A screen protector is an additional sheet of material—commonly polyurethane or glass—that can be attached to a screen of an electronic device and protect it against physical damage.
The first screen protector was designed and patented by Herbert Schlegel in 1968 for use on television screens.
Screen protectors first entered the mobile-device market after the rise of personal digital assistant (PDA) since PDAs were often operated via a stylus. The tip of the stylus could scratch the sensitive LCD screen surface, screen protectors provided sacrificial protection from this damage. Since then the ubiquity of mobile smartphones has seen the screen protector become widespread.
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