Inkjet printer apparatus and method of driving the same

An inkjet printer apparatus comprising:

• a printing head comprising a plurality of nozzles which prints an ink in a plurality of pixels arranged as a matrix type in a target substrate;
• a control circuit which moves the printing head in an x-direction crossing an y-direction of a scan direction, and determines an optimal position for using a maximum number of nozzles of the plurality of nozzles;
• and
• a driving part which moves the printing head to the optimal position and moves the printing head along the y-direction in the optimal position,
• wherein the control circuit determines n pixels, among the plurality of pixels, arranged in the x-direction of the target substrate corresponding to an x-direction length of the printing head, to a pixel group,
• determines the optimal position of the printing head within an x-direction length of a first pixel, among the plurality of pixels, of the pixel group, and
• wherein the control circuit aligns an end portion of a first nozzle, among the plurality of nozzles, in the printing head and an end portion of the first pixel of the pixel group to determine an initial position, and
• determines the optimal position of the printing head using a reference shift value preset with respect to the x-direction length of the first pixel in the printing head.