US20060092349A1 - Phase difference control component, process for producing the same and liquid crystal display device - Google Patents

Phase difference control component, process for producing the same and liquid crystal display device Download PDF

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US20060092349A1
US20060092349A1 US11/175,959 US17595905A US2006092349A1 US 20060092349 A1 US20060092349 A1 US 20060092349A1 US 17595905 A US17595905 A US 17595905A US 2006092349 A1 US2006092349 A1 US 2006092349A1
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phase difference
difference control
liquid crystal
control layer
control component
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Norihisa Moriya
Kanami Ikegami
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Assigned to DAI NIPPON PRINTING CO., LTD. reassignment DAI NIPPON PRINTING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IKEGAMI, KANAMI, MORIYA, NORIHISA
Publication of US20060092349A1 publication Critical patent/US20060092349A1/en
Priority to US12/365,402 priority Critical patent/US20090142676A1/en
Priority to US15/092,933 priority patent/US10203555B2/en
Priority to US16/229,330 priority patent/US10481436B2/en
Priority to US16/654,428 priority patent/US10824015B2/en
Priority to US17/038,364 priority patent/US20210011320A1/en
Abandoned legal-status Critical Current

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    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • 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
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • 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
    • G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
    • G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
    • 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
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • 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
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/02—Alignment layer characterised by chemical composition
    • 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
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/03—Viewing layer characterised by 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133633—Birefringent elements, e.g. for optical compensation using mesogenic materials
    • 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
    • G02F1/133749—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for low pretilt angles, i.e. lower than 15 degrees

Definitions

  • the present invention relates to a phase difference control component comprising a liquid crystal material, which has excellent symmetry with respect to the angle of visibility and is optically compensable, and a process for producing the same, and a liquid crystal display device comprising said phase difference control component.
  • LCDs Color liquid crystal displays
  • features such as thin shape, light weight, low power consumption, and flickerless, and the market of color liquid crystal displays for PCs including notebook computers has been rapidly grown.
  • displays for PCs there is an increasing demand for desktop monitors which are larger in size than notebook computers.
  • LCDs have become utilized in PCs, as well as in TVs for which CRTs have hitherto been mainly utilized.
  • a small angle of visibility is a problem inherent in LCDs. This problem is caused by light leakage from pixels, which should originally display black, when LCDs are viewed in an oblique direction. Due to this light leakage, the inversion of contrast takes place, and proper display becomes impossible. As a result, the angle of visibility is lowered.
  • phase difference film is also used in combination with a linear polarization plate for creating various polarized states.
  • circularly polarized light can generally be constituted by a combination of a linearly polarizing plate with a ⁇ /4 (quarter-wave) phase difference plate.
  • phase difference films transparent polymeric films such as polycarbonate films subjected to stretching treatment such as monoaxial stretching have hitherto been used.
  • films formed by aligning and fixing a liquid crystal material having refractive index anisotropy while imparting given regularity can also be used.
  • the phase difference film using a liquid crystal material can constitute, through alignment control of liquid crystal molecules, positive and negative A plates, positive and negative C plates, and a phase difference layer with hybrid alignment in which the aligned state is continuously varied (see, for example, Japanese Patent Laid-Open No. 153712/1999).
  • An aligning film subjected to alignment treatment is necessary for horizontally aligning liquid crystal molecules against a base material in a monoaxial direction.
  • polyimide films subjected to rubbing treatment are generally used as the aligning film.
  • a pretilt angle an angle of liquid crystal molecules to the base material
  • This pretilt angle plays an important role in regulating the liquid crystal molecules so that, upon voltage application, the liquid crystal molecules are lifted unidirectionally. Therefore, the presence of a pretilt angle in the liquid crystal molecules is indispensable, and, at the same time, the pretilt angle should be controlled.
  • phase difference control component When a fixed liquid crystal material is used as the phase difference control component, however, the presence of a pretilt angle in liquid crystal molecules causes a change in the level of phase difference to become asymmetrical with respect to the vertical direction upon a change in angle of visibility in a direction other than the phase advance axis. In particular, when the angle of visibility is varied in an optical axis direction of liquid crystal molecules, the asymmetry of a change in level of the phase difference is most significant.
  • an aligning film 22 is coated on a base material 21 ( FIG. 2 ( a )).
  • the aligning film is rubbed, for example, by a rubbing roller 23 or the like ( FIG. 2 ( b )).
  • a liquid crystal material is coated on the aligning film subjected to rubbing treatment.
  • Molecular liquid crystals 24 make a pretilt angle ⁇ with the direction of rotation of the rubbing roller 23 for alignment ( FIG. 2 ( c )).
  • the level of phase difference when the level of phase difference is measured by varying the observation angle in a direction other than the phase advance axis, the level of the phase difference is asymmetrical with respect to 0 (zero) degree (vertical direction).
  • the asymmetry of the level of the phase difference is most significant.
  • a liquid crystal display device to which a phase difference control component formed of a liquid crystal material with a pretilt angle ⁇ has been applied suffers from a problem that, except for a change in observation angle in the phase advance axis, display images are different.
  • the pretilt angle also propagates in the thickness-wise direction of the film, when the phase difference layer comprises a plurality of liquid crystal layers stacked on top of each other, the alignment at the interface of the liquid crystal layers is adversely affected.
  • the necessary phase difference level should be calculated for design of the phase difference control component.
  • the level of the symmetry of the angle of visibility is low, a desired phase difference level can be realized only in any one direction and a phase difference control component, which can realize a satisfactorily large angle of visibility, cannot be provided.
  • the present inventors have now found that, when the pretilt angle of liquid crystal molecules constituting a phase difference control component is substantially 0 (zero) degree, the asymmetry of the phase difference does not occur.
  • the present invention has been made based on such finding.
  • an object of the present invention is to provide a phase difference control component, which has excellent phase difference symmetry and is optically compensable, capable of realizing a liquid crystal display device having a wide angle of visibility, and a process for producing the same.
  • the phase difference control component comprises: a base material; and a phase difference control layer formed of a fixed liquid crystal material provided on said base material through an aligning film, characterized in that
  • the angle of liquid crystal molecules, present at the interface of the aligning film and the phase difference control layer, to the base material is substantially 0 (zero) degree.
  • the application of the alignment controlling force to the liquid crystal material being carried out by a photoalignment method in which collimated deflected light is applied to the alignment film from the vertical direction.
  • a pretilt angle of substantially 0 degree means that, although, when liquid crystal molecules are microscopically observed, the liquid crystal molecules are very slightly tilted against the base material surface, since there is no regularity in the direction of lifting of the tilt, when the liquid crystal molecules are macroscopically observed, lifting angles are offset and, consequently, the pretilt angle is observed to be 0 degree.
  • phase difference control component In the phase difference control component according to the present invention, any pretilt angle does not exist in the liquid crystal molecules constituting the phase difference member. Therefore, the level of the phase difference symmetry is so high that the angle of visibility of the liquid crystal display device can be effectively increased. Further, a liquid crystal display device, which is excellent in symmetry of the angle of visibility, can be realized.
  • a phase difference layer having a pretilt angle of substantially 0 degree can be formed by using a photoalignment method and applying ultraviolet light in the vertical direction. Therefore, when the level of phase difference is measured by varying the observation angle in the slow phase axis direction, highly symmetrical phase difference control can be realized and, thus, a phase difference control component which can realize higher-accuracy optical compensation can be provided.
  • phase difference control component when the phase difference control component is stacked directly on a color filter, a higher-performance phase difference control component free from shrinkage with the elapse of time and peel-off which are problems of the conventional film-type phase difference control component can be provided.
  • FIG. 1 is a cross-sectional view illustrating a production process of a phase difference control component comprising a liquid crystal material by a photoalignment method according to the present invention
  • FIG. 2 is a cross-sectional view illustrating the step of aligning an aligning film by the conventional rubbing method
  • FIG. 3 is an explanatory view illustrating the case where the level of the phase difference is measured by varying the observation angle in the slow phase axis direction to positive values and negative values relative to 0 degree;
  • FIG. 4 is a diagram showing the results of measurement of retardation values (RE; nm) representing the level of phase difference by varying the observation angle (an elevation angle) of a phase difference control component in the working example in the range of ⁇ 45 degrees to +45 degrees in the slow phase axis direction; and
  • FIG. 5 is a diagram showing the results of measurement of retardation values (Re in nm) representing the level of phase difference by varying the observation angle (an elevation angle) of a phase difference control component in the range of ⁇ 45 degrees to +45 degrees in the slow phase axis direction by the conventional rubbing method for comparison with the working examples of the present invention.
  • the phase difference control component according to the present invention has a structure comprising a phase difference control layer provided on a base material through an aligning film. Individual layers constituting the phase difference control component according to the present invention will be descried.
  • a base material 11 on which an aligning film 12 is provided is either an inorganic base material, for example, a glass substrate formed of glass or quartz or silicon, or an organic base material.
  • Organic base materials include plastic substrates or films formed of polymethyl methacrylate or other acrylic resins, polyamides, polyacetals, polybutylene terephthalates, polyethylene terephthalates, polyethylene naphthalates, triacetylcelluloses, syndiotactic polystyrenes, polyphenylene sulfides, polyether ketones, polyether ether ketones, fluororesins, polyethernitriles, polycarbonates, modified polyphenylene ethers, polycyclohexenes, polynorbornenes resins, polysulfones, polyethersulfones, polysulfones, polyallylates, polyamide-imides, polyetherimides or thermoplastic polyimides.
  • the organic base material is not limited to those described above and conventional plastic films and the like may also be used.
  • glass substrates, plastic substrates and substrates comprising a color filter provided on a film may also be used as the base material.
  • the thickness of the base material 11 is not particularly limited and may vary depending upon applications, and, for example, base material having a thickness of about 1 nm to 5 ⁇ m may be used.
  • a substrate provided with a color filter may also be used as the base material.
  • a construction may also be adopted in which an aligning film is provided on a color filter and a phase difference control layer formed of a liquid crystal material is then stacked.
  • the aligning film used in the present invention may be formed by the following method.
  • a solution of an aligning film material dissolved in a solvent is prepared.
  • This solution is coated onto the base material 11 by spin coating, flexographic printing or the like to form a coating film.
  • the solvent is removed from the coating film to form an unaligned aligning film.
  • the aligning film is subjected to alignment treatment.
  • Alignment methods usable in the present invention for bringing the pretilt angle of liquid crystal molecules to substantially 0 degree include photoalignment, and rubbing treatment for aligning liquid crystal molecules in a direction perpendicular to the rubbing direction.
  • FIG. 1 ( b ) shows the step of subjecting an aligning film by photoalignment to alignment treatment.
  • collimated polarized light (ultraviolet light) 13 is applied to the aligning film 12 provided on the base material 11 for alignment of the aligning film 12 by photoalignment.
  • alignment methods using the photoalignment are roughly divided into photoisomerization types and photoreaction types according to the reaction mechanism. Photoreaction types are further subdivided into dimerization types, decomposition types, bonding types and the like.
  • azobenzene which causes cis-trans isomerization.
  • Azobenzene absorbs ultraviolet light of an electric field vector parallel to the molecular axis and consequently is converted from trans form to cis form.
  • Liquid crystal molecules are aligned parallel to azobenzene in trans form and thus are aligned in a direction perpendicular to the polarization direction of ultraviolet light. Accordingly, an aligning film having a pretilt angle of substantially 0 degree can be prepared.
  • Photoreaction types include dimerization of polyvinyl cinnamate, decomposition of polyimide resin, and bonding of polyimide having a benzophenone skeleton. All of these methods can form aligning films having a pretilt angle of 0 degree.
  • a rubbing technique for aligning liquid crystal molecules in a direction vertical to the rubbing direction may be mentioned as another alignment method for brining the pretilt angle of liquid crystal molecules to substantially 0 degree.
  • aligning films in which the pretilt angle of liquid crystal molecules is substantially 0 degree, can be prepared by using modified polyvinyl alcohols or polyimide or polyamic acid having a carbazole skeleton on its side chain.
  • the phase difference control layer 14 provided on the aligning film 12 is formed of a liquid crystal material. After the alignment treatment, the liquid crystal material should be fixed while maintaining the alignment.
  • FIG. 1 ( c ) shows a phase difference control layer 14 in such a state that liquid crystal molecules 15 have been aligned to a pretilt angle of substantially 0 degree. In the drawing, the liquid crystal molecules 15 are shown in a typically enlarged state.
  • liquid crystal material is fixed while holding the alignment of the liquid crystal molecules 15 .
  • preferred liquid crystal materials include polymeric liquid crystal materials, which have a glass transition temperature and, at a temperature below the glass transition temperature, can realize fixation of the liquid crystal structure, and photopolymerizable liquid crystal materials which can be cured by three-dimensional crosslinking upon exposed to ultraviolet light.
  • Monomer molecules which are three-dimensionally crosslinkable upon exposure to ultraviolet light include a mixture of a liquid crystal monomer and a chiral compound, as disclosed, for example, in Japanese Patent Laid-Open No. 258638/1995 and Published Japanese Translation of PCT Publication No. 508882/1998.
  • compounds represented by the following formulae (I) to (XI) or a mixture composed of two or more of them are suitable for use as the photopolymerizable liquid crystal material.
  • X is 2 to 5 (integer).
  • Y represents any one substituent selected from substituents represented by the following formulae (i) to (xxiv) and R 4 represents hydrogen or a methyl group.
  • X is preferably 2 to 12 (integer).
  • X is preferably 2 to 5 (integer).
  • the phase difference control layer 14 may be formed by providing the above photopolymerizable liquid crystal material or polymeric liquid crystal material, optionally dissolving or diluting the material with a solvent, coating the material onto a base material by spin coating, die coating, slit coating or other proper method, and removing the residual solvent, for example, by heat drying. Thereafter, a liquid crystal structure in which liquid crystal molecules have been aligned at a pretilt angle of substantially 0 degree is developed in the liquid crystal material.
  • ultraviolet light 16 is then applied to polymerize the photopolymerizable liquid crystal material, whereby a phase difference control layer 14 formed of a liquid crystal material, which holds a liquid crystal structure with liquid crystal molecules aligned at a pretilt angle of substantially 0 degree, can be formed.
  • the phase difference control layer has positive birefringence properties, and the optical axis thereof is parallel to the plane of the phase difference control layer.
  • a two-layer construction may also be adopted in which a second phase difference control layer, which has negative birefringence properties and has an optical axis perpendicular to the plane of the phase difference control component is stacked on the phase difference control layer which has positive birefringence properties and has an optical axis parallel to the plane of the phase difference control component.
  • phase difference control layer which has positive birefringence properties and has an optical axis perpendicular to the plane of the phase difference control layer is stacked on a first phase difference control layer which has positive birefringence properties and has an optical axis parallel to the plane of the phase difference control layer.
  • the phase difference control component according to the present invention may constitute a laminate structure.
  • a phase difference control layer having an optical axis parallel to the plane of the phase difference control layer is stacked on a color filter
  • a method may be adopted in which a photopolymerizable liquid crystal composition comprising a photopolymerization initiator incorporated in a polymerizable liquid crystal monomer is coated onto one side of a color filter to form a coating which is then exposed to ultraviolet light or the like to form a continuous one layer stacked on the color filter.
  • phase difference control layer having an optical axis perpendicular to the plane of the phase difference control layer
  • this layer can be formed in the same manner as described above, except that a photopolymerizable liquid crystal composition containing a polymerizable chiral agent is used.
  • the laminate structure in which the phase difference control component is stacked directly on the color filter can realize a high-performance phase difference control component free from shrinkage with the elapse of time and peeling which are problems of the conventional film-type phase difference control component.
  • the underlying color filters are different from each other in thickness depending upon color patterns of red, blue, and green, that is, the surface of the color filters is uneven.
  • a method is adopted in which the color filter is flattened by providing a transparent flattening layer on the color filter and the phase difference control component is then formed on the flattening layer.
  • a color filter is stacked on a phase difference control component.
  • a glass substrate (1737 glass, manufactured by Corning Inc.) which had been cleaned by a predetermined method was provided as a base material, and AL 1254 (manufactured by JSR Corporation) was provided as an aligning film material.
  • the aligning film material was coated by flexographic printing onto the glass substrate to form a 600 angstrom-thick aligning film.
  • polarized ultraviolet light was applied to the aligning film at 5 J/cm 2 in a direction vertical to the base material to form an aligning film by a photoalignment method to which monoaxial anisotropy had been imparted.
  • Ultraviolet-curable acrylate group-containing RMM 34 (manufactured by Merck & Co., Inc.) was used as a liquid crystal material for phase difference control layer formation. 20 parts by weight of RMM 34 was dissolved in propylene glycol monomethyl ether acetate as a solvent to prepare a composition for phase difference control layer formation.
  • composition for phase difference control layer formation prepared above was spin coated onto the base material with the aligning film formed thereon by the photoalignment method.
  • the same composition was coated on the base material with the aligning film formed thereon by the rubbing method.
  • Both the substrates with the composition coated thereon were heated on a hot plate at 100° C. for 5 min to remove the residual solvent and thus to develop a liquid crystal structure.
  • ultraviolet light was applied (500 mJ/cm 2 , 365 nm) to fix the liquid crystal structure and thus to form a phase difference control layer.
  • phase difference control components comprising a phase difference control layer provided on a base material through an aligning film were prepared.
  • retardation values (RE; nm) representing the level of phase difference were measured by varying the observation angle (an elevation angle) in the range of ⁇ 45 degrees to +45 degrees in the slow phase axis direction.
  • RFTS-3100 VA manufactured by Otsuka Electronics Co., Ltd. was used for the measurement. The results of measurement are shown in FIGS. 4 and 5 .
  • FIG. 4 shows the results of measurement for the phase difference control component according to the present invention prepared by forming an aligning film by photoalignment and providing a phase difference control layer formed of a liquid crystal material on the aligning film.
  • FIG. 5 shows the results of measurement for the comparative phase difference control component prepared by forming an aligning film by the conventional rubbing method and providing a phase difference control layer formed of a liquid crystal material on the aligning film.
  • phase difference properties are symmetrical with respect to the angle of visibility.
  • phase difference properties are asymmetrical.
  • a liquid crystal display device prepared using the phase difference control component by the photoalignment method according to the present invention shown in FIG. 4 exhibited display which was excellent in symmetry of the angle of visibility.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
US11/175,959 2004-07-07 2005-07-06 Phase difference control component, process for producing the same and liquid crystal display device Abandoned US20060092349A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US12/365,402 US20090142676A1 (en) 2004-07-07 2009-02-04 Process for producing a phase difference control component and liquid crystal display device
US15/092,933 US10203555B2 (en) 2004-07-07 2016-04-07 Process for producing a phase difference control component and liquid crystal display device
US16/229,330 US10481436B2 (en) 2004-07-07 2018-12-21 Process for producing a phase difference control component and liquid crystal display device
US16/654,428 US10824015B2 (en) 2004-07-07 2019-10-16 Process for producing a phase difference control component and liquid crystal display device
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US10824015B2 (en) 2020-11-03
US20190121184A1 (en) 2019-04-25
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