Why do LCD screens have polarizers?

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Tags

1. #applied
2. #polarized
3. #changing
4. #point
5. #light
6. #appears
7. #blocked
8. #longer
9. #orientation
10. #liquid
11. #slightly
12. #filter
13. #screen
14. #second
15. #causes
16. #emerges
17. #untwist
18. #parallel
19. #polarizing
20. #voltage
21. #crystals