OUTPUT BUFFER FOR MATCHING UP SLEW RATE AND DOWN SLEW RATE AND SOURCE DRIVER INCLUDING THE SAME

摘要

An output buffer for matching up and down slew rates and a source driver including the same are provided to improve image quality by implementing a compensation unit for the characteristic of transistors of the source driver. An output buffer includes a differential input circuit(510), a current add circuit(520), an output circuit(540), and a slew rate matching circuit(550). The differential input circuit converts differential voltage signals, which are inputted through positive and negative input terminals, into differential current signals. The current add circuit receives the differential current signals and generates bias currents. The output circuit amplifies the differential voltage signals in response to the bias currents and outputs the amplified differential voltage signals. The slew rate matching circuit compensates for parasite capacitance around PMOS(Positive channel Metal Oxide Semiconductor) transistors.