TWI892265B - Liquid crystal composition, liquid crystal display element, and liquid crystal display - Google Patents

Abstract

The present invention discloses a liquid crystal composition comprising one or more compounds of formula I, and further comprising an additive of a compound of formula TJ1 and a compound of formula TJ2. I TJ1 TJ2 The present invention provides a liquid crystal composition having a low rotational viscosity and a large elastic constant while maintaining suitable dielectric anisotropy and optical anisotropy. In particular, it has a fast low-temperature response speed and good backlight aging performance. It can be used to develop liquid crystal display devices or liquid crystal displays with a fast response speed, a wide display temperature range, and the ability to effectively improve image retention.

Description

Liquid crystal composition, liquid crystal display element, and liquid crystal display

The present invention relates to the field of liquid crystal display technology, and specifically includes a liquid crystal composition and its liquid crystal display element or display.

Liquid crystal materials are mixtures of small, rod-shaped organic compounds that exhibit both the fluidity of a liquid and the anisotropy of a crystal at a certain temperature. Due to their optical and dielectric anisotropy, liquid crystal materials are widely used in display devices such as calculators, laptops, car meters, and televisions. With the advancement of display technology, flat-panel displays such as liquid crystal displays (LCDs) have become mainstream due to their high image quality, power efficiency, thin design, and wide range of applications, ultimately replacing cathode ray tube displays.

Liquid crystal displays are classified according to their display mode into TN (twist nematic), STN (super twisted nematic), IPS (in-plane switching), and VA (vertical alignment).

With the rapid advancement of science and technology, liquid crystals are being applied to displays in an increasingly widespread manner, primarily in mobile phones, computers, televisions, automotive displays, outdoor displays, medical devices, and other display-related devices. As demand for display technology continues to rise, the display industry is also advancing, and the application and demand for liquid crystal display components are increasing. People are pursuing LCDs with smoother, clearer displays, and more vivid and saturated images.

Regarding the response speed of LCDs, based on an analysis of their principles and characteristics, the following factors generally influence their response speed: 1. The viscosity of the liquid crystal material, which is determined by the material's inherent properties; 2. The size of the liquid crystal cell gap, i.e., the gap between the upper and lower conductive glass substrates, and therefore the thickness of the liquid crystal layer; 3. The dielectric constant of the liquid crystal material, which is determined by the material's inherent properties; and 4. The drive voltage. The higher the drive voltage, the faster the response speed.

The viscosity and dielectric constant of liquid crystal materials are directly related to the properties of the liquid crystal material itself. Increasing the driving voltage of the liquid crystal cell can certainly improve the response speed, but it also reduces the lifespan of the liquid crystal. By improving the process, the gap between the liquid crystal cells can be reduced, allowing the liquid crystal molecules to twist into position more quickly. Of course, these properties are relative at room temperature. Because the liquid crystal materials used in actual use are composed of various types of polymer organic substances, they maintain the common properties of liquids and solids within a certain temperature range. When the temperature changes, the activity energy of the liquid crystal molecules changes, and the viscosity of the liquid crystal material changes accordingly. When the temperature is high, the activity energy of the liquid crystal molecules is high and the viscosity is low. When driven by an electric field, the liquid crystal can freely and rapidly twist and align in the direction of the electric field, resulting in a faster response speed for the display. Similarly, at low temperatures, the activity energy of the liquid crystal molecules is weakened, and the viscosity increases. When an electric field is applied to the liquid crystal molecules, the liquid crystal molecules experience greater viscosity resistance, causing the liquid crystal to twist and align in the direction of the electric field. This slows the response speed of the display, and if the speed is too slow, it will cause smearing.

In addition, consumers may be more sensitive to the phenomenon of ghosting (or ghosting) on LCD monitors, as some mobile phones will exhibit very obvious ghosting in the winter. In fact, "ghosting" is a natural property of the screen. The biggest cause of ghosting is the long response time of the LCD. The core of LCD screen display is "the change in the arrangement direction of liquid crystal molecules," that is, the activity of liquid crystal molecules. Therefore, as long as there are factors in the environment that can affect the activity of liquid crystal molecules, the pixel quality of the LCD screen can be changed. Liquid crystal materials are very sensitive to the ambient temperature. The lower the temperature, the slower the liquid crystal molecules flip, which means that the screen response time becomes longer. In low temperature environments, the brightness is reduced, and the response time is greatly reduced. In addition to the smearing phenomenon seen on small and medium-sized displays such as mobile phones and tablets, the long response time of large-size LCDs for desktop applications is also a common drawback. CN114854428A discloses a liquid crystal compound of Formula I, which has a high clearing point and good low-temperature stability:

However, the cyclohexenyl group in the compound represented by Formula I results in poor stability of the liquid crystal compound under ultraviolet and high-temperature conditions. This is particularly true after prolonged backlight aging, resulting in poor reliability and prone to image artifacts or smearing in LCDs. Furthermore, when used in high-temperature and high-humidity environments, the poor stability of the liquid crystal compound can lead to poor display quality in LCDs.

Therefore, in addition to possessing appropriate dielectric anisotropy, optical anisotropy, elastic constant, appropriate upper and lower nematic phase temperatures, and low rotational viscosity, liquid crystal compositions must also be resistant to UV radiation, high temperatures, and high humidity. When used or stored for extended periods in high temperature or high humidity environments, the liquid crystal composition must remain stable and prevent display defects due to decomposition of the liquid crystal components.

In light of this, the present invention provides a liquid crystal composition that, while maintaining suitable dielectric anisotropy and optical anisotropy, exhibits low rotational viscosity, a large elastic constant, and, in particular, rapid low-temperature response and good backlight aging performance. This composition can be used to develop liquid crystal display devices or liquid crystal displays with rapid response, a wide display temperature range, and effective improvement in image retention.

To achieve the above-mentioned purpose, this invention adopts the following technical solutions:

The first aspect of the present invention provides a liquid crystal composition. Preferably, the liquid crystal composition comprises one or more compounds of formula I, and further comprises an additive of a compound of formula TJ1 and a compound of formula TJ2.

wherein _R1 represents a chain alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms; _R2 represents a chain alkyl group having 1 to 15 carbon atoms; R represents a chain alkyl group having 1 to 10 carbon atoms; and _R0 represents a chain alkyl group having 1 to 5 carbon atoms; and based on 100% total mass content of the liquid crystal composition, the mass addition amount of the compound represented by TJ1 is 0.002-0.01%, and the mass addition amount of the compound represented by TJ2 is 0.02-0.1%.

The second aspect of the present invention provides a liquid crystal display element or liquid crystal display, which comprises the aforementioned liquid crystal compound and liquid crystal composition.

The beneficial effects of the present invention are as follows:

The present invention provides a liquid crystal composition that, while maintaining suitable dielectric anisotropy and optical anisotropy, exhibits low rotational viscosity, a large elastic constant, and particularly fast low-temperature response and good backlight aging performance. This composition can be used to develop liquid crystal display elements or liquid crystal displays with fast response, a wide display temperature range, and effective improvement in image retention.

The first aspect of the present invention provides a liquid crystal composition. Preferably, the liquid crystal composition comprises one or more compounds of formula I, and further comprises an additive of a compound of formula TJ1 and a compound of formula TJ2.

wherein _R1 represents a chain alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms; _R2 represents a chain alkyl group having 1 to 15 carbon atoms; R represents a chain alkyl group having 1 to 10 carbon atoms; and _R0 represents a chain alkyl group having 1 to 5 carbon atoms; and based on 100% total mass content of the liquid crystal composition, the mass addition amount of the compound represented by TJ1 is 0.002-0.01%, and the mass addition amount of the compound represented by TJ2 is 0.02-0.1%.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula I is selected from the group consisting of compounds represented by the following formulae I-1 to I-11,

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula TJ1 is selected from the group consisting of compounds represented by the following formulae TJ1-1 to TJ1-7.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula TJ2 is selected from the group consisting of compounds represented by the following formulae TJ2-1 to TJ2-5.

In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by Formula I in the aforementioned liquid crystal composition is 3-20%, the mass addition amount of the compound represented by TJ1 is 0.002-0.01%, and the mass addition amount of the compound represented by TJ2 is 0.02-0.1%.

In the liquid crystal composition of the present invention, preferably, the ratio of the amount of the compound represented by TJ1 to the amount of the compound represented by TJ2 is between 1:10 and 1:3.

In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by Formula I in the liquid crystal composition is 5-13%. Further preferably, the compound represented by Formula I comprises at least two compounds selected from Formulas I-1 to I-11.

The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula II.

Wherein, R ₃ represents a chain alkyl group having 1 to 15 carbon atoms, and one or more non-adjacent -CH ₂ - groups in R ₃ may be substituted by a cyclopentylene group or a cyclopropylene group; X ₁ represents -H or -CH ₃ .

In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula II is 5-13%.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula II is selected from the group consisting of compounds represented by the following formulae II-1 to II-6.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula II comprises at least two compounds selected from the compounds represented by formulas II-1 to II-6.

The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula III.

Wherein, R ₄ represents a chain alkyl group having 1 to 15 carbon atoms.

In the liquid crystal composition of the present invention, the mass content of the compound represented by the aforementioned formula III is preferably 3-17%.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula III is selected from the group consisting of compounds represented by the following formulae III-1 to III-4.

The liquid crystal composition of the present invention preferably comprises at least two compounds represented by Formula III.

The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula IV.

Wherein, R ₅ and R ₆ each independently represent an alkyl group having 1 to 15 carbon atoms, and any one or more -CH ₂ - in the alkyl group are each independently optionally replaced by -C≡C-, -CH=CH-, or -O- in such a manner that the O atoms are not directly connected to each other.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV is selected from the group consisting of compounds represented by the following formulae IV-1 to IV-21.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV at least comprises the compound represented by formula IV-1.

In the liquid crystal composition of the present invention, the mass content of the compound represented by formula IV-1 is preferably 25-50%; more preferably, the mass content of the compound represented by formula IV-1 is 35-42%.

The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula V.

Here, R ₇ and R ₈ each independently represent a chain alkyl group having 1 to 15 carbon atoms, a chain alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V is selected from the group consisting of compounds represented by the following formulae V-1 to V-6,

The liquid crystal composition of the present invention preferably contains 4-15% of the compound represented by formula V-4.

The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula VI.

wherein R ₉ and R ₁₀ each independently represent a chain alkyl group having 1 to 15 carbon atoms, a chain alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms; express or .

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VI is selected from the group consisting of compounds represented by the following formulae VI-1 to VI-19.

The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula VII.

wherein R ₁₁ represents a chain alkyl group having 1 to 15 carbon atoms, and one or more non-adjacent -CH ₂ - groups in R ₁₁ are optionally substituted by cyclopentylene or cyclopropylene; X ₂ represents -H or -F; and X ₃ represents -H or -CH ₃ .

In the liquid crystal composition of the present invention, the mass content of the compound represented by formula VII is preferably 3-15%; more preferably, the mass content of the compound represented by formula VII is 5-11%.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VII is selected from the group consisting of compounds represented by the following formulae VII-1 to VII-9.

The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula VIII.

wherein R ₁₂ represents an alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms; X ₄ and X ₅ each independently represent -H or -F; and m represents 1, 2 or 3; express 、 、 、 or , and when m represents 2 or 3, two or three Choose the same or different.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VIII is selected from the group consisting of compounds represented by the following formulae VIII-1 to VIII-19.

Here, R ₁₂ represents an alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms.

The liquid crystal composition of the present invention preferably comprises at least two compounds selected from Formulas VIII-1 to VIII-19.

The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula IX.

wherein R ₁₃ and R ₁₄ each independently represent an alkyl group having 1-15 carbon atoms, an alkenyl group having 2-15 carbon atoms, or an alkoxy group having 1-15 carbon atoms, and one or more non-adjacent -CH ₂ - groups in R ₁₃ are optionally substituted with a cyclopropylene group or a cyclopentyl group; Z ₁ and Z ₂ each independently represent a single bond, -CH ₂ O-, or -CH ₂ -CH ₂ -; and a and b each independently represent 0, 1, or 2; 、 Each independently expresses 、 、 、 or ; and when a and b represent 2, the two 、 Select the same or different.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX is selected from the group consisting of compounds represented by the following formulae IX-1 to IX-12.

wherein R ₁₃ and R ₁₄ each independently represent an alkyl group having 1 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms; and one or more non-adjacent -CH ₂ - groups in R ₁₃ are optionally substituted by a cyclopropylene group or a cyclopentyl group.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-1 is selected from the group consisting of compounds represented by the following formulae IX-1-1 to IX-1-9.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-2 is selected from the group consisting of compounds represented by the following formulae IX-2-1 to IX-2-5.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-4 is selected from the group consisting of compounds represented by the following formulae IX-4-1 to IX-4-12.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-5 is selected from the group consisting of compounds represented by the following formulae IX-5-1 to IX-5-8.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-6 is selected from the group consisting of compounds represented by the following formulae IX-6-1 to IX-6-18.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-7 is selected from the group consisting of compounds represented by the following formulae IX-7-1 to IX-7-11.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-8 is selected from the group consisting of compounds represented by the following formulas IX-8-1 to IX-8-22.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-10 is selected from the group consisting of compounds represented by the following formulae IX-10-1 to IX-10-23.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-11 is selected from the group consisting of compounds represented by the following formulae IX-11-1 to IX-11-16.

In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-12 is selected from the group consisting of compounds represented by the following formulae IX-12-1 to IX-12-6.

[Liquid crystal display element or liquid crystal display]

The present invention also provides a liquid crystal display element or liquid crystal display comprising the above-mentioned liquid crystal composition.

Preferably, the aforementioned liquid crystal display element can be an active matrix addressed liquid crystal display element or a liquid crystal display.

Preferably, the active matrix addressed liquid crystal display element is a VA-TFT, FFS-TFT or IPS-TFT liquid crystal display element.

The liquid crystal display element or liquid crystal display of the present invention comprises the crystal composition of the present invention and can be used to develop liquid crystal display elements or liquid crystal displays that have good resistance to high temperature and high humidity and a wide operating temperature range.

Embodiment

To more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the detailed description below is illustrative rather than restrictive and should not limit the scope of protection of the present invention. The embodiments and comparative examples in this specification are provided to more fully illustrate the present invention to those skilled in the art. Various modifications can be made based on the embodiments and comparative examples in this specification, and the scope of protection of the present invention should not be limited solely to the embodiments and comparative examples described in detail below.

In the present invention, the preparation methods are conventional methods unless otherwise specified. The raw materials used are available from publicly available commercial channels unless otherwise specified. Percentages are by mass. Temperature is in degrees Celsius (°C). The liquid crystal compound is also a liquid crystal monomer. The specific meanings and test conditions of other symbols are as follows: Cp represents the clearing point of the liquid crystal (°C), tested by DSC quantitative method; SN represents the melting point of the liquid crystal from the crystalline state to the nematic phase (°C); Δn represents the optical anisotropy, Δn= _ne - _no , where _no is the refractive index of ordinary light and _ne is the refractive index of extraordinary light, and the test conditions are 25±2°C, 589nm, and Abbe refractometer. Δε represents the dielectric anisotropy, Δε= _ε∥ - _ε⊥ , where _ε∥ is the dielectric constant parallel to the molecular axis, ε _⊥ is the dielectric constant perpendicular to the molecular axis, tested at 25±0.5°C, a 20-micron parallel cell, and an INSTEC: ALCT-IR1. _γ1 represents the rotational viscosity (mPa.s), tested at 25±0.5°C, a 20-micron perpendicular cell, and an INSTEC: ALCT-IR1. _K11 represents the splay elastic constant, _K33 represents the bending elastic constant, and _K22 represents the torsion elastic constant. Test conditions are 25±2°C, an INSTEC: ALCT-IR1, and a 20-micron perpendicular cell. VHR represents the voltage holding ratio (%), tested at 60±1°C, a voltage of ±5V, a pulse width of 10ms, and a voltage hold time of 1.667s. The test equipment used was a TOYO Model 6254 LCD performance comprehensive tester. τ(-20°C): Low-temperature response time (ms), measured at -20°C using a DMS505 tester. Test conditions: IPS test cell with a cell thickness of 3.5μm, drive voltage of 5.5V. Image retention: The image retention of LCD devices is determined by visually inspecting the residual level of the fixed pattern when the display area is uniformly displayed after displaying a specified fixed pattern for 1000 hours. The level of residual image is rated on a four-level scale:

◎No residue left

○ There is a very small amount of residue, which is an acceptable level.

△ There are residues, which is an unacceptable level.

× There are some residues, quite bad.

The liquid crystal composition is prepared as follows: Each liquid crystal monomer is weighed according to a specific ratio and placed into a stainless steel beaker. The stainless steel beaker containing each liquid crystal monomer is placed on a magnetic stirrer to heat and melt. Once the liquid crystal monomers in the stainless steel beaker are mostly melted, a magnetic rotor is added to the stainless steel beaker to stir the mixture evenly. After cooling to room temperature, the liquid crystal composition is obtained.

The liquid crystal monomer structure of the embodiment of the present invention is represented by a code. The code representation method of the liquid crystal ring structure, end group, and connecting group is shown in Table 2 and Table 3 below.

Table 2 Corresponding codes of ring structures

For example: , its code is CC-Cp-V1; , whose code is PGP-Cpr1-2; , its code is CPP-3-2V1; , its code is CPY-3-O2; , its code is Sc-CpO-O2; , its code is CC-3-V; , its code is CC-3-2V1; , its code is PPY-3-O2; , its code is CCY-3-O2; , its code is CLY-2-O2; , its code is PP-1-2V1; , its code is COY-2-O2; , its code is DPUQU-3-F; , its code is CPU-3-F; , whose code is CCGU-3-F.

Comparative compound:

Preparation of liquid crystal composition matrix M1 to M4, M1-1, M4-1:

The compositions represented by the aforementioned matrix liquid crystals M1 to M4, M1-1, and M4-1, wherein M1 and M1-1 are corresponding matrix liquid crystals, and the matrix liquid crystal represented by M1-1 does not contain the compound represented by Formula I of the present invention, have a higher clearing point and a faster response speed, particularly a faster low-temperature response speed, while maintaining comparable optical anisotropy and dielectric anisotropy; and M4 and M4-1 are corresponding matrix liquid crystals, and the matrix liquid crystal represented by M4-1 does not contain the compound represented by Formula I of the present invention, and have a higher clearing point and a faster response speed, particularly a faster low-temperature response speed, while maintaining comparable optical anisotropy and dielectric anisotropy.

Compounds TJ1-1 and TJ2-3 were added to liquid crystal matrices M1 to M4, M1-1, and M4-1 to prepare liquid crystal compositions of Example 1-4 and Comparative Example 1-2, as follows:

Backlight aging was performed on Examples 1-4 and Comparative Examples 1-2: The liquid crystal composition was poured into a test cell, which was placed on a backlight panel for 500 hours with power applied, the temperature controlled at 60°C, and the backlight intensity at 25,000 nits. A black and white checkerboard pattern was then fired at room temperature for 2 hours, and then image artifacts were observed at 127 grayscale levels. Table 7 shows the backlight aging and image artifact data.

Compounds TJ1-1, TJ2-3, D1, D2, and D3 were added to the matrix liquid crystal M1 to prepare liquid crystal compositions according to Examples 5-7 and Comparative Examples 3-9.

Backlight aging was performed on Examples 5-7 and Comparative Examples 3-9: The liquid crystal composition was poured into a test cell, which was placed on a backlight panel for 500 hours with power applied, the temperature controlled at 60°C, and the backlight intensity at 25,000 nits. A black and white checkerboard pattern was then fired at room temperature for 2 hours, and then image artifacts were observed at 127 grayscale levels. Table 7 shows the backlight aging and image artifact data.

Compounds TJ1-1, TJ2-3, D1, D2, and D3 were added to the mother liquid crystal M4 to prepare liquid crystal compositions of Examples 8-10 and Comparative Examples 10-16.

Backlight aging was performed on Examples 8-10 and Comparative Examples 10-16: The liquid crystal composition was poured into a test cell, which was placed on a backlight panel for 500 hours with power applied, the temperature controlled at 60°C, and the backlight intensity at 25,000 nits. A black and white checkerboard pattern was then fired at room temperature for 2 hours, and then the images were evaluated for residual imaging at 127 grayscale levels. Table 7 shows the backlight aging and residual imaging experimental data.

Prepare the mother liquid crystals M5 to M6, M5-1, M6-1, and M6-2 of the liquid crystal composition:

The composition represented by the aforementioned matrix liquid crystals M5 to M6, M5-1, M6-1, and M6-2, wherein M5 and M5-1 are corresponding matrix liquid crystals, and the matrix liquid crystal represented by M5-1 does not contain the compound represented by Formula I of the present invention, while maintaining comparable dielectric anisotropy, M5 has a greater optical anisotropy, a higher clearing point, and a faster response speed, particularly a faster low-temperature response speed. M6, M6-1, and M6-2 are corresponding matrix liquid crystals, and the matrix liquid crystals represented by M6-1 and M6-1 do not contain the compound represented by Formula I of the present invention, while maintaining comparable dielectric anisotropy and optical anisotropy, M6 has a higher clearing point and a faster response speed, particularly a faster low-temperature response speed.

Compounds TJ1-1 and TJ2-3 were added to liquid crystal matrices M5 to M6, M5-1, M6-1, and M6-2 to prepare liquid crystal compositions of Examples 11 and 12 and Comparative Examples 17 to 19, as follows:

Examples 11-12 and Comparative Examples 17-19 were subjected to backlight aging: the liquid crystal composition was poured into a test cell, which was placed on a backlight panel for 500 hours with power applied, the temperature controlled at 60°C, and the backlight intensity at 25,000 nits. A black and white checkerboard pattern was then fired at room temperature for 2 hours, and then image artifacts were observed at 127 grayscale levels. Table 7 shows the backlight aging and image artifact data.

Compounds TJ1-1, TJ2-3, D1, D2, and D3 were added to the mother liquid crystal M5 to prepare liquid crystal compositions (Examples 13-15 and Comparative Examples 20-26).

Examples 13-15 and Comparative Examples 20-26 were subjected to backlight aging: the liquid crystal composition was poured into a test cell, which was placed on a backlight panel for 500 hours with power applied, the temperature controlled at 60°C, and the backlight intensity at 25,000 nits. A black and white checkerboard pattern was then fired at room temperature for 2 hours, and then image artifacts were observed at 127 grayscale levels. Table 7 shows the backlight aging and image artifact data.

Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Persons skilled in the art will appreciate that other variations or modifications may be made based on the above description. It is not possible to list all possible implementations here. Any obvious variations or modifications derived from the technical solution of the present invention remain within the scope of protection of the present invention.

Claims (17)

A liquid crystal composition comprising one or more compounds of formula I, and further comprising an additive of a compound of formula TJ1 and a compound of formula TJ2, I TJ1 TJ2 wherein _R1 represents a chain alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms; _R2 represents a chain alkyl group having 1 to 15 carbon atoms; R represents a chain alkyl group having 1-10 carbon atoms; _R0 represents a chain alkyl group having 1-5 carbon atoms; based on the total mass content of the liquid crystal composition being 100%, the mass addition amount of the compound represented by TJ1 is 0.002-0.01%, and the mass addition amount of the compound represented by TJ2 is 0.02-0.1%; wherein the mass content of the compound represented by Formula I in the liquid crystal composition is 5-20%, and the ratio of the mass addition amount of the compound represented by TJ1 to the mass addition amount of the compound represented by TJ2 is less than or equal to 1/3. The liquid crystal composition according to claim 1, wherein the compound represented by formula I is selected from the group consisting of compounds represented by formulas I-1 to I-11 below, I-1 I-2 I-3 I-4 I-5 I-6 I-7 I-8 I-9 I-10 I-11 The compound represented by formula TJ1 is selected from the group consisting of compounds represented by formulas TJ1-1 to TJ1-7 below, TJ1-1 TJ1-2 TJ1-3 TJ1-4 TJ1-5 TJ1-6 TJ1-7 The compound represented by formula TJ2 is selected from the group consisting of compounds represented by formulas TJ2-1 to TJ2-5 below, TJ2-1 TJ2-2 TJ2-3 TJ2-4 TJ2-5. The liquid crystal composition according to claim 1 further comprises one or more compounds represented by formula II, II wherein, R ₃ represents a chain alkyl group having 1 to 15 carbon atoms, and one or more non-adjacent -CH ₂ - groups in R ₃ are optionally substituted by cyclopentylene or cyclopropylene; and X ₁ represents -H or -CH ₃ . According to the liquid crystal composition shown in claim 3, the compound represented by formula II is selected from the group consisting of compounds represented by formulas II-1 to II-6 below, II-1 II-2 II-3 II-4 II-5 II-6. The liquid crystal composition according to claim 1 further comprises one or more compounds represented by formula III, III wherein R ₄ represents a chain alkyl group having 1 to 15 carbon atoms. The liquid crystal composition according to claim 5, wherein the mass content of the compound represented by formula III is 3-17%. The liquid crystal composition according to claim 1 further comprises one or more compounds represented by formula IV, IV wherein R ₅ and R ₆ each independently represent an alkyl group having 1 to 15 carbon atoms, and any one or more -CH ₂ - in the alkyl group are each independently optionally replaced by -C≡C-, -CH=CH-, or -O- in such a manner that the O atoms are not directly connected to each other. The liquid crystal composition according to claim 7, wherein the compound represented by formula IV comprises at least the compound represented by formula IV-1, IV-1. The liquid crystal composition according to claim 1 further comprises one or more compounds represented by formula V, V The liquid crystal composition further comprises one or more compounds represented by formula VI, VI wherein R ₇ , R ₈ , R ₉ and R ₁₀ each independently represent a chain alkyl group having 1 to 15 carbon atoms, a chain alkoxy group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms; express or . The liquid crystal composition according to claim 9, wherein the compound represented by formula V is selected from the group consisting of compounds represented by the following formulas V-1 to V-6, V-1 V-2 V-3 V-4 V-5 V-6 The compound represented by formula VI is selected from the group consisting of compounds represented by formulas VI-1 to VI-19 below, VI-1 VI-2 VI-3 VI-4 VI-5 VI-6 VI-7 VI-8 VI-9 VI-10 VI-11 VI-12 VI-13 VI-14 VI-15 VI-16 VI-17 VI-18 VI-19. The liquid crystal composition according to claim 10, wherein the mass content of the compound represented by formula V is 4-15%. The liquid crystal composition according to claim 1 further comprises one or more compounds represented by formula VII, VII wherein R ₁₁ represents a chain alkyl group having 1 to 15 carbon atoms, and one or more non-adjacent -CH ₂ - groups in R ₁₁ are optionally substituted by cyclopentylene or cyclopropylene; X ₂ represents -H or -F; and X ₃ represents -H or -CH ₃ . The liquid crystal composition according to claim 12, wherein the compound represented by formula VII is selected from the group consisting of compounds represented by formulas VII-1 to VII-9 below, VII-1 VII-2 VII-3 VII-4 VII-5 VII-6 VII-7 VII-8 VII-9. The liquid crystal composition according to claim 1 further comprises one or more compounds represented by formula VIII, VIII wherein R ₁₂ represents an alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms; X ₄ and X ₅ each independently represent -H or -F; m represents 1, 2 or 3; express 、 、 、 or , and when m represents 2 or 3, two or three Choose the same or different. The liquid crystal composition according to claim 1 further comprises one or more compounds represented by formula IX, IX wherein R ₁₃ and R ₁₄ each independently represent an alkyl group having 1-15 carbon atoms, an alkenyl group having 2-15 carbon atoms, or an alkoxy group having 1-15 carbon atoms, and one or more non-adjacent -CH ₂ - groups in R ₁₃ are optionally substituted with a cyclopropylene group or a cyclopentyl group; Z ₁ and Z ₂ each independently represent a single bond, -CH ₂ O-, or -CH ₂ -CH ₂ -; a and b each independently represent 0, 1, or 2; 、 Each independently expresses 、 、 、 or ; and when a and b represent 2, the two 、 Select the same or different. A liquid crystal display device comprises the liquid crystal composition according to any one of claims 1 to 15, wherein the liquid crystal display device is an active matrix display device. A liquid crystal display comprises the liquid crystal composition according to any one of claims 1 to 15, wherein the liquid crystal display is an active matrix display.