According to the filing, when the device is activated or placed into an operational state where it is appropriate, control elements (e.g., soft keys and menus) are displayed on the display element. The soft keys may be opaque or transparent (so as not to occlude prior displayed information such as a video presentation, a picture, a graphic or textual information). The displayed cursor would identify where on the back-side touch-surface the user has their finger.
"More specifically, a force-sensitive touch-surface is provided on a first or back-side surface of the device through which a user provides input (e.g., cursor manipulation and control element selection/activation)," the company wrote. "On a second or front-side surface, a display element is used to present one or more control elements and a cursor that is controlled through manipulation of the back-side touch-surface.
"When the cursor is positioned over the desired control element/soft key (i.e., spatially overlapping on the display element), the user selects or activates the control element by applying pressure to the force-sensitive touch-surface with their finger," Apple explained. "Accordingly, the invention provides a means to operate a hand-held electronic device with one hand, wherein cursor movement and control element selection/activation may be accomplished without lifting one's finger. "