JP6070026B2 - Organic EL display device - Google Patents

Description

  The present invention relates to a bottom emission type organic EL (Electro-Luminescence) display device.

  Conventionally, as shown in FIG. 3A, a bottom emission type organic EL (Electro-Luminescence) display device has a TFT 122 on one surface side of a substrate 121, and an organic EL light emitting layer 123 that emits white light by driving the TFT. An organic light emitting layer forming substrate (hereinafter also referred to as an EL substrate or an organic EL substrate) 120 and a colored layer for a color filter (a red colored layer 113R, a green colored layer 113G, It has a structure in which the color filter forming substrate 110 provided with the blue colored layer 113 </ b> B) is bonded to the adhesive layer 115.

  In the display device shown in FIG. 3A, the TFT formation substrate 120 is provided with an adhesive layer 124 over the entire surface so as to cover the organic EL light emitting layer 123, and further, the reflective reflection that is the cathode 125 when driven by the TFT. An electrode is disposed on the entire surface of the adhesive layer 124.

  Further, the B0 portion shown in FIG. 3A has a structure showing the material layer configuration in FIG.

  In this case, the first pixel is formed by simply forming a pixel-partitioning light-blocking portion (also referred to as a black matrix) 112 and colored layers 113R, 113G, and 113B for each color filter on one surface of a base material 111 that is a transparent substrate. In addition to the first embodiment, in addition to the first embodiment, a second embodiment in which a protective layer is disposed on the entire surface so as to cover the pixel classification light-shielding portion 112 and the color filters 113R, 113G, and 113B. In the state where the adhesive layer is disposed so as to cover the colored layers 113R, 113G, 113B of the respective colors of the first form or the protective layer of the second form, Also referred to as a color filter forming substrate, the protective layer may also serve as an adhesive layer, or the adhesive layer may also serve as a protective layer.

  In the display device shown in FIG. 3A, the adhesive layer 115 also serves as a protective layer, and includes a base material 111, a pixel section light-shielding portion (also referred to as a black matrix) 112, and colored layers 113R and 113G for each color filter. 113B and the adhesive layer 115 are combined to form a color filter forming substrate 110.

  In FIG. 3A, the dotted arrow indicates the emitted light.

  However, in the case of a conventional bottom emission type organic EL display device having such a bonded structure, since the bonding accuracy is inferior, it is necessary to increase the width of the pixel-shading light-shielding portion. There is a problem in that power consumption increases because the aperture ratio of the region is reduced.

  If the accuracy of pasting (hereinafter also referred to as positioning accuracy) is inferior, the aperture ratio of the pixel area is lowered and the luminance at the time of display is lowered as compared with the case where the pasting accuracy is good. In order to cope with this, it is necessary to increase the luminance electrically, resulting in an increase in power consumption.

  Further, since the color filter forming substrate 110 and the organic light emitting layer forming substrate 120 are bonded to each other with an adhesive layer (protective layer) 115, the colored layers 113R, 113G, 113B for each color for the color filter and the base material 121 are provided. There is also a problem that a problem of parallax and color mixing is likely to occur because an interval is generated between them.

  In addition, since the color filter forming substrate 110 and the organic light emitting layer forming substrate 120 are bonded to each other with an adhesive layer (protective layer) 115, there is a problem that the thickness is increased.

  Furthermore, since the color filter forming substrate 110 and the organic light emitting layer forming substrate 120 are separately manufactured and bonded, there is a problem that the manufacturing becomes expensive.

JP 2012-146517 A

  As described above, in the case of the conventional bottom emission type organic EL display device shown in FIG. 3A, which has a structure in which an organic light emitting layer forming substrate and a color filter forming substrate are bonded together by an adhesive layer, bonding is performed. The problem is that the aperture ratio of the pixel region decreases due to inaccuracy and the power consumption increases, and the color layers for the color filters of the color filter forming substrate and the base material of the organic light emitting layer forming substrate (FIG. 3). (Corresponding to 111 of (a)), a problem that parallax and color mixing are likely to occur, a problem that the thickness of the panel becomes thick, and a color filter forming substrate Since the organic light emitting layer forming substrate is separately manufactured and bonded, there is a problem that the manufacturing becomes expensive, and a countermeasure for this is required.

  The present invention corresponds to these, and is a conventional problem in a conventional bottom emission type organic EL display device having a structure in which an organic light emitting layer forming substrate and a color filter forming substrate are bonded together with an adhesive layer. The reduction in aperture ratio due to the bonding accuracy between the organic light emitting layer forming substrate and the color filter forming substrate can be improved, parallax and color mixing can be eliminated, the panel thickness can be reduced, and the production cost can be reduced. A bottom emission type organic EL display device is to be provided.

  In the bottom emission type organic EL display device of the present invention, a TFT and an organic light emitting layer are arranged on one surface of a base material which is a transparent substrate, and the organic light emitting layer is provided on the other surface side of the base material from the organic light emitting layer. A bottom emission type organic EL display device that emits emitted light, wherein the other surface of the substrate is formed with a pixel classification light-shielding layer and a colored layer for forming a color filter, and The one side of the substrate has a sealed structure.

  In the bottom emission type organic EL display device described above, a protective layer is formed as a whole so as to cover the colored layers for forming the color filters and the light shielding layer for pixel division. The protective layer is formed by laminating a film.

(Function)
The bottom emission type organic EL display device according to the present invention has a conventional bottom emission type structure having a structure in which an organic light emitting layer forming substrate and a color filter forming substrate are bonded together with an adhesive layer. It is possible to improve the aperture ratio reduction due to the bonding accuracy between the organic light emitting layer forming substrate and the color filter forming substrate, which has been a problem in organic EL display devices, and to reduce parallax and color mixing, and to reduce the thickness of the panel. Therefore, it is possible to provide a bottom emission type organic EL display device that can be manufactured at low cost.

  Specifically, a pixel classification light-shielding layer and a colored layer for forming a color filter are formed on the surface of the substrate other than the side on which the TFT and the organic light emitting layer are arranged, and the substrate This is achieved by having a structure in which the one side of is sealed.

  Specifically, the bottom emission type organic EL display device according to the present invention includes an organic light emitting layer forming substrate 120 and a color filter forming substrate as in the conventional bottom emission type organic EL display device shown in FIG. 110 on the other side of the substrate on which the organic light emitting layer is formed and the TFT on which the organic light emitting layer is disposed, not on the side on which the TFT or organic light emitting layer is disposed. Compared with the conventional bottom emission type organic EL display device, the colored layer for the color filter and the light-shielding layer for the pixel section are arranged. The accuracy of alignment with the colored layer for the color filter on the other surface of the substrate and the light shielding layer for pixel division can be increased, and as a result, the width of the light shielding layer for pixel division can be reduced. The possible increase the aperture ratio of the light-shielding layer, thereby, it is made possible to lower the power consumption.

  Compared with the conventional bottom emission type organic EL display device shown in FIG. 3, the alignment interval can be made smaller. Therefore, compared with the display device shown in FIG. 3, TFTs, organic light emitting layers, and color filters are used. Therefore, it is possible to increase the alignment accuracy between the colored layer and the light blocking layer for pixel division.

  In particular, in the case of a display device having high definition and minute pixels, the width of the light blocking layer for pixel division greatly affects the aperture ratio of the light blocking layer for pixel classification. The alignment accuracy between the TFT or organic light emitting layer, the color filter coloring layer, and the pixel classification light blocking layer, which is a determining factor, greatly affects the aperture ratio and greatly affects the luminance at the time of display. Therefore, it can be said that the bottom emission type organic EL display device of the present invention is more advantageous than the display device shown in FIG. 3 when it has high definition and minute pixels.

  There is a demand for increasing the aperture ratio of the light shielding layer for pixel division as the pixel is further miniaturized. Under such demand, the bottom emission type organic EL display device of the present invention and the conventional one shown in FIG. When the display device having the structure is manufactured with the same specifications, the bottom emission type organic material of the present invention is compared with the display device having the conventional structure shown in FIG. 3 because of the alignment accuracy with the light blocking layer for pixel division. The EL display device can increase the aperture ratio of the light blocking layer for pixel division.

  In the bottom emission type organic EL display device of the present invention, TFTs and organic light emitting layers of the organic light emitting layer forming substrate 120 are arranged as in the case of the conventional bottom emission type organic EL display device shown in FIG. The colored substrate for the color filter is not formed on the other surface of the base material in which the TFT and the organic light emitting layer are arranged on one surface side, instead of the structure in which the base material 111 and the color filter forming substrate 110 are bonded together by the adhesive layer 115. In addition, since it has a structure in which a light blocking layer for pixel division is arranged, a gap is generated between the colored layer for each color filter and the light blocking layer for pixel division and the base material of the organic light emitting layer forming substrate. In contrast, parallax and color mixing are less likely to occur compared to conventional bottom emission organic EL display devices.

  And it is possible to reduce the thickness.

  The side on which the TFT and the organic light emitting layer are arranged is sealed, and the reliability of the organic light emitting layer can be ensured.

  Furthermore, the bottom emission type organic EL display device of the present invention includes a color filter forming substrate 110 and an organic light emitting layer forming substrate as in the conventional bottom emission type organic EL display device shown in FIG. 120 is manufactured separately and bonded to each other. In other words, the base 111 of the color filter forming substrate 110 and the base of the organic light emitting layer forming substrate 120 of the display device shown in FIG. With the structure also used as the material 121, the manufacturing cost can be reduced.

  In addition, in the above bottom emission type organic EL display device, a form in which a protective layer is formed as a whole so as to cover the colored layers for forming the color filters and the light shielding layer for pixel division may be mentioned. The protective layer formed by laminating a film is particularly preferable from the viewpoint of production.

  As described above, in the conventional bottom emission type organic EL display device having the structure in which the organic light emitting layer forming substrate and the color filter forming substrate are bonded to each other by the adhesive layer, the organic light emitting which has been a problem in the related art. Bottom emission type that can improve the aperture ratio reduction due to the bonding accuracy between the layer forming substrate and the color filter forming substrate, reduce parallax and color mixing, reduce the thickness of the panel, and reduce the manufacturing cost. The organic EL display device can be provided.

FIG. 1A is a cross-sectional view showing an example of an embodiment of a bottom emission type organic EL display device of the present invention, and FIG. 1B is a cross-sectional material at A0 part of FIG. It is the figure which showed the structure. FIG. 2 is a schematic process cross-sectional view illustrating a manufacturing process of the bottom emission type organic EL display device illustrated in FIG. 1. FIG. 3A is a cross-sectional view showing an example of an embodiment of a conventional bottom emission type organic EL display device, and FIG. 3B is a cross-sectional material configuration at B0 part of FIG. FIG.

  First, an example of an embodiment of a bottom emission type organic EL display device of the present invention will be described with reference to FIG.

  In the bottom emission type organic EL display device of this example, as shown in FIG. 1A, a TFT 22 and an organic light emitting layer 23 are arranged on one surface of a base material 21 which is a transparent substrate. 21 is a bottom emission type organic EL display device that emits light emitted from the organic light emitting layer to the other surface side of the light emitting device.

  On the other surface of the base material 21, the pixel classification light blocking layer 12 and the colored layers 13R, 13G, and 13B for forming the color filters are formed, and the one side of the base material 21 is The entire structure is sealed by a sealing material 29 and a base material 26 made of a transparent substrate with a cathode 25 serving as a reflective electrode inside.

  Further, a protective layer 14 is formed on the entire surface so as to cover the colored layers 13R, 13G, and 13B for forming the color filters and the light shielding layer 12 for pixel division.

  In FIG. 1A, the dotted arrow indicates the emitted light.

  In the bottom emission type organic EL display device of this example, the TFT 22 and the organic light emitting layer 23 are formed on one surface of the base 21 of the organic light emitting layer forming substrate 20, and the light emitted from the organic light emitting layer 23 is emitted. In this structure, a colored layer for color filters and a light-shielding layer for pixel division are formed on the other surface of the substrate 21 that is not the aforementioned one surface. Since the base material of the layer forming substrate 20 is shared by one base material 22, the conventional color filter forming substrate 110 and the organic light emitting layer forming substrate 120 shown in FIG. Compared with the bottom emission type organic EL display device having a structure in which the layer (also referred to as a protective layer) 115 is bonded together, the TFT 22 and the organic light emitting layer 23 on the one surface side and the coloring for the color filter on the other surface Layer 13 , 13G, 13B, and the position accuracy with respect to the light shielding layer 12 for pixel division can be increased. As a result, the width of the light shielding layer for pixel division can be increased, so that the aperture ratio of the light shielding layer for pixel division can be increased. This makes it possible to reduce power consumption.

  In addition, the bottom emission type organic EL display device of this example is similar to the conventional bottom emission type organic EL display device shown in FIG. Since the substrate 121 and the color filter forming substrate 110 on which the 123 is arranged are not bonded to each other by the adhesive layer (protective layer) 115, the colored layers 13R, 13G, and 13B of each color for the color filter and the organic light emitting layer are formed. Since there is no gap between the substrate 20 and the base material 21, parallax and color mixing are less likely to occur compared to the conventional bottom emission type organic EL display device shown in FIG. It is possible to reduce the thickness of the entire apparatus.

  Further, the side of the base material 21 on which the TFT 22 and the organic light emitting layer 23 are disposed is sealed, and the reliability of the organic light emitting layer can be ensured.

  In addition, the bottom emission type organic EL display device of this example also uses the base material 21 provided with the TFT 22 and the organic light emitting layer 23 of the organic light emitting layer forming substrate 20 as the base material of the color filter forming substrate 10. Since it has a structure, it can be manufactured at low cost.

  Next, a method for manufacturing the bottom emission type organic EL display device of this example will be briefly described with reference to FIG.

First, a TFT 22, an alignment mark (not shown), a light emitting anode 28 for driving the TFT 22, on a surface of a base material 21 (FIG. 2A) made of a transparent substrate by a known method, A light emitting cathode 25 is formed on one surface of the substrate 21 to drive the organic light emitting layer 23 and the TFT 22 which is a reflective reflective electrode. (Fig. 2 (b))
The substrate shown in FIG. 2B is also referred to herein as a TFT formation substrate.

On the other hand, a plate-like base material 26 for sealing is prepared (FIG. 2C), and the TFT formation shown in FIG. A board | substrate and the base material 26 shown in FIG.2 (c) are bonded together. (Fig. 2 (d))
At this time, the side surface portion is covered with the sealing material 29 and the whole is sealed, and the organic light emitting layer forming substrate 20 is manufactured.

In this way, the organic light emitting layer forming substrate 20 is manufactured. However, the substrate 21 of the manufactured organic light emitting layer forming substrate 20 has a well-known surface side that is not the surface side on which the TFT 22 or the organic light emitting layer 23 is formed. The light shielding layer 12 for pixel division and the colored layers 13R, 13G, and 13B for forming color filters are formed by photolithography using a method, and a protective layer 14 is disposed so as to cover the whole. (Fig. 2 (e))
Since the organic light emitting layer forming substrate 20 is entirely sealed and the base material 21 and the substrate 26 are arranged on the front and back, it can be handled in the same manner as the base material of a normal color filter forming substrate, Similarly to the production of the filter forming substrate, the light blocking layer 12 for pixel division and the colored layers 13R, 13G, and 13B for forming color filters can be formed on the surface of the base material 21 by photolithography. .

  The alignment when forming the light blocking layer 12 for pixel division and the colored layers 13R, 13G, and 13B for forming the color filters is the alignment mark provided on the surface of the substrate 21 on the side where the TFT 22 is formed. (Not shown).

  In the case of manufacturing the conventional display device shown in FIG. 3A, organic light emission is performed using an alignment mark (not shown) formed on the TFT 122 side of the base material 121 of the organic light emitting layer forming substrate 120. The layer forming substrate 120 and the color filter forming substrate 110 are aligned and bonded to each other. When the conventional display device shown in FIG. 3A is manufactured, the bottom emission type of this example shown in FIG. Compared with the method for manufacturing the organic EL display device, the surface on which the light blocking layer 12 for pixel division of the color filter forming substrate 110 and the color layers 13R, 13G, and 13B for forming the color filters are formed, and the organic light emitting layer formation is performed. Since the distance from the alignment mark of the base material 121 of the substrate 120 is large, the bonding accuracy (also referred to as alignment accuracy) is poor.

  Since there are substrate distortion and pattern distortion, the bonding accuracy is about ± 5 μm at best.

  Furthermore, since it takes time to align with high accuracy, the productivity also decreases.

Note that each part and the manufacturing method are well known and will not be described here. (Refer to the description of each member and its formation method)
Next, each member of the organic EL display device shown in FIG.

<Organic light emitting layer forming substrate 20>
(1) Substrate 21
As the base material 21, a transparent substrate is used, but a transparent inorganic substrate having no flexibility such as quartz glass, Pyrex (registered trademark) glass, synthetic quartz plate, and the like, and a transparent resin film, A flexible transparent resin substrate such as an optical resin plate can be used, and an inorganic substrate is particularly preferable, and a glass substrate is preferably used among the inorganic substrates.

  Furthermore, it is preferable to use an alkali-free type glass substrate among the glass substrates.

An alkali-free type glass substrate is suitable because it is excellent in dimensional stability and workability in high-temperature heat treatment, and does not contain an alkali component in the glass.
(2) TFT
The light emission operation of the organic issue layer 23 is controlled by driving the TFT 22. The TFT is a semiconductor and is made of a well-known member, and is manufactured in a well-known semiconductor manufacturing, and the description is omitted here.
(3) Organic light emitting layer 23
The organic light emitting layer 23 is composed of one or more organic layers including at least a light emitting layer.

  The organic light emitting layer 23 in this example is a white light emitting organic light emitting layer, and has a material configuration as shown in FIG. 3B, for example.

  The organic light emitting layer 23 shown in FIG. 3B uses three materials that emit red, green, and blue, and emits white light together.

  The organic EL element 27 includes an organic light emitting layer 23 containing a light emitting material, an anode 28, and a cathode 25, and the light emission operation is controlled by driving the TFT 22.

  Examples of the organic layer constituting the organic light emitting layer 23 other than the light emitting layer include a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer.

  This hole transport layer is often integrated with the hole injection layer by imparting a hole transport function to the hole injection layer.

  In addition, as the organic layer constituting the organic light emitting layer 23, holes or electrons such as a hole blocking layer and an electron blocking layer are prevented from penetrating, and further, exciton diffusion is prevented and excitons are included in the light emitting layer. A layer for increasing the recombination efficiency and the like can be given by confining.

  The organic light emitting layer may be of a general structure, and only the light emitting layer, hole injection layer / light emitting layer, hole injection layer / light emitting layer / electron injection layer, hole injection layer / hole blocking layer. / Light emitting layer / electron injection layer, hole injection layer / light emitting layer / electron transport layer, and the like can be exemplified.

  Note that the light emitting material in the white light emitting organic EL element 27 is rarely composed of a single compound, and generally two or three different light emitting materials are used. The material configuration shown in 3 (b) is not limited.

  The emission spectrum is a combination of the spectra of the luminescent materials of each color.

(Anode 28, Cathode 25)
As the conductive material for forming the electrode layers of the anode 28 and the cathode 25, a metal material is generally used. However, an organic material or an inorganic compound may be used, or a plurality of materials may be mixed and used.

  In addition, the electrode layers of the anode and the cathode are appropriately selected as to whether or not they have transparency depending on the light extraction surface.

  In this example, since the cathode 25 serves as a reflective electrode, a reflective metal is used as the electrode.

  In this example, since it is a bottom emission type, the anode 28 is a transparent electrode.

  A conductive material having a high work function is preferably used for the anode 28 so that holes can be easily injected, and a conductive material having a low work function is preferably used for the cathode 25 so that electrons can be easily injected.

  Examples of the conductive material include In—Zn—O (IZO), In—Sn—O (ITO), Zn—O—Al, and Zn—Sn—O when transparency is required. In the case where transparency is not required, metals can be used, specifically, Au, Ta, W, Pt, Ni, Al, Pd, Cr, Al alloy, Ni alloy, Cr alloy, etc. be able to.

  Both electrode layers of the anode 28 and the cathode 25 preferably have a relatively small resistance.

  As a method for forming the electrode layer, a general method for forming an electrode can be used, and examples thereof include a sputtering method, an ion plating method, a vacuum deposition method, a CVD method, and a printing method.

  An example of the patterning method for the electrode layer is a photolithography method.

(Adhesive layer 24)
A transparent adhesive resin material is used, and examples thereof include a thermosetting resin composition and a photocurable resin composition.

  The photocurable resin composition is the same as the binder resin used for the color layers for forming the color filter, for example, acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber A photosensitive resin having a reactive vinyl group is used.

  In this case as well, a photopolymerization initiator may be added to the photosensitive resin composition for forming colored portions containing the photosensitive resin, and further, a sensitizer, a coating property improver, and a development improver as necessary. Further, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant and the like may be added.

  As the thermosetting resin composition, an epoxy resin, an oxetane resin, or the like is used. If necessary, a curing agent such as an acid or an amine may be added.

(Substrate 26)
Transparency is not necessary, but the same material as the substrate 21 is used.

(Sealing material 29)
As the sealing material 29 for sealing the side surface portion of the organic light emitting layer forming substrate 20, for example, an inorganic material such as SiO2, Si3N4, Al2O3, ITO, Six Oy, etc., an organic material such as an epoxy resin is used. First, acrylic resin, urethane resin, or the like is used.

<Light shielding layer for pixel division (also referred to as black matrix) 12>
For example, carbon black covered with a resin such as an epoxy resin is used as the light-shielding colored layer for forming the pixel-segmenting light-shielding layer 12 for segmenting the pixel regions of the color layers for the color filters. A pigment (pigment) dispersed in a binder resin is used.

  In the case where carbon black is dispersed as a pigment (pigment) in a binder resin, the light-shielding resin layer can be formed with a relatively thin film thickness.

  Here, the light-blocking colored layer of the black matrix is formed using a photolithography method. In this case, as the binder resin, for example, an acrylate type, a methacrylate type, a polyvinyl cinnamate type, or a cyclized rubber type is used. A photosensitive resin having a reactive vinyl group is used.

  In this case, a photopolymerization initiator may be added to the photosensitive resin composition for forming a black matrix containing a black colorant and a photosensitive resin, and further, if necessary, a sensitizer, a coatability improver, A development improver, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, and the like may be added.

  The light-blocking colored layer of the black matrix may be formed using a printing method or an inkjet method. In this case, examples of the binder resin include polymethyl methacrylate resin, polyacrylate resin, and polycarbonate resin. , Polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, polyvinyl chloride resin, melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid resin, polyamide resin, etc. .

  In addition, the opening pattern shape of the light shielding layer for pixel division and the arrangement of the colored layers of each color are not limited.

  There are also examples in which the shape of the opening pattern of the light blocking layer for pixel division is a stripe shape, and the arrangement of the colored layers is changed, such as a dogleg shape or a delta arrangement.

<Colored layers 13R, 13G, 13B>
In this example, the colored layers for forming the color filters are the three colored layers of the red colored layer 13R, the green colored layer 13G, and the blue colored layer 13B.

  The colored layer of each color is formed by using a resin composition for forming a colored portion in which a coloring material (also referred to as a coloring material) such as a pigment or dye of each color is dispersed or dissolved in a binder resin, and a photolithography method (also called a photolithography method). Say).

  As the binder resin used in the colored layer, for example, a photosensitive resin having a reactive vinyl group such as acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber is used.

  In this case, a photopolymerization initiator may be added to the photosensitive resin composition for forming a colored part containing a colorant and a photosensitive resin, and further a sensitizer, a coating property improver, and a development as necessary. You may add an improving agent, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, etc.

  The thickness of the colored layer of each color is usually set to about 1 μm to 5 μm.

  The color of the colored layer is not particularly limited as long as it includes at least three colors of red, green, and blue. For example, three colors of red, green, and blue, or red, green, blue, and yellow Or five colors such as red, green, blue, yellow, and cyan.

  In particular, four colors of red, green, blue, and white (transparent) are preferable from the viewpoint of power consumption.

  Examples of the colorant used in the red (also referred to as R) colored layer include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. Can be mentioned.

  These pigments may be used alone or in combination of two or more.

  Examples of the colorant used in the green (also referred to as G) colored layer include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, and isoindoline pigments. Examples thereof include pigments and isoindolinone pigments.

  These pigments or dyes may be used alone or in combination of two or more.

  Examples of the colorant used in the blue (also referred to as B) coloring layer 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.

<Protective layer 14>
Examples of the material for the protective layer include a thermosetting resin composition and a photocurable resin composition that are formed by coating, and particularly when the film member is formed by laminating a film. From the aspect, it is preferable.

  The photocurable resin composition for forming a coating film is the same as the binder resin used for the colored layer for forming each color filter, for example, acrylate, methacrylate, polyvinyl cinnamate, or ring. A photosensitive resin having a reactive vinyl group such as a synthetic rubber is used.

  In this case as well, a photopolymerization initiator may be added to the photosensitive resin composition for forming colored portions containing the photosensitive resin, and further, a sensitizer, a coating property improver, and a development improver as necessary. Further, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant and the like may be added.

  In the first example, the color filter forming substrate is impositioned and the red, green, and blue colored layers 13R, 13G, and 13B, the pixel-segmenting light-shielding portion 13M, and the frame portion 12 are formed. The resin composition is applied by a spin coating method.

  Examples of the thermosetting resin composition for forming a coating film include those using an epoxy compound and those using a thermal radical generator.

  Examples of the epoxy compound include known polyvalent epoxy compounds that can be cured by a carboxylic acid or an amine compound. Examples of such an epoxy compound include “Epoxy resin handbook” edited by Masaki Shinbo, published by Nikkan Kogyo Shimbun. (1987) and the like, and these can be used.

  The thermal radical generator is at least one selected from the group consisting of persulfates, halogens such as iodine, azo compounds, and organic peroxides, more preferably azo compounds or organic peroxides.

  Examples of the azo compound include 1,1′-azobis (cyclohexane-1-carbonitrile, 1-[(1-cyano-1-methylethyl) azo] formamide, 2,2′-azobis- [N- (2-propenyl). ) -2-methylpropionamide], 2,2′-azobis (N-butyl-2-methylpropionamide), 2,2′-azobis (N-cyclohexyl-2-methylpropionamide) and the like, Examples of the organic peroxide include di (4-methylzenzoyl) peroxide, t-butylperoxy-2-ethylexanate, 1,1-di (t-hexylperoxy) cyclohexane, 1,1-di ( t-butylperoxy) cyclohexane, t-butylperoxybenzoate, t-butylperoxy-2-ethylhexyl monocarbonate, - butyl-4,4-di - (t-butylperoxy) Butaneto, and the like dicumyl peroxide.

  Examples of the film member for forming a laminate include a thermosetting resin film (also referred to as a sheet). On the side where a light-blocking layer for pixel division and a colored layer for each color filter are formed by a roll laminator or the like. The film member is placed on the substrate, and the resin is flowed with heat and pressure to be sealed.

  For example, when both sides of a resin film based on a semi-cured epoxy resin are used in a form protected with a peelable film, it is easy to handle, and is applied in a short time at a low temperature with a roll laminator. Can be cured.

  The display device of the present invention is not limited to the example shown in FIG.

  For example, in the display device shown in FIG. 1, in addition to a pixel (also referred to as a colored pixel) provided with colored layers of R, G, and B for color filters, a highly light transmissive pixel (hereinafter referred to as WHITE) having high light transmittance. A form in which the pixel is also provided on the colored layer forming side of each color.

  A high light transmission pixel is usually provided with an uncolored resin layer or a slightly colored resin layer.

  Further, in the display device shown in FIG. 1 and the display device having the above-described high light transmission pixel, when external light is incident on the display portion, the cathode electrode which is a reflective electrode is used to improve the appearance when the power is turned off. In order to reduce reflected light due to reflection, a light absorption layer may be arranged on the colored layer forming side of each color so as to cover the WHITE pixel region or the pixel region where the WHITE pixel region and the colored layer are formed. good.

  As a material for forming the light absorption layer, for example, a resin containing carbon black as a coloring material, BLUE pigment for color adjustment, and the like dispersed therein can be used. The coating is made using a resin having a composition obtained by removing a color material from a resin composition for forming a light-blocking layer for pixel division or a colored layer of each color.

  With the same specification, the aperture ratio of the light shielding layer for pixel division is set to 50%, and the bottom emission type organic EL display device having the conventional structure shown in FIG. 3 and the bottom emission type organic EL display of the present invention shown in FIG. An EL display device was manufactured, and the alignment accuracy of the TFT or organic light emitting layer, the color layer for the color filter, and the light shielding layer for the pixel division was measured. In the conventional display device, the alignment accuracy was The average error is about ± 6 μm, whereas in the display device of the present invention, the alignment accuracy error is about ± 3 μm on average.

  Here, the opening pitch was 105 μm in the X direction, 315 μm in the Y direction, and the thinnest line width of the light blocking layer for pixel division was 12 μm.

  In the conventional display device, since the alignment accuracy with the light blocking layer for pixel division is about ± 6 μm as described above, the aperture ratio cannot be increased to 60%, but the bottom emission type organic EL of the present invention In the case of a display device, as described above, since the alignment accuracy with the light blocking layer for pixel division is about ± 3 μm, the aperture ratio can be increased to 60%. Similarly, the display device of the present invention was manufactured by changing only the aperture ratio of 60% to 60% without changing the others.

  With respect to the display device of the present invention manufactured with an aperture ratio of 60% and a conventional display device manufactured with an aperture ratio of 50%, the luminance when displayed is a luminance meter (SR3 UL-1; The bottom emission type organic EL display device of the present invention shown in FIG. 1 has an average brightness improvement of about 20% compared to the display device having the conventional structure shown in FIG. Was.

DESCRIPTION OF SYMBOLS 10 Color filter formation board | substrate 11 Base material 12 Light shielding layer 13R for pixel division Red colored layer (it is also called red colored resin layer)
13G green colored layer (also called green colored resin layer)
13B Blue colored layer (also called blue colored resin layer)
14 Protective layer 20 Organic light emitting layer forming substrate 21 Base material 22 TFT
23 Organic Light-Emitting Layer 24 Adhesive Layer 25 Cathode (Reflective Electrode)
26 Substrate 27 Organic EL element 28 Anode 29 Sealing material 110 Color filter forming substrate 112 Light blocking layer 113R for pixel division Red colored layer (also referred to as red colored resin layer)
113G Green colored layer (also called green colored resin layer)
113B Blue colored layer (also called blue colored resin layer)
115 Adhesive layer (also called protective layer)
120 Organic light emitting layer forming substrate 121 Base material 122 TFT
123 Organic light emitting layer 124 Adhesive layer 125 Cathode (reflective electrode)
126 Substrate 127 Organic EL Element 128 Anode 129 Sealant

Claims (3)

A bottom emission type organic EL display in which a TFT and an organic light emitting layer are arranged on one surface of a base material which is a transparent substrate, and light emitted from the organic light emitting layer is emitted to the other surface side of the base material. In the apparatus, a light-blocking layer for pixel division and a colored layer for forming a color filter are directly formed on the other surface of the base material, and the one side of the base material is sealed. A bottom emission type organic EL display device characterized by having a structure.   2. The bottom emission type organic EL display device according to claim 1, wherein a protective layer is entirely formed so as to cover the colored layers for forming the color filters and the light shielding layer for pixel division. A bottom emission type organic EL display device.   3. The bottom emission type organic EL display device according to claim 2, wherein the protective layer is formed by laminating a film.

Images