CN109575948A - A kind of liquid-crystal composition and its liquid crystal display device - Google Patents
A kind of liquid-crystal composition and its liquid crystal display device Download PDFInfo
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- CN109575948A CN109575948A CN201710894505.0A CN201710894505A CN109575948A CN 109575948 A CN109575948 A CN 109575948A CN 201710894505 A CN201710894505 A CN 201710894505A CN 109575948 A CN109575948 A CN 109575948A
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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
Abstract
The invention discloses a kind of liquid-crystal composition and its liquid crystal display device, 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 have suitable optical anisotropy, high clearing point, big dielectric anisotropy absolute value while also there is preferable low-temperature storage, when the liquid-crystal composition is applied in liquid crystal display, the driving voltage of liquid crystal display can be reduced, reduce power consumption, liquid crystal display has preferable weatherability simultaneously, can use in harsh external environment.
Description
Technical field
The present invention relates to liquid crystal material fields, and in particular to a kind of liquid-crystal composition and its liquid crystal display device.
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.It is mentioned to obtain the liquid crystal display element with superperformance
The performance indexes of high liquid-crystal composition, we are corresponding with liquid crystal display element a kind of by a kind of performance of liquid-crystal composition
Association between performance is summarized in following table 1.The items of composition are further illustrated according to commercially available liquid crystal display element
Performance indicator.Nematic temperature range is associated with the operating temperature range of element.Nematic ceiling temperature is preferably
More than or equal to 70 DEG C, and nematic lower limit temperature is preferably less than and is equal to -10 DEG C.The viscosity of composition and the sound of element
It is associated between seasonable.It is preferably that the response time of element is short to show animation in the component.It therefore, is preferably combination
The viscosity of object is small, and be preferably composition when temperature is low viscosity it is small.
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 |
Single liquid-crystal compounds is generally difficult to play its characteristic, usually mixes it with other various liquid crystal compounds and matches
Composition is made.In available liquid crystal composition, preferably characteristic can be obtained, but the category combinations object clearing point it is lower,
Viscosity is higher, optical anisotropy is not big enough, the absolute value of dielectric anisotropy is lower, voltage retention is low, has to being mixed into
There is the composition compared with large optical anisotropic, the anisotropic absolute value of suitable dielectric, better stability and preferable contrast
It helps less, to directly result in the adverse consequences such as contrast is low, slow, the device display effect difference of response speed, such as foreign patent text
WO9202597, WO9116398, WO9302153, WO9116399, Chinese patent literature CN1157005A etc. are offered, in varying degrees
With disadvantages mentioned above.
Therefore, it is necessary to a kind of liquid-crystal composition, with big optical anisotropy, high dielectric anisotropy it is absolute
The characteristics such as value, high clearing point, low driving voltage, preferable stability, good steepness, good grayscale display effect.
Summary of the invention
Goal of the invention: in view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of optical anisotropies greatly, is situated between
The absolute value of electrical anisotropy is big, with wide nematic phase, the liquid crystal combination that low temperature storage stability is high and driving voltage is low
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, and the liquid-crystal composition includes:
The compound of at least one general formula I
The compound of at least one general formula II
Wherein,
R1Indicate the alkyl containing 1-7 carbon atom；
R2Expression-H ,-F, alkyl or alkoxy, alkenyl or alkene oxygen containing 2-7 carbon atom containing 1-7 carbon atom
Base,Wherein one or more in the alkyl or alkoxy and the alkenyl or alkenyloxy group
A H can be replaced by F；
X1And X2Expression-F independent ,-CF3、-OCF3,-CN or-SCN；
Z1And Z2Expression singly-bound independent ,-COO- ,-OCO- ,-CH2O-、-OCH2-、-CF2O-、-OCF2Or-
CH2CH2-；
L1And L4Expression-H or-CH independent3；
L2、L3、L5And L6Expression-H or-F independent；
RingAnd ringExpression independent WhereinMiddle one or more-CH2It can be substituted by-O-,
Middle one or more H can be optionally substituted by halogen, middle ringAnd ringIn one or more singly-bounds
It can be substituted by double bond, one or more-CH=can be substituted by-N=；
The integer of a expression 1-12；
N and m is independent to indicate 1,2,3 or 4, and when n is 2,3,4, ringCan be identical or different,
Z1It can be identical or different；When m is 2,3,4, ringCan be identical or different, Z2It can be identical or different.
Preferably, the compound of the general formula I is selected from the group of following compound composition:
Wherein,
RingAnd ringExpression independent
Z11Indicate singly-bound ,-COO- ,-OCO- ,-CH2O-、-OCH2Or-CH2CH2-；
N1 indicates 0,1,2 or 2, and when n1 is 2 or 3, ringCan be identical or different, Z1Can it is identical or
It is different.
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:
In certain embodiments of the present invention, a is preferably 2,3 or 4.
In certain embodiments of the present invention, the compound of the general formula I accounts for the 5- of the liquid-crystal composition total weight
80%；Preferably, the compound of the general formula I accounts for the 5-65% of the liquid-crystal composition total weight；It is further preferred that described
The compound of general formula I accounts for the 10-50% of the liquid-crystal composition total weight；Still further preferably, the compound of the general formula I
Account for the 10-30% of the liquid-crystal composition total weight.
Preferably, the compound of the general formula II is selected from the group of following compound composition:
Wherein,
RingAnd ringExpression independent
Z21Indicate singly-bound ,-COO- ,-OCO- ,-CH2O-、-OCH2Or-CH2CH2-；
M1 indicates 0,1 or 2, and when m1 is 2, ringCan be identical or different, Z2It can be identical or different.
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:
Further, the liquid-crystal composition also includes the compound of at least one general formula III
Wherein,
R3And R4Expression-H independent, the alkyl containing 1-12 carbon atom or alkoxy contain 2-12 carbon atom
Alkenyl or alkenyloxy group,
RingRingAnd ringExpression independent
Z3Indicate singly-bound ,-COO- ,-OCO- ,-CH2O-、-OCH2Or-CH2CH2-；
R indicates 0,1 or 2, and when r is 2, ringCan be identical or different, Z3It can be identical or different.
In certain embodiments of the present invention, the compounds of formula II accounts for the liquid-crystal composition total weight
10-80%；Preferably, the compounds of formula II accounts for the 10-70% of the liquid-crystal composition total weight；Further preferably
Ground, the compounds of formula II account for the 10-60% of the liquid-crystal composition total weight；Still further preferably, the general formula
The compound of II accounts for the 10-50% of the liquid-crystal composition total weight.
Preferably, the compound of the general formula III is selected from the group of following compound composition:
Wherein,
R31And R41Expression-H independent, the alkyl containing 1-7 carbon atom or alkoxy contain 2-7 carbon atom
Alkenyl or alkenyloxy group,
In some embodiments of the present invention, it is preferable 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:
The compound of the general formula III -13 is selected from the group being made of following compound:
The compound of the general formula III -14 is selected from the group being made of following compound:
The compound of the general formula III -15 is selected from the group being made of following compound:
The compound of the general formula III -16 is selected from the group being made of following compound:
In some embodiments of the present invention, R31And R41In at least one be alkenyl or alkene containing 2-7 carbon atom
Oxygroup.
In some embodiments of the present invention, the compound of the general formula I accounts for the 5- of the liquid-crystal composition total weight
80%, the compound of the general formula II accounts for the 10-80% of the liquid-crystal composition total weight, and the general formula III accounts for the liquid crystal group
Close the 5-80% of object 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 10-50% of weight, the compound of the general formula II account for the 10-70% of the liquid-crystal composition total weight, and the general formula III accounts for
The 10-60% of the liquid-crystal composition total weight.
In some embodiments of the present invention, the compound of the general formula I preferably is selected from following compound: I-1-1, I-1-
2, the group of I-1-3, I-1-4, I-1-10, I-1-20 and I-2-1 composition.
In some embodiments of the present invention, the compound of the general formula II preferably is selected from following compound: II-1-1,
II-1-2, II-1-4, II-1-7, II-1-17, II-2-1, II-2-7, II-2-28, II-2-2, II-2-30 and II-2-49 group
At group.
In some embodiments of the present invention, the compound of the general formula III preferably is selected from following compound: III -1-10,
The group of III -1-15, III -5-4, III -8-4, III -14-6 and III -16-10 composition.
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 account for the 0-15wt% of the liquid-crystal composition total weight pleochroic dye 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 0-5wt% of the liquid-crystal composition total weight；More
Excellently, the dopant accounts for the 0-1wt% 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 0-5wt% of the liquid-crystal composition total weight；More
Excellently, the stabilizer accounts for the 0-1wt% of the liquid-crystal composition total weight；As particularly preferred scheme, the stabilizer is accounted for
The 0-0.1wt% of the 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 have suitable optical anisotropy, high clearing point, big dielectric respectively to
Also there is preferable low-temperature storage while the absolute value of the opposite sex, when the liquid-crystal composition is applied in liquid crystal display,
The driving voltage of liquid crystal display can be reduced, reduces power consumption, while liquid crystal display has preferable weatherability, it can be tight
It is used in severe external environment.
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 2 of liquid-crystal composition is indicated:
The group structure code of 2 liquid-crystal compounds of table
By taking the compound of following structural formula as an example:
The structural formula is indicated such as the code listed by table 2, 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 representative-F.
In following embodiment test item to write a Chinese character in simplified form code name as follows:
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⊥For the dielectric constant perpendicular to molecular axis,
Test condition: 25 DEG C, 1KHz, testing cassete be TN90 type, box is 7 μm thick.
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
The liquid-crystal composition of comparative example 1 is configured to by each compound and weight percent listed in table 3, be filled in
It is tested for the property between liquid 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 1
The liquid-crystal composition of embodiment 1 is configured to by each compound and weight percent listed in table 4, be filled in
It is tested for the property between liquid 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 2
The liquid-crystal composition of embodiment 2 is configured to by each compound and weight percent listed in table 5, be filled in
It is tested for the property between liquid crystal display two substrates, test data is as shown in the table:
5 liquid crystal combination composition formula of table and its test performance
By comparative example 1 and the comparison of embodiment 1,2 it is found that liquid crystal can be significantly improved after the component of introducing general formula I of the present invention
The clearing point of composition, the absolute value of dielectric anisotropy and low-temperature storage performance.
Comparative example 2
The liquid-crystal composition of comparative example 2 is configured to by each compound and weight percent listed in table 6, be filled in
It is tested for the property between liquid 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 3
The liquid-crystal composition of embodiment 3 is configured to by each compound and weight percent listed in table 7, be filled in
It is tested for the property between liquid crystal display two substrates, test data is as shown in the table:
7 liquid crystal combination composition formula of table and its test performance
By comparative example 2 and the comparison of embodiment 3 it is found that liquid crystal group can be significantly improved after the component of introducing general formula I of the present invention
Close the clearing point of object, the absolute value and low-temperature storage performance of dielectric anisotropy.
Embodiment 4
The liquid-crystal composition of embodiment 4 is configured to by each compound and weight percent listed in table 8, be filled in
It is tested for the property between liquid 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 5
The liquid-crystal composition of embodiment 5 is configured to by each compound and weight percent listed in table 9, be filled in
It is tested for the property between liquid 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 6
It is configured to the liquid-crystal composition of embodiment 6 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
Can be seen that liquid-crystal composition provided by the invention by the above comparative example and embodiment has suitable optics each
Anisotropy, high clearing point, big dielectric anisotropy absolute value while also there is preferable low-temperature storage, the liquid
When brilliant composition is applied in liquid crystal display, driving voltage can be reduced, reduces power consumption, while there is preferable weatherability,
It can be used in harsh external environment.
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 (11)
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,
R1Indicate the alkyl containing 1-7 carbon atom；
R2Expression-H ,-F, the alkyl containing 1-7 carbon atom or alkoxy, the alkenyl containing 2-7 carbon atom or alkenyloxy group,Wherein one or more H in the alkyl or alkoxy and the alkenyl or alkenyloxy group
It can be replaced by F；
X1And X2Expression-F independent ,-CF3、-OCF3,-CN or-SCN；
Z1And Z2Expression singly-bound independent ,-COO- ,-OCO- ,-CH2O-、-OCH2-、-CF2O-、-OCF2Or-CH2CH2-；
L1And L4Expression-H or-CH independent3；
L2、L3、L5And L6Expression-H or-F independent；
RingAnd ringExpression independent WhereinMiddle one or more-CH2It can be substituted by-O-,Middle one or more H can be optionally substituted by halogen, middle ringAnd ringIn one
Or multiple singly-bounds can be substituted by double bond, one or more-CH=can be substituted by-N=；
The integer of a expression 1-12；
N and m is independent to indicate 1,2,3 or 4, and when n is 2,3,4, ringCan be identical or different, Z1It can
With identical or different；When m is 2,3,4, ringCan be identical or different, Z2It 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:
Wherein,
RingAnd ringExpression independent
Z11Indicate singly-bound ,-COO- ,-OCO- ,-CH2O-、-OCH2Or-CH2CH2-；
N1 indicates 0,1,2 or 3, and when n1 is 2 or 3, ringCan be identical or different, Z1It can be identical or different.
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:
The compound of the general formula I -2 is selected from the group of following compound composition:
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:
Wherein,
RingAnd ringExpression independent
Z21Indicate singly-bound ,-COO- ,-OCO- ,-CH2O-、-OCH2Or-CH2CH2-；
M1 indicates 0,1 or 2, and when m1 is 2, ringCan be identical or different, Z2It can be identical or different.
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:
The compound of the general formula II -2 is selected from the group of following compound composition:
6. liquid-crystal composition according to claim 1, which is characterized in that the liquid-crystal composition also includes at least one logical
The compound of formula III
Wherein,
R3And R4Expression-H independent, alkyl or alkoxy, the alkene containing 2-12 carbon atom containing 1-12 carbon atom
Base or alkenyloxy group,
RingRingAnd ringExpression independent
Z3Indicate singly-bound ,-COO- ,-OCO- ,-CH2O-、-OCH2Or-CH2CH2-；
R indicates 0,1 or 2, and when r is 2, ringCan be identical or different, Z3It can be identical or different.
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:
Wherein,
R31And R41Expression-H independent, alkyl or alkoxy, the alkene containing 2-7 carbon atom containing 1-7 carbon atom
Base or alkenyloxy group,
8. liquid-crystal composition according to claim 1, which is characterized in that the compound of the general formula I accounts for the liquid crystal group
Close the 5-80% of object total weight.
9. liquid-crystal composition according to claim 1, which is characterized in that the compound of the general formula II accounts for the liquid crystal group
Close the 10-80% of object total weight.
10. liquid-crystal composition according to claim 6, which is characterized in that the compound of the general formula I accounts for the liquid crystal group
The 10-50% of object total weight is closed, the compound of the general formula II accounts for the 10-70% of the liquid-crystal composition total weight, described logical
Formula III accounts for the 10-60% of the liquid-crystal composition total weight.
11. a kind of liquid crystal display device comprising any one of claim 1~10 liquid-crystal composition.
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| WO1997029167A1 (en) * | 1996-02-09 | 1997-08-14 | Chisso Corporation | Liquid crystal composition and liquid crystal display element |
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