Patents by Inventor Katsumi Kondo

Katsumi Kondo 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: 7684005
    Abstract: A liquid crystal display apparatus includes a liquid crystal panel having polarizers, and a back light having a light source for illumination of the liquid crystal panel which has a characteristic of spectral transmittance required to satisfy the following equation, x>y>z, when a medium tone display voltage varies in a range between a minimum and maximum voltage for a Blue pixel, where “x” is a value of the transmittance in the panel at a wavelength corresponding to a longest wavelength in a range of wavelengths designated for blue light, “y” is a value of the transmittance in the panel at a wavelength corresponding to a maximum value of the intensity in a range of wavelengths designated for green light, and “z” is a value of the transmittance in the panel at a wavelength corresponding to a maximum value of the intensity in a range of wavelengths designated for red light.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: March 23, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Yuka Utsumi, Katsumi Kondo, Ikuo Hiyama, Osamu Itoh, Masahito Ohe, Kazuhiko Yanagawa, Keiichiro Ashizawa
  • Publication number: 20100066949
    Abstract: Provided is a liquid crystal display apparatus including: a liquid crystal panel including a pair of substrates; a liquid crystal layer sandwiched by the pair of substrates; plural electrodes formed on at least one of the pair of substrates; and a pair of polarizers provided in respective outsides of the pair of substrates; and a back light unit provided in a rear of the liquid crystal panel, in which one of the pair of polarizers, which is provided at a side of the back light unit, includes at least two types of layers which cause polarization, and in which the two types of layers include a first layer provided on a side of the liquid crystal layer and a second layer provided on a side of the back light unit, the first layer being a negative uniaxial polarizer layer, the second layer being a positive uniaxial polarizer layer.
    Type: Application
    Filed: August 12, 2009
    Publication date: March 18, 2010
    Inventors: Yuka UTSUMI, Ikuo Hiyama, Katsumi Kondo, Shigeru Matsuyama
  • Publication number: 20100060836
    Abstract: An image retention phenomenon and black unevenness generated after long-time operation in the liquid crystal device are prevented. By using a material having a polyamide acid ester as a precursor less likely to adsorb impurities on a boundary for an alignment film and a material having a dielectric constant anisotropy ?? of 5 or less for liquid crystals, adsorption of an antioxidant dispersed in the liquid crystals is suppressed to prevent oxidation of the liquid crystals. The extent that impurities are intruded into the liquid crystals is reduced by restricting the dielectric constant anisotropy ?? of the liquid crystals to 5 or less, thereby capable of preventing the image retention phenomenon and the black unevenness.
    Type: Application
    Filed: May 27, 2009
    Publication date: March 11, 2010
    Inventors: Noboru KUNIMATSU, Chikae MATSUI, Shigeru MATSUYAMA, Masaki MATSUMORI, Yasushi TOMIOKA, Katsumi KONDO
  • Patent number: 7615260
    Abstract: An active-matrix liquid crystal display device includes a pair of substrates, a liquid crystal layer disposed between the pair of substrates, a group of electrodes for applying to the liquid crystal layer an electric field substantially parallel to the substrate plane and a plural number of active elements being formed on one of the pair of substrates, and an alignment layer disposed between the liquid crystal layer and at least one of the pair of substrates. The alignment layer is made from polyamic acid obtained by reacting a diamine with an acid anhydride, and the acid anhydride is at least one member selected from the group consisting of 1,2,3,4-cyclopentanetetracarboxylic acid dianhydride, 1,2,3,4-butanetetracarboxylic acid dianhydride, and 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride.
    Type: Grant
    Filed: June 24, 2004
    Date of Patent: November 10, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Yoneya, Kishiro Iwasaki, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Yoshiharu Nagae
  • Publication number: 20090207361
    Abstract: An active matrix liquid crystal display device is provided, in which an after image remaining after removing an application of a direct current voltage is suppressed. The active matrix liquid crystal display device has a liquid crystal layer containing a liquid crystal molecule having negative dielectric anisotropy and a dopant having a dissociative group.
    Type: Application
    Filed: April 20, 2009
    Publication date: August 20, 2009
    Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
  • Patent number: 7567327
    Abstract: A liquid crystal display device of low power consumption which exhibits high image quality is realized. To each liquid-crystal-side pixel region of one substrate out of respective substrates which are arranged while sandwiching liquid crystal therebetween, a first switching element and a second switching element which are operated in response to a scanning signal from a gate signal line, a pixel electrode to which a video signal is supplied from the drain signal line through the first switching element, and a counter electrode to which a reference voltage signal is supplied from a reference voltage signal line through the second switching element, and the pixel electrode and the counter electrode are respectively formed of strip-like transparent conductive layers and are substantially alternately arranged in the inside of the pixel region.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: July 28, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Genshiro Kawachi, Hideo Sato, Toshio Miyazawa, Yoshiro Mikami, Katsumi Kondo
  • Patent number: 7551169
    Abstract: A liquid crystal display device can suppress the local temperature elevation of a liquid crystal in the vicinity of drivers. On a liquid-crystal-side surface of one substrate out of substrates which are arranged to face each other in an opposed manner while sandwiching a liquid crystal therebetween, a switching element which is operated in response to scanning signals from a gate signal line, a pixel electrode to which video signals from a drain signal line are supplied via the switching element, and a reference electrode which generates an electric field between the reference electrode and the pixel electrode are mounted on each pixel region of the liquid-crystal-side surface. The video signals from the drain signal line are generated by a driver chip mounted on one substrate. A light transmittivity of the liquid crystal layer is set to take a minimum value when a voltage is not applied between the pixel electrode and the reference electrode.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: June 23, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Setsuo Kobayashi, Katsumi Kondo, Nagatoshi Kurahashi
  • Publication number: 20090141220
    Abstract: A liquid crystal display includes a pair of substrates having a polarizer, a liquid crystal layer sandwiched between the substrates of the pair, a color filter layer sandwiched between one of the substrates of the pair and the liquid crystal layer, a light source for supplying light to the pair of substrates, the liquid crystal layer, and the color filter layer. The color filter layer includes three filters for displaying blue, green and red. The green filter of the three filters selectively includes an absorbing component capable of absorbing a light spectrum within a wavelength range from 400 nm to 500 nm.
    Type: Application
    Filed: February 2, 2009
    Publication date: June 4, 2009
    Inventors: Yuka Utsumi, Makiko Sugibayashi, Ikuo Hiyama, Katsumi Kondo, Mutsumi Maehara
  • Patent number: 7538829
    Abstract: An active matrix liquid crystal display device is provided, in which an after image remaining after removing an application of a direct current voltage is suppressed. The active matrix liquid crystal display device has a liquid crystal layer containing a liquid crystal molecule having negative dielectric anisotropy and a dopant having a dissociative group.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: May 26, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
  • Publication number: 20090086120
    Abstract: An object of the present invention is to propose the structure and constitution of a liquid crystal display device having a protection plate, which prevents exfoliation of black painting at ends of the protection plate when dust on the protection plate of the liquid crystal display device is wiped off, thus preventing degradation of design features.
    Type: Application
    Filed: August 15, 2008
    Publication date: April 2, 2009
    Inventors: Hiroshi Sasaki, Makiko Sugibayashi, Yasushi Tomioka, Katsumi Kondo
  • Publication number: 20090040438
    Abstract: A liquid crystal display apparatus includes a liquid crystal panel having polarizers, and a back light having a light source for illumination of the liquid crystal panel which has a characteristic of spectral transmittance required to satisfy the following equation, x>y>z, when a medium tone display voltage varies in a range between a minimum and maximum voltage for a Blue pixel, where “x” is a value of the transmittance in the panel at a wavelength corresponding to a longest wavelength in a range of wavelengths designated for blue light, “y” is a value of the transmittance in the panel at a wavelength corresponding to a maximum value of the intensity in a range of wavelengths designated for green light, and “z” is a value of the transmittance in the panel at a wavelength corresponding to a maximum value of the intensity in a range of wavelengths designated for red light.
    Type: Application
    Filed: October 2, 2008
    Publication date: February 12, 2009
    Inventors: Yuka Utsumi, Katsumi Kondo, Ikuo Hiyama, Osamu Itoh, Masahito Ohe, Kazuhiko Yanagawa, Keiichiro Ashizawa
  • Patent number: 7489374
    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: Grant
    Filed: December 23, 2004
    Date of Patent: February 10, 2009
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yuka Utsumi, Makiko Sugibayashi, Ikuo Hiyama, Katsumi Kondo, Mutsumi Maehara
  • Patent number: 7478925
    Abstract: A thin light source unit employs a plurality of light emitting diode chips in multiple colors to generate highly uniform white light at a low cost and with a high light utilization efficiency. The light source unit has light emitting diode chips, lead frames, and a transparent sealer. A plurality of the light emitting diode chips in the same color are connected in series to three or more sets of the lead frames. The light emitting diode chips in at least three different colors are integrally sealed with the transparent sealer. An illuminating apparatus using the light source units, and a display apparatus using the illuminating apparatus are also provided.
    Type: Grant
    Filed: November 3, 2005
    Date of Patent: January 20, 2009
    Assignee: Hitachi Displays, Ltd.
    Inventors: Ikuo Hiyama, Hiroki Kaneko, Toshiaki Tanaka, Tsunenori Yamamoto, Akitoyo Konno, Katsumi Kondo, Haruo Akahoshi
  • Publication number: 20080303998
    Abstract: A liquid crystal display device includes a pair of substrates with a liquid crystal layer therebetween with a plurality of scanning signal lines and of video signal lines being formed on a first substrate. The scanning and video signal lines are arranged in a shape of a grid, and a pixel region is defined as a region surrounded by the scanning and video signal lines. A black matrix is formed on a second substrate, is arranged in a position overlapped on the scanning and video signal lines, and has an opening portion in each pixel region. A plurality of first electrodes are provided on the first substrate, and a plurality of second electrodes are provided on the second substrate, wherein at least one of first electrodes and at least one of the second electrodes are arranged in a position overlapped with the opening portion.
    Type: Application
    Filed: March 12, 2008
    Publication date: December 11, 2008
    Inventors: Masuyuki OHTA, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Patent number: 7460103
    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: Grant
    Filed: February 9, 2005
    Date of Patent: December 2, 2008
    Assignee: Hitachi Displays, Ltd.
    Inventors: Akitoyo Konno, Masaya Adachi, Daisuke Kajita, Tsunenori Yamamoto, Katsumi Kondo, Tatsuki Inuzuka, Ikuo Hiyama, Yuka Utsumi
  • Patent number: 7433012
    Abstract: A liquid crystal display apparatus includes a liquid crystal panel including a pair of polarizers, and a back light provided at a back side of said liquid crystal panel. The liquid crystal panel is an active matrix type liquid crystal panel enabling display and has a characteristic of spectral transmittance required to satisfy the following equation, ×>y, when a drive voltage is applied thereto so as to vary from a dark state to a light state, in which “x” is a value of the transmittance in the liquid crystal panel at a wavelength which corresponds to one of 490 nm and 500 nm, and “y” is a value of the transmittance in the liquid crystal panel at a wavelength which corresponds to 545 nm.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: October 7, 2008
    Inventors: Yuka Utsumi, Katsumi Kondo, Ikuo Hiyama, Osamu Itoh, Masahito Ohe, Kazuhiko Yanagawa, Keiichiro Ashizawa
  • Publication number: 20080211984
    Abstract: An image display device designed to improve shock resistance and to eliminate external image reflection and blurring. In an liquid crystal display device are disposed a backlight, a polarizing plate on the backlight side and a liquid crystal panel held by two glass substrates and having electrodes, a liquid crystal layer, an alignment layer and a color filter therein. The image display device has a transparent front plate provided on the liquid crystal panel opposite from the backlight, a transparent organic medium layer provided between the front plate and the liquid crystal panel, and an antiglare layer provided on the front plate opposite from the transparent organic medium layer.
    Type: Application
    Filed: December 28, 2007
    Publication date: September 4, 2008
    Inventors: Makiko Sugibayashi, Hiroshi Sasaki, Katsumi Kondo, Kiyomi Nakamura, Yasushi Tomioka
  • Publication number: 20080192181
    Abstract: In a liquid crystal display comprising a liquid crystal layer, a pair of substrates between which the liquid crystal layer is arranged, a pair of polarizing plates arranged between which the substrates are arranged, and a light source arranged at an outside of the polarizing plates, the liquid crystal display further comprises a first transparent resin layer arranged between the liquid crystal layer and the light source and a second transparent resin layer to be arranged between the viewer and the liquid crystal layer, and a linear thermal expansion coefficient of the first transparent resin layer is smaller than that of the second transparent resin layer.
    Type: Application
    Filed: January 23, 2008
    Publication date: August 14, 2008
    Inventors: Kiyomi NAKAMURA, Hiroshi Sasaki, Makiko Sugibayashi, Yasushi Tomioka, Katsumi Kondo
  • Patent number: 7349049
    Abstract: A liquid crystal display apparatus includes a pair of substrates, a liquid crystal layer arranged therebetween, a plurality of electrodes formed on one substrate for applying an electric field substantially in parallel to a face of the substrate, a plurality of active elements connected to the electrodes, and an alignment control layer formed on a face of at least one of the substrates and being in contact with said liquid crystal layer. A surface of the alignment control layer which is in contact with the liquid crystal layer has stepped difference portions, and a ratio a/d between a height of a maximum one of the stepped difference portions and a maximum thickness d of said liquid crystal layer has a range of 0.02-1. The alignment control film is made from a polyamic acid obtained by reacting a diamine with an acid anhydride of 1,2,3,4-cycle butane-tetracarboxylic acid dianhydrides.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: March 25, 2008
    Assignee: Hitachi, Ltd
    Inventors: Katsumi Kondo, Yasushi Tomioka, Takao Miwa, Makoto Yoneya
  • Patent number: 7345729
    Abstract: A liquid crystal display device includes a pair of substrates with a liquid crystal layer therebetween, a plurality of scanning signal lines and a plurality of video signal lines formed on one of said pair of substrates, a plurality of first electrodes on the one of said pair of substrates and a plurality of second electrodes on the one of said pair of substrates to drive the liquid crystal by a voltage difference with respect to the first electrode. The first electrodes have a bent form, and the second electrodes have a rectangular form.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: March 18, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann