Patent ID: 8174543

Claim:
A display device driving circuit comprising: a grayscale signal output circuit configured to output a plurality of complementary signals as a digital grayscale signal; a plurality of grayscale signal lines configured to receive said plurality of complementary signals; a grayscale voltage output circuit configured to output a plurality of analog grayscale voltages; a plurality of grayscale voltage lines configured to receive said plurality of analog grayscale voltages; a digital-analog conversion circuit configured to select and output one of said plurality of analog grayscale voltages supplied through said plurality of grayscale voltage lines in response to said plurality of complementary signals supplied through said plurality of grayscale signal lines; a first switch configured to shut off a first connection path between said grayscale signal output circuit and said digital-analog conversion circuit through said plurality of grayscale signal lines; a second switch configured to shut off a second connection path between said grayscale voltage output circuit and said digital-analog conversion circuit through said plurality of grayscale voltage lines; and a third switch configured to connect a third connection path between one of a pair of said plurality of grayscale signal lines to the other, wherein said pair transfers a pair of said plurality of complementary signals.