WO2012036161A1 - Unité de plaque de commande de lumière, dispositif de source de lumière planaire, et dispositif d'affichage d'image transmissif - Google Patents

Unité de plaque de commande de lumière, dispositif de source de lumière planaire, et dispositif d'affichage d'image transmissif Download PDF

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Publication number
WO2012036161A1
WO2012036161A1 PCT/JP2011/070876 JP2011070876W WO2012036161A1 WO 2012036161 A1 WO2012036161 A1 WO 2012036161A1 JP 2011070876 W JP2011070876 W JP 2011070876W WO 2012036161 A1 WO2012036161 A1 WO 2012036161A1
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WIPO (PCT)
Prior art keywords
light
light control
control plate
axis
convex portion
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PCT/JP2011/070876
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English (en)
Japanese (ja)
Inventor
寛史 太田
川口　裕次郎
武志 川上
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住友化学株式会社
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Publication of WO2012036161A1 publication Critical patent/WO2012036161A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to a light control plate unit, a surface light source device, and a transmissive image display device.
  • a direct type image display device 40 which is an example of a transmission type image display device, for example, as shown in FIG. 12, a device in which a light source 43 is arranged on the back side of the transmission type image display unit 10 is widely used.
  • the transmissive image display unit 10 include a liquid crystal display panel in which linearly polarizing plates 12 and 13 are disposed on both surfaces of a liquid crystal cell 11.
  • the light source 43 a plurality of linear light sources such as a straight tube type cold cathode ray tube are arranged in parallel with each other.
  • the direct image display device 40 can uniformly illuminate the transmissive image display unit 10 by uniformly dispersing light from the light source 43, and for this reason, between the light source 43 and the transmissive image display unit 10.
  • a light control plate 42 such as a single light diffusing plate having a function of changing the direction of light incident from the light source 43 side and emitting it from the opposite transmissive image display unit 10 side is used. (For example, see Patent Document 1: JP-A-7-198913). Since the light output from the light source 43 is emitted as planar light by the light control plate 42, the light source 43 and the light control plate 42 constitute a surface light source device 41.
  • the light emitting diode is usually a point light source, and is used by arranging it in a discrete manner.
  • the light control plate of the conventional surface light source device is used in a direct type image display device in combination with a point light source such as a light emitting diode, the light from the point light source may be sufficiently uniform.
  • the image displayed by the transmissive image display unit has a problem that the brightness differs between the vicinity of the point light source and the position away from the point light source.
  • an object of the present invention is to provide a surface light source device, a light control plate unit, and a transmissive image display device capable of sufficiently uniformly dispersing light from a point light source.
  • the surface light source device includes a plurality of point light sources and a light control plate unit provided on the plurality of point light sources.
  • the point light source included in the surface light source device according to the present invention has a light distribution characteristic having a maximum emission light intensity I max in a range of light emission angles of 70 ° to 80 °, and (A) the emission angle is 0.
  • the emitted light intensity I 0 in the case of ° is 0.12 ⁇ I max ⁇ I 0 ⁇ 0.20 ⁇ I max
  • the emission angle at which the emission light intensity is (I 0 + I max ) / 2 is 60 ° or more and 70 ° or less, and (C) the emission light intensity is (I 0 + I max ) / 4.
  • the light distribution characteristic is such that the emission angle becomes 47.5 ° or more and 57.5 ° or less.
  • the light control plate unit included in the surface light source device according to the present invention can emit light incident from the first surface from the second surface located on the side opposite to the first surface, and
  • the first to third light control plates each having a plurality of convex portions extending in the direction and arranged in parallel in a direction substantially orthogonal to the one direction are provided on the second surface.
  • the thickness of the first light control plate, the second light control plate, and the third light control plate is such that the third light control plate is positioned above the second light control plate.
  • the first surface of the third light control plate is located on the second surface side of the second light control plate, and
  • the second light control plate is provided on the second surface side of the second light control plate.
  • the extending direction of the convex portion of the first light control plate is substantially parallel to the extending direction of the convex portion of the third light control plate, and (G) the extending direction of the convex portion of the first light control plate. And the extending direction of the convex portion of the second or third light control plate are substantially orthogonal to each other.
  • an axis passing through both ends in a cross section perpendicular to the extending direction of each of the convex portions of the first to third light control plates is defined as a u axis, and the center between the both ends on the u axis is defined as the u axis.
  • each convex portion of the control plate is represented by v (u) satisfying the following formula (1) when ⁇ 0.475 w a ⁇ u ⁇ 0.475 w a .
  • h a is a constant that satisfies 0.40 w a or more and 1.60 w a or less with respect to the convex portion of the first light control plate, and k a is ⁇ 1.00 or more and is a constant satisfying 0.25 or less.
  • h a is, 0.32 W a more 0.97W a
  • k a is a constant satisfying ⁇ 1.00 and 0.75.
  • the second light control plate converts light from the point light source having the above-described light distribution characteristics into linear light with uniform luminance. Can be converted to Similarly, since the convex portions of the second and third light control plates have the above-described cross-sectional shape, the second and third light control plates are arranged on the point light source. When the extending directions of the convex portions of the light control plate are arranged substantially in parallel, the light from the point light source can be converted into linear light with uniform luminance.
  • the extending direction of the convex portion of the first light control plate and the extending direction of the convex portion of the second or third light control plate are substantially orthogonal to each other.
  • a first light control plate and a set of second and third light control plates are arranged.
  • the light of the point light source incident on the light control plate unit has a uniform luminance in a direction substantially orthogonal to each other by the first light control plate and the set of the second and third light control plates. Converted to linear light.
  • the surface light source device emits the light from the point light source as planar light that is uniformly dispersed and has high luminance uniformity on the surface perpendicular to the plate thickness direction. Is possible.
  • the first surface of each of the first to third light control plates can be substantially flat.
  • a transmissive image display device includes a plurality of point light sources, a light control plate unit provided on the plurality of point light sources, and provided on the light control plate unit, and is emitted from the light control plate unit.
  • a transmissive image display unit that displays an image by being irradiated with the emitted light.
  • the point light source included in the transmissive image display device according to the present invention has a light distribution characteristic in which the light emission angle has a maximum emission light intensity I max in a range of 70 ° to 80 °, and (a) the emission angle.
  • the emitted light intensity I 0 when is 0 ° is 0.12 ⁇ I max ⁇ I 0 ⁇ 0.20 ⁇ I max
  • the emission angle at which the emission light intensity is (I 0 + I max ) / 2 is 60 ° or more and 70 ° or less, and (c) the emission light intensity is (I 0 + I max ) / 4.
  • the light distribution characteristic is such that the emission angle becomes 47.5 ° or more and 57.5 ° or less.
  • the light control plate unit included in the transmissive image display device can emit light incident from the first surface from the second surface located on the opposite side of the first surface, and
  • the first to third light control plates each having a plurality of convex portions extending in one direction and arranged in parallel in a direction substantially orthogonal to the one direction are provided on the second surface.
  • the thickness of the first light control plate, the second light control plate, and the third light control plate is such that the third light control plate is positioned above the second light control plate.
  • the first surface of the third light control plate is located on the second surface side of the second light control plate, and (f) the second light control plate.
  • the extending direction of the convex portion of the first light control plate is substantially parallel to the extending direction of the convex portion of the third light control plate, and (g) the extending direction of the convex portion of the first light control plate. And the extending direction of the convex portion of the second or third light control plate are substantially orthogonal to each other.
  • an axis passing through both ends in a cross section perpendicular to the extending direction of each of the convex portions of the first to third light control plates is defined as a u axis, and the center between the both ends on the u axis is defined as the u axis.
  • each convex portion of the control plate is represented by v (u) that satisfies the following expression (3) when ⁇ 0.475 w a ⁇ u ⁇ 0.475 w a .
  • h a is a constant that satisfies 0.40 w a or more and 1.60 w a or less with respect to the convex portion of the first light control plate, and k a is ⁇ 1.00 or more and is a constant satisfying 0.25 or less.
  • h a is, 0.32 W a more 0.97W a (K a is a constant satisfying ⁇ 1.00 and 0.75)
  • the second light control plate converts light from the point light source having the above-described light distribution characteristics into linear light with uniform luminance. Can be converted to Similarly, since the convex portions of the second and third light control plates have the above-described cross-sectional shape, the second and third light control plates are arranged on the point light source. When the extending directions of the convex portions of the light control plate are arranged substantially in parallel, the light from the point light source can be converted into linear light with uniform luminance.
  • the extending direction of the convex portion of the first light control plate is substantially orthogonal to the extending direction of the convex portion of the second or third light control plate.
  • a first light control plate and a set of second and third light control plates are arranged.
  • the light of the point light source incident on the light control plate unit has a uniform luminance in a direction substantially orthogonal to each other by the first light control plate and the set of the second and third light control plates. Converted to linear light.
  • the light control plate unit disperses the light from the point light source uniformly and emits it as planar light that is planar light and has high luminance uniformity on the surface orthogonal to the plate thickness direction. It is possible.
  • the light control plate unit can emit light incident from the first surface from the second surface located on the opposite side of the first surface, and extends in one direction.
  • the first light control plate, the second light control plate, and the second light control plate have a plurality of convex portions arranged in parallel in a direction substantially orthogonal to one direction.
  • the light control plate and the third light control plate are provided in the plate thickness direction so that the third light control plate is located above the second light control plate.
  • 1 surface is located on the second surface side of the second light control plate, the extending direction of the convex portion of the second light control plate and the extension of the convex portion of the third light control plate.
  • the extending direction of the convex portion included in the first light control plate is substantially orthogonal to the extending direction of the convex portion included in the second or third light control plate.
  • Have first to third light control plate In the cross section orthogonal to the extending direction of each of the convex portions, an axis passing through both ends is defined as a u axis, and an axis passing through the center between the both ends on the u axis and orthogonal to the u axis is defined as a v axis.
  • h a is, 0.32 W a more 0.97W a is a constant that satisfies the following, k a is a constant satisfying -1.00 or more and 0.75 or less.
  • k a is a constant satisfying -1.00 or more and 0.75 or less.
  • each of the first and second light control plates of the light control plate unit has a plurality of convex portions formed on the second surface. Since the convex portion of each of the first and second light control plates has a cross-sectional shape represented by v (u) that satisfies the above formula (5), the first and second light control plates are The light from the point light source having the light distribution characteristics described above can be converted into light that is linear light and has substantially uniform brightness in the extending direction.
  • the light control board unit which concerns on this invention, it arrange
  • a surface light source device a light control plate unit, and a transmissive image display device that can sufficiently uniformly disperse light from a point light source.
  • FIG. 6 is a view for explaining a cross-sectional shape of a convex portion included in the second and third light control plates of the light control plate unit shown in FIG. 5. It is drawing for demonstrating the conditions which the cross-sectional shape of the convex part which the 2nd and 3rd light control board of the light control board unit shown in FIG. 5 has satisfies. It is a perspective view which shows other embodiment of a light-control board unit. It is a perspective view which shows other embodiment of a light-control board unit. It is sectional drawing which shows typically the structure of the conventional transmissive image display apparatus.
  • FIG. 1 is a cross-sectional view schematically showing a configuration of an embodiment of a transmissive image display device according to the present invention.
  • FIG. 1 shows the transmissive image display device 1 in an exploded manner.
  • the transmissive image display device 1 includes a transmissive image display unit 10 and a surface light source device 20 disposed on the back side of the transmissive image display unit 10 in FIG.
  • the arrangement direction of the surface light source device 20 and the transmissive image display unit 10 is referred to as a z direction (plate thickness direction), which is two directions orthogonal to the z direction and orthogonal to each other. Two directions are referred to as an x direction and a y direction.
  • the transmissive image display unit 10 examples include a liquid crystal display panel in which linearly polarizing plates 12 and 13 are disposed on both surfaces of a liquid crystal cell 11.
  • the transmissive image display device 1 is a liquid crystal display device (or a liquid crystal television).
  • the liquid crystal cell 11 and the polarizing plates 12 and 13 those used in the transmissive image display device 1 such as a conventional liquid crystal display device can be used.
  • the liquid crystal cell 11 include known liquid crystal cells such as TFT type and STN type.
  • the surface light source device 20 is a so-called direct type surface light source device.
  • the surface light source device 20 includes a light diffusing plate unit (light control plate unit) 21A and a plurality of point light sources 22 arranged on the back side in FIG.
  • Light diffusing plate unit 21A includes a first light diffusing plate 30 1, a second light diffusion plate 30 2 and the third light diffusing plate 30 3 arranged in this order in the thickness direction (z-direction).
  • the first to third light diffusing plates 30 1 to 30 3 constituting the light diffusing plate unit 21A have substantially the same shape in plan view (the shape seen from the z direction), and are usually rectangular.
  • the planar view shape of the first to third light diffusion plates 30 1 to 30 3 in other words, the size of the planar view shape of the light diffusion plate unit 21 A matches the target screen size of the transmissive image display device 1. Usually, it is 250 mm ⁇ 440 mm or more, preferably 1020 mm ⁇ 1800 mm or less.
  • the shape of the first to third light diffusion plates 30 1 to 30 3 in plan view is not limited to a rectangle but may be a square, but in the following, it will be described as a rectangle unless otherwise specified.
  • FIG. 2 is a drawing showing an example of the arrangement relationship of a plurality of point light sources.
  • the plurality of point light sources 22 can be arranged at equal intervals L x in the x direction and at equal intervals L y in the y direction.
  • the interval Lx in the x direction is larger than the interval Ly in the y direction, but the interval Ly may be larger than the interval Lx, or the interval Lx and the interval Ly may be the same.
  • the interval Lx and the interval Ly can be the distance between the light emitting portions of the point light source 22, and are usually 10 mm to 150 mm.
  • the plurality of point light sources 22 may be arranged in a staggered pattern shown in FIG. Since FIG. 3 can be regarded as a modification of the case of FIG. 2, the distance between the point light sources 22 in the x direction and the y direction can be the same as in the case of FIG. This will be specifically described.
  • the rectangular lattice shown in FIG. 2 can be regarded as a plurality of point light source arrays composed of a plurality of point light sources 22 arranged in the x direction arranged in parallel in the y direction.
  • the staggered arrangement in FIG. 3 is such that adjacent point light source arrays out of a plurality of point light source arrays arranged in the y direction are arranged with a half cycle shift in the x direction. Therefore, also in the arrangement shown in FIG. 3, the interval Ly in the y direction can be the same as the case shown in FIG. 2, that is, the interval between the point light source arrays arranged in parallel in the y direction.
  • the adjacent point light source arrays out of the point light source arrays arranged in parallel in the y direction are shifted by a half cycle in the x direction.
  • the x direction and the y direction are opposite. There may be.
  • FIG. 4 is a diagram showing an example of a light distribution of a point light source included in the surface light source device.
  • the horizontal axis of FIG. 4 indicates the outgoing angle ⁇ (°), and the vertical axis indicates the normalized outgoing light intensity normalized by the maximum outgoing light intensity.
  • the point light source 22 is a so-called side emitting light source, and an example of the point light source 22 is a light emitting diode.
  • the point light source 22 has a light distribution characteristic (directional characteristic) that satisfies the following conditions.
  • the outgoing angle ⁇ 1 (hereinafter referred to as peak angle ⁇ 1 ) of the maximum outgoing light intensity I max where the outgoing light intensity is maximum is in the range of 70 ° to 80 °.
  • the intensity of emitted light increases substantially monotonically from the front direction (emitted angle ⁇ is 0 °) to the peak angle ⁇ 1 .
  • I 0 is 0.12 ⁇ I max ⁇ I 0 ⁇ 0.20 ⁇ I max Meet.
  • the outgoing angle ⁇ 2 at which the outgoing light intensity is (I max + I 0 ) / 2 is in the range of 60 ° to 70 °.
  • the outgoing angle ⁇ 3 at which the outgoing light intensity is (I max + I 0 ) / 4 is in the range of 47.5 ° to 57.5 °.
  • FIG. 5 is a perspective view for illustrating a configuration of a light diffusion plate unit (light control plate unit).
  • first to third light diffusion plates 30 1 , 30 2 , 30 3 constituting the light diffusion plate unit 21A will be described.
  • first to third light diffusing plate 30 1-30 3 as described later, the second to the first upper light diffusion plate 30 1
  • the third light diffusing plates 30 2 and 30 3 may be provided so that two adjacent plates contact each other.
  • the first light diffusion plate 30 1, 1 a substantially planar lower surface (first surface of the first light control plate) 31, the outer convex portion is convex (second light diffusion plate 30 2 side) it is a (first convex portion of the light control plate) 33 1 is formed with a plurality of upper surface (second surface of the first light control plate) 32 1 and the plate-like body having a.
  • the first light diffusion plate 30 1 is, for example, a light diffusion plate for dispersing the light by the difference of the emission position of the light from the convex portion 33 1.
  • the first light diffusion plate 30 since the deflecting direction of light emission by emitting position of light from the convex portion 33 1, deflecting plate both the shape to adjust the deflection of the light is applied I can say that.
  • plate although referred to as “plate”, it may be in the form of a sheet or film depending on the thickness.
  • Convex portion 33 1 extends substantially parallel to the Y1 direction in the y-direction (first direction of the first light control plate), first in the X1 direction (the first light control plate which is substantially perpendicular to the Y1 direction 2 direction).
  • the X1 direction and the Y1 direction are preferably parallel to the x direction and the y direction, respectively, but may be shifted by about ⁇ 10 ° due to, for example, a manufacturing error.
  • the cross-sectional shape of the plurality of convex portions 33 1 is substantially the same between the convex portions 33 1 . Further, in the extending direction of the convex portion 33 1, the cross-sectional shape is substantially uniform.
  • the ends 33a 1 and 33a 1 of the two adjacent convex portions 33 1 and 33 1 are at the same position in the X1 direction.
  • First thickness d1 of the light diffusion plate 30 1 is a z-direction distance between the top portion 33b 1 of the lower surface 31 1 and the convex portion 33 1, typically a 0.1 mm ⁇ 5 mm.
  • the second light diffusion plate 30 2 is substantially the (first surface of the second light control plate) 31 2 flat lower surface, an outer convex portion is (third light diffuser 30 3 side) in a convex is a (second convex portion of the light control plate) 33 2 is formed with a plurality of upper surface (second second surface of the light control plate) 32 2 and the plate-like body having a.
  • the second light diffusion plate 30 for example, a light diffusion plate for dispersing the light by the difference of the emission position of the light from the convex portion 33 1.
  • the second light diffusion plate 30 since the deflecting direction of light emission by emitting position of light from the convex portion 33 2, deflecting plate both the shape to adjust the deflection of the light is applied I can say that.
  • plate although referred to as “plate”, it may be in the form of a sheet or film depending on the thickness.
  • Convex portion 33 2 extend in substantially parallel direction X2 in the x-direction (first direction of the second light control plate), first in the Y2 direction (the second light control plate substantially orthogonal to the X2 direction 2 direction).
  • X2 direction and the Y2 direction is parallel to the x and y directions, respectively, but as in the case of the first light diffuser 30 1, for example due to a manufacturing error or the like may be offset about ⁇ 10 °.
  • Cross-sectional shape of the plurality of convex portions 33 2 is substantially same in the convex portion 33 2. Further, in the extending direction of the convex portion 33 2, the cross-sectional shape is substantially uniform. End 33a 2 of two adjacent convex portions 33 2, 33 2 are in the same position in the Y2 direction.
  • the second thickness d2 of the light diffusion plate 30 2 is a z-direction distance between the top portion 33b 2 of the lower surface 31 2 and the convex portion 33 2, typically a 0.1 mm ⁇ 5 mm.
  • plate it may be in the form of a sheet or film depending on the thickness.
  • Convex portion 33 3 extends substantially parallel to the direction X3 in the x-direction (first direction of the third light control plate), first of Y3 direction (third light control plate substantially perpendicular to the direction X3 2 direction). It is preferred X3 direction and Y3 direction is parallel to the x and y directions, respectively, but as in the case of the first light diffuser 30 1, for example due to a manufacturing error or the like may be offset about ⁇ 10 °.
  • Cross-sectional shape of the plurality of convex portions 33 3 are substantially same in the convex portion 33 3. Further, in the extending direction of the convex portion 33 3, the cross-sectional shape is substantially uniform.
  • the ends 33a 3 and 33a 3 of the two adjacent convex portions 33 3 and 33 3 are at the same position in the Y3 direction.
  • Third thickness d3 of the light diffusion plate 30 3 are the z-direction distance between the lower surface 313 and the convex portion 33 3 of the top 33b 3, usually a 0.1 mm ⁇ 5 mm.
  • Convex portion 33 1 when placing the first light diffusing plate 30 1 on the point light source 22 having a light distribution characteristic which has been described with use of FIG. 4, the light from the point light source 22, luminance Has a cross-sectional shape that can be converted into substantially uniform linear light.
  • the cross-sectional shape of the convex portion 33 1 will be described with reference to FIG.
  • U I axis direction with respect to the convex portion 33 1 corresponds to the X1 direction
  • v I axis (v-axis) direction corresponds to the z-direction.
  • the cross-sectional shape of the convex portion 33 1 has both ends 33a 1 and 33a 1 on the u I axis.
  • Convex portion 33 1 of the contour line is represented by v I (u I) that satisfies the following expression (7).
  • w Ia is the length of the convex portion 33 1 of u I axis.
  • h Ia corresponds to the maximum height between two ends 33a 1, 33a 1 of the convex portion 33 1, h Ia is a constant satisfying the following 0.40 W Ia or 1.60 W Ia.
  • h Ia is a constant that satisfies h Ia / w Ia from 0.40 to 1.60.
  • k Ia is a constant satisfying ⁇ 1.00 or more and 0.25 or less.
  • Figure 6 illustrates a predetermined factor only stretch shape equation v I0 (u I) within a range satisfying (7) in the v I direction as an example of the cross-sectional shape of the convex portion 33 1.
  • the convex portion 33 1 has a symmetrical contour relative to v I axis.
  • the sectional shape of the convex portion 33 as shown in FIG.
  • the cross-sectional shape of the convex portion 33 1 is to be represented by v I (u I) satisfying the equation (7).
  • the cross-sectional shape of the convex portion 33 1 in -0.475w Ia ⁇ u I ⁇ 0.475w Ia need only be represented by the formula (7) satisfies the v I (u I).
  • the range of h Ia / w Ia and k Ia only needs to satisfy the above-described range.
  • the distance between two adjacent point light sources 22 is L, and the light diffusing plate from the light emitting part of the point light source 22 is used.
  • h Ia / preferable for L / D is D, h Ia / preferable for L / D.
  • the ranges of w Ia and k Ia are as shown in Table 1 below.
  • L described in Table 1 is Lx for contour shape of the convex portion 33 1.
  • the convex portions 33 2 and 33 3 are provided with the second and third light control plates 30 2 and 30 3 in this order on the point light source 22 having the light distribution characteristics described with reference to FIG.
  • the shape portions 33 2 and 33 3 When the shape portions 33 2 and 33 3 are arranged with their extending directions substantially parallel, they have a cross-sectional shape that can convert light from the point light source 22 into linear light having substantially uniform luminance.
  • the cross-sectional shapes of the convex portions 33 2 and 33 3 will be described with reference to FIG.
  • the convex portions 33 2 and 33 3 will be referred to as convex portions 33 i (i is 2 or 3) unless otherwise specified.
  • the u II v II coordinate system is set with the direction orthogonal to the extending direction of the convex portion 33 i as the u II axis (u axis).
  • v II axis corresponding to the convex portion 33 2 and the convex portion 33 3 (v-axis) direction both correspond to the z-direction.
  • the cross-sectional shape of the convex portion 33 i has both ends 33 a i and 33 a i on the u II axis.
  • the contour line of the convex portion 33 i is represented by v II (u II ) that satisfies the following formula (9).
  • w IIa is the length of the convex portion 33 i in the u II axis direction.
  • h IIa corresponds to the maximum height between the two ends 33a i, 33a i of the convex portion 33 i, h IIa is a constant satisfying the following 0.32 W IIa or 0.97w IIa.
  • h IIa is a constant that satisfies h IIa / w IIa from 0.32 to 0.97.
  • k IIa is a constant satisfying ⁇ 1.00 or more and 0.75 or less.
  • Width w IIa of the convex portion 33 i since formation of the convex portion 33 i is easy, usually 40 ⁇ m or more, preferably 250 ⁇ m or more, the pattern caused by the convex portion 33 i is visible to the naked eye Since it is difficult, it is usually 800 ⁇ m or less, preferably 450 ⁇ m or less.
  • FIG. 8 illustrates a shape in which v II0 (u II ) is expanded and contracted by a predetermined multiple in the v II direction within the range satisfying Expression (9) as an example of the cross-sectional shape of the convex portion 33 i .
  • the convex portion 33 i has a symmetrical contour relative v II axis.
  • the cross-sectional shape of the convex portion 33 i is represented by v II (u II ) that satisfies the formula (9).
  • the cross-sectional shape of the convex portion 33 i in -0.475w IIa ⁇ u II ⁇ 0.475w IIa need only be represented by the formula (9) satisfies the v II (u II).
  • the range of h IIa / w IIa and k IIa only needs to satisfy the above-described range.
  • the distance between two adjacent point light sources 22 is L, and the light diffusing plate from the light emitting portion of the point light source 22 is used.
  • the distance to the surface of the unit 21A on the point light source 22 side is D
  • the ranges of w IIa and k IIa are shown in Table 2.
  • L shown in Table 2 is Ly for the contour shape of the convex portions 33 2 and 33 3 .
  • Convex portion 33 2 of the second and third light diffusion plate 30 2 and 30 3, 33 3 w IIa, h IIa, k IIa is preferably the same between the respective convex portions 33 2, 33 3 But it can be different. That is, it is preferable that the cross-sectional shapes of the convex portions 33 2 and 33 3 included in each of the second and third light diffusion plates 30 2 and 30 3 are the same cross-sectional shape. Different cross-sectional shapes may be used as long as the contour lines of the cross-sectional shapes of 33 2 and 33 3 satisfy the above formula (9).
  • the first to third light diffusion plates 30 1 to 30 3 may be single-layer plates made of a single transparent material, or may have a multilayer structure in which layers made of different transparent materials are laminated. A multilayer board may be sufficient.
  • the first to third light diffusion plates 30 1 to 30 3 are multilayer plates, one or both sides of the first to third light diffusion plates 30 1 to 30 3 are usually 10 ⁇ m to 200 ⁇ m, preferably 20 ⁇ m to It is preferable to use a structure in which a skin layer having a thickness of 100 ⁇ m is formed, and a transparent resin material constituting the skin layer to which an ultraviolet absorber is added is used.
  • the first to third light diffusion plates 30 1 to 30 3 By adopting such a configuration, it is possible to prevent the first to third light diffusion plates 30 1 to 30 3 from being deteriorated by the point light source 22 and ultraviolet rays that may be included in light from the outside.
  • a light source 22 having a relatively large proportion of ultraviolet rays it is preferable to form a skin layer on the lower surfaces 31 1 to 31 3 , since deterioration due to ultraviolet rays can be prevented.
  • the upper surface 32 1 that the ⁇ 32 3 not formed skin layer is further preferred in terms of cost.
  • the content thereof is usually 0.5% by mass to 5% by mass, preferably 1% by mass to 2%, based on the transparent resin material. 0.5% by mass.
  • the surface on the point light source 22 side can be a surface having light diffusibility in order to reduce moire.
  • the surface on the point light source 22 side may be configured as described above with a skin layer containing fine particles called a matting agent, or the surface on the point light source 22 side may be embossed or blasted.
  • the mat layer may be formed by applying a coating solution containing a matting agent and a binder.
  • the first to third light diffusion plates 30 1 to 30 3 may be coated with an antistatic agent on one side or both sides.
  • an antistatic agent By applying an antistatic agent, dust adhesion due to static electricity can be prevented, and a decrease in light transmittance due to dust adhesion can be prevented.
  • the first to third light diffusion plates 30 1 to 30 3 are made of a transparent material.
  • the refractive index of the transparent material is usually 1.46 to 1.62.
  • transparent materials include transparent resin materials and transparent glass materials.
  • transparent resin materials include polycarbonate resin (refractive index: 1.59), MS resin (methyl methacrylate-styrene copolymer resin) (refractive index: 1.56 to 1.59), polystyrene resin (refractive index: 1.59), AS resin (acrylonitrile-styrene copolymer resin) (refractive index: 1.56 to 1.59), acrylic ultraviolet curable resin ( A refractive index of 1.46 to 1.58) is exemplified, and a polystyrene resin is preferable in terms of cost and low moisture absorption.
  • additives such as an ultraviolet absorber, an antistatic agent, an antioxidant, a processing stabilizer, a flame retardant, and a lubricant can be added to the transparent resin material. These additives can be used alone or in combination of two or more.
  • UV absorbers examples include benzotriazole UV absorbers, benzophenone meter UV absorbers, cyanoacrylate UV absorbers, malonic ester UV absorbers, oxalic anilide UV absorbers, and triazine UV absorbers. Preferred are benzotriazole ultraviolet absorbers and triazine ultraviolet absorbers.
  • the transparent resin material is usually used without adding a light diffusing agent as an additive, but may be added with a light diffusing agent as long as it is a slight amount that does not impair the object of the present invention.
  • a powder having a refractive index different from that of the above-described transparent material mainly constituting the first to third light diffusing plates 30 1 to 30 3 is usually used and dispersed in the transparent material.
  • the light diffusing agent for example, organic particles such as styrene resin particles and methacrylic resin particles, inorganic particles such as potassium carbonate particles, silica particles, and silicone resin particles are used, and the particle diameter is usually 0.8 ⁇ m to 50 ⁇ m. .
  • the first to third light diffusion plates 30 1 to 30 3 can be manufactured by, for example, a method of cutting out from a transparent material. Moreover, when using a transparent resin material as a transparent material, it can manufacture by normal methods, such as an injection molding method, an extrusion molding method, a photopolymer method, a press molding method, for example.
  • the first to third light diffusion plates 30 1 to 30 3 are provided so as to satisfy the following conditions in the z direction and to allow light to enter from the lower surface 31 1 , 31 2 , 31 3 side.
  • third of the light diffusion plate 30 3 is located above the second light diffusion plate 30 2.
  • a third lower surface 313 of the light diffusion plate 30 3 is located in the second upper surface 32 2 side of the light control pair 30 2.
  • convex portions 33 2, 33 3 in the extending direction are substantially parallel.
  • the extending direction of the convex portion 33 1, and the extending direction of the convex portion 33 2 or convex portion 33 3 are substantially orthogonal.
  • the angle of the convex portion 33 1 of the extending direction and the convex portion 33 2 (or convex portion 33 3), 80 ° ⁇ 100 ° are exemplified, and preferably, 90 °.
  • the first to third light diffusion plates 30 1 to 30 3 satisfy the arrangement conditions (i) to (iv), and the first light diffusion plate 30 1 and the second light diffusion plate It is provided in the z direction in the order of 30 2 and the third light diffusing plate 30 3.
  • the distance d 12 between the first and second light diffusing plate 30 1, 30 2, first light diffusing plate 30 1 of the convex portion 33 1 apex 33b 1 and the second light diffusion plate 30 2 a z-direction distance between the lower surface 31 2, 5 mm or less can be exemplified.
  • the second and third light diffusion plate 30 2, 30 a distance d 23 between the 3, the second top portion 33b 2 of the light diffusion plate 30 2 of the convex portion 33 2 and the third light diffusing plate The distance in the z direction between the lower surface 31 3 of 30 3 and 5 mm or less can be exemplified.
  • d 12 and d 23 are 0 mm
  • the second light diffusion plate 30 2 and the first upper convex portion 33 1 of the light diffusing plate 30 1 third light diffusing plate 30 3 the upper of the lower surface 31 2, 31 3 may be arranged in contact with the top 33b 1, 33b 2 of the lower convex portion 33 1, 33 2.
  • the thicknesses d2 and d3 of the second and third light diffusion plates 30 2 and 30 3 are set to the first light.
  • the second and third light diffusion plate 30 2 if the 30 3 was assumed thinner such film-like, the first light diffusing plate 30 1 and the second and third light diffusion plate 30 2, 30 3 It is because it can be used as a support base for.
  • Lx, Ly, and D are values in which Lx / D and Ly / D are each 2 or more, and further 2.5 or more. Is preferable in that it can be made thinner.
  • the light diffusion plate unit 21A, in the transmissive image display device 1, to the extending direction of the convex portion 33 1 may be arranged such that the longitudinal direction of the screen, arranged so as to be laterally May be.
  • the function and effect of the light diffusing plate unit 21A will be described by taking as an example the case where the surface light source device 20 including the light diffusing plate unit 21A is applied to the transmissive image display device 1, as shown in FIG. To do.
  • the X1, X2, and X3 directions are parallel to the x direction
  • the Y1, Y2, and Y3 directions are parallel to the y direction.
  • the first convex portion 33 1 of the light diffusing plate 30 because it has a cross sectional shape represented by v I (u I) satisfying the equation (7), the first light diffusing plate on the point light source 22 when placing the 30 1, the first light diffusing plate 30 1, the light output from the point light sources 22, brightness can be emitted into a uniform linear light.
  • the convex portions 33 2 and 33 3 of the second and third light diffusion plates 30 2 and 30 3 have a cross-sectional shape represented by v II (u II ) that satisfies Expression (9),
  • v II (u II ) that satisfies Expression (9)
  • the light diffusing plates 30 2 and 30 3 can emit the light output from the point light source 22 by converting it into linear light with uniform luminance.
  • the light diffuser plate unit 21A as described above, the light diffusion plate 30 1 first convertible to a substantially uniform linear light luminance light from the point light source 22, the second and third In the z direction, the extending direction of the convex portion 33 1 and the extending direction of the convex portion 33 2 (or the convex portion 33 3 ) are substantially orthogonal to each other in the set of the light diffusion plates 30 2 and 30 3.
  • the light diffusing plate unit 21A uniformly disperses the light from the plurality of point light sources 22 and is planar light, which is planar light having higher luminance uniformity in the plane orthogonal to the z direction. Can be emitted.
  • the second and third light diffusion plate 30 2, 30 3 provided in the first upper light diffusion plate 30 1 into a film-like in the configuration of the present embodiment, the second and third light diffusing plate 30 2 and 30 3 can be the same film.
  • the configuration of the light diffusing plate unit 21A shown in FIG. 5 is a configuration that contributes to a reduction in manufacturing cost.
  • the surface light source device 20 includes the light diffusing plate unit 21A, the surface light that uniformly disperses the light from the plurality of point light sources 22 and has higher luminance uniformity on the surface orthogonal to the z direction. Can be emitted.
  • the transmissive image display device 1 includes the light diffusing plate unit 21A, the luminance uniformity in the plane orthogonal to the z direction is higher because the light from the plurality of point light sources 22 is uniformly dispersed. It is possible to irradiate the transmissive image display unit 10 with planar light. As a result, a higher quality image can be displayed.
  • the first to third light diffusion plates 30 1 to 30 3 are provided in order in the z direction.
  • the first to third light diffusion plates 30 1 to 30 3 are arranged according to the arrangement conditions. It may be provided in the z direction so as to satisfy (i) to (iv).
  • Other embodiments of the light diffusing plate unit according to the modified example of the arrangement of the first to third light diffusing plates 30 1 to 30 3 will be described as second and third embodiments.
  • FIG. 10 is a perspective view showing a second embodiment of the light diffusing plate unit (light control plate unit) according to the present invention.
  • the light diffusing plate unit 21B includes first to third light diffusing plates 30 1 , 30 2 , 30 3 as in the case of the first embodiment.
  • the light diffusion plate unit 21B is different from the light diffusion plate unit 21A in the order of arrangement of the first to third light diffusion plates 30 1 to 30 3 . This difference will be mainly described.
  • the first light diffusing plate 30 1 is to be located most point light source 22 side in the light diffuser plate unit A, the first lower surface 31 1 and the point of the light diffusion plate 30 1
  • the distance from the light source 22 was defined as D.
  • the second light diffusion plate 30 2 is located at the most point light source 22 side. Therefore, the distance D in the description of the first embodiment, in this embodiment, the distance between the second light diffusion plate 30 2 of the lower surface 31 2 and the point light sources 22.
  • the optical diffusing plate unit 21B it is substantially parallel to the extending direction of the convex portion 33 2 of the extending direction and the convex portion 33 3. Moreover, it is substantially perpendicular to the extending direction of the convex portion 33 1 of the extending direction and the convex portion 33 2 (or convex portion 33 3). Angle between the convex portion 33 1 of the extending direction and the convex portion 33 2 (or convex portion 33 3), 80 ° ⁇ 100 ° are exemplified, and preferably, 90 °.
  • the first to third light diffusion plates 30 1 to 30 3 satisfy the arrangement conditions (i) to (iv) described in the first embodiment.
  • the second and the first distance d 21 between the light diffusion plate 30 2, 30 1, second and top 33b 2 of the light diffusion plate 30 and second convex portions 33 2 first light diffusing plate 30 1 a z-direction distance between the lower surface 31 1, 5 mm or less can be exemplified.
  • the distance d 13 between the first and third light diffuser 30 1, 30 3, the first top 33b 1 of the light diffusing plate 30 1 of the convex portion 33 1 and the third light diffusing plate The distance in the z direction between the lower surface 31 3 of 30 3 and 5 mm or less can be exemplified.
  • d 21 and d 13 are 0 mm, the first light diffusing plate 30 1 and the second light diffusion plate 30 2 on the convex portion 33 2 a third light diffusing plate 30 3, the upper bottom surface 31 1, 31 3 that may be disposed in contact with the top 33b 2, 33b 1 of the lower convex portion 33 2, 33 1 first
  • the second light diffusion plate 30 2 of the first and third light diffuser 30 1, 30 3 positioned closest to the point light source 22 side of the first to third light diffusing plate 30 1-30 3 It is preferable to make it thicker.
  • the first and third light diffusing plates 30 1 and 30 3 can be formed into a film as in the case of the first embodiment.
  • the light diffusing plate unit 21B shown in FIG. 10 can be applied to the surface light source device 20 and the transmissive image display device 1 instead of the light diffusing plate unit 21A in FIG.
  • the transmission type image display device 1 the light diffusing plate unit 21B is to the extending direction of the convex portion 33 1 may be arranged such that the longitudinal direction of the screen, arranged to be laterally May be.
  • the second and third light diffusion plates 30 2 and 30 3 are provided so as to satisfy the arrangement conditions (i) to (iii).
  • the second and third light diffusing plates 30 2 and 30 3 can convert light from the point light source 22 into linear light having substantially uniform luminance.
  • the first light diffusing plate 30 1 that can convert the light from the point light source 22 into light having uniform luminance between the second and third light diffusing plates 30 2 and 30 3. Is provided to satisfy the arrangement condition (iv).
  • the light diffusing plate unit 21B when used in place of the light diffusing plate unit 21A of FIG. 1, the light from the plurality of point light sources 22 is the light diffusing plate unit as in the first embodiment.
  • the light diffusing plate unit 21B By passing through 21B, it is possible to generate planar light that is uniformly dispersed and, as a result, has a higher luminance uniformity in a plane orthogonal to the z direction.
  • the surface light source device 20 and the transmissive image display device 1 including the light diffusing plate unit 21B and the plurality of point light sources 22 also have the same operational effects as in the case of the first embodiment.
  • the first to third light diffusing plates 30 1 to 30 3 are arranged so that the extending directions of the convex portions 33 1 , 33 2 , and 33 3 are alternately substantially orthogonal in the z direction. Is arranged. Therefore, Moire fringes is unlikely to occur in the third planar light emitted from the light diffusion plate 30 3. Therefore, even in the surface light source device 10 including the light diffusing plate unit 21 ⁇ / b> B and the plurality of point light sources 22, planar light with suppressed moire fringes can be emitted. Further, the transmissive image marking apparatus 1 including the light diffusing plate unit 21 ⁇ / b> B and the plurality of point light sources 22 can display a higher quality image.
  • FIG. 11 is a perspective view showing a third embodiment of a light diffusion plate unit (light control plate unit) according to the present invention.
  • the light diffusing plate unit 21C has first to third light diffusing plates 30 1 , 30 2 , 30 3 as in the case of the first embodiment.
  • the light diffusing plate unit 21C is different from the light diffusing plate unit 21A in the order of arrangement of the first to third light diffusing plates 30 1 to 30 3 . This difference will be mainly described.
  • the second light diffusing plate 30 2 , the third light diffusing plate 30 3, and the first light diffusing plate 30 1 are arranged in the order described in the first embodiment. It satisfies (iv) and is provided in the z direction. Also in this embodiment, as in the second embodiment, the distance D in the first embodiment, the lower surface 312 of the second light diffusion plate 30 2, between the point light sources 22 Distance.
  • the third and the first distance d 31 between the light diffusion plate 30 3, 30 1, and the third top 33b 3 of the convex portion 33 3 of the light diffusion plate 30 3 of the first light diffusing plate 30 1 a z-direction distance between the lower surface 31 1, 5 mm or less can be exemplified. Since the distance d 23 between the second and third light diffusion plates 30 2 and 30 3 is the same as that in the first embodiment, the description thereof is omitted.
  • the third light diffusing plate 30 3 and the second light diffusion plate 30 2 on the convex portion 33 2 the first light diffusion plate 30 1, the upper bottom surface 31 3, 31 1 may be disposed in contact with the top 33b 2, 33b 3 of the lower convex portion 33 2, 33 3, the This is the same as in the first embodiment.
  • the second light diffusion plate 30 2 located closest to the point light source 22 among the first to third light diffusion plates 30 1 to 30 3 is replaced with the third and first light diffusion plates 30 3 and 30 1. it is preferred to thicker, in which case, for example, the third and the first light diffusing plate 30 3, also a 30 1 may be a film-like is the same as in the first embodiment.
  • the light diffusing plate unit 21C shown in FIG. 11 can be applied to the surface light source device 20 and the transmissive image display device 1 in place of the light diffusing plate unit 21A in FIG.
  • the transmission type image display device 1 the light diffusing plate unit 21C is to the extending direction of the convex portion 33 1 may be arranged such that the longitudinal direction of the screen, arranged to be laterally May be.
  • the second and third light diffusion plates 30 2 and 30 3 are provided so as to satisfy the arrangement conditions (i) to (iii).
  • the second and third light diffusing plates 30 2 and 30 3 can convert light from the point light source 22 into linear light having substantially uniform luminance.
  • the light diffuser plate unit 21C, the first light diffusing plate 30 1 is on the third light diffusing plate 30 3, are arranged satisfies the arrangement conditions (iv). That is, the extending direction of the convex portion 33 1 of the extending direction and the convex portion 33 2 (or convex portion 33 3) are arranged so as to be substantially orthogonal.
  • the light diffusing plate unit 21C is used instead of the light diffusing plate unit 21A of FIG. 1, the light from the plurality of point light sources 22 is the light diffusing plate unit as in the case of the first embodiment.
  • 21C it is possible to generate planar light that is uniformly dispersed and, as a result, has a higher luminance uniformity in a plane orthogonal to the z direction.
  • the surface light source device 20 and the transmissive image display device 1 including the light diffusing plate unit 21C and the plurality of point light sources 22 also exhibit the same operational effects as in the case of the first embodiment.
  • FIGS. 2 and 3 the arrangement examples of the plurality of point light sources 22 are shown in FIGS. 2 and 3.
  • a square lattice that is, between the point light sources 22 adjacent to each other in the x direction and the y direction as described above.
  • the interval may be the same.
  • the end 33a 1 in the cross-sectional shape of the adjacent convex portion 33 1 has been described as overlapping in the arrangement direction of the convex portion 33a 1 , it is slightly flat between the ends 33a 1 of the adjacent convex portions 33 1.
  • a part (for example, a part caused by a manufacturing error) may be generated.
  • the light diffusing plate units 21A to 21C may further include an optical film such as a diffusing film or a microlens film on the transmissive liquid crystal display unit 10 side (for example, the liquid crystal panel side).
  • the transmissive image display device 1 may further include an optical film such as the above-described diffusion film or microlens film between the light diffusing plate units 21A to 21C and the transmissive liquid crystal display unit 10. it can.
  • the surface light source device 20 and the transmissive image display device 1 may include a reflection means such as a reflection plate that reflects the light output from the point light source 22 toward the light diffusion plate units 21A to 21C.
  • the reflecting means may be provided on the side opposite to the light diffusing plate units 21A to 21C with respect to the point light source 22, for example, a holding member for holding the point light source 22
  • the light source mounting surface can be a reflecting surface.
  • k Ia in the formula (8) was a constant satisfying 0.25 -1.00 or more.
  • h IIa in the expression (10) is 0.32w IIa or more and 0. 97w IIa or less, and k IIa is a constant satisfying ⁇ 1.00 or more and 0.75 or less.
  • the convex portion 33 1 having a first light diffusion plate 30 1, or k Ia are constants satisfying the ranges excluding -1.00 or -0.15 range from the range of k Ia
  • h IIa is 0.32 w IIa or more from the above range of h IIa . It is a constant that satisfies the range excluding the range of 80 w IIa or less, or k IIa can be a constant that satisfies the range excluding ⁇ 1.00 and 0.23 from the above range of k IIa. .
  • the first to third light diffusing plate 30 1-30 3 includes a first light diffusion plate 30 first, second and third light diffusion plate 30 2, 30 3, respectively in combination form a plurality of points to the light output from the light source more uniformly dispersed to produce a linear light
  • the convex portion 33 1, the convex portion 33 2 and the convex portion 33 3 are shaped respectively to the exit side of the light
  • Any plate-like optical component may be used.
  • the light diffusing plate unit may be one in which the three optical components are arranged in the relationship described using the light diffusing plate units 21A, 21B, and 21C.
  • the thing of a film form and a sheet form is also included according to thickness.
  • the second and third light control plates 30 2 , 30 3 are formed in a film shape, a photo is formed in the shape of the convex portions 33 2 , 33 3 .
  • Polymer methods can be used.
  • an acrylic ultraviolet curable resin having a refractive index of 1.46 to 1.58 is often used as the material of the second and third light control plates 30 2 and 30 3 , and this leads to cost and yellowing of the film. From the viewpoint of preventing deterioration, it is preferable to use a low refractive index resin having a refractive index of about 1.51.
  • the light control plate other than the light control plate located closest to the point light source is in the form of a film
  • a photopolymer method can be used for shaping the convex portion.
  • an acrylic ultraviolet curable resin having a refractive index of 1.56 to 1.62 and a refractive index of 1.46 to 1.58 can be used as the material for the light control plate.
  • a low refractive index resin having a refractive index of about 1.51 is preferably used.
  • the light control plate located closest to the point light source is preferably in the form of a sheet of 1 mm to 5 mm, and the light control plates other than the light control plate located closest to the point light source are preferably in the form of a film of 1 mm or less.
  • the light from the point light source can be dispersed sufficiently uniformly.
  • first to third light Diffusion plate 33a 1 ... end of convex portion (end of convex portion of first light control plate), 31 1 to 31 3 ... bottom surface of first to third light diffusion plates (first to third First surface of light control plate), 32 1 to 32 3 ... Upper surface of first to third light diffusion plates (second surface of first to third light control plates), 33 1 to 33 3 .

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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)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
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Abstract

La présente invention concerne un dispositif de source de lumière planaire qui répartit uniformément la lumière provenant d'une source de lumière ponctuelle. Le dispositif de source de lumière planaire (10) comprend une pluralité de sources de lumière ponctuelles (22) avec des caractéristiques de répartition de la lumière prescrites et des première à troisième plaques de commande de lumière (301 - 303) disposées dans la direction de l'épaisseur des plaques. Chaque plaque de commande de lumière possède une pluralité de sections saillantes (331-333) s'étendant dans une direction. Les sections saillantes parallèles (332, 333) et la direction d'extension de la section saillante (331) sont sensiblement orthogonales les unes aux autres et la forme de profil (v(u)) dans un système de coordonnées uv, lorsqu'une ligne axiale qui passe par les deux extrémités de la section transversale orthogonale dans les directions d'extension de chaque section saillante est l'axe u, satisfait 0,95vo(u)≦v(u)≦1,05vo(u). vo(u) satisfait la formule (1). (wa est la largeur de chaque section saillante. ha est 0,40wa - 1,60wa pour la section saillante (331) et 0,32wa - 0,97wa pour les sections saillantes (332, 333). ka est -1 - 0,25 pour la section saillante (331) et -1 - 0,75 pour les sections saillantes (332, 333).)
PCT/JP2011/070876 2010-09-15 2011-09-13 Unité de plaque de commande de lumière, dispositif de source de lumière planaire, et dispositif d'affichage d'image transmissif WO2012036161A1 (fr)

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JP2010207059A JP2012063539A (ja) 2010-09-15 2010-09-15 光制御板ユニット、面光源装置及び透過型画像表示装置
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007004573A1 (fr) * 2005-07-01 2007-01-11 Dai Nippon Printing Co., Ltd. Dispositif de source lumineuse superficielle
JP2009048838A (ja) * 2007-08-17 2009-03-05 Photo Craft Co Ltd 面光源装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007004573A1 (fr) * 2005-07-01 2007-01-11 Dai Nippon Printing Co., Ltd. Dispositif de source lumineuse superficielle
JP2009048838A (ja) * 2007-08-17 2009-03-05 Photo Craft Co Ltd 面光源装置

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