CN109207163A - A kind of liquid-crystal composition and its application - Google Patents
A kind of liquid-crystal composition and its application Download PDFInfo
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- CN109207163A CN109207163A CN201710522147.0A CN201710522147A CN109207163A CN 109207163 A CN109207163 A CN 109207163A CN 201710522147 A CN201710522147 A CN 201710522147A CN 109207163 A CN109207163 A CN 109207163A
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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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- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13706—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering the liquid crystal having positive dielectric anisotropy
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Abstract
The invention discloses a kind of liquid-crystal composition and its application, the liquid-crystal composition includes: the compound of at least one general formula I and the compound of at least one general formula II.Liquid-crystal composition provided by the invention has suitable optical anisotropy, high clearing point and elastic constant K11And K33, also there is relatively low dielectric anisotropy, when the liquid-crystal composition is applied in liquid crystal display, power consumption can be reduced, reduce the response time, increase contrast.
Description
Technical field
The present invention relates to liquid crystal material fields, and in particular to a kind of liquid-crystal composition and its application.
Background technique
Liquid crystal display (Liquid Crystal Display, LCD) is because its is small in size, light-weight, low in energy consumption and shows
Good quality and developed rapidly, be especially widely applied in portable electronic information product.With for just
Take formula computer, office application, Video Applications LCD screen size increase, liquid crystal display can be used in large screen display
And finally instead of the display of cathode-ray tube (Cathode Ray Tube, CRT).
According to the type of display pattern be divided into PC (phase change, phase transformation), TN (twist nematic, distort to
Column), STN (super twisted nematic, super twisted nematic), ECB (electrically controlled
Birefringence, electrically conerolled birefringence), OCB (optically compensated bend, optical compensation curved), IPS
The types such as (in-plane switching, coplanar transformation), VA (vertical alignment, vertical orientation).
Liquid crystal material must have good low temperature intersolubility and thermal stability.In addition, liquid crystal material should have low glue
Degree and short response time, low threshold voltage and high contrast.In order to obtain the liquid crystal display element with superperformance, and improve
The performance indexes of liquid-crystal composition, it is a kind of accordingly that a kind of performance of liquid-crystal composition is corresponded to liquid crystal display element by us
The association of performance, is summarized in following table 1.The properties of composition are further illustrated according to commercially available liquid crystal display element
Index.Nematic temperature range is associated with the operating temperature range of element.Nematic ceiling temperature is preferably greater than
Equal to 70 DEG C, and nematic lower limit temperature is preferably less than equal to -10 DEG C.When the response of the viscosity of composition and element
Between be associated.In order to show animation in the component, the response time of preferably element is short.Therefore, preferably composition
Viscosity is small, and the viscosity of composition is small when preferably temperature is low.
The general characteristic of table 1. composition and liquid crystal display element
| NO. | The general characteristic of composition | The general characteristic of liquid crystal display element |
| 1 | Nematic wide temperature range | Workable wide temperature range |
| 2 | Viscosity is small | Response time is short |
| 3 | Optical anisotropy is appropriate | Contrast is big |
| 4 | Positive or negative property dielectric constant anisotropy is big | Critical voltage is low, and consumption electric power is small, and contrast is big |
| 5 | Resistivity is big | Voltage retention is big, and contrast is big |
| 6 | To ultraviolet light and thermostabilization | Service life is long |
The optical anisotropy of composition and the contrast of element are associated.In order to make the contrast of liquid crystal display element most
Bigization, can (Δ n) and the product value (Δ n*d) of the thickness (d) of liquid crystal layer be set as by the optical anisotropy of liquid-crystal composition
The mode of fixed value is designed.Product value appropriate depends on the type of operating mode.Such as the appropriate value of the element of TN mode
About 0.45 μm.When the situation, for element lesser for thickness of liquid crystal layer, the preferably big combination of optical anisotropy
Object.
The absolute value of the big dielectric anisotropy of composition helps that element is made to have low critical voltage, small consumption
Power and big contrast.Therefore, the absolute value of preferably big dielectric anisotropy.The resistivity of composition facilitates greatly
Make element that there is big voltage retention and big contrast.Therefore, it is preferably not only at room temperature, simultaneously in the initial stage
And at high temperature also with the composition of larger resistivity.Preferably not only at room temperature but also in height after long-time use
Also with the composition of larger resistivity under temperature.Composition has the stability of ultraviolet light and heat and the service life of liquid crystal display element
It closes.When aforementioned stable is high, the service life of the element is long.Such characteristic is for used in liquid crystal projection apparatus, LCD TV etc.
It is preferable for liquid crystal display element.
Comparatively ideal liquid crystal display element is that have that workable wide temperature range, response time are short, contrast is big, critical
The characteristics such as voltage is low, voltage retention is big, the service life is long, preferably the response time is even shorter than 1 millisecond.Therefore, composition
Characteristic preferably nematic ceiling temperature is high, nematic lower limit temperature is low, viscosity is small, optical anisotropy is big,
The absolute value of dielectric anisotropy is big, resistivity is big, stability height to heat high to the stability of ultraviolet light etc..
Summary of the invention
Goal of the invention: in view of the drawbacks of the prior art, it is an object of the invention to by the way that one or more positive dielectrics are each
The liquid crystal monomer of anisotropy is entrained in the liquid-crystal composition of negative dielectric anisotropic, to provide a kind of optical anisotropy
Greatly, the absolute value of dielectric anisotropy it is big, with wide nematic phase, the liquid crystal group that low temperature storage stability is high and contrast is high
Close object, and the liquid crystal display element comprising the liquid-crystal composition.
Technical solution of the present invention:
One aspect of the present invention provides a kind of liquid-crystal composition, includes:
The compound of at least one general formula I
The compound of at least one general formula II
Wherein,
R1、R2And R3Expression-H independent ,-F, the alkyl containing 1-12 carbon atom or alkoxy contain 2-12
The alkenyl or alkenyloxy group ,-OR of carbon atom5OR6、The wherein alkyl or alkoxy and described
One or more H in alkenyl or alkenyloxy group can be replaced by F, and R1And R2In at least one be-OR5OR6；
R5And R6It is independent to indicate the alkyl containing 1-12 carbon atom or the alkenyl containing 2-12 carbon atom；
R4Expression-F ,-CF3、-OCF3, fluoro-alkyl containing 1-12 carbon atom or fluoroalkyl, contain 2-12
The fluoro alkenyl or fluoro alkenyloxy group of carbon atom；
Z1And Z2Expression singly-bound independent ,-COO- ,-OCO- ,-CH2O-、-OCH2Or-CH2CH2-；
Z3Indicate singly-bound ,-COO- ,-OCO- ,-CH2O-、-OCH2-、-CF2O-、-OCF2Or-CH2CH2-；
L1And L2Expression-F ,-Cl ,-CN or-NCS independent；
L3、L4And L5Expression-H ,-F or-CH independent3, and L3And L4It is not simultaneously F；
RingAnd ringExpression independentWherein,In
One or more-CH2It can be substituted by-O-,Middle one or more H can be optionally substituted by halogen；
RingIt indicatesWherein
Middle one or more-CH2It can be substituted by-O-, singly-bound can be substituted by double bond in one or more rings,In one or
Multiple H can be optionally substituted by halogen, and-CH=can be substituted by-N=in one or more rings；
N1 and n2 is independent to indicate 0,1,2 or 3, and when n1 is 2 or 3, ringCan be identical or different,
Z1It can be identical or different；When n2 is 2 or 3, ringCan be identical or different, Z2It can be identical or different；
M indicates 1,2,3 or 4, and when m is 2,3,4, ringCan be identical or different, Z3It can be identical or not
Together.
Preferably, the compound of the general formula I is selected from the group of following compound composition:
Wherein,
RingIt indicatesAnd when n1 is 1, ringIt indicates
When n1 is 2 or 3, at least one ringIt indicates
L6、L7、L8And L9Expression-H or-F independent；
O indicates 1 or 2；
P and q is independent to indicate 0 or 1.
It is further preferred that the compound of the general formula I -1 is selected from the group of following compound composition:
The compound of the general formula I -2 is selected from the group of following compound composition:
Wherein,
R11And R21Expression-H independent ,-F, the alkyl containing 1-7 carbon atom or alkoxy contain 2-7 carbon
The alkenyl or alkenyloxy group ,-OR of atom51OR61、The wherein alkyl or alkoxy and described
One or more H in alkenyl or alkenyloxy group can be replaced by F, and R11And R21In at least one be-OR51OR61；
R51And R61It is independent to indicate the alkyl containing 1-10 carbon atom or the alkenyl containing 2-10 carbon atom.
Further, the compound of the I -1-1 is selected from the group of following compound composition:
The compound of the I -1-2 is selected from the group of following compound composition:
The compound of the I -1-3 is selected from the group of following compound composition:
The compound of the I -1-4 is selected from the group of following compound composition:
The compound of the I -1-5 is selected from the group of following compound composition:
The compound of the I -1-6 is selected from the group of following compound composition:
The compound of the I -1-7 is selected from the group of following compound composition:
The compound of the I -1-8 is selected from the group of following compound composition:
The compound of the I -1-9 is selected from the group of following compound composition:
The compound of the I -1-10 is selected from the group of following compound composition:
The compound of the I -1-11 is selected from the group of following compound composition:
The compound of the I -1-12 is selected from the group of following compound composition:
The compound of the I -2-1 is selected from the group of following compound composition:
The compound of the I -2-2 is selected from the group of following compound composition:
The compound of the I -2-3 is selected from the group of following compound composition:
The compound of the I -2-4 is selected from the group of following compound composition:
The compound of the I -2-5 is selected from the group of following compound composition:
Preferably, the compound of the general formula II is selected from the group of following compound composition:
Wherein,
RingRingAnd ringExpression independent
M1 indicates 0,1 or 2.
It is further preferred that the compound of the general formula II -1 is selected from the group of following compound composition:
The compound of the general formula II -2 is selected from the group of following compound composition:
Wherein,
R31Expression-H ,-F, alkyl or alkoxy, alkenyl or alkene oxygen containing 2-7 carbon atom containing 1-7 carbon atom
Base ,-OR5OR6, wherein one or more H in the alkyl or alkoxy and the alkenyl or alkenyloxy group can be replaced by F；
R41Expression-F ,-CF3、-OCF3, fluoro-alkyl containing 1-7 carbon atom or fluoroalkyl, contain 2-7 carbon
The fluoro alkenyl or fluoro alkenyloxy group of atom.
Still further preferably, the R31Expression-H, the alkyl containing 1-5 carbon atom or alkoxy contain 2-5 carbon
The alkenyl or alkenyloxy group of atom；R41Expression-F ,-CF3、-OCF3。
Further, the liquid-crystal composition further includes the compound of at least one general formula III:
Wherein,
R7And R8It is independent to indicate H, the alkyl containing 1-12 carbon atom or alkoxy, contain 2-12 carbon atom
Alkenyl or alkenyloxy group；
RingAnd ringExpression independent
R indicates 1,2 or 3.
Preferably, the compound of the general formula III is selected from the group of following compound composition:
Wherein, R71And R81It is independent to indicate H, the alkyl containing 1-7 carbon atom or alkoxy, contain 2-7 carbon
The alkenyl or alkenyloxy group of atom.
In some embodiments of the present invention, it is preferred that the compound of the general formula III -1 is selected from by following compound
The group of composition:
The compound of the general formula III -2 is selected from the group being made of following compound:
The compound of the general formula III -3 is selected from the group being made of following compound:
The compound of the general formula III -4 is selected from the group being made of following compound:
The compound of the general formula III -5 is selected from the group being made of following compound:
The compound of the general formula III -6 is selected from the group being made of following compound:
The compound of the general formula III -7 is selected from the group being made of following compound:
The compound of the general formula III -8 is selected from the group being made of following compound:
The compound of the general formula III -9 is selected from the group being made of following compound:
The compound of the general formula III -10 is selected from the group being made of following compound:
The compound of the general formula III -11 is selected from the group being made of following compound:
The compound of the general formula III -12 is selected from the group being made of following compound:
In some embodiments of the present invention, the compound of the general formula I account for the liquid-crystal composition total weight 1~
80%, the compound of the general formula II accounts for the 1~85% of the liquid-crystal composition total weight, and the compound of the general formula III accounts for institute
State the 0~70% of liquid-crystal composition total weight.
Further, in some embodiments of the present invention, it is total to account for the liquid-crystal composition for the compound of the general formula I
The 20~40% of weight, the compound of the general formula II account for the 20~60% of the liquid-crystal composition total weight, the general formula III
Compound account for the 15~50% of the liquid-crystal composition total weight.
Another aspect of the present invention provides a kind of liquid-crystal composition, also comprising describing in known to those skilled in the art and document
One or more additives.For example, can be added the pleochroic dye for accounting for the 0-15% of the liquid-crystal composition total weight and/or
Chiral dopant.
The possibility dopant being added preferably in mixture according to the present invention is shown as follows.
In embodiments of the invention, the preferably described dopant accounts for the 0-5% of the liquid-crystal composition total weight；It is more excellent
Ground, the dopant account for the 0-1% of the liquid-crystal composition total weight.
The stabilizer that can be for example added in mixture according to the present invention is referred to as follows.
Preferably, the stabilizer is selected from stabilizer as follows.
In embodiments of the invention, the preferably described stabilizer accounts for the 0-5% of the liquid-crystal composition total weight；It is more excellent
Ground, the stabilizer account for the 0-1% of the liquid-crystal composition total weight；As particularly preferred scheme, the stabilizer accounts for described
The 0-0.1% of liquid-crystal composition total weight.
Another aspect of the present invention also provides a kind of liquid crystal display device comprising above-mentioned liquid-crystal composition.
The utility model has the advantages that
Liquid-crystal composition provided by the invention has suitable optical anisotropy, high clearing point and elastic constant K11
And K33, also there is relatively low dielectric anisotropy can reduce function when the liquid-crystal composition is applied in liquid crystal display
Consumption reduces the response time, increases contrast.
Specific embodiment
Illustrate the present invention below with reference to specific embodiment.It should be noted that the following examples are the present invention
Example, be only used to illustrate the present invention, and be not limited to the present invention.Without departing from the spirit or scope of the invention,
It can carry out other combinations and the various improvement in present inventive concept.
For convenient for expressing, in following embodiment, unit structure code listed by table 1 of liquid-crystal composition is indicated:
The group structure code of 1 liquid-crystal compounds of table
By taking the compound of following structural formula as an example:
The structural formula such as indicates by code listed in Table 1, then can be expressed as: nCCGF, and the n in code indicates the C of left end alkyl
Atomicity, such as n are " 3 ", that is, indicate that the alkyl is-C3H7；C in code represents cyclohexyl, and G represents the fluoro- Isosorbide-5-Nitrae of 2--Asia benzene
Base, F represent fluorine.
In following embodiment test item to write a Chinese character in simplified form code name as follows:
Cp (DEG C) clearing point (nematic-isotropic phase transition temperature)
Δ n optical anisotropy (589nm, 25 DEG C)
Δ ε dielectric anisotropy (1KHz, 25 DEG C)
V10 threshold voltage (under normal white mode, relative contrast be 10% character voltage)
T-30 DEG C of low-temperature storage time (at -30 DEG C)
K11Splay elastic constant
K33Bend elastic constant
Wherein,
Optical anisotropy uses abbe's refractometer under sodium lamp (589nm) light source, 25 DEG C of tests obtain；
Δ ε=ε||-ε⊥, wherein ε||For the dielectric constant for being parallel to molecular axis, ε⊥It is normal for the dielectric perpendicular to molecular axis
Number, test condition: 25 DEG C, 1KHz, testing cassete be TN90 type, box is 7 μm thick.
The test condition of V10: 4 μm of liquid crystal cells, DMS505 test, square-wave test.
K11、K33It is the C-V curve calculating gained that liquid crystal is tested using LCR instrument and anti-parallel friction box, test condition: 7 μ
M anti-parallel friction box, V=0.1~20V.
Each ingredient used by below in an example, the synthesis can be carried out by known methods, or passes through
Commercial sources obtain.These synthetic technologys be it is conventional, obtained each liquid-crystal compounds meets electrical type compound after tested
Standard.
The proportion of each liquid-crystal composition as defined according to the following examples, prepares liquid-crystal composition.The liquid-crystal composition
Preparation carry out according to conventional methods in the art, such as take heating, ultrasonic wave, suspension mode mixed according to regulation ratio
It closes and is made.
Prepare and research the liquid-crystal composition provided in the following example.Be shown below each liquid-crystal composition composition and
Its performance parameter test result.
Comparative example 1
It is configured to the liquid-crystal composition of comparative example 1 by each compound and weight percent listed in table 2, is filled in liquid
It is tested for the property between crystal display two substrates, test data is as shown in the table:
2 liquid crystal combination composition formula of table and its test performance
Embodiment 1
It is configured to the liquid-crystal composition of embodiment 1 by each compound and weight percent listed in table 3, is filled in liquid
It is tested for the property between crystal display two substrates, test data is as shown in the table:
3 liquid crystal combination composition formula of table and its test performance
Embodiment 2
It is configured to the liquid-crystal composition of embodiment 2 by each compound and weight percent listed in table 4, is filled in liquid
It is tested for the property between crystal display two substrates, test data is as shown in the table:
4 liquid crystal combination composition formula of table and its test performance
Embodiment 3
It is configured to the liquid-crystal composition of embodiment 3 by each compound and weight percent listed in table 5, is filled in liquid
It is tested for the property between crystal display two substrates, test data is as shown in the table:
5 liquid crystal combination composition formula of table and its test performance
Embodiment 4
It is configured to the liquid-crystal composition of embodiment 4 by each compound and weight percent listed in table 6, is filled in liquid
It is tested for the property between crystal display two substrates, test data is as shown in the table:
6 liquid crystal combination composition formula of table and its test performance
Embodiment 5
It is configured to the liquid-crystal composition of embodiment 5 by each compound and weight percent listed in table 7, is filled in liquid
It is tested for the property between crystal display two substrates, test data is as shown in the table:
7 liquid crystal combination composition formula of table and its test performance
Embodiment 6
It is configured to the liquid-crystal composition of embodiment 6 by each compound and weight percent listed in table 8, is filled in liquid
It is tested for the property between crystal display two substrates, test data is as shown in the table:
8 liquid crystal combination composition formula of table and its test performance
Embodiment 7
It is configured to the liquid-crystal composition of embodiment 7 by each compound and weight percent listed in table 9, is filled in liquid
It is tested for the property between crystal display two substrates, test data is as shown in the table:
9 liquid crystal combination composition formula of table and its test performance
Embodiment 8
It is configured to the liquid-crystal composition of embodiment 8 by each compound and weight percent listed in table 10, is filled in
It is tested for the property between liquid crystal display two substrates, test data is as shown in the table:
10 liquid crystal combination composition formula of table and its test performance
In order to protrude the beneficial effect of liquid-crystal composition of the invention, inventor chooses close with system of the embodiment of the present invention
Comparative example.Can be seen that liquid-crystal composition provided by the invention by the above comparative example 1, embodiment 1-8 has suitable light
Learn anisotropy, high clearing point and elastic constant K11And K33, also there is relatively low dielectric anisotropy, the liquid crystal
When composition is applied in liquid crystal display, power consumption can be reduced, reduces the response time, increases contrast.
The technical concepts and features of embodiment of above only to illustrate the invention, its object is to allow be familiar with technique
People understands the content of present invention and is implemented, and it is not intended to limit the scope of the present invention, and all spirit according to the present invention is real
The equivalent change or modification that matter is done, should be covered by the scope of protection of the present invention.
Claims (10)
1. a kind of liquid-crystal composition, which is characterized in that the liquid-crystal composition includes:
The compound of at least one general formula I
And the compound of at least one general formula II
Wherein,
R1、R2And R3Expression-H independent ,-F, the alkyl containing 1-12 carbon atom or alkoxy contain 2-12 carbon original
The alkenyl or alkenyloxy group ,-OR of son5OR6、The wherein alkyl or alkoxy and the alkene
One or more H in base or alkenyloxy group can be replaced by F, and R1And R2In at least one be-OR5OR6；
R5And R6It is independent to indicate the alkyl containing 1-12 carbon atom or the alkenyl containing 2-12 carbon atom；
R4Expression-F ,-CF3、-OCF3, fluoro-alkyl containing 1-12 carbon atom or fluoroalkyl, contain 2-12 carbon original
The fluoro alkenyl or fluoro alkenyloxy group of son；
Z1And Z2Expression singly-bound independent ,-COO- ,-OCO- ,-CH2O-、-OCH2Or-CH2CH2-；
Z3Indicate singly-bound ,-COO- ,-OCO- ,-CH2O-、-OCH2-、-CF2O-、-OCF2Or-CH2CH2-；
L1And L2Expression-F ,-Cl ,-CN or-NCS independent；
L3、L4And L5Expression-H ,-F or-CH independent3, and L3And L4It is not simultaneously F；
RingAnd ringExpression independentWherein,Middle one or more-CH2It can be substituted by-O-,Middle one or more H can be optionally substituted by halogen；
RingIt indicatesWhereinMiddle one or more-CH2It can be substituted by-O-, singly-bound can be by double bond in one or more rings
Substitution,Middle one or more H can be optionally substituted by halogen, and-CH=can be substituted by-N=in one or more rings；
N1 and n2 is independent to indicate 0,1,2 or 3, and when n1 is 2 or 3, ringCan be identical or different, Z1
It can be identical or different；When n2 is 2 or 3, ringCan be identical or different, Z2It can be identical or different；
M indicates 1,2,3 or 4, and when m is 2,3,4, ringCan be identical or different, Z3It can be identical or different.
2. liquid-crystal composition according to claim 1, which is characterized in that the compound of the general formula I is selected from following chemical combination
The group of object composition:
And
Wherein,
RingIt indicatesAnd when n1 is 1, ringIt indicatesWhen n1 is 2 or 3, at least one ringIt indicates
L6、L7、L8And L9Expression-H or-F independent；
O indicates 1 or 2；
P and q is independent to indicate 0 or 1.
3. liquid-crystal composition according to claim 2, which is characterized in that the compound of the general formula I -1 is selected from followingization
Close the group of object composition:
And
The compound of the general formula I -2 is selected from the group of following compound composition:
And
Wherein,
R11And R21Expression-H independent ,-F, the alkyl containing 1-7 carbon atom or alkoxy, containing 2-7 carbon atom
Alkenyl or alkenyloxy group ,-OR51OR61、Wherein the alkyl or alkoxy and the alkenyl or
One or more H in alkenyloxy group can be replaced by F, and R11And R21In at least one be-OR51OR61；
R51And R61It is independent to indicate the alkyl containing 1-10 carbon atom or the alkenyl containing 2-10 carbon atom.
4. liquid-crystal composition according to claim 1, which is characterized in that the compound of the general formula II is selected from following chemical combination
The group of object composition:
And
Wherein,
RingRingAnd ringExpression independent
M1 indicates 0,1 or 2.
5. liquid-crystal composition according to claim 4, which is characterized in that the compound of the general formula II -1 is selected from followingization
Close the group of object composition:
And
The compound of the general formula II -2 is selected from the group of following compound composition:
And
Wherein,
R31Expression-H ,-F, the alkyl containing 1-7 carbon atom or alkoxy, the alkenyl containing 2-7 carbon atom or alkenyloxy group ,-
OR5OR6, wherein one or more H in the alkyl or alkoxy and the alkenyl or alkenyloxy group can be replaced by F；
R41Expression-F ,-CF3、-OCF3, fluoro-alkyl containing 1-7 carbon atom or fluoroalkyl, contain 2-7 carbon atom
Fluoro alkenyl or fluoro alkenyloxy group.
6. liquid-crystal composition according to claim 1, which is characterized in that the liquid-crystal composition further includes at least one logical
The compound of formula III:
Wherein,
R7And R8Expression H, alkyl or alkoxy, the alkene containing 2-12 carbon atom containing 1-12 carbon atom independent
Base or alkenyloxy group；
RingAnd ringExpression independent
R indicates 1,2 or 3.
7. liquid-crystal composition according to claim 6, which is characterized in that the compound of the general formula III is selected from following chemical combination
The group of object composition:
And
Wherein, R71And R81It is independent to indicate H, the alkyl containing 1-7 carbon atom or alkoxy, contain 2-7 carbon atom
Alkenyl or alkenyloxy group.
8. liquid-crystal composition according to claim 7, which is characterized in that the compound of the general formula I accounts for the liquid crystal group
The 1~80% of object total weight is closed, the compound of the general formula II accounts for the 1~85% of the liquid-crystal composition total weight, described logical
The compound of formula III accounts for the 0~70% of the liquid-crystal composition total weight.
9. liquid-crystal composition according to claim 8, which is characterized in that the compound of the general formula I accounts for the liquid crystal group
The 20~40% of object total weight are closed, the compound of the general formula II accounts for the 20~60% of the liquid-crystal composition total weight, described
The compound of general formula III accounts for the 15~50% of the liquid-crystal composition total weight.
10. a kind of liquid crystal display device comprising any one of claim 1~9 liquid-crystal composition.
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