摘要:
Liquid crystal compositions having a small value of .gamma. (V.sub.10 /V.sub.90) and a small .tau. (fast response speed) in order to cope especially with high speed response, while satisfying various characteristics required of STN display mode. These compositions comprise at least one compound expressed by formula (I) as a first component; expressed by any one of formulas (II-a) to (II-d) as a second component; and expressed by formula (III) or (IV) as a third component; and as a fourth component, a chiral component in the amount necessary for maintaining the ratio d/P of the cell thickness d (.mu.m) to the pitch length of twist P (.mu.m) in the range of 0.4 to 0.6 when the liquid crystal composition is used for liquid crystal display devices. ##STR1## wherein R.sup.1 to R.sup.9 represent an alkyl group having 1 to 10 carbon atoms; Z.sup.0 to Z.sup.4 represent, for example, --CH.sub.2 CH.sub.2 --; A.sup.1 to A.sup.4, B, C, E, and G independently represent, for example, 1,4-cyclohexylene or 1,4-phenylene; D represents 1,4-cyclohexylene or 1,3-pyrimidine-2,5-diyl; Q.sup.1 represents H or F; and q and m are independently 0 or 1.
摘要:
A aniline derivative represented by general formula (1) wherein R and R′ represent independently each other alkyl with 1 to 10 carbon, alkoxyalkyl with 1 to 10 carbon, or hydrogen; x represents cyano, halogen, haloalkyl, haloalkyloxy, or 2-cyanoethynyl; Y represents fluorine or hydrogen; na and nc represent independently each other 0 or 1; Za, Zb, and Zc represent independently each other a single bond, 1,2-ethylene, carbonyloxy, or oxymethylene; ring A1 represents 1,4-phenylene in which hydrogen may be substituted by fluorine; ring A2 and ring A3 represent independently each other 1,4-cyclohexylene, 1,4-phenylene in which hydrogen may be substituted by fluorine, or 1,3-pyrimidine-2,5-diyl.
摘要:
The present invention provides a liquid crystal composition comprising a component A being at least one compound selected from the group of compounds represented by Formulas (1-1) and (1-2) described in the specification and a component B being at least one compound selected from the group of compounds represented by Formulas (2-1) and (2-2) described in the specification.
摘要:
A chiral nematic liquid crystal composition which has a broad d/P margin, particularly for corresponding to a large size of LCD panel, while satisfying various characteristics sought for STN display mode, and which contains as a first component, at least one member of compounds expressed by the formulas (I-a) to (I-d); as a second component, at least one member of compounds expressed by the formulas (II) to (V); and as a third component, cholesteryl nonanoate, ##STR1## wherein the substituents are described herein.
摘要:
A liquid crystal composition comprising, for example, a first component of the formula (1-2), a second component of the formula (2-a) and a third component of the formulas (3) and (4), the respective contents being 3 to 30%, 10 to 60% and 20 to 80%, each by weight, ##STR1## wherein R, R.sup.1, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 each independently represent an alkyl group of C.sub.1-10 or an alkenyl group of C.sub.2-10 ; R.sup.7 represents an alkyl group, an alkenyl group or an alkoxymethyl group of C.sub.1-10 ; B.sup.1, C, D and J represent 1,4-cyclohexylene or 1,4-phenylene; E represents 1,4-cyclohexylene or pyrimidine-2,5-diyl; G represents 1,4-cyclohexylene or 1,4-phenylene wherein H at the lateral positions may be replaced by F; Z.sup.1 and Z.sup.6 represent --COO--, --C.sub.2 H.sub.4 -- or a single bond; and Z.sup.5 and Z.sup.7 represent --C--C-- or a single bond.
摘要翻译:一种液晶组合物,其包含例如式(1-2)的第一组分,式(2-a)的第二组分和式(3)和(4)的第三组分,各自的含量 (1-2)图像(2-a)R4(C)Z5(D)R5(3)R6( E)Z6(G)Z7(J)R7(4)其中R,R1,R3,R4,R5和R6各自独立地表示C1-10的烷基或C2-10的烯基; R7表示C1-10的烷基,烯基或烷氧基甲基; B1,C,D和J表示1,4-亚环己基或1,4-亚苯基; E表示1,4-亚环己基或嘧啶-2,5-二基; G表示1,4-亚环己基或1,4-亚苯基,其中侧向位置的H可以被F代替; Z 1和Z 6表示-COO - , - C 2 H 4 - 或单键; Z5和Z7表示-C-C-或单键。
摘要:
A speech communication device includes a data receiver that receives data from other device. The received data is stored in a buffer. The amount of the data in the buffer is monitored at a predetermined timing. When the amount of data in the buffer exceeds a steady delay threshold, an action determining unit instructs reduction in the stored data, reduction of an initial storage amount, and reduction of an upper limit threshold (a substantial buffer capacity).
摘要:
A ferroelectric liquid crystal composition having a negative large dielectric anisotropy value, AC stabilizing effect at low voltages and yet high-speed response properties, and a light switching element using the composition are provided, which composition comprises at least two components at least one of which is a compound expressed by the formula ##STR1## wherein R.sup.3 and R.sup.4 each represent the same or different linear or branched alkyl group of 1-18C and l is 1 or 2, and having a negative dielectric anisotropy value.A preferred embodiment of the above composition contains at least three components A, B and C, one of which is the above compound of the formula (A) and components B and C of which are each selected from a group of specified compounds, and the respective proportions of components A, B and C being 5-50 weight %, 20-70 weight % and 5-40 weight % based on the total weight of the three, respectively.
摘要:
A ferroelectric liquid crystal composition having a negative dielectric anisotropy, a good AC-stabilizing effect and still high-speed response properties, and a light switching element, are provided, which composition comprises a compound expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 each represent a linear or branched alkyl group, alkoxy group, alkanoyloxy group, alkoxycarbonyl group, alkoxycarbonyloxy group or alkanoyl group each of 1 to 18 carbon atoms; ##STR2## X.sub.1, X.sub.2 and X.sub.3 each represent hydrogen atom or halogen atom; P and Q each represent 0 or 1; and P+Q is 0 or 1.
摘要:
A photoalignment material includes an alignment polymer, a photoalignment additive including a compound represented by the following Chemical Formula 1 and an organic solvent. In Chemical Formula 1, R1 represents a cyclic compound. A and B independently represent a single bond or —(CnH2n)—. “n” represents an integer in a range of 1 to 12. Each —CH2— of A and/or B may be replaced with R3 represents an alkyl group having 1 to 12 carbon atoms, and each —CH2— of A and/or B may be replaced with —O—. R4 represents In Chemical Formula 1, each hydrogen atom excluding hydrogen atoms of R4 may be replaced with chlorine (Cl) or fluorine (F).
摘要翻译:光取向材料包括取向聚合物,包含由以下化学式1表示的化合物和有机溶剂的光对准添加剂。 在化学式1中,R 1表示环状化合物。 A和B独立地表示单键或 - (C n H 2n) - 。 n表示1至12范围内的整数.A和/或B的每个-CH 2可以被R 3代替,R 3表示具有1至12个碳原子的烷基,A和/或B的每个-CH 2可以 用-O-代替。 R4表示在化学式1中,除了R4的氢原子以外的各个氢原子可以被氯(Cl)或氟(F)代替。
摘要:
A ferroelectic smectic C liquid crystal mixture and a display element having a quick electrooptical response and a good memory property are provided, the ferroelectric mixture having a Ps of 60 nC/cm2 or more and a tilt angle of 24.degree. or more and comprising(A) a first component comprising at least one optically active compound expressed by the formula ##STR1## wherein l and m are 0 or 1, both are not 1; n is an integer of 3 to 8; X and Y are H, F, Cl, or CN, both X and Y are not H; A is --COO-- or --OCO--; and R is C3--8 alkyl or alkoxy , and(B) a second component comprising at least one optically active compound expressed by the formula ##STR2## wherein l, m, n and R are as defined above; and A is --COO--, --OCO--, --CH.sub.2 O-- or --OCH.sub.2 --, a total content of the first and second components being 60 mol % or more in the mixture.