Advanced liquid crystal tunable filters and method

Details Advanced liquid crystal tunable filters and method Advanced liquid crystal tunable filters and method

2006-09-20

2009-12-08

Font, Frank G (Department: 2883)

Liquid crystal cells, elements and systems

Liquid crystal system

Variable or rotatable retarder used with other retarders to...

C349S061000, C349S096000, C349S117000, C349S119000

Reexamination Certificate

active

07630022

ABSTRACT:
A birefringent optical filter and associated method are described which demonstrate improved performance for both fixed and tunable filter configurations. One exemplary embodiment involves an initial filter configuration, having an output polarizer, that exhibits an initial spectral filter response having an undesired transmission feature and a desired transmission feature. An additional polarizer follows the output polarizer and an adjustable retarder is disposed directly between the output polarizer and the additional polarizer to produce an overall spectral filter response that eliminates the undesired transmission feature, while passing the desired transmission feature. Another exemplary embodiment uses at least one reflective polarizer for passing light along the filter optical path, which light is characterized by a selected polarization, and for reflecting a rejected light that is characterized by a different polarization such that the rejected light is directed out of the optical path.

REFERENCES:
patent: 5231521 (1993-07-01), Johnson et al.
patent: 7362489 (2008-04-01), Wang et al.
patent: 2008/0007813 (2008-01-01), Wang et al.

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