| abstract |
The present invention relates a liquid crystalline medium comprising one or more liquid crystalline compounds, one or more dichroic dyes, and one or more compounds capable of promoting or inducing homeotropic alignment to the adjacent liquid crystal medium at a given temperature selected from the group of compounds (A), having a three-dimensional structure, a molecular weight of greater than 450 Da, and one or more anchor groups, or the group of organic compounds (B) having one or more ring groups, and one or more anchor groups. The invention furthermore relates to a temperature-reactive device for the regulation of light transmission, containing such liquid crystalline medium, and a process for the temperature-dependent control of light transmission through the layer of such liquid-crystalline medium. |