WO2014003399A1 - Composition de cristaux liquides - Google Patents

Composition de cristaux liquides Download PDF

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WO2014003399A1
WO2014003399A1 PCT/KR2013/005573 KR2013005573W WO2014003399A1 WO 2014003399 A1 WO2014003399 A1 WO 2014003399A1 KR 2013005573 W KR2013005573 W KR 2013005573W WO 2014003399 A1 WO2014003399 A1 WO 2014003399A1
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liquid crystal
dielectric anisotropy
ferroelectric
nematic
nematic liquid
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PCT/KR2013/005573
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Korean (ko)
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김재훈
이유진
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한양대학교 산학협력단
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Priority claimed from KR1020120118692A external-priority patent/KR20140001071A/ko
Application filed by 한양대학교 산학협력단 filed Critical 한양대학교 산학협력단
Priority to CN201380044492.8A priority Critical patent/CN104685026B/zh
Priority to US14/411,367 priority patent/US20150191650A1/en
Publication of WO2014003399A1 publication Critical patent/WO2014003399A1/fr

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Definitions

  • the present invention relates to a liquid crystal composition, and more particularly, to a liquid crystal composition comprising a nematic liquid crystal and a ferroelectric liquid crystal.
  • Liquid crystal display devices are one of the flat panel display devices most widely used at present, and studies for high quality, high brightness, and large size are being actively conducted.
  • the structure of electrodes in the liquid crystal display device has been diversified and complicated for the high quality, high brightness and large size of the liquid crystal display device.
  • a driving voltage is applied to these electrodes, the arrangement of the liquid crystal molecules of the liquid crystal layer is changed by an applied electric field, and the arrangement of the liquid crystal molecules is uneven and unstable by the electrodes. Uneven and unstable arrangement of the liquid crystal molecules is caused by a problem of lowering the brightness of the liquid crystal display.
  • One technical problem to be solved of the present invention is to provide a liquid crystal composition in which the alignment state is uniform and stabilized.
  • the liquid crystal composition includes a negative nematic liquid crystal having negative dielectric anisotropy, a positive nematic liquid crystal having positive dielectric anisotropy, and a ferroelectric liquid crystal.
  • the ferroelectric liquid crystal in the mixture of the nematic liquid crystal and the ferroelectric liquid crystal having the positive dielectric anisotropy, may include 10% to 99% by weight.
  • the liquid crystal composition may further include a reactive mesogen material.
  • the liquid crystal composition 0.1% to 30% by weight of the mixture of the nematic liquid crystal and ferroelectric liquid crystal having the positive dielectric anisotropy, 0.01% to 3% by weight of the reactive mesogen material And nematic liquid crystals having% and excess of said negative dielectric anisotropy.
  • the nematic liquid crystal having negative dielectric anisotropy may include nematic liquid crystal molecules having negative dielectric anisotropy.
  • the nematic liquid crystal having negative dielectric anisotropy further comprises first base liquid crystal molecules, each of the first base liquid crystal molecules, the negative dielectric anisotropy It may include at least one selected from the group consisting of a liquid crystal molecule having a liquid crystal molecule having a positive dielectric anisotropy and a neutral liquid crystal molecule.
  • the nematic liquid crystal molecules having negative dielectric anisotropy may include a nematic liquid crystal molecule having a first negative dielectric anisotropy and a second negative different from the first negative dielectric anisotropy. Nematic liquid crystal molecules having dielectric anisotropy.
  • the nematic liquid crystal having positive dielectric anisotropy may include nematic liquid crystal molecules having positive dielectric anisotropy.
  • the nematic liquid crystal having positive dielectric anisotropy further includes second base liquid crystal molecules, wherein each of the second base liquid crystal molecules is a liquid crystal having negative dielectric anisotropy. Molecules, liquid crystal molecules having positive dielectric anisotropy, and neutral liquid crystal molecules.
  • the nematic liquid crystal molecules having the positive dielectric anisotropy the nematic liquid crystal molecules having a first dielectric anisotropy and a second amount different from the first positive dielectric anisotropy Nematic liquid crystal molecules having dielectric anisotropy.
  • the ferroelectric liquid crystal may include ferroelectric liquid crystal molecules.
  • the ferroelectric liquid crystal further comprises third base liquid crystal molecules, each of the third base liquid crystal molecules, liquid crystal molecules having the negative dielectric anisotropy, the positive dielectric anisotropy It may include at least one selected from the group consisting of a liquid crystal molecule having a neutral liquid crystal molecule.
  • the ferroelectric liquid crystal molecules may include a first ferroelectric liquid crystal molecule and a second ferroelectric liquid crystal molecule different from the first ferroelectric liquid crystal molecule.
  • the liquid crystal composition includes a non-ferroelectric liquid crystal and a ferroelectric liquid crystal.
  • the liquid crystal composition may include 0.1 wt% to 30 wt% of the ferroelectric liquid crystal.
  • the non-ferroelectric liquid crystal may include a nematic liquid crystal having negative dielectric anisotropy and a nematic liquid crystal having positive dielectric anisotropy.
  • the non-ferroelectric liquid crystal may include a nematic liquid crystal having the negative dielectric anisotropy.
  • the liquid crystal composition may include 70 wt% to 99.9 wt% of the nematic liquid crystal having the negative dielectric anisotropy and 0.1 wt% to 30 wt% of the ferroelectric liquid crystal.
  • the liquid crystal composition may further include a reactive mesogen material.
  • the liquid crystal composition has 0.1% to 30% by weight of the ferroelectric liquid crystal, 0.01% to 3% by weight of the reactive mesogen material and extra negative dielectric anisotropy. It may comprise a nematic liquid crystal.
  • the liquid crystal composition may include a nematic liquid crystal having positive dielectric anisotropy, a nematic liquid crystal having negative dielectric anisotropy, and a ferroelectric liquid crystal.
  • alignment uniformity and stability of liquid crystal molecules in the liquid crystal composition may be improved, thereby improving brightness of the liquid crystal display device.
  • 1 is a graph showing the electrical properties of the liquid crystal composition according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view for describing a liquid crystal display according to an exemplary embodiment of the present invention.
  • FIG. 3 is a plan view illustrating slit shapes of electrodes according to embodiments of the present invention.
  • 4A to 4E are graphs comparing the transmittances of the liquid crystal display devices of Examples 1 to 4 and the liquid crystal display devices of Comparative Examples 1 to 3.
  • 5A to 5D are graphs comparing the response speeds of the liquid crystal display devices of Examples 1 to 4 and the liquid crystal display devices of Comparative Examples 1 to 3.
  • FIG. 6A is a graph illustrating transmittances of the liquid crystal displays of Examples 5 to 8
  • FIG. 6B is a graph illustrating response speeds of the liquid crystal displays of Examples 5 to 8.
  • 7A to 7C and 8A to 8C are textures of the liquid crystal display of Comparative Examples 1, 3, and 9, respectively.
  • 9A and 9B are graphs showing the gray levels of the textures of 7a, 7b, 8a and 8b.
  • a film (or layer) is on another film (or layer) or substrate, it may be formed directly on another film (or layer) or substrate or a third film ( Or layers) may be interposed.
  • first, second, third, etc. are used to describe various regions, films (or layers), etc. in various embodiments of the present specification, these regions, films should not be limited by these terms. do. These terms are only used to distinguish any given region or film (or layer) from other regions or films (or layers). Therefore, the film quality referred to as the first film quality in one embodiment may be referred to as the second film quality in other embodiments.
  • first film quality in one embodiment
  • second film quality in other embodiments.
  • Each embodiment described and illustrated herein also includes its complementary embodiment. Portions denoted by like reference numerals denote like elements throughout the specification.
  • a liquid crystal composition includes a negative nematic liquid crystal having negative dielectric anisotropy, a positive nematic liquid crystal having positive dielectric anisotropy, and a ferroelectric liquid crystal ) May be included.
  • the liquid crystal composition may include a nematic liquid crystal having negative dielectric anisotropy of about 70% by weight to about 99.9% by weight.
  • the liquid crystal composition may further include a mixture of nematic liquid crystal and ferroelectric liquid crystal having dielectric anisotropy in an amount of about 0.1% to about 30% by weight.
  • the mixture of the positively anisotropic nematic liquid crystal and the ferroelectric liquid crystal includes a nematic liquid crystal having an amount of dielectric anisotropy of about 1% by weight to 90% by weight, and about 10% by weight to about 99% by weight of the ferroelectric liquid crystal. can do.
  • the ferroelectric liquid crystal in the liquid crystal composition may be in the range of about 0.01% to about 29.7% by weight.
  • the ferroelectric liquid crystal is about 0.01% by weight or less of the total amount of the liquid crystal composition, liquid crystal alignment of the liquid crystal composition may be unstable.
  • the ferroelectric liquid crystal exceeds about 29.7% by weight of the total amount of the liquid crystal composition, the viscosity of the liquid crystal composition may increase, resulting in a slow response time of the display device including the liquid crystal composition.
  • the ferroelectric liquid crystal may be about 10% by weight of the total amount of the liquid crystal composition.
  • exemplary materials of the nematic liquid crystal having negative dielectric anisotropy, the nematic liquid crystal having positive dielectric anisotropy and the ferroelectric liquid crystal will be described.
  • Exemplary materials described below do not limit the nematic liquid crystals having negative dielectric anisotropy, the nematic liquid crystals having positive dielectric anisotropy, and ferroelectric liquid crystals of the present invention.
  • nematic liquid crystals First, the characteristics of nematic liquid crystals will be briefly described, and examples of nematic liquid crystals having negative dielectric anisotropy and nematic liquid crystals having positive dielectric anisotropy will be classified.
  • Nematic liquid crystals form liquid crystals in which the elongated molecules of the liquid crystal have irregular positions of each other but their long axes are directed in a constant direction. Since each molecule of the nematic liquid crystal can freely move in the long axis direction, the viscosity is small and easily flows. Since the directions of the nematic molecules are substantially the same in the up and down directions, the polarization is canceled and generally does not exhibit ferroelectricity. In the direction perpendicular to the axial direction of the molecules of the liquid crystal, physical properties are very different. Therefore, nematic liquid crystal is a material having optical anisotropy.
  • nematic liquid crystal with negative dielectric anisotropy If the difference between the dielectric constant parallel to the axial direction and the dielectric constant perpendicular to the axial direction ( ⁇ ) is less than 0, it is called a nematic liquid crystal with negative dielectric anisotropy, and if greater than 0, it is called a nematic liquid crystal with positive dielectric anisotropy. .
  • the nematic liquid crystal having negative dielectric anisotropy may include nematic liquid crystal molecules having negative dielectric anisotropy.
  • the nematic liquid crystal molecules having negative dielectric anisotropy may be a single type.
  • the nematic liquid crystal molecules having negative dielectric anisotropy may be of different kinds from each other.
  • the nematic liquid crystal molecules having negative dielectric anisotropy may include liquid crystal molecules having negative dielectric anisotropy having a first dielectric constant and liquid crystal molecules having negative dielectric anisotropy having a second dielectric constant. In this case, the second dielectric constant may be different from the first dielectric constant.
  • the nematic liquid crystal having negative dielectric anisotropy may include nematic liquid crystal molecules having negative dielectric anisotropy and first base liquid crystal molecules.
  • Each of the first base liquid crystal molecules may include at least one selected from the group consisting of liquid crystal molecules having negative dielectric anisotropy, liquid crystal molecules having positive dielectric anisotropy and neutral liquid crystal molecules.
  • the nematic liquid crystal having negative dielectric anisotropy may include nematic liquid crystal molecules having one kind of negative dielectric anisotropy and first base molecules.
  • the nematic liquid crystal having negative dielectric anisotropy may include liquid crystal molecules having various kinds of negative dielectric anisotropy and first base liquid crystal molecules.
  • nematic liquid crystals having negative dielectric anisotropy will be described with examples.
  • the following materials may be used alone or in combination.
  • the negative liquid crystal having negative dielectric anisotropy may include a halogen group, a cyanide group, or an isocyanate group nematic liquid crystal.
  • the nematic liquid crystal having negative dielectric anisotropy may be used alone or in combination with a halogen group, a cyanide group, or an isocyanate group nematic liquid crystal.
  • the nematic liquid crystal having negative dielectric anisotropy may further include first base liquid crystal molecules.
  • the nematic liquid crystal having a halogen-based negative dielectric anisotropy may include a fluorine group, a chlorine group, or a bromine group material, and may have a single or polycyclic structure.
  • Nematic liquid crystals having a negative dielectric anisotropy of a halogen-based bicyclic structure may be represented by the following Chemical Formulas 1 and 2.
  • Nematic liquid crystals having a negative dielectric anisotropy of a halogen-based tricyclic structure may be represented by Chemical Formulas 3 to 6.
  • Nematic liquid crystals having a negative dielectric anisotropy of a halogen-based tetracyclic structure may be represented by Chemical Formulas 7 to 9.
  • Y represents hydrogen or halogen
  • R 1 represents alkyl having 1 to 15 carbon atoms, or alkenyl
  • R 2 represents 1 to 15 carbons Alkyl, alkenyl, or alkoxy having atoms (in R 1 , and R 2 , hydrogen may be replaced by CN, CF 3 , or halogen atoms)
  • the nematic liquid crystal having halogen negative dielectric anisotropy has a lateral fluorinated indane derivative and may be represented by the following Chemical Formula 10.
  • n 0 or 1.
  • the nematic liquid crystal having cyanide negative dielectric anisotropy may be represented by the following Chemical Formulas 11 to 13.
  • the negative liquid crystal having dielectric anisotropy may be a single substance or a mixture. According to an embodiment, the nematic liquid crystal mixture having negative dielectric anisotropy,
  • Liquid Crystal Component A consisting of at least one compound having a dielectric anisotropy of less than -1.5:
  • liquid crystal component B consisting of at least one compound having a dielectric anisotropy of -1.5 to +1.5:
  • the liquid crystal component A may include one or more compounds of Formulas 14 to 17.
  • the liquid crystal component B may include one or more compounds of Formulas 18 to 20.
  • the liquid crystal component B may be the first base liquid crystal molecules described above.
  • R 4 and R 5 are each independently alkyl, alkoxy, alkoxy alkyl, alkenyl or alkenyloxy having 1 to 15 carbon atoms. oxy), where hydrogen may be substituted by CN, CF 3 , or halogen atoms, and the —CH 2 — group is —CH ⁇ CH—, —O—, —CO—, —COO -, -OOC-, -O-OC-O- or -S- may be substituted), Y 1 represents hydrogen or halogen.
  • Chiral component C is available in a number of chiral dopants, such as the following examples.
  • the choice of dopant is not important by itself.
  • the nematic liquid crystal having positive dielectric anisotropy may include nematic liquid crystal molecules having positive dielectric anisotropy.
  • the nematic liquid crystal molecules having the positive dielectric anisotropy may be a single type.
  • the nematic liquid crystal molecules having the positive dielectric anisotropy may be of different kinds from each other.
  • the nematic liquid crystal molecules having positive dielectric anisotropy may include liquid crystal molecules having positive dielectric anisotropy having a first dielectric constant and liquid crystal molecules having positive dielectric anisotropy having a second dielectric constant. In this case, the second dielectric constant may be different from the first dielectric constant.
  • the nematic liquid crystal having positive dielectric anisotropy may include nematic liquid crystal molecules having positive dielectric anisotropy and second base liquid crystal molecules.
  • Each of the second base liquid crystal molecules may include at least one selected from the group consisting of liquid crystal molecules having negative dielectric anisotropy, liquid crystal molecules having positive dielectric anisotropy, and neutral liquid crystal molecules.
  • the nematic liquid crystal having a positive dielectric anisotropy may include nematic liquid crystal molecules having a kind of dielectric anisotropy and second basis molecules.
  • the nematic liquid crystal having positive dielectric anisotropy may include liquid crystal molecules having various kinds of dielectric anisotropy and second base liquid crystal molecules.
  • nematic liquid crystals having positive dielectric anisotropy will be described by listing examples.
  • the following materials may be used alone or in combination.
  • the nematic liquid crystal having a positive dielectric anisotropy may include a nematic liquid crystal having a positive dielectric anisotropy of a cyanide group, an isocyanate group, and a halogen group.
  • the nematic liquid crystal having the positive dielectric anisotropy may be used singly or in combination with the cyanide group, the isocyanate group, and the halogen-based nematic liquid crystal having the positive dielectric anisotropy.
  • the nematic liquid crystal having the positive dielectric anisotropy may further include second base liquid crystal molecules.
  • the nematic liquid crystal having positive dielectric anisotropy may have a bicyclic structure or a tricyclic structure.
  • the cyanated nematic liquid crystal of the bicyclic structure may be represented by Chemical Formula 21.
  • R 6 in formula 21 is alkenyl having 1 to 15 carbon atoms (wherein hydrogen may be replaced by CN, CF 3 , or halogen, and —CH 2 — group is —CH ⁇ May be optionally substituted by CH—, —O—, —CO—, —COO—, —OOC—, —O—OC—O—, or —S—. Specific examples of Formula 21 are shown below.
  • R 7 is H, CH 3 , C 2 H 5 or nC 3 H 7 .
  • the nematic liquid crystal having positive dielectric anisotropy of the tricyclic structure may be represented by Chemical Formula 22.
  • R 3 is as R 3 is unsubstituted or CN, CF 3, or halogen-alkyl (alkyl) having at least one carbon atom less than the 15-substituted one by (halogen) groups as defined in Formula 11 to 13, wherein One or more CH 2 groups in these alkyls may be replaced by —O—, —S—, —C ⁇ C—, —CH ⁇ CH—, —OC—O— or —O—CO—, L 1 and L 2 each independently is hydrogen or halogen (halogen) with each other.
  • Nematic liquid crystals having an isocyanate-based dielectric anisotropy can be represented by the following formula (23).
  • R 8 is C n H 2n + 1 O, C n H 2n + 1 , or C n H2 n-1 , wherein n is 1 to 15 and A is or , B is -CH 2 -CH 2 -or -C ⁇ C-, X 1 is hydrogen or halogen, m is 1, 2, 3, or 4. Specific examples of Formula 23 are shown next.
  • Nematic liquid crystals having a halogen-based positive dielectric anisotropy may include a fluorine-based or chlorine-based material and may have a single or polycyclic structure. Nematic liquid crystals having fluorine-based dielectric anisotropy may be represented by Chemical Formulas 24 to 27.
  • the nematic liquid crystal having positive dielectric anisotropy of the halogen series bicyclic structure may be represented by the following Chemical Formula 28.
  • N in the formulas is 1 to 15.
  • the nematic liquid crystal having positive dielectric anisotropy of the halogen-based tricyclic structure may be represented by Chemical Formulas 29 to 33.
  • R 12 is alkyl or alkenyl having 1 to 15 carbon atoms (wherein alkyl or alkenyl is unsubstituted or at least monosubstituted by CN, CF 3 , or halogen) And one or more -CH 2 -groups may be substituted by -O-), X 3 is -F, -Cl, -OCF 3 , -OCHF 2 , -OCH 2 F or -CF 3 .
  • Specific examples of the formula (29) are as follows.
  • R 12 is as defined above.
  • the nematic liquid crystal having positive dielectric anisotropy of the halogen-based tetracyclic structure may be represented by Chemical Formulas 34 to 36.
  • a nematic liquid crystal having a positive dielectric anisotropy containing a trisubstituted fluorine or cyanide group may be represented by the formula (37).
  • At least one of two R 14 and R 15 is an alkenyl group having up to 15 carbon atoms unsubstituted or at least monosubstituted by CN, CF 3 or halogen, and the other One can be an alkyl group having up to 15 carbon atoms unsubstituted or at least monosubstituted by halogen, CN, CF 3 or halogen, wherein one or more CH 2 groups of these groups are -O-, -S May be replaced by-, -C ⁇ C-, -OCO-, or -O-CO-. Specific examples of Formula 37 are shown next.
  • n and m are 1 to 10, preferably 1 to 5
  • o and p are each independently the same or different and are 0 to 10, preferably 0 to 5, provided that the sum of o + p is preferably Is 7 or less.
  • the nematic liquid crystals having said positive dielectric anisotropy can be a single substance or a mixture.
  • Nematic liquid crystal mixture having a positive dielectric anisotropy according to one embodiment,
  • liquid crystal component A consisting of one or more compounds having a dielectric anisotropy greater than +1.5
  • liquid crystal component consisting of one or more compounds having a dielectric anisotropy of -1.5 to +1.5
  • Liquid crystal component A may include one or more compounds of Formula 37.
  • Liquid crystal component B may include one or more compounds represented by Formula 38 below.
  • the liquid crystal component B may be the second base liquid crystal molecules described above.
  • Component C is cholesteryl nonanoate (CN), S-811, S-1011, S-2011 (Merck KGaA, Darmstadt, Germany) with multiple chiral dopants and CB15 (Pool, UK). Many chiral dopants are available, such as BDH). The choice of dopant is not important by itself.
  • R 16 and R 17 are each independently the same or different and each is an alkyl group having up to 15 carbon atoms which are unsubstituted or at least monosubstituted by CN, CF 3, or halogen, Wherein one or more CH 2 in these alkyl groups may be replaced by —O—, —S—, —C ⁇ C—, —CH ⁇ CH—, —OC—O— or —OCO—, wherein 1,4- The phenylene (1,4-phenylene) ring may be mono- or polysubstituted by fluorine independently of each other.
  • ferroelectric liquid crystals have spontaneous polarization even when an electric field is not applied, it is a kind of dielectric that is an electrically insulator, but unlike general dielectrics, dielectric polarization is not proportional to electric field, and the relationship between polarization and electric field It has the characteristic which shows the ideal with electric history. Ferroelectric liquid crystals have not only spontaneous polarization, but also physical properties in which spontaneous polarization is reversed by an electric field.
  • the ferroelectric liquid crystal may include ferroelectric liquid crystal molecules.
  • the ferroelectric liquid crystal molecules may be a single type.
  • the ferroelectric liquid crystal molecules may be of different kinds from each other.
  • the ferroelectric liquid crystal molecules may include a first ferroelectric liquid crystal molecule and a second ferroelectric liquid crystal molecule. In this case, the second ferroelectric liquid crystal molecules may be different from the first ferroelectric liquid crystal molecules.
  • the ferroelectric liquid crystal may include ferroelectric liquid crystal molecules and third base liquid crystal molecules.
  • Each of the third base liquid crystal molecules may include at least one selected from the group consisting of liquid crystal molecules having negative dielectric anisotropy, liquid crystal molecules having positive dielectric anisotropy, and neutral liquid crystal molecules.
  • the ferroelectric liquid crystal may include one type of ferroelectric liquid crystal molecules and third base molecules.
  • the ferroelectric liquid crystal may include ferroelectric liquid crystal molecules different from each other and third base molecules.
  • ferroelectric liquid crystal will be described by listing examples.
  • the following materials may be used alone or in combination.
  • the ferroelectric liquid crystal may be chiral.
  • the ferroelectric liquid crystal may be a fluorine chiral end ferroelectric liquid crystal, a chiral allyl ester ferroelectric liquid crystal, a center core polyring chiral ferroelectric liquid crystal, or a smear chiral ( smetic chiral) ferroelectric liquid crystal and the like.
  • the ferroelectric liquid crystal may be a banana shape ferroelectric liquid crystal.
  • the ferroelectric liquid crystals include fluorine chiral end ferroelectric liquid crystals, chiral allyl ester ferroelectric liquid crystals, center core polyring chiral ferroelectric liquid crystals, and smetic chiral ferroelectric liquid crystals. Liquid crystals and banana shape ferroelectric liquid crystals may be used alone or in combination.
  • the ferroelectric liquid crystal may further include third base liquid crystal molecules.
  • the fluorine-based chiral terminal ferroelectric liquid crystal may be represented by the following Chemical Formula 39.
  • X 4 , X 5 , X 6 and X 7 are each independently CF 3 , CF 2 H , CFH 2 , halogen, alkyl or alkoxy, and C and D are independently Phenyl, mono-fluorophenyl, di-fluorophenyl, or cyclo-hexyl, E is independently a single bond, COO, OOC, and C ⁇ C Is selected from at least one of E is a single bond, q is 0 or 1, and R 18 is a terminal group of the formula (40).
  • Z is O, (CH 2 ) 1 O, or (CH 2 ) 2 O
  • J and M are independently selected from hydrogen, alkyl of 1 to 15 carbon atoms
  • W is a carbon atom 1 to 15 straight or branched alkyl chains, each of J, M and W different
  • R 19 represents alkenyl, alkenyloxy, alkynyl containing from 1 to 15 carbon atoms ), Or alkynoxy.
  • the chiral aryl ester liquid crystal may be represented by Chemical Formula 41.
  • Q represents a alkyl group substituted with alkyl or halogen, and * represents an optically active carbon.
  • Specific examples of formula 41 include 4'-n- (octyloxyphenyl4 '-(1,1,1-trifluoro-2-octyloxycarbonyl) biphenyl-4-carboxylate (4) '-n- (octyleoxyphenyl 4'-(1,1,1-trigluoro-2-octyloxycarbonyl) biphenyl-4-carboxylate).
  • the central core polyring chiral ferroelectric liquid crystal may be represented by Chemical Formulas 42 to 44.
  • Formula 42 is formulated as S-4- (trans-4-heptylcyclohexyl) -3'-chloro-4 "-(1-methylheptyloxy) terphenyl (S-4- (trans-4-heptylcyclohexyl) -3'- chloro-4 "-(1-methylheptyloxy) terphenyl).
  • Formula 43 represents R-4-octyl-3 "-chloro-4 '' '-(1-methylhexyloxy) quaterphenyl (R-4-octhyl-3" -chloro-4' ''-(1-methylhexyloxy ) quarterphenyl).
  • Formula 44 is formulated as S-4-nonyl-3'-fluoro-4 '' '-(2-chloropropyloxy) quaterphenyl (S-4-nonyl-3'-fluoro-4' ''-(2-chloropropyloxy ) quarterphenyl).
  • Formula 45 is butyl S-2- (4-octyl-2'-fluoro-3 "-trifluoromethyl-4 '' '-quaterphenyloxy) -propionate (S-2- (4-octyl- 2'-fluoro-3 "-trifluoromethyl-4 '' '-quarterphenyloxy) -propionate).
  • the ferroelectric smetic liquid crystal may be represented by at least one of Chemical Formulas 46 and 47.
  • R 20 and R 21 each represent a linear alkyl group having 1 to 9 carbon atoms
  • R 22 and R 23 each represent the same or different linear alkyl group having 1 to 18 carbon atoms
  • hydrogen may be substituted by CN, CF 3 , or halogen atom
  • —CH 2 — group is —CH ⁇ CH—, —O—, —CO—, —COO— , -OOC-, -O-OC-O- or -S-
  • X represents hydrogen or halogen.
  • the chiral smear ferroelectric liquid crystal may be represented by Chemical Formula 48.
  • R 24 is chiral or achiral alkyl or alkenyl having 1 to 20 carbon atoms
  • R 25 is chiral or achiral having 1 to 20 carbon atoms alkoxy
  • Alkenyloxy, alkylcarbonyloxy (alkyl-COO-) or alkenylcarbonyloxy (alkenyl-COO-) (in R 24 and R 25 , hydrogen is CN, CF 3 , or a halogen atom
  • L 10 to L 14 is hydrogen, halogen, cyano
  • the banana-type ferroelectric liquid crystal may be represented by the following Chemical Formula 49.
  • a 1 is or And B1 is or R 26 and R 27 are each independently hydrogen or halogen, and R 28 and R 29 are independently alkyl or alkoxy having 8 to 16 carbon atoms. Specific examples of Formula 49 are shown below.
  • the ferroelectric liquid crystal may be a single material of the ferroelectric liquid crystal or a mixture including the ferroelectric liquid crystal.
  • X 10 is hydrogen (H)
  • R 30 is hydrogen or alkyl of 1 to 15 carbon atoms
  • At least one hydrogen of the alkyl, alkenyl group may be replaced by fluorin or CH 3
  • R 32 , R 33 , R 34 , and R 35 are each CH 3 .
  • the induced dipole is parallel to the electric field, and the nematic liquid crystal having negative dielectric anisotropy is arranged in a direction perpendicular to the electric field.
  • the ferroelectric liquid crystal of the liquid crystal composition has a large arrangement characteristic according to the intermolecular and electric fields, the alignment of the liquid crystal composition can be uniformly stabilized.
  • the liquid crystal composition may further include a reactive mesogen material.
  • the liquid crystal composition comprises about 0.01% to about 3% by weight reactive mesogen material, about 70% to about 99.9% by weight of negative dielectric anisotropy, and the liquid crystal composition is about 0.1% by weight A mixture of nematic liquid crystals and ferroelectric liquid crystals having a positive dielectric anisotropy of% to about 30% by weight, and nematic liquid crystals having extra negative dielectric anisotropy.
  • the reactive mesogenic material means a polymerizable mesogenic compound.
  • a "mesogenic compound” or “mesogenic material” can include a substance or compound comprising one or more rod-shaped, plate- or disc-shaped mesogenic groups, ie groups having the ability to induce liquid crystalline phase behavior.
  • the reactive mesogen material may be a material which is polymerized by light such as ultraviolet rays and is oriented according to the alignment state of adjacent materials.
  • Examples of the reactive mesogen material include compounds represented by the following formula:
  • P1 and P2 are at least one of acrylate, methacrylate, vinyl, vinyloxy and epoxy groups, and A1 and A2 are 1,4-phenylene (phenylen) and naphthalene (naphthalene) -2,6-diyl group is at least one, Z1 is one of COO-, OCO- and a single bond, n may be one of 0, 1 and 2.
  • P1 and P2 may include at least one of acrylate, methacrylate, vinyl, vinyloxy, and epoxy groups.
  • the liquid crystal composition may include a ferroelectric liquid crystal, thereby making the alignment of the liquid crystal composition uniform with the nematic liquid crystal and improving stability of the alignment.
  • the liquid crystal composition includes a reactive mesogen material, the alignment speed of the liquid crystal composition may be increased, and the angle of the alignment may be increased, thereby improving optical characteristics.
  • the liquid crystal composition according to the embodiments of the present invention may include a non-ferroelectric liquid crystal and a ferroelectric liquid crystal.
  • the non-ferroelectric liquid crystal may include a nematic liquid crystal having negative anisotropy.
  • the ferroelectric liquid crystal may account for about 0.1% to about 30% by weight of the total amount of the liquid crystal composition.
  • the ferroelectric liquid crystal is about 0.1 wt% or less of the total amount of the liquid crystal composition, liquid crystal alignment of the liquid crystal composition may be unstable.
  • the ferroelectric liquid crystal exceeds about 30% by weight of the total amount of the liquid crystal composition, the viscosity of the liquid crystal composition may increase, thereby slowing the response speed of the display device including the liquid crystal composition.
  • the ferroelectric liquid crystal may be about 10% by weight of the total amount of the liquid crystal composition.
  • the liquid crystal composition may further comprise a reactive mesogen material.
  • the liquid crystal composition comprises about 0.1 wt% to about 30 wt% ferroelectric liquid crystal, about 0.01 wt% to about 3 wt% reactive mesogen material, and nematic liquid crystal having extra negative dielectric anisotropy. It may include.
  • the components, structures, and examples of the negatively anisotropic nematic liquid crystal, the ferroelectric liquid crystal, and the reactive mesogen material described in this embodiment are substantially the same as those described above, and a detailed description thereof will be omitted.
  • the non-ferroelectric liquid crystal may include a nematic liquid crystal having positive anisotropy and a nematic liquid crystal having negative anisotropy.
  • the liquid crystal composition may include a nematic liquid crystal having negative dielectric anisotropy of about 70% by weight to about 99.9% by weight.
  • the liquid crystal composition may further include a mixture of nematic liquid crystal and ferroelectric liquid crystal having dielectric anisotropy in an amount of about 0.1% to about 30% by weight.
  • the mixture of the positively anisotropic nematic liquid crystal and the ferroelectric liquid crystal includes a nematic liquid crystal having an amount of dielectric anisotropy of about 1% by weight to 90% by weight, and about 10% by weight to about 99% by weight of the ferroelectric liquid crystal. can do.
  • the liquid crystal composition may further comprise a reactive mesogen material.
  • the liquid crystal composition comprises a mixture of nematic liquid crystal and ferroelectric liquid crystal having dielectric anisotropy in an amount of about 0.1% by weight to about 30% by weight, about 0.01% by weight to 3% by weight of reactive mesogen material, Nematic liquid crystals with extra negative anisotropy.
  • the components, structures, and examples of the negatively anisotropic nematic liquid crystal, the positively anisotropic nematic liquid crystal, the ferroelectric liquid crystal, and the reactive mesogen material described in the present embodiment are substantially the same as those described above. The description will be omitted.
  • the liquid crystal composition may include a ferroelectric liquid crystal, thereby making the alignment of the liquid crystal composition uniform with the non-ferroelectric liquid crystal and improving the stability of the alignment.
  • the liquid crystal composition includes a reactive mesogen material, the alignment speed of the liquid crystal composition may be increased, and the angle of the alignment may be increased, thereby improving optical characteristics.
  • the liquid crystal composition may be prepared by mixing a nematic liquid crystal having negative anisotropy, a nematic liquid crystal having positive dielectric anisotropy, and a ferroelectric liquid crystal.
  • the liquid crystal composition is a mixture of a nematic liquid crystal having a negative dielectric anisotropy of about 70% by weight to about 99.9% by weight, and a nematic liquid crystal and a ferroelectric liquid crystal having a positive dielectric anisotropy of about 0.1% by weight to about 30% by weight. It can be prepared by mixing.
  • the mixture of the nematic liquid crystal having a positive anisotropy and the ferroelectric liquid crystal is a nematic liquid crystal having a dielectric anisotropy in an amount of about 1% by weight to 90% by weight, and about 10% by weight to about 99% by weight of the ferroelectric It can be prepared by mixing the liquid crystal.
  • the liquid crystal composition may further comprise a reactive mesogen material.
  • the liquid crystal composition comprises a mixture of about 0.01% to 3% by weight reactive mesogen material, a mixture of nematic liquid crystals and ferroelectric liquid crystals having dielectric anisotropy in an amount of about 0.1% to about 30% by weight, It can be prepared by mixing a nematic liquid crystal having a negative dielectric anisotropy of.
  • the liquid crystal composition may be prepared by mixing a nematic liquid crystal having a negative anisotropy and a ferroelectric liquid crystal. More specifically, it may be prepared by mixing a nematic liquid crystal having a negative dielectric anisotropy of about 70% by weight to about 99.9% by weight with a ferroelectric liquid crystal of about 0.1% by weight to about 30% by weight.
  • the liquid crystal composition may further comprise a reactive mesogen material.
  • the liquid crystal composition comprises about 0.01 wt% to about 3 wt% reactive mesogen material, the 0.1 wt% to about 30 wt% ferroelectric liquid crystal, and a nematic liquid crystal having extra negative dielectric anisotropy. It can be prepared by mixing.
  • the process temperature may be a temperature at which the largest amount of the material in the liquid crystal composition exhibits isotropic properties.
  • the mixing process temperature may be performed in a temperature range of about 90 ° to about 100 °.
  • the temperature range may be a temperature range when the nematic liquid crystal having negative dielectric anisotropy exhibits isotropic characteristics.
  • the mixing of the liquid crystal composition is performed within a temperature range of about 90 ° to about 100 °, but the present invention does not limit the mixing temperature of the liquid crystal composition.
  • FIG. 1 is a graph showing the electrical properties of the liquid crystal composition according to an embodiment of the present invention.
  • the x-axis of FIG. 1 represents time, the unit is seconds, the y-axis represents the applied voltage, and the unit is volts [V].
  • the nematic liquid crystal and the ferroelectric liquid crystal are not in the form of a compound but in the form of a mixture, so that the nematic liquid crystal exhibits its own characteristics and the ferroelectric liquid crystal can express its own characteristics.
  • the nematic liquid crystal and the ferroelectric liquid crystal may enhance and / or interfere with each other.
  • FIG. 2 is a cross-sectional view for describing a liquid crystal display according to an exemplary embodiment of the present invention.
  • the liquid crystal display includes a first display panel 100, a second display panel 200 spaced apart from and facing the first display panel 100, and the first and second display panels 100. It may include a liquid crystal layer 300 disposed between the 200.
  • the first display panel 100 includes a first substrate 110, a first electrode 120, and a first alignment layer 170, and the first substrate 110, the first electrode 120, and the first alignment layer. 170 may be sequentially stacked.
  • the first electrode 120 may include a transparent conductive material, for example, indium tin oxide (ITO), or indium zinc oxide (IZO). According to an embodiment, the first electrode 120 may include a first slit formed by patterning a part of the first electrode 120.
  • ITO indium tin oxide
  • IZO indium zinc oxide
  • the first alignment layer 170 may include an alignment base material and a reactive mesogen material.
  • the alignment base material of the first alignment layer may include at least one selected from the group consisting of polyimide, polyvinyl alcohol (PVA), polystyrene, and nylon.
  • examples of the reactive mesogen material are substantially the same as those described above, and a detailed description thereof will be omitted.
  • the first alignment layer 170 may be omitted.
  • the second display panel 200 includes a second substrate 210, a second electrode 220, and a second alignment layer 270, and the second substrate 210, the second electrode 220, and the second alignment layer. 270 may be stacked sequentially.
  • the first and second display panels 100 and 200 may be spaced apart from each other so that the first and second alignment layers 170 and 270 face each other.
  • the second electrode 220 may include a material that is the same as or similar to that of the first electrode 220, and a voltage different from that of the first electrode 120 may be applied. According to an embodiment, the second electrode 220 may include a second slit formed by patterning a part of the second electrode 220.
  • the second alignment layer 270 may include an alignment base material and a reactive mesogen material.
  • the alignment base material of the second alignment layer 270 may be similar to or substantially the same as the alignment base material of the first alignment layer. Examples of the reactive mesogen material are substantially the same as those described above, and a detailed description thereof will be omitted. In another embodiment, the second alignment layer 270 may be omitted.
  • the liquid crystal layer 300 may be disposed between the first and second display panels 100 and 200.
  • the liquid crystal layer 300 includes the liquid crystal composition described above, and a detailed description thereof will be referred to the above.
  • the first and second electrodes 120 and 220 are described as being disposed on the first and second display panels 100 and 200, respectively.
  • the 120 and 220 may be disposed on any one of the first or second display panels 100 and 200.
  • the first and second electrodes 120 and 220 may be disposed on the same layer, or the first and second electrodes 120 and 220 may be disposed on another layer with an insulating layer interposed therebetween.
  • the first and second slits may be formed in one of the first or second electrodes 120 and 220.
  • FIG. 3 is a plan view illustrating slit shapes of electrodes according to embodiments of the present invention.
  • At least one of the first and second electrodes 120 and 220 may have a Chevron pattern.
  • the seventh pattern may have a V shape including a first straight line extending in a first direction and a second straight line extending in another direction crossing the one direction.
  • the first and second slits having the seven pattern are exemplarily described, but the structure of the first and second slits is not limited in the present invention.
  • a first display panel comprising a first electrode having a first substrate and a first electrode having a first slit of a Sevron pattern, a second display panel comprising a second electrode having a second substrate and a second slit of a Sevron pattern, and the second display panel;
  • a liquid crystal display device including a liquid crystal layer filling the first and second display panels is manufactured.
  • the liquid crystal display is manufactured in a patterned vertical alignment (PVA) mode.
  • PVA patterned vertical alignment
  • the thickness of the liquid crystal layer of the said liquid crystal display device was produced at 3.8 micrometers.
  • the liquid crystal display devices of Examples 2 to 4 were manufactured in the same manner as in Example 1 except for the thickness of the liquid crystal layer.
  • the thicknesses of the liquid crystal layers of Examples 2 to 4 refer to Table 1 below.
  • a first display panel comprising a first electrode having a first substrate and a first electrode having a first slit of a Sevron pattern, a second display panel comprising a second electrode having a second substrate and a second slit of a Sevron pattern, and the second display panel;
  • a liquid crystal display device including a liquid crystal layer filling the first and second display panels is manufactured.
  • the liquid crystal display device was manufactured in PVA mode.
  • the thickness of the liquid crystal layer of the said liquid crystal display device was produced in 4.3 micrometers.
  • the liquid crystal display devices of Examples 6 to 8 were manufactured in the same manner except for the mixing ratio between Example 5, MLC 6608 and KFLC 3 in the liquid crystal layer. See Table 1 below for a mixing ratio between MLC 6608 and KFLC 3 in the liquid crystal layer.
  • a first display panel comprising a first electrode having a first substrate and a first electrode having a first slit of a Sevron pattern, a second display panel comprising a second electrode having a second substrate and a second slit of a Sevron pattern, and the second display panel;
  • a liquid crystal display device including a liquid crystal layer filling the first and second display panels is manufactured.
  • the liquid crystal display device was manufactured in PVA mode.
  • the thickness of the liquid crystal layer of the said liquid crystal display device was produced in 4.3 micrometers.
  • a first display panel comprising a first electrode having a first substrate and a first electrode having a first slit of a Sevron pattern, a second display panel comprising a second electrode having a second substrate and a second slit of a Sevron pattern, and the second display panel;
  • a liquid crystal display device including a liquid crystal layer filling the first and second display panels is manufactured.
  • the liquid crystal display device was manufactured in PVA mode.
  • the liquid crystal display devices of Comparative Examples 2 and 3 were manufactured in the same manner as in Comparative Example 1 except for the thickness of the liquid crystal layer.
  • the thicknesses of the liquid crystal layers of Comparative Examples 2 and 3 refer to Table 1 below.
  • Example 1 Liquid crystal layer Liquid crystal layer thickness [ ⁇ m] MLC 6608 [wt%] (negative nematic liquid crystal) KFLC 3 [wt%] (ferroelectric liquid crystal) ZKC-5085 [wt%] (positive nematic liquid crystal)
  • Example 1 90 10 0 3.8
  • Example 2 90 10 0 4.0
  • Example 3 90 10 0 4.3
  • Example 4 90 10 0 4.5 Comparative Example 1 100 0 0 4.3 Comparative Example 2 100 0 0 4.5 Comparative Example 3 100 0 0 4.8
  • Example 5 99 One 0 4.3 Example 6 95 5 0 4.3 Example 7 80 20 0 4.3 Example 8 70 30 0 4.3
  • Example 9 90 5 5 5 4.3
  • 4A to 4E are graphs comparing the transmittances of the liquid crystal display devices of Examples 1 to 4 and the liquid crystal display devices of Comparative Examples 1 to 3.
  • 4A to 4C are graphs showing transmittance according to applied voltage.
  • the x-axis is an applied voltage and a unit is [V]
  • the y-axis represents transmittance.
  • FIG. 4A the liquid crystal display of Examples 1 to 4 exhibits excellent overall transmittance as compared to Comparative Examples 1 to 3.
  • FIG. 4B optionally shows the transmittance of Example 4 and Comparative Example 2 in FIG. 4A. 4B, it was observed that the transmittance of Example 4 was superior to that of Comparative Example 2 at the same liquid crystal layer thickness of 4.5 ⁇ m.
  • 4C optionally shows the transmittance of Example 4 and Comparative Example 3 in FIG. 4A. Referring to FIG. 4C, when comparing Example 4 having the highest transmittance among Examples 1 to 4 and Comparative Example 3 having the highest transmittance among Comparative Examples 1 to 3, it was observed that the transmittance of Example 4 was excellent.
  • FIG. 4D and 4E are graphs illustrating transmittance according to the thickness of a liquid crystal layer after applying a voltage of 7 V to the liquid crystal display devices of Examples 1 to 4 and the liquid crystal display devices of Comparative Examples 1 to 3. More specifically, FIG. 4D is a graph showing the transmittance according to the thickness of the liquid crystal layer, and FIG. 4E is a transmittance according to the product ( ⁇ n ⁇ d) of the thickness (d) of the liquid crystal layer and the refractive index ( ⁇ n) of the liquid crystal layer. It is a graph showing.
  • the x-axis of Figures 4d and 4e is the length unit is [ ⁇ m], the y-axis represents the transmittance.
  • the transmittance of the liquid crystal display devices of Examples 1 to 4 is about 17% to about 30% superior to that of the liquid crystal display devices of Comparative Examples 1 to 3.
  • the transmittance of the liquid crystal displays of Examples 1 to 4 is about 9% to about 17% superior to the transmittance of the liquid crystal displays of Comparative Examples 1 to 3. It can be seen that.
  • the transmittances of the liquid crystal display devices of Examples 1 to 4 are compared to those of Comparative Examples 1 to 3 The transmittance of the liquid crystal display device is better.
  • 5A to 5D are graphs comparing the response speeds of the liquid crystal display devices of Examples 1 to 4 and the liquid crystal display devices of Comparative Examples 1 to 3.
  • 5A and 5B are graphs illustrating a response speed according to an applied voltage.
  • the x-axis is an applied voltage and a unit is [V]
  • the y-axis represents a response speed.
  • the response speeds of the liquid crystal display devices of Examples 1 to 4 are not much slower than those of the liquid crystal display devices of Comparative Examples 1 to 3. Since the liquid crystal layers of Examples 1 to 4 contain ferroelectric liquid crystals, the viscosity of the liquid crystal layers is increased, which is slightly slower than the response speeds of the liquid crystal display devices of Comparative Examples 1 to 3, but seems to be similar.
  • Example 5B is selectively shown to confirm the response speed according to the voltage of Example 3 showing the maximum transmittance in Examples 1 to 4 and Comparative Example 3 showing the maximum transmittance in Comparative Examples 1 to 3.
  • FIG. 5B when comparing the response speeds of Example 3 and Comparative Example 3 having excellent transmittance, it can be seen that the response speed of Example 3 is faster than that of Comparative Example 3.
  • FIG. 5B when comparing the response speeds of Example 3 and Comparative Example 3 having excellent transmittance, it can be seen that the response speed of Example 3 is faster than that of Comparative Example 3.
  • FIG. 5C and 5D are graphs illustrating a response speed according to a thickness of a liquid crystal layer after applying a voltage of 7 V to the liquid crystal display devices of Examples 1 to 4 and the liquid crystal display devices of Comparative Examples 1 to 3. More specifically, FIG. 5C is a graph showing a response speed according to the thickness of the liquid crystal layer, and FIG. 5D is a response according to the product ( ⁇ n ⁇ d) of the thickness d of the liquid crystal layer and the refractive index ⁇ n of the liquid crystal layer. Graph showing speed. The x-axis in Figs. 5c and 5d is the length in [m] and the y-axis is the response speed in [ms].
  • the response speed of Example 1 having a liquid crystal layer thickness of about 3.8 ⁇ m is about 18 ms. Can be.
  • the response speeds of the liquid crystal display devices of Examples 1 to 4 are about 22% to about 24 times the response speeds of the liquid crystal display devices of Comparative Examples 1 to 3. You can see it's about% faster.
  • the liquid crystal display device of Examples 1 to 4 includes a ferroelectric liquid crystal having a relatively high viscosity, a liquid crystal having an appropriate thickness and refractive index By including the layer, a response speed faster than that of Comparative Examples 1 to 3 can be achieved. Therefore, the liquid crystal display of Embodiments 1 to 4 may not only have a fast response speed but also have stable and uniform alignment of liquid crystal molecules with ferroelectric liquid crystals.
  • FIG. 6A is a graph illustrating transmittances of the liquid crystal displays of Examples 5 to 8
  • FIG. 6B is a graph illustrating response speeds of the liquid crystal displays of Examples 5 to 8.
  • the transmittance is improved.
  • the response speed is about 2 times slower. Therefore, in the present embodiments, it is preferable that the ferroelectric liquid crystal in the liquid crystal composition does not exceed 30% by weight of the total amount of the composition.
  • 7A to 7C and 8A to 8C are liquid crystals of Comparative Example 1, Example 3, and Example 9;
  • the textures of the display devices are the textures of the display devices.
  • Comparative Examples 1, 3, and 9 are substantially the same liquid crystal display devices except for the composition ratio of the liquid crystal layer.
  • Table 2 shows their composition ratios again.
  • the textures of FIGS. 7A-7C are white images under a cross polarizer.
  • the white images show a case where the angle between the cross polarizer and the liquid crystal molecules of the liquid crystal layer is 45 °, and the light is passed through the liquid crystal layer and is illuminated. This can be confirmed by Equation 1 below.
  • Equation 1 T is the transmittance, ⁇ is the angle between the polarizing plate and the liquid crystal molecules, ⁇ n is the birefringence value, d is the thickness of the liquid crystal layer, ⁇ is the wavelength of the irradiated light.
  • ⁇ is 45 °, the value of sin 2 has the highest value and the highest transmittance.
  • FIG. 7A to 7C are textures of Comparative Example 1, Example 3, and Example 9, respectively.
  • FIG. 7A a defect that looks black at the edge portions of the slit or the boundary of the slit is shown.
  • FIG. 7B it can be seen that the defect disappeared much compared to FIG. 7A at the edge of the slit.
  • FIG. 7C it can be seen that defects at the boundary of the slit as well as the edge portions of the slit are removed.
  • the textures of FIGS. 8A-8C are black images under a cross polarizer.
  • the black images are a case where the angle between the cross-polarizing plate and the liquid crystal molecules of the liquid crystal layer is 0 °. Show them.
  • the value of sin 2 has a value of 0, so that the transmittance is zero.
  • FIGS. 8A through 8C are textures of Comparative Example 1, Example 3, and Example 9, respectively.
  • FIG. 8A light leakage is seen at edges of the slit or at the boundary of the slit.
  • FIGS. 8B and 8C it can be seen that much light leakage is removed from the edge portion and the boundary of the slit compared to FIG. 8A.
  • the alignment of the liquid crystal molecules in the liquid crystal layer is uniform and stable compared to the liquid crystal layer containing no ferroelectric material, thereby improving the brightness of the liquid crystal display device.
  • 9A and 9B are graphs showing gray levels of the textures of Comparative Examples 1, 3, and 9; 9A and 9B are evaluated at 256 (2 8 ) gray levels, showing gray near black as going to zero, and showing the darkness of gray from 0 to 256 levels.
  • FIG. 9A shows the gray level of the texture of FIGS. 7A-7C, which are often seen near 256 of the gray level as white images.
  • Comparative Example 1 of FIG. 7A is often seen between gray levels of about 200 to 230, and it can be seen that the width of the peak is wide.
  • Example 3 of FIG. 7B shows a lot between gray levels of about 240 to 250, and it can be seen that the peak width is narrower than that of Comparative Example 1.
  • FIG. Example 9 of FIG. 7C shows much between gray levels of about 230 to 250, and it can be seen that the peak width is narrower than that of Comparative Example 1.
  • FIG. 9B shows the gray level of the texture of FIGS. 8A-8C, which are seen much near zero of the gray level as black images.
  • Comparative Example 1 of FIG. 8A a lot is seen between gray levels of about 30 to 50, and it can be seen that the width of the peak is wide.
  • Example 3 of FIG. 8B shows a lot between gray levels about 0-20, and it can be seen that the width of the peak is narrower than the peak width of 1 in comparison.
  • Example 9 of FIG. 8C shows much between gray levels about 0 to 30, and it can be seen that the width of the peak is narrower than the peak width of Comparative Example 1.
  • the alignment of the liquid crystal molecules in the liquid crystal layer is more uniform and stable than that of the liquid crystal layer not containing the ferroelectric material.
  • the brightness can be improved.

Abstract

La présente invention concerne une composition de cristaux liquides. La composition de cristaux liquides comprend : un cristal liquide nématique négatif ; un cristal liquide nématique positif ; et un cristal liquide ferroélectrique.
PCT/KR2013/005573 2012-06-25 2013-06-25 Composition de cristaux liquides WO2014003399A1 (fr)

Priority Applications (2)

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CN201380044492.8A CN104685026B (zh) 2012-06-25 2013-06-25 液晶组合物
US14/411,367 US20150191650A1 (en) 2012-06-25 2013-06-25 Liquid crystal composition

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KR10-2012-0067984 2012-06-25
KR20120067984 2012-06-25
KR1020120118692A KR20140001071A (ko) 2012-06-25 2012-10-24 액정 조성물
KR10-2012-0118692 2012-10-24

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4871472A (en) * 1986-02-13 1989-10-03 Merck Patent Gesellschaft Mit Beschrankter Haftung Esters in ferroelectric mixtures
US5332521A (en) * 1988-07-26 1994-07-26 Idemitsu Kosan Co., Ltd. Ferroelectric liquid crystal composition, liquid crystal optical device produced by using the ferroelectric liquid crystal composition, and method of producing the liquid crystal optical device
JPH0933957A (ja) * 1995-07-20 1997-02-07 Samsung Electron Devices Co Ltd 液晶表示装置
KR19980702063A (ko) * 1995-02-10 1998-07-15 스켈톤 에스 알 액정 장치
JP2008518899A (ja) * 2004-11-03 2008-06-05 キネティック リミテッド 液晶装置に使用される化合物

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4871472A (en) * 1986-02-13 1989-10-03 Merck Patent Gesellschaft Mit Beschrankter Haftung Esters in ferroelectric mixtures
US5332521A (en) * 1988-07-26 1994-07-26 Idemitsu Kosan Co., Ltd. Ferroelectric liquid crystal composition, liquid crystal optical device produced by using the ferroelectric liquid crystal composition, and method of producing the liquid crystal optical device
KR19980702063A (ko) * 1995-02-10 1998-07-15 스켈톤 에스 알 액정 장치
JPH0933957A (ja) * 1995-07-20 1997-02-07 Samsung Electron Devices Co Ltd 液晶表示装置
JP2008518899A (ja) * 2004-11-03 2008-06-05 キネティック リミテッド 液晶装置に使用される化合物

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