Abstract: A data driver, an apparatus and a method for reducing power on current thereof are disclosed. The invention is used to reduce the start-up current for the data driver. The data driver includes a high-voltage output circuit. The method comprises at least following steps. First, receiving a charge-sharing enable signal and a data-transfer signal, the data-transfer signal includes a plurality of data-transfer enable signals generated in sequence. There exists an interval between two adjacent data-transfer enable signals. After the charge-sharing enable signal has received at least an interval, a delay charge-sharing enable signal is output. After voltage-level shifted, the voltage of the charge-sharing enable signal is then output as the high-voltage charge-sharing enable signal to start the high-voltage output circuit.