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Waveguide display two-dimensional pupil expansion method based on polarization holographic grating

A volume holographic grating, two-dimensional display technology, applied in diffraction grating, optics, optical components, etc., can solve the problems of lack of theoretical guidance and specific methods, achieve high diffraction efficiency, reduce volume weight, reduce loss and scattering. Effect

Active Publication Date: 2022-03-25
SOUTHEAST UNIV
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Problems solved by technology

[0007] However, there is a lack of effective theoretical guidance and specific methods on how to use the excellent performance of PVG to break through the bottlenecks of existing diffractive waveguides in terms of field of view and exit pupil.

Method used

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  • Waveguide display two-dimensional pupil expansion method based on polarization holographic grating
  • Waveguide display two-dimensional pupil expansion method based on polarization holographic grating
  • Waveguide display two-dimensional pupil expansion method based on polarization holographic grating

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Embodiment Construction

[0033] The invention utilizes the polarizing body holographic grating as a waveguide coupling device, and realizes the two-dimensional exit pupil expansion effect at the exit pupil position through a grating fork-type composite structure. The waveguide structure mainly includes two elements: waveguide medium and polarized volume holographic grating (PVG).

[0034] Wherein, the waveguide medium is an optical medium with a certain refractive index and transmittance, and the material may be optical glass or resin glass with high transparency. The range of the refractive index is (1.5-2.2), and the optional range of the preferred refractive index is (1.8-2.0). The waveguide medium can be in the shape of a flat plate or other free-form surfaces. There are at least two polarized volume holographic gratings at different positions on the waveguide medium to respectively complete the introduction of light into the medium and pupil expansion and export, which are respectively referred ...

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Abstract

The invention relates to a waveguide display two-dimensional pupil expansion method based on a polarization holographic grating. Based on the polarization diffraction characteristic of a polarization body holographic grating, the polarization body holographic grating serves as a waveguide coupling element, and a light beam from a micro image source system is guided in and transmitted in a waveguide medium. And then two-dimensional pupil expansion and export of a transmitted image light field are completed through the composite polarization body holographic grating structure, and finally the transmitted image light field enters human eyes, so that a waveguide augmented reality imaging function is realized. The excellent polarization diffraction characteristic of PVG is utilized, only two grating areas need to be used in a waveguide pupil expanding structure, the waveguide area is greatly reduced, the light beam propagation distance is correspondingly reduced, the size and weight of a waveguide device are reduced, meanwhile, loss and scattering of light beams in waveguides are further reduced, and the light beam propagation efficiency is improved. And the final imaging effect is improved.

Description

technical field [0001] The invention relates to a waveguide display two-dimensional pupil expansion structure and method based on a polarized volume holographic grating, which is used in AR wearable display devices to realize efficient and high-quality waveguide imaging with a large exit pupil and a large field of view, and reduce the volume of the device with weight. Background technique [0002] As a hot spot in the field of information display technology at present, the development of augmented reality (Augmented Reality, AR) near-eye display technology carries people's beautiful vision for the future information interaction mode, and it is widely used in civilian (such as AR glasses) and military (such as pilot helmet) scenarios. It has broad application prospects. Despite the rapid development of AR technology, compared with AR content, computing, and network, the development of the most basic AR display device is still lagging behind, and the volume, weight, and displ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02B27/01G02B5/18G02F1/137G03H1/02
CPCG02F1/13718G02B27/0103G02B5/1842G03H1/0248G02B5/1876G02B27/0081
Inventor 翁一士张宇宁顾雨晨张李萱王闯魏然
Owner SOUTHEAST UNIV
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