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Electrowetting reflective display has been widely studied since EWOD  was introduced. The electrowetting display has been suggested using two immiscible liquids such as colored oil and conductive liquid, normally the mixture of deionized water and some electrolytes . In this case hydrophilic grid walls prevent the colored oil from spreading over the neighboring cell, and render the conducting liquid easy to separate from the corner of the cell. This method, however, has some disadvantages such challenges in oil dosing process and relatively small viewable area ratio (VAR). Previous research has addressed these issues by introducing a self dosing method, and enhanced the VAR through the use of capillary forces.