Further, the traces a-W further includes several grounding traces a-G. The grounding traces a-G are adjacent to the power traces a-P, and serve as reference ground to the power traces a-P, to construct a loop. In respect of the power traces a-P and the high-speed signal traces a-S, the grounding traces a-G also serve as a shield against electromagnetic interference from adjacent electronic devices. In one embodiment, there are two grounding traces a-G. One of the grounding traces a-G is disposed between the second power trace a-P2 adjacent to the first power trace a-P1 and the high-speed signal trace a-S, and serves as the reference ground to the first power trace a-P1 and the second power trace a-P2. The other grounding trace a-G is disposed between the second power trace a-P2 adjacent to the display region 101 and the third power trace a-P3, and serves as the reference ground to the second power trace a-P2 and the third power trace a-P3. A width of the grounding trace a-G is in a range from 10 μm to 2.35 mm. In one embodiment, as shown in FIG. 4, the grounding traces a-G are in a first specified ground width K2, and the first specified ground width K2 is 10 μm. In other embodiment, as shown in FIG. 5, the grounding traces a-G are in a second specified ground width K3, and the second specified ground width K3 is 20 μm.