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OLED displays are being test marketed in a few, relatively expensive, hand-held devices with short product design life and are a lot further than they were just a few years ago. Several very large corporations have been installing manufacturing lines of late but, even though the mother glass size (Gen 4) is capable of making a cost-efficient number of A4-size displays, there are still technical issues preventing them from being made in that size with acceptable performance, yield, and cost. LCDs, last I estimated, had over US$100B in prior and current factory investment world-wide. It's hard for OLED displays to get performance and yield up while pushing cost down so quickly.
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