That should be possible. Turn the e-ink black and you can use the transparent OLED as a normal screen, turn the transparent OLED off and you can see the e-ink screen. It should even work for arbitrary sub-regions.
Sony's just released a 15.5-inch addition to its VAIO S Series that not only adds a crucial bit of extra display acreage, but also bumps things up to a full 1080p.
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Would something like this work laid over a e-ink display to give you a best of both worlds tablet?
That should be possible. Turn the e-ink black and you can use the transparent OLED as a normal screen, turn the transparent OLED off and you can see the e-ink screen. It should even work for arbitrary sub-regions.