| 摘要 |
An electro-optical glare protection filter for e.g. a protective mask for welding comprises at least two successively arranged liquid crystal cells ( 20, 30 ) of the type "twisted nematic" (TN) with polarization layers ( 21, 25, 31, 35 ), wherein the polarization directions of two respective polarization layers ( 21, 25, 31, 35 ), which are allocated to a liquid crystal cell ( 20, 30 ) are respectively twisted in relation to one another. Hereby the polarization directions of two respective polarization layers ( 21, 25, 31, 35 ), which are allocated to a liquid crystal cell ( 20, 30 ) are uncrossed, i.e. twisted by an angle different to 90° in relation to one another.
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