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What is your perceived benefit from this theoretical display?

It seems like the LCD panel would make the eInk panel less legible there by negating any advantage there. Being a fixed device with constant power, the other advantage of eInk is removed.

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Plus if the e-Ink is backlit, it's no longer as easy on the eyes, eliminating it's biggest feature.

Depends on how much the overlayed LCD screen would impact legibility. I'm not sure. Transparent OLED might work [1]. The backlit would basically be for evenings, where the ambient light might not be enough. I just love the readability and aesthetics of eInk. Practically, it's probably worse at everything...so I can understand the limited uptake.

[1] http://www.mmt.io/transparent-oled-touch-screen-display/

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