Qualcomm's Mirasol screens can handle all of those applications and even display video. Much like E Ink screens, Marisol displays are reflective and require little to no power until the on-screen content needs to change. A little ambient light is also all that's needed to see the screen. These displays are consequently ideal for a task such as reading, when the screen doesn't have to change very often. But the Qualcomm device differs greatly when it comes to other applications, such as video or text messaging, that require frequent changes on screen. In those scenarios, Cathey says, Marisol's displays perform much better than E Ink's because they require less power per screen change. "As the content changes, the user experience changes and so do the requirements," he says.