JP5862424B2 - Color filter substrate used for organic electroluminescence display device, color filter for organic electroluminescence display device, and organic electroluminescence display device - Google Patents

Description

  The present invention relates to a color filter substrate used for an organic electroluminescence display device, a color filter for an organic electroluminescence display device, and organic electroluminescence comprising these (hereinafter sometimes referred to as “organic EL”). The present invention relates to a display device.

  In recent years, flat displays have been used in many fields and places, and their importance has been increasing with the progress of computerization.

  Currently, liquid crystal displays (LCD) can be said to be at the center of flat displays, but organic EL, inorganic EL, and plasma display panels (PDP) can be used as flat displays based on a different display principle from liquid crystal displays (LCD). Development of a light emitting diode display device (LED), a fluorescent display tube display device (VFD), a field emission display (FED), and the like is also actively conducted.

  Each of these new flat displays is called a self-luminous type, and is greatly different from a liquid crystal display (LCD) in the following points, and has an excellent feature not found in a liquid crystal display (LCD).

  A liquid crystal display (LCD) is called a light-receiving type, and the liquid crystal does not emit light by itself, but operates as a so-called shutter that transmits and blocks external light to constitute a display device. For this reason, a light source is required and generally a backlight is required. On the other hand, since the device itself emits light in the self-luminous type, no separate light source is required. In addition, in a light receiving type such as a liquid crystal display (LCD), the backlight is always lit regardless of the display function, and power that is almost the same as in the full display state is consumed. On the other hand, the self-luminous type has the advantage that less power is consumed compared to the light-receiving type display device because only the portion that needs to be lit according to the display information consumes power. Exists.

  Similarly, in a liquid crystal display (LCD), the light from the backlight source is shielded to obtain a dark state. Even with a small amount, it is difficult to completely eliminate light leakage. Since the state where no light is emitted is just a dark state, an ideal dark state can be easily obtained, and the self-light-emitting type is overwhelmingly superior in contrast. In addition, the liquid crystal display (LCD) uses polarization control based on the birefringence of the liquid crystal, so the display state changes greatly depending on the viewing direction, so-called viewing angle dependence is strong. Absent. Furthermore, since a liquid crystal display (LCD) uses a change in orientation derived from the dielectric anisotropy of liquid crystal, which is an organic elastic material, in principle, the response time to an electric signal is 1 ms or more. On the other hand, the above self-luminous technology, which is being developed, uses so-called carrier transitions such as electrons / holes, electron emission, plasma discharge, etc. Yes, it is so fast that it is incomparable with liquid crystals, and there is no problem of afterimages due to slow response of liquid crystal displays (LCDs).

  Recently, researches on organic EL display devices are particularly active among these. (1) Three primary color light emitting layers are formed in a predetermined pattern for each light emission color, (2) White light emitting light emitting layer is used, Display through three primary color filters, (3) Use a blue light emitting layer, install a color conversion layer using fluorescent dye, convert blue light into green fluorescence or red fluorescence and display three primary colors Something has been proposed.

  Organic EL display devices have been put to practical use mainly for small screens of about several inches such as in-vehicle navigation, mobile phones, digital cameras, etc., but recently, large screens of, for example, 20 inches or more as represented by flat-screen televisions. Development of computerization has been demanded.

  However, when the organic EL display device has a large screen of, for example, 20 inches or more, the wiring length for supplying drive current to each pixel is extremely different between the outer peripheral portion and the central portion of the screen. For this reason, in the central portion of the screen, the degree of voltage drop is larger than that of the outer peripheral portion of the screen, resulting in inconvenience that luminance unevenness occurs. This tendency becomes more prominent as the screen becomes larger. In particular, the wiring for supplying the drive current is conducted through a transparent electrode such as ITO formed on the organic EL layer including the light emitting layer, and this ITO has a larger resistance than, for example, metal Cu, so that the ITO The effect of voltage drop is large.

  In addition, there are a passive matrix method and an active matrix method as a driving method of the organic EL display device, but the former has a problem that it is difficult to realize a large-sized and high-definition display device although the structure is simple. In order to increase the size, the latter active matrix system has been actively developed. In the active matrix system, a current flowing in an organic EL element arranged for each pixel is controlled by a TFT (Thin Film Transistor) in a drive circuit provided for each organic EL element.

  In addition, the following patent documents 1-patent document 4 are mentioned as a prior art considered to be related to this invention.

Japanese Patent No. 4489472 Japanese Patent No. 4367346 JP 2009-26828 A JP 2011-96282 A

  In Patent Document 1, even if the size is increased, the upper portion located on the element isolation bank formed on the first substrate is one of the purposes to prevent unevenness in light emission luminance due to the voltage drop caused by the upper transparent electrode. The first substrate and the second substrate are arranged to face each other so that the electrode and the conductive light shielding pattern formed on the second substrate are electrically connected, and at least the upper electrode or the conductive light shielding pattern is An organic electroluminescence display device connected to a feeding point has been disclosed.

  However, in Patent Document 1, an element isolation bank which is a columnar protrusion is formed on the first substrate side on which a TFT or an organic EL layer is formed. Since the TFT and the organic EL layer are formed, the first substrate side has a complicated configuration, and the provision of the element isolation bank on this is compared with the process provided on the opposite second substrate side. Thus, it can be said that the probability that the yield decreases is extremely high. Further, the yield reduction on the first substrate side is extremely complicated because it is formed through a complicated process, and the process of forming the TFT and the organic EL layer with a large number of steps is wasted. Further, an organic EL element including an organic EL layer sandwiched between a pair of electrodes is usually covered and protected by a sealing layer for protecting the organic EL element, and the presence of this sealing layer Therefore, it is necessary to consider technically how to establish conduction with the coated electrode.

  Patent Document 2 discloses a high-output-quality organic EL device that can further reduce the resistance of the power supply wiring and the second electrode, reduce display luminance unevenness, and achieve high luminance and high contrast. In this proposal, the same problem as in Patent Document 1 can occur.

  Patent Document 3 proposes a top-emission organic EL display device developed for the purpose of improving the in-plane uniformity of the potential of the counter electrode. The same problem as document 1 may occur.

  In Patent Document 4, since the effective resistance value of the transparent electrode can be lowered and a uniform voltage can be applied to the organic EL layer, display defects such as display unevenness can be prevented. Although the proposal of the light-emitting device which can be performed is made | formed, the problem similar to the said patent document 1 may arise also in the said proposal.

  The present invention was devised under such circumstances, and the purpose thereof is, for example, when developing a large screen organic EL display device, the luminance unevenness between the central portion of the screen and the outer peripheral portion of the screen. Color filter substrates and color filters used in organic electroluminescence display devices that can prevent the occurrence of non-uniformity of brightness and can be formed in a configuration that reduces the cost risk by forming the means for preventing the occurrence of uneven brightness. Another object is to provide an organic electroluminescence display device using the above.

An invention for solving the above-mentioned problems is a color filter substrate used in an organic electroluminescence display device, which is formed around a transparent substrate, a pixel portion formed on the transparent substrate, and the pixel portion. A non-pixel area, a metal auxiliary electrode layer is provided in the non-pixel area, and a convex column is formed in at least one place of the non-pixel area. An electrode layer is provided on the top and side of the column, and the metal auxiliary electrode layer in the non-pixel area and the electrode layer of the convex column are electrically connected, and are provided on the top of the convex column. Except for the electrode layer, a barrier layer is formed on the outermost surface in at least a part of the other region, and the barrier layer is made of an inorganic material .

  In the above invention, the non-pixel area may have an intersection where a plurality of lines intersect, and the convex column may be formed at the intersection.

  In the invention described above, the convex column may have a tapered shape whose diameter gradually decreases from the base side to the top.

  Further, in the above invention, when the arrangement density D1 of the convex columns arranged in the central portion of the substrate is compared with the arrangement density D2 of the convex columns arranged in the outer peripheral portion of the substrate , D1> D2.

The invention for solving the above-mentioned problems is a color filter for an organic electroluminescence display device, comprising a transparent substrate, a pixel portion formed on the transparent substrate, and a non-pixel area formed around the pixel portion. The non-pixel area is provided with a metal auxiliary electrode layer, and a convex column is formed in at least one location of the non-pixel area, and the top of the convex column and An electrode layer is provided on the side, and the metal auxiliary electrode layer in the non-pixel area and the electrode layer of the convex column are electrically connected, except for the electrode layer provided on the top of the convex column. , the outermost surface of at least a portion of the other region has a barrier layer is formed, the barrier layer is a color filter used in the organic electroluminescence display device configured of an inorganic material And having a plate, and a colored layer formed on the pixel portion of the substrate for the color filter.

  The invention for solving the above-mentioned problems includes a transparent substrate, a pixel portion formed on the transparent substrate, and a non-pixel area formed around the pixel portion, and the non-pixel area. Are provided with a metal auxiliary electrode layer, at least one convex column is formed in the non-pixel area, and an electrode layer is provided on the top and sides of the convex column. And the metal auxiliary electrode layer in the non-pixel area is electrically connected to the electrode layer of the convex column, and except for the electrode layer provided on the top of the convex column, at least a part of the other region. An organic electroluminescent device comprising: a color filter substrate used in an organic electroluminescence display device having a barrier layer formed on a surface; and a colored layer formed on a pixel portion of the color filter substrate. An organic electroluminescence display device comprising: a color filter for display device; and an organic EL element side substrate having a substrate and an organic electroluminescence element including an organic EL layer formed on the substrate, wherein the color filter The organic EL element side substrate is arranged so that the colored layer and the organic electroluminescence element face each other, and the organic electroluminescence element sandwiches the organic EL layer and the organic EL layer. A pair of lower surface electrode layers and upper surface transparent electrode layers arranged in such a manner that the portion of the metal electrode layer formed on the top of the convex column and the upper surface transparent electrode layer are in contact with each other so that conduction can be achieved. It is formed.

  According to the color filter substrate used in the organic electroluminescence display device of the present invention, the color filter for organic electroluminescence display device, and the organic electroluminescence display device using these, a metal auxiliary electrode layer is provided in the non-pixel area. In addition, an electrode layer is provided on the top and sides of the convex column, and these are electrically connected. Therefore, particularly when a large screen organic EL display device is configured, the center of the screen And unevenness of brightness between the outer periphery of the screen can be prevented.

  Furthermore, since the barrier layer is formed on the outermost surface in at least a part of the other regions except for the electrode layer provided on the top of the convex column, it is a factor that deteriorates the performance of the organic electroluminescence display device. It is possible to effectively suppress generation of various components from the various layers constituting the color filter substrate and the color filter.

It is sectional drawing which shows the color filter for organic EL display devices of this invention, and an organic EL element side board | substrate. It is sectional drawing of the organic electroluminescence display formed by joining the color filter for organic electroluminescence displays shown in FIG. 1, and the organic electroluminescent element side board | substrate. It is the top view which showed a part of color filter for organic EL display devices which is 1st Embodiment, and is equivalent to the (alpha)-(alpha) arrow top view of FIG.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the form demonstrated below, In the range which does not deviate from a technical thought, it can implement in various deformation | transformation. In the accompanying drawings, the vertical and horizontal scales may be exaggerated for the sake of explanation, and the actual scales may differ.

  Further, the following description will focus on the color filter for an organic EL display device of the present invention, but the present invention is not limited to this. If only the colored layer is removed from the color filter described below, the present invention will be described. It becomes a substrate for a color filter.

<First Embodiment>
A color filter for an organic EL display device and an organic EL display device according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view showing a color filter 10 for an organic EL display device and an organic EL element side substrate 70 of the present invention. The cross-sectional views of these constituent members are shown in a plan view of the color filter 10 for an organic electroluminescence display device shown in FIG. 3, that is, ABCD-F-G-G-H-I-J-K-L. It is sectional drawing which looked at the cut surface in the -MN line, and the cut surface of the organic EL element side board | substrate 70 according to it. FIG. 2 is a cross-sectional view of the organic EL display device 100 formed by bonding the organic EL display device color filter 10 and the organic EL element side substrate 70 shown in FIG. FIG. 3 is a plan view showing a part of the color filter 10 for an organic EL display device according to the first embodiment, and corresponds to a plan view taken along the line α-α in FIG.

(Description of Color Filter 10 for Organic EL Display Device)
The color filter 10 for an organic EL display device according to the present invention is a color filter for an organic EL display device (hereinafter simply referred to as an organic EL display device) used in an organic EL display device using light from an organic EL layer including a light emitting layer of an organic EL element as a light emission source. , Sometimes referred to as a color filter).

  As shown in FIG. 1, the color filter 10 according to the present invention includes a transparent substrate 11, a colored layer 13 that is a pixel portion formed on the transparent substrate 11, and a non-pixel formed around the colored layer 13. And an area 12. Usually, when attention is paid to most of the other colored layers 13 excluding the colored layer 13 arranged on the outermost periphery of the substrate, the non-pixel area 12 exists in a gap portion between the adjacent colored layers 13. Note that the pixel portion refers to a portion through which light is transmitted when the color filter is used in various display devices. In the color filter 10 of the present invention, the colored layer 13 is not necessarily formed in the pixel portion. Alternatively, a part of the pixel portion may simply be a region through which light is transmitted.

  The transparent substrate 11 is not particularly limited as long as it is a substrate transparent to visible light, and the same transparent substrate used for a general color filter can be used. Specifically, a rigid material such as quartz glass, Pyrex (registered trademark) glass, or synthetic quartz, or a transparent flexible material having flexibility such as a transparent resin film or an optical resin plate can be used.

  The colored layer 13 has a red colored layer 13R, a green colored layer 13G, and a blue colored layer 13B, and is usually patterned in a state in which these are sequentially arranged, but the pattern arrangement is particularly limited to that shown in the drawing. It is not something. A known arrangement such as a stripe type, a mosaic type, a triangle type, or a four-pixel arrangement type can be used, and the area of each colored layer can be arbitrarily set. In addition to the above three colors, a transparent colored layer may be included.

  In addition, the number (the number of pixels) of the colored layers 13 which are the pixel portions in the drawings is described as an example only, and is not limited to the illustrated example. As a formation method of the colored layer 13, a formation method of the colored layer 13 in a general color filter, for example, a photolithography method, an inkjet method, a printing method, or the like may be used.

  In the present embodiment, it is usually desirable to form a light shielding portion 12a (sometimes referred to as a so-called black matrix) in the non-pixel area 12, but this is indispensable for exhibiting the effects of the present invention. It does not become. The light shielding portion 12a is usually configured as a lattice-shaped light shielding layer, and is usually configured using a photoresist, a printing ink, or a metal such as chromium containing a black pigment, a binder resin, and a solvent. Examples of black pigments used in printing inks include carbon black and titanium black. Examples of binder resins include benzyl methacrylate: styrene: acrylic acid: 2-hydroxyethyl methacrylate copolymer. The solvent can be selected from various known solvents.

  As a method for forming the light shielding portion 12a, it can be formed by a photolithography method, various pattern printing methods, various plating methods, and the like.

  In the color filter 10 according to the present invention, an overcoat layer 14 is provided so as to cover the colored layer 13 which is the pixel portion described above and the entire light shielding portion 12a located in the non-pixel area 12. The overcoat layer 14 is not an essential component of the present invention. However, by forming the overcoat layer 14, these formation surfaces are formed in forming the metal auxiliary electrode layer and the convex columns described later. This is preferable in that it can be flattened and the colored layer 13 can be protected.

  The material for forming the overcoat layer 14 is not particularly limited, and various types of conventionally used resins may be selected as appropriate, and various printing methods may be used even in the formation method.

  Here, in the non-pixel area 12, more specifically, a metal auxiliary electrode layer 15 is provided on the surface of the overcoat layer 14 located in the non-pixel area 12. Examples of the material used for the metal auxiliary electrode layer 15 include metals such as Cu, Ag, Au, Pt, Al, Cr, and Co, alloys thereof, or MAM (molybdenum / aluminum / neodymium alloy / molybdenum). A multilayer metal film etc. can be mentioned.

  As a method for forming the metal auxiliary electrode layer 15, for example, a method of patterning by photolithography after forming a thin film by vapor deposition or sputtering is preferably used.

  As for the place where the metal auxiliary electrode layer 15 is formed, as shown in FIGS. 1 and 2, it is preferable to arrange the pattern in a line in the non-pixel area 12, but the present invention is not limited to this. It is a position where the supplied current can be conducted to the organic EL element side substrate through the electrode layer formed on the top and side of the convex column, which will be described later. If it is a position where it is not lowered, it can be designed freely.

  In the non-pixel area 12 of the color filter 10 according to the present invention, in addition to the metal auxiliary electrode layer 15, a convex column 17 is formed in at least one location of the non-pixel area 12. An electrode layer 18 is provided on the top and sides of the convex column 17. In the color filter 10 of the present invention, the metal auxiliary electrode layer 15 and the top and side electrode layers 18 of the convex column 17 are electrically connected. Thereby, the current from the organic EL element side substrate 70 having the organic EL layer 83 described later is guided to the color filter 10 side through the top and side electrode layers 18 and the metal auxiliary electrode layer 15 of the convex column 17. By letting it escape, a voltage drop can be prevented. As a result, it is possible to prevent the occurrence of luminance unevenness between the central portion of the screen and the outer peripheral portion of the screen, which is the subject of the present invention.

  Therefore, it is desirable that the convex column 17 is formed at a location where luminance unevenness is likely to occur, particularly near the center of the substrate. In the present embodiment, three convex pillars 17 are formed in the vicinity of the central portion of the cross-sectional view in FIG. 1, but these are merely shown as examples, and the number and arrangement location thereof are not shown. It is not limited to the above. What is necessary is just to set a number, arrangement | positioning place, etc. suitably so that the effect of this invention can be expressed in the optimal state.

  In the case where one or a plurality of convex columns 17 are disposed, the arrangement density D1 of the convex columns disposed in the central portion of the substrate is compared with the arrangement density D2 of the convex columns disposed on the outer peripheral portion of the substrate. In this case, it is desirable to configure so that D1 ≧ D2, preferably D1> D2.

  When obtaining D1 and D2, the size of the substrate corresponding to the size of the screen is divided into three equal parts vertically and horizontally to divide the substrate into 3 × 3 9 divisions. The central area corresponds to the central part of the substrate, and the arrangement density of the convex columns measured here is defined as D1. Then, eight outer areas other than the central area correspond to the outer peripheral portion of the substrate, and the largest value among the arrangement density of the convex columns measured in each of these areas is defined as D2.

  Such a convex column 17 is formed of various resin materials. In the color filter 10 of the present invention, since the conduction is ensured by the top and side electrode layers 18 of the convex column 17, it is not necessary to impart conductivity to the convex column 17 itself. The degree of freedom in material design can be improved, and it is not necessary to mix a conductive material into the convex column 17, so that the strength is not lowered. In addition, you may provide electroconductivity to the said convex column 17 itself.

  The shape of the convex column 17 is not particularly limited. However, as shown in the drawing, it is desirable that the convex column 17 has a tapered shape in which the diameter gradually decreases from the base side to the top. This is for facilitating integration with the organic EL element side substrate 70 having an organic EL layer, as will be described later. Specific examples of the shape of the convex column include a truncated cone having a truncated cone shape as illustrated, a cylinder, a triangular frustum, a square frustum, and the like. The width of the base that is the base of the convex column 17 is about 8 to 100 μm, the width of the top is about 3 to 95 μm, and the height is about 2.5 to 25 μm. The taper angle from the base side to the top is about 30 to 89 °.

  Here, in the color filter 10 of the present invention, the barrier layer 19 is formed on the outermost surface in at least a part of other regions except for the electrode layer 18 provided on the top of the convex column 17. In the color filter 10 shown in FIGS. 1 to 3, the barrier layer 19 is formed over the entire other region except for the electrode layer 18 provided on the top of the convex column 17. Is formed. By forming such a barrier layer 19, it is possible to effectively prevent various components that cause deterioration in the performance of the organic electroluminescence display device from various layers constituting the color filter. it can. Specifically, for example, outgas that can be generated from the colored layers 13 and the hard coat layer 14 can be prevented, and colorants that can be eluted from the colored layer 13 can also be prevented.

  The position where such a barrier layer 19 is formed is not particularly limited on the condition that the electrode layer 18 provided on the top of the convex column 17 is excluded. In addition, it may be provided in a portion where various components that cause deterioration of the performance of the organic electroluminescence display device such as outgas and colorant may be generated. As shown in the color filter 10 shown in the figure, it is preferable that all the components that can be generated can be blocked by forming over the entire other region except the electrode layer 18 provided on the top of the convex column 17. .

In the color filter 10 of the present invention, the material of the barrier layer 19 is not particularly limited, and any conventionally known material can be appropriately selected and used regardless of an inorganic material or an organic material. Specifically, examples of the inorganic material include SiO ₂ , SiOx, SiNx, and SiOxNy, and examples of the organic material include various resins mainly composed of a polymer obtained by crosslinking monomers. Can do. Also, the method for forming the barrier layer 19 is not particularly limited, and when an inorganic material is used, a vacuum deposition method such as a sputtering method, an ion plating method, an electron beam (EB) deposition method, a resistance heating method, or the like. An atomic layer epitaxy (ALE) method, a laser ablation method, a chemical vapor deposition (CVD) method, or the like can be used. Among these, from the viewpoint of productivity, a sputtering method, an ion plating method, and a CVD method can be preferably used. On the other hand, when using organic materials, printing method, inkjet method, spin coating method, casting method, dipping method, bar coating method, blade coating method, roll coating method, gravure coating method, flexographic printing method, spray A coating method, a self-assembly method (alternate adsorption method, self-assembled monolayer method), or the like may be used.

  The barrier layer 19 does not necessarily have a single-layer structure, and may have a stacked structure in which a plurality of layers are stacked. A layer made of an inorganic material and a layer made of an organic material may be stacked. .

  The thickness of the barrier layer 19 as a whole is preferably about 10 nm to 100 μm. When the barrier layer is formed from an inorganic material, the thickness is preferably about 10 nm to 200 nm. Is preferably about 0.2 μm to 100 μm.

  The colored layer 13 that is preferably used in the color filter 10 of the present invention will be further described. As described above, in the color filter substrate of the present invention, the colored layer 13 is not an essential structure, and also in the color filter 10 of the present invention, a colored layer is provided on the entire pixel portion. It does not have to be.

  The colored layer 13 including the red colored layer 13R, the green colored layer 13G, and the blue colored layer 13B is provided corresponding to the unit pixel of the organic EL display device 100 (see FIG. 2). The red colored layer 13R, the green colored layer 13G, and the blue colored layer 13B are formed on the substrate after each colorant such as a pigment or dye is dispersed or dissolved in the photosensitive resin. .

  Examples of the colorant used in the red colored layer 13R 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 green colored layer 13G include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindoline. Examples include linone pigments. These pigments or dyes may be used alone or in combination of two or more.

  Examples of the colorant used for the blue colored layer 13B 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.

  Note that the non-pixel area 12 has an intersecting portion where lines in the vertical and horizontal directions intersect, and it is desirable to form the convex column 17 at the intersecting portion of the non-pixel area 12. This is because a space can be provided at the formation position of the convex column 17 and it can be formed in a state where the strength is increased. Further, it can be formed relatively easily and can contribute to an improvement in yield. Depending on the design of the TFT, the formation position of the convex column 17 may not be an intersection.

(Description of organic EL element side substrate 70)
As shown in FIG. 1, the organic EL element side substrate 70 includes a substrate 71 and an organic electroluminescence element 80 including an organic EL layer 83 formed on the substrate 71.

  By integrating and joining the organic EL element side substrate 70 and the color filter 10 as described above, an organic electroluminescence display device 100 as shown in FIG. 2 is formed. When the organic EL element side substrate 70 and the color filter 10 are integrated and joined, the organic electroluminescence element 80 of the organic EL element side substrate 70 and the colored layer 13 of the color filter 10 are arranged to face each other. Is done.

  The organic electroluminescence element 80 includes an organic EL layer 83, a pair of lower surface electrode layers 81 and an upper surface transparent electrode layer 85 arranged so as to sandwich the organic EL layer 83. In addition, an insulating layer 91 is formed around the organic EL layer 83, and the organic EL layer 83 is partitioned by the insulating layer 91, and the lower electrode layer 81 and the upper transparent electrode layer 85 may be in direct contact with each other. Is prevented. Furthermore, a sealing layer 95 for mainly protecting the organic EL layer 83 is formed on the upper transparent electrode layer 85 so as to cover the entire element. The sealing layer 95 is not an essential component for the organic electroluminescence display device 100.

  A through hole 95a is formed on the surface of the sealing layer 95 facing the color filter 10. The through hole 95a can be inserted into the tip of the convex column 17 formed in the color filter 10, and the portion of the electrode layer 18 formed on the top of the convex column 17 and the organic electroluminescence. The upper surface transparent electrode layer 85 of the element 80 is in contact with the element 80 so as to be conductive. It is desirable that the through hole 95a has a tapered shape similar to the tip of the convex column 17 to be inserted, and that the tip of the convex column 17 can be fitted into the through hole 95a. Further, the depth of the through hole 95 a is set to a depth that reaches the upper transparent electrode layer 85. Further, although not shown, a conductive film may be formed on the side surface of the through hole 95a so as to facilitate the conduction between the electrode layer 18 and the upper transparent electrode layer 85. Providing such a through hole 95a is preferable because conduction can be ensured even when the sealing layer 95 is provided.

  The part where the through hole 95a is formed is preferably provided in a part where the organic EL layer does not exist so as not to narrow the light emitting area. For example, as shown in FIGS. 1 and 2, a through hole 95 a may be formed in a gap portion between adjacent organic EL layers 83.

  By adopting the configuration as described above, the current from the organic EL element side substrate 70 having the organic EL layer 83 as described above is applied to the electrode layer 18 formed on the top and side portions of the convex column 17, and the electrode By leading to the color filter 10 side through the metal auxiliary electrode layer 15 electrically connected to the layer 18 and allowing it to escape, it is possible to prevent the voltage drop.

  As shown in the figure, TFTs (Thin Film Transistors) 75 for controlling the current flowing in the organic electroluminescence elements 80 constituting the pixels are arranged and formed on the substrate 71 for each pixel. A gate line, a signal line, and a power supply line (not shown) are connected to this circuit. Such a TFT 75 may be formed by a known method, and an insulating layer 77 is usually formed on the TFT 75. Note that as the insulating layer 77, a material similar to that of the insulating layer 91 described later can be used.

  Hereinafter, each configuration of the organic EL element side substrate 70 will be further described.

Board 71
The substrate 71 used in the present invention is not particularly limited as long as it can support the organic electroluminescence element 80 and the like, and those generally used as a constituent member of an organic EL display device can be used. In addition, since this embodiment is a so-called top emission system in which light is extracted from the color filter 10 side for the organic EL display device, the substrate 71 of the organic EL element side substrate 70 is transparent or opaque. There may be.

Insulating layer 91
As described above, the insulating layer 91 in the present invention is formed to prevent the lower electrode layer 81 and the upper transparent electrode layer 85 from coming into direct contact.

  As a material for forming such an insulating layer 91, for example, a photocurable resin such as a photosensitive polyimide resin or an acrylic resin, a thermosetting resin, an inorganic material, or the like can be used. The pattern of the insulating layer 91 can be generally linear. By forming the insulating layer 91, a pattern having openings such as a matrix shape or a stripe shape can be formed.

  Examples of a method for forming the insulating layer 91 include a method of applying the above-described material and patterning by a photolithography method. Also, a printing method or the like can be used.

Organic EL layer 83
The organic EL layer 83 used in the present invention is configured to have a light emitting layer, particularly preferably a white light emitting layer. Instead of the white light-emitting layer, a red light-emitting layer, a blue light-emitting layer, and a green light-emitting layer may be sequentially provided. Here, a case where a white light-emitting layer that is a more preferable embodiment is provided will be described as an example. .

  The organic EL layer 83 is usually composed of a plurality of organic layers in addition to the light emitting layer, and holes are introduced into a charge injection layer such as a hole injection layer and an electron injection layer, and a white light emitting layer. It can have a charge transport layer such as a hole transport layer for transporting and an electron transport layer for transporting electrons to the white light emitting layer.

White light emitting layer The white light emitting layer used as a suitable light emitting layer in this invention should just be what can light-emit white light. Specifically, such a white light emitting layer has at least blue light (430 nm to 470 nm), green light (470 nm to 600 nm), and red light (600 nm to 700 nm) when a voltage is applied to the organic EL layer 83. ) As long as it has an emission spectrum in the wavelength region. Furthermore, in the emission spectrum, the ratio of the maximum emission intensity of the green light (470 nm to 600 nm) peak to the maximum emission intensity of the blue light (430 nm to 470 nm) peak (the maximum emission intensity of the green light peak / the maximum of the blue light peak is high intensity). ) Is preferably in the range of 0.3 to 0.8, more preferably in the range of 0.3 to 0.7, and particularly in the range of 0.3 to 0.5. Is preferred.

  When the ratio of the maximum emission intensity of the green light peak and the maximum emission intensity of the blue light peak is within the above range, the power consumption reduction effect due to the large transmittance of the blue pattern can be more effectively exhibited. it can. For red light (600 nm to 700 nm), the ratio of the maximum emission intensity of the red light peak to the maximum emission intensity of the blue light peak (maximum emission intensity of the red light peak / maximum emission intensity of the blue light peak) is 0.3. It is preferable to be within the range of -1.0.

  The material constituting such a white light emitting layer is not particularly limited as long as it emits fluorescence or phosphorescence. In addition, the light emitting material may have a hole transport property or an electron transport property. Examples of the light emitting material include a dye material, a metal complex material, and a polymer material.

  Examples of the dye-based material include cyclopentamine derivatives, tetraphenylbutadiene derivatives, triphenylamine derivatives, oxadiazole derivatives, pyrazoloquinoline derivatives, distyrylbenzene derivatives, distyrylarylene derivatives, silole derivatives, thiophene ring compounds, Examples thereof include pyridine ring compounds, perinone derivatives, perylene derivatives, oligothiophene derivatives, trifumanylamine derivatives, oxadiazole dimers, and pyrazoline dimers.

  In addition, the above metal complex materials include an aluminum quinolinol complex, a benzoquinolinol beryllium complex, a benzoxazole zinc complex, a benzothiazole zinc complex, an azomethylzinc complex, a porphyrin zinc complex, and a europium complex, or a central metal, Al, Examples of the metal complex include Zn, Be, and the like, or rare earth metals such as Tb, Eu, and Dy, and the ligand includes oxadiazole, thiadiazole, phenylpyridine, phenylbenzimidazole, and a quinoline structure. .

  Examples of the polymer material include polyparaphenylene vinylene derivatives, polythiophene derivatives, polyparaphenylene derivatives, polysilane derivatives, polyacetylene derivatives, and the like, polyfluorene derivatives, polyvinylcarbazole derivatives, and the above-described dye materials and metal complexes. Examples include polymerized system materials.

  Examples of the method for forming the white light emitting layer include a vapor deposition method, a printing method, an inkjet method, a spin coating method, a casting method, a dipping method, a bar coating method, a blade coating method, a roll coating method, a gravure coating method, and a flexographic method. Examples thereof include a printing method, a spray coating method, and a self-assembly method (alternate adsorption method, self-assembled monolayer method). Among these, it is particularly preferable to use a vapor deposition method, a spin coating method, and an ink jet method.

  The thickness of the white light emitting layer used in the present invention is usually about 5 nm to 5 μm.

Hole injection layer In the present invention, a hole injection layer may be formed between the white light-emitting layer and the anode (the lower electrode layer 81 or the upper transparent electrode layer 85). By providing the hole injection layer, the injection of holes into the white light emitting layer is stabilized, and the light emission efficiency can be increased.

  As a material for forming the hole injection layer used in the present invention, a material generally used for a hole injection layer of an organic EL element can be used. The material for forming the hole injection layer may be any material that has either a hole injection property or an electron barrier property.

  Specifically, the hole injection layer forming material includes triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazoles. Examples include derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, polysilane-based, aniline-based copolymers, and conductive polymer oligomers such as thiophene oligomers. Furthermore, examples of the material for forming the hole injection layer include porphyrin compounds, aromatic tertiary amine compounds, and styrylamine compounds.

  The thickness of the hole injection layer made of such a material is usually about 5 nm to 1 μm.

Electron Injection Layer In the present invention, an electron injection layer may be formed between the white light emitting layer and the cathode (upper surface transparent electrode layer 85 or lower electrode layer 81). This is because by providing the electron injection layer, the injection of electrons into the white light emitting layer is stabilized, and the luminous efficiency can be increased.

  Examples of the material for forming the electron injection layer used in the present invention include heterocyclic tetracarboxylic anhydrides such as nitro-substituted fluorene derivatives, anthraquinodimethane derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, naphthaleneperylene, carbodiimides, Fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxadiazole derivatives, thiazole derivatives in which the oxygen atom of the oxadiazole ring of the oxadiazole derivative is replaced with a sulfur atom, quinoxaline ring known as an electron withdrawing group Examples thereof include quinoxaline derivatives having bismuth, metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum, phthalocyanines, metal phthalocyanines, and distyrylpyrazine derivatives.

  The film thickness of the electron injection layer made of such a material is usually about 5 nm to 1 μm.

Upper transparent electrode layer 85
The upper transparent electrode layer 85 in the present invention is provided to apply a voltage to the organic EL layer 83 sandwiched between the lower electrode layer 81 described in detail later and cause the white light emitting layer to emit light.

  Moreover, since the upper surface transparent electrode layer 85 transmits the light generated in the white light emitting layer to the color filter side for the organic EL display device, the organic EL layer 83 and the organic EL layer as shown in FIG. The organic EL display device color filter 10 located above 83 is disposed.

  Examples of the material for forming the upper transparent electrode layer 85 used in the present invention include metal oxides having transparency and conductivity. Examples of such metal oxides include indium tin oxide (ITO), indium oxide, zinc oxide, and stannic oxide.

  The film thickness of the upper transparent electrode layer 85 made of such a material is usually about 100 nm to 300 nm.

  As a method for forming the upper transparent electrode layer 85, for example, a method of patterning by a photolithography method after forming a thin film by a vapor deposition method or a sputtering method is suitably used.

Lower electrode layer 81
The lower electrode layer 81 in the present invention is disposed between the organic EL layer 83 and the substrate 71 located below the organic EL layer 83 as shown in FIG. The lower electrode layer 81 forms the other electrode for causing the white light emitting layer to emit light, and is configured as an electrode having a charge opposite to that of the upper transparent electrode layer 85 described above.

Examples of the material for forming the lower surface electrode layer 81 include metals, alloys, and mixtures thereof having a work function as small as about 4 eV or less. Specifically, sodium, sodium-potassium alloy, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide (Al ₂ O ₃ ) mixture, indium, Examples include lithium / aluminum mixtures and rare earth metals. More preferable examples include a magnesium / silver mixture, a magnesium / aluminum mixture, a magnesium / indium mixture, an aluminum / aluminum oxide (Al ₂ O ₃ ) mixture, and a lithium / aluminum mixture.

  The lower electrode layer 81 preferably has a sheet resistance of several Ω / cm or less. The film thickness of the lower electrode layer 81 is normally about 10 nm to 1 μm.

  As a method for forming the lower electrode layer 81, for example, a method of patterning by a photolithography method after forming a thin film by an evaporation method or a sputtering method is suitably used. Note that a TFT (Thin Film Transistor) 75 for controlling a current flowing through the organic EL element is connected to the lower electrode layer 81.

Sealing layer 95
The sealing layer 95 having the above-described through hole 95a is formed on the upper transparent electrode layer 85, that is, between the upper transparent electrode layer 85 and the color filter 10 for the organic EL display device. The sealing layer 95 is usually provided as a protective layer that blocks water vapor and oxygen from reaching the organic EL layer 83.

  The sealing layer 95 is not particularly limited as long as it can exhibit barrier properties against water vapor and oxygen and is transparent. For example, a transparent inorganic film, a transparent resin film, or an organic-inorganic hybrid film Etc. are used. Among these, a transparent inorganic film is preferable because of its high barrier property.

  Examples of a material for forming a transparent inorganic film panel suitably used as the sealing layer 95 include oxides such as aluminum oxide, silicon oxide, and magnesium oxide; nitrides such as silicon nitride; nitride oxides such as silicon nitride oxide; Etc. are used. In particular, silicon nitride oxide is preferable because pinholes hardly occur and gas barrier properties are high.

  The sealing layer 95 may be a single layer or a multilayer. For example, when the sealing layer 95 is a multilayer in which a plurality of silicon nitride oxide films are stacked, the barrier property can be further improved. Moreover, when the sealing layer 95 is a multilayer, you may use a different material for each layer, respectively.

  The film thickness of the sealing layer 95 may be appropriately determined according to the type of the forming material of the sealing layer 95 to be used. Usually, it is about 5 nm to 5 μm. If the sealing layer 95 is too thin, the barrier property tends to be insufficient, and if the sealing layer 95 is too thick, a phenomenon such as cracking due to the film stress of the thin film tends to occur. Occurs.

  When the sealing layer 95 is a transparent inorganic film, the method for forming the transparent inorganic film is not particularly limited as long as it is a film forming method that can be formed in a vacuum state. Examples thereof include a vacuum deposition method such as a coating method, an electron beam (EB) deposition method and a resistance heating method, an atomic layer epitaxy (ALE) method, a laser ablation method, and a chemical vapor deposition (CVD) method. Among these, the sputtering method, the ion plating method, and the CVD method are preferably used from the viewpoint of productivity.

  As a method for forming the above-described through-hole 95a at a predetermined portion of the sealing layer 95, for example, a method of patterning by a photolithography method after forming a thin film of the sealing layer 95 is preferably used.

  An organic EL display device 100 as shown in FIG. 2 is formed by integrating and joining the organic EL element side substrate 70 having such a configuration and the color filter 10. That is, when the organic EL element side substrate 70 and the color filter 10 are integrated and joined, the through hole 95a formed in the sealing layer 95 of the organic EL element side substrate 70 and the non-pixel area of the color filter 10 are provided. After aligning the tip of the convex column 17 formed, the tip of the convex column 17 is fitted into the through-hole 95a of the sealing layer 95, and the tip 17a of the convex column is formed. The portion of the electrode layer 18 and the upper transparent electrode layer 85 are brought into contact with each other so as to be integrated. Thereafter, the gap portion between the sealing layer 95 and the electrode layer 18 is filled with an adhesive layer 99 as shown in FIG. 2, and the color filter 10 and the organic EL element side substrate 70 are integrated and joined. As shown, an organic electroluminescence display device 100 as shown in FIG. 2 is formed.

  The adhesive layer 99 is not particularly limited as long as it is transparent, has adhesive force, and has curability. As a material for forming such an adhesive layer 99, for example, a thermosetting adhesive or a photocurable adhesive can be cited as a preferred example. Usually, a type that does not require a solvent is preferable. Also, a film-like adhesive sheet type may be used. Specific examples include epoxy-based, acrylic-based, polyimide-based, and synthetic rubber-based adhesives and adhesive sheets.

  Further, the gap between the sealing layer 95 and the electrode layer 18 is left without providing the adhesive layer 99, and the organic EL element side substrate 70 and the organic EL display are kept in an inert gas atmosphere such as nitrogen. The peripheral portion of the device color filter 10 may be sealed with a sealing agent, and a water capturing agent such as barium oxide may be provided inside the hollow.

  For example, as shown in FIG. 2, the wiring form from the power source is a wiring 201 from one pole of the power source P to each TFT 75, and a wiring 202-203 from the other pole of the power source to the upper transparent electrode layer 85. And wirings 202-204 extending from the other pole of the power source to the metal auxiliary electrode layer 15. The wiring circuit for causing the organic EL element 80 to emit light is the wiring 201 and the wiring 202-203, and the wiring circuit for releasing the current on the TFT side to the metal auxiliary electrode layer 15 on the color filter side to prevent a voltage drop is wiring. 201 and wirings 204-202.

  By adopting such a configuration, the current from the organic EL element side substrate 70 having the organic EL layer 83 as described above is applied to the electrode layer 18 formed on the top and side portions of the convex column 17 and the metal auxiliary. By leading to the color filter 10 side through the electrode layer 15 and allowing it to escape, it is possible to prevent the voltage drop.

In addition, in said embodiment, as a suitable aspect, the color filter provided with the red colored layer 13R, the green colored layer 13G, and the blue colored layer 13B is used for the white light emitted from the organic EL layer provided with the white light emitting layer. The method of using and emitting light in three colors of RGB has been described. However, the present invention is not limited to this method. For example, an organic EL layer that emits blue light has three colors of RGB using a color conversion layer (CCM) that absorbs blue light and emits light in green and red colors. The configuration of the main part of the present invention can be applied to either a so-called blue EL color conversion (CCM) full-color system that emits light or a so-called RGB light-emitting layer juxtaposed full-color system that coats organic EL elements that emit RGB light for each pixel. .

DESCRIPTION OF SYMBOLS 10 ... Color filter 11 for organic EL display devices ... Transparent substrate 12 ... Non-pixel area 13 ... Colored layer 15 ... Metal auxiliary electrode layer 17 ... Convex column 18 ... Electrode layer 19 ... Barrier layer 70 ... Organic EL element side substrate 100 ... Organic EL display device

Claims (6)

A transparent substrate, a pixel portion formed on the transparent substrate, and a non-pixel area formed around the pixel portion,
In the non-pixel area, a metal auxiliary electrode layer is provided, and a convex column is formed in at least one place of the non-pixel area,
An electrode layer is provided on the top and sides of the convex column,
The metal auxiliary electrode layer of the non-pixel area and the electrode layer of the convex column are conductive,
Except for the electrode layer provided at the top of the convex column, a barrier layer is formed on the outermost surface in at least a part of the other region ,
The said barrier layer is comprised from the inorganic material , The board | substrate for color filters used for the organic electroluminescent display apparatus characterized by the above-mentioned .   The color used in the organic electroluminescence display device according to claim 1, wherein the non-pixel area has an intersection where a plurality of lines intersect, and the convex column is formed at the intersection. Filter substrate.   3. The substrate for a color filter used in an organic electroluminescence display device according to claim 1, wherein the convex column has a tapered shape whose diameter gradually decreases from the base side to the top. .   When the arrangement density D1 of the convex columns arranged in the central part of the substrate and the arrangement density D2 of the convex columns arranged in the outer peripheral part of the substrate are compared, D1> D2. The substrate for color filters used for the organic electroluminescent display apparatus as described in any one of Claims 1-3. A transparent substrate; a pixel portion formed on the transparent substrate; and a non-pixel area formed around the pixel portion. A metal auxiliary electrode layer is provided in the non-pixel area. In addition, convex columns are formed in at least one location of the non-pixel area, and an electrode layer is provided on the top and sides of the convex column, and the metal auxiliary electrode layer of the non-pixel area and An organic electro-conductive layer that is electrically connected to the electrode layer of the convex column and has a barrier layer formed on the outermost surface of at least a part of the other region except for the electrode layer provided on the top of the convex column. A substrate for a color filter used in a luminescence display device;
A colored layer formed on a pixel portion of the color filter substrate;
A color filter for an organic electroluminescence display device, comprising: A transparent substrate; a pixel portion formed on the transparent substrate; and a non-pixel area formed around the pixel portion. A metal auxiliary electrode layer is provided in the non-pixel area. In addition, convex columns are formed in at least one location of the non-pixel area, and an electrode layer is provided on the top and sides of the convex column, and the metal auxiliary electrode layer of the non-pixel area and The electrode layer of the convex column is conductive, except for the electrode layer provided on the top of the convex column, a barrier layer is formed on the outermost surface of at least a part of the other region , barrier layer of the organic electroluminescent having the substrate for a color filter used in the organic electroluminescence display device which is composed of an inorganic material, and a colored layer formed on the pixel portion of the substrate for the color filter Tsu And a color filter for Nsu display device,
An organic electroluminescence display device comprising: a substrate and an organic electroluminescence element including an organic EL layer formed on the substrate; and an organic EL element side substrate comprising:
The color filter and the organic EL element side substrate are arranged so that the colored layer and the organic electroluminescence element face each other.
The organic electroluminescence element includes the organic EL layer, a pair of lower electrode layers and an upper transparent electrode layer disposed so as to sandwich the organic EL layer,
An organic electroluminescence display device, wherein a portion of the metal electrode layer formed on the top of the convex column and the upper transparent electrode layer are in contact with each other so as to be conductive.

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