Patents by Inventor Hohyun Keum

Hohyun Keum 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).

  • Patent number: 11930593
    Abstract: A stretchable display device comprises a display panel that includes a stretchable substrate where a plurality of emission elements is disposed, wherein the stretchable substrate is stretchable in at least one of a first direction and a second direction perpendicular to the first direction; a printed circuit film that includes a first driving circuit chip generating a drive control signal to be applied to the display panel and a second driving circuit chip receiving image data from outside and transferring the image data to the first driving circuit chip, wherein the printed circuit film is stretchable in at least one of the first direction and the second direction with respect to a stretch direction of the display panel.
    Type: Grant
    Filed: November 2, 2021
    Date of Patent: March 12, 2024
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Hohyun Keum, Mingyu Kang
  • Patent number: 11652187
    Abstract: The present disclosure describes one or more embodiment of a method for creating a patterned quantum dot layer. The method includes bringing a patterning stamp in contact with a layer of quantum dots disposed on a substrate, the patterning stamp comprising a patterned photoresist layer disposed on an elastomer layer, such that a portion of the quantum dots in contact with the patterned photoresist layer adheres to the patterning stamp, the portion of the quantum dots being adhered quantum dots. The method also includes peeling the patterning stamp from the substrate with a peeling speed larger than a pre-determined peeling speed to remove the adhered quantum dots from the substrate. A remaining portion of the quantum dots forms a patterned quantum dot layer on the substrate.
    Type: Grant
    Filed: September 14, 2021
    Date of Patent: May 16, 2023
    Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: Seok Kim, Moonsub Shim, Jun Kyu Park, Hohyun Keum, Yiran Jiang
  • Patent number: 11605803
    Abstract: A stretchable display device comprises a lower substrate, a plurality of island substrates disposed on the lower substrate and spaced apart from each other, a plurality of display elements disposed on the plurality of island substrates, a plurality of connecting lines disposed between each of the plurality of island substrates, an upper substrate disposed on the lower substrate, the plurality of display elements and the plurality of connecting lines, and a polarizing layer disposed on the upper substrate and including a phase delay layer on the upper substrate and a linear polarizing plate on the phase delay layer, wherein the phase delay layer includes a first base polymer, wherein the linear polarizing plate includes a second base polymer, and wherein the first and second base polymers include a same material as the upper substrate.
    Type: Grant
    Filed: April 16, 2021
    Date of Patent: March 14, 2023
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Kihan Kim, Hyokang Lee, Hohyun Keum
  • Publication number: 20220163883
    Abstract: A method of making a bonded polymeric assembly by transfer printing comprises contacting a stamp with a solid-phase ink comprising a photoresist to form an inked stamp, where the solid-phase ink is reversibly bound to the stamp. The inked stamp is aligned with an object comprising the photoresist and is stamped onto the object. The stamp is then removed, thereby transferring the solid-phase ink onto the object. The solid-phase ink is thermally joined with the object. Thus, a bonded polymeric assembly comprising a bonded joint between the solid-phase ink and the object is formed.
    Type: Application
    Filed: February 11, 2022
    Publication date: May 26, 2022
    Inventors: Seok Kim, Hohyun Keum, Jun Kyu Park
  • Patent number: 11281096
    Abstract: A method of making a bonded polymeric assembly by transfer printing comprises contacting a stamp with a solid-phase ink comprising a photoresist to form an inked stamp, where the solid-phase ink is reversibly bound to the stamp. The inked stamp is aligned with an object comprising the photoresist and is stamped onto the object. The stamp is then removed, thereby transferring the solid-phase ink onto the object. The solid-phase ink is thermally joined with the object. Thus, a bonded polymeric assembly comprising a bonded joint between the solid-phase ink and the object is formed.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: March 22, 2022
    Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: Seok Kim, Hohyun Keum, Jun Kyu Park
  • Publication number: 20220061154
    Abstract: A stretchable display device comprises a display panel that includes a stretchable substrate where a plurality of emission elements is disposed, wherein the stretchable substrate is stretchable in at least one of a first direction and a second direction perpendicular to the first direction; a printed circuit film that includes a first driving circuit chip generating a drive control signal to be applied to the display panel and a second driving circuit chip receiving image data from outside and transferring the image data to the first driving circuit chip, wherein the printed circuit film is stretchable in at least one of the first direction and the second direction with respect to a stretch direction of the display panel.
    Type: Application
    Filed: November 2, 2021
    Publication date: February 24, 2022
    Applicant: LG DISPLAY CO., LTD.
    Inventors: Hohyun KEUM, Mingyu KANG
  • Publication number: 20210408325
    Abstract: The present disclosure describes one or more embodiment of a method for creating a patterned quantum dot layer. The method includes bringing a patterning stamp in contact with a layer of quantum dots disposed on a substrate, the patterning stamp comprising a patterned photoresist layer disposed on an elastomer layer, such that a portion of the quantum dots in contact with the patterned photoresist layer adheres to the patterning stamp, the portion of the quantum dots being adhered quantum dots. The method also includes peeling the patterning stamp from the substrate with a peeling speed larger than a pre-determined peeling speed to remove the adhered quantum dots from the substrate. A remaining portion of the quantum dots forms a patterned quantum dot layer on the substrate.
    Type: Application
    Filed: September 14, 2021
    Publication date: December 30, 2021
    Applicant: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: Seok KIM, Moonsub SHIM, Jun Kyu PARK, Hohyun KEUM, Yiran JIANG
  • Patent number: 11197370
    Abstract: A stretchable display device comprises a display panel that includes a stretchable substrate where a plurality of emission elements is disposed, wherein the stretchable substrate is stretchable in at least one of a first direction and a second direction perpendicular to the first direction; a printed circuit film that includes a first driving circuit chip generating a drive control signal to be applied to the display panel and a second driving circuit chip receiving image data from outside and transferring the image data to the first driving circuit chip, wherein the printed circuit film is stretchable in at least one of the first direction and the second direction with respect to a stretch direction of the display panel.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: December 7, 2021
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Hohyun Keum, Mingyu Kang
  • Patent number: 11152536
    Abstract: The present disclosure describes one or more embodiment of a method for creating a patterned quantum dot layer. The method includes bringing a patterning stamp in contact with a layer of quantum dots disposed on a substrate, the patterning stamp comprising a patterned photoresist layer disposed on an elastomer layer, such that a portion of the quantum dots in contact with the patterned photoresist layer adheres to the patterning stamp, the portion of the quantum dots being adhered quantum dots. The method also includes peeling the patterning stamp from the substrate with a peeling speed larger than a pre-determined peeling speed to remove the adhered quantum dots from the substrate. A remaining portion of the quantum dots forms a patterned quantum dot layer on the substrate.
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: October 19, 2021
    Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: Seok Kim, Moonsub Shim, Jun Kyu Park, Hohyun Keum, Yiran Jiang
  • Publication number: 20210234135
    Abstract: A stretchable display device comprises a lower substrate, a plurality of island substrates disposed on the lower substrate and spaced apart from each other, a plurality of display elements disposed on the plurality of island substrates, a plurality of connecting lines disposed between each of the plurality of island substrates, an upper substrate disposed on the lower substrate, the plurality of display elements and the plurality of connecting lines, and a polarizing layer disposed on the upper substrate and including a phase delay layer on the upper substrate and a linear polarizing plate on the phase delay layer, wherein the phase delay layer includes a first base polymer, wherein the linear polarizing plate includes a second base polymer, and wherein the first and second base polymers include a same material as the upper substrate.
    Type: Application
    Filed: April 16, 2021
    Publication date: July 29, 2021
    Applicant: LG Display Co., Ltd.
    Inventors: Kihan KIM, Hyokang LEE, Hohyun KEUM
  • Patent number: 11018324
    Abstract: A stretchable display device includes a structure that can minimize damage to a polarizing layer when the stretchable display device is stretched and reduce visibility of external light being reflected to a user by using a polarizing plate having a stretchable characteristic, and the thickness of the stretchable display can be reduced because components disposed under the upper substrate and the polarizing layer are configured to include the same material as the polarizing layer that can be easily stretched in a plurality of directions by alternately disposing stretchable polarizing layers in different directions.
    Type: Grant
    Filed: October 4, 2019
    Date of Patent: May 25, 2021
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Kihan Kim, Hyokang Lee, Hohyun Keum
  • Patent number: 10804103
    Abstract: A method for microassembly of heterogeneous materials comprises contacting a stamp with an ink disposed on a donor substrate to form an inked stamp, where the ink is reversibly bound to the stamp. The inked stamp is stamped onto a receiving substrate or onto an object on the receiving substrate, and the stamp is removed, thereby transferring the ink to the receiving substrate. The ink and the receiving substrate or the ink and the object are thermally joined, thereby forming a microassembly of heterogeneous materials. The ink may comprise a first material and the receiving substrate or the object may comprise a second material different from the first material.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: October 13, 2020
    Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: Seok Kim, Zining Yang, Hohyun Keum
  • Publication number: 20200111996
    Abstract: A stretchable display device comprises a plurality of island substrates in which a plurality of pixels is defined and spaced apart from each other; a lower substrate disposed under the plurality of island substrates; a connecting line electrically connecting pads disposed at adjacent island substrates of the plurality of island substrates; and a polarizing layer disposed on the lower substrate and the plurality of island substrates, wherein the polarizing layer includes a phase delay layer having a reactive mesogen dispersed in a first base polymer, and a linear polarizing plate disposed on the phase delay layer and having a dye dispersed in a second base polymer.
    Type: Application
    Filed: October 4, 2019
    Publication date: April 9, 2020
    Applicant: LG Display Co., Ltd.
    Inventors: Kihan KIM, Hyokang LEE, Hohyun KEUM
  • Publication number: 20200091375
    Abstract: The present disclosure describes one or more embodiment of a method for creating a patterned quantum dot layer. The method includes bringing a patterning stamp in contact with a layer of quantum dots disposed on a substrate, the patterning stamp comprising a patterned photoresist layer disposed on an elastomer layer, such that a portion of the quantum dots in contact with the patterned photoresist layer adheres to the patterning stamp, the portion of the quantum dots being adhered quantum dots. The method also includes peeling the patterning stamp from the substrate with a peeling speed larger than a pre-determined peeling speed to remove the adhered quantum dots from the substrate. A remaining portion of the quantum dots forms a patterned quantum dot layer on the substrate.
    Type: Application
    Filed: September 17, 2019
    Publication date: March 19, 2020
    Inventors: Seok KIM, Moonsub SHIM, Jun Kyu PARK, Hohyun KEUM, Yiran JIANG
  • Publication number: 20200037442
    Abstract: A stretchable display device comprises a display panel that includes a stretchable substrate where a plurality of emission elements is disposed, wherein the stretchable substrate is stretchable in at least one of a first direction and a second direction perpendicular to the first direction; a printed circuit film that includes a first driving circuit chip generating a drive control signal to be applied to the display panel and a second driving circuit chip receiving image data from outside and transferring the image data to the first driving circuit chip, wherein the printed circuit film is stretchable in at least one of the first direction and the second direction with respect to a stretch direction of the display panel.
    Type: Application
    Filed: July 23, 2019
    Publication date: January 30, 2020
    Applicant: LG Display Co., Ltd.
    Inventors: Hohyun KEUM, Mingyu KANG
  • Publication number: 20200026184
    Abstract: A method of making a bonded polymeric assembly by transfer printing comprises contacting a stamp with a solid-phase ink comprising a photoresist to form an inked stamp, where the solid-phase ink is reversibly bound to the stamp. The inked stamp is aligned with an object comprising the photoresist and is stamped onto the object. The stamp is then removed, thereby transferring the solid-phase ink onto the object. The solid-phase ink is thermally joined with the object. Thus, a bonded polymeric assembly comprising a bonded joint between the solid-phase ink and the object is formed.
    Type: Application
    Filed: July 18, 2019
    Publication date: January 23, 2020
    Inventors: Seok Kim, Hohyun Keum, Jun Kyu Park
  • Publication number: 20190006180
    Abstract: A method for microassembly of heterogeneous materials comprises contacting a stamp with an ink disposed on a donor substrate to form an inked stamp, where the ink is reversibly bound to the stamp. The inked stamp is stamped onto a receiving substrate or onto an object on the receiving substrate, and the stamp is removed, thereby transferring the ink to the receiving substrate. The ink and the receiving substrate or the ink and the object are thermally joined, thereby forming a microassembly of heterogeneous materials. The ink may comprise a first material and the receiving substrate or the object may comprise a second material different from the first material.
    Type: Application
    Filed: June 29, 2018
    Publication date: January 3, 2019
    Inventors: Seok Kim, Zining Yang, Hohyun Keum