Open-structure electrowetting display with capacitive sensing feedback system

We report an open-structure electrowetting-based reflective display with capacitive sensing feedback that enables an effective self-dosing of ink, high contrast, and the precise control of color level. EWOD-based reflective display has been considered as a promising display technology due to high speed and contrast for e-paper application, but needs more improvements in effective packaging, enhanced contrast, and operation reliability. Here we introduce an EWOD display that can achieve such improvements via an open structure design and a capacitive feedback system. Our report includes the demonstration of quick and effective ink dosing process, off color area being ~ 8% of viewable area, and precision control of color area even under a large variation of interfacial tension.