Liquid crystal composition and liquid crystal display device using liquid crystal composition

Abstract

To provide: a liquid crystal composition having a lower rotational viscosity than conventional liquid crystal compositions; and a liquid crystal display device.SOLUTION: A liquid crystal composition having a dielectric anisotropy of -2.0 to -3.9 at 25°C at least contains 5-50% of a first composition and 40-80% of a second composition. The first composition contains one or more kinds of compounds represented by structural formulas (1-1) and (1-2), where R1 represents an alkyl group (C=1-5) or an alkenyl group (C=2-5), and R2 represents an alkyl group (C=1-4) or an alkenyl group (C=2-4). The second composition contains one or more compounds having, e.g., the structural formulas shown below.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid crystal composition having negative dielectric anisotropy and a liquid crystal display device using the liquid crystal composition. [Background technology]

[0002] Liquid crystal display devices are now used in automotive panels, word processors, electronic organizers, printers, computers, mobile phones, televisions, advertising displays, and more. Representative liquid crystal display modes include TN (twisted nematic), STN (super twisted nematic), MVA (multi-domain vertical alignment) using TFT (thin film transistor), PSA (polymer sustained alignment), IPS (in-plane switching), and FFS (fringe field switching). Liquid crystal compositions used in these display devices must be stable to external factors such as moisture, air, heat, and light, exhibit a liquid crystal phase over as wide a temperature range as possible centered around room temperature, and have low viscosity. Furthermore, liquid crystal compositions are composed of several to approximately twenty types of compounds, as shown in Patent Document 1 below, to achieve the required values ​​of dielectric anisotropy (Δε) or refractive index anisotropy (Δn) for each display device.

[0003] In recent years, there has been a particular demand for liquid crystal compositions with fast response times. While various methods are available for achieving the desired physical properties, one effective method is to reduce the viscosity of the liquid crystal composition. Adding a compound with low viscosity (η) is extremely effective for reducing the viscosity of a liquid crystal composition. Adding a compound with low rotational viscosity (γ1) is particularly effective. However, most conventional compounds with very low viscosity are nonpolar compounds with a dielectric anisotropy near zero, and using too much of these compounds reduces the dielectric anisotropy. Therefore, it has been difficult to use too many of them to achieve the desired dielectric anisotropy. This has been a challenge, particularly when preparing low-viscosity, negative dielectric anisotropy liquid crystal compositions.

[0004] Therefore, in order to further improve the liquid crystal properties, there is a need to develop a low-viscosity liquid crystal composition having the desired negative dielectric anisotropy by using a compound with a relatively low viscosity and a strong negative dielectric anisotropy and a large amount of a low-viscosity non-polar compound. Patent Document 2 below shows a compound with a strong negative dielectric anisotropy developed for the same purpose, but this compound has the drawback of being insufficiently compatible with conventional liquid crystal compounds and being difficult to increase in content, and therefore does not fully achieve the required cutting-edge properties.

[0005] Furthermore, Patent Document 3 is a prior art related to the present invention, but it does not describe at all the liquid crystal compositions using the compounds used in the present invention or the properties thereof. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-99038 [Patent Document 2] Patent No. 7297269 [Patent Document 3] Patent No. 4562827 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a liquid crystal composition designed to have a low rotational viscosity using a selected compound that has a strong negative dielectric anisotropy, a relatively low viscosity, and excellent compatibility with other liquid crystal compounds, and a liquid crystal display element using the liquid crystal composition. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a liquid crystal composition that includes at least a first composition and a second composition different from the first composition, and that exhibits a predetermined dielectric anisotropy, wherein the first composition includes one or more compounds represented by the following structural formula (1-1) and structural formula (1-2):

[0009] [ka] (In the formula, R 1 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, R 2 represents an alkyl group having 1 to 4 carbon atoms or an alkenyl group having 2 to 4 carbon atoms. The second composition contains one or more compounds represented by the following structural formulas (2-1) to (2-6): [ka] (In the formula, R 3 represents an alkyl group having 1 to 9 carbon atoms or an alkenyl group having 2 to 9 carbon atoms, and R 4 represents an alkyl group or an alkoxy group having 1 to 9 carbon atoms, or an alkenyl group having 3 to 9 carbon atoms.) The present invention provides a liquid crystal composition in which the content of the first composition is 5% to 50%, the content of the second composition is 40% to 80%, and the dielectric anisotropy at 25°C is -2.0 to -3.9.

[0010] Furthermore, the liquid crystal composition according to the present invention preferably further contains a UV-curable monomer in a proportion of 0.2% to 0.5%, depending on the liquid crystal display device in which it is used.

[0011] Furthermore, there is provided a liquid crystal display element using the liquid crystal composition of the present invention. The liquid crystal display element of the present invention is preferably an MVA type, a PSA type, an IPS type, or an FFS type. [Effects of the Invention]

[0012] The liquid crystal composition of the present invention has a strong negative dielectric anisotropy and excellent compatibility with other liquid crystal compounds, and by using a compound exhibiting a relatively low rotational viscosity and a compound having a low rotational viscosity with a dielectric anisotropy of around 0 in a larger amount, the required dielectric anisotropy and low rotational viscosity of the liquid crystal composition are achieved. Liquid crystal display elements using the liquid crystal composition of the present invention are particularly suitable for providing liquid crystal display elements for liquid crystal televisions and liquid crystal monitors, which require high-speed response. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will be described in detail below, but is not limited thereto. The liquid crystal composition of the present invention includes at least a first composition and a second composition different from the first composition, and may or may not contain substances other than the first and second compositions. The first composition includes one or more compounds represented by structural formula (1-1) and structural formula (1-2). That is, the first composition may include only structural formula (1-1), only structural formula (1-2), or both structural formula (1-1) and structural formula (1-2). The content of the first composition in the entire liquid crystal composition is 5% to 50%. The second composition preferably includes one or more liquid crystal compounds represented by structural formula (2-1) to structural formula (2-6) above, each having a dielectric anisotropy (hereinafter simply referred to as "Δε") of approximately 0 (generally -2 to +2). In this case, the content of the second composition in the entire liquid crystal composition is preferably 40% to 80%. Furthermore, the liquid crystal composition of the present invention preferably contains 50% to 80% of the second composition (i.e., a composition containing one or more liquid crystal compounds of structural formulas (2-1) to (2-6)). Furthermore, the liquid crystal composition of the present invention preferably contains 60% to 80% of the second composition (i.e., a composition containing one or more liquid crystal compounds of structural formulas (2-1) to (2-6)), since this achieves a low rotational viscosity. Note that, in the second composition, one structural formula from structural formulas (2-1) to (2-6) may be used, or two or more structural formulas may be selected and used.

[0014] Furthermore, when the first composition contains a compound of structural formula (1-1), the compound of structural formula (1-1) preferably contains one or more of the compounds represented by the following structural formulas (1-1-1), (1-1-2), (1-1-3), and (1-1-4). When the first composition contains a compound of structural formula (1-2), the compound of structural formula (1-2) preferably contains one or more of the compounds represented by the following structural formulas (1-2-1), (1-2-2), (1-2-3), and (1-2-4). Note that, in the compound of structural formula (1-1), one structural formula from structural formula (1-1-1) to structural formula (1-1-4) may be used, or two or more structural formulas may be selected and used. In the compound of the structural formula (1-2), one structural formula may be used from the structural formulas (1-2-1) to (1-2-4), or two or more structural formulas may be selected and used. [ka]

[0015] In addition, R in structural formula (2-1) to structural formula (2-6) 3 represents an ethyl group, a propyl group, an ethenyl group, or a propenyl group, and R 4 preferably represents an alkyl or alkoxy group having 1 to 5 carbon atoms.

[0016] Furthermore, when the second composition contains a liquid crystal compound of structural formula (2-1), the liquid crystal compound of structural formula (2-1) contains one or more compounds represented by the following structural formulas (2-1-1), (2-1-2), (2-1-3), (2-1-4), and (2-1-5); when the second composition contains a liquid crystal compound of structural formula (2-2), the liquid crystal compound of structural formula (2-2) contains one or more compounds represented by structural formulas (2-2-1) and (2-2-2); and when the second composition contains a liquid crystal compound of structural formula (2-3), the liquid crystal compound of structural formula (2-3) contains one or more compounds represented by structural formulas (2-3-1) and (2-3-2). It is more preferable that the second composition contains one or more of the compounds represented by structural formula (2-4), and when the second composition contains a liquid crystal compound represented by structural formula (2-4), the liquid crystal compound represented by structural formula (2-4) contains one or more of the compounds represented by structural formula (2-4-1), structural formula (2-4-2), structural formula (2-4-3), and structural formula (2-4-4); when the second composition contains a liquid crystal compound represented by structural formula (2-5), the liquid crystal compound represented by structural formula (2-5) contains a compound represented by structural formula (2-5-1); and when the second composition contains a liquid crystal compound represented by structural formula (2-6), the liquid crystal compound represented by structural formula (2-6) contains one or more of the compounds represented by structural formula (2-6-1) and structural formula (2-6-2). In addition, for compounds of structural formula (2-1), one structural formula from structural formula (2-1-1) to structural formula (2-1-5) may be used, or two or more structural formulas may be selected and used. For compounds of structural formula (2-2), one structural formula from structural formula (2-2-1) to structural formula (2-2-2) may be used, or two or more structural formulas may be selected and used. For compounds of structural formula (2-3), one structural formula from structural formula (2-3-1) to structural formula (2-3-2) may be used, or two or more structural formulas may be selected and used. For compounds of structural formula (2-4), one structural formula from structural formula (2-4-1) to structural formula (2-4-4) may be used, or two or more structural formulas may be selected and used.In the compound of the structural formula (2-6), one of the structural formulas (2-6-1) to (2-6-2) may be used, or two or more structural formulas may be selected and used. [ka] JPEG2025171089000005.jpg29113

[0017] Furthermore, it is more preferable that the liquid crystal composition of the present invention contains 31% to 50% of the first composition (i.e., a composition containing one or more compounds represented by structural formula (1-1) and structural formula (1-2)).

[0018] The liquid crystal composition of the present invention may further comprise a third composition different from both the first and second compositions. Examples of preferred conventional liquid crystal compounds having a negative Δε greater than -3 and contained in the liquid crystal composition of the present invention include those represented by the following structural formulae (3-1) to (3-6). The third composition preferably contains one or more of these compounds. [ka] (In the formula, R 5 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, R 6 represents an alkyl group having 1 to 5 carbon atoms, and more preferably, R 5 represents an ethyl group, a propyl group, an ethenyl group, or a propenyl group, and R 6 represents a methyl group or an ethyl group.

[0019] The liquid crystal composition of the present invention may further contain a fourth composition different from any of the first, second, and third compositions. Examples of preferred conventional liquid crystal compounds having a negative Δε of approximately −2 that may be contained in the liquid crystal composition of the present invention include those represented by the following structural formulas (4-1-1) and (4-1-2). It is preferred that the fourth composition contains one or two of these compounds. [ka]

[0020] The liquid crystal display element using the liquid crystal composition of the present invention is preferably an MVA type, a PSA type, an IPS type, or an FFS type. In particular, the vertical alignment type MVA type and PSA type, in which a liquid crystal material is sandwiched between two substrates, the liquid crystal is aligned approximately perpendicular to the substrates, and an electric field approximately perpendicular to the substrates is applied to use the liquid crystal as an optical element or a display element, are preferred, as are the IPS type and FFS type, in which the liquid crystal is aligned approximately parallel to the substrates and approximately perpendicular to the electrodes.

[0021] When the liquid crystal composition of the present invention is used in a PSA-type liquid crystal display device, it is preferable that the liquid crystal composition of the present invention contains a UV-curable monomer in a proportion of 0.2% to 0.5%. Here, "a proportion of 0.2% to 0.5%" refers to the weight ratio of the UV-curable monomer contained in the liquid crystal composition to the total weight of the liquid crystal composition containing multiple compounds. During the production of a liquid crystal display device, the liquid crystal composition containing the UV-curable monomer is irradiated with UV light while applying a voltage, thereby separating the polymerized phase and stabilizing the slight tilt alignment.

[0022] This UV-curable monomer is also called a reactive mesogen and is preferably a polyfunctional monomer having multiple (two or more) functional groups. In particular, it is more preferable that the UV-curable monomer has two or three functional groups, and the two or three functional groups include at least one of a methacryloyl group, an acryloyl group, and a cinnamoyl group.

[0023] Preferred examples of conventionally known UV-curable monomers include the following structural formulas (5-1) to (5-5), and it is preferred that one or more of these be contained. [ka]

[0024] Furthermore, liquid crystal display elements using this liquid crystal composition are suitable for applications such as LCD televisions and LCD monitors, which require high-speed response, as well as in-vehicle displays and PIDs (public information displays), which require high-speed response at low temperatures. [Example]

[0025] Example 1 Liquid crystal composition (1) (hereinafter also referred to simply as "composition (1)") in Table 1 was prepared using compounds of the present invention of formula (1-1-1), which has a nematic liquid crystal phase at 65 to 108°C, and formula (1-2-1), which has a nematic liquid crystal phase at 99 to 132°C, synthesized using a conventional cross-coupling method. Table 1 shows the composition ratios of the compounds contained in the liquid crystal composition. The composition ratios shown here also correspond to the "content ratios" described above. In this example, "structural formula" is sometimes referred to simply as "formula," and compounds with the same serial number are considered to be equivalent or identical compounds.

[0026] The liquid crystal composition (1) had the following physical properties: the dielectric anisotropy (Δε) and the refractive index anisotropy (Δn) were measured at 25°C, and the rotational viscosity (γ1) was measured at 20°C. Nematic phase upper limit temperature (T n-i ): 80.5℃ Dielectric anisotropy (Δε): -3.3 Refractive index anisotropy (Δn): 0.11 Rotational viscosity (γ1): 116 mPa·s

[0027] Example 2 In the same manner as in Example 1, the liquid crystal composition (2) in Table 1 (hereinafter also simply referred to as "composition (2)") was prepared using the compound of formula (1-2-1).

[0028] The physical properties of the liquid crystal composition (2) were as follows: Nematic phase upper limit temperature (T n-i ): 80.3℃ Dielectric anisotropy (Δε): -3.3 Refractive index anisotropy (Δn): 0.11 Rotational viscosity (γ1): 102 mPa·s

[0029] Example 3 In the same manner as in Example 5, the liquid crystal composition (3) in Table 1 (hereinafter also simply referred to as "composition (3)") was prepared using the compounds of the present invention represented by formula (1-1-1), formula (1-2-1), and formula (1-2-2).

[0030] The physical properties of the liquid crystal composition (3) were as follows: Nematic phase upper limit temperature (T n-i ): 79.8℃ Dielectric anisotropy (Δε): -3.3 Refractive index anisotropy (Δn): 0.11 Rotational viscosity (γ1): 94 mPa·s

[0031] (Comparative Example 1) As a comparative example for Example 1, liquid crystal composition (4) (hereinafter also simply referred to as "composition (4)") in Table 1 was prepared using a conventional liquid crystal compound.

[0032] The physical properties of the liquid crystal composition (4) were as follows: Nematic phase upper limit temperature (T n-i ): 80.1℃ Dielectric anisotropy (Δε): -3.3 Refractive index anisotropy (Δn): 0.11 Rotational viscosity (γ1): 145 mPa·s

[0033] (Comparative Example 2) As a comparative example for Example 2, liquid crystal composition (5) (hereinafter also simply referred to as "composition (5)") in Table 1 was prepared using a conventional liquid crystal compound.

[0034] The physical properties of the liquid crystal composition (5) were as follows: Nematic phase upper limit temperature (T n-i ): 80.3℃ Dielectric anisotropy (Δε): -3.3 Refractive index anisotropy (Δn): 0.11 Rotational viscosity (γ1): 140 mPa·s

[0035] (Comparative Example 3) As a comparative example for Example 3, liquid crystal composition (6) in Table 1 (hereinafter also simply referred to as "composition (6)") was prepared using a conventional liquid crystal compound.

[0036] The physical properties of the liquid crystal composition (6) were as follows: Nematic phase upper limit temperature (T n-i ): 80.0℃ Dielectric anisotropy (Δε): -3.3 Refractive index anisotropy (Δn): 0.11 Rotational viscosity (γ1): 114 mPa·s

[0037] The liquid crystal compositions (1) to (6) all satisfy the characteristics typically required for liquid crystal compositions used in PSA-type or MVA-type liquid crystal displays for liquid crystal televisions, namely, the maximum nematic phase temperature (T n-i ) = 80°C, dielectric anisotropy (Δε) = -3.3, and refractive index anisotropy (Δn) = 0.11. Furthermore, composition (1) of Example (1) and composition (4) of Comparative Example (1) are composed of the same liquid crystal compounds except for the compounds of the present invention. Similarly, composition (2) of Example (2) and composition (5) of Comparative Example (2), and composition (3) of Example (3) and composition (6) of Comparative Example (3) are also composed of the same liquid crystal compounds except for the compounds of the present invention.

[0038] [Table 1]

[0039] The compounds of formula (3-1-1), formula (3-1-2), formula (3-5-1), formula (3-5-2), formula (3-3-1), formula (3-3-2), formula (3-4-1), formula (3-4-2), formula (3-4-3), formula (3-6-1), and formula (3-6-2) in Table 1 represent the following compounds. [ka]

[0040] The compounds of formulae (4-1-1) and (4-1-2) in Table 1 represent the following compounds. [ka]

[0041] The rotational viscosity (γ1) of composition (1) of Example (1) is 116 mPa·s, which is clearly lower than the rotational viscosity (γ1) of composition (4) of Comparative Example (1), 145 mPa·s. Similarly, the rotational viscosity of composition (2) of Example (2) is 102 mPa·s, which is lower than the 140 mPa·s of Comparative Example (2), and the rotational viscosity of composition (3) of Example (3) is 94 mPa·s, which is lower than the 114 mPa·s of Comparative Example (3). From these facts, it is clear that the liquid crystal compound and its liquid crystal composition of the present invention are effective in achieving high-speed response.

[0042] Example 4 In the same manner as in Example 1, liquid crystal composition (7) (hereinafter also simply referred to as "composition (7)") in Table 2 was prepared using compounds of formula (1-1-1) and formula (1-2-1). Table 2 shows the composition ratios of the compounds contained in the liquid crystal composition. The composition ratios shown here also correspond to the "content ratios" described above.

[0043] The physical properties of the liquid crystal composition (7) were as follows: Nematic phase upper limit temperature (T n-i ): 77.5℃ Dielectric anisotropy (Δε): -3.1 Refractive index anisotropy (Δn): 0.13 Rotational viscosity (γ1): 105 mPa·s

[0044] Example 5 In the same manner as in Example 1, liquid crystal composition (8) in Table 2 (hereinafter also simply referred to as "composition (8)") was prepared using compounds of formula (1-1-1), formula (1-2-1), and formula (1-2-2).

[0045] The physical properties of the liquid crystal composition (8) were as follows: Nematic phase upper limit temperature (T n-i ): 76.6℃ Dielectric anisotropy (Δε): -2.2 Refractive index anisotropy (Δn): 0.11 Rotational viscosity (γ1): 62 mPa·s

[0046] [Table 2]

[0047] Liquid crystal composition (7) of Example (4) is particularly suitable for 120 Hz PSA-type liquid crystal displays, which require high stability and a thin cell thickness. Liquid crystal composition (8) of Example (5) has a very low rotational viscosity and is suitable for high-speed PSA-type or FFS-type liquid crystal displays. Both compositions are extremely useful for producing cutting-edge liquid crystal displays.

Claims

1. a first composition; and a second composition different from the first composition; At least A liquid crystal composition exhibiting a predetermined dielectric anisotropy, The first composition is The compound includes one or more compounds represented by the following structural formula (1-1) and structural formula (1-2): 【Chemistry 1】 (In the formula, R １ represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; R ２ represents an alkyl group having 1 to 4 carbon atoms or an alkenyl group having 2 to 4 carbon atoms. The second composition is The compound includes one or more compounds represented by the following structural formulas (2-1) to (2-6): 【Chemistry 2】 (In the formula, R ３ represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; R ４ represents an alkyl group or an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 3 to 5 carbon atoms. The content ratio of the first composition is 5% to 50%; The content ratio of the second composition is 40% to 80% The dielectric anisotropy shown at 25°C is -2.0 to -3.9 Liquid crystal composition.

2. When the first composition contains the compound of the structural formula (1-1), the compound of the structural formula (1-1) is The compound includes one or more compounds represented by the following structural formulas (1-1-1), (1-1-2), (1-1-3), and (1-1-4): When the first composition contains the compound of the structural formula (1-2), the compound of the structural formula (1-2) is Contains one or more compounds represented by the following structural formulas (1-2-1), (1-2-2), (1-2-3), and (1-2-4): The liquid crystal composition of claim 1. 【Transformation 3】

3. The content ratio of the second composition is Between 50% and 80% The liquid crystal composition according to claim 1 or 2.

4. The content ratio of the second composition is Between 60% and 80% The liquid crystal composition of claim 3.

5. The content ratio of the first composition is 31% to 50% The liquid crystal composition according to claim 1, claim 2, or claim 4.

6. The content ratio of the first composition is 31% to 50% The liquid crystal composition of claim 3.

7. further comprising a third composition different from both the first composition and the second composition; The third composition comprises: Contains one or more compounds represented by the following structural formulas (3-1) to (3-6): The liquid crystal composition according to claim 1, claim 2, claim 4, or claim 6. 【Chemistry 4】 (In the formula, R ５ represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; R ６ represents an alkyl group having 1 to 5 carbon atoms.

8. further comprising a third composition different from both the first composition and the second composition; The third composition comprises: Contains one or more compounds represented by the following structural formulas (3-1) to (3-6): The liquid crystal composition of claim 3. 【Transformation 5】 (In the formula, R ５ represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; R ６ represents an alkyl group having 1 to 5 carbon atoms.

9. further comprising a third composition different from both the first composition and the second composition; The third composition comprises: Contains one or more compounds represented by the following structural formulas (3-1) to (3-6): The liquid crystal composition of claim 5. 【Transformation 6】 (In the formula, R ５ represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; R ６ represents an alkyl group having 1 to 5 carbon atoms.

10. Further contains 0.2% to 0.5% of a UV-curable monomer having multiple functional groups. The liquid crystal composition according to any one of claims 1 to 9.

11. Further contains 0.2% to 0.5% of a UV-curable monomer having multiple functional groups. The liquid crystal composition of claim 3.

12. Further contains 0.2% to 0.5% of a UV-curable monomer having multiple functional groups. The liquid crystal composition of claim 5.

13. Further contains 0.2% to 0.5% of a UV-curable monomer having multiple functional groups. The liquid crystal composition of claim 7.

14. The UV-curable monomer has two or three functional groups, and the two or three functional groups include at least one of a methacryloyl group, an acryloyl group, and a cinnamoyl group. The liquid crystal composition of claim 10.

15. The UV-curable monomer has two or three functional groups, and the two or three functional groups include at least one of a methacryloyl group, an acryloyl group, and a cinnamoyl group. The liquid crystal composition according to claim 11, claim 12, or claim 13.

16. 15. The liquid crystal composition according to claim 14, wherein the UV-curable monomer comprises one or more compounds represented by the following structural formulas (5-1) to (5-5): 【Transformation 7】

17. 16. The liquid crystal composition according to claim 15, comprising, as the UV-curable monomer, one or more compounds represented by the following structural formulas (5-1) to (5-5): 【Transformation 8】

18. A liquid crystal display element using the liquid crystal composition according to any one of claims 1 to 17.

19. A liquid crystal display device using the liquid crystal composition according to claim 5.

20. A liquid crystal display device using the liquid crystal composition according to claim 7.

21. A liquid crystal display device using the liquid crystal composition according to claim 10.

22. A liquid crystal display device using the liquid crystal composition according to claim 15.

23. 19. The liquid crystal display element of claim 18, which is of a MVA (multi-domain vertical alignment) type, a PSA (polymer sustained alignment) type, an IPS (in-plane switching) type, or an FFS (fringe field switching) type.

24. 23. The liquid crystal display element according to claim 19, 20, 21, or 22, which is a multi-domain vertical alignment (MVA) type, a polymer sustained alignment (PSA) type, an in-plane switching (IPS) type, or a fringe field switching (FFS) type.

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