Liquid crystal composition and liquid crystal display element

Abstract

To provide a liquid crystal display device that has a liquid crystal layer using a liquid crystal composition including a liquid crystal compound showing a specific negative dielectric anisotropy, thereby achieving both of high-speed response and reduced / suppressed flicker.SOLUTION: A liquid crystal display device has a first substrate and a second substrate disposed opposite each other, a liquid crystal layer that is held between the first substrate and second substrate and includes a liquid crystal composition, a first electrode provided on the first substrate, and a second electrode that is provided on the first substrate and generates an electric field between the second electrode and the first electrode, the liquid crystal composition including a combination of specific compounds.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a liquid crystal composition and a liquid crystal display element useful as a component of a liquid crystal display device or the like.

Background Art

[0002] Liquid crystal display elements are used in various household electrical appliances, measuring instruments, automotive panels, word processors, electronic notebooks, printers, computers, televisions, etc., including clocks and calculators. Representative liquid crystal display modes include TN (twisted nematic) mode, STN (super twisted nematic) mode, DS (dynamic light scattering) mode, GH (guest - host) mode, IPS (in - plane switching) mode, FFS (fringe field switching) mode, OCB (optically compensated birefringence) mode, ECB (electric - field - controlled birefringence) mode, VA (vertical alignment) mode, CSH (color super homeotropic) mode, or FLC (ferroelectric liquid crystal), etc.

[0003] Among these, as liquid crystal displays for smartphones and tablets, liquid crystal display devices in the IPS mode, which is of high quality and excellent in visual characteristics, and the FFS mode, which is a kind of the IPS mode, are widely used. The IPS mode and the FFS mode are horizontal - electric - field modes that utilize an electric field generated in the horizontal direction with respect to the substrate, and a liquid crystal material having a negative value of Δε can be used. As a liquid crystal material having a negative Δε and a large absolute value thereof, for example, liquid crystal compositions using the following compound (A), compound (B), and compound (C), etc. are known (see Patent Document 1).

[0004]

Chemical formula

[0005] In the IPS mode and the FFS mode, similar to other driving methods, a liquid crystal display element with high - speed response and low - voltage driving is required.

[0006] Among them, as one of the themes of low-voltage driving, liquid crystal display elements that operate with low power consumption have attracted attention in recent years due to the social trend of promoting energy conservation and the widespread use of smartphones and the like. Currently, as a means of reducing power consumption, low-frequency driving that reduces the driving frequency of liquid crystal display elements below the standard state and intermittent driving that provides a pause period after writing for one frame period have been proposed. However, since the voltage changes significantly and the pixel potential fluctuates greatly when switching from the writing period to the pause period, a problem has been confirmed in that flicker occurs particularly when switching frame periods, resulting in a decrease in display quality, due to a large difference between the display brightness during the pause period and the display brightness during the writing period of the next frame period.

[0007] As one of the causes of such flicker, it is considered that flicker caused by flexo polarization of liquid crystal molecules is involved. Specifically, in a liquid crystal display element, when a DC voltage is applied to the liquid crystal layer for a long time, the display characteristics change over time due to charge-up, so frame driving that reverses the positive and negative polarities every frame is common. Although it is ideal to control the alignment state of liquid crystal molecules based only on the potential difference between the pixel electrode and the counter electrode, in reality, a strong electric field acts on the end of the pixel electrode, causing the liquid crystal molecules to reverse polarization. When the polarity of the electric field is reversed, this polarization (flexo polarization) reacts instantaneously, resulting in flicker due to luminance fluctuations.

[0008] Generally, the liquid crystal composition used in the liquid crystal layer contains two components: a compound with negative dielectric anisotropy (measured at 25°C, the same applies hereinafter) (polar component) and a compound with neutral dielectric anisotropy (non-polar component), and several to dozens of liquid crystal compounds are included in the liquid crystal composition as a whole. Therefore, the liquid crystal compounds that actually contribute to flexo polarization are compounds with negative dielectric anisotropy (polar components) in a part of the liquid crystal composition. At present, the polarization of the liquid crystal molecules constituting the liquid crystal layer cannot be averaged as expected, and the effect of reducing and suppressing flicker is not exerted.

Prior Art Documents

Patent Documents

[0009] Patent Document 1 International Publication No. 2010 / 084823 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] Therefore, the problem to be solved by the present invention is to achieve both high-speed response and reduction / suppression of flicker by a liquid crystal display device including a liquid crystal layer using a liquid crystal composition containing a liquid crystal compound exhibiting a specific negative dielectric anisotropy. MEANS FOR SOLVING THE PROBLEMS

[0011] The inventors of the present invention examined the configurations of various liquid crystal compositions and found that the above problems can be solved by a liquid crystal display device in FFS mode or IPS mode using a specific liquid crystal composition, leading to the completion of the present invention.

[0012] The present invention includes a first substrate and a second substrate disposed opposite to each other, a liquid crystal layer containing a liquid crystal composition sandwiched between the first substrate and the second substrate, a first electrode provided on the first substrate, and a second electrode provided on the first substrate and configured to generate an electric field between the second electrode and the first electrode. The liquid crystal composition is General formula (N-1-1)

[0013] (Chemical formula)

[0014] (In the formula, R N111 and R N112Each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. It contains one kind of the compound represented by (), and the content thereof is 10% by mass or more based on the total amount of the liquid crystal composition. General formula (N-1-2)

[0015]

Chemical formula

[0016] (In the formula, R N121 and R N122 Each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. It contains one kind of the compound represented by (), and the content thereof is 10% by mass or more based on the total amount of the liquid crystal composition. General formula (N-1-3)

[0017]

Chemical formula

[0018] (In the formula, R N131 and R N132 Each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. It contains one kind of the compound represented by (). Formula (ii-1.22)

[0019]

Chemical formula

[0020] Contains the compound represented by Formula (ii-1.13)

[0021] [Chemical formula]

[0022] containing a compound represented by, and General formula (L-4) and / or general formula (L-5)

[0023] [Chemical formula]

[0024] (wherein, R L51 and R L52 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-.) A liquid crystal display element containing one or more compounds selected from the group of compounds represented by is provided. [Advantages of the Invention]

[0025] The liquid crystal display element of the present invention has an excellent display quality, a fast response speed, and suppressed flicker. [Brief Description of the Drawings]

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0027] The liquid crystal composition of the present invention contains a compound represented by the general formula (N-1-1) as a compound having a dielectric anisotropy greater than -2. In order to achieve both high-speed response and reduction / suppression of flicker of the resulting liquid crystal display element, it is important to use only one kind of the compound represented by the general formula (N-1-1).

[0028]

Chemical formula

[0029] (In the formula, R N111 and R N112 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-.) R N111 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and a propyl group or a pentyl group is preferred. R N112 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and an ethoxy group or a butoxy group is preferred.

[0030] Furthermore, the compound represented by the general formula (N-1-1) is preferably a compound selected from the group of compounds represented by the formulas (N-1-1.1) to (N-1-1.8), more preferably a compound represented by the formulas (N-1-1.1) to (N-1-1.4), still more preferably a compound represented by the formulas (N-1-1.1) and (N-1-1.3), and most preferably a compound represented by the formula (N-1-1.1).

[0031] [Chemical formula]

[0032] When emphasizing the improvement of Δη, it is preferable to set the content higher. When emphasizing the solubility at low temperatures, setting the content higher has a high effect. When emphasizing T NI it is highly effective to set the content lower. Furthermore, when improving the dripping marks and the sticking characteristics, it is preferable to set the content range in the middle. Also, in order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, the lower limit of the preferred content of one kind of the compound represented by the formula (N-1-1), more specifically, one kind of compound selected from the group of compounds represented by the formulas (N-1-1.1) to (N-1-1.8), is 10% by mass, 11% by mass, 12% by mass, or 13% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 35% by mass, 30% by mass, 29% by mass, 28% by mass, 27% by mass, 25% by mass, 24% by mass, 23% by mass, 22% by mass, 21% by mass, 20% by mass, 18% by mass, or 17% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0033] The liquid crystal composition of the present invention contains a compound represented by the general formula (N-1-2) as a compound having a dielectric anisotropy greater than -2. In order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, it is important to use only one kind of the compound represented by the general formula (N-1-2).

[0034] [Chemical formula]

[0035] (In the formula, R N121 and R N122 each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-.) R N121 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group, a butyl group or a pentyl group. R N122 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and is preferably a methyl group, a propyl group, a methoxy group, an ethoxy group or a propoxy group.

[0036] Furthermore, the compound represented by the general formula (N-1-2) is preferably a compound selected from the group of compounds represented by the formulas (N-1-2.1) to (N-1-2.11), and is preferably a compound represented by the formulas (N-1-2.3) to (N-1-2.7), formula (N-1-2.8), formula (N-1-2.9) and formula (N-1-2.11), and is preferably a compound represented by the formulas (N-1-2.3) to (N-1-2.7), and is preferably a compound represented by formula (N-1-2.4).

[0037] [Chemical formula]

[0038] In order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, the lower limit of the preferred content of one compound represented by the formula (N-1-2), more specifically, one compound selected from the group of compounds represented by the formulas (N-1-2.1) to (N-1-2.11), is 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 35% by mass, 30% by mass, 29% by mass, 28% by mass, 27% by mass, 26% by mass, 25% by mass, 24% by mass, 23% by mass, 21% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0039] The liquid crystal composition of the present invention contains a compound represented by the general formula (N-1-3) as a compound having a dielectric anisotropy greater than -2. In order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, it is important to use only one kind of the compound represented by the general formula (N-1-3).

[0040] [Chemical formula]

[0041] (In the formula, R N131 and R N132 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. R N131 and R N132 each independently preferably represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and more preferably a methyl group, a propyl group, an ethoxy group or a butoxy group.

[0042] Furthermore, the compound represented by the general formula (N-1-3) is preferably a compound selected from the group of compounds represented by the formulas (N-1-3.1) to (N-1-3.8), preferably a compound represented by the formulas (N-1-3.1) to (N-1-3.4), preferably a compound represented by the formulas (N-1-3.1) and (N-1-3.2), and preferably a compound represented by the formula (N-1-3.2).

[0043]

Chemical formula

[0044] When emphasizing the improvement of Δη, it is preferable to set the content higher. When emphasizing the solubility at low temperatures, setting the content higher has a high effect. When emphasizing T NI When emphasizing it, setting the content lower has a high effect. Also, in order to achieve both high-speed response and reduction / suppression of flicker of the obtained liquid crystal display element, the lower limit of the preferable content of one kind of the compound represented by the formula (N-1-3), more specifically, one kind of the compound selected from the group of compounds represented by the formulas (N-1-3.1) to (N-1-3.8) is 3% by mass, 5% by mass, 7% by mass, 10% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferable content is 30% by mass, 25% by mass, 20% by mass, 18% by mass, 16% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0045] In the liquid crystal composition of the present invention, as a compound having a dielectric anisotropy greater than -2, it is preferable to use one or more compounds selected from the group of compounds represented by the general formula (N-1-4-1) and / or the general formula (N-1-4-2).

[0046]

Chemical formula

[0047] (In the formula, R 1411 , R 1412 , R 1421 and R1422 each independently represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms or an alkenyloxy group having 2 to 8 carbon atoms; ring A represents a 1,4-cyclohexylene group (one -CH2- present in this group or two or more non - adjacent -CH2- may be replaced by -O-), or a 1,4-phenylene group (one -CH= present in this group or two or more non - adjacent -CH= may be replaced by -N=); X 1241 and X 1242 of which, one represents a fluorine atom, while the other represents a hydrogen atom.) In general formula (N - 1 - 4 - 1), R N1411 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group, a butyl group or a pentyl group. R N1412 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and preferably a methyl group, a propyl group, a methoxy group, an ethoxy group or a propoxy group.

[0048] Furthermore, the compound represented by general formula (N - 1 - 4 - 1) is preferably a compound selected from the group of compounds represented by formula (N - 1 - 4 - 1.1) to formula (N - 1 - 4 - 1.8), preferably a compound represented by formula (N - 1 - 4 - 1.1) to (N - 1 - 4 - 1.4), and preferably a compound represented by formula (N - 1 - 4 - 1.1) to formula (N - 1 - 4 - 1.2).

[0049]

Chemical formula

[0050] In order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, the lower limit of the preferred content of one compound represented by the formula (N-1-4-1), more specifically, one compound selected from the group of compounds represented by the formulas (N-1-4-1.1) to (N-1-4-1.8), is 0% by mass, 2% by mass, 4% by mass, or 6% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 15% by mass, 10% by mass, 8% by mass, or 7% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0051] Also, in the general formula (N-1-4-2), R N1421 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group, a butyl group, or a pentyl group. R N1422 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably a methyl group, a propyl group, a methoxy group, an ethoxy group, or a propoxy group.

[0052] Furthermore, the compound represented by the general formula (N-1-4-2) is preferably a compound selected from the group of compounds represented by the formulas (N-1-4-2.1) to (N-1-4-2.16), preferably a compound represented by the formulas (N-1-4-2.1) to (N-1-4-2.4), (N-1-4-2.9) to (N-1-4-2.12), preferably a compound represented by the formulas (N-1-4-2.1) to (N-1-4-2.4), and preferably a compound represented by the formulas (N-1-4-2.2) to (N-1-4-2.3).

[0053]

Chemical formula

[0054] In order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, the lower limit of the preferred content of one compound represented by the formula (N-1-4-2), more specifically, one compound selected from the group of compounds represented by the formulas (N-1-4-2.1) to (N-1-4-2.16) is 0% by mass, 2% by mass, 4% by mass, or 6% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 18% by mass, 15% by mass, 12% by mass, or 10% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0055] In the liquid crystal composition of the present invention, as a compound having a dielectric anisotropy greater than -2, further, a compound represented by the general formula (N-1-5), a compound represented by the general formula (N-1-12), a compound represented by the general formula (N-1-13), a compound represented by the general formula (N-1-15), or a compound selected from the group of compounds represented by the general formula (N-1-17) may be used alone or in combination of two or more. However, in order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, as a compound having a dielectric anisotropy greater than -2, it is preferably composed of only one compound represented by the general formula (N-1-1), one compound represented by the general formula (N-1-2), one compound represented by the general formula (N-1-3), and one or two or more compounds selected from the group of compounds represented by the general formula (N-1-4-1) and / or the general formula (N-1-4-2).

[0056] The compound represented by the general formula (N-1-5) is the following compound.

[0057]

Chemical formula

[0058] (In the formula, R N151 and R N152Each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. R N151 and R N152 Each independently is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group.

[0059] The compound represented by the general formula (N-1-12) is the following compound.

[0060]

Chemical formula

[0061] (In the formula, R N1121 and R N1122 Each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. R N1121 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group. R N1122 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and is preferably an ethoxy group, a propoxy group or a butoxy group.

[0062] The compound represented by the general formula (N-1-13) is the following compound.

[0063]

Chemical formula

[0064] (In the formula, R N1131 and RN1132 Each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. R N1131 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group. R N1132 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and is preferably an ethoxy group, a propoxy group or a butoxy group.

[0065] The compound represented by the general formula (N-1-15) is the following compound.

[0066]

Chemical formula

[0067] (In the formula, R N1151 and R N1152 Each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. R N1151 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and is preferably an ethyl group, a propyl group or a butyl group. R N1152 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and is preferably an ethoxy group, a propoxy group or a butoxy group.

[0068] The compound represented by the general formula (N-1-17) is the following compound.

[0069]

Chemical formula

[0070] (In the formula, R N1171 and R N1172 each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-.) R N1171 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and an ethyl group, a propyl group or a butyl group is preferred. R N1172 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and an ethoxy group, a propoxy group or a butoxy group is preferred.)

[0071] In the liquid crystal composition of the present invention, as a compound having a dielectric anisotropy greater than -2, further, when one or more compounds selected from the group of compounds represented by general formula (N-1-5), general formula (N-1-12), general formula (N-1-13), general formula (N-1-15), and general formula (N-1-17) are used, the lower limit value of the preferred content is 0% by mass, 1% by mass, 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit value of the preferred content is 7% by mass, 5% by mass, 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.)

[0072] The liquid crystal composition of the present invention contains, as a compound that is substantially dielectrically neutral (the value of Δε is -2 to 2), a compound represented by formula (ii-1.22) as an essential component.)

[0073] [Chemical formula]

[0074] In order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, the lower limit of the preferred content of the compound represented by the formula (ii-1.22) is 10% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 20% by mass, 21% by mass, 22% by mass, 23% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 38% by mass, 35% by mass, 32% by mass, 30% by mass, 29% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0075] The liquid crystal composition of the present invention contains, as a compound that is substantially dielectrically neutral (Δε value is -2 to 2), the compound represented by the formula (ii-1.13) as an essential component.

[0076]

Chemical formula

[0077] In order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, the lower limit of the preferred content of the compound represented by the formula (ii-1.13) is 5% by mass, 8% by mass, 10% by mass, 15% by mass, 17% by mass, 18% by mass, 20% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 40% by mass, 35% by mass, 25% by mass, 22% by mass, 20% by mass, 17% by mass, 15% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0078] The liquid crystal composition of the present invention contains, as a compound that is substantially dielectrically neutral (Δε value is -2 to 2), one or more compounds selected from the group of compounds represented by the general formula (L-4) and / or the general formula (L-5) as essential components.

[0079] In order to achieve both high-speed response and reduction / suppression of flicker in the resulting liquid crystal display element, the lower limit of the preferable total content of the compounds selected from the group of compounds represented by general formula (L-4) and / or general formula (L-5) is 3% by mass, 5% by mass, 7% by mass, 9% by mass, or 10% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferable total content is 25% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, or 11% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0080] The compound represented by general formula (L-4) is the following compound.

[0081]

Chemical formula

[0082] (In the formula, R L41 and R L42 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. ) R L41 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R L42 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

[0083] The compound represented by general formula (L-4) can be used alone, or two or more compounds can be used in combination. There is no particular limitation on the types of compounds that can be combined, but they are used in appropriate combinations depending on the required performance, such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence, as well as on achieving both high-speed response and reduced / suppressed flicker in the resulting liquid crystal display device. In one embodiment of the present invention, the types of compounds used may be, for example, one, two, three, four, or five or more.

[0084] In the liquid crystal composition of the present invention, the content of the compound represented by general formula (L-4) needs to be appropriately adjusted depending on the required performance such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, process compatibility, drop marks, image sticking, and dielectric anisotropy.

[0085] To achieve both high-speed response and reduced flicker in the resulting liquid crystal display element, the lower limit of the total content of the compound represented by general formula (L-4) is preferably 3 mass%, 5 mass%, 7 mass%, 9 mass%, or 10 mass%, relative to the total amount of the liquid crystal composition of the present invention. The upper limit of the total content is preferably 25 mass%, 20 mass%, 18 mass%, 15 mass%, 13 mass%, or 11 mass%, relative to the total amount of the liquid crystal composition of the present invention.

[0086] The compound represented by general formula (L-4) is preferably a compound represented by formula (L-4.1) to formula (L-4.3), for example.

[0087] [ka]

[0088] Depending on the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence, the composition may contain the compound represented by formula (L-4.1), the compound represented by formula (L-4.2), both the compound represented by formula (L-4.1) and the compound represented by formula (L-4.2), or may contain all of the compounds represented by formula (L-4.1) to formula (L-4.3).

[0089] The lower limit of the preferred content of the compound represented by formula (L-4.1) or formula (L-4.2) relative to the total amount of the liquid crystal composition of the present invention is 0% by mass, 1% by mass, 3% by mass, 5% by mass, 7% by mass, 9% by mass, and the preferred upper limit is 15% by mass, 13% by mass, 10% by mass, 8% by mass, 5% by mass.

[0090] When containing both the compound represented by formula (L-4.1) and the compound represented by formula (L-4.2), the lower limit of the preferred content of both compounds relative to the total amount of the liquid crystal composition of the present invention is 0% by mass, 1% by mass, 3% by mass, 5% by mass, 7% by mass, 9% by mass, and the preferred upper limit is 15% by mass, 13% by mass, 10% by mass, 8% by mass, 5% by mass.

[0091] The compound represented by general formula (L-4) is preferably, for example, a compound represented by formula (L-4.4) to formula (L-4.6), and preferably a compound represented by formula (L-4.4).

[0092]

Chemical formula

[0093] Depending on the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence, the composition may contain the compound represented by formula (L-4.4), the compound represented by formula (L-4.5), or both the compound represented by formula (L-4.4) and the compound represented by formula (L-4.5).

[0094] The preferred lower limit of the content of the compound represented by formula (L-4.4) and / or formula (L-4.5) relative to the total amount of the liquid crystal composition of the present invention is 3 mass%, 5 mass%, 7 mass%, 9 mass%, or 10 mass%, and the preferred upper limit of the total content is 25 mass%, 20 mass%, 18 mass%, 15 mass%, 13 mass%, or 11 mass%, relative to the total amount of the liquid crystal composition of the present invention.

[0095] The compound represented by general formula (L-4) is preferably a compound represented by formula (L-4.7) to formula (L-4.10), and particularly preferably a compound represented by formula (L-4.9).

[0096] [ka]

[0097] The preferred lower limit of the content of the compound represented by formula (L-4.7), formula (L-4.8), formula (L-4.9) and / or formula (L-4.10) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, 3 mass%, 5 mass%, 7 mass%, or 9 mass%, and the preferred upper limit is 15 mass%, 13 mass%, 10 mass%, 8 mass%, or 5 mass%.

[0098] The compound represented by general formula (L-5) is the following compound.

[0099] [ka]

[0100] (In the formula, R L51 and R L52each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH2- groups in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-.) R L51 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R L52 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.

[0101] The compound represented by the general formula (L-5) can be used alone, or two or more compounds can be used in combination. There is no particular limitation on the types of compounds that can be combined, but from the viewpoint of achieving both high-speed response and reduction / suppression of flicker of the resulting liquid crystal display element, and according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., they are appropriately combined and used. The types of compounds to be used are, for example, one type, two types, three types, four types, or five or more types as one embodiment of the present invention.

[0102] In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-5) needs to be appropriately adjusted according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, burning, and dielectric anisotropy.

[0103] In order to achieve both high-speed response and reduction / suppression of flicker of the resulting liquid crystal display element, the lower limit of the preferable total content of the compound represented by the general formula (L-5) is 0% by mass, 3% by mass, 5% by mass, 7% by mass, 9% by mass, or 10% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferable total content is 25% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, or 11% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0104] The compound represented by the general formula (L-5) is preferably a compound represented by the formula (L-5.1), the formula (L-5.2) or the formula (L-5.3), and particularly preferably a compound represented by the formula (L-5.1).

[0105] When these compounds are used alone or in combination with respect to the total amount of the liquid crystal composition of the present invention, the lower limit of the preferable content is 0% by mass, 1% by mass, 3% by mass, 5% by mass, 7% by mass, 9% by mass, and the preferable upper limit is 15% by mass, 13% by mass, 10% by mass, 8% by mass, 5% by mass.

[0106]

Chemical formula

[0107] The compound represented by the general formula (L-5) is preferably a compound represented by the formula (L-5.3) or the formula (L-5.4).

[0108] When these compounds are used alone or in combination with respect to the total amount of the liquid crystal composition of the present invention, the lower limit of the preferable content is 0% by mass, 1% by mass, 3% by mass, 5% by mass, 7% by mass, 9% by mass, and the preferable upper limit is 15% by mass, 13% by mass, 10% by mass, 8% by mass, 5% by mass.

[0109]

Chemical formula

[0110] The compound represented by the general formula (L-5) is preferably a compound selected from the group of compounds represented by the formula (L-5.5) to the formula (L-5.7), and particularly preferably a compound represented by the formula (L-5.7).

[0111] The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 0% by mass, 1% by mass, 3% by mass, 5% by mass, 7% by mass, 9% by mass, and the preferable upper limit is 15% by mass, 13% by mass, 10% by mass, 8% by mass, 5% by mass.

[0112]

Chemical formula

[0113] In the liquid crystal composition of the present invention, as a compound that is substantially dielectrically neutral (the value of Δε is -2 to 2), one or more compounds selected from the compounds represented by the following general formula (L) may be used. However, in order to achieve both high-speed response and reduction / suppression of flicker of the resulting liquid crystal display element, as a compound that is substantially dielectrically neutral, it is preferably composed only of the compound represented by the general formula (ii-1.22), the compound represented by the general formula (L-4), the compound represented by the general formula (L-5), and, if necessary, the compound represented by the general formula (ii-1.13).

[0114] Also, when using one or more compounds selected from the group of compounds represented by the general formula (L), the lower limit of the preferable content is 0% by mass, 1% by mass, 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The preferable upper limit of the content is 7% by mass, 5% by mass, 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0115] The compound represented by the general formula (L) is the following compound.

[0116]

Chemical formula

[0117] (In the formula, R L1 and R L2each independently represent an alkyl group having 1 to 8 carbon atoms, in which one or two or more non-adjacent -CH- groups may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -COO-, or -OCO-; n L1 represents 1, 2 or 3, A L1 , A L2 and A L3 are each independently (a) a 1,4-cyclohexylene group (in which one —CH— or two or more non-adjacent —CH— groups may be replaced by —O—). (b) a 1,4-phenylene group (in which one -CH= or two or more non-adjacent -CH= groups may be replaced by -N=); and (c) A naphthalene-2,6-diyl group, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, or a decahydronaphthalene-2,6-diyl group (one -CH= or two or more non-adjacent -CH= groups in the naphthalene-2,6-diyl group or the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group may be replaced by -N=). wherein the groups (a), (b) and (c) may each independently be substituted with a cyano group, a fluorine atom or a chlorine atom; Z L1 and Z L2 each independently represents a single bond, -CH2CH2-, -(CH2)4-, -OCH2-, -CHO-, -COO-, -OCO-, -OCF2-, -CF2O-, -CH=NN=CH-, -CH=CH-, -CF=CF- or -C≡C-, A L2 and Z L3 When there are a plurality of groups, they may be the same or different. However, in the general formula (L), compounds represented by formula (ii-1.22), general formula (L-4), general formula (L-5), and compounds represented by formula (ii-1.13) are excluded. The compound represented by general formula (L) may be used alone or in combination. There is no particular limitation on the type of compound that can be combined, but appropriate combinations are used depending on the desired performance, such as low-temperature solubility, transition temperature, electrical reliability, and birefringence. In one embodiment of the present invention, for example, one type of compound is used. Alternatively, in another embodiment of the present invention, two, three, four, five, six, seven, eight, nine, or ten or more types of compounds are used.

[0118] In the liquid crystal composition of the present invention, the content of the compound represented by general formula (L) needs to be appropriately adjusted depending on the required performance such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, process compatibility, drop marks, image sticking, and dielectric anisotropy.

[0119] R if reliability is important L1 and R L2 Preferably, both of are alkyl groups, and when emphasis is placed on reducing the volatility of the compound, they are preferably alkoxy groups, and when emphasis is placed on reducing the viscosity, it is preferable that at least one of them is an alkenyl group.

[0120] R L1 and R L2 When the ring structure to which it is bonded is a phenyl group (aromatic), it is preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or an alkenyl group having 4 to 5 carbon atoms, and when the ring structure to which it is bonded is a saturated ring structure such as cyclohexane, pyran, or dioxane, it is preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or a linear alkenyl group having 2 to 5 carbon atoms. In order to stabilize the nematic phase, it is preferable that the total number of carbon atoms and, if present, oxygen atoms is 5 or less, and it is preferably linear.

[0121] The alkenyl group is preferably selected from the groups represented by any one of the formulas (R1) to (R9). (The black dots in each formula represent carbon atoms in the ring structure.)

[0122]

Chemical formula

[0123] n L1 is preferably 0 when emphasizing the response speed, preferably 2 or 3 for improving the upper limit temperature of the nematic phase, and preferably 1 for balancing these. Also, it is preferable to combine compounds with different values to satisfy the required properties of the composition.

[0124] A L1 、A L2 and A L3 are preferably aromatic when it is required to increase Δn, preferably aliphatic for improving the response speed, and each independently represents a trans-1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo[2.2.2]octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably represents the following structure,

[0125]

Chemical formula

[0126] more preferably represents a trans-1,4-cyclohexylene group or a 1,4-phenylene group.

[0127] Z L1 and Z L2 are preferably a single bond when emphasizing the response speed.

[0128] The number of halogen atoms in the molecule is preferably 0 or 1.

[0129] The compound represented by general formula (L) is preferably a compound selected from the group of compounds represented by general formula (ii-1), general formula (ii-3), general formula (ii-4), general formula (L-2), general formula (L-6), and / or general formula (L-7).

[0130] The compound represented by general formula (L) is preferably a compound represented by general formula (ii-1) (excluding the compounds represented by formula (ii-1.13) and formula (ii-1.22)).

[0131] [ka]

[0132] (In the formula, R ii11 represents a hydrogen atom or a methyl group, and R ii2 represents an alkyl group having 1 to 10 carbon atoms, and one or two or more non-adjacent -CH2- groups in the alkyl group may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -COO-, or -OCO-. The preferred lower limit of the content is 0 mass %, 1 mass %, or 2 mass % relative to the total amount of the liquid crystal composition of the present invention, and the preferred upper limit of the content is 7 mass %, 5 mass %, or 3 mass % relative to the total amount of the liquid crystal composition of the present invention.

[0133] The compound represented by general formula (ii-1) is preferably a compound selected from the group of compounds represented by formulas (ii-1.11) to (ii-1.12).

[0134] [ka]

[0135] With respect to the total amount of the liquid crystal composition of the present invention, the lower limit of the preferred content of each compound or the total of the compounds represented by Formula (ii-1.11) to Formula (ii-1.12) is 0% by mass, 1% by mass, or 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 7% by mass, 5% by mass, or 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0136] Further, the compound represented by General Formula (ii-1) is preferably a compound selected from the group of compounds represented by Formula (ii-1.21) to Formula (ii-1.24), and more preferably a compound represented by Formula (ii-1.23) to Formula (ii-1.24).

[0137]

Chemical Formula

[0138] With respect to the total amount of the liquid crystal composition of the present invention, the lower limit of the preferred content of each compound or the total of the compounds represented by Formula (ii-1.21) to Formula (ii-1.24) is 0% by mass, 1% by mass, or 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 7% by mass, 5% by mass, or 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0139] Further, the compound represented by General Formula (ii-1) is preferably a compound selected from the group of compounds represented by Formula (ii-1.31) and Formula (ii-1.41).

[0140]

Chemical Formula

[0141] The lower limit of the preferred content of each compound or the total amount of compounds represented by formula (ii-1.31) to formula (ii-1.41) with respect to the total amount of the liquid crystal composition of the present invention is 0% by mass, 1% by mass, and 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 7% by mass, 5% by mass, and 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0142] The compound represented by the general formula (L) is preferably a compound selected from the group of compounds represented by the general formula (ii-3) and / or (ii-4).

[0143]

Chemical formula

[0144] (In the formula, R ii31 and R ii41 each independently represent an alkyl group having 1 to 10 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. ) R ii31 and R ii32 are preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms.

[0145] The lower limit of the preferred content of the compound represented by formula (ii-3) with respect to the total amount of the liquid crystal composition of the present invention is 0% by mass, 1% by mass, and 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 7% by mass, 5% by mass, and 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0146] The lower limit of the preferred content of the compound represented by the formula (ii-4) with respect to the total amount of the liquid crystal composition of the present invention is 0% by mass, 1% by mass, and 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 7% by mass, 5% by mass, and 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0147] Furthermore, the compounds represented by the general formulas (ii-3) and (ii-4) are preferably compounds selected from the group of compounds represented by the formulas (ii-3.1) to (ii-4.3), and are preferably compounds represented by the formula (ii-3.2) or the formula (ii-4.2).

[0148]

Chemical formula

[0149] The lower limit of the preferred content of each compound or the total of the compounds represented by the formulas (ii-3.1) to (ii-4.3) with respect to the total amount of the liquid crystal composition of the present invention is 0% by mass, 1% by mass, and 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 7% by mass, 5% by mass, and 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0150] The compound represented by the general formula (L) is preferably a compound selected from the group of compounds represented by the general formula (L-2).

[0151] The compound represented by the general formula (L-2) is the following compound.

[0152]

Chemical formula

[0153] (In the formula, R L21 and R L22each independently represents an alkyl group having 1 to 10 carbon atoms, and one or two or more non-adjacent -CH2- groups in the alkyl group may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -COO-, or -OCO-. R L21 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R L22 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

[0154] The compound represented by general formula (L-2) can be used alone, or two or more compounds can be used in combination. There is no particular limitation on the types of compounds that can be combined, but appropriate combinations are used depending on the required performance, such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. In one embodiment of the present invention, the types of compounds used are, for example, one type, two types, three types, four types, or five or more types.

[0155] The preferred lower limit of the total content of the compounds represented by formula (L-2) relative to the total amount of the liquid crystal composition of the present invention is 0 mass %, 1 mass %, or 2 mass %, and the preferred upper limit of the content is 7 mass %, 5 mass %, or 3 mass %, relative to the total amount of the liquid crystal composition of the present invention.

[0156] Furthermore, the compound represented by general formula (L-2) is preferably a compound selected from the group of compounds represented by formulas (L-2.1) to (L-2.6), and is preferably a compound represented by formula (L-2.1), formula (L-2.3), formula (L-2.4), or formula (L-2.6).

[0157] [ka]

[0158] With respect to the total amount of the liquid crystal composition of the present invention, the lower limit of the preferable content of each compound or the total of the compounds represented by the formulas (L-2.1) to (L-2.6) is 0% by mass, 1% by mass, or 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferable content is 7% by mass, 5% by mass, or 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0159] The compound represented by the general formula (L) is preferably a compound selected from the group of compounds represented by the general formula (L-6).

[0160] The compound represented by the general formula (L-6) is the following compound.

[0161]

Chemical formula

[0162] (In the formula, R L61 and R L62 each independently represents an alkyl group having 1 to 10 carbon atoms, and one or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. X L61 and X L62 each independently represents a hydrogen atom or a fluorine atom.) R L61 and R L62 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably one of X L61 and X L62 is a fluorine atom and the other is a hydrogen atom.

[0163] The compound represented by the general formula (L-6) can be used alone or in combination of two or more compounds. There are no particular restrictions on the types of compounds that can be combined, but they are appropriately combined and used according to the required performance such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. The number of types of compounds to be used is, for example, one type, two types, three types, four types, or five or more types as one embodiment of the present invention.

[0164] The lower limit of the preferred content of the total compound represented by the formula (L-6) with respect to the total amount of the liquid crystal composition of the present invention is 0% by mass, 1% by mass, or 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 7% by mass, 5% by mass, or 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0165] The compound represented by the general formula (L-6) is preferably a compound represented by the formula (L-6.1) to the formula (L-6.9).

[0166]

Chemical formula

[0167] There are no particular restrictions on the types of compounds that can be combined, but it is preferable to contain 1 to 3 types, and more preferably 1 to 4 types, of these compounds. Also, since a wide molecular weight distribution of the selected compounds is also effective for solubility, for example, one type from the compounds represented by the formula (L-6.1) or (L-6.2), one type from the compounds represented by the formula (L-6.4) or (L-6.5), one type from the compounds represented by the formula (L-6.6) or the formula (L-6.7), and one type from the compounds represented by the formula (L-6.8) or (L-6.9) are selected and appropriately combined. Among them, it is preferable to contain the compounds represented by the formula (L-6.1), the formula (L-6.3), the formula (L-6.4), the formula (L-6.6), and the formula (L-6.9).

[0168] With respect to the total amount of the liquid crystal composition of the present invention, the lower limit of the preferable content of each compound or the total of the compounds represented by the formulas (L-6.1) to (L-6.9) is 0% by mass, 1% by mass, and 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferable content is 7% by mass, 5% by mass, and 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0169] Furthermore, the compound represented by the general formula (L-6) is preferably a compound represented by the formulas (L-6.10) to (L-6.17), and among them, the compound represented by the formula (L-6.11) is preferable.

[0170]

Chemical formula

[0171] With respect to the total amount of the liquid crystal composition of the present invention, the lower limit of the preferable content of each compound or the total of the compounds represented by the formulas (L-6.10) to (L-6.17) is 0% by mass, 1% by mass, and 2% by mass with respect to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferable content is 7% by mass, 5% by mass, and 3% by mass with respect to the total amount of the liquid crystal composition of the present invention.

[0172] The compound represented by the general formula (L) is preferably a compound selected from the group of compounds represented by the general formula (L-7).

[0173] The compound represented by the general formula (L-7) is the following compound.

[0174]

Chemical formula

[0175] (In the formula, R L71 and R L72each independently represents an alkyl group having 1 to 10 carbon atoms, in which one or two or more non-adjacent -CH2- groups may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -COO-, or -OCO-; A L71 and A L72 each independently represents a group selected from the group consisting of: (a) a 1,4-cyclohexylene group (in which one -CH2- or two or more non-adjacent -CH2- groups may be replaced with -O-), (b) a 1,4-phenylene group (in which one -CH= or two or more non-adjacent -CH= groups may be replaced with -N=), and (c) a naphthalene-2,6-diyl group, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, or a decahydronaphthalene-2,6-diyl group (in which one -CH= or two or more non-adjacent -CH= groups may be replaced with -N=), and Z L71 represents a single bond, -CH2CH2-, -(CH2)4-, -OCH2-, -CHO-, -COO-, -OCO-, -OCF2-, -CF2O-, -CH=NN=CH-, -CH=CH-, -CF=CF- or -C≡C-; X L71 and X L72 represents a hydrogen atom.) In the formula, R L71 and R L72 are each independently preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; L71 and A L72 are each independently preferably a 1,4-cyclohexylene group or a 1,4-phenylene group, and A L71 and A L72 Each of the hydrogen atoms may be independently replaced by a fluorine atom; Z L71 is preferably a single bond or COO—, and more preferably a single bond.

[0176] There is no particular limitation on the types of compounds that can be combined, but they are combined depending on the required performance, such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. In one embodiment of the present invention, the types of compounds used may be one, two, three, or four, for example.

[0177] In the composition of the present invention, the content of the compound represented by general formula (L-7) needs to be appropriately adjusted depending on the required performance, such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, process compatibility, drop marks, burn-in, and dielectric anisotropy.

[0178] The preferred lower limit of the content of the compound represented by general formula (L-7) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, or 2 mass%, and the preferred upper limit of the content is 7 mass%, 5 mass%, or 3 mass%, relative to the total amount of the liquid crystal composition of the present invention.

[0179] When a liquid crystal composition of the present invention is desired to have a high Tni, it is preferable to increase the content of the compound represented by formula (L-7), and when a liquid crystal composition of the present invention is desired to have a low viscosity, it is preferable to decrease the content.

[0180] Furthermore, the compound represented by general formula (L-7) is preferably a compound represented by formula (L-7.1) to formula (L-7.4), and more preferably a compound represented by formula (L-7.2).

[0181] [ka]

[0182] The preferred lower limit of the content of each of the compounds represented by formulas (L-7.1) to (L-7.4) or the total content of the compounds relative to the total amount of the liquid crystal composition of the present invention is 0 mass %, 1 mass %, or 2 mass %, and the preferred upper limit of the content is 7 mass %, 5 mass %, or 3 mass %, relative to the total amount of the liquid crystal composition of the present invention.

[0183] In the liquid crystal composition of the present invention, the content of the compounds represented by general formulas (N-1-1), (N-1-2), and (N-1-3) relative to the total amount of the liquid crystal composition of the present invention is preferably 25% by mass or more, more preferably 28% by mass or more, more preferably 30% by mass or more, more preferably 33% by mass or more, more preferably 35% by mass or more, and more preferably 38% by mass or more. The upper limit is preferably 70% by mass or less, more preferably 68% by mass or less, more preferably 65% by mass or less, more preferably 63% by mass or less, more preferably 60% by mass or less, more preferably 55% by mass or less, and more preferably 50% by mass or less.

[0184] In the liquid crystal composition of the present invention, the content of the compounds represented by general formulas (N-1-1), (N-1-2), (N-1-3), (N-1-4-1), and (N-1-4-2) is preferably 25% by mass or more, more preferably 28% by mass or more, more preferably 30% by mass or more, more preferably 33% by mass or more, more preferably 35% by mass or more, and more preferably 38% by mass or more, relative to the total amount of the liquid crystal composition of the present invention. The upper limit is preferably 70% by mass or less, more preferably 68% by mass or less, more preferably 65% by mass or less, more preferably 63% by mass or less, more preferably 60% by mass or less, more preferably 55% by mass or less, and more preferably 50% by mass or less.

[0185] In the liquid crystal composition of the present invention, the content of the compounds represented by formula (ii-1.22), formula (ii-1.13), general formula (L-4), and general formula (L-5) is preferably 20% by mass or more, more preferably 25% by mass or more, more preferably 28% by mass or more, more preferably 30% by mass or more, more preferably 33% by mass or more, and more preferably 34% by mass or more, relative to the total amount of the liquid crystal composition of the present invention. The upper limit is preferably 50% by mass or less, more preferably 45% by mass or less, more preferably 42% by mass or less, more preferably 40% by mass or less, more preferably 38% by mass or less, and more preferably 36% by mass or less.

[0186] In the liquid crystal composition of the present invention, it is preferable from the viewpoint of reducing flicker to use a compound represented by formula (N-1-1.1) as a compound represented by general formula (N-1-1) in combination as an essential compound with each of the compounds represented by general formula (N-1-2), general formula (N-1-3), general formula (N-1-4-1), general formula (N-1-4-2), formula (ii-1.22), and formula (ii-1.13), and a compound represented by general formula (L-4) and / or general formula (L-5).

[0187] In the liquid crystal composition of the present invention, it is preferable to use a compound represented by formula (N-1-1), (N-1-3), (N-1-4-1), (N-1-4-2), (ii-1.22), or (ii-1.13), and a compound represented by formula (L-4) and / or (L-5), together with a compound represented by formula (N-1-2.4) as a compound represented by formula (N-1-2), in combination as an essential compound, from the viewpoint of reducing flicker. Here, as the compound represented by formula (L-4) and / or (L-5), it is preferable to use one, two, or three compounds represented by formula (L-4.4), formula (L-5.1), or formula (L-5.2).

[0188] In the liquid crystal composition of the present invention, it is preferable from the viewpoint of flicker reduction to use, in combination, a compound represented by each of general formula (N-1-1), general formula (N-1-2), general formula (N-1-3), general formula (N-1-4-1), general formula (N-1-4-2), formula (ii-1.22), and formula (ii-1.13), and a compound represented by general formula (N-1-3) together with a compound represented by general formula (L-4) and / or general formula (L-5) as an essential compound. Here, as the compound represented by general formula (L-4) and / or general formula (L-5), it is preferable to use one or two or three compounds selected from the compounds represented by formula (L-4.4), formula (L-5.1), and formula (L-5.2).

[0189] In the liquid crystal composition of the present invention, it is preferable from the viewpoint of flicker reduction to use, as essential compounds, a compound represented by formula (N-1-1.1) as the compound represented by general formula (N-1-1), a compound represented by formula (N-1-2.4) as the compound represented by general formula (N-1-2), in combination with a compound represented by each of general formula (N-1-3), general formula (N-1-4-1), general formula (N-1-4-2), formula (ii-1.22), and formula (ii-1.13), and a compound represented by general formula (L-4) and / or general formula (L-5). Here, as the compound represented by general formula (L-4) and / or general formula (L-5), it is preferable to use one or two or three compounds selected from the compounds represented by formula (L-4.4), formula (L-5.1), and formula (L-5.2).

[0190] In the liquid crystal composition of the present invention, a compound represented by each of general formula (N-1-2), general formula (N-1-4-1), general formula (N-1-4-2), formula (ii-1.22), and formula (ii-1.13), and a compound represented by general formula (L-4) and / or general formula (L-5) are used together with a compound represented by general formula (N-1-1) as a compound represented by formula (N-1-1.1) as an essential compound, and a compound represented by general formula (N-1-3) is used as a compound represented by formula (N-1-3.2) as an essential compound, and using these in combination is preferable from the viewpoint of flicker reduction. Here, as the compound represented by general formula (L-4) and / or general formula (L-5), it is preferable to use one or two or three compounds represented by formula (L-4.4), formula (L-5.1), and formula (L-5.2).

[0191] In the liquid crystal composition of the present invention, the total content of the compounds represented by general formula (N-1-1), general formula (N-1-2), general formula (N-1-3), general formula (N-1-4-1), general formula (N-1-4-2), formula (ii-1.22), formula (ii-1.13), general formula (L-4), and general formula (L-5) is preferably 60% by mass or more, preferably 63% by mass or more, preferably 65% by mass or more, preferably 68% by mass or more, preferably 70% by mass or more, preferably 72% by mass or more as a lower limit value with respect to the total amount of the liquid crystal composition of the present invention. Further, as an upper limit value, it is preferably 100% by mass or less, preferably 98% by mass or less, preferably 95% by mass or less, preferably 90% by mass or less, preferably 85% by mass or less, preferably 82% by mass or less.

[0192] The liquid crystal composition of the present invention has a refractive index anisotropy (Δn) at 20°C of 0.08 to 0.14, more preferably 0.09 to 0.13, and particularly preferably 0.09 to 0.12. More specifically, when corresponding to a thin cell gap, it is preferably 0.10 to 0.13, and when corresponding to a thick cell gap, it is preferably 0.08 to 0.10.

[0193] The liquid crystal composition of the present invention has a viscosity (η) at 20°C of 10 to 30 mPa·s, more preferably 10 to 25 mPa·s, and particularly preferably 10 to 22 mPa·s.

[0194] The liquid crystal composition of the present invention has a rotational viscosity (γ1) at 20°C of 60 to 200 mPa·s, more preferably 60 to 120 mPa·s, and particularly preferably 60 to 100 mPa·s.

[0195] The liquid crystal composition of the present invention has a nematic phase-isotropic liquid phase transition temperature (T ni ) of 60°C to 120°C, more preferably 70°C to 100°C, and particularly preferably 70°C to 85°C.

[0196] In addition to the above-mentioned compounds, the liquid crystal composition of the present invention may contain ordinary nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers, or light stabilizers, etc.

[0197] The liquid crystal display element using the liquid crystal composition of the present invention is a lateral electric field mode display element that utilizes an electric field generated in the horizontal direction with respect to a substrate in an FFS mode or an IPS mode, etc. Hereinafter, examples of liquid crystal display elements in the FFS mode and the IPS mode will be described with reference to FIGS. 1 to 7.

[0198] FIG. 1 is a diagram schematically showing the configuration of a liquid crystal display element. In FIG. 1, for the sake of explanation, each component is described separately for convenience. The configuration of the liquid crystal display element 10 according to the present invention is, as shown in FIG. 1, an FFS-mode liquid crystal display element having a liquid crystal composition (or liquid crystal layer 5) sandwiched between a first transparent insulating substrate 2 and a second transparent insulating substrate 7 arranged opposite to each other, characterized in that the liquid crystal composition of the present invention is used as the liquid crystal composition. An electrode layer 3 is formed on the surface of the first transparent insulating substrate 2 on the side of the liquid crystal layer 5. Further, between the liquid crystal layer 5 and each of the first transparent insulating substrate 2 and the second transparent insulating substrate 7, there is a pair of alignment films 4 that directly contact the liquid crystal composition constituting the liquid crystal layer 5 to induce homogeneous alignment, and the liquid crystal molecules in the liquid crystal composition are aligned so as to be substantially parallel to the substrates 2 and 7 when no voltage is applied. As shown in FIGS. 1 and 3, the first substrate 2 and the second substrate 7 may be sandwiched between a pair of polarizing plates 1 and 8. Further, in FIG. 1, a color filter 6 is provided between the second substrate 7 and the alignment film 4.

[0199] That is, the liquid crystal display element 10 according to the present invention has a configuration in which a first polarizing plate 1, a first substrate 2, an electrode layer 3 including a thin film transistor, an alignment film 4, a liquid crystal layer 5 including a liquid crystal composition, an alignment film 4, a color filter 6, a second substrate 7, and a second polarizing plate 8 are sequentially laminated. The first substrate 2 and the second substrate 7 can be made of a flexible transparent material such as glass or plastic, and one of them may be an opaque material such as silicon. The two substrates 2 and 7 are bonded together by a sealing material and a sealing agent such as an epoxy-based thermosetting composition arranged in the peripheral region, and between them, for example, granular spacers such as glass particles, plastic particles, alumina particles, or spacer pillars made of resin formed by photolithography may be arranged to maintain the distance between the substrates.

[0200] Fig. 2 is an enlarged plan view of the region surrounded by line II of the electrode layer 3 formed on the substrate 2 in Fig. 1. Fig. 3 is a cross-sectional view of the liquid crystal display element shown in Fig. 1 taken along line III-III in Fig. 2. As shown in Fig. 2, the electrode layer 3 including thin film transistors formed on the surface of the first substrate 2 has a plurality of gate bus lines 26 for supplying scanning signals and a plurality of data bus lines 25 for supplying display signals, which are arranged in a matrix pattern and cross each other. Note that Fig. 2 shows only one pair of gate bus lines 25 and one pair of data bus lines 24.

[0201] A unit pixel of the liquid crystal display device is formed by an area surrounded by a plurality of gate bus lines 26 and a plurality of data bus lines 25, and a pixel electrode 21 and a common electrode 22 are formed within the unit pixel. A thin-film transistor including a source electrode 27, a drain electrode 24, and a gate electrode 28 is provided near the intersection where the gate bus lines 26 and the data bus lines 25 intersect with each other. This thin-film transistor is connected to the pixel electrode 21 as a switching element for supplying a display signal to the pixel electrode 21. In addition, a common line 29 is provided in parallel to the gate bus lines 26. This common line 29 is connected to the common electrode 22 to supply a common signal to the common electrode 22.

[0202] 3, a preferred embodiment of the thin film transistor structure includes a gate electrode 11 formed on the surface of a substrate 2, a gate insulating layer 12 covering the gate electrode 11 and substantially covering the entire surface of the substrate 2, a semiconductor layer 13 formed on the surface of the gate insulating layer 12 so as to face the gate electrode 11, a protective film 14 covering a portion of the surface of the semiconductor layer 17, a drain electrode 16 covering one side end of the protective layer 14 and the semiconductor layer 13 and in contact with the gate insulating layer 12 formed on the surface of the substrate 2, a source electrode 17 covering the other side end of the protective film 14 and the semiconductor layer 13 and in contact with the gate insulating layer 12 formed on the surface of the substrate 2, and an insulating protective layer 18 covering the drain electrode 16 and the source electrode 17. An anodic oxide film (not shown) may be formed on the surface of the gate electrode 11 to eliminate any step between the gate electrode and the gate electrode, for example.

[0203] The semiconductor layer 13 can be made of amorphous silicon, polycrystalline polysilicon, or the like. However, using a transparent semiconductor film such as ZnO, IGZO (In-Ga-Zn-O), or ITO can suppress the adverse effects of photocarriers caused by light absorption, and is also preferable from the viewpoint of increasing the aperture ratio of the element.

[0204] Furthermore, in order to reduce the width or height of the Schottky barrier, an ohmic contact layer 15 may be provided between the semiconductor layer 13 and the drain electrode 16 or the source electrode 17. For the ohmic contact layer, a material containing a high concentration of impurities such as phosphorus, such as n-type amorphous silicon or n-type polycrystalline polysilicon, can be used.

[0205] The gate bus lines 26, data bus lines 25, and common lines 29 are preferably metal films, more preferably Al, Cu, Au, Ag, Cr, Ta, Ti, Mo, W, Ni, or alloys thereof, and particularly preferably Al or alloys thereof. The insulating protective layer 18 is a layer having an insulating function and is formed of silicon nitride, silicon dioxide, silicon oxynitride, or the like.

[0206] In the embodiments shown in FIGS. 2 and 3, the common electrode 22 is a flat electrode formed on substantially the entire surface of the gate insulating layer 12. On the other hand, the pixel electrode 21 is a comb-shaped electrode formed on the insulating protective layer 18 covering the common electrode 22. That is, the common electrode 22 is disposed closer to the first substrate 2 than the pixel electrode 21, and these electrodes are arranged to overlap each other with the insulating protective layer 18 therebetween. The pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IZTO (Indium Zinc Tin Oxide), etc. Since the pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material, the area opened per unit pixel area becomes large, and the aperture ratio and the transmittance increase.

[0207] The pixel electrode 21 and the common electrode 22 are formed such that the horizontal electrode distance: R between the pixel electrode 21 and the common electrode 22 is smaller than the distance: G between the first substrate 2 and the second substrate 7 in order to form a fringe electric field between these electrodes. Here, the electrode distance: R represents the horizontal distance on the substrate between the electrodes. In FIG. 3, since the flat common electrode 22 and the comb-shaped pixel electrode 21 overlap, an example where the electrode distance: R = 0 is shown. Since the electrode distance: R is smaller than the distance between the first substrate 2 and the second substrate 7 (i.e., the cell gap): G, a fringe electric field E is formed. Therefore, the FFS type liquid crystal display element can utilize a horizontal electric field (transverse electric field) formed in a direction perpendicular to the lines forming the comb shape of the pixel electrode 21 and a parabolic electric field. The electrode width: l of the comb-shaped portion of the pixel electrode 21 and the width: m of the gap between the comb-shaped portions of the pixel electrode 21 are preferably formed to be widths such that all the liquid crystal molecules in the liquid crystal layer 5 can be driven by the generated electric field.

[0208] From the viewpoint of preventing light leakage, it is preferable to form a black matrix (not shown) in a portion corresponding to the thin film transistor and the storage capacitor 23 in the color filter 6.

[0209] On the electrode layer 3 and the color filter 6, a pair of alignment films 4 that directly contact the liquid crystal composition constituting the liquid crystal layer 5 and induce homogeneous alignment are provided. The alignment film 4 is, for example, a rubbed polyimide film, and the alignment directions of the respective alignment films are parallel. Here, with reference to FIG. 4, the rubbing direction (alignment direction of the liquid crystal composition) of the alignment film 4 in the present embodiment will be described. FIG. 4 is a diagram schematically showing the alignment direction of the liquid crystal induced by the alignment film 4. In the present invention, a liquid crystal composition having a negative dielectric anisotropy is used. Therefore, when the direction perpendicular to the line forming the comb shape of the pixel electrode 21 (the direction in which a horizontal electric field is formed) is defined as the x-axis, it is preferable that the angle θ formed by the x-axis and the major axis direction of the liquid crystal molecules 30 is generally 0 to 45°. In the example shown in FIG. 3, an example in which the angle θ formed by the x-axis and the major axis direction of the liquid crystal molecules 30 is generally 0° is shown. Inducing the alignment direction of the liquid crystal in this way is to increase the maximum transmittance of the liquid crystal display device.

[0210] Also, the polarizing plate 1 and the polarizing plate 8 can be adjusted by adjusting the polarization axes of the respective polarizing plates so that the viewing angle and contrast are improved, and it is preferable that they have transmission axes perpendicular to each other so that their transmission axes operate in the normally black mode. In particular, it is preferable to arrange one of the polarizing plate 1 and the polarizing plate 8 so as to have a transmission axis parallel to the alignment direction of the liquid crystal molecules 30. Also, it is preferable to adjust the product of the refractive index anisotropy Δn of the liquid crystal and the cell thickness d so that the contrast is maximized. Furthermore, a retardation film for widening the viewing angle can also be used.

[0211] In the FFS mode liquid crystal display device 10 configured as described above, a fringe electric field is generated between the pixel electrode 21 and the common electrode 22 by supplying an image signal (voltage) to the pixel electrode 21 via the thin-film TFT, and this electric field drives the liquid crystal. That is, when no voltage is applied, the liquid crystal molecules 30 are aligned so that their long axes are parallel to the alignment direction of the alignment film 4. When a voltage is applied, equipotential lines of a parabolic electric field are formed between the pixel electrode 21 and the common electrode 22 up to the top of the pixel electrode 21 and the common electrode 22, and the liquid crystal molecules 30 in the liquid crystal layer 5 rotate within the liquid crystal layer 5 along the formed electric field. In the present invention, liquid crystal molecules 30 having negative dielectric anisotropy are used, so that the long axes of the liquid crystal molecules 30 rotate so that they are perpendicular to the direction of the generated electric field. Although the liquid crystal molecules 30 located near the pixel electrode 21 are susceptible to the influence of the fringe electric field, the liquid crystal molecules 30 with negative dielectric anisotropy have their polarization direction along the minor axis of the molecule, and therefore their major axis direction does not rotate in a direction perpendicular to the alignment film 4, and the major axes of all the liquid crystal molecules 30 in the liquid crystal layer 5 can remain parallel to the alignment film 4. Therefore, superior transmittance characteristics can be obtained compared to an FFS-type liquid crystal display element using liquid crystal molecules 30 with positive dielectric anisotropy.

[0212] The FFS mode liquid crystal display element described with reference to Figures 1 to 4 is merely an example, and various other forms are possible without departing from the technical spirit of the present invention. For example, Figure 5 is another example of an enlarged plan view of the area surrounded by line II of the electrode layer 3 formed on the substrate 2 in Figure 1. As shown in Figure 5, the pixel electrode 21 may have a slit. The slit pattern may also be formed so as to have an inclination angle with respect to the gate bus lines 26 or the data bus lines 25.

[0213] FIG. 6 is another example of a cross-sectional view of the liquid crystal display element shown in FIG. 1 cut along the line III-III in FIG. 2. In the example shown in FIG. 6, a common electrode 22 having a comb shape or a slit is used, and the electrode distance between the pixel electrode 21 and the common electrode 22 is R = α. Further, in FIG. 3, an example in which the common electrode 22 is formed on the gate insulating film 12 is shown. However, as shown in FIG. 6, the common electrode 22 may be formed on the first substrate 2, and the pixel electrode 21 may be provided via the gate insulating film 12. The electrode width l of the pixel electrode 21, the electrode width n of the common electrode 22, and the electrode distance R are preferably adjusted appropriately to a width such that all the liquid crystal molecules in the liquid crystal layer 5 can be driven by the generated electric field.

[0214] In the liquid crystal display element of the IPS mode, the horizontal electrode distance R between the pixel electrode and the common electrode is formed to be smaller than the distance G between the opposing first substrate and the second substrate. Therefore, in the liquid crystal display element of the IPS mode, the pixel electrode may be provided closer to the liquid crystal layer side than the common electrode as shown in FIG. 6, or the pixel electrode 41 and the common electrode 42 may be provided in a state of being separated and meshed on the same plane as shown in FIG. 7.

[0215] When the liquid crystal composition of the present invention is applied to a horizontal electric field type display element such as the FFS mode or the IPS mode, the contrast is improved. This is because when a liquid crystal composition having a negative Δη is applied to a horizontal electric field type liquid crystal display element, the liquid crystal molecules are aligned parallel to the substrate surface using an alignment film or the like that induces a homogeneous alignment. However, when the liquid crystal composition is used, it is considered that the fluctuation of the alignment of the liquid crystal molecules is reduced. That is, when the liquid crystal composition of the present invention is used, the alignment order of the liquid crystal molecules is maintained. As a result, the blackening of the display element is excellent and the contrast is improved. It is speculated that this effect is contributed by the high elastic constant inherent to the liquid crystal composition.

Example

[0216] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Furthermore, "%" in the compositions of the following examples and comparative examples means "% by mass."

[0217] In the examples, the following abbreviations are used to describe compounds, where n represents a natural number. (side chain) -n -C n H 2n+1 A straight-chain alkyl group with n carbon atoms n-C n H 2n+1 - a linear alkyl group with n carbon atoms -On -OC n H 2n+1 A straight-chain alkoxy group with n carbon atoms nO-C n H 2n+1 O- A straight-chain alkoxyl group with n carbon atoms -V -CH=CH2 V- CH2=CH- -V1 -CH=CH-CH3 1V- CH3-CH=CH- -2V -CH2-CH2-CH=CH3 V2- CH2=CH-CH2-CH2- -2V1 -CH2-CH2-CH=CH-CH3 1V2- CH3-CH=CH-CH2-CH2- (linking group) -n- -C n H 2n - -nO- -C n H 2n -O- -On- -OC n H 2n - -COO- -C(=O)-O- -OCO- -OC(=O)- (ring structure)

[0218] [ka]

[0219] In the examples, the measured properties are as follows:

[0220] T ni : Nematic-isotropic liquid phase transition temperature (℃) Δn: Refractive index anisotropy at 25°C γ1: Rotational viscosity at 25°C (mPa·s) K11: Elastic constant K11 (pN) at 20°C K33: Elastic constant K33 (pN) at 20°C Δε: Dielectric anisotropy at 25°C The liquid crystal compositions of Examples 1 to 4 and Comparative Examples 1 to 4 were injected into FFS cells to obtain FFS elements, and voltage-transmittance characteristics were measured by applying square waves of 1 kHz and 30 Hz. [Flicker rating] The transmittance at a low frequency of 30 Hz changes depending on flicker, and poor flicker reduces the transmittance. On the other hand, the transmittance at a high frequency of 1 kHz is less affected by flicker. Therefore, flicker was evaluated as the ratio of 1 kHz transmittance to 30 Hz transmittance. The smaller the value, the more effectively the flicker was reduced. ◎...1kHz transmittance / 30Hz transmittance<1.01 〇...1.01≦1kHz transmittance / 30Hz transmittance<1.02 △...1.02≦1kHz transmittance / 30Hz transmittance<1.03 ×...1.03≦1kHz transmittance / 30Hz transmittance<1.05

[0221] [Table 1]

[0222] [Table 2]

[0223] [Table 3]

[0224] [Table 4]

[0225] Comparing the above Examples 1 to 4 with Comparative Examples 1 to 4, it became clear that the liquid crystal display element using the specific liquid crystal composition of the present invention had good response performance and suppressed or reduced flicker. [Explanation of symbols]

[0226] 1,8 Polarizing plate 2 First board 3 electrode layer 4. Orientation film 5 Liquid crystal layer 6 Color Filters 7 Second board 11 Gate electrode 12 Gate insulating film 13 Semiconductor layer 14 Insulating layer 15 Ohmic contact layer 16 Drain electrode 17 Source electrode 18 Insulating protective layer 21 pixel electrode 22 Common electrode 23 Storage Capacitor 25 data bus lines 27 Source Bus Line 29 Common Line

Claims

1. A first substrate and a second substrate arranged opposite to each other, a liquid crystal layer containing a liquid crystal composition sandwiched between the first substrate and the second substrate, a first electrode provided on the first substrate, a second electrode provided on the first substrate and generating an electric field between the second electrode and the first electrode, wherein the liquid crystal composition contains one compound represented by the general formula (N-1-1) 【Chemical 1】 (wherein R Ｎ１１１ and R Ｎ１１２ each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH ２ - may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-.) contains one kind of compound represented by the formula, and the content thereof is 13% by mass or more and 17% by mass or less based on the total amount of the liquid crystal composition, and the general formula (N-1-2) 【Chemical Formula 2】 (In the formula, R Ｎ１２１ and R Ｎ１２２ each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH ２ - may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-. ) and the content thereof is 19% by mass or more and 23% by mass or less based on the total amount of the liquid crystal composition, contains a compound represented by the general formula (N-1-3) [Chemical Formula 3] (wherein, R Ｎ１３１ and R Ｎ１３２ each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent -CH ２ - may each independently be substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-).) contains one kind of the compound represented by and a compound represented by the formula (ii-1.22) [Chemical Formula 4] contains a compound represented by the formula (ii-1.13) and, and [Chemical Formula 5] contains one or more compounds selected from the group of compounds represented by the general formula (L-4) or the general formula (L-5) wherein the liquid crystal composition further contains one or more compounds selected from the group of compounds represented by the general formula (N-1-4-1) and / or the general formula (N-1-4- 【Chemical Formula 6】 (wherein R Ｌ４１ , R Ｌ４２ , R Ｌ５１ and R Ｌ５２ each independently represents an alkyl group having 1 to 8 carbon atoms.) wherein the liquid crystal composition consists of only one compound represented by the general formula (N-1-1), one compound represented by the general formula (N-1-2), one compound represented by the general formula (N-1-3), and one or more compounds selected from the group of compounds represented by the general formula (N-1-4-1) and / or the general formula (N-1-4-2) as a compound having a dielectric anisotropy (measured at 25 ° C.) greater than -2, wherein the compound represented by the general formula (N-1-1) is a compound selected from the group of compounds represented by the formula (N-1-1.1) to the formula (N-1 ２） [Chemical Formula 7] (wherein R １４１１ , R １４１２ , R １４２１ and R １４２２ each independently represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms or an alkenyloxy group having 2 to 8 carbon atoms, and ring A is a 1,4-cyclohexylene group (one —CH ２ — or two or more non-adjacent —CH ２ — in this group may be replaced by —O—.), or a 1,4-phenylene group (one —CH═ or two or more non-adjacent —CH═ in this group may be replaced by —N═.), and among X １２４１ and X １２４２ , one represents a fluorine atom, while the other represents a hydrogen atom.) wherein the compound represented by the general formula (N-1-2) is a compound selected from the group of compounds represented by the formula (N-1-2.1) to the formula (N-1 wherein the compound represented by the general formula (N-1-3) is a compound selected from the group of compounds represented by the formula (N-1-3.1) to the formula (N-1-3.8) wherein the compound represented by the general formula (N-1-4-1) is a compound selected from the group of compounds represented by the formula (N-1-4-1.1) to the formula (N-1-4-1.8) －１．８） 【Chemical 8】 wherein the compound represented by the general formula (N-1-4-2) is a compound selected from the group of compounds represented by the formula (N-1-4-2.1) to (N-1-4-2.4) wherein the content of the compound represented by the general formula (N-1-3) is 10 －２．１１） 【Chemical Formula 9】 % by mass or more and 11% by mass or less based on the total amount of the liquid crystal composition, wherein the content of the compound represented by the general formula (ii-1.22) is based on the total amount of the liquid crystal composition ​ 【Chemical 10】 ​ ​ ​ 【Chemical Formula 11】 ​ ​ ​ 【Chemical Formula 12】 ​ ​ ​ ​ is 22% by mass or more and 29% by mass or less, the content of the compound represented by the general formula (ii-1.13) is with respect to the total amount of the liquid crystal composition 10% by mass or more and 11% by mass or less, the content of the compound represented by the general formula (L-4) is 8% by mass with respect to the total amount of the liquid crystal composition or more and 11% by mass or less, the content of the compound represented by the general formula (L-5) is 9% by mass with respect to the total amount of the liquid crystal composition or more and 10% by mass or less, the content of the compound represented by the general formula (N-1-4-1) is with respect to the total amount of the liquid crystal composition 3% by mass or more and 5% by mass or less, the content of the compound represented by the general formula (N-1-4-2) is with respect to the total amount of the liquid crystal composition a liquid crystal display element that is 0% by mass or more and 5% by mass or less.

2. The liquid crystal display element according to claim 1 for an FFS mode.

3. The liquid crystal display element according to claim 1 for an IPS mode.

4. The liquid crystal composition according to claim 1.

Images