KR102469212B1 - Liquid crystal display device and manufacturing method thereof - Google Patents

Abstract

In a liquid crystal display device having a wavelength conversion layer that outputs wavelength-converted light and a polarization layer disposed between the wavelength conversion layer and the liquid crystal layer, suppressing the transmission of moisture between the polarization layer and the liquid crystal layer Prepare a barrier coating layer for

Description

Liquid crystal display device and manufacturing method thereof

The present invention relates to a liquid crystal display device and a manufacturing method thereof.

In recent years, display devices such as liquid crystal display devices and organic electroluminescence display devices have become widespread. A general liquid crystal display device is a non-emission type display device. Light from a backlight using a white LED or the like as a light source is light-modulated for each pixel in a liquid crystal layer, and each of red (R), green (G), and blue (B) Color display is performed by passing through the color filter layer. The white LED has features such as high luminous efficiency and long life. On the other hand, the white LED has a large light loss due to a decrease in luminous efficiency of the phosphor due to heat generation (so-called temperature quenching). Further, because of the structure in which the light from the white LED is separated into red, green, and blue by the color filter layer, only about 1/3 of the light of the backlight is actually used, and the light utilization efficiency of the entire liquid crystal display device is low.

Further, a liquid crystal display device of a type that uses an ultraviolet light source as a backlight and uses the ultraviolet light source as excitation light to emit light of red, green, and blue phosphor layers is disclosed. In addition, a blue LED is used as a backlight, and the red and green phosphor layers emit light using blue light output from the blue LED to obtain red and green lights, and the blue light from the blue LED is transmitted as it is to transmit blue light. Disclosed is a liquid crystal display device of a type that displays.

In addition, a pair of substrates sandwiched by a liquid crystal layer, a light emitting diode disposed on the back surface of one side of the pair of substrates and emitting light in a range of peak wavelengths of 380 nm to 420 nm, and a light emitting diode disposed on the other side of the pair of substrates. A phosphor having a polarizing plate formed on the other side of the pair of substrates, on the side opposite to the liquid crystal layer of the polarizing plate formed on the other side of the pair of substrates, absorbs light having a peak wavelength in the range of 380 nm to 420 nm for each unit pixel to emit light of a predetermined color. Disclosed is a liquid crystal display device having a subpixel having a layer and having a filter layer formed on a surface opposite to a liquid crystal layer of a phosphor layer to reflect or absorb light having a wavelength of 420 nm or less.

However, there is a problem that visibility under outdoor light is not sufficient in any display device. Although a reflective liquid crystal display device has been proposed as a display device with high visibility under outdoor light, there is a problem that visibility is low in a dark place.

Accordingly, an object of the present invention is to provide a novel liquid crystal display device having improved visibility under outdoor light without reducing visibility in a dark place.

One aspect of the present invention is a liquid crystal display device, including a wavelength conversion layer that outputs wavelength-converted light, and a polarization layer disposed between the wavelength conversion layer and a liquid crystal layer, the polarization layer and the liquid crystal It is characterized in that a barrier coating layer for suppressing the permeation of moisture is provided between the layers.

One aspect of the present invention is used in a liquid crystal display device having, as a polarizing element, a wavelength conversion layer that outputs wavelength-converted light, and a polarization layer disposed between the wavelength conversion layer and the liquid crystal layer; It is characterized by having a barrier coating layer disposed between the polarization layer and the liquid crystal layer to suppress transmission of moisture.

One aspect of the present invention is a liquid crystal display device, comprising a wavelength conversion layer for outputting wavelength-converted light, and a polarizing layer disposed between the wavelength conversion layer and a liquid crystal layer, wherein the polarization layer has a moisture content of Characterized in that it is 3% or less.

One aspect of the present invention is a method for manufacturing the liquid crystal display device, characterized in that the polarizing layer is formed by attaching it to a substrate after an annealing treatment.

One aspect of the present invention is a method for manufacturing the liquid crystal display device, characterized in that the polarizing plate is formed by attaching it to a substrate and then subjecting it to an annealing treatment.

One aspect of the present invention is used as a polarizing element in a liquid crystal display device having a wavelength conversion layer for outputting wavelength-converted light, disposed between the wavelength conversion layer and the liquid crystal layer, and having a moisture content of 3% It is characterized by having the following polarization layer.

ADVANTAGE OF THE INVENTION According to this invention, the new liquid crystal display device which improved visibility under outdoor light can be provided, without reducing visibility in a dark place.

1 is a diagram showing the configuration of a liquid crystal display device in a first embodiment.
Fig. 2 is a diagram showing the configuration of a liquid crystal display device in a second embodiment.
3 is a diagram for explaining a problem of a conventional wavelength conversion layer.
4 is a diagram showing the configuration of a wavelength conversion layer in a modified example.
5 is a diagram showing the configuration of a wavelength conversion layer in a modified example.
6 is a diagram showing the configuration of a wavelength conversion layer in a modified example.
7 is a diagram showing the configuration of a wavelength conversion layer in a modified example.
8 is a diagram showing the configuration of a wavelength conversion layer in a modified example.
9 is a diagram showing the configuration of a wavelength conversion layer in a modified example.
10 is a diagram showing an example of transmittance of a color filter that absorbs light in a red wavelength region.
11 is a diagram showing an example of transmittance of a color filter that absorbs light in red and green wavelength regions.

<First Embodiment>

As shown in the cross-sectional schematic diagram of FIG. 1, the liquid crystal display device 100 in the first embodiment includes a polarizing plate 10, an optical compensation layer 12, a TFT substrate 14, an interlayer insulating film 16, a display electrode 18, alignment film 20, liquid crystal layer 22, alignment film 24, common electrode 26, barrier coating layer 28, polarization layer 30, wavelength conversion layer 32, counter substrate 34 ) and a backlight 36.

As indicated by arrows, the liquid crystal display device 100 functions as a device that receives light from the backlight 36 and outputs light converted in wavelength by the wavelength conversion layer 32 from the side of the polarizer 10 to display an image. do. In addition, the liquid crystal display device 100 may positively use external light incident from the polarizing plate 10 side, convert the wavelength of external light in the wavelength conversion layer 32 and output the same. In addition, FIG. 1 is a schematic diagram, and the size and thickness of each component do not reflect actual values.

In this embodiment, an active matrix type liquid crystal display device is described as an example as the liquid crystal display device 100, but the scope of application of the present invention is not limited to this, and it can also be applied to liquid crystal display devices of other modes such as simple matrix type do.

The TFT substrate 14 is configured by arranging TFTs for each pixel on the substrate. The substrate is a transparent substrate such as glass. The substrate mechanically supports the liquid crystal display device 100 and is used to transmit light to display an image. The substrate may be a flexible substrate made of a resin such as an epoxy resin, a polyimide resin, an acrylic resin, or a polycarbonate resin.

In Fig. 1, two TFTs are shown. A gate electrode 14a connected to a gate line is disposed at a lower portion (on the substrate) of the TFT approximately in the middle. A gate insulating film 14b is formed to cover the gate electrode 14a, and a semiconductor layer 14c is formed to cover the gate insulating film 14b. The gate insulating film 14b is formed of an insulator such as SiO ₂ , for example. In addition, the semiconductor layer 14c is formed of amorphous silicon or polysilicon, a portion immediately above the gate electrode 14a becomes a channel region containing almost no impurities, and a source region on both sides of which conductivity is imparted by impurity doping. and a drain region. A contact hole is formed on the drain region of the TFT, a drain electrode of metal (eg aluminum) is disposed (electrically connected) thereto, a contact hole is formed on the source region, and a metal (eg aluminum) drain electrode is disposed thereon. For example, a source electrode of aluminum) is disposed (electrically connected). The drain electrode is connected to a data line to which a data voltage is supplied.

A polarizing plate 10 is formed on the surface of the TFT substrate 14 on the side where TFTs are not formed. A polarizing plate 10 is formed so as to cover the surface of the substrate of the TFT substrate 14 . The polarizing plate 10 preferably includes a dyed-type polarizing element in which a PVA (polyvinyl alcohol)-based resin is dyed with an iodine-based material or a dichroic dye.

On the surface of the TFT substrate 14 on the side where the TFTs are formed, a display electrode 18 is provided with an interlayer insulating film 16 interposed therebetween. This display electrode 18 is an individual electrode separated for each pixel, and is, for example, a transparent electrode made of ITO (indium tin oxide) or the like. The display electrode 18 is connected to a source electrode formed on the TFT substrate 14 .

An alignment layer 20 covering the display electrode 18 and vertically aligning the liquid crystal is formed. The alignment film 20 is made of a resin material such as polyimide. The alignment film 20 is cured by, for example, printing a 5 wt% solution of N-methyl-2-pyrrolidinone, which is a polyimide resin, on the display electrode 18 and heating at about 180°C to 280°C. After that, it can be formed by orientation treatment by rubbing with rubbing clothes.

Next, the configuration and manufacturing method on the counter substrate 34 side will be described. The counter substrate 34 is a transparent substrate such as glass. The counter substrate 34 is used to mechanically support the liquid crystal display device 100 and transmit light from the backlight 36 to enter the wavelength conversion layer 32 or the like. The counter substrate 34 may be a flexible substrate made of a resin such as an epoxy resin, a polyimide resin, an acrylic resin, or a polycarbonate resin.

On the counter substrate 34, a wavelength conversion layer 32 is formed. The wavelength conversion layer 32 is arranged in a matrix form in the in-plane direction of the counter substrate 34 for each pixel. As the wavelength conversion layer 32, any one of a phosphor, a quantum dot, and a quantum rod that receives light from the backlight 36 and emits light in a specific wavelength range may be used.

The phosphor is preferably a material that emits any one of red (R), green (G), and blue (B) light for each pixel. A Eu-activated sulfide-based red phosphor may be used as the red phosphor, an Eu-activated sulfide-based green phosphor may be used as the green phosphor, and a Eu-activated phosphate-based blue phosphor may be used as the blue phosphor. The wavelength conversion layer 32 can contain a single or a plurality of phosphors depending on the color to be displayed.

For example, when two types of phosphors that absorb light from the backlight 36 or external light in the range of 380 nm or more and 460 nm or less to emit blue light and yellow light are included, white light can be similarly obtained. have. In addition, white light can be similarly obtained even when three kinds of phosphors that emit red light, green light, and blue light are included. In addition, by properly selecting and using a single or a plurality of phosphors that emit light of an arbitrary color by absorbing light or external light from the backlight 36 having a peak wavelength in the range of 380 nm to 460 nm, light of an arbitrary color can be obtained. A liquid crystal display device capable of emitting is obtained.

In addition, for example, in the case of containing two types of phosphors that absorb light from the backlight 36 in the wavelength range of ultraviolet light of 380 nm or less and emit blue light and yellow light that emits light in a desired wavelength range , similarly white light can be obtained. In addition, white light can be similarly obtained even when three kinds of phosphors that emit red light, green light, and blue light are included. In addition, a liquid crystal capable of emitting light of any color by appropriately selecting and using a single or a plurality of phosphors absorbing light from the backlight 36 having a peak wavelength of 380 nm or less and emitting light of any color. A display device is obtained.

In addition, the wavelength conversion layer 32 can also be realized by a quantum dot structure in which semiconductor materials having a plurality of different characteristics are periodically arranged three-dimensionally or a quantum rod in which two-dimensionally periodically arranged. A quantum dot or a quantum rod functions as a material having a desired band gap by repeatedly arranging semiconductor materials having different bad gaps at a cycle of nm order, and receives light from the backlight 36 to form a wavelength range according to the band gap. It can be used as a wavelength conversion layer 32 that emits light of. Specifically, a quantum dot structure or quantum rod structure having a characteristic of absorbing light in the wavelength range of the output light of the backlight 36 and emitting any one of red (R), green (G), and blue (B) light form

A quantum dot can have, for example, a structure in which a central core (core) is formed of cadmium selenide (CdSe) and the outside is covered with a coating layer (shell) of zinc sulfide (ZnS). By changing this diameter, the emission color can be controlled. For example, when emitting red (R), the diameter is 8.3 nm, when emitting green (G), 3 nm in diameter, and when emitting blue (B), the diameter may be smaller. As the core material, indium phosphide (InP), indium copper sulfide (CuInS2), carbon, graphene, or the like may be used.

Full-color display by forming and placing the wavelength conversion layer as a phosphor or quantum dot or quantum rod that emits red (R), green (G), or blue (B) light by patterning at a location corresponding to the display electrode becomes possible In the patterning process, a phosphor material or quantum dot material or quantum rod material that emits red (R), green (G), or blue (B) light is dispersed in a photosensitive polymer, and the dispersion is applied onto the substrate 34 by a coater. It is realized by coating, forming, exposing, and developing. A black matrix may be formed between the respective colors to prevent color mixing between display pixels.

On the wavelength conversion layer 32, a polarization layer 30 is formed. The polarization layer 30 preferably includes a dye-type polarizing element in which dyeing is performed with a dichroic dye on a PVA (polyvinyl alcohol)-based resin. Here, the dye material preferably contains an azo compound and/or a salt thereof.

That is, it is preferable to use a dye-based material that satisfies the following chemical formula.

(1) In the formula, R1 and R2 each independently represent a hydrogen atom, a lower alkyl group, and a lower alkoxyl group, and n is 1 or 2 to represent an azo compound and a salt thereof.

(2) The azo compound according to (1), wherein each of R1 and R2 is independently a hydrogen atom, a methyl group, or a methoxy group, and a salt thereof.

(3) The azo compound according to (1), wherein R1 and R2 are hydrogen atoms, and salts thereof.

For example, it is preferable to use the material obtained by the process shown below. 13.7 parts of 4-aminobenzoic acid are added to 500 parts of water and dissolved with sodium hydroxide. The resulting material is cooled, 32 parts of 35% hydrochloric acid is added at 10°C or less, then 6.9 parts of sodium nitrite is added, and the mixture is stirred at 5 to 10°C for 1 hour. 20.9 parts of sodium aniline-omega-methanesulfonate is added thereto, and sodium carbonate is added to adjust the pH to 3.5 while stirring at 20 to 30°C. Further, the coupling reaction is completed by stirring, followed by filtration to obtain a monoazo compound. The obtained monoazo compound is stirred at 90 degreeC in sodium hydroxide presence, and 17 parts of monoazo compounds of Formula (2) are obtained.

After dissolving 12 parts of the monoazo compound of formula (2) and 21 parts of 4,4'-dinitrostilbene-2,2'-sulfonic acid in 300 parts of water, 12 parts of sodium hydroxide are added and a condensation reaction is effected at 90°C. Then, after reducing with 9 parts of glucose, salting out with sodium chloride, and filtering, 16 parts of an azo compound represented by Formula (3) are obtained.

In addition, 0.01% of the dye of compound (3), 0.01% of C I Direct Red 81, 0.03% of the dye represented by the following structural formula (4) shown in Example 1 of Japanese Patent No. 2622748, In Example 23 of Japanese Laid-Open Patent Publication No. 60-156759, a polyvinyl film having a thickness of 75 μm is used as a substrate in an aqueous solution at 45° C. at a concentration of 0.03% of a dye represented by the following structural formula (5) and 0.1% of a saltpeter. Soak in alcohol (PVA) for 4 minutes. This film is stretched 5 times at 50°C in a 3% aqueous solution of boric acid, washed with water and dried while maintaining a tensioned state. In this way, a dye-based material of neutral color (gray at the parallel position and black at the orthogonal position) can be obtained.

A typical polarizing element is an iodine-based polarizing element formed of a material dyed with iodine and an iodine compound on a resin. However, iodine and iodine compounds are weak against heat and are changed in quality by heating at about 100°C. On the other hand, a polarizing element using a dye (dichroic dye) is relatively resistant to heat and can prevent deterioration if heated at about 130°C. Therefore, it is possible to form the polarization layer 30 between the counter substrate 34 and the alignment film 24 without being affected by the film formation temperature at the time of forming the alignment film 24 or the common electrode 26 described later. It happens.

In addition, it is desirable to set the moisture content of the polarization layer 30 to 3% or less, preferably 1% or less, and more preferably 0.1% or less. That is, by reducing the moisture content of the polarization layer 30 , it is possible to make it difficult for moisture contained in the polarization layer 30 to reach the common electrode 26 or the liquid crystal layer 22 .

In this way, by suppressing the water content of the polarization layer 30 to a low level, it is difficult for moisture contained in the polarization layer 30 to reach the common electrode 26 or the liquid crystal layer 22, and the common electrode 26 due to moisture However, deterioration of the liquid crystal layer 22 can be suppressed.

In addition, the water content is expressed as (the total weight of the water weight/polarization layer 30 in the polarization layer 30) × 100 (%). Moisture content can be measured by the Karl Fischer method or the heating weight change method. The moisture content in this embodiment shall mean the moisture content measured by applying the Karl Fischer method or the heating weight change method.

As the Karl Fischer method, the moisture content can be measured by using a moisture vaporizer (VA200 type) attached to a moisture measuring device (CA-200 type or KF-200 type) manufactured by Mitsubishi Chemical Analyst.

In addition, the heating weight change method is a method of heating a sample weighed with a precision balance or the like to sufficiently vaporize moisture, then measuring the weight again, and calculating the moisture content by Equation (1). The heating time varies depending on the size and condition of the sample, but is, for example, 2 minutes at 120°C.

For example, the water content of the polarization layer 30 can be reduced by performing an annealing treatment before attaching the polarization layer 30 to the wavelength conversion layer 32 or after attaching the polarization layer 30 to the wavelength conversion layer 32 . It is preferable to perform annealing in the temperature range of 100 degreeC or more and less than 150 degreeC. In addition, it is preferable to carry out the annealing treatment in a state where the polarization layer 30 is introduced into a vacuum chamber.

Specifically, for example, polyvinyl alcohol (PVA) is applied to a polyethyl terephthalate (PET) base material and immersed in hot water at 60° C. to swell. After that, in the same manner as above, it is dyed with an aqueous solution of a dichroic dye and stretched. After that, it is pasted on the counter substrate 34 on which the wavelength conversion layer 32 is formed using an ultraviolet curing resin so that the PVA side becomes the bonding surface. At this time, an annealing treatment is performed at 110° C. for 1 hour before or after pasting. After that, the PET substrate is peeled off leaving the dyed and stretched PVA.

Here, by annealing the polarization layer 30 before attaching it to the wavelength conversion layer 32, deterioration in characteristics of the wavelength conversion layer 32 or the like due to heating can be suppressed. On the other hand, by attaching the polarization layer 30 to the wavelength conversion layer 32 and then performing the annealing treatment, the barrier coating layer 28 or the common electrode 26 can be formed on the polarization layer 30 immediately after the annealing treatment. , it is possible to suppress re-entry of moisture into the polarization layer 30 after annealing.

Further, in the present embodiment, the moisture content was reduced by annealing the polarizing layer 30, but it is not limited to this, and any treatment capable of reducing the moisture content may be used. For example, it is good also as vacuum treatment which reduces the water|moisture content in the polarization layer 30 by drying by setting the inside of the vacuum chamber into which the polarization layer 30 was introduced into a vacuum state.

On the polarization layer 30, a barrier coating layer 28 is formed. The barrier coating layer 28 is a layer having a function of preventing moisture contained in the polarization layer 30 from reaching the common electrode 26 or the liquid crystal layer 22 . The barrier coating layer 28 is preferably disposed between the polarization layer 30 and the liquid crystal layer 22 . Further, when the common electrode 26 is provided between the polarization layer 30 and the liquid crystal layer 22, the barrier coating layer 28 is disposed between the polarization layer 30 and the common electrode 26. It is more preferable to The barrier coating layer 28 can be an organic layer, an inorganic layer, or a hybrid layer combining these.

In this way, by providing the barrier coating layer 28, it is difficult for moisture contained in the polarization layer 30 to reach the common electrode 26 or the liquid crystal layer 22, and the common electrode 26 or the liquid crystal layer caused by the moisture Deterioration of (22) can be suppressed.

The organic layer used as the barrier coating layer 28 preferably contains an acrylic material. The organic layer is advantageous in that it has better adhesion to the polarization layer 30 than the inorganic layer and is easy to process.

The acrylic resin layer can be constituted by curing a polymerizable resin composition containing at least a (meth)acrylate component and a photopolymerization initiator. The (meth)acrylate component contains (meth)acrylate (A) having a hydroxyl group, and optionally further contains (meth)acrylate (B) having three or more (meth)acrylate groups. In this embodiment, (meth)acrylate shall represent an acrylate and/or methacrylate. Similarly, the (meth)acryloyl group shall represent an acryloyl group and/or a methacryloyl group.

The total hydroxyl value of the (meth)acrylate component excluding the solvent is 100 to 200 mgKOH/g. By suppressing the hydroxyl value of the (meth)acrylate component in the polymerizable resin composition within this range, the adhesion and adhesiveness of the acrylic resin layer to the polarizing layer 30 can be improved. Since the acrylic resin layer has good adhesion to the polarization layer 30, it can impart excellent durability to the polarization layer 30. As long as the hydroxyl value of the entire (meth)acrylate component is within the above range, the (meth)acrylate component may further contain a (meth)acrylate compound having no hydroxyl group.

The hydroxyl value in terms of solid content of the polymerizable resin composition can be obtained by the following formula (2).

In the formula (2), the average molecular weight of the resin represents the average molecular weight of the (meth)acrylate mixture calculated from the molecular weight of each (meth)acrylate contained in the (meth)acrylate component and the compounding ratio. For example, when the (meth)acrylate component contains (meth)acrylate (A) of molecular weight MA in XA weight% and (meth)acrylate component (B) of molecular weight MB in XB weight%, of resin Average molecular weight M is represented by M=MA×XA/100+MB×XB/100. Also when the (meth)acrylate component contains other (meth)acrylates, the average molecular weight can be similarly calculated based on the compounding ratio.

As (meth)acrylate (A) containing a hydroxyl group, for example, EHC-modified butyl acrylate (Denacol DA-151, manufactured by Nagase Sangyo), glycerol methacrylate (Bremmer GLM, manufactured by Nichiyu Co., Ltd.), 2 -Hydroxy-3-methacryloxypropyltrimethylammonium chloride (Nichiyu Bremmer QA), EO-modified phosphoric acid acrylate (Kyoei Chemical Co., Ltd. Light Ester P-A), EO-modified phthalic acid acrylate (Osaka Yuki Co., Ltd. Biscott 2308) , EO, PO modified phthalic acid methacrylate (Kyoei Chemical Co., Ltd. Light Ester HO), acrylated isocyanurate (Toagosei Co., Ltd. Aronix M-215), EO modified bisphenol A diacrylate (Kyoei Chemical Co., Ltd. epoxy Ester 3000A), dipentaerythritol monohydroxypentaacrylate (SR-399 manufactured by Sartomer Co., Ltd.), glycerol dimethacrylate (Denacol DM-811 manufactured by Nagase Sangyo Co., Ltd.), glycerol acrylate (Bremmer GAM manufactured by Nichi Yuzu Co., Ltd.), glycerol Dimethacrylate (Bremmer GMR manufactured by Nichiyu), ECH modified glycerol triacrylate (Denacol DA-314 manufactured by Nagase Sangyo), ECH modified 1,6-hexanediol diacrylate (Kayarad R-167 manufactured by Nippon Kayaku) , pentaerythritol triacrylate (Kayarad PET-30 manufactured by Nippon Kayaku), stearic acid modified pentaelslitol diacrylate (Toagosei Aronix M-233), ECH modified phthalic acid diacrylate (Denacol DA manufactured by Nagase Sangyo) -721), triglycerol diacrylate (epoxy ester 80 MFA manufactured by Kyoeisha Chemical), 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl ( meta) acrylate; and the like.

Among these compounds, the (meth)acrylate (A) having a hydroxyl group is preferably a polyfunctional (meth)acrylate, and a (meth)acryl having three or more (meth)acryloyl groups in addition to the hydroxyl group. It is more preferable that it is rate. As the (meth)acrylate having three or more hydroxyl groups and (meth)acryloyl groups, pentaerythritol triacrylate (hydroxyl value = 188 mgKOH/g) and dipentaerythritol pentaacrylate (107 mgKOH/g) are preferable. .

The content of the (meth)acrylate (A) containing a hydroxyl group in the polymerizable resin composition is preferably 50 to 99% by weight, more preferably 70 to 99% by weight, in the solid content of the polymerizable resin composition.

The polymerizable resin composition may further contain (meth)acrylate (B) having three or more (meth)acryloyl groups. As the (meth)acrylate (B) having three or more (meth)acryloyl groups, for example, pentaerythritol triacrylate (Kayarad PET-30 manufactured by Nippon Kayaku), pentaerythritol tetraacrylate (Kaya manufactured by Nippon Kayaku) Lard PET-40), pentaerythritol tetramethacrylate (SR-367 manufactured by Sartomer), dipentaerythritol hexaacrylate (Kayarad DPHA manufactured by Nippon Kayaku), dipentaerythritol monohydroxypentaacrylate (SR-367 manufactured by Sartomer) 399), alkyl-modified dipentaerythritol pentaacrylate (Kayarad D-310 manufactured by Nippon Kayaku), alkyl-modified dipentaerythritol tetraacrylate (Kayarad D-320 manufactured by Nippon Kayaku), alkyl-modified dipentaerythritol triacrylate ( Nihon Kayaku Kayarad D-330), caprolactone-modified dipentaerythritol hexaacrylate (Nippon Kayaku Kayarad DPCA-20, Nihon Kayaku Kayarad DPCA-60, Nihon Kayaku Kayarad DPCA-120), trimethylol Propane triacrylate (Kayarad TMPTA manufactured by Nippon Kayaku), trimethylolpropane trimethacrylate (SR-350 manufactured by Sartomer), ditrimethylolpropane tetraacrylate (SR-355 manufactured by Sartomer), neopentyl glycol modified trimethylolpropane Diacrylate (Kayarad R-604 manufactured by Nippon Kayaku), EO modified trimethylolpropane triacrylate (SR-450 manufactured by Sartomer), PO modified trimethylolpropane triacrylate (Kayarad TPA-series manufactured by Nippon Kayaku) or ECH Modified trimethylolpropane triacrylate (Deconal DA-321 manufactured by Nagase Sangyo), tris(acryloxyethyl) isocyanurate (Aronix M315 manufactured by Toagosei Co., Ltd.), epichlorhydrin (ECH) modified glycerol tri(meth) Acrylates, ethylene oxide (EO) modified glycerol tri(meth)acrylate, propylene oxide (PO) modified glycerol tri(meth)acrylate, EO modified phosphoric acid tri(meth)acrylate, caprolactone modified trimethylolpropane tri(meth) )Acrylate, EO modified trimethylolpropane tri(meth)acrylate, PO modified trimethylolpropane tri(meth)acrylate, silicon hexa(meth)acrylate, diol and poly Polyfunctional urethane (meth)acrylate, which is a reaction product of polyisocyanate compound and polyfunctional (meth)acrylate having active hydrogen (hydroxyl group, amine, etc.) A rate etc. are mentioned.

The content of the (meth)acrylate (B) having three or more (meth)acryloyl groups in the polymerizable resin composition is preferably 50 to 99% by weight in the solid content of the polymerizable resin composition, more preferably 70 to 99% by weight.

It is preferable that the average value of the number of (meth)acryloyl groups in the whole (meth)acrylate component is 3-6. When the average number of (meth)acryloyl groups is within the above range, the hardness of the film is high, scratches are unlikely to occur during the coating process, and durability of the polarization layer 30 can be improved.

The (meth)acrylate component, as long as the hydroxyl value of the (meth)acryl component falls within the above range, (meth)acrylate (A) having a hydroxyl group and (meth)acryloyl group having three or more (meth)acryloyl groups. In addition to the acrylate (B), you may further contain other (meth)acrylates in an arbitrary ratio.

Examples of the photopolymerization initiator include benzoins such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, and benzoin isobutyl ether; Acetophenone, 2,2-diethoxy-2-phenylacetophenone, 1,1-dichloroacetophenone, 2-hydroxy-2-methyl-phenylpropan-1-one, diethoxyacetophenone, 1-hydroxycyclo acetophenones such as hexylphenyl ketone and 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one; anthraquinones such as 2-ethylanthraquinone, 2-t-butylanthraquinone, 2-chloroanthraquinone, and 2-amylanthraquinone; thioxanthone such as 2,4-diethylthioxanthone, 2-isopropylthioxanthone, and 2-chlorothioxanthone; ketals such as acetophenone dimethyl ketal and benzyl dimethyl ketal; benzophenones such as benzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, and 4,4'-bismethylaminobenzophenone; and phosphine oxides such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide. You may use these individually or in mixture of 2 or more types.

In the polymerizable resin composition, the content of the photopolymerization initiator is preferably 0.5 to 10% by weight, more preferably 1 to 7% by weight, based on the solid content of the polymerizable resin composition.

A photoinitiator can also be used together with a hardening accelerator. As a hardening accelerator which can be used together, for example, triethanolamine, diethanolamine, N-methyldiethanolamine, 2-methylaminoethyl benzoate, dimethylaminoacetophenone, p-dimethylaminobenzoic acid isoamino ester, EPA, etc. Hydrogen donors, such as amines and 2-mercaptobenzothiazole, are mentioned. The amount of the curing accelerator used is preferably 0 to 5% by weight in the solid content of the polymerizable resin composition.

Since the acrylic resin layer formed by curing the polymerizable resin composition has a hydroxyl group, adhesion to triacetyl cellulose is improved and adhesion to the polarizing layer 30 after saponification treatment is improved.

The inorganic layer used as the barrier coating layer 28 preferably contains silicon oxide (SiOx) or silicon nitride (SiNx). The inorganic layer can be formed into a film by a sputtering method, an atomic layer deposition method (ALD), or the like. The inorganic layer is advantageous in that the water transmittance can be reduced even if it is made thinner than the organic layer.

The hybrid layer has a structure in which an organic layer and an inorganic layer are laminated. By making the barrier coating layer 28 a hybrid layer, the effect of combining the effect of the organic layer and the effect of the inorganic layer can be obtained. Specifically, by forming an organic layer on the polarization layer 30 and then laminating an inorganic layer on the organic layer, the good adhesion between the organic layer and the polarization layer 30 and the high water resistance of the inorganic layer are combined, A function as the barrier coating layer 28 can be exhibited by the thin layer.

It is preferable that the thickness of the barrier coating layer 28 makes it difficult for moisture contained in the polarization layer 30 to reach the common electrode 26 or the liquid crystal layer 22 . On the other hand, if the barrier coating layer 28 is made too thick, color mixing between pixels tends to occur or efficiency decreases due to light absorption. Therefore, the film thickness of the barrier coating layer 28 is preferably 5 µm or less. More preferably, it is desirable to set it as 1 micrometer or less. For example, when the barrier coating layer 28 is made of an organic layer, the film thickness is preferably 0.5 μm or more and 5 μm or less. Further, for example, when the barrier coating layer 28 is made of an inorganic material, the film thickness is preferably 50 nm or more and 500 nm or less. Further, for example, when the barrier coating layer 28 is a hybrid layer, it is preferable to set the organic layer to 0.5 μm or more and 5 μm or less, and the inorganic layer to be 50 nm or more and 500 nm or less.

A common electrode 26 is formed on the barrier coating layer 28 . The common electrode 26 is, for example, a transparent electrode made of ITO (indium tin oxide) or the like.

On the common electrode 26, an alignment film 24 is formed. The alignment film 24 is made of a resin material such as polyimide. The alignment film 24 is cured by, for example, printing a 5 wt% solution of N-methyl-2-pyrrolidinone, which is a polyimide resin, on the common electrode 26 and heating at about 110°C to 280°C. After making it, it can form by orientation-processing by performing rubbing with a rubbing cloth. The alignment direction of the alignment film 24 is perpendicular to the alignment direction of the alignment film 20 .

In this case, it is also possible to use a photo-alignment layer, and a low-temperature process of 130° C. or less becomes easy when the photo-alignment layer is used. In the optical alignment, in order to improve viewing angle characteristics, the alignment direction may be changed in a region within one pixel by changing the irradiation direction of light to perform pixel division. Alignment processing such as rubbing and photo-alignment may not be performed, and the orientation direction may be determined by a gradient electric field by providing slits in either or both of the pixel electrode and the display electrode (Japanese Patent Laid-Open No. 05-222282). ). Alternatively, projections (Japanese Unexamined Patent Publication No. 06-104044) may be formed on either or both of the display electrode and the common electrode to control orientation.

In addition, the liquid crystal layer 22 is sealed between the alignment film 20 and the alignment film 24 so that the alignment film 20 and the alignment film 24 face each other. A spacer (not shown) is inserted between the alignment film 20 and the alignment film 24, liquid crystal is injected between the alignment film 20 and the alignment film 24, and the surroundings are sealed by a sealing material (not shown). The liquid crystal layer 22 is formed by sealing.

The alignment of the liquid crystal layer 22 is controlled by the alignment film 20 and the alignment film 24, and the initial alignment state of the liquid crystal in the liquid crystal layer 22 (when no electric field is applied) is the alignment film 20 and the alignment film 24. is determined by Then, by applying a voltage between the display electrode 18 and the common electrode 26, an electric field is generated between the display electrode 18 and the common electrode 26, thereby controlling the alignment of the liquid crystal layer 22. The transmission/non-transmission of light is controlled. Here, the liquid crystal layer 22 is made of a liquid crystal having negative dielectric anisotropy.

The backlight 36 includes a light source that outputs light. It is preferable to use LED as a light source, for example. The wavelength of light output from the backlight 36 is preferably light in a wavelength range that can be effectively used for wavelength conversion in the wavelength conversion layer 32 . For example, the backlight 36 is preferably a light source that outputs light in a wavelength range of 380 nm or more and 460 nm or less in peak wavelength, or a light source that outputs light in a wavelength range of 380 nm or less.

According to the liquid crystal display device 100, the use efficiency of light can be increased by converting the wavelength of light from the backlight 36 in the wavelength conversion layer 32 and using it. Accordingly, the energy efficiency of the liquid crystal display device 100 can be improved, and the liquid crystal display device 100 with low power consumption can be realized. Further, by applying a semiconductor layer having a quantum dot structure as the wavelength conversion layer 32, power consumption can be further reduced compared to the case of using a phosphor.

In addition, by adopting an in-cell structure in which the polarization layer 30 is formed between the counter substrate 34 and the liquid crystal layer 22, the wavelength conversion layer 32 is also formed between the counter substrate 34 and the liquid crystal layer 22. It becomes possible to provide between the light emitting body and the distance between the display electrode 18 and the TFT substrate 14 can be made shorter than before. For example, the counter substrate 34 has a thickness of about 500 μm, compared to the case where the polarization layer 30 is formed between the counter substrate 34 and the backlight 36. The wavelength conversion layer 32 can be brought closer to the display electrode 18 as much as possible. In this way, it is possible to reduce the margin of distance between pixels for avoiding color mixing between pixels. Accordingly, a high-resolution liquid crystal display device 100 can be provided.

In addition, it is preferable to increase the transmittance of light in a wavelength region of 460 nm or less from the polarizing plate 10 on the light incident side to just before the wavelength conversion layer 32 (the polarizing layer 30 in FIG. 1). Specifically, the transmittance of at least one of the wavelength ranges of 380 nm or less from the polarizing plate 10 immediately before the wavelength conversion layer 32 (polarization layer 30 in FIG. 1) is 1% or more, 380 nm to 380 nm It is preferable that the transmittance of at least one of the 400 nm wavelength range is 3% or more and the transmittance of at least one of the 400 nm to 430 nm wavelength range is 5% or more. In order to achieve such a transmittance, it is preferable to set it as the following structure.

It is preferable that the polarizing plate 10 has a high transmittance of light in a wavelength range of 460 nm or less. Specifically, the transmittance of at least any region of the wavelength range of 380 nm or less of the polarizing plate 10 is 1% or more, and the transmittance of at least any region of the wavelength range of 380 nm to 400 nm is 3% or more, 400 nm to 430 nm. It is preferable that the transmittance of at least one of the wavelength regions of 5% or more satisfies at least one condition.

In addition, it is preferable that the polarization layer 30 has a high transmittance of light in a wavelength region of 460 nm or less. Specifically, the transmittance of at least any region of the wavelength range of 380 nm or less of the polarization layer 30 is 1% or more, the transmittance of at least any region of the wavelength range of 380 nm to 400 nm is 3% or more, 400 nm to 430 nm. It is preferable that the transmittance of at least one of the nm wavelength region satisfies at least one condition of 5% or more.

In order to increase the transmittance of light in the wavelength range of 460 nm or less of the polarizing plate 10, the addition amount of the absorber for light in the wavelength range of 460 nm or less may be reduced. Usually, since TAC, which is a base material of the polarizing plate 10, contains an absorber for a short wavelength region such as an ultraviolet absorber, the transmittance of light in the wavelength region of 460 nm or less can be increased by reducing the absorber.

In addition, it is preferable to increase the transmittance of light in a wavelength region of 460 nm or less by thinning the film thickness of the alignment film 20 and/or the alignment film 24 . It is preferable to set it as 50 nm or less, and, as for the film thickness of the alignment film 20 and/or the alignment film 24, it is more preferable to set it as 5 nm or less. Accordingly, absorption of light in the wavelength range of 460 nm or less in the alignment film 20 and/or the alignment film 24 can be suppressed, and the transmittance in the wavelength range can be increased.

In addition, it is preferable to increase the transmittance of light in the wavelength region of 460 nm or less by thinning the liquid crystal layer 22 . The thickness of the liquid crystal layer 22 is preferably 4 μm or less, more preferably 3 μm or less, and even more preferably 2 μm or less. At this time, in order to set the retardation in the liquid crystal layer 22 to a desirable value, it is preferable to adjust the refractive index (Δn) of the liquid crystal layer 22 according to the film thickness of the liquid crystal layer 22 . For example, in order to set the retardation to 0.4 μm, when the thickness of the liquid crystal layer 22 is 4 μm, the refractive index (Δn) is 0.1, and when the thickness of the liquid crystal layer 22 is 3 μm, the refractive index ( When Δn) is set to 0.15 and the thickness of the liquid crystal layer 22 is set to 2 μm, the refractive index (Δn) may be set to 0.2.

The interlayer insulating film 16 is usually a UV curable organic film of 1 to 2 µm, but preferably has a film thickness of 1 µm or less, and more preferably 0.5 µm or less. In addition, it is good also as a structure which does not provide the interlayer insulating film 16. Accordingly, transmittance of light in a short wavelength region of 460 nm or less can be increased.

In addition, it is preferable that the interlayer insulating film 16 is made of an inorganic film and its film thickness is 0.5 μm or less. For example, the interlayer insulating film 16 may be made of a silicon oxide film (SiO ₂ film) and the film thickness may be 100 nm. Accordingly, transmittance of light in a short wavelength region of 460 nm or less can be increased.

Further, the thickness of the TFT substrate 14 is preferably 500 μm or less, and more preferably 200 μm or less. Further, as the TFT substrate 14, it is also preferable to use borosilicate glass, quartz glass, sapphire glass, or the like with few impurities. Accordingly, transmittance of light in a wavelength range of 460 nm or less can be increased.

In addition, the display electrode 18 preferably has a film thickness of 50 nm or less, more preferably 20 nm or less. In addition, the common electrode 26 preferably has a film thickness of 50 nm or less, more preferably 20 nm or less. Accordingly, transmittance of light in a wavelength range of 460 nm or less can be increased.

Further, although different from the structure shown in Fig. 1, it is also preferable to apply a structure of a TFT substrate in which an interlayer insulating film 16 is not provided in order to improve the transmittance of light of 460 nm or less. In this case, although the effective display area (or aperture ratio) contributing to display within the pixel pixel is reduced, this method may be employed in the case where the efficiency of using external light is higher than that.

In addition, these structures for increasing the transmittance of light in the wavelength range of 460 nm or less may be employed singly or in combination.

In this way, by increasing the transmittance of light in the wavelength region of 460 nm or less from the polarizing plate 10 on the light incident side to the wavelength conversion layer 32, the short wavelength component of external light incident from the polarizing plate 10 side is converted to the wavelength conversion layer ( 32), it is possible to efficiently utilize light emission by external light. As a result, the liquid crystal display device 100 has high contrast and excellent visibility even under external light such as outdoors.

<Second Embodiment>

Although the liquid crystal display device 200 in the first embodiment has a configuration of a VA (vertical alignment) type liquid crystal display device, the scope of application of the present invention is not limited thereto. In the second embodiment, the configuration of an IPS (transverse electric field switching) type liquid crystal display device will be described.

As shown in the cross-sectional schematic diagram of FIG. 2 , the liquid crystal display device 200 in the second embodiment includes a polarizing plate 10, an optical compensation layer 12, a TFT substrate 14, an interlayer insulating film 16, a display electrode 18, second interlayer insulating film 16a, common electrode 26a, alignment film 20a, liquid crystal layer 22a, alignment film 24a, barrier coating layer 28, polarization layer 30, wavelength conversion layer (32), a counter substrate (34) and a backlight (36).

The alignment films 20a and 24a are alignment films oriented in a direction close to parallel to the counter substrate 34, and are subjected to alignment treatment by rubbing or photo-alignment. The alignment process is performed so that the orientation films 20a and 24a are parallel to each other in the orientation direction. In optical alignment, since the pretilt angle disappears and the viewing angle characteristic improves, it is more preferable. The liquid crystal layer 22a has a positive or negative dielectric anisotropy. When the permittivity is positive, there are advantages such as good response characteristics at low temperatures and resistance to the influence of moisture. Further, when the dielectric constant anisotropy is negative, since the liquid crystal layer 22a is controlled to be substantially completely parallel to the counter substrate 34 when voltage is applied, an improvement in transmittance is expected.

In the IPS type liquid crystal display device 200, an electric field directed in the in-plane direction of the liquid crystal layer 22a is generated by applying a voltage to the common electrode 26a, and liquid crystal molecules laid horizontally are rotated in the horizontal direction to adjust the amount of light. Control. At this time, since the inclination of the liquid crystal molecules in the vertical direction does not occur, luminance change or color change due to the viewing angle can be reduced.

Also in this embodiment, by suppressing the moisture content of the polarization layer 30 to a low level, it is difficult for moisture contained in the polarization layer 30 to reach the common electrode 26a or the liquid crystal layer 22a, and the common electrode caused by moisture Deterioration of (26a) or the liquid crystal layer 22a can be suppressed. In addition, by providing the barrier coating layer 28, it is difficult for moisture contained in the polarization layer 30 to reach the common electrode 26a or the liquid crystal layer 22a, and the common electrode 26a or the liquid crystal layer ( Deterioration of 22a) can be suppressed.

In addition, by increasing the transmittance of light in the wavelength range of 460 nm or less from the polarizing plate 10 on the light incident side to the wavelength conversion layer 32, even when the IPS type liquid crystal display device 200 is used, the first embodiment Similarly, it is possible to provide a new liquid crystal display device having improved visibility under outdoor light without lowering visibility in a dark place.

Here, it is preferable to use an inorganic film having a film thickness of 500 nm or less, for example, a silicon oxide film (SiO ₂ film) for the second interlayer insulating film 16a. Accordingly, transmittance of light in a short wavelength region of 460 nm or less can be increased.

In addition, the common electrode 26a preferably has a film thickness of 50 nm or less, more preferably 20 nm or less. Accordingly, transmittance of light in a short wavelength region of 460 nm or less can be increased.

In addition, it is not necessary to provide all of the polarization layer 30 with reduced water content, the barrier coating layer 28, and each layer with increased transmittance in the short wavelength region shown in the first and second embodiments. may apply.

<Example of modification>

As the backlight 36, when the aforementioned blue light source is used, as the wavelength conversion layer 32, an absorption type color filter that absorbs light with a longer wavelength than blue is generally used for the blue (B) wavelength region, , For the green (G) wavelength region, a wavelength conversion material that converts incident light into light in the green wavelength region and outputs it, and for the red (R) wavelength region, converts incident light into light in the red wavelength region It uses a wavelength conversion material that outputs.

At this time, the green (G) wavelength conversion material can convert light with a wavelength shorter than the green wavelength range to green, but cannot convert light with a wavelength longer than the green wavelength range to green. Therefore, as shown in FIG. 3 , the light in the red wavelength region transmitted through the wavelength conversion layer 32 due to the incidence of external light or the like is reflected from the light guide plate or the reflector on the back side of the light guide plate, and the green (G) wavelength conversion material When entering the area, there is a risk that light in the red wavelength range is mixed with the green (G) display area.

Therefore, in this modified example, as shown in FIG. 4 , in the green (G) region of the wavelength conversion layer 32, the green wavelength conversion material 32a and the color filter that absorbs light in the red wavelength region ( 32b) has an overlapping configuration. Fig. 10 shows an example of a color filter 32b that absorbs light in a red wavelength region.

Accordingly, even if light in the red wavelength region is mixed in the green (G) region of the wavelength conversion layer 32, it is absorbed by the color filter 32b and its influence on the viewing side can be prevented.

In addition, instead of providing the color filter 32b, as shown in FIG. 5 , a dye that absorbs red in the green wavelength conversion material 32a in the green (G) region of the wavelength conversion layer 32 (40) may be mixed.

In the case of using the aforementioned UV light source as the backlight, as the wavelength conversion layer 32, a wavelength conversion material that converts incident light into light in the blue wavelength region and outputs it even in the blue (B) wavelength region is used, For the green (G) wavelength range, a wavelength conversion material is used that converts incident light into light in the green wavelength range and outputs it. For the red (R) wavelength range, incident light is converted into light in the red wavelength range and output. A configuration using a wavelength conversion material to be used is also employed.

At this time, the blue (B) and green (G) wavelength conversion materials can wavelength-convert light with a shorter wavelength than the blue and green wavelength ranges, respectively, but can convert light with a wavelength longer than the blue and green wavelength ranges. cannot be converted Therefore, the light in the green and red wavelength regions transmitted through the wavelength conversion material region of the wavelength conversion layer 32 is reflected from the light guide plate or the reflector on the back side of the light guide plate by the incident of external light, etc., resulting in blue (B) or green (G ), there is a possibility that light in the green and red or red wavelength regions may be mixed in the blue (B) and green (G) regions, respectively.

Therefore, in this modified example, as shown in FIG. 6, in the blue (B) region of the wavelength conversion layer 32, the blue wavelength conversion material 32c and the color that absorbs light in the green and red wavelength regions The filter (blue color filter) 32d is overlapped. Further, in the green (G) region of the wavelength conversion layer 32, a green wavelength conversion material 32a and a color filter 32b absorbing light in a red wavelength region are overlapped. Fig. 11 shows an example of a color filter 32d that absorbs light in the green and red wavelength ranges.

Accordingly, even if light in the red wavelength region is mixed in the blue (B) and green (G) regions of the wavelength conversion layer 32, it is absorbed by the color filters 32d and 32b, and its influence can be prevented.

In addition, instead of providing color filters 32b and 32d, as shown in FIG. 7 , in the blue (B) and green (G) regions of the wavelength conversion layer 32, each blue wavelength conversion material ( In 32c), a dye 41 that absorbs green and red colors (blue dye) and a dye 40 that absorbs red light may be mixed with the green wavelength conversion material 32a.

This modified example can also be adopted for a method of increasing the light utilization efficiency by using the returned light by the reflective polarizer described in the present invention, thereby preventing color mixing in the case of using the reflective polarizer.

For example, as shown in FIG. 8 , when the aforementioned blue light source is used as the backlight, the wavelength conversion layer 32 generally absorbs light with a longer wavelength than blue in the blue (B) wavelength region. A wavelength conversion material 32a that converts incident light into light in the green wavelength region and outputs light in the green (G) wavelength region and a color filter that absorbs light in the red wavelength region ( 32b) has an overlapping configuration.

Accordingly, even if the red light reflected in the polarization layer 30 is mixed in the green (G) region of the wavelength conversion layer 32, it is absorbed by the color filter 32b, and its influence on the viewing side can prevent

Further, for example, as shown in FIG. 9 , in the case of using the aforementioned UV light source as the backlight, as the wavelength conversion layer 32, the wavelength of blue in the blue (B) region of the wavelength conversion layer 32 A conversion material 32c and a color filter (blue color filter) 32d absorbing light in the green and red wavelength ranges are overlapped. Further, in the green (G) region of the wavelength conversion layer 32, a green wavelength conversion material 32a and a color filter 32b absorbing light in a red wavelength region are overlapped.

Accordingly, even if the light in the red wavelength region reflected in the polarization layer 30 is mixed in the blue (B) and green (G) regions of the wavelength conversion layer 32, the color filter 32d and the color filter ( 32b), and can prevent its influence on the viewing side.

In addition, even when a reflective polarizer is used, instead of providing color filters 32b and 32d, in the blue (B) and green (G) regions of the wavelength conversion layer 32, each blue wavelength conversion material ( 32c) may be mixed with a dye absorbing green and red (blue dye) and a dye absorbing red in the green wavelength conversion material 32a.

Claims (14)

As a liquid crystal display device,
A wavelength conversion layer for outputting wavelength-converted light;
A polarization layer disposed between the wavelength conversion layer and the liquid crystal layer,
The polarization layer 30 includes a dye-type polarizing element in which dyeing is performed with a dichroic dye on a PVA (polyvinyl alcohol)-based resin,
A barrier coating layer is provided between the polarization layer and the liquid crystal layer to suppress the transmission of moisture,
The barrier coating layer comprises an acrylic resin layer formed by curing a polymerizable resin composition containing a (meth)acrylate component having a hydroxyl group. delete delete delete delete According to claim 1,
The liquid crystal display device, characterized in that the film thickness of the barrier coating layer is 5 μm or less. According to claim 1,
more backlights,
The liquid crystal display device according to claim 1 , wherein the wavelength conversion layer receives light from the backlight and converts the wavelength, and the liquid crystal layer is arranged on a viewing side of the wavelength conversion layer. As a polarizing element,
It is used in a liquid crystal display device having a wavelength conversion layer that outputs wavelength-converted light,
A polarizing layer disposed between the wavelength conversion layer and the liquid crystal layer and including a dye-type polarizing element in which a PVA (polyvinyl alcohol)-based resin is dyed with a dichroic dye, and the polarizing layer and the liquid crystal layer It is disposed between and has a barrier coating layer for suppressing the permeation of moisture,
The barrier coating layer comprises an acrylic resin layer formed by curing a polymerizable resin composition containing a (meth)acrylate component having a hydroxyl group. delete delete delete A method for manufacturing the liquid crystal display device according to claim 1,
A manufacturing method characterized by forming the polarization layer by attaching it to a substrate after annealing. A method for manufacturing the liquid crystal display device according to claim 1,
A manufacturing method characterized in that the polarizing layer is formed by annealing after attaching to a substrate. delete

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