# US 2025/0164797 A1 · Illumination system including zonal illumination optical concentrators > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0164797 A1 - Document ID: US20250164797A1 - Status: Published application - Kind: A1 - Application number: 18/937,002 - Filed: 2024-11-04 - Published: 2025-05-22 - Earliest claimed: 2023-11-20 - Assignees: Meta Platforms Technologies, LLC - Applicants: Meta Platforms Technologies, LLC - Inventors: Robert UPTON; Jacques GOLLIER; Fenglin PENG - Web page: https://patentgrep.com/patent/US20250164797A1 ## CPC - G02B 27/0172: {characterised by optical features} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An illumination system for a non-emissive display panel is provided. The illumination system includes a light source array including a plurality of individually addressable illumination units, an illumination unit being configured to emit a first light beam having a first solid angle. The illumination system also includes a concentrator array coupled with the light source array and including a plurality of concentrators, a concentrator being configured to condition the first light beam into a second light beam associated with a second solid angle that is smaller than the first solid angle, the second light beam providing a substantially uniform illumination at an exit aperture of the concentrator. The illumination system also includes an imaging assembly including one or more optical elements configured to image the substantially uniform illumination at the exit aperture of the concentrator onto the non-emissive display panel. ## Claims ### Claim 1 An illumination system for a non-emissive display panel, comprising: a light source array including a plurality of individually addressable illumination units, an illumination unit being configured to emit a first light beam having a first solid angle; a concentrator array coupled with the light source array and including a plurality of concentrators, a concentrator being configured to condition the first light beam into a second light beam associated with a second solid angle that is smaller than the first solid angle, the second light beam providing a substantially uniform illumination at an exit aperture of the concentrator; and an imaging assembly including one or more optical elements configured to image the substantially uniform illumination at the exit aperture of the concentrator onto the non-emissive display panel. ### Claim 2 (depends on 1) The illumination system of claim 1, wherein the concentrator includes an input facet at a location where an entrance aperture of the concentrator is located, an output facet at a location where the exit aperture of the concentrator is located, and a concentrator body disposed between the input facet and the output facet, and wherein an area of the input facet is smaller than an area of the output facet. ### Claim 3 (depends on 2) The illumination system of claim 2, wherein the concentrator body includes at least one of a curved body portion or an angularly shaped body portion. ### Claim 4 (depends on 3) The illumination system of claim 3, wherein the concentrator body further includes a straight body portion. ### Claim 5 (depends on 2) The illumination system of claim 2, wherein an anti-reflection coating is disposed at each of the input facet and the exit facet of the concentrator. ### Claim 6 (depends on 1) The illumination system of claim 1, wherein the concentrator includes a concentrator body having a cavity surrounded by a wall, and wherein the concentrator is configured to guide the first light beam to propagate therethrough via reflection at the wall surrounding the cavity. ### Claim 7 (depends on 1) The illumination system of claim 1, wherein the concentrator includes a solid concentrator body configured to guide the first light beam to propagate therethrough via total internal reflection at a side surface of the solid concentrator body, and wherein the solid concentrator body is made of an isotropic and homogeneous dielectric material having an isotropic and homogenous refractive index. ### Claim 8 (depends on 1) The illumination system of claim 1, wherein the concentrator includes a compound parabolic concentrator (“CPC”). ### Claim 9 (depends on 8) The illumination system of claim 8, wherein the CPC includes an input facet where an entrance aperture of the CPC is located, an output facet where the exit aperture of the CPC is located, and a concentrator body disposed between the input facet and the output facet; and the concentrator body has a truncated paraboloid shape. ### Claim 10 (depends on 9) The illumination system of claim 9, wherein the first light beam is configured to enter the CPC through the entrance aperture, undergo a single reflection at the concentrator body, and exit the CPC through the exit aperture. ### Claim 11 (depends on 1) The illumination system of claim 1, wherein the concentrator includes a taper. ### Claim 12 (depends on 11) The illumination system of claim 11, wherein the taper includes an input facet where an entrance aperture of the taper is located, an output facet where the exit aperture of the taper is located, and a concentrator body disposed between the input facet and the output facet; and the concentrator body has a truncated cone shape or truncated pyramid shape. ### Claim 13 (depends on 12) The illumination system of claim 12, wherein the first light beam is configured to enter the taper through the entrance aperture, undergo multiple reflections at a side surface of the concentrator body, and exit the taper through the exit aperture. ### Claim 14 (depends on 11) The illumination system of claim 11, wherein the taper is configured with a height that is about 5 to 7 times of a width of the exit aperture. ### Claim 15 (depends on 1) The illumination system of claim 1, wherein the concentrator includes one or more of cyclic olefin copolymer, cyclic olefin polymer, polycarbonate, polymethyl methacrylate, polyethylene, polyurethane, or polypropylene. ### Claim 16 (depends on 1) The illumination system of claim 1, wherein the illumination unit is disposed adjacent to an entrance aperture of the concentrator. ### Claim 17 (depends on 1) The illumination system of claim 1, wherein the illumination unit includes at least one red light source, at least one green light source, and at least one blue light source. ### Claim 18 (depends on 1) The illumination system of claim 1, wherein the plurality of concentrators correspond to the plurality of individually addressable illumination units, respectively.