| 摘要 |
A liquid crystal dimmer in which transparent conductive films are provided on the mutually opposed faces of a pair of transparent substrates and a medium holding therein a liquid crystal material and a dichroic dye aligned according to the alignment of the liquid crystal material. The index of double refraction ( DELTA n) of the liquid crystal material is less than 0.15. The relationship between the absorptance (A//) along the major axis of the molocule of the dichroic dye and the absorptance (A ORTHOGONAL ) along the minor axis thereof is expressed by 1.0>/=[(A//-A ORTHOGONAL )/(A//+2A ORTHOGONAL )]>/=0.75. Another liquid crystal dimmer is disclosed in which the ratio (liquid crystal content) of the liquid crystal material to the medium is 50 wt.% or more, the ratio of concentration of the dichroic dye to that of the liquid crystal is 1 wt.% or more, and the distance between the transparent conductive films is in the range from 10 to 40 mu m.
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