With an improved light use efficiency, the light detection sensitivity of a thin film diode is increased even if the semiconductor layer of the thin film diode has a small thickness. The alignment marks provided in the insulation layers are formed by being alternately overlapped in two areas of a scribe line having a saucer, thereby, the area occupied by the alignment marks is reduced. The low latency communication channel may be utilized when implementing the transceiver is used in low latency applications.