[ProDigit]

Hey Guys,
My e-ink device has arrived today, a 503 type, and at low light settings, the shadows are clearly visible. Even at higher light settings.
It doesn't bother me though...
What bothers me more, is starting from setting 4, I can clearly see a decoloration on the color of the light.
The brighter I set the light, the clearer it becomes.
The top 10% of the screen is like a broken white.
From 10% (like about 1 in) down to 2/3rd of the screen, the color is clearly pink-ish.
Going down below that, the screen becomes broken white again.

Now there's also a quadrant of the screen having a slightly 'brownish' color; on the right-bottom of the screen; starting from light intensity 7 it is noticeable, and the brighter you set the light, the more it is noticeable.
The brownish color originates at the right bottom, and looks like the shadow of between the 2 right bottom leds.
It goes up, all the way 1/3rd of the screen, where it mingles with the pink color, and becomes indestinguishable.

Also, only viewable at high light settings, the light between the 2 center leds, is noticeably much brighter. right next to the brown streak, there's a white streak, originating from the bottom, all the way 1/3rd of the screen up to where it becomes one with the brown and pink.

For me, the decoloration is much more an issue, than the shadows on the bottom, and very noticeable from 14 and up.

I have a theory though, as to what it could be.
Looking at the leds, they all look the same white to me; so I presume Amazon did quite the job in at least finding 4 matching leds.
Even the wave guide screen for the light is very neutral and does not have any color deviations in it.

I presume, and can be nearly 80% sure, that the problem is more of a quantum problem, meaning, when photon waves of multiple light sources interact, some of them will cancel each other out; kind of like when you have a pool of perfect still water, and throw 2 stones in it, from a distance from each other, the waves these stones create, will travel and cross each other's path.
Though both waves created from the stones are quite regular, at the point where both waves interact with each other, you'll see that some waves will cancel each other out; while others will create even greater waves than the source waves (basically adding up on each other).

There's a theory I read a long time ago about light waves, and how multiple light waves can actually interact with each other, and cancel out each other.
And if that is the case, color deviations may become noticeable.
In a sense a prism does about the same thing. It brings out a spreaded pattern of colors out of what ordinarily would be a white light.
In the kindle, the light bouncing back and forth in the glass substrate, must nullify some of the blue colors. Perhaps the issue can be solved by making a different glass substrate (of different thickness); or perhaps a different substrate will only cause different colors to appear.

The way I see it, there's nothing wrong with the kindle like this. It's just a bad engineered glass substrate, or an issue that perhaps just is not solveable (as when any change to the substrate could just move the hue deviations instead of eliminating it.

Anyway, I'm pretty sure that's the problem with those color deviations.
Not much you can do about it.
In any case, don't think that when you see them, that they given you a device from batch with a bad led in it or so, that's just not the case.