JP2016126064A - Filter and liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter that can sufficiently improve color reproducibility of a liquid crystal display unit when disposed on a viewing side of the liquid crystal display unit, and a liquid crystal display device having sufficiently improved color reproducibility.SOLUTION: The filter is to be disposed on a viewing side of a liquid crystal display unit and exhibits the following characteristics. An absorption spectrum of the filter to light at wavelengths from 300 to 1000 nm has an absorption peak having a maximum absorption wavelength in a wavelength region shorter than a maximum emission wavelength of a red emission peak and longer than a maximum emission wavelength of a green emission peak included in an emission spectrum emitted from a surface on a viewing side of the liquid crystal display unit; and an absorption peak having a maximum absorption wavelength in a wavelength region shorter than a maximum emission wavelength of the green emission peak and longer than a maximum emission wavelength of a blue emission peak of the above emission spectrum and/or a wavelength region from the maximum emission wavelength of the blue emission peak of the emission spectrum down to 400 nm inclusive.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a filter and a liquid crystal display device arranged on the viewing side of a liquid crystal display body.

  Conventionally, in a display body that displays an image of an image display device, a so-called display panel, the display body itself alone has poor color purity and insufficient color reproducibility, in other words, the color gamut is narrow. Attempts have been made to improve the color reproducibility by enlarging the image.

  Among these, the liquid crystal display used for the liquid crystal display device basically has a configuration in which a backlight and a liquid crystal panel including a color filter are laminated, and the improvement in color reproducibility as described above is mainly performed. It was done by adjusting the color filter.

  In addition, a technique for improving color reproducibility by arranging a filter having a color tone correction function on the viewing side of the liquid crystal display has been developed. For example, in Patent Document 1, paying attention to an emission peak at a wavelength of 585 nm, which adversely affects the color reproducibility of a cold cathode tube used as a backlight of a liquid crystal display, an optical filter having absorption near this wavelength is displayed on a liquid crystal display. Attempts have been made to place it on the viewing side of the body.

  However, in recent years, LEDs capable of realizing high luminance and energy saving have been used instead of cold cathode fluorescent tubes as backlights for liquid crystal displays. When the backlight is an LED, even if the liquid crystal display is combined with the optical filter described in Patent Document 1, an effect of improving the color reproducibility is hardly expected. Therefore, there has been a demand for an optical filter for a liquid crystal display that can improve color reproducibility widely regardless of the type of backlight.

JP 2007-108535 A

  The present invention has been made from the above viewpoint, and a filter capable of sufficiently improving the color reproducibility of the liquid crystal display body and the color reproducibility sufficiently improved by disposing it on the viewing side of the liquid crystal display body. An object is to provide a liquid crystal display device.

The filter of the present invention is a filter disposed on the viewing side of the liquid crystal display body, and the absorption spectrum of the filter with respect to light having a wavelength of 300 to 1000 nm is:
The emission spectrum emitted from the viewing side surface of the liquid crystal display body has an absorption peak having a maximum absorption wavelength in a wavelength region less than the maximum emission wavelength of the red emission peak and the maximum emission wavelength of the green emission peak, and the emission spectrum Less than the maximum emission wavelength of the green emission peak, the absorption peak having the maximum absorption wavelength in the wavelength region exceeding the maximum emission wavelength of the blue emission peak, and / or the maximum emission wavelength of the blue emission peak of the emission spectrum of 400 nm or more. Have an absorption peak having a maximum absorption wavelength.

The liquid crystal display device of the present invention has a liquid crystal display body and the filter of the present invention disposed on the viewing side of the liquid crystal display body.
In this specification, the viewing side refers to the side on which a person viewing the liquid crystal display is present, and the side opposite to the viewing side is referred to as the non-viewing side.

  By disposing the filter of the present invention on the viewing side of the liquid crystal display body, the color reproducibility of the liquid crystal display body can be sufficiently improved. In addition, according to the present invention, a liquid crystal display device with sufficiently improved color reproducibility can be provided.

It is a figure which shows the absorption spectrum of an example of embodiment of the filter of this invention. It is a figure which shows the absorption spectrum of another example of embodiment of the filter of this invention. It is sectional drawing which shows an example of embodiment of the filter of this invention. It is sectional drawing which shows another example of embodiment of the filter of this invention. It is sectional drawing which shows an example of embodiment of the liquid crystal display device of this invention using the filter shown in FIG. It is sectional drawing which shows another example of embodiment of the liquid crystal display device of this invention using the filter shown in FIG.

  Embodiments of a filter and a liquid crystal display device of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to the following embodiment.

[filter]
The filter of this invention is a filter arrange | positioned at the visual recognition side of a liquid crystal display body, Comprising: The light absorption spectrum with respect to the light of the wavelength of 300-1000 nm of the said filter respond | corresponds to the emission spectrum which the visual recognition side surface of the said liquid crystal display body emits. In addition to the following absorption peak (1), it has an absorption peak (2) and / or an absorption peak (3). Hereinafter, the emission spectrum emitted from the viewing side surface of the liquid crystal display is referred to as “emission spectrum of the liquid crystal display”. In addition, both the maximum emission wavelength and the maximum absorption wavelength may be indicated by “λmax”.

(1) The wavelength region of the emission spectrum of the liquid crystal display that is less than the maximum emission wavelength of the red emission peak and that exceeds the maximum emission wavelength of the green emission peak (hereinafter also referred to as “first wavelength region”, indicated by “λ1”) There is also an absorption peak having a maximum absorption wavelength.
(2) The wavelength range of the emission spectrum of the liquid crystal display that is less than the maximum emission wavelength of the green emission peak and the maximum emission wavelength of the blue emission peak (hereinafter also referred to as “second wavelength range”, indicated by “λ2”) There is also an absorption peak having a maximum absorption wavelength.
(3) Maximum absorption in the wavelength region of 400 nm or more of the maximum emission wavelength of the blue emission peak of the emission spectrum of the liquid crystal display (hereinafter also referred to as “third wavelength region”, sometimes indicated as “λ3”). Absorption peak with wavelength.

  Here, the absorption peak referred to in the present invention refers to a region that forms a sharp waveform such that the half-value width is 50 nm or less in the absorption spectrum. That is, the term “absorption peak” is not applied to a broad light absorption waveform in which the half width exceeds 50 nm.

  FIG. 1 and FIG. 2 show an absorption spectrum of an example of the filter according to the present invention and another example, respectively, together with an emission spectrum of a liquid crystal display used in combination. 1 and 2, the absorption spectrum of the filter is indicated by a solid line, and the emission spectrum of a liquid crystal display used in combination is indicated by a broken line. 1 and FIG. 2 are the same liquid crystal display (product name: BRAVIA (HX920 series, KDL-46HX920) manufactured by Sony Corporation).

  The filter showing the absorption spectrum in FIG. 1 is a filter having one absorption peak having a maximum absorption wavelength in each of the first, second, and third wavelength regions in the absorption spectrum. Further, the filter showing the absorption spectrum in FIG. 2 has one absorption peak having a maximum absorption wavelength in each of the first and second wavelength regions, and the maximum absorption wavelength in the third wavelength region. Is a filter having no absorption peak.

  Table 1 shows the maximum emission wavelengths of the red, green, and blue emission peaks of the liquid crystal display shown in FIGS. 1 and 2, and the first to third wavelength regions in the absorption spectrum of the filter used in combination. Show. Table 2 shows the maximum absorption wavelengths of the first to third wavelength regions and the absorption peaks of the filters shown in FIGS. 1, 2 and Table 1, λmax (R) is the maximum emission wavelength of the red emission peak in the emission spectrum of the liquid crystal display, and λmax (G) is the maximum emission wavelength of the green emission peak in the emission spectrum. (B) shows the maximum emission wavelength of the blue emission peak in the emission spectrum. 1, 2 and Table 2, λmax (1), λmax (2) and λmax (3) are absorption peaks existing in the first, second and third wavelength regions in the absorption spectrum of the filter. The maximum absorption wavelength is shown respectively.

  Hereinafter, the abbreviations λmax (1), λmax (2), λmax (3), λmax (R), λmax (G), and λmax (B) are used as necessary in the same manner as described above.

  The filter of the present invention may be, for example, a filter having one absorption peak having a maximum absorption wavelength in each of the first, second, and third wavelength regions as shown in FIG. The filter may have one absorption peak having a maximum absorption wavelength in each of the first and second wavelength regions, as shown, and although not shown, the maximum absorption wavelength in each of the first and third wavelength regions It may be a filter having one absorption peak each having. Each of the first, second, and third wavelength regions may independently have one absorption peak having a maximum absorption wavelength, or a plurality of absorption peaks.

  Such a filter of the present invention can absorb light emission (hereinafter also referred to as “unnecessary light”) unfavorable for color reproducibility in the emission spectrum of the liquid crystal display to be combined in a balanced manner. Thereby, compared with the emission spectrum of a liquid crystal display body, the light emission spectrum after light-emitting from the visual recognition side of the liquid crystal display body and passing through the filter has improved color reproducibility.

  The color reproducibility of the image display device is, for example, the same color gamut area of the image display device with respect to the color gamut area of the DCI standard in the xy color coordinates according to the CIE XYZ color system (JIS Z8701 (1999)). It can be evaluated at a rate of In this specification, the ratio of the color gamut area is referred to as “DCI color gamut area ratio” and is expressed as a percentage. When the filter of the present invention is combined with a liquid crystal display body, the DCI color gamut area ratio of the emission spectrum can be increased to such a level that it can be clearly differentiated when viewed with the human eye as compared with the case of only the liquid crystal display body.

  Here, the DCI standard is a color reproducibility standard defined for high-resolution digital cinema, and color expression is made by XYZ (JIS Z8701 (1999)) which is a CIE1931 color coordinate. The DCI standard red, green, and blue color coordinates are red coordinates (x = 0.680, y = 0.320), green coordinates (x = 0.265, y = 0.690), and blue coordinates (x = 0). .150, y = 0.060). The color gamut area of the DCI standard is an area of a triangle (hereinafter also referred to as a color triangle) connecting the chromaticity coordinates (x, y) of the red, green, and blue, and is 0.152.

  In the present invention, among the three vertices of the color triangle of the liquid crystal display device, for example, when the color gamut area is increased in the red coordinate direction, the color gamut expansion is simply referred to as the red direction. The color gamut expansion can be realized, for example, by simply enlarging in one specific color direction. However, even in such a case, normally, along with the color gamut expansion in the liquid crystal display device, the transmitted color of the C light source in the filter is determined from a predetermined setting. Shift. When the deviation exceeds a predetermined range, it is preferable to perform color tone correction simultaneously.

  Color tone correction corresponds to adjusting the transmittance of the filter and the transmitted color of the C light source within a predetermined range. Here, the transmittance is the transmittance of the filter with respect to panel emission, and is preferably 75% or more, and more preferably 80% or more. The preferable range of the transmitted color of the C light source in the filter is x from 0.280 to 0.340, y is from 0.285 to 0.345, and more preferably x is from 0.295 to 0.325. , Y is 0.300 or more and 0.330 or less.

  Hereinafter, the absorption peak in the 1st-3rd wavelength range in the absorption spectrum with respect to the light of wavelength 300-1000nm of the filter of embodiment is demonstrated in detail.

(1) Absorption peak having a maximum absorption wavelength in the first wavelength region The filter of the embodiment has a wavelength range of λmax (G) [nm] <λ1 <λmax (R) [nm] in its absorption spectrum. The first wavelength region (λ1) always has an absorption peak having a maximum absorption wavelength (hereinafter also referred to as an absorption peak (P1)). The absorption peak (P1) has a role of absorbing unnecessary light existing mainly on the short wavelength side of the red emission peak and the long wavelength side of the green emission peak in the emission spectrum of the liquid crystal display to be combined.

  In general, the red emission peak of the liquid crystal display is broader than the green emission peak and the blue emission peak, and there is much unnecessary light around the red emission peak wavelength. In particular, the visibility is high on the short wavelength side of the red emission peak, and if there is unnecessary light in this region, the color reproducibility is greatly reduced. Therefore, in the filter of the embodiment, it is preferable to design an absorption peak (P1) that can absorb such unnecessary light.

  Specifically, the absorption peak (P1) is the wavelength of the minimum point of the emission spectrum between the red emission peak and the green emission peak of the liquid crystal display body represented by the following formula (1) (hereinafter also referred to as λmin (RG)). )) And preferably has a maximum absorption wavelength in a wavelength region (λ11) of λmax (R) −5 nm or less. Furthermore, it is more preferable to have a maximum absorption wavelength in the wavelength region (λ12) represented by the following formula (2).

λmin (RG) [nm] <λ11 ≦ λmax (R) −5 [nm] (1)
λmin (RG) +5 [nm] ≦ λ12 ≦ λmax (R) −15 [nm] (2)

  When this relationship is applied to the filter used in combination with the liquid crystal display shown in FIGS. 1 and 2 and Table 1, the maximum absorption wavelength λmax (1) of the absorption peak (P1) having the maximum absorption wavelength in the first wavelength region. ) Is in the range of greater than 537 nm and less than 616 nm. Further, since λmin (RG) is 581 nm, the maximum absorption wavelength λmax (1) of the absorption peak (P1) is preferably in the range of more than 581 nm and not more than 611 nm, and in the range of not less than 586 nm and not more than 601 nm. More preferably it is.

  The number of absorption peaks (P1) having a maximum absorption wavelength in the first wavelength region may be one or plural. The absorption spectrum of the filter preferably has only one absorption peak having a maximum absorption wavelength in the wavelength region of λ12 in the first wavelength region.

  The full width at half maximum of the absorption peak (P1) having the maximum absorption wavelength in the first wavelength region is preferably 5 nm or more and 50 nm or less, and more preferably 10 nm or more and 40 nm or less. Depending on the emission spectrum of the liquid crystal display used in combination, if the half-value width of the absorption peak (P1) having the maximum absorption wavelength in the first wavelength region is larger than 50 nm, the light necessary to ensure color reproducibility There is a possibility that the effect of the present invention is not achieved. Further, if the half width of the absorption peak (P1) is less than 5 nm, there is a possibility that unnecessary light cannot be sufficiently absorbed by one absorption peak. In that case, a plurality of absorption peaks (P1) are required, which may be difficult in design.

  Here, the full width at half maximum in this specification is the full width at half maximum, and the horizontal axis at the position of the half of the extinction coefficient value (εg) of the maximum absorption wavelength at a specific absorption peak of the absorption spectrum. When a straight line parallel to is drawn, it is represented by a distance (nm) between two intersections at which this straight line and the curve of the absorption peak intersect.

  The absorption intensity of the absorption peak (P1) having the maximum absorption wavelength in the first wavelength region is, for example, the transmittance required for the liquid crystal display device after adjusting the maximum absorption wavelength λmax (1) and the half-value width to the above range. And is adjusted as appropriate in consideration of color and tone. Specifically, the absorption intensity of the absorption peak (P1) having the maximum absorption wavelength in the first wavelength region is preferably about 10% to 80% in terms of transmittance at the maximum absorption wavelength λmax (1), and is preferably 10% to 70%. % Is more preferable.

(2) Absorption peak having a maximum absorption wavelength in the second wavelength region The filter according to the embodiment has an absorption peak whose absorption spectrum has a maximum absorption wavelength in a third wavelength region (to be described later) (hereinafter referred to as absorption peak (P3)). In the second wavelength region (λ2) in which the wavelength range is indicated by λmax (B) [nm] <λ1 <λmax (G) [nm] (hereinafter referred to as “absorption peak”) , Also called an absorption peak (P2)).

  The filter of the embodiment optionally has an absorption peak (P2) when the absorption spectrum has an absorption peak (P3) described later. The filter of the embodiment has an absorption peak (P1) in its absorption spectrum, and has an absorption peak (P2) and / or an absorption peak (P3).

  The absorption peak (P2) has a role of absorbing unnecessary light existing mainly on the short wavelength side of the green emission peak and the long wavelength side of the blue emission peak in the emission spectrum of the liquid crystal display to be combined. Further, the absorption peak (P3) has a role of absorbing unnecessary light existing mainly on the short wavelength side of the blue emission peak in the emission spectrum of the liquid crystal display to be combined.

  In general, the green light emission peak and the blue light emission peak of the liquid crystal display body often have a sharper shape than the red light emission peak, and light emission that becomes unnecessary light is relatively small. However, in the present invention, the filter has an absorption peak (P2) having a maximum absorption wavelength in the second wavelength region and / or an absorption peak (P3) having a maximum absorption wavelength in the third wavelength region in its absorption spectrum. By adopting the constitution, the color reproducibility is further improved as compared with the case of having only the absorption peak (P1).

  Depending on the wavelength and intensity of unnecessary light of the liquid crystal display used in combination, the absorption spectrum of the filter of the embodiment preferably has an absorption peak (P2) together with an absorption peak (P1), more preferably an absorption peak. It has an absorption peak (P2) and an absorption peak (P3) together with (P1). Absorption of unnecessary light in the vicinity of the blue light emission peak has a relatively low visibility in this wavelength region, so that the improvement effect is difficult to understand, but the color reproducibility is surely improved.

  Specifically, the absorption peak (P2) is the wavelength of the minimum point of the emission spectrum between the green emission peak and the blue emission peak of the liquid crystal display body represented by the following formula (3) (hereinafter also referred to as λmin (GB)). .) It is preferable to have a maximum absorption wavelength in the near wavelength region (λ21). Furthermore, it is more preferable to have a maximum absorption wavelength in the wavelength region (λ22) represented by the following formula (4). Since the visibility is high with respect to green, and even a slight decrease in the amount of light has a large effect on the transmittance, it is preferable that λ21 is slightly blue with respect to λmin (GB).

λmin (GB) −30 [nm] ≦ λ21 ≦ λmin (GB) +25 [nm] (3)
λmin (GB) −15 [nm] ≦ λ22 ≦ λmin (GB) +15 [nm] (4)

  When this relationship is applied to a filter used in combination with the liquid crystal display shown in FIGS. 1 and 2 and Table 1, the maximum absorption wavelength λmax (2) of the absorption peak (P2) having the maximum absorption wavelength in the second wavelength region. ) Is in the range of greater than 446 nm and less than 537 nm. In addition, since λmin (GB) is 492 nm, the maximum absorption wavelength λmax (2) of the absorption peak (P2) is preferably in the range of 462 nm or more and 517 nm or less, and in the range of 477 nm or more and 507 nm or less. More preferably.

  The number of absorption peaks (P2) having a maximum absorption wavelength in the second wavelength region may be one or plural. The absorption spectrum of the filter preferably has 1 to 3 absorption peaks having a maximum absorption wavelength in the wavelength region of λ22 in the second wavelength region.

  The half width of the absorption peak (P2) having the maximum absorption wavelength in the second wavelength region is preferably 5 nm or more and 50 nm or less, and more preferably 10 nm or more and 40 nm or less. Depending on the emission spectrum of the liquid crystal display used in combination, if the half-value width of the absorption peak (P2) having the maximum absorption wavelength in the second wavelength region is larger than 50 nm, the color necessary to ensure color reproducibility The possibility of cutting high purity light is increased, and the effect of the present invention may not be achieved. Moreover, if the half width of the light absorption peak (P2) is less than 5 nm, there is a possibility that unnecessary light cannot be sufficiently absorbed by one light absorption peak. In that case, a plurality of absorption peaks (P2) are required, which may be difficult in design.

  The absorption intensity of the absorption peak (P2) having the maximum absorption wavelength in the second wavelength region is preferably about 10% to 80% in terms of transmittance at the maximum absorption wavelength λmax (2), and more preferably about 10% to 70%. .

(3) Absorption peak having a maximum absorption wavelength in the third wavelength region The filter of the embodiment, when the absorption spectrum does not have an absorption peak (P2) having a maximum absorption wavelength in the second wavelength region, It always has an absorption peak (P3) having a maximum absorption wavelength in the third wavelength region (λ3) where the wavelength range is indicated by 400 [nm] ≦ λ3 ≦ λmax (B) [nm].

  The unnecessary light absorbed by the absorption peak (P3) is unnecessary light existing mainly on the short wavelength side of the blue emission peak in the emission spectrum of the liquid crystal display to be combined, as described in the above (2). Since the luminous efficiency of blue light emission is relatively low, color reproduction is possible even when the maximum emission wavelength (λmax (B)) of the emission peak and the maximum absorption wavelength (λmax (3)) of the absorption peak (P3) are the same. It does not significantly affect the effect of improving sex.

  Note that the wavelength 400 [nm] at the lower end of the third wavelength region generally corresponds to the wavelength at which the blue emission peak rises. Specifically, the absorption peak (P3) preferably has a maximum absorption wavelength in the wavelength region (λ31) represented by the following formula (5). Furthermore, it is more preferable to have a maximum absorption wavelength in the wavelength region (λ32) represented by the following formula (6).

400 [nm] ≦ λ31 ≦ λmax (B) −5 [nm] (5)
400 [nm] ≦ λ32 ≦ λmax (B) −10 [nm] (6)

  When this relationship is applied to a filter used in combination with the liquid crystal display shown in FIGS. 1 and 2 and Table 1, the maximum absorption wavelength λmax (3) of the absorption peak (P3) having the maximum absorption wavelength in the third wavelength region. ) Is in the range of 400 nm to 446 nm, preferably in the range of 400 m to 441 nm, more preferably in the range of 400 nm to 436 nm.

  The number of absorption peaks (P3) having a maximum absorption wavelength in the third wavelength region may be one or plural. The absorption spectrum of the filter preferably has only one absorption peak having a maximum absorption wavelength in the wavelength region of λ32 in the first wavelength region.

  The full width at half maximum of the absorption peak (P3) having the maximum absorption wavelength in the third wavelength region is preferably 5 nm or more and 50 nm or less, and more preferably 10 nm or more and 40 nm or less. Depending on the emission spectrum of the liquid crystal display used in combination, if the half-value width of the absorption peak (P3) having the maximum absorption wavelength in the third wavelength region is larger than 50 nm, the color necessary to ensure color reproducibility The possibility of cutting high purity light is increased, and the effect of the present invention may not be achieved. Moreover, if the half width of the light absorption peak (P3) is less than 5 nm, there is a possibility that unnecessary light cannot be sufficiently absorbed by one light absorption peak. In that case, a plurality of absorption peaks (P3) are required, which may be difficult in design.

  The absorption intensity of the absorption peak (P3) having the maximum absorption wavelength in the third wavelength region is preferably about 10% to 80% in terms of transmittance at the maximum absorption wavelength λmax (3), and more preferably about 10% to 70%. .

  The filter of the present invention has the light absorption characteristics described above, and can be sufficiently improved in color reproducibility of the liquid crystal display by being disposed on the viewing side of the liquid crystal display.

  The filter of the embodiment preferably has the above light absorption characteristics, and the luminous transmittance with a C light source is 70% or more. The luminous transmittance is more preferably 75% or more.

  The filter of the embodiment is required that the transmitted light measured using the C light source is achromatic so as not to affect the image when a human visually recognizes. Specifically, in the filter of the present invention, the transmitted light chromaticity by the C light source is (x, y) = (0.310 ± 0.100, 0.316 ± 0. 100) is preferred. As described above, the more preferable range of the transmitted color of the C light source in the filter is that x is 0.280 or more and 0.340 or less, y is 0.285 or more and 0.345 or less, and particularly preferably x is 0.295 or more. 0.325 or less and y is 0.300 or more and 0.330 or less.

The filter of the embodiment preferably further has an antireflection function for preventing reflection of light emitted from the viewing side in order to improve the visibility of the image on the liquid crystal display, particularly the visibility in black display. Usually, the visibility in black display of image display bodies, such as a liquid crystal display body, is evaluated by the lightness L ^* in a CIELAB color coordinate (JIS Z8781-4 (2013)). By disposing a filter on the viewing side of the liquid crystal display body, a filter having an antireflection performance capable of reducing the lightness L ^* at the time of black display by about 1% as compared with the case where no filter is disposed is preferable. The lightness L ^* on the viewing side surface of the filter when the filter is arranged on the viewing side of the liquid crystal display and the liquid crystal display is displayed in black is preferably less than 20.

  The filter of the embodiment may further have a contrast improving function, an antiglare function (antiglare function), and the like in addition to the above functions as long as the effects of the present invention are not impaired.

<Filter structure>
The structure of the filter of the present invention is not particularly limited as long as the above light absorption characteristics can be achieved in the light absorption spectrum for light having a wavelength of 300 to 1000 nm. The filter of the present invention preferably has a structure that allows the luminous transmittance to be in the above range, and more preferably has a structure having the above-described antireflection function on the viewing side surface.

  In order to obtain a filter having the above light absorption characteristics, for example, if a filter is composed of a resin filter layer formed in a layer form by dispersing a dye having a predetermined light absorption peak in a transparent resin so as to have the light absorption peak described above. Good. The resin filter layer may be used alone if it can be used alone and perform the above functions. However, when used alone, the strength may not be sufficient, and in terms of independence, it may not be sufficient, so a resin filter layer is usually formed on a transparent substrate in order to provide strength and independence. To do. Furthermore, since it is difficult for the transparent substrate and the resin filter layer to have an antireflection function, it is preferable to provide the antireflection layer as the outermost surface on the viewing side of the filter.

  Regarding the stacking order of the transparent substrate, the resin filter layer, and the antireflection layer, the order of the antireflection layer, the resin filter layer, and the transparent substrate is the order of the antireflection layer, the transparent substrate, and the resin filter layer from the viewing side. There may be. In this case, you may provide the adhesion layer which consists of transparent adhesives between each layer as needed. In addition, when it says each layer which comprises a filter, a transparent substrate is also handled as a layer.

  Here, since the resin filter layer can also serve as an adhesive layer by using a transparent resin that disperses the pigment as a transparent adhesive, each layer is laminated in the order of the antireflection layer, the resin filter layer, and the transparent substrate. It can be set as the filter of the structure which does not provide an adhesion layer. The filter having such a configuration is preferable from the viewpoint of weight reduction and luminous transmittance because the number of layers can be reduced.

  The antireflection layer can be directly formed on a transparent substrate, for example, by a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method, for example, vacuum vapor deposition or sputtering which is a kind of physical vapor deposition. Moreover, you may integrate what formed the antireflection layer on transparent substrates, such as a resin film, on a transparent substrate or a resin filter layer via an adhesive.

  The filter of the embodiment is used by being arranged on the viewing side of the liquid crystal display. At this time, the filter may be disposed independently of the liquid crystal display body at a distance, or may be installed so as to be attached to the viewing side surface of the liquid crystal display body and integrated with the liquid crystal display body. . Hereinafter, a filter installed at a distance from the liquid crystal display is referred to as a “separable filter”, and a filter installed so as to be integrated with the liquid crystal display is referred to as an “integrated filter”.

  In the case of an integrated filter, the viewing side surface of the liquid crystal display and the non-viewing side surface of the filter are bonded to each other. In the filter, when the antireflection layer, the resin filter layer (also serving as the adhesive layer), and the transparent substrate are laminated in this order from the viewing side, for example, an adhesive layer is further provided on the non-viewing side of the transparent substrate and attached to the liquid crystal display do it. In this case, the lamination position of the resin filter layer (also serving as the adhesive layer) and the adhesive layer may be switched as necessary. That is, it may be a filter composed of an antireflection layer, a resin filter layer (also serving as an adhesive layer), a transparent substrate, and an adhesive layer from the viewing side. An antireflection layer, an adhesive layer, a transparent substrate, and a resin filter layer (adhesion layer) The filter may also be configured in the same manner.

  The filter may further have a functional layer such as a contrast improving layer or an antiglare (antiglare) layer as long as it does not impair the effects of the present invention. Further, depending on the design, the antireflection layer may be added with functions such as a contrast improving function and an antiglare function (antiglare function).

  The filter may be designed by a known simulation method. For example, by using the actual measurement data about the transmission spectrum or reflection spectrum of a typical existing pigment, transparent resin, and transparent substrate, and the design and selection of the pigment, etc. by the specific method shown below be able to. The absorption spectrum of the filter shown in FIGS. 1 and 2 is an absorption spectrum of the filter designed by a simulation method.

  Embodiments of the filter of the present invention will be described below with reference to the drawings. 3 and 4 are cross-sectional views showing an example and another example of the embodiment of the filter of the present invention. 5 and 6 are cross-sectional views showing an example and another example of the embodiment of the liquid crystal display device of the present invention using the filter shown in FIGS. 3 and 4, respectively.

  The filter 10A shown in FIG. 3 is an integral filter. For example, in the liquid crystal display device 20A shown in FIG. 5, the filter 10A is disposed so that the viewing side surface 21a of the liquid crystal display body 21 and the non-viewing side surface 4a of the filter 10A are in direct contact with the viewing side of the liquid crystal display body 21. To be used. The filter 10B shown in FIG. 4 is a separation type filter. In the liquid crystal display device 20B shown in FIG. 6, the filter 10B is used by being arranged independently on the viewing side of the liquid crystal display body 21 at a distance from the liquid crystal display body 21.

  In the present invention, a liquid crystal display device such as the liquid crystal display device 20A in which the liquid crystal display body 21 and the filter 10A are integrated is preferable from the viewpoint of improving image visibility as described below.

That is, when a filter is arranged on the viewing side of the liquid crystal display body, if the reflectance of the interface existing between them is high, the value of the lightness L ^* of the surface of the viewing side of the liquid crystal display body particularly when displaying black And the image quality becomes whitish, and there is a concern that the contrast of the liquid crystal display cannot be improved.

  In the integrated liquid crystal display body 21 and the filter 10A, the difference in refractive index between the material of each layer constituting the filter 10A and the material constituting the viewing-side outermost layer of the liquid crystal display body 21 is made as small as possible. The reflectance of the interface between the viewing-side surface 21a of the display body 21 and the non-viewing-side surface 4a of the filter 10A and the reflectance of the interface existing between the layers constituting the filter 10A can be adjusted low. Therefore, the image quality at the time of black display of a liquid crystal display body can be improved more by selecting material in the range which does not impair the effect of this invention.

  On the other hand, when the separation type filter 10B is used as shown in FIG. 6, an air layer exists between the liquid crystal display 21 and the filter 10B. The refractive index of air is 1.00, and the refractive index of the material constituting each layer of the liquid crystal display 21 and the filter 10B, for example, 1 of glass that is preferably used as a transparent substrate material or a material of the outermost layer of the liquid crystal display. .46, the difference from 1.49 of the acrylic resin that is preferably used as the adhesive tends to be large, and thus the interface reflectance is high, and it is difficult to improve the contrast of the liquid crystal display.

(Integrated filter)
An integrated filter 10A shown in FIG. 3 has a configuration in which an antireflection layer 3, a resin filter layer 2, a transparent substrate 1, and an adhesive layer 4 are laminated in order from the viewing side. The form, constituent materials, functions, etc. of each layer will be described below. In consideration of the reflectance at the interface, for example, the difference in refractive index between the transparent substrate 1 and the adhesive layer 4 is Δn1, and the difference in refractive index between the outermost substrate of the liquid crystal display 21 and the adhesive layer 4 is Δn2. , Δn1, and Δn2 are both preferably 0.20 or less, and more preferably 0.15 or less.

  The transparent substrate 1 preferably has transparency, high rigidity, and light weight. Examples of the material constituting the transparent substrate 1 include glass and resin. Specific examples of the resin include polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate, polyacrylates such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene, triacetate, polyvinyl alcohol, polyvinyl chloride, and polyvinylidene chloride. , Polyethylene, ethylene-vinyl acetate copolymer, polyvinyl butyral, metal ion crosslinked ethylene methacrylic acid copolymer, polyurethane, cellophane and the like are preferable. Among the above materials, glass, PET, PC, and PMMA are preferable, and glass is particularly preferable.

  Examples of the glass include ordinary soda lime glass, aluminosilicate glass, borosilicate glass, alkali-free borosilicate glass, and quartz glass. As glass, it is also possible to use glass or tempered glass that absorbs ultraviolet rays or infrared rays. Since the strength and lightness are required for the transparent substrate 1 as described above, it is preferable to use chemically strengthened glass.

The thickness of the transparent substrate 1 is preferably 0.5 to 10 mm, and more preferably 1 to 5 mm. When the thickness of the transparent substrate 1 is 0.5 mm or more, the liquid crystal display 21 can be sufficiently protected. The weight of the filter 10A can be reduced by being 10 mm or less. Further, the Young's modulus of the transparent substrate 1 is preferably 1 × 10 ⁹ Pa or more, more preferably 5 × 10 ⁹ Pa or more, and further preferably 1 × 10 ¹⁰ Pa or more. The upper limit of Young's modulus is not particularly limited, but the upper limit is preferably 5 × 10 ¹¹ Pa. It is preferable that the Young's modulus of the transparent substrate 1 be within the above range because the filter 10A having sufficient hardness to protect the liquid crystal display 21 can be obtained.

  The resin filter layer 2 is an indispensable layer provided for imparting the light absorption characteristics of the filter of the present invention described above to the filter 10A. The resin filter layer 2 is obtained by dispersing a dye having a predetermined absorption peak in a transparent resin so as to have the absorption peak described above and forming it in a layered form. Here, the transparent resin is a so-called binder resin for forming a layer.

  Examples of the dye having a predetermined absorption peak include a dye having an absorption peak having a maximum absorption wavelength in the first wavelength region (hereinafter also referred to as dye (1)) and a maximum absorption wavelength in the second wavelength region. A dye having an absorption peak (hereinafter also referred to as dye (2)) and / or a dye having an absorption peak having a maximum absorption wavelength in the third wavelength region (hereinafter also referred to as dye (3)) is used.

  That is, the resin filter layer 2 contains the dye (1) and also contains the dye (2) and / or the dye (3).

  The dye (1) contained in the resin filter layer 2 may be one kind or plural kinds. Moreover, the pigment | dye (2) in the case of containing the pigment | dye (2) and the pigment | dye (3) in the case of containing the pigment | dye (3) may be 1 type, respectively, or multiple types. The absorption peaks of the dye (1), the dye (2) and the dye (3) are respectively shown in the absorption peak (P1), the absorption peak (P2) and the absorption peak (P3) in the absorption spectrum of the filter described above. Equivalent to.

  The dye (1), the dye (2), and the dye (3) have an absorption peak (P1) in which the absorption spectrum of the obtained filter 10A is designed according to the emission spectrum of the liquid crystal display combined therewith, and the absorption peak ( It mix | blends with the resin filter layer 2 so that it may have P2) and / or a light absorption peak (P3). As described above, the resin filter layer 2 contains at least the dye (1), and further contains the dye (2) and / or the dye (3). The combination of the dyes contained in the resin filter layer 2 is preferably a combination of the dye (1) and the dye (2), and more preferably contains all of the dye (1), the dye (2) and the dye (3).

  Note that each layer (including the transparent substrate) other than the resin filter layer 2 in the filter 10A basically does not affect the absorption spectrum of the filter 10A. Therefore, the dye (1), the dye (2), and the dye (3) are resin filters such that the absorption spectrum in the resin filter layer 2 has an absorption peak (P1), an absorption peak (P2), and an absorption peak (P3). Blended into layer 2.

  Examples of the dye (1) include azo, condensed azo, diimonium, phthalocyanine, anthraquinone, indigo, perinone, perylene, dioxazine, quinacridone, methine, isoindolinone, and quinophthalone. Of known organic pigments and organic dyes and inorganic pigments, such as organic, pyrrole, thioindigo, metal complex, porphyrin, and tetraazaporphyrin, that give an absorption peak (P1) in the absorption spectrum of the resin filter layer 2 Is preferred.

  Among the dyes (1), one having a good weather resistance and a good compatibility or dispersibility with the binder resin, for example, one selected from anthraquinone dyes, quinophthalone dyes, and tetraazaporphyrin dyes, or 2 It is preferable to use a combination of two or more species as appropriate. It is more preferable to use one or two or more selected from anthraquinone dyes and tetraazaporphyrin dyes as appropriate. The dye (1) may be one that gives an absorption peak (P1) alone, or may be a combination of two or more kinds that gives an absorption peak (P1). If the above conditions are satisfied, it is preferable that the dye (1) is used alone because it is easy to maintain a high luminous transmittance.

  For example, as the dye (1) used in combination with the liquid crystal display having the emission spectrum shown in FIG. 1 and FIG. 2, as the anthraquinone dye, for example, trade name “Kayaset Violet” manufactured by Nippon Kayaku Co., Ltd. "A-R" ((λmax; 554 nm, half width; 118 nm), "Kayaset Blue N" (λmax; 645 nm, half width; 117 nm), "Kayaset Green AB" (λmax; 642 nm, half width; 134 nm) And other commercially available products.

  As for tetraazaporphyrin-based dyes, for example, trade names “TAP-HTBX” (λmax; 593 nm, half width; 27 nm), “TAP-2” (λmax; 593 nm, half width; 27 nm) manufactured by Yamada Chemical Co., Ltd. Commercial products such as “TAP-18” (λmax; 592 nm, half width; 25 nm), “TAP-45” and the like can be mentioned.

  Among the dyes (1), the absorption peak (P1) of the preferred embodiment described above is given in the absorption spectrum of the resin filter layer 2 in the filter combined with the liquid crystal display having the emission spectrum shown in FIGS. Examples of the dye (1) include TAP-HTBX, TAP-2, and TAP-18.

  Preferred examples of the dye (2) include organic pigments, organic dyes, and inorganic pigments that give an absorption peak (P2) to the absorption spectrum of the resin filter layer 2.

  The dye (2) may be one that gives an absorption peak (P2) alone, or may be a combination of two or more kinds that gives an absorption peak (P2). If the said conditions are satisfy | filled, it is preferable that a pigment | dye (2) is used independently at the point which is easy to maintain a luminous transmittance high.

  Preferred examples of the dye (3) include organic pigments, organic dyes, and inorganic pigments that give an absorption peak (P3) to the absorption spectrum of the resin filter layer 2.

  The dye (3) may be one that gives an absorption peak (P3) alone, or may be a combination of two or more types that gives an absorption peak (P3). If the said conditions are satisfy | filled, it is preferable that a pigment | dye (3) is used independently at the point which is easy to maintain luminous transmittance highly.

  The resin filter layer 2 may contain a dye other than the dye (1), the dye (2), and the dye (3) as necessary within a range not impairing the effects of the present invention. Hereinafter, as necessary, the dye (1), the dye (2), and the dye (3) are referred to as “Dye A”, and dyes other than “Dye A” are referred to as “Dye B”.

  Examples of the dye B include a color correction dye contained for the purpose of the color correction described above. The color tone correction dye may have, for example, an absorption wavelength in a wavelength region where the absorption peak of the dye A exists, or may have an absorption wavelength in other wavelength regions.

  A predetermined amount of the color correction dye is blended in the resin filter layer 2 so as to adjust the transmittance of the filter and the transmitted color of the C light source within a predetermined range. Examples of the color tone correction dye include anthraquinone series, quinophthalone series, C.I. I. Dye B that can be adjusted as described above is appropriately selected from known organic pigments such as Solvent Yellow 89, organic dyes, and inorganic pigments.

  For example, as a color tone correcting dye used in combination with the liquid crystal display having the emission spectrum shown in FIG. 1 and FIG. 2, for example, as dye B having an absorption wavelength in the wavelength region where the absorption peak of dye A exists, Can be mentioned.

  Examples of the quinophthalone dye include trade name “MS Yellow HD-137” (λmax: 449 nm, half width: 65 nm) manufactured by Yamamoto Kasei Co., Ltd. I. As for Solvent Yellow 89, for example, trade name “ORASOL YELLOW 2RLN” (λmax: 468 nm, half-value width: 114 nm) manufactured by Ciba Japan Co., Ltd. Commercial products such as “Red R20” (λmax; 506 nm, half-value width: 105 nm) may be mentioned.

  In addition, examples of the dye B having an absorption wavelength other than the wavelength region where the absorption peak of the dye A exists as the color tone correction dye include, for example, “Blue B20” (λmax; 631 nm) manufactured by Nippon Explosives Co., Ltd. . However, from the viewpoint of keeping the luminous transmittance high, the resin filter layer 2 preferably does not contain a dye other than the dye A.

  In addition, as for the absorption coefficient of the dye A and the dye B used, 10 to 90 is preferable and 25 to 75 is more preferable for the absorption coefficient at the maximum absorption wavelength in the dye A and the dye B having the maximum absorption wavelength in any wavelength region. .

As the dye A and the dye B, a dye having no hydroxyl group (—OH) and no amino group (—NH ₂ ) is preferable. Dye in the composition for forming the resin filter layer 2 according to the present invention preferably contains substantially only dye having no hydroxyl group (-OH) and amino group (-NH _2). Substantially containing only a dye having no hydroxyl group and amino group means that the dye having no hydroxyl group and amino group is 95% based on the total amount of the dye in the composition for forming the resin filter layer 2. It means that it is contained by mass% or more, more preferably 98 mass% or more, and further preferably 99 mass% or more. By using a dye having no hydroxyl group and amino group, the composition for forming the resin filter layer 2 containing the dye does not change color due to moisture, and deterioration such as fading is suppressed.

  The content of the dye A in the resin filter layer 2 depends on the absorption peak (P1), the absorption peak (P2) and the absorption peak (P3) in the absorption spectrum of the resin filter layer 2, and the luminous transmittance by the C light source required for the filter. It is adjusted together. Content of the pigment | dye A is suitably selected by the kind of pigment | dye to be used, 0.001-20 mass parts is preferable with respect to 100 mass parts of binder resin, and 0.01-10 mass parts is more preferable.

  The resin filter layer 2 is a layer in which at least the dye (1), the dye (2) and / or the dye (3) are uniformly dispersed in a transparent binder resin. The transparent binder resin is not particularly limited, and preferred examples include resin materials such as ionizing radiation curable resins, thermosetting resins, and thermoplastic resins that are usually used for filters. A conventionally known method can be used as a method for uniformly dispersing the above pigment in the resin material and forming it into a film.

  Specifically, the resin filter layer 2 is a resin in which a pigment component containing at least the pigment (1), the pigment (2) and / or the pigment (3) and an optional component described later are uniformly dispersed in the resin material. It is produced by preparing a composition for forming a filter layer, applying the composition onto, for example, the transparent substrate 1 or a separator, and drying and curing.

  In the resin filter layer in the filter of the present invention, the binder resin may be an adhesive. In the filter 10A shown in FIG. 3, the binder resin of the resin filter layer 2 is an adhesive, and the resin filter layer 2 serves as the optical filter and at the same time serves to bond the transparent substrate 1 and the antireflection layer 3 together. Have. Examples of the pressure-sensitive adhesive used for the resin filter layer 2 include acrylic pressure-sensitive adhesives, silicone pressure-sensitive adhesives, butadiene-based pressure-sensitive adhesives, and urethane-based pressure-sensitive adhesives, and acrylic pressure-sensitive adhesives are preferable.

  As the acrylic pressure-sensitive adhesive, a pressure-sensitive adhesive (E1) made of an acrylic (co) polymer containing a polymerization unit based on an acrylic monomer as a main component, and a crosslinking point in order to increase the cohesive strength of the pressure-sensitive adhesive A pressure-sensitive adhesive (E2) obtained by crosslinking an acrylic (co) polymer having a functional group (for example, a hydroxy group, an epoxy group, etc., hereinafter also referred to as “crosslinkable group”) and a crosslinking agent. . The acrylic (co) polymer constituting the pressure-sensitive adhesive (E1) may have a crosslinkable group.

  Examples of acrylic monomers used to obtain acrylic (co) polymers include (meth) acrylic acid, itaconic acid, (anhydrous) maleic acid, (anhydrous) fumaric acid, crotonic acid, and alkyl esters thereof. It is done. Here, “(meth) acrylic acid” is a generic term for acrylic acid and methacrylic acid. The same applies to (meth) acrylate. In order to increase the cohesive strength of the pressure-sensitive adhesive in the resin filter layer 2, it is preferable to use an acrylic monomer having a crosslinkable group.

Examples of alkyl esters of (meth) acrylic acid include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, n-pentyl (meth) acrylate, and n-hexyl (meta ) Acrylate, n-heptyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, and the like. .
Moreover, as a (meth) acrylic-acid type monomer which has a crosslinkable group, hydroxyethyl (meth) acrylate, glycidyl (meth) acrylate, etc. are mentioned preferably, for example.

  As the composition of the monomer used to obtain the acrylic (co) polymer, among the acrylic monomers, (meth) acrylic acid, its alkyl ester, and (meth) acrylic acid having a crosslinkable group A composition having as a main component a (meth) acrylic acid monomer selected from the monomer based monomers is preferred. Here, the main component means that the (meth) acrylic acid monomer is contained in an amount of 95% by mass or more based on the total amount of the acrylic (co) polymer, more preferably 98% by mass or more. The mass% or more is more preferable. The monomer other than the (meth) acrylic acid monomer in the acrylic (co) polymer may be a monomer other than the acrylic monomer, but is preferably a (meth) acrylic acid monomer. An acrylic monomer other than a monomer.

  The acid value of the acrylic (co) polymer is preferably 10 mgKOH / g or less. The acid value may be 0 mgKOH / g. The acid value of the acrylic (co) polymer is more preferably 0 to 7 mgKOH / g, and particularly preferably 0 to 5 mgKOH / g. When the acid value of the acrylic (co) polymer is 10 mg KOH / g or less, discoloration after the moisture resistance test can be suppressed. The acid value here is a value obtained by titration of alcoholic potassium hydroxide (KOH) using phenolphthalein as an indicator.

  In order to set the acid value of the acrylic (co) polymer to 10 mgKOH / g or less, the monomer having a carboxyl group used for copolymerization so that the acid value is within this range when the acrylic monomer is polymerized. Adjust body volume. Similarly, in order to make the degree of crosslinking within a desired range, the amount of the monomer having a crosslinkable group used for copolymerization may be adjusted. Hereinafter, in the present specification, an acrylic pressure-sensitive adhesive made of a copolymer containing a monomer having a crosslinkable group is referred to as a crosslinkable acrylic (co) polymer.

  Crosslinkable acrylic (co) polymers having an acid value of 10 mgKOH / g or less are commercially available, and may be appropriately selected from them. For example, product name: “NCK101” manufactured by Toyo Ink Co., Ltd. (acid value = 0 mgKOH / g, organic solvent content 70 parts by mass), product name: “EXK04-488” manufactured by Toyo Ink Co., Ltd. (acid value: 6.2 mgKOH / g ) And the like.

  Moreover, -40-40 degreeC is preferable and, as for the glass transition temperature (Tg) of an acryl-type (co) polymer, -30-10 degreeC is more preferable.

  When the acrylic pressure-sensitive adhesive is used as the pressure-sensitive adhesive (E1), only the acrylic (co) polymer is contained in the composition for forming a resin filter layer described above to obtain a resin filter layer. . An acrylic (co) polymer may be used individually by 1 type, and may be used in combination of 2 or more type. However, among the acrylic (co) polymers, when the crosslinkable acrylic (co) polymer is used, it is preferable that the pressure sensitive adhesive (E2) is used. That is, the composition for forming a resin filter layer contains a crosslinking agent together with a crosslinkable acrylic (co) polymer, and the crosslinked acrylic resin obtained by crosslinking when forming the resin filter layer is converted into an acrylic pressure-sensitive adhesive ( An embodiment as an adhesive (E2)) is preferable. Each of the crosslinkable acrylic (co) polymer and the crosslinking agent may be used alone or in combination of two or more. A cohesive force can be secured by reacting a crosslinkable group of the crosslinkable acrylic (co) polymer with a crosslinker to crosslink the acrylic (co) polymer.

  Examples of the crosslinking agent include melamine resin, urea resin, epoxy resin, metal oxide, metal salt, metal hydroxide, metal chelate, polyisocyanate, carboxy group-containing polymer, acid anhydride, polyamine, etc. It is suitably selected according to the type of

  As the crosslinking agent used in combination with the crosslinkable acrylic (co) polymer, when the crosslinkable group is a hydroxy group, polyisocyanate is preferable. For example, a commercial name such as “CORONATE HL” manufactured by Nippon Polyurethane Co., Ltd. Can be used.

  The ratio of the crosslinking agent to the crosslinkable acrylic (co) polymer in the pressure-sensitive adhesive (E2) is the ratio of the reactive group possessed by the crosslinking agent to the molar amount of the crosslinkable group in the crosslinkable acrylic (co) polymer. The amount that the molar amount is 0.01 to 10 times is preferable, and the amount that is 0.1 to 5 times is more preferable.

  The content of the acrylic pressure-sensitive adhesive in the resin filter layer 2 includes the resin filter layer forming composition when the pressure-sensitive adhesive (E1) made of an acrylic (co) polymer is used as the acrylic pressure-sensitive adhesive. It can be calculated as a ratio of the mass of the acrylic (co) polymer to the mass of the total solid content. In the case of the pressure-sensitive adhesive (E2) obtained by crosslinking a crosslinkable acrylic (co) polymer and a crosslinker, a crosslinkable acrylic based on the total solid content contained in the resin filter layer forming composition ( It can be calculated as a ratio of the total mass of the (co) polymer and the crosslinking agent.

  As for content of the acrylic adhesive in the resin filter layer 2, 80-99.2 mass% is preferable with respect to the total solid, and 85-98.2 mass% is more preferable.

  In the filter of the present invention, the resin filter layer 2 includes a transparent resin (adhesive) and a pigment component including at least the pigment (1) and the pigment (2) and / or the pigment (3) as necessary. , Light stabilizers, ultraviolet absorbers, leveling agents, antistatic agents, heat stabilizers, antioxidants, dispersants, flame retardants, lubricants, plasticizers, and other optional components, as long as the effects of the present invention are not impaired. May be. In addition to these components, the resin filter layer-forming composition usually contains an organic solvent.

  As the light stabilizer optionally contained in the resin filter layer 2, a known light stabilizer made of a complex having a metal, for example, copper or nickel as a central atom can be used. When the resin filter layer contains such a light stabilizer, the light resistance of the dye component is improved, and a filter having a resin filter layer with excellent durability can be obtained.

  In addition, as a complex having a metal, for example, copper or nickel as a central atom, a complex in which a ligand selected from organic ligands having an oxygen atom or a sulfur atom as a coordination atom is coordinated to a copper atom or a nickel atom. Is preferred. The ligand may be a monodentate ligand or a polydentate ligand.

  As a complex in which a ligand selected from organic ligands having an oxygen atom or a sulfur atom as a coordination atom coordinates to a copper atom or a nickel atom, specifically, for a complex in which the coordination atom is a sulfur atom A dithiol complex is mentioned. As the dithiol complex, a benzenedithiol complex or a dithiocarbamate is preferable.

  As the benzenedithiol complex, specifically, as a commercial product, trade name “EST-3” (dithiol copper complex, bis (4-piperidylsulfonyl-1,2-benzenedithiolate-S, S, manufactured by Sumitomo Seika Co., Ltd.) ') Copper-tetra-n-butylammonium), trade name "EST-5" (dithiol copper complex, bis (4-morpholinosulfonyl-1,2-dithiophenolate) copper-tetra-n-butylammonium), trade name “EST-5Ni” (dithiol nickel complex, bis (4-morpholinosulfonyl-1,2-dithiophenolate) nickel-tetra-n-butylammonium) and the like.

  Specific examples of nickel and copper dithiocarbamates include bis (dibutyldithiocarbamate) nickel (II), bis (dibutyldithiocarbamate) copper (II), bis (diethyldithiocarbamate) copper (II), bis (diethyl) And dithiocarbamic acid) nickel (II).

  Examples of the complex in which the coordination atom is an oxygen atom include salicylate and benzenesulfonate. As a complex in which the coordination atom is an oxygen atom, a salt of phthalic acid or an analogous compound thereof can also be used.

  Among these, bis (dibutyldithiocarbamate) nickel (II), bis (dibutyldithiocarbamate) copper (II), “EST-3”, and the like are preferable from the viewpoint of improving light resistance of the dye component, and bis (dibutyldithiocarbamate) Nickel (II) is particularly preferred.

  The light stabilizer is 0.001 with respect to 100 parts by mass of the binder resin as a range of the amount (mixing ratio) that the light stabilizer can exert its function while ensuring other physical properties required for the resin filter layer 2. -20 mass parts is preferable, and 0.01-10 mass parts is more preferable.

  The ultraviolet absorbers optionally contained in the resin filter layer 2 include benzotriazole ultraviolet absorbers, benzophenone ultraviolet absorbers, salicylate ultraviolet absorbers, cyanoacrylate ultraviolet absorbers, triazine ultraviolet absorbers, and oxanilide ultraviolet rays. Preferred examples include absorbers, nickel complex ultraviolet absorbers, and inorganic ultraviolet absorbers. As a commercial item, the product name "TINUVIN 479" by the Ciba Japan company etc. is mentioned.

  The ultraviolet absorber is 0.1 to 100 parts by mass of the binder resin as a range (a blending ratio) in which the ultraviolet absorber can exhibit its function while ensuring other physical properties required for the resin filter layer 2. 30 mass parts is preferable and 0.5-20 mass parts is more preferable.

  The layer thickness of the resin filter layer 2 is preferably 0.3 to 100 μm, and preferably 0.5 to 50 μm from the viewpoints of light absorption performance, the luminous transmittance of the filter 10A at a high level, and the remaining organic solvent during molding. Is more preferable.

  In the filter 10A, the adhesive layer 4 provided on the non-viewing side of the transparent substrate 1 is a layer containing a transparent adhesive as an essential component. The pressure-sensitive adhesive is not particularly limited as long as it is transparent and can adhere the transparent substrate 1 and the liquid crystal display body 21. Specifically, the material constituting the transparent substrate 1 and the viewing-side surface 21a of the liquid crystal display 21 are composed of a transparent adhesive such as an acrylic adhesive, a silicone adhesive, a butadiene adhesive, and a urethane adhesive. Depending on the material to be selected, it is appropriately selected in consideration of adhesiveness.

  Moreover, in order to improve the image quality at the time of black display of the liquid crystal display 21 having the filter 10A as the adhesive constituting the adhesive layer 4, the refractive index difference (Δn1) between the transparent substrate 1 and the adhesive layer 4 and the liquid crystal display It is preferable to select a pressure-sensitive adhesive in which the difference in refractive index (Δn2) between the outermost layer base material 21 and the pressure-sensitive adhesive layer 4 is 0.20 or less, preferably 0.15 or less. When the outermost layer base material of the transparent substrate 1 and the liquid crystal display 21 is both glass, the refractive index is 1.46. Therefore, the adhesive constituting the adhesive layer 4 has a refractive index of approximately 1.41. An acrylic pressure-sensitive adhesive in the range of ˜1.51 is preferred.

  As such an adhesive layer 4 using an acrylic adhesive, for example, the acrylic adhesive described as the binder resin of the resin filter layer 2 and an optional component (however, a dye component) contained as necessary Exclusion layer) is included. The adhesive layer 4 is preferably a layer composed only of an acrylic adhesive. Or you may comprise the adhesion layer 4 using a commercially available transparent adhesive sheet. Examples of the commercially available transparent adhesive sheet include trade name “TX48A adhesive sheet” (refractive index: 1.49, thickness: 25 μm) manufactured by Yodogawa Paper Co., Ltd.

  The layer thickness of the pressure-sensitive adhesive layer 4 is preferably 0.3 to 100 μm, more preferably 0.5 to 50 μm from the viewpoints of adhesiveness and maintaining the luminous transmittance of the filter 10A at a high level.

  In the filter 10A, the antireflection layer 3 provided on the visual recognition side of the resin filter layer 2 and serving as the outermost layer on the visual recognition side of the filter 10A includes an antireflection film formed on a transparent substrate such as a resin film, The thing which consists only of an antireflection film is mentioned. Examples of the antireflection film include a laminate obtained by alternately laminating an inorganic compound having a low refractive index and an inorganic compound having a high refractive index, a layer made of an inorganic compound having a low refractive index, and a layer made of a resin having a low refractive index. It is done. Examples of the resin having a low refractive index include a fluororesin, a silicone resin, and a fluorosilicone resin. Examples of the inorganic compound having a low refractive index include silicon dioxide.

  In the case where the antireflection layer 3 is formed by forming an antireflection film on a transparent substrate such as a resin film, a resin film made of the same resin as that constituting the transparent substrate 1, for example, a polyethylene terephthalate (PET) film In particular, it is particularly preferable that an antireflection film (hereinafter also referred to as “AR film”) made of a low refractive index material containing a fluoropolymer is formed on one side of a triacetylcellulose (TAC) film. Specifically, the low refractive index is preferably 1.1 to 1.6, more preferably 1.2 to 1.5, and further preferably 1.3 to 1.48.

  Specifically, as PET film with AR film, Asahi Glass Co., Ltd. trade name: Arc Top (URP2199), Nippon Oil & Fats trade name: Realuk (RL7800, RL9000, RL9200), AR film with TAC film, Commercial products such as Dai Nippon Printing Co., Ltd., trade name: antistatic low reflection hard coat TAC film (DSG-05SC (60)), and the like.

  The layer thickness of the antireflection layer 3 can be adjusted between 25 and 200 μm, and is preferably 50 to 150 μm from the viewpoint of bonding.

  Further, although not shown in FIG. 3, the filter 10 </ b> A may include, for example, a contrast enhancement layer having a contrast enhancement function between the resin filter layer 2 and the transparent substrate 1. Examples of the contrast enhancement layer include a layer in which a plurality of linear dark color portions arranged in parallel on a transparent substrate and a translucent region disposed between the dark color portions are formed. The translucent region has, for example, a trapezoidal shape in which the width gradually increases toward the transparent substrate side in the cross section in the side-by-side direction, and is formed so as to be connected to another adjacent translucent region at the end portion on the transparent substrate side. ing. Moreover, a dark color part is comprised by filling a dark color particle and transparent resin in the recessed part between adjacent translucent area | regions, for example.

  Further, an antiglare layer may be provided in place of the antireflection layer 3 in the filter 10A. The antiglare layer (antiglare layer) is a functional layer having a concavo-convex structure on the surface in order to reduce reflection due to reflection by a filter. The presence of the concavo-convex structure on the surface has the effect of diffusing the reflected image and blurring the contour. As described above, inorganic fine particles such as silica, or a solution in which organic fine particles such as acrylic resin and styrene resin are dispersed in a binder resin is coated on a transparent substrate such as a resin film, and the solvent is volatilized, sandblasting, or There is a method of forming irregularities on the substrate itself by etching or the like. Further, an antireflection treatment may be applied to the outermost layer. As the antiglare layer, for example, commercially available products such as trade names “DS-LR” and “DS-21” manufactured by Dai Nippon Printing Co., Ltd. and trade names manufactured by NOF Corporation: Rialc (RL5500, RL7300) are preferably used. .

  The integrated filter 10A shown in FIG. 3 is manufactured as follows, for example, and is disposed on the viewing side of the liquid crystal display body of the liquid crystal display device, and the liquid crystal display of an example of the embodiment of the present invention as shown in FIG. Device 20A is obtained.

  For example, when the resin filter layer 2 contains a pressure-sensitive adhesive, a resin filter is prepared by applying a composition for forming the resin filter layer 2 prepared in advance on the main surface on the viewing side of the transparent substrate 1 and drying it. A layered body in which the layer 2 is formed and the antireflection layer 3 is stacked thereon is manufactured. Alternatively, a composition for forming the resin filter layer 2 is applied on the separator and dried to form the resin filter layer 2. After the antireflection layer 3 is laminated on the surface, the separator is removed and the resin filter layer 2 is formed. On the main surface opposite to the side on which the antireflection layer 3 is stacked, the main surface on the viewing side of the transparent substrate 1 is superimposed to obtain a laminate.

  When the resin filter layer 2 does not contain an adhesive, the resin filter layer 2 and the antireflection layer 3 are stacked on the transparent substrate 1 in that order via the transparent adhesive layer between the transparent substrate 1 and each layer. A laminate is produced.

  Next, the obtained laminate is placed on a pressure table, and each layer is formed by moving and pressing a pressure roller covered with an elastic material such as rubber from one end portion to the other end portion of the upper surface thereof. Paste together. In addition, after bonding by such a pressure roller, by performing a heat treatment for about 20 to 120 minutes in an atmosphere of a temperature of 30 to 80 ° C. and a pressure of 0.6 to 1.2 MPa, bubbles between the functional films are removed. Disappear and can improve the appearance.

  Furthermore, the visual recognition side of the adhesive layer 4 with a separator which has a separator in the non-visual recognition side surface 4a prepared separately is affixed on the non-visual recognition side of the transparent substrate 1 of the said pressurized laminated body. In this way, an integrated filter 10A having a separator on the non-viewing side is obtained.

  When the filter 10A is disposed on the viewing side of the liquid crystal display body 21, the separator is removed from the filter 10A, and the non-viewing side surface 4a of the adhesive layer 4 that is the non-viewing side surface of the filter 10A is used as the liquid crystal display body of the liquid crystal display device. 21 is attached to the viewing side surface 21a. For example, in this way, the liquid crystal display device 20A in which the integrated filter 10A is disposed on the viewing side of the liquid crystal display body is obtained.

(Separable filter)
A separation type filter 10B shown in FIG. 4 has a configuration in which an antireflection layer 3, a resin filter layer 2, and a transparent substrate 1 are laminated in order from the viewing side. When the filter of the present invention is a separation type filter, it can be the same as the integral type filter except that it does not have the adhesive layer 4 normally used in the integral type filter.

  In addition, the manufacturing method in the separation type filter can also be performed in the same manner as in the process before the adhesive layer 4 is laminated in the integral filter.

  In order to obtain the liquid crystal display device 20B which is another example of the present embodiment shown in FIG. 6, for example, the filter 10B may be disposed at a predetermined interval on the viewing side of the liquid crystal display body 21. The fixing method of the filter 10B in the liquid crystal display device 20B is a conventional method.

  The embodiments of the present invention have been described above by taking the filters 10A and 10B for the liquid crystal display shown in FIGS. 3 and 4 as an example. However, in the filter of the present invention, each layer is within the limits not departing from the spirit of the present invention. The order of stacking, the constituent materials of each layer, and the like can be changed as appropriate. Moreover, you may provide layers other than what was demonstrated above as needed. In addition, when a resin filter layer has adhesiveness, it arrange | positions between the layers which do not have adhesiveness. Similarly, the liquid crystal display device according to the embodiment of the present invention has been described by taking the liquid crystal display devices 20A and 20B shown in FIG. 5 and FIG. 6 as examples. However, the configuration of the liquid crystal display device is limited to the extent that it does not contradict the gist of the present invention. It can be changed as appropriate.

  Hereinafter, the filter of the present invention will be described more specifically with reference to examples. First, according to Experimental Examples 1 to 7 and Calculation Examples 1 to 5, a filter having a resin filter layer containing only the dye (1) among the dyes (1) to (3) and further containing a color tone correcting dye as necessary. Actually manufactured and evaluated using a liquid crystal television (BRAVIA “KDL-46HX920” manufactured by Sony Corporation). The results of designing and evaluating the same filter by simulation are compared with the actual evaluation results to verify the simulation. Further, according to Examples 1 and 2, a simulation according to an example of the filter of the present invention was performed.

  The commercial product of the pigment | dye (1) used for the experiment example and the calculation example, and a color tone correction pigment | dye is shown below with a brand name, a manufacturer, a characteristic, etc. In the description of each example, only the product name is described.

(Dye (1))
Trade name “TAP-HTBX” (λmax; 593 nm, half width; 27 nm) manufactured by Yamada Chemical Co., Ltd.
Trade name “TAP-2” (λmax; 593 nm, half width; 27 nm) manufactured by Yamada Chemical Co., Ltd.
Product name “Kayaset Violet A-R” (λmax; 554 nm, half-value width: 118 nm) manufactured by Nippon Kayaku Co., Ltd.

(Color tone correction dye)
Trade name “MS Yellow HD-137” (λmax: 449 nm, half-value width: 65 nm) manufactured by Yamamoto Kasei Co., Ltd.
Product name “ORASOL YELLOW 2RLN” (λmax: 468 nm, half-value width: 114 nm) manufactured by Ciba Japan,
Product name “Red R20” (λmax; 506 nm, half width; 105 nm) manufactured by Nippon Kayaku Co., Ltd.
Product name “Blue B20” (λmax; 631 nm), manufactured by Nippon Kayaku Co., Ltd.

[Experiment 1]
A filter 10A having the cross-sectional structure shown in FIG. 3 was manufactured by the following method.

  14 parts by mass of methyl ethyl ketone (MEK), 2.625 parts by mass of UV absorber (trade name “TINUVIN 479” manufactured by Ciba Japan Co., Ltd.), 0.0203 parts by mass of “TAP-HTBX” as dye (1) 0.0157 parts by mass of “ORASOL YELLOW 2RLN” as a color tone correction dye, 0.0034 parts by mass of “Red R20”, bis (dibutyldithiocarbamate) nickel (II) as a light stabilizer (manufactured by Wako Pure Chemical Industries, Ltd.) 0.0769 parts by mass) was added and dissolved by stirring for 10 minutes with a mixer to obtain a dye solution.

  To this dye solution, 70 parts by mass of an acrylic pressure-sensitive adhesive (trade name “NCK101”, acid value: 0 mg KOH / g, Tg: −20 ° C., manufactured by Toyo Ink Co., Ltd.) and a crosslinking agent (trade name “Coronate, manufactured by Nippon Polyurethane Co., Ltd.” HL ") 0.82 parts by mass was added, and the mixture was further stirred and dissolved for 10 minutes to obtain a resin filter layer forming composition.

  On the separator which laminated | stacked silicone on PET, the composition for resin filter layer formation obtained above was apply | coated using the applicator, it was made to dry for 5 minutes in 100 degreeC oven, and the resin filter layer 2 with a separator was obtained.

  Then, the resin filter layer 2 with a separator is placed on a TAC film 3 with an AR film (Dai Nippon Printing Co., Ltd., trade name “DSG-05SC (60)”) so that the resin filter layer 2 is on the TAC film 3 with an AR film side. Laminated. Subsequently, the separator was removed, and the TAC film 3 with an AR film was bonded to a 1.1 mm thick chemically strengthened glass (manufactured by Asahi Glass Co., Ltd., Dragon Trail) plate 1 through the resin filter layer 2.

  Furthermore, an acrylic pressure-sensitive adhesive sheet 4 (manufactured by Yodogawa Paper, TX48A pressure-sensitive adhesive sheet, refractive index 1.49) is laminated on the surface opposite to the surface on which the TAC film 3 with the AR film of the chemically strengthened glass plate 1 is laminated. A body-shaped filter 10A was obtained.

  The obtained filter 10A was directly pasted on the screen of a liquid crystal television (BRAVIA “KDL-46HX920” manufactured by Sony Corporation) through the acrylic adhesive sheet 4.

[Experimental Examples 2 to 6]
For Experimental Examples 2 to 4 and Experimental Example 6, a filter 10A was prepared in the same manner as in Experimental Example 1 except that the formulation of the dye was changed as shown in Table 3. A liquid crystal television (SONY) was prepared in the same manner as in Experimental Example 1. Manufactured by BRAVIA “KDL-46HX920”).

  For Experimental Example 5, a separation type filter 10B having the cross-sectional structure shown in FIG. 4 without the acrylic pressure-sensitive adhesive sheet 4 was produced in the same manner as in Experimental Example 1 except that the acrylic pressure-sensitive adhesive sheet 4 was not laminated. Furthermore, the filter 10B obtained at an interval of 2 mm was attached to the viewing side of a liquid crystal television (manufactured by Sony, BRAVIA “KDL-46HX920”).

[Experimental Example 7]
A liquid crystal television (BRAVIA “KDL-46HX920” manufactured by Sony Corporation) without a filter was prepared.

[Evaluation]
Optical characteristics (luminance average transmittance, chromaticity, panel emission chromaticity, panel emission color gamut area, DCI color gamut area ratio, panel blackness) obtained in Experimental Examples 1 to 6, and durability (Heat resistance and light resistance) were evaluated by the following methods. Moreover, the panel emission chromaticity, the panel emission color gamut area, the DCI color gamut area ratio, and the blackness of the panel in the liquid crystal television of Experimental Example 7 were evaluated. The results are shown in Table 3.

(optical properties)
Using a spectrophotometer (SolidSpec-3700, manufactured by Shimadzu Corporation), the spectrum of a 20 × 20 mm square test piece cut out from each sample was measured in the range of 380 to 780 nm. According to JIS Z8701-1999, the luminous average transmittance Tv and chromaticity coordinates (x, y) were calculated. In addition, the SCI brightness (L ^* ) of the panel was measured using a spectrocolorimeter (Konica Minolta, CM-2600d).

If the DCI color gamut area ratio (%) is 80% or more, it can be said that the color reproducibility is sufficient. If the blackness of the panel (lightness L ^* ; SCI at the time of panel black display) is less than 20, the display of blackness is sufficient, and if it is 20 or more, it can be evaluated that sufficient blackness is not produced.

(Heat-resistant)
Using a constant temperature incubator (manufactured by Yamato, DS-44), set the temperature to 80 ° C., measure x and y in the color coordinates (x, y) of each sample after 250 hours test, and measure before and after the test. The values were compared.

  Those having a change amount of less than 0.003 before and after the test are all excellent in heat resistance, and any one of them can be evaluated as having heat resistance if any of them is 0.003 to less than 0.005. If any one of them has 0.005 or more, the heat resistance is insufficient.

(Light resistance)
Using a light resistance tester (Suga Test Instruments Co., Ltd., xenon weather meter X25), measure x and y in the color coordinates (x, y) of each sample after irradiating light of 380 nm or more with 300 MJ / cm ² The measured values before and after the test were compared.

  All the changes before and after the test are less than 0.003, which is excellent in light resistance. If any one of them is 0.003 or more and less than 0.005, it can be evaluated as having light resistance. If any one of them has 0.005 or more, the light resistance is insufficient.

[Calculation Examples 1 to 5]
A dye (1), a color tone correcting dye, a light stabilizer, and an ultraviolet absorber having the composition shown in Table 4 were formed on the same glass substrate as a resin filter layer by using the same acrylic pressure-sensitive adhesive and crosslinking agent as in the above experimental example. In the same manner as described above, the optical characteristics when the filter was attached to the viewing side of a liquid crystal television (manufactured by Sony, BRAVIA “KDL-46HX920”) were calculated. The results are shown in Table 4.

  Calculation Example 1 corresponds to Experimental Example 1, and Calculation Example 2 corresponds to Experimental Example 2. Calculation Example 3 is an example containing a color correction dye but no dye (1). Calculation Example 4 and Calculation Example 5 similarly contain the dye (1), while one (Calculation Example 4) is a color correction dye. The other (Calculation Example 5) is an example not containing a color tone correction dye.

As can be seen from Experimental Examples 1 and 2 in Table 3 and Calculation Examples 1 and 2 in Table 4, the actually measured values and the calculation results by simulation are in good agreement. Thus, it can be said that the validity of the simulation was verified. The simulation results in Table 4 do not have the lightness L ^* (SCI) at the time of black display, but other physical property values are in good agreement with the actual measurement values, and therefore can be assumed to be equivalent to the actual measurement values. From Table 3, in the above experimental example, when the filter has an optical adhesive layer and is arranged to adhere to the viewing side surface of the liquid crystal display body via this optical adhesive layer, the brightness at the time of black display L ^* (SCI) is less than 20, indicating that black display is sufficient.

  Further, as can be seen from Calculation Examples 3, 4, and 5, it can be seen that the effect of the color gamut expansion by the dye (1) is further improved by the presence of the color tone correcting dye. However, as compared with the following examples, it can be seen that the color gamut is not sufficiently expanded because the pigment (2) and / or the pigment (3) is not contained.

[Example 1, Example 2]
A mixture of the dye (1), the dye (2), and the dye (3) having the composition shown in Table 5 was formed on the same glass substrate as a resin filter layer by using the same acrylic pressure-sensitive adhesive and crosslinking agent as in the above experimental example. In the same manner as described above, the optical characteristics when the filter was attached to the viewing side of a liquid crystal television (manufactured by Sony, BRAVIA “KDL-46HX920”) were calculated. The results are shown in Table 5. The absorption spectrum of the filter of Example 1 is the absorption spectrum shown in FIG. 1, and the absorption spectrum of the filter of Example 2 is the absorption spectrum shown in FIG.
Further, using the results of Experimental Example 7, the area ratio (%) with respect to the color gamut area by the emission color of the liquid crystal display when the filters of Examples 1 and 2 were used was obtained and shown in Table 5.

  As can be seen from Table 5, according to the embodiment of the present invention, the DCI color gamut area ratio is 80% or more, and the color gamut area due to the emission color of the liquid crystal display device is the color gamut area due to the emission color of the liquid crystal display. 10% or more larger than

DESCRIPTION OF SYMBOLS 1 ... Transparent substrate, 2 ... Resin filter layer, 3 ... Antireflection layer, 4 ... Adhesion layer, 10A, 10B ... Filter, 20A, 20B ... Liquid crystal display device, 21 ... Liquid crystal display body

Claims (6)

A filter disposed on the viewing side of the liquid crystal display body,
The absorption spectrum of the filter with respect to light having a wavelength of 300 to 1000 nm is:
The emission spectrum emitted from the viewing side surface of the liquid crystal display body has an absorption peak having a maximum absorption wavelength in a wavelength region less than the maximum emission wavelength of the red emission peak and the maximum emission wavelength of the green emission peak, and the emission spectrum Less than the maximum emission wavelength of the green emission peak, the absorption peak having the maximum absorption wavelength in the wavelength region of the blue emission peak exceeding the maximum emission wavelength, and / or
A filter having an absorption peak having a maximum absorption wavelength in a wavelength region of 400 nm or more and a maximum emission wavelength of a blue emission peak of the emission spectrum.   The filter according to claim 1, wherein the luminous transmittance is 75% or more.   The liquid crystal display device which has a liquid crystal display body and the filter of Claim 1 or 2 arrange | positioned at the visual recognition side of the said liquid crystal display body.   4. The liquid crystal display device according to claim 3, wherein the filter has an optical adhesive layer and is adhered and disposed on the viewing side surface of the liquid crystal display body through the optical adhesive layer. 5. The liquid crystal display device according to claim 3, wherein a lightness L ^* in CIELAB color coordinates on the viewing side surface of the liquid crystal display device when the liquid crystal display body displays black is less than 20. 5.   The ratio of the DCI gamut area due to the emission color of the liquid crystal display is 80% or more, and the color gamut area due to the emission color of the liquid crystal display device is 4% or more with respect to the color gamut area due to the emission color of the liquid crystal display. The liquid crystal display device according to claim 3, wherein the liquid crystal display device is large.

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