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Schematic of electrowetting display and images of a tested sample. (a) Without voltage applied, a homogeneous oil film is present, showing the colored off-state. (b) With voltage applied, the oil film contracts, showing the white on-state. (c,d) The corresponding top view micrographs demonstrate a typical oil relaxation and contraction of a pixel. The size of the square pixel is 200 μm × 200 μm.
