Head-Up-Displays based on polymethylmethacrylate with phenanthrenequinone

We present the experimental realization of a Head-Up-Display (HUD) based on a photopolymer. Stable volume holograms written in photopolymer layers can serve as mirrors, mode selectors, deflectors, filters and finally have a wide application in automobile head-up displays as holographic screens [1, 2]. The aim of our work is to develop a new HUD screen with a holographic grating in photopolymer based on Plexiglas (polymethylmethacrylate, PMMA) and photosensitive phenanthrenequinone (PQ) molecules for vehicle windshields. The holographic grating is located between the glass plates of windshields and has to be stable up to temperatures of 140°C defined by the manufacturing process of the windshields. To increase the thermal stability of the material and to ensure a good adhesion of the glass plates, the PMMA is modified by a radical copolymerization of methylmethacrylate (MMA) and acryl acid (AA). It gives us the possibility to make the grating thermostable up to 200°C [1]. The layer's thickness is 90±10 µm, the PQ concentration is 3–4 mol.%.