Liquid crystal composition and liquid crystal display element

Abstract

The present invention relates to a liquid crystal composition and a liquid crystal display element that are effectively used as a structural member of a liquid crystal display device, etc. That is, a liquid crystal display element is provided, comprising: a first substrate and a second substrate, the first substrate and the second substrate are arranged opposite to each other; a liquid crystal layer, sandwiched between the first substrate and the second substrate and containing a liquid crystal composition; a first electrode, disposed on the first substrate; and a second electrode, disposed on the first substrate, generating an electric field between the first electrode and the liquid crystal composition, wherein the liquid crystal composition contains a specific compound.

Description

Technical Field

[0001] The present invention relates to a liquid crystal composition and a liquid crystal display element which are effectively used as a structural member of a liquid crystal display device or the like. Background Art

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

[0003] Among these, as liquid crystal displays for smartphones and input boards, IPS mode or FFS mode liquid crystal display devices with high quality and excellent visual characteristics are widely used. IPS mode or FFS mode is a lateral electric field mode using an electric field generated in the horizontal direction relative to the substrate, and a liquid crystal material that can display a negative value of Δε can be used. As a liquid crystal material in which Δε is negative and its absolute value is large, for example, a liquid crystal composition using the following compound (A), compound (B) and compound (C) is known (see patent document 1).

[0004] [Chemistry 1]

[0005]

[0006] The IPS mode and the FFS mode require a liquid crystal display element that can respond at a high speed and be driven at a low voltage, similar to other driving methods.

[0007] Among them, as a theme of low-voltage driving, liquid crystal display elements driven by low power consumption have attracted attention due to the recent social situation of energy conservation and the popularization of smart phones. At present, as a means to achieve low power consumption, low-frequency driving that reduces the driving frequency of liquid crystal display elements compared to the standard state, or intermittent driving that sets a rest period after writing during one frame period is proposed. However, when switching from the writing period to the rest period, the voltage changes greatly and the pixel potential changes greatly. Therefore, it is confirmed that: due to the increase in the difference between the display brightness during the rest period and the display brightness during the writing period of the next frame period, flickering occurs, especially when switching between frames, resulting in a problem of reduced display quality.

[0008] As one of the causes of this flicker, it is believed to be related to the flicker caused by the flexible polarization of the liquid crystal molecules. Specifically, if a liquid crystal display element applies a DC voltage to the liquid crystal layer for a long time, the display characteristics will change over time due to charging, so it is generally driven by reversing the positive and negative polarities for each frame. It is ideal to control the orientation state of the liquid crystal molecules based only on the potential difference between the pixel electrode and the opposing electrode, but in fact, due to the strong electric field acting on the end of the pixel electrode, the liquid crystal molecules are reversed. When the polarity of the electric field is reversed, the polarization (flexible polarization) will react instantly, so flickering will occur due to brightness changes.

[0009] 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 below) (polar component) and a compound with neutral dielectric anisotropy (non-polar component), and the liquid crystal composition as a whole contains several to dozens of liquid crystal compounds. Therefore, the liquid crystal compound that actually contributes to flexible polarization is a compound with negative dielectric anisotropy (polar component) that is part of the liquid crystal composition. Therefore, the current situation is that the polarization of the liquid crystal molecules constituting the liquid crystal layer cannot be averaged according to theory, and the effect of reducing and suppressing flicker cannot be exerted.

[0010] [Prior art literature]

[0011] [Patent Document]

[0012] [Patent Document 1] International Publication No. 2010 / 084823 Summary of the invention

[0013] [Problems to be solved by the invention]

[0014] Therefore, an object of the present invention is to achieve both high-speed response and reduction and suppression of flicker by a liquid crystal display element including a liquid crystal layer using a liquid crystal composition containing a specific liquid crystal compound showing negative dielectric anisotropy.

[0015] [Technical means to solve the problem]

[0016] The present inventors studied the structures of various liquid crystal compositions to solve the above problems and found that the above problems can be solved by using an FFS mode or IPS mode liquid crystal display element using a specific liquid crystal composition, thereby completing the present invention.

[0017] The present invention provides a liquid crystal display element having:

[0018] A first substrate and a second substrate, wherein the first substrate and the second substrate are arranged facing each other;

[0019] a liquid crystal layer, sandwiched between the first substrate and the second substrate and containing a liquid crystal composition;

[0020] A first electrode is disposed on the first substrate; and

[0021] A second electrode is disposed on the first substrate and generates an electric field with the first electrode.

[0022] The liquid crystal composition

[0023] Contains a general formula (N-1-1)

[0024] [Chemistry 2]

[0025]

[0026] (Where R N111 and R N112 A compound represented by each independently representing an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group are independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-), wherein the content thereof is 10% by mass or more relative to the total amount of the liquid crystal composition,

[0027] Contains a general formula (N-1-2)

[0028] [Chemistry 3]

[0029]

[0030] (Where R N121 and R N122 A compound represented by each independently representing an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group are independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-), wherein the content thereof is 10% by mass or more relative to the total amount of the liquid crystal composition,

[0031] Contains a general formula (N-1-3)

[0032] [Chemistry 4]

[0033]

[0034] (Where R N131 and R N132 each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group are independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-),

[0035] Containing formula (ii-1.22)

[0036] [Chemistry 5]

[0037]

[0038] The compounds represented by

[0039] Containing formula (ii-1.13)

[0040] [Chemistry 6]

[0041]

[0042] The compound represented by

[0043] Containing one or more selected from the general formula (L-4) and / or the general formula (L-5)

[0044] [Chemistry 7]

[0045]

[0046] (Where R L51 and R L52 Each independently represents an alkyl group having 1 to 8 carbon atoms, and one or more non-adjacent -CH2- in the alkyl group are each independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-).

[0047] The invention of the present application provides a liquid crystal composition, which is the liquid crystal composition described above.

[0048] [Effects of the Invention]

[0049] The liquid crystal display element of the present invention is a liquid crystal display element with excellent display quality, fast response speed and suppressed flicker. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a diagram schematically showing an example of the structure of the liquid crystal display element of the present invention.

[0051] Figure 2 Yes Figure 1 FIG. 1 is an enlarged plan view of a region surrounded by line II of the electrode layer 3 formed on the substrate 2. FIG.

[0052] Figure 3 is along Figure 2 Cutting along the III-III line Figure 1 A cross-sectional view of a liquid crystal display element is shown.

[0053] Figure 4 It is a diagram schematically showing the alignment direction of liquid crystal induced by the alignment film 4 .

[0054] Figure 5 Yes Figure 1 FIG. 1 is another enlarged plan view of a region surrounded by line II of the electrode layer 3 formed on the substrate 2. FIG.

[0055] Figure 6 is along Figure 2 Cutting along the III-III line Figure 1 A cross-sectional view of another example of a liquid crystal display element shown.

[0056] Figure 7 This is an enlarged plan view of the electrode structure of a liquid crystal display element.

[0057] [Explanation of Symbols]

[0058] 1, 8: Polarizing plate

[0059] 2: First substrate (first transparent insulating substrate)

[0060] 3: Electrode layer

[0061] 4: Oriented film

[0062] 5: Liquid crystal layer

[0063] 6: Color filter

[0064] 7: Second substrate (second transparent insulating substrate)

[0065] 10: Liquid crystal display element (liquid crystal display device)

[0066] 11: Gate electrode

[0067] 12: Gate insulating film (gate insulating layer)

[0068] 13: Semiconductor layer

[0069] 14: Insulation layer

[0070] 15: Ohmic contact layer

[0071] 16: Drain electrode

[0072] 17: Source electrode

[0073] 18: Insulation protection layer

[0074] 21: Pixel electrode

[0075] 22: Shared electrode

[0076] 23: Storage capacitor

[0077] 24: Drain electrode

[0078] 25: Data bus

[0079] 26: Gate bus

[0080] 27: Source bus

[0081] 28: Gate electrode

[0082] 29: Shared line

[0083] 30: Liquid crystal molecules

[0084] 41: Pixel electrode

[0085] 42: Shared electrode

[0086] E: Electric field

[0087] G: Distance between the first substrate and the second substrate (cell gap)

[0088] l: electrode width of the comb-shaped portion of the pixel electrode 21

[0089] m: Width of the gap between the comb-shaped portions of the pixel electrode 21

[0090] n: electrode width of the common electrode 22

[0091] R: Distance between electrodes

[0092] θ: angle DETAILED DESCRIPTION

[0093] 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 that is more negative than that of N-2. In order to achieve both high-speed response and flicker reduction and suppression of the obtained liquid crystal display element, it is important to use only one compound represented by the general formula (N-1-1).

[0094] [Chemistry 8]

[0095]

[0096] (Where R N111 and R N112 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0097] R N111 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably a propyl group or a pentyl group. N112 It 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 more preferably an ethoxy group or a butoxy group.

[0098] Furthermore, the compound represented by the general formula (N-1-1) is preferably a compound selected from the group of compounds represented by formulas (N-1-1.1) to (N-1-1.8), more preferably a compound represented by formulas (N-1-1.1) to (N-1-1.4), further preferably a compound represented by formulas (N-1-1.1) and (N-1-1.3), and further more preferably a compound represented by formula (N-1-1.1).

[0099] [Chemistry 9]

[0100]

[0101] When emphasis is placed on improvement of Δε, it is preferred to set the content high. When emphasis is placed on solubility at low temperatures, a high content leads to a high effect. When emphasis is placed on T NI In the case of, if the content is set to be small, the effect is high. Furthermore, in the case of improving the dripping mark or the burning mark characteristics, it is preferred to set the range of the content to medium. In addition, in order to take into account the high-speed response of the obtained liquid crystal display element and the reduction and suppression of flicker, relative to the total amount of the liquid crystal composition of the present invention, the preferred lower limit of the content of one compound represented by formula (N-1-1), more specifically, one compound selected from the compound group represented by formula (N-1-1.1) to formula (N-1-1.8) is 10 mass%, 11 mass%, 12 mass%, 13 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the content is 35 mass%, 30 mass%, 29 mass%, 28 mass%, 27 mass%, 25 mass%, 24 mass%, 23 mass%, 22 mass%, 21 mass%, 20 mass%, 18 mass%, 17 mass%.

[0102] 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 that is negatively larger than that of N-2. In order to achieve both high-speed response and flicker reduction and suppression of the obtained liquid crystal display element, it is important to use only one compound represented by the general formula (N-1-2).

[0103] [Chemistry 10]

[0104]

[0105] (Where R N121 and R N122 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0106] R N121 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group, a butyl group or a pentyl group. N122 It 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 more preferably a methyl group, a propyl group, a methoxy group, an ethoxy group, or a propoxy group.

[0107] Furthermore, the compound represented by the general formula (N-1-2) is preferably a compound selected from the group of compounds represented by formulas (N-1-2.1) to (N-1-2.11), more preferably a compound represented by formulas (N-1-2.3) to (N-1-2.7), (N-1-2.8), (N-1-2.9) and (N-1-2.11), further preferably a compound represented by formulas (N-1-2.3) to (N-1-2.7), and further more preferably a compound represented by formula (N-1-2.4).

[0108] [Chemistry 11]

[0109]

[0110] In order to achieve both high-speed response and flicker reduction and suppression of the obtained liquid crystal display element, the preferred lower limit of the content of one compound represented by formula (N-1-2), more specifically one compound selected from the group of compounds represented by formula (N-1-2.1) to formula (N-1-2.11), relative to the total amount of the liquid crystal composition of the present invention is 10 mass%, 11 mass%, 12 mass%, 13 mass%, 14 mass%, 15 mass%, 16 mass%, 17 mass%, 18 mass%, 19 mass%. The preferred upper limit of the content relative to the total amount of the liquid crystal composition of the present invention is 35 mass%, 30 mass%, 29 mass%, 28 mass%, 27 mass%, 26 mass%, 25 mass%, 24 mass%, 23 mass%, 21 mass%.

[0111] 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 that is more negative than that of N-2. In order to achieve both high-speed response of the obtained liquid crystal display element and reduction and suppression of flicker, it is important to use only one compound represented by the general formula (N-1-3).

[0112] [Chemistry 12]

[0113]

[0114] (Where R N131 and R N132 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0115] R N131 and R N132 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 more preferably a methyl group, a propyl group, an ethoxy group, or a butoxy group.

[0116] Furthermore, the compound represented by the general formula (N-1-3) is preferably a compound selected from the group of compounds represented by formulas (N-1-3.1) to (N-1-3.8), more preferably a compound represented by formulas (N-1-3.1) to (N-1-3.4), further preferably a compound represented by formulas (N-1-3.1) and (N-1-3.2), and further more preferably a compound represented by formula (N-1-3.2).

[0117] [Chemistry 13]

[0118]

[0119] When emphasis is placed on improvement of Δε, it is preferred to set the content high. When emphasis is placed on solubility at low temperatures, a high content leads to a high effect. When emphasis is placed on T NI In the case of, if the content is set to be small, the effect is high. In addition, in order to take into account the high-speed response of the obtained liquid crystal display element and the reduction and suppression of flicker, relative to the total amount of the liquid crystal composition of the present invention, the preferred lower limit of the content of one compound represented by formula (N-1-3), more specifically selected from the compound group represented by formula (N-1-3.1) to formula (N-1-3.8) is 3 mass%, 5 mass%, 7 mass%, 10 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the content is 30 mass%, 25 mass%, 20 mass%, 18 mass%, 16 mass%.

[0120] It is preferred that one or more compounds selected from the group of compounds represented by general formula (N-1-4-1) and / or general formula (N-1-4-2) be further used in the liquid crystal composition of the present invention as a compound having a dielectric anisotropy that is more negative than N-2.

[0121] [Chemistry 14]

[0122]

[0123] (Where 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 represents a 1,4-cyclohexylene group (one -CH2- or two or more non-adjacent -CH2- in the group may be substituted with -O-) or a 1,4-phenylene group (one -CH= or two or more non-adjacent -CH= in the group may be substituted with -N=), and X 1241 and X 1242 One of them represents a fluorine atom and the other represents a hydrogen atom)

[0124] In the general formula (N-1-4-1), R 1411 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group, a butyl group or a pentyl group. 1412 It 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 more preferably a methyl group, a propyl group, a methoxy group, an ethoxy group, or a propoxy group.

[0125] Furthermore, the compound represented by the general formula (N-1-4-1) is preferably a compound selected from the group of compounds represented by formulas (N-1-4-1.1) to (N-1-4-1.8), more preferably a compound represented by formulas (N-1-4-1.1) to (N-1-4-1.4), and further preferably a compound represented by formulas (N-1-4-1.1) to (N-1-4-1.2).

[0126] [Chemistry 15]

[0127]

[0128] In order to balance the high-speed response of the obtained liquid crystal display element with the reduction and suppression of flicker, the preferred lower limit of the content of one compound represented by formula (N-1-4-1), more specifically one compound selected from the group of compounds represented by formula (N-1-4-1.1) to formula (N-1-4-1.8), relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 2 mass%, 4 mass%, 6 mass%. The preferred upper limit of the content relative to the total amount of the liquid crystal composition of the present invention is 15 mass%, 10 mass%, 8 mass%, 7 mass%.

[0129] In the general formula (N-1-4-2), R 1421 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group, a butyl group or a pentyl group. 1422 It 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 more preferably a methyl group, a propyl group, a methoxy group, an ethoxy group, or a propoxy group.

[0130] Furthermore, the compound represented by the general formula (N-1-4-2) is preferably a compound selected from the group of compounds represented by formulas (N-1-4-2.1) to (N-1-4-2.16), more preferably a compound represented by formulas (N-1-4-2.1) to (N-1-4-2.4), (N-1-4-2.9) to (N-1-4-2.12), further preferably a compound represented by formulas (N-1-4-2.1) to (N-1-4-2.4), and further more preferably a compound represented by formulas (N-1-4-2.2) to (N-1-4-2.3).

[0131] [Chemistry 16]

[0132]

[0133] In order to balance the high-speed response of the obtained liquid crystal display element with the reduction and suppression of flicker, the preferred lower limit of the content of one compound represented by formula (N-1-4-2), more specifically one compound selected from the group of compounds represented by formula (N-1-4-2.1) to formula (N-1-4-2.16), relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 2 mass%, 4 mass%, 6 mass%. The preferred upper limit of the content relative to the total amount of the liquid crystal composition of the present invention is 18 mass%, 15 mass%, 12 mass%, 10 mass%.

[0134] In the liquid crystal composition of the present invention, one or more compounds selected from the group consisting of compounds represented by general formula (N-1-5), compounds represented by general formula (N-1-12), compounds represented by general formula (N-1-13), compounds represented by general formula (N-1-15), and compounds represented by general formula (N-1-17) may be used as compounds having a dielectric anisotropy that is negatively larger than N-2. However, in order to achieve both high-speed response and flicker reduction and suppression of the obtained liquid crystal display element, it is preferred that only one compound represented by general formula (N-1-1), one compound represented by general formula (N-1-2), one compound represented by general formula (N-1-3), and one or more compounds selected from the group consisting of compounds represented by general formula (N-1-4-1) and / or general formula (N-1-4-2) are contained as compounds having a dielectric anisotropy that is negatively larger than N-2.

[0135] The compounds represented by the general formula (N-1-5) are the following compounds.

[0136] [Chemistry 17]

[0137]

[0138] (Where R N151 and R N152 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0139] 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 more preferably an ethyl group, a propyl group, or a butyl group.

[0140] The compound represented by the general formula (N-1-12) is the following compound.

[0141] [Chemistry 18]

[0142]

[0143] (Where R N1121 and R N1122 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0144] R N1121 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group. N1122 It 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 more preferably an ethoxy group, a propoxy group, or a butoxy group.

[0145] The compound represented by the general formula (N-1-13) is the following compound.

[0146] [Chemistry 19]

[0147]

[0148] (Where R N1131 and R N1132 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0149] R N1131 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group. N1132 It 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 more preferably an ethoxy group, a propoxy group, or a butoxy group.

[0150] The compound represented by the general formula (N-1-15) is the following compound.

[0151] [Chemistry 20]

[0152]

[0153] (Where R N1151 and R N1152 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0154] R N1151 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group. N1152 It 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 more preferably an ethoxy group, a propoxy group, or a butoxy group.

[0155] The compound represented by the general formula (N-1-17) is the following compound.

[0156] [Chemistry 21]

[0157]

[0158] (Where R N1171 and R N1172 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0159] R N1171 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group. N1172 It 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 more preferably an ethoxy group, a propoxy group, or a butoxy group.

[0160] In the case where the liquid crystal composition of the present invention further uses one or more compounds selected from the group consisting of compounds represented by general formula (N-1-5), compounds represented by general formula (N-1-12), compounds represented by general formula (N-1-13), compounds represented by general formula (N-1-15), and compounds represented by general formula (N-1-17) as compounds having a dielectric anisotropy that is more negative than N-2, 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. 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.

[0161] The liquid crystal composition of the present invention contains a compound represented by formula (ii-1.22) as an essential component as a substantially dielectrically neutral compound (value of Δε is -2 to 2).

[0162] [Chemistry 22]

[0163]

[0164] In order to balance the high-speed response of the obtained liquid crystal display element with the reduction and suppression of flicker, the lower limit of the preferred content of the compound represented by formula (ii-1.22) is 10 mass%, 15 mass%, 16 mass%, 17 mass%, 18 mass%, 20 mass%, 21 mass%, 22 mass%, 23 mass% relative to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 38 mass%, 35 mass%, 32 mass%, 30 mass%, 29 mass% relative to the total amount of the liquid crystal composition of the present invention.

[0165] The liquid crystal composition of the present invention contains a compound represented by formula (ii-1.13) as an essential component as a dielectrically substantially neutral compound (value of Δε is -2 to 2).

[0166] [Chemistry 23]

[0167]

[0168] In order to balance the high-speed response of the obtained liquid crystal display element with the reduction and suppression of flicker, the lower limit of the preferred content of the compound represented by formula (ii-1.13) is 5 mass%, 8 mass%, 10 mass%, 15 mass%, 17 mass%, 18 mass%, 20 mass% relative to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred content is 40 mass%, 35 mass%, 25 mass%, 22 mass%, 20 mass%, 17 mass%, 15 mass% relative to the total amount of the liquid crystal composition of the present invention.

[0169] The liquid crystal composition of the present invention contains one or more compounds selected from the group of compounds represented by general formula (L-4) and / or general formula (L-5) as essential components as a dielectrically substantially neutral compound (Δε value is -2 to 2).

[0170] In order to balance the high-speed response of the obtained liquid crystal display element with the reduction and suppression of flicker, the lower limit of the preferred total content of the compounds selected from the compound group represented by general formula (L-4) and / or general formula (L-5) relative to the total amount of the liquid crystal composition of the present invention is 3 mass%, 5 mass%, 7 mass%, 9 mass%, 10 mass%. The upper limit of the preferred total content relative to the total amount of the liquid crystal composition of the present invention is 25 mass%, 20 mass%, 18 mass%, 15 mass%, 13 mass%, 11 mass%.

[0171] The compound represented by the general formula (L-4) is the following compound.

[0172] [Chemistry 24]

[0173]

[0174] (Where R L41 and R L42 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0175] R L41 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R L42 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 is preferred.

[0176] The compound represented by the general formula (L-4) can also be used alone, but two or more compounds can also be used in combination. The type of compound that can be combined is not particularly limited, and is used in combination according to the viewpoint of high-speed response of the obtained liquid crystal display element and reduction and suppression of flicker, and according to the solubility at low temperature, transition temperature, electrical reliability, birefringence and other required performances. The type of compound used, for example, as one embodiment of the present invention, is one, two, three, four, five or more.

[0177] In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-4) needs to be appropriately adjusted according to the required performance such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, burn marks, dielectric constant anisotropy, etc.

[0178] In order to balance the high-speed response of the obtained liquid crystal display element with the reduction and suppression of flicker, the lower limit of the preferred total content of the compounds represented by the general formula (L-4) is 3 mass%, 5 mass%, 7 mass%, 9 mass%, and 10 mass% relative to the total amount of the liquid crystal composition of the present invention. The upper limit of the preferred total content is 25 mass%, 20 mass%, 18 mass%, 15 mass%, 13 mass%, and 11 mass% relative to the total amount of the liquid crystal composition of the present invention.

[0179] The compound represented by the general formula (L-4) is preferably, for example, a compound represented by formula (L-4.1) to formula (L-4.3).

[0180] [Chemistry 25]

[0181]

[0182] Depending on the required performance such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc., it may contain the compound represented by formula (L-4.1), it may contain the compound represented by formula (L-4.2), it may contain both the compound represented by formula (L-4.1) and the compound represented by formula (L-4.2), and it may contain all the compounds represented by formulas (L-4.1) to (L-4.3).

[0183] The preferred lower limit of the 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 mass%, 1 mass%, 3 mass%, 5 mass%, 7 mass%, 9 mass%, and the preferred upper limit is 15 mass%, 13 mass%, 10 mass%, 8 mass%, 5 mass%.

[0184] When containing both the compound represented by formula (L-4.1) and the compound represented by formula (L-4.2), the preferred lower limit of the content of the two compounds 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%, 9 mass%, and the preferred upper limit is 15 mass%, 13 mass%, 10 mass%, 8 mass%, 5 mass%.

[0185] The compound represented by the general formula (L-4) is preferably a compound represented by the formula (L-4.4) to the formula (L-4.6), and more preferably a compound represented by the formula (L-4.4).

[0186] [Chemistry 26]

[0187]

[0188] Depending on the required performance such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc., it may contain a compound represented by formula (L-4.4), it may contain a compound represented by formula (L-4.5), or it may contain both a compound represented by formula (L-4.4) and a compound represented by formula (L-4.5).

[0189] Relative to the total amount of the liquid crystal composition of the present invention, 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%, 10 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the total content is 25 mass%, 20 mass%, 18 mass%, 15 mass%, 13 mass%, 11 mass%.

[0190] The compound represented by general formula (L-4) is preferably a compound represented by formula (L-4.7) to formula (L-4.10), and is particularly preferably a compound represented by formula (L-4.9).

[0191] [Chemistry 27]

[0192]

[0193] The preferred lower limit of the content of the compounds 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%, 9 mass%, and the preferred upper limit is 15 mass%, 13 mass%, 10 mass%, 8 mass%, 5 mass%.

[0194] The compound represented by the general formula (L-5) is the following compound.

[0195] [Chemistry 28]

[0196]

[0197] (Where R L51 and R L52 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0198] R L51 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R L52 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 is preferred.

[0199] The compound represented by the general formula (L-5) can also be used alone, but two or more compounds can also be used in combination. The type of compound that can be combined is not particularly limited, and is used in combination according to the viewpoint of high-speed response of the obtained liquid crystal display element and reduction and suppression of flicker, and according to the solubility at low temperature, transition temperature, electrical reliability, birefringence and other required performances. The type of compound used, for example, as one embodiment of the present invention, is one, two, three, four, five or more.

[0200] 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 temperatures, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, burn marks, dielectric constant anisotropy, etc.

[0201] In order to balance the high-speed response of the obtained liquid crystal display element with the reduction and suppression of flicker, the lower limit of the preferred total content of the compounds represented by the general formula (L-5) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 3 mass%, 5 mass%, 7 mass%, 9 mass%, 10 mass%. The upper limit of the preferred total content relative to the total amount of the liquid crystal composition of the present invention is 25 mass%, 20 mass%, 18 mass%, 15 mass%, 13 mass%, 11 mass%.

[0202] The compound represented by general formula (L-5) is preferably a compound represented by formula (L-5.1), formula (L-5.2) or formula (L-5.3), and is particularly preferably a compound represented by formula (L-5.1).

[0203] The preferred lower limits of the content when these compounds are used alone or in plurality relative to the total amount of the liquid crystal composition of the present invention are 0 mass%, 1 mass%, 3 mass%, 5 mass%, 7 mass%, and 9 mass%, and the preferred upper limits are 15 mass%, 13 mass%, 10 mass%, 8 mass%, and 5 mass%.

[0204] [Chemistry 29]

[0205]

[0206] The compound represented by general formula (L-5) is preferably a compound represented by formula (L-5.3) or formula (L-5.4).

[0207] The preferred lower limits of the contents of these compounds relative to the total amount of the liquid crystal composition of the present invention are 0 mass%, 1 mass%, 3 mass%, 5 mass%, 7 mass%, and 9 mass%, and the preferred upper limits are 15 mass%, 13 mass%, 10 mass%, 8 mass%, and 5 mass%.

[0208] [Chemistry 30]

[0209]

[0210] The compound represented by general formula (L-5) is preferably a compound selected from the group consisting of compounds represented by formulae (L-5.5) to (L-5.7), and is particularly preferably a compound represented by formula (L-5.7).

[0211] The preferred lower limits of the contents of these compounds relative to the total amount of the liquid crystal composition of the present invention are 0 mass%, 1 mass%, 3 mass%, 5 mass%, 7 mass%, and 9 mass%, and the preferred upper limits are 15 mass%, 13 mass%, 10 mass%, 8 mass%, and 5 mass%.

[0212] [Chemistry 31]

[0213]

[0214] In the liquid crystal composition of the present invention, as a dielectrically roughly neutral compound (the value of Δε is -2 to 2), one or more compounds selected from the compounds represented by the following general formula (L) can be further used. However, in order to take into account both the high-speed response of the obtained liquid crystal display element and the reduction and suppression of flicker, it is preferred to only contain 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 the compound represented by the general formula (ii-1.13) as the dielectrically roughly neutral compound.

[0215] In addition, when one or more compounds selected from the group of compounds represented by general formula (L) are used, the lower limit of the content is preferably 0 mass %, 1 mass %, or 2 mass % relative to the total amount of the liquid crystal composition of the present invention. The upper limit of the content is preferably 7 mass %, 5 mass %, or 3 mass % relative to the total amount of the liquid crystal composition of the present invention.

[0216] The compounds represented by the general formula (L) are the following compounds.

[0217] [Chemistry 32]

[0218]

[0219] (Where R L1 and R L2 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- groups in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-,

[0220] n L1 Indicates 1, 2, or 3,

[0221] A L1 , A L2 and A L3 Independently represent the choice

[0222] (a) 1,4-cyclohexylene (one -CH2- or two or more non-adjacent -CH2- in the group may be substituted with -O-)

[0223] (b) 1,4-phenylene (one -CH= or two or more non-adjacent -CH= in the group may be substituted with -N=) and

[0224] (c) naphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl or decahydronaphthalene-2,6-diyl (one -CH= or two or more non-adjacent -CH= in naphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl may be substituted with -N=)

[0225] In the group consisting of, the group (a), the group (b) and the group (c) are independently substituted by a cyano group, a fluorine atom or a chlorine atom,

[0226] Z L1 and Z L2 Each independently represents a single bond, -CH2CH2-, -(CH2)4-, -OCH2-, -CH2O-, -COO-, -OCO-, -OCF2-, -CF2O-, -CH=NN=CH-, -CH=CH-, -CF=CF- or -C≡C-,

[0227] In the presence of multiple A L2 and Z L2 In the case of the above, these may be the same or different. Among them, in the general formula (L), the compounds represented by the formula (ii-1.22) and the general formula (L-4), the compounds represented by the general formula (L-5) and the formula (ii-1.13) are excluded)

[0228] The compound represented by the general formula (L) can be used alone, but can also be used in combination. The types of the compounds that can be combined are not particularly limited, and are used in combination according to the desired performance such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. The type of compound used is, for example, one as one embodiment of the present invention. Or in another embodiment of the present invention, it is two, three, four, five, six, seven, eight, nine, ten or more.

[0229] In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L) needs to be appropriately adjusted according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, burn marks, dielectric anisotropy, etc.

[0230] When reliability is important, R L1 and R L2 All of them are preferably alkyl groups. When emphasis is placed on reducing the volatility of the compound, alkoxy groups are preferred. When emphasis is placed on reducing the viscosity, at least one of them is preferably an alkenyl group.

[0231] About R L1 and R L2In the case where the ring structure to which it is bonded is a phenyl (aromatic), it is preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and an alkenyl group having 4 to 5 carbon atoms. In the case where the ring structure to which it is bonded is a saturated ring structure such as cyclohexane, pyran, and dioxane, it is preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and an alkenyl group having 2 to 5 carbon atoms. In order to stabilize the nematic phase, the total number of carbon atoms and oxygen atoms when present is preferably 5 or less, and is preferably linear.

[0232] The alkenyl group is preferably a group selected from any one of formula (R1) to formula (R9). (The black dots in each formula represent carbon atoms in the ring structure)

[0233] [Chemistry 33]

[0234]

[0235] About n L1 , preferably 0 when the response speed is important, preferably 2 or 3 to improve the upper limit temperature of the nematic phase, and preferably 1 to achieve a balance between them. In addition, in order to satisfy the characteristics required as a composition, it is preferred to combine compounds with different values.

[0236] About A L1 , A L2 and A L3 , when it is required to increase Δn, it is preferably aromatic, and in order to improve the response speed, it is preferably aliphatic, and preferably independently represents trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, 1,4-cyclohexenylene, 1,4-bicyclo[2.2.2]octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, and more preferably represents the following structure.

[0237] [Chemistry 34]

[0238]

[0239] More preferably, it represents trans-1,4-cyclohexylene or 1,4-phenylene.

[0240] When response speed is important, Z L1 and Z L2 Preferred is a single bond.

[0241] The number of halogen atoms in the molecule is preferably zero or one.

[0242] 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).

[0243] The compound represented by the general formula (L) is preferably a compound represented by the general formula (ii-1) (except for compounds represented by the formula (ii-1.13) and the formula (ii-1.22)).

[0244] [Chemistry 35]

[0245]

[0246] (Where R ii11 represents a hydrogen atom or a methyl group, R ii2 represents an alkyl group having 1 to 10 carbon atoms, wherein one or two or more non-adjacent -CH2- groups in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0247] 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.

[0248] The compound represented by general formula (ii-1) is preferably a compound selected from the group consisting of compounds represented by formulae (ii-1.11) to (ii-1.12).

[0249] [Chemistry 36]

[0250]

[0251] Relative to the total amount of the liquid crystal composition of the present invention, the preferred lower limit of the content of each compound or the total amount of the compounds represented by formula (ii-1.11) to formula (ii-1.12) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, 2 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the content is 7 mass%, 5 mass%, 3 mass%.

[0252] In addition, 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 is more preferably a compound represented by formula (ii-1.23) to formula (ii-1.24).

[0253] [Chemistry 37]

[0254]

[0255] Relative to the total amount of the liquid crystal composition of the present invention, the preferred lower limit of the content of each compound or the total of the compounds represented by formula (ii-1.21) to formula (ii-1.24) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, 2 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the content is 7 mass%, 5 mass%, 3 mass%.

[0256] In addition, the compound represented by general formula (ii-1) is preferably a compound selected from the group consisting of compounds represented by formula (ii-1.31) and formula (ii-1.41).

[0257] [Chemistry 38]

[0258]

[0259] Relative to the total amount of the liquid crystal composition of the present invention, the preferred lower limit of the content of each compound or the total of the compounds represented by formula (ii-1.31) to formula (ii-1.41) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, 2 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the content is 7 mass%, 5 mass%, 3 mass%.

[0260] 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 the general formula (ii-4).

[0261] [Chemistry 39]

[0262]

[0263] (R ii31 and R ii41 Each independently represents an alkyl group having 1 to 10 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0264] R ii31 and R ii41 Preferred are linear alkyl groups having 1 to 5 carbon atoms, linear alkoxy groups having 1 to 4 carbon atoms, and linear alkenyl groups having 2 to 5 carbon atoms.

[0265] The preferred lower limit of the content of the compound represented by formula (ii-3) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, or 2 mass%. The preferred upper limit of the content relative to the total amount of the liquid crystal composition of the present invention is 7 mass%, 5 mass%, or 3 mass%.

[0266] The preferred lower limit of the content of the compound represented by formula (ii-4) relative to the total amount of the liquid crystal composition of the present invention is 0 mass %, 1 mass %, or 2 mass %. The preferred upper limit of the content relative to the total amount of the liquid crystal composition of the present invention is 7 mass %, 5 mass %, or 3 mass %.

[0267] Furthermore, the compounds represented by general formula (ii-3) and general formula (ii-4) are preferably compounds selected from the group of compounds represented by formula (ii-3.1) to formula (ii-4.3), and more preferably compounds represented by formula (ii-3.2) or formula (ii-4.2).

[0268] [Chemistry 40]

[0269]

[0270] The preferred lower limit of the content of each compound or the total of the compounds represented by formula (ii-3.1) to formula (ii-4.3) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, or 2 mass%. The preferred upper limit of the content relative to the total amount of the liquid crystal composition of the present invention is 7 mass%, 5 mass%, or 3 mass%.

[0271] 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).

[0272] The compound represented by the general formula (L-2) is the following compound.

[0273] [Chemistry 41]

[0274]

[0275] (Where R L21 and R L22 Each independently represents an alkyl group having 1 to 10 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-)

[0276] R L21 It is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and RL22 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 is preferred.

[0277] The compound represented by the general formula (L-2) can also be used alone, but two or more compounds can also be used in combination. The types of the compounds that can be combined are not particularly limited, and they are used in combination according to the required performance such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. The types of compounds used, for example, as one embodiment of the present invention, are one, two, three, four, five or more.

[0278] Relative to the total amount of the liquid crystal composition of the present invention, the preferred lower limit of the total amount of the compound represented by formula (L-2) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, 2 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the content is 7 mass%, 5 mass%, 3 mass%.

[0279] Furthermore, the compound represented by the general formula (L-2) is preferably a compound selected from the group of compounds represented by formula (L-2.1) to formula (L-2.6), and more preferably a compound represented by formula (L-2.1), formula (L-2.3), formula (L-2.4) and formula (L-2.6).

[0280] [Chemistry 42]

[0281]

[0282] The preferred lower limit of the content of each compound or the total of the compounds represented by formula (L-2.1) to formula (L-2.6) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, or 2 mass%. The preferred upper limit of the content relative to the total amount of the liquid crystal composition of the present invention is 7 mass%, 5 mass%, or 3 mass%.

[0283] 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).

[0284] The compound represented by the general formula (L-6) is the following compound.

[0285] [Chemistry 43]

[0286]

[0287] (Where R L61 and R L62Each independently represents an alkyl group having 1 to 10 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-, and X L61 and X L62 each independently represents a hydrogen atom or a fluorine atom)

[0288] R L61 and R L62 Preferably, each of them is independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably X L61 and X L62 One of them is a fluorine atom and the other is a hydrogen atom.

[0289] The compound represented by the general formula (L-6) can also be used alone, but two or more compounds can also be used in combination. The types of the compounds that can be combined are not particularly limited, and are used in combination according to the required performance such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. The types of compounds used, for example, as one embodiment of the present invention, are one, two, three, four, five or more.

[0290] Relative to the total amount of the liquid crystal composition of the present invention, the preferred lower limit of the total amount of the compound represented by formula (L-6) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, 2 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the content is 7 mass%, 5 mass%, 3 mass%.

[0291] The compound represented by general formula (L-6) is preferably a compound represented by formula (L-6.1) to formula (L-6.9).

[0292] [Chemistry 44]

[0293]

[0294] The types of compounds that can be combined are not particularly limited, but it is preferred to contain one to three of these compounds, and more preferably one to four. In addition, since the wide molecular weight distribution of the selected compound is also effective for solubility, it is preferred to select a compound from the compounds represented by formula (L-6.1) or formula (L-6.2), a compound from the compounds represented by formula (L-6.4) or formula (L-6.5), a compound from the compounds represented by formula (L-6.6) or formula (L-6.7), and a compound from the compounds represented by formula (L-6.8) or formula (L-6.9), and combine these appropriately. Among them, it is preferred to include compounds represented by formula (L-6.1), formula (L-6.3), formula (L-6.4), formula (L-6.6) and formula (L-6.9).

[0295] The preferred lower limit of the content of each compound or the total of the compounds represented by formula (L-6.1) to formula (L-6.9) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, or 2 mass%. The preferred upper limit of the content relative to the total amount of the liquid crystal composition of the present invention is 7 mass%, 5 mass%, or 3 mass%.

[0296] Furthermore, the compound represented by the general formula (L-6) is preferably a compound represented by, for example, formula (L-6.10) to formula (L-6.17), and among them, a compound represented by formula (L-6.11) is preferred.

[0297] [Chemistry 45]

[0298]

[0299] Relative to the total amount of the liquid crystal composition of the present invention, the preferred lower limit of the content of each compound or the total of the compounds represented by formula (L-6.10) to formula (L-6.17) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, 2 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the content is 7 mass%, 5 mass%, 3 mass%.

[0300] 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).

[0301] The compound represented by the general formula (L-7) is the following compound.

[0302] [Chemistry 46]

[0303]

[0304] (Where R L71 and RL72 Each independently represents an alkyl group having 1 to 10 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted 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) 1,4-cyclohexylene (one -CH2- or two or more non-adjacent -CH2- in the group may be substituted with -O-), (b) 1,4-phenylene (one -CH= or two or more non-adjacent -CH= in the group may be substituted with -N=), and (c) naphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl or decahydronaphthalene-2,6-diyl (one -CH= or two or more non-adjacent -CH= in naphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl may be substituted with -N=), and Z L71 represents a single bond, -CH2CH2-, -(CH2)4-, -OCH2-, -CH2O-, -COO-, -OCO-, -OCF2-, -CF2O-, -CH=NN=CH-, -CH=CH-, -CF=CF- or -C≡C-, X L71 and X L72 represents hydrogen atom)

[0305] In the formula, R L71 and R L72 Preferably, each of A and A is independently 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 Preferably, each independently is 1,4-cyclohexylene or 1,4-phenylene, A L71 and A L72 The hydrogen atoms on Z can be replaced by fluorine atoms independently. L71 It is preferably a single bond or COO-, and more preferably a single bond.

[0306] The types of compounds that can be combined are not particularly limited, and are combined according to required performance such as solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. The types of compounds used are, for example, one, two, three, or four as one embodiment of the present invention.

[0307] In the composition of the present invention, the content of the compound represented by the general formula (L-7) needs to be appropriately adjusted according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, burn marks, dielectric constant anisotropy, etc.

[0308] Relative to the total amount of the liquid crystal composition of the present invention, the preferred lower limit of the content of the compound represented by the general formula (L-7) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, 2 mass%. Relative to the total amount of the liquid crystal composition of the present invention, the preferred upper limit of the content is 7 mass%, 5 mass%, 3 mass%.

[0309] In the case of an embodiment in which a high Tni is desired, the liquid crystal composition of the present invention preferably contains a large amount of the compound represented by formula (L-7), whereas in an embodiment in which a low viscosity is desired, the content is preferably reduced.

[0310] 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).

[0311] [Chemistry 47]

[0312]

[0313] The preferred lower limit of the content of each compound or the total of the compounds represented by formula (L-7.1) to formula (L-7.4) relative to the total amount of the liquid crystal composition of the present invention is 0 mass%, 1 mass%, or 2 mass%. The preferred upper limit of the content relative to the total amount of the liquid crystal composition of the present invention is 7 mass%, 5 mass%, or 3 mass%.

[0314] In the liquid crystal composition of the present invention, relative to the total amount of the liquid crystal composition of the present invention, the content of the compound represented by the general formula (N-1-1), the general formula (N-1-2), and the general formula (N-1-3) is as a lower limit, and with respect to the lower limit in the composition, it is preferably 25% by mass or more, more preferably 28% by mass or more, further preferably 30% by mass or more, further more preferably 33% by mass or more, particularly preferably 35% by mass or more, and most preferably 38% by mass or more. In addition, as an upper limit, it is preferably 70% by mass or less, more preferably 68% by mass or less, further preferably 65% ​​by mass or less, further more preferably 63% by mass or less, further preferably 60% by mass or less, particularly preferably 55% by mass or less, and most preferably 50% by mass or less.

[0315] In the liquid crystal composition of the present invention, relative to the total amount of the liquid crystal composition of the present invention, the content of the compound represented by the general formula (N-1-1), the general formula (N-1-2), the general formula (N-1-3), the general formula (N-1-4-1) and the general formula (N-1-4-2) is as a lower limit, and with respect to the lower limit in the composition, it is preferably 25% by mass or more, more preferably 28% by mass or more, further preferably 30% by mass or more, further preferably 33% by mass or more, particularly preferably 35% by mass or more, and most preferably 38% by mass or more. In addition, as an upper limit, it is preferably 70% by mass or less, more preferably 68% by mass or less, further preferably 65% ​​by mass or less, further more preferably 63% by mass or less, further preferably 60% by mass or less, particularly preferably 55% by mass or less, and most preferably 50% by mass or less.

[0316] In the liquid crystal composition of the present invention, relative to the total amount of the liquid crystal composition of the present invention, the content of the compound represented by formula (ii-1.22), formula (ii-1.13), general formula (L-4) and general formula (L-5) is as a lower limit, and with respect to the lower limit in the composition, it is preferably 20% by mass or more, more preferably 25% by mass or more, and further preferably 28% by mass or more, and further preferably 30% by mass or more, particularly preferably 33% by mass or more, and most preferably 34% by mass or more. In addition, as an upper limit, it is preferably 50% by mass or less, more preferably 45% by mass or less, and further preferably 42% by mass or less, and further more preferably 40% by mass or less, particularly preferably 38% by mass or less, and most preferably 36% by mass or less.

[0317] In the liquid crystal composition of the present invention, from the viewpoint of reducing flicker, it is preferred to use a compound represented by formula (N-1-1.1) as an essential compound in combination with 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), respectively, and compounds represented by general formula (L-4) and / or general formula (L-5).

[0318] In the liquid crystal composition of the present invention, from the viewpoint of reducing flicker, it is preferred to use a compound represented by formula (N-1-2.4) as a compound represented by formula (N-1-2) in combination with compounds represented by formula (N-1-1), (N-1-3), (N-1-4-1), (N-1-4-2), (ii-1.22), (ii-1.13), and compounds represented by formula (L-4) and / or (L-5) as an essential compound. Here, as compounds represented by formula (L-4) and / or (L-5), it is preferred to use one, two, or three of the compounds represented by formula (L-4.4), (L-5.1), and (L-5.2).

[0319] In the liquid crystal composition of the present invention, from the viewpoint of reducing flicker, it is preferred to use a compound represented by formula (N-1-3.2) as a compound represented by formula (N-1-3) in combination with compounds represented by formula (N-1-1), (N-1-2), (N-1-3), (N-1-4-1), (N-1-4-2), (ii-1.22), (ii-1.13), and compounds represented by formula (L-4) and / or (L-5) as an essential compound. Here, as compounds represented by formula (L-4) and / or (L-5), it is preferred to use one, two, or three of the compounds represented by formula (L-4.4), (L-5.1), and (L-5.2).

[0320] In the liquid crystal composition of the present invention, from the viewpoint of reducing flicker, it is preferred to use a compound represented by formula (N-1-1.1) as a compound represented by general formula (N-1-1) as an essential compound together with compounds represented by 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 compounds represented by general formula (L-4) and / or general formula (L-5), and use a compound represented by formula (N-1-2.4) as a compound represented by general formula (N-1-2) as an essential compound, and use these in combination. Here, as compounds represented by general formula (L-4) and / or general formula (L-5), it is preferred to use one, two, or three of the compounds represented by formula (L-4.4), formula (L-5.1), and formula (L-5.2).

[0321] In the liquid crystal composition of the present invention, from the viewpoint of reducing flicker, it is preferred to use a compound represented by formula (N-1-1.1) as a compound represented by general formula (N-1-1) as an essential compound together with compounds represented by 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 compounds represented by general formula (L-4) and / or general formula (L-5), and to use a compound represented by formula (N-1-3.2) as a compound represented by general formula (N-1-3) as an essential compound, and use these in combination. Here, as compounds represented by general formula (L-4) and / or general formula (L-5), it is preferred to use one, two, or three of the compounds represented by formula (L-4.4), formula (L-5.1), and formula (L-5.2).

[0322] In the liquid crystal composition of the present invention, relative to the total amount of the liquid crystal composition of the present invention, the total content of the compounds represented by the general formula (N-1-1), the general formula (N-1-2), the general formula (N-1-3), the general formula (N-1-4-1), the general formula (N-1-4-2), the formula (ii-1.22), the formula (ii-1.13), the general formula (L-4) and the general formula (L-5) is as a lower limit, and with respect to the lower limit in the composition, it is preferably 60% by mass or more, more preferably 63% by mass or more, further preferably 65% ​​by mass or more, further preferably 68% by mass or more, particularly preferably 70% by mass or more, and most preferably 72% by mass or more. In addition, as an upper limit, it is preferably 100% by mass or less, more preferably 98% by mass or less, further preferably 95% by mass or less, further more preferably 90% by mass or less, particularly preferably 85% by mass or less, and most preferably 82% by mass or less.

[0323] The liquid crystal composition of the present invention has a refractive index anisotropy (Δn) of 0.08 to 0.14 at 20°C, more preferably 0.09 to 0.13, and particularly preferably 0.09 to 0.12. In more detail, in the case of a thin cell gap, it is preferably 0.10 to 0.13, and in the case of a thick cell gap, it is preferably 0.08 to 0.10.

[0324] The viscosity (η) of the liquid crystal composition of the present invention at 20° C. is 10 to 30 mPa·s, more preferably 10 to 25 mPa·s, particularly preferably 10 to 22 mPa·s.

[0325] The rotational viscosity (γ1) of the liquid crystal composition of the present invention at 20° C. is 60 to 200 mPa·s, more preferably 60 to 120 mPa·s, particularly preferably 60 to 100 mPa·s.

[0326] The nematic phase-isotropic liquid phase transition temperature (T ni ) is 60°C to 120°C, but is more preferably 70°C to 100°C, and particularly preferably 70°C to 85°C.

[0327] The liquid crystal composition of the present invention may contain, in addition to the above-mentioned compounds, common nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers, light stabilizers, and the like.

[0328] The liquid crystal display element using the liquid crystal composition of the present invention is a display element of a lateral electric field mode such as an FFS mode or an IPS mode that utilizes an electric field generated in a horizontal direction relative to a substrate. Figure 1 to Figure 7 Examples of FFS mode and IPS mode liquid crystal display elements will be described.

[0329] Figure 1 is a diagram schematically showing the structure of a liquid crystal display element. Figure 1 In the present invention, for the sake of convenience, each structural element is described separately. The structure of the liquid crystal display element 10 of the present invention is as follows: Figure 1 As described above, it is a liquid crystal display element of FFS mode 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, and is characterized by using the liquid crystal composition of the present invention as the liquid crystal composition. The first transparent insulating substrate 2 has an electrode layer 3 formed on the surface on the liquid crystal layer 5 side. In addition, between the liquid crystal layer 5 and the first transparent insulating substrate 2 and the second transparent insulating substrate 7, there is a pair of orientation films 4 that directly contact the liquid crystal composition constituting the liquid crystal layer 5 to induce homogeneous orientation, and the liquid crystal molecules in the liquid crystal composition are oriented in a manner substantially parallel to the substrates 2 and 7 when no voltage is applied. As Figure 1 and Figure 3 As shown, the first substrate 2 and the second substrate 7 may also be sandwiched by a pair of polarizing plates 1 and 8. Figure 1 A color filter 6 is disposed between the second substrate 7 and the alignment film 4 .

[0330] That is, the liquid crystal display element 10 of the present invention is a structure 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 stacked. 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 can be an opaque material such as silicon. The two substrates 2 and 7 are bonded together by a sealing material and a packaging material such as an epoxy-based thermosetting composition arranged in the peripheral area, and in order to maintain the distance between the substrates, granular spacers such as glass particles, plastic particles, and aluminum oxide particles or isolation columns containing resin formed by photolithography can be arranged.

[0331] Figure 2 Yes Figure 1 FIG. 1 is an enlarged plan view of a region surrounded by line II of the electrode layer 3 formed on the substrate 2. FIG. Figure 3 is along Figure 2 Cutting along the III-III line Figure 1 The cross-sectional view of the liquid crystal display element shown in FIG. Figure 2 As shown, in the electrode layer 3 including thin film transistors formed on the surface of the first substrate 2, a plurality of gate bus lines 26 for supplying scanning signals and a plurality of data bus lines 25 for supplying display signals are arranged in a matrix shape in a cross-connected manner. Figure 2 Only a pair of gate bus lines 26 and a pair of data bus lines 25 are shown.

[0332] The unit pixel of the liquid crystal display device is formed by the 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 in 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 each other. The 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 with the gate bus lines 26. The common line 29 is connected to the common electrode 22 so as to supply a common signal to the common electrode 22.

[0333] A preferred embodiment of the structure of the thin film transistor is as follows Figure 3As shown, the present invention comprises: a gate electrode 11 formed on the surface of a substrate 2, a gate insulating layer 12 provided so as to cover the gate electrode 11 and substantially 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 provided so as to cover a portion of the surface of the semiconductor layer 13, a drain electrode 16 provided so as to cover the protective layer 14 and one side end of the semiconductor layer 13 and to be in contact with the gate insulating layer 12 formed on the surface of the substrate 2, a source electrode 17 provided so as to cover the protective film 14 and the other side end of the semiconductor layer 13 and to be in contact with the gate insulating layer 12 formed on the surface of the substrate 2, and an insulating protective layer 18 provided so as to cover 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 for the purpose of eliminating the step difference with the gate electrode, etc.

[0334] The semiconductor layer 13 may be made of amorphous silicon, polycrystalline silicon, etc., but if a transparent semiconductor film such as ZnO, IGZO (In-Ga-Zn-O), indium tin oxide (ITO) or the like is used, the disadvantages of photocarriers caused by light absorption can be suppressed and the aperture ratio of the element can be increased, which is also preferred from the above point of view.

[0335] 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. The ohmic contact layer may use a material containing high concentrations of impurities such as phosphorus, such as n-type amorphous silicon or n-type polycrystalline silicon.

[0336] The gate bus 26, data bus 25, and common line 29 are preferably metal films, more preferably Al, Cu, Au, Ag, Cr, Ta, Ti, Mo, W, Ni, or alloys thereof, and particularly preferably wiring using Al or its alloys. In addition, the insulating protective layer 18 is a layer having an insulating function, and is formed of silicon nitride, silicon dioxide, silicon oxynitride film, or the like.

[0337] exist Figure 2 and Figure 3In the embodiment shown, the common electrode 22 is a flat electrode formed on substantially the entire surface of the gate insulating layer 12, and 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 arranged at a position closer to the first substrate 2 than the pixel electrode 21, and these electrodes are arranged overlapping each other via the insulating protective layer 18. The pixel electrode 21 and the common electrode 22 are formed of transparent conductive materials such as indium tin oxide (Indium Tin Oxide, ITO), indium zinc oxide (Indium Zinc Oxide, IZO), and indium zinc tin oxide (Indium Zinc Tin Oxide, IZTO). Since the pixel electrode 21 and the common electrode 22 are formed of transparent conductive materials, the area of ​​the opening in the unit pixel area becomes larger, and the aperture ratio and transmittance are increased.

[0338] In order to form a fringe electric field between the pixel electrode 21 and the common electrode 22, the inter-electrode distance R between the pixel electrode 21 and the common electrode 22 in the direction horizontal to the substrate is smaller than the distance G between the first substrate 2 and the second substrate 7. Here, the inter-electrode distance R represents the distance in the direction horizontal to the substrate between the electrodes. Figure 3 2 shows an example in which the inter-electrode distance: R=0 due to the overlap of the flat common electrode 22 and the comb-shaped pixel electrode 21. Since the inter-electrode distance: R is smaller than the distance between the first substrate 2 and the second substrate 7 (i.e., the cell gap): G, an electric field E at the edge is formed. Therefore, the FFS type liquid crystal display element can utilize the horizontal electric field (lateral electric field) formed in the direction perpendicular to the line forming the comb shape of the pixel electrode 21 and the parabolic electric field. The electrode width: l of the comb-shaped part of the pixel electrode 21 and the width: m of the gap of the comb-shaped part of the pixel electrode 21 are preferably formed to a width to the extent that the liquid crystal molecules in the liquid crystal layer 5 can be fully driven by the generated electric field.

[0339] From the viewpoint of preventing light leakage, the color filter 6 preferably has a black matrix (not shown) formed in the portion corresponding to the thin film transistor and the storage capacitor 23 .

[0340] A pair of alignment films 4 are provided on the electrode layer 3 and the color filter 6 to directly contact the liquid crystal composition constituting the liquid crystal layer 5 and induce homogeneous alignment. The alignment films 4 are, for example, rubbed polyimide films, and the alignment directions of the alignment films are parallel. Figure 4 The rubbing direction of the alignment film 4 (alignment direction of the liquid crystal composition) of the present embodiment will be described. Figure 4Schematically showing the orientation direction of the liquid crystal induced by the orientation film 4. In the present invention, a liquid crystal composition having a negative dielectric constant anisotropy is used. Therefore, it is preferred that when the direction perpendicular to the comb-shaped line forming the pixel electrode 21 (the direction forming the horizontal electric field) is set as the x-axis, the liquid crystal molecule 30 is oriented in such a way that the angle θ between the x-axis and the long axis direction is approximately 0° to 45°. Figure 3 In the example shown, the angle θ between the x-axis and the long axis direction of the liquid crystal molecule 30 is approximately 0°. The purpose of inducing the alignment direction of the liquid crystal is to increase the maximum transmittance of the liquid crystal display device.

[0341] In addition, the polarizing plate 1 and the polarizing plate 8 can adjust the polarization axis of each polarizing plate so as to adjust the viewing angle or contrast in a good manner, and preferably have mutually orthogonal transmission axes so that these transmission axes work in a normally black mode. In particular, either the polarizing plate 1 or the polarizing plate 8 is preferably configured to have a transmission axis parallel to the orientation direction of the liquid crystal molecules 30. In addition, it is preferred to adjust the product of the refractive index anisotropy Δn of the liquid crystal and the unit thickness d so as to maximize the contrast. Furthermore, a phase difference film for expanding the viewing angle can also be used.

[0342] The FFS mode liquid crystal display device 10 of the above-mentioned structure generates a fringe electric field between the pixel electrode 21 and the common electrode 22 by supplying an image signal (voltage) to the pixel electrode 21 via a thin film transistor (TFT), and drives the liquid crystal using the electric field. That is, in a state where no voltage is applied, the liquid crystal molecules 30 are arranged so that their long axis direction is parallel to the orientation direction of the orientation film 4. If 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 upper part of the pixel electrode 21 and the common electrode 22, and the liquid crystal molecules 30 in the liquid crystal layer 5 rotate in the liquid crystal layer 5 along the formed electric field. In the present invention, since liquid crystal molecules 30 having negative dielectric constant anisotropy are used, the long axis direction of the liquid crystal molecules 30 rotates to be orthogonal to the direction of the generated electric field. Although the liquid crystal molecules 30 located near the pixel electrode 21 are easily affected by the fringe electric field, the polarization direction of the liquid crystal molecules 30 having negative dielectric anisotropy is located at the short axis of the molecule, so the long axis direction thereof will not rotate in a direction orthogonal to the alignment film 4, and the long axis directions of all liquid crystal molecules 30 in the liquid crystal layer 5 can maintain a direction parallel to the alignment film 4. Therefore, compared with the FFS type liquid crystal display element using the liquid crystal molecules 30 having positive dielectric anisotropy, excellent transmittance characteristics can be obtained.

[0343] use Figure 1 to Figure 4 The FFS mode liquid crystal display element described above is an example, and can be implemented in various other forms without departing from the technical concept of the present invention. Figure 5Yes Figure 1 Another example of an enlarged plan view of the region surrounded by line II of the electrode layer 3 formed on the substrate 2 in FIG. Figure 5 As shown, the pixel electrode 21 may have a slit structure. In addition, the slit pattern may be formed to have an inclined angle with respect to the gate bus line 26 or the data bus line 25.

[0344] in addition, Figure 6 is along Figure 2 Cutting along the III-III line Figure 1 Another example of a cross-sectional view of a liquid crystal display element shown in FIG. Figure 6 In the example shown, a comb-shaped or slit-shaped common electrode 22 is used, and the inter-electrode distance between the pixel electrode 21 and the common electrode 22 is R=α. Figure 3 FIG. 4 shows an example in which the common electrode 22 is formed on the gate insulating film 12. Figure 6 As shown, a common electrode 22 may be formed on the first substrate 2, and a pixel electrode 21 may be provided via a gate insulating film 12. The electrode width l of the pixel electrode 21, the electrode width n of the common electrode 22, and the distance R between electrodes are preferably adjusted to a width that allows all liquid crystal molecules in the liquid crystal layer 5 to be driven by the generated electric field.

[0345] The IPS mode liquid crystal display element is formed such that the distance between the pixel electrode and the common electrode in the direction horizontal to the substrate: R is smaller than the distance between the first substrate and the second substrate facing each other: G. Therefore, the IPS mode liquid crystal display element can be as follows Figure 6 Generally, the pixel electrode is arranged closer to the liquid crystal layer than the common electrode. Figure 7 Generally, the pixel electrode 41 and the common electrode 42 are provided on the same surface in a state of being separated and engaged.

[0346] If the liquid crystal composition of the present invention is applied to a display element of a lateral electric field type such as an FFS mode or an IPS mode, the contrast ratio is improved. It is believed that the reason is that when a liquid crystal composition having a negative Δε is applied to a liquid crystal display element of a lateral electric field type, an alignment film or the like that induces a homogeneous orientation is used to orient the liquid crystal molecules in a manner parallel to the substrate surface, but if the liquid crystal composition is used, the fluctuation of the orientation of the liquid crystal molecules decreases. That is, if the liquid crystal composition of the present invention is used, the orientation order of the liquid crystal molecules can be maintained, and the purity of the black of the display element is excellent, and the contrast ratio is improved. It is inferred that the effect contributes to the inherent high elastic constant of the liquid crystal composition.

[0347] [Example]

[0348] The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these Examples. In addition, "%" in the compositions of the following Examples and Comparative Examples means "mass %".

[0349] The following abbreviations are used in describing compounds in Examples: In addition, n represents a natural number.

[0350] (Sidechain)

[0351] -n -C n H 2n+1 A linear alkyl group with n carbon atoms

[0352] n-C n H 2n+1 - a linear alkyl group having n carbon atoms

[0353] -On -OC n H 2n+1 A linear alkoxy group having n carbon atoms

[0354] nO-C n H 2n+1 O- linear alkoxy group with n carbon atoms

[0355] -V -CH=CH2

[0356] V-CH2=CH-

[0357] -V1 -CH=CH-CH3

[0358] 1V- CH3-CH=CH-

[0359] -2V -CH2-CH2-CH=CH3

[0360] V2-CH2=CH-CH2-CH2-

[0361] -2V1 -CH2-CH2-CH=CH-CH3

[0362] 1V2- CH3-CH=CH-CH2-CH2-

[0363] (Linking base)

[0364] -n- -C n H 2n -

[0365] -nO- -C n H 2n -O-

[0366] -On- -OC n H 2n -

[0367] -COO- -C(=O)-O-

[0368] -OCO- -OC(=O)-

[0369] (Ring structure)

[0370] [Chemistry 48]

[0371]

[0372] In the examples, the properties measured are as follows.

[0373] T ni :Nemetic phase-isotropic liquid phase transition temperature (℃)

[0374] Δn: refractive index anisotropy at 25°C

[0375] γ1: Rotational viscosity at 25°C (mPa·s)

[0376] K11: Elastic constant K11 (pN) at 20°C

[0377] K33: Elastic constant K33 (pN) at 20°C

[0378] Δε: Dielectric anisotropy at 25°C

[0379] The liquid crystal compositions of Examples 1 to 4 and the liquid crystal compositions of Comparative Examples 1 to 4 were respectively injected into the FFS cell to obtain an FFS element. A rectangular wave of 1 kHz and 30 Hz was applied to measure the voltage-transmittance characteristics.

[0380] [Flashing Evaluation]

[0381] The transmittance at a low frequency of 30 Hz varies with flicker, and if the flicker is poor, the transmittance decreases. On the other hand, the transmittance at a high frequency of 1 kHz is not easily affected by flicker. Therefore, the flicker is evaluated using the value of 1 kHz transmittance / 30 Hz transmittance. Furthermore, the smaller the value, the less flicker there is.

[0382] ◎…1kHz transmittance / 30Hz transmittance<1.01

[0383] ○…1.01≤1kHz transmittance / 30Hz transmittance<1.02

[0384] △…1.02≤1kHz transmittance / 30Hz transmittance<1.03

[0385] ×...1.03≤1kHz transmittance / 30Hz transmittance<1.05

[0386] [Table 1]

[0387] Comparative Example 1 Example 1 Comparative Example 2 Example 2 <![CDATA[T NI / ℃]]> 77.0 76.5 77.4 75.6 Δn 0.0934 0.0907 0.0929 0.0925 Δε -2.61 -2.49 -3.13 -3.01 ε⊥ 6.71 5.76 7.46 6.41 γ1 / mPa·s 72 70 82 78 K11 / pN 13.4 14.5 13.1 14.0 K33 / pN 15.9 16.3 15.7 16.1 K22=(K11+K33) / 4 7.3 7.7 7.2 7.5 γ1 / K22 9.901 9.082 11.442 10.293 3-Cy-Cy-V 24 29 24 25 3-Cy-Cy-V1 6 10 11 3-Cy-Cy-Ph-1 8 11 9 8 3-Cy-Ph-O1 12 15 3-Cy-Ph-Ph-1 3-Cy-Ph-Ph-2 5 3 5-Cy-Ph-Ph-2 4 3 V-Cy-Ph-Ph-3 3-Cy-Ph5-O2 14 17 3-Cy-1O-Ph5-O1 5 5 3-Cy-1O-Ph5-O2 10 8 3-Ph-Ph5-O2 10 10 2-Cy-Cy-1O-Ph5-O2 9 3-Cy-Cy-1O-Ph5-O2 16 14 3-Ph-2-Ph-Ph5-O2 6 5 6 3 3-Cy-Ph-Ph5-O2 3-Cy-Ph2-Ph5-O2 4 4 3 2-Cy-Ph2-Ph5-O2 3-Cy-Cy-Ph5-O2 21 23

[0388] [Table 2]

[0389] Comparative Example 3 Example 3 Comparative Example 4 Example 4 <![CDATA[T NI / ℃]]> 77.3 76.6 78.5 76.5 Δn 0.1021 0.1015 0.1028 0.1038 Δε -2.58 -2.58 -3.17 -3.18 ε⊥ 6.71 5.86 7.50 6.62 γ1 / mPa·s 73 70 84 82 K11 / pN 12.9 14.2 12.9 14.2 K33 / pN 14.8 15.9 15.1 16.1 K22=(K11+K33) / 4 6.9 7.5 7.0 7.6 γ1 / K22 10.526 9.301 11.998 10.839 3-Cy-Cy-V 25 29 21 22 3-Cy-Cy-V1 4 10 4 11 3-Cy-Cy-Ph-1 3-Cy-Ph-O1 11 13 3-Cy-Ph-Ph-1 5 5 3-Cy-Ph-Ph-2 6 5 5 4 5-Cy-Ph-Ph-2 5 4 V-Cy-Ph-Ph-3 8 6 3-Cy-Ph5-O2 13 17 3Cy-1O-Ph5-O1 5 5 3-Cy-1O-Ph5-O2 10 8 3-Ph-Ph5-O2 10 11 2-Cy-Cy-1O-Ph5-O2 9 3-Cy-Cy-1O-Ph5-O2 16 13 3-Ph-2-Ph-Ph5-O2 6 4 7 4 3-Cy-Ph-Ph5-O2 3-Cy-Ph2-Ph5-O2 4 5 5 3 2-Cy-Ph2-Ph5-O2 3-Cy-Cy-Ph5-O2 19 23

[0390] [Table 3]

[0391] Comparative Example 1 Example 1 Comparative Example 2 Example 2 Flashing Evaluation × ◎ × ◎

[0392] [Table 4]

[0393] Comparative Example 3 Example 3 Comparative Example 4 Example 4 Flashing Evaluation × ◎ × ◎

[0394] Comparison between Examples 1 to 4 and Comparative Examples 1 to 4 shows that the liquid crystal display element using the specific liquid crystal composition of the present invention also has good response performance and can suppress and reduce flicker.

Claims

1. A liquid crystal display element, comprising: A first substrate and a second substrate, wherein the first substrate and the second substrate are arranged facing each other; a liquid crystal layer, sandwiched between the first substrate and the second substrate and containing a liquid crystal composition; A first electrode, disposed on the first substrate; as well as A second electrode is disposed on the first substrate and generates an electric field with the first electrode. The liquid crystal composition is composed of formula (N-1-1), formula (N-1-2), formula (N-1-3), formula (ii-1.22), formula (ii-1.13), formula (N-1-4-1) and formula (N-1-4-2), and formula (L-4) or formula (L-5), wherein: The compound represented by the general formula (N-1-1) has a content of 13% by mass or more and 17% by mass or less relative to the total amount of the liquid crystal composition; The compound represented by the general formula (N-1-2) has a content of 19% by mass or more and 23% by mass or less relative to the total amount of the liquid crystal composition; The compound represented by the general formula (N-1-3) has a content of 10% by mass or more and 16% by mass or less relative to the total amount of the liquid crystal composition; The compound represented by formula (ii-1.22) has a content of 22% by mass or more and 29% by mass or less relative to the total amount of the liquid crystal composition; The compound represented by formula (ii-1.13) is contained in an amount of 10% by mass or more and 15% by mass or less relative to the total amount of the liquid crystal composition; and The content of the compound represented by the general formula (L-4) is 7% by mass or more and 11% by mass or less relative to the total amount of the liquid crystal composition, and the content of the compound represented by the general formula (L-5) is 9% by mass or more and 10% by mass or less relative to the total amount of the liquid crystal composition; In the formula, R N111 and R N112 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-; In the formula, R N121 and R N122 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-; In the formula, R N131 and R N132 Each independently represents an alkyl group having 1 to 8 carbon atoms, wherein one or two or more non-adjacent -CH2- in the alkyl group may be independently substituted by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-; In the formula, R L41 , R L42 , R L51 and R L52 Each independently represents an alkyl group having 1 to 8 carbon atoms; The compound represented by the general formula (N-1-4-1) has a content of 2% by mass or more and 7% by mass or less relative to the total amount of the liquid crystal composition, and the compound represented by the general formula (N-1-4-2) has a content of 0% by mass or more and 10% by mass or less relative to the total amount of the liquid crystal composition; In the formula, 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, ring A represents 1,4-cyclohexylene or 1,4-phenylene, and X 1241 and X 1242 wherein one of them represents a fluorine atom and the other represents a hydrogen atom, one -CH2- or two or more non-adjacent -CH2- in the 1,4-cyclohexylene group may be substituted with -O-, and one -CH= or two or more non-adjacent -CH= in the 1,4-phenylene group may be substituted with -N=; The compound represented by the general formula (N-1-1) is selected from the compounds represented by the following formula (N-1-1.1); The compound represented by the general formula (N-1-2) is selected from the compounds represented by the following formula (N-1-2.4); The compound represented by the general formula (N-1-3) is selected from the compounds represented by the following formula (N-1-3.2); The compound represented by the general formula (N-1-4-1) is selected from the compounds represented by the formula (N-1-4-1.2), The compound represented by the general formula (N-1-4-2) is selected from the compounds represented by the formula (N-1-4-2.2), The compound represented by the general formula (L-4) is selected from the compounds represented by the formula (L-4.4), The compound represented by the general formula (L-5) is selected from the compounds represented by the formula (L-5.1) or the formula (L-5.2), 2. The liquid crystal display element according to claim 1, which is used in a fringe field switching mode. The liquid crystal display element according to claim 1 , which is used in an in-plane switching mode. A liquid crystal composition, which is the liquid crystal composition according to claim 1.

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