(19)
(11) EP 0 325 409 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.05.1990 Bulletin 1990/18

(43) Date of publication A2:
26.07.1989 Bulletin 1989/30

(21) Application number: 89300406.9

(22) Date of filing: 17.01.1989
(51) International Patent Classification (IPC)4: G09G 1/14, G09G 1/16
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 19.01.1988 GB 8801125

(71) Applicant: DU PONT PIXEL SYSTEMS LIMITED
Stevenage Hertfordshire SG1 4QN (GB)

(72) Inventors:
  • Trevett, Neil Francis
    Kingston upon Thames KT2 7AL (GB)
  • Wilson, Malcolm Eric
    Bridport Dorset (GB)
  • Lloyd, Sarah Jane
    Kingston upon Thames KT2 7AL (GB)

(74) Representative: Targett, Kenneth Stanley et al
D. Young & Co., 21 New Fetter Lane
London EC4A 1DA
London EC4A 1DA (GB)


(56) References cited: : 
   
       


    (54) Character generation


    (57) A system and method stores fonts and generates characters. Instead of the fonts containing bit maps, the storage area (116) for each character contains the addresses (GPCR Addresses) of instructions to be used to form the character, and the required parameters for those instructions. In a preferred embodiment, a lookup table (114) for the font contains, for each character, the address of the code to start executing and details of how much more information is stored for this character and where to find it. For each character, the stored information includes addresses of microcode instructions (126) followed by the required number of parameters to define the actions necessary for character generation.







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