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Answering the original questions:
No ePaper display is ever likely to have a "backlight" as by the very definition, these displays are designed to be opaque. They could have an illuminated display though (like pre-digital watches had). But for now, just use a little usb led book light.
The Irex DR1000 series ready are the first ever to fully and correctly display almost any PDF without modification. I say "almost" because I have noticed some slight distortion of musical notation when I display unmodified sheet music, but this it totally resolved by running the PDF through PDFCropper.
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