US Patent 10120550 Portable electronic device and method of controlling same

A shutter and shutter operator are displayed adjacent to a boundary of an information display region on a display of a portable electronic device. The information display region displays first information. In a first state, the shutter operator indicates a first direction of movement of the shutter away from the boundary for the display of second information. In response to an input, the second information is displayed, and the shutter operator changes to indicate another direction of movement of the shutter towards the boundary for hiding the second information.