An object of the present invention is to provide a display device in which a frame frequency does not decrease even in the case of employing a method for driving having little difference between reading time of a memory and writing time of a memory. According to the present invention, a reading device and a writing device are synchronized by determining allotment of two memories every cycle of a writing signal and by determining a start of reading through a start signal for writing and horizontal synchronizing signals.

 
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