Patent ID: 7724443
Filing Date: 2010-05-25
Classification: G02B

Abstract:
1. An optical device, comprising: a light-transmitting substrate having at least two major surfaces and edges, a plurality of partially reflecting surface carried by the substrate, the partially reflecting surfaces being parallel to each other and not parallel to any of the edges of the substrate with at least one of the partially reflecting surfaces not intersecting at least one of the two major surfaces; and optical means with an active input aperture for coupling light waves from a display source into the substrate by total internal reflection, the optical means intersecting with at least one of the two major surfaces of the substrate, the active input aperture being sufficiently large and illuminated by light waves from the display source so that a single point on the boundary line between the edge of the optical means and one of the major surfaces of the substrate is illuminated by two different rays from one of the light waves from the display source entering the substrate at two different locations.