摘要:
Liquid crystal compositions comprising: at least one of the compounds of the general formula (I) and at least one of the compounds of the general formula (II); and at least one of the compounds of the general formula (III), or further including at least one of the compounds of the general formula (IV) are provided.
All the symbols are as defined in the appended claims. The compositions are suitable for use in highly multiplexed displays of the supertwisted birefringence effect mode.
摘要:
Liquid crystal compositions and display devices using the compositions are disclosed. The compositions contains, as main components, at least one compound of the general formula (I), and at least one compound of the general formula (II), or as well as the above components, at least one compound selected from the compounds of the general formulas (III), (IV) and (V), and/or at least one compound of the general formula (VI). (wherein all the symbols are as defined in the appended claims).
摘要:
Liquid crystal compositions and display devices using the compositions are disclosed. The compositions contains, as main components, at least one compound of the general formula (I), and at least one compound of the general formula (II), or as well as the above components, at least one compound selected from the compounds of the general formulas (III), (IV) and (V), and/or at least one compound of the general formula (VI). (wherein all the symbols are as defined in the appended claims).
摘要:
Liquid crystal composition having a high voltage-holding ratio of liquid crystal element and being almost unchanged in the helical pitch even when subjected to purification treatment with adsorbents or the like, which composition is a liquid crystal mixture of an achiral liquid crystal compound of the following formula (IV) with a chiral compound having an adsorptivity to adsorbents, not greater than that of the achiral compound:
wherein A', B', C' and D' each independently are trans-1,4-cyclohexylene, 1-cyclohexene-1,4-diyl or 1,4-phenylene; g, h and i each are 0 or 1; (g+h+i)≧1 ; X', Y' and Z' each independently are a single bond, -CH₂-CH₂-, -CH=CH- or -C≡C-; R⁷ is C n H 2n+1 -, C n H 2n-1 or C n H 2n+1 OC k H 2k -; R⁸ is C m H 2m+1 -, C m H 2m+1 O-, F, CHF₂O or CF₃O-; n and m each independently are an integer of 1 to 18; k is an integer of 1 to 17; (n+k) is 2 to 18; at least one of X', Y' and Z' is single bond; when ring D' is 1,4-phenylene and R⁸ is F, CHF₂O- or CF₃O-, then H at ortho position as regards R⁸ may be replaced by F; and "Then" g is 1 and ring B' or C' is 1,4-phenylene, when H at the lateral position of the ring may be replaced by F. It is preferred in order to exhibit a high voltage-holding ratio that the achiral liquid crystal compound have as a polar group, a functional group (such as F and CF 3 O-) limited to a halogen atom such as F, Cℓ, etc. or an ether bond, besides the C-C bond and the C-H bond. As to chiral compounds those having a functional group restricted to only a halogen atom or an ether bond are preferred, in the same aspect, chiral agent compounds having a polar group of -CN group as a fuctional group are unsuitable.
摘要翻译:液晶组合物具有高电压保持率的液晶元件,并且即使在用吸附剂等进行纯化处理时几乎没有变化,该组成是以下的非手性液晶化合物的液晶混合物 式(Ⅳ)与对吸附剂具有吸附性的手性化合物不大于非手性化合物:其中A',B',C'和D'各自独立地为反式-1,4-亚环己基,1 环己烯-1,4-二基或1,4-亚苯基; g,h和i各自为0或1; (G + H + I)> / = 1; X',Y'和Z'各自独立地是单键,-CH 2 -CH 2 - , - CH = CH-或-C≡CENTICALC-; R 7是C n H 2n + 1,C n H 2n-1或C n H 2n + 1 OC k H 2k-; R 8是C m H 2n + 1,C m H 2m + 10,F,CHF 2 O或CF 3 O-; n和m各自独立地为1〜18的整数; k为1〜17的整数。 (n + k)为2〜18; X',Y'和Z'中的至少一个是单键; 当环D'为1,4-亚苯基且R 8为F,CHF 2 O-或CF 3 O-时,则R 8在邻位的H可被F取代; “然后”g为1,环B'或C'为1,4-亚苯基,当环的横向位置的H可以被F代替时,为了表现出高的电压保持率,优选为 除CC键和CH键之外,非手性液晶化合物具有极性基团,限于诸如F,C 1等卤素原子或醚键的官能团(如F和CF 3 O-)。 对于具有仅限于卤素原子或醚键的官能团的手性化合物是优选的,在同一方面,具有-CN基极性基团的手性试剂化合物作为官能团是不合适的。
摘要:
A liquid crystal composition comprising (1) at least one compound selected from those expressed by the formula (I) and (2) at least one compound selected from those expressed by the formulas (II), (III), (IV) and (V):
wherein R₁ to R₅ are C₁₋₁₀ alkyl; R₆ and R₇ are C₁₋₁₀ alkyl or alkenyl; X is H or F; X₁ and X₂ are F, -CF₃, -OCF₃, -CHF₂ or -OCHF₂; Y₁ and Y₂ are H or F; Z₁, Z₂ and Z₄ are -COO-, -CH₂CH₂-or a single bond; Z₃, Z₅ and Z₆ are -COO-, -CH₂CH₂-, -C≡C- or a aingle bond; and A is
which composition is provided with characteristics of high specific resistance, low viscosity while keeping small current consumption, a suitable clearing point and threshold voltage.