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).
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Patent number: 11930593Abstract: 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: GrantFiled: November 2, 2021Date of Patent: March 12, 2024Assignee: LG DISPLAY CO., LTD.Inventors: Hohyun Keum, Mingyu Kang
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Patent number: 11652187Abstract: 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: GrantFiled: September 14, 2021Date of Patent: May 16, 2023Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISInventors: Seok Kim, Moonsub Shim, Jun Kyu Park, Hohyun Keum, Yiran Jiang
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Patent number: 11605803Abstract: 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: GrantFiled: April 16, 2021Date of Patent: March 14, 2023Assignee: LG DISPLAY CO., LTD.Inventors: Kihan Kim, Hyokang Lee, Hohyun Keum
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Publication number: 20220163883Abstract: 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: ApplicationFiled: February 11, 2022Publication date: May 26, 2022Inventors: Seok Kim, Hohyun Keum, Jun Kyu Park
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Patent number: 11281096Abstract: 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: GrantFiled: July 18, 2019Date of Patent: March 22, 2022Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISInventors: Seok Kim, Hohyun Keum, Jun Kyu Park
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Publication number: 20220061154Abstract: 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: ApplicationFiled: November 2, 2021Publication date: February 24, 2022Applicant: LG DISPLAY CO., LTD.Inventors: Hohyun KEUM, Mingyu KANG
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Publication number: 20210408325Abstract: 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: ApplicationFiled: September 14, 2021Publication date: December 30, 2021Applicant: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISInventors: Seok KIM, Moonsub SHIM, Jun Kyu PARK, Hohyun KEUM, Yiran JIANG
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Patent number: 11197370Abstract: 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: GrantFiled: July 23, 2019Date of Patent: December 7, 2021Assignee: LG DISPLAY CO., LTD.Inventors: Hohyun Keum, Mingyu Kang
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Patent number: 11152536Abstract: 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: GrantFiled: September 17, 2019Date of Patent: October 19, 2021Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISInventors: Seok Kim, Moonsub Shim, Jun Kyu Park, Hohyun Keum, Yiran Jiang
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Publication number: 20210234135Abstract: 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: ApplicationFiled: April 16, 2021Publication date: July 29, 2021Applicant: LG Display Co., Ltd.Inventors: Kihan KIM, Hyokang LEE, Hohyun KEUM
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Patent number: 11018324Abstract: 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: GrantFiled: October 4, 2019Date of Patent: May 25, 2021Assignee: LG DISPLAY CO., LTD.Inventors: Kihan Kim, Hyokang Lee, Hohyun Keum
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Patent number: 10804103Abstract: 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: GrantFiled: June 29, 2018Date of Patent: October 13, 2020Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISInventors: Seok Kim, Zining Yang, Hohyun Keum
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Publication number: 20200111996Abstract: 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: ApplicationFiled: October 4, 2019Publication date: April 9, 2020Applicant: LG Display Co., Ltd.Inventors: Kihan KIM, Hyokang LEE, Hohyun KEUM
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Publication number: 20200091375Abstract: 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: ApplicationFiled: September 17, 2019Publication date: March 19, 2020Inventors: Seok KIM, Moonsub SHIM, Jun Kyu PARK, Hohyun KEUM, Yiran JIANG
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Publication number: 20200037442Abstract: 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: ApplicationFiled: July 23, 2019Publication date: January 30, 2020Applicant: LG Display Co., Ltd.Inventors: Hohyun KEUM, Mingyu KANG
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Publication number: 20200026184Abstract: 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: ApplicationFiled: July 18, 2019Publication date: January 23, 2020Inventors: Seok Kim, Hohyun Keum, Jun Kyu Park
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Publication number: 20190006180Abstract: 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: ApplicationFiled: June 29, 2018Publication date: January 3, 2019Inventors: Seok Kim, Zining Yang, Hohyun Keum