A transmission image data signal including: a coded data block obtained by performing an error correction coding on a sequence of pixel data pieces in input image data; and a representative pixel data pieces group containing three pixel data pieces corresponding to red, green, and blue, respectively, in the sequence of the pixel data pieces is transmitted to a driver in a display panel. The driver converts the sequence of the pixel data pieces obtained by performing an error correction on the transmission image data signal to pixel driving voltages and applies these voltages to the display panel. If pixels for one horizontal scanning line have an identical color, the driver performs no error correction. Instead, the driver converts the representative pixel data pieces group to pixel driving voltages and applies these voltages to the display panel.