(19)
(11) EP 0 196 905 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.10.1989 Bulletin 1989/42

(43) Date of publication A2:
08.10.1986 Bulletin 1986/41

(21) Application number: 86302382.6

(22) Date of filing: 01.04.1986
(51) International Patent Classification (IPC)4: G09G 3/36
(84) Designated Contracting States:
DE FR IT

(30) Priority: 03.04.1985 GB 8508709

(71) Applicant: NORTHERN TELECOM LIMITED
Montreal, Quebec H2Y 3Y4 (CA)

(72) Inventors:
  • Ayliffe, Peter John
    Stanstead Essex (GB)
  • Davey, Anthony Bernard
    Bishops Storford Herts (GB)

(74) Representative: Dennis, Mark Charles et al
Nortel Limited Patents and Licensing West Road
Harlow, Essex CM20 2SH
Harlow, Essex CM20 2SH (GB)


(56) References cited: : 
   
       


    (54) Addressing liquid crystal cells


    (57) A method of addressing a matrix addressed ferroelectric liquid crystal cell is described that uses parallel entry of balanced bipolar data pulses on one set of electrodes to co-operate with serial entry of balanced bipolar strobe pulses on the other set of electrodes. The positive- and negative-going excursions of each data pulse are asymmetric, the excursion of one polarity having 'm' times the amplitude of the other and 1/mth the duration.






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