# US 2025/0085605 A1 · Apparatuses and systems for pancharatnam-berry phase augmented gradient-index liquid crystal lenses > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0085605 A1 - Document ID: US20250085605A1 - Status: Published application - Kind: A1 - Application number: 18/828,459 - Filed: 2024-09-09 - Published: 2025-03-13 - Earliest claimed: 2023-09-13 - Assignees: Meta Platforms Technologies, LLC - Applicants: Meta Platforms Technologies, LLC - Inventors: Eugene Cho; Afsoon Jamali - Web page: https://patentgrep.com/patent/US20250085605A1 ## CPC - G02F 1/294: {Variable focal length devices} - G02F 1/29: for the control of the position or the direction of light beams, i.e. deflection - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract The disclosed apparatus may include a varifocal lens, where the transmissivity of the varifocal lens changes in relation to the optical power of the varifocal lens; and a transmissivity compensation component that is configured to change as the optical power of the varifocal lens changes, such that a variation of transmissivity of the varifocal lens is less than a variation of transmissivity of the varifocal lens in combination with the transmissivity compensation component. Various other apparatuses, systems, and methods are also disclosed. ## Claims ### Claim 1 An apparatus comprising: a varifocal lens, wherein the transmissivity of the varifocal lens changes in relation to the optical power of the varifocal lens; and a transmissivity compensation component that is configured to change as the optical power of the varifocal lens changes, such that a variation of transmissivity of the varifocal lens is less than a variation of transmissivity of the varifocal lens in combination with the transmissivity compensation component. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein: the varifocal lens is planar; and the transmissivity compensation component is planar. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the varifocal lens comprises a gradient-index liquid crystal lens. ### Claim 4 (depends on 3) The apparatus of claim 3, wherein the transmissivity compensation component comprises a Pancharatnam-Berry phase element. ### Claim 5 (depends on 1) The apparatus of claim 1, further comprising control circuitry that transmits a signal to the transmissivity compensation component that regulates a transmissivity of the transmissivity compensation component. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein the control circuitry generates the signal based at least in part on at least one of: a signal received by the control circuitry to change an optical power of the varifocal lens; a signal received by the control circuitry indicating a change to the optical power of the varifocal lens; or a signal received by the control circuitry indicating a change to a transmissivity of the varifocal lens. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein a change in the transmissivity of the varifocal lens in relation to the optical power of the varifocal lens is non-uniform across the varifocal lens. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein the transmissivity compensation component is configured to change as the optical power of the varifocal lens changes such that a non-uniformity of transmissivity of the varifocal lens is less than a non-uniformity of transmissivity of the varifocal lens in combination with the transmissivity compensation component. ### Claim 9 (depends on 7) The apparatus of claim 7, wherein a change in the transmissivity of the varifocal lens in relation to the optical power of the varifocal lens varies radially across the varifocal lens. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the transmissivity compensation component is configured to change with a radial distribution across the transmissivity compensation component as the optical power of the varifocal lens changes. ### Claim 11 A system comprising: a lens apparatus, comprising: a varifocal lens, wherein the transmissivity of the varifocal lens changes in relation to the optical power of the varifocal lens; and a transmissivity compensation component that is configured to change as the optical power of the varifocal lens changes, such that a variation of transmissivity of the varifocal lens is less than a variation of transmissivity of the varifocal lens in combination with the transmissivity compensation component; an accommodation module; and a head-mounted display. ### Claim 12 (depends on 11) The system of claim 11, wherein the head-mounted display comprises a virtual image display. ### Claim 13 (depends on 12) The system of claim 12, wherein: the accommodation module is on an eye side of the display; and the varifocal lens and the transmissivity compensation component are on the world side of the display. ### Claim 14 (depends on 11) The system of claim 11, wherein the varifocal lens comprises a gradient-index liquid crystal lens. ### Claim 15 (depends on 11) The system of claim 11, wherein the transmissivity compensation component comprises a Pancharatnam-Berry phase element. ### Claim 16 (depends on 11) The system of claim 11, further comprising control circuitry that transmits a signal to the transmissivity compensation component that regulates a transmissivity of the transmissivity compensation component. ### Claim 17 (depends on 16) The system of claim 16, wherein the control circuitry generates the signal based at least in part on at least one of: a signal received by the control circuitry to change an optical power of the varifocal lens; a signal received by the control circuitry indicating a change to the optical power of the varifocal lens; or a signal received by the control circuitry indicating a change to a transmissivity of the varifocal lens. ### Claim 18 (depends on 11) The system of claim 11, wherein a change in a transmissivity of the varifocal lens in relation to the optical power of the varifocal lens is non-uniform across the varifocal lens. ### Claim 19 (depends on 11) The system of claim 11, wherein the transmissivity compensation component is configured to change as the optical power of the varifocal lens changes such that a non-uniformity of transmissivity of the varifocal lens is less than a non-uniformity of transmissivity of the varifocal lens in combination with the transmissivity compensation component. ### Claim 20 A method of manufacture, comprising: placing a varifocal lens, wherein a transmissivity of the varifocal lens changes in relation to the optical power of the varifocal lens; disposing a transmissivity compensation component in a same optical path as the varifocal lens, wherein the transmissivity compensation component is configured to change as the optical power of the varifocal lens changes, such that a variation of transmissivity of the varifocal lens is less than a variation of transmissivity of the varifocal lens in combination with the transmissivity compensation component; and communicatively coupling control circuitry to the transmissivity compensation component, the control circuitry configured to transmit a signal to the transmissivity compensation component to change transmissivity as the transmissivity of the varifocal lens changes.