Highly efficient and compact frontlighting for polarization-base

Details Highly efficient and compact frontlighting for polarization-base Highly efficient and compact frontlighting for polarization-base

1997-08-07

1999-04-20

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359619, 359627, G02B 2710, G02B 2714

Patent

active

058962328

ABSTRACT:
An optical device and a display are disclosed that include an illumination source which provides unpolarized light. An array of polarizing plates have an entrance surface, which receives the unpolarized light at an oblique angle, and an exit surface which provides a polarized light having a first polarization and exiting the array at a substantially perpendicular direction to the exit surface. A light valve selectively rotates the polarized light to form an image forming light, and an imaging lens receives the image forming light and forms an image. Each of the polarizing plates in the array has opposing surfaces that are tilted relative to its entrance and exit surfaces. Each polarizing plate includes a polarizing layer formed on one of the opposing tilted surfaces, and a half-wave optical retardation layer formed on the polarizing layer.

REFERENCES:
patent: 3858001 (1974-12-01), Bonne
patent: 4012116 (1977-03-01), Yevick
patent: 4111695 (1978-09-01), Yevick
patent: 5096520 (1992-03-01), Faris
patent: 5275538 (1994-01-01), Monji et al.
patent: 5537144 (1996-07-01), Faris

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