In　this　paper,　we　propose　a　driving　waveform　with　a　complex　ramp　pulse　for　an　electrowetting　display　system.　The　relationship　between　the　contact　angle　and　viscosity　of　inks　was　calculated　based　on　the　fluid-motion　characteristics　of　different　viscosities.　We　obtained　the　suitable　range　of　viscosity　and　voltage　in　the　liquid–oil–solid　three-phase　contact　display　system.　We　carried　out　model　simulation　and　driving　waveform　design.　The　result　shows　that　the　driving　waveform　improves　the　response　speed　and　aperture　ratio　of　electrowetting.　The　aperture　ratio　of　electrowetting　pixels　is　increased　to　68.69%.　This　research　is　of　great　significance　to　optimizing　the　structure　of　fluid　material　and　the　design　of　driving　waveforms　in　electrowetting　displays.　©　2023　by　the　authors.