US Patent 10911090 Portable terminal, and control method

There is provided a portable terminal that combines a function of physically protecting the screen, a function of protecting privacy of display on the screen, and a function of making the screen viewable when required. A screen drawing process unit decreases viewability of at least a portion of the screen if it is determined that a flip cover having a window region that faces a touch panel and that is translucent or transparent is superposed on a display surface of a smartphone.