A data converter divides input data into first subframe data and latter subframe data, and the latter subframe data is given to a data serial-parallel converter and serial-parallel converted. The first subframe data is given to a line memory group, and given to an overdrive operation circuit after a given delay. The latter subframe data converted into parallel data is given to a line memory group, and given to a data parallel-serial converter after a given delay, where it is parallel-serial converted, and then it becomes output data after the first subframe data outputted from the overdrive operation circuit.