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According to WPCentral Q&A it’s a non-Pentile AMOLED display.

3 days ago on Lumia 920 vs. 925 vs. 928: Nokia's flagship trifecta in pictures

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This nano-fiber solar concept might help.
“the longer the better because the longer the light can travel along the fiber, the more bounces it will make and the more it will be absorbed.”
Read more at http://venturebeat.com/2009/11/04/nano-fibers-fill-light-bulbs-with-sunlight/

29 days ago on Solar cell coating could break efficiency barrier, researchers claim