Patent Number: 6,295,145

Title: Switchable holographic device

Abstract: A switchable holographic device generally comprises a substrate having two generally opposed surfaces and a plurality of holographic fringes recorded in the substrate. The holographic fringes are configured to switch between active and passive states upon application of an electrical field. One or more of the plurality of holographic fringes are positioned such that a surface of the fringe is angled relative to one of the substrate surfaces. The holographic device further comprises a pair of electrodes each positioned generally adjacent to one of the substrate surfaces and operable to apply an electrical field to the fringes to switch the fringes between their active and passive states. One of the pair of electrodes has a plurality of independently controlled segments. Each of the segments is positioned over an area of the substrate having holographic fringes positioned within a common range of angles relative to the substrate surface.

Inventors: Popovich; Milan M. (Leicester, GB)

Assignee: Digilens, Inc.

International Classification: G02B 5/32 (20060101); G02B 005/32 ()

Expiration Date: 09/25/2018