Patent ID: 8007066

Claim:
A printing apparatus comprising: an output section that has a predetermined number of output terminals, and that outputs pixel data from each of the output terminals respectively; a cable that has the predetermined number of transmission lines for transmitting the pixel data that are outputted from the predetermined number of the output terminals respectively; a head that can eject a plurality of colors of inks, and that has nozzle groups for the respective colors of the inks; and a plurality of head controllers that cause the ink to be ejected from the nozzle groups based on the pixel data, a plurality of the head controllers each being provided corresponding to each of the colors of the inks, wherein the number of the output terminals is larger than the number of the colors of the inks, and at least one of the head controllers causes the ink to be ejected from the nozzle group of a corresponding color, based on the pixel data transmitted via two or more of the transmission lines, wherein each head controller is provided with a first input section and a second input section respectively, wherein the first input section and the second input section of the head controller that corresponds to a certain color are inputted with the pixel data transmitted by the transmission line respectively, wherein, of the head controller that corresponds to another color, the first input section is inputted with the pixel data transmitted by the transmission line, and the second input section is inputted with a signal of a constant potential, and wherein the head controller has a selection signal creation section that creates a plurality of selection signals, a signal selection section that selects the selection signal corresponding to the pixel data, from a plurality of the selection signals, and a switch that applies a drive signal to a drive element according to the selection signal selected by the signal selection section, wherein the signal selection section of the head controller, which is inputted with the signal of the constant potential to the second input section, selects the selection signal from a part of the selection signals of a plurality of the selection signals.