molecules of the liquid crystal compounds and dyes are aligned along one direction and in parallel with the surfaces of the electrodes to be a homogeous alignment the compositions containing the dyes were each charged between a pair of transparent glass plates the glass plates each have on the opposite faces transparent electrodes and controlling films on the electrodes and the exposed surfaces of the glass plates the gap between the glass plates was about 10 micrometers the orientation controlling films were of cured polyimide when an electric potential is not applied to the elements an electric potential molecules of the liquid crystal compounds and dyes are aligned along one direction and in parallel with the surfaces of the electrodes to form a homogeneous alignment mesurement of absorption spectra a and a u22a5 of the guest host liquid crystal display devices was conducted wherein a liquid polarized in the direction parallel with the orientation of the molecules of the liquid crystals and a light polarized in the direction parpendicular to the orientation were used to determine absorbances a a u22a5 and the maximal wavelength of absorbed light in determining the absorbances light absorption due to host liquid crystal compositions and a reflection loss by the surfaces of the elements were taken into calculation for compensation from the thus obtained absorbances a and a u22a5 s 39 s of the dyes.