Inkjet printing device, method for printing bipolar elements, and method for manufacturing display device

A method for printing bipolar elements, comprising

• preparing ink in which a plurality of bipolar elements are dispersed;
• supplying the ink to an inkjet head;
• discharging the ink from the inkjet head;
• measuring a number of the plurality of bipolar elements in the discharged ink;
• and
• adjusting an amount of droplet of the discharged ink from the inkjet head in case that the number of the plurality of bipolar elements in the discharged ink exceeds a reference value.

A method for manufacturing a display device, comprising:

• preparing a target substrate comprising a plurality of areas divided from each other and having a first electrode and a second electrode, each of the first electrode and the second electrode disposed in one of the plurality of areas,
• discharging ink onto the plurality of areas while controlling an amount of droplet of the discharged ink based on a number of light emitting elements dispersed in the ink;
• and
• seating the light emitting elements on one of the first electrode and the second electrode.