WO2001022155A1 - Afficheur reflectif a cristaux liquides - Google Patents

Afficheur reflectif a cristaux liquides Download PDF

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Publication number
WO2001022155A1
WO2001022155A1 PCT/JP2000/006231 JP0006231W WO0122155A1 WO 2001022155 A1 WO2001022155 A1 WO 2001022155A1 JP 0006231 W JP0006231 W JP 0006231W WO 0122155 A1 WO0122155 A1 WO 0122155A1
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WIPO (PCT)
Prior art keywords
liquid crystal
polarizing plate
optically anisotropic
crystal display
layer
Prior art date
Application number
PCT/JP2000/006231
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English (en)
Japanese (ja)
Inventor
Takehiro Toyooka
Tetsuya Uesaka
Original Assignee
Nippon Mitsubishi Oil Corporation
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Publication of WO2001022155A1 publication Critical patent/WO2001022155A1/fr

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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
    • G02F1/133636—Birefringent elements, e.g. for optical compensation with twisted orientation, e.g. comprising helically oriented LC-molecules or a plurality of twisted birefringent sublayers
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1396—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
    • G02F1/1397—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell the twist being substantially higher than 90°, e.g. STN-, SBE-, OMI-LC 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
    • G02F2202/00—Materials and properties
    • G02F2202/40—Materials having a particular birefringence, retardation
    • 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

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.
  • liquid crystal display devices In recent years, the application of liquid crystal display devices has expanded from calculators to portable processors and personal computer displays due to the remarkable improvement in display performance due to the progress of liquid crystal display technology. In addition, there is an increasing expectation that the market for dogs will expand as a display for portable information terminal equipment, making full use of the thin and lightweight features of liquid crystal display devices. For portable applications, it is usually battery-powered, so reducing power consumption is an important issue. For this reason, as a liquid crystal display device for portable use, a reflection type liquid crystal display device, which does not require a backlight that consumes a large amount of power and can be reduced in power consumption, thinned, and lightened, is particularly attracting attention. ing.
  • the 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 reflective plate is further disposed outside the liquid crystal cell 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 alignment deformation due to voltage application can be reflected in the birefringence change of the liquid crystal, and an electro-optical characteristic exhibiting a sudden optical change above a threshold can be realized.
  • the display background color and Yellow green or dark blue may occur.
  • a liquid crystal cell for optical compensation or a retardation plate formed of a polymer such as polycarbonate or a twisted retardation film is superimposed on the STN liquid crystal cell for display.
  • a liquid crystal display device configured to perform color compensation and perform a display similar to a monochrome display is used as a so-called paper white liquid crystal display device.
  • 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.
  • a backlight is not used and the incident light passes through a polarizing plate a total of four times before being emitted, so that attenuation of the light amount becomes a problem.
  • a conventional technique for solving this problem there is a technique described in Japanese Patent Application Laid-Open No. Hei 2-18959 or Japanese Patent Application Laid-Open No. Hei 6-11711.
  • These include a configuration in which a polarizing plate, a retardation plate, a liquid crystal cell, and a reflecting plate are stacked in this order, that is, a polarizing plate on a reflecting plate side from a reflection type liquid crystal display device using a generally used STN type liquid crystal cell.
  • a liquid crystal display device having a configuration excluding is disclosed.
  • 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 liquid crystal cell in which a layer of a liquid crystal substance is inserted between a pair of transparent substrates having electrodes, a polarizing plate, a reflecting plate, and an optically anisotropic body, and a voltage value of two or more values is provided.
  • the reflector is disposed on the other surface of the layer of the liquid crystal material,
  • the optically anisotropic body is disposed between the polarizing plate and the reflecting plate,
  • the twist angle 0 2 of the slow axis of the optically anisotropic body from the polarizing plate side to the reflecting plate side is — 1 5 5
  • the product ( ⁇ 1 ⁇ d 1) of the refractive index anisotropy ⁇ 1 and the thickness d 1 of the liquid crystal material layer is 700 nm to 100 nm.
  • the product of the refractive index anisotropy ⁇ 2 of the optically anisotropic material and the thickness d2 (A n 2 ⁇ d 2) is in the range of 550 nm to 850 nm.
  • 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 having the property of orienting the liquid crystal substance itself or a transparent substrate provided with a directing film or the like having a property of orienting the liquid crystal substance 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 substance various substances usually used for an STN type liquid crystal display element can be used.
  • a voltage value of two or more is selected, and a driving voltage is applied to the liquid crystal material layer.
  • the voltage value of the above two values is the liquid crystal table
  • the voltage value is not particularly limited as long as it is an effective voltage value for performing the display, and may be a voltage value 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 bright achromatic color and achromatic color display.
  • 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 transparent substrate surface which is not the liquid crystal material layer interface side of one transparent substrate.
  • a polarizing plate can be arranged between the transparent substrate and the liquid crystal material layer, that is, in the liquid crystal cell.
  • the polarizing plate can be provided via an optically anisotropic body or the like.
  • the polarizing plate used in the present invention is not particularly limited, and various general polarizing plates having an absorption axis can be used. However, 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.
  • other support materials include uniaxially stretched polyvinyl alcohol film (PVA), a halogen polarizing film made by arranging iodine molecules with a high degree of polarization in a certain direction, and a polyvinyl alcohol film dyed with a direct dye. What is sandwiched between films can be used as a polarizing plate with high transmittance.
  • the reflector is usually installed on the surface of the liquid crystal cell opposite to the side where the above-mentioned polarizing plate is installed.
  • the polarizing plate is arranged on the front side of the liquid crystal cell
  • the reflecting plate is arranged on the back side of the liquid crystal cell.
  • the polarizing plate is arranged on the back side of the liquid crystal cell
  • the reflecting plate is arranged on the front side.
  • a reflector is arranged. 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 can also function as an electrode of the liquid crystal cell.
  • Aluminum foil, silver foil, etc. can be used for the reflector, and an aluminum layer or silver layer is vacuum-deposited on a clear glass transparent substrate by vacuum deposition to form a reflector. You can also.
  • the term "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 has the same characteristics as those obtained by superposing a plurality of optically anisotropic layers in such a way that their optically anisotropic axes are continuously swirled. And has a torsion angle like a normal TN liquid crystal cell or the like.
  • a twist-aligned liquid crystal cell itself a liquid crystal film, or a laminate of a retardation film can be used.
  • a liquid crystal film is preferable.
  • a layer of a liquid crystal substance inserted between two transparent substrates is oriented in a specific direction, similarly to the driving liquid crystal cell described above.
  • An example is a liquid crystal cell having a twist angle.
  • 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 crystal material having a twisting property has, for example, a liquid crystal molecule shape such as a rod shape or the like, and an optically positive uniaxial property irrespective of whether it is a small molecule or a polymer. Any liquid crystalline compound or liquid crystalline composition that can be used can be used.
  • a polymer liquid crystal having a unit that induces torsion for example, a main-chain polymer liquid crystal such as polyester, polyamide, polycarbonate, or polyesterimide that exhibits liquid crystallinity, polyacrylate, polymethacrylate, or polymalonate
  • a side chain type polymer liquid crystal such as polysiloxane
  • polyester is preferable because of its ease of synthesis, orientation, and glass transition point.
  • the units that induce twisting include optically active 2-methyl-1,4-butanediol, 2,4-pentendiol, 1,2-propanediol, 2-chloro-1,4-butanediol, 2-fluoro-1,4-butanediol, 2-bromo-1,4-butanediol, 2-ethyl-1,4-butanediol or 2-propane Units derived from rou 1,4-butanediol or derivatives thereof (eg, derivatives such as diacetoxy compounds) can be used.
  • the above-mentioned diols may be either R-form or S-form, or may be a mixture of R-form and S-form.
  • the liquid crystal film referred to in the present invention does not matter whether the film itself exhibits liquid crystallinity.
  • the liquid crystal film referred to in the present invention can be usually obtained by fixing the alignment state formed by the liquid crystalline substance in a liquid crystal state as described above, for example, by a method such as photocrosslinking, thermal crosslinking, or cooling. .
  • a retardation film is formed by precisely uniaxially stretching a transparent plastic film typified by polycarbonate or polymethacrylate.A plurality of films are formed. It can be made by laminating so that 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 An 2 and the thickness d 2 of the optical anisotropic body changes with temperature. Is preferred. This is because even if the ambient temperature changes, the color development does not fluctuate, and it is possible to provide a reflective liquid crystal display element capable of displaying good black and white.
  • the change due to the temperature of An 2 ⁇ d 2 is caused by the product (A n 1) of the refractive index anisotropy ⁇ 1 of the liquid crystal material layer and the thickness d 1 in the liquid crystal cell used for driving. ⁇ It is desirable that d1) is almost equal to the change due to temperature.
  • the optical anisotropic material used in the present invention preferably has a different optical anisotropy dispersion depending on the wavelength. This is because a reflective black-and-white display device with further improved achromatic color can be provided.
  • the optically anisotropic body of the present invention is disposed between a polarizing plate disposed on one side of the driving liquid crystal cell and a reflector disposed on the other side. Usually, it is disposed between the polarizing plate and the liquid crystal cell or between the liquid crystal cell and the reflecting plate. However, it is particularly preferable that the liquid crystal cell is provided between the polarizing plate and the liquid crystal cell. In the reflection type liquid crystal display device of the present invention, a light diffusion layer is further provided between the polarizing plate and the reflection plate.
  • the light diffusion layer here means a layer having a property of diffusing incident light isotropically or anisotropically, and its material is not limited.
  • the light diffusion layer may be formed from a plastic sheet, a plastic film, a plastic substrate, a substrate other than plastic, or the like, which exhibits light diffusivity, and has a refractive index different from that of the matrix in an adhesive matrix. It may be a sheet-like material or a film-like material having no self-supporting property, in which particles having the same are dispersed. Sheets, films, substrates, etc. may be self-supporting or non-self-supporting. If it does not have self-supporting properties, it may be held on a self-supporting film or a transparent substrate by some means, so long as the light diffusion properties are not impaired as a whole.
  • a compound or composition capable of forming a light diffusion layer is applied on the optically anisotropic body by means such as melt coating or solution coating, and if necessary, some processing such as electric field, magnetic field, or polarized light irradiation is performed. Then, a light diffusion layer may be formed. However, it is necessary to perform the melting and solution coating so that the film strength of the optically anisotropic film does not decrease.
  • the light-diffusing layer having adhesive properties includes an acrylic adhesive, a rubber adhesive, a silicone adhesive, an ethylene-vinyl acetate copolymer adhesive, a urethane adhesive, a vinyl ether adhesive, and a polyvinyl alcohol.
  • Organic adhesives such as polystyrene-based fine particles having an average particle size of 0.5 to 5 m, polymethacrylic acid-based fine particles, etc.
  • Dispersed materials such as silica, alumina, titania, zirconium, tin oxide, indium oxide, cadmium oxide, antimony oxide, inorganic fine particles, hollow fine particles containing gas, and microcapsules containing liquid are dispersed. Is exemplified.
  • acrylic adhesives are desirable as a matrix because they have excellent transparency, weather resistance, heat resistance, and the like.
  • the individual adhesive light diffusing layers can be of the same type or different types in an appropriate combination.
  • any of known materials can be used.
  • Adhesives mainly composed of acrylic polymers using one or two or more acrylic acid-based alkyl esters composed of esters of acrylic acid / methacrylic acid having a linear or branched alkyl group are exemplified.
  • 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 an alicyclic ring as long as the effects of the present invention are not impaired.
  • Tackifiers such as aliphatic petroleum resin, coumarone indene resin, styrene resin, dicyclopentene resin, etc., softeners such as phthalate ester, phosphate ester, paraffin chloride, polybutene, polyisobutylene or other various fillings
  • An appropriate additive such as an agent, an antioxidant, a cross-linking agent and the like can be blended.
  • Examples of the light diffusion layer having no tackiness include plastic sheets, films, and substrates in which particles having a refractive index different from that of matrix are dispersed in a resin matrix.
  • the thickness of the light diffusion layer is not particularly limited, it is usually 10 m to 500 m. Further, the total light transmittance of the light diffusion layer is preferably 50% or more, and particularly preferably 70% or more. Further, the diffusion transmittance of the light diffusion layer is usually 5 to 99%, preferably 50 to 99%.
  • the reflection type liquid crystal display device of the present invention In the reflection type liquid crystal display device of the present invention, light enters through the polarizing plate, passes through the optically anisotropic material and the liquid crystal material layer, is further reflected by the reflecting plate, and is reflected by the optically anisotropic material and the liquid crystal material layer. In the opposite direction, and further exit through the polarizing plate.
  • the twist angle of the liquid crystal material molecules from the polarizing plate side to the reflecting plate side in the liquid crystal material layer in the liquid crystal cell is +200. It is in the range of ⁇ 270 °.
  • the torsion angle When the torsion angle is less than + 200 °, there is little change in the liquid crystal state when time-division driving is performed at a high duty ratio that requires a steep transmittance change. If it exceeds + 270 °, hysteresis tends to occur.
  • the positive and negative directions of the angle mean the rotational direction of the relative angle, and the clockwise direction when the counterclockwise direction from the polarizing plate toward the reflecting plate is +. Is minus, and conversely, if the clockwise direction is +, the counterclockwise direction is unity. However, either case is within the scope of the present invention, and equivalent effects can be obtained.
  • the product (n 1 ⁇ d 1) of the refractive index anisotropy n 1 and the thickness d 1 of the liquid crystal material layer in the liquid crystal cell is in the range of 700 nm to 1000 nm. . 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 lOOOOnm, the viewing angle characteristics and responsiveness deteriorate.
  • the twist angle S2 of the slow axis of the optically anisotropic body from the polarizing plate side to the reflecting plate side is in the range of -155 ° to -220 °.
  • the product (An 2 ⁇ d 2) of the refractive index anisotropy ⁇ 2 of the optically anisotropic body and the thickness d 2 of the optically anisotropic body is in the range of 550 nm to 850 nm. In this way, good contrast is realized by setting ⁇ ⁇ 2 ⁇ 1 to each value in a specific range, and setting An 1 ⁇ ⁇ d1 and ⁇ 2 ⁇ d2 to values in each specific range. be able to.
  • ⁇ 1 and 2 are restricted to specific ranges.
  • the angle 03 from the absorption axis of the polarizing plate to the slow axis on the polarizing plate side of the optically anisotropic body and the orientation direction from the absorption axis of the polarizing plate to the alignment direction of the liquid crystal material layer on the polarizing plate side It is preferable to adjust each of the angles 04 as follows, since the coloring is small and good contrast can be realized.
  • the angle 04 is in the range of +90 to 10 130 ° when the optically anisotropic body is arranged between the polarizing plate and the liquid crystal material layer. More preferably, when the optically anisotropic material is disposed between the liquid crystal material layer and the reflector, the angle is more preferably in the range of 0 to 1040 °.
  • FIG. 1 1 is a polarizing plate
  • 2 is an optically anisotropic body
  • 3A is a liquid crystal material layer (illustration of a transparent substrate having electrodes. Is omitted)
  • 4 is a reflector (layer)
  • 6 is external light.
  • the orientation direction 31 of the liquid crystal material layer 3A on the surface of the polarizing plate 1 and the orientation direction 32 of the liquid crystal material layer 3A on the surface of the reflecting plate 4 form an angle 01.
  • the direction 21 of the slow axis of the optically anisotropic body 2 on the surface on the side of the polarizing plate 1 and the direction 22 of the slow axis on the surface of the side of the reflecting plate 4 form an angle 2.
  • the absorption axis 11 of the polarizing plate 1 and the direction 2 1 of the slow axis on the surface of the optically anisotropic body 2 on the polarizing plate 1 side form an angle ⁇ 3
  • the orientation direction 31 on the surface of the liquid crystal material layer 3A on the polarizing plate 1 side forms an angle ⁇ 4.
  • FIG. 2 is a plan view showing the positional relationship when these are superimposed from the polarizing plate side toward the reflecting plate side, using the same symbols.
  • 01 to 04 are all rotated counterclockwise from the polarizing plate to the reflecting plate for convenience of explanation, that is, they are rotated in the same direction relative to each other.
  • the rotation direction of is always opposite to 02.
  • the reflection type liquid crystal display element of the present invention includes a liquid crystal cell, a polarizing plate, a reflection plate, and the optically anisotropic member as essential components, and further includes a light diffusion layer as necessary.
  • other components may be provided. Specifically, for example, color
  • a power-reflection type liquid crystal display element capable of displaying a multi-color or full-color display with high color purity.
  • the reflective liquid crystal display element of the present invention has a high reflectivity because it has a polarizing plate only on one surface side of the liquid crystal material layer (liquid crystal layer) and has a specific liquid crystal cell and an optically anisotropic body.
  • a display with good contrast can be realized, and a much higher display quality can be obtained as compared with a conventional reflective liquid crystal display device.
  • the liquid crystal cell 3 has a pair of transparent substrates 3C facing each other, electrodes 3B provided on the inner surfaces thereof, and printed and formed thereon, and subjected to an alignment process. And 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.
  • An 1 of the liquid crystal material in the liquid crystal cell 3 and the thickness d 1 of the liquid crystal layer 3 A was approximately 880 nm.
  • the polarizing plate 1 is arranged on the display surface side of the liquid crystal cell 3 (upper side in the figure).
  • the reflector 4 was placed on the back side (the lower side of the figure).
  • An optically anisotropic body 2 is arranged between the polarizing plate 1 and the liquid crystal cell 3, and a light diffusing layer IDS—produced by Dainippon Printing Co., Ltd. as the light diffusing layer 5 between the optically anisotropic body 2 and the liquid crystal cell.
  • 2 1 total light transmittance 91.1%, haze 51.6
  • the angle 03 + 20 ° from the absorption axis of the polarizing plate 1 to the slow axis on the polarizing plate side of the optically anisotropic body 2, and the distance from the absorption axis of the polarizing plate 1 to the polarizing plate side of the liquid crystal layer 3 A.
  • FIG. 4 shows the results.
  • FIG. 5 is a diagram showing spectral characteristics when the electric field is on and when the electric field is off.
  • the contrast and the luminous reflectance (Y value) when the electric field was turned on were determined when driving at 1/240 duty and the optimum bias. Table 1 shows the results.
  • ⁇ n 1 ⁇ d 1 is approximately 880 nm
  • An 2 * d 2 is approximately 740 nm
  • ⁇ 1 + 240 °
  • 6> 2 ⁇ 180 °
  • 03 + 20 °
  • 04 + 1
  • a liquid crystal display device similar to that of Example 1 was prepared except that the angle was set to 15 °, and the relationship between the driving voltage and the reflectance, the spectral characteristics when the electric field was turned on and when the electric field was turned off, and the driving at 1/240 duty and the optimum bias were performed.
  • the contrast and the reflectance (Y value) when bright were obtained.
  • the results are shown in Figures 6, 7 and Table 1, respectively.
  • ⁇ 1 ⁇ d 1 is approximately 800 nm
  • ⁇ 2 ⁇ d 2 is approximately 700 nm
  • ⁇ l + 250 °
  • 02 —180 °
  • 03 + 20 °
  • 04 + 115 °
  • the spectral characteristics when the electric field was turned on and when the electric field was turned off, the contrast when driven at 1/240 duty, and the optimum bias, and the reflectance (Y value) when bright were obtained. The results are shown in Figures 8, 9 and Table 1, respectively.
  • ⁇ n 1 -d 1 is approximately 800 nm
  • ⁇ 2 ⁇ d 2 is approximately 660 nm
  • ⁇ 1 + 240 °
  • a liquid crystal display device was prepared in the same manner as in Example 1, the relationship between the drive voltage and the reflectance, and the spectroscopy when the electric field was turned on and when the electric field was turned off.
  • the characteristics, the contrast when driven at 1/240 duty, and the optimum bias, and the reflectance (Y value) when bright were obtained. The results are shown in Figure 10, Figure 11 and Table 1, respectively.
  • ⁇ n 1 ⁇ d 1 is approximately 650 nm
  • ⁇ 2 ⁇ d 2 is approximately 400 nm
  • ⁇ 1 + 240 °
  • 6> 2 —160 °
  • 6.3 + 1 55.
  • a reflective color liquid crystal display device including a color filter 7 as schematically shown in FIG. 14 was created.
  • a color filter 7 including three pixels of red, green, and blue was inserted between the transparent substrate 3C on the display surface side of the liquid crystal cell 3 and the transparent electrode 3B. .
  • 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 an angle relationship between an absorption axis of a polarizing plate, an orientation direction of a layer of a liquid crystal material, and a slow axis direction of an optically anisotropic body in the liquid crystal display device of the present invention.
  • FIG. 3 is an elevational sectional view schematically showing the apparatus of the first embodiment.
  • FIG. 4 is a diagram illustrating a change in reflectance with respect to a change in drive voltage of the device according to the first embodiment.
  • FIG. 5 is a diagram illustrating the device of Example 1 when the electric field is on and when the electric field is off.
  • FIG. 6 is a diagram illustrating a change in reflectance with respect to a change in drive voltage of the device according to the second embodiment.
  • FIG. 7 is a diagram illustrating the device of Example 2 when the electric field is on and when the electric field is off.
  • FIG. 8 is a diagram illustrating a change in reflectance with respect to a change in drive voltage of the device according to the third embodiment.
  • FIG. 9 is a diagram illustrating the device of Example 3 when the electric field is on and when the electric field is off.
  • FIG. 10 is a diagram illustrating a change in the reflectance with respect to a change in the driving voltage of the device of the fourth embodiment.
  • FIG. 11 is a diagram illustrating the device of the fourth embodiment when the electric field is on and when the electric field is off.
  • FIG. 12 is a diagram showing a change in reflectance with respect to a change in drive voltage of the device of the comparative example.
  • FIG. 13 is a diagram illustrating the device of the comparative example when the electric field is on and when the electric field is off.
  • FIG. 14 is an elevational sectional view schematically showing the apparatus of the fifth embodiment.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

Un polariseur (1) est placé d'un côté d'une cellule (3) d'entraînement à cristaux liquides et un réflecteur (4) est placé de l'autre côté. Un corps anisotrope optique (2) est intercalé entre le polariseur (1) et le réflecteur (4). L'angle de torsion (υ1) des molécules du cristal liquide entre le polariseur (1) et le réflecteur (4) dans une couche de cristaux liquides de la cellule (3) à cristaux liquides et l'angle de torsion (υ2) de l'axe de propagation de phase du corps anisotrope optique (2) entre le polariseur (1) et le réflecteur sont maintenus dans des plages respectives spécifiques. Le produit de l'anisotropie de réfraction de la couche de cristaux liquides et son épaisseur ainsi que le produit de l'anisotropie de l'indice de réfraction du corps anisotrope optique (2) et son épaisseur sont maintenus dans des plages spécifiques respectives. On obtient ainsi un afficheur réflectif à cristaux liquides présentant un facteur de réflexion élevé et un bon contraste.
PCT/JP2000/006231 1999-09-17 2000-09-12 Afficheur reflectif a cristaux liquides WO2001022155A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11/262945 1999-09-17
JP26294599A JP3921012B2 (ja) 1999-09-17 1999-09-17 反射型液晶表示素子

Publications (1)

Publication Number Publication Date
WO2001022155A1 true WO2001022155A1 (fr) 2001-03-29

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WO (1) WO2001022155A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114200723A (zh) * 2021-10-29 2022-03-18 华南师范大学 一种无光束横向偏移的液晶可变相位延迟装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003107476A (ja) * 2001-09-28 2003-04-09 Nippon Oil Corp 液晶表示素子

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0990349A (ja) * 1995-09-26 1997-04-04 Asahi Glass Co Ltd 反射型カラー液晶表示装置
JPH10301080A (ja) * 1997-04-23 1998-11-13 Casio Comput Co Ltd 液晶表示装置
JPH11160705A (ja) * 1997-09-22 1999-06-18 Hitachi Ltd 反射型液晶表示装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0990349A (ja) * 1995-09-26 1997-04-04 Asahi Glass Co Ltd 反射型カラー液晶表示装置
JPH10301080A (ja) * 1997-04-23 1998-11-13 Casio Comput Co Ltd 液晶表示装置
JPH11160705A (ja) * 1997-09-22 1999-06-18 Hitachi Ltd 反射型液晶表示装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114200723A (zh) * 2021-10-29 2022-03-18 华南师范大学 一种无光束横向偏移的液晶可变相位延迟装置

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JP3921012B2 (ja) 2007-05-30
JP2001083514A (ja) 2001-03-30

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