It hardly uses any power, it's always on, and has zero glare while being able to display just about anything on it. It's called the popSLATE, and it looks f**kn' awesome.
With this slim iPhone 5 case's built-in black/white backscreen, users can take pictures, grab one from the web, screenshots, hook up with other photo-sharing programs, share photos with friends and more, all with the secondary screen and application. The app is simple, and very straightforward.
I know, the fact that it's always on might irk you. But the developers claim that its power appetite is super-low, and will always be able to transmit information. Sports scores, a picture of your girlfriend, a message for people looking at you while you're on the phone, and more.
They are taking pre-orders now, over at popSLATE for $129 USD, with a choice of black or white, depending on which color phone you have.