Patent ID: 8685498

Claim:
A method for forming a coated film on a surface of the substrate by performing a relative movement between a substrate and a first printing head having a plurality of first discharge holes which are disposed along an identical first direction, and a second printing head having a plurality of second discharge holes which are disposed along an identical second direction, discharging a first discharge liquid from a first discharge hole, discharging a second discharge liquid from a first discharge hole and so as to land the first or the second discharge liquid on predetermined landing positions on the surface of the substrate, the method comprising steps of: making the first printing head and the second printing head face in a manner such that the first direction and the second direction become parallel, the first direction and the second direction cross a direction of the relative movement, and the second discharge holes disposed at the edge of the second printing head move along a moving path where at least one of the first discharge holes disposed at the edge of the first printing head moves along; disposing one of either the first printing head or the second printing head in front of the other to the direction of the relative movement; wherein the landing positions include a first landing position located on a first moving path where only the first discharge holes pass above, a second landing position located on a second moving path where only the second discharge holes pass above, and a third landing position located on a third moving path where both the first discharge holes and the second discharge holes pass above, wherein a plurality of the third landing positions is disposed in at least one row in the direction perpendicular to the direction of the relative movement, making the first discharge liquid land on the first landing positions; making the second discharge liquid land on the second landing positions; and making the first discharge liquid, the second discharge liquid or neither the first discharge liquid nor the second discharge liquid land on the third landing position disposed in one row, according to one landing condition selected by a random number from landing conditions including a first condition of which only the first discharge liquid lands, a second condition of which only the second discharge liquid lands, and a third condition of which neither the first discharge liquid nor the second discharge liquid lands.