Patent Number: 7,042,610

Title: Method and apparatus for improved waveplates and suppression of stray light in LCoS kernel applications

Abstract: Optical components are louvered with a light absorptive material that absorbs stray light rays. The louvers are constructed, for example, using a "black" thin film coating between sheets of glass. The louvered components are placed in an optical path at one or more orientations. In one embodiment, a vertically oriented louvered component and a horizontally oriented louvered component are individually located in a light path to reduce and/or eliminate stray light having either horizontal and/or vertical vector components. Compensated higher order waveplates are constructed from birefringent material by placing two higher order waveplates (a n.lamda. waveplate and a (n+.DELTA.).lamda. waveplate.) in proximity to each other such that their principle retardation axes are perpendicular. In one embodiment, the higher order waveplates include louvers for stray light suppression.

Inventors: Berman; Arthur (San Jose, CA)

Assignee: LightMaster Systems, Inc.

International Classification: G02B 26/08 (20060101)

Expiration Date: 5/09/02018