| abstract |
The present invention relates to a liquid crystal medium comprising at least one naphthothiadiazole derivative of the formula (I); and to the use of said liquid-crystalline medium for optical, electro-optical and electronic purposes, in particular in devices, such as windows, for regulating the energy path from an external space to an internal space: In the above formula, R 11 , R 12 , A 11 , A 12 , A 21 , A 22 , Z 11 , Z 12 , Z 21 , Z 22 , W, X 11 , X 12 , r and s have the meaning given in claim 1 . has |