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: 8025939
    Abstract: A liquid crystal display is provided which is capable of reducing the occurrence of defective display due to variations in the initial alignment direction of a liquid crystal alignment control film in a liquid crystal display of an IPS scheme, realizing the stable liquid crystal alignment, providing excellent mass productivity, and having high image quality with a higher contrast ratio. The liquid crystal display has a liquid crystal layer disposed between a pair of substrates, at least one of the substrates being transparent, and an alignment control film formed between the liquid crystal layer and the substrate. At least one of the alignment control films 109 comprises photoreactive polyimide and/or polyamic acid provided with an alignment control ability by irradiation of substantially linearly polarized light.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: September 27, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yasushi Tomioka, Hidetoshi Abe, Katsumi Kondo
  • Publication number: 20110228199
    Abstract: A liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer sandwiched between the first and second substrates, and an orientation film formed on the first substrate. The orientation film has two orientation regions in a pixel, and the orientation regions are formed by polarized light.
    Type: Application
    Filed: June 3, 2011
    Publication date: September 22, 2011
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Patent number: 7956973
    Abstract: A liquid crystal display device includes a first substrate and a second substrate with a liquid crystal material sandwiched therebetween, neighboring first, second, third and fourth regions arranged in a rectangular shape and in a clockwise direction, the first, second, third and fourth regions having a first pixel electrode, a second pixel electrode, a third pixel electrode and a fourth pixel electrode, respectively. The first pixel electrode and the third pixel electrode extend in a parallel direction to one another, and the second pixel electrode and the fourth pixel electrode extend in a parallel direction to one another.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: June 7, 2011
    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: 20110128306
    Abstract: A liquid crystal display apparatus includes a white color light source and a coloring light source, a detection circuit which detects a brightness of an input image signal, an image quality processing calculation circuit, a light source control circuit, and an image control circuit. The coloring light source includes a blue light source. The image quality processing calculation circuit outputs to the light source control circuit a light source control signal for (1) increasing a light intensity of the coloring light source when an average luminance of the input image signal is detected to be higher than a predetermined luminance based on a detection result of the detection circuit, and for (2) turning-on only the white color light source without turning-on the coloring light source when the average luminance of the input image signal is detected to be lower than the predetermined luminance.
    Type: Application
    Filed: February 7, 2011
    Publication date: June 2, 2011
    Inventors: Yuka Utsumi, Yasushi Tomioka, Akitoyo Konno, Katsumi Kondo
  • Publication number: 20110102412
    Abstract: A liquid crystal display device includes one pixel in a liquid crystal display section comprises a plurality of sub-pixels, and each of the plurality of sub-pixels being driven by a transistor connected with a signal line. The plurality of sub-pixels include a first red sub-pixel, a second green sub-pixel, and a third blue sub-pixel, and a fourth sub-pixel which includes a display auxiliary area. Voltage-transmittance characteristics on the display auxiliary pixel area are shifted to a higher voltage in comparison with a voltage of the first to the third sub-pixels.
    Type: Application
    Filed: January 10, 2011
    Publication date: May 5, 2011
    Inventors: Tsunenori Yamamoto, Katsumi Kondo, Yuka Utsumi
  • Patent number: 7911541
    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: Grant
    Filed: June 28, 2006
    Date of Patent: March 22, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Tsunenori Yamamoto, Katsumi Kondo, Yuka Utsumi
  • Patent number: 7903195
    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: Grant
    Filed: August 15, 2008
    Date of Patent: March 8, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Hiroshi Sasaki, Makiko Sugibayashi, Yasushi Tomioka, Katsumi Kondo
  • Patent number: 7893903
    Abstract: A liquid crystal display apparatus having first white color light sources and blue and/or red second coloring light sources disposed on a back side of a liquid crystal panel, and an image quality processing calculation circuit for detecting a brightness of input image signals, in accordance with a detection result, controlling intensities of the first white color light sources and/or second coloring light sources and correcting pixel signals to be supplied to the liquid crystal panel.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: February 22, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yuka Utsumi, Yasushi Tomioka, Akitoyo Konno, Katsumi Kondo
  • Publication number: 20110019116
    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: September 28, 2010
    Publication date: January 27, 2011
    Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
  • Patent number: 7830474
    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: Grant
    Filed: January 9, 2007
    Date of Patent: November 9, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Tsunenori Yamamoto, Katsumi Kondo
  • Patent number: 7826022
    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: April 20, 2009
    Date of Patent: November 2, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Iwakabe, Masuyuki Ohta, Shigeru Matsuyama, Hitoshi Oaku, Katsumi Kondo
  • Patent number: 7804558
    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: Grant
    Filed: June 30, 2006
    Date of Patent: September 28, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Hiroshi Sasaki, Makiko Sugibayashi, Yuka Utsumi, Yasushi Tomioka, Katsumi Kondo
  • Publication number: 20100238377
    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 2, 2010
    Publication date: September 23, 2010
    Inventors: Hiroshi SASAKI, Makiko Sugibayashi, Yuka Utsumi, Yasushi Tomioka, Katsumi Kondo
  • Publication number: 20100225865
    Abstract: A liquid crystal display is provided which is capable of reducing the occurrence of defective display due to variations in the initial alignment direction of a liquid crystal alignment control film in a liquid crystal display of an IPS scheme, realizing the stable liquid crystal alignment, providing excellent mass productivity, and having high image quality with a higher contrast ratio. The liquid crystal display has a liquid crystal layer disposed between a pair of substrates, at least one of the substrates being transparent, and an alignment control film formed between the liquid crystal layer and the substrate. At least one of the alignment control films 109 comprises photoreactive polyimide and/or polyamic acid provided with an alignment control ability by irradiation of substantially linearly polarized light.
    Type: Application
    Filed: May 18, 2010
    Publication date: September 9, 2010
    Inventors: Yasushi TOMIOKA, Hidetoshi Abe, Katsumi Kondo
  • Patent number: 7790248
    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: February 21, 2007
    Date of Patent: September 7, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
  • Patent number: 7782423
    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: Grant
    Filed: January 23, 2008
    Date of Patent: August 24, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Kiyomi Nakamura, Hiroshi Sasaki, Makiko Sugibayashi, Yasushi Tomioka, Katsumi Kondo
  • Patent number: 7742137
    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: Grant
    Filed: August 11, 2006
    Date of Patent: June 22, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Masaya Adachi, Makiko Sugibayashi, Tetsuya Ohshima, Katsumi Kondo, Hiroshi Sasaki
  • Patent number: 7724334
    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: Grant
    Filed: March 12, 2008
    Date of Patent: May 25, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Masuyuki Ohta, Kazuhiko Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann
  • Patent number: 7718234
    Abstract: A liquid crystal display is provided which is capable of reducing the occurrence of defective display due to variations in the initial alignment direction of a liquid crystal alignment control film in a liquid crystal display of an IPS scheme, realizing the stable liquid crystal alignment, providing excellent mass productivity, and having high image quality with a higher contrast ratio. The liquid crystal display has a liquid crystal layer disposed between a pair of substrates, at least one of the substrates being transparent, and an alignment control film formed between the liquid crystal layer and the substrate. At least one of the alignment control films comprises photoreactive polyimide and/or polyamic acid provided with an alignment control ability by irradiation of substantially linearly polarized light.
    Type: Grant
    Filed: December 8, 2003
    Date of Patent: May 18, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yasushi Tomioka, Hidetoshi Abe, Katsumi Kondo
  • Publication number: 20100103361
    Abstract: A liquid crystal display device includes a first substrate and a second substrate with a liquid crystal material sandwiched therebetween, neighboring first, second, third and fourth regions arranged in a rectangular shape and in a clockwise direction, the first, second, third and fourth regions having a first pixel electrode, a second pixel electrode, a third pixel electrode and a fourth pixel electrode, respectively. The first pixel electrode and the third pixel electrode extend in a parallel direction to one another, and the second pixel electrode and the fourth pixel electrode extend in a parallel direction to one another.
    Type: Application
    Filed: December 30, 2009
    Publication date: April 29, 2010
    Inventors: Masuyuki OHTA, Kazuhiro Yanagawa, Kazuhiro Ogawa, Keiichiro Ashizawa, Masahiro Yanai, Nobutake Konishi, Katsumi Kondo, Masahito Ohe, Sukekazu Aratani, Hagen Klausmann