WO2006064766A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2006064766A1 WO2006064766A1 PCT/JP2005/022780 JP2005022780W WO2006064766A1 WO 2006064766 A1 WO2006064766 A1 WO 2006064766A1 JP 2005022780 W JP2005022780 W JP 2005022780W WO 2006064766 A1 WO2006064766 A1 WO 2006064766A1
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- optical film
- liquid crystal
- film
- crystal display
- display device
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Classifications
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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
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
-
- 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
-
- 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
-
- 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
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133562—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the viewer side
-
- 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
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133567—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the back side
Definitions
- the present invention relates to a liquid crystal display device on which a laminated optical film is mounted.
- a liquid crystal display device on which a laminated optical film is mounted.
- it is suitably used for a reflective transflective liquid crystal display device that can be mounted on a portable information communication device, a personal computer, or the like.
- the liquid crystal display device is suitable for mounting on a TN (Twisted nematic mode), OCB (Optically compensated bend), or homogeneous mode liquid crystal display device.
- optical film having various polymer materials has been widely used in image display devices such as portable information communication devices, liquid crystal monitors, liquid crystal televisions, and organic EL display devices in order to improve image quality. Yes.
- Such an optical film is produced, for example, by stretching a polymer film having birefringence.
- the direction in which the in-plane refractive index is maximum is the X-axis
- the direction perpendicular to the X-axis is the Y-axis
- the thickness direction of the film is the Z-axis.
- the optical film that controls the Nz coefficient represented by the formula (nx—nz) Z (nx—ny) is used to widen the viewing angle of the image display device such as the liquid crystal display device described above. It is preferably used.
- the suitable Nz coefficient of the optical film varies depending on the mode (TN, VA, OCB, IPS, etc.) of the liquid crystal display device. Therefore, in order to obtain an optical film having a desired Nz coefficient, a polymer material is appropriately selected and used so that the workability of the film is excellent and the birefringence is easily controlled to the desired Nz coefficient. For example, an optical film that satisfies the Nz coefficient ⁇ 0.9 is controlled so that the refractive index is at least nz> ny. Therefore, a polymer material that exhibits such a refractive index and exhibits birefringence is preferably used. .
- An optical film satisfying the Nz coefficient ⁇ 0.9 is advantageous in that it exhibits excellent birefringence.
- a unit of 2,2-bis (4-hydroxyphenol) propane is used as a polymer film. It can be obtained by stretching a polycarbonate resin film containing benzene (see Patent Document 1).
- the polycarbonate resin has high transparency and moderate heat resistance. This is also suitable.
- an optical film obtained by stretching a polycarbonate resin film has a large rate of change in birefringence when stressed, that is, has a large photoelastic coefficient. For this reason, for example, when the optical film is bonded to a polarizing plate, there is a problem that the unevenness is large.
- the stress exerted on the panels has increased, and an optical film material having a smaller retardation change rate (birefringence change rate) has been demanded. Yes.
- the optical film has problems such as a large change in phase difference in a use environment after being bonded to a display device.
- the optical film is unsuitable for applications requiring high heat resistance and high temperature and humidity resistance in recent years.
- a reflective transflective liquid crystal display device or the like has a broadband retardation plate that functions as a ⁇ ⁇ 4 plate or a ⁇ ⁇ 2 plate for incident light (visible light region) having a broadband wavelength region. Suitable for use
- Patent Document 1 Japanese Patent Laid-Open No. 5-157911
- Patent Document 2 JP 2000-56131 A
- Patent Document 3 Japanese Patent Laid-Open No. 5-100114
- Patent Document 4 Japanese Patent Laid-Open No. 10-68816
- Patent Document 5 JP-A-10-90521
- the inventors of the present invention have made extensive studies to solve the above problems, and found that the above object can be achieved by a liquid crystal display device using the following laminated optical films on both sides of a liquid crystal cell.
- the present invention has been completed.
- the present invention is an optical film obtained by stretching a polymer film containing a polycarbonate-based resin and a styrene-based resin,
- the optical film, photoelastic coefficient 2. an OX 10- u ⁇ 6.
- OX 10- u m 2 ZN, and X-axis the direction in which the refractive index is maximized in the film plane, perpendicular to the X axis Is the Y axis, the thickness direction of the film is the Z axis, and the refractive index in each axial direction is nx, ny, nz, and the film thickness
- Nz coefficient force Nz ⁇ 0.9, expressed as Nz (nx nz) / (nx nv),
- the three-dimensional refractive index is controlled to satisfy the optical film (1),
- the direction in which the in-plane refractive index is maximum is the X-axis
- the direction perpendicular to the X-axis is the Y-axis
- the film thickness direction is the Z-axis
- the refractive indexes in the respective axial directions are nx, ny, and nz.
- a laminated optical film in which an optical film (3) formed of a material exhibiting optically negative uniaxial properties and including a portion where the material is tilted is laminated.
- the present invention relates to a liquid crystal display device which is mounted on both sides of a liquid crystal cell together with a polarizing plate.
- the laminated optical film used in the liquid crystal display device of the present invention includes an optical film (1) having a controlled three-dimensional refractive index, an optical film (2) exhibiting optically positive uniaxiality, and an optical film. And an optical film (3) including a portion formed by inclining and orienting a material exhibiting negative uniaxiality, and is useful as a retardation film for compensating a wide band and a wide viewing angle.
- the laminated optical film force is disposed on both sides of the liquid crystal cell, so that a wide viewing angle can be realized, and even when the display screen is viewed in a diagonal direction, display coloring is suppressed. Therefore, an image with a small gradation inversion area can be displayed.
- the optical film (1) uses a polymer film containing a styrene-based resin in addition to a polycarbonate-based resin.
- the photoelastic coefficient of the optical film can be controlled within the range of 2.0 X 10— u to 6.0 X 10— U m 2 / N, and it has excellent durability. . For this reason, even when applied to a large panel, it can be suitably used in applications where high change in phase difference value is required even under stress, such as high heat resistance and high temperature and high humidity resistance.
- the photoelastic coefficient is preferably from 3.0 X 10— u to 5.0 X 10— U m 2 / N. When the photoelastic coefficient exceeds 6.
- the change in phase difference is large under stress where durability is insufficient.
- the photoelastic coefficient is 2. 0 X 10- u m less than 2 ZN, inferior extension Shin processability undesirably control the Nz coefficient difficult.
- the optical film contains polycarbonate-based resin as a main component, the expression and controllability of birefringence possessed by the polycarbonate-based resin are good. Also, the polycarbonate-based resin and the styrene-based resin have good compatibility, and the optical film has high transparency.
- the optical film (1) has a wide viewing angle characteristic in which the Nz coefficient defined above is Nz ⁇ 0.9.
- Nz coefficient force Nz> 0.9 it is difficult to achieve a wide viewing angle.
- the optical film includes the case of (nx -nz) ⁇ 0,
- the Nz coefficient may be negative. However, from the viewpoint of widening the viewing angle in the vertical and horizontal directions, it is preferable to control the Nz coefficient to be 1 or more, and more preferably 0.5 or more.
- the front phase difference (Re) of the optical film (1) has a small variation in front phase difference. From this point, Re ⁇ 80nm is satisfied. When Re ⁇ 80 nm, the variation in front phase difference becomes large. Re is preferably Re ⁇ 90 nm, more preferably Re ⁇ lOOnm. However, Re ⁇ 300 nm is preferable from the viewpoint of reducing variation in thickness direction retardation.
- the thickness direction retardation: (nx nz) X d is 300
- the weight average molecular weight of the styrene-based resin which is a material of the optical film (1), is preferably 20,000 or less.
- the glass transition temperature of the optical film (1) is preferably in the range of 110 to 180 ° C.
- the optical film (2) a film obtained by stretching a polymer film containing a norbornene polymer can be used.
- the optical film (2) is an optical film obtained by stretching a material similar to that of the optical film (1), that is, a polymer film containing a polycarbonate-based resin and a styrene-based resin.
- elastic modulus 0. 5 X 10- u ⁇ 6.
- OX 10- U m 2 / N preferably can be used: 1. a OX 10- 1 i ⁇ 6. 0 X 10- u m 2 ZN .
- the optical film (2) using these materials has good durability.
- the material that forms the optical film (3) and exhibits optically negative uniaxiality is preferably a discotic liquid crystal compound.
- the material exhibiting optically negative uniaxiality is not particularly limited, but a discotic liquid crystal compound is preferable because it is easy to control the tilt alignment and is a general material and relatively inexpensive.
- the material that forms the optical film (3) and exhibits optically negative uniaxiality is an inclination angle formed between the average optical axis and the normal direction of the optical film (3).
- the tilt orientation is preferably in the range of force 5 ° to 50 °.
- the optical film (3) is a force optical film (3) used as a laminated optical film in combination with the optical film (1) having a controlled three-dimensional refractive index.
- the tilt angle to 50 ° or less, the viewing angle becomes good in any of the four directions (up, down, left, and right) (4 directions), and the viewing angle becomes better or worse depending on the direction. That can be suppressed.
- the inclination The angle is preferably 10 ° to 30 °.
- the optically negative optical material for example, a discotic liquid crystal molecule
- the laminated optical film in the liquid crystal display device includes an optical film (2) that exhibits optically positive uniaxiality, and an optical that includes a portion in which a material that exhibits optically negative uniaxiality is tilted and oriented.
- the optical film (1) with a controlled three-dimensional refractive index is placed between the film (3) and the wide viewing angle can be realized, and the gradation reversal region when viewing in the oblique direction is more enhanced. It is preferable for effective suppression.
- the laminated optical film has the optical film (3) side disposed on the liquid crystal cell side. Arranging in this way also favors the point power of the gradation inversion area when viewed from a wide viewing angle and oblique direction.
- the laminated optical film is disposed so as to be closer to the liquid crystal cell than the polarizing plate.
- FIG. 1 is an embodiment of a cross-sectional view of a laminated optical film used in the present invention.
- FIG. 2 is an embodiment of a cross-sectional view of a laminated optical film used in the present invention.
- FIG. 3 is an embodiment of a cross-sectional view of a laminated optical film used in the present invention.
- FIG. 4 is an embodiment of a cross-sectional view of an elliptically polarizing plate used in the present invention.
- FIG. 5 is an embodiment of a cross-sectional view of an elliptically polarizing plate used in the present invention.
- FIG. 6 is an embodiment of a cross-sectional view of an elliptically polarizing plate used in the present invention.
- FIG. 7 is a cross-sectional view of an example of a reflective transflective liquid crystal display device of an example.
- FIG. 8 is an embodiment of a cross-sectional view of an elliptically polarizing plate of a comparative example.
- FIG. 9 is a cross-sectional view of an example of a reflective transflective liquid crystal display device of a comparative example.
- FIG. 10 is a cross-sectional view of an example of a reflective transflective liquid crystal display device of a comparative example.
- the laminated optical film used in the liquid crystal display device of the present invention includes an optical film (1) having a controlled three-dimensional refractive index, an optical film (2) that exhibits optically positive uniaxiality, and an optical film. And an optical film (3) including a portion in which a material exhibiting negative uniaxiality is tilt-oriented.
- the order of lamination of these optical films is not particularly limited.
- Figure 1 shows the order of the optical film (2) Z optical film (1) Z optical film (3)
- Figure 2 shows the order of optical film (2) / Optical film (3) Z optical film (1)
- Figure 3 shows The optical film (3), the Z optical film (2), and the Z optical film (1) are laminated in this order. Of these, it is preferable to stack the layers as shown in Fig. 1.
- the laminated optical film is used as an elliptically polarizing plate by laminating with a polarizing plate (P) on both sides of a liquid crystal cell.
- 4 to 6 show an elliptically polarizing plate (P1) in which a polarizing plate (P) is laminated on the laminated optical film shown in FIGS. Note that the position where the polarizing plate (P) is laminated on the laminated optical film is not particularly limited. However, when mounted on a liquid crystal display device, the optical film as shown in FIGS. 4 to 5 has a wider viewing angle. It is preferable to laminate the polarizing plate (P) on the (2) side. The case of FIG. 4 is particularly preferable.
- each optical film and polarizing plate can be laminated via an adhesive layer.
- the pressure-sensitive adhesive layer may be a single layer or two or more layers.
- the optical film (1) is obtained by stretching a polymer film containing a polycarbonate-based resin and a styrene-based resin.
- the polycarbonate-based resin various types used for optical films can be used without particular limitation.
- the polycarbonate-based resin is preferably, for example, an aromatic polycarbonate composed of an aromatic divalent phenol component and a force sulfonate component.
- aromatic divalent phenol compounds include 2, 2-bis (4-hydroxyphenol). ) Propane, 2,2bis (4hydroxy-1,3,5 dimethylphenol) propane, bis (4-hydroxyphenol) methane, 1,1-bis (4hydroxyphenol) ethane, 2,2bis ( 4—Hydroxyphenol) butane, 2,2 bis (4 hydroxy-1,3,5 dimethylphenol) butane, 2,2 bis (4 hydroxy-1,3,5 dipropylphenol) propane, 1, 1—bis ( 4-hydroxyphenyl) cyclohexane and the like. These may be used alone or in combination of two or more.
- 2,2 bis (4 hydroxyphenyl) propane, 1,1-bis (4hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) 1,3,3,5 trimethyl Cyclohexane is preferred.
- Polycarbonate containing units of 2, 2 bis (4-hydroxyphenol) propane is excellent in processability, has high transparency, has good birefringence, and is used alone.
- the unit of 1, 1-bis (4hydroxyphenol) 3, 3, 5-trimethylcyclohexane should be used in combination. Is preferred.
- Tg glass transition temperature
- the photoelastic coefficient of the film can be adjusted by changing the ratio of use.
- the content of 1,1-bis (4 hydroxyphenol) -1,3,3,5 trimethylcyclohexane-derived component in polycarbonate resin is increased, Tg is increased and photoelasticity is increased. The coefficient can be lowered.
- the content of 1,1-bis (4 hydroxyphenol) -1,3,5 trimethylcyclohexane-derived component in polycarbonate-based resin is 2,2 bis (4-hydroxyphenol) propane-derived component
- the molar ratio is preferably 4 times or less.
- the carbonate component includes phosgene, bischloroformate of the above divalent phenols, diphenolinole carbonate, di-p-trinole carbonate, phenyl-p-tolyl force-bonate, di-p-phenyl carbonate, di-phenyl carbonate.
- Examples include naphthyl carbonate. Of these, phosgene and diphenyl carbonate are preferred.
- a styrene-based resin is obtained by polymerizing a styrene-based monomer.
- the styrenic monomer include styrene, a-methylol styrene, 2,4-dimethylstyrene, and the like. These may be used alone or in combination of two or more May be. Usually, a homopolymer of styrene or a styrene-based monomer used in combination with a styrene monomer is used.
- the styrene-based resin preferably has a weight average molecular weight of 20,000 or less as measured by the GPC method. If the weight average molecular weight exceeds 20,000, the film becomes cloudy due to poor compatibility with the polycarbonate-based resin, so that it is not suitable for optical applications that require transparency. From this viewpoint, the weight average molecular weight is preferably 10,000 or less. On the other hand, if the weight average molecular weight is too low, it is not preferable from the viewpoint of elution of low molecular weight components in a high temperature and high humidity environment, so the weight average molecular weight is preferably 500 or more, more preferably 1000 or more.
- the ratio of the polycarbonate-based resin to the styrene-based resin is appropriately adjusted so that the photoelastic coefficient of the polymer film (optical film) having good transparency falls within the above range.
- the content of styrene interconnection ⁇ is 2-50 weight 0/0. If the content of styrene resin is less than 2% by weight, it is difficult to control the photoelastic coefficient to a sufficiently low value. From this point of view, the content of styrene-based resin is preferably 5% by weight or more, more preferably 10% by weight or more.
- the content of styrene-based resin is preferably 40% by weight or less, and more preferably 30% by weight or less.
- the Tg of the polymer film affects the heat resistance of the film, considering this point, a higher Tg is preferable.
- the optical film is obtained by stretching a polymer film. Stretching is basically performed under temperature conditions near Tg, and therefore, from the viewpoint of good stretch workability, it is preferable to keep Tg moderately low. From this point of view, the Tg of the polymer film (optical film) is preferably 110 to 180 ° C. In addition, ⁇ , 120-170 ° C, 130-160 ° ⁇ are preferred.
- the polymer film containing the polycarbonate-based resin and the styrene-based resin is subjected to stretching treatment, the Nz coefficient is Nz ⁇ 0.9, and the front phase difference (Re) force Re ⁇ 80 nm.
- An optical film (1) having a controlled three-dimensional refractive index is produced so as to satisfy the requirements.
- the stretching method is not particularly limited.
- the polymer film is biaxially extended in the plane direction.
- Examples thereof include a method of stretching, a method of stretching uniaxially or biaxially in the plane direction, and a method of stretching in the thickness direction.
- a heat-shrinkable film is bonded to a polymer film, and the polymer film is stretched or Z and contracted under the action of the shrinkage force by heating.
- the orientation state can be controlled so that the three-dimensional refractive power Nz ⁇ 0.9 and Re ⁇ 80 nm of the stretched film are controlled by controlling the refractive index in the thickness direction.
- the stretching magnification is appropriately controlled.
- the stretching ratio is 1.0 to 3.0 times, and further 1.0 to 2.0 times.
- the thickness (d) of the optical film obtained by stretching is not particularly limited, but is preferably 1 to 150 ⁇ m, more preferably 5
- a material that exhibits optically positive uniaxiality refers to a material in which the refractive index of the principal axis in one direction is larger than the refractive indexes in the other two directions in the three-dimensional refractive index ellipsoid.
- the optical film (2) exhibiting optically positive uniaxiality can be obtained, for example, by subjecting a polymer film to uniaxial stretching in the plane direction.
- the high molecular polymer that forms the optical film (2) include polyolefins such as polycarbonate and polypropylene, polyesters such as polyethylene terephthalate and polyethylene naphthalate, norbornene-based polymers, polybulal alcohol, polybutylpropylate, and polymethylvinyl ether.
- a polymer film containing polycarbonate-based resin and styrene-based resin which is the same material as the optical film (1), is stretched.
- an optical film having a photoelastic coefficient of 0.5 X 10— u to 6.0 X 10— U m 2 / N is preferable.
- a rod-like nematic liquid crystalline compound can be used as a material for forming the optical film (2).
- the rod-like nematic liquid crystalline compound can be tilted, and the tilted alignment state is determined by the molecular structure, the type of alignment film, and an additive (for example, a plasticizer) appropriately added to the optically anisotropic layer.
- an additive for example, a plasticizer
- the front phase difference ((nx—ny) X d (thickness: nm)) of the optical film (2) is 0 to 500 nm.
- the thickness is 1 to 350 nm. Thickness direction retardation ((nx)
- X d) is preferably 0 to 500 nm, more preferably 1 to 350 nm.
- the thickness (d) of the optical film (2) is not particularly limited, but 1 to 200 / ⁇ ⁇ is preferable.
- the optically negative uniaxial material forming the optical film (3) is a three-dimensional refractive index ellipsoid in which the refractive index of the principal axis in one direction is higher than the refractive indexes in the other two directions. Indicates a small material.
- optically negative uniaxial material examples include liquid crystal materials such as polyimide materials and discotic liquid crystal compounds.
- the tilted alignment state of the liquid crystalline molecules is determined depending on the molecular structure, the type of alignment film, and additives that are appropriately added to the optically anisotropic layer (for example, plasticizer, binder, interface, etc. It can be controlled by the use of an activator).
- the strength is preferably 0 to 200 nm, and more preferably 1 to 150 nm.
- the thickness direction retardation ((nx — nz) X d) is preferably 10 to 400 nm. More preferably it is.
- the thickness (d) of the optical film (3) is not particularly limited, but 1 to 200 / ⁇ ⁇ is preferable.
- the thickness (d) of the optical film (3) is 3 in terms of durability.
- the lamination of the optical film (1) and the optical film (3) is preferably carried out so that the smaller angle formed by each slow axis is 70 ° to 90 °. Furthermore, 80 ° ⁇ 9
- the shape of the laminated optical film of the present invention is not particularly limited, but is preferably rectangular.
- the size is not particularly limited, but when used for a 1 to 8 inch mobile application, it is preferable that the short side is about 15 to 150 mm and the long side is about 20 to 200 mm. .
- the laminated optical film of the present invention is used as an elliptically polarizing plate (P1) together with the polarizing plate (P) as shown in FIGS. 4 to 6 on both sides of the liquid crystal cell.
- the polarizing plate (P) and the optical film (1) and optical film (2) are laminated when the laminated optical film is rectangular when the long side is 0 °.
- the counterclockwise direction is preferably as follows.
- the angle formed by the long side of the laminated optical film and the absorption axis of the polarizing plate (P) is preferably 175 ° ⁇ 5 °.
- the angle formed by the long side of the laminated optical film and the slow axis of the optical film (1) is preferably 0 ° ⁇ 5 °.
- the angle between the long side of the laminated optical film and the slow axis of the optical film (2) is preferably 65 ° ⁇ 5 °.
- the angle formed by the long side of the laminated optical film and the slow axis of the optical film (3) is 90 ° ⁇ 5 °.
- the angle formed by the long side of the laminated optical film and the absorption axis of the polarizing plate (P) is preferably 75 ° ⁇ 5 °.
- the angle formed by the long side of the laminated optical film and the slow axis of the optical film (1) is preferably 0 ° ⁇ 5 °.
- the angle between the long side of the laminated optical film and the slow axis of the optical film (2) is 65 ° ⁇ 5. Is preferred.
- the angle formed by the long side of the laminated optical film and the slow axis of the optical film (3) is preferably 90 ° ⁇ 5 °.
- the optical film (1) and the light Lamination of the scientific film (3) is preferably carried out so that the smaller angle formed by each slow axis is 70 ° to 90 °. More preferably, it is 80 ° to 90 °.
- the polarizing plate (P) usually has a protective film on one or both sides of the polarizer.
- the polarizer is not particularly limited, and various types can be used. Examples of polarizers include hydrophilic polymer films such as polybulal alcohol film, partially formalized polybulal alcohol film, and ethylene / acetate copolymer partial ken film, iodine and dichroic dyes, etc. And uniaxially stretched by adsorbing these dichroic substances, and polyene-oriented films such as dehydrated polyvinyl alcohol and dehydrochlorinated polyvinyl chloride.
- the thickness of the polarizer is not particularly limited, but is generally about 5 to 80 ⁇ m.
- a polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it is prepared by, for example, dyeing polyvinyl alcohol by immersing it in an aqueous solution of iodine and stretching it 3 to 7 times the original length. Can do. If necessary, it can be immersed in an aqueous solution of boric acid or potassium iodide. If necessary, the polybulal alcohol film may be immersed in water and washed before dyeing. In addition to washing the polybulal alcohol film surface with dirt and anti-blocking agents by washing the polybulal alcohol film, it is uneven due to swelling of the polybulu alcohol film. There is also an effect to prevent.
- the stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be stretched and dyed with iodine.
- the film can be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.
- the protective film provided on one or both sides of the polarizer is preferably excellent in transparency, mechanical strength, thermal stability, moisture shielding property, isotropic property and the like.
- the material for the protective film include polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as diacetyl cellulose triacetyl cellulose, acrylic polymers such as polymethyl methacrylate, polystyrene, and the like.
- Styrenic polymers such as Nyaacrylo-tolyl.styrene copolymer (AS resin), polycarbonate polymers, and the like.
- polyethylene, polypropylene, cyclo or Polyolefins having a norbornene structure polyolefin polymers such as ethylene / propylene copolymers, chlorinated bur polymers, amide polymers such as nylon and aromatic polyamide, imide polymers, snolephone polymers, polyethenores norephone polymers , Polyesterate ketone ketone polymer, polyphenylene sulfide polymer, vinylol alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, arylate polymer, polyoxymethylene polymer, epoxy polymer, or Examples of the polymer that forms the protective film include blends of the aforementioned polymers. Other examples include those made into a film of thermosetting or ultraviolet curable resin such as attalinole, urethane, attalinoleurethane, epoxy, and silicone.
- the polymer film described in JP-A-2001-343529 (WO01Z37007), for example, (A) a thermoplastic resin having a substituted side chain and a Z or non-midamide group, and (B) side Examples thereof include a resin composition containing a thermoplastic resin having a substituted and Z-unsubstituted file and -tolyl group in the chain.
- a specific example is a film of a resin composition containing an alternating copolymer of isobutylene and N-methylmaleimide and an acrylonitrile / styrene copolymer.
- a film such as a mixed extruded product of a resin composition can be used.
- the thickness of the protective film can be determined as appropriate, but is generally about 10 to 500 m from the viewpoint of workability such as strength and handleability, and thin layer properties. 20 to 300 m force S is particularly preferable, and 30 to 200 m is more preferable.
- nx-nz * d (where nx is the refractive index in the slow axis direction in the film plane, nz is the refractive index in the film thickness direction, and d is the film thickness).
- the value is -90 ⁇ !
- a protective film of ⁇ + 75 nm is preferably used.
- the thickness direction retardation value (Rth) is more preferably from 80 nm to +60 nm, and particularly preferably from 70 nm to +45 nm.
- the surface is cleaned with alkali or the like from the viewpoint of polarization characteristics and durability.
- a triacetyl cellulose film is preferred. Triacetyl cellulose film is particularly preferable.
- protective films having the same polymer material strength may be used on the front and back surfaces, or different protective films having the same polymer material strength may be used.
- the polarizer and the protective film are usually in close contact with each other through an aqueous adhesive or the like.
- the water-based adhesive include polyvinyl alcohol-based adhesives, gelatin-based adhesives, bull-based latex-based, water-based polyurethane, water-based polyester, and the like.
- a hard coat layer As the protective film, a hard coat layer, an antireflection treatment, an anti-sticking treatment, or a treatment for diffusion or antiglare can be used.
- the hard coat treatment is performed for the purpose of preventing the surface of the polarizing plate from being scratched.
- curing with excellent UV hardness curable resin such as acrylic and silicone is excellent in hardness and sliding characteristics.
- the film can be formed by adding a film to the surface of the protective film.
- the antireflection treatment is performed for the purpose of preventing reflection of external light on the surface of the polarizing plate, and can be achieved by forming an antireflection film or the like according to the conventional art.
- the sticking prevention treatment is performed for the purpose of preventing adhesion with an adjacent layer.
- the anti-glare treatment is performed for the purpose of preventing external light from being reflected on the surface of the polarizing plate and obstructing the visual recognition of the light transmitted through the polarizing plate. It can be formed by imparting a fine concavo-convex structure to the surface of the protective film by an appropriate method such as a surface roughening method or a blending method of transparent fine particles.
- Examples of the fine particles to be included in the formation of the surface fine concavo-convex structure include, for example, silica, alumina, titer, zirconium oxide, tin oxide, indium oxide, acid cadmium having an average particle diameter of 0.5 to 50 m, Transparent fine particles such as inorganic fine particles having conductivity such as acid-antimony oxide and organic fine particles having force of crosslinked or uncrosslinked polymer are used.
- the amount of fine particles used is generally about 2 to 50 parts by weight, preferably 5 to 25 parts by weight per 100 parts by weight of the transparent resin forming the surface fine uneven structure.
- the anti-glare layer may also serve as a diffusion layer (viewing angle expanding function or the like) for diffusing the light transmitted through the polarizing plate and expanding the viewing angle.
- the antireflection layer, anti-sticking layer, diffusion layer, antiglare layer, etc. In addition to being provided on the protective film itself, it can also be provided as a separate optical layer from the transparent protective layer.
- the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is not particularly limited.
- polymers such as acrylic polymers, silicone polymers, polyesters, polyurethanes, polyamides, polyethers, and fluorine-based rubbers are used as the base polymer. It is possible to appropriately select and use what to do.
- those having excellent optical transparency, such as an acrylic adhesive, exhibiting appropriate wettability, cohesiveness, and adhesive properties, and having excellent weather resistance and heat resistance can be preferably used.
- the pressure-sensitive adhesive layer can be formed by an appropriate method. For example, an adhesive solution of about 10 to 40% by weight in which a base polymer or a composition thereof is dissolved or dispersed in a solvent composed of a single solvent or a mixture of appropriate solvents such as toluene or ethyl acetate is prepared. And a method of attaching it directly on the substrate or liquid crystal film by an appropriate development method such as a casting method or a coating method, or forming an adhesive layer on a separator in accordance with the method and applying it to the liquid crystal For example, a method of transferring on the layer.
- the pressure-sensitive adhesive layer includes, for example, natural and synthetic fats, in particular, tackifier-added fat, glass fiber, glass beads, metal powder, other inorganic powders, and other fillers. And additives to be added to the adhesive layer, such as pigments, colorants, and anti-oxidation agents. Further, it may be a pressure-sensitive adhesive layer containing fine particles and exhibiting light diffusibility.
- the thickness of the pressure-sensitive adhesive layer can be appropriately determined according to the purpose of use and adhesive force, and is generally 1 to 500 / ⁇ ⁇ , preferably 5 to 200 111, particularly 10 to: LOO / zm force ⁇ preferred! /
- a separator On the exposed surface of the pressure-sensitive adhesive layer, a separator is temporarily attached and covered for the purpose of preventing contamination until it is put to practical use. This prevents contact with the adhesive layer in the usual handling condition.
- the separator except for the above thickness conditions, for example, an appropriate thin leaf body such as a plastic film, rubber sheet, paper, cloth, non-woven fabric, net, foamed sheet, metal foil, or a laminate thereof, and a silicone-based material as necessary.
- an appropriate one according to the prior art such as those coated with an appropriate release agent such as a long-chain alkyl group or a fluorine-based molybdenum sulfide, can be used.
- the layers such as the optical film and the pressure-sensitive adhesive layer include, for example, salicylic acid ester compounds, benzophenol compounds, and benzotriazole compounds.
- Ultraviolet absorbing ability can be imparted by a method such as a method of treating with an ultraviolet absorber such as a silver compound or a nickel complex salt compound.
- the liquid crystal display device of the present invention is mounted on both sides of the laminated optical film force liquid crystal cell together with polarizing plates.
- the liquid crystal display device is particularly suitable for TN mode, OCB, and homogenous mode liquid crystal display devices.
- it can be preferably used for forming various devices such as a reflective transflective liquid crystal display device.
- a reflective transflective liquid crystal display device or the like is suitably used as a portable information communication device or a personal computer.
- FIG. 7 shows that the elliptically polarizing plate (P1) of the present invention shown in FIGS. 4 to 6 is arranged on both sides of the liquid crystal cell (L) via an adhesive layer in the reflective transflective liquid crystal display device.
- the elliptically polarizing plate (P1) disposed on both sides of the liquid crystal cell (L) is preferably such that the polarizing plate (P) of the elliptically polarizing plate (P1) is farthest from the liquid crystal cell (L).
- Liquid crystal is sealed in the liquid crystal cell (L).
- the upper liquid crystal cell substrate is provided with a transparent electrode, and the lower liquid crystal cell substrate is provided with a reflective layer that also serves as an electrode.
- the elliptically polarizing plates (P1) arranged on both sides of the liquid crystal cell (L) are composed of the same polarizing plate (P), optical film (1), optical film (2), and optical film (3). It may be formed or different. Further, as for the lamination mode of the elliptically polarizing plate (P1), those of the lamination mode (A) and the lamination mode (B) can be preferably used, and the same lamination mode can be used on both sides of the liquid crystal cell (L). Different layers may be used as well as different ones. From the viewpoint of a wide viewing angle, it is preferable to use an elliptically polarizing plate (P1) having a different lamination mode.
- the smaller angle formed by the absorption axis of each polarizing plate (P) is 5 The angle of -30 ° is preferred, more preferably 5 ° -20 °, and even more preferably 5-15 °.
- the smaller angle formed by the absorption axis of each polarizing plate (P) is 60 ° to 80 °. More preferably, it is 65 ° to 80 °, more preferably 65 to 75 °.
- the elliptically polarizing plate (P1) having the same laminate mode is used on both sides of the liquid crystal cell (L)
- both liquid crystal cells (L) When using the elliptically polarizing plate (PI) with a different lamination mode on the side, use the elliptically polarizing plate (P1) with the lamination mode (B) on the viewing side and the elliptically polarizing plate with the lamination mode (A) on the backlight side. It is preferable to use a plate (P1).
- an average optical axis of a material exhibiting optically negative uniaxiality in the optical film (3) It is preferable to arrange the liquid crystal molecules so that the average angle (tilt orientation) is substantially the same as the orientation direction of the liquid crystal molecules at the center (midplane) in the thickness direction of the liquid crystal cell to be aligned by applying voltage up and down.
- the alignment of the liquid crystal cell may be a twisted type or a non-twisted type.
- the reflective transflective liquid crystal display device shown in FIG. 7 shows an example of a liquid crystal cell, and the liquid crystal display device of the present invention can be applied to various other liquid crystal display devices.
- the transflective polarizing plate can be obtained by using a transflective reflective layer such as a half mirror that reflects and transmits light by the reflective layer.
- Transflective polarizing plate can be obtained by using a transflective reflective layer such as a half mirror that reflects and transmits light by the reflective layer.
- the liquid crystal cell When using a liquid crystal display device etc. in a relatively bright atmosphere, it reflects the incident light from the viewing side (display side) and displays an image. Under the atmosphere, it can be built into the back side of a transflective polarizing plate to form a liquid crystal display device that displays images using a built-in light source such as a backlight.
- the transflective polarizing plate can save energy when using a light source such as a knocklight in a bright atmosphere, and can be used with a built-in light source in a relatively low atmosphere. It is useful for the formation of
- the optical film and the elliptically polarizing plate of the present invention can be applied to various other liquid crystal display devices.
- the optical film and the elliptically polarizing plate can be used by laminating other optical layers in practical use.
- the optical layer is not particularly limited.
- an optical layer that may be used for forming a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including a wave plate such as 1Z2 or 1Z4) is used.
- a reflection plate a reflection plate
- a semi-transmission plate a retardation plate (including a wave plate such as 1Z2 or 1Z4)
- One layer or two or more layers can be used.
- the polarizing plate examples include a reflective polarizing plate or a semi-transmissive polarizing plate obtained by further laminating a reflecting plate or a semi-transmissive reflecting plate on the polarizing plate, and a polarizing plate obtained by further laminating a brightness enhancement film on the polarizing plate.
- a reflective polarizing plate is a polarizing plate provided with a reflective layer, and incident light from the viewing side (display side). This is for forming a liquid crystal display device of the type that reflects the light, and has the advantage that it is easy to reduce the thickness of the liquid crystal display device by omitting the incorporation of a light source such as a backlight.
- the reflective polarizing plate can be formed by an appropriate method such as a method in which a reflective layer having a metal isotropic force is attached to one surface of the polarizing plate via a transparent protective layer or the like, if necessary.
- a reflective layer is formed by attaching a foil vapor-deposited film made of a reflective metal such as aluminum on one side of a transparent protective film matted as necessary.
- the transparent protective film may contain fine particles to form a surface fine uneven structure, and a reflective layer having a fine uneven structure thereon.
- the reflective layer having the fine concavo-convex structure has advantages such that incident light is diffused by irregular reflection to prevent the appearance of directivity and glare, and light and dark unevenness can be suppressed.
- the transparent protective film containing fine particles also has an advantage that incident light and its reflected light are diffused when passing through it, and light and dark unevenness can be further suppressed.
- the reflective layer having a fine uneven structure reflecting the surface fine uneven structure of the transparent protective film is formed by an appropriate method such as a vacuum evaporation method, an ion plating method, a sputtering method, or a vapor deposition method. It can be performed by a method of directly attaching to the surface of the transparent protective layer.
- the reflecting plate instead of the method of directly applying the reflecting plate to the transparent protective film of the polarizing plate, it is also possible to use it as a reflecting sheet in which a reflecting layer is provided on an appropriate film according to the transparent film.
- the reflective layer usually has a metallic force, the usage state in which the reflective surface is covered with a transparent protective film or a polarizing plate is used to prevent the reflectance from being lowered by oxidation, and thus the long-term initial reflectance. It is more preferable in terms of sustainability and avoiding the separate provision of a protective layer.
- a polarizing plate in which a polarizing plate and a brightness enhancement film are bonded together is usually provided on the back side of a liquid crystal cell.
- the brightness enhancement film reflects the linearly polarized light with a predetermined polarization axis or circularly polarized light in a predetermined direction when natural light is incident due to the backlight of a liquid crystal display device or the reflection from the back side, and transmits other light.
- a polarizing plate in which a brightness enhancement film is laminated with a polarizing plate allows light having a light source power such as a knock light to enter to obtain transmitted light of a predetermined polarization state, and reflect light without transmitting light other than the predetermined polarization state. Is done.
- Luminance can be improved by increasing the amount of light transmitted through the improvement film and increasing the amount of light that can be used for liquid crystal display image display by supplying polarized light that is difficult to absorb into the polarizer. That is, when light is incident through the polarizer from the back side of the liquid crystal cell by using a knocklight or the like without using the brightness enhancement film, the light having the polarization direction coincides with the polarization axis of the polarizer.
- the brightness enhancement film reflects light that has a polarization direction that is absorbed by the polarizer without being incident on the polarizer and is reflected by the brightness enhancement film, and is further inverted through a reflective layer or the like provided behind the brightness enhancement film.
- the brightness enhancement film is re-entered into the brightness enhancement film, and only the polarized light whose polarization direction is such that the polarization direction of the light reflected and inverted between the two passes through the polarizer, Since the light is transmitted and supplied to the polarizer, light such as a backlight can be efficiently used to display an image on the liquid crystal display device, and the screen can be brightened.
- a diffusion plate may be provided between the brightness enhancement film and the reflective layer.
- the polarized light reflected by the brightness enhancement film is directed to the reflection layer and the like, but the installed diffuser diffuses the light passing therethrough at the same time and simultaneously cancels the polarization state to become a non-polarized state. That is, the diffuser plate returns the polarized light to the original natural light state.
- the light in the non-polarized state that is, the natural light state is directed to the reflection layer and the like, reflected through the reflection layer and the like, and again passes through the diffusion plate and reenters the brightness enhancement film.
- the brightness of the display screen is maintained while at the same time reducing the unevenness of the brightness of the display screen.
- a dielectric multilayer thin film or refractive index anisotropy is compatible.
- a film substrate such as a multilayer laminate of different thin film films, which shows the characteristic of transmitting linearly polarized light with a predetermined polarization axis and reflecting other light
- Appropriate ones such as those that reflect either left-handed or right-handed circularly polarized light and transmit other light can be used.
- the transmission light is directly incident on the polarizing plate with the polarization axis aligned, thereby suppressing absorption loss due to the polarizing plate.
- it can be transmitted efficiently.
- a brightness enhancement film of a type that emits circularly polarized light such as a cholesteric liquid crystal layer
- it can be incident on the polarizer as it is, but the circularly polarized light is linearly polarized via a retardation plate in order to suppress absorption loss. It is preferable to make it enter into a polarizing plate.
- circularly polarized light can be converted to linearly polarized light by using a 1Z4 wavelength plate as the retardation plate.
- a retardation plate that functions as a 1Z4 wavelength plate in a wide wavelength range such as a visible light region has, for example, a retardation layer that functions as a 1Z4 wavelength plate for light-colored light having a wavelength of 550 nm and other retardation characteristics.
- the cholesteric liquid crystal layer also reflects circularly polarized light in a wide wavelength range such as the visible light region by adopting an arrangement structure in which two or three or more layers are superposed as a combination of those having different reflection wavelengths. Can be obtained, and based on this, transparent circularly polarized light in a wide wavelength range can be obtained.
- the polarizing plate may be formed by laminating a polarizing plate such as the above-described polarization-separating polarizing plate and two or more optical layers. Therefore, a reflective elliptical polarizing plate or a semi-transmissive elliptical polarizing plate, which is a combination of the above-described reflective polarizing plate or transflective polarizing plate and a retardation plate, may be used.
- the liquid crystal display device can be formed according to the conventional method.
- a liquid crystal display device is generally formed by assembling a liquid crystal cell, an optical element, and components such as an illumination system as necessary, and incorporating a drive circuit.
- a drive circuit for liquid crystal cells, for example, TN type and S Any type such as TN type and ⁇ type can be used.
- an appropriate liquid crystal display device such as a backlight using a backlight or a reflector can be formed.
- the elliptically polarizing plate of the present invention can be installed on one side or both sides of the liquid crystal cell.
- optical elements When optical elements are provided on both sides, they may be the same or different.
- a single layer or a suitable part such as a diffusing plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusing plate, a knocklight, etc. Two or more layers can be arranged.
- the weight average molecular weight of the tetrohydrofuran-soluble component was calculated by gel permeation chromatography (GPC) method (polystyrene standard) using an HLC-8120GPC system manufactured by TOSOH.
- GPC gel permeation chromatography
- the inclination angle formed from the average optical axis of the optical material tilted and the normal direction of the optical film (3) is 50 to the left and right with the slow axis as the optical film (3).
- the phase difference was measured with the measuring device by an angle of -50 °, and the absolute value of the angle showing the minimum phase difference was obtained.
- the measurement angle when the incident direction of the light from the light source of the measuring device coincided with the normal to the film plane was 0 °.
- Polycarbonate resins are derived from 2,2bis (4hydroxyphenol) propane and 1,1-bis (4hydroxyphenol) 3,3,5-trimethylcyclohexane. The blending ratio was 40:60 by weight.
- the content of styrene-based resin (weight average molecular weight 10,000) in the polymer film was 20% by weight.
- a heat-shrinkable film made of a biaxially stretched polyester film was attached to both sides of the polymer film (PF film) via an adhesive layer. After that, it was held by a simultaneous biaxial stretching machine and stretched 1.3 times at 145 ° C.
- the obtained stretched film was transparent, had a thickness of 60 / zm, a front phase difference of 140 nm, a thickness direction retardation of 70 nm, and an Nz coefficient of 0.5.
- the photoelastic coefficient was 5.
- OX 10- u and Tg was 140 ° C.
- a norbornene-based film (manufactured by JSR Corporation, product name Arton) with a thickness of 100 m was uniaxially stretched 1.5 times at 170 ° C.
- the obtained stretched film had a thickness of 75 / ⁇ ⁇ , a front phase difference of 270 nm, a thickness direction retardation of 270 nm, and an Nz coefficient of 1.0.
- the photoelastic coefficient was 1.0 X 10- u and Tg: l 70 ° C. This is hereinafter referred to as an optical film (2-1).
- WVSA128 (thickness: 80 m) manufactured by Fuji Photo Film Co., Ltd. was used.
- the film is produced by applying a discotic liquid crystal to a support.
- the front phase difference is 33 nm
- the thickness direction retardation is 160 nm
- the tilt angle of the average optical axis is tilted. : 20 °.
- optical film (1), optical film (2-1) and optical film (3) are laminated via an adhesive layer (acrylic adhesive, thickness 30 m), and the lamination as shown in FIG. An optical film was obtained.
- a polarizing plate (P: manufactured by Nitto Denko Co., Ltd., TEG5465DU) is laminated on the optical film (2-1) side of the laminated optical film via an adhesive layer (attal adhesive, thickness 30 m).
- an elliptically polarizing plate (P1-1) as shown in FIG. 4 was obtained.
- the size of the elliptically polarizing plate (P1-1) was 120 mm x 160 mm.
- the elliptically polarizing plate (PI 1) has an anti-clockwise angle when the long side is 0 °, the angle formed by the slow axis of the optical film (1) is 0 °, and the slow axis of the optical film (2 1)
- the angle between the polarizing plates was 65 °, and the angle between the absorption axes of the polarizing plates was 175 °.
- the angle formed by the slow axis of the optical film (3) was set to 90 °.
- the elliptically polarizing plate (PI-1) was mounted on both sides (viewing side and backlight side) of the liquid crystal cell of the reflective transflective TFT-TN type liquid crystal display device shown in FIG.
- the elliptically polarizing plate (P1-1) was mounted so that the polarizing plate side was the farthest stack position from the liquid crystal cell (L) side with respect to V and deviation.
- the elliptically polarizing plates (P1-1) on both sides of the liquid crystal cell were arranged so that the absorption axis of each polarizing plate (P) was 10 °.
- the optical film (1), the optical film (2-1), and the optical film (3) were the same as in Example 1 with respect to deviation. These were laminated via an adhesive layer (acrylic adhesive, thickness 30 / zm) to obtain a laminated optical film as shown in FIG. Next, the laminated optical film is polarized on the optical film (2-1) side through an adhesive layer (acrylic adhesive, thickness 30 ⁇ m).
- a plate (P: manufactured by Nitto Denko Corporation, TEG5465DU) was laminated to obtain an elliptically polarizing plate (P1-2) as shown in FIG. The size of the elliptically polarizing plate (P1-2) was 120 mm XI 60 mm.
- the elliptically polarizing plate (P1-2) is counterclockwise when the long side is 0 °, and the angle formed by the slow axis of the optical film (1) is 0 °, and the optical film (2-1) is slow.
- the angle formed by the phase axis was 65 °, and the angle formed by the absorption axis of the polarizing plate was 75 °.
- the angle formed by the slow axis of the optical film (3) was set to 90 °.
- the elliptically polarizing plate (P1-1) used in Example 1 is placed on the viewing side of the liquid crystal cell of the reflective transflective TFT-TN type liquid crystal display device shown in FIG. Implemented on the backlight side. Both the elliptically polarizing plate (P1-1) and the elliptically polarizing plate (P1-2) were mounted so that the polarizing plate side was the most distant layer position on the liquid crystal cell (L) side. The elliptically polarizing plate (P1-1) and the elliptically polarizing plate (P1-2) on both sides of the liquid crystal cell were arranged so that the absorption axis of each polarizing plate (P) was 70 °.
- a polycarbonate film having a thickness of 400 m was uniaxially stretched by 1.23 times at 170 ° C.
- the obtained stretched film had a thickness of 22 / ⁇ ⁇ , a front phase difference of 250 nm, a thickness direction retardation of 255 nm, and an Nz coefficient of 1.0.
- photoelastic coefficient it was 9. OX 10- 11. This is hereinafter referred to as optical film (2-2).
- the same optical film (1) and optical film (3) as in Example 1 were used.
- the optical film (2-2) was prepared as described above. These were laminated through an adhesive layer (acrylic adhesive, thickness 30 m) to obtain a laminated optical film as shown in FIG.
- a polarizing plate (P: manufactured by Nitto Denko Corporation, TEG5465DU) is placed on the optical film (2-2) side of the laminated optical film through an adhesive layer (acrylic adhesive, thickness 30 m).
- an elliptically polarizing plate (P1-3) and an elliptically polarizing plate (P1-4) as shown in FIG. 4 were obtained.
- the size of the elliptically polarizing plate (P1-3) and the elliptically polarizing plate (P1-4) was 120 mm ⁇ 160 mm.
- the elliptically polarizing plate (PI-3) is optically counterclockwise when the long side is set to 0 °.
- the angle formed by the slow axis of film (1) was 0 °
- the angle formed by the slow axis of optical film (2-2) was 65 °
- the angle formed by the absorption axis of the polarizing plate was 75 °.
- the angle formed by the slow axis of the optical film (3) was set to 90 °.
- the elliptically polarizing plate (P1-4) is counterclockwise when the long side is 0 °, the angle formed by the slow axis of the optical film (1) is 0 °, and the optical film (2-2)
- the angle formed by the slow axis was 65 °, and the angle formed by the absorption axis of the polarizing plate was 175 °.
- the angle formed by the slow axis of the optical film (3) was set to 90 °.
- the elliptically polarizing plate (P1-3) is placed on the viewing side of the liquid crystal cell of the reflective transflective TFT-TN type liquid crystal display device shown in Fig. 7, and the elliptically polarizing plate (P1-4) is placed on the backlight side of the liquid crystal cell.
- Both the elliptically polarizing plate (P1-3) and the elliptically polarizing plate (P1-4) were mounted so that the polarizing plate side was the most distant laminated position of the liquid crystal cell (L) side force.
- the elliptically polarizing plate (P1-3) and the elliptically polarizing plate (P1-4) on both sides of the liquid crystal cell were arranged so that the absorption axis of each polarizing plate (P) was 70 °.
- a norbornene-based film (manufactured by JSR Corporation, product name Arton) with a thickness of 100 m was uniaxially stretched 1.3 times at 170 ° C.
- the obtained stretched film had a thickness of 80 / ⁇ ⁇ , a front retardation: 140 nm, a thickness direction retardation: 140 nm, and an Nz coefficient of 1.0. This was designated as an optical film (2-3).
- the optical film (2-3), the optical film (2-1) and the polarizing plate (P) used in Example 1 are shown in FIG. 1)
- An elliptically polarizing plate (P2) was obtained by laminating an adhesive layer (acrylic adhesive, thickness 30 ⁇ m) in the order of Z polarizing plate (P).
- a liquid crystal display device similar to that of Example 1 was obtained except that the elliptically polarizing plate (P1-1) used on the viewing side in Example 1 was changed to the elliptically polarizing plate (P2).
- the elliptically polarizing plate (P2) was also mounted so that the polarizing plate side was the farthest laminated position from the liquid crystal cell (L) side. Heels The liquid crystal display device is as shown in FIG.
- the elliptically polarizing plate (P2) was also mounted so that the polarizing plate side was the farthest laminated position from the liquid crystal cell (L) side.
- a powerful liquid crystal display device is as shown in FIG.
- Chromaticity change amount ⁇ (x-x) 2 + (yy) 2 ⁇ .
- Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2 Viewing angle Chromaticity variation Viewing angle Chromaticity variation Viewing angle Chromaticity variation Viewing angle Chromaticity variation Viewing angle Chromaticity variation Viewing angle Chromaticity variation Viewing angle Chromaticity variation Viewing angle Chromaticity variation
- the liquid crystal display device of the present invention is particularly suitably used for a reflective transflective liquid crystal display device that can be mounted on a portable information communication device, a personal computer, or the like. Also, as the liquid crystal Display apparatus, TN mode, OCB, implementation of the liquid crystal display device of the homogeneous mode [this; 1 ⁇ to 0
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/573,736 US20080036954A1 (en) | 2004-12-16 | 2005-12-12 | Liquid Crystal Display |
EP05814221A EP1826608A1 (en) | 2004-12-16 | 2005-12-12 | Liquid crystal display |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-363812 | 2004-12-16 | ||
JP2004363812 | 2004-12-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006064766A1 true WO2006064766A1 (ja) | 2006-06-22 |
Family
ID=36587822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/022780 WO2006064766A1 (ja) | 2004-12-16 | 2005-12-12 | 液晶表示装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080036954A1 (ja) |
EP (1) | EP1826608A1 (ja) |
JP (1) | JP3790775B1 (ja) |
KR (1) | KR100814307B1 (ja) |
CN (1) | CN1950745A (ja) |
TW (1) | TWI278705B (ja) |
WO (1) | WO2006064766A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110051061A1 (en) * | 2008-01-16 | 2011-03-03 | Akira Sakai | Liquid crystal display device |
WO2015029958A1 (ja) * | 2013-08-26 | 2015-03-05 | 富士フイルム株式会社 | 輝度向上フィルム、光学シート部材および液晶表示装置 |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008111978A (ja) * | 2006-10-30 | 2008-05-15 | Nitto Denko Corp | 積層光学フィルム、積層光学フィルムを用いた液晶パネル、液晶表示装置、および画像表示装置 |
JP2008139806A (ja) * | 2006-11-02 | 2008-06-19 | Nitto Denko Corp | 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置 |
JP4998941B2 (ja) * | 2006-11-20 | 2012-08-15 | 日東電工株式会社 | 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置 |
JP2008165185A (ja) | 2006-12-07 | 2008-07-17 | Nitto Denko Corp | 積層光学フィルム、積層光学フィルムを用いた液晶パネル、および液晶表示装置 |
JP2008181082A (ja) | 2006-12-25 | 2008-08-07 | Nitto Denko Corp | 液晶パネルおよびそれを用いた液晶表示装置 |
JP5104373B2 (ja) * | 2008-02-14 | 2012-12-19 | 日本ゼオン株式会社 | 位相差板の製造方法 |
JP5069166B2 (ja) | 2008-04-09 | 2012-11-07 | 日東電工株式会社 | 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置 |
TW201015125A (en) | 2008-10-01 | 2010-04-16 | Ind Tech Res Inst | Optical sheet |
TWI408465B (zh) * | 2010-02-05 | 2013-09-11 | Wintek Corp | 液晶顯示器 |
CN102213861B (zh) * | 2011-06-17 | 2012-12-12 | 江苏亿成光电科技有限公司 | 一种3d眼镜镜片 |
WO2014081260A1 (ko) * | 2012-11-23 | 2014-05-30 | 주식회사 엘지화학 | 광학 필름 |
US10180518B2 (en) | 2012-11-23 | 2019-01-15 | Lg Chem, Ltd. | Optical film |
CN103226270B (zh) * | 2013-05-03 | 2016-01-20 | 合肥京东方光电科技有限公司 | 一种半透半反液晶显示面板、显示装置及阵列基板 |
JP6313674B2 (ja) * | 2013-07-05 | 2018-04-18 | 富士フイルム株式会社 | 偏光板および液晶表示装置 |
CN109212823B (zh) | 2018-10-30 | 2021-06-18 | 惠科股份有限公司 | 光学复合膜、显示面板和显示装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999049357A1 (fr) * | 1998-03-23 | 1999-09-30 | Matsushita Electric Industrial Co., Ltd. | Affichage a cristaux liquides |
WO2001059516A1 (fr) * | 2000-02-10 | 2001-08-16 | Matsushita Electric Industrial Co., Ltd. | Affichage a cristaux liquides |
EP1489437A1 (en) * | 2003-06-16 | 2004-12-22 | Nitto Denko Corporation | Laminated optical film, elliptically polarizing plate, and image viewing display |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002077662A (ja) * | 2000-08-24 | 2002-03-15 | Nec Viewtechnology Ltd | スポットキラー制御回路 |
JP2003029038A (ja) * | 2001-07-17 | 2003-01-29 | Nitto Denko Corp | 光学フィルム、偏光板及び表示装置 |
JP2005031621A (ja) * | 2003-06-16 | 2005-02-03 | Nitto Denko Corp | 光学フィルム、偏光光学フィルムおよび画像表示装置 |
JP2008004010A (ja) * | 2006-06-26 | 2008-01-10 | Canon Inc | 通信装置及びその制御方法 |
-
2005
- 2005-12-09 JP JP2005355524A patent/JP3790775B1/ja not_active Expired - Fee Related
- 2005-12-12 WO PCT/JP2005/022780 patent/WO2006064766A1/ja active Application Filing
- 2005-12-12 EP EP05814221A patent/EP1826608A1/en not_active Withdrawn
- 2005-12-12 US US11/573,736 patent/US20080036954A1/en not_active Abandoned
- 2005-12-12 CN CNA2005800144562A patent/CN1950745A/zh active Pending
- 2005-12-12 KR KR1020067022311A patent/KR100814307B1/ko active IP Right Grant
- 2005-12-15 TW TW094144463A patent/TWI278705B/zh not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999049357A1 (fr) * | 1998-03-23 | 1999-09-30 | Matsushita Electric Industrial Co., Ltd. | Affichage a cristaux liquides |
WO2001059516A1 (fr) * | 2000-02-10 | 2001-08-16 | Matsushita Electric Industrial Co., Ltd. | Affichage a cristaux liquides |
EP1489437A1 (en) * | 2003-06-16 | 2004-12-22 | Nitto Denko Corporation | Laminated optical film, elliptically polarizing plate, and image viewing display |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110051061A1 (en) * | 2008-01-16 | 2011-03-03 | Akira Sakai | Liquid crystal display device |
WO2015029958A1 (ja) * | 2013-08-26 | 2015-03-05 | 富士フイルム株式会社 | 輝度向上フィルム、光学シート部材および液晶表示装置 |
KR20160039225A (ko) * | 2013-08-26 | 2016-04-08 | 후지필름 가부시키가이샤 | 휘도 향상 필름, 광학 시트 부재 및 액정 표시 장치 |
CN105492935A (zh) * | 2013-08-26 | 2016-04-13 | 富士胶片株式会社 | 增亮膜、光学片部件及液晶显示装置 |
KR101909074B1 (ko) | 2013-08-26 | 2018-10-18 | 후지필름 가부시키가이샤 | 휘도 향상 필름, 광학 시트 부재 및 액정 표시 장치 |
Also Published As
Publication number | Publication date |
---|---|
TW200628937A (en) | 2006-08-16 |
KR100814307B1 (ko) | 2008-03-18 |
JP3790775B1 (ja) | 2006-06-28 |
KR20070088292A (ko) | 2007-08-29 |
EP1826608A1 (en) | 2007-08-29 |
JP2006195441A (ja) | 2006-07-27 |
CN1950745A (zh) | 2007-04-18 |
TWI278705B (en) | 2007-04-11 |
US20080036954A1 (en) | 2008-02-14 |
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