TW201601906A - Transfer material, method for manufacturing liquid crystal panel, and method for manufacturing liquid crystal display device - Google Patents

Abstract

An aspect of the present invention is a transfer material having a wavelength conversion member and a barrier member (B), in the stated order, on a barrier member (A) which is a provisional support body, the wavelength conversion member having a wavelength conversion layer containing quantum dots which are excited by an excitation light to emit fluorescent light. The present invention pertains to a method for manufacturing a liquid crystal panel equipped with the wavelength conversion member, and a method for manufacturing a liquid crystal display device.

Description

Transfer material, method of manufacturing liquid crystal panel, and method of manufacturing liquid crystal display device

The present invention relates to a transfer material, and more particularly to a transfer material which can be used for the manufacture of liquid crystal panels and liquid crystal display devices.

Furthermore, the present invention relates to a liquid crystal panel using the transfer material and a method of manufacturing the liquid crystal display device.

A flat panel display such as a liquid crystal display device (hereinafter also referred to as an LCD (Liquid Crystal Display)) has a small power consumption, and its use as a space-saving image display device has been expanding year by year. The liquid crystal display device is composed of at least a backlight and a liquid crystal cell, and generally includes a member such as a backlight side polarizing plate and a visual side polarizing plate.

In the flat panel display market, in order to improve LCD performance, efforts are being made to improve color reproducibility. In this regard, in recent years, quantum dots (Quantum Dot (QD) have attracted attention as a light-emitting material (refer to Patent Document 1). For example, when excitation light is incident from a backlight to a layer containing quantum dots, the quantum dots are excited to emit fluorescence (wavelength conversion) having a wavelength different from that of the excitation light. Here, by using quantum dots having different light-emitting characteristics, red light, green light, and blue light can be emitted from the wavelength conversion member. Now white light. Since the fluorescence generated by the quantum dots is small in half value width, the obtained white light has high luminance and excellent color reproducibility. With the progress of the three-wavelength light source technology using such quantum dots, the color reproduction region has been expanded from the NTSC (National Television System Committee) to 72%.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] US2012/0113672A1

Such as described above, a quantum dot is a useful material that can improve the performance of an LCD by enhancing color reproducibility.

On the other hand, in the small and medium-sized LCD market such as a tablet PC (Personal Computer) or a mobile application that has been rapidly expanding in recent years, the demand for thinning is high. This trend of thinning has also expanded to the large LCD market centered on TV. In the above-mentioned situation, research has been conducted on "thinning the glass or the film constituting the LCD" and "reducing the thickness of the LCD according to various means such as thinning the function of the member."

Accordingly, it is an object of the present invention to provide a novel means for achieving thinning of a liquid crystal display device including quantum dots as a light-emitting material.

The quantum dot has a problem that the light intensity is lowered (low light resistance) due to photooxidation reaction when exposed to oxygen. In this regard, the patent Document 1 proposes a thin film-layered barrier member (barrier layer) containing quantum dots in order to protect the quantum dots from attack by oxygen or the like. In order to more effectively protect the quantum dots from oxygen or the like, the barrier member is preferably provided on both surfaces of a wavelength conversion member having a layer including quantum dots (hereinafter also referred to as "wavelength conversion layer").

The inventors of the present invention have waited for this, and have made efforts to repeat the research in order to achieve the above object. As a result, it was found that "the two sides of the wavelength conversion member are protected by the barrier member by providing a barrier member on both surfaces of the wavelength conversion member and making the single-sided barrier member peelable (made as a temporary support). The transfer material can be manufactured by using the transfer material by peeling off the temporary support from the transfer material and bonding it to the transfer target, thereby producing a liquid crystal display device which has not been proposed in the past. According to this means, the wavelength conversion member (more specifically, the quantum dots included in the wavelength conversion layer of the wavelength conversion member) is protected by the barrier member before being transferred to the transfer object, and is assembled by transfer to After the liquid crystal display device, since the single-sided barrier member can be removed, the thickness is reduced. The surface on which the barrier member is removed is protected by the transfer object, and it is possible to prevent the quantum dot from being deteriorated by oxygen or the like.

Further, as means for achieving the reduction in thickness of the liquid crystal display device described above, it is also considered to reduce the thickness of a layer (wavelength conversion layer) including quantum dots. However, thinning a layer containing quantum dots as a light-emitting material may cause a decrease in luminous intensity and a decrease in luminance of the liquid crystal display device. On the other hand, according to the above-described transfer material, it is possible to achieve a reduction in thickness of the liquid crystal display device without depending on the thickness reduction of the wavelength conversion layer.

The present invention has been completed based on the above findings.

An aspect of the present invention relates to a transfer material which is provided on a barrier member A as a temporary support, and has a wavelength conversion layer having a wavelength conversion layer containing quantum dots excited by excitation light and emitting fluorescence. Member, and barrier member B.

In one aspect, the transfer material is a transfer material for manufacturing a liquid crystal panel.

In one aspect, the outermost surface of the barrier member A of the wavelength conversion member is an easily peelable surface.

In one aspect, the wavelength conversion member has a particle-biased existence region in which particles having a particle diameter of 100 nm or more are present in the surface layer region of the barrier member A side, and the easily peelable surface is a surface on which the particles are biased toward the existence region.

In one aspect, the wavelength conversion member has a particle-biased existence region in which particles having a particle diameter of 500 nm or more are present in the surface layer region of the barrier member A side, and the easily peelable surface is a surface on which the particles are biased toward the existence region.

In one aspect, the most surface of the wavelength converting member side of the barrier member A is an easily peelable surface.

In one aspect, the outermost layer of the wavelength conversion member side of the barrier member A is a particle-containing layer, and the surface of the particle-containing layer is the above-mentioned easy-peelable surface.

In one aspect, the outermost layer of the wavelength conversion member side of the barrier member A is an inorganic layer.

In one aspect, the barrier member A has an easy-to-adhere layer. The easy-adhesion layer may be contained in the barrier member A as a layer other than the outermost surface of the wavelength conversion member side. The outermost layer on the wavelength conversion member side is, for example, a substrate constituting the barrier member A, or an inorganic layer or an organic layer.

In one aspect, the barrier member B has an easy-to-back layer as the outermost layer on the wavelength conversion member side.

In one aspect, the barrier member A and the barrier member B each comprise at least one layer selected from the group consisting of an inorganic layer and an organic layer.

Another aspect of the present invention relates to a method of manufacturing a liquid crystal panel with a wavelength converting member, comprising: peeling a barrier member A of the transfer material; and exposing an exposed surface exposed by peeling, and including at least The surface of the liquid crystal panel of the liquid crystal cell is bonded.

In one aspect, the exposed surface is bonded to the backlight side surface of the liquid crystal panel.

In one aspect, the liquid crystal panel has a visual-side polarizing plate and a backlight-side polarizing plate sandwiching the liquid crystal cell.

Another aspect of the present invention relates to a method of manufacturing a liquid crystal display device, comprising: fabricating a liquid crystal panel with a wavelength conversion member by the above method; and assembling the liquid crystal panel and the backlight unit to assemble a liquid crystal Display device.

According to an aspect of the present invention, a transfer material which can be applied to a liquid crystal panel having a wavelength conversion member and a liquid crystal display device, a liquid crystal panel using the transfer material, and a method of manufacturing the liquid crystal display device can be provided. According to an aspect of the present invention, the protection of the quantum dots and the thinning of the liquid crystal display device can be achieved.

10‧‧‧1st film

20‧‧‧ Coating Department

22‧‧·coating film

24‧‧·Mold coating machine

26‧‧‧back roller

28‧‧‧wavelength conversion layer (hardened layer)

30‧‧‧Layer

32‧‧‧Laminating rolls

34‧‧‧heating chamber

36‧‧‧ openings

38‧‧‧ openings

50‧‧‧2nd film

60‧‧‧ Hardening Department

62‧‧‧back roller

64‧‧‧Lighting device

70‧‧‧wavelength conversion member

80‧‧‧ peeling roller

100‧‧‧Transfer material

L1‧‧‧ distance

L2‧‧‧ distance

L3‧‧‧ distance

P‧‧‧Layer position

Fig. 1 is a schematic structural view showing an example of a manufacturing apparatus of a transfer material.

Fig. 2 is a partially enlarged view of the manufacturing apparatus shown in Fig. 1.

Fig. 3 is a view showing the layer structure and evaluation results of the examples (transfer material 103, liquid crystal display device 203).

Fig. 4 is a view showing the layer structure and evaluation results of the examples (transfer material 104, liquid crystal display device 204).

Fig. 5 is a view showing the layer structure and evaluation results of the examples (transfer material 105, liquid crystal display device 205).

Fig. 6 is a view showing the layer structure and evaluation results of the examples (transfer material 106, liquid crystal display device 206).

Fig. 7 is a view showing the layer structure and evaluation results of the examples (transfer material 107, liquid crystal display device 207).

Fig. 8 is a view showing the layer structure and evaluation results of the examples (transfer material 108, liquid crystal display device 208).

Fig. 9 is a view showing the layer structure and evaluation results of the comparative example (non-transfer material 101, liquid crystal display device 201).

Fig. 10 is a view showing the layer structure and evaluation results of the comparative example (transfer material 102, liquid crystal display device 202).

[Formation of the Invention]

[Transfer material]

The transfer material of one aspect of the present invention is provided on the barrier member A as a temporary support, and is sequentially provided to have a fire containing excitation light. A wavelength conversion member of a wavelength conversion layer of a quantum dot of light, and a barrier member B. The temporary support system refers to a support that is peeled off before the transfer material is transferred to the transfer object. The temporary support (barrier member A) can protect the quantum dots contained in the wavelength conversion layer of the wavelength conversion member together with the barrier member B until the transfer. Further, as described above, the quantum dots can be protected by the transfer object and the barrier member B after the transfer. As described above, since the transfer product obtained by the transfer does not contain the barrier member A, the thickness of the liquid crystal display device can be reduced without depending on the thickness reduction of the wavelength conversion layer, and the quantum dots can be protected before and after the transfer as described above. . In addition, hereinafter, the transfer material in a state in which the temporary support is removed and removed is also referred to as a "transfer product".

Hereinafter, the above transfer material will be described in more detail.

The following description is made based on representative embodiments of the present invention, but the present invention is not limited by such embodiments. In addition, in the present invention and the present specification, the numerical range represented by "~" means a range including the numerical values described before and after "~" as the lower limit and the upper limit.

Further, in the present invention and the present specification, the "half value width" of the peak means the width of the peak at a peak height of 1/2. Further, light having an emission center wavelength in a wavelength band of 400 to 500 nm, preferably 430 to 480 nm is referred to as blue light; light having a center wavelength of emission in a wavelength band of 500 to 600 nm is referred to as green light; The light having a center wavelength of the emission in the band of 600 to 680 nm is called red light.

In the present invention and the present specification, the term "polymerizable composition" means a composition containing at least one polymerizable compound, and has a property of being cured by a polymerization treatment such as irradiation or heating. Also, "polymeric compound" A compound containing one or more polymerizable groups in one molecule. The polymerizable group is a group which can participate in the polymerization reaction. The above details are described later.

Wavelength conversion member

(wavelength conversion layer)

The transfer material is at least provided with a wavelength conversion member including a wavelength conversion layer including quantum dots excited by excitation light and emitting fluorescence. The wavelength conversion layer contains at least one type of quantum dot, and may also contain two or more kinds of quantum dots having different luminescent properties. Quantum-known quantum dots have quantum dots A having an emission center wavelength in a wavelength range of 600 nm to 680 nm, quantum dots B having an emission center wavelength in a wavelength range of 500 nm to 600 nm, and emission center wavelengths in a wavelength band of 400 nm to 500 nm. Quantum dot C; quantum dot A can be excited by excitation light to emit red light, quantum dot B can emit green light, and quantum dot C can emit blue light. For example, when blue light as excitation light is incident on a wavelength conversion layer containing quantum dots A and quantum dots B, red light emitted from quantum dots A, green light emitted from quantum dots B, and penetration wavelength are used. The blue light of the conversion layer enables white light. Alternatively, by inputting ultraviolet light as excitation light to a wavelength conversion layer containing quantum dots A, B, and C, according to red light emitted from quantum dot A, green light emitted from quantum dot B, and quantum The blue light from point C can achieve white light. Further, the ultraviolet light refers to light having a wavelength of 280 to 400 nm, preferably light having a wavelength of 280 to 380 nm.

The wavelength conversion layer can contain quantum dots in the organic matrix. In the organic matrix, a polymerizable composition containing a quantum dot (a polymerizable composition containing quantum dots) is usually polymerized by irradiation or heating, or by polymerization using light and heating (in the order of order). The shape of the wavelength conversion layer is not special It is not limited, and may be any shape such as a sheet shape, a film shape, or a rod shape. For the quantum dot, for example, JP-A-2012-169271, paragraphs 0060 to 0066, can be referred to, but is not limited thereto. As the quantum dot, a commercially available product can be used without any limitation. The wavelength of the quantum dots can usually be adjusted according to the composition, size, composition and size of the particles.

The wavelength conversion layer can be preferably produced by a coating method. Specifically, the wavelength conversion layer can be obtained by applying a polymerizable composition containing quantum dots to a substrate or the like, and then performing curing treatment by irradiation or heating, or by illuminating and heating (in order).

The polymerizable compound used for the production of the quantum dot polymerizable composition is not particularly limited. The content of the entire polymerizable compound in the total amount of the quantum dot polymerizable composition is preferably from about 10 to 99.99% by mass.

From the viewpoints of transparency, adhesion, and the like of the cured film after curing, a (meth) acrylate compound such as a monofunctional or polyfunctional (meth) acrylate monomer, or a polymer thereof, a prepolymer, or the like is preferable. . Hereinafter, one or more selected from the group consisting of a quantum dot and a (meth) acrylate compound including a monofunctional or polyfunctional (meth) acrylate monomer, a polymer thereof, and a prepolymer will be contained. The polymerizable composition is referred to as a (meth) acrylate-based polymerizable composition having a content of a sub-point. Further, in the present invention and the present specification, the term "(meth) acrylate" is used in the sense of at least one of acrylate and methacrylate, or both. The same applies to "(meth)acrylonitrile".

Examples of the monofunctional (meth) acrylate monomer include acrylic acid and methacrylic acid, and derivatives thereof. More specifically, a polymerizable unsaturated group having one (meth)acrylic acid in the molecule is exemplified. Key ((methyl) Monomer of acrylonitrile. As specific examples thereof, the compounds are exemplified below, but the invention is not limited thereto.

Examples thereof include methyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isodecyl (meth)acrylate. (meth)acrylic acid alkyl (meth)acrylate having an alkyl group such as n-octyl (meth)acrylate, lauryl (meth)acrylate or octadecyl (meth)acrylate; 1 to 30; (meth)acrylic acid An alkoxyalkyl group such as phenylmethyl ester having an aralkyl group having 7 to 20 carbon atoms and an alkoxyalkyl group such as butoxyethyl (meth)acrylate having a carbon number of 2 to 30 ( Alkoxyalkyl (meth) acrylate; N, N-dimethylaminoethyl (meth) acrylate (monoalkyl or dialkyl) aminoalkyl has a total carbon number of 1 to 20 Aminoalkyl (meth) acrylate; (meth) acrylate of diethylene glycol diethyl ether, (meth) acrylate of triethylene glycol butyl ether, monomethyl ether of tetraethylene glycol (methyl Acrylate, (meth) acrylate of hexaethylene glycol monomethyl ether, monomethyl ether (meth) acrylate of octaethylene glycol, monomethyl ether (meth) acrylate of hexaethylene glycol, two Monomethyl ether (meth) acrylate of propylene glycol, monomethyl ether (meth) acrylate of heptapropanediol a polyolefin diol alkyl ether having a carbon number of from 1 to 10 and a terminal alkyl ether having a carbon number of from 1 to 10, such as a monomethyl ether (meth) acrylate of tetraethylene glycol (A) a diol aryl ether having a carbon number of from 1 to 30 and a terminal aryl ether having a carbon number of from 6 to 20, such as a (meth) acrylate of hexaethylene glycol phenyl ether (meth) acrylate; cyclohexyl (meth) acrylate, dicyclopentenyl (meth) acrylate, isodecyl (meth) acrylate, formaldehyde addition (cyclo) trimethacrylate a (meth) acrylate having a total carbon number of 4 to 30 having an alicyclic structure; a fluorinated (meth) acrylate having a total carbon number of 4 to 30, such as heptafluorodecyl (meth) acrylate; 2-hydroxyethyl methacrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, mono (meth) acrylate of triethylene glycol, tetraethylene glycol Hydroxy (meth) acrylate, hexaethylene glycol mono(meth) acrylate, octapropylene glycol mono (meth) acrylate, glycerol mono- or di(meth) acrylate Acrylate; glycidyl (meth)acrylate, etc. Acrylate; tetraethylene glycol mono (meth) acrylate, hexaethylene glycol mono (meth) acrylate, octapropylene glycol mono (meth) acrylate and the like, the alkyl chain has a carbon number of 1 to 30 Polyethylene glycol mono (meth) acrylate; (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, 2 -hydroxyethyl (meth) acrylamide, propyl amide (Meth) acrylamide such as porphyrin.

As the monofunctional (meth) acrylate monomer, an alkyl (meth) acrylate having a carbon number of 4 to 30 is preferably used, and it is more preferable to use a carbon number of 12 to 22 based on the viewpoint of improving the dispersibility of the quantum dots. Alkyl methacrylate. The higher the dispersibility of the quantum dots, the more the amount of light traveling straight from the wavelength conversion layer to the exit surface is increased, and therefore, the improvement of the front luminance and the front contrast is effective. Specifically, as the monofunctional (meth) acrylate monomer, butyl (meth) acrylate, octyl (meth) acrylate, lauryl (meth) acrylate, or (meth) acrylate oleyl is preferred. Ester, octadecyl (meth) acrylate, behenyl (meth) acrylate, butyl (meth) acrylamide, octyl (meth) acrylamide, lauryl (meth) acrylamide , oil-based (meth) acrylamide, octadecyl (meth) acrylamide, behenyl (meth) acrylamide, and the like. Among them, particularly preferred are lauryl (meth) acrylate, oleyl (meth) acrylate, and octadecyl (meth) acrylate.

It is also possible to use a monomer having one (meth)acrylic acid polymerizable unsaturated bond ((meth)acryl fluorenyl group) in one molecule in combination with two or more (meth) acrylonitrile groups in the molecule. Functional (meth) acrylate monomer. As a specific example, a compound is exemplified below, but the present invention is not limited thereto.

Examples thereof include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, and 1,9-nonanediol di(meth)acrylate. The number of carbon atoms of the alkylene chain such as olefin diol di(meth) acrylate having a carbon number of 1 to 20 in the base chain; polyethylene glycol di(meth) acrylate or polypropylene glycol di(meth) acrylate Polyolefin diol di(meth) acrylate of 1-20; trimethylolpropane tri(meth) acrylate, ethylene oxide addition trimethylolpropane tri(meth) acrylate, etc. Tris(meth)acrylate having a carbon number of 10 to 60; ethylene oxide addition to pentaerythritol tetra(meth)acrylate, di(trimethylolpropane)tetra(meth)acrylate, new A tetrakis(meth)acrylate having a total carbon number of 10 to 100 such as pentaerythritol tetra(meth)acrylate; dipentaerythritol hexa(meth)acrylate.

The amount of the polyfunctional (meth) acrylate monomer to be used is preferably 5 parts by mass or more based on the total strength of the polymerizable compound contained in the quantum dot polymerizable composition, and is preferably 5 parts by mass or more based on the strength of the coating film; The gelation viewpoint of the composition is preferably 95 parts by mass or less. In addition, the amount of the monofunctional (meth) acrylate monomer to be used is preferably 5 parts by mass or more and 95 parts by mass based on 100 parts by mass of the total amount of the polymerizable compound contained in the quantum dot polymerizable composition. Below the mass.

Preferred examples of the polymerizable compound include a cyclic ether group such as an epoxy group or an propylene oxide group which can be subjected to ring-opening polymerization. Base compound. As such a compound, a compound having an epoxy group-containing compound (epoxy compound) is more preferable. For the epoxy compound, reference is made to paragraphs 0029 to 0033 of JP-A-2011-159924.

The above quantum dot polymerizable composition may contain a known radical polymerization initiator or a cationic polymerization initiator as a polymerization initiator. For the polymerization initiator, for example, paragraphs 0037 of JP-A-2013-043382 and paragraphs 0040 to 0942 of JP-A-2011-159924 can be referred to. The polymerization initiator is preferably 0.1 mol% or more, more preferably 0.5 to 5 mol%, based on the total amount of the polymerizable compound contained in the polymerizable composition.

The quantum dots can be added to the above polymerizable composition in a particulate state, and can also be added in a state of being dispersed in a dispersion of a solvent. It is preferable to add in the state of a dispersion liquid based on the viewpoint of suppressing aggregation of a quantum dot particle. The solvent used herein is not particularly limited. The quantum dot may be added in an amount of, for example, about 0.1 to 10 parts by mass based on 100 parts by mass of the total amount of the composition used for formation of the wavelength conversion layer.

The wavelength conversion layer can be applied to, for example, a surface of a barrier member by applying a quantum dot polymerizable composition containing the above-described components and a known additive which can be arbitrarily added, to remove the solvent, and thereafter, by irradiation or the like. It is formed by hardening its polymerization. Examples of the coating method include a curtain coating method, a dip coating method, a spin coating method, a printing coating method, a spray coating method, a slot coating method, a roll coating method, a slide coating method, and a knife coating method. A well-known coating method such as a gravure coating method or a wire bar method. Further, the curing conditions can be appropriately set depending on the type of the polymerizable compound to be used or the composition of the polymerizable composition. Furthermore, in order to match the viscosity of the composition, etc., it may be added as needed. Solvent. The type and amount of the solvent to be used at this time are not particularly limited. For example, as the solvent, one type or a mixture of two or more types of organic solvents may be used.

The total thickness of the wavelength conversion layer is preferably 1 μm or more, more preferably 50 μm or more, and still more preferably 80 μm or more. From the viewpoint of achieving high luminance by obtaining high-intensity light emission from the wavelength conversion layer, it is preferred that the quantum dots as the light-emitting material are more contained in the wavelength conversion layer, and the wavelength conversion layer is thickened. In this regard, as described above, according to the above-described transfer material, it is possible to achieve a reduction in thickness of an article in which the wavelength conversion member is assembled without depending on the thickness reduction of the wavelength conversion layer. On the other hand, the total thickness of the wavelength conversion layer is preferably 500 μm or less, more preferably 400 μm or less. Further, the wavelength conversion layer may have a laminated structure of two or more layers, or may have a wavelength conversion layer containing quantum dots (having different emission center wavelengths) showing two or more different light-emitting characteristics in the same layer. When the wavelength conversion layer has a plurality of layers, the thickness of one layer is preferably in the range of 1 to 300 μm, more preferably in the range of 10 to 250 μm, and even more preferably in the range of 30 to 150 μm.

The hardening of the polymerizable composition containing the quantum dots can be performed in a state in which the polymerizable composition containing the quantum dots is sandwiched between the barrier member A and the barrier member B. Referring to the drawings, an aspect of the manufacturing steps of the transfer material including the hardening treatment will be described below. However, the invention is not limited to the following aspects.

Fig. 1 is a schematic structural view showing an example of a manufacturing apparatus of a wavelength conversion member, and Fig. 2 is a partially enlarged view of the manufacturing apparatus shown in Fig. 1. The manufacturing step of the wavelength conversion member using the manufacturing apparatus shown in Figs. 1 and 2 includes at least a first substrate for continuous conveyance (hereinafter referred to as " a step of forming a coating film by coating a polymerizable composition having a sub-point on the surface of the first film "), and laminating (superposing) a second substrate (hereinafter referred to as "second film") continuously conveyed on the coating film, and a step of sandwiching the coating film between the first film and the second film; and applying the coating film to the first film and the second film, and attaching the first film and the second film to the backing On the roll, a step of continuously irradiating light and polymerizing and curing the coating film to form a wavelength conversion layer (hardened layer) is carried out. By using the barrier members A and B as the first film and the second film, a transfer material having a wavelength conversion member between the barrier member A and the barrier member B can be obtained. As long as either the first film or the second film is the barrier film A and the other is the barrier film B, the barrier films A and B are not limited.

More specifically, first, the first film 10 is continuously conveyed toward the application unit 20 by a feeder (not shown). The first film 10 is sent out at a conveyance speed of, for example, 1 to 50 m/min by a feeder. However, the transport speed is not limited. At the time of delivery, for example, a tension of 20 to 150 N/m is applied to the first film 10, preferably a tension of 30 to 100 N/m.

In the coating unit 20, a polymerizable composition containing quantum dots (hereinafter also referred to as "coating liquid") is applied to the surface of the first film 10 that is continuously conveyed to form a coating film 22 (see FIG. 2). The coating unit 20 is provided with, for example, a die coater 24 and a backing roll 26 disposed to face the die coater 24. The surface opposite to the surface on which the coating film 22 of the first film 10 is formed is wound around the backing roll 26, and the coating liquid is applied to the surface of the first film 10 that is continuously conveyed by the discharge port of the die coater 24, and A coating film 22 is formed. Here, the coating film 22 refers to a polymerizable composition containing quantum dots before curing applied to the first film 10.

In the present embodiment, the die coater 24 to which the extrusion coating method is applied is shown as a coating device, but is not limited thereto. For example, a coating device using various methods such as a curtain coating method, an extrusion coating method, a rod coating method, or a roll coating method can be used.

The first film 10 on which the coating film 22 is formed by the coating portion 20 is continuously conveyed toward the lamination portion 30. In the layered portion 30, the second film 50 that has been continuously conveyed is laminated on the coating film 22, and the coating film 22 is sandwiched between the first film 10 and the second film 50. Further, when the polymerizable composition containing the quantum dots contains a solvent, a drying zone (not shown) may be provided at any position before the lamination portion 30 to remove the solvent. The drying treatment in the drying zone can be carried out by a known method such as heating the environment or blowing dry air.

The lamination portion 30 is provided with a laminating roller 32 and a heating chamber 34 surrounding the laminating roller 32. The heating chamber 34 is provided with an opening 36 for allowing the first film 10 to pass therethrough and an opening 38 for allowing the second film 50 to pass therethrough.

A backing roller 62 is disposed at a position facing the laminating roller 32. The first film 10 on which the coating film 22 is formed is wound on the surface of the coating film 22 opposite to the surface on which the coating film 22 is formed, and is continuously conveyed toward the lamination position P. The lamination position P is a position at which the second film 50 and the coating film 22 come into contact with each other. It is preferable that the first film 10 is wound around the backing roll 62 before reaching the lamination position P. This is because when the first film 10 is wrinkled, the wrinkles can be removed by the backing roll 62 before being brought to the lamination position P. Therefore, the longer the distance L1 between the position (contact position) of the first film 10 and the lamination position P, which is attached to the backing roll 62, is preferably 30 mm or more, and the upper limit is usually set by the backing roller 62. The diameter is determined by the pass line.

In the present embodiment, the second film 50 is laminated by the backing roll 62 used by the curing portion 60 and the laminating roller 32. That is, the backing roll 62 used in the hardened part 60 also serves as the roll used for the laminated part 30. However, the present invention is not limited to the above-described embodiment, and the laminating portion 30 may be provided with a roller for laminating the backing roller 62 instead of the backing roller 62.

By using the backing roller 62 used for the hardening portion 60 in the lamination portion 30, the number of rollers can be reduced. Further, the backing roller 62 can also be used as a heating roller for the first film 10.

The second film 50 fed from a feeder (not shown) is wound around the laminating roller 32, and is continuously conveyed between the laminating roller 32 and the backing roller 62. The second film 50 is laminated on the coating film 22 formed on the first film 10 at the lamination position P. Thereby, the coating film 22 is sandwiched between the first film 10 and the second film 50. The "lamination" refers to a method in which the second film 50 is superposed on the coating film 22 and laminated.

The distance L2 between the laminating roller 32 and the backing roller 62 is preferably equal to or greater than the total thickness of the first film 10, the wavelength conversion layer (hardened layer) 28 obtained by polymerizing and curing the coating film 22, and the second film 50. Further, it is preferable that L2 is equal to or less than the total thickness of the first film 10, the coating film 22, and the second film 50 by 5 mm or less. By making the distance L2 equal to or less than the total thickness of 5 mm, it is possible to prevent air bubbles from entering between the second film 50 and the coating film 22. Here, the distance L2 between the laminating roller 32 and the backing roller 62 means the shortest distance between the outer circumferential surface of the laminating roller 32 and the outer circumferential surface of the backing roller 62.

The rotational precision of the laminating roller 32 and the backing roller 62 is 0.05 mm or less, preferably 0.01 mm or less, in terms of a radial runout. The smaller the radial runout, the smaller the thickness distribution of the coating film 22.

Further, in order to suppress the sandwiching of the first film 10 and the second film 50 The thermal deformation after the coating film 22, the difference between the temperature of the backing roller 62 of the curing portion 60 and the temperature of the first film 10, and the difference between the temperature of the backing roller 62 and the temperature of the second film 50 are preferably 30 ° C or less. More preferably, it is 15 ° C or less, and the best ones are the same.

In order to reduce the difference in temperature from the backing roller 62, it is preferable to heat the first film 10 and the second film 50 in the heating chamber 34 when the heating chamber 34 is provided. For example, the first film 10 and the second film 50 can be heated by supplying hot air to the heating chamber 34 by a hot air generating device (not shown).

The first film 10 may be heated by the backing roll 62 by being attached to the temperature-adjusted backing roll 62.

On the other hand, in the second film 50, the laminating roller 32 can be used as the heating roller, and the second film 50 can be heated by the laminating roller 32.

However, the heating chamber 34 and the heating roller are not necessary, and may be provided as needed.

Then, the coating film 22 is sandwiched between the first film 10 and the second film 50, and is continuously conveyed toward the curing portion 60. According to the embodiment, the hardening in the hardened portion 60 is performed by illuminating, but if the polymerizable compound contained in the polymerizable composition containing the quantum dots is polymerized by heating, Heating by warm air blowing or the like is performed.

An illumination device 64 is provided at a position facing the backing roller 62 and the backing roller 62. The first film 10 and the second film 50 sandwiching the coating film 22 are continuously conveyed between the backing roller 62 and the illuminating device 64. The light to be irradiated by the illumination device may be determined according to the type of the photopolymerizable compound contained in the polymerizable composition containing the quantum dots, and examples thereof include ultraviolet rays. Here, ultraviolet light means light having a wavelength of 280 to 400 nm. As the light source for generating ultraviolet rays, for example, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used. The amount of illumination may be set to a range in which polymerization curing of the coating film is possible. For example, as an example, the coating film may be irradiated with ultraviolet rays having an irradiation amount of 100 to 10000 mJ/cm ² .

In the hardened portion 60, the first film 10 is wound around the backing roll 62 while the first film 10 and the second film 50 are sandwiched by the coating film 22, and is irradiated by the illumination device 64 while being continuously conveyed. The coating film 22 is cured to form a wavelength conversion layer (hardened layer) 28.

In the present embodiment, the first film 10 side is wound around the backing roll 62 and continuously conveyed. However, the second film 50 may be wound around the backing roll 62 and continuously conveyed.

The term "rolling to the backing roll 62" means a state in which either of the first film 10 and the second film 50 is brought into contact with the surface of the backing roll 62 at a certain wrap angle. Therefore, during the continuous conveyance, the first film 10 and the second film 50 move in synchronization with the rotation of the backing roller 62. The attachment to the backing roller 62 may be performed at least during the period in which the ultraviolet rays are irradiated.

The back roller 62 includes a main body having a cylindrical shape and a rotating shaft disposed at both end portions of the main body. The present system of the backing roller 62 has, for example 200 to 1000 mm in diameter. As for the diameter of the backing roller 62 Not limited. Consider the crimping of laminated film, equipment cost, and rotational precision, diameter It is preferably 300 to 500 mm. The temperature of the backing roller 62 can be adjusted by attaching a temperature regulator to the body of the backing roller 62.

The temperature of the backing roller 62 can consider the heat release and coating film when the light is illuminated. The curing efficiency of 22 and the occurrence of wrinkle deformation of the first film 10 and the second film 50 on the backing roll 62 are determined. The backing roller 62 is preferably set in a temperature range of, for example, 10 to 95 ° C, more preferably 15 to 85 ° C. Here, the relevant temperature of the roller refers to the surface temperature of the roller.

The distance L3 between the lamination position P and the illumination device 64 may be, for example, 30 mm or more.

The coating film 22 is converted into the hardened layer 28 by irradiation to form the wavelength conversion member 70 including the first film 10, the cured layer 28, and the second film 50. The wavelength conversion member 70 is peeled off from the backing roller 62 by the peeling roller 80. The wavelength conversion member 70 is continuously conveyed to a winder (not shown), and secondly, the wavelength conversion member 70 is wound into a roll shape by a winder.

In the above, an aspect of the manufacturing steps of the transfer material has been described, but the present invention is not limited to the above. For example, by applying a polymerizable composition containing quantum dots to one of the barrier members A and B, the other barrier member is not laminated thereon, and hardening is performed after the drying treatment as required. A wavelength conversion member (wavelength conversion layer) is formed. For the formed wavelength conversion layer, one or more layers other than the inorganic layer or the like may be laminated by a known method.

(for easy peeling)

The wavelength conversion member has a barrier member B on one side and a temporary support (barrier member A) on the other surface. Since the temporary support can be peeled off by transferring (adhering) the transfer material to the transfer target, the interface between the temporary support and the wavelength conversion member is preferably easily peeled off. In the present invention and the present specification, the term "easily peelable" means that the temporary support is torn in a direction perpendicular to the surface of the wavelength conversion member. The magnitude of the force at the time of the body is 0.2 N/10 mm or less in accordance with the 90° peeling adhesion force described in JIS Z 0237. Therefore, in one aspect, the outermost layer of the wavelength conversion member side of the temporary support (barrier member A) can be regarded as a layer other than the easy-adhesion layer described later. As such a layer, an inorganic layer which will be described later is mentioned in one aspect. The inorganic layer generally has a wavelength conversion member (wherein a wavelength conversion layer containing quantum dots in an organic matrix, and particularly a hardened layer obtained by hardening a (meth)acrylate-based polymerizable composition containing quantum dots) The wavelength conversion layer has a tendency to have low adhesion. Therefore, by forming the outermost layer of the wavelength conversion member side of the temporary support (barrier member A) as an inorganic layer, the interface between the temporary support (barrier member A) and the wavelength conversion member can be easily peeled off. Further, in another aspect, the outermost surface of the temporary support (barrier member A) side of the wavelength conversion member can be made into an easily peelable surface. Furthermore, in still another aspect, the outermost surface of the wavelength conversion member side of the temporary support (barrier member A) can be made into an easily peelable surface.

The easily peelable surface refers to a surface on which the treatment for facilitating the peeling is performed. A preferred method for forming the easily peelable surface is a method in which particles are biased in the surface layer region of the wavelength conversion member or the temporary support.

To this end, in one aspect, the side support layer of the temporary support body (barrier member A) of the wavelength conversion member, or the side surface layer of the wavelength conversion member of the temporary support body (barrier member A), or the two surface layers are provided Particle layer. The particle-containing layer system exhibits a function as an easily peelable surface by transmitting particles on the surface of the layer to change the surface characteristics.

Further, in another aspect, for example, when the wavelength conversion layer is formed, by using two or more kinds of coating liquids having different particle contents, the particles are biased toward the thickness direction of the layer by gravity, and only one-sided particles can be formed. Areas with different contents. For example, after the first region is formed using the particle-free coating liquid, a coating liquid containing particles is applied to the region to form a second region, whereby a wavelength conversion layer having a particle-biased region (second region) can be formed. By providing such a particle biased existence region, the surface of the wavelength conversion member can function as an easily peelable surface.

The particle deflection existence region can be identified by observing the cross section of the wavelength conversion member with an electron microscope and counting the number of particles in the thickness direction. Alternatively, the surface of the wavelength conversion member is etched with carbon, and the wavelength conversion member is measured by SEM-EDX (Scanning Electron Microscope-Energy Dispersive X-ray Spectrometer; JSM670 type manufactured by JEOL Co., Ltd.) The intensity of the element in the thickness direction (depth direction) can be used to identify the particle biased existence region in the wavelength conversion member.

Specifically, as an index of the tendency of the particles in the wavelength conversion member (an index of the particle bias existence), a value obtained by the following method can be employed.

(index of particle biased existence)

The cross section of the wavelength conversion member that has been cut by the SEM-EDX (for example, JSM670 model manufactured by JEOL Co., Ltd.) is observed, for example, the cross section cut out by Microtome, and the number of particles on the cross section of the observation target is measured. The direction perpendicular to the excitation light incident side surface and the exit side surface of the wavelength conversion member is the x-axis. It is assumed that the thickness of the wavelength conversion member along the x-axis is L, x=0 is defined as the temporary support side surface, and x=L is defined as the side surface of the barrier member B. Set the normalized number density distribution of the particles on the cutting profile to (x).

that is,

Established.

As an index indicating the existence of the deflection of the particles in the wavelength conversion member, Φ is defined as the following formula:

When Φ = 1, in the wavelength converting member, the entire particles are present on the side surface of the barrier member B; when Φ = 0, they are present on the side surface of the temporary support. On the other hand, when the particles are uniformly distributed in the wavelength converting member, Φ = 0.5. Therefore, when there is a particle deflection existence region in the surface layer region of the temporary support side of the wavelength conversion member, the Φ system is larger than 0 and smaller than 0.5.

Similarly, the presence of particles in the temporary support can be identified.

Further, the wavelength conversion layer containing the quantum dots can increase the light emission intensity and increase the luminance by increasing the extraction efficiency of light emitted inside the layer. However, the light emitted by the wavelength conversion layer is totally reflected at an angle incident toward the interface of the adjacent layer having different refractive indices, and is guided to the inside of the wavelength conversion layer, resulting in a decrease in light extraction efficiency. Therefore, the light scattering structure is provided to enhance the light extraction efficiency, and it is effective to further improve the luminous efficiency of the wavelength conversion member. As such a light scattering structure, a particle-containing layer or a particle-biased existence region is effective.

From the viewpoint of improving the extraction efficiency, it is preferred to use particles having a primary particle diameter (primary particle diameter) of 100 nm or more, more preferably a primary particle diameter of 500 nm or more, and preferably a primary particle having a particle diameter of 1 μm or more. Further, the primary particle diameter of the particles is preferably 10 μm or less, more preferably 8 μm or less, still more preferably 5 μm or less.

The particle diameter in the present invention and the present specification means a value obtained by observation using a scanning electron microscope (SEM). Specifically, the cross section of the wavelength conversion layer or the barrier member was photographed at a magnification of 5000 times, and the particle diameter was measured from the obtained image. Further, for the particles which are not spherical, the average value of the length of the major axis and the length of the minor axis is obtained, and this is used as the particle diameter. The diameters described later are also the same.

The particles are preferably present as primary particles in the wavelength conversion member or the barrier member, but may be present as higher-order particles having secondary particles or more. The particles having the higher order particles (aggregated particles) of the secondary particles or more, wherein the particle diameter of the aggregated particles is preferably within the above range. Further, in the present invention and the present specification, the particle diameter of the particles present in the wavelength conversion member or the barrier member refers to a state existing in the member (for example, if the primary particle system is a primary particle diameter or if it is a secondary particle) Is the secondary particle size). In addition, the particle diameter of the Example described later was observed by a scanning electron microscope (JSM670 model manufactured by JEOL Co., Ltd.) and the cross-section of the wavelength conversion member or the barrier member was measured.

The particles which are preferable from the viewpoint of enhancing the light extraction efficiency (hereinafter referred to as "light scattering particles") are the difference in refractive index from the matrix constituting the layer (particle layer or wavelength conversion layer) containing particles (absolute value to be described later | Nb-ns |) is 0.02 or more. Light scattering particles can use only one type of particle Further, a plurality of particles may be used in combination. The light scattering particles may be inorganic particles or organic particles. For details, reference is made to paragraph 0022 of JP-A-2010-198735. Further, as for the various components constituting the matrix containing the particle layer and the method for producing the particle-containing layer, reference is made to paragraphs 0023 to 0028 and paragraphs 0033 to 0035 of the same publication. The thickness of the particle-containing layer is not particularly limited, and is, for example, about 0.5 μm to 50 μm in terms of dry thickness, but may be appropriately selected depending on the purpose. From the viewpoint of oxygen barrier property and light transmittance, it is preferably in the range of 1 μm to 20 μm, more preferably in the range of 2 μm to 10 μm, still more preferably in the range of 3 μm to 7 μm.

On the other hand, when the wavelength conversion layer contains light-scattering particles, the mass density of the amount of light-scattering particles in the wavelength conversion layer is preferably 2% or more from the viewpoint of enhancing light extraction efficiency. On the other hand, based on the brittleness viewpoint, the mass density of the light-scattering particles in the wavelength conversion layer is preferably less than 30%.

The absolute value | nb-ns | of the difference between the refractive index ns of the light-scattering particles and the refractive index nb of the matrix material is preferably 0.02 or more, more preferably 0.03 or more, still more preferably 0.10 or more, from the viewpoint of enhancing the light extraction efficiency. Further, the refractive index in the present invention means the refractive index ne of the e-line (546.1 nm) of the Fraunhofer. Further, when two or more kinds of light-scattering particles are contained in the particle-containing layer or the wavelength conversion layer, it is preferred that at least one of the light-scattering particles has a refractive index satisfying the above absolute value, and more preferably two or more kinds of light-scattering particles. It is preferable to have a refractive index satisfying the above absolute value, and it is preferable that all of the light-scattering particles have a refractive index satisfying the above absolute value. The refractive index ns of the light scattering particles may be greater than or less than the refractive index nb of the matrix material.

The larger value of nb-ns | is better than the scattering efficiency. On the other hand, the refractive index of the light-scattering particles and the matrix is a value inherent to the material, and can be known by a spectral identification material such as microscopic IR (microscopic infrared spectroscopy).

Further, the refractive index of the matrix can be measured using an Abbe refractometer. The refractive index of the matrix can be adjusted by adding fine particles having a refractive index different from the matrix and having a diameter of less than about 10 nm. The particles having a diameter of about 10 nm used here are extremely small, and are so small that they hardly scatter visible light.

The smaller the refractive index of the matrix, the better, based on the viewpoint of improving light extraction efficiency. In general, when the light emission inside the resin having a refractive index of more than 1 is taken out to the air layer, light incident at a critical angle or more is totally reflected at the interface with the air, resulting in a decrease in extraction efficiency. The critical angle is determined by the Snell's law. The lower the refractive index of the matrix, the larger the critical angle, and the higher the extraction efficiency. This tendency is established even when a high refractive index medium such as an inorganic barrier member exists on the exit side surface of the substrate.

From the viewpoint of improving the extraction efficiency, it is preferable to reduce back scattering and forward scattering. Therefore, the diameter rs of the light-scattering particles is preferably 0.5 μm or more from the viewpoint of reducing the influence of the backscattering, and is preferably 10 μm or less from the viewpoint of reducing the influence of the forward scattering. That is, it is preferably in the range of 0.5 μm ≦ rs ≦ 10 μm. The diameter of the light-scattering particles is more preferably 0.8 μm ≦ rs ≦ 8 μm, still more preferably 1 μm ≦ rs ≦ 5 μm.

It is preferable that the surface layer region of the temporary support (barrier member A) side of the wavelength conversion member, preferably the emission side surface layer region, contains at least one of light scattering particles having at least one of a refractive index and a diameter. By containing two or more such light-scattering particles, scattering of scattered light can be suppressed A good white balance can be obtained by the coloring caused by the angle dependence. The ratio of the number of light scattering particles (number of particles) is preferably 1:9 to 9:1, and preferably 2:8 to 8:2.

The light-scattering particles contained in the surface layer region of the wavelength conversion member, preferably in the emission-side surface region, are arranged so as to be arranged on the surface of the layer, and the light extraction efficiency-improving effect can be exhibited. The reason for this is that total reflection can be prevented by disturbing the interface with an adjacent layer by the light scattering particles thus arranged. At this time, even when the refractive index of the substrate and the light-scattering particles are equal, a good extraction efficiency improvement effect can be seen.

(barrier members A, B)

The barrier members A and B of the transfer material of one aspect of the present invention may each comprise one or more layers selected from the inorganic layer and the organic layer. Also, the barrier member may also comprise a substrate. The details are described later.

Further, in the present invention and the present specification, the "inorganic layer" means a layer mainly composed of an inorganic material. The main component refers to the most abundant component among the components contained in the layer. In the case of a layer containing two or more different inorganic materials, the above content means the total content of a plurality of different inorganic materials. As described above, the main components related to the organic layer described later are also the same. The inorganic layer is preferably a layer formed only of an inorganic material. On the other hand, the organic layer is a layer mainly composed of an organic material, and is preferably a layer having an organic material content of 50% by mass or more, even 80% by mass or more, and particularly preferably 90% by mass or more.

-Inorganic layer -

The inorganic material constituting the inorganic layer is not particularly limited, and for example, each of a metal, an inorganic oxide, a nitride, an oxynitride, or the like can be used. An inorganic compound. The element constituting the inorganic material is preferably ruthenium, aluminum, magnesium, titanium, tin, indium or antimony, and these may contain one type or two or more types. Specific examples of the inorganic compound include cerium oxide, cerium oxide lanthanum oxide, aluminum oxide, magnesium oxide, titanium oxide, tin oxide, indium oxide alloy, tantalum nitride, aluminum nitride, and titanium nitride. Further, as the inorganic layer, a metal film such as an aluminum film, a silver film, a tin film, a chromium film, a nickel film, or a titanium film may be provided.

Among the above materials, from the viewpoint of forming a barrier member having high barrier properties, cerium nitride, cerium oxide, or cerium oxynitride is particularly preferable. Further, in one aspect, in order to form a state in which the interface between the temporary support (barrier member A) and the wavelength converting member can be easily peeled off, it is preferable to include cerium nitride, cerium oxide, and cerium oxide nitride. The inorganic layer of the inorganic material selected in the group is provided as the outermost layer of the wavelength conversion member side of the temporary support (barrier member A); more preferably, the temporary support (barrier layer A) is used as the organic matrix Provided by a layer adjacent to the wavelength conversion layer containing the quantum dots; further preferably provided as a layer adjacent to the wavelength conversion layer, wherein the wavelength conversion layer polymerizes the (meth) acrylate containing quantum dots A hardened layer formed by the hardening of a composition. Further, in the present invention and the present specification, "adjacent" means that they are directly in contact without being interposed between other layers.

The method for forming the inorganic layer is not particularly limited, and it can be formed by a known film forming method. From the viewpoint of achieving better barrier properties, it is preferred to form an inorganic layer by depositing inorganic materials by evaporation. Here, the vapor deposition in the present invention refers to various film forming methods in which the film forming material is evaporated or scattered to deposit the vapor deposited surface, and more specifically, the vapor deposition method is included. Physical vapor deposition (PVD) such as sputtering or ion plating, and various chemical vapor deposition (CVD) methods.

Specific examples of the vapor deposition method include a vacuum deposition method in which an inorganic material such as an inorganic oxide, an inorganic nitride, an inorganic oxynitride, or a metal is vapor-deposited on a substrate, and an inorganic material is used as a raw material. An oxidation reaction vapor deposition method in which an oxygen is introduced by vaporization on a substrate by introducing oxygen, and an inorganic material is used as a target material, and argon gas and oxygen gas are introduced for sputtering, and evaporation is performed on the substrate. a method of physical vapor deposition (Physical Vapor Deposition) of an ion plating method in which an inorganic material is heated by a plasma beam generated by a plasma gun, and is vapor-deposited on a substrate; In the case of coating, a chemical vapor deposition method (Chemical Vapor Deposition method) using an organic cerium compound as a raw material may be mentioned.

Further, the ruthenium oxide film can also be formed by using a low-temperature plasma chemical vapor deposition method using an organic ruthenium compound as a raw material. Specific examples of the organic ruthenium compound include 1,1,3,3-tetramethyldioxanane, hexamethyldioxane, vinyltrimethylnonane, and hexamethyldioxane. Methyl decane, dimethyl decane, trimethyl decane, diethyl decane, propyl decane, phenyl decane, vinyl triethoxy decane, tetramethoxy decane, phenyl triethoxy decane, Triethoxy decane, octamethylcyclotetraoxane, and the like. Further, among the above organic ruthenium compounds, tetramethoxy decane (TMOS) and hexamethyldioxane (HMDSO) are preferably used. Therefore, the handling properties of the system and the characteristics of the deposited film are excellent.

The thickness of the inorganic layer is preferably from 10 nm to 500 nm, preferably from 10 nm to 300 nm, particularly preferably from 10 nm to 150 nm. Since the thickness of the inorganic layer is within the above range, good barrier properties can be achieved, and reflection in the inorganic layer can be suppressed, and high light transmittance can be achieved.

Further, the inorganic layer may be adjacent to the wavelength conversion layer included in the wavelength conversion member, or another layer of one or more layers may be present between the inorganic layer and the wavelength conversion layer. In the latter case, since the inorganic layer is generally excellent in barrier properties, the distance between the wavelength conversion member side surface of the inorganic layer and the side surface of the barrier member of the wavelength conversion layer included in the wavelength conversion member is preferably less than 10 μm, more preferably Less than 5 μm. Further preferably, the inorganic layer is adjacent to the wavelength conversion layer.

- organic layer -

As the organic layer, reference is made to paragraphs 0020 to 0942 of JP-A-2007-290369, and paragraphs 0074 to 0105 of JP-A-2005-096108. Further, in terms of the organic layer, in one aspect, a cardo polymer is preferably contained. The reason for this is that the adhesion to the layer or the substrate adjacent to the organic layer (details are described later), especially the adhesion to the inorganic layer, is better, and the gas barrier property can be further improved. . For details of the ruthenium polymer, reference is made to paragraphs 0085 to 0095 of the above-mentioned JP-A-2005-096108. The thickness of the organic layer is preferably in the range of 0.05 μm to 10 μm, and preferably in the range of 0.5 to 10 μm. When the organic layer is formed by a wet coating method, the thickness of the organic layer is preferably in the range of 0.5 to 10 μm, and preferably in the range of 1 μm to 5 μm. Further, when it is formed by a dry coating method, it is preferably in the range of 0.05 μm to 5 μm, and more preferably in the range of 0.05 μm to 1 μm. The reason for this is that the organic layer formed by the wet coating method or the dry coating method When the thickness is in the above range, the adhesion to the inorganic layer can be made better.

Further, in the present invention and the present specification, the polymer means a polymer obtained by polymerizing two or more compounds which are the same or different, and is polymerized in the sense of containing an oligomer, and the molecular weight thereof is not particularly limited. Further, the polymer is a polymer having a polymerizable group, and may be further polymerized by a polymerization treatment of a type corresponding to a polymerizable group such as heating or illuminating.

Further, the organic layer may be a hardened layer obtained by curing a polymerizable composition containing a (meth) acrylate polymer. The (meth) acrylate polymer refers to a polymer containing one or more (meth) acrylonitrile groups in one molecule. An example of the (meth) acrylate polymer used for the formation of the organic layer is a (meth) acrylate polymer containing one or more urethane bonds in one molecule. Hereinafter, a (meth) acrylate polymer containing one or more urethane bonds in one molecule is referred to as a "methionate polymer containing a urethane bond". When the barrier members A and B include two or more organic layers, the hardened layer obtained by curing a polymerizable composition containing a (meth) acrylate polymer containing a urethane bond, and Other organic layers. In one aspect, the outermost layer on the wavelength conversion member side of the barrier member B is preferably a hardened layer obtained by curing a polymerizable composition containing a (meth) acrylate polymer containing a urethane bond. This is because the hardened layer is a wavelength converting member (preferably, a wavelength converting layer containing quantum dots in an organic matrix, and more preferably a (meth)acrylate based polymerizable composition containing quantum dots is hardened. The wavelength conversion layer of the hardened layer) shows good adhesion.

In the (meth) acrylate polymer containing a urethane bond, in one aspect, it is preferred to introduce a structural unit having a urethane bond to the side chain of the polymer. Hereinafter, the main chain into which the structural unit having a urethane bond is introduced is referred to as an "acrylic backbone".

Further, it is also preferred that at least one of the ends of the side chain having a urethane bond contains a (meth)acryl fluorenyl group. More preferably, all of the side chains having a urethane bond contain a (meth) acrylonitrile group. Here, the (meth)acrylonitrile group contained in the terminal is more preferably an acrylonitrile group.

The (meth) acrylate polymer containing a urethane bond can be generally obtained by graft copolymerization, but is not particularly limited. The acrylic acid backbone and the structural unit having a urethane bond may be directly bonded or may be bonded via a linking group. Examples of the linking group include an oxirane group, a polyethylene oxide group, an oxypropylene group, and a polypropylene oxide group. The (meth) acrylate polymer containing a urethane bond may also comprise a side chain in which a plurality of structural units having a urethane bond are bonded via different linking groups (including direct bonding).

The (meth) acrylate polymer containing a urethane bond may also contain other side chains other than the structural unit having a urethane bond. As an example of another side chain, a linear or branched alkyl group is mentioned. The linear or branched alkyl group is preferably a linear alkyl group having 1 to 6 carbon atoms, more preferably n-propyl group, ethyl group or methyl group, and more preferably a methyl group. Further, other side chains may also contain different structures. In this way, the structural unit having a urethane bond is also the same.

The number of urethane bonds and (meth) acrylonitrile groups contained in one molecule of a (meth) acrylate polymer containing a urethane bond Each is one or more, preferably two or more, but is not particularly limited. The weight average molecular weight of the (meth) acrylate polymer containing a urethane bond is preferably 10,000 or more, more preferably 12,000 or more, still more preferably 15,000 or more. Further, the weight average molecular weight of the (meth) acrylate polymer containing a urethane bond is preferably 1,000,000 or less, more preferably 500,000 or less, still more preferably 300,000 or less. The methacrylate polymer having a urethane bond has a propylene oxime equivalent of preferably 500 or more, more preferably 600 or more, still more preferably 700 or more; and the propylene oxime equivalent is preferably 5,000 or less. More preferably, it is 3,000 or less, and still more preferably 2,000 or less. The propylene fluorenyl equivalent is a value obtained by dividing the number of (meth) acrylonitrile groups in one molecule by the weight average molecular weight.

The weight average molecular weight in the present invention and the present specification is a value obtained by converting the measured value obtained by gel permeation chromatography (GPC) in terms of polystyrene. Examples of the specific measurement conditions of the weight average molecular weight include the following measurement conditions: GPC apparatus: HLC-8120 (manufactured by TOSOH Co., Ltd.): Column: TSK gel Multipore HXL-M (7.8 mm ID (inner diameter) manufactured by TOSOH Co., Ltd.) ×30.0cm)

Eluent: tetrahydrofuran (THF)

As the (meth) acrylate polymer containing a urethane bond, those synthesized by a known method can be used, and a commercially available product can also be used. As a commercial item, UV (Ultra violet) hardening type urethane urethane polymer (8BR series) manufactured by TAISEI FINE CHEMICAL CO., LTD. is mentioned, for example. (meth) acrylate containing a urethane bond The polymer is preferably contained in an amount of from 5 to 90% by mass, more preferably from 10 to 80% by mass, based on 100% by mass of the total of the solid content of the polymerizable composition for forming the organic layer.

In the curable compound for forming the organic layer, one or more kinds of (meth) acrylate polymers containing a urethane bond and one or more other polymerizable compounds may be used in combination. As the other polymerizable compound, a compound having an ethylenically unsaturated bond at the terminal or side chain is preferred. Examples of the compound having an ethylenically unsaturated bond at the terminal or side chain include a (meth) acrylate compound, a acrylamide compound, a styrene compound, maleic anhydride, etc., preferably (meth). The acrylate compound is more preferably an acrylate compound.

The (meth) acrylate compound is preferably a (meth) acrylate, a polyester (meth) acrylate, an epoxy (meth) acrylate or the like. Specific examples of the (meth) acrylate compound include the compounds described in paragraphs 0024 to 0036 of JP-A-2013-43382 or paragraphs 0036 to 0048 of JP-A-2013-43384.

The styrene-based compound is preferably styrene, α-methylstyrene, 4-methylstyrene, divinylbenzene, 4-hydroxystyrene or 4-carboxystyrene.

The polymerizable composition for forming the organic layer may also contain a known additive together with one or more polymerizable compounds. As an example of such an additive, a well-known organic metal coupling agent is mentioned. In the organic metal coupling agent, the total amount of the solid content of the polymerizable composition for forming the organic layer is 100% by mass, preferably 0.1 to 30% by mass, and more preferably 1 to 20% by mass.

Further, as the additive, a polymerization initiator is exemplified. When the polymerization initiator is used, the content of the polymerization initiator in the polymerizable composition is preferably 0.1 mol% or more, more preferably 0.5 to 5 mol%, based on the total amount of the polymerizable compound. Examples of the photopolymerization initiator include Irgacure series (for example, Irgacure 651, Irgacure 754, Irgacure 184, Irgacure 2959, Irgacure 907, Irgacure 369, Irgacure 379, Irgacure 819, etc.) sold by BASF Corporation, and Darocure series ( For example, Darocure TPO, Darocure 1173, etc., Quantacure PDO, Ezacure series sold by Lamberti Co., Ltd. (for example, Ezacure TZM, Ezacure TZT, Ezacure KTO46, etc.).

The curing of the polymerizable composition for forming the organic layer may be carried out by treatment (illumination, heating, or the like) of the type of the component (polymerizable compound or polymerization initiator) contained in the polymerizable composition. The curing conditions are not particularly limited, and may be set in accordance with the type of the component contained in the polymerizable composition or the thickness of the organic layer.

From the viewpoint of improving barrier properties, the more the number of layers of the layer contained in the barrier member is increased, the more the number of layers is increased, and the lower the light transmittance is. Therefore, it is preferable that the number of layers of the barrier member B incorporated in the transfer product is increased within a range in which a good light transmittance can be maintained. The total light transmittance of the barrier member B in the visible light region is preferably 80% or more. Further, the oxygen permeability of the barrier members A and B is preferably 1 cm ³ /(m ² .day.atm) or less. Here, the oxygen permeability is measured by an oxygen permeability measuring device (manufactured by MOCON Corporation; OX-TRAN 2/20: trade name) under the conditions of a measurement temperature of 23 ° C and a relative humidity of 90%. value. Further, the visible light region refers to a wavelength region of 380 to 780 nm; and the total light transmittance indicates an average value of light transmittances covering the visible light region.

The oxygen permeability of the barrier members A and B is more preferably 0.1 cm ³ /(m ² .day.atm) or less, and further preferably 0.01 cm ³ /(m ² .day.atm) or less. The total light transmittance in the visible light region is more preferably 90% or more. The lower the oxygen permeability, the better; the higher the total light transmittance in the visible light region, the better.

On the other hand, the water vapor permeability of the barrier members A and B is preferably 0.5 g/(m ² .day) or less, and preferably 0.1 g/(m ² .day) or less, particularly 0.05 g/( m ² .day) The following is better. According to the barrier member having a low water vapor transmission rate, it is possible to prevent the deterioration of the quantum dots due to moisture such as water vapor. The water vapor transmission rate is a value measured by a water vapor permeability measuring apparatus (manufactured by MOCON Corporation; PERMATRAN-W 3/31: trade name) under the conditions of a measurement temperature of 37.8 ° C and a relative humidity of 100%.

For the details of the inorganic layer and the organic layer having the barrier property, the above-mentioned Japanese Patent Publication No. 2007-290369, JP-A-2005-096108, or even US 2012/0113672 A1 can be referred to.

Further, in order to increase the strength, ease of film formation, etc., between the organic layer and the inorganic layer, between the two organic layers, or between the two inorganic layers, or as a support for forming the barrier member, A substrate (substrate film) may be present. As the substrate, a transparent substrate which is transparent to visible light is preferred. The term "transparent to visible light" as used herein means that the light transmittance in the visible light region is 80% or more, preferably 85% or more. The light transmittance used as a measure of transparency can be measured according to the method described in JIS-K7105, that is, the total light transmittance and the amount of scattered light are measured by an integrating sphere type light transmittance measuring device, and then the total light transmittance is reduced. De-diffusion penetration rate is calculated. For the substrate, refer to paragraphs of JP-A-2007-290369. 0046~0052, paragraphs 0040~0055 of JP-A-2005-096108. The thickness of the substrate is preferably in the range of 10 μm to 500 μm from the viewpoints of gas barrier properties and impact resistance, and more preferably in the range of 10 to 400 μm, particularly preferably in the range of 10 to 300 μm.

It is also possible to bond between the organic layer and the inorganic layer, between the two organic layers, or between the two inorganic layers by a known adhesive layer. From the viewpoint of improving the light transmittance of the liquid crystal display device, it is preferable that the barrier layer B which is contained in the transfer member after the transfer is less.

(easy to layer)

It is preferable that the barrier member B protects the quantum dots in the wavelength conversion layer by exhibiting barrier properties without being removed by transfer and incorporated into the transfer product. From this point of view, it is preferable to improve the adhesion between the barrier member B and the wavelength converting member. On the other hand, in view of the ease of peeling of the barrier member A and the wavelength converting member, in one aspect, it is preferred that there is no easy adhesion layer between the barrier member A and the wavelength converting member. Further, in another aspect, from the viewpoint of preventing deterioration of the quantum dots, it is preferable that the barrier member A is excellent in adhesion to the wavelength conversion member before being removed at the time of transfer. Therefore, an easy adhesion layer may exist between the barrier member A and the wavelength converting member.

The easy adhesion layer is not particularly limited, and a well-known person can be used. From the viewpoint of improving adhesion, it is preferred to include at least one of an easy-to-adhere layer selected from a polyester resin, an acrylic resin, and a urethane resin, and more preferably a polyester resin, an acrylic resin, and an amine group. Two or more selected from the ester resin.

For details of the polyester resin, reference is made to paragraph 0044 of JP-A-2013-230697. The polyester resin is preferably an aliphatic polymer The ester is more preferably an alicyclic polyester. The alicyclic polyester is composed of an alicyclic dicarboxylic acid as a main dicarboxylic acid component and an alicyclic diol as a main diol component. For details of the alicyclic polyester, reference is made to paragraphs 0014 to 0025 of JP-A-2009-209285.

For details of the acrylic resin, reference is made to paragraphs 0062 to 0063 of JP-A-2013-230697. For details of the urethane resin, reference is made to paragraphs 0064 to 0073 of JP-A-2013-230697.

The total content of the polyester resin, the acrylic resin, and the urethane resin in the easy-adhesion layer is usually 10% by mass or more, preferably 30 to 95% by mass, based on the viewpoint of obtaining more excellent adhesion. More preferably, it is in the range of 40 to 95% by mass. Moreover, in the easy-adhesion layer, in order to improve the state of the coated surface and the transparency, a well-known component and an additive such as a binder polymer, a crosslinking agent, or a particle other than the above resin component may be used in combination. Specific examples of the binder polymer include polyolefin diol, polyolefin imine, methyl cellulose, hydroxy cellulose, and starch. For the crosslinking agent, reference is made to paragraphs 0052 to 0056 of JP-A-2013-230697. These crosslinking agents may be used singly or in combination of plural kinds.

Further, in the easy-adhesion layer, particles may be contained for the purpose of improving the adhesion and smoothness of the easy-adhesion layer. Examples of the particles include inorganic particles such as cerium oxide, aluminum oxide, and oxidized metal, and organic particles such as crosslinked polymer particles.

The thickness of the easy-adhesion layer is not particularly limited, and is usually 0.002 to 1.0 μm, more preferably 0.02 to 0.5 μm, and still more preferably 0.03 to 0.2 μm, from the viewpoints of adhesion and transparency. Easy adhesion layer can be based on, for example A well-known coating method is formed. For the coating method, for example, paragraphs 0083 to 0088 of JP-A-2013-230697 can be referred to.

(adhesive layer)

In one aspect, the temporary support (barrier member A) may have an adhesive layer on the surface to which the wavelength conversion member is bonded. The adhesive layer has a function of removing the temporary support and removing the temporary support, and at least a part of the adhesive layer remains on the wavelength conversion member to bond the transfer material and the transfer target from which the temporary support is removed. However, the temporary support may also be free of an adhesive layer. At this time, after the temporary support is peeled off from the transfer material, an adhesive layer (coating adhesive) is formed on the surface exposed by the peeling, and the adhesive is bonded to the transfer target by the adhesive.

The adhesive layer can be formed using a well-known adhesive. For example, a self-adhesive layer containing an ethylene-vinyl acetate copolymer or the like, or a pressure-sensitive adhesive layer containing a polymer based on an acrylic resin, a styrene resin, a enamel resin or the like may be used, and is added thereto. A composition obtained by crosslinking a crosslinking agent such as an isocyanate compound, an epoxy compound or an aziridine compound. Further, fine particles may be blended in the adhesive to form an adhesive layer exhibiting light scattering properties.

The thickness of the adhesive layer is preferably from about 1 to 40 μm, based on the adhesiveness and the viewpoint of preventing the bleeding of the applied adhesive. The thinner the coating, the better the thickness, and the better. ~25μm. If the thickness is 3 to 25 μm, it has particularly good workability. The method of forming the adhesive layer is not particularly limited, and a solution containing each component including the above-mentioned base polymer may be applied to the surface to be coated, and then dried to form an adhesive layer, or an adhesive layer may be formed on the separator, and then adhered thereto. Be The surface is coated and laminated. The coated surface to which the adhesive is applied may be subjected to a close treatment such as corona treatment or the like as needed.

Temporary support

As described above, the temporary support system refers to a support that is peeled off before the transfer material is transferred to the transfer object. The temporary support system in the above transfer material includes one or more barrier layers, and is a barrier member (barrier member A) which can optionally include a substrate, an easy-adhesion layer, an adhesive layer, and the like. The details of the various layers and substrates that can form the barrier member are as previously described.

Transfer material manufacturing method

The transfer material can be formed by laminating the layers and the substrate described above. The lamination method and order are not particularly limited. As an example, a laminate including a temporary support (barrier member A) and a barrier member B may be separately formed, a wavelength conversion member may be formed on the surface of any of the barrier members, and the formed wavelength conversion member may be bonded to the other. A transfer material containing the temporary support (barrier member A), the wavelength conversion member, and the barrier member B in this order is obtained. The bonding can be carried out using a known adhesive or an adhesive. Alternatively, the bonding may be carried out by lamination using an adhesive and lamination (hot pressing) without using an adhesive.

Further, as another example, when the wavelength conversion layer is hardened by heat or light, one of the surfaces may be sandwiched by the laminate including the temporary support (barrier member A), and the laminate including the barrier member B may be sandwiched. Hardening on the other side. The transfer material can also be obtained by controlling the adhesion of both sides of the wavelength conversion member to make an asymmetry.

The transfer material described above can be used as a film for bonding to liquid crystal The transfer material used for the constituent members of the display device is preferably used as a transfer material for manufacturing a liquid crystal panel. The reason for this is that the substrate (usually a glass substrate) contained in the liquid crystal panel has a high barrier property, and after removing and removing the temporary support (barrier member A), the function of protecting the quantum dots can be favorably exhibited. By using it in this way, the thinning of the LCD can be realized without relying on the thinning of the wavelength conversion layer. The aspect in which the above transfer material is used for the production of a liquid crystal panel will be described later.

[Manufacturing method of liquid crystal panel with wavelength conversion member]

Another aspect of the present invention relates to a method of manufacturing a liquid crystal panel with a wavelength converting member, comprising: peeling a barrier member A (temporary support) of the transfer material; and exposing exposed with peeling The surface is bonded to the surface of the liquid crystal panel including at least the liquid crystal cell.

The liquid crystal display device is usually composed of at least a liquid crystal panel including liquid crystal cells and a backlight unit. A wavelength conversion member having a wavelength conversion layer containing quantum dots is conventionally used as a constituent member of a backlight unit in a liquid crystal display device. On the other hand, according to one aspect of the present invention, a liquid crystal panel including a wavelength conversion member can be manufactured.

The method of peeling off the temporary support is not particularly limited. The peeling of the temporary support is preferably performed at a speed at which the transfer product after peeling does not break.

As described above, when an adhesive layer exists between the temporary support and the wavelength conversion member, and the adhesive layer remains on the exposed surface exposed by peeling, the exposed surface can be directly bonded to the surface of the liquid crystal panel. Alternatively, the adhesive may be applied to the exposed surface and then bonded to the surface of the liquid crystal panel. As far as the adhesive is concerned, it is as previously described.

The environment in which the temporary support is peeled off and bonded to the liquid crystal panel is preferably a closed chamber interior, and more preferably in a nitrogen atmosphere, from the viewpoint of preventing contact between the quantum dots contained in the wavelength conversion layer and oxygen. However, even if it is not in the above-described environment, if the temporary support is peeled off and bonded to the liquid crystal panel in a short period of time (for example, within 30 minutes), the wavelength conversion layer can be prevented. The luminous efficiency of quantum dots decreases.

The liquid crystal panel includes a liquid crystal cell. Generally, a polarizing plate (a visual side polarizing plate and a backlight side polarizing plate) is disposed on the visual side and the backlight side, respectively. The transfer material can be bonded to either the surface of the visible-side polarizing plate or the surface of the backlight-side polarizing plate. However, based on the wavelength conversion by the wavelength converting member, the multi-wavelength light source can be easily and satisfactorily realized. It is preferable to fit the backlight side surface of the liquid crystal panel. The back side surface to be bonded may be a backlight side polarizing plate surface. Moreover, it is also preferable to adhere to the surface of the brightness enhancement film or the like provided on the surface of the backlight-side polarizing plate. As the luminance lifting film, a well-known luminance lifting film such as a crepe sheet can be used.

Next, a liquid crystal panel as a transfer target will be described.

(liquid crystal cell)

The driving mode of the liquid crystal cell is not particularly limited, and various modes such as twisted nematic (TN), super twisted nematic (STN), vertical alignment (VA), plane switching (IPS), and optical compensation bending (OCB) can be used.

The liquid crystal cell system usually comprises two substrates and a liquid crystal layer between the two substrates. The substrate is generally a glass substrate, and may also be a plastic substrate. Or a laminated body of glass and plastic. When a plastic substrate is used alone, a material such as PC (polycarbonate) or PES (polyether fluorene) which has little optical anisotropy in the surface is useful, and it does not interfere with the polarization control of the liquid crystal layer. The thickness of one substrate is generally in the range of 50 μm to 2 mm.

The liquid crystal layer of the liquid crystal cell is usually formed by encapsulating a liquid crystal in a space formed by sandwiching a spacer between the two substrates. Usually, a transparent electrode layer is formed on a substrate, which is itself a transparent film containing a conductive substance. The liquid crystal cell is sometimes further provided with a gas barrier layer, a hard coat layer, a layer for the underlying undercoat layer (underlayer) of the transparent electrode layer, and the like. These layers are usually provided on the substrate.

(polarizer)

The visual-side polarizing plate and the backlight-side polarizing plate are not particularly limited, and a polarizing plate which is generally used in a liquid crystal display device can be used without any limitation. For example, a polarizing plate including a stretched film obtained by immersing a polyvinyl alcohol film in an iodine solution and extending it, or the like can be used. The thickness of the polarizer is not particularly limited. The thinner the liquid crystal display device, the thinner the better, and the thickness is preferably a certain thickness in order to maintain the contrast of the polarizing plate. From the above viewpoints, the thickness of the visual side polarizer and the backlight side polarizer is preferably in the range of 0.5 μm to 80 μm, more preferably 0.5 μm to 50 μm, and still more preferably in the range of 1 μm to 25 μm. Further, the thickness of the visual side polarizer and the backlight side polarizer may be the same or different. For details of the polarizer, refer to paragraphs 0037 to 0046 of JP-A-2012-189818.

(protective film)

In the case of a polarizing plate, a protective film is usually provided on one or both sides of the polarizing mirror. In the liquid crystal panel of the transfer object, a visual side polarizer, The backlight side polarizer may also have a protective film on one or both sides thereof. The thickness of the protective film can be appropriately set, and is generally about 1 to 500 μm, preferably 1 to 300 μm, more preferably 5 to 200 μm, from the viewpoints of workability such as strength and handling, and thinning. Good for 5~150μm. Further, the visual side polarizer and the backlight side polarizer may be bonded to the liquid crystal cell without a protective film. The reason is that the liquid crystal cell, especially the substrate, can function as a barrier function.

As the protective film of the polarizing plate, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture resistance, and isotropic properties is preferably used. Specific examples of such a thermoplastic resin include a cellulose resin such as cellulose triacetate, a polyester resin, a polyether oxime resin, a polyfluorene resin, a polycarbonate resin, a polyamide resin, and a polyimide resin. A polyolefin resin, a (meth)acrylic resin, a cyclic polyolefin resin (northene resin), a polyacrylate resin, a polystyrene resin, a polyvinyl alcohol resin, and the like. For details of the resin which can be used as the protective film, reference is made to paragraphs 0049 to 0054 of JP-A-2012-189818.

As the polarizing plate protective film, one or more functional layers may be used on the thermoplastic resin film. Examples of the functional layer include a low moisture permeable layer, a hard coat layer, and an antireflection layer (a refractive index adjusted layer such as a low refractive index layer, a medium refractive index layer, and a high refractive index layer), an antiglare layer, and an antistatic layer. Layer, ultraviolet absorbing layer, and the like. As far as these functional layers are concerned, well-known techniques can be applied without any limitation. The layer thickness of the protective film having a functional layer is, for example, in the range of 5 to 100 μm, preferably 10 to 80 μm, more preferably 15 to 75 μm. Further, it is also possible to laminate only the functional layer on the polarizer under the absence of the thermoplastic resin film.

(adhesive layer, adhesive layer)

The polarizer and the protective film can be attached by a well-known adhesive layer or adhesive layer. For details, for example, paragraphs 0056 to 0059 of JP-A-2012-189818 and paragraphs 0061 to 0063 of JP-A-2012-133296 can be referred to.

(phase difference layer)

The visual side polarizing plate and the backlight side polarizing plate may have at least one phase difference layer between the liquid crystal cell and the liquid crystal cell. For example, the inner polarizing plate protective film on the liquid crystal cell side may have a phase difference layer. As such a retardation layer, a known cellulose-deposited film or the like can be used.

[Manufacturing Method of Liquid Crystal Display Device]

Another aspect of the present invention relates to a method of manufacturing a liquid crystal display device, comprising: fabricating a liquid crystal panel with a wavelength conversion member by the above method; and assembling the liquid crystal panel and the backlight unit to assemble a liquid crystal Display device. From the viewpoint of easily and satisfactorily achieving multi-wavelength light source conversion by wavelength conversion using a wavelength conversion member, it is preferable to combine the liquid crystal panel with the backlight unit so that the wavelength conversion member is disposed on the backlight side.

(backlight unit)

As the backlight, it is known that there is a side illumination method and a direct type. The backlight unit described above may be of any type.

In one aspect, as the light source, a blue light emitting light having a center wavelength of luminescence in a wavelength band of 430 nm to 480 nm, for example, a blue light emitting diode which emits blue light can be used. When used, it can emit blue In the light source, the wavelength conversion member preferably contains at least a quantum dot A which is excited by the excitation light to emit red light and a quantum dot B which emits green light in the same layer or different layers. Thereby, white light can be realized according to the blue light emitted from the light source and penetrating the wavelength converting member, and the red light and the green light emitted from the wavelength converting member.

Alternatively, in another aspect, as the light source, an ultraviolet light having an emission center wavelength in a wavelength band of 300 nm to 430 nm, for example, an ultraviolet light emitting diode, may be used. At this time, in the wavelength conversion member, in the same layer or different layers, it is preferable to simultaneously contain the quantum dots C which can be excited by the excitation light to emit blue light, together with the quantum dots A and B. Thereby, white light can be realized according to the red light, the green light, and the blue light emitted from the wavelength conversion member.

Moreover, in another aspect, the light emitting diode can also be replaced by a laser light source.

Further, as for the backlight unit, a reflection member may be provided at the rear portion of the light source. The reflection member is not particularly limited, and a known one can be used. The contents of these publications are included in the present invention, and are described in Japanese Patent No. 3,416,302, Japanese Patent No. 3,363,565, Japanese Patent No. 4,091,978, and Japanese Patent No. 3,448,626.

In addition to the above, it is also preferable to provide a known diffusion plate, a diffusion sheet, a brightness enhancement film (for example, a BEF series manufactured by Sumitomo 3M Co., Ltd., a DBEF (registered trademark) series manufactured by Sumitomo 3M Co., Ltd., etc.). Reflective polarizer), light guide. The contents of these publications are also included in the present invention, as described in Japanese Patent No. 3,416,302, Japanese Patent No. 3,363,565, Japanese Patent No. 4,091,978, and Japanese Patent No. 3,448,626.

(lighting wavelength)

From the viewpoint of realizing high luminance and high color reproducibility, it is preferable to use a multi-wavelength source as a backlight unit. In a preferred aspect, it is preferable to emit blue light having a center wavelength of luminescence in a wavelength band of 430 to 480 nm and having a peak of a light intensity of a half value width of 100 nm or less, and a light emission center in a wavelength band of 500 to 600 nm. The green light having a peak of a light-emitting intensity having a half-value width of 100 nm or less and a red light having a light-emitting center wavelength in a wavelength band of 600 to 680 nm and having a peak having a half-value width of 100 nm or less.

The wavelength band of the blue light emitted by the backlight unit is preferably in the range of 440 to 480 nm, more preferably in the range of 440 to 460 nm, based on further improvement in luminance and color reproducibility.

Based on the same viewpoint, the wavelength band of the green light emitted by the backlight unit is preferably in the range of 510 to 560 nm, more preferably in the range of 510 to 545 nm.

Further, based on the same viewpoint, the wavelength band of the red light emitted from the backlight unit is preferably in the range of 600 to 650 nm, more preferably in the range of 610 to 640 nm.

Further, based on the same viewpoint, the half value width of each of the luminous intensity of the blue light, the green light, and the red light is preferably 80 nm or less, more preferably 50 nm or less, still more preferably 40 nm or less, and still more preferably 30 nm or less. Among these, the half value width of each of the luminous intensities of blue light is preferably 25 nm or less.

In one embodiment of the liquid crystal display device, at least one of the opposite phases has a liquid crystal cell in which a liquid crystal layer is sandwiched between substrates provided with electrodes, and the liquid crystal cell is disposed between two polarizing plates. The liquid crystal display device includes a liquid crystal cell in which liquid crystal is sealed between the upper and lower substrates, by adding The voltage changes the alignment state of the liquid crystal to display the image. Further, depending on the requirements, a polarizing plate protective film or an optical compensation member for optical compensation, an adhesive layer, and the like may be provided. Further, a front filter layer may be disposed simultaneously (or alternatively) with a color filter substrate, a thin film substrate, a lens film, a diffusion sheet, a hard coat layer, an antireflection layer, a low reflection layer, an antiglare layer, or the like. a surface layer of a primer layer, an antistatic layer, an undercoat layer, or the like.

According to the aspect of the invention described above, the protection of the quantum dots and the thinning of the liquid crystal display device can be achieved.

[Examples]

The invention will be more specifically described below on the basis of examples. The materials, the amounts, the ratios, the treatment contents, the treatment procedures, and the like in the following examples can be appropriately changed without departing from the spirit of the invention. Therefore, the scope of the invention should not be construed as being limited by the specific examples shown below.

I. Examples of transfer materials, comparative examples

[Comparative Example 101]

1. Modulation of polymerizable compositions containing quantum dots

0.54 ml of trimethylolpropane acrylate, 2.4 ml of lauryl methacrylate, and Irgacure (registered trademark) 819 manufactured by BASF Corporation as a photopolymerization initiator were mixed to obtain a polymerizable composition.

To 100 mg of the obtained polymerizable composition, a toluene dispersion of a quantum dot was added, and a quantum dot A having a peak of luminescence in a wavelength range of 600 to 680 nm and an emission center wavelength in a wavelength region shorter than the quantum dot A and having a peak of luminescence were obtained. The concentration of each quantum dot of the quantum dot B located in the wavelength range of 500 to 600 nm was 0.5% by mass, and dried under reduced pressure for 30 minutes. Stirring to the amount The quantum dot dispersion (polymerizable composition containing quantum dots) is obtained until the sub-dots are dispersed.

2. Production of barrier film (barrier member)

(1) Production of inorganic layers

As the substrate, a base film (polyethylene terephthalate (PET) film with a single-sided easy-adhesion layer; COSMOSHINE (registered trademark) A4100 manufactured by Toyobo Co., Ltd., thickness 50 μm, refractive index nu at a wavelength of 535 nm was used. (535): 1.62), disposed in the chamber of the magnetron sputtering device. Using a tantalum nitride for the target system, a film was formed on the easy-to-surface side under the following film formation conditions, and the thickness of the tantalum nitride was set to 1 μm.

Film formation pressure: 2.5 × 10 ^-1 Pa

Argon flow rate: 20sccm

Nitrogen flow rate: 9sccm

Frequency: 13.56MHz

Power: 1.2kW

(2) Production of organic layers

On the inorganic layer obtained in the above (1), a resin having a ruthenium polymer having a ruthenium skeleton was applied by a spin coating method, and heated at 160 ° C for 1 hour to form an organic layer. The thickness of the organic layer was 2 μm. In this way, a barrier film (barrier member) is obtained. Further, as a result of measuring the barrier properties of the obtained barrier film by the above method, the oxygen permeability was 0.1 cm ³ /(m ² .day.atm) or less, and the water vapor permeability was 0.5 g/(m ² .day) or less. .

According to the above procedure, a total of two barrier films were produced.

3. Production of non-transfer materials

Coating on the surface of the substrate film of the barrier film produced in the above 2. 1. The prepared quantum dot dispersion is made to have a thickness of up to 50 μm, and the other film is superposed on the surface of the substrate film as the quantum dot dispersion side, thereby forming a photosensitive film sandwiched by two barrier films. Floor.

The photosensitive layer was exposed to ultraviolet light at a rate of 5 J/cm ² in a nitrogen atmosphere using a UV exposure machine (EXECURE 3000W manufactured by HOYA CANDEO OPTRO NICS Co., Ltd.) to cure the photosensitive layer, thereby obtaining a non-transfer material 101.

[Comparative Example 102]

A non-transfer was obtained in the same manner as the production of the non-transfer material 101 except that a base film (PET film; COSMOSHINE A4300 manufactured by Toyobo Co., Ltd., thickness: 50 μm) having a double-sided easy-adhesion layer was used as the substrate of the barrier film. Material 102.

[Example 103]

A substrate film (PET film; COSMOSHINE A4300 manufactured by Toyobo Co., Ltd., thickness: 50 μm) with a double-sided easy-adhesion layer was used as a substrate of one of the barrier films (barrier member B), and a base with a single-sided easy-adhesion layer was used. A material film (PET film; COSMOSHINE A4300 manufactured by Toyobo Co., Ltd., thickness: 50 μm) is used as a base material of another barrier film (barrier member A), and a quantum dot dispersion is applied so that the thickness is 100 μm, and the non-transfer material 101 is used. The transfer material 103 was obtained in the same manner.

[Example 104]

In addition to adding cerium oxide particles as light scattering particles to a quantum dot dispersion (sicastar manufactured by Corefront Co., Ltd.; particle diameter (primary particle diameter) measured in a wavelength conversion layer of 100 nm), and coating a quantum dot dispersion to complete thickness The same as 100 μm, the same as the production of the non-transfer material 102 The transfer material 104 is obtained in a manner.

Further, the cross section of the transfer material 104 was observed with an optical microscope, and the added cerium oxide particles were biased in the vicinity of the interface between the barrier member A and the wavelength conversion layer.

[Example 105]

In addition to adding a cerium oxide particle as a light-scattering particle to a quantum dot dispersion (sicastar manufactured by Corefront Co., Ltd.; particle diameter (primary particle diameter) measured in a wavelength conversion layer of 500 nm), and coating a quantum dot dispersion liquid, the thickness is completed. The transfer material 105 was obtained in the same manner as the production of the non-transfer material 102 except 100 μm.

Further, the cross section of the transfer material 105 was observed with an optical microscope, and the added cerium oxide particles were biased in the vicinity of the interface between the barrier member A and the wavelength conversion layer.

[Example 106]

In addition to adding a cerium oxide particle as a light-scattering particle to a quantum dot dispersion (Sicastar manufactured by Corefront Co., Ltd.; particle diameter (primary particle diameter) measured in a wavelength conversion layer of 4 μm), and coating a quantum dot dispersion to complete the thickness The transfer material 106 was obtained in the same manner as the production of the non-transfer material 102 except 100 μm.

Further, the cross section of the transfer material 106 was observed with an optical microscope, and the added cerium oxide particles were biased in the vicinity of the interface between the barrier member A and the wavelength conversion layer.

[Example 107]

In addition to using the barrier film with a particle layer obtained by the following method as the barrier member A, and coating the quantum dot dispersion, the finished thickness becomes The transfer material 107 was obtained in the same manner as the production of the non-transfer material 102 except 100 μm.

<Production of a barrier film with a particle layer>

Titanium oxide slurry (trade name HTD-760T, manufactured by TAYCA Co., Ltd.; particle diameter (primary particle diameter) of titanium oxide particles measured in a barrier member: 15 nm), oxime derivative acrylate (trade name, manufactured by Osaka Gas Chemicals Co., Ltd.) OGSOL EA-0200) and toluene were dissolved by stirring with a roll or a stirrer, and the titanium oxide particles were further dispersed by ultrasonic waves to prepare a titanium oxide-dispersed toluene liquid. The volume ratio of the titanium oxide particles in the prepared titanium oxide-dispersed toluene liquid to the resin material (anthracene derivative acrylate), titanium oxide: resin material = 25:75.

The titanium oxide-dispersed toluene liquid was crosslinked with acrylic particles (particle diameter (primary particle diameter) observed in the barrier member: 1.5 μm; trade name: EX-150, manufactured by Soken Chemical Co., Ltd.) and toluene as a stirrer It is mixed while stirring. The volume ratio of the solid content of the titanium oxide-dispersed toluene liquid to the crosslinked acrylic particles was 50:50. Further, the crosslinked acrylic particles were sufficiently dispersed by ultrasonic waves, and further stirred with a stirrer.

To the mixed liquid thus obtained, a polymerization initiator (trade name: IRGACURE 819, manufactured by BASF Corporation) was added to obtain a composition for forming a particle-containing layer.

The resulting particle-containing layer is formed into a composition, The barrier film was applied to the easy-adhesion layer of the barrier member produced in the above Comparative Example 101 by a metal bar, and then cured by ultraviolet irradiation (wavelength: 365 nm) for 10 minutes to form particles. Layer (thickness 5 μm).

Thus, a barrier film with a particle-containing layer was obtained. Scanning electronics Observation of the microscope confirmed that the particles were present as primary particles in the particle-containing layer.

[Example 108]

1. Modulation of polymerizable compositions containing quantum dots

The following polymerizable composition A containing quantum dots was prepared, filtered through a polypropylene filter paper having a pore size of 0.2 μm, and dried under reduced pressure for 30 minutes to be used as a coating liquid.

As the toluene solution of the quantum dot 1, a dispersion containing a quantum dot (luminous maximum: 535 nm) capable of emitting green light (CZ520-100 manufactured by NN-Labs Co., Ltd.) was used. Further, as the toluene solution of the quantum dot 2, a dispersion liquid (CZ620-100 manufactured by NN-Labs Co., Ltd.) containing a quantum dot (luminous maximum: 630 nm) capable of emitting red light was used. Each of the quantum dots 1 and 2 is a quantum dot containing CdSe as a core, ZnS as a shell portion, and octadecylamine as a ligand, and is dispersed in toluene at a concentration of 3% by mass in the toluene dispersion. in.

2. Production of barrier film (barrier member)

As a support for the barrier film, a base film (PET film; COSMOSHINE A4300 manufactured by Toyobo Co., Ltd., thickness: 50 μm) having two easy-adhesion layers was used, and the first organic layer was sequentially formed on the one-side side of the support in the following order. Inorganic layer.

Trimethylolpropane triacrylate (TMPTA manufactured by Daicel-Cytec Co., Ltd.) and photopolymerization initiator (ESACURE KTO46 manufactured by Lamberti Co., Ltd.) were prepared and weighed in a mass ratio of 95:5 to dissolve these in the methyl group. Ethyl ketone was adjusted to a coating liquid having a solid concentration of 15% by mass. This coating liquid was applied onto the PET film by a roll coater by a roll coater, and passed through a drying zone having an ambient temperature of 50 ° C for 3 minutes. Thereafter, the ultraviolet rays were irradiated under a nitrogen atmosphere (the cumulative irradiation amount was about 600 mJ/cm ² ), hardened by ultraviolet light curing, and wound up. The thickness of the first organic layer formed on the support was 1 μm.

Next, an inorganic layer (tantalum nitride layer) is formed on the surface of the first organic layer by a roll-to-roll type CVD (Chemical Vapor Deposition) apparatus. As the material gas, decane gas (flow rate: 160 sccm), ammonia gas (flow rate: 370 sccm), hydrogen gas (flow rate: 590 sccm), and nitrogen gas (flow rate: 240 sccm) were used. As a power source, a high frequency power source having a frequency of 13.56 MHz is used. The film forming pressure was 40 Pa and the thickness was 50 nm.

The barrier film 11 having an inorganic layer on the surface area of the first organic layer formed on the support is thus formed.

Further, a barrier film 12 having a second organic layer on the surface of the inorganic layer of the barrier film 11 produced in the same manner as described above was produced in the following order.

The second organic layer is relative to the acrylic acid containing a urethane bond 95.0 parts by mass of an ester polymer (ACRIT 8 BR930, manufactured by TAISEI FINE CHEMICAL CO., LTD.), weighing 5.0 parts by mass of a photopolymerization initiator (Irg 184 manufactured by BASF Corporation), and dissolving them in methyl ethyl ketone to adjust the solid concentration to 15 % by mass of coating liquid.

This coating liquid was directly applied to the surface of the inorganic layer of the barrier film 11 by a roll coater by a roll coater, and passed through a drying zone having an ambient temperature of 100 ° C for 3 minutes. Thereafter, the barrier film 11 coated with the coating liquid as described above was wound around a heating roller heated to a surface temperature of 60 ° C, irradiated with an ultraviolet ray (accumulated irradiation amount of about 600 mJ/cm ² ) to be cured, and wound up. The thickness of the second organic layer thus formed on the inorganic layer of the barrier film 11 was 1 μm.

In this manner, the barrier film 12 having the first organic layer, the inorganic layer, and the second organic layer in this order on the support is formed.

3. Production of transfer materials

The resistive film 12 having the second organic layer produced in the above-described procedure is used as the first film, and the barrier film 11 is used as the second film, and the transfer material is obtained by referring to the manufacturing steps described in FIGS. 1 and 2 . . Specifically, the first film and the second film are prepared, and the film is continuously conveyed at a tension of 1 m/min and 60 N/m while being coated on the second organic layer of the first film (barrier film 12) by a die coater. The polymerizable composition A containing quantum dots was prepared to form a coating film having a thickness of 50 μm. Next, the first film (barrier film 12) on which the coating film is formed is wound around the backing roll, and the second film (barrier film 11) is laminated on the coating film with the inorganic layer in contact with the coating film. While continuously transporting the coating film in the first film and the second film, the film was passed through a heating zone at an ambient temperature of 100 ° C for 3 minutes. Thereafter, a 160 W/cm air-cooled metal halide lamp (manufactured by EYE GRAPHICS Co., Ltd.) was irradiated with ultraviolet rays to be cured to form a wavelength conversion layer containing quantum dots. The amount of ultraviolet rays irradiated was 2000 mJ/cm ² . Further, L1 is 50 mm, L2 is 1 mm, and L3 is 50 mm.

The coating film is cured by the irradiation of the ultraviolet rays to form a hardened layer (wavelength conversion layer) to prepare a transfer material. The thickness of the hardened layer (wavelength conversion layer) obtained by curing the polymerizable composition A containing quantum dots was about 50 μm. Thus, it is obtained that the barrier film 12 and the barrier film 11 are respectively provided on both surfaces of the wavelength conversion layer, and the one-side surface of the wavelength conversion layer is adjacent to (directly connected to) the inorganic layer of the barrier film 11, and the other surface and the barrier are blocked. The second organic layer of film 12 is adjacent to transfer material 108.

A plurality of non-transfer materials of the above comparative examples and transfer materials of the examples were produced, and one of them was used for the production of the liquid crystal display device described below, and the others were evaluated as the following peelability evaluation and adhesion evaluation. Use with samples.

II. Embodiments and Comparative Examples Related to Liquid Crystal Display Devices

[Example 203]

As a result of disassembling the product of the iPad (registered trademark) 2 manufactured by Apple Inc. of the tablet PC, the backlight side polarizing plate of the liquid crystal panel was adhered to the wafer.

The barrier film A (temporary support) of the wavelength conversion member 103 is peeled off, and the exposed wavelength conversion member and the enamel sheet adhered to the backlight-side polarizing plate of the liquid crystal panel are bonded via an acrylic adhesive.

A filter that allows only blue light to pass through is disposed between the LED module attached to the reflector and the light guide plate. Thereby, blue light is emitted from the backlight unit, and is incident on the liquid crystal panel.

Thereafter, the liquid crystal display device 203 is obtained by assembling again.

[Examples 204 to 208]

The liquid crystal display devices 204 to 208 are produced in the same manner as the liquid crystal display device 203.

[Comparative Examples 201, 202]

The ruthenium of the backlight-side polarizing plate adhered to the liquid crystal panel of the flat-panel PC and the organic layer of the barrier member A of the non-transfer materials 102 and 102, which are decomposed in the same manner as the production of the liquid crystal display device 203, are adhered via acrylic. The agent fits.

Thereafter, the liquid crystal display devices 201 and 202 are obtained by assembling again.

III. Assessment method

1. Peelability evaluation of barrier member A (temporary support)

With respect to the barrier member A of the transfer materials 103 to 108 of the examples, the 90° peel adhesion was measured by the method described in JIS Z 0237. From the measured values of the peeling adhesion, the peeling property of the barrier member A (temporary support) was evaluated according to the following evaluation criteria.

A: The 90° peel adhesion is 0.2 N/10 mm or less.

B: 90° peel adhesion is greater than 0.2N/10mm.

2. Adhesion evaluation of barrier member B

The cross-cut test described in JIS K 5600 was performed on the barrier member B of the transfer materials 103 to 108 of the examples. According to the number of test pieces remaining after the cross-cut test, the adhesion of the barrier member B was evaluated according to the following evaluation criteria. When the evaluation result is A, it can be judged that peeling or partial peeling of the barrier member B does not occur at the time of peeling of the barrier member A (temporary support).

A: After the cross-cut test, 50 of the 100 test pieces remained above.

B: After the cross-cut test, only 49 of the 100 test pieces remained below.

3. Positive brightness

The white light of the liquid crystal display devices 201 to 208 was measured, and the front luminance of the emitted light was measured by a measuring machine (EZ-Contrast 160D, manufactured by ELDIM Co., Ltd.), and evaluated according to the following evaluation criteria.

A: The front luminance is 320 cd/m ² or more.

B: The front luminance is 200 cd/m ² or more and less than 320 cd/m ² .

C: The front luminance is less than 200 cd/m ² .

4. Confirmation of the existence of the particle bias

The profile of the particles in the surface layer region of the barrier member A of the wavelength conversion layer of the transfer materials 104 to 106 was observed by a scanning electron microscope (JSM670 model manufactured by JEOL Co., Ltd.), and the cross section cut out by Microtome was observed to measure the particles. The number and coordinates are quantified according to the above formula 2. The quantitative values of the transfer materials 104 to 106 were both Φ = 0.1. As a result, it was confirmed that the particles in the surface layer region of the barrier member A on the wavelength conversion layer of the transfer materials 104 to 106 were biased. Further, it was also confirmed that the particles were present as primary particles in the surface layer region.

The layer structure of the transfer material of the examples described above and the non-transfer material of the comparative example and the evaluation results are shown in FIGS. 3 to 10 .

As shown in Fig. 3 to Fig. 8, the peeling property evaluation results of the transfer material of the embodiment, the barrier member A (temporary support) are all A, temporarily The interface between the support and the wavelength converting member is such that it can be easily peeled off. Further, from the results shown in Figs. 3 to 8, it was confirmed that the transfer material of the example was excellent in adhesion between the barrier member B and the wavelength converting member of the barrier member which was not removed by transfer. In such a manner that the adhesion between the barrier member B and the wavelength converting member is good, when the force for peeling off the barrier member A of the temporary support is applied, the barrier member B can be prevented from being partially or completely peeled off, which is preferable. . Further, by preventing the occurrence of such peeling, it is possible to prevent the quantum dots contained in the wavelength conversion layer of the wavelength conversion member from being deteriorated by the barrier member B after the transfer.

For the reference, the peeling property evaluation result of the barrier member A of the non-transfer material 102 of the comparative example was similarly evaluated, and the evaluation result was B; the result of the adhesion evaluation of the barrier member A of the non-transfer material 102, the evaluation result For B.

In the liquid crystal display device of the example, after the blue light was continuously irradiated by the backlight for 1000 hours, the positive luminance after the continuous irradiation was measured in the same manner as described above, and the liquid crystal display devices of the examples all showed the positive luminance before the irradiation. More than 90% positive brightness. The inventors of the present invention have found that the quantum dots contained in the wavelength conversion layer are protected by the barrier member A (temporary support) before being transferred to the liquid crystal panel, and are protected by the liquid crystal panel after transfer to suppress deterioration. result. Further, since the liquid crystal display device of the embodiment does not include the barrier member A which is peeled off as a temporary support, the thickness of the barrier member A is reduced, and the thickness of the liquid crystal display device is reduced.

Further, the liquid crystal display device of the example showed higher front luminance than the liquid crystal display device of the comparative example (Figs. 3 to 10). Recognize For this reason, the wavelength conversion layer containing quantum dots as a light-emitting material is thicker than the liquid crystal display device of the comparative example. Although the wavelength conversion layer is thickened as such, since the barrier member A as a temporary support is peeled off, the total thickness of the liquid crystal panel with the wavelength conversion layer is still the same as in the comparative example. According to the present invention, the liquid crystal display device can be made thinner without depending on the thickness reduction of the wavelength conversion layer.

[Industrial availability]

The present invention is useful in the field of manufacturing liquid crystal display devices.

Claims (16)

A transfer material is provided on a barrier member A as a temporary support, and includes a wavelength conversion member having a wavelength conversion layer containing quantum dots excited by excitation light and emitting fluorescence, and a barrier member B. The transfer material of claim 1, which is a transfer material for manufacturing a liquid crystal panel. The transfer material of claim 1 or 2, wherein the most surface of the barrier member A side of the wavelength converting member is an easily peelable surface. The transfer material of claim 3, wherein the wavelength conversion member has a particle-biased existence region in which a particle having a particle diameter of 100 nm or more is present in a surface layer region of the barrier member A side, and the easily peelable surface is a surface of the particle-biased region. The transfer material of claim 3, wherein the wavelength conversion member has a particle-biased existence region in which particles having a particle diameter of 500 nm or more are present in a surface layer region of the barrier member A side, and the easily peelable surface is a surface on which the particle is biased to exist. The transfer material of claim 1 or 2, wherein the most surface of the wavelength converting member side of the barrier member A is an easily peelable surface. The transfer material of claim 6, wherein the most surface layer of the wavelength conversion member side of the barrier member A is a particle-containing layer, and the surface of the particle-containing layer is the easy-peelable surface. The transfer material of claim 1 or 2, wherein the most surface layer of the wavelength conversion member side of the barrier member A is an inorganic layer. The transfer material of claim 1 or 2, wherein the barrier member A has an easy Then the layer. The transfer material of claim 1 or 2, wherein the barrier member A has an easy-to-attach layer, and the outermost layer of the wavelength conversion member side is an inorganic layer. The transfer material of claim 1 or 2, wherein the barrier member B has an easy-to-attach layer. The transfer material of claim 1 or 2, wherein the barrier member A and the barrier member B each comprise at least one layer selected from the group consisting of an inorganic layer and an organic layer. A method of manufacturing a liquid crystal panel with a wavelength conversion member, comprising: peeling a barrier member A of a transfer material according to any one of claims 1 to 12; and exposing an exposed surface exposed with peeling, and at least The liquid crystal panel including the liquid crystal cell is surface-bonded. A method of manufacturing a liquid crystal panel with a wavelength conversion member according to claim 13, wherein the exposed surface is bonded to a backlight side surface of the liquid crystal panel. A method of manufacturing a liquid crystal panel with a wavelength conversion member according to claim 13, wherein the liquid crystal panel has a visual side polarizing plate and a backlight side polarizing plate sandwiching the liquid crystal cell. A method of manufacturing a liquid crystal display device, comprising: fabricating a liquid crystal panel with a wavelength conversion member by the method of claim 13; and assembling the liquid crystal panel and the backlight unit to assemble a liquid crystal display device.