CN102902096B - 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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- CN102902096B CN102902096B CN201210388181.0A CN201210388181A CN102902096B CN 102902096 B CN102902096 B CN 102902096B CN 201210388181 A CN201210388181 A CN 201210388181A CN 102902096 B CN102902096 B CN 102902096B
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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, particularly relate to the anisotropic liquid crystal media of negative dielectric constant adding chiral agent and be applied in VA pattern.
Background technology
Scientific research personnel have developed different liquid crystal display mode in recent years.Wherein, most important liquid crystal display mode is TN(twisted-nematic) pattern, STN(supertwist is 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 all use electric field, wherein, TN(twisted-nematic), STN(supertwist is to row), the light-operated birefringence of OCB() and VA(vertical orientation) electric field of pattern is substantially perpendicular to substrate, or perpendicular to liquid crystal layer.Except these patterns, also there is employing and be arranged essentially parallel to substrate, or the electrooptics pattern of the electric field of liquid crystal layer, as the internal conversion of IPS(face) pattern.
VA(vertical orientation) pattern adopts the vertical arrangement mode with substrate of liquid crystal molecule, and the anisotropic liquid crystal media of use negative dielectric constant, have extraordinary dark-state, contrast is high.Such as, but still there are some problems to need to solve, the anisotropic absolute value of negative dielectric constant of liquid crystal media is large not, causes driving voltage low not; The viscosity of liquid crystal media is low not, causes the demand cannot tackling response fast.
Therefore, in field of liquid crystal display, be badly in need of solving the anisotropic liquid crystal media of negative dielectric constant and be applied to problem existing for VA pattern.
Summary of the invention
In order to solve the problem.The invention provides a kind of liquid crystal display device, comprise:
One upper electrode substrate;
One lower electrode substrate;
And a liquid crystal layer between described upper electrode substrate and described lower electrode substrate, it is negative liquid crystal media that described liquid crystal layer comprises a kind of dielectric constant anisotropy, and described liquid crystal media comprises at least one optical activity component;
Wherein, in described liquid crystal media orientation and the described upper electrode substrate of liquid crystal molecule or described lower electrode substrate place plane substantially vertical.
Angle between the direction of the described orientation substantially vertically referring to liquid crystal molecule and described upper electrode substrate or described lower electrode substrate place plane is: 80 °≤θ≤90 °.Within this scope, VA liquid crystal display device can obtain good contrast and response speed faster.
Described liquid crystal media at least comprises the optically active substance that a kind of general formula (I) represents:
Wherein,
R
1be selected from the group be made up of with the alkenyl or alkenyloxy with 2-12 carbon atom the alkyl or alkoxy with 1-12 carbon atom, wherein, at described R
1and R
2in one or more-CH
2-can be substituted by-CH=CH-,-O-,-CH=CF-,-CF=CH-,-CF=CF-,-CO-O-or-O-CO-independently of one another, its prerequisite is that oxygen atom is not directly connected to each other;
R
2* be selected from the chiral radicals of 1-20 carbon atom, described chiral radicals can be unsubstituted or monosubstituted or polysubstituted by F, Cl, Br or CN, wherein one or more non-conterminous-CH
2-can be substituted by-O-,-CO-,-COO-,-OCO-,-OCOO-,-CH=CH-and-C ≡ C-independently of one another, its prerequisite is that oxygen atom is not directly connected; 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 polymerizable chiral group;
Z
1, Z
2independent of each otherly to 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-,-OCO-CH=CH-and singly-bound composition group;
X is 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-,-C ≡ C-and singly-bound composition group;
Ring A, ring B and ring C are identical or different, are selected from by Isosorbide-5-Nitrae-cyclohexylidene, 1 independently of one another, 4-phenylene, Isosorbide-5-Nitrae-cyclohexadienylidene, Isosorbide-5-Nitrae-Ya two ring [2,2,2] octyl group, 1,3-dioxane-4,5-bis-base, pyridine-2,5-bis-base, pyrimidine-2,5-bis-base, naphthalene-2,6-bis-base, decahydronaphthalene-2, the group of the group composition in 6-bis-base and naphthane-2,6-bis-base; Wherein, selectively, one or more hydrogen atom in described ring A, ring B and ring C is by-F ,-Cl ,-CN ,-CF
3,-OCF
3,-CH
2f ,-OCH
2f ,-OCH
3or-CH
3replace, or one or two the non-conterminous-CH in described ring A, ring B and ring C
2-can by-O-,-S-,-CF
2-or-CO-is alternative, and prerequisite is that-O-,-S-are not directly connected to each other, or 1 ~ 2-CH=in described ring A, ring B and ring C can be substituted by-N=;
N is 0,1,2 or 3.
In some embodiments, one or more compounds in the group that forms of the optically active substance of described general formula (I) preferred free general formula (I-1) ~ general formula (I-18):
In formula,
R
1be selected from the group of alkyl or alkoxy, the alkenyl with 2-12 carbon atom or the alkenyloxy composition with 1-12 carbon atom, wherein, at described R
1and R
2in one or more-CH
2-group can be substituted by-CH=CH-,-O-,-CH=CF-,-CF=CH-,-CF=CF-,-CO-O-or-O-CO-independently of one another, and its prerequisite is that oxygen atom is not directly connected to each other;
R
2* be selected from the chiral radicals of 1-20 carbon atom, described chiral radicals can be unsubstituted or monosubstituted or polysubstituted by F, Cl, Br or CN, wherein one or more non-conterminous-CH
2-can be replaced by-O-,-CO-,-COO-,-OCO-,-OCOO-,-CH=CH-and-C ≡ C-independently of one another, its prerequisite is that oxygen atom is not directly connected; 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 heteroatoms, or 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 the optically active substance that described general formula (I) represents in liquid crystal media 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 μm≤P≤100 μm, is preferably 2 μm≤P≤40 μm.
In embodiments of the invention, the ratio G/P of the chirality pitch P (Pitch) of the clearance G between described upper electrode substrate and described lower electrode substrate and 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 established between upper electrode substrate of the present invention, lower electrode substrate contains and has optically active liquid crystal molecule, use lower driving voltage that the liquid crystal molecule in electric field just can be made to obtain larger power, rotate rapidly, can meet the request for utilization of display to low driving voltage, and described liquid crystal media have lower viscosity and higher cleaning point.
The optically active substance that the present invention is represented by mutual-through type (I) carries out combination experiment, by with the comparing of reference examples, determine the liquid crystal media of the compound comprising general formula (I), when being applied to VA display mode, VA pattern can be made to have, and 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 selected of the test of described response time data is thick is 4 μm.
Accompanying drawing explanation
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.It should be noted that, the following examples are example of the present invention, are only used for the present invention is described, and are not used for limiting the present invention.When not departing from purport of the present invention or scope, other combination and the various improvement in design of the present invention can be carried out.
The liquid crystal display that following embodiment adopts is VA-TFT liquid crystal display, the thick d=4 μm of box, is made up of parts such as polarizer (polaroid), electrode base boards.This display device is normal white mode, and when namely not having voltage difference to put between row and column electrode, observer observes the pixel color of white.Polarizer axes up and down on substrate is 90 degrees to each other 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) as shown in Figure 1, comprising: upper electrode substrate (2), lower electrode substrate (3) and liquid crystal layer (4); Wherein, liquid crystal layer (4) is between upper electrode substrate (2) and lower electrode substrate (3); Liquid crystal layer comprises liquid crystal media, has liquid crystal molecule (5) in liquid crystal media.
For ease of expressing, in following embodiment, the coded representation of unit structure listed by table 1 of liquid-crystal compounds:
The unit structure code of table 1 liquid-crystal compounds
For following structure:
Coded representation in this structure table 1: then can be expressed as 3PTG1(2F) OP3, and for example:
Then can be expressed as nCPTPOm, the n in code represents the C atomicity of left end alkyl, and such as n is " 3 ", namely represents that this alkyl is-C
3h
7; C in code represents cyclohexyl; O represention oxygen atom in code; P in code represents phenylene; M in code represents the C atomicity of right-hand member alkyl, and such as m is " 1 ", namely represents that the alkyl of right-hand member is-CH
3.
In embodiment, the code name of writing a Chinese character in simplified form of each test event is expressed as:
Cp (DEG C) cleaning point (DEG C, to row-isotropic phase transition temperature)
η fluid viscosity (mPa*s, 20 DEG C)
Δ n optical anisotropy (589nm, 20 DEG C)
Δ ε dielectric anisotropy (1KHz, 25 DEG C)
V
0: driving voltage (1KHZ, 20 DEG C, VA testing cassete)
Toff: OFF state response time (ms, 25 DEG C)
Each composition adopted below in an example, all can be synthesized by known method, or be obtained by commercial sources.These synthetic technologys are conventional, and each liquid-crystal compounds that obtains meets electrical type compound standard after tested.
Reference examples
Liquid crystal display device is formed according to Fig. 1.
Be mixed with the liquid crystal media M-1 of reference examples by each compound listed in table 2 and percent by weight, the liquid crystal layer (4) be filled between liquid crystal display two substrates carries out performance test, and test data is as shown in the table:
The formula of table 2 liquid crystal media M-1 and test performance thereof
This potpourri has suitable Δ n numerical value, the high Δ ε numerical value of appropriateness and the low fluid viscosity of appropriateness.Therefore it is applicable to
Adopt in the display of VA display mode operation.
Embodiment 1
Liquid crystal display device is formed with reference examples 1.
In the liquid crystal media M-1 of reference examples 1, add optically active substance involved in the present invention by weight ratio listed in table 3, it is filled in liquid crystal layer (4) between liquid crystal display two substrates and carries out performance test, and test data is as shown in the table:
Table 3 liquid crystal media formula and test performance thereof
By the optically active substance using general formula (I) to represent, make liquid crystal media when keeping photoelectric parameter substantially constant, obtain lower driving voltage, and improve response speed, be therefore suitable for very much adopting in the liquid crystal display of VA display mode operation.
Claims (9)
1. a liquid crystal display device, is characterized in that, described liquid crystal display device comprises:
One upper electrode substrate;
One lower electrode substrate;
And a liquid crystal layer between described upper electrode substrate and described lower electrode substrate, it is negative liquid crystal media that described liquid crystal layer comprises a kind of dielectric constant anisotropy, and described liquid crystal media comprises at least one optical activity component;
Wherein, in described liquid crystal media orientation and the described upper electrode substrate of liquid crystal molecule or described lower electrode substrate place plane substantially vertical;
Wherein, described optical activity component is selected from the compound with general formula I:
Wherein,
R
1be selected from the group be made up of with the alkenyl or alkenyloxy with 2-12 carbon atom the alkyl or alkoxy with 1-12 carbon atom, wherein, at described R
1and R
2in one or more-CH
2-can be substituted by-CH=CH-,-O-,-CH=CF-,-CF=CH-,-CF=CF-,-CO-O-or-O-CO-independently of one another, its prerequisite is that oxygen atom is not directly connected to each other;
R
2* be selected from the chiral radicals of 1-20 carbon atom, described chiral radicals can be unsubstituted or monosubstituted or polysubstituted by F, Cl, Br or CN, wherein one or more non-conterminous-CH
2-can be substituted by-O-,-CO-,-COO-,-OCO-,-OCOO-,-CH=CH-and-C ≡ C-independently of one another, its prerequisite is that oxygen atom is not directly connected; 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 polymerizable chiral group;
Z
1, Z
2independent of each otherly to 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-,-OCO-CH=CH-and singly-bound composition group;
X is 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-,-C ≡ C-and singly-bound composition group;
Ring A, ring B and ring C are identical or different, are selected from by Isosorbide-5-Nitrae-cyclohexylidene, 1 independently of one another, 4-phenylene, Isosorbide-5-Nitrae-cyclohexadienylidene, Isosorbide-5-Nitrae-Ya two ring [2,2,2] octyl group, 1,3-dioxane-4,5-bis-base, pyridine-2,5-bis-base, pyrimidine-2,5-bis-base, naphthalene-2,6-bis-base, decahydronaphthalene-2, the group of the group composition in 6-bis-base and naphthane-2,6-bis-base; Wherein, selectively, one or more hydrogen atom in described ring A, ring B and ring C is by-F ,-Cl ,-CN ,-CF
3,-OCF
3,-CH
2f ,-OCH
2f ,-OCH
3or-CH
3replace, or one or two the non-conterminous-CH in described ring A, ring B and ring C
2-can by-O-,-S-,-CF
2-or-CO-is alternative, and prerequisite is that-O-,-S-are not directly connected to each other, or 1 ~ 2-CH=in described ring A, ring B and ring C can be substituted by-N=;
N is 0,1,2 or 3.
2. liquid crystal display device according to claim 1, is characterized in that, the angle theta in described liquid crystal media between the orientation of liquid crystal molecule and described upper electrode substrate or described lower electrode substrate place plane is: 80 °≤θ≤90 °.
3. liquid crystal display device according to claim 1, is characterized in that, the compound of described general formula I is selected from the group be made up of general formula I-1 to the compound of general formula I-18:
4. the liquid crystal display device according to any one of claim 1-3, is characterized in that, described optically active substance accounts for the 0.01%-5% of described liquid crystal media general assembly (TW).
5. liquid crystal display device according to claim 4, is characterized in that, described optically active substance accounts for the 0.05%-3% of described liquid crystal media general assembly (TW).
6. liquid crystal display device according to claim 1, is characterized in that, the chirality pitch P of described liquid crystal media is 1 μm≤P≤100 μm.
7. liquid crystal display device according to claim 6, is characterized in that, the chirality pitch P of described liquid crystal media is 2 μm≤P≤40 μm.
8. liquid crystal display device according to claim 7, is characterized in that, the ratio G/P of the chirality pitch P of the clearance G between described upper electrode substrate and described lower electrode substrate and described liquid crystal media is 0.005≤G/P≤0.5.
9. liquid crystal display device according to claim 8, is characterized in that, the ratio G/P of the chirality pitch P of the clearance G between described upper electrode substrate and described lower electrode substrate and described liquid crystal media is 0.01≤G/P≤0.25.
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| CN103113900B (en) * | 2013-02-01 | 2015-02-04 | 江苏和成显示科技股份有限公司 | Polymer stabilized alignment type liquid crystal composition and application thereof |
| WO2016208411A1 (en) * | 2015-06-24 | 2016-12-29 | Dic株式会社 | Nematic liquid-crystal composition and liquid-crystal display element including same |
| KR20190009317A (en) * | 2016-05-17 | 2019-01-28 | 메르크 파텐트 게엠베하 | Optical modulation element |
| CN107522600B (en) * | 2016-06-20 | 2020-12-15 | 江苏和成显示科技有限公司 | Ethylene oxide group-containing compound, composition and application thereof |
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| CN1475547A (en) * | 2002-07-06 | 2004-02-18 | Ĭ��ר���ɷ�����˾ | Liquid crystal medium |
| CN101017286A (en) * | 2006-02-08 | 2007-08-15 | 株式会社日立显示器 | Liquid crystal display device |
| KR100844112B1 (en) * | 2002-06-28 | 2008-07-04 | 디아이씨 가부시끼가이샤 | Method of increasing helical twisting power, optically active compound, liquid crystal composition containing the same, and liquid crystal display device |
| WO2008105286A1 (en) * | 2007-02-28 | 2008-09-04 | Chisso Corporation | Pentacyclic liquid crystal compound having cf2o bonding group, liquid crystal composition and liquid crystal display |
| CN102262323A (en) * | 2007-09-28 | 2011-11-30 | 斯坦雷电气株式会社 | Liquid crystal display unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100844112B1 (en) * | 2002-06-28 | 2008-07-04 | 디아이씨 가부시끼가이샤 | Method of increasing helical twisting power, optically active compound, liquid crystal composition containing the same, and liquid crystal display device |
| CN1475547A (en) * | 2002-07-06 | 2004-02-18 | Ĭ��ר���ɷ�����˾ | Liquid crystal medium |
| CN101017286A (en) * | 2006-02-08 | 2007-08-15 | 株式会社日立显示器 | Liquid crystal display device |
| WO2008105286A1 (en) * | 2007-02-28 | 2008-09-04 | Chisso Corporation | Pentacyclic liquid crystal compound having cf2o bonding group, liquid crystal composition and liquid crystal display |
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Address after: 212212 Yangtze River bridge, Jiangsu, Yangzhong, Yangzhong on the eastern side of the road Patentee after: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. Address before: 212212 Yangtze River bridge, Jiangsu, Yangzhong, Yangzhong on the eastern side of the road Patentee before: Jiangsu Hecheng Display Technology Co.,Ltd. |
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Address after: 2/F, Sino Japan Cooperation Innovation Park, No. 16 Zidan Road, Qinhuai District, Nanjing, Jiangsu Province, 210014 Patentee after: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. Address before: 212212 East Side of Yangzhong Yangtze River Bridge, Zhenjiang City, Jiangsu Province Patentee before: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. |