Automatic darkening filter with offset polarizers

Details Automatic darkening filter with offset polarizers Automatic darkening filter with offset polarizers

2011-02-08

2011-02-08

Nelms, David (Department: 2871)

Liquid crystal cells, elements and systems

Liquid crystal system

Liquid crystal eyewear

C349S076000, C349S081000, C349S099000, C349S103000, C349S180000

Reexamination Certificate

active

07884888

ABSTRACT:
A protective automatic darkening filter construction10includes two low twist liquid crystal cells26, 30interspersed between a series of offset polarizers24, 28, 32. The resulting construction provides improved homogeneity in the dark state as viewed by the user over a large viewing angle. By reducing variations in shade, visibility through the filter may be improved.

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