WO2008032775A1 - Élément de source de lumière planaire, élément de commande de lumière utilisé pour l'élément de source de lumière planaire et dispositif d'affichage d'images utilisant l'élément de source de lumière planaire - Google Patents

Élément de source de lumière planaire, élément de commande de lumière utilisé pour l'élément de source de lumière planaire et dispositif d'affichage d'images utilisant l'élément de source de lumière planaire Download PDF

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Publication number
WO2008032775A1
WO2008032775A1 PCT/JP2007/067820 JP2007067820W WO2008032775A1 WO 2008032775 A1 WO2008032775 A1 WO 2008032775A1 JP 2007067820 W JP2007067820 W JP 2007067820W WO 2008032775 A1 WO2008032775 A1 WO 2008032775A1
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WO
WIPO (PCT)
Prior art keywords
light
axis
guide plate
light source
light guide
Prior art date
Application number
PCT/JP2007/067820
Other languages
English (en)
Japanese (ja)
Inventor
Seiji Kinoshita
Original Assignee
Kuraray Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kuraray Co., Ltd. filed Critical Kuraray Co., Ltd.
Priority to JP2007544660A priority Critical patent/JPWO2008032775A1/ja
Publication of WO2008032775A1 publication Critical patent/WO2008032775A1/fr

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Classifications

    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the present invention relates to an edge light type surface light source element, a light control member used therefor, and an image display device using the same.
  • edge light type surface light source element has a linear light source on the side surface of the light guide plate. Compared with the surface light source element of the system, it has the feature that it is effective in reducing the thickness, and it is widely used as a display unit for portable notebook computers and monitors.
  • a light guide plate having a main surface of a generally rectangular shape made of a transparent resin or the like is used.
  • This light guide plate has an incident end surface on which a primary light source such as a linear light source or a point light source is disposed between an output surface that is one of the main surfaces and a bottom surface that is another main surface facing the output surface. Have it.
  • the light emitted from the primary light source enters the light guide plate from the incident end face of the light guide plate, and is guided through the light guide plate or scattered by scattering dots (white dots) provided on the bottom surface of the light guide plate. Or after being emitted from the bottom surface of the light guide plate and scattered by a reflective sheet having a reflective surface facing the bottom surface and incident again on the light guide plate, the liquid crystal display element is emitted from the output surface. It is emitted toward the part.
  • the luminance distribution in the viewing direction becomes uniform by adjusting the size, density, etc. of the dots. It has been adjusted. Thereby, the light emitted from the primary light source enters the light guide plate from the incident end face, and the incident light is emitted from the emission surface toward the liquid crystal display element while being guided through the light guide plate.
  • the surface light source element using such a printed dot type light guide plate uses light scattering at the scattering dots, the light emitted from the light guide plate exhibits a light distribution distributed over a wide angle.
  • the orientation and brightness in the front direction which are important as a surface light source element cannot be obtained sufficiently. Therefore,
  • a prism sheet directional sheet is also used. Yes.
  • the diffusion sheet is formed by applying a liquid in which diffusible fine particles are dispersed on one side or both sides of the sheet, or by molding a resin in which fine particles are dispersed into a sheet shape. This is a sheet in which light incident on the sheet is diffused by diffusing fine particles dispersed randomly.
  • the prism sheet can increase the front luminance more efficiently.
  • the light emitted from the prism sheet generally has a sharply lower brightness near 30 ° and a higher brightness region at 50 ° or higher, which is a preferable image quality.
  • There are problems such as low power, low power, and low energy efficiency.
  • Patent Document 1 a protrusion (or groove groove IJ) that is perpendicular to or inclined with respect to the incident end face is disposed on the exit surface, and printed dots are formed on the bottom surface facing the exit surface.
  • a light guide plate with embossed dots has been proposed. In such a light guide plate, the light introduced into the light guide plate is guided to the back of the light guide plate, so that the prism sheet for the lower laying is installed so that the groove row is perpendicular to the incident end surface. (Directional sheet) can be omitted.
  • two prism sheets can be omitted by intersecting the above-mentioned ridges (or groove grooves IJ).
  • Patent Documents 2 and 3 disclose a prism optical element integrated light guide plate.
  • Such a prism optical element integrated light guide plate has a V-shaped groove array in a direction intersecting with each of the emission surface and the bottom surface. As a result, the light incident from the incident end surface is taken into the bottom surface and the reflected light is efficiently reflected in the direction of the exit surface. Further, when the light is emitted from the emission surface via the prism formed on the emission surface, incident light incident in a direction perpendicular to the incident end surface can be emitted at an angle perpendicular to or close to the emission surface.
  • Patent Document 4 discloses a ridge and a concave shape alternately arranged at a predetermined pitch.
  • a light guide plate is disclosed in which the pattern is arranged perpendicularly to the output surface and the bottom surface. According to such a light guide plate, the use of a directional sheet such as a prism sheet can be omitted as much as possible, and the vertical direction can be reduced. A light guide plate that can ensure a viewing angle without reducing luminance can be provided.
  • Patent Document 1 Japanese Patent Application Publication No. 9 61631 (Figs. 6, 8 and paragraph 0038)
  • Patent Document 2 Japanese Patent Application Publication No. 10-282342
  • Patent Document 3 Japanese Patent Application Publication No. 2003-114432
  • Patent Document 4 WO / 2006/013969
  • the ridges or ridges formed on the exit surface and the bottom surface are V-shaped groove rows having apex angles of acute angles. is there.
  • the edge light type surface light source element using the prism optical element integrated light guide plate having such V-shaped groove rows it is difficult to emit light in the vertical direction (normal direction).
  • the viewing angle was narrowed.
  • the brightness of the brightness is prominent. Therefore, when the corner of the rectangular light guide plate that is only noticeable with glare on the surface is viewed obliquely, a dark line is visible.
  • a dark line is visible.
  • trapezoidal ridges and trapezoidal ridges are alternately arranged on at least one of the exit surface and the bottom surface, thereby vertically The ability to secure a certain viewing angle while improving the brightness of the direction further improvement is desired
  • an object of the present invention is to provide a surface light source element and an image display device capable of improving the luminance in the front direction and increasing the viewing angle.
  • An object is to provide a light control member used for such a surface light source element.
  • the present invention is an edge light type surface light source element in which at least one linear light source is arranged on at least one side surface of a light guide plate, the light guide plate having an emission surface, a bottom surface facing the emission surface, And an incident end face on which light emitted from the linear light source is incident, and includes a reflecting means for reflecting light on the bottom surface side of the light guide plate, and the light guide plate on the output surface side of the light guide plate.
  • the linear light source is an X-Y plane normal line consisting of an X axis and a Y axis perpendicular to the X axis.
  • the reflecting means, the light guide plate, and the light control member are arranged parallel to the XY plane, and the reflecting means, the light guide plate, and the light are arranged in the Z-axis direction.
  • the light guide plate has an incident end surface parallel to the X axis, and the light exit plate and the light emitting plate.
  • a ridge pattern is formed on the bottom surface, the pattern formed on the emission surface is parallel to the Y axis, the pattern formed on the bottom surface is parallel to the X axis, and the light control member
  • a plurality of bowl-shaped projections parallel to the X-axis are formed on the side from which the light exits, and the contour line of the cross-section of the projection parallel to the Y-z plane composed of the Y-axis and the z-axis is It has a curved part including at least the apex part, and the following formulas respectively in the range of monotonically increasing in both directions centered on the apex of the convex part, the inclination ⁇ force s where the tangent to the contour line intersects the Y axis It is a surface light source element characterized by satisfying
  • the present invention is the above-described surface light source element, wherein the cross-sectional shape of the convex portion of the light control member is a partial ellipse formed of a part of an ellipse whose vertex is one end of the major axis of the ellipse.
  • the maximum value of the inclination of the tangent line of the partial ellipse shape with respect to the vertical axis is in the range of 60 degrees to 80 degrees, and the height h with respect to the width ⁇ in the direction parallel to the vertical axis of the partial elliptic shape is 2.
  • the present invention is the surface light source element described above, wherein the convex portion of the light control member is a portion formed of a part of a parabola including a cross-sectional shape force S in the Y-Z plane and a vertex of the parabola.
  • the parabola-shaped tangent line has a maximum inclination with respect to the Y axis in the range of 52 to 62 degrees, and the height h of the partial parabola shape with respect to the width p in the direction parallel to the Y axis.
  • an aspect ratio as a ratio is in a range of 0.32 force, and 0.47.
  • the present invention is the above-described surface light source element, wherein the cross section in the X-Z plane constituted by the X-axis and the Z-axis of the pattern on the exit surface side of the light guide plate is the X-axis.
  • the trapezoidal ridge having a parallel upper base and two oblique sides connected to the upper base, and the trapezoidal height force Sl ⁇ m ⁇ ; within the range of 100 m, with respect to the X axis of the oblique side Inclination angular force is in the range of 15 ° to 70 °, the width of the upper base is in the range of 1 ⁇ m to 500 ⁇ m, and the cross section in the Y-Z plane of the pattern on the bottom surface of the light guide plate is the Y axis Is formed in a trapezoidal ridge having an upper base parallel to the upper base and two oblique sides connected to the upper base, the height of the trapezoid is within a range of 1 m to 100 m, with respect to the Y axis of the oblique side Inclination angular force 3 ⁇ 42.
  • a surface light source element characterized in that the width of the upper base is within the range of 5 ° to 45 ° and the width of
  • the present invention is a light control member used for the surface light source element.
  • the present invention is an image display device comprising a transmissive display element on the exit surface side of the light control member of the surface light source element.
  • the luminance in the front direction is improved and the viewing angle is increased.
  • a surface light source element and an image display device can be provided.
  • FIG. 1 is an exploded schematic diagram before assembling a light control sheet of a surface light source element of the present invention, and a diagram for explaining a cross-sectional shape of a hook-shaped convex portion protruding from an emission surface of the light control sheet. .
  • FIG. 2 is a schematic view showing an example of a surface light source element of the present invention.
  • FIG. 3 is a schematic diagram for explaining a trapezoidal shape formed as a pattern on the exit surface and bottom surface of a light guide plate used in the surface light source element of the present invention.
  • FIG. 4 is a configuration diagram showing a surface light source element of the present invention.
  • FIG. 5 is a configuration diagram showing a surface light source element of the present invention.
  • FIG. 6 is an angular luminance distribution of outgoing light in the vertical direction from the light guide plate provided in the surface light source element of the present invention.
  • FIG. 7 is a diagram showing a traveling direction of a part of light incident parallel to the normal of the incident surface of the light control sheet.
  • FIG. 8 is a diagram showing a traveling direction of a part of light incident obliquely with respect to the normal of the incident surface of the light control sheet.
  • FIG. 9 is an angular luminance distribution diagram in the vertical direction of light emitted from the surface light source element of the present invention.
  • FIG. 10 is an angular luminance distribution diagram of light emitted in the horizontal direction from the light guide plate provided in the surface light source element of the present invention.
  • FIG. 11 is an angular luminance distribution diagram in the horizontal direction of light emitted from the surface light source element of the present invention.
  • FIG. 12 is a diagram for explaining the surface characteristics of trapezoidal ridges protruding from the light exit surface of the light guide plate provided in the surface light source element of the present invention.
  • FIG. 13 is a configuration diagram in the case where a diffusion sheet ⁇ and a light control sheet ⁇ are mounted on the exit surface of the light guide plate to which printed dots are applied.
  • FIG. 14 is an angular luminance distribution diagram of emitted light in the vertical direction of a surface light source element in which a diffusion sheet and a prism sheet are placed on a light guide plate subjected to white dot printing.
  • the surface light source element 10 of the present invention includes a light guide plate 1 that is a flat (panel-like) transparent structure formed of a transparent resin or the like, and the light guide plate. 1 as a light control member formed of a primary light source 4 disposed on one side surface, a reflection sheet 5 disposed on the lower surface of the light guide plate 1, and a transparent resin disposed on the upper surface of the light guide plate 1.
  • the light guide plate 1 has an incident end face 8 parallel to the X axis, with the normal of the X—Y plane composed of the Y axis orthogonal to the X axis as the Z axis.
  • the primary light source 4 is disposed parallel to the incident end face 8 of the light guide plate 1 and light incident from the incident end face 8 is transmitted through the light guide plate 1 in parallel with the X-Y plane. 1 is emitted from the exit surface 6, passes through the light control sheet 11, and exits in the Z-axis direction.
  • the light control member may be supported by the light guide plate.
  • a mechanism for fixing the light control member becomes unnecessary, and since the light control member is not fixed, the stress generated in the light control member due to the heat of the device is not concentrated on the fixing part, and the light control member is damaged or significantly deformed. Can be suppressed. Furthermore, even if the light control member is made thin, it is supported by the light guide plate, so that the occurrence of deflection is unlikely to occur.
  • the light guide plate used in the present invention is used for an edge-light type surface light source element, so that a wide viewing angle characteristic is maintained while maintaining a wide viewing angle characteristic by the convex pattern on the output surface and the convex pattern on the bottom surface facing the output surface. /, Has a function to get the brightness!
  • the light guide plate 1 used in the present invention can be composed of a transparent resin having a high light transmittance.
  • a transparent resin for example, a methacrylic resin, an acrylic resin, a polycarbonate resin, a polyester resin, a cyclic polyolefin resin, or the like can be widely used.
  • one surface of the light guide plate 1 is an emission surface 6, and a bottom surface 7 is disposed opposite to the emission surface 6.
  • a primary light source 4 is disposed on at least one side surface of the light guide plate 1, and this side surface serves as an incident end surface 8.
  • the incident end face 8 may be at least one place as shown in the figure.
  • the reflecting end face 8a is formed on the side face other than the incident end face 8.
  • a typical example of the case where the incident end face 8 has two power stations is an example in which there are linear light sources as primary light sources on opposite faces, as shown in the embodiments described later, and the reflection end faces are on both side faces. It is formed.
  • the incident end face 8 of the two power stations must satisfy the condition that both are orthogonal to the pattern formed on the exit face 6 and parallel to the pattern formed on the bottom face 7.
  • a primary light source is disposed toward the incident end face 8. Any linear light source may be used as such a primary light source. However, a linear light source (line light source) in which a large number of point light sources such as a linear light source and an LED light source are arranged. Light source)!
  • the patterns of the ridges 2 and 9 formed at a predetermined pitch are formed orthogonal to each other on both the exit surface 6 and the bottom surface 7 of the light guide plate.
  • the ridges 2 and 9 include the trapezoidal ridges 2 and 9 described below, and are substantially the same or equivalent to the ridges 2 and 9 used in the conventional surface light source element. May be.
  • These ridges 2 and 9 are formed by projecting (projecting) portions having a projecting cross section extending in one direction.
  • the cross-sectional shape of these ridges may be a desired shape such as a triangle, a wedge, another polygon, a wave, or a semi-ellipse.
  • the ridges 2 formed on the exit surface 6 may be arranged with a uniform pitch and shape, but the ridges 9 formed on the bottom surface 7 are pitched away from the primary light source.
  • the ridges may be arranged narrowed, or the height of the ridges may gradually increase with distance from the light source.
  • Such a configuration with gradually different shapes includes, for example, a case where the cross section is provided with a trapezoidal ridge and the length of the upper base and / or the lower base of the trapezoid is gradually different.
  • the light power refracted using the bottom surface 7 and the reflection sheet 5 is used to control the structure of the bottom surface 7 so that the light is emitted from the light exit surface 6 with a desired intensity. It is performed in combination with each other or in combination with other adjustment means.
  • the front luminance in the viewing direction is further improved.
  • the viewing angle characteristic becomes high and the viewing angle characteristic becomes wide.
  • the trapezoidal ridges 2 and 9 are ridges extending in the longitudinal direction provided in a trapezoidal shape on the surface side from the light guide plate.
  • the convex strips 2 and 9 having a symbol A, B, C, and D as the vertices and the symbol A ' , B ′, C ′, and D ′ are arranged so as to be spaced apart from the convex strips 2 ′ and 9 ′ having trapezoidal cross sections.
  • the trapezoidal shape according to the present invention is not limited to a trapezoid in a strict sense as shown in the drawings.
  • the upper and lower bases which are planes having different heights parallel to the XY plane, are continuous across a slope that connects in a mountain shape, for example, the upper base or
  • the connecting portion between the lower base and the slope may be curved.
  • Such a trapezoidal shape having a curved connecting portion is preferable because it is relatively easy to mold and is advantageous in production, and the connecting portion is not easily damaged.
  • at least a part of the upper and lower bases may be inclined with respect to the XY plane.
  • the upper and / or lower bases are gently wavy with the X-axis direction as the longitudinal direction.
  • the uniformity of light emission can be improved by having fine irregularities.
  • the average of the inclinations preferably has no angle with respect to the XY plane.
  • the center of gravity of the light guide plate can be stabilized only by being able to guide light efficiently.
  • there are practically useful effects such as facilitating industrially advantageous continuous production in extrusion molding and the like.
  • the pitch P is equal to the sum of the width of the lower base of the ridge 2 (the length of the straight line AD) W1 and the width W3 of the upper base 3a of the ridge 3 and the width of the upper base 2a of the ridge 2 (straight line BC Length) W2 and concave 3 It is equal to the sum of the width of the bottom base (length of straight line BC ').
  • the protrusion 2 is incident from the incident end face 8 by providing a trapezoidal cross section and providing the protrusion 2 with an appropriate width W2. While taking the role of guiding light to the center of the light guide plate, the brightness in the vertical direction (normal direction) perpendicular to the exit surface 6 in the brightness distribution emitted from the exit surface 6 is increased.
  • the cross-sectional shape of the recess 3 is trapezoidal, and the recess 3 is provided with a desired width W3.
  • the light incident from the incident end face 8 plays a role of guiding the inside of the light guide plate along the Y-axis direction, and the vertical direction perpendicular to the exit face 6 (normal line) in the brightness distribution of the exit face 6 force. Direction) brightness.
  • width W2 is too narrow and the contribution of the inclined surfaces 2b and 2c becomes too large, it is difficult to sufficiently exhibit the effect of increasing the luminance in the vertical direction.
  • the width W2 and / or the width W3 are set to be relatively wide with respect to the inclined surfaces 2b and 2c, the contribution of the inclined surfaces 2b and 2c becomes relatively small.
  • the brightness in the vertical direction can be improved, the viewing angle becomes narrow, the directivity sheet is omitted as much as possible, and the problem that the viewing angle can be secured without reducing the brightness in the vertical direction cannot be sufficiently satisfied.
  • the shape and size of the ridges 2 or 3 and the pitch P are the size of the light guide plate 1 and the display of the surface light source element 10. Determined considering the relationship with performance and specifications. As a result, the brightness of the light emitted from the light exit surface 6 of the light guide plate 1 can be kept moderate and an appropriate viewing angle can be obtained.
  • the general height H of such ridges 2 is selected from the range of 1 m to 100 m, and a more preferable height H is 5 ⁇ m to 50 ⁇ m. m, the most preferred height H is selected from the range of 10 ⁇ m to 30 ⁇ .
  • the general inclination angle al and the inclination angle a2 are each selected from the range of 15 ° to 70 °, and the more preferable inclination angle al and the inclination angle a2 are each selected from the range of 15 ° to 60 °. Is done. In particular, 15 ° to 35 ° is selected as the most preferable range when viewing angle characteristics are important, and 35 ° to 60 ° is selected as the most preferable range when luminance characteristics are important. It is.
  • the general width of the lower base is in the range of 10 111 to 500 111, more preferably in the range of 15 mm to 270 ⁇ m, and most preferably in the range of 15 m to 180 ⁇ m. A force within the range is also selected.
  • the width of the upper base ⁇ 2 is selected from the range of 1 111 to 500 111, and the more preferable width W2 is in the range of 1 ⁇ m to 100 ⁇ m, most preferably 5 ⁇ m to 50 ⁇ m. m in-range force, selected
  • the general width W3 is selected from the range of 0.1 ⁇ m to 500 ⁇ m, and the more preferable width W3 is within the range of 0.1 ⁇ m to 300 ⁇ m, most preferably 1 ⁇ m. A force within the range of ⁇ 150 ⁇ m is selected.
  • the exit surface 6 of the light guide plate 1 has a trapezoidal pattern in which the widths Wl, W2, and W3 are formed at a specific ratio in relation to the pitch P! / Is preferred.
  • the ratio of the width W3 of the upper base formed in the concave strip 3 to the width W2 of the upper base formed in the convex strip 2 (W3 / W2) is in the range of 0.0 ;! to 200 ⁇ preferably, more preferably (or 0.02 to; in the range of 100, most preferably in the range of 0.;! To 10).
  • the ratio of (P—W2—W3) to (W2 + W3) is preferably in the range of 0.04 to 400, more preferably (or in the range of 0.2 to 200, most preferably ( From 0.3 to 150;
  • the luminance of light emitted from the exit surface 6 of the light guide plate 1 is maintained by maintaining the ratio of W3 to W2 within these ranges. It is easy to set conditions for maintaining an appropriate viewing angle and obtaining an appropriate viewing angle.
  • a convex strip having a trapezoidal cross section is provided on the bottom surface 7 of the light guide plate 1 provided in the surface light source element of the present invention.
  • the ridge 9 and the ridge 9 ′ are arranged in parallel to the incident end face 8 with W3 being 0 and in contact with each other.
  • the cross-sectional shape of the trapezoidal protrusion 9 formed on the bottom surface 7 of the light guide plate 1 is preferably set such that the inclination angle al and the inclination angle a2 are within a range of 32.5 ° to 45 °, More preferably, it is set within the range of 35 ° to 45 °, and most preferably within the range of 37.5 ° to 42.5 °.
  • the height is preferably set within a range of 1 ⁇ m to 100 ⁇ m, more preferably within a range of 5 ⁇ m to 50 ⁇ m, and most preferably within a range of 10 m to 20 m.
  • the width of the upper base is preferably set in the range of 3 mm to 1600 mm, more preferably in the range of 10 mm to 800 mm, most preferably in the range of 15 m to 350 11 m
  • the width of the lower base is preferably set in the range from 6 am to 1800 am, more preferably from 15 ⁇ m to; in the range from 1000 ⁇ m, most preferably from 25 ⁇ m to 400 ⁇ m Set within the range.
  • the light control member 11 of the present invention has a function of widening the viewing angle in the horizontal direction of the light emitted from the light guide plate 1, narrowing the viewing angle in the vertical direction, and directing it to the front.
  • the light control member 11 is formed into a flat plate shape such as a sheet shape, a film shape, or a panel shape using a transparent resin or the like, and is one surface side (outgoing surface) of the main body 14.
  • Each has a specific bowl-shaped convex portion 15 formed at a predetermined pitch.
  • the saddle-like convex portion 15 is a convex pattern extending parallel to the X axis, and a contour line 15a of a cross section parallel to the Y-Z plane has a curved portion including at least the top portion.
  • the hook-shaped convex part is elongated and swelled on a straight line.
  • the contour 15a monotonously increases in both directions centered on the vertex of the convex portion, the angle ⁇ between the tangent line in the Y-Z plane and the Y axis.
  • the angle ⁇ between the tangent line in the Y-Z plane and the Y axis.
  • Ymax is the monotonically increasing angle from the origin.
  • the position in the Y-axis direction (the distance from the origin to the Y-axis) when ⁇ takes ⁇ max, that is, the slope of the tangent of contour line 15a at Ymax is ⁇ . m ax.
  • ⁇ ' is the contour 15a at ⁇ ' when ⁇ 'is 1/2 of Ymax.
  • Ymax is the distance from the origin to the inflection point, and the slope at that position is ⁇ max.
  • the position Ymax force is always 1/4 of the pitch p, that is, outside of one half of the contour 15a. Is shown. Thereby, for example, a light control sheet (prism sheet) in which only the top portion is formed round is excluded.
  • drawing is a diagram for explanation and shows an inflection point in the drawing, but this inflection point may not be provided as in an embodiment described later.
  • edge light type light guide plate having a pattern of protruding ridges orthogonal to each other on the exit surface and the bottom surface facing the exit surface, and a specific hook-shaped convex portion on the exit side on the exit surface side of the light guide plate.
  • FIG. 6 shows the angular luminance distribution of the emitted light in the vertical direction (Y-axis direction) from the light guide plate provided in the surface light source element of the present invention. That is, FIG. 6 is an angle distribution diagram of outgoing light emitted from the outgoing surface 6 when the light control sheet indicated by reference numeral 11 in FIG. 1 is not provided.
  • the light emitted from the light guide plate 1 shows a distribution with many outgoing components in the front direction and around 45 °.
  • FIG. 7 shows a traveling direction of a part of the light 12 a incident parallel to the normal line of the incident surface 11 a of the light control sheet 11.
  • a part of the light 12a incident parallel to the normal of the incident surface 11a of the light control sheet 11 is transmitted through the incident surface and refracted by the convex curved surface 15a, as indicated by reference numeral 13A.
  • the light is emitted in the vicinity of the front direction.
  • FIG. 8 shows a traveling direction of a part of the light 12b incident from an oblique direction (near 45 °) with respect to the normal line of the incident surface 11a of the light control sheet 11.
  • the light control sheet 1 Part of the light 12b incident obliquely with respect to the normal line of the incident surface 11a of 1 is refracted by the incident surface 11a and the convex curved surface 15a, and is emitted near the front direction as indicated by reference numeral 13B.
  • the part is totally reflected and returns to the light guide plate 1 again as indicated by reference numeral 13C.
  • the light guide plate 1 force that spreads in the vicinity of 45 ° in the vertical direction (Y-axis direction), the emitted light thereof is narrowed toward the front direction, and the light guide plate toward the front direction
  • the light emitted from 1 is emitted in the front direction as it is, which leads to efficient luminance improvement.
  • FIG. 9 shows the angular luminance distribution in the vertical direction (Y-axis direction) of the light emitted from the surface light source element of the present invention that has passed through the light control sheet 11 in this way.
  • FIG. 10 shows the angular luminance distribution of the emitted light in the horizontal direction (X-axis direction) from the light guide plate provided in the surface light source element of the present invention.
  • the light emitted from the light guide plate included in the surface light source element of the present invention has a distribution with a large amount of outgoing components in the front direction.
  • the surface light source element of the present invention When the surface light source element of the present invention is installed such that the convex portions of the light control sheet are arranged in parallel to the X-axis direction and the X-axis is in the horizontal direction, the light emitted from the light guide plate is light-controlled. The light is refracted by the incident surface and the convex curved surface of the sheet, and the angular luminance distribution in the horizontal direction is emitted in a direction that is more dispersed with respect to the front direction. For this reason, when the light control member according to the present invention is disposed on the light exit surface side of the light guide plate in addition to the light guide plate according to the present invention, the horizontal viewing angle is widened and the viewing angle characteristics can be improved.
  • Fig. 11 shows the angular luminance distribution in the horizontal direction of the light emitted from the surface light source element of the present invention.
  • the light guide plate used in the present invention is used for an edge-light type surface light source element, and maintains a wide viewing angle characteristic by the pattern of the projections on the exit surface and the projections on the bottom surface facing the exit surface. However, it has a function to obtain high brightness!
  • the light control sheet supported by the light guide plate has a convex portion on the exit surface, and when at least one incident end surface of the light guide plate is installed parallel to the X axis, the light control sheet has a convex shape.
  • the part is arranged parallel to the X-axis. If the X-axis direction is the horizontal direction and the Y-axis direction orthogonal to the X-axis is the upper and lower direction, the horizontal viewing angle of the light emitted from the light guide plate is increased. It has the function of widening, narrowing the viewing angle in the upper and lower directions, and directing it to the front!
  • a light guide plate having a trapezoidal convex portion and a light control sheet makes it possible to absorb or eliminate light. As light emission in any direction is reduced, light utilization efficiency can be improved and energy saving can be realized.
  • the light guide plate provided in the surface light source element of the present invention changes the direction of the incident light from the primary light source in the direction of the exit surface and the exit surface from the exit surface by the convex stripe pattern disposed on the bottom surface facing the exit surface.
  • the amount of light emitted is controlled, and the light output distribution is controlled by the convex stripe pattern on the exit surface.
  • the convex part of the light control sheet can efficiently direct the light emitted from the light guide plate to the front, so that high front luminance can be obtained.
  • the light emitted from the light control sheet has a distribution in which the luminance decreases monotonously as the angle increases from the front to the oblique direction, and the convex shape of the light control sheet is a smooth curved surface, so that scratches are present. It is hard to enter. Therefore, it is possible to correct the luminance distribution of the emitted light and to reduce the scratches and prevent the need to arrange the diffusion sheet on the light emitting surface side of the light control sheet, thereby enabling high production efficiency and low cost.
  • the convex portions of the light control sheet according to the present invention are arranged in parallel to the X axis, and light in the Y axis direction can be deflected to the front surface of the diaphragm and parallel to the X axis. It has the function of widening the light in the direction.
  • the convex portion of the light control sheet that satisfies such a condition is parallel to the X-axis direction and is composed of the Y-axis and the axis. It is necessary to have a smooth curved surface with a range that monotonously increases in both directions centered on the apex of the slope ⁇ force convex. As a result, the angle of the light that is refracted and emitted is dispersed in the vicinity of the front surface, and a smooth angular luminance distribution of the emitted light in which the luminance decreases monotonously from the front direction to the oblique direction is obtained. In addition, since the top has a curved surface, it is possible to obtain high productivity without requiring a diffusion sheet to prevent the top from being scratched.
  • the cross-sectional shape of the convex portion of the light control sheet parallel to the X-axis direction and parallel to the Y-Z plane composed of the Y-axis and the Z-axis has one end of the long axis of the ellipse.
  • the partial ellipse shape consists of a part of the ellipse as the apex, and the absolute value of the inclination of the tangent of the partial ellipse shape with respect to the Y axis is within the range of 60 ° force and 80 °, obliquely incident light is It is possible to obtain an angle distribution with smooth brightness in which the brightness decreases on the wide angle side.
  • the aspect ratio which is the ratio of the height h to the width P parallel to the Y-axis of the partial ellipse shape, is determined by the maximum value of the tangent slope of the partial ellipse shape and the aspect ratio at the top of the convex portion.
  • the cross-sectional shape of the convex portion parallel to the X-axis direction of the convex portion of the light control sheet and composed of the Y-axis and the Z-axis is parallel to the Y-Z plane.
  • the partial parabola shape consists of a part and the maximum inclination of the tangent of the partial parabola shape with respect to the Y-axis is within the range of 52 ° to 62 °, more light incident in an oblique direction is front-facing. It can be deflected in the direction.
  • the aspect ratio of the partial parabolic shape to the width p parallel to the Y-axis is determined by the maximum value of the tangent slope of the partial parabolic shape, and the maximum value of the slope is within the range of 52 ° force 62 °. This ratio is in the range of 0.32 force, et al.
  • the light control sheet of the present invention is capable of efficiently increasing the front luminance of the surface light source element of the present invention. Furthermore, compared to the prism sheet, the convex portion is hard to be damaged, and a smooth light output distribution is obtained.
  • the ridge-shaped convex portion provided on the exit surface of the light control sheet is 0.45 ⁇ max ⁇ ⁇ ' ⁇ 0.70 ⁇ max. In this case, light can be deflected more effectively in the front direction, and high front luminance can be obtained.
  • the cross-sectional shape of the convex portion of the light control sheet in the YZ plane is, for example, a partial ellipse formed of a part of an ellipse having one end of the minor axis of the ellipse as a vertex or a parabola including a parabola vertex. It is preferably a partial parabolic shape consisting of a part of
  • ⁇ max is 63 ° force, 80 °, and the aspect ratio is 0.42 force, 0.52. In this case, light is efficiently deflected to the front, and high brightness uniformity is obtained.
  • ⁇ max is 69 It is desirable that the angle is between 45 and 75, and the aspect ratio is 43, and so on.
  • ⁇ max 53 ° force is also 58 °
  • the aspect ratio is 0.34 force, such as 0.43.
  • ⁇ max is 55 ° force, etc. 57 °
  • the aspect ratio is 0.36 force, et al.
  • the convex portion of the light control sheet preferably has a convex portion width p of l ⁇ m to 500 ⁇ m. If it is larger than 50 O ⁇ m, the pattern itself is visually recognized from the exit surface, and the appearance quality deteriorates. If it is smaller than 1 ⁇ , it will be colored by the diffraction phenomenon and the appearance quality will be lowered. More preferably, it is 20 ⁇ m force, et al. 300 ⁇ m, and most desirably 30 ⁇ m force, et al. 200 ⁇ m. Within this range, it is difficult to observe the pattern itself, and it is easy to produce the protrusions, improving productivity.
  • the thickness of the light control sheet is not limited, but the thickness of the light control sheet may be set in consideration of the strength, productivity, and the like of the light control sheet itself.
  • the force thickness that varies depending on the size of the surface light source element is preferably 0.05 mm to lmm. If it is thinner than this, the strength of the light control sheet itself decreases, and the quality deteriorates due to deformation or the like. If it is thicker than this, the surface light source element becomes thick and the weight also increases. Further, in order to prevent the light control sheet from being deformed by heat and to obtain high productivity by extrusion molding or the like, it is desirable that the range is from 0.1 mm to 0.7 mm, and further from 0.2 mm. More desirable within 0.5mm range Good.
  • Examples of the method for producing the light control sheet include extrusion molding, injection molding, 2P molding, and the like. If a suitable molding method is selected in consideration of the size of the convex portion, the shape of the convex portion, mass productivity, etc. Good. Extrusion molding is suitable for large surface light source elements, such as when the major and minor sides exceed 400mm. If the thickness is less than lmm, extrusion molding and 2P molding are suitable.
  • FIG. 4 shows an example of the surface light source element 10 of the present invention in which two linear light sources 4a are arranged as primary light sources 4 on two opposite side surfaces of the light guide plate 1, and a large liquid crystal image. It is for displaying the display device.
  • Fig. 4 (a) and (b) are side views when observing the direction of force in the Y-axis direction from the side parallel to the X-Z plane, respectively, and the X-axis from the side parallel to the Y-Z plane. It is a side view when observing toward the direction.
  • Primary light sources 4 each having a pair of linear light sources 4a disposed in the reflector 4b are disposed on both side surfaces of the emission surface 6 and the bottom surface 7, respectively.
  • a thick light guide plate 1 is used to ensure a sufficient amount of light that enters the light guide plate 1 from the linear light source 4a.
  • both side surfaces on which the primary light sources 4 are arranged are made incident end surfaces 8, and both side surfaces intersecting with the incident end surfaces 8 are made reflected end surfaces 8b.
  • the diffusion sheet 5a and the light control sheet 11 according to the present invention are disposed above the emission surface 6.
  • the diffusion sheet 5a between the light guide plate 1 and the light control sheet 11, the emitted light from the surface light source element 10 can be made uniform and the quality can be improved. Further, the front luminance can be further increased by selecting an appropriate diffusion sheet 5a.
  • the output surface 6 has alternately the ridges 2 having a trapezoidal cross section and the trapezoidal ridges 3 whose tops and bottoms are reversed from each other. It is arranged. Since these ridges 2 and 3 are substantially the same as the trapezoidal surface la of the ridges 2 shown in FIGS. 1 and 2, the detailed description is omitted. Thereby, a plurality of ridges and ridges having a trapezoidal cross section perpendicular to the incident end face 8 are arranged on the exit surface 6.
  • protrusions 9 having a trapezoidal cross section are in contact with each other and arranged in parallel with the incident end surface 8.
  • the light quantity distribution of the emitted light can be adjusted.
  • the light from the linear light source 4a enters the light guide plate 1 from the incident end face 8 of the light guide plate 1 and propagates in the vertical direction while repeating total reflection between the output surface 6 and the bottom surface 7.
  • a part of this light is guided toward the exit surface 6 by the trapezoidal ridge 9 and the reflection sheet 5 formed on the bottom surface 7, and the cross section formed on the exit surface 6 is a trapezoidal prism.
  • the light is collected by (projection 2 and recess 3) and emitted within a desired viewing angle.
  • the luminance drop in the vertical direction is suppressed and the viewing angle is enlarged.
  • any optically transparent material can be used as a material for such a light guide plate or light control sheet.
  • any optically transparent material include methacrylic resin, polycarbonate resin, cycloolefin resin, polystyrene resin, methacryl styrene copolymer resin, and cycloolefin alkene copolymer resin.
  • These transparent resins generally have a refractive index greater than 1.4.
  • the refractive index satisfying the conditions of the present invention is preferably in the range of 1.42 to 1.65.
  • a light diffusion means may be provided on the light guide plate and / or the light control sheet provided in the surface light source element of the present invention.
  • the light diffusing means a method of providing random irregularities such as embossing on the main surface of the light guide plate or light control sheet, a method of providing fine particles for diffusing a small amount of light inside the structure, a diffusion sheet Examples thereof include a method of providing the light guide plate and the light control sheet on the incident surface side and / or the output surface side, or a combination of these methods.
  • Random irregularities can be realized by applying a solution in which fine particles are dispersed to the main surface by spraying, molding by extrusion of a resin in which fine particles are dispersed, and transferring from a mold having irregularities.
  • the degree of unevenness it is desirable that the arithmetic average roughness Ra is 3 m or less. If it is larger than this, the front luminance decreases because the diffusion effect becomes too large.
  • the trapezoidal pattern is an example in which the zenith surface (upper base) 2a and the inclined surface 2b are mirror surfaces. These surfaces are roughened. May be.
  • the arithmetic average roughness (Ra) based on JIS B0601 is in the range of 0.1 m to 10 ⁇ m, more preferably 0.15. It is in the range of ⁇ m to 5 ⁇ m, and particularly preferably in the range of 0 ⁇ 2111 to 2111.
  • such roughening may be performed only on the upper base (zenith surface) 2a of the ridge 2 but as shown in FIG. 12 (d), the inclined surface 2b And the zenith surface 2a (full diffused surface).
  • FIG. 12 (c) it may be provided only on the side surface (inclined surface 2b).
  • this roughening may be on the upper base (zenith surface) 3a of the recess 3.
  • the image display device of the present invention is realized by providing a transmissive display device on a surface light source element, and a transmissive liquid crystal panel or the like is raised as the display device. Thereby, it is possible to obtain an image display device having high luminance on the display surface and excellent luminance uniformity.
  • the transmissive display device is provided on the emission surface side of the surface light source element of the present invention
  • 1/100 to 1 / 1.5 of the pixel pitch of the transmissive display device is desirable. If it is larger than this, interference fringes with the pixel pitch occur, and the appearance quality deteriorates.
  • the master is peeled from the nickel conductive film, and a stamper on the exit surface side, which has a trapezoidal pattern with an inclination angle of 55 ° and a flat portion with a height of 0.01 mm and a width of about 10 m at the top. I was made.
  • a V-shaped groove with an apex angle of 100 ° and a height of 0.01 mm was prepared by cutting with a diamond tool in a direct die insert, and the nickel insert A layer was formed.
  • the master was peeled off, and a stamper II on the bottom side was formed by arranging prism patterns with a height of 0.01 mm and apex angle of 100 ° at predetermined intervals.
  • the obtained light guide plate 1 has an exit surface in which convex stripes having a trapezoidal cross-sectional shape are spaced apart and a bottom surface in which convex stripes having a trapezoidal cross-sectional shape are connected to each other. It has.
  • the trapezoidal convex shape of this exit surface has a height H of 10 Hm, a zenith width W2 of 10 ⁇ m, a bottom surface width Wl force 4 111, and the trapezoidal convex shape of the bottom surface has a height of 10 m,
  • the base angles al and a2 were 40 °, and the lower bottom was gradually adjusted from 180 in to 60 in from the cold cathode tube side to the center.
  • the light control sheet of the present invention is formed by continuously forming parallel groove-shaped concave portions having a shape obtained by inverting the ridge-shaped convex portions (pitch p8011 m) of the light control sheet on a roll-shaped mold by cutting. Then, using the obtained roll-shaped mold, a methyl methacrylate-styrene copolymer resin (refractive index: 1.54) in which about 10% by weight of a styrene-butadiene rubber-like copolymer is dispersed is extruded. It was produced by.
  • the incident end faces at both ends of the light guide plate 1 are arranged parallel to the X axis, and a CCFL light source with a tube surface brightness of 39, OOOcd / m 2 (constant) along the incident end face is shown in Fig. 5.
  • a pair was arranged on each side, and reflectors were arranged on the back of the light source.
  • the light control sheet was disposed on the light exit surface of the light guide plate 1 so that the flange-shaped convex portion 15 of the light control sheet 11 was parallel to the X axis.
  • a reflection sheet 5 (E6SL manufactured by Toray Industries, Inc.) was provided on the bottom surface 7 and the reflection end surface 8b to form the backlight device shown in FIG.
  • the luminance performance of the backlight device thus formed was measured.
  • This luminance measurement was carried out using a luminance meter (TOPCON BM-7) manufactured by Topcon Corporation at a distance of 50 cm from the sample surface.
  • TOPCON BM-7 luminance meter
  • the ratio of the minimum luminance to the maximum luminance on the backlight surface was determined as luminance unevenness.
  • both sides from the vertical direction of the light exit surface with respect to the vertical plane perpendicular to the long side of the ridge having a trapezoidal cross-sectional shape formed on the light exit surface.
  • the angle distribution of luminance (hereinafter referred to as horizontal angle luminance distribution) was measured by tilting the luminance meter sequentially. Similarly, at the center of the exit surface of the light guide plate 1, the cross-sectional shape formed on the exit surface is parallel to the long side of the trapezoidal ridge, and the exit surface is perpendicular to the light guide plate 1.
  • the luminance angle distribution (hereinafter referred to as the vertical angle luminance distribution) was measured by tilting the luminance meter sequentially from the vertical direction to the both sides. From the horizontal angular luminance distribution and the vertical angular luminance distribution, the horizontal half-value angle and the vertical half-value angle, which are indicators of viewing angle characteristics, were obtained.
  • the maximum luminance was 4,785 cd / m 2
  • the luminance unevenness was 0.81
  • the horizontal half-value angle was 52.7 °
  • the vertical half-value angle was 38.7 °.
  • Example 2 is a case where one diffusion sheet and one light control sheet are placed on the exit surface of the light guide plate used in Example 1.
  • the incident end faces at both ends of the same light guide plate 1 as in Example 1 are arranged parallel to the X axis, and a CCFL light source with tube luminance of 39, OOOcd / m 2 (—constant) is shown along this incident end face.
  • a CCFL light source with tube luminance of 39, OOOcd / m 2 (—constant) is shown along this incident end face.
  • each pair was placed on the left and right, and reflectors were placed behind the light source.
  • a sheet of diffusion sheet (product name: D124) 5a made by Gidden Co., Ltd. is arranged on the light-exiting surface of the light guide plate 1, and the hook-shaped convex part is parallel to the X axis.
  • a light control sheet 11 (the same light control sheet as used in Example 1) was disposed.
  • a reflection sheet 5 (E6SL manufactured by Toray Industries, Inc.) was provided on the bottom surface 7 and the reflection end surface 8b to form the backlight device shown in FIG.
  • the luminance performance of the backlight device thus formed was measured by the same method as in Example 1. As a result, the maximum luminance was 5,070 cd / m 2 , the luminance unevenness was 0.81, and the horizontal half-value angle was 51. 8 °, the vertical half-value angle was 37.4 °, high brightness and good viewing angle characteristics.
  • a light guide plate is produced by applying printed dots on the bottom of a PMMA flat plate (plate thickness 6 mm), and one diffusion sheet and a light control sheet 1 are formed on the flat portion on the light exit surface side of the light guide plate. This is the case when a sheet is loaded.
  • a printed dot is applied to the bottom surface of the PMMA flat plate (thickness 6 mm) used in Comparative Example 1, and the light control sheet (used in Example 1 is used) on the flat part on the light exit surface side of the light guide plate. This is the case where one sheet is mounted.
  • a light source is disposed along the light incident end face at both ends of the light guide plate provided with the print dots, a reflector 4b is disposed behind the light source, and on a flat portion on the light exit surface side of the light guide plate,
  • One light control sheet is installed so that the groove row is substantially parallel to the light incident end face, and the reflection sheet 5 (E6SU manufactured by Toray Industries, Inc. is provided on the bottom face and the reflection end face.
  • the maximum luminance was 3,903 cd / m 2 and the luminance unevenness was 0.78
  • the horizontal half-value angle was 69.2 °
  • the vertical half-value angle was 42. It was 5 °.
  • This comparative example is a case of deviating from the conditions satisfied by the light control sheet of the present invention.
  • the light control sheet of this comparative example was cut into a roll mold by cutting.
  • C) Groove-shaped recesses with 20 m bowl-shaped protrusions inverted are continuously formed in parallel, and about 10 wt% of styrene-butadiene rubber-like copolymer is dispersed using the above-mentioned mold tool. It was produced by extrusion molding of a methyl methacrylate-styrene copolymer resin (refractive index 1.54).
  • the light control sheet 11 according to this comparative example has a thickness of 0.4 mm
  • the cross-sectional shape of the Y-Z plane of this convex part becomes semicircular
  • One sheet of diffusion sheet (product name: DX2) manufactured by Gidden Co., Ltd. is arranged on the flat part of the light guide plate used in Example 1, and the ridge-shaped convex part of the light control sheet is further on the X axis. Arranged to be parallel.
  • a reflection sheet 5 (E6SL manufactured by Toray Industries, Inc.) was provided on the bottom surface and the reflection end surface to form the backlight device shown in FIG.
  • the maximum luminance was 4,816 cd / m 2
  • the luminance unevenness was 0.81
  • the horizontal half-value angle was 51.2 °
  • the vertical half-value angle was 37. It was 2 °.
  • Example 2 Compared with Example 2, the shape of the convex portion of the light control sheet increased the return component to the light guide plate, and the increase in the high emission angle component decreased the brightness in the front direction.
  • the inclination from the vertex of the contour line of the light control member deviates from the monotonous increase. That is, it is a case where it deviates from 0.25P ⁇ I Ymax
  • the light control sheet of this comparative example was prepared by continuously forming in parallel a groove-like recess having a shape obtained by reversing the ridge-like protrusion of a 20 m pitch of the light control sheet on the roll-shaped mold by cutting.
  • a methacrylic acid methylstyrene-styrene copolymer resin (refractive index 1.54) in which about 10 wt% of styrene-butadiene rubber-like copolymer is dispersed is extruded using a metal mold. Therefore, it produced.
  • the light control sheet 11 according to this comparative example has a thickness of 0.4 mm, and the cross-sectional shape of the YZ plane of the convex portion is a Gaussian distribution,
  • ⁇ ′ 42.3 °
  • the absolute value of Ymax is 1/4 or less of the pitch 20 m, which deviates from the conditions satisfied by the light control sheet of the present invention.
  • One sheet of diffusion sheet (product name: DX2) manufactured by Gidden Co., Ltd. is disposed on the flat portion of the light guide plate used in Example 1, and the ridge-shaped convex portion of the light control sheet is further on the X axis. Arranged to be parallel.
  • a reflection sheet 5 (E6SL manufactured by Toray Industries, Inc.) was provided on the bottom surface and the reflection end surface to form the backlight device shown in FIG.
  • the maximum luminance was 4,533 cd / m 2
  • the luminance unevenness was 0.80
  • the horizontal half-value angle was 49.0 °
  • the vertical half-value angle was 37. It was 3 °.
  • the viewing angle in the vertical direction can be reduced and the viewing angle in the horizontal direction can be expanded, so that the luminance can be increased and the viewing angle characteristics can be improved. It can be suitably used for a surface light source element.
  • the surface light source element of the present invention is of an edge light type, it is not limited to a monitor device equipped with a liquid crystal backlight device, but to various thin image display devices such as a notebook computer, a lighting announcement, and a traffic sign. Is expected to be applied.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

L'invention concerne un élément de source de lumière planaire (10) de système d'éclairage par la tranche, muni d'une source de lumière primaire (4) disposée sur une surface d'extrémité (8) d'arrivée de la lumière d'une plaque guide de lumière (1), d'un moyen de réflexion(5) disposé sur une surface de fond (7), et d'un élément de commande de lumière (11) conçu pour commander la direction de la lumière émise en sortie de la plaque guide de lumière (1). Sur la surface (6) d'émission en sortie de la lumière et sur la surface (7) de fond de la plaque guide de lumière (1), des motifs saillants se coupant de manière orthogonale les uns les autres sont formés, et sur le côté d'émission en sortie de la lumière de l'élément de commande de lumière (11), des parties (15) saillantes en forme de stries sont formées parallèlement à un axe X. En ce qui concerne la forme de la partie saillante (15), une ligne de profil (15a) d'une section transversale parallèle à une surface Y-Z plane comprend au moins une partie en ligne courbe comprenant le sommet, et une inclinaison ϑ, sur laquelle une tangente à la ligne de profil (15a) coupe l'axe Y, satisfait les inégalités suivantes dans une plage où l'inclinaison s'accroît de manière monotone dans les deux directions, avec le sommet de la partie saillante (15) au centre ; 0,45 ϑmax ≤ ϑ' ≤ 0,75 ϑmax, 0,25p ≤ |Ymax|.
PCT/JP2007/067820 2006-09-15 2007-09-13 Élément de source de lumière planaire, élément de commande de lumière utilisé pour l'élément de source de lumière planaire et dispositif d'affichage d'images utilisant l'élément de source de lumière planaire WO2008032775A1 (fr)

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JP2011216394A (ja) * 2010-04-01 2011-10-27 Toppan Printing Co Ltd 隠蔽レンズシートを用いた照明ユニット、及び、表示装置
JP2011222437A (ja) * 2010-04-14 2011-11-04 Toppan Printing Co Ltd 照明ユニット及びそれを備えた表示装置
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JP2002311509A (ja) * 2001-04-16 2002-10-23 Dainippon Printing Co Ltd レンチキュラーレンズシートおよびこれを用いたスクリーン
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JP2011171105A (ja) * 2010-02-18 2011-09-01 Dainippon Printing Co Ltd 面光源装置および表示装置
JP2011216394A (ja) * 2010-04-01 2011-10-27 Toppan Printing Co Ltd 隠蔽レンズシートを用いた照明ユニット、及び、表示装置
JP2011222437A (ja) * 2010-04-14 2011-11-04 Toppan Printing Co Ltd 照明ユニット及びそれを備えた表示装置
JP2012003883A (ja) * 2010-06-15 2012-01-05 Dainippon Printing Co Ltd 導光板、面光源装置および表示装置
JP2012084505A (ja) * 2010-09-14 2012-04-26 Dainippon Printing Co Ltd 面光源装置、液晶表示装置および光学部材
US8797480B2 (en) 2011-10-18 2014-08-05 Dai Nippon Printing Co., Ltd. Light guide plate, surface light source device, and display device
US9217821B2 (en) 2011-10-18 2015-12-22 Dai Nippon Printing Co., Ltd. Light guide plate, surface light source device, and display device
EP3327341A1 (fr) * 2016-11-28 2018-05-30 Samsung Electronics Co., Ltd. Unité de rétroéclairage et afficheur la comprenant
CN108121032A (zh) * 2016-11-28 2018-06-05 三星电子株式会社 背光单元以及包括背光单元的显示装置
JP2018088408A (ja) * 2016-11-28 2018-06-07 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． バックライトユニット及びこれを含むディスプレイ装置
KR20180060183A (ko) * 2016-11-28 2018-06-07 삼성전자주식회사 백라이트 유닛 및 이를 포함하는 디스플레이 장치
US10338298B2 (en) 2016-11-28 2019-07-02 Samsung Electronics Co., Ltd. Backlight unit and display device comprising the same
KR102399552B1 (ko) * 2016-11-28 2022-05-18 삼성전자주식회사 백라이트 유닛 및 이를 포함하는 디스플레이 장치
JP7229661B2 (ja) 2016-11-28 2023-02-28 三星電子株式会社 バックライトユニット及びこれを含むディスプレイ装置

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