TWI781385B - Liquid crystal composition, liquid crystal display element, liquid crystal display - Google Patents

Abstract

The invention relates to a liquid crystal composition, and a liquid crystal display element and a liquid crystal display comprising the liquid crystal composition belong to the field of liquid crystal displays. The liquid crystal composition of the present invention comprises a compound represented by formula I and at least two compounds represented by formula II, and the liquid crystal composition has large optical anisotropy, high-definition bright spots, and after UV light and high temperature treatment Good stability.

Description

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

The invention belongs to the field of liquid crystal display, and more specifically relates to a liquid crystal composition, a liquid crystal display element and a liquid crystal display containing the liquid crystal composition.

Liquid crystal display elements are divided into the following modes according to the display mode: twisted nematic (TN) mode, super twisted nematic (STN) mode, in-plane mode (IPS), and vertical alignment (VA) mode. Regardless of the display mode, the liquid crystal composition needs to have the following characteristics: (1) stable chemical and physical properties; (2) low viscosity; (3) suitable dielectric Δε; (4) suitable refractive index Δn; (5) Good miscibility with other liquid crystal compounds.

The early commercial TFT-LCD products basically adopted the TN display mode, and the biggest problem was the narrow viewing angle. With the increase of product size, especially in the application of TV field, IPS display mode and VA display mode with wide viewing angle are developed and applied in turn.

低的驅動電壓：液晶材料具有適當的負介電各向異性和彈性係數K；

快速回應：液晶材料具有適當的旋轉黏度γ₁和彈性係數K；

高可靠性：高的電荷保持率，高的比電阻值，優良的耐高溫穩定性及對UV光或常規的背光照明來照射的穩定性有嚴格要求等的特點。隨著液晶顯示器的廣泛應用，對其性能的要求也在不斷的提高，高 的對比度可使顯示器圖像清晰、圖像細節、灰度層次等各方面顯著提高，通常的做法是在不同的顯示模式下，將△nd設計成固定值，以使對比度最優化，並獲得較好的視角，同時回應速度也受到液晶盒的厚度(d)較大的影響，液晶盒厚度的增大使電壓對液晶分子扭轉的整體控制能力削弱，因此研究液晶化合物的不同組合來使各方面性能達到平衡是一直努力的熱門方向。 However, the liquid crystal media used in display elements such as FFS mode, IPS mode, and VA mode are not perfect in themselves. For the liquid crystal materials used in display devices, it is required to have

Low driving voltage: liquid crystal materials have appropriate negative dielectric anisotropy and elastic coefficient K;

Quick response: Liquid crystal materials have appropriate rotational viscosity γ ₁ and elastic coefficient K;

High reliability: high charge retention rate, high specific resistance value, excellent high temperature stability and strict requirements on the stability of UV light or conventional backlight illumination. With the wide application of liquid crystal displays, the requirements for their performance are also constantly improving. High contrast can significantly improve the clarity of the display image, image details, gray levels, etc. In this mode, △nd is designed to be a fixed value to optimize the contrast and obtain a better viewing angle. At the same time, the response speed is also affected by the thickness (d) of the liquid crystal cell. The increase of the thickness of the liquid crystal cell makes the voltage on the liquid crystal The overall control ability of molecular torsion is weakened, so it is a hot direction to study different combinations of liquid crystal compounds to balance all aspects of performance.

The liquid crystal material should not only have the above characteristics, but also the liquid crystal material should have a wide temperature range of nematic phase to meet the wide range of application fields of liquid crystal panels, such as automotive liquid crystal displays need to meet a wider operating temperature to adapt to the temperature of various regions and climates Changes; LCD displays of industrial control products also need to meet a wider operating temperature to adapt to temperature changes in different operating environments.

In practical applications, the response speed of our liquid crystal materials also needs to be further improved.

Researching different combinations of liquid crystal compounds to achieve a balance in all aspects of performance has always been a hot topic in the field of liquid crystals. However, in the prior art, it is difficult for liquid crystal materials to obtain high optical anisotropy, high clearing point, good stability after UV light and high temperature treatment, and fast response speed at the same time.

In order to solve the problems in the prior art that the optical anisotropy of the liquid crystal composition is not large enough, the clearing point is not high enough, and it cannot have good stability after UV light and high temperature treatment, the inventors of the present invention have conducted in-depth research and found that by using the present invention The liquid crystal composition can solve at least one of the aforementioned problems, thus completing the present invention.

Another object of the present invention is to provide a liquid crystal display device comprising the liquid crystal composition of the present invention, and the liquid crystal display device has a fast response speed.

Another object of the present invention is to provide a liquid crystal display comprising the liquid crystal composition of the present invention, and the liquid crystal display has a fast response speed.

In order to achieve the above object, the present invention adopts the following technical scheme: the present invention provides a liquid crystal composition comprising a compound represented by formula I and at least two compounds represented by formula II,

In formula II, R ₁ and R ₂ each independently represent an alkyl group with 1-10 carbon atoms.

The present invention also provides a liquid crystal display element, which comprises the liquid crystal composition of the present invention, and the liquid crystal display element is an active matrix addressable display element or a passive matrix addressable display element.

The present invention also provides a liquid crystal display comprising the liquid crystal composition of the present invention, and the liquid crystal display is an active matrix addressing display or a passive matrix addressing display.

The beneficial effect of the present invention lies in that the liquid crystal composition of the present invention has larger optical anisotropy or high clearing point, and thus can expand the working temperature range of the liquid crystal composition. In addition, the liquid crystal composition of the present invention has higher stability after UV irradiation and high temperature treatment. The liquid crystal material containing the liquid crystal composition of the invention has low driving voltage and fast response speed, thereby achieving the effect of improving the performance of the liquid crystal display.

detailed description

[Liquid Crystal Composition]

The liquid crystal composition of the present invention comprises a compound represented by formula I and at least two compounds represented by formula II,

式II中，R₁、R₂各自獨立地表示碳原子數為1-10的烷基。

In formula II, R ₁ and R ₂ each independently represent an alkyl group with 1-10 carbon atoms.

The technical solution of the present invention has appropriate dielectric anisotropy and rotational viscosity, can increase the optical anisotropy and clearing point of the liquid crystal composition, and at the same time improve the stability after UV light and high temperature, including the liquid crystal composition of the present invention Advanced liquid crystal display elements and liquid crystal displays have a fast response speed.

Examples of the aforementioned alkyl group having 1 to 10 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, and Base, hexyl, heptyl, octyl, nonyl, decyl, etc.

Examples of the aforementioned alkoxy group having 1 to 10 carbon atoms include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, pentyloxy Base, hexyloxy, heptyloxy, octyloxy, nonyloxy, decyloxy, etc.

As a group in which any one or more unconnected -CH ₂ - in the aforementioned alkyl groups with 1-10 carbon atoms is optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene, there are listed For example, cyclopentyl, cyclobutyl, cyclopropyl, cyclopentylmethyl, cyclobutylmethyl, cyclopropylmethyl, cyclopentylethyl, cyclobutylethyl, cyclopropylethyl, cyclo Amylpropyl, cyclobutylpropyl, cyclopropylpropyl, etc., but not limited to these groups.

As a group obtained by optionally substituting cyclopentylene, cyclobutylene or cyclopropylene with any one or more unconnected -CH ₂ - in the aforementioned alkoxy groups with 1-10 carbon atoms, it can be Examples include cyclopentyloxy, cyclobutyloxy, cyclopropyloxy, cyclopentylmethoxy, cyclobutylmethoxy, cyclopropylmethoxy, cyclopentylethoxy, cyclobutyl ethoxy, cyclopropylethoxy, cyclopentylpropoxy, cyclobutylpropoxy, cyclopropylpropoxy, etc., but not limited to these groups.

式III中，R₃、R₄各自獨立地表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基，或者氟取代的碳原子數為3-8的鏈烯氧基；R₃、R₄所示基團中任意一個或多個不相鄰的-CH₂-任選被亞環戊基、亞環丁基或亞環丙基取代；作為前述亞環戊基、亞環丁基，可以列舉出例如，1,2-亞環戊基，1,3-亞環戊基，1,2-亞環丁基，1,3-亞環丁基；Z₁、Z₂各自獨立地表示單鍵、-CH₂CH₂-、-OCH₂-或-CH₂O-；

、

各自獨立地表示1,4-亞環己基、1,4-亞苯基或氟代1,4-亞苯基；m表示0或1；n表示0、1或2。 According to one embodiment, the liquid crystal composition of the present invention further includes one or more compounds represented by formula III:

In formula III, R ₃ and R ₄ each independently represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, Alkoxy group with 1-10 carbon atoms substituted by fluorine, alkenyl group with 2-10 carbon atoms, alkenyl group with 2-10 carbon atoms substituted by fluorine, and alkenyl group with 3-8 carbon atoms Alkenyloxy, or alkenyloxy with 3-8 carbon atoms substituted by fluorine; any one or more non-adjacent -CH ₂ - in the groups represented by R ₃ and R ₄ Pentyl, cyclobutylene or cyclopropylene; As the aforementioned cyclopentylene and cyclobutylene, for example, 1,2-cyclopentylene, 1,3-cyclopentylene, 1 ,2-cyclobutylene, 1,3-cyclobutylene; Z ₁ and Z ₂ each independently represent a single bond, -CH ₂ CH ₂ -, -OCH ₂ - or -CH ₂ O-;

,

Each independently represents 1,4-cyclohexylene, 1,4-phenylene or fluoro-1,4-phenylene; m represents 0 or 1; n represents 0, 1 or 2.

The aforementioned compound represented by formula III has negative dielectric anisotropy, and the driving voltage of the liquid crystal composition can be adjusted by including the compound represented by formula III in the liquid crystal composition of the present invention.

The "fluorine substitution" in the aforementioned fluorine-substituted alkyl group with 1-10 carbon atoms and fluorine-substituted alkenyl group with 2-10 carbon atoms can be substituted with monofluorine, or substituted with difluoro, trifluoro Substitution, such as polyfluorine substitution, may also be perfluoro substitution, and the number of fluorine substitutions is not particularly limited. For example, the alkyl group having 1 to 10 carbon atoms substituted by fluorine includes fluoromethyl, difluoromethyl, trifluoromethyl, 1-fluoroethyl, 2-fluoroethyl, 1 , 2-difluoroethyl, 1,1-difluoroethyl, 1,1,2-trifluoroethyl, 1,1,1,2,2-pentafluoroethyl, etc., but not limited thereto.

In the liquid crystal composition of the present invention, according to one embodiment, the compound represented by the aforementioned formula III is selected from the group consisting of compounds represented by the following formula III-1-III-10:

其中：R₃₁、R₄₁各自獨立地表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基，或者氟取代的碳原子數為3-8的鏈烯氧基；R₃₁、R₄₁所示基團中任意一個或多個不相鄰的-CH₂-任選被亞環戊基、亞環丁基或亞環丙基取代；作為前述亞環戊基、亞環丁基，可以列舉出例如，1,2-亞環戊基，1,3-亞環戊基，1,2-亞環丁基，1,3-亞環丁基。

Wherein: R ₃₁ and R ₄₁ each independently represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkyl group substituted with fluorine Alkoxy groups with 1-10 carbon atoms, alkenyl groups with 2-10 carbon atoms, alkenyl groups with 2-10 carbon atoms substituted by fluorine, alkenyl groups with 3-8 carbon atoms Oxygen, or alkenyloxyl with 3-8 carbon atoms substituted by fluorine; any one or more non-adjacent -CH ₂ - in the groups represented by R ₃₁ and R ₄₁ are optionally replaced by cyclopentylene , cyclobutylene or cyclopropylene; as the aforementioned cyclopentylene and cyclobutylene, for example, 1,2-cyclopentylene, 1,3-cyclopentylene, 1,2 -Cyclobutylene, 1,3-cyclobutylene.

其中，R₅、R₆表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基，或者氟取代的碳原子數為2-10的鏈烯基；

、

各自獨立地表示1,4-亞環己基、1,4-亞環己烯基或1,4-亞苯基。 The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula IV:

Among them, R ₅ and R ₆ represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or a carbon atom substituted with fluorine An alkoxy group with 1-10 carbon atoms, an alkenyl group with 2-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms substituted by fluorine;

,

Each independently represents a 1,4-cyclohexylene group, a 1,4-cyclohexenylene group, or a 1,4-phenylene group.

By including the compound represented by formula IV in the liquid crystal composition of the present invention, the miscibility of the liquid crystal composition can be reduced, and the rotational viscosity can be reduced, thereby improving the response speed of the liquid crystal composition of the present invention.

In the liquid crystal composition of the present invention, according to one embodiment, the compound represented by the aforementioned formula IV is selected from the group consisting of compounds represented by the following formulas IV-1-IV-3:

其中，R₅、R₆表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基，或者氟取代的碳原子數為2-10的鏈烯基。

Among them, R ₅ and R ₆ represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or a carbon atom substituted with fluorine An alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, or an alkenyl group having 2-10 carbon atoms substituted with fluorine.

其中，R₇、R₈各自獨立地表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基，或者氟取代的碳原子數為2-10的鏈烯基；

、

各自獨立地表示1,4-亞環己基、1,4-亞環己烯基或1,4-亞苯基。 The liquid crystal composition of the present invention, according to an embodiment, the aforementioned liquid crystal composition further comprises one or more compounds represented by formula V other than the compound represented by formula I:

Wherein, R ₇ and R ₈ each independently represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkyl group with 1-10 carbon atoms substituted by fluorine. an alkoxy group with 1-10 carbon atoms, an alkenyl group with 2-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms substituted by fluorine;

,

Each independently represents a 1,4-cyclohexylene group, a 1,4-cyclohexenylene group, or a 1,4-phenylene group.

By including the compound represented by formula V in the liquid crystal composition of the present invention, the optical anisotropy of the liquid crystal composition and the clearing point of the liquid crystal composition can be increased, which is beneficial to improve the response speed of the liquid crystal composition.

In the liquid crystal composition of the present invention, according to one embodiment, the aforementioned compound represented by formula V other than the compound represented by formula I is selected from the group consisting of compounds represented by the following formulas V-1-V-3:

其中，R₇、R₈各自獨立地表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基，或者氟取代的碳原子數為2-10的鏈烯基。

Wherein, R ₇ and R ₈ each independently represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkyl group with 1-10 carbon atoms substituted by fluorine. An alkoxy group with 1-10 carbon atoms, an alkenyl group with 2-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms substituted by fluorine.

其中，R₉表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基，或者氟取代的碳原子數為1-10的烷氧基，這些基團中任意一個或多個不相鄰的-CH₂-任選被亞環戊基、亞環丁基或亞環丙基取代；作為前述亞環戊基、亞環丁基，可以列舉出例如，1,2-亞環戊基，1,3-亞環戊基，1,2-亞環丁基，1,3-亞環丁基；R₁₀表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基，或者氟取代的碳原子數為1-10的烷氧基；X表示O或S。 In the liquid crystal composition of the present invention, preferably also comprise one or more compounds shown in formula VI:

Wherein, R ₉ represents an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxyl group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine. 1-10 alkoxy groups, any one or more non-adjacent -CH ₂ - in these groups is optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; as the aforementioned cyclopentylene , cyclobutylene, for example, 1,2-cyclopentylene, 1,3-cyclopentylene, 1,2-cyclobutylene, 1,3-cyclobutylene; R ₁₀ represents An alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkane with 1-10 carbon atoms substituted by fluorine Oxygen; X represents O or S.

By including the compound represented by the aforementioned formula VI in the liquid crystal composition of the present invention, the liquid crystal composition can have relatively large negative dielectric anisotropy, which is beneficial to reduce the driving voltage of the device.

In the liquid crystal composition of the present invention, according to one embodiment, the compound represented by the aforementioned formula VI is selected from the group consisting of compounds represented by the following formulas VI-1-VI-12:

其中，R₉₁、R₁₀₁表示碳原子數為1-10的烷基。

Wherein, R ₉₁ and R ₁₀₁ represent an alkyl group with 1-10 carbon atoms.

In the liquid crystal composition of the present invention, the addition amount (mass ratio) of the compound shown in formula I in the liquid crystal composition is 1-15%, according to an embodiment, it is 3-11%; the compound shown in formula II is added in the liquid crystal composition The addition amount (mass ratio) in the liquid crystal composition is 1-20%, according to another embodiment is 3-8%; the addition amount (mass ratio) of the compound shown in formula III in the liquid crystal composition is 1-50%, according to another One embodiment is 25-40%; the addition amount (mass ratio) of the compound shown in the formula IV in the liquid crystal composition is 0-50%, according to another embodiment is 20-40%; the compound shown in the formula V is in the liquid crystal composition The addition amount (mass ratio) in the composition is 0-33%, according to another embodiment, it is 5-20%; the addition amount (mass ratio) of the compound shown in formula VI in the liquid crystal composition is 0-20%, According to yet another embodiment it is 3-15%.

In the liquid crystal composition of the present invention, according to an embodiment, various functional dopants can also be added. In the case of containing a dopant, the content of the dopant is based on the mass of the liquid crystal composition in an embodiment The percentage is 0.01-1.5%. Examples of these dopants include antioxidants, ultraviolet absorbers, and chiral agents.

Antioxidants can be listed as,

t表示1-10的整數；手性劑可以列舉出，

R表示碳原子數為1-10的烷基；光穩定劑可以列舉出，

Z₀表示碳數為1-20的亞烷基，所述亞烷基中任意的一個或多個氫任選被鹵素取代，任意的一個或多個不相鄰-CH₂-任選被-O-取代；紫外線吸收劑可以列舉出，

R₀₁表示碳原子數為1-10的烷基。

t represents the integer of 1-10; Chiral agent can enumerate,

R represents the alkyl group that carbon number is 1-10; Light stabilizer can enumerate,

Z ₀ represents an alkylene group with a carbon number of 1-20, and any one or more hydrogens in the alkylene group are optionally substituted by halogen, and any one or more non-adjacent -CH ₂ -are optionally replaced by- O-substituted; ultraviolet absorbers can be listed,

R ₀₁ represents an alkyl group having 1-10 carbon atoms.

[Liquid crystal display element or liquid crystal display]

The present invention also relates to a liquid crystal display element or a liquid crystal display comprising any one of the above-mentioned liquid crystal compositions; the display element or display is an active matrix display element or display or a passive matrix display element or display.

According to an embodiment, the liquid crystal display element or liquid crystal display is an active matrix liquid crystal display element or liquid crystal display.

According to another embodiment, the active matrix display element or display is an IPS-TFT, FFS-TFT, VA-TFT liquid crystal display element or display.

The liquid crystal display element or liquid crystal display comprising the aforementioned compound or liquid crystal composition has a wider nematic temperature range, faster response speed, and lower cell thickness.

Example

In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with the examples. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

In this manual, unless otherwise specified, the percentages refer to mass percentages, and the temperature is in degrees Celsius (°C). The specific meanings and test conditions of other symbols are as follows: Cp means liquid crystal clearing point (°C), tested by DSC quantitative method; △n means Optical anisotropy, n _o is the refractive index of ordinary light, _ne is the refractive index of extraordinary light, the test condition is 25±2°C, 589nm, tested by Abbe refractometer; △ε means dielectric anisotropy, △ ε=ε _∥ -ε _⊥ , where, ε _∥ is the dielectric constant parallel to the molecular axis, ε _⊥ is the dielectric constant perpendicular to the molecular axis, the test condition is 25±0.5℃, 20 micron vertical box, INSTEC: ALCT -IR1 test; γ ₁ means rotational viscosity (mPa˙s), the test condition is 25±0.5°C, 20 micron vertical box, INSTEC: ALCT-IR1 test; K ₁₁ is the torsional elastic constant, K ₃₃ is the splay elastic constant, The test conditions are: 25°C, INSTEC: ALCT-IR1, 20 micron vertical cell; VHR means the voltage holding rate (%), the test conditions are 20±2°C, the voltage is ±5V, the pulse width is 10ms, and the voltage hold time is 16.7ms . The test equipment is TOYO Model6254 liquid crystal performance comprehensive tester.

Put each liquid crystal monomer into a stainless steel beaker after weighing according to a certain ratio, place the stainless steel beaker containing each liquid crystal monomer on a magnetic stirring apparatus to heat and melt, and wait until most of the liquid crystal monomer in the stainless steel beaker melts , put a magnetic rotor into a stainless steel beaker, stir the mixture evenly, and cool to room temperature to obtain a liquid crystal composition.

The structure of the liquid crystal monomer in the embodiment of the present invention is represented by a code, and the code representation methods of the liquid crystal ring structure, terminal group, and linking group are shown in Table 1 and Table 2 below.

，其代碼為CC-Cp-V1；

，其代碼為CPY-2-O2；

，其代碼為CCY-3-O2；

，其代碼為COY-3-O2；

，其代碼為CCOY-3-O2；

，其代碼為Sb-CpO-O4；

，其代碼為Sc-CpO-O4。 Example:

, whose code is CC-Cp-V1;

, whose code is CPY-2-O2;

, whose code is CCY-3-O2;

, whose code is COY-3-O2;

, whose code is CCOY-3-O2;

, whose code is Sb-CpO-O4;

, whose code is Sc-CpO-O4.

Example 1

The formula and corresponding properties of the liquid crystal composition are shown in Table 3 below.

Example 2

The formula and corresponding properties of the liquid crystal composition are shown in Table 4 below.

Example 3

The formula and corresponding properties of the liquid crystal composition are shown in Table 5 below.

Example 4

The formula and corresponding properties of the liquid crystal composition are shown in Table 6 below.

Example 5

The formula and corresponding properties of the liquid crystal composition are shown in Table 7 below.

Comparative example 1

The formula and corresponding properties of the liquid crystal composition are shown in Table 8 below.

Replace CLY-3-O2 and CLY-3-O3 in Example 5 with CY-3-O2 and CY-3-O3 respectively, and the rest are the same as in Example 5, as Comparative Example 1. Compared with Comparative Example 1, the optical anisotropy (Δn) of the liquid crystal composition of Example 5 is larger and the clearing point (Cp) is higher, which can be used to develop liquid crystals with low cell thickness, wide temperature display, and fast response monitor.

Example 6

The formula and corresponding properties of the liquid crystal composition are shown in Table 9 below.

Example 7

The formula and corresponding properties of the liquid crystal composition are shown in Table 10 below.

Example 8

The formula and corresponding properties of the liquid crystal composition are shown in Table 11 below.

Example 9

The formula and corresponding properties of the liquid crystal composition are shown in Table 12 below.

Example 10

The formula and corresponding properties of the liquid crystal composition are shown in Table 13 below.

Comparative example 2

The formula and corresponding properties of the liquid crystal composition are shown in Table 14 below.

Replace CLY-4-O2, CLY-3-O2, and CLY-3-O3 in Example 10 with CCOY-4-O2, CCOY-3-O2, and CCOY-3-O3, and the rest are the same as in Example 10 , as Comparative Example 2. Compared with Comparative Example 2, the optical anisotropy (Δn) of the liquid crystal composition of Example 10 is larger, the clearing point (Cp) is higher, γ ₁ /K ₃₃ is smaller, and the response is faster, which can be used for developing Low-profile, fast-response, wide-temperature display LCD.

The reliability of the liquid crystal composition is tested by ultraviolet, high temperature aging test and VHR test.

The smaller the VHR data change before and after the ultraviolet and high temperature test of the liquid crystal composition, the stronger the anti-ultraviolet and high-temperature resistance. Therefore, by comparing the difference of the VHR data of each embodiment and comparative example before and after the test, the ability of anti-ultraviolet and anti-high temperature can be judged.

Firstly, before the UV and high temperature aging test, measure the VHR data of the liquid crystal composition as the initial VHR data, then carry out the UV and high temperature aging test on the liquid crystal composition, and measure the VHR data of the liquid crystal composition again after the test.

Ultraviolet aging test: the liquid crystal composition is placed under an ultraviolet lamp with a wavelength of 365nm and irradiated with 5000mJ energy.

High temperature aging test: the liquid crystal composition is placed in an oven at 100° C. for one hour.

The smaller the change of the VHR data after the aging test relative to the initial VHR data, the stronger the anti-ultraviolet and high-temperature resistance of the liquid crystal composition, so that it can be judged that the stronger the ability of the liquid crystal composition to resist external environmental damage during the working process, Therefore, the reliability of the liquid crystal composition becomes higher.

In addition, the liquid crystal compositions of Example 10 and Comparative Example 2 were poured into a liquid crystal test box to conduct an afterimage test, and the test results are shown in Table 15 above.

It can be seen from Table 15 that the liquid crystal composition of the present invention has very obvious anti-UV and anti-high temperature properties. This shows that the liquid crystal composition of the present invention has good UV resistance and high temperature resistance.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those of ordinary skill in the art can also make It is impossible to exhaustively list all the implementation modes here, and any obvious changes or changes derived from the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims (8)

A liquid crystal composition comprising a compound represented by formula I, at least two compounds represented by formula II, at least one compound represented by formula III-4, and at least one compound represented by formula VI-2,

In formula II, R ₁ represents an alkyl group with 3 carbon atoms, and R ₂ represents an alkyl group with 2 or 3 carbon atoms; in formula III-4, R ₃₁ represents an alkyl group with 3 carbon atoms, and R ₄₁ Represents an alkoxy group with 1 or 2 carbon atoms; in formula VI-2, R ₁₀₁ represents an alkyl group with 4 carbon atoms; the addition amount of the compound shown in the formula I is 8.5% by mass, and the formula II The added amount of the compound shown is 9% by mass, the added amount of the compound represented by the formula III-4 is 25% by mass, and the added amount of the compound represented by the formula VI-2 is 4% by mass. The liquid crystal composition as described in Claim 1, further comprising at least one compound selected from the group consisting of compounds represented by formulas III-1~III-3, III-5~III-10:

Wherein: R ₃₁ represents an alkyl group with 3 carbon atoms; R ₄₁ represents an alkoxy group with 1 or 2 carbon atoms. The liquid crystal composition as described in Claim 2, further comprising one or more compounds represented by formula IV:

In formula IV, R ₅ and R ₆ each independently represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, Alkoxy group with 1-10 carbon atoms substituted by fluorine, alkenyl group with 2-10 carbon atoms, or alkenyl group with 2-10 carbon atoms substituted by fluorine; and

,

Each independently represents a 1,4-cyclohexylene group, a 1,4-cyclohexenylene group, or a 1,4-phenylene group. The liquid crystal composition as claimed in item 3, wherein the compound represented by the formula IV is selected from the group consisting of compounds represented by the formula IV-1-IV-3:

In formula IV-1-IV-3, R ₅ and R ₆ each independently represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, and an alkyl group with 1-10 carbon atoms. An alkoxy group of 10, an alkoxy group having 1-10 carbon atoms substituted by fluorine, an alkenyl group having 2-10 carbon atoms, or an alkenyl group having 2-10 carbon atoms substituted by fluorine. The liquid crystal composition as described in Claim 4, further comprising one or more compounds of formula V other than the compound shown in formula I, the compound shown in formula V:

In formula V, R ₇ and R ₈ each independently represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, Alkoxy group with 1-10 carbon atoms substituted by fluorine, alkenyl group with 2-10 carbon atoms, or alkenyl group with 2-10 carbon atoms substituted by fluorine; and

,

Each independently represents a 1,4-cyclohexylene group, a 1,4-cyclohexenylene group, or a 1,4-phenylene group. The liquid crystal composition as described in claim item 5, wherein the formula V other than the compound shown in the formula I, the compound shown in the formula V is selected from the compounds shown in the formulas V-1~V-3 Group:

Wherein, R ₇ and R ₈ each independently represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkyl group with 1-10 carbon atoms substituted by fluorine. An alkoxy group with 1-10 carbon atoms, an alkenyl group with 2-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms substituted by fluorine. The liquid crystal composition as described in Claim 6, further comprising at least one compound selected from the group consisting of compounds represented by formulas VI-1, VI-3~VI-12:

Wherein, R ₉₁ represents an alkyl group with 1-10 carbon atoms; R ₁₀₁ represents an alkyl group with 4 carbon atoms. A liquid crystal display element or a liquid crystal display, comprising the liquid crystal composition described in any one of claim items 1-7, the liquid crystal display element or liquid crystal display is an active matrix addressing display element or display, or a passive matrix addressing display element or monitor.