Apple has filed a patent for a dynamic-keyboard - where each key is lighted up by a LED. It's an interesting development considering Art.Lebedev is working on such a keyboard for a long time (the Optimus Keyboard). 

Read more here (Gizmodo) 

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Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters