Driving circuit for display apparatus

A driving circuit for driving a display apparatus which includes pixels and data lines for applying voltages to the pixels and which displays an image with multiple gray scales in accordance with video data consisting of a plurality of bits, the driving circuit comprising:

• control signal generating means for generating a plurality of control signals in accordance with video data consisting of a plurality of bits;
• and
• a plurality of switching means, each of the plurality of switching means being supplied with a corresponding one of the plurality of control signals and a corresponding one of a plurality of gray-scale voltages generated by gray-scale voltage generating means, the gray-scale voltage supplied to the switching means being output to the data lines via the switching means in accordance with the control signal supplied to the switching means, wherein the control signal generating means includes:
• oscillating signal specifying means for receiving a plurality of oscillating signals and for defining a variable T to have a frequency corresponding to one of the plurality of oscillating signals, the received oscillating signals having respective duty ratios which are different from each other, wherein the variable T is determined in accordance with a value represented by bits selected from the plurality of bits of the video data, and for defining a variable T-bar which is obtained by inverting the variable T;
• gray-scale voltage specifying means for producing gray-scale voltage specifying signals which specify a first gray-scale voltage and a second gray-scale voltage among the plurality of gray-scale voltages, in accordance with a value represented by bits other than the selected bits of the plurality of bits of the video data;
• and
• output means for outputting a first control signal which oscillates at a duty ratio determined by the variable T to the switching means which are supplied with the first gray-scale voltage specified by the gray-scale voltage specifying signals and for outputting a second control signal which oscillates at a duty ratio determined by the variable T-bar to the switching means which are supplied with the second gray-scale voltage specified by the gray-scale voltage specifying signals.