Display system and light control film therefor

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.