KR20200002926A - Liquid crystal display - Google Patents

Abstract

A backlight, a wavelength conversion layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength conversion layer, and a polarizing layer disposed between the wavelength conversion layer and the liquid crystal layer. In the liquid crystal display device, the transmittance of the wavelength region of 380 nm or less of the polarizing layer is 1% or more, the transmittance of the wavelength region of 380 nm to 400 nm is 3% or more and the transmittance of the wavelength region of 400 nm to 430 nm is 5%. It is more than%.

Description

Liquid crystal display

The present invention relates to a liquid crystal display device.

In recent years, display apparatuses, such as a liquid crystal display device and an organic electroluminescent display device, have become popular. A general liquid crystal display device is a non-light-emitting display device, and light-modulates light from a backlight having a white LED or the like as a light source for each pixel in the liquid crystal layer, thereby providing a red (R), green (G), and blue (B) angle. Color display is performed through the color filter layer. White LED has the characteristics such as good luminous efficiency and long life. On the other hand, a white LED has large light loss by the fall (so-called temperature quenching) of the luminous efficiency of fluorescent substance by heat generation. In addition, because of the structure of separating the light from the white LED 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.

Moreover, the liquid crystal display device of the form which uses an ultraviolet light source as a backlight and makes this fluorescent light source an excitation light, emits the fluorescent layers of each of red, green, and blue colors. In addition, a blue LED is used as a backlight, and blue and green light emitted from the blue LED are used to emit red and green phosphor layers to obtain red and green light, and blue light from the blue LED is transmitted as it is. Disclosed is a liquid crystal display device in a form of displaying.

Moreover, a pair of board | substrates with which the liquid crystal layer was clamped, the light emitting diode which emits the light of the range of the peak wavelength of 380 nm-420 nm arrange | positioned at the back surface of one side of a pair of board | substrate, and the other side of a pair of board | substrate A phosphor having a formed polarizing plate and absorbing light having a peak wavelength in a range of 380 nm to 420 nm for each unit pixel on the opposite side to the liquid crystal layer of the polarizing plate formed on the other side of the pair of substrates to emit light of a predetermined color; A liquid crystal display device having a subpixel having a layer and having a filter layer for reflecting or absorbing light having a wavelength of 420 nm or less on a surface opposite to the liquid crystal layer of the phosphor layer is disclosed.

By the way, there is a problem that neither display device has sufficient visibility under external light. Although a reflective liquid crystal display device has been proposed as a display device having high visibility under external light, there is a problem that visibility is low in a dark place.

Therefore, an object of this invention is to provide the new liquid crystal display device which improved visibility under external light, without reducing visibility in the dark place.

One aspect of the present invention is a backlight, a wavelength conversion layer for outputting light wavelength-converted by receiving light from the backlight, a liquid crystal layer disposed closer to the viewer side than the wavelength conversion layer, the wavelength conversion layer and the A liquid crystal display device comprising a polarizing layer disposed between a liquid crystal layer and a polarizing plate disposed on the viewing side of the liquid crystal layer, wherein at least any one of a wavelength region of 380 nm or less between the polarizing plate and the wavelength conversion layer. The transmittance of at least one of the wavelength ranges of 1% or more, the wavelength range of 380 nm to 400 nm is at least 3%, and the transmittance of at least any of the wavelength ranges of 400 nm to 430 nm is 5% or more. It is a liquid crystal display device characterized by the above-mentioned.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. A liquid crystal display device comprising a polarizing layer disposed between layers and a polarizing plate disposed on the viewing side of the liquid crystal layer, wherein transmittance of at least one of the 380 nm or less wavelength ranges of the polarizing plate is 1% or more and 380. 3% or more of the transmittance of at least any of the wavelength ranges of nm to 400 nm and at least one of the wavelength ranges of 400 nm to 430 nm satisfy at least one condition of at least 5%. to be.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. A liquid crystal display device comprising a polarizing layer disposed between layers and a polarizing plate disposed on the viewing side of the liquid crystal layer, wherein at least one of transmittances in a wavelength region of 380 nm or less of the polarizing layer is 1% or more, 3% or more of the transmittance of at least any of the wavelength ranges of 380 nm to 400 nm, and the transmittance of at least any of the wavelength ranges of 400 nm to 430 nm satisfy at least one condition of 5% or more. Device.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. A liquid crystal display device comprising a polarizing layer disposed between layers and a polarizing plate disposed on the viewing side of the liquid crystal layer, the liquid crystal display device comprising: two alignment layers having the liquid crystal layer interposed therebetween, and at least one of the alignment layers. The film thickness is 50 nm or less, The liquid crystal display device characterized by the above-mentioned.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. It is a liquid crystal display device provided with the polarizing layer arrange | positioned between layers, and the polarizing plate arrange | positioned rather than the said liquid crystal layer at the visual recognition side, The thickness of the said liquid crystal layer is a liquid crystal display device characterized by the above-mentioned.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. A liquid crystal display device comprising a polarizing layer disposed between layers and a polarizing plate disposed on the viewing side of the liquid crystal layer, wherein the interlayer insulating film in the TFT substrate for controlling the liquid crystal layer is an organic film. Thickness is 1 micrometer or less, It is a liquid crystal display device characterized by the above-mentioned.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. A liquid crystal display device comprising a polarizing layer disposed between layers and a polarizing plate disposed on the viewing side of the liquid crystal layer, wherein an interlayer insulating film is not provided in a TFT substrate for controlling the liquid crystal layer. It is a liquid crystal display device.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. A liquid crystal display device comprising a polarizing layer disposed between layers and a polarizing plate disposed on the viewing side than the liquid crystal layer, wherein the substrate provided on the viewing side has a thickness of 500 μm or less. .

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. A liquid crystal display device comprising a polarizing layer disposed between layers and a polarizing plate disposed on the viewing side of the liquid crystal layer, wherein the display electrode is 50 nm or less in thickness.

Here, as for the said display electrode, it is more preferable that the thickness is 20 nm or less.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. A liquid crystal display device comprising a polarizing layer disposed between layers and a polarizing plate disposed on the viewing side of the liquid crystal layer, wherein the common electrode is 50 nm or less in thickness.

Here, as for the said common electrode, it is more preferable that the thickness is 20 nm or less.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. A liquid crystal display device comprising a polarizing layer disposed between layers and a polarizing plate disposed on the viewing side of the liquid crystal layer, wherein the liquid crystal portion including the liquid crystal layer is a transverse electric field system, and the common electrode and the display electrode The interlayer insulation film between the layers is 500 nm or less, which is a liquid crystal display device.

Here, as for the said interlayer insulation film, it is more preferable that the thickness is 200 nm or less.

According to another aspect of the present invention, there is provided a backlight, a wavelength converting layer that receives light from the backlight and outputs wavelength-converted light, a liquid crystal layer disposed closer to the viewer than the wavelength converting layer, the wavelength converting layer, and the liquid crystal. The polarizing plate used for the liquid crystal display device provided with the polarizing layer arrange | positioned between layers, and the polarizing plate arrange | positioned rather than the said liquid crystal layer, The transmittance | permeability of at least any area | region of 380 nm or less wavelength range is 1% or more. At least one of the wavelength ranges of 380 nm to 400 nm has a transmittance of at least 3%, and at least one of the wavelength ranges of 400 nm to 430 nm satisfies at least one condition of at least 5%. to be.

According to the present invention, it is possible to provide a new liquid crystal display device in which visibility in external light is also increased without lowering visibility in a dark place.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the liquid crystal display device in 1st Embodiment.
It is a figure which shows the structure of the liquid crystal display device in 2nd Embodiment.
3 is a view for explaining the problem of the conventional wavelength conversion layer.
4 is a diagram illustrating a configuration of a wavelength conversion layer in a modification.
5 is a diagram illustrating a configuration of a wavelength conversion layer in a modification.
6 is a diagram illustrating a configuration of a wavelength conversion layer in a modification.
It is a figure which shows the structure of the wavelength conversion layer in a modification.
8 is a diagram illustrating a configuration of a wavelength conversion layer in a modification.
9 is a diagram illustrating a configuration of a wavelength conversion layer in a modification.
It is a figure which shows the example of the transmittance | permeability of the color filter which absorbs the light of a red wavelength range.
It is a figure which shows the example of the transmittance | permeability of the color filter which absorbs the light of red and green wavelength range.

<1st embodiment>

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

As shown by the arrow, the liquid crystal display device 100 functions as a device that receives light from the backlight 36 and outputs light converted by the wavelength conversion layer 32 from the polarizing plate 10 side to display an image. do. In addition, the liquid crystal display device 100 may actively convert the external light into the wavelength conversion layer 32 and output the wavelength by using the external light incident from the polarizing plate 10 side. 1 is a schematic diagram, and the magnitude | size and thickness of each component do not reflect the actual value.

In the present embodiment, the active matrix liquid crystal display device is described as the liquid crystal display device 100 by way of example, but the scope of application of the present invention is not limited thereto, and the present invention is also applicable to liquid crystal display devices of other aspects such as a simple matrix type. Do.

The TFT substrate 14 is configured by arranging TFTs on a substrate for each pixel. The substrate is a transparent substrate such as glass. The substrate is used for mechanically supporting the liquid crystal display device 100 and for displaying an image through light. 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 the gate line is disposed in the lower portion (on the substrate) in the middle of the TFT. 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, and a portion of the source region immediately above the gate electrode 14a becomes a channel region with almost no impurities, and both sides are electrically conductive by impurity doping. And a drain region. A contact hole is formed on the drain region of the TFT, a drain electrode of metal (for example, aluminum) is disposed therein (electrically connected), and a contact hole is formed on the source region, and a metal (eg, 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.

The polarizing plate 10 is formed on the surface of the TFT substrate 14 where the TFT is not formed. The polarizing plate 10 is formed to cover the surface of the substrate of the TFT substrate 14. It is preferable that the polarizing plate 10 contains the dye-based polarizing element by which the PVA (polyvinyl alcohol) type resin was dyed with an iodine type material or a dichroic dye.

On the surface of the TFT substrate 14 where the TFT is formed, the display electrode 18 is provided via the interlayer insulating film 16. The display electrodes 18 are individual electrodes separated for each pixel, and are transparent electrodes made of, for example, 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 is formed to cover the display electrode 18 and to align the liquid crystals vertically. The alignment film 20 is made of a resin material such as polyimide. For example, the alignment film 20 prints a 5 wt% solution of N-methyl-2-pyrrolidinone, which becomes a polyimide resin, on the display electrode 18, and cures by heating at about 180 ° C. to 280 ° C. After making it rub, it can be formed by carrying out the orientation treatment by rubbing with a rubbing cloth.

Next, the structure and the manufacturing method of the opposing board | substrate 34 side are demonstrated. The opposing substrate 34 is a transparent substrate such as glass. The opposing substrate 34 is used to mechanically support the liquid crystal display device 100 and transmit the 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 opposing substrate 34, the wavelength conversion layer 32 is formed. The wavelength conversion layer 32 is arrange | positioned in matrix form in the in-plane direction of the opposing board | substrate 34 for every 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 to be described later and emits light in a specific wavelength region can be used.

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

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

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

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 in three dimensions or a quantum rod periodically arranged in two dimensions. A quantum dot or a quantum rod is formed by repeatedly disposing semiconductor materials having different bad gaps in a period of nm order, thereby functioning as a material having a desired band gap, and receiving light from the backlight 36 to a wavelength region along the band gap. Can be used as the wavelength conversion layer 32 which emits light. Specifically, a quantum dot structure or a quantum rod structure having a characteristic of absorbing light in the wavelength region of the output light of the backlight 36 and emitting one of red (R), green (G), and blue (B) light To form.

For example, the quantum dot may have a structure in which a central core (core) is formed of cadmium selenide (CdSe), and a coating layer (shell) of zinc sulfide (ZnS) is covered on the outside thereof. The emission color can be controlled by changing this diameter. For example, when red (R) emits light, the diameter is 8.3 nm, and when green (G) emits light, the diameter is 3 nm, and when blue (B) emits light, the diameter may be made smaller. As the core material, indium phosphide (InP), indium sulfide copper (CuInS 2), carbon, graphene, or the like may be used.

The wavelength conversion layer is a phosphor or a quantum dot or a quantum rod that emits red (R), green (G), and blue (B), and is formed and disposed by a patterning process at a location corresponding to the display electrode to display full color. Becomes possible. The patterning process disperses a phosphor material or a quantum dot material or a quantum rod material that emits red (R), green (G), and blue (B) into the photosensitive polymer, and the dispersion is coated on the substrate 34 by a coater. It is realized by coating, forming and exposing and developing. You may form a black matrix between each color in order to prevent the mixed color between display pixels.

On the wavelength conversion layer 32, the polarizing layer 30 is formed. It is preferable that the polarizing layer 30 contains the polarizing element of the dyeing system by which the PVA (polyvinyl alcohol) type resin was dyed with the dichroic dye. Here, it is preferable that a dye type material contains an azo compound and / or its salt.

That is, it is preferable to use the dye type material which satisfy | fills following formula.

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

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

(3) The azo compound as described in (1) whose R1 and R2 are hydrogen atoms, and its salt.

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 it melt | dissolves with sodium hydroxide. The obtained material is cooled, 32 parts of 35% hydrochloric acid is added at 10 degrees C or less, 6.9 parts of sodium acetate are added, and it stirred at 5-10 degreeC for 1 hour. 20.9 parts of aniline-ω-methanesulfonic acid soda are added there, sodium carbonate is added and it is made to pH 3.5, stirring at 20-30 degreeC. The mixture is stirred to complete the coupling reaction and filtered to obtain a mono azo compound. The obtained mono azo compound is stirred at 90 degreeC in presence of sodium hydroxide, and 17 parts of mono azo compounds of General formula (2) are obtained.

After dissolving 12 parts of mono azo compound of general 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 condensation reaction is carried out at 90 degreeC. Subsequently, after reducing to 9 parts of glucose, salting with sodium chloride, it filtered and obtained 16 parts of azo compounds represented by General formula (3).

In addition, 0.01% of dye of Compound (3), 0.01% of C.I.Direct Red 81, 0.03% of dye represented by the following structural formula (4) shown in Example 1 of Japanese Patent No. 2622748, Japan Polyvinyl alcohol having a thickness of 75 μm as a substrate in an aqueous solution at 45 ° C. at a concentration of 0.03% of dye represented by the following structural formula (5) and 0.1% of forget-me-not shown in Example 23 of Japanese Patent Application Laid-Open No. 60-156759 Soak (PVA) for 4 minutes. This film is extended | stretched 5 times at 50 degreeC in 3% boric-acid aqueous solution, and it washes with water and dries, maintaining a tension state. Thereby, the dye system material which becomes neutral color (gray in a parallel position and black in an orthogonal position) can be obtained.

A normal polarizing element is an iodine type polarizing element formed from the material dyed by iodine and an iodine compound in resin. However, iodine and iodine compounds are weak to heat and deteriorate by heating at about 100 ° C. On the other hand, a polarizing element using a dye (dichroic dye) is relatively heat resistant and can prevent deterioration if it is heated at about 130 ° C. Therefore, the polarizing layer 30 can be formed between the opposing substrate 34 and the alignment film 24 without being affected by the film formation temperature during formation of the alignment film 24 and the common electrode 26 described later. Become.

The water content of the polarizing layer 30 is preferably 3% or less, preferably 1% or less, and more preferably 0.1% or less. That is, by lowering the moisture content of the polarizing layer 30, the moisture contained in the polarizing layer 30 can hardly reach the common electrode 26 or the liquid crystal layer 22.

Thus, by suppressing the water content of the polarizing layer 30 low, it is difficult for the water contained in the polarizing layer 30 to reach the common electrode 26 or the liquid crystal layer 22, and the common electrode 26 by the moisture And deterioration of the liquid crystal layer 22 can be suppressed.

In addition, a water content is shown as (total weight of the moisture weight / polarizing layer 30 in polarizing layer 30) x 100 (%). The 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 attaching and using a water vaporization device (VA200 type) in a water measuring device (CA-200 type or KF-200 type) manufactured by Mitsubishi Chemical Analyzer.

In addition, the heating weight change method is a method of heating the sample which measured the weight by precision balance etc., after vaporizing enough moisture and measuring a weight again, and calculating moisture content by Formula (1). The heating time varies depending on the size, state, and the like of the sample, but is, for example, 2 minutes at 120 ° C.

For example, the water content of the polarizing layer 30 can be reduced by annealing before attaching the polarizing layer 30 to the wavelength converting layer 32 or after pasting the wavelength converting layer 32. It is preferable to perform annealing treatment in the temperature range of 100 degreeC or more and less than 150 degreeC. Moreover, it is preferable to carry out in the state which introduce | transduced the polarizing layer 30 in the vacuum chamber at the time of annealing.

Specifically, for example, polyvinyl alcohol (PVA) is applied to a polyethyl terephthalate (PET) substrate, immersed in hot water at 60 ° C and swelled. Then, it dyes and extends by the aqueous solution of a dichroic dye similarly to the above. Subsequently, the PVA side is pasted onto the opposing substrate 34 on which the wavelength conversion layer 32 is formed by using an ultraviolet curable resin. At this time, annealing treatment is performed at 110 ° C for 1 hour before or after pasting. Thereafter, the PET substrate is peeled off, leaving dyed and stretched PVA.

Here, by annealing before attaching the polarizing layer 30 to the wavelength conversion layer 32, the fall of the characteristic of the wavelength conversion layer 32 etc. can be suppressed by heating. On the other hand, by attaching the polarization layer 30 to the wavelength conversion layer 32 and then performing annealing, the barrier coating layer 28 or the common electrode 26 can be formed on the polarization layer 30 immediately after the annealing treatment. After annealing, moisture can be restrained from entering the polarizing layer 30 again.

In addition, in this embodiment, although the moisture content was reduced by performing an annealing process with respect to the polarizing layer 30, it is not limited to this, What is necessary is just a process which can reduce water content. For example, it is good also as a vacuum process which dries by making the inside of the vacuum chamber which introduce | transduced the polarizing layer 30 into a vacuum state, and reduces the moisture in the polarizing layer 30. FIG.

On the polarizing layer 30, a barrier coating layer 28 is formed. The barrier coating layer 28 is a layer having a function of making it difficult for moisture contained in the polarizing layer 30 to reach the common electrode 26 or the liquid crystal layer 22. The barrier coating layer 28 is preferably disposed between the polarizing layer 30 and the liquid crystal layer 22. In addition, when the common electrode 26 is provided between the polarizing layer 30 and the liquid crystal layer 22, the barrier coating layer 28 is disposed between the polarizing layer 30 and the common electrode 26. It is more preferable to do. The barrier coating layer 28 can be an organic layer, an inorganic layer, or a hybrid layer combining these.

Thus, by providing the barrier coating layer 28, it is difficult for the water contained in the polarizing layer 30 to reach the common electrode 26 or the liquid crystal layer 22, and the common electrode 26 or the liquid crystal layer due to moisture is difficult to reach. Deterioration of (22) can be suppressed.

It is preferable that the organic layer used as the barrier coating layer 28 contains an acrylic material. The organic layer is advantageous in terms of good adhesion with the polarizing layer 30 and easy processing compared with the inorganic layer.

The acrylic resin layer can be configured by curing the 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 a methacrylate. Similarly, a (meth) acryloyl group shall represent acryloyl group and / or methacryloyl group.

The total hydroxyl value except the solvent of the (meth) acrylate component is 100-200 mgKOH / g. By suppressing the hydroxyl value of the (meth) acrylate component in a polymeric resin composition in this range, the adhesiveness and adhesiveness to the polarizing layer 30 of an acrylic resin layer can be improved. Since the adhesiveness with respect to the polarizing layer 30 is favorable, an acryl-type resin layer can give the polarizing layer 30 the outstanding durability. As long as the hydroxyl value of the whole (meth) acrylate component exists in the said range, the (meth) acrylate component may further contain the (meth) acrylate compound which does not have a hydroxyl group.

The hydroxyl value in solid content conversion of a polymeric resin composition can be calculated | required by the following formula (2).

In Formula (2), the average molecular weight of resin represents the average molecular weight of the (meth) acrylate mixture computed from the molecular weight of each (meth) acrylate contained in a (meth) acrylate component, and a compounding ratio. For example, when a (meth) acrylate component contains XA weight% of the (meth) acrylate (A) of molecular weight MA and XB weight% of the (meth) acrylate component (B) of molecular weight MB, The average molecular weight M is represented by M = MAxXA / 100 + MBxXB / 100. Also when a (meth) acrylate component contains another (meth) acrylate, an average molecular weight can be computed similarly based on a compounding ratio.

As a (meth) acrylate (A) containing a hydroxyl group, EHC modified butyl acrylate (Danacol DA-151 by Nagase Industries Co., Ltd.), glycerol methacrylate (Bremer GLM by Nichi Oil), 2 -Hydroxy-3-methacryloxypropyltrimethylammonium chloride (Bremer QA from Nichi Oil), EO modified phosphate acrylate (light ester PA from Kyoeisa Chemical Co., Ltd.), EO modified phthalate acrylate (biscote 2308 from Osaka Organics) , EO, PO modified phthalic acid methacrylate (light ester HO made by Kyoeisa Chemical Co., Ltd.), acrylated isocyanurate (Aronix M-215 by Toagosei Co., Ltd.), EO modified bisphenol A diacrylate (made by Kyoe Chemical Co., Ltd.) Epoxy ester 3000A), dipentaerythritol monohydroxypentaacrylate (SR-399, manufactured by Satomer), glycerol dimethacrylate (Denacol DM-811, manufactured by Nagase Industries Co., Ltd.), glycerol acrylate (Bremer GAM by Nichi Oil),Glycerol dimethacrylate (Bremer GMR from Nichi Oil), ECH modified glycerol triacrylate (Denacol DA-314 by Nagase Industries), ECH modified 1,6-hexanediol diacrylate (Kayarad R-167 made by Nihon Kayaku) ), Pentaerythritol triacrylate (cayarad PET-30 made by Nihon Kayaku), stearic acid-modified pentaelthritol diacrylate (aronix M-233 made by Toagosei), ECH modified phthalic acid diacrylate (Denacol made by Nagase Industries, Ltd.) DA-721), triglycerol diacrylate (epoxyester 80 MFA manufactured by Kyoeisa Chemical Co., Ltd.), 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (Meth) acrylate etc. are mentioned.

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

Content in the polymeric resin composition of the (meth) acrylate (A) containing a hydroxyl group becomes like this. Preferably it is 50-99 weight% in solid content of a polymeric resin composition, More preferably, it is 70-99 weight%.

The polymerizable resin composition may further contain (meth) acrylate (B) having three or more (meth) acryloyl groups. As (meth) acrylate (B) which has three or more (meth) acryloyl groups, for example, pentaerythritol triacrylate (kayarade PET-30 made from Nippon Kayaku), pentaerythritol tetraacrylate (kaya made by Nihon Kayaku) Lard PET-40), pentaerythritol tetramethacrylate (SR-367 made by Satomer), dipentaerythritol hexaacrylate (Kayarad DPHA made by Nippon Kayaku), dipentaerythritol monohydroxypentaacrylate (SR- made by Satomer) 399), alkyl modified dipentaerythritol pentaacrylate (Kayarad D-310 made by Nihon Kayaku), alkyl modified dipentaerythritol tetraacrylate (Kayarad D-320 made by Nihon Kayaku), alkyl modified dipentaerythritol triacrylate ( Kayonard D-330 made in Nihon Kayaku, Caprolactone modified dipentaerythritol hexaacrylate (Kayarad DPCA-20 made in Nihon Kayaku, Kayayarad DPCA-6 0, Nihon Kayaku made Kayarard DPCA-120), trimethylolpropane triacrylate (Kayarad made of Nihon Kayaku) TMPTA, trimethylolpropane trimethacrylate (SR-350 made by Satomer), ditrimethylolpropane tetraacrylate ( SR-355 made by Satomer, neopentyl glycol modified trimethylolpropanediacrylate (Kayarad R-604 made by Nihon Kayaku), EO modified trimethylolpropane triacrylate (SR-450 made by Satomer), PO modified trimethylolpropane tree Acrylate (Kayarad TPA-series made by Nihon Kayaku) or ECH modified trimethylolpropane triacrylate (Deconal DA-321 made by Nagase Industries), tris (acryloxyethyl) isocyanurate (aronix M315 made by Toagosei) Epichlorohydrin (ECH) modified glycerol tri (meth) acrylate, ethylene oxide (EO) modified glycerol tri (meth) acrylate, propylene oxide (PO) modified glycerol Li (meth) acrylate, EO-modified phosphoric acid tri (meth) acrylate, caprolactone-modified trimethylolpropane tri (meth) acrylate, EO-modified trimethylolpropane tri (meth) acrylate, PO-modified trimethylolpropane tree (meth ) Acrylate, silicone hexa (meth) acrylate, urethane acrylate which is a reaction product of diol with polyisocyanate and (meth) acrylate having hydroxyl group, and polyfunctional (meth) acrylate having active hydrogen (hydroxyl group, amine, etc.) And polyfunctional urethane (meth) acrylate, which is a reactant of a polyisocyanate compound and the like.

Content in the polymeric resin composition of the (meth) acrylate (B) which has three or more (meth) acryloyl groups, in solid content of a polymeric resin composition, Preferably it is 50-99 weight%, More preferably, 70-99 weight%.

It is preferable that the average value of the number of the (meth) acryloyl groups in the whole (meth) acrylate component is 3-6. When the average value of the number of (meth) acryloyl groups is the said range, the hardness of a film | membrane is high, a scar is hard to generate | occur | produce during a coating process, and there exists an effect which can improve the durability of the polarizing layer 30.

(Meth) acrylate component has (meth) acrylate (A) which has a hydroxyl group, and (meth) acryl having 3 or more of (meth) acryloyl groups, as long as the hydroxyl value of a (meth) acryl component exists in the said range. In addition to the acrylate (B), you may further contain other (meth) acrylate in arbitrary ratios.

As a photoinitiator, For example, benzoin, 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-morpholinopropane-1-one; Anthraquinones such as 2-ethylanthraquinone, 2-t-butylanthraquinone, 2-chloroanthraquinone, and 2-amylanthraquinone; Thioxanthones, such as 2, 4- diethyl thioxanthone, 2-isopropyl thioxanthone, and 2-chloro thioxanthone; Ketals such as acetophenone dimethyl ketal and benzyl dimethyl ketal; Benzophenones such as benzophenone, 4-benzoyl-4'-methyldiphenylsulfide, and 4,4'-bismethylaminobenzophenone; 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 polymerizable resin composition, content of a photoinitiator becomes like this. Preferably it is 0.5-10 weight%, More preferably, it is 1-7 weight% in solid content of a polymeric 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-methyl diethanolamine, 2-methylamino ethyl benzoate, dimethylamino acetophenone, p-dimethylamino benzoic acid isoamino ester, EPA, etc. Amines and hydrogen donors such as 2-mercaptobenzothiazole. The usage-amount of a hardening accelerator is 0 to 5 weight% preferably in solid content of a polymeric resin composition.

Since the acrylic resin layer which hardens the said polymeric resin composition has a hydroxyl group, adhesiveness with a triacetyl cellulose improves and adhesiveness with the polarizing layer 30 after a saponification process improves.

It is preferable that the inorganic layer used as the barrier coating layer 28 contains silicon oxide (SiOx) or silicon nitride (SiNx). The inorganic layer can be formed by sputtering, atomic layer deposition (ALD), or the like. The inorganic layer is advantageous in that the transmittance of water can be reduced even if the inorganic layer is thinner than the organic layer.

The hybrid layer has a structure in which an organic layer and an inorganic layer are laminated. By using the barrier coating layer 28 as a hybrid layer, the combined effect of the organic layer and the inorganic layer can be obtained. Specifically, after forming an organic layer on the polarizing layer 30, by laminating an inorganic layer on the organic layer, the adhesiveness between the organic layer and the polarizing layer 30 and the waterproofness of the inorganic layer are combined more. The thin layer can exhibit the function as the barrier coating layer 28.

The barrier coating layer 28 preferably has a film thickness such that moisture contained in the polarizing layer 30 is hard to reach the common electrode 26 or the liquid crystal layer 22. On the other hand, when the barrier coating layer 28 is made too thick, color mixing between pixels will likely occur, or a decrease in efficiency due to absorption of light will likely occur. Therefore, the film thickness of the barrier coating layer 28 is preferably 5 μm or less. More preferably, it is 1 micrometer or less. For example, when the barrier coating layer 28 is an organic layer, the film thickness is preferably 0.5 µm or more and 5 µm or less. In addition, when the barrier coating layer 28 is made into an inorganic layer, for example, it is preferable that the film thickness shall be 50 nm or more and 500 nm or less. For example, when the barrier coating layer 28 is made into a hybrid layer, it is preferable to make an organic layer into 0.5 micrometer or more and 5 micrometers or less, and to make an inorganic layer 50 nm or more and 500 nm or less.

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

The alignment film 24 is formed on the common electrode 26. The alignment film 24 is made of a resin material such as polyimide. For example, the alignment film 24 prints a 5 wt% solution of N-methyl-2-pyrrolidinone, which becomes a polyimide resin, on the common electrode 26, and cures by heating at about 110 ° C. to 280 ° C. After making it carry out, it carries out rubbing with a rubbing cloth, and can form and orient-process. The alignment direction of the alignment film 24 is a direction orthogonal to the alignment direction of the alignment film 20.

It is also possible to use a photoalignment film at this time, and using a photoalignment film becomes low temperature process of 130 degrees C or less easy. In the optical alignment, in order to improve the viewing angle characteristic, the pixel may be divided by changing the orientation direction in a region within one pixel by changing the irradiation direction of light. The orientation direction may be determined by an inclined electric field by providing slits in either or both of the pixel electrode and the display electrode without performing alignment processing such as rubbing and photoalignment (Japanese Patent Laid-Open No. 05-222282). ). Moreover, you may form a processus | protrusion (Japanese Unexamined-Japanese-Patent No. 06-104044) on either or both of a display electrode and a common electrode, and orientation control may be performed.

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, a liquid crystal is injected between the alignment film 20 and the alignment film 24, and the surroundings are sealed with 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 alignment state of the initial stage (when no electric field is applied) of the liquid crystal of the liquid crystal layer 22 is that of the alignment film 20 and the alignment film 24. Determined by 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 to control the orientation of the liquid crystal layer 22. The light transmission / impermeability is controlled. Here, the liquid crystal layer 22 consists of negative liquid crystal of dielectric anisotropy.

The backlight 36 includes a light source that outputs light. It is preferable that a light source is made into LED, for example. It is preferable that the wavelength of the light output from the backlight 36 is light of a wavelength region that can be effectively used for wavelength conversion in the wavelength conversion layer 32. For example, it is preferable that the backlight 36 is a light source that outputs light in a wavelength range of 380 nm to 460 nm or less, 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 light use efficiency can be improved by converting and using the light from the backlight 36 in the wavelength conversion layer 32. Thereby, the energy efficiency in the liquid crystal display device 100 can be improved, and the liquid crystal display device 100 of low power consumption can be implement | achieved. In addition, by applying a semiconductor layer having a quantum dot structure as the wavelength conversion layer 32, the power consumption can be made lower than in the case of using a phosphor.

In addition, the wavelength conversion layer 32 also has the counter substrate 34 and the liquid crystal layer 22 by having an in-cell structure in which the polarizing layer 30 is formed between the counter substrate 34 and the liquid crystal layer 22. The distance between the light emitting body, the display electrode 18, and the TFT substrate 14 can be made closer than before. For example, the opposing substrate 34 has a thickness of about 500 μm, and the thickness of the opposing substrate 34 is greater than the case where the polarizing layer 30 is formed between the opposing substrate 34 and the backlight 36. The wavelength conversion layer 32 can be as close to the display electrode 18 as possible. As a result, the margin of distance between the pixels for avoiding color mixing between the pixels can be reduced. Therefore, the liquid crystal display device 100 having a high resolution can be provided.

Moreover, it is preferable to make the transmittance | permeability of the light of the wavelength range of 460 nm or less from the polarizing plate 10 which is the light incident side immediately before the wavelength conversion layer 32 (FIG. 1, the polarizing layer 30). Specifically, the transmittance of at least any of the 380 nm or less wavelength regions from the polarizing plate 10 to immediately before the wavelength conversion layer 32 (in FIG. 1, the polarizing layer 30) is 1% or more and 380 nm to 380. It is preferable that the transmittance of at least any one region of the 400 nm wavelength region satisfies at least one condition of at least 3% and the transmittance of at least one region of the 400 nm to 430 nm wavelength region. In order to set it as such transmittance | permeability, it is preferable to set it as the following structures.

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

Moreover, it is preferable that the polarizing layer 30 makes the transmittance | permeability of the light of the wavelength range of 460 nm or less high. Specifically, the transmittance of at least any region of the 380 nm or less wavelength region of the polarizing layer 30 is 3% or more, and the transmittance of at least any region of the 380 nm to 400 nm wavelength region is 400 nm to 430. It is preferable that the transmittance of at least any of the wavelength ranges of nm satisfies at least one condition of 5% or more.

What is necessary is just to reduce the addition amount of the absorber with respect to the light of the wavelength range of 460 nm or less in order to raise the transmittance | permeability of the light of the wavelength range of 460 nm or less of the polarizing plate 10. Usually, since the TAC used as the base material of the polarizing plate 10 contains the absorber for short wavelength regions, such as an ultraviolet absorber, the transmittance | permeability of the light of a wavelength range of 460 nm or less can be improved by reducing the said absorber.

Moreover, it is preferable to make the light transmittance of the wavelength region of 460 nm or less high by making the film thickness of the alignment film 20 and / or the alignment film 24 thin. The film thickness of the alignment film 20 and / or the alignment film 24 is preferably 50 nm or less, and more preferably 5 nm or less. Thereby, absorption of the light of the 460 nm or less wavelength range in the oriented film 20 and / or the oriented film 24 can be suppressed, and the transmittance | permeability in the said wavelength range can be improved.

In addition, it is preferable to increase the transmittance of light in the wavelength region of 460 nm or less by making the liquid crystal layer 22 thin. 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 make the retardation in the liquid crystal layer 22 into a preferable value, it is preferable to adjust the refractive index (DELTA) n of the liquid crystal layer 22 according to the film thickness of the liquid crystal layer 22. FIG. 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 having a thickness of 1 to 2 µm, but preferably a 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 insulation film 16. Thereby, the light transmittance of the short wavelength region of 460 nm or less can be made high.

In addition, it is preferable that the interlayer insulation film 16 be an inorganic film, and the film thickness shall be 0.5 micrometer or less. For example, the interlayer insulating film 16 may be a silicon oxide film (SiO ₂ film), and the film thickness thereof may be 100 nm. Thereby, the light transmittance of the short wavelength region of 460 nm or less can be made high.

In addition, the TFT substrate 14 preferably has a thickness of 500 μm or less, and more preferably 200 μm or less. It is also preferable to use borosilicate glass, quartz glass, sapphire glass, or the like having less impurities as the TFT substrate 14. Thereby, the transmittance | permeability of the light of the wavelength range of 460 nm or less can be made high.

In addition, the display electrode 18 preferably has a film thickness of 50 nm or less, and more preferably 20 nm or less. In addition, the thickness of the common electrode 26 is preferably 50 nm or less, and more preferably 20 nm or less. Thereby, the transmittance | permeability of the light of the wavelength range of 460 nm or less can be made high.

In addition, although different from the structure shown in FIG. 1, it is also preferable to apply the structure of the TFT substrate which does not provide the interlayer insulation film 16 in order to improve the transmittance | permeability of the light of 460 nm or less. In this case, although the effective display area (or aperture ratio) which contributes to the display in the pixel pixel becomes small, when the external light utilization efficiency becomes higher than that, you may employ | adopt this system.

In addition, these structures for increasing the transmittance of light in the wavelength range of 460 nm or less may be employ | adopted independently, and may combine multiple.

In this manner, 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, the short wavelength component of external light incident from the polarizing plate 10 side is converted into a wavelength conversion layer ( 32), the light emission by external light can be utilized efficiently. Accordingly, the liquid crystal display device 100 having high contrast and excellent visibility even in outdoor light such as outdoors can be obtained.

<2nd embodiment>

Although the liquid crystal display device 200 in 1st Embodiment set it as the structure of VA (vertical orientation) type liquid crystal display device, the application range of this invention is not limited to this. In 2nd Embodiment, the structure of an IPS (lateral electric field switching) type liquid crystal display device is demonstrated.

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

The alignment films 20a and 24a are alignment films which are oriented in a direction close to parallel with respect to the counter substrate 34, and are subjected to an alignment process by rubbing or photoalignment. The alignment direction is aligned so that the alignment films 20a and 24a are parallel to each other. In the photo-alignment, the pretilt angle is lost and the viewing angle characteristic is improved, which is more preferable. It is assumed that the liquid crystal layer 22a has positive or negative dielectric anisotropy. If the dielectric constant is positive, the low temperature response characteristics are good, and there are advantages such as being difficult to be affected by moisture. In addition, when the dielectric anisotropy is denied, an improvement in transmittance is expected because the liquid crystal layer 22a is controlled almost completely parallel to the counter substrate 34 at the time of voltage application.

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

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

Moreover, even when it is set as the IPS type liquid crystal display device 200 by making the light transmittance of the light wavelength region of 460 nm or less from the polarizing plate 10 which is the light incident side to the wavelength conversion layer 32 high, 1st Embodiment Similarly, it is possible to provide a new liquid crystal display device in which visibility in external light is also increased without lowering visibility in a dark place.

Here, the second interlayer insulating film (16a), its thickness, for the inorganic film, for example, the following 500㎚ it is preferable to use a silicon oxide film (SiO ₂ film). Thereby, the light transmittance of the short wavelength region of 460 nm or less can be made high.

Moreover, it is preferable that the film thickness of the common electrode 26a shall be 50 nm or less, and also it is desirable to set it as 20 nm or less. Thereby, the light transmittance of the short wavelength region of 460 nm or less can be made high.

In addition, it is not necessary to provide all the polarizing layer 30 which reduced the moisture content shown in the said 1st and 2nd embodiment, the barrier coating layer 28, and each layer which raised the transmittance | permeability of a short wavelength area, all independently or in combination You may apply.

<Variation example>

In the case of using the above-described blue light source as the backlight 36, as the wavelength conversion layer 32, generally, an absorption type color filter that absorbs light having a wavelength longer than blue is used for the wavelength region of blue (B). In the wavelength range of green (G), a wavelength conversion material converts and outputs incident light into light in the green wavelength region, and converts the incident light into light in the red wavelength region in the red (R) wavelength region. The wavelength conversion material to output is used.

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

Therefore, in this modification, as shown in FIG. 4, the color filter which absorbs the light of the green wavelength conversion material 32a and the red wavelength range in the green (G) area | region of the wavelength conversion layer 32 ( 32b) is made into an overlapping structure. An example of the color filter 32b which absorbs the light of a red wavelength range is shown in FIG.

Thereby, even if light of a red wavelength range mixes in the green G area | region of the wavelength conversion layer 32, it can be absorbed by the color filter 32b, and it can prevent that the influence on the visual side.

In addition, instead of providing the color filter 32b, as shown in FIG. 5, the pigment | dye which absorbs red in the green wavelength conversion material 32a in the area | region of the green G of the wavelength conversion layer 32 is shown. You may make it mix 40.

In addition, when using the above-mentioned UV light source as a backlight, as wavelength conversion layer 32, the wavelength conversion material which converts and outputs incident light into the light of a blue wavelength range also uses the wavelength range of blue (B), In the wavelength range of green (G), a wavelength conversion material converts and outputs incident light into light in the green wavelength region, and in the wavelength range of red (R), the incident light is converted into light in the red wavelength region and output. A configuration using a wavelength conversion material to be used is also adopted.

At this time, the wavelength converting material of blue (B) and green (G) can convert the wavelength of light shorter than the wavelength range of blue and green, respectively, but the wavelength of light longer than the wavelength range of blue and green is wavelength. Can't convert Accordingly, light in the green and red wavelength ranges that have passed through the area of the wavelength conversion material of the wavelength conversion layer 32 due to incidence of external light is reflected from the light guide plate, the reflector on the back surface of the light guide plate, or the like (B) or green (G). In the area of the wavelength converting material of), light in the green and red or red wavelength regions may be mixed with each other in the blue (B) and green (G) regions.

Therefore, in this modification, as shown in FIG. 6, the color which absorbs the light of the blue wavelength conversion material 32c and the green and red wavelength range in the blue B area | region of the wavelength conversion layer 32 is shown. It is set as the structure which overlapped the filter (blue color filter) 32d. In the green (G) region of the wavelength conversion layer 32, the green wavelength conversion material 32a and the color filter 32b absorbing light in the red wavelength region are overlapped. An example of the color filter 32d which absorbs the light of a wavelength range of green and red in FIG. 11 is shown.

As a result, even if light in the red wavelength region 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 are absorbed and are visible. This can be prevented from affecting.

In addition, instead of providing the color filters 32b and 32d, as shown in FIG. 7, in the area | region of blue (B) and green (G) of the wavelength conversion layer 32, blue wavelength conversion material ( In the 32c), the dye (blue dye) 41 which absorbs green and red and the dye 40 which absorbs red may be mixed in the green wavelength conversion material 32a.

This modified example can also be employed in a method of increasing the light utilization efficiency by using the return light by the reflective polarizer described in the present invention, whereby the color mixing in the case of using the reflective polarizer can be prevented.

For example, as shown in FIG. 8, when the above-mentioned blue light source is used as a backlight, as wavelength conversion layer 32, generally light of wavelength longer than blue is absorbed about the wavelength range of blue (B). In the wavelength range of green (G), the wavelength conversion material 32a which converts incident light into the light of the green wavelength range, and the color filter which absorbs the light of the red wavelength range are used. 32b) is made into an overlapping structure.

Accordingly, even if the red light reflected by 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 has an influence on the viewing side. Can be prevented.

For example, as shown in FIG. 9, when using the above-mentioned UV light source as a backlight, as wavelength conversion layer 32, blue wavelength in the area | region of the blue B of the wavelength conversion layer 32 is shown. The conversion material 32c and the color filter (blue color filter) 32d which absorb the light of a wavelength range of green and red are overlapped. In the green (G) region of the wavelength conversion layer 32, the green wavelength conversion material 32a and the color filter 32b absorbing light in the red wavelength region are overlapped.

Accordingly, even if the light in the red wavelength region reflected by 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 ( It is absorbed by 32b), and it can prevent that influence on the visual recognition side.

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

Claims (13)

With backlight,
A wavelength conversion layer that receives the light from the backlight and outputs wavelength converted light;
A liquid crystal layer disposed closer to the viewer side than the wavelength conversion layer;
A polarization layer disposed between the wavelength conversion layer and the liquid crystal layer;
As a liquid crystal display device provided with the polarizing plate arrange | positioned rather than the said liquid crystal layer at the visual recognition side,
1% or more of the transmittance | permeability of the wavelength range of 380 nm or less between the said polarizing plate and the said wavelength conversion layer is 1% or more, and the transmittance | permeability of at least any area | region of the 380 nm-400 nm wavelength region is 3% or more, 400 nm- A transmittance of at least one of the wavelength ranges of 430 nm satisfies at least one condition of 5% or more. The method of claim 1,
1% or more of the transmittance | permeability of the wavelength range of 380 nm or less of the said polarizing plate is 1% or more, and the transmittance | permeability of at least any area | region of the 380 nm-400 nm wavelength range is 3% or more and at least any of the wavelength ranges of 400 nm-430 nm A transmittance of a region satisfies at least one condition of 5% or more. The method of claim 1,
At least 1% of the transmittance | permeability of the wavelength range of 380 nm or less of the said polarizing layer is at least 1% of the wavelength range of 400 nm-430 nm, and the transmittance | permeability of at least any area | region is 380 nm-400 nm. A transmittance of a certain region satisfies at least one condition of 5% or more. The method according to any one of claims 1 to 3,
Two alignment layers which sandwich the said liquid crystal layer, and at least one film thickness of the said alignment layer are 50 nm or less, The liquid crystal display device characterized by the above-mentioned. The method according to any one of claims 1 to 4,
The liquid crystal display device has a thickness of 4 µm or less. The method according to any one of claims 1 to 5,
An interlayer insulating film in a TFT substrate for controlling the liquid crystal layer is an organic film, and has a thickness of 1 μm or less. The method according to any one of claims 1 to 5,
A liquid crystal display device comprising no interlayer insulating film in a TFT substrate for controlling the liquid crystal layer. The method according to any one of claims 1 to 7,
The thickness of the board | substrate provided in the visual recognition side is 500 micrometers or less, The liquid crystal display device characterized by the above-mentioned. The method of claim 8,
The substrate is any one of borosilicate glass, quartz glass and sapphire glass. The method according to any one of claims 1 to 9,
The thickness of a display electrode is 50 nm or less, The liquid crystal display device characterized by the above-mentioned. The method according to any one of claims 1 to 10,
The thickness of a common electrode is 50 nm or less, The liquid crystal display device characterized by the above-mentioned. The method according to any one of claims 1 to 11,
The liquid crystal portion including the liquid crystal layer is a transverse electric field system, and the thickness of the interlayer insulating film between the common electrode and the display electrode is 500 nm or less. With backlight,
A wavelength conversion layer that receives the light from the backlight and outputs wavelength converted light;
A liquid crystal layer disposed closer to the viewer side than the wavelength conversion layer;
A polarization layer disposed between the wavelength conversion layer and the liquid crystal layer;
As said polarizing plate used for the liquid crystal display device provided with the polarizing plate arrange | positioned rather than the said liquid crystal layer at the visual recognition side,
1% or more of transmittance of at least one of the wavelength ranges of 380 nm or less, 3% or more of transmittance of at least any of the wavelength ranges of 380 nm to 400 nm, and transmittance of at least any of the wavelength ranges of 400 nm to 430 nm A polarizing plate which satisfies at least one condition of 5% or more.

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