| 摘要 |
PURPOSE:A liquid crystal element having the composition in which a specific pyrylium compound is dissolved in a liquid crystal, and capable of forming optical images corresponding to optical signals given from He-Ne laser, YAG laser, semiconductor laser or Ar laser. CONSTITUTION:A liquid crystal element containing a liquid crystal composition of a compound of formula I [R1-R4 are (substituted) aryl or (substituted) heterocyclic ring; R5 is H, alkyl or (substituted) aryl; X1 and X2 are O, S or Ce; A<-> is anion], e.g. the compound of formula II, preferably in an amount of 1-3wt% dissolved in the phase A or C of preferably a smectic liquid crystal having positive dielectric anisotropy. USE:Optical disk systems of the recording method forming a large scope display and pit.
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