Devices based on ultra-thin-films of solid-state phase-change materials (PCMs) provide an entirely new means of achieving bistable, bright, vividly coloured, switchable reflective surfaces. In this paper, we outline the electro-optic mechanism underpinning these devices, discuss their unique potential to enable a new class of video capable colour reflective displays, and present for the first time repeatable electrical switching of display-pixel sized PCM devices between two highly contrasting optical states.
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