Enlarge / The OLED-toting Google Pixel (left) next to the iPhone 7 Plus’ LCD panel. (credit: Ron Amadeo)

The iPhone 7 is just a couple of months old, which means that we are due for a fresh round of rumors about next year’s model. Today The Wall Street Journal reports that Apple is testing out “more than 10” different prototypes—presumably this includes not just next year’s phone, but prototypes for phones beyond that as well as some that will never see the light of day—and that at least one of those prototypes includes a curved OLED screen.

OLED screens are more expensive than equivalent LCDs, but they offer faster refresh rates and better contrast. They can also be made thinner than LCD displays since they don’t need separate layers for things like backlights or liquid crystal. Apple has always used LCD screens in its iPhones, but the company has reportedly asked suppliers like LG, Japan Display, and Sharp to submit prototype OLED displays for consideration.

OLED technology had lots of early teething issues, including poor color accuracy, greenish or purplish whites, and bad outdoor visibility, but many of those problems have been solved or substantially mitigated in recent years. In-depth analyses like those from DisplayMate have given top marks to the OLED screens in phones like Samsung’s Galaxy S7 and the now-discontinued Note 7.