Transistor and a liquid crystal display device

A deterioration in display quality due to the voltage applied to the display element changes, it is an object to provide a liquid crystal display device capable of reducing the uncomfortable feeling of the paper medium at the time of switching of the display. A first having a retention period of the first image signal writing period and the first image signal Writing a still image display period, the second still image display period to display by switching the first still image display period having a retention period of the second image signal writing period and a second image signal and duration, configured to have a write period of the second still image display period, the display controller to vary the length. .FIELD 1