Patents by Inventor Hisashi Masui
Hisashi Masui 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).
-
Publication number: 20220238767Abstract: An array of phosphor pixels is positioned on an array of semiconductor LED pixels with thermally curable adhesive between them. Selected LED pixels of the array are electrically activated; resulting heat cures the adhesive to attach the corresponding phosphor pixel to the activated LED pixel and to release the corresponding phosphor pixel from a carrier. Removal of the carrier removes unattached phosphor pixels, leaving behind phosphor pixels attached to the LED pixels that were activated. The process can be repeated for phosphor pixels of different colors.Type: ApplicationFiled: April 13, 2022Publication date: July 28, 2022Applicant: Lumileds LLCInventors: Emma DOHNER, Kentaro SHIMIZU, Hisashi MASUI
-
Patent number: 11217734Abstract: Patterned ceramic wavelength-converting phosphor structures may be bonded to an LED to form a pcLED. The phosphor structures are patterned with features that provide enhanced oxygen permeability to an adhesive bond used to attach the phosphor structure to the LED. The enhanced oxygen permeability reduces transient degradation of the pcLED occurring in the region of the adhesive bond.Type: GrantFiled: October 11, 2019Date of Patent: January 4, 2022Assignee: Lumileds LLCInventors: Kentaro Shimizu, Hisashi Masui, Marcel Rene Bohmer, Vernon Wong
-
Publication number: 20210325023Abstract: A device including a phosphor layer having a plurality of holes or pockets arranged within the phosphor layer to reduce lateral light transmission. The phosphor layer can be sized and positioned to extend over a plurality of LED emitter pixels.Type: ApplicationFiled: June 30, 2021Publication date: October 21, 2021Applicant: Lumileds LLCInventors: Kentaro SHIMIZU, Venkata Ananth TAMMA, Hisashi MASUI
-
Patent number: 11127887Abstract: A semiconductor light emitting device (100;200;300;400,400B,400C;500;600;700) may have a reflective side coating (120;220;320;420;520;620;720) disposed on a sidewall (118;215;315;415,435;515) of a semiconductor light emitting device structure. Such a device may be fabricated by dicing a semiconductor structure to separate a semiconductor light emitting device structure and then forming a reflective side coating (120;220;320;420;520;620;720) on a sidewall (118;215;315;415,435;515) of the separated semiconductor light emitting device structure.Type: GrantFiled: July 13, 2016Date of Patent: September 21, 2021Assignee: Lumileds LLCInventors: Hisashi Masui, Oleg B. Shchekin, Ken Shimizu, Lex Kosowsky, Ken Davis
-
Publication number: 20210247312Abstract: In a gas sensing system, a light emitter can emit light through a gas sample toward a concave reflective surface. The reflective surface can redirect the emitted light to propagate through the gas sample toward a light sensor. Using, optionally, the Beer-Lambert Law, the system can determine a concentration of the gas material in the gas sample. By selecting a specified shape for the reflective surface, such as a complete or partial ellipsoid, and locating the light emitter and the light sensor in specified locations, such as at one or both foci of the ellipsoid, the gas sensing system can reduce variation in optical path length, from optical path to optical path, in the light that propagates from the light emitter, to the reflective surface, and to the light sensor. Reducing the variation in optical path length can improve an accuracy in determining the concentration of the gas material.Type: ApplicationFiled: November 5, 2020Publication date: August 12, 2021Inventors: Hisashi Masui, Oleg Borisovich Shchekin, Franklin Chiang
-
Publication number: 20210247309Abstract: A gas sensing system can allow a gas sample to permeate hollow spaces within a porous scattering material. The porous scattering material can be substantially transparent at an illumination wavelength. An emitter can illuminate the porous scattering material and the gas sample with light having a spectrum that includes the illumination wavelength. A sensor can detect a level of light that has traversed the porous scattering material. Using, for example, the Beer-Lambert Law, the system can determine a concentration of the gas material in the gas sample. The scattering can greatly increase an optical path length through the porous scattering material, compared with a linear dimension of the porous scattering material. The increased optical path length can allow a gas chamber to shrink in size, thereby decreasing a size of the gas sensing system without a corresponding decrease in a sensitivity and/or an accuracy of the system.Type: ApplicationFiled: November 5, 2020Publication date: August 12, 2021Inventors: Hisashi Masui, Oleg Borisovich Shchekin, Franklin Chiang
-
Patent number: 11063191Abstract: A phosphor carrier assembly includes a substrate, a thermal or UV activated release adhesive, a layer containing a pixelated phosphor array, and a partially cured or highly viscous adhesive. The phosphor pixels on the carrier are typically all of the same color. In formation of a phosphor converted LED array the phosphor pixels on the carrier assembly are aligned with and placed in contact with corresponding LED pixels in an array of pixelated LED dice. Selected phosphor pixels on the carrier assembly may then be attached to corresponding LED pixels, and released from the substrate, by powering (activating) the corresponding LED pixels to heat the selected phosphor pixel to a temperature that releases the thermal release adhesive and that cures or partially cures the adhesive on the selected phosphor pixels in contact with the corresponding LED pixels.Type: GrantFiled: October 15, 2019Date of Patent: July 13, 2021Assignee: Lumileds LLCInventors: Emma Dohner, Kentaro Shimizu, Hisashi Masui
-
Patent number: 11054112Abstract: A device including a phosphor layer having a plurality of air gaps arranged within the phosphor layer to block lateral light transmission. The phosphor layer can be sized and positioned to be continuously extend over a plurality of LED emitter pixels.Type: GrantFiled: December 20, 2018Date of Patent: July 6, 2021Assignee: Lumileds LLCInventors: Kentaro Shimizu, Venkata Ananth Tamma, Hisashi Masui
-
Publication number: 20210184085Abstract: Sidewall reflector structures disposed on the sidewalls of an LED or pcLED comprise a thin specular reflection layer and a light scattering layer disposed between the sidewall and the specular reflection layer. These sidewall reflector structures are more diffusively reflective than a specular reflector, yet maintain high reflectivity.Type: ApplicationFiled: December 12, 2019Publication date: June 17, 2021Inventors: Hisashi MASUI, Kentaro SHIMIZU, Ryan SPRINGER, Noad SHAPIRO
-
Publication number: 20210151500Abstract: Pixelated array light emitters are formed with closely-spaced pixels having ultra-smooth sidewalk. In methods for making such pixelated array light emitters, a converter layer of phosphor particles dispersed in a binder is disposed on a carrier, and then singulated by saw cuts or similar methods to form an array of phosphor pixels. The binder is fully cured prior to singulation of the converter layer. Further, the carrier is rigid rather than flexible. As a consequence of fully curing the binder and of using a rigid carrier to support the converter layer, singulation results in phosphor pixels having smooth side walls. The array of phosphor pixels is subsequently attached to a corresponding array of LEDs with an adhesive layer, separate from the binder used to form the converter layer. The pixel sidewalls may be formed with controlled morphology, for example at acute or obtuse angles with respect to the carrier.Type: ApplicationFiled: January 25, 2021Publication date: May 20, 2021Applicant: LUMILEDS LLCInventors: Hisashi MASUI, Ken SHIMIZU, Emma DOHNER
-
Publication number: 20210111315Abstract: A phosphor carrier assembly includes a substrate, a thermal or UV activated release adhesive, a layer containing a pixelated phosphor array, and a partially cured or highly viscous adhesive. The phosphor pixels on the carrier are typically all of the same color. In formation of a phosphor converted LED array the phosphor pixels on the carrier assembly are aligned with and placed in contact with corresponding LED pixels in an array of pixelated LED dice. Selected phosphor pixels on the carrier assembly may then be attached to corresponding LED pixels, and released from the substrate, by powering (activating) the corresponding LED pixels to heat the selected phosphor pixel to a temperature that releases the thermal release adhesive and that cures or partially cures the adhesive on the selected phosphor pixels in contact with the corresponding LED pixels.Type: ApplicationFiled: October 15, 2019Publication date: April 15, 2021Applicant: Lumileds LLCInventors: Emma DOHNER, Kentaro SHIMIZU, Hisashi MASUI
-
Patent number: 10910433Abstract: The pcLED pixels in a phosphor-converted LED array each comprise an optical element on the light-emitting surface above the phosphor layer. In methods for making such pixelated LED arrays, a thin layer of a sacrificial phosphor carrier substrate is retained as the optical element on the output surface of the phosphor pixels upon completion of the fabrication process.Type: GrantFiled: March 19, 2019Date of Patent: February 2, 2021Assignee: Lumileds LLCInventors: Hisashi Masui, Ken Shimizu, Emma Dohner
-
Patent number: 10903266Abstract: Pixelated array light emitters are formed with closely-spaced pixels having ultra-smooth sidewalls. In methods for making such pixelated array light emitters, a converter layer of phosphor particles dispersed in a binder is disposed on a carrier, and then singulated by saw cuts or similar methods to form an array of phosphor pixels. The binder is fully cured prior to singulation of the converter layer. Further, the carrier is rigid rather than flexible. As a consequence of fully curing the binder and of using a rigid carrier to support the converter layer, singulation results in phosphor pixels having smooth side walls. The array of phosphor pixels is subsequently attached to a corresponding array of LEDs with an adhesive layer, separate from the binder used to form the converter layer. The pixel sidewalls may be formed with controlled morphology, for example at acute or obtuse angles with respect to the carrier.Type: GrantFiled: March 19, 2019Date of Patent: January 26, 2021Assignee: Lumileds LLCInventors: Hisashi Masui, Ken Shimizu, Emma Dohner
-
Publication number: 20210013380Abstract: Systems for apparatuses formed of light emitting devices. Solutions for controlling the off-state appearance of lighting system designs is disclosed. Thermochromic materials are selected in accordance with a desired off-state of an LED device. The thermochromic materials are applied to a structure that is in a light path of light emitted by the LED device. In the off-state the LED device produces a desired off-state colored appearance. When the LED device is in the on-state, the thermochromic materials heat up and become more and more transparent. The light emitted from the device in its on-state does not suffer from color shifting due to the presence of the thermochromic materials. Furthermore, light emitted from the LED device in its on-state does not suffer from attenuation due to the presence of the thermochromic materials. Techniques to select and position thermochromic materials in or around LED apparatuses are presented.Type: ApplicationFiled: September 22, 2020Publication date: January 14, 2021Applicant: LUMILEDS LLCInventors: Hisashi MASUI, Okeg SHCHEKIN, Ken SHIMIZU, Marcel BOHMER, Frank JIN, Jyoti BHARDWAJ
-
Patent number: 10886703Abstract: A distributed Bragg reflector (DBR) structure on a substrate includes a high refractive index layer comprising titanium oxide (TiO2) and a low refractive index layer having a high carbon region and at least one low carbon region that contacts the high refractive index layer. Multiple layers of the high refractive index layer and the low refractive index layer are stacked. Typically, the multiple layers of the high refractive index layer and the low refractive index layer are stacked to a thickness of less than 10 microns. Each of the respective layers of the high refractive index layer and the low refractive index layer have a thickness of less than 0.2 microns.Type: GrantFiled: June 27, 2019Date of Patent: January 5, 2021Assignee: Lumileds LLCInventors: Ken Shimizu, Hisashi Masui, Ted Wangensteen
-
Publication number: 20200412097Abstract: A distributed Bragg reflector (DBR) structure on a substrate includes a high refractive index layer comprising titanium oxide (TiO2) and a low refractive index layer having a high carbon region and at least one low carbon region that contacts the high refractive index layer. Multiple layers of the high refractive index layer and the low refractive index layer are stacked. Typically, the multiple layers of the high refractive index layer and the low refractive index layer are stacked to a thickness of less than 10 microns. Each of the respective layers of the high refractive index layer and the low refractive index layer have a thickness of less than 0.2 microns.Type: ApplicationFiled: June 27, 2019Publication date: December 31, 2020Applicant: Lumileds LLCInventors: Ken SHIMIZU, Hisashi MASUI, Ted WANGENSTEEN
-
Publication number: 20200412098Abstract: A distributed Bragg reflector (DBR) structure on a substrate includes a high refractive index layer comprising titanium oxide (TiO2) and a low refractive index layer having a high carbon region and at least one low carbon region that contacts the high refractive index layer. Multiple layers of the high refractive index layer and the low refractive index layer are stacked. Typically, the multiple layers of the high refractive index layer and the low refractive index layer are stacked to a thickness of less than 10 microns. Each of the respective layers of the high refractive index layer and the low refractive index layer have a thickness of less than 0.2 microns.Type: ApplicationFiled: July 31, 2020Publication date: December 31, 2020Applicant: Lumileds LLCInventors: Ken SHIMIZU, Hisashi MASUI, Ted WANGENSTEEN
-
Patent number: 10854795Abstract: A Light Emitting Device (LED) that has increased reliability and efficiency. Specifically, the LED may be formed using Atomic Layer Deposition to improve the thermal conductivity between the ceramic plate and the LED, decrease the amount of organic contamination, and increase the efficiency of the optical output of the LED.Type: GrantFiled: September 9, 2019Date of Patent: December 1, 2020Assignee: Lumileds LLCInventors: Ken T. Shimizu, Hisashi Masui, Daniel B. Roitman
-
Patent number: 10854794Abstract: A wavelength converting layer is partially diced to generate a first and second wavelength converting layer segment and to allow partial isolation between the first segment and the second segment such that the wavelength converting layer segments are connected by a connecting wavelength converting layer. The first and second wavelength converting layer segments are attached to a first and second light emitting device, respectively to create a first and second pixel. The connecting wavelength converting layer segment is removed to allow complete isolation between the first pixel and the second pixel. An optical isolation material is applied to exposed surfaces of the first and second pixel and a sacrificial portion of the wavelength converting layer segments and optical isolation material attached to the sacrificial portion is removed from a surface facing away from the first light emitting device, to expose a emitting surface of the first wavelength converting layer segment.Type: GrantFiled: December 19, 2018Date of Patent: December 1, 2020Assignee: Lumileds LLCInventors: Kentaro Shimizu, Hisashi Masui, Yu-Chen Shen, Danielle Russell Chamberlin, Peter Josef Schmidt
-
Publication number: 20200335672Abstract: A wavelength converting layer is partially diced to generate a first and second wavelength converting layer segment and to allow partial isolation between the first segment and the second segment such that the wavelength converting layer segments are connected by a connecting wavelength converting layer. The first and second wavelength converting layer segments are attached to a first and second light emitting device, respectively to create a first and second pixel. The connecting wavelength converting layer segment is removed to allow complete isolation between the first pixel and the second pixel. An optical isolation material is applied to exposed surfaces of the first and second pixel and a sacrificial portion of the wavelength converting layer segments and optical isolation material attached to the sacrificial portion is removed from a surface facing away from the first light emitting device, to expose a emitting surface of the first wavelength converting layer segment.Type: ApplicationFiled: June 30, 2020Publication date: October 22, 2020Applicant: LUMILEDS LLCInventors: Kentaro SHIMIZU, Hisashi MASUI, Yu-Chen SHEN, Danielle Russell CHAMBERLIN, Peter Josef SCHMIDT