Abstract A large size panel manufacturing process for electrowetting display (EWD) by using surface treatment and ink‐jet printing (IJP) techniques had been developed. for hydrophilic rib fabrication, surface treatment technique was adopted to reinforce the adhesion of hydrophilic material on hydrophobic layer to achieve large‐Sized panel manufacturing. Also, for dosing of non‐polar liquid, IJP technique was used to dose the liquid into the unit pixel individually. By using IJP technique to dose the red, green, and blue oils, full color of EWD can be achieved without adopting color filter in the future. Here, a 6‐inch monochrome EWD prototype was successfully fabricated by using our proposed techniques.