Patent ID: 7755713

Claim:
A peripheral circuit suitable for being disposed on a substrate having an active device array, the peripheral circuit being electrically connected to the active device array and comprising: a plurality of first lines; a plurality of second lines, wherein each of the first lines and each of the second lines are electrically connected to the active device array respectively; a plurality of first test pads, each of the first test pads comprising: a first conductive layer electrically connected to at least two of the adjacent first lines; a second conductive layer disposed on and electrically connected to the first conductive layer; a plurality of second test pads interposed between the first test pads and the active device array, each of the second test pads comprising: a plurality of third conductive layers, wherein the first lines pass through the third conductive layers, and each of the third conductive layers is electrically connected to one of the second lines respectively; and a fourth conductive layer disposed on and electrically connected to the adjacent third conductive layers, wherein the fourth conductive layer is insulated from the first lines.