Amplifier offset canceling within display panel driver

A data driver used for driving a display panel, comprising:

• a grayscale voltage generator circuit generating a plurality of grayscale voltages;
• and
• a drive circuitry selecting a selected grayscale voltage from said plurality of grayscale voltages in response to input display data, and outputting a data signal having a voltage level corresponding to said selected grayscale voltage to said display panel;
• wherein said grayscale voltage generator circuit comprises:
• an amplifier generating a voltage bias;
• and
• a voltage generator circuit generating said plurality of grayscale voltages from said voltage bias;
• wherein said amplifier is designed so that a polarity of an offset voltage of said amplifier is reversible;
• and
• wherein said polarity of said offset voltage of said amplifier is controlled so that said polarity of said offset voltage of said amplifier us used for driving a specific pixel of said display panel in a certain frame period is opposite to that of said offset voltage of said amplifier used for driving said specific pixel in another frame period.

A display panel drive method comprising:

• generating a voltage bias by an amplifier designed so that a polarity of an offset voltage of said amplifier is reversible;
• generating a plurality of grayscale voltages from said voltage bias;
• selecting a selected grayscale voltage from said plurality of grayscale voltages in response to input display data;
• and
• driving a pixel on a display panel by feeding a data signal having a voltage level corresponding to said selected grayscale voltage to said pixel,
• wherein said polarity of said offset voltage of said amplifier is controlled so that said polarity of said offset voltage of said amplifier used for driving a specific pixel of said display panel in a certain frame period is opposite to that of said offset voltage of said amplifier used for driving said c specific pixel in another frame period.