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公开(公告)号：US20240361592A1
公开(公告)日：2024-10-31
申请号：US18701123
申请日：2022-10-10
CPC分类号： G02B27/0081 , G02B6/0016 , G02B6/0038 , G02B27/0172
摘要： In example embodiments. a waveguide apparatus is provided that may be used in a display device. The waveguide includes an in-coupler, an out-coupler, and at least a first eye-pupil expander along a first optical path from the in-coupler to the out-coupler. The in-coupler comprises a first diffraction grating and a second diffraction grating overlaying the first diffraction grating. wherein grating lines of the first and second diffraction gratings are parallel to one another. The first eye-pupil expander comprises a third diffraction grating and a fourth diffraction grating overlaying the third diffraction grating. The out-coupler comprises a fifth diffraction grating and a sixth diffraction grating overlaying the fifth diffraction grating.
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公开(公告)号：US20240264354A1
公开(公告)日：2024-08-08
申请号：US18566472
申请日：2022-06-09
发明人： Oksana SHRAMKOVA , Valter DRAZIC
CPC分类号： G02B6/0016 , G02B27/0172 , G02B27/4205 , G02B27/0081
摘要： In example embodiments, an apparatus includes a waveguide having an in-coupler an out-coupler. The waveguide has a first surface and an opposite second surface, and the waveguide provides at least one optical path from the in-coupler to the out-coupler. The in-coupler comprises a first diffraction grating with a first grating vector on the first surface and a second diffraction grating with a second grating vector on the second surface. At least one of the first and second grating vectors is not oriented along any of the optical paths from the in-coupler to the out-coupler. The second grating may alter the polarization state of in-coupled light and/or change the direction of the in-coupled light to aid in preventing the light from being out-coupled by the first diffraction grating.
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