Patent ID: 8740338

Claim:
An ink jet print apparatus, comprising: first to third head portions configured to form red, green, and blue color filters on a substrate; a plurality of nozzles provided in each of the first to third head portions; a camera, above the substrate, configured to photograph a transmittance of each of sub-pixels in which the red, green, and blue are formed; a light emission unit, under the substrate opposite to the camera, configured to emit light on the sub-pixel; and an injection quantity control unit configured to compare the transmittance of each sub-pixel photographed by the camera with a previously prepared reference transmittance and to compensate the injection quantity of the nozzle, wherein the camera includes a plurality of charge coupled devices such that the transmittance of the red, green, and blue color filters measured all at once, wherein the injection quantity control unit includes a controller configured to identify a poor sub-pixel based on the transmittance of each sub-pixel photographed by the camera and a nozzle jet compensator configured to adjust the quantity of a color filter material which is injected into each poor sub-pixel and the injection quantity of the respective nozzle according to a compensation setting value which is calculated on the basis of the transmittance of the poor sub-pixel by the controller, wherein the each of the plurality of nozzles has the compensation setting value updated by the nozzle jet compensator and the injection quantity designated by the compensation setting value, and wherein the controller receives transmittance measurement data for each sub-pixel photographed by the camera, wherein the controller compares the transmittance measurement data of each sub-pixel, which is input from the camera, with a reference transmittance data and identifies poor sub-pixels having the transmittance measure data different from the reference transmittance data, and wherein the controller calculates the compensation setting value for the poor sub-pixels by to compare the transmittance of each sub-pixel photographed by the camera with a previously prepared reference transmittance.