Patents by Inventor Hiroyuki Nakahara

Hiroyuki Nakahara 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: 6498431
    Abstract: In a display panel, the luminance and contrast are improved by making a partition semitransparent, which is a constituent element adjacent to a light-emitting section. A visible light incident on the partition proceeds inside the partition while being attenuated at a constant rate. When an external light incident on the partition from the front side is reflected off the bottom surface of the partition and returns to the front side again, the external light reciprocates inside the partition. Since the external light is largely attenuated by the reciprocation, the partition seemingly functions as an optical absorber with respect to the external light. A light emitted by the light-emitting section can transmit through the partition and radiate to the outside from the front side.
    Type: Grant
    Filed: September 11, 2000
    Date of Patent: December 24, 2002
    Assignee: Fujitsu Limited
    Inventors: Takashi Katayama, Yasuhiko Kunii, Shigeto Kurogi, Hiroyuki Nakahara, Akira Otsuka
  • Patent number: 6495957
    Abstract: A plasma display panel includes a plurality of row electrodes defining rows of a screen. The row electrodes are arranged at intervals so that adjacent row electrodes are capable of serving as an electrode pair for generating a surface discharge. Each of the row electrodes includes a belt-shaped base extending along the full length of the screen in a direction of the rows and protrusions extending from the base toward an adjacent row electrode in every column.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: December 17, 2002
    Assignee: Fujitsu Limited
    Inventors: Seiki Kurogi, Yoshitaka Ukai, Kenji Yoshida, Takashi Katayama, Hiroyuki Nakahara
  • Publication number: 20020008474
    Abstract: A plasma display panel includes a plurality of row electrodes defining rows of a screen. The row electrodes are arranged at intervals so that adjacent row electrodes are capable of serving as an electrode pair for generating a surface discharge. Each of the row electrodes includes a belt-shaped base extending along the full length of the screen in a direction of the rows and protrusions extending from the base toward an adjacent row electrode in every column.
    Type: Application
    Filed: February 25, 1999
    Publication date: January 24, 2002
    Inventors: SEIKI KUROGI, YOSHITAKA UKAI, KENJI YOSHIDA, TAKASHI KATAYAMA, HIROYUKI NAKAHARA
  • Patent number: 6297590
    Abstract: A surface discharge type plasma display panel(PDP) includes a pair of front and rear substrates (11, 21) with a discharge space (30) therebetween and a plurality of pair display electrodes on internal surface of either the front or rear substrate. The display electrodes are extending along each display line L. The PDP further includes a light shielding film (45), having a belt shape extending along the display line direction, formed on either internal or outer surface of the front substrate (11) to overlap each area S2 between the adjacent display lines L and sandwiched between the display electrodes X and Y.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: October 2, 2001
    Assignee: Fujitsu Limited
    Inventors: Toshiyuki Nanto, Hiroyuki Nakahara, Noriyuki Awaji, Masayuki Wakitani, Tsutae Shinoda, Keiichiro Konno, Yasuo Yanagibashi, Naohito Sakamoto
  • Patent number: 6242864
    Abstract: A plasma display panel of a matrix display type, having a first electrode and a second electrode which constitute a main electrode pair, the first electrode and the second electrode being covered with an insulating layer against a discharge gas, wherein the insulating layer comprises a magnesium oxide film formed at least as a surface layer thereof which is in contact with the discharge gas, the magnesium oxide film having an impedance in the range of 230 to 330 k&OHgr;/cm2 at a frequency of 100 Hz.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: June 5, 2001
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Nakahara, Takashi Katayama, Kazuhide Iwasaki, Manabu Ishimoto, Nobuhiro Iwase, Souichirou Hidaka, Akihiro Mochizuki
  • Patent number: 6242860
    Abstract: A plasma display panel has a first substrate, a plurality of address electrodes disposed on the first substrate, a first dielectric layer disposed on the first substrate in covering relation to the address electrodes, a second substrate, a plurality of scan electrodes disposed on the second substrate in a direction transverse to the address electrodes, a second dielectric layer disposed on the second substrate in covering relation to the scan electrodes. The first substrate and the second substrate are disposed in confronting relation to each other with discharge spaces defined therebetween. The first dielectric layer contains electrically conductive particles mixed therewith. The electrically conductive particles make the first dielectric layer electrically conductive in its transverse direction to allow charges stored on the first dielectric layer to leak to the address electrodes for thereby reducing the frequency of random discharges.
    Type: Grant
    Filed: March 6, 1997
    Date of Patent: June 5, 2001
    Assignee: Fujitsu Limited
    Inventors: Hiromichi Sasao, Hiroyuki Nakahara, Toshiyuki Nanto, Akira Otsuka, Noriyuki Awaji, Keiichi Betsui, Shinji Tadaki
  • Patent number: 6211614
    Abstract: An AC type plasma display panel having a first and a second electrode, each extending along a line direction and aligning along a row direction across a discharge gap therebetween, where is formed a display discharge cell. A third electrode extends along the row direction and intersects the first and second electrodes. Thus a display matrix is formed with the lines and the rows, and an address discharge cell is formed with the second electrode and the third electrode. Each of the first and second electrodes comprises a laminate of an electrically conductive transparent film stripe having a first side distant from the discharge gap and a second side near to the discharge gap with a metal film stripe thereon. A width of the metal film stripe is narrower than a width of the transparent film stripe. The metal film stripe has a third side distant from the discharge gap, and a fourth side near to the discharge gap.
    Type: Grant
    Filed: March 24, 1998
    Date of Patent: April 3, 2001
    Assignee: Fujitsu Limited
    Inventors: Takashi Katayama, Hitoshi Hirakawa, Seiki Kurogi, Hiroyuki Nakahara
  • Patent number: 6200182
    Abstract: A surface discharge type plasma display panel (PDP) includes a pair of front and rear substrates (11, 21) with a discharge space (30) therebetween and a plurality of pair display electrodes on internal surface of either the front or rear substrate. The display electrodes are extending along each display line L. The PDP further includes a light shielding film (45), having a belt shape extending along the display line direction, formed on either internal or outer surface of the front substrate (11) to overlap each area S2 between the adjacent display lines L and sandwiched between the display electrodes X and Y.
    Type: Grant
    Filed: April 13, 1999
    Date of Patent: March 13, 2001
    Assignee: Fujitsu Limited
    Inventors: Toshiyuki Nanto, Hiroyuki Nakahara, Noriyuki Awaji, Masayuki Wakitani, Tsutae Shinoda, Yasuo Yanagibashi, Naohito Sakamoto
  • Patent number: 6020687
    Abstract: A method for driving a plasma display panel includes carrying out an erase address operation when a display on the screen is renewed. The erase address operation includes the steps of carrying out an address preparation operation for producing the wall charge in all the discharge cells through a first step of generating a discharge only in a discharge cell in an ON-state and a second step of generating a discharge only in a discharge cell in an OFF-state, and carrying out an operation for selectively erasing the wall charge in a discharge cell other than a discharge cell corresponding to data of the image to be displayed.
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: February 1, 2000
    Assignee: Fujitsu Limited
    Inventors: Hitoshi Hirakawa, Nobuyoshi Kondo, Akira Otsuka, Takashi Katayama, Seiki Kurogi, Hiroyuki Nakahara
  • Patent number: 5952782
    Abstract: A surface discharge type plasma display panel(PDP) includes a pair of front and rear substrates (11, 21) with a discharge space (30) therebetween and a plurality of pair display electrodes on internal surface of either the front or rear substrate. The display electrodes are extending along each display line L. The PDP further includes a light shielding film (45), having a belt shape extending along the display line direction, formed on either internal or outer surface of the front substrate (11) to overlap each area S2 between the adjacent display lines L and sandwiched between the display electrodes X and Y.
    Type: Grant
    Filed: August 12, 1996
    Date of Patent: September 14, 1999
    Assignee: Fujitsu Limited
    Inventors: Toshiyuki Nanto, Hiroyuki Nakahara, Noriyuki Awaji, Masayuki Wakitani, Tsutae Shinoda, Keiichiro Konno, Yasuo Yanagibashi, Naohito Sakamoto