TWI567175B - Liquid crystal compositions and liquid crystal display devices - Google Patents

Description

Liquid crystal composition and liquid crystal display device

The present invention relates to a liquid crystal composition and a liquid crystal display device, and more particularly to a liquid crystal composition having large optical anisotropy, high definition bright spot, appropriate dielectric anisotropy, moderate viscosity, and a liquid crystal composition comprising the same Liquid crystal display device.

For liquid crystal display elements, according to the display mode of liquid crystal, it is divided into PC (phase change), TN (twist nematic), STN (super twisted nematic), and ECB (electrically controlled birefringence). , electronically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching), VA (vertical alignment). According to the driving method of components, it is divided into PM (passive matrix) type and AM (active matrix) type. PM is divided into static (static) and multiplex (multiplex) types. The AM is classified into a TFT (thin film transistor), a MIM (metal insulator metal), and the like. The types of TFTs are amorphous silicon and polycrystalline silicon. The latter is classified into a high temperature type and a low temperature type according to a manufacturing process. The liquid crystal display element is classified into a reflection type using natural light, a transmission type using a backlight, and a semi-transmissive type using both natural light and backlight depending on the type of the light source.

Liquid crystal materials are required to have suitably high dielectric anisotropy, optical anisotropy, and good low temperature miscibility and thermal stability. In addition, the liquid crystal material should also have low viscosity and short response time, low threshold voltage and high contrast. The performance index of the composition is further explained based on a commercially available liquid crystal display element. The temperature range of the nematic phase is related to the operating temperature range of the component. The upper limit temperature of the nematic phase is preferably 70 ° C or more, and the lower limit temperature of the nematic phase is preferably -10 ° C or less. The viscosity of the composition is related to the response time of the component. In order to display an animation in a component, it is preferable that the response time of the component is short. Therefore, it is preferred that the viscosity of the composition is small, and it is more preferable that the viscosity of the composition is small when the temperature is low.

The optical anisotropy of the composition is related to the contrast of the element. In order to maximize the contrast of the liquid crystal display element, the product value (Δn*d) of the optical anisotropy (Δn) of the liquid crystal composition and the thickness (d) of the liquid crystal layer can be set to a fixed value. The appropriate product value depends on the type of operating mode. A suitable value for an element such as a TN mode is about 0.45 μm. In this case, for an element having a small thickness of the liquid crystal layer, a composition having a large optical anisotropy is preferred.

A liquid crystal display element containing a liquid crystal composition having an appropriate optical anisotropy can Increase the contrast.

A single liquid crystal compound is generally difficult to exhibit its characteristics, and it is usually blended with other various liquid crystal compounds to prepare a composition. In the conventional liquid crystal composition, superior characteristics can be obtained, but the nematic phase temperature range of the compound is not wide enough, the clearing point is low, the viscosity is high, the optical anisotropy is not large enough, and the dielectric anisotropy is low. Poor UV and high temperature stability, low voltage retention, small composition for large optical anisotropy, proper dielectric anisotropy, high clearing point and good contrast, directly resulting in low contrast Bad consequences such as slow response.

Accordingly, there is a need for a liquid crystal composition having at least one of characteristics such as large optical anisotropy, high clearing point, moderate viscosity, appropriate dielectric anisotropy, and high contrast.

An object of the present invention is to provide a liquid crystal composition having at least one of characteristics of large optical anisotropy, high clearing point, moderate viscosity, suitably high dielectric anisotropy, and high contrast.

Another object of the present invention is to provide a liquid crystal display element comprising a liquid crystal composition having characteristics of large optical anisotropy, high clearing point, moderate viscosity, suitably high dielectric anisotropy, and the like, such that liquid crystal The display element has characteristics such as high working contrast.

In order to achieve the above object, the present invention provides a liquid crystal composition comprising: 10-40% by weight of the total weight of the liquid crystal composition of a compound of the formula I a compound of the formula II in an amount of from 1 to 30% by weight based on the total weight of the liquid crystal composition a compound of the formula III in an amount of from 10 to 35% by weight based on the total weight of the liquid crystal composition And a compound of the formula IV in an amount of from 0 to 55% by weight based on the total weight of the liquid crystal composition Wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ and R _{6 are the} same or different and each independently represents a fluorinated or unfluorinated alkyl group having 1 to 7 carbon atoms, and the number of carbon atoms is a fluorinated or unfluorinated alkoxy group of 1-7, or a fluorinated or unfluorinated alkenyl group having 2 to 7 carbon atoms; ,ring ,ring And ring Same or different, each independently , or , among them, the ring And ring Not at the same time ; L ₁ represents -H or an alkyl group having 1 to 5 carbon atoms; Z ₁ and Z _{2 are the} same or different and each independently represents a single bond, -CH ₂ CH ₂ -, -CH=CH-, -CH ₂ O- or -COO-;b and c are the same or different and each independently represents 0 or 1: wherein, when b = c = 0, R ₅ and R _{6 are} not alkenyl.

In some embodiments of the invention, it is preferred that the compound of formula I comprises 15-30% by weight of the total weight of the liquid crystal composition; the compound of formula II comprises 5-25 of the total weight of the liquid crystal composition. %; the compound of the formula III is 15-30% by weight based on the total weight of the liquid crystal composition; and the compound of the formula IV is 15-50% by weight based on the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV comprises from 25 to 50% by weight of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV accounts for 30-50% of the total weight of the liquid crystal composition.

In some embodiments of the invention, preferably, the compound of formula I is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula II is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula III is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula IV is selected from one or more of the following compounds: ;as well as Here, R ₅ and R _{6 are the} same or different and each independently represents an alkyl group having 1 to 5 carbon atoms and an alkoxy group having 1 to 5 carbon atoms.

In some embodiments of the invention, the compound of Formula IV-4 comprises from 5 to 25% by weight of the total weight of the liquid crystal composition. As a preferred embodiment, in some embodiments of the invention, the compound of Formula IV-4 It accounts for 10-20% of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV-5 comprises from 0% to 20% by weight of the total weight of the liquid crystal composition. As a preferred embodiment, in some embodiments of the invention, the compound of Formula IV-5 It accounts for 0-15% of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV-6 comprises from 5 to 20% by weight of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV-6 comprises from 6 to 15% by weight of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV-7 comprises from 0% to 25% by weight of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV-7 comprises from 0% to 20% by weight of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV-9 comprises from 0% to 20% by weight of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV-11 comprises from 0 to 15% by weight of the total weight of the liquid crystal composition. As a preferred embodiment, in some embodiments of the invention, the compound of Formula IV-11 It accounts for 0-10% of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of Formula IV-12 comprises from 0 to 15% by weight of the total weight of the liquid crystal composition. As a preferred embodiment, in some embodiments of the invention, the compound of Formula IV-12 It accounts for 0-10% of the total weight of the liquid crystal composition.

In some embodiments of the invention, preferably, the compound of formula IV-1 is selected from one or more compounds consisting of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula IV-2 is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula IV-3 is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of formula IV-4 is selected from one or more compounds consisting of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula IV-5 is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula IV-6 is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of formula IV-7 is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of formula IV-8 is selected from one or more compounds consisting of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of formula IV-9 is selected from one or more compounds consisting of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula IV-10 is selected from one or more compounds consisting of: ;as well as

In some embodiments of the invention, preferably, the compound of Formula IV-11 is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula IV-12 is selected from one or more of the following compounds: ;as well as

In some embodiments of the invention, preferably, the compound of Formula IV-13 is selected from one or more of the following compounds: ;as well as

Another aspect of the present invention provides a liquid crystal display device comprising the liquid crystal composition of the present invention.

The present invention determines a liquid crystal composition including the above liquid crystal compound by a combination test with the above compound, and has a large optical anisotropy, a suitably high dielectric anisotropy, a high clearing point, and the like. The liquid crystal composition of the present invention is suitable for use in a liquid crystal display device.

In the present invention, unless otherwise specified, the ratios are all by weight, all temperatures are in degrees Celsius, and the response time data is selected to have a cell thickness of 7 μm.

The invention will now be described in connection with specific embodiments. It is to be understood that the following examples are illustrative of the invention and are not intended to limit the invention. Other combinations and various modifications within the inventive concept can be made without departing from the spirit or scope of the invention.

For ease of expression, in the following examples, the group structure of the liquid crystal composition is represented by the codes listed in Table 1:

Take a compound of the following structural formula as an example:

The structural formula is expressed by the code listed in Table 1, and can be expressed as: nCGUF, where n in the code represents the number of carbon atoms of the left-end alkyl group, for example, n is "2", that is, the alkyl group is -C ₂ H ₅ C in the code stands for "cyclohexane group", G in the code stands for "2-fluoro-1,4-phenylene", and U in the code stands for "2,5-difluoro-1,4-"Phenyl", F in the code stands for "fluoro substituent".

The shorthand code for the test project in the following examples is as follows:

Cp: clearing point (nematic-isotropic phase transition temperature, 25 ° C)

△n: optical anisotropy (589 nm, 25 ° C)

△ ε: dielectric anisotropy (1 kHz, 25 ° C)

η: flow viscosity (mm ² ‧ s ^-1 , 25 ° C, unless otherwise stated)

Among them, the optical anisotropy was measured using an Abbe refractometer under a sodium light (589 nm) light source at 25 ° C; the dielectric test box was a TN100 type, and the cell thickness was 7 μm.

Vth test conditions: C/1KHZ, JTSB7.0.

The components used in the following examples can be synthesized by a known method or obtained commercially. These synthetic techniques are conventional, and each of the obtained liquid crystal compounds has been tested to meet the standards of electronic compounds.

A liquid crystal combination was prepared according to the ratio of each liquid crystal composition specified in the following examples. Things. The preparation of the liquid crystal composition is carried out according to a conventional method in the art, such as heating, ultrasonic wave, suspension, etc., in a predetermined ratio.

The liquid crystal composition given in the following examples was prepared and studied. The composition of each liquid crystal composition and the test results of its performance parameters are shown below.

Comparative example 1

The liquid crystal compositions of Comparative Example 1 were prepared according to the respective compounds and weight percentages listed in Table 2, and were filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

Comparative example 2

According to the compounds listed in Table 3 and the weight percentages, the liquid crystal composition of Comparative Example 2 was prepared and filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

Example 1

The liquid crystal composition of Example 1 was prepared according to each compound and weight percentage listed in Table 4, and was filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

Example 2

The liquid crystal composition of Example 2 was prepared according to each compound and weight percentage listed in Table 5, and was filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

Example 3

The liquid crystal composition of Example 3 was prepared according to each compound and weight percentage listed in Table 6, and was filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

Example 4

The liquid crystal composition of Example 4 was prepared according to each compound and weight percentage listed in Table 7, and was filled in the performance test between the two substrates of the liquid crystal display. The test data are as shown in the following table: Table 7 liquid crystal composition formula and Test performance

Example 5

The liquid crystal composition of Example 5 was prepared according to each compound and weight percentage listed in Table 8, and was filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

Example 6

The liquid crystal composition of Example 6 was prepared according to each compound and weight percentage listed in Table 10, and was filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

Example 7

The liquid crystal composition of Example 7 was prepared according to each compound and weight percentage listed in Table 10, and was filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

Example 8

The liquid crystal composition of Example 7 was prepared according to each compound and weight percentage listed in Table 11, and was filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

Referring to Comparative Examples 1 and 2, it can be seen from the test data of Examples 1, 2, 3, 4, 5, 6, 7, and 8 above that the liquid crystal composition provided by the present invention has a large optical anisotropy and a suitably high dielectric layer. The electrical anisotropy and high clearing point are suitable for use in liquid crystal display devices, so that the liquid crystal display has large optical anisotropy, high operating temperature and high contrast characteristics.

Claims (8)

A liquid crystal composition comprising: 10-40% by weight of the total weight of the liquid crystal composition of a compound of formula I a compound of the formula II in an amount of from 1 to 30% by weight based on the total weight of the liquid crystal composition a compound of the formula III in an amount of 10-35% by weight based on the total weight of the liquid crystal composition And a compound of the formula IV in an amount of from 1 to 55% by weight based on the total weight of the liquid crystal composition Wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ and R _{6 are the} same or different and each independently represents a fluorinated or unfluorinated alkyl group having 1 to 7 carbon atoms, and the number of carbon atoms is a fluorinated or unfluorinated alkoxy group of 1-7, or a fluorinated or unfluorinated alkenyl group having 2 to 7 carbon atoms; ,ring ,ring And ring Same or different, each independently or , among them, the ring And ring Not at the same time ; L ₁ represents -H or an alkyl group having 1 to 5 carbon atoms; Z ₁ and Z _{2 are the} same or different and each independently represents a single bond, -CH ₂ CH ₂ -, -CH=CH-, -CH ₂ O- or -COO-; b and c are the same or different and each independently represents 0 or 1; wherein, when b = c = 0, R ₅ and R _{6 are} not alkenyl groups, and the compound of the formula IV is selected from One or more of the following compounds: ;as well as Wherein R ₅ and R _{6 are the} same or different and each independently represents an alkyl group having 1 to 5 carbon atoms and an alkoxy group having 1 to 5 carbon atoms, and the compound of the formula IV-4 accounts for 5-25% by weight of the total liquid crystal composition; the compound of the formula IV-5 is 0-20% by weight based on the total weight of the liquid crystal composition; the compound of the formula IV-6 is 5-20% by weight based on the total weight of the liquid crystal composition The compound of the formula IV-7 accounts for 0-25% of the total weight of the liquid crystal composition; the compound of the formula IV-9 accounts for 0-20% of the total weight of the liquid crystal composition; the compound of the formula IV-11 accounts for The total weight of the liquid crystal composition is 0-15%; the compound of the formula IV-12 is 0-15% by weight based on the total weight of the liquid crystal composition. The liquid crystal composition according to claim 1, wherein the compound of the formula I is selected from the group consisting of one or more of the following compounds: ;as well as The liquid crystal composition according to claim 1, wherein the compound of the formula II is selected from the group consisting of one or more of the following compounds: ;as well as The liquid crystal composition of the present invention is modified as set forth in the first paragraph of claim 1 of the present invention, wherein the compound of the formula III is selected from one or more of the following compounds: ;as well as The liquid crystal composition according to claim 1, wherein the compound of the formula IV-1 is selected from the group consisting of one or more of the following compounds: ;as well as The compound of formula IV-2 is selected from one or more of the following compounds: ;as well as The compound of formula IV-3 is selected from one or more of the following compounds: ;as well as The compound of formula IV-4 is selected from one or more compounds consisting of the following compounds: ;as well as The compound of formula IV-5 is selected from one or more compounds consisting of the following compounds: ;as well as The compound of formula IV-6 is selected from one or more compounds consisting of the following compounds: ;as well as The compound of formula IV-7 is selected from one or more of the following compounds: ;as well as The compound of formula IV-8 is selected from one or more compounds consisting of the following compounds: ;as well as The compound of formula IV-9 is selected from one or more of the following compounds: ;as well as The compound of formula IV-10 is selected from one or more of the following compounds: ;as well as The compound of formula IV-11 is selected from one or more compounds consisting of the following compounds: ;as well as The compound of formula IV-12 is selected from one or more compounds consisting of the following compounds: ;as well as The compound of formula IV-13 is selected from one or more of the following compounds: ;as well as The liquid crystal composition according to any one of claims 1 to 5, wherein the compound of the formula I accounts for 15-30% by weight of the total weight of the liquid crystal composition; 5 to 25% by weight based on the total weight of the liquid crystal composition; the compound of the formula III is 15 to 30% by weight based on the total weight of the liquid crystal composition; and the compound of the formula IV is 15 to 50% by weight based on the total weight of the liquid crystal composition . The liquid crystal composition according to claim 6, wherein the liquid crystal composition comprises: 6% of the compound IV-4-6 based on the total weight of the liquid crystal composition; and 6% by weight of the total liquid crystal composition Compound IV-4-9; compound III-2 in an amount of 22% by weight based on the total weight of the liquid crystal composition; compound IV-13-6 in an amount of 7% by weight based on the total weight of the liquid crystal composition; 7% by weight based on the total weight of the liquid crystal composition Compound II-2; a compound II-5 which is 5% by weight based on the total weight of the liquid crystal composition; a compound 1-2 in an amount of 8% by weight based on the total weight of the liquid crystal composition; and a compound 1-3 in an amount of 8% by weight based on the total weight of the liquid crystal composition; 1-4% by weight of the compound I-4; 4% by weight of the total weight of the liquid crystal composition of the compound IV-6-1; 4% by weight of the total weight of the liquid crystal composition of the compound IV-6-4; 5% by weight of the compound IV-7-3; 5% of the total weight of the liquid crystal composition of the compound IV-7-1; and 5% of the total weight of the liquid crystal composition of the compound IV-7-5, or the liquid crystal The composition comprises: compound IV-4-6 in an amount of 6% by weight based on the total weight of the liquid crystal composition; compound IV-4-9 in an amount of 6% by weight based on the total weight of the liquid crystal composition; and compound III in an amount of 20% by weight based on the total weight of the liquid crystal composition -2; compound IV-13-6; 5% by weight of the total weight of the liquid crystal composition of the compound II-2; 5% of the total weight of the liquid crystal composition of the compound II-5; a compound 1-1, which is 7% by weight based on the total weight of the liquid crystal composition; a compound 1-2, which accounts for 8% by weight of the total weight of the liquid crystal composition; and a compound 1-3, which accounts for 8% by weight of the total weight of the liquid crystal composition; a compound I-4 of 8% by weight of the composition; 5% of the total weight of the liquid crystal composition of the compound IV-6-1; Compound IV-6-4, which is 5% by weight based on the total weight of the liquid crystal composition; Compound IV-7-3, which is 4% by weight based on the total weight of the liquid crystal composition; Compound IV-7-1, which is 4% by weight based on the total weight of the liquid crystal composition And a compound IV-7-5 which accounts for 4% by weight of the total weight of the liquid crystal composition, or the liquid crystal composition comprises: 6% of the compound IV-4-6 based on the total weight of the liquid crystal composition; 6% by weight of compound IV-4-9; compound III-2, which accounts for 22% by weight of the total weight of the liquid crystal composition; compound IV-9-2, based on 7% by weight of the total weight of the liquid crystal composition, based on the total weight of the liquid crystal composition 7% of the compound II-2; the compound II-5 which is 5% by weight based on the total weight of the liquid crystal composition; the compound 1-2 which accounts for 8% by weight of the total weight of the liquid crystal composition; and the compound I which accounts for 8% by weight of the total weight of the liquid crystal composition -3; Compound I-4 in an amount of 8% by weight based on the total weight of the liquid crystal composition; Compound IV-6-1 in an amount of 4% by weight based on the total weight of the liquid crystal composition; and Compound IV-6- in 4% by weight based on the total weight of the liquid crystal composition 4; compound IV-7-3, 5% by weight based on the total weight of the liquid crystal composition; compound IV-7-1, 5% by weight based on the total weight of the liquid crystal composition; and compound IV-, 5% by weight based on the total weight of the liquid crystal composition 7-5 Or, the liquid crystal composition comprises: 6% of the total weight of the liquid crystal composition of the compound IV-4-6; a compound IV-4-9 which is 6% by weight based on the total weight of the liquid crystal composition; a compound III-2 which accounts for 21% by weight of the total weight of the liquid crystal composition; and a compound IV-12-10 which accounts for 7% by weight of the total weight of the liquid crystal composition; a liquid crystal composition of 7% by weight of the compound II-2; 5% of the total weight of the liquid crystal composition of the compound II-5; 10% by weight of the total weight of the liquid crystal composition of the compound 1-2; 8% by weight of compound 1-3; 1-4% by weight of the total weight of the liquid crystal composition; 4% by weight of the total weight of the liquid crystal composition of the compound IV-6-1; 3% by weight based on the total weight of the liquid crystal composition Compound IV-6-4; compound IV-7-3, 5% by weight based on the total weight of the liquid crystal composition; compound IV-7-1, 5% by weight based on the total weight of the liquid crystal composition; and the total weight of the liquid crystal composition 5% of the compound IV-7-5, or the liquid crystal composition comprises: 6% of the total weight of the liquid crystal composition of the compound IV-4-6; 6% of the total weight of the liquid crystal composition of the compound IV-4- 9; compound III-2; 22% by weight of the total weight of the liquid crystal composition; compound IV-9-2; 7% by weight of the total weight of the liquid crystal composition; The liquid crystal composition is 5% by weight of the compound II-5; the compound I-2 is 8% by weight of the total liquid crystal composition; a compound I-3 which accounts for 8% by weight of the total weight of the liquid crystal composition; a compound I-4 which accounts for 8% by weight of the total weight of the liquid crystal composition; and a compound IV-6-1 which accounts for 4% by weight of the total weight of the liquid crystal composition; 4% by weight of the composition of the compound IV-6-4; 5% of the total weight of the liquid crystal composition of the compound IV-5-1; 5% of the total weight of the liquid crystal composition of the compound IV-5-5; The liquid crystal composition has a total weight of 5% of the compound IV-5-3, or the liquid crystal composition comprises: 6% of the total weight of the liquid crystal composition of the compound IV-4-6; 6% by weight of the total liquid crystal composition Compound IV-4-9; compound III-2 in an amount of 20% by weight based on the total weight of the liquid crystal composition; compound II-2 in an amount of 4% by weight based on the total weight of the liquid crystal composition; and compound II in an amount of 3% by weight based on the total weight of the liquid crystal composition -5; compound IV-9-2; 10% by weight of the total weight of the liquid crystal composition of the compound I-2; the total weight of the liquid crystal composition of 8% of the compound I-3; a compound I-4 which is 8% by weight based on the total weight of the liquid crystal composition; a compound IV-12-10 which accounts for 5% by weight of the total weight of the liquid crystal composition; and a compound IV-6-1 which accounts for 5% by weight of the total weight of the liquid crystal composition; The 5% by weight of the total composition crystalline compound Ⅳ-6-4; 4% of the total weight of the composition of the liquid crystal compound Ⅳ-7-3; a compound IV-7-1 which is 4% by weight based on the total weight of the liquid crystal composition; and a compound IV-7-5 which accounts for 4% by weight of the total weight of the liquid crystal composition, or the liquid crystal composition comprises: the total weight of the liquid crystal composition 6% of the compound IV-4-6; 6% of the total weight of the liquid crystal composition of the compound IV-4-9; 21% by weight of the total weight of the liquid crystal composition of the compound III-2; 4 of the total weight of the liquid crystal composition % of compound II-2; compound II-5 in an amount of 3% by weight based on the total weight of the liquid crystal composition; compound IV-9-2 which is 10% by weight based on the total weight of the liquid crystal composition; and 7% by weight of the total weight of the liquid crystal composition I-2; Compound I-3; 8% by weight based on the total weight of the liquid crystal composition; Compound 1-4, 5% by weight based on the total weight of the liquid crystal composition; a compound IV-6-1 which accounts for 6% by weight of the total weight of the liquid crystal composition; a compound IV-6-4 which accounts for 5% by weight of the total weight of the liquid crystal composition; and a compound IV-5- which accounts for 4% by weight of the total weight of the liquid crystal composition 1; compound IV-5-5 which accounts for 4% by weight of the total weight of the liquid crystal composition; and compound IV-5-3 which accounts for 4% of the total weight of the liquid crystal composition, or the liquid crystal composition contains: a compound IV-4-6 of 6% by weight of the composition; a compound IV-4-9 of 6% by weight of the total weight of the liquid crystal composition; a compound III-2 which accounts for 24% by weight of the total weight of the liquid crystal composition; a compound IV-9-2 which accounts for 7% by weight of the total weight of the liquid crystal composition; and a compound II-2 which accounts for 7% by weight of the total weight of the liquid crystal composition; 1-5% of the total weight of the composition of the compound II-5; 1-2% by weight of the total weight of the liquid crystal composition of the compound I-2; 7% by weight of the total weight of the liquid crystal composition of the compound I-3; % of compound I-4; 4% by weight of the liquid crystal composition of the compound IV-6-1; 4% by weight of the total weight of the liquid crystal composition of the compound IV-6-4; 6% by weight of the total liquid crystal composition Compound IV-7-3; Compound IV-7-1; 5% by weight based on the total weight of the liquid crystal composition; and Compound IV-7-5, 5% by weight based on the total weight of the liquid crystal composition. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 7.