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WO2009096057A1 - Dispositif optique, dispositif d'uniformisation de lumière, feuille optique, unité de rétro-éclairage et dispositif d'affichage - Google Patents

Dispositif optique, dispositif d'uniformisation de lumière, feuille optique, unité de rétro-éclairage et dispositif d'affichage Download PDF

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Publication number
WO2009096057A1
WO2009096057A1 PCT/JP2008/063831 JP2008063831W WO2009096057A1 WO 2009096057 A1 WO2009096057 A1 WO 2009096057A1 JP 2008063831 W JP2008063831 W JP 2008063831W WO 2009096057 A1 WO2009096057 A1 WO 2009096057A1
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WO
WIPO (PCT)
Prior art keywords
light
optical
lens
propagation layer
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2008/063831
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English (en)
Japanese (ja)
Inventor
Tomohiro Nakagome
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toppan Inc
Original Assignee
Toppan Printing Co Ltd
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Filing date
Publication date
Application filed by Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Priority to JP2009551391A priority Critical patent/JP5375618B2/ja
Publication of WO2009096057A1 publication Critical patent/WO2009096057A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/54—Arrangements for reducing warping-twist

Definitions

  • the present invention particularly relates to an optical device, a light uniform device, an optical sheet, a backlight unit, and a display device used for illumination light path control in an image display apparatus typified by a flat panel display.
  • a direct type backlight having a plurality of cold cathode tubes and LEDs (Light Emitting Diodes) is employed.
  • a resin plate having a high light scattering property is used between the image display element and the light source, so that a cold cathode tube, an LED, or the like as the light source is not visually recognized.
  • the above diffusion plate diffuses light incident from the light source in all directions due to the light diffusion effect.
  • the thickness of the diffusion plate usually requires a thickness of about 1 to 5 mm in order to increase the light scattering property and to support the optical film formed on the diffusion plate. Therefore, the screen display of the liquid crystal becomes dark due to light scattering and light absorption by the diffusion plate.
  • the diffusion plate used in the direct type backlight is diffused as described above for the purpose of diffusing the light emitted from the cold cathode tube, which is the light source, and reducing luminance unevenness (lamp image). Yes.
  • the diffusion plate used in the direct type backlight is diffused as described above for the purpose of diffusing the light emitted from the cold cathode tube, which is the light source, and reducing luminance unevenness (lamp image). Yes.
  • the total light transmittance is excessively lowered, causing a decrease in luminance. Further, if the diffusion particles of the diffusion plate are reduced so as not to reduce the total light transmittance, the diffusion effect is also lowered.
  • Patent Documents 1 to 3 disclose examples in which a lens shape is formed on the exit surface of a diffusion plate as means for improving diffusion performance.
  • a lens having a convex curved surface is disposed on the diffusion plate.
  • the total light transmittance of the diffuser plate may be lowered, and the liquid crystal display screen may be darkened.
  • moire interference fringes may be generated from the lens sheet and the liquid crystal pixels arranged on the diffusion plate.
  • FIG. 22 is a schematic cross-sectional view showing an example of the BEF arrangement
  • FIG. 23 is a perspective view of the BEF.
  • the BEF 185 is an optical film in which unit prisms 187 having a triangular cross section are periodically arranged in one direction on a member 186.
  • the unit prism 187 has a size (pitch) larger than the wavelength of light.
  • the BEF 185 collects light from “off-axis” and redirects this light “on-axis” or “recycle” toward the viewer. can do. That is, the BEF 185 can increase the on-axis luminance by reducing the off-axis luminance when the display is used (observation).
  • “on the axis” means a direction that coincides with the viewing direction F ′ of the viewer, and is generally on the normal direction side with respect to the display screen.
  • the BEF 185 when used, the light component due to the reflection / refraction action may be unnecessarily emitted in the lateral direction without proceeding to the viewer's visual direction F ′.
  • the line B in FIG. 24 shows the characteristics of the BEF 185.
  • the light intensity is highest at an angle of 0 ° (corresponding to the axial direction) with respect to the light intensity and the viewing direction F ′, but the angle with respect to F ′ is ⁇ 90. Near the angle, a small light intensity peak (side lobe) is generated, and the amount of light emitted from the lateral direction is increased.
  • a diffusion film (hereinafter referred to as a lower diffusion film) in which a diffusion filler is applied on a transparent substrate and has both diffusion and condensing functions is used as a diffusion plate and a lens sheet.
  • the diffused light emitted from the diffuser plate can be collected efficiently, and the lamp image that cannot be erased only by the diffuser plate can be suppressed.
  • Patent Document 4 as a means for solving such a problem, an optical film from only the unit prism is not used, but an array structure in which unit lenses are arranged at a constant pitch in a two-dimensional direction. A backlight unit using an optical film is disclosed. The optical properties of this optical film are shown by line A in FIG. 24, no side lobe is shown, and the light intensity in the viewing direction F ′ is also improved over line B.
  • the present invention adopts the following configuration. That is, the invention of claim 1 is an optical device having a light deflection element and a light propagation layer disposed on the light emission surface side of the light deflection element, wherein the light deflection element is at least one kind or more.
  • An optical deflection lens having a concavo-convex shape, wherein the optical deflection lens has a deflection surface in two dimensions.
  • the light deflection lens is composed of unit lenses arranged two-dimensionally.
  • the invention according to claim 3 is the optical device according to claim 1, wherein the light deflection lens includes a first lens array arranged one-dimensionally and a second lens array arranged one-dimensionally, The first lens array and the second lens array are arranged so as to intersect each other.
  • the farthest intersection point of each of the light deflection lenses is included in the light propagation layer.
  • the invention of claim 5 is the optical device according to claim 1, wherein the light propagation layer is composed of at least one layer.
  • the light deflection lens includes a first apex having an arcuate surface or a ridgeline, and an opposite side from the first apex to the observer side of the light propagation layer.
  • the invention according to claim 7 is an optical uniform device comprising the optical device according to claim 1 and a light diffusion base material on the light emitting surface side of the light propagation layer of the optical device.
  • the invention of claim 8 is a light uniform device for controlling an illumination optical path, the light uniform device comprising a diffusion base material, a light propagation layer, and a light deflecting element, on the side opposite to the observer of the diffusion base material.
  • the surface on the observer side of the light propagation layer is formed on the surface, the light deflection element is formed on the surface of the light propagation layer opposite to the observer side, and the diffusion base material is
  • the light diffusion region is dispersed in a transparent resin, the total light transmittance is 30% to 80%, and the haze value is 95% or more.
  • the propagation layer has a total light transmittance of 80% or more and a haze value of 95.
  • % Uniform optical device characterized in that it is not more than%.
  • the invention of claim 9 is an optical sheet for controlling an illumination optical path of a display, wherein the optical sheet comprises the light uniform device according to any one of claims 7 to 8 and an optical film.
  • the surface on the viewer side of the uniform device is formed by overlapping the surface on the opposite side of the viewer of the optical film, and the optical film is composed of a light transmissive substrate and a condenser lens, and the light transmissive group
  • a plurality of condensing lenses are arranged at a constant pitch on the surface of the observer side of the material, the shape of the condensing lens is a convex curved surface shape, and a third top portion having an arcuate surface, and the third top portion A third inclined surface that reaches the light-transmitting substrate, and is formed such that the distance between the opposed third inclined surfaces gradually decreases as going to the third top portion.
  • a plurality of light masks and a light transmission opening for separating the light masks are provided between the optical film and the light uniform device.
  • the light transmission opening is provided corresponding to the third top of the condenser lens, and the optical film and the light uniform device are integrally laminated through the optical mask.
  • the invention according to claim 11 is the optical sheet according to claim 9, wherein dot-like or linear ribs are arranged between the optical film and the light uniform device, and the optical film and the The optical uniform device is integrally laminated.
  • the invention of claim 12 is a backlight unit comprising the optical device according to any one of claims 1 to 6, at least one optical member, and a light source.
  • a thirteenth aspect of the present invention is a backlight unit comprising the light uniform device according to any one of the seventh to eighth aspects and a light source.
  • the invention of claim 14 is a backlight unit comprising the optical sheet according to any one of claims 9 to 11 and a light source.
  • the invention of claim 15 is the backlight unit according to any one of claims 12 to 14, wherein the light source is a point light source.
  • the invention of claim 16 is characterized by comprising an image display element that transmits / shields light in pixel units and displays an image, and the backlight unit according to any one of claims 12 to 15. Display device.
  • the above-described invention it is possible to emit uniform light even when the distance to the light source is close, and by changing the thickness and material of each layer in a multilayer structure, it is possible to prevent warping due to heat emitted from the light source.
  • the optical film that improves the luminance on the viewer side by efficiently emitting the light emitted from the optical device and the light uniform device to the viewer side, and the optical device and the light uniform device are integrated.
  • a laminated optical sheet, a backlight unit including the optical sheet, and a display device can be provided.
  • FIG. 1 is a schematic cross-sectional view illustrating an example of an optical device, a light uniform device, a backlight unit, and a display device of the present invention.
  • the display device 70 according to the embodiment of the present invention includes an image display element 35 and a backlight unit 55.
  • a plurality of light sources 41 are arranged in a lamp house (reflecting plate) 43, and the light according to the embodiment of the present invention is formed thereon (observer side direction F).
  • the device, the light uniform device 25, and the optical member 2 are configured to be single or plural.
  • the light H emitted from the light source 41 is diffused by the light uniform device 25, diffused / reflected / condensed / color-shifted by one or a plurality of optical members disposed thereon, and emitted from the backlight unit 55.
  • the incident light K enters the image display element 35 and is emitted to the observer side F.
  • the light source 41 supplies light to the image display element 35. Therefore, as the light source 41, for example, a plurality of line light sources or point light sources can be used. As the plurality of line light sources, fluorescent tubes typified by CCFL can be used, and as the plurality of point light sources, for example, LEDs can be used.
  • the optical device 24 includes a light deflection element 28 and a light propagation layer 23.
  • the light deflection element 28 is arranged toward the light source 41 side of the display device 70.
  • the function of the optical device 24 is to deflect the light H incident from the incident surface of the light deflecting element 28, emit it to the light propagation layer 23, and emit diffused light from the light emission surface of the light propagation layer 23.
  • the light uniform device 25 has the diffusion base material 26 in the optical device 24 described above, and the surface 26a opposite to the observer side F of the diffusion base material 26 is on the viewer side F of the light propagation layer 23.
  • the surface 23b is formed to overlap.
  • the optical device 24 and the light uniform device 25 as described above are not limited to liquid crystal devices, but may be any devices that perform optical path control, such as rear projection screens, solar cells, organic or inorganic EL, and lighting devices. Can also be used.
  • FIG. 2A is a diagram illustrating the function of the light uniform device 25 according to the embodiment of the present invention.
  • the light sources 41 are arranged in a lamp house (reflecting plate) 43 at a constant pitch.
  • the light H emitted from the light source 41 is incident on the surface opposite to the viewer side F of the light uniform device 25, that is, the light deflection element 28, and the surface on the viewer side F of the light uniform device 25, that is, the diffusion base material 26. From the surface 26b on the observer side F to the observer side F.
  • the surface 26b on the viewer side F of the diffusion base material 26 has a bright area facing the light source 41 and a dark area facing the light source 41.
  • the light deflection elements 28 are arranged on the surface opposite to the observer side F.
  • the strong front light H incident from the light source 41 is deflected in the light deflection element 28 in the traveling direction, the incident light deflected in the light propagation layer 23 is spread, diffused in the diffusion base material 26, and uniform light is observed. It injects to person side F.
  • the angle formed by the surface 23a is ⁇
  • the pitch of each unit lens of the light deflection element 28 is P
  • the thickness of the light propagation layer 23 is T
  • the refractive index of the light propagation layer 23 is n
  • the pitch P of each unit lens of the light deflection element 28 is defined as a distance between two points joined to the light propagation layer 23 when the light deflection element 28 is viewed in cross section.
  • the pitch P of the light deflection elements 28 in which the numerical formula 1 is effective is 10 ⁇ m or more and 600 ⁇ m or less. This is because when the pitch P of the light deflection elements 28 is smaller than 10 ⁇ m, the unit lens period approaches the wavelength, and the influence of diffraction cannot be ignored.
  • the thickness T of the light propagation layer 23 becomes very thick. In this case, it is desirable to set the thickness of the light propagation layer 23 to be 2 mm or less. Therefore, the front light H incident on the light deflecting elements 28 arranged at a constant pitch is deflected by the light deflecting elements 28, and the light deflected by the adjacent light deflecting elements 28 is mixed in the light propagation layer 23 and diffused. It diffuses at the base material 26 and is ejected to the observer side F. When the thickness T of the light propagation layer 23 does not satisfy Expression 1, the light deflected by the adjacent light deflection elements 28 enters the diffusion base material 26 without intersecting, and thus the light uniform device 25 has insufficient diffusion performance. To do.
  • the light deflected by the two adjacent light deflection elements 28 intersect in the light propagation layer 23. That is, it is desirable to satisfy the following formula 2. As shown in FIG. 2C, if the light deflected by the two adjacent light deflecting elements 28 has a thickness T at which the light is mixed in the light propagation layer 23, the diffusion performance is further increased. The lamp image can be reduced / disappeared even when the distance to is short.
  • the light deflection element 28 When a microlens is used as the light deflection element 28, it is difficult to cover the entire surface 23a opposite to the observer side F of the light propagation layer 23 with the microlens.
  • the area of the surface 23a opposite to the observer side F of the light propagation layer 23 is S and the sum of the bottom areas of the arranged microlenses is M, it is desirable that M / S ⁇ 70%. This is because if M / S is less than 70%, the light incident on the light propagation layer 23 without passing through the light deflection element 28 increases, and it is difficult to erase the light source image.
  • the light cover layer 23c can be formed on a flat surface on which the microlens is not formed on the surface 23a opposite to the observer side F of the light propagation layer 23.
  • the light source image can be effectively erased by reflecting or diffusing the light H incident on the flat surface.
  • a convexly curved lens shape as shown in FIG. This is because the tangent line at each point of the first apex portions 281a and 282a and the first inclined surfaces 281b and 282b is continuously changing, so that the incident light H from the front can be deflected to various angles.
  • the convex curved lens shape is more preferably an aspherical shape as shown in FIG. This is because the radius of curvature of the first top portions 281a and 282a can be reduced, and the diffusion performance is increased.
  • the first lens array 281 and the second lens array 282 are preferably curved triangular prisms as shown in FIG. Since the first apex portions 281a and 282a are ridge lines, the incident light H can be surely largely deflected regardless of the position of the lens. Moreover, since the tangent line at each point of the first inclined surfaces 281b and 282b continuously changes, the incident light H from the front surface can be diffused to various angles. At this time, as shown in FIG.
  • the angle ⁇ b formed by the tangent line at each point of the first inclined surfaces 281b and 282b with the surface 23b opposite to the observer side F of the light propagation layer 23 is 20 It is even more desirable that it continuously varies between degrees and 90 degrees. If there is a surface below 20 degrees, the deflection angle becomes very small, and the diffusion performance becomes weak. In particular, when there is a surface at 0 degree, the incident light H is transmitted without being deflected at all.
  • the curved triangular prism has no surface where the angle formed by the tangent line at each point of the first inclined surfaces 281b and 282b and the surface 23b opposite to the observer side F of the light propagation layer 23 is smaller than 20 degrees. The light can be deflected at a large angle regardless of where the light enters the inclined surfaces 281b and 282b.
  • the angle between the tangent line at each point of the first inclined surfaces 281b and 282b and the surface 23b opposite to the observer side F of the light propagation layer 23 does not change greatly, which of the first inclined surfaces 281b and 282b Even if light is incident on the point, the deflection angles are almost the same, so the light is concentrated in the same region.
  • the angle ⁇ b formed by the tangent line at each point of the first inclined surfaces 281b and 282b with the surface 23b on the opposite side of the observer side F of the light propagation layer 23 varies greatly in the range of 20 degrees to 90 degrees. Therefore, the incident light H can be deflected at various angles to make the light uniform.
  • the first lens array 281 and the second lens array 282 may be a combination of a plurality of the lens shapes described above, or a concave lens shape obtained by inverting the lens shape.
  • a shape in which a triangular prism is combined on a convex curved lens may be used.
  • a shape in which two curved triangular prisms are shifted and overlapped as shown in FIG. This is because the diffusion performance is further increased by the diffusion effect of two or more lens shapes.
  • the unit lens pitch P is defined as the arrangement pitch of the first lens array.
  • the first lens array 281 and the second lens array 282 may include a light cover layer that diffuses and reflects the light H from the light source 41 on the first top portions 281a and 282a.
  • FIG. 9A is a diagram showing the light reflection effect of the light cover layers 281c and 282c.
  • the light cover layers 281c and 282c are formed on the first apexes 281a and 282a of the convex curved lens, so that the light incident on the first lens array 281 and the second lens array 282 having a small deflection angle is reflected.
  • the region with a large deflection angle can be selected, so that the diffusion performance can be improved.
  • the angle formed between the tangent line at each point of the first inclined surfaces 281b and 282b and the surface 23b opposite to the viewer side of the light propagation layer 23 is 20 degrees to 90 degrees, and each of the first apexes 281a and 282a. More preferably, the angle formed between the tangent at the point and the surface 23a opposite to the observer side F of the light propagation layer 23 is in the range of 0 to 40 degrees.
  • FIG. 9B is a diagram showing the light diffusion effect of the light cover layers 281c and 282c.
  • the light cover layers 281c and 282c are formed on the first apexes 281a and 282a of the convex curved lenses, so that the light incident on the first lens array 281 and the second lens array 282 having a small deflection angle is diffused.
  • the diffusion performance can be improved.
  • FIG. 10A shows a case where the light cover layers 281c and 282c are formed on the first apexes 281a and 282a of the convex curved lens.
  • the light cover layers 281c and 282c may be rounded in a shape along the curved first apexes 281a and 282a.
  • the first top portions 281a and 282a may be substantially flat as shown in FIG. 10B, for example.
  • the light cover layers 281c and 282c may be formed on the first top portions 281a and 282a formed in a convex shape.
  • the optical cover layers 281c and 282c may partially wrap around the first inclined surfaces 281b and 282b as shown in FIG. However, if most of the first inclined surfaces 281b and 282b are covered, the diffusion function of the first lens array 281 and the second lens array 282 is deteriorated, and therefore the amount of wraparound ⁇ is the first inclined surfaces 281b and 282b. It is desirable that it is 30% or less with respect to the width p.
  • the light cover layers 281c and 282c are formed on the first apexes 281a and 282a of the convex curved lens has been described. The case where it forms in the top parts 281a and 282a is also included.
  • the light deflection element 28 has a shape that is formed in the direction in which the second lens array 282 intersects the top of the first lens array 281. desirable.
  • the shape of the first lens array 281 and the second lens array 282 to intersect with each other is a convex lens shape as shown in FIGS. 7A to 7D and FIGS. 8A to 8B, or a concave lens.
  • the shapes can be combined.
  • the second lens array 282 may be provided with the light cover layer 282c on the top portion 282a.
  • the light deflection element 28 may have a pyramid shape as shown in FIG. 12 or a shape where the pyramid as shown in FIG. 13 is depressed by matching the heights of the first lens array 281 and the second lens array 282. desirable. This is because the same deflection effect can be easily obtained in the four directions with respect to the point light source 41.
  • first lens array and the second lens array arrange unit lenses as described above to deflect incident light two-dimensionally, it is possible to erase the light source image of the point light source.
  • the light deflection element 28 may be arranged by appropriately combining a plurality of the above-described lenses.
  • FIGS. 14A and 14B an example of a microlens is illustrated as a unit lens, but the unit lens may be arranged with a pitch P0 or a height changed.
  • the farthest intersection ⁇ of the light deflection element 28 is unevenly arranged in the light propagation layer 23.
  • FIG. 14 (c) shows that the farthest intersection point ⁇ is arranged in parallel and on a straight line with respect to the arrangement direction of the unit lenses of the light deflection element 28.
  • FIGS. 14A to 14C show an example in which the farthest intersection point ⁇ is a point where light incident on both ends of the unit lens is deflected and intersects.
  • the position of the farthest intersection ⁇ of the light incident on each light deflection element 28 exists on the same plane.
  • the optical device 24 and the light uniform device 25 can obtain the same diffusion performance in any region, the optical device 24 and the light uniform device 25 without unevenness can be provided.
  • the thickness T of the light propagation layer 23 is different for each light deflection element 28. At this time, it is desirable to select the thickness T of the light propagation layer 23 that is the thickest among the lenses to be combined.
  • T that is the thickest
  • all the light deflection elements 28 arranged can satisfy the above-described Expressions 1 and 2, and thus a diffusion effect can be obtained with certainty.
  • the light deflection element It is effective to make the 28 farthest intersections ⁇ non-uniform.
  • they may be regularly arranged in accordance with the position of the light source 41 as shown in FIG.
  • the light deflection element 28 in the region directly above the light source 41 so that the thickness T of the light propagation layer 23 can be set to be the thinnest.
  • the diffusion performance in the region directly above the light source 41 can be improved, and thus the luminance unevenness can be further reduced.
  • the light deflecting element 28 can be formed on the surface 23a of the light propagation layer 23 opposite to the observer side F by using an electron beam curable resin such as a UV curable resin or by a soft molding method. .
  • the diffusion base material 26 and the light propagation layer 23 are integrally formed as a plate member by an extrusion method or the like, and the light deflection element 28 is formed on the surface 23a opposite to the observer side F of the light propagation layer 23.
  • the light propagation layer 23 is formed as a plate-like member by an extrusion method, an injection molding method, or the like, and before / after the light propagation layer 23 is integrated with the diffusion base material 26, on the side opposite to the observer side F of the light propagation layer 23.
  • the light deflection element 28 can be formed on the surface 23a.
  • the light deflection element 28 can also be formed by a press molding method. Further, the light deflection element 28 can be formed on the surface of the sheet material produced in the same manner using a radiation curable resin.
  • the fixed layer 20 is formed using a pressure-sensitive adhesive or an adhesive.
  • Urethane, acrylic, rubber, silicone, and vinyl resins can be used for the pressure-sensitive adhesive and adhesive.
  • the pressure-sensitive adhesive and the adhesive those which are pressed and adhered in a one-pack type, those which are cured by heat or light can be used, and those which are cured by mixing two liquids or a plurality of liquids are used. be able to.
  • a filler may be dispersed in the fixed layer 20. By dispersing the filler in the fixed layer 20, the elastic modulus of the bonding layer can be increased.
  • the fixed layer 20 As a method for forming the fixed layer 20, there are a method of directly applying to the bonding surface and a method of pasting together those prepared in advance as a dry film. It is preferable to prepare the fixed layer 20 as a dry film because it can be easily handled in the manufacturing process.
  • the fixed layer 20 has a warping preventing action.
  • the thermal linear expansion coefficient of the fixed layer 20 so as to be substantially the same as the thermal linear expansion coefficient of the diffusion base material 26, it is possible to prevent the optical uniform device 25 itself from warping.
  • the warping of the light uniform device 25 itself can be prevented by matching the thermal linear expansion coefficient of the light deflection element 28 formed into a sheet shape so as to be substantially the same as the thermal linear expansion coefficient of the diffusion base material 26. it can.
  • the thickness of the light deflection element 28 formed into a sheet is preferably 10 ⁇ m to 1 mm. Further, it is desirable to be 25 ⁇ m to 500 ⁇ m.
  • the base material region of the light deflection element 28 formed into a sheet shape can be regarded as the light propagation layer 23. Therefore, by forming the light deflection element 28 in a thick sheet shape, the thickness of the light propagation layer 23 can be reduced. Further, it can be directly bonded to the diffusion base material 26.
  • the surface of the light deflection element 28 may have finer irregularities.
  • the fine unevenness can further enhance the deflection effect by the light deflection lens 28.
  • the surface roughness Ra is preferably in the range of 0.1 ⁇ m to 10 ⁇ m. If the concavo-convex structure is less than 0.1 ⁇ m, it is difficult to obtain a deflection effect, and the concavo-convex structure exceeding 10 ⁇ m itself becomes the light deflection element 28.
  • the method of roughening the surface of the light deflection element 28 or the molding die by etching or sandblasting, or the molding die of the light deflection element 28 is further refined. A method such as cutting is used.
  • the light deflection element 28 may not have the lens shape as described above as long as it deflects the incident light H.
  • the light deflection element 28 may be a diffusion layer made of a resin filler or bubbles. This is because the incident light H is deflected by the light deflection element 28, the light deflected by the light propagation layer 23 is expanded, and further diffused by the diffusion base material 26, thereby improving the diffusion performance.
  • the light propagation layer 23 constituting the light uniform device 25 of the present invention preferably has a total light transmittance of 80% or more. If the total light transmittance is 80% or more, the luminance of the light emitted to the observer side F is not lowered. Conversely, if the total light transmittance is less than 80%, the luminance of the light emitted to the observer side F is lowered, which is not preferable.
  • the total light transmittance is a measured value based on JIS K7361-1.
  • the light propagation layer 23 does not include a light diffusion element. This is because when the light diffusing element is not contained in the light propagation layer 23, the light deflected by the light deflecting element 28 can be effectively spread and propagated.
  • the light propagation layer 23 can have a multilayer structure of at least two layers. At this time, when the refractive index of the layer 23A on the light deflection element 28 side is n1, the refractive index of the layer 23B on the diffusion base material 26 side is n2, and the refractive index of the light deflection element 28 is n0, Expression 3 is satisfied. desirable.
  • Equation 3 will be described with reference to FIG.
  • the light H enters the light deflection element 28, the light H is deflected by the refractive index of air and the refractive index n0 of the light deflection lens 28.
  • FIG. 17A light is emitted from the light deflection element 28, the layer 23A of the light propagation layer 23 on the light deflection element 28 side, and the layer 23B of the light propagation layer 23 on the diffusion base material 26 side.
  • a case where the refractive index at the interface is increased is indicated by a two-dot chain line
  • a case where the refractive index is not changed is indicated by a dotted line
  • a case where the refractive index is reduced is indicated by a solid line.
  • n0 ⁇ n1 that is, when the refractive index becomes high, it is deflected in the direction shown by the two-dot chain line. Since the angle formed between the deflected light and the surface 23a opposite to the observer side F of the light propagation layer 23 is increased, the diffusion performance is deteriorated. Similarly, at the interface between the layer 23A on the light deflection element 28 side of the light propagation layer 23 and the layer 23B on the diffusion base material 26 side of the light propagation layer 23, if n1> n2, that is, the refractive index is low, the diffusion performance Will be improved.
  • the refractive index n0 of the light deflection element 28 and the refractive index n1 of the layer 23A on the light deflection element 28 side of the light propagation layer 23 are equal to each other or the refractive index n0 of the light deflection element 28 is larger.
  • the refractive index n1 of the layer 23A on the light deflection element 28 side of the light propagation layer 23 and the refractive index n2 of the layer 23B on the diffusion base material 26 side of the light propagation layer 23 are equal or the light deflection element 28 of the light propagation layer 23. It is desirable that the refractive index n1 of the side layer 23A is larger.
  • the thickness of the layer 23B on the diffusion base material 26 side of the light propagation layer 23 is thicker than the thickness of the layer 23A on the light deflection element 28 side of the light propagation layer 23. This is because the light can be greatly expanded in the layer 23B of the light propagation layer 23 on the diffusion base material 26 side. Furthermore, as shown in FIG. 17B, the point where the light incident on both ends of the unit lens of the light deflection element 28 is deflected and intersects is located on the layer 23A of the light propagation layer 23 on the light deflection element 28 side. It is desirable to do.
  • the farthest intersection ⁇ of the light deflection element 28 is the light exit surface of the light deflection element 28 (that is, the observer side F of the light propagation layer 23 and It may be contained in a layer in contact with the opposite surface 23a).
  • the farthest intersection point is at a point close to the light deflection element 28 in the light propagation layer 23, light can be diffused greatly.
  • the light propagation layer 23 described above can be formed by a plurality of layers having different refractive indexes by a multilayer extrusion method or the like. Further, the light deflection element 28 is formed into a sheet shape using a material having a refractive index higher than that of the light propagation layer 23 on the light propagation layer 23 formed by an extrusion method or an injection molding method, and is bonded by a lamination method or the like. Can also be realized.
  • the light propagation layer 23 can be prevented from warping by having a multilayer structure.
  • warpage of the optical device 24 and the optical uniform device 25 is prevented by matching the thermal linear expansion coefficient of the layer farthest from the viewer side with the thermal linear expansion coefficient of the diffusion base material 26 to approximately the same extent. Can do.
  • the warp of the optical device 24 and the optical uniform device 25 can be prevented also by adjusting the thickness of the light propagation layer 23.
  • the diffusion base material 26 preferably has a haze value of 95% or more. When the haze value is less than 95%, the diffusion performance is insufficient, and the uniformity of in-plane luminance is deteriorated.
  • the light diffusion region is preferably made of light diffusion particles. This is because suitable diffusion performance can be easily obtained.
  • transparent particles made of an inorganic oxide or a resin can be used.
  • transparent particles made of an inorganic oxide for example, silica, alumina or the like can be used.
  • the transparent particles made of resin include acrylic particles, styrene particles, styrene acrylic particles and cross-linked products thereof, melamine / formalin condensate particles, PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxy resin), FEP (tetrafluoroethylene).
  • Fluoropolymer particles such as fluoroethylene / hexafluoropropylene copolymer), PVDF (polyfluorovinylidene), and ETFE (ethylene / tetrafluoroethylene copolymer), silicone resin particles, and the like can be used. Moreover, you may use combining 2 or more types of transparent particles from the transparent particle mentioned above. Furthermore, the size and shape of the transparent particles are not particularly defined.
  • the thickness of the diffusing substrate 26 is preferably 0.1 to 5 mm.
  • the thickness of the diffusion base material 26 is 0.1 to 5 mm, optimal diffusion performance and brightness can be obtained.
  • the thickness is less than 0.1 mm, the diffusion performance is insufficient, and if it exceeds 5 mm, the amount of resin is large and the luminance is reduced due to absorption.
  • thermoplastic resin In the case where a thermoplastic resin is used as the transparent resin, air bubbles may be used as the light diffusion region.
  • the internal surface of the bubble formed inside the thermoplastic resin causes diffused reflection of light, and a light diffusing function equivalent to or higher than that when light diffusing particles are dispersed can be expressed. Therefore, the film thickness of the diffusion base material 26 can be made thinner.
  • Examples of such a diffusion base material 26 include white PET and white PP.
  • White PET is a resin that is incompatible with PET, fillers such as titanium oxide (TiO 2 ), barium sulfate (BaSO 4 ), and calcium carbonate are dispersed in PET, and then the PET is stretched by a biaxial stretching method. By doing so, bubbles are generated around the filler to form.
  • thermoplastic resin examples include polyethylene terephthalate (PET), polyethylene-2,6-naphthalate, polypropylene terephthalate, polybutylene terephthalate, cyclohexanedimethanol copolymer polyester resin, isophthalic acid copolymer polyester resin, and sporoglycol copolymer polyester.
  • polyester resins such as fluorene copolymer polyester resins, polyolefin resins such as polyethylene, polypropylene, polymethylpentene, and alicyclic olefin copolymer resins, acrylic resins such as polymethyl methacrylate, polycarbonate, polystyrene, polyamide, polyether , Polyesteramides, polyetheresters, polyvinyl chloride, cycloolefin polymers, and copolymers containing these as components. These mixtures of resins or the like can be used it is not particularly limited.
  • the thickness of the diffusion base material 26 is preferably 25 to 500 ⁇ m.
  • the thickness of the diffusion base material 26 is less than 25 ⁇ m, it is not preferable because the sheet is insufficiently squeezed and wrinkles are easily generated in the manufacturing process and display.
  • the thickness of the diffusion base material 26 exceeds 500 ⁇ m, there is no particular problem in optical performance, but it is difficult to process into a roll shape due to increased rigidity, and it is difficult to make a slit easily. This is not preferable because the advantage of the thinness obtained is reduced.
  • the light uniform device 25 is preferably formed by integrally forming the diffusion base material 26, the light propagation layer 23, and the light deflection element 28 by a multilayer extrusion method.
  • the light uniform device 25 may be extended in at least one axial direction.
  • the light uniform device 25 of the present invention can have a concavo-convex shape on the surface 26 b on the viewer side F of the diffusion base material 26.
  • the uneven surface is provided on the emission surface 26 b of the light uniform device 25, so that the surface 26 b on the viewer side F of the diffusion base material 26 is various compared to the case where the surface 26 b is substantially flat. Since the angled emission surface is formed, light can be emitted over a wider range, so that the diffusion performance is improved and the lamp image is reduced / disappeared.
  • the light diffusion lens 21 is mentioned as an uneven
  • the lens shape is preferably the same as that of the light deflection lens 28.
  • the diffusing lens 21 is disposed on the surface of the diffusing substrate 26, for example, when the lens sheet 2 is disposed as the optical member 2, moire interference fringes may occur between the diffusing lens 21 and the lens sheet 2. Therefore, a method in which the periodic structure of the diffusing lens 21 and the periodic structure of the lens of the lens sheet 2 are adjusted to a pitch at which moire interference fringes do not occur, an angle is provided, or a diffusing film is further applied as the optical member 2. Is mentioned. When a member having no periodic structure such as a diffusing film or a deflection separation reflection sheet is disposed as the optical member 2, the above-described problem does not occur.
  • the exit surface that is, the surface 26b on the viewer side F of the diffusion base material 26 is preferably substantially flat. The reason will be described with reference to FIG.
  • FIG. 19 is a schematic cross-sectional view illustrating an example of the optical sheet, the backlight unit, and the display device of the present invention.
  • the optical film 1 and the light uniform device 25 of the present invention are integrally laminated by the fixed layer 20.
  • the optical film 1 includes a light transmissive substrate 17 and a condenser lens 16, and a plurality of condenser lenses 16 are arranged at a constant pitch on a surface 17 b on the viewer side of the light transmissive substrate 17.
  • the condensing lens 16 By forming the condensing lens 16 on the observer-side surface 17b of the light-transmitting substrate 17, the light passing through the light uniform device 25 is condensed on the observer side F, and the luminance of the observer side F is obtained. Can be improved.
  • a surface 17 a opposite to the observer side F of the light transmitting substrate 17 is a substantially flat surface, a plurality of light masks 22 are formed, and a light uniform device 25 is bonded via the fixed layer 20.
  • a thermoplastic resin, a thermosetting resin, or the like can be used, and the material used for the light uniform device 25 may be used. By joining the materials used for the light uniform device 25, the occurrence of warpage can be suppressed.
  • the optical sheet 52 of the present invention is formed by the condensing lens 16 and the light deflection element 28. Since the diffusion base material 26 is inserted in between, moire interference fringes can be prevented. Here, since there is no diffusing element between the condenser lens 16 and the diffusing base material 26, and in order to bond the optical film 1 to the surface 26b on the viewer side F of the diffusing base material 26 without unevenness, It is desirable that the viewer-side surface 26b of the diffusion base material 26 is substantially flat.
  • the shape of the condensing lens 16 is a convex curved surface, and has a third apex portion 16a having an arcuate surface and a third inclined surface 16b extending from the third apex portion 16a to the light transmitting substrate. Moreover, the condensing lens 16 is formed so that the distance between the 3rd inclined surfaces 16b which oppose may decrease gradually as it goes to the 3rd top part 16a. Furthermore, the condenser lenses 16 are spaced apart by the valleys 13 and are formed at a constant pitch.
  • a plurality of light masks 22 and light transmission openings (air layers) 100 that separate the light masks 22 are provided between the optical film 1 and the light uniform device 25, a plurality of light masks 22 and light transmission openings (air layers) 100 that separate the light masks 22 are provided.
  • the pitch of the optical mask 22 and the air layer 15 is substantially the same as the pitch of the condenser lens 16.
  • the position of the optical mask 22 is formed at a position corresponding to the position of the valley portion 13. Therefore, the position of the air layer 100 is provided at a position corresponding to the third top portion 16 a of the condenser lens 16.
  • the optical mask 22 is made of a material having a high light shielding property and is formed at a position corresponding to the position of the valley portion 13 that separates the condenser lens 16 formed on the surface 17b on the observer side F, Most of the light incident on the optical film 1 passes through the air layer 100 formed away from the optical mask 22 and is incident on the condenser lens 16, so that the light that has passed through the light uniform device 25 can be efficiently used. The light is emitted in the front direction (observer side) F.
  • the optical mask 22 can be composed of a light reflective member such as a metal material or a white reflective material.
  • the light reflected by the light mask 22 is returned to the diffusion base material 26 constituting the light uniform device 25, and after being diffused again by the diffusion base material 26, a part of the light again enters the optical film 1.
  • a part of the light is emitted from the light uniform device 25 to the light source side, reflected by the reflector constituting the lamp house, re-enters the light uniform device, is further diffused, and re-enters the optical film 1.
  • the reflectance is desirably 80% or more. If the reflectance is 80% or more, most of the light incident on the optical film 1 can be incident on the condenser lens 16 from the air layer 100, so that the luminance on the observer side F increases. If the reflectance is less than 80%, the amount of light transmitted through the optical mask 22 increases, and the amount of inefficient light incident on the condenser lens 16 increases, thereby causing a decrease in luminance on the viewer side F. .
  • the optical sheet 52 is produced by laminating the optical film 1 produced as described above to the light uniform device 25 by the fixing layer 20 by lamination or the like. At this time, the material of the fixed layer 20 is appropriately selected so that the air layer 100 is maintained.
  • the fixed layer 20 is formed using a pressure sensitive adhesive or an adhesive.
  • Urethane, acrylic, rubber, silicone, and vinyl resins can be used for the pressure-sensitive adhesive and adhesive.
  • the pressure-sensitive adhesive and the adhesive those which are pressed and adhered in a one-pack type, those which are cured by heat or light can be used, and those which are cured by mixing two liquids or a plurality of liquids are used. be able to.
  • a filler may be dispersed in the fixed layer 20. By dispersing the filler in the fixed layer 20, the elastic modulus of the fixed layer 20 can be increased.
  • the fixed layer 20 When the elastic modulus of the fixed layer 20 is increased, when the optical film 1 and the light uniform device 25 are integrated, the fixed layer 20 does not enter the region of the air layer 100, so that the air layer 100 can be held. It becomes easy.
  • a method for forming the fixed layer 20 there are a method of directly applying to the bonding surface and a method of pasting together those prepared in advance as a dry film. It is preferable to prepare the fixed layer 20 as a dry film because it can be easily handled in the manufacturing process.
  • the condensing lens 16 By forming the condensing lens 16 on the observer-side surface 17b of the light-transmitting substrate 17, the light passing through the light uniform device 25 is condensed on the observer side F, and the luminance of the observer side F is obtained. Can be improved.
  • a plurality of ribs 29 are provided between the optical film 1 and the light uniform device 25.
  • the ribs 29 are arranged in the form of dots or lines, and ensure a sufficient air layer between the optical film 1 and the light uniform device 25. For example, by matching the valley portion 13 of the condenser lens 16 with the linear rib 29, it is possible to suppress a decrease in luminance and to prevent moiré interference fringes between the rib 29 and the condenser lens 16.
  • the rib 29 may be formed on the surface 17a opposite to the observer side of the light transmitting substrate 17 of the optical film 1, and as shown in FIG. 20B.
  • the light uniform device 25 may be formed on the viewer-side surface 26 b of the diffusion base material 26.
  • 20 shows an example in which the optical film 1 is a prism sheet.
  • the present invention is not limited to this.
  • a condensing function is provided on the observer side F such as a microlens, a convex lenticular lens, or a pyramid lens as shown in FIG. Any lens sheet can be selected.
  • the backlight unit 55 is a direct type backlight unit, and includes an optical sheet 52, a plurality of light sources 41, and a reflection plate 43. .
  • the optical sheet 52 By disposing the optical sheet 52 on the observer side F of the plurality of light sources 41, the light H from the light sources 41 can be almost taken in.
  • the light H is incident on the optical sheet 52 and is set as outgoing light K.
  • the emitted light K is emitted with the brightness of the observer side F improved by the condensing effect of the optical sheet 52 while the lamp image of the light source 41 is eliminated by the diffusion effect of the optical sheet 52.
  • the image display element 35 is preferably an element that displays an image by transmitting / blocking light in pixel units. If the image is displayed by transmitting / blocking light in pixel units, the optical sheet 52 improves the luminance toward the observer side F, reduces the viewing angle dependency of the light intensity, and further, a lamp image. It is possible to display an image with high image quality by effectively using the light with reduced image quality.
  • the image display element 35 is preferably a liquid crystal display element.
  • a liquid crystal display element is a typical element that transmits / shields light in pixel units and displays an image, and can improve image quality and reduce manufacturing cost compared to other display elements. Can do.
  • a display device 70 according to an embodiment of the present invention is an image display element 35 that defines a display image according to transmission / light-shielding in pixel units, and improves the light collection and diffusion characteristics by the backlight unit 55 described above. Therefore, the luminance on the viewer side F can be improved, the distribution of the light intensity in the viewing angle direction can be smoothed, and an image with a reduced lamp image can be obtained.
  • the image display element 35 is a liquid crystal display element, and the light K whose light collection / diffusion characteristics are improved by the backlight unit 55 described above is used. It is possible to improve the brightness of the person side F, smooth the distribution of the light intensity in the viewing angle direction, and obtain an image with a reduced lamp image.
  • the present invention will be described in detail based on examples. In addition, this invention is not limited only to these Examples.
  • the linear expansion coefficient of polycarbonate was 7 ⁇ 10 ⁇ 5 mm / mm / ° C., and the linear expansion coefficient of polypropylene was 11 ⁇ 10 ⁇ 5 mm / mm / ° C.
  • a 1 mm thick polycarbonate plate was prepared.
  • the light deflection element 28 a triangular prism was produced on a stretched polyethylene terephthalate film having a thickness of 100 ⁇ m by a UV molding method, and laminated on a polycarbonate plate having a thickness of 1 mm using an adhesive material, whereby an optical device 24 was obtained.
  • the linear expansion coefficient of polycarbonate was 7 ⁇ 10 ⁇ 5 mm / mm / ° C.
  • the linear expansion coefficient of polyethylene terephthalate was 8 ⁇ 10 ⁇ 5 mm / mm / ° C.
  • Example 1 As the light propagation layer 23, a 1 mm thick polycarbonate plate was prepared.
  • As the light deflection element 28, a triangular prism was produced on a 100 ⁇ m-thick unstretched polyethylene terephthalate film by a UV molding method, and laminated on a 1 mm-thick polycarbonate plate using an adhesive material, whereby an optical device 24 was obtained.
  • the linear expansion coefficient of polycarbonate was 7 ⁇ 10 ⁇ 5 mm / mm / ° C.
  • the linear expansion coefficient of polyethylene terephthalate was 8 ⁇ 10 ⁇ 5 mm / mm / ° C.
  • the optical device 24 produced in Comparative Examples 1 and 2 and Example 1 was left at a high temperature of 80 degrees for 24 hours, and the warping behavior of the optical device 24 was confirmed.
  • warpage occurred because the linear expansion coefficient between the polycarbonate plate and polypropylene was 1.5 times or more.
  • Comparative Example 2 the linear expansion coefficient of the polycarbonate plate and polyethylene terephthalate was almost the same, but because the polyethylene terephthalate was a stretched film, shrinkage occurred and warpage occurred.
  • a convex microlens was prepared as the light deflection element 28.
  • the pitch P of the convex microlenses is 80 ⁇ m
  • the angle ⁇ formed by the tangent m at the junction 30 between the light propagation layer 23 and the convex microlens and the surface 23a opposite to the observer side of the light propagation layer 23 is 85 degrees
  • the height of the convex microlens was set to 38 ⁇ m.
  • the diffusion base material 26 contained an appropriate amount of a resin filler so that the total light transmittance was 60%, the haze value was 99%, and the thickness was 1.5 mm.
  • the light propagation layer 23 was made of a transparent material without containing a resin filler, and the total light transmittance was 87%. In the following examples, samples in which the thickness of the light propagation layer 23 was changed were produced. (Comparative Example 3) In the light uniform device 25 set as described above, the thickness of the light propagation layer 23 was set to 50 ⁇ m, and the light uniform device 25 was produced by a multilayer extrusion method. Example 4 In the light uniform device 25 set as described above, the thickness of the light propagation layer 23 was set to 300 ⁇ m, and the light uniform device 25 was produced by a multilayer extrusion method.
  • a lens sheet having a second triangular prism array formed on the top of the first trapezoidal prism array as shown in FIG. 11A was prepared as the light deflection element 28.
  • the pitch P of the first trapezoidal prism array was 100 ⁇ m
  • the apex angle was 90 degrees
  • the pitch of the second triangular prism array was 30 ⁇ m
  • the apex angle was 90 degrees.
  • the diffusion base material 26 contained an appropriate amount of a resin filler so that the total light transmittance was 60%, the haze value was 99%, and the thickness was 1.5 mm.
  • the light propagation layer 23 was made of a transparent material without containing a resin filler, had a thickness of 500 ⁇ m, and a total light transmittance of 87%.
  • Example 6 As the light deflection element 28, a lens in which a second convex lenticular array 282 is formed in a shape substantially orthogonal between unit lenses of the first convex lenticular array 281 as shown in FIG. 6B. A sheet was prepared.
  • the pitch P of the first convex lenticular array 281 is 90 ⁇ m, the angle ⁇ formed by the tangent m at the junction 30 between the light propagation layer 23 and the convex lenticular lens, and the surface 23a opposite to the observer side of the light propagation layer 23.
  • the diffusion base material 26 contained an appropriate amount of a resin filler, whereby the total light transmittance was 80%, the haze value was 93%, and the thickness was 1.5 mm.
  • the light propagation layer 23 was made of a transparent material without containing a resin filler, had a thickness of 500 ⁇ m, and a total light transmittance of 87%.
  • a diffusion film, a 90-degree triangular prism sheet, and a diffusion film were arranged in this order on the surface on the viewer side F of the light uniform device 25 produced in Examples 4 to 6 and Comparative Examples 3 to 4. These are arranged in the backlight 56 where the LED interval is 30 mm, and the distance between the LED and the light uniform device 25 is 8 mm, and the liquid crystal panel 35 is arranged on the observer side F of the backlight 56, whereby the display device 70 is Obtained.
  • Example 7 The condensing lenses 16 are arranged at a pitch of 150 ⁇ m on a 75 ⁇ m PET substrate on the surface of the observer side F of the light uniform device 25 manufactured in Example 6, and the area of the optical mask 22 is 50% of the pitch of the condensing lenses 16.
  • the optical film 1 thus formed was integrally laminated with an adhesive material to obtain an optical sheet 52.
  • the optical sheet 52 produced in Example 7 is disposed in the backlight 56 where the LED interval is 30 mm and the distance between the LED and the light uniform device 25 is 8 mm, and the liquid crystal panel 35 is disposed on the observer side F of the backlight 56.
  • the display device 70 was obtained.
  • the display devices of this example and comparative example were evaluated by the following measuring methods.
  • the display device 70 was displayed as all white, and the center of the screen was measured with a spectral radiance meter (SR-3A: manufactured by Topcon Technohouse).
  • SR-3A spectral radiance meter
  • Luminance unevenness evaluation The display device 70 was set to display all white, and the entire screen was measured with a luminance unevenness measuring device (ProMetric 1200: manufactured by Radiant Imaging), and analysis was performed using luminance distribution data in a vertical direction of a plurality of cold cathode tubes.
  • the luminance distribution can be obtained as a wave distribution corresponding to the cold cathode fluorescent lamps
  • the luminance data corresponding to the five cold cathode fluorescent lamps at the center is extracted to calculate the average luminance, and then the luminance change with respect to the average luminance is calculated. (%) was calculated.
  • the standard deviation ⁇ of the luminance change is within 1%, it was determined that the diffusibility of the optical sheet was good (OK determination).
  • Table 1 shows the measurement results of this example and the comparative example.
  • Example 3 there was no problem in both luminance and warpage, but the light propagation layer 23 was too thin, so that the light source image could not be completely erased, resulting in NG.
  • Example 4 there was no problem in both luminance and warpage, and the light source image disappeared (OK determination).
  • Example 5 there was no problem in luminance and warpage, and the light source image disappeared (OK determination).
  • Example 6 although the brightness and a slight warp on the light source 41 side occurred, the light source image disappeared with no problem in practical use at 5 mm or less (OK determination).
  • Example 7 the brightness is high and there is no problem with warping (OK determination).
  • Comparative Example 4 there was no problem of warpage, but the total light transmittance of the diffusion base material 26 was high and the haze value was too low, so that the diffusion performance was insufficient and the light source image could not be completely erased.
  • FIG. 1 A diagram showing an example of the lens shape of the light deflection element.
  • A It is a figure explaining the effect of the light diffusion of a light diffusion / reflection layer.
  • B It is a figure explaining the light diffusion effect of the light diffusion / reflection layer.
  • A It is a figure which shows an example which formed the light-diffusion / reflection layer in the top part of the light deflection
  • B A view showing an example in which a light diffusion / reflection layer is formed on the top of the light deflection element.
  • C It is a figure which shows an example which formed the light-diffusion / reflection layer in the top part of the light deflection
  • (D) It is a figure explaining the amount of wraparound to a 1st inclined surface at the time of forming a light-diffusion / reflective layer in the top part of a light deflection
  • (A) It is a figure which shows an example of the lens shape of an optical deflection
  • (B) A diagram showing an example of the lens shape of the light deflection element. It is a figure which shows an example of the lens shape of a light deflection
  • (A) It is a figure explaining the case where the height and pitch of an optical deflection
  • (B) It is a figure explaining the case where the height of the light deflection element is not constant.
  • (C) It is a figure explaining the case where the height and pitch of a light deflection element are constant. It is a figure which shows an example at the time of aligning a light deflection
  • (A) It is a figure which shows the form at the time of integrally forming an optical uniform device.
  • (B) It is a diagram showing a form when the light deflection element is formed into a sheet shape.
  • (A) It is a figure explaining the light ray in case a light propagation layer is a multilayer structure.
  • (B) A diagram illustrating light rays when the light propagation layer has a multilayer structure.
  • A Light intensity distribution of BEF
  • B Light intensity distribution of optical film
  • H K
  • K Light
  • P Light deflection element pitch
  • p Light deflection element first inclined surface pitch
  • m Tangent
  • T Light propagation layer
  • ⁇ an angle formed by one surface of the light propagation layer and the tangent m
  • ⁇ b an angle formed by a tangent line of the first inclined surface of the light deflection element and one surface of the light propagation layer
  • n a refractive index of the light propagation layer
  • n0 refractive index of the light deflection element
  • n1 refractive index of the first layer of the light propagation layer
  • n2 refractive index of the second layer of the light propagation layer
  • F, F ′ observer side
  • X direction of plan view
  • Ve image display device vertical direction
  • Ho image display device horizontal direction
  • ⁇ light diffusion / reflection layer wrapping amount
  • ⁇ farthest intersection point
  • optical film 2 ... optical member, 13 ... valley, 16 ... collection Optical lens, 16a ... third apex, 16b ... third inclined surface, 17 ... light transmitting substrate, 17a ... surface opposite to the observer, 17b ... observer side Surface (flat surface), 20 ... fixed layer, 21 ... light diffusion lens, 21a ... second apex, 21b ... second inclined surface, 22 ... light mask, 23 ... light propagation layer, 23a ... surface opposite to the observer , 23b ... an observer side surface, 23c ... a light diffusion / reflection layer formed on the observer side surface, 23A ... a layer on the light deflection element side of the light propagation layer, 23B ...

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Abstract

L'invention concerne un dispositif optique, un dispositif d'uniformisation de lumière, une feuille optique, une unité de rétro-éclairage et un dispositif d'affichage dans lesquels une image de lampe peut être éliminée par émission uniforme en sortie de lumières incidentes à partir de sources de lumière, et dans lesquels un gauchissement dû à de la chaleur générée par les sources de lumière ne se produit pas, même si la distance entre les sources de lumière et le dispositif optique ou le dispositif d'uniformisation de lumière est raccourcie. À cet effet, l'invention porte sur un dispositif optique, qui comprend une couche de propagation de lumière et un élément de déviation de lumière ayant pour fonction de dévier la lumière dans une direction en deux dimensions. Un dispositif d'uniformisation de lumière est constitué par la formation d'un seul tenant d'une base de diffusion sur le côté surface de sortie de lumière de la couche de propagation de lumière du dispositif optique. Un dispositif d'affichage est constitué par la disposition de l'élément de diffusion de lumière du dispositif optique ou du dispositif d'uniformisation de lumière sur le côté sources de lumière du dispositif d'affichage, et, si nécessaire, par la disposition, en outre, d'un élément optique, ou analogue, sur la couche de propagation de lumière du dispositif optique ou sur la base de diffusion du dispositif d'uniformisation de lumière.
PCT/JP2008/063831 2008-01-29 2008-08-01 Dispositif optique, dispositif d'uniformisation de lumière, feuille optique, unité de rétro-éclairage et dispositif d'affichage Ceased WO2009096057A1 (fr)

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JP2011081036A (ja) * 2009-10-02 2011-04-21 Jiroo Corporate Plan:Kk 光学ユニット及びこれを用いたバックライトユニット
JP2012027083A (ja) * 2010-07-20 2012-02-09 Toppan Printing Co Ltd 光学シートおよび表示装置
JP2012027423A (ja) * 2010-07-28 2012-02-09 Toppan Printing Co Ltd 光学シート、光学シート積層体、バックライトユニット及びディスプレイ装置
JP2012252340A (ja) * 2011-06-03 2012-12-20 Gunko Kagi (Shenzhen) Yugenkoshi 光学シート、その製造方法、および当該光学シートを用いた液晶表示装置
WO2012168858A3 (fr) * 2011-06-10 2013-05-23 Koninklijke Philips Electronics N.V. Dispositif de sortie de lumière et procédé de fabrication
WO2014065363A1 (fr) * 2012-10-26 2014-05-01 シャープ株式会社 Élément de diffusion optique avec plaque polarisante, procédé de fabrication de cet élément de diffusion optique avec plaque polarisante ainsi que dispositif d'affichage
JP2014215404A (ja) * 2013-04-24 2014-11-17 凸版印刷株式会社 光制御シート、ｅｌ素子、照明装置、ディスプレイ装置、および液晶ディスプレイ装置
DE102014201749A1 (de) * 2014-01-31 2015-08-06 Sypro Optics Gmbh Mikrolinsenanordnung und Beleuchtungsvorrichtung zur gleichmäßigeren Ausleuchtung mit Mikrolinsenanordnung
WO2018123543A1 (fr) * 2016-12-28 2018-07-05 日華化学株式会社 Film de diffusion de lumière, agent de revêtement destiné à la formation d'un film de diffusion de lumière et son procédé de fabrication, écran de projection et son procédé de fabrication

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JP2010250302A (ja) * 2009-03-25 2010-11-04 Asahi Kasei Corp 光線制御ユニット
JP2011081036A (ja) * 2009-10-02 2011-04-21 Jiroo Corporate Plan:Kk 光学ユニット及びこれを用いたバックライトユニット
JP2012027083A (ja) * 2010-07-20 2012-02-09 Toppan Printing Co Ltd 光学シートおよび表示装置
JP2012027423A (ja) * 2010-07-28 2012-02-09 Toppan Printing Co Ltd 光学シート、光学シート積層体、バックライトユニット及びディスプレイ装置
JP2012252340A (ja) * 2011-06-03 2012-12-20 Gunko Kagi (Shenzhen) Yugenkoshi 光学シート、その製造方法、および当該光学シートを用いた液晶表示装置
JP2014516198A (ja) * 2011-06-10 2014-07-07 コーニンクレッカ フィリップス エヌ ヴェ 光出力装置及び製造の方法
CN103608920A (zh) * 2011-06-10 2014-02-26 皇家飞利浦有限公司 包括位于led上的散射部分的led阵列及其制作方法
WO2012168858A3 (fr) * 2011-06-10 2013-05-23 Koninklijke Philips Electronics N.V. Dispositif de sortie de lumière et procédé de fabrication
CN103608920B (zh) * 2011-06-10 2016-08-17 皇家飞利浦有限公司 包括位于led上的散射部分的led阵列及其制作方法
US9470380B2 (en) 2011-06-10 2016-10-18 Koninklijke Philips Electronics N.V. Lighting device with electrostatically adhered scattering particles and method of manufacture
WO2014065363A1 (fr) * 2012-10-26 2014-05-01 シャープ株式会社 Élément de diffusion optique avec plaque polarisante, procédé de fabrication de cet élément de diffusion optique avec plaque polarisante ainsi que dispositif d'affichage
JPWO2014065363A1 (ja) * 2012-10-26 2016-09-08 シャープ株式会社 偏光板付き光拡散部材、偏光板付き光拡散部材の製造方法、及び表示装置
JP2014215404A (ja) * 2013-04-24 2014-11-17 凸版印刷株式会社 光制御シート、ｅｌ素子、照明装置、ディスプレイ装置、および液晶ディスプレイ装置
DE102014201749A1 (de) * 2014-01-31 2015-08-06 Sypro Optics Gmbh Mikrolinsenanordnung und Beleuchtungsvorrichtung zur gleichmäßigeren Ausleuchtung mit Mikrolinsenanordnung
DE102014201749B4 (de) * 2014-01-31 2015-08-20 Sypro Optics Gmbh Mikrolinsenanordnung und Beleuchtungsvorrichtung zur gleichmäßigeren Ausleuchtung mit Mikrolinsenanordnung
US10451246B2 (en) 2014-01-31 2019-10-22 Jabil Optics Germany GmbH Microlens arrangement and illumination device for uniform illumination with microlens arrangement
WO2018123543A1 (fr) * 2016-12-28 2018-07-05 日華化学株式会社 Film de diffusion de lumière, agent de revêtement destiné à la formation d'un film de diffusion de lumière et son procédé de fabrication, écran de projection et son procédé de fabrication

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