JP2015036796A5 - - Google Patents

Description

The white light source used in the liquid crystal display device is not only a cold cathode fluorescent lamp (CCFL) but also a blue LED or ultraviolet light emitting LED corresponding to the recent thinning and power saving needs, and a white color that combines yellow or red and green phosphors. LED system is on the market. These light sources include a sub-spectrum corresponding to an intermediate color of R and G, or an intermediate color of G and B, and because the spectrum itself is broad, so a large amount of light having a wavelength corresponding to the intermediate color is emitted. It is the cause. For example, the blue spectral relative emission intensity spectrum emitted from the blue LED includes light having a wavelength of 580 nm or more and 610 nm or less corresponding to an intermediate color between R and G, as in the curve LED-BL shown in FIG. ing.

(In the general formula ^{(III), R 1, R} 2, R 3 and ^{R 4} are each independently an alkyl group, an alkenyl group or an aryl group having a carbon number of 6-8 of C2-8 carbons 1-8 U represents N or CH. W and Z each independently represent an atomic group necessary for forming an aromatic ring, and L is composed of 3 , 5, or 7 methines. Represents a methine chain, and X represents a counter ion.)

<5> In general formula (I), R ³ and R ⁴ each independently represent an alkyl group or an aryl group, Y ¹ and Y ² represent NH, and X ³ and X ⁴ represent an oxygen atom. R ⁸ and R ⁹ represent an alkyl group, and Ma represents a metal atom. The optical substrate according to any one of <1> to <4>.
<6> Furthermore, the optical base material as described in any one of <1>-<5> containing the polymeric compound which has an ethylenically unsaturated group, and a photoinitiator.
<7> The color filter configured by an arrangement of colored layers of a plurality of colors, a light source, and any one of <1> to <6> disposed on an optical path from the light source to the color filter. And an optical substrate.
<8> The display device according to an optical substrate also serves as a diffusion film <7>.
<9> The display device according to an optical substrate also serves as an adhesive layer <7> or <8>.

(In General Formula (III), R ¹ , R ² , R ³ and R ⁴ are each independently an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an aryl group having 6 to 8 carbon atoms. U represents N or CH. W and Z each independently represent an atomic group necessary for forming an aromatic ring, and L is composed of 3 , 5, or 7 methines. Represents a methine chain, and X represents a counter ion.)

X ⁵ is preferably a halogen atom, an aliphatic carboxylic acid group, an aromatic carboxylic acid group, an aliphatic imide group, an aromatic imide group, a sulfonic acid group or a nitrogen-containing ring compound, and preferably a hydroxyl group, an aliphatic carboxylic acid group, an aromatic A group imide group and a nitrogen-containing ring compound are more preferred.

The alkyl part of the aralkyl group is the same as the above alkyl group. The aryl part of the aralkyl group includes the same aryl group as described later. Examples of aralkyl groups include benzyl and phenethyl. When the aralkyl group has a substituent, the aralkyl moiety is the same as the above aralkyl group. When the alkyl part of the aralkyl group has a substituent, examples of the substituent include those similar to the examples of the substituent of the alkyl group. In the case where the aryl moiety of the aralkyl group has a substituent, examples of the substituent include those mentioned as the substituents of the nitrogen-containing heterocyclic ring and the condensed ring thereof.

Hereinafter, the general formula (III) will be described in detail.
In the general formula (III), R ¹ , R ² , R ³ and R ⁴ each independently represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms or an aryl group having 6 to 8 carbon atoms. Represent. U represents N or CH. W and Z each independently represent an atomic group necessary for forming an aromatic ring. L represents a methine chain composed of 3 , 5, or 7 methines. X represents a counter ion.

In general formula (IIIa), R ^4A , R ^4B , R ^5A and R ^5B are an alkyl group, an alkenyl group or an aryl group, and these may be the same as or different from each other. L ¹ represents methine group or substituted is three, five or seven linked comprising trivalent radical as methine group to form a conjugated double bond, Z ^A and Z ^B Is an atomic group for forming an aromatic ring, and X ⁻ is an anion. )
In the general formula (IIIa), each of Z ^A , Z ^B , L ¹ , R ^4A , R ^4B , R ^5A and R ^5B may further have a substituent. Among these substituents, a substituent having a hydrophobic parameter π proposed by C. Hansch and the like in the range of −1.0 to 15 is preferable.

As the atomic group represented by Z ^A or Z ^B in the general formula (IIIa), an atomic group for forming a benzene ring, a naphthalene ring or an anthracene ring is preferable, and among them, for forming a benzene ring or a naphthalene ring. An atomic group is particularly preferred. Further, ^{Z A} and Z ^B, the ^{R 4A,} R ^4B, may have the substituent groups mentioned as substituents in ^{R 5A} or ^{R 5B.} Examples of the substituent in Z ^A and Z ^B include a halogen atom (for example, F, Cl, Br, and I), a substituted or unsubstituted phenyl group (for example, a phenyl group, an m-chlorophenyl group, and a p-methylphenyl group). Etc.), alkylthio groups (eg, methylthio group and butylthio group), substituted or unsubstituted phenylthio groups (eg, phenylthio group, p-chlorophenylthio group and m-methylphenylthio group), substituted or unsubstituted alkyl Groups (for example, methyl group, trifluoromethyl group and tert-amyl group), cyano group, alkoxycarbonyl group (for example, propoxycarbonyl group, butoxycarbonyl group, benzyloxycarbonyl group, decyloxycarbonyl group, and 2-ethylhexyloxy) Carbonyl group etc.) and alkyl or ant Rusuruhoniru group (e.g., butanesulfonyl group, and a phenylsulfonyl group and a C1-12alkyl group).

<Display device>
The display device according to the present invention includes a color filter constituted by an arrangement of colored layers of a plurality of colors, a light source, and an optical substrate disposed on an optical path from the light source to the color filter.
As the light source, for example, an edge light type using a light guide plate or a direct type is used. The light source includes, for example, the following. That is, CCFL (Cold Cathode Fluorescent Lamp: cold cathode fluorescent lamp), FFL (Flat Fluorescent Lamp: flat fluorescent lamp), and the like. Further, they are LED (Light Emitting Diode), EL (Electro Luminescence), and the like.
Furthermore, in the form using the quantum dot backlight for the blue LED light source, the effect of expanding the color reproduction range while suppressing the decrease in luminance can be obtained more preferably. A quantum dot is a material formed by crystallizing a semiconductor material (CdS / ZnS) into several nanometers, has quantum mechanical optical characteristics, absorbs electrons and photons, and has a wavelength (UV, visible light) defined by the crystal size. , Far infrared rays) with high efficiency. This quantum dot is used for red and green photoluminescence materials, and is used in combination with a blue LED light source for an LCD backlight light source to improve the color reproduction range.
In addition to this, the light source may be provided with a reflector for diffusing the light returned from the liquid crystal display panel side and reusing it as display light (recycling).
It is preferable that a diffusion plate is provided between the light source and the color filter. The diffuser plate has a function of diffusing the light from the light source 21 to keep the luminance in the in-plane direction uniform.

In the present invention, the optical substrate according to the present invention is disposed on an optical path through which light from the light source reaches the color filter. Thereby, light having a wavelength of 580 nm or more and 610 nm or less corresponding to an intermediate color of red (R) and green (G) contained in the light emitted from the light source is absorbed by the optical substrate. Therefore, the light reaching the color filter contains almost no light having a wavelength of 580 nm or more and 610 nm or less, so that the color purity of the image displayed on the liquid crystal display panel is improved.
Therefore, it may be arranged at any position as long as the light emitted from the light source passes through the optical substrate according to the present invention before reaching the color filter.
Particularly preferred positions of the optical substrate according to the present invention, for example, a liquid crystal display between the liquid crystal display panel and the backlight unit in the device, between the light source and the diffusion plate in the backlight unit, the liquid crystal of the diffusion plate in the backlight unit Examples include the display panel side surface.

<Manufacture of resist solution>
Each component shown below was prepared at the following ratio and stirred with a stirrer until each component was completely dissolved to obtain a resist solution.
Polymerizable compound: dipentaerythritol hexaacrylate: 0.21 parts alkali-soluble binder (allyl methacrylate / methacrylic acid copolymer = molar ratio 70/30, weight average molecular weight 26800): 2.06 parts Photopolymerization initiator (Oxime compound 1) (1- (O-acetyloxime) -1- [9-ethyl-6- (thiophenoyl) -9H-carbazol-3-yl] propanone):
0.06 parts mercapto compound (Showa Denko Karenz MTBD1): 0.02 parts Solvent (propylene glycol monomethyl ether acetate): 5.41 parts Fluorosurfactant (DIC Megaf F-554 manufactured by DIC): 0.0003 parts

<Production of blue pixels>
Pigment is changed to P.I. B. P. 15 except for change to 15: 6. R. A mill base was prepared with the same composition as that of the dispersion ink of H.254, and subjected to a dispersion treatment under the same dispersion conditions with a residence time of 1 hour. B. A 15: 6 dispersion ink was obtained.
In addition, pigments V. Except for the change to 23 R. A mill base was prepared with the same composition as that of the dispersion ink of H.254, and subjected to a dispersion treatment with a residence time of 2 hours under the same dispersion conditions. V. 23 dispersion inks were obtained.

(Example 1) Preparation of optical substrate containing above-mentioned exemplary compound (C-16) As a specific color material, exemplary compound (C-16) was 1.2% with respect to the solid content of the above-mentioned resist solution. After being applied onto a polyethylene terephthalate film (manufactured by Teijin Ltd., thickness 35 μm) with a die coater, dried, and then irradiated with 100 mJ / cm ² of ultraviolet light, it is dried with hot air to produce the present invention. The optical base material 1 which concerns is produced.

(Example 2) Preparation of optical base material containing above-mentioned exemplary compound (C-20) In the same manner as the above-mentioned preparation of optical base material 1, except that in place of exemplary compound (C-16), exemplary compound (C-16) C-20) was used to produce an optical substrate 2 according to the present invention.

(Example 3) Preparation of optical base material containing above-mentioned exemplary compound (C-21) In the same manner as the preparation of optical base material 1 described above, except that instead of exemplary compound (C-16), exemplary compound (C-16) C-21) was used to produce an optical substrate 3 according to the present invention.

(Example 4) Preparation of optical base material containing above-described exemplary compound (A-10) In the same manner as in the preparation of optical base material 1 described above, except that instead of exemplary compound (C-16), exemplary compound (C-16) use a-10), to produce an optical substrate 4 according to the present invention.

(Example 5) Preparation of optical base material containing above-mentioned exemplary compound (II-2) In the same manner as the above-mentioned preparation of optical base material 1, except that instead of exemplary compound (C-16), exemplary compound (C-16) using a J-aggregate of II-2), to produce an optical substrate 5 according to the present invention.

(Example 6) Preparation of optical base material containing above-mentioned exemplary compound (III-29) In the same manner as the preparation of optical base material 1 described above, except that instead of exemplary compound (C-16), exemplary compound (C-16) III-29) was used to produce an optical base 6 according to the present invention.

(Comparative Example 1) In the same manner as the preparation of tetraazaporphyrin compound optical substrate 1 Preparation aforementioned optical substrate containing, however, instead of Exemplified Compound (C-16), a tetraazaporphyrin compounds, TAP The optical base material C1 which concerns on a comparative example was produced using -18 (Yamada Chemical).

(Comparative Example 2) In the same manner as in the preparation of tetraazaporphyrin compound optical substrate 1 Preparation aforementioned optical substrate containing, however, instead of Exemplified Compound (C-16), a tetraazaporphyrin compounds, TAP use 2 (Yamada chemical), to produce an optical substrate C2 according to a comparative example.
Spectral absorption characteristics of the optical substrates 1 to 6, C1 and C2 produced as described above were measured with a spectrophotometer (manufactured by Shimadzu Corporation, UV-3100). The spectral transmittance spectrum of each optical substrate is shown in FIG. 1 for the optical substrates 1 to 4 and in FIG. 2 for the optical substrates 5, 6, C1, and C2. The numbers given to the curves in FIG. 1 and FIG. 2 correspond to the numbers of the optical substrates.

As shown in the results of Table 1, it was confirmed that the backlight on which any one of the optical substrates 1 to 6 according to the present invention was pasted was improved in color reproduction rate. In particular, the optical substrates 1 to 3 containing a colorant having a maximum absorption wavelength of 580 nm or more and 610 nm or less are backlights to which optical substrates C1 and C2 as comparative examples containing a tetraazaporphyrin dye (TAP2 or TAP18) are attached. It can be seen that the color reproduction rate is high while maintaining good luminance. This is because the absorption spectrum of the tetraazaporphyrin dye of the coloring material used for the optical substrates C1 and C2 is broad in the vicinity of the wavelength in the range of 580 nm to 610 nm, and thus absorbs light of the wavelength originally desired to be transmitted. However, the color material used in the optical substrates 1 to 3 has a sharp absorption spectrum (having a narrow half-value width) in the wavelength range of 580 nm to 610 nm. This is because there is little absorption of light to be transmitted.

Claims (9)

An optical substrate disposed on an optical path from the light source to the color filter in a display device including a color filter configured by arranging two or more colored layers in a two-dimensional direction, and a light source, At least selected from the group consisting of a metal complex compound represented by the general formula (I), a J-aggregate of a cyanine dye represented by the following general formula (II), and a cyanine dye represented by the following general formula (III) An optical substrate containing one kind of coloring material and having an absorption maximum wavelength of 580 nm or more and 610 nm or less.


(In the general formula (I), R ² , R ³ , R ⁴ and R ⁵ each independently represents a hydrogen atom or a monovalent substituent. R ⁷ represents a hydrogen atom, a halogen atom or an alkyl group. Each of R ⁸ and R ⁹ independently represents an alkyl group, an alkenyl group, an aryl group, a heterocyclic group, an alkoxy group, an aryloxy group, an alkylamino group, an arylamino group, Or represents a heterocyclic amino group, Ma represents a metal atom or a metal compound, X ³ and X ⁴ each independently represent NR ^a (R ^a represents a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, a hetero group; ring group, an alkyl group, an alkylsulfonyl group, or an arylsulfonyl group.), .Y ¹ and ^{Y 2} represents an oxygen atom or a sulfur atom, each ^{independently,} NR b ^{(R b} represents a hydrogen atom, a Kill group, an alkenyl group, an aryl group, a heterocyclic group, an alkylcarbonyl group, an alkylsulfonyl group, or an arylsulfonyl group.), An oxygen atom or a sulfur atom.
X ⁵ represents a group capable of binding to Ma. a represents 0, 1, or 2. R ⁸ and Y ¹ may be bonded to each other to form a 5-membered, 6-membered, or 7-membered ring, and R ⁹ and Y ² are bonded to each other to form a 5-, 6-, or 7-membered ring. The ring may be formed.


(In the general formula (II), Z ¹ and Z ² each independently represent a nonmetallic atom group that forms a 5-membered or 6-membered nitrogen-containing heterocyclic ring which may be condensed. R ¹⁰ and R ¹¹ Each independently represents an aliphatic group, L ¹ represents a methine chain having 1, 3 or 5 carbon atoms, X ² represents an anion, b, c and d each independently represents 0 or 1; Represents.)


(In General Formula (III), R ¹ , R ² , R ³ and R ⁴ are each independently an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an aryl group having 6 to 8 carbon atoms. U represents N or CH. W and Z each independently represent an atomic group necessary for forming an aromatic ring, and L is composed of 3 , 5, or 7 methines. Represents a methine chain, and X represents a counter ion.)   The optical base material of Claim 1 containing the at least 1 sort (s) of color material chosen from the metal complex compound represented by the said general formula (I) as said color material. The optical base material according to claim 2, wherein in the general formula (I), R ² and R ⁵ represent a heteroaryl group. The optical substrate according to claim 3, wherein the heteroaryl group is represented by the following general formula (Ia).


(In the general formula (Ia), HetAr ¹ represents a heteroaryl ring.) In the general formula (I), R ³ and R ⁴ each independently represents an alkyl group or an aryl group, Y ¹ and Y ² represent NH, X ³ and X ⁴ represent an oxygen atom, The optical substrate according to any one of claims 1 to 4, wherein R ⁸ and R ⁹ represent an alkyl group, and Ma represents a metal atom.   Furthermore, the optical base material as described in any one of Claims 1-5 containing the polymeric compound which has an ethylenically unsaturated group, and a photoinitiator.   The optical base material as described in any one of Claims 1-6 arrange | positioned on the optical path from the color filter comprised by the arrangement | sequence of the colored layer of several colors, a light source, and the said light source to the said color filter. And a display device. The display device according to claim 7, wherein the optical base material also serves as a diffusion film. The display device according to claim 7 or claim 8 wherein the optical substrate also serves as an adhesive layer.