公开(公告)号：US6007737A

公开(公告)日：1999-12-28

申请号：US952732

申请日：1997-11-25

申请人： Shinichi Nishiyama ,  Yuichirou Tatsuki ,  Takahiro Fujiyama ,  Chiho Hirano ,  Hideo Hama ,  Tohru Yamanaka

发明人： Shinichi Nishiyama ,  Yuichirou Tatsuki ,  Takahiro Fujiyama ,  Chiho Hirano ,  Hideo Hama ,  Tohru Yamanaka

IPC分类号： C09K19/02 ,  C09K19/52 ,  C09K19/20 ,  C09K19/32

CPC分类号： C09K19/0266 ,  C09K19/0225

摘要： The first smectic liquid crystal composition of the invention has a voltage gradation parameter L of less than 0.6, said parameter being defined by the equation L=S.sub.H /S.sub.O with the proviso that: a liquid crystal cell filled with a liquid crystal composition is placed between a pair of polarizing plates arranged in the crossed Nicols state; a voltage is applied to the liquid crystal cell to form a hysteresis curve showing a correlation between the voltage and a transmittance; and a tangent line I.sub.R of the hysteresis curve within a region wherein the transmittance steeply increases intersects a tangent line I.sub.F of the hysteresis curve within a region which is adjacent to the voltage-steep increase region and which is on the higher-voltage side at an intersection point P. In the above equation, S.sub.O is an area of a rectangular triangle having as an oblique side a straight line PQ which has, as both ends, the intersection point P and an intersection point Q of an axis of ordinate (V=0) and the hysteresis curve; and S.sub.H is an area of a region enclosed with the straight line PQ, the hysteresis curve and a constant-voltage straight line which passes the intersection point P. The second liquid crystal composition of the invention has a parameter G of 0 to 0.3, said parameter G being defined by the following equation with the proviso that when an absolute value .vertline.V.vertline. of a voltage V applied in the same manner as described above is increased to the predetermined value .vertline.V.vertline..sub.min, the light quantity T becomes a maximum value T.sub.max ; ##EQU1## In the above equation, S is an area of a region enclosed with the hysteresis curve, T.sub.min is a minimum value of the transmittance; and T.sub.0 is a transmittance given when no voltage is applied.

摘要翻译： PCT No.PCT / JP96 / 01478。 371日期：1997年11月25日 102（e）1997年11月25日日期PCT提交1996年5月31日PCT公布。 公开号WO96 / 38513 日本1996年12月5日本发明的第一层间液晶组合物具有小于0.6的电压等级参数L，所述参数由式L = SH / SO定义，条件是：填充有液体的液晶单元 将晶体组成放置在以正交尼科尔斯状态布置的一对偏振板之间; 向液晶单元施加电压，形成表示电压与透射率的相关性的滞后曲线。 并且在透射率急剧增加的区域内的滞后曲线的切线IR与滞后曲线的切线IF在与电压陡峭增加区域相邻的区域内相交，并且位于高电压侧的区域 在上述等式中，SO是具有倾斜侧的直线PQ的矩形三角形的区域，该直线PQ的两端具有交点P和纵轴的交点Q（V = 0）和滞后曲线; SH是通过交点P的直线PQ，滞后曲线和恒定电压直线所包围的区域的区域。本发明的第二液晶组合物的参数G为0〜0.3，所述 参数G由以下等式定义，条件是当绝对值| V |时 以与上述相同的方式施加的电压V增加到预定值| V | min，光量T变为最大值Tmax; 在上述等式中，S是用滞后曲线包围的区域的面积，Tmin是透射率的最小值; 而T0是当没有施加电压时给出的透射率。