To provide means which can flexibly deal with a display device employing a liquid drop discharge system/or a device according to the kinds of the manufacturing process steps to be applied.

The constitution/method for controlling a relative velocity V, a discharge period T and a diameter D so as to satisfy the relation VT<D are adopted when the relative velocity of a liquid drop discharge head to a wafer is defined as V, the discharge period of the liquid drops as T, and the diameter of the liquid drops after the liquid drops land on the wafer and expand to wet as D.