Patent ID: 6452580
Filing Date: 2002-09-17
Classification: G09G

Abstract:
An active matrix liquid crystal display device comprising a row and column array of liquid crystal display elements, each display element having an associated switching device, sets of row and column address conductors connected to the display elements via which selection signals and data signals respectively are applied to the display elements, a row drive circuit for applying selection signals to the row address conductors in respective row address periods and a column drive circuit for applying data signals to the set of column address conductors which column drive circuit is operable to apply the data signals for the display elements of a row to groups of column address conductors in sequence in respective group address periods, each group comprising a plurality of column address conductors with the column address conductors in a group being charged in the respective group address period according to the level of their relevant data signals, characterised in that the column drive circuit is arranged to charge during a row address period at least the last column conductor of a group in at least two separate charging periods with the second charging period for the at least last column conductor occurring after a charging period of the next group in the sequence.