The ink jet printing technique can be an alternative fabrication route for LCD color filters. The source of luminance nonuniformity in color filters fabricated by ink jet printing is described and methods to minimize this nonuniformity are presented. Both drop volume uniformity of the ink jet printhead and morphology of the printed color filter layer are important to achieve required luminance uniformity. Some practical methods to control the drop volume uniformity were tested and proposed. Morphological control of the printed color filter was also studied. Desirable interfacial energy between color filter and black matrix was modeled and tested using both plasma treatment and solution treatment.