The casual user needs just one screen, our poll shows. There is interest in a second screen, but it can't be just anything - ideally, the extra screen will be on the back and it will be eInk. The reasons range from checking notification to preserving battery, eInk is great for reading long texts and showing an Always on Display at no power cost too. It does, however, preclude using the second screen for main camera selfies (the low frame rate will be a pain). The Meizu Pro 7 was rumored to have an eInk screen, but it turned out that it's an AMOLED. There's YotaPhone, of course, but the...
Source: http://www.gsmarena.com/weekly_poll_results_a_second_screen_is_mostly_not_needed-news-26580.php
