Originally Posted by KingSausage

Amazon had now added language to the product description to justify the blue haze. If this is intentional why of some units have no blue tinge?


"We want you to know...

The
Kindle Fire HDX 7" has perfect color accuracy (100% sRGB), and we
wanted to share more details around our display design decisions that
helped us achieve this.

You may notice a very narrow, faint blue
tint around the edge of the device when looking at items with a white
background, such as books or web pages. All displays have some level of
light emission around the edges, and the light on the Kindle Fire HDX 7"
is blue due to the technology used to render perfect color accuracy.
Most LCD displays use white LEDs, and then apply filters to extract the
desired color. The result is oftentimes a compromise to tone and color
accuracy, or—if attempting to address these compromises—an increase in
battery consumption and, thus, device weight.

We've taken a
different approach. To achieve the perfect color accuracy on Kindle Fire
HDX 7" at the lowest possible battery consumption and device weight, we
used blue, not white, LEDs. Blue LEDs allow for a much more accurate
and rich representation of color and result in an up to 20% improvement
in power efficiency."