A display driver apparatus and an inversion method thereof are provided. The display driver apparatus includes a gate drive unit, a source drive unit, a multiplexer unit and a common voltage generation unit. The gate drive unit is used to generate a gate signal for turning on/off sub-pixels. The source drive unit is used to generate a source signal required by the display panel. The multiplexer unit is used to regulate the sequence for the source signal to be delivered to the sub-pixels. The common voltage generation unit is used to generate a common voltage and switch the level of the common voltage during the enable period of the gate signal.