WO2001059513A1 - Element graphique a cristaux liquides en reflexion - Google Patents

Element graphique a cristaux liquides en reflexion Download PDF

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Publication number
WO2001059513A1
WO2001059513A1 PCT/JP2001/000708 JP0100708W WO0159513A1 WO 2001059513 A1 WO2001059513 A1 WO 2001059513A1 JP 0100708 W JP0100708 W JP 0100708W WO 0159513 A1 WO0159513 A1 WO 0159513A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
polarizing plate
optically anisotropic
crystal material
crystal display
Prior art date
Application number
PCT/JP2001/000708
Other languages
English (en)
Japanese (ja)
Inventor
Tetsuya Uesaka
Takehiro Toyooka
Yoshihiro Kumagai
Original Assignee
Nippon Mitsubishi Oil Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2000029512A external-priority patent/JP2001222006A/ja
Priority claimed from JP2000036720A external-priority patent/JP2001228328A/ja
Application filed by Nippon Mitsubishi Oil Corporation filed Critical Nippon Mitsubishi Oil Corporation
Publication of WO2001059513A1 publication Critical patent/WO2001059513A1/fr

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Classifications

    • 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
    • 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
    • G02F1/133637—Birefringent elements, e.g. for optical compensation characterised by the wavelength dispersion
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/02—Function characteristic reflective
    • 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
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/08—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates with a particular optical axis orientation

Definitions

  • the present invention relates to a reflective liquid crystal display device having an optical anisotropic body and a polarizing plate and having good contrast.
  • the liquid product indication device IS a T N (twisted nematic) type and an S T N (one part isted nematic) type are mainly used.
  • the above STN-type liquid crystal display device generally has a structure in which a liquid crystal cell is sandwiched between a pair of polarizing plates.
  • a structure in which a reflector is disposed further outside is usually provided.
  • the twist angle of the liquid crystal molecule in the liquid crystal cell is set to 90 ° or more, and the setting angle of the transmission axis of the polarizing plate with respect to the elliptically polarized light generated by the birefringence effect of the liquid crystal cell is optimized. Therefore, abrupt molecular orientation deformation due to voltage application can be reflected in the 3 ⁇ 4 refraction change of the liquid product, and the aero-optical property of performing a sudden optical change at a threshold value or ⁇ 'can be realized.
  • the transmittance of the polarizing plate is about 90% even when linearly polarized light is incident parallel to the polarization axis, and the conventional configuration using two polarizing plates is used.
  • the conventional configuration using two polarizing plates is used.
  • a backlight is not used, and since the incident light passes through the light plate a total of four times before being emitted, attenuation of the light amount becomes a problem.
  • An object of the present invention is to provide a reflective liquid crystal display element having a high reflectivity and capable of providing a good contrast display.
  • a first aspect of the present invention includes a liquid product cell in which a layer of a liquid material is inserted into a pair of transparent substrates having electrodes, a polarizing plate, a reflective plate, and an optically anisotropic body having a twisted structure.
  • the polarizing plate is disposed on one surface side of the liquid crystal material layer,
  • the reflector is disposed on the other surface side of the liquid crystal material layer,
  • the optically anisotropic body is disposed between the polarizing plate and the reflecting plate,
  • the present invention relates to a reflection type liquid crystal display device characterized by being a norm.
  • 2 of the present invention is that the birefringent wave ⁇ of the liquid material ⁇ and the wavelength refraction dispersion 2 of the optical cube are
  • the present invention relates to the reflective liquid crystal display element according to the first aspect of the present invention, wherein A third aspect of the present invention is that the birefringence wave dispersion of the liquid crystal material dust and the birefringence wavelength dispersion 2 of the optical cube are:
  • the fourth aspect of the present invention relates to a reflective liquid crystal display device according to the second aspect of the present invention (a fourth aspect of the present invention is a liquid crystal material layer in which a liquid crystal material layer has a twist of liquid crystal material molecules from a polarizing plate side to a reflector side).
  • a fifth aspect of the present invention relates to the reflective liquid crystal display device according to any one of the first to fourth aspects of the present invention, wherein the optically anisotropic material is formed of a liquid crystal film.
  • a sixth aspect of the present invention is the reflective liquid crystal display device according to any one of the first to fifth aspects of the present invention, further comprising at least one light diffusion layer between the polarizing plate and the reflecting plate.
  • the reflective liquid crystal display element of the present invention includes a liquid crystal cell, a polarizing plate, a reflecting plate, and an optically anisotropic body.
  • the liquid crystal cell has a pair of transparent substrates provided with electrodes and a liquid crystal material layer inserted between the transparent substrates.
  • a substrate that aligns the liquid crystal substance in a specific alignment direction can be used.
  • a transparent substrate in which the transparent substrate itself has the property of orienting the liquid crystal material or a transparent substrate provided with a directing film or the like having the property of orienting the liquid crystal material can be used.
  • the electrode of the liquid crystal cell can be usually provided on the surface of the transparent substrate where the layer of the liquid crystal material is in contact.
  • a transparent substrate having an alignment film it is provided between the transparent substrate and the alignment film. be able to.
  • the liquid crystal material include various kinds of liquids generally used for STN type liquid crystal display devices.
  • the refractive index anisotropy ⁇ n of the liquid material used in the liquid crystal cell generally depends on the wavelength (nm), and the characteristic generally has a negative tendency with respect to the wavelength. .
  • ⁇ , ⁇ ⁇ , (45 0) / ⁇ ⁇ , (59 0)
  • liquid crystal materials are exactly the same, they may be the same for different liquid crystal materials.
  • a voltage value of two or more is selected, and a driving voltage is applied to the liquid crystal material layer.
  • the two or more voltage values are not particularly limited as long as they are effective voltage values for performing a liquid crystal display, and may be voltage values before and after a sharp change in reflectance occurs.
  • the layer of the liquid crystal material can function as an active optical layer that provides a display of a bright achromatic color and a dark L ⁇ achromatic color.
  • the polarizing plate is disposed on one side of the liquid crystal material layer.
  • the liquid crystal cell is arranged on one of the front surface and the back surface, in other words, on the surface of the transparent substrate which is not on the liquid material layer interface side of one of the transparent substrates.
  • a polarizing plate can be provided between the transparent substrate and the liquid crystal material layer, that is, in the liquid crystal cell.
  • the polarizing plate may be provided via an optically anisotropic body or the like.
  • the ft light plate used in the present invention is not particularly limited, and various general ones having an absorption axis can be used.
  • a polarizing plate having a high transmittance in order to obtain a reflective liquid crystal display device having a high reflectance, it is preferable to use a polarizing plate having a high transmittance.
  • a uniaxially stretched polyvinyl alcohol film (PVA) is formed by arranging iodine molecules with a high degree of polarization in a certain direction. Those sandwiched between films can be used as polarizing plates with high transmittance.
  • the reflector is normally installed in the liquid cell, which is the opposite of the light plate described above.
  • the reflector when a polarizing plate is arranged on the front side of the liquid product cell, the reflector is When the polarizing plate is arranged on the back side of the liquid crystal cell, the reflecting plate is arranged on the front side.
  • This reflector can be installed in a liquid crystal cell as in the case of the above-mentioned polarizing plate, but even in this case, the transparent substrate adjacent to the reflector is a transparent substrate facing the transparent substrate adjacent to the polarizing plate. is there.
  • the reflection plate when the reflection plate is provided in the liquid crystal cell, the reflection plate can also function as an electrode of the liquid crystal cell.
  • optically anisotropic body means an optically anisotropic axis having a structure in which the optically anisotropic axis is twisted from one surface to the other surface. Therefore, the optically anisotropic material referred to here is equivalent to the one obtained by joining a plurality of optically anisotropic layers with a multilayer IB so that the optically anisotropic axes of the layers are continuously swept. It has characteristics and has a large torsion angle in the same way as a normal TN liquid product cell.
  • a twist-aligned liquid crystal cell itself a liquid crystal film, or a laminate of a retardation film can be used.
  • liquid product films are preferred.
  • a liquid crystal material layer inserted between two transparent substrates is oriented in a specific direction as in the above-described driving liquid crystal cell.
  • a liquid crystal cell having a twist angle can be exemplified.
  • the liquid crystal film used for the optically anisotropic body means a film having a structure in which a layer having an optically anisotropic axis is continuously twisted in one film.
  • This liquid crystal film can be generally obtained by forming a liquid crystalline substance having a twist characteristic into a film.
  • the liquid crystalline substance having a twisting characteristic is, for example, an optically positive one regardless of the shape of the liquid product molecule, such as a rod shape or the like, or a small molecule or a polymer. Either a liquid compound or a liquid grade compound that can exhibit extractability can be used.
  • high-molecular liquid crystals that serve as units that induce torsion such as polyesters, polyamides, polycarbonates, and polyesters that exhibit liquid crystallinity
  • a main-chain type polymer liquid crystal such as ester imide or a side-chain type polymer liquid crystal such as polyacrylate, polymethacrylate, polymalonate, or polysiloxane.
  • polyester is preferable because of its ease of synthesis, orientation, and glass transition point.
  • the units that induce torsion are optically active 2-methyl-1,4-butanediol, 2,4-pentenediol, 1,2-propanediol, 2-chloro-1,4-butanediol, and 2-fluoro- 1,4-butanediol, 2-bromo_1,4-butanediol, 2-ethyl-1,4-butanediol or 2-propyl-1,4-butanediol or derivatives thereof (for example, diacetoxy compounds, etc.) Derivatives) can be used.
  • the above diols may be either R-form or S-form, or may be a mixture of R-form and S-form.
  • the liquid product film referred to in the present invention does not matter whether or not the film breaks the liquid property.
  • the liquid crystal film referred to in the present invention is generally formed by fixing an alignment state formed by a liquid material as described above in a liquid crystal state, for example, by a method such as an optical method, a heat method, or a cooling method. Obtainable.
  • a retardation film is formed by dispersing a plurality of transparent plastic films typified by polycarbonate and polymethacrylate with good viscosity, and displacing a plurality of films by slightly shifting their optical axes. It can be created by multiplying by a twist angle.
  • the optical anisotropic body of the present invention has a temperature compensation effect in which the product (A n 2 ⁇ d 2 ) of the refractive index anisotropy ⁇ n 2 and the thickness d 2 of the optical anisotropic body changes with temperature. Is preferred.
  • Refractive index anisotropy at wavelengths of 450 nm and 590 nm of optically anisotropic bodies (hereinafter referred to as “ ⁇ 2 (450)”, “ ⁇ 2 (590)”)
  • the ratio of) is represented by the birefringence wavelength dispersion 2 ,
  • the liquid 2 is the same if the liquid material is exactly the same.
  • the force may be the same even with different liquid crystal materials.
  • the optical cube of the present invention l! Lj is diffracted by a polarizing plate disposed on one side of the driving river liquid crystal cell and a reflecting plate disposed on the other side. Usually, it is arranged on either one of the position between the polarizing plate and the liquid product cell or between the liquid product cell and the reflection plate. However, it is particularly preferable to provide the device between the polarizing plate and the liquid product cell.
  • light diffusion debris can be provided on the il'.J of the iw light plate and the reflector.
  • Type liquid crystal display can be obtained.
  • the light-scattering debris mentioned here means having a property of diffusing incident light isotropically or anisotropically, and any material may be used.
  • the light diffusion may be made of plastic sheet, plastic film, plastic substrate, plastic substrate, A-type other than plastic, etc., which exhibit spreading property.
  • Non-self-supporting sheets or films in which particles having different refractive indices are dispersed may be used. Sheets, films, substrates, etc., may or may not have IT self-supporting properties. If it does not have self-supporting properties, it should be held on a self-supporting film or transparent board by some means, and the light-spreading property should not be reduced as a whole.
  • a compound or a compound capable of forming light m is deposited on the optically anisotropic body by means of a melt or solution, and if necessary, ',' 3 ⁇ 4, magnetism, light irradiation, etc.
  • the light spreading ⁇ may be formed by performing some kind of processing. However, light may not be It is necessary to perform the process so that the film strength of the anisotropic film does not decrease.
  • the light diffusion layer having adhesive properties includes acrylic adhesive, rubber adhesive, silicone adhesive, ethylene-vinyl acetate copolymer adhesive, urethane adhesive, vinyl ether adhesive, and polyvinyl alcohol.
  • Organic particles such as polystyrene-based fine particles and polymethacrylic acid-based fine particles having an average particle size of 0.5 to 5 ⁇ m are formed on a matrix composed of a pressure-sensitive adhesive, a polyacrylamide-based pressure-sensitive adhesive, and a mixed pressure-sensitive adhesive thereof.
  • Silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide, etc. are exemplified.
  • acrylic pressure-sensitive adhesives are desirable as a matrix because of their excellent transparency, weather resistance, heat resistance, and the like.
  • the individual viscous light diffusing layers may be of the same type or of a different kind.
  • any of known materials can be used.
  • the light-diffusing layer having an adhesive property may be, for example, a petroleum resin, a rosin resin, a terpene resin, a synthetic petroleum resin, a phenolic resin, a xylene resin, or a resin as long as the effects of the present invention are not impaired.
  • Tackifiers such as aliphatic petroleum resins, coumarone indene resins, styrene resins, dicyclopentene resins, etc .; Add 1 'of other appropriate additives such as decay, anti-aging agent, cross-linking, etc. Can be
  • Examples of the light diffusion layer having no viscosity include a plastic sheet, a film, and a substrate in which particles having a refractive index different from that of the matrix are dispersed in a resin matrix.
  • Such dispersed plastic film substrate can ⁇ Geru.
  • the thickness of the light diffusion layer is not particularly limited, but is usually 10 1m or less ”: 500 Aim or less.
  • the ⁇ ) t-line transmittance of the light diffusion layer is preferably 50% or more, and particularly preferably 0% or more. Further, the diffusion transmittance of the light diffusion is usually 5 to 99%, preferably 50 to 99%.
  • the light passes through the fci light plate and enters, passes through the optical anisotropic plate and the liquid product, is further reflected by the reflector, and is reflected by the optical plate and the liquid crystal material.
  • ⁇ Pass in the opposite direction, and further pass through the polarizing plate to be emitted.
  • the twist angle of liquid material substance molecules from the polarizing plate side to the reflection plate side in the liquid crystal material layer in the liquid crystal cell ⁇ , ⁇ , + 200 ° to + 270 ° ° Marauders.
  • the product (An ⁇ d,) force of the refractive index anisotropy ⁇ of the liquid crystal material K ⁇ and the thickness d in the liquid product cell is 700 nm to 100 nm. It is in the nm range. If it is less than 700 nm, the change in the state of the liquid crystal when a voltage is applied is small, and if it exceeds 100 nm, the viewing angle characteristics and responsiveness deteriorate.
  • the twist angle 0 2 of the slow axis of the optical W parallelepiped from the polarizing plate side to the reflecting plate side is in the range of ⁇ 155 ° to 122 °. is there. ( ⁇ 2 ⁇ d 2 ) between the refractive index anisotropy ⁇ 2 of the optically anisotropic layer and the thickness d 2 of the optically anisotropic body is in the range of 550 nm to 850 nm.
  • the liquid product indicator in this section 1 shows that the refraction wave of the material substance ⁇ 1 and the diffraction wavelength of the
  • the refraction wave dispersion of the liquid crystal material layer and the birefringence wavelength dispersion of the optical cube are calculated as follows.
  • degree 6> means that the field r where the light '/ ⁇ ⁇ Jj body is located between the light plate and the liquid,', ⁇ ', substance r is the 0I river between +90 and + 130 ° It is more preferable that the case where the optical body is in question between the liquid material layer and the reflector is in the range of 0 to 140 °.
  • 1 is a polarizing plate
  • 2 is an optical device
  • 3 is a liquid material (; a transparent substrate having a pole).
  • 4 is shooting fe (), and 6 is external light.
  • the orientation of the liquid, and the object on the ⁇ ' ⁇ of the polarizer 1 ⁇ ( ⁇ 31 and the surface of the reflector 4 l l [nj Jj Ir.
  • the absorption axis 11 of the polarizing plate 1 and the slow axis direction 2 1 of the optically anisotropic body 2 on the surface of the polarizing plate 1 side form an angle 0 3
  • the absorption axis 1 1 of the polarizing plate 1 And the orientation direction 3 1 on the polarizing plate 1 side of the liquid material layer 3 A is 1 ° 0.
  • ⁇ represents In the reflection-type liquid crystal display device of the present invention, the force that rotates counterclockwise from the polarizing plate toward the reflecting plate, that is, rotates in the same direction relatively [ ⁇ ],
  • the direction of rotation of 0, is always opposite to 0 2 .
  • the reflective liquid crystal display of the present invention includes a liquid product cell, an optical plate, a reflective plate, and the optically anisotropic layer as essential components, and also includes a light diffusion layer as required.
  • other components may be provided. More specifically, for example, by further adding a color filter, a multi-color liquid crystal display device having a high color purity can be a full-reflection liquid crystal display device capable of full color display.
  • FIG. 3 An STN-type reflective liquid crystal display device schematically shown in FIG. 3 was created.
  • the liquid product cell 3 has a pair of opposing transparent substrates 3C, electrodes 3B provided on the inner surfaces thereof, and is printed and formed thereon, and subjected to an alignment treatment.
  • an alignment film 3E An alignment film 3E.
  • a liquid crystal substance is sealed in a space defined by the alignment film 3E and the sealant 3D formed by printing and forming around the transparent substrate, thereby forming a liquid crystal layer 3A.
  • ZLI- 5 04 9 as liquid crystal materials, a more liquid crystal layer 3 A in regulating the alignment treatment direction of the alignment film 3 E is oriented in a predetermined direction, is twisted 6> 1 D + 2 5 0 ° Was.
  • the product nd of the refractive index anisotropy ⁇ ⁇ of the liquid crystal material in the liquid crystal cell 3 at a wavelength of 550 nm and the thickness d of the liquid crystal layer 3A was approximately 790 nm.
  • the polarizing plate 1 was disposed on the liquid surface of the liquid product cell 3 (upper side of the figure), and the reflector 4 was disposed on the back side of the liquid crystal cell 3 (lower side of the figure).
  • FIG. 5 is a diagram illustrating spectral characteristics when the electric field is turned on and when the electric field is turned off. Further, the contrast when driven at 1/100 duty and the appropriate bias, and the luminous reflectance (Y value) when the eleventh field is on were determined. The results are shown in Table 1.
  • FIG. 9 is a diagram illustrating spectral characteristics when the electric field is on and when the electric field is off. In addition, the contrast when driving at 1/100 duty and the optimum bias and the luminous reflectance ( ⁇ ) when the electric field is turned on were determined. Table 2 shows the results.
  • the reflection type liquid crystal display device f! Of the present invention can be used as the reflection type liquid crystal display device of Comparative Examples 1 and 2. It can be seen that the contrast is significantly improved as compared with the display device.
  • Reflective color liquid product display including the color filter 7 shown schematically in Figure 13
  • the device was created. 13 which are the same as those of the apparatus shown in FIG. 3 are denoted by the same reference numerals.
  • the color filter including the three colors of red, green, and blue is different between the transparent substrate 3 C and the transparent electrode 3 B on the display surface side in the liquid crystal cell 3.
  • FIG. 1 is a schematic diagram illustrating the position and angle relationship of each component in the liquid crystal display device of the present invention.
  • FIG. 2 is a plan view illustrating the relationship between the absorption angle of the polarizer in the liquid crystal display device of the present invention, the orientation direction of the liquid crystal material layer, and the slow sleeve direction of the optical cube.
  • FIG. 3 shows the implementation of the first embodiment
  • FIG. 4 shows a change in reflectance with respect to a change in drive voltage of the device of the first embodiment.
  • FIG. 5 shows the spectral characteristics of the device of Embodiment 1 when the field is on and the electric field is off.
  • FIG. 6 shows the spectral characteristics of the device iS of Embodiment I when the electric field is on and when the electric field is off.
  • FIG. 7 shows the spectral characteristics of the device of Comparative Example I 1 when the electric field is on and when the electric field is off.
  • FIG. 8 shows a change in the reflectance with respect to a change in the drive voltage of the pier 3.
  • FIG. 9 shows the spectral characteristics of the device of Example 3 when the field is on and when the field is off.
  • FIG. 10 shows the spectral characteristics of the device of Example 4 when the electric field is on and when the electric field is off.
  • FIG. 11 shows the spectral characteristics of the device of Example 5 when the electric field is on and the W is off.
  • C shows the spectral characteristics of the device of Comparative Example 2 when the electric field is on and when the electric field is off.
  • FIG. 13 is a vertical section ⁇ schematically showing the device of the first embodiment.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un élément graphique à cristaux liquides en réflexion qui comprend une cellule à cristaux liquides présentant une couche de substance à cristaux liquides insérée entre une paire de substrats transparents doublant comme des électrodes, une plaque de polarisation, une plaque de réflexion, et un élément à anisotrope optique présentant une structure torsadée, une valeur de tension avec au moins une bivalence choisie de façon à appliquer une tension de commande à la couche de substance à cristaux liquides. La plaque de polarisation est disposée sur un côté superficiel de la couche de substance à cristaux liquides. La plaque de réflexion est disposée sur l'autre côté superficiel de la couche de substance à cristaux liquides. L'élément à anisotrope optique est disposée entre la plaque de polarisation et la plaque de réflexion. Lorsqu'un rapport entre des anisotropies d'indice de réfraction Δn à une longueur d'onde de μ=450 nm et μ=590 nm est défini comme une dispersion en longueur d'onde biréfrigérante α=Δn (450)/Δn (590), la dispersion en longueur d'onde biréfrigérante α1 de la couche de substance à cristaux liquides et la dispersion en longueur d'onde biréfrigérante α2 de l'élément à anisotrope optique se situent dans les plages α1=1,01 à 1,35 et α2=1,11 à 1,40. On obtient ainsi un élément graphique à cristaux liquides en réflexion présentant un facteur de réflexion élevé et un excellent contraste.
PCT/JP2001/000708 2000-02-07 2001-02-01 Element graphique a cristaux liquides en reflexion WO2001059513A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000-29512 2000-02-07
JP2000029512A JP2001222006A (ja) 2000-02-07 2000-02-07 反射型液晶表示素子
JP2000036720A JP2001228328A (ja) 2000-02-15 2000-02-15 反射型液晶表示素子
JP2000-36720 2000-02-15

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WO2001059513A1 true WO2001059513A1 (fr) 2001-08-16

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0320283A2 (fr) * 1987-12-10 1989-06-14 Seiko Epson Corporation Dispositif électro-optique
JPH0412322A (ja) * 1990-04-28 1992-01-16 Ricoh Co Ltd 光学位相板とその製造方法及びその光学位相板を用いた液晶表示素子
EP0907096A2 (fr) * 1997-09-29 1999-04-07 Matsushita Electric Industrial Co., Ltd. Affichage à cristaux liquides en couleur fonctionnant en mode réfléchissant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0320283A2 (fr) * 1987-12-10 1989-06-14 Seiko Epson Corporation Dispositif électro-optique
JPH0412322A (ja) * 1990-04-28 1992-01-16 Ricoh Co Ltd 光学位相板とその製造方法及びその光学位相板を用いた液晶表示素子
EP0907096A2 (fr) * 1997-09-29 1999-04-07 Matsushita Electric Industrial Co., Ltd. Affichage à cristaux liquides en couleur fonctionnant en mode réfléchissant

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