Film formation method with deposition source position control
When a multiple-panel forming process for producing a plurality of panels on a large-size substrate is employed, when production thereof is continued over a long period, or in other cases, a predetermined film thickness distribution can be stably obtained according to a method of the present invention. Vapor deposition on a substrate is performed by evaporating particles from a vapor deposition source arranged opposite to the substrate in a vacuum chamber. By changing a distance between the substrate and an opening provided at the vapor deposition source by a vapor deposition source position control mechanism, change with elapse of time in the film thickness distribution of a thin film formed on the substrate is controlled.
1. A film formation method for forming a film on a substrate by discharging a vapor deposition material mounted on a vapor deposition source from the vapor deposition source arranged opposite to the substrate in a vacuum chamber, the film formation method comprising:
discharging the vapor deposition material from the vapor deposition source by heating the vapor deposition material;
detecting a pressure inside the vacuum chamber during the discharging of the vapor deposition material;
calculating a distance to be changed between an opening provided at the vapor deposition source and the substrate, based on a detection result of the pressure; and
changing the distance between the opening provided at the vapor deposition source and the substrate by moving the vapor deposition source along the direction normal to a surface of the substrate or moving the substrate along the direction normal to a surface of the substrate, based on the calculation result,
wherein when the pressure inside the vacuum chamber decreases with elapse of time, the distance is shortened, and
when the pressure inside the vacuum chamber increases with elapse of time, the distance is elongated.