Source driver and display device having the same

PURPOSE: A source driver and a display device including the same are provided to reduce power consumption in the display device by preventing the amplified voltage from being transmitted to a source line of a display panel. CONSTITUTION: A data latch(41) divides the latched image data into upper bits and lower bits. A switching signal generation circuit(43) generates a plurality of switching signals using one PWM signal selected in response to the lower bits among the plurality of PWM signals. A decoder(49) outputs one step gradation voltage signal selected in response to the upper bits among the step gradation voltage signals. An output circuit(53) outputs a specific gradation voltage level included in the step gradation voltage signal outputted from the decoder. A selection circuit outputs one PWM signal selected in response to the lower bits among the PWM signals.