Patents by Inventor Jun-won Chang

Jun-won 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: 7474370
    Abstract: A vertically aligned liquid crystal display (VA-LCD) according to one embodiment has liquid crystal cells in which liquid crystals with a negative dielectric anisotropy are filled and which is provided between a first polarizer and a second polarizer, whose absorption axes are perpendicular to each other. The VA-LCD includes a sheet of +A plate and a sheet of ?C plate, disposed between the first polarizer and the liquid crystal cells, and a sheet of +A plate disposed between the second polarizer and the liquid crystal cells, where an optical axis of the +A plate near the first polarizer is perpendicular to the absorption axis of the first polarizer, and an optical axis of the +A plate near the second polarizer is parallel with the absorption axis of the second polarizer, and where a thickness retardation value of the ?C plate is in the range of ?500 nm to ?30 nm for a wavelength of 550 nm.
    Type: Grant
    Filed: November 14, 2005
    Date of Patent: January 6, 2009
    Assignee: LG Chem, Ltd.
    Inventors: Soo-jin Jang, Byoung-kun Jeon, Sergey Belyaev, Jun-won Chang
  • Publication number: 20080204633
    Abstract: This invention provides a vertically aligned liquid crystal display, including a first polarizing plate and a second polarizing plate having absorption axes perpendicular to each other and a vertically aligned panel provided therebetween and including vertically aligned liquid crystals having negative dielectric anisotropy, in which a +A-film and a +C-film are provided between the first polarizing plate and the vertically aligned panel, the +C-film is positioned between the first polarizing plate and the +A-film, and the optic axis of the +A-film is parallel to or perpendicular to the absorption axis of the first polarizing plate. According to this invention, the contrast of the vertically aligned liquid crystal display can be improved at surface-facing angle and tilt angle thereof and the color shift depending on the viewing angle in a dark state can be minimized, thus greatly increasing the viewing angle range of the vertically aligned liquid crystal display.
    Type: Application
    Filed: March 10, 2006
    Publication date: August 28, 2008
    Applicant: LG Chem. Ltd.
    Inventors: Byoung Kun Jeon, Sergey Belyaev, Nikolay Malimonenko, Jun Won Chang, Soo Jin Jang
  • Publication number: 20060182900
    Abstract: The present invention relates to a retardation film having a homeotropic alignment liquid crystal film, a polarizing film, an IPS (In-Plane Switching) mode liquid crystal display and a method for preparing the same. More particularly, the present invention relates to a homeotropic alignment liquid crystal film prepared from a liquid crystal mixed solution containing a polymerizable reactive liquid crystal monomer so as to improve a viewing angle characteristic of an ISP mode liquid crystal display and reduce a color shift; a retardation film prepared by integrating an oriented retardation film and a method for preparing the same; a polarizing film having the retardation film located between a polarizing element or plate and a liquid crystal cell and a method for preparing the same; and an IPS mode liquid crystal display having the polarizing film.
    Type: Application
    Filed: February 14, 2006
    Publication date: August 17, 2006
    Applicant: LG CHEM, LTD.
    Inventors: Eun-Kyung Kim, Moon-Soo Park, Jun-Won Chang, Sin-Young Kim
  • Publication number: 20060103798
    Abstract: Disclosed is a vertically aligned liquid crystal display (VA-LCD) having wider viewing angle and having high contrast at the right angle and tilt angles. According to one embodiment of the present invention, the VA-LCD having liquid crystal cells in which liquid crystals with a negative dielectric anisotropy are filled and which is provided between a first polarizer and a second polarizer, whose absorption axises are perpendicular to each other, includes a sheet of +A plate and a sheet of ?C plate, disposed between the first polarizer and the liquid crystal cells; and a sheet of +A plate disposed between the second polarizer and the liquid crystal cells, wherein an optical axis of the +A plate near the first polarizer is perpendicular to the absorption axis of the first polarizer, and an optical axis of the +A plate near the second polarizer is perpendicular to the absorption axis of the second polarizer.
    Type: Application
    Filed: November 14, 2005
    Publication date: May 18, 2006
    Inventors: Soo-jin Jang, Byoung-kun Jeon, Sergey Belyaev, Jun-won Chang