Kindle Paperwhite 3G is one of the most surprising tablets from the market these days. With a weight of only 7.8 ounces, it isn’t only a very light product, but it also measures no more than 6.7 x 4.6-Inch x 0.36, just the same as the Kindle Fire 7 inch and All-New Kindle Fire HD models.
Just as you see in its name, Kindle Paperwhite 3G comes with free 3G wireless , so you don’t have to be looking for Wi-Fi hotspots, annual contracts or monthly fees. You already know that 3G wireless works globally, so you can easily download books anywhere you might need. Ad there is a massive book selection at the lowest prices possible; just imagine over a million titles less than $9.99. The 8-week battery life, even with the light on certainly works in your advantage too, not to mention the high contrast touchscreen with built-in light.
So, Kindle Paperwhite 3G comes with a 6 “Extra-pixel display with built-in light +212 ppi for brightness, sharpness and clarity, as well as 16-level gray scale pixel + 62 % higher to ensure you a high visibility. And there are 3 different layers: Nanoimprinted Light guide (on the top), Touch Screen (in the middle) and Paperwhite Display (on the bottom).
Source:
http://www.blugga.com/2012/09/19/the-surprising-kindle-paperwhite-3g/