| 摘要 |
There is provided an optical device, including a light waves-transmitting substrate having two major surfaces and edges, optical means for coupling light into the substrate by total internal reflection, and a plurality of partially reflecting surfaces ( 22 a, 22 b) carried by the substrate wherein the partially reflecting surfaces ( 22 a, 22 b) are parallel to each other and are not parallel to any of the edges of the substrate, and wherein one or more of the partially reflecting surfaces ( 22 a, 22 b) is an anisotropic surface.
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