JP6155993B2 - Method for selecting combination of color filter and light emitting device, and method for manufacturing image display device - Google Patents

Description

  The present invention relates to a method for selecting a combination of a color filter and a light emitting device, and a method for manufacturing an image display device.

  Liquid crystal display devices are rapidly spreading for many applications, and competition in terms of production cost and display image quality is intensifying year by year. All liquid crystal display devices are required to have high contrast, high speed response, high color reproduction, high brightness, and the like. Above all, high color reproduction and high brightness are characteristics that depend on the backlight source and color filter used in the liquid crystal display device, and the conventional liquid crystal display device achieves both high color reproducibility and high brightness at a high level. It was difficult to do.

  A cold cathode fluorescent lamp (CCFL), which is a conventional backlight light source, has a problem that color purity is reduced due to a sub-peak of the phosphor with respect to color reproducibility. To solve this problem, it is possible to suppress the sub-peak and improve the color purity reduction by using a high-purity phosphor, but there is a problem that the light emission efficiency is deteriorated. It was difficult to reproduce.

  The color filter also has a problem of color purity deterioration due to overlap of spectral transmission spectra of red, green, and blue pixels. In order to solve this problem, a method of improving color purity by narrowing the half-value width of the spectral transmission spectrum of each pixel of red, green, and blue and reducing the overlap of each color is known. However, in this case, with the conventional backlight light source, the luminance is lowered due to the decrease in the transmitted light, and it is difficult to achieve high color reproduction while maintaining the luminance.

In relation to the above, a semiconductor light emitting device including a semiconductor light emitting element, a green phosphor, and a red Mn ⁴⁺ activated phosphor having a narrow half-value width of the emission spectrum is known, and displays a deeper red than before. A display can be realized (see, for example, Patent Document 1). Also known is a method of combining a backlight with a white LED device combining a blue LED, a red light-emitting phosphor and a green light-emitting phosphor, and a color filter with specific parameters, so that color reproducibility is maintained while maintaining high brightness. An excellent liquid crystal display device can be realized (for example, see Patent Document 2).

JP 2010-93132 A JP 2009-76836 A

However, in the semiconductor light emitting device described in Patent Document 1, sufficient luminance and color reproduction range may not be obtained depending on the color filter to be combined. In addition, it is required to achieve a wider color reproduction range than the liquid crystal display device described in Patent Document 2.
The present invention has been made under the circumstances as described above, and provides a color filter and a light emitting device capable of efficiently selecting a combination of a color filter and a light emitting device that can constitute an image display device excellent in color reproducibility. It is an object of the present invention to provide a method for selecting a combination and a method for manufacturing an image display device.

Specific means for solving the above problems are as follows.
The present invention relates to a method for selecting a combination of a color filter and a light emitting device constituting an image display device, the step of preparing a color filter candidate including at least a blue pixel and a green pixel, a light source, a green phosphor, and tetravalent manganese The step of preparing a light emitting device candidate including a red phosphor activated by ions, and the energy of light of 485 nm or less transmitted through a blue pixel among the light transmitted through the color filter candidate by emitting the light emitting device candidate and The step of measuring the energy of light of 485 nm or less transmitted through the green pixel and the ratio (%) of the energy of light of 485 nm or less transmitted through the green pixel to the energy of light of 485 nm or less transmitted through the blue pixel is 3.0% Selecting a combination of color filter candidates and light emitting device candidates as described below.

The present invention also provides a module for an image display device including a color filter and a light emitting device selected by the selection method.
Moreover, this invention is an image display apparatus provided with the color filter selected by the said selection method, and a light-emitting device.

  The present invention also includes a step of preparing a color filter including at least a blue pixel and a green pixel, a red light source activated with a light source and a tetravalent manganese ion, and a green phosphor. A step of preparing a light emitting device that emits light in which a ratio (%) of light energy of 485 nm or less transmitted through a green pixel to energy of light transmitted of 485 nm or less is 3.0% or less; and the color filter, Forming the image display device using the light emitting device and the light transmission control member.

  ADVANTAGE OF THE INVENTION According to this invention, the selection method of the combination of the color filter and light-emitting device which can select efficiently the combination of the color filter and light-emitting device which can comprise the image display apparatus excellent in color reproducibility, and image display An apparatus manufacturing method can be provided.

It is a schematic sectional drawing which shows an example of the light-emitting device which concerns on this invention. It is a figure which shows an example of the spectral transmission spectrum of a color filter, and the emission spectrum of a light-emitting device. It is a figure which shows an example about the range of 485 nm or less among the transmitted light spectrum from the blue pixel of a color filter. It is a figure which shows an example about the range of 485 nm or less among the transmitted light spectrum from the green pixel of a color filter.

Hereinafter, embodiments according to the present invention will be described in detail. However, the embodiment described below exemplifies a method for selecting a combination of a color filter and a light emitting device for embodying the technical idea of the present invention, and the present invention relates to the color filter and the light emitting device. The method for selecting the combination is not limited to the following.
The relationship between the color name and the chromaticity coordinates, the relationship between the wavelength range of light and the color name of monochromatic light, and the like comply with JIS Z8110. Specifically, 380 nm to 455 nm is blue purple, 455 nm to 485 nm is blue, 485 nm to 495 nm is blue green, 495 nm to 548 nm is green, 548 nm to 573 nm is yellow green, 573 nm to 584 nm is yellow, 584 nm to 610 nm is yellow red , 610 nm to 780 nm is red.
The energy of light means an integrated value of energy density in a predetermined wavelength range in a spectrum diagram in which the horizontal axis represents wavelength and the vertical axis represents energy density.

  In this specification, the term “process” is not limited to an independent process, and is included in the term if the intended purpose of the process is achieved even when it cannot be clearly distinguished from other processes. . Moreover, the numerical range shown using "to" shows the range which includes the numerical value described before and behind "to" as a minimum value and a maximum value, respectively. Further, the content of each component in the composition means the total amount of the plurality of substances present in the composition unless there is a specific notice when there are a plurality of substances corresponding to each component in the composition.

<Method for selecting combination of color filter and light emitting device>
The selection method of the present invention is a method of selecting a combination of a color filter and a light emitting device that constitute an image display device, and a step of preparing a color filter candidate including at least a blue pixel and a green pixel (hereinafter referred to as “first step”). A light emitting device candidate including a light source, a green phosphor and a red phosphor activated with tetravalent manganese ions (hereinafter also referred to as a “second step”), and a light emitting device candidate. Of the light that is emitted and transmitted through the color filter candidate, the step of measuring the energy of light of 485 nm or less transmitted through the blue pixel and the energy of light of 485 nm or less transmitted through the green pixel (hereinafter referred to as “third step”) The ratio (%) of the energy of light of 485 nm or less transmitted through the green pixel to the energy of light of 485 nm or less transmitted through the blue pixel is 3 Containing 0% or less and comprising a color filter candidates and selecting a combination of the light emitting device candidates (hereinafter referred to as "fourth process"), a.

  By using a combination of a color filter and a light emitting device in which the ratio of the energy of blue light transmitted through the green pixel to the energy of light of 485 nm or less (blue light) transmitted through the blue pixel of the color filter is 3.0% or less, An image display device excellent in luminance and color reproducibility can be configured.

In the present invention, the red phosphor contained in the light emitting device is activated with tetravalent manganese ions (Mn ⁴⁺ ). Such a red phosphor exhibits a sharp emission spectrum with high emission efficiency of red light and a narrow half-value width. When an image display device is configured using such a light emitting device, the overlap of the emission spectrum of red light and green light is reduced, so that an image display device capable of obtaining red display and green display with high color purity can be obtained. . Furthermore, as a color filter to be combined, by selecting a color filter in which the energy of blue light transmitted through the green pixel is below a specific range with respect to the energy of blue light transmitted through the blue pixel, blue light and green The present invention has been completed based on the knowledge that the color reproduction range can be expanded while suppressing a decrease in luminance in the image display device because the overlap of the light emission spectrum is reduced.
That is, in the present invention, a combination of a light emitting device including a red phosphor having a specific light emission characteristic and a color filter is selected so that the energy of blue light transmitted through the green pixel is reduced. Thereby, high luminance and excellent color reproducibility can be achieved.

The image display device configured using the light emitting device and the color filter selected by the selection method of the present invention preferably has a color reproduction range exceeding 90% of the NTSC ratio on the CIE1931 chromaticity diagram, and is 93%. More preferably.
The NTSC ratio is defined by the standard three primary colors defined by the National Television Standards Committee, the chromaticity (x, y) of the CIE 1931 XYZ color system, red (0.67, 0.33), obtained by connecting the red, green, and blue monochromaticity of the image display device with reference to the triangle connecting green (0.21, 0.71) and blue (0.14, 0.08). It is the area ratio that compares the triangles. This area ratio is defined as the color reproduction range, and the higher the ratio, the higher the color reproduction.

The image display device configured using the light emitting device and the color filter selected by the selection method of the present invention preferably has a color reproduction range of more than 95% of the Adobe RGB ratio on the CIE1931 chromaticity diagram, and 97% More preferably.
Note that the AdobeRGB ratio is a standard three primary colors, red (0.6400, 0.3300) defined by the chromaticity (x, y) of the CIE1931 XYZ color system by Adobe System Incorporated. Compare triangles obtained by connecting the red, green, and blue chromaticities of image display devices with reference to the triangle connecting green (0.2100, 0.7100) and blue (0.1500, 0.0600). Is the area ratio. This area ratio is defined as the color reproduction range, and the higher the ratio, the higher the color reproduction.

In the CIE1931 chromaticity diagram, the image display device configured using the light emitting device and the color filter selected by the selection method of the present invention preferably has a color reproduction range exceeding 95% of the sRGB ratio, and 99%. More preferably.
The sRGB ratio refers to the standard three primary colors, red (0.6400, 0.3300) defined by the CIE1931 XYZ color system chromaticity (x, y) by the International Electrotechnical Commission (International Electrotechnical Commission). ), Green (0.3000, 0.6000), and blue (0.1500, 0.0600) as a reference, a triangle obtained by connecting the red, green, and blue chromaticities of the image display device. It is the compared area ratio. This area ratio is defined as the color reproduction range, and the higher the ratio, the higher the color reproduction.

(First step)
In the first step, color filter candidates including at least a blue pixel and a green pixel are prepared. The color filter candidate is prepared by preparing a color filter having a desired spectral transmission characteristic using a known method, or by appropriately selecting from commercially available color filters in consideration of the desired spectral transmission characteristic and the like. May be.

  The configuration of the color filter that is a candidate color filter can be appropriately selected from conventionally known configurations. Examples of the configuration of the color filter include a configuration in which a colored layer constituting a pixel is disposed on a light-transmitting substrate.

  The substrate used for the color filter preferably has a certain transmittance with respect to visible light, and more preferably has a transmittance of 80% or more. In general, it may be one used in a liquid crystal display device, and examples thereof include a plastic substrate such as PET, a glass substrate, and the like, but a glass substrate is usually used. A light shielding pattern may be formed on the substrate. As the light-shielding pattern, a pattern in which a metal thin film such as chrome or a light-shielding resin pattern is previously formed on a substrate may be used.

  The pixel can be formed on the substrate by any method such as a known ink jet method, printing method, photoresist method, etching method, or the like. However, in consideration of high definition, controllability and reproducibility of spectral characteristics, the photoresist method is preferable. In the photoresist method, a colored composition in which a pigment is dispersed in an appropriate solvent together with a photoinitiator and a polymerizable monomer in a light-transmitting resin is coated on a transparent substrate to form a colored layer. This is a method for forming a color filter by pattern-exposing and developing a colored layer to form one color pixel and repeating these steps for each color.

  In the case where the colored layer constituting the pixel of the color filter is formed by the photolithography method, for example, the following method is followed. A pigment serving as a colorant is dispersed in a transparent resin, and then mixed with an appropriate solvent together with a photoinitiator and a polymerizable monomer. There are various methods such as a mill base, three rolls, and a jet mill as a method for dispersing the pigment as the colorant and the transparent resin, but the method is not particularly limited thereto.

  Specific examples of organic pigments that can be used for the colored composition forming the colored layer of the color filter are shown below by color index numbers. Examples of red pigments include C.I. I. Pigment Red (PR) 7, 9, 14, 41, 48: 1, 48: 2, 48: 3, 48: 4, 81: 1, 81: 2, 81: 3, 97, 122, 123, 146, 149 168, 177, 178, 179, 180, 184, 185, 187, 192, 200, 202, 208, 210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 246, 254 255, 264, 272, 279 and the like.

  Examples of yellow pigments include C.I. I. In addition to Pigment Yellow (PY) 150, 138, PY 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 20, 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, 86, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 125, 126, 127, 128, 129, 137, 139, 144, 146, 147, 148, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 71,172,173,174,175,176,177,179,180,181,182,185,187,188,193,194,199,213,214, and the like.

  Examples of orange pigments 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. In addition to Pigment Green (PG) 36, PG 7, 10, 37, and the like can be given.

  Examples of blue pigments include C.I. I. Pigment Blue (PB) 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 60, 64, 80 and the like.

  Examples of purple pigments include C.I. I. Pigment Violet (PV) 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, 50 and the like.

  Said organic pigment may be used individually by 1 type according to the structure of the target colored layer, etc., or may be used in combination of 2 or more type.

  In combination with the organic pigment, an inorganic pigment may be used in combination in order to ensure good coatability, sensitivity, developability and the like while balancing saturation and lightness. Inorganic pigments include yellow lead, zinc yellow, red pepper (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. Further, for color matching, a dye may be contained within a range where the heat resistance does not decrease.

  The 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 region of 400 to 700 nm in the visible light region. The 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 form a transparent resin.

  For details on the resin, photoinitiator, polymerizable monomer, pixel forming method using these, and the like, reference can be made to paragraphs 0102 to 0119 of JP-A-2009-76836, for example.

The color filter to be selected by the selection method of the present invention includes at least a blue pixel and a green pixel, but preferably further includes a red pixel.
The green pixel of the color filter is an organic pigment such as C.I. from the viewpoint of widening the selection range of light emitting device candidates selected in combination with the color filter. I. Pigment number PG36 and C.I. I. C.I. in the total mass of the organic pigment included in the green pixel including the pigment number PY150. I. The content of the pigment number PG36 is preferably 20% by mass to 75% by mass, and more preferably 50% by mass to 75% by mass.

  When the green pixel includes such a combination of pigments, if the content of PG36 is 75% by mass or less, the half-value width of the spectral transmission spectrum is not too narrow, and a sufficient color reproduction range is obtained and white display is performed. Excellent brightness can be achieved. If the content of PG36 is 20% by mass or more, the half-value width of the spectral transmission spectrum does not become too wide, and a high stimulus value Y and luminance are obtained, and a sufficient color reproduction range tends to be obtained. Moreover, since color purity improves more by narrowing a permeation | transmission range, More preferably, the content rate of PG36 is 50 to 75 mass%.

  From the same viewpoint, the green pixel of the color filter is C.I. I. Pigment number PG36 and C.I. I. C. in the total mass of all organic pigments including the pigment number PY138 and included in the green pixel. I. The content of pigment number PG36 is preferably 20% by mass or more and 70% by mass or less, and more preferably 45% by mass or more and 70% by mass or less.

  When the green pixel includes such a combination of pigments, if the content of PG36 is 70% by mass or less, the half-value width of the spectral transmission spectrum is not too narrow, and a sufficient color reproduction range is obtained and white display is performed. Excellent brightness can be achieved. If the content of PG36 is 20% by mass or more, the half-value width of the spectral transmission spectrum does not become too wide, and a high stimulus value Y and luminance are obtained, and a sufficient color reproduction range tends to be obtained. Moreover, since color purity improves more by narrowing a permeation | transmission range, More preferably, the content rate of PG36 is 45 to 70 mass%.

  For the blue pixel of the color filter, a technique of shifting the spectral transmission spectrum to a short wavelength may be used in order to widen the blue color reproducibility. As one method for shifting the spectral transmission spectrum to a short wavelength, C.I. I. There is a method of increasing the content of the pigment number PV23. By appropriately adjusting the content ratio of PV23 in the blue pixel, the half width of the spectral transmission spectrum is not too narrow, and a sufficient color reproduction range can be obtained and excellent luminance can be achieved during white display.

  The blue pixel of the color filter is C.I. I. Pigment number PB15: 6 and C.I. I. CI in the total mass of the organic pigment included in the blue pixel, including pigment number PV23. I. It is preferable that the content rate of pigment number PV23 is 1 to 25 mass%, and it is more preferable that it is 2 to 20 mass%.

  The color filter preferably further includes a red pixel. For the red pixel of the color filter, a method of shifting the spectral transmission spectrum to a long wavelength may be used in order to widen the red color reproducibility. As one method for shifting the spectral transmission spectrum to a long wavelength, C.I. I. There is a method for increasing the content of the pigment number PR177. By appropriately adjusting the content of PR177 in the red pixel, the full width at half maximum of the spectral transmission spectrum does not become too narrow, a sufficient color reproduction range can be obtained, and excellent luminance during white display can be achieved.

  The red pixel of the color filter is C.I. I. Pigment number PR254 and C.I. I. C.I. in the total mass of the organic pigment included in the red pixel, including the pigment number PR177. I. The content of the pigment number PR177 is preferably 2% by mass or more and 30% by mass or less, and more preferably 5% by mass or more and 25% by mass or less.

(Second step)
In the second step, a light emitting device candidate including a light source, a green phosphor, and a red phosphor activated with tetravalent manganese ions is prepared. The light emitting device candidate can be prepared by preparing a light emitting device having desired light emitting characteristics using a known method, or by selecting appropriately from commercially available light emitting devices in consideration of the desired light emitting characteristics and the like. Good.

The configuration of the light emitting device that is a candidate for the light emitting device can be selected as appropriate from commonly used configurations. Examples of the configuration of the light emitting device include a configuration in which a light emitting element serving as a light source is sealed with a sealing resin containing a red phosphor and a green phosphor.
The form of the light emitting device is not particularly limited, and can be appropriately selected from commonly used forms. As a type of the light emitting device, a shell type, a surface mount type, and the like can be given. In general, the bullet shape refers to a shell shape in which the shape of the sealing resin constituting the outer surface is formed. In addition, the surface mount type refers to the one formed by filling a light emitting element serving as a light source and a sealing resin in a concave storage portion. Further, examples of the light emitting device include a light emitting device in which a light emitting element serving as a light source is mounted on a flat mounting substrate, and a sealing resin is formed in a lens shape so as to cover the light emitting element.

Hereinafter, an example of a light emitting device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of a light emitting device according to the present invention. This light-emitting device is an example of a surface-mounted light-emitting device.
The light emitting device 100 includes a light emitting element (light source) 10 of a gallium nitride-based compound semiconductor that emits light on a short wavelength side of visible light (for example, 380 nm to 485 nm), and a molded body 40 on which the light emitting element 10 is mounted. The molded body 40 has a first lead 20 and a second lead 30 and is integrally formed of a thermoplastic resin or a thermosetting resin. The molded body 40 has a recess having a bottom surface and side surfaces, and the light emitting element 10 is placed on the bottom surface of the recess. The light emitting element 10 has a pair of positive and negative electrodes, and the pair of positive and negative electrodes are electrically connected to the first lead 20 and the second lead 30 via the wire 60. The light emitting element 10 is sealed with a sealing member 50. The sealing member 50 is preferably made of a thermosetting resin such as an epoxy resin, a silicone resin, an epoxy-modified silicone resin, or a modified silicone resin. The sealing member 50 contains red and green phosphors 70 that convert the wavelength of light from the light emitting element 10.

  The light source preferably has a maximum emission wavelength (emission peak wavelength) of 485 nm or less, more preferably 480 nm or less, and still more preferably 460 nm or less. The lower limit value of the maximum emission wavelength is not particularly limited, but is preferably 400 nm or more, and more preferably 440 nm or more. Thereby, a red fluorescent substance and a green fluorescent substance can be excited efficiently, and visible light can be used effectively. Further, by using a light source in the wavelength range, a light-emitting device with high emission intensity can be provided.

A semiconductor light emitting element is preferably used as the light source. By using a semiconductor light emitting element as a light source, a stable light emitting device with high efficiency, high output linearity with respect to input, and strong against mechanical shock can be obtained.
As the semiconductor light emitting device, one that emits light in a short wavelength region of visible light can be used. For example, as a blue and green semiconductor light-emitting element, a device using a nitride-based semiconductor (In _X Al _Y Ga _1-XY N, 0 ≦ X, 0 ≦ Y, X + Y ≦ 1) can be used. .

  The red phosphor is not particularly limited as long as it is a red phosphor activated by tetravalent manganese ions and excited by light emitted from a light source to emit red light. From the viewpoint of the color reproduction range, the red phosphor preferably exhibits a sharp emission spectrum with a narrow value range, the excitation wavelength is 400 nm to 600 nm, the maximum emission wavelength is 610 nm to 670 nm, More preferably, the half width is 30 nm or less, the excitation wavelength is 400 nm to 485 nm, the maximum emission wavelength is 610 nm to 660 nm, and the half width of the emission spectrum is more preferably 20 nm or less.

As a red phosphor activated by such tetravalent manganese ions, William M. et al. Yen and Marvin J.H. Weber CRC Publishing "INORGANIC PHOSPHORS" p. 212 (SECTION4: PHOSPHOR DATA of 4.10 the Miscellaneous Oxides) are exemplified in, ^{Mn 4+} -activated Mg fluoro jar money preparative phosphor及 beauty Journal of the Electrochemical Society: SOLID- STATE SCIENCE AND TECHNOLOGY, in July 1973, p942 Illustrative, preferred examples are M ¹ ₂ M ² F ₆ : Mn ⁴⁺ (M ¹ = Li, Na, K, Rb, Cs; M ² = Si, Ge, Sn, Ti, Zr) phosphors. Can be mentioned.

The Mn ⁴⁺ activated Mg fluorogermanate phosphor is excited efficiently by blue light of 400 nm to 485 nm, the half width of the emission spectrum is as sharp as 15 nm, the maximum emission wavelength is 658 nm, and has a deep red color. Show. Further, the M ¹ ₂ M ² F ₆ : Mn ⁴⁺ phosphor is excited efficiently by blue light of 400 nm to 485 nm, the half width of the emission spectrum is as sharp as 8 nm, and the emission peak is 629 nm, which is deep Shows red color. Such a red phosphor has good wavelength matching with a red color filter generally used in a liquid crystal display device or the like. For this reason, when the light emitting device is used as a backlight of an image display device, red light can be emitted with high efficiency. Note that the deep color, at the time of constructing a picture table 示装 location, color reproduction range is used in the sense that more widely made colors.

From the viewpoint of the color reproduction range, the red phosphor included in the light-emitting device includes Mn ⁴⁺ activated Mg fluorogermanate phosphor and M ¹ ₂ M ² F ₆ : Mn ⁴⁺ (M ¹ = Li, Na, K, Rb , Cs; M ² = Si, Ge, Sn, Ti, Zr) is preferably at least one selected from the group consisting of phosphors, M ¹ ₂ M ² F ₆ : Mn ⁴⁺ (M ¹ = Li, It is more preferable that the phosphor is Na, K, Rb, Cs; M ² = Si, Ge, Sn, Ti, Zr), and M ¹ ₂ M ² F ₆ : Mn ⁴⁺ (M ¹ = K; M ² = Si) , Ge) is more preferable.
Further, activated amount of ^{Mn 4+} in the red phosphor, the red phosphor of the composition formula _{^{M 1 2 M 2 1-a}} Mn 4+ a F 6
In the case, it is preferable that a satisfies 0 <a <0.2.

  The light emitting device includes a green phosphor in addition to the red phosphor. The green phosphor is preferably a green phosphor that emits green light having a maximum emission wavelength in a wavelength range of 510 nm to 550 nm when excited by light emitted from a light source. When the maximum emission wavelength of the green phosphor is in the above range, the wavelength matching with the color filter is good, the luminance is increased, and the green color reproduction range tends to be wider.

  The full width at half maximum of the emission spectrum of the green phosphor is preferably 100 nm or less, and preferably 70 nm or less, from the viewpoint that the image display device shows deeper green when the light emitting device is used for an image display device. More preferred.

As such a green phosphor, Eu whose composition formula is represented by M ¹¹ ₈ MgSi ₄ O ₁₆ X ¹¹ : Eu (M ¹¹ = Ca, Sr, Ba, Zn; X ¹¹ = F, Cl, Br, I) is used. Activated chlorosilicate phosphor, M ¹² ₂ SiO ₄ : Eu activated silicate phosphor represented by Eu (M ¹² = Mg, Ca, Sr, Ba, Zn), Si _6-z Al _z O _z N _8-z : Eu-activated β sialon phosphor represented by Eu (0 <z <4.2), M ¹³ Ga ₂ S ₄ : Eu-activated thiogallate fluorescence represented by Eu (M ¹³ = Mg, Ca, Sr, Ba) And a rare earth aluminate phosphor represented by (Y, Lu) ₃ Al ₅ O ₁₂ : Ce. Among these, green phosphors are Eu-activated chlorosilicate phosphors, Eu-activated silicate phosphors, Eu-activated β sialon phosphors, Eu-activated thiogallate phosphors and rare earth aluminate phosphors from the viewpoint of the color reproduction range. It is preferably at least one selected from the group consisting of a body, and more preferably an Eu-activated β sialon phosphor.
Regarding the Eu-activated β sialon phosphor, those having a narrower half-value width of the emission spectrum and a shorter maximum emission wavelength as shown in International Publication No. 2007/066733 can be used more suitably.

(Third process)
In the third step, the energy of light of 485 nm or less transmitted through the blue pixel and the energy of light of 485 nm or less transmitted through the green pixel among the light transmitted from the light emitting device candidate and transmitted through the color filter candidate are measured. .
The energy of light is calculated from an emission spectrum having the energy density on the vertical axis and the wavelength on the horizontal axis. Specifically, in the transmission spectrum of the transmitted light from the blue pixel, the energy density of 485 nm or less transmitted through the blue pixel is calculated by integrating the energy density in the range of 380 nm to 485 nm. In the transmission spectrum of the transmitted light from the green pixel, the energy density of 485 nm or less transmitted through the green pixel is calculated by integrating the energy density in the range of 380 nm to 485 nm.

FIG. 2 shows an example of a spectrum diagram in which the emission spectrum from the light emitting device and the spectral transmission spectrum of each pixel of the color filter are superimposed. In FIG. 2, the transmission characteristic curves of the blue, green and red pixels of the color filter are shown by a solid line, a broken line and a one-dot broken line, respectively. Further, the emission spectrum from the light emitting device is shown by a thin line. From FIG. 2, it can be seen that the transmission characteristic curves of the pixels of the color filter have wavelength regions that overlap each other. In addition, the emission spectrum of the light emitting device corresponds to the light emitting device 3 of the example, and it can be seen that each has emission peaks in each of the blue, green and red wavelength regions.
FIG. 3 is an example of a transmitted light spectrum from the blue pixel of the color filter. FIG. 3 shows a transmitted light spectrum in a wavelength range of 485 nm or less among the light transmitted through the blue pixel. The energy of light of 485 nm or less transmitted through the blue pixel is calculated as an integral value of the energy density of the transmitted light spectrum. The transmitted light spectrum shown in FIG. 3 corresponds to the light emitting device 3 of the example.
FIG. 4 is an example of a transmitted light spectrum from the green pixel of the color filter. FIG. 4 shows a transmitted light spectrum in the wavelength range of 485 nm or less among the light transmitted through the green pixel. The energy of light of 485 nm or less transmitted through the green pixel is calculated as an integral value of the energy density of the transmitted light spectrum. The transmitted light spectrum shown in FIG. 4 corresponds to the light emitting device 3 of the example.

(Fourth process)
In the fourth step, the ratio of the energy of light of 485 nm or less transmitted through the green pixel to the energy of light of 485 nm or less transmitted through the blue pixel is 3.0% or less. Select a combination.
In the fourth step, for example, for a specific combination of the color filter candidate and the light emitting device candidate, the ratio of the energy of light of 485 nm or less transmitted through the green pixel to the energy of light of 485 nm or less transmitted through the blue pixel is calculated, When the calculated ratio is 3.0% or less, the combination of the color filter candidate and the light emitting device candidate may be selected as the combination of the color filter and the light emitting device selected by the selection method of the present invention.

  In an image display device configured using a combination of a color filter and a light emitting device selected by the selection method of the present invention, both high luminance and a wide color reproduction range are achieved in a balanced manner.

<Module for image display device>
The module for an image display device includes a color filter and a light emitting device selected by the selection method of the present invention. An image display device that achieves both high luminance and an excellent color reproduction range by configuring an image display device (preferably a liquid crystal display device) using a color filter and a light emitting device included in the module for the image display device. can get.
The module for an image display device may include a light emitting device as a constituent member of the backlight unit. That is, the image display device module may include a backlight unit including a light emitting device and a color filter. Here, the backlight unit refers to a combination of an optical member such as a reflection sheet, a light guide plate, a diffusion sheet, and a lens sheet, and a light emitting device.

By combining such a backlight unit and a color filter with a light transmission control member such as a liquid crystal and a driving member of a light emitting device, an image display device having excellent image display characteristics can be configured.
The color filter and the light emitting device included in the image display device module are not particularly limited as long as they are combinations selected by the selection method of the present invention, but the color filter and the light emitting device are preferably in the following modes.

The color filter includes at least a blue pixel and a green pixel, but preferably further includes a red pixel. The color filter is preferably in any of the following modes from the viewpoint of luminance and color reproduction range when the image display device is configured.
(1) Green pixels are C.I. I. Pigment number PG36 and C.I. I. C. in the total mass of the organic pigment included in the green pixel including the pigment number PY150. I. The pigment number PG36 content is 20% by mass or more and 75% by mass or less,
Blue pixels are C.I. I. Pigment number PB15: 6 and C.I. I. CI in the total mass of the organic pigment included in the blue pixel, including pigment number PV23. I. A color filter having a pigment number PV23 content of 1% by mass to 25% by mass.
(2) Green pixels are C.I. I. Pigment number PG36 and C.I. I. C. in the total mass of the organic pigment included in the green pixel including the pigment number PY138. I. The pigment number PG36 content is 20% by mass or more and 70% by mass or less,
Blue pixels are C.I. I. Pigment number PB15: 6 and C.I. I. CI in the total mass of the organic pigment included in the blue pixel, including pigment number PV23. I. A color filter having a pigment number PV23 content of 1% by mass to 25% by mass.
(3) The green pixel is C.I. I. Pigment number PG36 and C.I. I. C. in the total mass of the organic pigment included in the green pixel including the pigment number PY150. I. The pigment number PG36 content is 20% by mass or more and 75% by mass or less,
Blue pixels are C.I. I. Pigment number PB15: 6 and C.I. I. CI in the total mass of the organic pigment included in the blue pixel, including pigment number PV23. I. The content of the pigment number PV23 is 1% by mass or more and 25% by mass or less,
Red pixels are C.I. I. Pigment number PR254 and C.I. I. C.I. in the total mass of the organic pigment included in the red pixel, including the pigment number PR177. I. A color filter having a pigment number PR177 content of 2% by mass to 30% by mass.
(4) Green pixels are C.I. I. Pigment number PG36 and C.I. I. C. in the total mass of the organic pigment included in the green pixel including the pigment number PY138. I. The pigment number PG36 content is 20% by mass or more and 70% by mass or less,
Blue pixels are C.I. I. Pigment number PB15: 6 and C.I. I. CI in the total mass of the organic pigment included in the blue pixel, including pigment number PV23. I. The content of the pigment number PV23 is 1% by mass or more and 25% by mass or less,
Red pixels are C.I. I. Pigment number PR254 and C.I. I. C.I. in the total mass of the organic pigment included in the red pixel, including the pigment number PR177. I. A color filter having a pigment number PR177 content of 2% by mass to 30% by mass.

The light-emitting device includes a light source, a red phosphor, and a green phosphor. From the viewpoint of luminance and color reproducibility when an image display device is configured, the light-emitting device is preferably any of the following modes.
(1) A light emitting device in which the light source is a semiconductor light emitting element, the red phosphor has an excitation wavelength of 400 nm to 600 nm, a maximum emission wavelength of 610 nm to 670 nm, and a half width of an emission spectrum of 30 nm or less.
(2) The light source is a semiconductor light emitting device having a maximum emission wavelength of 460 nm or less, the red phosphor has an excitation wavelength of 400 nm to 600 nm, a maximum emission wavelength of 610 nm to 670 nm, and a half width of the emission spectrum of 30 nm. A light emitting device which is:
(3) The light source is a semiconductor light emitting device having a maximum emission wavelength of 460 nm or less, the red phosphor has an excitation wavelength of 400 nm to 600 nm, a maximum emission wavelength of 610 nm to 670 nm, and a half width of the emission spectrum of 30 nm. A light-emitting device in which the green phosphor is a europium (Eu) activated phosphor.
(4) light source, maximum emission wavelength of less semiconductor light emitting element 460 nm, the red phosphor, ^{Mn 4+} -activated Mg fluoro jar money collected by the phosphor and _{^{M 1 2 M 2 F 6:}} Mn 4+ (M 1 = Li, Na, K, Rb, Cs; M ² = Si, Ge, Sn, Ti, Zr) is at least one fluoride phosphor selected from the group consisting of phosphors, and the green phosphor is attached with Eu. A light emitting device which is at least one type of activated phosphor selected from the group consisting of an activated chlorosilicate phosphor, an Eu activated silicate phosphor, an Eu activated β sialon phosphor and an Eu activated thiogallate phosphor.
(5) The light source is a semiconductor light emitting device having a maximum emission wavelength of 460 nm or less, and the red phosphor is a M ¹ ₂ M ² F ₆ : Mn ⁴⁺ (M ¹ = K; M ² = Si, Ge) phosphor. A light emitting device in which the green phosphor is an Eu-activated β sialon phosphor represented by M ¹² ₂ SiO ₄ : Eu (M ¹² = Ca, Sr, Ba, Zn).

<Image display device>
The image display device includes a color filter and a light emitting device selected by the selection method. The image display device is not particularly limited as long as it includes the color filter and the light emitting device, and the configuration can be appropriately selected from conventionally known image display devices. The image display device includes, for example, a light transmission control member (for example, liquid crystal) in addition to the color filter and the light emitting device.
Since the image display device includes the color filter and the light emitting device selected by the selection method, both luminance and color reproducibility can be achieved at a high level.

<Method for Manufacturing Image Display Device>
The method for producing an image display device of the present invention includes a step of preparing a color filter including at least a blue pixel and a green pixel, a light source, a green phosphor, and a red phosphor activated with tetravalent manganese ions, A step of preparing a light emitting device that emits light in which a ratio (%) of light energy of 485 nm or less transmitted through a green pixel to energy of light of 485 nm or less transmitted through a blue pixel of a color filter is 3.0% or less And a step of configuring an image display device using the color filter, the light emitting device, and the light transmission control member.
An image display device manufactured using a color filter and a light emitting device satisfying the above specific requirements is excellent in luminance and color reproduction range.

The details of the step of preparing the color filter in the method for manufacturing the image display device are the same as those in the first step in the selection method, and the preferred embodiments are also the same.
The details of the step of preparing the light emitting device in the manufacturing method of the image display device are the same as the matters described for the second step, the third step, and the fourth step in the selection method, and the preferred embodiments are also the same. .
The step of configuring the image display device can be appropriately selected from methods usually used for manufacturing an image display device using a color filter, a light emitting device, and a light transmission control member. As the light transmission control member, for example, a member that includes liquid crystal and whose light transmittance can be controlled by an electric field can be used.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

(Production Example 1) Production of color filter A color in which the red pixel (R), the green pixel (G), and the blue pixel (B) have the pigment composition shown in Table 1 below according to the description in JP-A-2009-76836. A filter (CF1) was produced. In addition, "-" in a table | surface shows having not mix | blended.

Production Example 2 Production of Light-Emitting Device As light-emitting elements, a semiconductor light-emitting element (hereinafter also referred to as “light-emitting element 1”) having a maximum emission wavelength (emission peak wavelength) of 447 nm and a semiconductor light-emitting element (hereinafter “light-emitting element”) having a wavelength of 463 nm are used. 2 ”). A fluoride phosphor (hereinafter also referred to as “KSF”) having a composition formula of K ₂ SiF ₆ : Mn ⁴⁺ was prepared as a red phosphor. Chlorosilicate phosphor having a composition formula of M ¹¹ ₈ MgSi ₄ OX ¹¹ : Eu (M ¹¹ = Ca, Sr, Ba, Zn; X ¹¹ = F, Cl, Br, I) as a green phosphor, M ¹² ₂ Silicate phosphor represented by SiO ₄ : Eu (M ¹² = Mg, Ca, Sr, Ba, Zn), Si _6−z Al _z O _z N _8−z : Eu (0 <z <4.2) A thiogallate phosphor represented by β sialon phosphor, M ¹³ Ga ₂ S ₄ : Eu (M ¹³ = Mg, Ca, Sr, Ba) was prepared.
The prepared light-emitting elements, red phosphors and green phosphors were combined as shown in Table 2 below, and light-emitting devices 1 to 6 were produced by a conventional method.

Example 1
The color filter (CF) and light emitting device obtained above were combined as shown in Table 3 below to produce a module for an image display device.
Of the light emitted from the light emitting device and transmitted through the color filter, the energy of light of 485 nm or less transmitted through the blue pixel and the energy of light of 485 nm or less transmitted through the green pixel were measured. Next, the ratio (%) of the energy of light of 485 nm or less transmitted through the green pixel to the energy of light of 485 nm or less transmitted through the blue pixel was calculated. The results are shown in Table 3 below.
Based on the results shown in Table 3, the image display device modules 1 to 4 were selected by the selection method of the present invention.

(Evaluation)
A liquid crystal display device was produced by a conventional method using the combination of the color filter and the light emitting device of Example 1. The display characteristics of the obtained liquid crystal display device were evaluated as follows.
The chromaticity coordinates (x, y) on the CIE1931 chromaticity diagram in the red display (R), green display (G), blue display (B), and white display (W) and the stimulus value Y in the white display were measured. Moreover, the color reproduction range of NTSC ratio, AdobeRGB ratio, and sRGB ratio was calculated using the obtained chromaticity coordinates. The results are shown in Table 4 below.

  From the above, by configuring the image display device using the combination of the color filter and the light emitting device selected by the method for selecting the combination of the color filter and the light emitting device of the present invention, both high luminance and an excellent color reproduction range can be achieved. You can see that it can be achieved.

  The combination of the color filter and the light emitting device selected by the selection method of the present invention can achieve high luminance and an excellent color reproduction range when an image display device is configured.

10: light emitting element, 50: sealing member, 70: fluoride phosphor, 100: light emitting device

Claims (10)

A method for selecting a combination of a color filter and a light emitting device constituting an image display device,
Preparing a color filter candidate including at least a blue pixel and a green pixel;
Preparing a light emitting device candidate including a light source, a green phosphor, and a red phosphor activated by tetravalent manganese ions;
Measuring the energy of light of 485 nm or less transmitted through the blue pixel and the energy of light of 485 nm or less transmitted through the green pixel out of the light transmitted from the light emitting device candidate and transmitted through the color filter candidate;
Selecting a combination of a color filter candidate and a light emitting device candidate in which a ratio (%) of light energy of 485 nm or less transmitted through the green pixel to energy of light of 485 nm or less transmitted through the blue pixel is 3.0% or less; , only including,
The green phosphor has an Eu-activated β sialon phosphor represented by a composition formula of Si _6-z Al _z O _z N _8-z : Eu (0 <z <4.2) and M ¹³ Ga ₂ S _4. : At least one selected from the group consisting of Eu-activated thiogallate phosphors represented by Eu (M ¹³ = Mg, Ca, Sr, Ba),
A selection method in which the full width at half maximum of the emission spectrum of the green phosphor is 70 nm or less .   The selection method according to claim 1, wherein the red phosphor has an excitation wavelength of 400 nm to 600 nm, a maximum emission wavelength of 610 nm to 670 nm, and a half width of an emission spectrum of 30 nm or less. The red phosphor, ^{Mn 4+} -activated Mg fluoro jar money preparative phosphor及 beauty ^{_{M 1 2 M 2 F 6:}} Mn 4+ (M 1 = Li, Na, K, Rb, Cs; M 2 = Si, Ge, The selection method according to claim 1 or 2, comprising at least one selected from the group consisting of ( Sn, Ti, Zr) phosphors . Green pixels are C.I. I. Pigment number PG36 and C.I. I. C. in the total mass of the organic pigment included in the green pixel including the pigment number PY150. I. The selection method according to any one of claims 1 to 3 , wherein the content of the pigment number PG36 is 20 mass% or more and 75 mass% or less. Green pixels are C.I. I. Pigment number PG36 and C.I. I. C. in the total mass of the organic pigment included in the green pixel including the pigment number PY138. I. The selection method according to any one of claims 1 to 3 , wherein the content of the pigment number PG36 is 20 mass% or more and 70 mass% or less. Blue pixels are C.I. I. Pigment number PB15: 6 and C.I. I. CI in the total mass of the organic pigment included in the blue pixel, including pigment number PV23. I. The selection method according to any one of claims 1 to 5 , wherein the content of the pigment number PV23 is 1% by mass or more and 25% by mass or less. The maximum light emission wavelength of a light source is 460 nm or less, The selection method of any one of Claims 1-6 . The image display device module comprising a color filter and a light-emitting device selected by the selection method according to any one of claims 1 to 7. An image display device comprising a color filter and a light-emitting device selected by the selection method according to any one of claims 1 to 7. Preparing a color filter including at least a blue pixel and a green pixel;
A light source, a green phosphor, and a red phosphor activated by tetravalent manganese ions. The light of 485 nm or less transmitted through the green pixel with respect to the energy of light of 485 nm or less transmitted through the blue pixel of the color filter. A step of preparing a light emitting device that emits light having an energy ratio (%) of 3.0% or less;
Forming an image display device using the color filter, the light emitting device and the light transmission control member;
Only including,
The green phosphor has an Eu-activated β sialon phosphor represented by a composition formula of Si _6-z Al _z O _z N _8-z : Eu (0 <z <4.2) and M ¹³ Ga ₂ S _4. : At least one selected from the group consisting of Eu-activated thiogallate phosphors represented by Eu (M ¹³ = Mg, Ca, Sr, Ba),
The manufacturing method of the image display apparatus whose full width at half maximum of the emission spectrum of the said green fluorescent substance is 70 nm or less .

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