Slew rate boost circuit for output buffer and output buffer having the same

The present invention relates to an output buffer circuit for the output buffer slew boost circuit and a source driver having the same. Receiving a buffer input signal to provide a pull-up part and the buffer output signals and the pull-down operation receiving the buffer input signal of the first level and the second level of the phase opposite to that by a pull-up operation provides a buffered output signal at the first level in the output buffer having a pull-down part to the slew rate of a boost circuit which generates a first boost signal period to boost the pull operation of the pull-up portion of the output buffer to input a first input signal and second input signal a first comparator; And a second comparator for generating the first input signal and the second signal for the boost period to a second input signal input to boost the pull-down operation of the pull-down portion of the chulreok buffer.