Patent ID: 7347530
Filing Date: 2008-03-25
Classification: G02B,G02F,H01L

Abstract:
1. A method for printing, comprising: providing a substrate on which a matrix of color elements is defined, the color elements having respect center lines; positioning a printhead assembly over the substrate, the printhead assembly comprising multiple controllable nozzles; translating at least one of the substrate and the printhead assembly so that the printhead assembly scans over the substrate in a scan direction transverse to the center lines of the color elements; ejecting droplets of ink from the nozzles onto the substrate at selected times while the printhead assembly scans over the substrate; and selecting the times at which to eject the droplets so that the droplets are aimed to land on the color elements at respective locations, to a side of the center lines; wherein ejecting the droplets comprises actuating the nozzles so as to deposit two or more of the droplets on each of the color elements during a single pass of the printhead over the color elements; wherein actuating the nozzles comprises depositing the two or more of the droplets so that the two or more of the droplets overlap and coalesce within each of the color elements on the substrate; and wherein the two or more of the droplets are deposited within a time limit that is determined responsively to a drying rate of the ink.