Waveguide display with cross-polar eye pupil expander

By using a cross-polarization diffraction grating design in the waveguide display of AR/VR glasses, the problem of limited field of view angle was solved, and the field of view was extended in two directions, improving the field of view angle and image quality of the display.

CN115485605BActive Publication Date: 2026-07-07INTERDIGITAL CE PATENT HOLDINGS SAS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INTERDIGITAL CE PATENT HOLDINGS SAS
Filing Date
2021-04-01
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing AR/VR glasses with waveguide displays have limitations in field of view, especially the field of view limitation along one direction, which effectively limits the field of view in another direction, making it impossible to meet specific aspect ratio requirements.

Method used

A diffraction grating design with cross-polarization states is adopted. By setting diffraction gratings with first and second polarization states on different surfaces of the waveguide, light with different polarization states is diffracted preferentially to achieve effective expansion of the upper and lower parts of the image. Combined with inner and outer couplers, the effective propagation and output of light in the waveguide are ensured.

Benefits of technology

This technology enables the waveguide display to extend its field of view in two directions, improving the display's field of view angle, meeting the aspect ratio requirements of AR/VR applications, and enhancing the quality of image display and user experience.

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Abstract

Embodiments disclosed herein can include optical systems that can be included in waveguide displays. An example device includes an image generator configured to generate an image having an upper portion and a lower portion. A waveguide is provided with an in-coupler and an out-coupler, the in-coupler arranged to couple the upper portion and the lower portion of the image to the out-coupler along an optical path. At least a first polarization selective diffraction grating and a second polarization selective diffraction grating are configured to cooperatively direct the upper portion of the image along the optical path toward the out-coupler. At least a third polarization selective diffraction grating and a fourth polarization selective diffraction grating are configured to cooperatively direct the lower portion of the image toward the out-coupler.
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