Patent ID: 7696614

Claim:
A driver module structure comprising: a flexible circuit board provided with a wiring pattern; a semiconductor device mounted on the flexible circuit board; and an electrically conductive heat-radiating member joined to the semiconductor device, wherein the wiring pattern comprises a ground wiring pattern, the flexible circuit board has a cavity that exposes a portion of the ground wiring pattern, the exposed portion of the ground wiring pattern and the heat-radiating member are connected to establish electrical continuity via a member that is fitted into the cavity, an open portion in which the semiconductor device is not covered with the flexible circuit board is provided at a position where the semiconductor device is located, the open portion is an opening formed in the flexible circuit board, an accommodating portion for accommodating the semiconductor device is provided in the heat-radiating member at a position corresponding to the open portion, and the heat-radiating member is attached to the semiconductor device with a heat radiation agent.