Patents by Inventor Yongtaek Hong

Yongtaek Hong 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).

  • Publication number: 20200344877
    Abstract: Disclosed is an apparatus for fabricating a stretchable electrical circuit, including: a stretching device configured to stretch a mounted stretchable substrate in two different directions; a marking device configured to mark a mark on the stretchable substrate; an image device configured to obtain an image of the stretchable substrate on which a plurality of alignment marks are marked by the marking device; and a control device configured to control the stretching device, the image device, and the marking device. The control device forms a first axis and a second axis using the plurality of alignment marks marked on the image obtained by the image device and marks one point of a surface of the stretchable substrate with coordinates made by the first axis and the second axis using the first axis and the second axis.
    Type: Application
    Filed: July 10, 2020
    Publication date: October 29, 2020
    Applicant: Seoul National University R&DB Foundation
    Inventors: YONGTAEK HONG, BYEONGMOON LEE, JUNGHWAN BYUN
  • Publication number: 20200271835
    Abstract: Provided are a multi-flexible display device having improved image discontinuity at a panel boundary, and a method of manufacturing a double-sided reflector therefor. An image discontinuity phenomenon at a boundary between panels of a multi-flexible display device manufactured by tiling a plurality of flexible displays including a bendable panel may be easily and simply ameliorated using a double-sided reflector capable of being manufactured through a simple process and at low cost.
    Type: Application
    Filed: February 4, 2020
    Publication date: August 27, 2020
    Applicant: Seoul National University R&DB Foundation
    Inventors: Yongtaek HONG, Seung Hwan LEE, Hyung Soo YOON, Byoung Ho LEE, Chan Hyung YOO, Dong Yeon KIM
  • Patent number: 10757803
    Abstract: Disclosed herein are a method of fabricating a stretchable electrical circuit and an apparatus for fabricating a stretchable electrical circuit, wherein the method of fabricating a stretchable electrical circuit includes stretching a stretchable substrate, forming a plurality of alignment marks on a surface of the stretchable substrate, forming a first axis extending from a line connecting two alignment marks among the plurality of alignment marks, and a second axis perpendicular to the first axis, marking one point of the surface of the stretched stretchable substrate with coordinates made by the first axis and the second axis, and disposing electrical components using the coordinates.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: August 25, 2020
    Assignee: Seoul National University R&DB Foundation
    Inventors: Yongtaek Hong, Byeongmoon Lee, Junghwan Byun
  • Publication number: 20190380199
    Abstract: A method for forming a flexible substrate having a via, according to the present embodiment, comprises the steps of: (a) arranging a mixture of conductive particles moving by means of a magnetic field, when a curable resin and the magnetic field are provided; (b) forming a material layer being cured and having flexibility; (c) arranging the conductive particles by providing a magnetic field; and (d) curing the curable resin and the material layer.
    Type: Application
    Filed: September 22, 2017
    Publication date: December 12, 2019
    Inventors: YONGTAEK HONG, EUNHO OH, Junghwan Byun, Byeongmoon Lee
  • Publication number: 20190335582
    Abstract: A method for forming a stretchable platform according to one embodiment comprises: (a) a step of forming an adhesive layer on one surface of a rigid member; (b) a step of modifying one surface of a stretchable substrate and an adhesive layer surface to form an incomplete bond; and (c) a step of bonding so as to form a covalent bond between the one surface of a modified stretchable substrate and the adhesive layer surface.
    Type: Application
    Filed: January 8, 2018
    Publication date: October 31, 2019
    Inventors: YONGTAEK HONG, YUNSIK HONG, JAE-YOUNG YOON
  • Publication number: 20170332486
    Abstract: Disclosed herein are a method of fabricating a stretchable electrical circuit and an apparatus for fabricating a stretchable electrical circuit, wherein the method of fabricating a stretchable electrical circuit includes stretching a stretchable substrate, forming a plurality of alignment marks on a surface of the stretchable substrate, forming a first axis extending from a line connecting two alignment marks among the plurality of alignment marks, and a second axis perpendicular to the first axis, marking one point of the surface of the stretched stretchable substrate with coordinates made by the first axis and the second axis, and disposing electrical components using the coordinates.
    Type: Application
    Filed: May 15, 2017
    Publication date: November 16, 2017
    Applicant: Seoul National University R&DB Foundation
    Inventors: Yongtaek HONG, Byeongmoon LEE, Junghwan BYUN
  • Patent number: 9818965
    Abstract: A method of fabricating an organic light-emitting device, including: providing a substrate; forming a control electrode on the substrate; forming an insulating layer covering at least a top surface of the control electrode; forming a hole transport layer pattern through printing on at least a part of the insulating layer; forming an organic light-emitting layer to be in contact with at least a part of a surface of the hole transport layer pattern; forming an electron transport layer pattern through printing to be in contact with at least a part of a surface of the organic light-emitting layer; and forming a first electrode and a second electrode respectively on the hole transport layer pattern and the electron transport layer pattern.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: November 14, 2017
    Assignee: SNU R&DB FOUNDATION
    Inventors: Hyunduck Cho, Jeongkyun Roh, Hyunkoo Lee, Changhee Lee, Yongtaek Hong
  • Patent number: 9565753
    Abstract: There is provided a stretchable substrate including: a substrate having first Young's modulus and stretchability; and plurality of strain control patterns having second Young's modulus and arranged on the substrate, in which strain due to an external force depends on arrangement of the plurality of strain control patterns.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: February 7, 2017
    Assignee: SNU R&DB FOUNDATION
    Inventors: Yongtaek Hong, Jung hwan Byun, Sangwoo Kim
  • Publication number: 20160072090
    Abstract: A method of fabricating an organic light-emitting device, including: providing a substrate; forming a control electrode on the substrate; forming an insulating layer covering at least a top surface of the control electrode; forming a hole transport layer pattern through printing on at least a part of the insulating layer; forming an organic light-emitting layer to be in contact with at least a part of a surface of the hole transport layer pattern; forming an electron transport layer pattern through printing to be in contact with at least a part of a surface of the organic light-emitting layer; and forming a first electrode and a second electrode respectively on the hole transport layer pattern and the electron transport layer pattern.
    Type: Application
    Filed: November 13, 2015
    Publication date: March 10, 2016
    Applicant: SNU R&DB FOUNDATION
    Inventors: Hyunduck CHO, Jeongkyun ROH, Hyunkoo LEE, Changhee LEE, Yongtaek HONG
  • Publication number: 20150189741
    Abstract: There is provided a stretchable substrate including: a substrate having first Young's modulus and stretchability; and plurality of strain control patterns having second Young's modulus and arranged on the substrate, in which strain due to an external force depends on arrangement of the plurality of strain control patterns.
    Type: Application
    Filed: December 30, 2014
    Publication date: July 2, 2015
    Inventors: Yongtaek HONG, Jung hwan BYUN, Sangwoo KIM
  • Patent number: 9001517
    Abstract: A flexible conduction trace includes a flexible line; and a plurality of conductive particles arranged in the form of pillars within the flexible line.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: April 7, 2015
    Assignee: SNU R&DB Foundation
    Inventors: Yongtaek Hong, Sangwoo Kim
  • Publication number: 20140085837
    Abstract: A flexible conduction trace includes a flexible line; and a plurality of conductive particles arranged in the form of pillars within the flexible line.
    Type: Application
    Filed: June 20, 2013
    Publication date: March 27, 2014
    Inventors: Yongtaek Hong, Sangwoo Kim
  • Patent number: 7743492
    Abstract: A method for forming an electronic device provides a casting master having a casting surface, and deposits a substrate material onto the casting surface to form a flexible substrate sheet of predetermined thickness, wherein the flexible substrate sheet has a circuit-side surface that is formed against the casting surface. The flexible substrate sheet is released from the master and secured against a carrier, with the circuit-side surface facing outward. An electronic device is then formed on the circuit-side surface.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: June 29, 2010
    Assignee: Carestream Health, Inc.
    Inventors: Roger Stanley Kerr, Timothy John Tredwell, Yongtaek Hong
  • Patent number: 7615731
    Abstract: A photosensor array includes data and scan lines (124, 148), circuitry of each data line/scan line pair formed in a backplane (110) on a substrate (102). On a first electrode scan line (148) a switching element (112) responds to a scan signal, connecting a first terminal (106) to a second terminal (108). A front plane (120) has sensing elements (122) indicating a measure of a received stimulus and including a charge collection electrode (130). An insulating layer (140) disposed between the backplane (110) and the front plane (120) contains at least a first via (136) connecting the first terminal (108) of the switching element (112) in the backplane (110) to a charge collection electrode (130) of the sensing element (122) in the front plane (120). A second via (126) connects between the second terminal (108) of the switching element (112) and the data line (124).
    Type: Grant
    Filed: September 14, 2006
    Date of Patent: November 10, 2009
    Assignee: Carestream Health, Inc.
    Inventors: Gregory N. Heiler, Timothy J. Tredwell, Mark D. Bedzyk, Roger S. Kerr, Yuriy Vygranenko, Denis Striakhilev, Yongtaek Hong, Jackson C. S. Lai, Arokia Nathan
  • Publication number: 20090199401
    Abstract: A method for forming an electronic device provides a casting master having a casting surface, and deposits a substrate material onto the casting surface to form a flexible substrate sheet of predetermined thickness, wherein the flexible substrate sheet has a circuit-side surface that is formed against the casting surface. The flexible substrate sheet is released from the master and secured against a carrier, with the circuit-side surface facing outward. An electronic device is then formed on the circuit-side surface.
    Type: Application
    Filed: February 8, 2008
    Publication date: August 13, 2009
    Inventors: Roger Stanley Kerr, Timothy John Tredwell, Yongtaek Hong
  • Publication number: 20080067324
    Abstract: A photosensor array includes data and scan lines (124, 148), circuitry of each data line/scan line pair formed in a backplane (110) on a substrate (102). On a first electrode scan line (148) a switching element (112) responds to a scan signal, connecting a first terminal (106) to a second terminal (108). A front plane (120) has sensing elements (122) indicating a measure of a received stimulus and including a charge collection electrode (130). An insulating layer (140) disposed between the backplane (110) and the front plane (120) contains at least a first via (136) connecting the first terminal (108) of the switching element (112) in the backplane (110) to a charge collection electrode (130) of the sensing element (122) in the front plane (120). A second via (126) connects between the second terminal (108) of the switching element (112) and the data line (124).
    Type: Application
    Filed: September 14, 2006
    Publication date: March 20, 2008
    Inventors: Gregory N. Heiler, Timothy J. Tredwell, Mark D. Bedzyk, Roger S. Kerr, Yuriy Vygranenko, Denis Striakhilev, Yongtaek Hong, Jackson C. S. Lai, Arokia Nathan
  • Publication number: 20070176538
    Abstract: An OLED device comprising: an electrically insulating substrate; a plurality of light emitting pixels formed over the substrate wherein each pixel includes first and second spaced apart electrodes and organic electroluminescent media disposed between the first and second electrodes; a first thin film transistor associated with a first pixel and disposed above the substrate and having a gate electrode, a semiconductor region, a source terminal and a drain terminal; a continuously formed conductive layer positioned under the pixels and disposed above the substrate and disposed below the first thin film transistor and the organic electroluminescent media; an insulator layer disposed between the continuous conductor layer and the thin film transistor and having a first contact hole; and electrical connection is provided from the continuous conductor layer, through the first contact hole to either the source terminal or drain terminal of the first thin film transistor.
    Type: Application
    Filed: February 2, 2006
    Publication date: August 2, 2007
    Inventors: Dustin Winters, Yongtaek Hong
  • Publication number: 20070077511
    Abstract: A method for forming a resist pattern on a substrate (18) places a donor element (12) having a layer of thermoresist material proximate the substrate. A gap is maintained such that the surface of the layer of thermoresist material is spaced apart from the surface of the substrate by a number of spacing elements. Thermal energy is directed toward the donor element (12) according to the resist pattern, whereby a portion of thermoresist material is transferred from the donor element (12) across the gap by ablative transfer and is deposited onto the substrate (18) forming the resist pattern.
    Type: Application
    Filed: September 30, 2005
    Publication date: April 5, 2007
    Inventors: Timothy Tredwell, Lee Tutt, David Kay, Yongtaek Hong, Glenn Pearce, Scott Phillips
  • Patent number: 7198879
    Abstract: A method for forming a resist pattern on a substrate (18) places a donor element (12) having a layer of thermoresist material proximate the substrate. A gap is maintained such that the surface of the layer of thermoresist material is spaced apart from the surface of the substrate by a number of spacing elements. Thermal energy is directed toward the donor element (12) according to the resist pattern, whereby a portion of thermoresist material is transferred from the donor element (12) across the gap by ablative transfer and is deposited onto the substrate (18) forming the resist pattern.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: April 3, 2007
    Assignee: Eastman Kodak Company
    Inventors: Timothy J. Tredwell, Lee W. Tutt, David B. Kay, Yongtaek Hong, Glenn T. Pearce, Scott E. Phillips
  • Publication number: 20060127817
    Abstract: A method for in-line fabrication of curved surface transistors (10) forms a flexible substrate (12) into a predetermined shape. A first passivation layer (14) is deposited. A first metal layer (16) in a first pattern is deposited. An insulator layer (18) in a second pattern is deposited. A first semiconductor (20) in a third pattern and a second semiconductor (22) in a fourth pattern are deposited. A second metal layer (24) in a fifth pattern is deposited. A second passivation layer (28) in a sixth pattern is deposited.
    Type: Application
    Filed: December 10, 2004
    Publication date: June 15, 2006
    Inventors: Sujatha Ramanujan, Yongtaek Hong