CN105319613B - Optical film and display device with touch panel - Google Patents

Abstract

The present invention provide can inhibit to shine upon, Newton's ring while inhibit dazzle and total mist degree and the low optical film of internal haze and the display device with touch panel that can sufficiently inhibit watermark and dazzle to generate.A kind of optical film, it is with the composition for being laminated with optical layer of the surface with concaveconvex shape on Mght-transmitting base material, it is characterized in that, total mist degree value is 0% or more and 5% or less, internal haze value is 0% or more and 5% or less, when the transmission image definition for using the light comb of 0.125mm wide to measure is set as C (0.125), the transmission image definition that the light comb for using 0.25mm wide measures is set as to (0.25) C, meet following formula (1) and formula (2).C (0.25)-C (0.125) >=2% (1)；C (0.125)≤64% (2).

Description

Optical film and display device with touch panel

Technical field

The present invention relates to optical film and with the display device of touch panel.

Background technique

In liquid crystal display (LCD), CRT display (CRT), plasma scope (PDP), electroluminescent hair On the picture display faces of image display devices such as optical display unit (ELD), Field Emission Display (FED), in general, in order to inhibit to observe The background of person and observer etc. is shone upon, and being provided with has anti-reflection layer in the indent and convex antiglare film of surface tool, in outmost surface Antireflection film.

Antiglare film is to make extraneous light that scattering occur to inhibit the back of observer and observer in the male and fomale(M&F) of antiglare layer The film of scape etc. shone upon.Antiglare film mainly has Mght-transmitting base material and is arranged in anti-dazzle with male and fomale(M&F) on Mght-transmitting base material Layer.

Antiglare layer usually contains binder resin and is present in binder resin and is used to form the particle of male and fomale(M&F).

But in the case where such antiglare film to be configured to the surface of image display device, the male and fomale(M&F) of antiglare layer So that image light scatters, it is possible to produce so-called dazzle.For such problems, the internal haze for improving antiglare film is proposed To inhibit the scheme of dazzle (for example, with reference to patent document 1).

In recent years, the Horizontal number of pixels of referred to as 4K2K (3840 × Vertical number of pixels of Horizontal number of pixels 2160) is had developed For the fine image display device of 3000 or more superelevation.

It is also aobvious in image in the same manner as above-mentioned image display device in the fine image display device of such superelevation Show that antiglare film is arranged in face, but for the image display device fine for superelevation, it is desirable that higher than previous brightness, translucency.

Here, the reduction of brightness, light transmittance can be caused if improving total mist degree, the internal haze of antiglare film, therefore, In the fine image display device of superelevation, as described above for inhibiting the means of dazzle, it cannot use and improve antiglare film Means as internal haze.In addition, image light diffuses in antiglare film if improving the internal haze of antiglare film, a part Image light is likely to become stray light, as a result, dark contrast reduces, and image may also obscure.Therefore, currently, as group Film in the image display device fine mounted in superelevation, it is desired to be able to inhibit dazzle and total mist degree and the low film of internal haze.

In addition, in recent years, the small type mobile devices equipped with touch panel such as smart phone, tablet terminal are quickly popularized, But in such small type mobile devices, due to the superelevation fining of display image, the problem of the dazzle of image display device Become more significant, on the other hand, it is desirable that higher than previous brightness, translucency.

In the past, it is known that the display dress with touch panel on the display panels such as liquid crystal display configured with touch panel It sets, in small type mobile devices as described above, also uses the band touch-control on image display device configured with touch panel more The display device of panel.In such display device with touch panel, can by with finger etc. touch picture display face come Directly input information.

When touch panel to be fixed on display panel, display panel and touch panel reserve interval mostly and configure. That is, display panel and touch panel are configured across air layer (air gap) (for example, with reference to patent document 2) mostly.

For the picture display face of the display device with touch panel, it is not only the journey with touchings such as fingers in nature Degree, and can also be pressed sometimes with the strength such as finger.In the case where picture display face is strongly pressed, touch panel becomes Shape, therefore, the distance between touch panel and display panel narrow (thickness of air layer is thinning), in the display surface of touch panel The surface reflected light of plate side interferes with the surface reflected light in the touch panel side of display panel and generates ox Pause ring, there are problems that reducing the visual of picture.

In addition, in recent years, just in the slimming of the display device of push belt touch panel and larger in area.With band touch-control The progress of the slimming of the display device of panel, the distance between touch panel and display panel become narrower, in addition, with The progress larger in area of display device with touch panel, touch panel become easy deformation.Therefore, become the problem of Newton's ring It obtains more significant.

It should be noted that hereinafter, the Newton's ring generated with the deformation of touch panel is also particularly referred to as watermark.

Aiming at the problem that such watermark, for example, proposing following scheme in patent document 3: in touch panel and liquid crystal Potting resin material in the gap of display panel and form resin layer, eliminate as a result, with touch panel and liquid crystal display panel Gap interface reflection.

But when potting resin material is to manufacture final product, even if in touch surface after producing final product Unfavorable condition is found in plate, and also only the touch panel can not be replaced.In addition, it is difficult to which resin material is filled up completely touching In the gap for controlling panel and liquid crystal display panel, contain bladdery state if being formed, the original of the defect of display image can be become Cause.

Here, known following method: in the display device that display panel and touch panel reserve interval and configure, aobvious The surface setting male and fomale(M&F) for showing panel, makes incident light diffusion using the male and fomale(M&F), to inhibit the generation of Newton's ring (for example, ginseng See patent document 4).

It, should but in such display device with touch panel that the surface of display panel is provided with male and fomale(M&F) Male and fomale(M&F) scatters image light, generates so-called dazzle sometimes.

It is same as the above-mentioned film being assembled in the fine image display device of superelevation aiming at the problem that such dazzle, It also can not be using the method for the internal haze for improving display panel.

In addition, size aiming at the problem that such dazzle, also to concave-convex interval (Sm) and pixel that for example make male and fomale(M&F) It is studied in the direction that method for being comparably less than half etc. reduces concave-convex interval.But the image fine for superelevation For display device, it is unable to fully inhibit dazzle sometimes using the existing method for reducing concave-convex interval.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2010-102186 bulletin

Patent document 2: Japanese Unexamined Patent Publication 2010-15412 bulletin

Patent document 3: Japanese Unexamined Patent Publication 2004-077887 bulletin

Patent document 4: Japanese Unexamined Patent Publication 2002-189565 bulletin

Summary of the invention

Problems to be solved by the invention

In view of above-mentioned status, the purpose of the present invention is to provide can inhibit to shine upon, Newton's ring while inhibit dazzle And total mist degree and the low optical film of internal haze and the display with touch panel that can sufficiently inhibit watermark and dazzle to generate Device.

Means for solving the problems

The present invention be a kind of optical film, have be laminated on Mght-transmitting base material surface with concaveconvex shape optical layer Composition, which is characterized in that total mist degree value be 0% or more and 5% hereinafter, internal haze value be 0% or more and 5% hereinafter, The transmission image definition that the light comb for using 0.125mm wide measures is set as C (0.125), the light comb of 0.25mm wide will be used to survey When fixed transmission image definition is set as (0.25) C, meet following formula (1) and formula (2),

C (0.25)-C (0.125) >=2% (1)

C (0.125)≤64% (2).

In addition, another way of the invention is a kind of optical film, have with surface is laminated on Mght-transmitting base material The composition of the optical layer of concaveconvex shape, which is characterized in that the surface of the optical film apparent height distribution half-peak breadth be 200nm or more, the average curvature of concave-convex surface are 0.30mm^-1Below.

For optical film of the invention, the total mist degree value of preferably above-mentioned optical film is 0% or more and 5% hereinafter, above-mentioned light The internal haze value for learning film is 0% or more and 5% or less.

In addition, for optical film of the invention, the total mist degree value of preferably above-mentioned optical film be 0% or more and 1% hereinafter, on The internal haze value for stating optical film is essentially 0%.

In addition, preferably above-mentioned optical layer contains binder resin and particle for optical film of the invention.

Additionally, it is preferred that above-mentioned particle is inorganic oxide particle.

It is preferred that the average primary particle diameter of above-mentioned inorganic oxide particle is 1nm or more and 100nm is hereinafter, on additionally, it is preferred that Stating inorganic oxide particle is the inorganic oxide particle that surface is carried out silicic acid anhydride.

In addition, the present invention is a kind of display device with touch panel, have optical film and touch surface of the invention The oppositely disposed composition of plate, which is characterized in that optical film of the invention and above-mentioned touch panel have gap between each other It is oppositely disposed in the mode facing with each other with above-mentioned touch panel of the optical layer in above-mentioned optical film under state.

Hereinafter, explaining the present invention in detail.

It should be noted that " resin " refers to also include monomer in case of no particular description, is low in this specification Concept including polymers etc..

In addition, hereinafter, for common item in the optical film of the invention of optical film and other modes of the invention, Optical film of the invention is only claimed to be illustrated.

Present inventor has performed further investigations, as a result, it has been found that, by making the surface of optical film form specific concaveconvex shape, It can highly inhibit the generation of dazzle to be influenced without the internal haze by optical film, and then find, pass through optical film and touching Controlling the oppositely disposed composition of panel also can highly inhibit watermark even if being equipped with gap between optical film and touch panel Generation, good display image can be obtained, so as to complete the present invention.

It should be noted that since such optical film of the invention can also highly inhibit Newton's ring as watermark Generation, accordingly it is also possible to be used as and the oppositely disposed optical layer to use of touch panel.

Fig. 1 is the sectional view for schematically showing optical film of the invention.

In optical film 11 of the invention, with Mght-transmitting base material 12 and surface have concaveconvex shape the stacking of optical layer 13 and At composition.

The total mist degree value of optical film 11 of the invention is 0% or more and 5% hereinafter, also, internal haze value is 0% or more And 5% or less.

Total mist degree value and internal haze value are value when being integrally measured as optical film.

It should be noted that haze meter (HM-150, color skill in village can be used in above-mentioned total mist degree value and internal haze value Manufactured by art research) by being measured based on the method for JIS K7136.Specifically, being surveyed using haze meter according to JIS K7136 Determine the total mist degree value of optical film.Then, on the surface of optical film, triacetyl cellulose substrate is pasted by transparent optical adhesive layer (Fuji Photo Film Co., Ltd.'s manufacture, TD60UL).The concaveconvex shape on the surface of optical film collapses as a result, and the surface of optical film becomes flat It is smooth.Then, in this state, measured using haze meter (HM-150, color technical research institute manufacture in village) according to JIS K7136 Thus haze value finds out internal haze value.The internal haze does not add internal haze when concaveconvex shape for the surface of optical film.

The total mist degree value of optical film 11 of the invention is preferably 1% hereinafter, more preferably 0.3% or more and 0.5% or less. Internal haze value is preferably essentially 0%.Here, " internal haze value is essentially 0% " is not limited to internal haze value is entirely 0% the case where, though meaning include internal haze value be greater than 0% but still in the range of evaluated error, internal haze value can To be considered as 0% range (for example, 0.3% internal haze value below) substantially.

In the total mist degree value of optical film 11 be 0% or more and 5% or less, internal haze value is 0% or more and 5% is below In the case of, the surface haze value of optical film 11 is 0% or more and 5% or less.The surface haze value of optical film 11 be preferably 0% with Above and 1% hereinafter, more preferably 0% or more and 0.3% or less.Surface haze value is only by the concaveconvex shape on the surface of optical film 11 Cause, by subtracting internal haze value from total mist degree value, can find out only as caused by the concaveconvex shape on the surface of optical film 11 Surface haze value.

It is clear in the transmission image for the optical film 11 that the light comb that will use 0.125mm wide measures in optical film 11 of the invention Clear degree is set as C (0.125), the transmission image definition for the optical film 11 that the light comb for using 0.25mm wide measures is set as C (0.25) when, meet following formula (1) and formula (2).

C (0.25)-C (0.125) >=2% (1)

C (0.125)≤64% (2)

It should be noted that above-mentioned " transmission image definition " can use the image definition based on JIS K7374 The transmission image definition measurement device of transmission beam method measures.As such measurement device, for example, SUGA TEST The image definition analyzer ICM-1T etc. of INSTRUMENTS company manufacture.

In addition, as shown in Fig. 2, transmission image definition measurement device 100 have light source 101, slit 102, lens 103, Lens 104, light comb 105 and optical receiver 106, using lens 103 make to issue from light source 101 and pass through from slit 102 Light becomes directional light, so that the directional light is irradiated to 12 side of Mght-transmitting base material of optical film 11, is made using lens 104 from optical film 11 The light that transmits of concaveconvex shape 14 of optical layer 13 assemble, receive the light that passes through from light comb 105, base using optical receiver 106 In by the received light quantity of optical receiver 106, transmission image definition C is calculated by following formula (3).

C (n)={ (M-m)/(M+m) } × 100 (%) (3)

It should be noted that in formula (3), the transmission image definition (%) that C (n) is the width of light comb when being n (mm), M Highest light quantity when width for light comb is n (mm), the minimum light quantity that m is the width of light comb when being n (mm).

Light comb 105 can be moved along the length direction of light comb 105, with shading light part and transmissive portion.The screening of light comb 105 The ratio between width of light part and transmissive portion is 1:1.Here, in JIS K7374, as light comb, it is specified that being for width 5 kinds of light combs of 0.125mm, 0.25mm, 0.5mm, 1.0mm, 2.0mm.

In the present invention, optical film needs to meet above-mentioned formula (1) and formula (2).Its reason is as follows.

That is, firstly, the preventing property of Newton's rings such as shining upon property, watermark are prevented in order to obtain, on the surface of optical layer in optical film Concaveconvex shape is formed, but the present inventor is the study found that condition by meeting above-mentioned formula (2), that is, make the value of (0.125) C 64% hereinafter, can be effectively prevented shine upon, watermark.

It should be noted that anti-the shining upon property in the present invention refers to shining upon for the background of observer (observer) and observer The characteristic of unnoticed degree, such as refer to: although the presence of observer can be recognized, its profile is unsharp fuzzy State；Although also, can recognize the presence of the object in the background in observer, profile, obscure boundary are clear.In this way, seeing Profile for the person of examining etc. is only fuzzy, reaches the state shone upon do not arouse attention for observer.

On the other hand, the recess portion of the concaveconvex shape, protrusion sometimes assemble light, diffuse and play the role of as lens (lens effect).And think, when generating such lens effect, black matrix" that the pixel of liquid crystal display etc. is separated and Transmitted light from pixel is randomly enhanced, and dazzle is thereby produced.

Then, the present inventor's further progress research, as a result understands fully, by making the optical layer by being formed in optical film Surface concaveconvex shape caused by light diffusion be more minute angle diffusion, specifically, by meeting above-mentioned formula (1) Condition, that is, 2% or more the value for making C (0.25)-C (0.125) is able to suppress the generation of dazzle.Think that its reason is as follows.

That is, small light comb, transmission image definition more will receive the influence of minute angle diffusion and be worth decline.It therefore can To say, smaller in the value under small light comb and under big light comb value is bigger, then the diffusion of extensive angle is fewer.

Result, it is believed that the value relative to (0.25) C, by the value ratio C for making the C (0.25) as big one number light comb (0.125) value is big by 2% or more, is able to carry out the diffusion of minute angle, it is additionally contemplated that, by carrying out the diffusion of minute angle, Lens effect can be made minimum, therefore, can extremely effective prevent dazzle.

Optical film needs to meet above-mentioned formula (1) and formula (2) as a result,.

It should be noted that in general, those skilled in the art it is expected that from the viewpoint of inhibiting dazzle, C (0.25) Value and C (0.125) value difference it is the smaller the better, when the difference is big, dazzle aggravation.This point is in such as Japanese Unexamined Patent Publication 2010- It is also confirmed in No. 269504 bulletins.It is described in the disclosure bulletin, from the viewpoint of inhibiting dazzle, using The ratio between the transmission image definition that the transmission image definition that the light comb of 0.125mm obtains is obtained with the light comb using 2.0mm is 0.70 or more, and preferably make this than being 0.80 or more and 0.93 or less.That is, in the disclosure bulletin, although 0.25mm is not used Light comb, but describe it is above-mentioned than compared to 0.70 or more be more preferably 0.80 or more, therefore, give using 0.125mm's Transmission image definition that light comb obtains and the obtained preferably smaller side of difference of transmission image definition of light comb using 2.0mm Tropism.In contrast, with the prediction on the contrary, 1, in order to inhibit dazzle, makes the value of C (0.25) and the value of C (0.125) in the present invention Difference be 2% or more.

Accordingly, it can be said that the optical film for meeting above-mentioned formula (1) and formula (2) has been above based on conventionally known optical film The optical film for the range that technical level can be predicted.

It should be noted that in the case where referred to as optical laminate, also illustrating that optical film in present specification.

Fig. 3 is the section for schematically showing the display device with touch panel for having used optical film 11 of the invention Figure.

As shown in figure 3, optical film 31 is matched with 35 opposite direction of touch panel in the display device 30 of the invention with touch panel It sets, optical film 31 is laminated with the optical layer 33 that surface has concaveconvex shape 34 on a surface of Mght-transmitting base material 32.

In display device 30 with touch panel of the invention, optical film 3 and touch panel 35 between having between each other It is oppositely disposed in optical layer 33 (concaveconvex shape 34) mode facing with each other with touch panel 35 in the state of gap.

Here, resistance membrane type touch panel, capacitive touch panel etc. can be enumerated as touch panel 35, this In the display device 30 with touch panel of invention, any one mode can be used, wherein preferred electrostatic capacitance touch surface Plate.

In display device 30 with touch panel of the invention, the total mist degree value of optical film 31 be 0% or more and 5% with Under, also, internal haze value is 0% or more and 5% or less.

Total mist degree value and internal haze value are value when being integrally measured as optical film.

In display device with touch panel of the invention, the total mist degree value of optical film 31 is preferably 1% hereinafter, more preferably It is 0.3% or more and 0.5% or less.

Internal haze value is preferably essentially 0%.

Here, " internal haze value is essentially 0% " is not limited to the case where internal haze value is entirely 0%, meaning packet Even if containing internal haze value be greater than 0% but still in the range of evaluated error, internal haze value can be considered as substantially 0% range (for example, 0.3% internal haze value below).

In the total mist degree value of optical film 31 be 0% or more and 5% or less, internal haze value is 0% or more and 5% is below In the case of, the surface haze value of optical film 31 is 0% or more and 5% or less.

The surface haze value of optical film 31 be preferably 0% or more and 1% hereinafter, more preferably 0% or more and 0.3% with Under.

Surface haze value is only caused by the concaveconvex shape on the surface of optical film 31, by subtracting internal mist from total mist degree value Angle value can find out the only surface haze value as caused by the concaveconvex shape on the surface of optical film 31.

In display device with touch panel of the invention, in the optical film 31 that the light comb that will use 0.125mm wide measures Transmission image definition be set as C (0.125), the transmission image for the optical film 31 for using the light comb of 0.25mm wide to measure is clear When degree is set as (0.25) C, meet following formula (1) and (2).

C (0.25)-C (0.125) >=2% (1)

C (0.125)≤64% (2)

In display device with touch panel of the invention, the difference of the value of the value and C (0.125) of above-mentioned C (0.25) is preferred It is 5% or more, more preferably 10% or more.In addition, the difference of the value of the value and C (0.125) of above-mentioned C (0.25) be preferably 30% with Under.

The value of above-mentioned C (0.125) is preferably 60% hereinafter, more preferably 50% or less.In addition, the value of above-mentioned C (0.125) Preferably 5% or more, more preferably 20% or more.

In addition, for the optical film of the invention of another way, the apparent height point on the surface of optical film 11 shown in FIG. 1 The half-peak breadth of cloth is 200nm or more.

Here, the reason for the half-peak breadth 200nm or more for being distributed the apparent height on the surface of above-mentioned optical film is, if In the range, then eye-observation less than watermark, that is, watermark can be made invisible.

As its reason, it is contemplated to various theories, for example, theory as shown below.

Fig. 4 is the display device with touch panel for indicating to be incident on the optical film 11 of the invention for having used another way In the schematic diagram of situation that reflects of light.

As shown in figure 4, for the light from the incidence of 45 side of touch panel, at the interface with gap 46 of 43 side of optical layer The light reflected and the light generation interference reflected through gap 46 on the surface (concaveconvex shape 44) of optical layer 43, according to The thickness of each position in the gap 46 between touch panel 45 and the surface (concaveconvex shape 44) of optical layer 43, the interference of each position Color changes.

It should be noted that showing the case where generating interference in visible wavelength gamut, gap 46 is most in Fig. 4 The interference colours of the light (A) of thick part are red colour system, and the interference colours of the light (C) of the most thin part in gap 46 are blue series, light (B) Yellowish green colour system of the interference colours between light (A) and light (B).

Also, if the variation of such interference colours generates in the unrecognized tiny area of people, and each interference colours occur Colour mixture will not be identified by the human eye as interference fringe (watermark).

That is, the thickness change in gap 46 is corresponding with the distribution of the height of concaveconvex shape 44, therefore, as long as making above-mentioned height point Cloth be formed in human eye in unrecognized region and be formed in the distribution that interference colours are sufficiently generated in visible wavelength gamut ?.

Here, the upper limit wavelength of light path caused by the interference colours of the lower wavelength of visible wavelength and visible wavelength The difference of light path caused by interference colours is maximum when light path is equivalent to 1 wavelength, since visible wavelength is in 380nm~780nm Range, therefore optical path difference at this time be 400nm (780nm-380nm).

Therefore, the height distribution of the optical path difference of 400nm or more and concaveconvex shape 44 therebetween is as impartial as possible if it exists, then Interference colours can be sufficiently generated in visible wavelength gamut.

Also, above-mentioned light path is 2 times of the thickness in gap 46, therefore, as the thickness change in gap 46, as long as being 200nm or more.

In other words, as long as there is the range that the apparent height of the optical layer 43 of concaveconvex shape 44 is 200nm or more on surface It is interior to there is distribution as impartial as possible.

Accordingly, it can be said that as long as the half-peak breadth that the apparent height on the surface of optical film 11 is distributed is 200nm or more, bumps There is distribution as impartial as possible in the range that above-mentioned apparent height is 200nm or more in shape 44, exist in visible light wave The height distribution of interference colours is generated in long gamut, sufficiently so as to keep watermark invisible.

In addition, at this point, in order to ensure the apparent height of the variation of the thickness in gap 46, the i.e. surface of optical layer 43 is distributed in In small region, apparent height distribution is calculated according to the big concave-convex surface distribution curve in interval is eliminated in advance.

That is, using the surface distribution curve for applying long wavelength cutoff optical filter.

From making the unrecognized aspect of human eye, as the wavelength of long wavelength cutoff optical filter, preferably 800 μm.

Here, the half-peak breadth of apparent height distribution indicates: according to utilization contact surface roughness meter or contactless table The surface distribution curve that surface roughness meter (for example, interference microscope, Laser Scanning Confocal Microscope, atomic force microscope etc.) obtains uses Histogram with height of concave convex (unit: nm) is horizontal axis, with frequency (unit: counting) be during bumps obtained from longitudinal axis mapping are distributed Half-peak breadth (width of the distribution at the height of the distribution at peak position, half height position) (unit: nm).

The half-peak breadth of above-mentioned apparent height distribution is preferably 220nm or more, more preferably 250nm or more.

In addition, the half-peak breadth of above-mentioned apparent height distribution is preferably 500nm or less.

When the half-peak breadth of apparent height distribution is more than 500nm, the height of concave-convex surface is excessive, and dazzle is possible to aggravate.

The half-peak breadth of apparent height distribution is more preferably 400nm hereinafter, further preferably 300nm or less.

From simplicity, it is preferable to use interference microscopes to be measured for above-mentioned surface distribution curve.

As such interference microscope, for example, " New View " series etc. of Zygo company manufacture.

The average curvature of the concave-convex surface on the surface of the optical film 11 of the invention of above-mentioned another way is 0.30mm^-1With Under.

For the purpose of preventing watermark, concaveconvex shape is formed on the surface of optical layer, but the bumps of the concaveconvex shape are sometimes Play the role of as lens (lens effect).

And thinks, when generating such lens effect, by the black matrix" of the pixel separation of liquid crystal display etc. and come Randomly enhanced from the transmitted light of pixel, thereby produces dazzle.

It is that the present inventor is studied as a result, it has been found that, the curvature of concaveconvex shape is bigger, and lens effect is stronger, is more easy to produce Dazzle.

Therefore, by making the average curvature 0.30mm of the concave-convex surface of optics film surface^-1Hereinafter, even if forming concave-convex Shape also can extremely efficient prevent dazzle.

The average curvature of concave-convex surface is preferably set to as 0.25mm^-1Hereinafter, being more preferably set as 0.20mm^-1Below.

In addition, the average curvature of concave-convex surface is preferably 0.05mm^-1More than.

Average curvature is less than 0.05mm^-1When, anti-watermark is possible to be deteriorated.

Here, the average curvature of concave-convex surface is found out as follows.

Fig. 5 is the surface distribution curve of above-mentioned optical film, as shown in figure 5, providing A on optics film surface distribution curve In the case where (x1, y1), B (x2, y2) and C (x3, y3), the curvature of B point be can be used as across A point, B point, C point this 3 points circle The inverse of radius find out, be expressed from the next.

[number 1]

On the surface distribution curve got similarly when being distributed with the above-mentioned apparent height of calculating, it will laterally be set as the side x To, short transverse is set as to the direction y, lateral measuring interval is set as d when, x2-x1=x3-x2=d regards y1, y2, y3 as The height of each point, above formula can be rewritten as follows.

[number 2]

Above-mentioned calculating is carried out to each point by surface distribution curve respectively, thus calculates the curvature of each point, to these values It is averaged, thus, it is possible to calculate the average curvature of concave-convex surface.

At this point, atomic small bumps do not contribute lens effect, preferably it is not included in the calculating of curvature, therefore, When seeking surface distribution curve, preferably atomic small concave-convex ingredient is removed using short wavelength's edge filter.

From this aspect, as the wavelength of short wavelength's edge filter, preferably 25 μm.

It should be noted that surface is recessed in general, those skilled in the art are it is expected that from the viewpoint of inhibiting dazzle The value of convex equispaced (Sm) is the smaller the better, and when the value is big, dazzle aggravates (for example, with reference to Japanese Unexamined Patent Publication 2010-191412 Bulletin etc.).

But the equispaced of concave-convex surface, which reduces, means that average curvature increases.

Accordingly, it can be said that the value of half-peak breadth and the average curvature of concave-convex surface of above-mentioned apparent height distribution meet among the above The optical film of specific numberical range has been above the range that the technical level based on conventionally known optical film can be predicted Optical film.

In addition, in the display device of the optical film of the invention that has used another way with touch panel (hereinafter, also referred to as For the display device of the invention with touch panel of another way) in, the optical film of the invention of another way shown in Fig. 3 The half-peak breadth of the apparent height distribution on 31 surface is 200nm or more.

Here, the half-peak breadth of apparent height distribution indicates: according to utilization contact surface roughness meter or contactless table The surface distribution curve that surface roughness meter (for example, interference microscope, Laser Scanning Confocal Microscope, atomic force microscope etc.) obtains uses Histogram with height of concave convex (unit: nm) is horizontal axis, with frequency (unit: counting) be during bumps obtained from longitudinal axis mapping are distributed Half-peak breadth (width of the distribution at the height of the distribution at peak position, half height position) (unit: nm).

In the display device of the invention with touch panel of another way, the half-peak breadth of above-mentioned apparent height distribution is preferred For 220nm or more, more preferably 250nm or more.

In addition, the half-peak breadth of above-mentioned apparent height distribution is preferably 500nm or less.

When the half-peak breadth of apparent height distribution is more than 500nm, the height of concave-convex surface is excessive, and dazzle is possible to aggravate.

The half-peak breadth of apparent height distribution is more preferably 400nm hereinafter, further preferably 300nm or less.

From simplicity, it is preferable to use interference microscopes for above-mentioned surface distribution curve to measure.

As such interference microscope, for example, " New View " series etc. of Zygo company manufacture.

In the display device of the invention with touch panel of another way, the concave-convex surface on the surface of above-mentioned optical film Average curvature is 0.30mm^-1Below.

The average curvature of above-mentioned concave-convex surface is preferably 0.25mm^-1Hereinafter, more preferably 0.20mm^-1Below.

In addition, the average curvature of concave-convex surface is preferably 0.05mm^-1More than.

Average curvature is less than 0.05mm^-1When, anti-watermark is possible to be deteriorated.

It should be noted that surface is recessed in general, those skilled in the art are it is expected that from the viewpoint of inhibiting dazzle The value of convex equispaced (Sm) is the smaller the better, and when the value is big, prediction dazzle aggravation is (for example, with reference to Japanese Unexamined Patent Publication 2010- No. 191412 bulletins etc.).

But the equispaced of concave-convex surface, which reduces, means that average curvature increases.

Accordingly, it can be said that the value of half-peak breadth and the average curvature of concave-convex surface of above-mentioned apparent height distribution meet among the above The optical film of specific numberical range has been above the range that the technical level based on conventionally known optical film can be predicted Optical film.

Optical film of the invention is laminated with the optical layer that surface has concaveconvex shape on Mght-transmitting base material.

As above-mentioned Mght-transmitting base material, as long as being not particularly limited with translucency, for example, cellulose acyl Compound substrate, cyclic olefin polymer substrate, polycarbonate substrate, acrylic ester polymer substrate, polyester base material or glass base Material etc..

As above-mentioned cellulose acylate substrate, for example, cellulose triacetate substrate, cellulose diacetate base Material etc..

In addition, as above-mentioned cyclic olefin polymer substrate, for example, by orbornene-based monomer and monocyclic cycloalkenyl The substrate etc. that the polymer of hydrocarbon monomer etc. is constituted.

In addition, as above-mentioned polycarbonate substrate, for example, being the aromatic series of matrix with bisphenols (bisphenol-A etc.) Aliphatic polycarbonate substrates such as polycarbonate substrate, diethylene glycol diene propyl carbonate etc..

In addition, as above-mentioned acrylic ester polymer substrate, for example, poly(methyl) acrylate base material, Poly- (methyl) ethyl acrylate base material, (methyl) methyl acrylate-(methyl) butyl acrylate copolymer substrate etc..It needs to illustrate , in this specification, (methyl) acrylic acid indicates acrylic or methacrylic acid.

As above-mentioned polyester base material, for example, with polyethylene terephthalate, poly terephthalic acid the third two The substrate etc. of at least one of alcohol ester, polybutylene terephthalate (PBT), polyethylene naphthalate as constituent.

As above-mentioned glass baseplate, for example, the glass base such as soda-lime-silica glass, borosilicate glass, alkali-free glass Material.

Wherein, it is excellent from the viewpoint of retardance and it is easy it is Nian Jie with polarizer, preferred cellulose acylate substrate, The more preferable triacetyl cellulose substrate (TAC substrate) in cellulose acylate substrate.Triacetyl cellulose substrate is visible It can make the Mght-transmitting base material of 50% or more average transmittance in the 380~780nm in light region.Above-mentioned triacetyl cellulose base The average transmittance of material is 70% or more, more preferably 85% or more.

It should be noted that can also other than pure triacetyl cellulose as above-mentioned triacetyl cellulose substrate Think also shared as cellulose acetate-propionate, cellulose acetate-butyrate ingredient other than acetic acid as with cellulose shape Cellulose esters obtained from fatty acid at ester.In addition, can according to need in these triacetyl celluloses added with diacetyl The various additives such as other cellulose lower aliphatic esters such as cellulose or plasticizer, ultraviolet absorbing agent, lubricant.

From retardance and excellent heat resistance aspect, preferably cyclic olefin polymer substrate, in addition, from mechanical property and It sets out in terms of heat resistance, preferably polyester base material.

As the thickness of above-mentioned Mght-transmitting base material, it is not particularly limited, it can be for 5 μm or more and 1000 μm hereinafter, above-mentioned The lower limit of the thickness of Mght-transmitting base material is preferably 15 μm or more, more preferably 25 μm or more from treatability and etc..It is above-mentioned The upper limit of the thickness of Mght-transmitting base material is preferably 80 μm or less from filming aspect.

In optical film of the invention, preferably has and be mixed in the interface portion of above-mentioned Mght-transmitting base material and optical layer Having above-mentioned Mght-transmitting base material and containing weight average molecular weight is resin of 1000 photopolymerization monomers below as monomeric unit It is mixed in region.By being mixed in region with above-mentioned, it can be realized and caused by the reflection of the interface of above-mentioned Mght-transmitting base material and optical layer Interference fringe inhibition.

Above-mentioned photopolymerization monomer and the weight contained in the aftermentioned binder resin of optical layer as monomeric unit Average molecular weight is that 1000 photopolymerization monomers below are identical monomer.

As the above-mentioned thickness for being mixed in region, preferably 0.01 μm or more and 1 μm or less.Optical film of the invention and with touching The display device for controlling panel can be adequately suppressed the generation of interference fringe using the aftermentioned male and fomale(M&F) of optical layer, therefore, i.e., Make also to be able to suppress the generation of interference fringe in the case where the above-mentioned thickness for being mixed in region is so thin.It should be noted that existing Have well known antireflection film also by formed with it is above-mentioned be mixed in region and be similarly mixed in region inhibit interference fringe, but existing public affairs The thickness thickness for being mixed in region formed in the antireflection film known up to 3 μm or more, in the present invention thickness for being mixed in region that is formed with Formed in existing antireflection film be mixed in region compared to can be described as it is sufficiently thin.

In addition, by formed it is above-mentioned be mixed in region, the adaptation of Mght-transmitting base material and optical layer can be further increased.

It should be noted that as described above, can sufficiently inhibit the generation of interference fringe by the male and fomale(M&F) of optical layer, because This, can not also form in optical film and such be mixed in region.Even if it is this it is not formed be mixed in region in the case where, also can The generation for inhibiting interference fringe, therefore, even the difficulty such as acrylic substrate, cyclic olefin polymer substrate, polyester base material Be mixed in the substrate in region to be formed, can also be used as Mght-transmitting base material come using.

As above-mentioned optical layer, for example, playing antireflection, hard painting propert, anti-glare, antistatic property or antifouling The layer etc. of the functions such as property.

In the case where above-mentioned optical layer is also to play the layer of hard painting propert other than antireflection, optical layer preferably has With the hardness more than " H " in the pencil hardness test (4.9N load) of JIS K5600-5-4 (1999) defined.

The surface of above-mentioned optical layer is the male and fomale(M&F) for being formed with concaveconvex shape as described above.It should be noted that above-mentioned " light The surface of layer " refers to the face with face (back side of optical layer) opposite side of Mght-transmitting base material side in optical layer.

In addition, internal haze value is clear to transmission image if internal haze value is in 0% or more and 5% or less range Clear degree does not influence, and therefore, transmission image definition is influenced by the concaveconvex shape on the surface of optical film.On the other hand, originally In invention, the surface of optical film becomes the male and fomale(M&F) of optical layer.Therefore, in the present invention, the transmission image definition of optical film is It is no to meet above-mentioned formula (1) and formula (2) is determined by the concaveconvex shape of the male and fomale(M&F) of optical layer.It should be noted that hereinafter, by optics The male and fomale(M&F) that film meets the optical layer of above-mentioned formula (1) and formula (2) is known as " special male and fomale(M&F) ".

In addition, same as above-mentioned reason, if internal haze value in 0% or more and 5% or less range, optical film Internal haze influence is produced without on dazzle, therefore, in the case where internal haze within the above range, the table of optical film The concaveconvex shape in face influences the generation of dazzle.Hereinafter, for the male and fomale(M&F) of the optical film for meeting above-mentioned condition in the present invention Referred to as " special male and fomale(M&F) ".

Above-mentioned special male and fomale(M&F) can be by suitably adjusting concave-convex quantity, concave-convex size or inclination angle of bumps etc. It is formed, as the method that these are adjusted, for example, using the light containing formation binder resin after solidify The method etc. that the optical layer of polymerizable compound and particle forms male and fomale(M&F) with composition.

In the method for above-mentioned formation male and fomale(M&F), when photopolymerizable compound polymerize (crosslinking) and forms binder resin, There is no the part of particle, photopolymerizable compound is cured contraction, therefore generates contraction on the whole.In contrast, it is depositing In the part of particle, particle is not cured contraction, therefore the photopolymerizable compound for being only present in particle or more occurs admittedly Change and shrinks.There is the part of particle as a result, with there is no compared with the part of particle, the film thickness of optical layer thickens, thus optical layer Surface become male and fomale(M&F).Therefore, by proper choice of the type and tune of the type of particle, partial size and photopolymerizable compound Film formation condition is saved, the optical layer with special male and fomale(M&F) is capable of forming.

Above-mentioned optical layer preferably comprises binder resin and particle and is formed by above-mentioned method.

Above-mentioned binder resin contains the polymer of photopolymerizable compound (cross-linking agent).

Above-mentioned binder resin can also contain molten other than contains the polymer of photopolymerizable compound (cross-linking agent) Agent drying type resin, thermosetting resin.

Above-mentioned photopolymerizable compound at least contains 1 optical polymerism functional group.It should be noted that in this specification " optical polymerism functional group " is the functional group for referring to inject row polymerization reaction by illumination.

As such optical polymerism functional group, for example, the alkene such as (methyl) acryloyl group, vinyl, allyl Keyed double bond.It should be noted that the meaning of " (methyl) acryloyl group " include " acryloyl group " and " methylacryloyl " this The two.

In addition, as the light that irradiates when polymerizeing above-mentioned photopolymerizable compound, luminous ray and ultraviolet can be enumerated The ionizing rays such as line, X-ray, electron ray, alpha ray, β ray and gamma-rays.

As above-mentioned photopolymerizable compound, for example, photopolymerization monomer, optical polymerism oligomer or light are poly- Conjunction property polymer can carry out appropriate adjust to use to them.

As above-mentioned photopolymerizable compound, preferably photopolymerization monomer polymerize with optical polymerism oligomer or optical polymerism The combination of object.It should be noted that formed it is above-mentioned be mixed in region in the case where, as photopolymerizable compound, at least contain Photopolymerization monomer.

Above-mentioned photopolymerization monomer is preferably that weight average molecular weight is 1000 photopolymerization monomers below.By making above-mentioned light The weight average molecular weight of polymerizable monomer is 1000 hereinafter, can make photopolymerization monomer and penetrate into the solvent in Mght-transmitting base material It penetrates into Mght-transmitting base material together.It is formed about and is used for thereby, it is possible to the interface of the optical layer in above-mentioned Mght-transmitting base material Mitigate the refractive index of the Mght-transmitting base material and optical layer, be mixed Mght-transmitting base material and containing the photopolymerization monomer make Region is mixed in for the resin of monomeric unit.It should be noted that one kind can be used only in such photopolymerization monomer, it can also It is two or more to use.

As above-mentioned photopolymerization monomer, more officials of the optical polymerism functional group of 2 (i.e. two functions) or more are preferably comprised It can monomer.

As monomer more than above-mentioned two function, for example: trimethylolpropane tris (methyl) acrylate, three Propylene glycol two (methyl) acrylate, diethylene glycol two (methyl) acrylate, dipropylene glycol two (methyl) acrylate, season penta Tetrol three (methyl) acrylate, pentaerythrite four (methyl) acrylate, dipentaerythritol six (methyl) acrylate, 1,6- Hexylene glycol two (methyl) acrylate, neopentyl glycol two (methyl) acrylate, trimethylolpropane tris (methyl) acrylate, Double trimethylolpropane four (methyl) acrylate, dipentaerythritol five (methyl) acrylate, tripentaerythritol eight (methyl) Acrylate, tetrapentaerythritol ten (methyl) acrylate, isocyanuric acid three (methyl) acrylate, isocyanuric acid two (methyl) It is acrylate, polyester three (methyl) acrylate, polyester two (methyl) acrylate, bis-phenol two (methyl) acrylate, double sweet Oily four (methyl) acrylate, two (methyl) acrylic acid Buddha's warrior attendant alkyl esters, two (methyl) isobornyl acrylates, bicyclopentane two (methyl) acrylate, tristane two (methyl) acrylate, (methyl) acrylate of double trimethylolpropane four or by it With PO, EO etc. it is modified obtained from monomer.

Wherein, from the viewpoint of obtaining optical layer with high hardness, preferably pentaerythritol triacrylate (PETA), two seasons Penta tetrol, six acrylate (DPHA), pentaerythritol tetraacrylate (PETTA), Dipentaerythritol Pentaacrylate (DPPA) Deng.

The weight average molecular weight of above-mentioned optical polymerism oligomer is more than 1000 and is 10000 or less.

As above-mentioned optical polymerism oligomer, more than preferably two functions multifunctional oligomer, preferably optical polymerism function The multifunctional oligomer that group is 3 (trifunctional) or more.

As above-mentioned multifunctional oligomer, for example: polyester (methyl) acrylate, carbamate (methyl) Acrylate, polyester-urethane (methyl) acrylate, polyethers (methyl) acrylate, polyalcohol (methyl) acrylic acid Ester, melamine (methyl) acrylate, isocyanuric acid ester (methyl) acrylate, epoxy (methyl) acrylate etc..

The weight average molecular weight of above-mentioned optical polymerism polymer is more than 10,000, as weight average molecular weight, preferably greater than 10,000 and be 8 Ten thousand hereinafter, more preferably above 10,000 and be 40,000 or less.In the case where weight average molecular weight is more than 80,000, viscosity is high, therefore is coated with suitable Conjunction property reduces, and the appearance of obtained optical film is possible to deteriorate.

As above-mentioned multifunctional polymer, carbamate (methyl) acrylate, isocyanuric acid ester (first can be enumerated Base) acrylate, polyester-urethane (methyl) acrylate, epoxy (methyl) acrylate etc..

Above-mentioned solvent-dry type resin is only to be added and making thermoplastic resin etc. when being coated in order to adjust solid component The solvent seasoning that adds and the resin for forming overlay film.In the case where being added with solvent-dry type resin, when forming optical layer, energy Enough it is effectively prevented the overlay film defect of the coated face of masking liquid.It as solvent-dry type resin, is not particularly limited, can usually make Use thermoplastic resin.

As above-mentioned thermoplastic resin, for example: phenylethylene resin series, (methyl) acrylic resin, acetic acid Vinyl acetate system resin, vinyl ethers system resin, halogen-containing resin, ester ring type olefin-based resin, polycarbonate-based resin, polyester It is resin, polyamide resin, cellulose derivative, organic silicon-type resin and rubber or elastomer etc..

Above-mentioned thermoplastic resin preferably (can especially dissolve of more than two kinds poly- amorphism and dissolvable in organic solvent Close the shared solvent of object, curability compound).Especially from the viewpoint of the transparency, weatherability, optimization styrene system tree Rouge, (methyl) acrylic resin, ester ring type olefin-based resin, polyester based resin, cellulose derivative (cellulose esters etc.) Deng.

It as above-mentioned heat-curing resin, is not particularly limited, for example, phenolic resin, carbamide resin, adjacent benzene two Formic acid diallyl phthalate resin, melamine resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, ammonia Based alkyd, melamine-urea formaldehyde co-condensation resin, silicone resin, polyorganosiloxane resin etc..

Above-mentioned particle can be any one in inorganic particles or organic fine particles, wherein preferably such as silica (SiO₂) particle, alumina particulate, titanium dioxide fine particles, tin oxide particles, antimony dopant tin oxide (abbreviation ATO) particle, oxygen Change the inorganic oxide particles such as zinc particle.Above-mentioned inorganic oxide particle can form condensate in optical layer, solidifying according to this The cohesion degree of aggressiveness, is capable of forming special male and fomale(M&F).

As above-mentioned organic fine particles, for example, plastic bead.As the concrete example of plastic bead, polyphenyl second can be enumerated Alkene pearl, melamine resin pearl, acrylic resin pearl, acrylic resin-styrene beads, organic silica bead, benzoguanamine pearl, Benzoguanamine-formaldehyde condensation pearl, polycarbonate pearl, polyethylene beads etc..

Above-mentioned organic fine particles preferably to possessed by the particle in above-mentioned cure shrinkage fight cure shrinkage resistance into Appropriate adjusting is gone.In order to adjust the resistance to anti-shrink, preferably pre-production contains by changing three-dimensional cross-linked degree And a variety of optical films of the different organic fine particles of manufactured hardness, the transmission image definition of optical film is evaluated, thus Select the crosslinking degree for suitably forming special male and fomale(M&F).

In the case where using inorganic oxide particles as above-mentioned particle, preferably inorganic oxide particles implement surface Processing.By the way that distribution of the particle in optical layer can be suitably controlled to the implementation surface treatment of above-mentioned inorganic oxide particle, Also, the chemical resistance and resistance to saponifiability of particle itself can also be improved.

As above-mentioned surface treatment, preferably make the hydrophobic silicic acid anhydride in the surface of particle.At such hydrophobization Reason can be chemically reacted and be realized by the surface treating agent and the surface of particle for making silanes, silazane class etc..As Specific surface treating agent, for example, dimethyldichlorosilane, silicone oil, hexamethyldisilazane, octyl silane, 16 Alkyl silane, amino silane, methacryl silanes, octamethylcy-clotetrasiloxane, dimethyl silicone polymer etc..It is nothing in particle In the case where machine oxide fine particle, on the surface of inorganic oxide particle, there are hydroxyls, but as described above hydrophobic by implementing Change processing, the hydroxyl for being present in the surface of inorganic oxide particle are reduced, the ratio of inorganic oxide particle measured by BET method Surface area reduces, while being able to suppress inorganic oxide particle and excessively agglomerating, and being capable of forming has the function of special male and fomale(M&F) Layer.

In the case where using inorganic oxide particles as above-mentioned particle, preferably inorganic oxide particle is amorphous state. This is because in the case where inorganic oxide particles are crystalline situation, it is inorganic due to the lattice defect for including in its crystal structure The lewis acid of oxide fine particle enhances, it is possible to be unable to control the excessive cohesion of inorganic oxide particle.

The content of above-mentioned optical layer is not particularly limited in particle phase, preferably 0.1 mass % or more and 5.0 mass % Below.Since the content of particle is 0.1 mass % or more, special male and fomale(M&F) can be formed more reliably, in addition, due to The content of particle is 5.0 mass % hereinafter, therefore will not excessively generate condensate, is able to suppress internal diffusion and/or in function The surface of layer generates big bumps, and thus, it is possible to inhibit gonorrhoea sense.The lower limit of fraction of particle is more preferably 0.2 mass % or more, The upper limit of fraction of particle is more preferably 3.0 mass % or less.

Shape of the above-mentioned particle preferably under individual particle state is spherical.By the such ball of individual particle for making particle Shape can obtain the excellent image of contrast when optical film to be configured to the picture display face of image display device.Here, The meaning of " spherical " include such as it is just spherical, oval it is spherical, but do not include so-called unbodied particle.

In the case where using organic fine particles as above-mentioned particle, go out from the viewpoint for the diffusion for inhibiting the light as caused by particle Hair preferably reduces the refractive index of above-mentioned particle and binder resin by changing the copolymerization ratios of the different resin of refractive index Difference, such as make refringence less than 0.01.The average primary particle diameter of organic fine particles is preferably smaller than 8.0 μm, more preferably 5.0 μm with Under.

Above-mentioned optical layer is preferably the optical layer that the use in the above method forms the particle of loose condensate and formed. " loose condensate " refers to following condensate: the condensate of particle is not bulk, is had comprising passing through primary particle phase The structure of the buckling portion and the inside region by buckling portion clamping that are even formed.Here, " buckling portion " is also to wrap in this specification Include the concept including bending section.As the shape with buckling portion, for example, V shape, U-shaped, arc-shaped, C-shaped, Coiling-type, caged etc..The both ends of above-mentioned buckling portion can be closed, for example, can be the cyclic structure with buckling portion.

Above-mentioned buckling portion can be formed and 1 particle coagulation body of buckling is constituted by being connected by primary particle, can also It is formed with being branched off with from stem portion and being connected by primary particle by the stem portion formed that is connected by primary particle Branch portion constitute, furthermore it is also possible to by be branched off from stem portion and stem portion connection 2 branch portions constitute.It is above-mentioned " stem portion " refers to longest part in the condensate of particle.

Above-mentioned inside region is filled by binder resin.Above-mentioned buckling portion is preferably out of the thickness direction of optical layer clamping The mode of side region exists.

Cohesion is that the cure shrinkage for the photopolymerizable compound that conglomeration body forms binder resin after hardening is (poly- Close shrink) when work as single solid, therefore, the male and fomale(M&F) of optical layer and the shape of condensate are corresponding.In contrast, The condensate that particle loosely agglomerates has buckling portion and is therefore made in cure shrinkage by the inside region that buckling portion clamps It works for the solid with buffer function.Therefore, the condensate that particle loosely agglomerates in cure shrinkage can easily and With uniformity collapse.To be gentle compared with when the shape of male and fomale(M&F) and particle coagulation are bulk as a result, in addition, it is not easy to Locally generating big concaveconvex shape.

In the case where above-mentioned optical layer is formed by the condensate loosely agglomerated, can also be adjusted by adjusting film thickness The size of the condensate loosely agglomerated.That is, the size of the condensate loosely agglomerated is easy to become much larger when film thickness is big.By This, can make concave-convex size bigger, make concave-convex wider interval.

In addition, as the particle for forming loose condensate, such as preferred average primary particle diameter is 1nm or more and 100nm Inorganic oxide particle below.Since the average primary particle diameter of particle is 1nm or more, can be more easily formed has The optical layer of special male and fomale(M&F), in addition, since average primary particle diameter is that 100nm is caused by particle hereinafter, being therefore able to suppress Light diffusion, excellent dark contrast can be obtained.The lower limit of the average primary particle diameter of particle is more preferably 5nm or more, micro- The upper limit of the average primary particle diameter of grain is more preferably 50nm or less.It should be noted that the average primary particle diameter of particle is to use Image processing software from section electron microscope (preferably the transmission-types such as TEM, STEM and multiplying power be 50,000 times or more section electronics Microscope) image in the value that measures.

In the case where using inorganic oxide particle as the particle for forming above-mentioned loose condensate, preferred optical layer Male and fomale(M&F) bumps only caused by inorganic oxide particle, formed." bumps of the male and fomale(M&F) of optical layer are only by inorganic oxide Particle causes, is formed " it is expressed as follows meaning: it does not substantially include the bumps of the male and fomale(M&F) of optical layer in addition to micro- by inorganic oxide Grain cause other than, the case where also being caused, formed by the particle other than inorganic oxide particle.It is described herein " not wrap substantially Include " it is expressed as follows meaning: other particles are the concave-convex particle for not forming the male and fomale(M&F) of optical layer, even if alternatively, if being formed Bumps nor affect on few amount of antireflection, then optical layer can also be micro- containing other other than inorganic oxide particle Grain.

In above-mentioned inorganic oxide particle, from being capable of forming loose condensate, be able to easily form special bumps From the perspective of face, particularly preferred fumed silica.

Above-mentioned fumed silica is the amorphous state titanium dioxide with 200nm partial size below made by dry method Silicon can be obtained by reacting the volatile compound containing silicon in the gas phase.Specifically, for example, Make silicon tetrachloride (SiCl₄) etc. silicon compounds be hydrolyzed in the flame of oxygen and hydrogen and the fumed silica that generates Deng.As the commercially available product of above-mentioned fumed silica, for example, the AEROSIL of NIPPON AEROSIL company manufacture R805 etc..

Above-mentioned fumed silica shows hydrophilic fumed silica and shows hydrophobic gas phase Method silica, wherein reduce from moisture absorption generation rate, the easily dispersible viewpoint in functional layer composition, it is excellent Choosing shows hydrophobic fumed silica.

Hydrophobic fumed silica can be by making surface treating agent and fumed silica as described above Surface present on silanol group chemically reacted to obtain.From the viewpoint of being easy to get above-mentioned condensate, most It is preferred that fumed silica has been carried out octyl silane treatment.

The BET specific surface area of above-mentioned fumed silica is preferably 100m²/ g or more and 200m²/ g or less.By making gas The BET specific surface area of phase method silica is 100m²/ g or more, fumed silica will not excessively disperse, easy to form suitable The condensate of degree, in addition, the BET specific surface area 200m by making fumed silica²/ g is hereinafter, fumed silica It is not easy to form excessive condensate.The lower limit of the BET specific surface area of fumed silica is more preferably 120m²/ g, further Preferably 140m²/g.The upper limit of the BET specific surface area of fumed silica is more preferably 180m²/ g, further preferably 165m²/g。

Such optical layer can for example be formed by the following method.

Firstly, being coated with following optical layer composition on the surface of above-mentioned Mght-transmitting base material.

As the method for being coated with above-mentioned optical layer composition, for example, spin coating, infusion process, spray coating method, slope stream Coating method well known to rubbing method, stick coating method, rolling method, gravure printing method, die coating method etc..

Above-mentioned optical layer composition at least contains above-mentioned photopolymerizable compound and above-mentioned particle.Furthermore, it is possible to according to It needs in optical layer with adding above-mentioned thermoplastic resin, above-mentioned heat-curing resin, solvent, polymerization initiator in composition.Into And can be according to improving the hardness of optical layer, inhibiting cure shrinkage, control refractive index the purpose of, in optical layer composition Add conventionally known dispersing agent, surfactant, antistatic agent, silane coupling agent, thickener, anti-coloring agent, colorant (face Material, dyestuff), defoaming agent, levelling agent, fire retardant, ultraviolet absorbing agent, tackifiers, polymerization inhibitor, antioxidant, surface modifier, Lubricant etc..

Above-mentioned solvent can be used for following purpose: carry out to make above-mentioned optical layer be easy to be coated with composition to viscosity It adjusts；Evaporation rate, the dispersibility to particle are adjusted, the cohesion degree of particle when adjusting optical layer formation, to be easily formed Special male and fomale(M&F).

As such solvent, such as may be exemplified: alcohol (such as methanol, ethyl alcohol, propyl alcohol, isopropanol, n-butanol, Zhong Ding Alcohol, the tert-butyl alcohol, benzyl alcohol, PGME, ethylene glycol), ketone (acetone, methyl ethyl ketone (MEK), cyclohexanone, methyl iso-butyl ketone (MIBK), Diacetone alcohol, cycloheptanone, metacetone etc.), ethers (1,4- dioxanes, dioxolanes, tetrahydrofuran etc.), aliphatic hydrocarbon (hexane etc.), ester ring type hydro carbons (hexamethylene etc.), aromatic hydrocarbon (toluene, dimethylbenzene etc.), halogenated hydrocarbon (methylene chloride, two Chloroethanes etc.), esters (methyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, ethyl lactate etc.), molten fibre Agent class (methyl cellosolve, ethyl cellosolve, butyl cellosolve etc.), oxolane, sulfoxide type (dimethyl sulfoxide etc.), Amides (dimethylformamide, dimethyl acetamide etc.) etc., or their mixture.

In addition, in the case where being formed about at the interface of Mght-transmitting base material and optical layer as described above and being mixed in region, It is molten using permeability high containing the permeability to Mght-transmitting base material, making Mght-transmitting base material dissolve or be swollen as above-mentioned solvent The solvent of agent, meanwhile, it the use of at least contain weight average molecular weight is 1000 optical polymerism lists below as photopolymerizable compound The photopolymerizable compound of body.

By using above-mentioned penetrating solvents and photopolymerization monomer, not only penetrating solvents penetrate into Mght-transmitting base material In, photopolymerization monomer also penetrates into Mght-transmitting base material, therefore, can be in shape near the interface of Mght-transmitting base material and optical layer Region is mixed at being mixed Mght-transmitting base material and containing photopolymerization monomer as the resin of monomeric unit.

As above-mentioned penetrating solvents, for example: ketone (acetone, methyl ethyl ketone (MEK), cyclohexanone, methyl Isobutyl ketone, diacetone alcohol, cycloheptanone, metacetone), esters (methyl formate, methyl acetate, ethyl acetate, propyl acetate, Butyl acetate, ethyl lactate etc.), ethers (1,4- dioxanes, dioxolanes, tetrahydrofuran etc.), dioxane (the molten fibre of methyl Agent, ethyl cellosolve, butyl cellosolve etc.), oxolane, sulfoxide type (dimethyl sulfoxide etc.), phenols (phenol, neighbour Chlorophenol) etc..Alternatively, it is also possible to the mixture for them.Use triacetyl cellulose substrate as the feelings of Mght-transmitting base material Under condition, wherein as penetrating solvents, for example, it is preferable to selected from by methyl iso-butyl ketone (MIBK), methyl ethyl ketone, cyclohexanone, acetic acid first Ester, ethyl acetate, propyl acetate, butyl acetate composition at least one of group solvent, in addition, use polyester base material as In the case where Mght-transmitting base material, preferred o-chlorphenol.

Above-mentioned polymerization initiator is to decompose occur by light irradiation, generate free radicals and cause or carry out optical polymerism chemical combination The ingredient of the polymerization (crosslinking) of object.

As long as such polymerization initiator can be released through the substance that light irradiation causes free radical polymerization, without special Limit, conventionally known polymerization initiator can be used, as concrete example, for example, acetophenones, benzophenone, Michaelis benzoylbenzoic acid ester, α-amyl oxime ester, thioxanthene ketone class, phenylpropyl alcohol ketone class, benzil class, benzoin class, acylphosphine oxide Class.Additionally, it is preferred that mixing photosensitizer is come using as its concrete example, for example, n-butylamine, triethylamine, poly- normal-butyl Phosphine etc..

It is the resin with free-radical polymerised unsaturated group in above-mentioned binder resin as above-mentioned polymerization initiator In the case where system, acetophenones, benzophenone, thioxanthene ketone class, benzoin, benzoin methylether is preferably used alone or as a mixture Deng.

Optical layer is preferably relative to 100 mass parts of photopolymerizable compound with the content of the polymerization initiator in composition More than 0.5 mass parts and 10.0 below the mass.Content by making polymerization initiator in the range, can substantially ensure hard Performance is applied, and is able to suppress solidification and hinders.

As the content ratio (solid component) of the raw material in optical layer composition, it is not particularly limited, it is usually preferred to For 5 mass % or more and 70 mass % hereinafter, more preferably 25 mass % or more and 60 mass % or less.

As above-mentioned levelling agent, for example, the avoidable optical layer such as silicone oil, fluorine class surfactant forms Bei Nade whirlpool knot Structure, therefore preferably.In the case where being coated with the resin combination containing solvent and drying, in film coated surface and inner face in film Surface tension difference etc. is generated, most convection current is thus caused in film.Bei Nade whirlpool is referred to as by the structure that the convection current generates Vortex structure becomes and occurs the reason of the problems such as orange peel, coating defects in being formed by optical layer.

Above-mentioned shellfish Nader eddy structure is there is a possibility that the bumps on the surface of optical layer become excessive.Use above-mentioned levelling agent When, the convection current can be prevented, therefore, can not only obtain no defect, uneven optical layer, and be easy to optical layer The concaveconvex shape on surface is adjusted.

As the preparation method of above-mentioned optical layer composition, without special as long as each ingredient equably can be mixed It limits, device well known to paint shaker, ball mill, kneader, mixer etc. can be used for example to carry out.

After the surface coated optical layer composition of above-mentioned Mght-transmitting base material, it is transported to the optical layer in order to make coating It is dried with composition in the section that heats, is dried with composition optical layer by various well known methods, evaporates solvent. Here, by selection solvent relative evaporation speed, solid component concentration, coating fluid temperature, drying temperature, dry wind wind speed, Drying time, solvent atmosphere concentration of arid region etc., the state of aggregation of adjustable particle, distribution.

The method that the distribution of particle is adjusted especially by selection drying condition is easy thus preferred.

For example, slowing down rate of drying by reducing drying temperature and/or reducing dry wind speed, particle becomes more as a result, It is easy cohesion, it therefore, being capable of the wide shape in the big and concave-convex interval of bumps easy to form.

As specific drying temperature, preferably 30~120 DEG C, dry wind speed is preferably 0.2~50m/s, by carrying out 1 The distribution of particle, can be adjusted to desired by drying process that is secondary or repeatedly having carried out appropriate adjusting in the range State.

In addition, penetrating into the penetrating solvents evaporation in Mght-transmitting base material, but light is poly- when being dried with composition optical layer Conjunction property compound remains in Mght-transmitting base material.

Then, the light such as ultraviolet light are irradiated to the optical layer of coating composition, photopolymerizable compound is polymerized (hands over Connection), thus solidify optical layer with composition, forms optical layer, be formed simultaneously and be mixed in region.

In the case where using ultraviolet light as light when solidifying above-mentioned optical layer composition, can use by superelevation The ultraviolet light etc. of the sendings such as pressure mercury lamp, high-pressure sodium lamp, low pressure mercury lamp, carbon arc lamp, xenon arc lamp, metal halide lamp.In addition, conduct The wave band of 190~380nm can be used in the wavelength of ultraviolet light.As the concrete example of electronic radial source, cock sieve husband can be enumerated Te-Wa Erdun (Cockcroft-Walton) type, Van de Graaff type, resonance transformer type, insulating core transformer typ or straight Line style, that rice (Dynamitron) type, high-frequency type etc. various electron ray accelerators.

Bonding is formed it should be noted that can also be used as by using photopolymerizable compound and solvent-dry type resin The material of agent resin forms the optical layer with special male and fomale(M&F).

Specifically, for example, using the optical layer group containing photopolymerizable compound, solvent-dry type resin and particle Object is closed, forms the film of optical layer composition on Mght-transmitting base material by method same as described above, as described above Solidify optical layer with composition.

Sharing the feelings of photopolymerizable compound and solvent-dry type resin as the material for forming above-mentioned binder resin Under condition, compared with the case where photopolymerizable compound is used only, viscosity can be improved, in addition, can reduce cure shrinkage (polymerization Shrink), therefore, when dry and when solidification, the male and fomale(M&F) of optical layer will not follow the shape of particle and be formed, and be capable of forming spy Different male and fomale(M&F).Wherein, film thickness etc. of the concaveconvex shape of the male and fomale(M&F) of optical layer by optical layer is influenced, therefore, even if In the case where forming optical layer using such method, it is also required to suitably adjust film thickness of optical layer etc. certainly.

In addition, as long as above-mentioned optical layer meets above-mentioned formula (1) and formula (2), both can be 1 layer of structure in the present invention, It can be 2 layers or more of multilayered structure, in addition, in the present invention, as long as above-mentioned optical layer meets above-mentioned apparent height distribution Half-peak breadth, the average curvature of concave-convex surface then both can be 1 layer of structure, or 2 layers or more of multilayered structure.

Specifically, optical layer can be by substrate buckle layer that surface is male and fomale(M&F) and to be formed on substrate buckle layer 2 layers of structure that surface conditioning layer is constituted.

Above-mentioned substrate buckle layer can be optical layer.

Above-mentioned surface conditioning layer is to obtain for filling the fine bumps existing for the surface of above-mentioned substrate buckle layer Smooth male and fomale(M&F), and/or the layer for interval concave-convex existing for the surface in buckle layer, size etc. to be adjusted.On The surface for stating surface conditioning layer is formed as male and fomale(M&F), and the male and fomale(M&F) of the surface conditioning layer forms special male and fomale(M&F).Wherein, in light Learn in the case that layer is multilayered structure, manufacturing process becomes complicated, in addition, the management of manufacturing process when 1 layer of structure compared with can Can be more difficult, therefore preferably optical layer is 1 layer of structure.

From the viewpoint of adjusting bumps, the film thickness of above-mentioned surface conditioning layer is preferably 0.5 μm or more and 20 μm or less.Table The upper limit of the film thickness of face regulating course is more preferably 12 μm hereinafter, further preferably 8 μm or less.Under the film thickness of surface conditioning layer Preferably 3 μm or more of limit.

The above-mentioned optical layer being made of substrate buckle layer and surface conditioning layer can be used substrate buckle layer composition and Surface conditioning layer uses composition as optical layer composition, is formed by the following method.

As above-mentioned substrate buckle layer composition, it can be used and illustrate in the part of above-mentioned optical layer composition The same composition of optical layer composition crossed.In addition, as surface conditioning layer composition, can be used at least containing with The composition of the same photopolymerizable compound of the photopolymerizable compound illustrated in the part of above-mentioned binder resin.Table Face regulating course composition in addition to containing other than photopolymerizable compound, can containing in the portion of above-mentioned optical layer composition The same levelling agent of levelling agent, solvent, the solvent etc. illustrated in point.

When forming the above-mentioned optical layer including substrate buckle layer and surface conditioning layer, firstly, being applied on Mght-transmitting base material Cloth substrate buckle layer composition forms the film of substrate buckle layer composition on Mght-transmitting base material.

Then, by after the dried coating film, to light such as film irradiation ultraviolet lights, photopolymerizable compound is polymerized (crosslinking), Solidify substrate buckle layer with composition, forms substrate buckle layer.

Then, the coating surface regulating course composition on substrate buckle layer forms the painting of surface conditioning layer composition Film.Then, by after the dried coating film, to light such as film irradiation ultraviolet lights, photopolymerizable compound is polymerized (crosslinking), thus makes Surface conditioning layer is solidified with composition, forms surface conditioning layer.Even if not using the particle for forming loose condensate as a result, Also it is capable of forming the optical layer with special male and fomale(M&F).Wherein, the concaveconvex shape of the male and fomale(M&F) of optical layer is also by film The influence of the film thickness of drying condition and substrate buckle layer and surface conditioning layer etc., therefore, even if in shape by such method In the case where at optical layer, it is also required to the drying condition and substrate buckle layer and the film thickness of surface conditioning layer etc. to film certainly Suitably adjusted.

The full light transmittance of above-mentioned optical film is preferably 85% or more.When full light transmittance is 85% or more, inciting somebody to action In the case that optical film is assembled on the surface of image display device, color reprodubility and visuality can be further increased.On It states full light transmittance and is more preferably 90% or more.Haze meter (color technical research institute in village can be used in full light transmittance Manufacture, product number: HM-150) by being measured based on the method for JIS K7361.

In the surface of above-mentioned optical film, the concave-convex three-dimensional average slope angle θ a on the surface is constituted_3DPreferably 0.12 ° or more And 0.5 ° hereinafter, more preferably 0.15 ° or more and 0.4 ° or less.

In the surface of above-mentioned optical film, constitute the surface concave-convex average peak interval Smp be preferably 0.05mm or more and 0.3mm is hereinafter, more preferably 0.10mm or more and 0.25mm or less.

In the surface of above-mentioned optical film, the concave-convex arithmetic average roughness Ra for constituting the surface is preferably 0.01 μm or more And 0.11 μm hereinafter, more preferably 0.035 μm or more and 0.08 μm or less.

In the surface of above-mentioned optical film, the 10 concave-convex mean roughness Rz for constituting the surface are preferably 0.10 μm or more And 0.30 μm hereinafter, more preferably 0.12 μm or more and 0.28 μm or less.

Above-mentioned " θ a_3D", " Smp ", " Ra " and " Rz " can be by passing through contact surface roughness meter or non-contact surface The three-dimensional roughness curved surface that the measurement of roughmeter (for example, interference microscope, Laser Scanning Confocal Microscope, atomic force microscope etc.) obtains It is calculated.The data of above-mentioned three-dimensional roughness curved surface, which pass through, is matched in datum level (transverse direction is made to be x-axis, be longitudinally y-axis) with interval d The height of the point of clathrate and the position of the point is set to indicate.

That is, by the height of j-th point of position (hereinafter referred to as (i, j)) is set as i-th in x-axis direction, on y-axis direction Z_i,jWhen, in arbitrary position (i, j), x-axis direction is as follows relative to the slope S y of y-axis relative to the slope S x of x-axis, y-axis direction It calculates.

Sx=(Z_i+1,j-Z_i-1,j)/2d

Sy=(Z_i,j+1-Z_i,j-1)/2d

In addition, (i, j) is calculated relative to the slope S t of datum level by following formula.

[number 3]

Also, the tilt angle of (i, j) passes through tan^-1(St) it calculates.

From simplicity, it is preferable to use interference microscopes for above-mentioned three-dimensional roughness curved surface to measure.As such dry Microscope is related to, for example, " New View " series etc. of Zygo company manufacture.

Also, above-mentioned three-dimensional average slope angle θ a_3DIt is calculated by the average value of the tilt angle of each point.

In addition, the average peak interval Smp of the above-mentioned bumps in the present invention is found out as follows.

By the part surrounded using in the part higher than datum level of above-mentioned three-dimensional roughness curved surface by a region as one When the number at peak when a peak is set as Ps, the area for measuring region entirety (datum level) is set as A, Smp is calculated by following formula.

[number 4]

In addition, the arithmetic average roughness Ra of the above-mentioned bumps in the present invention is the work that will be recorded in JIS B0601:1994 Obtained from the three-dimensional expansion of Ra progress for two-dimentional roughness parameter, orthogonal axis X, Y-axis are set in datum level, it will be coarse When the face of writing music is set as Z (x, y), the size of datum level is set as Lx, Ly, arithmetic average roughness Ra is calculated by following formula.

[number 5]

A=Lx × Ly

In addition, using above-mentioned Z_i,jWhen, the arithmetic average roughness Ra of above-mentioned bumps is calculated by following formula.

[number 6]

N: total points

Above-mentioned 10 mean roughness Rz in the present invention are that conduct two dimension that will record in JIS B0601:1994 is coarse The Rz for spending parameter is carried out obtained from three-dimensional expansion.

That is, in 360 degree of radial a plurality of centers from the datum level of setting in a manner of enlisting the services of gamut on datum level By straight line, obtain finding out on the cross section curve based on cross section curve made of each straight cuts as three-dimensional roughness curved surface 10 mean roughness (average value of the peak heights from highest summit according to sequence from high to low until the 5th With the sum of the average value of the paddy depth from most deep the lowest point according to sequence from deep to shallow until the 5th).To so obtaining Multiple 10 mean roughness in upper number 50% be averaged, thus calculate 10 mean roughness Rz.

In addition, can more suitably prevent from shining upon from optical film of the invention and the generation of generation, the watermark of Newton's ring From the perspective of, above-mentioned optical layer is preferably the structure that low-index layer is laminated on the buckle layer that surface has concaveconvex shape At.

As above-mentioned buckle layer, can enumerate by same as containing the above-mentioned optical layer of binder resin and particle The buckle layer that composition and method are formed.

Above-mentioned low-index layer is to play the layer acted on as follows: from external light (such as fluorescent lamp, natural light etc.) When the surface of optical film is reflected, the reflectivity is reduced.As low-index layer, preferably by 1) containing silica, fluorine Change the resin of low-refraction particles such as magnesium, 2) as the fluorine resin of low refractive index resin, 3) contain silica or magnesium fluoride Fluorine resin, 4) any one composition in film of the low-refractions substance such as silica, magnesium fluoride etc..About fluorine class tree Resin same as the above-mentioned binder resin of optical layer is constituted can be used in resin other than rouge.

In addition, above-mentioned silica is preferably hollow silica particles, such hollow silica particles are for example It can be made by the manufacturing method that the embodiment of Japanese Unexamined Patent Publication 2005-099778 bulletin is recorded.

The refractive index of these low-index layers is preferably 1.45 hereinafter, particularly preferably 1.42 or less.

In addition, the thickness of low-index layer does not limit, usually suitably set i.e. in the range of 30nm~1 μm or so It can.

In addition, above-mentioned low-index layer is that single layer can be obtained effect, but for lower minimum reflectivity or higher The purpose that is adjusted of minimum reflectivity, 2 layers or more of low-index layer also can be set.At 2 layers of above-mentioned setting or more In the case where low-index layer, preferably make the refractive index of each low-index layer and thickness that there is difference.

As above-mentioned fluorine resin, can be used at least in the molecule containing the polymerizable compound of fluorine atom or its polymerization Object.As polymerizable compound, be not particularly limited, for example, it is preferable to have using the cured functional group of ionizing ray progress, into The compound of the solidification reactivities group such as polar group of row heat cure.Alternatively, it is also possible to have both these reactive bases simultaneously The compound of group.Relative to the polymerizable compound, polymer is the compound for not having above-mentioned reactive group etc. completely.

As the above-mentioned polymerizable compound for having and carrying out cured functional group using ionizing ray, tool can be widely used There is the fluorochemical monomer of ethylenic bond unsaturated bond.More specifically, fluoroolefins (such as vinyl fluoride, inclined difluoro second be may be exemplified Alkene, tetrafluoroethene, hexafluoropropene, perfluorobutadiene, perfluor -2,2- dimethyl -1,3- dioxole etc.).As tool There is the fluorochemical monomer of (methyl) acryloxy, also (methyl) acrylic acid 2,2,2- trifluoro ethyl ester, (methyl) acrylic acid 2,2, Five fluorine propyl ester of 3,3,3-, (methyl) acrylic acid 2- (perfluoro butyl) ethyl ester, (methyl) acrylic acid 2- (perfluoro hexyl) ethyl ester, (first Base) acrylic acid 2- (perfluoro capryl) ethyl ester, (methyl) acrylic acid 2- (perfluoro decyl) ethyl ester, α-trifluoromethyl acrylate methyl esters, α-trifluoromethyl acrylate ethyl ester etc. is in the molecule with (methyl) acrylate compounds of fluorine atom；In the molecule containing tool There are fluoro-alkyl, fluoro naphthenic base or the fluorianted alkylene and at least two (first that the carbon atom number of at least three fluorine atom is 1~14 Base) acryloxy fluorinated polyfunctional (methyl) acrylate compounds etc..

As the polar group of above-mentioned carry out heat cure, for example, it is preferable to for hydrogen bonds shapes such as hydroxyl, carboxyl, amino, epoxy groups At group.These groups are but also also excellent with the compatibility of the inorganic ultra micron such as silica not only with the excellent adhesion of film It is different.As the polymerizable compound with Thermocurable polar group, for example, 4- vinyl fluoride-perfluoroalkyl vinyl Ether copolymer；Vinyl fluoride-hydro carbons vinyl ether co-polymer；The fluorine of each resin such as epoxy, polyurethane, cellulose, phenol, polyimides Modifier etc..

As it is above-mentioned have both using ionizing ray carry out cured functional group and carry out heat cure polar group polymerization Property compound, may be exemplified: the partially and fully fluoroalkyl of acrylic or methacrylic acid, alkenyl ester, aryl esters, Complete or partial fluorinated vinyl ethers, complete or partial fluorinated vinyl esters, complete or partial fluorinated vinyl ketone etc..

In addition, as fluorine resin, for example, following resin.

Fluorine-containing (methyl) propylene containing at least one above-mentioned polymerizable compound with ionizing ray curative group The monomer of ester compound or the polymer of monomer mixture；At least one of above-mentioned fluorine-containing (methyl) acrylate compounds With (methyl) methyl acrylate, (methyl) ethyl acrylate, (methyl) propyl acrylate, (methyl) butyl acrylate, (methyl) The copolymer of (methyl) acrylate compounds in the molecules such as 2-ethylhexyl acrylate without fluorine atom；Vinyl fluoride, inclined two Vinyl fluoride, trifluoro-ethylene, chlorotrifluoroethylene, 3,3,3- trifluoro propene, the chloro- 3,3,3- trifluoro propene of 1,1,2- tri-, hexafluoropropene Homopolymer or copolymer of equal fluorochemical monomers etc..Also it can be used and contain organosilicon containing silicone ingredients in these copolymers Vinylidene fluoride copolymer.It as silicone ingredients in this case, may be exemplified: (poly-) dimethyl siloxane, (poly-) two Ethylsiloxane, (poly-) methyl phenyl siloxane, alkyl-modified (poly-) dimethyl siloxane, contains occasionally (poly-) diphenyl siloxane Nitrogen base (poly-) dimethyl siloxane, dimethyl organosilicon, phenyl methyl organosilicon, the aralkyl modified organosilicon of alkyl-, fluorine are organic Silicon, aliphatic ester modified organic silicon, hydrogeneous poly- methylsiloxane, siliceous silane alcohol base organosilicon, contains alcoxyl at organic silicon modified by polyether Base organosilicon, organosilicon containing phenylol, acrylic modified organosilicon, acryl-modified silicone resin, amino-modified silicone, Carboxyl acid modified organosilicon, carbinol-modified organosilicon, epoxy modified silicone, sulfhydryl modified organosilicon, fluorine richness organosilicon, polyethers Modified organic silicon etc..Wherein, preferably with the silicone ingredients of dimethyl siloxane structural.

In addition it is also possible to use the non-polymer being made of following compounds or polymer as fluorine resin.I.e., it is possible to It uses: making that there is at least one amino, hydroxyl, carboxylic in the fluorochemical and molecule at least one isocyanate group in molecule Compound obtained from the compound reaction for the functional group that base etc. is reacted with isocyanate group；Make fluorine-containing polyether glycol, fluorine-containing The fluorine-containing polyalcohols such as alkyl polyols, fluorine-containing polyester polyol, fluorine-containing 6-caprolactone modified polyalcohol with have isocyanate group Compound reaction obtained from compound etc..

Alternatively, it is also possible to by each binder resin recorded in above-mentioned optical layer and the above-mentioned polymerism with fluorine atom Compound, polymer are used in mixed way together.Furthermore, it is possible to suitably use for making the cured curing agent such as reactive group, use In the various additives, the solvent that improve coating or imparting soil resistance.

In the formation of above-mentioned low-index layer, preferably make the low-index layer for adding low-refraction agent and resin etc. and formation With the viscosity of composition in 0.5~5mPas (25 DEG C), the preferably 0.7~3mPas (25 DEG C) that preferred coating can be obtained In range.It can be realized the excellent optical layer of luminous ray, further, it is possible to the uniform and film without crawling is formed, also, It is capable of forming the especially excellent low-index layer of adaptation.

The solidification means of resin can be identical as the solidification means illustrated in above-mentioned optical layer.In order to be consolidated Change processing using in the case where heating means, addition generates such as free radical by heating preferably in fluorine resin composition So as to cause the thermal polymerization of the polymerization of polymerizable compound.

Thickness (nm) d of low-index layer_APreferably satisfy following formula (A):

d_A=m λ/(4n_A) (A)

(in above-mentioned formula,

n_AIndicate the refractive index of low-index layer,

M indicates positive odd number, preferably indicates 1,

λ is wavelength, the value within the scope of preferably 480~580nm).

In addition, from the viewpoint of antiradar reflectivity, preferably low-index layer meets following formula (B) in the present invention:

120<n_Ad_A<145 (B)。

According to the present invention, the transmission image definition for the optical film for using the light comb of 0.125mm wide to measure is being set as C (0.125), when the transmission image definition for the optical film that the light comb for using 0.25mm wide measures being set as (0.25) C, optical film Meet above-mentioned formula (1) and formula (2), therefore, even if optical film has 0% or more and 5% low total mist degree below and has 0% or more and 5% low internal haze below is also able to suppress dazzle and inhibition is shone upon and watermark based on above-mentioned reason.

In addition, according to the present invention, the value for the half-peak breadth that the apparent height on the surface of optical film is distributed, above-mentioned concave-convex surface Average curvature when meeting above-mentioned specific numberical range, the concaveconvex shape on the surface of optical film becomes specific concaveconvex shape, Therefore, even if optical film is with 0% or more and 5% low total mist degree below and below low interior with 0% or more and 5% Portion's mist degree is also able to suppress dazzle and control watermark based on above-mentioned reason.

Here, total mist degree value and internal haze value are value when being integrally measured as optical film.

It should be noted that haze meter (HM-150, color skill in village can be used in above-mentioned total mist degree value and internal haze value Manufactured by art research) by being measured based on the method for JIS K7136.

Specifically, using haze meter according to the total mist degree value of JIS K7136 measurement optical film.

Then, on the surface of optical film, pasting triacetyl cellulose substrate by transparent optical adhesive layer, (Fujiphoto is public Department's manufacture, TD60UL).

The concaveconvex shape on the surface of optical film collapses as a result, and the surface of optical film becomes flat.

Then, in this state, using haze meter (HM-150, color technical research institute manufacture in village) according to JIS K7136 measures haze value, thus finds out internal haze value.

The internal haze when internal haze is the concaveconvex shape on the surface of non-Additional optical film.

In display device with touch panel of the invention, the total mist degree value of optical film is preferably 1% hereinafter, more preferably 0.3% or more and 0.5% or less.

Internal haze value is preferably essentially 0%.

Here, " internal haze value is essentially 0% " is not limited to the case where internal haze value is entirely 0%, meaning packet Even if containing internal haze value be greater than 0% but still in the range of evaluated error, internal haze value can be considered as substantially 0% range (for example, 0.3% internal haze value below).

In the total mist degree value of above-mentioned optical film be 0% or more and 5% or less, internal haze value is 0% or more and 5% or less In the case where, the surface haze value of optical film is 0% or more and 5% or less.

The surface haze value of optical film is preferably 0% or more and 1% hereinafter, more preferably 0% or more and 0.3% or less.

Surface haze value is only caused by the concaveconvex shape on the surface of optical film, by subtracting internal haze from total mist degree value Value, can find out the only surface haze value as caused by the concaveconvex shape on the surface of optical film.

In use average primary particle diameter be 1nm or more and 100nm inorganic oxide particle below is (for example, vapor phase method two Silica) as above-mentioned particle come in the case where forming optical layer, can obtain having lower total mist degree value (for example, 1% with Under total mist degree value) and lower internal haze value (for example, being essentially 0% internal haze value) optical film.That is, optics The total mist degree and internal haze of stacked film are to be deviateed transmitted through among the transmitted light of optical film due to forward scattering from incident light The ratio of 2.5 ° or more of transmitted light, therefore, if can reduce the ratio from 2.5 ° of incident light deviation or more of transmitted light, always Haze value and internal haze reduce.On the other hand, average primary particle diameter is 100nm inorganic oxide particle below in optical layer In do not agglomerate for bulk and form loose condensate, therefore, be not easy to diffuse in optical layer through the light of optical layer.Therefore, It, can in the case where using average primary particle diameter to be 1nm or more and 100nm inorganic oxide particle below forms optical layer Inhibit the generation for deviateing 2.5 ° or more of transmitted light from incident light, it is lower thereby, it is possible to obtain total mist degree value and internal haze value Optical film.

In the case where the bumps of the male and fomale(M&F) of above-mentioned optical layer are only caused by inorganic oxide particle, formed, it is easy shape At the bumps small with gentle and uniform concave-convex male and fomale(M&F), i.e. with curvature that can obtain antireflection and anti-watermark Male and fomale(M&F).Therefore, total mist degree value can be obtained and internal haze value is low and can further suppress the optical film of dazzle.

According to the present invention, the total mist degree value of optical film be 0% or more and 5% hereinafter, also, internal haze value be 0% with Above and therefore 5% hereinafter, be able to suppress brightness or the reduction of translucency.In addition, being able to suppress the image light of the inside of optical film Diffusion, therefore, will not there is a situation where a part of image light become stray light, as a result, there is no dark contrast reduce can Can, in addition, blurred image possibility is also not present.Thereby, it is possible to above-mentioned optical film is assembled into the small-sized shifting of superelevation fining Superelevation that the Horizontal number of pixels such as dynamic equipment, 4K2K (3840 × Vertical number of pixels of Horizontal number of pixels 2160) are 3000 or more is fine It is used in image display device.

According to the present invention, optical film has the optical layer with male and fomale(M&F), therefore, is able to suppress in Mght-transmitting base material and light The interference for the light that the light that the interface of layer is reflected is reflected with the male and fomale(M&F) in optical layer.Thereby, it is possible to inhibit to interfere The generation of striped.In addition, form be mixed in region in the case where, be able to suppress at the interface of Mght-transmitting base material and optical layer Reflection, therefore the generation of interference fringe can be further suppressed.

In the case where the bumps of the male and fomale(M&F) of above-mentioned optical layer are only caused by inorganic oxide particle, formed, also it is easy The concave-convex tilt angle for constituting male and fomale(M&F) is set not become larger.The excessive diffusion of extraneous light will not occur as a result, therefore, It is able to suppress the reduction of bright contrast.In addition it is possible to prevent image light from becoming stray light, it is thus possible to access good Dark contrast.Further, since there is the positive reflection ingredient of appropriateness, and therefore, when show motion video, the shining upon of image, brightness increasing By force, sense of quivering can be obtained.Thereby, it is possible to obtain having both the black color sense of excellent contrast and sense of quivering.

It should be noted that passing through the optical film for meeting above-mentioned formula (1) and (2), additionally it is possible to which providing improves dazzle and watermark Method.

In addition, being 200nm or more and surface by the half-peak breadth of the apparent height distribution on the surface for meeting above-mentioned optical film Concave-convex average curvature is 0.30mm^-1Optical film below, additionally it is possible to which the method for improving dazzle and watermark is provided.

Above-mentioned optical film can for example be assembled into the horizontal pictures such as 4K2K (3840 × Vertical number of pixels of Horizontal number of pixels 2160) It is used in the fine image display device of the superelevation that prime number is 3000 or more.As image display device, for example, Liquid crystal display (LCD), CRT display (CRT), plasma scope (PDP), electroluminescent display (ELD), Field Emission Display (FED), touch panel, tablet computer, Electronic Paper etc..

Above-mentioned image display device is preferably the liquid crystal display that Horizontal number of pixels is 3000 or more.Image display device by Back light unit and configuration are constituted in the liquid crystal display panel for having optical film than the back light unit person of closer looking at side.As backlight list Well known back light unit can be used in member.As above-mentioned backlight, quantum dot LED also can be used.

The effect of invention

Optical film of the invention is formed with specific concaveconvex shape, therefore, can sufficiently inhibit the generation of dazzle, can obtain To the display image of high-quality.

In addition, the display device of the invention with touch panel is formed on the surface with touch panel opposite direction of optical film There is specific concaveconvex shape, therefore, can sufficiently inhibit the generation of watermark and dazzle, the display image of high-quality can be obtained.

Therefore, optical film of the invention can be suitably applied CRT display (CRT), liquid crystal display (LCD), plasma scope (PDP), electroluminescent display (ELD), Field Emission Display (FED), Electronic Paper, plate electricity Brain etc..

Detailed description of the invention

Fig. 1 is the sectional view for schematically showing optical film of the invention.

Fig. 2 is to indicate to be measured using transmission image definition of the transmission image definition measurement device to optical film The schematic diagram of situation.

Fig. 3 is the sectional view for schematically showing the display device of the invention with touch panel.

Fig. 4 is to indicate that the light being incident in the second method of the display device of the invention with touch panel reflects The schematic diagram of situation.

Fig. 5 is the surface distribution curve of optical film of the invention.

Specific embodiment

The contents of the present invention are illustrated by following embodiments, but the contents of the present invention are not limited by these embodiments Qualitative interpretation.As long as no special declaration, then " part " and " % " is quality criteria.

(embodiment 1)

(production of optical film)

Prepare Mght-transmitting base material (tri cellulose acetate membrane, 40 μm of thickness, the manufacture of Konica Minolta company, KC4UAW), In the optical layer composition that the one side coating of the Mght-transmitting base material forms as follows, film is formed.

Then, for being formed by film, 50 DEG C of dry air is made to circulate 30 seconds with the flow velocity of 0.2m/s, then, into One step makes it dry the circulation of circulating of 70 DEG C of dry air 30 seconds with the flow velocity of 10m/s, thus steams the solvent in film Hair.

Then, using ultraviolet lamp (Fusion UV Systems Japanese firm manufactures, light source H light bulb), in nitrogen It with accumulated light is 100mJ/cm under gas atmosphere (oxygen concentration 200ppm or less)²Mode irradiate ultraviolet light, make curing of coating, by This forms the optical layer of thickness 5.0 μm (when solidification), is fabricated to optical film.

(optical layer composition)

(embodiment 2)

In addition to making the condition of cure of film so that the accumulated light of ultraviolet light is 50mJ/cm²Mode be irradiated come Make other than curing of coating, is identically formed buckle layer with the optical layer of embodiment 1.

It is coated with composition for low refractive index layer as follows on the surface for being formed by buckle layer, forms film.

Then, for being formed by film, 40 DEG C of dry air is made to circulate 15 seconds with the flow velocity of 0.2m/s, then, into One step makes 40 DEG C of dry air circulate 30 seconds to make it dry, thus evaporate the solvent in film with the flow velocity of 10m/s.

Then, using ultraviolet lamp (Fusion UV Systems Japanese firm manufactures, light source H light bulb), in nitrogen It with accumulated light is 100mJ/cm under gas atmosphere (oxygen concentration 200ppm or less)²Mode irradiate ultraviolet light, make curing of coating, by This forms the low-index layer of 0.1 μ m thick (when solidification), forms the low refraction for having buckle layer and being layered on the buckle layer The optical layer of the composition of rate layer.It is fabricated to the optical film of embodiment 2 as a result,.

(composition for low refractive index layer)

(embodiment 3)

In addition to making 0.8 mass parts of combined amount of the silicon dioxide microparticle in optical layer composition, making the drying of film Condition is after so that 70 DEG C of dry air is circulated with the flow velocity of 1.0m/s 15 seconds, further with the flow velocity of 10m/s makes 70 DEG C dry Dry air circulation made optical film other than 30 seconds similarly to Example 1.

(embodiment 4)

Other than when making the solidification of optical layer with a thickness of 4.5 μm, optical film is made similarly to Example 1.

(embodiment 5)

In addition to make the drying condition of film with the flow velocity of 1.0m/s make 70 DEG C dry air circulate 15 seconds after, further When so that 70 DEG C of dry air is circulated 30 seconds with the flow velocity of 10m/s, and making the solidification of optical layer with a thickness of other than 4.5 μm, Optical film is made similarly to Example 3.

(embodiment 6)

In addition to the organic granular (acrylic-styrene copolymer in optical layer composition containing 1.0 mass parts Grain, average grain diameter: 2.0 μm, refractive index: 1.55, ponding is melted into the manufacture of product industrial group), and make the drying condition of film After so that 70 DEG C of dry air is circulated 15 seconds with the flow velocity of 1.0m/s, further make with the flow velocity of 10m/s 70 DEG C of dry air Other than circulation 30 seconds, optical film is made similarly to Example 1.

(comparative example 1)

Make 1.0 mass parts of combined amount of the silicon dioxide microparticle in optical layer composition, while making optical layer group Close object in containing 3.0 mass parts organic granular (acrylic-styrene copolymer particle, average grain diameter: 2.0 μm, refractive index: 1.55, ponding is melted into the manufacture of product industrial group), so that the drying condition of film is made 70 DEG C of dry air with the flow velocity of 0.2m/s So that 70 DEG C of dry air is circulated 30 seconds after circulation 15 seconds, further with the flow velocity of 10m/s, makes the thickness when solidification of optical layer It is 4.0 μm, in addition to this, makes optical film similarly to Example 1.

(comparative example 2)

Other than cooperating silicon dioxide microparticle not in optical layer composition, optics is made similarly to Example 1 Film.

<evaluation of anti-shining upon property>

By the optical film made in each embodiment and comparative example by clear binder in the way of making male and fomale(M&F) surface It pastes on black acrylic resin plate.Under bright light environments from distance about 2m at by visual observation from the sample, according to following Benchmark evaluation whether obtained observer and observer background anti-the shining upon property for shining upon unnoticed degree.

Zero: shining upon not noticeable

×: it is clearly observed and shines upon

<the presence or absence of watermark>

By the optical film made in each embodiment and comparative example by clear binder in the way of making male and fomale(M&F) surface It pastes on black acrylic resin plate.

In addition, with a thickness of 0.7mm and the both ends Continuous pressing device for stereo-pattern of the glass plate having a size of 10cm × 10cm.Then, so that The mode that optical film and glass plate separate, the face for being pasted with adhesive tape of glass plate and optical film are matched in mode facing with each other It sets.0.1mm is divided between gap between the surface and glass plate of optical film.Then, in the state of laminated glass that press...withes one's finger Under, from sodium vapor lamp irradiation light of the configuration on glass, investigate whether confirm watermark.Evaluation criteria is as follows.Show the result in table 1 In.

◎: watermark is not confirmed.

Zero: observing watermark slightly, but be in unquestioned level.

×: clearly confirm watermark.

<measurement of transmission image definition>

For each optical film obtained in embodiment and comparative example, transmission image definition is measured as follows.It shows the result in In table 1.

Firstly, preparing image definition analyzer (model: ICM-1T, SUGA TEST INSTRUMENTS company manufacture).

Then, by each optical film of embodiment and comparative example so that triacetyl cellulose resin film side is located at image definition The mode of the light source side of analyzer is arranged, and measures according to based on the measuring method of the image definition of the transmission beam method of JIS K7374 Transmission image definition.As light comb, the light comb of 0.125mm wide, 0.25mm wide are used.Then, it finds out using 0.25mm's wide Transmission image definition (the C of the transmission image definition (C (0.25)) of light comb measurement and the light comb measurement using 0.125mm wide (0.125)) difference (C (0.25)-C (0.125)).In addition, using 0.5mm wide, 1.0mm wide, 2.0mm wide for for reference Light comb determines the transmission image definition of each optical film of embodiment and comparative example as described above.

<appraisal of glare (1)>

For each optical film obtained in embodiment and comparative example, by the face that optical layer is not formed of optical film with The glass surface that matrix is not formed of the black matrix" (thickness of glass 0.7mm) of 350ppi is bonded with adhesive.It is obtained for such White area source (the LIGHTBOX, average brightness 1000cd/m of HAKUBA manufacture is arranged in black matrix" side in the sample arrived²), Thus dazzle is generated with making its simulation.Use CCD camera (KP-M1, C connector, extension ring: PK-11A Nikon, camera mirror Head: 50mm, F1.4s NIKKOR) it is shot from optical film side.CCD camera is set as at a distance from optical film 250mm, the focusing for adjusting CCD camera focus on it on optical film.The image for using CCD camera to shoot is imported personal In computer, image processing software (ImagePro Plusver.6.2 is used；The manufacture of Media Cybernetics company) it is as follows It is analyzed.Firstly, selecting the evaluation position of 200 × 160 pixels from the image of importing, 16 words are converted in the evaluation position The grayscale of section.

Then, low pass filter is selected from the enhancing option of optical filter order, in 3 × 3, number 3, the condition of intensity 10 It is lower to use optical filter.It will be removed as a result, from the ingredient of black matrix pattern.

Then, selection planarization, in background: carrying out shadow correction under conditions of dark, object width 10.

Then, using contrast enhancing order with contrast: 96, brightness: 48 degree of comparing enhance.By obtained figure Picture is converted to 8 byte grayscale, and to 150 × 110 pixel therein, the deviation of the value of each pixel is calculated with standard deviation value, by This quantizes dazzle.The dazzle value of the numeralization is smaller, it may be said that dazzle is fewer.It shows the result in table 1.

<appraisal of glare (2)>

For each optical film obtained in embodiment and comparative example, dazzle is evaluated as follows.By brightness 1500cd/m²Lamp The state that case (white area source), the black matrix" glass of 350ppi, optical film are sequentially successively overlapped from lower section according to this, 15 From upper and lower, left and right, various angles carry out visual valuation to position subject at distance about 30cm.Judge whether dazzle is noticeable, presses It is evaluated according to following benchmark.It shows the result in table 1.

◎: it answers to be more than good artificial 13 people

Zero: answering as good artificial 10~12 people

△: it answers as good artificial 7~9 people

×: it answers as below good artificial 6 people

<total mist degree, internal haze, Surface haze measurement>

For each optical film obtained in above-described embodiment and comparative example, total mist degree, internal haze, surface mist are measured as follows Degree.It shows the result in table 2.

Firstly, measuring optical film according to JIS K7136 using haze meter (HM-150, color technical research institute manufacture in village) Total mist degree value.

Then, triacetyl cellulose substrate (Konica U.S. energy is pasted by transparent optical adhesive layer on the surface of optical layer It is manufactured up to company, KC4UAW).The concaveconvex shape of the male and fomale(M&F) of optical layer is set to collapse as a result, the surface of optical film becomes flat. In this state, haze value is measured according to JIS K7136 using haze meter (HM-150, color technical research institute manufacture in village), Find out internal haze value.Then, internal haze value is subtracted from total mist degree value, thus finds out surface haze value.

< three-dimensional average slope angle θ a_3DMeasurement >

The surface of each optical film obtained in embodiment and comparative example, it is following to measure three-dimensional average slope angle θ a_3D.It will knot Fruit is shown in Table 2.

The surface of the side opposite with indent and convex surface is formed of each optical film is pasted into glass by clear binder Sample is made in glass plate, is carried out under the following conditions using white interference microscope (manufacture of New View7300, Zygo company) Measurement, the analysis of the surface shape of optical film.It should be noted that measurement, analysis software use MetroPro ver8.3.2's Microscope Application。

(determination condition)

Object lens: 50 times

Amplification: 1 times

Measure region: 545 545 μm of μ ms

Resolution ratio (every 1 point of interval): 0.44 μm

(analysis condition)

It has removed: flat

Optical filter: high pass

Filter types: Gauss batten

Low wavelength: 250 μm

High wavelength: 3 μm

It removes spike: opening

Spike height (xRMS): 2.5

It should be noted that low wavelength is equivalent to the cutoff value λ c in roughness parameter.

Then, existed using above-mentioned analysis software (MetroPro ver8.3.2-Microscope Application) " Ra " is shown on Slope Mag Map picture, using its numerical value as the θ a of optical film_3D。

<measurement of Smp, Ra, Rz>

Utilize the above-mentioned three-dimensional average slope angle θ a of calculating_3DWhen obtained surface profile data and identical analysis condition exist " Ra ", " SRz " are shown on Surface Map picture, using respective numerical value as Ra, Rz of optical film.

Then, " Save Data " button is shown in above-mentioned Surface Map picture, the three-dimensional after saving analysis is bent Surface roughness data.Then, above-mentioned preservation data are read using Advanced Texture Application and application is following Analysis condition.

(analysis condition)

High FFT optical filter: it closes

Low FFT optical filter: it closes

Removal: flat

Then, it shows Peak/Valleys picture, the number at peak is counted by " Peaks Stats ".Wherein, in order to remove Inapparent peak, by 1/10000 or more of the area (125 μ m, 125 μ m π) that area is circle using low wavelength as diameter and Height is 1/10 or more the peak of Rtm as count target.It should be noted that Rtm can be from " Roughness/Waviness Map " reads in picture, indicates the average value of the maximum height in each region when all measurement region segmentation is 3 × 3.Then, Benefit with the aforedescribed process, i.e., calculates Smp based on following formula.It shows the result in table 2.

[number 7]

[table 1]

[table 2]

	Total mist degree	Internal haze	Surface haze	θa3D[°]	Smp[mm]	Ra[μm]	Rz[μm]
								Embodiment 1	0.3	0.2	0.1	0.26	0.182	0.059	0.19
Embodiment 2	0.3	0.2	0.1	0.28	0.122	0.046	0.16
								Embodiment 3	0.3	0.2	0.1	0.30	0.150	0.057	0.19
Embodiment 4	0.3	0.2	0.1	0.18	0.122	0.039	0.12
								Embodiment 5	0.3	0.2	0.1	0.28	0.128	0.052	0.18
Embodiment 6	1.5	1.3	0.2	0.30	0.111	0.049	0.19
								Comparative example 1	3.2	2.5	0.7	0.52	0.098	0.064	0.27
Comparative example 2	0.2	0.2	0.0	0.10	0.032	0.001	0.02

As shown in Table 1 and Table 2, anti-the shining upon property of the optical film of embodiment, watermark, dazzle (1), each evaluation of (2) are excellent, In addition, each value of total mist degree, internal haze, Surface haze is also sufficiently low.

On the other hand, the difference of the value of the value and C (0.125) of the C (0.25) of the optical film of comparative example 1 is small, optics layer surface Concaveconvex shape it is gentle, the evaluation of dazzle is poor.In addition, the value of the C (0.125) of the optical film of comparative example 2 is big, also, C (0.25) Value and C (0.125) value difference it is small, prevent that the evaluation of shining upon property and watermark is poor.

<half-peak breadth of apparent height distribution>

By the table of the side opposite with the surface for being formed with optical layer of each optical film obtained in embodiment and comparative example Face pastes by clear binder and sample is made on glass plate, and using white interference microscope, (New View7300, Zygo are public Department's manufacture) the surface distribution curve of optical film is obtained under the following conditions.

It should be noted that measurement, analysis software use the Microscope of MetroPro ver8.3.2 Application。

(determination condition)

Object lens: 10 times

Amplification: 1 times

Measure region: 2.71mm × 2.71mm

Resolution ratio (every 1 point of interval): 2.18 μm

(analysis condition)

It has removed: nothing

Optical filter: band logical

Filter types: Gauss batten

Low wavelength: 800 μm

High wavelength: 25 μm

It removes spike: opening

Spike height (xRMS): 2.5

It should be noted that low wavelength is the wavelength of long wavelength cutoff optical filter, Gao Bochang is equivalent to short wavelength and ends filter The wavelength of mating plate.

Then, it is shown using above-mentioned analysis software (MetroPro ver8.3.2-Microscope Application) Surface Map picture shows histogram in a manner of making interval width about 20nm in above-mentioned picture, obtains apparent height The histogram data of distribution.

The distribution of position that the height of the distribution of its peak position is read by obtained histogram data, half height Width, the half-peak breadth as apparent height distribution.

It should be noted that passing through the straight line of the value of each group of obtained histogram data in the calculating of half-peak breadth Interpolation makes curve of approximation, calculates half-peak breadth by the curve.

<average curvature of concave-convex surface>

From the surface distribution curve obtained as described above, in the x-direction for point this 3 points before and after each point and its, Curvature is calculated according to above formula, and calculates the average value of the curvature of all the points, thus calculates the average curvature of concave-convex surface.

About manufactured optical film in each embodiment and comparative example, by the half-peak breadth of apparent height distribution, concave-convex surface The presence or absence of average curvature, watermark, appraisal of glare (1), (2), total mist degree, internal haze, Surface haze, three-dimensional average slope angle θ A3D, " Smp ", " Ra " and " Rz " result be shown in Table 3.

[table 3]

As shown in table 3, the watermark, dazzle (1), each evaluation of (2) of the optical film of Examples 1 to 6 are excellent, in addition, total mist Degree, internal haze, each value of Surface haze are also sufficiently low.

On the other hand, the average curvature of the surface unevenness profile of the optical film of comparative example 1 is big, is caused by surface unevenness profile Lens effect increase, the evaluation of dazzle is poor.

In addition, the half-peak breadth that the apparent height of the optical film of comparative example 2 is distributed is small, the evaluation of watermark is poor.

[industrial applicibility]

Due to optical film of the invention have above-mentioned composition, can inhibit shine upon, Newton's ring while sufficiently press down The generation of dazzle processed can obtain the display image of high-quality.In addition, due to the display device tool of the invention with touch panel There is above-mentioned composition, therefore can sufficiently inhibit the generation of watermark and dazzle, the display image of high-quality can be obtained.

Therefore, the display device of the invention with touch panel can be suitably applied CRT display (CRT), liquid crystal display (LCD), plasma scope (PDP), electroluminescent display (ELD), Field Emission Display (FED), Electronic Paper, tablet computer etc..

[explanation of symbol]

11 optical films

12 Mght-transmitting base materials

13 optical layers

14 concaveconvex shapes

100 transmission image definition measurement devices

101 light sources

102 slits

103,104 lens

105 light combs

106 optical receivers

30 display devices with touch panel

31 optical films

32 Mght-transmitting base materials

33 optical layers

34 concaveconvex shapes

35 touch panels

43 optical layers

44 concaveconvex shapes

45 touch panels

46 gaps

Claims (7)

1. a kind of optical film, with the composition for being laminated with optical layer of the surface with concaveconvex shape on Mght-transmitting base material, It is characterized in that,

The half-peak breadth of the apparent height distribution on the surface of the optical film is 200nm or more,

The average curvature of concave-convex surface is 0.30mm^-1Below.

2. optical film as described in claim 1, wherein the total mist degree value of optical film is 0% or more and 5% hereinafter, the light The internal haze value for learning film is 0% or more and 5% or less.

3. optical film as claimed in claim 1 or 2, wherein optical layer contains binder resin and particle.

4. optical film as claimed in claim 3, wherein particle is inorganic oxide particle.

5. optical film as claimed in claim 4, wherein the average primary particle diameter of inorganic oxide particle be 1nm or more and 100nm or less.

6. optical film as described in claim 4 or 5, wherein inorganic oxide particle is that surface has been carried out silicic acid anhydride Inorganic oxide particle.

7. a kind of display device with touch panel has optical film and touch-control described in claim 1,2,3,4,5 or 6 The oppositely disposed composition of panel, which is characterized in that

The optical film is with the touch panel with the optical layer in the optical film in the state of having gap between each other Mode facing with each other is oppositely disposed with the touch panel.