My test taxes the computer more than a normal user and involves keeping Wi-Fi on, cranking the screen to full brightness, turning off all power-saving features, keeping email retrieval going in the background and playing an endless loop of music.

WSJ: A Laptop Screen That Promises an Eyeful

"It's normal television technology - chroma key, " he said referring to the green-screen backgrounds used to superimpose people against separately filmed scenes.

BBC: Biometrics cybersecurity research gets government cash

The e-paper slate is quite a lot bigger than most tablets, let alone e-readers, sporting a 13.3-inch screen (1, 200 x 1, 600) to match the standard A4 size of normal, boring paper.

ENGADGET