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CN-121995629-A - Optical module and electronic equipment

CN121995629ACN 121995629 ACN121995629 ACN 121995629ACN-121995629-A

Abstract

The application relates to an optical module and electronic equipment, which comprises a display component, a first prism, a polarization reflecting layer, a second prism and a third prism, wherein the display component comprises a light emitting surface and is used for emitting polarized light, the first prism is arranged on the light emitting surface side of the display component and comprises a first optical surface and a second optical surface, the polarization reflecting layer is arranged on one side of the first prism, which is provided with the first optical surface, the second prism is arranged on one side of the first prism, which is provided with the second optical surface, the second prism comprises a third optical surface, which is arranged on one side, which is far away from the second optical surface, the third prism is arranged on one side, which is far away from the first optical surface, the third prism comprises a fourth optical surface, the fourth optical surface is arranged on one side, which is far away from the first optical surface, the polarized light emitted by the display component can be sequentially reflected by the first optical surface, the second optical surface, the polarization reflecting layer and the third optical surface and then is transmitted into human eyes, the fourth optical surface and the third optical surface are curved surfaces, and the surface types are the same, so that in the propagation process of the polarized light and the third optical surface are matched with the optical module can be improved, and the quality of the optical aberration can be improved. In addition, the surface types of the fourth optical surface and the third optical surface are the same, so that the whole optical module can be formed into a structure with uniform thickness, the whole thickness of the optical module is reduced, the shape of the optical module is more similar to that of an eyeglass lens, and the wearing effect of a user is improved.

Inventors

  • ZHAO XIANYU
  • LU YUNKAI
  • DING WUWEN

Assignees

  • 华为终端有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (19)

  1. 1. An optical module, comprising: A display assembly including a light emitting surface for emitting polarized light; The first prism is arranged on the light emitting surface side of the display component and comprises a first optical surface and a second optical surface; a polarization reflection layer provided on a side of the first prism having the first optical surface; The second prism is arranged on one side, provided with the second optical surface, of the first prism, and comprises a third optical surface, and the third optical surface is arranged on one side, away from the second optical surface; The third prism is arranged on one side of the polarization reflecting layer, which is away from the first optical surface, and comprises a fourth optical surface which is arranged on one side of the polarization reflecting layer, which is away from the first optical surface; Polarized light rays emitted by the display component can sequentially pass through the first optical surface, the second optical surface, the polarized reflection layer and the third optical surface, then are reflected and then enter human eyes through the fourth optical surface, and the fourth optical surface and the third optical surface are curved surfaces and have the same surface type.
  2. 2. The optical module of claim 1, wherein the first prism further comprises a fifth optical surface disposed on a side proximate the display assembly and coupled to the first optical surface and the second optical surface; at least two optical surfaces of the fifth optical surface, the first optical surface, the second optical surface and the third optical surface are free curved surfaces.
  3. 3. The optical module of any one of claims 1 or 2, wherein the first optical surface is a free-form surface.
  4. 4. An optical module according to any one of claims 1 to 3, wherein the angle of incidence of the polarized light beam directed to the first optical surface by the display device is greater than or equal to the critical angle of total reflection.
  5. 5. The optical module according to any one of claims 1 to 4, wherein the first optical surface includes a first reflection area and a first transmission area, and the first reflection area and the first transmission area are sequentially disposed along a direction away from the display component; polarized light can be reflected to the second optical surface through the first reflection area, and can be emitted out of or enter the first prism through the first transmission area; The third prism and the first prism are arranged at least at the position of the first reflection area at intervals.
  6. 6. The optical module of any one of claims 1-5, wherein the polarized light reflected by the first optical surface toward the second optical surface has an incident angle greater than or equal to a critical angle for total reflection.
  7. 7. The optical module according to any one of claims 1 to 6, wherein the second optical surface includes a second reflection area and a second transmission area, and the second reflection area and the second transmission area are sequentially disposed along a direction away from the display component; polarized light can be reflected toward the first optical surface through the second reflection region, and can be emitted out of or into the first prism through the second transmission region; The second prisms are arranged at least at the position of the second reflection area at intervals between the first prisms.
  8. 8. The optical module of claim 7, further comprising a first reflective element attached to the second reflective region; polarized light reflected toward the second optical surface by the first optical surface can be totally reflected by the first reflecting member.
  9. 9. The optical module according to any one of claims 1 to 8, further comprising a first optical film layer, wherein the first optical film layer is attached to the first optical surface; At least part of polarized light rays emitted to the first optical surface through the display component can be reflected to the second optical surface through the first optical film layer.
  10. 10. The optical module of claim 9, wherein the first optical film layer is a total reflection film, a polarizing reflection film, or a light splitting film.
  11. 11. The optical module according to any one of claims 1 to 10, further comprising a second optical film layer, wherein the second optical film layer is attached to the second optical surface; at least a portion of the polarized light reflected toward the second optical surface by the first optical surface is capable of being reflected toward the first optical surface by the second optical film layer.
  12. 12. The optical module of claim 11, wherein the second optical film layer is a total reflection film, a polarizing reflection film, or a light splitting film.
  13. 13. The optical module of claim 11, wherein the second prism covers at least part or all of the second reflective area; at least part of the first reflecting area is covered by the third prism; ambient light can be sequentially emitted into human eyes through the second prism, the first prism and the third prism.
  14. 14. The optical module of any one of claims 1-13, further comprising a phase retardation layer disposed between the first prism and the second prism.
  15. 15. The optical module of claim 14, wherein the phase retardation layer is a quarter wave plate.
  16. 16. The optical module according to any one of claims 1 to 15, wherein the second prism further comprises a sixth optical surface, and the sixth optical surface is disposed on a side close to the second optical surface; The sixth optical surface has the same surface shape as the second optical surface.
  17. 17. The optical module according to any one of claims 1 to 16, wherein the third prism further comprises a seventh optical surface, the seventh optical surface being disposed on a side close to the first optical surface; the seventh optical surface has the same surface shape as the first optical surface.
  18. 18. The optical module according to any one of claims 1 to 17, further comprising a prism group disposed between the first prism and the third prism, the prism group comprising at least one prism; The surface of the prism group, which is close to one side of the third prism, is provided with the polarized reflection layer.
  19. 19. An electronic device comprising a frame and an optical module according to any one of claims 1 to 18, the optical module being mounted to the frame.

Description

Optical module and electronic equipment Technical Field The application relates to the technical field of terminals, in particular to an optical module and electronic equipment. Background With the development of display technology, near-eye display technologies such as augmented reality (augmented reality, AR) have been widely used, and head-mounted display devices have been developed. In the head-mounted display device, an image provided by the display panel is required to be processed by the optical module and then presented to a user. Among them, the technology of the geometrical optical scheme is mature, and is the main optical display scheme of the current head-mounted display device. However, in the geometrical optical scheme in the related art, the overall thickness of the optical module is large, and the imaging quality is poor. Disclosure of Invention In view of the above, the present application provides an optical module and an electronic device, so as to solve the problems of the optical module in the prior art that the overall thickness is large and the imaging quality is poor. The first aspect of the embodiments of the present application provides an optical module, which includes a display component, a first prism, a polarizing reflection layer, a second prism and a third prism, where the display component includes a light emitting surface, the first prism is disposed on the light emitting surface side of the display component, the first prism includes a first optical surface and a second optical surface, the polarizing reflection layer is disposed on the side of the first prism having the first optical surface, the second prism is disposed on the side of the first prism having the second optical surface, the second prism includes a third optical surface, the third optical surface is disposed on the side far from the second optical surface, the third prism is disposed on the side of the polarizing reflection layer far from the first optical surface, the third prism includes a fourth optical surface, the fourth optical surface is disposed on the side far from the first optical surface, the polarizing light emitted by the display component can sequentially pass through the first optical surface, the second optical surface, the third optical surface, the fourth optical surface and the fourth optical surface, and the fourth optical surface are the same. In the application, polarized light rays emitted by the display component through the light emitting surface enter the first prism, and can be reflected by the first optical surface, the second optical surface, the polarized reflecting layer and the third optical surface in sequence and then enter human eyes through the fourth optical surface, so that a virtual image is formed. The fourth optical surface and the third optical surface are matched together in the propagation process of the polarized light, so that the aberration correction capability of the optical module is improved, the aberration of the optical module is reduced, and the imaging quality of the optical module is improved. In addition, the surface types of the fourth optical surface and the third optical surface are the same, so that the whole optical module can be formed into a structure with uniform thickness, the whole thickness of the optical module is reduced, the shape of the optical module is more similar to that of an eyeglass lens, and the wearing effect of a user is improved. In addition, the optical path of the ambient light in the structure sequentially passes through the second prism, the first prism and the third prism to be the same, and the transition between the fourth optical surface and the first optical surface of the curved surface structure can be smoother, so that the ambient light transmitted to human eyes is not easy to distort, the imaging of an external scene is not easy to distort, the visual area range of the external environment can be easily seen by a user through the optical component, and the use experience of the user is improved. In one possible design, the first prism further includes a fifth optical surface disposed on a side near the display component and connected to the first optical surface and the second optical surface, and at least two of the fifth optical surface, the first optical surface, the second optical surface, and the third optical surface are free-form surfaces. The free-form surface has higher design freedom, higher flexibility and adjustability, and can design shape and curvature according to specific optical requirements, thereby achieving specific optical effect, realizing better optical performance and having excellent optical performance. At least two optical surfaces in the fifth optical surface, the first optical surface, the second optical surface and the third optical surface are free curved surfaces, so that at least two free curved surfaces can be matched with each other in the propagation process of polarized light