TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The liquid crystal medium has an optical anisotropy ( Delta n) of greater than or equal to 0.150, a helical twisting power absolute value of more than 20 mu m-1, and a band wavelength width reflected in the visible luminescence of the electro-magnetic spectrum, and further comprises at least one polymerization moderator. The polymerizable chiral compounds include 2-methyl-1-(2-methyl-1-naphthyl)naphthalene compound of formula (I) or benzene compound of formula (II). The polymerizable non-chiral compounds include polymerizable non-chiral mesogenic compound. The mesogenic compound includes phenyl 4-cyclohexylcyclohexanecarboxylate of formula (III) to (VII). The polymerizable chiral compounds and the polymerizable non-chiral compounds are present in an amount of 0.1-10 wt.%.R1 = H or P1;P1 = polymerizable group;A1, B1 = optionally L-substituted 1,4-phenylene or trans-1,4-cyclohexylene;X1, X2 = -O-, -COO-, -OCO-, -O-CO-O- or single bond;Z1 = -COO-, -OCO-, -O-CO-O-, -OCH2-, -CH2O-, -CF2O-, -OCF2-, -CH2CH2-, -(CH2)4-, -CF2CH2-, -CH2CF2-, -CF2CF2-, -C=C-, -CH=CH-, -CH=CH-COO-, -OCO-CH=CH- or single bond;t = 0-3;a = 0-2;b = 0 or 1-12;z = 0-1;L = naphthalene ring, F, Cl, CN, 1-5C alkylhalides, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkyloxycarbonylor alkoxy-oxycarbonyl;Z2, Z3 = -COO-, -OCO-, -CH2CH2-, -CF2O-, -OCF2-, -C=C-, trans-CH=CH-, -OCOCH=CH-, -CH=CH-COO- or single bond;r = 0-3;x, y = 0 or 1-12;u, v = 0-1;R2 = alkyl, alkoxy, fluorinated alkyl or alkoxy, alkenyl, alkenyloxy, fluorinated alkenyl or alkenyloxy, 1,4-dimethylcyclohexane, p-xylene or 2-fluoro-1,4-dimethyl-benzene;L11, L12, L21, L22, L31, L32 = H or F;X11 = CN or NCS;i = 0 or 1;R3, R4 = alkyl, alkoxy or fluorinated alkyl or fluorinated alkoxy having 1-7 carbon atoms, alkenyl, alkenyloxy or fluorinated alkyl or alkenylalkoxy having 2-7 carbon atoms, 1,4-dimethylcyclohexane, 2,5-dimethyltetrahydropyran, 2,5-dimethyl-1,3-dioxane, p-xylene, 2-fluoro-1,4-dimethyl-benzene, 2-fluoro-1,4-dimethyl-benzene or 1,3-difluoro-2,5-dimethyl-benzene;X21, X31 = halo or 1-3C alkenyl or alkenyloxy;Z31 = -CH2CH2-, -CF2CF2-, -COO-, -CH=CH-, -CF=CF-, -CH2O- or single bond;l, m, n, o = 0 or 1;R41, R42, R51, R52 = R3, 1,4-dimethylcyclohexane,1,4-dimethylcyclohexene, 3,6-dimethylcyclohexene, p-xylene, 2-fluoro-1,4-dimethyl-benzene, 1,3-difluoro-2,5-dimethyl-benzene or 2,3-difluoro-1,4-dimethyl-benzene;Z41, Z42, Z51, Z52 = -COO-, trans-CH = CH-, trans-CF = CF-,-CH2O-,-CF2O-,-C=C- or single bond; andp, q = 0, 1 or 2.