(19)
(11) EP 1 052 614 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.07.2003 Bulletin 2003/29

(43) Date of publication A2:
15.11.2000 Bulletin 2000/46

(21) Application number: 00304064.9

(22) Date of filing: 15.05.2000
(51) International Patent Classification (IPC)7: G09G 3/34
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 14.05.1999 JP 13489999
10.03.2000 JP 2000067638

(71) Applicant: NGK INSULATORS, LTD.
Nagoya-City, Aichi Prefecture 467-8530 (JP)

(72) Inventors:
  • Takeuchi, Yukihisa
    Nishikamo-gun, Aichi-pref. 470-0204 (JP)
  • Nanataki, Tsutomu, Esupoa Toyoake VI
    Toyoake-city, Aichi-pref. 470-1112 (JP)
  • Ohwada, Iwao, NGK Takeda-Minamishataku 306
    Nagoya-city, Aichi-pref. 467-0873 (JP)
  • Akao, Takayoshi
    Kasugai-city, Aichi-pref. 487-0025 (JP)

(74) Representative: Paget, Hugh Charles Edward et al
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)

   


(54) Method and apparatus for driving a display device


(57) A display driving device drives a display which includes a plurality of actuators which control light emitted from specified parts of an optical wave guide plate. A first drive circuit controls the row electrodes, while a second drive circuit controls the column electrodes by outputting a data signal. The data signal includes a light emitting signal and a light extinguishing signal for each dot in the display, based on an input image signal. The column electrode drive circuit controls gradation only by a temporal modulation method. A signal processing circuit, which controls the first and second drive circuits, also controls brightness correction data. Brightness correction data are determined upon manufacture of the display and can be modified during the life of the display to correct for brightness deterioration.






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