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: 7019799
    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, and a band-pass filter. The first polarizer plate is arranged between the liquid crystal and the light source, and the second polarizer plate is arranged between the liquid crystal and the viewer. The band-pass filter absorbs a component of the light, in which a wave-length of the component of the light is no more than 440 nm, and the band-pass filter is arranged between the light source and the viewer.
    Type: Grant
    Filed: January 25, 2005
    Date of Patent: March 28, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Yuka Utsumi, Ikuo Hiyama, Shinichi Komura, Katsumi Kondo
  • Patent number: 7006113
    Abstract: A display apparatus includes pixels arranged in matrix; a pixel electrode disposed inside each of the pixels; a display device disposed inside each of the pixels, for executing display in accordance with a voltage of the pixel electrode; a scanning line driving circuit; an identification signal line driving circuit; a storage unit for storing the identification signal supplied from the identification signal line in the pixel; a gray scale voltage line driving circuit; a selection unit for selecting the gray scale voltage supplied to the gray scale voltage lines based on the identification signal stored in the storage unit; a switching device for applying the selected gray scale voltage to the pixel electrode; and a gray scale write line driving circuit for supplying a gray scale write signal to a gray scale write line for controlling the switching device.
    Type: Grant
    Filed: August 22, 2001
    Date of Patent: February 28, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Tsunenori Yamamoto, Tatsuki Inuzuka, Ikuo Hiyama, Shinichi Komura
  • Patent number: 7006173
    Abstract: In order to realize liquid crystal display devices having a wide viewing angle and reduce the absorption loss by polarizers and color filters, and arrangement of reflective color selective means, reflective polarizing selective means, a light control element, and others are specified.
    Type: Grant
    Filed: March 17, 1999
    Date of Patent: February 28, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Ikuo Hiyama, Makoto Tsumura, Masaya Adachi, Katsumi Kondo, Jun-ichi Hirakata, Yuji Mori
  • Patent number: 6992676
    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 12, 2004
    Date of Patent: January 31, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuki Inuzuka, Tsunenori Yamamoto, Ikuo Hiyama, Makoto Tsumura, Yasutaka Toyoda
  • Publication number: 20060017860
    Abstract: A liquid crystal display apparatus including: a liquid crystal display element having a liquid crystal layer between a couple of substrates; a backlight apparatus arranged at one side of the couple of substrates of the liquid crystal display element; a polarizer arranged between the liquid crystal display element and the backlight apparatus; a luminous intensity distribution control element arranged at the other side of the couple of substrates of the liquid crystal display element; an analyzer arranged between the liquid crystal display element and the luminous intensity distribution control element, wherein the luminous intensity distribution control element comprises a transparent base member, a plural lenses arranged on the transparent base member, and a light absorbing layer having small opening portions substantially at focal positions of an individual lens of the plural lenses, and the transparent base member is constituted of a transparent body substantially optically isotropic or a transparent body h
    Type: Application
    Filed: September 12, 2005
    Publication date: January 26, 2006
    Inventors: Masaya Adachi, Makoto Tsumura, Ikuo Hiyama, Tetsuro Minemura
  • Publication number: 20050276069
    Abstract: A liquid crystal display apparatus having a diffusion plate and/or a prism sheet disposed between a liquid crystal display device and a plurality of light emission portions. Each light emission portion is constituted by an optical guide and one or more light emitting devices. The optical guide has a light reflection surface formed in a substrate and a light transmission surface brought into tight contact with the light reflection surface. The light emitting devices are integrated with the optical guide. Then, the light reflection surface is a scatter reflection surface, and an average angle between the light reflection surface and the light transmission surface is set to range from 7° to 23°. Thus, obtained is a thin-type liquid crystal display apparatus high in luminance of light outgoing to the front surface of the display apparatus and superior in uniformity of outgoing angle distribution or luminance distribution.
    Type: Application
    Filed: May 11, 2005
    Publication date: December 15, 2005
    Inventors: Hitoshi Taniguchi, Tsunenori Yamamoto, Ikuo Hiyama
  • Publication number: 20050265051
    Abstract: There is provided a lighting unit whose area is implemented into a large area by assembling a plurality of lighting modules in a flat-surface-like manner. Moreover, a plurality of electrical connectors are positioned in each lighting module in such a manner that the electrical connectors face each side of each lighting module. Here, the plurality of electrical connectors are mutually connected to the plurality of lighting modules adjacent thereto.
    Type: Application
    Filed: May 25, 2005
    Publication date: December 1, 2005
    Inventors: Tsunenori Yamamoto, Ikuo Hiyama, Akitoyo Konno, Daisuke Kajita
  • Publication number: 20050253798
    Abstract: To provide a display device capable of displaying a moving picture with high definition and at high speed. An image display system includes: an image display unit; and a control unit. The control unit has: a block discrimination circuit portion; an image processing portion; a storage portion; and a synchronizing signal generation portion. The block discrimination circuit portion discriminates a moving picture or a still picture to process the image information in accordance with the discriminated result, in which the number of gradations for the image information processed when the discriminated result is the moving picture is lower than when the discriminated result is the still picture. Thereby, the high definition image display and the high speed moving picture display can be effected by reducing the information with lower degree of recognition.
    Type: Application
    Filed: July 25, 2005
    Publication date: November 17, 2005
    Inventors: Ikuo Hiyama, Tsunenori Yamamoto, Akitoyo Konno, Makoto Tsumura, Yoshiyuki Kaneko, Yoshiro Mikami, Tatsuki Inuzuka, Yasutaka Toyoda
  • Publication number: 20050231106
    Abstract: Conventional light-emitting elements, in particular an organic electroluminescence devices, involve problems resulting from a low light extraction efficiency of 20% or less, because of limitations on light emission set by total reflection angle on an organic layer or transparent electrode as the component, and are demanded to have improved luminance and other optical characteristics which depend on viewing angle. The present invention provides an organic electroluminescence device which can improve a light extraction efficiency and thereby reduce operational current and power consumption by incorporating a laminate of optical thin films of low refractive index and having pores whose size is controlled at a level equivalent to or shorter than visible wavelengths, because the light components totally reflected to become wave-guided or reflected light in a common device can be extracted as light scattered by the pores.
    Type: Application
    Filed: April 4, 2005
    Publication date: October 20, 2005
    Inventors: Toshiaki Tanaka, Hiroshi Sasaki, Hajime Murakami, Masao Shimizu, Ikuo Hiyama
  • Publication number: 20050231457
    Abstract: The liquid crystal display apparatus includes a liquid crystal display, a backlight unit for emitting rays of light of three or more colors, the ray of each color being controlled, and applying these rays of light onto the liquid crystal display. A controller is further provided for controlling a change of display data of each color of the liquid crystal display and an emitted light quantity of each color of the backlight unit at a time, based on a video signal being inputted for displaying the corresponding image and an output signal sent from an ambient light sensor for sensing ambient light.
    Type: Application
    Filed: February 9, 2005
    Publication date: October 20, 2005
    Inventors: Tsunenori Yamamoto, Daisuke Kajita, Ikuo Hiyama, Akitoyo Konno, Tatsuki Inuzuka, Masatoshi Wakagi
  • Publication number: 20050206817
    Abstract: A liquid crystal display apparatus includes a first polarizer located on one side of a first substrate, a second polarizer located on the opposite side of a second substrate, a liquid crystal layer formed of liquid crystal molecules and between the first and the second substrates so that the liquid crystal molecules may be aligned in parallel to the first or the second substrate and to which an electric field is applied in parallel to the first substrate, and a lighting device. The first or the second polarizer includes a polarization layer and supporting materials located on both sides of the polarization layer, reducing light leakage and a colour shift in a black display state when viewed from the oblique direction.
    Type: Application
    Filed: January 21, 2005
    Publication date: September 22, 2005
    Inventors: Daisuke Kajita, Ikuo Hiyama, Mutsumi Maehara, Yuka Utsumi
  • Patent number: 6943947
    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. In the light distribution control element (100) constituted of a transparent base member (104), an array of a plurality of micro-lenses (transparent beads 105) densely arranged 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 anisotropy.
    Type: Grant
    Filed: September 24, 2003
    Date of Patent: September 13, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Masaya Adachi, Makoto Tsumura, Ikuo Hiyama, Tetsuro Minemura
  • Publication number: 20050195486
    Abstract: A conventional thin membrane of aerogel, although achieving a low refractive index, retains some difficulty when it is to be applied to display apparatuses or the like, because of its low strength. Membranes produced by other methods are difficult to simultaneously achieve low refractive index and sufficient strength. The present invention provides an anti-reflecting membrane which is formed at least on one side of a plate transmitting visible light, is composed of fine inorganic oxide particles and a binder, contains a number of pores inside, and has an arithmetic average surface roughness (Ra) below 6 nm. The present invention also provides preferred embodiments of the display apparatuses provided with the membrane.
    Type: Application
    Filed: January 21, 2005
    Publication date: September 8, 2005
    Inventors: Hiroshi Sasaki, Yasushi Tomioka, Masaya Adachi, Makiko Sugibayashi, Ikuo Hiyama, Katsumi Kondou
  • Patent number: 6940481
    Abstract: A liquid crystal display apparatus which is adapted to divide one frame period into a preset writing period, a first writing period, a first holding period, a second writing period, and a second holding period, to be driven in this sequence. The first and second writing periods have reverse writing voltage polarities and the second writing period is set to be about ½ of the first writing period.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: September 6, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Akitoyo Konno, Makoto Tsumura, Tsunenori Yamamoto, Ikuo Hiyama, Yoshinori Aono
  • Publication number: 20050184952
    Abstract: The video display apparatus has a light modulation device for forming a picture in accordance with a video signal and a lighting unit for irradiating, on the light modulation device, illumination light necessary to cause it to display the picture. In the apparatus, the lighting unit irradiates the illumination light in sequence of individual plural illumination light source partitive areas, a luminance distribution calculating unit calculates luminance distributions of video signals corresponding to the plural partitive areas to determine illumination light luminance levels of the individual partitive areas, an illumination controller controls rays of the illumination light of individual areas of the lighting unit on the basis of determination by the luminance distribution calculating unit, and a video corrector corrects the video signal inputted to the light modulation device on the basis of the determination by the luminance distribution calculating unit.
    Type: Application
    Filed: February 9, 2005
    Publication date: August 25, 2005
    Inventors: Akitoyo Konno, Masaya Adachi, Daisuke Kajita, Tsunenori Yamamoto, Katsumi Kondo, Tatsuki Inuzuka, Ikuo Hiyama, Yuka Utsumi
  • Publication number: 20050180124
    Abstract: A light unit which includes a plurality of light-emitting diode (LED) light sources arranged in parallel, a light-guiding member arranged on said LED light sources, a light reflecting part for reflecting light from said LED light sources forward, a light diffusion part for outgoing light from the surface of said light-guiding member to outside, and an optical path changing part arranged above said light-diffusion part, wherein a side of said light-guiding member that faces said light diffusion part is flat.
    Type: Application
    Filed: April 19, 2005
    Publication date: August 18, 2005
    Inventors: Masaya Adachi, Ikuo Hiyama, Makoto Tsumura, Shusuke Endo
  • Publication number: 20050162584
    Abstract: A liquid crystal display device of the present invention is configured of a liquid crystal display unit for displaying an image, a backlight unit controllable for each color that radiates light at the liquid crystal display unit, a display controller for controlling a display of the liquid crystal display unit, and an emission control circuit for controlling an emission of the each color of the backlight unit, wherein the emission control circuit performs control so that emission start timing and emission end timing in a sequential emission period of the each color of the backlight unit match in all colors.
    Type: Application
    Filed: November 9, 2004
    Publication date: July 28, 2005
    Inventors: Tsunenori Yamamoto, Daisuke Kajita, Ikuo Hiyama
  • Publication number: 20050140855
    Abstract: A normally-closed liquid crystal display includes a component to selectively absorb characteristic leakage light occurring at black representation. Therefore, when black is displayed, occurrence of unnecessary leakage light due to partial depolarization of polarized light caused by a component of an LCD panel can be suppressed. It is therefore possible to provide a liquid crystal display in which display performance of black is improved to clearly display black.
    Type: Application
    Filed: December 23, 2004
    Publication date: June 30, 2005
    Inventors: Yuka Utsumi, Makiko Sugibayashi, Ikuo Hiyama, Katsumi Kondo, Mutsumi Maehara
  • Patent number: 6909442
    Abstract: A display device including a plurality of blocks of pixels each of which includes a red subpixel, a green subpixel, and a blue subpixel, each of the blocks including pixels in a form of a matrix having N rows and M columns includes a first active element shared among three subpixels of each pixel and a second active element connected to a second active element formed in each subpixel connected to the first active element. Ma gradation voltage lines (Ma is an integer; M?Ma?2) respectively of red, green, and blue subpixels in a direction of the column are commonly connected. The display device directly displays a compressed image signal without developing the image signal into a bit map in which each subpixel has gradation information.
    Type: Grant
    Filed: August 21, 2002
    Date of Patent: June 21, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Ikuo Hiyama, Tsunenori Yamamoto, Akitoyo Konno, Makoto Tsumura
  • Publication number: 20050128378
    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, and a band-pass filter. The first polarizer plate is arranged between the liquid crystal and the light source, and the second polarizer plate is arranged between the liquid crystal and the viewer. The band-pass filter absorbs a component of the light, in which a wave-length of the component of the light is no more than 440 nm, and the band-pass filter is arranged between the light source and the viewer.
    Type: Application
    Filed: January 25, 2005
    Publication date: June 16, 2005
    Inventors: Yuka Utsumi, Ikuo Hiyama, Shinichi Komura, Katsumi Kondo