Electrowetting displays use colored oil, they can theoretically display up to 16 million colors. This oil and water combination also lets you switch each pixel between a colored and a white (blank) state very quickly. The switch is so fast that electrowetting displays aren't just for catching up on your summer reading—they can play video as well. This is a huge advantage over electrophoretic displays, which switch so slowly you get an annoying flicker when you flip to the next page of your e-book.
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