Patent ID: 6961111

Claim:
A display device comprising: an active matrix substrate having a peripheral portion and a driver circuit section comprising a plurality of circuit elements and a plurality of polycrystalline silicon thin film transistors; a counter substrate; a liquid crystal material filled between the active matrix substrate and the counter substrate; and an individually-wired line array for supplying a clock signal, a data signal or electric power to the plurality of circuit elements in the driver circuit section, wherein the individually-wired line array is extended to the peripheral portion of the active matrix substrate, wherein: the peripheral portion of the active matrix substrate comprises a multi-layer bus line-equipped section having a bus line located on the insulator, the bus line is connected to the individually-wired line array via the via hole, and the bus line comprises a connecting terminal for connecting the display device to an external circuit; and the insulator is a pre-formed resin substrate having a bus line located on a surface thereof and a via hole in the substrate.