An apparatus includes a substrate, a thin-film-transistor (TFT) array, a circuit, driving lines, and straight signal lines. The substrate includes a first area and a second area. The TFT array is in the first area of the substrate. The circuit is in the second area of the substrate and in electrical communication with the TFT array. The driving lines are in the second area of the substrate between a first edge of the substrate and the circuit. The driving lines are in electrical communication with the circuit. The straight signal lines are aligned with and in electrical communication with the driving lines in the second area of the substrate. The straight signal lines extend to a second edge of the substrate perpendicular to the first edge.