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).

  • Publication number: 20050088579
    Abstract: The present invention builds a metal electrode that is controlled by the common electrode in each pixel cell. During operation, a voltage is first applied to this metal electrode to transform the liquid crystal molecule over this metal electrode from the splay state into the bend state. Next, a voltage is applied to the pixel electrode to transform the liquid crystal molecule in the whole pixel region from the splay state into the bend state. Two different voltage field also can be respectively applied to the common electrode and the pixel electrode.
    Type: Application
    Filed: September 9, 2004
    Publication date: April 28, 2005
    Applicant: HANNSTAR DISPLAY CORPORATION
    Inventors: Zhao-Hui Wu, Kei-Hsiung Yang, Po-Sheng Shih
  • Publication number: 20050082492
    Abstract: An X-ray image detector with a tandem-gate TFT. A storage capacitor comprises a bottom conductive layer connected to a ground line, and a top conductive layer insulated from the bottom conductive layer by an insulating layer. A thin film transistor controls release of the electric charge stored in the storage capacitor, wherein the thin film transistor comprises two electrically connected in series channel regions.
    Type: Application
    Filed: October 14, 2004
    Publication date: April 21, 2005
    Inventors: Wei-Chuan Lin, Kei-Hsiung Yang
  • Publication number: 20050062920
    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: Application
    Filed: November 5, 2004
    Publication date: March 24, 2005
    Applicant: International Business Machines Corporation
    Inventors: Praveen Chaudhari, James Doyle, Eileen Galligan, James Lacey, Shui-Chih Lien, Minhua Lu, Hiroki Nakano, Kei-Hsiung Yang
  • Publication number: 20050001958
    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: Application
    Filed: July 23, 2004
    Publication date: January 6, 2005
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kenneth Ho, Minhua Lu, Alan Rosenbluth, Kei-Hsiung Yang
  • Patent number: 6803981
    Abstract: A liquid crystal display includes a first substrate comprising a first electrode; a second substrate having a switching element disposing thereon a second electrode having a plurality of sub-electrodes and 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, connected to a gate electrode or an independent electrode, and having at least one notch disposed on an edge thereof and a longitudinal direction perpendicular to the longitudinal direction of the elongate hole; a liquid crystal layer having a plurality of liquid crystal molecules and interposed between the first substrate and the second substrate.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: October 12, 2004
    Assignee: Hannstar Display Corporation
    Inventors: Seok-Lyul Lee, Kei-Hsiung Yang
  • Patent number: 6798475
    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: March 2, 1999
    Date of Patent: September 28, 2004
    Assignee: International Business Machines Corporation
    Inventors: Kenneth C. Ho, Minhua Lu, Alan E. Rosenbluth, Kei-Hsiung Yang
  • Publication number: 20040183983
    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: Application
    Filed: March 30, 2004
    Publication date: September 23, 2004
    Applicant: Hannstar Display Corporation
    Inventors: Po-Sheng Shih, Seok-Lyul Lee, Kei-Hsiung Yang, Kuo-Tzune Chen, Wei-Hsin Wang, Sheng-Hsien Lin
  • Publication number: 20040174468
    Abstract: The present invention builds a metal electrode that is controlled by the common electrode in each pixel cell. During operation, a voltage is first applied to this metal electrode to transform the liquid crystal molecule over this metal electrode from the splay state to the bend state. Next, a voltage is applied to the pixel electrode to transform the liquid crystal molecule in the whole pixel region from the splay state to the bend state.
    Type: Application
    Filed: September 25, 2003
    Publication date: September 9, 2004
    Inventors: Kei-Hsiung Yang, Po-Sheng Shih
  • Publication number: 20040169811
    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: Application
    Filed: September 25, 2003
    Publication date: September 2, 2004
    Inventors: Kei-Hsiung Yang, Chien-Huang Liao, Hao-Ming Chang, Yen-Ting Chen
  • Publication number: 20040086662
    Abstract: A method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions, and reactive gas is introduced to the ion beam to saturate dangling bonds on the surface. Another method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions and quenched with a reactive component to saturate dangling bonds on the surface.
    Type: Application
    Filed: June 26, 2003
    Publication date: May 6, 2004
    Applicant: International Business Machines Corporation
    Inventors: Alessandro C. Callegari, Praveen Chaudhari, Fuad E. Doany, James P. Doyle, Eileen A. Galligan, James H. Glownia, Gareth G. Hougham, James A. Lacey, Shui-Chih Lien, Minhua Lu, Alan E. Rosenbluth, Kei-Hsiung Yang
  • Publication number: 20040080926
    Abstract: A polarized light source device comprises a light source, a reflector, a transparent substrate, an antireflection layer, and a plurality of metal grid wires. The reflector surrounds the light source for reflecting the light, and has an opening for emitting the light. The transparent substrate is disposed at the opening. The antireflection layer is disposed on the transparent substrate. The metal grid wires are disposed on the antireflection layer for transmitting the light with a predetermined polarization therethrough.
    Type: Application
    Filed: May 29, 2003
    Publication date: April 29, 2004
    Applicant: HannStar Display Corp.
    Inventors: Wei Chou Chen, Kei Hsiung Yang
  • Publication number: 20040017675
    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: Application
    Filed: August 27, 2002
    Publication date: January 29, 2004
    Applicant: HANNSTAR DISPLAY CORP.
    Inventor: Kei Hsiung Yang
  • Publication number: 20030234901
    Abstract: A liquid crystal display has a pair of transparent substrates disposed opposite to each other sandwiching a liquid crystal layer therebetween, and the liquid crystal layer comprises a plurality of liquid crystal molecules and chiral components. A plurality of scanning electrodes and signal electrodes are patterned on the first substrate to define a plurality of pixel areas, wherein each pixel area has a first area and a second area. A plurality of switching devices are formed on the plurality of pixel areas and connected to the scanning electrodes, the signal electrodes and the pixel electrodes. A protrusive structure with a plurality of protrusions formed in each pixel area to generate a pretilt angle for liquid crystal molecules.
    Type: Application
    Filed: August 29, 2002
    Publication date: December 25, 2003
    Applicant: HannStar Display Corp.
    Inventors: Seok Lyul Lee, Ming-Tien Lin, Kei-Hsiung Yang, Ching-Chao Chang
  • Patent number: 6665033
    Abstract: A method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions, and reactive gas is introduced to the ion beam to saturate dangling bonds on the surface. Another method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions and quenched with a reactive component to saturate dangling bonds on the surface.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: December 16, 2003
    Assignee: International Business Machines Corporation
    Inventors: Alessandro C. Callegari, Praveen Chaudhari, Fuad E. Doany, James P. Doyle, Eileen A. Galligan, James H. Glownia, Gareth G. Hougham, James A. Lacey, Shui-Chih Lien, Minhua Lu, Alan E. Rosenbluth, Kei-Hsiung Yang
  • Patent number: 6650383
    Abstract: A reflective liquid crystal lightvalve for modulating the polarization of incident light within a specified band of wavelengths into on and off states, comprises: (i) a pixelated reflective backplane; (ii) a first liquid crystal layer, positioned proximate the pixelated reflective backplane, the first liquid crystal layer being tuned in the off state to switch incident light at the center of the specified band of wavelengths into a state that is not fully off; and (iii) a second liquid crystal layer, positioned proximate the first liquid crystal layer wherein the first liquid crystal layer is positioned between the second liquid crystal layer and the pixelated reflective backplane, the second liquid crystal layer having a birefringence which, at a given depth within its thickness, is substantially equal and opposite to a birefringence of a layer within the first liquid crystal layer that is located at a matching distance from a midplane separating the first and second liquid crystal layers.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: November 18, 2003
    Assignee: International Business Machines Corporation
    Inventors: Minhua Lu, Alan Edward Rosenbluth, Kei-Hsiung Yang
  • Publication number: 20030142257
    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: Application
    Filed: January 28, 2002
    Publication date: July 31, 2003
    Applicant: 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: 6426786
    Abstract: A single-domain, two-domain or four-domain homeotropic- or tilted homeotropic-alignment liquid crystal display device of either the transmissive-type or reflective-type having a high contrast ratio, a good display quality, and a high photo-stability (and a method of producing the same), includes a homeotropic- or tilted homeotropic-alignment layer which includes an oxide layer prepared by a single oblique evaporation of an activated oxide source. The angle between the evaporation direction and the substrate plane forms an angle from about ±20° to about ±90°, and the thickness of the oxide layer is from about 10 nm to about 200 nm. A method of homeotropic-alignment or tilted homeotropic-alignment of liquid crystals by a single oblique evaporation process is also provided.
    Type: Grant
    Filed: June 1, 1999
    Date of Patent: July 30, 2002
    Assignee: International Business Machines Corporation
    Inventors: Minhua Lu, Kei-Hsiung Yang
  • Publication number: 20020085133
    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: Application
    Filed: March 2, 1999
    Publication date: July 4, 2002
    Inventors: KENNETH C. HO, MINHUA LU, ALLAN E. ROSENBLUTH, KEI-HSIUNG YANG
  • Publication number: 20020063830
    Abstract: A method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions, and reactive gas is introduced to the ion beam to saturate dangling bonds on the surface. Another method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions and quenched with a reactive component to saturate dangling bonds on the surface.
    Type: Application
    Filed: November 30, 2000
    Publication date: May 30, 2002
    Inventors: Alessandro C. Callegari, Praveen Chaudhari, Fuad E. Doany, James P. Doyle, Eileen A. Galligan, James H. Glownia, Gareth G. Hougham, James A. Lacey, Shui-Chih Lien, Minhua Lu, Alan E. Rosenbluth, Kei-Hsiung Yang
  • Patent number: 6333728
    Abstract: An apparatus provides optimal on-off contrast ratio in a liquid crystal display panel. The apparatus includes a capacitive temperature sensing device for sensing the temperature of liquid crystal display pixels and having an output voltage according to an applied input voltage and a sensed temperature; a monitoring device including differentiator and sample and hold circuit for obtaining a peak voltage corresponding to a maximum change of the voltage output from the temperature sensing device; and a device for measuring a difference between the peak voltage with a predetermined reference voltage and outputting a signal representing the difference. Heat is consequently applied to the liquid crystal display panel in accordance with a measured temperature difference. Advantageously, the capacitive temperature sensing device is formed as part of the liquid crystal display element.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: December 25, 2001
    Assignee: International Business Machines Corporation
    Inventors: Frank R. Libsch, Kei-Hsiung Yang