JP2004152749A - Color conversion member and el display using it - Google Patents

Color conversion member and el display using it Download PDF

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Publication number
JP2004152749A
JP2004152749A JP2003348687A JP2003348687A JP2004152749A JP 2004152749 A JP2004152749 A JP 2004152749A JP 2003348687 A JP2003348687 A JP 2003348687A JP 2003348687 A JP2003348687 A JP 2003348687A JP 2004152749 A JP2004152749 A JP 2004152749A
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color conversion
layer
color
light
conversion layer
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JP2003348687A
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Koji Arai
Masaaki Asano
井 浩 次 新
野 雅 朗 浅
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Dainippon Printing Co Ltd
大日本印刷株式会社
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Priority to JP2003348687A priority patent/JP2004152749A/en
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Abstract

PROBLEM TO BE SOLVED: To provide a color conversion member in which deterioration of color conversion function, prevention of reflection of external light, and color rendering properties are improved.
The color conversion layer includes a transparent substrate, a color conversion layer, and a color filter layer, and the color conversion layer converts incident light of each pixel into light of a different color from the incident light. And the two or more types of color conversion layers are arranged on the transparent substrate, and the other color conversion layer adjacent to or adjacent to the transparent substrate of any of the color conversion layers The color filter layer is formed between them.
[Selection diagram] None

Description

Background of the Invention

The present invention relates to a color conversion member, and more particularly to a color conversion member used for an electroluminescent display.

BACKGROUND ART In principle, an electroluminescent (EL) element has a structure in which an EL light emitting layer is sandwiched between an anode and a cathode. Actually, when an EL display is constructed using EL elements, (1) a method of arranging EL elements that emit light of each of the three primary colors, and (2) an EL element that emits white light is a color filter of the three primary colors. And (3) an EL element that emits blue light and a color conversion layer (CCM layer) that performs color conversion for blue → green and blue → red, respectively (CCM method).

  In the method (3) [CCM method], it suffices to use only an EL element that emits a single color having higher energy than the light to be converted. Therefore, like the EL display of the method (1), the EL element of each color is used. And eliminates the drawback that the white light utilization rate is low when color separation is performed by three primary color filters as in the EL display of the method (2). It is said that by increasing the conversion efficiency, the brightness of the display is improved.

  However, the luminous body used for forming the color conversion layer that converts the color from blue to green and from blue to red may be deteriorated by external light, excitation light leaking from the adjacent color conversion layer, or the like. The former can be dealt with by laminating a color filter layer between the color conversion layer and the transparent substrate as a support, or by attaching an ultraviolet shielding film to the transparent substrate. For, another measure is needed.

  Conventionally, the color conversion layer is thicker than the thickness of the light-shielding layer (referred to as “black matrix” in the present specification), and the thickness of the color conversion layer varies. It has been often pointed out that the incident light causes scattering or the like and light leaks to the adjacent color conversion layer. To solve such a phenomenon, Japanese Patent Application Laid-Open No. 10-241860 proposes polishing the color conversion layer.

  However, even if a means for polishing the color conversion layer together with the light-shielding layer is used, it is necessary to make the final thickness uniform. For this reason, from the necessity of providing a light-shielding layer thicker than usual, the width of the light-shielding layer has to be increased, and, when forming the color conversion layer, between other adjacent color conversion layers, In order to prevent the composition for forming from being mixed, it has been required to maintain a high position at the time of forming any of the color conversion layers.

Summary of the Invention

  The present inventor has recently made it easy to manufacture the color changing member by reducing the thickness of the color conversion layer and forming the height of the light-shielding layer low in the color conversion member. It has been found that it is possible to prevent deterioration of functions, prevent reflection of external light, and improve color rendering. The present invention is based on such findings.

Therefore, the color conversion member according to the present invention is:
A transparent base material, a color conversion layer, and a color filter layer,
The color conversion layer is to convert incident light of each pixel into emission light of a different color from the incident light, and two or more types of the color conversion layers are arranged on the transparent base material. Become
The color filter layer is formed between any of the color conversion layers and the transparent substrate side or another adjacent color conversion layer.

Detailed description of the invention

Aspects of the present invention In the first aspect of the present invention, on a transparent substrate, two or more types of fine color conversion layers that convert incident light of each pixel into outgoing light of a different color from the incident light While the color conversion layers in which are arranged are laminated, at least, any of the fine color conversion layers between the transparent substrate side of the fine color conversion layer and the adjacent other type of the fine color conversion layer A color conversion member for an EL display, wherein a color conversion section is configured by laminating filter layers is provided.

    In the present invention, in the first embodiment, at least one type other than that the fine color filter layer is laminated between the transparent substrate side and the adjacent other type of the fine color conversion layer A color conversion member is provided, in which a fine color filter layer is laminated on the transparent substrate side of the fine color conversion layer.

    In the present invention, in the first aspect, the transparent substrate is laminated with a black matrix having an opening, and the fine color conversion layer is laminated corresponding to the opening. , A color conversion member is provided.

    According to a second aspect of the present invention, in the first aspect, the color conversion layer is a first fine color conversion layer that converts incident light composed of blue light and green light into red emission light. A second fine color conversion layer that converts the light into green emission light, and a fine light transmission layer that transmits the incident light as it is, are arranged on the transparent substrate side of the first fine color conversion layer and A color conversion member is provided, in which a red fine color filter layer is laminated between adjacent fine color conversion layers of another type.

    According to the present invention, in the second aspect, there is provided a color conversion member in which a green fine color filter layer is further laminated on at least the fine light transmitting layer side of the second fine color conversion layer. .

    According to a third aspect of the present invention, a transparent color conversion layer corresponding to each of the fine color conversion layers is provided on the fine color conversion layer of the color conversion member described in each of the above aspects, via an overcoat layer if necessary. An EL display is provided in which an electrode layer, an EL light emitting layer, and a back electrode layer are stacked to form a light emitting section.

    In the present invention, the transparent member corresponding to each of the fine color conversion layers is provided on the fine color conversion layer of the color conversion member of the second aspect via an overcoat layer if necessary. An EL display is provided, in which an electrode layer, an EL light emitting layer that emits blue light and green light, and a back electrode layer are stacked to form a light emitting portion.

  A fourth aspect of the present invention is a color conversion layer in which two or more types of fine color conversion layers that convert incident light for each pixel into light of a color different from the incident light are arranged on a transparent base material. Of these, the other types of fine color conversion layers except one type are laminated to form a concave area where the one type of fine color conversion layer is to be formed, and then the transparent substrate on which the concave area is formed. On a material, a composition for forming a fine color filter layer and a fine color conversion layer for forming a fine color filter layer and a fine color conversion layer to be formed in the concave area, The composition for forming a filter layer is applied to the bottom and the wall surface of the concave area to be solidified, and then the composition for forming a fine color conversion layer is changed to the concave area to which the composition for forming a fine color filter layer is applied. Is at least filled Use to solidify, then, the production method of the color conversion member, wherein the two compositions to polish the applied surface above is provided.

  In the present invention, in the fourth aspect of the present invention, on the transparent substrate, two or more types of fine color conversion layer that converts incident light of each pixel into light of a different color from the incident light. Of the arrayed color conversion layers, the other types of the fine color conversion layers except one type are stacked to form a concave area where the remaining one type of the fine color conversion layer is to be formed. Among the two or more types of fine color conversion layers laminated on the transparent substrate side of at least one type of fine color conversion layer, a production method is provided.

  In the present invention, in the fourth aspect of the present invention, on the transparent substrate, first, after laminating a black matrix having an opening portion, laminated the fine color conversion layer and the fine color filter layer. A method of manufacturing is provided, comprising:

  In the present invention, in the fourth aspect of the present invention, the method of applying the composition for forming a fine color filter layer to the bottom and wall surfaces of the concave area and solidifying the composition by photolithography is performed. A manufacturing method is provided, comprising laminating the fine color filter layer on a bottom and a wall surface in the concave area using a photomask that acts only on a portion slightly wider than the width of the area. .

  A fifth aspect of the present invention is the method according to the fourth aspect of the present invention, wherein the color conversion member is manufactured, and then, on the fine color conversion layer, an overcoat layer is laminated as necessary, And a method of manufacturing an EL display, comprising sequentially laminating a transparent electrode layer, an organic EL light emitting layer, and a back electrode layer corresponding to each of the fine color conversion layers.

Embodiment of the Invention
The color conversion member and a manufacturing method thereof FIGS. 1 and 2 are views showing separately an example of a manufacturing process of the organic EL color conversion member 10 according to the present invention, the manufacturing process proceeds in the order of FIGS. 1-2.

  As shown in FIG. 1A, a transparent substrate 1 is prepared, and a black matrix 2 is laminated on the surface (the upper surface in the figure). In the black matrix 2, the light-shielding layer has an opening corresponding to each pixel. The black matrix 2 is formed by depositing a light-shielding material such as Cr on one surface by vapor deposition and patterning the same by photolithography, by a printing method using a resin composition containing a light-shielding pigment, or by using a resin thereof. This can be performed by patterning the composition using a photolithography method. In this specification, the term “opening portion” simply refers to the opening portion of the black matrix 2.

  The presence of the black matrix 2 can reduce the reflection of external light when viewed from the observation side, improve the contrast of images and images, and form each layer corresponding to the opening of the black matrix 2. This is preferred because

  As shown in FIG. 1B, the color filter layer 3 is provided on the second and fifth openings from the left of the openings of the black matrix 2 of the transparent substrate 1 on which the black matrix 2 is laminated. (G) is laminated. The color filter layer 3 (G) is a color filter layer for green and corrects green light coming from a color conversion layer provided on the color filter layer 3 (G). The color filter layer refers to a fine color filter layer corresponding to each of the openings of the black matrix 2, but actually, the color filter layer indicates a group of such fine color filter layers. Shall be. The same applies to the subsequent layers regarding the presence or absence of “fine”.

  The color filter layer 3 (G) can be formed by patterning using a coating composition or an ink composition colored in a predetermined color using a photolithography method, or by a printing method.

  In the case of performing full color display, a red color filter layer or a blue color filter layer may be formed as a color filter layer in addition to the green color filter layer. When the EL light emitting layer emits blue light, or blue light and green light, the blue color filter layer can obtain blue light without performing color conversion, and does not require special correction. Sometimes it may be omitted. Also, the green color filter layer and the red color filter layer may be omitted if the color conversion result by the color conversion layer does not cause any trouble.

  As shown in FIG. 1C, on the transparent substrate 1 on which the black matrix 2 and the green color filter layer 3 (G) are laminated, next to where the green color filter layer 3 (G) is provided, that is, The color conversion layer 4 (B) is formed in the first and fourth openings from the left side as viewed. The color conversion layer 4 (B) is originally a blue conversion layer for converting incident light from the EL light emitting layer to blue, but the light emitted from the EL light emitting layer is blue light, or blue light and green light. In this case, since blue light is obtained without performing color conversion, a blue conversion layer for converting incident light into blue may not be provided. However, since the other color conversion layers are relatively thick, if nothing is provided, the portion becomes a concave portion, and the uniformity of the thickness of the color conversion member (FIG. 2C) 10 is lost. Therefore, it is usually preferable to laminate a colorless and transparent layer (clear layer). In the present specification, such a configuration is sometimes referred to as a blue conversion layer including the case where a clear layer is formed.

  Therefore, if the color conversion layer 4 (B) is a literal blue color conversion layer, the color conversion layer 4 (B) is formed by a photolithography method or a printing method using a resin composition containing an organic luminescent material that converts incident light into blue. The clear layer can be formed by a photolithography method or a printing method using a transparent resin composition containing no organic luminous body.

  In the present specification, in the description given with reference to FIGS. 1 and 2, the respective areas for blue, green, and red are arranged in this order from the left side on the transparent substrate 1. Although it is assumed that the three primary colors are arranged repeatedly, on the screen of the actual EL display, these three primary color areas (fine areas) are arranged in various arrangements such as a stripe arrangement, a mosaic arrangement, and a triangular arrangement. And any arrangement may be used as long as the arrangement is averaged macroscopically.

  As shown in FIG. 1D, the color conversion layer 4 (B) in the drawing is on the right side, ie, on the second and fifth apertures from the left side, and the color conversion layer 4 (B) is already provided. The color conversion layer 4 (G) is formed on the filter layer 3 (G). The color conversion layer 4 (G) is essentially a green color conversion layer that converts incident light from the EL light emitting layer to green. The green color conversion layer 4 (G) can be formed by a photolithography method or a printing method using a resin composition containing an organic luminescent material that converts incident light into green. The color conversion layer 4 (B) and the color conversion layer 4 (R) are preferably formed to have the same thickness.

  As described above, since the green color filter layer 3 (G), the blue conversion layer 4 (B), and the green conversion layer 4 (G) are provided on the transparent substrate 1, On the second opening, a concave area is formed. Further, a gap may be formed between the blue conversion layer 4 (B) and the green conversion layer 4 (G), depending on the method and accuracy of forming these layers.

  As shown in FIG. 2A, from the side where the concave area is formed on the transparent substrate 1, the red color filter layer 3 (R) is placed on the bottom and the wall of the concave area, and the blue conversion layer 4 (B). On the green conversion layer 4 (G), and also in the gaps that may occur, the layers are laminated.

  Since the red color filter layer 3 (R) is preferably formed on the bottom and the wall of the concave area, a photolithography method or a printing method using a coating composition or ink composition colored in a predetermined color. However, it is simpler and more preferable to simply apply the composition to the entire surface, not limited to the concave area. Further, it is preferable that the red color filter layer 3 (R) is formed to have the same thickness as the green color filter layer 3 (G). Although it is easier to form the red color filter layer 3 (R) by applying it to the entire surface, as described later, a red conversion layer is further laminated and polished together with the red conversion layer. When removing the unnecessary portion, even if the red color filter layer 3 (R) remains on the blue conversion layer 4 (B) or the green conversion layer 4 (G) even if it is very small, full color display is hindered. Therefore, from the viewpoint of the reliable removal of the red color filter layer 3 (R) in the unnecessary portion, the red color filter layer 3 (R) is removed by photolithography using a photomask that acts only on a portion slightly wider than the width of the concave area. It is preferable to remove the color filter layer 3 (R) for use only in the substantially concave area, that is, only the portion laminated on the bottom and the wall surface. Even when the red color filter layer 3 (R) is formed only on the bottom of the concave area, it is preferable to use the photolithography method.

  After laminating the red color filter layer 3 (R), preferably after solidifying the red color filter layer 3 (R) to such an extent that the next layer is not hindered, at least the red color filter layer 3 (R) is solidified. The color conversion layer 4 (R) is filled in the concave area where (R) is laminated and laminated (FIG. 2 (b)). The color conversion layer 4 (R) is essentially a red conversion layer that converts incident light from the EL light emitting layer to red.

  The color conversion layer 4 (R) can be formed by a photolithography method or a printing method using a resin composition containing an organic luminous substance that converts incident light into red light. It is simpler and more preferable to simply apply the solution to the entire surface.

  The red color filter layer 3 (R) formed on the laminate thus obtained, which is laminated on the portion other than the bottom and the wall surface of the concave area, is finally unnecessary, and the layer other than the concave area is unnecessary. The color conversion layer 4 (R) laminated on the portion is also unnecessary. In FIG. 2B, the upper surface of the color conversion layer 4 (B) and the upper surface of the color conversion layer 4 (R) (the portion above the dotted line (indicated by 5) including them) is an unnecessary portion.

  By removing the portion above the dotted line 5 of the laminate in this state by polishing, as shown in FIG. 2 (c), the black matrix 2 having the openings is laminated on the transparent substrate 1. On the opening of the black matrix 2, only the blue conversion layer 4 (B), which may be a clear layer, is actually laminated in the blue area, and in the green area, The green color filter layer 3 (G) and the green conversion layer are simply laminated in order, and in the red area, the red conversion layer 4 (R) is placed between the transparent substrate and the color conversion layers on both sides. The red color filter layer 3 (R) is laminated through the red color filter layer 3 (R) and the red color filter layer 3 (R) is also placed in a gap which may be generated between the blue color conversion layer 4 (B) and the green color conversion layer 4 (G). Color filter layer 3 And R) is laminated, the color conversion member 10 for EL display is formed.

  2 (b) and 2 (c), the removal of the portion above the dotted line 5 has been described. However, the removal method further includes the following. Since the color conversion layers (B), 4 (G), and 4 (R) are actually laminated with margins on the periphery of the transparent base material, as described above, When the color filter layer (R) for red is laminated on the concave area, and then filled and laminated with the color conversion layer (R), the color conversion layer (B) and the blank portion without 4 (G) In some cases, these two layers are laminated on the transparent substrate 1, and these two layers laminated at this location may not be removed simply by polishing. In this case, the same height as the color conversion layers (B) and 4 (G) is provided on a portion of the transparent substrate 1 where the color conversion layers (B), 4 (G) and 4 (R) are not to be provided. When a red color filter layer (R) and a color conversion layer (R) are applied to the concave area, these two layers are applied on the photoresist layer. If so, these two layers can be removed even in the above-mentioned blank portion by polishing. The remaining photoresist layer can be removed by dissolution or the like as necessary.

  In the above description, the color conversion member for EL display in which the red color filter layer 3 (R) is laminated between the transparent substrate 1 side of the red conversion layer 4 (R) and the color conversion layers on both sides adjacent thereto is described. (Hereinafter referred to as “embodiment 1” in the present invention). However, in the present invention, the color conversion member for an EL display of the present invention covers the green color filter layer 3 (G) between the transparent substrate side of the green conversion layer 4 (G) and the adjacent color conversion layer. G) is also included (hereinafter, referred to as “aspect 2” in the present invention). In the case of the first embodiment, the red color filter layer 3 (R) is laminated between the transparent substrate 1 side of the red conversion layer 4 (R) and the color conversion layers on both sides adjacent thereto, so that the blue conversion layer ( In many cases, the effect of leakage light from the clear layer to the red conversion layer can be avoided, but the leakage light from the blue conversion layer to the green conversion layer still affects the green conversion layer. Therefore, a green color filter layer may be laminated on the blue conversion layer side of the green conversion layer. When the color filter layer for green color is laminated on the transparent substrate side of the green color conversion layer, the green color conversion layer may be laminated including the blue color conversion layer side of the green color conversion layer. Of course, the green color filter layer may be laminated on the transparent substrate side and the color conversion layer side on both sides. In addition, in order to laminate the green color conversion layer only at a limited place, it is preferable to perform the lamination by a photolithography method.

  In the embodiment 2, a black matrix 2 having an opening is laminated on the transparent substrate 1, and on the opening of the black matrix 2, a blue layer which may be a clear layer in the blue area is provided. The conversion layer is stacked, in the green area, the green conversion layer is stacked between the transparent substrate and between the color conversion layers on both sides via a green color filter layer, in the red area, From the black matrix 2 side, a red conversion layer is usually laminated with a red color filter layer, and a green color filter is also provided in a gap that may be generated between the blue conversion layer and the red conversion layer. The layers are stacked (actually filled) to form a color conversion member for an EL display. It is preferable that a red color filter layer is laminated on the blue conversion layer side of the red conversion layer.

  On the side where the color conversion layer of the color conversion member for an EL display of the present invention is laminated, if necessary, an element constituting an EL element is laminated via an overcoat layer on one surface, and the like, to thereby provide an EL display. It can be.

  The EL element is basically composed of a transparent electrode layer, an EL light emitting layer, and a back electrode layer laminated from the color conversion layer side corresponding to each of the fine color conversion layers. Any of a passive matrix and an active matrix may be used. If necessary, a base material different from that used for the sealing material and the color conversion member for EL display may be further laminated.

  The color conversion member for an EL display of embodiment 1 is very practically a blue area is a clear layer, a green area is a green conversion layer and a green color filter layer, and a red area is red. The conversion layer has a color filter layer for red between the transparent substrate side and the color conversion layers on both sides. It is most preferable that the color conversion member for an EL display of the first aspect be combined with an EL light emitting element that emits blue light and green light.

  When the color conversion member for an EL display according to the first aspect is combined with an EL light emitting element that emits blue light and green light, the blue light does not need to undergo color conversion, and is actually formed as a clear layer. The conversion layer does not contain an organic light emitting material for color conversion, and therefore does not deteriorate. The green light transmitted through the clear layer can be cut by providing a blue color filter layer. Next, the green conversion layer contains an organic light emitting material for color conversion, and although degradation occurs, even if the color conversion function deteriorates due to degradation, green light of incident light is transmitted as it is, so that green light It is possible to compensate for a decrease in the amount of emitted light, and this is not likely to cause a problem in practical use. Compared to this, the red conversion layer contains organic light-emitting materials for color conversion, so that deterioration occurs.In addition, even if incident light is transmitted, as in the green conversion layer, the red conversion layer contains a red light component. Therefore, a reduction in the amount of emitted red light occurs.

  Therefore, when the color conversion member for EL display of the first aspect is used in combination with an EL light emitting element that emits blue light and green light, the red conversion layer in the color conversion member for EL display is different from the other color conversion layers. Compared to the red conversion layer and the other adjacent color conversion layer, the red color filter layer has the highest energy in the visible region, although it is most susceptible to deterioration. Since blue light is not transmitted, deterioration of the red conversion layer due to light leaking from the adjacent color conversion layer can be suppressed.

1. Transparent Substrate The transparent substrate is a support for supporting the color conversion member for an EL display, and when the EL display is constructed, it is on the observation side thereof and also a support for supporting the entire organic display.

  The transparent substrate is roughly classified into an inorganic plate-shaped transparent substrate such as glass or quartz glass, an organic (eg, synthetic resin) plate-shaped transparent substrate such as an acrylic resin, or a transparent film made of a synthetic resin. Substrate. Very thin glass can also be used as a transparent film-like substrate. As the transparent substrate, it is preferable to use one having a high surface smoothness on the side on which the color conversion layer or the like is formed and having an average roughness (Ra) of 0.5 nm to 3.0 nm (5 μm square region). .

  Specific examples of the synthetic resin constituting the transparent substrate include: an acrylic resin such as a polycarbonate resin, a polyarylate resin, a polyether sulfone resin, a methyl methacrylate resin, a cellulose resin such as a triacetyl cellulose resin, an epoxy resin, or a cyclic olefin. Resin or cyclic olefin copolymer resin may be used.

2. Color conversion layer The color conversion layer is provided in correspondence with the opening portion of the black matrix and the color filter layer. For each pixel, each pixel has three types, blue, green, and red. Are regularly arranged. Among them, for blue, if the EL element originally emits blue light or (blue light / green light), there is basically no need to perform color conversion. Therefore, it is not necessary to provide anything, but as described above, it is preferable to form a clear layer having the same thickness as the color conversion layer for other colors as a dummy layer.

  Each part of the color conversion layer may be provided only in the opening part of the black matrix similarly to the part of each color of the color filter layer, but as shown in FIG. 1 or FIG. May be provided in a strip shape, or may correspond to the opening of the black matrix.

  Each of the red conversion layer and the green conversion layer is composed of a composition in which a red conversion illuminant that converts blue to red and a green conversion illuminant that converts blue to green are dissolved or dispersed in a resin.

Specific examples of the red conversion luminophore red conversion luminophore, 4-dicyano-2-methyl-6-(p-dimethylaminostyryl) -4H- cyanine dyes such as pyran, 1-ethyl-2- [4 Pyridine dyes such as-(p-dimethylaminophenyl) -1,3-butadienyl] -pyridium-perchlorate, rhodamine dyes such as rhodamine B or rhodamine 6G, or oxazine dyes, ZnS: Mn, ZnS: Mn / ZnMgS, a fluorescent pigment such as an orange pigment (for example, FA001 (trade name) manufactured by Shinhiloy) or a fluorescent pigment.

Specific examples of the green conversion luminophore green conversion luminophore, 2,3,5,6-1H, 4H-tetrahydro-8-trifluoromethyl quinolinium Gino (9,9a, 1-gh) coumarin, 3- ( Coumarin dyes such as 2'-benzothiazolyl) -7-diethylaminocoumarin or 3- (2'-benzimidazolyl) -7-N, N-diethylaminocoumarin; coumarin dyes such as Basic Yellow 51; Or a naphthalimide-based dye such as Solvent Yellow 116, a fluorescent dye or a fluorescent pigment of ZnS: Tb, or a yellow-green pigment (for example, FA005 (trade name) manufactured by Shinhiloy).

Specific examples of the resin for dissolving or dispersing the resin red conversion luminous body or the green conversion luminous body include polymethyl methacrylate resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, Examples thereof include transparent resins such as polyvinyl chloride resin, melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic resin, and polyamide resin. Alternatively, specific examples of the resin include an ionizing radiation curable resin having a reactive vinyl group such as an acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber (actually, an electron beam curable resin or UV curable resin, which is often the latter).

  The formation of the color conversion layer is performed by a photolithography method, and the above-mentioned red conversion luminous body or green conversion luminous body, and a resin, if necessary, are mixed with a solvent, a diluent, or an appropriate additive to form an ink. This may be done by preparing the composition and printing. The clear layer for blue is formed according to the above-described method, except that the composition or the ink composition used is obtained by removing the red conversion fluorescent dye or the green conversion fluorescent dye. The ratio of the resin and the red conversion luminous body or the green conversion luminous body in the color conversion layer is preferably such that the ratio of the resin to the luminous body is about 100: 0.3 to 100: 5 (by mass). The thickness is preferably about 5 μm to 20 μm. To fill the color conversion layer into the concave area, as in the case of forming the color filter layer in the concave area, use a coating method or use a relatively large amount of application such as discharging using a dispenser. It is preferable to carry out by a method capable of performing the following. When the concave area is filled as in the case of the color conversion layer (R), it is necessary to ensure that the thickness of the color conversion layer (R) after polishing is the same as that of the other color conversion layers. It is preferable to form it thicker.

  As a polishing method, in addition to using sandpaper or the like to which appropriate abrasive particles are scattered and adhered on a sheet, a chemical polishing method, a mechanical polishing method, or a mechanochemical polishing ("MCP") using them in combination. : Also referred to as chemical mechanical polishing “CMP”). The chemical polishing method is, for example, a cloth, a nonwoven fabric, or a polishing member made of a foam such as a polyurethane resin, and is supplied by supplying an etching liquid as an abrasive, and the mechanical polishing method includes, for example, Cloth, non-woven fabric, or a method using a foam such as polyurethane resin as an abrasive member and impregnated with fine powder of colloidal silica or cerium oxide as an abrasive, or a dispersion of colloidal silica or cerium oxide dispersed therein And the like.

  In any case, preferably, the object is rotated and the like, and the object and the polishing member are relatively moved, and the polishing member is brought into contact with the color conversion layer laminated on the surface, and polishing is performed as necessary. The polishing was performed while supplying the agent, and at least the color conversion layer filled in the concave area was polished so as to have the same height as the other color conversion layer, and the concave area was also filled on the other color conversion layer. When the color conversion layer and the color filter layer are laminated, it is preferable to surely remove them, including those layers.

3. Color Filter Layer The color filter layer is provided corresponding to the opening of the black matrix, and three types of blue, green and red are regularly arranged corresponding to each pixel. Each color portion of the color filter layer may be provided for each opening of the black matrix, but for convenience, provided in a strip shape from the near side to the far side in FIG. 1 or FIG. May be something. In a CCM type EL display, blue light emitted from an EL element layer is converted by a color conversion layer to generate light of three primary colors of blue light, green light and red light, so that a color image can be reproduced. However, it is preferable to provide a color filter layer in order to further correct these lights, transmit only light in a predetermined band, and enhance the color rendering properties of the EL display.

  The color filter layer may be formed by a photolithography method or by preparing an ink composition colored in a predetermined color and printing for each color. The thickness of the color filter layer 3 is about 1 μm to 2 μm. In order to provide the color filter layer from the bottom of the concave area to the wall surface, it is preferable to perform the coating method or a method capable of relatively increasing the amount of application such as discharging using a dispenser.

4. Black Matrix In the present invention, a black matrix may be preferably formed on a transparent substrate. The black matrix is formed so as to partition a light-emitting area for each pixel, prevent reflection of external light at a boundary between the light-emitting areas, and increase the contrast of an image and a video. Normally, the black matrix is formed in a pattern having openings, such as a vertical or horizontal grid or a grid in only one direction, which is composed of thin black lines. Light emission of the EL display reaches the observation side via the opening of the black matrix.

  In order to form a black matrix, first, a transparent base material is sufficiently washed, and then a metal thin film is formed using a metal such as chromium by various methods such as vapor deposition, ion plating, and sputtering. In this case, a metal thin film made of chromium is most preferable in consideration of optical density capable of sufficiently shielding light, washing resistance, processing characteristics, and the like. In order to form a black matrix from the formed metal thin film, a normal photolithography method or the like can be used.For example, a photoresist is applied to the surface of the formed metal thin film and covered with a pattern mask. A black matrix can be formed through the steps of exposure, development, etching, and cleaning.

  The black matrix can also be formed by using an electroless plating method, a printing method using a black ink composition, or the like. The thickness of the black matrix is about 0.2 μm to 0.4 μm when formed as a thin film, and about 0.5 μm to 2 μm when using a printing method.

  The photolithography method mentioned as one of the methods for forming the black matrix can be used for forming each layer of the color filter layer, forming each layer of the color conversion layer including the clear layer, and forming each layer. Applying the forming composition over the entire surface and solidifying it once, then applying a photoresist, or preparing a forming composition for forming each layer using a photosensitive resin composition It may be performed directly by applying the above.

5. Overcoat layer In the present invention, an overcoat layer may be preferably formed. The overcoat layer is a target on which each layer is laminated, and has a role of blocking the EL light emitting layer from each of the underlying layers, particularly, the color conversion layer that easily affects the life of the EL light emitting layer.

  The overcoat layer is made of a transparent resin, and as a specific resin, a resin similar to that described above as a resin constituting the color conversion layer is used, and if necessary, a solvent, a diluent, or a monomer, and the like. After mixing with an appropriate additive to form a photosensitive resin composition, this photosensitive resin composition is uniformly applied, dried, and then cured by irradiation with ionizing radiation. Alternatively, it can be formed by forming a normal coating composition that is not ionizing radiation-curable, applying the coating composition by an appropriate coating means, and then drying the coating composition. The thickness of the overcoat layer is preferably from 1 μm to 5 μm, although it depends on the unevenness of the lower layer, and it is preferable to form the overcoat layer so as to increase the surface smoothness.

6. On the transparent barrier layer overcoat layer, a transparent barrier layer may be laminated between the transparent electrode layer and the transparent electrode layer. The transparent barrier layer is preferably made of a thin film of an inorganic oxide, and can block transmission of air, particularly water vapor, from below to the EL light emitting layer provided as an upper layer. As the inorganic oxide, it is preferable to use silicon oxide, aluminum oxide, titanium oxide, silicon nitride, or the like, or an alloy of silicon oxide and silicon nitride. The thickness of the transparent barrier layer is about 0.03 μm to 3 μm.

Use of Color Changing Member The color conversion member according to the present invention can be used particularly for an EL display using an EL light emitting element. An EL element is generally composed of a transparent electrode layer, a light emitting layer, and a back electrode layer.

A. Transparent electrode layer The transparent electrode layer is for applying a voltage to the EL light emitting layer sandwiched between the back electrode layer and the light emitting layer to emit light at a predetermined position. As shown in FIG. 1 or FIG. 2, for example, as shown in FIG. 1 or FIG. 2, each electrode having a band-like shape having a width corresponding to the width of the opening portion of the black matrix is arranged in the left-right direction of FIG. Are arranged at an interval in the direction toward. The arrangement pitch is the same as the arrangement pitch of the apertures of the black matrix.

  The transparent electrode layer is composed of a metal oxide thin film having transparency and conductivity, and is composed of, for example, indium tin oxide (ITO), indium oxide, zinc oxide, stannic oxide, or the like. After forming a thin film having a uniform material, it is preferable to form the thin film by removing unnecessary portions by photolithography.

B. EL Light-Emitting Layer The EL light-emitting layer is a layer that emits a single color or a composite color, and the light-emitting body that forms the light-emitting layer may be any of inorganic and organic, and may have any color. That is, in the present invention, any luminous body may be used in order to obtain a desired luminescent color, and the luminescent layer may have either a single-color or a multi-color configuration.

Inorganic light- emitting material As the inorganic light-emitting material for forming the EL light-emitting layer according to the present invention, existing multicolor inorganic materials can be used with red, green, and blue as basic colors, and these are currently used. Can be used. Specific examples of the inorganic light-emitting body include SrGa 2 S 4 : Ce, CaGa 2 S 4 : Ce, which are proposed as blue fluorescent materials in JP-A-7-122364 and JP-A-8-134440. A thiogallate or thioaluminate blue light-emitting material having excellent color purity, such as BaAl 2 S 4 Eu, can be preferably used. Further, an orange pigment (for example, FA001 (trade name) manufactured by Shinhiloy), a yellow-green pigment (for example, FA005 (trade name) manufactured by Shinhiloy) and the like can be preferably used.

Organic Light-Emitting Material As the organic light-emitting material for forming the EL light-emitting layer according to the present invention, existing multicolor organic materials can be used with red, green and blue as basic colors, and these are currently used. Can be used.

  Specific examples of organic light-emitting materials capable of obtaining blue to blue-green light emission include benzothiazole-based, benzimidazole-based, and benzoxazole-based fluorescent whitening agents exemplified in JP-A-8-279394. Agents, metal chelated oxinoid compounds disclosed in JP-A-63-295695, styrylbenzene-based compounds disclosed in EP-A-0319881 and EP-A-0373582, JP-A-2-252793 Distyrylpyrazine derivatives disclosed in Japanese Patent Application Laid-open No. Hei. 3-388768 and aromatic dimethylidin-based compounds disclosed in European Patent No. 0388768 and JP-A-3-231970.

  Specifically, benzothiazoles are 2-2 ′-(p-phenylenedivinylene) -bisbenzothiazole and the like, and benzimidazoles are 2- [2- [4- (2-benzimidazolyl) phenyl]. Benzoxazoles such as vinyl] benzimidazole and 2- [2- (4-carboxyphenyl) vinyl] benzimidazole include 2,5-bis (5,7-di-t-pentyl-2-benzoxazolyl). 1,3,4-thiadiazole, 4,4′-bis (5,7-t-pentyl-2-benzoxazolyl) stilbene, or 2- [2- (4-chlorophenyl) vinyl] naphtho [ 1,2-d] oxazole and the like.

  Examples of metal chelated oxinoid compounds include 8-hydroxyquinoline-based metal complexes such as tris (8-quinolinol) aluminum, bis (8-quinolinol) magnesium, bis (benzo [f] -8-quinolinol) zinc, and dilithium epitaxy. Styrylbenzene-based compounds such as 1,4-di (2-methylstyryl) benzene, 1,4-bis (3-methylstyryl) benzene, 1,4-bis (4-methylstyryl) benzene, Distyrylbenzene, 1,4-bis (2-ethylstyryl) benzene, 1,4-bis (3-ethylstyryl) benzene, 1,4-bis (2-methylstyryl) -2-methylbenzene, or 1, 4-bis (2-methylstyryl) -2-ethylbenzene and the like can be exemplified.

  Distyrylpyrazine derivatives include 2,5-bis (4-methylstyryl) pyrazine, 2,5-bis (4-ethylstyryl) pyrazine, and 2,5-bis [2- (1-naphthyl)) vinyl] pyrazine 2,5-bis (4-methoxystyryl) pyrazine, 2,5-bis [2- (4-biphenyl) vinyl] pyrazine, or 2,5-bis [2- (1-pyrenyl) vinyl] pyrazine, Examples of the aromatic dimethylidin compounds include 1,4-phenylenedimethylidin, 4,4-phenylenedimethylidin, 2,5-xylenedimethylidylidine, 2,6-naphthylenedimethylidin, and 1,4. -Biphenylenedimethylidin, 1,4-p-terephenylenedimethylidin, 9,10-anthracenediyldylmethylidin, 4,4'-bis (2,2- -t- butylphenyl vinyl) biphenyl, 4,4'-bis (2,2-diphenyl vinyl) biphenyl, or it can be exemplified derivatives thereof.

  Specific examples of the organic light-emitting material constituting the light-emitting layer that emits blue light include a compound represented by the general formula (Rs-Q) 2-AL-OL described in JP-A-5-258860. Wherein L is a hydrocarbon of 6 to 24 carbon atoms including a benzene ring, OL is a phenylate ligand, Q is a substituted 8-quinolinolate ligand, Rs represents an 8-quinolinolate ring substituent selected to sterically hinder the binding of two or more substituted 8-quinolinolate ligands to the aluminum atom.)

  Specifically, bis (2-methyl-8-quinolinolate) (para-phenylphenolate) aluminum (III) or bis (2-methyl-8-quinolinolate) (1-naphtholate) aluminum (III) is exemplified. can do.

  The thickness of the EL light emitting layer is not particularly limited, but can be, for example, about 5 nm to 5 μm.

The optional EL light-emitting layer may typically be composed of a light-emitting layer alone containing the above-mentioned light-emitting body, but may further include the following layers as necessary. In the case of an organic light-emitting layer, the light-emitting layer may be formed such that a hole injection layer is provided on the transparent electrode layer side, or the light-emitting layer is provided with an electron injection layer on the back electrode layer side. In the case of an inorganic light emitting layer, the light emitting layer may be formed as an insulating layer provided on both sides of the light emitting layer.

Hole Injection Layer Materials constituting the hole injection layer include materials conventionally used as hole injection materials of non-conductive materials and known materials used for hole injection layers of EL devices. And any one of an organic substance and an inorganic substance may be used, which has either hole injection or electron barrier properties.

  Specific examples of the material constituting the hole injection layer include triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole Derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, polysilane-based, aniline-based copolymers, and conductive high molecular oligomers such as thiophene oligomers can be exemplified. Further, examples of the material for the hole injection layer include a porphyrin compound, an aromatic tertiary amine compound, and a styrylamine compound.

  Specifically, examples of the porphyrin compound include aromatic tertiary amines such as porphine, 1,10,15,20-tetraphenyl-21H, 23H-porphine copper (II), aluminum phthalocyanine chloride, and copper octamethylphthalocyanine. Examples of the compound include N, N, N ', N'-tetraphenyl-4,4'-diaminophenyl, N, N'-diphenyl-N, N'-bis- (3-methylphenyl)-[1,1 '-Biphenyl] -4,4'-diamine, 4- (di-p-tolylamino) -4'-[4 (di-p-tolylamino) styryl] stilbene, 3-methoxy-4'-N, N-diphenyl Aminostilbenzene, 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl, or 4,4 ′, 4 ″ -tris [N- (3 Methylphenyl) -N- phenylamino] triphenylamine, it can be exemplified.

  The thickness of the hole injection layer is not particularly limited, but may be, for example, about 5 nm to 5 μm.

Electron injection layer Specific examples of the material constituting the electron injection layer include nitro-substituted fluorene derivatives, anthraquinodimethane derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, heterocyclic tetracarboxylic anhydrides such as naphthalene perylene, and carbodiimide. Also known as fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxadiazole derivatives, or thiazole derivatives in which the oxygen atom of the oxadiazole ring of an oxadiazole derivative is replaced with a sulfur atom, an electron-withdrawing group Examples thereof include a quinoxaline derivative having a quinoxaline ring, a metal complex of an 8-quinolinol derivative such as tris (8-quinolinol) aluminum, a phthalocyanine, a metal phthalocyanine, or a distyrylpyrazine derivative.

  The thickness of the electron injection layer is not particularly limited, but may be, for example, about 5 nm to 5 μm.

Insulating Layer Specific examples of the material constituting the insulating layer used in the case of the inorganic light emitting layer include nitrides such as Si 3 N 4 R and AlN, or SiO 2 , Ta 2 O 5 , Al 2 O 3 , and Y. Examples include oxides such as 2 O 3 , TiO 2 , BaTiO 3 , BaTa 2 O 6 , PbNb 2 O 6 , PbTiO 3 , PbZrO 3 , SrTiO 3 , and mixtures thereof. The thickness of the insulating layer is not particularly limited, but may be, for example, about 1 μm to 1000 μm.

C. Back electrode layer The back electrode layer forms the other electrode for causing the EL light emitting layer to emit light. The back electrode layer is made of a metal, an alloy, or a mixture thereof having a work function as small as about 4 eV or less. Specific examples thereof include sodium, sodium-potassium alloy, magnesium, lithium, a magnesium / copper mixture, a magnesium / silver mixture, a magnesium / aluminum mixture, a magnesium / indium mixture, an aluminum / aluminum oxide (Al 2 O 3 ) mixture, and indium. Or a lithium / aluminum mixture, a rare earth metal, or the like, and more preferably, a magnesium / silver mixture, a magnesium / aluminum mixture, a magnesium / indium mixture, an aluminum / aluminum oxide (Al 2 O 3 ) mixture, or lithium. / Aluminum mixture.

  Such a back electrode layer preferably has a sheet resistance of several hundred Ω / cm or less, and has a thickness of preferably about 10 nm to 1 μm, and more preferably about 50 to 200 nm.

  In addition to the above, the EL element may have an insulating layer on the transparent electrode layer corresponding to the black matrix. Further, a partition which functions as a mask when the EL light-emitting layer and the back electrode layer are formed by a vapor phase method such as an evaporation method may be provided over the insulating layer.

FIG. 1 is a diagram showing a color conversion member and the first half of a manufacturing process thereof. FIG. 2 is a diagram showing the color conversion member and the latter half of the manufacturing process.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Transparent base material 2 Black matrix 3 Color filter layer 4 Color conversion layer 10 Color conversion member

Claims (13)

  1. A transparent substrate, a color conversion layer, a color conversion member composed of a color filter layer,
    The color conversion layer is to convert incident light of each pixel into emission light of a different color from the incident light, and two or more types of the color conversion layers are arranged on the transparent base material. Become
    A color conversion member comprising the color filter layer formed between one of the color conversion layers and the transparent substrate side or another adjacent color conversion layer.
  2.   In addition to the color filter layer formed between the transparent substrate side and the adjacent color conversion layer, a color filter layer formed on the transparent substrate side of at least one type of color conversion layer The color conversion member according to claim 1, wherein
  3.   The color conversion member according to claim 1, wherein a black matrix having an opening is further formed on the transparent substrate, and the color conversion layer is formed on the opening. .
  4. Two or more types of the color conversion layers convert an incident light composed of blue light and / or green light into red emission light, and a second color conversion layer convert the incident light into green emission light. Color conversion layer, and a light transmission layer that transmits the incident light as it is,
    4. The red color filter layer according to claim 1, wherein a red color filter layer is formed between the first color conversion layer and the transparent substrate side or another adjacent color conversion layer. 5. Color conversion member.
  5.   The color conversion member according to claim 4, wherein a green color filter layer is further formed on the light transmission layer side of the second color conversion layer.
  6.   The color conversion member according to any one of claims 1 to 5, which is used for an EL display.
  7.   A layer of a transparent electrode layer, an EL light emitting layer, and a back electrode layer, corresponding to each of the color conversion layers, on the color conversion layer of the color conversion member according to any one of claims 1 to 5. An EL display in which a formed light emitting portion is formed.
  8.   The EL display according to claim 7, wherein the light emitting unit is formed on the color conversion layer of the color conversion member via an overcoat layer.
  9. On a transparent substrate, among the color conversion layers in which two or more types of color conversion layers are arranged, to form at least one type of color conversion layer except for one type,
    Here, the color conversion layer converts incident light of each pixel into light of a color different from the incident light,
    Forming a concave area in which the one type of color conversion layer is to be formed;
    On the transparent substrate on which the concave area is formed, the color filter layer forming composition is applied to the bottom and the wall of the concave area and cured.
    Applying a composition for forming a color conversion layer to fill the concave area and curing, and polishing the surface on which the two compositions have been applied and cured. Manufacturing method.
  10.   The forming of the concave area further includes forming a color filter layer on a transparent substrate side of at least one type of color conversion layer among the two or more types of color conversion layers formed. 10. The production method according to 9.
  11.   The method according to claim 9, further comprising forming a black matrix having an opening before forming the two or more color conversion layer colors or the color filter layer.
  12.   The means for applying and solidifying the color filter layer forming composition on the bottom and wall surfaces of the concave area is performed by a photolithography method using a photomask that acts only on a portion slightly wider than the width of the concave area. The production method according to any one of claims 9 to 11, wherein
  13. The color conversion member is manufactured by the manufacturing method according to any one of claims 9 to 12,
    On the color conversion layer, if necessary, an overcoat layer is formed,
    A method for manufacturing an EL display, further comprising forming respective layers of a transparent electrode layer, an EL light emitting layer, and a back electrode layer corresponding to each of the color conversion layers.
JP2003348687A 2002-10-08 2003-10-07 Color conversion member and el display using it Pending JP2004152749A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008001660A1 (en) * 2006-06-29 2008-01-03 Idemitsu Kosan Co., Ltd. Color conversion substrate and color display
US7417368B2 (en) 2002-10-18 2008-08-26 Ifire Technology Corp. Color electroluminescent displays with thick film dielectric layer between electrodes
WO2010150353A1 (en) * 2009-06-23 2010-12-29 富士電機ホールディングス株式会社 Flat panel display, manufacturing intermediate therefor, and method of manufacturing same
JP2014123579A (en) * 2005-11-02 2014-07-03 Ifire Ip Corp Electroluminescent display
KR20170026950A (en) * 2015-08-31 2017-03-09 엘지디스플레이 주식회사 Organic Light Emitting Diode Display Device And Method Of Fabricating Organic Light Emitting Diode Display Device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7417368B2 (en) 2002-10-18 2008-08-26 Ifire Technology Corp. Color electroluminescent displays with thick film dielectric layer between electrodes
US7579769B2 (en) 2002-10-18 2009-08-25 Ifire Ip Corporation Color electroluminescent displays including photoluminescent phosphor layer
JP2014123579A (en) * 2005-11-02 2014-07-03 Ifire Ip Corp Electroluminescent display
WO2008001660A1 (en) * 2006-06-29 2008-01-03 Idemitsu Kosan Co., Ltd. Color conversion substrate and color display
WO2010150353A1 (en) * 2009-06-23 2010-12-29 富士電機ホールディングス株式会社 Flat panel display, manufacturing intermediate therefor, and method of manufacturing same
KR20170026950A (en) * 2015-08-31 2017-03-09 엘지디스플레이 주식회사 Organic Light Emitting Diode Display Device And Method Of Fabricating Organic Light Emitting Diode Display Device
KR101723880B1 (en) * 2015-08-31 2017-04-07 엘지디스플레이 주식회사 Organic Light Emitting Diode Display Device And Method Of Fabricating Organic Light Emitting Diode Display Device

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