(19)
(11) EP 0 312 720 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.06.1990 Bulletin 1990/24

(43) Date of publication A2:
26.04.1989 Bulletin 1989/17

(21) Application number: 88112554.6

(22) Date of filing: 02.08.1988
(51) International Patent Classification (IPC)4: G09G 1/16, G09G 1/28
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 20.10.1987 US 110902

(71) Applicant: TEKTRONIX INC.
Beaverton Oregon 97077-0001 (US)

(72) Inventors:
  • Auel, Kendall Poul
    Wilsonville Oregon 97070 (US)
  • Delwiche, James Anthony
    Tualatin Oregon 97062 (US)

(74) Representative: Liesegang, Roland, Dr.-Ing. 
FORRESTER & BOEHMERT Franz-Joseph-Strasse 38
80801 München
80801 München (DE)


(56) References cited: : 
   
       


    (54) Double buffered graphics design system


    (57) A graphic display system comprises a video display controller including two similar frame buffer memories for alternatively receiving and storing incoming pixel data and for periodically refreshing a display on a screen selectively in accordance with pixel data stored by either one of the two frame buffer memories. While the video display controller periodically refreshes the screen display in accordance with the pixel data stored in a first of the frame buffer memories, incoming pixel data is stored in the second frame buffer memory. The video display controller begins periodically refreshing the screen display in accordance with the pixel data stored in the second frame buffer memory. Updated pixel data stored in the second frame buffer memory is then copied into the first frame buffer memory.







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