# US 12,001,025 B1 · Optical lens assembly for near-eye display and near-eye display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,001,025 B1 - Document ID: US12001025B1 - Status: Granted - Kind: B1 - Application number: 18/336,014 - Filed: 2023-06-15 - Granted: 2024-06-04 - Earliest claimed: 2023-06-15 - Assignees: Tencent America LLC - Applicants: Tencent America LLC - Inventors: Youngshik Yoon; Yi Zhang; Hongdong Li; John D. Le; Kun Gao; Hao Zheng; Jianru Shi - Web page: https://patentgrep.com/patent/US12001025B1 ## CPC - G02B 27/0172: {characterised by optical features} - G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)} - G02B 27/0955: {Lenses (lenses per se G02B3/00)} - G02B 27/283: {used for beam splitting or combining} - G02B 27/4211: {correcting chromatic aberrations (G02B27/0056, G02B27/4222, G02B27/4227 take precedence)} - G02B 2027/015: {involving arrangement aiming to get less bulky devices} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An optical lens assembly for a near-eye display device includes a light box and a diffractive optical element (DOE). The light box has a first layer facing a display screen of the near-eye display device and a second layer facing the DOE. The light box is configured to receive a first light from a display screen of the near-eye display device and transmit at least a portion of the first light to the DOE through a folded optical path, where the first layer and the second layer are flat. The DOE aligned with an optical axis of an eye and is configured to receive a second light from the light box and converge the second light to the eye. ## Claims ### Claim 1 An optical lens assembly for a near-eye display device, comprising: a light box having a first layer facing a display screen of the near-eye display device and a second layer facing a diffractive optical element (DOE), the light box being configured to receive a first light from a display screen of the near-eye display device and transmit at least a portion of the first light to the DOE through a folded optical path, wherein the first layer and the second layer are flat; and the DOE aligned with an optical axis of an eye and configured to receive a second light from the light box and converge the second light to the eye, wherein the second layer of the light box comprises a first reflective polarizer, a second reflective polarizer, and a half-wave retarder placed in between the first reflective polarizer and the second reflective polarizer; and a polarization selectivity of the first reflective polarizer being orthogonal to a polarization selectivity of the second reflective polarizer. ### Claim 2 (depends on 1) The optical lens assembly according to claim 1, wherein a surface of the DOE facing the light box is curved. ### Claim 3 (depends on 1) The optical lens assembly according to claim 1, wherein: the first layer of the light box comprises a beam splitter facing the display screen and a first retarder facing the second layer. ### Claim 4 (depends on 3) The optical lens assembly according to claim 3, wherein the beam splitter is a 50/50 beam splitter. ### Claim 5 (depends on 3) The optical lens assembly according to claim 3, wherein the first retarder is a quarter-wave retarder. ### Claim 6 (depends on 5) The optical lens assembly according to claim 5, wherein: the beam splitter is configured to receive the first light having a circular polarization of a first direction, the first retarder is configured change a portion of the first light that passed through the beam splitter to a third light having a first linear polarization; the second layer is configured to reflect the third light having the first linear polarization back to the first retarder; and the first retarder is further configured to change the third light having the first linear polarization to a fourth light having the circular polarization of the first direction; the beam splitter is further configured to reflect a portion of the fourth light to the first retarder, the reflected light having a circular polarization of a second direction; the first retarder is further configured to change the reflected light to a fifth light having a second linear polarization, wherein the first linear polarization is orthogonal to the second linear polarization; and the second layer is further configured to transmit at least a portion of the fifth light to the DOE as the second light having the second linear polarization. ### Claim 7 (depends on 1) The optical lens assembly according to claim 1, wherein the DOE comprises at least one of an injection molded DOE, a hologram film, or a Fresnel lens surface. ### Claim 8 (depends on 1) The optical lens assembly according to claim 1, wherein the DOE does not fold the optical path of the second light. ### Claim 9 A near-eye display device, comprising: a display screen configured to emit a first light to an optical lens assembly; and the optical lens assembly, comprising: a light box having a first layer facing a display screen of the near-eye display device and a second layer facing a diffractive optical element (DOE), the light box being configured to receive a first light from a display screen of the near-eye display device and transmit at least a portion of the first light to the DOE through a folded optical path, wherein the first layer and the second layer are flat; and the DOE aligned with an optical axis of an eye and configured to receive a second light from the light box and converge the second light to the eye, wherein the second layer of the light box comprises a first reflective polarizer, a second reflective polarizer, and a half-wave retarder placed in between the first reflective polarizer and the second reflective polarizer; and a polarization selectivity of the first reflective polarizer being orthogonal to a polarization selectivity of the second reflective polarizer. ### Claim 10 (depends on 9) The near-eye display device according to claim 9, wherein a surface of the DOE facing the light box is curved. ### Claim 11 (depends on 9) The near-eye display device according to claim 9, wherein: the first layer of the light box comprises a beam splitter facing the display screen and a first retarder facing the second layer. ### Claim 12 (depends on 11) The near-eye display device according to claim 11, wherein the beam splitter is a 50/50 beam splitter. ### Claim 13 (depends on 11) The near-eye display device according to claim 11, wherein the first retarder is a quarter-wave retarder. ### Claim 14 (depends on 13) The near-eye display device according to claim 13, wherein: the display screen is configured to emit the first light having a circular polarization of a first direction; the first retarder is configured change a portion of the first light that passed through the beam splitter to a third light having a first linear polarization; the second layer is configured to reflect the third light having the first linear polarization back to the first retarder; and the first retarder is further configured to change the third light having the first linear polarization to a fourth light having the circular polarization of the first direction; the beam splitter is further configured to reflect a portion of the fourth light to the first retarder, the reflected light having a circular polarization of a second direction; the first retarder is further configured to change the reflected light to a fifth light having a second linear polarization, wherein the first linear polarization is orthogonal to the second linear polarization; and the second layer is further configured to transmit at least a portion of the fifth light to the DOE as the second light having the second linear polarization. ### Claim 15 (depends on 9) The near-eye display device according to claim 9, wherein the DOE comprises at least one of an injection molded DOE, a hologram film, or a Fresnel lens surface. ### Claim 16 (depends on 9) The near-eye display device according to claim 9, wherein the DOE does not fold the optical path of the second light.