I think most people don't understand what it means that this is a design patent - it's not the same thing as a "regular" patent (a utility patent). Design patents allow a company to get an exclusive right to the form of a functional object so that a 3rd party can't make a different device with identical appearance (well, not legally at least). Almost every company that puts the time into making a distinctive shape for their devices gets one: Microsoft has one for the Xbox, George Lucas got one for Yoda etc.
Design patents are extremely narrow - you have to do your level best to copy them exactly in order to be found in infringement. Plus, they specifically cannot cover functionality - that has to be covered by a utility patent, if it's going to be protected. This design patent only protects a "portable display device" (that's the wording in the Patent itself), and only one with those specific design elements that are shown in the Patent Figures.