Why are OLED screens pentile and do they support full RGB patterns?

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Every topic on OLED that I can find generally explains what a pentile arrangement is and how it differs from RGB LCD displays. Instead I would like to know *why* display manufacturers use pentile patterns so frequently and is it possible to make an OLED RGB screen in use cases where it could be beneficial, like Virtual Reality displays?

In: Technology

PenTile is a trademark of Samsung.

Blue LEDs are the hardest to make, and the advantages of PenTile are: a) You only need one blue out of 5; b) the blue can be larger so that the amount of light produced is equal.

What are the VR benefits you’d expect from lower blue levels? I can’t think of any.