Liquid crystal composition and liquid crystal display element

A liquid crystal composition and compound technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problem of low solubility of the photoactive compound R-1011, achieve improved display quality, excellent low-temperature storage stability, and low temperature little dependent effect

Inactive Publication Date: 2004-07-21
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solubility of the photoactive compound R-1011 is low, and the liquid crystal composition using them has problems in storage stability at low temperature

Method used

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  • Liquid crystal composition and liquid crystal display element
  • Liquid crystal composition and liquid crystal display element
  • Liquid crystal composition and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] 1% of the compound represented by the formula (VI-e) was added to the liquid crystal composition (A), and the temperature characteristic of the pitch was measured. It was 5.2 μm at 0°C, 4.9 μm at 25°C, and 4.8 μm at 50°C. . Thus, the HTP of compound (VI-e) was 19.2 at 0°C, 20.4 at 25°C, and 20.8 at 50°C, and the temperature dependence of the pitch was negative. In addition, the torsion direction of the compound was determined to be right-handed by the contact method. Then, when the compound represented by the formula (VII-h) was measured similarly, the pitch was 11.7 μm at 0°C, 12.3 μm at 25°C, and 13.4 μm at 50°C. Thus, the HTP of compound (VII-h) was 8.5 at 0°C, 8.1 at 25°C, and 7.5 at 50°C, and the temperature dependence of the helical pitch was positive. In addition, it was confirmed by the control method that the twist direction of this compound is right-turned like that of compound (VI-e).

[0189] (Liquid Crystal Composition A)

[0190]

[0191]

[0192...

Embodiment 2

[0205] Add 11.2% of the compound represented by the formula (VI-e) and 4.8% of the compound represented by the formula (VII-h) to the liquid crystal composition (H) to obtain the liquid crystal composition (I). The liquid crystal composition (I) was poured into a tank with a shell thickness of 5 μm, and the selective reflection wavelength was measured to be 558nm at 0°C, 560nm at 25°C, and 560nm at 50°C. Thus ΔW 0-50 0.0072, ΔW 0-25 0.0143, ΔW 25-50 is 0. In addition, this liquid crystal composition (I) also exhibited a chiral nematic phase in the low-temperature storage tests at -20°C, 0°C, and 15°C.

[0206]

Embodiment 3

[0208] Add 8.5% of the compound represented by the formula (VI-e) and 8.5% of the compound represented by the formula (VI-g) to the liquid crystal composition (H) to obtain the liquid crystal composition (J). The liquid crystal composition (J) was poured into a tank with a shell thickness of 5 μm, and the selective reflection wavelength was measured to be 563 nm at 0°C, 561 nm at 25°C, and 561 nm at 50°C. Thus ΔW 0-50 -0.0071, ΔW 0-25 -0.0142, ΔW 25-50 is 0. In addition, this liquid crystal composition (J) also showed a chiral nematic phase in the low-temperature storage test at -20°C, 0°C, and 15°C.

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Abstract

A chiral nematic liquid crystal composition has minimal temperature dependency of the natural pitch and temperature dependency of the wavelength selective reflection and low temperature storage stability thereof is excellent. A chiral nematic liquid crystal composition with a broad liquid crystal temperature range is used in a bistable liquid crystal display element, and a bistable liquid crystal display element comprising the liquid crystal composition. The chiral nematic liquid crystal composition comprises optically active compounds represented by general formula (I-a) and general formula (II-a) wherein the general formula (II-a) has the same helical twisting direction as the general formula (I-a), and shows a positive temperature dependency for the natural pitch, and a HTP value of at least 3.

Description

technical field [0001] The present invention relates to a chiral nematic liquid crystal composition having a small temperature dependence of a natural pitch and a selective reflection wavelength in a bistable liquid crystal display element and excellent low-temperature storage stability, and a liquid crystal display element using the same. Background technique [0002] It is known that in order to induce twist orientation in a bistable liquid crystal display element, a chiral nematic liquid crystal display composition to which a photoactive compound having a liquid crystal skeleton is added is used, wherein if the content C (mass %) of the photoactive compound is increased , the natural pitch P (μm) becomes smaller, or within the content range of about tens of mass %, the relationship that the product of P and C is constant can be well established. Therefore, the helical torsion force: HTP (1 / μm) is defined by [0003] HIP=1 / (P×0.01C) [0004] (wherein, C (mass %) represen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/14C09K19/20C09K19/58
CPCC09K19/586C09K19/2028C09K2323/00C09K19/14
Inventor 中田秀俊竹内清文
Owner DAINIPPON INK & CHEM INC
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