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Gas cushion control of OVJP print head position

United States Patent

October 7, 2014
View the Complete Patent at the US Patent & Trademark Office
An OVJP apparatus and method for applying organic vapor or other flowable material to a substrate using a printing head mechanism in which the print head spacing from the substrate is controllable using a cushion of air or other gas applied between the print head and substrate. The print head is mounted for translational movement towards and away from the substrate and is biased toward the substrate by springs or other means. A gas cushion feed assembly supplies a gas under pressure between the print head and substrate which opposes the biasing of the print head toward the substrate so as to form a space between the print head and substrate. By controlling the pressure of gas supplied, the print head separation from the substrate can be precisely controlled.
Forrest; Stephen R. (Ann Arbor, MI)
The Regents of the University of Michigan (Ann Arbor, MI)
13/ 807,878
July 1, 2011
STATEMENT OF FEDERALLY-SPONSORED RESEARCH This invention was made with government support under Contract No. DE-SC0002122 awarded by The Department of Energy. The government has certain rights in the invention.