CN1288458C - Optical layered body having controlled diffusing and transmitting characteristic - Google Patents
Optical layered body having controlled diffusing and transmitting characteristic Download PDFInfo
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- CN1288458C CN1288458C CNB028179943A CN02817994A CN1288458C CN 1288458 C CN1288458 C CN 1288458C CN B028179943 A CNB028179943 A CN B028179943A CN 02817994 A CN02817994 A CN 02817994A CN 1288458 C CN1288458 C CN 1288458C
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—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
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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
- G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
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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
- G02F1/133504—Diffusing, scattering, diffracting elements
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- Nonlinear Science (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
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Abstract
An optical laminate comprising two phases which scatter/transmit light and are different in refractive index, characterized in that one phase larger in refractive index includes a light diffusion film containing many regions each having a columnar structure extending in a film-thickness direction, and a light scattering layer for scattering/transmitting light. The optical laminate may be an optical film formed by laminating a light scattering layer as an adhesive layer on a light diffusion film. An optical laminate having a selective light diffusing property and a condensing property so as to provide an image brighter than conventional ones at a viewing angle.
Description
Technical field
The present invention relates to have the optical laminating goods of controlled light scattering and transmission performance.
Background technology
Reflective LCD device and transmitting/reflecting LCD (incident light that wherein will pass liquid crystal layer is in reflective layer reflects and then pass liquid crystal layer to transmit the eyes that shown image arrives the observer) are generally realized scattering of light by blooming is placed between liquid crystal layer surface and/or liquid crystal layer and the reflection horizon, thereby improve the visibility of the image at wide visual angle.Scattering of light also is considered to diffusion of light.
The conventional method that is used for obtaining scattered light comprises transparent fine grained is scattered in the method for plastic foil with scattered light, and with the surperficial roughening of the plastic foil method with scattered light.
Also proposed wherein to realize the method (disclosing 11-174211 number) of scattering of light referring to Japanese Unexamined Patent Application by the refractive index of utilizing the regional refractive index of segmentation to be different from birefringent film (laminated product by the birefringent film that wherein is dispersed with the different segmentation zone of birefringenct property constitutes).
Also proposed wherein to be dispersed with the polymer film in close grain zone, wherein the segmentation zone is different with the refractive index of other parts, thereby have the scattering of light performance (referring to, for example Japanese Unexamined Patent Application is 11-326610 number, 2000-266936 number and 2000-275437 number).
In addition, also proposed the method by utilizing contact adhesive to come the above-mentioned film of lamination, wherein contact adhesive contains the filler (disclosing 11-223712 number referring to Japanese unexamined patent publication No.) that refractive index is different from the refractive index of contact adhesive.
Yet, because all above-mentioned light scattering methods scattered light isotropically basically, so these methods are disadvantageous, because do not use reflective liquid crystal screen backlight can produce darker image.
In order to overcome this problem, selling light-diffusing film, wherein in polymer film, on the thickness direction of film, form the zone of a plurality of highs index of refraction with cylindrical form.Allegedly this light-diffusing film can be realized selectivity visual angle/diffuse properties according to the incident angle of light.
Compare with the isotropic scatterning type film of routine, this diffuser in fact can produce bright relatively image in specific visual angle.
Yet, even the liquid crystal indicator that uses in the few position of incident light, such as cellular situation under, also need the high image of brightness, because front face brightness and visibility all increase in wide angular field of view.
The objective of the invention is to solve these problems of routine techniques, and provide and have the selective light diffuse properties, can in the visual angle wideer, produce brighter image but also optical laminating goods with optical convergence performance than routine techniques.
Summary of the invention
To achieve these goals, the invention provides following content.
(1) a kind of optical laminating goods, it is characterized in that it comprises light-diffusing film and light scattering layer, light-diffusing film comprises the different two-phase of refractive index that is used for transmission and scattered light, what wherein refractive index was bigger one comprises many zones with the column structure that extends mutually on the thickness direction of film, light scattering layer is used for transmission and scattered light.
(2), it is characterized in that the axle of each column structure that the thickness direction at film extends is parallel to each other in light-diffusing film, and described axle is straight with costal fold according to (1) described optical laminating goods.
(3) according to (1) or (2) described optical laminating goods, it is characterized in that the refractive index of the two-phase of light-diffusing film differs 0.005 to 0.2 at least.
(4) according to (1) to (3) described optical laminating goods, it is characterized in that light-diffusing film is made by the polymeric material of radiosusceptibility.
(5) according to (1) to (4) described optical laminating goods, it is characterized in that light scattering layer comprises matrix resin and filler.
(6) according to (5) described optical laminating goods, it is characterized in that matrix resin and the refractive index between the filler in the light-diffusing films differs 0.05 to 0.5.
(7) according to (5) or (6) described optical laminating goods, the filler that it is characterized in that light scattering layer is spherical.
(8) according to (5) to (7) described optical laminating goods, the matrix resin that it is characterized in that light scattering layer is a kind of contact adhesive.
(9) according to (8) described optical laminating goods, it is characterized in that light scattering layer comprises contact adhesive as matrix resin, light scattering layer also contacts with the light-diffusing film lamination.
(10) according to (1) to (7) described optical laminating goods, it is characterized in that utilizing contact adhesive that light-diffusing film is adhered on the light scattering layer.
(11) according to (1) to (10) described optical laminating goods, it is characterized in that the optical laminating goods are with light-diffusing film and the incorporate blooming of light scattering layer.
(12), it is characterized in that one or more other layer and/or film is arranged between light-diffusing film and the light scattering layer according to (1) to (8) described optical laminating goods.
Description of drawings
Figure 1A and 1B are sectional view and the vertical incidence optical transmission and the scattering property figure of light-diffusing film, and described light-diffusing film comprises the polymer film of the high-refractive-index regions that wherein has cylindrical structural.
Fig. 2 A and 2B are sectional view and the vertical incidence optical transmission and the scattering property figure of light scattering layer, and described light scattering layer comprises the polymer film that wherein is filled with filler.
Fig. 3 A-3C is sectional view and the vertical incidence optical transmission and the scattering property figure of blooming, and described blooming is to obtain by lamination light-diffusing film (it comprises the polymer film of the high-refractive-index regions that wherein has cylindrical structural), light scattering layer (it comprises the polymer film of wherein introducing filler) and light scattering pressure-sensitive adhesive layer (it comprises the contact adhesive of wherein introducing filler).
Fig. 4 is the schematic sectional view of liquid crystal indicator.
Fig. 5 is the schematic sectional view of another kind of liquid crystal indicator.
Fig. 6 A and 6B are illustrated in front elevation and the part side view that uses an example of blooming in the cell phone.
Fig. 7 is the figure of exposure method that is used for explaining the photopolymer of embodiment.
Fig. 8 is used for explaining that embodiment estimates the figure of method of the reflection scattering property of blooming.
Fig. 9 is the figure of the reflection scattering property of the blooming among the expression embodiment.
Figure 10 A and 10B are the figures of the reflection scattering property of the diffuser in the expression Comparative Examples.
Embodiment
Optical laminating goods of the present invention are characterised in that it is the optical laminating goods that comprise light-diffusing film and light scattering layer.Particularly preferred embodiment is the blooming that comprises light-diffusing film and light scattering layer, therefore, below mainly by describing the present invention with reference to such blooming.Yet, can obviously find out from following description, even be present between light-diffusing film and the light scattering layer or during the outside, also can obtain identical action effect when many other film and/or layers.
(light-diffusing film)
The used light-diffusing film of the present invention comprises the different two-phase of refractive index that is used for transmission and scattered light, and what wherein refractive index was bigger one comprises many zones with the column structure that extends mutually on the thickness direction of film.
By the reference accompanying drawing light diffusion phenomenon in this light-diffusing film is described.
Figure 1A is the sectional view that has with the light-diffusing film 1 of the high-refractive-index regions of cylindrical formation.In polymer film 2, form the cylindrical high-refractive-index regions 3 that its diameter approaches light wavelength according to mode with film Surface Vertical orientation.Cylindrical high-refractive-index regions 3 plays the effect of cylindrical lens, thereby makes perpendicular to film, the incident light that promptly is parallel to the cylindrical longitudinal axis carries out scattering according to Gaussian distribution, and its half width for example is about 10 to 20 °.In the light-diffusing film 1 of Figure 1A, to such an extent as to when the very big light of incident angle with respect to film 1 entered with respect to the cylindrical longitudinal axis with bigger pitch angle, the scattering of light performance disappeared and shows high transmittance.For example, with respect to the light of the angle incident on 45 to 60 ° on film surface there not to be the form transmission of scattering in fact.
The emergence angle that Figure 1B is illustrated in the angle (incident angle is 0 °) of incident light and film Surface Vertical is θ's and pass the transmission light intensity of film.The transmission light intensity is a Gaussian distribution, and spread and selectivity can be represented with this half width.In Figure 1B, half width is 10 °.
Because this selective light scattering and transmission performance, when film being used for reflection or saturating anti-LCDs etc., display screen can have the reflecting properties of selectivity high brightness in the visual field of observer front.
The sectional dimension of the column structure in the used light-diffusing film of the present invention is unrestricted, but preferred 10nm to 100 μ m.
The method that is used to form the column structure in the used light-diffusing film of the present invention does not have concrete restriction, can be selected from all conventional known methods, yet preferably elective irradiation has the polymer film of radiosusceptibility and forms the method for the column structure of high index of refraction thus.Polymkeric substance can be prepolymer or monomer at pre-irradiation, if necessary, can carry out polymerization by the method the heating after irradiation.Column structure in the radiosusceptibility polymer film can be by the irradiation of radiation sensitive polymer film, form by the mask that forms required pattern on the surface of radiosusceptibility polymer film.Mask can utilize known as photolithographic method forms.In addition, radiation source can also be scanned on the radiosusceptibility polymer film with direct formation radiosusceptibility zone.Can also use by laser beam or other method and in polymer film, form the method in hole and the material of high index of refraction is inserted method in the hole.
Formation and directed circular face and the direction straight of being not limited to zone of column structure with costal fold, but column structure can have ellipse or other cross sectional shape, shape and size can not fixed, and row perhaps can flatten by the pitch angle between formation and the film.In addition, if they substantially parallel also be enough.
The material that is used for therein forming by radiant exposure the radiosusceptibility polymer film of high-refractive-index regions does not have concrete restriction, still, for example can use purchase from the OMNIDEX of DuPont (registered trademark), HRF 150 and HRF600.
The refractive index of polymer film matrix and high-refractive-index regions does not have concrete restriction in the present invention, can be complementary such as used optical element by consideration and other element and select, still, refractive index is preferably 1.2 to 1.8, more preferably 1.35 to 1.8, and more preferably near 1.48.Birefringence is because of existing pigmentation rather than preferred, and still, birefringence can be present in and can allow in the birefringent application.Polymer film matrix and high-refractive-index regions itself all preferably made by the high material of transmittance.Refractive index difference between polymer film matrix and the high-refractive-index regions is preferably big as much as possible, but the difference of refractive index is set in 0.005 to 0.2.If the difference of refractive index less than 0.005, then is difficult to obtain satisfied scattering property.
The refractive index of polymer film raw material and high-refractive-index regions can have very big variation at the interface this two-phase, still, and the preferred progressive variation owing to can obtain preferred scattering property.
The thickness of the light-diffusing film that the present invention is used still is generally about 2 μ m to 100 μ m without limits.Suitably select thickness according to application target by this scope.
(light scattering layer)
The used light scattering layer of the present invention is described below in an identical manner.
In the present invention, light scattering layer typically refers to the photic zone that has the isotropy light scattering property basically.Such light scattering layer can produce by the whole bag of tricks described in the background technology, and still, light scattering layer generally constitutes by filler being introduced the light-transmissive resin matrix.Especially, use contact adhesive to be easy to bonding and be laminated on the light-diffusing film, and be preferred as the layer of matrix resin.Yet in the present invention, the viscosity of light scattering layer self is not substantial needs.With light-diffusing film and light scattering layer (promptly, light-diffusing films) uses contact adhesive respectively (if necessary, can use the bonding agent that is different from contact adhesive) carry out bonding and lamination, resin combination forms light scattering layer (for example by extrusion molding or coating) on light-diffusing film, perhaps just light-diffusing film and light scattering layer (that is light-diffusing films) are deposited in and use pressure sensitive adhesive layer together and not.
Optical laminating goods of the present invention are not limited to light scattering layer is carried out the embodiment of lamination directly to contact with light-diffusing film, and still, as mentioned above, one or more layers and/or film may reside between light-diffusing film and the light scattering layer or the outside.
Fig. 2 A represents the schematic sectional view of light scattering layer, and described light scattering layer contains filler in contact adhesive or matrix resin, and Fig. 2 B represents the scattering strength of transmitted light according to the mode identical with Figure 1B.When Fig. 2 B was compared with Figure 1B, it was different from the selectivity scattering property (with the scattering of concrete width means) of the light-diffusing film of Figure 1A as can be seen, all showed gentle scattering property in the most incident angle.
The used light scattering layer of the present invention does not have concrete restriction, as long as the penetrating light intensity of described layer has the performance shown in Fig. 2 B.For example, can use and wherein introduce and be dispersed with transparent fine grain plastic foil, wherein introduce and be dispersed with the birefringent film in segmentation zone or the laminated product of birefringent film with different birefringenct properties, perhaps wherein disperse and be distributed with the polymer film in the fine crystal zone that constitutes by same polymkeric substance, yet preferably by filler being inserted the layer that contact adhesive constitutes.Pressure sensitive adhesive layer also is favourable, this be since utilize contact adhesive with described layer, described film or other optical element lamination to contact with light scattering layer, so can prevent at an easy rate between described layer, described film or optical element and the light scattering layer (except occurring between light scattering layer and the light-diffusing film, also comprise occur in light scattering layer and be different from the film of light-diffusing film or layer, between for example reflecting plate) space of the minimizing optical transmission efficient that produces, and can improve the picture contrast and the visibility of liquid crystal indicator.
In the light scattering layer of the type, can the effect that to use all directions light in the wide region and the visibility that has improved wide sight plane be provided like this with the incident light of wide angle form in the wide range inscattering.
The example that is used to constitute the contact adhesive of light scattering layer comprises resin such as polyester-based resin, epoxy, polyurethane-based resin, silicone and acryloyl group resin.These resins can use separately or use with two or more array configuration wherein.In these resins, the acryloyl group resin is preferred, because its waterproof, heat-resisting, fast light etc. reliability are good, the clinging power and the transparency are good, and preparation is easy with the refractive index that obtains to be suitable for liquid crystal indicator.The example of acryloyl group contact adhesive comprises the homopolymer and the multipolymer of acryl monomer such as acrylic acid and ester, methacrylic acid and ester thereof, acrylamide and vinyl cyanide, and at least a and vinyl acetate in these acryl monomer, maleic anhydride and aromatic vinyl monomer are such as cinnamic multipolymer.Especially preferred a kind of polymkeric substance, it comprises the principal monomer that produces viscosity, such as the acrylic acid ethyl, butyl acrylate and 2-ethylhexyl acrylate, monomer as bonding composition, such as vinyl acetate, vinyl cyanide, acrylamide, styrene, methacrylate and methyl acrylate, and be used to improve bounding force or invest the monomer that contains functional group of crosslinked starting point, such as methacrylic acid, acrylic acid, itaconic acid, methacrylic acid hydroxyl ethyl ester, methacrylic acid hydroxyl propyl ester, dimethylaminoethyl methacrylate, acrylamide, n-methylolacrylamide, glycidyl methacrylate and maleic anhydride, and this polymkeric substance has-60 degrees centigrade to-15 degrees centigrade Tg (glass transformation temperature) and 200,000 to 1,000,000 weight-average molecular weight.
As the rigidizer of contact adhesive, for example can use metallo-chelate base, isocyanate group and epoxy radicals crosslinking chemical, if necessary, can use separately or use with two or more array configuration wherein.Preferably the acryloyl group contact adhesive is mixed, thereby bounding force is 100 to 2 under the situation of the filler that contains the following stated, 000g/25mm.If bounding force is less than 100g/25mm, then weatherability is poor, especially separate with meeting under the high humility at high temperature, yet if bounding force surpasses 2000g/25mm, it is impossible applying again, perhaps promptly allow to repetitive coatings, also can stay the residue of contact adhesive unfriendly.The refractive index of acryloyl group contact adhesive is preferably 1.45 to 1.70, and more preferably 1.5 to 1.65.
The example that be generally used for scattered light, constitutes the filler of light scattering layer comprises inorganic Chinese white such as silicon dioxide, lime carbonate, aluminium hydroxide, magnesium hydroxide, clay, talcum and titania and organic transparent or Chinese white such as acryl resin, polystyrene resin, epoxy resin and silicones.When selecting the acryloyl group contact adhesive; silica bead grain and epoxy resin bead with refractive index difference given to this invention are preferred; because they have good dispersiveness in the acrylic contact adhesive, can obtain even, good light scattering thus.As for the shape of filler, preferably can provide the Ball-type packing of uniform light scattering.
The granularity of filler is suitably 0.1 to 20.0 μ m, preferred 0.5 to 10.0 μ m, more preferably 1.0 to 10.0 μ m.If granularity less than 0.1 μ m, then is difficult to demonstrate by containing the resulting effect of filler, and light scattering property descends, thereby is easy to produce the aluminium color on the background of image.On the other hand, although light must be carried out fine dispersion to obtain blank sheet of paper performance (paper white property), if but granularity surpasses 20.0 μ m, then the background of pictorial element is easy to show as wrinkle sheet state because of excessive coarse particle, the reduction of blank sheet of paper performance and the poor contrast of image result.
The refractive index of the filler that the present invention is used must differ 0.05 to 0.5 with the refractive index of contact adhesive.Difference between these refractive indexes is preferably 0.05 to 0.3.If the difference of refractive index is less than 0.05, then can not obtain light scattering property and good blank sheet of paper performance, yet, if the difference of refractive index surpasses 0.5, too strong scattering-in can take place reduce with the transmittance that causes all light and can not obtain the blank sheet of paper performance.Because easiness of regulating and good throughput rate are so the refractive index of filler preferably is lower than the refractive index of contact adhesive.
In light scattering layer of the present invention, the content of filler is preferably 1.0 to 40.0wt%, and more preferably 3.0 to 20.0wt%, according to the contact adhesive meter.If the content of filler less than 1.0wt%, then is not easy to demonstrate by containing the resulting light scattering effect of filler, light scattering property descends, and is difficult to obtain effect of the present invention, interior front face brightness and the visibility raising of wide angular field of view just.On the other hand, if the content of filler surpasses 40.0wt%, then the bounding force of light scattering layer descends, thereby causes separation and infringement durability easily, and is difficult to give play to the function as light scattering layer.
Comprise by the suitable example of filler being introduced the light scattering layer (light-diffusing films) that resin matrix of the present invention constitutes filler (it comprises, and refractive index with resin differs 0.05 to 0.5, preferred 0.05 to 0.3, granularity be inorganic or organic fine grained of 5nm to 50 μ m) is introduced the made light scattering flat sheet membrane of cellulose base resin.It is because birefringence is less and in order to improve cohesive, described film is carried out oxidation processes with polarising sheet that the cellulose base resin is used for translucent resin.The difference of refractive index is 0.05 or bigger, and reason is, if difference less than 0.05, then can not obtain substantial dispersion effect, in order to reach scattering, must add filler with very large amount.The difference of refractive index is 0.5 or littler, preferred 0.3 or littler, and reason is if the difference of refractive index surpasses 0.5, then must reduce the content of filler in the light-transmissive resin and can not obtain uniform light scattering layer.Granularity is 5nm or bigger, and reason is, if granularity less than 5nm, the difficulty that becomes of the dispersion in resin bed then, and the limit of available even thin particulate matter is 5nm.In addition, granularity is 50 μ m or littler, and reason is, if granularity surpasses 50 μ m, then filler stretches out to form rough surface, result from resin layer surface, the surface is bleached to reduce the visibility of pictorial element, and the thickness that has increased film simultaneously is to limit moldable filler or resin.
The filler of introducing light-diffusing films is suitably plastic beads, more preferably the transparency height, with the plastic beads of refractive index difference in above-mentioned scope of matrix resin.1.57), acryloyl group bead (refractive index: 1.49), acryloyl group-styrene beads (refractive index: 1.54), polycarbonate bead, polyetylene beads and vinyl chloride bead the example of such plastic beads comprises melamine bead (refractive index:.In addition, can also use inorganic filler such as ceria (CeO
2, refractive index: 1.63).Under the situation of ceria, can utilize little fine grained to about 5nm.From these fillers, can suitably select and use the filler of aforesaid granularity as 5nm to 50 μ m.
Under the situation of the transparent filler that adds above-described organic filler form, organic filler is easy to produce precipitation in resin combination, therefore can add inorganic filler such as silicon dioxide to prevent precipitation.When the amount of the inorganic filler that adds strengthens, prevent that the effect of organic filler precipitation from becoming big, still, can influence the transparency of coating so unfriendly.For example, by its granularity is preferably 0.5 μ m or lower inorganic filler can prevent precipitating action to introducing less than the amount of 10wt% with 0.1wt%.
The refractive index of cellulose base resin is generally 1.46 to 1.54, still, and when the refractive index of resin is compared with the refractive index of filler and when low, by the fine inorganic particles that refractive index is high, such as TiO
2(refractive index: 2.3-2.7), Y
2O
31.87), La (refractive index:
2O
31.95) and ZrO (refractive index:
2(refractive index: 2.05) join in the light-diffusing films to keeping the degree of scattering property to improve refractive index.
(blooming and the laminated product that comprise light-diffusing film and light scattering layer)
The preferred embodiments of the invention blooming is described below.
Fig. 3 A represents the schematic sectional view of blooming 13 of the present invention, the light-diffusing film 11 that wherein has above-mentioned light diffusion performance comprises the different two-phase of refractive index that is used for transmission and scattered light, what refractive index was bigger one comprises many zones with the column structure that extends mutually on the thickness direction of film, and lamination have a light scattering pressure-sensitive adhesive layer 12 of above-mentioned scattering property.Fig. 3 B represents the schematic sectional view of blooming 16, wherein uses light-diffusing film 11 and inviscid light-diffusing films 14 that contact adhesive (preferred a kind of bonding agent) 15 will be identical with Fig. 3 A bonding.Fig. 3 C is according to the transmitted intensity of the blooming of mode presentation graphs 3A identical with Fig. 2 B with Figure 1B and 3B.Transmitted intensity by blooming 13 of the present invention or 16 resulting Fig. 3 B is the summation of transmitted intensity and transmitted intensity by light scattering pressure-sensitive adhesive 12 or light-diffusing films 14 resulting Fig. 2 B by light-diffusing film 11 resulting Figure 1B.Owing to this reason, can improve by the resulting front face brightness of selectivity scattering property and by the visibility in the gentle resulting wide angular field of view of scattering property.
In optical laminating goods of the present invention, such just as described above, do not need light-diffusing film and light scattering layer are always carried out lamination with the form that is in direct contact with one another, one or more other formation layer or film may reside between light-diffusing film and the light scattering layer or the outside.Middle layer or skin can be for example polarized film, anti-reflective film, phase retardation film, λ/2 films, λ/4 films, optical filter, protective seam, liquid crystal layer, luminescent layer, electrode layer or other photic zone, or have or do not have the film of optical function.In the outside of light-diffusing film and light scattering layer, can also have light tight or light reflective layer or film.Light-diffusing film and light scattering layer all need not be individual layer, can contain two or more light-diffusing films or light scattering layer.
In addition, not needing these a plurality of layers or film bonded to each otherly, still, also is enough if in optical device these layers or film are carried out lamination.
Yet most preferred embodiment of the present invention is with light-diffusing film and light scattering layer lamination and incorporate blooming.
Light-diffusing film and light scattering layer lamination and incorporate blooming can be made product by release film being laminated on the light scattering pressure-sensitive adhesive layer, be used for optical device by peeling off release film then.
Blooming of the present invention or laminated product can be used as liquid crystal indicator, especially reflection or the blooming of transflective liquid crystal display device or laminated product and use.
Figure 4 and 5 are all represented an example of liquid crystal indicator.Liquid crystal layer 23 forms between the glass substrate 21 and 22 of electrode (not shown) thereon, usually blooming 24 is placed on the laminated product form of light-diffusing film and light scattering layer on the glass substrate 22 of light incident side of light (Fig. 4), (Fig. 5) are gone up on reflectance coating 25 surfaces that perhaps place it in below the glass substrate 22 of light incident side of light.Under the situation of using polarizer 26 and polarized film 27, these are usually located at the outside of blooming 24.Blooming 24 can be placed both sides.The structure of liquid crystal indicator is not limited to structure shown in this article.Clearly, or even light-diffusing film and light scattering layer also have the front selective light diffuse properties of light-diffusing film provided by the invention and the transmission performance of light scattering layer with the combined laminated product of anti-current plate 26, polarized film 27, electrode layer and liquid crystal layer that random order and these constitute liquid crystal indicators.
In cell phone, preferably use blooming shown in Figure 3 and blooming 33 is placed on the display screen 32 of cell phone 31, shown in Fig. 6 A and 6B, because can obtain best scattering property as an example of liquid crystal indicator.In such cell phone, when observer 34 watches cell phone 31, can utilize from observer's back and above to the front and above incident light 35, and when by the liquid crystal display cells reflex time, mainly optionally scattering on observer 34 direction of light can the coalescence reflection.Under the usual conditions when watching the display screen of cell phone etc., such scattering and reflecting properties have improved the brightness of image.
Embodiment
Embodiment 1
By reference Fig. 7 this embodiment is described.To scribble the thick pet film 41 of the 50 μ m of OMNIDEX HRF6042 (producing) thereon as photopolymer by DuPont, then on the surface of this photosensitive polymer layer 42 by the bonding mask 43 of hard contact method with circular hole pattern.The size of the circular hole pattern of mask is 500nm to 30 μ m, average out to 2 μ m.
To be converged to parallel beam from the ultraviolet ray 44 scioptics systems that mercury vapor lamp obtains and above mask 43, optionally shine with 90 ° of illumination angles perpendicular to mask.Irradiation time is that several seconds are to a few minutes.With described film 120 degrees centigrade of following thermal treatments 1 hour.
As a result, can obtain having the light-diffusing film of following feature: the high-refractive-index regions of cross section structure that obtains according to the hole shape pattern of mask and the column structure that on the normal direction of film, forms.The refractive index of the polymeric matrix of light-diffusing films is 1.47, and the refractive index of high-refractive-index regions is 1.52.
Filler joined in the undercoat material (it is to make in 100 parts of acryloyl group contact adhesives of 1.50 by 1.5 parts of isocyanate group rigidizers (D-90, by Soken Kagaku produce) being joined refractive index) and by stirrer stirred 1 hour.Prepared contact adhesive is coated to 38 μ m thick release (PET3801 is produced by Lintec), and upward extremely dried thickness is 25 μ m, and is dry then to form light scattering layer.On this light scattering layer, release (K-14 is produced by Teijin Limited) that additional 38 μ m are thick is to obtain the light scattering pressure-sensitive adhesive sheet.In this article, used filler is that refractive index is 1.43, particle mean size is the silicones bead of 1.0 μ m, and the content of filler is 3%, and the optical haze value of light scattering layer is 25.This light scattering pressure-sensitive adhesive and above prepared light-diffusing film is mutually bonding to obtain blooming of the present invention.
Measure the transmission and the scattering property of resulting blooming as follows.As shown in Figure 8, light from light source 53 enters the blooming 51 that has reflecting plate 52 on it, measure from the light of film 51 reflections and outgoing by the position that changes light detector 54 then, thereby determine mutual relationship between the light intensity of the direction of reflected light (light that sends) and angle (with respect to the direction and the angle of the direction of propagation of incident light) and scattering, reflection.In addition, by changing blooming 51 with respect to the angle of light source 53 and change incident direction of light and angle thus, can determine the mutual relationship between the light intensity of the direction of reflected light (light that sends) and angle (with respect to the direction and the angle of the direction of propagation of incident light) and scattering, reflection.By incident light and catoptrical direction and angle are followed above-described definition as can be seen referring to figs. 1 through 3.At reflection angle is that 0 o'clock catoptrical intensity becomes the light intensity in the eyes that enter the observer, and is important.
Fig. 9 A represent when light with respect to the vertical direction of blooming 51 resulting scattering during with low-angle incident, catoptrical intensity, Fig. 9 B represent when light with respect to the vertical direction of blooming 51 resulting scattering during with wide-angle incident, catoptrical intensity.As can be seen, under the arbitrary situation in both, at the preceding area scattering of film, catoptrical intensity is higher and function admirable in relative wide range, and can all observe scattering, catoptrical intensity height in the face side of film.Therefore, not only reflected light is assembled effectively in front providing the front face brightness of raising, and even with the normal direction shape part at an angle of film in the brightness that also can obtain suiting, just can obtain the visibility in wide angular field of view.
Obtaining the optical haze value according to the mode identical with embodiment 1 is 15 light scattering pressure-sensitive adhesive, and different is changes to 2% as the content of the silicones bead of filler.Utilize on the release light-diffusing film that this light scattering pressure-sensitive adhesive is adhered to above preparation to obtain blooming of the present invention.
Estimate reflection scattering property according to the mode identical with embodiment 1.
With embodiment 1 similar be, not only reflected light is assembled effectively in front to provide the front face brightness of raising, and even with the normal direction shape part at an angle of film in the brightness that also can obtain suiting, just can obtain the visibility in wide angular field of view.
Joining filler by 1.5 parts of isocyanate group rigidizers (D-90, by SokenKagaku produce) being joined refractive index is to stir 1 hour in the undercoat material prepared in 100 parts of acryloyl group contact adhesives of 1.50 and by stirrer.Upward extremely dried thickness is 25 μ m by the comma coating machine prepared coating to be coated to 38 μ m thick release (PET3801 is produced by Lintec), and is dry then to form light scattering layer.On this light scattering layer, release (K-14 is produced by Teijin Limited) that additional 38 μ m are thick is to obtain the light scattering pressure-sensitive adhesive sheet.In this article, used filler is that refractive index is 1.59, particle mean size is the epoxy resin filler of 5.5 μ m, and the content of filler is 3%, and the optical haze value of light scattering layer is 30.This plate and above prepared light-diffusing film is mutually bonding to obtain blooming of the present invention.
Estimate reflection scattering property according to the mode identical with embodiment 1.
With embodiment 1 similar be, not only reflected light is assembled effectively in front to provide the front face brightness of raising, and even with the normal direction shape part at an angle of film in the brightness that also can obtain suiting, just can obtain the visibility in wide angular field of view.
Embodiment 4
Obtaining the optical haze value according to the mode identical with embodiment 3 is 19 light scattering pressure-sensitive adhesive, and different is changes to 2% as the content of the epoxy resin bead of filler.Utilize on the release light-diffusing film that this light scattering pressure-sensitive adhesive is adhered to above preparation to obtain blooming of the present invention.
Estimate reflection scattering property according to the mode identical with embodiment 1.
With embodiment 1 similar be, not only reflected light is assembled effectively in front to provide the front face brightness of raising, and even with the normal direction shape part at an angle of film in the brightness that also can obtain suiting, just can obtain the visibility in wide angular field of view.
Comparative Examples
According to the mode identical the reflection scattering property of the single light-diffusing films (not with light-diffusing film phase lamination of the present invention) of routine is studied with embodiment.
The result is illustrated among Figure 10 A and the 10B.Figure 10 A represents low-angle incident scattering of light, catoptrical intensity, and Figure 10 B represents wide-angle incident scattering of light, catoptrical intensity.From the contrast carried out with Fig. 9 as can be seen, under the situation of low-angle incident scattering of light, intensity of reflected light, light is in very narrow angle internal reflection, intensity when reflection angle is 0 °, just the intensity on observer's direction is compared with embodiment and is seemed lower, and wide-angle incident scattering of light, intensity of reflected light are all lower on whole directions.
According to the present invention, the light-diffusing film that will comprise polymer film (it has the high-refractive-index regions of the column structure that extends on the thickness direction that is formed on film) and the light scattering layer that is used for transmission and scattered light be lamination mutually, can realize thus by resulting front face brightness of selectivity scattering property and the raising by the visibility in the gentle resulting wide angular field of view of scattering property.
Claims (12)
1. optical laminating goods, it comprises light-diffusing film and light scattering layer, described light-diffusing film comprises the different two-phase of refractive index that is used for transmission and scattered light, described light scattering layer is used for transmission and scattered light, it is characterized in that refractive index in the light-diffusing film bigger one comprise many zones mutually, described zone has the column structure with circle or elliptical shape in cross-section that extends on the thickness direction of film, and can play the effect of cylindrical lens, the axle of described each column structure is parallel to each other with the front selective light diffuse properties of realization light-diffusing film and the isotropic scatterning and the transmission performance of light scattering layer.
2. optical laminating goods according to claim 1 is characterized in that the axle of the described column structure that extends is straight with costal fold on the thickness direction of film.
3. optical laminating goods according to claim 1 and 2 is characterized in that the refractive index of the described two-phase of described light-diffusing film differs 0.005 to 0.2.
4. optical laminating goods according to claim 1 is characterized in that described at least light-diffusing film is made by the polymeric material of radiosusceptibility.
5. optical laminating goods according to claim 1 is characterized in that described light scattering layer comprises matrix resin and filler.
6. optical laminating goods according to claim 5 is characterized in that described matrix resin in the described light scattering layer and the refractive index between the described filler differ 0.05 to 0.5.
7. optical laminating goods according to claim 5 is characterized in that the described filler of described light scattering layer is spherical.
8. optical laminating goods according to claim 5, the described matrix resin that it is characterized in that described light scattering layer is a kind of contact adhesive.
9. optical laminating goods according to claim 8 is characterized in that described light scattering layer comprises contact adhesive as described matrix resin, and described light scattering layer also contacts with described light-diffusing film lamination.
10. optical laminating goods according to claim 1 is characterized in that utilizing contact adhesive that described light-diffusing film is adhered on the described light scattering layer.
11. optical laminating goods according to claim 1 is characterized in that described optical laminating goods are with described light-diffusing film and the integrated resulting blooming of described light scattering layer.
12. optical laminating goods according to claim 1 is characterized in that one or more other layer and/or film is arranged between described light-diffusing film and the described light scattering layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP282010/2001 | 2001-09-17 | ||
| JP2001282010A JP4928693B2 (en) | 2001-09-17 | 2001-09-17 | Optical laminate with controlled scattering and transmission characteristics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1555498A CN1555498A (en) | 2004-12-15 |
| CN1288458C true CN1288458C (en) | 2006-12-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028179943A Expired - Fee Related CN1288458C (en) | 2001-09-17 | 2002-09-09 | Optical layered body having controlled diffusing and transmitting characteristic |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP4928693B2 (en) |
| KR (1) | KR20040044934A (en) |
| CN (1) | CN1288458C (en) |
| MY (1) | MY129486A (en) |
| TW (1) | TWI248523B (en) |
| WO (1) | WO2003025632A1 (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005044744A (en) * | 2003-07-25 | 2005-02-17 | Clariant Internatl Ltd | Surface light source device |
| JP2005050654A (en) * | 2003-07-28 | 2005-02-24 | Clariant Internatl Ltd | Surface light source |
| TW200600825A (en) * | 2004-03-16 | 2006-01-01 | Tomoegawa Paper Co Ltd | Anisotropic light diffusion medium and production method therefor |
| KR100487105B1 (en) * | 2004-06-04 | 2005-05-04 | 주식회사 엘지에스 | Optical film |
| JP5032315B2 (en) * | 2004-07-27 | 2012-09-26 | ドルビー ラボラトリーズ ライセンシング コーポレイション | Light diffuser derived from light source array and display incorporating the same |
| JP4135940B2 (en) * | 2004-10-20 | 2008-08-20 | 株式会社巴川製紙所 | Anisotropic diffusion media |
| JP2007219027A (en) * | 2006-02-14 | 2007-08-30 | Tomoegawa Paper Co Ltd | Anisotropic light scattering sticky member |
| JP2008139736A (en) | 2006-12-05 | 2008-06-19 | Sumitomo Chemical Co Ltd | Light diffusing plate |
| WO2009102951A2 (en) * | 2008-02-15 | 2009-08-20 | 3M Innovative Properties Company | Brightness enhancing film and film based diffuser for improved illumination uniformity of displays |
| CN102159659B (en) * | 2008-09-17 | 2014-10-15 | 3M创新有限公司 | Optical adhesive with diffusive properties |
| JP6096410B2 (en) * | 2010-12-13 | 2017-03-15 | コーニング精密素材株式会社Corning Precision Materials Co., Ltd. | Flat panel display and manufacturing method thereof |
| JP5926941B2 (en) * | 2010-12-15 | 2016-05-25 | リンテック株式会社 | Anisotropic light diffusion film composition and anisotropic light diffusion film |
| CN103403581B (en) * | 2011-03-01 | 2016-03-23 | 东洋纺株式会社 | Viewing-angle increasing film and liquid crystal indicator |
| JP5913938B2 (en) * | 2011-11-30 | 2016-05-11 | 富士フイルム株式会社 | Light diffusing transfer material, method of forming light diffusing layer, and method of manufacturing organic electroluminescent device |
| US9519086B2 (en) | 2012-01-19 | 2016-12-13 | Lintec Corporation | Anisotropic light diffusion film |
| US9523799B2 (en) | 2012-01-19 | 2016-12-20 | Lintec Corporation | Method for producing light diffusion film and light diffusion film |
| JP6228380B2 (en) * | 2012-04-23 | 2017-11-08 | 恵和株式会社 | Viewing angle limiting sheet and flat panel display |
| JP6324662B2 (en) * | 2012-04-23 | 2018-05-16 | 恵和株式会社 | Viewing angle limiting sheet and flat panel display |
| KR101387382B1 (en) | 2013-03-13 | 2014-04-21 | 주식회사 엘지생활건강 | Film and finishing material with lighting |
| JP7218876B2 (en) * | 2017-12-05 | 2023-02-07 | 大日本印刷株式会社 | Optical laminate and image display device |
| JP7201965B2 (en) * | 2017-12-05 | 2023-01-11 | 大日本印刷株式会社 | Optical laminate and image display device |
| JP7132746B2 (en) * | 2018-05-18 | 2022-09-07 | リンテック株式会社 | Moire suppression film, moire suppression film laminate, composite display device provided with moire suppression film |
| JP7414397B2 (en) * | 2019-02-26 | 2024-01-16 | リンテック株式会社 | light diffusion film |
| JP2020134894A (en) * | 2019-02-26 | 2020-08-31 | リンテック株式会社 | Light diffusion film |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3046730B2 (en) * | 1994-11-28 | 2000-05-29 | シャープ株式会社 | Reflective diffuser and reflective liquid crystal display |
| JP3376308B2 (en) * | 1998-03-16 | 2003-02-10 | 株式会社東芝 | Reflector and liquid crystal display |
| JP2000298204A (en) * | 1999-04-15 | 2000-10-24 | Shiseido Co Ltd | Optical reflecting plate and reflection type liquid crystal display device using the same |
| JP4484330B2 (en) * | 1999-09-21 | 2010-06-16 | ダイセル化学工業株式会社 | Anisotropic light scattering film |
| JP2001091708A (en) * | 1999-09-27 | 2001-04-06 | Keiwa Inc | Optical sheet and back light unit using the same |
| JP2001194515A (en) * | 1999-10-27 | 2001-07-19 | Nippon Kayaku Co Ltd | Reflection plate and reflective semitransmissive plate |
| JP2001154005A (en) * | 1999-11-25 | 2001-06-08 | Hitachi Cable Ltd | Light-diffusing plate with high relative refractive index difference and guide device for illumination |
| JP4649693B2 (en) * | 1999-12-20 | 2011-03-16 | コニカミノルタホールディングス株式会社 | Light diffusion film and manufacturing method thereof |
| JP4462514B2 (en) * | 2000-01-31 | 2010-05-12 | 日東電工株式会社 | Optical film and liquid crystal display device |
-
2001
- 2001-09-17 JP JP2001282010A patent/JP4928693B2/en not_active Expired - Lifetime
-
2002
- 2002-08-23 MY MYPI20023121A patent/MY129486A/en unknown
- 2002-09-09 KR KR10-2004-7003871A patent/KR20040044934A/en not_active Application Discontinuation
- 2002-09-09 CN CNB028179943A patent/CN1288458C/en not_active Expired - Fee Related
- 2002-09-09 WO PCT/JP2002/009162 patent/WO2003025632A1/en active Application Filing
- 2002-09-11 TW TW091120714A patent/TWI248523B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JP4928693B2 (en) | 2012-05-09 |
| CN1555498A (en) | 2004-12-15 |
| JP2003090905A (en) | 2003-03-28 |
| MY129486A (en) | 2007-04-30 |
| WO2003025632A1 (en) | 2003-03-27 |
| KR20040044934A (en) | 2004-05-31 |
| TWI248523B (en) | 2006-02-01 |
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