Optical lens assembly for near-eye display and near-eye display device

Patent metadata

Field	Value
Publication number	US-12339461-B2
Application number	US-202418619504-A
Country	US
Kind code	B2
Filing date	Mar 28, 2024
Priority date	Jun 15, 2023
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

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.

First claim

What is claimed is:

1. A light box of an optical lens assembly for a near-eye display device, comprising:
a first layer facing a display screen of the near-eye display device; and
a second layer facing an optical element of the optical lens assembly,
wherein 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 optical element through a folded optical path to be converged to an eye;
the first layer and the second layer are flat;
the second layer of the light box comprises a plurality of reflective polarizers, a polarization selectivity of a first reflective polarizer in the reflective polarizers being different from a polarization selectivity of a second reflective polarizer in the reflective polarizers; and
the folded optical path includes a fold between the first layer and the second layer of the light box.

2. The light box according to claim 1 , wherein the second layer of the light box further comprises a retarder placed in between the first reflective polarizer and the second reflective polarizer.

3. The light box according to claim 2 , wherein:
the retarder in the second layer is a half-wave retarder.

4. The light box according to claim 1 , wherein the polarization selectivity of the first reflective polarizer is orthogonal to the polarization selectivity of the second reflective polarizer.

5. The light box 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.

6. The light box according to claim 5 , wherein the beam splitter is a 50/50 beam splitter.

7. The light box according to claim 5 , wherein the first retarder in the first layer is a quarter-wave retarder.

8. The light box according to claim 7 , 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 optical element as the second light having the second linear polarization.

9. 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 an optical element, 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 optical element through a folded optical path, and the first layer and the second layer being flat; and
the optical element 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 plurality of reflective polarizers, a polarization selectivity of a first reflective polarizer in the reflective polarizers being different from a polarization selectivity of a second reflective polarizer in the reflective polarizers; and
the folded optical path includes a fold between the first layer and the second layer of the light box.

10. The optical lens assembly according to claim 9 , wherein the second layer of the light box further comprises a retarder placed in between the first reflective polarizer and the second reflective polarizer.

11. The optical lens assembly according to claim 10 , wherein:
the retarder in the second layer is a half-wave retarder.

12. The optical lens assembly according to claim 9 , wherein the polarization selectivity of the first reflective polarizer is orthogonal to the polarization selectivity of the second reflective polarizer.

13. The optical lens assembly according to claim 9 , wherein a surface of the optical element facing the light box is curved.

14. The optical lens assembly 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.

15. The optical lens assembly according to claim 14 , wherein the beam splitter is a 50/50 beam splitter.

16. The optical lens assembly according to claim 14 , wherein the first retarder is a quarter-wave retarder.

17. The optical lens assembly according to claim 16 , 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 optical element as the second light having the second linear polarization.

18. The optical lens assembly according to claim 9 , wherein the optical element is a diffractive optical element (DOE).

19. The optical lens assembly according to claim 18 , wherein the DOE comprises at least one of an injection molded DOE, a hologram film, or a Fresnel lens surface.

20. The optical lens assembly according to claim 18 , wherein the DOE does not fold the optical path of the second light.

Assignees

• Tencent America LLC

Inventors

• Yoon Youngshik
• Zhang Yi
• Li Hongdong
• Le John D
• Gao Kun
• Zheng Hao
• Shi Jianru

Classifications

• G02B27/0955

  Lenses (lenses per se G02B3/00) · CPC title

• G02B27/283

  used for beam splitting or combining · CPC title

• G02B5/3083

  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) · CPC title

• G02B27/4211

  correcting chromatic aberrations (G02B27/0056, G02B27/4222, G02B27/4227 take precedence) · CPC title

• G02B2027/015

  involving arrangement aiming to get less bulky devices · CPC title