Electronic device with screen-cleaning function

An electronic device comprising:

• a flexible display screen;
• a processor;
• and
• a film attached to the flexible display screen and comprising a front substrate and a back substrate opposite to the front substrate;
• the front substrate facing the flexible display screen, comprising a plurality of heat-sensitive projections, and a plurality of light detection units, each light detection unit detecting a brightness value of light under the flexible display screen and transmitting the detected brightness value to the processor;
• the back substrate being away from the flexible display screen, comprising a heating circuit;
• the heating circuit comprising a plurality of electrical resistance heater elements;
• wherein the processor receives the detected brightness value and determines whether the detected brightness value equals a predefined brightness value;
• when the detected brightness value does not equal the predefined brightness value, an external contaminant is thus determined to exist and be located on the flexible display screen, the processor further controls at least one electrical resistance heater element to generate heat, causing one of the plurality of projections to bulge out from the front substrate, the bulging projection pushes out the flexible display screen, thus making the external contaminant fall from the flexible display screen.