Filed: July 4, 2011
    Publication date: August 1, 2013
    Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LTD.
    Inventor: Euan C. Smith
  • ORGANIC LIGHT-EMITTING DEVICE AND METHOD
    Publication number: 20130187146
    Abstract: Composition which may be useful in an organic light emitting diode, the composition having a fluorescent light-emitting polymer with light-emitting repeat units, and a triplet-accepting unit bound to the light-emitting polymer.
    Type: Application
    Filed: June 24, 2011
    Publication date: July 25, 2013
    Applicants: SUMITOMO CHEMICAL COMPANY LIMITED, CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventors: Jonathan Pillow, Matthew Roberts, Martina Pintani, Simon King, MIchael Cass
  • ORGANIC LIGHT-EMITTING COMPOSITION COMPRISING ANTHRANTHENE DERIVATES AND DEVICE AND METHOD USING THE SAME
    Publication number: 20130187145
    Abstract: Composition comprising a fluorescent light-emitting material and a triplet-accepting unit comprising an optionally substituted compound of formula (I): The composition may be used in an organic light-emitting device; the optionally substituted compound of formula (I) may be blended with or attached to the fluorescent light emitting material; and the composition may be deposited by solution deposition.
    Type: Application
    Filed: June 24, 2011
    Publication date: July 25, 2013
    Applicants: SUMITOMO CHEMICAL COMPANY LIMITED, CAMBRIDGE DISPLAY TECHNOLOGY LIMITED
    Inventors: Ruth Pegington, Martina Pintani, Jonathan Pillow
  • ORGANIC LIGHT-EMITTING DEVICE AND METHOD
    Publication number: 20130187147
    Abstract: Composition for use in an organic light-emitting device, the composition having a fluorescent light-emitting material and a triplet-accepting material subject to the following energetic scheme: 2×T1A>S1A>S1E, or T1A+T1E>S1A>S1E in which: T1A represents a triplet excited state energy level of the triplet-accepting material; TIE represents a triplet excited state energy level of the light-emitting material; S1A represents a singlet excited state energy level of the triplet-accepting material; and S1E represents a singlet excited state energy level of the light-emitting material; and in which light emitted by the composition upon excitation includes delayed fluorescence.
    Type: Application
    Filed: June 24, 2011
    Publication date: July 25, 2013
    Applicants: Sumitomo Chemical Company Limited, Cambridge Display Technology Limited
    Inventors: Simon King, Martina Pintani, Matthew Roberts, Michael Cass
  • Current drive display system
    Patent number: 8493293
    Abstract: This invention relates to systems, methods and apparatus for driving organic light emitting diodes (OLED) displays, in particular those using multi-line addressing (MLA) techniques. Embodiments of the invention are particularly suitable for use with so-called passive matrix OLED displays. A current drive system for an electroluminescent display, the system comprising: a plurality of current mirrors having a plurality of outputs for driving a plurality of drive electrodes of said display, each said current mirror having a reference signal input; and an automatic selector coupled to said current mirror outputs to automatically select a said output for providing reference signal inputs to said current mirrors.
    Type: Grant
    Filed: March 6, 2007
    Date of Patent: July 23, 2013
    Assignees: Cambridge Display Technology Limited, STMicroelectronics S.A.
    Inventors: Paul Richard Routley, Olivier Le-Briz