OLED screens are a unique kind of screen compared to LCD or LED screens. They have pixels that can produce their own light. They produce a large variety of colours with a high contrast. They are energy efficient to the point that they can shut down some pixel to produce black colours and allow the rest to produce other colours which can therefore save battery power.

Apple also said that it 2019 iPhone will have a better battery that will last longer. Therefore including an OLED screen can guarantee a long lasting battery on the 2019 iPhone.

The major problems about OLED screen is that they are too expensive and difficult to produce and the top manufacturer of OLED screens is LG. This was the reason why Apple skipped OLED screens until the introduction of the iPhone X.

If Apple truly has a plan for this then it no doubt that the 2019 iPhone will significantly be more expensive than the iPhone X. Apple has not confirmed this report yet but ET News has a good track on industry leaks so it could therefore be possible.

https://naijatechstar..com/2018/06/apple-is-planning-on-releasing-three.html?m=1