Reflection Suppression Device

Abstract

There is provided a head-up display for a vehicle. The head-up display comprises a substantially planar waveguide having a reflective surface arranged, during head-up display operation, in a configuration that is conducive to sunlight glare. The head-up display further comprises a reflection suppression device. The reflection suppression device comprises a first layer comprising a first serrated surface arranged to receive a holographic wavefront from the waveguide and provide a first turn of the holographic wavefront having at least a component on a first plane containing a surface normal of the waveguide, wherein the first layer is formed of transparent material. The reflection suppression device further comprises an intermediate layer arranged to receive the holographic wavefront from the first layer, wherein the intermediate layer comprises a plurality of louvres in an array, each louvre comprising a light absorbing material. The reflection suppression device further comprises a second layer arranged to receive the holographic wavefront from the intermediate layer. The second layer comprises a second serrated surface arranged to provide a second turn of the holographic wavefront having at least a component on the first plane. The component of the second turn on the first plane is equal and opposite to the component of the first turn on the first plane.

Dependencies are inferred from the claim text.