How are the backlight built-into the macbook air 2013?

Is it built edge lit or back lit?  And i know its not using bulbs to light cause the display is too thin; so what are they using to light the monitor up?  Thanks for the help guys

The MacBook Air uses an edge-lit display in whose lighting source is physically separate from the LCD panel. It is locate along the bottom edge and pushes light into the lightguide of the display. A backlit panel would be far too thick and expensive, using current technology.
Here are a couple of pics of the edge lighting strip.
http://i19.photobucket.com/albums/b163/bogielives/7A12A49F-46DE-4FAA-87DC-372D43 A9B897-1967-0000018274492B90_zpsb92befa8.jpg
http://i19.photobucket.com/albums/b163/bogielives/1E3AF8FA-957C-46B0-8D21-AE46C8 B21163-5584-0000038EDEF26888_zps5b047901.jpg

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