# US 12,111,466 B2 · Display system and light control film therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,111,466 B2 - Document ID: US12111466B2 - Status: Granted - Kind: B2 - Application number: 17/977,325 - Filed: 2022-10-31 - Published: 2023-10-05 - Granted: 2024-10-08 - Earliest claimed: 2022-03-29 - Assignees: Envisics Ltd - Applicants: Envisics Ltd - Inventors: Timothy Smeeton; Yiren Xia; Celedonia Krawczyk - Web page: https://patentgrep.com/patent/US12111466B2 ## CPC - G02B 27/0103: {comprising holographic elements} - G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces} - G02B 2027/0118: {comprising devices for improving the contrast of the display / brillance control visibility} - G02B 2027/0123: {comprising devices increasing the field of view} - G02B 2207/123: Optical louvre elements, e.g. for directional light blocking - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A head-up display for a vehicle comprises an optical component having a reflective surface arranged, during head-up display operation, in a configuration that is conducive to sunlight glare. A light control layer is disposed on the optical component to receive sunlight on an optical path to the reflective surface. The light control layer comprises a sunlight-receiving surface and a core material separating an array of louvres. The sunlight-receiving surface of the light control layer is serrated in coordination with the array of louvres so as to deflect received sunlight away from the eye-box of the head-up display. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The head-up display as claimed in claim 1, wherein a periodicity of the serration of the sunlight-receiving surface is substantially equal to a periodicity of the array of louvres. ### Claim 3 (depends on 2) The head-up display as claimed in claim 2, wherein the array of louvres is a two-dimensional array having a first and second dimension, and the serration is one-dimensional and extends in the first dimension. ### Claim 4 (depends on 1) The head-up display as claimed in claim 1, wherein the louvres are tilted relative to a plane of the light control layer. ### Claim 5 (depends on 1) The head-up display as claimed in claim 1, wherein the louvres are configured to absorb sunlight. ### Claim 6 (depends on 1) The head-up display as claimed in claim 1, wherein the optical waveguide pupil expander is substantially planar. ### Claim 7 (depends on 6) The head-up display as claimed in claim 6, wherein the optical waveguide pupil expander is arranged during head-up display operation in a substantially flat configuration relative to ground. ### Claim 8 (depends on 1) The head-up display as claimed in claim 1, wherein the core material is substantially transmissive to image light of the head-up display. ### Claim 9 (depends on 1) The head-up display as claimed in claim 1, wherein the sunlight-receiving surface is a coating layer that covers the core material and array of louvres. ### Claim 10 (depends on 9) The head-up display as claimed in claim 9, wherein the coating layer is substantially transparent to image light of the head-up display. ### Claim 11 (depends on 9) The head-up display as claimed in claim 9, wherein the coating layer is a cladding layer. ### Claim 12 (depends on 1) The head-up display as claimed in claim 1, wherein the sunlight-receiving surface further comprises an anti-reflection coating. ### Claim 13 (depends on 1) The head-up display as claimed in claim 1, wherein the louvres of the array of louvres are substantially parallel. ### Claim 14 (depends on 1) The head-up display as claimed in claim 1, wherein each louvre of the array of louvres has substantially the same geometry. ### Claim 15 (depends on 1) The head-up display as claimed in claim 1, wherein each louvre of the array of louvres is substantially rectangular or trapezoid in cross-section. ### Claim 16 (depends on 1) The head-up display as claimed in claim 1, further comprising a windshield of a vehicle, configured such that the replicas of the spatially-modulated light are reflected by the windshield to the eye-box. ### Claim 17 (depends on 1) The head-up display as claimed in claim 1, wherein a periodicity of the array of louvres is a uniform periodicity.