In this thesis, a low cost and low power consumption buffer amplifier for source driver has been proposed. To implement DA-converter with low-voltage process technology instead of high-voltage one in a traditional manner, this buffer reduces chip area and saves power efficiently. Another source driver is designed to speed up driving time and resolve distortion problems when driving a large Liquid Crystal Display panel, which uses augmented circuits at the tail part of the data lines of the panel to improve the driving capability.