Patent ID: 7088349

Claim:
A drive circuit for an electro optical device that includes a display portion having pixels arranged in a matrix and electro optical material, an optical transmittance ratio of the pixels being changed by applying voltage, supplying on-voltage to make the transmittance ratio saturated, or off-voltage to make the transmittance ratio non-transmissive to the display portion, and implementing sub-field drive to realize a gray-scale in response to the ratio of an optical transmissive state to a non-transmissive state of the electro optical material per unit time and time ratio, the drive circuit comprising; a data conversion device to place emphasis on responsiveness, the data conversion device driving each of the pixels within each sub-field, each sub-field being a control unit and formed by dividing a field into plural portions on a time axis, the data conversion device designating a sub-field for applying the off-voltage and a sub-field for applying the on-voltage in response to display data; and a data conversion device to place emphasis on gray-scale reproductiveness, the data conversion device driving each of the pixels within each sub-field, each sub-field being a control unit, the data conversion device designating a sub-field for applying the off-voltage and a sub-field for applying the on-voltage in response to the display data so that levels of gray-scale generated by the data conversion device placing emphasis on gray-scale reproductiveness are larger than levels of gray-scale generated by the data conversion device that places emphasis on responsiveness.