Patents by Inventor Frederic S. Diana
Frederic S. Diana has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10890709Abstract: In one embodiment, an overhead street light (a luminaire) is formed that has an asymmetric light intensity distribution, where the peak intensity is greatest along the direction of the street, lower directly across the street, and much lower on the house side of the street. Around the edge of a circular transparent light guide are white light LEDs that inject light into the light guide. To help control the asymmetry of the light intensity distribution, sawtooth-shaped grooves are formed in the light guide surface opposite to the light-emission surface and parallel to the street. Gaussian diffusers are used to partially diffuse the light. By proper selection of the grooves, the Gaussian diffuser, and the relative amounts of light emitted by LED segments around the light guide, the desired asymmetrical light intensity distribution is achieved while a direct view of the light exit surface appears as a uniform light.Type: GrantFiled: August 8, 2019Date of Patent: January 12, 2021Assignee: Lumileds LLCInventors: Frederic S. Diana, Gregory Guth, Jeroen Den Breejen, Iain Black
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Patent number: 10809447Abstract: An apparatus is disclosed including a light guide and a plurality of light emitting diodes (LEDs). The light guide includes a rear portion including a first edge, a second edge, and a rear edge. The first edge meets the rear edge at a first obtuse angle, and the second edge meets the rear edge at a second obtuse angle. The plurality of light emitting diodes (LEDs) disposed on the first edge, the second edge, and the rear edge, and it is arranged to produce an asymmetric light distribution pattern including a rear light emission and a forward light emission having a greater peak intensity than the rear light emission.Type: GrantFiled: May 28, 2019Date of Patent: October 20, 2020Assignee: Lumileds LLCInventors: Jeroen Den Breejen, Frederic S. Diana
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Patent number: 10716183Abstract: An interface currents channeling circuit may be used to convert two current channels of a conventional two-channel driver into three driving currents for the three strings of LEDs. By doing so, the same two channel driver can be used for applications requiring just two LED arrays as well as three LED arrays.Type: GrantFiled: July 2, 2017Date of Patent: July 14, 2020Assignee: Lumileds LLCInventors: Frederic S. Diana, Yifeng Qiu
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Patent number: 10693048Abstract: A method to make light-emitting diode (LED) units include arranging LEDs in a pattern, forming an optically transparent spacer layer over the LEDs, forming an optically reflective layer over the LEDs, and singulating the LEDs into LED units. The method may further include, after forming the optically transparent spacer layer and before singulating the LEDs, forming a secondary light-emitting layer that conforms to the LEDs, cutting the LEDs to form LED groups having a same arrangement, spacing the LED groups on a support, and forming the optically reflective layer in spaces between the LED groups.Type: GrantFiled: September 2, 2016Date of Patent: June 23, 2020Assignee: Lumileds LLCInventors: Frederic S. Diana, Emo Fancsali, Thierry De Smet, Gregory Guth, Yourii Martynov, Oleg B. Shchekin, Jyoti Bhardwaj
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Patent number: 10677980Abstract: Interlocking light emitting diode (“LED”) light guide tiles are disclosed. The tiles have interlocking edge features that provide physical interlock fitting between tiles and present a continuous appearance, both in an “on,” where LEDs are powered on and emitting light state and an “off” state, where LEDs are powered off and not emitting light. The LED light guide tiles interface with LEDs (housed in or embodied as integrated circuit LED packages) to output light through the surfaces of the light guide. The interlocking edge features of the light guide tiles are shaped to obscure or block an image of the LED packages from being seen by observers looking at the light guide tiles. Light guide tile assemblies or installations can be easily formed out of interchangeable tiles with little or no requirement for relative directional alignment of the tiles.Type: GrantFiled: September 11, 2017Date of Patent: June 9, 2020Assignee: Lumileds LLCInventors: Jeroen Den Breejen, Frederic S. Diana
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Publication number: 20190361166Abstract: In one embodiment, an overhead street light (a luminaire) is formed that has an asymmetric light intensity distribution, where the peak intensity is greatest along the direction of the street, lower directly across the street, and much lower on the house side of the street. Around the edge of a circular transparent light guide are white light LEDs that inject light into the light guide. To help control the asymmetry of the light intensity distribution, sawtooth-shaped grooves are formed in the light guide surface opposite to the light-emission surface and parallel to the street. Gaussian diffusers are used to partially diffuse the light. By proper selection of the grooves, the Gaussian diffuser, and the relative amounts of light emitted by LED segments around the light guide, the desired asymmetrical light intensity distribution is achieved while a direct view of the light exit surface appears as a uniform light.Type: ApplicationFiled: August 8, 2019Publication date: November 28, 2019Inventors: Frederic S. Diana, Gregory Guth, Jeroen Den Breejen, Iain Black
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Publication number: 20190324188Abstract: An apparatus is disclosed including a light guide and a plurality of light emitting diodes (LEDs). The light guide includes a rear portion including a first edge, a second edge, and a rear edge. The first edge meets the rear edge at a first obtuse angle, and the second edge meets the rear edge at a second obtuse angle. The plurality of light emitting diodes (LEDs) disposed on the first edge, the second edge, and the rear edge, and it is arranged to produce an asymmetric light distribution pattern including a rear light emission and a forward light emission having a greater peak intensity than the rear light emission.Type: ApplicationFiled: May 28, 2019Publication date: October 24, 2019Inventors: Jeroen Den Breejen, Frederic S. Diana
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Patent number: 10416370Abstract: In one embodiment, an overhead street light (a luminaire) is formed that has an asymmetric light intensity distribution, where the peak intensity is greatest along the direction of the street, lower directly across the street, and much lower on the house side of the street. Around the edge of a circular transparent light guide are white light LEDs that inject light into the light guide. To help control the asymmetry of the light intensity distribution, sawtooth-shaped grooves are formed in the light guide surface opposite to the light-emission surface and parallel to the street. Gaussian diffusers are used to partially diffuse the light. By proper selection of the grooves, the Gaussian diffuser, and the relative amounts of light emitted by LED segments around the light guide, the desired asymmetrical light intensity distribution is achieved while a direct view of the light exit surface appears as a uniform light.Type: GrantFiled: February 21, 2017Date of Patent: September 17, 2019Assignee: Lumileds LLCInventors: Frederic S. Diana, Gregory Guth, Jeroen Den Breejen, Iain Black
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Publication number: 20190088840Abstract: A method to make light-emitting diode (LED) units include arranging LEDs in a pattern, forming an optically transparent spacer layer over the LEDs, forming an optically reflective layer over the LEDs, and singulating the LEDs into LED units. The method may further include, after forming the optically transparent spacer layer and before singulating the LEDs, forming a secondary light-emitting layer that conforms to the LEDs, cutting the LEDs to form LED groups having a same arrangement, spacing the LED groups on a support, and forming the optically reflective layer in spaces between the LED groups.Type: ApplicationFiled: September 2, 2016Publication date: March 21, 2019Applicant: Lumileds Holding B.V.Inventors: Frederic S. DIANA, Erno FANCSALI, Thierry DE SMET, Gregory GUTH, Yourii MARTYNOV, Oleg B. SHCHEKIN, Jyoti BHARDWAJ
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Publication number: 20190008013Abstract: An interface currents channeling circuit may be used to convert two current channels of a conventional two-channel driver into three driving currents for the three strings of LEDs. By doing so, the same two channel driver can be used for applications requiring just two LED arrays as well as three LED arrays.Type: ApplicationFiled: July 2, 2017Publication date: January 3, 2019Applicant: Lumileds LLCInventors: Frederic S. Diana, Yifeng Qiu
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Patent number: 10134964Abstract: In embodiments of the invention, a passivation layer is disposed over a side of a semiconductor structure including a light emitting layer disposed between an n-type region and a p-type region. A material configured to adhere to an underfill is disposed over an etched surface of the semiconductor structure.Type: GrantFiled: May 29, 2013Date of Patent: November 20, 2018Assignee: LUMILEDS LLCInventors: Frederic S. Diana, Henry Kwong-Hin Choy, Qingwei Mo, Serge L. Rudaz, Frank L. Wei, Daniel A. Steigerwald
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Publication number: 20180277727Abstract: A method includes forming a reflective layer (202) on a support (110) where the reflective layer (202) defines openings to the support, placing light-emitting diodes (LEDs) (102) through the openings onto the support (110), forming a non-planar secondary light-emitting layer (106) that conforms to the LEDs and the reflective layer (202), forming a planar optically transparent cap layer (108) over the secondary light-emitting layer, and singulating the LEDs into LED units.Type: ApplicationFiled: August 31, 2016Publication date: September 27, 2018Applicant: Lumileds LLCInventors: Frederic S. DIANA, Thierry DE SMET, Gregory GUTH
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Publication number: 20180074256Abstract: Interlocking light emitting diode (“LED”) light guide tiles are disclosed. The tiles have interlocking edge features that provide physical interlock fitting between tiles and present a continuous appearance, both in an “on,” where LEDs are powered on and emitting light state and an “off” state, where LEDs are powered off and not emitting light. The LED light guide tiles interface with LEDs (housed in or embodied as integrated circuit LED packages) to output light through the surfaces of the light guide. The interlocking edge features of the light guide tiles are shaped to obscure or block an image of the LED packages from being seen by observers looking at the light guide tiles. Light guide tile assemblies or installations can be easily formed out of interchangeable tiles with little or no requirement for relative directional alignment of the tiles.Type: ApplicationFiled: September 11, 2017Publication date: March 15, 2018Applicant: LUMILEDS LLCInventors: Jeroen DEN BREEJEN, Frederic S. DIANA
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Publication number: 20170242182Abstract: In one embodiment, an overhead street light (a luminaire) is formed that has an asymmetric light intensity distribution, where the peak intensity is greatest along the direction of the street, lower directly across the street, and much lower on the house side of the street. Around the edge of a circular transparent light guide are white light LEDs that inject light into the light guide. To help control the asymmetry of the light intensity distribution, sawtooth-shaped grooves are formed in the light guide surface opposite to the light-emission surface and parallel to the street. Gaussian diffusers are used to partially diffuse the light. By proper selection of the grooves, the Gaussian diffuser, and the relative amounts of light emitted by LED segments around the light guide, the desired asymmetrical light intensity distribution is achieved while a direct view of the light exit surface appears as a uniform light.Type: ApplicationFiled: February 21, 2017Publication date: August 24, 2017Inventors: Frederic S. Diana, Gregory Guth, Jeroen Den Breejen, Iain Black
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Patent number: 9515240Abstract: A method for increasing the luminous efficacy of a white light emitting diode (WLED), comprising introducing optically functional interfaces between an LED die and a phosphor, and between the phosphor and an outer medium, wherein at least one of the interfaces between the phosphor and the LED die provides a reflectance for light emitted by the phosphor away from the outer medium and a transmittance for light emitted by the LED die. Thus, a WLED may comprise a first material which surrounds an LED die, a phosphor layer, and at least one additional layer or material which is transparent for direct LED emission and reflective for the phosphor emission, placed between the phosphor layer and the first material which surrounds the LED die.Type: GrantFiled: November 20, 2015Date of Patent: December 6, 2016Assignee: The Regents of the University of CaliforniaInventors: Frederic S. Diana, Steven P. DenBaars, Shuji Nakamura
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Publication number: 20160079499Abstract: A method for increasing the luminous efficacy of a white light emitting diode (WLED), comprising introducing optically functional interfaces between an LED die and a phosphor, and between the phosphor and an outer medium, wherein at least one of the interfaces between the phosphor and the LED die provides a reflectance for light emitted by the phosphor away from the outer medium and a transmittance for light emitted by the LED die. Thus, a WLED may comprise a first material which surrounds an LED die, a phosphor layer, and at least one additional layer or material which is transparent for direct LED emission and reflective for the phosphor emission, placed between the phosphor layer and the first material which surrounds the LED die.Type: ApplicationFiled: November 20, 2015Publication date: March 17, 2016Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Frederic S. Diana, Steven P. DenBaars, Shuji Nakamura
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Patent number: 9219205Abstract: A method for increasing the luminous efficacy of a white light emitting diode (WLED), comprising introducing optically functional interfaces between an LED die and a phosphor, and between the phosphor and an outer medium, wherein at least one of the interfaces between the phosphor and the LED die provides a reflectance for light emitted by the phosphor away from the outer medium and a transmittance for light emitted by the LED die. Thus, a WLED may comprise a first material which surrounds an LED die, a phosphor layer, and at least one additional layer or material which is transparent for direct LED emission and reflective for the phosphor emission, placed between the phosphor layer and the first material which surrounds the LED die.Type: GrantFiled: December 6, 2013Date of Patent: December 22, 2015Assignee: The Regents of the University of CaliforniaInventors: Frederic S. Diana, Steven P. DenBaars, Shuji Nakamura
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Publication number: 20140091349Abstract: A method for increasing the luminous efficacy of a white light emitting diode (WLED), comprising introducing optically functional interfaces between an LED die and a phosphor, and between the phosphor and an outer medium, wherein at least one of the interfaces between the phosphor and the LED die provides a reflectance for light emitted by the phosphor away from the outer medium and a transmittance for light emitted by the LED die. Thus, a WLED may comprise a first material which surrounds an LED die, a phosphor layer, and at least one additional layer or material which is transparent for direct LED emission and reflective for the phosphor emission, placed between the phosphor layer and the first material which surrounds the LED die.Type: ApplicationFiled: December 6, 2013Publication date: April 3, 2014Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Frederic S. Diana, Steven P. DenBaars, Shuji Nakamura
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Patent number: 8624281Abstract: A method for increasing the luminous efficacy of a white light emitting diode (WLED), comprising introducing optically functional interfaces between an LED die and a phosphor, and between the phosphor and an outer medium, wherein at least one of the interfaces between the phosphor and the LED die provides a reflectance for light emitted by the phosphor away from the outer medium and a transmittance for light emitted by the LED die. Thus, a WLED may comprise a first material which surrounds an LED die, a phosphor layer, and at least one additional layer or material which is transparent for direct LED emission and reflective for the phosphor emission, placed between the phosphor layer and the first material which surrounds the LED die.Type: GrantFiled: December 21, 2010Date of Patent: January 7, 2014Assignee: The Regents of the University of CaliforniaInventors: Frederic S. Diana, Steven P. DenBaars, Shuji Nakamura
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Publication number: 20130252358Abstract: In embodiments of the invention, a passivation layer is disposed over a side of a semiconductor structure including a light emitting layer disposed between an n-type region and a p-type region. A material configured to adhere to an underfill is disposed over an etched surface of the semiconductor structure.Type: ApplicationFiled: May 29, 2013Publication date: September 26, 2013Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Frederic S. Diana, Henry Kwong-Hin Choy, Qingwei Mo, Serge L. Rudaz, Frank L. Wei, Daniel A. Steigerwald