Patent ID: 8034414

Claim:
A printing process, comprising: providing a printing screen, wherein the printing screen comprises a plurality of printing units, and each of the printing units comprises a body and a protrusion structure, wherein the body has an ink aperture and the protrusion structure extends from a surface of the body into the ink aperture, each of the protrusion structures comprises a first protrusion and a second protrusion, the first protrusions are separated from the second protrusions, and each of the first protrusion and the second protrusion of the each of the protrusion structures is only connected to a single side of the ink aperture; providing a plurality of chambers; disposing the printing screen over the chambers with the ink apertures aligned with the chambers; and coating the ink liquid on the printing screen such that the ink liquid flows into the chambers through the ink apertures, wherein in each of the chambers, a temporary gap is formed between a portion of the ink liquid and a side wall of the chamber, and the gap is under the protrusion structure.