Patents by Inventor Yongjoon HEO
Yongjoon HEO 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: 11958987Abstract: The present disclosure relates to a cover window for a flexible display device including a polymer substrate including a polyamide resin; and a hard coating layer formed on at least one surface of the polymer substrate, wherein a yellow index of the polymer substrate measured in accordance with STM E 313 is 4.00 or less, and an elastic modulus of the polymer substrate measured at a strain rate of 12.5 mm/min in accordance with ISO 527-3 is 4 to 9 GPa.Type: GrantFiled: October 25, 2019Date of Patent: April 16, 2024Assignee: LG CHEM, LTD.Inventors: Jin Young Park, Bi Oh Ryu, Young Ji Tae, Youngseok Park, Yongjoon Heo, Yeongrae Chang
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Publication number: 20230407026Abstract: The present disclosure relates to a protecting film for a cover window of a flexible display device in which a first hard coating layer containing 3 parts by weight or less of inorganic particles based on 100 parts by weight of a binder resin; a second hard coating layer containing 10 to 45 parts by weight of inorganic particles based on 100 parts by weight of a binder resin; and a light-transmitting substrate are sequentially laminated, wherein the first hard coating layer and the second hard coating layer have a specific thickness ratio, a cover window and a display device including the same.Type: ApplicationFiled: January 15, 2021Publication date: December 21, 2023Applicant: LG CHEM, LTD.Inventors: Hanna LEE, Inkyu LEE, Yeongrae CHANG, Jin Young PARK, Yongjoon HEO
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Publication number: 20220171099Abstract: The present disclosure relates to a cover window for a flexible display device comprising: a light-transmitting substrate; and a first hard coating layer and a second hard coating layer which are formed on both sides of the light-transmitting substrate, respectively, wherein each of the first hard coating layer and the second hard coating layer has IR spectra in which a ratio of the amide C?O peak to the ester C?O peak is in a predetermined range, and a flexible display device including the cover window for a flexible display device.Type: ApplicationFiled: May 15, 2020Publication date: June 2, 2022Applicant: LG CHEM, LTD.Inventors: Jin Young PARK, Hanna LEE, Kyung Moon KO, Yongjoon HEO, Yeongrae CHANG, Jong Soo DO
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Patent number: 11292888Abstract: A photopolymerizable composition including: a polymer matrix or a precursor thereof containing a reaction product of an acrylate-based polyol and a compound containing at least one isocyanate group; a photoreactive monomer; and a non-reactive fluoro compound and a photoinitiator; a hologram recording medium produced from the composition; an optical element including the hologram recording medium; and a method of recording a hologram using the photopolymerizable composition.Type: GrantFiled: October 16, 2018Date of Patent: April 5, 2022Assignee: LG CHEM, LTD.Inventors: Seok Hoon Jang, Heon Kim, Boo Kyung Kim, Yeong Rae Chang, Yongjoon Heo, Se Hyun Kwon
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Publication number: 20210240226Abstract: The present disclosure relates to a cover window for a flexible display device and a flexible display device including the cover window, wherein the cover window includes a polymer substrate including a polyamideimide block copolymer; and a hard coating layer formed on at least one surface of the polymer substrate and having a pencil hardness of 5H or more under a load of 750 g, and no crack occurs when wound on a mandrel having a diameter of 3 mm.Type: ApplicationFiled: October 25, 2019Publication date: August 5, 2021Applicant: LG CHEM, LTD.Inventors: Jin Young PARK, Yunah YU, Duk Hun JANG, Yongjoon HEO, Yeongrae CHANG
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Patent number: 11079678Abstract: A photopolymer composition comprising a polymer matrix or a precursor thereof including a reaction product between (i) a (meth)acrylate-based (co)polymer in which a silane-based functional group is located in a branched chain and an equivalent weight of the silane-based functional group is 300 g/eq to 2000 g/eq, and (ii) a linear silane crosslinking agent; a photoreactive monomer; and a photoinitiator, a hologram recording medium using the same, an optical element using the hologram recording medium, and a holographic recording method. The photopolymer composition can more easily provide a photopolymer layer having improved durability against temperature and humidity while having a large refractive index modulation value.Type: GrantFiled: September 11, 2018Date of Patent: August 3, 2021Assignee: LG CHEM, LTD.Inventors: Seok Hoon Jang, Heon Kim, Yongjoon Heo, Se Hyun Kwon, Yeong Rae Chang
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Publication number: 20210230449Abstract: The present disclosure relates to a cover window for a flexible display device including a polymer substrate including a polyamide resin; and a hard coating layer formed on at least one surface of the polymer substrate, wherein a yellow index of the polymer substrate measured in accordance with STM E 313 is 4.00 or less, and an elastic modulus of the polymer substrate measured at a strain rate of 12.5 mm/min in accordance with ISO 527-3 is 4 to 9 GPa.Type: ApplicationFiled: October 25, 2019Publication date: July 29, 2021Applicant: LG CHEM, LTD.Inventors: Jin Young PARK, Bi Oh RYU, Young Ji TAE, Youngseok PARK, Yongjoon HEO, Yeongrae CHANG
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Publication number: 20210199856Abstract: The present disclosure provides a cover window for a flexible display device comprising a laminate including a light-transmitting substrate or polymer substrate; and a first hard coating layer and a second hard coating layer each formed on both surfaces of the light-transmitting substrate or the polymer substrate, wherein a ratio of a modulus of the first hard coating layer to the total modulus of the laminate is 1.5 to 2.0, and wherein a surface pencil hardness measured from the first hard coating layer side is 5H or more based on 750 g, and a flexible display device comprising the cover window.Type: ApplicationFiled: May 15, 2020Publication date: July 1, 2021Applicant: LG CHEM, LTD.Inventors: Jin Young PARK, Yongjoon HEO, Yeongrae CHANG
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Patent number: 10847070Abstract: A display device includes a display panel in which a plurality of gate lines, a plurality of data lines, and a plurality of subpixels are disposed; a gate driver circuit driving the plurality of gate lines; and a data driver circuit driving the plurality of data lines, wherein the data driver circuit outputs a detection set voltage to at least one data line among the plurality of data lines during a blank period, and the detection set voltage is higher than a detection reference voltage, and wherein the data driver circuit stops outputting a data voltage to the at least one data line during at least one period of active periods after the blank period if a voltage of the at least one data line which the detection set voltage is supplied to be lower than the detection reference voltage during the blank period.Type: GrantFiled: May 3, 2019Date of Patent: November 24, 2020Assignee: LG DISPLAY CO., LTDInventors: YongDuk Lee, YongJoon Heo
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Publication number: 20200255623Abstract: A photopolymerizable composition including: a polymer matrix or a precursor thereof containing a reaction product of an acrylate-based polyol and a compound containing at least one isocyanate group; a photoreactive monomer; and a non-reactive fluoro compound and a photoinitiator; a hologram recording medium produced from the composition; an optical element including the hologram recording medium; and a method of recording a hologram using the photopolymerizable composition.Type: ApplicationFiled: October 16, 2018Publication date: August 13, 2020Inventors: Seok Hoon JANG, Heon KIM, Boo Kyung KIM, Yeong Rae CHANG, Yongjoon HEO, Se Hyun KWON
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Publication number: 20190340966Abstract: A display device includes a display panel in which a plurality of gate lines, a plurality of data lines, and a plurality of subpixels are disposed; a gate driver circuit driving the plurality of gate lines; and a data driver circuit driving the plurality of data lines, wherein the data driver circuit outputs a detection set voltage to at least one data line among the plurality of data lines during a blank period, and the detection set voltage is higher than a detection reference voltage, and wherein the data driver circuit stops outputting a data voltage to the at least one data line during at least one period of active periods after the blank period if a voltage of the at least one data line which the detection set voltage is supplied to be lower than the detection reference voltage during the blank period.Type: ApplicationFiled: May 3, 2019Publication date: November 7, 2019Applicant: LG DISPLAY CO., LTDInventors: YongDuk LEE, YongJoon HEO
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Publication number: 20190317404Abstract: A photopolymer composition comprising a polymer matrix or a precursor thereof including a reaction product between (i) a (meth)acrylate-based (co)polymer in which a silane-based functional group is located in a branched chain and an equivalent weight of the silane-based functional group is 300 g/eq to 2000 g/eq, and (ii) a linear silane crosslinking agent; a photoreactive monomer; and a photoinitiator, a hologram recording medium using the same, an optical element using the hologram recording medium, and a holographic recording method. The photopolymer composition can more easily provide a photopolymer layer having improved durability against temperature and humidity while having a large refractive index modulation value.Type: ApplicationFiled: September 11, 2018Publication date: October 17, 2019Applicant: LG CHEM, LTD.Inventors: Seok Hoon JANG, Heon KIM, Yongjoon HEO, Se Hyun KWON, Yeong Rae CHANG