The core components of almost every e-reader remain the same, though: they use E Ink displays – much more relaxing than a phone or tablet screen, which pelt your eyes with light, and they can last for up to weeks between charges. The Libra Colour is Kobo’s larger colour-screen e-reader, with a 7in display and an E Ink Kaleido 3 panel. This is what some Kindle fans have wanted for years: an e-reader with a colour screen.