A driving integrated circuit (driving IC) connected to a display panel by a chip on glass (COG) method includes a pair of bumps electrically coupled to a test pad of the display panel; a power source electrically coupled to a first bump of the pair of bumps; a circuit device electrically coupled between a ground terminal and a second bump of the pair of bumps; and a node measuring unit for measuring a voltage at a node between the second bump and the circuit device.