Patents by Inventor Kei-Hsiung Yang

Kei-Hsiung Yang 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: 7057686
    Abstract: A liquid crystal (LC) lightvalve comprising a twisted nematic LC layer whose molecules are aligned with pixel edges at the mirror backplane, thereby providing improved contrast and efficiency, and reduced visibility of post spacers in black state. The present invention is directed to an LC structure wherein the backplane is rubbed in a direction rectilinear with pixel edges. The LC layer is given the same twist rotation and birefringence as in the conventional TN lightvalve. Polarization control is maintained by illuminating the lightvalve with light whose polarization is rotated by the twist angle relative to the x,y, pixel axes, and by collecting the orthogonally polarized component of the reflected light. The lightvalve top glass is thus rubbed in a direction which is rotated by the twist angle from the horizontal or vertical direction at which the backplane is rubbed.
    Type: Grant
    Filed: July 23, 2004
    Date of Patent: June 6, 2006
    Assignee: International Business Machines Corporation
    Inventors: Kenneth C. Ho, Minhua Lu, Alan E. Rosenbluth, Kei-Hsiung Yang
  • Patent number: 7045821
    Abstract: A pixel structure of a display and a driving method thereof are disclosed. The pixel structure disclosed in the invention includes a structure with less elements than that of prior art. The driving method thereof is also much easier than that of prior art. The pixel structure and driving method thereof can completely compensate the variations of the threshold voltage of a driving transistor thereof. The pixel structure includes a switching transistor, a driving transistor, a capacitor, a light emitting diode (LED) and a reset transistor.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: May 16, 2006
    Assignee: Hannstar Display Corporation
    Inventors: Po-Sheng Shih, Kei-Hsiung Yang
  • Patent number: 7046329
    Abstract: A method for manufacturing an optical compensated bend nematic liquid crystal display panel and a structure thereof are described. A surface of a first glass substrate having a plurality of first spacers disposed thereon, wherein a first alignment layer is formed on the surface of the first glass substrate, is provided first in this method. Then, a mixture consisting essentially of a plurality of liquid crystal molecules and a plurality of monomers with long side chains, of which carbon number is over 7, is coated on the surface of the first glass substrate. Thereafter, the mixture is cured by UV irradiation and the monomers are transferred into polymers to form an isolation layer on top of the mixture. After a second glass substrate having a plurality of second spacers disposed thereon and a second alignment layer formed thereon is provided, the first glass substrate and the second glass substrate are aligned and assembled.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: May 16, 2006
    Assignee: HannStar Display Corporation
    Inventors: Kei-Hsiung Yang, Chien-Huang Liao, Hao-Ming Chang, Yen-Ting Chen
  • Publication number: 20060071889
    Abstract: The present invention provides a touch-input-integrated liquid crystal display panel having a pattern unit with a coding arrangement. The pattern unit with the coding arrangement is integrated into the panel by one of the three ways of (1) disposing the pattern unit on the polarizer, (2) disposing the pattern unit on the upper substrate of the panel corresponding to the black matrix, and (3) disposing the pattern unit on the upper substrate of the panel not limited to be corresponding to the black matrix, wherein the pattern unit is made of a denser optical medium or a less dense optical medium, the depth of the pattern unit multiplied the refractive index of the medium is about (N+ΒΌ)-folds of the wavelength of the infrared ray, and furthermore the pattern unit can also be multiple-layer structure, a single-layer cholesteric liquid crystalline film or a multiple-layer structure wherein at least one layer is made of a cholesteric liquid crystalline film.
    Type: Application
    Filed: March 9, 2005
    Publication date: April 6, 2006
    Applicant: Hannstar Display Corporation
    Inventors: Kei-Hsiung Yang, Wei-Chou Chen
  • Publication number: 20060061698
    Abstract: A method for manufacturing a reflective coding plate is provided. The method includes steps of providing a first substrate, forming a mixture layer on the first substrate, providing a second substrate on the mixture layer and thereby a sandwich structure is formed, performing an orientation process on the sandwich structure, providing a mask having a code pattern thereon on one side of the sandwich structure, exposing the side of the sandwich structure to a UV light, removing the second substrate, and removing an unreacted part of the mixture layer.
    Type: Application
    Filed: January 27, 2005
    Publication date: March 23, 2006
    Applicant: Hannstar Display Corporation
    Inventors: Wei-Chou Chen, Kei-Hsiung Yang
  • Publication number: 20060061724
    Abstract: The present invention provides a reflective coding panel and a liquid crystal display. The liquid crystal display includes a panel, a reflective coding layer formed on the panel, and a polarizing plate positioned on the reflective coding layer, wherein the reflective coding layer includes a plurality of cholesteric liquid crystal flakes having a pitch length and an average reflective index, and the pitch length multiplied by the average reflective index is within a range of an infrared ray wavelength.
    Type: Application
    Filed: January 3, 2005
    Publication date: March 23, 2006
    Applicant: Hannstar Display Corporation
    Inventors: Wei-Chou Chen, Kei-Hsiung Yang
  • Publication number: 20060061720
    Abstract: Flexoelectric liquid crystal displays. A flexoelectric liquid crystal display has a first substrate, a second substrate parallel to the first substrate, a common electrode region, a pixel electrode region, and a liquid crystal layer disposed between the first and second substrates. The common electrode region is disposed on the first substrate and connected to the liquid crystal layer. The pixel electrode region is disposed on the second substrate and connected to the liquid crystal layer. Two electrical fields of equal magnitude in opposite directions are generated between the common and pixel electrode regions.
    Type: Application
    Filed: November 17, 2004
    Publication date: March 23, 2006
    Inventors: Wei-Chou Chen, Kei-Hsiung Yang
  • Patent number: 6995821
    Abstract: A structure (and method) for a reflective-type liquid crystal display includes a first-type electrode, a second-type electrode positioned opposite the first-type electrode and being of an opposite type than the first-type electrode and a liquid crystal material between the first-type electrode and the second-type electrode, wherein at least one of the first-type electrode and the second-type electrode includes an amorphous layer adjacent the liquid crystal material.
    Type: Grant
    Filed: April 23, 1999
    Date of Patent: February 7, 2006
    Assignee: International Business Machines Corporation
    Inventors: Minhua Lu, Robert L. Melcher, Kei-Hsiung Yang
  • Publication number: 20060007165
    Abstract: An input-sensor-integrated liquid crystal display panel has a first substrate, a second substrate, and a liquid crystal layer. The first substrate has at least one pixel controlling circuit, and the second substrate has a touch-detecting circuit. A color filter layer is formed between the first and second substrates, and the liquid crystal layer is filled in space formed by the first and second substrates.
    Type: Application
    Filed: September 1, 2004
    Publication date: January 12, 2006
    Inventors: Kei-Hsiung YANG, Wei-Chou CHEN
  • Publication number: 20050275792
    Abstract: A repairing method of a liquid crystal display panel having a gravity defect includes steps of removing the sealant outside the liquid crystal injection hole and providing a first pressure to the liquid crystal display panel. Next, a second pressure is continuously provided to the liquid crystal display panel, and the sealant in the liquid crystal injection hole is removed. Then, a third pressure is continuously provided to the liquid crystal display panel for pressing the liquid crystal out through the injection hole, and the flowed liquid crystal is cleaned out. After that, the liquid crystal injection hole is sealed with a fresh sealant and a fourth pressure is continuously provided to the liquid crystal display panel. Finally, the fresh sealant is cured and the fourth pressure is removed.
    Type: Application
    Filed: August 19, 2004
    Publication date: December 15, 2005
    Inventors: Chien-Ming CHEN, Kei-Hsiung YANG
  • Publication number: 20050275791
    Abstract: A fabricating method of a liquid crystal display panel provides a first substrate and a second substrate. The first substrate has a sealant used for sealing with the second substrate to form a liquid crystal cavity. The first substrate and the second substrate are placed into a chamber to perform a liquid crystal filling process. An end seal process is performed at a predetermined temperature higher than room temperature to seal the liquid crystal with a predetermined weight into the liquid crystal cavity. A liquid crystal injection method, an end seal process, and heating apparatus are also provided.
    Type: Application
    Filed: April 22, 2005
    Publication date: December 15, 2005
    Inventors: Chien-Ming CHEN, Kei-Hsiung YANG
  • Publication number: 20050270466
    Abstract: A liquid crystal display module manufactured by a chip-on-glass technology includes at least one glass substrate having a display area and a peripheral area. A plurality of scan and data lines is separately formed on the display area along horizontal and vertical directions. The liquid crystal display module also includes at least one gate driver chip and at least one source driver chip mounted on the peripheral area. The gate and source driver chips transmit signals to the scan and data lines via a plurality of output terminals, and thicknesses of the gate and source driver chips are less than 0.3 mm.
    Type: Application
    Filed: September 29, 2004
    Publication date: December 8, 2005
    Inventors: Pao-Yun Tang, Shu-Lin Ho, Kei-Hsiung Yang
  • Patent number: 6954247
    Abstract: Multi-domain liquid crystal cells having twist angles less than 90 degrees, and LCDs containing such liquid crystal cells, are provided. Such liquid crystal cells are stable, particularly at zero and high fields, and provide wide viewing angles. Also provided are methods of using an adjustable particle beam in combination with a mask to generate multi-domains alignments. Such methods are useful for producing liquid crystal cells in general, and for producing the novel multi-domain low twist angle liquid crystal cells of the present invention in particular.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: October 11, 2005
    Assignee: International Business Machines Corporation
    Inventors: Praveen Chaudhari, James P. Doyle, Eileen A. Galligan, James A. Lacey, Shui-Chih Lien, Minhua Lu, Hiroki Nakano, Kei-Hsiung Yang
  • Patent number: 6927828
    Abstract: A liquid crystal display includes a first substrate including a first electrode; a second substrate including thereon a second electrode having at least one elongate hole having a longitudinal direction and facing to the first electrode; a third electrode positioned under the at least one hole and between the second electrode and the second substrate; and a liquid crystal layer comprising a plurality of liquid crystal molecules and interposed between the first substrate and the second substrate. The third electrode has a bias voltage being two volts higher than a pixel voltage of the sub-electrode.
    Type: Grant
    Filed: March 30, 2004
    Date of Patent: August 9, 2005
    Assignee: Hannstar Display Corporation
    Inventors: Po-Sheng Shih, Seok-Lyul Lee, Kei-Hsiung Yang, Kuo-Tzune Chen, Wei-Hsin Wang, Sheng-Hsien Lin
  • Publication number: 20050146648
    Abstract: The present invention provides a Shield-Junction thin film transistor structure. According to the structure of the present invention, on top of the passivation layer, there is an island of protection electrode electrically insulated from the bottom ITO electrode. The protection electrode electrically connects with the gate line through a via hole and covers part of the drain electrode and its adjacent part of the TFT channel. Since the protection electrode does not cover or overlap with the source electrode, it has a negligible contribution to the data-line capacitance.
    Type: Application
    Filed: August 16, 2004
    Publication date: July 7, 2005
    Inventors: Kei-Hsiung Yang, Po-Sheng Shih
  • Publication number: 20050140611
    Abstract: The present invention provides a pixel driving circuit. A photo sensor is used in this driving circuit for sensing light from illumination devices to generate different induced currents. The different induced currents may form different driving currents to drive the illumination devices. Therefore, the illumination period of each illumination device is different but results in a same brightness after integration of each illumination device through a frame time.
    Type: Application
    Filed: July 6, 2004
    Publication date: June 30, 2005
    Inventors: Po-Sheng Shih, Kei-Hsiung Yang
  • Publication number: 20050105035
    Abstract: In accordance with the present invention, a mteal electrode or a common electrode line (both called as Vbias electrode) is built in the pixel region. Holes passing through the pixel electrode are formed in the positions corresponding to the mteal electrode or common electrode line (both called as Vbias electrode) so as to reduce the crosswise electrical field. The liquid crystal molecule in the whole pixel region is in a splay state.
    Type: Application
    Filed: December 27, 2004
    Publication date: May 19, 2005
    Inventors: Zhao-Hui Wu, Po-Sheng Shih, Kei-Hsiung Yang
  • Publication number: 20050105031
    Abstract: A pixel structure of a display and a driving method thereof are disclosed. The pixel structure disclosed in the invention includes a structure with less elements than that of prior art. The driving method thereof is also much easier than that of prior art. The pixel structure and driving method thereof can completely compensate the variations of the threshold voltage of a driving transistor thereof. The pixel structure includes a switching transistor, a driving transistor, a capacitor, a light emitting diode (LED) and a reset transistor.
    Type: Application
    Filed: March 29, 2004
    Publication date: May 19, 2005
    Inventors: PO-SHENG SHIH, KEI-HSIUNG YANG
  • Patent number: 6893136
    Abstract: A panel light source device comprises a light source, a U-shaped reflector surrounding the light source, a light guide, and a plurality of metal grid wires. The light guide has an incoming surface facing the light source and an outgoing surface. The light is transmitted into the light guide from the incoming surface and then transmitted out of the light guide from the outgoing surface. The metal grid wires are disposed between the incoming surface and the light source for transmitting the light with a predetermined polarization therethrough and reflecting the rest light therefrom.
    Type: Grant
    Filed: August 27, 2002
    Date of Patent: May 17, 2005
    Assignee: Hannstar Display Corp.
    Inventor: Kei Hsiung Yang
  • Publication number: 20050094072
    Abstract: A liquid crystal display (LCD) device comprises a first substrate having a grooved surface profile; an alignment film layer of inorganic material formed on the grooved surface and having the grooved surface profile, the alignment film of inorganic material being aligned in response to an ion beam incident to the grooved surface in a direction parallel to a groove direction; a second substrate aligned opposite the first substrate for forming a plurality of LCD cells having liquid crystal (LC) material deposited therein, wherein LC molecules align parallel to the grooves for enhanced LCD performance.
    Type: Application
    Filed: October 30, 2003
    Publication date: May 5, 2005
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Minhua Lu, Kei-Hsiung Yang