Patents by Inventor Youn-Gyoung Chang

Youn-Gyoung Chang 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: 7501298
    Abstract: A liquid crystal display (LCD) panel is fabricated with a reduced number of mask processes and includes a thin film transistor (TFT) array substrate and a color filter array substrate. The TFT array substrate includes gate and data lines insulatively crossing each other to define a pixel area, a TFT provided at the crossing of the gate and data lines, a passivation film protecting the TFT, a pixel electrode partially overlapped by the TFT, a gate pad connected to the gate line, and a data pad connected to the data line. The gate line, the gate and data pads, and the pixel electrode include a transparent conductive material. A gate metal material is on the transparent conductive material where the TFT partially overlaps the pixel electrode. The passivation film over the gate and data pads is removed to expose the transparent conductive material included within the gate and data pads.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: March 10, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Byung Chul Ahn, Soon Sung Yoo, Oh Nam Kwon, Youn Gyoung Chang, Heung Lyul Cho, Seung Hee Nam, Jae Young Oh
  • Patent number: 7489369
    Abstract: A method of manufacturing an array substrate for a liquid crystal display device includes forming a gate line, a gate pad and a gate electrode on a substrate through a first mask process, forming a data line, a data pad, a source electrode, a drain electrode and an active layer on the substrate including the gate line, the gate pad and the gate electrode through a second mask process, wherein the data line crosses the gate line to define a pixel region, the source electrode is extended from the data line, the drain electrode is spaced apart from the source electrode, and the active layer is disposed between the gate electrode and the source and drain electrodes, forming a passivation layer on an entire surface of the substrate including the data line, the source electrode and the drain electrode through a third mask process, the passivation layer being etched to expose the substrate in the pixel region, a part of the drain electrode, the gate pad and the data pad, and forming a pixel electrode, a gate pad ter
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: February 10, 2009
    Assignee: LG Display Co. Ltd.
    Inventors: Youn-Gyoung Chang, Heung-Lyul Cho, Soon-Sung Yoo
  • Publication number: 20090001617
    Abstract: Provided are an alignment key, a method for fabricating the alignment key, and a method for fabricating a thin film transistor substrate using the alignment key. The method for fabricating the alignment key includes forming a first metal layer on a base substrate, forming a first alignment key and a first mark portion of a second alignment key by selectively patterning the first metal layer, forming a dielectric on the first metal layer, forming a second metal layer on the dielectric, and forming a second mark portion of the second alignment key on the dielectric by selectively patterning the second metal layer.
    Type: Application
    Filed: June 27, 2008
    Publication date: January 1, 2009
    Inventors: Youn Gyoung Chang, Seung Hee Nam, Nam Kook Kim, Soon Sung Yoo
  • Patent number: 7470932
    Abstract: A liquid crystal display (LCD) panel is fabricated in a simplified process. The LCD panel includes a thin film transistor (TFT) array substrate with a gate and data lines crossing each other to define a pixel area, a TFT at the crossings of the gate and data lines, a protective film, and a pixel electrode connected to the TFT and formed within a pixel opening that is arranged at the pixel area and formed through the protective film and a gate insulating film. A color filter array substrate is joined to the TFT array substrate. A pattern spacer is between the TFT and color filter array substrate and overlaps at least one of the gate line, the data line, and the thin film transistor. A rib is formed from the same layer as the pattern spacer and overlaps the pixel electrode. Liquid crystal material is provided within the LCD panel.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: December 30, 2008
    Assignee: LG Display Co., Ltd.
    Inventors: Soon Sung Yoo, Youn Gyoung Chang, Heung Lyul Cho
  • Publication number: 20080287029
    Abstract: An array substrate device includes a gate line formed on a substrate extending along a first direction having a gate electrode, a data line formed on the substrate extending along a second direction having a data pad disposed apart from a first end of the data line, the data and gate lines defining a pixel region, a gate pad formed on the substrate disposed apart from a first end of the gate line, a thin film transistor formed at a crossing region of the gate and data lines and including the gate electrode, a semiconductor layer, a source electrode, and a drain electrode, a black matrix overlapping the thin film transistor, the gate line, and the data line except for a first portion of the drain electrode, a first pixel electrode at the pixel region contacting the first portion of the drain electrode and the substrate, a color filter on the first pixel electrode at the pixel region, and a second pixel electrode on the color filter contacting the first pixel electrode.
    Type: Application
    Filed: June 11, 2008
    Publication date: November 20, 2008
    Inventors: Youn-Gyoung Chang, Seung-Ryull Park, Woong-Kwon Kim, Jong-Hwae Lee
  • Patent number: 7443463
    Abstract: A liquid crystal display device may include a plurality of LCD modules tiled together and a corresponding microlens on each of the plurality of LCD modules. Each microlens may have a curved portion and a flat portion. Each of the LCD modules may comprise an LCD panel in which a pixel size corresponding to the curved portion of the microlens is smaller than a pixel size corresponding to the flat portion of the microlens. Accordingly, luminance differences are reduced or eliminated.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: October 28, 2008
    Assignee: LG Display Co., Ltd.
    Inventors: Youn Gyoung Chang, Hyun Suk Jin
  • Patent number: 7440041
    Abstract: A method of forming an array substrate for use in a liquid crystal display device includes forming a gate line, a gate pad, and a gate electrode, forming a first gate insulating layer to cover the gate line, the gate pad, and the gate electrode, forming an active layer and an ohmic contact layer on the first gate insulating layer, forming a data line, a data pad, a source electrode, and a drain electrode, forming a second insulating layer to cover the thin film transistor, forming a black matrix on the second insulating layer to cover the thin film transistor, the gate line, and the data line except a first portion of the drain electrode, forming a third insulating layer to cover the black matrix, patterning the first, second, and third insulating layers, forming a first transparent electrode layer to cover the patterned third insulating layer, coating an adhesive color film on the first transparent electrode layer, irradiating a laser to portions of the adhesive color film corresponding to the pixel region,
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: October 21, 2008
    Assignee: LG Display Co., Ltd.
    Inventors: Youn-Gyoung Chang, Seung-Ryull Park
  • Publication number: 20080224141
    Abstract: A method for fabricating an LCD includes: providing a substrate with a thin film transistor (ITT) part defined thereon; forming a metallic film for a gate electrode on the substrate; etching the metallic film through a first printing process to form a gate electrode; sequentially forming a gate insulating layer, a semiconductor layer, and a metallic film for source and drain electrodes on the substrate; selectively etching the metallic film for source and drain electrodes, the semiconductor layer and the gate insulating layer through a second printing process to form a gate insulating layer pattern, a preliminary active pattern and a metallic film pattern which are sequentially stacked such that the gate insulating layer pattern is over-etched from the side of the preliminary active pattern; forming an insulating layer on the substrate with the metallic film pattern; etching the insulating layer to expose the metallic film pattern; forming a transparent conductive film on the metallic film pattern and a remai
    Type: Application
    Filed: December 31, 2007
    Publication date: September 18, 2008
    Inventors: Seung-Hee Nam, Nam-Kook Kim, Soon-Sung Yoo, Youn-Gyoung Chang
  • Patent number: 7411217
    Abstract: A thin film transistor array substrate has a gate electrode of the thin film transistor, a gate line connected to the gate electrode, and a gate pad connected to the gate line; a source/drain pattern including a source electrode and a drain electrode of the thin film transistor, a data line connected to the source electrode, a data pad connected to the data line, a storage electrode formed and superimposed with the gate line; a semiconductor pattern formed in low part of the substrate; a transparent electrode pattern including a pixel electrode connected to the drain electrode and the storage electrode, a gate pad protection electrode covering the gate pad, and a data pad protection electrode covering the data pad; and a protection pattern and a gate insulation pattern stacked in a region other than the region where the transparent electrode pattern is formed.
    Type: Grant
    Filed: November 9, 2006
    Date of Patent: August 12, 2008
    Assignee: LG Display Co., Ltd.
    Inventors: Soon Sung Yoo, Youn Gyoung Chang, Heung Lyul Cho
  • Publication number: 20080184904
    Abstract: Provided are a roller apparatus, a printing method and a method of fabricating an LCD device using the same, which can minimize the number of processes and a printing defect. In the printing method, first patterns are formed on a blanket. The first patterns have different surface energy from that of the blanket, and the blanket is formed around a roller. The roller is rotated and a printing material is dropped to form second patterns on the blanket between the first patterns. The second patterns are transferred from the roller onto a substrate.
    Type: Application
    Filed: December 21, 2007
    Publication date: August 7, 2008
    Inventors: Soon Sung Yoo, Youn Gyoung Chang, Seung Hee Nam, Nam Kook Kim
  • Patent number: 7403254
    Abstract: An in-plane switching liquid crystal display device includes first and second substrates, gate lines and data lines on the first substrate and intersecting each other, a plurality of unit pixels defined by the intersection of the gate and data lines, each unit pixel including a plurality of sub-pixel regions, at least one common electrode and at least one common electrode and at least one pixel electrode alternately arranged in each of the sub-pixel regions to define a first region, an in-plane electric field being generated in the first region, and at least one of the common electrode and the pixel electrode having a first closed-curved surface shape with a hollow center, and a liquid crystal layer between the first substrate and the second substrate.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: July 22, 2008
    Assignee: LG Display Co., Ltd.
    Inventors: Yun-Bok Lee, Sang-Min Jang, Youn-Gyoung Chang, Won-Ho Lee
  • Patent number: 7400366
    Abstract: An array substrate device includes a gate line formed on a substrate extending along a first direction having a gate electrode, a data line formed on the substrate extending along a second direction having a data pad disposed apart from a first end of the data line, the data and gate lines defining a pixel region, a gate pad formed on the substrate disposed apart from a first end of the gate line, a thin film transistor formed at a crossing region of the gate and data lines and including the gate electrode, a semiconductor layer, a source electrode, and a drain electrode, a black matrix overlapping the thin film transistor, the gate line, and the data line except for a first portion of the drain electrode, a first pixel electrode at the pixel region contacting the first portion of the drain electrode and the substrate, a color filter on the first pixel electrode at the pixel region, and a second pixel electrode on the color filter contacting the first pixel electrode.
    Type: Grant
    Filed: January 11, 2007
    Date of Patent: July 15, 2008
    Assignee: LG Display Co., Ltd.
    Inventors: Youn-Gyoung Chang, Seung-Ryull Park, Woong-Kwon Kim, Jong-Hwae Lee
  • Patent number: 7369202
    Abstract: An in plane switching (IPS) mode liquid crystal display (LCD) panel is fabricated with a reduced number of mask processes and includes a thin film transistor (TFT) array substrate with a TFT provided at a crossing of gate and data lines, a protective film protecting the TFT, a pixel electrode connected to the TFT, a common line substantially parallel to the pixel electrode, a common electrode connected to the common line to generate a horizontal electric field with the pixel electrode, and a pad including a transparent conductive material and connected to the gate line, the data line and/or the common line. A color filter array substrate is joined to, and overlaps a portion of, the TFT array substrate. Portions of the protective film where the color filter array substrate which do not overlap the TFT array substrate are removed to expose the transparent conductive material included in the pad.
    Type: Grant
    Filed: October 14, 2004
    Date of Patent: May 6, 2008
    Assignee: LG.Philips LCD Co., Ltd.
    Inventors: Byung Chul Ahn, Soon Sung Yoo, Oh Nam Kwon, Youn Gyoung Chang, Nack Bong Choi, Seung Hee Nam
  • Patent number: 7336336
    Abstract: A substrate has intersecting gate and data lines with a gate insulating film therebetween, a thin film transistor provided at an intersection of the gate and data lines, a pixel electrode connected to the transistor, a pad connected to a signal line via a contact hole and containing a transparent conductive film, and a protective film overlapping a color filter array substrate to expose the film. The contact hole exposes the end of the pad and/or signal line and an adjacent area. A gate electrode, source and drain electrodes, and a contact electrode are formed from first, second, and third conductive layers, respectively. A contact hole exposes the first conductive layer of one transistor and an adjacent portion of the second conductive layer of another transistor. The contact electrode connects the exposed first and second conductive layers. Only three mask processes are used in fabricating the substrate.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: February 26, 2008
    Assignee: LG. Philips Co. Ltd.
    Inventors: Soon Sung Yoo, Youn Gyoung Chang, Heung Lyul Cho, Seung Hee Nam
  • Publication number: 20080043164
    Abstract: An array substrate device includes a gate line formed on a substrate extending along a first direction having a gate electrode, a data line formed on the substrate extending along a second direction having a data pad disposed apart from a first end of the data line, the data and gate lines defining a pixel region, a gate pad formed on the substrate disposed apart from a first end of the gate line, a thin film transistor formed at a crossing region of the gate and data lines and including the gate electrode, a semiconductor layer, a source electrode, and a drain electrode, a black matrix overlapping the thin film transistor, the gate line, and the data line except for a first portion of the drain electrode, a first pixel electrode at the pixel region contacting the first portion of the drain electrode and the substrate, a color filter on the first pixel electrode at the pixel region, and a second pixel electrode on the color filter contacting the first pixel electrode.
    Type: Application
    Filed: August 31, 2007
    Publication date: February 21, 2008
    Inventors: Youn-Gyoung Chang, Seung-Ryull Park, Woong-Kwon Kim, Jong-Hwae Lee
  • Patent number: 7306979
    Abstract: A method of fabricating a thin film transistor substrate for a display device is provided.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: December 11, 2007
    Assignee: LG. Philips LCD Co., Ltd.
    Inventors: Youn Gyoung Chang, Heung Lyul Cho
  • Patent number: 7256076
    Abstract: A manufacturing method of a thin film transistor of a liquid crystal display device using 3-mask includes forming a gate electrode over a substrate, consecutively forming a gate insulating layer and an active layer, forming a first photoresist pattern, removing an active layer formed at a source/drain region, ashing the first photoresist pattern to expose a part of an active region, forming a source/drain electrode, forming a passivation layer, forming a second photoresist pattern that exposes a pixel region over the passivation layer; forming a pixel region by using the second photoresist pattern as a mask, side-etching a part of the passivation layer to expose a part of the drain electrode, forming a pixel electrode material over the second photoresist pattern and the pixel region, and simultaneously removing the second photoresist pattern and the pixel electrode material formed thereon to form a pixel electrode.
    Type: Grant
    Filed: April 1, 2004
    Date of Patent: August 14, 2007
    Assignee: LG.Philips LCD Co., Ltd.
    Inventors: Heung-Lyul Cho, Soon-Sung Yoo, Youn-Gyoung Chang
  • Publication number: 20070153166
    Abstract: A method for fabricating color filter layer of an LCD comprises forming a plurality of black matrixes separated at certain intervals on a color filter substrate, and forming R, G and B color filter layers by using a plurality of needles between the plurality of black matrixes on the color filter substrate.
    Type: Application
    Filed: June 29, 2006
    Publication date: July 5, 2007
    Inventors: Soon-Sung Yoo, Duk-Chul Yun, Oh-Nam Kwon, Youn-Gyoung Chang, Heung-Lyul Cho, Seung-Hee Nam
  • Patent number: 7220611
    Abstract: A liquid crystal display panel including a thin film transistor array substrate structure including, a substrate, a gate line and a data line disposed on the substrate and insulated from each other by a gate insulating pattern, a thin film transistor provided at intersection of the gate and data lines, a protective film disposed to protect the thin film transistor, and a pad structure connected to a respective one of the gate line and data line, the pad structure including a transparent conductive film and a data metal layer; and a color filter array substrate structure joined with the thin film transistor array substrate structure, wherein the protective film is disposed within an area where the color filter array substrate structure overlaps with the thin film transistor array substrate structure, and exposing either the data metal layer or the transparent conductive film along a side portion of the substrate.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: May 22, 2007
    Assignee: LG.Philips LCD Co., Ltd.
    Inventors: Youn-Gyoung Chang, Seung-Hee Nam
  • Publication number: 20070109467
    Abstract: An array substrate device includes a gate line formed on a substrate extending along a first direction having a gate electrode, a data line formed on the substrate extending along a second direction having a data pad disposed apart from a first end of the data line, the data and gate lines defining a pixel region, a gate pad formed on the substrate disposed apart from a first end of the gate line, a thin film transistor formed at a crossing region of the gate and data lines and including the gate electrode, a semiconductor layer, a source electrode, and a drain electrode, a black matrix overlapping the thin film transistor, the gate line, and the data line except for a first portion of the drain electrode, a first pixel electrode at the pixel region contacting the first portion of the drain electrode and the substrate, a color filter on the first pixel electrode at the pixel region, and a second pixel electrode on the color filter contacting the first pixel electrode.
    Type: Application
    Filed: January 11, 2007
    Publication date: May 17, 2007
    Inventors: Youn-Gyoung Chang, Seung-Ryull Park, Woong-Kwon Kim, Jong-Hwae Lee