Patents by Inventor Ikuo Hiyama

Ikuo Hiyama 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: 6894671
    Abstract: A display apparatus is capable of adapting sufficiently to an increase in the display frequency even when using an optical modulation element which has a fairly low response speed and can rewrite an image at a high speed. The display apparatus separately performs mapping of display data for an optical modulation element of each pixel and application of gradation information. The display apparatus divides a display period of one frame into a plurality of sub-frames, controls the input value for the optical modulation element independently per each sub-frame in the plurality of sub-frames, and displays an image with a gradation display using the optical modulation element.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: May 17, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Tsunenori Yamamoto, Ikuo Hiyama, Shinichi Komura, Tetsuya Aoyama, Hajime Akimoto, Katsuyuki Funahata, Kazuhiro Kuwabara
  • Publication number: 20050093813
    Abstract: An illumination device and display device using it display motion pictures without a blur and make a light utilizing efficiency of a backlight improved. An illumination device having a light pipe of a substantially parallel flat-form sheet, whose one surface is an outgoing light surface and a light source unit is placed at one side and both side edges, is equipped with a light axis of lights after having entered the light pipe from the light source unit being unparallel to the outgoing light surface of the light pipe, and a reflection body unit consisting of plural unit reflection bodies divided into m in a vertical direction of the light source unit at an opposite side surface of the outgoing light surface of the light pipe, wherein the reflection body unit can contact ad separate from the opposite side surface the outgoing light surface of the light pipe for every unit reflection bodies.
    Type: Application
    Filed: October 29, 2003
    Publication date: May 5, 2005
    Inventors: Tsunenori Yamamoto, Ikuo Hiyama, Akitoyo Konno, Osamu Ito
  • Patent number: 6883950
    Abstract: A lighting unit having a plurality of light-emitting diode (LED) light sources arranged in parallel, a plurality of light-guiding members arranged along a direction wherein the LED light sources are arranged, a light reflecting part arranged on one side face of the light-guiding members, a light diffusion part arranged on an other side face of the light-guiding members, a light semi-transmitting reflection part arranged between the LED light source and the light diffusion part, and an optical path changing part arranged above the light-guiding members. A side of the light-guiding members that faces the light diffusion part is flat.
    Type: Grant
    Filed: March 15, 2004
    Date of Patent: April 26, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Masaya Adachi, Ikuo Hiyama, Makoto Tsumura, Shusuke Endo
  • Patent number: 6882333
    Abstract: A display apparatus which can display a ultra-high definition picture and high-speed animation is provided. The input picture signal is connected by signal generation circuit which supplies a desired signal to X driver according to n-gradation approximation picture signal output from n-gradation approximation calculating circuit to convert into n-gradation approximation picture signal approximated to binary gradation in every block and n-gradation approximation calculating circuit, Y driver, common voltage generating circuit, signal supply circuit and X driver, and a plurality of pixel parts connected by X signal line and Y driver which extends in the Y direction, and provided to the intersection parts of Y signal line which expands in the X direction.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: April 19, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Shinichi Komura, Tetsuya Aoyama, Ikuo Hiyama, Tsunenori Yamamoto, Hiroshi Kageyama, Shinya Ohtsuji
  • Publication number: 20050068480
    Abstract: In an in-plane switching (ISP) mode controlling transmission and shielding of light by application of lateral electric field to liquid crystal molecules aligned in the direction in parallel to a substrate, increase in luminance or color shift at a black-representation area or upon black-representation condition at an inclined viewing angle is reduced. First and second polarizing plates sandwiching a liquid crystal layer each have a supporting member (plate) on at least either surface thereof. The supporting member on the inside surface of the first polarizing plate on the side of an illumination unit has a retardation in the thickness direction R1·h1 and the supporting member on the inside surface of the second polarizing plate has a retardation in the thickness direction R2·h2. In the O-mode, R1·h1>R2·h2 and in the E-mode, R1·h1<R2·h2.
    Type: Application
    Filed: September 30, 2004
    Publication date: March 31, 2005
    Inventors: Ikuo Hiyama, Shinichi Komura, Tsunenori Yamamoto, Yuka Utsumi, Mutsumi Maehara, Daisuke Kajita
  • Patent number: 6850293
    Abstract: A liquid crystal display for displaying an image to be visible for a viewer, has a liquid crystal, a pair of electrodes for controlling an orientation of at least a part of the liquid crystal in accordance with an electric field between the electrodes, a light source for generating a light to be transmitted through the liquid crystal to the viewer, a pair of first and second polarizer plates, the first polarizer plate being arranged between the liquid crystal and the light source, and the second polarizer plate being arranged between the liquid crystal and the viewer, and a band-pass filter for absorbing a component of the light, a wave-length of which component is not more than 440 nm, and the band-pass filter being arranged between the light source and the viewer.
    Type: Grant
    Filed: October 27, 2003
    Date of Patent: February 1, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Yuka Utsumi, Ikuo Hiyama, Shinichi Komura, Katsumi Kondo
  • Patent number: 6850219
    Abstract: A display device is constituted by a display module which determines a plurality of pieces of pixels as belonging to one block unit, selects the plurality of pixels in each block unit at the same time and displays a picture image by adding one or a plurality of specific patterns each having different spatial frequencies of each block unit; a display control unit which controls the display module; a picture image signal generation unit which generates picture image signals; and a computing circuit which generates the specific patterns each having different spatial frequencies while weighting the same based on the picture image signals for every block unit. Thereby, a display device which reduces the signal clock frequency as well as increases the signal writing time, enhances the opening rate of an LC panel and permits a highly fine display and a high speed motion picture display, is obtained.
    Type: Grant
    Filed: May 25, 2001
    Date of Patent: February 1, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Tetsuya Aoyama, Shinichi Komura, Ikuo Hiyama, Tsunenori Yamamoto, Yoshiyuki Kaneko, Mitsuji Ikeda, Osamu Itou, Hideo Satou, Shoichi Hirota
  • Publication number: 20050012754
    Abstract: A control device, which is capable of suppressing an increase in a load of a data transfer for an increase of an amount of data is provided. The control-device includes a compressed data generation unit for generating a compressed data based on a set-up value inputted, and a controller for outputting a frame rate-information to the compressed data generation unit, and for making compressed data to be outputted from a memory for use in storing a compressed data to an image display device in accordance with the frame rate.
    Type: Application
    Filed: August 12, 2004
    Publication date: January 20, 2005
    Inventors: Tatsuki Inuzuka, Tsunenori Yamamoto, Ikuo Hiyama, Makoto Tsumura, Yasutaka Toyoda
  • Patent number: 6844968
    Abstract: It is possible to eliminate a fringe pattern produced at the time of incidence of polarized light of a light distribution control element, in which stray light derived from outside unnecessary light in a liquid crystal display apparatus of the like can be effectively reduced, and bright, wide viewing angle characteristics can be achieved when the display is viewed at any angle by an observer. In a light distribution control element constituted of a transparent base member, an array of a plurality of micro-lenses (transparent beads densely arrange on the transparent base member and a light absorbing layer having very small opening portions substantially at focal positions of the micro-lenses, the transparent base member is constituted of a transparent body which is substantially isotropic optically or a transparent body having uniaxial optical anisotrophy.
    Type: Grant
    Filed: August 18, 2003
    Date of Patent: January 18, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Masaya Adachi, Makoto Tsumura, Ikuo Hiyama, Tetsuro Minemura
  • Publication number: 20040174717
    Abstract: A lighting unit having a plurality of light-emitting diode (LED) light sources arranged in parallel, a plurality of light-guiding members arranged along a direction wherein the LED light sources are arranged, a light reflecting part arranged on one side face of the light-guiding members, a light diffusion part arranged on an other side face of the light-guiding members, a light semi-transmitting reflection part arranged between the LED light source and the light diffusion part, and an optical path changing part arranged above the light-guiding members. A side of the light-guiding members that faces the light diffusion part is flat.
    Type: Application
    Filed: March 15, 2004
    Publication date: September 9, 2004
    Inventors: Masaya Adachi, Ikuo Hiyama, Makoto Tsumura, Shusuke Endo
  • Patent number: 6784891
    Abstract: A control device, which is capable of suppressing an increase in a load of a data transfer for an increase of an amount of data is provided. The control device includes a compressed data generation unit for generating a compressed data based on a set-up value inputted, and a controller for outputting a frame rate information to the compressed data generation unit, and for making compressed data to be outputted from a memory for use in storing a compressed data to an image display device in accordance with the frame rate.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: August 31, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuki Inuzuka, Tsunenori Yamamoto, Ikuo Hiyama, Makoto Tsumura, Yasutaka Toyoda
  • Publication number: 20040140972
    Abstract: A display unit has a brightness equal to that in a conventional black-and-white reflection type and the power consumption is small at a standby time, and bright color display of high quality can be produced and power consumption is small at the time of use. An information device having this display unit, such as a portable phone, also is provided. The display unit has a color light emitting means, a reflecting mean of external light and a light polarizing state modulating means. The display unit has a driving method switching means for switching color light emitting display and reflection display by on/off control of the light emitting means and switching control of a driving method of a display element.
    Type: Application
    Filed: January 8, 2004
    Publication date: July 22, 2004
    Inventors: Shouichi Hirota, Makoto Tsumura, Ikuo Hiyama, Takayuki Oouchi
  • Patent number: 6756954
    Abstract: A liquid crystal display apparatus for high quality moving image is provided.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: June 29, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Tsunenori Yamamoto, Nobuyuki Suzuki, Makoto Tsumura, Ikuo Hiyama
  • Publication number: 20040085494
    Abstract: A liquid crystal display for displaying an image to be visible for a viewer, has a liquid crystal, a pair of electrodes for controlling an orientation of at least a part of the liquid crystal in accordance with an electric field between the electrodes, a light source for generating a light to be transmitted through the liquid crystal to the viewer, a pair of first and second polarizer plates, the first polarizer plate being arranged between the liquid crystal and the light source, and the second polarizer plate being arranged between the liquid crystal and the viewer, and a band-pass filter for absorbing a component of the light, a wave-length of which component is not more than 440 nm, and the band-pass filter being arranged between the light source and the viewer.
    Type: Application
    Filed: October 27, 2003
    Publication date: May 6, 2004
    Inventors: Yuka Utsumi, Ikuo Hiyama, Shinichi Komura, Katsumi Kondo
  • Publication number: 20040057110
    Abstract: There is eliminated a fringe pattern produced at the time of incidence of polarized light of a light distribution control element, in which stray light derived from outside unnecessary light in a liquid crystal display apparatus or the like can be effectively reduced, and bright, wide viewing angle characteristics are achieved as viewed at any angle by an observer.
    Type: Application
    Filed: September 24, 2003
    Publication date: March 25, 2004
    Inventors: Masaya Adachi, Makoto Tsumura, Ikuo Hiyama, Tetsuro Minemura
  • Patent number: 6709122
    Abstract: A lighting unit including a plurality of linear or bar-shaped light sources arranged in parallel, a light-guiding plate having a plurality of grooves to accommodate the light sources, a light diffuse reflector provided at either one side of the light-guiding plate, a first light diffuser provided at the side opposite to that which faces the light diffuse reflector of the light-guiding plate, and a light semi-transmitting reflector provided between each light source and the light diffuser. A second light diffuser is located with a clearance at the side opposite to that which faces the light-guiding plate of the first light diffuser.
    Type: Grant
    Filed: April 1, 2003
    Date of Patent: March 23, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Masaya Adachi, Ikuo Hiyama, Makoto Tsumura, Shusuke Endo
  • Publication number: 20040051945
    Abstract: It is possible to eliminate a fringe pattern produced at the time of incidence of polarized light of a light distribution control element, in which stray light derived from outside unnecessary light in a liquid crystal display apparatus of the like can be effectively reduced, and bright, wide viewing angle characteristics can be achieved when the display is viewed at any angle by an observer. In a light distribution control element constituted of a transparent base member, an array of a plurality of micro-lenses (transparent beads densely arrange on the transparent base member and a light absorbing layer having very small opening portions substantially at focal positions of the micro-lenses, the transparent base member is constituted of a transparent body which is substantially isotropic optically or a transparent body having uniaxial optical anisotrophy.
    Type: Application
    Filed: August 18, 2003
    Publication date: March 18, 2004
    Inventors: Masaya Adachi, Makoto Tsumura, Ikuo Hiyama, Tetsuro Minemura
  • Patent number: 6704066
    Abstract: A liquid crystal display apparatus which is so configured that first and second pixel electrodes and active elements are positioned in a pixel, and an output terminal thereof is connected to a pixel electrode and a row line or a common line respectively, driving is performed by a difference voltage between the row lines or between the row line and the common line, and besides, a superimposing portion via a dielectric film of the first pixel electrode and the second pixel electrode is provided around a center in a row direction of pixels, and moreover, a holding capacitance is formed in the superimposing portion, and the first pixel electrode and the second pixel electrode are in a shape forming an axisymmetric relation in the row direction centering on the superimposing portion.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: March 9, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Tsumura, Akitoyo Konno, Tsunenori Yamamoto, Ikuo Hiyama, Yoshinori Aono
  • Patent number: 6704067
    Abstract: A liquid crystal display apparatus having a pair of substrates of which at least one is transparent; and a liquid crystal layer supported between the pair of substrates, in which one of the pair of substrates has a plurality of row lines and a plurality of row lines, and pixels are placed corresponding to intersections of the plurality of row lines and the plurality of row lines. A first pixel electrode and a second pixel electrode are provided in the pixel, and a first active element is placed in the pixel and an output terminal thereof is connected to one row line adjacent to the first pixel electrode and the pixel, and a second active element is placed in the pixel and its output is connected to the other row line adjacent to the second pixel electrode.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: March 9, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Tsumura, Akitoyo Konno, Tsunenori Yamamoto, Ikuo Hiyama, Yoshinori Aono
  • Publication number: 20040041760
    Abstract: A liquid crystal display device includes a periodically switching light source repeatedly turning ON and OFF at a predetermined timing and a display unit for displaying an image by controlling light transmission or reflection of the periodically switching light source according to the image data. In each display frame constituting one image, write into the liquid crystal display device is divided into a first write for writing into all the pixels using precharge data as representative of a plurality of pixels created according to a first algorithm and a second write for additionally writing overwriting data created on at least some pixels according to a second algorithm, thereby displaying an image. In the liquid crystal display device using the periodically switching light source, the periodically switching ghost is suppressed and the moving picture display performance is improved.
    Type: Application
    Filed: July 7, 2003
    Publication date: March 4, 2004
    Inventors: Makoto Tsumura, Akitoyo Konno, Tsunenori Yamamoto, Ikuo Hiyama