Driver IC and inspection method for driver IC and output device

A driver IC comprising:

• a plurality of output pads;
• and a plurality of signal switch circuits, each of the signal switch circuits being provided on one of signal paths respectively connected to the output pads,
• wherein each of the signal switch circuits switches between a first state in which a signal from an upstream side of the signal path is allowed to pass through the signal switch circuit and a second state in which a level pattern of signals from the output pads is fixed to an inspection level pattern, according to a control signal;
• wherein the inspection level pattern includes a level pattern in which signals output from adjacent two of the output pads have different signal levels;
• the output pads are arranged along a long side of the driver IC in M rows (M is a natural number) which are arranged along a short side of the driver IC;
• the inspection level pattern includes a fixed pattern in which signals output from two of the output pads which are adjacent to each other in a direction of the long side of the driver IC have different signal levels;
• M is a natural number greater than one;
• and the inspection level pattern includes a fixed pattern in which signals output from two of the output pads which are adjacent to each other in a direction of the short side of the driver IC have different signal levels.