Patent ID: 8184083
Filing Date: 2012-05-22
Classification: G09G,H03K

Abstract:
1. An output buffer included in a source driver of a liquid crystal display (LCD) device, the output buffer comprising: a differential amplification unit generating control currents by amplifying a difference between voltages of an analog image signal and a signal output from the output buffer; and an output unit outputting a signal obtained by amplifying the analog image signal in response to the control currents; wherein an amount of bias current for driving the differential amplification unit increases and an amount of quiescent current flowing through the output unit decreases during a charge recycling period in which a source line of the LCD device is precharged to a precharge voltage, and wherein the amount of the bias current for driving the differential amplification unit decreases and the amount of the quiescent current flowing through the output unit increases during a driving period in which the amplified analog image signal is supplied to the source line after the source line is precharged.