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: 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
  • Publication number: 20080018827
    Abstract: A lighting device for emitting light in a planar manner comprises a backlight section having non-uniformity in light emission in a plane and an optical film having an in-plane transmittance distribution compensating for the non-uniformity in light emission. The optical film has a plurality of slits allowing light to pass through and controls the in-plane transmittance distribution by varying the shapes of slit openings. Widths of the slits are fixed, closed portions are provided in a longitudinal direction, and the in-plane transmittance distribution is controlled by the ratio of the closed portions to the slits. A part of the optical film other than the slits is a light shielding layer, and a surface on the light source side of the light shielding layer scatters and reflects light. Each value in the in-plane transmittance distribution of the optical film is smaller than the reciprocal of a corresponding value in a light intensity distribution of the backlight section.
    Type: Application
    Filed: January 9, 2007
    Publication date: January 24, 2008
    Inventors: Tsunenori Yamamoto, Katsumi Kondo
  • Patent number: 7319465
    Abstract: For a display device having a solar cell and a power buffer for keeping stored electric power, a display system which has a low-power drive mode, self-contained power and no need for recharging or power wiring is provided. The display system includes a solar cell using a thin-film semiconductor, a power storage element for temporarily storing the produced power, a driving circuit, a matrix display unit, a display rewrite instruction unit for inputting screen rewrite and a control circuit and starts rewriting a display when power sufficient to rewrite an image screen is stored in the solar cell. The display device having remarkable portability and no limited battery life, which controls a display mode depending on the power produced by the solar cell, can display even when power generation is low and allows self-contained power even if the storage element has a small capacity, can be obtained.
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: January 15, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiro Mikami, Hiroki Kaneko, Yasuhiro Mochizuki, Katsumi Kondo
  • Patent number: 7297377
    Abstract: A liquid crystal display device having a pair of substrates, a liquid crystal layer filled between the pair of substrates and a plurality of pixel electrodes and common electrodes formed on one of the pair of substrates for supplying an electric field to the liquid crystal layer. The liquid crystal display device is configured so that a response time between a lowest brightness level and a highest brightness level is less than 16.7 ms, and the liquid crystal layer contains a range of 40% or more weight percentage to 100% or less weight percentage of a constituent component with a dielectric anisotropy of ???1.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: November 20, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Kagawa, Shintaro Takeda, Kotaro Araya, Sukekazu Aratani, Katsumi Kondo
  • Publication number: 20070229453
    Abstract: A liquid crystal display apparatus includes a liquid crystal display unit for displaying image signals, a lighting device including a light-adjustment unit for adjusting a quantity of light from a light source, which is transmitted to each of plural regions into which the lighting device is divided for illuminating corresponding plural illumination regions of an entirety of a display area of the liquid crystal display unit, and a control unit. The control unit controls each light-adjustment unit in synchronization with horizontal synchronization signals and vertical synchronization signals, so that the adjusted light quantity of individual ones of the plural regions of the divided lighting device is shifted among the plural regions and an individual illumination region of the plural illumination regions of the entirety of the display area of the liquid crystal display unit is correspondingly shifted therewith.
    Type: Application
    Filed: June 13, 2007
    Publication date: October 4, 2007
    Inventors: Sukekazu Aratani, Ikuo Hiyama, Masaya Adachi, Tsunenori Yamamoto, Katsumi Kondo
  • Patent number: 7256843
    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: August 11, 2003
    Date of Patent: August 14, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
  • Publication number: 20070178250
    Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N-I) of a liquid crystal composite forming the liquid crystal layer.
    Type: Application
    Filed: February 21, 2007
    Publication date: August 2, 2007
    Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
  • Patent number: 7245336
    Abstract: A liquid crystal display device includes an illumination device, a light control element arranged at a projected light side of the illumination device, a reflective polarizer arranged at an upper portion of the light control element so that the transmission axis of polarized light is adjusted, a liquid crystal display element for controlling polarization of projected light projected from the reflective polarizer, and a screen arranged at an upper portion of the liquid crystal display element. The light control element includes an isotropic medium without birefringence.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: July 17, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Ikuo Hiyama, Makoto Tsumura, Masaya Adachi, Katsumi Kondo, Jun-ichi Hirakata, Yuji Mori
  • Patent number: 7233304
    Abstract: A liquid crystal display apparatus comprises a liquid crystal display unit including a pair of substrates, at least one of which is transparent, a liquid crystal layer sandwiched by the pair of substrates, a plurality of electrodes for applying an electric field to at least one of the pair of substrates, and a plurality of active elements connected to the plurality of electrodes; a lighting device including a plurality of light sources; and a control unit for controlling ON/OFF of at least one light source for each of regions, into which the lighting device is divided, based on a display response of said liquid crystal display unit.
    Type: Grant
    Filed: March 22, 2000
    Date of Patent: June 19, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Sukekazu Aratani, Ikuo Hiyama, Masaya Adachi, Tsunenori Yamamoto, Katsumi Kondo
  • Patent number: 7209211
    Abstract: A liquid crystal display apparatus having a liquid crystal panel including a pair of substrates, a plurality of electrodes formed on at least one of the pair of substrates and a liquid crystal layer sandwiched between the pair of substrates, and a light source provided on one surface of the liquid crystal panel. An electric field in the liquid crystal layer produced by the plurality of electrodes is predominantly in parallel with surfaces of the pair of substrates. The light source has a luminous characteristic with a first chromaticity and the liquid crystal panel has a characteristic of spectral transmittance with a second chromaticity different from the first chromaticity so as to compensate for the color of the light source.
    Type: Grant
    Filed: July 30, 2003
    Date of Patent: April 24, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Yuka Utsumi, Katsumi Kondo, Ikuo Hiyama, Osamu Itoh, Masahito Ohe, Kazuhiko Yanagawa, Keiichiro Ashizawa
  • Publication number: 20070075947
    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: Application
    Filed: December 5, 2006
    Publication date: April 5, 2007
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Setsuo Kobayashi, Katsumi Kondo, Nagatoshi Kurahashi
  • Publication number: 20070064162
    Abstract: A liquid crystal display device includes a four-color conversion circuit with no chromatic changes in which the chromaticity and luminance of input image data are maintained, a four-color conversion circuit with chromatic changes in which the chromaticity and luminance of input image data are not necessarily maintained, and a selector for switching between the outputs from the two conversion circuits according to a level detection signal from a level detection circuit that detects whether the level of input image data is equal to 100% white level or higher. Display data from the selector is supplied to a liquid crystal section that displays an image by four-color pixels of red, green, blue, and white. The image data conversion circuit controls the light emission quantity of a backlight (BL) as white color, and converts input image data so that the level of data displayed on the liquid crystal section becomes uniform.
    Type: Application
    Filed: June 28, 2006
    Publication date: March 22, 2007
    Inventors: Tsunenori Yamamoto, Katsumi Kondo, Yuka Utsumi
  • Patent number: 7189439
    Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N-I) of a liquid crystal composite forming the liquid crystal layer.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: March 13, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
  • Publication number: 20070046874
    Abstract: A liquid crystal display device comprising a pair of substrates, a liquid crystal display panel having a liquid crystal layer positioned between the substrates, a transparent protective plate arranged on a front surface side of the display panel, and an optically transparent layer between the display panel and the protective plate, and wherein the protective plate includes fine concavity and convexity configurations on at least a surface thereof toward the display panel.
    Type: Application
    Filed: August 11, 2006
    Publication date: March 1, 2007
    Inventors: Masaya Adachi, Makiko Sugibayashi, Tetsuya Ohshima, Katsumi Kondo, Hiroshi Sasaki
  • Publication number: 20070035686
    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: October 24, 2006
    Publication date: February 15, 2007
    Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
  • Patent number: 7164402
    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: September 10, 2001
    Date of Patent: January 16, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Yanagawa, Yasushi Iwakabe, Yoshiaki Nakayoshi, Setsuo Kobayashi, Katsumi Kondo, Nagatoshi Kurahashi
  • Publication number: 20070002211
    Abstract: Manufacture of a liquid crystal display is disclosed. The liquid crystal display includes a backlight unit, a backlight unit-side polarizing plate, and a liquid crystal cell held by two glass plates, the liquid crystal cell having an electrode, a liquid crystal layer, an alignment layer, and a color filter arranged between the glass plates. The liquid crystal display also includes a transparent front plate arranged at a side of the liquid crystal cell opposite to the backlight unit, a polarizing plate attached to the liquid crystal cell, and a transparent organic medium layer arranged between the front plate and the liquid crystal cell. Since the front plate is provided at the outermost surface of an image display portion, and the transparent organic medium is filled between the front plate and the liquid crystal module, it is possible to achieve an improvement in wear resistance and a reduction in reflectance.
    Type: Application
    Filed: June 30, 2006
    Publication date: January 4, 2007
    Inventors: Hiroshi Sasaki, Makiko Sugibayashi, Yuka Utsumi, Yasushi Tomioka, Katsumi Kondo
  • Patent number: 7158202
    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 the pair of substrates, a plurality of first electrodes provided on the one of the pair of substrates, and a plurality of second electrodes provided on the one of the pair of substrates to drive the liquid crystal layer by a voltage difference with respect to the first electrode. The first electrode and the second electrode are arranged in different layers with an insulating layer therebetween. The first electrode has a bent form and each first electrode is connected by connecting portion in each pixel, and the connecting portion has an overlapping relation with at least one the second electrode and a signal line connected to the second electrode.
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: January 2, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Publication number: 20060285085
    Abstract: A projection-type display apparatus includes at least one light source for emitting three primary color lights, a display panel, a control circuit for controlling the display panel, an illumination light optical system for illuminating the display panel with the light emitted from the light source, and a projection lens for projecting the light modulated by the display panel. The illumination light quantity is modulated by a control signal generated according to a video signal in at least one of the illumination color lights among the three primary color lights and the upper limit of the dynamic range of the display panel is used without depending on the video signal.
    Type: Application
    Filed: June 15, 2006
    Publication date: December 21, 2006
    Inventors: Shoichi Hirota, Tsunenori Yamamoto, Katsumi Kondo, Akitoyo Konno