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WO2019009222A1 - Composition de cristaux liquides, dispositif d'affichage à cristaux liquides et procédé de production de dispositif d'affichage à cristaux liquides - Google Patents

Composition de cristaux liquides, dispositif d'affichage à cristaux liquides et procédé de production de dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2019009222A1
WO2019009222A1 PCT/JP2018/024989 JP2018024989W WO2019009222A1 WO 2019009222 A1 WO2019009222 A1 WO 2019009222A1 JP 2018024989 W JP2018024989 W JP 2018024989W WO 2019009222 A1 WO2019009222 A1 WO 2019009222A1
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Prior art keywords
liquid crystal
group
monomer
layer
display device
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English (en)
Japanese (ja)
Inventor
真伸 水▲崎▼
博司 土屋
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Sharp Corp
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Sharp Corp
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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
    • C09K19/38—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 composition, a liquid crystal display device, and a method of manufacturing the liquid crystal display device. More specifically, the present invention relates to a liquid crystal composition capable of forming an alignment control layer, a liquid crystal display device having an alignment control layer, and a method of manufacturing the same.
  • a liquid crystal display device is a display device using a liquid crystal composition for display, and a typical display method thereof is to irradiate light from a backlight to a liquid crystal panel in which the liquid crystal composition is sealed between a pair of substrates The amount of light transmitted through the liquid crystal panel is controlled by applying a voltage to the liquid crystal composition to change the alignment of the liquid crystal material.
  • a liquid crystal display device is used for electronic devices such as a smartphone, a tablet PC, and a car navigation because it has features such as thinness, light weight and low power consumption.
  • a horizontal electric field type display in which the alignment of the liquid crystal material is controlled mainly by rotating in a plane parallel to the substrate surface
  • the mode is attracting attention.
  • Examples of the transverse electric field display mode include an in-plane switching (IPS) mode and a fringe field switching (FFS) mode.
  • the alignment of the liquid crystal material in a state where no voltage is applied is generally controlled by the alignment film subjected to alignment treatment.
  • the alignment film is formed, for example, by applying an alignment film material such as polyamic acid on a substrate and then baking it.
  • a polymer-supported alignment technique (Polymer) in which a polymer layer is formed which controls the alignment of the liquid crystal material by polymerizing a polymerizable monomer added in the liquid crystal layer.
  • PSA technology Sustained alignment
  • it is also studied to control the alignment of the liquid crystal material by the polymer layer without forming a conventional alignment film see, for example, Patent Documents 1 and 2).
  • the PSA technology when the PSA technology is applied to the horizontal alignment mode such as the IPS mode or the FFS mode, the voltage holding ratio (VHR) and the contrast of the liquid crystal display may be lowered. It is considered that this is because the ultraviolet irradiation for polymerization is non-polarization light with high light irradiation intensity and the liquid crystal material is deteriorated.
  • the conventional material is irradiated with polarized light with low light irradiation intensity, the polymerization speed is slowed and the efficiency is lowered.
  • the conventional biphenyl-based or terphenyl-based monomer has no anisotropy in the molecular structure, and the polymer is formed because the monomer is irradiated with non-polarized ultraviolet light for polymerization. It is considered that the polymer in the layer is not oriented along the orientation of the orientation film under the polymer layer.
  • the present invention has been made in view of the above-mentioned present situation, and a liquid crystal composition and a liquid crystal display device capable of enhancing VHR and contrast, and a method of manufacturing a liquid crystal display device capable of manufacturing such a liquid crystal display device. And the purpose is to provide.
  • One aspect of the present invention may be a liquid crystal composition containing a liquid crystal material and at least one monomer, wherein the at least one monomer is at least one monomer represented by the following chemical formula (1) .
  • P 1 and P 2 are the same or different and each represents a vinyl group or an isopropenyl group.
  • Sp 1 and Sp 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond.
  • a 1 and A 2 are the same or different and each represents a linear, branched or cyclic saturated or unsaturated alkylene group having 1 to 12 carbon atoms, or a direct bond.
  • Z 1 and Z 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond. At least one hydrogen atom of the coumarin group may be substituted.
  • Another aspect of the present invention is a liquid crystal layer containing a liquid crystal material, a sealing material disposed so as to surround the liquid crystal layer in plan view, a pair of substrates sandwiching the liquid crystal layer, and the above in plan view
  • An alignment control layer arranged to be in contact with the liquid crystal layer is provided in a region surrounded by the sealing material, and the alignment control layer is formed such that the liquid crystal compound in the liquid crystal material is perpendicular or horizontal to the substrate surface.
  • a liquid crystal display comprising a polymer obtained by polymerizing at least one monomer, wherein the at least one monomer is at least one monomer represented by the chemical formula (1). It is also good.
  • a liquid crystal composition containing a liquid crystal material and at least one monomer is sealed between a pair of substrates joined by a sealing material to form a liquid crystal layer; And irradiating the layer with polarized ultraviolet light to form an alignment control layer formed by polymerizing the at least one monomer between the pair of substrates and the liquid crystal layer, wherein the at least one monomer is
  • the alignment control layer includes at least one monomer represented by the chemical formula (1), and the alignment control layer aligns the liquid crystal compound in the liquid crystal material in the vertical or horizontal direction with respect to the substrate surface.
  • Patent Document 1 discloses a liquid crystal composition which contains an alignment control material having high compatibility with other liquid crystal compositions and which is excellent in alignment control power, and polymerizes a polymerizable compound contained in the liquid crystal composition. It is disclosed that the orientation control layer is formed by Patent Document 2 discloses that a polyfunctional monomer having a symmetrical structure mixed in a liquid crystal is polymerized, and the liquid crystal is vertically aligned by the obtained ultraviolet-cured product.
  • Patent Document 3 discloses a liquid crystal alignment composition containing a photoreactive norbornene-based polymer, a binder, a reactive mesogen, and a photoinitiator.
  • Patent Documents 1 to 3 specifically disclose the monomer having a coumarin group and represented by the above-mentioned chemical formula (1), and it has not been studied to irradiate the above-mentioned monomer with polarized ultraviolet light. .
  • the said polyfunctional monomer is irradiated with non-polarizing ultraviolet rays and it superposes
  • the manufacturing methods of the liquid crystal display device of this invention differ in the point which irradiates a monomer with a polarization
  • the said patent document 3 apply
  • liquid crystal composition the liquid crystal display device, and the method for manufacturing a liquid crystal display device of the present invention, it is possible to increase VHR and contrast of the liquid crystal display device.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to Embodiment 1.
  • FIG. 1 is a schematic plan view of a liquid crystal display device according to Embodiment 1.
  • FIG. 5 is a schematic cross-sectional view of a liquid crystal display device according to a modification of Embodiment 1.
  • it is the model explaining the formation process of the orientation control layer, (a) represents before superposition
  • FIG. 6 is a schematic cross-sectional view of the liquid crystal display device according to Embodiment 2.
  • photoreactive monomer means a monomer that contains a photofunctional group.
  • photofunctional group means a functional group capable of causing a photoreaction.
  • the “viewing surface side” means a side closer to the screen (display surface) of the liquid crystal display device, and the “back side” refers to the screen (display surface) of the liquid crystal display device. Mean the more distant side.
  • the term “retardation layer” means a retardation layer that imparts an in-plane retardation of at least 10 nm to light having a wavelength of at least 550 nm.
  • light of wavelength 550 nm is light of wavelength with the highest human visibility.
  • ns represents the larger one of the principal refractive indices nx and ny in the in-plane direction of the retardation layer
  • nf is the smaller one of the principal refractive indices nx and ny in the in-plane direction of the retardation layer.
  • the principal refractive index refers to the value for light of wavelength 550 nm unless otherwise noted.
  • the in-plane slow axis of the retardation layer refers to an axis in a direction corresponding to ns, and the in-plane fast axis refers to an axis in a direction corresponding to nf.
  • d represents the thickness of the retardation layer.
  • “retardation” or “retardation” means in-plane retardation with respect to light having a wavelength of 550 nm unless otherwise noted.
  • in-cell a space between a pair of substrates included in a pair of substrates sandwiching a liquid crystal layer
  • outer side viewing side and back side
  • FIG. 1 is a schematic cross-sectional view of the liquid crystal display device according to the first embodiment.
  • FIG. 2 is a schematic plan view of the liquid crystal display device according to the first embodiment.
  • the liquid crystal display device 100 of the present embodiment includes a liquid crystal layer 30 containing a liquid crystal material, a sealing material 40 disposed so as to surround the liquid crystal layer 30 in plan view, and a seal.
  • the liquid crystal display device 100 further includes a backlight 70 behind any one of the pair of substrates 10 and 20.
  • the display area is an area for displaying an image recognized by the observer, and does not include a frame area.
  • a gate driver, a source driver, a display control circuit, and the like are accommodated.
  • narrowing the frame area narrowing the area of the sealing material to which the pair of substrates is attached is considered, but if the width of the sealing material is narrowed, the peeling strength between the substrates decreases. One substrate may peel off the other substrate.
  • the liquid crystal display device usually forms an alignment film on the surface of each substrate and then bonds the two substrates together with a sealing material to form a liquid crystal layer, so the alignment film is formed between the sealing material and the substrate Is intervened. Then, since the adhesive strength between the seal material and the alignment film is low, peeling easily occurs at the interface between the alignment film and the seal material, and as a result, peeling of the substrate may occur.
  • the reason for the low adhesive strength between the sealing material and the alignment film is that the surface of the alignment film is generally hydrophobic, while the resin contained in the sealing material is slightly hydrophilic, and these have low affinity. is there.
  • the liquid crystal display device 100 of the present embodiment may not have the conventional alignment film on the surface of the pair of substrates 10 and 20 on the liquid crystal layer 30 side, and the sealing material 40 20 are joined together.
  • the peeling strength can be enhanced, and the pair of substrates can be formed even when the width of the sealing material 40 is narrowed by narrowing the frame. It can hold 10 and 20 bonds.
  • the alignment film is not required to be formed at a position overlapping with the sealing material 40 at least in plan view, but the alignment film is only formed at a position overlapping the sealing material 40 in view of the accuracy of the printing apparatus used for forming the alignment film.
  • the alignment film is not formed on the entire surface of the pair of substrates 10 and 20.
  • the “alignment film” is a single-layer film or a laminate composed of polyimide, polyamic acid, polyamide, polymaleimide, polysiloxane, polysilsesquioxane, polyphosphazene, or a copolymer of these.
  • an alignment film material is directly applied (for example, application of polyimide or the like) or vapor deposition (for example, oblique deposition of silicon oxide (SiO)) on a substrate surface constituting a display region Thereby, an alignment film is formed.
  • the above-mentioned alignment film is not limited to the one to which the alignment treatment has been performed, as long as the existing alignment film material such as polyimide is coated or the existing alignment film material such as silicon oxide is obliquely deposited. .
  • FIG. 3 is a schematic cross-sectional view of a liquid crystal display device according to a modification of the first embodiment.
  • an alignment film 80 is provided between the alignment control layer 50 and at least one of the pair of substrates 10 and 20. It is also good.
  • the alignment film 80 may be one that aligns the liquid crystal compound in a desired direction, for example, one that aligns the liquid crystal compound uniformly in a predetermined direction, or one that does not align the liquid crystal compound in a desired direction, for example
  • the liquid crystal compound may be randomly aligned without being uniformly aligned.
  • the alignment film is formed between the alignment control layer 50 and at least one of the substrates 10 and 20 (more preferably, each of the substrates 10 and 20). It is preferable not to be provided.
  • an alignment film generally used in the field of liquid crystal display devices can be used.
  • polyimide, polyamic acid, polyamide, polymaleimide, polysiloxane, polysilsesquioxane, polyphosphazen, or A single layer film or a laminated film composed of at least one of these copolymers, or a film formed by oblique deposition of silicon oxide can be mentioned.
  • the alignment film 80 may not be subjected to the alignment process, but is preferably subjected to the alignment process.
  • the alignment treatment method is not particularly limited, and rubbing method, photo alignment method, etc. can be used, but the photo alignment method is preferable. This is because the alignment process of the alignment film 80 and the polymerization of monomers to be described later can be performed simultaneously, and the manufacturing process can be simplified.
  • the alignment film 80 preferably contains a polymer having a photofunctional group.
  • the light functional group of the alignment film 80 is irradiated with light (electromagnetic wave) such as ultraviolet light or visible light, for example, a structure such as dimerization (dimer formation), isomerization, light fleece transition, decomposition, etc.
  • the functional group is preferably a functional group capable of causing a change and expressing an orientation control force.
  • an azobenzene group, a chalcone group, a cinnamate group, a coumarin group, a tolan group, a stilbene group etc. are mentioned, for example.
  • Examples of the pair of substrates 10 and 20 include a combination of an active matrix substrate (TFT substrate) and a color filter (CF) substrate.
  • TFT substrate active matrix substrate
  • CF color filter
  • the active matrix substrate those generally used in the field of liquid crystal display devices can be used.
  • a configuration when the active matrix substrate is viewed in plan a plurality of parallel gate signal lines formed on the transparent substrate 21; a plurality of parallel gate signals extending in a direction orthogonal to the gate signal lines; Source signal lines; Active elements such as thin film transistors (TFTs) arranged corresponding to intersections of gate signal lines and source signal lines; arranged in a matrix in a region partitioned by gate signal lines and source signal lines.
  • TFTs thin film transistors
  • the structure provided with the pixel electrode 24 etc. is mentioned.
  • a common wiring; a common electrode 22 etc. connected to the common wiring are further provided.
  • the pixel electrode 24 and the common electrode 22 may be stacked via the insulating layer 23.
  • the TFT one in which a channel is formed of amorphous silicon, polysilicon, or IGZO (indium-gallium-zinc-oxygen) which is an oxide semiconductor is preferably used.
  • VHR voltage holding ratio
  • the color filter substrate those generally used in the field of liquid crystal display devices can be used.
  • the configuration of the color filter substrate include a configuration in which a black matrix 12 formed in a lattice shape, a lattice, ie, a color filter 13 formed inside a pixel, etc., is provided on a transparent substrate 11.
  • the color filter 13 may include a red color filter 13R, a green color filter 13G, and a blue color filter 13B.
  • the thickness of the blue color filter 13B may be thicker than the thickness of the red color filter 13R or the thickness of the green color filter 13G. By thickening the blue color filter 13B, the liquid crystal layer thickness can be reduced, and the cell thickness can be optimized.
  • the overcoat layer 14 and the seal material 40 are in contact with each other, but the peel strength of the seal material is not reduced.
  • the pair of substrates 10 and 20 may have both the color filter and the active matrix formed on one substrate.
  • the sealing material 40 is disposed so as to surround the periphery of the liquid crystal layer 30 in a plan view.
  • the sealing material 40 may be of a type that cures by light such as ultraviolet light, may be of a type that cures by heat, or is of a type that cures by both light and heat. It is also good.
  • Examples of the sealing material 40 include those containing an epoxy resin, a (meth) acrylic resin, and the like.
  • the sealing material 40 may contain an inorganic filler, an organic filler, a curing agent, or the like.
  • As the sealing material 40 for example, Photolec, manufactured by Sekisui Chemical Co., Ltd., can be used.
  • the width of the sealing material 40 in a plan view may be 0.4 mm or more and 5 mm or less.
  • a more preferable lower limit of the width of the sealing material 40 is 0.6 mm, a more preferable upper limit is 4 mm, and a still more preferable upper limit is 2 mm.
  • the width of the sealing material 40 may be 1.0 mm or less, and in the liquid crystal display device 100 of the present embodiment, the substrates 10 and 20 and the sealing material 40 can be in direct contact with each other, so 1.0 mm The substrate 10 and the substrate 20 can be sufficiently bonded even in the following cases.
  • the liquid crystal layer 30 contains a liquid crystal material containing at least one liquid crystal compound (liquid crystal molecules) 31.
  • the liquid crystal material is a thermotropic liquid crystal, and is preferably a liquid crystal material (nematic liquid crystal) exhibiting a nematic phase. It is preferable that the liquid crystal material undergoes a phase transition to an isotropic phase above a certain critical temperature (nematic phase-isotropic phase transition point (T NI )) when the temperature is raised from the nematic phase.
  • T NI critical temperature
  • the liquid crystal layer 30 preferably exhibits a nematic phase in the use environment of the liquid crystal display (eg, -40 ° C. to 90 ° C.).
  • the temperature of the nematic phase-isotropic phase transition point of the liquid crystal material is not particularly limited, and is, for example, 70 to 110 ° C.
  • the above T NI is a T NI of liquid crystal material before the monomer to be described later is added.
  • the liquid crystal material and the liquid crystal compound 31 may have a negative dielectric anisotropy ( ⁇ ) defined by the following formula, or may have a positive dielectric anisotropy. That is, the liquid crystal material and the liquid crystal compound 31 may have negative dielectric anisotropy or may have positive dielectric anisotropy, but from the viewpoint of contrast, it is negative. Those having the above dielectric anisotropy are preferable, and from the viewpoint of light resistance, those having the positive dielectric anisotropy are preferable. In addition, liquid crystal materials and liquid crystal compounds 31 having positive dielectric anisotropy have features such as high T NI and high-speed response (low rotational viscosity).
  • liquid crystal material having negative dielectric anisotropy for example, one having a ⁇ of ⁇ 1 to ⁇ 20 can be used.
  • liquid crystal material having positive dielectric anisotropy for example, one having a ⁇ of 1 to 20 can be used.
  • the liquid crystal layer 30 and the liquid crystal material may contain a liquid crystal compound (neutral liquid crystal compound) having no polarity, that is, ⁇ is substantially zero.
  • neutral liquid crystal compounds include liquid crystal compounds having an alkene structure.
  • a liquid crystal material and a liquid crystal compound having negative dielectric anisotropy are also referred to as a negative liquid crystal material and a negative liquid crystal compound, respectively, and a liquid crystal material and a liquid crystal compound having positive dielectric anisotropy are each positive liquid crystal material And positive-type liquid crystal compounds.
  • ⁇ (dielectric constant in the long axis direction)-(dielectric constant in the short axis direction)
  • the liquid crystal material may contain a liquid crystal compound having an alkenyl group.
  • the liquid crystal compound having an alkenyl group is preferably a neutral liquid crystal compound.
  • a liquid crystal compound having an alkenyl group is low in light resistance, and may be decomposed by irradiation with ultraviolet light to cause a decrease in VHR.
  • the orientation control layer 50 contains a polymer obtained by polymerizing a specific monomer, and the monomer has a coumarin group as a photofunctional group having anisotropy in light absorption.
  • the light irradiation intensity irradiated to the liquid crystal layer 30 can be largely reduced in principle compared to the non-polarized light, since it is polymerized by the polarized light which is light only in the uniaxial direction to express the alignment control force.
  • the positive liquid crystal compound exhibits high light resistance. Therefore, even if a liquid crystal compound having an alkenyl group is introduced into the liquid crystal material, reliability problems such as a decrease in VHR are less likely to occur.
  • the liquid crystal compound having an alkenyl group may be a compound represented by any one of the following chemical formulas (4-1) to (4-4). Any of these may be used alone, or two or more may be used in combination.
  • liquid crystal compound having an alkenyl group for example, a compound represented by the following chemical formula (4-1-1) can be mentioned.
  • the orientation control layer 50 is disposed in a region surrounded by the sealing material 40 in plan view as shown in FIG.
  • the alignment control layer 50 is disposed in contact with the liquid crystal layer 30 and aligns the liquid crystal compound 31 in the liquid crystal material contained in the liquid crystal layer 30 in the horizontal direction with respect to the substrates 10 and 20.
  • the alignment control layer 50 controls the alignment of the liquid crystal material in a state where a voltage higher than the threshold of the liquid crystal material is not applied to the liquid crystal layer 30.
  • the alignment of the liquid crystal compound 31 in the liquid crystal material in the horizontal direction with respect to the surfaces of the substrates 10 and 20 means that the pretilt angle of the liquid crystal material with respect to the surfaces of the substrates 10 and 20 is 10 ° or less.
  • the pretilt angle is more preferably 3 ° or less.
  • the pretilt angle is an angle formed by the major axis of the liquid crystal material (liquid crystal compound 31) with respect to the surface of the substrate when the voltage applied to the liquid crystal layer 30 is less than the threshold voltage (including no voltage application).
  • the plane is 0 ° and the substrate normal is 90 °.
  • the orientation control layer 50 contains a polymer obtained by polymerizing at least one monomer added to the liquid crystal layer 30, and the at least one monomer is a photofunctional group having anisotropy in light absorption (hereinafter referred to as polarization) And a monomer having a light absorbing functional group (hereinafter also referred to as a polarization absorbing monomer). Therefore, the orientation control layer 50 is a polymer layer containing a polymer including at least a unit derived from the polarization absorbing monomer.
  • the at least one monomer may be a monofunctional monomer having one polymerizable group, but the polymerizable group is preferably a plurality of polyfunctional monomers, and in particular, a difunctional monomer having two polymerizable groups is preferable. It is suitable.
  • the contrast of the liquid crystal display device 100 can be improved by forming the alignment control layer 50 containing a polymer containing a unit derived from the above-mentioned polarization absorbing monomer.
  • the reason is considered as follows. Since the polarized light absorbing functional group has anisotropy in light (preferably ultraviolet) absorption, it exhibits orientation upon irradiation with polarized light (preferably polarized ultraviolet, more preferably linearly polarized ultraviolet). More specifically, the irradiation of polarized light causes a light absorption functional group oriented in a specific orientation corresponding to the direction of the polarization axis to photoreact. As a result, along the specific orientation, the polarization absorbing monomer is polymerized to form a polymer.
  • the liquid crystal compound 31 is aligned in a desired alignment direction by the alignment control layer 50 derived from the polarization absorbing monomer, so that the contrast of the liquid crystal display device 100 can be improved.
  • the polarization absorbing monomer is polymerized along the alignment orientation of the alignment film 80 to form a polymer by appropriately setting the polarization axis direction of the polarized light to be irradiated. Ru. Therefore, also in this case, the contrast of the liquid crystal display device 100 can be improved.
  • the above-mentioned polarized light absorbing monomer has a polarized light absorbing functional group, and the polarized light absorbing functional group absorbs polarized light (preferably polarized ultraviolet light, more preferably linearly polarized ultraviolet light) to exhibit an alignment control force. it can. Since the irradiation of polarized light irradiates only light in the uniaxial direction, the light irradiation intensity to be irradiated to the liquid crystal layer 30 can be lower (weaker) in principle than the irradiation of non-polarized light. As a result, the generation of impurities due to the deterioration of the alignment film 80 and the liquid crystal compound 31 can be suppressed, and the VHR can be improved.
  • polarized light preferably polarized ultraviolet light, more preferably linearly polarized ultraviolet light
  • the alignment control layer 50 can align the liquid crystal compound 31 in the liquid crystal material in the horizontal direction with respect to the substrate surface.
  • the above-mentioned polarization absorbing monomer has at least one (preferably two or more, more preferably two) polymerizable groups, and is polymerized by irradiation with light such as ultraviolet rays to form a polymer. The polymer separates the liquid crystal layer 30 to form the alignment control layer 50.
  • the photofunctional group of the monomer is anisotropic.
  • polarizers are set on both sides of an object to be measured (for example, a film or a solution). Then, the polarizers are arranged in a crossed Nicol arrangement and a parallel Nicol arrangement, each light absorption spectrum is measured, and based on the measured light absorption spectrum, the presence or absence of anisotropy is confirmed by comparing the absorbance at the same wavelength. If there is a difference in absorbance between the cross nicol arrangement and the parallel nicol arrangement, the photofunctional group to be measured has anisotropy in the absorption of light of that wavelength.
  • the polarization absorbing functional group for example, from the viewpoint of orienting the liquid crystal compound 31 in the horizontal direction with respect to the surfaces of the substrates 10 and 20 and controlling the orientation of the liquid crystal compound 31, it has a substituent.
  • a coumarin group, a cinnamate group which may have a substituent, a chalcone group which may have a substituent, an azobenzene group which may have a substituent, etc. may be mentioned.
  • the coumarin group which may have a substituent is used.
  • the at least one monomer includes a monomer having a coumarin group which may have a substituent as a photoreactive monomer, and the coumarin group which may have a substituent functions as a photofunctional group.
  • the characteristic of the coumarin group is that there is no freely rotatable single bond, the molecular rigidity is high, the formed orientation control layer 50 becomes stable, and as a result, high contrast can be obtained even in the horizontal orientation mode.
  • Another characteristic of the coumarin group is that the burn-in (AC burn-in) derived from the change in the orientation of the liquid crystal compound 31 due to the application of an alternating voltage can be suppressed to a low level.
  • the kind of said substituent is not specifically limited, A halogen group, a methyl group, a methoxy group, an ethyl group, and an ethoxy group can be mentioned as a suitable example. Any of these may be used alone, or two or more may be used in combination. That is, the substituent preferably contains at least one substituent selected from the group consisting of a halogen group, a methyl group, a methoxy group, an ethyl group and an ethoxy group.
  • the at least one monomer may include a monomer having a coumarin group having a substituent and a monomer having a coumarin group having no substituent.
  • a fluoro group and a chloro group are suitable.
  • the substituent is usually substituted with at least one hydrogen atom of a ring structure such as a benzene ring of the coumarin group.
  • the coumarin group may be a monovalent functional group, but is preferably a bivalent coumarin group represented by the following chemical formula (3).
  • Examples of the photoreaction of the polarized light absorbing functional group generated by polarized light irradiation include dimerization reaction (dimer formation), isomerization reaction, light fleece transfer reaction, decomposition reaction and the like, but the coumarin group is a polarized ultraviolet light. Irradiation (preferably with linear polarized ultraviolet light) results in a dimerization reaction (dimerization).
  • the monomer which has the coumarin group which may have the said substituent contains at least 1 type of monomer (Hereinafter, it is also called a monomer (1).) Represented by following Chemical formula (1).
  • P 1 and P 2 are the same or different and each represents a vinyl (ethenyl) group or an isopropenyl (1-methylethenyl) group.
  • Sp 1 and Sp 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond.
  • a 1 and A 2 are the same or different and each represents a linear, branched or cyclic saturated or unsaturated alkylene group having 1 to 12 carbon atoms, or a direct bond.
  • Z 1 and Z 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond. At least one hydrogen atom of the coumarin group may be substituted.
  • At least one hydrogen atom in the ring structure is the same or different and is substituted by a halogen atom (preferably a fluorine atom or a chlorine atom), a methyl group, a methoxy group, an ethyl group or an ethoxy group May be
  • monomer (1) More specific examples of the monomer (1) include, for example, compounds represented by any one of the following chemical formulas (1-1) to (1-4). Any of these may be used alone, or two or more may be used in combination.
  • monomer (1) More specific examples of the monomer (1) include, for example, compounds represented by any one of the following chemical formulas (2-1) to (2-12). Any of these may be used alone, or two or more may be used in combination.
  • n 2, 4, 6, 8, 10 or 12
  • the monomer (1) preferably contains at least one of the monomer represented by the chemical formula (2-1) and the monomer represented by the chemical formula (2-2).
  • the monomers represented by the chemical formulas (2-1) and (2-2) do not have a spacer between the polymerizable group and the coumarin group, and the liquid crystal alignment can be further enhanced.
  • Polarizers (linear polarizers) 60 may be disposed on the opposite sides of the pair of substrates 10 and 20 to the liquid crystal layer 30, respectively.
  • a polyvinyl alcohol (PVA) film in which an anisotropic material such as an iodine complex having dichroism is adsorbed and oriented can be mentioned.
  • protective films such as a triacetyl-cellulose film, are laminated on both surfaces of a PVA film, and it uses for practical use.
  • an optical film such as a retardation film may be disposed between the polarizing plate 60 and the pair of substrates 10 and 20.
  • the transmission axes of the pair of polarizing plates 60 are preferably orthogonal to each other. According to such a configuration, since the pair of polarizing plates 60 is disposed in cross nicol, a good black display state can be realized when no voltage is applied.
  • that two axes (directions) are orthogonal means that an angle (absolute value) between the two is within a range of 90 ⁇ 3 °, preferably 90 ⁇ 3 °, unless otherwise specified. It is in the range of 1 °, more preferably in the range of 90 ⁇ 0.5 °, and particularly preferably 90 ° (perfectly orthogonal).
  • the backlight 70 is disposed on the back side of the liquid crystal panel.
  • a liquid crystal display device having such a configuration is generally called a transmissive liquid crystal display device.
  • the backlight 70 is not particularly limited as long as it emits light including visible light, and may emit light including only visible light, and emits light including both visible light and ultraviolet light It may be
  • the liquid crystal display device of the present embodiment includes an external circuit such as a TCP (tape carrier package) and a PCB (printed wiring board) other than the liquid crystal panel and the backlight 70; an optical film such as a viewing angle widening film or a brightness enhancement film It is composed of a plurality of members such as a bezel (frame), and some members may be incorporated into other members.
  • the members other than the members described above are not particularly limited, and members that are usually used in the field of liquid crystal display devices can be used, so the description will be omitted.
  • the liquid crystal display device 100 may be in a horizontal electric field display mode.
  • the transverse electric field display mode include an IPS mode, an FFS mode, and an electric field control birefringence (ECB) mode.
  • the IPS mode and the FFS mode are preferable.
  • a structure including a planar electrode, a slit electrode, and an insulating film disposed between the planar electrode and the slit electrode is provided on at least one of the substrates 10 and 20.
  • An oblique electric field is formed in the liquid crystal layer 30.
  • the slit electrode, the insulating film, and the planar electrode are arranged in this order from the liquid crystal layer 30 side.
  • the slit electrode for example, one having a linear opening surrounded by the electrode as a slit, or a linear cut provided with a plurality of comb teeth and disposed between the comb teeth is available. It is possible to use a comb-shaped one that constitutes a slit.
  • At least one of the substrates 10 and 20 is provided with a pair of comb electrodes, and a transverse electric field is formed in the liquid crystal layer 30.
  • a pair of comb-shaped electrodes for example, an electrode pair provided with a plurality of comb teeth and arranged so that the comb teeth mesh with each other can be used.
  • a pixel electrode is provided on one of the substrates 10 and 20
  • a counter electrode is provided on the other substrate
  • a liquid crystal material having positive dielectric anisotropy is used.
  • the retardation of the liquid crystal material is changed by the voltage applied between the pixel electrode and the counter electrode to control transmission and non-transmission of light.
  • the liquid crystal drive mode of the liquid crystal display device 100 is the horizontal alignment mode
  • the liquid crystal drive mode according to the present embodiment is not particularly limited, and is the vertical alignment mode.
  • the alignment control layer 50 may align the liquid crystal compound 31 in the liquid crystal material in a direction substantially perpendicular to the surfaces of the substrates 10 and 20.
  • the method for manufacturing a liquid crystal display device includes the steps of: sealing a liquid crystal composition containing a liquid crystal material and at least one monomer between a pair of substrates joined by a sealing material to form a liquid crystal layer; Irradiating the liquid crystal layer with polarized ultraviolet light to form an alignment control layer formed by polymerizing the at least one monomer between the pair of substrates and the liquid crystal layer; Is one containing at least one monomer (monomer (1)) represented by the chemical formula (1), and the alignment control layer aligns the liquid crystal compound in the liquid crystal material in the horizontal direction with respect to the substrate surface , and the nematic phase of the liquid crystal material - when isotropic phase transition point was T NI, in the step of forming the orientation control layer, the liquid crystal layer T NI + 3 ° C.
  • the liquid crystal composition of the present embodiment contains a liquid crystal material and at least one monomer, and the at least one monomer includes at least one monomer (monomer (1)) represented by the chemical formula (1). It may be a liquid crystal composition.
  • the method of manufacturing a liquid crystal display device of the present embodiment includes the step of sealing a liquid crystal composition containing a liquid crystal material and at least one monomer between a pair of substrates joined by a sealing material to form a liquid crystal layer. .
  • at least one of the pair of substrates (more preferably, the pair) is preferably formed prior to the step of forming the liquid crystal layer from the viewpoint of reliably increasing the peeling strength between the pair of substrates. It is preferable not to have the step of forming an alignment film on the surface of both substrates (a) and (b), in which case the pair of substrates are bonded directly to the sealing material without the alignment film.
  • the method of manufacturing the liquid crystal display device of the present embodiment has a step of forming an alignment film on at least one surface of a pair of substrates before the step of forming the liquid crystal layer from the viewpoint of long-term reliability.
  • an alignment film is interposed between at least one of the pair of substrates and the sealing material, and the pair of substrates are joined via the alignment film.
  • the alignment film is formed, for example, by applying an alignment film material containing polyamic acid or the like on at least one surface of a pair of substrates, baking the solvent after evaporation of the solvent in the alignment film material by heating. be able to. Thereafter, the alignment film may or may not be subjected to alignment treatment before the step of forming the liquid crystal layer.
  • Examples of the alignment treatment include rubbing treatment, and light alignment treatment such as ultraviolet irradiation.
  • the photoalignment treatment is performed, the polymerization of the monomer and the photoalignment treatment of the alignment film may be simultaneously performed by ultraviolet irradiation in the step of forming the alignment control layer. This enables simplification of the manufacturing process.
  • sealing of the liquid crystal composition may be performed as long as the liquid crystal composition is sandwiched between the pair of substrates by the sealing material, and the sealing material may not be cured.
  • the curing of the sealing material may be performed separately from the step of forming the orientation control layer described later, or may be performed simultaneously.
  • the sealing material may be of a type that cures with light such as ultraviolet light, or may be of a type that cures with heat, or a type that cures with both light and heat. It may be
  • the liquid crystal layer can be formed, for example, by filling a liquid crystal composition between a pair of substrates by a vacuum injection method or a drop injection method.
  • a liquid crystal layer is formed by sequentially applying a sealing material, bonding a pair of substrates, curing the sealing material, injecting a liquid crystal composition, and sealing an injection port in this order.
  • a liquid crystal layer is formed by performing application of a sealing material, dropping of a liquid crystal composition, bonding of a pair of substrates, and curing of the sealing material in this order.
  • the liquid crystal material may have negative dielectric anisotropy or may have positive dielectric anisotropy.
  • the liquid crystal material may contain a liquid crystal compound having an alkenyl group.
  • the liquid crystal material may contain one or more liquid crystal compounds.
  • the at least one monomer includes at least one monomer (monomer (1)) represented by the chemical formula (1).
  • the monomer (1) has a coumarin group which may have a substituent, and can absorb polarized light (preferably polarized ultraviolet light, more preferably linearly polarized ultraviolet light) to exhibit an alignment control force. Since the irradiation of polarized light irradiates only light in the uniaxial direction, the light irradiation intensity to be irradiated to the liquid crystal layer can be theoretically lowered compared to the irradiation of non-polarized light. As a result, generation of impurities due to deterioration of the alignment film and the liquid crystal molecules can be suppressed, and VHR can be improved.
  • the content of the monomer (1) in the liquid crystal composition is preferably 0.03% by weight or more and 5% by weight or less, and more preferably 0.05% by weight or more and 4.5% by weight or less. More preferably, it is 0.1% by weight or more and 3% by weight or less. If the concentration of the monomer (1) is too low, the horizontal alignment control of the liquid crystal compound may not be sufficiently controlled by the alignment control layer, and if the concentration of the monomer (1) is too high, long-term reliability due to the remaining monomer (1) There is a possibility of sexual decline.
  • the liquid crystal layer is irradiated with polarized ultraviolet light, and an alignment control layer formed by polymerizing the at least one monomer is formed between the pair of substrates and the liquid crystal layer.
  • the polarized ultraviolet light is preferably linear polarized ultraviolet light.
  • the alignment control layer is formed at the interface between the pair of substrates and the liquid crystal layer if it does not have the step of forming the alignment film, and it has the step of forming the alignment film, it is the interface between the substrate or the alignment film and the liquid crystal layer Is formed.
  • the alignment control layer is formed at the interface between each alignment film and the liquid crystal layer, and when the alignment film is formed on only one of the substrates, the alignment control layer is the alignment film and the alignment film. It is formed at the interface with the liquid crystal layer, and at the interface between the substrate where the alignment film is not formed and the liquid crystal layer.
  • the alignment film is subjected to the alignment processing in this step.
  • the wavelength of the polarized ultraviolet light may be 200 nm or more and 430 nm or less.
  • the more preferable lower limit of the wavelength is 250 nm, and the more preferable upper limit is 380 nm.
  • Dose of the polarized ultraviolet is, 0.3 J / cm 2 or more, may be 20 J / cm 2 or less.
  • the more preferable lower limit of the irradiation dose is 1 J / cm 2
  • the more preferable upper limit is 5 J / cm 2 .
  • FIG. 4 is a schematic view illustrating the formation process of the alignment control layer in the method of manufacturing the liquid crystal display device of Embodiment 1, where (a) shows before polymerization of the monomer, and (b) shows after the polymerization of the monomer. Represent. Arrows in FIG. 4 (a) represent polarized ultraviolet light. As shown in FIG.
  • polarized ultraviolet light is irradiated while heating the liquid crystal layer 30 containing the liquid crystal material containing the liquid crystal compound 31 and at least one monomer. Thereby, at least one monomer is polymerized to form a polymer.
  • the phase separation from the liquid crystal layer causes the polymer to form an alignment control layer 50 between the pair of substrates and the liquid crystal layer, as shown in FIG. 4B.
  • the liquid crystal layer 30 By heating the liquid crystal layer 30 at a temperature of T NI + 3 ° C. or higher of the liquid crystal material, it is possible to prevent the state of the irradiated polarized ultraviolet light from being changed by the liquid crystal material in the liquid crystal layer. High contrast) liquid crystal display devices.
  • the upper limit of the heating temperature is T NI + 20 ° C. of the liquid crystal material from the viewpoint of suppressing the thermal deterioration of the liquid crystal material as much as possible.
  • the conditions such as the heating time and the heating means are not particularly limited.
  • the method of measuring the nematic phase-isotropic phase transition point (T NI ) of the liquid crystal material is, for example, differential scanning calorimetry (DSC: Differential Scanning Calorimetry), or directly enclosing the liquid crystal material in a capillary and observing the temperature dependence. It can measure by a method etc.
  • DSC Differential Scanning Calorimetry
  • orientation control layer By forming the orientation control layer after the step of forming the liquid crystal layer, the pair of substrates sandwiching the liquid crystal layer are bonded to each other by the sealing material and surrounded by the sealing material in plan view An orientation control layer can be formed in the bottom area. Further, by forming a polarization absorbing monomer (preferably the above-mentioned photoreactive monomer) as a monomer for forming an alignment control layer, an alignment control layer is formed to align the liquid crystal material in the horizontal direction with respect to the substrate surface. Can.
  • a polarization absorbing monomer preferably the above-mentioned photoreactive monomer
  • the liquid crystal display device of the present embodiment is completed through a step of attaching a polarizing plate, and a step of attaching a control unit, a power supply unit, a backlight, and the like.
  • a pair of polarizing plates are disposed in cross nicol so that the absorption axes are orthogonal to each other on the outside of the pair of substrates, and the absorption axes of the pair of polarizing plates
  • the arrangement is made so that the angle formed with the irradiation axis of polarized ultraviolet light is 0 ° or 90 °.
  • the angle between the absorption axis of the pair of polarizing plates arranged in cross nicol and the irradiation axis is, for example, 45 °, and light from the backlight passes through the liquid crystal layer Will be displayed white.
  • the irradiation axis is the vibration direction of polarized ultraviolet light. Orientation division processing can also be performed by changing the irradiation direction of polarized ultraviolet light to the substrate.
  • the liquid crystal display device 100 is preferably in a horizontal electric field display mode.
  • the transverse electric field display mode include an IPS mode, an FFS mode, and an electric field control birefringence (ECB) mode.
  • the IPS mode and the FFS mode are preferable.
  • Embodiment 1 features specific to the present embodiment will be mainly described, and descriptions of contents overlapping with the first embodiment will be omitted. Further, in the present embodiment and the first embodiment, members having the same or similar functions are given the same reference numerals, and in the present embodiment, the description of the members is omitted.
  • the present embodiment is substantially the same as Embodiment 1 except that the in-cell retardation layer and the out-cell retardation layer are provided, as described below.
  • Liquid crystal displays are sometimes used under strong external light such as outdoors. For this reason, in recent years, there has been a demand for a liquid crystal display device excellent in outdoor visibility, in which reflection of external light is suppressed.
  • a method of suppressing the reflection of external light in a liquid crystal display device it is conceivable to provide a circularly polarizing plate made of a combination of a retardation layer and a linear polarizing plate.
  • two retardation layers are used in order to simultaneously realize the reflection preventing function of external light and the liquid crystal display. In that case, two retardation layers are provided inside and outside the liquid crystal cell.
  • the retardation layer inside the liquid crystal cell ie, the in-cell retardation layer
  • the orientation layer is only on one side of the in-cell retardation layer (RM), so the orientation of the in-cell retardation layer is low.
  • the thermal stability is lowered, and the retardation of the in-cell retardation layer is lowered when the firing step is performed to form an alignment film on the in-cell retardation layer. According to the present embodiment, it is possible to solve such a problem.
  • FIG. 5 is a schematic cross-sectional view of the liquid crystal display device according to the second embodiment.
  • the liquid crystal display device 100B of Embodiment 2 further includes an out-cell retardation layer 61 disposed between the substrate 10 and the polarizing plate 60, and an in-cell retardation layer 90 disposed between the substrate 10 and the orientation control layer 50 Have.
  • a stretched polymer film generally used in the field of liquid crystal display devices can be used.
  • the material of the polymer film include cycloolefin polymer, polycarbonate, polysulfone, polyether sulfone, polyethylene terephthalate, polyethylene, polyvinyl alcohol, norbornene, triacetyl cellulose, diacetyl cellulose and the like, among which cycloolefin polymer Is preferred.
  • the retardation layer formed of a cycloolefin polymer is excellent in durability, and has an advantage that the change in retardation when exposed to a high temperature environment or a high temperature and high humidity environment for a long time is small.
  • a film of a cycloolefin polymer "Zeonor film (registered trademark)” manufactured by Zeon Corporation of Japan, "ARTON (registered trademark) film” manufactured by JSR Corporation, and the like are known.
  • the in-cell retardation layer 90 is a laminate of an alignment layer 91 and a polymer 92 of a liquid crystalline monomer.
  • the orientation layer 91 controls the orientation of the liquid crystalline monomer that constitutes the polymer 92 to be laminated.
  • the liquid crystalline monomer can be fixed in a predetermined alignment direction, and a retardation layer having a desired retardation can be formed.
  • the in-cell retardation layer 90 in which the alignment layer 91 and the polymer 92 of the liquid crystalline monomer are laminated has low heat resistance, and a reduction in retardation due to heating tends to occur.
  • the in-cell retardation layer 90 is formed by laminating the alignment layer 91 and the polymer 92 of the liquid crystalline monomer, the in-cell retardation layer is formed by not forming an alignment film on the in-cell retardation layer 90. The reduction of the retardation of 90 can be effectively suppressed.
  • the alignment layer 91 for example, a single layer film or a laminated film composed of polyimide, polyamic acid, polyamide, polymaleimide, polysiloxane, polysilsesquioxane, polyphosphazene, or a copolymer thereof, or And films in which silicon oxide is formed by oblique deposition.
  • the alignment layer 91 is preferably subjected to an alignment process.
  • the alignment treatment method is not particularly limited, and a rubbing method, an optical alignment method, or the like can be used.
  • the alignment layer 91 preferably contains a polymer having a photofunctional group.
  • the light functional group of the alignment layer 91 is irradiated with light (electromagnetic wave) such as ultraviolet light or visible light to form, for example, a structure such as dimerization (dimer formation), isomerization, light fleece transition, decomposition, etc.
  • the functional group is preferably a functional group capable of causing a change and expressing an orientation control force.
  • an azobenzene group As a specific example of the said photofunctional group of the alignment layer 91, an azobenzene group, a chalcone group, a cinnamate group, a coumarin group, a tolan group, a stilbene group etc. are mentioned, for example.
  • the liquid crystalline monomer is a polymerizable monomer (reactive mesogen) having refractive index anisotropy.
  • the liquid crystalline monomer may be one in which the monomer itself has a phase difference, and is a monomer capable of exhibiting a phase difference when the liquid crystalline monomer is polymerized on the alignment layer 91 subjected to the alignment treatment. May be By polymerizing the liquid crystalline monomer, it is possible to suppress a decrease in retardation due to thermal fluctuation and to improve stability such as temperature stability.
  • the retardation of the in-cell retardation layer 90 is determined by the product of the birefringence ⁇ n of the polymer 92 of the liquid crystalline monomer and the thickness d of the in-cell retardation layer 90.
  • the liquid crystalline monomer may contain at least one of an acrylic monomer and a methacrylic monomer.
  • the acrylic monomer has an acrylic group as a polymerization group.
  • the above-mentioned methacrylic monomer has a methacrylic group as a polymerization group.
  • the liquid crystalline monomer is an acrylic monomer, it is advantageous in that the reaction rate is fast.
  • the liquid crystalline monomer is a methacrylic monomer, the glass transition point is high, so that the temperature dependence of retardation can be reduced.
  • liquid crystalline monomer examples include compounds represented by the following chemical formulas (5-1) to (5-15). Any of these may be used alone, or two or more may be used in combination.
  • X 1 and X 2 are the same or different and each represents a hydrogen atom or a methyl group.
  • g, h and i are the same or different and are integers of 1 to 18.
  • j and k are the same or different and are integers of 1 to 12.
  • the out-cell retardation layer 61 is preferably a retardation layer ( ⁇ / 4 plate) that imparts an in-plane retardation of 1 ⁇ 4 wavelength to light of at least 550 nm, specifically, at least 550 nm. Preferably, an in-plane retardation of 100 nm or more and 176 nm or less is given to the light of (1).
  • the out-cell retardation layer 61 functioning as a ⁇ / 4 plate, the combination of the polarizing plate 60 on the viewing surface side and the out-cell retardation layer 61 can function as a circularly polarizing plate. As a result, the internal reflection of the liquid crystal panel can be reduced, so that a good black display in which the reflection (reflection) of external light is suppressed can be realized.
  • the performance of the circularly polarized FFS mode liquid crystal is improved by further providing the in-cell retardation layer 90. be able to.
  • the in-plane slow axis of the out-cell retardation layer 61 is orthogonal to the in-plane slow axis of the in-cell retardation layer 90, and the retardation value of the out-cell retardation layer 61 and the retardation value of the in-cell retardation layer 90 are It is preferred that they be equal.
  • the out-cell retardation layer 61 and the in-cell retardation layer 90 can mutually cancel the retardation with respect to the light incident from the normal direction of the liquid crystal panel, and both are substantially optically A nonexistent state is realized. That is, a configuration is realized that is optically equivalent to the conventional liquid crystal panel in the transverse electric field mode with respect to light entering the liquid crystal panel from the backlight 70. Therefore, display in a transverse electric field mode using a circularly polarizing plate can be realized.
  • the in-cell retardation layer 90 is also preferably a retardation layer ( ⁇ / 4 plate) that imparts an in-plane retardation of 1 ⁇ 4 wavelength to light having a wavelength of at least 550 nm, specifically, It is preferable to provide an in-plane retardation of at least 100 nm and at most 176 nm to light of a wavelength of at least 550 nm.
  • the direction of the transmission axis of the back side polarizing plate 60 is defined as 0 °. At this time, it is preferable that the orientation of the transmission axis of the polarizing plate 60 on the viewing surface side be 90 °.
  • the in-plane slow axis of the out-cell retardation layer 61 and the in-plane slow axis of the in-cell retardation layer 90 are 45 ° with respect to the transmission axes of the pair of polarizing plates 60 from the viewpoint of exhibiting the function of the retardation layer. It is preferable to make an angle of That is, it is preferable that one of the in-plane slow axis of the out-cell retardation layer 61 and the in-plane slow axis of the in-cell retardation layer 90 be 45 ° in azimuth and the other be 135 ° in azimuth.
  • that the two axes (directions) form an angle of 45 ° indicates that the angle (absolute value) between the two is within the range of 45 ⁇ 3 ° unless otherwise specified.
  • it is in the range of 45 ⁇ 1 °, more preferably in the range of 45 ⁇ 0.5 °, and particularly preferably 45 ° (completely 45 °).
  • the in-plane slow axis of the in-cell retardation layer 90 is 45 °.
  • the initial alignment orientation of the liquid crystal material is 0 ° or 90 °
  • the in-plane slow axis of the out-cell retardation layer 61 is ⁇ 45 ° azimuth
  • the orientation of the transmission axis of the polarizing plate 60 on the viewing surface side is 90 °.
  • the liquid crystal display device 100B according to the second embodiment may include other constituent members.
  • the reflectance of the liquid crystal panel can be obtained. Can be further reduced.
  • a moth-eye film having a wrinkled surface structure is suitably used as the antireflective film.
  • the in-cell retardation layer 90 is disposed between the out-cell retardation layer 61 and the liquid crystal layer 30, and the case of applying to a transverse electric field mode using a circularly polarizing plate is described in detail.
  • the application of the in-cell retardation layer according to the present embodiment is not particularly limited, and the in-cell retardation layer may be used for liquid crystal display devices other than the transverse electric field mode using a circularly polarizing plate.
  • an in-cell retardation layer in which the presence or absence of a retardation function is patterned may be provided in the transflective liquid crystal display device, a retardation may be imparted to the reflective portion, and a retardation may not be imparted to the transmissive portion.
  • the patterning of the phase difference function can be realized, for example, by applying an alignment process to the alignment layer 91 of the reflective part using a mask and not performing an alignment process on the alignment layer 91 of the transmissive part.
  • the arrangement of the in-cell retardation layer according to the present embodiment is not particularly limited as long as it is between the base materials of a pair of substrates, and may be provided, for example, on both of the substrates 10 and 20 according to the application. And may be provided only on the substrate 20.
  • the liquid crystal drive mode of the liquid crystal display device of the present embodiment is described in detail in the case of the horizontal alignment mode, but the liquid crystal drive mode according to the present embodiment is not particularly limited. It may be an alignment mode, and the alignment control layer 50 may align the liquid crystal compound 31 in the liquid crystal material in a direction substantially perpendicular to the surfaces of the substrates 10 and 20.
  • the liquid crystal display device manufacturing method includes the step of forming an in-cell retardation layer on at least one of the pair of substrates before the step of forming the liquid crystal layer, except that the liquid crystal display device is manufactured. It is the same as the method of manufacturing a display device.
  • the liquid crystal composition the same liquid crystal composition as that of Embodiment 1 can be used also in this embodiment.
  • the in-cell retardation layer when the in-cell retardation layer is formed on a color filter substrate, for example, the in-cell retardation layer is formed after forming a black matrix, a color filter, an overcoat layer and the like. Form.
  • the in-cell retardation layer is formed on an active matrix substrate, for example, a common electrode, a pixel electrode, a TFT, various signal lines and the like are formed, and then the in-cell retardation layer is formed.
  • an alignment layer is formed on the surface of at least one substrate, a composition containing a liquid crystalline monomer is coated on the alignment layer, and the liquid crystalline monomer is polymerized.
  • the alignment layer may be, for example, an alignment layer composition containing polyimide, polyamic acid, polyamide, polymaleimide, polysiloxane, polysilsesquioxane, or polyphosphazene on at least one surface of a pair of substrates. It forms by apply
  • the alignment layer composition may contain a polymer having the above-described photofunctional group.
  • the alignment layer is preferably subjected to alignment treatment.
  • the alignment treatment method is not particularly limited, and a rubbing method, an optical alignment method, or the like can be used.
  • the polymerization of the liquid crystalline monomer is performed, for example, by irradiation with light such as visible light or ultraviolet light.
  • the polymerization of the liquid crystalline monomer is carried out in a bulk polymerization (bulk polymerization) without using a solvent or in a state where the concentration of the liquid crystalline monomer is high, so that the degree of polymerization of the liquid crystalline monomer is low. It is considered to be. Therefore, when the polymer of liquid crystalline monomer is laminated on the alignment layer to form the in-cell retardation layer, the heat resistance of the in-cell retardation layer is particularly low. For example, when heated at 200 ° C. or higher, the retardation tends to be reduced. .
  • the liquid crystalline monomer may contain at least one of an acrylic monomer and a methacrylic monomer.
  • a step of forming a liquid crystal layer and a step of forming an alignment control layer are performed as in the first embodiment.
  • FIG. 6 is a schematic view illustrating the formation process of the alignment control layer in the method of manufacturing a liquid crystal display device according to Embodiment 2.
  • (a) shows before polymerization of the monomer
  • (b) shows after the polymerization of the monomer.
  • FIG. 6A polarized ultraviolet light is irradiated while heating the liquid crystal layer 30 containing a liquid crystal material containing a liquid crystal compound and at least one monomer also in this embodiment.
  • the polarized ultraviolet light is irradiated from the side of the substrate (for example, the substrate 20) on which the in-cell retardation layer 90 is not formed. Is preferred. Irradiation of polarized ultraviolet light polymerizes at least one monomer to form a polymer. The phase separation from the liquid crystal layer causes the polymer to form an alignment control layer 50 between the pair of substrates and the liquid crystal layer, as shown in FIG. 6 (b).
  • the liquid crystal panel including the liquid crystal layer 30 is heated at the time of irradiation of polarized ultraviolet light, but the temperature is a relatively low temperature of T NI + 3 ° C. or more and T NI + 20 ° C. or less of the liquid crystal material. The influence on the retardation of the in-cell retardation layer 90 is small.
  • the alignment film 80 is disposed on a substrate (for example, the substrate 20) in which the in-cell retardation layer 90 is not formed, but in the present embodiment, the alignment film 80 is It does not have to be formed.
  • the liquid crystal composition was prepared by dissolving.
  • a liquid crystal panel in the FFS mode was actually produced by the following method.
  • a pixel electrode having an FFS electrode structure made of indium tin oxide (ITO), an ITO substrate on which an insulating film and a common electrode were stacked, and a counter substrate having no electrode were prepared.
  • a polyimide-based horizontal alignment agent After applying a polyimide-based horizontal alignment agent to both substrates, baking was performed at 200 ° C. for 40 minutes to form a horizontal alignment film (alignment film for rubbing).
  • a sealing material (Photolec, manufactured by Sekisui Chemical Co., Ltd.) is applied to one of the substrates without rubbing treatment to any horizontal alignment film, and the above is obtained in the region surrounded by the sealing material.
  • the liquid crystal composition was dropped, and the other substrate was bonded to produce a liquid crystal panel.
  • Comparative Example 1 An FFS mode liquid crystal panel of Comparative Example 1 was produced in the same manner as in Example 1 except for the following points.
  • a monomer represented by the following chemical formula (A) was added to the negative liquid crystal material.
  • VHR measurement VHR was measured under the conditions of 1 V and 70 ° C. using a model 6254 VHR measurement system manufactured by Toyo Corporation.
  • Example 1 using a monomer having a coumarin group is higher in contrast and VHR and smaller in rDC than Comparative Example 1 using a monomer having a biphenyl group.
  • the main reason for the high contrast of Example 1 is that the monomer has a coumarin group which is a polarization absorbing functional group, and is polymerized while being oriented by irradiation of linearly polarized ultraviolet light by itself and 90 with respect to the polarization axis of linearly polarized ultraviolet light. It is considered that the liquid crystal compound is in a high alignment state since the polymer is formed along the direction. Further, it is considered that the orientation of the horizontal alignment film also has a favorable effect on the orientation of the polymer.
  • the main factor that the contrast in Comparative Example 1 is low is that the monomer has a biphenyl group that is not a polarization absorbing functional group and polymerizes without being oriented by itself even upon irradiation with linearly polarized ultraviolet light,
  • the alignment state of the liquid crystal compound is lowered because the polymer is not formed along the 90 ° direction.
  • the polymer may be slightly oriented due to the influence of the horizontal alignment film.
  • the monomer using the monomer represented by the chemical formula (2-1) is more effective than the monomer using the monomer represented by the chemical formula (A) in the ultraviolet irradiation.
  • the consumption rate (polymerization rate) is fast, the polymer layer is formed faster, and as a result, the deterioration product of the horizontal alignment film is difficult to penetrate into the liquid crystal layer.
  • the factor that can be made smaller when using the monomer represented by the above chemical formula (2-1) than when using the monomer represented by the above chemical formula (A) Deterioration products of horizontal alignment film due to high polymerization rate), especially ionic impurities, are difficult to penetrate into liquid crystal layer, and polymer layer with coumarin group is more ionic impurity than polymer layer with biphenyl group It is speculated that the adsorption of
  • the liquid crystal composition was prepared by dissolving.
  • a liquid crystal panel in the FFS mode was actually produced by the following method. First, a pixel electrode having an FFS electrode structure made of indium tin oxide, an ITO substrate on which an insulating film and a common electrode were stacked, and a counter substrate having no electrode were prepared. Subsequently, a sealing material (Photolec, manufactured by Sekisui Chemical Co., Ltd.) is applied to one of the substrates, the liquid crystal composition obtained above is dropped onto the region surrounded by the sealing material, and the other substrate is bonded. A liquid crystal panel was produced.
  • a sealing material Photolec, manufactured by Sekisui Chemical Co., Ltd.
  • Example 2-2 in the same manner as example 2-1 except that in the step of forming the orientation control layer, linearly polarized ultraviolet light is irradiated at 1.7 mW / cm 2 for 1800 seconds (3 J / cm 2 ).
  • Example 2-3 in the same manner as example 2-1 except that in the step of forming the orientation control layer, linearly polarized ultraviolet light is irradiated at 1.7 mW / cm 2 for 3000 seconds (5 J / cm 2 ).
  • Comparative Example 2 A liquid crystal panel of Comparative Example 2 was produced in the same manner as in Example 2-1 except that the step of forming the alignment control layer was not irradiated with linearly polarized ultraviolet light (0 J / cm 2 ).
  • VHR may be decreased due to the deterioration of liquid crystal molecules due to the increase of the irradiation amount.
  • rDC decreased with the increase of polarized ultraviolet radiation.
  • the adsorption of ionic impurities in the liquid crystal layer is less likely to occur because the polymer layer is formed by the polymerization of the coumarin-based monomer.
  • Example 3-1 (Preparation of Liquid Crystal Composition) A liquid crystal compound (positive-type liquid crystal compound) having positive dielectric anisotropy and a liquid crystal compound (neutral liquid crystal compound) having an alkenyl group and having substantially zero dielectric anisotropy, and dielectric
  • a liquid crystal panel in the FFS mode was actually produced by the following method. First, a pixel electrode having an FFS electrode structure made of indium tin oxide, an ITO substrate on which an insulating film and a common electrode were stacked, and a counter substrate having no electrode were prepared. Subsequently, a sealing material (Photolec, manufactured by Sekisui Chemical Co., Ltd.) is applied to one of the substrates, the liquid crystal composition obtained above is dropped onto the region surrounded by the sealing material, and the other substrate is bonded. A liquid crystal panel was produced.
  • a sealing material Photolec, manufactured by Sekisui Chemical Co., Ltd.
  • Example 3-2 Example 3-2 Example 3-2 in the same manner as example 3-1 except that in the step of forming the orientation control layer, linearly polarized ultraviolet light was irradiated at 1.7 mW / cm 2 for 1800 seconds (3 J / cm 2 ).
  • Example 3-3 In the same manner as in Example 3-1, except that in the step of forming the orientation control layer, linearly polarized ultraviolet light was irradiated at 1.7 mW / cm 2 for 3000 seconds (5 J / cm 2 ) The liquid crystal panel of
  • Comparative Example 3 A liquid crystal panel of Comparative Example 3 was produced in the same manner as in Example 3-1 except that the step of forming the alignment control layer was not irradiated with linearly polarized ultraviolet light (0 J / cm 2 ).
  • VHR has a substantially constant value in the range of 0 to 5 J / cm 2 of polarized ultraviolet radiation, and is higher than when a liquid crystal material having negative dielectric anisotropy is used. It is presumed that a liquid crystal material having positive dielectric anisotropy is less likely to be deteriorated by ultraviolet irradiation, although the difference is small. rDC decreased significantly with the increase of polarized ultraviolet radiation.
  • the adsorption of ionic impurities in the liquid crystal layer is less likely to occur because the polymer layer is formed by the polymerization of the coumarin-based monomer.
  • the value was smaller by one digit than when a liquid crystal material having negative dielectric anisotropy was used. This is considered to be because, like the VHR results, the liquid crystal material having positive dielectric anisotropy is less likely to be deteriorated by ultraviolet irradiation.
  • Example 4-1 (Preparation of Liquid Crystal Composition) A liquid crystal compound (positive-type liquid crystal compound) having positive dielectric anisotropy and a liquid crystal compound (neutral liquid crystal compound) having an alkenyl group and having substantially zero dielectric anisotropy, and dielectric
  • T NI liquid crystal phase-isotropic phase transition point
  • a polarization absorbing monomer and the above photoreactive monomer alignment
  • a liquid crystal panel in the FFS mode was actually produced by the following method. First, a pixel electrode having an FFS electrode structure made of indium tin oxide, an ITO substrate on which an insulating film and a common electrode were stacked, and a counter substrate having no electrode were prepared. Subsequently, a sealing material (Photolec, manufactured by Sekisui Chemical Co., Ltd.) is applied to one of the substrates, the liquid crystal composition obtained above is dropped onto the region surrounded by the sealing material, and the other substrate is bonded. A liquid crystal panel was produced.
  • a sealing material Photolec, manufactured by Sekisui Chemical Co., Ltd.
  • a liquid crystal panel of Example 4-2 was produced in the same manner as in Example 4-1 except for the point.
  • a liquid crystal panel of Example 4-3 was produced in the same manner as in Example 4-1 except for the point.
  • a liquid crystal panel of Example 4-4 was produced in the same manner as in Example 4-1 except for the point.
  • a liquid crystal panel of Example 4-6 was produced in the same manner as in Example 4-1 except for the point.
  • FIG. 7 is a schematic view showing a sample for adhesive strength evaluation.
  • ⁇ Adhesive strength test> Production Examples 1, 2 and 3 were placed on a lighted backlight, and subjected to an aging test under a high temperature and high humidity environment where the temperature was kept at 60 ° C. and humidity 90% for 100 hours. Then, the adhesive strength before and behind the high temperature and high humidity test was measured. As shown in FIG. 7, the adhesive strength is adhesion when a load (open arrow) is applied to one of two glass plates bonded to a cross, and one of the glass plates and the sealing material are peeled off. The force was measured. The results are shown in Table 5 below.
  • Production Example 2 in which a polyimide-based horizontal alignment film (alignment film for rubbing) was formed had an initial adhesive strength of 2.6 kgf / mm and did not form an alignment film.
  • the adhesive strength (2.8 kgf / mm) was almost the same as that of the above, but the adhesive strength after the high temperature and high humidity test of Production Example 2 was 1.5 kgf / mm and was significantly reduced.
  • the initial adhesive strength was 1.0 kgf / mm, which was a lower value than Production Examples 1 and 2.
  • the adhesive strength after the high temperature and high humidity test of Production Example 3 further decreased to 0.2 kgf / mm or less.
  • Production Example 1 in which the alignment film was not formed had a high initial adhesion strength of 2.8 kgf / mm, and maintained a high value of 2.8 kgf / mm without any reduction in adhesion strength even after a high temperature and high humidity test. It was From the above results, even if the width of the sealing material is narrowed by narrowing the frame, in order to maintain high adhesive strength, conventional alignment films (both horizontal alignment films and vertical alignment films) as substrates for liquid crystal display devices It turned out that it is effective to use the substrate which does not have.
  • One embodiment of the present invention contains a liquid crystal material and at least one monomer, and the at least one monomer is at least one member represented by the following chemical formula (1)
  • the liquid crystal composition may be characterized by including a monomer (monomer (1)).
  • the liquid crystal composition containing the monomer (1) can improve VHR and contrast of a liquid crystal display device manufactured using the liquid crystal composition.
  • P 1 and P 2 are the same or different and each represents a vinyl group or an isopropenyl group.
  • Sp 1 and Sp 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond.
  • a 1 and A 2 are the same or different and each represents a linear, branched or cyclic saturated or unsaturated alkylene group having 1 to 12 carbon atoms, or a direct bond.
  • Z 1 and Z 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond. At least one hydrogen atom of the coumarin group may be substituted.
  • the at least one monomer represented by the chemical formula (1) is a monomer represented by the following chemical formula (2-1) and a monomer represented by the following chemical formula (2-2) Or at least one of the above.
  • the liquid crystal alignment can be further enhanced.
  • the liquid crystal material may have positive dielectric anisotropy. Thereby, the light resistance of the liquid crystal display device can be improved.
  • the liquid crystal material may have negative dielectric anisotropy. Thereby, the contrast of the liquid crystal display can be further improved.
  • the liquid crystal material may contain a neutral liquid crystal compound having an alkenyl group.
  • the response performance of the liquid crystal material can be improved and the speed can be increased.
  • a further aspect of the present invention is a liquid crystal layer containing a liquid crystal material, a sealing material disposed so as to surround the liquid crystal layer in plan view, and the liquid crystal layer And an alignment control layer disposed in contact with the liquid crystal layer in a region surrounded by the sealing material in plan view, the alignment control layer being in the liquid crystal material.
  • the liquid crystal compound is oriented in the vertical or horizontal direction with respect to the substrate surface, and contains a polymer obtained by polymerizing at least one monomer, and the at least one monomer is represented by the following chemical formula (1)
  • the liquid crystal display device may be characterized by containing at least one monomer (monomer (1)).
  • P 1 and P 2 are the same or different and each represents a vinyl group or an isopropenyl group.
  • Sp 1 and Sp 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond.
  • a 1 and A 2 are the same or different and each represents a linear, branched or cyclic alkylene group having 1 to 12 carbon atoms, or a direct bond.
  • Z 1 and Z 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond. At least one hydrogen atom of the coumarin group may be substituted.
  • the monomer (1) has a coumarin group which can function as a photofunctional group (polarization absorbing functional group) having anisotropy in light absorption, and the orientation control layer contains at least one of the monomers (1). Since the polymer obtained by polymerizing the monomer is contained, the contrast of the liquid crystal display device can be improved. Further, in the liquid crystal display device, since the pair of substrates can be bonded to each other by the sealing material without the conventional alignment film, the peeling strength between the substrates can be increased.
  • the said monomer (1) has the coumarin group which can function as a polarization absorption functional group, and can absorb polarization and can express alignment control power, compared with irradiation of non-polarized light, a liquid crystal layer In principle, it is possible to lower the light irradiation intensity for irradiating the light. As a result, deterioration of the liquid crystal material can be suppressed, and VHR can be improved. Furthermore, since the above-mentioned liquid crystal display device does not have to have a conventional alignment film requiring a firing step, even if the in-cell retardation layer is provided, the retardation of the in-cell retardation layer is lowered by the firing step. Can be effectively suppressed. Further, since the monomer (1) has a coumarin group, high contrast can be obtained even in the horizontal alignment mode.
  • the at least one monomer represented by the chemical formula (1) is a monomer represented by the following chemical formula (2-1) and a monomer represented by the following chemical formula (2-2) Or at least one of the above.
  • the liquid crystal alignment can be further enhanced.
  • the liquid crystal material may have positive dielectric anisotropy. Thereby, the light resistance of the liquid crystal display device can be improved.
  • the liquid crystal material may have negative dielectric anisotropy. Thereby, the contrast of the liquid crystal display can be further improved.
  • the liquid crystal material may contain a neutral liquid crystal compound having an alkenyl group.
  • the liquid crystal display device may further include an alignment film provided between the alignment control layer and at least one of the pair of substrates. Thereby, the long-term reliability of the liquid crystal display device can be improved.
  • the alignment film may contain polyimide.
  • the liquid crystal display device may be in the FFS mode or the IPS mode.
  • a liquid crystal composition containing a liquid crystal material and at least one monomer is sealed between a pair of substrates joined by a sealant.
  • the at least one monomer includes at least one monomer represented by the following chemical formula (1), and the alignment control layer is formed such that the liquid crystal compound in the liquid crystal material is perpendicular or horizontal to the substrate surface.
  • liquid crystal display device is intended to be oriented in a direction, nematic phase of the liquid crystal material - when isotropic phase transition point was T NI, in the step of forming the orientation control layer, the liquid crystal layer T NI + 3 ° C. or more, T NI +2 °C while heating at a temperature, or may be a method of manufacturing a liquid crystal display device, which comprises irradiating polarized ultraviolet rays.
  • P 1 and P 2 are the same or different and each represents a vinyl group or an isopropenyl group.
  • Sp 1 and Sp 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond.
  • a 1 and A 2 are the same or different and each represents a linear, branched or cyclic alkylene group having 1 to 12 carbon atoms, or a direct bond.
  • Z 1 and Z 2 are the same or different and are each an -O- group, -S- group, -COO- group, -OCO- group, -NHCO- group, -CONH- group, -NHCS- group, -CSNH- Represents a group or a direct bond. At least one hydrogen atom of the coumarin group may be substituted.
  • liquid crystal layer 31 liquid crystal compound (liquid crystal molecules) 40: sealing material 50: orientation control layer 60: polarizing plate 61: out-cell retardation layer 70: backlight 80: orientation film 90: in-cell retardation layer 91: orientation layer 92: polymer of liquid crystalline monomer 100, 100B: liquid crystal Display device

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Abstract

La présente invention concerne une composition de cristaux liquides et un dispositif d'affichage à cristaux liquides pouvant présenter un rapport de maintien de tension et un contraste améliorés, ainsi qu'un procédé de production de dispositif d'affichage à cristaux liquides permettant de produire un tel dispositif d'affichage à cristaux liquides. Le dispositif d'affichage à cristaux liquides selon la présente invention comprend : une couche de cristaux liquides contenant un matériau à cristaux liquides ; un élément d'étanchéité disposé de façon à entourer la couche de cristaux liquides, vue de dessus ; une paire de substrats prenant en sandwich la couche de cristaux liquides ; et une couche de régulation d'alignement disposée dans la région entourée par l'élément d'étanchéité, vue de dessus, de façon à être en contact avec la couche de cristaux liquides, la couche de régulation d'alignement étant utilisée pour aligner un composé de cristaux liquides dans le matériau à cristaux liquides dans une direction perpendiculaire ou horizontale par rapport à la surface des substrats et contenant un polymère obtenu par polymérisation d'au moins un type de monomère, ledit au moins un type de monomère contenant au moins un type de monomère présentant un groupe coumarine.
PCT/JP2018/024989 2017-07-07 2018-07-02 Composition de cristaux liquides, dispositif d'affichage à cristaux liquides et procédé de production de dispositif d'affichage à cristaux liquides Ceased WO2019009222A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020017622A1 (fr) * 2018-07-20 2020-01-23 公立大学法人兵庫県立大学 Composition photoréactive, cellule à cristaux liquides faisant appel à la composition photoréactive, et procédé de production de cellule à cristaux liquides
WO2021256428A1 (fr) * 2020-06-15 2021-12-23 大阪有機化学工業株式会社 Nouveau polymère, et film de photo-alignement et film de retard utilisant chacun ce polymère

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JP2012506878A (ja) * 2008-10-29 2012-03-22 メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング 液晶ディスプレイ
JP2014509332A (ja) * 2011-01-20 2014-04-17 メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング 重合性化合物および液晶ディスプレイにおけるそれらの使用
WO2018038014A1 (fr) * 2016-08-26 2018-03-01 シャープ株式会社 Composition de materiau d'étanchéite, cellule à cristaux liquides, et procédé de production d'une cellule à cristaux liquides

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JP2012506878A (ja) * 2008-10-29 2012-03-22 メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング 液晶ディスプレイ
JP2014509332A (ja) * 2011-01-20 2014-04-17 メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング 重合性化合物および液晶ディスプレイにおけるそれらの使用
WO2018038014A1 (fr) * 2016-08-26 2018-03-01 シャープ株式会社 Composition de materiau d'étanchéite, cellule à cristaux liquides, et procédé de production d'une cellule à cristaux liquides

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020017622A1 (fr) * 2018-07-20 2020-01-23 公立大学法人兵庫県立大学 Composition photoréactive, cellule à cristaux liquides faisant appel à la composition photoréactive, et procédé de production de cellule à cristaux liquides
JPWO2020017622A1 (ja) * 2018-07-20 2021-08-05 公立大学法人兵庫県立大学 光反応性組成物、光反応性組成物を用いた液晶セル、及び液晶セルの製造方法
JP7471577B2 (ja) 2018-07-20 2024-04-22 兵庫県公立大学法人 光反応性組成物、光反応性組成物を用いた液晶セル、及び液晶セルの製造方法
WO2021256428A1 (fr) * 2020-06-15 2021-12-23 大阪有機化学工業株式会社 Nouveau polymère, et film de photo-alignement et film de retard utilisant chacun ce polymère

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