Head-up display, referred to as HUD, refers to an operator-centered, blind-operated, multi-functional instrument panel.

Its function is to project important operating information onto the glass in front of the operator, so that the operator can see all necessary information without looking down or turning his head.

The original design intention of HUD Sight is to put the shooter as the center, making it more convenient for him to operate the firearm when he shoots accurately; blind operation is to prevent the shooter from taking his eyes away from the front as much as possible; the purpose of displaying information on the lense is to divert the operator's attention as little as possible from sightseeing.

In short, the common purpose of these systems is to allow shooters to achieve better design efficiency and a better design experience when shooting.