Amazon has been granted a patent filed back in March 2006, that brings an ability to have an "e-ink display and an LCD display on the same e-reader". The new patent rights to original Kindle, which featured two parts – one area for the text, and the other for a scrollable wheel. The patent app reads:
"A handheld electronic book reader device is equipped with dual displays. The device includes a first display for presenting visible representations of textual or graphic content related to the electronic book. The device also includes a second display positioned alongside the first display. The second display includes a plurality of graphic elements that correspond to portions of the first display. Also, the second display is responsive to user input to one of the graphic elements to perform an action on the content that is shown in the portion of the first display that corresponds to the one element."
Barnes & Noble's Nook, also features an e-ink display, and a smaller LCD which could be a violation of the patent.