(19)
(11) EP 0 593 012 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.05.1997 Bulletin 1997/19

(43) Date of publication A2:
20.04.1994 Bulletin 1994/16

(21) Application number: 93116496.6

(22) Date of filing: 12.10.1993
(51) International Patent Classification (IPC)5: G09G 1/16, G06F 3/14
(84) Designated Contracting States:
DE GB

(30) Priority: 13.10.1992 JP 274035/92

(71) Applicant: HITACHI, LTD.
Chiyoda-ku, Tokyo 100 (JP)

(72) Inventors:
  • Kohiyama, Tomohisa
    Totsuka-ku, Yokohama-shi (JP)
  • Yamagishi, Masami
    Zama-shi (JP)
  • Yamada, Takahiro
    Yokohama-shi (JP)
  • Kamo, Munekazu
    Hadano-shi (JP)
  • Nomi, Makoto
    Katsuta-shi (JP)
  • Iwai, Noriyuki, Hitachi Utsukushigaokaryo W232
    Midori-ku, Yokohama-shi (JP)
  • Minobe, Randy
    San Jose, Ca 95124 (US)
  • Jenney, Kim
    San Jose, Ca 95126 (US)

(74) Representative: Altenburg, Udo, Dipl.-Phys. et al
Patent- und Rechtsanwälte, Bardehle . Pagenberg . Dost . Altenburg . Frohwitter . Geissler & Partner, Galileiplatz 1
81679 München
81679 München (DE)

   


(54) Video picture display device and method for controlling video picture display


(57) A video picture written in the bit map memory (4) is displayed in a redetermined area on the display screen (70) of the display device (7) within the computer main body (100). The masking memory (2) having a bit number equal to or less than the number of the pixels of the video picture to be inputted is provided separate from the bit map memory (4). When the pixel data of the video picture data has been inputted, the input pixel data is selectively written in the bit map memory (4) based on the contents of the masking memory (2). In displaying a compressed picture of the input video picture on the display screen, an oblique line generating algorithm is used.






Search report