COMMON VOLTAGE GENERATOR HAVING A SMALL AREA AND A HIGH EFFICIENCY, A DISPLAY DEVICE HAVING THE SAME, AND METHOD THEREOF, CAPABLE OF GENERATING A PLURALITY OF COMMON VOLTAGES BY USING A SWITCHING ELEMENT

摘要

PURPOSE: A common voltage generator having a small area and a high efficiency, a display device having the same, and method thereof are provided to reduce a chip size and costs by using a plurality of switching elements for selectively outputting a plurality of common voltages through one operational amplifier.;CONSTITUTION: In a common voltage generator having a small area and a high efficiency, a display device having the same, and method thereof, an operational amplifier(140) outputs an amplified voltage as a common voltage by amplifying the difference of a first input voltage and a second input voltage. Switch elements(141,143,149,151,153,155) supply a first voltage and a second voltage as a power source in a first common voltage output mode, and they supply a third voltage and a fourth voltage as a power source in a second common voltage output mode. A voltage divider(142) distributes a voltage between a first node and an output terminal connected between the output terminal and the first node. The voltage divider outputs the distributed voltage to the first input terminal as a first input voltage.;COPYRIGHT KIPO 2010