Patent ID: 7862859

Claim:
A method of correcting for pattern run out in a desired pattern in directional deposition or etching comprising the steps of: providing a test substrate; providing a test stencil of known thickness on the test substrate; providing a stencil pattern extending through the test stencil to the test substrate; exposing the test substrate through the test stencil to a source of directional deposition or etching; comparing the stencil pattern to a pattern on the test substrate at a plurality of points along at least one direction to determine pattern run out at said points; fitting the measured pattern run out as a function of position to a function of the form Î” X=MX+C where Î”X=pattern run out, X=position on the substrate, M=Magnification and C=translational offset; providing a further substrate at a known position relative to the test substrate; providing a further stencil of known thickness; adjusting the magnification to allow for the difference in stencil thickness between the test stencil and the further stencil; adjusting the translational offset to allow for the difference in position of the test substrate and the further substrate along said direction; providing a desired pattern to be deposited or etched on the further substrate; correcting each point of the desired pattern by the inverse of the determined pattern run out at that point; providing the corrected desired pattern on the further stencil, the pattern extending through the further stencil to the further substrate; exposing the further substrate through the further stencil to the directional source of deposition or etching.