Patent ID: 8857940

Claim:
A liquid ejection apparatus comprising a liquid ejection head including: a plurality of ejection opening groups each constituted by two or more ejection openings and each configured to form one pixel by at least two liquid droplets ejected from the two or more ejection openings of a corresponding one of the plurality of ejection opening groups; a plurality of individual channels configured to respectively connect the plurality of ejection opening groups to a plurality of pressure chambers; and an energy-applying portion configured to apply energy to liquid in the plurality of pressure chambers such that the liquid droplets are ejected from at least one ejection opening group selected among the plurality of ejection opening groups, and a controller configured to control the energy-applying portion, wherein, in a case where a first recording period is defined as a time period required for a recording medium to move relatively to the liquid ejection head by a unit length corresponding to resolution of an image recorded on the recording medium, the controller controls the energy-applying portion to form one pixel by using at least (a) a first drive signal in which an ejection period of the liquid droplets ejected in the first recording period is a first ejection period, and (b) a second drive signal in which an ejection period of the liquid droplets ejected in the first recording period is a second ejection period different from the first ejection period.