CN108239541B - High-transmittance negative dielectric anisotropy liquid crystal composition and display device thereof - Google Patents
High-transmittance negative dielectric anisotropy liquid crystal composition and display device thereof Download PDFInfo
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Abstract
The invention discloses a high-transmittance negative dielectric anisotropyA liquid crystal composition comprising: 20-60% of one or more compounds of general formula I-1 and/or I-2, based on the total weight of the negative liquid crystal composition; 12-40% by weight of the total negative liquid crystal composition of one or more compounds of formula II; 12-40% by weight of the total negative liquid crystal composition of one or more compounds of formula III; 20-60% by weight of the total negative liquid crystal composition of one or more compounds of formula IV. The invention also discloses a liquid crystal display device comprising the liquid crystal composition.
Description
Technical Field
The present invention relates to a liquid crystal composition, and more particularly, to a liquid crystal composition having characteristics of a large absolute value of negative dielectric anisotropy, a high clearing point, a large optical anisotropy, a good low temperature intersolubility, a high voltage holding ratio, a good high temperature stability, a good ultraviolet performance, a high transmittance, and the like, and a liquid crystal display device including the liquid crystal composition.
Background
Liquid crystal display devices have been used in various household electric appliances, measuring devices, panels for automobiles, word processors, electronic notepads, printers, computers, televisions, and the like, from clocks and calculators. Representative liquid crystal display modes include TN (twisted nematic) mode, STN (super twisted nematic) mode, DS (dynamic light scattering) mode, GH (guest host) mode, IPS (in-plane switching) mode, OCB (optically compensated birefringence) mode, ECB (voltage controlled birefringence) mode, VA (vertically aligned) mode, CSH (color super vertical) mode, FLC (ferroelectric liquid crystal) mode, and the like. Further, as a driving method of the liquid crystal display device, a static driving, a multiplex driving, a simple matrix method, an Active Matrix (AM) method of driving by a TFT (thin film transistor), a TFD (thin film diode), or the like can be given.
Among these display systems, the IPS mode, ECB mode, VA mode, CSH mode, and the like have a characteristic of using a liquid crystal composition having a negative dielectric anisotropy Δ ∈. Among these display systems, the VA display system driven by AM is used for display elements (for example, televisions) which require high-speed response and a wide viewing angle.
Liquid crystal materials need to have suitably high dielectric anisotropy, optical anisotropy, and good low-temperature mutual solubility and thermal stability. In addition, the liquid crystal material should also have low viscosity and short response time, low threshold voltage and high contrast. The anisotropy of the composition is further described with reference to a commercially available liquid crystal display device. The temperature range of the nematic phase is associated with the operating temperature range of the element. The upper limit temperature of the nematic phase is preferably 70 ℃ or higher, and the lower limit temperature of the nematic phase is preferably-10 ℃ or lower. The viscosity of the composition correlates to the response time of the element. In order to display animation in the element, it is preferable that the response time of the element is short. Therefore, it is preferable that the viscosity of the composition is small, and it is more preferable that the viscosity of the composition is small at a low temperature.
The optical anisotropy of the composition correlates with the contrast of the element. In order to maximize the contrast ratio of the liquid crystal display element, the product value (Δ n × d) of the optical anisotropy (Δ n) of the liquid crystal composition and the thickness (d) of the liquid crystal layer may be designed to be a fixed value. The appropriate product value depends on the kind of operation mode. A suitable value for an element like TN mode is about 0.45 μm. In this case, a composition having a large optical anisotropy is preferable for an element having a small liquid crystal layer thickness.
A liquid crystal display element containing a liquid crystal composition having a large absolute value of dielectric anisotropy can reduce the base voltage value, reduce the driving voltage, and further reduce the power consumption.
The liquid crystal display element containing the liquid crystal composition with lower threshold voltage can effectively reduce the power consumption of display, and has longer endurance time particularly in consumables and portable electronic products such as mobile phones and tablet computers.
The liquid crystal composition with low viscosity can improve the response speed of the liquid crystal display element. When the response speed of the liquid crystal display element is high, the liquid crystal display element is applicable to animation display. Further, when the liquid crystal composition is injected into the liquid crystal cell of the liquid crystal display element, the injection time can be shortened, and the workability can be improved.
The prior art discloses a liquid crystal composition with low power consumption and fast response, such as patent document CN102858918A, but the prior art has environmental problems (such as use of chlorine-containing compounds), short service life (such as poor UV or thermal stability), low contrast (such as whitening of display screen under sunlight), and cannot balance the performance balance problems of requiring appropriate optical anisotropy, appropriate dielectric anisotropy, high voltage holding ratio, UV stability and high temperature stability in lcd televisions, tablet computers, etc., and cannot simultaneously satisfy all the indexes.
From the preparation angle of the liquid crystal material, various performances of the liquid crystal material are mutually influenced by the influence, and other performances may be changed by the improvement of a certain performance index. Therefore, creative efforts are often required to prepare liquid crystal materials having suitable properties in all aspects.
The liquid crystal material is an important component of the liquid crystal display, and the liquid crystal display has great market demand at present, is mostly used in electronic and electric products, but has a short life cycle. The problem of waste pollution naturally exists in a short life cycle, and under the condition that the current green environmental protection problem is increasingly emphasized by various social circles, if the problem can be controlled from a source, namely, an environment-friendly green material is selected in the modulation process of the liquid crystal material, the environmental cost for treating the waste liquid crystal display can be greatly reduced. Therefore, creative labor is often needed to prepare the liquid crystal material with proper performance in all aspects, economy and environmental protection.
Disclosure of Invention
The invention aims to provide a liquid crystal composition with negative dielectric anisotropy, which has the characteristics of large absolute value negative dielectric anisotropy, higher clearing point, larger optical anisotropy, good low-temperature intersolubility, higher voltage holding ratio, good high-temperature stability, good ultraviolet performance, higher transmittance and the like, so that a liquid crystal display device containing the liquid crystal composition has higher brightness, and particularly can be suitable for an environment with stronger external light.
In order to accomplish the above object of the invention, the present invention provides a liquid crystal composition having negative dielectric anisotropy, comprising:
20-60% of one or more compounds of general formula I-1 and/or I-2, based on the total weight of the negative liquid crystal composition
12-40% by weight of one or more compounds of formula II based on the total weight of the negative liquid crystal composition
12-40% by weight of one or more compounds of the general formula III, based on the total weight of the negative liquid-crystal composition
And
20-60% of one or more compounds of formula IV by weight of the total negative liquid crystal composition
Wherein the content of the first and second substances,
R1、R2、R3、R4、R5、R6、R7and R8The two substituents are the same or different and each independently represent-H, -F, a linear or branched halogenated or unhalogenated alkyl or alkoxy group having 1 to 12 carbon atoms, a linear or branched halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 12 carbon atoms;
a represents 0, 1 or 2, wherein, when a is 2, 2 rings
May be the same or different.
In some embodiments of the invention, it is preferred that R is1、R2、R3、R4、R5、R6、R7And R8The same or different, each independently represents a linear or branched, halogenated or unhalogenated alkyl or alkoxy group having 1 to 5 carbon atoms, or a linear or branched, halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 5 carbon atoms; further preferably said R1、R3、R5、R6、R7And R8The same or different, each independently represents a linear or branched, halogenated or unhalogenated alkyl or alkoxy group having 1 to 5 carbon atoms, or a linear or branched, halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 5 carbon atoms; still more preferably, R is2、R4And R6The alkyl or alkoxy groups are the same or different and each independently represents a linear or branched halogenated or non-halogenated alkyl or alkoxy group having 1 to 5 carbon atoms; particularly preferably said R2、R4And R6The same or different, each independently represents a linear or branched, halogenated or unhalogenated alkoxy group having 1 to 5 carbon atoms.
In some embodiments of the invention, it is preferred that the
Are the same or different and each independently represents
The above-mentioned
May be substituted by a F atom, wherein
Wherein one or more H atoms may be replaced by F atoms, and the substitution positions are not adjacent.
In some embodiments of the present invention, it is preferred that the compounds of formula I-1 and/or I-2 comprise 25 to 60% by weight of the total negative liquid crystal composition; the compound of the general formula II accounts for 12-35% of the total weight of the negative liquid crystal composition; the compound of the general formula III accounts for 12-35% of the total weight of the negative liquid crystal composition; the compound of the general formula IV accounts for 25-55% of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is further preferred that the compounds of formula I-1 and/or I-2 comprise from 30 to 50% by weight of the total negative liquid crystal composition; the compound of the general formula II accounts for 12-30% of the total weight of the negative liquid crystal composition; the compound of the general formula III accounts for 12-30% of the total weight of the negative liquid crystal composition; the compound of the general formula IV accounts for 25-50% of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is further preferred that the compounds of formula I-1 and/or I-2 comprise 30 to 45% by weight of the total negative liquid crystal composition; the compound of the general formula II accounts for 12-20% of the total weight of the negative liquid crystal composition; the compound of the general formula III accounts for 12-20% of the total weight of the negative liquid crystal composition; the compound of the general formula IV accounts for 30-50% of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is further preferred that the compounds of formula I-1 and/or I-2 comprise 30 to 40% by weight of the total negative liquid crystal composition; the compound of the general formula II accounts for 12-18% of the total weight of the negative liquid crystal composition; the compound of the general formula III accounts for 12-18% of the total weight of the negative liquid crystal composition; the compound of the general formula IV accounts for 35-50% of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula I-1 is selected from the group consisting of:
in some embodiments of the present invention, it is particularly preferred that the compound of formula I-1 is selected from the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula I-1 comprises 12 to 35%, more preferably 12 to 30% by weight of the total weight of the negative liquid crystal composition; particularly preferably 14 to 25%.
In some embodiments of the present invention, it is preferred that the compound of formula I-2 is selected from the group consisting of:
in some embodiments of the present invention, it is particularly preferred that the compound of formula I-2 is selected from the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula I-2 comprises 8 to 30%, more preferably 8 to 25% by weight of the total weight of the negative liquid crystal composition; particularly preferably 8 to 22%.
In some embodiments of the present invention, it is preferred that the compound of formula ii is selected from the group consisting of:
in some embodiments of the present invention, it is particularly preferred that the compound of formula ii is selected from the group consisting of:
in some embodiments of the invention, it is preferred that the compound of formula iii is selected from the group consisting of:
in some embodiments of the present invention, it is particularly preferred that the compound of formula iii is selected from the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula iv is selected from one or more compounds of the group consisting of:
wherein the content of the first and second substances,
R7and R8The same or different, each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms.
In some embodiments of the present invention, it is preferred that the compound of formula IV-1 comprises 10 to 35%, more preferably 15 to 32%, and still more preferably 19 to 31% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula IV-2 comprises from 0 to 10%, more preferably from 0 to 8%, even more preferably from 2 to 6% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula IV-3 comprises from 0 to 10%, more preferably from 0 to 8%, and even more preferably from 2 to 8% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula IV-7 comprises from 0 to 10%, more preferably from 0 to 6%, and even more preferably from 2 to 6% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula IV-8 comprises from 0 to 10%, more preferably from 0 to 8%, and even more preferably from 2 to 8% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula IV-9 comprises from 0 to 10%, more preferably from 0 to 9%, and even more preferably from 2 to 7% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula IV-11 comprises from 0 to 10%, more preferably from 0 to 8%, and even more preferably from 2 to 8% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula IV-13 comprises from 0 to 15%, more preferably from 0 to 10%, more preferably from 1 to 10%, more preferably from 2 to 6% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, preferably, the compound of formula IV-1 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-2 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-3 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-4 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-5 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-6 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-7 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-8 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-9 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-10 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-11 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula IV-12 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula IV-13 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula IV-14 is selected from one or more compounds of the group consisting of:
another aspect of the present invention provides a liquid crystal composition having negative dielectric anisotropy, further comprising one or more additives known to those skilled in the art and described in the literature.
The stabilizers which may be added to the mixtures according to the invention are mentioned below, for example.
Preferably, the stabilizer is selected from the group consisting of the stabilizers shown below.
In the embodiment of the present invention, it is preferable that the stabilizer accounts for 0 to 5% by weight of the total weight of the liquid crystal composition; more preferably, the stabilizer accounts for 0-1% of the total weight of the liquid crystal composition; as a particularly preferred scheme, the stabilizing agent accounts for 0.01-0.1% of the total weight of the liquid crystal composition.
In still another aspect of the present invention, there is also provided a liquid crystal display comprising the liquid crystal composition provided by the present invention.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
the invention provides a negative liquid crystal composition
The liquid crystal display device containing the liquid crystal composition has the characteristics of large absolute value negative dielectric anisotropy, higher clearing point, larger optical anisotropy, good low-temperature intersolubility, higher voltage holding ratio, good high-temperature stability, good ultraviolet performance, higher transmittance and the like, so that the liquid crystal display device containing the liquid crystal composition has higher brightness, and can be particularly suitable for the environment with strong external light.
Unless otherwise specified, the proportions recited in the present invention are by weight and all temperatures are in degrees Celsius.
Detailed Description
The invention will be illustrated below with reference to specific embodiments. It should be noted that the following examples are illustrative of the present invention, and are not intended to limit the present invention. Other combinations and various modifications within the spirit or scope of the present invention may be made without departing from the spirit or scope of the present invention.
The liquid crystal displays used in the following embodiments are all negative liquid crystal display devices, and each of the liquid crystal displays has a cell thickness d of 4 μm and is composed of a polarizer (polarizing plate), an electrode substrate, and the like. The display device is in a normally white mode, i.e. when no voltage difference is applied between the row and column electrodes, a viewer perceives a pixel color that is white. The upper and lower polarizer axes on the substrate are at a 90 degree angle to each other. The space between the two substrates is filled with an optical liquid crystal material.
For convenience of expression, in the following examples, the group structure of the liquid crystal composition is represented by the code listed in Table 1:
TABLE 1 radical structural code of liquid crystal compounds
Compounds of the following formula are exemplified:
the structural formula is represented by the code listed in Table 2, and can be expressed as: 2PWP3, 2 in the code indicates a left end of-C2H5And 3 represents a right end of-C3H7(ii) a P in the code represents 1, 4-cyclohexylene; w represents 2, 3-difluoro-1, 4-phenylene.
The abbreviated codes of the test items in the following examples are as follows:
Δ n: optical anisotropy (589nm, 25 ℃ C.)
Δ ε: dielectric anisotropy (1KHz, 25 ℃ C.)
Cp clearing Point (C, nematic-isotropic phase transition temperature)
T: transmittance (DMS 505 box thickness 6 μm)
Wherein the optical anisotropy is obtained by testing an Abbe refractometer under a sodium lamp (589nm) light source at 25 ℃; the dielectric test cell is of the VA type, and the thickness of the cell is 6 mu m.
Δ ∈ | ∈ | — |, where ∈ | is the dielectric constant parallel to the molecular axis and ∈ | is the dielectric constant perpendicular to the molecular axis, test conditions: the test box is VA type at 25 deg.C and 1KHz, and the thickness of the test box is 6 μm.
Conditions for measuring transmittance:
the DMS 505 is used to test the transmittance of a dimmer cell having a thickness of 6 μm.
The components used in the following examples can be synthesized by a known method or obtained commercially. These synthesis techniques are conventional, and the resulting liquid crystal compounds were tested to meet the standards for electronic compounds.
Liquid crystal compositions were prepared according to the compounding ratios of the liquid crystal compositions specified in the following examples. The liquid crystal composition is prepared according to the conventional method in the field, such as heating, ultrasonic wave, suspension and the like, and is mixed according to the specified proportion.
Comparative example 1
The liquid crystal composition of comparative example 1, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared according to the compounds and weight percentages listed in table 2, and the test data are shown in the following table:
TABLE 2 liquid crystal composition formulations and their test properties
Example 1
The liquid crystal composition of example 1 was prepared according to the compounds and weight percentages listed in table 3, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 3 liquid crystal composition formula and its test performance
Comparing example 1 with comparative example 1, it can be seen that the negative liquid crystal composition of the present invention has a large absolute value of negative dielectric anisotropy, a higher optical anisotropy, a higher clearing point and a greater transmittance.
Comparative example 2
The liquid crystal composition of comparative example 2, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared with each compound and weight percentage as listed in table 4, and the test data are shown in the following table:
TABLE 4 liquid crystal composition formula and its test performance
Example 2
The liquid crystal composition of example 2 was prepared according to the compounds and weight percentages listed in table 5, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 5 liquid crystal composition formulations and their test properties
Example 3
The liquid crystal composition of example 3 was prepared according to the compounds and weight percentages listed in table 6, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 6 liquid crystal composition formula and its test performance
It can be seen by comparing example 2, example 3 and comparative example 2 that the negative liquid crystal composition of the present invention has a large absolute value of negative dielectric anisotropy, a higher optical anisotropy, a higher clearing point and a greater transmittance.
Comparative example 3
The liquid crystal composition of comparative example 3, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared with each compound and weight percentage as listed in table 7, and the test data are shown in the following table:
TABLE 7 liquid crystal composition formulations and their test properties
Example 4
The liquid crystal composition of example 4 was prepared according to the compounds and weight percentages listed in table 8, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 8 liquid crystal composition formulations and their test properties
Example 5
The liquid crystal composition of example 5 was prepared according to the compounds and weight percentages listed in table 9, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 9 liquid crystal composition formulations and their test properties
Example 6
The liquid crystal composition of example 6 was prepared according to the compounds and weight percentages listed in table 10, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 10 liquid crystal composition formulations and their test properties
Comparing example 4, example 5, example 6 and comparative example 3, it can be seen that the negative liquid crystal composition of the present invention has a large absolute value of negative dielectric anisotropy, a higher optical anisotropy, a higher clearing point and a greater transmittance.
It can be seen from the above comparative examples and examples that the negative liquid crystal composition of the present invention has a larger absolute value of dielectric anisotropy, a higher optical anisotropy, a higher clearing point, a higher transmittance, a larger dielectric anisotropy and a higher optical anisotropy, so that the liquid crystal composition of the present invention can be adapted to a display device with a larger cell thickness, and the liquid crystal display device using the liquid crystal composition of the present invention has a clearer display effect in an environment with stronger light due to the larger transmittance.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and equivalent changes and modifications made according to the spirit of the present invention should be covered thereby.
Claims (9)
1. A liquid crystal composition having negative dielectric anisotropy, comprising:
at least two compounds of formula I-1 in an amount of 14 to 26% by weight based on the total weight of the negative liquid crystal composition and one or more compounds of formula I-2 in an amount of 8 to 25% by weight based on the total weight of the negative liquid crystal composition
12-40% by weight of one or more compounds of formula II based on the total weight of the negative liquid crystal composition
12-40% by weight of one or more compounds of the general formula III, based on the total weight of the negative liquid-crystal composition
And the compound of the general formula III comprises at least one compound selected from the group consisting of:
and
and
one or more compounds of formula IV in an amount of 20-50% by weight based on the total weight of the negative liquid crystal composition
And the compound of the general formula IV comprises at least one compound of the general formula IV-2 and/or IV-3:
wherein the content of the first and second substances,
R1、R2、R3、R4、R5、R6the two substituents are the same or different and each independently represent-H, -F, a linear or branched halogenated or unhalogenated alkyl or alkoxy group having 1 to 12 carbon atoms, a linear or branched halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 12 carbon atoms;
R7and R8The same or different, each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms;
a represents 0, 1 or 2, wherein, when a is 2, 2 rings
Can be the sameOr may be different.
2. The negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula i-1 is selected from the group consisting of:
3. the negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula i-2 is selected from the group consisting of:
4. the negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula ii is selected from the group consisting of:
5. the negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula iii further comprises a compound selected from the group consisting of:
and
6. the liquid crystal composition of negative dielectric anisotropy according to claim 1, wherein the compound of the general formula iv further comprises one or more compounds selected from the group consisting of:
and
wherein the content of the first and second substances,
R7and R8The same or different, each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms.
7. A liquid crystal composition having negative dielectric anisotropy comprising the liquid crystal composition according to any one of claims 1 to 6, characterized in that the liquid crystal composition further comprises one or more additives.
8. A liquid crystal display comprising the liquid crystal composition according to any one of claims 1 to 6.
9. A liquid crystal display comprising the liquid crystal composition having negative dielectric anisotropy according to claim 7.
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| JP2009149667A (en) * | 1998-06-02 | 2009-07-09 | Chisso Corp | ALKENYL COMPOUND HAVING NEGATIVE DeltaepsilonVALUE, LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY DEVICE |
| DE19927627A1 (en) * | 1998-06-30 | 2000-01-05 | Merck Patent Gmbh | Liquid crystal medium used as dielectric in electrically controlled birefringence active matrix electro-optical display |
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| 侧向氟取代负介电各向异性液晶;李耀华;《山东化工》;20021230(第06期);第21-24页 * |
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Address after: 2/F, Sino Japan Cooperation Innovation Park, No. 16 Zidan Road, Qinhuai District, Nanjing, Jiangsu Province, 210014 Patentee after: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. Address before: 212212 East Side of Yangzhong Yangtze River Bridge, Zhenjiang City, Jiangsu Province Patentee before: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. |