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    • 4. 发明授权
    • Bistable ferroelectric liquid crystal cell
    • 双稳态铁电液晶电池
    • US6046789A
    • 2000-04-04
    • US971176
    • 1997-11-17
    • Jurg FunfschillingMartin Schadt
    • Jurg FunfschillingMartin Schadt
    • G02F1/137C09K19/02G02F1/1335G02F1/141G02F1/13
    • C09K19/0225G02F1/141
    • Known liquid crystal cells have a nematic liquid crystal configuration and, in accordance with this configuration, are referred to as TN or STN cells. It is true that such cells are adequate for many applications. However, their image quality is dependent to a very great extent on the user's angle of view. Furthermore, TN and STN cells require a continuously applied signal voltage if it is intended to display or store information on one. Bistable liquid crystal cells having a ferroelectric, chiral smectic liquid crystal layer do not have these disadvantages of nematic display cells. However, the commercial production of such bistable display cells has scarcely become established to date. This is in particular because they are not very suitable for reliably storing information or do not permit absolutely equivalent switching between the two bistable positions of the director. The invention now proposes a novel, bistable liquid crystal cell which avoids precisely these disadvantages. Starting from the SBFLC display cell disclosed in EP-A 0 405 346, the display cell according to the invention is distinguished in that its liquid crystal layer contains polymerized molecules and is formed, by treatment with light and an alternating electric field, in such a way that it has two equivalent, bistable switching states.
    • 已知的液晶单元具有向列型液晶结构,根据该结构,称为TN或STN单元。 这样的电池确实适用于许多应用。 然而,他们的图像质量在很大程度上取决于用户的观点。 此外,如果TN和STN单元旨在将信息显示或存储在一个上,则需要连续施加的信号电压。 具有铁电手性近晶液晶层的双稳态液晶单元不具有向列型显示单元的这些缺点。 然而,迄今为止,这种双稳态显示单元的商业生产几乎没有建立。 这特别是因为它们不太可靠地存储信息,或者不允许在导演的两个双稳态位置之间进行绝对等效的切换。 本发明现在提出了一种新颖的双稳态液晶单元,其精确地避免了这些缺点。 从EP-A 0 405 346中公开的SBFLC显示单元开始,根据本发明的显示单元的特征在于,其液晶层包含聚合分子,并且通过用光和交变电场处理形成在这样的 它具有两个等效的双稳态切换状态。
    • 9. 发明授权
    • Optically active methyl dioxanes
    • 光活性甲基二恶烷
    • US5518653A
    • 1996-05-21
    • US371617
    • 1995-01-12
    • Richard BucheckerJurg FunfschillingMartin Schadt
    • Richard BucheckerJurg FunfschillingMartin Schadt
    • C07D319/06C07D405/04C09K19/34C09K19/58
    • C09K19/3402C07D319/06C09K19/588C09K2019/3422
    • Optically active compounds of the formula ##STR1## wherein n stands for the number 0 or 1; Z.sup.1 is a single covalent bond or --CH.sub.2 CH.sub.2 --; Z.sup.2 is a single covalent bond, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --COO-- or --OOC--; rings A.sup.1 and A.sup.2 each independently represent trans-1,4-cyclohexylene or optionally halogen-, cyano- and/or methyl-substituted 1,4-phenylene in which optionally 1 CH group or 2 CH groups is/are replaced by nitrogen; R.sup.2 is a group R.sup.4 or a group of the formula ##STR2## R.sup.4 is cyano, halogen, --OCY.sup.1 F.sub.2, --CY.sup.1 F.sub.2 or an alkyl group in which optionally one >CH--CH C.dbd.C CH--CH C.dbd.C
    • 式(Ⅰ)的光学活性化合物,其中n代表数字0或1; Z 1是单个共价键或-CH 2 CH 2 - ; Z2是单个共价键,-CH 2 CH 2 - , - CH 2 O - , - OCH 2 - , - COO-或-OOC-; 环A1和A2各自独立地表示反式-1,4-亚环己基或任选的卤素,氰基和/或甲基取代的1,4-亚苯基,其中任选地1个CH基团或2个CH基团被氮取代; R 2是基团R 4或式II的基团R 4是氰基,卤素,-OCY 1 F 2,-CY 1 F 2或烷基,其中任选地一个> CH-CH被C = C和/或 任选地一个亚甲基或两个不相邻的亚甲基被-O - , - COO-和/或-OOC-替代,和/或任选地一个亚甲基被-CHY 2 - 取代; Y1是氢或氟; Y2是卤素,氰基或甲基; R 1和R 3表示烷基,其中任选地一个> CH-CH被C = C和/或任选的一个亚甲基或两个不相邻的亚甲基所取代,并被-O-和/或任选的一个或 更多的氢原子被氟取代; 和(S *)和(R *)表示手性碳原子的相对构型,以及含有这些化合物的液晶混合物及其用于光学和电光目的。