Certain substituted anthracene-type compounds have been found to be useful as isotropic dyestuffs in guest-host combinations with nematic, cholesteric and smectic liquid crystals and other well-known dichroic dyestuffs. By "isotropic" it is meant that the disclosed dyestuffs have optical order parameters (S) very close to zero. Use of the disclosed isotropic dyestuffs with additional well-known dichroic dyes in liquid crystal display devices, provides displays which alter between one colored state and another, depending upon the presence or absence of an electric field across the display.
已发现某些取代的
蒽类化合物可作为各向同性
染料,与向列型、胆甾型和胶粘型液晶及其他众所周知的二向色
染料客座组合使用。所谓 "各向同性",是指所公开的
染料的光学阶次参数(S)非常接近于零。在液晶显示设备中使用已公开的各向同性
染料和其他众所周知的二色性
染料,可提供在一种彩色状态和另一种彩色状态之间变化的显示器,这取决于显示器上是否存在电场。