Quote:
Originally Posted by j.p.s
Looks like Amazon and B&N each need to go to 6 LEDs on the next iteration.
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Not sure it's that simple. I was surprised how even the Nook was, but right below the bright glow from the LEDs was a dim patch before it evened out. With the Kindle, the darker patches correspond with where the LEDs are, not where they aren't. Some of the images of the Kindle screen show what I would describe as "ripples" as well, which is a pretty bizarre effect.
If I had to guess, there are some interference effects in play. These are a lot harder to figure out. One thing that I might try is LEDs on two opposite edges in the hope that it might even stuff out. But if there are interference effects, it might make things worse.
Edge-lit TVs have similar uniformity drawbacks to these edge-lit e-Ink displays because they use similar tech in the backlight. The upside is that the work on one can help the other to improve the light guides (Amazon, B&N and Kobo were all probably waiting on some of that work).