A thin-film transistor includes a gate electrode having first and second gate electrode edges on opposed sides, and a drain electrode having a first edge that overlaps the first gate electrode edge, and a second edge that overlaps the second gate electrode edge. A diode array is fabricated by successive deposition of a conductive layer, a doped semiconductor layer and an undoped semiconductor layer adjacent to the substrate. A display pixel unit provides reduced capacitative coupling between a pixel electrode and a source line. The source line includes an extension that provides a source for the transistor. A patterned conductive portion is disposed adjacent to the source line. Another display pixel unit provides reduced pixel electrode voltage shifts using a source line and a balance line.