CN102902096A - VA (vertical alignment) liquid crystal display device containing optical active ingredients - Google Patents
VA (vertical alignment) liquid crystal display device containing optical active ingredients Download PDFInfo
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- CN102902096A CN102902096A CN2012103881810A CN201210388181A CN102902096A CN 102902096 A CN102902096 A CN 102902096A CN 2012103881810 A CN2012103881810 A CN 2012103881810A CN 201210388181 A CN201210388181 A CN 201210388181A CN 102902096 A CN102902096 A CN 102902096A
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Abstract
The invention provides a liquid crystal display device with vertical alignment. The liquid crystal display device comprises an upper electrode base plate, a lower electrode base plate, and a liquid crystal layer between the upper electrode base plate and the lower electrode base plate, wherein the liquid crystal layer comprises a negative liquid crystal medium; and the liquid crystal medium comprises at least one optical active ingredient. The liquid crystal display device has the advantages that the liquid crystal medium arranged between the upper electrode base plate and the lower electrode base plate contains liquid crystal molecules with optical activity, the liquid crystal molecules in the electric field can obtain large power through low driving voltage, so as to rapidly rotate, the operation requirement on low driving voltage by a display can be satisfied, and the liquid crystal medium has low viscosity and high clearing points.
Description
Technical field
The present invention relates to field of liquid crystal display, the liquid crystal media that relates in particular to the negativity dielectric constant anisotropy that adds the chirality agent is applied in the VA pattern.
Background technology
The scientific research personnel has developed different liquid crystal display patterns in recent years.Wherein, most important liquid crystal display pattern is the TN(twisted-nematic) pattern, STN(supertwist be to row) pattern, the internal conversion of IPS(face) pattern, the light-operated birefringence of OCB() pattern and VA(vertical orientation) pattern etc.These all patterns are all used electric field, wherein, TN(twisted-nematic), the STN(supertwist is to row), the light-operated birefringence of OCB() and the VA(vertical orientation) electric field of pattern is substantially perpendicular to substrate, or perpendicular to liquid crystal layer.Except these patterns, also exist to adopt to be arranged essentially parallel to substrate, or the electrooptics pattern of the electric field of liquid crystal layer, such as the internal conversion of IPS(face) pattern.
The VA(vertical orientation) pattern adopts liquid crystal molecule vertically and the arrangement mode of substrate, uses the liquid crystal media of negativity dielectric constant anisotropy, has extraordinary dark attitude, and contrast is high.But still exist some problems to need to solve, for example the absolute value of the negativity dielectric constant anisotropy of liquid crystal media is large not, causes driving voltage low not; The viscosity of liquid crystal media is low not, causes tackling the demand of quick response.
Therefore, in field of liquid crystal display, the liquid crystal media that urgent need will solve the negativity dielectric constant anisotropy is applied to the existing problem of VA pattern.
Summary of the invention
In order to address the above problem.The invention provides a kind of liquid crystal display device, comprise:
One top electrode substrate;
Electrode base board once;
And a liquid crystal layer between described top electrode substrate and described bottom electrode substrate, described liquid crystal layer comprises a kind of dielectric constant anisotropy and is negative liquid crystal media, and described liquid crystal media comprises at least a optical activity composition;
Wherein, the orientation of liquid crystal molecule is substantially vertical with described top electrode substrate or plane, described bottom electrode substrate place in the described liquid crystal media.
Angle between the direction on the described orientation that substantially vertically refers to liquid crystal molecule and described top electrode substrate or plane, described bottom electrode substrate place is: 80 °≤θ≤90 °.Within this scope, the VA liquid crystal display device can obtain preferably contrast and faster response speed.
Described liquid crystal media comprises the optically active substance of a kind of general formula (I) expression at least:
Wherein,
R
1Be selected from by the alkyl with 1-12 carbon atom or alkoxy and have the alkenyl of 2-12 carbon atom or the group that alkenyloxy forms, wherein, at described R
1And R
2In one or more-CH
2-can be independently of one another by-CH=CH-,-O-,-CH=CF-,-CF=CH-,-CF=CF-,-CO-O-or-O-CO-substitutes, its prerequisite is that oxygen atom directly is not connected to each other;
R
2* be selected from the chiral radicals of 1-20 carbon atom, described chiral radicals can be unsubstituted or be replaced or polysubstituted wherein one or more non-conterminous-CH by F, Cl, Br or CN are single
2-can be independently of one another by-O-,-CO-,-COO-,-OCO-,-OCOO-,-CH=CH-and-C ≡ C-substitutes, its prerequisite is that oxygen atom does not directly link to each other; Selectively, described chiral radicals comprises one or more aromatic rings or cycloaliphatic ring, and selectively, described aromatic rings or cycloaliphatic ring comprise condensed ring or volution and comprise one or more heteroatoms; Selectively, described chiral radicals is the polymerizable chiral group;
Z
1, Z
2Independent of each other be selected from by-COO-,-OCO-,-CH
2O-,-OCH
2-,-CF
2O-,-OCF
2-,-CH
2CH
2-,-CF
2CF
2-,-CF=CF-,-CH=CH-,-C ≡ C-,-CH=CH-COO-,-group that OCO-CH=CH-and singly-bound form;
X be selected from by-O-,-CH
2-,-CO-,-COO-,-OCO-,-CH
2O-,-OCH
2-,-CF
2O-,-OCF
2-,-CH
2CH
2-,-CF
2CF
2-,-CF=CF-,-CH=CH-,-group that C ≡ C-and singly-bound form;
Ring A, ring B and ring C are identical or different, are selected from independently of one another by Isosorbide-5-Nitrae-cyclohexylidene, 1,4-phenylene, Isosorbide-5-Nitrae-cyclohexadienylidene, Isosorbide-5-Nitrae-Ya two rings [2,2,2] octyl group, 1,3-dioxane-4,5-two bases, pyridine-2,5-two bases, pyrimidine-2,5-two bases, naphthalene-2,6-two bases, decahydronaphthalene-2,6-two base and naphthanes-2, the group that the group in 6-two bases forms; Wherein, selectively, one or more hydrogen atom quilt-F among described ring A, ring B and the ring C ,-Cl ,-CN ,-CF
3,-OCF
3,-CH
2F ,-OCH
2F ,-OCH
3Or-CH
3Replace, or one or two the non-conterminous-CH among described ring A, ring B and the ring C
2-can by-O-,-S-,-CF
2-or-CO-substitutes, and prerequisite is-O-,-S-directly is not connected to each other, and perhaps, 1 ~ 2-CH=among described ring A, ring B and the ring C can be substituted by-N=;
N is 0,1,2 or 3.
In some embodiments, one or more compounds in the group of the preferred free general formula of the optically active substance of described general formula (I) (I-1)～general formula (I-18) composition:
In the formula,
R
1Be selected from the group that alkyl or the alkoxy with 1-12 carbon atom, the alkenyl with 2-12 carbon atom or alkenyloxy form, wherein, at described R
1And R
2In one or more-CH
2-group can be independently of one another by-CH=CH-,-O-,-CH=CF-,-CF=CH-,-CF=CF-,-CO-O-or-O-CO-substitutes, its prerequisite is that oxygen atom directly is not connected to each other;
R
2* be selected from the chiral radicals of 1-20 carbon atom, described chiral radicals can be unsubstituted or be replaced or polysubstituted wherein one or more non-conterminous-CH by F, Cl, Br or CN are single
2-can be independently of one another by-O-,-CO-,-COO-,-OCO-,-OCOO-,-CH=CH-and-C ≡ C-replaces, its prerequisite is that oxygen atom does not directly link to each other; Can also contain one or more aromatic rings or cycloaliphatic ring, it can comprise condensed ring or volution and also can contain one or more heteroatomss, or the polymerizable chiral group;
X is selected from-O-,-CH
2-,-CO-,-COO-,-OCO-,-CH
2O-,-OCH
2-,-CF
2O-,-OCF
2-,-CH
2CH
2-,-CF
2CF
2-,-CF=CF-,-CH=CH-,-C ≡ C-or singly-bound.
In embodiments of the invention, the content of optically active substance in liquid crystal media of described general formula (I) expression is 0.01%-5%(weight), be preferably 0.05%-3%(weight).
In embodiments of the invention, the chirality pitch P (Pitch) of described liquid crystal media is 1 μ m≤P≤100 μ m, is preferably 2 μ m≤P≤40 μ m.
In embodiments of the invention, the ratio G/P of the clearance G between described top electrode substrate and the described bottom electrode substrate and the chirality pitch P (Pitch) of described liquid crystal media is 0.005≤G/P≤0.5, is preferably 0.01≤G/P≤0.25.
Compared with the prior art, advantage applies of the present invention exists: the liquid crystal media of establishing between top electrode substrate of the present invention, the bottom electrode substrate contains and has optically active liquid crystal molecule, use the lower driving voltage just can be so that liquid crystal molecule in electric field obtains larger power, rotate rapidly, can satisfy display to the request for utilization of low driving voltage, and described liquid crystal media have lower viscosity and higher cleaning point.
The present invention carries out combination experiment by the optically active substance of mutual-through type (I) expression, by with the comparison of reference examples, determined to comprise the liquid crystal media of the compound of general formula (I), when being applied to the VA display mode, can make the VA pattern have that driving voltage is low, the advantage of fast response time.
In the present invention if no special instructions, described ratio is weight ratio, and all temperature are degree celsius temperature, and the box that the test of described response time data is selected is thick to be 4 μ m.
Description of drawings
Fig. 1 is the structural representation of liquid crystal display of the present invention.
Embodiment
Below with reference to specific embodiments the present invention is described.Need to prove that the following examples are example of the present invention, only be used for illustrating the present invention, and be not used for limiting the present invention.In the situation that does not depart from purport of the present invention or scope, can carry out the present invention and conceive interior other combination and various improvement.
Below the liquid crystal display that adopts of each embodiment be the VA-TFT liquid crystal display, the thick d=4 μ of box m partly is made of polarizer (polaroid), electrode base board etc.This display device is normal white mode, and when namely not having voltage difference to put between the row and column electrode, the observer observes the pixel color of white.Up and down polarizer axes on the substrate is 90 degrees to each other the angle.Space between two substrates is full of optically anisotropic liquid crystal media.
For the purpose of brief description, liquid crystal display device of the present invention (1) comprises as shown in Figure 1: top electrode substrate (2), bottom electrode substrate (3) and liquid crystal layer (4); Wherein, liquid crystal layer (4) is between top electrode substrate (2) and bottom electrode substrate (3); Liquid crystal layer comprises liquid crystal media, has liquid crystal molecule (5) in the liquid crystal media.
For ease of expressing, below among each embodiment, the unit structure of liquid-crystal compounds is with the listed coded representation of table 1:
The unit structure code of table 1 liquid-crystal compounds
Take following structure as example:
This structure is with the coded representation in the table 1: then can be expressed as 3PTG1(2F) OP3, and for example:
Then can be expressed as nCPTPOm, the n in the code represents the C atomicity of left end alkyl, and for example n is " 3 ", represents that namely this alkyl is-C
3H
7C in the code represents cyclohexyl; O represention oxygen atom in the code; P in the code represents phenylene; M in the code represents the C atomicity of right-hand member alkyl, and for example m is " 1 ", represents that namely the alkyl of right-hand member is-CH
3
The code name of writing a Chinese character in simplified form of each test event is expressed as respectively among the embodiment:
Cp (℃) cleaning point (℃, to row-isotropic phase transition temperature)
η fluid viscosity (mPa*s, 20 ℃)
Δ n optical anisotropy (589nm, 20 ℃)
Δ ε dielectric anisotropy (1KHz, 25 ℃)
V
0: driving voltage (1KHZ, 20 ℃, VA testing cassete)
Toff: OFF state response time (ms, 25 ℃)
Each composition that adopts in following embodiment all can synthesize by known method, perhaps obtains by commercial sources.These synthetic technologys are conventional, and resulting each liquid-crystal compounds meets electrical type compound standard after tested.
Reference examples
Consist of liquid crystal display device according to Fig. 1.
Liquid crystal media M-1 by each listed in the table 2 compound and percent by weight are mixed with reference examples carries out performance test with its liquid crystal layer (4) that is filled between the liquid crystal display two substrates, and test data is as shown in the table:
Prescription and the test performance thereof of table 2 liquid crystal media M-1
This potpourri has suitable Δ n numerical value, the Δ ε numerical value that appropriateness is high and the low fluid viscosity of appropriateness.Therefore it is applicable to
Adopt in the display of VA display mode operation.
Consist of liquid crystal display device with reference examples 1.
Press weight ratio listed in the table 3 and add optically active substance involved in the present invention in the liquid crystal media M-1 of reference examples 1, it is filled in liquid crystal layer between the liquid crystal display two substrates (4) and carries out performance test, and test data is as shown in the table:
Table 3 liquid crystal media prescription and test performance thereof
By using the optically active substance of general formula (I) expression, liquid crystal media is being kept in the substantially constant situation of photoelectric parameter, obtain lower driving voltage, and promoted response speed, therefore be suitable for very much adopting in the liquid crystal display of VA display mode operation.
Claims (10)
1. a liquid crystal display device is characterized in that, described liquid crystal display device comprises:
One top electrode substrate;
Electrode base board once;
And a liquid crystal layer between described top electrode substrate and described bottom electrode substrate, described liquid crystal layer comprises a kind of dielectric constant anisotropy and is negative liquid crystal media, and described liquid crystal media comprises at least a optical activity composition;
Wherein, the orientation of liquid crystal molecule is substantially vertical with described top electrode substrate or plane, described bottom electrode substrate place in the described liquid crystal media.
2. liquid crystal display device according to claim 1 is characterized in that, the angle theta in the described liquid crystal media between the orientation of liquid crystal molecule and described top electrode substrate or the plane, described bottom electrode substrate place is: 80 °≤θ≤90 °.
3. liquid crystal display device according to claim 1 and 2 is characterized in that, described optical activity composition is selected from the compound with general formula I:
Wherein,
R
1Be selected from by the alkyl with 1-12 carbon atom or alkoxy and have the alkenyl of 2-12 carbon atom or the group that alkenyloxy forms, wherein, at described R
1And R
2In one or more-CH
2-can be independently of one another by-CH=CH-,-O-,-CH=CF-,-CF=CH-,-CF=CF-,-CO-O-or-O-CO-substitutes, its prerequisite is that oxygen atom directly is not connected to each other;
R
2* be selected from the chiral radicals of 1-20 carbon atom, described chiral radicals can be unsubstituted or be replaced or polysubstituted wherein one or more non-conterminous-CH by F, Cl, Br or CN are single
2-can be independently of one another by-O-,-CO-,-COO-,-OCO-,-OCOO-,-CH=CH-and-C ≡ C-substitutes, its prerequisite is that oxygen atom does not directly link to each other; Selectively, described chiral radicals comprises one or more aromatic rings or cycloaliphatic ring, and selectively, described aromatic rings or cycloaliphatic ring comprise condensed ring or volution and comprise one or more heteroatoms; Selectively, described chiral radicals is the polymerizable chiral group;
Z
1, Z
2Independent of each other be selected from by-COO-,-OCO-,-CH
2O-,-OCH
2-,-CF
2O-,-OCF
2-,-CH
2CH
2-,-CF
2CF
2-,-CF=CF-,-CH=CH-,-C ≡ C-,-CH=CH-COO-,-group that OCO-CH=CH-and singly-bound form;
X be selected from by-O-,-CH
2-,-CO-,-COO-,-OCO-,-CH
2O-,-OCH
2-,-CF
2O-,-OCF
2-,-CH
2CH
2-,-CF
2CF
2-,-CF=CF-,-CH=CH-,-group that C ≡ C-and singly-bound form;
Ring A, ring B and ring C are identical or different, are selected from independently of one another by Isosorbide-5-Nitrae-cyclohexylidene, 1,4-phenylene, Isosorbide-5-Nitrae-cyclohexadienylidene, Isosorbide-5-Nitrae-Ya two rings [2,2,2] octyl group, 1,3-dioxane-4,5-two bases, pyridine-2,5-two bases, pyrimidine-2,5-two bases, naphthalene-2,6-two bases, decahydronaphthalene-2,6-two base and naphthanes-2, the group that the group in 6-two bases forms; Wherein, selectively, one or more hydrogen atom quilt-F among described ring A, ring B and the ring C ,-Cl ,-CN ,-CF
3,-OCF
3,-CH
2F ,-OCH
2F ,-OCH
3Or-CH
3Replace, or one or two the non-conterminous-CH among described ring A, ring B and the ring C
2-can by-O-,-S-,-CF
2-or-CO-substitutes, and prerequisite is-O-,-S-directly is not connected to each other, and perhaps, 1 ~ 2-CH=among described ring A, ring B and the ring C can be substituted by-N=;
N is 0,1,2 or 3.
4. liquid crystal display device according to claim 3 is characterized in that, the compound of described general formula I is selected from the group that is comprised of general formula I-1 to the compound of general formula I-18:
5. according to claim 3 or 4 described liquid crystal display devices, it is characterized in that described optically active substance accounts for the 0.01%-5% of described liquid crystal media general assembly (TW).
6. liquid crystal display device according to claim 5 is characterized in that, described optically active substance accounts for the 0.05%-3% of described liquid crystal media general assembly (TW).
7. liquid crystal display device according to claim 1 is characterized in that, the chirality pitch P of described liquid crystal media is 1 μ m≤P≤100 μ m.
8. liquid crystal display device according to claim 7 is characterized in that, the chirality pitch P of described liquid crystal media is 2 μ m≤P≤40 μ m.
9. liquid crystal display device according to claim 8 is characterized in that, the ratio G/P of the clearance G between described top electrode substrate and the described bottom electrode substrate and the chirality pitch P of described liquid crystal media is 0.005≤G/P≤0.5.
10. liquid crystal display device according to claim 9 is characterized in that, the ratio G/P of the clearance G between described top electrode substrate and the described bottom electrode substrate and the chirality pitch P of described liquid crystal media is 0.01≤G/P≤0.25.
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| TWI500746B (en) * | 2013-02-01 | 2015-09-21 | Jiangsu Hecheng Display Tech | A liquid crystal display device of stable alignment type and a liquid crystal display device for use therefor |
| WO2017219902A1 (en) * | 2016-06-20 | 2017-12-28 | 江苏和成显示科技股份有限公司 | Compound comprising ethyleneoxy, and composition and application thereof |
| CN107532085A (en) * | 2015-06-24 | 2018-01-02 | Dic株式会社 | Nematic liquid-crystal composition and use its liquid crystal display cells |
| CN109154753A (en) * | 2016-05-17 | 2019-01-04 | 默克专利股份有限公司 | Optical modulation element |
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