It looks to me like some kind of transparent plastic with chemical substances in them that respond to blacklight.
The only thing you'll notice is that black-blacks will become more greyed out.
When shining a blacklight of upto 0.5W on such a screen should provide you enough light for reading at night.
I'm only saying it's blacklight, it could be regular light too. But blacklight also works well with certain white plastics, that may be used as lcd back!
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