Liquid crystal cells – elements and systems – Liquid crystal system
Reexamination Certificate
2001-09-25
2003-10-14
Chowdhury, Tarifur R. (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal system
C349S182000, C252S299010, C252S299500, C428S001100
Reexamination Certificate
active
06633348
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2000-291905 filed Sep. 26, 2000, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal composition, a liquid crystal display and a method of manufacturing the liquid crystal display.
2. Description of the Related Art
At present, a general liquid crystal display is manufactured in the following procedure. First, an electrode and an alignment film are successively formed on each of a pair of glass substrates having switching elements, a color filter layer, and the like. Subsequently, these glass substrates are disposed at a constant distance so that the alignment films are disposed opposite to each other, peripheries of the glass substrates excluding a liquid crystal sealing port are fixed with an adhesive, and a liquid crystal cell is formed. Additionally, a gap between the glass substrates is maintained to be constant by spacers. Thereafter, the gap between the liquid crystal cell is filled with a liquid crystal composition to form a liquid crystal layer, and the liquid crystal sealing port is sealed with a sealing material so that the liquid crystal display is obtained.
For the liquid crystal display manufactured by this method, when the liquid crystal layer is contaminated with an impurity, a display property is largely influenced. However, the contamination with the impurity cannot be avoided in the conventional liquid crystal display. Therefore, the conventional liquid crystal display has a problem that display unevenness occurs and reliability is deteriorated.
BRIEF SUMMARY OF THE INVENTION
According to a first aspect of the present invention, there is provided a liquid crystal display comprising a first substrate, a second substrate facing the first substrate, and a liquid crystal layer intervening between the first and second substrates and containing liquid crystal substances different from each other, a sum of values each calculated from a formula:
X
&agr;
(
RTlogP
&agr;
+HE
&agr;
)
for all the liquid crystal substances in the liquid crystal layer being 32 kJ/mol or higher, wherein X
&agr;
denotes a molar fraction of a component &agr; in the liquid crystal layer, P
&agr;
denotes a distribution ratio of the component &agr; between an aqueous phase and a 1-octanol phase, HE
&agr;
denotes a hydration energy for 1 mol of the component &agr;, R denotes a gas constant of 8.3 J/K·mol, and T denotes a temperature of 300 K.
According to a second aspect of the present invention, there is provided a method of manufacturing a liquid crystal display, the display comprising a pair of substrates and a liquid crystal layer intervening between the substrates and containing liquid crystal substances different from each other, comprising determining a composition of the liquid crystal layer based on a sum of values each calculated from a formula:
X
&agr;
(
RTlogP
&agr;
+HE
&agr;
)
for all the liquid crystal substances in the liquid crystal layer, wherein X
&agr;
denotes a molar fraction of a component &agr; in the liquid crystal layer, P
&agr;
denotes a distribution ratio of the component &agr;, HE
&agr;
denotes a hydration energy for 1 mol of the component &agr;, R denotes a gas constant, and T denotes a temperature, and forming a structure comprising the liquid crystal layer intervening between the substrates and having the composition determined.
According to a third aspect of the present invention, there is provided a liquid crystal composition comprising liquid crystal substances different from each other, a sum of values each calculated from a formula:
X
&agr;
(
RTlogP
&agr;
+HE
&agr;
)
for all the liquid crystal substances being 32 kJ/mol or higher, wherein X
&agr;
denotes a molar fraction of one component &agr; of the liquid crystal substances in the composition, P
&agr;
denotes a distribution ratio of the component &agr; between an aqueous phase and a 1-octanol phase, HE
&agr;
denotes a hydration energy for 1 mol of the component &agr;, R denotes a gas constant of 8.3 J/K·mol, and T denotes a temperature of 300 K.
REFERENCES:
patent: 4892926 (1990-01-01), Suenaga et al.
patent: 4992201 (1991-02-01), Pearlman
patent: 5238599 (1993-08-01), Obikawa et al.
patent: 5698134 (1997-12-01), Jubb et al.
Fukuoka Nobuko
Maya Natsuko
Naito Katsuyuki
Shohara Kiyoshi
Yamamoto Takeshi
Chowdhury Tarifur R.
Kabushiki Kaisha Toshiba
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