Thanks again for the answers!
Quote:
Originally Posted by DNSB
As for the frontlight, it is distributed across the screen by light guides to give more even coverage and is intended to be reflected off the screen towards your eye.
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So these guides are valid only for visible light, right?
Quote:
Originally Posted by Ken Maltby
I don't see how this could be a problem, after all the greater IR exposure reflected into your eyes from paper books read in sunlight, should have your eyes already covered in cataracts. The same if you read on your device without the frontlight on, but in the sunlight. There would be much more Solar IR reflected back directly into your eyes, by the white paper or the device's substrata than any produced by the touchscreen.
Luck;
Ken
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But I never read with the book under the sunlight. I understand that the rays of the LEDs are very small, but now my last curiosity is to understand if any ray reaches the eye or not. Some people say yes, others say no.
Quote:
Originally Posted by Ken Maltby
IR emissions, like any other light emission, travels only in a straight line.
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The difference between frontal and infrared light is visibility. I'm sorry but I can not understand why a blue light filter is needed if light "travels only in a straight line". Is it due to light guides? I've read somewhere that there is a layer of reflection in the screen, which is the most profound layer. Are they reflected by this layer?