Originally Posted by DaleDe
Well the LED's themselves are at the edge of light guide (to reduce the number of LED's needed) on portable devices but the light guide is still behind the screen and is usually defused a bit and there is a reflective surface on the bottom of the light guide to send as much light as possible through the LCD display. It behaves the same as if the LEDs themselves were behind the screen. (The light guide on a E Ink is in front of the screen and works differently)
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