Patents by Inventor Sung-Eun Cha

Sung-Eun Cha 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).

  • Publication number: 20050105023
    Abstract: The invention is directed to a liquid crystal display and assembly without a contact hole in the reflective layer. By eliminating the contact hole, the overall reflectance of the apparatus is increased. In order to prevent light leakage and afterimage, the invention includes an interface electrode that is strategically positioned over where light leakage occurs. An exemplary device of the invention includes a first electrode, a second electrode, and a liquid crystal layer located between the first electrode and the second electrode. The liquid crystal layer has a reflective region, a transmissive region, and an interface region located between the first region and the second region. The apparatus includes a thin film transistor that is electrically coupled to the second electrode through an electrical coupling in the interface region. The invention also includes a method of making the device.
    Type: Application
    Filed: March 8, 2004
    Publication date: May 19, 2005
    Inventors: Jae-Hyun Kim, Yong-Kyu Jang, Won-Sang Park, Sang-Woo Kim, Young-Ok Cha, Sung-Eun Cha, Jae-Young Lee
  • Publication number: 20050030454
    Abstract: A reflective-transmissive liquid crystal display (LCD) device with an improved display quality is achieved by forming a reflective area and a transmissive area having a cell gap greater than greater than that of the reflective area. A liquid crystal layer is disposed in a liquid crystal cell between the first and second substrates. The liquid crystal molecules are normally aligned at an angle equal to greater than about 45° with respect to a line parallel to the first substrate. The LCD device operates in a normally black mode.
    Type: Application
    Filed: July 9, 2004
    Publication date: February 10, 2005
    Inventors: Yong-Kyu Jang, Won-Sang Park, Jae-Hyun Kim, Sang-Woo Kim, Sung-Eun Cha, Jae-Young Lee
  • Publication number: 20050024563
    Abstract: A liquid crystal display panel includes a liquid crystal layer having a twist angle of ±10 degree. An upper polarizer is disposed over an upper substrate of the liquid crystal display panel, and includes an absorption axis forming at an angle of 47±10 degree in a clockwise direction with respect to a major axis. An upper ?/2 retardation film is disposed between the upper substrate and the upper polarizer, and includes ?nd1 of 260±10 nm and a slow axis forming at an angle of 166±10 degree in the clockwise direction with respect to the absorption axis. An upper ?/4 retardation film is disposed between the upper substrate and the upper ?/2 retardation film, and includes ?nd2 of 140±10 nm and a slow axis forming at an angle of 111±10 degree in the clockwise direction with respect to the absorption axis. Therefore, the optical condition of the optical film assembly is optimized to improve an image display quality.
    Type: Application
    Filed: July 30, 2004
    Publication date: February 3, 2005
    Inventors: Yong-Kyu Jang, Won-Sang Park, Jae-Hyun Kim, Sang-Woo Kim, Sung-Eun Cha, Jae-Young Lee
  • Publication number: 20040218123
    Abstract: In a liquid crystal display apparatus, a lower substrate has a transmissive electrode formed in a transmissive area of a first substrate and a reflective electrode formed in a reflective area of the first substrate. An upper substrate has a second substrate, a first insulating layer formed on the second substrate corresponding to the transmissive area, a common electrode formed on the first insulating layer and the second substrate corresponding to the reflective area, and a second insulating layer formed on the common electrode corresponding to the reflective area. Accordingly, the liquid crystal display apparatus may have a uniform cell gap, thereby improving a reflectance and a transmittance thereof.
    Type: Application
    Filed: April 28, 2004
    Publication date: November 4, 2004
    Applicant: SAMSUNG ELECTRONICS CO., LTD
    Inventors: Won-Sang Park, Kee-Han Uh, Yong-Kyu Jang, Sang-Woo Park, Sang-Woo Kim, Sung-Eun Cha, Jae-Young Lee, Jae-Hyun Kim
  • Publication number: 20040218126
    Abstract: A color filter array panel and a TFT array panel face each other, and a liquid crystal layer is interposed between the two panels such that the liquid crystal molecules of the liquid crystal layer are twisted by 72°. A &lgr;/2 compensation film and a &lgr;/4 compensation film are disposed on outer surfaces of the color filter array panel and the TFT array panel, respectively. Upper and lower polarizers are disposed on the respective compensation films. The &lgr;/2 compensation film and the &lgr;/4 compensation film have predetermined retardations and the drawing axes having predetermined azimuthal angles.
    Type: Application
    Filed: December 22, 2003
    Publication date: November 4, 2004
    Inventors: Jae-Hyun Kim, Sang-Woo Kim, Sung-Eun Cha, Yong-Kyu Jang
  • Publication number: 20040183967
    Abstract: In an LCD apparatus, a reflecting plate, which is formed on a pixel electrode connected to a switching device formed on an array substrate, defines a reflecting area from which a natural light is reflected and a transmitting area through which an artificial light is transmitted. The reflecting plate is partially extended to and overlapped with the transmitting area depending upon a rubbing direction of the array substrate. Thus, the reflective-transmissive type LCD apparatus may prevent occurrence of the afterimage, and may enhance a contrast ratio thereof when operated in a transmissive mode.
    Type: Application
    Filed: March 12, 2004
    Publication date: September 23, 2004
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jae-Hyun Kim, Sang-Woo Kim, Jae-Young Lee, Yong-Kyu Jang, Sung-Eun Cha
  • Publication number: 20040119905
    Abstract: A liquid crystal display, in accordance with the present invention, includes a first substrate having a thin film transistor and a first electrode formed thereon. The first electrode is electrically connected to the thin film transistor. A first insulating layer is formed on the first substrate including the thin film transistor and the first electrode and a window is formed in the first insulating layer, the window exposing a predetermined region of the first electrode. A second electrode is provided on the first insulating layer and electrically connected to the first electrode. A second substrate includes a third electrode formed thereon. A first gap is formed between a surface of the third electrode and a surface of the predetermined region of the first electrode, and a second gap is formed between the surface of the third electrode and a surface of the second electrode. A liquid crystal layer is interposed between the first gap and the second gap.
    Type: Application
    Filed: December 3, 2003
    Publication date: June 24, 2004
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Yong-Kyu Jang, Jae-Hyun Kim, Sang-Woo Kim, Jae-Young Lee, Sung-Eun Cha, Young-Nam Yun