Patents by Inventor Seung Kwang Roh

Seung Kwang Roh 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: 11980054
    Abstract: A display apparatus including a heteromorphy lens disposed on a path of light emitted from a light-emitting device, a side surface of the heteromorphy lens toward a first direction has a shape different from a side surface of the heteromorphy lens toward a second direction perpendicular to the first direction, so that light can be condensed in the first direction and diffused in the second direction due to the heteromorphy lens, and the reduction in luminance can be minimized, and the viewing angle can be limited.
    Type: Grant
    Filed: April 19, 2021
    Date of Patent: May 7, 2024
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Woo Chul Choi, Seung Kwang Roh
  • Publication number: 20230209859
    Abstract: An organic light emitting diode includes a first emitting part including a first emitting material layer (EML) and a first electron transporting layer (ETL), a second emitting part including a second EML and between the first emitting part and the second electrode, an n-type charge generation layer (CGL) contacting the first ETL and between the first ETL and the second emitting part, and a p-type CGL contacting the n-type CGL and between the n-type CGL and the second emitting part. The first ETL includes a first compound, and the n-type CGL includes a second compound and an n-type dopant. A lowest unoccupied molecular orbital (LUMO) energy level of the first compound can be higher than a LUMO energy level of the second compound.
    Type: Application
    Filed: November 4, 2022
    Publication date: June 29, 2023
    Applicant: LG Display Co., Ltd.
    Inventors: Jeong-Dae SEO, Shin-Han KIM, Min-Surk HYUNG, Kyu-Il HAN, Jin-Ho PARK, Seung-Kwang ROH, Sun-Kap KWON
  • Publication number: 20230107166
    Abstract: The present disclosure relates to a heterocyclic compound being represented by Formula, an organic light emitting device including the heterocyclic compound and an organic light emitting display device including the organic light emitting device. The organic heterocyclic is included in an organic material layer of the organic light emitting device.
    Type: Application
    Filed: April 14, 2022
    Publication date: April 6, 2023
    Applicants: LG DISPLAY CO., LTD., LT Materials Co., Ltd.
    Inventors: Sang-Beom KIM, Young-Jun YU, Seon-Keun YOO, Seung-Kwang ROH, Woo-Chul CHOI, Ji-Ho BAEK, Kyung-Hoon LEE, Ki-Min LIM, Dong-Jun KIM, Young-Seok NO, Hyun-Joo LEE, Eui-Jeong CHOI
  • Publication number: 20220209196
    Abstract: A display apparatus including a heteromorphy lens disposed on a path of light emitted from a light-emitting device, a side surface of the heteromorphy lens toward a first direction has a shape different from a side surface of the heteromorphy lens toward a second direction perpendicular to the first direction, so that light can be condensed in the first direction and diffused in the second direction due to the heteromorphy lens, and the reduction in luminance can be minimized, and the viewing angle can be limited.
    Type: Application
    Filed: April 19, 2021
    Publication date: June 30, 2022
    Applicant: LG Display Co., Ltd.
    Inventors: Woo Chul CHOI, Seung Kwang ROH
  • Patent number: 11335876
    Abstract: Disclosed are an organic light emitting diode, an organic light emitting diode display device and a display device for vehicles using the same. The organic light emitting diode may achieve process simplification and reduction in material costs while maintaining high luminance, through structure change.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: May 17, 2022
    Assignee: LG Display Co., Ltd.
    Inventors: Han-Byeol Seok, Kwan-Soo Kim, Eun-Jung Park, Ki-Min Lim, Seung-Kwang Roh, Byung-Soo Kim, Sang-Kyoung Moon, Dong-Il Choi
  • Publication number: 20200006692
    Abstract: Disclosed are an organic light emitting diode, an organic light emitting diode display device and a display device for vehicles using the same. The organic light emitting diode may achieve process simplification and reduction in material costs while maintaining high luminance, through structure change.
    Type: Application
    Filed: June 27, 2019
    Publication date: January 2, 2020
    Inventors: Han-Byeol Seok, Kwan-Soo Kim, Eun-Jung Park, Ki-Min Lim, Seung-Kwang Roh, Byung-Soo Kim, Sang-Kyoung Moon, Dong-Il Choi
  • Patent number: 9688914
    Abstract: Discussed is a liquid crystal material including: a liquid crystal molecule including an alkenyl group; a phenol-based antioxidant; and a light stabilizer for recycling the phenol-based antioxidant.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: June 27, 2017
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Seung-Kwang Roh, Woo-Young Choi
  • Publication number: 20150002797
    Abstract: The present invention provides a liquid crystal material including: a liquid crystal molecule including an alkenyl group; a phenol-based antioxidant; and a light stabilizer for recycling the phenol-based antioxidant.
    Type: Application
    Filed: May 30, 2014
    Publication date: January 1, 2015
    Applicant: LG Display Co., Ltd.
    Inventors: Seung-Kwang ROH, Woo-Young CHOI
  • Patent number: 8237903
    Abstract: An LCD device includes plurality of gate lines and data lines crossing each other to define pixel regions on a substrate. A thin film transistor (TFT) resides at a crossing portion of the gate lines and the data lines and a pixel electrode is electrically connected with the TFT. The TFT includes a gate electrode, a gate insulation layer on the gate electrode and a semiconductor layer on the gate insulation layer. A portion of the data line and the semiconductor layer form a composite layer between adjacent pixel electrodes in which a line width of data line is the same as a line width of semiconductor layer. A method of fabricating the LCD device includes etching a passivation layer using a mask pattern and etching the semiconductor layer using the mask pattern and a portion of the data line as an etch mask to form the composite layer.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: August 7, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Jung Il Lee, Seung Kwang Roh
  • Publication number: 20110300655
    Abstract: An LCD device includes plurality of gate lines and data lines crossing each other to define pixel regions on a substrate. A thin film transistor (TFT) resides at a crossing portion of the gate lines and the data lines and a pixel electrode is electrically connected with the TFT. The TFT includes a gate electrode, a gate insulation layer on the gate electrode and a semiconductor layer on the gate insulation layer. A portion of the data line and the semiconductor layer form a composite layer between adjacent pixel electrodes in which a line width of data line is the same as a line width of semiconductor layer. A method of fabricating the LCD device includes etching a passivation layer using a mask pattern and etching the semiconductor layer using the mask pattern and a portion of the data line as an etch mask to form the composite layer.
    Type: Application
    Filed: August 16, 2011
    Publication date: December 8, 2011
    Inventors: Jung Il Lee, Seung Kwang Roh
  • Patent number: 8018564
    Abstract: An LCD device includes plurality of gate lines and data lines crossing each other to define pixel regions on a substrate. A thin film transistor (TFT) resides at a crossing portion of the gate lines and the data lines and a pixel electrode is electrically connected with the TFT. The TFT includes a gate electrode, a gate insulation layer on the gate electrode and a semiconductor layer on the gate insulation layer. A portion of the data line and the semiconductor layer form a composite layer between adjacent pixel electrodes in which a line width of data line is the same as a line width of semiconductor layer. A method of fabricating the LCD device includes etching a passivation layer using a mask pattern and etching the semiconductor layer using the mask pattern and a portion of the data line as an etch mask to form the composite layer.
    Type: Grant
    Filed: June 22, 2007
    Date of Patent: September 13, 2011
    Assignee: LG Display Co., Ltd.
    Inventors: Jung Il Lee, Seung Kwang Roh
  • Publication number: 20080143909
    Abstract: An LCD device includes plurality of gate lines and data lines crossing each other to define pixel regions on a substrate. A thin film transistor (TFT) resides at a crossing portion of the gate lines and the data lines and a pixel electrode is electrically connected with the TFT. The TFT includes a gate electrode, a gate insulation layer on the gate electrode and a semiconductor layer on the gate insulation layer. A portion of the data line and the semiconductor layer form a composite layer between adjacent pixel electrodes in which a line width of data line is the same as a line width of semiconductor layer. A method of fabricating the LCD device includes etching a passivation layer using a mask pattern and etching the semiconductor layer using the mask pattern and a portion of the data line as an etch mask to form the composite layer.
    Type: Application
    Filed: June 22, 2007
    Publication date: June 19, 2008
    Inventors: Jung Il Lee, Seung Kwang Roh