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A while back we reviewed the Phosphor E Ink watch, and today we posted a review of a watch that uses an OLED display. It was interesting to compare the two displays outside. Not surprisingly, the OLED is almost useless outside, but the E Ink looks great in direct sunlight:

APUS OLED watch outside vs E Ink photo

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ynvisible ink kit - create your own electrochrommic printed displaysynvisible ink kit - create your own electrochrommic printed displays