| CPC G02B 27/0172 (2013.01) [G02F 1/133638 (2021.01); G02B 2027/0178 (2013.01)] | 12 Claims |
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1. AR glasses, comprising an image projection device, an optical lens, a beam splitter, a first ¼λ wave plate, a curved half-mirror, and a liquid crystal dimming film, wherein the liquid crystal dimming film comprises a polarizer and a dye-doped liquid crystal layer, light transmittance of the dye-doped liquid crystal layer is adjusted by adjusting a voltage applied to the dye-doped liquid crystal layer, and when the dye-doped liquid crystal layer absorbs light, it blocks external stray light and prevent the display screen from being viewed from an outside world to achieve privacy protection; and
wherein after light emitted by the image projection device passes through the optical lens, it passes through the beam splitter obliquely arranged, the beam splitter converts the light into horizontal linearly polarized light and reflects it to the first ¼λ wave plate, the first ¼λ wave plate converts the linearly polarized light into circularly polarized light, part of the circularly polarized light is reflected to observer's eyes through the curved half-mirror, and part of the circularly polarized light is transmitted through the half-mirror and hits the liquid crystal dimming film and is absorbed by the liquid crystal dimming film.
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