Drive circuit for driving an image display unit

A drive circuit for driving a display unit comprising:

• a gray-scale level voltage generator for generating a plurality of gray-scale level voltages, said gray-scale voltages corresponding to magnitudes of possible video data in one-to-one correspondence in a non-linear region of characteristic of liquid crystal transmittance and corresponding to magnitudes of possible video data in one-to-n correspondence in a linear region of characteristic of liquid crystal transmittance where n is an integer larger than one;
• a gray-scale voltage selector block for responding to input video data to select one of said gray-scale level voltages;
• a judgement section for judging whether a magnitude of an input video data resides within the non-linear region or the linear region to output a judgement signal indicating the non-linear region or the linear region;
• and
• an output circuit for responding to said judgement signal to output said one of said gray-scale level voltages selected by said gray-scale voltage selector block when said judgement signal indicates the non-linear region and output one of said gray-scale voltages or an intermediate voltage when said judgement signal indicates the linear region, the intermediate voltage residing between two of adjacent gray-scale voltages.