EP 0435750 B1 19960306 - Addressing method for every column of a matrix LCD screen
Title (en)
Addressing method for every column of a matrix LCD screen
Title (de)
Verfahren zur Adressierung jeder Spalte eines rastergebildeten Flüssigkristallbildschirms
Title (fr)
Procédé d'adressage de chaque colonne d'un écran LCD de type matriciel
Publication
Application
Priority
FR 8917312 A 19891228
Abstract (en)
[origin: EP0435750A1] The present invention relates to an addressing method for every column (cl) of a matrix LCD screen comprising production of a control pulse by a transistor (3) driving the said column, the said pulse having a duration determined by the value of the sample of a video input signal, the said pulse acting on the conduction state of the said transistor in order to connect the said column to a supply terminal where a voltage ramp (2) is developed. In accordance with the method, two pulse durations are alternated, whose sum is predetermined and so that a given value of the sample of a video signal produces the same optical effect from one period to the next, differentiated excitation voltages are employed on at least one of the framing electrodes of the liquid crystal layer, namely the said column (cl) and its counter-electrode (CE). Application especially to active matrix LCD screens.
IPC 1-7
IPC 8 full level
G02F 1/133 (2006.01); G09G 3/20 (2006.01); G09G 3/36 (2006.01)
CPC (source: EP US)
G09G 3/2011 (2013.01 - EP US); G09G 3/3648 (2013.01 - EP US); G09G 3/3688 (2013.01 - EP US); G09G 3/3614 (2013.01 - EP US); G09G 2310/0259 (2013.01 - EP US); G09G 2320/0204 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0435750 A1 19910703; EP 0435750 B1 19960306; AT E135129 T1 19960315; DE 69025736 D1 19960411; FR 2656757 A1 19910705; FR 2656757 B1 19920320; JP 3034612 B2 20000417; JP H04136893 A 19920511; US 5319381 A 19940607
DOCDB simple family (application)
EP 90403695 A 19901220; AT 90403695 T 19901220; DE 69025736 T 19901220; FR 8917312 A 19891228; JP 41784990 A 19901227; US 4736093 A 19930419