Quote:
Originally Posted by Kolenka
It's not hard to lay them out, but it is hard to force light from only 6-10 LEDs to evenly light a square surface.
More ideally, you'd want a large number of lower power LEDs to avoid the shadows. The shadows are there because to get those parts of the screen lit up, you have to bend light more sharply via refraction. The physics of optics shows us that the more you want to bend the light, the more complicated the optics have to be. And to make it worse, the more likely you are to introduce optical aberrations into the layer over the e-ink that cannot be completely removed.
And here, Amazon is trying to take the light from a half-dozen LEDs, refract it down onto the e-Ink display, and then bounce it off the e-ink back out with as little distortion as possible. As someone who knows enough about optics to understand the challenges of this, I'm honestly still somewhat impressed they made it as good as it is. And all you have to do is compare the screens between the PW3 and Voyage to see how much sharper the second-generation layer is in comparison to make higher DPI screens that much nicer (something Amazon doesn't even toot their own horn about).
Optics is one of those things that never really gets any easier. We just figure out even more bizarre techniques to push the boundaries just a bit more.
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Don't they tune each led to output the same amount of light before they lay them on top of the eink display,with every ereader being the same size and with the leds all being positioned in the same spots i still don't understand why this happens.
Unless they don't check the leds until they have been placed inside the final product and then say do a QC on every 1 in 100 or something and realise they need to check the leds again.
Or perhaps the issues arises with the layering of the leds on the eink display,not aligning them properly ect