Disclosed herein are novel 1,3-dihydro-5-isobenzofurancarbonitrile derivatives represented by Formula 1, or pharmaceutically acceptable salts thereof. With of the method, flaws can be detected and analyzed in near-real-time while the pipe is produced. The central processing unit is connected to the camera, the means for detecting a tower structure, and the storage unit. The second heating resistor suppresses the heat being transferred from the first heating resistor to the support. In other words, an analog signal and a digital signal are switched and input to a source driver. The heat sink assembly can also provide an electrical path from the IC die to the first surface of the substrate.