COMPACT HEAD-MOUNTED DISPLAY SYSTEM

摘要

There is provided an optical system, including a light-transmitting substrate (20) having at least two major surfaces (26) and edges, an optical prism (54) having at least a first (58), a second (56) and a third (60) surface, for coupling light waves having a given field-of-view into the substrate by total internal reflection, at least one partially reflecting surface located in the substrate, the partially reflecting surface being orientated non-parallelly with respect to the major surfaces of the substrate, for coupling light waves out of the substrate, at least one of the edges (50) of the substrate is slanted at an oblique angle with respect to the major surfaces, the second surface of the prism is located adjacent to the slanted edge of the substrate, and a part of the substrate located next to the slanted edge is substantially transparent, wherein the light waves enter the prism through the first surface of the prism, traverse the prism without any reflection and enter the substrate through the slanted edge.

主权项

1. An optical system, comprising:
a light-transmitting substrate having at least two major surfaces and edges; an optical prism having at least a first, a second and a third surface, for coupling light waves having a given field-of-view into the substrate by total internal reflection; at least one partially reflecting surface located in the substrate, the partially reflecting surface being orientated non-parallelly with respect to the major surfaces of said substrate, for coupling light waves out of the substrate; at least one of the edges of the substrate is slanted at an oblique angle with respect to the major surfaces; the second surface of the prism is located adjacent to the slanted edge of the substrate, and a part of the substrate located next to the slanted edge is substantially transparent, characterized in that the light waves enter the prism through the first surface of the prism, traverse the prism without any reflection and enter the substrate through the slanted edge.