Patent ID: 7471263

Claim:
An apparatus for driving a plasma display panel, comprising: an error diffusion unit for diffusing error of data received from an inverse gamma correction unit; a gray scale inversion check unit connected to the inverse gamma correction unit, for checking whether a gray scale value of the data received from the inverse gamma correction unit is a gray scale value where a gray scale inversion phenomenon is generated, and generating a 1-bit control signal according to a result of the checking; an adder disposed between the error diffusion unit and the gray scale inversion check unit, for adding the 1-bit control signal to lower bits of the data received from the error diffusion unit; a compare unit for supplying lower bits received from the error diffusion unit to a dithering unit when the lower bits are all “1”, and for supplying the lower bits to the adder when the lower bits are not all “1”; and the dithering unit for performing dithering by using the lower bits received from the adder.