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Originally Posted by JoeC
I saw that. They imply a lot of technical wizardry in the device. It will be interesting to see a side by side comparison with the Kobo (as you posted earlier).
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I'm not sure about that "technical wizardry". I mean gallium nitride LEDs have been around since the early 90s when they were the basis for the first usable blue LEDs. Currently most of your blue and green LEDs are indium or aluminun gallium nitride based while phosphide based LEDs are still the majority of red and infra-red LEDs though gallium nitride based LEDs are making inroad in that area. Perhaps Amazon is using europium:gallium nitride LEDs or a similar technology which allow for color tuning though the best colour tuning still involves 4 LEDs in the same package (white, blue, green & red).
Not to mention some of the phrasing still struck me as being very iffy. "Nitride LEDs to assign pixel level colors"? "we use these coatings to focus the light through individual pixels instead of mixing colors together" and "it's focusing the light through individual pixels of color instead of just a spray that mixes color together".
There was part of the specifications I found on multiple sites that stated the front light used 12 white LEDs, 13 amber LEDs which is more than the Paperwhite (9 white, 10 amber LEDs) and a custom designed lightguide.
Yes, in theory you could use a microLED array to have the LED colour matched for every pixel on the display. The 84.6 µm pixels are well within the sizing of a microLED which can go as low as 7 µm but you would run into the issue that you would have to align that display over each pixel and those microLEDs are opaque so no light would be coming back through the LED itself. This would seem to lead to the need for 2 LEDs per pixel (1 red, green or blue and 1 white) with the color LEDs matching the color of the CFA below it and the white LEDS blasting through the gaps in the CFA. Please note that this array would consume quite a bit more power than a simple light guide with LEDs on the edge(s).
MicroLED technology has been used for flexible & transparent displays but since we are looking at the back of the MicroLED array if Amazon used it, the 45-60% transmission of light would greatly reduce the brightness of the display.
If you look at the Samsung TV in this video, it's easy to see how much light is absorbed by the transparent display.