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Nematic liquid crystal composition and liquid crystal display device using same

A technology of liquid crystal compositions and compounds, applied in the directions of liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of skin and eye irritation, operating environment problems, destruction of liquid crystal physical properties, etc., and achieve the effect of shortening discharge time and efficient manufacturing

Active Publication Date: 2006-12-06
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of this method on the antistatic structure is easily affected by the amount of ions in the liquid crystal and the alignment film and the orientation state, and a sufficient antistatic effect cannot be obtained in some cases.
In addition, if a large amount is added in order to obtain a sufficient antistatic effect, there is a problem that the nematic-isotropic phase transition temperature of the liquid crystal composition, which is one of the reliability items of the liquid crystal display element, increases with the increase of the addition ratio. (The upper limit temperature of the liquid crystal phase) will be greatly reduced
However, this method has problems in that crown ethers have strong effects such as significant irritation on human skin and eyes, and may cause problems in the working environment in liquid crystal display device manufacturing and the like.
[0007] Furthermore, when the conventional non-liquid crystal compound is added as described above, there are problems such as poor compatibility with the liquid crystal compound and deterioration of liquid crystal properties.
In addition, no additives have been found that can quickly alleviate the abnormal orientation of liquid crystal molecules caused by the application of temporary voltage caused by static electricity and other charges without reducing the resistivity value and display quality.

Method used

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  • Nematic liquid crystal composition and liquid crystal display device using same
  • Nematic liquid crystal composition and liquid crystal display device using same
  • Nematic liquid crystal composition and liquid crystal display device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Hereinafter, the present invention will be described in more detail by citing examples, but the present invention is not limited to these examples. In addition, "%" in the composition of a following Example and a comparative example means "mass %".

[0088] Measured characteristic in the embodiment is as follows:

[0089] T N-I : Nematic-isotropic liquid phase transition temperature (°C)

[0090] Δε: Dielectric constant anisotropy (25°C)

[0091] Δn: birefringence (25°C)

[0092] P: Resistivity value (Ω·cm)

[0093] Charging time: after injecting the liquid crystal composition into the small chamber and using an electrostatic gun to make it illuminated, the time until it returns to the original state without voltage application (seconds)

[0094] Use ellipses as follows in compound descriptions:

[0095] -n (number): -C n h 2n+1 (The alkyl side chain is a number, represented by R)

[0096] -On: -OC n h 2n+1

[0097] -ndm:-(C n h 2n+1 -CH=CH-(CH 2 ) m-1 )...

Embodiment 2

[0125] Table 3 shows the results of preparing the nematic liquid crystal composition (H2) shown below and measuring its physical properties.

[0126] [table 3]

[0127] Liquid crystal composition LC8 (%)

[0128] In the obtained liquid crystal composition H2, the relaxation time of the liquid crystal molecules from the application of the temporary voltage was shorter than that of H1, and the charging time when no measures were taken was about 30 seconds. As Examples 2-1 and 2-2, HIBORON EB-6 (manufactured by BORON INTERNASIONAL Co., Ltd.) which is a charge transfer complex containing a semipolar organoboron compound was added to this H2 to prepare liquid crystal compositions (LC4 and LC5 ). In addition, for comparison, as Comparative Examples 2-1 and 2-2, the same nonionic surfactant tetraethylene glycol dimethyl ether as in Example 1 was added to the nematic liquid crystal composition H2 to prepare a liquid crystal composition (R3 and R4). Table 4 shows the res...

Embodiment 3

[0133] A nematic liquid crystal composition (H3) shown below was prepared, and a liquid crystal composition (LC6) composed of 99.99% of H3 and 0.01% of Emalbon S-83 as a semipolar organoboron compound was prepared. In addition, a liquid crystal composition (LC7) consisting of 99.997% of H3 and 0.003% of T-20 was prepared.

[0134] [table 5]

[0135] Liquid crystal composition H3 (%)

[0136] It was confirmed that the liquid crystal compositions LC6 and LC7 also have the effect of shortening the charging time.

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Abstract

Disclosed is a nematic liquid crystal composition which is characterized by containing one or more kinds of at least one of a semipolar organic boron compound and a charge-transfer complex composed of a semipolar organic boron compound, and by having a resistivity of not less than 1.0 x 10<10> ohm.cm and not more than 1.0 x 10<13> ohm.cm. Also disclosed is a liquid crystal display device using such a nematic liquid crystal composition.

Description

technical field [0001] The present invention relates to a nematic liquid crystal composition and a liquid crystal display element using the composition. Background technique [0002] In the manufacturing process of liquid crystal display elements represented by twisted nematic (Twist Nematic), super twisted nematic (SuperTwist Nematic) or active matrix (active matrix), etc., the protective film attached to the surface of the liquid crystal display element is peeled off. When the film is formed, an electric field due to static electricity (peeling electrification) is generated in the element. The electric field usually aligns the liquid crystal composition in the non-illuminated portion, ie the non-illuminated portion assumes an illuminated state, and this alignment state lasts until the electric field is discharged. The time required until the discharge of the electric field cannot be ignored. Not only in the manufacturing process, but also in the loading process such as th...

Claims

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Application Information

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IPC IPC(8): C09K19/54G02F1/13C09K19/40C09K19/58
CPCC09K19/404C09K19/582C09K19/02C09K19/54G02F1/13
Inventor 赤地洋介栗山毅
Owner DAINIPPON INK & CHEM INC
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