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1st Edition
Contents:
  1. Liquid Crystals Today: Vol 22, No 4
  2. Product details
  3. Recommended for you
  4. Nematic Liquid Crystals

Such a cell structure having base plates and a as shown in FIG. Next, a process for producing the liquid crystal device according to the present invention by orientation-controlling the liquid crystal layer is explained more specifically, with reference to FIG. First, a cell containing a liquid crystal according to the present invention is set in such a heating case not shown that the whole cell is uniformly heated therein.

Then, the cell is heated to a temperature where the liquid crystal in the cell assumes as isotropic phase. The temperature of the heating case is decreased, whereby the liquid crystal composition is subjected to a temperature decreasing stage. In the temperature decreasing stage, the liquid crystal composition in the isotropic phase is transformed into SmA either directly or through a cholesteric phase having a grandjean texture. Herein, the axes of the liquid crystal molecules in the SmA phase are aligned in the rubbing direction.

Reference numerals 42 and 43 respectively denote a group of scanning electrodes to which scanning signals are applied and a group of signal electrodes to which information signals are applied. Referring to FIGS. On the other hand, FIGS. In FIGS. For instance, when displaying a motion picture, the group of scanning electrodes 42 are sequentially and periodically selected.

If a threshold voltage for giving a first stable state of the liquid crystal having bistability is referred to as V th1 and a threshold voltage for giving a second stable state thereof as -V th2 , an electric signal applied to the selected scanning electrode 42 s is an alternating voltage showing V at a phase time t 1 and -V at a phase time t 2 , as shown in FIG. The other scanning electrodes 42 n are grounded as shown in FIG. Accordingly, the electric signals appearing thereon show zero volt. On the other hand, an electric signal applied to the selected signal electrode 43 s shows V as indicated in FIG.

Liquid Crystals Today: Vol 22, No 4

Voltage waveforms applied to each picture element when such electric signals are given are shown in FIG. Waveforms shown in FIGS. Namely, as seen from FIG. Further, a voltage of -2 V above the threshold level -V th2 is applied to the ferroelectric liquid crystal electrically connected to the picture elements B on the same scanning line at a phase of t 1.

Accordingly, depending upon whether a signal electrode is selected or not on a selected scanning electrode line, the orientation of liquid crystal molecules changes. Namely, when a certain signal electrode is selected, the liquid crystal molecules are oriented to the first stable state, while when not selected, are oriented to the second stable state. In either case, the orientation of the liquid crystal molecules is not related to the previous states of each picture element. Accordingly, the ferroelectric liquid crystal molecules electrically connected to the respective picture elements C and D are placed in the orientations corresponding to signal states produced when they have been last scanned without change in orientation.

Namely, when a certain scanning electrode is selected, signals corresponding to one line are written and thus writing of signals corresponding to one frame is completed. The signal state of each picture element can be maintained until the line is subsequently selected. Accordingly, even if the number of scanning lines increases, the duty ratio does not substantially change, resulting in no possibility of lowering in contrast, occurrence of crosstalk, etc.

In this way, the electric signals applied to a selected scanning electrode can cause either direction of change in state, i. Compared with a case where a liquid crystal showing a chiral smectic phase such as DOBAMBC, HOBACPC, or MBRA 8 is used alone, the liquid crystal composition used in the present invention containing a liquid crystal showing a cholesteric phase has a better orientation characteristic and gives an orientation or alignment state free of orientation defects. On a square glass base plate were formed ITO Indium-Tin-Oxide electrode films in the form of stripes with a width of In an apparatus for the oblique vapor deposition as shown in FIG.

On the other hand, on a similar glass plate provided with stripe-form ITO electrode films was applied a polyimide-forming solution "PIQ": polyimide-isoindolquinazoline-dione, produced by Hitachi Kasei Kogyo K. Then, a heat-setting epoxy adhesive was applied to the periphery of the A electrode plate except for the portion forming an injection port by screen printing process. Separately, a liquid crystal composition was prepared by mixing 5 parts by weight of cholesteryl nonanate with parts by weight of p-decyloxy-benzylidene-p'-aminomethylbutyl cinnamate DOBAMBC.

The liquid crystal composition was heated into the isotropic phase and injected through the injection port of the above-prepared cell, and the injection port was sealed. The liquid crystal cell thus formed was gradually cooled at a rate of 0. A similar electrode plate provided with a polyimide film was subjected to a rubbing treatment to produce a B electrode plate.

Separately, a liquid crystal composition was prepared by mixing 10 parts by weight of 4- 2-methylbutyl phenyl-4'-decyloxybenzoate with parts by weight of DOBAMBC.

Product details

The liquid crystal composition was heated into the isotropic phase and injected through the infection port of the above-prepared cell, and the infection port was sealed. Separately, a liquid crystal composition was prepared by mixing 8 parts by weight of 4-hexyloxyphenyl 2"-methylbutyl biphenyl-4'-carboxylate with parts by weight of DOBAMBC. The liquid crystal composition was heated into the isotropic phase and infected through the injection port of the above-prepared cell, and the injection port was sealed.

Separately, a liquid crystal composition was prepared by mixing 5 parts by weight of 4-heptylphenyl 4"-methylhexyl biphenyl-4'-carboxylate with parts by weight of DOBAMBC. The liquid crystal composition was heated into the isotropic phase and infected through the infection port of the above-provided cell, and the injection port was sealed. Separately, a liquid crystal composition was prepared by mixing 5 parts by weight of cholesteryl nonanate with parts by weight of 4-hexyloxyphenyl 2"-methylbutyl biphenyl-4'-carboxylate.

The liquid crystal composition was heated into the isotropic phase and injected through the injection port of the above-provided cell, and the injection port was sealed. On the other hand, as a comparative experiment, a liquid crystal device was prepared in the same manner as described above except that the cholesteryl nonanate was omitted. The liquid crystal device was subjected to similar microscopic observation. Separately, a liquid crystal composition was prepared by mixing 10 parts by weight of 4- 2-methylbutyl phenyl-4'-decyloxybenzoate with parts by weight of 4-octyloxyphenyl 2"-methylbutyl biphenyl-4'-carboxylate.

The liquid crystal composition was heated into the isotropic phase and injected through the injection port of the above provided cell, and the injection port was sealed.


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On the other hand, as a comparative experiment, a liquid crystal device was prepared in the same manner as described above except that the 4- 2-methylbutyl -phenyl-4'-decyloxybenzoate was omitted. Liquid crystal devices were prepared in the same manner as in Example 6 except that the 4- 2-methyl-butyl phenyl-4'-decyloxybenzoate was replaced by 4- 2"-methylbutyl 4'-cyanobiphenyl Example 7 , cholesteryl benzoate Example 8 and 4- 2"-methylbutyloxy 4'-cyanobiphenyl Example 9 , respectively.

Recommended for you

Separately, a liquid crystal composition was prepared by mixing 4 parts by weight of 4- 2-methyl-butyl -4'-hexyloxyazobenzene with parts by weight of 4-hexyloxyphenyl 2"-methylbutyl biphenyl-4'-carboxylate. The liquid crystal composition was heated into the isotropic phase and injected through the injection port and into the above-provided cell under vacuum, and the injection port was sealed.

On the other hand, as a comparative experiment, a liquid crystal device was prepared in the same manner as described above except that the 4- 2-methylbutyl -4'-hexyloxyazobenzene was omitted. A glass plate, on which stripes of ITO electrode film were provided in a width of Separately, a liquid crystal composition was prepared by mixing 4 parts by weight of 4-cyanobenzylidene-4'- 2-methylbutyl aniline with parts by weight of 4-octyloxyphenyl 2"-methylbutyl biphenyl-4'-carboxylate.

On the other hand, as a comparative experiment, a liquid crystal device was prepared in the same manner as described above except that the 4-cyanobenzylidene-4'- 2-methylbutyl aniline was omitted. Separately, a liquid crystal composition was prepared by mixing 5 parts by weight of cholesteric nonanate with parts by weight of 4- 2'-methylbutyl -phenyl-4'-octyloxybiphenylcarboxylate. Separately, a liquid crystal composition was prepared by mixing 10 parts by weight of 4- 2-methylbutyl phenyl-4'-decyloxybenzoate with 4- 2'-methylbutyl phenyl-4'-octyloxybiphenylcarboxylate.

The liquid crystal composition was heated into the isotropic phase and injected through the injection port and into the above-provided cell, and the injection port was sealed. Liquid crystal devices were prepared in the same manner as in Example 13 except that the 4- 2'-methylbutyl phenyl-4'-octyloxybiphenylcarboxylate was replaced by 4-pentylphenyl 4'-methylhexyl phenyl-4'-carboxylate Example 14 , and p-n-octyloxybenzoic acid-p'- 2-methylbutyloxy phenyl ester Example 15 , respectively.

Liquid crystal devices were prepared in the same manner as in Example 13 except that the 4- 2-methylbutyl phenyl-4'-decyloxybenzoate was replaced by 4- 2"-methylbutyl -4'-cyanobiphenyl Example 16 , cholesteryl benzoate Example 17 and 4- 2'-methylbutyloxy -4'-cyanobiphenyl Example 18 , respectively. Separately, a liquid crystal composition was prepared by mixing 4 parts by weight of 4- 2-methylbutyl -4'-hexyloxyazobenzene with parts by weight 4- 2'-methylbutyl phenyl-4'-octyloxybiphenylcarboxylate.

Liquid crystal devices were prepared in the same manner as in Example 19 except that the 4- 2-methylbutyl -4'-hexyloxyazobenzene was replaced y 4- 2"-methylbutyl -4'-cyanobiphenyl Example 20 , cholesteryl benzoate Example 21 and 4- 2"-methylbutyloxy -4'-cyanobiphenyl Example 22 , respectively. Separately, a liquid crystal composition was prepared by mixing 75 parts by weight of 4-hexyloxy-phenyl 2"-methylbutyl biphenyl-4'-carboxylate with parts by weight of 4- 2'-methylbutyl phenyl-4'-octyloxybiphenylcarboxylate. On the other hand, as comparative experiments, liquid crystal devices were prepared in the same manner as described above except that the two liquid crystals used in the above liquid crystal device were separately used.

The liquid crystal devices were subjected to similar microscopic observation. Further, when 20 parts by weight of DOBAMBC was added to parts by weight of the above-mentioned liquid crystal composition to obtain a liquid crystal composition. The thus obtained liquid crystal composition was used to prepare a liquid crystal device in the same manner.

Separately, a liquid crystal composition was prepared by mixing 70 parts by weight of 4- octyloxyphenyl 2"-methylbutyl biphenyl-4'-carboxylate with parts by weight of 4-pentylphenyl- 4"-methylhexyl biphenyl-4'-carboxylate. The thus obtained a liquid crystal composition was used to prepare a liquid crystal device in the same manner. Liquid crystal devices were prepared in the same manner as in Example 23 except that the 4- 2-methylbutyl phenyl-4'-octyloxybiphenylcarboxylate was replaced by 4-pentylphenyl 4"-methylhexyl -biphenyl-4'-carboxylate Example 25 , and p-n-octyloxybenzoic acid-p'- 2-methylbutyloxy phenyl-ester Example Separately, a liquid crystal composition was prepared by mixing 80 parts by weight of 4-hexyloxy-phenyl 2"-methylbutyl biphenyl-4'-carboxylate with parts by weight of 4- 2'-methylbutyl phenyl-4'-octyloxybiphenylcarboxylate.

Further, when 20 parts by weight of OOBAMBCC was added to parts by weight of the above-mentioned liquid crystal composition to obtain a liquid crystal composition. Liquid crystal devices were prepared in the same manner as in Example 27 except that the 4- 2'-methylbutyl phenyl-4'-octyloxybiphenylcarboxylate was replaced by 4-pentylphenyl 4"-methylhexyl biphenyl-4'-carboxylate Example 28 and p-n-octyloxybenzoic acid-p'- 2-methylbutyloxy phenyl ester. Liquid crystal devices were prepared in the same manner as in Example 24 except that the 4-pentylphenyl 4"-methylhexyl biphenyl-4'-carboxylate used in Example 24 was replaced by 4- 2'-methylbutyl phenyl-4'-octyloxybiphenylcarboxylate Example 30 and p-n-octyloxybenzoic acid-p'- 2-methylbutyloxy phenyl ester.

The liquid crystal devices produced in the above examples were driven for wiring with voltage signals having waveforms as shown in FIG. Year of fee payment : 4. Year of fee payment : 8.

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Nematic Liquid Crystals

Year of fee payment : Shown in a is CS hydrogel. Previous work has demonstrated that many biological systems exist as ordered, liquid-crystalline materials [ 27 ]. The SEM images further indicated that the dispersed LC domains formed island-like structures in the matrix. The soft matter nature of hydrogel and the characteristic of LC combined in the composite might facilitate initial cell adhesion and remain prolonged cell viability. It was well known that CS had a chemical structure similar to human body molecules-glycosaminoglycans [ 3 ] and CS hydrogel possessed the property of soft matter favoring cell attachment and growth.

Furthermore, blending of hydrophobic LC into hydrophilic CS might generate optimum hydrophilic—hydrophobic balance leading to a positive role for cell attachment and growth [ 30 ]. In addition, the mechanical strength of the composite hydrogel, especially the elasticity of this type of soft matter, might further offer a better condition for cell adhesion on the substrate surface.

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