JP2004319471A - Method for manufacturing color conversion filter and color filter with color conversion function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a color conversion filter capable of simplifying a manufacturing process and at the same time enabling high-definition patterning, and a color filter having a color conversion function.
SOLUTION: A step of forming a color filter layer on a transparent substrate, a step of forming a dye layer containing a color conversion dye on the color filter layer, and a step of forming a dye through the transparent substrate and the color filter layer using dye decomposition light Exposing the layer to form a color conversion layer at a position corresponding to the color filter layer. Use of a laminate of a transparent substrate / color filter layer / dye layer as a color filter with a color conversion function.
[Selection diagram] Fig. 1

Description

  The present invention relates to a method for manufacturing a color conversion filter that enables multicolor display. The color conversion filter can be used for display of an image sensor, a personal computer, a word processor, a television, a facsimile, an audio, a video, a car navigation, an electric desk calculator, a telephone, a portable terminal, an industrial measuring instrument, and the like. is there.

  In recent years, as an example of a method for making a display multi-color or full-color, color conversion that absorbs near-ultraviolet light, blue light, blue-green light, or white light, performs wavelength distribution conversion, and emits light in the visible light range. A color conversion method using a dye for a filter has been studied (see Patent Documents 1 and 2). When the color conversion method is used, the emission color of the light source is not limited to white, so that the degree of freedom in selecting the light source can be increased. For example, green and red light can be obtained by wavelength distribution conversion using an organic EL light emitting element that emits blue light. Therefore, the possibility that a more efficient light source can be used and that a full-color light-emitting display can be constructed even by using a weak energy ray such as near ultraviolet light or visible light has been examined (Patent Documents). 3).

  An important problem in practical use as a color display is to provide a color conversion filter having high color conversion efficiency in addition to having long-term stability including fine color display function and color reproducibility. . However, when the concentration of the color conversion dye is increased to increase the color conversion efficiency, the efficiency decreases due to so-called density quenching, and the decomposition of the color conversion dye over time occurs. At present, a desired color conversion efficiency is obtained by increasing the thickness of the color filter. For the concentration quenching and prevention of decomposition of the color conversion dye, introduction of a bulky substituent into the dye nucleus has been studied (see Patent Documents 4 to 6). In addition, mixing of a quencher has been studied to prevent the decomposition of the color conversion dye (see Patent Document 7).

JP-A-8-279394 JP-A-8-286033 JP-A-9-80434 JP-A-11-279426 JP 2000-44824 A JP 2001-164245 A JP-A-2002-231450 JP-A-5-134112 JP-A-7-218717 Japanese Patent Application Laid-Open No. Hei 7-306311 JP-A-5-119306 JP-A-7-104114 JP-A-7-48424 JP-A-6-300910 JP-A-7-128519 JP-A-9-330793 JP-A-8-27934 JP-A-5-36475 Monthly Display, 1997, Volume 3, Issue 7

  In the case of increasing the definition of a multi-color or full-color display using a color conversion method, it is necessary to pattern the color conversion layer with high definition. However, for example, in the case of performing patterning such that the width of one pattern is smaller than the film thickness, the shape reproducibility of the pattern or the deformation of the pattern in a subsequent process becomes a problem. In addition, when patterning is performed by ordinary photolithography, a coating step, an exposure step involving mask alignment, and a development step are required for each color conversion layer. For example, in order to obtain a full-color display, at least a red, green and blue color conversion layer is required, so that the manufacturing process requires many steps and is complicated.

  Therefore, an object of the present invention is to provide a method of manufacturing a color conversion filter that enables high-definition patterning while simplifying the manufacturing process.

  The method of manufacturing a color conversion filter according to the first embodiment of the present invention includes a step of forming a color filter layer on a transparent substrate, a step of forming a dye layer containing a color conversion dye on the color filter layer, Exposing the dye layer through the transparent substrate and the color filter layer using decomposed light to form a color conversion layer at a position corresponding to the color filter layer, wherein the color conversion dye Is decomposed by light outside the wavelength range transmitted by the color filter layer, the dye-decomposed light contains a wavelength component that decomposes the color conversion dye, and the color conversion layer is formed by wavelength distribution conversion. Emits light to be transmitted.

  The method of manufacturing a color conversion filter according to the second embodiment of the present invention includes the steps of forming n types of color filter layers on a transparent substrate, and forming (n-1) types of colors on the n types of color filter layers. Forming a dye layer containing a conversion dye, and exposing the dye layer through the transparent substrate and the color filter layer using dye decomposition light to form an m-th color filter layer at a position corresponding to the m-th color filter layer. Forming n kinds of color conversion layers, wherein n is an integer of 2 to 6, m is an integer of 1 to n-1, and Each of them transmits light of a different wavelength range, the m-th color conversion dye is decomposed by light that is not transmitted by the m-th color filter layer, and the m-th color conversion layer is converted by the wavelength distribution conversion. To emit light transmitted by m kinds of color filter layers And it features. In this embodiment, the dye layer further includes an n-th color conversion dye; the exposure forms an n-th color conversion layer at a position corresponding to the n-th color filter layer; Is decomposed by light that does not pass through the n-th color filter layer; the n-th color conversion dye emits light that passes through the n-th color filter layer due to wavelength distribution conversion. Good.

  The color filter with a color conversion function according to the third embodiment of the present invention includes a transparent substrate, n kinds (n is an integer of 2 to 6) of color filter layers formed on the transparent substrate, and at least one color filter layer. A color layer comprising a color conversion dye, and integrally formed over the n-type color filter layer, wherein the at least one color conversion dye absorbs and absorbs a part of a wavelength range of incident light. It emits light in a wavelength range different from the wavelength range.

  As described above, according to the manufacturing methods of the first and second embodiments of the present invention, it is possible to form a high-definition color conversion layer by self-alignment using the color filter layer as a mask. According to the present invention, the necessity of patterning the color conversion layer by the photolithography method is eliminated, and the number of steps can be reduced. Further, since the color conversion layer having a larger thickness is formed integrally with the flattening layer, even if a color conversion layer having a width smaller than the film thickness is formed, deformation of the color conversion layer is suppressed. be able to. Therefore, according to the method of the present invention, it is possible to manufacture a color conversion filter used for a microdisplay (such as a viewfinder of a video camera).

  The color filter with a color conversion function according to the third embodiment of the present invention has a specific advantage as a display color filter. In this embodiment, light emitted from an independently controllable light source at a position corresponding to a sub-pixel provided in a matrix is changed in hue by a dye layer to be white light, and is incident on a color filter layer of the sub-pixel. . Therefore, unlike the case where a color conversion layer corresponding to the color of each sub-pixel is provided, the same light is incident on each color filter layer of each color. It is not necessary to consider the efficiency of the color conversion of the layers, and the cost can be reduced by simplifying the driving circuit of the light source. Furthermore, since each of the light sources arranged in a matrix can be driven under the same conditions, it is possible to suppress deterioration of only the light source corresponding to a specific color during long-time driving and maintain the display hue for a long time. It is possible to do.

  FIG. 1 shows a first embodiment of a method for manufacturing a color conversion filter of the present invention. FIG. 1A shows a laminate in which a color filter layer 2 and a dye layer 3 containing a color conversion dye (CCM) are provided on a transparent substrate 1.

  The transparent substrate 1 needs to be transparent to visible light (wavelength 400 to 700 nm), preferably light converted by the color conversion layer 4. The transparent substrate 1 should withstand the conditions (solvent, temperature, and the like) used for forming the color conversion layer 4 and other optional layers (described later), and furthermore, have dimensional stability. Preferably, it is excellent. Preferred materials for the transparent substrate 1 include glass and resins such as polyethylene terephthalate and polymethyl methacrylate. Borosilicate glass or soda lime glass is particularly preferred.

  The color filter layer 2 is a layer that transmits only light in a desired wavelength range. In the completed color conversion filter, the color filter layer 2 blocks light from a light source whose wavelength distribution has not been converted by the color conversion layer 4 and has a color purity of the light whose wavelength distribution has been converted by the color conversion layer 4. It is effective to improve. In addition, the color filter layer 2 of the present embodiment functions as a mask when forming the color conversion layer 4 by patterning the dye layer 3 in the following step (b). The color filter layer 2 contains a dye and a photosensitive resin. It is preferable to use a pigment having high light resistance as the pigment. The photosensitive resin is (1) a composition comprising an acrylic polyfunctional monomer or oligomer having a plurality of acroyl groups or methacryloyl groups and a photopolymerization initiator, and (2) a composition comprising a poly (vinylcinnamate) and a sensitizer. And (3) a composition comprising a chain or cyclic olefin and a bis azide (nitrene is generated to crosslink the olefin), (4) a composition comprising a monomer having an epoxy group and a photoacid generator, and the like. including. For example, the color filter layer 2 may be formed using a commercially available color filter material for liquid crystal (such as a color mosaic manufactured by Fuji Film Arch).

  The color filter layer 2 has a thickness of 1 to 2.5 μm, preferably 1 to 1.5 μm, depending on the pigment content. By setting the film thickness in this range, high-definition patterning becomes possible, and it becomes possible to have a transmission spectrum that sufficiently functions as both a mask in the step (b) and a filter at the time of completion.

  The dye layer 3 is a layer composed of a color conversion dye and a matrix resin. The color conversion dye is a dye that performs wavelength distribution conversion of incident light and emits light in a wavelength range transmitted by the color filter layer 2, and preferably performs wavelength distribution conversion of near-ultraviolet light or blue to blue-green light. This is a pigment that emits light (for example, blue, green, or red) in a wavelength range that the color filter layer 2 transmits. If desired, the color conversion dye may perform wavelength distribution conversion within the wavelength range that the color filter layer 2 transmits. The color conversion dye is selected from dyes that are decomposed by light transmitted through the transparent substrate 1 but are not decomposed by light transmitted through the color filter layer 2. Here, when decomposed by light transmitted through the transparent substrate 1, it is important not to generate colored decomposed products. In particular, it is strongly required that there is no absorption in a wavelength region obtained by wavelength distribution conversion. This is because absorption of the light in the wavelength range causes a decrease in light conversion efficiency. And even if it does not absorb the light in the wavelength range, the colored decomposition product is not preferable because it causes unnecessary coloration to the obtained color conversion filter.

  Examples of color conversion dyes that absorb light in the blue to blue-green region and emit red light include rhodamines such as rhodamine B, rhodamine 6G, rhodamine 3B, rhodamine 101, rhodamine 110, sulforhodamine, basic violet 11, and basic red 2. Dyes, cyanine dyes, pyridine dyes such as 1-ethyl-2- [4- (p-dimethylaminophenyl) -1,3-butadienyl] -pyridinium perchlorate (pyridine 1), or oxazine dyes .

  Examples of color conversion dyes that absorb light in the blue to blue-green region and emit green light include 3- (2′-benzothiazolyl) -7-diethylamino-coumarin (coumarin 6) and 3- (2′-benzimidazolyl). -7-diethylamino-coumarin (coumarin 7), 3- (2'-N-methylbenzimidazolyl) -7-diethylamino-coumarin (coumarin 30), 2,3,5,6-1H, 4H-tetrahydro-8-tri Coumarin dyes such as fluoromethylquinolidine (9, 9a, 1-gh) coumarin (coumarin 153), or naphthalimide dyes such as Basic Yellow 51 which is a coumarin dye dye, and Solvent Yellow 11 and Solvent Yellow 116 Including.

  Examples of the fluorescent dye that absorbs light in the near ultraviolet to visible region and emits blue light include coumarin-based dyes such as coumarin 466, coumarin 47, coumarin 2, and coumarin 102.

  Other than the dyes described above, (1) the desired wavelength distribution conversion can be performed, and (2) the light is decomposed by the light transmitted through the transparent substrate 1, but the light transmitted through the color filter layer 2 is decomposed. Various dyes (direct dyes, acid dyes, basic dyes, disperse dyes, etc.) can be used provided that they are not decomposed and (3) do not produce colored decomposed products upon photolysis.

  Matrix resins that can be used for the dye layer 3 include, in addition to those obtained by curing the above-described photosensitive resin for a color filter layer, polycarbonate, polyester (such as polyethylene terephthalate), polyether sulfone, polyvinyl butyral, polyphenylene ether, and polyamide. , Polyetherimide, norbornene resin, methacrylic resin, isobutylene-maleic anhydride copolymer resin, cyclic olefin resin, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer resin, alkyd resin, aromatic sulfonamide resin, etc. Thermoplastic resin; thermosetting resin such as epoxy resin, phenol resin, urethane resin, acrylic resin, vinyl ester resin, imide resin, urethane resin, urea resin, melamine resin; or polystyrene, polyacrylic Including nitrile, such as polycarbonate, the polymer hybrid or the like containing a trifunctional or tetrafunctional alkoxysilane. A mixture of these resins may be used as the matrix resin.

  In the present invention, it is preferable to use 0.2 micromol or more, preferably 1 to 20 micromol, more preferably 3 to 15 micromol of the color conversion dye per 1 g of the matrix resin used. The color conversion layer 4 (that is, the dye layer 3 and the flattening layer 5) has a thickness of 5 μm or more, preferably 7 to 15 μm. By having such a pigment content and a film thickness, it is possible to obtain color-converted output light having a desired intensity. Further, if desired, the color conversion layer may include more than one dye.

  In the exposure step of FIG. 1B, the exposure is performed from the transparent substrate side so that the light reaches the dye layer 3 through the color filter layer 2. The light used for exposure decomposes the dye contained in the dye layer, but contains a wavelength component absorbed by the color filter layer 2. For example, when producing a red color conversion layer, the color filter layer 2 is red, and the exposure uses light containing a wavelength component of 600 nm or less. Similarly, when a green color conversion layer is formed, the color filter layer 2 is green, and light containing a wavelength component of 500 nm or less is used for exposure. Further, when a blue color conversion layer is formed, the color filter layer 2 is blue, and light or near ultraviolet light containing a wavelength component of 400 nm or less is used for exposure. In each case, the exposure may be performed using white light containing the aforementioned wavelength components.

The light used for exposure should have a significantly higher intensity than the intensity of the light whose wavelength distribution is to be converted by the color conversion filter to be formed, and depends on the color conversion dye used, etc. It is desirable that the substrate surface has a strength of 0.05 W / cm ² or more, preferably 1 W / cm ² or more. The exposure time depends on the desired degree of decomposition of the color conversion dye, and is a matter that can be appropriately determined by those skilled in the art. By using light having such a high intensity, it becomes possible to decompose the color conversion dye in a desired area.

  As the light source, any one known in the art such as a halogen lamp, a metal halide lamp, an incandescent lamp, a discharge lamp, a mercury lamp, and a laser may be used, provided that a light source that satisfies the above-described wavelength conditions is selected. Should.

  When the above-described exposure is performed, the color conversion dye is not decomposed in the area above the color filter layer 2, whereas the color conversion dye is decomposed in the area where the color filter layer 2 is not provided. . As a result, as shown in FIG. 1C, a color conversion layer 4 is formed on the color filter layer 2, and a colorless flat surface containing no color conversion dye is formed in an area where the color filter layer 2 is not provided. The oxide layer 5 is formed. In the present embodiment, the color conversion layer 4 is a layer having the same composition as the dye layer 3 formed first.

  The method for manufacturing a color conversion filter according to the second embodiment of the method for manufacturing a color conversion filter according to the present invention includes the steps of forming n types of color filter layers on a transparent substrate, and forming ( forming a dye layer containing n-1) kinds of color conversion dyes, and exposing the dye layer through the transparent substrate and the color filter layer using dye decomposition light to form an m-th color filter layer Forming a m-th type color conversion layer at a position corresponding to the above, wherein n is an integer of 2 to 6, m represents an integer of 1 to n-1, Each of the n types of color filter layers transmits light in a different wavelength range, and the m-th color conversion dye is decomposed by light that the m-th color filter layer does not transmit, and the m-th color conversion layer Is the m-th type color filter layer by wavelength distribution conversion The transmitted light, characterized in that radiation. FIG. 2 shows the case where n = 3.

  FIG. 2A shows a first (red) color filter layer 2R, a second (green) color filter layer 2G, a third (blue) color filter layer 2B, 1 shows a laminate provided with a dye layer 3 including one color conversion dye R1 and a second color conversion dye Y1.

  The first color conversion dye R1 is a dye that emits red light by wavelength distribution conversion. Preferably, the first color conversion dye R1 converts the wavelength distribution of near-ultraviolet light or blue to blue-green light to red light (600 to 700 nm). (Within the wavelength range). In addition, the first color conversion dye R1 is decomposed by light containing a wavelength component of 600 nm or less. The second color conversion dye Y1 is a dye that emits green light (within a wavelength range of 500 to 600 nm) by wavelength distribution conversion, and preferably performs near-ultraviolet light or wavelength distribution conversion of blue to blue-green light. And a dye that emits green light. Further, the second color conversion dye Y1 is decomposed by light including a wavelength component of 500 nm or less. Each component of the laminate of the present embodiment, including the color conversion dye, can be formed using the materials described in the first embodiment.

  FIG. 2B shows an exposure step through a transparent substrate 1 and a plurality of types of color filter layers 2. The light used for exposure includes at least a component that decomposes the red conversion dye R1 and the green conversion dye Y1, and specifically includes a wavelength component of 500 to 600 nm and a wavelength component of 500 nm or less. Exposure may be performed using white light containing these wavelength components.

  At the time of exposure, the red color filter layer 2R does not transmit a wavelength component of 600 nm or less, so that neither the red conversion dye R1 nor the green conversion dye Y1 is decomposed in the dye layer 3 located above the red color filter layer 2R. Therefore, a red conversion layer 4R including R1 and Y1 is formed above the red color filter layer 2R. In the red conversion layer 4R in the present embodiment, the wavelength distribution conversion into red light may be performed only by the red conversion dye R1. Alternatively, green light emitted from the green conversion dye Y1 may be subjected to wavelength distribution conversion into red light by the red conversion dye R1.

  The green color filter layer 2G transmits a wavelength component of 500 to 600 nm, but does not transmit a wavelength component of 500 nm or less. Therefore, in the dye layer 3 located above the green color filter layer 2G, the red conversion dye R1 is decomposed by the wavelength component of 500 to 600 nm, but the green conversion dye Y1 is not decomposed. Therefore, a green color conversion layer 4G containing Y1 is formed above the green color filter layer 2G. In the green color conversion layer 4G in the present embodiment, wavelength conversion to green light is performed only by the green color conversion dye Y1.

  Further, the blue color filter layer 2B transmits a wavelength component of 400 nm to 500 nm or less. Therefore, in the dye layer 3 located above the blue color filter layer 2B, the red conversion dye R1 and the green conversion dye Y1 are decomposed by the wavelength component of 400 to 500 nm. Therefore, the layer 4B formed above the blue color filter layer 2G in the example shown in FIG. 2 does not contain a color conversion dye.

  FIG. 2C shows a color conversion filter obtained by the above-described exposure process. In the portion where the color filter layer 2 is not provided, the red conversion dye R1 and the green conversion dye Y1 are decomposed by the wavelength component of 400 nm to 500 nm, and becomes the flattening layer 5 containing no color conversion dye. When this color conversion filter is irradiated with blue or blue-green light from the color conversion layer 4 side, red light due to the wavelength distribution conversion of the red conversion layer 4R is emitted through the red color filter layer 2R, and the green conversion layer 4G Green light by wavelength distribution conversion is emitted through the green color filter layer 2G. Further, blue light is emitted through the blue color filter layer 2B.

  The content of the color conversion dye in the color conversion layer 4 and the thickness of the color conversion layer 4 in the present embodiment are the same as those in the first embodiment. Further, also in the present embodiment, each color conversion layer may include a plurality of types of dyes.

  In the present embodiment, the dye layer 3 may further include a blue conversion dye B1 that emits blue light by converting the wavelength distribution of ultraviolet light or visible light. As the blue conversion dye B1, it is preferable to use a dye that is decomposed by light having a wavelength component of 400 nm or less or near ultraviolet light.

  In the exposure step of FIG. 2B, the blue conversion dye B1 is not decomposed in the portion where each of the color filter layers 2R, 2G and 2B is provided. Therefore, the blue conversion layer 4B is a layer containing the blue conversion dye B1. In addition, the color conversion layers 4R and 4G are layers further including the blue conversion dye B1. At this time, the red conversion dye R1 and / or the green conversion dye G1 may further convert the blue light emitted from the blue conversion dye B1 into a wavelength distribution. Furthermore, when the light source used for exposure includes a wavelength component of 400 nm or less, the blue conversion dye B1 is decomposed in a portion where the color filter layer 2 is not provided, and the flattening layer 5 is separated from a layer containing no color conversion dye. Become. When the light source does not contain a wavelength component of 400 nm or less, the flattening layer 5 becomes a layer containing the blue conversion dye 4B.

  FIG. 3 shows a modification of the present embodiment. In the example of FIG. 3, a color conversion filter is formed using two exposure steps. The laminate shown in FIG. 3A is the same as that shown in FIG. In the first exposure step shown in FIG. 2B, light including a wavelength component of 500 to 600 nm is used. The wavelength component passes through the green color filter layer 4G and decomposes the red conversion dye R1 in the dye layer 3. On the other hand, since the red color filter layer 2R and the blue color filter layer 2B do not transmit this wavelength component, the red conversion dye R1 is not decomposed in the dye layer 3 located above 2R and 2B.

  Next, in the second exposure step shown in FIG. 2C, light containing a wavelength component of 400 to 500 nm is used. The wavelength component passes through the blue color filter layer 4B and decomposes the red conversion dye R1 and the green conversion dye Y1 in the dye layer 3. On the other hand, since the red color filter layer 2R and the green color filter layer 2G do not transmit this wavelength component, the red conversion dye R1 and the green conversion dye Y1 are not decomposed in the dye layer 3 located above 2R and 2G.

  The color conversion filter of FIG. 3D obtained by the above two exposure steps has the same structure as that of FIG. 2C. In this modified example, the number of exposure steps increases, but in each exposure step, a light source having a narrower emission wavelength range and higher intensity can be used. Therefore, it is possible to shorten the time of each exposure step. In this modification, the order of each exposure step is not fixed, and exposure with a shorter wavelength component may be performed first.

  Also in this modification, the dye layer 3 may further include a blue conversion dye B1 that emits blue light by converting the wavelength distribution of ultraviolet light or visible light. In that case, the blue conversion layer 4B becomes a layer containing the blue conversion dye B1.

  As described above, according to the method of the present embodiment, a color conversion filter that provides three colors of RGB necessary for full-color display can be obtained. Therefore, a multicolor display can be formed by arranging a plurality of independently controllable light sources in accordance with the position of the color conversion layer. Further, in the present embodiment, the color conversion layer 4 is formed at a desired position in a shorter process by self-alignment using the color filter layer 2 having a small thickness and high definition as a mask. It is possible to do. Further, since the matrix resin of the color conversion layer 4 and the matrix resin of the flattening layer 5 are integrated as they are when formed as the dye layer 3, even if the color conversion layer 4 having a smaller width than the film thickness is formed, Deformation of the color conversion layer 4 can be suppressed.

  Although the present embodiment has been described with respect to the case where the RGB color conversion layers are formed, it should be understood that other colors may be used. If desired, two or four or more, preferably two to six, color conversion layers may be formed. When six types of color conversion layers are formed, the first to sixth color filter layers that transmit light in the first to sixth wavelength ranges in order of wavelength are used, and the wavelength of light emitted by wavelength distribution conversion is long. When the first to fifth color conversion dyes are used in this order, the first color conversion dye is decomposed by light in the second wavelength range, and similarly, the fifth color conversion dye is converted to light in the sixth wavelength range. It is desirable to be decomposed by light. When the sixth color conversion dye is further included, it is desirable that the sixth color conversion dye is not decomposed by light in the first to sixth wavelength ranges. The same applies when two to five types of color conversion layers are formed.

  When a plurality of types of color conversion layers 4 are formed, a color conversion layer for a so-called area color display may be provided by providing a color conversion layer different from the other areas only in a certain area. Alternatively, for example, a set of RGB color conversion layers 4 having a rectangular or circular shape is arranged in a matrix, or a set of color conversion layers 4 having a parallel stripe shape is repeatedly formed on a transparent substrate. By disposing them, a color conversion filter for a display may be formed. Here, more specific color conversion layers (numerically and in terms of area) can be arranged than color conversion layers of other colors. Alternatively, a plurality of types of color conversion layers may be provided according to patterns, signs, characters, marks, and the like, and displayed. Alternatively, a single color that cannot be achieved by a single color conversion layer 4 may be displayed by using two types of color conversion layers 4 arranged at an appropriate area ratio divided into minute areas.

Further, in the method of the present embodiment, a gas barrier layer covering the dye layer 3 may be provided. Materials that can be used to form the gas barrier layer include materials that exhibit high transparency in the visible region (transmittance of 50% or more in the range of 400 to 700 nm), Tg of 100 ° C. or more, and surface hardness of 2H or more in pencil hardness. However, it is possible to select a material which does not deteriorate the function of the dye layer 3 or the color conversion layer 4 thereunder. Preferred materials for forming the gas barrier layer _{comprises SiO x, SiN x, SiN x} O y, AlO x, TiO x, TaO x, an inorganic oxide or an inorganic nitride such as ZnO _x.

Further, when a gas barrier layer is provided in the method of the present invention, the gas barrier layer may be a single layer, or may have a multi-layered structure using a plurality of separate materials. When the gas barrier layer has a multilayer structure including a plurality of layers, the above-described inorganic oxide or inorganic nitride may be stacked in a plurality of layers. Alternatively, for the purpose of further improving the flatness of the gas barrier layer surface, the above-described inorganic oxide or inorganic nitride layer and an organic material layer may be stacked. Organic materials that can be used include, for example, imide-modified silicone resins (see, for example, Patent Documents 8 to 10), inorganic metal compounds (TiO ₂ , Al ₂ O ₃ , SiO ₂ ) dispersed in acrylic, polyimide, or silicone resin UV-curable resins such as epoxy-modified acrylate resins, acrylate monomers / oligomers / polymers containing a reactive vinyl group (see Patent Document 13), and resist resins (see Patent Documents 1, 14 to 16). ), Inorganic compounds (which may be formed by a sol-gel method, see Non-Patent Document 1 and Patent Document 17), and photocurable and / or thermosetting resins such as fluorine-based resins (see Patent Documents 16 and 18). )including.

  When forming the gas barrier layer from the above materials, for example, a dry method (sputtering method, vapor deposition method, CVD method, etc.) and a wet method (spin coating method, roll coating method, casting method, dip coating method, etc.) ), Any method known in the art may be used. When a gas barrier layer is provided, a sufficient barrier property against gas (oxygen, water vapor, organic solvent vapor, etc.) can be achieved in order to minimize viewing angle dependency (change in hue due to change in observation angle). As far as possible, the thickness of the gas barrier layer is preferably small.

  A color conversion light emitting device can be formed by combining a color conversion filter formed by the method of the first embodiment of the present invention with a light emitting section (light source). As the light emitting unit, any light source that emits light in the near-ultraviolet to visible range, preferably blue to blue-green can be used. Examples of such a light source include an EL light emitting device, a plasma light emitting device, a cold cathode tube, a discharge lamp (high-pressure to ultra-high pressure mercury lamp), a light emitting diode (LED), and the like. The light emitting section is arranged on the color conversion layer 4 side. Alternatively, the light emitting section may be directly laminated on the color conversion filter formed by the method of the present invention. When the light emitting portions are directly laminated, it is particularly advantageous that the upper surface of the color conversion filter formed by the method of the present invention is flat.

  As an example of the color conversion light emitting device of the present invention, a top emission type organic EL display formed by bonding color conversion filters is shown in FIG. An organic EL element including a planarizing film 12, a lower electrode 13, an organic EL layer 14, an upper electrode 15, and a passivation layer 16 is formed on a substrate 10 on which a TFT 11 is formed in advance as a switching element. The lower electrode 13 is divided into a plurality of portions, each of which is a reflective electrode connected to the TFT 11 on a one-to-one basis, and the upper electrode 15 is a transparent electrode formed uniformly over the entire surface. Each layer forming the organic EL element can be formed using materials and methods known in the art.

  On the other hand, on the transparent substrate 1, blue, green and red color filter layers 2B, 2G and 2R and blue, green and red conversion layers 4B, 4G and 4R are formed. Further, a black mask 6 for improving contrast is formed between and around each color filter layer. For this reason, in the example shown in FIG. 4, the dye layer 3 in which none of the dyes has been decomposed remains as it exists at the position corresponding to the black mask 6, and functions as a flattening layer.

  Next, the organic EL element and the color conversion filter are aligned and adhered while forming a filler layer 22 (a layer that may be optionally provided) therebetween, and finally, the peripheral portion is adhered. Sealing is performed using the outer peripheral sealing layer (adhesive) 21 to obtain an organic EL display. FIG. 4 shows an active matrix drive type display, but it goes without saying that a passive matrix drive type organic EL element may be used.

  The aforementioned organic EL layer 14 emits light in the near-ultraviolet to visible region, preferably light in the blue to blue-green region. The emitted light enters the color conversion filter layer, and is subjected to wavelength distribution conversion into visible light having a desired color. The organic EL layer 14 includes at least an organic light emitting layer, and has a structure in which a hole injection layer, a hole transport layer, an electron transport layer, and / or an electron injection layer are interposed as necessary. Specifically, those having the following layer configurations are employed.

(1) organic light emitting layer (2) hole injection layer / organic light emitting layer (3) organic light emitting layer / electron injection layer (4) hole injection layer / organic light emitting layer / electron injection layer (5) hole injection layer / Hole transport layer / organic light emitting layer / electron injection layer (6) hole injection layer / hole transport layer / organic light emitting layer / electron transport layer / electron injection layer (In the above, the anode is an organic light emitting layer or a hole injection layer. And the cathode is connected to the organic light emitting layer or the electron injection layer)

  Known materials are used as the materials of the respective layers. In order to obtain blue to blue-green light emission, in the organic light-emitting layer, for example, a benzothiazole-based, benzimidazole-based, benzoxazole-based fluorescent whitening agent, metal chelated oxonium compound, styrylbenzene-based compound, Aromatic dimethylidin compounds are preferably used. As the hole injection layer, a phthalocyanine compound such as copper phthalocyanine or a triphenylamine derivative such as m-MTDATA can be used. As the hole transport layer, a biphenylamine such as TPD or α-NPD can be used. Derivatives and the like can be used. On the other hand, an oxadiazole derivative such as PBD, a triazole derivative, a triazine derivative, or the like can be used for the electron transport layer, and a quinolinol complex of aluminum or the like can be used for the electron injection layer. Further, an alkali metal, an alkaline earth metal or an alloy containing them, an alkali metal fluoride, or the like may be used as the electron injection layer.

  The color filter with a color conversion function according to the third embodiment of the present invention has a structure corresponding to a laminate of a transparent substrate 1 / color filter layer 2 / dye layer 3 which is also useful as an intermediate of the method of the first embodiment. It has. In this structure, the dye layer 3 functions as a layer that changes the hue of incident light from a light source. Specifically, the color conversion dye in the dye layer 3 absorbed light in a part of the wavelength range of the incident light, emitted light in a wavelength range different from the absorption wavelength range, and was not absorbed by the color conversion dye. The light in the wavelength range and the light emitted by the color conversion dye are combined to emit light of different hues. More specifically, if the dye layer 3 is configured to absorb light in a part of the wavelength range of the incident light and emit light having a complementary color relationship with the wavelength range, the dye layer 3 is emitted. The light to be emitted can be white light. For example, white light can be emitted by using blue-green light as incident light and converting a part of the light in the blue wavelength range to red light with a color conversion dye.

  As the transparent substrate 1 and the color filter layer 2, the same ones as described in the first embodiment can be used. As the dye layer 3, the same as in the first embodiment can be used.

  When the light emitted from the dye layer 3 is white light in the present embodiment, the type of the color conversion dye to be used, the absorption spectrum, the emission spectrum of the converted light, and the wavelength distribution of the light emitted from the light source used are taken into consideration. The content and the thickness of the dye layer 3 should be appropriately selected. As the color conversion dye, it is desirable to use the red conversion dye described in the first embodiment. Although it depends on the wavelength distribution of the light emitted from the light source, a green color conversion dye is introduced into the dye layer 3 to reduce the blue component of the light from the light source and simultaneously convert the green light emitted by the green color conversion dye into a red color conversion dye. , The conversion efficiency into red light is increased, the red component in the emitted light is increased, and white light having a desired wavelength distribution can be obtained. Green conversion dyes that can be used are as described in the first embodiment.

  When the light emitted from the dye layer 3 is white light, the content of the color conversion dye in the dye layer 3 and the thickness of the dye layer 3 are adjusted to reduce and reduce the amount of blue component in the light from the light source. By adjusting the amount of increase in the red component in the emitted light, it is possible to obtain white light by equalizing the intensities of the blue, green, and red components. Compared to the dye layer 3 of the first embodiment, the dye layer 3 of the present embodiment generally has a smaller film thickness, a lower color conversion dye content, or both. You may use together.

  Further, since the dye layer 3 of the present embodiment is formed so as to cover a plurality of types of color filter layers 2 existing thereunder, the color filter layer 2 is protected from the influence of the surrounding environment (humidity, oxygen, etc.). It also has a function as a protective layer. Since the patterning of the dye layer is unnecessary, the color filter with a color conversion function of the present embodiment is advantageous in that the manufacturing process is simplified, and for the same reason as in the first embodiment, This is advantageous for high definition.

  In the color filter with a color conversion function of the present embodiment, a gas barrier layer may be provided so as to cover the dye layer 3. Materials, structures, and forming methods that can be used as the gas barrier layer are the same as those described in the first embodiment.

  The color filter with a color conversion function of the present embodiment is particularly useful in combination with a light source that can be independently controlled and can be arranged in a matrix with high definition. The light source is arranged on the side of the dye layer 3. For example, it can be combined with a light valve with a liquid crystal shutter, an EL light emitting element, a plasma light emitting element, a light emitting diode (LED), or the like, preferably with an EL light emitting element, particularly preferably with an organic EL light emitting element. When white light is obtained by the dye layer 3, it is preferable to use a light source that emits blue to blue-green light. As in the case of the color conversion filter formed by the method of the first embodiment, the color filter with the color conversion function of the present embodiment and the organic EL light emitting element formed on another substrate are bonded together. An emission type organic EL display can be manufactured.

  Further, the color filter with a color conversion function of the present embodiment uses a plurality of (two to six, preferably three, particularly three types of blue, green and red) color filter layers 2 on the transparent substrate 1. This has a particular advantage as a display color filter provided with matrix-shaped pixels (composed of a plurality of sub-pixels corresponding to each color). In this embodiment, the light emitted from the independently controllable light source at the position corresponding to the sub-pixels provided in a matrix is changed in hue by the dye layer 3 to be white light, and is transmitted to the color filter layer 2 of the sub-pixel. Incident. Therefore, unlike the case where a color conversion layer corresponding to the color of each sub-pixel is provided, the same light is incident on each color filter layer of each color. It is not necessary to consider the efficiency of the color conversion of the layers, and the cost can be reduced by simplifying the driving circuit of the light source. Furthermore, since each of the light sources arranged in a matrix can be driven under the same conditions, it is possible to suppress deterioration of only the light source corresponding to a specific color during long-time driving and maintain the display hue for a long time. It is possible to do.

(Example 1)
After applying a blue filter material (manufactured by FUJIFILM Arch: Color Mosaic CB-7001) on the transparent glass substrate 1 by spin coating, patterning is performed by photolithography, and the line width is 0.1 mm and the line spacing is 0.1 mm. A blue color filter layer 2B having a line pattern of 33 mm and a thickness of 2 μm and extending in the vertical direction was formed.

  A green filter material (manufactured by FUJIFILM ARCH: Color Mosaic CG-7001) is applied on the support substrate 1 on which the blue color filter 32B is formed by spin coating, followed by patterning by photolithography to achieve a line width of 0.1 mm. A green color filter layer 2G having a line pattern of 1 mm, a line interval of 0.33 mm, and a film thickness of 2 μm and extending in the vertical direction was formed.

  Next, after applying a red filter material (manufactured by Fuji Film Arch: Color Mosaic CR-7001) by spin coating, patterning is performed by photolithography, and the line width is 0.1 mm, the line interval is 0.33 mm, and the film thickness is A red color filter layer 2R having a line pattern of 2 μm and extending in the vertical direction was formed.

  Next, coumarin 6 (0.1 parts by mass), rhodamine 6G (0.3 parts by mass) and basic violet 11 (0.3 parts by mass) were dissolved in a propylene glycol monoethyl acetate solvent (120 parts by mass). A fluorescence conversion dye solution was prepared. To this solution, 100 parts by mass of a photopolymerizable resin “V259PA / P5” (trade name, Nippon Steel Chemical Co., Ltd.) was added and dissolved to obtain a coating solution. The coating solution was applied by a spin coating method and dried by heating to form a dye layer 3 having a thickness of 7 μm. Here, coumarin 6 is a green color conversion dye, and rhodamine 6G and basic violet 11 are red color conversion dyes.

Next, exposure was performed using a carbon arc lamp (white light source) arranged on the side of the transparent substrate 1. The light intensity on the transparent substrate surface was 1 W / cm ² . Here, a sample in which a color filter layer and a dye layer are laminated on a glass substrate is separately formed, and the photodecomposition behavior of the color conversion dye of the sample is examined. Until the absorption intensity of the dye becomes 1/10 of the initial value. Is used as the exposure time in this example. As a result of the exposure, a red conversion layer 4R including rhodamine 6G and basic violet 11 was formed on the red color filter layer 2R, and a green conversion layer 4G including coumarin 6 was formed on the green color filter layer 2G. Each dye in the dye layer 3 was decomposed on the blue color filter layer 2B and in a region where the color filter layer was not provided.

  In the obtained color conversion filters, the color conversion layers 4R and 4G were provided at the positions of the corresponding color filter layers 2R and 2G, and no deformation of the color conversion layers was observed.

(Example 2)
After applying a black mask material (manufactured by FUJIFILM Arch: Color Mosaic CK-7000) on the transparent substrate 10 by spin coating, patterning is performed by photolithography to obtain a vertical 0.33 mm × horizontal 0.09 mm. A black mask 4 having a thickness of 1.5 μm and having a plurality of openings was obtained. The distance between the openings was 0.03 mm both vertically and horizontally.

  Next, after applying a blue filter material (manufactured by Fuji Film Arch: Color Mosaic CB-7001) by spin coating, patterning is performed by photolithography, and the line width is 0.1 mm, the line interval is 0.33 mm, and the film thickness is A blue color filter layer 32B having a line pattern of 2 μm and extending in the vertical direction was formed.

  A green filter material (manufactured by FUJIFILM ARCH: Color Mosaic CG-7001) is applied on the support substrate 1 on which the blue color filter 32B is formed by spin coating, followed by patterning by photolithography to achieve a line width of 0.1 mm. A green color filter layer 32G having a line pattern of 1 mm, a line interval of 0.33 mm, and a film thickness of 2 μm and extending in the vertical direction was formed.

  Next, after applying a red filter material (manufactured by Fuji Film Arch: Color Mosaic CR-7001) by spin coating, patterning is performed by photolithography, and the line width is 0.1 mm, the line interval is 0.33 mm, and the film thickness is A red color filter 32R having a line pattern of 2 μm and extending in the vertical direction was formed.

  Next, coumarin 6 (0.1 parts by mass), rhodamine 6G (0.3 parts by mass) and basic violet 11 (0.3 parts by mass) were dissolved in a propylene glycol monoethyl acetate solvent (120 parts by mass). A fluorescence conversion dye solution was prepared. To this solution, 100 parts by mass of a photopolymerizable resin “V259PA / P5” (trade name, Nippon Steel Chemical Co., Ltd.) was added and dissolved to obtain a coating solution. The coating solution was applied by a spin coating method and dried by heating to form a dye layer 3 having a thickness of 7 μm. Here, coumarin 6 is a green color conversion dye, and rhodamine 6G and basic violet 11 are red color conversion dyes.

Next, exposure was performed using a carbon arc lamp (white light source) arranged on the side of the transparent substrate 1. The light intensity on the transparent substrate surface was 1 W / cm ² . Here, a sample in which a color filter layer and a dye layer are laminated on a glass substrate is separately formed, and the photodecomposition behavior of the color conversion dye of the sample is examined. Until the absorption intensity of the dye becomes 1/10 of the initial value. Is used as the exposure time in this example. As a result of the exposure, a red conversion layer 4R including rhodamine 6G and basic violet 11 was formed on the red color filter layer 2R, and a green conversion layer 4G including coumarin 6 was formed on the green color filter layer 2G. In the layer 4B on the blue color filter layer 2B, all the dyes were decomposed.

  In the obtained color conversion filter, pixels having a size of 0.36 mm × 0.36 mm including the black mask are arranged in a matrix, and each pixel is 0.33 mm in the vertical direction × 0.09 mm in the horizontal direction. RGB sub-pixels.

  A 500-nm-thick Al film and a 100-nm-thick IZO film are formed by sputtering using a mask on a glass substrate 10 on which a TFT 11 and an insulating planarization film 12 having an opening at a source electrode portion of the TFT are provided in advance. Thus, the first electrode 13 divided into a plurality of portions each corresponding to one of the TFTs 11 was formed. Each portion of the first electrode 13 has a size of 0.33 mm in the vertical direction × 0.09 mm in the horizontal direction, and is arranged in a matrix at an interval of 0.03 mm both vertically and horizontally.

Subsequently, the substrate on which the first electrode 13 was formed was mounted in a resistance heating evaporation apparatus to form the organic EL layer 14. The organic EL layer 14 had a four-layer structure of a hole injection layer / a hole transport layer / an organic EL light emitting layer / an electron injection layer. The internal pressure of the vacuum chamber was reduced to 1 × 10 ⁻⁴ Pa, copper phthalocyanine (CuPc, hole injection layer) having a thickness of 100 nm, and 4,4′-bis [N- (1-naphthyl) -N-) having a thickness of 20 nm. Phenylamino] biphenyl (α-NPD, hole transport layer), 30 nm thick 4,4′-bis (2,2′-diphenylvinyl) biphenyl (DPVBi, organic EL light emitting layer), and 20 nm thick aluminum Tris (8-quinolinolate) (Alq, electron injection layer) was laminated without breaking vacuum to obtain an organic EL layer 80. Further, the second electrode 15 was formed by laminating 10 nm thick Mg / Ag (mass ratio 10: 1) and 10 nm thick IZO without breaking vacuum.

Finally, a passivation layer made of SiO ₂ having a thickness of 500 nm was formed so as to cover the structure below the second electrode, thereby obtaining an organic EL light emitting device.

Next, the color conversion filter was carried into a glove box controlled to a water concentration of 1 ppm and an oxygen concentration of 1 ppm. Then, using a dispenser robot, an ultraviolet curable adhesive (trade name: 30Y-437, manufactured by Three Bond Co., Ltd.) in which beads having a diameter of 20 μm are dispersed is applied to the outer peripheral portion of the transparent substrate 1 of the color conversion filter using an outer peripheral sealing layer. No. 21 was applied. While performing the alignment, the color conversion filter and the organic EL element were bonded to form an assembly. Subsequently, using a UV lamp, ultraviolet rays of 100 mW / cm ² were irradiated for 30 seconds to cure the outer peripheral sealing layer 11 to obtain an organic EL display.

(Example 3)
This example is for illustrating the effect of the dye layer 2 used in the third embodiment of the present invention.

  To 25 g of photoresist V259PAP5 (manufactured by Nippon Steel Chemical Co., Ltd.), 0.05 g of coumarin 6 and 0.04 g of rhodamine B were added to obtain a coating solution. This was applied to the upper surface of a transparent substrate (1737 glass substrate made by Corning) to obtain a dye layer having a thickness of 2 μm.

Next, a gas barrier layer composed of a 0.5 μm-thick SiO ₂ film was formed so as to cover the dye layer by using a sputtering method, thereby obtaining a dye layer substrate. An RF-planar magnetron type apparatus was used as a sputtering apparatus, SiO ₂ was used as a target, and Ar was used as a sputtering gas. The substrate temperature during the formation of the SiO ₂ film was set to 80 ° C.

  On a separate substrate, an anode (a laminate of 500 nm thick Al and 100 nm thick ITO), an organic EL layer, and a cathode (10 nm thick Mg / Ag (mass ratio 10/1) and 10 nm thick (A laminate with ITO) was formed to obtain an organic EL device. The organic EL layer had a stacked structure of 100 nm thick CuPc, 20 nm thick α-NPD, 30 nm thick DPVBi, and 20 nm thick Alq from the anode side. The obtained organic EL element emitted blue-green light in the CIE XYZ coordinate system.

  The dye layer substrate and the organic EL element obtained as described above were arranged such that the gas barrier layer and the transparent anode faced each other, and the organic EL element emitted light. The light emitted through the dye layer had a chromaticity value of (x, y) = (0.30, 0.33), and had a wide wavelength distribution in the visible region.

(Example 4)
On a transparent substrate (Corning 1737 glass substrate), a black mask material (Fuji Film Arch: Color Mosaic CK-7000), a blue filter material (Fuji Film Arch: Color Mosaic CB-7001), a green filter material, and a red color Using a filter material (manufactured by Fuji Film Arch: Color Mosaic CR-7001), a color filter layer and a black mask were produced by photolithography.

  Here, the size of each sub-pixel is 300 μm × 100 μm; the gap between adjacent sub-pixels (that is, the area where the black mask is formed) is 30 μm in the vertical direction and 10 μm in the horizontal direction; blue, green, and red sub-pixels Are arranged so as to form one pixel. In addition, 50 pixels are arranged in the vertical direction and 50 pixels in the horizontal direction, and the total is 2500 pixels. The thickness of each color filter layer was 1 μm for blue and red, and 2 μm for green.

  Next, 0.05 g of coumarin 6 and 0.04 g of rhodamine B were added to 25 g of photoresist V259PAP5 (manufactured by Nippon Steel Chemical Co., Ltd.) to obtain a coating solution. This was applied on the color filter layer and the upper surface of the black mask to obtain a dye layer having a thickness of 2 μm.

Next, a gas barrier layer made of a 0.5 μm-thick SiO ₂ film was formed so as to cover the dye layer using a sputtering method, and a color filter with a color conversion function was obtained. An RF-planar magnetron type apparatus was used as a sputtering apparatus, SiO ₂ was used as a target, and Ar was used as a sputtering gas. The substrate temperature during the formation of the SiO ₂ film was set to 80 ° C.

  A first electrode (reflective anode) made of Al having a thickness of 500 nm and ITO having a thickness of 100 nm was formed on a separate glass substrate by using a sputtering method and a photolithographic method. The first electrodes had a stripe pattern extending in the vertical direction, and were arranged so that the width of each stripe was 105 μm and the pitch was 110 μm (the interval between adjacent stripes was 5 μm).

Next, the substrate on which the first electrode was formed was placed in a resistance heating evaporation apparatus, and under a vacuum chamber pressure of 10 ⁻⁴ Pa, a 100-nm-thick CuPc film as a hole-injection layer and a 20-nm-thick film as a hole-transport layer An organic EL layer was formed by stacking α-NPD, DPVBi having a thickness of 30 nm as a light emitting layer, and Alq having a thickness of 20 nm as an electron injection layer.

  Then, using a mask, a second electrode made of Mg / Ag (mass ratio: 10/1) having a thickness of 10 nm and ITO having a thickness of 10 nm was stacked on the organic EL layer. The second electrode had a stripe pattern extending in the horizontal direction, and the width of each stripe was 300 μm, and the second electrodes were arranged so that the pitch was 330 μm (the interval between adjacent stripes was 30 μm).

Finally, a passivation layer made of SiO ₂ having a thickness of 500 nm was formed so as to cover the structure below the second electrode, thereby obtaining an organic EL light emitting device.

Next, the color filter with a color conversion function and the organic EL light emitting element were carried into a glove box controlled to a moisture concentration of 1 ppm and an oxygen concentration of 1 ppm. Then, using a dispenser robot, an ultraviolet curable adhesive (trade name: 30Y-437, manufactured by Three Bond Co., Ltd.) in which beads having a diameter of 20 μm are dispersed is sealed around the outer periphery of the transparent substrate of the color filter with a color conversion function. It was applied as a stop layer. While performing the alignment, the color fill with the color conversion function and the organic EL light emitting element were bonded to form an assembly. Subsequently, ultraviolet rays of 100 mW / cm ² were irradiated for 30 seconds to cure the outer peripheral sealing layer to obtain an organic EL display.

  The emission characteristics of the organic EL display manufactured as described above were measured. Specifically, the chromaticity value when all the pixels are turned on (W), and the chromaticity value and luminance ratio when all the sub-pixels corresponding to each color are turned on (R, G, B) (all pixels) (The relative value when 100 is lit) is measured. The results are shown in Table 1.

FIG. 3 is a schematic view illustrating a method for manufacturing the color conversion filter according to the first embodiment of the present invention. It is a schematic diagram showing a manufacturing method of a color conversion filter of a second embodiment of the present invention. It is the schematic which shows the modification of the manufacturing method of the color conversion filter of the 2nd Embodiment of this invention. FIG. 2 is a schematic cross-sectional view illustrating an example of a color conversion light emitting device formed using a color conversion filter manufactured by the method of the present invention.

Explanation of reference numerals

1 Transparent substrate 2 (R, G, B) Color filter layer (red, green, blue)
3 dye layer 4 (R, G, B) color conversion layer (red, green, blue)
5 Flattening layer 6 Black mask 10 Substrate 11 TFT
Reference Signs List 12 flattening film 13 first electrode 14 organic EL layer 15 second electrode 16 passivation layer 21 outer peripheral sealing layer 22 filler layer

Claims (20)

Forming a color filter layer on a transparent substrate,
Forming a dye layer containing a color conversion dye on the color filter layer,
Exposing the dye layer through the transparent substrate and the color filter layer using dye-decomposed light to form a color conversion layer at a position corresponding to the color filter layer,
The color conversion dye is decomposed by light outside the wavelength band transmitted by the color filter layer,
The dye decomposition light includes a wavelength component that decomposes the color conversion dye,
The method for manufacturing a color conversion filter, wherein the color conversion layer emits light transmitted through the color filter layer by wavelength distribution conversion.   The method according to claim 1, wherein the dye-separated light is white light. Forming n kinds of color filter layers on a transparent substrate;
Forming a dye layer containing (n-1) kinds of color conversion dyes on the n kinds of color filter layers;
Exposing the dye layer through the transparent substrate and the color filter layer using dye-decomposed light to form an m-th color conversion layer at a position corresponding to the m-th color filter layer. ,here,
n is an integer of 2 to 6,
m represents an integer of 1 to n-1,
Each of the n types of color filter layers transmits light in a different wavelength range,
The m-th color conversion dye is decomposed by light that is not transmitted by the m-th color filter layer,
A method for manufacturing a color conversion filter, wherein the m-th color conversion layer emits light transmitted by the m-th color filter layer by wavelength distribution conversion.   The (m + 1) -th color filter layer transmits light having a shorter wavelength than the m-th color filter layer, and the m-th color conversion dye is more transparent than the light transmitted by the m-th color filter layer. The method according to claim 3, wherein the color conversion filter is decomposed by light having a short wavelength.   5. The method according to claim 3, wherein the dye-separated light has all wavelength components that decompose the (n−1) kinds of color conversion dyes. 6.   The method according to claim 5, wherein the dye-separated light is white light.   4. The method according to claim 3, wherein the exposure is performed a plurality of times, and a wavelength component for decomposing the m-th color conversion dye is included in any of the dye-separated lights used in the plurality of exposures. Or a method for manufacturing a color conversion filter according to 4.   7. The method according to claim 6, wherein the exposure is performed (n-1) times, and the m-th exposure is performed using light including a wavelength component that decomposes the m-th color conversion dye. A method for manufacturing the color conversion filter according to the above. The dye layer further includes an n-th color conversion dye; the exposure forms an n-th color conversion layer at a position corresponding to the n-th color filter layer; The n-th color conversion layer is decomposed by light not transmitted by the n-th color filter layer; and the n-th color conversion dye emits light transmitted by the n-th color filter layer by wavelength distribution conversion. 4. The method for manufacturing a color conversion filter according to item 3.   The (m + 1) -th color filter layer transmits light having a shorter wavelength than the m-th color filter layer, and the m-th color conversion dye is more transparent than the light transmitted by the m-th color filter layer. The color according to claim 9, wherein the n-th color conversion dye is decomposed by light having a short wavelength, and the n-th color conversion dye is decomposed by light having a shorter wavelength than light transmitted through the n-th color filter layer. Manufacturing method of conversion filter.   The method according to claim 10, wherein the dye-separated light has all wavelength components that decompose the (n-1) kinds of color conversion dyes.   The method according to claim 11, wherein the dye-separated light is white light containing a near-ultraviolet component.   The exposure is performed a plurality of times, and a wavelength component that decomposes a color conversion dye of a k-th type (k represents an integer of 1 to n) is any of the dye-decomposed light used in the plurality of exposures. The method for producing a color conversion filter according to claim 9, wherein the color conversion filter is included.   The color conversion according to claim 13, wherein the exposure is performed n times, and the k-th exposure is performed using light including a wavelength component that decomposes the k-th color conversion dye. Manufacturing method of filter. A transparent substrate,
N types (n is an integer of 2 to 6) of color filter layers formed on a transparent substrate;
A dye layer that includes at least one color conversion dye and is integrally formed over the n types of color filter layers, wherein the at least one color conversion dye absorbs a part of a wavelength range of incident light. A color filter with a color conversion function, which emits light in a wavelength range different from the absorbed wavelength range.   The color filter with a color conversion function according to claim 15, wherein the dye layer also functions as a protective layer of the at least one color filter.   The color filter with a color conversion function according to claim 15, wherein the light incident on the dye layer is blue to blue-green light, and the at least one color conversion dye emits red light.   The color filter with a color conversion function according to claim 15, wherein the light emitted from the dye layer is white light.   The color filter with a color conversion function according to claim 15, wherein in the dye layer, the at least one color conversion dye is dispersed in a resin. The color filter with a color conversion function according to claim 15, further comprising a gas barrier layer covering the dye layer.

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