When the iPhone X was announced, Apple made a big switch in display technology. And the company doesn't seem to be interested in ever going back. The custom OLED screen on the latest iPhone should represent a sign of what's coming as the company has reportedly ordered a massive number of units to use in 2018.

Apple is expected to use the screens on the iPhone X but also some of the new iPhone models set to be released this year. The company ordered up to 130 million units, according to DigiTimes.

The entire order for displays came in at 250-270 million. While that means LCD screens are still dominating the inventory, it does indicate that Apple is going all-in on OLED screens less than a year after embracing the technology. Apple is already approaching the 50 percent mark for OLED screens.

Don't expect LCD screens to be abandoned soon, though. They're a lot cheaper to get and older iPhone models with the technology remain on the market.

For those iPhone models, Apple is said to have ordered up to 70 million units. The iPhone 8, iPhone 7, and iPhone SE use LCD screens since Samsung's custom panel only debuted with the iPhone X in late 2017. One of the next iPhone models should also have an LCD screen to remain affordable, but the other two likely to ship with OLED screens.

Then there's the possibility of an in-house display, but Apple probably won't have that ready for quite a few years.

The new iPhone models are believed to have 5.8-, 6.1-, and 6.5-inch displays.