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Sony's device is a prototype - it's extremely unlikely ever to see the light of day as a manufactured product.
There is no evidence whatsoever, that I'm aware of, that backlit devices are bad for you. A photon is a photon as far as your eye is concerned, and it makes not the slightest different whether the photon is emitted by the screen or reflected from it. If you have evidence to say otherwise, I'd love to see it!
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