Display driver and semiconductor device

A semiconductor device comprising a display driver configured to drive a display device having n (n is an integer of 2 or more) data lines, the semiconductor device comprising:

• a plurality of gradation voltage generation circuits each configured to generate a plurality of gradation voltages;
• first to n-th DA converter circuits each configured to select and output a gradation voltage corresponding to a luminance level indicated by pixel data from said plurality of gradation voltages generated by one of the gradation voltage generation circuits;
• first to n-th amplifiers configured to independently amplify n gradation voltages outputted from said first to n-th DA converter circuits, to generate n amplified gradation voltages;
• and
• an output selector configured to receive a mode signal indicating a normal mode or a power save mode and to output said n amplified gradation voltages from n output terminals, respectively, when said mode signal indicates said normal mode, wherein
• when said mode signal indicates said power save mode, said plurality of gradation voltage generation circuits, except for one gradation voltage generation circuit, stop generating the gradation voltages, and
• when said mode signal indicates said power save mode, in each of divisions into which said n amplified gradation voltages are divided into groups each containing k (k is an integer of less than n) amplified gradation voltages, said output selector outputs one of k amplified gradation voltages from k output terminals, and opens an output terminal of each of the amplifiers, except for an amplifier configured to generate said one of k amplified gradation voltages, out of k amplifiers configured to generate said k amplified gradation voltages.