Hewlett-packard Development Company, L.p.

Applied Materials, Inc.

Purdue Research Foundation

United States of America As Represented by the Administrator of Nasa

Hou Tee Ng

Sivapackia Ganapathiappan

Nag B Patibandla

Howard S Tom

Krzysztof Nauka

Daihua Zhang

Yan Zhao

Yingdong Luo

Albert Teishev

Doris Pik-Yiu Chun

Rajeev Bajaj

Daniel Redfield

Mingwei Zhu

Lihua Zhao

Raanan Y Zehavi

Boyi Fu

Ajey M Joshi

Ashwin Chockalingam

Mayu Felicia Yamamura

Jason Garcheung Fung

Ashavani Kumar

Kasiraman Krishnan

Eric Ng

Mahendra Christopher Orilall

Manoj K Bhattacharyya

Alejandro Manuel De Pena

Bernard Frey

Bharath Swaminathan

Doris Chun

Byung Sung Kwak

Jeffrey L Franklin

Lisong Xu

Zhang-Lin Zhou

Han-Wen Chen

Kyuil Cho

Mario Dagio Cornejo

Fred Conrad Redeker

Alfred I-Tsung Pan

Scott T Haubrich

Yoocharn Jeon

Gregory E Menk

Robert E Davenport

Alfred I Pan

Aniruddh Jagdish Khanna

Veera Raghava Reddy Kakireddy

Kashif Maqsood

Venkat Hariharan

Amritanshu Sinha

Sudhakar Madhusoodhanan

Alexander N Govyadinov

Vladek P Kasperchik

Thomas C Anthony

Christopher Dennis Bencher

Henryk Birecki

Ali Emamjomeh

Ron Naftali

James Elmer Abbott, Jr

Jayprakash C Bhatt

Esteve Comas

Christopher G Talbot

Laurie S Mittelstadt

Xia Sheng

Edward Dale Davis

Quang P Lam

Uma Sridhar

Wenjia Zhang

Kartik Ramaswamy

Srinivas D Nemani

Jennifer Y Sun

Omer Gila

Anantha K Subramani

Thomas B Brezoczky

Keshava A Prasad

Ankit Vora

Meyya Meyyappan

Simon Yavelberg

Swaminathan T Srinivasan

Eric Hoarau

David Masayuki Ishikawa

Zihao Yang

Christopher A Rowland

Sumedh Acharya

Giorgio Cellere

Sergio Brandriss

Paul J Steffas

Sui-hing Leung

Jun Li

Bahubali S Upadhye

Tom Anthony

Sandip S Desai

Fabio Pieralisi

Liang Zhao

Elias I Franses

David S Corti

Yung-Jih Yang

Sascha De Pena

Valentina Furin

Andrea Bigolin

Andrea Maccari

James Elmer Abbott Jr

A photocurable composition includes quantum dots, quantum dot precursor materials, a chelating agent, one or more monomers, and a photoinitiator. The quantum dots are selected to emit radiation in a first wavelength band in the visible light range in response to absorption of radiation in a second wavelength band in the UV or visible light range. The second wavelength band is different than the first wavelength band. The quantum dot precursor materials include metal atoms or metal ions corresponding to metal components present in the quantum dots. The chelating agent is configured to chelate the quantum dot precursor materials. The photoinitiator initiates polymerization of the one or more monomers in response to absorption of radiation in the second wavelength band.

Chelating agents for quantum dot precursor materials in color conversion layers for micro-LEDs

A display screen includes a backplane, an array of light-emitting diodes electrically integrated with the backplane, the array of light-emitting diodes configured to emit UV light in a first wavelength range, and a plurality of isolation walls formed on the backplane between adjacent light-emitting diodes of the array of light-emitting diodes with the isolation walls spaced apart from the light-emitting diodes and extending above the light-emitting diodes. The plurality of isolation walls include a core of a first material and a coating covering at least a portion of the core extending above the light-emitting diodes. The coating is an opaque second material having transmittance less than 1% of light in the first wavelength range.

Micro-LED displays to reduce subpixel crosstalk

A method of fabricating a multi-color display includes forming a host matrix over a display having an array of light emitting diodes. The host matrix is sensitive to ultraviolet light. A first plurality of light emitting diodes in a first plurality of wells are activated to illuminate a portion of the host matrix to cause the portion of the host matrix to develop internal porous structures. A first photo-curable fluid including a first color conversion agent is dispensed. The first plurality of light emitting diodes in the first plurality of wells are activated to illuminate and cure the first photo-curable fluid to form a first color conversion layer over each of the first plurality of light emitting diodes, and an uncured remainder of the first photo-curable fluid is removed.

Print process for color conversion layer using porous host or positive photoresist

A method for manufacturing micro-LED displays includes depositing a first material over a substrate having a plurality of micro-LEDs such that the plurality of micro-LEDs are covered by the first material and the first material fills gaps laterally separating the micro-LEDs, removing a portion of the first material from the gaps that laterally separate the plurality of micro-LEDs to form trenches that extend to or below light-emitting layers of the micro-LEDs, depositing a second material over the substrate such that the second material covers the first material and extends into the trenches, and removing a portion of the first and second material over the plurality of micro-LEDs to expose top surfaces of the plurality of micro-LEDs and such that isolation walls positioned in the gaps between the plurality of micro-LEDs extend vertically higher than the top surface of the first material.

Manufacturing micro-LED displays to reduce subpixel crosstalk

In one example, a non-transitory processor readable medium having instructions thereon that when executed cause an additive manufacturing machine to expose build material to a light source emitting monochromatic light within a band of wavelengths that includes a peak light absorption of a liquid coalescing agent to be dispensed on to the build material.

Lighting for additive manufacturing

An LED display fabrication tool includes a plurality of process chambers and a plurality of transfer chambers. The plurality of process chambers include first and second dispensing chambers to deliver first and second color conversion precursors onto a workpiece for fabrication of a light emitting diode (LED) displays, and first and second washing/drying chambers to remove uncured portions of the first and second color conversion precursors from the workpiece and then dries the workpiece. The plurality of transfer chambers are coupled to two process chambers by two respective sealable ports. First and second curing stations cure the precursors to form the first and second color conversion layers over a first set of LEDs on the workpiece.

System configurations for fabrication of micro-LED displays

A multi-color display includes a backplane having backplane circuitry, an array of micro-LEDs electrically integrated with backplane circuitry of the backplane, a color conversion layer over each of a plurality of light emitting diodes, and a plurality of isolation walls separating adjacent micro-LEDs of the array.

Assembly of display with color conversion layer and isolation walls

A formulation, system, and method for additive manufacturing of a polishing pad. The formulation includes monomer, dispersant, and nanoparticles. A method of preparing the formulation includes adding a dispersant that is a polyester derivative to monomer, adding metal-oxide nanoparticles to the monomer, and subjecting the monomer having the nanoparticles and dispersant to sonication to disperse the nanoparticles in the monomer.

Additive manufacturing of polishing pads

A photocurable composition includes a blue photoluminescent material, one or more monomers, and a photoinitiator that initiates polymerization of the one or more monomers in response to absorption of the ultraviolet light. The blue photoluminescent material is selected to absorb ultraviolet light with a maximum wavelength in a range of about 300 nm to about 430 nm and to emit blue light. The blue photoluminescent material also has an emission peak in a range of about 420 nm to about 480 nm. The full width at half maximum of the emission peak is less than 100 nm, and the photoluminescence quantum yield is in a range of 5% to 100%.

Blue color converter for micro LEDs

A method of fabricating a multi-color display includes dispensing a photo-curable fluid over a display having an array of light emitting diodes (micro-LEDs) disposed below a cover layer. The cover has an outer surface with a plurality of recesses, and the photo-curable fluid fills the recesses. The photo-curable fluid includes a color conversion agent. A plurality of LEDs in the array are activated to illuminate and cure the photo-curable fluid to form a color conversion layer in the recesses over the activated LEDs. This layer will convert light from these LEDs to light of a first color. An uncured remainder of the photo-curable fluid is removed. Then the process is repeated with a different photo-curable fluid having a different color conversion agent and a different plurality of LEDs. This forms a second color conversion layer in different plurality of recesses to convert light from these LEDs to light of a second color.

Display formed by curing of color conversion layer in recess

Exemplary processing methods include forming a group of LED structures on a substrate layer to form a patterned LED substrate. A light absorption barrier may be deposited on the patterned LED substrate. The methods may further include exposing the patterned LED substrate to light. The light may be absorbed by surfaces of the LED structures that are in contact with the substrate layer, and the light absorption barrier. The methods may still further include separating the LED structures for the substrate layer. The bonding between the LED structures and the substrate layer may be weakened by the absorption of the light by the surfaces of the LED structures in contact with the substrate layer.

Light absorbing barrier for LED fabrication processes

A multi-color display includes a backplane having backplane circuitry, an array of micro-LEDs electrically integrated with backplane circuitry of the backplane, a first color conversion layer over each of a first plurality of light emitting diodes, a second color conversion layer over each of a second plurality of light emitting diodes, and a plurality of isolation walls separating adjacent micro-LEDs of the array. The micro-LEDs of the array are configured to generate illumination of the same wavelength range, the first color conversion layer converts the illumination to light of a first color, and the second color conversion layer converts the illumination to light of a different second color.

Display with color conversion layer and isolation walls

A photocurable composition includes a nanomaterial selected to emit radiation in a first wavelength band in the visible light range in response to absorption of radiation in a second wavelength band in the UV or visible light range. The second wavelength band is different than the first wavelength band. The photocurable composition further includes one or more (meth)acrylate monomers, a thiol crosslinker, and a photoinitiator that initiates polymerization of the one or more (meth)acrylate monomers in response to absorption of radiation in the second wavelength band. A light-emitting device includes a plurality of light-emitting diodes and the cured photocurable composition in contact with a surface through which radiation in a first wavelength band in the UV or visible light range is emitted from each of the light-emitting diodes.

Quantum dot formulations with thiol-based crosslinkers for UV-LED curing

Polishing articles and methods of manufacturing polishing articles used in polishing processes and cleaning processes are provided. More particularly, implementations disclosed herein relate to composite polishing articles having tunable properties such as hydrophilicity and zeta potential. 3D printed chemical-mechanical planarization (CMP) pads composed of UV curable acrylic chemistry are generally hydrophobic in nature. Such hydrophobic behavior affects the wetting properties with abrasive-based polishing slurries such as ceria-base slurries. However, in order to increase the planarization and removal rate while decreasing defects, hydrophilic pads are preferred. In addition, it is desirable that the zeta potential (Zp) of the pads be tunable over a wide range of conditions at different pH values. Implementations of the present disclosure include methods for increasing the hydrophilicity and tuning the Zp of the pads with anionic additives and pads produced using these methods.

Anionic polishing pads formed by printing processes

Growing community of inventors

Campbell, CA, United States of America

Hou Tee Ng