CN103937508B - A liquid crystal composition with stable threshold voltage and its application - Google Patents

Abstract

The present invention relates to a liquid crystal composition with stable threshold voltage, comprising the following components: (1) 5%-40% of the compound represented by the general formula I; (2) 10%-40% of the compound represented by the general formula II Compound; the present invention utilizes bisoxyheterocyclic compound as the polar component of the liquid crystal composition, overcomes the shortcoming that the photoelectric characteristics of the liquid crystal composition change with frequency, and has a class I compound with a difluoromethoxy structure and a compound with 3, The polar components of the combination of type II compounds with 4,5-trifluorobenzene structure jointly adjust the voltage-temperature stability of the liquid crystal composition, so that the voltage characteristics do not change with temperature, thereby improving the display effect.

Description

A liquid crystal composition with stable threshold voltage and its application

technical field

The invention relates to a liquid crystal composition with stable threshold voltage and an application thereof, belonging to the technical field of liquid crystal display.

Background technique

At present, liquid crystals are widely used in the field of information display, and at the same time, some progress has been made in the application of optical communication (S.T.Wu, D.K.Yang. Reflective Liquid Crystal Displays. Wiley, 2001). In recent years, the application fields of liquid crystal compounds have been significantly expanded to various display devices, electro-optic devices, electronic components, sensors, etc. For this reason, many different structures have been proposed, especially in the field of nematic liquid crystals, and nematic liquid crystal compounds have been most widely used in flat panel displays so far. Especially for TFT active matrix systems.

Liquid crystal display has experienced a long development path with the discovery of liquid crystal. In 1888, Austrian botanist Friedrich Reinitzer discovered the first liquid crystal material, cholesterol benzoate. In 1917, Manguin invented the rubbing orientation method to make monodomain liquid crystals and study optical anisotropy. In 1909, E.Bose established the theory of Swarm, which was supported by the experiments of L.S.Ormstein and F.Zernike (1918), and was later discussed as statistical fluctuations by De Gennes. G.W.Oseen and H.Zocher founded the continuum theory in 1933, and it was perfected by F.C.Frank (1958). M.Born (1916) and K.Lichtennecker (1926) discovered and studied the dielectric anisotropy of liquid crystals. In 1932, W.Kast divided the nematic phase into two categories, positive and negative. In 1927, V.Freedericksz and V.Zolinao discovered that the nematic liquid crystal was deformed and had a voltage threshold (Freederichsz transition) under the action of an electric field (or magnetic field). This finding provides a basis for the production of liquid crystal displays.

In 1968, R.Williams of RCA Company in the United States discovered that the nematic liquid crystal forms stripe domains under the action of an electric field, and has light scattering phenomenon. G.H.Heilmeir then developed it into a dynamic scattering display mode and made it the world's first liquid crystal display (LCD). In the early 1970s, Helfrich and Schadt invented the TN principle. People combined the TN photoelectric effect with integrated circuits to make it into a display device (TN-LCD), which opened up broad prospects for the application of liquid crystals. Since the 1970s, due to the development of large-scale integrated circuits and liquid crystal materials, the application of liquid crystals in display has achieved breakthrough development. From 1983 to 1985, T. Scheffer and others successively proposed super twisted nematic phase (Super Twisred Nematic: STN) mode and the active matrix (Active matrix: AM) method proposed by P.Brody in 1972 were re-adopted. The traditional TN-LCD technology has been developed into STN-LCD and TFT-LCD technology. Although the number of scanning lines of STN can reach more than 768 lines, there are still problems such as response speed, viewing angle and gray scale when the temperature rises. Therefore, Most of the large-area, high-information, and color displays use active matrix display. TFT-LCD has been widely used in direct-view TV, large-screen projection TV, computer terminal display and some military instrument display. It is believed that TFT-LCD technology has a broader application prospect.

The "active matrix" includes two types: 1. OMS (Metal Oxide Semiconductor) or other diodes on a silicon wafer as a substrate. 2. A thin film transistor (TFT) on a glass plate as a substrate.

Monocrystalline silicon as a substrate material limits the size of the display, because there are many problems in the combination of various display devices and even module assembly. Thus, the second thin-film transistor is a promising active-matrix type, where the photoelectric effect used is usually the TN effect. TFTs include compound semiconductors, such as Cdse, or TFTs based on polycrystalline or amorphous silicon. TN-TFT products have been widely used due to mature technology, but there are problems such as viewing angle and contrast. In order to improve the viewing angle and contrast, a new optical mode in-plane switching mode (IPS) and fringe field effect mode (FFS) are proposed. Contrast and viewing angle issues were successfully resolved.

At present, LCD product technology has matured, successfully solved technical problems such as viewing angle, resolution, color saturation and brightness, and its display performance has approached or exceeded that of CRT displays. Large-size and small and medium-sized LCDs have gradually occupied the mainstream position of flat panel displays in their respective fields. The liquid crystal display is limited by the temperature range of the liquid crystal. As the temperature changes, the photoelectric characteristics of the liquid crystal will change accordingly, resulting in a sharp drop in the display effect caused by the temperature change. At the same time, with the change of the driving voltage frequency, the photoelectric characteristics of the liquid crystal will also change. will change, so the display effect will also degrade.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a liquid crystal composition, which has the characteristics of small change in photoelectric properties with temperature and good frequency stability.

In order to achieve the above object, the present invention adopts the following technical solutions:

A liquid crystal composition with stable threshold voltage, comprising the following components:

(1) 5%-40% of the compound represented by general formula I;

(2) 10%-40% of the compound represented by the general formula II;

Wherein, the structures of the compounds represented by the general formulas I and II are as follows:

Wherein, R ₁ and R ₂ independently represent a C ₁ -C ₁₂ alkyl group; X represents F, OCF ₃ , CF ₃ , OCF=CF ₂ , OCF ₂ —CF=CF ₂ or OCF=CF—CF ₃ ; A , D independently represent:

B and C independently represent:

m, n, p represent 0 or 1 oppositely, and 1≤m+n+p≤2.

Preferably, the general formula I is preferably a compound represented by formula I-A to formula I-G:

Wherein, X each independently represents F, CF ₃ , OCF ₃ , OCF ₂ -CF=CF ₂ , and OCF=CF-CF ₃ .

More preferably, general formula I is selected from formula I-A1 to formula I-A5, formula I-B1 to formula I-B5, formula I-C1 to formula I-C5, formula I-D1 to formula I-D5, formula Compounds represented by formulas I-E1 to I-E5, formulas I-F1 to I-F5, and formulas I-G1 to I-G5.

Wherein, R ₁ represents a C ₁ -C ₇ alkyl group, more preferably a C ₂ -C ₅ alkyl group;

Preferably, the general formula II preferably has the following structure:

Wherein, R ₂ represents a C ₁ -C ₇ alkyl group, more preferably a C ₂ -C ₅ alkyl group.

In order to realize the remaining properties of the liquid crystal composition, optical anisotropy, electrical anisotropy, liquid crystal phase temperature range, etc., the present invention also includes the following components:

(1) 10%-70% of the compound represented by the general formula III;

(2) 0%-30% of the compound represented by the general formula IV;

(3) 0%-20% of the compound represented by the general formula V;

(4) 0%-20% of the compound represented by the general formula VI.

Wherein, the structures of the compounds represented by the general formulas III, IV and V are as follows:

Wherein, R ₃ represents a C ₁ -C ₁₂ alkyl group, and one or more non-adjacent CH ₂ can be replaced by O or CH=CH;

R ₄ and R ₅ each independently represent a C ₁ -C ₁₂ alkyl group;

R ₆ , R ₇ , and R ₈ each independently represent a C ₁ -C ₁₂ alkyl group or a C ₂ -C ₁₂ alkenyl group;

L ₁ -L ₅ each independently represent H or F;

Y and Z independently represent F or OCF ₃ ;

q and r each independently represent 0 or 1;

G and E each independently represent 1,4-cyclohexane or 1,4-phenylene.

Preferably, the general formula III preferably has the following structure:

Wherein, R ₄ represents a C ₁ -C ₅ alkyl group;

In formula III-A, R ₃ represents C ₂ -C ₅ alkenyl;

In formula III-B, R ₃ represents a C ₂ -C ₅ alkyl group;

In formula III-C, R ₃ represents C ₁ -C ₅ alkoxy or CH ₂ OCH ₃ ;

In formula III-D, R ₃ represents C ₁ -C ₅ alkyl, C ₂ -C ₅ alkenyl;

Preferably, the general formula IV preferably has the following structure:

Wherein, R ₅ represents a C ₂ -C ₅ alkyl group.

Preferably, the general formula V preferably has the following structure:

Among them, in formula VA and formula VB, R ₆ and R ₇ each independently represent a C ₂ -C ₅ alkyl group; in formula VC and formula VD, R ₆ and R ₇ each independently represent a C ₁ -C ₅ alkane group or C ₂ -C ₅ alkenyl.

Preferably, the general formula VI preferably has the following structure:

Wherein, R ₈ represents a C ₁ -C ₇ alkyl group, more preferably a C ₂ -C ₅ alkyl group.

Preferably, the liquid crystal composition provided by the present invention comprises the following components by weight percentage:

1), 5%-35% of one or more compounds represented by general formula I;

2), 10%-40% of one or more compounds represented by general formula II;

3), 10%-70% of one or more compounds represented by general formula III;

4), 5%-30% of one or more compounds represented by general formula IV and/or V;

5), 0%-20% of one or more compounds represented by general formula VI.

Wherein, the sum of the above 1) to 5) is equal to 100%.

More preferably, the liquid crystal composition provided by the invention comprises the following components by weight percentage:

1), 10%-25% of one or more compounds represented by general formula I;

2), 10%-30% of one or more compounds represented by general formula II;

3), 20%-50% of one or more compounds represented by general formula III;

4), 5%-30% of one or more compounds represented by general formula IV and/or V;

5), 0%-20% of one or more compounds represented by general formula VI.

Wherein, the sum of the above 1) to 5) is equal to 100%.

More preferably, the mass ratio of the compound represented by the general formula I to the compound represented by the general formula II is (0.5-2):1.

The present invention also provides the application of the above-mentioned liquid crystal composition in liquid crystal display devices, especially suitable for displays with configurations such as TN, IPS, and FFS.

In addition, the liquid crystal composition provided by the present invention has good thermal stability and light stability, and is especially suitable for TFT display mode.

Among the components of the liquid crystal composition of the present invention, the compound containing a dioxane ring and a difluoromethoxy bridge structure represented by general formula I has strong dielectric anisotropy. The inductive effect of oxygen atoms enhances its polarization, and the liquid crystal compound with dioxo heterocyclic structure has good frequency dependence, and its voltage characteristics change little with frequency, while the compound with difluoromethoxy bridge structure shows The change of the voltage characteristic with temperature is negative, that is, the threshold voltage decreases as the temperature decreases.

The compound containing 3,4,5-trifluorobenzene structure represented by the general formula II has a certain polarity, and the voltage characteristic of the compound described in the structure is positive (increasing as the temperature decreases) in the liquid crystal composition, Its compound containing bis-oxo heterocyclic structure also has good frequency stability.

The bicyclic compound represented by general formula III is a non-polar component, which was previously disclosed in US Pat. No. 4,565,425. This type of compound has a significant effect on reducing the viscosity of the system and increasing the response speed, and is an essential class of compound for preparing a liquid crystal mixture with a fast response.

The tetracyclic compound provided by the general formula IV has a high clearing point and is mainly used to adjust properties such as the clearing point of the composition.

The structure in the general formula V has a high clearing point and large optical anisotropy, and adding it to the mixed liquid crystal mainly improves the optical anisotropy and clearing point performance.

The present invention utilizes bis-oxo-heterocyclic structural compound as the polar component of the liquid crystal composition, overcomes the shortcoming that the photoelectric properties of the liquid crystal composition change with frequency, and uses the I-type compound with a difluoromethoxy structure and a compound with 3, 4, The polar components of the combination of II compounds with 5-trifluorobenzene structure jointly adjust the voltage and temperature stability of the liquid crystal composition, so that the voltage characteristics do not change with temperature, thereby improving the display effect; in addition, the liquid crystal composition also includes IV with high-definition bright spots. Type V, type V and type V compounds with large optical anisotropy, and type III compounds that can reduce the viscosity characteristics of the system and improve the response time of liquid crystal displays.

The preparation method of the liquid crystal composition of the present invention is not particularly limited, and two or more compounds can be mixed by conventional methods, such as by mixing different components at high temperature and dissolving each other. Wherein, the liquid crystal composition is dissolved in the solvent used for the compound and mixed, and then the solvent is distilled off under reduced pressure; or the liquid crystal composition of the present invention can be prepared according to a conventional method, such as adding a small amount of It is obtained by dissolving the components in the main component with a relatively large content at a higher temperature, or dissolving each component in an organic solvent, such as acetone, chloroform or methanol, and then mixing the solutions to remove the solvent.

The liquid crystal composition of the present invention has good temperature stability and frequency stability, can effectively solve the above-mentioned problems, and realize excellent display effects; in addition, the liquid crystal composition of the present invention also has low viscosity, High resistivity, good low temperature miscibility and fast response speed, can be used for fast response liquid crystal display of various display modes, the liquid crystal composition of the present invention overcomes these problems, has low viscosity and good low temperature performance and excellent Frequency dependence, its use in TN, IPS or FFS mode displays can significantly improve the display effect of liquid crystal displays.

Description of drawings

Fig. 1 is the schematic diagram of the change law of the threshold voltage with the frequency of embodiment 1 and comparative example 1;

FIG. 2 is a schematic diagram of the change law of the threshold voltage with temperature in Example 1 and Comparative Examples 2 and 3. FIG.

Detailed ways

The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

The preparation of liquid crystal composition in the embodiment of the present invention all adopts following method:

The preparation of uniform liquid crystal adopts the thermal dissolution method commonly used in the industry. First, the liquid crystal compound is weighed by weight percentage with a balance. There is no specific requirement for the order of weighing and adding. Usually, the liquid crystal compound is weighed and mixed in order of melting point from high to low. Heat and stir at 60-100°C to make each component melt evenly, then filter, spin evaporate, and finally package to obtain the target sample.

Unless otherwise stated, percentages in this context are by weight and all temperatures are given in degrees Celsius. Use the following abbreviations:

Δn is the optical anisotropy (20°C), Δε is the dielectric constant anisotropy (25°C, 1000Hz), V ₁₀ is the threshold voltage, which is the characteristic voltage when the relative transmittance changes by 10% (V, 25 °C), η is the bulk viscosity (mm ² /s, 20 °C), and Cp is the clearing point (°C) of the liquid crystal composition.

For ease of expression, in the following examples, the group structure in the liquid crystal compound is represented by the code shown in Table 0:

Table 0: Group Structure Codes of Liquid Crystal Compounds:

Take the following structure as an example:

The structure is represented by the code listed in Table 0, and it is represented as 4CDUQUY

Another example is the following structure:

The structure is represented by the code listed in Table 0, and it is expressed as 5CCPUF.

Example 1

Take the liquid crystal compound in the following weight percentages and prepare the liquid crystal composition by the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 1:

The weight percent and performance parameter of each component in the liquid crystal composition of table 1 embodiment 1

category components weight percentage (%) performance parameter parameter value

I 3DUQUF 15 Δn 0.100 II 3DPUF 10 Δε +6.4 III VCCP1 13 V10 1.35 III V2CCP1 12 n 12 III 3CCV 36 Cp 92 IV 2CCPUF 4 IV 3CCPUF 4 V 5CPGP3 6

Example 2

Take the liquid crystal compound in the following weight percentages and prepare the liquid crystal composition by the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 2:

The weight percent and performance parameter of each component in the liquid crystal composition of table 2 embodiment 2

category components weight percentage (%) Performance parameter parameter value I 3DUQUF 15 Δn 0.120 I 2DPUQUF 10 Δε +13.0 I 3CDUQUF 10 V10 0.85 II 3DPUF 15 n 25 II 2CCUF 10 Cp 80 II 3CCUF 10 II 3DCUF 5 III 3CCV 10 IV 2CCPUF 5 IV 3CCPUF 5 IV 4CCPUF 5

Example 3

Take the liquid crystal compound in the following weight percentages and prepare the liquid crystal composition by the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 3:

The weight percent and performance parameter of each component in the liquid crystal composition of table 3 embodiment 3

category components weight percentage (%) performance parameter parameter value

I 3DUQUF 5 Δn 0.100 II 3DPUF 10 Δε +3.0 III 3CCV 40 V10 1.80 III 5CCV 10 n 9 III VCCP1 10 Cp 77 III V2CCP1 10 V 2PGP3 10 V 5CPGP2 5

Example 4

Take the liquid crystal compound in the following weight percentages and prepare the liquid crystal composition by the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 4:

The weight percent and performance parameter of each component in the liquid crystal composition of table 4 embodiment 4

category components weight percentage (%) performance parameters parameter value I 3DCQUX 19 Δn 0.098 II 2CCUF 8 Δε +9.4 II 3CCUF 8 V10 1.15 II 3CPUF twenty three n twenty four III 5CCV 13 Cp 101 III 3CCV1 4 IV 2CCPUF 4 IV 3CCPUF 4 IV 4CCPUF 4 IV 5CCPUF 4 VI 2CCGF 3 VI 3CCGF 3 VI 5CCGF 3

Example 5

Take the liquid crystal compound in the following weight percentages and prepare a liquid crystal composition by the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 5:

The weight percent and performance parameter of each component in the liquid crystal composition of table 5 embodiment 5

category components weight percentage (%) performance parameter parameter value I 3DUQUF 8 Δn 0.100 II 3CCUF 4 Δε +6.5 II 3CPUF 9 V ₁₀ 1.45 II 3CGUF 7 n 14 II 2PGUF 3 Cp 90 III 3CCV 27 III 3CCV1 5 III VCCP1 13 III V2CCP1 11 IV 3CCGUF 7 VI VCCGF 6

Example 6

Take the liquid crystal compound in the following weight percentages and prepare a liquid crystal composition according to the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 6:

The weight percent and performance parameter of each component in the liquid crystal composition of table 6 embodiment 6

category components weight percentage (%) performance parameters parameter value I 3DCQUF 13 Δn 0.090 I 3DUQUF 12 Δε +12.0 I 3DPUQUF 14 V ₁₀ 1.02 II 2CCUF 5 n 17 II 3CCUF 10 Cp 90 III 3CCV twenty four III VCCP1 9 VI 3CCPOCF ₃ 5 IV 2CCPUF 4 IV 3CCPUF 4

Example 7

Take the liquid crystal compound in the following weight percentages and prepare a liquid crystal composition according to the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 7:

The weight percent and performance parameter of each component in the liquid crystal composition of table 7 embodiment 7

category components weight percentage (%) performance parameters parameter value I 3DPUQUF 10 Δn 0.100 I 3DUQUF 12 Δε +7.5 II 3CCUF 10 V ₁₀ 1.28 III 3CCV 45 n 12 IV 2CCPUF 3 Cp 75 IV 3CCPUF 3 IV 4CCPUF 3 V 2PGP3 10 V 2PGP5 4

Example 8

Take the liquid crystal compound in the following weight percentages and prepare a liquid crystal composition according to the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 8:

The weight percent and performance parameter of each component in the liquid crystal composition of table 8 embodiment 8

category components weight percentage (%) performance parameter parameter value I 3DUQUF 13 Δn 0.092 II 2CCUF 10 Δε +10.0 II 3CCUF 10 V ₁₀ 1.10 II 4CCUF 10 n twenty two II 5CCUF 4 Cp 100 III 4CCV 13 III VCCP1 4 III V2CCP1 13 IV 2CCPUF 4 IV 3CCPUF 4 V 3CPPC3 4

V 3CGPC3 3 VI VCCGF 8

Comparative example 1

A liquid crystal composition was obtained as Comparative Example 1 by taking the following weight percentages of liquid crystal compounds and preparing a liquid crystal composition according to the method described in the present invention. The performance parameters of the specific proportioning and the obtained liquid crystal composition are shown in Table 9:

The weight percent and performance parameters of each component in the liquid crystal composition of Table 9 Comparative Example 1

category components weight percentage (%) performance parameter parameter value 3PUQUF 15 Δn 0.100 3CPUF 10 Δε +6.4 III VCCP1 13 V10 1.35 III V2CCP1 12 n 12 III 3CCV 36 Cp 92 IV 2CCPUF 5 IV 3CCPUF 5 IV 4CCPUF 4

Comparing the variation law of the threshold voltage of Example 1 and Comparative Example 1 with frequency, the specific results are shown in Fig. 1: as can be seen from Fig. 1, the liquid crystal composition of the present invention has good voltage-frequency dependence, thus the provided The liquid crystal composition can have better display effect in practical application. According to the same detection method, Examples 2-8 also have good voltage and frequency stability.

Comparative example 2

Take the liquid crystal compound in the following weight percentages and prepare a liquid crystal composition according to the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 10:

The weight percent and performance parameters of each component in the liquid crystal composition of Table 10 Comparative Example 2

Comparative example 3

Take the liquid crystal compound in the following weight percentages and prepare a liquid crystal composition according to the method described in the present invention. The specific proportion and the performance parameters of the obtained liquid crystal composition are shown in Table 11:

Table 11 The weight percent and performance parameters of each component in the liquid crystal composition of Comparative Example 3

Comparing the variation law of the threshold voltage of Example 1 and Comparative Example 2 and Comparative Example 3 with temperature, the detailed results are shown in Figure 2: as can be seen from Figure 2, the liquid crystal composition of the present invention has good voltage-temperature dependence, The liquid crystal composition thus provided can have better display effects in practical applications, and is particularly important in liquid crystal displays that require a wide operating temperature range.

The liquid crystal composition containing dioxygen heterocyclic compound and 3,4,5-trifluorobenzene provided by the present invention has good voltage frequency dependence and temperature stability. In addition, the liquid crystal composition provided by the present invention also has low Excellent viscosity, high resistivity, suitable optical anisotropy, greater dielectric anisotropy, and excellent light stability and thermal stability can solve the problem of liquid crystal display response speed, especially low temperature response speed , suitable for fast-response liquid crystal display devices, especially suitable for wide temperature liquid crystal displays, which can effectively solve the shortcoming of poor high and low temperature display of liquid crystal displays.

Although, the present invention has been described in detail with general description, specific implementation and test above, but on the basis of the present invention, some modifications or improvements can be made to it, which will be obvious to those skilled in the art . Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (8)

1. a liquid-crystal composition for threshold voltage stabilization, is characterized in that, is made up of following component:

1), the compound representated by one or more general formula Is of 5%-35%;

2), the compound representated by one or more general formula Is I of 10%-40%;

3), the compound representated by one or more general formula III of 10%-70%;

4), the compound representated by one or more general formula Is V and/or V of 5%-30%;

5), the compound representated by one or more general formulas VI of 0%-20%;

Wherein, above-mentioned 1) to 5) sum equals 100%;

Wherein, the compound structure representated by described formula I, II is as follows:

Wherein, R ₁, R ₂represent C independently of one another ₁-C ₁₂alkyl; X represents F, OCF ₃, CF ₃, OCF=CF ₂or OCF=CF-CF ₃; A, D represent independently of one another:

B, C represent independently of one another:

M, n, p contrario represent 0 or 1 separately, and 1≤m+n+p≤2;

Compound structure representated by described general formula III, IV, V, VI is as follows:

Wherein, R ₃represent C ₁-C ₁₂alkyl, one or more non-conterminous CH ₂can be substituted by O or CH=CH;

R ₄and R ₅represent C independently of one another ₁-C ₁₂alkyl;

R ₆, R ₇, R ₈represent C independently of one another ₁-C ₁₂alkyl or C ₂-C ₁₂thiazolinyl;

L ₁-L ₅represent H or F independently of one another;

Y, Z represent F or OCF independently of one another ₃;

Q and r represents 0 or 1 independently of one another;

G and E represents Isosorbide-5-Nitrae-hexanaphthene or Isosorbide-5-Nitrae-phenylene independently of one another.

2. the liquid-crystal composition of threshold voltage stabilization according to claim 1, is characterized in that, described general formula I is selected from the compound representated by formula I-A to formula I-G:

Wherein, X represents F, CF independently of one another ₃, OCF ₃, and OCF=CF-CF ₃.

3. the liquid-crystal composition of threshold voltage stabilization according to claim 1, is characterized in that, described general formula I is selected from following compound:

Wherein, R ₁represent C ₁-C ₇alkyl.

4. the liquid-crystal composition of threshold voltage stabilization according to claim 1, is characterized in that, described general formula I I is selected from following structure:

Wherein, R ₂represent C ₁-C ₇alkyl.

5. the liquid-crystal composition of threshold voltage stabilization according to claim 1, is characterized in that, described general formula III is selected from following structure:

Wherein, R ₄represent C ₁-C ₅alkyl;

In formula III-A, R ₃represent C ₂-C ₅thiazolinyl;

In formula III-B, R ₃represent C ₂-C ₅alkyl;

In formula III-C, R ₃represent C ₁-C ₅alkoxyl group or CH ₂oCH ₃;

In formula III-D, R ₃represent C ₁-C ₅alkyl, C ₂-C ₅thiazolinyl;

Described general formula I V is selected from following structure:

Wherein, R ₅represent C ₂-C ₅alkyl;

Described general formula V is selected from following structure:

Wherein, in formula V-A and formula V-B, R ₆, R ₇represent C independently of one another ₂-C ₅alkyl; In formula V-C and formula V-D, R ₆, R ₇represent C independently of one another ₁-C ₅alkyl or C ₂-C ₅thiazolinyl;

Described general formula VI is selected from following structure:

Wherein, R ₈represent C ₁-C ₇alkyl.

6. the liquid-crystal composition of threshold voltage stabilization according to claim 1, is characterized in that, comprises the component of following weight percent:

1), the compound representated by one or more general formula Is of 10%-25%;

2), the compound representated by one or more general formula Is I of 10%-30%;

3), the compound representated by one or more general formula III of 20%-50%;

4), the compound representated by one or more general formula Is V and/or V of 5%-30%;

5), the compound representated by one or more general formulas VI of 0%-20%;

Wherein, above-mentioned 1) to 5) sum equals 100%.

7. the application of the arbitrary described liquid-crystal composition of claim 1-6 in liquid crystal indicator.

8. application according to claim 7, is characterized in that, described liquid crystal indicator is the indicating meter of the configurations such as TN, IPS, FFS.