CN104204921B - Shatter prevention film and display device provided with the film - Google Patents
Shatter prevention film and display device provided with the film Download PDFInfo
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- CN104204921B CN104204921B CN201280071824.7A CN201280071824A CN104204921B CN 104204921 B CN104204921 B CN 104204921B CN 201280071824 A CN201280071824 A CN 201280071824A CN 104204921 B CN104204921 B CN 104204921B
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- film
- breakage
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- thin film
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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
-
- 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
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133331—Cover glasses
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/50—Protective arrangements
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention provides a shatter prevention film that can suppress the occurrence of a darkened field of view that occurs when wearing polarized eyewear while using equipment such as a portable device provided with a display device. The shatter prevention film (206) is affixed to a top glass (210) of a display device (201) having a polarizer (205), and is provided with a light transmissive film (207), and an adhesive layer (209) disposed on one surface of the light transmissive film (207). The shape of the light transmissive film (207) is formed so that the angle of the molecular orientation axis of the resin of the light transmissive film (207) is 45+/-20 degrees with respect to the transmission axis of the polarizer (205) of the display device (201) at the nearest position to the top glass (210).
Description
Technical field
The invention mainly relates to one kind is attached at is assembled in mobile phone, portable game machine, notebook computer, digital camera etc.
Portable electric appts (are also referred to as " portable set " in this manual.) on display device top surface of the glass on it is breakage-proof thin
Film.
Background technology
In recent years, the portable set such as mobile phone, portable game machine, notebook computer becomes multifunction, a large amount of to list
Method of the display direction of the image that its display device can be shown in the use of equipment around display device top surface of the glass
Line carries out right angle change, and (so-called " right angle " in the present invention refers to 90 ° ± 10 °.) equipment.
In the feelings that the image formation component of this display device that can change image display direction is liquid crystal display cells
Under condition, be inevitably configured with polarizer between the liquid crystal layer of image and observer directly being formed.Below, will be this aobvious
Polarizer in the polarizer that showing device possesses positioned at the eyes proximal most position from observer is referred to as front end polarizer.
Due to the presence of the front end polarizer, when the observer of display device uses polaroid glasses, polarisation contact lenss
(in the present invention, it is referred to as " the ophthalmically acceptable worn appliance of polarisation " (polarized Deng the ophthalmically acceptable worn appliance with polarizer
eyeware).) in the case of, define the state that multiple polarizers are configured between liquid crystal layer and observer.
In general display device, the display direction that mainly uses in the device (hereinafter referred to as " main display side
To ", " secondary display direction " will be referred to as with its substantially vertical display direction for intersecting.) to direction that be substantially parallel setting front end inclined
Shake the light transmission shaft of device, when polarisation ophthalmically acceptable worn appliance is placed on horizontal plane, the polarization of the ophthalmically acceptable worn appliance of most polarisations
The light transmission shaft of device be set to it is substantially vertical with horizontal direction, to block the reflected light at the horizontal planes such as the water surface.Therefore, make
Display device in the case where main display direction shows, the light transmission shaft of front end polarizer and the polarization of the ophthalmically acceptable worn appliance of polarisation
The light transmission shaft of device is almost parallel, and observer is it can be seen that display image.
However, in the case where making display device show in secondary display direction, making display device around the top of display device
The normal of surface glass at right angles rotates, so that observer can suitably see shown image.Therefore, which is front end polarization
The light transmission shaft of the device state substantially vertical with the light transmission shaft of the polarizer of the ophthalmically acceptable worn appliance of polarisation, i.e. cross-polarization
(cross nicol) state.Now, observer can not confirm display image by visual observation.Hereinafter, this phenomenon is referred to as into " scotopia
Fieldization phenomenon ".
For avoiding technical problem as the dark field phenomenon occurs, in patent documentation 1, it is proposed that a kind of liquid crystal
Display device, its protective cover for possessing display panels and being attached to before the display panels, using transparent resin material
While the extrusion molding body of material is as protective cover, by the polarization axis direction of display panels (that is, with front end polarizer
The parallel direction of light transmission shaft) configure at 45 ° ± 10 ° with the molecular orientation direction of the protective cover.
Prior art literature
Patent documentation
Patent documentation 1：Japanese Patent Publication 2002-350821 publication
The content of the invention
(1) technical problem to be solved
However, with regard to the protective cover disclosed in patent documentation 1, the polarization axis direction of display panels and dividing for protective cover
Only 20 ° of the angled permissible range of sub- differently- oriented directivity.Therefore, the protective cover is attached in the operation of display device,
Require higher homework precision.The production efficiency of the product that can so reduce possessing display panels.
Further, since the thickness of the protective cover disclosed in patent documentation 1 is more than 0.2mm, so if right when in use
Protective cover applies pressure, then as the deformation of cover body can make the birefringence localized variation as the material for constituting protective cover, from
And easily produce interference fringe.In nearest portable set in the display device of more touch panel form, especially hold
Easily there is this problem.
Furthermore, in order to improve portability, the thinness of portable set is critically important, in recent years, from appearance design
Viewpoint considers that the thinness of equipment is also paid attention to.Therefore, from front end polarizer in the outer part, except arrange top surface of the glass with
Outward, the protective cover of thickness is also set up, this is unreasonable in the design of commodity.
The present invention be in view of such practical situation and complete, its object is to, there is provided it is a kind of with meet it is nearest just
The form of the thin-walled property is strongly required by formula terminal etc. is taken, avoids using in the state of the ophthalmically acceptable worn appliance of polarisation is worn
The device of the dark field phenomenon that may occur during the display devices such as nearest carried terminal.
(2) technical scheme
In order to achieve the above object, as a result the present inventor etc. obtains following opinion, possesses polarizer being attached to through research
Display device top surface of the glass on breakage-proof thin film transparent thin-film as the thin film being made up of stretching resin film, pass through
Control the light transmission shaft of the molecular orientation axis of the transparent thin-film resin and the polarizer from transparent thin-film most proximal end with this
The angle formed on the parallel perspective plane of polarizer (below, is also referred to as " with near-end polarization axle angle " in this manual.),
Even if the front end polarizer in display device is in orthogonal polarization state with the polarizer of the ophthalmically acceptable worn appliance of polarisation, also can
Enough suppress the generation of dark field phenomenon.And, following opinion is also obtained, by transparent thin-film being made by stretching resin film structure
Into, compared with the situation of protective cover being made up of extrusion molding body is used, can suppress that dark field phenomenon occurs is inclined with near-end
The scope of shaft angle degree of shaking is significantly expanded.
The present invention completed based on the opinion, first, the present invention is a kind of breakage-proof thin film, it is characterised in which is tool
There is the breakage-proof thin film of the shape corresponding with the top surface of the glass of the display device for possessing polarizer, the breakage-proof thin film possesses printing opacity
Property thin film and the adhesive phase being arranged on one face of the transparent thin-film, transparent thin-film are formed by stretching resin film, institute
The molecular orientation axis of the resin for being shaped so as to make the transparent thin-film of transparent thin-film are stated relative to from the top surface glass
The angle of the light transmission shaft of the polarizer of glass most proximal end is 45 ° ± 20 ° (inventions 1).
In foregoing invention (invention 1), the transparent thin-film can be formed (invention 2) by oriented polyester film, also may be used
So that (invention 3) is formed by the thin film of biaxial tension.
In foregoing invention (invention 1), it is also possible to possess and be provided with the one of described adhesive layer in the transparent thin-film
Another adhesive phase (invention 4) arranged on the opposing face in face.
In foregoing invention (invention 1), the image display direction of the display device can also surround the top surface of the glass
The normal of interarea carry out right angle change (invention 5).
Even if in the case where display device possesses the structure, it is also possible to stably suppress sending out for dark field phenomenon
It is raw.
Additionally, second, the present invention is that a kind of suppression cannot see that possess polarizer by the ophthalmically acceptable worn appliance of polarisation
The broken method of the top surface of the glass of the display picture image and the display device of display device, which includes will be provided with by stretching tree
Transparent thin-film and at least one binding agent arranged on the surface of at least side of the transparent thin-film that membrane of lipoprotein is formed
The breakage-proof thin film of layer, is attached on the top surface of the glass by the adhesive phase that the breakage-proof thin film possesses, so that this is anti-
The molecular orientation direction of the resin of the transparent thin-film that broken thin film possesses and the polarization from the transparent thin-film most proximal end
The angle (invention 6) of ± 20 ° at 45 ° of the light transmission shaft of device.
Additionally, the 3rd, the present invention is a kind of display for possessing the breakage-proof thin film in foregoing invention 1 to 5 described in any one
Device, the breakage-proof thin film are attached on the top surface of the glass of the display device (invention 7) by its adhesive phase.
Additionally, the 4th, the present invention is a kind of portable set (invention 8) for possessing the display device described in foregoing invention 7.
(3) beneficial effect
The breakage-proof thin film of the present invention is also equipped with the work(for suppressing dark field phenomenon to occur on the basis of possessing breakage-proof function
Energy.Therefore, the display device for possessing the breakage-proof thin film there is no need for the special component for suppressing dark field phenomenon to occur.Cause
This, is assembled with the thin-walled property that portable set of the display device etc. can realize equipment.It is additionally, since and can suppresses scotopia
What fieldization phenomenon occurred has 40 ° with the scope of near-end polarization axle angle, therefore, the workability of the attaching operation of breakage-proof thin film is excellent
It is different.
Description of the drawings
Fig. 1 is the profile of the breakage-proof thin film for conceptually representing an embodiment of the invention.
Fig. 2 is the display device one for conceptually representing the breakage-proof thin film for being provided with an embodiment of the invention
Profile.
Fig. 3 is another example of display device for conceptually representing the breakage-proof thin film for being provided with an embodiment of the invention
Profile.
Specific embodiment
Below embodiments of the present invention are illustrated.
1. breakage-proof thin film
Fig. 1 is the profile of the breakage-proof thin film for conceptually representing one embodiment of the present invention.
In the present embodiment, so-called " breakage-proof thin film " refers to a kind of material being attached on the top surface of the glass of display device
Material, in the case where top surface of the glass is clashed into, as slight crack can be produced on top surface of the glass, and then crushes and becomes tiny
Fragment, the danger that the fragment that there is observer side comes off and disperses, therefore which is for relaxing the shock to top surface of the glass and preventing
The thin film for only crushing and arranging.
The breakage-proof thin film 1 of present embodiment possesses transparent thin-film 2 and arranges on a side surface of transparent thin-film 2
Adhesive phase 3.
(1) transparent thin-film
In the present embodiment, transparent thin-film 2 is formed by stretching resin film.The stretching resin film is stretched
Resin film prepared by operation, in the stretching process, makes the molecular resin (macromolecule) of composition resin film in draw direction
Upper orientation.According to its Structural Characteristics, when projecting in the plane with linear polarization direction of advance as normal, linear polarization is incident
During to the stretching resin film with the molecular orientation axis that the polarization axle relative to linear polarization is non-parallel relation, then its transmission
Light also has the composition of vibration on the direction different from the polarization axle of incident straight polarisation.Now, if thin through stretching resin
The light of film is incided with the polarisation with the light transmission shaft of the polarization axle vertical direction of the linear polarization for being incident to stretching resin film
Ophthalmically acceptable worn appliance, then light of the light with composition parallel with the light transmission shaft of the polarizer of the ophthalmically acceptable worn appliance of polarisation.Cause
This, the light for being incident to the ophthalmically acceptable worn appliance of polarisation all can't be absorbed, but a part can pass through the ophthalmically acceptable pendant of polarisation
Wear utensil and reach observer.
The draw direction of stretching resin film can be simple tension, can also be biaxial tension.Especially, due to thin film
The high precision of thickness, therefore the thin film of the little biaxial tension of deviation of the optical characteristics in face is more preferred.
The resin of the transparent thin-film 2 of present embodiment is not limited if with light transmission.In addition, thin to light transmission
The lower limit of the light transmittance of film 2 is not particularly limited, but parallel rayies light transmittance is preferably more than 90%.Parallel rayies light transmittance can
To be measured according to JIS K7105.
It is as the resin of transparent thin-film 2, as follows if appropriate resin is enumerated, polyethylene terephthalate
(PET) polyester resin of resin, PEN (PEN) resin, modified poly ester etc.；Polyethylene (PE) resin,
The polyolefin resin of polypropylene (PP) resin, polystyrene resins, cyclic olefin resinoid etc.；It is Corvic, poly- inclined
The vinyl resins of polyvinylidene chloride resin etc.；The polyvinyl acetal resins such as polyvinyl butyral resin (PVB) resin；Polyether-ether-ketone
(PEEK) resin, polysulfones (PSF) resin, polyether sulfone (PES) resin, polycarbonate (PC) resin, polyimide resin, polyamides are sub-
Polyimide resin, acrylic resin, Triafol T (TAC) resin etc..Among those, preferred polyester resin, particularly preferably
The excellent pet resin of cheap and anti-fragility.
The transparent thin-film 2 of present embodiment is shaped so as to, make transparent thin-film 2 resin molecular orientation axis with
Positioned at the display device away from 2 most proximal end of transparent thin-film polarizer light transmission shaft on the perspective plane parallel with the polarizer
The angle (with near-end polarization axle angle) of upper formation is 45 ° ± 20 °.
With regard to the molecular orientation axis of translucent resin thin film 2, in the case where the thin film is simple tension, with its side of stretching
To parallel, and in the case of biaxial tension, according to concrete grammar (temperature during stretching, in the case of stretching successively of stretching
The order of each axle stretching, while draw speed of each axle etc. in the case of stretching) and change.The direction of molecular orientation axis can lead to
Cross and tried to achieve using FT-IR ATR methods and X-ray diffraction method.
Due to the 2 stretched operation of translucent resin thin film of present embodiment, thus with being extruded into by prior art
The protective cover that type body is constituted is compared, and the degree of orientation of molecule is high.Therefore, if being 45 ° ± 15 ° of model with near-end polarization axle angle
Enclose, then in the case where the light transmission shaft of front end polarizer is vertical with the light transmission shaft of the polarizer of the ophthalmically acceptable worn appliance of polarisation
(orthogonal polarization state), incidence that can be by the light of the ophthalmically acceptable worn appliance of transmission polarisation in this case to front end polarizer
The light transmittance of light benchmark is (hereinafter referred to as " crossed transmittance ".) it is set as high levels, such as more than 20% degree.Also,
Drastically reduce as flex point when crossed transmittance is with substantially 45 ° ± 20 ° of near-end polarization axle angle, at 45 ° more than ± 25 °
In the range of, crossed transmittance is below 5% degree.Therefore, by make translucent resin thin film 2 be shaped so as to make and near-end
Polarization axle angle is 45 ° ± 20 °, can avoid dark field phenomenon.If with the model that near-end polarization axle angle is 45 ° ± 15 °
Enclose, then can stably avoid dark field phenomenon.
In addition, the peak value of crossed transmittance changes according to species and thickness of translucent resin thin film 2 etc., but and disobey
Rely in these, as long as translucent resin thin film 2 is made up of stretching resin film, be 45 ° ± 20 ° with near-end polarization axle angle
In the range of can realize the higher state of crossed transmittance.
The degree of molecular orientation of translucent resin thin film 2 can be by retardation (with Δ n d (Δ n：Birefringence, d：
The thickness of thin film) represent.) be estimated.If retardation is more than 10nm, above-mentioned with near-end polarization axle angle it is
In the range of 45 ° ± 20 °, the high state of crossed transmittance can be stably realized, if retardation is more than 100nm, can
More stably to realize above-mentioned state.Although the upper limit of retardation is not particularly limited, due to tone change the problems such as
The probability of generation increases, therefore is preferably set to below 10000nm.In order to obtain these effects, retardation it is more preferred
Scope be 500～6000nm.
The thickness of translucent resin thin film 2 is not particularly limited.The thin film manufactured by stretching is then passed through, therefore also can
Enough thin film that 5 μm of left and right thicknesses are obtained with higher productivity ratio.In the case where translucent resin thin film 2 is excessively thin, according to resin
The species of thin film, it is possible to which elongation at break, tearing strength are reduced and cause the reduction of breakage-proof function.Further, since make from
The ability of the optical property change (giving the heterogeneity of polarization axle) of the linear polarization of front end polarizer becomes too small, therefore
It is also possible to crossed transmittance is not based on reducing with near-end polarization axle angle.Therefore, under the thickness of translucent resin thin film 2
Limit is preferably set to 10 μm or so, is more preferably set as more than 20 μm.
On the other hand, in the case where translucent resin thin film 2 is blocked up, the rising of material cost can be caused.Additionally, thin
In the case that film thickness is excessive, when pressure is applied to thin film, internal strain is easily accumulated.If the internal strain increases,
Birefringence distribution in thin film can increase, from generation interference fringe.Additionally, will also become to make to be pasted with the anti-of present embodiment
The reason for display device integral thickness of broken thin film 1 increases, may hinder the thin-walled property of portable set.In addition, as thoroughly
The material of photosensitiveness resin film 2, it is in the case of using preferred polyester resin, firm due to translucent resin thin film 2
Property become big, so if thickness increase is then handling can reduce.Therefore, the upper limit of the thickness of translucent resin thin film 2 preferably sets
It is set to 200 μm or so, is more preferably set as less than 100 μm.The translucent resin thin film 2 of present embodiment have passed through stretching work
Sequence, the degree of molecularly oriented are higher.Therefore, even this relatively thin thin film, retardation also excessively will not be reduced, can be effectively
The generation of control dark field phenomenon.
From from the viewpoint of guaranteeing durability, translucent resin thin film 2 can also be stable containing UV absorbent, light
Agent, antioxidant etc..Additionally, by improve and tack between the layer set by its surface for the purpose of, according to hope, can be with
By oxidizing process and further provided for contouring method etc. to one side or two-sided enforcement surface treatment (easy adhesion process).As above-mentioned oxidizing process,
Such as Corona discharge Treatment, corona treatment, chromic acid can be enumerated and process (wet type), flame treatment, hot blast process, ozone purple
Outside line treatment with irradiation etc., additionally, such as sand-blast, solvent treatment method etc. can be enumerated as further provided for contouring method.These surface preparations,
Can be properly selected according to the species of base film, but from from the aspect of effect and operability height etc., it is generally preferable to using electricity
Corona facture.Further, it is also possible to arrange basic unit.
(2) adhesive phase
The material of the binding agent of the adhesive phase 3 possessed as the breakage-proof thin film 1 for forming present embodiment, has no especially
Limit, arbitrary material can be properly selected among the usual material of the adhesive phase of existing breakage-proof thin film and be used.Example
Such as, it is possible to use acrylic adhesives, rubber adhesive, silicone adhesive category, polyurethane binding and polyesters
Binding agent etc..These binding agents can also be emulsion-type, solvent-borne type, any type in no-solvent type.Among those, preferably thoroughly
The solvent-borne type that easily can be lost flowability by being dried after bright property height, coating.The thickness of adhesive phase 3 generally 1～300
μm, preferably 5～100 μm degree.
Among these various binding agents, consider from viewpoints such as high-weatherabilities, preferred propylene class binding agent.Using the propylene
Class binding agent formed adhesive phase 3 be adapted to by comprising weight average molecular weight be 500,000～2,000,000 degree, preferably 700,000～
1700000 propylene resin, and the acrylic adhesives composition of crosslinked process.If weight average molecular weight is in above-mentioned model
In enclosing, then bonding force and retentivity breakage-proof thin film in a balanced way can be obtained.
In addition, above-mentioned weight average molecular weight is the conversion of the polystyrene determined by gel permeation chromatography (GPC) method
Value.
As the monomer for giving contained propylene resin in aforesaid propylene class binding agent, (methyl) can be included
Acrylic acid；(methyl) acrylic acid methyl ester., (methyl) acrylic acid 2- hydroxy methacrylates, (methyl) acrylic acid monomethylaminoethylester etc.
(methyl) acrylate；(methyl) acrylamide, N- methyl (methyl) acrylamide, N- methylols (methyl) acrylamide etc.
Acrylic amide.In addition, in the present invention, (methyl) acrylic acid refers to two kinds of acrylic acid and methacrylic acid.It is other similar
Term (" (methyl) acrylate " etc.) is also same.
Propylene resin can be made up of the one kind in these monomers, it is also possible to be made up of various.In addition it is also possible to be with
The copolymer of other monomers.The vinyl esters of vinylacetate, propionate etc. can be included as monomer as that
Class；The olefines of ethylene, propylene, isobutene. etc.；Vinyl chloride, vinylidene chloride etc. are for olefines；Styrene, α-methyl styrene etc.
Styrene monomer；The alkadiene monomer of butadiene, isoprene, chlorobutadiene etc.；The nitrile of acrylonitrile, methacrylonitrile etc.
Class monomer.
In the case that in the propylene class binding agent, contained propylene resin is copolymer, its copolymerization mode is had no
It is particularly limited to, can is the any-mode in random, block, graft copolymer.Additionally, the polymer of propylene resin is constituted,
Can be used alone one kind, it is also possible to be applied in combination two or more.It is two species of combination in the polymer for constituting propylene resin
In the case of mixture more than, the mixture that can be made up of various homopolymer, or by various copolymers
The mixture of composition, can also be the mixture of more than one homopolymer and more than one copolymers.
Propylene class binding agent can be crosslinked the binding agent for processing.As the cross-linking agent used in the crosslinking Treatment simultaneously
It is not particularly limited, can properly selects among usual as cross-linking agent binding agent in existing propylene class binding agent and appoint
The binding agent of meaning and use.As such cross-linking agent, can include as polyisocyanate compound, epoxide, three
Cymel, Lauxite, dialdehyde base class, methylol polymer, metal chelate compound, metal alkoxide, slaine etc., it is excellent
Choosing is using polyisocyanate compounds and epoxide.
In the present embodiment, the cross-linking agent can be used alone one kind, it is also possible to be applied in combination two or more.Additionally,
Depending on its usage amount is also according to the species of cross-linking agent, but the polymer of the composition propylene resin relative to 100 mass parts, one
As in 0.01～20 mass parts, preferably select in the range of 0.1～10 mass parts.
Furthermore, it is possible to according to hope add in the propylene class binding agent viscosifier, antioxidant, UV absorbent,
Light stabilizer, softening agent, silane coupler, filler etc..
Adhesive phase is provided with least one side of the translucent resin thin film 2 in the breakage-proof thin film 1 of present embodiment
3.By this composition, breakage-proof thin film 1 can be bonded on top surface of the glass by adhesive phase 3.Can also be in translucent resin
Being provided with the opposite face of adhesive phase 3 for thin film, arranges another layer of adhesive phase.It is in the case of this spline structure, breakage-proof thin
Film 1 can be bonded in the layer adjacent with the opposing face of top surface of the glass adjacent surface of breakage-proof thin film 1 by another layer of adhesive phase
On, such as in polarization plates etc..
(3) manufacture method of breakage-proof thin film
The manufacture method of the breakage-proof thin film 1 of present embodiment is simultaneously not limited.
Can be applied using existing known method, such as stick coating method, cutter painting method, rolling method, knife coating, die coating method, intaglio plate
Deposited method etc., is directly coated with binding agent to transparent thin-film 2, processes 30 by the heat drying at a temperature of 30～100 DEG C or so
Second～5 minutes degree, thus by adhesive phase 3 on transparent thin-film 2.Stripping film can also be attached to the adhesive phase 3.
Additionally, in the release surface of stripping film, applying binding agent by method as above so as to be dried and arrange viscous
Mixture layer 3, afterwards, the adhesive phase 3 is attached on transparent thin-film 2, is consequently formed and is possessed transparent thin-film 1 and binding agent
The breakage-proof thin film 1 of layer 3, it is also possible to make stripping film be the direct state for attaching.
As stripping film, the stripping film for applying remover on a plastic film can be included.As plastic sheeting
Specific example, polyethylene terephthalate, polybutylene terephthalate (PBT), poly- naphthalenedicarboxylic acid ethylene glycol can be enumerated
The mylar of ester etc., and the polyolefin film of polypropylene, polyethylene etc..As remover, it is possible to use silicone, fluorine
Class, chain alkyl class etc., it is among those, preferably cheap and be obtained in that the silicone of stability is ideal.Substitute
The plastic sheeting of above-mentioned stripping film, it is possible to use in paper base materials such as onionskin, art paper, glazed printing paper or on paper base material upper strata
The stacking paper of the thermoplastic resins such as folded polyethylene.For the thickness of the stripping film is not particularly limited, but usually 20～
250 μm of degree.
2. display device
The display device of present embodiment is that above-mentioned breakage-proof thin film is attached on top surface of the glass.
In case of the display element of display device is as liquid crystal display cells, using Fig. 2 and 3 pair of present embodiment
The structure of display device is illustrated.
Fig. 2 and 3 is the display device for conceptually representing the breakage-proof thin film for being provided with an embodiment of the invention
The profile of one and another.
Display device 201 shown in Fig. 2 is on back light unit 202 to arrange liquid crystal layer 204 by polarization plates 203, in liquid
Polarization plates 205 are further set on crystal layer 204.In the display device 201 of this example, the polarization plates 205 are front end polariser
Part.In polarization plates 205, by the saturating of one of the component of breakage-proof thin film 206 of gap agent or pad deployment present embodiment
Photosensitiveness thin film 207.Therefore, air layer is set between the polarization plates 205 and transparent thin-film 207 that form front end polarizer
208.Also, transparent thin-film 207 is attached at top surface by the adhesive phase 209 as another component of breakage-proof thin film 206
On glass 210.
Display device 301 shown in Fig. 3 is that (back light unit, polarization plates and liquid crystal layer are suitable according to this in liquid crystal display
Sequence is laminated) on 302, in order to improve the display characteristic of liquid crystal display cells, setting is passed through by two phase difference films 303,304
The unit configured with the air layer 305 of the formation such as pad.The position phase of the liquid crystal display distal end in relative to the unit
On difference film 304, polarization plates 307 are provided with by adhesive phase 306.In the display device 301 of this example, by the polarization plates 307
Be formed as front end polarizer.In polarization plates 307, by adhesive phase 308, the breakage-proof thin film of present embodiment is configured with
One of 309 component transparent thin-film 310.Also, transparent thin-film 310 is by the breakage-proof thin film 309 as present embodiment
Another component adhesive phase 311 and be attached on top surface of the glass 312.
Then, on the top surface of the glass 210,312 in display device 201,301 attach present embodiment it is breakage-proof thin
The method of film 206,309 is illustrated.
When breakage-proof thin film 206,309 are attached on top surface of the glass 210,312, make after attaching as from breakage-proof thin film 206,
The light transmission shaft of the polarization plates 205,307 of the polarizer of 309 most proximal ends, i.e. front end polarizer and 206,309 institute of breakage-proof thin film
The molecular orientation direction angulation (with near-end polarization axle angle) of the resin of the transparent thin-film 207,310 for possessing 45 ° ±
20 ° of scope.
In order to stably carry out such attaching, can be by being implemented as follows.First, top surface of the glass is grasped in advance
210th, the angular relationship between the light transmission shaft of 312 shape and front end polarizer.Based on the relation, make to control light transmission thin
The shape of the breakage-proof thin film 206,309 of the molecular orientation direction of the resin of film 207,310 and the shape phase of top surface of the glass 210,312
Correspondence.Attached with the form fit of top surface of the glass 210,312 by making the breakage-proof thin film 206,309 of such setting, made breakage-proof thin
The molecular orientation direction and front end polarizer 205,307 of the resin of the transparent thin-film 207,310 that film 206,309 possesses
Light transmission shaft angulation is in above range.
If being described in detail to this point, then in display device 201,301, the shape of top surface of the glass 210,312
For rectangle, there is almost parallel relation with the light transmission shaft of front end polarizer 205,307 when the direction of the major axis along its rectangle
In the case of, make breakage-proof thin film 206,309 is shaped as rectangle corresponding with the shape of top surface of the glass 210,312, makes light transmission
The major axis angulation of the molecular orientation direction and its rectangle of the resin of thin film 207,310 is in 45 ° ± 20 ° of scope.Also,
When breakage-proof thin film 206,309 is attached on top surface of the glass 210,312, if making the major axis of these rectangles almost parallel,
Stably can realize making the molecularly oriented of the resin in the transparent thin-film 207,310 of the breakage-proof thin film 206,309 for being attached
The light transmission shaft angulation of direction and front end polarizer 205,307 is in 45 ° ± 20 ° of scope.
According to so setting, can obtain realizing top surface of the glass by the breakage-proof thin film 206,309 of present embodiment
210th, 312 breakage-proof and preventing wears the display device 201,301 of the dark field phenomenon occurred during the ophthalmically acceptable worn appliance of polarisation.
3. portable set
The above-mentioned display device 201,301 of present embodiment is preferably assembled into mobile phone, portable game machine, notebook computer
Deng portable set.As it was previously stated, the nearest portable set with smart mobile phone as representative with the equipment of touch-screen form just
Increasing, while picture increases, in storage, exposure situation outside is also more.Therefore, when drop or with foreign body clash into
When, the easy fragmentation of top surface of the glass.However, in the above-mentioned display dress for being assembled with the breakage-proof thin film 206,309 for possessing present embodiment
Put in the case of 201,301, even if top surface of the glass 210,312 is damaged, be also avoided that the degree for being crushed to fine debris.
Additionally, compared with the fixed display device such as display with television set and desktop computer, smart mobile phone etc. is nearest
The chance that portable set is used out of doors significantly increases, and the chance observed by the ophthalmically acceptable worn appliance of polarisation therewith is also more
It is many.In addition, in recent years, the display direction of the picture for showing in a display device in use can be around the normal of top surface of the glass
It is more with the situation that right angle changes.When such portable set is assembled with the display device of prior art, if worn
Under the ophthalmically acceptable worn appliance state of polarisation use portable set, then when display device front end polarizer light transmission shaft and polarisation
When the light transmission shaft of the polarizer of ophthalmically acceptable worn appliance is vertical (orthogonal polarization state), it may occur that the display picture of portable set
The significantly reduced dark field phenomenon of observability.
However, the above-mentioned display device of the breakage-proof thin film 206,309 for possessing present embodiment is assembled with portable set
201st, in the case of 301, though it is above-mentioned that when, the generation of dark field phenomenon can be avoided.
Embodiment
Hereinafter, the present invention is illustrated in greater detail by embodiment etc., but the scope of the present invention is not limited to these enforcements
Example etc..
(embodiment 1～7 and comparative example 1～5)
As the stretching resin film of the raw material of transparent thin-film, prepare poly terephthalic acid second two as shown in Table 1
The thin film that alcohol ester is constituted.These molding by biaxial tension, and easy adhesion process is implemented in two-sided or one side.But
Be, the transparent thin-film of comparative example 4 be by extrusion molding and made by polycarbonate membrane.Additionally, used in comparative example 5
Plexiglass plate is replacing thin film.
For each stretching resin film for so obtaining, (prince measures machines corporation system to determine device using position difference
Make, KOBRA-WR) determine molecular orientation axis direction, with regard to each thin film, it is thus identified that thin-film width direction (the length side with thin film
To vertical direction) for the position dependence (differently- oriented directivity profile) of molecularly oriented direction of principal axis.
Then, each stretching resin film is cut off rectangular and obtains transparent thin-film.Now, it is thin based on each stretching resin
The differently- oriented directivity profile of film, with regard to the rectangle transparent thin-film for cutting out, to make the differently- oriented directivity of the molecule in thin film and rectangle long
The angle formed by axle has the differential seat angle shown in table 1, by adjusting the draw direction of stretching resin film and the major axis institute of rectangle
The angle of formation is being cut off.
<Test example 1>The measure of retardation
With regard to above-mentioned each transparent thin-film, (prince measures machines corporation manufacture, KOBRA- to determine device using position difference
WR) determine retardation.Measurement result is as shown in table 1.
<Test example 2>Crossed transmittance
By prior confirmation, (0.00093) 158 μm of thickness, birefringence are configured to two thoroughly for two polarization plates of light transmission shaft
Optical axis is vertical (orthogonal polarization state), using haze meter (Japanese electricity Se industrial groups manufacture, NDH-5000), it is thus identified that match somebody with somebody at this
In putting, (just passing through the light transmittance of incident illumination benchmark of the incident another polarization plates of white light of polarization plates positioned at exiting side
Hand over light transmittance) for 0%.
Then, above-mentioned transparent thin-film is inserted between these polarization plates, so that as a polarization plates of light incident side
The rectangle longer axis parallel of light transmission shaft and transparent thin-film.Now, the molecular orientation axis of the resin of transparent thin-film are incident with conduct
The angle formed by the light transmission shaft of one polarization plates of side is (corresponding with near-end polarization axle angle.) and the differential seat angle shown in table 1
It is equal.
In this condition, crossed transmittance is determined by haze meter.
Assessment result is as shown in table 1.
As shown in table 1, in the case where differential seat angle is 45 ° ± 20 °, crossed transmittance exceedes the transparent thin-film of embodiment
10%, obtain good result.
Therefore, the breakage-proof thin film being made up of transparent thin-film and adhesive phase of embodiment, except with excellent breakage-proof
Outside function, moreover it is possible to suppress the generation of dark field phenomenon.
Industrial applicibility
The breakage-proof thin film of the present invention is applicable to portable sets such as such as smart mobile phone etc..
Description of reference numerals
1-breakage-proof thin film
2-transparent thin-film
3-adhesive phase
201-display device
202-back light unit
203-polarization plates
204-liquid crystal layer
205-polarization plates
206-breakage-proof thin film
207-transparent thin-film
208-air layer
209-adhesive phase
210-top surface of the glass
301-display device
302-liquid crystal display
303-polarizer
304-polarizer
305-air layer
306-adhesive phase
307-polarization plates
308-adhesive phase
309-breakage-proof thin film
310-transparent thin-film
311-adhesive phase
312-top surface of the glass
Claims (8)
1. a kind of breakage-proof thin film, it is characterised in that with corresponding with the top surface of the glass of the display device for possessing polarizer
Shape,
The adhesive phase for possessing transparent thin-film and being arranged on one face of the transparent thin-film；
The transparent thin-film is formed by stretching resin film；
The molecular orientation axis of the resin for being shaped so as to make the transparent thin-film of the transparent thin-film are relative to from described
The angle of the light transmission shaft of the polarizer of top surface of the glass most proximal end is at 45 ° ± 20 °；
The thickness of the transparent thin-film is more than 10 μm and less than 100 μm.
2. breakage-proof thin film according to claim 1, the transparent thin-film are formed by oriented polyester film.
3. breakage-proof thin film according to claim 1, the transparent thin-film are formed by the thin film of biaxial tension.
4. breakage-proof thin film according to claim 1, possesses and is provided with the one of described adhesive layer in the transparent thin-film
Another adhesive phase arranged on the opposing face in face.
5. breakage-proof thin film according to claim 1, the image display direction of the display device can surround the top surface
The normal of the interarea of glass carries out right angle change.
6. a kind of suppression cannot see that the display picture figure of the display device for possessing polarizer by the ophthalmically acceptable worn appliance of polarisation
As and the display device the broken method of top surface of the glass, it is thin which includes the light transmission that will be provided with being formed by stretching resin film
The breakage-proof thin film of film and at least one adhesive phase arranged on the surface of at least side of the transparent thin-film, by described
Adhesive phase that breakage-proof thin film possesses and be attached on the top surface of the glass so that the light transmission that the breakage-proof thin film possesses is thin
The molecular orientation direction of the resin of film is at 45 ° ± 20 ° with the light transmission shaft of the polarizer from the transparent thin-film most proximal end
Angle, the thickness of the transparent thin-film is more than 10 μm and less than 100 μm.
7. a kind of display device for possessing the breakage-proof thin film in claim 1 to 5 described in any one, the breakage-proof thin film pass through which
Adhesive phase and be attached on the top surface of the glass of the display device.
8. a kind of portable set of the display device possessed described in claim 7.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2012/057830 WO2013145107A1 (en) | 2012-03-26 | 2012-03-26 | Shatter prevention film and display device provided with said film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104204921A CN104204921A (en) | 2014-12-10 |
| CN104204921B true CN104204921B (en) | 2017-03-22 |
Family
ID=49258477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280071824.7A Active CN104204921B (en) | 2012-03-26 | 2012-03-26 | Shatter prevention film and display device provided with the film |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5890896B2 (en) |
| CN (1) | CN104204921B (en) |
| WO (1) | WO2013145107A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105602306A (en) * | 2016-01-21 | 2016-05-25 | 河南信太通讯科技有限公司 | Breakage-proof mobile phone screen |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002350821A (en) * | 2001-05-22 | 2002-12-04 | Alps Electric Co Ltd | Liquid crystal display device |
| JP2006311140A (en) * | 2005-04-27 | 2006-11-09 | Kyocera Corp | Portable terminal |
| EP2328694A2 (en) * | 2008-09-08 | 2011-06-08 | Eastman Chemical Company | Washable psa laminates |
| JP2011033751A (en) * | 2009-07-31 | 2011-02-17 | Meihan Shinku Kogyo Kk | Protective cover for liquid crystal display |
-
2012
- 2012-03-26 CN CN201280071824.7A patent/CN104204921B/en active Active
- 2012-03-26 WO PCT/JP2012/057830 patent/WO2013145107A1/en active Application Filing
- 2012-03-26 JP JP2014507078A patent/JP5890896B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2013145107A1 (en) | 2015-08-03 |
| CN104204921A (en) | 2014-12-10 |
| WO2013145107A1 (en) | 2013-10-03 |
| JP5890896B2 (en) | 2016-03-22 |
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