CN116814277A - High-gradient high-brightness negative dielectric anisotropy liquid crystal composition and application thereof - Google Patents
High-gradient high-brightness negative dielectric anisotropy liquid crystal composition and application thereof Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 171
- 239000000203 mixture Substances 0.000 title claims abstract description 119
- 150000001875 compounds Chemical class 0.000 claims abstract description 47
- 229910052760 oxygen Inorganic materials 0.000 claims description 28
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 21
- 229910052740 iodine Inorganic materials 0.000 claims description 18
- 125000003545 alkoxy group Chemical group 0.000 claims description 16
- 125000000217 alkyl group Chemical group 0.000 claims description 16
- 125000001424 substituent group Chemical group 0.000 claims description 16
- 229910052717 sulfur Inorganic materials 0.000 claims description 16
- 125000003342 alkenyl group Chemical group 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 150000001336 alkenes Chemical class 0.000 claims description 7
- 125000003302 alkenyloxy group Chemical group 0.000 claims description 7
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 6
- RGOVYLWUIBMPGK-UHFFFAOYSA-N nonivamide Chemical compound CCCCCCCCC(=O)NCC1=CC=C(O)C(OC)=C1 RGOVYLWUIBMPGK-UHFFFAOYSA-N 0.000 claims description 4
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 claims description 4
- 101001053401 Arabidopsis thaliana Acid beta-fructofuranosidase 3, vacuolar Proteins 0.000 claims description 2
- 101001053395 Arabidopsis thaliana Acid beta-fructofuranosidase 4, vacuolar Proteins 0.000 claims description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 7
- 230000006750 UV protection Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 33
- 238000005516 engineering process Methods 0.000 description 8
- 238000002834 transmittance Methods 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 1
- 206010047571 Visual impairment Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 239000002216 antistatic agent Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000004224 protection Effects 0.000 description 1
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- 230000008707 rearrangement Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/46—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing esters
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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Abstract
The invention discloses a high-steepness high-brightness negative dielectric anisotropy liquid crystal composition and application thereof in a liquid crystal display, and belongs to the technical field of liquid crystal materials. The liquid crystal composition comprises liquid crystal compounds shown in general formulas I to VI:I、II、III、IV、V、
Description
Technical Field
The invention relates to a liquid crystal composition and application thereof, in particular to a high-gradient high-brightness negative dielectric anisotropy liquid crystal composition and application thereof in a liquid crystal display, and belongs to the technical field of liquid crystal materials.
Background
The liquid crystal display technology has been widely used in various sizes of display in the current society. Small-sized displays such as calculators, cell phones, meters, etc.; medium-sized displays such as computer displays; large-sized displays such as televisions. The liquid crystal display has the advantages of high resolution, high brightness, flat panel display and the like, and has light weight, low energy consumption and even flexible display. Therefore, liquid crystals will continue to play an important role in the information technology age.
The early liquid crystal display mode is TN display, people use TN electro-optic effect and integrated circuit to combine, and make it into liquid crystal display device (TN-LCD), has opened up wide prospect for the application of liquid crystal. TN-LCD has been gradually developed in large-scale industrial production, STN-LCD and TFT-LCD technologies are gradually matured, display mode types are gradually increased, and liquid crystal media with negative dielectric anisotropy such as ECB, DAP, VAN, MVA, ASV, PVA and the like appear.
In comparison with the conventional display modes, some liquid-crystalline media having negative dielectric anisotropy have been developed, such as ECB (electrically controlled birefringence) and its derivative modes DAP (deformation of alignment phase), VAN (vertically aligned nematic phase), MVA (multi-domain vertical alignment), ASV (advanced super viewing angle), PVA (mode vertical alignment). Contrast is very dependent for TN type displays. In addition, VA displays are known to have a wide viewing angle. The LC layer of VA displays comprises a liquid crystal medium with negative dielectric anisotropy sandwiched between two transparent electrodes. In the off state the LC layer molecules are aligned perpendicular to the electrode surface, with a pretilt angle, and when a voltage is applied across the electrode the LC molecules rearrange parallel to the electrode surface. VA displays have a wider viewing angle than ECB displays independent of contrast.
Too long a response time for the early exploration of the liquid crystal, the viscosity needs to be improved. This is affected by the rotational viscosity γ1, especially at low temperatures. The decrease in flow viscosity v 20 results in a very short corresponding time for vertically aligned edge aligned liquid crystals (e.g., ECB and VAN displays).
Currently, the popular Wide viewing angle technologies mainly include tn+wide Film, VA, including PVA, MVA, PSVA, IPS, FFS. Because the vertically oriented liquid crystal display has high contrast, quick response and other excellent performances, the VA type liquid crystal panel has wider application in the current display products, and 16.7M color and large visual angle are the most obvious technical characteristics.
There are various display modes in the market at present, and the display modes with competitive display modes mainly include in-plane switching (IPS), fringe-field switching (FFS), vertical alignment (vertical alignment, VA) and the like. In these display modes, both in-plane switching (IPS) and Fringe Field Switching (FFS) have the characteristic of wide viewing angle. A fast response can be obtained when the positive liquid crystal is used in the IPS/FFS display mode, and good reliability is achieved; while a higher transmittance can be obtained when the negative liquid crystal is used in the IPS/FFS display mode, the response speed is slow because the viscosity of the negative liquid crystal is relatively high.
Aiming at the difference of light transmittance of positive liquid crystal and negative liquid crystal in the two modes of in-plane switching (IPS) and fringe-field switching (FFS) of the current wide-view display mode, the difference is mainly reflected in the transmittance efficiency of the liquid crystal in the center of a pixel electrode interval. Because, in the center of the pixel electrode interval, the elastic force of the positive liquid crystal molecules is weaker than that of the negative liquid crystal molecules. If positive liquid crystals are to achieve the same light utilization efficiency, the Δnd value is greater than that of negative liquid crystals. Therefore, for the above two modes, in order to improve the transmittance of the positive liquid crystal, an early solution was to add a negative component to the positive liquid crystal, thereby enhancing the molecular rotation ability and improving the transmittance.
IPS (in-plane switching) displays are also popular, which comprise an LC layer between two substrates, two electrodes being arranged on one of the substrates, staggered with respect to each other, in a comb structure. When a voltage is applied across the electrodes, an electric field is generated between the LC layers parallel thereto, causing the LC molecules to rearrange.
The IPS display technology does not orient the liquid crystal molecules into a light-transmitting mode in advance, but into a light-opaque mode, the amount of light transmission is determined by an electrode perpendicular to the orientation direction of the liquid crystal molecules, and the higher the voltage is, the more molecules are twisted, so that accurate control of light is realized. It controls only one deflection angle of the IPS liquid crystal panel, and the number of deflection molecules can be approximately in direct proportion to the voltage, thereby making the hierarchical control of the panel easier to realize.
Compared with the traditional soft screen liquid crystal, the IPS hard screen has a stable liquid crystal molecular arrangement structure, has higher response speed, has super strong expressive force on the dynamic definition, completely eliminates the phenomena of blurring and water wave diffusion when the soft screen liquid crystal display screen is subjected to external pressure and shaking, and more eliminates the afterimage and tailing when the fast-speed picture is played, so that the IPS hard screen is adopted for industries such as aerospace, automobiles, subways and the like which are in motion state at any moment except the consumption, medical treatment and industrial control industries, and the image quality without any loss is obtained. It is expected that IPS display technology is increasingly used in various fields.
For IPS display technology, new liquid-crystalline media with improved properties are needed. For the application field of dynamic display, the corresponding time needs to be improved, the driving voltage needs to be reduced, and the working temperature range needs to be improved when the dynamic display is applied to the special field. Therefore, low rotational viscosity, large dielectric anisotropy, high clearing point, large K value are required. Preferably, the dielectric should be higher than 4, very preferably higher than 5, then preferably not higher than 12, in particular not higher than 15, since this is detrimental to reasonably high resistivity and has an effect on the quality reliability of the liquid crystal material.
Liquid crystal compositions suitable for LCDs and in particular for IPS displays are known, for example, from the following documents: EP0667555, DE19509410, DE19528106, JP07-181439 (A), WO9623851, etc. However, these compositions have significant drawbacks. Among other drawbacks, they mostly lead to disadvantageous long response times, have too low resistivity values, and/or require too high operating voltages.
Later, FFS (fringe-field switching) displays were proposed, which also contained two electrodes on the same substrate, only one electrode being arranged in a comb structure and the other electrode being unstructured, in contrast to IPS displays. A strong fringe field is thus formed, the electric field being adjacent to the electrode edges, penetrating the layer structure, which is strongly divided in both the horizontal and vertical directions. The viewing angle of IPS versus FFS displays is very low in dependence on contrast.
The current VA display type arrangement of LC molecules limits many relatively small areas in the LC layer. Rotation shift, such as tilting, may occur in these fields. VA displays with tilt domains have a wider viewing angle than conventional VA displays, independent of contrast and gray scale. This type of VA shows that the rearrangement of molecules in the on-state can be more easily achieved and therefore no rubbing of the cell is required anymore and the orientation of the pretilt angle can be controlled by the special design of the electrodes.
MVA (multidomain vertical alignment) is shown in a manner that causes a local tilt by means of an electrode with protrusions. LC molecules are arranged in parallel with the electrode surface in different areas in different directions after voltage is applied, so that spin transfer is prevented. Although this arrangement improves the viewing angle of the display, light transmission is reduced. With further development of MVA, only one side electrode is provided with a protrusion, while the other side electrode is provided with a slit, which is beneficial for light transmission. The slit electrode forms an uneven electric field after voltage is applied, and the switching state can still be controlled. In order to further increase the light transmittance, the separation slit and the protrusion may be increased, but this may lead to an increase in response time. The protrusions on the electrodes are completely redundant in PVA display, the electrodes are structured by slits, which increases contrast and improves light transmittance, but this technique is very difficult and the display is more sensitive to mechanical external influences. For many application fields, such as displays, television screens, short response times, high contrast, brightness of the display are required.
PSA shows that the liquid crystal medium comprises a liquid crystal phase and a small dose of polymeric compound, the mass ratio of which is 0.2-0.4%. After filling the liquid crystal medium into the display cell, the polymeric compound is polymerized and crosslinked by UV polymerization, and display is performed by applying a voltage to the electrodes. The added polymer monomer is commonly referred to as a reactive monomer or "RM" (Reactive Mesogens).
PSA mode is widely used for a variety of conventional liquid crystal type displays. For example: PS-VA (polymer sustained vertically alignment), PS-OCB (optically compensated bend), PS-IPS (in-plane switching), PS-FFS (fringe-field switching), PS-TN (twisted nematic), the polymerization of the polymeric compound occurs under power on in the PSA-VA and PSA-OCB displays, and the polymerization occurs without power on in the PSA-IPS displays. The PSA mode can form a pretilt angle and PSA-OCB shows that the bending structure is very stable without the need for applying a compensation voltage. PSA-VA shows that pretilt angle has a positive effect on response time.
The optical characteristics of the liquid crystal change reversibly before and after the voltage is applied as a dielectric. Liquid crystal displays use a variety of electro-optic effects. Special liquid crystal media are required for new VA displays. Such as liquid crystalline media with negative dielectric anisotropy, need to have a high VHR after UV exposure. LC phases for electro-optic displays are required to meet a number of requirements. Of particular importance are chemical and physical stability to moisture, air, such as thermal stability, resistance to infrared radiation, the visible and ultraviolet light region, and direct or alternating electric fields. Further, the industrial application of the liquid crystal phase requires a suitable temperature range and has a low viscosity.
Liquid crystal materials are rod-like organic compounds having both fluidity of liquid and anisotropy of crystal at a certain temperature, and their inherent optical (refractive index) anisotropy (Δn) and dielectric anisotropy (Δε) characteristics are key photoelectric materials for producing display devices. None of the liquid crystal compounds to date meets all of the requirements. Generally a mixture of 2 to 25 monomer compounds, more preferably 3 to 18 compounds, may be used as the liquid crystal phase.
In the prior art, various liquid crystal compounds have been synthesized, but a single liquid crystal compound cannot meet the performance parameters required for various liquid crystal devices such as a wide operating temperature, a large dielectric anisotropy, a low rotational viscosity, and a suitable refractive index anisotropy. Therefore, the liquid crystal materials used as the liquid crystal medium are all liquid crystal compositions. From the standpoint of the preparation of liquid crystal compositions, these requirements are met by using liquid crystal compounds of different nature, since the properties of the materials are somewhat mutually restricted, such as the use of low viscosity values which allow such short response times, but generally at the same time reduce the clearing point; increasing the dielectric anisotropy increases the rotational viscosity, increases the working temperature, and makes it difficult to achieve low temperature performance. There is a continuing need to develop new products if liquid crystal compositions are formed that function well. Therefore, it is necessary to provide a liquid crystal composition to solve the problems of high transmittance, high definition bright point, proper birefringence anisotropy, high dielectric anisotropy, excellent stability, high VHR and resistivity, low rotational viscosity, and fast response speed performance required for practical applications.
In the prior art, although there are extremely large liquid crystal compositions with negative dielectric anisotropy, the characteristics of high steepness, high brightness and fast response cannot be simultaneously considered, for example: the compound provided in the Chinese patent of the invention (the preparation method and application thereof) (application number: 201810100746.8) has a very large absolute value of negative dielectric anisotropy, but with the continuous progress of technology, the gradient, response speed, power consumption and other aspects of the compound cannot completely meet the market demands.
Disclosure of Invention
To solve the disadvantages of the prior art, the present invention aims to provide a liquid crystal composition having negative dielectric anisotropy, clearing point > 70 ℃, good steepness, high brightness and contrast based on polar compounds, a display using the liquid crystal composition having a short response time at extremely high or extremely low temperature, and improved stability, especially no image sticking phenomenon over a long period of operation.
In order to achieve the above object, the present invention adopts the following technical scheme:
a high-steepness high-brightness negative dielectric anisotropy liquid crystal composition comprising:
1 to 70 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in the general formula I:
I
1 to 40 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in a general formula II:
II
1 to 50 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in a general formula III:
III
1 to 60 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in a general formula IV:
IV
1 to 60 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in the general formula V:
V
1 to 10 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in a general formula VI:
VI
wherein R is 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 、R 8 、R 9 、R 10 、R 11 、R 12 Each independently selected from the group consisting of C1-C15 substituted or unsubstituted straight or branched alkyl, alkoxy or ether oxy, C2-C15 substituted or unsubstituted straight or branched alkenyl or alkenyl oxy, C3-C5 substituted or unsubstituted cycloalkyl wherein the substituents are selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-;
ring A, B, C, D, E, F, G, I, J, K, M is each independently selected from the group consisting of cyclohexyl, phenylene, phenyl, oxy-hexacyclic, substituted phenylene, wherein the substituents are selected from F, cl, br, I, CN;
L 1 、L 2 、L 3 、L 4 、L 5 、L 6 each independently selected from H, F, S, CN, cl, br, I, C C3 alkyl or alkoxy, CF 3 、CF 3 O；
m, n, p, q are each independently selected from 0, 1;
Z 1 、Z 2 each independently selected from-C.ident.C-, -CH=CH-, -cf=cf-, -COO-, -OCO-, -OOC-, -CF 2 O-、-CH 2 O-。
Preferably, the liquid crystal compound of formula I is selected from the following compounds:
Ⅰ-1
Ⅰ-2
Ⅰ-3
Ⅰ-4
wherein R is 1 、R 2 Each independently selected from C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxygen, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkene oxygen, substituent selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
Preferably, the liquid crystal compound represented by formula II is selected from the following compounds:
Ⅱ-1
Ⅱ-2
Ⅱ-3
Ⅱ-4
Ⅱ-5
Ⅱ-6
Ⅱ-7
wherein R is 11 、R 12 Each independently selected from C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxygen, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkene oxygen, substituent selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
Preferably, the liquid crystal compound represented by formula III is selected from the following compounds:
Ⅲ-1
Ⅲ-2
Ⅲ-3
Ⅲ-4
Ⅲ-5
Ⅲ-6
Ⅲ-7
Ⅲ-8
Ⅲ-9
wherein R is 3 、R 4 Each of which is a single pieceIndependently selected from C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxygen, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkene oxygen, the substituent is selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
Preferably, the liquid crystal compound represented by formula IV is selected from the following compounds:
IV-1
IV-2
IV-3
IV-4
IV-5
IV-6
IV-7
IV-8
IV-9
wherein R is 5 、R 6 Each independently selected from the group consisting of C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxy, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkenyloxy,the substituents are selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
Preferably, the liquid crystal compound represented by formula V is selected from the following compounds:
V-1
V-2
V-3
V-4
V-5
V-6
V-7
V-8
V-9
V-10
V-11
V-12
V-13
V-14
V-15
V-16
V-17
V-18
V-19
V-20
wherein R is 7 、R 8 Each independently selected from the group consisting of C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxy, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkenyl oxy, C3-C5 substituted or unsubstituted cycloalkyl, wherein the substituents are selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
Preferably, the liquid crystal compound of formula VI is selected from the following compounds:
VI-1
VI-2
VI-3
VI-4
VI-5
wherein R is 9 、R 10 Each independently selected from the group consisting of C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxy, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkenyl oxy, C3-C5 substituted or unsubstituted cycloalkyl, wherein the substituents are selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
A liquid crystal display device comprising the high steepness high brightness negative dielectric anisotropy liquid crystal composition of any one of the preceding claims and applied in VA, MVA, PVA, FFS, PSVA, IPS and TFT display modes.
The invention has the advantages that:
(1) The liquid crystal composition provided by the invention has extremely low threshold voltage, extremely large negative dielectric anisotropy absolute value, high steepness, high brightness, good stability and low-temperature intersolubility, higher clearing point, wider nematic phase temperature range, shorter response time, high VHR and resistivity and good UV resistance, and is mainly applied to VA, MVA, PSA, IPS, FFS, TFT and other display modes;
(2) The liquid crystal composition provided by the invention has a nematic phase temperature range: -40-120 ℃. Storing at-40deg.C, -30deg.C, and-20deg.C for more than 1 month respectively. Normal display at high temperature, no bad display phenomenon below 10 ℃ of clear point;
(3) The liquid crystal composition provided by the invention has the following excellent parameters: the flow viscosity (measured by a rotary rotor viscometer) v20 is less than or equal to 100 mPas at 20 ℃, the rotational viscosity (measured by an INSTEC physical property tester of INSTEC (China constant Co.) in the United states) at 20 ℃ is less than or equal to 300 mPas, the model ALCT-PP 1) gamma 1 is within the range of 0.075-0.2, the dielectric anisotropy delta epsilon is within the range of-2 to-10, the threshold voltage is within the range of 1.5-3.2V (extremely low), and the VHR before and after UV is high.
Detailed Description
The liquid crystal composition provided by the invention is prepared by adopting a traditional method, namely: mixing two or more compounds at a suitable temperature; alternatively, each component is dissolved in an organic solvent (such as acetone, chloroform, methanol, etc.), and then the solvent is removed by distillation.
The liquid crystal composition provided by the invention also needs to be added with proper additives such as an ultraviolet resistant agent, an antistatic agent, an antioxidant, a defoaming agent and the like.
The present invention will be specifically described with reference to the following specific examples.
The components used in the following examples were obtained by conventional methods.
The liquid crystal compositions in the following examples were prepared by conventional methods.
The liquid crystal composition in the following examples was tested for various performance parameters by conventional methods, and a liquid crystal display material comprising upper and lower glass substrates carrying transparent electrodes and a liquid crystal medium sandwiched therebetween.
The percentages in the examples represent weight percentages unless otherwise indicated.
Cp (. Degree. C.) represents the clearing point.
Δn represents optical anisotropy at 20℃and 589nm.
Delta epsilon represents the dielectric anisotropy at 25 ℃.
γ1 (mPas) represents the rotational viscosity at 20 ℃.
Vo (V) represents a threshold voltage at 20 ℃.
a (%) represents (V) 1 -V 0 ）/V 0 *100%，V 1 (V) represents the saturation voltage at 20 ℃, the more a valueThe smaller the steepness the higher.
CR represents contrast, the larger the CR value, the better the contrast.
Example 1
TABLE 1 composition of liquid crystal composition E1 and results of performance parameter test
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Example 2
TABLE 2 composition of liquid crystal composition E2 and results of performance parameter test
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Example 3
TABLE 3 composition of liquid crystal composition E3 and results of performance parameter test
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Example 4
TABLE 4 composition of liquid crystal composition E4 and results of performance parameter tests
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Example 5
TABLE 5 composition of liquid crystal composition E5 and results of performance parameter test
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Example 6
TABLE 6 composition of liquid crystal composition E6 and results of performance parameter test
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Example 7
TABLE 7 composition of liquid crystal composition E7 and results of performance parameter test
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Example 8
TABLE 8 composition of liquid crystal composition E8 and results of performance parameter test
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Example 9
TABLE 9 composition of liquid crystal composition E9 and results of performance parameter test
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Example 10
TABLE 10 composition of liquid crystal composition E10 and results of performance parameter test
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Example 11
TABLE 11 composition of liquid crystal composition E11 and results of performance parameter test
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Example 12
TABLE 12 composition of liquid crystal composition E12 and results of performance parameter test
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Example 13
TABLE 13 composition of liquid Crystal composition E13 and results of Performance parameter test
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Example 14
TABLE 14 composition of liquid Crystal composition E14 and results of Performance parameter test
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Example 15
TABLE 15 composition of liquid Crystal composition E15 and results of Performance parameter test
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Example 16
TABLE 16 composition of liquid crystal composition E16 and results of performance parameter test
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Example 17
TABLE 17 composition of liquid crystal composition E17 and results of performance parameter test
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Example 18
TABLE 18 composition of liquid crystal composition E18 and results of performance parameter test
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Example 19
TABLE 19 composition of liquid crystal composition E19 and results of performance parameter test
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Example 20
TABLE 20 composition of liquid crystal composition E20 and results of performance parameter test
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Example 21
TABLE 21 composition of liquid crystal composition E21 and results of performance parameter test
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Example 22
TABLE 22 composition of liquid crystal composition E22 and results of performance parameter test
Example 23
TABLE 23 composition of liquid crystal composition E23 and results of performance parameter test
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Example 24
TABLE 24 composition of liquid crystal composition E24 and results of performance parameter test
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Example 25
TABLE 25 composition of liquid crystal composition E25 and results of performance parameter test
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Example 26
TABLE 26 composition of liquid crystal composition E26 and results of performance parameter test
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Example 27
TABLE 27 composition of liquid crystal composition E27 and results of Performance parameter test
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Example 28
TABLE 28 composition of liquid Crystal composition E28 and results of Performance parameter testing
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Example 29
TABLE 29 composition of liquid crystal composition E29 and results of performance parameter test
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Example 30
TABLE 30 composition of liquid crystal composition E30 and results of performance parameter test
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As can be seen from the data in tables 1 to 30: the larger the content of the I and II compounds, the smaller the gamma 1 and a values, the higher the steepness and the lower the rotational viscosity, and the liquid crystal display device is more suitable for VA type liquid crystal display with high driving path number.
Comparative example 1
TABLE 31 composition of liquid crystal composition M1 and results of performance parameter test
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Comparing the liquid crystal composition (liquid crystal composition E11) provided by the present invention with the conventional liquid crystal composition (liquid crystal composition M1), it can be seen that: at Cp, deltan, V 0 In the case of the approach of Δε, the liquid crystal composition E11 has lower rotational viscosity, higher steepness and contrast.
Filling the liquid crystal composition E11 and the liquid crystal composition M1 into a VA liquid crystal test box of the same type under the same condition, and simultaneously testing the power consumption after UV for 6min and the high-temperature power consumption at 90 ℃ to obtain the following data:
by comparing the data in the above table, it can be seen that: the post-UV power consumption and the high-temperature power consumption of the liquid crystal composition E11 are obviously improved compared with those of the liquid crystal composition M1.
In summary, the liquid crystal composition provided by the invention has a suitable absolute value of negative dielectric anisotropy, a higher clear point, a suitable optical anisotropy, a high steepness and a high contrast, a wider nematic temperature range, and low viscosity, low power consumption and a fast response speed, and can be used in a display mode such as VA, MVA, PVA, PSVA, IPS, FFS, TFT.
It should be noted that, the above embodiments are not intended to limit the present invention in any way, and all the technical solutions obtained by adopting equivalent substitution or equivalent transformation fall within the protection scope of the present invention.
Claims (9)
1. A high-steepness high-brightness negative dielectric anisotropy liquid crystal composition, characterized in that the liquid crystal composition comprises:
1 to 70 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in the general formula I:
I
1 to 40 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in a general formula II:
II
1 to 50 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in a general formula III:
III
1 to 60 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in a general formula IV:
IV
1 to 60 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in the general formula V:
V
1 to 10 percent of the total mass of the liquid crystal composition of one or more liquid crystal compounds shown in a general formula VI:
VI
wherein R is 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 、R 8 、R 9 、R 10 、R 11 、R 12 Each independently selected from the group consisting of C1-C15 substituted or unsubstituted straight or branched alkyl, alkoxy or ether oxy, C2-C15 substituted or unsubstituted straight or branched alkenyl or alkenyl oxy, C3-C5 substituted or unsubstituted cycloalkyl wherein the substituents are selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-;
ring A, B, C, D, E, F, G, I, J, K, M is each independently selected from the group consisting of cyclohexyl, phenylene, phenyl, oxy-hexacyclic, substituted phenylene, wherein the substituents are selected from F, cl, br, I, CN;
L 1 、L 2 、L 3 、L 4 、L 5 、L 6 each independently selected from H, F, S, CN, cl, br, I, C C3 alkyl or alkoxy, CF 3 、CF 3 O；
m, n, p, q are each independently selected from 0, 1;
Z 1 、Z 2 each independently selected from-C.ident.C-, -CH=CH-, -cf=cf-, -COO-, -OCO-, -OOC-, -CF 2 O-、-CH 2 O-。
2. The high-steepness high-brightness negative dielectric anisotropy liquid crystal composition according to claim 1, wherein the liquid crystal compound represented by the general formula i is selected from the group consisting of:
Ⅰ-1
Ⅰ-2
Ⅰ-3
Ⅰ-4
wherein R is 1 、R 2 Each independently selected from C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxygen, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkene oxygen, substituent selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
3. The high-steepness high-brightness negative dielectric anisotropy liquid crystal composition according to claim 1, wherein the liquid crystal compound represented by the general formula ii is selected from the following compounds:
Ⅱ-1
Ⅱ-2
Ⅱ-3
Ⅱ-4
Ⅱ-5
Ⅱ-6
Ⅱ-7
wherein R is 11 、R 12 Each independently selected from C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxygen, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkene oxygen, substituent selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
4. The high-steepness high-brightness negative dielectric anisotropy liquid crystal composition according to claim 1, wherein the liquid crystal compound represented by the general formula III is selected from the following compounds:
Ⅲ-1
Ⅲ-2
Ⅲ-3
Ⅲ-4
Ⅲ-5
Ⅲ-6
Ⅲ-7
Ⅲ-8
Ⅲ-9
wherein R is 3 、R 4 Each independently selected from C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxygen, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkene oxygen, substituent selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
5. The high-steepness high-brightness negative dielectric anisotropy liquid crystal composition according to claim 1, wherein the liquid crystal compound represented by the general formula IV is selected from the following compounds:
IV-1
IV-2
IV-3
IV-4
IV-5
IV-6
IV-7
IV-8
IV-9
wherein R is 5 、R 6 Each independently selected from C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxygen, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkene oxygen, substituent selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
6. The high-steepness high-brightness negative dielectric anisotropy liquid crystal composition according to claim 1, wherein the liquid crystal compound represented by the general formula V is selected from the following compounds:
V-1
V-2
V-3
V-4
V-5
V-6
V-7
V-8
V-9
V-10
V-11
V-12
V-13
V-14
V-15
V-16
V-17
V-18
V-19
V-20
wherein R is 7 、R 8 Each independently selected from the group consisting of C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxy, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkenyl oxy, C3-C5 substituted or unsubstituted cycloalkyl, wherein the substituents are selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
7. The high-steepness high-brightness negative dielectric anisotropy liquid crystal composition according to claim 1, wherein the liquid crystal compound represented by the general formula VI is selected from the following compounds:
VI-1
VI-2
VI-3
VI-4
VI-5
wherein R is 9 、R 10 Each independently selected from the group consisting of C1-C15 substituted or unsubstituted straight or branched chain alkyl, alkoxy or ether oxy, C2-C15 substituted or unsubstituted straight or branched chain alkenyl or alkenyl oxy, C3-C5 substituted or unsubstituted cycloalkyl, wherein the substituents are selected from F, cl, br, I, O, S, CN, OH, -CH=CH-, C≡C-.
8. A liquid crystal display device comprising the high-steepness high-luminance negative dielectric anisotropy liquid crystal composition according to any one of claims 1 to 7.
9. Use of the liquid crystal display device of claim 8 in VA, MVA, PVA, FFS, PSVA, IPS and TFT display modes.
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