WO2008029911A1 - Élément à source lumineuse planaire, élément de commande de lumière et dispositif d'affichage d'image utilisant celui-ci - Google Patents

Élément à source lumineuse planaire, élément de commande de lumière et dispositif d'affichage d'image utilisant celui-ci Download PDF

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Publication number
WO2008029911A1
WO2008029911A1 PCT/JP2007/067490 JP2007067490W WO2008029911A1 WO 2008029911 A1 WO2008029911 A1 WO 2008029911A1 JP 2007067490 W JP2007067490 W JP 2007067490W WO 2008029911 A1 WO2008029911 A1 WO 2008029911A1
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Prior art keywords
light
light source
axis direction
light control
axis
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Application number
PCT/JP2007/067490
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English (en)
Japanese (ja)
Inventor
Yoshimi Ohta
Ikuo Onishi
Original Assignee
Kuraray Co., Ltd.
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Application filed by Kuraray Co., Ltd. filed Critical Kuraray Co., Ltd.
Priority to JP2008533210A priority Critical patent/JPWO2008029911A1/ja
Publication of WO2008029911A1 publication Critical patent/WO2008029911A1/fr

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Classifications

    • 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
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133606—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
    • 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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • 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
    • G02F1/133621—Illuminating devices providing coloured light

Definitions

  • the present invention relates to a surface light source element having a plurality of point light sources, a sheet-like light control member provided in the surface light source element, and an image display device using the same.
  • the present invention relates to a direct-type surface light source element used in lighting signage devices, liquid crystal display devices, and the like that are required to have high performance, a light control member included in the surface light source element, and an image display device using the light control member.
  • surface light source elements used in image display devices include an edge light method and a direct method.
  • the edge light method is a method in which light from a light source arranged on the end face of the light guide plate is taken out from the main surface perpendicular to the end face by the light guide plate in the front direction. This is a system in which light is incident on the diffuser plate, light is made uniform by the diffuser plate, and light is extracted to the exit surface opposite to the incident surface.
  • Luminance uniformity is particularly important for eliminating the light / dark difference in the screen due to the light source image, and is important for applications such as image display devices and illuminated signboards.
  • a direct-type surface light source element includes a light source, a reflection plate, a diffusion plate, a diffusion sheet, and the like!
  • Anti The projecting plate reflects the light emitted from the light source to the back side in the front direction, and the diffusion plate has a function of reducing the image of the light source in which fine particles that diffuse the light are dispersed.
  • Fluorescent lamps which are linear light sources, have been used as the light source, but there are problems such as poor color reproducibility and the burden on the environment due to the use of mercury. . Therefore, it has been proposed that a point light source such as a light emitting diode (LED) or the like is arranged in a plane and used as a planar light source (for example, a non-light source) that has good color reproducibility and does not use mercury. (See Patent Document 1).
  • LED light emitting diode
  • Patent Document 1 Japanese Patent Laid-Open No. 2005-340750
  • Patent Document 2 Japanese Patent Laid-Open No. 2005-327682
  • Patent Document 3 Japanese Patent Laid-Open No. 2005-38643
  • Non-Patent Document 1 flat-panel display2004 Business Edition pl 70 Nikkei BP Publishing Invention Disclosure
  • a direct-type surface light source element used in an image display device or the like which enables high color reproducibility using a point light source such as an LED, and has high light use efficiency. Therefore, there is no change in the optical design of the light control component, brightness reduction, brightness uniformity, and color uniformity deterioration due to the increase in size, which is high brightness and high brightness uniformity and color uniformity. Therefore, it is easy to respond to the increase in size, and it is possible to obtain high brightness and color uniformity in the front direction without strict alignment between the light source and other members.
  • An object of the present invention is to provide a sheet-like light control member and an image display device using the same.
  • the present invention provides the following means for solving the above problems.
  • At least an exit surface parallel to the XY plane with one of the normals of the XY plane parallel to the X axis and the Y axis orthogonal to the X axis as the front direction.
  • the plurality of point light sources are periodically arranged in the X-axis and Y-axis directions in a virtual plane parallel to the XY plane, and include a light emitting surface parallel to the XY plane,
  • the light control member is arranged in parallel to the XY plane and in the front direction of the plurality of point light sources, and the emission surface is arranged on the front direction side of the light control member.
  • a first light control unit comprising a plurality of hook-shaped convex portions 1 orthogonal to the X-axis direction and parallel to the Y-axis direction is provided on the exit surface side of one light control member,
  • a second light control unit comprising a plurality of hook-shaped convex portions 2 parallel to the X-axis direction and perpendicular to the Y-axis direction is provided on the other exit surface side.
  • the center position of the point light sources arbitrarily selected, where D is the length of one cycle along the X axis and D is the length of one cycle along the Y axis.
  • the origin X-axis direction
  • the light emitting surface of the selected point light source and the first light in a plane parallel to the X-axis direction and perpendicular to the Y-axis direction, where X is the position coordinate and Y is the position coordinate in the Y-axis direction.
  • the distance from the control unit is H, and the function of the light incident on the first light control unit from the selected point light source in the direction of the front surface of the exit surface at X is f (X),
  • 1 1 mm 1 max 1 mm 1 ma3 ⁇ 4 is 0.8 or more
  • the minimum value X of X is — 3. OD ⁇ X 0.5.
  • the maximum value of X is in the range of 0.5D ⁇ X ⁇ 3.0D
  • n Refractive index of hook-shaped convex part 1 of the first light control part
  • n Refractive index of the base material of the first light control unit
  • ⁇ thickness from the incident surface of the first light control unit to the bottom of the bowl-shaped convex part 1
  • the distance between the light emitting surface of the selected point light source and the second light control unit is H
  • a function that expresses the intensity of light incident on the second light control unit from the selected point light source in the direction of the front surface of the exit surface in the position coordinate Y in the Y-axis direction is represented by f (Y),
  • 2 ma is 0.8 or more
  • the minimum value of Y is Y 3. OD ⁇ Y ⁇ -0.
  • the maximum direct value of Y is in the range 0.5D ⁇ Y ⁇ 3.0D
  • n Refractive index of the ridge-shaped convex part 2 of the second light control part
  • n Refractive index of the base material of the second light control unit
  • T Thickness from the incident surface of the second light control unit to the bottom of the bowl-shaped convex part 2
  • the second invention is the surface light source element of the first invention
  • the area representing the cross-sectional shape in the X-axis direction of the ridge-shaped convex part 1 is arranged in the order of the ⁇ to ⁇ force ⁇ axis position coordinates
  • the surface light source elements are arranged in order.
  • a third invention is the surface light source element of the first or second invention
  • the surface light source element is characterized in that the shape of one region is approximated by a curve.
  • a fourth invention is the surface light source element according to any one of the first ;! to 3, wherein in the first light control unit,
  • the proportion of light emitted within 0 degrees is 50% or more of the total emitted light
  • the ratio of the light emitted within an angle of 30 degrees with respect to the front direction is 50% or more of the total emitted light. It is a surface light source element.
  • the fifth invention is a sheet-like light control member having light control means for controlling a light beam direction along the X axis or the Y axis, which is included in the surface light source element of the present invention.
  • a sixth invention is an image display device characterized in that a transmissive display device is arranged in the front direction of the surface light source element of the present invention.
  • high luminance uniformity and high color uniformity are obtained by replacing the diffusion plate in which fine particles for diffusing light are dispersed with two sheet-like light control members.
  • the present invention by providing a hook-shaped convex portion having a suitable shape on the exit surface of the light control member, the use of fine particles that diffuse light is avoided or greatly reduced, and the light use efficiency is improved. Therefore, high brightness can be achieved.
  • all points on the incident surface of the light control member have a uniform property that controls the direction in which the incident light is emitted in the same way, so that the alignment with the light source is not only advantageous for size change. Is also unnecessary.
  • the intensity distribution of the emitted light in the front direction can be obtained.
  • the combined functions of the light control member such as brightness uniformity and brightness enhancement, make it possible to eliminate or reduce the use of other functional optical films, which is advantageous for productivity and thinning.
  • a transmissive display device on the exit surface side of these surface light source elements, image display with high color reproducibility, high brightness, brightness uniformity, and color uniformity is achieved. A device is obtained.
  • a surface light source element provided by the present invention is a surface light source element having an emission surface parallel to an XY plane parallel to an X axis and a Y axis perpendicular to the X axis.
  • the element includes a plurality of point light sources having a light emitting surface parallel to the XY plane, and two sheet-like light control members. It is possible to obtain brightness uniformity and color uniformity. If the distribution of the position of the intensity of the emitted light in a certain direction is constant on the emission surface of the surface light source element, high luminance uniformity in that direction is achieved. In addition, when many types of point light sources that emit specific colors are used, high uniformity and color uniformity can be achieved by making the above distribution constant for each color.
  • the light control member provided in the surface light source element of the present invention obtains luminance uniformity in the front direction by making the intensity of the emitted light in the front direction substantially constant.
  • high color uniformity is obtained by obtaining luminance uniformity in the front direction.
  • a first invention of the present invention comprises a plurality of point light sources, an exit surface parallel to the XY plane, and two light control members, wherein the plurality of point light sources are X—
  • the surface light source element is periodically arranged in the X-axis and Y-axis directions in a virtual plane parallel to the Y plane, and the light control member is arranged in parallel to the XY plane.
  • one of the surfaces from which light is mainly emitted is the first light composed of a plurality of hook-shaped convex portions 1 that are orthogonal to the X-axis direction and parallel to the Y-axis direction.
  • the other one of the two light control members that emits light mainly has a surface that is parallel to the X-axis direction and orthogonal to the Y-axis direction.
  • the second light control unit is configured to control the light from the point light source by the first light control unit and the second light control unit, and the distribution of the emitted light in the front direction is made uniform. It becomes possible to do.
  • the first light control unit is composed of a plurality of ridge-shaped convex portions 1 that are orthogonal to the X-axis direction and parallel to the Y-axis direction, and controls light rays along the X-axis direction to transmit light from the point light source X Uniform along the axial direction.
  • the second light control unit is composed of a plurality of ridge-shaped convex portions 2 that are parallel to the X-axis direction and orthogonal to the Y-axis direction, control the light beam along the Y-axis direction, and direct the light from the point light source to Y Uniform along the axial direction.
  • the first light control unit Further, by combining the second light control unit, it is possible to obtain two-dimensional luminance uniformity and color uniformity. Also, by providing two light control members, it is possible to provide the first light control unit and the second light control unit in different light control members, which facilitates the manufacturing process and increases the brightness. This is advantageous in improving color uniformity and achieving improved brightness.
  • the light control member used for the surface light source element of the present invention is suitable for the cross-sectional shape of the hook-shaped convex part 1 and the hook-shaped convex part 2 to achieve uniformity of luminance in the front direction and uniformity of color. It is possible to increase.
  • the optical properties of the light control member become uniform, so that no precise alignment is required, and a surface light source element or a point light source
  • the surface light source elements can be manufactured with high productivity.
  • the light control member has a length of one period along the X axis of the plurality of point light sources as D, a center position of the arbitrarily selected point light source as an origin, and a position coordinate in the X axis direction.
  • the position coordinates in the X and Y axis directions are set to Y, and the distance between the light emitting surface of the selected point light source and the first light control unit is represented as H and the light output intensity in the front direction of the exit surface at X.
  • the light control member has a length D of one period along the Y axis of the plurality of point light sources as D, the light emitting surface of the selected point light source, and the second light control.
  • D the length of one period along the Y axis of the plurality of point light sources as D, the light emitting surface of the selected point light source, and the second light control.
  • the function that expresses the light intensity in the front direction of the exit surface in 2 2 is defined as f (X).
  • one period along the X axis or the Y axis refers to a unit of arrangement of light sources arranged repeatedly in the X axis direction or the Y axis direction.
  • the array of point light sources is reproduced by repeating this unit, including all elements related to the uniformity of color and brightness, such as the intensity, relative position, and color of each light source along the direction or Y-axis direction.
  • the arrangement in the X-axis direction and the arrangement in the Y-axis direction are independent.
  • the period is as shown in FIG.
  • the point light source selected as the center, and by realizing high brightness and color uniformity in the range of one cycle of the array of point light sources
  • high luminance and color uniformity can be obtained over the entire emission surface of the surface light source element.
  • the light control member since the light control member uniformly controls the direction of the emitted light at an arbitrary point on the incident surface, the light control member can be controlled within a period of one cycle! /, High! /, By obtaining brightness and color uniformity, the power S can be obtained to obtain high brightness and color uniformity over the entire emission surface of the surface light source element.
  • Luminance uniformity in the surface direction and color uniformity can be obtained.
  • Ratio of g (X), which is the minimum value of g (X), to g (X), which is the maximum value, g (X) / g (X) is greater than or equal to 0 ⁇ 8 and g (Y) mm 1 max 1 mm 1 max 2
  • Ratio of minimum value g (Y) to maximum value g (Y) g (Y) / g (Y) is more than 0 ⁇ 8
  • the intensity of the emitted light in the front direction at an arbitrary position on the exit surface of the surface light source element becomes substantially constant, and it is possible to obtain luminance and color uniformity.
  • FIG. 10 is a diagram showing f (X) and g (X) of the surface light source element of the present invention in which a point light source is arranged in the X-axis direction as 30 mm, which is shown for (X) in FIG. is there.
  • Arbitrarily selected point light source The center position of the light source is the origin, and the distance [mm] in the X-axis direction is the X coordinate.
  • Figure 10 and Figure 8 shows a similar distribution for f (Y) and g (Y), where Y is the position coordinate.
  • f (Y) need not have the same distribution as f (Y).
  • the present inventors have found out the cross-sectional shapes of the hook-like convex part 1 and the hook-like convex part 2 for making the intensity distribution of the emitted light in the front direction substantially uniform. That is, in the present invention, the minimum value X of X is in the range of-3. OD ⁇ X ⁇ -0. 5D, and the maximum value X force S, 0.5D min 1 min 1 max 1
  • hook-shaped convex part 1 A region having different inclinations N to N forces. Of these, hook-shaped convex part 1
  • the area 0 is inclined at 0, that is, parallel to the inclination of the light incident surface of the light control member, and the light incident from directly below can be efficiently emitted in the front direction.
  • n Refractive index of hook-shaped convex part 1 of the first light control part
  • n Refractive index of the base material of the first light control unit
  • ⁇ thickness from the incident surface of the first light control unit to the bottom of the bowl-shaped convex part 1 I (a): Arbitrarily selected point light source force Unit angle in the direction of ⁇ along the X-axis direction
  • n Refractive index of the ridge-shaped convex part 2 of the second light control part
  • n Refractive index of the base material of the second light control unit
  • T Thickness from the incident surface of the second light control unit to the bottom of the bowl-shaped convex part 2
  • the angle formed clockwise is positive and the angle formed counterclockwise is negative with respect to the reference line.
  • equation (8) will be described with reference to FIG.
  • the light is refracted, and the first light control is performed at an angle ⁇ expressed by Equation (7) with respect to the normal direction.
  • the length of the slope of region i occupied by the slope of angle ⁇ is b, and the first li li from the slope of region i
  • e be the length of projection in the direction perpendicular to the ray direction in the ridge-shaped convex part 1 of the light control unit
  • the proportion of the light 8 directed to the region i out of the light 8 directed to is e / (P ⁇ cos / 3).
  • the intensity of light per unit area incident on the first light control unit at an angle ⁇ ie, illumination.
  • the degree is proportional to I (a) -cos 2 a as described later.
  • the light incident on the coordinate is coordinated when the thickness of the substrate of the first light control unit
  • the intensity of the emitted light in the front direction is proportional to the emission intensity of the point light source and the emission ratio in the front direction.
  • the sum of a can be set such that the width of the ridge-shaped convex portion 1 is P,
  • V U / cos ⁇ (26)
  • V is proportional to cos 2 ⁇ . If the intensity of the emitted light from the linear light source within ⁇ ⁇ is ⁇ ( ⁇ ), the intensity of the incident light per unit area to the light control unit 1, that is, the illuminance is ⁇ ( ⁇ ) -cos 2 ⁇ Proportional.
  • Fig. 7 shows the principle of directing light to the front by the first light controller used in the surface light source element of the present invention.
  • the incident light 7 entering the first light control unit 2 having a refractive index n from the point light source with ⁇ is the light control unit 2
  • the light 8 is refracted by the incident surface 6 and passes through the inside of the light control unit 2, and the light 8 is refracted by the hook-shaped convex portion 1 on the emission surface side and is emitted to the emission surface side. At this time, the emitted light 9 is emitted in the front direction when the inclination is a desirable angle ⁇ in the bowl-shaped convex portion 1.
  • the present invention is based on the arrangement.
  • the front direction can be adjusted by adjusting the ratio of angle ⁇ .
  • the inclination ⁇ of the exit surface for deflecting the incident light 7 in the front direction is equal to the refractive index of the bowl-shaped convex portion 1.
  • the angle at which light is incident on the incident surface 6 with respect to the normal of the incident surface 6 is ⁇ , and the light is refracted at the incident surface 6 and passes through the inside of the bowl-shaped convex portion 1.
  • the angle formed by the incident light with respect to the normal of the incident surface 6 is / 3, and the light traveling inside the ridge-shaped convex portion 1
  • the angle formed with respect to the normal of the exit slope of the hook-shaped convex part is ⁇ , and the light is refracted at the exit slope
  • the directional force on the exit surface and the angle formed with respect to the normal to the slope of the light is ⁇ , and Let the ratio be. At this time, let ⁇ be the angle of the slope of the ridge-shaped convex portion so that the light emitted from the ridge-shaped convex portion travels in the front direction.
  • a, n, and ⁇ have such a relationship that the refractive index n of the bowl-shaped convex part 1 and the slope of the bowl-shaped convex part 1
  • the emitted light can be emitted from the region i of the bowl-shaped convex portion 1 in the front direction.
  • the intensity of light emitted per unit angle in the direction of ⁇ along the Y-axis direction from an arbitrarily selected point light source is affected by the first light control unit. This effect is explained below.
  • I (a) is obtained from the arbitrarily selected point light source by ⁇ along the Y-axis direction.
  • 2 2j A decays at a large angle with respect to the intensity of light emitted per unit angle in the 2j direction.
  • This attenuation can be approximated by an appropriate function, for example (cos a) m and I (
  • a second invention of the present invention is the surface light source element of the first invention, wherein a region N to N force axis position coordinates representing a cross-sectional shape of the hook-shaped convex portion 1 in the X-axis direction are provided.
  • the regions N to N that are arranged in order and that represent the cross-sectional shape in the Y-axis direction of the bowl-shaped convex part 2 are the Y-axis.
  • inflection points are present in the cross-sectional shape in the X-axis direction of the unit bowl-shaped protrusion 1 and the cross-sectional shape in the Y-axis direction of the unit bowl-shaped protrusion 2.
  • the entire convex part is substantially convex.
  • the light reaches the region on another convex part before it reaches the region on the desired convex part, and the direction of the light beam is changed by reflection or refraction, and the light emission direction is controlled. May be difficult.
  • a shape that does not have an inflection point has a simpler shape than a shape that has an inflection point.
  • a third invention of the present invention is the surface light source element of the first or second invention, wherein the cross-sectional shape in the X-axis direction of the bowl-shaped convex portion 1 forms the convex portion (2N + 1)
  • a shape obtained by approximating the shape of at least one pair of two adjacent regions out of a plurality of regions with different inclinations by a curve, and the cross-sectional shape in the Y-axis direction of the bowl-shaped convex portion 2 is the convex shape (2N + 1) slopes forming part
  • the surface light source element is characterized in that the shape of at least one pair of two adjacent regions among the different regions is approximated by a curve.
  • the hook-shaped convex portion 1 is a force composed of (2N + 1) slopes of angle ⁇ .
  • the hook-like convex part 2 of the first invention is composed of (2N + 1) slopes of angle ⁇ .
  • Figure 2 shows a shape that approximates the shape of at least one of the two adjacent regions with a curve.
  • the intensity distribution of outgoing light and the angular distribution of outgoing light in the front direction become smoother, which is desirable.
  • it is easier to shape it is advantageous in production and desirable.
  • the joint portion in the region is not sharp and has a shape, it is difficult to cause damage, so it is preferable that the light emission direction change due to the breakage of the joint portion in the region and unnecessary scattering hardly occur.
  • a fourth invention of the present invention is the surface light source element of any of the first to third inventions, wherein the first light control unit is parallel to the X-axis direction and orthogonal to the Y-axis direction.
  • the ratio of the light emitted within an angle of 30 degrees with respect to the front direction is 50% or more of the total emitted light
  • the second light control unit is orthogonal to the X-axis direction and Y
  • the surface light source element is characterized in that the proportion of light emitted within an angle of 30 degrees with respect to the front direction is 50% or more of the total emitted light.
  • the surface light source element emits a relatively large proportion of light emitted in the front direction, bright illumination can be efficiently obtained in applications such as a television or a personal computer monitor that mainly observe the light exit surface in the front direction.
  • the first light control unit in a cross section parallel to the X-axis direction and perpendicular to the Y-axis direction.
  • the ratio of the light emitted within a range of an angle of 30 degrees or less with respect to the front direction can be adjusted by adjusting the angle of the inclined surface of the hook-shaped convex part 1 of the first light control part
  • the ratio of light emitted within a range of an angle of 30 degrees or less with respect to the front direction in the cross section orthogonal to the X-axis direction and parallel to the Y-axis direction is It can be adjusted by adjusting the angle of the slope of the hook-like convex part 2 of the second light control part.
  • the angle of the slope of the bowl-shaped convex part 1 can be adjusted by adjusting the width of X to X, and the front max mm
  • the angle of the slope of the recording-like convex portion 2 can be adjusted by adjusting the width of Y to ⁇ .
  • a fifth invention of the present invention is a sheet-like shape having a light control means for controlling the direction of the light beam along the X-axis or Y-axis, which is included in the surface light source element of any of the first to fourth inventions.
  • This is a light control member.
  • the light control member includes a first light control unit and a second light control unit that control a light beam direction, and light incident mainly from a light incident surface of the light control member is a first light control unit. Part of the light is reflected by the means or the second light control means, and part of the light is transmitted. This function improves the brightness uniformity and color uniformity of the emitted light.
  • the light passing through the light incident surface of the light control member mainly refracts at the incident surface, passes through the light control member, and reaches the hook-shaped protrusion 1 and / or the hook-shaped protrusion 2.
  • the light incident on the hook-shaped convex part 1 is refracted along the X-axis direction according to the slope of the slope of each region in the hook-shaped convex part 1, and the light reaching the hook-shaped convex part 2 Refracts along the Y-axis according to the slope of the slope in each region in 2.
  • the light that reaches the region of an appropriate angle is emitted in the front direction.
  • the luminance distribution of the emitted light in the front direction at a point on an arbitrary emission surface is made constant. It is possible to do.
  • a sixth invention of the present invention is an image display device configured by disposing a transmissive display device in the front direction of the surface light source element of any one of the inventions !!
  • the surface light source element is a uniform surface light source element having a uniform intensity distribution of emitted light in the front direction, and the ratio of the intensity of emitted light in the front direction can be increased.
  • the image display device of the present invention is a display module in which a surface light source element and a display element are combined, and further, this display module is used. It is a device having at least an image display function, and includes a television, a personal computer monitor, and the like.
  • the intensity distribution of outgoing light in the front direction can be evaluated by measuring the distribution of front luminance.
  • the distribution of front luminance is the same as the luminance meter is moved at regular intervals in the X-axis direction and Y-axis direction while keeping the distance between the luminance meter and the measurement point on the exit surface of the surface light source element constant. 3 ⁇ 4 Measure.
  • the ratio of the outgoing light in the front direction is first measured along the cross section parallel to the X axis direction and perpendicular to the Y axis direction, and along the cross section perpendicular to the X axis direction and parallel to the Y axis direction. Measure the point by changing the angle while keeping the distance between the luminance meter and the measurement point constant.
  • the brightness value obtained for each angle is converted into energy, and the ratio of light emitted within an angle of 30 degrees with respect to the front direction in the cross section parallel to the X axis direction and perpendicular to the Y axis direction, and the X axis direction Calculate the proportion of light emitted within an angle of 30 degrees with respect to the normal direction in a cross section orthogonal to the Y-axis direction.
  • the intensity distribution of the emitted light in the front direction where the light use efficiency is high is made constant, thereby eliminating the light / dark difference due to the image of the point light source.
  • a surface light source element with improved brightness uniformity and color uniformity in the front direction is also provided.
  • by approximating the ridge-like convex part 1 and the ridge-like convex part 2 of the light control member with curves it is possible to obtain a smooth intensity distribution of outgoing light in the front direction and a desired smooth outgoing light angle distribution. .
  • the use of other functional optical films can be eliminated or reduced, which is advantageous for productivity and thinning.
  • the light control member provided in the surface light source element of the present invention performs the same optical control on the incident light at all locations, the strict alignment between the point light source and the light control member is achieved. It is unnecessary and can respond immediately to changes in the display size and the number and arrangement of point light sources, making it possible to manufacture surface light source elements with high productivity.
  • the present invention also provides an image display apparatus using the surface light source element.
  • FIG. 1 is a diagram showing a preferred example of a surface light source element of the present invention.
  • FIG. 2 is a diagram showing the relationship between the position of a point light source in a plane parallel to the X axis and perpendicular to the Y axis and the intensity distribution of emitted light in the front direction of the surface light source element of FIG.
  • FIG. 3 A flat plane parallel to the X axis and perpendicular to the Y axis when three adjacent point light sources are arranged It is a figure which shows the intensity distribution of the emitted light to the position of the point light source in a surface, and each front direction.
  • FIG. 4 is a diagram showing an example of an array of a plurality of point light sources in the surface light source element of the present invention.
  • Fig. 5 An incident angle of light from the point light source on a plane parallel to the X axis and perpendicular to the Y axis.
  • FIG. 7 is a diagram showing a relation between a, the slope ⁇ of the slope of the region i in the bowl-shaped convex portion 1, and the width a of the region i in the X-axis direction.
  • FIG. 7 is a diagram showing the principle of deflecting light in the front direction with the surface light source element of the present invention.
  • FIG. 8 is a diagram showing an example of an intensity distribution in the X-axis direction of light emitted from a single point light source in a plane direction in a cross section parallel to the X-axis and perpendicular to the Y-axis. .
  • FIG. 9 The intensity distribution in the X-axis direction of the light emitted from one point light source in the front direction in a cross section parallel to the X-axis and perpendicular to the Y-axis is different from that in Fig. 8. It is a figure which shows an example
  • FIG. 10 is a diagram showing f (X) of the surface light source element shown in FIG. 8 and g (X) corresponding thereto. 11] FIG. 10 is a diagram showing f (X) of the surface light source element shown in FIG. 9 and g (X) corresponding thereto.
  • FIG. 12 is a diagram showing the traveling direction of light when light from a point light source is incident on the incident surface of the light control member of Comparative Example 2 vertically.
  • FIG. 16 is a graph showing the ratio of directional force and luminous intensity to region i out of the light traveling toward bowl-shaped convex part 1 at an angle of 0.
  • FIG. 17 It is a diagram showing an angle ⁇ at which a point light source is viewed at a point of coordinate X in a cross section parallel to the X axis and perpendicular to the Y axis.
  • Fig.18 Relationship between the position of a point light source on a plane parallel to the X axis and perpendicular to the Y axis, and the intensity distribution of the emitted light in the front direction, for a surface light source element using three types of point light sources
  • FIG. 19 is a diagram showing the influence of the first light control unit on the intensity of light emitted per unit angle in the direction of ⁇ along the axial direction.
  • FIG. 20 is a table showing configurations and results of examples and comparative examples.
  • Reflected light D i Period of array of point light sources in the X-axis direction
  • f (Y) of light from any point light source in a plane perpendicular to the x axis and parallel to the Y axis
  • N natural number
  • n Refractive index of the base material of the first light control unit
  • n s refractive index of the base material of the second light control unit
  • g (X) Minimum value of g (X) between X and X
  • g (Y) Minimum value of g (Y) between Y and Y
  • g (Y) Maximum value of g (Y) between Y and Y
  • X X coordinate center value of each element when X to X are equally divided by (2N + 1)
  • T Thickness from the incident surface of the first light control unit to the bottom of the bowl-shaped convex part 1
  • T Thickness from the incident surface of the second light control unit to the bottom of the bowl-shaped convex part 2
  • ⁇ li from the point light source to the first light controller in a plane parallel to the ⁇ axis and perpendicular to the ⁇ axis
  • ⁇ From a point light source to the second light control unit in a plane perpendicular to the axis and parallel to the axis
  • ⁇ The light direction from the point light source that is incident on the first light control unit from the point light source and exits from the exit surface on the plane parallel to the X axis and perpendicular to the Y axis is relative to the front direction.
  • ⁇ ⁇ Angle formed by a small area centered on the light with the incident angle ⁇ on the plane parallel to the X axis and perpendicular to the Y axis.
  • H ′ a point on the incident surface of the first light control unit through which light emitted from the point light source at an angle ( ⁇ ) passes in a plane parallel to the X axis and perpendicular to the Y axis, and the point light source
  • ⁇ an angle
  • V In the plane parallel to the X axis and perpendicular to the Y axis, the incident light from the point light source is centered on the incident angle ⁇ .
  • ⁇ Light incident on the first light control unit from the point light source on the plane parallel to the ⁇ axis and orthogonal to the ⁇ axis, and emitted from the ridge projection 1 to the region i of the ridge projection 1 Angle formed by ray direction with respect to normal of slope in area i
  • ⁇ a Angle at which the point light source is viewed from the coordinate X on a plane parallel to the X axis and perpendicular to the Y axis
  • L (X) Minimum luminance value in front of the surface light source element in one period along the X axis
  • L (Y) Maximum value of luminance in the front direction of the surface light source element in one cycle along the Y axis z: The cross-sectional shape of the hook-shaped convex part 1 or the hook-shaped convex part 2 when the vertex is the origin, Height coordinate
  • FIG. 1 An example of the best mode for carrying out the present invention is shown in FIG.
  • One of the normals of the X—Y plane parallel to the X axis and the Y axis perpendicular to the X axis is the front direction, and at least an emission surface parallel to the X—Y plane, a plurality of point light sources, 2
  • a plurality of sheet-like light control members, wherein the plurality of point light sources are periodically arranged in the X-axis and Y-axis directions in a virtual plane parallel to the XY plane, and are arranged on the XY plane.
  • a first light control unit comprising a plurality of convex protrusions 1 orthogonal to the X-axis direction and parallel to the Y-axis direction on the emission surface side of the two light control members Second light consisting of a plurality of hook-shaped convex portions 2 parallel to the X-axis direction and orthogonal to the Y-axis direction on the emission surface side of the two light control members System It is a surface light source element with a control unit!
  • the point light source of the present invention is not particularly limited, but an LED or the like can be used. There are white LED, red, blue, green, and other color LEDs, but only white is used, and each color LED is arranged periodically. In addition, a plurality of light sources having the same color may be arranged within one period depending on the color required on the emission surface.
  • the period in the X-axis direction and Y-axis direction is preferably 7mm to 70mm. More desirably, it is 15 mm to 50 mm.
  • FIG. 15 is a diagram showing the intensity of emitted light in the front direction and the position of the point light source in a cross section parallel to the X axis direction and perpendicular to the Y axis direction when the point light sources are arranged.
  • the intensity of emitted light in the front direction is the portion directly above each point light source 1.
  • the point light source adjacent to the directly above portion and the intermediate position portion of the point light source are greatly different.
  • the intensity of the incident light on the surface on which the light is mainly incident on the light control member is greatly different between the portion directly above the respective point light sources 1 and the obliquely upper portion. ing.
  • the difference in strength is the same in the cross section orthogonal to the X-axis direction and parallel to the Y-axis direction.
  • FIG. 2 is a diagram showing the relationship between the position of the point light source and the intensity of the emitted light in the front direction in a cross section parallel to the X axis direction and orthogonal to the Y axis direction of the surface light source element of FIG. .
  • a similar intensity distribution is shown even in a cross section orthogonal to the X-axis direction and parallel to the Y-axis direction.
  • the intensity distribution of the emitted light in the front direction is almost constant. Uniformity of luminance in the surface direction and uniformity of color can be obtained.
  • FIG. 18 shows the position of the point light source when three different types of point light sources in the cross section parallel to the X axis direction and perpendicular to the Y axis direction are arranged for three periods in the Y axis direction.
  • FIG. 6 is a diagram showing the intensity distribution of outgoing light in the respective frontal directions. For each type of point light source, if the sum of the three periods is almost constant, the brightness and color in the high front direction Uniformity is obtained.
  • the surface light source element of the present invention has a substantially uniform intensity distribution of the emitted light in the front direction, as shown in FIG. Is obtained.
  • D 30 mm
  • An example of the distribution in a cross section parallel to the X axis direction and perpendicular to the Y axis direction is shown.
  • the light emitted in the front direction from the light from one point light source is in the range of X to X. Gently as shown in Figure 8.
  • the value of X when the value of f (X) is 1/100 of the maximum value can be substituted.
  • the values of f (X) for determining X and x must be the same.
  • the ratio of g (Y) which is the minimum value of 1 max 2 and g (Y) which is the maximum value is g (Y) / g (Y)
  • g (X) / g (X) and g (Y) / g (Y) values are 0
  • More than 85 is more suitable, and in this case, a surface light source element with higher luminance uniformity and color uniformity can be obtained, and a transmissive liquid crystal panel or the like can be provided in front of the exit surface of the surface light source element.
  • a high screen quality can be obtained. In order to obtain higher screen quality, 0.90 or higher is desirable.
  • the intensity distribution of the emitted light in the front direction is determined by the sum of the three adjacent periods, so it is most desirable that g (X) be constant. At this time, light is emitted in the front direction in the range of X X, and its distribution is f (X).
  • the slope of the ramp is limited because the width of the ridge-shaped projection is limited.
  • the distribution of the outgoing light in the front direction is determined by the distribution of the degree ⁇ .
  • the cross-sectional shape in the direction has a slope angle that directs light with low energy incident from an oblique direction to the front as shown in Fig. 8. Only the light incident in the range of D ⁇ X ⁇ D without the angle ⁇
  • Frontal brightness is improved by the hook-shaped convex part 1 formed by the angle ⁇ to be directed.
  • X x like this
  • the width of X varies depending on f (X) .
  • the intensity of the emitted light is more than half of the maximum value mm 1
  • the X range can be used as a guide. If this range is large, the width of X x
  • the front brightness can be increased by suitably determining the width of X x.
  • FIG. 11 shows g (X) of the surface light source element shown for f (X) in FIG.
  • g (X) is one period of the point light source—if it is constant in the range D / 2 ⁇ X ⁇ D / 2, high brightness and color uniformity are obtained in the front direction.
  • XX is optimal
  • the brightness in the front direction becomes higher.
  • g / 2 (X) is one period of the point light source D / 2 ⁇
  • the mm max range is the same as that of the ridge-shaped convex part 1, for example, the range of Y where the intensity of the emitted light is 1/2 or more of the maximum value, and the range of ⁇ to ⁇ can be set according to this range.
  • the arrangement order of the regions N to N does not necessarily have to be along the X axis.
  • the direction of the light beam changes and does not reach the slope of angle ⁇ , or at an undesirable angle.
  • the shape of the convex part usually has no inflection point, and the entire convex part is substantially convex.
  • Such a convex portion is advantageous in that it is easy to control the direction of the light beam, in which light does not normally reach the region on the desired convex portion and the direction of the light beam changes due to reflection or refraction.
  • the arrangement order of the regions N to N is not necessarily along the X axis.
  • the shape of the convex portion does not have an inflection point, and the entire convex portion is substantially convex.
  • it is easy to control the direction of the light beam which is usually advantageous because the light reaches the region on the desired convex part and the direction of the light beam does not change due to reflection or refraction.
  • the preferred width may deviate slightly due to the height from the bottom to the surface of the protrusion. There is no significant impact. The effect of the height of the surface from the bottom of the convex part is not significant for the hook-shaped convex part 2 as well.
  • the light control member arranged closest to the light source has a thickness that does not bend or deform.
  • the light control member arranged on the most light source side varies depending on the size of the surface light source element, and the thickness is preferably 0.5 mm to 5 mm. If it is thinner than this, the light control member will bend or deform, the point light source will come into contact with the light control member, and the appearance quality will deteriorate. If it is thicker, the surface light source element becomes thicker and the weight increases. More desirably, the thickness is 1 mm to 4 mm, and more preferably 1.5 mm to 2.5 mm. In this range, the strength is maintained, and it is possible to suppress an increase in manufacturing cost due to an increase in the amount of base material used per main surface area.
  • N and N determine the number of regions into which the ridge-shaped protrusion 1 and the ridge-shaped protrusion 2 are divided.
  • 1 2 is preferably 2 or more.
  • the convex portion in the cross-sectional shape in the X-axis direction and / or the cross-sectional shape in the Y-axis direction of the bowl-shaped convex portion 2 has a complicated shape having many inclinations.
  • the number of inclinations is large, the outgoing light in the front direction can be accurately controlled, and the intensity distribution of the outgoing light in the front direction is highly uniform. From the aspect of accuracy, N and N are better, but if it is too large, the shape becomes complicated.
  • N and N force must be less than
  • At least one pair of regions forming the protrusions is adjacent to the cross-sectional shape in the X-axis direction of the hook-shaped convex portion 1 and / or the cross-sectional shape in the Y-axis direction of the hook-shaped convex portion 2.
  • the shape of the area may be approximated by a curve.
  • the shape of three or more adjacent regions may be approximated by a curve.
  • the shape of the entire convex portion may be approximated by a curve. Approximating the shape of many areas with a curve, curves the shape of adjacent areas such as smoothing the intensity distribution of outgoing light in the front direction and the angular distribution of outgoing light, shaping shading, and preventing damage. The effect of approximating with is more desirable and desirable.
  • Approximation method to a curve there are no particular limitations, and the well-known least square method, spline interpolation method, Lagrange interpolation method and the like can be used.
  • Approximation Select at least one point from the approximated area and use it more than the number of approximated areas. For example, it is possible to select both ends of a plurality of continuous regions and contact points of each region. Further, the midpoint of each region can also be used for approximation.
  • the ratio of the light emitted within 30 degrees is 50% or more, and the ratio of the light emitted within 30 degrees with respect to the front direction in the cross section parallel to the X axis direction and perpendicular to the Y axis direction is When it is 50% or more, a surface light source element having high luminance in the front direction can be obtained.
  • this value is more desirable if it is 60% or more, and more desirably 80% or more.
  • a display device that requires a wide viewing angle such as a lighting signboard
  • this value is preferably 60% to 80%.
  • the distance between the point light source and the light control member is preferably 5 to 50 mm. More desirably, it is 10 mm to 30 mm.
  • the ratio of the period of the point light source, D / H, D / H is expected to be 0.5-3.
  • the width P of the ridge-shaped protrusions and the width P of the ridge-shaped protrusions are 10 111 and 500 111, respectively. 500 ⁇ m
  • the pattern itself is visually recognized from the emission surface, and the appearance quality is lowered.
  • 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 mm 111, 400 mm 111, and more preferably 40 mm force, 300 mm. Within this range, the visibility of the pattern itself is difficult to observe, and the production becomes easier and the productivity is improved. Further, in the image display device in which the transmission type display device is provided on the exit surface side of the surface light source element of the present invention, P and P are in the range of 1/100 to 1 / 1.5 of the pixel pitch of the transmission type display device.
  • the method for producing the light control member of the present invention is not particularly limited, but may be extrusion molding or injection molding. 2P (Photo Polymerization) molding using mold and UV curable resin. However, when providing convex parts, it is necessary to select an appropriate molding method in consideration of the size of the convex parts, the shape of the convex parts, mass productivity, and the like. If the main surface is large, extrusion molding is suitable!
  • the normal hook-shaped convex part 1 and the hook-shaped convex part 2 may each be provided with a flat portion between the force S and the hook-shaped convex part 1 and / or the hook-shaped convex part 2 that are continuously arranged. .
  • the flat portion By providing the flat portion, the convex portion of the mold becomes difficult to be deformed, which is advantageous in forming the convex portion.
  • the light directly above the point light source is emitted in the front direction, it is effective in improving only the luminance directly above the point light source.
  • the flat portion when the flat portion is not provided, the light beam direction can be controlled on the entire emission surface of the first light control unit and / or the second light control unit. It is easy to make the intensity distribution uniform.
  • the cross-sectional shape in the X-axis direction of the hook-shaped convex part 1 in the first light control unit is the same shape, and the Y-axis direction of the hook-shaped convex part 2 in the second light control unit
  • the cross-sectional shape is desirably the same shape. Because the optical properties of the light control member are uniform, exact alignment is not necessary, and it is possible to immediately respond to changes in the display size and the number and arrangement of point light sources, which improves productivity.
  • a light source element can be manufactured.
  • any optically transparent material can be used.
  • Examples thereof include methacrylic resin, polystyrene resin, polycarbonate resin, cycloolefin resin, methacryl styrene copolymer resin, and cycloolefin alkene copolymer resin.
  • a reflector or the like may be used on the back surface of the light source.
  • the reflector By using the reflector, the light emitted from the light source in the back direction and the light emitted from the light control member in the back direction can be directed to the front direction, so that more light can be used and high luminance can be obtained. Is possible.
  • the reflecting plate has a function of reflecting light emitted from the light source to the back side in the front direction.
  • a reflectance of 95% or higher is desirable because of high light utilization efficiency.
  • the material of the reflector include metal foils such as aluminum, silver, and stainless steel, white coating, and foamed PET resin. In order to increase the light utilization efficiency, it is desirable that the material has a high reflectance. This includes power S such as silver and foamed PET. In order to improve brightness uniformity, the material should be diffusely reflected. Good. This includes foamed PET.
  • the light control member of the present invention may be provided with a light diffusion means.
  • a light diffusing means a method of providing random irregularities such as embossing on the main surface of the light control member, a method of providing fine particles that diffuse a small amount of light inside the structure, and a diffusion sheet as the incident surface of the light control member And a method of providing them on the side and / or the exit surface side, or a combination thereof.
  • Random irregularities can be realized by applying a solution in which fine particles are dispersed to the main surface by spraying, molding by extruding a resin in which fine particles are dispersed, and transferring from a mold having irregularities. is there.
  • the arithmetic average roughness Ra is desirably 3 m or less. If it is larger than this, the front luminance is lowered because the diffusion effect becomes too large.
  • the concentration of the fine particles can be kept very low compared to a normal diffusion plate. Any light diffusing material used in a fine particle diffusion plate or the like can be suitably used.
  • a suitable concentration of fine particles varies depending on the material. For example, 0.4% by weight of siloxane polymer particles is dispersed in a methyl styrene / methacrylate copolymer.
  • the thickness of the light control member may be set in consideration of the strength, productivity, etc. of the light control member itself! /.
  • the vicinity of the end surface is fixed together with the light control member arranged closest to the light source, so that even a thin sheet is unlikely to stagnate. Therefore, the light control member that is not closest to the light source can be made thinner than the light control member that is closest to the light source.
  • the light control member that is not closest to the light source is preferably thinner in order to reduce the thickness of the entire apparatus.
  • the force thickness varies depending on the size of the surface light source element.
  • the thickness is preferably 0.05 mm to lmm. If it is thinner than this, the strength of the light control member itself is lowered, and the quality is lowered due to deformation or the like. If it is thicker than this, the surface light source element becomes thick and the weight also increases. Furthermore, in order to prevent deformation of the light control member due to heat, etc., and to obtain high productivity by extrusion molding, etc., 0.1 mm to 0.7 mm is more desirable, and 0.2 mm force, 0.5 mm is more desirable. desirable.
  • a transparent support substrate made of resin, glass or the like is stacked on the light source side of the light control member. It may be provided. By disposing the support substrate, it is possible to support the light control member even if the light control member is made as thin as 0.1 mm to 1 mm, for example. By making the light control member thinner, molding by extrusion molding or the like becomes easier and productivity is improved. In addition, it becomes easier to support a light control member that becomes increasingly difficult as the surface light source element becomes larger.
  • the thickness of the support substrate is not particularly limited, but is usually from 1 mm to 5 mm, and more preferably from 2 mm to 4 mm from the viewpoint of weight reduction and strength.
  • the supporting substrate may be improved in diffusibility by dispersing fine particles for diffusing light therein, embossing on the surface, or applying fine particles.
  • a suitable material that is preferable in production that the base material is a thermoplastic resin is equivalent to the light control member.
  • the support substrate may be bonded to the light control member, for example, it can be bonded with a transparent adhesive or the like, thereby simplifying the process of assembling the surface light source elements and further shifting the light control member. And generation of wrinkles can be prevented.
  • Equation (8) can be derived by approximating according to the thickness ratio. For example, if the part of the support substrate consists of three plates with refractive indices n ', n' ', n' '' and plate thicknesses T ', ⁇ ' ', ⁇ ' '', ⁇ is ( ⁇ ' ⁇ ' + ⁇ " ⁇ ⁇ " + ⁇ "' ⁇ ⁇ "') / ⁇
  • a diffusion sheet may be used in order to obtain more uniform brightness and color uniformity
  • a prism sheet, a deflection separation film, or the like may be used in order to obtain high frontal brightness.
  • the light control member of the present invention can also be used for light sources other than a plurality of point light sources. For example, uniform and high brightness can be obtained in a wider range by using a single point light source.
  • the light control unit included in the light control member of the present invention includes a plurality of linear light sources arranged in a virtual plane parallel to the X plane and parallel to the X axis direction and along the vertical axis, or the axial direction Linear light sources arranged along the X axis parallel to the X axis It is possible to control the direction of light rays from the light source, and high luminance uniformity can be realized.
  • these linear light sources it is also possible to use a linear light source configured by linearly arranging fluorescent light sources or point light sources such as LEDs at narrow intervals.
  • 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. As a result, it is possible to obtain an image display device that has high luminance uniformity and color uniformity with high luminance on the display surface and good color reproducibility.
  • the configuration of the surface light source element of this example is as shown in the schematic diagram of FIG.
  • the period is the distance from the position where the red LED is placed in the X-axis direction to the position where the red LED is placed, and D is the place where the red LED is placed in the Y-axis direction.
  • the light control member is disposed in the order of the first light control member and the second light control member in the front direction at a position 20 mm from the light emitting surface of the light source in the front direction.
  • the distance H from the light emitting surface of the light source to the incident surface of the first light control unit is 20 mm
  • the distance H from the light emitting surface of the light source to the incident surface of the second light control unit is 23 mm.
  • a 95% reflective plate made of foamed PET resin is installed on the back side.
  • a light control member 1 1 6 having a first light control unit, a light control member 2— ;! 2-7 having a second light control unit, and Produced by the method
  • an ultraviolet curable resin (refractive index 1.) was obtained from a mold in which groove-shaped concave portions having a width of 60 in were continuously formed by cutting. 55) A 2 mm thick polystyrene resin (refractive index 1.60) substrate is formed with a ridge-shaped convex part. 1 light control unit is produced. Similarly, in order to obtain the ridge-shaped convex part 2, from a mold in which groove-shaped concave parts having a width of 60 11 m are continuously formed in parallel by cutting, the thickness is increased with an ultraviolet curable resin (refractive index 1.55). the ridge-shaped protrusions formed 0.
  • Each region N to N with a defined slope ⁇ and width a in the radial direction is defined as the region shown in Table 1.
  • the intensity distribution of the emitted light in the front direction is evaluated by measuring the distribution of the front luminance.
  • the front brightness is measured by using a luminance meter (Topcon Co., Ltd., BM-7) with a measurement angle range of 0.2 degrees, moving the measurement distance constant, and moving by lmm along the X axis where the point light sources are arranged. Measure for one cycle. Also, measure for one cycle while moving by lmm in the Y-axis direction.
  • Luminance uniformity in the X-axis direction is the ratio of L (X), which is the minimum value of luminance in one cycle measured in the X-axis direction, to L (X), which is the maximum value.
  • the ratio of the light emitted in the front direction is determined by measuring the luminance distribution for each angle, converting the obtained luminance into energy, Calculate the percentage of total energy.
  • the luminance distribution for each angle is obtained by measuring the same luminance with a luminance meter (BM-9 manufactured by Topcon Co., Ltd.) attached to the rotating table, with a measurement angle range of 0.2 degrees, and a constant measurement distance. taking measurement.
  • BM-9 manufactured by Topcon Co., Ltd.
  • a transmissive liquid crystal panel is arranged in the front direction of the exit surface of the surface light source element of this embodiment, and the screen quality and the brightness of the screen are observed.
  • the image of the point light source is reduced on the emission surface, and the luminance in the front direction is reduced.
  • the uniformity of color and the uniformity of color are improved. Furthermore, since the ratio of light emitted in the front direction where the light use efficiency is high is increased, the luminance in the front direction is high.
  • the diffusion plate was produced by extruding a methyl methacrylate-styrene copolymer resin in which 1.9% by weight of cyclohexane-based polymer particles were dispersed as fine particles for diffusing light. Evaluation was carried out when a diffusion sheet was arranged in the front direction of the diffusion plate containing fine particles. In this case, the luminance uniformity is low because the light source image is not sufficiently reduced. Further, since the light utilization efficiency is low, high front luminance is not obtained. In addition, when a transmissive liquid crystal panel is placed in the front direction of the emission surface of the surface light source element and observed, the light source image is remarkably observed and the screen quality is poor. In addition, the screen is dark because there is little light going to the front.
  • hook-shaped convex part 1 and hook-shaped convex part 2 are hook-shaped prisms having an apex angle of 90 degrees.
  • the luminance is greatly reduced in the portion directly above the light source, and the luminance uniformity is poor.
  • the brightness is uniform for different color light sources!
  • a transmissive liquid crystal panel is placed in front of the exit surface of the surface light source element and observed, the image quality is poor because the light source image is not reduced.
  • Figs. 12 and 13 show the principle of light control performed by the prism having a vertex angle of 90 degrees, which is mentioned as Comparative Example 2.
  • FIG. 12 since all the light 7 incident on the prism 10 from the front direction is totally reflected and returns to the light source side, the amount of transmitted light at the position of the light source is zero.
  • FIG. 13 since the light 7 incident on the prism 10 from an oblique direction is refracted by the prism and deflected near the front direction, the amount of transmitted light is large. Therefore, the brightness uniformity cannot be obtained with the prism mentioned as Comparative Example 2.
  • the luminance is high and the luminance uniformity is poor just above the light source in the Y-axis direction. Furthermore, the luminance is not uniform for the light sources of different colors, and the color is emphasized at the location of the light source of each color, and the color uniformity is poor. In addition, when a transmissive liquid crystal panel is placed in the front direction of the exit surface of this surface light source element, the luminance and color uniformity are low, so the screen quality is poor!
  • a lenticular lens made up of a part of an arc whose cross-sectional shape is expressed by the formula (31) as the ridge-shaped convex portion 1 and the ridge-shaped convex portion 2 is disposed on the light exit surface side of the light control member.
  • An evaluation was conducted when the wrench sheet 1 was used. In this case, since the direction of the light emitted from the light control member and the amount of light are not controlled, the luminance and color uniformity are not sufficient to reduce the light source image sufficiently. Further, when a transmissive liquid crystal panel is placed in front of the exit surface of the surface light source element and observed, the light source image is recognized remarkably, and the screen quality is poor due to low luminance and color uniformity.
  • P Position coordinate in the X-axis direction or Y-axis direction of the cross-sectional shape of bowl-shaped convex part 1 or bowl-shaped convex part 2 when the top is the origin
  • ⁇ Coordinates in the height direction of the cross-sectional shape of hook-like convex part 1 or hook-like convex part 2 when the vertex is the origin
  • ⁇ Position coordinate in the X-axis direction or ⁇ -axis direction of the cross-sectional shape of the ridge-shaped convex part 1 or ridge-shaped convex part 2 when the top is the origin

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne un élément à source lumineuse planaire qui inclut un élément de commande de lumière possédant une première unité de commande de lumière formée par une pluralité de parties convexes à rainures (1) et une seconde unité de commande de lumière formée par une pluralité de parties convexes à rainures (2). On suppose que la longueur d'un cycle de sources lumineuses en forme de point dans la direction de l'axe X est D1, la longueur d'un cycle de la source lumineuse en forme de point dans la direction de l'axe Y est D2, la distance entre les sources lumineuses en forme de point et la première unité de commande est H1, la distance entre les sources lumineuses en forme de point et la seconde unité de commande est H2, la position centrale d'une source lumineuse en forme de point sélectionnée arbitrairement est une origine, la coordonnée de position dans la direction de l'axe X est X, et la coordonnée de position dans la direction de l'axe Y est Y. Le rapport entre la valeur maximale et la valeur minimale de l'intensité d'émission lumineuse de la lumière incidente dans la première unité de commande de lumière dans la direction vers la surface avant au niveau de X et l'intensité d'émission lumineuse de la lumière incidente dans la seconde unité de commande de lumière dans la direction vers la surface avant au niveau de Y en trois cycles n'est pas inférieur à 0,8. La section transversale des parties convexes à rainures (1) dans la direction X possède une forme profilée possédant différentes inclinaisons exprimées par D1, H1, X et la section transversale des parties convexes à rainures (2) dans la direction Y possède une forme profilée possédant différentes inclinaisons exprimées par D2, H2, Y.
PCT/JP2007/067490 2006-09-08 2007-09-07 Élément à source lumineuse planaire, élément de commande de lumière et dispositif d'affichage d'image utilisant celui-ci WO2008029911A1 (fr)

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JP2010044941A (ja) * 2008-08-12 2010-02-25 Sony Corp 照明装置および表示装置
CN102818193A (zh) * 2012-08-20 2012-12-12 创维液晶器件(深圳)有限公司 一种直下式led背光模组及其显示装置
JP2018073668A (ja) * 2016-10-31 2018-05-10 株式会社クラレ 面光源素子
US10345647B2 (en) 2015-07-30 2019-07-09 Nichia Corporation Surface light source device and transmission display device

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TWI407055B (zh) * 2008-10-17 2013-09-01 Hon Hai Prec Ind Co Ltd 照明裝置
TWI404892B (zh) * 2008-10-24 2013-08-11 Hon Hai Prec Ind Co Ltd 照明裝置
TWI706209B (zh) * 2019-11-12 2020-10-01 茂林光電科技股份有限公司 利於區段調光之導光板
WO2023133687A1 (fr) * 2022-01-11 2023-07-20 Hefei Raysees Ai Technology Co., Ltd. Module de rétroéclairage et dispositif d'affichage ii

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JP2006018261A (ja) * 2004-06-30 2006-01-19 Lg Phillips Lcd Co Ltd 液晶表示装置のバックライトデバイス及びこれを利用した液晶表示装置
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US10345647B2 (en) 2015-07-30 2019-07-09 Nichia Corporation Surface light source device and transmission display device
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