DE102004039695B4 - Process for the preparation of a color conversion filter - Google Patents

Abstract

Process for producing a color conversion filter, characterized by the following steps:
Forming color filter layers (2) on a transparent substrate (1);
Forming a dye layer (3) containing a color conversion dye (CCM) on the color filter layers (2) and on the transparent substrate (1); and
Exposing the dye layer (3) through the transparent substrate (1) and the color filter layers (2) using dye-decomposing light, whereby color conversion layers (4) are formed at positions corresponding to the color filter layers (2);
wherein the color conversion dye (CCM) is decomposed by light outside a wavelength range transmitted by the color filter layers (2),
wherein the dye-decomposing light contains a wavelength region which decomposes the color conversion dye (CCM) and
wherein the color conversion layers (4) emit light by wavelength distribution conversion that is transmitted through the color filter layers (2).

Description

Technical field of the invention

The The invention relates to a method for producing a color conversion filter, which allows a multi-color display. The color conversion filter can be used for the display in image sensors, PCs, word processor, TV (TV) and fax machines, Audio, video and car navigation equipment, electronic desktop computers, equipment for mobile Terminals, for industrial and technical measuring etc. are used.

State of the art

In The last few years have been with regard to a method of creating multi-color or full color displays (multi-color or full-color display) investigations carried out regarding a color conversion method in which color-converting Dyes that are near ultraviolet, blue, teal or white Absorb light, cause a conversion of the wavelength distribution and Emit light in the visible range, be used as a filter (see Patent Documents 1 and 2). In case of using the color conversion method the color of the light emitted by the light source is not on White limited and therefore the degree of freedom in choosing the light source elevated become. For example, an organic EL light emitter (EL = Electroluminescence) that emits blue light, and green and red light can by the wavelength distribution conversion to be obtained. Thus, investigations were carried out for possibility the construction of a full color luminescence type display, for which a light source with improved efficiency can be used can, and even low energy radiation, such as near ultraviolet or visible light can be used (see Patent Document 3).

• Patentdokument 1: JP-A-8-279394
• Patentdokument 2: JP-A-8-286033
• Patentdokument 3: JP-A-9-80434
• Patentdokument 4: JP-A-11-279426
• Patentdokument 5: JP-A-2000-44824
• Patentdokument 6: JP-A-2001-164245
• Patentdokument 7: JP-A-2002-231450
• Patentdokument 8: JP-A-5-134112
• Patentdokument 9: JP-A-7-218717
• Patentdokument 10: JP-A-7-306311
• Patentdokument 11: JP-A-5-119306
• Patentdokument 12: JP-A-7-104114
• Patentdokument 13: JP-A-7-48424
• Patentdokument 14: JP-A-6-300910
• Patentdokument 15: JP-A-7-128519
• Patentdokument 16: JP-A-9-330793
• Patentdokument 17: JP-A-8-27934
• Patentdokument 18: JP-A-5-36475

A significant problem for the practical application of a color display is to provide a color conversion filter which enables a detailed color display and is stable in color fidelity, etc. for an extended period of time, and also has high color conversion efficiency. However, when the concentration of the color-converting dyes is increased to increase the color conversion efficiency, a drop in the efficiency due to the so-called concentration quenching and decomposition of the color-converting dyes occurs over time, etc., and therefore the present situation is that the desired color conversion efficiency is obtained by increasing the thickness of the color-converting layers containing the color-converting dyes. Concerning the prevention of concentration quenching and decomposition of color-converting dyes, studies have been made to introduce a bulky substituent on the dye core (see Patent Documents 4 to 6). Further, in order to prevent the decomposition of color-converting dyes, admissions for blending a quenching substance have been made (see Patent Document 7).

• Patent Document 1: JP-A-8-279394
• Patent Document 2: JP-A-8-286033
• Patent Document 3: JP-A-9-80434
• Patent Document 4: JP-A-11-279426
• Patent Document 5: JP-A-2000-44824
• Patent Document 6: JP-A-2001-164245
• Patent Document 7: JP-A-2002-231450
• Patent Document 8: JP-A-5-134112
• Patent Document 9: JP-A-7-218717
• Patent Document 10: JP-A-7-306311
• Patent Document 11: JP-A-5-119306
• Patent Document 12: JP-A-7-104114
• Patent Document 13: JP-A-7-48424
• Patent Document 14: JP-A-6-300910
• Patent Document 15: JP-A-7-128519
• Patent Document 16: JP-A-9-330793
• Patent Document 17: JP-A-8-27934
• Patent Document 18: JP-A-5-36475

US 2002/0071071 A1 discloses a color conversion filter and a color conversion filter manufacturing method using a common mask lithography method both for patterning the different color filter layers and for patterning the different color conversion layers.

EP 1 383 172 A2 discloses a method of manufacturing a color conversion filter using a photobleach process of the dye layer. The photo-bleaching process is not applied through different color filter layers.

US 2004/0051781 A1 and US 5,909,081 A disclose color filters with color conversion function comprising a transparent substrate; different color filter layers formed on the transparent substrate and a dye layer containing at least one color conversion dye formed integrally with and covering the different color filter layers. In the described color conversion filter, the at least one color conversion dye absorbs light in a part of the wavelength range of the incident light and emits light in a wavelength range other than the absorption wavelength range.

Object of the invention

Around the level of detail of a multicolour or full color display you have to increase a lot using the color conversion method create accurate image patterns of the color-converting layers (patterning). However, if the pattern generation is carried out such that, for example the width of each line in the pattern is smaller than the film thickness of the color-converting Layers, there are problems in terms of reproducibility the pattern outline and the deformation of the pattern during subsequent stages of manufacture on. In case the Pattern generation is carried out using conventional photolithography, are as well an application stage, an exposure stage, while the mask is aligned is, and a development level for each color of the color-converting Layers required. For example, in case of a full color display is to be obtained, at least red, green and blue color converting Layers required, and therefore requires the manufacturing process many levels and is complex.

It is therefore an object of the invention, a process for the preparation a color conversion filter, wherein the manufacturing process can be simplified and also a very detailed patterning is possible.

Solution of the task

A method for producing a color conversion filter according to a first embodiment of the invention is characterized by the following steps:
Forming color filter layers on a transparent substrate,
Forming a dye layer containing a color conversion dye on the color filter layers, and
Exposing the dye layer through the transparent substrate and the color filter layers using dye-decomposing light,
whereby color conversion layers are formed in positions corresponding to the color filter layers, and wherein the color conversion dye is decomposed by light outside a wavelength range transmitted by the color filter layers, the dye decomposing light contains a wavelength component which decomposes the color conversion dye, and the color conversion layers emit light by wavelength distribution conversion, which is transmitted through the color filter layers.

A method for producing a color conversion filter according to a second embodiment of the invention is characterized by the following steps:
Forming color filter layers of n types on a transparent substrate;
Forming a dye layer containing n - 1 types of color-converting dyes on the color filter layers of n types, and
Exposing the dye layer through the transparent substrate and the color filter layers using dye-decomposing light,
whereby m-th type color conversion layers are formed in positions corresponding to m-th type color filter layers, where n is a number of 2 to 6 and m is values of all numbers of 1 to n-1, each of n types of the color filter layers Transmits light in a different wavelength range, the m-th type of color conversion dye is decomposed by light not transmitted by the m-th type color filter layers, and the m-th type color conversion layers emit light by wavelength distribution conversion from that of the m-th type color filter layers is allowed through. In the present embodiment, it may be provided that the dye layer further contains an n-th type of color conversion dye, color conversion layers of the n-th type are formed by the exposure at locations corresponding to the n-th type color filter layers, the n-th type the color conversion dye is decomposed by light which is not transmitted by the n-th type color filter layers, and the n-th type of the color conversion dyes emits light by wavelength distribution conversion that is transmitted through the n-th type color filter layers.

One Color filter with color conversion function according to a third embodiment the invention is characterized in that it is a transparent substrate, Color filter layers of n types (where n is a number from 2 to 6), which are formed on the transparent substrate, and a dye layer comprising at least one color-converting dye, the is integrally formed with the color filter layers of the n types and this covers, wherein the at least one color-converting dye Light in a part of the wavelength range of the incident light and absorbs light in one of the wavelength range the absorption emitted different wavelength range.

Effect of the invention

As described above according to the manufacturing method of the first and second embodiments the invention very detailed color conversion layers by self-alignment be formed using color filter layers as masks. According to the invention Need imaging the color-converting layers by photolithography, eliminated, whereby the manufacturing process can be shortened. Farther For example, color conversion layers of increased thickness become integral with an area compensation Therefore, even if color conversion layers formed with a width that is narrow in comparison with the thickness , misformation, etc. of the color conversion layers are suppressed can. According to the inventive method Thus, a color conversion filter can be made in one Micro display (eg in the viewfinder of a video camera) can be used can.

Further has the color filter of the third embodiment of the invention with Color conversion feature special advantages as a color filter for ads. In this embodiment is for Light that is independently controllable Light sources in positions that exist in a matrix form Sub-pixels correspond to the hue of the emitted light through the dye layer changes, around white To provide light that enters the color filter layers of the sub-pixels. As a result, unlike the case where color conversion layers are present according to the colors of the respective sub-pixels, identical light in each of the color filter layers of the different Colors and thus eliminates the need for efficiency the color conversion for to consider the color conversion layers of each of the colors when the light sources are driven, and the circuits to Drive the light sources can so simplified and thus the costs are reduced. As each of the arranged in the matrix form light sources under identical conditions can be driven, the problem can also be suppressed, that only Light source, which correspond to a certain color, in prolonged bustle deteriorate, and thus the hue of the display can be over a long time Time to be maintained.

Embodiments of the invention

1 shows a first embodiment of a method for producing a color conversion filter according to the invention. 1 (a) shows a laminate, wherein a first filter layer 2 and a first dye layer 3 containing a color converting colorant (CCM) on a transparent substrate 1 were arranged.

The transparent substrate 1 must be transparent to visible light (wavelength 400 to 700 nm), preferably to light that is converted by color conversion layers 4 was subjected. In addition, the transparent substrate should be 1 be able to withstand the conditions (solvents, temperature, etc.) involved in the formation of the color conversion layers 4 and other layers provided as required (described later), and moreover, preferably have excellent dimensional stability. Preferred materials for the transparent substrate 1 include glasses and resins such as polyethylene terephthalate and polymethylmethacrylate. A borosilicate glass, a blue plate glass or the like is particularly preferable.

• (1) Zusammensetzungen, die ein acrylisches polyfunktionelles Monomer oder Oligomer mit einer Mehrzahl von Acryloylgruppen oder Methacryloylgruppen und einem Photopolymerisationsinitiator enthalten,
• (2) Zusammensetzungen, die einen Polyvinylzimtsäureester und einen Sensibilisator enthalten, und
• (3) Zusammensetzungen, die ein kettenförmiges oder cyclisches Olefin und ein Bisazid enthalten (ein Nitren wird erzeugt, und das Olefin wird vernetzt). Die Farbfilterschichten können auch beispielsweise unter Verwendung eines im Handel verfügbaren Farbfiltermaterial für Flüssigkristalle gebildet werden (z. B. ein Color Mosaic, Hersteller Fujifilm Arch Co., Ltd.).

The color filter layers 2 are layers that only transmit light in a desired wavelength range. In the complete color conversion filter are the color filter layers 2 effective for blocking light from a light source that does not have wavelength distribution conversion through the color conversion layers 4 and also improve the color purity of the light passing through the color conversion layers 4 was subjected to the wavelength distribution conversion. In addition, the color filter layers act 2 in the present embodiment as a mask in patterning the dye layer 3 to produce the color conversion layers in step (b) described below 4 to build. The color filter layers 2 contain a dye and a photosensitive resin. Preferably, a pigment having high lightfastness is used as the dye. For example, photosensitive resins include

• (1) Compositions containing an acrylic polyfunctional monomer or oligomer having a plurality of acryloyl groups or methacryloyl groups and a photopolymerization initiator,
• (2) compositions containing a polyvinyl cinnamic acid ester and a sensitizer, and
• (3) Compositions containing a chain or cyclic olefin and a bisazide (a nitrene is generated and the olefin is crosslinked). The color filter layers may also be formed using, for example, a commercially available liquid crystal color filter material (for example, a Color Mosaic, manufactured by Fujifilm Arch Co., Ltd.).

The color filter layers 2 have a thickness of 1 to 2.5 microns, preferably 1 to 1.5 microns, although this depends on the dye content. By adjusting the thickness in such a range, highly detailed patterning becomes possible and a transmission spectrum can be obtained in such a manner that the color filter layers 2 act both as a mask in step (b) and as a filter in the final color conversion filter.

The dye layer 3 is a layer containing a color conversion dye and a matrix resin. The color conversion dye is a dye that subjects incident light to the wavelength distribution conversion and emits light in a wavelength range that is different from the color filter layers 2 is permeable, and is preferably a dye which subjects near ultraviolet light or blue to blue-green light to the wavelength distribution conversion and emits light in a wavelength region different from the color filter layers 2 is passed through (eg blue, green or red). If desired, the color conversion dye may also have a wavelength distribution conversion in that of the color filter layers 2 pass through the transmitted wavelength range. In addition, the color conversion dye is selected from dyes which are decomposed by the transparent substrate 1 transmitted light, but not decomposed by the color filter layers 2 transmitted light. Therefore, it is important that no colored decomposition products are generated when the dye passes through from the transparent substrate 1 transmitted light is decomposed. Especially, it is an essential condition that no absorption occurs in the wavelength region obtained by the wavelength distribution conversion. The reason for this is that when light absorption occurs in this wavelength range, the light conversion efficiency drops. Further, even if no light absorption occurs in this wavelength region, colored decomposition products would cause undesirable coloration of the obtained color conversion filter, which is undesirable.

To Color conversion dyes that have light in the blue to blue-green range absorb and emit red light include, for example, dyes rhodamine type such as rhodamine B, rhodamine 6G, rhodamine 3B, rhodamine 101, rhodamine 110, sulforhodamine, basic violet 11 and basic Red 2, cyanine type dyes, pyridine type, dyes such as 1-ethyl-2- [4- (p-dimethylaminophenyl) -1,3-butadienyl] -pyridinium perchlorate (Pyridine 1) and oxazine-type dyes.

To Color conversion dyes that have light in the blue to blue-green range absorb and green light emit, belong for example, coumarin-type dyes such as 3- (2'-benzothiazolyl) -7-diethylaminocoumarin (Coumarin 6), 3- (2'-benzoimidazolyl) -7-diethylaminocoumarin (Coumarin 7), 3- (2'-N-methylbenzoimidazolyl) -7-diethylaminocoumarin (Coumarin 30) and 2,3,5,6-1H, 4H-tetrahydro-8-trifluoromethylquinolizino- (9,9a, 1-gh) coumarin (Coumarin 153) and Basic Yellow 51, which is a coumarin dye-type dye and also naphthalimide type dyes such as Solvent Yellow 11 and Solvent Yellow 116.

Examples of fluorescent dyes that emit light in the near ultraviolet or absorb visible area and emit blue light include coumarin type dyes such as coumarin 466, coumarin 47, coumarin 2 and coumarin 102.

Other than the above-mentioned dyes, any of various dyes (direct dyes, acid dyes, basic dyes, disperse dyes, etc.) may be used, provided that (1) the dye can perform the desired wavelength distribution conversion, (2) the dye passes through transparent substrate 1 transmitted light is decomposed but not decomposed by the color filter layers 2 transmitted light, and (3) no colored decomposition products are formed when the dye is decomposed by light.

To matrix resins that are in the dye layer 3 can be used include those obtained by curing the photosensitive resin used in the above-described color filter layers and also thermoplastic resins, such as polycarbonates, polyesters (polyethylene terephthalate, etc.), polyethersulfones, polyvinyl butyral, polyphenylene ethers, polyamides, polyetherimides, norbornene resins, methacrylic resins, isobutylene maleinanhydride copolymer resins, cyclic olefin resins, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer resins, alkyd resins and aromatic sulfonamide resins, thermosetting resins such as epoxy, phenol, urethane, acrylic, vinyl ester, imido, urea and melamine resins, and hybrid polymers such as polystyrene, polyacrylonitrile, a polycarbonate or the like, and a trifunctional or tetrafunctional alkoxysilane. A mixture of such resins may also be used as the matrix resin.

In the invention, it is preferable to use at least 0.2 μmol, more preferably 1 to 20 μmol, still more preferably 3 to 15 μmol of the color conversion dye per 1 g of the matrix resin used. Furthermore, the dye layer 3 (ie the color conversion layers 4 and a leveling layer 5 ) has a thickness of at least 5 μm, preferably 7 to 15 μm. As a result, a color-converted output light having a desired strength can be obtained. Furthermore, if desired, the dye layer 3 contain a plurality of dyes.

In an exposure level of the 1 (b) the exposure takes place from the side of the transparent substrate so that the light passes through the color filter layers 2 occurs and the dye layer 3 reached. The light used in the exposure contains a wavelength component similar to that in the dye layer 3 contained dye decomposed, but from the color filter layers 2 is absorbed. For example, in the case of producing red color conversion layers 4 the color filter layers 2 red and light is used with a wavelength component below 600 nm. Similar are in the case of the production of green conversion layers 4 the color filter layers 2 green and exposure uses light with a wavelength component below 500 nm. Further, in the case of producing blue conversion layers 4 the color filter layers 2 blue and light or near ultraviolet radiation having a wavelength component below 400 nm is used in the exposure. In either case, the exposure may also be performed using white light containing the above-mentioned wavelength component.

The light used in the exposure should have a substantially higher intensity than the intensity of the light to be used in the wavelength distribution conversion performed by the formed color conversion filter. Preferably, light having an intensity of at least 0.05 W / cm ² , more preferably at least 1 W / cm ² , is formed on the surface of the transparent substrate 1 used, on which the light is incident, although it depends on the color conversion dye used, etc. The exposure time depends on the desired degree of decomposition of the color conversion dye and can be determined by a person skilled in the art. By using light of high intensity, the color conversion dye can be decomposed in the desired areas in this way.

When Light source can be any in the relevant technical field known light source are used, for example, a halogen lamp, a metal halide lamp, an incandescent lamp, an electric discharge lamp, a mercury lamp or a laser; however, it should be a light source chosen which meets the wavelength conditions given above.

When the above-described exposure is performed, the color conversion dye decomposes in the area over each of the color filter layers 2 not one, but in areas where no color filter layer 2 is available. As a result, as in 1 (C) shown becomes a color conversion layer 4 over each of the color filter layers 2 formed, and a colorless leveling layer 5 that does not contain a color conversion dye is formed in the areas where no color filter layer 2 is available. It should be noted that in the present embodiment, the color conversion layers 4 the same composition as the originally formed dye layer 3 to have.

A method for producing a color conversion filter according to a second embodiment of the invention is characterized by the following steps:
Forming color filter layers of n types on a transparent substrate,
Forming a dye layer containing color conversion dyes of n - 1 types on the color filter layers of n types, and
Exposing the dye layer through the transparent substrate and the color filter layers using dye-decomposing light to form m-th type color conversion layers at locations corresponding to the m-th type color filter layers, where n is a number from 2 to 6 and m is all numbers from 1 to n - 1, each of the n types of color filter layers transmitting light in a different wavelength range, the mth type of color conversion dyes being decomposed by light which is not transmitted by the mth type color filter layer, and the color conversion layers of the mth type by wavelength distribution conversion, emit light transmitted by the m-th type color filter layers. The case for n = 3 is in 2 shown.

2 (a) shows a laminate wherein first (red) color filter layers 2R , second (green) color filter layers 2G , third (blue) color filter layers 2 B and a dye layer 3 comprising a first color conversion dye R1 and a second color conversion dye Y1 formed on a transparent substrate.

Of the first color conversion dye R1 is a dye which is red light by wavelength distribution conversion emits, preferably a dye, the near ultraviolet Light or blue to blue-green Light of wavelength distribution conversion subjects and red light (in a wavelength range of 600 to 700 nm). Furthermore the first color conversion dye R1 is decomposed by light, the one wavelength component below 600 nm. The second color conversion dye Y1 is a dye that is green light (in a wavelength range from 500 to 600 nm) by wavelength distribution conversion, preferably a dye that has near ultraviolet or blue to blue-green light the wavelength distribution conversion subject and green Emitted light. Further, the second color conversion dye becomes Y1 is decomposed by light, which has a wavelength component below 500 nm contains. The various elements forming the laminate of this embodiment including the color conversion dyes can be formed using materials as in the first embodiment described.

2 B) shows an exposure step in which the exposure through the transparent substrate 1 and the color filter layers 2 of several types. The light used in the exposure contains at least components which together decompose the red conversion dye R1 and the green conversion dye Y1, specifically a wavelength component of 500 to 600 nm and a wavelength component below 500 nm. The exposure can also be performed using white light containing these wavelength components contains, be carried out.

During the exposure, red color filter layers leave 2R no wavelength component below 600 nm, and therefore neither the red conversion dye R1 nor the green conversion dye Y1 becomes part of the dye layer 3 decomposes over the red filter layers 2R lie. This is how the red conversion layers become 4R containing R1 and Y1 over the red filter layers 2R educated. In the present embodiment, the wavelength distribution conversion to red light in the red conversion layers 4R be carried out by the red conversion dye R1 alone. Instead, green light emitted from the green conversion dye Y1 may be subjected to the wavelength distribution conversion to red light by the red conversion dye R1.

Furthermore, leave the green filter layers 2G the wavelength component is from 500 to 600 nm, but not the wavelength component below 500 nm. As a result, in parts of the dye layer 3 that over the green filter layers 2G are positioned, 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. So are green conversion layers 4G containing Y1 over the green filter layers 2G educated. In the present embodiment, the wavelength distribution conversion becomes green light in the green conversion layers 4G only by the green conversion dye Y1.

Continue to leave the blue filter layers 2 B a wavelength component below 400 to 500 nm. As a result, in the above the blue filter layers 2 B positioned parts of the dye layer 3 both the red conversion dye R1 and the green conversion dye Y1 are decomposed by the wavelength component of 400 to 500 nm. In the in 2 The examples shown above include the blue filter layers 2 B formed layers 4B no color conversion dyes.

The color conversion filter obtained by the above-described exposure step is shown in FIG 2 (c) shown. In places where no color filter layer 2 is present, the red conversion dye R1 and the green conversion dye Y1 are both decomposed by the wavelength component of 400 to 500 nm, and therefore, the dye layer becomes 3 to a leveling layer 5 containing no color conversion dyes. If blue or blue-green light from the side of the color conversion layers 4 is irradiated on the color conversion filter, is red light, the onsschichten by the wavelength distribution conversion in the Rotkonversi 4R is generated through the red filter layers 2R and by the wavelength distribution conversion in the green conversion layers 4G generated green light is through the green filter layers 2G emitted. Furthermore, blue light will pass through the blue filter layers 2 B emitted.

In the present embodiment, the content of the color conversion dyes (n) in the color conversion-layers 4 and the thickness of the color conversion layers 4 as in the first embodiment. In addition, in turn, each of the color conversion layers 4 contain a plurality of dyes.

In the present embodiment, the dye layer 3 also contain a blue conversion dye B1 which emits blue light by wavelength distribution conversion from ultraviolet to visible light. As the blue conversion dye B1, it is preferable to use a dye which is decomposed by light or near ultraviolet radiation containing a wavelength component below 400 nm. In the exposure level of 2 B) the blue conversion dye B1 becomes in the parts of the dye layer 3 where color filter layers 2R . 2G and 2 B are present, not decomposed. So contain the blue conversion layers 4B the blue conversion dye B1. Furthermore, the color conversion layers also contain 4R and 4G the blue conversion dye B1. In this case, the red conversion dye R1 and / or the green conversion dye Y1 may further subject the blue light emitted from the blue conversion dye B1 to wavelength distribution conversion. Furthermore, if the light emitted by the light source used in the exposure contains a wavelength component below 400 nm, the blue conversion dye B1 becomes part of the dye layers 3 decomposes, where no color filter layer 2 exists, and therefore the compensation layer becomes 5 do not contain a color conversion dye. In the case that the light emitted from the light source does not contain a wavelength component below 400 nm, the equalization layer becomes 5 contain the blue conversion dye B1.

A variant of the present embodiment is in 3 shown. In 3 For example, the color conversion filter is formed using two exposure steps. This in 3 (a) The laminate shown is the same as that in 2 (a) shown. In a first exposure level, the in 3 (b) is shown, light is used which contains a wavelength component of 500 to 600 nm. This wavelength component is passed through the green color filter layers 2G permeates and decomposes the red conversion dye R1 into the over the green color filter layers 2G lying parts of the dye layer 3 , On the other hand, let the red color filter layer 2R and the blue color filter layer 2 B this wavelength component does not go through and therefore the red conversion dye R1 becomes in the parts of the dye layer 3 not decomposed, over the red and blue filter layers 2R and 2 B lie.

Then, in a second exposure step, the in 3 (c) is shown, light containing a wavelength component of 400 to 500 nm used. This wavelength component passes through the blue filter layers 2 B permeates and thus decomposes the red conversion dye R1 and the green conversion dye Y1 into the over the blue filter layers 2 B lying parts of the dye layer 3 , On the other hand, let the red filter layer 2R and the green filter layer 2G this wavelength component does not go through, and therefore the red conversion dye R1 and the green conversion dye Y1 become those over the red and green filter layers 2R and 2G not decomposed.

The in 3 (d) The color conversion filter shown by the two exposure steps described above has the same structure as in FIG 2 (c) shown. In the present variant, the number of exposure steps is larger, but in each of the exposure steps, a light source having a narrower emission wavelength range and a higher intensity can be used. Thus, the time required for each of the exposure levels can be shortened. It should be noted that in this variant, the order of the exposure steps is not fixed, but the exposure to the wavelength component of the shorter wavelength may instead be performed first.

Furthermore, in the present variant, the dye layer 3 Further, a blue conversion dye B1 which emits blue light by wavelength distribution conversion of ultraviolet ray or visible light. In this case, the blue conversion layers contain 4B the blue conversion dye B1.

As described above, according to the method of the present embodiment, a color conversion filter which provides the three colors red, green, and blue required for a full-color display can be obtained. By arranging a plurality of independently controllable light sources at locations corresponding to the locations of the color conversion layers, a multi-color display can be formed. Further, in the present embodiment, by self-alignment using color filter layers 2 that are thin and can be formed in the finest detail, as masks the color conversion layers 4 in the desired positions using a shorter manufacturing process. Furthermore, the resin matrix of the color conversion layers 4 and the leveling layer 5 a single integrated body that stays as it does as a dye layer 3 has been formed, and therefore, even in the case of color conversion layers 4 with a width that is narrow compared with the film thickness, formed a miss Forming the color conversion layers 4 be suppressed.

In the present embodiment A description has been given in the case of forming color conversion layers the three colors red, green and blue, but it should be noted that instead other colors can be used. About that can out if desired two types or 4 or more, preferably 2 to 6 types of color conversion layers be formed. In the case of formation of 6 types of color conversion layers, wherein the first to sixth color filter layers light in the first to sixth wavelength ranges let through in order from the longest wavelength to shorter, and the first to fifth Color conversion dyes by wavelength distribution conversion light with wavelengths emit, in turn, from the longest wavelength to the shortest It is preferred to provide that the first color conversion dye by light in the second wavelength range, the second color conversion dye by light in the third wavelength range etc. until the fifth Color conversion dye caused by light in the sixth wavelength range is decomposed. If the dye layer further has a sixth Contains color conversion dye, this should be chosen be that he by light in any of the first to sixth wavelength ranges not decomposed. The cases the formation of 2 to 5 types of color conversion layers are analogous to the above.

In the case of forming a plurality of types of color conversion layers 4 For example, a color conversion filter for so-called area color display can be formed only in certain zones where other color conversion layers than those in other zones are formed. Alternatively, a color conversion filter for the display may be formed by forming red, green and blue color conversion layers 4 with, for example, taking a rectangular or circular outline as a sentence and repeatedly arranging that sentence in a matrix outline or red, green and blue color conversion layers 4 each having a stripe outline and being parallel to each other, taking as a set and repositioning that set over the transparent substrate. Here, the color conversion layers of a certain color can also be arranged in a larger number or area than the color conversion layers of the other colors. Alternatively, a plurality of color conversion layers may be arranged according to a pattern, characters, letters, numbers, marks, or the like, and these may be displayed. Next as an alternative, a single color can be made using a single type of color conversion layer 4 can not be displayed by displaying two types of color conversion layers 4 be arranged with a suitable area ratio between them, divided into very small zones.

Furthermore, according to the method of the present embodiment, a gas barrier layer containing the dye layer may be formed 3 covered. The material for forming the gas barrier layer may be selected from materials having a high visible light transmittance (a transmittance of at least 50% in a range of 400 to 700 nm), Tg of at least 100 ° C and a surface hardness of at least 2H pencil hardness, and which none Deterioration of the function of the dye layer 3 or the underlying color conversion layers 4 cause. Preferred materials for forming the gas barrier layer include inorganic oxides / nitrides such as SiO _x , SiN _x , SiN _x O _y , AlO _x , TiO _x , TaO _x and ZnO _x .

Furthermore, if a gas barrier layer is formed in the method of the invention, the gas barrier layer may be a single layer or a multi-layer structure using a plurality of layers using a plurality of different materials. If a multilayer structure having a plurality of layers is used as the gas barrier layer, a plurality of inorganic oxide / nitride layers as above may be constructed one on top of the other. Instead, with the aim of further improving the flatness of the surface of the gas barrier layer, one or more layers of inorganic oxide (s) / nitride (s) as above and one or more layers of one or more organic materials may be built one on top of the other. Useful inorganic materials include, for example, imide-modified silicone resins (see, for example, Patent Documents 8 to 10), materials obtained by dispersing an inorganic metal compound (TiO ₂ , Al ₂ O ₃ , SiO ₂ , etc.) in an acrylic, polyimide, or acrylic resin Silicone resin (see Patent Documents 11 and 12), UV-curable resins such as epoxy-modified acrylate resins and acrylate monomer / oligomer / polymer resins containing reactive vinyl groups (see Patent Document 13), resist resins (see Patent Document 1, 14 to 16) or also inorganic compounds formed by a sol-gel method (see Non-Patent Reference 1, Patent Document 17) and photocurable and / or thermosetting resins such as fluoro resins (see Patent Documents 16, 18).

For forming a gas barrier layer of materials such as those mentioned above, a method known in this technical field may be freely selected, for example a dry method (sputtering, Vapor deposition, CVD, etc.) or a wet process (spin coating, roll coating, casting, dip coating, etc.). In addition, in the case where a gas barrier layer is applied, it is preferable that the thickness of the gas barrier layer be small, so long as its effect as a sufficient barrier to gases (oxygen, water vapor, organic solvent vapors) to reduce the viewing angle dependency (changes in hue on changes in the viewing angle , etc.).

A color light-emitting conversion device can be obtained by combining a color conversion filter formed by the method of the present invention and a light-emitting part (light source). A freely selectable light source that emits light from the near ultraviolet to the visible region, preferably blue or blue-green light, may be used as the light-emitting part. Examples of such light sources include EL light emitting devices, plasma light emitting devices, cold cathode tubes, electric discharge lamps (high pressure or ultra high pressure mercury lamps), light emitting diodes (LEDs), etc. The light emitting part is on the color conversion layer side 4 arranged. Instead, the light-emitting part can be applied directly as a layer on the color conversion filter formed by the method according to the invention. In the case where a layer is directly applied to the light emitting part, it is particularly preferable that the upper surface of the color conversion filter formed by the method of the present invention be flat.

As an example of a light-emitting color conversion device according to the invention 4 an organic top-emission type EL display obtained by bonding (bonding) the color conversion filter to an organic EL device. On a substrate 10 , on which already TFTs 11 are formed as switching devices, an organic EL device is formed which has a compensating (flattening) film 12 , a lower electrode 13 , an organic EL layer 14 , an upper electrode 15 and a passivation layer 16 having. The lower electrode 13 is divided into a plurality of parts, and the parts are reflective electrodes that are one-to-one with the TFTs 11 are connected. The upper electrode 15 is a transparent electrode that is evenly formed over the entire surface. The various layers forming the organic EL device can be formed using materials and methods known in the art.

Continue to be on a transparent substrate 1 Blue, green and red color filter layers 2 B . 2G and 2R and blue, green and red color conversion layers 4B . 4G and 4R educated. Furthermore, a black mask 6 to improve the contrast between and around the color filter layers around. In the in 4 the example shown is the dye layer 3 as originally shaped, with none of the dyes contained therein being that of the black mask 6 is decomposed at corresponding points, and serves at these points as a flattening leveling layer.

Next, the organic EL device and the color conversion filter may be provided with a filler layer provided between them 22 aligned and bonded together, and finally the edge portions are sealed using an outer circumferential sealant layer (adhesive) 21 , whereby the organic EL display is obtained. In 4 For example, an active matrix drive type display is shown, but of course, a passive matrix drive type organic EL device may be used instead.

• (1) organische Lichtemissionschicht
• (2) Lochinjektionsschicht/organische Lichtemissionsschicht
• (3) organische Lichtemissionsschicht/Elektroneninjektionsschicht
• (4) Lochinjektionsschicht/organische Lichtemissionsschicht/Elektroneninjektionsschicht
• (5) Lochinjektionsschicht/Lochtransportschicht/organische Lichtemissionsschicht/Elektroneninjektionsschicht
• (6) Lochinjektionsschicht/Lochtransportschicht/organische Lichtemissionsschicht/Elektronentransportschicht/Elektroneninjektionsschicht

The above-mentioned organic EL layer 14 emits light from the near ultraviolet to the visible region, preferably light in the blue or blue-green region. The emitted light is incident on the color conversion filter layers and is subjected to the wavelength distribution conversion to visible light having the desired colors. The organic EL layer 14 has a structure having at least one organic light emitting layer, and if necessary, a hole injection layer, a hole transport layer, an electron transport layer, and / or an electron injection layer are interposed. Specifically, an organic EL layer 14 used with a layered structure as follows:

• (1) organic light-emitting layer
• (2) Hole Injection Layer / Organic Light Emission Layer
• (3) organic light emission layer / electron injection layer
• (4) Hole Injection Layer / Organic Light Emission Layer / Electron Injection Layer
• (5) Hole Injection Layer / Hole Transport Layer / Organic Light Emission Layer / Electron Injection Layer
• (6) Hole Injection Layer / Hole Transport Layer / Organic Light Emission Layer / Electron Transport Layer / Electron Injection Layer

(In the above are the anode or anodes with the organic light emission layer or the hole injection layer and the cathode or cathodes are with the organic light emission layer or the electron injection layer connected).

Known Materials are used as materials of the mentioned layers. To obtain luminescence of blue to blue-green color, is in the organic light emission layer, preferably a fluorescent White Medium of the benzothiazole, benzimidazole, benzoxazole or the like type, a metal chelate-oxonium compound, a compound of the styrylbenzene type or aromatic dimethylidene or the like. Further For example, as a hole injection layer, a phthalocyanine compound such as Copper phthalocyanine, a triphenylamine derivative such as m-MTDATA, and as a hole transport layer, a biphenylamine derivative, such as TPD or α-NPD or the like can be used. Further, as an electron transport layer an oxadiazole derivative such as PBD, a triazole derivative, a triazine derivative or the like, and as an electron injection layer, an aluminum quinolinol complex or the like can be used. Furthermore, as the electron injection layer also an alkali, an alkaline earth metal or an alkali or earth alkali metal-containing alloy or an alkali fluoride or the like can be used.

A color filter with color conversion function according to the third embodiment of the invention has a multilayer structure with a transparent substrate 1 , Color filter layers 2 and a dye layer 3 and is also useful as an intermediate in the process of the first embodiment. In this structure, the dye layer acts 3 as a layer which changes the hue of the light incident from light sources. Specifically, the color conversion dye absorbs in the dye layer 3 Light in a part of the wavelength range of the incident light and emits light in a wavelength range different from the absorption wavelength range, thereby combining the light in wavelength ranges where it is not absorbed by the color conversion dye and the light emitted from the color conversion dye, and thus Light with a different hue than that in the dye layer 3 incoming light from the dye layer 3 exit. Specifically, when a composition is selected in which the dye layer 3 By absorbing light in a part of the wavelength range of the incident light and emitting light of a complementary color to this wavelength range, it can be achieved that the white light is the dye layer 3 leaves. For example, by using cyan light as incident light and converting a portion of the light in the blue wavelength range to red light using the color conversion dye, the emitted light may be white.

As a transparent substrate 1 and color filter layers 2 can as well as a dye layer 3 each such as used in the first embodiment.

In the case of the dye layer in the present embodiment 3 egress light should be white light, the type of color conversion dye used, its absorption spectrum, the emission spectrum of the light converted there and its content and the thickness of the dye layer 3 appropriately selected, taking into account the wavelength distribution of the light emitted from the light source used. As the color conversion dye, a red conversion dye as described in the first embodiment is preferably used. Depending on the wavelength distribution of the light emitted by the light sources, it is also possible in the color material layer 3 to introduce a green conversion dye, whereby the blue component of the light of the light source can be reduced and, at the same time, green light emitted from the green conversion dye can be further converted by the red conversion dye so as to increase the conversion efficiency to red light and thus the red component in the emitted light; whereby white light having a desired wavelength distribution can be obtained. Green conversion dyes that can be used are described in the first embodiment.

In the case that of the dye layer 3 emitted light is to be white light, the contents of the color conversion dye (s) in the dye layer 3 and their thickness are adjusted so that the amount of reduction of the blue component in the light of the light source and the amount of increase of the red component in the emitted light are adjusted, whereby the intensities of the blue, green and red components can be equalized and thus white light can be obtained. In comparison of the dye layer 3 with that in the first embodiment, in the present embodiment, it generally has a smaller thickness or a lower content of color conversion dye, or both.

In addition, the dye layer according to the invention is 3 so formed that they have the bar underlying color filter layers 2 of the plurality of types, and also serves as a protective layer forming the color filter layers 2 protects against the effects of the environment (moisture, oxygen, etc.). Besides, one is Patterning of the dye layer is not required, and therefore, the color conversion function color filter of the present embodiment is advantageous in that the manufacturing process is simplified, and also advantageous for the same reason as in the first embodiment, by allowing high level of detail accuracy.

In the color filter with color conversion function of the invention, a gas barrier layer for covering the dye layer 3 be provided. Materials, structures and manufacturing methods that can be used for the gas barrier layer are as described in the first embodiment.

The color conversion function color filter of the present embodiment is particularly useful when combined with light sources that can be independently controlled and arranged in a very detailed matrix form. The light sources are on the side of the dye layer 3 arranged. For example, the color filter having color conversion function can be combined with shutter-owning light bulbs, EL light emitters, plasma light emitters, light emitting diodes (LEDs), or the like, and is preferably combined with EL light emitters, with organic EL light emitters being particularly preferred , In the case of using the dye layer 3 white light, it is preferable to use light sources emitting blue to blue-green light. As in the case of the color conversion filter formed by the method of the first embodiment, it is possible to bond the color filter with color conversion function of the present embodiment and organic EL light emitters formed on a separate substrate so as to form an organic EL device. To make display device of the head emission type.

Further, the color conversion function color filter of the present embodiment has particular advantages as a color filter for displays in which pixels are in a matrix form using color filter layers 2 a plurality of types (2 to 6 types, preferably 3 types, especially the three types of blue, green and red) on a transparent substrate 1 are provided (each pixel consists of a plurality of subpixels corresponding to the respective colors). In this way, in light emitted from the independently controllable light sources at positions corresponding to the subpixels provided in a matrix form, the color tone is transmitted through the dye layer 3 changed to produce white light that enters the color filter layers 2 the subpixel enters. Therefore, unlike the case where color conversion layers corresponding to the colors of the respective subpixels are provided, identical light enters each of the color filter layers of the different colors, and therefore, the necessity of the color conversion efficiency for the color conversion layers of each of the colors in driving is eliminated Consider the light sources, so that the driver circuits for the light sources can be simplified and thus the cost can be reduced. Also, since each of the light sources arranged in the matrix form can be driven under identical conditions, the problem that only light sources corresponding to a certain color are deteriorated upon prolonged driving can be solved, whereby the color tone of the display can be maintained for a longer time ,

example 1

A blue filter material (Color Mosaic CB-7000, manufactured by Fujifilm Arch Co., Ltd.) was coated on a transparent glass substrate using a spin coating method 1 and patterning was performed using a photolithographic process to form blue color filter layers 2 B with a thickness of 2 μm in a pattern of lines extending in a longitudinal direction with a line width of 0.1 mm and a line spacing of 0.33 mm.

A green filter material (Color Mosaic CG-7001, manufactured by Fujifilm Arch Co., Ltd.) was coated onto the transparent glass substrate using a spin coating method 1 applied, on which the blue filter layers 2 B were already formed, and then patterning was performed using a photolithographic process to form green-color filter layers 2G with a thickness of 2 μm in a pattern of lines in the longitudinal direction with a line width of 0.1 mm and a line spacing of 0.33 mm.

Then, a red filter material (Color Mosaic CR-7001, manufactured by Fujifilm Arch Co., Ltd.) was applied using a spin coating method, and then patterning was performed using a photolithographic process to form red color filter layers 2R with a thickness of 2 microns in a pattern of lines running in the longitudinal direction with a line width of 0.1 mm and a line spacing of 0.33 mm.

Then, a solution of a fluorescent color conversion dye was prepared by dissolving coumarin 6 (0.1 part by weight), rhodamine 6G (0.3 part by weight) and basic violet 11 (0.3 part by weight) in a propylene glycol monoethyl acetate solvent (120 parts by weight). To the solution, 100 parts by weight of a photopolymerizable resin "V259PA / P5" (trade name, manufactured by Nippon Steel Chemical Co., Ltd.) was added and dissolved to obtain a coating liquid. The coating liquid was applied by a spin coating method, and drying was performed by heating to form a dye layer 3 to form with a thickness of 7 microns. Here, coumarin 6 is a green conversion dye and rhodamine 6G and basic violet 11 are red conversion dyes.

Then, the light of a carbon arc lamp was exposed as a white light source on the side of the transparent substrate 1 was arranged. The light intensity at the surface of the transparent substrate 1 was 1 W / cm ³ . There were samples with a glass substrate 1 with the color filter layers deposited separately thereon 2 and dye layer 3 and the photodegradation behavior of the color conversion dyes in the samples was examined. The time to drop the absorption of the dyes to 1/10 of the original value was then taken as the exposure time in the present example. As a result of the exposure, red color conversion layers became 4R containing the rhodamine 6G and the basic violet 11 contained on the red color filter layers 2R and green conversion layers 4G containing coumarin 6 on the green filter layers 2G educated. All dyes of the dye layer 3 were in areas above the blue filter layers 2 B and decomposed in areas where no color filter layer was present.

In the obtained color conversion filter, the color conversion layers became 4R and 4G at the locations of the corresponding color filter layers 2R and 2G was formed and no defective molding or the like of the color conversion layers was observed.

Example 2

A black mask material (Color Mosaic CK-7000, manufactured by Fujifilm Arch Co., Ltd.) was coated on a transparent substrate using a spin coating method 1 and then patterning using a photolithographic process so as to form a black mask 6 with a thickness of 1.5 microns and a plurality of openings each of 0.33 mm (in the longitudinal direction) × 0.09 mm in the transverse direction). The distance between the openings was set to 0.03 mm in the longitudinal and transverse directions.

Then, a blue filter material (Color Mosaic CB-7001, manufactured by Fujifilm Arch Co., Ltd.) was applied by using a spin coating method, and patterning was performed using a photolithographic process to form blue filter layers 2 B 2 to form thickness in a pattern of lines in the longitudinal direction with a line width of 0.1 mm and a line spacing of 0.33 mm.

A green filter material (Color Mosaic CG-7001, manufactured by Fujifilm Arch, Co., Ltd.) was coated onto the transparent substrate using a spin coating method 1 applied, on which the blue filter layers 2 B and patterning was then carried out using a photolithographic process to form green filter layers 2G 2 to form thickness in a pattern of lines in the longitudinal direction with a line width of 0.1 mm and a line spacing of 0.33 mm.

Then, a red filter material (Color Mosaic CR-7001, manufactured by Fujifilm Arch Co., Ltd.) was applied using a spin coating method, and patterning was performed using a photolithographic process to form red filter layers 2R with a thickness of 2 μm in a pattern of lines in the longitudinal direction with a line width of 0.1 mm and a line spacing of 0.33 mm.

Next, a solution of fluorescent color conversion dye was prepared by dissolving coumarin 6 (0.1 part by weight), rhodamine 6G (0.3 part by weight) and basic violet 11 (0.3 part by weight) in a propylene glycol monoethyl acetate solvent (120 parts by weight). One hundred parts by weight of a photopolymerizable resin "V259PA / P5" (trade name, manufactured by Nippon Steel Chemical Co., Ltd.) was added to the solution and dissolved to thereby obtain a coating liquid. The coating liquid was applied by a spin coating method, and drying was performed by heating to form a dye layer 3 to form with a thickness of 7 microns. Here, coumarin 6 is a green conversion dye, and rhodamine 6G and basic violet 11 are red conversion dyes.

Then, the light of a carbon arc lamp was exposed as a white light source on the side of the transparent substrate 1 was arranged. The light intensity at the surface of the transparent substrate 1 was 1 W / cm ² . There were samples with a glass substrate 1 and the color filter layers formed thereon 2 and dye layers 3 prepared separately and the photodegradation behavior of the color conversion dyes in the samples was examined. The time to decrease the absorption strength of the dyes to 1/10 of the original value was used as the exposure time in this example. As a result of the exposure, red conversion layers became 4R containing the rhodamine 6G and the basic violet 11 on the red filter layers 2R and green conversion layers 4G containing coumarin 6 on the green filter layers 2G educated. All dyes were decomposed in layers 4B over the blue filter layers 2 B ,

in the obtained color conversion filters were pixels with dimensions of 0.36 mm × 0.36 mm including the black mask is arranged in a matrix, with each pixel red, green and blue subpixels each with dimensions of 0.33 mm (longitudinal direction) and × 0.09 mm (transverse direction) existed.

Al having a thickness of 500 nm and IZO having a thickness of 100 nm were formed by sputtering using a mask on a glass substrate 10 formed on which previously TFTs 11 and an insulating surface compensation film 12 with an opening at a source electrode portion for each of the TFTs, thus forming a first electrode 13 which has been divided into a plurality of parts one-to-one the TFTs 11 correspond. The parts of the first electrode 13 each had dimensions of 0.33 mm (longitudinal) × 0.09 mm (transverse) and were arranged in a matrix with a pitch of 0.03 mm in both the longitudinal and transverse directions.

Then was the substrate on which the first electrode 13 formed in a vapor deposition apparatus with resistance heating and an organic EL layer 14 was educated. The organic EL layer 14 had a four-layer structure having a hole injection layer, a hole transport layer, an organic light emission layer, and an electron injection layer. Especially for the formation of the organic EL layer 14 the pressure in the vacuum chamber was reduced to 1 × 10 ⁴ Pa and, without vacuum release, copper phthalocyanine (CuPc) was used as hole injection layer to a thickness of 100 nm, as hole transport layer 4,4'-bis [N- (1-naphthyl) - N-phenylamino] biphenyl [α-NPD) to a thickness of 2 nm, as an organic light emission layer 4,4'-bis (2,2'-diphenylvinyl) biphenyl (DPVBi) to a thickness of 30 nm and as an electron injection layer of aluminum tris (8-quinolinolate) (Alq) to a thickness of 20 nm, thus forming the organic EL layer 14 to build. Without releasing the vacuum, Mg / Ag (mass ratio 10: 1) was deposited to a thickness of 10 nm and IZO to a thickness of 10 nm to form a second electrode 15 to build.

Finally, a passivation layer of SiO _{2 was formed} to a thickness of 500 nm to remove the structure from the second electrode 15 cover down so as to obtain an organic EL light emitter.

Subsequently, the color conversion filter was placed in a glove box where the moisture concentration and oxygen concentration were both set to 1 ppm. An ultraviolet curing type adhesive (trade name 30Y-437, manufactured by Three Bond) in which grains of 20 μm in diameter were dispersed was then used as an outer peripheral sealing layer 21 applied to the outer peripheral portions of the transparent substrate of the color conversion filter using a coating robot. The color conversion filter and the organic EL light emitter were then glued together under alignment to form an array. Then, ultraviolet light was irradiated for 30 seconds using a UV lamp with 100 mW / cm ^{2 of} the outside peripheral sealing layer 21 to harden and to obtain an EL display.

Example 3

This example explains the effects of the dye layer used in the third embodiment of the invention 3 ,

0.05 g coumarin 6 and 0.04 g rhodamine B became 25 g of a photoresist V259PAP5 (manufactured by Nippon Steel Chemical Co., Ltd.) to such a coating liquid to obtain. The coating liquid was on the surface a transparent substrate (a 1737 glass substrate, manufacturer Corning) applied so as to obtain a dye layer of 2 microns thickness.

Then, using a sputtering method, a gas barrier layer of SiO ₂ film was co-extruded 0.5 μm in thickness to cover the dye layer to obtain a dye-layer substrate. An RF planar magnetron apparatus was used as a sputtering apparatus, SiO ₂ was used as the target and Ar as the sputtering gas. The substrate temperature during SiO ₂ film formation was set at 80 ° C.

A Anode (a multilayer body Al with a thickness of 500 nm and ITO of 100 nm thickness), one organic EL layer and a cathode (a multi-layered body of Mg / Ag (Mass ratio 10: 1) of 10 nm thickness and ITO of 10 nm thickness) were on a separated substrate to form an organic EL device to obtain. The organic EL layer has a multilayer structure made of CuPc of 100 nm thickness, α-NPD of 20 nm thickness, DPVBi of 30 nm thickness and Alq of 20 nm thickness in this order, seen from the anode. The obtained organic EL device emitted cyan Light in the CIE XYZ coordinate system.

The Dye layer substrate and the obtained organic EL device as described above were arranged so that the gas barrier layer and the transparent anode facing each other and the organic EL device was stimulated to emit light. The light had gone the passage through the dye layer color values (x, y) = (0.30, 0.33) and had a broad wavelength distribution in the visible Area.

Example 4

Color filter layers and a black mask were placed on a transparent substrate (a 1737 glass substrate, manufacturer Corning) by a photolithographic Method made using a black mask material (Color Mosaic CK-7000, manufacturer Fujifilm Arch Co., Ltd.), one Blue filter material (Color Mosaic CB-7001, manufacturer Fujifilm Arch Co., Ltd.), a green filter material and a red filter material (each Color Mosaic CR-7001, manufacturer Fujifilm Arch Co., Ltd.).

Here For example, the dimensions of each of the subpixels were set to 300 μm × 100 μm, the distance between adjacent subpixels (i.e., the area where the black Mask was formed) to 30 microns in the longitudinal direction and 10 μm set in the transverse direction and the subpixels were arranged so that each Group of blue, green and red subpixels made a pixel. Beyond that, the total number was the pixels are set to 2500, with 50 pixels in the longitudinal direction and 50 pixels in the transverse direction. The thickness of the Color filter was at 1 micron for the blue and red filters and 2 μm for the green Filter set.

Then 0.05 g of coumarin 6 and 0.04 g of rhodamine B were added to 25 g of a photoresist V259PAP5 (manufacturer Nippon Steel Chemical Co., Ltd.) added, a coating liquid to obtain. The coating liquid was on the surface the color filter layers and the black mask applied to a Dye layer of 2 μm To get thickness.

Then, using a sputtering method, a gas barrier layer of SiO ₂ film of 0.5 μm in thickness was formed so as to cover the dye layer so as to obtain a color filter having color conversion function. An RF planar magnetron apparatus was used as the sputtering apparatus and SiO ₂ as the target and Ar as the sputtering gas. The substrate temperature during SiO ₂ film formation was set at 80 ° C.

Under Using a sputtering method and a photolithographic Method were first electrodes (reflective anodes) with Al of 500 nm thickness and ITO of 100 nm thickness on a separate glass substrate educated. The first electrodes had a stripe pattern in the longitudinal direction with the width of each strip of 105 μm and a sequence of 110 μm (i.e. at a distance of 5 μm between adjacent stripes).

Then, the substrate on which the first electrodes were formed was placed in a resistance heating type vapor deposition apparatus, and at a pressure in the vacuum chamber of 10 ^-4 Pa, CuPc having a thickness of 100 nm was used as a hole injection layer, α-NPD having a thickness of 20 nm as a hole transporting layer, 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, so as to form an organic EL layer.

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

Finally, a passivation layer of SiO ₂ having a thickness of 500 nm was formed so as to cover the structure downwardly from the second electrodes so as to obtain an organic EL light emitter.

Then, the color conversion function color filter and the organic EL light emitter were placed in a glove box where the concentration of moisture and oxygen were both controlled to 1 ppm. A UV curable adhesive (trade name 30Y-437, manufacturer Three Bond) having grains of 20 μm in diameter dispersed therein was then applied as an outer peripheral sealing layer to the outer peripheral portions of the transparent substrate of the color filter having color conversion function by using a dispenser robot. The color filter with color conversion function and the organic EL light emitter were then bonded together with simultaneous alignment so as to form an array. Then, ultraviolet radiation of 100 mW / cm ^{2 was} irradiated for 30 seconds to cure the outer peripheral sealing layer to obtain an organic EL display.

The light emission characteristics of the organic EL display prepared as described above were measured. Specifically, in the case of lighting all the pixels (W) and the color values and the brightness ratio (the relative value taking the case of lighting all the pixels as 100), the color values in the case of lighting only each of the colors (R, G, B ) corresponding subpixels. The results are shown in Table 1. Table 1 Table 1: Brightness ratio and color values for organic EL display using color filter with color conversion function brightness ratio CIE x CIE-y W 100 0.32 0.30 R 26 0.62 0.36 G 36 0.25 0.63 B 38 0.12 0.23

figure description

1 schematic drawings showing a method for producing a color conversion filter according to a first embodiment of the invention.

2 schematic drawings showing a process for producing a color conversion filter according to a second embodiment of the invention.

3 schematic drawings showing a modification of the method for producing a color conversion filter according to the second embodiment of the invention.

4 Fig. 12 is a schematic cross-sectional view showing an example of a color light-emitting conversion device formed by using a color conversion filter manufactured by the method of the invention.

1

transparent substratum

2 (R, G, B)

Color filter layers (Red Green, Blue)

3

dye layer

4 (R, G, B)

Color conversion layers (Red Green, Blue)

5

Equalizing (leveling) layer

6

black mask

10

substratum

11

TFT

12

Equalizing (leveling) film

13

First electrode

14

organic EL layer

15

Second electrode

16

passivation

21

Outer circumferential sealing layer

22

filler

Claims (20)

Method for producing a color conversion filter, characterized by the following steps: forming color filter layers ( 2 ) on a transparent substrate ( 1 ); Forming a dye layer ( 3 ) containing a color conversion dye (CCM) on the color filter layers ( 2 ) and on the transparent substrate ( 1 ); and exposing the dye layer ( 3 ) through the transparent substrate ( 1 ) and the color filter layers ( 2 ) using dye-decomposing light, whereby color conversion layers ( 4 ) are formed at positions adjacent to the color filter layers ( 2 ) correspond; wherein the color conversion dye (CCM) is caused by light outside one of the color filter layers ( 2 ) is decomposed, wherein the dye-decomposing light contains a wavelength range which decomposes the color conversion dye (CCM) and wherein the color conversion layers ( 4 ) emit light by wavelength distribution conversion that passes through the color filter layers ( 2 ) is allowed through. Process for the preparation of a color conversion filter according to claim 1, characterized in that the dye-decomposing Light white Light is. Process for producing a color conversion filter, characterized by the following steps: forming n different color filter layers ( 2R . 2G . 2 B ) on a transparent substrate ( 1 ), where 2 ≤ n ≤ 6; Forming a dye layer ( 3 ) on the n different color filter layers ( 2R . 2G . 2 B ) and on the transparent substrate ( 1 ), wherein the dye layer ( 3 ) contains m different color conversion dyes (R1, Y1), where 1 ≤ m ≤ n - 1; and exposing the dye layer ( 3 ) through the transparent substrate ( 1 ) and by the n different color filter layers ( 2R . 2G . 2 B using dye-decomposing light, where m + 1 color conversion layers ( 4R . 4G . 4B ), the mth color conversion layers ( 4R respectively. 4G ) at positions corresponding to the mth color filter layers ( 2R respectively. 2G ), and wherein the (m + 1) th color conversion layers ( 4B ) at the positions corresponding to the (m + 1) th color filter layers ( 2 B ), each of the n different color filter layers ( 2R . 2G . 2 B ) Passes light in a different wavelength range; wherein the mth color conversion dye (R1 or Y1) is decomposed by light of a shorter wavelength; than that of the mth color filter layers ( 2R respectively. 2G ) transmitted light; and wherein the mth color conversion layers ( 4R respectively. 4G ) emit light by wavelength distribution conversion, which passes through the mth color filter layers ( 2R . 2G ) is allowed through. Method for the production of a color conversion filter according to claim 3, characterized in that the (m + 1) th color filter layers ( 2 B ) Light of a shorter wavelength than the mth color filter layers ( 2R respectively. 2G ). Process for the preparation of a color conversion filter according to claim 3 or 4, characterized in that the dye-decomposing Light wavelength components contains together all of the m different color conversion dyes (R1, Y1) decompose. Process for the preparation of a color conversion filter according to claim 5, characterized in that the dye-decomposing Light white Light is. A method of manufacturing a color conversion filter according to claim 3 or 4, characterized in that the exposure is performed several times and a wavelength component which decomposes the mth color conversion dye (R1 or Y1) is included in at least one of the plurality of exposures the dye-decomposing light is contained. Process for the preparation of a color conversion filter according to claim 6, characterized in that the exposure n - 1 time carried out and the mth exposure is performed using light, that the wavelength component contains which decomposes the mth color conversion dye. Method for producing a color conversion filter according to claim 3, characterized in that the dye layer ( 3 ) also contains an (m + 1) th color conversion dye (B1), (m + 1) th color conversion layers ( 4B ) by the exposure in positions corresponding to the (m + 1) -th color filter layers ( 2 B ), wherein the (m + 1) -th color conversion dye (B1) is decomposed by light emitted by the (m + 1) -th color filter layers ( 2 B ) is not transmitted and the (m + 1) th color conversion dye emits light by wavelength distribution conversion, which is emitted through the (m + 1) th color filter layers ( 2 B ) is allowed through. Method for producing a color conversion filter according to claim 9, characterized in that the (m + 1) th color filter layers ( 2 B ) Transmit light of a shorter wavelength than the mth color filter layers ( 2R respectively. 2G ), wherein the mth color conversion dye (R1 or Y1) is decomposed by light of a shorter wavelength than that of the mth color filter layers ( 2R respectively. 2G ) transmitted light and (m + 1) -th color conversion dye (B1) is decomposed by light of a shorter wavelength than that of the (m + 1) -th color filter layers ( 2 B ) transmitted light. Process for the preparation of a color conversion filter according to claim 10, characterized in that the dye-decomposing Light wavelength components contains together all of the m different color conversion dyes (R1, Y1) decompose. Process for the preparation of a color conversion filter according to claim 11, characterized in that the dye-decomposing Light white Is light containing a component of near ultraviolet. Process for the preparation of a color conversion filter according to claim 9 or 10, characterized in that the exposure performed several times and a wavelength component, which decomposes the kth color conversion dye in the dye decomposer Light is included in at least one of the plurality of exposures is used, where 1≤k≤n. Process for the preparation of a color conversion filter according to claim 13, characterized in that the exposure n-fold carried out and the kth exposure is performed using light, which is the wavelength component contains which decomposes the k th color conversion dye. Color filter made with color conversion function according to a method according to claims 1 to 14. Color filter with color conversion function according to claim 15, characterized in that the dye layer ( 3 ) also as a protective layer for the color filter layers ( 2 ) acts. Color filter with color conversion function according to claim 15, characterized in that the dye layer ( 3 ) incident light is blue to blue-green light and that the at least one color conversion dye (CCM) emits red light. Color filter with color conversion function according to claim 15, characterized in that the dye layer ( 3 ) emerging light is white light. Color filter with color conversion function according to claim 15, characterized in that in the dye layer ( 3 ) the at least one color conversion dye (CCM) is dispersed in a synthetic resin. Color filter with color conversion function according to claim 15, characterized in that it further comprises a dye layer ( 3 ) has opaque gas barrier layer.