Patents by Inventor Takehiko Nishida

Takehiko Nishida 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: 5917496
    Abstract: The present invention relates to a three-dimensional graphic display apparatus for performing a hidden surface removal and color blending, and particularly to a configuration of a special purpose memory for graphics and a configuration of a graphic display apparatus using the special purpose memory. The special purpose memory for graphics according to the present invention comprises a memory cell for holding intensity information (RGB) and window information about each pixel therein, an XY coordinate converter for converting XY coordinates of a pixel to be written to a memory address, an intensity blending processor, and hidden-surface removal and window comparators, all of which are formed on the same chip.
    Type: Grant
    Filed: April 14, 1998
    Date of Patent: June 29, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Ryo Fujita, Mitsuru Soga, Yasushi Fukunaga, Takehiko Nishida
  • Patent number: 5801706
    Abstract: A three-dimensional graphic display apparatus performs hidden surface removal and color blending. Particularly, the graphic display apparatus includes a configuration of a special purpose memory for graphics, thereby forming a configuration of a graphic display apparatus using the special purpose memory. The special purpose memory for graphics includes a memory cell holding intensity information (RGB) and window information about each pixel, an XY coordinate converter converting XY coordinates of a pixel to be written to a memory address, an intensity blending processor, and hidden-surface removal and window comparators, all of which are formed on the same chip.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: September 1, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Ryo Fujita, Mitsuru Soga, Yasushi Fukunaga, Takehiko Nishida
  • Patent number: 5706034
    Abstract: A graphic processing apparatus for generating, displaying or printing characters and graphic data. A successive column access is used in which a row address is designated for access to a memory and data in different column addresses within the designated same row address are successively accessed and buffer means for buffering a series of data between an access by a processor and an access to a memory is provided. A program and image information for display are stored in a main memory. A frame buffer and the main memory are integrally configured simply and small in size.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: January 6, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Koyo Katsura, Yasushi Fukunaga, Ryo Fujita, Kazuyoshi Koga, Takehiko Nishida
  • Patent number: 4958147
    Abstract: A graphic display processing system is disclosed, in which a two-dimensional pattern or an image of a three-dimensional pattern can be displayed on the display screen of a display device, and moreover it can be rapidly judged whether or not each graphic data on a display list formed in a graphic data buffer corresponds to a pattern in a pattern pick region (namely, pick aperture) set on the display screen. In more detail, display color data in the pick aperture is first read out of a frame memory for storing image data. In a case where an image of a three-dimensional pattern is displayed, depth values in the pick aperture are read out of a Z-buffer for storing depth values with respect to a displayed pattern.
    Type: Grant
    Filed: July 22, 1988
    Date of Patent: September 18, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Seiichi Kanema, Misato Nio, Yasushi Fukunaga, Takehiko Nishida