CN206292493U

CN206292493U - Wavelength conversion sheet diaphragm, wavelength conversion sheet and back light unit

Info

Publication number: CN206292493U
Application number: CN201621040517.4U
Authority: CN
Inventors: 正田亮
Original assignee: Toppan Printing Co Ltd
Current assignee: Toppan Inc
Priority date: 2015-09-07
Filing date: 2016-09-06
Publication date: 2017-06-30
Anticipated expiration: 2026-09-06

Abstract

The utility model provides wavelength conversion sheet diaphragm, wavelength conversion sheet and back light unit.A kind of above-mentioned wavelength conversion sheet has with diaphragm：1st film, the 1st film has the 1st base material and the 1st barrier layer being arranged on a face of the 1st base material；Adhesive linkage；With the 2nd film, the 2nd film have the 2nd base material, wherein, the face of the 1st barrier layer side of the 1st film is laminated by relative by the adhesive linkage with the 2nd base material of the 2nd film in the way of.A kind of above-mentioned wavelength conversion sheet diaphragm can also be following structures, i.e. it has：1st film, the 1st film has the 1st base material and the 1st barrier layer being arranged on a face of the 1st base material；Adhesive linkage；With the 2nd film, 2nd film has the 2nd base material and the 2nd barrier layer being arranged on a face of the 2nd base material, wherein, the face of the 1st barrier layer side of the 1st film is laminated by relative by the adhesive linkage with the face of the 2nd barrier layer of the 2nd film in the way of.

Description

Wavelength conversion sheet diaphragm, wavelength conversion sheet and back light unit

Technical field

The utility model is related to wavelength conversion sheet diaphragm and its manufacture method and wavelength conversion sheet and backlight list Unit.

Background technology

Liquid crystal display is the applying by voltage to control the state of orientation of liquid crystal, by each region transmission or resistance Disconnected light carrys out the display device of display image etc..As the light source of the liquid crystal display, using the back side for being arranged on liquid crystal display Backlight.Cold-cathode tube is used so far in a backlight, but recently, due to reasons such as long-life, the advantages of color development, gradually Replace cold-cathode tube using LED (light emitting diode).

In the LED for being used in a backlight, White LED technology occupies very big importance degree.With regard to White LED technology Speech, generally uses following method：The YAG for being doped with cerium is excited with cyan (450nm) LED chip：Ce (yttrium-aluminium-garnets：Cerium) under Square converting luminophore.In this case, the cyan light of LED is made and by YAG：The wave-length coverage Huang wide that Ce fluorophor is produced Colored light mixing and turn into white light.But, the white light in most cases carries fraction of cyan, usually produces " cold ", " cool Fast " the such impression of white.

Then, in recent years, the fluorophor product of the nano-scale of quantum dot has been used.So-called quantum dot, is luminous Property semi-conductor nano particles, the scope of diameter is 1~20nm or so.Quantum dot is due to the excitation spectrum of display wide scope, amount Sub- efficiency high, therefore, it is possible to be used with fluorophor as LED wavelength converts.And then, have the following advantages that：It is only big by changing point Small, semi-conducting material species, it becomes possible to luminous wavelength is fully adjusted in whole visibility region.Therefore, it can be said that amount Son point in fact under cover produces the possibility of all of color, the particularly warm white that illumination industry is strongly desired.Additionally, Emission wavelength is corresponded into 3 kinds of red, green, blue or green points to combine, colour developing can be obtained and evaluated the different white light of number.So, for The liquid crystal display of the backlight produced by quantum dot is used, compared with conventional liquid crystal display, in no increase thickness, has been disappeared In the case of power consumption power, cost, manufacturing process, tone is improved, and can show the number of colors that people is capable of identify that.

Having used the backlight of above-mentioned such White LED has following composition：Make the glimmering of the luminescent spectrum with regulation Body of light (quantum dot and YAG：Ce etc.) in film diffusion, with diaphragm by its face seal, the wavelength that edge part is also sealed sometimes Conversion sheet and LED light source and light guide plate combination.

For said protection film, film is formed by evaporation etc. on the surface of the base materials such as plastic foil, prevent moisture, gas Deterioration factor in air such as (such as oxygen) is passed through.For example, Japanese Unexamined Patent Publication 2011-013567 publications and International Publication No. In No. 2014/113562, in order to suppress the deterioration of fluorophor, it is proposed that with the knot that fluorophor is clamped with diaphragm (Obstruct membrane) The wavelength conversion sheet of structure and its backlight is used.

Utility model content

But, inventors of the present utility model have found：Even glimmering with being clamped with the diaphragm of wavelength conversion sheet The wavelength conversion sheet of the structure of body of light, if for example for a long time exposed to more than 85 DEG C of high temperature, the luminous efficiency of fluorophor Partly reduce, the exception of black streaking is referred to as sometimes.If producing black streaking in wavelength conversion sheet, display is equipped on Generation tone is bad in the case of device, show bad such problem.

The utility model in view of the problem that has of above-mentioned prior art and complete, it is therefore intended that provide and turn foring wavelength Even if can also suppress the wavelength conversion sheet protection of black streaking generation when changing piece in the case where long-time is in high temperature Film and its manufacture method and the wavelength conversion sheet and back light unit of above-mentioned wavelength conversion sheet diaphragm are used.

To achieve these goals, the utility model provides a kind of wavelength conversion sheet diaphragm, and it has：1st film, should 1st film has the 1st base material and the 1st barrier layer being arranged on a face of the 1st base material；Adhesive linkage；With the 2nd film, the 2nd film tool There is the 2nd base material, wherein, the face of the 1st barrier layer side of the 1st film is with the 2nd base material of the 2nd film by described Adhesive linkage is laminated by relative in the way of.

The thermal coefficient of expansion in the TD directions within the temperature range of 30~90 DEG C of above-mentioned wavelength conversion sheet diaphragm is excellent Elect 1.0 × 10 as^-4/ below K.

The reason for inventors of the present utility model are to producing black streaking is furtherd investigate repeatedly, as a result finds：Black streaking from The end of wavelength conversion sheet extends, and also corresponding with the position for generating black streaking in wavelength conversion sheet diaphragm The exception (crackle) of wire is there occurs at position.I.e., it is believed that be exposed in high temperature for a long time by by wavelength conversion sheet, so that ripple The barrier layer of conversion sheet diaphragm long is ftractureed with striated, due to the oxygen invaded from the part of cracking, makes phosphor degradation, is produced Raw black streaking.Additionally, it was found that the crackle of the striated stretches along the MD directions of wavelength conversion sheet diaphragm.Think to be drawn by heat The flexible generation for largely participating in crackle of the film for rising, as shown in Figure 7, by by wavelength conversion sheet diaphragm 20A is heated, and as wavelength conversion sheet with diaphragm 20B, compared with MD directions, is more significantly expanded on TD directions, in TD It is stretched on direction, (cracking) 30 is cracked in barrier layer.Further, for example, sometimes also due to being protected in wavelength conversion sheet Heat when equiwavelength's conversion sheet makes during the lamination of cuticula and fluorophor produces the crackle of barrier layer.

In this regard, according to wavelength conversion sheet diaphragm of the present utility model, by with the 1st and the 2nd film is laminated Structure, and the thermal coefficient of expansion in TD directions within the temperature range of 30~90 DEG C is 1.0 × 10^-4/ below K, so as to Enough mitigate the tensile stress on TD directions, suppress to produce the crackle of striated in barrier layer, when wavelength conversion sheet is formd, i.e., Make can also to suppress in the case of the high temperature (such as more than 85 DEG C) in long-time the generation of black streaking.

In wavelength conversion sheet diaphragm of the present utility model, above-mentioned 2nd film also includes the 2nd barrier layer, above-mentioned 2nd film The face of above-mentioned 2nd barrier layer side can be contacted with above-mentioned adhesive linkage.That is, the utility model also provides a kind of wavelength conversion sheet and uses Diaphragm, it has：1st film, the 1st film has the 1st base material and the 1st barrier layer being arranged on a face of the 1st base material；It is viscous Connect layer；With the 2nd film, the 2nd film has the 2nd base material and the 2nd barrier layer that is arranged on a face of the 2nd base material, wherein, it is described The face of the 1st barrier layer side of the 1st film and the face of the 2nd barrier layer of the 2nd film are by the adhesive linkage with relative To mode be laminated.The thermal expansion system in the TD directions within the temperature range of 30~90 DEG C of above-mentioned wavelength conversion sheet diaphragm Number is preferably 1.0 × 10^-4/ below K.In this case, more excellent barrier is obtained in that, and is foring wavelength Black streaking generation can further be suppressed during conversion sheet.

The utility model also provides a kind of manufacture method of wavelength conversion sheet diaphragm, its be have will be comprising the 1st base The face of the above-mentioned 1st barrier layer side of the 1st film of material and the 1st barrier layer is with a face of the 2nd film comprising the 2nd base material by bonding Layer laminating structure wavelength conversion sheet diaphragm manufacture method, by above-mentioned adhesive linkage will above-mentioned 2nd film and When above-mentioned 1st film is fitted, it is below 50N/m to make to the tension force that above-mentioned 2nd film applies.

In the case of industrially producing the wavelength conversion sheet diaphragm of above-mentioned composition, the 1st film is fitted with the 2nd film When, for example, using laminater, the 1st film is gone out from the film winding of web-like, the coating adhesive on the film for transporting is fitted from web-like The 2nd film that goes out of film winding.In the 1st and the 2nd film during for transport, by laminater in carriage direction (MD directions) Upper to apply tensioned, thus film turns into and is stretched in the MD direction and is pressed on the direction (TD direction) vertical with MD directions The state of contracting.Therefore, in the wavelength conversion sheet diaphragm for obtaining, there is the internal stress of compression in the MD direction, in TD There is the internal stress of stretching on direction.According to the manufacture method of wavelength conversion sheet diaphragm of the present utility model, by It is below 50N/m by the tension force for making to apply the 2nd film when bonding agent fits the 2nd film with the 1st film, can makes on TD directions The internal stress of the stretching of generation fully reduces, the result is that the TD directions of the wavelength conversion sheet diaphragm for enabling to Thermal coefficient of expansion reduce.Therefore, for the wavelength conversion sheet diaphragm for obtaining, splitting for striated is produced in barrier layer Line is suppressed, when wavelength conversion sheet is formd, even if in the case where long-time is exposed to high temperature, it is also possible to suppress black Striped is produced.Further, in the manufacture method of wavelength conversion sheet diaphragm of the present utility model, being fitted with the 2nd film in the 1st film When can use laminater, use laminating when can make to the 2nd film apply tension force for the method for below 50N/m is entered Row laminating.For example, laminater can not be used and manually fitted.

In the manufacture method of wavelength conversion sheet diaphragm of the present utility model, preferably above-mentioned 2nd film is also comprising the 2nd resistance Interlayer, in above-mentioned wavelength conversion sheet diaphragm, the face of the above-mentioned 2nd barrier layer side of above-mentioned 2nd film connects with above-mentioned adhesive linkage Touch.In this case, the wavelength conversion sheet diaphragm for obtaining is obtained in that more excellent barrier, and is foring During wavelength conversion sheet, even if also can further suppress black streaking in the case where long-time is exposed to high temperature producing.

The utility model also provides a kind of wavelength conversion sheet, and it has：Luminescent coating comprising fluorophor；With above-mentioned reality With new wavelength conversion sheet diaphragm.According to the wavelength conversion sheet, even if in the case where long-time is exposed to high temperature, The generation of black streaking can be suppressed.

The utility model also provides a kind of back light unit, and it has：LED light source；Above-mentioned wavelength convert of the present utility model Piece；With the light guide plate for making light that above-mentioned wavelength conversion sheet is incided from above-mentioned LED light source.According to the back light unit, even if when long Between can also suppress the generation of black streaking in the case of the high temperature.

According to the utility model, using the teaching of the invention it is possible to provide even if being exposed to the feelings of high temperature in long-time when wavelength conversion sheet is formd Also the wavelength conversion sheet diaphragm and its manufacture method of the generation of black streaking can be suppressed under condition and above-mentioned wavelength has been used The wavelength conversion sheet and back light unit of conversion sheet diaphragm.

Brief description of the drawings

Fig. 1 is the generalized section of the wavelength conversion sheet of the 1st implementation method of the present utility model.

Fig. 2 is the generalized section of the wavelength conversion sheet diaphragm of an implementation method of the present utility model.

Fig. 3 is the generalized section of the wavelength conversion sheet diaphragm of an implementation method of the present utility model.

Fig. 4 is the generalized section of the wavelength conversion sheet of the 2nd implementation method of the present utility model.

Fig. 5 is the generalized section of the back light unit of an implementation method of the present utility model

One schematic diagram of example of the laminater that Fig. 6 can be used when being and representing and the 1st film is fitted with the 2nd film.

Fig. 7 is the explanatory diagram for illustrating the mechanism that the crackle in wavelength conversion sheet diaphragm is produced.

Fig. 8 is thermal coefficient of expansion and temperature on the TD directions of the wavelength conversion sheet diaphragm for representing embodiment 1 and 2 The curve map of relation.

Fig. 9 is thermal coefficient of expansion and temperature on the MD directions of the wavelength conversion sheet diaphragm for representing embodiment 1 and 2 The curve map of relation.

Figure 10 is the thermal coefficient of expansion on the TD directions of the wavelength conversion sheet diaphragm for representing embodiment 2 and comparative example 1 With the curve map of the relation of temperature.

Figure 11 is the thermal coefficient of expansion on the MD directions of the wavelength conversion sheet diaphragm for representing embodiment 2 and comparative example 1 With the curve map of the relation of temperature.

[explanation of reference]

1 luminescent coating, 3 fluorophor, 4 sealing resins, 5 the 1st films, 6 adhesive linkages,

7 the 2nd films, 8 coatings, 9 the 1st base materials, 10 the 1st barrier layers,

11 inorganic thin film layers, 12 barrier properties for gases coatings, 14 the 2nd base materials,

15 the 2nd barrier layers, 16 inorganic thin film layers, 17 barrier properties for gases coatings,

18LED light sources, 19 light guide plates, 20,21,22 wavelength conversion sheet diaphragms,

52 the 1st films, 54 the 2nd films, 56 laminating films, 62 the 1st pay-off rolls,

64 the 2nd pay-off rolls, 66 takers-ins, 72 bonding agent apparatus for coating, 74 deflector rolls,

76 nip rolls, 82 baking ovens, 100,200 wavelength conversion sheets, 500 back light units,

T₁1st uncoiling tension, T₂Baking oven tension force, T₃2nd uncoiling tension, T₄Coiling tension.

Specific embodiment

Preferred embodiment explained to of the present utility model referring to the drawings.Further, in accompanying drawing, for phase Same or considerable part mark same symbol, eliminates the explanation of repetition.In addition, the dimensional ratios of accompanying drawing are not limited to the ratio of diagram Rate.

Wavelength conversion sheet diaphragm of the present utility model is characterised by, with will be comprising the 1st base material and the 1st barrier layer Face and the face of the 2nd film comprising the 2nd base material of above-mentioned 1st barrier layer side of the 1st film fitted by adhesive linkage Structure, the thermal coefficient of expansion in the TD directions within the temperature range of 30~90 DEG C of wavelength conversion sheet diaphragm is 1.0 × 10^-4/ below K.In addition, wavelength conversion sheet of the present utility model has：Luminescent coating comprising fluorophor；With above-mentioned the utility model Wavelength conversion sheet diaphragm.Below to an implementation of wavelength conversion sheet diaphragm and wavelength conversion sheet with this composition Mode is illustrated.

First, the 1st implementation method of the present utility model is illustrated.Fig. 1 is the 1st implementation method of the present utility model The generalized section of wavelength conversion sheet.Wavelength conversion sheet shown in Fig. 1 includes the fluorophor such as quantum dot, for example can be as LED wavelength converts are used in being used in back light unit.

Wavelength conversion sheet 100 shown in Fig. 1 has the luminescent coating (wavelength conversion layer) 1 comprising fluorophor and sets respectively Put the wavelength conversion sheet diaphragm (hereinafter also referred to as " protection in the face 1a sides of luminescent coating 1 and another face 1b sides Film ") 20,20 and schematic configuration.Thus, the knot that luminescent coating 1 has been wrapped into (seal) between diaphragm 20,20 is become Structure.Wherein, for luminescent coating 1, due to barrier must be assigned, will it is desirable to turn into a pair of diaphragms 20,20 of utilization The composition of the clamping of luminescent coating 1.Each layer for constituting wavelength conversion sheet 100 is described in detail below.

(luminescent coating)

Luminescent coating 1 is the film of tens of~hundreds of μm comprising sealing resin 4 and fluorophor 3 of thickness.As sealing Resin 4, for example, can use photoresist or heat-curing resin.Sealing resin 4 internal mix more than a kind it is glimmering Sealed in the state of body of light 3.Sealing resin 4 is played when luminescent coating 1 is laminated with a pair of diaphragms 20,20 and connect by them The effect for filling their space while conjunction.In addition, luminescent coating 1 can make more than 2 layers only to seal a kind of fluorescence What the luminescent coating of body 3 was laminated.The fluorophor of more than two kinds 3 used in these 1 layer or more than 2 layers of luminescent coating is selected Select excitation wavelength identical fluorophor.The wavelength that its excitation wavelength is based on the light of LED light source irradiation is selected.It is of more than two kinds The iridescent of fluorophor 3 is different from each other.Cyan LED (peak wavelength is 450nm) is being used as LED light source and using 2 kinds In the case of fluorophor 3, each iridescent is preferably red, green.The wavelength base of the light of wavelength and the LED light source irradiation of each fluorescence Selected in the dichroism of colour filter.For the peak wavelength of fluorescence, for example, red is 610nm, green is 550nm.

Next, being illustrated to the particle configuration of fluorophor 3.As fluorophor 3, preferably use excitation it is high, can be with Expect the quantum dot of the raising of brightness.Used as quantum dot, can for example include will use as diaphragm as the core of illuminating part The quantum dot that is coated to of shell.As above-mentioned core, for example, cadmium selenide (CdSe) etc. can be included, as above-mentioned shell, for example may be used Include zinc sulphide (ZnS) etc..It is coated to by the big ZnS of the surface defect band gap by the particle of CdSe, so that quantum efficiency Improve.In addition, fluorophor 3 can core be doubly coated to by the 1st shell and the 2nd shell.In this case, core can make With CdSe, the 1st shell can use the zinc selenide (ZnSe), the 2nd shell can to use ZnS.In addition, as the fluorophor beyond quantum dot 3, it is also possible to use YAG：Ce etc..

The average grain diameter of above-mentioned fluorophor 3 is preferably 1~20nm.In addition, the thickness of luminescent coating 1 is preferably 1~500 μ m。

The content of the fluorophor 3 in luminescent coating 1 counts preferably 1~20 mass % on the basis of the total amount of luminescent coating 1, More preferably 3~10 mass %.

As sealing resin 4, for example, can use thermoplastic resin, heat-curing resin and ultraviolet curing resin Deng.These resins can be used alone or be applied in combination two or more.

As thermoplastic resin, for example can using acetylcellulose, NC Nitroncellulose, acetyl group butyl cellulose, The cellulose derivative such as ethyl cellulose and methylcellulose；Vinylacetate and its copolymer, vinyl chloride and its copolymer, with And the vinyl resin such as vinylidene chloride and its copolymer；The acetal resin such as polyvinyl formal and polyvinyl butyral resin； The acrylic resin such as acrylic resin and its copolymer, metha crylic resin and its copolymer；Polystyrene resin； Polyamide；Linear polyester resin；Fluororesin；And polycarbonate resin etc..

As heat-curing resin, phenolic resin, urea-melamine resin, polyester resin and organic siliconresin can be included Deng.

As ultraviolet curing resin, epoxy acrylate, urethane acrylate and polyester third can be included The photopolymerizing prepolymers such as olefin(e) acid ester.Alternatively, it is also possible to using these photopolymerizing prepolymers as principal component, using simple function, Polyfunctional monomer is used as diluent.

(wavelength conversion sheet diaphragm)

Wavelength conversion sheet diaphragm 20 has：The 1st film 5, the and of adhesive linkage 6 with the 1st base material 9 and the 1st barrier layer 10 The 2nd film 7 with the 2nd base material 14.And, for the 1st film 5 and the 2nd film 7, by the 1st barrier layer 10 of the 1st film 5 formed face with 2nd base material 14 is laminated by adhesive linkage 6 is relative to ground.And then, set on a face 14a of the 2nd base material 14 apply as needed Layer 8.In other words, make the side away from luminescent coating 1 for the 2nd base material 14, making close to luminescent coating 1, be laminated barrier layer In the case that one side is the 1st base material 9, will have the 2nd base material 14 and the coating 8 being arranged on a face 14a of the 2nd base material 14 Film is with the film (the 1st film 5) with the 1st base material 9 and the 1st barrier layer 10 being arranged on a face 9a of the 1st base material by bonding Layer 6 be laminated so that the formation of the 1st barrier layer 10 face of the 2nd base material 14 and the 1st base material 9 it is relative to.By as such composition, energy Enough prevent the damage of the 1st barrier layer 10 during fabrication, and suppression is reduced by barrier caused by the defect of barrier layer.

As illustrated in figure 1, the 1st film 5 has the 1st base material 9 and the be arranged on a face 9a of the 1st base material 9 the 1st Barrier layer 10.

As the 1st and the 2nd base material 9,14, it is not particularly limited, preferably full light transmittance is more than 85% base material.Example Such as, as the base material of transparent high, excellent heat resistance, polyethylene terephthalate film, poly- naphthalenedicarboxylic acid second can be used Diol ester film etc..

In addition, in order to obtain excellent barrier, the thickness of the 2nd base material 14 is preferably more than 12 μm.In addition, to the 1st base The thickness of material 9 is not particularly limited, in order that the total thickness of wavelength conversion sheet 100 is thinning, preferably less than 80 μm.

Thickness of the thickness of the 2nd base material 14 preferably than the 1st base material 9 is small.Become big by making the thickness of the 1st base material 9, so as to press down The heat by the 1st base material 9 caused by the thermal history when 1 barrier layer 10 is formed of the reason for being made for the uneven thickness of the 1st film 5 Shrink, relatively diminished by making the thickness of the 2nd base material 14, so as to prevent the transmissivity of the entirety of wavelength conversion sheet diaphragm 20 Reduction, as a result can mitigate brightness disproportionation and color uneven.

Specifically, the thickness D2 of the 2nd base material 14 is preferably in the range of 4~30 μm, and the thickness D1 of the 1st base material 9 is preferably In the range of 16~80 μm.In addition, the difference D1-D2 of the thickness of the thickness of the 2nd base material 14 and the 1st base material 9 is preferably 5~76 μm In the range of.By making D2 for 4~30 μm, shape defect during lamination can be suppressed.By making D1 for 16~80 μm, can suppress The wavelength conversion sheet curling of diaphragm 20.And then, in order to realize less than 50 μm of slim wavelength conversion sheet diaphragm 20, The thickness D2 of the 2nd base material 14 is more preferably in the range of 4~20 μm, and the thickness D1 of the 1st base material 9 is more preferably 16~45 μm of model In enclosing.In addition, the difference D1-D2 of the thickness of the thickness of the 2nd base material 14 and the 1st base material 9 is more preferably in the range of 5~45 μm.

In addition, as wavelength conversion sheet 100, more being leaned on by being located at the film 7 of the 1st film 5 to the 2 with the 1st barrier layer 10 The mode of the side of luminescent coating 1 configures upper and lower diaphragm 20,20, so that the 1st barrier layer 10 can with the distance of luminescent coating 1 Close to the sealing effectiveness of the luminescent coating 1 that raising is produced by diaphragm 20.

1st barrier layer 10 is not particularly limited, inorganic thin film layer 11 and barrier properties for gases coating 12 is preferably comprised.Make It is the composition example of barrier layer, for example, can includes following compositions：1st barrier layer 10 as shown in Figure 1 is such, the 1st Inorganic thin film layer 11 is laminated on a face (single face) 9a of base material 9, and gas resistance is laminated with the inorganic thin film layer 11 Every property coating 12.

As inorganic thin film layer (inorganic oxide film layer) 11, it is not particularly limited, for example, can uses aluminum oxide, oxygen SiClx, magnesia or their mixture.Among these, from from the viewpoint of barrier, productivity ratio, preferably use aluminum oxide or Silica.

The thickness (thickness) of inorganic thin film layer 11 is preferably in the range of 5~500nm, more preferably the model of 10~100nm In enclosing.Wherein, if thickness is more than 5nm, exist and easily form uniform film, can substantially more play as gas The tendency of the function of barrier material.On the other hand, if thickness is below 500nm, can keep sufficient by film Flexibility, exists and produce cracking in the film due to external factor such as warpage, stretchings after more can positively preventing film forming Tendency.

Barrier properties for gases coating 12 is to prevent the secondary various damages in rear operation and assigning high barrier And set.From from the viewpoint of obtaining excellent barrier, the barrier properties for gases coating 12 is preferably comprised to be selected from and contains hydroxyl At least a kind in the macromolecular compound of base, metal alkoxide, metal alkoxide hydrolysate and metal alkoxide polymer is used as composition.

As the macromolecular compound containing hydroxyl, specifically, for example, polyvinyl alcohol, polyvinylpyrrolidone can be included The water soluble polymers such as ketone, starch, particularly in the case where polyvinyl alcohol has been used, barrier is the most excellent.

It is by formula in metal alkoxide：M(OR)_n(M represents the metallic atoms such as Si, Ti, Al, Zr, and R represents-CH₃、-C₂H₅Deng Alkyl, n represents integer corresponding with the valence mumber of M) represent compound.Specifically, tetraethoxysilane [Si can be included (OC₂H₅)₄], aluminium isopropoxide [A1 (the iso- C of O-₃H₇)₃] etc..Tetraethoxysilane, aluminium isopropoxide due to after hydrolysis It is more stable in the solvent of water system, therefore preferably.In addition, as the hydrolysate and polymer of metal alkoxide, such as tetrem The hydrolysate of TMOS, polymer, can include silicic acid (Si (OH)₄) etc.；As the hydrolysate of aluminium isopropoxide, polymerization Thing, can include aluminium hydroxide (Al (OH)₃) etc..

The thickness (thickness) of barrier properties for gases coating 12 is preferably in the range of 50~2000nm, more preferably 100~ In the range of 500nm.Wherein, if thickness is more than 50nm, there is the tendency for being obtained in that more sufficient barrier properties for gases, If below 2000nm, existing can keep sufficient flexible tendency by film.

Fig. 2 is the figure of the variation for representing the wavelength conversion sheet diaphragm in present embodiment.Such as the wavelength convert of Fig. 2 Like that, barrier layer may be disposed at another face for the 2nd base material 14 that coating 8 is provided with a face 14a to piece diaphragm 21 On 14b.That is, the 2nd film 7 can have：2nd base material 14；And formed on the face 14b with the opposition side of coating 8 of the 2nd base material 14 The 2nd barrier layer 15 comprising inorganic thin film layer 16 and barrier properties for gases coating 17.So, in the 1st base material 9 and the 2nd base material 14 Between be clamped with the 1st and the 2nd barrier layer 10,15, in addition, by by the 2nd barrier layer 15 configure closer to luminescent coating 1 portion Position, even if so that in the case of for example generating the defects such as small pinprick in the 1st barrier layer 10 or the 2nd barrier layer 15, Barrier property can more effectively be played.Inorganic thin film layer 16 and barrier properties for gases coating 17 can be used and above-mentioned nothing Machine film layer 11 and the same composition of barrier properties for gases coating 12.

Fig. 3 is the figure of another variation for representing the wavelength conversion sheet diaphragm in present embodiment.Such as the wavelength of Fig. 3 Like that, the 1st barrier layer 10 can have inorganic thin film layer 11 and barrier properties for gases coating more than 12 conversion sheet diaphragm 22 The structure being laminated.Especially, alternately it is laminated by by inorganic thin film layer 11 and barrier properties for gases coating 12, Neng Goutong Cross the presence of barrier properties for gases coating 12 and other inorganic thin film layers 11 and prevent the small pinprick of inorganic thin film layer 11 Etc. defect, it is possible to increase barrier property.

1st barrier layer 10 and the 2nd barrier layer 15 can contain grappling coating as needed.In order to improve the 1st and the 2nd base material 9, Adaptation between 14 and inorganic thin film layer 11,16, sets grappling coating between them.In addition, grappling coating can also have Having prevents moisture, the barrier of the transmission of oxygen.

Grappling coating for example can be using selected from polyester resin, isocyanate resin, polyurethane resin, acrylic acid series tree Fat, polyvinyl alcohol resin, ethylene-vinyl alcohol resin, vinyl modified resin, epoxy resin, the resin of Han You oxazolinyls, change Resin in property styrene resin, modified organic silicone resin or alkyl titanate etc. is formed.Grappling coating can be used alone Above-mentioned resin or formed using the compound resin that two or more is combined by above-mentioned resin.

The thickness of grappling coating is preferably in the range of 5~500nm, in the range of more preferably 10~100nm.Wherein, If thickness is more than 5nm, in the presence of the adaptation between the 1st and the 2nd base material 9,14 and inorganic thin film layer 11,16 and for water Point, the tendency that improves of the barrier of oxygen；If below 500nm, then presence can form the internal stress caused by thick film and obtain The tendency of the conforming layer of abundant suppression is arrived.

As illustrated in figures 1-3, in order to the 1st film 5 is fitted stacking with the 2nd film 7, adhesive linkage 6 is arranged on the 1st film 5 Between the 2nd film 7.As adhesive linkage 6, it is not particularly limited, acrylic material, polyurethane series material, polyester can be used The bonding agent or adhesive of based material etc..More specifically, acrylic adhesive, acrylic acid series bonding agent, poly- ammonia can be used Any one of ester system bonding agent, ester system bonding agent.

In addition, as the thickness of adhesive linkage 6, be not particularly limited, in order that wavelength conversion sheet diaphragm and wavelength turn The gross thickness for changing piece is thinning, preferably less than 10 μm.On the other hand, from from the viewpoint of obtaining better cementability, bonding The thickness of layer 6 is preferably more than 3 μm.

In order to play optical function, the anti-static function of more than 1, coating 8 is arranged at 2 wavelength conversion sheets and is protected On cuticula 20, two surfaces of 20 respective surfaces, i.e. wavelength conversion sheet 100.Wherein, as optical function, it is not particularly limited, Anti-interference striped (Moire fringe) function can be included, reflection function, diffusion function etc. is prevented.Among these, coating 8 is preferably extremely There is anti-interference striped function less as optical function.In present embodiment, at least there is anti-interference striped function to coating 8 Situation is illustrated.

Coating 8 is constituted containing resin glue and particulate.Furthermore, it is possible to by by particulate imbed resin glue in A part for particulate is set to expose from the surface of coating 8, it is fine concavo-convex so as to be produced on the surface of coating 8.By in this wise will Coating 8 is arranged at wavelength conversion sheet diaphragm 20, on two surfaces of 20 respective surfaces, i.e. wavelength conversion sheet 100, so as to Enough generations for substantially more preventing the interference fringes such as Newton's ring, as a result can obtain high efficiency and fine, long-life aobvious Show device.Further, coating 8 can be only arranged at the wavelength conversion sheet surface of diaphragm 20, the i.e. wavelength conversion sheet 100 of a side A face on, even if being also obtained in that the effect above in this case.

As resin glue, it is not particularly limited, transparent excellent resin optically can be used.More specifically Ground, for example, can use polyester based resin, acrylic resin, propenoic methyl carbamate system resin, polyester acrylate system Resin, urethane acrylate system resin, polyurethane series resin, epoxy system resin, polycarbonate-based resin, polyamide-based tree Thermoplastic resin, heat-curing resin, the ionizing radiations such as fat, polyimides system resins, melamine system resin, phenolic aldehyde system resin are solid The property changed resin etc..Among these, the excellent acrylic resin of light resistance, optical characteristics is preferably used.These are not only a kind, And multiple combination can also be used.

As particulate, it is not particularly limited, for example, can uses silica, clay, talcum, calcium carbonate, calcium sulfate, sulphur The inorganic particles such as sour barium, titanium oxide, aluminum oxide, and styrene resin, polyurethane resin, organic siliconresin, acrylic acid series tree The organic fine particles such as fat.These particulates can not only use a kind, and can also use multiple combination.

The average grain diameter of particulate is preferably 0.1~30 μm, more preferably 0.5~10 μm.If the average grain diameter of particulate is More than 0.1 μm, then there is the tendency of the function of the anti-interference striped for obtaining excellent；If less than 30 μm, then in the presence of the transparency The tendency for further improving.

The content of the particulate in coating 8 counts preferably 0.5~30 mass %, more preferably 3 on the basis of the total amount of coating 8 ~10 mass %.If the content of particulate is more than 0.5 mass %, there is light diffusion function and prevent the generation of interference fringe Effect further improve tendency；If below 30 mass %, luminance-reduction will not be made.

TD side of such wavelength conversion sheet for constituting with diaphragm 20 within the temperature range of 30~90 DEG C with more than To thermal coefficient of expansion be necessary for 1.0 × 10^-4/ below K.That is, the thermal expansion in the TD directions within the temperature range of 30~90 DEG C The maximum of coefficient is necessary for 1.0 × 10^-4/ below K.Wherein, the thermal coefficient of expansion in TD directions can be (thermomechanical to divide using TMA Analysis) determine.Condition determination can for example be set to load：50mN, programming rate：5 DEG C/min, design temperature：30~150 DEG C.It is logical It is 1.0 × 10 to cross above-mentioned thermal coefficient of expansion^-4/ below K, can suppress to be produced in barrier layer (the 1st barrier layer 10 and the 2nd barrier layer 15) The crackle of raw striated, when wavelength conversion sheet 100 is formd, even if in the case of being exposed to high temperature for a long time, it is also possible to press down The generation of black streaking processed.From from the viewpoint of more fully obtaining the effect above, above-mentioned thermal coefficient of expansion is preferably 0.8 × 10^-4/ Below K, more preferably 0.5 × 10^-4/ below K, more preferably 0.3 × 10^-4/ below K.In addition, for above-mentioned thermal expansion The lower limit of coefficient, is not particularly limited, and usual above-mentioned thermal coefficient of expansion is -0.8 × 10^-4/ more than K.

In addition, from the viewpoint of black streaking is produced when being exposed from long-time is more fully suppressed in high temperature, wavelength convert The thermal coefficient of expansion in TD direction of the piece diaphragm 20 preferably within the temperature range of 30~110 DEG C is 1.0 × 10^-4/ below K, More preferably 0.8 × 10^-4/ below K, more preferably 0.5 × 10^-4/ below K, particularly preferably 0.3 × 10^-4/ below K.

For the wavelength conversion sheet thermal expansion system in the MD directions within the temperature range of 3 0~90 DEG C of diaphragm 20 Number, is not particularly limited, and usually -1.5 × 10^-4/ more than K and 1.5 × 10^-4/ below K.

It is used as protecting the glimmering of wavelength conversion sheet 100 by by the wavelength conversion sheet diaphragm 20 with above-mentioned composition The diaphragm of body of light, can to greatest extent play the performance of the wavelength conversion sheet 100 for having used the fluorophor such as quantum dot.

Next, being illustrated to the manufacture method of the wavelength conversion sheet 100 of present embodiment.The wavelength of present embodiment In the manufacture method of conversion sheet 100, for example, luminescent coating 1 can be layered in into a pair of wavelength conversion sheets according to following program With between diaphragm 20,20.

The manufacturing process of diaphragm 20 (wavelength conversion sheet with)

In manufacturing process of the wavelength conversion sheet with diaphragm 20,20, first, the shape on a face 14a of the 2nd base material 14 Into coating 8.Specifically, it is coated with resin glue, particulate and makes as needed by a face 14a of the 2nd base material 14 The coating fluid that solvent is mixed, is dried, so as to form coating 8.

In addition, being laminated inorganic thin film layer 11 for example with vapour deposition method etc. on a face 9a of the 1st base material 9.Next, It is coated with the surface of inorganic thin film layer 11 with comprising selected from the macromolecular compound containing hydroxyl, metal alkoxide, metal alkoxide water The aqueous solution or water/mixed alkoxide solution of at least a kind composition etc. in solution thing and metal alkoxide polymer as host smears, It is dried, so as to form barrier properties for gases coating 12.Thus, obtain being provided with by inorganic on a face of the 1st base material 9 1st film 5 of the 1st barrier layer 10 that film layer 11 and barrier properties for gases coating 12 are made.

Next, the film of coating 8 will be formd and the 1st film 5 of the 1st barrier layer 10 is formd fitted using adhesive linkage 6, layer It is folded.Specifically, make the 2nd base material 14 (the 2nd film 7) for being provided with coating 8 relative to using viscous with the barrier layer formation face of the 1st film 5 Layer 6 is connect to be laminated.As adhesive linkage 6, can using acrylic adhesive, acrylic acid series bonding agent, urethane adhesive, Any one of ester system bonding agent.Thus, the wavelength conversion sheet diaphragm 20 for being laminated 2 films is obtained.

Further, in present embodiment, the example for forming coating 8 is illustrated first, but to forming the opportunity of coating 8 It is not particularly limited, for example, can be formed on the surface 14a of the 2nd base material 14 and applied after the 2 films laminating before forming coating 8 Layer 8.Certainly, in the case where coating 8 is not formed, then the operation is not needed.

In the present embodiment, the 1st film 5 and being fitted in for the 2nd film 7 turn into below 50N/m's to the tension force that the 2nd film applies Under the conditions of carry out.Internal stress thereby, it is possible to obtain the stretching of generation on TD directions fully reduces, the thermal expansion system in TD directions Number reduction, the wavelength conversion sheet diaphragm 20 that the crackle of generation striated in barrier layer can be suppressed.From substantially more Obtain from the viewpoint of the effect above, below 30N/m, more preferably below 15N/m are preferably to the tension force that the 2nd film applies.It is right The lower limit of the tension force that the 2nd film applies is not particularly limited, for example, can be 0N/m, or 10N/m.

As long as the method that the applying method of the 1st film 5 and the 2nd film 7 meets above-mentioned condition, is not particularly limited.Patch Conjunction can be carried out manually, in the case of industrially producing wavelength conversion sheet with diaphragm 20, it is, for example possible to use figure Laminater shown in 6 is carried out.

Fig. 6 is the schematic diagram of that represents the laminater that can be used when the 1st film 5 is fitted with the 2nd film 7. In the case of using the laminater shown in Fig. 6, fitted (bonding process) according to following program.First, by viscous Connect the coating adhesive (bonding on the barrier layer formation face of the 1st film 52 gone out from the uncoiling of the 1st pay-off roll 62 of agent apparatus for coating 72 Agent).The 1st film 52 that bonding agent will be coated with is imported in baking oven 82 by deflector roll 74, carries out the drying of bonding agent.In baking oven 82 Temperature can generally be changed with making temperature stage using 3 units, can each be set to 25~200 DEG C.After drying, by 1 film 52 imports deflector roll 74 to be transported to nip rolls 76.On the other hand, the 2nd film 54 gone out from the uncoiling of the 2nd pay-off roll 64 is transported to folder Roller 76, fits to being coated with the face of bonding agent for the 1st film 52 between nip rolls 76,76.The 1st film 52 and the 2nd between nip rolls 76,76 Pressure when film 54 is laminated can generally be set to 0.05~0.2MPa.Then, the 1st film 52 and the 2nd film 54 are pasted by bonding agent The laminating film 56 for closing is wound to takers-in 66.

In above-mentioned bonding process, the tension force T that the film for being transported will be applied₁、T₂、T₃And T₄Adjust desired model Enclose.In present embodiment, among these tension force, the 2nd film 54 is applied when the uncoiling of the 2nd film 54 is gone out and fits to 1 film 52 2nd uncoiling tension T₃It is set to below 50N/m.2nd uncoiling tension T₃Below 50N/m, preferably 10~50N/m are necessary for, more preferably It is 10~3 0N/m, more preferably 10~15N/m.By making the 2nd uncoiling tension T₃As in above range, can obtain The internal stress of the stretching of generation fully reduces on TD directions, the thermal coefficient of expansion in TD directions reduces, can suppress in obstruct Layer produces the wavelength conversion sheet diaphragm 20 of the crackle of striated.

The 1st uncoiling tension T applied to the 1st film 52 in the uncoiling of the 1st film 52₁Preferably 10~100N/m, more preferably It is 10~30N/m, more preferably 10~15N/m.

The baking oven tension force T applied to the 1st film 52 during by baking oven 82₂Preferably 10~10 0N/m, more preferably 10~ 60N/m, more preferably 10~40N/m.

The coiling tension T applied to laminating film 56 when takers-in 66 is wound to₄Preferably 10~150N/m, more preferably 10~100N/m, more preferably 10~60N/m.

The travelling speed of each film can generally be set to 5~100m/ minutes.

Curing is preferably properly selected according to material, preferably for example, 40~60 DEG C, 1~3 day.

(manufacturing process of luminescent coating 1)

In the manufacturing process of luminescent coating 1, first, by fluorophor 3 and sealing resin 4 and the solvent for using as needed Mix to prepare mixed liquor.Next, by the mixed liquor of preparation be applied to wavelength conversion sheet diaphragm 20 be not provided with apply On the surface of the side of layer 8.Next, another wavelength conversion sheet diaphragm 20 that stacking makes in addition.Now, luminescent coating 1 surface 1a, 1b are relative to ground respectively with the surface of 2 sides for being not provided with coating 8 of wavelength conversion sheet diaphragm 20 Configuration.Next, in the case where sealing resin 4 is photoresist, photoresist is solidified by ultraviolet irradiation (UV solidifications) such that it is able to obtain the wavelength conversion sheet 100 of present embodiment.Further, for photoresist, can be solid in UV Further make its heat cure after change.In addition, as sealing resin 4, in addition to photoresist, it is possible to use Thermocurable tree Fat, chemosetting resin etc..

Wherein, UV solidifications for example can be in 100~1000mJ/cm²Under carry out.In addition, heat cure for example can 6 0~ Carried out at 120 DEG C 0.1~3 minute.

Further, in present embodiment, to being not provided with shape on the face of coating 8 in wavelength conversion sheet diaphragm 20 Another wavelength conversion sheet is laminated after into luminescent coating 1, on the surface of luminescent coating 1 to be said with the example of diaphragm 20 It is bright, but it is not limited to this.

Next, being illustrated to the 2nd implementation method of the present utility model.Fig. 4 is the 2nd implementation method of the present utility model Wavelength conversion sheet generalized section.The wavelength conversion sheet of the implementation method of wavelength conversion sheet 200 and the 1st of the 2nd implementation method 100 is the composition difference of wavelength conversion sheet diaphragm 23.Therefore, it is right for the wavelength conversion sheet 200 of the 2nd implementation method Remember identical symbol with the 1st implementation method identical constituting portion minute mark, and eliminate explanation.

As is also shown in fig. 4, the wavelength conversion sheet 200 of present embodiment has the luminescent coating (ripple comprising fluorophor Conversion layer long) 1 and be separately positioned on luminescent coating 1 face 1a sides and another face 1b sides wavelength conversion sheet protection Film 23,23 is roughly constituted.Thus, become wrapped into (seal) between wavelength conversion sheet diaphragm 23,23 it is glimmering The structure of body of light layer 1.

(wavelength conversion sheet diaphragm)

The wavelength conversion sheet diaphragm 23 of present embodiment has：The 1st film with the 1st base material 9 and the 1st barrier layer 10 5th, adhesive linkage 6, the 2nd base material 14 (the 2nd film 7) and coating 8.And, the 1st base material on being provided with coating 8 on a face 9b 9, there is the 1st barrier layer 10 on another face 9a of the 1st base material 9, the 1st barrier layer 10 is by adhesive linkage 6 and the phase of the 2nd base material 14 To being laminated to ground.In other words, making the side away from luminescent coating 1 be the 1st base material 9, make a side close to luminescent coating 1 be the In the case of 2 base materials 14, the 1st base material 9, with the coating 8 being arranged on a face 9b of the 1st base material 9 and the 1st base material is arranged on Another face 9a on the 1st barrier layer 10 film (the 1st film 5) and the 2nd base material 14 by adhesive linkage 6 with the 2nd base material 14 with 1st barrier layer 10 it is relative to mode be laminated.According to the wavelength conversion sheet composition of diaphragm 23, due in the 1st barrier layer The 2nd base material 14 is configured between 10 and the luminescent coating 1 protected, even if therefore there is concavo-convex, foreign matter on luminescent coating 1 In the case of, it is also possible to impact is relaxed by the 2nd base material 14, the 1st barrier layer 10 can be suppressed and damaged.

And, when the wavelength conversion sheet 200 of present embodiment is constituted, as is also shown in fig. 4, each wavelength conversion sheet With diaphragm 23,23 so that the 2nd base material 14 is laminated towards the side of luminescent coating 1.More specifically, in wavelength conversion sheet 200 In, wavelength conversion sheet diaphragm 23,23 is laminated in the way of the 2nd base material 14 is clamped luminescent coating 1.In present embodiment In, coating 8 is also disposed in wavelength conversion sheet diaphragm 23, on 23 respective surfaces, and is arranged on wavelength conversion sheet 200 two surfaces.

In wavelength conversion sheet 200, by making the thickness of the base material 9 of Film Thickness Ratio the 1st of the 2nd base material 14 thinner, except the 1st implementation In mode beyond illustrated effect, additionally it is possible to the 1st barrier layer 10 is close to the distance of luminescent coating 1, be obtained in that suppression Effect in oxygen, moisture immersion luminescent coating 1.

Thickness of the thickness of the 1st base material 9 preferably than the 2nd base material 14 is big.Become big by making the thickness of the 1st base material 9, suppress into For the 1st film 5 uneven thickness the reason for the 1st base material 9 caused by the thermal history when 1 barrier layer 10 is formed heat receive Contracting, and for the 2nd base material 14, does not form inorganic thin film layer or barrier properties for gases coating, from without applying thermal history, Thermal contraction can be suppressed, and relatively diminished by making thickness, so as to prevent the transmission of the entirety of wavelength conversion sheet diaphragm 23 The reduction of rate, as a result can reduce brightness disproportionation and color is uneven.

From above content, the thickness D2 of the 2nd base material 14 is preferably in the range of 4~20 μm, the thickness of the 1st base material 9 D1 is preferably in the range of 16~80 μm.It it is 4~20 μm by making the thickness D2 of the 2nd base material 14, so as to be made using the 2nd base material 14 Impact relaxes, and can suppress the 1st barrier layer 10 and damage, and shape defect when can suppress to be laminated.By make D1 for 16~ 80 μm, the curling of wavelength conversion sheet diaphragm 23 can be suppressed.

In addition, wavelength conversion sheet diaphragm 23 is also in the same manner as wavelength conversion sheet diaphragm 20, the 1st embodiment party is met The condition of the thermal coefficient of expansion in the illustrated TD directions within the temperature range of 30~90 DEG C in formula.Thereby, it is possible to suppress Barrier layer produces the crackle of striated, when wavelength conversion sheet 200 is formd, even if the exposed situation of long-time at high temperature Under, it is also possible to suppress the generation of black streaking.

In addition, with the wavelength conversion sheet of Fig. 3 with the same manner as diaphragm 22, for the 1st barrier layer 10, it is also possible to by multiple Inorganic thin film layer 11 and barrier properties for gases coating 12 be laminated.Especially, by by inorganic thin film layer 11 and barrier properties for gases Coating 12 is alternately laminated, so that the defect such as small pinprick of inorganic thin film layer 11 can be by barrier properties for gases coating 12 are prevented with the presence of other inorganic thin film layers 11, it is possible to increase barrier property.

According to the wavelength conversion sheet 200 of foregoing the 2nd clear implementation method, it is obtained in that and the 1st above-mentioned implementation The same effect of the wavelength conversion sheet 100 of mode.

One implementation method of back light unit is shown in Fig. 5.The back light unit 500 of present embodiment has LED (light-emitting diodes Pipe) light source 18, light guide plate 19 and wavelength conversion sheet 100.Further, in back light unit 500, wavelength conversion sheet 200 can be used Instead of wavelength conversion sheet 100.And then, back light unit 500 can have reflecting plate, diffuser plate, prismatic lens etc., but be omitted in figure .

LED light source 18 is arranged on the side of light guide plate 19, wavelength is configured on light guide plate 19 (direct of travel of light) and is turned Change piece 100.The LED element that multiple illuminant colours are cyan is provided with the inside of LED light source 18.The LED element can be purple LED or can also be the LED of lower wavelength.LED light source is to light guide plate side-irradiation light.Using present embodiment In the case of the back light unit of wavelength conversion sheet 100, the light of the irradiation is for example incided acrylic acid series, epoxy via light guide plate Deng the layer (luminescent coating) 1 that resin and fluorophor are mixed.

Light guide plate 19 expeditiously conducts the light from the irradiation of LED light source 18, and known material can be used.As light guide plate 19, for example use acrylic acid mesentery, polycarbonate membrane and cycloolefin film etc..Light guide plate 19 can for example use silk-screen printing side The molding modes such as formula, injection moulding, extrusion molding, ink-jetting style etc. are formed.The thickness of light guide plate 19 is, for example, 100~1000 μ m。

Preferred embodiment it is illustrated in detail for of the present utility model above, but technology of the present utility model Scope is not limited to above-mentioned implementation method, and various changes can be subject in the range of purport of the present utility model not departing from.Example Such as, the composition of the wavelength conversion sheet 100,200 of the 1st and the 2nd above-mentioned implementation method, wavelength conversion sheet diaphragm 20,21, 22nd, 23, the composition of back light unit 500 is one, is not limited to this.

In addition, wavelength conversion sheet the 1st and the 2nd implementation method described above of the present utility model is like that, luminescent coating 1 can quilt Same Wavelength conversion sheet is clamped with diaphragm 20 or even 23, can also be clamped with diaphragm by differently composed wavelength conversion sheet.

In addition, wavelength conversion sheet of the present utility model can be the wavelength conversion sheet diaphragm in coated luminescent coating 1 Among the wavelength conversion sheet diaphragm of either one have coating 8 composition, or two sides wavelength conversion sheet protect Cuticula is respectively provided with the composition of coating 8.

In addition, in wavelength conversion sheet of the present utility model, being contacted with luminescent coating 1 for wavelength conversion sheet diaphragm Side face, in order to improve the cementability of wavelength conversion sheet diaphragm and luminescent coating 1, modification can be implemented, or The adhesive layer that setting is made up of polyurethane resin etc..

In addition, in wavelength conversion sheet 100,200 shown in Fig. 1 and Fig. 4, show the 1st barrier layer 10 have 1 layer it is inorganic Film layer 11 and 1 layer of situation of barrier properties for gases coating 12, but inorganic thin film layer 11 and barrier properties for gases in the 1st barrier layer 10 At least one of coating 12 can have more than 2 layers.In such a situation it is preferred to make inorganic thin film layer 11 and gas barrier Property coating 12 is alternately laminated.

And then, in the wavelength conversion sheet 100,200 shown in Fig. 1 and Fig. 4, the both ends of the surface of luminescent coating 1 are not (by ripple The end face of the left and right in the coated figure of conversion sheet diaphragm long 20,23) can be sealed with sealing resin, luminescent coating 1 is overall Can be covered by sealing resin.

[embodiment]

The utility model is further illustrated below based on embodiment and comparative example, but the utility model be not limited to Under embodiment.

[embodiment 1]

(making of wavelength conversion sheet diaphragm)

On as the single face of the thick 25 μm polyethylene terephthalate film of the 1st base material, using vacuum evaporation Silica is set to 0.05 μm of thickness as inorganic thin film layer for method, and then bag is coated with inorganic thin film layer using wet coating Coating fluid containing tetraethoxysilane and polyvinyl alcohol, the heat drying at 150 DEG C, so as to form the gas of 0.45 μm of thickness Body barrier coating.Thus, obtained being provided with by inorganic thin film layer and barrier properties for gases quilt on a face of the 1st base material 1st film of the 1st barrier layer that coating is made.

Then, on as the single face of the thick 15 μm polyethylene terephthalate film of the 2nd base material, using vacuum Silica is set to 0.05 μm of thickness as inorganic thin film layer for vapour deposition method, and then is applied on inorganic thin film layer using wet coating Coating fluid of the cloth comprising tetraethoxysilane and polyvinyl alcohol, the heat drying at 150 DEG C, so as to form 0.45 μm of thickness Barrier properties for gases coating.Thus, obtained being provided with by inorganic thin film layer and gas barrier on a face of the 2nd base material 2nd film of the 2nd barrier layer that property coating is made.

Next, using following method by the 1st film and the 2nd film so as to respective barrier layer phase using adhesive To the mode of direction fit.First, preparation is cut into the 1st film and the 2nd film of A4 sizes.On the 1st barrier layer of the 1st film Coating adhesive, after being heated 1 minute at 80 DEG C, manually places the 2nd film on the adhesive, using laminating machine in lamination temperature Spend for 60 DEG C, linear velocity are laminating (laminating manually) under conditions of 1m/ minutes.Then, cure 2 days at 50 DEG C in an oven, obtain Laminated film is arrived.In addition, as adhesive, having used host (trade name：The manufacture of X-313-405S, SAIDEN chemical company, third Olefin(e) acid system resin, solid constituent be 60.0 mass %) 20 mass parts, curing agent (trade name：K-341, SAIDEN chemical company system Make, isocyanates system resin, solid constituent are 75.5 mass %) 0.274 mass parts and the mass parts of solvent (ethyl acetate) 25 Mixture.

Next, including acrylic resin and silicon dioxide microparticle using wet coating coating on the 2nd base material of the 2nd film The coating fluid of (average grain diameter is 3 μm), forms the coating of 5 μm of thickness.Thus, the wavelength conversion sheet for having obtained A4 sizes is used Diaphragm.2 wavelength conversion sheet diaphragms are made.

(making of wavelength conversion sheet)

Will be photosensitive with epoxy as the CdSe/ZnS 530 of quantum dot (trade name, the manufacture of SIGMA-ALDRICH companies) After property mixed with resin, mixed liquor is coated the 1st substrate surface of the 1st film of above-mentioned wavelength conversion sheet diaphragm, at it The upper wavelength conversion sheet diaphragm for being laminated identical composition, is solidified by UV and is laminated, and has obtained wavelength conversion sheet.The wavelength for obtaining Conversion sheet has following compositions：The wavelength conversion sheet of Fig. 2 has been used to protect in wavelength conversion sheet 100 shown in Fig. 1 Film 21 replaces wavelength conversion sheet diaphragm 20.In addition, the size of the wavelength conversion sheet for obtaining is A4 sizes.

[embodiment 2]

1st and the 2nd film has been made using method similarly to Example 1.Used using adhesive same as Example 1 The 1st film and the 2nd film that following method will be obtained so as to respective barrier layer it is relative to the mode of direction fit. That is, using the laminater shown in Fig. 6, the value turned into the tension force that film applies shown in table 1 is adjusted such that, thus By the 1st film and the 2nd film laminating (roller laminating).In addition, the lamination beyond tension force is as described below.

(lamination)

Version：95 μm of oblique line 90L

Reversion processing

Substrate width：320mm is wide

Pressurization (backer roll) width：280mm is wide

Process velocity：10m/ minutes

Oven temperature (design temperature of the unit of baking oven 3)：60 DEG C -70 DEG C -80 DEG C since entrance side

Curing：50 DEG C, 2 days

In addition to adopting and being fitted with the aforedescribed process, obtain finally being cut into A4 sizes similarly to Example 1 Wavelength conversion sheet diaphragm and wavelength conversion sheet.

[comparative example 1]

In addition to turning into the value shown in table 1 to the tension force that film applies when being adjusted such that roller is fitted, with implementation Example 2 is similarly operated so as to obtain finally cutting into the wavelength conversion sheet diaphragm and wavelength conversion sheet of A4 sizes.

Table 1

The MD directions and TD directions of the wavelength conversion sheet diaphragm for being obtained in embodiment and comparative example, using TMA (thermo-mechanical analysis) determines thermal coefficient of expansion.Condition determination is as described below.Measurement result is shown in Fig. 8~11 and table 2.Its In, Fig. 8 is the relation of the thermal coefficient of expansion on the TD directions of the wavelength conversion sheet diaphragm for representing embodiment 1 and 2 and temperature Curve map, Fig. 9 be represent embodiment 1 and 2 wavelength conversion sheet diaphragm MD directions on thermal coefficient of expansion and temperature Relation curve map, Figure 10 is hot swollen on the TD directions of the wavelength conversion sheet diaphragm for representing embodiment 2 and comparative example 1 The curve map of the relation of swollen coefficient and temperature, Figure 11 is the MD of the wavelength conversion sheet diaphragm for representing embodiment 2 and comparative example 1 The curve map of the relation of thermal coefficient of expansion and temperature on direction.

The maximum of the thermal coefficient of expansion on the TD directions within the temperature range of 30~90 DEG C is shown in table 2.

(condition determination)

Load：50mN

Programming rate：5 DEG C/min

Design temperature：30~150 DEG C

The wavelength conversion sheet that to be obtained in embodiment and comparative example loads in 85 DEG C of baking oven, placed 100 hours and 1000 hours.Then, using the fluorescence microscope that can be observed with white light and ultraviolet (UV) both light, (Olympus is manufactured Industrial inspection microscope, trade name：MX51), the observation on wavelength conversion sheet surface is carried out, it is thus identified that the presence or absence of black streaking.Base In the confirmation result, according to following evaluation criterions, the evaluation of black streaking has been carried out.In the results are shown in table 2.

A：Even if not confirmed black streaking after placed 1000 hours to produce yet.

B：Do not confirm black streaking and produced after placing 100 hours, but confirm black streaking after placing 1000 hours Produce.

C：It is placed on and has confirmed black streaking after putting 100 hours and produce.

Table 2

Industrial applicability

As described above, according to the utility model, using the teaching of the invention it is possible to provide even if when wavelength conversion sheet is formd in high temperature Can also suppress in the case of lower long-time is exposed black streaking generation wavelength conversion sheet diaphragm and its manufacture method and The wavelength conversion sheet and back light unit of above-mentioned wavelength conversion sheet diaphragm are used.Thereby, it is possible to manufacture in the absence of tone not Fine display that is good, showing bad such problem.

Claims

1. a kind of wavelength conversion sheet diaphragm, it is characterised in that the wavelength conversion sheet has with diaphragm：

1st film, the 1st film has the 1st base material and the 1st barrier layer being arranged on a face of the 1st base material；

Adhesive linkage；With

2nd film, the 2nd film has the 2nd base material,

Wherein, the face of the 1st barrier layer side of the 1st film and the 2nd base material of the 2nd film are by the adhesive linkage It is laminated in the way of by relative.

2. wavelength conversion sheet diaphragm according to claim 1, it is characterised in that the wavelength conversion sheet diaphragm The TD directions within the temperature range of 30~90 DEG C thermal coefficient of expansion be 1.0 × 10^-4/ below K.

3. a kind of wavelength conversion sheet diaphragm, it is characterised in that the wavelength conversion sheet has with diaphragm：

Adhesive linkage；With

2nd film, the 2nd film has the 2nd base material and the 2nd barrier layer being arranged on a face of the 2nd base material,

Wherein, the face of the 1st barrier layer side of the 1st film and the face of the 2nd barrier layer of the 2nd film are by described Adhesive linkage is laminated by relative in the way of.

4. wavelength conversion sheet diaphragm according to claim 3, it is characterised in that the wavelength conversion sheet diaphragm The TD directions within the temperature range of 30~90 DEG C thermal coefficient of expansion be 1.0 × 10^-4/ below K.

5. a kind of wavelength conversion sheet, it is characterised in that the wavelength conversion sheet has：Luminescent coating comprising fluorophor；And power Profit requires the wavelength conversion sheet diaphragm any one of 1~4.

6. a kind of back light unit, it is characterised in that the back light unit has：LED light source；Wavelength described in claim 5 turns Change piece；With the light guide plate for making light that the wavelength conversion sheet is incided from the LED light source.