Display substrate, method of manufacturing and display device comprising the substrate

摘要

A display substrate includes a pixel (PE), a signal transmission line (155), a first insulating layer (126) and a test signal input part (151). The pixel (PE) is on an insulating substrate (120). The signal transmission line (155) is on the insulating substrate (120) to transmit an image signal. The first insulating layer (126) is on the signal transmission line (155). The first insulating layer (126) has a contact hole (152) through which the signal transmission line (155) is partially exposed. The test signal input part (151) is on the first insulating layer (126), and includes an extended portion (151a) and a test signal pad (151b). The extended portion (151a) is electrically connected to the signal transmission line (155) through the contact hole (152), and is extended toward a side of the insulating substrate (120). The test signal pad (151b) is electrically connected to the extended portion (151a). Therefore, the number of defects is decreased.