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When the player pulls the trigger, the computer (often assisted by the display circuitry) times how long it takes the electron beam to excite the phosphor at the location at which the gun is pointed.The light gun sends a signal after sensing the sudden small change in brightness of a point on the screen when the electron gun refreshes that spot.In 2007, Nintendo released the Wii Zapper for the Wii, a peripheral which is actually a plastic shell that houses both the Wii Remote and nunchuk for gun-style video games.
Traditional light guns cannot be used on the newer LCD and plasma screens, and have problems with projection screens.
Essentially, the diode tells the computer whether or not the player hit something, and for A side effect of this is that on poorly designed games, often a player can point the gun at a light bulb or other bright light source, pull the trigger, and cause the system to falsely detect a hit on the first target every time.
Better games account for this either by detecting if all targets appear to match or by displaying a black screen and verifying that no targets match.
The first light guns appeared in the 1930s, following the development of light-sensing vacuum tubes.
It was not long before the technology began appearing in arcade shooting games, beginning with the Seeburg Ray-O-Lite in 1936.The screen is drawn by a scanning electron beam that travels across the screen starting at the top until it hits the end, and then moves down to update the next line.