ACTIVE MATRIX SUBSTRATE, DISPLAY DEVICE, AND METHOD FOR TESTING THE ACTIVE MATRIX SUBSTRATE OR THE DISPLAY DEVICE

摘要

An active matrix substrate includes a plurality of bus lines (1, 2) provided in a pixel region, a plurality of signal terminals (5) provided in a connection terminal region (K), connection lines (3), additional signal terminals (11), test lines (8), and switching elements (4). The switching elements (4) are divided into a plurality of groups, and can control connections between the bus lines and the test lines (8) on a group basis, and connection elements (12) that each include a diode or a switching element and connect the signal terminals (5) to each other are provided in the connection terminal region (K).