Liquid crystal display device and method and circuit for driving the same

A method for driving a liquid crystal display device,

• the liquid crystal display device including:
• a plurality of data signal lines;
• a plurality of scanning signal lines intersecting orthogonally with the plurality of data signal lines;
• pixel electrodes each provided at each of intersections of the plurality of data signal lines and the plurality of scanning signal lines;
• and
• a counter electrode provided so as to face the pixel electrodes,
• the plurality of data signal lines divided into sets each including data signal lines that are provided next to one another so as to respectively correspond to primary colors constituting a display color, the data signal lines in each of the sets being sequentially selected during a single horizontal scanning period,
• the method comprising the step of:
• varying a voltage, applied to the counter electrode, during the single horizontal scanning period in correspondence with a luminance of the primary color corresponding to the selected data signal lines, wherein
• the voltage applied to the counter electrode has polarities reversed from each other during two sequential horizontal scanning periods,
• in a case where the primary colors corresponding to selected ones of the plurality of data signal lines are same for horizontal scanning periods corresponding to an identical polarity, the voltage applied to the counter electrode is identical, and
• in a case where the primary colors corresponding to the selected ones of the plurality of data signal lines are same between any two horizontal scanning periods corresponding to the polarities different from each other, an absolute value of a difference between a center voltage and a positive voltage applied to the counter electrode is equal to an absolute value of a difference between the center voltage and a negative voltage applied to the counter electrode.

A circuit for driving a liquid crystal display device, the liquid crystal display device including:

• a plurality of data signal lines;
• a plurality of scanning signal lines intersecting orthogonally with the plurality of data signal lines;
• pixel electrodes each provided at each of intersections of the plurality of data signal lines and the plurality of scanning signal lines;
• and
• a counter electrode provided so as to face the pixel electrodes,
• the plurality of data signal lines divided into sets each including data signal lines that are provided next to one another so as to respectively correspond to primary colors constituting a display color, the sets each being connected to a data signal output line to which data signals each corresponding to one of the primary colors are supplied during a single horizontal scanning period by time division,
• the plurality of data signal lines, each corresponding to one of the primary colors, being sequentially selected so that data signal lines corresponding to one of the primary colors are selected at a time by a data line selection signal supplied in synchronization with a timing at which the data signals supplied to the data signal output line are switched,
• the circuit varying a voltage, applied to the counter electrode, during at least one horizontal scanning period, in synchronization with the timing and in correspondence with a luminance of the primary color corresponding to the selected data signal lines, the circuit varying the voltage in response to the data line selection signal, wherein
• the voltage applied to the counter electrode has polarities reversed from each other during two sequential horizontal scanning periods,
• in a case where the primary colors corresponding to selected ones of the plurality of data signal lines are same for horizontal scanning periods corresponding to an identical polarity, the voltage applied to the counter electrode is identical, and
• in a case where the primary colors corresponding to the selected ones of the plurality of data signal lines are same between any two horizontal scanning periods corresponding to the polarities different from each other, an absolute value of a difference between a center voltage and a positive voltage applied to the counter electrode is equal to an absolute value of a difference between the center voltage and a negative voltage applied to the counter electrode.