A controller driver includes an overdrive processing unit generating corrected image data based on image data and image data of one frame previous to the image data, a data line driver generating a liquid crystal driving voltage, a roundabout route bypassing the overdrive processing unit and allowing the one frame previous image data to be input to the data line driver, a second expander outputting the one frame previous image data to one of a connection route to the overdrive processing unit and the roundabout route, a command controller supplying a moving/still image switching signal S1 for indicating switching between moving image display and still image display to the second expander. The second expander selects the connection route to the overdrive processing unit in displaying a moving image and selects the roundabout route in displaying a still image.