Patent ID: 7408530

Claim:
An apparatus for driving a plasma display panel, comprising: a frame memory for storing (i−1) th (i is a positive integer) frame data; an inverse gamma control unit, coupled to the frame memory, for performing inverse gamma correction for i th frame data and the (i−1) th frame data received from the frame memory; a maximum gray level value output unit for extracting and outputting highest gray level value of the (i−1) th frame data; and a gain control unit for expanding the gray level of the (i−1) th frame data based on the following equation: Expansion Gray Level =MGL/FGL×Input Data wherein MGL is a highest gray level that can be expressed, FGL is the highest gray level value of the (i−1) th frame data, and Input Data corresponds to a gray level of the (i−1) th frame data input from the inverse gamma control unit.