KR900700564A - Improved Liquid Crystal Mixture - Google Patents

Abstract

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Improved Liquid Crystal Mixture

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Claims (15)

Operating in a high multiple mode, having a high contrast, having a small elastic modulus ratio K ₃ / K ₁ , but less than 0.9 and a Δεε ₂ ratio up to +0.3, at least three of the following liquid crystal materials; (a) at least 10% by weight of a first liquid crystal material comprising at least one liquid crystal compound represented by the following general formula; (Wherein R ¹ is a group R or OR; R ² is R or OR, R is each independently a straight chain alkyl group having 12 or less carbon atoms, wherein one or two non-adjacent CH ₂ groups are -O- and / Or -CH = CH-, two oxygen atoms do not directly bond, A is 1,4-phenylene or trans-1,4-cyclohexylene, Z ¹ is -CO-O -, -O-CO-, -CH ₂ -O-, -OCH _2- , -CH ₂ CH ₂ -or a single bond, Q ¹ is 1,4-phenylene or trans-1,4-cyclohexylene And m is 0,1 or 2) (b) less than 10% by weight of a second liquid crystal material comprising at least one liquid crystal compound having pronounced static anisotropy (Δε ≧ + 3); And (c) a liquid crystal mixture comprising less than 90% by weight of a third liquid crystal material containing at least one liquid crystal compound having negative or nearly zero dielectric anisotropy, wherein the twisted nematic liquid crystal display device comprises: (1) a first The liquid crystal material contains at least one liquid crystal compound represented by the following general formulas (Ia-2: b) to (Ia-2; i), (Wherein R ¹ is a group R or OR; R ² is R or OR, R is each independently a straight chain alkyl group having 12 or less carbon atoms, wherein one or two non-adjacent CH ₂ groups are -O- and And / or -CH = CH-, and the two oxygen atoms do not directly bond with each other) and / or (2) the third liquid crystal material is represented by the general formulas (IIId) to (IIIh), (III6) to ( An improved liquid crystal mixture containing at least one liquid crystal compound represented by III15) and / or (III16) and (III17). Wherein R ¹¹ , R ¹³ , R ¹⁵ and R ¹⁸ are each independently R, R ⁹ , R ¹⁰ , R ¹² , R ¹⁴ , R ¹⁶ and R ¹⁷ are each independently R or OR, and R is Straight chain alkyl groups having up to 12 carbon atoms, wherein one or two non-adjacent CH ₂ groups may be substituted with -O- or -CH = CH-, and the two oxygen atoms do not directly bond with each other and A ⁴ is 1,4- Cyclohexenylene) Wherein R ²⁹ , R ³¹ , R ³³ , R ³⁵ , R ³⁷ , R ³⁹ , R ⁴⁰ , R ⁴¹ , R ⁴³ , R ⁴⁵ , R ⁴⁷ and R ⁴⁸ are each independently R and R ³⁰ , R ³² , R ³⁴ , R ³⁸ , R ⁴² , and R ⁴⁴ are each independently R or OR, and R is independently at each occurrence a straight chain alkyl group having 12 or less carbon atoms, wherein one or two non-adjacent CH ₂ groups are -O Or -CH = CH- and two oxygen atoms do not bond directly to each other and A ⁴ is 1,4-cyclohexenylene) (Wherein R ⁴⁹ , R ⁵⁰ , R ⁵¹ and R ⁵² are each R and R is independently at each occurrence a straight chain alkyl group having 12 or less carbon atoms, wherein one or two non-adjacent CH ₂ groups are -O- or- May be substituted by CH═CH— and the two oxygen atoms do not bond directly to each other) An improved liquid crystal mixture according to claim 1 in the device which operates at the minimum permeability of the first molar and the terry. 3. The improved liquid crystal mixture of claim 2, wherein the total light specific curve is at least sharp at the minimum transmission of the second posterior terry. 4. The improved liquid crystal mixture of claim 3, wherein the sharpness of the particular curve at the first minimum is greater than that at the second minimum. The improved liquid crystal mixture of claim 1 wherein 2K ₃ / K ₁ is 0.4 to 0.9 and Δε / ε is 0.4 to 0.3. The improved liquid crystal mixture of claim 1 wherein K ₃ / K ₁ is 0.2 to 0.75 and Δε / ε is 0.1 to 0.3. The improved liquid crystal mixture of claim 1 wherein the liquid crystal mixture comprises at least five components. The improved liquid crystal mixture according to claim 1, wherein the first liquid crystal material comprises at least one liquid crystal compound represented by general formula (Ia). The improved liquid crystal mixture according to claim 1, wherein the second liquid crystal material comprises at least one liquid crystal compound represented by general formulas (IIa) to (IId). Wherein X is hydrogen or fluorine, Y is cyano, trifluoromethoxy or fluorine, r is 0 or 1 and R is independently a straight chain alkyl group of 12 or less carbon atoms in each case, wherein one or two Non-adjacent CH ₂ groups may be substituted with —O— or —CH═CH—, and the two oxygen atoms do not bond with each other). The improved liquid crystal mixture according to claim 1, wherein the third liquid crystal material comprises a liquid crystal compound having dielectric anisotropy -1 to +1. The improved liquid crystal mixture according to claim 1, wherein the third liquid crystal material comprises at least one liquid crystal compound represented by general formulas (IIIa) to (IIIc). (Wherein R ³ is R; R ⁴ is R or OR) (Wherein R ⁵ is R; R ⁶ is R or OR) (Wherein R ⁷ is R; R ⁸ is R or OR, and R is independently at each occurrence a straight-chain alkyl group having 12 or less carbon atoms, wherein one or two non-adjacent CH ₂ groups are -O- or -CH = CH-, and the two oxygen atoms do not bond directly to each other). The improved liquid crystal mixture according to claim 1, wherein the third liquid crystal material also comprises at least one liquid crystal compound represented by the following general formula. (Wherein R ¹⁹ and R ²⁰ are each independently R) (Wherein R ²¹ and R ²² are each independently R) (Wherein, R ²³ and R ²⁴ are independently of each other R) (Wherein R ²⁵ and R ²⁶ are each independently R) (Wherein R ²⁷ and R ²⁸ are independently of each other R; n is 0 or 1, and R is independently a straight chain alkyl group having up to 12 carbon atoms in each case, wherein one or two non-adjacent CH ₂ groups are -O Or -CH = CH-, and two oxygen atoms do not directly bond with each other). The improved liquid crystal mixture according to claim 1, wherein the mixing ratio of the first liquid crystal material, the second liquid crystal material and the third liquid crystal material is at least 30 wt%, less than 10 wt% and less than 70 wt%, respectively. The improved liquid crystal mixture according to claim 8, wherein the mixing ratio of the first liquid crystal material, the second liquid crystal material and the third liquid crystal material is 30 to 65% by weight, less than 5% by weight and 35 to 70% by weight, respectively. A method of minimizing the dependence of contrast on the viewing angle of an all-optical display device based on a liquid crystal mixture and maximizing the sharpness of its feature curves to maximize its multiplexing capability, the method operates at the minimum transmission of the first molar and the terry Dependence of contrast on observation angle, wherein the mixture has a K ₃ / K ₁ ratio as little as possible but less than or equal to 0.9 and a Δε / ε ratio up to 0.3, wherein the mixture comprises at least three of the following liquid crystal materials: Minimize and simultaneously maximize multiplexing capacity; (a) at least 10% by weight of a first liquid crystal material comprising at least one liquid crystal compound represented by the following general formula; (Wherein R ¹ is a group R or OR; R ² is R or OR, R is independently at each occurrence a straight-chain alkyl group having 12 or less carbon atoms, wherein one or two non-adjacent CH ₂ groups are -O- and / Or -CH = CH-, two oxygen atoms do not directly bond with each other, A is 1,4-phenylene or trans-1,4-cyclohexylene, Z ¹ is -CO- O-, -OCO-, -CH ₂ -O-, -OCH _2- , -CH ₂ CH ₂ -or a single bond, Q ¹ is 1,4-phenylene or trans-1,4-cyclohexylene (m) 0,1 or 2) (b) less than 10% by weight of a second liquid crystal material comprising at least one liquid crystal compound having a pronounced anisotropy (Δε≥ + 3) before rectification and (c) parts or nearly zero dielectrics It contains less than 90% by weight of the third liquid crystal material containing at least one liquid crystal compound having anisotropy, (1) The first liquid crystal material comprises at least one liquid crystal compound represented by the following general formula (Ib) to (Ii) Contains; (Wherein R ¹ is a group R or OR, R ₂ is R or OR, R is independently at each occurrence a straight-chain alkyl group having 12 or less carbon atoms, wherein one or two non-adjacent CH ₂ groups are -O- and And / or -CH = CH-, and the two oxygen atoms do not directly bond with each other) and / or (2) the third liquid crystal material is represented by the general formulas (IIId) to (IIIh), (III6) to ( At least one liquid crystal compound represented by III15) and / or (III16) and (III17). Wherein R ¹¹ , R ¹³ , R ¹⁵ and R ¹⁸ are each independently R, R ⁹ , R ¹⁰ , R ¹² , R ¹⁴ , R ¹⁶ and R ¹⁷ are each independently R or OR, and R is Straight chain alkyl groups having up to 12 carbon atoms, wherein one or two non-adjacent CH ₂ groups may be substituted with -O- or -CH = CH-, and the two oxygen atoms do not directly bond with each other and A ⁴ is 1,4- Cyclohexenylene) Wherein R ²⁹ , R ³¹ , R ³³ , R ³⁵ , R ³⁷ , R ³⁹ , R ⁴⁰ , R ⁴¹ , R ⁴³ , R ⁴⁵ , R ⁴⁶ , R ⁴⁷ and R ⁴⁸ are each independently R and R ³⁰ , R ³² , R ³⁴ , R ³⁶ , R ³⁸ , R ⁴² , and R ⁴⁴ are each independently R or OR, and R is independently a straight chain alkyl group of up to 12 carbon atoms in each occurrence, wherein one or two non-adjacent CH ₂ group may be substituted with -O- or -CH = CH-, two oxygen atoms do not directly bond with each other, A ⁴ is 1,4-cyclohexenylene) (Wherein R ⁴⁹ , R ⁵⁰ , R ⁵¹ and R ⁵² are each R and R is independently a straight chain alkyl group having 12 or less carbon atoms, where one or two non-adjacent CH ₂ groups are -O- or -CH The two oxygen atoms which may be substituted by = CH- do not directly bond with each other) ※ Note: The disclosure is based on the initial application.