摘要
在胆甾相液晶中掺入少量的单体材料分别制备了常白和常黑模式
PSCTLC。本文从研究液晶中形成的聚合物网络的形貌和排列特性出发，对
两种模式PSCTLC的电光特性进行了系统地研究和优化。很好地改善了困
扰PSCTLC实现灰度显示和多路驱动的迟滞效应，有效的降低了器件的驱
动电压，解决了与寻址TFT和驱动IC的电压匹配问题。
首先使用偏光显微镜和电子扫描显微镜研究了在液晶中形成的聚合物
网络织构的形貌，并考察了聚合光强和聚合温度对网络结构的影响。
在分析了胆甾液晶中的织构转变过程的基础上，对NW千SCTLC的电光
特性进行了系统研究。从理论和实验两个方面对聚合物网络结构进行了分
析和优化，提出了增大聚合物浓度并在较弱的紫外光强（I＝0．05mw／m~2左
右）条件下进行光聚合，可以很好地改善NW－PSCTLC 的迟滞效应，同时使
器件保持较好的对比度特性。通过对d/p的优化，使器件的饱和驱动电压
降低到5伏，并首次制作出PSCTLC动态数码显示样机。论文中还提出一
种准确定量评价NW－PSCTLC灰度能力的方法，使用此方法可以准确计算出
PSCTLC器件可实现的最大灰度级。
在NB－PSCTLC的研究过程中，利用NS－PSCTLC光阀的暗态光透过率随
波长的依赖特性，配合普通CCD摄相器，发明了一种通过使高／低物体图
像分离实现火灾监控的装置。
论文最后分析了NB－PSCTLC中迟滞效应产生的机理，提出了一个多畴
模型，很好地解释了聚合物对迟滞的影响。选用7μm的薄盒，通过对制备
条件的优化，增强了迟滞宽度，在很低的偏压V_3.3伏）作用下实现了稳
定的双稳。文中给出了一种合理的偏压驱动方案，用无源矩阵就可以实现
大容量信息显示。
NW/NB--PSCTLC has been prepared by doping a sma11 amount of
diacry1ate monomer in cho1esteric 1 iquid crysta1 s. E1ectroopt i c
properties of NW/NB--PSCTLC has been systematica11y studied and
optimized on the basi 5 of investigation of morpho1ogy and a1ignment
of po1ymer network formed in 1 iqui d crysta1 s. The hysteresi s effects,
whi ch strong1y deteri orate gray--sca1 e capac ity and mu1t ip1exing of
PSCTLC, were significant1y improved. The driving vo1tage of PSCTLC
was significant1y reduced to match with addressing TFT and driving
IC.
First, the morpho1ogy and texture of po1ymer networks formed
in 1 iquid crysta1s were studied by using po1arized microscope and
SEM. Effects of curing temperature and UV intens1ty on po1ymer
network were a1 so investi gated.
0n the base of ana1ysis of the process textlure transition of
cho1esteric 1iquid crysta1s, I studied e1ectrooDtic properties of
NW--PSCTLC systemat1ca11y. The structure of po1ymer networks was
optimized in theory as we1l as in experiment. The hysteresis effects
were improved satisfactori1y whi1e devices kept good contrast
performance. The saturation vo1tage was reduced to about 5 vo1ts by
optlmizing of d/P of devices. A method for quantlfied eva1uating the
gray sca1es of NW--PSCTLC correct1y was given in thi s di ssertation.
Using thi s method the maximum gray sca1es of devices with hysteresi s
can be ca1cu1ated eas i1y. A NW--PSCTLC dynami c digi ta1 di sp1ay samp1e
driven with duty of 1/8 has been prepared for the first time in China.
During the study of NB--PSCTLC, A fire--watching device was
invented on the basis of dependence of transmittance at off state
on wave1ength of NB--PSCTLC and cooperated with CCD camera.
The mechanism coursing hysteresis effect in NB--PSCTLC was
ana1yzed in the 1ast ehapter of this dissertation. A mu1ti--domain
mode1, which explained the effects of po1ymer, network on hysteresis
we11. The hysteresis width was enhanced by optimi zing of fabricating
conditions. Stab1e' bi stabi1ity can be rea1ized under very 1ow
bias--vo1tages with thin ce11s of 7op. A bias driving--scheme was
i11ustrated. NB--PSCTLC can be used to make high definition disp1ay
on a passive matrix.
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