Patent ID: 8256859

Claim:
A controller for controlling direct-write apparatus, the apparatus comprising at least one direct-write head with a plurality of direct-write channels for writing onto a substrate, at least one of said direct-write head and said substrate being moveable relative to the other in a writing direction, said head comprising a plurality of nozzles for said writing, said head being further positionable relative to said substrate by at least rotation about an axis substantially perpendicular to said substrate at a writing position of said head, said rotation to adjust a distance between a plurality of said nozzles in said lateral direction perpendicular to said writing direction to adjust a pitch of said writing by said nozzles during printing of said substrate; the controller comprising: a distortion data input to receive substrate distortion information characterising distortion of said substrate to be written; a distortion compensation module to determine, responsive to said distortion information, head adjustment data for controlling said head rotation to compensate for said substrate distortion; and an output to output data for controlling said printing apparatus responsive to said head adjustment data to perform said pitch adjustment during said printing of said substrate.