The liquid crystal modulator on the basis of the waveguide mode in the twist structure with the high twist angle

On the basis of the analysis of color characteristics of different LC display units the criterion for an assessment of an unchromaticity of black-and-white images is entered. For the adequate description of the optical properties of the LC modulator the necessary set of three characteristics is offered: contrast of the modulator, average on a range; the average on a range passage of the modulator for a status «is opened»; a modulator akhromatichnost is «open» for a status. Computer simulation of optical characteristics of LC modulator working in the waveguide mode on the basis of LC structure with twist angle 270$^\circ$ is executed. For this LC device values of optimum parameters are found.