Abstract: A thin film transistor array panel includes interconnection members interposed between the underlying gate pads made of an Al-containing metal and the overlying contact assistants made of a transparent conductor such as ITO thereon to prevent corrosion of Al due to ITO, or gate-layer signal transmission lines. Gate-layer signal transmission lines are directly connected to the data-layer signal transmission line to prevent corrosion of Al due to ITO in the thin film transistor array panel according to an embodiment of the present invention. The color filters are formed on the thin film transistor array panel to prevent misalignment between the two display panels so as to increase the aperture ratio.

Abstract: A display substrate includes a pixel, a signal transmission line, a first insulating layer and a test signal input part. The pixel is on an insulating substrate. The signal transmission line is on the insulating substrate to transmit an image signal. The first insulating layer is on the signal transmission line. The first insulating layer has a contact hole through which the signal transmission line is partially exposed. The test signal input part is on the first insulating layer, and includes an extended portion and a test signal pad. The extended portion is electrically connected to the signal transmission line through the contact hole, and is extended toward a side of the insulating substrate. The test signal pad is electrically connected to the extended portion. Therefore, the number of defects is decreased.