Recording head driving device and driving method

A driving method of a recording head in which plural ejector groups, at which plural ejectors which respectively eject liquid drops are disposed two-dimensionally, are disposed, with respect to a predetermined one direction, in a state in which a partial region of at least one end portion of each of the ejector groups, and a partial region of an end portion of an adjacent ejector group, mutually overlap one another in a direction orthogonal to the one direction, the driving method comprising:

• providing plural driving circuits, which drive corresponding ejector groups on the basis of inputted print data, in correspondence with the respective ejector groups;
• and
• inputting, to each of plural driving circuits, print data for driving the corresponding ejector group, in a state in which the print data driving the corresponding ejector group includes only print data driving ejectors which are included in a mutually-overlapping region of an ejector group adjacent to that ejector group.

A driving method of a recording head in which plural unit structures, which have ejector groups at which plural ejectors which respectively eject liquid drops are disposed two-dimensionally, are disposed, with respect to a predetermined one direction, in a state in which a partial region of at least one end portion of the ejector group, and a partial region of an end portion of an ejector group of an adjacent unit structure, mutually overlap one another in a direction orthogonal to the one direction, the driving method comprising:

• providing plural driving circuits, which drive ejector groups of corresponding unit structures on the basis of inputted print data, in correspondence with the respective unit structures;
• and
• serially inputting, to each of plural driving circuits and as the print data, print data which is such that an image to be recorded is substantially rectangular and which includes print data driving all of the ejectors disposed at the corresponding unit structure, in a state in which print data, which drives ejectors other than the ejectors disposed at the corresponding unit structure, are masked.