WO2005085914A1 - 光制御フィルムおよびそれを用いたバックライト装置 - Google Patents
光制御フィルムおよびそれを用いたバックライト装置 Download PDFInfo
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- WO2005085914A1 WO2005085914A1 PCT/JP2005/003529 JP2005003529W WO2005085914A1 WO 2005085914 A1 WO2005085914 A1 WO 2005085914A1 JP 2005003529 W JP2005003529 W JP 2005003529W WO 2005085914 A1 WO2005085914 A1 WO 2005085914A1
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- light
- light control
- control film
- curve
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—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
-
- 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
- G02B5/0226—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
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- 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
- G02B6/0051—Diffusing sheet or layer
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- 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
Definitions
- the present invention relates to a light control film used for a knock light device such as a liquid crystal display, and a backlight device using the same.
- an edge light type or a direct type backlight device is used for a liquid crystal display or the like.
- Edge-light type backlight devices are used for notebook PCs because the thickness of the knock light itself can be reduced, and direct-type backlight devices are often used for large-size liquid crystal televisions. .
- a conventional backlight device uses a combination of a plurality of optical films such as a prism sheet and a light diffusion film, and emits the emitted light to the front (for example, See JP-A-9-127314 (Claim 1, Paragraph No. 0034).
- the prism sheet can increase the ratio of light emitted to the front (the surface orthogonal to the film surface) by a surface design based on geometrical optics.
- the interference pattern is caused by the regularly arranged convex portions.
- glare is caused by itself and it becomes difficult to see.
- the viewing angle cannot be widened.
- the prism sheet and the light diffusion film are used in combination.
- the use of a diffusion film reduces the frontal brightness enhanced by the prism sheet, and the lamination of the film causes a -Euton ring between members. It causes problems such as generation and damage due to contact between members.
- Patent document 1 JP-A-9-127314
- the present invention can reliably improve the front luminance alone or in combination with a prism sheet, and has an appropriate light diffusion property, and does not have a problem of an interference pattern or a glare. It is an object to provide a light control film and a backlight device using the same.
- the present inventor has set the surface shape of the light control film in terms of the uneven shape, the length or inclination of the uneven portion with respect to the film surface (reference surface), the uneven height, the pitch, and the like.
- the inclination and shape of the uneven surface with respect to the film surface are controlled appropriately, so that light incident on the film can be efficiently directed to the front direction (outgoing direction) of the film. It has been found that by starting up, the front luminance can be improved.
- Al and A2 are parameters for determining the degree of inclination of the unevenness existing on the film surface
- conditions Bl and B2 are parameters for determining the shape of the unevenness.
- the skewness P is the asymmetry of the height of the unevenness, that is, the degree of deviation (the probability density function in the height direction).
- the probability density function has a normal distribution in the form of kurtosis P force ⁇ . If the kurtosis P is larger, the shape becomes sharper and smaller.
- the light control film of the present invention satisfies at least one of Al and A2 and at least one of Bl and B2 with respect to the condition regarding such inclination and shape.
- the light control film of the present invention is a light control film having an uneven surface, wherein the uneven surface is a cross-sectional edge defined by the uneven surface for an arbitrary cross section perpendicular to a reference surface of the film.
- the average of the absolute values ( ⁇ (degrees)) of the slopes of the curves (hereinafter referred to as cross-sectional curves) with respect to the reference plane is not less than 20 degrees and not more than 75 degrees, and the skew of the cross-sectional curves is
- condition A1 + condition Bl JIS B0601: 2001
- the light control film of the present invention is a light control film having an uneven surface formed by an uneven layer having a material power of a predetermined refractive index n, wherein the uneven surface is a reference surface of the film.
- the average of the absolute value of the slope ( ⁇ ) of the curve at the end of the cross section defined by the uneven surface hereinafter referred to as the cross section curve) with respect to the reference plane.
- ave (degree)) is not less than (36-10 ⁇ ) degrees and not more than (86-10 ⁇ ) degrees, and the absolute value of the skewness (JIS B0601: 2001) of the cross-sectional curve is not more than (n-0.4).
- the following condition is satisfied in substantially all cross-sectional curves (condition A1 '(condition A1 plus refractive index n) + condition Bl).
- the light control film of the present invention is a light control film having an uneven surface, wherein the uneven surface is a cross-sectional edge defined by the uneven surface for an arbitrary cross section perpendicular to the reference surface of the film.
- the average of the absolute values ( ⁇ (degrees)) of the inclination of the curve of the section (hereinafter referred to as the cross-sectional curve) with respect to the reference plane is not less than 20 degrees and not more than 75 degrees, and the Kurtoshi of the cross-sectional curve is
- the light control film of the present invention is formed by a concavo-convex layer having a material power of a predetermined refractive index n.
- the average ( ⁇ (degrees)) of the absolute value of the inclination with respect to the reference plane is (36 ⁇ 10 ⁇ ) ave
- the light control film of the present invention is a light control film having a concave-convex surface, wherein the concave-convex surface has an arbitrary cross section perpendicular to the reference surface of the film.
- the ratio (L L2ZL1) of the length (L2) of the curve of the cross-section end defined by the uneven surface (hereinafter referred to as the cross-section curve) to the length (L1) of the straight line defined by
- the condition that L ⁇ 1.8 and the absolute value of the skewness (JIS B0601: 2001) of the cross-sectional curve is 1.2 or less is satisfied for substantially all cross-sections ( Condition A2 + B1).
- the light control film of the present invention is a light control film having an uneven surface formed by an uneven layer having a material power of a predetermined refractive index n, wherein the uneven surface is formed on a reference surface of the film.
- the length of the curve (hereinafter referred to as the cross section curve) of the cross section end defined by the uneven surface with respect to the length (L1) of the straight line defined by the intersection of the reference plane and the cross section
- the absolute value of the skewness (JIS B0601: 2001) of the cross-sectional curve is (n- 0.4) It is characterized by satisfying the following conditions for substantially all cross sections (Condition A2 '(Condition A2 plus refractive index n) + Condition Bl).
- the light control film of the present invention is a light control film having an uneven surface, wherein the uneven surface is an arbitrary cross section perpendicular to the reference surface of the film, and the intersection of the reference surface and the cross section
- the condition that L ⁇ 1.8 and the kurtosis (JIS B0601: 2001) force of the cross-sectional curve is 0 or more and 4.5 or less is satisfied for substantially all cross-sections ( Condition A2 + Condition B2).
- the light control film of the present invention is a light control film having a concavo-convex surface formed by a concavo-convex layer having a material power of a predetermined refractive index n, wherein the concavo-convex surface is a reference surface of the film.
- the reference surface of the film means a plane when the film is regarded as a schematic plane, and is opposite to the surface of the light control film of the present invention on which the unevenness is formed. If the surface is smooth, it can be regarded as the reference surface. In addition, when the opposite surface is not smooth but an uneven surface, a surface including the center lines in the two different directions can be regarded as a reference surface.
- the slope of the cross-sectional curve with respect to the reference plane is generally obtained by differentiating the cross-sectional curve f (x) with X
- a cross-sectional curve is measured from an arbitrary point on an uneven surface in an arbitrary direction by a surface shape measuring device.
- the measurement result is a position (d, d, d, ..., d) at a predetermined interval (Ad) in the section direction
- the data is expressed as a graph in which the vertical axis represents the height of the unevenness and the horizontal axis represents the direction of the cross-sectional curve.
- the average of the slopes obtained for all portions of the cross-sectional curve sectioned at the predetermined interval (Ad) is defined as the average ⁇ ⁇ of the absolute value of the slope.
- the length of the above-described interval (Ad) is a length that can sufficiently accurately reflect the shape of the uneven surface included in the cross-sectional curve, and specifically, is about 1.0 m or less. is there.
- a light guide plate having a light source disposed at at least one end and having a light exit surface substantially orthogonal to the one end, and light disposed on a light exit surface of the light guide plate
- the light control film is used as the light control film.
- a knock light device is characterized in that a prism sheet is used between the light control film of the backlight device and the light guide plate.
- the backlight device of the present invention comprises a light source, a light diffusion plate disposed on one side of the light source, and a light control film disposed on another side of the light source of the light diffusion plate.
- the light control film is used as the light control film.
- the light control film of the present invention has an irregular surface of a specific shape, of the light that enters from the opposite side to the irregular surface and exits from the irregular surface side, it has a front surface, particularly an emission angle of 0 to 30 degrees.
- the range of components can be increased, and a much higher frontal brightness can be achieved than with conventional diffusion films. It also has a moderate force and moderate light diffusion, and does not cause glare or interference patterns.
- the backlight device of the present invention uses a specific light control film, It is a backlight device that has a high surface luminance and has a moderate light diffusing property with no glare or interference pattern. Further, it is possible to suppress the occurrence of scratches on the prism sheet due to contact between the prism sheet and other members.
- FIG. 3 (a)-(c) is a diagram schematically showing an embodiment of the light control film of the present invention.
- the light control film of the present invention is formed by forming fine irregularities on one surface of a substantially flat film, and is characterized by the shape of the irregularities.
- the irregularities may be formed on a layer formed on one surface of the film as a substrate as shown in (a) and (b), or may be formed as shown in (c).
- the light control film may be composed of only the layers.
- the frontal force of the emitted light when light having a surface force on the opposite side to the surface on which the irregularities are formed is incident on the irregular surface, the frontal force of the emitted light also falls within a predetermined angle range.
- the direction of the light is controlled so that the light component is increased, thereby increasing the frontal luminance and providing light diffusion that can prevent glare.
- the surface on the side opposite to the surface on which the irregularities are formed is typically a smooth surface, but is not limited to a smooth surface. For example, it may be a matsutoidori or a predetermined dot pattern formed.
- the refractive index n inside the convex portion was calculated as 1.5, which is the refractive index of a general acrylic resin.
- FIG. 5 is a graph showing the emission light distribution as a result of simulating the convex portion having the shape shown in FIG.
- the solid line shows the outgoing light distribution
- the dotted line shows the incident light distribution.
- Figure 6 shows the results.
- the horizontal axis is the average ( ⁇ ⁇ ) of the absolute values of the slopes of the cross-sectional curves
- the vertical axis is the emitted light energy
- the first group 601 is the emitted light within the range of 6 degrees with respect to the z-axis (hereinafter referred to as the emitted light).
- the second group 602 is within 18 degrees of the z axis
- Outgoing light (hereinafter referred to as outgoing light), the third group 603 is within 30 degrees of the z-axis.
- emission light 30 Included emission light (hereinafter referred to as emission light 30).
- FIGS. 7 and 8 are diagrams showing the results of the simulation, and both show the change in the emitted light energy when the average (0) of the absolute value of the slope is plotted on the horizontal axis.
- the average ( ⁇ (degree)) force of the absolute values of the slopes of this cross-sectional curve is 20 degrees or more and 70 degrees or less, preferably ave
- the kurtosis P of the surface curve is 1.5 or more and 5.0 or less, preferably 1.5 or more and 4.5 or less ku
- FIG. 9 shows the result of simulating the relationship between the length ratio (L) of the cross-sectional curve and the emitted light energy.
- the horizontal axis is the ratio (L) of the length of the cross-sectional curve to the length of the straight line defined by the intersection between the reference plane and the cross section of the light control film, and the vertical axis is the emitted light energy.
- the group 901 of 1 is for outgoing light within 6 degrees about the z-axis (hereinafter referred to as outgoing light).
- the second group 902 is the outgoing light included in the range of 18 degrees about the z-axis (hereinafter referred to as outgoing light)
- the third group 903 is the outgoing light included in the range of 30 degrees about the z-axis (hereinafter referred to as the outgoing light).
- the ratio r 30 of the emitted light increases as the length ratio (L) increases, but tends to decrease as the ratio increases to a certain extent. Therefore, when examining a comprehensive index of the concavo-convex shape that can be correlated with the emitted light, the light control film
- FIG. 10 and FIG. 11 are diagrams showing the results of the simulation, and both show the change of the emitted light energy when the length ratio (L) is plotted on the horizontal axis.
- the kurtosis (P) value of the cross-sectional curve was 1.0 or more and 4.5 or less (see “see” in Fig. 11).
- the kurtosis P of the cross-sectional curve is 1.0 or more 4.
- substantially all cross-sections means that when observing a plurality of cross-sections of a specific light control film, it suffices to satisfy all of the observed cross-sections.
- the meaning includes the case where the cross section of 2 is included.
- the above condition is not satisfied because there are few irregularities V. In some cases, the force is relatively long.
- the conditions of the present invention shall be satisfied.
- the convex portion has a material force having a refractive index of 1.5.
- a material generally used for an optical film can be adopted, and its refractive index is not limited to 1.5.
- the average ( ⁇ (degree)) of the absolute value of the slope of the cross-sectional curve is not less than (36-10 ⁇ ) degrees and not more than (86-10n) degrees.
- the above effect can be obtained when the absolute value of the skewness of the curve is (n ⁇ 0.4) or less, and the kurtosis of the cross-sectional curve is 1.5 or more (10 ⁇ 11) or less.
- the length ratio (L) is not less than (1.9-0.5n) and not more than 1.8, and the absolute value of the skewness of the sectional curve is not more than (n-0.4).
- the above effect is obtained when the kurtosis of is not less than 1.0 and not more than (10 ⁇ -11.5).
- the luminance in the front direction can be further improved.
- the light control film of the present invention can be made to have a certain level of diffusivity with high front luminance by designing the uneven surface to satisfy the above-mentioned conditions.
- This The light control film of the present invention having such characteristics is disposed, for example, directly on a light guide plate of an edge light type backlight device or on a light source of a direct type backlight device via a light diffusing material or the like, It is used as a film for controlling the direction of the emitted light.
- the arrangement of the protrusions is not particularly limited as long as the cross-sectional curve of the uneven surface satisfies the above-described conditions, but it is preferable that the protrusions and the recesses are randomly arranged. With the random arrangement, it is easy to substantially satisfy the above conditions in all cross sections, and the occurrence of an interference pattern can be prevented.
- the shapes of the individual projections and depressions may be the same! / Different! /, And may be arranged so as to overlap each other, or arranged so that some or all of the projections and depressions overlap. You may.
- the height of the protrusions and the depth of the recesses are both about 3 to 100 m, and the arrangement density of the protrusions or the recesses is about 10 to 200,000 Z mm 2 .
- Fig. 12 shows the uneven surface of a typical light control film satisfying the above conditions.
- the base material 11 is not particularly limited as long as it has good light transmittance, and is not particularly limited.
- a plastic film such as cellulose, acrylic, or polychlorinated vinyl can be used.
- the material constituting the uneven layer 12 is not particularly limited as long as it has good light transmittance, and glass, polymer resin, or the like can be used.
- the glass include oxidized glass such as silicate glass, phosphate glass, and borate glass.
- polyester resin acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane atalylate resin, epoxy atalylate resin, urethane resin, Epoxy resin, polycarbonate resin, cellulose resin, acetal resin, bullet resin, polyethylene resin, polystyrene resin, polypropylene resin, polyamide resin, polyimide resin, Melamine-based fat, phenol-based And thermoplastic resins such as fats, silicone resins, and fluorine resins, thermosetting resins, and ionizing radiation-curable resins.
- polymer resins are preferred in terms of workability and handleability. Particularly, those having a refractive index (JIS K7142: 1996) of about S1.3.1.7. preferable. Even when a material having a refractive index ⁇ outside the above range is used as a material for forming the uneven layer, good brightness can be achieved by satisfying the condition ( ⁇ 1 OR A2) AND (Bl OR B2). High brightness can be obtained by using a material having a proper range. In particular, by making the uneven surface satisfy the condition (A1 ′ OR '2 ′) AND (B1 OR B2) according to the refractive index of the material, the front luminance can be further improved.
- the uneven layer 12 may contain a light diffusing agent such as organic beads or an inorganic pigment as in a general light diffusing sheet, but is not essential.
- a light diffusing agent such as organic beads or an inorganic pigment as in a general light diffusing sheet, but is not essential.
- a certain degree of light diffusion effect can be exerted on the uneven surface itself without including a light diffusing agent. Therefore, other members are not damaged due to the light diffusing agent, and the light diffusing agent does not peel off and generate dust.
- a method of forming the uneven layer 12 for example, 1) a method using an embossing roll, 2) an etching treatment, and 3) molding by a mold can be adopted.
- a method using a mold is preferable in that a light control film having the same can be manufactured.
- a mold having a shape force complementary to the uneven surface is prepared, and a material for forming the uneven surface, such as a polymer resin, is poured into the mold and cured, and then removed from the mold.
- a material for forming the uneven surface such as a polymer resin
- a method for forming a shape complementary to the concave and convex surface on the mold is not particularly limited, but the following method can be employed.
- convex portions having a specific shape are formed on a flat plate so that the arrangement density is, for example, several thousand Zmm 2, and this is used as a male mold to produce a mold (female mold).
- a convex part of a specific shape is defined by measuring the cross-sectional curves of the entire convex part at equal intervals with a width (1.0 m or less) that correctly reflects the shape, and averaging the conditions (Al OR A2) AND ( Bl OR B2).
- the resin in which particles of the particle size are dispersed is cured to prepare a resin plate having an uneven layer, and the surface of the uneven layer is measured with a surface measuring device, and a resin plate that meets the above conditions is selected.
- This is used as a male mold to make a mold (female mold) for molding.
- the surface of the light control film opposite to the surface on which the uneven layer force is also formed may be smooth.
- a mat treatment or an anti-reflection treatment for improving light transmittance may be performed.
- the optical property of the light control film is desirably 60% or more, preferably 70% or more.
- haze is a value of haze in JIS K713 6: 2000
- haze (%) [( ⁇ / ⁇ ) — ⁇ ( ⁇ / ⁇
- ⁇ is a value obtained from the formula of 100 ( ⁇ : luminous flux of incident light, ⁇ : transmitted through the test piece)
- the thickness of the entire light control film is not particularly limited, but is usually about 20 to 300 ⁇ m.
- the light control film of the present invention described above is mainly used as a part of a backlight device constituting a liquid crystal display, an illuminated signboard, and the like.
- the knock light device of the present invention includes at least a light control film and a light source.
- the light control film described above is used as the light control film.
- the direction of the light control film in the knock light device is not particularly limited, but it is preferable to use the light control film so that the uneven surface is on the light emission surface side. It is preferable that the knock light device adopt a so-called edge light type or a direct type.
- the edge light type backlight device includes a light guide plate, a light source disposed at at least one end of the light guide plate, and a light control film disposed on the light exit surface side of the light guide plate.
- the light control film is used such that the uneven surface becomes the light emission surface.
- the light guide plate has at least one side surface as a light incident surface and one surface substantially orthogonal to the light incident surface. This is an approximately flat force formed to be an emission surface, and is mainly composed of a matrix resin selected from highly transparent resins such as polymethyl methacrylate. If necessary, resin particles having a different refractive index from the matrix resin may be added.
- Each surface of the light guide plate may have a complicated surface shape instead of a uniform plane, or may be provided with a diffusion print such as a dot pattern.
- the light source is arranged at at least one end of the light guide plate, and a cold cathode tube is mainly used.
- Examples of the shape of the light source include a linear light source and an L-shaped light source.
- the edge light type backlight device includes, in addition to the above-described light control film, light guide plate, and light source, a reflector, a polarizing film, an electromagnetic wave shielding film, and the like according to purposes.
- FIG. 13 shows an embodiment of the edge light type backlight device of the present invention.
- This knock light device 140 has a configuration in which light sources 142 are provided on both sides of a light guide plate 141, and a light control film 143 is placed on the upper side of the light guide plate 141 such that the uneven surface is on the outside. .
- the light source 142 is covered with a light source reflector 144 except for a portion facing the light guide plate 141 so that light having a light source power is efficiently incident on the light guide plate 141.
- a reflection plate 146 housed in a chassis 145 is provided below the light guide plate 141. As a result, the light emitted to the side opposite to the emission side of the light guide plate 141 is returned to the light guide plate 141 again, so that the amount of light emitted from the emission surface of the light guide plate 141 is increased.
- the direct-type backlight device is composed of a light control film, a light diffusing material, a light source, and the like, which are sequentially provided on a surface opposite to the light exit surface of the light control film.
- the light control film is used such that the uneven surface is a light emission surface.
- the light diffusing material is for erasing the pattern of the light source.
- a transparent film (lighting curtain) having a dot pattern formed in a portion corresponding to the light source a light diffusing material is provided on a transparent base material.
- a so-called light diffusion film having an uneven light diffusion layer can be used alone or in an appropriate combination.
- a cold cathode tube is mainly used as a light source.
- the shape of the light source is linear or L-shaped Throw.
- the direct-type backlight device may include a reflector, a polarizing film, an electromagnetic wave shielding film, and the like, depending on the purpose, in addition to the light control film, the light diffusing material, and the light source described above.
- FIG. 14 shows an embodiment of the direct-type knock light device of the present invention.
- the backlight device 150 includes a plurality of light sources 152 disposed on a reflector 156 housed in a chassis 155, and a light control film 153 mounted thereon via a light diffusing material 157.
- the structure is
- the backlight device of the present invention uses a light control film having a specific uneven surface as a light control film for controlling the direction of light emitted from a light source or a light guide plate.
- the front brightness can be improved as compared with the above, and the problem of glare that occurs when a prism sheet is used alone is less likely to occur.
- molds (1)-(4) with predetermined irregularities formed by laser microfabrication technology were fabricated, and (1)-(3) molds were made of UV-curable resin with a refractive index of 1.50, ( In the mold of 4), a silicone resin having a refractive index of 1.40 was poured. Next, after the poured resin is cured, the resin is taken out of the mold, and the light control film (1)-(4) of 23 cm (in the direction perpendicular to the light source) X 31 cm (in the direction parallel to the light source) (Examples 1-4) Light control film).
- the surface shape of the uneven surface (light emitting surface) of the light control film (1)-(4) was measured using a surface shape measuring device (SAS-2010SAU-II: Meishinki Co., Ltd.) according to JIS B0601: Measured according to 2001.
- the shape of the stylus of this surface shape measuring device is a conical shape having a spherical tip, the radius of the tip is 2 / ⁇ , and the taper angle of the cone is 60 degrees.
- the measurement interval was 1. O / zm.
- the measurement was performed at five arbitrary positions on each light control film in arbitrary directions, and the average ( ⁇ ⁇ ) of the absolute value of the inclination with respect to the light incident surface of the obtained sectional curve was calculated. Furthermore, the same
- each of the light control films of Examples 14 to 14 had a haze of 70% or more, satisfying the optical characteristics necessary for obtaining good front luminance.
- molds (5)-(8) with predetermined irregularities formed by laser microfabrication technology were produced, and UV-curable resin with a refractive index of 1.50 was used for molds (5)-(7).
- Two molds (8) were filled with a silicone resin having a refractive index of 1.40. Then, after hardening the poured resin, Then, a light control film (5)-(8) of 23 cm ⁇ 31 cm (light control film of Examples 5-8) was obtained.
- Table 3 shows the results obtained for (8) (the unit of the slope is “degree”). Table 3 also shows the results of measuring the haze of the light control films (5) to (8) in accordance with JIS K7136: 2,000 using a turbidity meter (NDH2000: Nippon Denshoku Industries Co., Ltd.).
- the average of the absolute values of the slopes in all the cross-sectional curves was not less than 20 degrees and not more than 75 degrees.
- the kurtosis of all cross-sectional curves was 1.5 or more and 5.0 or less.
- the haze of each of the light control films of Examples 5 to 8 was 70% or more, satisfying the optical characteristics necessary for obtaining good front luminance.
- the light control film (5)-(8) is installed on the light guide plate so that the uneven surface becomes the light emission surface, and is parallel and perpendicular to the light source (cold cathode tube) at the center of the backlight device.
- the results obtained for the light control films (5)-(8) are shown in Table 4 (unit: cdZm 2 ).
- Table 5 shows the results obtained for (9)-(11) (the unit of the slope is “degree”).
- Table 7 shows the results obtained for the light control films (12)-(14).
- the light diffusing sheets of Comparative Examples 7-8 had average values of the absolute values of the inclinations of not less than 20 degrees and not more than 75 degrees at all the measurement points.
- molds (15)-(18) with predetermined irregularities formed by laser microfabrication technology were manufactured, and molds (15)-(17) were made of UV-curable resin with a refractive index of 1.50, (18)
- the mold (1) was filled with silicone resin with a refractive index of 1.40. Then, after the poured resin was cured, the mold force was also removed, and a light control film (15)-(18) of 23 cm (vertical direction to the light source) X 31 cm (parallel to the light source) (Examples 9-12) Light control film).
- the surface shape of the uneven surface (light emitting surface) of the light control film (15)-(18) was measured in accordance with JIS B0601: 2001 using a surface shape measuring device (SAS-2010SAU- ⁇ : Meishinki Co., Ltd.). It was measured.
- the shape of the stylus of this surface shape measuring device is a cone with a spherical tip, the radius of the tip is 2 / ⁇ , and the taper angle of the cone is 60 degrees.
- the measurement interval was 1. O / zm.
- Table 11 shows the results of measuring the haze of the light control films (15)-(18) using a turbidity meter (NDH2000: Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K7136: 2000.
- the light control films of Examples 9-112 had a length ratio (L) of 1.1 or more and 1.8 or less in all cross-sectional curves.
- the absolute values of the skewness of all cross-sectional curves were 1.2 or less.
- the haze of each of the light control films of Examples 9-112 was 70% or more, satisfying the optical characteristics necessary for obtaining good front luminance! / ⁇ ⁇ .
- the light control films (15)-(18) were placed in a 15-inch edge light type backlight device (cool shade).
- the lamp was installed in each of the upper and lower poles of the electrode and the front luminance was measured. That is, the light control film (15) is placed on the light guide plate such that the uneven surface of the light control film (18) becomes the light emission surface, and is parallel to and perpendicular to the light source (cold cathode tube) at the center of the backlight device.
- molds (19) and (22) with predetermined irregularities formed by laser microfabrication technology were manufactured, and the molds (19) and (21) were made of UV-curable resin with a refractive index of 1.50, In one mold (22) A silicone resin with a refractive index of 1.40 was poured. Next, after the poured resin was cured, it was taken out of the mold to obtain a light control film (19)-(22) of 23 cm ⁇ 31 cm (light control film of Examples 13-16).
- the surface shape of the uneven surface (light emitting surface) of the light control film (19)-(22) was measured in accordance with JIS B0601: 2001 in the same manner as in Examples 1-4.
- the measurement was performed at any of the five points on each light control film in any direction, and the length (L2) of the lever was measured according to the obtained cross-sectional curve.
- Table 13 The results obtained for the light control films (19)-(22) are shown in Table 13 (the unit of inclination is “degree”). Table 13 also shows the results of measuring the haze of the light control films (19)-(22) using a turbidity meter (NDH2000: Nippon Denshoku Industries) according to JIS K7136: 2000.
- the light control films of the examples had a length ratio (L) of 1.1 or more and 1.8 or less in all cross-sectional curves.
- the kurtosis of all cross-sectional curves is 1.0 or less.
- Above 4.5 was below.
- the haze of each of the light control films of Examples 13 to 16 was 70% or more, satisfying the optical characteristics necessary for obtaining good front luminance.
- the light control films of Comparative Examples 9-11 had a length ratio (L) of 1.1 or more and 1.8 or less in all the cross-sectional curves. While applying force, the absolute value of the skewness of all cross-sectional curves was greater than 1.2.
- UV-curable resin with a refractive index of 1.50 was poured into the molds. Next, after the poured resin was cured, it was taken out of the mold to obtain a 23 cm ⁇ 31 cm light control film (26)-(28) (light control film of Comparative Examples 12-14).
- the light control films of Comparative Examples 12 to 14 had a length ratio (L) of 1.1 or more and 1.8 or less in all the cross-sectional curves. While applying force, the knolletic force of all the cross-sectional curves was greater than 1.0 / J and the force was greater than 4.5. [0141] Next, the light control films (26)-(28) were incorporated into a 15-inch edge light type backlight device (one for each of the upper and lower cold cathode tubes), and the front luminance was measured.
- the light control film (26) is placed on the light guide plate so that the uneven surface of the light control film (28) becomes the light emission surface, and the light source (cold cathode tube) at the center of the backlight device is parallel and perpendicular to the light source.
- the results obtained for the light control films (26)-(28) are shown in Table 18 (unit: cdZm 2 ).
- the light control film of the example has excellent front luminance and moderate light diffusion by making the uneven surface satisfy a specific configuration. Met.
- a light control film into a backlight device, it has been possible to obtain a backlight device in which the front luminance is high and no glare or interference pattern occurs.
- FIG. 1 is a view for explaining the uneven surface of the light control film of the present invention.
- ⁇ 2 Diagram for explaining the cross-sectional curve of the light control film of the present invention
- FIG. 4-1 Cross-sectional view of 3D convex shape used to simulate the difference in emission angle characteristics depending on the shape
- FIG. 7 is a diagram showing the results of a three-dimensional simulation
- FIG. 11 is a diagram showing the results of a three-dimensional simulation
- FIG. 12 A perspective view showing an example of the uneven surface of the light control film of the present invention.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims
Priority Applications (2)
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US10/591,760 US7481564B2 (en) | 2004-03-03 | 2005-03-02 | Light control film and backlight unit using the same |
JP2006510693A JP5090730B2 (ja) | 2004-03-03 | 2005-03-02 | 光制御フィルムおよびそれを用いたバックライト装置 |
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JP2004-059603 | 2004-03-03 | ||
JP2004059602 | 2004-03-03 | ||
JP2004059603 | 2004-03-03 | ||
JP2004-059602 | 2004-03-03 |
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WO2005085914A1 true WO2005085914A1 (ja) | 2005-09-15 |
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PCT/JP2005/003529 WO2005085914A1 (ja) | 2004-03-03 | 2005-03-02 | 光制御フィルムおよびそれを用いたバックライト装置 |
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US (1) | US7481564B2 (ja) |
JP (2) | JP5090730B2 (ja) |
KR (1) | KR100955170B1 (ja) |
TW (1) | TW200602758A (ja) |
WO (1) | WO2005085914A1 (ja) |
Cited By (6)
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JP2009104076A (ja) * | 2007-10-25 | 2009-05-14 | Dainippon Printing Co Ltd | 光学積層体、偏光板及び画像表示装置 |
JP2011113981A (ja) * | 2009-11-23 | 2011-06-09 | Chi Mei Electronics Corp | バックライトモジュール及びその光学パネル |
WO2011074647A1 (ja) * | 2009-12-17 | 2011-06-23 | 株式会社 きもと | 光拡散性シート及びこれを用いたバックライト |
WO2011074648A1 (ja) * | 2009-12-17 | 2011-06-23 | 株式会社 きもと | 光拡散性シート及びこれを用いたバックライト |
JP5323709B2 (ja) * | 2007-09-27 | 2013-10-23 | 株式会社きもと | 光拡散性シート |
WO2015125656A1 (ja) * | 2014-02-21 | 2015-08-27 | 住友化学株式会社 | 偏光板、光学部材セット及びタッチ入力式画像表示装置 |
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US7320823B2 (en) * | 2006-02-14 | 2008-01-22 | Kimoto Co., Ltd. | Light diffusing body and a transmission type screen |
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JP6382491B2 (ja) * | 2013-06-27 | 2018-08-29 | 住友化学株式会社 | タッチパネル及びそれを備える画像表示装置 |
KR20190119432A (ko) * | 2018-04-12 | 2019-10-22 | 삼성전자주식회사 | 표시 장치용 윈도우 및 그 제조 방법과 표시 장치 |
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Also Published As
Publication number | Publication date |
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JP5466617B2 (ja) | 2014-04-09 |
TW200602758A (en) | 2006-01-16 |
JP2011081389A (ja) | 2011-04-21 |
TWI361933B (ja) | 2012-04-11 |
JP5090730B2 (ja) | 2012-12-05 |
KR100955170B1 (ko) | 2010-04-29 |
JPWO2005085914A1 (ja) | 2008-01-24 |
KR20070015390A (ko) | 2007-02-02 |
US7481564B2 (en) | 2009-01-27 |
US20070171654A1 (en) | 2007-07-26 |
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