Patents by Inventor Shibu Abraham
Shibu Abraham 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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Publication number: 20240142695Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs and Bragg gratings, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated Bragg gratings (EBGs). EBGs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) grating. Removing the liquid crystal from the cured grating provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.Type: ApplicationFiled: January 8, 2024Publication date: May 2, 2024Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham, Baeddan George Hill, Tsung-Jui Ho
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Patent number: 11899238Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs and Bragg gratings, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated Bragg gratings (EBGs). EBGs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) grating. Removing the liquid crystal from the cured grating provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.Type: GrantFiled: September 12, 2022Date of Patent: February 13, 2024Assignee: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham, Baeddan George Hill, Tsung-Jui Ho
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Publication number: 20240027670Abstract: Disclosed herein are various implementations display devices including phonic crystals. One embodiment includes a heads-up display including: a picture generation unit for projecting collimated light over a field of view; a first waveguide comprising an input grating for coupling the light from the picture generation unit into a total internal reflection path in the first waveguide and an output grating for providing beam expansion and light extraction from the first waveguide; a curved transparent substrate; and a mirror disposed with its reflecting surface facing a waveguide output surface of the first waveguide. The mirror may be configured to reflect light extracted from the first waveguide back through the first waveguide towards the curved transparent substrate. The first waveguide may be configured such that the curved transparent substrate reflects light extracted from the first waveguide towards an eyebox forming a virtual image viewable through the transparent curved substrate from the eyebox.Type: ApplicationFiled: November 22, 2021Publication date: January 25, 2024Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham
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Publication number: 20230266512Abstract: Disclosed herein is a holographic mixture including nanoparticles used to form gratings through holographic exposure. In various embodiments, exposure of the holographic mixture causes the nanoparticles to diffuse to dark fringe regions which creates nanoparticle rich regions and nanoparticle poor regions. Some embodiments include a multi-layer grating which includes a layer formed through the exposed holographic mixture and another layer directly applied above the exposed holographic mixture. The other layer may also be exposed through a holographic recording beam.Type: ApplicationFiled: July 14, 2021Publication date: August 24, 2023Applicant: DigiLens Inc.Inventors: Gerald Buxton, Shibu Abraham, Richard E. Bergstrom, Jr., Alastair John Grant, Tsung-Jui Ho, Baeddan George Hill, Michiel Koen Callens, Hua Gu
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Publication number: 20230078253Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs and Bragg gratings, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated Bragg gratings (EBGs). EBGs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) grating. Removing the liquid crystal from the cured grating provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.Type: ApplicationFiled: September 12, 2022Publication date: March 16, 2023Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham, Baeddan George Hill, Tsung-Jui Ho
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Patent number: 11592614Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs and Bragg gratings, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated Bragg gratings (EBGs). EBGs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) grating. Removing the liquid crystal from the cured grating provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.Type: GrantFiled: January 20, 2022Date of Patent: February 28, 2023Assignee: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham, Baeddan George Hill, Tsung-Jui Ho
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Patent number: 11442222Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs and Bragg gratings, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated Bragg gratings (EBGs). EBGs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) grating. Removing the liquid crystal from the cured grating provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.Type: GrantFiled: August 28, 2020Date of Patent: September 13, 2022Assignee: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham, Baeddan George Hill, Tsung-Jui Ho
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Publication number: 20220283378Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated periodic structures (EPSs). EPSs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) periodic structure. Removing the liquid crystal from the cured periodic structure provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.Type: ApplicationFiled: May 13, 2022Publication date: September 8, 2022Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham, Baeddan George Hill, Tsung-Jui Ho, Michiel Koen Callens, Hyesog Lee
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Publication number: 20220283376Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated periodic structures (EPSs). EPSs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) periodic structure. Removing the liquid crystal from the cured periodic structure provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.Type: ApplicationFiled: March 7, 2022Publication date: September 8, 2022Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham, Baeddan George Hill, Tsung-Jui Ho, Michiel Koen Callens, Hyesog Lee
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Publication number: 20220155623Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs and Bragg gratings, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated Bragg gratings (EBGs). EBGs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) grating. Removing the liquid crystal from the cured grating provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.Type: ApplicationFiled: January 20, 2022Publication date: May 19, 2022Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham, Baeddan George Hill, Tsung-Jui Ho
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Publication number: 20210223585Abstract: Systems for the manufacturing of waveguide cells in accordance with various embodiments can be configured and implemented in many different ways. In many embodiments, various deposition mechanisms are used to deposit layer(s) of optical recording material onto a transparent substrate. A second transparent substrate can be provided, and the three layers can be laminated to form a waveguide cell. Suitable optical recording material can vary widely depending on the given application. In some embodiments, the optical recording material deposited has a similar composition throughout the layer. In a number of embodiments, the optical recording material spatially varies in composition, allowing for the formation of optical elements with varying characteristics. Regardless of the composition of the optical recording material, any method of placing or depositing the optical recording material onto a substrate can be utilized.Type: ApplicationFiled: December 29, 2020Publication date: July 22, 2021Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Ratson Morad, Alastair John Grant, Sihui He, Shibu Abraham, Milan Momcilo Popovich
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Patent number: 11061837Abstract: In an aspect of the disclosure, an apparatus, a computer-readable medium, and a method are provided. The apparatus may be a service processor. The service processor receives, a first command or data of a UBM protocol from a UBM host running on a host of the service processor. The UBM protocol is a first protocol supported by the service processor. The first command or data instructs a backplane controller of the host to perform a first task. The service processor generates a second command or data of a second protocol supported by the service processor. The second command or data instructs the backplane controller to perform the first task. The service processor sends the second command or data to the backplane controller.Type: GrantFiled: August 21, 2019Date of Patent: July 13, 2021Assignee: AMERICAN MEGATRENDS INTERNATIONAL, LLCInventors: Timothy Bouda, Umasankar Mondal, Shibu Abraham
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Publication number: 20210063634Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs and Bragg gratings, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated Bragg gratings (EBGs). EBGs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) grating. Removing the liquid crystal from the cured grating provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.Type: ApplicationFiled: August 28, 2020Publication date: March 4, 2021Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Alastair John Grant, Milan Momcilo Popovich, Shibu Abraham, Baeddan George Hill
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Publication number: 20200271973Abstract: Holographic polymer dispersed liquid crystal material systems in accordance with various embodiments of the invention are illustrated. One embodiment includes a holographic polymer dispersed liquid crystal formulation, including monomers, photoinitiators, and a liquid crystal mixture including terphenyl compounds and non-terphenyl compounds, the liquid crystal mixture having a ratio of at least 1:10 by weight percentage of the terphenyl compounds to the non-terphenyl compounds, wherein the photoinitiators are configured to facilitate a photopolymerization induced phase separation process of the monomers and the liquid crystal mixture. In another embodiment, the liquid crystal mixture further includes pyrimidine compounds, and wherein the liquid crystal mixture has a ratio of at least 1:10 by weight percentage of the terphenyl compounds and pyrimidine compounds to the non-terphenyl compounds. In a further embodiment, the ratio of the terphenyl compounds to the non-terphenyl compounds is at least 1.5:10.Type: ApplicationFiled: February 24, 2020Publication date: August 27, 2020Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Shibu Abraham
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Publication number: 20200247017Abstract: Systems and methods for compensating for nonuniform surface topography features in accordance with various embodiments of the invention are illustrated. One embodiment includes a method for manufacturing waveguide cells, the method including providing a waveguide including first and second substrates and a layer of optical recording material, and applying a surface forming process to at least one external surface of the first and second substrates. In another embodiment, applying the surface forming process includes applying a forming material coating to the at least one external surface, providing a forming element having a forming surface, bringing the forming element in physical contact with the forming material coating, curing the forming material coating while it is in contact with the forming element, and releasing the forming material coating from the forming element.Type: ApplicationFiled: February 5, 2020Publication date: August 6, 2020Applicant: DigiLens Inc.Inventors: Jonathan David Waldern, Shibu Abraham, Milan Momcilo Popovich
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Publication number: 20200065273Abstract: In an aspect of the disclosure, an apparatus, a computer-readable medium, and a method are provided. The apparatus may be a service processor. The service processor receives, a first command or data of a UBM protocol from a UBM host running on a host of the service processor. The UBM protocol is a first protocol supported by the service processor. The first command or data instructs a backplane controller of the host to perform a first task. The service processor generates a second command or data of a second protocol supported by the service processor. The second command or data instructs the backplane controller to perform the first task. The service processor sends the second command or data to the backplane controller.Type: ApplicationFiled: August 21, 2019Publication date: February 27, 2020Inventors: Timothy Bouda, Umasankar Mondal, Shibu Abraham
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Publication number: 20190212597Abstract: Photopolymerizable materials and in particular holographic polymer dispersed liquid crystal materials and processes for fabricating holographic waveguide devices from such materials are provided. Materials and formulations of photopolymerizable materials are sufficiently low haze to allow for the omission of adhesives from within the cell of the holographic waveguide devices. The photopolymerizable materials are used in association with methods of manufacturing holographic waveguides such that photopolymerizable materials may be used as an adhesive material.Type: ApplicationFiled: January 8, 2019Publication date: July 11, 2019Applicant: DigiLens, Inc.Inventors: Jonathan David Waldern, Shibu Abraham
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Publication number: 20190212589Abstract: Photopolymerizable materials and in particular holographic polymer dispersed liquid crystal materials and processes for fabricating holographic waveguide devices from such materials are provided. Materials and formulations of photopolymerizable materials incorporate a mixture of LCs and monomer (and other components including: photoinitiator dye, coinitiators, surfactant), which under holographic exposure undergo phase separation to provide a grating in which at least one of the LCs and at least one of the monomers forms a first HPDLC morphology that provides a P polarization response and at least one of the LCs and at least one of the monomers forms a second HPDLC morphology that provides a S polarization response.Type: ApplicationFiled: January 8, 2019Publication date: July 11, 2019Applicant: DigiLens, Inc.Inventors: Jonathan David Waldern, Shibu Abraham
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Publication number: 20190212596Abstract: HPDLC material systems can be formulated in many different ways depending on the application. The HPDLC formulation can include a reactive monomer liquid crystal mixture (“RMLCM”). An RMLCM can include monomer acrylates, multi-functional acrylates, a cross-linking agent, a photo-initiator, and a liquid crystal (“LC”). The mixture (often referred to as syrup) frequently also includes a surfactant. One embodiment includes a reactive monomer liquid crystal mixture material including at least one liquid crystal, a photoinitiator dye, a coinitiators, and photopolymerizable monomers including at least one mono-functional monomer and at least one bi-functional monomer. In some embodiment, the bi-functional monomers accounts for at least 10 weight percent of the reactive monomer liquid crystal mixture material and the at least one mono-functional monomer accounts for at least 30 percent of the reactive monomer liquid crystal mixture material.Type: ApplicationFiled: June 13, 2018Publication date: July 11, 2019Applicant: DigiLens, Inc.Inventors: Jonathan David Waldern, Shibu Abraham
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Publication number: 20190212588Abstract: Systems for the manufacturing of waveguide cells in accordance with various embodiments can be configured and implemented in many different ways. In many embodiments, various deposition mechanisms are used to deposit layer(s) of optical recording material onto a transparent substrate. A second transparent substrate can be provided, and the three layers can be laminated to form a waveguide cell. Suitable optical recording material can vary widely depending on the given application. In some embodiments, the optical recording material deposited has a similar composition throughout the layer. In a number of embodiments, the optical recording material spatially varies in composition, allowing for the formation of optical elements with varying characteristics. Regardless of the composition of the optical recording material, any method of placing or depositing the optical recording material onto a substrate can be utilized.Type: ApplicationFiled: November 28, 2018Publication date: July 11, 2019Applicant: DigiLens, Inc.Inventors: Jonathan David Waldern, Ratson Morad, Alastair John Grant, Sihui He, Shibu Abraham, Milan Momcilo Popovich