Patents by Inventor Siddharth Harikrishna Mohan

Siddharth Harikrishna Mohan 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).

  • ORGANIC ELECTROLUMINESCENT DEVICES
    Publication number: 20240268144
    Abstract: A novel thin film encapsulated OLED panel architecture and a method for making the panels with improved shelf life is disclosed. The OLED panel consists of a plurality of OLED pixels; each OLED pixel is individually hermetically sealed and isolated from its neighboring pixels. The organic stack of the OLED pixel is contained within its own hermetically sealed structure, achieved by making the structure on a barrier coated substrate and using a first barrier material as the grid and a second barrier for encapsulating the entire OLED pixel. The first barrier material provides the edge seal while the second barrier disposed over the pixel provides protection from top down moisture diffusion. By isolating and hermetically sealing individual pixels; any damage such as moisture and oxygen ingress due to defects or particles, delamination, cracking etc. can be effectively contained within the pixel thereby protecting other pixels in the panel.
    Type: Application
    Filed: April 19, 2024
    Publication date: August 8, 2024
    Inventors: Siddharth HARIKRISHNA MOHAN, William E. QUINN, Ruiqing MA, Emory KRALL, Luke WALSKI
  • STABILIZED PRINT MATERIALS
    Publication number: 20240254356
    Abstract: A print material includes a vinylic molecule, a vinylic cross-linker molecule having a plurality of vinyl groups, a quantum dot, a light-scattering particle having a surface composition, and a dispersant having a chemical affinity matched to the surface composition. Methods of making and using such print materials are also described.
    Type: Application
    Filed: February 26, 2024
    Publication date: August 1, 2024
    Applicant: Kateeva, Inc.
    Inventors: Elena Rogojina, Inna Gurevitch, Teresa A. Ramos, Siddharth Harikrishna-Mohan, Robert Richard Roth, Noa Cohen, Elena Sheina
  • ORGANIC VAPOR JET PRINTING SYSTEM
    Publication number: 20240247375
    Abstract: Systems and techniques for depositing organic material on a substrate are provided, in which one or more shield gas flows prevents contamination of the substrate by the chamber ambient. Thus, multiple layers of the same or different materials may be deposited in a single deposition chamber, without the need for movement between different deposition chambers, and with reduced chance of cross-contamination between layers.
    Type: Application
    Filed: April 3, 2024
    Publication date: July 25, 2024
    Inventors: Gregory MCGRAW, William E. QUINN, Gregg KOTTAS, Siddharth HARIKRISHNA MOHAN, Matthew KING
  • Stretchable Display
    Publication number: 20240210995
    Abstract: A display may have a stretchable portion with hermetically sealed rigid pixel islands. A flexible interconnect region may be interposed between the hermetically sealed rigid pixel islands. The hermetically sealed rigid pixel islands may include organic light-emitting diode (OLED) pixels. A conductive cutting structure may have an undercut that causes a discontinuity in a conductive OLED layer to mitigate lateral leakage. The conductive cutting structure may also be electrically connected to a cathode for the OLED pixels and provide a cathode voltage to the cathode. First and second inorganic passivation layers may be formed over the OLED pixels. Multiple discrete portions of an organic inkjet printed layer may be interposed between the first and second inorganic passivation layers.
    Type: Application
    Filed: October 10, 2023
    Publication date: June 27, 2024
    Inventors: Prashant Mandlik, Bhadrinarayana Lalgudi Visweswaran, Mahendra Chhabra, Chia-Hao Chang, Shiyi Liu, Siddharth Harikrishna Mohan, Zhen Zhang, Han-Chieh Chang, Yi Qiao, Yue Cui, Tyler R Kakuda, Michael Vosgueritchian, Sudirukkuge T. Jinasundera, Warren S Rieutort-Louis, Tsung-Ting Tsai, Jae Won Choi, Jiun-Jye Chang, Jean-Pierre S Guillou, Rui Liu, Po-Chun Yeh, Chieh Hung Yang, Ankit Mahajan, Takahide Ishii, Pei-Ling Lin, Pei Yin, Gwanwoo Park, Markus Einzinger, Martijn Kuik, Abhijeet S Bagal, Kyounghwan Kim, Jonathan H Beck, Chiang-Jen Hsiao, Chih-Hao Kung, Chih-Lei Chen, Chih-Yu Chung, Chuan-Jung Lin, Jung Yen Huang, Kuan-Chi Chen, Shinya Ono, Wei Jung Hsieh, Wei-Chieh Lin, Yi-Pu Chen, Yuan Ming Chiang, An-Di Sheu, Chi-Wei Chou, Chin-Fu Lee, Ko-Wei Chen, Kuan-Yi Lee, Weixin Li, Shin-Hung Yeh, Shyuan Yang, Themistoklis Afentakis, Asli Sirman, Baolin Tian, Han Liu
  • QUANTUM DOT COLOR FILTER INK COMPOSITIONS AND DEVICES UTILIZING THE SAME
    Publication number: 20240192548
    Abstract: Liquid ink compositions containing quantum dots for optoelectronic display applications are provided. Also provided are solid films formed by drying the ink compositions, optical elements incorporating the solid films, display devices incorporating the optical elements, and methods of forming the solid films, optical elements, and the devices. Liquid ink compositions and solid films made by drying the liquid ink compositions include one or more blue light-absorbing materials in combination with red light-emitting QDs or green light-emitting QDs.
    Type: Application
    Filed: January 11, 2024
    Publication date: June 13, 2024
    Applicant: Kateeva, Inc.
    Inventors: Conor F. Madigan, Siddharth Harikrishna-Mohan, Florian Pschenitzka, Teresa A. Ramos, Inna Gurevitch
  • Hermetically sealed isolated OLED pixels
    Patent number: 11997866
    Abstract: A novel thin film encapsulated OLED panel architecture and a method for making the panels with improved shelf life is disclosed. The OLED panel consists of a plurality of OLED pixels; each OLED pixel is individually hermetically sealed and isolated from its neighboring pixels. The organic stack of the OLED pixel is contained within its own hermetically sealed structure, achieved by making the structure on a barrier coated substrate and using a first barrier material as the grid and a second barrier for encapsulating the entire OLED pixel. The first barrier material provides the edge seal while the second barrier disposed over the pixel provides protection from top down moisture diffusion. By isolating and hermetically sealing individual pixels; any damage such as moisture and oxygen ingress due to defects or particles, delamination, cracking etc. can be effectively contained within the pixel thereby protecting other pixels in the panel.
    Type: Grant
    Filed: December 29, 2020
    Date of Patent: May 28, 2024
    Assignee: Universal Display Corporation
    Inventors: Siddharth Harikrishna Mohan, William E. Quinn, Ruiqing Ma, Emory Krall, Luke Walski
  • Organic vapor jet printing system
    Patent number: 11976360
    Abstract: Systems and techniques for depositing organic material on a substrate are provided, in which one or more shield gas flows prevents contamination of the substrate by the chamber ambient. Thus, multiple layers of the same or different materials may be deposited in a single deposition chamber, without the need for movement between different deposition chambers, and with reduced chance of cross-contamination between layers.
    Type: Grant
    Filed: January 20, 2023
    Date of Patent: May 7, 2024
    Assignee: Universal Display Corporation
    Inventors: Gregory McGraw, William E. Quinn, Gregg Kottas, Siddharth Harikrishna Mohan, Matthew King
  • Stabilized print materials
    Patent number: 11945961
    Abstract: A print material includes a vinylic molecule, a vinylic cross-linker molecule having a plurality of vinyl groups, a quantum dot, a light-scattering particle having a surface composition, and a dispersant having a chemical affinity matched to the surface composition. Methods of making and using such print materials are also described.
    Type: Grant
    Filed: June 27, 2022
    Date of Patent: April 2, 2024
    Assignee: Kateeva, Inc.
    Inventors: Elena Rogojina, Inna Gurevitch, Teresa A. Ramos, Siddharth Harikrishna-Mohan, Robert Richard Roth, Noa Cohen, Elena Sheina
  • Quantum dot color filter ink compositions and devices utilizing the same
    Patent number: 11906849
    Abstract: Liquid ink compositions containing quantum dots for optoelectronic display applications are provided. Also provided are solid films formed by drying the ink compositions, optical elements incorporating the solid films, display devices incorporating the optical elements, and methods of forming the solid films, optical elements, and the devices. Liquid ink compositions and solid films made by drying the liquid ink compositions include one or more blue light-absorbing materials in combination with red light-emitting QDs or green light-emitting QDs.
    Type: Grant
    Filed: September 30, 2021
    Date of Patent: February 20, 2024
    Assignee: Kateeva, Inc.
    Inventors: Conor F. Madigan, Siddharth Harikrishna-Mohan, Florian Pschenitzka, Teresa A. Ramos, Inna Gurevitch
  • Organic Light-Emitting Diode Display With Pixel Definition Layers
    Publication number: 20240023382
    Abstract: An organic light-emitting diode (OLED) display may have an array of organic light-emitting diode pixels that each have OLED layers interposed between a cathode and an anode. Voltage may be applied to the anode of each pixel to control the magnitude of emitted light. The conductivity of the OLED layers may allow leakage current to pass between neighboring anodes in the display. To reduce leakage current and the accompanying cross-talk in a display, a cutting structure may disrupt continuity of the OLED layers. The cutting structure may have two undercuts to disrupt continuity of at least some of the OLED layers. The cutting structure may include a conductive portion that provides a cathode voltage to a cathode layer for the OLED pixels.
    Type: Application
    Filed: September 28, 2023
    Publication date: January 18, 2024
    Inventors: Siddharth Harikrishna Mohan, Gwanwoo Park, Ping Kuen Daniel Tsang, Pei Yin, Weixin Li, Li-An Liu, Alexandru Riposan, Teruo Sasagawa, Steven J Brewer, Younggu Lee, Mitsuhiro Kashiwabara, Rui Liu, Hung-Yi Tsai, Tien-Pei Chou, Yi Wen Wang, Mahendra Chhabra, Chieh Hung Yang, Bhadrinarayana Lalgudi Visweswaran, David K. Schoenwald
  • Microfluidic device and method using double anodic bonding
    Patent number: 11761076
    Abstract: A microfluidic device for use with a microfluidic delivery system, such as an organic vapor jet printing device, includes a glass layer that is directly bonded to a microfabricated die and a metal plate via a double anodic bond. The double anodic bond is formed by forming a first anodic bond at an interface of the microfabricated die and the glass layer, and forming a second anodic bond at an interface of the metal plate and the glass layer, where the second anodic bond is formed using a voltage that is lower than the voltage used to form the first anodic bond. The second anodic bond is formed with the polarity of the voltage reversed with respect to the glass layer and the formation of the first anodic bond. The metal plate includes attachment features that allow removal of the microfluidic device from a fixture.
    Type: Grant
    Filed: May 3, 2021
    Date of Patent: September 19, 2023
    Assignee: The Regents of the University of Michigan
    Inventors: Stephen Forrest, Gregory McGraw, Siddharth Harikrishna Mohan, Diane L. Peters
  • Hybrid thin film permeation barrier and method of making the same
    Patent number: 11751426
    Abstract: A hybrid permeation barrier having two complementary layers is disclosed. The barrier includes a first layer with a relatively high stress-thickness in the range of ?1000 MPa-?m to ?200 MPa-?m and a second layer with a relatively low stress-thickness in the range ?150 MPa-?m to 300 MPa-?m. The second layer compensates for the stress caused by the first, thereby allowing for a barrier that provides good permeation without causing failure of the device due to delamination.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: September 5, 2023
    Assignee: Universal Display Corporation
    Inventors: Siddharth Harikrishna Mohan, William E. Quinn, Arpit Patel, James Robert Kantor
  • Controlled deposition of materials using a differential pressure regime
    Patent number: 11751468
    Abstract: Methods and devices for controlling pressures in microenvironments between a deposition apparatus and a substrate are provided. Each microenvironment is associated with an aperture of the deposition apparatus which can allow for control of the microenvironment.
    Type: Grant
    Filed: July 20, 2021
    Date of Patent: September 5, 2023
    Assignee: Universal Display Corporation
    Inventors: William E. Quinn, Siddharth Harikrishna Mohan, Gregory McGraw, Xin Xu
  • SYSTEMS AND METHODS OF MODULATING FLOW DURING VAPOR JET DEPOSITION OF ORGANIC MATERIALS
    Publication number: 20230183852
    Abstract: Embodiments of the disclosed subject matter provide methods and systems including a nozzle, a source of material to be deposited on a substrate in fluid communication with the nozzle, a delivery gas source in fluid communication with the source of material to be deposited with the nozzle, an exhaust channel disposed adjacent to the nozzle, a confinement gas source in fluid communication with the nozzle and the exhaust channel, and disposed adjacent to the exhaust channel, and an actuator to adjust a fly height separation between a deposition nozzle aperture of the nozzle and a deposition target. The adjustment of the fly height separation may stop and/or start the deposition of the material from the nozzle.
    Type: Application
    Filed: December 15, 2022
    Publication date: June 15, 2023
    Inventors: Gregory McGRAW, William E. QUINN, Matthew KING, Elliot H. HARTFORD, JR., Siddharth HARIKRISHNA MOHAN, Benjamin SWEDLOVE, Gregg KOTTAS
  • Organic Vapor Jet Printing System
    Publication number: 20230151491
    Abstract: Systems and techniques for depositing organic material on a substrate are provided, in which one or more shield gas flows prevents contamination of the substrate by the chamber ambient. Thus, multiple layers of the same or different materials may be deposited in a single deposition chamber, without the need for movement between different deposition chambers, and with reduced chance of cross-contamination between layers.
    Type: Application
    Filed: January 20, 2023
    Publication date: May 18, 2023
    Inventors: Gregory MCGRAW, William E. QUINN, Gregg KOTTAS, Siddharth HARIKRISHNA MOHAN, Matthew KING
  • Methods of modulating flow during vapor jet deposition of organic materials
    Patent number: 11591686
    Abstract: Methods of modulating flow during vapor jet deposition of organic materials are provided. A method may include ejecting a vapor entrained in a delivery gas from a nozzle onto a substrate upon which the vapor condenses. A confinement gas may be provided that has a flow direction opposing a flow direction of the delivery gas ejected from the nozzle. A vacuum source may be provided that is adjacent to a delivery gas aperture of the nozzle. The method may include adjusting, by an actuator, a fly height separation between a deposition nozzle aperture of the nozzle and a deposition target.
    Type: Grant
    Filed: October 28, 2020
    Date of Patent: February 28, 2023
    Assignee: Universal Display Corporation
    Inventors: Gregory McGraw, William E. Quinn, Matthew King, Elliot H. Hartford, Jr., Siddharth Harikrishna Mohan, Benjamin Swedlove, Gregg Kottas
  • Apparatus and method for printing multilayer organic thin films from vapor phase in an ultra-pure gas ambient
    Patent number: 11584991
    Abstract: Systems and techniques for depositing organic material on a substrate are provided, in which one or more shield gas flows prevents contamination of the substrate by the chamber ambient. Thus, multiple layers of the same or different materials may be deposited in a single deposition chamber, without the need for movement between different deposition chambers, and with reduced chance of cross-contamination between layers.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: February 21, 2023
    Assignee: Universal Display Corporation
    Inventors: Gregory McGraw, William E. Quinn, Gregg Kottas, Siddharth Harikrishna Mohan, Matthew King
  • STABILIZED PRINT MATERIALS
    Publication number: 20220332966
    Abstract: A print material includes a vinylic molecule, a vinylic cross-linker molecule having a plurality of vinyl groups, a quantum dot, a light-scattering particle having a surface composition, and a dispersant having a chemical affinity matched to the surface composition. Methods of making and using such print materials are also described.
    Type: Application
    Filed: June 27, 2022
    Publication date: October 20, 2022
    Applicant: Kateeva, Inc.
    Inventors: Elena Rogojina, Inna Gurevitch, Teresa A. Ramos, Siddharth Harikrishna-Mohan, Robert Richard Roth, Noa Cohen, Elena Sheina
  • Organic Light-Emitting Diode Display with Single Anti-Node Optical Cavities
    Publication number: 20220271254
    Abstract: An electronic device may have a display such as an organic light-emitting diode (OLED) display. The OLED display may have an array of OLED pixels that each have OLED layers interposed between a cathode and an anode. The pixels may be microcavity OLED pixels having optical cavities. The optical cavities may be defined by a partially transparent cathode layer and a reflective anode structure. The distance between the partially transparent cathode layer and the reflective anode structure for a pixel may be selected such that light at the wavelength emitted by the pixel forms a standing wave between the anode and the cathode. The standing wave may have only one anti-node and the emissive layer for the pixel may be aligned with that one anti-node. To mitigate short circuits, a roughness reduction layer and/or short-circuit-reducing layer having a high sheet resistance may be formed between the anode the OLED layers.
    Type: Application
    Filed: January 5, 2022
    Publication date: August 25, 2022
    Inventors: Niva A. Ran, Michelle C. Sherrott, Steven J. Brewer, Ping Kuen Daniel Tsang, KiBeom Kim, Hui Lu, Siddharth Harikrishna Mohan
  • Stabilized print materials
    Patent number: 11407914
    Abstract: A print material includes a vinylic molecule, a vinylic cross-linker molecule having a plurality of vinyl groups, a quantum dot, a light-scattering particle having a surface composition, and a dispersant having a chemical affinity matched to the surface composition. Methods of making and using such print materials are also described.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: August 9, 2022
    Assignee: Kateeva, Inc.
    Inventors: Elena Rogojina, Inna Gurevitch, Teresa A. Ramos, Siddharth Harikrishna-Mohan, Robert Richard Roth, Noa Cohen, Elena Sheina