Patents by Inventor Koji Aoto

Koji Aoto 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).

  • Publication number: 20040070575
    Abstract: The object of the present invention is to provide a plasma display panel that contributes to reduction of loss costs by reducing the number of plasma display panels that need to be disposed of after performance evaluation tests. In order to achieve the object, the plasma display panel of the present invention comprises a front glass substrate and a rear glass substrate opposing each other, an image display cell field and an evaluation cell field that are both provided between the front and the rear glass substrates and are each sealed with an airtight sealing layer independently of the other cell field. Performance evaluation tests of the plasma display panel are performed by driving the evaluation cell field.
    Type: Application
    Filed: September 29, 2003
    Publication date: April 15, 2004
    Inventors: Kazuhiko Sugimoto, Kazuyuki Hasegawa, Hideaki Yasui, Hiroyoshi Tanaka, Koji Aoto, Hiroki Kono, Tadakazu Hayashi, Hajime Ikejima, Yoshinao Ooe, Masaaki Yamauchi
  • Patent number: 6603264
    Abstract: A plasma display panel has spaced apart and parallel first and second substrates. A base 5 glass layer is provided on one surface of the second substrate confronting the first substrate. A plurality of spaced apart parallel ribs are positioned on the base glass layer and between the first and second substrates. Each rib defines a channel with a neighboring rib. A plurality of phosphors capable of emitting light are provided, each of which is positioned a corresponding channel. In particular, the base glass layer and/or ribs are made of material substantially impermeable to and non-reflective of light.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: August 5, 2003
    Assignee: Matsushita Electric Industrial of Co., Ltd.
    Inventors: Kazunori Hirao, Koji Aoto, Yoshihito Tahara
  • Patent number: 6577069
    Abstract: An AC type plasma display panel is designed so as to have the relationships of Wb>Wg>Wr and Db>Dg>Dr, where Wb, Wg and Wr denote the widths of blue, green and red discharge cells and Db, Dg and Dr denote the widths of address electrodes (15b, 15g and 15r) corresponding to respective colors. As a result, it is possible to adjust the electric charge stored in the discharge cells due to a write discharge according to colors, thereby making complete lighting write voltages of the discharge cells uniform. This achieves the AC type plasma display panel with an excellent display quality that has less occurrence of erroneous discharge and discharge flicker and an improved white display quality.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: June 10, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Hirao, Kenji Kiriyama, Koji Aoto, Yoshihito Tahara, Taichi Shino, Koichi Wani
  • Patent number: 6577070
    Abstract: An AC type plasma display panel is designed so as to have the relationships of Wb>Wg>Wr and Db>Dg>Dr, where Wb, Wg and Wr denote the widths of blue, green and red discharge cells and Db, Dg and Dr denote the widths of address electrodes (15b, 15g and 15r) corresponding to respective colors. As a result, it is possible to adjust the electric charge stored in the discharge cells due to a write discharge according to colors, thereby making complete lighting write voltages of the discharge cells uniform. This achieves the AC type plasma display panel with an excellent display quality that has less occurrence of erroneous discharge and discharge flicker and an improved white display quality.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: June 10, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Hirao, Kenji Kiriyama, Koji Aoto, Yoshihito Tahara, Taichi Shino, Koichi Wani
  • Patent number: 6552486
    Abstract: A front substrate and a back substrate are placed opposing each other separated by a discharge space. The front substrate is made of a semitransparent material such as a dark color glass with a mean transmittance for visible light of 60 to 80%. On the front substrate, a group of electrodes including pairs of scanning electrodes and sustaining electrodes covered with a dielectric layer and a protective coating are provided. Data electrodes and spacers are formed on the back substrate, and phosphors are provided on the data electrodes towards the side of the spacers. A front filter, which is made of a semitransparent glass sheet with a mean transmittance for visible light of 60 to 80%, is disposed on the front side of the front substrate. The present invention realizes a display with less halation and high contrast. Also, a detection rate of a defect in electrodes, which are formed on the front substrate, improves.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: April 22, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Koichi Wani, Kazunori Hirao, Koji Aoto, Yoshihito Tahara
  • Patent number: 6424095
    Abstract: An AC type plasma display panel is designed so as to have the relationships of Wb>Wg>Wr and Db>Dg>Dr, where Wb, Wg and Wr denote the widths of blue, green and red discharge cells and Db, Dg and Dr denote the widths of address electrodes (15b, 15g and 15r) corresponding to respective colors. As a result, it is possible to adjust the electric charge stored in the discharge cells due to a write discharge according to colors, thereby making complete lighting write voltages of the discharge cells uniform. This achieves the AC type plasma display panel with an excellent display quality that has less occurrence of erroneous discharge and discharge flicker and an improved white display quality.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: July 23, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Hirao, Kenji Kiriyama, Koji Aoto, Yoshihito Tahara, Taichi Shino, Koichi Wani
  • Publication number: 20020079843
    Abstract: An AC type plasma display panel is designed so as to have the relationships of Wb>Wg>Wr and Db>Dg>Dr, where Wb, Wg and Wr denote the widths of blue, green and red discharge cells and Db, Dg and Dr denote the widths of address electrodes (15b, 15g and 15r) corresponding to respective colors. As a result, it is possible to adjust the electric charge stored in the discharge cells due to a write discharge according to colors, thereby making complete lighting write voltages of the discharge cells uniform. This achieves the AC type plasma display panel with an excellent display quality that has less occurrence of erroneous discharge and discharge flicker and an improved white display quality.
    Type: Application
    Filed: February 4, 2002
    Publication date: June 27, 2002
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Hirao, Kenji Kiriyama, Koji Aoto, Yoshihito Tahara, Taichi Shino, Kochi Wani
  • Publication number: 20020070676
    Abstract: An AC type plasma display panel is designed so as to have the relationships of Wb>Wg>Wr and Db>Dg>Dr, where Wb, Wg and Wr denote the widths of blue, green and red discharge cells and Db, Dg and Dr denote the widths of address electrodes (15b, 15g and 15r) corresponding to respective colors. As a result, it is possible to adjust the electric charge stored in the discharge cells due to a write discharge according to colors, thereby making complete lighting write voltages of the discharge cells uniform. This achieves the AC type plasma display panel with an excellent display quality that has less occurrence of erroneous discharge and discharge flicker and an improved white display quality.
    Type: Application
    Filed: February 4, 2002
    Publication date: June 13, 2002
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Hirao, Kenji Kiriyama, Koji Aoto, Yoshihito Tahara, Taichi Shino, Koichi Wani
  • Patent number: 6335591
    Abstract: A gas discharge display panel has front and rear plates. The plates are spaced apart from each other, thereby forming a chamber in which a discharge gas is contained. Also, both the front and rear plates are dark in color. Preferably, both the front and rear plates have a darkness of about 20% or more or a transparency of about 80% or less. This decreases halation of light, thereby preventing the mixing of colors. Also, the gas discharge display panel provides a high contrast and clear images to viewers.
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: January 1, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Hirao, Koji Aoto, Yoshihito Tahara
  • Patent number: 5841232
    Abstract: An AC plasma display panel includes a plurality of opaque scanning electrodes (3b, 3c) and maintaining electrodes (4b, 4c) which are parallel to each other, formed on a first glass substrate (1) at the display side of the display, a plurality of ribs (9) formed on a second glass substrate (7) and arranged orthogonally to the scanning and maintaining electrodes, a data electrode (8) formed on the second glass substrate (7), positioned between the ribs and arranged parallel to the ribs (9), wherein a discharge cell (2) is defined by dividing the space between two ribs (9) and includes at least two of the scanning electrodes (3b, 3c) and at least two of the maintaining electrodes (4b, 4c). The maintaining discharge is generated between the two scanning electrodes (3b, 3c) and the two maintaining electrodes (4b, 4c). Consequently, a discharge region can be widened without decreasing the opening ratio, and an AC plasma display panel with high brightness and high efficiency can be obtained.
    Type: Grant
    Filed: April 9, 1997
    Date of Patent: November 24, 1998
    Assignee: Matsushita Electronics Corporation
    Inventors: Kazunori Hirao, Toru Hirayama, Koji Aoto