Patent ID: 7880704

Claim:
Display device comprising: a liquid crystal material between a first substrate provided with row electrodes and a second substrate provided with column electrodes, in which overlapping parts of the row and column electrodes define pixels; driving means for driving the column electrodes in conformity with an image to be displayed, wherein column voltages G j (t) are supplyable to the column electrodes, wherein the column voltages G j (t) to be supplied are selectable from a predetermined number of column voltages levels; and driving means for driving the row electrodes, wherein the row electrodes supply groups of p rows (p>=1) with mutually orthogonal selection signals for driving pixels and the groups of p rows are driven for the duration of a row selection time p×n frc during a superframe including n frc frames for generating grey scales, wherein the row selection time is subdivided in n pwm sub selection time slots and the grey scales are coded in grey scale tables having n frc phases with n pwm sub selection time slots, wherein for the n frc frames of the superframe the grey scales are generated by using phase mixing, defining which phase of grey scale coding is used for a certain frame, wherein a column voltage G j (t) is calculated depending on the grey scales to be displayed by the p concurrently driven pixels in a column and depending on the used mutually orthogonal selection signals F i for the corresponding group of rows, wherein a change in the column voltage level is defining a transition, and wherein the column voltage GM) to be supplied to a column electrode has always less transitions per row selection time than the number n pwm of sub selection time slots of the row selection time.