Samsung is preparing the next generation of OLED displays dubbed M9, which will be used in the Galaxy S10. Buried at the bottom of a report of changes in chemical suppliers are details on the screens of the three variants. Samsung will reintroduce a flat screen option with the base 5.8" model. There will be a curved 5.8" option as well (the middle phone). The top-specced version will come with a curved 6.2" display. It's been a while: Samsung Galaxy S7 (flat) • Galaxy S7 edge (curved) As for the material suppliers, Samsung is working with new companies for the organic chemicals...
Source: https://www.gsmarena.com/samsung_to_reintroduce_flat_displays_with_the_galaxy_s10-news-34299.php
