CN106199791B - A kind of interval apex angle wobble structure brightness enhancement film - Google Patents
A kind of interval apex angle wobble structure brightness enhancement film Download PDFInfo
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- CN106199791B CN106199791B CN201610545591.XA CN201610545591A CN106199791B CN 106199791 B CN106199791 B CN 106199791B CN 201610545591 A CN201610545591 A CN 201610545591A CN 106199791 B CN106199791 B CN 106199791B
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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Abstract
The present invention relates to a kind of optical thin film more particularly to a kind of interval apex angle wobble structure brightness enhancement films.In order to which the anti-adsorption effect for solving the continuous wobble structure of existing brightness enhancement film is bad, and the problem that the brightness that will cause brightness enhancement film is relatively low, the present invention provide a kind of interval apex angle wobble structure brightness enhancement film.The brightness enhancement film includes substrate layer and the structure sheaf for being attached to substrate layer upper surface；The structure sheaf includes several prism structures；The prism structure is the triangular prism that cross section is isosceles triangle；The bottom edge L of isosceles triangle corresponding to the same triangular prism is equal and is located at substrate layer upper surface；Height variation of the vertex of the isosceles triangle in longitudinal profile.The height variation on the vertex is periodic；One period includes shake cycle T and shake interval D.The form and dimension of several triangular prisms is identical and is parallel to each other.The anti-adsorption effect of the brightness enhancement film is fine, and brightness is also high.
Description
Technical field
The present invention relates to a kind of optical thin film more particularly to a kind of interval apex angle wobble structure brightness enhancement films.
Background technique
Liquid crystal display LCD (Liquid Crystal Display) is the current most common display technology.LCD is non-hair
The display equipment of photosensitiveness, needing to provide highlighted, uniform light source by backlight module BLU (BackLight Unit) can be only achieved
Display effect.It include three kinds of light source, light guide plate and reflectance coating, diffusion barrier and brightness enhancement film main optical films in backlight module
Piece.
The effect of brightness enhancement film (BEF, Brightness Enhancement Film) is will be even by realizing after diffusion sheet
The most of light change, scattered is converged to again within centre visual angle (relative to light-emitting surface normal ± 35 °), is significantly improved just
Brightness reduces the loss of the low angle of emergence (relative to light-emitting surface) scattering light.
Brightness enhancement film generally uses strip microprism (Prism) structure of isoceles triangle type, by light in prism side
Refraction, the multiple refraction between total reflection and prism, generate facing accumulative effect and recycling effect for light, realize
The angle of emergence of most light is controlled.
Traditional brightness enhancement film is the equidistant prism array of ordered arrangement, and prism vertex angle immobilizes, and generally brightness is most
90 ° of optimization.For this brightness enhancement film in LCD applications, orderly prism array can be with the pixel of liquid crystal display ordered arrangement
(Pixel) it is superimposed, generates interference, i.e. Moire fringe, or claim water ripples.
Currently, the interference problem of brightness enhancement film is that liquid crystal display industry is most difficult to the problem captured all the time, especially when
Liquid crystal display develop increasingly high definition, this problem will more be difficult to solve.
In addition, the absorption problem between diaphragm is more and more obvious under the thinning tendency of liquid crystal display industry.And it adsorbs
It is uneven that problem will lead to diaphragm, directly generation visual problem (Newton's ring), or the serious reliability problems such as fold occur.
Therefore, in slim machine, while solving interference, it is also desirable to absorption problem is solved, and general absorption problem just needs to make
The wave crest for obtaining prism has enough differences of height.
For interference problem, solution is usually to use wobble structure (Wave structure), so that prism is high
Low fluctuating, or move left and right, out-of-order effect is generated with this, it is intended to upset the exit direction of light, mitigate between pixel
Interference problem.Left and right wobble structure is easy to produce absorption problem because its prism wave crest way of contact is still contour linear contact.
Therefore, solving the most common mode of interference problem at present is that (following mentioned wobble structures herein, refer both to up and down for shake up and down
Shake).
It should be pointed out that above-mentioned wobble structure is continuously shake, possess the fixed perhaps period of variation and fixed or change
The amplitude of change.Vertex is usually the half cycle of continuous sine curve convex state along the trajectory line that prism longitudinal profile is presented
Phase.
In fact, continuous wobble structure is imperfect.
Firstly, wobble structure has certain luminance loss compared to contour parallel structure, the extent of damage depends on trembling
The dynamic period and amplitude: in general, shake the period it is smaller, that is, shake it is more frequent, luminance loss it is bigger；Jitter amplitude is bigger,
It shakes more violent (difference of height of adjacent prisms is more), luminance loss is also bigger.Its essential reason has two o'clock: first, height
The luminance of prism is originally lower than contour prism luminance, and wobble structure causes the adjacent prism region of many height, generates luminance
Loss, therefore shake is more violent, more frequent, luminance loss is more；Second, wobble structure cutter be opened when, cutting not as good as etc.
The smoothness that height comes, and cut more smooth, cutting face more levels off to mirror surface, and the prism structure after overmolded also more levels off to mirror surface, makes
Used time generation scattering is fewer, and luminance is higher.
Secondly, common wobble structure is still rule, period amplitude is simultaneously nonrandom, thus its anti-adsorption effect is also simultaneously
It is non-fabulous.Its essential reason is the high point of shake still all a horizontal position.
Therefore, in view of the above-mentioned problems, it is necessary to propose further solution.
Summary of the invention
In order to which the anti-adsorption effect for solving the continuous wobble structure of existing brightness enhancement film is bad, and it will cause the brightness of brightness enhancement film
Relatively low problem, the present invention provide a kind of interval apex angle wobble structure brightness enhancement film.The anti-adsorption effect of the brightness enhancement film is fine, brightness
It is high.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical solutions:
The present invention provides a kind of interval apex angle wobble structure brightness enhancement film, and the brightness enhancement film includes substrate layer and is attached to substrate
The structure sheaf of layer upper surface；The structure sheaf includes several prism structures；The prism structure is that cross section is isoceles triangle
The triangular prism of shape；The bottom edge L of isosceles triangle corresponding to the same triangular prism is equal and is located at substrate layer upper surface；Institute
State height variation of the vertex of isosceles triangle in longitudinal profile.
The prism structure refers to the triangular prism (also known as prism) of the strip (longitudinal direction) of single.
The cross section of the triangular prism is isosceles triangle.
Optional 0.03~the 0.25mm of the thickness of the substrate layer, substrate layer thickness selection gist different application field, is such as answered
Substrate layer thinner thickness is needed used in mobile phone, plate etc., applies and needs substrate layer thickness thicker in display, TV etc..
The optional polyethylene terephthalate of the material of substrate layer (PET), polybutylene terephthalate (PBT) (PBT),
Polycarbonate (PC), copolymer of methyl methacrylatestyrene (MS), glass, polymethyl methacrylate (PMMA) or poly-
One of styrene (PS), generally PET, PBT, PC it is this kind of can biaxial tension membrane material, less situation selects PMMA, glass
Equal plates (because membrane material is easier to process compared with plate), in PET, PBT, PC between these three, be generally more likely to selection cost is relatively low,
Be easy to do the PET of surface treatment.
The material of the prism of the structure sheaf is light-cured resin；The light-cured resin generally by unsaturated polyester (UP),
Epoxy acrylate, urethane acrylate, polyester acrylate, polyether acrylate, acroleic acid esterification polyacrylic resin,
One or more of epoxy resin oligomer component causes free radical by photoinitiator or cationic polymerization forms.According to
Actual needs selection epoxy acrylate (does not have elastic, at low cost), and urethane acrylate (has elasticity, anti-deformation energy
Power is more excellent).
Further, the height variation on the vertex is periodic；One period include shake cycle T and
Shake interval D.
The periodic change in location is also referred to as interval and shakes.The shake cycle T of the interval shake is shorter, between shake
Every D longer；What T was indicated be change in location in a cycle initial point to the distance between the terminal of change in location, what D was indicated is one
For the terminal of change in location to the distance between the initial point of next cycle change in location, the unit of T and D are μm in a period.
Further, the form and dimension of several triangular prisms is identical and is parallel to each other；The spacing of the triangular prism
For the distance between the vertex of two isosceles triangles of adjacent two triangular prisms in same cross section, indicated with W, W 10-
100μm。
Several described prism structures are arranged in parallel, form array, and prism structure is laid in the upper surface of substrate layer.It is described
Light leakage plane is not present in substrate layer.
The horizontal distance on the vertex of the isosceles triangle is also known as prism spacing Pitch.
In the interval apex angle wobble structure brightness enhancement film, the prism spacing W be 10-100 μm, see embodiment 1-6,
17-18.Preferably, W is 20-50 μm, sees embodiment 1,4-6,17-18；Preferably, W is 24-50 μm, sees embodiment 1,5-6,
17-18.In shake period and shake interval, bottom edge L and W is isometric.
Further, the trajectory line that isosceles triangle vertex is presented along triangular prism longitudinal profile in the shake period
For one of the half period of sine curve convex state, arc, trapezoidal, triangle.
There are consecutive variations on the vertex of isosceles triangle in the shake period in height above sea level；In the shake interval
Vertex is straight line along the trajectory line that prism longitudinal profile is presented.
The shaking way is that the height on vertex changes；Interval shake is done along longitudinal extend of triangular prism in the vertex, this
The height variation on vertex is caused by the apex angle size variation of the isosceles triangle, and the bottom edge L of isosceles triangle is remained unchanged,
Therefore cause the height above sea level on vertex that consecutive variations occur indirectly.
The trajectory line confrontation adsorption effect and brightness that the triangular apex is presented along longitudinal profile all have an impact.This
Half period of the preferred arc of trajectory line, sine curve convex state in invention and trapezoidal.Further, preferred sine curve convex
The half period of state.
Further, the shake cycle T is 50-500 μm.
In the interval apex angle wobble structure brightness enhancement film, the shake cycle T is 50-500 μm, see embodiment 1,5,
11-14,17-18.Preferably, shake cycle T is 200-300 μm, sees embodiment 1,5,13-14,17-18.
Further, the shake interval D is 1-50 times for shaking cycle T.
In the interval apex angle wobble structure brightness enhancement film, the shake interval D is 1-50 times for shaking cycle T, sees reality
Apply example 1,5,15-18.Preferably, D is 5-50 times, sees embodiment 1,5,16-18.It is further preferred that D is 25-50 times, reality is seen
Apply example 1,5,17-18.It is further preferred that D is 40-50 times, embodiment 17-18 is seen.
Further, the lifting degree on the basis of the highest point in the shake period, relatively shake are spaced is in the shake period
Difference of height, indicated with A, A be 0.5-5 μm.
In the interval apex angle wobble structure brightness enhancement film, the difference of height A in the shake period is 0.5-5 μm, sees reality
Apply example 1,5,17-22.Preferably, A is 2-3 μm, sees embodiment 1,5,17-18,21-22.
When the difference of height is caused by the size variation of vertex angle this mode, the apex angle variation of triangle and top
Point height variation is that strain stress relation is as follows: A=L (cot (θ '/2)-cot (θ/2))/2.
Further, the apex angle that the shake is spaced interior isosceles triangle indicates that it is 60-120 ° that θ, which is fixed, with θ.
In the interval apex angle wobble structure brightness enhancement film, the vertex angle theta of shake interval interior triangular is fixed as 60-
120 °, see embodiment 1,5,7-10,17-18.Preferably, θ is 85-95 °, sees embodiment 1,5,9-10,17-18.
The apex angle of isosceles triangle is variation in the shake period, is by the top of fixed bottom edge length L and variation
Point height and determination.
Further, the brightness enhancement film also includes diffusion layer, and the diffusion layer is attached to the lower surface of substrate layer.
The material of the diffusion layer be simple light-cured resin (the overmolded stamping structure without particle, such as
) or the mixture of the mixture or particle of particle and light-cured resin and heat reactive resin Microlens.
The material of the particle is silicon compound (for example, silica), silicone resin, polystyrene (PS), poly- first
One of base methyl acrylate (PMMA), polybutyl methacrylate (PBMA), nylon (PA), polyurethane (PU) or in which extremely
Few two kinds of mixture, the shape of particle are spherical or elliposoidal, and average grain diameter is 3~30 μm, the weight of particle account for particle with
The 3~65% of total resin weight.In general, the material of particle can according to the characteristic needs of different product (it is e.g., inexpensive, from
Body scratch resistance, anti-scratch other materials), selection PMMA (poor flexibility, intensity are high, at low cost), (elastic strength cost is suitable by PBMA
In), PA (elasticity is good, intensity is high, at high cost), the different particles such as PA (elasticity is good, intensity is low, at high cost).Shape of particle is general
For spherical (be easy production, at low cost).Average grain diameter and particle accounting can generally be selected according to the mist degree and roughness of coating.
Therefore, the material and performance of particle are not made preferably, to select according to the actual situation herein.
The light-cured resin is generally by unsaturated polyester (UP), epoxy acrylate, urethane acrylate, polyester acrylic
One or more of ester, polyether acrylate, acroleic acid esterification polyacrylic resin, epoxy resin oligomer component passes through light
Initiator causes free radical or cationic polymerization forms.According to actual needs select epoxy acrylate (do not have elasticity, at
This is low), urethane acrylate (has elasticity, ability of anti-deformation is more excellent).
The heat reactive resin is generally solidified friendship at high temperature by polyester polyol (host agent) and isocyanates (curing agent)
Connection (typical polyurethane reaction) forms.And the polyester polyol is generally polyethylene glycol adipate glycol, polyadipate second
Glycol-propylene glycol esterdiol, polyadipate diglycol esterdiol, polyadipate ethylene glycol-diglycol ester two
Alcohol, polyadipate -1,4- butyl glycol ester diol, polyadipate ethylene glycol -1,4- butyl glycol ester diol, polyadipate new penta 2
One of alcohol -1,6-HD esterdiol or in which at least two mixture；The curing agent is the own diisocyanate of 1,6-
Ester, isophorone diisocyanate, benzene dimethylene diisocyanate, Methylcyclohexyl diisocyanate, dicyclohexyl methyl hydride
One of diisocyanate or in which at least two mixture.
Further, the present invention also provides a kind of preparation method of interval apex angle wobble structure brightness enhancement film, the method packets
Containing following step:
(1) in substrate layer or the upper surface coated UV curable resin of the substrate layer with precoating diffusion layer；
(2) it is rolled with mold, forms prism layer after photocuring, interval apex angle wobble structure brightness enhancement film is made.
The mold rolled, it is different according to the shake track on standby vertex of drawing up, and using has specific complementation
The mold of structure.
Compared with prior art, interval apex angle wobble structure brightness enhancement film provided by the present invention, has an advantage that anti-suction
Attached effect is fine, and brightness is also high.
Detailed description of the invention
Fig. 1 is the trajectory line of the vertex section along longitudinal direction of different type prism structure
Fig. 2 is the brightness enhancement film of traditional contour structure；
Fig. 3 is the brightness enhancement film of traditional continuous wobble structure up and down；
Fig. 4 is interval apex angle wobble structure brightness enhancement film；
Fig. 5 is interval apex angle wobble structure brightness enhancement film (containing diffusion layer)；
Description of symbols:
0: substrate layer；1: structure sheaf；10: traditional contour prism structure；
11: traditional to shake prism structure up and down；12: interval apex angle wobble structure；
2: diffusion layer；3: structure sheaf longitudinal profile；
30: the trajectory line of the vertex of traditional contour prism structure section along longitudinal direction；
31: the trajectory line of the vertex section along longitudinal direction of the traditional prism structure of shake up and down；
32: novel intermittent shakes the trajectory line (half cycle of sine curve convex state of the vertex section along longitudinal direction of prism structure
Phase)；
33: novel intermittent shakes the trajectory line (arc) of the vertex section along longitudinal direction of prism structure；
34: novel intermittent shakes the trajectory line (trapezoidal) of the vertex section along longitudinal direction of prism structure；
35: novel intermittent shakes the trajectory line (triangle) of the vertex section along longitudinal direction of prism structure；
4: the reference line of vertex trajectories line；5: jitter curve and the smooth chamfering of straight line connect；
Specific embodiment
It, hereafter will be of the invention preferable for the functional character and advantage that is more readily understood structure of the invention and can reach
Embodiment, and schema is cooperated to be described below in detail:
As shown in Figure 1,30 for the vertex section along longitudinal direction of traditional contour prism structure trajectory line, 31 is on traditional
The trajectory line of the vertex section along longitudinal direction of lower shake prism structure, 32 vertex for shaking prism structure for novel intermittent are cutd open along longitudinal direction
The trajectory line in face.It should be appreciated that 32 be not 30 and 31 combination, in 32 shake period, the elevational position on vertex is always than trembling
Dynamic interval (reference line 4) wants high, unlike 31 continuous jitter curve, does the variation alternatively up and down of elevational position (compared to base
Directrix 4).And in actual design, between 32 shake period and shake interval, i.e., it must be provided between jitter curve and straight line
The chamfering of smooth transition, this also complies with the actual conditions in processing.
Compare from brightness: since 30 be contour structure, be it is most bright, as benchmark；31 be continuous shake, generally can be compared with
The low 3-5% of benchmark, according to jitter amplitude and frequency；And 32 because wobble structure proportion is greatly lowered, therefore compared with benchmark
Only low 0.5-1.5% or so.
Compare from anti-adsorption capacity: when with above stacks of thin films is set, 30,31 and 32 contour point respectively constitutes line and connects
Touching, intensive point contact and loose point contact.It should be evident that 30 be not anti-absorption, although 31 anti-absorption, anti-suction
Attached effect wants poor compared with 32.
Therefore: brightness 30 > 32 > 31；Anti- absorption 32 > 31 > 30；32 comprehensive performance is always better than 31.
In interval apex angle wobble structure brightness enhancement film of the present invention, in which: the optional 0.03~0.25mm of the thickness of substrate layer,
In general, substrate layer thickness selection gist different application field, such as apply and need substrate layer thinner thickness in mobile phone, plate,
It applies and needs substrate layer thickness thicker in display, TV etc.；The optional polyethylene terephthalate of material (PET), poly- pair
Benzene dicarboxylic acid butanediol ester (PBT), polycarbonate (PC), copolymer of methyl methacrylatestyrene (MS), glass, poly- first
One of base methyl acrylate (PMMA) or polystyrene (PS), generally PET, PBT, PC it is this kind of can biaxial tension film
Material, the plates (because membrane material is easier to process compared with plate) such as less situation selection PMMA, glass, in PET, PBT, PC between these three,
Generally being more likely to selection, cost is relatively low, the PET for the surface treatment that is easy to do.
The prism material of structure sheaf is light-cured resin；
The material of diffusion layer is simple light-cured resin (the overmolded stamping structure without particle, such as Microlens), or
It is the mixture of particle and light-cured resin or the mixture of particle and heat reactive resin.
The material of particle is silicon compound (for example, silica), silicone resin, polystyrene (PS), poly- methyl-prop
One of e pioic acid methyl ester (PMMA), polybutyl methacrylate (PBMA), nylon (PA), polyurethane (PU) or in which at least two
Kind mixture, the shape of particle is spherical or elliposoidal, and average grain diameter is 3~30 μm, and particle accounting is 3~65% (opposite
In particle and resin total amount).In general, the material of particle can according to the characteristic needs of different product (it is e.g., inexpensive, itself
Scratch resistance, anti-scratch other materials), select PMMA (poor flexibility, intensity are high, at low cost), PBMA (elastic strength moderate cost),
The different particles such as PA (elasticity is good, intensity is high, at high cost), PA (elasticity is good, intensity is low, at high cost).Shape of particle is generally ball
Shape (easy to produce, is at low cost).Average grain diameter and particle accounting can generally be selected according to the mist degree and roughness of coating.Cause
This, the material and performance of particle are not made preferably, to select according to the actual situation herein.
The light-cured resin is generally by unsaturated polyester (UP), epoxy acrylate, urethane acrylate, polyester acrylic
One or more of ester, polyether acrylate, acroleic acid esterification polyacrylic resin, epoxy resin oligomer component passes through light
Initiator causes free radical or cationic polymerization forms.According to actual needs select epoxy acrylate (do not have elasticity, at
This is low), urethane acrylate (has elasticity, ability of anti-deformation is more excellent).
The heat reactive resin is generally solidified friendship at high temperature by polyester polyol (host agent) and isocyanates (curing agent)
Connection (typical polyurethane reaction) forms.And the polyester polyol is generally polyethylene glycol adipate glycol, polyadipate second
Glycol-propylene glycol esterdiol, polyadipate diglycol esterdiol, polyadipate ethylene glycol-diglycol ester two
Alcohol, polyadipate -1,4- butyl glycol ester diol, polyadipate ethylene glycol -1,4- butyl glycol ester diol, polyadipate new penta 2
One of alcohol -1,6-HD esterdiol or in which at least two mixture；The curing agent is the own diisocyanate of 1,6-
Ester, isophorone diisocyanate, benzene dimethylene diisocyanate, Methylcyclohexyl diisocyanate, dicyclohexyl methyl hydride
One of diisocyanate or in which at least two mixture.
Embodiment 1
It include substrate layer 0 and structure sheaf 1 as shown in figure 4, interval apex angle wobble structure brightness enhancement film provided by the invention,
Middle structure sheaf 1 includes the prism structure of tiling, and cross section isosceles triangle does interval when longitudinally extending along prism and shakes, triangle
Shape vertex is the half period of sine curve convex state along the trajectory line that longitudinal profile is presented.Prism spacing W is 24 μm, prism
Bottom edge L=W, shake be spaced in vertex angle theta be 90 degree, shake cycle T is 250 μm, and shake interval D is shake 25 times of cycle T,
Shaking the difference of height A in the period is 2.5 μm.Substrate layer is with a thickness of 0.1mm, material PET.The prism material of structure sheaf is solid for light
Change resin urethane acrylate.
Embodiment 2
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the prism spacing W is 10 μm.
Embodiment 3
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the prism spacing W is 100 μm.
Embodiment 4
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the prism spacing W is 20 μm.
Embodiment 5
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the prism spacing W is 50 μm.
Embodiment 6
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the prism spacing W is 40 μm.
Embodiment 7
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, it is 60 degree that the shake, which is spaced interior vertex angle theta,.
Embodiment 8
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, it is 120 degree that the shake, which is spaced interior vertex angle theta,.
Embodiment 9
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, it is 85 degree that the shake, which is spaced interior vertex angle theta,.
Embodiment 10
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, it is 95 degree that the shake, which is spaced interior vertex angle theta,.
Embodiment 11
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the shake period is that T is 50 μm
Embodiment 12
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the shake period is that T is 500 μm
Embodiment 13
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the shake period is that T is 200 μm
Embodiment 14
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the shake period is that T is 300 μm
Embodiment 15
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the shake interval D is 1 times for shaking cycle T.
Embodiment 16
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the shake interval D is 5 times for shaking cycle T.
Embodiment 17
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the shake interval D is 50 times for shaking cycle T.
Embodiment 18
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the shake interval D is 40 times for shaking cycle T.
Embodiment 19
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the difference of height A in the shake period is 0.5 μm.
Embodiment 20
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the difference of height A in the shake period is 5 μm.
Embodiment 21
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the difference of height A in the shake period is 2 μm.
Embodiment 22
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the difference of height A in the shake period is 3 μm.
Embodiment 23
As shown in figure 5, interval apex angle wobble structure brightness enhancement film (containing diffusion layer) provided by the invention, includes substrate layer 0, knot
Structure layer 1 and diffusion layer 2, wherein structure sheaf 1 includes the prism structure of tiling, and cross section isosceles triangle longitudinally extends along prism
When do interval and shake, the trajectory line that triangular apex is presented along longitudinal profile is the half period of sine curve convex state.Rib
Mirror spacing W is 24 μm, the bottom edge L=W of prism, and it is 90 degree that shake, which is spaced interior vertex angle theta, and shake cycle T is 250 μm, shakes interval D
For 25 times for shaking cycle T, shaking the difference of height A in the period is 2.5 μm.Substrate layer is with a thickness of 0.1mm, material PET.Structure
The prism material of layer is light-cured resin urethane acrylate.Diffusion layer is by PBMA particle and light-cured resin polyurethane propylene
Acid esters is constituted, and the particle diameter distribution of PBMA particle is 3~15 μm, and PBMA particle accounting is 20% (total with resin relative to particle
Amount)；
Embodiment 24
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 23 provides, the particle diameter distribution of the diffusion layer particle is 3~5
μm, PBMA particle accounting is 5%.
Embodiment 25
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 23 provides, the particle diameter distribution of the diffusion layer particle is 3~
15 μm, PBMA particle accounting is 8%.
Embodiment 26
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 23 provides, the particle diameter distribution of the diffusion layer particle is 3~
30 μm, PBMA particle accounting is 30%.
Embodiment 27
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 23 provides, the particle diameter distribution of the diffusion layer particle is 3~
30 μm, PBMA particle accounting is 65%.
Embodiment 28
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 23 provides, the particle of the diffusion layer is PMMA material.
Embodiment 29
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 23 provides, the particle of the diffusion layer is PA material.
Embodiment 30
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 23 provides, the particle of the diffusion layer is PU material.
Embodiment 31
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the substrate layer is with a thickness of 0.03mm.
Embodiment 32
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the substrate layer is with a thickness of 0.25mm.
Embodiment 33
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the substrate layer material is PBT.
Embodiment 34
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the substrate layer material is PC.
Embodiment 35
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the structure sheaf material is light-cured resin epoxy
Acrylate.
Embodiment 36
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the triangular apex is in along longitudinal profile
Existing trajectory line is arc.
Embodiment 37
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the triangular apex is in along longitudinal profile
Existing trajectory line is one trapezoidal, and trapezoidal top margin length is 50 μm.
Embodiment 38
Such as the interval apex angle wobble structure brightness enhancement film that embodiment 1 provides, the triangular apex is in along longitudinal profile
Existing trajectory line is a triangle.
Comparative example 1
As shown in Fig. 2, the contour feature optical brightness enhancement film of tradition for comparison, comprising substrate layer 0 and structure sheaf 1, wherein
Structure sheaf 1 includes the prism structure of tiling, and cross section isosceles triangle does not change when longitudinally extending along prism, triangle
Vertex is straight line along the trajectory line that longitudinal profile is presented.Prism spacing W is 24 μm, and prism vertex angle θ is 90 degree.
Comparative example 2
As shown in figure 3, the continuous wobble structure optical brightening membrane up and down of tradition for comparison, includes substrate layer 0 and structure
Layer 1, wherein structure sheaf 1 includes the prism structure of tiling, and cross section isosceles triangle is done on continuous when longitudinally extending along prism
Lower shake, triangular apex are the half period of sine curve convex state along the trajectory line that longitudinal profile is presented.Prism spacing W
It is 24 μm, it is 90 degree that prism vertex angle θ, which is fixed, and shake cycle T is 500 μm (being higher by reference line part is 250 μm), shakes the period
Interior difference of height A is 5 μm (being equally higher by 2.5 μm of reference line).
The evaluation present invention provides the main performance of brightness enhancement film in the following manner.
Anti- adsorption effect: reflectance coating+light guide plate+diffusion barrier+difference brightness enhancement film+comparative example 1 bright enhancement film (fixation is not changed),
It is lighted with after module group assembling, the Newton's ring or water ripples generated after all angles observation absorption.
Opinion rating: excellent > good > in > bad > poor
Luminance: reflectance coating+light guide plate+diffusion barrier+difference brightness enhancement film --- conventional backlit framework, with point after module group assembling
It is bright, 9 luminance average values are tested using BM-7.
Opinion rating: excellent > good > in > bad > poor
The performance comparison of 1 embodiment 1-38 of table, comparative example 1,2
The comparison of table 1-1 embodiment 1-6
| Project | W(μm) | θ(°) | T(μm) | D/T | A(μm) | Anti- absorption | Brightness | Difficulty of processing |
| Embodiment 1 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 2 | 10 | 90 | 250 | 25 | 2.5 | In | It is bad | It is difficult |
| Embodiment 3 | 100 | 90 | 250 | 25 | 2.5 | It is excellent | It is excellent | It is difficult |
| Embodiment 4 | 20 | 90 | 250 | 25 | 2.5 | In | In | Generally |
| Embodiment 5 | 50 | 90 | 250 | 25 | 2.5 | It is excellent | It is excellent | Generally |
| Embodiment 6 | 40 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
By the comparing result of embodiment 1-6 in table 1-1 it can be found that the variation of prism spacing W will affect anti-adsorption effect
And brightness.Other conditions are constant, and when prism spacing W becomes larger, anti-adsorption effect improves, and luminance improves.However, when W is less than 24 μ
M and be greater than 40 μm when, difficulty of processing is begun to ramp up, especially less than 20 μm and be greater than 50 μm when, processing becomes difficult: W is too
Small, machining accuracy is not achieved；W is too big, and repeatedly cutting is needed just to be able to satisfy working depth, and process time is elongated, and tool wear becomes
Weight.Therefore, ensure at the same time performance meet it is good meet with excellent and difficulty of processing generally with readily under the premise of, the preferred model of W
Enclose is 24-50 μm.
The comparison of table 1-2 embodiment 1,7-10
| Project | W(μm) | θ(°) | T(μm) | D/T | A(μm) | Anti- absorption | Brightness | Difficulty of processing |
| Embodiment 1 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 7 | 24 | 60 | 250 | 25 | 2.5 | It is good | It is bad | It is difficult |
| Embodiment 8 | 24 | 120 | 250 | 25 | 2.5 | It is good | It is bad | It is easy |
| Embodiment 9 | 24 | 85 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 10 | 24 | 95 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
By embodiment 1 in table 1-2,7-10 comparing result it can be found that the variation of prism vertex angle θ will affect brightness plus
Work difficulty, but have substantially no effect on anti-adsorption effect.Other conditions are constant, and when prism vertex angle θ is 85-95 °, luminance is best, processing
Also it is easy.60 ° of difficulty of processing is easy to burst apart when cutting from steep angle cutter.
The comparison of table 1-3 embodiment 1,11-14
| Project | W(μm) | θ(°) | T(μm) | D/T | A(μm) | Anti- absorption | Brightness | Difficulty of processing |
| Embodiment 1 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 11 | 24 | 90 | 50 | 25 | 2.5 | In | It is good | It is difficult |
| Embodiment 12 | 24 | 90 | 500 | 25 | 2.5 | In | It is good | It is easy |
| Embodiment 13 | 24 | 90 | 200 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 14 | 24 | 90 | 300 | 25 | 2.5 | It is good | It is good | It is easy |
By embodiment 1 in table 1-3,11-14 comparing result it can be found that the variation of shake cycle T will affect anti-absorption
Effect, but brightness is influenced little.Other conditions are constant, and shake cycle T is bigger or more hour, anti-adsorption effect are deteriorated.It is theoretical
On, as long as D/T immobilizes, the ratio of luminance loss caused by shaking is close, therefore brightness should change less.And needle
Adsorption effect is fought, when the shake period is too big, under fixed difference of height, curve becomes flat and (is equal to adsorption area increase)；
And shake the period it is too small when, under fixed difference of height, although curve becomes sharply, the adsorption area of single-point becomes smaller, unit plane
The density of lower of product increases, therefore anti-adsorption effect also declines.Furthermore when T is 50 μm, the cutting of shake section can be become difficult, and
Cutter completion feed and withdrawing, processing within the very short time (distance) is asked to become difficult.Therefore, the shake period should be preferably
200-300 μm or so.
The comparison of table 1-4 embodiment 1,15-18
| Project | W(μm) | θ(°) | T(μm) | D/T | A(μm) | Anti- absorption | Brightness | Difficulty of processing |
| Embodiment 1 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 15 | 24 | 90 | 250 | 1 | 2.5 | It is bad | It is bad | It is easy |
| Embodiment 16 | 24 | 90 | 250 | 5 | 2.5 | In | In | It is easy |
| Embodiment 17 | 24 | 90 | 250 | 50 | 2.5 | It is excellent | It is excellent | It is easy |
| Embodiment 18 | 24 | 90 | 250 | 40 | 2.5 | It is excellent | It is excellent | It is easy |
| Comparative example 2 | 24 | 90 | 500 | / | 5 | It is bad | Difference | It is easy |
By embodiment 1 in table 1-4,15-18 comparing result it can be found that shake interval D and shaking the multiple meeting of cycle T
Influence anti-adsorption effect and brightness.Multiple is bigger, and anti-adsorption effect is better, and brightness is higher.(the embodiment when multiple is 1 times
15), there is no improvement (compared with comparative example 2) is embodied in anti-absorption, only there is certain embodiment in brightness.When multiple is 5, two
Kind performance all makes moderate progress.When multiple is 25, improve obvious.And when multiple 40-50, improvement is best.Therefore the multiple of D/T
Preferably 5-50, further preferably 25-50.
The comparison of table 1-5 embodiment 1,19-22
| Project | W(μm) | θ(°) | T(μm) | D/T | A(μm) | Anti- absorption | Brightness | Difficulty of processing |
| Embodiment 1 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 19 | 24 | 90 | 250 | 25 | 0.5 | In | It is excellent | It is difficult |
| Embodiment 20 | 24 | 90 | 250 | 25 | 5 | It is excellent | In | It is easy |
| Embodiment 21 | 24 | 90 | 250 | 25 | 2 | It is good | It is good | It is easy |
| Embodiment 22 | 24 | 90 | 250 | 25 | 3 | It is good | It is good | It is easy |
By embodiment 1 in table 1-5,19-22 comparing result it can be found that the difference of height A shaken in the shake period can shadow
Ring anti-adsorption effect and brightness.Difference of height A is bigger, and anti-adsorption effect is better, and brightness is then lower.For anti-adsorption effect and brightness
Balance, A is preferably 2-3 μm.
The comparison of table 1-6 embodiment 1,23-30
By embodiment 1 in table 1-6,23-30 comparing result it can be found that when brightness enhancement film includes diffusion layer 2, diffusion layer
Itself be do not have on the anti-adsorption effect of prism structure it is influential, because anti-adsorption effect is for the diaphragm back side of upper layer.Although
The ratio of the diffusion particle of diffusion layer can have an impact to brightness, and the ratio of particle is bigger, and brightness is then lower, but different embodiments
The ratio of particle be in being actually used according to product required concealing come selection.Comparison including embodiment 23,28-30, says
Bright different particle material nor affects on the anti-adsorption effect of Facad structure, has substantially no effect on brightness.
The comparison of table 1-7 embodiment 1,31-35
| Project | W(μm) | θ(°) | T(μm) | D/T | A(μm) | Anti- absorption | Brightness | Difficulty of processing |
| Embodiment 1 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 31 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is excellent | It is easy |
| Embodiment 32 | 24 | 90 | 250 | 25 | 2.5 | It is good | In | It is easy |
| Embodiment 33 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 34 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 35 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
By embodiment 1 in table 1-7,31-35 comparing result it can be found that as long as prism structure is identical: (A) blast
The optional 0.03-0.25mm of the thickness of substrate layer described in film, anti-adsorption effect does not change, though brightness is higher when thinner thickness,
But the result is also consistent with its application field, for example, thin substrate is suitable for mobile phone, plate, the requirement to brightness can more in itself
It is high；(B) material of substrate layer described in brightness enhancement film optional PET, PBT, PC, anti-adsorption effect do not change, and because of these types of material
Matter refractive index difference is little, thus brightness is also without influence；(C) the optional epoxy of material light-cured resin of structure sheaf described in brightness enhancement film
Esters of acrylic acid or polyurethane acroleic acid lipid, anti-adsorption effect do not change, and brightness also (has been kept without variation in this example
Resin index is consistent).
The comparison of table 1-8 embodiment 1,36-38
| Project | W(μm) | θ(°) | T(μm) | D/T | A(μm) | Anti- absorption | Brightness | Difficulty of processing |
| Embodiment 1 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 36 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 37 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good | It is easy |
| Embodiment 38 | 24 | 90 | 250 | 25 | 2.5 | It is excellent | It is excellent | It is difficult |
By embodiment 1 in table 1-8,36-38 comparing result it can be found that triangular apex is presented along longitudinal profile
Trajectory line confrontation adsorption effect and brightness have certain influence.In general, trajectory line is more convex, anti-adsorption effect is better, brightness
It is higher, but difficulty of processing is bigger, and the sequence of the convex degree of curve should be arc < sine curve convex state half period ≈ ladder
Shape < triangle.However embodiment recited herein, since cycle T is much larger than A, thus difference is not obvious.Only triangle has
The advantage of certain anti-absorption and brightness, because its top is relatively sharp, contact area is smaller, however because of this,
The short distance cutting of top end is also its processing difficulties place.The preferred arc of trajectory line, sine curve convex state in the present invention
Half period and trapezoidal.
In the Mold Making of prism layer, any type of shake track is all that electric current (voltage) letter is provided by shake machine
Number source, to control the position that cutter is carved into.Sinusoidal state is most basic signal source, is easiest to provide.Other any forms
Signal include arc, trapezoidal, triangle can by Fourier transformation, disassemble at various sinusoidal superpositions.But
It is general all can be much more complex, especially arc.Therefore, the half period of the preferred sine curve convex state of trajectory line in the present invention.
The performance comparison of table 1-9 embodiment 1, comparative example 1,2
| Project | W(μm) | θ(°) | T(μm) | D/T | A(μm) | Anti- absorption | Brightness |
| Embodiment 1 | 24 | 90 | 250 | 25 | 2.5 | It is good | It is good |
| Comparative example 1 | 24 | 90 | / | / | 0 | Difference | It is excellent |
| Comparative example 2 | 24 | 90 | 500 | / | 5 | It is bad | Difference |
By the comparing result of embodiment 1 in table 1-9 and comparative example 1,2 it can be found that interval apex angle wobble structure brightness enhancement film
(embodiment 1), brightness are much better than traditional continuous shake knot close to traditional contour feature optical brightness enhancement film (comparative example 1)
Structure optical brightening membrane (comparative example 2).And anti-adsorption effect is much better than comparative example 1, while also relatively comparison 2 is excellent.
In conclusion the anti-adsorption effect of interval apex angle wobble structure brightness enhancement film provided by the invention is preferable, brightness is higher.
Particularly, embodiment 1, the brightness enhancement film of 5-6,9-10,13-14,17-18,21-22,24-25,31,33-37, production obtained
The comprehensive performance of product is fine；Particularly, the brightness enhancement film of embodiment 5,17,18, the excellent combination property of product obtained；Into one
Step, the brightness enhancement film of embodiment 17,18, the excellent combination property of product obtained.
It should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to limit protection of the invention
Range.The equivalent changes and modifications that all contents according to the present invention are done, are encompassed by the scope of the patents of the invention.
Claims (7)
1. a kind of interval apex angle wobble structure brightness enhancement film, which is characterized in that the brightness enhancement film includes substrate layer and is attached to substrate
The structure sheaf of layer upper surface；The structure sheaf includes several prism structures；The prism structure is that cross section is isoceles triangle
The triangular prism of shape；The bottom edge L of isosceles triangle corresponding to the same triangular prism is equal and is located at substrate layer upper surface；It is described etc.
Height variation of the vertex of lumbar triangle shape in longitudinal profile；The height variation on the vertex is periodic；One
A period includes shake cycle T and shake interval D；The shake cycle T is 50-500 μm；The shake interval D is shake week
1-50 times of phase T.
2. brightness enhancement film according to claim 1, which is characterized in that the form and dimension of several triangular prisms is identical
And it is parallel to each other；The spacing of the triangular prism is the top of two isosceles triangle of adjacent two triangular prisms in same cross section
Distance between point, is indicated with W, and W is 10-100 μm.
3. brightness enhancement film according to claim 1, which is characterized in that in the shake period isosceles triangle vertex along
The trajectory line that triangular prism longitudinal profile is presented be half period of sine curve convex state, arc, it is trapezoidal, in triangle one
Kind.
4. brightness enhancement film according to claim 1, which is characterized in that the shake interval D is to shake the 5-50 of cycle T
Times.
5. brightness enhancement film according to claim 1, which is characterized in that the highest point in the shake period, relatively shake interval
On the basis of lifting degree be shake the period in difference of height, indicated with A, A be 0.5-5 μm.
6. brightness enhancement film according to claim 1, which is characterized in that the apex angle that the shake is spaced interior isosceles triangle is used
θ indicates that it is 60-120 ° that θ, which is fixed,.
7. brightness enhancement film according to claim 1, which is characterized in that the brightness enhancement film also includes diffusion layer, the diffusion
Layer is attached to the lower surface of substrate layer.
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| US20090073564A1 (en) * | 2007-09-14 | 2009-03-19 | Ching-Bin Lin | Optical film having light-scattering substrate and the process thereof |
| CN203164450U (en) * | 2012-11-30 | 2013-08-28 | 张家港康得新光电材料有限公司 | Brightness enhancement film with scratch resistant function and liquid crystal display |
| CN203836775U (en) * | 2014-05-23 | 2014-09-17 | 北京京东方显示技术有限公司 | Backlight module, prismatic lens of backlight module and display device |
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