System and method for detecting imperfections in a screen

A method comprising:

• constructing device that is configured to detect imperfections on a surface of a touchscreen of an electrical device in accordance with a process comprising:
• producing, by the touchscreen, an electric signal indicative of an object's contact with the touchscreen;
• receiving an acoustic signal by an acoustic sensor, during the contact of the object with the touchscreen;
• analyzing, by a processor, at least one of the electric signal and received acoustic signal, wherein the analyzing includes:
• referencing an initial group of labeled touchscreens, comprising at least one touchscreen with at least one known imperfection, and at least one touchscreen without imperfections, wherein:
• at least one feature has been extracted from an electric signal relating to each touchscreen of the initial group of labeled touchscreens;
• each touchscreen of the labeled group of touchscreens has been classified to classes according to said at least one feature;
• each class is associated with touchscreens having or not having imperfections;
• producing an additional electric signal, from an additional unlabeled touchscreen;
• extracting, by a processor, the at least one feature from the additional electric signal of the additional unlabeled touchscreen;
• and
• associating, by a processor, the additional touchscreen with a class of touchscreens having or not having imperfections;
• and
• determining an existence of imperfections on the touchscreen's surface based on the analysis.