WO2013099708A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2013099708A1
WO2013099708A1 PCT/JP2012/082824 JP2012082824W WO2013099708A1 WO 2013099708 A1 WO2013099708 A1 WO 2013099708A1 JP 2012082824 W JP2012082824 W JP 2012082824W WO 2013099708 A1 WO2013099708 A1 WO 2013099708A1
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WO
WIPO (PCT)
Prior art keywords
light
liquid crystal
crystal display
display device
light emitting
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Application number
PCT/JP2012/082824
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English (en)
Japanese (ja)
Inventor
知典 宮本
康弘 羽場
昭佳 金光
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住友化学株式会社
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Publication of WO2013099708A1 publication Critical patent/WO2013099708A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to a liquid crystal television, a liquid crystal display device which is utilized such as the LCD monitor and personal computer display.
  • the liquid crystal display device is roughly divided into a backlight device that emits light and a liquid crystal cell device that displays an image using light emitted from the backlight device.
  • the gradation and brightness set in each pixel are proportional to each other and the relationship indicated by a straight line is ideal, but in reality, the relationship indicated by a curve is obtained. .
  • This gradation-luminance curve is called a ⁇ curve.
  • the ⁇ curve is preferably close to a straight line.
  • the liquid crystal display device is required to have a small amount.
  • a main object of the present invention is to provide a liquid crystal display device in which a change due to a viewing angle of a ⁇ curve is suppressed in all azimuth angles.
  • the inventors of the present invention have studied a liquid crystal display device that can be simply configured and suppresses a change in the viewing angle of the ⁇ curve in all azimuth angles, and have intensively studied the liquid crystal display device in order to solve the above problems. As a result, the present invention was completed.
  • the liquid crystal display device is provided with a surface light emitting unit that emits planar light from a light emitting surface, and a light emitting surface side of the surface light emitting unit, and light from the light emitting surface is incident And a liquid crystal cell that is provided on the light emission side of the backlight device and has an antiglare layer.
  • the surface light emitting unit includes a light guide plate, a light source disposed on an end surface of the light guide plate, and a reflection plate disposed on the opposite side of the light deflection layer with respect to the light guide plate.
  • a first azimuth angle, a second azimuth angle, a third azimuth angle, and a fourth azimuth angle in a plane orthogonal to a first direction that is a direction from the surface light emitting portion toward the light deflection layer The first to fourth azimuth angles of 0 °, 45 °, 90 °, and 135 ° with respect to the second direction that is the direction from the light guide plate to the light guide plate, respectively,
  • the luminance at a certain distance from the measurement target point on the light exit surface is also measured in the viewing angle range of ⁇ 40 ° to + 40 °, ⁇ 60 ° to ⁇ 74 °, and + 60 ° to + 74 ° with respect to the first direction.
  • the maximum value in the luminance in the range of ⁇ 60 ° to ⁇ 74 ° and + 60 ° to + 74 ° in all the first to fourth azimuth angles is All brightness in the viewing angle range of -40 ° to + 40 ° is less than 40% It is in.
  • the sum of the transmission clarity of the antiglare layer obtained through optical combs having comb widths of 0.125 mm, 0.5 mm, 1.0 mm and 2.0 mm is 70% or more and 300% or less.
  • the backlight device further includes a light diffusion layer provided on the light emitting side of the light deflection layer, and the haze value of the light diffusion layer is 86% or less. Good.
  • All the luminances in the viewing angle range of ⁇ 40 ° to + 40 ° in all of the first to fourth azimuth angles may be 15% or less.
  • the light guide plate, cross section may be trapezoidal plate.
  • the light guide plate is a light guide plate having a shape in which two plates having a trapezoidal cross section are in contact with each other so as to share the upper base of the trapezoid. May be.
  • the reflector may be a mirror type.
  • the light deflection layer is a prism sheet in which a plurality of first prism portions are provided on the incident surface side on which light from the light emitting surface of the surface light emitting portion is incident,
  • Each of the plurality of first prism portions may extend in a third direction, which is a direction orthogonal to the first and second directions, and be arranged in parallel in the second direction.
  • the cross-sectional shape orthogonal to the third direction of each of the plurality of first prism portions is a triangle, and the cross-sectional shape of each of the plurality of first prism portions.
  • the vertices of the triangles are located on the surface light emitting unit side, and the bases of the triangles that are the cross-sectional shapes of the plurality of first prism portions may be arranged in a straight line.
  • the light deflection layer is provided with a plurality of second prism portions on the side opposite to the incident surface side, and each of the plurality of second prism portions is in the second direction. It may extend and be arranged in parallel in the third direction.
  • FIG. 1 is a diagram illustrating one embodiment of a backlight device used in a liquid crystal display device according to an embodiment.
  • FIG. 2 is a diagram illustrating a liquid crystal display device according to an embodiment.
  • FIG. 3 is a diagram illustrating an angular distribution of luminance of light emitted from a light guide plate of a backlight device used in a liquid crystal display device according to an embodiment.
  • FIG. 4 is a diagram illustrating a method of measuring an angular distribution of luminance of light emitted from a light guide plate of a backlight device used in the liquid crystal display device according to an embodiment and the liquid crystal display device according to Example 1.
  • FIG. 1 is a diagram illustrating one embodiment of a backlight device used in a liquid crystal display device according to an embodiment.
  • FIG. 2 is a diagram illustrating a liquid crystal display device according to an embodiment.
  • FIG. 3 is a diagram illustrating an angular distribution of luminance of light emitted from a light guide plate of a backlight device used
  • FIG. 5 is a diagram illustrating the measurement result of the angular distribution of the luminance of light emitted from the light guide plate of the backlight device used in the liquid crystal display device of Example 1.
  • FIG. 6 is a diagram illustrating a luminance measurement method when measuring the ⁇ curve in the liquid crystal display device according to the first embodiment.
  • FIG. 1 shows one embodiment of a backlight device used in a liquid crystal display device according to an embodiment.
  • the backlight device 11 includes a light deflection layer 16, a light source 13, a light guide plate 12, a reflection plate 14, and a light diffusion layer 9.
  • a light source 13 and the light guide plate 12 and the reflection plate 14, constitutes a surface emitting unit 15 for generating planar light.
  • the light emitting surface 12 a corresponds to the light emitting surface 15 a of the surface light emitting unit 15.
  • the light guide plate 12 and the light deflection layer 16 are arranged in a predetermined direction so that planar light emitted from the light guide plate 12 enters the light deflection layer 16.
  • the light deflection layer 16 and the light diffusion layer 9 are arranged in a predetermined direction so that the planar light emitted from the light deflection layer 16 enters the light diffusion layer 9.
  • the “predetermined direction” is referred to as a Z-axis direction (first direction), and two directions orthogonal to the Z-axis direction are defined as an X-axis direction (second direction) and a Y-axis direction (third direction). Direction).
  • the X-axis direction and the Y-axis direction are orthogonal to each other.
  • the light guide plate 12 is made of a translucent material.
  • the translucent material include methacrylic resin, polycarbonate resin, polyester resin, and cyclic polyolefin resin.
  • printed dots, linear V-grooves, and the like for adjusting the in-plane distribution of the amount of light emitted from the light emitting surface 12 a may be formed.
  • the light source 13 is disposed on the end faces 12b and 12c of the light guide plate.
  • the light source 13 may be a linear light source or a point light source.
  • a cold cathode tube or a light emitting diode (LED: Light Emitting Diode) and the like may be used as the light source 13, for example, it may be one white light emitting LED including three LED chips that emit red, blue, and green colors, or each of red, blue, and green. An LED in which three LEDs emitting colors are connected and integrated may be used.
  • the LED may be an LED that emits white light by a combination of a blue light emitting LED chip or a near ultraviolet light emitting LED chip and a phosphor.
  • the light deflection layer 16 is disposed on the light exit surface 12 a side of the light guide plate 12.
  • An example of the light deflection layer 16 is a prism sheet.
  • the light deflection layer 16 serving as a prism sheet extends in a direction (Y-axis direction shown in FIG. 1) parallel to the side where the light source is arranged on the rectangular light emitting surface of the backlight device 11 and also in the extending direction.
  • the large number of prism portions 16a are light deflected on a surface (perpendicular to the extending direction (Y-axis direction) of the prism portion 16a) of the rectangular light emitting surface of the backlight device 11 that is perpendicular to the side where the light source is disposed.
  • the cross section when the layer 16 is cut has a shape in which a plurality of triangles are connected.
  • the cross-sectional shape of the prism portion 16a in the extending direction of the prism portion 16a is a triangle, and the plurality of prism portions 16a are continuous so that the bottoms of the cross-section are aligned on a straight line.
  • the light deflection layer 16 as a prism sheet is disposed with the apex 16b not on the base of the triangle facing the light guide plate 12 in the cross section of the prism portion 16a orthogonal to the extending direction of the prism portion 16a.
  • a plurality of prism parts are formed on the surface 16c opposite to the light incident side on which the prism parts 16a are formed. Also good.
  • the plurality of prism portions extend in a direction (X-axis direction shown in FIG. 1) perpendicular to the side where the light source 13 is arranged on the rectangular light emitting surface of the backlight device 11 and are orthogonal to the extending direction. It can arrange
  • the surface light emitting unit 15 including the light guide plate 12, the light source 13, and the reflection plate 14 is a direction (X axis direction) from the light source 13 toward the light guide plate 12 in a plane orthogonal to the Z axis direction.
  • the surface light emitting unit 15 is arranged so that the X-axis direction matches the vertical direction.
  • the surface light emitting unit 15 is arranged such that the direction from the end surface 12b toward the end surface 12c (in other words, the direction from the light source 13 on the end surface 12b side toward the light guide plate 12) is upward in the vertical direction.
  • the four predetermined azimuth angles ⁇ are the first azimuth angles that are 0 ° with respect to the upward direction when the upward direction in the vertical direction (X-axis direction) is 0 °.
  • the azimuth angle of 4 is 4.
  • the X-axis direction is the vertical direction
  • the Z-axis direction is substantially the horizontal direction.
  • the light emitted from the light guide plate 12 with respect to all the first to fourth azimuth angles ⁇ 1 to ⁇ 4 is a certain distance from the measurement target point in the light emission surface 12a.
  • the luminance is measured in a viewing angle range of ⁇ 40 ° to + 40 ° with respect to the direction of the normal to the light exit surface 12a (Z-axis direction), and is ⁇ 60 ° to ⁇ 74 ° and + 60 ° to + 74 °. It is also measured in the range of viewing angles.
  • the predetermined condition in the light guide plate 12 is the maximum value among the luminances in the range of viewing angles of ⁇ 60 ° to ⁇ 74 ° and + 60 ° to + 74 ° in all the first to fourth azimuth angles ⁇ 1 to ⁇ 4.
  • all the luminances in the viewing angle range of ⁇ 40 ° to + 40 ° in all the first to fourth azimuth angles ⁇ 1 to ⁇ 4 are 40% or less.
  • the first to fourth All the luminances in the viewing angle range of ⁇ 40 ° to + 40 ° in all the azimuth angles ⁇ 1 to ⁇ 4 are 15% or less.
  • FIG. 3 is an example of the angular distribution of the luminance of the emitted light from the light guide plate 12 that satisfies the predetermined condition.
  • FIG. 3 shows the result of measuring the light emitted from the light guide plate 12 at the first to fourth azimuth angles ⁇ 1 to ⁇ 4.
  • the horizontal axis in FIG. 3 is an angle (°) representing vision with respect to the normal direction (Z-axis direction) of the light emitting surface 12a, and the vertical axis is luminance (cd / m 2 ).
  • the solid line has an azimuth angle of 0 ° (the solid line is a thick solid line and a part of a dotted line showing the azimuth angles of 45 ° and 90 ° on the left side of the graph in FIG. 3, respectively)
  • the thick solid line has an azimuth angle of 45 ° (the thick solid line is overlapped with a part of the solid line and the dotted line respectively showing the case where the azimuth angle is 0 ° and 90 ° on the left side of the graph of FIG. 3).
  • the dotted line has an azimuth angle of 90 ° (the dotted line overlaps with a part of a broken line indicating that the azimuth angle is 135 ° on the right side of the graph of FIG.
  • the rectangles drawn by the two-dot chain lines shown at the left and right ends of FIG. 3 indicate viewing angle ranges of ⁇ 60 ° to ⁇ 74 ° and + 60 ° to + 74 °.
  • a rectangle drawn by a one-dot chain line near the lower center of FIG. 3 indicates a viewing angle range of ⁇ 40 ° to + 40 °.
  • the maximum value of the luminance in the viewing angle range of ⁇ 60 ° to ⁇ 74 ° and + 60 ° to + 74 ° appears at the azimuth angle 0 ° (first azimuth angle ⁇ 1).
  • the maximum value is 1.4 ⁇ 10 4 in the unit of the vertical axis in FIG.
  • All the luminances in the viewing angle range of ⁇ 40 ° to + 40 ° in all the first to fourth azimuth angles ⁇ 1 to ⁇ 4 are 1.5 ⁇ 10 3 or less in the unit of the vertical axis in FIG.
  • all the luminances in the viewing angle range of ⁇ 40 ° to + 40 ° in all of the first to fourth azimuth angles ⁇ 1 to ⁇ 4 are 40% (5.6 ⁇ 1.4 ⁇ 10 4) which is the maximum value. 10 3 ) or less, and 15% (2.1 ⁇ 10 3 ) or less.
  • a preferred embodiment of the light guide plate 12 is a light guide plate in which the shape (cross-sectional shape) of the surface orthogonal to the arrangement direction of the light sources is a trapezoid.
  • each end surface is an end surface corresponding to an upper base (shorter side) and a lower base (longer side) of the trapezoid. Accordingly, the thickness decreases from one end face toward the other end face.
  • the light emitting surface 12a, end surface 12b, 12c respectively are substantially orthogonal.
  • the light guide plate 12 whose cross section is a trapezoidal plate, for example, adjusts the angle of intersection with the Z-axis direction of the surface on the opposite side of the light output surface 12a of the light guide plate 12 (surface on the reflecting plate 14 side), and / or Alternatively, as described above, it can be designed to satisfy the above conditions by forming printing dots, V-grooves and the like on the surface of the light guide plate 12.
  • the light guide plate 12 of the preferred embodiment has a shape in which two plates 121, 121 having a trapezoidal cross section are in contact with each other so as to share the upper base (shorter bottom) of the trapezoid (FIG. 1). .
  • the light emission surface 12a is a plane corresponding to one side of the trapezoidal cross section of each of the plates 121 and 121. Composed.
  • the end surfaces 12 b and 12 c of the light guide plate 12 are surfaces corresponding to the lower bases in the cross sections of the plates 121 and 121.
  • the thickness decreases from the end surfaces 12b and 12c toward the center as illustrated in FIG.
  • Each of the two plates 121 and 121 is disposed such that the light emitting surface 12a of the light guide plate 12 and the z-axis direction are substantially orthogonal to each other.
  • the Z-axis direction of the surface (surface on the reflecting plate 14 side) on the opposite side to the light emitting surface 12a of each of the two plates 121 and 121 constituting the light guide plate 12 By adjusting the crossing angle to the surface of the light guide plate 12 and / or forming printed dots, V-grooves, or the like on the surface of the light guide plate 12, it can be designed to satisfy the above conditions.
  • Examples of the material of the light deflection layer 16 include polycarbonate resin, ABS resin, methacrylic resin, methyl methacrylate-styrene copolymer resin, polystyrene resin, acrylonitrile-styrene copolymer resin, polyolefin resin such as polyethylene and polypropylene. included.
  • the prism film can be manufactured by a known method such as a profile extrusion method, a press molding method, an injection molding method, a roll transfer method, a laser ablation method, a mechanical cutting method, a mechanical polishing method, and a photopolymer process.
  • an ionizing radiation curable resin When manufacturing by a photopolymer process, what is called an ionizing radiation curable resin can be used as a material.
  • the ionizing radiation curable resin include those synthesized from polyfunctional acrylates such as acrylic acid or methacrylic acid ester of polyhydric alcohol, diisocyanate and polyhydric alcohol, and hydroxyester of acrylic acid or methacrylic acid. Polyfunctional urethane acrylate is included. These methods may be used alone, or two or more methods may be combined.
  • the thickness of the light deflection layer 16 is usually 0.05 to 5 mm, preferably 0.1 to 2 mm.
  • the distance between the ridge lines of each prism portion 16a is usually in the range of 10 to 500 ⁇ m, and preferably in the range of 30 to 200 ⁇ m.
  • Reflector 14 is installed on (the side opposite to the emission surface) the lower surface 12d of the light guide plate 12.
  • the reflecting plate 14 returns the light (leaked light) emitted from the lower surface of the light guide plate 12 to the light guide plate 12 side.
  • a white sheet or a mirror type sheet is used as the reflecting plate 14.
  • the white sheet is a sheet that diffuses light by adding a filler to a resin film such as polyester or by providing a gap between the added filler and a base resin.
  • the mirror type sheet is a sheet in which a specular reflection component is strengthened by depositing a metal such as aluminum or silver on the surface of a resin film such as polyester. The mirror type is preferable in that high front luminance can be obtained.
  • Examples of the mirror type sheet include a sheet in which the reflected light has no diffuse reflection component, only a regular reflection component, and has a smooth metal deposition surface without fine irregularities.
  • An example of a mirror-type reflector is a sheet having a mirror-finished surface.
  • the light diffusion layer 9 is a light diffusion layer having a haze value of 86% or less.
  • the haze value of the light diffusion layer 9 is preferably 10% or more and 86% or less, more preferably 20% or more and 86% or less, and further preferably 30% or more and 86% or less.
  • the light diffusing layer 9 is obtained, for example, by applying a paint in which a diffusing agent is dispersed in a binder resin to a resin film serving as a base material.
  • the material used as the base material of the light diffusion layer 9 include polycarbonate, methacrylic resin, methyl methacrylate-styrene copolymer resin, acrylonitrile-styrene copolymer resin, methacrylic acid-styrene copolymer resin, polystyrene, poly Examples thereof include polyolefins such as vinyl chloride, polypropylene, and polymethylpentene, cyclic polyolefins, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyamide resins, polyarylate, and polyimide.
  • the binder resin may be any resin having a high light transmittance, and for example, an acrylic resin, a polyurethane resin, or an ionizing radiation curable resin is used.
  • the diffusing agent mixed and dispersed in the binder resin include fine particles made of a substance having a refractive index different from that of the material serving as the binder resin.
  • Specific examples of the diffusing agent include organic fine particles and inorganic fine particles of a type different from the binder resin material.
  • the organic fine particles include acrylic resin, melamine resin, polyethylene, polystyrene, organic silicone resin, acrylic-styrene copolymer and the like.
  • the inorganic fine particles include calcium carbonate, silica, aluminum oxide, barium carbonate, barium sulfate, titanium oxide, and glass.
  • One or more of the above diffusing agents are mixed and used.
  • Organic polymer balloons and glass hollow beads can also be used as diffusing agents.
  • the average particle diameter of the diffusing agent is preferably in the range of 0.5 ⁇ m to 30 ⁇ m.
  • the shape of the diffusing agent may be not only spherical but also flat, plate-like and needle-like.
  • the light diffusing layer 9 is blended with each component and other components as necessary, and after the coating liquid prepared by dissolving or dispersing this in a suitable solvent is applied to the substrate and dried, It can be formed by curing using a necessary curing method as appropriate.
  • the coating solution is applied to the substrate by a known method such as a roll coating method, a bar coating method, a spray coating method, or an air knife coating method.
  • the diffusing agent may be directly dispersed in the base resin by melt kneading.
  • the thickness of the light diffusing layer 9 is not particularly limited as long as the thickness does not hinder the handling of the light diffusing layer 9.
  • the thickness of the light diffusion layer 9 is, for example, about 10 to 250 ⁇ m, preferably 12 to 100 ⁇ m.
  • the haze value can be reduced to 86% or less by adjusting the kind of particles used as a diffusing agent, the amount added, and the surface shape.
  • the haze value can be measured using a haze computer (HZ-2 manufactured by Suga Test Instruments Co., Ltd.) in accordance with JIS-K-7136.
  • a haze computer HZ-2 manufactured by Suga Test Instruments Co., Ltd.
  • JIS-K-7136 JIS-K-7136.
  • As the light diffusion layer 9 commercially available ones such as “Opulse PBS-632L” (manufactured by Eiwa Co., Ltd.) and “LSE type” (manufactured by Kimoto Co., Ltd.) can be used.
  • FIG. 2 is a diagram schematically showing a liquid crystal display device according to an embodiment.
  • the liquid crystal display device 1 includes a liquid crystal cell device 20 and a backlight device 11.
  • the liquid crystal cell device 20 is disposed on the light incident side of the liquid crystal cell 21 with the liquid crystal layer 23 provided between the pair of transparent substrates 22a and 22b (the backlight device 11 and the liquid crystal cell 21 A first polarizing plate 41 (disposed between), a second polarizing plate 52 disposed on the light emitting side of the liquid crystal cell 21, and an antiglare layer 53 disposed on the light emitting side of the second polarizing plate 52.
  • a first polarizing plate 41, a liquid crystal cell 21, a second polarizing plate 52, and an antiglare layer 53 are arranged in this order from the backlight device 11 side.
  • a liquid crystal cell 21 used in a liquid crystal display device manufactured using the backlight device 11 includes a pair of transparent substrates 22a and 22b arranged to face each other at a predetermined distance, and the pair of transparent substrates 22a and 22b.
  • Each of the pair of transparent substrates 22a and 22b is formed by laminating a transparent electrode and an alignment film, and the liquid crystal is aligned by applying a voltage based on display data between the transparent electrodes.
  • Display mode of the liquid crystal cell 21, TN mode, IPS mode, display system such as the VA system may be employed.
  • polarizers include, for example, a dichroic dye or iodine adsorbed and oriented on a polarizer substrate such as polyvinyl alcohol resin, polyvinyl acetate resin, ethylene / vinyl acetate (EVA) resin, polyamide resin, or polyester resin.
  • a polyvinyl alcohol / polyvinylene copolymer in which a molecular chain oriented of a dichroic dehydrated product of polyvinyl alcohol (polyvinylene) is contained in a molecularly oriented polyvinyl alcohol film.
  • a polyvinyl alcohol resin polarizer substrate having a dichroic dye or iodine adsorbed and oriented is preferably used as the polarizer.
  • the thickness of the polarizer is generally preferably 100 ⁇ m or less, more preferably in the range of 10 to 50 ⁇ m, and still more preferably in the range of 25 to 35 ⁇ m for the purpose of reducing the thickness of the polarizing plate.
  • the support film for supporting and protecting the polarizer is preferably a film made of a polymer having low birefringence and excellent in transparency, mechanical strength, thermal stability, moisture shielding properties and the like.
  • Such films include, for example, cellulose acetate resins such as TAC (triacetyl cellulose), acrylic resins, fluorine resins such as tetrafluoroethylene / hexafluoropropylene copolymers, and polycarbonate resins.
  • Polyester resins such as polyethylene terephthalate, polyimide resins, polysulfone resins, polyethersulfone resins, polystyrene resins, polyvinyl alcohol resins, polyvinyl chloride resins, polyolefin resins or polyamide resins Includes those that have been molded.
  • the norbornene-based thermoplastic resin film is a good barrier from heat and wet heat, the durability of the polarizing plate 41 is greatly improved, and the dimensional stability is greatly improved because of its low moisture absorption rate. Therefore, the norbornene-based thermoplastic resin film can be used particularly preferably.
  • the thickness of the support film is preferably 500 ⁇ m or less, more preferably in the range of 5 to 300 ⁇ m, and still more preferably in the range of 5 to 150 ⁇ m. Is the thickness.
  • the second polarizing plate 52 is a pair with the first polarizing plate 41 disposed on the back side of the liquid crystal cell 21.
  • the second polarizing plate 52 those exemplified in the first polarizing plate 41 may be suitably used.
  • the second polarizing plate 52 is disposed so that the polarization plane thereof is orthogonal to the polarization plane of the first polarizing plate 41.
  • the antiglare layer 53 is provided on the surface of the second polarizing plate 52.
  • the antiglare layer 53 can be formed, for example, by applying a resin solution in which a filler made of fine particles is dispersed on the second polarizing plate 52. Specifically, if the coating thickness of the resin solution is adjusted so that the filler appears on the surface of the coating film, fine irregularities are formed on the surface of the substrate, and the antiglare layer 53 is obtained.
  • the anti-glare layer 53 may have fine irregularities formed on the surface of the base film as the anti-glare layer 53 without using a fine filler as described above.
  • methods for forming fine irregularities on the surface of the base film include a method of surface processing of the base film by sandblasting, embossing, etc., and a mold in which the irregularities are reversed in the base film production process. etc. a method of forming fine irregularities with a mold or embossing roll having a surface.
  • the antiglare layer 53 is formed by surface diffusion (external haze)
  • the present invention is not limited to this.
  • the antiglare layer 53 may be a layer that is diffused by internal diffusion (internal haze). Further, it may be a layer that is diffused by both internal diffusion (internal haze) and surface diffusion (external haze / unevenness).
  • the resin solution is not particularly limited as long as a translucent resin can be obtained.
  • the resin solution include a cured product of an ionizing radiation curable resin such as an ultraviolet curable resin and an electron beam curable resin, a cured product of a thermosetting resin, and a cured product of a thermoplastic resin and a metal alkoxide. .
  • ionizing radiation curable resins are preferably used because they have high hardness and can impart high scratch resistance as a light diffusion film provided on the surface of the liquid crystal display device 1.
  • the translucent resin is formed by curing the resin by irradiation with ionizing radiation or heating.
  • ionizing radiation curable resins include those synthesized from polyfunctional acrylates such as acrylic acid or methacrylic acid ester of polyhydric alcohol, diisocyanate and polyhydric alcohol and hydroxyester of acrylic acid or methacrylic acid, etc. Polyfunctional urethane acrylate and the like are included. Besides these, polyether resins having an acrylate functional group, polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and the like can also be used.
  • thermosetting resins examples include phenolic resins, urea melamine resins, epoxy resins, unsaturated polyester resins, silicone resins, etc., in addition to thermosetting urethane resins composed of acrylic polyols and isocyanate prepolymers.
  • thermoplastic resins include cellulose derivatives such as acetylcellulose, nitrocellulose, acetylbutylcellulose, ethylcellulose, and methylcellulose; vinyl acetate and copolymers thereof, vinyl chloride and copolymers thereof, vinylidene chloride and copolymers thereof, and the like Acetal resins such as polyvinyl formal and polyvinyl butyral; acrylic resins such as acrylic resins and copolymers thereof, methacrylic resins and copolymers thereof; polystyrene resins; polyamide resins; polyester resins; polycarbonates System resin and the like are included.
  • cellulose derivatives such as acetylcellulose, nitrocellulose, acetylbutylcellulose, ethylcellulose, and methylcellulose
  • vinyl acetate and copolymers thereof vinyl chloride and copolymers thereof, vinylidene chloride and copolymers thereof, and the like
  • Acetal resins such as polyvinyl formal and polyvinyl
  • a silicon oxide matrix using a silicon alkoxide material as a raw material can be used.
  • tetramethoxysilane, tetraethoxysilane, and the like which can be made into an inorganic or organic-inorganic composite matrix (translucent resin) by hydrolysis or dehydration condensation.
  • translucent fine particles made of translucent organic fine particles or inorganic fine particles can be used.
  • organic fine particles made of acrylic resin, melamine resin, polyethylene, polystyrene, organic silicone resin, acrylic-styrene copolymer, etc. and made of calcium carbonate, silica, aluminum oxide, barium carbonate, barium sulfate, titanium oxide, glass, etc.
  • examples include inorganic fine particles.
  • Organic polymer balloons and glass hollow beads can also be used.
  • the translucent fine particles may be composed of one kind of fine particles, or may contain two or more kinds of fine particles.
  • the shape of the light-transmitting fine particles may be any of spherical, substantially spherical, flat, plate-like, needle-like, and indefinite shape.
  • the shape of the translucent fine particles is preferably spherical or substantially spherical.
  • the weight average particle diameter of the translucent fine particles is preferably 0.5 ⁇ m or more and 15 ⁇ m or less, and more preferably 4 ⁇ m or more and 8 ⁇ m or less.
  • the weight average particle diameter of the light-transmitting fine particles is less than 0.5 ⁇ m, visible light having a wavelength region of 380 nm to 800 nm cannot be sufficiently scattered, the light diffusibility of the antiglare layer 53 becomes insufficient, and a wide viewing angle. May not be obtained.
  • the weight average particle size exceeds 15 ⁇ m, if the transmission sharpness is adjusted to 70% or more and 180% or less, sufficient light diffusibility cannot be obtained, and similarly a wide viewing angle may not be obtained.
  • the content of the light transmissive fine particles in the antiglare layer 53 is preferably 25 parts by weight or more and 60 parts by weight or less, and 30 parts by weight or more and 50 parts by weight or less with respect to 100 parts by weight of the light transmissive resin. Is more preferable.
  • the content of the light-transmitting fine particles is less than 25 parts by weight with respect to 100 parts by weight of the light-transmitting resin, the light diffusibility of the antiglare layer 53 becomes insufficient, and a wide viewing angle cannot be obtained. As a result of the sharpness exceeding 180%, moire may occur.
  • the content of the light-transmitting fine particles exceeds 60 parts by weight with respect to 100 parts by weight of the light-transmitting resin, the light diffusibility becomes too strong and the front contrast may be lowered.
  • Application of the resin solution onto the base film can be performed by, for example, a gravure coating method, a micro gravure coating method, a rod coating method, a knife coating method, an air knife coating method, a kiss coating method, and a die coating method.
  • the layer thickness of the antiglare layer 53 is preferably in the range of 1 to 30 ⁇ m.
  • the layer thickness of the anti-glare layer 53 is 1 ⁇ m or more, sufficient scratch resistance required for the anti-glare layer 53 disposed on the viewing side surface of the liquid crystal display device 1 is provided, which is preferable.
  • the layer thickness is 30 ⁇ m or less, the amount of curl generated in the produced antiglare layer 53 is reduced, and the handling property in bonding to other films and substrates is improved, which is preferable.
  • the antiglare layer 53 of the present embodiment has a transmission transparency sum obtained through optical combs of 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm (hereinafter simply referred to as “transmission definition”) of 70%. More than 300%.
  • “The sum of transmitted clarity obtained through optical combs of 0.125 mm, 0.5 mm, 1.0 mm and 2.0 mm” is based on JIS K 7105, and the ratio of the width between the dark part and the bright part is 1: 1 is the sum of transmitted sharpness (image sharpness) measured using four types of optical combs whose widths are 0.125 mm, 0.5 mm, 1.0 mm and 2.0 mm. Therefore, the maximum value of “transmission definition” here is 400%.
  • the transmission clarity of the antiglare layer 53 is less than 70%, light scattering is too strong. For this reason, in the liquid crystal display device to which this antiglare layer is applied, for example, when displaying white, the front contrast is reduced due to the fact that light in the front direction of the liquid crystal display device is scattered too much by the light diffusion layer, Display quality deteriorates.
  • the transmission clarity of the antiglare layer 53 is larger than 300%, the regular matrix of the surface uneven structure of the light deflection layer (prism film) 16 of the backlight device 11 of the liquid crystal display device 1 and the color filter of the liquid crystal cell 21 is provided. Moire of transmitted light occurs due to interference with the structure.
  • the transmission clarity of the antiglare layer 53 is preferably 70% or more and 200% or less, and more preferably 90% or more and 150% or less.
  • the measurement of transmission clarity is performed using a measurement sample in which a light diffusion film is bonded to a glass substrate using an optically transparent adhesive. At this time, the surface which becomes the base film side of a light-diffusion film is bonded by a glass substrate. Thereby, the curvature of the film at the time of a measurement can be prevented, and measurement reproducibility can be improved.
  • a image clarity measuring device for example, “ICM-1DP” manufactured by Suga Test Instruments Co., Ltd.
  • JIS K 7105 JIS K 7105
  • the sum of the transmission clarity of the anti-glare layer 53 can be determined by changing the type and amount of the light-transmitting fine particles used for the production of the anti-glare layer 53, and when two or more types of light-transmitting fine particles are used. It can be adjusted by changing the mixing ratio and by controlling the surface irregularities. Therefore, it is sufficient to appropriately adjust the individual elements of such values of the sum of the transmission visibility of interest are obtained.
  • the liquid crystal display device 1 may have an optical functional film having other functions.
  • Examples of such an optical functional film include a reflective polarizing film that transmits a certain kind of polarized light and reflects polarized light that shows the opposite property, a film with a diffusing function having a random uneven shape on the surface, and such deflection functional film having an uneven shape such as a prism portion and a lenticular lens in the surface.
  • An example of a commercial product corresponding to a reflective polarizing film that transmits certain types of polarized light and reflects polarized light exhibiting the opposite properties is “DBEF” (available from 3M, Sumitomo 3M Limited in Japan) Can be included).
  • Examples of commercially available products corresponding to a film with a diffusion function include “Opulse PBS series” and “Opulse BS series” (both manufactured by Eiwa Co., Ltd.).
  • Examples of commercially available products corresponding to the film with a deflection function include “BEF” (manufactured by 3M, available from Sumitomo 3M Limited in Japan).
  • Example 1 The light guide plate incorporated in Sony's 16.4-inch notebook PC VGN-FW73JGB is used in the backlight device used in the Sony-made 32-inch LCD TV KDL-32EX700 in the 32-inch LCD TV KDL-32EX700
  • the backlight device 11 of the present example was configured by replacing the light guide plate originally incorporated in the backlight device.
  • the cross-sectional shape of the light guide plate incorporated in the 16.4 type notebook PC VGN-FW73JGB was trapezoidal.
  • the light guide plate 12 used in the backlight device 11 of Example 1 was produced as follows. That is, when the light guide plate incorporated in the 16.4 type notebook PC VGN-FW73JGB manufactured by SONY is referred to as the light guide plate 121, the two light guide plates 121 and 121 correspond to the upper side of the trapezoid in the cross-sectional shape. A so-called butterfly-shaped light guide plate 12 was produced by solvent-bonding the end faces of the light guide plates 121 and 121.
  • the butterfly-shaped light guide plate 12 was replaced with the light guide plate originally incorporated in the backlight device used in the 32-inch liquid crystal television KDL-32EX700 manufactured by SONY, and the backlight device 11 of this example was produced.
  • the reflection plate incorporated in the backlight device used in the Sony-made 32-inch liquid crystal television KDL-32EX700 was a white diffusion type (white sheet) reflection sheet.
  • FIG. 4 is a diagram showing a luminance measurement method in the present embodiment.
  • the luminance measurement the luminance with the light deflection layer 16 and the light diffusion layer 9 removed was measured in order to measure the luminance of light from the surface light emitting unit 15.
  • the light-emitting surface of the backlight device 11 is a light emitting surface 15a of the surface-emitting portion 15.
  • Light emitting surface 15a of the surface-emitting portion 15 corresponds to the light emitting surface 12a of the light guide plate 12.
  • the backlight device 11 before incorporating the light deflection layer 16 and the light diffusion layer 9 (the backlight device 11 corresponding to the configuration in which the light deflection layer 16 and the light diffusion layer 9 are removed from the state of FIG. 1).
  • the backlight device 11 (backlight module) was installed upright so that the light emitting surface of () was vertical.
  • FIG. 4 shows a state before the light deflection layer 16 and the light diffusion layer 9 are incorporated in the backlight device 11. In other words, a state in which a unit in which the light source 13 is arranged with respect to the light guide plate 12 is incorporated in the housing is shown.
  • An angle formed with the normal of the light emitting surface is ⁇
  • a luminance meter 70 is installed in a direction of a predetermined angle ⁇ , and 1 cm from the center of the light emitting surface (position indicated by x in FIG. 4).
  • the brightness of the upper part was measured.
  • the reason for removing the measurement point 1 cm above the center of the light emitting surface is to prevent an abnormal value that may occur when measuring at the center of the light emitting surface.
  • the distance between the measurement point and the luminance meter 70 was set to 40 cm, and the luminance was measured in increments of 2 degrees with the measurement angle ⁇ in the range of ⁇ 74 ° to 74 °.
  • the luminance meter 70 BM-7 manufactured by TOPCON was used, and the measurement angle of the luminance meter 70 was set to 1 °.
  • the azimuth angle ⁇ was measured in four directions of 0 °, 45 °, 90 °, and 135 °, with the upward direction in FIG. 4 being 0 °.
  • FIG. 5 shows the angular distribution from the backlight device 11 measured as described above.
  • the horizontal axis in FIG. 5 is the viewing angle with respect to the direction of the normal to the light emitting surface (z-axis direction), that is, the angle (°) representing the measurement angle ⁇
  • the vertical axis is the luminance (cd / m 2 ).
  • the solid line represents an azimuth angle ⁇ of 0 °
  • the thick solid line represents an azimuth angle ⁇ of 45 ° (the thick solid line represents the case where the azimuth angle ⁇ is 90 ° on the left side of the graph in FIG. 5).
  • the dotted line partially overlaps with a broken line indicating that the azimuth angle ⁇ is 135 ° on the right side of the graph of FIG.
  • the azimuth angle ⁇ is 135 ° (partially overlapped with a thick solid line indicating the case where the azimuth angle ⁇ is 45 °).
  • the measurement result in partly overlapping with the dotted line indicating the case of 90 ° is shown.
  • the maximum luminance value when the angle ⁇ is ⁇ 40 ° to 40 ° and the maximum luminance value when the angle ⁇ is ⁇ 60 ° to ⁇ 74 ° and 60 ° to 74 ° are as follows.
  • FIG. 2 is a diagram showing the configuration of the liquid crystal display device of this embodiment.
  • the above-mentioned butterfly light guide plate is replaced with the light guide plate originally incorporated in the 32-inch liquid crystal television KDL-32EX700 in the backlight device used in the Sony-made 32-inch liquid crystal television KDL-32EX700.
  • the surface light emitting part 15 was configured.
  • the light deflecting layer 16, the light diffusing layer 9, and the liquid crystal cell device 20 of the liquid crystal television are arranged in this order from the surface light emitting unit 15 side on the light emitting surface 15a side of the surface light emitting unit 15.
  • the liquid crystal display device 1 of Example was produced.
  • the light deflection layer 16 of the backlight device 11 of Example 1 was a prism sheet.
  • the cross-sectional shape of the many prism portions 16a included in the light deflection layer 16 as the prism sheet was an isosceles triangle having an apex angle of 65 °.
  • the distance between the ridge lines of the adjacent prism portions 16a was 50 ⁇ m.
  • the light diffusion layer 9 of the backlight device 11 of Example 1 was a diffusion sheet.
  • the haze value of the light diffusion layer 9 as the diffusion sheet was 30.0%.
  • the light deflection layer 16 has the side on which the prism portion 16 a is formed facing the light source 13, and the ridge line of the prism portion 16 a is parallel to the end faces 12 b and 12 c on which the light source 13 is disposed. It was installed to become. In other words, the prism portion 16a extends in the Y-axis direction.
  • an antiglare layer having a total transmission definition of 111% obtained through optical combs of 0.125 mm, 0.5 mm, 1.0 mm and 2.0 mm Formed.
  • the antiglare layer was produced as follows. 60 parts by weight of pentaerythritol triacrylate and 40 parts by weight of polyfunctional urethanized acrylate (reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate) are mixed in a propylene glycol monomethyl ether solution so that the solid content concentration becomes 60% by weight. To obtain an ultraviolet curable resin composition.
  • polystyrene particles having a weight average particle diameter of 3.0 ⁇ m and a standard deviation of 0.39 ⁇ m as first light-transmitting fine particles
  • a light-transmitting fine particle polystyrene particles having a weight average particle diameter of 7.2 ⁇ m and a standard deviation of 0.73 ⁇ m, a total of 40 parts by weight, and a photopolymerization initiator “Lucirin TPO” (manufactured by BASF, 5 parts by weight of 2,4,6-trimethylbenzoyldiphenylphosphine oxide) was added, and propylene glycol monomethyl ether was added so that the solid content was 60% by weight to prepare a coating solution.
  • Lucirin TPO manufactured by BASF, 5 parts by weight of 2,4,6-trimethylbenzoyldiphenylphosphine oxide
  • This coating solution is applied onto a 80 ⁇ m-thick triacetyl cellulose (TAC) film (base film), dried in a dryer set at 80 ° C. for 1 minute, irradiated with a high-pressure mercury lamp, and irradiated with ultraviolet light.
  • TAC triacetyl cellulose
  • the curable resin composition layer was cured to obtain a light diffusion film.
  • the value of the sum of transmission clarity was adjusted by controlling the mixing ratio of the first and second light-transmitting fine particles and the surface roughness.
  • the ⁇ curve was measured.
  • the ⁇ curve shows the relationship between gradation (input value) and output luminance.
  • the curve showing the relationship between the gradation (0 to 125) and the output luminance (cd / m 2 ) is the ⁇ curve.
  • the method of measuring the luminance when measuring the ⁇ curve is the same as the method of measuring the luminance, except for the following points. That is, in the luminance measurement, as shown in FIG.
  • the backlight device 11 before the light deflection layer 16 and the light diffusion layer 9 are incorporated (the configuration in which the light deflection layer 16 and the light diffusion layer 9 are removed from the state of FIG. 1).
  • the backlight device 11 (backlight module) is installed upright so that the light emitting surface of the backlight device 11) corresponding to the above is vertical, whereas in the luminance measurement method when measuring the ⁇ curve, FIG.
  • the liquid crystal display device 1 is arranged so that the light emitting surface 1a (the exit surface of the antiglare layer 53) of the liquid crystal display device 1 incorporating the light deflection layer 16, the light diffusing layer 9, and the liquid crystal cell device 20 is vertical. Installed upright.
  • the angle formed with the normal of the light emitting surface (the angle formed with the Z-axis direction) is ⁇ , and a color luminance meter 80 is installed in the direction of the predetermined angle ⁇ .
  • ⁇ curve was measured.
  • the reason for setting the measurement point 1 cm above the center of the light emitting surface is to prevent an abnormal value that may occur when measuring at the center of the light emitting surface.
  • the distance between the measurement point and the color luminance meter 80 was set to 40 cm, and the ⁇ curve was measured in two directions of the measurement angle ⁇ of 0 ° and 60 °.
  • the color luminance meter 80 was a BM-5AS manufactured by TOPCON, and the measurement angle of the color luminance meter 80 was set to 1 °.
  • the azimuth angle ⁇ was measured in four directions of 0 °, 45 °, 90 °, and 135 °, with the upper direction in FIG. 6 being 0 °.
  • the area surrounded by the ⁇ curve with the measurement angle of 0 ° and the 60 ° ⁇ curve measured above was defined as the ⁇ curve area.
  • the ⁇ curve area here is indicated by the product of gradation and luminance (normalized value). It can be said that the smaller the value of the ⁇ curve area, the more the liquid crystal display device is suppressed from changing due to the viewing angle of the ⁇ curve. That is, it can be said that the liquid crystal display device 1 having a smaller area of the ⁇ curve area has better display characteristics.
  • the ⁇ curve area at this time is shown in Table 1 below.
  • Example 1 A glare-proof layer having a sum of transmission clarity of 320% obtained through optical combs of 0.125 mm, 0.5 mm, 1.0 mm and 2.0 mm is provided on the surface of the emission surface of the liquid crystal cell device 20 of the liquid crystal display device 1. Except for the points formed, the ⁇ curve area was determined in the same manner as in Example 1. Similar to the first embodiment, the ⁇ curve area is represented by the product of gradation and luminance.
  • the antiglare layer having a transmission transparency sum of 320% was formed in the same manner as the antiglare layer used in Example 1.
  • liquid crystal display devices of the above embodiment and the above examples can be simply configured, they are extremely useful industrially. This liquid crystal display device rarely causes gradation inversion. This liquid crystal display device is a display with high contrast and good visibility.
  • the surface light emitting unit may satisfy the predetermined condition described above at the four azimuth angles ⁇ 1 to ⁇ 4 as described above.
  • the above conditions may be adjusted by the configuration of the light guide plate 12 or may be adjusted by the reflection state of the reflection plate 14.
  • Surface emitting part 15, the other at least one optical sheet on the light guide plate 12 may be disposed.
  • the light emitting surface of the optical sheet closest to the light deflection layer 16 side among the other optical sheets on the light guide plate 12 is the light emitting surface of the backlight device at the time of luminance measurement described with reference to FIG. It is.
  • the said predetermined conditions may be satisfy
  • DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 1a ... Light-emitting surface, 9 ... Light-diffusion layer, 11 ... Backlight apparatus, 12 ... Light guide plate, 12a ... Light-emitting surface, 12b, 12c ... End surface, 13 ... Light source, 14 ... Reflector plate, 15 DESCRIPTION OF SYMBOLS ... Surface emitting part, 15a ... Light emission surface, 16 ... Light deflection layer, 16a ... Prism part, 16b ... Vertex, 20 ... Liquid crystal cell device, 21 ... Liquid crystal cell, 22a, 22b ... Transparent substrate, 23 ... Liquid crystal layer, 41 DESCRIPTION OF SYMBOLS ... Polarizing plate, 52 ... Polarizing plate, 53 ... Anti-glare layer, 70 ... Luminance meter, 80 ... Color luminance meter, 121 ... Light guide plate.

Abstract

L'invention concerne un dispositif (1) d'affichage à cristaux liquides muni d'un dispositif (11) de rétro-éclairage, doté d'une unité plane (15) émettrice de lumière et d'une couche (16) de polarisation de lumière, et d'une cellule (21) à cristaux liquides. Concernant la luminosité sur la surface de sortie de lumière servant à la sortie de la lumière, la luminosité pour toute une gamme d'angles de vision allant de -40° à +40° dans l'ensemble des premier à quatrième angles d'azimut est inférieure ou égale à 40% de la valeur maximale parmi les luminosités dans une gamme d'angles de vision allant de -60° à -74° et de +60° à +74° dans l'ensemble des premier à quatrième angles d'azimut, lesdits premier à quatrième angles d'azimut se situant dans un plan orthogonal à une première direction allant de l'unité émettrice de lumière en surface vers la couche de polarisation de lumière. La somme des clartés de transmission pour une couche antireflet obtenue par un passage à travers des peignes optiques présentant une largeur de peigne de 0,125 mm, 0,5 mm, 1,0 mm et 2,0 mm est comprise entre 70% et 300%.
PCT/JP2012/082824 2011-12-27 2012-12-18 Dispositif d'affichage à cristaux liquides WO2013099708A1 (fr)

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KR102053703B1 (ko) * 2014-03-28 2019-12-09 동우 화인켐 주식회사 광확산 방현필름용 조성물 및 이를 이용한 광확산 방현필름
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JP2007249181A (ja) * 2006-02-17 2007-09-27 Sharp Corp 表示装置
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