Patents by Inventor Sunhwan KIM
Sunhwan KIM 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: 11970613Abstract: Embodiments relate to a polymer film. The polymer film comprises a polymer resin selected from the group consisting of a polyamide-based resin and a polyimide-based resin and has a haze (HZ0) before autoclave treatment of 3% or less and a ?HZ24 represented by Equation 1a of 500% or less.Type: GrantFiled: June 26, 2020Date of Patent: April 30, 2024Assignee: SK MICROWORKS CO., LTD.Inventors: Jung Hee Ki, Sunhwan Kim, Sang Hun Choi, Dae Seong Oh, Han Jun Kim, Jin Woo Lee, Dong Jin Lim
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Patent number: 11873372Abstract: Embodiments relate to a polyamide-imide film that maintains its mechanical properties at least at a certain level under the conditions of high temperatures and low temperatures and is excellent in transparency and folding characteristics, a process for preparing the same, and a cover window comprising the same. The polyamide-imide film comprises a polyamide-imide polymer and has an MOR value defined in Equation 1a of 75% or more.Type: GrantFiled: June 26, 2020Date of Patent: January 16, 2024Assignee: SK MICROWORKS CO., LTD.Inventors: Han Jun Kim, Sunhwan Kim, Dae Seong Oh, Jin Woo Lee, Sang Hun Choi, Jung Hee Ki, Dong Jin Lim
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Publication number: 20230410748Abstract: A display device comprises: a display panel including a light emitting element, a driving transistor providing a driving current to the light emitting element using a high potential driving voltage and switching transistors controlling the driving transistor; a gate driving circuit supplying scan signals to the display panel; a data driving circuit generating a data voltage or a bias voltage using a feedback high potential driving voltage transmitted through a high potential driving voltage feedback line; and a timing controller controlling the gate driving circuit and the data driving circuit so that the data voltage is supplied to the display panel in a first period at a low speed mode which the display panel is driven at predetermined driving frequency less than a frequency of a high speed mode and the bias voltage is supplied to the display panel in a second period at a low speed mode.Type: ApplicationFiled: September 6, 2023Publication date: December 21, 2023Inventors: Won-Seok Song, Bonghwan Kim, Sunhwan Kim, Mirae Shin
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Patent number: 11820893Abstract: Embodiments relate to a polymer film that is excellent in folding characteristics and transparency and maintains excellent mechanical properties even after repeated elongation and shrinkage in the elastic region, a process for preparing the same, and a front panel and a display device comprising the same. The polymer film comprises a polymer resin selected from the group consisting of a polyamide-based resin and a polyimide-based resin and has an MOR0/9 of Equation A of 2% or less.Type: GrantFiled: June 26, 2020Date of Patent: November 21, 2023Assignee: SK Microworks Co., LTD.Inventors: Jung Hee Ki, Sunhwan Kim, Han Jun Kim, Dae Seong Oh, Jin Woo Lee, Sang Hun Choi, Gun Uk Kim
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Patent number: 11820874Abstract: Embodiments relate to a polyamide-based film that is colorless and transparent, is excellent in mechanical properties and optical properties, has a wide angle of view by securing at least a certain level of luminance at various angles, and, in particular, has gloss characteristics similar to those of glass, a process for preparing the same, and a cover window comprising the same. The polyamide-based film comprises a polyamide-based polymer, wherein when the polyamide-based film is placed on a surface light source, light is irradiated from the surface light source, and the luminance value (L0) measured in the normal direction of the surface light source is 100%, the luminance value (L50) measured in the direction of 50° from the normal direction of the surface light source is 25% or more.Type: GrantFiled: June 26, 2020Date of Patent: November 21, 2023Assignee: SK Microworks Co., LTD.Inventors: Sang Hun Choi, Jin Woo Lee, Dae Seong Oh, Jung Hee Ki, Sunhwan Kim, Han Jun Kim, Heung Sik Kim
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Patent number: 11805616Abstract: Embodiments relate to a polyimide-based composite film, which comprises a base film comprising a polyimide-based resin; and a functional layer disposed on the base film, wherein when the side of the functional layer located opposite to the side in contact with the base film is referred to as a first side and when the side of the base film in contact with the functional layer is referred to as a second side, the leveling index represented by Equation 1 is less than 0.75.Type: GrantFiled: July 29, 2020Date of Patent: October 31, 2023Assignees: SK microworks Co., Ltd., SK microworks solutions Co., Ltd.Inventors: Sunhwan Kim, Jung Hee Ki, Jin Woo Lee, Dawoo Jeong, Seung Yong Pyun, Yun Hee Seo
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Patent number: 11780965Abstract: Embodiments relate to a polyamide-imide film that secures excellent tensile toughness and elastic restoring force, and a process for preparing the same. The polyamide-imide film comprises a polyamide-imide polymer formed by polymerizing a diamine compound, a dianhydride compound, and a dicarbonyl compound, wherein the area value up to the yield point derived by the 0.2% off-set method on a stress-strain curve of the polyamide-imide film as measured using a universal testing machine (UTM) is 80 to 150 J/m2.Type: GrantFiled: February 8, 2022Date of Patent: October 10, 2023Assignee: SK microworks Co., Ltd.Inventors: Dawoo Jeong, Sunhwan Kim, Dae Seong Oh, Jin Woo Lee, Dong Jin Lim
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Patent number: 11783774Abstract: A display device comprises: a display panel including a light emitting element, a driving transistor providing a driving current to the light emitting element using a high potential driving voltage and switching transistors controlling the driving transistor; a gate driving circuit supplying scan signals to the display panel; a data driving circuit generating a data voltage or a bias voltage using a feedback high potential driving voltage transmitted through a high potential driving voltage feedback line; and a timing controller controlling the gate driving circuit and the data driving circuit so that the data voltage is supplied to the display panel in a first period at a low speed mode which the display panel is driven at predetermined driving frequency less than a frequency of a high speed mode and the bias voltage is supplied to the display panel in a second period at a low speed mode.Type: GrantFiled: September 20, 2022Date of Patent: October 10, 2023Assignee: LG Display Co., Ltd.Inventors: Won-Seok Song, Bonghwan Kim, Sunhwan Kim, Mirae Shin
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Patent number: 11713378Abstract: The polymer film according to an embodiment comprises at least one polymer resin selected from the group consisting of a polyamide-based resin, a polyimide-based resin, and a polyamide-imide-based resin, and has a haze of 0.6% or less and an in-plane retardation within a specific range for each wavelength band in the visible light region. The polymer film, which has an in-plane retardation within a specific range for each wavelength band in the visible light region, is excellent in transparency and optical properties, and it can remarkably reduce the rainbow phenomenon and improve the reflection appearance.Type: GrantFiled: June 26, 2020Date of Patent: August 1, 2023Assignee: SK MICROWORKS CO., LTD.Inventors: Jung Hee Ki, Sunhwan Kim, Dae Seong Oh, Jin Woo Lee, Sang Hun Choi, Han Jun Kim, Heung Sik Kim
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Patent number: 11702519Abstract: An embodiment can provide a polyamide-imide film, which has particular punching properties, is colorless and transparent and has excellent mechanical properties and optical properties, and a method for preparing same. The polyamide-imide film comprises a polyamide-imide polymer, which is formed by means of polymerizing an aromatic diamine compound, an aromatic dianhydride compound and a dicarbonyl compound, and satisfies the condition of general formula (1) below. General formula (1) 4?X/Y?12 X: the maximum hole diameter (mm) comprising cracks when the film is punched at 10 mm/min using a 2.5 mm spherical tip by means of a UTM compression mode Y: the modulus (GPa) of the film.Type: GrantFiled: February 5, 2018Date of Patent: July 18, 2023Assignee: SKC microworks CO., LTD.Inventors: Dawoo Jeong, Sunhwan Kim, Jin Woo Lee, Dae Seong Oh, Dong Jin Lim
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Publication number: 20230143180Abstract: A display device comprises: a display panel including a light emitting element, a driving transistor providing a driving current to the light emitting element using a high potential driving voltage and switching transistors controlling the driving transistor; a gate driving circuit supplying scan signals to the display panel; a data driving circuit generating a data voltage or a bias voltage using a feedback high potential driving voltage transmitted through a high potential driving voltage feedback line; and a timing controller controlling the gate driving circuit and the data driving circuit so that the data voltage is supplied to the display panel in a first period at a low speed mode which the display panel is driven at predetermined driving frequency less than a frequency of a high speed mode and the bias voltage is supplied to the display panel in a second period at a low speed mode.Type: ApplicationFiled: September 20, 2022Publication date: May 11, 2023Inventors: Won-Seok Song, Bonghwan Kim, Sunhwan Kim, Mirae Shin
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Patent number: 11613615Abstract: Embodiments relate to a polyimide-based composite film, which comprises a base film comprising a polyimide-based resin; and a functional layer disposed on the base film, wherein when the side of the functional layer located opposite to the side in contact with the base film is referred to as a first side and when the side of the base film located opposite to the side in contact with the functional layer is referred to as a second side, the adhesiveness index represented by Equation 1 is 3.5 or less.Type: GrantFiled: July 29, 2020Date of Patent: March 28, 2023Assignees: SKC CO., LTD., SK MIOROWOREC SOLUTIONS CO., LTD.Inventors: Sunhwan Kim, Jung Hee Ki, Jin Woo Lee, Dawoo Jeong, Seung Yong Pyun, Yun Hee Seo
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Publication number: 20220356317Abstract: An embodiment can provide a polyamide-imide film and a method for producing same, the film comprising a polyamide-imide polymer formed by polymerizing an aromatic diamine compound, an aromatic dianhydride compound and a dicarbonyl compound, wherein, in an XRD graph with a section in which 2?=8° to 32° as a baseline, the film shows a peak area of 50% or above around 2?=23° with respect to a peak area seen around 2?=15°.Type: ApplicationFiled: July 12, 2022Publication date: November 10, 2022Inventors: Dae Seong OH, Dawoo JEONG, Sunhwan KIM, Jin Woo LEE, Dong Jin LIM, Kyungeun OH
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Publication number: 20220328841Abstract: Proposed is a method of preparing a cathode active material for a lithium secondary battery, in which the active material is based on xLi2MnO3?(1?X)LiMO2 (M=Ni, Co, and Mn) and coated with carbon on the surface thereof. The method includes preparing an aqueous metal solution by selecting three metals among nickel, cobalt, iron, manganese, and aluminum, mixing a precipitating agent and a coprecipitating agent with the aqueous metal solution, introducing the mixture into a continuous reactor and stirring the mixture to obtain a precursor, and preparing a cathode active material by heat-treating the precursor along with a lithium salt and a heterogeneous element.Type: ApplicationFiled: April 4, 2022Publication date: October 13, 2022Applicant: ENPLUS CO.,LTD.Inventors: Taekyoung KANG, Jongman WOO, Hyojin JEON, Sunhwan KIM
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Patent number: 11437413Abstract: A display device includes a display panel including a display area and a non-display area, a first output pad set, a second output pad set, and a buffer pad set that are disposed in the non-display area, and a path change circuit. In an exemplary embodiment, the path change circuit is configured to change a signal delivery path such that a signal delivered through the first output pad set or the second output pad set is delivered through the buffer pad set, when an enable signal is input.Type: GrantFiled: December 18, 2020Date of Patent: September 6, 2022Assignee: LG Display Co., Ltd.Inventors: Cheolho Lee, Sunhwan Kim
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Patent number: 11433573Abstract: An embodiment can provide a method for producing a polyamide-imide film which is colorless and transparent and has excellent mechanical properties, the method comprising: a step of producing a polyamide-imide polymer solution by polymerizing an aromatic diamine compound, an aromatic dianhydride compound, and a dicarbonyl compound; a step of producing a gel sheet by extruding, casting and drying the polymer solution; and a step of producing a polyamide-imide film by heat-treating the gel sheet, wherein the viscosity of the polymer solution is 100,000 to 500,000 cps, and the polyamide-imide film has a yellowness index of 5 or lower, a haze of 2% or lower, a transmittance of 85% or above and a modulus of 5.0 GPa or above, at a thickness of 20 ?m to 75 ?m.Type: GrantFiled: February 6, 2018Date of Patent: September 6, 2022Assignee: SKC CO., LTD.Inventors: Dae Seong Oh, Dawoo Jeong, Sunhwan Kim, Jin Woo Lee, Dong Jin Lim, Cheol Ho Kim
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Patent number: 11434335Abstract: An embodiment can provide a polyamide-imide film and a method for producing same, the film comprising a polyamide-imide polymer formed by polymerizing an aromatic diamine compound, an aromatic dianhydride compound and a dicarbonyl compound, wherein, in an XRD graph with a section in which 2?=8° to 32° as a baseline, the film shows a peak area of 50% or above around 2?=23° with respect to a peak area seen around 2?=15°.Type: GrantFiled: February 6, 2018Date of Patent: September 6, 2022Assignee: SKC CO., LTD.Inventors: Dae Seong Oh, Dawoo Jeong, Sunhwan Kim, Jin Woo Lee, Dong Jin Lim, Kyungeun Oh
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Patent number: 11365287Abstract: Embodiments relate to a process for preparing a poly(amide-imide) film and a poly(amide-imide) film prepared thereby. The process is capable of preparing a poly(amide-imide) film that is excellent in optical properties and mechanical properties.Type: GrantFiled: December 7, 2018Date of Patent: June 21, 2022Assignee: SKC CO., LTD.Inventors: Sunhwan Kim, Dae Seong Oh, Jin Woo Lee, Dawoo Jeong, Dong Jin Lim, Kyung Won Choi
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Publication number: 20220162388Abstract: Embodiments relate to a polyamide-imide film that secures excellent tensile toughness and elastic restoring force, and a process for preparing the same. The polyamide-imide film comprises a polyamide-imide polymer formed by polymerizing a diamine compound, a dianhydride compound, and a dicarbonyl compound, wherein the area value up to the yield point derived by the 0.2% off-set method on a stress-strain curve of the polyamide-imide film as measured using a universal testing machine (UTM) is 80 to 150 J/m2.Type: ApplicationFiled: February 8, 2022Publication date: May 26, 2022Inventors: Dawoo JEONG, Sunhwan KIM, Dae Seong OH, Jin Woo LEE, Dong Jin LIM
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Patent number: 11339250Abstract: Embodiments provide a polyamide-imide polymer film, which comprises a polyamide-imide polymer formed by polymerizing a diamine compound, a dianhydride compound, and a dicarbonyl compound; and silica particles, wherein the number of aggregates having an average diameter of 150 to 200 nm observed in a cross-section cut in the thickness direction of the polyamide-imide film is less than 0.5/?m2, and a process for preparing the same.Type: GrantFiled: June 26, 2019Date of Patent: May 24, 2022Assignee: SKC CO., LTD.Inventors: Dae Seong Oh, Dawoo Jeong, Sunhwan Kim, Jin Woo Lee, Dong Jin Lim