| CPC G02B 27/0103 (2013.01) [G02B 6/0036 (2013.01); G02B 2027/0118 (2013.01); G02B 2027/0123 (2013.01); G02B 2207/123 (2013.01)] | 17 Claims |
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1. A head-up display for a vehicle, the head-up display being configured to display images to a viewer having an eye in an eye-box, wherein the head-up display comprises:
a source of spatially-modulated light;
an optical waveguide pupil expander having a partially-reflective surface and an opposing reflective surface, the optical waveguide pupil expander being configured to receive spatially-modulated light from the source of spatially-modulated light, guide the spatially-modulated light by reflection between the partially-reflective surface and the opposing reflective surface, and emit a plurality of replicas of the spatially-modulated light from a plurality of emission positions at a first portion of the partially-reflective surface, the optical waveguide pupil expander being arranged, during head-up display operation, in a configuration that is conducive to sunlight glare at one of the surfaces thereof; and
a light control layer disposed on the optical waveguide pupil expander to receive sunlight on an optical path to the reflective surface, wherein the light control layer comprises a sunlight-receiving surface and a core material separating an array of louvres,
wherein the sunlight-receiving surface of the light control layer is serrated in coordination with the array of louvres; and
wherein the array of louvres is configured to transmit spatially-modulated light of the replicas from the first portion of the partially-reflective surface of the optical waveguide pupil expander toward the eye-box, and wherein the serration provides an array of angled surfaces having an angle of orientation configured to direct sunlight received at the sunlight-receiving surface of the light control layer away from the eye-box via specular reflection.
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