Patents by Inventor Tomoo Takatani

Tomoo Takatani 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: 6490012
    Abstract: A liquid crystal display device having a touch panel that exploits a shutter effect of a liquid crystal layer includes an antiglare film placed behind the touch panel as seen by the viewer. The antiglare film fulfills the following three conditions: 0.3<Ra≦0.4; 50<Sm≦80; and 5≦H≦20; where Ra represents the center-line mean roughness (&mgr;m) of the surface of the antiglare film, Sm represents the irregularity interval (&mgr;m) of the surface, and H represents the haze value (%).
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: December 3, 2002
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Tomoo Takatani
  • Patent number: 6122026
    Abstract: A sufficiently wide viewing angle characteristic is obtained while a sufficient front contrast is ensured. With respect to the light transmitted by a polarizing plate and a phase difference plate before exiting from a liquid crystal display device, the viewing angle in the 12-6 o'clock direction is improved by a phase difference plate. By a light diffusing plate, a sufficient front contrast is ensured by causing the light to exit in the direction of the normal and the light is diffused in the 9-3 o'clock direction where the viewing angle is not improved by the phase difference plate. In the case where the light diffusing plate has a double refractivity, the liquid crystal display apparatus is arranged so that the light is transmitted by the light diffusing plate after transmitted by a polarizing plate.
    Type: Grant
    Filed: June 17, 1997
    Date of Patent: September 19, 2000
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tomoo Takatani, Takeyuki Ashida