Digital micro-fluidic chip

The invention provides a digital micro-fluidic chip. The digital micro-fluidic chip comprises an active matrix thin film transistor array substrate, a discrete hydrophobic membrane, an upper cover plate, a hydrophobic membrane, liquid drops and silicone oil, wherein the liquid drops and the silicone oil are injected into space between the discrete hydrophobic membrane and the hydrophobic membrane; the active matrix thin film transistor array substrate comprises a plurality of thin film transistors; each thin film transistor comprises a grid electrode, a grid dielectric layer covering the grid electrode, a channel region which is located on the grid dielectric layer and located above the grid electrode, a source electrode and a drain electrode, wherein the source electrode and the drain electrode are located on the two sides of the channel region respectively and make contact with the channel region; and when the drain electrode and the grid electrode are projected to the same plane, a distance exists between