Abstract: A cell phone includes a body having an opening, a display panel which closes the opening and displays an image, and a backlight unit. The backlight unit is movable between a display position in which it faces the display panel to close the opening and applies illumination light to the display panel and an open position in which the backlight unit is situated off the opening. A projector includes a housing having a loading slot into which the display panel of the portable electronic device is insertable, a light source section, and an optical system which diffuses and outwardly radiates illumination light applied from the light source section. The portable electronic device is to be loaded into the loading slot with the backlight unit moved to the open position, and the display panel is located across an optical axis of the optical system at right angles thereto.