(19)
(11) EP 0 206 330 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.12.1989 Bulletin 1989/52

(43) Date of publication A2:
30.12.1986 Bulletin 1986/52

(21) Application number: 86108655.1

(22) Date of filing: 25.06.1986
(51) International Patent Classification (IPC)4: G09G 1/00
(84) Designated Contracting States:
DE FR GB

(30) Priority: 26.06.1985 JP 137728/85

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

(72) Inventor:
  • Sakata, Yoshiaki Hitachi Shumeiryo
    Narashino-shi (JP)

(74) Representative: Beetz & Partner Patentanwälte 
Steinsdorfstrasse 10
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) Method for controlling screen display


    (57) Screen division display wherein a screen is divided into plural portions and an independent image is displayed on each divided portion, is achieved by the provision of a plurality of image memory areas (VCB,-VCB4) each corresponding to the screen; a display management memory area (DMM) for storing the positions on the screen of the storage contents of the image memory areas; and a display controller (DCT) for displaying the storage content of the designated image memory area on a predetermined divided portion of the screen, based on the storage content of the display management memory area. Further, there are provided a designating unit (14) for designating a desired one of the plural divided portions and a display management unit (WMG) for renewing the storage content of the display management area in such a way that the position on the screen of the image memory area corresponding to the divided portion designated by the designating unit is located on the entirety of the screen.






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