WO2007049618A1 - Plaque de diffusion de lumiere et dispositif de retroeclairage direct - Google Patents

Plaque de diffusion de lumiere et dispositif de retroeclairage direct Download PDF

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Publication number
WO2007049618A1
WO2007049618A1 PCT/JP2006/321169 JP2006321169W WO2007049618A1 WO 2007049618 A1 WO2007049618 A1 WO 2007049618A1 JP 2006321169 W JP2006321169 W JP 2006321169W WO 2007049618 A1 WO2007049618 A1 WO 2007049618A1
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WO
WIPO (PCT)
Prior art keywords
light
linear
sin
prism
light incident
Prior art date
Application number
PCT/JP2006/321169
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English (en)
Japanese (ja)
Inventor
Kenji Kusano
Original Assignee
Zeon Corporation
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Filing date
Publication date
Application filed by Zeon Corporation filed Critical Zeon Corporation
Priority to JP2007542596A priority Critical patent/JPWO2007049618A1/ja
Publication of WO2007049618A1 publication Critical patent/WO2007049618A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • G02B5/0226—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 having particles on the surface
    • 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
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • 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

Definitions

  • the present invention relates to a light diffusing plate and a direct type backlight device. More specifically, the present invention relates to a light diffusing plate and a direct backlight device having high luminance and high luminance uniformity.
  • a backlight device for a liquid crystal display a device using a cold cathode tube as a light source has been widely used, and there are a method called an edge light type and a method called a direct type.
  • the edge light type device has a constitutional force in which a cold-cathode tube of a thin tube is arranged at the end side of the light guide plate, and the light incident on the end surface force is repeatedly reflected in the light guide plate and is emitted to the main surface of the light guide plate.
  • the direct type backlight device is a combination of a plurality of cold cathode tubes (linear light sources) arranged in parallel, a reflector provided on the back of the cold cathode tube, and a light diffusing plate forming a light emitting surface. There will be power.
  • the direct type device can increase the number of cold-cathode tubes used, so that the luminance of the light emitting surface can be easily increased.
  • the direct type apparatus has a problem in that the brightness is increased directly above the cold cathode tube, thereby causing periodic brightness unevenness and deterioration in brightness uniformity on the light emitting surface. For this reason, there is a problem that display unevenness occurs on the display screen of the liquid crystal display due to poor luminance uniformity on the light emitting surface of the device.
  • Patent Document 1 JP-A-6-273760
  • Patent Document 2 Japanese Patent Laid-Open No. 2001-174813
  • An object of the present invention is to provide a light diffusing plate and a direct backlight device having improved luminance and luminance uniformity.
  • the present inventors have surprisingly found that in a direct type backlight device, a prism having a sawtooth cross section on the light exit surface of the light diffusing plate.
  • the effect of improving the brightness uniformity is not sufficient by simply providing the rows, but we have found that a device with high brightness and good brightness uniformity can be obtained by making the prism row a specific shape.
  • the luminance uniformity can be increased to some extent, but a pair of inclining at the same angle in opposite directions within a predetermined range. It was found that the brightness uniformity can be further improved by providing two or more pairs of the above.
  • a light diffusing plate comprising a light incident surface on which light is incident and a light exit surface that is formed on a surface opposite to the light incident surface and diffuses and emits the incident light.
  • the light incident surface is a substantially flat flat surface
  • the light exit surface includes a prism array having a plurality of polygonal linear prisms having a concave or convex cross section, and each linear prism is
  • a light diffusing plate having four or more surfaces and a polygonal cross-sectional shape having a line symmetry with respect to a normal line of the light incident surface.
  • a direct-type backlight device comprising: a light diffusion plate described above.
  • each linear prism is based on a normal line of the light incident surface.
  • a first surface group having a plurality of surfaces inclined to one side, and a second surface group having a plurality of surfaces inclined to the opposite side to each surface constituting the first surface group.
  • the number of surfaces is S, and the first surface and second surface are formed in order from the smallest angle formed by the surface and the light incident surface.
  • the angle between the arbitrary j-th surface and the light incident surface is Xj (°), and the j-th surface force is the closest to the linear light source and the second surface.
  • a light diffusing plate for diffusing and emitting light of linear light source power, a light incident surface on which light from the linear light source is incident, and a surface opposite to the light incident surface
  • a light exit surface that diffuses and emits light incident from the light incident surface, the light incident surface is a substantially flat flat surface, and the light exit surface has a concave or convex cross section.
  • a prism array having a plurality of polygonal linear prisms, wherein the polygon has a line-symmetric shape with respect to a normal line of the light incident surface, and the prism array has a shape.
  • a plurality of different types of linear prisms and in the direction perpendicular to the longitudinal direction of the linear prisms and parallel to the light incident surface, the plurality of types of linear prisms are within the range of the width of the linear light source.
  • a light diffusion plate characterized by including all types of linear prisms.
  • a direct-type backlight device comprising: a light diffusion plate described above.
  • each linear prism includes at least two inclined surfaces.
  • the types of slopes included in all the linear prisms are S, and the first slope, the second slope, and so on, in ascending order of the angle between the slope and the light incident surface.
  • An angle between an arbitrary jth jth slope and the light incident surface is Xj (°)
  • the linear light source and the second position closest to the first from the jth slope W (mm) is the distance between the linear light source and the light incident surface
  • the distance between the light source and the center of the linear light source is a (mm).
  • the distance from the light incident surface is bj (mm)
  • the angle between the longitudinal direction of the linear prism and the longitudinal direction of the linear light source is Y ( )
  • the refractive index of the transparent resin is ⁇
  • the relationship of Equation (1) is satisfied when j ⁇ 2
  • the direct type backlight device of the present invention including the light diffusion plate of the present invention is useful as a knock light for a display device such as a liquid crystal display having high luminance and luminance uniformity.
  • FIG. 1 is a longitudinal sectional view showing an example of a light diffusing plate and a direct backlight device according to the present invention.
  • FIG. 2 is a longitudinal sectional view showing another example of the light diffusion plate of the present invention.
  • FIG. 3 is a longitudinal sectional view showing still another example of the light diffusion plate of the present invention.
  • FIG. 4 is a schematic longitudinal sectional view showing a light diffusing plate and a linear light source in the direct type backlight device of the present invention in order to explain the significance of the mathematical expressions (1) to (3). .
  • FIG. 5 is a partial cross-sectional view showing an example of a region 50 in FIG. 4 in an enlarged manner.
  • FIG. 6 is a longitudinal sectional view showing still another example of the light diffusing plate and the direct type backlight device of the present invention.
  • FIG. 7 is a longitudinal sectional view showing still another example of the light diffusing plate of the present invention.
  • FIG. 8 is a perspective view showing an outline of a relationship among a light diffusing plate, a linear light source, and a reflecting plate in the direct type backlight device of the present invention.
  • FIG. 9 is a partial cross-sectional view showing another example of the region 50 in FIG. 4 in an enlarged manner.
  • FIG. 10 is a cross-sectional view showing an example of a cross-sectional shape of a linear prism in the light diffusion plate of the present invention.
  • FIG. 11 is a cross-sectional view showing another example of the cross-sectional shape of the linear prism in the light diffusion plate of the present invention.
  • the light diffusing plate of the present invention is a light diffusing plate for diffusing light from a light source, particularly a linear light source.
  • a cold cathode tube, a hot cathode tube, a linearly arranged LED, a combination of an LED and a light guide, and the like can be used.
  • two parallel tubes are connected by a single semi-circle to form a single U-shape, and three parallel tubes.
  • the distance between the centers of the parallel parts of the tube is the distance W between the centers of adjacent linear light sources.
  • the linear light source is preferably a linearly arranged LED, or a combination of an LED and a light guide, from the viewpoint of luminous efficiency, which is preferable for cold cathode fluorescent lamps in terms of luminance uniformity.
  • a linear array of LEDs or a combination of LEDs and light guides if there are a series of arrayed LED pairs or multiple combinations of LEDs and light guides, there are multiple linear light sources.
  • the light diffusing plate of the present invention is provided on the opposite side of the light incident surface on which light from the light source is incident and the light that diffuses and exits the light incident from the light incident surface. And an exit surface.
  • the light incident surface is formed as a substantially flat flat surface having no irregularities, and a specific structure is formed on the light emitting surface.
  • the substantially flat surface means a surface having a center line average surface roughness (Ra) force of 5 ⁇ m or less, preferably 3 ⁇ m or less, more preferably 1 ⁇ m or less.
  • the light diffusing plate of the present invention includes a prism array having a plurality of linear prisms having a polygonal force having a concave or convex cross section on the light exit surface.
  • the prism array will be described using the light diffusion plate 301 shown in FIG. 8 as an example.
  • the prism array 301B is configured by a plurality of linear prisms 301 A substantially parallel to each other, and a cross section perpendicular to the longitudinal direction of the linear prisms 301 A is roughly formed in a sawtooth shape. It has been done.
  • the prism row is expressed in a uniform sawtooth shape for a very schematic illustration.
  • the light diffusion plate of the present invention has a specific shape as described later.
  • the polygon includes, for example, the pentagon shown in FIG. 10, the heptagon shown in FIG.
  • a triangle is particularly preferable from the viewpoint of easy formation.
  • these different types of polygons may be mixed in one light diffusion plate.
  • the term “polygon” refers to the cross-sectional plane corresponding to each concave or convex portion of the linear prism for convenience of explanation.
  • the linear prism having a concave cross section is perpendicular to the longitudinal direction of the linear prisms constituting the prism row, such as a region U2 shown in FIG. 1 and a region U603 shown in FIG.
  • a cross section hereinafter, simply referred to as a “cross section” in a row
  • a linear prism having a convex cross section is a region U1 shown in FIG. 1 and regions U601 and U602 shown in FIG. The area between.
  • the light diffusion plate of the present invention satisfies at least one of the following requirements (i 1) or (ii 1):
  • Each linear prism force has 4 or more faces
  • the polygon is a line-symmetric shape with respect to a normal line of the light incident surface, and the prism array includes a plurality of types of linear prisms having different shapes, and the longitudinal direction of the linear prisms In a direction that is perpendicular and parallel to the light incident surface,
  • All types of the plurality of types of linear prisms are included within the range of the width dimension of the linear light source.
  • the light diffusing plate satisfying the requirement (i-1) is referred to as “light diffusing plate (i)”, and the light diffusing plate satisfying the requirement (ii-1) is referred to as “light diffusing plate (ii)”.
  • each linear prism has four or more surfaces, and the polygon which is the cross-sectional shape thereof is a line-symmetric shape with respect to the normal line of the light incident surface. More specifically, each of the linear prisms has a first surface group having a plurality of surfaces inclined on one side, and opposite to each surface constituting the first surface group. A second surface group having a plurality of inclined surfaces, and in the cross section of the row, a polygonal line shape drawn by the first surface group and a polygonal line shape drawn by the second surface group are: The shape is axisymmetric about the normal line of the light incident surface.
  • the first surface group and the second surface group that are inclined in directions opposite to each other with respect to the normal line of the light incident surface are specifically the surfaces 6a and 7a in the example shown in FIG. 2 and a plane group consisting of planes 6b and 7b, and in the example shown in FIG. 2, a plane group consisting of planes 8a and 9a and a plane group consisting of planes 8b and 9b.
  • the number of surfaces constituting the linear prism is preferably 4 or more and 10 or less. Of these surfaces, the number of surfaces inclined in the opposite direction to the normal of the flat surface is preferably 2 or more and 5 or less, respectively.
  • each surface of the linear prism and the light incident surface is such that, for example, as shown in FIGS. 1 and 2, the surface is closer to the light incident surface, the angle being larger, or for example, the surface illustrated in FIG. A surface having a larger angle can be taken as a surface with a far light incident surface force such as 10-12.
  • the linear prism is the center line of the linear prism (that is, the normal line of the light incident surface, and when the linear prism is convex, the peak of the linear prism is concave, and the linear prism is concave
  • the same number of surfaces may be provided on the left and right sides (that is, on one side and the other side of the center line in the cross section of the prism row) centering on the line passing through the valley portion of the linear prism. This is preferable for increasing the luminance uniformity.
  • Each of the surfaces constituting the linear prism is a pair of surfaces on the left and right sides of the linear prism, with the inclination direction being opposite and the inclination angle being equal.
  • the angle formed by the light incident surface and the right surface 6a and the angle formed by the light incident surface and the left surface 6b are equal XI and form a pair.
  • the angle formed by the light incident surface and the right surface 7a and the angular force formed by the light incident surface and the left surface 7b are the same angle X2 and form a pair.
  • the angle formed by the light incident surface and the right surface 8a and the angular force formed by the light incident surface and the left surface 8b are the same angle XI, making a pair, and the light incident surface and the right surface
  • the angle formed by the surface 9a and the angular force formed by the light incident surface and the left surface 9b are the angle X2, which form a pair.
  • the surfaces of the linear prisms are bilaterally symmetric about the center line as in the examples shown in FIGS. 1 and 3, and the linear prisms arranged in parallel have substantially the same cross-sectional shape.
  • the shapes of the linear prisms arranged in parallel may be different.
  • the area force of the surface 8 near the vertex of the linear prism is configured differently for each of the parallel linear prisms.
  • the polygon in the linear prism has a line-symmetric shape about the normal line of the light incident surface (normal line passing through the vertex of the polygon).
  • the cross-sectional shape of the linear prism is a triangle
  • the triangle is isosceles It becomes a triangle.
  • the angle formed between each of the two slopes constituting each pair of one or more symmetrical slopes constituting the polygon and the light incident surface is equal.
  • the two slopes are two slopes that are not parallel to the light incident surface when a linear prism is selected so that the cross section is a symmetric polygon.
  • the light diffusing plate can be easily designed and manufactured, and the luminance uniformity of the direct type backlight device as a product can be increased, and the viewing angle can be widened to some extent.
  • the angle between each of the two inclined surfaces and the light incident surface is “equal” when the difference between the angles is within.
  • the apex of the linear prism may be rounded.
  • the angle formed is the angle formed between the linear portion of the two inclined surfaces constituting the linear prism and the light incident surface. Show.
  • the prism array includes a plurality of types of the linear prisms having different shapes.
  • the type of linear prism is not particularly limited as long as it is two or more, but it is preferably 3 or more and 5 or less. By using 3 or more types, high brightness uniformity can be obtained.
  • the linear prism can be accurately arranged at a desired position when the light diffusing plate is manufactured by a mold or the like.
  • linear prisms classified into the same type mean the sum of the angles formed by the two inclined surfaces constituting each pair and the light incident surface and the sum of the angles of all linear prisms. The difference between the average angle and the average angle is within 1 degree.
  • the prism row is perpendicular to the longitudinal direction of the linear prism and parallel to the light incident surface (that is, the horizontal direction in FIGS. 6 and 7).
  • width direction all types of the plurality of types of linear prisms are included within the range of the width dimension of the linear light source.
  • the “width dimension” of the linear light source in the case of a cylindrical linear light source, the diameter can be the width dimension.
  • the width dimension of the linear light source is preferably 2 to: LOmm.
  • the fact that all types of the plurality of types of linear prisms are included within the range of the width dimension of the linear light source means that almost all of the prism rows in the width direction are within the range of the width dimension. This includes all types of the plurality of types of linear prisms. With such a configuration, since the incident light is emitted in the normal direction of the light incident surface in at least one of the width dimensions, the luminance uniformity is improved. [0030] In the light diffusion plate (ii), the linear prisms may be regularly arranged in the prism row as long as the above requirements are satisfied.
  • a region unit force including all kinds of sets of a plurality of linear prisms is repeatedly arranged in the prism array, and the repetitive pitch force of the region unit is the same as the width dimension of the linear light source. Or a shorter mode can be mentioned. More specifically, the width of the repetition pitch of the area unit is 0.05 mn! ⁇ 5. Can be Omm.
  • the number of the linear prisms per one area unit is not particularly limited, and includes one or more of all types of the plurality of linear prisms! /.
  • the prism array provided on the light exit surface 604 of the light diffusing plate 601 includes a region unit U611 including the linear prism 611 in the region U601 and the linear prism 612 in the region U602. Have.
  • the region unit U611 includes a flat portion 613 in addition to the linear prism.
  • the angle X601 formed by the inclined surface of the linear prism 611 and the light incident surface is different from the angle X602 formed by the inclined surface of the linear prism 612 and the light incident surface.
  • the area unit U611 is repeated in the width direction to form a prism row.
  • the diameters or width dimensions D1 of the linear light sources 602a and 602b are larger than the width of the region unit U611. Accordingly, at any position in the width direction of the prism row, In the range of dimensions, both the linear prisms 611 and 612 are included, and a configuration including all types of a plurality of types of linear prisms within the range of the width dimension of the linear light source is achieved.
  • the region unit U211 having four types of linear prisms U21, U22, U23, and U24 in this order is repeatedly arranged, so that these four types of linear prisms are regularly arranged. Is provided.
  • the width of the area unit U211 is the same as the width dimension of D1, so that all the linear prisms U21 to U24 are included in the range of the dimension of D1 at any position in the width direction of the prism row.
  • a configuration including all types of a plurality of types of linear prisms within the range of the width dimension of the linear light source is achieved.
  • the thickness of the light diffusion plate of the present invention is not particularly limited, but is preferably 0.4 mm to 5 mm, more preferably 0.8 mm to 4 mm. If the thickness is less than 0.4mm It is necessary to devise measures for suppressing the deflection due to its own weight, such as forming a large number of support columns. Also, if the thickness exceeds 5 mm, molding becomes difficult.
  • the pitch of the linear prisms of the light diffusion plate that is, the distance between the crests or troughs of adjacent linear prisms is preferably 20 ⁇ m or more and 700 ⁇ m or less. More preferably, it is 30 to 500 ⁇ m, and more preferably 40 to 400 ⁇ m. If the pitch is less than the preferred range, it may be difficult to give the shape because the shape is fine, or the light diffusion effect may be reduced. When the pitch exceeds the preferable range, the light diffusion becomes rough, and there is a risk of uneven brightness.
  • the direction in which the light is diffused by roughening the surface of the prism row of the light diffusing plate can be varied within an appropriate range.
  • the centerline average surface roughness (Ra) when the surface of the linear prism is measured at 20 ⁇ m perpendicular to the longitudinal direction is preferably 0.08 ⁇ m or more and 3 ⁇ m or less. It is more preferably from 0.09 ⁇ m to 2 ⁇ m, and even more preferably from 0.1 m to 1 ⁇ m.
  • the material of the light diffusing plate of the present invention is not particularly limited, and may be a composition containing glass, rosin and rosin.
  • a composition containing cocoa butter or rosin a mixture of two or more kinds of cocoons that are difficult to mix, or a transparent resin in which a light diffusing agent is dispersed can be used.
  • light diffusion and light diffusion into transparent resin are easy because adjustment of total light transmittance and haze is preferred because of its light weight and ease of molding, which is preferable for a composition containing resin or resin.
  • Those in which a plate is dispersed are particularly preferred.
  • the entire light diffusing plate including the prism array portion by dispersing a light diffusing agent in a transparent resin, and to adjust the entire light diffusing plate to the same total light transmittance and haze. This is more preferable because the direction of light emitted from the plate can be further diversified.
  • the content of the light diffusing agent in the product in which the light diffusing agent is dispersed in the transparent resin there is no particular restriction on the content of the light diffusing agent in the product in which the light diffusing agent is dispersed in the transparent resin. Normally, it is preferable to adjust the content of the light diffusing agent so that the total light transmittance of the dispersion is 60% or more and 100% or less.
  • the content of the light diffusing agent is 80% or more and 100% or less. It is more preferable to adjust the content of light diffusing agent so that it becomes 90% or more and 100% or less. Better to adjust the amount ,.
  • It is preferable to adjust the content of the light diffusing agent so that the haze is 0% or more and 95% or less. It is more preferable to adjust the content of the light diffusing agent so that the haze is 0% or more and 90% or less.
  • the luminance can be further improved by setting the total light transmittance to 60% or more and the haze to 95% or less, and by setting the total light transmittance to 100% or less and the haze to 0% or more, the luminance uniformity can be further improved. Can be improved.
  • a resin having a total light transmittance of 70% or more measured with a transparent resin and a 2 mm thick plate smoothed on both sides with ⁇ IS K7361-1 for example, polyethylene and propylene ethylene.
  • a copolymer or fat of polycarbonate, polystyrene, an aromatic vinyl monomer containing 10% or more of an aromatic bur monomer and a (meth) acrylic acid alkyl ester having a lower alkyl group a resin having a water absorption of 0.25% or less, such as a resin having a cyclic structure, is preferable in that a large light diffusing plate with little warpage can be obtained because deformation due to moisture absorption is small.
  • a resin having an alicyclic structure is more preferable because it has good fluidity, can efficiently produce a large light diffusion plate, and can form a prism row with a specific shape as designed.
  • a compound obtained by mixing oxalic resin having an alicyclic structure and a light diffusing agent has both high permeability and high diffusibility necessary for a light diffusing plate, and has good chromaticity, so that it can be suitably used.
  • (meth) acrylic acid refers to acrylic acid and metathallic acid.
  • the resin having an alicyclic structure is a resin having an alicyclic structure in the main chain and Z or side chain. From the viewpoints of mechanical strength, heat resistance, and the like, a resin containing an alicyclic structure in the main chain is particularly preferable.
  • the alicyclic structure include a saturated cyclic hydrocarbon (cycloalkane) structure and an unsaturated cyclic hydrocarbon (cycloalkene, cycloalkyne) structure. From the viewpoint of mechanical strength, heat resistance, etc., cycloalkane structure is preferred to cycloalkene structure. Of these, a cycloalkane structure is most preferred.
  • the number of carbon atoms that make up the alicyclic structure is
  • the mechanical strength, heat resistance and formability of the light diffusing plate are usually in the range of 4-30, preferably 5-20, more preferably 5-15. Is highly balanced and suitable.
  • the ratio of the repeating unit having an alicyclic structure in the alicyclic structure having an alicyclic structure may be appropriately selected depending on the purpose of use, but is usually 50% by weight or more, preferably 70% by weight or more, more preferably Is over 90% by weight. If the proportion of the repeating unit having an alicyclic structure is too small, the heat resistance is lowered, which is not preferable.
  • the repeating unit other than the repeating unit having an alicyclic structure in the alicyclic resin having an alicyclic structure is appropriately selected according to the purpose of use.
  • the resin having an alicyclic structure include (1) a ring-opening polymer of a norbornene monomer and other monomers capable of ring-opening copolymerization with the norbornene monomer. Ring-opening copolymers with these, hydrogenated products thereof, addition polymers of norbornene monomers, addition copolymers of norbornene monomers with other monomers copolymerizable therewith, etc.
  • norbornene polymers and vinyl alicyclic hydrocarbon polymers are preferable from the viewpoint of heat resistance, mechanical strength, and the like, and ring-opening polymer hydrogenated norbornene monomers of norbornene monomers are preferred.
  • Hydrogenated product of ring-opening copolymer of monomer and other monomer capable of ring-opening copolymerization, aromatic of hydrogenated polymer of vinyl aromatic monomer, and vinyl aromatic monomer More preferred is a hydrogenated aromatic ring of a copolymer of a monomer and another monomer copolymerizable therewith.
  • the light diffusing agent used in the light diffusion plate is a particle having a property of diffusing light, and is roughly classified into an organic filler and an organic filler.
  • inorganic fillers include silica, aluminum hydroxide, aluminum oxide, titanium oxide, zinc oxide, barium sulfate, and the like. And magnesium silicate, or a mixture thereof.
  • specific materials for the organic filler include acrylic resin, acrylonitrile, polyurethane, polysalt resin, polystyrene resin, polyacrylonitrile, polyamide, polysiloxane resin, melamine resin, and Benzoguanamine-based rosin can be used.
  • polystyrene-based resins and polysiloxane-based resins or fine particles that also have cross-linked strength are particularly suitable because of their high dispersibility, high heat resistance, and no coloration (yellowing) during molding. It can be used for Fine particles having a cross-linked strength of polysiloxane-based resin are more excellent in heat resistance and can be used more suitably.
  • the shape of the light diffusing agent used in the light diffusing plate is not particularly limited, and examples thereof include a spherical shape, a cubic shape, a needle shape, a rod shape, a spindle shape, a plate shape, a scale shape, and a fiber shape. Spherical beads capable of making the light diffusion direction isotropic are preferred.
  • the light diffusing agent is used in a state of being dispersed in the transparent resin.
  • the refractive index of the material constituting the light diffusing plate of the present invention is not particularly limited, but can be in the range of 1.2 to 2.0.
  • the prism row having the specific shape on the surface thereof.
  • the prism row may be formed on the surface of the flat light diffusing plate.
  • prism stripes can be formed simultaneously with the formation of the light diffusing plate.
  • the method of forming the prism row on the surface of the flat light diffusion plate For example, it can be performed by cutting using a tool capable of forming a linear prism having a desired shape, or can be photocured. A resin can be applied and hardened in a state where a mold having a desired shape is transferred.
  • the light diffusion plate When the light diffusion plate is manufactured by extrusion molding and the prism rows are formed at the same time, it can be extruded by using a deformed die having a desired prism row shape, or the prisms can be embossed after extrusion. A row can also be formed.
  • a casting mold capable of forming a desired prism row shape can be used.
  • a mold capable of forming a desired prism row shape can be used.
  • the mold used for forming the row is obtained by cutting the mold into a metal member using a tool capable of forming a desired linear prism, or by electroplating on the member on which the desired shape is formed. be able to.
  • a direct type backlight device of the present invention includes a plurality of the linear light sources arranged in parallel, a reflecting plate that reflects light from the linear light sources, and the light diffusion plate of the present invention.
  • the reflector used in the present invention is not particularly limited, but white or silver colored resin, metal, etc. can be used, and the color is preferably white because the brightness uniformity is improved. From the point of view of ⁇ ⁇ , rosin is preferred.
  • the reflecting plate can be provided at a position opposite to the light diffusion plate of the linear light source, like the reflecting plate 603 shown in FIG. 6 and the reflecting plate 303 shown in FIG.
  • Particularly preferred embodiments of the direct type backlight device of the present invention include those satisfying the requirement (i 2) below or those satisfying the requirement (ii 2) below:
  • the light diffusing plate is the light diffusing plate (i) described above, and includes a transparent resin, and each linear prism is based on the normal line of the light incident surface.
  • a first surface group having a plurality of surfaces inclined on one side, and a second surface group having a plurality of surfaces inclined on the opposite side to each surface constituting the first surface group.
  • the number of the surfaces is S, and the first surface, the second surface,.
  • the angle between the arbitrary j-th light incident surface and the light incident surface is Xj (°)
  • the j-th surface force is closest to the linear light source at the position
  • the second closest to the position is the linear shape at the position
  • the distance from the light source is W (mm)
  • the distance between the center of the linear light source and the light incident surface is a (mm)
  • the distance between the center of the j-th surface and the light incident surface is bj (mm)
  • the light diffusing plate is the light diffusing plate (ii) described above, is configured to include a transparent resin, and the type of slope included in all the linear prisms is S type.
  • the angle formed is Xj (°)
  • the distance between the linear light source and the light incident surface is W (mm), and the distance between the center of the linear light source and the light incident surface is a (mm).
  • the direct backlight device of the present invention that satisfies the requirement (i 2) is referred to as "direct backlight device (i)", and the direct backlight of the present invention that satisfies the requirement (ii-2).
  • the light device is called “direct backlight device (ii)”!
  • the direct type backlight device (i) and the direct type backlight device (ii) are preferable in terms of high luminance uniformity and a direct type backlight device. More preferably, in the direct-type backlight device (i) and the direct-type backlight device (ii), it is more preferable that the following equation (3) holds when j ⁇ 1. It is preferable for increasing the degree.
  • Xj can take a value of 0 to 90 °.
  • the value of W is not particularly limited, but is preferably 15 to 150 mm, more preferably 20 to: LOOmm. preferable.
  • the value of a is not particularly limited, and is preferably 5 to 30 mm, more preferably 5 to 25 mm if it is designed in consideration of the thickness and luminance uniformity of the direct type backlight device. Further, the value of b is preferably 0.4 to 5 mm.
  • Xj is the angles XI and X2
  • P is the distance between the centers of the linear light sources 2a and 2b
  • a is the distance from the linear light source 2a or 2b to the light incident surface 5.
  • Bj is the distance indicated by arrows bl and b2.
  • Xj is the angles X601 and X602
  • W is the distance between the centers of the linear light sources 602a and 602b
  • a is the light incident surface 605 from the linear light source 602a or 602b.
  • b is the distance indicated by arrows b601 and b602.
  • the center of the j-th surface means the cross section of the row as shown by the upper ends of arrows bl and b2 in FIG. 1 and the upper ends of arrows b601 and b602 in FIG. The intermediate point between one end of each surface and the other end.
  • the "angle between the longitudinal direction of the linear prism and the linear light source” is the longitudinal direction and linear shape of the linear prism when viewed from the direction perpendicular to the light incident surface.
  • the range of the value of ⁇ is not particularly limited and can be 0 to 90 °, but the upper limit is preferably 60 ° or less, more preferably 50 ° or less, and even more preferably 45 ° or less.
  • the angle between the linear light source and the prism row can be 60 ° or less, uneven brightness can be reduced.
  • Each of the above parameters is preferably constant in order to improve the luminance uniformity in the direct type backlight device. However, even if it is not constant, if each region satisfies the above conditions, Favorable effects based on
  • FIG. 4 is a schematic cross-sectional view of a direct type backlight device for explaining the significance of the above formulas (1) to (3).
  • FIG. 5 is an enlarged view of a portion 50 in FIG. 4 when the direct type backlight device is the direct type backlight device (i), and shows a cross-sectional view of one linear prism.
  • FIG. 9 is an enlarged view of a portion 50 in FIG. 4 in the case where the direct type backlight device is the direct type backlight device (ii), and shows a sectional view of one region unit.
  • the light is directed from the upper side to the lower side in FIG. 4, in other words, from the light emitting surface on which the linear prism is formed (here, it is virtually a light incident surface) to the flat light incident surface.
  • the bottom surface For the case where light perpendicular to the bottom surface is incident on the surface (here it is virtually a light exit surface; hereinafter referred to as the “bottom surface”).
  • one region unit has three regions. Since it has a surface, in all cases, images of three linear light sources are observed. [0064] Therefore, if the Xj is designed so that the image of the linear light source exists at an appropriate distance between the adjacent linear light sources and up to half the distance, the luminance uniformity can be greatly improved. . In other words, it is preferable to design so that there are S images at half the distance (WZ2) between adjacent linear light sources. In this case, it is preferable that the linear light source images are arranged at equal intervals of WZ2S.
  • the position should be (2j-1) XW) / (2X (2 XS)) + W / 2S) from (2 G 1) XW) / (2X (2XS)) — W / 2S).
  • the lower limit value is WX (3 ⁇ 4-3) / (4XS)
  • the upper limit value is WX (3 ⁇ 4 + l) / (4XS).
  • the lower and upper limit values correspond to the left side and the right side of Equation (2), respectively. More preferably, the width is WZ4S, which corresponds to the above formula (3).
  • the part up to) is the horizontal distance at which light reaches the same plane as the center of the light source when considering the same state.
  • the area of the surface involved in the formation of the image of the linear light source is increased. Accordingly, it is possible to improve the luminance at the portion where the image is observed.
  • the direct type backlight device of the present invention may be modified within a range of equal force including the linear light source, the reflector, and the light diffusing plate as essential components.
  • any component can be included.
  • a diffusion sheet and a prism sheet may be provided on the far side of the light source of the light diffusion plate.
  • the following (A) and Z or (B) may be provided on the far side of the light source of the two types of sheets:
  • a laminate including a phase difference element of 20 nm to 1 lOOOnm and a 1Z4 wavelength plate.
  • Still another example of the reflective polarizer is a reflective polarizer (for example, JP-A-6-508449 (corresponding publication: (Refer to International Publication Pamphlet W092 / 22838)); Reflective polarizer utilizing selective reflection characteristics of cholesteric liquid crystal; specifically, a laminate of a film made of cholesteric liquid crystal and a 1Z4 wavelength plate (for example, JP-A-3-45906 (corresponding to US Pat. No. 5,235,443); a reflective polarizer with a fine metal linear pattern (for example, JP-A-2-45906) (Refer to Japanese Patent No.
  • Reflective polarizer that uses the anisotropy of reflectivity due to refractive index anisotropy by laminating at least two types of polymer films (for example, Japanese translations of PCT publication No. 9-506837) Gazettes (corresponding gazette: International Publication Pamphlet W095Z173 03)
  • a reflective polarizer having a sea-island structure formed of at least two types of polymers in a polymer film and utilizing the anisotropy of the reflectance due to the refractive index anisotropy (for example, US Pat. No.
  • the use of the direct type backlight device of the present invention is not particularly limited, but can be preferably used as a backlight in a display device such as a liquid crystal display.
  • a display device such as a liquid crystal display.
  • a resin having an alicyclic structure as a transparent resin (manufactured by Nippon Zeon Co., Ltd., ZENOOR 1060 R, refractive index 1.53) 99.85 parts by weight, and fine particles of a crosslinked product of polysiloxane polymer as a light diffusing agent (Tospearl 120, manufactured by GE Toshiba Silicone Co., Ltd.)
  • a prism shape is transferred to the surface by injection molding using a mold with a predetermined prism shape.
  • a light diffusing plate 1 having an outer diameter of 310 mm X 280 mm and a thickness of about 2. Omm was produced.
  • This light diffuser had a total light transmittance of 93% and a ⁇ z of 93%.
  • a reflective sheet (product name: RF188, manufactured by Gidden Co., Ltd.) is attached to the bottom and side surfaces of the housing having an opening with an inner width of 300 mm, a depth of 200 mm, and a depth of 18 mm.
  • Eight cold-cathode tubes with a length of 4 mm and a length of 360 mm are separated from the bottom by 2 mm, the center-to-center distance is 25 mm, parallel to the longitudinal direction of the opening and evenly arranged in the depth direction, and an inverter is connected to this.
  • the light diffusion plate 1 was placed so that the prism row was parallel to the cold cathode tube and located on the light emitting surface side.
  • the cold-cathode tube was turned on so that the tube current was 6.5 mA, and a two-dimensional color distribution measuring device (co- Measure the luminance at 100 points at equal intervals on the center line in the short direction and use the average luminance La and the luminance uniformity according to the following equations (4) and (5).
  • the degree Lu was calculated, the average luminance was 3536 cdZm 2 and the luminance uniformity was 0.9.
  • the luminance uniformity is an index indicating the uniformity of luminance. The smaller the numerical value, the higher the luminance uniformity.
  • a light diffusing plate 2 was produced in the same manner as in Example 1 except that a mold having a predetermined prism shape different from that used in Example 1 was used.
  • One surface of the light diffusing plate 2 is formed with a prism array having the shape shown in Table 1 in parallel with the long side, and the other is a flat surface (seven pieces?).
  • a direct backlight device was fabricated and evaluated in the same manner as in Example 1 except that the light diffusing plate 2 was used in place of the light diffusing plate 1.
  • the average luminance was 3540 cd / m 2 and the luminance uniformity was 0.7.
  • Table 3 shows the values of a, bj, n, j, W, S, and Xj on each surface of the prism array of this direct type backlight device.
  • a light diffusing plate 3 was produced in the same manner as in Example 1 except that a mold having a predetermined prism shape different from that used in Example 1 was used. On one surface of the light diffusing plate 3, a prism array having the shape shown in Table 1 is formed in parallel with the long side, and the other is a flat surface (?? 7 pieces).
  • a direct type backlight device was manufactured and evaluated in the same manner as in Example 1 except that this light diffusion plate 3 was used in place of the light diffusion plate 1.
  • the average luminance was 3572cdZm 2 and the luminance uniformity was 0.7.
  • Table 3 shows the values of a, bj, n, j, W, S, and Xj on each surface of the prism array of this direct type backlight device.
  • Example 4 A light diffusing plate 4 was produced in the same manner as in Example 1 except that a mold having a predetermined prism shape different from that used in Example 1 was used. On one surface of the light diffusing plate 4, a prism row having the shape shown in Table 1 is formed in parallel with the long side, and the other is a flat surface (?
  • a direct type backlight device was manufactured and evaluated in the same manner as in Example 1 except that this light diffusion plate 4 was used in place of the light diffusion plate 1.
  • the average luminance was 3497cdZm 2 and the luminance uniformity was 0.6.
  • Table 3 shows the values of a, bj, n, j, W, S, and Xj on each surface of the prism array of this direct type backlight device.
  • a light diffusing plate 5 was produced in the same manner as in Example 1 except that a mold having a predetermined prism shape different from that used in Example 1 was used. On one surface of the light diffusing plate 5, prism rows having the shapes shown in Table 2 were formed in a direction forming an angle of 30 degrees with the long side, and the other was a flat surface.
  • This light diffusing plate 5 was used in place of the light diffusing plate 1, and the ridgeline of the prism row and the cold cathode tube were positioned at an angle of 30 degrees.
  • Type backlight device was created and evaluated. The average luminance was 3588 cdZm 2 and the luminance uniformity was 0.6.
  • Table 3 shows the values of a, bj, n, j, W, S, and Xj on each surface of the prism array of this direct type backlight device.
  • a light diffusing plate 6 was produced in the same manner as in Example 1 except that a mold having a predetermined prism shape different from that used in Example 1 was used. On one surface of the light diffusing plate 6, a prism row having the shape shown in Table 2 is formed in parallel with the long side, and the other is a flat surface (?? 7 pieces).
  • a direct type backlight device was manufactured and evaluated in the same manner as in Example 1 except that this light diffusion plate 6 was used in place of the light diffusion plate 1.
  • the average brightness was 3484cdZm 2 and the brightness uniformity was 2.2.
  • the light diffusing plate 7 was produced in the same manner as in Example 1 except that On one surface of the light diffusing plate 7, a prism array having the shape shown in Table 2 is formed parallel to the long side, and the other is a flat surface (?? 7 pieces).
  • a direct type backlight device was manufactured and evaluated in the same manner as in Example 1 except that this light diffusion plate 7 was used instead of the light diffusion plate 1.
  • Average brightness is 3379cdZm 2 and brightness uniformity is 3.1.
  • the light diffusing plate in which "the first surface is closest to the light source side" is the first surface, the second surface, the third surface, Each side was arranged in the order of the 4th side.
  • a resin having an alicyclic structure as a transparent resin (manufactured by Nippon Zeon Co., Ltd., ZENOOR 1060 R, refractive index 1.53) 99.85 parts by weight, and fine particles of a crosslinked product of polysiloxane polymer as a light diffusing agent (GE Toshiba Silicone Co., Ltd., Tospearl 120) 0.1.15 parts by weight of a mixture of the composition pellets, injection mold using a mold with a predetermined prism shape As a result, a light diffusing plate 8 having an outer shape of 310 mm X 280 mm and a thickness of about 2. Omm, on which the prism shape was transferred, was produced.
  • This light diffuser had a total light transmittance of 93% and a ⁇ z of 93%.
  • a reflective sheet (product name: RF188, manufactured by Gidden Co., Ltd.) is attached to the bottom and side surfaces of a housing having an opening with an inner width of 300 mm, a depth of 200 mm, and a depth of 19 mm.
  • Eight cold-cathode tubes with a length of 3 mm and a length of 360 mm are separated from the bottom by 2.5 mm, with a center-to-center distance of 25 mm, arranged in parallel in the longitudinal direction of the opening and evenly in the depth direction, and an inverter is connected to this.
  • the light diffusing plate 8 was placed on the illumination device manufactured in this manner so that the prism row was parallel to the cold cathode tube and located on the light emitting surface side.
  • the cold cathode tube was turned on so that the tube current would be 6 mA, and a two-dimensional color distribution measuring device (made by Kokami Nortane, model name CA1500W) was used at equal intervals on the center line in the short direction.
  • the luminance at 100 points was measured, and the average luminance La and the luminance uniformity Lu were calculated according to Equation (4) and Equation (5) described in Example 1.
  • the average luminance was 3233cdZm 2 and the luminance uniformity was 1. It was three.
  • a light diffusing plate 9 was produced in the same manner as in Example 6 except that a mold having a predetermined prism shape different from that used in Example 6 was used. On one surface of the light diffusing plate 9, a prism row having the shape shown in Table 5 is formed in parallel with the long side, and the other is a flat surface (?? 7 pieces).
  • a direct backlight device was fabricated and evaluated in the same manner as in Example 6 except that this light diffusing plate 9 was used instead of the light diffusing plate 8.
  • the average luminance was 3355 cd / m 2 and the luminance uniformity was 0.9.
  • Table 8 shows the values of a, b, n, j, W, S, and Xj on each surface of the prism array of this direct type backlight device. [0101] (Example 8)
  • a light diffusing plate 10 was produced in the same manner as in Example 6 except that a mold having a predetermined prism shape different from that used in Example 6 was used. On one surface of the light diffusing plate 10, a prism row having the shape shown in Table 5 was formed in a direction forming an angle of 40 ° with the long side, and the other was a flat surface.
  • a direct type backlight device was fabricated and evaluated in the same manner as in Example 6 except that this light diffusion plate 10 was used in place of the light diffusion plate 8.
  • the average luminance was 3268 cdZm 2 and the luminance uniformity was 1.0.
  • the values of a, b, n, j, W, S, and Xj on each surface of the prism array of this direct type backlight device are shown in FIG.
  • a light diffusing plate 11 was produced in the same manner as in Example 6 except that a mold having a predetermined prism shape different from that used in Example 6 was used. On one surface of the light diffusing plate 11, a prism row having a shape shown in Table 5 was formed in parallel with the long side, and the other was a flat surface.
  • a direct backlight device was fabricated and evaluated in the same manner as in Example 6 except that this light diffusing plate 11 was used in place of the light diffusing plate 8.
  • the average luminance was 3372 cdZm 2 and the luminance uniformity was 0.7.
  • Table 8 shows the values of a, b, n, j, W, S, and Xj on each surface of the prism array of this direct type backlight device.
  • Example 6 The same procedure as in Example 6 was applied except that a mold having a predetermined prism shape with two slopes provided on one linear prism, which was different from that used in Example 6, was used to expand the light. Scatter plate 12 was produced. On one surface of the light diffusing plate 12, a prism strip having a shape shown in Table 5 was formed in parallel with the long side, and the other was a flat surface.
  • a direct backlight device was fabricated and evaluated in the same manner as in Example 6 except that this light diffusing plate 12 was used in place of the light diffusing plate 8.
  • the average luminance was 3390 cdZm 2 and the luminance uniformity was 0.6.
  • Table 8 shows the values of a, b, n, j, W, S, and Xj on each surface of the prism array of this direct type backlight device.
  • Example 3 A light diffusing plate 13 was produced in the same manner as in Example 6 except that a mold having a predetermined prism shape different from that used in Example 6 was used. On one surface of the light diffusing plate 13, a prism row having a single type of linear prism force shown in Table 6 was formed in parallel with the long side, and the other was a flat surface.
  • a direct backlight device was fabricated and evaluated in the same manner as in Example 6 except that this light diffusing plate 13 was used in place of the light diffusing plate 8.
  • the average luminance was 3279 cdZm 2 and the luminance uniformity was 2.3.
  • a light diffusing plate 14 was produced in the same manner as in Example 6 except that a mold having a predetermined prism shape different from that used in Example 6 was used. On one surface of the light diffusing plate 14, a prism row having a single type of linear prism force shown in Table 6 was formed in parallel with the long side, and the other was a flat surface.
  • a direct type backlight device was fabricated and evaluated in the same manner as in Example 6 except that this light diffusion plate 14 was used in place of the light diffusion plate 8.
  • the average luminance was 3180 cdZm 2 and the luminance uniformity was 3.7.
  • the first to fourth inclined surfaces correspond to the inclined surfaces of the first to fourth prisms, respectively. 6] Table 6

Abstract

La présente invention concerne une plaque de diffusion de lumière améliorée en termes de luminance lumineuse et d'uniformité de luminance lumineuse, ainsi qu'un dispositif de rétroéclairage direct. L'invention concerne de manière spécifique une plaque de diffusion de lumière pour diffuser la lumière provenant d'une source lumineuse, qui comprend une surface incidente à la lumière à travers laquelle la lumière en provenance de la source lumineuse pénètre et une surface d'émission de lumière à travers laquelle la lumière incidente est diffusée et émise. Cette plaque de diffusion de lumière se caractérise en ce que la surface incidente à la lumière est une surface généralement plate tandis que la surface d'émission de lumière comporte une matrice de prismes comportant une pluralité de prismes linéaires d'une forme spécifique avec une section transversale en saillie ou en retrait. L'invention concerne aussi de manière spécifique un dispositif de rétroéclairage direct caractérisé par le fait de comprendre une telle plaque de diffusion de lumière.
PCT/JP2006/321169 2005-10-28 2006-10-24 Plaque de diffusion de lumiere et dispositif de retroeclairage direct WO2007049618A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009036892A (ja) * 2007-07-31 2009-02-19 Tomoegawa Paper Co Ltd 指向性フィルムおよび指向性拡散フィルム
JP2009117194A (ja) * 2007-11-07 2009-05-28 Puratekku:Kk 照明カバー及び照明器具
WO2009078439A1 (fr) * 2007-12-18 2009-06-25 Takiron Co., Ltd. Pellicule optique et unité de rétroéclairage qui utilise celle-ci
NL1036337C2 (en) * 2007-12-25 2010-06-22 Sumitomo Chemical Co Surface light source device and liquid crystal display.
JP2010204518A (ja) * 2009-03-05 2010-09-16 Toppan Printing Co Ltd 複数の変曲点を有する単位レンズを配した光学シート
WO2013015250A1 (fr) * 2011-07-25 2013-01-31 株式会社小糸製作所 Dispositif d'éclairage de véhicule
JP2014103129A (ja) * 2014-03-11 2014-06-05 Dainippon Printing Co Ltd 導光板、面光源装置および表示装置
US9217821B2 (en) 2011-10-18 2015-12-22 Dai Nippon Printing Co., Ltd. Light guide plate, surface light source device, and display device
JP2017103148A (ja) * 2015-12-03 2017-06-08 市光工業株式会社 インナーレンズ及び車両用灯具
JP2018105929A (ja) * 2016-12-22 2018-07-05 京セラ株式会社 集光板及びそれを用いた太陽電池モジュール
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07230002A (ja) * 1994-02-17 1995-08-29 Mitsubishi Rayon Co Ltd 輝度向上透明シート
JPH095505A (ja) * 1995-06-20 1997-01-10 Dainippon Printing Co Ltd レンズシート、面光源及び表示装置
JPH0954555A (ja) * 1995-08-11 1997-02-25 Omron Corp 面光源装置、当該装置に用いる面状光学素子並びに当該装置を用いた画像表示装置、パーソナルコンピュータ、情報端末機、テレビ受像機、ビデオカメラ及びヘッドマウントディスプレイ
JPH10214035A (ja) * 1997-01-30 1998-08-11 Canon Inc バックライト装置及びこれを用いた液晶表示装置
JP2000231103A (ja) * 1999-02-09 2000-08-22 Mitsubishi Rayon Co Ltd レンズシートおよびそれを用いたバックライト、液晶表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07230002A (ja) * 1994-02-17 1995-08-29 Mitsubishi Rayon Co Ltd 輝度向上透明シート
JPH095505A (ja) * 1995-06-20 1997-01-10 Dainippon Printing Co Ltd レンズシート、面光源及び表示装置
JPH0954555A (ja) * 1995-08-11 1997-02-25 Omron Corp 面光源装置、当該装置に用いる面状光学素子並びに当該装置を用いた画像表示装置、パーソナルコンピュータ、情報端末機、テレビ受像機、ビデオカメラ及びヘッドマウントディスプレイ
JPH10214035A (ja) * 1997-01-30 1998-08-11 Canon Inc バックライト装置及びこれを用いた液晶表示装置
JP2000231103A (ja) * 1999-02-09 2000-08-22 Mitsubishi Rayon Co Ltd レンズシートおよびそれを用いたバックライト、液晶表示装置

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009036892A (ja) * 2007-07-31 2009-02-19 Tomoegawa Paper Co Ltd 指向性フィルムおよび指向性拡散フィルム
JP2009117194A (ja) * 2007-11-07 2009-05-28 Puratekku:Kk 照明カバー及び照明器具
WO2009078439A1 (fr) * 2007-12-18 2009-06-25 Takiron Co., Ltd. Pellicule optique et unité de rétroéclairage qui utilise celle-ci
NL1036337C2 (en) * 2007-12-25 2010-06-22 Sumitomo Chemical Co Surface light source device and liquid crystal display.
JP2010204518A (ja) * 2009-03-05 2010-09-16 Toppan Printing Co Ltd 複数の変曲点を有する単位レンズを配した光学シート
JP2013026146A (ja) * 2011-07-25 2013-02-04 Koito Mfg Co Ltd 車両用灯具
WO2013015250A1 (fr) * 2011-07-25 2013-01-31 株式会社小糸製作所 Dispositif d'éclairage de véhicule
US9217821B2 (en) 2011-10-18 2015-12-22 Dai Nippon Printing Co., Ltd. Light guide plate, surface light source device, and display device
JP2014103129A (ja) * 2014-03-11 2014-06-05 Dainippon Printing Co Ltd 導光板、面光源装置および表示装置
JP2017103148A (ja) * 2015-12-03 2017-06-08 市光工業株式会社 インナーレンズ及び車両用灯具
JP2018105929A (ja) * 2016-12-22 2018-07-05 京セラ株式会社 集光板及びそれを用いた太陽電池モジュール
JPWO2018198483A1 (ja) * 2017-04-27 2020-05-14 ソニー株式会社 光学部材、表示装置および照明装置
JP7245772B2 (ja) 2017-04-27 2023-03-24 ソニーグループ株式会社 光学部材、表示装置および照明装置
US20220378285A1 (en) * 2021-05-28 2022-12-01 Evident Corporation Illumination optical system for endoscope, optical adaptor and endoscope
US11871907B2 (en) * 2021-05-28 2024-01-16 Evident Corporation Illumination optical system for endoscope, optical adaptor and endoscope

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