TWI554597B - A liquid crystal composition having a high transmittance and a display device thereof - Google Patents

Description

Liquid crystal composition with high transmittance and display device thereof

The present invention relates to a liquid crystal composition, and more particularly to a liquid crystal composition for electro-optical purposes and a liquid crystal display comprising the liquid crystal composition, and more particularly to a display and an in-plane switching (IPS) type including active matrix addressing of the liquid crystal composition. Display.

Liquid crystal displays (LCDs) have achieved rapid development due to their small size, light weight, low power consumption and excellent display quality, especially in portable electronic information products. With the increase in the size of LCD screens for portable computers, office applications, and video applications, in order to enable liquid crystal displays to be used for large screen displays and eventually replace cathode ray tube displays (Cathode Ray Tubes, CRTs), Several issues need to be resolved. Such as improving the viewing angle characteristics and improving the response speed. The narrow viewing angle of the LCD means that the contrast is significantly reduced when viewed away from the normal direction of the liquid crystal cell. For grayscale and color display, grayscale and color inversion occur when the viewing angle is large, which seriously affects the LCD. Display quality. The perspective problem has become a major obstacle to LCD replacement of CRT technology.

The viewing angle problem of the LCD is determined by the working principle of the liquid crystal itself. The liquid crystal molecules are rod-shaped, and different molecular arrangements correspond to different optical anisotropies. The smaller the angle between the incident light and the liquid crystal molecules, the smaller the birefringence; on the contrary, the greater the birefringence. The angle between the light incident on the liquid crystal cell at different angles from the normal direction of the display screen is different from the director of the liquid crystal molecules, so that the effective optical path difference Δn*d is different at different viewing angles. And the best optical path difference of the liquid crystal cell It is designed to be perpendicular to the normal direction of the box. For obliquely incident light, the minimum transmittance increases with the increase of the angle, and the contrast decreases. When the angle is large enough, even the contrast inversion occurs.

At present, many methods for solving perspective problems have been proposed, such as: Optically Compensated Bend (OCB) mode, In-Plane Switching (IPS), and Free Fall Sensor (FFS). And Multi-Domain Vertical Alignment (MVA).

They all have their own advantages and disadvantages. The multi-domain vertical arrangement mode has high contrast and fast response characteristics, but it requires a two-axis compensation film and two ellipses, so the cost is high, and the OCB mode is difficult to use AC voltage. In order to maintain stable control, the transmittances of three kinds of monochromatic lights of R, G, and B are different. In addition, in the absence of field, the molecules in the liquid crystal cell are arranged in a direction parallel to the substrate, in order to achieve a curved arrangement, It takes a few seconds to pre-set the voltage on the box, and then this arrangement can be maintained at a lower voltage, which is inconvenient for use. The coplanar conversion mode requires only a linear polarizer without the need for a compensation film, but its response speed is too slow to display a fast moving picture. Since the IPS mode and the FFS mode are simple to manufacture and have a wide viewing angle, they are the most attractive way to improve the viewing angle characteristics and achieve large-area display.

In the early 1970s, experimental studies were conducted on the basic electro-optical properties of uniformly aligned and twisted, nematic liquid crystal IPS modes, characterized in that a pair of electrodes 3 were fabricated on the same substrate 2, and the other There is no electrode 3 on the substrate 2, and the arrangement of the liquid crystal molecules 4 is controlled by the transverse electric field 5 applied between the electrodes 3. Therefore, this mode can also be referred to as a transverse field mode. In the IPS mode, the nematic liquid crystal molecules 4 are uniformly arranged in parallel between the two substrates 2, and the two polarizing plates 1 are placed orthogonally. The display principle is shown in Figure 1. The IPS mode is incident when no electric field is applied. The light is blocked by two orthogonal polarizing plates 1 to be in a dark state. As shown in FIG. 2, when the electric field 5 is applied, the liquid crystal molecules 4 are rotated to cause a delay, and thus light is emitted from the two orthogonal polarizing plates 1.

The IPS mode may use a positive liquid crystal or a negative liquid crystal because the transmittance saturation voltage decreases as the absolute value of Δε increases, so the transmittance saturation voltage of the positive liquid crystal is lower than that of the negative liquid crystal, and The response speed is faster, but the negative liquid crystal is better than the positive liquid crystal. The reason is shown in Fig. 3 and Fig. 4, mainly due to the difference in the rotation of the positive and negative liquid crystals under the electric field.

The patent CN101270287A, which was applied by Samsung Electronics on February 20, 2008, has disclosed a scheme of positive and negative liquid crystal compounding, but only mentions that a positive component is added to the negative liquid crystal, and the liquid crystal as a whole is still negative. Chisso Co., Ltd. also disclosed an experimental scheme for positive and negative liquid crystal compounding in the patent application JP2002156619A on November 21, 2000. The above two schemes do not mention in detail the small amount of negative liquid crystal monomer pairs in the positive liquid crystal. The improvement of the transmittance of the IPS liquid crystal display.

It is an object of the present invention to provide a liquid crystal composition for use in an IPS mode in which one or more negative liquid crystal monomers are doped in a positive dielectric anisotropic IPS liquid crystal, surprisingly found Through this doping mode, ε _∥ and ε _{液晶 of the} liquid crystal can be increased while maintaining Δ ε , where Δ ε = ε _∥ - ε _⊥ , Δ ε is dielectric anisotropy, ε _∥ In order to be parallel to the dielectric constant in the molecular axis direction, ε _⊥ is a dielectric constant perpendicular to the molecular axis direction, a liquid crystal having Δ ε>0 is referred to as a positive liquid crystal, and a liquid crystal having Δ ε<0 is referred to as a negative liquid crystal.

Transmittance formula based on IPS mode. Transmittance △ ε / ε _⊥ ("□" means "inverse proportion" relationship). By doping the above negative liquid crystal monomer into the positive dielectric anisotropy IPS liquid crystal, the obtained liquid crystal composition can maintain a fast response of the positive IPS liquid crystal, a low driving voltage, a high clearing point, and a low The rotational viscosity, suitable optical anisotropy, and suitable dielectric anisotropy, while greatly improving the transmittance of the liquid crystal display, and penetrating compared with the existing positive dielectric anisotropic IPS liquid crystal. The rate can be increased by 5~20%.

In order to solve the above problems, the present invention provides a liquid crystal composition having positive dielectric anisotropy, the liquid crystal composition comprising: one or more compounds selected from the group consisting of Formula I, Formula II, Formula III, and combinations thereof As the first ingredient And one or more compounds selected from the group consisting of Formula IV, Formula V, Formula VI, and combinations thereof as a second component (VI); wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ and R _{10 are the} same or different and each independently represents H and has 1 carbon atom An alkyl or alkoxy group of -7, a fluoroalkyl group or a fluoroalkoxy group having 1 to 7 carbon atoms or an alkenyl group or an alkenyloxy group having 2 to 7 carbon atoms; with The same or different, each independently selected from with Composition; Z ₁ , Z ₂ and Z _{3 are the} same or different and each independently represents a single bond, -CH=CH-, -COO-, -OCO-, -CH ₂ O-, -OCH ₂ -, -OCF ₂ -, -CF ₂ O-, -(CH ₂ ) ₄ -, -C ₂ F ₄ -, -CH ₂ CF ₂ -, -CF=CF- or -CH ₂ CH ₂ -; L ₄ and L _{9 is the} same or different and each independently represents H, F, Cl, an alkyl or alkoxy group having 1 to 7 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms, and 1 to 1 carbon atom; One of a fluoroalkoxy group of 5, a fluoroalkenyl group having 2 to 5 carbon atoms or a fluoroalkenyloxy group having 2 to 5 carbon atoms; L ₁ , L ₂ , L ₃ , L ₅ , L ₆ , L ₇ , L ₈ and L _{10 are the} same or different and each independently represents H or F; L ₁₁ , L ₁₂ , L ₁₃ , L ₁₄ , L ₁₅ , L ₁₆ , L ₁₇ and L _{18 are the} same or different Each of them independently represents one of F, Cl, CN, CH ₃ or OCH ₃ ; m, n, a, b, p, q, s and g are the same or different and each independently represents 0 or 1.

In the positive dielectric anisotropic liquid crystal composition of the present invention, the first component dielectric anisotropy of the compound of the group of the general formula I, the general formula II, the general formula III and the combination thereof is positive, The second component-separating dielectric anisotropy of the compound of Formula IV, Formula V, Formula VI, and combinations thereof is negative.

In some embodiments of the invention, the compound of Formula I comprises from 5 to 40% by weight of the total weight of the liquid crystal composition, and the compound of Formula II comprises from 15 to 50% by weight of the total weight of the liquid crystal composition The compound of the formula III accounts for 20-60% by weight of the total weight of the liquid crystal composition, and the compound of the group of the formula IV, the formula V, the formula VI and the combination thereof accounts for the total weight of the liquid crystal composition. 0-40%.

In some embodiments of the invention, it is preferred that the compound of the group of Formula IV, Formula V, Formula VI, and combinations thereof, is from 5 to 30% by weight based on the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of formula I is preferably free from one or more of the following compounds: ;as well as Wherein R ₁ represents H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group or an alkene having 2 to 5 carbon atoms; One of a base or an alkenyloxy group.

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

In some embodiments of the invention, the compound of Formula II is selected from one or more of the following compounds: ;as well as Wherein R ₂ represents H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group or an alkene having 2 to 5 carbon atoms; One of a base or an alkenyloxy group.

In some embodiments of the invention, the compound of formula II is particularly preferably free of one or more of the following compounds: ;as well as

In some embodiments of the invention, the compound of Formula III is selected from one or more of the following compounds: ;as well as Wherein R ₃ and R _{4 are the} same or different and each independently represents H, an alkyl group or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group; Or one of an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms.

In some embodiments of the invention, the compound of formula II is particularly preferably free of one or more of the following compounds: ;as well as

In some embodiments of the invention, the compound of 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 H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group; Or one of an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms.

In some embodiments of the invention, the compound of formula IV is particularly preferably free of one or more of the following compounds: ;as well as

In some embodiments of the invention, the compound of Formula V is selected from one or more of the following compounds: ;as well as Wherein R ₇ and R _{8 are the} same or different and each independently represents H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group; Or one of an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms.

In some embodiments of the invention, the compound of formula V is particularly preferably free of one or more of the following compounds: ;as well as

In some embodiments of the invention, the compound of Formula VI is selected from one or more of the following compounds: ;as well as Wherein R ₉ and R _{10 are the} same or different and each independently represents H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group; Or one of an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms.

In some embodiments of the invention, the compound of formula VI is particularly preferably free of one or more of the following compounds: ;as well as

Another aspect of the present invention provides a liquid crystal display having an IPS display mode, the liquid crystal display comprising the liquid crystal composition of the present invention.

Compared with the existing liquid crystal composition, the liquid crystal composition of the present invention produces a beneficial technical effect, that is, the liquid crystal composition of the present invention is determined by a combination experiment with the above compound, and by comparison with a control, it is determined that the above liquid crystal combination is included. Liquid crystal medium of the material, which can increase the ε _∥ and ε _液晶 of the liquid crystal while maintaining Δ ε, greatly improving the transmittance of the liquid crystal display, and the existing positive dielectric anisotropy IPS liquid crystal phase Specific transmittance can be increased by 5~20%, while maintaining fast response of positive IPS liquid crystal, low driving voltage, high clearing point, low rotational viscosity, suitable optical anisotropy and suitable dielectric To the opposite sex.

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.

1‧‧‧Polarizer

2‧‧‧Substrate

3‧‧‧Electrode

4‧‧‧liquid crystal molecules

5‧‧‧ electric field

Figure 1 is a schematic diagram of the power-off state of the IPS mode.

Figure 2 is a schematic diagram of the power-on state of the IPS mode.

Fig. 3 is a schematic view showing the rotation of a positive dielectric anisotropic liquid crystal composition under an electric field.

Fig. 4 is a schematic view showing the rotation of a negative dielectric anisotropic liquid crystal composition under an electric field.

The invention will now be described in connection with specific embodiments. It should be noted that, although the present invention has been described in detail below with reference to the general description and specific embodiments, some modifications or improvements may be made thereto based on the present invention. Obvious. Therefore, such modifications or improvements made without departing from the spirit of the invention are intended to be within the 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: Table 1 Group structure code of the liquid crystal compound

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

The structural formula is expressed by the code listed in Table 2, and can be expressed as: nCPUF, where n in the code represents the number of C atoms of the left-end alkyl group, for example, n is "3", that is, the alkyl group is -C ₃ H ₇ ; C in the code represents a cyclohexane group;

The structural formula is expressed as the code listed in Table 2, and can be expressed as: 3ClOWO2, the alkyl group in the code is -C ₃ H ₇ ; C in the code represents cyclohexane group; W in the code represents 2, 3- 2 Fluorine-1,4-phenylene; O in the code represents an oxygen substituent.

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

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 composition was prepared in accordance with the ratio of each liquid crystal composition specified in the following examples. 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.

Table 2 and Table 3 are the test results of the composition, the ratio of the liquid crystal composition of the comparative example, and the performance test between the two substrates filled in the liquid crystal display, in order to facilitate and explain the liquid of the present invention. The crystal composition was subjected to performance comparison.

Comparative Example 1

The liquid crystal composition of Comparative Example 1 was prepared according to each compound and weight percentage listed in Table 2, and was 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 3, and was filled in the performance test between the two substrates of the liquid crystal display. The test data are as follows:

The results of comparison between Example 1 and Comparative Example 1 can be known from the above experimental data. Under the same conditions, Example 1 significantly improved the transmittance of IPS liquid crystal compared to Comparative Example 1, while having a high clearing point, a low rotational viscosity, a suitable optical anisotropy, and a suitable dielectric. Anisotropy.

Example 2

The liquid crystal composition of Example 2 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:

The results of comparison between Example 2 and Comparative Example 1 can be known from the above experimental data. In the same article In the second embodiment, the transmittance of the IPS liquid crystal is significantly improved compared with the control example 1, and has a high clearing point, a low rotational viscosity, a suitable optical anisotropy, and a suitable dielectric orientation. opposite sex.

Example 3

The liquid crystal composition of Example 3 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:

The results of comparison between Example 3 and Comparative Example 1 can be known from the above experimental data. Under the same conditions, Example 3 significantly improved the transmittance of IPS liquid crystal compared to Comparative Example 1, while having a high clearing point, a low rotational viscosity, a suitable optical anisotropy, and a suitable dielectric. Anisotropy.

Comparative Example 2

The liquid crystal compositions of Comparative Example 2 were prepared according to the respective compounds and weight percentages listed in Table 6, and filled in the performance test between the two substrates of the liquid crystal display. The test data are shown in the following table:

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 follows:

The results of comparison between Example 4 and Comparative Example 2 can be seen from the above experimental data. Under the same conditions, Example 4 significantly improved the transmittance of IPS liquid crystal compared to Comparative Example 2, while having a high clearing point, a low rotational viscosity, a suitable optical anisotropy, and a suitable dielectric. Anisotropy.

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:

The results of comparison between Example 5 and Comparative Example 2 can be seen from the above experimental data. Under the same conditions, Example 5 significantly improved the transmittance of IPS liquid crystal compared to Comparative Example 2, while having a high clearing point, a low rotational viscosity, a suitable optical anisotropy, and a suitable dielectric. Anisotropy.

Comparative Example 1 is an in-vehicle IPS product with the advantages of high clearing point and good reliability, but low transmittance. In the first embodiment, the second embodiment and the third embodiment, by using a method of doping a negative monomer, three products having a higher ε ⊥ / Δ ε are obtained, and the transmittance is higher in application.

Comparative Example 2 is a commercially available IPS product for mobile phones, which has the advantages of large dielectric power and fast response speed, but the transmittance is low. In Example 4 and Example 5, by using a method of doping a negative monomer, two products having a higher ε ⊥ / Δ ε were obtained, and the transmittance was higher in application.

It can be seen from the above Comparative Example 1, Comparative Example 2, Example 1, Example 2, Example 3, Example 4 and Example 5 that the liquid crystal composition provided by the present invention significantly improves the transmittance of the IPS liquid crystal. It also has a high clearing point, a low rotational viscosity, a suitable optical anisotropy and a suitable dielectric anisotropy.

However, the above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, so that it is generally known or familiar in the technical field. Equivalent changes or modifications made by this technology that are equivalent or easy to change without departing from the spirit and scope of the present invention shall be covered by the scope of the patent.

Claims (10)

A positive dielectric anisotropic liquid crystal composition comprising: one or more compounds selected from the group consisting of Formula I, Formula II, Formula III, and combinations thereof as a first component And one or more compounds selected from the group consisting of Formula IV, Formula V, Formula VI, and combinations thereof as a second component Wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ and R _{10 are the} same or different and each independently represents H and an alkane having 1 to 7 carbon atoms; a group of alkoxy or alkoxy, a fluoroalkyl or fluoroalkoxy group having 1 to 7 carbon atoms or an alkenyl group or alkenyloxy group having 2 to 7 carbon atoms; with The same or different, each independently selected from with Composition; Z ₁ , Z ₂ and Z _{3 are the} same or different and each independently represents a single bond, -CH=CH-, -COO-, -OCO-, -CH ₂ O-, -OCH ₂ -, -OCF ₂ -, -CF ₂ O-, -(CH ₂ ) ₄ -, -C ₂ F ₄ -, -CH ₂ CF ₂ -, -CF=CF- or -CH ₂ CH ₂ -; L ₄ and L _{9 is the} same or different and each independently represents H, F, Cl, an alkyl or alkoxy group having 1 to 7 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms, and 1 to 1 carbon atom; One of a fluoroalkoxy group of 5, a fluoroalkenyl group having 2 to 5 carbon atoms or a fluoroalkenyloxy group having 2 to 5 carbon atoms; L ₁ , L ₂ , L ₃ , L ₅ , L ₆ , L ₇ , L ₈ and L _{10 are the} same or different and each independently represents H or F; L ₁₁ , L ₁₂ , L ₁₃ , L ₁₄ , L ₁₅ , L ₁₆ , L ₁₇ and L _{18 are the} same or different Each of which independently represents one of F, Cl, CN, CH ₃ or OCH ₃ ; m, n, a, b, p, q, s, and g are the same or different, each independently representing 0 or 1, wherein The dielectric anisotropy of the first component of the compound of Formula I, Formula II, Formula III, and combinations thereof is positive, and Formula IV, Formula V, Formula VI, and combined The dielectric anisotropy of the second component of the compound composition is negative. The positive dielectric anisotropic liquid crystal composition according to claim 1, wherein The compound of the formula I accounts for 5-40% by weight of the total liquid crystal composition, and the compound of the formula II accounts for 15-50% by weight of the total liquid crystal composition, and the compound of the formula III accounts for the total weight of the liquid crystal composition. 20-60% of the compound of the formula IV, the formula V, the formula VI and combinations thereof constitute 0-40% of the total weight of the liquid crystal composition. The positive dielectric anisotropic liquid crystal composition according to claim 2, wherein the compound of the formula I is selected from one or more of the following compounds: ;as well as Wherein R ₁ represents H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group or an alkene having 2 to 5 carbon atoms; One of a base or an alkenyloxy group. The positive dielectric anisotropic liquid crystal composition according to claim 2, wherein the compound of the formula II is selected from one or more of the following compounds: :as well as Wherein R ₂ represents H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group or an alkene having 2 to 5 carbon atoms; One of a base or an alkenyloxy group. The positive dielectric anisotropic liquid crystal composition according to claim 2, wherein the compound of the formula III is selected from one or more of the following compounds: ;as well as Wherein R ₃ and R _{4 are the} same or different and each independently represents H, an alkyl group or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group; Or one of an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms. The positive dielectric anisotropic liquid crystal composition according to claim 2, wherein 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 H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group; Or one of an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms. The positive dielectric anisotropic liquid crystal composition according to claim 2, wherein the compound of the formula V is selected from one or more of the following compounds: ;as well as Wherein R ₇ and R _{8 are the} same or different and each independently represents H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group; Or one of an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms. The positive dielectric anisotropic liquid crystal composition according to claim 2, wherein the compound of the formula VI is selected from one or more of the following compounds: ;as well as Wherein R ₉ and R _{10 are the} same or different and each independently represents H, an alkyl or alkoxy group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms or a fluoroalkoxy group; Or one of an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms. The positive dielectric anisotropic liquid crystal composition according to any one of claims 1 to 8, wherein the compound of the formula I is selected from one or more of the following compounds: ;as well as And the compound of formula II is selected from one or more of the following compounds: ;as well as And the compound of formula III is selected from one or more of the following compounds: ;as well as And the compound of the formula IV is selected from one or more of the following compounds: ;as well as And the compound of the formula V is selected from one or more of the following compounds: ;as well as And the compound of the formula VI is selected from one or more of the following compounds: ;as well as The positive dielectric anisotropic liquid crystal composition of claim 9, wherein The positive dielectric anisotropy liquid crystal composition comprises: 5% of the total weight of the liquid crystal composition of the compound III-6-2; 2% by weight of the total weight of the liquid crystal composition of the compound II-9-2; 4% of the total weight of the compound II-2-2; 10% by weight of the total weight of the liquid crystal composition of the compound IV-4-7; 3% of the total weight of the liquid crystal composition of the compound II-1-2; 7% of the total weight of the composition of the compound II-1-3; 5% of the total weight of the liquid crystal composition of the compound III-3-2; 2% of the total weight of the liquid crystal composition of the compound II-3-2; 4% of the total weight of the liquid crystal composition of the compound III-7-1; 11% of the total weight of the liquid crystal composition of the compound III-3-3; 23% of the total weight of the liquid crystal composition of the compound III-1-1; The liquid crystal composition has a total weight of 9% of the compound III-3-4; the compound I-1-3 which accounts for 8% by weight of the total weight of the liquid crystal composition; and the compound I-4-2 which accounts for 7% of the total weight of the liquid crystal composition Or the positive dielectric anisotropic liquid crystal composition comprises: compound III-6-2 which accounts for 4% by weight of the total weight of the liquid crystal composition; and compound II-9-2 which accounts for 2% of the total weight of the liquid crystal composition; Total liquid crystal composition 4% of the compound II-2-2; the compound V-4-5 which accounts for 15% of the total weight of the liquid crystal composition; the compound II-1-2 which accounts for 9% of the total weight of the liquid crystal composition; 7% by weight of compound II-1-3; a compound III-3-2 in an amount of 3% by weight based on the total weight of the liquid crystal composition; a compound II-3-2 in an amount of 5% by weight based on the total weight of the liquid crystal composition; and a compound III-7-1 in an amount of 2% by weight based on the total weight of the liquid crystal composition a compound III-3-3 which is 11% by weight based on the total weight of the liquid crystal composition; a compound III-1-1 which accounts for 18% by weight of the total weight of the liquid crystal composition; and a compound III-3- which accounts for 9% by weight of the total weight of the liquid crystal composition 4; the compound I-1-3 which accounts for 6% by weight of the total weight of the liquid crystal composition; and the compound I-4-2 which accounts for 5% by weight of the total weight of the liquid crystal composition, or the liquid crystal composition containing the positive dielectric anisotropy : compound III-5-2 which accounts for 4% by weight of the total weight of the liquid crystal composition; compound III-6-2 which accounts for 4% of the total weight of the liquid crystal composition; and compound II-9- which accounts for 2% of the total weight of the liquid crystal composition 2; a compound II-2-2 which accounts for 2% by weight of the total weight of the liquid crystal composition; a compound II-1-2 which accounts for 8.5% of the total weight of the liquid crystal composition; and a compound II-1 which accounts for 8% by weight of the total weight of the liquid crystal composition -3; compound III-3-2 in an amount of 4% by weight based on the total weight of the liquid crystal composition; compound II-3-2 in an amount of 5% by weight based on the total weight of the liquid crystal composition; and compound VI- in an amount of 10% by weight based on the total weight of the liquid crystal composition 5-3; accounting for the liquid crystal combination a compound III-3-3 having a total weight of 7%; a compound III-1-1 which accounts for 24.5% of the total weight of the liquid crystal composition; and a compound III-3-4 which accounts for 10% by weight of the total weight of the liquid crystal composition; 9% of the total weight of the composition of compound I-1-3; The compound I-4-2 which accounts for 2% by weight of the total weight of the liquid crystal composition, or the positive dielectric anisotropy liquid crystal composition comprises: Compound IV-4-7 which accounts for 10% by weight of the total weight of the liquid crystal composition; 5% of the total weight of the liquid crystal composition of the compound IV-4-2; 3% of the total weight of the liquid crystal composition of the compound II-1-2; 2% of the total weight of the liquid crystal composition of the compound II-5-2; The liquid crystal composition has a total weight of 6% of the compound II-11-1; 3% of the total weight of the liquid crystal composition of the compound II-11-2; 6% of the total weight of the liquid crystal composition of the compound II-3-1; a compound II-3-2 which accounts for 7% by weight of the total weight of the liquid crystal composition; a compound III-3-3 which accounts for 4.5% by weight of the total weight of the liquid crystal composition; and a compound III-1-1 which accounts for 24.5% of the total weight of the liquid crystal composition a compound III-1-2 which accounts for 5% by weight of the total weight of the liquid crystal composition; a compound I-1-3 which accounts for 8% by weight of the total weight of the liquid crystal composition; and a compound I-4- which accounts for 8% by weight of the total weight of the liquid crystal composition 2; and the compound I-4-3, which accounts for 8% by weight of the total weight of the liquid crystal composition, or the positive dielectric anisotropy liquid crystal composition comprises: compound V-4-5 which is 10% by weight based on the total weight of the liquid crystal composition Account for the liquid crystal group 5% by weight of the compound V-4-6; 9% of the total weight of the liquid crystal composition of the compound II-1-2; 7.5% of the total weight of the liquid crystal composition of the compound II-1-3; 4% of the total weight of the compound II-1-5; a compound II-5-2 which is 2% by weight based on the total weight of the liquid crystal composition; a compound II-5-1 which accounts for 2% by weight of the total weight of the liquid crystal composition; and a compound II-11-1 which accounts for 6% by weight of the total weight of the liquid crystal composition a compound II-11-2 which is 4% by weight based on the total weight of the liquid crystal composition; a compound II-3-2 which is 10% by weight based on the total weight of the liquid crystal composition; and a compound III-3- which accounts for 2% by weight of the total weight of the liquid crystal composition 3; compound III-1-1 which accounts for 20.5% of the total weight of the liquid crystal composition; compound III-1-2 which accounts for 3% of the total weight of the liquid crystal composition; and compound I-1 which accounts for 8% of the total weight of the liquid crystal composition -3; Compound I-4-2 in an amount of 3% by weight based on the total weight of the liquid crystal composition; and Compound I-4-3 in an amount of 4% by weight based on the total weight of the liquid crystal composition.