CN102775993B - Liquid crystal composition and display device containing same - Google Patents

Abstract

The invention provides a liquid crystal composition and application thereof. The liquid crystal composition comprises at least one compound of general formula (I), at least one compound of general formula (II), at least one compound of general formula (III) and at least one compound containing a -C is equivalent to C-group. The liquid crystal composition provided by the invention has faster response speed and good low-temperature storage stability. The invention also provides an active matrix liquid crystal display device containing the liquid crystal composition.

Description

Liquid-crystal composition and the display device that comprises this liquid-crystal composition

Technical field

The present invention relates to a kind of liquid-crystal composition, particularly there is the liquid-crystal composition of suitable optical anisotropy and dielectric anisotropy, faster response speed and good low temperature storage stability and the application in active matrix liquid crystal display device thereof about a kind of.

Background technology

Liquid crystal material is at a certain temperature, has not only had the mobility of liquid but also has had the mixture of anisotropic organic bar-shaped micromolecular compound of crystal.Liquid crystal material is mainly used as the dielectric medium in indicating meter, and its reason is that the optical property of this class material can change by the voltage applying.Electrooptics device based on liquid crystal is known in those skilled in the art, and such device is battery, DAP (aiming at the distortion of phase) battery, object/main body battery, the TN battery with twisted nematic structure, STN (STN Super TN type) battery, SBE (super birefringence effect) cell box OMI (optical mode interference) battery with dynamic scattering.

For liquid-crystal display, the liquid crystalline cpd and the liquid crystal media that possess good chemistry and thermostability, the good stability to electric field and electromagnetic radiation, suitable optical anisotropy, faster response speed and lower threshold voltage meet current needs.Because liquid crystal uses usually used as the mixture of various ingredients, dissolving each other each other between each component seems particularly important, and according to different battery types and Application Areas, liquid crystal must meet different requirements, as specific conductivity, dielectric anisotropy and optical anisotropy etc., but the shortcoming significantly existing is in the prior art the time of response of growing, and low resistivity and operating voltage are excessively high, as EP0673986, DE19528106, DE19528107.In addition, low temperature storage stability is poor is also the defect of existing many liquid crystal materials.

Disclosed a series of compounds with liquid crystal Jie phase do not comprise the monomeric compound that meets all these aspects requirements up to now, therefore, in liquid crystal material field, need to have the novel liquid crystalline compositions of improving performance.Especially, for many type useds, liquid-crystal composition must have suitable wide nematic phase range, suitable specific refractory power, dielectric anisotropy and low temperature storage stability.

Array liquid crystal display is known, can be used in the non-linear element of conversion alone of each pixel, for example, and active component (being transistor), thereby often have term " active matrix ".Array liquid crystal display has covered any matrix display that has integrated non-linear element,, except active matrix, has in addition passive element as the indicating meter of varistor or diode.The array liquid crystal display of this type is specially adapted to TV application (for example portable TV) or is suitable for the information display that does in automobile or aircraft structure.But array liquid crystal display has relatively low contrast gradient, relatively high dependence of angle and in these indicating meters, manufactures the difficulty of gray scale.

Therefore, be still starved of there is suitable optical anisotropy and dielectric anisotropy, the array liquid crystal display part of wider operating temperature range, short response time and good low temperature storage stability.

Summary of the invention

The object of the invention is to by the optimum combination to various liquid-crystal compositions and optimum ratio, a kind of liquid-crystal composition with suitable optical anisotropy and dielectric anisotropy, faster response speed and good low temperature storage stability is provided, and described liquid-crystal composition can not show the shortcoming of prior art material or at least only in significantly less degree, show above-mentioned shortcoming.Wherein, in liquid-crystal composition, the compound described in the logical formula IV of use can significantly make it have fast response speed.

In order to complete foregoing invention object, the invention provides a kind of liquid-crystal composition, it comprises the compound that meets following general structure I, II, III, IV, wherein:

(1) compound of at least one logical formula I

(2) compound of at least one logical formula II

(3) compound of at least one logical formula III

and

(4) compound of at least one contain-C ≡ C-group,

Wherein:

R ₁, R ₃, R ₄can be identical or different, be independently from each other by C ₁～C ₇alkyl or alkoxyl group, C ₂～C ₇thiazolinyl or the group of alkene oxygen base composition;

R ₂be selected from C ₂～C ₇thiazolinyl;

R ₅select free H, F, Cl, CN, C ₁～C ₇alkyl or alkoxyl group, C ₂～C ₇thiazolinyl or the group of alkene oxygen base composition, wherein, described C ₁～C ₇alkyl or alkoxyl group, C ₂～C ₇thiazolinyl or alkene oxygen base in one or more H can be replaced by F independently of one another;

L ₁, L ₂can be identical or different, be H or F independently of one another;

X selects free F, Cl, CN and OCF ₃the group of composition;

can be identical or different, be independently from each other by the group of composition, wherein, in one or more CH ₂can be substituted by O independently of one another, in one or more CH can be substituted by N independently of one another, and in one or more H can be replaced by F independently of one another; Wherein, can also be

A, b, m, n, p can be identical or different, is 0,1 or 2 independently of one another.The compound of preferred containing-C ≡ C-group provided by the invention is the compound that meets general structure (IV)

Wherein:

R ₆, R ₇select free H, F, Cl, CN, C ₁～C ₇alkyl or alkoxyl group, C ₂～C ₇thiazolinyl or the group of alkene oxygen base composition, wherein, described C ₁～C ₇alkyl or alkoxyl group, C ₂～C ₇thiazolinyl or alkene oxygen base in one or more H can be replaced by F independently of one another;

can be identical or different, be independently from each other by the group of composition;

C, d can be identical or different, are 0,1 or 2 independently of one another.

In embodiments of the invention, the compound of preferred described general formula (I) accounts for the 1%-80% of described liquid-crystal composition gross weight; The compound of described general formula (II) accounts for the 1%-50% of described liquid-crystal composition gross weight; The compound of described general formula (III) accounts for the 0.1%-30% of the gross weight of described liquid-crystal composition; And described in the compound of contain-C ≡ C-group account for the 1%-50% of described liquid-crystal composition gross weight.

In embodiments of the invention, the compound of preferred described general formula (I) accounts for the 1%-60% of described liquid-crystal composition gross weight; The compound of described general formula (II) accounts for the 1%-40% of described liquid-crystal composition gross weight; The compound of described general formula (III) accounts for the 0.1%-20% of described liquid-crystal composition gross weight; And described in the compound of contain-C ≡ C-group account for the 1%-40% of described liquid-crystal composition gross weight.

In embodiments of the invention, one or more compound in the group of the freely following compound composition of the compound of preferred described general formula (I) choosing:

and

Wherein:

R ₁select free C ₁～C ₅alkyl or alkoxyl group, C ₂～C ₅thiazolinyl or the group of alkene oxygen base composition.

In embodiments of the invention, one or more compound in the group of the freely following compound composition of the compound of preferred described logical formula II choosing:

and

Wherein:

R ₃select free C ₁～C ₅alkyl or alkoxyl group, C ₂～C ₅thiazolinyl or the group of alkene oxygen base composition.

In embodiments of the invention, one or more compound in the group of the freely following compound composition of the compound of preferred described logical formula III choosing:

and

Wherein:

R ₄select free C ₁～C ₅alkyl or alkoxyl group, C ₂～C ₅thiazolinyl or the group of alkene oxygen base composition.

In embodiments of the invention, one or more compound in the group of the freely following compound composition of compound choosing of contain-C ≡ C-group described in preferred:

and

Wherein:

R ₆select free C ₁～C ₅alkyl or alkoxyl group, C ₂～C ₅thiazolinyl or the group of alkene oxygen base composition.

One or more compounds in the group of the freely following compound composition of compound choosing of particularly preferred described general formula (I):

and

One or more compounds in the group of the freely following compound composition of compound choosing of described logical formula II:

and

One or more compounds in the group of the freely following compound composition of compound choosing of described logical formula III:

and

One or more compounds in the group of the freely following compound composition of compound choosing of described containing-C ≡ C-group:

and

The present invention is by above-claimed cpd is carried out to combination experiment, by with the comparison of reference examples, determined the liquid crystal media that comprises above-mentioned liquid-crystal composition, there is suitable optical anisotropy and dielectric anisotropy, fast time of response and low temperature storage stability.

As mentioned above, liquid-crystal composition of the present invention, has suitable optical anisotropy and dielectric anisotropy, lower rotary viscosity, faster response speed and low temperature storage stability.

In the present invention if no special instructions, described ratio is weight ratio, and all temperature are degree celsius temperature, and box that the test of described response time data is selected is thick is 7 μ m.

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 illustrating the present invention, and are not used for limiting the present invention.In the situation that not departing from purport of the present invention or scope, can carry out other combination and various improvement in design of the present invention.

The liquid-crystal display that following embodiment adopts is TN-TFT liquid crystal display, and the thick d=7 μ of box m is made up of parts such as polarizer (polaroid), electrode base boards.This display equipment is normal white mode, and while not having voltage difference to put between row and column electrode, viewer observes white pixel color.Polarizer axes up and down on substrate is 90 degrees to each other angle.Space between two substrates is full of optical liquid crystal material.

For ease of expressing, in following embodiment, the listed coded representation of table 1 for the unit structure of liquid crystalline cpd:

The unit structure code of table 1 liquid crystalline cpd

Taking following structure as example:

Coded representation in table 1 for this structure: can be expressed as 3PTGQP3, and for example:

Can be expressed as nCPTPm, the n in code represents the C atomicity of left end alkyl, and for example n is " 3 ", represents that this alkyl is-C ₃h ₇; C in code represents cyclohexyl; P in code represents phenylene; T in code represents alkynyl; M in code represents the C atomicity of right-hand member alkyl, and for example m is " 1 ", 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:

Δ n optical anisotropy (589nm, 20 DEG C)

Δ ε dielectric anisotropy (1KHz, 25 DEG C)

Cp(DEG C): clearing point (to row-isotropic phase transition temperature)

V ₉₀the character voltage (normal white mode) of saturation voltage=in the time of 90% relative contrast

V ₁₀the character voltage (normal white mode) of threshold voltage=in the time of 10% relative contrast

γ 1 reverses viscosity (mPa*s, at 20 DEG C)

K ₁₁elastic constant (" tiltedly exhibition ", the pN at 20 DEG C)

K ₂₂elastic constant (" distortion ", the pN at 20 DEG C)

K ₃₃elastic constant (" bending ", the pN at 20 DEG C)

T _{-30 DEG C}the low-temperature storage time (at-30 DEG C)

(△ n) for γ 1/ ²numerical value is less, and the time of response is shorter

Wherein, specific refractory power anisotropy use Abbe refractometer under sodium lamp (589nm) light source, 20 DEG C test; Measurement box is TN90 type, the thick 7 μ m of box.

V ₁₀test condition: C/1KHZ, JTSB7.0.

Time of response formula:

${\mathrm{\τ}}_{\mathrm{on}}=\frac{{\mathrm{\γ}1d}^2}{{\mathrm{\π}}^2{K}_1(\frac{V_{90}^2}{V_{10}^2}-1)}$

${\mathrm{\τ}}_{\mathrm{off}}=\frac{{\mathrm{\γ}1d}^2}{{\mathrm{\π}}^2{K}_1}$

$\mathrm{\τ}={\mathrm{\τ}}_{\mathrm{on}}+{\mathrm{\τ}}_{\mathrm{off}}=\frac{\mathrm{\γ}1d^2}{{\mathrm{\π}}^2{K}_1(\frac{V_{90}^2}{V_{10}^2}-1)}+\frac{\mathrm{\γ}1d^2}{{\mathrm{\π}}^2{K}_1}$

Wherein, elastic constant $K_1=[K_{11}+\left(\frac{K_{33}-2K_{22}}{4}\right)],$ Path difference u=Δ n*d is definite value, therefore suitably increase △ n value, is conducive to reduce the value of element gap d, thereby is beneficial to the improvement of time of response, therefore

${\mathrm{\τ}}_{\mathrm{on}}=\frac{\frac{\mathrm{\γ}1}{{\left(\mathrm{\Δn}\right)}^2}{u}^2}{{\mathrm{\π}}^2{K}_1(\frac{V_{90}^2}{V_{10}^2}-1)}$

${\mathrm{\τ}}_{\mathrm{off}}=\frac{\frac{\mathrm{\γ}1}{{\left(\mathrm{\Δn}\right)}^2}{u}^2}{{\mathrm{\π}}^2{K}_1}$

$\mathrm{\τ}={\mathrm{\τ}}_{\mathrm{on}}+{\mathrm{\τ}}_{\mathrm{off}}=\frac{\frac{\mathrm{\γ}1}{{\left(\mathrm{\Δn}\right)}^2}{u}^2}{{\mathrm{\π}}^2{K}_1(\frac{V_{90}^2}{V_{10}^2}-1)}+\frac{\frac{\mathrm{\γ}1}{{\left(\mathrm{\Δn}\right)}^2}{u}^2}{{\mathrm{\π}}^2{K}_1}$

(△ n) on time of response formula, to show as γ 1/ ²numerical value less, the time of response is shorter.

The each composition adopting in following embodiment,, also can synthesize by the method in appropriately combined Synthetic Organic Chemistry according to known method by present inventor.These synthetic technologys are conventional, and each liquid crystalline cpd that obtains meets electrical type compound standard after tested.About the method for introducing target end group, ring structure and conjugated group in starting raw material, be documented in organic synthesis (Organic Syntheses, John Wiley & Sons, Inc), organic reaction (Organic Reactions, John Wiley & Sons, in the publications such as Inc), comprehensive organic synthesis (Comprehensive Organic Synthesis, Pergamon Press), new experimental chemistry lecture (ball is kind).

According to the proportioning of each liquid-crystal composition of following examples regulation, prepare liquid-crystal composition.The preparation of described liquid-crystal composition is to carry out according to the ordinary method of this area, as take the modes such as heating, ultrasonic wave, suspension according to the rules ratio mix make.

Prepare and study the liquid-crystal composition providing in the following example.Composition and its performance parameter test result of each liquid-crystal composition are shown below.

Reference examples 1

Be mixed with reference examples liquid-crystal composition by each compound listed in table 2 and weight percentage, it is filled between liquid-crystal display two substrates and carries out performance test, and test data is as shown in the table:

Table 2 liquid-crystal composition formula and test performance thereof

Embodiment 1

Be mixed with liquid-crystal composition of the present invention by each compound listed in table 3 and weight percentage, it is filled between liquid-crystal display two substrates and carries out performance test, and test data is as shown in the table:

Table 3 liquid-crystal composition formula and test performance thereof

This liquid-crystal composition, compared with reference examples, has suitable specific refractory power anisotropy and dielectric anisotropy, and (△ n) for low rotary viscosity and significantly low γ 1/ ²value, its advantage is fast response speed, good display effect and low temperature storage stability, be applicable in display device.

Embodiment 2

Be mixed with liquid-crystal composition of the present invention by each compound listed in table 4 and weight percentage, it is filled between liquid-crystal display two substrates and carries out performance test, and test data is as shown in the table:

Table 4 liquid-crystal composition formula and test performance thereof

This liquid-crystal composition, compared with reference examples, has suitable specific refractory power anisotropy and dielectric anisotropy, and (△ n) for low rotary viscosity and significantly low γ 1/ ²value, its advantage is fast response speed, good display effect and low temperature storage stability, be applicable in display device.

Embodiment 3

Be mixed with liquid-crystal composition of the present invention by each compound listed in table 5 and weight percentage, it is filled between liquid-crystal display two substrates and carries out performance test, and test data is as shown in the table:

Table 5 liquid-crystal composition formula and test performance thereof

This liquid-crystal composition, compared with reference examples, has suitable specific refractory power anisotropy, dielectric anisotropy and elastic constant ratio, and (△ n) for low rotary viscosity and significantly low γ 1/ ²value, its advantage is fast response speed, good display effect and low temperature storage stability, be applicable in display device.

Embodiment 4

Be mixed with liquid-crystal composition of the present invention by each compound listed in table 6 and weight percentage, it is filled between liquid-crystal display two substrates and carries out performance test, and test data is as shown in the table:

Table 6 liquid-crystal composition formula and test performance thereof

This liquid-crystal composition, compared with reference examples, has suitable specific refractory power anisotropy and dielectric anisotropy, and (△ n) for low rotary viscosity and significantly low γ 1/ ²value, its advantage is fast response speed, good display effect and low temperature storage stability, be applicable in display device.

Embodiment 5

Be mixed with liquid-crystal composition of the present invention by each compound listed in table 7 and weight percentage, it is filled between liquid-crystal display two substrates and carries out performance test, and test data is as shown in the table:

Table 7 liquid-crystal composition formula and test performance thereof

This liquid-crystal composition, compared with reference examples, has suitable specific refractory power anisotropy and dielectric anisotropy, and (△ n) for low rotary viscosity and significantly low γ 1/ ²value, its advantage is fast response speed, good display effect and low temperature storage stability, be applicable in display device.

Embodiment 6

Be mixed with liquid-crystal composition of the present invention by each compound listed in table 8 and weight percentage, it is filled between liquid-crystal display two substrates and carries out performance test, and test data is as shown in the table:

Table 8 liquid-crystal composition formula and test performance thereof

This liquid-crystal composition, compared with reference examples, has suitable specific refractory power anisotropy and dielectric anisotropy, and (△ n) for low rotary viscosity and significantly low γ 1/ ²value, its advantage is fast response speed, good display effect and low temperature storage stability, be applicable in display device.

Claims (5)

1. for a liquid-crystal composition for Actire matrix display device, it is characterized in that, described liquid-crystal composition comprises:

(1) account for the compound of at least one logical formula I of 1%-60% of described liquid-crystal composition gross weight, the group that the freely following compound of compound choosing of described general formula (I) forms:

(2) account for the compound of at least one logical formula II of 1%-40% of described liquid-crystal composition gross weight, the group that the freely following compound of compound choosing of described general formula (II) forms:

and

(3) account for the compound of at least one logical formula III of 0.1%-20% of described liquid-crystal composition gross weight, the group that the freely following compound of compound choosing of described logical formula III forms:

and

and

(4) account for the compound of at least one contain-C ≡ C-group of 1%-40% of described liquid-crystal composition gross weight, described in the group that forms of the freely following compound of compound choosing of contain-C ≡ C-group:

and

Wherein:

R ₁, R ₃, R ₄can be identical or different, R ₁and R ₃be independently from each other by C ₁～C ₇alkyl or alkoxyl group, C ₂～C ₇thiazolinyl or the group of alkene oxygen base composition;

R ₄select free C ₁～C ₅alkyl or alkoxyl group, C ₂～C ₅thiazolinyl or the group of alkene oxygen base composition;

R ₆select free C ₁～C ₅alkyl or alkoxyl group, C ₂～C ₅thiazolinyl or the group of alkene oxygen base composition.

2. liquid-crystal composition according to claim 1, is characterized in that, one or more compounds in the group of the freely following compound composition of compound choosing of described general formula (I):

and

One or more compounds in the group of the freely following compound composition of compound choosing of described logical formula II:

and

One or more compounds in the group of the freely following compound composition of compound choosing of described logical formula III:

and

One or more compounds in the group of the freely following compound composition of compound choosing of described containing-C ≡ C-group:

and

3. liquid-crystal composition according to claim 2, is characterized in that, described liquid-crystal composition comprises:

Account for the compounds Ⅳ-1-2 of described liquid-crystal composition gross weight 7%;

Account for the compounds Ⅳ-5-2 of described liquid-crystal composition gross weight 8%;

Account for the compound III-6-2 of described liquid-crystal composition gross weight 5%;

Account for the compound III-5-2 of described liquid-crystal composition gross weight 10%;

Account for the compound III-15-2 of described liquid-crystal composition gross weight 2%;

Account for the chemical compounds I-1-2 of described liquid-crystal composition gross weight 55%;

Account for the compound ii-2-2 of described liquid-crystal composition gross weight 3%;

Account for the compound ii-7-2 of described liquid-crystal composition gross weight 5%; And

Account for the compound ii-7-1 of described liquid-crystal composition gross weight 5%.

4. the application in manufacture active-matrix device according to the liquid-crystal composition described in any one in claim 1-3.

5. an active matrix liquid crystal display device, described liquid crystal display device comprises the liquid-crystal composition described in any one in claim 1-3.