Patent ID: 8167411

Claim:
A print element substrate comprising: a first print element array having a plurality of print elements; a second print element array having a plurality of print elements; a first driving circuit which divides the plurality of print elements included in said first print element array into a predetermined number of groups and time-divisionally drives print elements belonging to each group; a second driving circuit which divides the plurality of print elements included in said second print element array into a number of groups larger than the predetermined number of groups, and time-divisionally drives print elements belonging to each group; a first shift register circuit which holds data for driving the print elements belonging to said first print element array; a second shift register circuit and a third shift register circuit which divide a plurality of groups forming said second print element array into at least a first group set and a second group set, and hold data for driving the print elements belonging to each group set; and three signal lines which respectively transfer externally input signals to said first shift register circuit, said second shift register circuit, and said third shift register circuit.