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Cars with HUD do have different windscreens. All windscreens are laminated glass (i.e. made up of different layers) and the trick is to get a decent reflection of the HUD projection in a single clear image. So with HUD there is a specially reflective layer in the lamination sandwich to achieve this,
"At the center of the HUD technology is a precisely engineered "interlayer"
of DuPont(TM) Butacite(R) PVB that acts as the screen onto which the HUD
information is projected. This interlayer is called the DuPont(TM) Wedge(TM)
because of its angular cross-section.
"Laminated between two layers of glass, the Wedge(TM) is transparent to
allow distortion-free forward vision, but also is able to reflect the HUD
projection for viewing by the driver. The virtual image appears to float in
the driver's line of sight near the front of the car, minimizing refocus time.
Virtual image location and brightness can be adjusted to the driver's
preference. Together, these features help to reduce driver distraction,
enhancing safety."
Source "Ozzie Osmond"
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