Patents Assigned to Cambridge Display Technology, Ltd.
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Patent number: 6762234Abstract: The present invention provides formulations which facilitate the direct deposition of patterned polymer films. In particular, the present invention provides a formulation with which polymer films which exhibit improved emission can be uniformly deposited, particularly in the context of relatively high molecular weight polymers with intrinsically rigid conjugated systems. By way of example, a formulation comprising a conjugated polymer dissolved in a solvent comprising at least one substance selected from the group consisting of terpenes and polyalkylated aromatic compounds are demonstrated.Type: GrantFiled: January 30, 2002Date of Patent: July 13, 2004Assignees: Cambridge Display Technology Ltd., Seiko Epson CorporationInventor: Ilaria Grizzi
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Patent number: 6723811Abstract: 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: GrantFiled: April 28, 2000Date of Patent: April 20, 2004Assignee: Cambridge Display Technology Ltd.Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
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Publication number: 20040059077Abstract: 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: ApplicationFiled: August 15, 2003Publication date: March 25, 2004Applicant: Cambridge Display Technology Ltd.Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
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Patent number: 6707248Abstract: An opto-electrical device comprising an anode electrode, a cathode electrode, and an opto-electrically active region located between the electrodes, the cathode electrode including a first layer comprising a compound of a group 1, group 2 or transition metal, a second layer comprising a material having a work function below 3.5 eV, and a third layer spaced from the opto-electrically active region by the first and second layers and having a work function above 3.5 eV.Type: GrantFiled: December 19, 2001Date of Patent: March 16, 2004Assignee: Cambridge Display Technology Ltd.Inventors: Jeremy H. Burroughes, Julian C. Carter, Alec G. Gunner, Stephen K. Heeks
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Patent number: 6693611Abstract: A display device comprising an array of light-emissive pixels, each pixel comprising red, green and blue light emitters and at least one further light emitter for emitting a color to which the human eye is more sensitive than the emission color of at least one of the red and blue emitters.Type: GrantFiled: April 23, 2001Date of Patent: February 17, 2004Assignee: Cambridge Display Technology Ltd.Inventor: Jeremy Burroughes
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Patent number: 6639250Abstract: An efficient multiple-wavelength light emitting device is provided. This multiple-wavelength light emitting device comprises a light emitting layer 4 for emitting light containing wavelength components to be output, a negative electrode 5 that is positioned at the back surface of the light emitting layer and that transmits at least a portion of the light, reflecting layers 7R, 7G, and 7B, positioned at the back surface of the negative electrode, for reflecting, of the light emitted through the negative electrode to the back surface, light having specific wavelengths, which reflecting layers are stacked up in order perpendicularly to the light axis, in correspondence with the wavelengths of the light to be reflected, thus configuring a reflecting layer group 7. In the direction perpendicular to the light axis, divisions are made in any of at least two or more light emission regions which reflect light of different wavelengths.Type: GrantFiled: June 18, 2001Date of Patent: October 28, 2003Assignees: Seiko Epson Corporation, Cambridge Display Technology, Ltd.Inventors: Tatsuya Shimoda, Tomoko Koyama, Takeo Kaneko, Jeremy Henry Burroughes
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Publication number: 20030166810Abstract: 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: ApplicationFiled: December 6, 2002Publication date: September 4, 2003Applicant: Cambridge Display Technology Ltd.Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
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Patent number: 6605823Abstract: A method of manufacturing 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 includes an anode protection layer (6) which protects the anode (10) against the effects of converting a precursor polymer to a semiconductive conjugated polymer which constitutes the light emissive layer (8). This has been found to increase the brightness and half-life of devices.Type: GrantFiled: May 10, 1999Date of Patent: August 12, 2003Assignee: Cambridge Display Technology Ltd.Inventors: Karl Pichler, Carl Towns
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Patent number: 6580212Abstract: A display device comprising: a light-emissive structure including two regions of light emissive material for emitting light in a viewing direction, the regions being spaced apart in a direction perpendicular to the viewing direction the light-emissive structure being capable of guiding light emitted from one of the light-emissive regions towards the other emissive region; and a barrier structure located between the light-emissive regions for inhibiting the propagation of light guided from the said one of the light-emissive regions to the other light-emissive region.Type: GrantFiled: May 31, 2000Date of Patent: June 17, 2003Assignee: Cambridge Display Technology Ltd.Inventor: Richard Henry Friend
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Patent number: 6576093Abstract: A method of reducing black spots in a light-emitting device comprising a light-emissive material interposed between a first electrode and a second electrode such that the first and second electrodes are capable of injecting charge carriers into the light-emissive organic material, the method comprising: forming at least one of the first and second electrodes by depositing onto the light-emissive organic material a first layer of a material by a deposition technique which intrinsically results in undesirable pin-holes; and depositing a second layer of a material onto the first layer by a conformable deposition technique.Type: GrantFiled: September 24, 2001Date of Patent: June 10, 2003Assignee: Cambridge Display Technology, Ltd.Inventors: Jeremy Henley Burroughes, Julian Charles Carter, Stephen Karl Heeks
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Patent number: 6559256Abstract: 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: GrantFiled: April 28, 2000Date of Patent: May 6, 2003Assignee: Cambridge Display Technology Ltd.Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
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Patent number: 6512082Abstract: A polymer which comprises triarylamine units, which polymer comprises one or more structural units comprising Arh-NAr2, where Arh comprises a substituted or unsubstituted heteroaryl group and each Ar is the same or different and comprises a substituted or unsubstituted aryl or heteroaryl group and excluding the copolymer where the polymer backbone contains one or more divinylenearylene units.Type: GrantFiled: January 4, 2001Date of Patent: January 28, 2003Assignee: Cambridge Display Technology Ltd.Inventors: Carl R. Towns, Richard O'Dell
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Patent number: 6429601Abstract: An organic light-emitting device having an organic light-emitting region comprising a plurality of organic light-emitting pixels; switch means each associated with a respective pixel for switching power to that pixel; and drive means for driving each switch means to cycle between a first, low power mode and a second, high power mode, at a frequency sufficient to cause light emission from the associated pixel to appeal substantially continuous, the duration of the highpower mode relative to the low power mode being variable so as to vary the average brightness of the pixel.Type: GrantFiled: August 17, 2000Date of Patent: August 6, 2002Assignee: Cambridge Display Technology Ltd.Inventors: Richard H. Friend, Jeremy H. Burroughes, Mutsumi Kimura, Stephen K. Heeks
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Publication number: 20020011779Abstract: An electroluminescent device comprising: a first charge-carrier injecting layer for injecting positive charge carriers and a second charge-carrier injecting layer for injecting negative charge carriers, at least one of the charge-carrier injecting layers being patterned so as to comprise spaced-apart charge-injecting regions; an organic light-emitting layer located between the first and second charge-carrier injecting layers; and an unpatterned conductive polymer layer located between the organic light-emitting layer and the patterned charge-carrier injecting layer, the resistivity of the conductive polymer layer being sufficiently low to allow charge carriers to flow through it from the charge-injecting regions to generate light in the organic light-emitting layer but sufficiently high to resist lateral spreading of charge carriers beyond the charge-injecting regions.Type: ApplicationFiled: October 15, 2001Publication date: January 31, 2002Applicant: Cambridge Display Technology Ltd.Inventors: Carl Robert Towns, Stephen Karl Heeks, Julian Charles Carter
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Patent number: 6255774Abstract: An organic light-emitting device wherein the cathode (4, 5) comprises a first layer (5) of a conducting material and a second layer (4) of a conductive material having a work function of at most 3.7 eV and wherein the second layer is substantially thinner than the first layer, having a thickness of at most 5 nm.Type: GrantFiled: June 18, 1999Date of Patent: July 3, 2001Assignee: Cambridge Display Technology, Ltd.Inventor: Karl Pichler
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Patent number: 6153711Abstract: A method for tailoring the viscosity of a conjugated polymer precursor, the method comprising synthesizing the precursor by a polymerization reaction and, during the polymerization reaction, applying a shear to the reactants of the polymerization reaction so as to define the viscosity of the precursor at a desired value.Type: GrantFiled: July 27, 1999Date of Patent: November 28, 2000Assignee: Cambridge Display Technology Ltd.Inventors: Carl Towns, Ilaria Grizzi
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Patent number: 5969475Abstract: A light-emitting cavity device comprising: a pair of mirrors spaced apart to define a resonant cavity; a luminescent layer located in the cavity; and a control layer located in the cavity and controllable to adjust the resonance wavelength of the cavity and thereby spectrally redistribute the energy emitted by the luminescent layer.Type: GrantFiled: December 3, 1997Date of Patent: October 19, 1999Assignee: Cambridge Display Technology Ltd.Inventors: Richard Henry Friend, Helmut Becker
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Patent number: 5965901Abstract: A light-emissive polymer device comprising: an anode; a cathode; a conjugated light-emissive polymer layer located between the anode and the cathode; and a driver for applying a voltage drive scheme between the anode and the cathode of a pattern having a relatively high voltage portion which causes the polymer layer to emit light and a relatively low voltage portion during which substantially no light is emitted by the polymer layer.Type: GrantFiled: November 26, 1997Date of Patent: October 12, 1999Assignee: Cambridge Display Technology Ltd.Inventors: Stephen Karl Heeks, Hermann Felix Wittmann
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Patent number: 5807627Abstract: An electroluminescent device has at least two active semiconductive conjugated polymer light emitting layers arranged between a cathode and an anode. The layers are arranged so that at least part of at least two layers lie in an emission zone of the device.Type: GrantFiled: April 30, 1997Date of Patent: September 15, 1998Assignee: Cambridge Display Technologies Ltd.Inventors: Richard Henry Friend, Andrew Bruce Holmes, Donal Donat Conor Bradley, Paul Leslie Burn, Arno Kraft, Adam Richard Brown, Jeremy Henley Burroughes, Neil Clement Greenham