Abstract: Provided is a treatment liquid ejection method and apparatus capable of significantly increasing productivity and quality by greatly reducing a maintenance time of a head unit, the treatment liquid ejection method including (a) obtaining test image information by test-photographing a treatment liquid test-printed by a head unit, (b) generating nozzle-specific characteristic information by using the test image information, (c) generating print file information to be printed, in consideration of the nozzle-specific characteristic information, (d) reflecting recipe information of a substrate or the head unit to prepare the print file information in an outputtable state, and (e) printing, on the substrate by the head unit, the print file information to which the recipe information is reflected.

Abstract: In a method of inspecting liquid chemicals discharged from an ink jet head according to example embodiments, at least two laser beams may be irradiated onto the liquid chemicals discharged from the ink jet head, and the conditions of the liquid chemicals may be identified by detecting an interference pattern obtained from a laser scattering generated by passing the liquid chemicals through the at least two laser beams.

Abstract: In a method of inspecting liquid chemicals discharged from an ink jet head according to example embodiments, at least two laser beams may be irradiated onto the liquid chemicals discharged from the ink jet head, and the conditions of the liquid chemicals may be identified by detecting an interference pattern obtained from a laser scattering generated by passing the liquid chemicals through the at least two laser beams.