Evaporation method and apparatus thereof

An evaporation method, comprising:

• providing a substrate, wherein the substrate is rotating around an axis of rotation at the center of the substrate, said axis of rotation is perpendicular to a plane of the top surface of the substrate;
• defining a circle on the plane of the top surface of the substrate, wherein the center of said circle is the center of the substrate;
• providing a heater right under a point on the circle;
• providing a source supplying device, wherein the source supplying device supplies a metal wire as an evaporation source in a source supplying direction to a source evaporation point on the heater, such that a vertical line intersects said point on said circle and said source evaporation point;
• adjusting the source supplying direction of the source supplying device so that a projection of the source supplying direction on said plane of the top surface of the substrate is a tangent of the circle at said point on the circle;
• and
• heating the evaporation source by the heater for evaporation.