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EP-4336244-B1 - OPTICAL SYSTEM, ILLUMINATION SYSTEM, AND DISPLAY SYSTEM

EP4336244B1EP 4336244 B1EP4336244 B1EP 4336244B1EP-4336244-B1

Inventors

  • WANG, Jinlei
  • LI, Shimao
  • ZHAO, HAN

Dates

Publication Date
20260506
Application Date
20220307

Claims (15)

  1. An optical system, comprising: a light source component, configured to generate a light beam comprising S-polarized light and P-polarized light; characterised by a light adjustment component, configured to adjust a ratio of the S-polarized light and/or a ratio of the P-polarized light in the light beam; a first polarization beamsplitter mirror component, configured to split a light beam adjusted by the light adjustment component into a first light beam and a second light beam, wherein the first light beam is a light beam of the S-polarized light, and the second light beam is a light beam of the P-polarized light; a first lens component, configured to project the first light beam or a modulated first light beam to a first region; and a second lens component, configured to project the second light beam or a modulated second light beam to a second region.
  2. The optical system according to claim 1, wherein the light adjustment component is configured to change a relative phase of the S-polarized light and the P-polarized light in the light beam, to adjust the ratio of the S-polarized light and/or the ratio of the P-polarized light in the light beam.
  3. The optical system according to claim 1 or 2, wherein the light adjustment component comprises at least a birefringent crystal rotatable around a rotation axis, wherein the rotation axis coincides with an optical axis of the light beam.
  4. The optical system according to claim 3, wherein the birefringent crystal is a half-wave plate.
  5. The optical system according to any one of claims 1 to 4, wherein the optical system further comprises a first spatial light modulator and a second spatial light modulator, wherein the first spatial light modulator is configured to modulate the first light beam; the first lens component projects the modulated first light beam to the first region to form a first image; the second spatial light modulator is configured to modulate the second light beam; and the second lens component projects the modulated second light beam to the second region to form a second image.
  6. The optical system according to claim 5, wherein the first region is adjacent to or partially overlaps the second region; and the first image and the second image are spliced to form a projection image.
  7. The optical system according to claim 5, wherein the optical system further comprises a screen, wherein the first region and the second region are located in a same region of the screen; and the first image is a polarized light image for the left eye of a user, and the second image is a polarized light image for the right eye of the user.
  8. The optical system according to claim 7, wherein the optical system further comprises a cylindrical lens component, and a focal plane of the cylindrical lens component coincides with a plane in which the screen is located.
  9. The optical system according to claim 7, wherein the optical system further comprises a slit grating component, wherein a plane in which the slit grating component is located is parallel to a plane in which the screen is located, and there is a preset distance between the slit grating component and the screen, so that the left eye of the user sees the first image through a slit of the slit grating component, and the right eye of the user sees the second image through the slit of the slit grating component.
  10. The optical system according to any one of claims 5 to 9, wherein the first spatial light modulator and the second spatial light modulator are transmissive spatial light modulators; and a reflective element is arranged between the first polarization beamsplitter mirror component and the second spatial light modulator, and is configured to reflect the second light beam to the second spatial light modulator.
  11. The optical system according to any one of claims 5 to 9, wherein the first spatial light modulator and the second spatial light modulator are reflective spatial light modulators; a light polarization direction conversion element and a second polarization beamsplitter mirror component are sequentially arranged between the first polarization beamsplitter mirror component and the second spatial light modulator; the light polarization direction conversion element is configured to convert the second light beam from the P-polarized light to the S-polarized light; and the second polarization beamsplitter mirror component is configured to reflect the S-polarized light to the second spatial light modulator, and transmit the P-polarized light to the second lens component.
  12. The optical system according to any one of claims 5 to 9, wherein the first spatial light modulator and the second spatial light modulator are reflective spatial light modulators; a second polarization beamsplitter mirror component is arranged between the first polarization beamsplitter mirror component and the second spatial light modulator; and the second polarization beamsplitter mirror component is configured to transmit the second light beam to the second spatial light modulator, and reflect the modulated second light beam to the second lens component.
  13. The optical system according to claim 11, wherein the light polarization direction conversion element is a half-wave plate.
  14. The optical system according to any one of claims 1 to 4, wherein the first lens component is an illumination lens component, and is configured to project the first light beam to the first region to illuminate the first region; and/or the second lens component is an illumination lens component, and is configured to project the second light beam to the second region to illuminate the second region.
  15. A vehicle, wherein the vehicle comprises the optical system according to any one of claims 1 to 12 and a windshield, and the windshield is configured to perform reflection imaging on a light beam generated by the optical system.

Description

TECHNICAL FIELD This application relates to the field of optical technologies, and in particular, to an optical system, an illumination system, and a display system. BACKGROUND In conventional technologies, a light source in a multi-lens optical system generates light beams, and a light beam allocated to each lens in a plurality of lenses is fixed and nonadjustable, causing inconvenience in actual application scenarios. For example, in a projection scenario, consistency between intensities of light projected by a plurality of lenses is typically implemented through designing or assembling. This raises challenges to assembly of the multi-lens optical system, and causes inconsistency between intensities of the light projected by the plurality of lenses in the projection scenario due to device loss. Relevant prior art is CN 108 107 665 A. SUMMARY To overcome the foregoing problem, embodiments of this application provide an optical system, an illumination system, a head-up display system, and a display system, to implement dynamic adjustment of a split ratio for a plurality of lenses in a multi-lens optical system. According to a first aspect, this application provides an optical system. The optical system includes at least a light source component, a light adjustment component, a first polarization beamsplitter mirror component, a first lens component, and a second lens component. The light source component is configured to generate a light beam including S-polarized light and P-polarized light. The light adjustment component is configured to adjust a ratio of the S-polarized light and a ratio of the P-polarized light in the light beam. The first polarization beamsplitter mirror component is configured to split a light beam adjusted by the light adjustment component into a first light beam and a second light beam, where the first light beam is a light beam of the S-polarized light, and the second light beam is a light beam of the P-polarized light. The first lens component is configured to project the first light beam or a modulated first light beam to a first region. The second lens component is configured to project the second light beam or a modulated second light beam to a second region. In the optical system provided in this embodiment of this application, a light adjustment component is arranged between a light source component and a lens component, so that split ratios in which a light beam generated by a light source of a multi-lens optical system is allocated to a plurality of lenses are dynamically adjustable. In a possible implementation, the light adjustment component includes at least a birefringent crystal that can change an intensity of the S-polarized light and an intensity of the P-polarized light. The birefringent crystal is rotatable around an axis, such that the intensity of the S-polarized light and the intensity of the P-polarized light are changed. Optionally, the birefringent crystal is a half-wave plate. The half-wave plate is configured to rotate around a rotation axis, and the rotation axis coincides with an optical axis of the light beam. The rotatable half-wave plate is an implementation of the light adjustment component. The half-wave plate is rotated to adjust the ratio of the S-polarized light and the ratio of the P-polarized light in the light beam. This simplifies a structure of the optical system and reduces system costs while the split ratios in which the light beam generated by the light source of the multi-lens optical system is allocated to the plurality of lenses are dynamically adjustable. In another possible implementation, the optical system further includes a first spatial light modulator and a second spatial light modulator. The first spatial light modulator is configured on an optical path between the first lens component and the first polarization beamsplitter mirror component, and is configured to modulate the first light beam. The first lens component projects the modulated first light beam to the first region to form a first image. The second spatial light modulator is configured on an optical path between the second lens component and the first polarization beamsplitter mirror component, and is configured to modulate the second light beam. The second lens component projects the modulated second light beam to the second region to form a second image. The optical system provided in this embodiment of this application is used in an implementation of a projection scenario. The split ratios in which the light beam generated by the light source is allocated to the plurality of lenses are dynamically adjustable, so that inconsistency between intensities of light projected by the plurality of lenses is resolved. In another possible implementation, the first region is adjacent to or partially overlaps the second region. The first image and the second image are spliced to form a projection image. In the optical system provided in this embodiment of this application, a m