Head unit arrangement method, liquid droplet ejection apparatus, method of manufacturing electro-optic device, and electro-optic device

A head unit arrangement method for arranging a plurality of head units in alignment in a Y-axis direction in a liquid droplet ejection device that plots an image in a matrix form with functional liquid droplets in a number n of colors by performing the number n of primary scans for plotting by moving the plurality of head units relatively to a workpiece in an X-axis direction and a number (n−1) of secondary scans for moving the plurality of head units by a space equivalent to a divisional plotted line relatively in the Y-axis direction, with the plurality of head units being arranged in alignment in the Y-axis direction, each having a carriage equipped with functional liquid droplet ejection heads respectively for the number n of colors for forming a plurality of divisional plotted lines for each of the colors in the Y-axis direction with each nozzle row while staggered in the Y-axis direction on the carriage, the head unit arrangement method comprising:

• evaluating liquid droplet ejection performance of each of the head units based on an inspection result of a volume of liquid droplet ejection from each of the functional liquid droplet ejection heads to arrange two of the head units that exhibit the lowest liquid droplet ejection performance at both ends in the Y-axis direction.