Patents by Inventor Seung-Kyu Choi

Seung-Kyu Choi 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: 9136427
    Abstract: Exemplary embodiments of the present invention disclose a light emitting diode including an n-type contact layer doped with silicon, a p-type contact layer, an active region disposed between the n-type contact layer and the p-type contact layer, a superlattice layer disposed between the n-type contact layer and the active region, the superlattice layer including a plurality of layers, an undoped intermediate layer disposed between the superlattice layer and the n-type contact layer, and an electron reinforcing layer disposed between the undoped intermediate layer and the superlattice layer. Only a final layer of the superlattice layer closest to the active region is doped with silicon, and the silicon doping concentration of the final layer is higher than that of the n-type contact layer.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: September 15, 2015
    Assignee: Seoul Viosys Co., Ltd.
    Inventors: Kwang Joong Kim, Chang Suk Han, Kyung Hee Ye, Seung Kyu Choi, Ki Bum Nam, Nam Yoon Kim, Kyung Hae Kim, Ju Hyung Yoon
  • Publication number: 20150221822
    Abstract: Exemplary embodiments of the present invention disclose a light emitting diode including an n-type contact layer doped with silicon, a p-type contact layer, an active region disposed between the n-type contact layer and the p-type contact layer, a superlattice layer disposed between the n-type contact layer and the active region, the superlattice layer including a plurality of layers, an undoped intermediate layer disposed between the superlattice layer and the n-type contact layer, and an electron reinforcing layer disposed between the undoped intermediate layer and the superlattice layer. Only a final layer of the super lattice layer closest to the active region is doped with silicon, and the silicon doping concentration of the final layer is higher than that of the n-type contact layer.
    Type: Application
    Filed: April 17, 2015
    Publication date: August 6, 2015
    Inventors: Kwang Joong Kim, Chang Suk Han, Kyung Hee Ye, Seung Kyu Choi, Ki Bum Nam, Nam Yoon Kim, Kyung Hae Kim, Ju Hyung Yoon
  • Patent number: 9076896
    Abstract: A method of fabricating a nonpolar gallium nitride-based semiconductor layer is provided. The method is a method of fabricating a nonpolar gallium nitride layer using metal organic chemical vapor deposition, and includes disposing a gallium nitride substrate with an m-plane growth surface within a chamber, raising a substrate temperature to a GaN growth temperature by heating the substrate, and growing a gallium nitride layer on the gallium nitride substrate by supplying a Ga source gas, an N source gas, and an ambient gas into the chamber at the growth temperature. The supplied ambient gas contains N2 and does not contain H2.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: July 7, 2015
    Assignee: Seoul Viosys Co., Ltd.
    Inventors: Seung Kyu Choi, Chae Hon Kim, Jung Whan Jung
  • Publication number: 20150115223
    Abstract: Disclosed are semiconductor devices and methods of manufacturing the same. The semiconductor device includes: a first conductive type semiconductor layer including a first lower conductive type semiconductor layer and a first upper conductive type semiconductor layer; a V-pit passing through at least one portion of the first upper conductive type semiconductor layer; a second conductive type semiconductor layer placed over the first conductive type semiconductor and filling the V-pit; and an active layer interposed between the first and second conductive type semiconductor layers with the V-pit passing through the active layer. The first upper conductive type semiconductor layer has a higher defect density than the first lower conductive type semiconductor layer and includes a V-pit generation layer comprising a starting point of the V-pit.
    Type: Application
    Filed: October 28, 2014
    Publication date: April 30, 2015
    Inventors: Woo Chul Kwak, Seung Kyu Choi, Chae Hon Kim, Jung Whan Jung, Yong Hyun Baek, Sam Seok Jang, Su Youn Hong, Mi Gyeong Jeong
  • Publication number: 20150091047
    Abstract: Disclosed are a method of growing a nitride semiconductor, a method of manufacturing a template for semiconductor fabrication and a method of manufacturing a semiconductor light emitting device using the same. The method of manufacturing a semiconductor light emitting device includes: preparing a growth substrate having a defect aggregation region; growing a first nitride semiconductor layer over the growth substrate; growing a second nitride semiconductor layer over the first nitride semiconductor layer; growing a third nitride semiconductor layer over the second nitride semiconductor layer; growing an active layer over the third nitride semiconductor layer; and forming a second conductive type semiconductor layer over the active layer. Accordingly, semiconductor layers grown on the template can have excellent crystallinity.
    Type: Application
    Filed: September 29, 2014
    Publication date: April 2, 2015
    Inventors: Seung Kyu Choi, Woo Chul Kwak, Chae Hon Kim, Jung Whan Jung, Sam Seok Jang
  • Publication number: 20140361247
    Abstract: Disclosed herein is a light emitting diode (LED) including: a gallium nitride substrate; a gallium nitride-based first contact layer disposed on the gallium nitride substrate; a gallium nitride-based second contact layer; an active layer having a multi-quantum well structure and disposed between the first and second contact layers; and a super-lattice layer having a multilayer structure and disposed between the first contact layer and the active layer. By employing the gallium nitride substrate, the crystallinity of the semiconductor layers can be improved, and in addition, by disposing the super-lattice layer between the first contact layer and the active layer, a crystal defect that may be generated in the active layer can be prevented.
    Type: Application
    Filed: August 25, 2014
    Publication date: December 11, 2014
    Applicants: SEOUL VIOSYS CO., LTD., MITSUBISHI CHEMICAL CORPORATION
    Inventors: Seung Kyu CHOI, Chae Hon Kim, Jung Whan Jung, Ki Bum Nam, Kenji Shimoyama, Kaori Kurihara
  • Patent number: 8890899
    Abstract: A monochrome light emitting display device and a method for fabricating the same are disclosed, in which a pixel structure of a monochrome light emitting display device is changed to improve a contrast ratio and resolution and at the same time color shift is prevented from occurring, so as to display clearer image. The monochrome light emitting display device comprises a display panel having unit pixels of first and second sub-pixels arranged in a matrix arrangement to display a monochrome image; gate and data drivers respectively driving gate lines and data lines of the display panel; and a timing controller aligning externally input RGB data to be suitable for driving of the display panel to supply the RGB data to the data driver and generating data and gate control signals to control the data and gate drivers.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: November 18, 2014
    Assignee: LG Display Co., Ltd.
    Inventors: Se-Hee Lee, Byung-Chul Ahn, Seung-Kyu Choi, Nam-Yang Lee, Seok-Jong Lee
  • Patent number: 8760595
    Abstract: Fringe field switching (FFS) mode liquid crystal display device and method for fabricating the same, are discussed, the device including a gate line formed in one direction on a surface of a first substrate; a data line formed on the first substrate, and crossed with the gate line to thereby define a pixel region; a thin-film transistor formed on the first substrate, and formed at an intersection of the gate line and the data line; an insulating layer having an opening portion located at an upper portion of the thin-film transistor to expose at least a gate portion of the thin-film transistor; a pixel electrode formed at an upper portion of the insulating layer, and connected to the exposed thin-film transistor; a passivation layer formed at the upper portion of the insulating layer; and common electrodes formed at an upper portion of the passivation layer and separated from one another.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: June 24, 2014
    Assignee: LG Display Co., Ltd.
    Inventors: Seung-Kyu Choi, Sun-Hwa Lee, Dong-Su Shin, Cheol-Hwan Lee, Won-Keun Park
  • Publication number: 20140162437
    Abstract: Exemplary embodiments of the present invention relate to a method of growing gallium nitride-based semiconductor layers through metal-organic chemical vapor deposition, including disposing a substrate in a chamber, growing a first conductivity-type gallium nitride-based semiconductor layer on the substrate at a first chamber pressure, growing a gallium nitride-based active layer on the first conductivity-type gallium nitride-based semiconductor layer at a second chamber pressure higher than the first chamber pressure, and growing a second conductivity-type gallium nitride-based semiconductor layer on the active layer at a third chamber pressure lower than the second chamber pressure.
    Type: Application
    Filed: October 17, 2013
    Publication date: June 12, 2014
    Applicant: SEOUL VIOSYS CO., LTD.
    Inventors: Seung Kyu CHOI, Woo Chul KWAK, Chae Hon KIM, Jung Whan JUNG
  • Publication number: 20140151713
    Abstract: Exemplary embodiments of the present invention provide a method of growing a nitride semiconductor layer including growing a gallium nitride-based defect dispersion suppressing layer on a gallium nitride substrate including non-defect regions and a defect region disposed between the non-defect regions, and growing a gallium nitride semiconductor layer on the defect dispersion suppressing layer.
    Type: Application
    Filed: November 27, 2013
    Publication date: June 5, 2014
    Applicant: SEOUL VIOSYS CO., LTD.
    Inventors: Woo Chul Kwak, Seung Kyu Choi, Jae Hoon Song, Chae Hon Kim, Jung Whan Jung
  • Publication number: 20130248818
    Abstract: A method of fabricating a nonpolar gallium nitride-based semiconductor layer is provided. The method is a method of fabricating a nonpolar gallium nitride layer using metal organic chemical vapor deposition, and includes disposing a gallium nitride substrate with an m-plane growth surface within a chamber, raising a substrate temperature to a GaN growth temperature by heating the substrate, and growing a gallium nitride layer on the gallium nitride substrate by supplying a Ga source gas, an N source gas, and an ambient gas into the chamber at the growth temperature. The supplied ambient gas contains N2 and does not contain H2.
    Type: Application
    Filed: March 21, 2013
    Publication date: September 26, 2013
    Applicant: Seoul Opto Device Co., Ltd.
    Inventors: Seung Kyu CHOI, Chae Hon KIM, Jung Whan JUNG
  • Patent number: 8470626
    Abstract: Exemplary embodiments of the present invention relate to a method of fabricating a light emitting diode (LED). According to an exemplary embodiment of the present invention, the method includes growing a first GaN-based semiconductor layer on a substrate at a first temperature by supplying a chamber with a nitride source gas and a first metal source gas, stopping the supply of the first metal source gas and maintaining the first temperature for a first time period after stopping the supply of the first metal source gas, decreasing the temperature of the substrate to the a second temperature after the first time period elapses, growing an active layer of the first GaN-based semiconductor layer at the second temperature by supplying the chamber with a second metal source gas.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: June 25, 2013
    Assignee: Seoul Opto Device Co., Ltd.
    Inventors: Kwang Joong Kim, Chang Suk Han, Seung Kyu Choi, Ki Bum Nam, Nam Yoon Kim, Kyung Hae Kim, Ju Hyung Yoon
  • Publication number: 20130063673
    Abstract: Fringe field switching (FFS) mode liquid crystal display device and method for fabricating the same, are discussed, the device including a gate line formed in one direction on a surface of a first substrate; a data line formed on the first substrate, and crossed with the gate line to thereby define a pixel region; a thin-film transistor formed on the first substrate, and formed at an intersection of the gate line and the data line; an insulating layer having an opening portion located at an upper portion of the thin-film transistor to expose at least a gate portion of the thin-film transistor; a pixel electrode formed at an upper portion of the insulating layer, and connected to the exposed thin-film transistor; a passivation layer formed at the upper portion of the insulating layer; and common electrodes formed at an upper portion of the passivation layer and separated from one another.
    Type: Application
    Filed: August 22, 2012
    Publication date: March 14, 2013
    Applicant: LG DISPLAY CO., LTD.
    Inventors: Seung-Kyu CHOI, Sun-Hwa LEE, Dong-Su SHIN, Cheol-Hwan LEE, Won-Keun PARK
  • Patent number: 8357924
    Abstract: Exemplary embodiments of the present invention disclose a light emitting diode including an n-type contact layer doped with silicon, a p-type contact layer, an active region disposed between the n-type contact layer and the p-type contact layer, a superlattice layer disposed between the n-type contact layer and the active region, the superlattice layer including a plurality of layers, an undoped intermediate layer disposed between the superlattice layer and the n-type contact layer, and an electron reinforcing layer disposed between the undoped intermediate layer and the superlattice layer. Only a final layer of the superlattice layer closest to the active region is doped with silicon, and the silicon doping concentration of the final layer is higher than that of the n-type contact layer.
    Type: Grant
    Filed: January 3, 2011
    Date of Patent: January 22, 2013
    Assignee: Seoul Opto Device Co., Ltd.
    Inventors: Kwang Joong Kim, Chang Suk Han, Kyung Hee Ye, Seung Kyu Choi, Ki Bum Nam, Nam Yoon Kim, Kyung Hae Kim, Ju Hyung Yoon
  • Publication number: 20120142134
    Abstract: Exemplary embodiments of the present invention relate to a method of fabricating a light emitting diode (LED). According to an exemplary embodiment of the present invention, the method includes growing a first GaN-based semiconductor layer on a substrate at a first temperature by supplying a chamber with a nitride source gas and a first metal source gas, stopping the supply of the first metal source gas and maintaining the first temperature for a first time period after stopping the supply of the first metal source gas, decreasing the temperature of the substrate to the a second temperature after the first time period elapses, growing an active layer of the first GaN-based semiconductor layer at the second temperature by supplying the chamber with a second metal source gas.
    Type: Application
    Filed: June 1, 2011
    Publication date: June 7, 2012
    Applicant: SEOUL OPTO DEVICE CO., LTD.
    Inventors: Kwang Joong KIM, Chang Suk HAN, Seung Kyu CHOI, Ki Bum NAM, Nam Yoon KIM, Kyung Hae KIM, Ju Hyung YOON
  • Publication number: 20120037881
    Abstract: Exemplary embodiments of the present invention disclose a light emitting diode including an n-type contact layer doped with silicon, a p-type contact layer, an active region disposed between the n-type contact layer and the p-type contact layer, a superlattice layer disposed between the n-type contact layer and the active region, the superlattice layer including a plurality of layers, an undoped intermediate layer disposed between the superlattice layer and the n-type contact layer, and an electron reinforcing layer disposed between the undoped intermediate layer and the superlattice layer. Only a final layer of the superlattice layer closest to the active region is doped with silicon, and the silicon doping concentration of the final layer is higher than that of the n-type contact layer.
    Type: Application
    Filed: January 3, 2011
    Publication date: February 16, 2012
    Applicant: SEOUL OPTO DEVICE CO., LTD.
    Inventors: Kwang Joong KIM, Chang Suk HAN, Kyung Hee YE, Seung Kyu CHOI, Ki Bum NAM, Nam Yoon KIM, Kyung Hae KIM, Ju Hyung YOON
  • Publication number: 20110032277
    Abstract: A monochrome light emitting display device and a method for fabricating the same are disclosed, in which a pixel structure of a monochrome light emitting display device is changed to improve a contrast ratio and resolution and at the same time color shift is prevented from occurring, so as to display clearer image. The monochrome light emitting display device comprises a display panel having unit pixels of first and second sub-pixels arranged in a matrix arrangement to display a monochrome image; gate and data drivers respectively driving gate lines and data lines of the display panel; and a timing controller aligning externally input RGB data to be suitable for driving of the display panel to supply the RGB data to the data driver and generating data and gate control signals to control the data and gate drivers.
    Type: Application
    Filed: December 23, 2009
    Publication date: February 10, 2011
    Inventors: Se-Hee LEE, Byung-Chul Ahn, Seung-Kyu Choi, Nam-Yang Lee, Seok-Jong Lee
  • Patent number: 7646439
    Abstract: This invention relates to a liquid crystal display and a fabricating method thereof that provides a uniform parasitic capacity of a thin film transistor. In a liquid crystal display and a fabricating method thereof according to the present invention, a source electrode of the thin film transistor is connected to the data line and a drain electrode of the thin film transistor is inserted into a hollowed part of the source electrode in the data line direction.
    Type: Grant
    Filed: December 23, 2002
    Date of Patent: January 12, 2010
    Assignee: LG Display Co., Ltd.
    Inventors: Seung Kyu Choi, Sang Moo Song
  • Patent number: 7643121
    Abstract: A line-on-glass (LOG) type liquid crystal display device prevents deterioration in picture quality due to line resistances in LOG signal lines includes a display area having liquid crystal cells arranged at crossings of gate and data lines, a storage capacitor arranged within each of the liquid crystal cells for maintaining charged pixel voltages, and a dummy gate line. A line-on-glass type signal line group outside the display area transmits driving signals to the gate driver integrated circuits for driving the gate lines. A first signal line outside the display area is mounted on gate tape carrier packages. A second signal line connects the first gate low voltage and dummy lines, is insulated from, and crosses the gate lines outside the display area. A third signal line connects the first gate low voltage line and the dummy gate line to connect the first and second gate low voltage lines in parallel.
    Type: Grant
    Filed: December 23, 2002
    Date of Patent: January 5, 2010
    Assignee: LG Display Co., Ltd.
    Inventors: Seung Kyu Choi, Kwang Soon Park, Chul Woo Im, Sang Moo Song, Choel Min Woo
  • Patent number: 7576809
    Abstract: A fabricating method of an array substrate for a liquid crystal display device includes forming a gate line on a substrate; forming an ohmic contact layer on the substrate; forming a data line and source and drain electrodes on the ohmic contact layer, the source electrode being connected to the data line, the source and drain electrodes facing and spaced apart from each other; forming a passivation layer having a contact hole on the data line and the source and drain electrodes, the contact hole exposing a portion of a side surface of the drain electrode; and forming a pixel electrode on the passivation layer, the pixel electrode being connected to the drain electrode through the contact hole.
    Type: Grant
    Filed: February 7, 2006
    Date of Patent: August 18, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Seung-Kyu Choi, Young-Hun Ha, Jong-Woo Kim