Patents by Inventor Venkata Ananth TAMMA
Venkata Ananth TAMMA 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: 11508888Abstract: A light-emitting device assembly includes an emitter array of light-emitting elements, a transparent substrate, a structured lens, and an angular filter. The emitter array emits from its emission surface output light that is transmitted through the substrate, and enables selective activation of and emission from individual elements or subsets of elements of the array. The structured lens is formed on or in the substrate, and comprises micro- or nano-structured elements resulting in an effective focal length less than an effective distance between the structured lens and the emission surface. The angular filter is positioned on or in the substrate or on the emission surface and exhibits decreasing transmission or a cutoff angle with increasing angle of incidence.Type: GrantFiled: December 20, 2021Date of Patent: November 22, 2022Assignee: Lumileds LLCInventors: Toni Lopez, Venkata Ananth Tamma
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Publication number: 20220344545Abstract: A light emitting device comprises a semiconductor diode structure configured to emit light, a substrate that is transparent to light emitted by the semiconductor diode structure, and a reflective nanostructured layer. The reflective nanostructured layer may be disposed on or adjacent to a bottom surface of the substrate and configured to reflect toward and through a side wall surface of the substrate light that is emitted by the semiconductor structure and incident on the reflective nanostructured layer at angles at or near perpendicular incidence. Alternatively, the reflective nanostructured layer may be disposed on or adjacent to at least one sidewall surface of the substrate and configured to reflect toward and through the bottom surface of the substrate light that is emitted by the semiconductor structure and incident on the reflective nanostructured layer at angles at or near perpendicular incidence.Type: ApplicationFiled: July 12, 2022Publication date: October 27, 2022Applicant: Lumileds LLCInventor: Venkata Ananth TAMMA
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Patent number: 11480315Abstract: 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: GrantFiled: June 30, 2021Date of Patent: October 25, 2022Assignee: Lumileds LLCInventors: Kentaro Shimizu, Venkata Ananth Tamma, Hisashi Masui
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Patent number: 11430919Abstract: A light emitting device comprises a semiconductor diode structure configured to emit light, a substrate that is transparent to light emitted by the semiconductor diode structure, and a reflective nanostructured layer. The reflective nanostructured layer may be disposed on or adjacent to a bottom surface of the substrate and configured to reflect toward and through a side wall surface of the substrate light that is emitted by the semiconductor structure and incident on the reflective nanostructured layer at angles at or near perpendicular incidence. Alternatively, the reflective nanostructured layer may be disposed on or adjacent to at least one sidewall surface of the substrate and configured to reflect toward and through the bottom surface of the substrate light that is emitted by the semiconductor structure and incident on the reflective nanostructured layer at angles at or near perpendicular incidence.Type: GrantFiled: April 23, 2020Date of Patent: August 30, 2022Assignee: Lumileds LLCInventor: Venkata Ananth Tamma
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Publication number: 20220271206Abstract: A light-emitting device assembly includes an emitter array of light-emitting elements, a transparent substrate, a structured lens, and an angular filter. The emitter array emits from its emission surface output light that is transmitted through the substrate, and enables selective activation of and emission from individual elements or subsets of elements of the array. The structured lens is formed on or in the substrate, and comprises micro- or nano-structured elements resulting in an effective focal length less than an effective distance between the structured lens and the emission surface. The angular filter is positioned on or in the substrate or on the emission surface and exhibits decreasing transmission or a cutoff angle with increasing angle of incidence.Type: ApplicationFiled: December 20, 2021Publication date: August 25, 2022Applicant: Lumileds LLCInventors: Toni Lopez, Venkata Ananth Tamma
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Publication number: 20220260817Abstract: 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: May 6, 2022Publication date: August 18, 2022Applicant: LUMILEDS LLCInventor: Venkata Ananth TAMMA
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Publication number: 20220254967Abstract: A nano-structure layer is disclosed. The nano-structure layer includes an array of nano-structure material configured to receive a first light beam at a first angle of incidence and to emit the first light beam at a second angle greater than the first angle, the nano-structure material each having a largest dimension of less than 1000 nm.Type: ApplicationFiled: April 27, 2022Publication date: August 11, 2022Applicant: Lumileds LLCInventors: Antonio Lopez-Julia, Venkata Ananth TAMMA
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Publication number: 20220146079Abstract: An adaptive lighting system comprises an array of independently controllable LEDs, and a metalens positioned to collimate, focus, or otherwise redirect light emitted by the array of LEDs. The adaptive lighting system may optionally include a pre-collimator positioned in the optical path between the array of LEDs and the metalens.Type: ApplicationFiled: November 12, 2020Publication date: May 12, 2022Applicant: Lumileds LLCInventors: Venkata Ananth TAMMA, Toni LOPEZ, Nicola Bettina PFEFFER, Marcel Rene BOHMER
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Patent number: 11327283Abstract: 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: GrantFiled: May 3, 2021Date of Patent: May 10, 2022Assignee: Lumileds LLCInventor: Venkata Ananth Tamma
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Patent number: 11322669Abstract: A nano-structure layer is disclosed. The nano-structure layer includes an array of nano-structure material configured to receive a first light beam at a first angle of incidence and to emit the first light beam at a second angle greater than the first angle, the nano-structure material each having a largest dimension of less than 1000 nm.Type: GrantFiled: December 21, 2018Date of Patent: May 3, 2022Assignee: Lumileds LLCInventors: Antonio Lopez-Julia, Venkata Ananth Tamma
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Publication number: 20220082742Abstract: A nano-structure layer is disclosed. The nano-structure layer includes a plurality of nano-photonic structures that are configured in a first configuration such that light incident upon the nanostructured layer below a cut-off angle passes through the nanostructured layer and light incident upon the nanostructured layer above the cut-off angle is reflected back in direction of the incidence.Type: ApplicationFiled: December 20, 2019Publication date: March 17, 2022Applicant: LUMILEDS LLCInventors: Antonio Lopez-Julia, Venkata Ananth Tamma
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Patent number: 11268676Abstract: A light-emitting device assembly includes a concave optical collector, a light-emitting device, and a light-escape surface. The collector redirects incident light by reflection, scattering, or reradiation. The light-emitting device emits device output light to propagate within the optical collector. The light-escape surface extends across an open end of the collector and exhibits (i) incidence-angle-dependent transmission of light that decreases with increasing incidence angle, or (ii) transmissive redirection of light to propagate at an angle less than a corresponding refracted angle, that are imparted by an array of nano-antennae, a partial photonic bandgap structure, a photonic crystal, an array of meta-atoms or meta-molecules, or a multi-layer dielectric thin film.Type: GrantFiled: December 11, 2020Date of Patent: March 8, 2022Assignee: Lumileds LLCInventors: Antonio Lopez-Julia, Venkata Ananth Tamma
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Patent number: 11217731Abstract: An adhesive layer is disclosed and may include a plurality of short chain molecules, each of the plurality of the short chain molecules including a first end and a second end such that the distance between the first end and second end is less than 100 nm and such that first end is configured to attach to a first surface and the second end is configured to attach to a second surface.Type: GrantFiled: August 28, 2020Date of Patent: January 4, 2022Assignee: Lumileds LLCInventors: Venkata Ananth Tamma, Kentaro Shimizu, Vernon K. Wong
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Patent number: 11204153Abstract: A light-emitting device assembly includes a concave optical collector with a cavity, an emitter array of light-emitting elements, a transparent substrate across an open end of the collector, a structured lens, and an angular filter. The emitter array is positioned within the package cavity and emits from its emission surface output light that exits the cavity from the open its end through the substrate, and enables selective activation of and emission from individual elements of the array. The structured lens is formed on or in the substrate, and comprises micro- or nano-structured elements resulting in an effective focal length less than an effective distance between the structured lens and the emission surface. The angular filter is positioned on or in the substrate or on the emission surface and exhibits decreasing transmission or a cutoff angle with increasing angle of incidence.Type: GrantFiled: February 22, 2021Date of Patent: December 21, 2021Assignee: Lumileds LLCInventors: Toni Lopez, Venkata Ananth Tamma
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Publication number: 20210356726Abstract: 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: May 3, 2021Publication date: November 18, 2021Applicant: LUMILEDS LLCInventor: Venkata Ananth Tamma
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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
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Publication number: 20210328101Abstract: 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: April 30, 2021Publication date: October 21, 2021Applicant: Lumileds LLCInventors: Toni Lopez, Venkata Ananth Tamma
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Publication number: 20210296539Abstract: 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: May 26, 2021Publication date: September 23, 2021Applicant: LUMILEDS LLCInventors: Venkata Ananth TAMMA, Toni LOPEZ
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Publication number: 20210285625Abstract: A light-emitting device assembly includes a concave optical collector, a light-emitting device, and a light-escape surface. The collector redirects incident light by reflection, scattering, or reradiation. The light-emitting device emits device output light to propagate within the optical collector. The light-escape surface extends across an open end of the collector and exhibits (i) incidence-angle-dependent transmission of light that decreases with increasing incidence angle, or (ii) transmissive redirection of light to propagate at an angle less than a corresponding refracted angle, that are imparted by an array of nano-antennae, a partial photonic bandgap structure, a photonic crystal, an array of meta-atoms or meta-molecules, or a multi-layer dielectric thin film.Type: ApplicationFiled: December 11, 2020Publication date: September 16, 2021Applicant: LUMILEDS LLCInventors: Antonio LOPEZ-JULIA, Venkata Ananth TAMMA
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Publication number: 20210234075Abstract: A device comprising a light emitting diode (LED) substrate, and a meta-molecule wavelength converting layer positioned within an emitted light path from the LED substrate, the a meta-molecule wavelength converting layer including a plurality of nanoparticles, the plurality of nanoparticles configured to increase a light path length in the wavelength converting layer.Type: ApplicationFiled: March 25, 2021Publication date: July 29, 2021Applicant: LUMILEDS LLCInventors: Venkata Ananth Tamma, Antonio Lopez-Julia