JP2017044791A - Liquid crystal display device - Google Patents

Abstract

An object of the present invention is to provide a liquid crystal display device that has high color reproducibility, can be adapted to the DCI specification, and is advantageous in terms of cost. A backlight having a white LED mixed with a combination of a blue LED, a red phosphor and a green phosphor, and a color having a plurality of colored pixels including a red pixel, a green pixel and a blue pixel on a transparent substrate. A liquid crystal display device comprising a filter, wherein the emission spectrum of the white LED has a first peak wavelength at 440 nm to 470 nm, a second peak wavelength at 520 nm to 550 nm, and a third peak at 610 nm to 700 nm. The liquid crystal display device has a wavelength and a fourth peak wavelength, and the first peak wavelength λBmax and the second peak wavelength λGmax satisfy the following (Equation 1). 85 nm ≦ λGmax−λBmax ≦ 90 nm (Formula 1) [Selection] FIG.

Description

The present invention relates to a liquid crystal display device comprising a backlight using LEDs and a color filter.

In recent years, color liquid crystal display devices are often used in smartphones and tablets using LEDs as light sources in addition to liquid crystal color televisions and liquid crystal display device-integrated notebook personal computers, and have formed a large market.

FIG. 1 shows a schematic cross-sectional view of a liquid crystal display device 20 using LEDs as light sources. The liquid crystal display device 20 includes a liquid crystal panel 5 including a color filter substrate 1, a liquid crystal layer 2, and a TFT array substrate 3, and a backlight 4 provided on the back surface of the liquid crystal panel 5.

Although alignment films are present on the surfaces of the color filter substrate 1 and the array substrate 3 that are in contact with the liquid crystal layer 2, they are not shown. Although a black matrix exists in the same layer as the color filter 7, it is not shown. An overcoat 8 made of a transparent resin is laminated on the color filter 7 (lower layer in FIG. 1). Photo spacers are formed on the overcoat 8 to keep the distance between the color filter substrate 1 and the array substrate 3 constant when the color filter substrate 1 and the array substrate 3 are bonded together via the liquid crystal layer 2. However, the illustration is omitted. The array substrate 3 includes an array unit 16 including TFTs (transistors).

As a method of installing the LEDs in the backlight 4, a method of obtaining a surface light source by arranging light on a side surface as shown in FIG. 1 and converting light into a planar shape using a translucent light guide plate 13 such as an acrylic plate ( In addition to the edge light method, a method (direct method) in which the liquid crystal element is disposed directly under the back surface is employed. For applications that require high brightness, the direct light system is suitable, and for applications that require thinning, the edge light system is suitable.

The edge light method will be described. The backlight 4 includes white LEDs 9 and 10 as edge lights on both sides of a light guide plate 13 formed of acrylic resin or the like. White light emitted from the white LED is reflected by the reflecting plate 14 and emitted to the observer side via the light guide plate 13.

An example of the structure of the edge light type backlight 4 is shown in an assembly view as shown in FIG. That is, in a metal frame (or resin frame) 35, a light guide plate 33, a diffusion sheet 36, and two prism sheets 37, 38 in which a plurality of white LEDs 31 attached to a substrate 32 are arranged on the side surface in order. The backlight 4 is configured by stacking.

A structural example of a white LED is shown in FIG. The white LED shown here is a surface-mounted LED. (In addition to the surface mount type, an insertion type is also used). In the surface-mounted LED, a light-emitting element 52 is attached to the bottom surface of a concave portion of a light-emitting element mounting housing 51 having a concave portion opened upward, and a light-emitting phosphor 53 is placed on the light-emitting element 52. The dispersed translucent resin 54 is covered. The upper electrode of the light emitting element 52 is connected to the first external electrode 56 by the first wire 55, and the lower electrode is connected to the second external electrode 58 by the second wire 57. The light reflecting material 59 is coated on the inner surface of the concave portion of the light emitting element mounting casing 51. The light emitting element 52 has a blue light emitting layer made of a compound semiconductor, and serves as an excitation light source for a red light emitting phosphor, a green light emitting phosphor, or a yellow light emitting phosphor.
(Hereinafter, the light emitting phosphor is abbreviated as phosphor as appropriate).

Nitride-based compound semiconductors (In _i Ga _j Al _k N, where 0 ≦ i, 0 ≦ j, 0 ≦ k, i + j + k = 1) include various types of materials including InGaN and GaN doped with various impurities. There is something. This light emitting element is formed by growing a semiconductor such as InGaN or GaN on a substrate by MOCVD or the like.

Examples of the structure of the nitride compound semiconductor include a homostructure having a MIS junction, a PI junction, and a PN junction, a heterostructure, and a double heterostructure. The emission wavelength of this nitride semiconductor can be variously selected depending on the material and the degree of mixed crystal. Moreover, it can also be set as the single quantum well structure and multiquantum well structure which formed the semiconductor active layer with the thin film which produces a quantum effect.

As a white LED, a two-wavelength LED and a three-wavelength LED are given as typical pseudo-white LEDs. A two-wavelength LED is obtained by mixing light emitted from a blue LED through a phosphor such as YAG (yttrium, aluminum, garnet) and has a peak wavelength of emission intensity derived from a blue LED in a wavelength range of 440 nm to 470 nm. And has a peak wavelength of emission intensity derived from the yellow phosphor in a wavelength range of 520 nm to 560 nm.

On the other hand, in the three-wavelength LED, part of the blue light emitted from the near-ultraviolet or blue LED is transmitted through the phosphor layer, and the rest is absorbed by the green phosphor and the red phosphor, and converted into green and red light, respectively. An example is given. This white LED has a peak wavelength of emission intensity derived from a blue LED in a wavelength range of 440 nm to 470 nm, and has emission intensity derived from a green phosphor and a red phosphor in a wavelength range of 520 nm to 560 nm and 600 nm to 700 nm. Has a peak wavelength.

Many conventional display devices comply with sRGB (IEC 61966-2-1), which is an international standard for a color space (wide color reproduction range). However, in recent years, with the rapid spread of smartphones, in order to view movies, photos, etc., further expansion of the color reproduction range, that is, high color reproducibility is targeted, and high color reproducibility is required compared with sRGB. There is a growing demand for display devices that comply with the specifications of digital cinema specified by the industry group DCI (Digital Cinema Initiative), which is composed of the Hollywood movie and seven major studios called the Adobe RGB standard (hereinafter abbreviated as the Adobe standard) and the DCI specification. ing.

The Adobe standard is a definition of color reproducibility proposed by Adobe Systems. In the Adobe standard, the three primary colors are defined as follows for chromaticity coordinates (x, y) in the XYZ color system.
Red: x = 0.64; y = 0.34
Green: x = 0.21; y = 0.71
Blue: x = 0.15; y = 0.06

In the DCI specification, the three primary colors are defined as follows with respect to chromaticity coordinates (x, y) in the XYZ color system.
Red: x = 0.68; y = 0.32.
Green: x = 0.265; y = 0.69
Blue: x = 0.15; y = 0.06
The DCI specification has greatly improved red / green color reproducibility compared to the conventional sRGB standard, and the red reproducibility is higher than the Adobe standard, and the green reproduction region is more yellowish. have.

As a precedent example of high color reproducibility (color reproduction range expansion) by LED backlight, Patent Document 1 proposes to use a three-wavelength LED and Patent Document 2 to use a three-color LED, both of which improve color reproducibility. Although effective, conformity to the DCI specification has not been shown, and there remains a problem in terms of cost.

International Publication No. 2009/028370 Patent No. 531321

The present invention has been made to solve the above-described problems, and realizes a liquid crystal display device having high color reproducibility that can be adapted to the DCI specification and advantageous in terms of cost.

In order to solve the above-mentioned problem, the invention described in claim 1 is directed to a backlight including a white LED that is a mixture of a blue LED, a red phosphor, and a green phosphor, and a red pixel, green on a transparent substrate. A liquid crystal display device comprising a color filter comprising a plurality of colored pixels including a pixel and a blue pixel, wherein the emission spectrum of the white LED has a first peak wavelength of 440 nm to 470 nm and a first peak wavelength of 520 nm to 550 nm. 2 having a third peak wavelength and a fourth peak wavelength at 610 nm to 700 nm,
And chromaticity coordinates (x, y) in the XYZ color system of the liquid crystal display device are
The red pixel is in the common part of 0.314 <y <0.327 and x>0.666;
The green pixel is in the common part of 0.260 <x <0.270 and y>0.676;
In the liquid crystal display device, the blue pixel is in a common part of x <0.155 and y <0.0618.

According to a second aspect of the present invention, in the liquid crystal display device according to the first aspect, the first peak wavelength and the second peak wavelength of the emission spectrum of the white LED satisfy the following (Equation 1): It is a thing.
85 nm ≦ λ _Gmax− λ _Bmax ≦ 90 nm (Formula 1)
λ _Bmax : first peak wavelength of the emission spectrum of the white LED λ _Gmax : second peak wavelength of the emission spectrum of the white LED

According to a third aspect of the present invention, in the liquid crystal display device according to the first or second aspect, the red phosphor is a phosphor material including a composite fluoride phosphor activated with Mn ^4+. It is what.

According to a fourth aspect of the present invention, the organic pigment in the red photosensitive coloring composition used for forming the red pixel of the color filter is at least C.I. I. 60% by weight or more of the total organic pigment in the solid content of the red photosensitive coloring composition containing C.I. I. The liquid crystal display device according to any one of claims 1 to 3, wherein the pigment number is 254.

According to a fifth aspect of the present invention, the organic pigment in the red photosensitive coloring composition used for forming the red pixel of the color filter is at least C.I. I. Pigment number 254 and C.I. I.
60% by weight or more of the total organic pigment in the solid content of the red photosensitive coloring composition containing C.I. I. Pigment number 254, 30 wt% or less is C.I. I. The liquid crystal display device according to any one of claims 1 to 4, wherein the pigment number is 177.

In the invention according to claim 6, the organic pigment in the green photosensitive coloring composition used for forming the green pixel of the color filter is at least C.I. I. Pigment number 58 and C.I. I. Pigment Number 138, and 40 wt% or more and 65 wt% or less of the total organic pigment in the solid content of the green photosensitive coloring composition is C.I. I. The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a pigment number of 58.

According to a seventh aspect of the present invention, the organic pigment in the green photosensitive coloring composition used for forming the green pixel of the color filter is at least C.I. I. Pigment number 58 and C.I. I. Pigment Number 150, and 60 wt% or more and 80 wt% or less of the total organic pigment in the solid content of the green photosensitive coloring composition is C.I. I. The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a pigment number of 58.

In the invention according to claim 8, the organic pigment in the blue photosensitive coloring composition used for forming the blue pixel of the color filter is at least C.I. I. 80% by weight or more of the total organic pigment in the solid content of the blue photosensitive coloring composition containing CI Pigment Number 15: 6. I. The liquid crystal display device according to claim 6 or 7, wherein the pigment number is 15: 6.

According to the present invention, it is possible to realize a liquid crystal display device that has high color reproducibility conforming to the DCI specification and is advantageous in terms of cost compared to the three-color LED system.

It is a cross-sectional schematic diagram of the liquid crystal display device which uses LED as a light source. It is a model diagram which shows the structural example of a backlight for every component. It is a cross-sectional schematic diagram which shows the structural example of white LED. It is a characteristic view which shows the emission spectrum of backlight (1) and (2) used by the Example and the comparative example. It is a characteristic view which shows the emission spectrum of the backlights (3) and (4) used in the comparative example. It is a characteristic view which shows the emission spectrum of the backlight (5) used by the comparative example. It is a figure which shows the chromaticity coordinate of the CDI specification in an XYZ color system.

As a result of diligent research on a liquid crystal display device including an LED backlight and a color filter, the present inventors realize a liquid crystal display device that has high color reproducibility conforming to the DCI specification and is advantageous in terms of cost. In order to achieve this, the present inventors have found that it is necessary to match the emission spectrum of the LED backlight and the transmission spectrum of the color filter by strict selection of materials and characteristics.

Hereinafter, embodiments of the liquid crystal display device of the present invention will be described.
[overall structure]
The installation method of the white LEDs in the backlight of the liquid crystal display device of the present invention is not limited to the edge light method as shown in FIG. 1, but a direct method can also be adopted.

The structure of the white LED is not limited to the surface mount type as shown in FIG. 3, and an insertion type can also be used. The surface mount type will be described below.

In the liquid crystal display device of the present invention, a touch panel or a cover glass may be bonded to the polarizing film 11 (see FIG. 1), and the color filter substrate 1 is provided with touch electrodes for touch sensing or touch sensing functional elements. May be. A transparent electrode may be provided on the overcoat 8.

In the liquid crystal display device of the present invention, the chromaticity coordinates (x, y) in the XYZ color system are
The red pixel is in the intersection of x ≧ 0.674 and 0.313 <y <0.327,
The green pixel is in the intersection of y ≧ 0.684 and 0.260 <x <0.270,
The blue pixel is characterized by being in the intersection of x <0.161 and y <0.065.

The range in the common part is chromaticity coordinates (x, y) defined by the DCI specification, that is, red: (0.68, 0.32), green: (0.265, 0.69), blue: ( 0.15, 0.06), and the chromaticity coordinates defined by the DCI specification are close to the extent that there is no practical problem, and are in a range that conforms to the DCI specification.

[White LED]
Since the two-wavelength white LED does not have a sharp peak in a wavelength region longer than 500 nm, the reproducibility of green and red is remarkably lowered, and it is difficult to realize a liquid crystal display device with high color reproducibility that can meet the DCI specification. .

Therefore, the liquid crystal display device according to the present invention uses a blue LED and a three-wavelength white LED obtained from a green phosphor and a red phosphor for backlight. Since the three-wavelength white LED is a mixture of two types of phosphors, it has a strong emission peak even in a wavelength region longer than 500 nm. Therefore, by providing a color filter substrate having a plurality of colors including red pixels, green pixels, and blue pixels that match the emission spectrum of the three-wavelength white LED, a liquid crystal display device having high color reproducibility that can be adapted to the DCI specifications. Can be obtained.

The white LED used for the backlight of the liquid crystal display device of the present invention has an emission spectrum having a first peak wavelength of 440 to 470 nm, a second peak wavelength of 520 to 550 nm, and a third peak wavelength of 610 to 700 nm. It has a peak wavelength and a fourth peak wavelength.

Further, the white LED used for the backlight of the liquid crystal display device according to the present invention has the first peak wavelength and the second peak wavelength of the emission spectrum satisfying the following (Formula 1).
85 nm ≦ λ _Gmax− λ _Bmax ≦ 90 nm (Formula 1)
λ _Bmax : first peak wavelength of the emission spectrum of the white LED λ _Gmax : second peak wavelength of the emission spectrum of the white LED

The characteristics of the emission spectrum are based on the green display chromaticity when combined with a color filter having a green pixel, which will be described later, and when the above condition is not satisfied, that is, the first peak wavelength and the first wavelength in the white LED. If the peak wavelength difference of 2 is smaller than 85 nm, the green reproducibility becomes bluish with respect to the DCI specification, whereas if it is larger than 90 nm, the green reproducibility shifts to yellow.

The red and green light emitting phosphors used for producing white LEDs having emission spectrum characteristics that contribute to the color reproducibility of the liquid crystal display device of the present invention are described below.

(Red light emitting phosphor)
As the red phosphor, a phosphor that is excited by primary light having an emission peak in the wavelength range of 440 to 470 nm and emits red light having an emission peak in the wavelength range of 610 to 700 nm is used.

As such a red light emitting phosphor, a composite fluoride phosphor activated with Mn ⁴⁺ is included, and the composite fluoride phosphor further comprises:
(A) A ₂ [MF ₅ ]: Mn ⁴⁺ in which A is selected from Li, Na, K, Rb, Cs, NH ₄ , and combinations thereof, and M is selected from Al, Ga, In, and combinations thereof,
(B) A ₃ [MF ₆ ]: Mn ⁴⁺ in which A is selected from Li, Na, K, Rb, Cs, NH ₄ , and combinations thereof, and M is selected from Al, Ga, In, and combinations thereof,
(C) Zn ₂ [MF ₇ ]: Mn ⁴⁺ in which M is selected from Al, Ga, In, and combinations thereof,
(D) A is selected from Li, Na, K, Rb, Cs, NH ₄ , and combinations thereof, A [In ₂ F ₇ ]: Mn ⁴⁺ ,
(E) A ₂ [MF ₆ ] where A is selected from Li, Na, K, Rb, Cs, NH ₄ and combinations thereof, and M is selected from Ge, Si, Sn, Ti, Zr and combinations thereof: Mn ⁴⁺ ,
(F) E [MF ₆ ]: Mn ⁴⁺ in which E is selected from Mg, Ca, Sr, Ba, Zn, and combinations thereof, and M is selected from Ge, Si, Sn, Ti, Zr, and combinations thereof. (G) Ba 0.65 Zr 0.35 F _2.70 : Mn ⁴⁺ : and (H) A ₃ [ZrF ₇ ]: Mn ⁴⁺ in which A is selected from Li, Na, K, Rb, Cs, NH ₄ , and combinations thereof. ,
Preferably, it comprises at least one phosphor selected from the group consisting of:
As a red light emitting phosphor that is often used at present, there is a red light emitting phosphor to which Eu ³⁺ is added, but in the near ultraviolet to blue region (370 to 480 nm) as compared with the phosphor of the present invention to which Mn ⁴⁺ is added. Does not absorb the light. Therefore, there is an unacceptable wavelength range due to scattering by the phosphor, which leads to light loss.

(Green light emitting phosphor)
As the green phosphor, a phosphor that is excited by primary light having an emission peak in a wavelength range of 360 to 460 nm and emits green light having an emission peak in a wavelength range of 520 to 560 nm is used.

Examples of such green phosphors include those composed of at least one phosphor selected from europium and manganese activated alkaline earth magnesium orthosilicate phosphors and europium activated sialon phosphors.

More specifically, as the green phosphor, for example, a divalent europium and manganese activated silicate phosphor substantially represented by the following (Chemical Formula 1), or the following (Chemical Formula 2) or (Chemical Formula 3): And europium-activated sialon phosphors substantially represented by:

[Chemical 1]
_{(Sr 2-x-y-} z-u Ba x Mg y Eu z Mn u) SiO 4 ··· ( Formula 1)
(Wherein x, y, z and u are values satisfying 0.1 <x <1.0 ≦ y <0.21, 0.05 <z <0.3, 0 ≦ u <0.04. is there)

[Chemical formula 2]
_{(Sr 3-x Eu x)} Si y Al z O v N w ··· ( Formula 2)
(Wherein x, y, z, v and w are 0 <x ≦ 3, 12 <y <14, 2 <z <3.5,
1 <v <3, 20 <w <22)

[Chemical formula 3]
(Si, Al) ₆ (O, N) ₈ : Eu _x (Chemical formula 3)
(Where x is a number satisfying 0 <x <0.3)

In addition, the phosphor substantially represented by (Chemical Formula 1) to (Chemical Formula 3) is expressed as a green-emitting phosphor or a yellow-emitting phosphor depending on the numerical values of x, y, z, v, and w in the formula. In the present specification, however, it is generally referred to as a green-emitting phosphor.

In the above (Chemical Formula 1), when x and u are within the above ranges, the wavelength of the green light emitted from the green phosphor powder is suitable as the green light constituting the white light used in the liquid crystal display device of the present invention. Have different wavelengths. Further, in (Chemical Formula 1), it is preferable that u is in the above range, since the Mn is sufficiently dissolved in the green phosphor powder, so that the luminous efficiency is increased. Furthermore, it is preferable that z in (Chemical Formula 1) is within the above range because the luminous efficiency of the green phosphor powder is increased.

In the above (Chemical Formula 2), when x, y, z, v, and w are within the above ranges, the wavelength of green light emitted from the green phosphor powder is the white light used in the liquid crystal display device of the present invention. It is suitable as the green light constituting.

In the above (Chemical Formula 3), when x is within the above range, the wavelength of the green light emitted from the green phosphor powder is suitable as the green light constituting the white light used in the liquid crystal display device of the present invention. .

As the green phosphor, one of the phosphors substantially represented by the above (Chemical Formula 1) to (Chemical Formula 3) can be used alone or in admixture of two or more. That is, the green phosphor is substantially represented by the divalent europium and manganese activated silicate phosphor substantially represented by (Chemical Formula 1) and (Chemical Formula 2) or (Chemical Formula 3). It can be composed of at least one green phosphor selected from europium activated sialon phosphors.

The method for producing the green phosphor is not particularly limited. For example, in the case of the phosphor of (Chemical Formula 1), the following method may be mentioned. First, barium carbonate (BaCO ₃ ), strontium carbonate (SrCO ₃ ), manganese carbonate (MnCO ₃ ), magnesium oxide (MgO), europium oxide (Eu ₂ O ₃ ), and silicon dioxide (SiO ₂ ) in (Chemical Formula 1) Predetermined amounts are weighed so as to achieve the indicated composition, and these are sufficiently mixed with the sintering aid together with the powder. This raw material mixture is put into a refractory material such as a crucible and fired at a temperature of 1100 to 1300 ° C. for about 2 to 5 hours. Thereafter, the fired product obtained is washed with pure water to remove unnecessary soluble components. Then, after passing through a pulverization step, the target green phosphor is obtained by filtration and drying. In addition, as a green fluorescent substance, the thing by the general manufacturing method other than the above, and the commercial item of the composition which satisfy | fills (Chemical formula 1)-(Chemical formula 3) can also be used.

[Color filter substrate]
Selection of the organic pigment in the photosensitive coloring composition for producing a color filter substrate having a high transmission spectral characteristic that contributes to the color reproducibility of the liquid crystal display device of the present invention, and regulation of its content (claim 4) ˜8) will be described later in Examples. (Hereinafter, the photosensitive coloring composition is abbreviated as a coloring composition as appropriate).

Hereinafter, modes of other parts belonging to the liquid crystal display device of the present invention will be described.
The transparent substrate for laying the color filter preferably has a certain degree of transmittance with respect to visible light, and more preferably has a transmittance of 80% or more. Generally, it may be one used in a liquid crystal display device, and a plastic substrate such as PET or a glass substrate is also used, but a glass substrate is usually used. In the case of attaching a light shielding pattern, a known method may be used in which a metal thin film such as chrome or a light shielding resin pattern is attached on a transparent substrate in advance.

Of the organic pigments that can be used in the color composition for forming the color layers of the red, green, and blue pixels of the color filter, other than the pigments specified in the claims of the present invention, red pigments, orange pigments, and green pigments Specific examples of yellow pigments, blue pigments, and purple pigments are indicated by color index numbers below.

Examples of red pigments include C.I. I. Pigment Red 7, 9, 14, 41, 48: 1, 48: 2, 48: 3, 48: 4, 81: 1, 81: 2, 81: 3, 97, 122, 123, 146, 149, 168, 178, 179, 180, 184, 185, 187, 192, 200, 202, 208, 210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 246, 255, 264, 272, 279 etc. are mentioned.

Examples of the orange pigment include C.I. I. Pigment Orange 36, 43, 51, 55, 59, 61, 71, 73 and the like.

Examples of green pigments include C.I. I. Pigment Green 7, 10, 35, 36, 37, 59 and the like.

Examples of yellow pigments include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 126, 127, 128, 129, 139, 147, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180, 181 182, 185, 187, 188, 193, 194, 198, 199, 213, 214 and the like.

Examples of blue pigments include C.I. I. Pigment Blue 1, 1: 2, 1: x, 9: x, 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 5, 16, 22, 24, 24: x, 56, 60, 61, 62, 80 and the like.

Examples of purple pigments include C.I. I. PigmentViolet 1, 1: x, 3, 3: 3, 3: x, 5: 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, 50, and the like.

The pigments described above can be used alone or in combination of two or more with the organic pigments specified in the claims of the present invention.

In addition, in combination with the organic pigment used in the color filter provided in the liquid crystal display device of the present invention, an inorganic pigment is combined in order to ensure good coatability, sensitivity, developability, etc. while balancing saturation and brightness. Can also be used. Inorganic pigments include yellow lead, zinc yellow, red bean (red iron oxide (III)), cadmium red, ultramarine, bitumen, chromium oxide green, cobalt green and other metal oxide powders, metal sulfide powders, metal powders, etc. Can be mentioned. Furthermore, for color matching, a dye can be contained within a range that does not lower the heat resistance.

Examples of the dye include acid dyes, oil-soluble dyes, disperse dyes, reactive dyes, and direct dyes. For example, azo dyes, benzoquinone dyes, naphthoquinone dyes, anthraquinone dyes, cyanine dyes, squarylium dyes, croconium dyes, merocyanine dyes, stilbene dyes, diarylmethane dyes, triarylmethane dyes, fluorans Dyes, spiropyran dyes, phthalocyanine dyes, indigo dyes, fulgide dyes, nickel complex dyes, and azulene dyes.

Specific examples of the dye include, but are not limited to, the following color index numbers. C. I. Solvent Yellow 2, 3, 7, 12, 13, 14, 16, 18, 19, 21, 25, 25: 1, 27, 28, 29, 30, 33, 34, 36, 42, 43, 44, 47, 56, 62, 72, 73, 77, 79, 81, 82, 83, 83: 1, 88, 89, 90, 93, 94, 96, 98, 104, 107, 114, 116, 117, 124, 130, 131, 133, 135, 141, 143, 145, 146, 157, 160: 1, 161, 162, 163, 167, 169, 172, 174, 175, 176, 179, 180, 181, 182, 183, 184, 185, 186, 187, 189, 190, 191, C.I. I. Solvent Orange 1, 2, 3, 4, 5, 7, 11, 14, 20, 23, 25, 31, 40: 1, 41, 45, 54, 56, 58, 60, 62, 63, 70, 75, 77, 80, 81, 86, 99, 102, 103, 105, 106, 107, 108, 109, 110, 111, 112, 113, C.I. I. SolventRed 1, 2, 3, 4, 8, 16, 17, 18, 19, 23, 24, 25, 26, 27, 30, 33, 35, 41, 43, 45, 48, 49, 52, 68, 69, 72, 73, 83: 1, 84: 1, 89, 90, 90: 1, 91, 92, 106, 109, 110, 118, 119, 122, 124, 125, 127, 130, 132, 135, 141, 143, 145, 146, 149, 150, 151, 155, 160, 161, 164, 164: 1, 165, 166, 168, 169, 172, 175, 179, 180, 181, 182, 195, 196, 197, 198, 207, 208, 210, 212, 214, 215, 218, 222, 223, 225, 227, 229, 230, 233, 234, 235, 23 , 238,239,240,241,242,243,244,245,247,248, C. I. SolventViolet 2, 8, 9, 11, 13, 14, 21, 21: 1, 26, 31, 36, 37, 38, 45, 46, 47, 48, 49, 50, 51, 55, 56, 57, 58, 59, 60, 61, C.I. I. Solvent Blue 2, 3, 4, 5, 7, 18, 25, 26, 35, 36, 37, 38, 43, 44, 45, 48, 51, 58, 59, 59: 1, 63, 64, 67, 68, 69, 70, 78, 79, 83, 94, 97, 98, 100, 101, 102, 104, 105, 111, 112, 122, 124, 128, 129, 132, 136, 137, 138, 139, 143, C. I. Solvent Green 1, 3, 4, 5, 7, 28, 29, 32, 33, 34, 35, C.I. I. Solvent Brown 1, 3, 4, 5, 12, 20, 22, 28, 38, 41, 42, 43, 44, 52, 53, 59, 60, 61, 62, 63, C.I. I. Solvent Black 3, 5, 5: 2, 7, 13, 22, 22: 1, 26, 27, 28, 29, 34, 35, 43, 45, 46, 48, 49, 50, C.I. I. Acid Red 6, 11, 26, 60, 88, 111, 186, 215, C.I. I. AcidGreen 25, 27, C.I. I. Acid Blue 22, 25, 40, 78, 92, 113, 129, 167, 230, C.I. I. Acid Yellow 17, 23, 25, 36, 38, 42, 44, 72, 78, C.I. I. Basic Red 1, 2, 13, 14, 22, 27, 29, 39, C.I. I. BasicGreen 3, 4, C.I. I. BasicBlue 3, 7, 9, 17, 41, 66, C.I. I. BasicViolet 1, 3, 18, 39, 66, C.I. I. Basic Yellow 11, 23, 25, 28, 41, C.I. I. DirectRed 4, 23, 31, 75, 76, 79, 80, 81, 83, 84, 149, 224, C.I. I. DirectGreen 26, 28, C.I. I. DirectBlue 71, 78, 98, 106, 108, 192, 201, C.I. I. DirectViolet 51, C.I. I. Direct Yellow 26, 27, 28, 33, 44, 50, 86, 142, C.I. I. Direct Orange 26, 29, 34, 37, 72, C.I. I. SulfurRed 5, 6, 7, C.I. I. SulfurGreen 2, 3, 6, C.I. I. SulfurBlue 2, 3, 7, 9, 13, 15, C.I. I. Sulfur Violet 2, 3, 4, C.I. I. Sulfur Yellow 4, C.I. I. VatRed 13, 21, 23, 28, 29, 48, C.I. I. VatGreen 3, 5, 8, C.I. I. VatBlue 6, 14, 26, 30, C.I. I. VatViolet 1, 3, 9, 13, 15, 16, C.I. I. Vat Yellow 2, 12, 20, 33, C.I. I. Vat Orange 2, 5, 11, 15, 18, 20, C.I. I. Azoic Coupling Component 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 32, 37, 41, 48, C.I. I. Reactive Red 8, 22, 46, 120, C.I. I. Reactive Blue 1, 2, 7, 19, C.I. I. Reactive Violet 2, 4, C.I. I. Reactive Yellow 1, 2, 4, 14, 16, C.I. I. Reactive Orange 1, 4, 7, 13, 16, 20, C.I. I. Disperse Red 4, 11, 54, 55, 58, 65, 73, 127, 129, 141, 196, 210, 229, 354, 356, C.I. I. DisperseBlue 3, 24, 79, 82, 87, 106, 125, 165, 183, C.I. I. DisperseViolet 1, 6, 12, 26, 27, 28, C.I. I. Disperse Yellow 3, 4, 5, 7, 23, 33, 42, 60, 64, C.I. I. Disperse Orange 13, 29, 30. These dyes can be used alone or in combination of two or more.

The transparent resin used for the coloring composition is a resin having a transmittance of preferably 80% or more, more preferably 95% or more in the entire wavelength range of 400 to 700 nm in the visible light region. The transparent resin includes a thermoplastic resin, a thermosetting resin, and a photosensitive resin. If necessary, the transparent resin can be used alone or in admixture of two or more monomers or oligomers that are precursors thereof that are cured by irradiation with radiation to produce a transparent resin.

Examples of the thermoplastic resin include butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyurethane resin, and polyester resin. , Acrylic resins, alkyd resins, polystyrene, polyamide resins, rubber resins, cyclized rubber resins, celluloses, polyethylene, polybutadiene, polyimide resins, and the like. Examples of the thermosetting resin include epoxy resins, benzoguanamine resins, rosin-modified maleic acid resins, rosin-modified fumaric acid resins, melamine resins, urea resins, and phenol resins.

Examples of the photosensitive resin include (meth) acrylic compounds having a reactive substituent such as an isocyanate group, an aldehyde group, and an epoxy group on a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, or an amino group, A resin obtained by reacting an acid and introducing a photocrosslinkable group such as a (meth) acryloyl group or a styryl group into the linear polymer is used. In addition, linear polymers containing acid anhydrides such as styrene-maleic anhydride copolymer and α-olefin-maleic anhydride copolymer can be obtained from (meth) acrylic compounds having hydroxyl groups such as hydroxyalkyl (meth) acrylate. Half-esterified products are also used.

Examples of polymerizable monomers that can be used as a photocrosslinking agent include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and ethylene oxide-modified trimethylolpropane tri (meth). Representative examples include various acrylic esters and methacrylic esters such as acrylate and propylene oxide-modified trimethylolpropane tri (meth) acrylate. These can be used alone or in combination of two or more, and for the purpose of keeping the photocurability properly, other polymerizable monomers and oligomers can be mixed and used as necessary.

Other polymerizable monomers and oligomers include methyl (meth) acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, cyclohexyl (meth) acrylate, β-carboxyethyl (Meth) acrylate, diethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate , Pentaerythritol tri (meth) acrylate, 1,6-hexanediol diglycidyl ether di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, Neopentyl glycol diglycidyl ether di (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tricyclodecanyl (meth) acrylate, ester acrylate, methylolated melamine (meth) acrylate, epoxy (meth) acrylate, Various acrylic acid esters and methacrylic acid esters such as urethane acrylate, (meth) acrylic acid, styrene, vinyl acetate, hydroxyethyl vinyl ether, ethylene glycol divinyl ether, pentaerythritol trivinyl ether, (meth) acrylamide, N-hydroxymethyl (meth) Examples include acrylamide, N-vinylformamide, acrylonitrile and the like. Also about these, it can use individually or in mixture of 2 or more types.

When the composition is cured by ultraviolet irradiation, a photopolymerization initiator or the like is added to the coloring composition. As photopolymerization initiators, 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- Acetophenone compounds such as hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzyl Benzoin compounds such as dimethyl ketal, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, 3 Benzophenone compounds such as 3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, 2,4- Thioxanthone compounds such as diethylthioxanthone, 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, 2- (p-methoxyphenyl) -4,6 -Bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) -s-triazine, 2-piperonyl-4,6-bis (trichloromethyl) -s-triazine 2,4-bis (trichloromethyl) -6-styryl-s-triazine, 2- (naphth-1-yl) -4,6-bis (trichloro) Methyl) -s-triazine, 2- (4-methoxy-naphth-1-yl) -4,6-bis (trichloromethyl) -s-triazine, 2,4-trichloromethyl- (piperonyl) -6-triazine, Triazine compounds such as 2,4-trichloromethyl (4′-methoxystyryl) -6-triazine, 1,2-octanedione, 1- [4- (phenylthio)-, 2- (O-benzoyloxime)], Oxime ester compounds such as O- (acetyl) -N- (1-phenyl-2-oxo-2- (4′-methoxy-naphthyl) ethylidene) hydroxylamine, bis (2,4,6-trimethylbenzoyl) phenyl Phosphine compounds such as phosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 9,10-phenanthrenequinone, camphorquinone, ethyl anthraquino Quinone compounds such as borate compounds, carbazole compounds, imidazole compounds, titanocene compounds and the like. These photopolymerization initiators can be used alone or in combination of two or more. The amount of the photopolymerization initiator used is preferably 0.5 to 50 wt%, more preferably 3 to 30 wt% based on the total solid content of the colored composition.

Further, as sensitizers, triethanolamine, methyldiethanolamine, triisopropanolamine, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, 2-dimethylaminoethyl benzoate, 4 2-Dimethylaminobenzoic acid 2-ethylhexyl, N, N-dimethylparatoluidine, 4,4'-bis (dimethylamino) benzophenone, 4,4'-bis (diethylamino) benzophenone, 4,4'-bis (ethylmethylamino) ) Amine compounds such as benzophenone can also be used in combination. These sensitizers can be used alone or in combination. The amount of the sensitizer used is preferably 0.5 to 60 wt%, more preferably 3 to 40 wt% based on the total amount of the photopolymerization initiator and the sensitizer.

Furthermore, the coloring composition can contain a polyfunctional thiol that functions as a chain transfer agent. The polyfunctional thiol may be a compound having two or more thiol groups. For example, hexanedithiol, decanedithiol, 1,4-butanediol bisthiopropionate, 1,4-butanediol bisthioglycolate, ethylene Glycol bisthioglycolate, ethylene glycol bisthiopropionate, trimethylolpropane tristhioglycolate, trimethylolpropane tristhiopropionate, trimethylolpropane tris (3-mercaptobutyrate), pentaerythritol tetrakisthioglycolate, Pentaerythritol tetrakisthiopropionate, tris (2-hydroxyethyl) isocyanurate trimercaptopropionate, 1,4-dimethylmercaptobenzene, 2,4,6-trimercapto-s-to Azine, 2- (N, N- dibutylamino) -4,6-dimercapto -s- triazine. These polyfunctional thiols can be used alone or in combination of two or more.

Moreover, as a thermal crosslinking agent contained as needed, a melamine resin, an epoxy resin, etc. are mentioned, for example. Examples of the melamine resin include alkylated melamine resins (methylated melamine resin, butylated melamine resin, etc.), mixed etherified melamine resins, and the like, which may be a high condensation type or a low condensation type. Examples of the epoxy resin include glycerol / polyglycidyl ether, trimethylolpropane / polyglycidyl ether, resorcin / diglycidyl ether, neopentyl glycol / diglycidyl ether, 1,6-hexanediol / diglycidyl ether, ethylene glycol (polyethylene). Glycol) and diglycidyl ether. Any of these may be used alone or in admixture of two or more.

The coloring composition can contain an organic solvent as necessary. Examples of the organic solvent include cyclohexanone, ethyl cellosolve acetate, butyl cellosolve acetate, 1-methoxy-2-propyl acetate, diethylene glycol dimethyl ether, ethylbenzene, ethylene glycol diethyl ether, xylene, ethyl cellosolve, methyl-n amyl ketone, propylene glycol monomethyl ether toluene, Examples include methyl ethyl ketone, ethyl acetate, methanol, ethanol, isopropyl alcohol, butanol, isobutyl ketone, petroleum solvent, and the like. These may be used alone or in combination.

The pixel may be formed on the transparent substrate by any known method such as a photolithography method, a printing method, an ink jet method, and an etching method. However, in consideration of high definition, controllability of spectral characteristics, reproducibility, etc., the photolithography method is preferable, and a colored composition in which a pigment is dispersed in a suitable solvent together with a photoinitiator and a polymerizable monomer in a transparent resin. Is formed on a transparent substrate to form a colored layer, and the process of forming a pixel of one color by pattern exposure and development of the colored layer is repeated for each color to produce a color filter. There are various methods such as a mill base, three rolls, and a jet mill for dispersing the pigment as the colorant and the transparent resin, and the method is not particularly limited.

A series of steps such as photolithography is performed by changing the photosensitive coloring composition and pattern and repeating the necessary number of times to obtain a colored pattern in which a necessary number of colors are combined, that is, a color filter substrate having a plurality of color pixels. Can do.

Examples according to the present invention will be described together with comparative examples. The embodiment is not limited to this within the scope not departing from the gist of the present invention.

[Production of backlight]
A white LED having the structure of FIG. 3 was produced as follows.
A molten polyphthalamide resin is poured from a gate on the lower surface facing the main surface of the housing into a mold in which a pair of positive and negative external electrodes are inserted and closed, and the housing is cured. Formed. The housing has an opening that can accommodate the light emitting element, and is integrally formed so that the positive and negative external electrodes are exposed from one main surface from the bottom of the opening.

The outer lead portions of the positive and negative external electrodes exposed from the side surface of the housing are bent inward at both ends opposite to the light emitting surface. A blue LED element made of a gallium nitride compound semiconductor was die-bonded to the bottom surface of the opening formed in this way with an epoxy resin and electrically connected to each external electrode with a wire. The blue LED element emits light as the first peak wavelength in the emission spectrum of the white LED used in the present invention.

Next, a red phosphor powder having an average particle diameter of 5 μm and a green phosphor powder having an average particle diameter of 5 μm are respectively selected from the above-mentioned explanations of (red light-emitting phosphor) and (green light-emitting phosphor). A total of 70 wt% of these phosphor powders and 30 wt% of silicone resin were mixed to obtain a translucent resin.

The translucent resin thus obtained was filled in the housing opening and heat-treated at 70 ° C. to 150 ° C. to cure the silicone resin and obtain white LEDs (1) to (4).

White LED- (1)-(4) was each used as the light source, and the edge light type backlights (1)-(4) of the structure shown in FIG. 2 were produced by a well-known method. Table 1 shows the characteristics of the backlights (1) to (4).

Obtained backlights (1) to (4)

FIG. 4 shows relative emission spectrum intensities of the backlights (1) and (2) with the blue emission intensity being 1, and the blue emission intensities of the backlights (3) and (4). The relative emission spectrum intensity set to 1 is shown in FIG.

A backlight (5) was produced using a pseudo white LED belonging to the chromaticity rank b7 of Nichia Corporation as a light source. FIG. 6 shows the relative emission spectrum intensity of the backlight (5) with the blue emission intensity being 1.

[Preparation of photosensitive coloring composition]
The following were used for the pigment used as a coloring agent for producing the coloring composition used for preparation of the color filter board | substrate of an Example and a comparative example.
Red pigment: C.I. I. Pigment Red 254 (“Ilgar Forred B-CF” manufactured by Ciba Specialty Chemicals), C.I. I. Pigment Red 177 (“CROMOPHTAL RED A2B” manufactured by Ciba Specialty Chemicals) and C.I. I. Pigment Yellow 150 (Bayer's “Funcheon First Yellow Y-5688”)

Green pigment: C.I. I. Pigment Green 58 (Dainippon Ink & Chemicals, Inc. “Phthacocyanine Green A110”), C.I. I. Pigment
Yellow 138 ("PALIOTOL YELLOW K0 961HD" manufactured by BASF, and CI Pigment Yellow 150 ("Funchon First Yellow Y-5688" manufactured by Bayer))

Blue pigment: C.I. I. Pigment Blue 15: 6 (“Lionol Blue ES” manufactured by Toyo Ink Manufacturing Co., Ltd.), C.I. I. Pigment Violet 23 (manufactured by BASF “Paliogen Violet 5890”)

As the red coloring composition used for forming the red coloring layer in the color filter, as shown in Table 2, red coloring compositions A and B having a pigment ratio in the total organic pigment in the solid content of the red photosensitive coloring composition are prepared. did.

As the green coloring composition used for forming the green coloring layer in the color filter, as shown in Table 3, green coloring compositions C to H having a pigment ratio in the total organic pigment in the solid content of the green photosensitive coloring composition are prepared. did.

As the blue coloring composition used for forming the blue coloring layer in the color filter, as shown in Table 4, blue coloring compositions I to K having a pigment ratio in the total organic pigment in the solid content of the blue photosensitive coloring composition are prepared. did.

The dye A of Table 4 used the xanthene dye which is a mixture of the compounds 1-10 represented by (chemical structural formula 1)-(chemical structural formula 10).
Chemical structural formula of compound 1 contained in dye A (chemical structural formula 1)
Chemical structural formula of compound 2 contained in dye A (chemical structural formula 2)
Chemical structural formula of compound 3 contained in dye A (chemical structural formula 3)
Chemical structural formula of compound 4 contained in dye A (chemical structural formula 4)
Chemical structural formula of compound 5 contained in dye A (chemical structural formula 5)
Chemical structural formula of compound 6 contained in Dye A (chemical structural formula 6)
Chemical structural formula of compound 7 contained in dye A (chemical structural formula 7)
Chemical structural formula of compound 8 contained in Dye A (chemical structural formula 8)
Chemical structural formula of compound 9 contained in Dye A (chemical structural formula 9)
Chemical structural formula of the compound 10 contained in the dye A (chemical structural formula 10)

[Production of color filter substrate and liquid crystal display device]
(Common conditions)
About each coloring composition produced with the pigment ratio of Tables 2-4, the upper limit of the density | concentration of all the organic pigments with respect to solid content in a coloring composition is 50%, the upper limit of the film thickness after drying is set to 5.0 micrometers, When combined with the backlights shown in Examples and Comparative Examples, the chromaticity of the red colored layer is x = 0.680, the chromaticity of the green colored layer is y = 0.690, and the chromaticity of the blue colored layer is y = With the goal of achieving 0.060, the concentration and film thickness of all pigments were adjusted, and a three-color color filter substrate was produced by a known production method. When the concentration and film thickness of all pigments were at the upper limit, the value closest to the target was taken as the value at the upper limit. The chromaticity target is based on the DCI specification.

(Examples 1-4)
As the coloring composition, A was used for the red coloring composition, C and F were used for the green coloring composition, I and J were used for the blue coloring composition, and a three-color color filter substrate was prepared by the above method. Furthermore, liquid crystal display devices were produced by combining these color filter substrates and the backlight (1), and Examples 1 to 4 were obtained.

(Examples 5 to 8)
As the coloring composition, A was used for the red coloring composition, C and F were used for the green coloring composition, I and J were used for the blue coloring composition, and a three-color color filter substrate was prepared by the above method. Furthermore, a liquid crystal display device was produced by combining these color filter substrates and the backlight (2), and Examples 5 to 8 were obtained.

<Comparative Examples 1-4>
As the coloring composition, B was used as the red coloring composition, D, E, G, and H were used as the green coloring composition, and K was used as the blue coloring composition, and a three-color filter substrate was prepared by the above method. Furthermore, these color filter substrates and the backlight (1) were combined to produce a liquid crystal display device, which was referred to as Comparative Examples 1 to 4.

<Comparative Examples 5-12>
As the coloring composition, A was used for the red coloring composition, C, D, F, and G were used for the green coloring composition, and I and J were used for the blue coloring composition, and a three-color color filter substrate was prepared by the above method. Further, a liquid crystal display device was produced by combining these color filter substrates and the backlight (3), and Comparative Examples 5 to 12 were obtained.

<Comparative Examples 13-20>
As the colored composition, A was used as the red colored composition, C, E, F, and H were used as the green colored composition, and I and J were used as the blue colored composition, and a three-color color filter substrate was prepared by the above method. Furthermore, a liquid crystal display device was produced by combining these color filter substrates and the backlight (4), and Comparative Examples 13 to 20 were obtained.

<Comparative Examples 21-24>
As the coloring composition, A was used as the red coloring composition, C and H were used as the green coloring composition, and I and J were used as the blue coloring composition, and a three-color color filter substrate was prepared by the above method. Further, a liquid crystal display device was manufactured by combining these color filter substrates and the backlight (5), and Comparative Examples 21 to 24 were obtained.

<Evaluation items>
(Backlight)
In Table 1, there are a first peak wavelength at 440 nm to 470 nm, a second peak wavelength at 520 nm to 550 nm, a third peak wavelength and a fourth peak wavelength at 610 nm to 700 nm, and the first peak wavelength. The case where the interval from the first peak wavelength to the second peak wavelength is 85 nm or more and 90 nm or less is marked with ◯, and the case where none of these conditions is satisfied is marked with ×.

(Coloring composition pigment ratio)
In Table 2, the case where the red coloring composition contains PR254 and PR177 and the pigment ratio is PR254 of 60% or more and PR177 of 30% or less is indicated as ◯, and the case where it is not is indicated as x.
In Table 3, when the green coloring composition contains PG58 and PY138 and PG58 is 40% or more and 65% or less as a pigment ratio,
Alternatively, the case where PG58 and PY150 are included and PG58 is 60% or more and 80% or less as the pigment ratio is indicated as ◯, and the case where it is not is indicated as ×.
In Table 4, the case where the blue coloring composition contains PB15: 6 and PB15: 6 is 80% or more as a pigment ratio is indicated as ◯, and the case where it is not is indicated as x.

(Chromaticity value)
Using the microscopic photometric device OSP-2000 (manufactured by Olympus Optical Co., Ltd.), the chromaticity and brightness of the red pixel, the green pixel, and the blue pixel were measured for each of the manufactured liquid crystal display devices.
The case where the chromaticity value of the red colored layer was 0.314 <y <0.327 and x> 0.666 was rated as ◯, and the case where it was not was rated as x.
The case where the chromaticity value of the green colored layer was 0.260 <x <0.270 and y> 0.676 was evaluated as ◯, and the case where it was not was evaluated as x.
The case where the blue color layer chromaticity value was x <0.155 and y <0.0618 was rated as ◯, and the case where it was not was rated as x.

The reason for the above evaluation criteria will be described. FIG. 7 shows the chromaticity coordinates of the CDI specification. In FIG. 7, the solid line is a line segment connecting the three colors, and the broken line is an auxiliary line obtained by extending them. Here, considering the relationship between the allowable range and the color gamut when deviating from the CDI specification, in red (R), the y coordinate should be considered the upper and lower allowable ranges, but the x coordinate is The shift to the increasing method is a direction to widen the color reproduction range. Therefore, it is considered that the lower limit should be considered for the x coordinate of R.

Similarly, in green (G), it is considered that the upper and lower limit allowable ranges should be taken into consideration for the x coordinate, but the shift to the method of increasing the y coordinate is in the direction of expanding the color reproduction range. Therefore, it is considered that the lower limit of the y coordinate of G should be considered.

In blue (B), a shift to a method in which both the x and y coordinates are reduced is a direction in which the color gamut is expanded. Therefore, it is considered that the upper limit should be considered for both x and y coordinates of B.

The above judgment criteria are the above-mentioned upper / lower limit, upper limit, and lower limit to be considered. For R and G, the upper and lower limits are less than ± 2% of the CDI specification value, and the lower limit is less than −2%. A larger deviation is indicated by x, and the upper limit of B is a numerical value of the allowable range so that a deviation of less than 3% is judged as ◯ and a deviation larger than that is judged as x because the CDI specification value (denominator) is small. is there.

<Evaluation results>
The production conditions and evaluation results of Examples 1 to 8 are summarized in Table 5. Similarly, Comparative Examples 1 to 4 are summarized in Table 6, Comparative Examples 5 to 12 are summarized in Table 7, and Comparative Examples 13 to 20 are summarized. Table 8 collectively shows Comparative Examples 21 to 24 in Table 9.

Summary of Examples 1-8

Summary of Comparative Examples 1-4

Summary of Comparative Examples 5-12

Summary of Comparative Examples 13-20

Summary of Comparative Examples 21-24

As shown in the examples in Table 5, when the color layers of the backlight and the color filter satisfy the conditions specified in the claims of the present invention, it is possible to achieve high color reproducibility that meets the DCI specifications. Further, as shown in Comparative Examples in Tables 6, 7, 8, and 9, when the color layers of the backlight and the color filter are out of the conditions specified in the claims of the present invention, it is difficult to meet the DCI specification. It is.

As described above, the liquid crystal display device of the present invention has high color reproducibility that can be adapted to the DCI specification. In addition, since the LED backlight used in the liquid crystal display device of the present invention combines a blue LED with a red phosphor and a green phosphor, it can be manufactured at a lower cost than a three-color LED.

DESCRIPTION OF SYMBOLS 1 ... Color filter substrate 2 ... Liquid crystal layer 3 ... TFT array substrate 4 ... Backlight 5 ... Liquid crystal panel 7 ... Color filter 8 ... Overcoat 9, 10, 31, ..White LED
DESCRIPTION OF SYMBOLS 11 ... Polarizing film 12 ... Adhesive layer 13, 33 ... Light guide plate 14, 34 ... Reflecting plate 15 ... Substrate 16 ... TFT array part 17 ... Substrate 20 ... Liquid crystal Display device 32 ... substrate 35 ... metal frame (or resin frame)
36 ... Diffusion sheet 37, 38 ... Prism sheet 51 ... Light emitting element mounting housing 52 ... Light emitting element 53 ... Luminescent phosphor 54 ... Translucent resin 55 ... First Wire 56 ... 1st external electrode 57 ... 2nd wire 58 ... 2nd external electrode 59 ... Light reflecting material 60 ... White LED

Claims (8)

A backlight having a white LED mixed with a combination of a blue LED, a red phosphor and a green phosphor, and a color filter having a plurality of colored pixels including a red pixel, a green pixel and a blue pixel on a transparent substrate. In the liquid crystal display device, the emission spectrum of the white LED has a first peak wavelength in the range of 440 nm to 470 nm, a second peak wavelength in the range of 520 nm to 550 nm, a third peak wavelength in the range of 610 nm to 700 nm and the fourth peak. Having a peak wavelength of
And chromaticity coordinates (x, y) in the XYZ color system of the liquid crystal display device are
The red pixel is in the common part of 0.314 <y <0.327 and x>0.666;
The green pixel is in the intersection of 0.260 <x <0.270 and y>0.676;
The liquid crystal display device according to claim 1, wherein the blue pixel is in a common part of x <0.155 and y <0.0618. 2. The liquid crystal display device according to claim 1, wherein the first peak wavelength and the second peak wavelength of the emission spectrum of the white LED satisfy the following (Equation 1).
85 nm ≦ λ _Gmax− λ _Bmax ≦ 90 nm (Formula 1)
λ _Bmax : first peak wavelength of the emission spectrum of the white LED λ _Gmax : second peak wavelength of the emission spectrum of the white LED 3. The liquid crystal display device according to claim 1, wherein the red phosphor is a phosphor material including a composite fluoride phosphor activated with Mn ^{4+. 4} . The organic pigment in the red photosensitive coloring composition used for forming the red pixel of the color filter is at least C.I. I. 60% by weight or more of the total organic pigment in the solid content of the red photosensitive coloring composition containing C.I. I. The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a pigment number of 254. The organic pigment in the red photosensitive coloring composition used for forming the red pixel of the color filter is at least C.I. I. Pigment number 254 and C.I. I. 60% by weight or more of the total organic pigment in the solid content of the red photosensitive coloring composition containing C.I. I. Pigment number 254, 30 wt% or less is C.I. I. The liquid crystal display device according to claim 1, which has a pigment number of 177. The organic pigment in the green photosensitive coloring composition used for forming the green pixel of the color filter is at least C.I. I. Pigment number 58 and C.I. I. Pigment Number 138, and 40 wt% or more and 65 wt% or less of the total organic pigment in the solid content of the green photosensitive coloring composition is C.I. I. The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a pigment number of 58. The organic pigment in the green photosensitive coloring composition used for forming the green pixel of the color filter is at least C.I. I. Pigment number 58 and C.I. I. Pigment Number 150, and 60 wt% or more and 80 wt% or less of the total organic pigment in the solid content of the green photosensitive coloring composition is C.I. I. The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a pigment number of 58. The organic pigment in the blue photosensitive coloring composition used for forming the blue pixel of the color filter is at least C.I. I. 80% by weight or more of the total organic pigment in the solid content of the blue photosensitive coloring composition containing CI Pigment Number 15: 6. I. The liquid crystal display device according to claim 6 or 7, wherein the pigment number is 15: 6.