▎ 摘　　要

NOVELTY - Multi-stable liquid crystal composition comprises first component is (4-cyclohexylcyclohexyl)benzene is represented by (I). The second component is (4-cyclohexylcyclohexyl)benzene is represented by (IV). The third component is amine derivative is represented by (V). The first component and second component constitute smectic liquid crystal composition. The contents of the first component and second component account for 5-95% and 5-95% of the smectic liquid crystal composition respectively. The smectic liquid crystal composition is 100%, and third component is added in weight fraction of 0.01-0.5% of the smectic liquid crystal composition. USE - Multi-stable liquid crystal composition. ADVANTAGE - The multi-stable liquid crystal composition has high optical anisotropy, and good scattering effect. DETAILED DESCRIPTION - Multi-stable liquid crystal composition comprises first component is (4-cyclohexylcyclohexyl)benzene is represented by formula (I). The second component is (4-cyclohexylcyclohexyl)benzene is represented by formula (IV). The third component is amine derivative is represented by formula (II). The first component and second component constitute smectic liquid crystal composition. The contents of the first component and second component account for 5-95% and 5-95% of the smectic liquid crystal composition respectively. The smectic liquid crystal composition is 100%, and third component is added in weight fraction of 0.01-0.5% of the smectic liquid crystal composition. R1=CH3, C2H5, C3H7, C4H9, C5H11, C6H13, C7H15, C8H17, C9H19; R2=C3H7, C4H9, C5H11, C6H13, F, Cl, CN, NCS or NO2; n1=0, 1 or 2; X1=H, F, Cl or CN; X2=H, F, Cl or CN; X3=H, F, Cl or CN; X4=H, F, Cl or CN; R3=CH3, C2H5, C3H7, C4H9, C5H11, C6H13, C7H15, C8H17, C9H19; R4=C3H7, C4H9, C5H11, C6H13, F, Cl, CN, NCS or NO2; n2=0, 1 or 2; X5=H, F, Cl or CN; X6=H, F, Cl or CN; X7=H, F, Cl or CN; X8=H, F, Cl or CN; X9=H, F, Cl or CN;X10=H, F, Cl or CN; Z=COO, CF2O, CH2O or CH2; R5=CH3, C2H5, C3H7, C4H9, C5H11, C6H13, C7H15; R6=2-18C alkyl chain; X-=chloride ion, bromide ion, a perchlorate ion, a carboxylate ion, a benzoate ion, a hexafluorophosphate ion, a tetrafluoroborate ion, and a trifluoromethanesulfonate ion, benzenesulfonate ion, p-toluenesulfonate ion; and Ring A-Ring D=group of formulae (II)-(III). . INDEPENDENT CLAIMS are included for the following: (1) a electrically controlled optical diffraction element, which comprises upper substrate layer, upper conductive layer, liquid crystal layer, lower conductive layer, lower substrate layer, upper conductive layer is provided below the upper substrate layer; and (2) a method for preparing electrically controlled optical diffraction element, which involves cleaning the upper and lower substrate layers with conductive coating on one side, target pattern is etching on the side with conductive coating on the lower substrate, pattern etching on the side of the upper substrate with conductive coating for liquid crystal driving, then cleaning the upper and lower substrate layers, spraying spacers on one of the upper and lower substrates, and printing the frame adhesive on the other substrate by screen printing or dispensing, quantitative dripping of liquid crystal on substrate with plastic frame printed on it, laminating the upper and lower substrates under vacuum environment of 10 pascal, curing frame glue, light diffraction layer is fabricated by using etching or nano-imprinting and cutting large substrates into pellets.