PURPOSE: An electrowetting device is provided to enhance the light absorbing rate of the scattered light and re-scattered light of dye included in hydrophobic fluid and the optical density of the hydrophobic fluid. CONSTITUTION: A first electrode (120) is positioned on a lower substrate (110) and a second electrode (270) is positioned on an upper substrate (210) for facing each other. A hydrophobic insulating layer (130) is positioned on a first electrode (120). A first fluid (150) and a second fluid (170) are inserted between the lower and upper substrates. The first and second fluids can not be mixed as the first fluid is a nonconductive and nonpolar liquid and the second fluid is a polar liquid. The first fluid comprises a scattering enhancer (160) and color oil composed of solvent and dye.