CN100339461C - Liquid crystal material compounding method - Google Patents

Abstract

The present invention relates to a liquid crystal material compounding method which is characterized in that the present invention comprises the following steps: the required threshold voltage value of the liquid crystal is calculated by using the optimal bias voltage method through the operating voltage (Vop), the duty ratio (DUTY) and the bias voltage ratio (BIAS) according to the formula Voff=Vop/b, b=1/BIAS, d=1/DUTY, and the data is substituted to the formula so as to obtain Voff; the value of the threshold voltage (Vth) is obtained according to the threshold voltage empirical formula Vth=Voff+0.02; the values of Vth 1 and Vth 2 are respectively obtained through tests according to any two liquid crystals of the existing liquid crystals (A, B, C, D, E and F); the values of Vth 1 and Vth 2 and the value of threshold voltage (Vth) are substituted to the linear equation: Vth 1*X%+Vth 2*Y%=Vth; meanwhile, the liquid crystals meet the formula of X%+Y%=100% so as to obtain the liquid crystal compound with the required liquid crystals of X% and Y%. The present invention has the advantages that the present invention provides ready-made liquid crystals which completely conform to the requirements, changes the situation that liquid crystal manufacturers often push out the products in a serial mode, flexibly satisfies the requirements of liquid crystal screen manufacturers, and has market competitive advantage and price advantage.

Description

The liquid crystal material matching method

Technical field

The present invention relates to a kind of liquid crystal material, relate in particular to a kind of liquid crystal material matching method that is used for liquid crystal display.

Background technology

Liquid crystal (Liquid Crystal) had both had the flowability of liquid, had the crystalline birefringence again, thereby was called liquid crystal, and it is one of base mateiral of liquid-crystal display (Liquid Crystal Display).In the manufacturing processed of LCD MODULE, be very crucial to the selection of liquid crystal material, the liquid crystal of different parameters performance or different proportionings can produce following influence to the liquid crystal display performance: 1. the influence of pair liquid crystal display background color; 2. to the influence of liquid crystal display show uniformity; 3. to the influence of liquid crystal display display effect; 4. can guarantee that liquid crystal display is effectively worked in normal voltage.Because the processing condition difference of each tame liquid crystal display manufacturers, mentality of designing also is not quite similar, so concerning liquid crystal material supplier, often can not provide satisfactory ready-made liquid crystal fully.In order to satisfy the needs of liquid crystal display manufacturers, liquid crystal manufacturer releases its product in the mode of series often, modal system is four bottles system and six bottles system, such system allows independently to change threshold voltage vt h: transmittance is 10% the magnitude of voltage and the difference Δ n of double refraction: unusual optical index poor with ordinary refraction index, four bottles system: have four bottles of liquid crystal, one group in twos, two bottles of liquid crystal in same group have identical (or very approaching) parameter.

Typical four bottles are as follows:

	Δn	Vth
			Liquid crystal A	0.130	1.1V
Liquid crystal B	0.130	2.3V
			Liquid crystal C	0.160	1.1V
Liquid crystal D	0.160	2.3V

Six bottles systems: have six bottles of liquid crystal, often on the basis of four bottles system, Vth divide more detailed.Typical six bottles are as follows:

	Δn	Vth
			Liquid crystal A	0.130	1.1V
Liquid crystal B	0.130	1.7V
			Liquid crystal C	0.130	2.3V
Liquid crystal D	0.160	1.1V
			Liquid crystal E	0.160	1.7V
Liquid crystal F	0.160	2.3V

Summary of the invention

The object of the present invention is to provide a kind of available liquid crystal that utilizes,, draw new liquid crystal compound with required threshold voltage vt h value by changing the per-cent of available liquid crystal.

For finishing above-mentioned purpose, the technical solution used in the present invention is a kind of liquid crystal material matching method, is characterized in that it comprises the following steps:

(1) wherein close the operating voltage Vop of voltage Voff according to Liquid Crystal Module according to threshold voltage experimental formula: Vth=Voff+0.02, dutycycle DUTY, bias voltage are calculated by bias voltage method formula than BIAS: $\mathrm{Voff}=\frac{\mathrm{Vop}}{b}\sqrt{\frac{d-1+{(b-2)}^2}{d}}$ B=1/BIAS wherein, d=1/DUTY is with data

The substitution formula can get: the Voff value, and must this threshold voltage vt h value;

(2) will choose two bottles in existing four bottles or six bottles of serial liquid crystal, test respectively must this threshold voltage vt h1, the Vth2 value, Vth1, Vth2 value and threshold voltage vt h value substitution linear equation: Vth1 * X%+Vth2 * Y%=Vth; And be that X%, Y% satisfy with liquid crystal content: X%+Y%=100% thus: required liquid crystal is the liquid crystal compound of X%, Y%;

(3) selecting thick d of box and double refraction rate variance Δ n, is that Δ n * d=Z obtains required path difference Z according to formula, and wherein Z is 0.8-0.85, is used to adjust the liquid crystal display contrast gradient;

(4) for the background color that makes liquid crystal display keeps homogeneous, interpolation pitch is 10 or 12 chiral additives.

The invention has the beneficial effects as follows, by changing the per-cent of existing liquid crystal, draw new liquid crystal with required threshold voltage vt h value, satisfactory ready-made liquid crystal fully is provided, changed liquid crystal manufacturer and often released its product, satisfied the needs of liquid crystal display manufacturers neatly, had the competitive edge and the price advantage in market in the mode of series.

Embodiment

A kind of liquid crystal material matching method is characterized in that it comprises the following steps:

(1) wherein close the operating voltage Vop of voltage Voff according to Liquid Crystal Module according to threshold voltage experimental formula: Vth=Voff+0.02, dutycycle DUTY, bias voltage are calculated by bias voltage method formula than BIAS: $\mathrm{Voff}=\frac{\mathrm{Vop}}{b}\sqrt{\frac{d-1+{(b-2)}^2}{d}}$ B=1/BIAS wherein, d=1/DUTY can get data substitution formula: the Voff value, must this threshold voltage vt h value;

(2) will choose two bottles in existing four bottles or six bottles of serial liquid crystal, test respectively must this threshold voltage vt h1, the Vth2 value, Vth1, Vth2 value and threshold voltage vt h value substitution linear equation: Vth1 * X%+Vth2 * Y%=Vth; And be that X%, Y% satisfy with liquid crystal content: X%+Y%=100% thus: required liquid crystal is the liquid crystal compound of X%, Y%;

(3) selecting thick d of box and double refraction rate variance Δ n, is that Δ n * d=Z obtains required path difference Z according to formula, and wherein Z is 0.8-0.85, is used to adjust the liquid crystal display contrast gradient;

(4) for the background color that makes liquid crystal display keeps homogeneous, interpolation pitch is 10 or 12 chiral additives.

In the process of preparation liquid crystal, mainly following liquid crystal parameter is adjusted:

1. for the background color that makes liquid crystal display keeps homogeneous, add a certain amount of chiral additives; The addition of chiral additives is by the type of chiral additives, distortion angle, and 10 or 12 chiral additives is generally added pitch and is in the thick common decision of box.

2. calculate the double refraction rate variance of liquid crystal.The double refraction rate variance Δ n of universal liquid crystal is all between 0.13 to 0.16 in the market, Δ n is typically chosen in 0.131 or 0.141 value in the use, the selection meeting of occurrence is different because the processing condition of manufacturers are different, according to formula be: Δ n*d=X wherein d is that box is thick, and Z is that the path difference optimum value is generally selected between 0.8 to 0.85.

3. promptly under the situation of a certain voltage of determining and drive condition, draw its needed threshold value, again by choosing two bottles in four bottles (or six bottles), obtain desired liquid crystal according to the mode of linear combination, the threshold value of this liquid crystal promptly satisfies condition.

As: operating voltage Vop:9V, dutycycle DUTY:1/80, bias voltage compares BIAS:1/9.Calculate the threshold voltage of its required liquid crystal by the optimal bias method:

$\mathrm{Von}=\frac{\mathrm{Vop}}{b}\sqrt{\frac{d-1+b^2}{d}},$ $\mathrm{Voff}=\frac{\mathrm{Vop}}{b}\sqrt{\frac{d-1+{(b-2)}^2}{d}}$ (b＝1/BIAS，d＝1/DUTY)

Data substitution formula can be got:

$\mathrm{Von}=\frac{9}{9}\sqrt{\frac{80-1+9^2}{80}}=1.414V,$ $\mathrm{Voff}=\frac{9}{9}\sqrt{\frac{80-1+{(9-2)}^2}{80}}=1.265V$

Product is mainly considered Voff, and then Von also satisfies when Voff satisfies, and rule of thumb formula gets:

Threshold voltage is: Vth=Voff+0.02=1.285V

Suppose certain type product, existing A, two bottles of liquid crystal of B, its threshold voltage (Vth) is respectively 1V after tested, 2V, the content of supposing required liquid crystal A so is x%, the content of required liquid crystal B is y%, is got by linear method:

Vth=1X x%+2X y%=1.285V, and x%+y%=100%

Can get x=0.715, y=0.285 thus

So required liquid crystal should be the mixture of 71.5% the A liquid crystal B liquid crystal in 28.5%.

Claims (1)

1. a liquid crystal material matching method is characterized in that it comprises the following steps:

(1) wherein close the operating voltage Vop of voltage Voff according to Liquid Crystal Module according to threshold voltage experimental formula: Vth=Voff+0.02, dutycycle DUTY, bias voltage are calculated by bias voltage method formula than BIAS: $\mathrm{Voff}=\frac{\mathrm{Vop}}{b}\sqrt{\frac{d-1+{(b-2)}^2}{d}}$ B=1/BIAS wherein, d=1/DUTY can get data substitution formula: the Voff value, must this threshold voltage vt h value;

(2) will choose two bottles in existing four bottles or six bottles of serial liquid crystal, test respectively must this threshold voltage vt h1, the Vth2 value, Vth1, Vth2 value and threshold voltage vt h value substitution linear equation: Vth1 * X%+Vth2 * Y%=Vth; And be that X%, Y% satisfy with liquid crystal content: X%+Y%=100% thus: required liquid crystal is the liquid crystal compound of X%, Y%;

(3) selecting thick d of box and double refraction rate variance Δ n, is that Δ n * d=Z obtains required path difference Z according to formula, and wherein Z is 0.8-0.85, is used to adjust the liquid crystal display contrast gradient;

(4) for the background color that makes liquid crystal display keeps homogeneous, interpolation pitch is 10 or 12 chiral additives.