A mobile terminal and method of controlling a display device are provided. The present invention includes a display unit displaying information and a control unit controlling the display of the information according to whether luminescence conversion is performed, the luminescence conversion converting a plane luminescence of the display unit to a plurality of dot luminescences. A user can be provided with a substantially analog type information display as well as a digital type information display by loading the luminescence converting unit, such as a plate having a plurality of holes and a semitransparent film, on a display unit of a mobile terminal or by displaying an image having a configuration of the plate.