Patents by Inventor Anusha Pokhriyal
Anusha Pokhriyal 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: 11605754Abstract: A transfer method includes providing a first light emitting diode on a first substrate, performing a partial laser liftoff of the first light emitting diode from the first substrate, laser bonding the first light emitting diode to the backplane after performing the partial laser liftoff, and separating the first substrate from the first light emitting diode after the laser bonding.Type: GrantFiled: December 9, 2020Date of Patent: March 14, 2023Assignee: NANOSYS, INC.Inventors: Timothy Gallagher, Anusha Pokhriyal
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Publication number: 20210359186Abstract: A method includes transferring a first subset of the first LEDs from a first substrate to a first backplane to form first subpixels in pixel regions, transferring a first subset of the second LEDs to a second backplane and separating the first subset of the second LEDs from a second substrate to leave first vacancies on the second substrate, forming an additional electrically conductive material on a second subset of second LEDs located on the second substrate after transferring the first subset of the second LEDs to the second backplane, positioning the second substrate over the first backplane, such that the first subpixels are disposed in the first vacancies, and transferring the second subset of the second LEDs to a second subset of bonding structures on the first backplane to form second subpixels in the pixel regions, while a gap exists between the first subpixels and the second substrate.Type: ApplicationFiled: May 11, 2021Publication date: November 18, 2021Inventors: Saket CHADDA, Anusha POKHRIYAL, Zulal Tezcan OZEL
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Publication number: 20210184072Abstract: A transfer method includes providing a first light emitting diode on a first substrate, performing a partial laser liftoff of the first light emitting diode from the first substrate, laser bonding the first light emitting diode to the backplane after performing the partial laser liftoff, and separating the first substrate from the first light emitting diode after the laser bonding.Type: ApplicationFiled: December 9, 2020Publication date: June 17, 2021Inventors: Timothy GALLAGHER, Anusha POKHRIYAL
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Method of selectively transferring LED die to a backplane using height controlled bonding structures
Patent number: 10714464Abstract: Selective transfer of dies including semiconductor devices to a target substrate can be performed employing local laser irradiation. Coining of at least one set of solder material portions can be employed to provide a planar surface-to-surface contact and to facilitate bonding of adjoining pairs of bond structures. Laser irradiation on the solder material portions can be employed to sequentially bond selected pairs of mated bonding structures, while preventing bonding of devices not to be transferred to the target substrate. Additional laser irradiation can be employed to selectively detach bonded devices, while not detaching devices that are not bonded to the target substrate. The transferred devices can be pressed against the target substrate during a second reflow process so that the top surfaces of the transferred devices can be coplanar. Wetting layers of different sizes can be employed to provide a trapezoidal vertical cross-sectional profile for reflowed solder material portions.Type: GrantFiled: February 14, 2017Date of Patent: July 14, 2020Assignee: GLO ABInventors: Anusha Pokhriyal, Sharon N. Farrens, Timothy Gallagher -
Patent number: 10707190Abstract: A backplane can have a non-planar top surface. Insulating material portions including planar top surface regions located within a same horizontal plane are formed over the backplane. A two-dimensional array of metal plate clusters is formed over the insulating material portions. Each of the metal plate clusters includes a plurality of metal plates. Each metal plate includes a horizontal metal plate portion overlying a planar top surface region and a connection metal portion connected to a respective metal interconnect structure in the backplane. A two-dimensional array of light emitting device clusters is bonded to the backplane through respective bonding structures. Each light emitting device cluster includes a plurality of light emitting devices overlying a respective metal plate cluster.Type: GrantFiled: April 10, 2018Date of Patent: July 7, 2020Assignee: GLO ABInventors: Tsun Lau, Fariba Danesh, Timothy Gallagher, Anusha Pokhriyal
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Patent number: 10693051Abstract: Light emitting devices can be disposed on the front side of a transparent backplane. A laser beam can be irradiated through the transparent backplane and onto a component located on the front side of the transparent backplane. In one embodiment, the component may be a solder material portion that is reflowed to bond the light emitting devices to the transparent backplane. In another embodiment, the component may be a solder material bonded to a defective bonded light emitting device. In this case, the laser irradiation can reflow the solder material to dissociate the defective bonded light emitting device from the transparent backplane. In yet another embodiment, the component may be a device component that is electrically modified by the laser irradiation.Type: GrantFiled: January 18, 2019Date of Patent: June 23, 2020Assignee: GLO ABInventors: Sharon N. Farrens, Anusha Pokhriyal
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Patent number: 10553571Abstract: Backplane-side bonding structures including a common metal are formed on a backplane. Multiple source coupons are provided such that each source coupon includes a transfer substrate and an array of devices to be transferred. Each array of devices are arranged such that each array includes a unit cell structure including multiple devices of the same type and different types of bonding structures including different metals that provide different eutectic temperatures with the common metal. Different types of devices can be sequentially transferred to the backplane by sequentially applying the supply coupons and selecting devices providing progressively higher eutectic temperatures between respective bonding pads and the backplane-side bonding structures. Previously transferred devices stay on the backplane during subsequent transfer processes, enabling formation of arrays of different devices on the backplane.Type: GrantFiled: January 4, 2018Date of Patent: February 4, 2020Assignee: GLO ABInventors: Anusha Pokhriyal, Sharon N. Farrens
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Publication number: 20190312015Abstract: A backplane can have a non-planar top surface. Insulating material portions including planar top surface regions located within a same horizontal plane are formed over the backplane. A two- dimensional array of metal plate clusters is formed over the insulating material portions. Each of the metal plate clusters includes a plurality of metal plates. Each metal plate includes a horizontal metal plate portion overlying a planar top surface region and a connection metal portion connected to a respective metal interconnect structure in the backplane. A two- dimensional array of light emitting device clusters is bonded to the backplane through respective bonding structures. Each light emitting device cluster includes a plurality of light emitting devices overlying a respective metal plate cluster.Type: ApplicationFiled: April 10, 2018Publication date: October 10, 2019Inventors: Tsun LAU, Fariba DANESH, Timothy Gallagher, Anusha Pokhriyal
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Patent number: 10304810Abstract: A backplane optionally having stepped horizontal surfaces and optionally embedding metal interconnect structures is provided. First conductive bonding structures are formed on first stepped horizontal surfaces. First light emitting devices on a first transfer substrate are disposed on the first conductive bonding structures, and a first subset of the first light emitting devices is bonded to the first conductive bonding structures. Laser irradiation can be employed to selectively disconnect the first subset of the first light emitting devices from the first transfer substrate while a second subset of the first light emitting devices remains attached to the first transfer substrate.Type: GrantFiled: December 17, 2015Date of Patent: May 28, 2019Assignee: GLO ABInventors: Nathan Gardner, Fredrick A. Kish, Jr., Miljenko Modric, Anusha Pokhriyal, Daniel Thompson, Fariba Danesh
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Publication number: 20190157533Abstract: Light emitting devices can be disposed on the front side of a transparent backplane. A laser beam can be irradiated through the transparent backplane and onto a component located on the front side of the transparent backplane. In one embodiment, the component may be a solder material portion that is reflowed to bond the light emitting devices to the transparent backplane. In another embodiment, the component may be a solder material bonded to a defective bonded light emitting device. In this case, the laser irradiation can reflow the solder material to dissociate the defective bonded light emitting device from the transparent backplane. In yet another embodiment, the component may be a device component that is electrically modified by the laser irradiation.Type: ApplicationFiled: January 18, 2019Publication date: May 23, 2019Inventors: Sharon N. Farrens, Anusha Pokhriyal
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Patent number: 10205075Abstract: A light emitting device and method of forming the same, the light emitting device including: a substrate, a buffer layer disposed on the substrate, a semiconductor mesa disposed on the buffer layer and including a first semiconductor layer, a light emitting active layer disposed on the first semiconductor layer, and a second semiconductor layer disposed on the first semiconductor layer, a contact layer disposed on an upper surface of the mesa, a passivation layer covering sidewalls of the mesa and the contact layer, and a cap structure including a reflective layer covering an upper surface of the contact layer, and a solder layer including a recess in which the reflective layer is disposed.Type: GrantFiled: November 29, 2017Date of Patent: February 12, 2019Assignee: GLO ABInventors: Anusha Pokhriyal, Mariana Munteanu, Fariba Danesh
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Patent number: 10193038Abstract: Light emitting devices can be disposed on the front side of a transparent backplane. A laser beam can be irradiated through the transparent backplane and onto a component located on the front side of the transparent backplane. In one embodiment, the component may be a solder material portion that is reflowed to bond the light emitting devices to the transparent backplane. In another embodiment, the component may be a solder material bonded to a defective bonded light emitting device. In this case, the laser irradiation can reflow the solder material to dissociate the defective bonded light emitting device from the transparent backplane. In yet another embodiment, the component may be a device component that is electrically modified by the laser irradiation.Type: GrantFiled: March 20, 2017Date of Patent: January 29, 2019Assignee: GLO ABInventors: Sharon N. Farrens, Anusha Pokhriyal
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Patent number: 10177123Abstract: A backplane optionally having stepped horizontal surfaces and optionally embedding metal interconnect structures is provided. First conductive bonding structures are formed on first stepped horizontal surfaces. First light emitting devices on a first transfer substrate are disposed on the first conductive bonding structures, and a first subset of the first light emitting devices is bonded to the first conductive bonding structures. Laser irradiation can be employed to selectively disconnect the first subset of the first light emitting devices from the first transfer substrate while a second subset of the first light emitting devices remains attached to the first transfer substrate.Type: GrantFiled: December 17, 2015Date of Patent: January 8, 2019Assignee: GLO ABInventors: Nathan Gardner, Fredrick A. Kish, Jr., Miljenko Modric, Anusha Pokhriyal, Daniel Bryce Thompson, Fariba Danesh, Sharon N. Farrens
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Publication number: 20180366450Abstract: A backplane optionally having stepped horizontal surfaces and optionally embedding metal interconnect structures is provided. First conductive bonding structures are formed on first stepped horizontal surfaces. First light emitting devices on a first transfer substrate are disposed on the first conductive bonding structures, and a first subset of the first light emitting devices is bonded to the first conductive bonding structures. Laser irradiation can be employed to selectively disconnect the first subset of the first light emitting devices from the first transfer substrate while a second subset of the first light emitting devices remains attached to the first transfer substrate.Type: ApplicationFiled: December 17, 2015Publication date: December 20, 2018Inventors: Nathan GARDNER, Fredrick A. KISH JR., Miljenko MODRIC, Anusha POKHRIYAL, Daniel THOMPSON, Fariba DANESH
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Publication number: 20180159005Abstract: A light emitting device and method of forming the same, the light emitting device including: a substrate, a buffer layer disposed on the substrate, a semiconductor mesa disposed on the buffer layer and including a first semiconductor layer, a light emitting active layer disposed on the first semiconductor layer, and a second semiconductor layer disposed on the first semiconductor layer, a contact layer disposed on an upper surface of the mesa, a passivation layer covering sidewalls of the mesa and the contact layer, and a cap structure including a reflective layer covering an upper surface of the contact layer, and a solder layer including a recess in which the reflective layer is disposed.Type: ApplicationFiled: November 29, 2017Publication date: June 7, 2018Inventors: Anusha POKHRIYAL, Mariana MUNTEANU, Fariba DANESH
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Publication number: 20180130779Abstract: Backplane-side bonding structures including a common metal are formed on a backplane. Multiple source coupons are provided such that each source coupon includes a transfer substrate and an array of devices to be transferred. Each array of devices are arranged such that each array includes a unit cell structure including multiple devices of the same type and different types of bonding structures including different metals that provide different eutectic temperatures with the common metal. Different types of devices can be sequentially transferred to the backplane by sequentially applying the supply coupons and selecting devices providing progressively higher eutectic temperatures between respective bonding pads and the backplane-side bonding structures. Previously transferred devices stay on the backplane during subsequent transfer processes, enabling formation of arrays of different devices on the backplane.Type: ApplicationFiled: January 4, 2018Publication date: May 10, 2018Inventors: Anusha Pokhriyal, Sharon N. Farrens
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Patent number: 9893041Abstract: Backplane-side bonding structures including a common metal are formed on a backplane. Multiple source coupons are provided such that each source coupon includes a transfer substrate and an array of devices to be transferred. Each array of devices are arranged such that each array includes a unit cell structure including multiple devices of the same type and different types of bonding structures including different metals that provide different eutectic temperatures with the common metal. Different types of devices can be sequentially transferred to the backplane by sequentially applying the supply coupons and selecting devices providing progressively higher eutectic temperatures between respective bonding pads and the backplane-side bonding structures. Previously transferred devices stay on the backplane during subsequent transfer processes, enabling formation of arrays of different devices on the backplane.Type: GrantFiled: April 12, 2017Date of Patent: February 13, 2018Assignee: GLO ABInventors: Anusha Pokhriyal, Sharon N. Farrens
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Publication number: 20170373046Abstract: A backplane optionally having stepped horizontal surfaces and optionally embedding metal interconnect structures is provided. First conductive bonding structures are formed on first stepped horizontal surfaces. First light emitting devices on a first transfer substrate are disposed on the first conductive bonding structures, and a first subset of the first light emitting devices is bonded to the first conductive bonding structures. Laser irradiation can be employed to selectively disconnect the first subset of the first light emitting devices from the first transfer substrate while a second subset of the first light emitting devices remains attached to the first transfer substrate.Type: ApplicationFiled: December 17, 2015Publication date: December 28, 2017Inventors: Nathan GARDNER, Fredrick A. KISH JR., Miljenko MODRIC, Anusha POKHRIYAL, Daniel Bryce THOMPSON, Fariba DANESH, Sharon N. FARRENS
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Publication number: 20170301660Abstract: Backplane-side bonding structures including a common metal are formed on a backplane. Multiple source coupons are provided such that each source coupon includes a transfer substrate and an array of devices to be transferred. Each array of devices are arranged such that each array includes a unit cell structure including multiple devices of the same type and different types of bonding structures including different metals that provide different eutectic temperatures with the common metal. Different types of devices can be sequentially transferred to the backplane by sequentially applying the supply coupons and selecting devices providing progressively higher eutectic temperatures between respective bonding pads and the backplane-side bonding structures. Previously transferred devices stay on the backplane during subsequent transfer processes, enabling formation of arrays of different devices on the backplane.Type: ApplicationFiled: April 12, 2017Publication date: October 19, 2017Inventors: Anusha POKHRIYAL, Sharon N. FARRENS
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Publication number: 20170288102Abstract: Light emitting devices can be disposed on the front side of a transparent backplane. A laser beam can be irradiated through the transparent backplane and onto a component located on the front side of the transparent backplane. In one embodiment, the component may be a solder material portion that is reflowed to bond the light emitting devices to the transparent backplane. In another embodiment, the component may be a solder material bonded to a defective bonded light emitting device. In this case, the laser irradiation can reflow the solder material to dissociate the defective bonded light emitting device from the transparent backplane. In yet another embodiment, the component may be a device component that is electrically modified by the laser irradiation.Type: ApplicationFiled: March 20, 2017Publication date: October 5, 2017Inventors: Sharon N. FARRENS, Anusha POKHRIYAL