Stacked backlighting system using microprisms

Details Stacked backlighting system using microprisms Stacked backlighting system using microprisms

1996-05-02

1999-07-20

Sanghaui, Hemang

Optical waveguides

Noncyclindrical or nonplanar shaped waveguide

385 36, 385901, 349 62, 349 64, 362 32, G02B 610

Patent

active

059266015

ABSTRACT:
An assembly backlighting a liquid crystal flat panel display or other such arrangement requiring backlighting is disclosed herein. The assembly includes a plurality of light pipes and is capable of a multi-mode operation as well as achieving an enhanced dimming. This assembly is composed of two or more light pipes placed in a stacked configuration. Each light pipe has a set of specially configured microprisms which, cooperating with the light pipe, provides an efficient backlighting technique with a controllable degree of collimation. The disclosed assembly is particularly useful for displays which require a very bright backlighting, a wide dimming range and which must be capable of illuminating a given active area with light of different spectra.

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M.F. Weber, "Retroreflecting Sheet Polarizer", SID 92 Digest 427-429.

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