Looking at the answers to the original question, brightness and an antiglare screen are the best answers for device capabilities. OTOH, having used quite a few devices in direct sunlight, the best answer is not to bother since most LCD/OLED devices have high gloss screens that reflect the world around you. While my eInk devices are easily usable even on a beach, LCD/OLED devices are not meant for use in direct sunlight.
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