Patents Assigned to Lumileds LLC
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Publication number: 20190128493Abstract: The invention relates to a headlight for a vehicle, comprising a concave reflector and a lamp arranged within the reflector to reflect light from the lamp to create an illumination beam with a bright/dark boundary. The lamp comprises a transparent vessel including a longitudinal axis, at least a first and second filament arranged within the vessel. A baffle arranged proximate to the first filament, and comprising first and second upper side edges. The first filament is arranged above a plane including the upper side edges. A different plane is through the center of the first filament and is arranged perpendicular to the longitudinal axis. The upper side edges are arranged symmetrically to a baffle symmetry axis extending from the center of the first filament centrally between the upper side edges. The lamp is arranged within the reflector rotated around said longitudinal axis by a rotation angle of 2°-20°.Type: ApplicationFiled: May 23, 2017Publication date: May 2, 2019Applicant: Lumileds LLCInventors: Lukas KUEPPER, Bernd SCHOENFELDER, Kang LU, Ping WU
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Patent number: 10276763Abstract: Light emitting devices (LEDs) are described herein. An LED includes a light emitting semiconductor structure, a wavelength converting material and an off state white material. The light emitting semiconductor structure includes a light-emitting active layer disposed between an n-layer and a p-layer. The wavelength converting material has a first surface adjacent the light emitting semiconductor structure and a second surface opposite the first surface. The off state white material is in direct contact with the second surface of the wavelength converting material and includes multiple core-shell particles disposed in an optically functional material. Each of the core-shell particles includes a core material encased in a polymer or inorganic shell. The core material includes a phase change material.Type: GrantFiled: October 2, 2017Date of Patent: April 30, 2019Assignee: Lumileds LLCInventors: Daniel Estrada, Ken Shimizu, Daniel Roitman, Marcel Rene Bohmer, Edward Kang
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Patent number: 10276758Abstract: A two-stage singulation process is used in the fabrication of phosphor coated light emitting elements. Prior to the application of the phosphor coating, the individual light emitting elements are singulated using a laser dicing process (130); after application of the phosphor coating (150), the phosphor coated light emitting elements are singulated using a mechanical dicing process (180). Before laser dicing of the light emitting elements, the wafer is positioned on a piece of dicing- or die-attach-tape held by a frame; after laser dicing, the tape is stretched (140) to provide space between the individual light emitting elements that allows for the wider kerf width of the subsequent mechanical dicing (180) after application of the phosphor coating (150).Type: GrantFiled: March 8, 2013Date of Patent: April 30, 2019Assignee: Lumileds LLCInventor: Frank Lili Wei
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Publication number: 20190124776Abstract: LEDs for an illumination system may be mounted on a PCB. The PCB may be provided with alignment features such as oversized holes for connection to a support surface. Using optical sensing of the position of the mounted LEDs, the space made available by the alignment features may be reduced and aligned to create modified alignment features. The modified alignment features may be created by adding a modifying component and aligned based on the sensed positions of the mounted LEDs. The positioning of the modifying component may offset misalignment of the LEDs with the PCB. An opening in the modified alignment feature may receive a bolt or alignment pin for connection to the support surface. The support surface may be aligned with the secondary optics, resulting in the LEDs being aligned with the secondary optics irrespective of misalignment of the LEDs with respect to the PCB.Type: ApplicationFiled: December 14, 2018Publication date: April 25, 2019Applicant: Lumileds LLCInventor: Axel MEHNERT
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Publication number: 20190123250Abstract: A light-emitting device is disclosed. The light emitting device includes a base, a reflective layer formed on the base, a coating layer formed on the reflective layer, a sidewall disposed on the base, the sidewall being arranged to form a reflector cup, and a light-emitting diode (LED) chip disposed in the reflector cup.Type: ApplicationFiled: October 19, 2017Publication date: April 25, 2019Applicant: Lumileds LLCInventor: Shu Li
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Publication number: 20190123095Abstract: Described herein is source sensitive optic that uses reconfigurable chip-on-board (CoB) light emitting diode (LED) arrays as light sources. In an implementation, the reconfigurable CoB LED array includes a predetermined number of LEDs that are configurable for a variety of illumination scenarios. In an implementation, the reconfigurable CoB LED array is multiple CoB LED arrays that are configured for use with the source sensitive optic as described herein. The source sensitive optic includes surface shapes that are responsive to the reconfigurable CoB LED array. The source sensitive optic is configured to provide beam profile and radiation pattern differentiation based on a CoB LED array configuration configured from the reconfigurable CoB LED. Each configurable CoB LED array configuration radiates a different beam pattern via the surface shapes due to proximity and surface shape geometries.Type: ApplicationFiled: October 25, 2017Publication date: April 25, 2019Applicant: Lumileds LLCInventors: Charles SCHRAMA, Varun Dev KAKKAR, Erno FANCSALI
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Patent number: 10270013Abstract: In embodiments of the invention, a light emitting device includes a semiconductor structure including a light emitting layer disposed between an n-type region and a p-type region. A first wavelength converting layer is disposed in a path of light emitted by the light emitting layer. The first wavelength converting layer may be a wavelength converting ceramic. A second wavelength converting layer is fused to the first wavelength converting layer. The second wavelength converting layer may be a wavelength converting material disposed in glass.Type: GrantFiled: August 17, 2017Date of Patent: April 23, 2019Assignee: LUMILEDS LLCInventors: April Dawn Schricker, Oleg Borisovich Shchekin, Han Ho Choi, Peter Josef Schmidt
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Publication number: 20190115492Abstract: A device, system and method for producing enhanced external quantum efficiency (EQE) LED emission are disclosed. The device, system and method include a patterned layer configured to transform surface modes into directional radiation, a semiconductor layer formed as a III/V direct bandgap semiconductor to produce radiation, and a metal back reflector layer configured to reflect incident radiation. The patterned layer may be one-dimensional, two-dimensional or three-dimensional. The patterned layer may be submerged within the semiconductor layer or within the dielectric layer. The semiconductor layer is p-type gallium nitride (GaN). The patterned layer may be a hyperbolic metamaterials (HMM) layer and may include Photonic Hypercrystal (PhHc), or may be a low or high refractive index material or may be a metal.Type: ApplicationFiled: October 15, 2018Publication date: April 18, 2019Applicant: Lumileds LLCInventors: Venkata Ananth TAMMA, Toni LOPEZ
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Publication number: 20190115496Abstract: A system, method and device for use as a reflector for a light emitting diode (LED) are disclosed. The system, method and device include a first layer designed to reflect transverse-electric (TE) radiation emitted by the LED, a second layer designed to block transverse-magnetic (TM) radiation emitted from the LED, and a plurality of ITO layers designed to operate as a transparent conducting oxide layer. The first layer may be a one-dimension (1D) distributed Bragg reflective (DBR) layer. The second layer may be a two-dimension (2D) photonic crystal (PhC), a three-dimension (3D) PhC, and/or a hyperbolic metamaterial (HMM). The 2D PhC may include horizontal cylinder bars, vertical cylinder bars, or both. The system, method and device may include a bottom metal reflector that may be Ag free and may act as a bonding layer.Type: ApplicationFiled: October 15, 2018Publication date: April 18, 2019Applicant: Lumileds LLCInventors: Toni LOPEZ, Venkata Ananth TAMMA
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Publication number: 20190113727Abstract: A system, method and device for collimating the output of a light emitting diode (LED) are disclosed. The system, method and device include an LED substrate including a top surface from which the light is emitted, and an array of subwavelength scattering antennas positioned within the emitted light path, the array of subwavelength scattering antennas configured to select directions of scatter of the LED emitted light to provide collimated light output from the device. The array may be aligned perpendicular to the plane of propagation of the light emitted from the LED and may be positioned adjacent to the top surface. The array may be at least partially, or completely, positioned within the LED substrate. The array may be spaced a distance from the top surface and the spacing may be achieved using a dielectric spacer adjacent to the top surface. The array may be positioned within the dielectric spacer.Type: ApplicationFiled: October 16, 2018Publication date: April 18, 2019Applicant: Lumileds LLCInventor: Venkata Ananth TAMMA
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Patent number: 10260684Abstract: An LED bulb (10) includes a metal lead frame (50) on which is directly mounted a low beam set of first LED dies (14), a high beam set of second LED dies (16), and a high beam set of third LED dies (16). The lead frame (50) is bent so that the first LED dies (14) face upwards and the second and third LED dies (16) face sideways and in opposite directions. A thermally conductive opaque plastic body is molded around the lead frame and exposes the LED dies. The body includes light-blocking features (26, 32, 40) to cause the light emission pattern of the first LED dies (14) to be limited in lateral and vertical directions for a low beam of a headlight. The light-blocking features also cause the light emission pattern of the second and third LED dies (16) to be less limited in the lateral and vertical directions for a wider high beam of the headlight.Type: GrantFiled: December 16, 2014Date of Patent: April 16, 2019Assignee: Lumileds LLCInventors: Marcus Johannes Gerardus Elzinga, Paul Scott Martin
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Publication number: 20190109268Abstract: A light-emitting device is disclosed, including: a substrate; a light-emitting diode (LED) formed on a first surface of the substrate, the LED being arranged to emit primary light; a fence disposed on a second surface of the substrate, the fence including a plurality of walls arranged to define a cell; a light-converting structure disposed in the cell, the light-converting structure being arranged to convert at least a portion of the primary light to secondary light having a wavelength that is different from the wavelength of the primary light; and a reflective element formed on one or more outer surfaces of the walls of the fence, such that the reflective element and the light-converting structure are disposed on opposite sides of the walls of the fence.Type: ApplicationFiled: October 10, 2017Publication date: April 11, 2019Applicant: Lumileds LLCInventors: Brendan Moran, Lex Kosowsky
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Patent number: 10257904Abstract: A control circuit for a light emitting diode (LED) lighting system for achieving a dim-to-warm effect is provided. The control circuit includes an LED controller, a clamp circuit coupled to a set of warm correlated-color-temperature (“CCT”) LEDs, a switch coupled to a set of cool LEDs, and a feedback circuit coupled to the clamp and the switch. The LED controller is configured to control the clamp circuit to clamp current through the set of warm LEDs based on the input current, and control the switch to switch on the set of cool LEDs responsive to the input current being greater than a first threshold level and to switch off the set of cool LEDs responsive to the input current being lower than the first threshold level. The feedback circuit is configured to divert current from the set of warm LEDs to the set of cool LEDs.Type: GrantFiled: July 3, 2018Date of Patent: April 9, 2019Assignee: LUMILEDS LLCInventors: Yifeng Qiu, Jeroen Den Breejen
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Publication number: 20190103511Abstract: A device comprising a semiconductor structure comprising a light emitting layer disposed between an n-type region and a p-type region is disclosed. The device comprises a porous region. The device comprises a first layer disposed between the light emitting layer and the porous region. The device comprises a mask layer disposed between the porous region and the first layer. The device comprises a plurality of openings formed in the mask layer.Type: ApplicationFiled: October 1, 2018Publication date: April 4, 2019Applicant: LUMILEDS LLCInventors: Jonathan J. Wierer, John E. Epler
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Publication number: 20190103508Abstract: A method according to embodiments of the invention includes providing a light emitting semiconductor structure grown on a substrate. The substrate has a front side and a back side opposite the front side. Notches are formed in the substrate. The notches extend from the front side of the substrate into the substrate. After forming notches in the substrate, the back side of the substrate is thinned to expose the notches.Type: ApplicationFiled: September 18, 2018Publication date: April 4, 2019Applicant: Lumileds LLCInventors: Filip Ilievski, Norbertus Antonius Maria Sweegers, Kwong-Hin Henry Choy, Marc Andre De Samber
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Patent number: 10249807Abstract: A solid state light-emitting device (LED) lighting apparatus comprising a leadframe assembly comprising leadframes spaced apart at a pitch, each leadframe comprising at least one pad, interconnects each linking two adjacent leadframes, LEDs mounted on the leadframes, and bidirectional spreading lenses disposed about the LEDs, each bidirectional spreading lens having a spreading axis and a null axis perpendicular to the spreading axis, each bidirectional spreading lens directing more light in opposite directions along the spreading axis than the null axis, the spreading axis being aligned along the length of the stretched leadframe assembly.Type: GrantFiled: June 11, 2018Date of Patent: April 2, 2019Assignee: Lumileds LLCInventors: Serge Joel Armand Bierhuizen, Giovanni Cennini
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Publication number: 20190093832Abstract: A light emitting device is disclosed and includes an emission source configured to emit a primary blue light and a wavelength-converting element configured to convert the primary blue light to a secondary light having a correlated color temperature (CCT) in the range of 1600K-2500K and color rendering index (CRI) in the range of 40-60, the wavelength-converting element including a red phosphor material having a peak emission wavelength that is less than 620 nm and a green phosphor material having a peak emission wavelength that is greater than 530 nm. The device may exhibit a melanopic/photopic ratio of less than 0.25 and/or may exhibit a radiometric power fraction of light having a wavelength below 530 nm below 0.1.Type: ApplicationFiled: September 24, 2018Publication date: March 28, 2019Applicant: Lumileds LLCInventors: Walter SOER, Hans-Helmut BECHTEL
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Patent number: 10236409Abstract: Described herein are methods for using remote plasma chemical vapor deposition (RP-CVD) and sputtering deposition to grow layers for light emitting devices. A method includes growing a light emitting device structure on a growth substrate, and growing a tunnel junction on the light emitting device structure using at least one of RP-CVD and sputtering deposition. The tunnel junction includes a p++ layer in direct contact with a p-type region, where the p++ layer is grown by using at least one of RP-CVD and sputtering deposition. Another method for growing a device includes growing a p-type region over a growth substrate using at least one of RP-CVD and sputtering deposition, and growing further layers over the p-type region. Another method for growing a device includes growing a light emitting region and an n-type region using at least one of RP-CVD and sputtering deposition over a p-type region.Type: GrantFiled: May 19, 2017Date of Patent: March 19, 2019Assignee: Lumileds LLCInventors: Isaac Wildeson, Parijat Deb, Erik Charles Nelson, Junko Kobayashi
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Patent number: 10237980Abstract: A patterned conductive layer on a flexible substrate includes pads for mounting an array of LEDs, conductive strips, and conductive tabs that couple the conductive strips to the pads. The desired circuit configuration is created by removing select tabs by punching holes or otherwise piercing the flexible substrate at the location of the tabs. In some embodiments, the patterned conductive layer is arranged to permit each LED to be mounted in either of two mirrored orientations, and in some embodiments, the patterned conductive layer is arranged to permit a separation between LEDs that is not predefined by the pattern. In some embodiments, the unmodified patterned conductive layer is arranged to provide a parallel circuit configuration, and the modified patterned conductive layer is arranged to provide a series or series-parallel configuration.Type: GrantFiled: December 16, 2014Date of Patent: March 19, 2019Assignee: Lumileds LLCInventors: Frederic Stephane Diana, Patrick Allen Bournes, Walter Daeschner, Yong Seok Choi, Axel Mehnert, Mohiuddin Mala
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Patent number: 10236429Abstract: A mounting assembly (10) is disclosed for mounting and connecting an electrical device, in particular a light emitting diode. The mounting assembly (10) comprises a mounting element (12) including at least two metal layers (14, 16) each having a top surface (24) and a bottom surface (28). Top contact pads are formed at the top surface of each of the metal layers for providing a planar electrical and thermal contact to the electrical device. Bottom contact pads are formed at the bottom surface of each of the metal layers for providing a planar electrical and thermal contact to a mounting board (34).Type: GrantFiled: November 24, 2014Date of Patent: March 19, 2019Assignee: Lumileds LLCInventors: Gerard Kums, Sander Petrus Martinus Noijen
