An active device array substrate including a substrate, a plurality of pixel units, a plurality of first conductive lines, a plurality of second conductive lines, a lead line, at least one first electrostatic discharge protection circuit, and at least one second electrostatic discharge protection circuit is provided. A level shifter circuit includes a first level shifter unit, a second level shifter unit, and a latch unit. This conversion can be done using a finite-impulse-response filter.