CN105602577B - Positive dielectric anisotropy liquid crystal composition and its liquid crystal display cells or liquid crystal display - Google Patents
Positive dielectric anisotropy liquid crystal composition and its liquid crystal display cells or liquid crystal display Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 97
- 239000000203 mixture Substances 0.000 title claims abstract description 37
- 150000001875 compounds Chemical class 0.000 claims abstract description 47
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 125000000217 alkyl group Chemical group 0.000 claims description 24
- 125000004432 carbon atom Chemical group C* 0.000 claims description 24
- 125000003342 alkenyl group Chemical group 0.000 claims description 8
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000002834 transmittance Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 2
- 125000001995 cyclobutyl group Chemical group [H]C1([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 2
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 2
- 125000005647 linker group Chemical group 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 125000000876 trifluoromethoxy group Chemical group FC(F)(F)O* 0.000 description 2
- 239000012963 UV stabilizer Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000002438 flame photometric detection Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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Abstract
The invention discloses a kind of positive dielectric anisotropy liquid crystal composition and the display element or display using the liquid-crystal composition, one or more formula I, formula II, general formula III compound are contained in liquid-crystal composition,
Description
Technical Field
The invention belongs to a liquid crystal compound, and particularly relates to a positive dielectric anisotropy liquid crystal composition and a liquid crystal display element or a liquid crystal display using the liquid crystal composition.
Background
Display is a process of converting electrical signals (data information) into visible light (visual information), and devices for performing Display, namely Man-Machine interfaces (MMI) and Flat Panel Displays (FPD), are the most popular Display devices at present. A Liquid Crystal Display (LCD) is the earliest developed and commercialized product among FPDs. Currently, Thin Film Transistor liquid crystal displays (TFT-LCDs) have become the mainstream product in LCD applications.
The development of the TFT-LCD goes through a long basic research stage, and after the large-scale production and commercialization are realized, the TFT-LCD product has the advantages of lightness, thinness, environmental protection, high performance and the like, and the larger the size is, the wider the application is. The TFT-LCD is widely applied to small-sized mobile phone screens, large-sized Notebook computers (Notebook PCs) or monitors (monitors), and large-sized liquid crystal televisions (LCDTVs). Early commercial TFT-LCD products basically used a Twisted Nematic (TN) type display mode, and the biggest problem was insufficient viewing angle.
The viewing angle problem of the LCD is determined by the operating principle of the liquid crystal itself. The liquid crystal molecular formula is rod-shaped, and different molecular arrangement modes correspond to different optical anisotropies. The smaller the included angle between incident light and liquid crystal molecules is, the smaller the birefringence is; conversely, the greater the birefringence. The included angles between the light rays entering the liquid crystal box at different angles from the normal direction of the display screen and the director of the liquid crystal molecules are different, so that the effective optical path difference delta nd is different at different viewing angles. The optimal optical path difference of the liquid crystal box is designed according to the direction vertical to the normal line of the box, for the light rays with oblique incidence, the minimum transmissivity is increased along with the increase of the included angle, and the contrast ratio is reduced. When the angle is large enough, contrast inversion may even occur.
At present, many methods for solving the viewing angle problem have been proposed such as: optical off-the-shelf (OCB), in-plane switching mode (IPS), fringe field switching mode (FFS), and multi-domain homeotropic alignment Mode (MVA).
They all have their own advantages and disadvantages, and the MVA mode has high contrast and fast response characteristics, but it requires one biaxial compensation film and two elliptical polarizers, and thus is expensive. The OCB mode is difficult to maintain stable control with ac voltage, the transmittance of R, G, B three monochromatic lights is different, and in the absence of field, the molecules in the liquid crystal cell are aligned in a direction parallel to the substrate, and in order to achieve a bend alignment, a voltage is applied to the cell for a few seconds for presetting, and then the alignment can be maintained at a lower voltage, which is inconvenient to use. Since the IPS mode and the FFS mode are simple to manufacture and have a wide viewing angle, they are the most attractive approaches capable of improving viewing angle characteristics and realizing large-area display.
The IPS mode may use a positive liquid crystal whose transmittance saturation voltage is lower than that of the negative liquid crystal and whose response speed is faster because the transmittance saturation voltage decreases with an increase in the absolute value of Δ, or a negative liquid crystal which is better than that of the positive liquid crystal, mainly due to a difference in rotation of the positive and negative liquid crystals under an electric field.
The liquid crystal composition dopes one or more negative liquid crystal monomers in IPS liquid crystal with positive dielectric anisotropy, and surprisingly discovers that by the doping mode,/and j £ of the liquid crystal can be increased under the condition of keeping the delta unchanged, wherein the delta ═/j, delta is dielectric anisotropy, the/is a dielectric constant in a direction parallel to a molecular axis, the j is a dielectric constant in a direction vertical to the molecular axis, the liquid crystal with the delta > 0 is positive liquid crystal, and the liquid crystal with the delta < 0 is negative liquid crystal.
Transmittance (transmittance). di-rection.DELTA./. according to the transmittance formula of IPS mode. (. oc.) indicates an inverse relationship). By doping the negative liquid crystal monomer into the IPS liquid crystal with positive dielectric anisotropy, the obtained liquid crystal composition can greatly improve the transmittance of liquid crystal display while keeping the advantages of quick response, low driving voltage, higher clearing point, lower rotational viscosity, proper optical anisotropy, proper dielectric anisotropy and the like of the positive IPS liquid crystal.
Disclosure of Invention
The invention aims to provide a positive dielectric anisotropy liquid crystal composition and a liquid crystal display element or a liquid crystal display using the liquid crystal composition. The obtained liquid crystal composition can maintain the advantages of fast response, low driving voltage, higher clearing point, lower rotational viscosity, proper optical anisotropy, proper dielectric anisotropy and the like of positive liquid crystal, and simultaneously greatly improve the transmittance of liquid crystal display.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a positive dielectric anisotropic liquid crystal composition characterized by: the liquid crystal composition comprises a first component consisting of one or more compounds shown in a general formula I, a second component consisting of one or more compounds shown in a general formula II, and a third component consisting of one or more compounds shown in a general formula III,
wherein,
R1、R11、R2respectively selecting one of linear alkyl with 1-5 carbon atoms, wherein any discontinuous-CH2-may be substituted by-O-,
R3、R4respectively selected from one of linear alkenyl with 2-6 carbon atoms,
L1、L2are each selected from H or F, and at least one of which represents F.
The technical scheme of the invention is further improved as follows: in the liquid crystal composition, the mass percentage of the first component is 1-45%, the mass percentage of the second component is 10-55%, and the mass percentage of the third component is 1-45%.
The technical scheme of the invention is further improved as follows: the compound shown in the general formula I is specifically a compound shown in formulas I1-I5,
the compound shown in the general formula II is specifically a compound shown in formulas II 1-II 2,
the compound shown in the general formula III is specifically a compound shown in formulas III 1-III 2,
wherein,
R11one of linear alkyl groups with 1-5 carbon atoms is selected, wherein any discontinuous-CH2-may be substituted by-O-,
R2one of linear alkyl groups with 1-5 carbon atoms is selected, wherein any discontinuous-CH2-may be substituted by-O-,
R4one selected from linear alkenyl groups having 2 to 6 carbon atoms.
Preferably, the compound shown in the general formula I is a compound shown in formulas I1-1 to I5-5,
the compound shown in the general formula II is specifically a compound shown in formulas II 1-II 2-5,
the compound shown in the general formula III is a compound shown in formulas III 1-1 to III 2-2,
the technical scheme of the invention is further improved as follows: the liquid crystal composition also comprises a fourth component composed of a compound shown in a general formula IV, the mass percentage of the fourth component in the liquid crystal composition is 0-15%,
wherein,
R5one selected from a C1-5 linear alkyl group and a C2-5 linear alkenyl group,
R6one selected from linear alkyl groups having 1 to 5 carbon atoms.
The technical scheme of the invention is further improved as follows: the compound shown in the general formula IV is a compound shown in formulas IV 1-IV 8,
wherein,
R51one selected from linear alkyl groups having 1 to 5 carbon atoms,
R6one selected from linear alkyl groups having 1 to 5 carbon atoms.
Preferably, the compound shown in the general formula IV is a compound shown in formulas IV 1-1 to IV 8-5,
the liquid crystal composition also comprises a fifth component composed of a compound shown as a general formula V, wherein the mass percentage of the fifth component in the liquid crystal composition is 0-10%,
wherein,
R7one selected from a C1-5 linear alkyl group and a C2-5 linear alkenyl group,
R8one selected from linear alkyl groups having 1 to 5 carbon atoms.
The technical scheme of the invention is further improved as follows: the compound shown in the general formula V is a compound shown in formulas V1-V5,
wherein,
R71one selected from linear alkyl groups having 1 to 5 carbon atoms,
R8one selected from linear alkyl groups having 1 to 5 carbon atoms.
Preferably, the compound shown in the general formula V is a compound shown in formulas V1-1 to V5-2,
the technical scheme of the invention is further improved as follows: the liquid crystal composition also comprises a sixth component composed of a compound shown in a general formula VI, and the mass percentage of the sixth component in the liquid crystal composition is 0-45%.
Wherein,
R9one selected from linear alkyl groups having 1 to 5 carbon atoms, and R9One CH in2Can be replaced by cyclopentyl, cyclobutyl, cyclopropyl;
each independently represents: one of (a) and (b);
a represents 1, 2.
Preferably, the compound shown in the general formula VI is a compound shown in a formula VI 1-VI 3,
r9 is selected from one of linear alkyl with 1-5 carbon atoms, and one CH2 in R9 can be replaced by cyclopentyl, cyclobutyl and cyclopropyl.
More preferably, the compound shown in the general formula VI is a compound shown in a formula VI 1-VI 3-5,
the technical scheme of the invention is further improved as follows: in the liquid crystal composition, the mass percentage of the first component is 5-10%, the mass percentage of the second component is 30-50%, the mass percentage of the third component is 5-15%, the mass percentage of the fourth component is 5-15%, the mass percentage of the fifth component is 5-10%, and the mass percentage of the sixth component is 20-40%.
The invention also discloses a liquid crystal display element or a liquid crystal display containing the positive dielectric anisotropy liquid crystal composition, wherein the liquid crystal display element or the liquid crystal display is an active matrix display element or a display, a passive matrix display element or a display.
The liquid crystal composition disclosed by the invention has the advantages of quick response, low driving voltage, higher clearing point, lower rotational viscosity, proper optical anisotropy, proper dielectric anisotropy and the like of positive IPS liquid crystal, and the transmittance of liquid crystal display is greatly improved.
The liquid crystal composition disclosed by the invention has slightly different performances such as dielectric anisotropy delta, optical anisotropy delta n and nematic phase conversion of liquid crystal into liquid according to different proportions of the componentsThe transition temperature point CP and the low-temperature stability of the body are different, and the material can be applied to different types of display devices, but the same characteristic is that the rotational viscosity gamma of the material is gamma1Lower. The liquid crystal display device can realize quick response.
The liquid crystal medium provided by the invention can further comprise one or more of the following additives with the component concentration of 0.01-0.5 percent: UV stabilizers, antioxidants, chiral dopants, polymerization initiators.
The liquid-crystal compositions according to the invention are particularly suitable for use in liquid-crystal displays, in particular active-matrix-addressed displays and liquid-crystal displays of the TN, IPS, FFS type.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples, but the present invention is not limited to the following examples. The method is a conventional method unless otherwise specified. The starting materials are commercially available from the open literature unless otherwise specified. The percentages are not specifically indicated, and are all mass percentages.
In the following examples, CP represents the clearing point, and is measured directly by using a WRX-1S micro thermal analyzer, and the temperature rise rate is set to 3 ℃/min. Δ n denotes the optical anisotropy (589nm, 20 ℃), Δ denotes the dielectric anisotropy (25 ℃, 1KHz, HP4284A, 5.2 μm TN levorotatory box), γ1Indicating the rotational viscosity (mpas) at 20 ℃ and VHR (%) representing the charge retention rate (5V,60Hz,20 ℃), ρ (× 10)13Ω · cm) represents a resistivity (20 ℃), a tester of a voltage holding ratio VHR (%) and a resistivity ρ (× 10)13Ω · cm) were both TOYO06254 and TOYO6517 type liquid crystal physical property evaluation systems (test temperature 20 ℃, time 16ms, test cell 7.0 μm).
The liquid crystal monomer structure in the embodiment of the invention is represented by codes, and the code representation methods of the liquid crystal ring structure, the end group and the connecting group are shown in the following tables (I) and (II).
Table (one): corresponding code of ring structure
Table (ii): corresponding codes for end groups and linking groups
| Terminal and linking groups | Corresponding code |
| CnH2n+1- | n |
| CnH2n+1O- | nO |
| -OCF3 | OCF3 |
| -CF2O- | Q |
| -F | F |
| -CH2＝CH2- | V |
For example:is denoted as 3CCV1 and,
denoted 3BB (3F) B (3F,5F) QB (3F,5F) F.
Comparative example
Example 1
Example 2
Example 3
Example 4
As can be seen from the above comparative examples and examples 1, 2, 3 and 4: the liquid crystal composition provided by the invention obviously improves the transmittance of liquid crystal, and has higher clearing point and lower rotational viscosity gamma1Suitable optical anisotropy, and suitable dielectric anisotropy. The liquid crystal material is particularly suitable for TN, FFS and IPS modes with quick response and high transmittance.
Claims (5)
1. A positive dielectric anisotropic liquid crystal composition characterized by: the liquid crystal composition comprises a first component consisting of one or more compounds shown as a general formula I, a second component consisting of one or more compounds shown as a general formula II, a third component consisting of one or more compounds shown as a general formula III, 5-10% by mass of the first component, 30-50% by mass of the second component, and 5-15% by mass of the third component, and further comprises a fourth component consisting of a compound shown as a general formula IV, 5-15% by mass of the fourth component in the liquid crystal composition, and further comprises a fifth component consisting of a compound shown as a general formula V, 5-10% by mass of the fifth component in the liquid crystal composition, and 20-40% by mass of the sixth component in the liquid crystal composition,
wherein,
R1、R11、R2respectively selecting one of linear alkyl with 1-5 carbon atoms, wherein any discontinuous-CH2-may be substituted by-O-,
R3、R4respectively selected from one of linear alkenyl with 2-6 carbon atoms,
R5one selected from a C1-5 linear alkyl group and a C2-5 linear alkenyl group,
R6one selected from linear alkyl groups having 1 to 5 carbon atoms,
R7one selected from a C1-5 linear alkyl group and a C2-5 linear alkenyl group,
R8one selected from linear alkyl groups having 1 to 5 carbon atoms,
R9is selected from cyclopentyl;
each independently represents: one of (a) and (b);
a represents a group of 1, 2,
L1、L2are each selected from H or F, and at least one of which represents F.
2. The positive dielectric anisotropic liquid crystal composition according to claim 1, wherein: the compound shown in the general formula I is specifically a compound shown in formulas I1-I5,
the compound shown in the general formula II is specifically a compound shown in formulas II 1-II 2,
the compound shown in the general formula III is specifically a compound shown in formulas III 1-III 2,
wherein,
R11one of linear alkyl groups with 1-5 carbon atoms is selected, wherein any discontinuous-CH2-may be substituted by-O-,
R2one of linear alkyl groups with 1-5 carbon atoms is selected, wherein any discontinuous-CH2-may be substituted by-O-,
R4one selected from linear alkenyl groups having 2 to 6 carbon atoms.
3. The positive dielectric anisotropic liquid crystal composition according to claim 1, wherein: the compound shown in the general formula IV is a compound shown in formulas IV 1-IV 8,
wherein,
R51one selected from linear alkyl groups having 1 to 5 carbon atoms,
r6 is selected from one of linear alkyl groups with 1-5 carbon atoms.
4. The positive dielectric anisotropic liquid crystal composition according to claim 1, wherein: the compound shown in the general formula V is a compound shown in formulas V1-V5,
wherein,
R71one selected from linear alkyl groups having 1 to 5 carbon atoms,
R8one selected from linear alkyl groups having 1 to 5 carbon atoms.
5. A liquid crystal display element or a liquid crystal display comprising the positive dielectric anisotropic liquid crystal composition according to any one of claims 1 to 4, wherein: the liquid crystal display element or the liquid crystal display is an active matrix display element or a display, a passive matrix display element or a display.
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| AU5067298A (en) * | 1996-11-28 | 1998-06-22 | Chisso Corporation | Chlorobenzene derivatives, liquid-crystal composition, and liquid-crystal display elements |
| JP4161663B2 (en) * | 2002-09-27 | 2008-10-08 | チッソ株式会社 | Liquid crystalline compounds, liquid crystal compositions and liquid crystal display devices having difluoromethyl and trifluoromethyl groups on the benzene ring |
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