COMMON VOLTAGE DRIVING CIRCUIT OF LCD

摘要

PURPOSE: A common voltage driving circuit of an LCD is provided to reduce the generation of flicker due to a control error of a common voltage by using a voltage distributor to generate a reference voltage from an electric potential difference of the first gamma voltage and the second gamma voltage. CONSTITUTION: A common voltage driving circuit includes a voltage distribution portion(100) and a buffer portion(120). The voltage distribution portion selects the first gamma voltage(VG1) and the second gamma voltage(VG2) from plural gamma voltages and generates a reference voltage by the electric potential difference of the first gamma voltage and the second gamma voltage. The buffer portion stabilizes the voltage generated from the voltage distribution portion and generates a common voltage(Vcom). The voltage distribution portion includes the first and the second resistances(R1,R2) and a controller(110). The first and the second resistances are used for dividing the electric potential difference of the first gamma voltage and the second gamma voltage into two equal parts. The controller is used for controlling the electric potential of the reference voltage.