Electrowetting Display Protrusion for Stable Fluid States

The patent applies different wettability properties to different regions of the substrate surface. Specifically, a first region has a first wettability and a second region has a second wettability that is different from the first. This local differentiation creates distinct energy states that prevent backflow, as the fluid configuration becomes trapped in local minima corresponding to different display states, thereby maintaining both configuration stability and display reliability without requiring continuous voltage application.

The patent implements a self-service mechanism where the multi-wettability substrate structure automatically prevents backflow through its inherent physical properties. The different wettability regions create energy barriers that naturally maintain fluid configurations without requiring external intervention. This eliminates the need for periodic reset pulses, achieving reliable display states while minimizing energy consumption to only what is needed for initial state transitions.

The patent implements a surface with spatially varying wettability properties, where different regions exhibit different affinities for the fluid. This local quality differentiation creates multiple stable equilibrium positions for the fluid interface, enabling the system to maintain distinct display states. The increased functional complexity is achieved through surface property modulation rather than bulk structural changes, keeping the overall device architecture relatively simple while achieving multi-state stability.