Patent ID: 8817011

Claim:
A drive device for driving a display panel through alternately applying a positive polarity gradation voltage and a negative polarity gradation voltage to the display panel, comprising: an amplifier unit for alternately switching and applying a gradation reference voltage with a positive polarity and a gradation reference voltage with a negative polarity to an input line, and for amplifying the gradation reference voltage with the positive polarity and the gradation reference voltage with the negative polarity to obtain an amplified gradation voltage; and a voltage generation unit for generating the positive polarity gradation voltage and the negative polarity gradation voltage according to the amplified gradation voltage, wherein said amplifier unit is arranged to select and apply to the input line one of the positive polarity gradation voltage and the negative polarity gradation voltage immediately before the amplifier unit switches between the gradation reference voltage with the positive polarity and the gradation reference voltage with the negative polarity, said one of the positive polarity gradation voltage and the negative polarity gradation voltage having a polarity the same as that of one of the gradation reference voltage with the positive polarity and the gradation reference voltage with the negative polarity to be applied to the input line after the amplifier unit switches between the gradation reference voltage with the positive polarity and the gradation reference voltage with the negative polarity.