Why are OLED screens so expensive?

Related questions

1. Is OLED better than plasma?
2. Is there anything better than OLED?
3. Do black bars cause burn in OLED?
4. Is Sony OLED better than LG OLED?
5. Will OLED TV prices drop in 2019?
6. How many years does OLED last?
7. Is OLED the best technology?
8. What are the advantages of OLED?
9. Which OLED brand is the best?
10. Will OLED prices drop in 2019?

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