(19)
(11) EP 0 477 843 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.01.1993 Bulletin 1993/04

(43) Date of publication A2:
01.04.1992 Bulletin 1992/14

(21) Application number: 91116212.1

(22) Date of filing: 24.09.1991
(51) International Patent Classification (IPC)5: G09G 1/16
(84) Designated Contracting States:
DE FR GB

(30) Priority: 25.09.1990 JP 254895/90
18.10.1990 JP 279919/90

(71) Applicant: NEC CORPORATION
Tokyo (JP)

(72) Inventor:
  • Nakamura, Takaharu, c/o NEC Corporation
    Minato-ku, Tokyo (JP)

(74) Representative: VOSSIUS & PARTNER 
Postfach 86 07 67
81634 München
81634 München (DE)


(56) References cited: : 
   
       


    (54) Image display system


    (57) An image display system capable of moving, enlarging, reducing or otherwise manipulating an image being displayed on a screen. Display addresses are divided in the horizontal and vertical directions. A horizontal and a vertical display address conversion RAM (206,207) are each connected to respective one of display address buses so as to convert the display addresses in the horizontal or vertical direction. An additional bit representative of an image display timing may be assigned to each of conversion table data stored in horizontal and vertical address conversion RAMs (206,207) which are connected to particular one of a plurality of video memories (210).






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