Control system and control method for checking the function...

G - Physics – 09 – G

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G09G 3/00 (2006.01)

Patent

CA 2521737

The invention relates to a method and a measuring system for checking the function of liquid crystal displays comprising individual display segments, on the basis of the difference in the electrical capacitance Cseg of defective and intact display segments. The invention is based on the fact that the capacitance of the display segments is directly determined by measuring the stored electrical charge using a capacitance measuring method. According to the preferred measuring method, a charge transfer is carried out by a reference capacitor Cref, and the segment capacitance Cseg is determined as a result of a charge balance, preferably by means of a .DELTA..SIGMA. conversion.

La présente invention concerne un procédé et un système de mesure qui servent à vérifier le fonctionnement d'affichages à cristaux liquides comprenant des segments d'affichage individuels, grâce à la différence de capacité électrique (Cseg) entre segments défectueux et segments intacts. Le procédé repose sur le fait que la capacité des segments d'affichage est déterminée au moyen d'un procédé de mesure de capacité, directement grâce à la mesure de la charge électrique accumulée. Le procédé de mesure préféré est un procédé au cours duquel un transport de charge s'effectue à travers un condensateur de référence (Cref) et la capacité (Cseg) du segment est déterminée grâce à un bilan de charge de préférence au moyen d'une conversion ?S.

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