WO2017026478A1 - Élément d'affichage à cristaux liquides - Google Patents

Élément d'affichage à cristaux liquides Download PDF

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WO2017026478A1
WO2017026478A1 PCT/JP2016/073422 JP2016073422W WO2017026478A1 WO 2017026478 A1 WO2017026478 A1 WO 2017026478A1 JP 2016073422 W JP2016073422 W JP 2016073422W WO 2017026478 A1 WO2017026478 A1 WO 2017026478A1
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liquid crystal
group
carbon atoms
general formula
coo
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PCT/JP2016/073422
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Japanese (ja)
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琴姫 張
史晃 小寺
藤沢　宣
須藤　豪
平田　真一
和樹 栗沢
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Dic株式会社
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/20—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54—Additives having no specific mesophase characterised by their chemical composition
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers

Definitions

  • the present invention relates to a liquid crystal display element.
  • the field sequential full-color display method that does not require a color filter is characterized by the use of a backlight that is lit in order of “red ⁇ green ⁇ blue”.
  • the frame time In a normal CRT or liquid crystal display, the frame time is 16.7 ms, but in the field sequential full color display system, the frame time is 5.6 ms, and high-speed response is required.
  • ⁇ d is the fall response time of the liquid crystal
  • ⁇ r is the rise response time of the liquid crystal.
  • the sum of ⁇ d and ⁇ r is less than 1.5 ms.
  • nematic liquid crystal in the market is generally used in flat panel displays such as televisions, monitors, mobile phones, smartphones, and tablet terminals.
  • nematic liquid crystals have a response speed as low as about several tens of milliseconds to several milliseconds, and hence improvement is desired. Since the response speed is greatly influenced by the rotational viscosity ⁇ 1 of the liquid crystal and the elastic constant, improvement has been studied by developing new compounds and optimizing the composition, but the progress of the improvement is slow.
  • a ferroelectric liquid crystal (FLC) using a smectic liquid crystal can respond at a high speed of several hundred microseconds.
  • the Polymer Stabilized V shaped-FLC (PSV-FLC) element which is a mixture of FLC and monomer, forms a fine polymer network in a ferroelectric liquid crystal, and is a high-speed response characteristic of FLC.
  • PSV-FLC Polymer Stabilized V shaped-FLC
  • nematic liquid crystal and polymer in a composite material of nematic liquid crystal and polymer, a high-speed response of several tens of microseconds is obtained when 70% by mass or more of a polymerizable compound is added to the nematic liquid crystal medium, but the driving voltage exceeds about 80V. Since it is not suitable for practical use and the effective birefringence is one digit or more lower than the liquid crystal birefringence used, the transmittance of the element is lowered. On the other hand, one or more polymerizable compounds of 0.3% by mass or more and less than 1% by mass are added to the liquid crystal medium and polymerized on the glass substrate interface by UV photopolymerization with or without application of voltage.
  • PS polymer-stable
  • PSA polymer-stained alignment
  • these devices also have room for improvement in terms of high-speed response.
  • the liquid crystal composition has a low viscosity, a high dielectric constant, a low elastic constant, a pretilt angle, or an improved drive method such as an overdrive method.
  • the falling rate no effective method has been found other than lowering the viscosity of the liquid crystal composition, and improvement has been desired.
  • JP 2002-31821 A Special table 2013-536271 gazette Special table 2013-538249 gazette Special table 2012-527495 gazette Special table 2012-513482 gazette JP 2012-219270 A
  • the problem to be solved by the present invention is to provide an excellent liquid crystal display element that has excellent high-speed response by improving the fall time of liquid crystal and suppresses the occurrence of display unevenness due to non-uniform initiator concentration. is there.
  • the present inventor includes a polymer or copolymer that is a cured product of a polymerizable composition containing a polymerizable compound and a liquid crystalline compound that generates radicals by light or heat in the liquid crystal composition,
  • the content of the polymerizable composition in the total weight of the liquid crystalline composition and the liquid crystal composition is found to be 1% by mass or more and less than 40% by mass, and the present invention is completed. It was.
  • rings A, B and C are 1,4-phenylene group, 1,4-cyclohexylene group, anthracene-2,6-diyl group, phenanthrene-2,7-diyl group, pyridine-2,5- diyl group, pyrimidine-2,5-diyl group, a naphthalene-2,6-diyl group, ring a, B, hydrogen atoms present in C is a halogen atom, may be substituted with an alkoxyl group .
  • X 1 To X 5 each independently represents a single bond, —O—, —CO—, —OCO— or —COO—, wherein Z 1 and Z 2 are —COO—, —OCO—, —CH 2 CH 2 —, —CH ⁇ CH—, —C ⁇ C—, —CF ⁇ CF—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —,
  • At least one of X 1 to X 5 and Z 1 to Z 2 is —COO— or —OCO—, and the oxygen atom not contained in the carbonyl group in —COO— or —OCO— is 1 , 4-phenylene group, anthracene-2,6-diyl group, phenanthrene-2,7-diyl group, pyridine-2,5-diyl group, pyrimidine-2,5-diyl group, naphthalene-2,6-diyl group R 1 to R 5 each independently represent hydrogen or an alkylene group having 1 to 12 carbon atoms, and one or more hydrogen atoms in hydrogen or the alkyl are —P
  • One or two or more methylene groups in the alkyl may be independently substituted with —CH ⁇ CH—, —CO—, —O—, so that oxygen atoms are not directly bonded to each other.
  • P- may be substituted, and P is polymerized (N1 to n3 represent 0, 1, 2, 3 or 4; n represents 0, 1, 2 or 3) [9]
  • the liquid crystal display device according to any one of the above.
  • the polymerizable compound one or more compounds selected from the compound represented by the following general formula (P) (excluding the compound represented by the general formula (1)) are contained.
  • the liquid crystal display element according to the above [6] or [7].
  • Z p1 is a fluorine atom, a cyano group, a hydrogen atom, an alkyl group having 1 to 15 carbon atoms in which a hydrogen atom may be substituted with a halogen atom, or a hydrogen atom in which a hydrogen atom is substituted with a halogen atom.
  • a suitable alkoxy group having 1 to 15 carbon atoms, an alkenyl group having 1 to 15 carbon atoms in which a hydrogen atom may be substituted with a halogen atom, or 1 to carbon atoms in which a hydrogen atom may be substituted with a halogen atom 15 alkenyloxy groups or -Sp p2 -R p2 R p1 and R p2 are each independently the following formulas (RI) to (R-IX):
  • R 2 to R 6 are independently of each other a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or the number of carbon atoms. 1 to 5 halogenated alkyl groups, W is a single bond, —O— or a methylene group, T is a single bond or —COO—, and p, t and q are each independently 0, Represents 1 or 2, Sp p1 and Sp p2 each represent a spacer group, and each of Sp p1 and Sp p2 independently represents a single bond, an alkylene group having 1 to 12 carbon atoms, or —O— (CH 2 ) s — (wherein s is Represents an integer of 1 to 11, and an oxygen atom is bonded to an aromatic ring).
  • M p2 represents 1,4-phenylene group, 1,4-cyclohexylene group, anthracene-2,6-diyl group, phenanthrene-2,7-diyl group, pyridine-2,5-diyl group, pyrimidine-2, 5-diyl group, naphthalene-2,6-diyl group, indan-2,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or 1,3-dioxane-2,5 -Represents a diyl group, but M p2 is unsubstituted or an alkyl group having 1 to 12 carbon atoms, a halogenated alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a carbon atom May be substituted with a halogenated alkoxy group of formula 1 to 12, a halogen atom, a cyano group
  • M p3 represents the following formulas (i-13) to (ix-13):
  • m p2 to m p4 each independently represents 0, 1, 2 or 3
  • m p1 and m p5 each independently represent 1, 2 or 3, but when there are a plurality of Z p1 May be the same or different.
  • R p1 When a plurality of R p1 are present, they may be the same or different.
  • R p2 When a plurality of R p2 are present, they may be the same.
  • R LC represents an alkyl group having 1 to 15 carbon atoms.
  • One or two or more CH 2 groups in the alkyl group are such that oxygen atoms are not directly adjacent to each other.
  • —O—, —CH ⁇ CH—, —CO—, —OCO—, —COO— or —C ⁇ C— may be substituted, and one or more hydrogen atoms in the alkyl group are optionally substituted
  • a LC1 and A LC2 each independently represents a group selected from the group consisting of the following groups (a), (b) and (c).
  • trans-1,4-cyclohexylene group one CH 2 group present in this group or two or more CH 2 groups not adjacent to each other may be substituted with an oxygen atom or a sulfur atom
  • B 1,4-phenylene group (one CH group present in this group or two or more non-adjacent CH groups may be substituted with a nitrogen atom)
  • C 1,4-bicyclo (2.2.2) octylene group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2 , 6-Diyl group or Chroman-2,6-diyl group.
  • One or two or more hydrogen atoms contained in the group (a), the group (b) or the group (c) may be substituted with a fluorine atom, a chlorine atom, —CF 3 or —OCF 3 , respectively.
  • Z LC is a single bond, —CH ⁇ CH—, —CF ⁇ CF—, —C ⁇ C—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O—, —COO— or —OCO— is represented.
  • Y LC represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, and an alkyl group having 1 to 15 carbon atoms.
  • One or more CH 2 groups in the alkyl group may be —O—, —CH ⁇ CH—, —CO—, —OCO—, —COO—, —C, so that the oxygen atom is not directly adjacent.
  • ⁇ C—, —CF 2 O—, —OCF 2 — may be substituted, and one or more hydrogen atoms in the alkyl group may be optionally substituted with a halogen atom.
  • a represents an integer of 1 to 4.
  • the plurality of ALC1s may be the same or different, and there are a plurality of ZLCs A plurality of Z LCs may be the same or different.
  • the liquid crystal display device according to any one of [1] to [11], wherein the cell structure is a VA mode, an IPS mode, an FFS mode, a VA-TN mode, a TN mode, or an ECB mode.
  • the present invention it is possible to provide an excellent liquid crystal display element that has excellent high-speed response by improving the fall time of the liquid crystal and suppresses display unevenness due to non-uniform initiator concentration.
  • the liquid crystal composition used in the present invention preferably contains a liquid crystal compound represented by the general formula (LC).
  • R LC represents an alkyl group having 1 to 15 carbon atoms.
  • One or more CH 2 groups in the alkyl group are —O—, —CH ⁇ CH—, —CO—, —OCO—, —COO— or —C, so that the oxygen atom is not directly adjacent.
  • ⁇ C— may be substituted, and one or more hydrogen atoms in the alkyl group may be optionally substituted with a halogen atom.
  • Alkyl group R LC may be respectively branched chain groups, may be straight chain groups, but is preferably a linear group.
  • a LC1 and A LC2 each independently represent a group selected from the group consisting of the following group (a), group (b) and group (c).
  • C 1,4-bicyclo (2.2.2) octylene group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2 , 6-Diyl group or Chroman-2,6-diyl group.
  • One or two or more hydrogen atoms contained in the group (a), the group (b) or the group (c) may be substituted with a fluorine atom, a chlorine atom, —CF 3 or —OCF 3 , respectively. Good.
  • Z LC is a single bond, —CH ⁇ CH—, —CF ⁇ CF—, —C ⁇ C—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —. , -CH 2 O -, - OCF 2 -, - CF 2 O -, - COO- or an -OCO-.
  • Y LC represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, or an alkyl group having 1 to 15 carbon atoms.
  • One or more CH 2 groups in the alkyl group may be —O—, —CH ⁇ CH—, —CO—, —OCO—, —COO—, —C, so that the oxygen atom is not directly adjacent.
  • ⁇ C—, —CF 2 O—, —OCF 2 — may be substituted, and one or more hydrogen atoms in the alkyl group may be optionally substituted with a halogen atom.
  • a represents an integer of 1 to 4.
  • a represents 2, 3 or 4
  • the plurality of ALC1s may be the same or different
  • there are a plurality of ZLCs A plurality of Z LCs may be the same or different.
  • the compound represented by the general formula (LC) is preferably one or more compounds selected from the group of compounds represented by the following general formula (LC1) and general formula (LC2).
  • R LC11 and R LC21 each independently represent an alkyl group having 1 to 15 carbon atoms, and one or more CH 2 groups in the alkyl group are One of the alkyl groups may be substituted with —O—, —CH ⁇ CH—, —CO—, —OCO—, —COO— or —C ⁇ C— so that the oxygen atom is not directly adjacent. Alternatively, two or more hydrogen atoms may be optionally substituted with a halogen atom.
  • R LC11 and R LC21 are each independently an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or the number of carbon atoms.
  • An alkenyl group having 2 to 7 carbon atoms is preferable, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, and an alkenyl group having 2 to 5 carbon atoms are more preferable, and it is further linear.
  • the alkenyl group preferably represents the following structure.
  • a LC11 and A LC21 each independently represent any one of the following structures.
  • one or more CH 2 groups in the cyclohexylene group may be substituted with an oxygen atom
  • one or more CH groups in the 1,4-phenylene group are nitrogen atoms.
  • one or more hydrogen atoms in the structure may be substituted with a fluorine atom, a chlorine atom, —CF 3, or —OCF 3 .
  • ALC11 and ALC21 each independently preferably have one of the following structures.
  • X LC11, X LC12, X LC21 ⁇ X LC23 are each independently a hydrogen atom, a chlorine atom, a fluorine atom, a -CF 3 or -OCF 3
  • Y LC11 and Y LC21 each independently represents a hydrogen atom, a chlorine atom, a fluorine atom, a cyano group, —CF 3 , —OCH 2 F, —OCHF 2 or —OCF 3 .
  • Y LC11 and Y LC21 are each independently preferably a fluorine atom, a cyano group, —CF 3 or —OCF 3 , and a fluorine atom or —OCF 3 is More preferred is a fluorine atom.
  • Z LC11 and Z LC21 are each independently a single bond, —CH ⁇ CH—, —CF ⁇ CF— , —C ⁇ C— , —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O—, —COO— or —OCO— is represented.
  • Z LC11 and Z LC21 are each independently a single bond, —CH 2 CH 2 —, —COO— , —OCO— , —OCH 2 —, —CH 2 O—, —OCF 2 — or —CF 2 O— is preferred, and a single bond, —CH 2 CH 2 —, —OCH 2 —, —OCF 2 — or —CF 2 O— is more preferred, and a single bond -OCH 2 -or -CF 2 O- is more preferable.
  • m LC11 and m LC21 each independently represents an integer of 1 to 4.
  • mLC11 and mLC21 are preferably independently 1, 2 or 3, respectively, and when importance is attached to storage stability at low temperature and response speed. 1 or 2 is more preferable, and 2 or 3 is more preferable when improving the upper limit of the nematic phase upper limit temperature.
  • a LC11 , A LC21 , Z LC11 and Z LC21 are present in the general formula (LC1) or (LC2), they may be the same or different.
  • the compound represented by the general formula (LC1) is one or more compounds selected from the group consisting of compounds represented by the following general formulas (LC1-a) to (LC1-c) Is preferred.
  • R LC11 each independently represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, An alkenyl group having 2 to 7 carbon atoms is preferable, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, and an alkenyl group having 2 to 5 carbon atoms are more preferable.
  • a hydrogen atom or a fluorine atom X LC11 and X LC12 each independently, Y LC11 each independently a fluorine atom, -CF 3 or -OCF 3 are preferred.
  • a LC1a1 , ALC1a2 and ALC1b1 are trans-1,4-cyclohexylene group, tetrahydropyran-2,5-diyl group, 1,3-dioxane. Represents a -2,5-diyl group.
  • X LC1b1 , X LC1b2 and X LC1c1 to X LC1c4 each independently represent a hydrogen atom, a chlorine atom, a fluorine atom, —CF 3 or —OCF 3 .
  • X LC1b1 , X LC1b2 and X LC1c1 to X LC1c4 are each independently preferably a hydrogen atom or a fluorine atom.
  • the general formula (LC1) is also preferably one or more compounds selected from the group consisting of compounds represented by the following general formula (LC1-d) to general formula (LC1-p).
  • R LC11 is in formula each independently (LC1), Y LC11, X LC11 and X LC12 Represents the same meaning.
  • R LC11 is independently an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or the number of carbon atoms.
  • alkenyl group having 2 to 7 carbon atoms is preferable, and an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, and an alkenyl group having 2 to 5 carbon atoms are more preferable.
  • X LC11 and X LC12 is preferably a hydrogen atom or a fluorine atom independently.
  • Y LC11 is preferably independently a fluorine atom, —CF 3 or —OCF 3 .
  • a LC1d1 , A LC1f1 , A LC1g1 , A LC1j1 , A LC1k1 , A LC1k2 , A LC1m1 to A LC1m3 are each independently a 1,4-phenylene group Represents a trans-1,4-cyclohexylene group, a tetrahydropyran-2,5-diyl group, or a 1,3-dioxane-2,5-diyl group.
  • X LC1d1 to X LC1m2 are preferably each independently a hydrogen atom or a fluorine atom.
  • Z LC1d1 , Z LC1e1 , Z LC1j1 , Z LC1k1 and Z LC1m1 are each independently a single bond, —CH ⁇ CH—, —CF ⁇ CF— , — C ⁇ C—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O—, —COO— or —OCO— To express.
  • Z LC1d1 to Z LC1m1 are each independently a single bond, —CH 2 CH 2 —, — (CH 2 ) 4 —, —CF 2 O— or —OCH 2 — is preferred.
  • R LC11 independently represents an alkyl group having 1 to 7 carbon atoms.
  • the general formula (LC2) is preferably one or more compounds selected from the group consisting of compounds represented by the following general formula (LC2-a) to general formula (LC2-g).
  • R LC21 is independently an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or the number of carbon atoms.
  • X LC21 to X LC23 are each independently preferably a hydrogen atom or a fluorine atom, and Y LC21 is preferably independently a fluorine atom, —CF 3 or —OCF 3 .
  • X LC2d1 to X LC2d4 , X LC2e1 to X LC2e4 , X LC2f1 to X LC2f4 and X LC2g1 to X LC2g4 are each independently hydrogen atom, chlorine atom, fluorine Represents an atom, —CF 3 or —OCF 3 ;
  • X LC2d1 to X LC2g4 are each independently preferably a hydrogen atom or a fluorine atom.
  • Z LC2a1 , Z LC2b1 , Z LC2c1 , Z LC2d1 , Z LC2e1 , Z LC2f1 and Z LC2g1 are each independently a single bond, —CH ⁇ CH—, — CF ⁇ CF—, —C ⁇ C—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O—, —COO -Or -OCO- is represented.
  • Z LC2a1 to Z LC2g4 are preferably each independently —CF 2 O— or —OCH 2 —.
  • the compound represented by the general formula (LC) is preferably one or more compounds selected from the group of compounds represented by the following general formula (LC3) to general formula (LC5).
  • R LC31, R LC32, R LC41 , R LC42, R LC51 and R LC52 is 1 to 15 carbon atoms independently, one in the alkyl group or two or more —CH 2 — may be substituted with —O—, —CH ⁇ CH—, —CO—, —OCO—, —COO— or —C ⁇ C— so that the oxygen atom is not directly adjacent.
  • one or more hydrogen atoms in the group may be optionally substituted by a halogen atom, a LC31, a LC32, a LC41, a LC42, a LC51 and a LC52 each independently any of the following Structure
  • one or more —CH 2 — in the cyclohexylene group may be substituted with an oxygen atom
  • one or more —CH— in the 1,4-phenylene group is Any one of which may be substituted with a nitrogen atom
  • one or more hydrogen atoms in the structure may be substituted with a fluorine atom, a chlorine atom, —CF 3 or —OCF 3 ).
  • Z LC31, Z LC32, Z LC41, Z LC42, Z LC51 and Z LC51 each independently represent a single bond
  • -CH CH -, - C ⁇ C -, - CH 2 CH 2 -, - ( CH 2 ) 4 —, —COO—, —OCH 2 —, —CH 2 O—, —OCF 2 — or —CF 2 O—
  • Z 5 represents —CH 2 — or an oxygen atom
  • X LC41 represents Represents a hydrogen atom or a fluorine atom
  • m LC31 , m L C32, m LC41, m LC42, m LC51 and m LC52 each independently represent 0 ⁇ 3, m LC31 + m LC32, m LC41 + m LC42 and m LC51 + m LC52 is 1, 2 or 3,
  • a LC31 ⁇ When a plurality of A LC52 and Z
  • R LC31 to R LC52 are each independently preferably an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms. Most preferably,
  • a LC31 to A LC52 each independently preferably has the following structure:
  • Z LC31 to Z LC51 each independently has a single bond, —CH 2 O—, —COO—, —OCO— , —CH 2 CH 2 —, —CF 2 O—, —OCF 2 — or —OCH 2 —. preferable.
  • Compounds represented by general formula (LC3), general formula (LC4), and general formula (LC5) include general formula (LC3-1), general formula (LC4-1), and general formula (LC5-1).
  • R 31 to R 33 are alkyl groups having 1 to 8 carbon atoms, alkenyl groups having 2 to 8 carbon atoms, alkoxy groups having 1 to 8 carbon atoms, or alkenyloxy groups having 2 to 8 carbon atoms.
  • R 41 to R 43 represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms.
  • Z 31 to Z 33 are a single bond, —CH ⁇ CH—, —C ⁇ C—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —COO—, —OCO—, —OCH 2 —. , —CH 2 O—, —OCF 2 — or —CF 2 O—,
  • X 41 represents a hydrogen atom or a fluorine atom
  • Z 34 represents —CH 2 — or an oxygen atom. It is preferable to contain at least one compound selected from the group .
  • R 31 to R 33 are alkyl groups having 1 to 8 carbon atoms, alkenyl groups having 2 to 8 carbon atoms, and 1 to 8 carbon atoms. Represents an alkoxy group or an alkenyloxy group having 2 to 8 carbon atoms, preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and an alkyl group having 2 to 5 carbon atoms.
  • R 41 to R 43 represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms, It preferably represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms.
  • it represents an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms, more preferably represents an alkyl group having 3 carbon atoms or an alkoxy group having 2 carbon atoms, and has 2 carbon atoms. It is particularly preferred to represent an alkoxy group.
  • Z 31 to Z 33 are a single bond, —CH ⁇ CH—, —C ⁇ C—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —COO—, —OCO—, —OCH 2 —, — CH 2 O—, —OCF 2 — or —CF 2 O— represents a single bond, —CH 2 CH 2 —, —COO—, —OCH 2 —, —CH 2 O—, —OCF 2 — or — It preferably represents CF 2 O—, and more preferably represents a single bond or —CH 2 O—.
  • the liquid crystal composition contains 5% by mass to 50% by mass of a compound selected from the group of compounds represented by general formula (LC3-1), general formula (LC4-1), and general formula (LC5-1). It is preferably 5 to 40% by mass, more preferably 5 to 30% by mass, more preferably 8 to 27% by mass, and more preferably 10 to 25% by mass. % Content is more preferable.
  • the compound represented by the general formula (LC3-1) is preferably a compound represented by the following general formula (LC3-11) to general formula (LC3-15).
  • the compound represented by the general formula (LC4-1) is preferably a compound represented by the following general formula (LC4-11) to general formula (LC4-14).
  • the compound represented by the general formula (LC5-1) is preferably a compound represented by the following general formula (LC5-11) to general formula (LC5-14).
  • R 33 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms
  • R 43a represents an alkyl group having 1 to 5 carbon atoms
  • Z 34 represents —CH 2 -Or represents an oxygen atom.
  • R 31 to R 33 are preferably the same embodiments as in formulas (LC3-1) to (LC5-1).
  • R 41a to R 41c are preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 or 2 carbon atoms, and particularly preferably an alkyl group having 2 carbon atoms.
  • R 31 to R 33 are preferably the same embodiments as in formulas (LC3-1) to (LC5-1).
  • R 41a to R 41c are preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 or 3 carbon atoms, and particularly preferably an alkyl group having 3 carbon atoms.
  • general formulas (LC3-11) to (LC5-14) in order to increase the absolute value of dielectric anisotropy, general formula (LC3-11), general formula (LC4-11), Formula (LC5-11), general formula (LC3-13), general formula (LC4-13) and general formula (LC5-13) are preferred, and general formula (LC3-11), general formula (LC4-11), general formula Formula (LC5-11) is more preferred.
  • the liquid crystal layer in the liquid crystal display element of the present invention preferably contains one or more compounds represented by the general formulas (LC3-11) to (LC5-14), and contains one or two compounds. It is more preferable to include one or two compounds represented by the general formula (LC3-1).
  • R 51 to R 53 are an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms.
  • R 61 to R 63 represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms.
  • B 1 to B 3 each represents a 1,4-phenylene group or trans-1,4-cyclohexylene group which may be fluorine-substituted
  • Z 41 to Z 43 each represents a single bond, —CH ⁇ CH—, —C ⁇ C—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —COO—, —OCO—, —OCH 2 —, —CH 2 O—, —OCF 2 — or —CF 2 O— the stands
  • X 42 represents a hydrogen atom or a fluorine atom
  • Z 4 It is -CH 2 - represents an or an oxygen atom). It is preferable to contain at least one compound selected from the group of compounds represented by:
  • R 51 to R 53 are each an alkyl group having 1 to 8 carbon atoms, and an alkenyl having 2 to 8 carbon atoms.
  • Group, an alkoxy group having 1 to 8 carbon atoms or an alkenyloxy group having 2 to 8 carbon atoms preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms. More preferably, it represents an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 4 carbon atoms, and more preferably represents an alkyl group having 3 to 5 carbon atoms or an alkenyl group having 2 carbon atoms. And particularly preferably an alkyl group having 3 carbon atoms.
  • R 61 to R 63 represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms, It preferably represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms.
  • it represents an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms, more preferably represents an alkyl group having 3 carbon atoms or an alkoxy group having 2 carbon atoms, and has 2 carbon atoms. It is particularly preferred to represent an alkoxy group.
  • B 31 to B 33 each represents a 1,4-phenylene group or trans-1,4-cyclohexylene group, which may be substituted with fluorine, but is an unsubstituted 1,4-phenylene group or trans-1,4- A cyclohexylene group is preferred, and a trans-1,4-cyclohexylene group is more preferred.
  • Z 41 to Z 43 are a single bond, —CH ⁇ CH—, —C ⁇ C—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —COO—, —OCO—, —OCH 2 —, — CH 2 O—, —OCF 2 — or —CF 2 O— represents a single bond, —CH 2 CH 2 —, —COO—, —OCH 2 —, —CH 2 O—, —OCF 2 — or — It preferably represents CF 2 O—, and more preferably represents a single bond or —CH 2 O—.
  • the compound represented by the general formula (LC3-2), the general formula (LC3-3), the general formula (LC4-2), and the general formula (LC5-2) is contained in an amount of 10 to 60% by mass in the liquid crystal composition. However, it is preferable to contain 20 to 50% by mass, more preferably 25 to 45% by mass, more preferably 28 to 42% by mass, and more preferably 30 to 40% by mass. Further preferred.
  • the compound represented by the general formula (LC3-2) is preferably a compound represented by the following general formula (LC3-21) to general formula (LC3-29).
  • the compounds represented by the following general formula (LC3-31) to general formula (LC3-33) are also preferable.
  • R 51 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms
  • R 61a represents an alkyl group having 1 to 5 carbon atoms.
  • the compound represented by the general formula (LC4-2) is preferably a compound represented by the following general formula (LC4-21) to general formula (LC4-26).
  • the compound represented by the general formula (LC5-2) is preferably a compound represented by the following general formula (LC5-21) to general formula (LC5-26).
  • R 53 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms
  • R 63a represents an alkyl group having 1 to 5 carbon atoms
  • W 2 represents —CH 2 -Represents an oxygen atom
  • R 61a to R 63a are preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 or 2 carbon atoms, and particularly preferably an alkyl group having 2 carbon atoms.
  • R 51 to R 53 represent general formula (LC3-2), general formula (LC4-2), and general formula (LC5- Similar embodiments in 2) are preferred.
  • R 61a to R 63a are preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 or 3 carbon atoms, and particularly preferably an alkyl group having 3 carbon atoms.
  • general formula (LC3-21), general formula (Lc3-22) and general formula Formula (LC3-25) in order to increase the absolute value of dielectric anisotropy, general formula (LC3-21), general formula (Lc3-22) and general formula Formula (LC3-25), Formula (LC4-21), Formula (LC4-22) and Formula (LC4-25), Formula (LC5-21), Formula (LC5-22) and Formula (LC LC5-25) is preferred.
  • the compounds represented by the general formula (LC3-2), the general formula (Lc4-2) and the general formula (LC5-2) can be contained in one kind or two or more kinds, but B 1 to B 3 are 1, It is preferable to contain at least one compound each representing a 4-phenylene group and a compound in which B 1 to B 3 represent a trans-1,4-cyclohexylene group.
  • R LC31 , R LC32 , A LC31 and Z LC31 each independently represent the same meaning as R LC31 , R LC32 , A LC31 and Z LC31 in the general formula (LC3)
  • X LC3b1 to X LC3b6 are Represents a hydrogen atom or a fluorine atom, and at least one of X LC3b1 and X LC3b2 or X LC3b3 and X LC3b4 represents a fluorine atom, m LC3a1 is 1, 2 or 3, and m LC3b1 is 0 or 1 and when there are a plurality of A LC31 and Z LC31 , they may be the same or different.) Or one or more compounds selected from the group of compounds represented by Is preferred.
  • R LC31 and R LC32 each independently represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkenyloxy group having 2 to 7 carbon atoms. Is preferably represented.
  • a LC31 preferably represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group, a tetrahydropyran-2,5-diyl group, or a 1,3-dioxane-2,5-diyl group.
  • 4-phenylene group and trans-1,4-cyclohexylene group are more preferable.
  • Z LC31 is a single bond, -CH 2 O -, - COO -, - OCO -, - CH 2 CH 2 - is preferred to represent, and more preferably a single bond.
  • the general formula (LC3-a) preferably represents the following general formula (LC3-a1).
  • R LC31 and R LC32 each independently represent the same meaning as R LC31 and R LC32 in General Formula (LC3).
  • R LC31 and R LC32 are each independently preferably an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms, and R LC31 has 1 carbon atom. More preferably, it represents an alkyl group of ⁇ 7 , and R LC32 represents an alkoxy group of 1 to 7 carbon atoms.
  • the general formula (LC3-b) is preferably represented by the following general formula (LC3-b1) to general formula (LC3-b12).
  • the general formula (LC3-b1), the general formula (LC3-b6), the general formula (LC3-b8) and general formula (LC3-b11) are more preferable, general formula (LC3-b1) and general formula (LC3-b6) are more preferable, and general formula (LC3-b1) is Most preferably it represents.
  • R LC31 and R LC32 each independently represent the same meaning as R LC31 and R LC32 in General Formula (LC3).
  • R LC31 and R LC32 are each independently preferably an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms, and R LC31 has 2 carbon atoms. Or an alkyl group having 3 carbon atoms, and more preferably R LC32 represents an alkyl group having 2 carbon atoms.
  • the compound represented by the general formula (LC4) is preferably a compound represented by the following general formula (LC4-a) to general formula (LC4-c), and the compound represented by the general formula (LC5) is Compounds represented by the following general formula (LC5-a) to general formula (LC5-c) are preferable.
  • R LC41, R LC42 and X LC41 each independently represent the same meaning as R LC41, R LC42 and X LC41 in the general formula (LC4)
  • R LC51 and R LC52 is the general independently It represents the same meaning as R LC51 and R LC52 in formula (LC5)
  • R LC41, R LC42, R LC51 and R LC52 each independently represents an alkyl group of 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, the number alkenyl group or a carbon atom of 2 to 7 carbon atoms 2 It preferably represents ⁇ 7 alkenyloxy groups.
  • Z LC4a1 to Z LC5c1 each independently preferably represents a single bond, —CH 2 O—, —COO—, —OCO— , —CH 2 CH 2 —, and more preferably represents a single bond.
  • the compound represented by the general formula (LC) is selected from the compounds represented by the following general formula (LC6) (excluding compounds represented by the general formula (LC1) to the general formula (LC5)). It is also preferable that it is 1 type, or 2 or more types of compounds.
  • R LC61 and R LC62 each independently represent an alkyl group having 1 to 15 carbon atoms.
  • One or more CH 2 groups in the alkyl group are —O—, —CH ⁇ CH—, —CO—, —OCO—, —COO— or —C, so that the oxygen atom is not directly adjacent.
  • ⁇ C— may be substituted, and one or more hydrogen atoms in the alkyl group may be optionally halogen substituted.
  • R LC61 and R LC62 are each independently an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or 2 to 7 carbon atoms.
  • the alkenyl group is preferably represented by any one of the following structures.
  • a LC61 to A LC63 each independently represent any one of the following structures.
  • one or more CH 2 CH 2 groups in the cyclohexylene group may be substituted with —CH ⁇ CH—, —CF 2 O—, —OCF 2 —.
  • One or two or more CH groups in the phenylene group may be substituted with a nitrogen atom.
  • a LC61 to A LC63 each independently preferably have any one of the following structures.
  • Z LC61 and Z LC62 are each independently a single bond, —CH ⁇ CH—, —C ⁇ C— , —CH 2 CH 2 —, — (CH 2 ) 4 —, —COO—. , -OCH 2 -, - CH 2 O -, - OCF 2 - or -CF 2 O-a represents, MLC61 represents 0-3.
  • Z LC61 and Z LC62 are each independently a single bond, —CH 2 CH 2 —, —COO— , —OCH 2 —, —CH 2 O—, —OCF 2 -Or -CF 2 O- is preferred.
  • the compound represented by the general formula (LC6) is one or more compounds selected from the group consisting of compounds represented by the following general formula (LC6-a) to general formula (LC6-v) Is preferred.
  • R LC61 and R LC62 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, carbon An alkenyl group having 2 to 7 atoms or an alkenyloxy group having 2 to 7 carbon atoms is represented.
  • polymerizable compound examples include a monofunctional polymerizable compound having one reactive group, and a polyfunctional polymerizable compound having two or more reactive groups such as bifunctional or trifunctional. Can be mentioned.
  • the polymerizable compound having a reactive group may or may not contain a mesogenic moiety.
  • the reactive group is preferably a substituent having photopolymerizability.
  • the reaction of the polymerizable compound having a reactive group can be suppressed during the thermal polymerization of the vertical alignment film material. Substituents are particularly preferred.
  • the polymerizable compound according to the present invention includes the following general formula (P)
  • Z p1 is a carbon atom in which a fluorine atom, a cyano group, a hydrogen atom, or a hydrogen atom may be substituted with a halogen atom.
  • R p1 and R p2 are each independently the following formulas (RI) to (R-IX):
  • R 2 to R 6 are independently of each other a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or the number of carbon atoms. 1 to 5 halogenated alkyl groups, W is a single bond, —O— or a methylene group, T is a single bond or —COO—, and p, t and q are each independently 0, Represents 1 or 2, Sp p1 and Sp p2 each represent a spacer group, and each of Sp p1 and Sp p2 independently represents a single bond, an alkylene group having 1 to 12 carbon atoms, or —O— (CH 2 ) s — (wherein s is L p1 and L p2 each independently represent a single bond, —O—, —S—, —CH 2 —, an integer of 1 to 11 and an oxygen atom is bonded to an aromatic ring.
  • M p3 represents the following formulas (i-13) to (ix-13):
  • m p2 to m p4 each independently represents 0, 1, 2 or 3
  • m p1 and m p5 each independently represent 1, 2 or 3, but when there are a plurality of Z p1 May be the same or different.
  • R p1 When a plurality of R p1 are present, they may be the same or different.
  • R p2 When a plurality of R p2 are present, they may be the same.
  • Z p1 is preferably -Sp p2 -R p2
  • R 11 and R 12 are each independently represented by the formulas (R-1) to (R-3). Either is preferable.
  • m p1 + m p5 is preferably 2 or more.
  • L p1 represents a single bond, —OCH 2 —, —CH 2 O—, —CO—, —C 2 H 4 —, —COO—, —OCO—, —COOC 2.
  • H 4 -, - OCOC 2 H 4 -, - C 2 H 4 OCO -, - C 2 H 4 COO -, - CH CH -, - CF 2 -, - CF 2 O -, - (CH 2) z —C ( ⁇ O) —O—, — (CH 2 ) z—O— (C ⁇ O) —, —O— (C ⁇ O) — (CH 2 ) z—, —CH ⁇ CH—COO—, —COO—CH ⁇ CH—, —OCOCH ⁇ CH—, — (C ⁇ O) —O— (CH 2 ) z—, —OCF 2 — or —C ⁇ C—, and L p2 represents
  • At least one of L p1 and L p2 in the general formula (P) is — (CH 2 ) z —C ( ⁇ O) —O— or — (CH 2 ) z—O— (C ⁇ O). It is preferably at least one selected from the group consisting of — and —O— (C ⁇ O) — (CH 2 ) z— and — (C ⁇ O) —O— (CH 2 ) z—.
  • R p1 and R p2 are each independently the following formulas (R-1) to (R-15):
  • m p3 represents 0, 1, 2, or 3.
  • L p1 is a single bond
  • m p2 is 2 or 3, a plurality of L p1 is present. At least one is preferably a single bond.
  • m p3 represents 0, 1, 2 or 3, and when m p3 is 1, M p2 is a 1,4-phenylene group, and when m p3 is 2 or 3, a plurality of them are present.
  • m p3 in the general formula (P) represents 0, 1, 2, or 3, and at least one of M p2 is a 1,4-phenylene group substituted with one or two or more fluorines. It is preferable.
  • m p4 in the general formula (P) represents 0, 1, 2 or 3, and at least one of M p3 is a 1,4-phenylene group substituted with one or two or more fluorines. It is preferable.
  • the spacer group (Sp p1 , Sp p2 , Sp p4 ) in the general formula (P) is a single bond, —OCH 2 —, — (CH 2 ) z O—, —CO—, —C 2 H 4.
  • the polymerizable compound of the general formula (P) according to the present invention is represented by the general formula (Pa), the general formula (Pb), the general formula (Pc), and the general formula (Pd). It is preferably at least one compound selected from the group consisting of compounds (excluding the compound represented by the general formula (1)).
  • R p1 and R p2 are each independently the following formulas (RI) to (R-IX):
  • R 2 to R 6 are independently of each other a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or the number of carbon atoms. 1 to 5 halogenated alkyl groups, W is a single bond, —O— or a methylene group, T is a single bond or —COO—, and p, t and q are each independently 0, Represents 1 or 2, Ring A and Ring B are each independently 1,4-phenylene group, 1,4-cyclohexylene group, anthracene-2,6-diyl group, phenanthrene-2,7-diyl group, pyridine-2,5- Diyl group, pyrimidine-2,5-diyl group, naphthalene-2,6-diyl group, indan-2,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or 1, Represents
  • Sp p1 and Sp p4 each represent a spacer group
  • X p1 to X p4 preferably each independently represent a hydrogen atom or a halogen atom
  • L p3 is preferably —CH ⁇ CHCOO—, —COOCH ⁇ CH— or —OCOCH ⁇ CH—.
  • R p1 When a plurality of R p1 are present, they may be the same or different.
  • R p1 When a plurality of R p1 are present, they may be the same or different, and a plurality of R p2 are present. In some cases, they may be the same or different.
  • a plurality of Sp p1 When a plurality of Sp p1 are present, they may be the same or different.
  • Sp p4 When there are a plurality of Sp p4 , they are the same. They may be the same or different when there are a plurality of L p4 and L p5, and they may be the same when there are a plurality of rings A to C Or different.
  • Preferred examples of the compound represented by formula (Pb) according to the present invention include the following compounds.
  • Preferred examples of the compound represented by the general formula (Pc) according to the present invention include the following compounds.
  • the compound represented by the general formula (Pd) according to the present invention is preferably a compound represented by the following general formula (P-d ').
  • the “alkyl group having 1 to 15 carbon atoms” according to the present invention is preferably a linear or branched alkyl group, and more preferably a linear alkyl group.
  • R 1 and R 2 are each independently an alkyl group having 1 to 15 carbon atoms, and R 1 and R 2 are each independently 1 to 1 carbon atoms. Eight alkyl groups are preferred, and alkyl groups having 1 to 6 carbon atoms are more preferred.
  • alkyl group having 1 to 15 carbon atoms examples include methyl group, ethyl group, propyl group, butyl group, isopropyl group, isobutyl group, t-butyl group, 3-pentyl group, isopentyl group.
  • examples of alkyl groups are common and are appropriately selected from the above examples depending on the number of carbon atoms of each alkyl group.
  • Examples of the “alkoxy group having 1 to 15 carbon atoms” according to the present invention are preferably present at a position where at least one oxygen atom in the substituent is directly bonded to the ring structure.
  • Group, propoxy group (n-propoxy group, i-propoxy group), butoxy group, pentyloxy group, octyloxy group and decyloxy group are more preferable.
  • the example of an alkoxy group is common and is suitably selected from the said illustration according to the number of carbon atoms of each alkoxy group.
  • alkenyl group having 2 to 15 carbon atoms examples include vinyl group, allyl group, 1-propenyl group, isopropenyl group, 2-butenyl group, 3-butenyl group, 1,3-butadienyl. Group, 2-pentenyl group, 3-pentenyl group, 2-hexenyl group and the like. More preferable alkenyl groups according to the present invention include the following formula (i) (vinyl group), formula (ii) (1-propenyl group), formula (iii) (3-butenyl group) and formula (iv) ) (3-pentenyl group):
  • examples of the polymerizable compound having a monofunctional reactive group that is preferable for increasing the solubility with a low-molecular liquid crystal and suppressing crystallization include the following general formula (VI):
  • X 3 represents a hydrogen atom or a methyl group
  • Sp 3 represents a single bond, an alkylene group having 1 to 12 carbon atoms, or —O. — (CH 2 ) t — (wherein t represents an integer of 2 to 11 and an oxygen atom is bonded to an aromatic ring)
  • V represents a straight or branched chain having 2 to 20 carbon atoms
  • the alkylene group in the polyvalent alkylene group may be substituted with an oxygen atom within a range in which the oxygen atom is not adjacent, 5 to 20 alkyl groups (the alkylene group in the group may be substituted with an oxygen atom within a range in which the oxygen atom is not adjacent) or a cyclic substituent
  • W is a hydrogen atom or a halogen atom Or an alkyl
  • X 3 represents a hydrogen atom or a methyl group.
  • a hydrogen atom is preferred, and when importance is placed on reducing the residual amount of reaction, a methyl group is preferred. preferable.
  • Sp 3 represents a single bond, an alkylene group having 1 to 12 carbon atoms, or —O— (CH 2 ) t — (wherein t represents an integer of 2 to 11, Represents the bond to the aromatic ring), but the length of the carbon chain affects Tg, so when the polymerizable compound content is less than 10% by weight, it is preferably not too long.
  • a bond or an alkylene group having 1 to 5 carbon atoms is preferred.
  • the polymerizable compound content is less than 6% by weight, a single bond or an alkylene group having 1 to 3 carbon atoms is more preferred.
  • an alkylene group having 5 to 10 carbon atoms is preferable.
  • t is preferably 1 to 5, and more preferably 1 to 3. Furthermore, it is preferable to use a mixture of a plurality of number of carbon atoms of Sp 3 are different polymerizable compounds such that the desired pre-tilt angle as needed so affects the pretilt angle can be obtained carbon atoms.
  • V represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent cyclic substituent having 5 to 30 carbon atoms, and an alkylene group in the polyvalent alkylene group. May be substituted with an oxygen atom in the range where the oxygen atom is not adjacent, and an alkyl group having 5 to 20 carbon atoms (the alkylene group in the group may be substituted with an oxygen atom within the range where the oxygen atom is not adjacent) .) Or may be substituted with a cyclic substituent, and is preferably substituted with two or more cyclic substituents.
  • polymerizable compound represented by the general formula (VI) is represented by the general formula (X1a).
  • a 1 represents a hydrogen atom or a methyl group
  • a 2 represents a single bond or an alkylene group having 1 to 8 carbon atoms (one or two or more methylene groups in the alkylene group are each independently an oxygen atom, assuming that oxygen atoms are not directly bonded to each other, -CO-, -COO- or -OCO- may be substituted, and one or more hydrogen atoms in the alkylene group are each independently substituted with a fluorine atom, a methyl group or an ethyl group.
  • a 3 and A 6 are each independently a hydrogen atom, a halogen atom or an alkyl group having 1 to 10 carbon atoms (one or two or more methylene groups in the alkyl group are such that oxygen atoms are not directly bonded to each other) And each independently may be substituted with an oxygen atom, —CO—, —COO— or —OCO—, and one or more hydrogen atoms in the alkyl group are each independently a halogen atom. Which may be substituted with an atom or an alkyl group having 1 to 17 carbon atoms).
  • a 4 and A 7 are each independently a hydrogen atom, a halogen atom, or an alkyl group having 1 to 10 carbon atoms (one or two or more methylene groups in the alkyl group are such that oxygen atoms are not directly bonded to each other) And each independently may be substituted with an oxygen atom, —CO—, —COO— or —OCO—, and one or more hydrogen atoms in the alkyl group are each independently a halogen atom. Which may be substituted with an atom or an alkyl group having 1 to 9 carbon atoms).
  • B 1 , B 2 and B 3 are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms (one or two or more methylene groups in the alkyl group are).
  • each may be independently substituted with an oxygen atom, —CO—, —COO— or —OCO—, and one or more of the alkyl groups may be substituted.
  • each of the hydrogen atoms may be independently substituted with a halogen atom or a trialkoxysilyl group having 3 to 6 carbon atoms.
  • the general formula (X1a) is preferably a compound represented by the general formula (II-b).
  • the compounds represented by the general formula (II-b) are specifically compounds represented by the following formulas (II-q) to (II-z), (II-aa) to (II-al). It is preferable.
  • the compounds represented by the above general formula (VI), general formula (XaI) and general formula (II-b) may be one kind or two or more kinds.
  • a 8 represents a hydrogen atom or a methyl group, and the 6-membered rings T 1 , T 2, and T 3 are each independently selected.
  • Y 1 and Y 2 are each independently a single bond, —CH 2 CH 2 —, —CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C ⁇ C—, —CH ⁇ CH—.
  • Y 3 and Y 4 are each independently a single bond, an alkylene group having 1 to 12 carbon atoms (one or two or more methylene groups in the alkylene group are such that oxygen atoms are not directly bonded to each other, Each independently may be substituted with an oxygen atom, —CO—, —COO— or —OCO—, and one or more hydrogen atoms in the alkylene group are each independently a fluorine atom, a methyl group, Or may be substituted with an ethyl group).
  • B 8 represents a hydrogen atom, a cyano group, a halogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkylene group having a terminal acryloyl group or methacryloyl group.
  • e and f each independently represent an integer of 1 to 12
  • R 34 represents a hydrogen atom or a methyl group.
  • polymerizable compound represented by the general formula (VI) is specifically the general formula (X1c).
  • R 70 represents a hydrogen atom or a methyl group
  • R 71 represents a hydrocarbon group having a condensed ring
  • examples of the polymerizable compound having a multifunctional reactive group that is preferable for increasing the solubility with a low-molecular liquid crystal and suppressing crystallization include the following general formula (V):
  • X 1 and X 2 each independently represent a hydrogen atom or a methyl group
  • Sp 1 and Sp 2 each independently represent a simple group.
  • U represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent cyclic substituent having 5 to 30 carbon atoms
  • the alkylene group in the polyvalent alkylene group has a range in which oxygen atoms are not adjacent to each other.
  • an alkyl group having 5 to 20 carbon atoms (the alkylene group in the group may be substituted with an oxygen atom within the range in which the oxygen atom is not adjacent) or a cyclic substituent. May be substituted, k is 1 to 5 All 1,4-phenylene groups in.
  • the formula represents an integer, the polymerization in which arbitrary hydrogen atom is represented by -CH 3, -OCH 3, fluorine atom, or may be substituted by a cyano group.) are preferred.
  • X 1 and X 2 each independently represent a hydrogen atom or a methyl group.
  • a hydrogen atom is preferable, and importance is placed on reducing the amount of residual reaction. In this case, a methyl group is preferred.
  • Sp 1 and Sp 2 are each independently a single bond, an alkylene group having 1 to 12 carbon atoms, or —O— (CH 2 ) s — (wherein s is 2 to 11). In which the oxygen atom is bonded to an aromatic ring.)
  • the pretilt angle in the liquid crystal display element of the present invention is the number of carbon atoms, the content with liquid crystal, and the alignment film used. It is affected by the type and orientation processing conditions.
  • the carbon chain is preferably not so long, a single bond or an alkylene group having 1 to 5 carbon atoms is more preferable, and a single bond Alternatively, an alkylene group having 1 to 3 carbon atoms is more preferable.
  • a polymerizable compound having 6 to 12 carbon atoms, and more preferably 8 to 10 carbon atoms.
  • Sp 1 and Sp 2 represent —O— (CH 2 ) s —, it affects the pretilt angle, so it is preferable to adjust the lengths of Sp 1 and Sp 2 as necessary.
  • s is preferably from 1 to 5, and more preferably from 1 to 3.
  • s is preferably 6 to 10.
  • at least one of Sp 1 and Sp 2 is a single bond, a molecular asymmetry is exhibited, which is preferable because pretilt is induced.
  • a compound in which Sp 1 and Sp 2 are the same in the general formula (V) is also preferable, and it is preferable to use two or more compounds in which Sp 1 and Sp 2 are the same. In this case, it is more preferable to use two or more different Sp 1 and Sp 2 from each other.
  • U represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent cyclic substituent having 5 to 30 carbon atoms
  • an alkylene group in the polyvalent alkylene group May be substituted with an oxygen atom in the range where the oxygen atom is not adjacent, and an alkyl group having 5 to 20 carbon atoms (the alkylene group in the group may be substituted with an oxygen atom within the range where the oxygen atom is not adjacent)
  • May be substituted with a cyclic substituent and is preferably substituted with two or more cyclic substituents.
  • U preferably specifically represents the following formulas (Va-1) to (Va-13).
  • biphenyl having high linearity is preferable, and it is preferable to express the formula (Va-1) to the formula (Va-6).
  • the structure representing the formula (Va-6) to the formula (Va-11) is preferable in terms of high solubility with liquid crystal, and is used in combination with the formula (Va-1) to the formula (Va-6). preferable.
  • C ⁇ C- or all of the 1,4-phenylene group represents in formula single bond
  • Any hydrogen atom is —CH 3 , —OCH 3 , a fluorine atom, or a cyano group
  • one or more CH 2 CH 2 groups in the cyclohexylene group may be substituted with —CH ⁇ CH—, —CF 2 O—, —OCF 2 —. May be good.
  • U has a ring structure, at least one of Sp 1 and Sp 2 is —O— (CH 2 ) s — (wherein s represents an integer of 1 to 7, and an oxygen atom is bonded to an aromatic ring) It is preferable that both are —O— (CH 2 ) s —.
  • k represents an integer of 1 to 5, but k is preferably a bifunctional compound of 1 or k is a trifunctional compound of 2, more preferably a bifunctional compound. .
  • the compound represented by the general formula (V) is preferably a compound represented by the following general formula (Vb).
  • X 1 and X 2 each independently represent a hydrogen atom or a methyl group
  • Sp 1 and Sp 2 each independently represent carbon.
  • Z 1 Or Z 2 represents —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CH ⁇ CH—COO—, —CH ⁇ CH—OCO—, —COO—CH ⁇ CH—, —OCO—CH ⁇ CH—, —COO—CH 2 CH 2 —, —OCO—CH 2 CH 2 —, —CH 2 CH 2 -COO -, - CH 2 CH
  • a compound in which one represents a hydrogen atom and the other represents a methyl group is also preferable.
  • diacrylate derivatives are the fastest, dimethacrylate derivatives are slow, asymmetric compounds are in the middle, and a preferred embodiment can be used depending on the application.
  • Sp 1 and Sp 2 each independently represents an alkylene group having 1 to 12 carbon atoms or —O— (CH 2 ) s—, but at least one of them is —O— (CH 2 ) s- is preferred, and an embodiment in which both represent -O- (CH 2 ) s- is more preferred.
  • s is preferably 1-6.
  • Z 1 or Z 2 represents —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CH ⁇ CH—COO—, —CH ⁇ CH—OCO—, —COO—CH ⁇ CH—, —OCO—CH ⁇ CH—, —COO—CH 2 CH 2 —, —OCO—CH 2 CH 2 —, —CH 2 CH 2 —COO—, —CH 2 CH 2 —OCO—, —COO—CH 2 —, —OCO—CH 2 —, —CH 2 —COO—, —CH 2 —OCO—, —CY 1 ⁇ CY 2 — (Y 1 and Y 2 each independently represents a hydrogen atom or a fluorine atom), —C ⁇ C— or a single bond, —OCH 2 —, —CY 1
  • C represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond in which any hydrogen atom may be substituted with a fluorine atom.
  • -A phenylene group or a single bond is preferred.
  • Z 1 and Z 2 are also preferably a linking group other than a single bond, and when C is a single bond, Z 1 and Z 2 are preferably a single bond.
  • C represents a single bond and the ring structure is formed of two rings.
  • Specific examples of the polymerizable compound having a ring structure include the following general formula: Compounds represented by (V-1) to (V-6) are preferred, compounds represented by general formulas (V-1) to (V-4) are particularly preferred, and compounds represented by general formula (V-2) Most preferred are the compounds
  • the compounds represented by the following general formulas (V1-1) to (V1-5) are preferable for improving the solubility in the liquid crystal composition, and the general formula (V1-1) ) Is particularly preferred.
  • q1 and q2 each independently represents an integer of 1 to 12, and R 3 represents a hydrogen atom or a methyl group.
  • a compound represented by the following general formula (Vc) is preferable in terms of increasing the reaction rate, and the pretilt angle is thermally stable. This is preferable.
  • a desired pretilt angle can be obtained by adjusting the number of carbon atoms of Sp 1 , Sp 2 and Sp 3 as necessary. The relationship between pretilt and the number of carbon atoms shows the same tendency as in the case of two functional groups.
  • X 1 , X 2 and X 3 each independently represents a hydrogen atom or a methyl group
  • Sp 1 , Sp 2 and Sp 3 each independently represents an alkylene group having 1 to 12 carbon atoms or —O— (CH 2 ) s —
  • Z 11 represents —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CH ⁇ CH—COO—, —CH ⁇ CH— OCO—, —COO—CH ⁇ CH—, —OCO—CH ⁇ CH—, —COO—CH 2 CH 2 —, —OCO—CH 2 CH 2 —, —CH 2 CH 2 —COO—, —CH 2 CH 2 -OCO -, - COO-
  • X 1 and X 2 each independently represent a hydrogen atom or a methyl group
  • Sp 1 and Sp 2 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH 2 ).
  • s 2 (wherein s represents an integer of 1 to 7 and an oxygen atom is bonded to an aromatic ring)
  • Z 1 represents —N ⁇ N—
  • C represents 1,4-phenylene.
  • a group, a trans-1,4-cyclohexylene group (any hydrogen atom may be substituted by a fluorine atom) or a compound representing a single bond is preferable.
  • Rn1 and Rn2 each independently represent a hydrogen atom or a methyl group, and in the formula, pn and qn each independently represents an integer of 1 to 12.
  • a compound having an aryloxycarbonyl skeleton is preferably used as the liquid crystalline compound that generates radicals by light or heat used in the present invention.
  • the radical generation mechanism of a compound having an aryloxycarbonyl skeleton by light is shown below.
  • Ring A is 1,4-phenylene group, 1,4-cyclohexylene group, anthracene-2,6-diyl group, phenanthrene-2,7-diyl group, pyridine-2,5-diyl group, pyrimidine-2,5 -Represents a diyl group or a naphthalene-2,6-diyl group, and the hydrogen atom present in ring A may be substituted with a halogen atom or an alkoxyl group.
  • rings A, B and C are 1,4-phenylene group, 1,4-cyclohexylene group, anthracene-2,6-diyl group, phenanthrene-2,7-diyl group, pyridine-2,5-diyl.
  • Group, a pyrimidine-2,5-diyl group, a naphthalene-2,6-diyl group, and the hydrogen atom present in the rings A, B, and C may be substituted with a halogen atom or an alkoxyl group.
  • X 1 to X 5 each independently represents a single bond, —O—, —CO—, —OCO— or —COO—, wherein Z 1 and Z 2 are —COO—, —OCO—, —CH 2 CH 2 —, —CH ⁇ CH—, —C ⁇ C—, —CF ⁇ CF—, —CH 2 CH 2 —, — (CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O—, —OCF 2 —, —COO— or —OCO— is represented.
  • X 1 to X 5 and Z 1 to Z 2 is —COO— or —OCO— and is not contained in the carbonyl group in —COO— or —OCO—.
  • R 1 to R 5 each independently represents hydrogen or an alkylene group having 1 to 12 carbon atoms, and one or more hydrogen atoms in hydrogen or the alkyl may be substituted with —P And one or more methylene groups in the alkyl are each independently substituted with —CH ⁇ CH—, —CO—, —O—, P—, assuming that the oxygen atoms are not directly bonded to each other.
  • P may represent a polymerizable group.
  • n1 to n3 represent 0, 1, 2, 3 or 4, and n represents 0, 1, 2 or 3.
  • the liquid crystalline compound that generates radicals by light or heat used in the present invention is preferably contained in an amount of 0.1 to 10% by mass, and preferably 0.5 to 5% by mass based on the total weight of the polymerizable composition and the liquid crystal composition. % Is more preferable, and 1.0 to 3% by mass is particularly preferable.
  • the liquid crystalline compound having a function of generating radicals by light or heat used in the present invention may or may not have a polymerizable functional group, but the viewpoint of ensuring the stability and reliability of the device It is preferable to have from.
  • the number of polymerizable functional groups contained in one molecule is preferably 1 to 6, more preferably 2 to 3, and particularly preferably 2.
  • Such a compound is preferably 0.1 to 10% by mass, more preferably 1.5 to 9% by mass based on the total weight of the polymerizable composition and the liquid crystal composition. It is particularly preferable to contain 8% by mass.
  • the liquid crystal compound having a function of generating radicals by light or heat used in the present invention preferably has no polymerizable functional group from the viewpoint of realizing a low driving voltage of the liquid crystal display element.
  • the maximum addition amount concentration in the polymerizable liquid crystal composition is preferably 10% by mass or less, preferably 7% by mass or less, and preferably 5% by mass or less. If the amount added is large, the stability and reliability of the liquid crystal display element and the voltage holding ratio tend to deteriorate.
  • a compound having a polymerizable functional group and a compound having no polymerizable functional group may be used in combination.
  • the following compounds are preferable.
  • Polymerization initiator As the polymerization method of the polymerizable compound used in the present invention, radical polymerization, anionic polymerization, cationic polymerization, etc. can be used, but polymerization is preferably performed by radical polymerization, radical polymerization by photo-Fries rearrangement, and initiation of photopolymerization. Radical polymerization with an agent is more preferred.
  • radical polymerization initiator a thermal polymerization initiator or a photopolymerization initiator can be used, but a photopolymerization initiator is preferable. Specifically, the following compounds are preferable.
  • the polymerizable liquid crystal composition used in the present invention preferably contains the liquid crystal composition exemplified above and 1% by mass or more and less than 10% by mass polymerizable compound exemplified above.
  • the lower limit of the content is preferably 2% by mass or more, and the upper limit is preferably less than 9% by mass, more preferably less than 7% by mass, more preferably less than 5% by mass, and more preferably less than 4% by mass.
  • the polymerizable liquid crystal composition used in the present invention preferably contains the liquid crystal composition exemplified above and 10% by mass or more and less than 40% by mass polymerizable compound exemplified above.
  • the lower limit of the content of the polymerizable compound is preferably 9% by mass or more, more preferably 10% by mass or more, and the upper limit is preferably less than 30% by mass, more preferably less than 25% by mass, and less than 20% by mass. More preferably, it is less than 15% by mass.
  • the polymerizable liquid crystal composition used in the present invention preferably contains the liquid crystal composition exemplified above and the polymerizable compound exemplified above in an amount of 5% by mass or more and less than 15% by mass, and 7% by mass. It is more preferable to contain a polymerizable compound in an amount of not less than 12% and less than 12%.
  • the polymerizable liquid crystal composition used in the present invention contains 1% by mass or more and less than 40% by mass of a polymerizable compound, so that uniaxial optical anisotropy or uniaxial refractive index anisotropy or easy alignment is achieved. It is preferable to form a polymer network having an axial direction, and it is more preferable that the optical axis or the easy alignment axis of the polymer network and the easy alignment axis of the low-molecular liquid crystal are substantially aligned.
  • the polymer network includes a polymer binder in which a polymer thin film is formed by aggregating a plurality of polymer networks.
  • the polymer binder has refractive index anisotropy indicating uniaxial orientation, low molecular liquid crystal is dispersed in the thin film, and the uniaxial optical axis of the thin film and the optical axis of the low molecular liquid crystal are in substantially the same direction.
  • the feature is that it is complete. Therefore, unlike a polymer dispersion type liquid crystal or polymer network type liquid crystal which is a light scattering type liquid crystal, light scattering does not occur and a high contrast display can be obtained in a liquid crystal element using polarized light.
  • the polymerizable liquid crystal composition used in the present invention is a PSA (Polymer Sustained Alignment) that forms a polymer network layer on the entire liquid crystal element and induces a pretilt by forming a polymer thin film layer on the liquid crystal element substrate. ) Type liquid crystal composition.
  • PSA Polymer Sustained Alignment
  • Type liquid crystal composition In any concentration, it is preferable to contain at least two kinds of polymerizable compounds having different Tg and adjust Tg as necessary.
  • the polymerizable compound that is a precursor of a polymer having a high Tg is a polymerizable compound having a molecular structure that increases the crosslink density, and preferably has 2 or more functional groups.
  • the precursor of the polymer having a low Tg preferably has a structure in which the number of functional groups is 1 or 2 or more, and an alkylene group or the like is provided as a spacer between the functional groups to increase the molecular length.
  • Tg is also related to thermal mobility at the molecular level in the main chain and side chain of the polymer network, and has an influence on electro-optical properties.
  • the crosslink density when the crosslink density is increased, the molecular mobility of the main chain is lowered, the anchoring force with the low molecular liquid crystal is increased, the drive voltage is increased, and the fall time is shortened.
  • the crosslinking density is lowered so that Tg is lowered, the thermal mobility of the polymer main chain is increased, so that the anchoring force with the low-molecular liquid crystal is lowered, the driving voltage is lowered, and the fall time is increased.
  • the anchoring force at the polymer network interface is influenced by the molecular mobility of the polymer side chain in addition to the above Tg, and the polymer is obtained by using a polymerizable compound having a polyvalent branched alkylene group and a polyvalent alkyl group.
  • the anchoring force of the interface is lowered.
  • the polymerizable compound having a polyvalent branched alkylene group and a polyvalent alkyl group is effective in inducing a pretilt angle and acts in the direction of reducing the polar anchoring force.
  • the polymerizable liquid crystal composition exhibits a liquid crystal phase
  • the polymerizable compound in the polymerizable liquid crystal composition is polymerized to increase the molecular weight of the polymerizable compound to cause phase separation of the liquid crystal composition and the polymerizable compound. .
  • the form of separation into two phases varies greatly depending on the type of liquid crystal compound contained and the type of polymerizable compound.
  • a phase separation structure may be formed by binodal decomposition in which an infinite number of polymerizable compound phases are generated and grown as island-like nuclei in the liquid crystal phase, and phase separation is caused by fluctuations in concentration between the liquid crystal phase and the polymerizable compound phase.
  • a phase separation structure may be formed by spinodal decomposition.
  • the content of at least low-molecular liquid crystal is 85% by mass or more, and the size is smaller than the wavelength of visible light by using a compound having a high reaction rate of the polymerizable compound.
  • Innumerable nuclei of the polymerizable compound are generated to form a nano-order phase separation structure, which is preferable.
  • the polymerization in the polymerizable compound phase proceeds, a polymer network having a void interval shorter than the wavelength of visible light is formed depending on the phase separation structure, whereas the voids in the polymer network are caused by phase separation of the low-molecular liquid crystal phase.
  • the size of the void is smaller than the wavelength of visible light, the liquid crystal display device has high contrast, no light scattering, high contrast, strong influence of anchoring force from the polymer network, and short fall time. Is particularly preferable.
  • the nucleation of the polymerizable compound phase in the binodal decomposition is preferably adjusted as needed as affected by changes in compatibility depending on the type and combination of compounds, reaction rate, temperature and other parameters.
  • the reaction rate in the case of ultraviolet polymerization, may be adjusted as appropriate to the ultraviolet exposure conditions so as to promote the reactivity depending on the functional group of the polymerizable compound, the type and content of the photoinitiator, and the ultraviolet exposure intensity.
  • An ultraviolet exposure intensity of 20 mW / cm 2 or more is preferable.
  • spinodal decomposition a phase separation fine structure is obtained due to fluctuations in the concentration of two phases with periodicity. This is preferable because a uniform gap interval smaller than the wavelength can be easily formed. It is preferable to form the polymer network.
  • phase separation structure When the proportion of the polymerizable compound is less than 15% by mass, it is preferable to form a phase separation structure by binodal decomposition, and when it is 15% by mass or more, it is preferable to form a phase separation structure by spinodal decomposition.
  • content of the polymerizable compound When the content of the polymerizable compound is increased, there exists a phase transition temperature at which the low-molecular liquid crystal phase and the polymerizable compound phase are separated into two phases due to the influence of temperature. An isotropic phase is exhibited at a temperature higher than the two-phase separation transition temperature, but if it is low, separation occurs and a uniform phase separation structure cannot be obtained.
  • a phase separation structure When two-phase separation is performed according to temperature, it is preferable to form a phase separation structure at a temperature higher than the two-phase separation temperature.
  • a polymer network is formed while maintaining the same alignment state as that of the low-molecular liquid crystal.
  • the formed polymer network exhibits optical anisotropy so as to follow the orientation of the low-molecular liquid crystal.
  • As the form of the liquid crystal layer in the polymer network a structure in which the liquid crystal composition forms a continuous layer in the three-dimensional network structure of the polymer, a structure in which droplets of the liquid crystal composition are dispersed in the polymer, or both are mixed.
  • a pretilt angle of 0 to 90 ° is preferably induced with respect to the liquid crystal element substrate interface by the action of the polymer network.
  • the polymer network to be formed preferably has a function of aligning the coexisting low molecular liquid crystal in the alignment direction indicated by the alignment film of the liquid crystal cell, and further has a function of pretilting the low molecular liquid crystal with respect to the polymer interface direction. It is also preferable.
  • a polymerizable compound that pretilts a low-molecular liquid crystal with respect to the polymer interface is useful and preferable for lowering the driving voltage of the liquid crystal element.
  • it may have refractive index anisotropy, and it is preferable to use a polymerizable compound having a mesogenic group for the function of aligning the liquid crystal in the alignment direction.
  • a polymerizable compound having a polyvalent alkyl group having no mesogenic group that induces vertical alignment or a polyvalent branched alkylene group may be used, and a polymerizable compound having a mesogenic group Is also preferred in combination.
  • the fibrous or columnar polymer network is in the vertical direction of the low molecular liquid crystal with respect to the liquid crystal cell substrate. It is preferable that they are formed in substantially the same direction.
  • the liquid crystal is pretilted and aligned. It is preferable that a fiber-like or columnar polymer network is inclined in the same direction as the low-molecular liquid crystal.
  • the optical axis direction or the easy alignment axis direction of the columnar polymer network is a desired pretilt angle, preferably vertical alignment
  • a pretilt angle of 0.1 to 30 ° with respect to the normal direction of the transparent substrate is used for horizontal alignment.
  • a pretilt angle of 0.1 to 30 ° with respect to the horizontal direction of the transparent substrate is formed, which is more preferable.
  • the fibrous or columnar polymer network formed by any method is characterized in that the two cell substrates are connected to each other.
  • the thermal stability of the pretilt angle is improved, and the reliability of the liquid crystal display element can be increased.
  • the alkylene group between the functional group and the mesogenic group has 6 or more carbon atoms.
  • a desired pretilt angle can be induced by adjusting the compounding ratio of these compounds.
  • the trans form has a rod-like shape similar to that of the low-molecular liquid crystal and affects the alignment state of the low-molecular liquid crystal.
  • the trans isomer contained in the polymerizable liquid crystal composition of the present invention has a low molecular weight that is aligned so that the direction of ultraviolet light travels parallel to the long axis direction of the rod-shaped molecule when ultraviolet light is exposed as parallel light from the top surface of the cell.
  • the liquid crystal is aligned so as to be aligned in the molecular long axis direction of the trans form.
  • the molecular long axis of the trans body is oriented in the inclined direction, and the liquid crystal is oriented in the inclined direction of the ultraviolet rays. That is, a pre-tilt angle is induced and a photo-alignment function is exhibited.
  • the pretilt angle induced by crosslinking the polymerizable compound at this stage is fixed by a fibrous or columnar polymer network formed by polymerization phase separation.
  • the pretilt angle that is important in the VA mode is induced by a method of separating the polymerization phase while applying a voltage, a method of adding a plurality of polymerizable compounds having different induced pretilt angles, and a reversible photo-alignment function.
  • the liquid crystal element of the present invention can be produced using a method of aligning low-molecular liquid crystals and polymerizable liquid crystal compounds in the direction in which ultraviolet rays travel by using the photo-alignment function exhibited by the polymerizable compound, and separating the polymerization phase as necessary. .
  • the polymerizable compound having a photo-alignment function is preferably a photoisomeric compound that absorbs ultraviolet rays to become a trans isomer, and further, the polymerizable compound having a photo-alignment function has a reaction rate of the polymerizable compound having the photo-alignment function. It is preferably slower than the reaction rate of the polymerizable compound other than the above.
  • UV exposure is performed, the polymerizable compound having a photo-alignment function immediately becomes a trans form, and when aligned in the light traveling direction, the surrounding liquid crystal compound including the polymerizable property is aligned in the same direction.
  • the pre-tilt angle in the direction in which the UV phase propagates when the polymer phase separation proceeds and the long axis direction of the low molecular liquid crystal and the easy axis direction of the polymer network are aligned with the easy axis of the polymerizable compound having a photo-alignment function. Is induced.
  • the polymer liquid crystal composition is used for the alignment direction of the alignment film having a fibrous or columnar polymer network on the liquid crystal cell substrate surface by phase separation polymerization.
  • the low-molecular liquid crystals are aligned in parallel, but they are formed in the same direction as the refractive index anisotropy or easy-orientation axis direction of the formed fibrous or columnar polymer network and the alignment direction of the low-molecular liquid crystals. Is preferred. Furthermore, it is more preferable that the fibrous or columnar polymer network is present in substantially the entire cell except for the voids in which the low-molecular liquid crystal is dispersed.
  • the pretilt angle with respect to the polymer interface direction it is preferable to use a polyvalent alkyl group having no mesogenic group, or a polymerizable compound having a polyvalent alkylene group and a polymerizable compound having a mesogenic group.
  • the electro-optical characteristics are affected by the surface area of the polymer network interface and the gap spacing of the polymer network, it is important not to cause light scattering, and the average gap spacing is preferably smaller than the wavelength of visible light. For example, there is a method of increasing the monomer composition content in order to increase the surface area of the interface and reduce the gap interval.
  • the polymer phase is formed so that the surface area of the interface is increased by changing the polymerization phase separation structure and making the gap interval fine, and the drive voltage and the fall time are shortened.
  • the polymerization phase separation structure is also affected by the polymerization temperature.
  • the phase separation rate is greatly influenced by the compatibility between the low-molecular liquid crystal and the polymerizable compound and the polymerization rate. Since it largely depends on the molecular structure and content of the compound, it is preferable to adjust the composition as appropriate. When the compatibility is high, it is preferable to use a polymerizable compound having a high polymerization rate.
  • the ultraviolet polymerization it is preferable to increase the ultraviolet intensity. It is also preferable to increase the content of the polymerizable compound in the polymerizable liquid crystal composition.
  • the compatibility is low, the phase separation rate is sufficiently high, which is preferable for producing the liquid crystal element of the present invention.
  • a method for reducing the compatibility a method of polymerizing at a low temperature can be mentioned. When the temperature is lowered, the degree of alignment order of the liquid crystal is increased and the compatibility between the liquid crystal and the monomer is decreased, so that the polymerization phase separation rate can be increased.
  • Still another method includes a method in which the polymerizable liquid crystal composition is polymerized at a temperature showing a supercooled state.
  • the phase separation can be accelerated only by lowering the temperature by several degrees.
  • the polymer phase separation structure corresponding to the case where a monomer composition content of several tens of percent is added to the liquid crystal, that is, the surface area of the polymer network interface, which is a structure that acts to shorten the fall time, has a large gap spacing. A fine polymer network structure is formed. Therefore, it is preferable that the polymerizable liquid crystal composition of the present invention is appropriately adjusted in consideration of the alignment function, the crosslinking density, the anchoring force, and the gap interval so that the fall time is shortened.
  • a liquid crystal device using the polymerizable liquid crystal composition of the present invention it is necessary to prevent light scattering in order to obtain a high contrast display. It is important to control the phase separation structure to obtain an appropriate polymer network layer structure so as to obtain switching characteristics.
  • the polymer network layer structure will be specifically described as follows. ⁇ Continuous structure of polymer network layer> A structure in which a polymer network layer is formed on the entire surface of the liquid crystal display element in the liquid crystal phase and the liquid crystal phase is continuous, and the orientation axis of the polymer network and the uniaxial optical axis are substantially in the same direction as the orientation axis of the low-molecular liquid crystal The polymer network is preferably formed so as to induce the pretilt angle of the low-molecular liquid crystal.
  • the average gap distance of the polymer network is preferably smaller than the wavelength of visible light, preferably 800 nm or less, preferably 650 nm or less, and 450 nm or less. Is preferred. Furthermore, in order to make the fall time of the response shorter than the response time of the low-molecular liquid crystal alone due to the interaction effect (anchoring force) between the polymer network and the low-molecular liquid crystal, it is preferable to be in the range of 50 nm to 450 nm.
  • the average gap interval is in the range of around 200 nm and the upper limit is around 450 nm. It is preferable to enter.
  • the cell thickness refers to the distance between the surfaces of two substrates. Increasing the drive gap increases the average gap spacing. However, in order to suppress the increase in drive voltage to 25 V or less and shorten the fall response time, it is sufficient to enter the range from about 250 nm to 450 nm.
  • the fall response time can be improved in the range of about 5 msec to about 1 msec, which is preferable.
  • the average gap interval is in the range of about 300 nm to 450 nm. Furthermore, it is also possible to control the average gap interval of the polymer network so that the falling response time is a high-speed response of 1 msec or less.
  • the drive voltage may increase to 30 V or more, the average gap interval may be set between about 50 nm and about 250 nm, and in order to reduce it to 0.5 msec or less, it is preferable to set from about 50 nm to about 200 nm.
  • the average diameter of the polymer network is in the range of 20 nm to 700 nm, contrary to the average gap spacing.
  • the average diameter tends to increase.
  • Increasing the polymerization phase separation rate by increasing the reactivity increases the density of the polymer network and decreases the average diameter of the polymer network. Therefore, the phase separation conditions may be adjusted as necessary.
  • the average diameter is preferably 20 nm to 160 nm, and when the average gap distance is 200 nm to 450 nm, the average diameter is 40 nm to 160 nm. preferable.
  • the polymerizable compound content is greater than 10%, a range of 50 nm to 700 nm is preferable, and a range of 50 nm to 400 nm is more preferable.
  • ⁇ Discontinuous structure of polymer network layer> The distance d between two opposing substrates is determined so that the product (retardation) of the cell thickness (d) and the effective birefringence ( ⁇ n) of the liquid crystal is about 0.275 to 0.33.
  • the content of the polymerizable compound is low, and the polymer network layer is required to cover the entire cell.
  • the polymer network layer is formed discontinuously.
  • the polymerizable compound tends to gather near the liquid crystal cell substrate interface, and the polymer network layer is formed so that the polymer network grows from the substrate surface and adheres to the substrate interface.
  • a polymer network layer, a liquid crystal layer, a polymer network layer, and a counter substrate are stacked in this order from the surface.
  • Polymer having a laminated structure of polymer network layer / liquid crystal layer / polymer network layer and having a thickness of at least 0.5%, preferably 1%, more preferably 5% or more of the cell thickness in the cell cross-sectional direction
  • the cell thickness refers to the distance between the surfaces of two substrates.
  • the thickness of the polymer network layer may be increased as necessary.
  • the polymer network structure in the polymer network layer is such that the low-molecular liquid crystal and the easy-orientation axis or uniaxial optical axis are aligned in substantially the same direction, and the low-molecular liquid crystal is formed so as to induce a pretilt angle. Just do it.
  • the average gap distance is preferably in the range of 90 nm to 450 nm.
  • the content of the polymerizable compound is 1% by mass to 6% by mass, it is preferable to use a bifunctional monomer having a mesogenic group having a high anchoring force, and the polymerization rate is low with a structure having a short distance between the functional groups.
  • a fast bifunctional monomer it is preferable to form a polymer phase separation structure at a low temperature of 0 ° C. or lower.
  • the content of the polymerizable compound is from 6% by mass to less than 10% by mass, a combination of the bifunctional monomer and a monofunctional monomer having a low anchoring force is preferable, and a range of 25 ° C. to ⁇ 20 ° C. is necessary. It is preferable to form a polymer phase separation structure.
  • the melting point is room temperature or higher, it is preferable to lower the melting point by about 5 ° C. because the same effect as low temperature polymerization can be obtained.
  • a polymerizable compound having a mesogenic group having an orientation function and a relatively weak anchoring force is effective to increase the number of carbon atoms of an alkylene group between the functional group and the mesogenic group, and preferably has 5 to 10 carbon atoms.
  • liquid crystal droplets may be dispersed in the polymer binder.
  • the polymer binder has a refractive index anisotropy and is oriented on the substrate surface. It is preferable that the orientation direction indicated by the film is aligned with the optical axis direction of the polymer binder.
  • concentration of the polymerizable compound in the polymerizable liquid crystal composition the greater the anchoring force between the liquid crystal composition and the polymer interface, and the higher the ⁇ d.
  • ⁇ r decreases.
  • the concentration of the polymerizable compound in the polymerizable liquid crystal composition is 1% by mass or more and less than 40% by mass, and 2% by mass or more and 15% by mass or less. Preferably, 3 mass% or more and 8 mass% or less are more preferable.
  • the voltage holding ratio is an important characteristic.
  • the cause of lowering the voltage holding ratio is considered to be ionic impurities contained in the polymerizable liquid crystal composition.
  • mobile ions strongly influence the voltage holding ratio. Therefore, it is preferable to remove the mobile ions by performing a purification treatment or the like so that at least a specific resistance of 10 14 ⁇ ⁇ cm or more is obtained.
  • the liquid crystal display element of the present invention contains a polymer or copolymer in the liquid crystal composition, and the content of the polymer or copolymer is 1 mass of the total mass of the liquid crystal composition and the polymer or copolymer.
  • the liquid crystal display device has the same structure as the liquid crystal display device according to the prior art except that the content is less than 40% and less than 40% by mass.
  • the liquid crystal display device has a structure in which a liquid crystal layer is sandwiched between two transparent substrates having electrodes on at least one side.
  • the liquid crystal display element of the present invention preferably has an alignment layer for aligning the liquid crystal composition on at least one transparent substrate. By applying a voltage to the alignment layer provided on the substrate and the electrode provided on the substrate, the alignment of the liquid crystal molecules is controlled.
  • the polymer network or polymer binder has a uniaxial refractive index anisotropy or an easy axis direction, and the optical axis direction or the easy axis direction of the polymer network or the polymer binder and the easy axis direction of the low molecular liquid crystal are the same direction. Preferably there is.
  • the orientation easy axis direction of the alignment layer is the same as the orientation easy axis direction of the polymer network or the polymer binder.
  • the liquid crystal display element can be applied to operation modes such as TN, STN, ECB, VA, VA-TN, IPS, FFS, ⁇ cell, OCB, and cholesteric liquid crystal.
  • the liquid crystal display element of the present invention is a PSA (Polymer Sustained Alignment) type liquid crystal display element having a polymer or copolymer on the alignment film in that the liquid crystal composition contains a polymer or copolymer. Is different.
  • PSA Polymer Sustained Alignment
  • the distance (d) between the substrates of the liquid crystal display element of the present invention is preferably in the range of 2 to 5 ⁇ m, more preferably 3.5 ⁇ m or less.
  • the birefringence is adjusted so that the product of the birefringence of the liquid crystal composition and the cell thickness is close to 0.275.
  • a polymer network is formed after the polymerization phase separation. Therefore, the birefringence of the liquid crystal display element when an electric field is applied is lowered due to the anchoring force action of the polymer network and the optical properties of the polymer network, so that it is included in the liquid crystal composition, the polymerization composition, or the polymerizable liquid crystal composition.
  • the product of the birefringence ( ⁇ n) and the distance (d) between the substrates is particularly preferably in the range of 0.3 to 0.4 ⁇ m when the driving voltage is increased within about 5 V due to the formation of the polymer network.
  • a range of 0.30 to 0.35 ⁇ m is more preferable for an increase within a range, and a range of 0.29 to 0.33 ⁇ m is particularly preferable for an increase within a drive voltage of 1 V.
  • the birefringence of the liquid crystal composition used for the polymerizable liquid crystal composition may be set so that the product of the cell thickness (d) and the birefringence index ( ⁇ n) is 1 to 1.9 times with respect to 0.275. preferable.
  • the driving voltage of the liquid crystal display element of the present invention is not determined only by the dielectric anisotropy or elastic constant of the liquid crystal composition, but is greatly influenced by the anchoring force acting between the liquid crystal composition and the polymer interface.
  • Japanese Patent Application Laid-Open No. 6-222320 discloses the relationship of the following formula as a description relating to the driving voltage of a polymer dispersed liquid crystal display element.
  • Vth represents a threshold voltage
  • 1Kii and 2Kii represent elastic constants
  • i represents 1, 2 or 3
  • ⁇ represents dielectric anisotropy
  • ⁇ r> represents a transparent polymer substance interface.
  • A indicates the anchoring force of the transparent polymer substance to the liquid crystal composition
  • d indicates the distance between the substrates having transparent electrodes.
  • the driving voltage of the light scattering type liquid crystal display element is determined by the average gap distance at the interface of the transparent polymer substance, the distance between the substrates, the elastic constant / dielectric anisotropy of the liquid crystal composition, and Determined by the anchoring energy between the conductive polymer materials.
  • parameters that can be controlled by the liquid crystal display device of the present invention are liquid crystal properties and anchoring force between polymers. Since the anchoring force largely depends on the molecular structure of the polymer and the molecular structure of the low-molecular liquid crystal, if a polymerizable compound having a strong anchoring force is selected, the response time can be shortened to 1.5 ms or less. At the same time, since the driving voltage increases to 30 V or more, it is preferable to appropriately select the liquid crystal compound and the polymerizable compound and adjust the composition so that the driving voltage is 30 V or less and the response speed is 1.5 ms or less. .
  • the composition so that the driving voltage and the response speed are balanced by appropriately blending a polymer precursor having a strong anchoring force and a polymer precursor having a weak anchoring force.
  • the dielectric anisotropy is 6 or more for the P-type liquid crystal and ⁇ 3 or less for the N-type liquid crystal.
  • the birefringence is preferably 0.09 or more. Furthermore, it is more preferable to make the birefringence of the liquid crystal composition and the refractive index of the fibrous or columnar polymer network as close as possible to eliminate light scattering.
  • the liquid crystal display element of the present invention is irradiated with energy rays while the above-mentioned liquid crystal composition is at ⁇ 50 ° C. to 30 ° C. to polymerize the polymerizable compound and have a refractive index anisotropy or an easy orientation axis in the liquid crystal composition. It is preferably obtained by forming a polymer network having a direction.
  • the upper limit of the polymerization temperature is 30 ° C, preferably 20 ° C to -10 ° C.
  • ⁇ d is further accelerated by low temperature polymerization and normal temperature polymerization depending on the composition of the polymerizable compound. This is because 1) the polymerization is performed in a state where the orientation degree of the liquid crystal molecules is increased at a low temperature, and 2) the phase separation is facilitated by reducing the compatibility between the polymer polymerized by the low temperature polymerization and the liquid crystal composition. The phase separation speed is increased and the gap distance of the polymer network becomes fine. 3) Even if a polymerizable compound having a relatively low anchoring force is used, the influence of the anchoring force seems to be strong because the gap gap is fine.
  • the optical axis direction or the easy alignment axis direction of the polymer network or polymer binder having uniaxial refractive index anisotropy or easy alignment axis direction forms a pretilt angle with respect to the transparent substrate. It is preferable to adjust the strength of the electric field to control the orientation of the low-molecular liquid crystal, and by tilting it with respect to the substrate surface, the energy rays are applied while applying a voltage to the liquid crystal layer described above.
  • the composition is obtained by polymerizing the polymerizable compound by irradiation to obtain a polymer having a refractive index anisotropy or an orientation easy axis direction in the liquid crystal composition.
  • a voltage is applied so that the pretilt angle is within 30 ° with respect to the normal direction of the substrate, and polymerization is performed, so that the portulsion used in the current VA mode cell is used.
  • the pretilt angle with respect to the normal direction of the substrate is preferably 0.5 to 30 °, more preferably 1.0 to 20 °, still more preferably 1.2 to 10 °, and particularly preferably 1.5 to 5 °.
  • the alignment direction of the low-molecular liquid crystal is regulated by applying photo-alignment treatment or rubbing alignment treatment to the low-molecular liquid crystal to induce a pretilt angle at the substrate interface vertical alignment film interface.
  • the occurrence of orientation defects is preferably suppressed, and it is also preferable to perform the orientation treatment so as to incline in a plurality of directions.
  • the liquid crystal layer is applied with an alternating electric field in a temperature range of ⁇ 50 ° C. to 30 ° C. as appropriate to a liquid crystal composition containing a polymerizable compound, and irradiated with ultraviolet rays or an electron beam, thereby providing refractive index anisotropy. Is formed in the liquid crystal so that the optical axis direction of the polymer network forms a pretilt angle with respect to the substrate surface.
  • This pretilt angle is a liquid crystal element in which the polymer axis after polymerization is tilted with respect to the substrate surface when the polymer phase is separated in an alignment state induced by applying an electric field due to the dielectric anisotropy of the low-molecular liquid crystal It is more preferable that the polymerizable compound has a high molecular weight.
  • the two substrates used in the liquid crystal display element of the present invention can be made of a transparent material having flexibility such as glass or plastic.
  • a transparent substrate having a transparent electrode layer can be obtained, for example, by sputtering indium tin oxide (ITO) on a transparent substrate such as a glass plate.
  • ITO indium tin oxide
  • the color filter can be prepared by, for example, a pigment dispersion method, a printing method, an electrodeposition method, or a dyeing method.
  • a method for producing a color filter by a pigment dispersion method will be described as an example.
  • a curable coloring composition for a color filter is applied on the transparent substrate, subjected to patterning treatment, and cured by heating or light irradiation. By performing this process for each of the three colors red, green, and blue, a pixel portion for a color filter can be created.
  • a pixel electrode provided with an active element such as a TFT or a thin film diode may be provided on the substrate.
  • the substrate is opposed so that the transparent electrode layer is on the inside.
  • the thickness of the obtained light control layer is 1 to 100 ⁇ m. 1.5 to 10 ⁇ m is more preferable.
  • the product of the refractive index anisotropy ⁇ n of the liquid crystal and the cell thickness d is adjusted so that the contrast is maximized, and 1/550 nm is reduced depending on the display mode. It is preferable to make it 2 or 1/4.
  • the polarizing axis of each polarizing plate can be adjusted so that the viewing angle and contrast are good.
  • a retardation film for widening the viewing angle can also be used.
  • the spacer include columnar spacers made of glass particles, plastic particles, alumina particles, a photoresist material, and the like.
  • a sealant such as an epoxy thermosetting composition is screen-printed on the substrates with a liquid crystal inlet provided, the substrates are bonded together, and heated to thermally cure the sealant.
  • a normal vacuum injection method or an ODF method can be used as a method of sandwiching the polymerizable liquid crystal composition between the two substrates.
  • a sealant such as epoxy photothermal curing is drawn on a backplane or frontplane substrate using a dispenser in a closed-loop bank shape, and then removed.
  • a liquid crystal display element can be produced by bonding a front plane and a back plane after dropping a predetermined amount of the polymerizable liquid crystal composition under air.
  • the polymerizable liquid crystal composition used in the present invention can be suitably used because the liquid crystal / monomer composite material can be stably dropped in the ODF process.
  • an appropriate polymerization rate is desirable in order to obtain good alignment performance of liquid crystals. Therefore, ultraviolet rays or electron beams, which are active energy rays, are irradiated singly or in combination or sequentially.
  • the method of polymerizing by is preferred.
  • a polarized light source or a non-polarized light source may be used.
  • polymerization is performed in a state where the polymerizable liquid crystal composition is sandwiched between two substrates, at least the substrate on the irradiation surface side must be given appropriate transparency to the active energy rays. .
  • the liquid crystal composition containing a polymerizable compound it is preferable to apply an alternating electric field to the polymerizable liquid crystal composition in a temperature range of ⁇ 50 ° C. to 20 ° C. and irradiate ultraviolet rays or electron beams.
  • the alternating electric field to be applied is preferably an alternating current having a frequency of 10 Hz to 10 kHz, more preferably a frequency of 100 Hz to 5 kHz, and the voltage is selected depending on a desired pretilt angle of the liquid crystal display element. That is, the pretilt angle of the liquid crystal display element can be controlled by the applied voltage.
  • the pretilt angle is preferably controlled from 80 degrees to 89.9 degrees from the viewpoint of alignment stability and contrast.
  • the temperature during irradiation is preferably in the temperature range of ⁇ 50 ° C. to 30 ° C. for the polymerizable liquid crystal composition.
  • a lamp for generating ultraviolet rays a metal halide lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like can be used.
  • a wavelength of the ultraviolet rays to be irradiated it is preferable to irradiate ultraviolet rays in a wavelength region other than the absorption wavelength region of the liquid crystal composition, and it is preferable to cut and use ultraviolet rays of less than 365 nm as necessary.
  • Intensity of ultraviolet irradiation is preferably from 0.1mW / cm 2 ⁇ 100W / cm 2, 2mW / cm 2 ⁇ 50W / cm 2 is more preferable.
  • the amount of energy of ultraviolet rays to be irradiated can be adjusted as appropriate, but is preferably 10 mJ / cm 2 to 500 J / cm 2, and more preferably 100 mJ / cm 2 to 200 J / cm 2 .
  • the intensity may be changed.
  • the time for irradiating with ultraviolet rays is appropriately selected depending on the intensity of the irradiated ultraviolet rays, but is preferably from 10 seconds to 3600 seconds, and more preferably from 10 seconds to 600 seconds.
  • FIG. 1 is a schematic sectional view showing an example of the liquid crystal display element of the present invention.
  • a liquid crystal display element 10 according to an embodiment of the present invention includes a first substrate 2 having an alignment layer 4 formed on the surface thereof, a space away from the first substrate, and a photo-alignment layer formed on the surface. And a liquid crystal layer 5 filled between the first substrate 2 and the second substrate 7 and in contact with the pair of alignment layers, the alignment layer 4 (4a, 4b). ) And the first substrate 2 have an electrode layer 3 including a thin film transistor, a common electrode 22 and a pixel electrode as an active element.
  • FIG. 1 is a diagram schematically showing a configuration of a liquid crystal display element.
  • the configuration of the liquid crystal display element 10 according to the embodiment of the present invention is sandwiched between a first transparent insulating substrate 2 and a second transparent insulating substrate 7 that are arranged to face each other.
  • a liquid crystal display element of a lateral electric field type (an FFS mode as one form of IPS as an example in the figure) having the polymerizable liquid crystal composition (or liquid crystal layer 5).
  • the first transparent insulating substrate 2 has an electrode layer 3 formed on the surface on the liquid crystal layer 5 side.
  • the liquid crystal molecules in the polymerizable liquid crystal composition are aligned so as to be substantially parallel to the substrates 2 and 7 when no voltage is applied.
  • the second substrate 7 and the first substrate 2 may be sandwiched between a pair of polarizing plates 1 and 8.
  • a color filter 6 is provided between the second substrate 7 and the alignment film 4.
  • the liquid crystal display element according to the present invention may be a so-called color filter on array (COA), or a color filter may be provided between an electrode layer including a thin film transistor and a liquid crystal layer, or the thin film transistor.
  • COA color filter on array
  • a color filter may be provided between the electrode layer containing and the second substrate.
  • the liquid crystal display element 10 of one embodiment of the present invention includes the first polarizing plate 1, the first substrate 2, the electrode layer 3 including a thin film transistor, the alignment film 4, and the polymerizable liquid crystal composition.
  • the liquid crystal layer 5, the alignment film 4, the color filter 6, the second substrate 7, and the second polarizing plate 8 are sequentially stacked.
  • the first substrate 2 and the second substrate 7 can be made of a transparent material having flexibility such as glass or plastic, and one of them can be an opaque material such as silicon.
  • the two substrates 2 and 7 are bonded together by a sealing material and a sealing material such as an epoxy thermosetting composition disposed in the peripheral region, and in order to maintain the distance between the substrates, for example, Spacer columns made of resin formed by granular spacers such as glass particles, plastic particles, alumina particles, or the photolithography method may be arranged.
  • FIG. 2 is an enlarged plan view of a region surrounded by the II line of the electrode layer 3 formed on the substrate 2 in FIG.
  • FIG. 3 is a cross-sectional view of the liquid crystal display element shown in FIG. 1 cut along the line III-III in FIG.
  • the electrode layer 3 including a thin film transistor formed on the surface of the first substrate 2 includes a plurality of gate lines 24 for supplying scanning signals and a plurality of data for supplying display signals.
  • the wirings 25 are arranged in a matrix so as to cross each other. In FIG. 2, only a pair of gate lines 24 and a pair of data lines 25 are shown.
  • a unit pixel of a liquid crystal display device is formed by a region surrounded by a plurality of gate lines 24 and a plurality of data lines 25, and a pixel electrode 21 and a common electrode 22 are formed in the unit pixel.
  • a thin film transistor including a source electrode 27, a drain electrode 26, and a gate electrode 28 is provided in the vicinity of the intersection where the gate wiring 24 and the data wiring 25 intersect each other.
  • the thin film transistor is connected to the pixel electrode 21 as a switch element that supplies a display signal to the pixel electrode 21.
  • a common line (not shown) is provided in parallel with the gate wiring 24. The common line is connected to the common electrode 22 in order to supply a common signal to the common electrode 22.
  • a preferred embodiment of the structure of the thin film transistor is provided, for example, as shown in FIG. 3 so as to cover the gate electrode 11 formed on the surface of the substrate 2 and the gate electrode 11 and cover the substantially entire surface of the substrate 2.
  • a source electrode 17 which covers the other side edge of the layer 14 and the semiconductor layer 13 and is in contact with the gate insulating layer 12 formed on the surface of the substrate 2; and the drain Has an insulating protective layer 18 provided to cover the electrode 16 and the source electrode 17, a.
  • An anodic oxide film may be formed on the surface of the gate electrode 11 for reasons such as eliminating a step with the gate electrode.
  • Amorphous silicon, polycrystalline polysilicon, or the like can be used for the semiconductor layer 13, but when a transparent semiconductor film such as ZnO, IGZO (In—Ga—Zn—O), ITO, or the like is used, it results from light absorption. It is also preferable from the viewpoint of suppressing the adverse effect of optical carriers and increasing the aperture ratio of the element.
  • an ohmic contact layer 15 may be provided between the semiconductor layer 13 and the drain electrode 16 or the source electrode 17 for the purpose of reducing the width and height of the Schottky barrier.
  • a material in which an impurity such as phosphorus such as n-type amorphous silicon or n-type polycrystalline polysilicon is added at a high concentration can be used.
  • the gate wiring 26, the data wiring 25, and the common line 29 are preferably metal films, more preferably Al, Cu, Au, Ag, Cr, Ta, Ti, Mo, W, Ni, or an alloy thereof, and Al or an alloy thereof. It is particularly preferable to use this wiring.
  • the insulating protective layer 18 is a layer having an insulating function, and is formed of silicon nitride, silicon dioxide, silicon oxynitride film, or the like.
  • the common electrode 22 is a flat electrode formed on almost the entire surface of the gate insulating layer 12, while the pixel electrode 21 is an insulating protective layer 18 covering the common electrode 22. It is a comb-shaped electrode formed on the top. That is, the common electrode 22 is disposed at a position closer to the first substrate 2 than the pixel electrode 21, and these electrodes are disposed so as to overlap each other via the insulating protective layer 18.
  • the pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IZTO (Indium Zinc Tin Oxide), and the like. Since the pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material, the area opened by the unit pixel area increases, and the aperture ratio and transmittance increase.
  • the pixel electrode 21 and the common electrode 22 have an interelectrode distance (also referred to as a minimum separation distance): R between the pixel electrode 21 and the common electrode 22 in order to form a fringe electric field between the electrodes.
  • the distance between the first substrate 2 and the second substrate 7 is smaller than G.
  • the distance between electrodes: R represents the distance in the horizontal direction on the substrate between the electrodes.
  • the distance between the first substrate 7 and the second substrate 7 is smaller than G, so that a fringe electric field E is formed. Therefore, the FFS type liquid crystal display element can use a horizontal electric field formed in a direction perpendicular to a line forming the comb shape of the pixel electrode 21 and a parabolic electric field.
  • the electrode width of the comb-shaped portion of the pixel electrode 21: l and the width of the gap of the comb-shaped portion of the pixel electrode 21: m are such that all the liquid crystal molecules in the liquid crystal layer 5 can be driven by the generated electric field. It is preferable to form. Further, the minimum separation distance R between the pixel electrode and the common electrode can be adjusted as the (average) film thickness of the gate insulating layer 12.
  • an inter-electrode distance (also referred to as a minimum separation distance) between the pixel electrode 21 and the common electrode 22: R is different from that of the first substrate 2 and the second substrate.
  • the distance from the substrate 7 may be larger than G (IPS method).
  • IPS method a configuration in which comb-like pixel electrodes and comb-like common electrodes are provided alternately in substantially the same plane can be cited.
  • a preferred form of the liquid crystal display element according to the present invention is preferably an FFS mode liquid crystal display element using a fringe electric field, and the shortest separation distance d between the common electrode 22 and the pixel electrode 21 is set to be the alignment film 4.
  • the distance is shorter than the shortest distance D between the substrates (distance between substrates)
  • a fringe electric field is formed between the common electrode and the pixel electrode, and the horizontal and vertical alignments of the liquid crystal molecules can be used efficiently.
  • the FFS mode liquid crystal display element of the present invention when a voltage is applied to the liquid crystal molecules arranged so that the long axis direction is parallel to the alignment direction of the alignment layer, the pixel electrode 21 and the common electrode 22 are interposed.
  • Parabolic electric field equipotential lines are formed up to the top of the pixel electrode 21 and the common electrode 22 and are arranged along the electric field in which the long axes of the liquid crystal molecules in the liquid crystal layer 5 are formed. Therefore, liquid crystal molecules can be driven even with a low dielectric anisotropy.
  • the color filter 6 it is preferable to form a black matrix (not shown) in a portion corresponding to the thin film transistor and the storage capacitor 23 from the viewpoint of preventing light leakage.
  • the color filter 6 is usually composed of one dot of video or image from three filter pixels of R (red), G (green), and B (blue). For example, these three filters are arranged in the extending direction of the gate wiring. Yes.
  • the color filter 6 can be produced by, for example, a pigment dispersion method, a printing method, an electrodeposition method, or a dyeing method. A method for producing a color filter by a pigment dispersion method will be described as an example.
  • a curable coloring composition for a color filter is applied onto the transparent substrate, subjected to patterning treatment, and cured by heating or light irradiation. By performing this process for each of the three colors red, green, and blue, a pixel portion for a color filter can be manufactured.
  • a so-called color filter-on-array in which pixel electrodes provided with active elements such as TFTs and thin film diodes are provided on the substrate may be used.
  • a pair of alignment films 4 that are in direct contact with the polymerizable liquid crystal composition constituting the liquid crystal layer 5 and induce homogeneous alignment are provided.
  • the polarizing plate 1 and the polarizing plate 8 can be adjusted so that the viewing angle and the contrast are good by adjusting the polarizing axis of each polarizing plate, and the transmission axes thereof operate in the normally black mode.
  • any one of the polarizing plate 1 and the polarizing plate 8 is preferably arranged so as to have a transmission axis parallel to the alignment direction of the liquid crystal molecules.
  • a retardation film for widening the viewing angle can also be used.
  • the shortest separation distance d between the adjacent common electrode and the pixel electrode is longer than the shortest separation distance G between the liquid crystal alignment films.
  • the electrode and the pixel electrode are formed on the same substrate, and the common electrode and the pixel electrode are alternately arranged, and the shortest separation distance d between the adjacent common electrode and the pixel electrode is the liquid crystal alignment Examples include a structure longer than the shortest separation distance G between the films.
  • the pair of substrates are separated and faced so that the film is inside, and then the liquid crystal It is preferred to fill the composition between the substrates. In that case, it is preferable to adjust the space
  • the distance between the substrates (the average thickness of the obtained liquid crystal layer, also referred to as the separation distance between the coatings) is preferably adjusted to be 1 to 100 ⁇ m.
  • the average distance between the coatings is more preferably 1.5 to 10 ⁇ m.
  • examples of the spacer used for adjusting the distance between the substrates include columnar spacers made of glass particles, plastic particles, alumina particles, a photoresist material, and the like.
  • the FFS type liquid crystal display element described with reference to FIGS. 1 to 3 is an example, and can be implemented in various other forms without departing from the technical idea of the present invention.
  • FIG. 4 is another embodiment of the plan view in which the region surrounded by the II line of the electrode layer 3 formed on the substrate 2 in FIG. 1 is enlarged.
  • the pixel electrode 21 may have a slit.
  • the slit pattern may be formed so as to have an inclination angle with respect to the gate wiring 24 or the data wiring 25.
  • the pixel electrode 21 shown in FIG. 4 has a shape in which a substantially rectangular flat plate electrode is cut out by a notch portion having a substantially rectangular frame shape. Further, a comb-like common electrode 22 is formed on one surface of the back surface of the pixel electrode 21 via an insulating protective layer 18 (not shown). When the shortest separation distance R between the adjacent common electrode and the pixel electrode is shorter than the shortest separation distance G between the alignment layers, the FFS method is used.
  • the surface of the pixel electrode is preferably covered with a protective insulating film and an alignment film layer.
  • a storage capacitor 23 for storing a display signal supplied via the data line 25 may be provided in an area surrounded by the plurality of gate lines 24 and the plurality of data lines 25.
  • the shape of the notch is not particularly limited, and is not limited to the substantially rectangular shape shown in FIG. 4, and a notch having a known shape such as an ellipse, a circle, a rectangle, a rhombus, a triangle, or a parallelogram. Can be used.
  • a notch having a known shape such as an ellipse, a circle, a rectangle, a rhombus, a triangle, or a parallelogram.
  • FIG. 5 is another embodiment different from FIG. 3, and is another example of a cross-sectional view of the liquid crystal display element shown in FIG. 1 taken along the line III-III in FIG.
  • the liquid crystal layer 5 containing the liquid crystal composition is filled in this space.
  • a gate insulating layer 12, a common electrode 22, an insulating protective layer 18, a pixel electrode 21, and an alignment layer 4 are stacked in this order on part of the surface of the first substrate 2. As shown in FIG.
  • the pixel electrode 21 has a shape in which the center and both ends of the flat plate are cut out by a triangular cutout, and the remaining region is cut out by a rectangular cutout.
  • the common electrode 22 has a structure in which a comb-like common electrode is disposed on the first substrate side from the pixel electrode substantially in parallel with the substantially elliptical cutout portion of the pixel electrode 21.
  • FIG. 5 shows an example in which the common electrode 22 is formed on the gate insulating layer 12, but as shown in FIG. 5, the common electrode 22 is formed on the first substrate 2,
  • the pixel electrode 21 may be provided through the gate insulating layer 12.
  • the electrode width of the pixel electrode 21: l, the electrode width of the common electrode 22: n, and the interelectrode distance: R are appropriately adjusted to such a width that all liquid crystal molecules in the liquid crystal layer 5 can be driven by the generated electric field. It is preferable.
  • the shortest separation distance R between the adjacent common electrode and the pixel electrode is shorter than the shortest separation distance G between the alignment layers, the FFS method is used, and when it is longer, the IPS method is used.
  • the positions in the thickness direction of the pixel electrode 21 and the common electrode 22 are different, but the positions in the thickness direction of both electrodes may be the same or the common electrode may be provided on the liquid crystal layer 5 side.
  • FIG. 6 is a diagram schematically showing a configuration of a vertical electric field type liquid crystal display element. Moreover, in FIG. 7, for convenience of explanation, each component is illustrated separately.
  • FIG. 7 is an enlarged plan view of a region surrounded by a line VII of an electrode layer 300 including a thin film transistor (or also referred to as a thin film transistor layer 300) formed on the substrate in FIG.
  • FIG. 8 is a cross-sectional view of the liquid crystal display element shown in FIG. 6 taken along the line VIII-VIII in FIG.
  • the liquid crystal display element 1000 includes a second substrate 800 provided with a transparent electrode (layer) 600 (also referred to as a common electrode 600) made of a transparent conductive material, as shown in FIG.
  • a transparent electrode (layer) 600 also referred to as a common electrode 600
  • the polymerizable liquid crystal composition (or the liquid crystal layer 500) is sandwiched between the liquid crystal molecules in the polymerizable liquid crystal composition, and the alignment when no voltage is applied is substantially perpendicular to the substrates 200 and 800.
  • the second substrate 800 and the first substrate 200 may be sandwiched between a pair of polarizing plates 100 and 900.
  • a color filter 700 is provided between the first substrate 200 and the common electrode 600.
  • a pair of alignment films 400 are formed on the surfaces of the transparent electrodes (layers) 600 and 1400 so as to be adjacent to the liquid crystal layer 500 according to the present invention and in direct contact with the polymerizable liquid crystal composition constituting the liquid crystal layer 500.
  • the liquid crystal display element 1000 according to the present invention includes a first polarizing plate 100, a first substrate 200, an electrode layer (also referred to as a thin film transistor layer) 300 including a thin film transistor, a photo-alignment film 400, and a liquid crystal composition.
  • a layer 500 containing an object, an alignment film 400, a common electrode 600, a color filter 700, a second substrate 800, and a second polarizing plate 900 are sequentially stacked.
  • the alignment film 400 is preferably a photo-alignment film.
  • FIG. 10 is a schematic cross-sectional view showing an embodiment of the VA mode liquid crystal display device according to the present invention, in which an alignment film is formed in a liquid crystal layer of a liquid crystal cell manufactured using alignment treatment (mask rubbing or photo-alignment).
  • 3 shows a polymer network structure and a liquid crystal molecular arrangement structure.
  • a vertical alignment film slightly inclined (0.1 to 5.0 °) from the normal direction of the glass substrate is formed on the inner side (liquid crystal layer side) of the transparent electrode of the liquid crystal cell.
  • the molecule has a twisted structure of approximately 90 ° between the upper and lower substrates.
  • the polymerizable monomers are arranged in the vertical direction, and the polymerizable monomer is polymerized and fixed by UV light irradiation to form a polymer network.
  • the polymer network formed in this way is (V1) a polymer network that extends over the upper and lower substrates, (V2) a polymer network that forms the polymer network from the upper (lower) substrate toward the liquid crystal direction, but halfway ( V3) A polymer network is formed only near the surface of the alignment film. (Mainly in the case of a monofunctional monomer), (V4) It is estimated that the polymer network has approximately four types of structures in which the polymer networks are bonded (not floating).
  • the polymer polymer network having anisotropy formed in this manner is almost completely separated from the liquid crystal layer, and the liquid crystal molecules are considered to be aligned between these polymer networks.
  • the molecular alignment structure of the so-called polymer network type liquid crystal, in which liquid crystal molecules and polymer networks coexist and cause light scattering when no voltage is applied, is clearly different from that of the alignment maintaining layer that is unevenly distributed in the vicinity of the alignment film used in PSA etc. It has a completely different structure.
  • a polymer network and a liquid crystal molecular alignment structure by a method using an alignment film have been shown, but even in a so-called MVA method having a structure such as a rib or a slit, a pretilt of a polymer network or liquid crystal molecules in the vicinity of the substrate interface is It is only slightly different depending on the intensity of the oblique electric field applied through the structure or the slit, and it is presumed that it has a structure as shown in the upper diagram.
  • the anchoring force for the liquid crystal molecules when no voltage is applied is due to the synergistic action of the anchoring force of the liquid crystal alignment film and the polymer network.
  • the response speed when the voltage is OFF can be increased.
  • FIG. 11 is a plan view schematically showing a minimum unit structure in one pixel PX of a TFT liquid crystal display element using the above technique.
  • the structure and operation of the horizontal / diagonal electric field mode liquid crystal display device will be briefly described below.
  • the pixel electrode PE has a main pixel electrode PA and a sub-pixel electrode PB.
  • the main pixel electrode PA and the sub-pixel electrode PB are electrically connected to each other, and both the main pixel electrode PA and the sub-pixel electrode PB are provided on the array substrate AR.
  • the main pixel electrode PA extends along the second direction Y, and the subpixel electrode PB extends along the first direction X different from the second direction Y.
  • the pixel electrode PE is formed in a substantially cross shape.
  • the sub-pixel electrode PB is coupled to a substantially central portion of the main pixel electrode PA, and extends from the main pixel electrode PA toward both sides thereof, that is, the left side and the right side of the pixel PX.
  • the main pixel electrode PA and the sub pixel electrode PB are substantially orthogonal to each other.
  • the pixel electrode PE is electrically connected to a switching element (not shown) in the pixel electrode PB.
  • the common electrode CE has a main common electrode CA and a sub-common electrode CB, and the main common electrode CA and the sub-common electrode CB are electrically connected to each other.
  • the common electrode CE is electrically insulated from the pixel electrode PE.
  • at least a part of the main common electrode CA and the sub-common electrode CB is provided on the counter substrate CT.
  • the main common electrode CA extends along the second direction Y.
  • the main common electrode CA is disposed on both sides of the main pixel electrode PA. At this time, none of the main common electrodes CA overlaps with the main pixel electrode PA in the XY plane, and a substantially equal interval is formed between each of the main common electrodes CA and the main pixel electrode PA. Yes.
  • the main pixel electrode PA is located approximately in the middle of the adjacent main common electrode CA.
  • the sub-common electrode CB extends along the first direction X.
  • the sub-common electrode CB is disposed on both sides of the sub-pixel electrode PB.
  • none of the sub-common electrodes CB overlaps the sub-pixel electrode PB in the XY plane, and a substantially equal interval is formed between each of the sub-common electrodes CB and the sub-pixel electrode PB.
  • the sub-pixel electrode PB is located approximately in the middle of the adjacent sub-common electrode CB.
  • the main common electrode CA is formed in a strip shape extending linearly along the second direction Y.
  • the sub-common electrode CB is formed in a strip shape extending linearly along the first direction X.
  • the two main common electrodes CA are arranged in parallel at intervals along the first direction X.
  • the main common electrode on the left side in the drawing is referred to as CAL.
  • the right main common electrode is called CAR.
  • the two sub-common electrodes CB are arranged in parallel along the second direction Y at intervals, and in the following, in order to distinguish these, the upper main common electrode in the drawing is referred to as CBU.
  • the lower main common electrode is called CBB.
  • the main common electrode CAL and the main common electrode CAR are at the same potential as the sub-common electrode CBU and the sub-common electrode CBB.
  • the main common electrode CAL and the main common electrode CAR are connected to the sub-common electrode CBU and the sub-common electrode CBB, respectively.
  • the main common electrode CAL and the main common electrode CAR are respectively disposed between the pixel PX and the adjacent pixels on the left and right. That is, the main common electrode CAL is disposed across the boundary between the illustrated pixel PX and the left pixel (not shown), and the main common electrode CAR is the illustrated pixel PX and the right pixel (not shown). ).
  • the sub-common electrode CBU and the main common electrode CBB are disposed between pixels adjacent to the pixel PX in the vertical direction. That is, the sub-common electrode CBU is disposed across the boundary between the illustrated pixel PX and the upper pixel (not illustrated), and the sub-common electrode CBB is illustrated with the illustrated pixel PX and the lower pixel (not illustrated). Z)).
  • the initial alignment direction of the liquid crystal molecules LM is a direction substantially parallel to the second direction Y.
  • the first alignment film AL1 is disposed on the surface of the array substrate AR that faces the counter substrate CT, and extends over substantially the entire active area ACT.
  • the first alignment film AL1 covers the pixel electrode PE and is also disposed on the second interlayer insulating film 13. Such a first alignment film AL1 is formed of a material exhibiting horizontal alignment.
  • the array substrate AR may further include a first main common electrode and a first sub-common electrode as part of the common electrode.
  • FIG. 12 is a schematic diagram of an electrode structure of an eight-division oblique electric field mode liquid crystal cell. In this way, a wider viewing angle can be realized by dividing one pixel into eight.
  • the operation of the liquid crystal display panel having the above configuration will be described.
  • the liquid crystal molecules LM of LQ are aligned such that the major axis thereof faces the first alignment processing direction PD1 of the first alignment film AL1 and the second alignment processing direction PD2 of the second alignment film AL2.
  • Such OFF time corresponds to the initial alignment state
  • the alignment direction of the liquid crystal molecules LM at the OFF time corresponds to the initial alignment direction.
  • the liquid crystal molecules LM are not always aligned parallel to the XY plane, and are often pretilted. Therefore, the strict initial alignment direction of the liquid crystal molecules LM is a direction obtained by orthogonally projecting the alignment direction of the liquid crystal molecules LM at the OFF time on the XY plane.
  • the first alignment treatment direction PD1 and the second alignment treatment direction PD2 are both substantially parallel to the second direction Y.
  • the liquid crystal molecules LM are initially aligned so that the major axis thereof is oriented in a direction substantially parallel to the second direction Y, as indicated by a broken line in FIG. That is, the initial alignment direction of the liquid crystal molecules LM is parallel to the second direction Y (or 0 ° with respect to the second direction Y).
  • the liquid crystal molecules LM in the cross section of the liquid crystal layer LQ are substantially horizontal in the vicinity of the intermediate portion of the liquid crystal layer LQ. Alignment is performed with a pretilt angle of approximately zero, and alignment is performed with a pretilt angle that is symmetrical in the vicinity of the first alignment film AL1 and the vicinity of the second alignment film AL2 (spray alignment).
  • the liquid crystal molecules LM in the vicinity of the first alignment film AL1 and the second alignment film in the direction inclined from the normal direction of the substrate are the liquid crystal molecules LM in the vicinity of AL2.
  • the liquid crystal molecules LM are in the vicinity of the first alignment film AL1, in the second alignment film AL2 in the cross section of the liquid crystal layer LQ. And in the middle part of the liquid crystal layer LQ with a substantially uniform pretilt angle (homogeneous alignment). Part of the backlight light from the backlight 4 passes through the first polarizing plate PL1 and enters the liquid crystal display panel LPN.
  • the light incident on the liquid crystal display panel LPN is linearly polarized light orthogonal to the first polarization axis AX1 of the first polarizing plate PL1.
  • Such a polarization state of linearly polarized light hardly changes when it passes through the liquid crystal display panel LPN in the OFF state. Therefore, the linearly polarized light transmitted through the liquid crystal display panel LPN is absorbed by the second polarizing plate PL2 having a crossed Nicol positional relationship with the first polarizing plate PL1 (black display).
  • the substrate is interposed between the pixel electrode PE and the common electrode CE.
  • a horizontal electric field (or an oblique electric field) substantially parallel to the line is formed.
  • the liquid crystal molecules LM are affected by the electric field and rotate in a plane whose major axis is substantially parallel to the XY plane as indicated by the solid line in the figure.
  • the liquid crystal molecules LM in the lower half of the region between the pixel electrode PE and the main common electrode CAL rotate clockwise with respect to the second direction Y in the drawing.
  • the liquid crystal molecules LM in the upper half region rotate counterclockwise with respect to the second direction Y and are oriented so as to face the upper left in the figure.
  • the liquid crystal molecules LM in the lower half region rotate counterclockwise with respect to the second direction Y and face the lower right in the drawing.
  • the liquid crystal molecules LM in the upper half region are aligned so as to rotate clockwise with respect to the second direction Y and to face the upper right in the drawing.
  • each pixel PX in the state where an electric field is formed between the pixel electrode PE and the common electrode CE, the alignment direction of the liquid crystal molecules LM is divided into a plurality of directions with the position overlapping the pixel electrode PE as a boundary. , A domain is formed in each orientation direction. That is, a plurality of domains are formed in one pixel PX.
  • linearly polarized light orthogonal to the first polarization axis AX1 of the first polarizing plate PL1 is incident on the liquid crystal display panel LPN, and the polarization state is the alignment of the liquid crystal molecules LM when passing through the liquid crystal layer LQ. It changes according to the state.
  • the second polarizing plate PL2 (white display). According to such a structure, since four domains can be formed in one pixel, viewing angles in the four directions can be optically compensated, and a wide viewing angle can be achieved.
  • liquid crystal display device with high display quality, which can realize display with high transmittance without gradation inversion. Further, by setting the area of the opening portion to be substantially the same for each of the four regions partitioned by the pixel electrode PE and the common electrode CE within one pixel, the transmittance of each region becomes substantially equal, The light transmitted through the part optically compensates for each other, and a uniform display can be realized over a wide viewing angle range.
  • Example 1 A polymerizable composition was prepared by mixing 2.00% of a polymerizable compound (V-2) and 1.00% of a liquid crystal compound (RV-1) having a function of generating radicals by light. Liquid crystal composition (LCN-1) ( ⁇ n: 0.101, ⁇ : -3.2) 97% and 3% of the polymerizable composition were mixed and dissolved by heating at 60 ° C. The composition used in Example 1 Product 1 was obtained.
  • Compositions 2 to 5 used in Examples 2 to 5 were obtained in the same manner except that a liquid crystal composition, a polymerizable compound, and a liquid crystal compound having a function of generating radicals by light were used as described in the following table. . Since (RV-2) and (RV-3) have a polymerizable group, they function as a liquid crystal compound having a function of generating radicals by light and also as a polymerizable compound.
  • compositions 1 to 5 were confirmed with a polarizing microscope that the polymerizable compound (V-2) was uniformly dissolved at room temperature to show a nematic liquid crystal phase. Compositions 1 to 5 were heated to 60 ° C. and injected into the glass cell by vacuum injection.
  • the glass cell was taken out and the inlet was sealed with a sealing agent 3026E (manufactured by ThreeBond). Irradiation intensity of 100 mW / cm 2 through an ultraviolet cut filter L-37 (manufactured by Hoya Candeo Optronics) was irradiated at 25 ° C. for 120 seconds. Thereafter, 50 mW / cm 2 ultraviolet rays were irradiated at 25 ° C. for 7200 seconds. Thus, the polymerizable composition in the composition was polymerized to obtain VA mode liquid crystal display elements of Examples 1 to 5.
  • the obtained liquid crystal display element When the obtained liquid crystal display element is placed between two orthogonal polarizing plates, it becomes black and the dark field does not change even if the cell is rotated in the azimuth direction, the optical axis direction of the polymer network and the easy axis of alignment of the liquid crystal composition The direction was confirmed to be the same direction. Moreover, it was confirmed from the retardation measurement that the liquid crystal composition was aligned in a state where the pretilt angle was 2 ° with respect to the normal direction of the substrate. Response time was measured by applying a rectangular wave of 60 Hz. The fall time ⁇ d was measured by applying a rectangular wave voltage of 60 Hz giving V90.
  • Display unevenness evaluation was performed by placing the liquid crystal display element obtained between two orthogonal polarizing plates and visually confirming the backlight as a light source according to the following criteria.
  • Example 6 Comparative Example 1
  • Example 6 and Comparative Example 1 were the same as Example 1 except that the liquid crystal composition, the polymerizable compound, the liquid crystalline compound having the function of generating radicals by light, and the initiator were used as described in the following table.
  • a VA mode liquid crystal display element was obtained.
  • the obtained liquid crystal display element When the obtained liquid crystal display element is placed between two orthogonal polarizing plates, it becomes black and the dark field does not change even if the cell is rotated in the azimuth direction, the optical axis direction of the polymer network and the easy axis of alignment of the liquid crystal composition The direction was confirmed to be the same direction. Moreover, it was confirmed from the retardation measurement that the liquid crystal composition was aligned in a state where the pretilt angle was 2 ° with respect to the normal direction of the substrate.
  • the obtained liquid crystal display element was subjected to response time measurement and display unevenness evaluation in the same manner as in Example 1. The evaluation results are shown below.
  • Example 7 A VA mode liquid crystal display device of Example 7 was prepared in the same manner as in Example 1 except that a liquid crystal composition, a polymerizable compound, and a liquid crystal compound having a function of generating radicals by light were used as described in the following table. Obtained.
  • the obtained liquid crystal display element When the obtained liquid crystal display element is placed between two orthogonal polarizing plates, it becomes black and the dark field does not change even if the cell is rotated in the azimuth direction, the optical axis direction of the polymer network and the easy axis of alignment of the liquid crystal composition The direction was confirmed to be the same direction. Moreover, it was confirmed from the retardation measurement that the liquid crystal composition was aligned in a state where the pretilt angle was 2 ° with respect to the normal direction of the substrate.
  • the obtained liquid crystal display element was subjected to response time measurement and display unevenness evaluation in the same manner as in Example 1. The evaluation results are shown below.
  • Example 7 can realize a high-speed response by suppressing the fall time, and can suppress the occurrence of display unevenness.
  • Examples 8 to 9, Comparative Example 2 Examples 8 and 9 and Comparative Example were the same as Example 1 except that the liquid crystal composition, the polymerizable compound, the liquid crystalline compound having the function of generating radicals by light and the initiator were used as described in the following table. 2 VA mode liquid crystal display elements were obtained.
  • the obtained liquid crystal display element When the obtained liquid crystal display element is placed between two orthogonal polarizing plates, it becomes black and the dark field does not change even if the cell is rotated in the azimuth direction, the optical axis direction of the polymer network and the easy axis of alignment of the liquid crystal composition The direction was confirmed to be the same direction. Moreover, it was confirmed from the retardation measurement that the liquid crystal composition was aligned in a state where the pretilt angle was 2 ° with respect to the normal direction of the substrate.
  • the obtained liquid crystal display element was subjected to response time measurement and display unevenness evaluation in the same manner as in Example 1. The evaluation results are shown below.
  • Example 10 to 13 In the same manner as in Example 1 except that a liquid crystal composition, a polymerizable compound, a liquid crystal compound having a function of generating radicals by light and an initiator were used as described in the following table, the VA mode of Examples 10 to 13 A liquid crystal display element was obtained.
  • the obtained liquid crystal display element When the obtained liquid crystal display element is placed between two orthogonal polarizing plates, it becomes black and the dark field does not change even if the cell is rotated in the azimuth direction, the optical axis direction of the polymer network and the easy axis of alignment of the liquid crystal composition The direction was confirmed to be the same direction. Moreover, it was confirmed from the retardation measurement that the liquid crystal composition was aligned in a state where the pretilt angle was 2 ° with respect to the normal direction of the substrate. About the obtained liquid crystal display element, it carried out similarly to Example 1, and measured the response time and performed display nonuniformity evaluation. The evaluation results are shown below.
  • a VA mode liquid crystal display device was obtained in the same manner as in Example 1 except that an ultraviolet ray having an irradiation intensity of 20 mW / cm 2 was irradiated for 60 seconds at 25 ° C. while applying a rectangular wave of 100 Hz as shown in the following table. It was.
  • the obtained liquid crystal display element is placed between two orthogonal polarizing plates, it becomes black and the dark field does not change even if the cell is rotated in the azimuth direction, the optical axis direction of the polymer network and the easy axis of alignment of the liquid crystal composition The direction was confirmed to be the same direction.
  • Example 14 it was confirmed that the liquid crystal composition was aligned in a state where the pretilt angle with respect to the normal direction of the substrate was 2 ° in Example 14 and 3 ° in Example 15.
  • the obtained liquid crystal display element it carried out similarly to Example 1, and measured the response time. Further, the transmittance was measured by applying a rectangular wave of 60 Hz. The evaluation results are shown below.
  • Example 16 to 17 Comparative Example 3
  • Example 16 to 17 and Comparative Example 3 were the same as Example 1 except that the liquid crystal composition, the polymerizable compound, the liquid crystalline compound having a function of generating radicals by light and the initiator were used as described in the following table.
  • a VA mode liquid crystal display element was obtained.
  • the obtained liquid crystal display element When the obtained liquid crystal display element is placed between two orthogonal polarizing plates, it becomes black and the dark field does not change even if the cell is rotated in the azimuth direction, the optical axis direction of the polymer network and the easy axis of alignment of the liquid crystal composition The direction was confirmed to be the same direction. Moreover, it was confirmed from the retardation measurement that the liquid crystal composition was aligned in a state where the pretilt angle was 2 ° with respect to the normal direction of the substrate. About the obtained liquid crystal display element, it carried out similarly to Example 1, and measured the response time and performed display nonuniformity evaluation. The evaluation results are shown below.
  • the liquid crystal display elements of Examples 16 and 17 can realize a high-speed response by suppressing the fall time, and can suppress the occurrence of display unevenness.
  • the liquid crystal display element of Comparative Example 3 not only did the fall time be long and the high-speed response was observed, but also display unevenness was observed.

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Abstract

La présente invention concerne un élément d'affichage à cristaux liquides exceptionnel pour lequel le temps de chute d'un cristal liquide est amélioré, ce qui permet d'obtenir une réponse exceptionnelle à vitesse élevée et de réduire à un minimum l'incidence des irrégularités d'affichage provoquées par une concentration en initiateur non uniforme. La présente invention concerne un élément d'affichage à cristaux liquides selon lequel une composition de cristaux liquides qui contient un ou plusieurs composés de cristaux liquides maintenus entre deux substrats transparents, dont au moins l'un d'eux comporte une électrode, contient un polymère ou un copolymère qui est une composition polymérisable durcie contenant un ou plusieurs composés polymérisables et un composé à cristaux liquides qui a pour fonction de générer des radicaux par le biais d'une lumière ou d'une chaleur; le contenu de la composition polymérisable par rapport au poids total de la composition polymérisable et de la composition de cristaux liquides faisant au moins 1 % en masse mais moins de 40 % en masse.
PCT/JP2016/073422 2015-08-11 2016-08-09 Élément d'affichage à cristaux liquides WO2017026478A1 (fr)

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