Patents by Inventor Kunimasa Itakura

Kunimasa Itakura 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: 7619710
    Abstract: An in-plane switching mode active matrix type liquid crystal display device includes a first substrate, a second substrate located opposing the first substrate, and a liquid crystal layer sandwiched between the first and second substrates. The first substrate includes a thin film transistor, a pixel electrode each associated to a pixel to be driven, a common electrode to which a reference voltage is applied, data lines, a scanning line, and common electrode lines. Molecular axes of liquid crystal are rotated in a plane parallel with the first substrate by an electric field substantially parallel with a plane of the first substrate to thereby display certain images. The common electrode is composed of transparent material and are formed on a layer located closer to the liquid crystal layer than the data lines. The common electrode entirely overlaps the data lines except an area where the data lines are located in the vicinity of the scanning line.
    Type: Grant
    Filed: April 1, 2005
    Date of Patent: November 17, 2009
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Shinichi Nishida, Kimikazu Matsumoto, Takahisa Hannuki, Kunimasa Itakura
  • Patent number: 7518680
    Abstract: Disclosed is an in-plane switching active matrix type liquid crystal display with greater improvements on color shifting and contrast. The liquid crystal display comprises an in-plane switching type liquid crystal display panel having an active device substrate, an opposing substrate and a liquid crystal layer held sandwiched between the active device substrate and the opposing substrate, a first polarizer laid out on one side of the liquid crystal display panel, a second polarizer laid out on the opposite side of the liquid crystal display panel, first to third optical compensators placed in order between the liquid crystal display panel and the first polarizer, and a fourth optical compensator placed between the liquid crystal display panel and the second polarizer.
    Type: Grant
    Filed: December 1, 2006
    Date of Patent: April 14, 2009
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Kunimasa Itakura, Eriko Fujimaki
  • Patent number: 7446833
    Abstract: An in-plane switching mode active matrix type liquid crystal display device includes a first substrate, a second substrate located opposing the first substrate, and a liquid crystal layer sandwiched between the first and second substrates. The first substrate includes a thin film transistor, a pixel electrode each associated to a pixel to be driven, a common electrode to which a reference voltage is applied, data lines, a scanning line, and common electrode lines. Molecular axes of liquid crystal are rotated in a plane parallel with the first substrate by an electric field substantially parallel with a plane of the first substrate to thereby display certain images. The common electrode is composed of transparent material, and are formed on a layer located closer to the liquid crystal layer than the data lines. The common electrode entirely overlaps the data lines except an area where the data lines are located in the vicinity of the scanning line.
    Type: Grant
    Filed: December 29, 2004
    Date of Patent: November 4, 2008
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Shinichi Nishida, Kimikazu Matsumoto, Takahisa Hannuki, Kunimasa Itakura
  • Publication number: 20070076154
    Abstract: Disclosed is an in-plane switching active matrix type liquid crystal display with greater improvements on color shifting and contrast. The liquid crystal display comprises an in-plane switching type liquid crystal display panel having an active device substrate, an opposing substrate and a liquid crystal layer held sandwiched between the active device substrate and the opposing substrate, a first polarizer laid out on one side of the liquid crystal display panel, a second polarizer laid out on the opposite side of the liquid crystal display panel, first to third optical compensators placed in order between the liquid crystal display panel and the first polarizer, and a fourth optical compensator placed between the liquid crystal display panel and the second polarizer.
    Type: Application
    Filed: December 1, 2006
    Publication date: April 5, 2007
    Inventors: Kunimasa Itakura, Eriko Fujimaki
  • Patent number: 7164458
    Abstract: Disclosed is an in-plane switching active matrix type liquid crystal display with greater improvements on color shifting and contrast. The liquid crystal display comprises an in-plane switching type liquid crystal display panel having an active device substrate, an opposing substrate and a liquid crystal layer held sandwiched between the active device substrate and the opposing substrate, a first polarizer laid out on one side of the liquid crystal display panel, a second polarizer laid out on the opposite side of the liquid crystal display panel, first to third optical compensators placed in order between the liquid crystal display panel and the first polarizer, and a fourth optical compensator placed between the liquid crystal display panel and the second polarizer.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: January 16, 2007
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Kunimasa Itakura, Eriko Fujimaki
  • Publication number: 20060181663
    Abstract: Disclosed is an in-plane switching active matrix type liquid crystal display with greater improvements on color shifting and contrast. The liquid crystal display comprises an in-plane switching type liquid crystal display panel having an active device substrate, an opposing substrate and a liquid crystal layer held sandwiched between the active device substrate and the opposing substrate, a first polarizer laid out on one side of the liquid crystal display panel, a second polarizer laid out on the opposite side of the liquid crystal display panel, first to third optical compensators placed in order between the liquid crystal display panel and the first polarizer, and a fourth optical compensator placed between the liquid crystal display panel and the second polarizer.
    Type: Application
    Filed: April 10, 2006
    Publication date: August 17, 2006
    Inventors: Kunimasa Itakura, Eriko Fujimaki
  • Patent number: 6950165
    Abstract: An in-plane switching mode liquid crystal display device includes a substrate, a scanning line formed on the substrate, a data line formed above the substrate to cross the scanning line while interposing an insulation film between the data line and the scanning line, and a transparent common electrode interconnect line located farther the substrate than the scanning line and the data line and having a width longer than those of the scanning line and the data line, and further, formed to geometrically cover the scanning line and the data line. The construction of the device makes it possible to make all electric fields from the data line and the scanning line terminate on the common electrode interconnect line. Forming the common electrode interconnect line with a transparent conductive material maintains the aperture ratio of the device.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: September 27, 2005
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Kimikazu Matsumoto, Kunimasa Itakura, Shinichi Nishida
  • Patent number: 6933528
    Abstract: An in-plane switching mode active matrix type liquid crystal display device includes a first substrate, a second substrate located opposing the first substrate, and a liquid crystal layer sandwiched between the first and second substrates. The first substrate includes a thin film transistor, a pixel electrode, a common electrode, a data line, a scanning line, and a common electrode line. The scanning line and the common electrode line are formed in a common layer in parallel with each other. The common electrode overlaps the data line and the scanning line with an interlayer insulating film existing therebetween. The common electrode line is singly formed at either side about the scanning line. The common electrode is electrically connected to the common electrode line through a contact hole formed throughout the interlayer insulating film, and shields a gap formed between the scanning line and the common electrode line.
    Type: Grant
    Filed: April 2, 2003
    Date of Patent: August 23, 2005
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Kunimasa Itakura, Shinichi Nishida, Kimikazu Matsumoto
  • Publication number: 20050174521
    Abstract: An in-plane switching mode active matrix type liquid crystal display device includes a first substrate, a second substrate located opposing the first substrate, and a liquid crystal layer sandwiched between the first and second substrates. The first substrate includes a thin film transistor, a pixel electrode each associated to a pixel to be driven, a common electrode to which a reference voltage is applied, data lines, a scanning line, and common electrode lines. Molecular axes of liquid crystal are rotated in a plane parallel with the first substrate by an electric field substantially parallel with a plane of the first substrate to thereby display certain images. The common electrode is composed of transparent material and are formed on a layer located closer to the liquid crystal layer than the data lines. The common electrode entirely overlaps the data lines except an area where the data lines are located in the vicinity of the scanning line.
    Type: Application
    Filed: April 1, 2005
    Publication date: August 11, 2005
    Inventors: Shinichi Nishida, Kimikazu Matsumoto, Takahisa Hannuki, Kunimasa Itakura
  • Patent number: 6924863
    Abstract: An in-plane switching mode active matrix type liquid crystal display device includes a first substrate, a second substrate located opposing the first substrate, and a liquid crystal layer sandwiched between the first and second substrates. The first substrate includes a thin film transistor, a pixel electrode each associated to a pixel to be driven, a common electrode to which a reference voltage is applied, data lines, a scanning line, and common electrode lines. Molecular axes of liquid crystal are rotated in a plane parallel with the first substrate by an electric field substantially parallel with a plane of the first substrate to thereby display certain images. The common electrode is composed of transparent material, and are formed on a layer located closer to the liquid crystal layer than the data lines. The common electrode entirely overlaps the data lines except an area where the data lines are located in the vicinity of the scanning line.
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: August 2, 2005
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Shinichi Nishida, Kimikazu Matsumoto, Takahisa Hannuki, Kunimasa Itakura
  • Publication number: 20050117104
    Abstract: An in-plane switching mode active matrix type liquid crystal display device includes a first substrate, a second substrate located opposing the first substrate, and a liquid crystal layer sandwiched between the first and second substrates. The first substrate includes a thin film transistor, a pixel electrode each associated to a pixel to be driven, a common electrode to which a reference voltage is applied, data lines, a scanning line, and common electrode lines. Molecular axes of liquid crystal are rotated in a plane parallel with the first substrate by an electric field substantially parallel with a plane of the first substrate to thereby display certain images. The common electrode is composed of transparent material, and are formed on a layer located closer to the liquid crystal layer than the data lines. The common electrode entirely overlaps the data lines except an area where the data lines are located in the vicinity of the scanning line.
    Type: Application
    Filed: December 29, 2004
    Publication date: June 2, 2005
    Inventors: Shinichi Nishida, Kimikazu Matsumoto, Takahisa Hannuki, Kunimasa Itakura
  • Patent number: 6744482
    Abstract: In an in-plane switching (IPS) mode active matrix type liquid crystal display device, data lines 24 supplied with data signals, common electrode wiring portions 26a and 26b applied with a reference voltage, a common electrode 26, pixel electrodes corresponding to pixels to be displayed, scanning lines 28 supplied with scan signals and TFT's 50 are provided on an active element substrate 11. The common electrode wiring portions 26a and 26b are formed by using a first metal layer, extend in parallel to the scanning line and connected to a common electrode potential at a peripheral portion thereof. Protruded portions 299a and 299b are formed in at least one of the common electrode wiring portions 26a and 26b in such a way that the protruded portions are positioned on both sides of the data line 24 to be formed later. Unevenness of display of the display device is reduced and the aperture ratio thereof is improved.
    Type: Grant
    Filed: April 9, 2002
    Date of Patent: June 1, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Kimikazu Matsumoto, Takahisa Hannuki, Masashi Koike, Shinichi Nishida, Kunimasa Itakura
  • Patent number: 6727877
    Abstract: A liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer sandwiched between the first and second substrates, a plurality of scanning lines arranged on the first substrate, a plurality of signal lines arranged on the first substrate, a plurality of first switches arranged at intersections of the scanning lines and the signal lines, a plurality of pixel electrodes each electrically connected to each of the first switches, a plurality of opposing electrodes each arranged in parallel with each of the pixel electrodes, and a signal line driver which switches a first voltage for driving a positive pole and a second voltage for driving a negative pole at a predetermined interval in accordance with a gradation, and outputs the positive or negative driving voltage to the signal lines, the signal line driver compensating for the first and second voltages such that averages of the first and second voltages in each of gradations are different from one another.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: April 27, 2004
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Kunimasa Itakura
  • Publication number: 20040027525
    Abstract: An in-plane switching mode active matrix type liquid crystal display device includes a first substrate, a second substrate located opposing the first substrate, and a liquid crystal layer sandwiched between the first and second substrates. The first substrate includes a thin film transistor, a pixel electrode, a common electrode, a data line, a scanning line, and a common electrode line. The scanning line and the common electrode line are formed in a common layer in parallel with each other. The common electrode overlaps the data line and the scanning line with an interlayer insulating film existing therebetween. The common electrode line is singly formed at either side about the scanning line. The common electrode is electrically connected to the common electrode line through a contact hole formed throughout the interlayer insulating film, and shields a gap formed between the scanning line and the common electrode line.
    Type: Application
    Filed: April 2, 2003
    Publication date: February 12, 2004
    Applicant: NEC LCD Technologies, Ltd.
    Inventors: Kunimasa Itakura, Shinichi Nishida, Kimikazu Matsumoto
  • Publication number: 20030184699
    Abstract: An in-plane switching mode liquid crystal display device includes a substrate, a scanning line formed on the substrate, a data line formed above the substrate to cross the scanning line while interposing an insulation film between the data line and the scanning line, and a transparent common electrode interconnect line located farther the substrate than the scanning line and the data line and having a width longer than those of the scanning line and the data line, and further, formed to geometrically cover the scanning line and the data line. The construction of the device makes it possible to make all electric fields from the data line and the scanning line terminate on the common electrode interconnect line. Forming the common electrode interconnect line with a transparent conductive material maintains the aperture ratio of the device.
    Type: Application
    Filed: March 27, 2003
    Publication date: October 2, 2003
    Inventors: Kimikazu Matsumoto, Kunimasa Itakura, Shinichi Nishida
  • Publication number: 20030122991
    Abstract: Disclosed is an in-plane switching active matrix type liquid crystal display with greater improvements on color shifting and contrast. The liquid crystal display comprises an in-plane switching type liquid crystal display panel having an active device substrate, an opposing substrate and a liquid crystal layer held sandwiched between the active device substrate and the opposing substrate, a first polarizer laid out on one side of the liquid crystal display panel, a second polarizer laid out on the opposite side of the liquid crystal display panel, first to third optical compensators placed in order between the liquid crystal display panel and the first polarizer, and a fourth optical compensator placed between the liquid crystal display panel and the second polarizer.
    Type: Application
    Filed: December 27, 2002
    Publication date: July 3, 2003
    Applicant: NEC Corporation
    Inventors: Kunimasa Itakura, Eriko Fujimaki
  • Patent number: 6504523
    Abstract: An active-matrix LCD device drives the LCD panel by using a dot reversible driving technique. The switching between two sets of input signals or two resolution modes is conducted by applying a DC voltage between the pixel electrode and the common electrode in each pixel before restart of the image display of a switched signal. The DC voltage has the same polarity among the pixels in the pixel array to thereby reduce the flicker after the restart of the image display.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: January 7, 2003
    Assignee: NEC Corporation
    Inventors: Noriaki Sugawara, Kimikazu Matsumoto, Kunimasa Itakura, Tatsuya Shiki, Toshikazu Shimizu, Shoichi Kuroha, Shinichi Nishida
  • Publication number: 20020191138
    Abstract: In an in-plane switching (IPS) mode active matrix type liquid crystal display device, data lines 24 supplied with data signals, common electrode wiring portions 26a and 26b applied with a reference voltage, a common electrode 26, pixel electrodes corresponding to pixels to be displayed, scanning lines 28 supplied with scan signals and TFT's 50 are provided on an active element substrate 11. The common electrode wiring portions 26a and 26b are formed by using a first metal layer, extend in parallel to the scanning line and connected to a common electrode potential at a peripheral portion thereof. Protruded portions 299a and 299b are formed in at least one of the common electrode wiring portions 26a and 26b in such a way that the protruded portions are positioned on both sides of the data line 24 to be formed later. Unevenness of display of the display device is reduced and the aperture ratio thereof is improved.
    Type: Application
    Filed: April 9, 2002
    Publication date: December 19, 2002
    Applicant: NEC CORPORATION
    Inventors: Kimikazu Matsumoto, Takahisa Hannuki, Masashi Koike, Shinichi Nishida, Kunimasa Itakura
  • Publication number: 20020159016
    Abstract: An in-plane switching mode active matrix type liquid crystal display device includes a first substrate, a second substrate located opposing the first substrate, and a liquid crystal layer sandwiched between the first and second substrates. The first substrate includes a thin film transistor, a pixel electrode each associated to a pixel to be driven, a common electrode to which a reference voltage is applied, data lines, a scanning line, and common electrode lines. Molecular axes of liquid crystal are rotated in a plane parallel with the first substrate by an electric field substantially parallel with a plane of the first substrate to thereby display certain images. The common electrode is composed of transparent material, and are formed on a layer located closer to the liquid crystal layer than the data lines. The common electrode entirely overlaps the data lines except an area where the data lines are located in the vicinity of the scanning line.
    Type: Application
    Filed: February 22, 2002
    Publication date: October 31, 2002
    Applicant: NEC Corporation
    Inventors: Shinichi Nishida, Kimikazu Matsumoto, Takahisa Hannuki, Kunimasa Itakura
  • Publication number: 20020126076
    Abstract: A liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer sandwiched between the first and second substrates, a plurality of scanning lines arranged on the first substrate, a plurality of signal lines arranged on the first substrate, a plurality of first switches arranged at intersections of the scanning lines and the signal lines, a plurality of pixel electrodes each electrically connected to each of the first switches, a plurality of opposing electrodes each arranged in parallel with each of the pixel electrodes, and a signal line driver which switches a first voltage for driving a positive pole and a second voltage for driving a negative pole at a predetermined interval in accordance with a gradation, and outputs the positive or negative driving voltage to the signal lines, the signal line driver compensating for the first and second voltages such that averages of the first and second voltages in each of gradations are different from one another.
    Type: Application
    Filed: August 10, 2001
    Publication date: September 12, 2002
    Inventor: Kunimasa Itakura