# Lightening e-Ink

Amazon released Kindle Paperwhite last week. I am very interested in this new device as it is equipped with build-in light.

This light is vector light, which has direction.

<img src="http://i1-news.softpedia-static.com/images/news2/Amazon-Intros-5th-Generation-Kindle-E-Book-4.png" width="435" height="587" class="alignnone size-medium" />

From the picture, we can see the light is toward to display layer, not readers. So the light we see is the reflected light, not source light.

For a general LED/LCD screen, the light is behind the display layer. So when a reader look at the display on the screen, what he really see is the light generated from LCD/LED, than being transparent by display layer. In other word, the reader is looking at a light directly, which is very harmful for eyes.

Kindle Paperwhite is obviously much more healthier than LCD/LED screen. And it is also better than competitor - NOOK GlowLight. On the NOOK, we can see LED lights are in the frames.

Compare the three lighting methods on the market, I think Amazon Kindle is no doubt the best.