Patent Number: 6,169,613

Title: Planar holographic optical device for beam expansion and display

Abstract: A holographic optical device includes a light transmissive substrate carrying first and second laternally separated holographic optical elements. The first holographic optical element diffracts incident light into the substrate where it is trapped by internal reflection so that light impinges more than once at different angles at different locations on at least one of the first and second holographic optical elements with a significantly higher efficiency for one angle of incidence. The second holographic optical element diffracts light out of the substrate. The second holographic optical element may be a display hologram for displaying a three-dimensional image.

Inventors: Amitai; Yaakov (Rehovot, IL), Friesem; Asher Albert (Rehovot, IL), Shariv; Isaac (Rehovot, IL)

Assignee: Yeda Research & Devel Co., Ltd.

International Classification: G02B 5/32 (20060101); G02B 6/124 (20060101); G02B 6/34 (20060101); G02B 6/28 (20060101); G03H 1/22 (20060101); G03H 1/00 (20060101); G02B 6/43 (20060101); G02B 005/32 (); G03H 001/22 ()

Expiration Date: 01/02/2018