Patents Assigned to Cambridge Display Technology
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Patent number: 9487878Abstract: We describe a lighting tile having a substrate bearing an electrode structure, the electrode structure comprising: a plurality of electrically conductive tracks disposed over said substrate; and an electrical connection region connecting to said plurality of tracks; wherein the height of said tracks tapers away from said connection region to compensate for a reduction in luminance from said lighting tile array from the electrical connection region which arises from a non-uniform voltage drop which appears along the tracks in use. Advantageously the tracks are fabricated by electroplating: then, as the rate of deposition is determined by the voltage drop along a track during plating, the height of the deposited tracks, and therefore their resistance, will match the profile required in operation to compensate for the reduction in luminance which would otherwise occur.Type: GrantFiled: August 21, 2015Date of Patent: November 8, 2016Assignee: CAMBRIDGE DISPLAY TECHNOLOGY LIMITEDInventors: Colin Baker, Aleksandra Rankov
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Publication number: 20160315265Abstract: A polymer comprises repeat units of formula (I): wherein: R1 independently in each occurrence is a substituent, and two substituents R1 may be linked to form a ring; R2 in each occurrence independently is H or a substituent, and two substituents R2 may be linked to form a ring; R3 independently in each occurrence is a substituent; Ar1 independently in each occurrence is an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents; x is 0, 1 or 2; y is 0, 1 or 2; and z independently in each occurrence is 0, 1 or 2. Such repeat units have a relatively deep LUMO level that may reduce the barrier to transport of electrons from the electron-transporting layer to the light-emitting layer of an organic light emitting diode having an active layer comprising such a polymer.Type: ApplicationFiled: November 25, 2014Publication date: October 27, 2016Applicant: CAMBRIDGE DISPLAY TECHNOLOGY LIMITEDInventors: Jeremy Burroughes, Tania Zuberi, Rajesh Kumar Janarthanan, Kandasamy Shanmugasundaram
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Patent number: 9461262Abstract: This invention generally relates to an optoelectronic device and a method of fabricating such a device, and more particularly to an optoelectronic device comprising an anode layer, a semiconductive layer provided over the anode layer, and a cathode layer provided over the semiconductive layer, the anode layer comprising a plurality of electrically conductive tracks connected together and spaced apart from one another with gaps therebetween, the device further comprising a first and one or more further hole injection layers provided between the anode layer and the semiconductive layer and extending across said gaps, wherein the first hole injection layer has a conductivity greater than the conductivity of the one or more further hole injection layers.Type: GrantFiled: March 13, 2013Date of Patent: October 4, 2016Assignee: CAMBRIDGE DISPLAY TECHNOLOGY LIMITEDInventors: Surama Malik, Julian Carter, Laurence Scullion, Colin Baker, Arne Fleissner, Jeremy Burroughes
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Publication number: 20160260914Abstract: A compound of formula (I) wherein M is a transition metal; L is a ligand; x is at least 1; y is 0 or a positive integer; R1 in each occurrence is independently a substituent; R2 and R3 in each occurrence is independently H or a substituent, with the proviso that at least one of R1, R2 and R3 is a group X comprising at least one aryl or heteroaryl group. The compound of formula (I) may be used as a phosphorescent material in an organic light-emitting device.Type: ApplicationFiled: March 3, 2016Publication date: September 8, 2016Applicants: Cambridge Display Technology Limited, Sumitomo Chemical Company LimitedInventors: Kiran Kamtekar, William Tarran, Tania Zuberi
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Publication number: 20160240785Abstract: A polymer comprising a fluorescent light-emitting repeating unit comprising a group of formula ED-EA wherein ED is an electron-donating unit; EA is an electron-accepting unit; and a band gap EgCT of a charge-transfer state formed from the electron-donating unit and the electron-accepting unit is smaller than the bandgap of either the electron-accepting unit EgEA or that of the electron-donating unit EgED.Type: ApplicationFiled: February 17, 2016Publication date: August 18, 2016Applicants: Cambridge Display Technology Limited, Sumitomo Chemical Company LimitedInventors: Michael Cass, Matthew Roberts, Florence Bourcet, Andrey Nikolaenko
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Patent number: 9419233Abstract: A polymer containing an optionally substituted repeat unit of formula (I) wherein each R is the same or different and represents H or an electron withdrawing group, and each R1 is the same or different and represents a substituent.Type: GrantFiled: May 7, 2013Date of Patent: August 16, 2016Assignees: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED, CAMBRIDGE ENTERPRISE LIMITEDInventors: Carl R. Towns, Chris Mak, Khai Leok Chan, Andrew Bruce Holmes
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Publication number: 20160233438Abstract: Provided is a solution comprising a polymer and an organic semiconductor compound, wherein the semiconductor compound is a thiophene derivative, and wherein the solvent is a mixture comprising a) at least one of 4-methyl anisole, indane and an alkylbenzene with a linear or branched alkyl group containing from 4 to 7 carbon atoms; and b) at least one of tetrahydronaphthalin and 1,2,4-trimethylbenzene.Type: ApplicationFiled: February 3, 2016Publication date: August 11, 2016Applicant: Cambridge Display Technology LimitedInventors: Christopher Newsome, Daniel Tobjork
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Publication number: 20160218291Abstract: Polymer and Organic Light Emitting Device A polymer comprising a repeat unit of formula (I a), (I b) or (Ic): (Formulae (Ia), (Ib), (Ic)) wherein M is a metal; R is a backbone repeat group; n is 1 or 2; Sp is a spacer group; w is 0 or 1; L1 and L2 are mono- or bidentate co-coordinating groups; ---- represents a second metal to ligand bond in the case where L1 or L2 is a bidentate ligand and at least one of L1 and L2 is substituted with group of formula (II) (Formula (II)) wherein m is 0 or 1; each Ar1, Ar2 and Ar3 is aryl or heteroaryl. The polymer may be used as an emissive material in an organic light-emitting device.Type: ApplicationFiled: September 23, 2014Publication date: July 28, 2016Applicants: Cambridge Display Technology Limited, Sumitomo Chemical Company LimitedInventors: Martin Humphries, Simon Foxon
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Publication number: 20160211477Abstract: A method of forming a light-emitting device comprises: forming patterned portions of precursor material over a substrate, the edges of the patterned portions defining sidewalls; performing a shaping control process on the patterned portions of precursor material to control the sidewall profile to reduce the angle the sidewalls of the precursor material make with the substrate to less than 15 degrees; selectively applying from solution a conductive coating onto the portions of shaped precursor material so as to form a plurality of first conducting contacts such that an upper surface of said conductive coating follows the sidewall profile of the precursor material; forming a light-emitting layer over the conductive contacts and substrate, and forming a plurality of second conducting contacts over the light-emitting layer. The precursor material may comprises an activator catalyst and the conductive coating comprises a metal selectively applied to the shaped precursor material by electroless plating.Type: ApplicationFiled: January 12, 2016Publication date: July 21, 2016Applicant: Cambridge Display Technology, Ltd.Inventors: Surama Malik, Colin Baker, Laurence Scullion
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Patent number: 9390921Abstract: An ammonium thio-transition metal complex is used as an adhesion promoter for immobilizing temperature-stable transition metal oxide layers on an inert metal surface. The ammonium thio-transition metal complex comprises a transition metal selected from molybdenum, tungsten and vanadium, and is preferably ammonium tetrathiomolybdate. A precursor of the transition metal oxide is deposited on the inert metal surface by a solution-based process. The precursor is a dispersion or a dissolution of the transition metal oxide, a transition metal oxide hydrate, an ammonium salt of an acidic transition metal oxide hydrate or phosphoric acid-transition metal oxide complex in water or a phosphoric acid-transition metal oxide complex dissolved in a polar organic solvent.Type: GrantFiled: December 1, 2011Date of Patent: July 12, 2016Assignee: CAMBRIDGE DISPLAY TECHNOLOGY LIMITEDInventor: Thomas Kugler
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Publication number: 20160190459Abstract: A method of fractionating a semiconducting polymer wherein the semiconducting polymer comprises polymer chains comprising a defect group, the method comprising the steps of reacting the polymer chains comprising a defect group to form polymer chains comprising separating groups; and separating the polymer chains comprising the separating groups from the semiconducting polymer. The separating group may be a binding group X capable of binding to a solid substrate material 305, for example particulate silica.Type: ApplicationFiled: December 14, 2015Publication date: June 30, 2016Applicants: Cambridge Display Technology Limited, Sumitomo Chemical Company LimitedInventor: Jonathan Pillow
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Publication number: 20160190458Abstract: A polymer comprising a repeat unit of formula (I): wherein R1 in each occurrence is independently H or a substituent, and the two groups R1 may be linked to form a ring; R2 in each occurrence is independently a substituent; Ar1 in each occurrence is independently an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents; R3 in each occurrence is independently a substituent; each n independently is 0, 1, 2 or 3 with the proviso that at least one n=1; and each m is independently 0 or 1. The polymer may be a light-emitting 103 of an organic light-emitting device.Type: ApplicationFiled: July 29, 2014Publication date: June 30, 2016Applicants: Cambridge Display Technology Limited, Sumitomo Chemical Company LimitedInventors: Sophie Barbara Heidenhain, Richard Owoare, Gary Watts, Jonathan Pillow
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Publication number: 20160190507Abstract: A layered structure for an organic electronic device comprising: •(i) a substrate; •(ii) an electrode deposited on said substrate; and •(iii) a hole injection layer (HIL) deposited on said electrode, wherein said electrode comprises a metal grid and an organic charge transporting polymer layer (CTL) which, together with said substrate, encapsulates said metal grid and protects it from being attacked by acidic species in the hole injection layer.Type: ApplicationFiled: August 13, 2014Publication date: June 30, 2016Applicant: Cambridge Display Technology LimitedInventors: Alexander Doust, Natasha M. J. Conway, Colin Baker
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Patent number: 9373795Abstract: An organic semiconductor composition including at least one solvent, a polymer, a first small molecule organic semiconductor and a small molecule crystallization modifier. The first small molecule organic semiconductor:small molecule crystallization modifier weight ratio is at least 6:1, optionally at least 10:1, optionally at least 20:1. The small molecule crystallization modifier increases the uniformity of the first small molecule organic semiconductor distribution in an organic semiconductor layer deposited in the channel of an organic transistor, with the effect that the mobility of the organic transistor is higher than the mobility of an organic device including a composition without the small molecule crystallization modifier.Type: GrantFiled: September 12, 2012Date of Patent: June 21, 2016Assignee: Cambridge Display Technology LimitedInventors: Jeremy Burroughes, Christopher Newsome
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Patent number: 9373554Abstract: A method of monitoring an OLED production process for making an OLED device is disclosed. According to the method, at least one reference OLED device similar to said OLED device is fabricated. Said at least one reference OLED device has a layered structure corresponding to said OLED device and a range of hole injection and/or transport layer thicknesses. A spectral variation of a light output of said at least one reference OLED device with respect to variation in said hole injection and/or transport layer thickness is characterized. A said OLED device is partially fabricated by depositing one or more layers comprising at least said hole injection and/or transport layer and a thickness of said one or more layers is measured such that a light output for said partially fabricated OLED device can be predicted, in a target color space, from said measuring, using said characterized spectral variation.Type: GrantFiled: June 25, 2014Date of Patent: June 21, 2016Assignee: CAMBRIDGE DISPLAY TECHNOLOGY LIMITEDInventors: Graham Anderson, Michael Cass, Daniel Forsythe
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Patent number: 9353130Abstract: A non-carcinogenic process for the activation of zinc metal in a medium polarity solvent, wherein said zinc metal is activated by the reaction thereof with a halogen and a lithium compound selected from lithium halides and lithium pseudohalides, the use of said activated zinc metal for the preparation of an organozinc halide of formula R—ZnX, and a process for the preparation of compounds obtainable by the reaction of said organozinc halide of formula R—ZnX with compounds having functionality enabling them to react with said organozinc halide.Type: GrantFiled: January 30, 2013Date of Patent: May 31, 2016Assignees: CAMBRIDGE DISPLAY TECHNOLOGY LIMITED, SUMITOMO CHEMICAL COMPANY LIMITEDInventors: Jonathan Pillow, James Morey
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Publication number: 20160149147Abstract: There is disclosed a method for preparing a modified electrode for an organic electronic device, wherein said modified electrode comprises a surface modification layer, comprising: (i) depositing a solution comprising M(tfd)3, wherein M is Mo, Cr or W, and at least one solvent onto at least a part of at least one surface of said electrode; and (ii) removing at least some of said solvent to form said surface modification layer on said electrode.Type: ApplicationFiled: July 11, 2014Publication date: May 26, 2016Applicant: Cambridge Display Technology LimitedInventor: Christopher Newsome
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Patent number: 9337426Abstract: A method of fabricating an organic electronic device using ink jet printing in swathes, comprises depositing an ink into a first set of locations in a column in a first print pass; wherein the first set of locations is less than a total number of locations in the column; and depositing an ink into a second set of locations in the column in a subsequent print pass; wherein the second set of locations is less than a total number of locations in the column. Preferably the number of nozzles used to fill all locations in a column is equal to the number of print passes needed to print the column. All locations in the swathe are printed after all print passes using a regular repeating randomized pattern, such that be ensured that print locations are not under filled, or over filled.Type: GrantFiled: September 15, 2009Date of Patent: May 10, 2016Assignee: CAMBRIDGE DISPLAY TECHNOLOGY LIMITEDInventors: Mark Dowling, Mark Ian Crankshaw
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Publication number: 20160126461Abstract: An OLED comprising a hole-transporting layer and light-emitting layer wherein the hole-transporting layer comprises a hole-transporting polymer wherein no more than 5% of the polystyrene equivalent polymer weight measured by gel permeation chromatography consists of chains with weight of less than 50,000.Type: ApplicationFiled: October 21, 2015Publication date: May 5, 2016Applicants: Sumitomo Chemical Company Limited, Cambridge Display Technology LimitedInventors: Ruth Pegington, Martin Humphries
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Patent number: 9323373Abstract: A touch screen display device includes a plurality of display pixels for generating an image, emitters interspersed among the display pixels and emitting light, and detectors interspersed among the display pixels for detecting light. The light from the emitters is coupled into a transparent substrate to reach the front surface which transmits light incident at an angle smaller than a critical angle and which totally internally reflects light which is incident at an angle greater than the critical angle. The display device further includes processing means coupled to the emitters and detectors for detecting the light reaching each detector from different specific emitters and determining the light that is received by each detector that may be due to direct reflection from a near-field object, and the light that is totally internally reflected and which may be frustrated by a touching object.Type: GrantFiled: September 1, 2010Date of Patent: April 26, 2016Assignee: CAMBRIDGE DISPLAY TECHNOLOGY LIMITEDInventor: Euan Smith