WO2007032469A1 - 直下型バックライト装置 - Google Patents
直下型バックライト装置 Download PDFInfo
- Publication number
- WO2007032469A1 WO2007032469A1 PCT/JP2006/318351 JP2006318351W WO2007032469A1 WO 2007032469 A1 WO2007032469 A1 WO 2007032469A1 JP 2006318351 W JP2006318351 W JP 2006318351W WO 2007032469 A1 WO2007032469 A1 WO 2007032469A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light
- backlight device
- light diffusing
- type backlight
- plate
- Prior art date
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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
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
-
- G—PHYSICS
- G02—OPTICS
- 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
- 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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
Definitions
- the present invention relates to a direct type backlight device used in a display device such as a liquid crystal display device. More specifically, the present invention relates to a direct backlight device having high luminance and good luminance uniformity.
- the edge light type is a backlight device in which a cold cathode tube of a thin tube is arranged on the end face of the light guide plate, and the light incident on the end face force is repeatedly reflected in the light guide plate and emitted to the main surface of the light guide plate.
- the direct type backlight device is a backlight having a combination of a plurality of cold-cathode tubes arranged in parallel, a reflector provided on the back of the cold-cathode tube, and a light diffusing plate forming a light-emitting surface. Device.
- the direct-type backlight device can increase the number of cold-cathode tubes used, so that the light emitting surface can be easily brightened.
- the direct type backlight device has a problem that the luminance uniformity of the light emitting surface is poor.
- the periodic luminance unevenness that occurs because the luminance increases directly above the cold cathode tube is a serious problem. That is, if the brightness uniformity of the light emitting surface of the knocklight device is poor, display unevenness occurs on the display screen of the liquid crystal display.
- the direct type backlight device it is possible to improve the luminance uniformity by reducing the interval between the cold cathode tubes, but in order to do so, the number of cold cathode tubes must be increased, and the structure of the knock light is complicated. Or power consumption during lighting increases.
- the brightness uniformity can also be improved by increasing the distance between the cold-cathode tube and the light diffusing plate. In that case, however, the backlight device has become thicker, making it impossible to reduce the thickness of the liquid crystal display.
- a striped or dot-shaped light quantity correction pattern is printed on a light diffusion plate and emitted directly above the cold cathode tube.
- the reflected light from the reflector is reduced using a method that reduces the amount of emitted light and relatively increases the amount of light emitted between the cold cathode tubes (illustrated in Fig. 6 of Patent Document 1) or a wave-shaped reflector.
- Patent Document 2 proposes a technique that collects the light in a region corresponding to the middle of the cold cathode tube and the cold cathode tube.
- a light diffusing plate used for a direct type backlight device often uses a material in which a light diffusing agent is dispersed in a transparent resin.
- a pattern such as a prism shape on the surface of the light diffusing plate so as to have a diffusion effect due to the surface shape without lowering the brightness.
- Patent Document 3, 4, 5 the luminance uniformity was not improved enough by forming prismatic patterns on the surface of the light diffusion plate.
- Patent Documents 3 to 5 a prism array having a sawtooth cross section is used, but in addition to this, in order to improve the brightness enhancement effect, a polygonal cross section is used instead of a cross section sawtooth protrusion.
- a sheet having a conical protrusion has been proposed (Patent Document 6).
- the brightness uniformity cannot be improved by using the sheet having the polygonal projection.
- Patent Document 1 Japanese Patent Laid-Open No. 6-273760
- Patent Document 2 Japanese Patent Laid-Open No. 2001-174813
- Patent Document 3 JP-A-5-333333
- Patent Document 4 JP-A-8-297202
- Patent Document 5 Japanese Unexamined Patent Publication No. 2000-182418
- Patent Document 6 Japanese Patent No. 3134422
- the present invention relates to an improvement of a direct type backlight device, and effectively uses light efficiently.
- the purpose of this invention is to provide a low-profile direct-type backlight device that achieves a high level of brightness and suppresses periodic luminance unevenness on the light-emitting surface, thereby simultaneously improving luminance and luminance uniformity. It is a thing.
- a direct concave backlight device has a specific concave or convex structure on at least one main surface of the light diffusing plate.
- the unit is provided, the inclination of the inclined side surface of the structural unit, the distance between the central axes of the adjacent linear light sources, and the distance between the central axis of the linear light source and the main surface of the light diffusion plate on the linear light source side
- a direct-type backlight device with high brightness and good luminance uniformity can be obtained by arranging a light diffusion plate and a linear light source that have a specific relationship between them. Based on this knowledge, further studies were made and the present invention was completed.
- the present invention includes the following aspects.
- a direct-type backlight device comprising a reflector, a plurality of linear light sources arranged in parallel, and a light diffusing plate arranged in this order,
- the light diffusion plate is
- At least one main surface has a plurality of concave or convex structural units having three or more inclined side surfaces,
- the maximum height Rz of the main surface having the structural unit is 1, OOO / zm or less, and is orthogonal to the direction of the central axis of the linear light source in the region immediately above the region between the central axes of the adjacent linear light sources.
- the slope Xn (unit: degree, n is a natural number and is a sub-index for representing each slope side face), and there are two or more lines representing the slope side face n different from each other, and
- All of the inclinations Xn are average distances a (m and m) between the central axes of the adjacent linear light sources, and the main surface of the linear light source on the linear light source side in the central axis of the linear light source and the light diffusion plate 12.5— lO X (b / a) ⁇ Xn ⁇ 85-25 X (b /
- a reflector, a plurality of point light sources, and a light diffusing plate are arranged in this order.
- a direct backlight device
- the light diffusion plate is
- At least one main surface has a plurality of concave or convex structural units having three or more inclined side surfaces,
- the maximum height Rz of the main surface having the structural unit is 1, OOO / zm or less, and is surrounded by three adjacent point light sources and directly above the region not including other point light sources.
- the vertical cross sections of the light diffusing plate having a cutting line in a direction perpendicular to the direction connecting the centers of two of the three point light sources,
- Inclination Xn (unit: degree, n is a natural number, a sub-index for representing each inclined side surface.
- All of the inclinations Xn are the average distance a (mm) between the centers of the three adjacent point light sources, and the center of the point light sources and the main surface of the light diffusing plate on the linear light source side
- the structural unit is a convex shape, and the structural unit is formed into a prism row having a sawtooth cross section, and is V-shaped in a direction different from the ridge line direction of the prism row. It is obtained by making a cut in the shape.
- the shape of the structural unit is a pyramid or a truncated pyramid.
- the structural unit has a concave shape, and the structural unit has a V-shape in a direction different from the ridge line direction of the prism row in a prism row having a sawtooth cross section. It is obtained by transferring the convex shape of a transfer member having a convex shape obtained by making a cut.
- the shape of the structural unit is a pyramid or a truncated pyramid.
- the light diffusion plate is a resin composition containing a transparent resin and a light diffuser, and the total light transmittance of the resin composition is 60% or more and 98%. Less than It is.
- the light diffusing plate also has a power of a resin composition containing a transparent resin and a light diffusing agent, and the haze of the resin composition is 20% or more and 100% or less.
- the present invention includes the following preferred embodiments.
- the light diffusing plate is formed of a transparent resin having a water absorption rate of 0.25% or less.
- the light diffusing agent is a polystyrene polymer, a polysiloxane polymer, or a cross-linked product thereof.
- the direct type backlight device of the present invention has a high light quantity effective utilization rate, and the periodic luminance unevenness of the light emitting surface is suppressed, so that the luminance uniformity is high with thin luminance.
- FIG. 1 is a perspective view and a partially enlarged view of a direct type backlight device according to a first embodiment of the present invention.
- FIG. 2 is an example of a method for processing a metal member used for a mold in the present invention.
- FIG. 3 is a perspective view of an example of a convex structural unit having three or more inclined side surfaces arranged regularly according to the present invention.
- FIG. 4 is a top view of an example of a metal member used for a mold in the present invention.
- FIG. 5 is a top view of an example of a metal member used for a mold in the present invention.
- FIG. 6 is a top view of an example of a metal member used for a mold in the present invention.
- FIG. 8 is a perspective view schematically showing a direct type backlight device according to a second embodiment of the present invention.
- FIG. 9 is a plan view schematically showing the arrangement of a plurality of point light sources according to the first embodiment.
- FIG. 10 is a plan view schematically showing the arrangement of a plurality of point light sources according to the second embodiment.
- FIG. 11 is a plan view schematically showing the arrangement of a plurality of point light sources according to a third embodiment. Explanation of symbols
- the direct type backlight device includes a reflector, a plurality of linear light sources arranged in parallel or a plurality of point light sources arranged discretely, and a light diffusion plate arranged in this order. It will be done.
- the reflecting plate used in the present invention is not particularly limited as long as it is a plate that can reflect light.
- a white or silver colored resin board, a metal plate, etc. are mentioned.
- the color of the reflector is preferably white because of improved brightness uniformity.
- a white portion and a silver portion may be mixed.
- As the material it is preferable to use a resin for weight reduction.
- the linear light source used for this invention will not be specifically limited if it has a linear light emission part.
- the linear light source is not limited to a linear light source such as a cold cathode tube or a hot cathode tube.
- Light from a light source such as an LED is guided straight by a light guide.
- Also included are those that can be identified with a linear light emitting part, such as those that emit light from a light emitting surface.
- the cold-cathode tube or the hot-cathode tube may include a curved light-emitting portion in addition to the linear shape.
- the power of brightness uniformity is the power of color reproducibility preferred by a cold-cathode tube.
- the light from a LED is guided by a light guide to emit light from a linear light emitting surface. What was made like this is preferable.
- a plurality of linear light sources are arranged in parallel. That is, the adjacent linear light emitting portions are arranged so as to be substantially parallel. When three or more linear light emitting portions are arranged, it is preferable that they are equally spaced.
- the distance a between the central axes of adjacent linear light sources is not particularly limited.
- the force is preferably 15 mm or more and 150 mm or less, more preferably 20 mm or more and 100 mm or less.
- the distance a between the central axes of adjacent linear light sources is set to the above range.
- the distance b between the central axis of the linear light source and the main surface of the light diffusing plate closer to the linear light source takes into account the thickness of the knocklight device and the luminance uniformity.
- the force is preferably 2 mm or more and 30 mm or less, more preferably 3 mm or more and 25 mm or less.
- the distance b for each linear light source is approximately equal.
- the overall thickness of the backlight device can be reduced.
- the distance a between the central axes of adjacent linear light sources, the distance b between the central axis of the linear light sources and the surface of the light diffusion plate closer to the light source b In both cases, in the L Ln knocklight device, it is usually a constant value, but in order to obtain a luminance distribution that resembles a bright CRT at the center of the screen, a and b
- Ln may be set to / J ⁇ .
- the point light source used in the present invention has a point light emitting part.
- a typical example of a point light source is a light emitting diode (LED).
- Some light emitting diodes emit various colors such as white, red (R), green (G), and blue (B).
- a point light source (1) using only a white LED, and (2) RGB three primary colors are combined. And (3) a combination of three primary colors of RGB with an intermediate color or white can be appropriately selected in consideration of the color balance.
- the point light source includes a light source having an equivalent diameter of about several millimeters to several tens of millimeters.
- the point light sources are discretely arranged.
- the arrangement of the point light source is not particularly limited.
- the point light sources are arranged in a straight line; as shown in Fig. 9, they are arranged at predetermined intervals along the vertical and horizontal directions of the direct type backlight device;
- the point light sources A1 to A4 in FIG. 9 are removed, that is, the point light sources 12 are arranged at each of the four vertices of the rectangle, and further, a point is set at the intersection of the diagonal lines of the rectangle.
- a shape in which regular hexagons are continuously formed a point light source 12 is arranged at each vertex of a two-cam structure, and the like. It is done.
- the interval between the point light sources may be uniform at all locations or may be partially changed.
- the case of partial change is, for example, the case where the interval between the point light sources is narrowed at the center of the direct type backlight device.
- the center of the point light source regarded as one is identified based on the centers of the LEDs arranged close to each other, and Based on this, the distance a between adjacent point light sources is obtained.
- the distance a for each color is obtained for each color LED in accordance with the above definition, and the average value is determined by the present invention. Let the distance a be between the adjacent point light sources.
- the distance a between the centers of adjacent point light sources is not particularly limited
- the distance b between the center of the point light source and the main surface of the light diffusing plate closer to the point light source may be designed in consideration of the thickness of the backlight device and the luminance uniformity. 2m
- the distance is not less than m and not more than 100 mm. It is more preferable that the distance is not less than 3 mm and not more than 80 mm.
- the luminance unevenness can be reduced and the heat generated by the LED can be reduced.
- a and b are made smaller in the vicinity of the center of the backlight device than in the periphery.
- Pn Pn may be set.
- the light diffusing plate used in the present invention is a plate for disturbing the traveling direction of incident light so that light of uniform luminance can be emitted from the main surface (plate surface).
- the light diffusion plate has a light incident surface and a light emission surface (in the present invention, these may be referred to as main surfaces, respectively).
- Light from a linear light source or a point light source is incident on a light incident surface located on the side closer to the light source.
- the light incident on the light incident surface of the light diffusing plate is diversified by a plurality of structural units regularly provided in the light diffusing plate or at least one of the light incident surface and the light emitting surface. Diffuses in the direction of the light, and the light source surface force on the far side is emitted.
- the light diffusing plate used in the present invention has three or more inclined sides on at least one main surface thereof. It has a concave or convex structural unit with a surface.
- the structural unit may be V on the entire main surface, or only on the optically effective surface of the main surface! /, Or! /.
- the structural unit may be formed on both main surfaces of the light diffusing plate, but it is more improved if it is formed only on the main surface (light emitting surface) far from the linear light source. Preferred to let ⁇ .
- the light incident on the incident surface of the light diffusing plate is refracted in a specific direction by this structural unit and is diffusely irradiated from the light emitting surface.
- the structural unit is convex or concave having three or more inclined side surfaces.
- the structural unit is preferably a convex shape or a concave shape that narrows the light emission direction.
- the specific shape of the structural unit is a pyramid-shaped convex shape or a concave shape obtained by transferring it, a truncated pyramid-shaped convex shape or a concave shape obtained by transferring it, a prismatic lenticular lens row, or a prism row having a sawtooth cross section. Examples include a convex shape with V-shaped cuts in a direction different from the ridge line direction, or a concave shape obtained by transferring them.
- Examples of the pyramid include a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid, a hexagonal pyramid, and the pyramid includes a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid, a hexagonal pyramid, and the like.
- the convex shape with a V-shaped notch in the direction of the ridge line in the prism row having a sawtooth cross section, or the concave shape obtained by transferring it is the formation of the structural unit. Since it is easy, it is preferably used.
- the section sawtooth prism row means that a section cut in a direction perpendicular to the longitudinal direction has a shape in which triangular or trapezoidal protrusions are connected.
- the sawtooth prisms in section may have a V-shaped groove formed by connecting the bottoms of the triangular protrusions, or a horizontal part may exist between the bottoms of the triangular protrusions. It is preferable to connect the skirts of the triangles to form a V-shaped groove because light can be diffused efficiently.
- the shape of the triangular protrusion is not particularly limited, but is preferably an isosceles triangle in order to maximize the luminance in the front direction of the liquid crystal display.
- the structural unit has only a concave shape or only a convex shape because it is easy to manufacture a mold for molding.
- the structural unit may be one type of convex or concave force, or may be a combination of multiple types of convex or concave forces.
- a structural unit or a group of structural units may be periodically and repeatedly arranged. It is preferable for improving the luminance uniformity.
- the period is more preferably 20 ⁇ m or more and 700 ⁇ m or less, and further preferably 40 ⁇ m or more and 400 ⁇ m or less. If the period of the structural unit is less than the above range, it may be difficult to form the structural unit or the light diffusion effect may be reduced. If the period exceeds the above range, the light diffusion becomes rough, and there is a risk of uneven brightness.
- the maximum height Rz of the main surface having the structural unit is 1,000 m or less.
- the maximum height Rz of the main surface with the structural unit must be 2 m or more and 1000 m or less in order to further improve the balance between the luminance and luminance uniformity of the backlight device and make the processing of the light diffusion plate easier. It is most preferably 4 ⁇ m or more and 800 ⁇ m or less, and most preferably 8 ⁇ m or more and 500 ⁇ m or less.
- the maximum height Rz of the main surface having the structural unit is determined using an ultra-deep shape measuring microscope in accordance with JIS B0601.
- the inclined side surface of the structural unit of the light diffusing plate may be a smooth surface! /, Or a part or the entire surface of the inclined side surface may be a rough surface! / ⁇ . Further, all the inclined side surfaces constituting the structural unit may be rough surfaces, or only some of the inclined side surfaces may be rough surfaces. If the inclined side surface is a rough surface having an appropriate roughness, the light emission direction can be varied within an appropriate range.
- the light diffusing plate with the inclined side surface of the structural unit roughened has an arithmetic average height Ra force preferably 20 ° when measured 20 m perpendicular to the side parallel to the main surface of the light diffusing plate.
- Raising the angle of the inclined side surface to 0.0 ⁇ m or more can make the light emission direction more diverse, and making it 3 ⁇ m or less should not make the light emission direction too diverse. Can do.
- the arithmetic average height Ra is obtained using an ultra-deep shape measuring microscope in accordance with JIS B0601 on the inclined side surface of the structural unit.
- the light diffusion plate used in the present invention is particularly limited depending on the material constituting the light diffusion plate and the manufacturing method. Not.
- the material constituting the light diffusing plate is not particularly limited, but glass, a mixture of two or more types of resin that are difficult to mix, a resin composition in which a light diffusing agent is dispersed in a transparent resin, one type of transparent resin, etc. Is usually used.
- a resin is preferable because of its light weight and easy molding.
- a resin composition in which a light diffusing agent is dispersed in a transparent resin is preferable from the viewpoint of easy adjustment of total light transmittance and haze.
- the part of the concave or convex structural unit may be formed of a different material from the base of the light diffusing plate, but it is the same material, in particular a resin composition in which a light diffusing agent is dispersed in a transparent resin. It is preferable that the entire light diffusion plate can be adjusted to have the same total light transmittance and haze, and the direction of light emitted from the light diffusion plate can be further diversified.
- the present invention is 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.
- the transparent resin include polyethylene, propylene ethylene copolymer, polypropylene, polystyrene, a copolymer of an aromatic vinyl monomer and a (meth) acrylic acid alkyl ester having a lower alkyl group, polyethylene
- examples thereof include terephthalate, terephthalic acid monoethylene glycol-cyclohexane dimethanol copolymer, polycarbonate, acrylic resin, methallyl resin, and resin having an alicyclic structure.
- a resin having an alicyclic structure is preferable in that it has good fluidity and can efficiently produce a large light diffusing plate.
- a compound prepared by mixing rosin having an alicyclic structure and a light diffusing agent has both high permeability and high diffusibility required for a light diffusing plate, and has good chromaticity, so that it can be suitably used.
- (Meth) acrylic acid is acrylic acid and methacrylic 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.
- Examples of the alicyclic structure include a saturated cyclic hydrocarbon (cycloalkane) structure and an unsaturated cyclic hydrocarbon (cycloalkene, cycloalkyne) structure. From the viewpoints of mechanical strength and heat resistance, the cycloalkane structure is most preferable among the cycloalkane structures.
- the number of carbon atoms constituting the alicyclic structure is not particularly limited, but is usually 4 to 30, preferably 5 to 20, more preferably 5 to 15 when the mechanical strength, The properties of heat resistance and formability of the light diffusing plate are 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 according to 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 structure having an alicyclic structure is appropriately selected according to the purpose of use.
- the coconut resin having an alicyclic structure include (1) a ring-opening polymer of a norbornene-based monomer and other monomers capable of ring-opening copolymerization with the norbornene-based 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.
- the light diffusing agent used in the light diffusion plate is a particle having a property of diffusing light.
- the light diffusing agent includes an inorganic light diffusing agent and an organic light diffusing agent.
- inorganic substances constituting the inorganic light diffusing agent include silica, aluminum hydroxide, aluminum oxide, titanium oxide, zinc oxide, barium sulfate, magnesium silicate, and mixtures thereof.
- Organic substances that constitute the organic light diffusing agent include acrylic resin, acrylonitrile, polyuretan, polychlorinated butyl, polystyrene resin, polyacrylonitrile, polyamide, polysiloxane resin, melamine resin, benzoguanamine resin. Examples include fats. Among these, the fine particles that have polystyrene-based resin, polysiloxane-based resin, or their cross-linked power
- High dispersibility, high heat resistance, and no coloring (yellowing) at the time of molding can be used particularly preferably.
- 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. Among them, a spherical shape capable of making the light diffusion direction isotropic is preferable.
- the light diffusing agent is contained in the transparent resin in a macroscopically uniform and spaced apart manner.
- the content of the light diffusing agent in the resin composition in which the light diffusing agent is dispersed in the transparent resin can be appropriately selected according to the thickness of the light diffusing plate, the light source interval, etc., which are not particularly limited. However, it is usually preferable to adjust the content of the light diffusing agent so that the total light transmittance of the resin composition is 60% or more and 98% or less. It is more preferable to adjust the content of the light diffusing agent. It is also preferable to adjust the content of the light diffusing agent so that the haze is 20% or more and 100% or less. It is more preferable to adjust the content of the light diffusing agent so that the haze is 25% or more and 100% or less. preferable.
- the luminance can be further improved by setting the total light transmittance to 60% or more and the haze to 100% or less, and the total light transmittance is reduced to 98% or less.
- the brightness uniformity can be further improved by setting the level to 20% or more.
- the thickness of the light diffusion plate is not particularly limited, but is preferably 0.4 mm to 5 mm, and more preferably 0.8 mm to 4 mm. If the thickness is less than 0.4 mm, it will be necessary to devise measures to suppress deflection due to its own weight, such as forming a large number of columns in the backlight device, and the structure of the knocklight device will be complicated. If the thickness exceeds 5 mm, molding becomes difficult.
- the method of forming the structural unit on the surface of the light diffusing plate is not particularly limited.
- the method may be a method of forming the structural unit on the surface of the plate-shaped light diffusing plate. It may be a method of forming a structural unit at the same time as formation.
- the method of forming the structural unit simultaneously with the formation of the light diffusion plate base includes a casting method using a casting mold that can form the shape of the desired structural unit, and an injection molding using a mold that can form the shape of the desired structural unit. Law.
- the injection molding method and the casting method can form the structural unit simultaneously with the formation of the light diffusing plate base, and thus the process is simple.
- the casting method can be performed in a mold capable of forming a plate, or can be performed continuously while pouring the raw material between two continuous belts and driving the belt.
- the injection molding method in order to increase the shape transfer rate, it is preferable to raise the mold temperature when injecting the resin and quench the mold during cooling. It is also preferable to apply an injection compression molding method in which the mold is expanded when pouring the resin and then the mold is closed.
- the embossing method can make the shape transfer rate uniform in the plane.
- the plate obtained by extrusion molding can be sent to the embossing process as it is, and can be continuously molded.
- the mold shape transfer method using photocured resin or thermosetting resin can increase the transfer rate of the shape.
- photocured resin or thermosetting resin is cured to the extent that it does not flow before shape transfer, and is cured by irradiating light or applying heat immediately after shape transfer.
- the mold shape transfer method can be applied directly to a flat plate made by injection molding, extrusion molding or casting. However, this mold shape transfer method is applied to thin film to form a desired shape.
- the method of laminating the film on a flat plate prepared by an injection molding method, an extrusion molding method or a casting method is preferable because a higher shape transfer rate can be obtained.
- a mold used in a mold shape transfer method, an embossing method, a casting method, or an injection molding method using a photo-curing resin or a thermosetting resin is a cutting process capable of forming a fine shape. It can be obtained by kayaking.
- the cutting process for obtaining the mold can be described in detail by taking the following process as an example.
- a plate-like member 4 as shown in FIG. 2 (a) is prepared.
- Tool 5-2 may be capable of forming a slope with the same angle as tool 5-1 or may be capable of forming a different angle.
- the same cutting process may be performed on the metal roll, or the stamper may be obtained by the above-described cutting process, and the stamper may be attached to the metal roll.
- the direct type backlight device of the present invention when a linear light source is used, it is orthogonal to the central axis direction of the linear light source in the region immediately above the region between the central axes of adjacent linear light sources.
- the inclined side surfaces n having different inclinations Xn (unit: degree, n is a natural number and a sub-index for representing each inclined side surface)
- Xn the average distance a (mm) between the central axes of the adjacent linear light sources and the central axis of the linear light sources and the light diffusion plate.
- a portion having the relationship L2 of X (b / a) is included.
- inclination Xn single The degree: n is a natural number and is a sub-index for representing each inclined side surface.
- n is a natural number and is a sub-index for representing each inclined side surface.
- the direct type backlight device of the present invention there are two or more inclinations of the line representing the inclined side surface n.
- the difference between the slopes is not particularly limited, but usually the angle is more than 2 degrees apart.
- the ratio of the portion having the relationship L1, preferably the relationship L2, in the region immediately above the region between the central axes of the adjacent linear light sources is preferably 50% or more, more preferably 60% or more, particularly preferably. Is over 70%.
- the proportion of the portion having the above relationship Pl, preferably the relationship P2, in the region directly above the region having the width of the point light source between two adjacent point light sources at the shortest distance is preferably 50% or more More preferably, it is 60% or more, particularly preferably 70% or more.
- the method of including the portion having the relationship as described above is not particularly limited !, but, for example, a method of forming a concave or convex structural unit with an asymmetric polygonal pyramid, rules of the structural unit
- the general arrangement direction and the direction of the central axis of the linear light source or the direction connecting the centers of two point light sources adjacent to each other at the shortest distance are arranged so that they intersect at an angle that is neither perpendicular nor parallel. There are methods. The latter method is suitable for the present invention.
- the inclination Xn is observed on the main surface having the structural unit, directly observed using an ultra-deep shape measuring microscope, and a line perpendicular to the normal of the light diffusion plate and a line representing the inclined side surface n. It is a subordinate angle of the intersection.
- a line perpendicular to the normal of the light diffusing plate is represented by a one-dot chain line
- a line representing an inclined side surface is a solid line drawn above the one-dot chain line.
- the left slope side (upward solid line) of the leftmost triangle has an X2 slope
- the right slope side (lower left solid line) has an XI slope.
- the solid line indicating the second or third polygonal top surface from the left is also a line representing the inclined side surface.
- the slope of this solid line is XI.
- the inclined side surface of the structural unit includes a curved surface that is formed by only one plane. When the inclined side surface is a curved surface, the slope Xn is an average value of the tangent slopes of the curved surface.
- a diffusion sheet and a Z or prism sheet may be installed on the side farther from the light source of the light diffusion plate as an optical member for further improving the luminance and luminance uniformity.
- a reflective polarizer may be installed on the side of the optical member that is closer to the light source.
- a reflective polarizer using the difference in reflectance of the polarization component depending on the Brewster angle for example, the one described in JP-A-6-508449
- Reflective polarizer using selective reflection characteristics by liquid crystal specifically, a laminate of a film made of cholesteric liquid crystal and a 1Z4 wavelength plate (for example, those described in JP-A-3-45906);
- Reflective polarizer with a metal linear pattern for example, the one described in JP-A-2-308106
- at least two polymer films are laminated and refracted Reflective polarizer using reflectance anisotropy due to refractive index anisotropy (for example, those described in Japanese Patent Publication No.
- FIG. 1 (a) is a schematic perspective view showing an example of a direct type backlight device according to the first embodiment of the present invention.
- the direct type backlight device according to the present embodiment includes a plurality of linear light sources 2 arranged in parallel, a reflector 3 that reflects light from the linear light sources 2, and a light incident surface.
- a light diffusing plate 1 for diffusing and irradiating light from a light emitting surface which is the surface opposite to the above.
- FIG. 1 (b) shows an example of the light diffusing plate 1 in which convex structural units (square pyramids) are regularly arranged on the light emitting surface.
- the convex structural unit of the light diffusing plate used in this embodiment has three or more inclined side surfaces (square pyramid in FIG. 1).
- the alternate long and short dash line indicating the direction perpendicular to the direction of the central axis of the linear light source and the arrangement direction of the structural units of the light diffusing plate (in FIG. 1, the base of the square pyramid) are neither perpendicular nor parallel. ing.
- FIG. 1 (c) shows the reflector 3, the linear light source shown in FIG. 1 (a), in which the direction orthogonal to the longitudinal direction of the linear light source is a cutting line (dashed line in the figure).
- FIG. 3 is a view showing a vertical cross section of a light diffusing plate.
- the lower square in Fig. 1 (c) is the reflector, the upper two circles are the linear light sources, and the part where the polygons are aligned is the light diffuser.
- the area of the light diffusing plate, just above the area between the two circles, contains four polygons (structural units).
- the inclined side surface of the convex structural unit is formed by a single plane!
- the slope Xn of the line representing each inclined side surface n of the convex structural unit Xn Is the slope n of each convex structural unit n
- the lowermost part of the concave portion formed between the line representing the convexity and the convex structural unit is represented by an inferior angle formed by the connecting line.
- the average slope of the other slope sides is the same, so they are collectively shown as XI for the sake of simplicity. Two types of slopes XI and X2 are shown.
- all of the inclinations Xn are the average distance a (mm) between the central axes of adjacent linear light sources, and the linear light source in the central axis of the linear light source and the light diffusion plate.
- the maximum height Rz of the light exit surface of the light diffusing plate is less than 1,000 m.
- FIG. 8 is a perspective view schematically showing a direct type backlight device according to the second embodiment.
- the direct type backlight device of the second embodiment includes a plurality of point light sources 12 and the light diffusing plate 1.
- the direct type backlight device according to the second embodiment has a configuration in which a plurality of linear light sources 2 arranged in parallel are replaced with a plurality of point light sources 12 arranged in a discrete manner in FIG.
- the direct-type backlight device of the second embodiment is different from the first embodiment in that the light source is a point light source and the preferred range of the average inclination Xn.
- all of the inclinations Xn (unit: degree, n is a natural number and a sub-index for representing each inclined side surface) are the distances a (mm) between the point light sources adjacent to each other.
- the minimum distance between the center of the point light source and the principal surface of the light diffuser on the side of the point light source is b.
- the maximum height Rz of the light exit surface of the light diffusing plate is less than 1, OOO / zm.
- a resin having an alicyclic structure [Nippon Zeon Co., Ltd., ZEONOR 1060R, water absorption: 0.01%] 99.9 parts, and a polysiloxane heavy polymer having an average particle size of 2 m as a light diffusing agent 0.1 part of fine particles having a cross-linked product strength were mixed, kneaded with a two-line extruder, extruded into a strand, and cut with a pelletizer to produce a light diffusion plate pellet 1. From this light diffusing plate pellet, a test plate having a smooth thickness of 2 mm and 1 OO mm ⁇ 50 mm on both sides was formed using an injection molding machine (clamping force 1000 kN).
- the total light transmittance and haze of this test plate were measured using an integrating sphere color difference turbidimeter according to JIS K7361-l ⁇ JIS K7136.
- the total light transmittance was 94% and the haze was 89%.
- a pellet 2 for a light diffusing plate was produced in the same manner as in Production Example 1 except that the fine particles of oxalic resin having a cycloaliphatic structure and a crosslinked product of a polysiloxane polymer and 99.7 parts and 0.3 parts, respectively, were used.
- This light diffusion plate pellet had a total light transmittance of 85% and a haze of 99%.
- 387mm x 308mm, 2mm thick stainless steel SUS430 is nickel-phosphorous electroless plating with a thickness of 100 ⁇ m, and a nickel-phosphorus electroless plating surface with a 90 ° apex diamond cutting tool.
- stamper 1 was obtained by cutting into a shape.
- the obtained stamper 1 has a square shape with a bottom of 70 ⁇ m on one side and a square pyramid with a height of 35 ⁇ m, with one side inclined 30 degrees from the long side of the stamper and a convex shape that is repeated periodically. Had.
- 100mm thick nickel-phosphorus electroless plating is applied to the entire surface of stainless steel SUS430 (hereinafter sometimes referred to as "metal member") with dimensions of 387mm x 308mm and thickness of 2mm.
- metal member stainless steel SUS430
- the projections of a 90 ° section sawtooth prism array were obtained by cutting.
- a cross-sectional sawtooth prism array having a width of 70 m, a height of 29.
- This metal member had a shape in which V-shaped cuts with a depth of 29.4 m were continuously inserted into a sawtooth prism array having a cross section of 90 m at a pitch angle of 70 m. Further, on the nickel phosphorous electroless plating surface of the metal member having the above-mentioned shape, nickel is formed to a thickness of 500 m by electroplating using a nickel sulfamate aqueous solution and peeled off from the electroless plating surface.
- a stamper 2 having a concave shape as shown in FIG.
- a 100m-thick nickel-phosphorous electroless plating is applied to the entire surface of stainless steel SUS430 (hereinafter sometimes referred to as "metal member") with dimensions of 387mm x 308mm and thickness of 2mm.
- metal member stainless steel SUS430
- metal member with dimensions of 387mm x 308mm and thickness of 2mm.
- a cutting tool with a width of 70 ⁇ , height of 35 ⁇ , pitch and apex angle of 90 degrees in a direction inclined by 30 degrees with respect to the 387 mm (long) side on the nickel-phosphorous electroless plating surface
- the projections of the sawtooth prism array in cross section were obtained by cutting.
- a V-shaped notch with a width of 70 m, a height of 35 / ⁇ ⁇ , a pitch of 140 m, and an apex angle of 90 degrees is aligned with the prism row and the lowest point. Cutting was performed in such a way.
- This metal member has a rectangular shape with a bottom force of 70 m on one side and a height of 140 m on the other side, and a shape with a side with an average inclination of 45 degrees when observed in a direction perpendicular to each side of the rectangle. It had a repeated shape.
- nickel is formed to a thickness of 500 m on the nickel-phosphorus electroless plating surface of the metal member having the above-mentioned shape by using a nickel sulfamate aqueous solution and peeled off from the electroless plating surface.
- a stamper 3 having a concave shape as shown in FIG. 5 was obtained.
- 387mm x 308mm, 2mm thick stainless steel SUS430 is plated with nickel phosphorous electroless plating with a thickness of 100 ⁇ m, using a diamond cutting tool with apex angle of 60 degrees
- a sawtooth prism with a cross-section of width m, height 61 ⁇ m, pitch m, apex angle 60 degrees in a direction inclined 34 degrees with respect to the 387 mm (long) side The row 1 protrusions were obtained by cutting.
- the width was 70 / ⁇ ⁇
- the height was 61 ⁇ m
- the pitch was 70 m
- the apex was tilted 61 degrees with respect to the 387 mm (long) side.
- Cutting was performed so that a sawtooth prism row 2 having a cross section of 60 degrees was formed so that the apex coincided with the prism row 1.
- the width is 70 / ⁇ ⁇
- the height is 61 ⁇ m
- the pitch is m
- a stamper 4 was obtained by cutting a 60-degree section sawtooth prism row so that the prism rows 1 and 2 were aligned with the lowest point.
- the obtained stamper 4 had a shape as shown in FIG. 6 in which the bottom surface was triangular and the shape having a height of 61 ⁇ m was periodically repeated.
- 387mm x 308mm, 2mm thick stainless steel SUS430 is nickel-phosphorous electroless plating with a thickness of 100 ⁇ m, and a nickel-phosphorus electroless plating surface with a 90 ° apex diamond cutting tool.
- a protrusion of a section sawtooth prism array having a width of 70 ⁇ m, a height of 61 ⁇ m, a pitch of 70 ⁇ m, and an apex angle of 60 degrees was cut in parallel to the 387 mm (long) side. Obtained by processing.
- a sawtooth prism row having a cross section of 70 / ⁇ ⁇ in width, 35 / zm in height (the depth is the same value), 70 / ⁇ ⁇ in pitch, and 90 degrees in apex angle. Cutting was performed so that the apex of the prism row coincided with the apex.
- This metal member has a shape in which a V-shaped apex having a depth of 35 m is continuously inserted in a sawtooth prism array having a cross section of a pitch of 70 m and an apex angle of 60 degrees.
- a nickel-sulfuric acid aqueous solution is used to form a -kell to a thickness of 500 m and then peeled off from the electroless plating surface.
- a stamper 5 having a concave shape was obtained.
- 387 mm x 308 mm, 2 mm thick stainless steel 100 ⁇ m thick nickel-phosphorus electroless plating is applied to the entire surface of SUS430, using a diamond cutting tool with apex angle of 150 degrees and apex angle of 100 degrees. Parallel to the length of 387mm (long) on the electroless plating surface of phosphorus By alternately cutting V-shaped grooves with width 70 / zm, depth 9.4 / ⁇ ⁇ , base angle 150 degrees, width 22., depth 9., base angle 100 degrees in the direction Obtained.
- a V-shaped groove with a width of 70 m, a pitch of 70 m, and a base angle of 60 degrees in a direction inclined by 35 degrees with respect to the 387 mm (long) side is aligned with the prism row and the lowest point.
- a stamper 6 was obtained by cutting into shapes. The obtained stamper 6 had a parallelogram shape with a bottom of 70 m on one side, and a convex shape as shown in FIG. 7 in which one side was periodically inclined with an inclination of 30 degrees from the long side of the stamper. .
- 387mm x 308mm 2mm thick stainless steel 100mm thick nickel-phosphorus electroless plating is applied to the entire surface of SUS430, and a diamond cutting tool with apex angle of 170 degrees is used.
- a cross-sectional saw-toothed prism having a width of 70 / ⁇ ⁇ , a height of 3. l ⁇ m, a pitch of 70 m, and an apex angle of 170 degrees The protrusion was cut.
- stamper 7 was obtained by cutting to shape as follows. The obtained stamper 7 has a square shape with a bottom of 70 m on one side and a square pyramid with a height of 3.1 ⁇ m. It was.
- 387mm x 308mm, 2mm thick stainless steel 100mm thick nickel-phosphorus electroless plating is applied to the entire surface of SUS430, and a diamond cutting tool with an apex angle of 110 degrees is applied to the nickel phosphorus electroless plating surface.
- the protrusion of a sawtooth prism row with a section of 80m in width, 28.O ⁇ m in height, pitch 80 / ⁇ ⁇ , apex angle 110 degrees is cut. did.
- the stamper 7 is cut by forming a sawtooth prism row having a cross section of height 28.
- the obtained stamper 8 had a convex shape in which a rectangular pyramid having a bottom surface of 80 ⁇ m and 66.8 ⁇ m and a height of 28. O / zm was periodically repeated.
- Rinmetsuki Li down content 10 weight 0/0
- a prism row is formed on the entire surface with a width of 70 m, a height of 35 m and a pitch of 70 m in a direction inclined by 30 ° with respect to the roll length direction.
- prism rows were formed on the entire surface with a width of 70 ⁇ m, a height of 35 ⁇ m, and a pitch of 70 ⁇ m to obtain a forming roll having a convex shape.
- the surface of a 237 mm x 315 mm x 100 mm stainless steel block was coated with nickel monophosphorus (phosphorus content 10% by weight) at a thickness of 100 m.
- nickel monophosphorus phosphorus content 10% by weight
- a prism row is formed on the entire surface with a width of 70 ⁇ m, a height of 35 ⁇ m, and a pitch of 70 ⁇ m in a direction inclined by 30 ° with respect to a side of 315 mm in length.
- the prism is 70 ⁇ m wide, 35 ⁇ m high, and 70 ⁇ m pitch.
- a strip was formed on the entire surface to obtain a mold member having a convex shape.
- a reflective sheet (made by Gidden Co., Ltd., RF188) is attached to the inside of a milky white plastic case with an inner dimension of 305mm, depth of 227mm, and depth of 17mm.
- 8 cold cathode fluorescent tubes with a diameter of 3 mm and a length of 360 mm are arranged so that the distance a between the central axes of the cold cathode fluorescent tubes is 24.5 mm, and the vicinity of the electrodes is made of silicone sealant.
- the distance b between the cold cathode tube central axis and the cold-cathode tube side of the light diffusing plate is 13.5 mm, so the values of a and b are the same as above.
- a mold having the stamper 1 obtained in Production Example 2 was prepared, and using this and the light diffusion plate pellet 1 obtained in Production Example 1, an injection molding machine (clamping force 4 , 410kN), a light diffuser plate with a concave surface shape to which a quadrangular pyramid was transferred, a thickness of 2mm, and 237mm x 315mm was molded at a cylinder temperature of 280 ° C and a mold temperature of 85 ° C.
- an injection molding machine clamping force 4 , 410kN
- a light diffuser plate with a concave surface shape to which a quadrangular pyramid was transferred, a thickness of 2mm, and 237mm x 315mm was molded at a cylinder temperature of 280 ° C and a mold temperature of 85 ° C.
- the angle of each inclination was XI force 41 degrees, X2 force ⁇ 27 degrees, the maximum height Rz was 34.3 m, and the surface roughness Ra was 0.005 ⁇ m.
- the light diffusing plate was placed on a plastic case with a cold cathode tube attached so that the concave structural unit was on the opposite side of the cold cathode tube (opposite light source position). Furthermore, a prism sheet (Thick-RBEF, manufactured by Sumitomo 3EM Co., Ltd.) was installed so that the longitudinal direction of the prism row of the prism sheet was parallel to the cold cathode tube and the light diffusion plate force was on the far side. On top of that, a reflective polarizer (DBEF-D manufactured by Sumitomo 3EM Co., Ltd.) using double bending was installed, and a polarizing plate was attached to create a direct type backlight device.
- DBEF-D manufactured by Sumitomo 3EM Co., Ltd.
- the cold cathode tube was turned on by applying a tube current of 5 mA to the created direct type backlight device, and 100 points were equally spaced on the central axis in the short direction using a two-dimensional color distribution measuring device.
- the luminance in the front direction was measured, and the luminance average value La and luminance unevenness Lu were obtained according to the following equations 2 and 3.
- the average luminance value is 4,401 cd / m 2 and the uneven luminance is 0.76. It was.
- the luminance unevenness is an index indicating the uniformity of the luminance.
- the numerical value becomes large.
- a direct type backlight device was created and evaluated in the same manner as in Example 1 except that a diffusion sheet (188GM2 manufactured by Kimoto Co., Ltd.) was used instead of the prism sheet, and the tube current was changed to 5.5 mA. .
- the average brightness was 4,521 cdZm 2 and the uneven brightness was 0.91.
- the direct backlight is the same as in Example 1 except that the member on the light diffusion plate is a side force diffusion sheet, prism sheet, diffusion sheet, polarizing plate close to the light diffusion plate and the tube current is 7 mA.
- a device was created and evaluated. The average brightness was 4,413 cdZm 2 and the uneven brightness was 0.89.
- Example 2 Create a direct type backlight device in the same manner as in Example 1 except that the member on the light diffusion plate is a diffusion sheet, diffusion sheet, polarizing plate from the side close to the light diffusion plate, and the tube current is set to 7 mA.
- the evaluation was performed.
- the average luminance was 4,291 cdZm 2 and the luminance unevenness was 0.99.
- Example 6 Using the light diffusing plate manufactured by using the mold with the stamper 2 obtained in Production Example 3, the members on the light diffusing plate are used from the side close to the light diffusing plate using the diffusion sheet and birefringence.
- a direct-type backlight device was prepared and evaluated in the same manner as in Example 1 except that a reflective polarizer and a polarizing plate were used and the tube current was 5.5 mA.
- the resulting light diffusion plate had two types of inclinations on the side of the convex structure unit. The inclination angles were 41 degrees for XI, 23 degrees for X2, and a maximum height Rz of 34.3 ⁇ m. The average brightness is 4,560 cd / m 2 , and the uneven brightness is 0.87. [0098] Example 6
- the members on the light diffusing plate are used from the side close to the light diffusing plate using the diffusion sheet and birefringence.
- a direct-type backlight device was prepared and evaluated in the same manner as in Example 1 except that a reflective polarizer and a polarizing plate were used and the tube current was 5.5 mA.
- the resulting light diffusion plate had two types of slopes on the side of the convex structure unit. The angles of each tilt were 41 degrees for XI, 27 degrees for X2, and the maximum height Rz was 34 .: L m.
- the average luminance was 4,631 cd / m 2 and the luminance unevenness was 0.98.
- the member on the light diffusing plate is used from the side close to the light diffusing plate using the diffusion sheet and birefringence.
- a direct-type backlight device was prepared and evaluated in the same manner as in Example 1 except that a reflective polarizer and a polarizing plate were used and the tube current was 5.5 mA.
- the average luminance value was 4,512 cd / m 2 and the luminance unevenness was 0.77.
- the distance a between the central axes of the CCFLs is 40mm, and 6 pieces are used to expand the light on the light diffusion plate.
- a direct-type die back was used in the same manner as in Example 1 except that the light diffusing plate produced using the die attached with the stamper 5 obtained in Production Example 6 was used and the convex structural unit was on the cold cathode tube side.
- a crite device was created and evaluated. There are two types of inclination of the side of the convex structure unit of the obtained light diffuser, and the angles of each inclination are 60 degrees for XI, 27 degrees for X2, and the maximum height Rz is 34.1. / zm. Further, the average luminance value was 4,313 cd / m 2 and the luminance unevenness was 0.72.
- a light diffusing plate was formed in the same manner as in Example 1, and then a direct type backlight device was created. The evaluation was performed.
- the obtained light diffusion plate had two types of inclination of the side surface of the concave structural unit. The angles of inclination were 4 degrees for XI, 3 degrees for X2, and the maximum height Rz was 3 m.
- the average brightness was 4,693cd / m 2 and the brightness uniformity was 8.48.
- the light diffusing plate was molded in the same manner as in Example 2, and then the direct type backlight device was created. The evaluation was performed.
- the average brightness is 4,467 cd / m 2 and the average brightness is 2.74.
- a direct type backlight device was prepared and evaluated in the same manner as in Example 3 except that a light diffusing plate manufactured using a mold to which the stamper 7 of Production Example 8 was attached was used.
- the average brightness was 4,416 cd / m 2 and the brightness uniformity was 2.14.
- a light diffusing plate was formed in the same manner as in Example 4 except that a light diffusing plate manufactured using a mold attached with the stamper 7 of Production Example 8 was used, and then a direct type backlight device was created. The evaluation was performed. The average brightness is 4,302cd / m 2 and the average brightness is 2.21.
- o indicates that the leftmost optical member in the table was used. One indicates that it was not used. When a member name is described, it indicates that the optical member in the leftmost column has been replaced with the member described.
- a 0.5mm aluminum plate is laid on the bottom of a milky white plastic case with an inner width of 305mm, a depth of 227mm, and a depth of 16mm, and a reflective sheet (manufactured by Gidden Co., Ltd., RF188) is applied on top of it to reflect A board was used.
- white chip type LEDs (Nichia Chemical Co., Ltd. NCCW002S: Size: 7.2X11.2X4.7 mm), which is a point light source, are arranged at the bottom of the reflector plate in a uniform arrangement with a center and height of 30 mm (Fig. 8) and wired so that a direct current can be supplied to the electrode section.
- D Distance between centers a is 36.2 mm
- distance between LED center and LED side of light diffuser b is 13. 1
- the preferable range of the slope Xn (degree) was 8.5 ⁇ Xn ⁇ 74.6. Then, the same light diffusing plate, diffusing sheet, prism sheet, and reflective polarizer using birefringence as in Example 8 were installed thereon, and a polarizing plate was attached to create a direct type backlight device.
- Example 2 For the created direct backlight device, a voltage of 3.8 V and a current of 350 mA were applied to light the LED, and the same evaluation as in Example 1 was performed.
- the average brightness was 5640cd / m 2 and the uneven brightness was 0.69.
- the arrangement of the point light sources is a rectangular array with a longitudinal interval of 35 mm and a transverse interval of 30 mm, and the light diffuser is arranged with concave quadrangular pyramids using the stamper 8 from Production Example 10.
- a direct backlight device was produced in the same manner as in Example 11 except that. In this design of the backlight device, the distance a between the LED centers is 45. lmm,
- the distance b from the LED side of the light diffusing plate is 13.15mm, so the values of a and b are related to PI
- Example 2 For the created direct backlight device, a voltage of 3.8 V and a current of 350 mA were applied to light the LED, and the same evaluation as in Example 1 was performed.
- the average brightness was 5530 cd / m 2 and the uneven brightness was 0.43.
- a direct type backlight device was prepared and evaluated in the same manner as in Example 12 except that the light diffusing plate was formed by arranging convex quadrangular pyramids using the stamper 9 according to Production Example 11.
- the average luminance was 5560 cdZm 2 and the luminance unevenness was 0.40.
- a direct backlight device using LEDs was prepared and evaluated in the same manner as in Example 11 except that the same light diffusion plate as in Comparative Example 1 was used.
- the average brightness was 5980 cdZm 2 and the brightness uniformity was 3.90.
- Table 3 shows configurations and measurement results of Examples 11 to 13 and Comparative Example 5. [0116] [Table 3] Table 3
- ⁇ indicates that the leftmost column in the table was used. One indicates that it was not used.
- the light diffusing plate pellet 3 obtained in Production Example 12 was extruded from a vertical die having a width of 350 mm using a single-line extruder to obtain a plate having a thickness of 2. Omm.
- the cylinder temperature of the single-line extruder was 250 ° C, and the die head temperature was 240 ° C.
- the obtained plate was cut into 237 mm X 315 mm to obtain a flat light diffusion plate.
- a light diffusion plate having a concave structure unit was manufactured by heating the forming roll of Production Example 14 to 140 ° C. and pressing the resulting flat light diffusion plate while rotating.
- Example 15 Evaluation was performed in the same manner as in Example 11 except that the light diffusing plate having the concave structural unit was used.
- the average luminance was 5724 cdZm 2 and the luminance unevenness was 0.69.
- UV curing resin (UV SPA369 manufactured by Teikoku Ink Co., Ltd.) was applied to the same light diffusion plate as in Example 14 to a thickness of 100 ⁇ m with a bar coater, and a high pressure mercury lamp was irradiated with lOOmiZcm 2 at an integrated light quantity. Cured to the extent that it does not flow. Furthermore, a concave shape was imparted by pressing the molding roll of Production Example 14 while rotating it. Immediately thereafter, a light diffusion plate having a concave shape was manufactured by further irradiating a high-pressure mercury lamp with an integrated light amount of 150 mj / cm 2 to complete the curing.
- Example 141 Evaluation was performed in the same manner as in Example 141 except that the light diffusing plate having the concave shape was used.
- the average luminance was 5667 cd / m 2 and the luminance unevenness was 0.49.
- PET film polyethylene terephthalate film having a thickness of 200 ⁇ m
- the same UV-cured resin as in Example 15 was applied to a thickness of 100 m with a bar coater.
- a high-pressure mercury lamp was irradiated from the PET film side with an integrated light amount of 250 mjZcm 2 to complete the curing, thereby producing a film having a concave shape.
- a photocurable adhesive (ThreeBond 3017 manufactured by ThreeBond Co., Ltd.) was applied to the PET film side of this film and adhered onto the same flat light diffusing plate as in Example 14 to produce a light diffusing plate having a concave shape.
- the average luminance was 5639 cd / m 2 and the luminance unevenness was 0.48.
- Flow prevention members having a thickness of 10 mm were installed at the four corners of the mold member of Production Example 15, and the polymerizable composition of Production Example 13 was supplied so that the polymer had a thickness of 2 mm.
- a heating tank ! polymerize for 1 hour at 80 ° C! ⁇ , Bow I Continue to heat at 130 ° C for 1 hour using a far-infrared heater to complete the polymerization and have a concave shape A light diffusion plate was produced.
- Example 4 shows the configurations and measurement results of Examples 14 to 17. Good results were also obtained by the manufacturing methods of these examples.
- the direct type backlight device of the present invention the average luminance and the luminance uniformity can be improved while the distance between the linear light source and the light diffusing plate is small. Therefore, the direct type backlight device is added to the liquid crystal display device. When embedded, a thin liquid crystal display device with high image quality can be obtained.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007535553A JPWO2007032469A1 (ja) | 2005-09-15 | 2006-09-15 | 直下型バックライト装置 |
CN2006800319275A CN101253363B (zh) | 2005-09-15 | 2006-09-15 | 正下型背光灯装置 |
US11/992,097 US7887208B2 (en) | 2005-09-15 | 2006-09-15 | Direct type back-light device |
EP06798014A EP1933080A4 (en) | 2005-09-15 | 2006-09-15 | DIRECTLY LOWERED REVERSE DEVICE |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-269273 | 2005-09-15 | ||
JP2005269273 | 2005-09-15 | ||
JP2005-347294 | 2005-11-30 | ||
JP2005347294 | 2005-11-30 |
Publications (1)
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WO2007032469A1 true WO2007032469A1 (ja) | 2007-03-22 |
Family
ID=37865052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/318351 WO2007032469A1 (ja) | 2005-09-15 | 2006-09-15 | 直下型バックライト装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7887208B2 (ja) |
EP (1) | EP1933080A4 (ja) |
JP (1) | JPWO2007032469A1 (ja) |
KR (1) | KR20080055840A (ja) |
CN (1) | CN101253363B (ja) |
TW (1) | TW200725116A (ja) |
WO (1) | WO2007032469A1 (ja) |
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JP2009098263A (ja) * | 2007-10-15 | 2009-05-07 | Hitachi Ltd | 液晶表示装置及び照明装置 |
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- 2006-09-15 JP JP2007535553A patent/JPWO2007032469A1/ja not_active Withdrawn
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Cited By (17)
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JP2008298839A (ja) * | 2007-05-29 | 2008-12-11 | Toppan Printing Co Ltd | 光学シート、それを用いたバックライトユニット、およびディスプレイ装置 |
JP2009098263A (ja) * | 2007-10-15 | 2009-05-07 | Hitachi Ltd | 液晶表示装置及び照明装置 |
JP2009117276A (ja) * | 2007-11-09 | 2009-05-28 | Radiant Opt-Electronics Corp | 多重構面の光導構造 |
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WO2009096057A1 (ja) * | 2008-01-29 | 2009-08-06 | Toppan Printing Co., Ltd. | 光デバイス、光均一デバイス、光学シート、バックライトユニットおよびディスプレイ装置 |
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US7784958B2 (en) | 2008-05-13 | 2010-08-31 | Toppan Printing Co., Ltd. | Lens sheet, optical sheet, and backlight unit and display apparatus provided therewith |
JP2010020110A (ja) * | 2008-07-10 | 2010-01-28 | Toppan Printing Co Ltd | ディスプレイ装置 |
JP2010218999A (ja) * | 2009-03-19 | 2010-09-30 | Toppan Printing Co Ltd | 光源装置、バックライトユニット、およびディスプレイ装置 |
US8541404B2 (en) | 2009-11-09 | 2013-09-24 | Elexopharm Gmbh | Inhibitors of the human aldosterone synthase CYP11B2 |
JP2013152953A (ja) * | 2013-04-08 | 2013-08-08 | Toppan Printing Co Ltd | バックライトユニットおよびディスプレイ装置 |
WO2019208769A1 (ja) * | 2018-04-27 | 2019-10-31 | 三菱瓦斯化学株式会社 | 光拡散成形体、透明スクリーン用フィルム、及び、光拡散成形体の評価方法 |
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JPWO2019208770A1 (ja) * | 2018-04-27 | 2021-05-13 | 三菱瓦斯化学株式会社 | 光拡散成形体、透明スクリーン用フィルム、及び、光拡散成形体の評価方法 |
JPWO2019208769A1 (ja) * | 2018-04-27 | 2021-05-27 | 三菱瓦斯化学株式会社 | 光拡散成形体、透明スクリーン用フィルム、及び、光拡散成形体の評価方法 |
JPWO2019208771A1 (ja) * | 2018-04-27 | 2021-06-17 | 三菱瓦斯化学株式会社 | 光拡散成形体、及び、透明スクリーン用フィルム |
Also Published As
Publication number | Publication date |
---|---|
CN101253363A (zh) | 2008-08-27 |
US7887208B2 (en) | 2011-02-15 |
EP1933080A1 (en) | 2008-06-18 |
JPWO2007032469A1 (ja) | 2009-03-19 |
KR20080055840A (ko) | 2008-06-19 |
CN101253363B (zh) | 2010-05-19 |
TW200725116A (en) | 2007-07-01 |
US20090268428A1 (en) | 2009-10-29 |
EP1933080A4 (en) | 2008-10-29 |
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