Why does the Mercedes-Benz HUD display have ghosting?

[RemingtonFitz]

Because the incident light is reflected by both surfaces of the glass. The head-up display superimposes flight information in the driver's field of view by reflecting the projection of a CRT through a piece of glass. The principle of HUD: HUD uses the principle of optical reflection to project important flight-related information onto a piece of glass. This glass is located at the front of the cockpit, roughly at eye level with the pilot, and the projected text and images are adjusted to a distance with infinite focal length. When the pilot looks forward through the HUD, they can easily merge the external scene with the data displayed on the HUD. Introduction to the head-up display: The head-up display refers to a display device that projects the main driving instrument attitude guidance indicator and main flight parameters onto the driver's helmet or windshield. This allows the driver to see the main driving instruments and important flight parameters while looking forward at the external view ahead.