JP5610255B2 - Color filter and organic EL display device including the color filter - Google Patents

Description

  The present invention relates to a color filter, and more particularly to a color filter that exhibits high sealing performance when incorporated in a display device. The present invention also relates to an organic EL display device provided with the color filter.

  Conventionally, in the field of flat displays and the like, organic EL display devices including an organic EL layer constituted by sandwiching an organic light emitting layer between an anode and a cathode have been proposed, and application research has been actively conducted. Yes. However, the organic light emitting layer is easily affected by moisture and oxygen present in the surroundings. Therefore, when moisture and oxygen enter the organic EL display device, there is a problem that the light emitting performance of the organic EL display device deteriorates.

  In order to solve such a problem, various methods for sealing the organic EL display device have been proposed. For example, Patent Document 1 proposes a method of sealing between a substrate glass and a cover glass with a low melting point glass frit that is softened by heat. Patent Document 2 proposes a method in which a curable resin is filled between a substrate glass and a cover glass, thereby sealing between the substrate glass and the cover glass.

Special table 2008-517446 gazette JP-A-2005-302401

  When sealing between the substrate glass and the cover glass by the method described in Patent Document 1, only the low melting point glass frit is selectively irradiated with a laser, thereby heating the low melting point glass frit. At this time, in order to soften the low melting point glass frit, the low melting point glass frit is generally heated to a temperature of 100 ° C. or more. For this reason, it is considered that the time required for heating becomes longer. Further, when the low melting point glass frit is heated, the organic EL layer is also heated, which may deteriorate the characteristics of the organic EL layer.

  When the gap between the substrate glass and the cover glass is sealed by the method described in Patent Document 2, a curable resin having a thickness corresponding to the distance between the substrate glass and the cover glass, for example, a thickness of several tens of μm, contacts the outside air. . In this case, it is considered that moisture and oxygen in the outside air permeate the curable resin and enter the organic EL display device, thereby deteriorating the light emitting performance of the organic EL layer.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a color filter that exhibits high sealing performance when incorporated in a display device. Another object of the present invention is to provide an organic EL display device provided with the color filter.

  The color filter according to the present invention includes a color filter base material and a color filter layer laminated on the color filter base material, and the color filter base material has a top plate on one side and the other side. In addition to having a peripheral frame body, a cavity is formed by the top plate and the peripheral frame body, and the color filter layer is laminated on the cavity inner surface of the top plate.

  The color filter by this invention WHEREIN: You may form the groove | channel extended in the peripheral frame body perimeter in the surface which faces the other side among the peripheral frame bodies of the said base material for color filters.

  In the color filter according to the present invention, the width of the groove is preferably 1 μm or more, and the depth of the groove is preferably 1 μm or more and 30 μm or less.

  In the color filter according to the present invention, a frame black matrix layer may be formed over the entire periphery of the peripheral frame on the surface facing the other side of the peripheral frame of the color filter substrate.

  In the color filter according to the present invention, the frame black matrix layer may be formed of a metal film or a light shielding resin.

  An organic EL display device according to the present invention is disposed on the other side of the color filter described above, a glass substrate that supports the color filter, and a glass substrate, and is disposed in the cavity. An organic EL layer having an anode, a cathode, and an organic light emitting layer provided between the anode and the cathode, between the peripheral frame of the color filter base material and the glass substrate, on the glass substrate An adhesive for fixing the color filter is interposed.

  According to the present invention, the color filter includes a color filter base material and a color filter layer laminated on the color filter base material, the color filter base material has a top plate on one side, and While having a peripheral frame on the other side, a cavity is formed inside by these top plate and peripheral frame, and the color filter layer is laminated on the inner surface of the cavity of the top plate. For this reason, when a display device, for example, an organic EL display device is configured using the color filter according to the present invention, the organic EL layer can be accommodated in the cavity. Thus, the peripheral frame of the color filter can prevent moisture and oxygen from entering the organic EL display device from the side of the organic EL display device.

  According to the invention, an organic EL display device is provided on the other side of the color filter described above, a glass substrate supporting the color filter, the glass substrate, the cavity, and the cavity. An organic EL layer having an anode, a cathode, and an organic light emitting layer provided between the anode and the cathode, between the peripheral frame body of the color filter substrate and the glass substrate, An adhesive for fixing the color filter is interposed on the glass substrate. Thus, the peripheral frame of the color filter can prevent moisture and oxygen from entering the organic EL display device from the side of the organic EL display device.

FIG. 1A is a longitudinal sectional view showing a color filter according to the first embodiment of the present invention, and FIG. 1B is a plan view showing the color filter according to the first embodiment of the present invention. FIG. 2 is an enlarged longitudinal sectional view showing a color filter layer of the color filter shown in FIG. FIG. 3 is a longitudinal sectional view showing the organic EL display device according to the first embodiment of the present invention. FIGS. 4A, 4B, 4C, and 4D are diagrams showing steps of manufacturing an organic EL display device in the first embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing an organic EL display device as a first comparative example. FIG. 6 is a longitudinal sectional view showing an organic EL display device as a second comparative example. FIG. 7 is a longitudinal sectional view showing a color filter according to a second embodiment of the present invention. FIG. 8 is a longitudinal sectional view showing an organic EL display device according to a second embodiment of the present invention. FIG. 9A is a longitudinal sectional view showing the organic EL display device according to the second embodiment of the present invention, and FIG. 9B shows the organic EL display device according to the second embodiment of the present invention. Plan view. 10 (a), (b), (c), (d), and (e) are diagrams showing steps of manufacturing a color filter in the second embodiment of the present invention. FIGS. 11A, 11B, 11C, and 11D are views showing a modification of the second embodiment of the present invention. FIG. 12A is a longitudinal sectional view showing an organic EL display device according to the third embodiment of the present invention, and FIG. 12B shows an organic EL display device according to the third embodiment of the present invention. Plan view. FIGS. 13A, 13B, 13C, 13D, and 13E are views showing steps of manufacturing a color filter in the third embodiment of the present invention. FIG. 14 is a longitudinal sectional view showing a color filter according to a fourth embodiment of the present invention. FIG. 15 is a longitudinal sectional view showing an organic EL display device according to a fourth embodiment of the present invention. FIG. 16 is a longitudinal sectional view showing a color filter in a modification of the fourth embodiment of the present invention. FIG. 17 is a longitudinal sectional view showing an organic EL display device according to a modification of the fourth embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, the entire organic EL display device 40 in the present embodiment will be described with reference to FIG.

Organic EL Display Device As shown in FIG. 3, the organic EL display device 40 is provided on the glass substrate 47, a color filter 10 in which a cavity 21 described later is formed, a glass substrate 47 that supports the color filter 10, and the glass substrate 47. And an organic EL layer 44 that is disposed in the cavity 21 and includes an anode 41, a cathode 43, and an organic light emitting layer 42 provided between the anode 41 and the cathode 43. The organic EL display device 40 in this embodiment is a so-called top emission type, and light emitted from the organic EL layer 14 is extracted in the direction of the arrow shown in FIG.

  In addition, an adhesive 30 is interposed between a peripheral frame 22 (described later) of the color filter 10 and the glass substrate 47, whereby the color filter 10 and the glass substrate 47 are bonded.

  The glass substrate 47 in the present embodiment is not particularly limited as long as it supports the organic EL layer 44 and can block the outside air, but has good stability, durability, and the like. Therefore, glass or a transparent polymer is preferable.

  The anode 41 is not particularly limited as long as it is a material that can inject holes efficiently. For example, aluminum, chromium, molybdenum, tungsten, copper, silver, gold, and alloys thereof may be used. preferable.

  On the other hand, the cathode 43 is made of a material that is easy to inject electrons and has a good light transmission property, such as lithium oxide or cesium carbonate.

  The organic light emitting layer 42 is not particularly limited as long as it contains a fluorescent organic substance that emits light when a predetermined voltage is applied. For example, a quinolinol complex, an oxazole complex, various laser dyes, Paraphenylene vinylene etc. are mentioned.

  Note that a hole transport layer (not shown) may be provided between the anode 41 and the organic light emitting layer 42 in order to efficiently transport holes injected from the anode 41 to the organic light emitting layer 12. An example of the constituent material of the hole transport layer is tetraphenylbenzidine. Further, a hole injection layer (not shown) may be provided between the anode 41 and the hole transport layer. Further, an electron injection layer (not shown) or an electron transport layer (not shown) may be provided between the organic light emitting layer 42 and the cathode 43.

  As shown in FIG. 3, the organic EL layer 44 provided on the glass substrate 47 is covered with a barrier film 45 that shields moisture. The barrier film 45 is formed by laminating a plurality of layers, for example, 20 layers, and examples of the material of each layer of the barrier film 45 include silicon, aluminum, zinc, tin oxide or oxynitride. However, as will be described later, the barrier film 45 covering the organic EL layer 44 is not necessarily provided.

  Further, as shown in FIG. 3, a desiccant 46 that adsorbs water vapor in the organic EL display device 40 is disposed in the cavity 21 so as not to interfere with light emission from the organic EL layer 44. Examples of the material of the desiccant 46 include barium or calcium oxide. However, the desiccant 46 is not necessarily provided.

  The adhesive 30 is not particularly limited as long as it has a function of favorably bonding the peripheral frame body 22 of the color filter 10 and the glass substrate 47. For example, a vinyl chloride resin or a phenol resin is used. , Silicone resin, epoxy resin, polyester resin, urethane resin, acrylic resin, polybutadiene resin, resin having an adhesive function consisting of a combination of two or more of vinyl acetate resin, etc. It is preferable to do.

Color Filter Next, the color filter 10 will be described in detail with reference to FIGS. As shown in FIGS. 1A and 1B, the color filter 10 includes a color filter substrate 20 and a color filter layer 11 laminated on the color filter substrate 20.

Color Filter Base Material Among these, the color filter base material 20 has a top plate 23 on one side and a peripheral frame 22 on the other side, as shown in FIGS. The top plate 23 and the peripheral frame 22 form a cavity 21 inside. In the present embodiment, the depth of the cavity 21 is, for example, 14 μm.

  The material of the color filter substrate 20 is not particularly limited as long as the light emission of the organic EL layer 44 can be taken out and moisture and oxygen can be effectively blocked. However, in consideration of processability when forming the cavity 21, adhesiveness with the adhesive 30, light transmittance, stability, durability, and the like, it is preferable to use glass, polymer, or the like.

Color filter layer Next, the color filter layer 11 will be described in detail. The color filter layer 11 corrects the light from the organic EL layer 44 or increases the color purity. In the present embodiment, the color filter layer 11 is laminated on the cavity inner surface 23a of the top plate 23 as shown in FIG.

  In the present embodiment, as shown in FIG. 2, the color filter layer 11 includes a red colored layer 12a, a blue colored layer 12b, and a green colored layer 12c regularly arranged on the top plate 23 corresponding to the pixels. It has the coloring resin layer 12 which becomes. As shown in FIG. 2, the color filter layer 11 may have a black matrix layer 13 that partitions the colored layers 12a, 12b, and 12c for each unit pixel.

The red colored layer 12a, the blue colored layer 12b, and the green colored layer 12c are layers formed by dispersing or dissolving a colorant such as a pigment or dye of each color in a photosensitive resin. Among these, examples of the colorant used for the red colored layer 12a include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. These pigments may be used alone or in combination of two or more.
Examples of the colorant used for the blue colored layer 12b include copper phthalocyanine pigments, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, dioxazine pigments, and the like. These pigments may be used alone or in combination of two or more.
Examples of the colorant used in the green colored layer 12c include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindolinone. And pigments. These pigments or dyes may be used alone or in combination of two or more.

  Examples of the material of the black matrix layer 13 include a resin composition containing a black colorant such as carbon black and titanium black. As the resin used in this resin composition, for example, a photosensitive resin having a reactive vinyl group such as an acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber can be used.

  As shown in FIG. 2, the color filter layer 11 may be provided with an overcoat layer 14 that protects the colored layers 12 a, 12 b, 12 c and the black matrix layer 13. As shown in FIG. 3, the color filter layer 11 may be provided with a barrier film 15 that shields moisture released from the color filter layer 11 from entering the organic EL layer 44. Similar to the barrier film 45 covering the organic EL layer 44, the barrier film 15 covering the color filter layer 11 is formed by laminating a plurality of layers, for example, 20 layers. The material of each layer of the barrier film 15 is silicon. And oxides or oxynitrides of aluminum, zinc or tin.

  A spacer (not shown) may be provided as appropriate on the black matrix layer 13. In this case, a spacer may be formed by laminating the red colored layer 12a, the blue colored layer 12b, and the green colored layer 12c on the black matrix layer 13, or the spacer may be formed of other appropriate materials. Good.

  In the present embodiment, as described above, the color filter layer 11 is laminated on the cavity inner surface 23 a of the top plate 23. For this reason, compared with the case where the color filter layer 11 is laminated | stacked on the surface 23b of the one side among the top plates 23, the distance from the organic EL layer 44 to the color filter layer 11 can be shortened. Thereby, the light emitted from the region corresponding to the predetermined unit pixel of the organic EL display device 40 in the organic EL layer 44 is a colored layer other than the colored layers 12a, 12b, and 12c corresponding to the predetermined unit pixel. It is possible to reduce the occurrence of so-called sneaking of light that is incident on 12a, 12b, and 12c, thereby improving the efficiency of the organic EL display device 40.

  Next, the operation of the present embodiment having such a configuration will be described. Here, a method for manufacturing the color filter 10 and the organic EL display device 40 will be described.

Method for Manufacturing Color Filter First, a method for manufacturing the color filter 10 will be described with reference to FIGS. 4 (a), 4 (b), and 4 (c). First, as shown in FIG. 4A, a material 26 for forming the color filter substrate 20 is prepared. The material 26 is made of glass having a width of 10 cm × 10 cm.

  Next, the material 26 is mechanically cut, thereby having a top plate 23 on one side and a peripheral frame 22 on the other side, as shown in FIG. The base material 20 for color filters which forms the cavity 21 inside by the peripheral frame 22 is obtained. In this case, the depth of the cavity 21 is 14 μm.

  Thereafter, the color filter layer 11 having the colored resin layer 12 and the black matrix layer 13 is laminated on the cavity inner surface 23a of the top plate 23 by photolithography. As a result, the color filter 10 is obtained as shown in FIG. In addition, when laminating the colored resin layer 12, a spacer formed by laminating the colored layers 12a, 12b, and 12c may be formed. Alternatively, after the colored resin layer 12 is laminated, the spacer may be formed of other appropriate materials. Further, after the colored resin layer 12 and the black matrix layer 13 are laminated, an overcoat layer 14 that protects the colored resin layer 12 and the black matrix layer 13 may be formed.

Manufacturing Method of Organic EL Display Device After manufacturing the color filter 10 as described above, a glass substrate 47 provided with the organic EL layer 44 is prepared. Next, after the adhesive 30 is applied to the surface 22 a facing the other side of the peripheral frame body 22, the glass substrate 47 and the color filter 10 are bonded. In this way, an organic EL display device 40 can be obtained as shown in FIG. In this case, the thickness of the adhesive 30 interposed between the surface 22a of the peripheral frame 22 and the glass substrate 47 is 6 μm, and therefore the cell gap between the top plate 23 and the glass substrate 47 is 20 μm. It has become.

  Before bonding the glass substrate 47 and the color filter 10, the organic EL layer 44 may be covered with a barrier film 45 and the color filter layer 11 may be covered with a barrier film 15 as shown in FIG. . A desiccant 46 may be disposed in the cavity 21.

  As described above, according to the present embodiment, the color filter 10 includes the color filter substrate 20 and the color filter layer 11 laminated on the color filter substrate 20, and the color filter substrate 20 includes: The top plate 23 is provided on one side and the peripheral frame body 22 is provided on the other side, and the cavity 21 is formed in the inside by the top plate 23 and the peripheral frame body 22. Of these, they are stacked on the cavity inner surface 23a. Therefore, when the organic EL display device 40 is configured using the color filter 10, the organic EL layer 44 can be stored in the cavity 21. Thus, the peripheral frame body 22 of the color filter 10 can prevent moisture and oxygen from entering the organic EL display device 40 from the side of the organic EL display device 40.

  In addition, according to the present embodiment, the organic EL display device 40 includes the above-described color filter 10, the glass substrate 47 that is disposed on the other side of the color filter 10 and supports the color filter 10, and the glass substrate 47. And an organic EL layer 44 having an anode 41, a cathode 43, and an organic light emitting layer 42 provided between the anode 41 and the cathode 43. Further, an adhesive 30 that fixes the color filter 10 on the glass substrate 47 is interposed between the peripheral frame 22 of the color filter substrate 20 and the glass substrate 47. Thus, the peripheral frame body 22 of the color filter 10 can prevent moisture and oxygen from entering the organic EL display device 40 from the side of the organic EL display device 40.

  Further, according to the present embodiment, as described above, the peripheral frame body 22 of the color filter 10 prevents moisture and oxygen from entering the organic EL display device 40 from the side of the organic EL display device 40. it can. For this reason, compared with the case where the color filter 10 does not have the peripheral frame 22, the thickness of the barrier film 45 covering the organic EL layer 44 can be reduced, that is, the number of layers forming the barrier film 45 can be reduced. it can. This can suppress the occurrence of light refraction and interface reflection that can occur when light reaches between the layers forming the barrier film 45, thereby improving the efficiency of the organic EL display device 40. Can do. Further, depending on the resistance of the organic EL layer 44 to moisture and oxygen, the barrier film 45 covering the organic EL layer 44 can be eliminated, and thereby the efficiency of the organic EL display device 40 can be further improved. For the same reason, the number of layers for forming the barrier film 15 covering the color filter layer 11 can be reduced, whereby the efficiency of the organic EL display device 40 can be improved.

  Next, the effect of the present invention will be described in comparison with a comparative example. As a first comparative example, FIG. 5 shows an organic EL display device 50 in which the space between the glass substrate 47 and the color filter glass substrate 51 is sealed with a low-melting glass frit 52 that is softened by heat. In this case, first, the low melting glass frit 52 is patterned on the periphery of the glass substrate 47 provided with the organic EL layer 44, and then the color filter glass substrate 51 provided with the color filter layer 11 is replaced with the glass substrate. Affix to 47. Thereafter, the low melting point glass frit 52 is heated to a temperature of 100 ° C. or higher by spot heat. As a result, the low melting point glass frit 52 is softened, and the softened low melting point glass frit 52 is brought into close contact with the glass substrate 47 and the color filter glass substrate 51. Thus, the space between the glass substrate 47 and the color filter glass substrate 51 is sealed. The cell gap at this time is 20 μm.

  In the first comparative example, when the low melting point glass frit 52 is softened, the low melting point glass frit 52 is heated to a temperature of 100 degrees or more. For this reason, it is considered that the time required for heating becomes long and the production efficiency deteriorates. Further, when the low melting point glass frit 52 is heated, the organic EL layer 44 is also heated, which may deteriorate the characteristics of the organic EL layer 44.

  Next, a second comparative example will be described with reference to FIG. FIG. 6 shows an organic EL display device 53 in which a resin adhesive 54 is filled between the glass substrate 47 and the color filter glass substrate 51, thereby sealing the space between the glass substrate 47 and the color filter glass substrate 51. . In this case, first, the resin adhesive 54 is applied on the glass substrate 47 provided with the organic EL layer 44, and then the color filter glass substrate 51 provided with the color filter layer 11 is bonded to the glass substrate 47. The Thus, the space between the glass substrate 47 and the color filter glass substrate 51 is sealed. The cell gap at this time is 20 μm.

  In the second comparative example, the resin adhesive 54 having a thickness corresponding to the cell gap, that is, a thickness of 20 μm is in contact with the outside air. For this reason, it is considered that moisture and oxygen in the outside air permeate the resin adhesive 54 and enter the organic EL display device 53, thereby deteriorating the light emitting performance of the organic EL layer 44.

  On the other hand, according to the present invention, as described above, the color filter 10 includes the color filter substrate 20 and the color filter layer 11 laminated on the color filter substrate 20, and the color filter substrate. The material 20 has a top plate 23 on one side and a peripheral frame 22 on the other side, and a cavity 21 is formed inside by the top plate 23 and the peripheral frame 22, and the color filter layer 11 The top plate 23 is laminated on the cavity inner surface 23a. For this reason, in the organic EL display device 40 including the color filter 10, the organic EL layer 44 can be stored in the cavity 21. Thus, the peripheral frame body 22 of the color filter 10 can prevent moisture and oxygen from entering the organic EL display device 40 from the side of the organic EL display device 40. In this case, since a step of heating to a temperature of 100 ° C. or higher by spot heat is unnecessary, a long time is not taken for heating, and the characteristics of the organic EL layer 44 are not deteriorated by heat. Further, the thickness of the adhesive 30 can be reduced as compared with the case where the color filter 10 does not have the peripheral frame body 22, and therefore, moisture and water that penetrates the adhesive 30 and enters the organic EL display device 53. The amount of oxygen can be reduced.

  In the present embodiment, an example is shown in which the color filter layer 11 includes a colored resin layer 12 including a plurality of red colored layers 12a, blue colored layers 12b, and green colored layers 12c, each provided in a predetermined region. It was. However, the present invention is not limited to this, and the color filter layer 11 can be appropriately designed according to the light emission characteristics of the organic EL layer 44. For example, when a blue light emitting organic light emitting layer is used as the organic light emitting layer 42 of the organic EL layer 44, the color filter layer 11 is a color conversion phosphor layer (not shown) that converts blue light into green fluorescence or red fluorescence. You may have.

  Moreover, in this Embodiment, as shown to Fig.1 (a), the example in which the cavity 21 which has a rectangular vertical cross section was formed in the base material 20 for color filters was shown. However, the present invention is not limited to this, and the cavity 21 having a trapezoidal or inverted trapezoidal longitudinal section may be formed in the color filter substrate 20. Further, the longitudinal section of the cavity 21 formed in the color filter substrate 20 may have a curved surface.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. Here, FIG. 7 is a longitudinal sectional view showing the color filter in the second embodiment of the present invention, and FIG. 8 is a longitudinal sectional view showing the organic EL display device in the second embodiment of the present invention. is there. FIG. 9A is a longitudinal sectional view showing an organic EL display device according to the second embodiment of the present invention, and FIG. 9B is an organic EL display device according to the second embodiment of the present invention. FIG. FIGS. 10 (a), (b), (c), (d), and (e) are diagrams showing steps of manufacturing a color filter in the second embodiment of the present invention, and FIGS. (C) (d) is a figure which shows the modification of the 2nd implementation of this invention.

  The second embodiment shown in FIG. 7 to FIG. 11 is different in that a groove extending around the entire circumference of the peripheral frame body is formed on the surface facing the other side of the peripheral frame body of the color filter substrate. Other configurations are substantially the same as those of the first embodiment shown in FIGS. In the second embodiment shown in FIG. 7 to FIG. 11, the same parts as those in the first embodiment shown in FIG. 1 to FIG.

Color Filter Substrate As shown in FIG. 7, a groove 22 b extending around the entire circumference of the peripheral frame 22 is formed on the surface 22 a facing the other side of the peripheral frame 22 of the color filter base 20. In the present embodiment, as shown in FIG. 8, the adhesive 30 is interposed between the peripheral frame body 22 and the glass substrate 47 and is also stored in the groove 22b.

  Next, the structure of the color filter substrate 20 will be described with reference to FIGS. As described in the first embodiment shown in FIGS. 1 to 6, the color filter substrate 20 has a top plate 23 and a peripheral frame body 22, and the top plate 23 and the peripheral frame body 22 are used for the interior. A cavity 21 is formed on the surface. Further, a groove 22b extending around the entire circumference of the peripheral frame body 22 is formed on a surface 22a facing the other side of the peripheral frame body 22.

  As shown in FIG. 9A, the height of the peripheral frame body 22 is b, the depth of the groove 22b is a, and the thickness of the adhesive 30 is e. In this case, the depth a of the groove 22b is preferably 1 μm or more, more preferably 1 μm or more and 30 μm or less. The height b of the peripheral frame body 22 is preferably not less than the depth a of the groove 22b and not more than 300 μm. The thickness e of the adhesive 30 is preferably 30 μm or less, and more preferably 6 μm or less.

  Further, as shown in FIG. 9A, the width of the peripheral frame body 22 is d, and the width of the groove 22b is c. In this case, the width c of the groove 22b is preferably 1 μm or more.

  By making the base material 20 for color filters into the above-mentioned structure, while increasing the adhesion area between the adhesive 30 in the groove | channel 22b, and the peripheral frame 22 inner surface, predetermined amount adhesive agent 30 is put in the groove | channel 22b. Can be secured. For this reason, compared with the case where the groove | channel 22b is not formed in the peripheral frame body 22 of the base material 20 for color filters, the thickness of the part exposed to the external air side and the cavity 21 side among the adhesive agents 30 is made thin. In addition, a predetermined amount of the adhesive 30 interposed between the color filter substrate 20 and the glass substrate 47 can be secured. Thus, moisture and oxygen that permeate the adhesive 30 and enter the organic EL display device 40 can be reduced while the adhesive 30 has desired adhesiveness and elasticity. In addition, a flexible seal can be formed as compared with the case where the color filter substrate 20 and the glass substrate 47 are sealed with glass frit.

  Next, the operation of the present embodiment having such a configuration will be described. Here, a method for manufacturing the color filter 10 and the organic EL display device 40 will be described.

Method for Manufacturing Color Filter First, a method for manufacturing the color filter substrate 20 of the color filter 10 by sandblasting will be described with reference to FIGS. 10 (a), (b), (c), and (d). First, as shown in FIG. 10A, a material 26 of the color filter substrate 20 is prepared. The material 26 is made of glass having a width of 10 cm × 10 cm.

  Next, as shown in FIG. 10B, the material 26 is provided with a blast resist 31 having resistance to sand blasting. Thereafter, a mask (not shown) on which a pattern corresponding to the cavity 21 and the groove 22b of the color filter substrate 20 is formed is placed on the blast resist 31, and exposure and development are performed. As a result, as shown in FIG. 10C, the blast resist 31 having the opening 31a corresponding to the cavity 21 and the opening 31b corresponding to the groove 22b can be obtained. In the blast resist 31 shown in FIG. 10C, the width of the opening 31a corresponding to the cavity 21 is 2 cm, and the width of the opening 31b corresponding to the groove 22b is 5 μm.

  Next, portions corresponding to the openings 31 a and 31 b of the blast resist 31 in the material 26 are removed by sandblasting. As a result, the cavity 21 and the groove 22b are formed as shown in FIG. Thereafter, the blast resist 31 is removed to obtain the color filter substrate 20 in which the cavities 21 and the grooves 22b are formed. In this case, the obtained cavities 21 and grooves 22b are substantially rectangular. In the color filter substrate 20 shown in FIG. 10D, the depth of the cavity 21 is 50 μm, and the depth of the groove 22b is 5 μm.

  In order to make the depth of the cavity 21 different from the depth of the groove 22b, when the material 26 is scraped by sandblasting, for example, the processing strength or processing time in the portion corresponding to the opening 31a and the portion corresponding to the opening 31b Processing strength or processing time may be varied. Alternatively, the portion corresponding to the opening 31a and the portion corresponding to the opening 31b are processed with the same strength for the same time, and then the portion corresponding to the opening 31b is covered with the blast resist 31, and then the opening 31a. The part corresponding to may be further processed by sandblasting.

  Then, the color filter layer 11 is laminated | stacked by the photolithographic method on the cavity inner surface 23a among the top plates 23 of the base material 20 for color filters. As a result, the color filter 10 is obtained as shown in FIG.

Manufacturing Method of Organic EL Display Device After manufacturing the color filter 10 as described above, a glass substrate 47 provided with the organic EL layer 44 is prepared. Next, after filling the groove 22b of the peripheral frame body 22 with the adhesive 30 and applying the adhesive 30 to the surface 22a facing the other side of the peripheral frame body 22, the glass substrate 47 and the color filter 10 are bonded. Glue. In this way, the organic EL display device 40 shown in FIG. 8 can be obtained. In this case, the thickness of the adhesive 30 interposed between the surface 22a of the peripheral frame 22 and the glass substrate 47 is 3 μm.

  As described above, according to the present embodiment, the adhesive 22 that stores the adhesive 30 that extends to the entire circumference of the peripheral frame 22 is provided on the surface 22 a facing the other side of the peripheral frame 22 of the color filter substrate 20. A groove 22b for 30 is formed. For this reason, the adhesive area between the adhesive 30 in the groove 22b and the inner surface of the peripheral frame 22 can be increased, and a predetermined amount of the adhesive 30 can be secured in the groove 22b. For this reason, compared with the case where the groove 22b is not formed in the peripheral frame body 22 of the color filter base material 20, the adhesive 30 is maintained while maintaining a strong adhesion between the glass substrate 47 and the cap base material 20. The thickness can be reduced. As a result, moisture and oxygen that permeate the adhesive 30 and enter the organic EL display device 40 can be reduced.

  According to the present embodiment, in the peripheral frame body 22 of the color filter substrate 20, the depth a of the groove 22b is preferably 1 μm or more, more preferably 1 μm or more and 30 μm or less, for example, 5 μm. It is. The width of the groove 22b is preferably 1 μm or more, for example, 5 μm. Further, the thickness of the adhesive 30 interposed between the peripheral frame 22 of the color filter substrate 20 and the glass substrate 47 is preferably 30 μm or less, more preferably 6 μm or less, for example, 3 μm. is there. Thus, moisture and oxygen that permeate the adhesive 30 and enter the organic EL display device 40 can be reduced while maintaining strong adhesion between the glass substrate 47 and the color filter substrate 20.

  According to the present embodiment, the material 26 is prepared first, and then the cavity 21 and the groove 22b for the adhesive 30 are formed in the material 26 by sandblasting. Thereby, the color filter base material 20 in which the groove 22b for accommodating the adhesive 30 is formed in the peripheral frame body 22 can be obtained. By using the color filter 10 including the color filter base material 20 in the organic EL display device 40, moisture and oxygen that permeate the adhesive 30 and enter the organic EL display device 40 can be reduced.

  In the present embodiment, an example in which the groove 22b for the adhesive 30 having a substantially rectangular shape is formed on the surface 22a facing the other side of the peripheral frame body 22 of the color filter substrate 20 is shown. However, the present invention is not limited to this, and a groove 22b having a tapered shape that tapers upward may be formed in the peripheral frame 22 as shown in FIG. Or as shown in FIG.11 (c), you may form the groove | channel 22b which has a rounded shape in the upper part.

  Further, in the present embodiment, a groove 22b for the adhesive 30 that extends around the entire circumference of the peripheral frame body 22 and stores the adhesive 30 is formed on the surface 22a facing the other side of the peripheral frame body 22 of the color filter substrate 20. An example in which is formed in a single layer is shown. However, the present invention is not limited to this, and as shown in FIG. 11B or FIG. 11D, an adhesive 30 that extends around the entire periphery of the peripheral frame 22 and stores the adhesive 30 in the peripheral frame 22. The groove 22b for use may be formed twice, or may be formed three or more times.

Third Embodiment Next, with reference to FIGS. 12 and 13, a third embodiment of the present invention will be described. Here, FIG. 12A is a longitudinal sectional view showing an organic EL display device according to the third embodiment of the present invention, and FIG. 12B is an organic EL display according to the third embodiment of the present invention. It is a top view which shows a display apparatus. FIGS. 13A, 13B, 13C, 13D, and 13E are diagrams showing steps of manufacturing a color filter in the third embodiment of the present invention.

  The third embodiment shown in FIG. 12 and FIG. 13 is different only in that a cavity and a groove for an adhesive are formed in a color filter base material by wet etching. 6 is substantially the same as the first embodiment shown in FIG. 6 and the second embodiment shown in FIGS. In the third embodiment shown in FIGS. 12 and 13, the same reference numerals are used for the same parts as those in the first embodiment shown in FIGS. 1 to 6 and the second embodiment shown in FIGS. Detailed description will be omitted.

Color Filter Base Material As shown in FIG. 12A, the color filter base material 20 has a top plate 23 and a peripheral frame body 22, and the cavity 21 is formed inside by the top plate 23 and the peripheral frame body 22. Is formed. In addition, a groove 22 b that accommodates the adhesive 30 is formed on the surface 22 a facing the other side of the peripheral frame 22, extending along the entire periphery of the peripheral frame 22. As shown in FIG. 12A, the cavity 21 and the groove 22b in the present embodiment have a rounded shape at the top.

  As shown in FIG. 12A, the maximum height of the peripheral frame 22 is b, the maximum depth of the groove 22b is a, and the thickness of the adhesive 30 is e. In this case, the maximum depth a of the groove 22b is preferably 1 μm or more, more preferably 1 μm or more and 30 μm or less. The maximum height b of the peripheral frame body 22 is preferably not less than the maximum depth a of the groove 22b and not more than 300 μm. The thickness e of the adhesive 30 is preferably 30 μm or less, and more preferably 6 μm or less.

  Also, as shown in FIG. 12A, the maximum width of the peripheral frame body 22 is d, and the maximum width of the groove 22b is c. In this case, the maximum width c of the groove 22b is preferably 1 μm or more.

  By making the base material 20 for color filters into the above-mentioned structure, while increasing the adhesion area between the adhesive 30 in the groove | channel 22b, and the peripheral frame 22 inner surface, predetermined amount adhesive agent 30 is put in the groove | channel 22b. Can be secured. For this reason, compared with the case where the groove | channel 22b is not formed in the peripheral frame body 22 of the base material 20 for color filters, the thickness of the part exposed to the external air side and the cavity 21 side among the adhesive agents 30 is made thin. In addition, a predetermined amount of the adhesive 30 interposed between the color filter substrate 20 and the glass substrate 47 can be secured. Thus, moisture and oxygen that permeate the adhesive 30 and enter the organic EL display device 40 can be reduced while the adhesive 30 has desired adhesiveness and elasticity.

  Next, the operation of the present embodiment having such a configuration will be described. Here, the manufacturing method of the base material 20 for color filters is demonstrated.

Method for Producing Color Filter First, a method for producing the color filter substrate 20 of the color filter 10 by wet etching with hydrofluoric acid will be described with reference to FIGS. First, as shown in FIG. 13A, a material 26 of the color filter substrate 20 is prepared. The cap base material 26 is made of glass having a width of 10 cm × 10 cm.

  Next, as shown in FIG. 13B, a hydrofluoric acid resistant resist 32 having resistance to hydrofluoric acid is provided on the material 26. Thereafter, a mask (not shown) on which a pattern corresponding to the cavity 21 and the groove 22b of the color filter substrate 20 is formed is placed on the hydrofluoric acid resist 32, and exposure and development are performed. As a result, as shown in FIG. 13C, a hydrofluoric acid resistant resist 32 having an opening 32a corresponding to the cavity 21 and an opening 32b corresponding to the groove 22b can be obtained. In the hydrofluoric acid resistant resist 32 shown in FIG. 13C, the width of the opening 32a corresponding to the cavity 21 is 2 cm, and the width of the opening 32b corresponding to the groove 22b is 5 μm.

  Next, by wet etching with hydrofluoric acid, portions of the material 26 corresponding to the openings 32a and 32b of the hydrofluoric acid resistant resist 32 are dissolved. As a result, the cavity 21 and the groove 22b are formed as shown in FIG. Thereafter, by removing the hydrofluoric acid resist 32, the color filter substrate 20 in which the cavities 21 and the grooves 22b are formed can be obtained. In this case, the obtained cavities 21 and grooves 22b are rounded. In the color filter substrate 20 shown in FIG. 13D, the maximum depth of the cavity 21 is 50 μm, and the maximum depth of the groove 22b is 5 μm.

  In order to make the maximum depth of the cavity 21 different from the maximum depth of the groove 22b, when the material 26 is melted by wet etching, for example, a portion corresponding to the opening 32a and a portion corresponding to the opening 32b are set for a predetermined time. Then, the portion corresponding to the opening 32b may be covered with a hydrofluoric acid resist 32, and then the portion corresponding to the opening 32a may be further processed by wet etching.

  Then, the color filter layer 11 is laminated | stacked by the photolithographic method on the cavity inner surface 23a among the top plates 23 of the base material 20 for color filters. As a result, the color filter 10 is obtained as shown in FIG.

Manufacturing Method of Organic EL Display Device After manufacturing the color filter 10 as described above, a glass substrate 47 provided with the organic EL layer 44 is prepared. Next, after filling the groove 22b of the peripheral frame body 22 with the adhesive 30 and applying the adhesive 30 to the surface 22a facing the other side of the peripheral frame body 22, the glass substrate 47 and the color filter 10 are bonded. Glue. In this way, the organic EL display device 40 can be obtained. In this case, the thickness of the adhesive 30 interposed between the surface 22a of the peripheral frame 22 and the glass substrate 47 is 3 μm.

  Thus, according to the present embodiment, the material 26 is first prepared, and then the cavity 21 and the groove 22b for the adhesive 30 are formed in the material 26 by wet etching. Thereby, the color filter base material 20 in which the groove 22b for accommodating the adhesive 30 is formed in the peripheral frame body 22 can be obtained. By using the color filter 10 including the color filter base material 20 in the organic EL display device 40, moisture and oxygen that permeate the adhesive 30 and enter the organic EL display device 40 can be reduced.

  In the present embodiment, an example is shown in which the cavity 21 and the groove 22b for the adhesive 30 are formed in the material 26 by wet etching. However, the present invention is not limited to this, and the cavity 22 and the groove 22b for the adhesive 30 may be formed in the material 26 by appropriately combining sandblasting and wet etching. Alternatively, the cavity 21 and the groove 22b for the adhesive 30 may be formed in the material 26 by other processing methods.

  Further, in each of the above embodiments, an example is shown in which the cavity 21 is formed in the material 26 by mechanical cutting, sand blasting, wet etching, or other processing methods. That is, in the color filter base material 20, the example in which the top plate 23 and the peripheral frame body 22 are integrally formed is shown. However, the present invention is not limited to this, and the color filter base material 20 may be formed by the separate top plate 23 and peripheral frame 22. For example, the top plate 23 and the peripheral frame body 22 are respectively prepared, and the peripheral frame body 22 is welded to the peripheral edge of the top plate 23 to thereby have the top plate 23 on one side and the peripheral frame body 22 on the other side. In addition, the base plate 20 for color filter in which the cavity 21 is formed may be constituted by the top plate 23 and the peripheral frame body 22.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 14 is a longitudinal sectional view showing a color filter according to the fourth embodiment of the present invention, and FIG. 15 is a longitudinal sectional view showing an organic EL display device according to the fourth embodiment of the present invention. is there. FIG. 16 is a longitudinal sectional view showing a color filter in a modified example of the fourth embodiment of the present invention, and FIG. 17 shows an organic EL display device in a modified example of the fourth embodiment of the present invention. It is a longitudinal cross-sectional view.

  The fourth embodiment shown in FIGS. 14 to 17 is different only in that a frame black matrix layer is formed over the entire circumference of the peripheral frame on the surface facing the other side of the peripheral frame of the color filter substrate. The other configuration is substantially the same as that of the first embodiment shown in FIGS. In the fourth embodiment shown in FIG. 14 to FIG. 17, the same parts as those in the first embodiment shown in FIG. 1 to FIG.

Color Filter As shown in FIG. 14, a frame black matrix layer 36 is formed over the entire circumference of the peripheral frame 22 on the surface 22 a facing the other side of the peripheral frame 22 of the color filter substrate 20. The frame black matrix layer 36 is formed from a light-shielding metal film 36a. The metal film 36a is formed on the surface 22a by, for example, vapor deposition, and the thickness thereof is, for example, 0.19 μm.

Organic EL Display Device As shown in FIG. 15, the color filter 10 in which the frame black matrix layer 36 is formed on the peripheral frame 22 and the glass substrate 47 on which the organic EL layer 44 is provided are bonded by an adhesive 30. The In the present embodiment, the thickness of the organic EL layer 44 is, for example, 5 μm, and the thickness of the adhesive 30 is, for example, 6 μm. At this time, as shown by arrows A and B in FIG. 15, when the light emitted from the organic EL layer 44 has light traveling in an oblique direction toward the peripheral frame 22, the light traveling in the oblique direction is frame black. It is shielded by the matrix layer 36. As a result, a so-called frame black matrix that forms a non-display area can be formed on the periphery of the organic EL display device 40.

  As described above, according to the present embodiment, the frame black matrix layer 36 composed of the metal film 36a is formed on the surface 22a facing the other side of the peripheral frame body 22 of the color filter substrate 20 over the entire circumference of the peripheral frame body 22. Is formed. Therefore, the light traveling in the oblique direction among the light emitted from the organic EL layer 44 can be shielded by the frame black matrix layer 36. As a result, a so-called frame black matrix that forms a non-display area can be formed on the periphery of the organic EL display device 40.

  In the present embodiment, an example in which the frame black matrix layer 36 is formed of a light-shielding metal film 36a is shown. However, the present invention is not limited to this, and the frame black matrix layer 36 may be formed from the light shielding resin 36b. For example, the frame black matrix layer 36 made of the light blocking resin 36b can be formed by applying a liquid light blocking resin material to the surface 22a. In this case, the thickness of the light shielding resin 36b is, for example, 1.2 μm. Alternatively, the frame black matrix layer 36 may be formed by providing another light-shielding material on the surface 22a.

  Moreover, in this Embodiment, the example in which the frame black matrix layer 36 was formed in the surface 22a which faces the other side among the peripheral frame bodies 22 of the color filter base material 20 over the peripheral frame body 22 was shown. However, the present invention is not limited to this, and as shown in FIGS. 16 and 17, a groove 22 b extending around the entire circumference of the peripheral frame body 22 is formed on the surface 22 a facing the other side of the peripheral frame body 22, and the peripheral edge The frame black matrix layer 36 may be formed over the entire circumference of the peripheral frame 22 on the surface 22a facing the other side of the frame 22 and the surface in the groove 22b formed on the surface 22a. As a result, a so-called frame black matrix that forms a non-display area is formed at the periphery of the organic EL display device 40, and the adhesive area between the adhesive 30 in the groove 22b and the inner surface of the peripheral frame 22 is increased. In addition, a predetermined amount of the adhesive 30 can be secured in the groove 22b.

  Moreover, in each said embodiment, the example from which the organic electroluminescent display apparatus 40 provided with the color filter 10 was obtained was shown. However, the present invention is not limited to this, and the color filter 10 in the present embodiment may be used in a liquid crystal display device or other display devices. Accordingly, it is possible to provide a display device in which the amount of moisture and oxygen entering from the side is reduced.

  Further, as shown by the two-dot chain line in the organic EL display device 40 of each embodiment described above, the entire circumference of the glass substrate 47 is placed on the contact surface 47a of the glass substrate 47 with the peripheral frame body 22 of the color filter substrate 20. A storage groove 47b for the adhesive 30 that stores the adhesive 30 may be formed. Accordingly, it is possible to reduce the thickness of the adhesive 30 while maintaining strong adhesion between the glass substrate 47 and the color filter base material 20, thereby allowing the adhesive 30 to pass through the organic EL display device. Moisture and oxygen entering the inside 40 can be reduced.

DESCRIPTION OF SYMBOLS 10 Color filter 11 Color filter layer 12 Colored resin layer 12a Red colored layer 12b Blue colored layer 12c Green colored layer 13 Black matrix layer 14 Overcoat layer 15 Barrier film 20 Color filter base material 21 Cavity 22 Peripheral frame body 22a Peripheral frame body Other side surface 22b Groove 23 Top plate 23a Cavity inner surface 23b Top plate one side surface 26 Material 30 Adhesive 31 Blast resist 31a Blast resist opening 32 Hydrofluoric acid resist 32a Hydrofluoric acid resist Opening 36 frame black matrix layer 36a metal film 36b light shielding resin 40 organic EL display device 41 anode 42 organic light emitting layer 43 cathode 44 organic EL layer 45 barrier film for organic EL layer 46 desiccant 47 glass substrate 47a cap base material Contact with the peripheral frame 47b glass substrate of the receiving groove 50 organic EL display device 51 a glass substrate 52 for the color filter low melting point glass frit 53 organic EL display device 54 resin adhesive

Claims (4)

A color filter substrate;
A color filter layer laminated on a color filter substrate;
The color filter base material has a top plate on one side and a peripheral frame on the other side, and a cavity is formed inside by these top plate and peripheral frame,
The color filter layer is laminated on the cavity inner surface of the top plate,
On the surface facing the other side of the peripheral frame body of the color filter substrate, a groove extending around the entire circumference of the peripheral frame body is formed,
The width of the groove is 1 μm or more,
The depth of the groove is 1 μm or more and 30 μm or less,
A frame black matrix layer was formed over the entire circumference of the peripheral frame on the surface facing the other side of the peripheral frame of the color filter substrate and the surface in the groove formed on the surface facing the other side . A color filter characterized by that.   The color filter according to claim 1, wherein the frame black matrix layer is formed of a metal film or a light shielding resin. A color filter according to claim 1;
A glass substrate disposed on the other side of the color filter and supporting the color filter;
An organic EL layer provided on a glass substrate and disposed in a cavity and having an anode, a cathode, and an organic light emitting layer provided between the anode and the cathode;
An organic EL display device comprising an adhesive for fixing a color filter on a glass substrate between a peripheral frame of the base material for color filter and the glass substrate.   The organic EL display device according to claim 3, wherein a storage groove for storing an adhesive is formed on a contact surface of the glass substrate with a peripheral frame of the base material for color filter.

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