JP4826806B2 - LIGHT EMITTING DEVICE AND ELECTRONIC DEVICE - Google Patents

Description

  The present invention relates to, for example, a liquid crystal device, an organic EL (Electro-Luminescence) device, a light emitting device represented by an inorganic EL device, and an electronic apparatus equipped with the light emitting device.

Conventionally, in a light-emitting device such as an organic electroluminescence (hereinafter abbreviated as organic EL) device, a light-emitting layer formed of a plurality of circuit elements, an anode, a hole injection layer, an electro-optical material such as an EL material on a substrate. Some have a configuration in which cathodes and the like are stacked and sealed with a sealing substrate between them. Specifically, on a transparent substrate such as a glass substrate, an anode made of a transparent conductive material such as indium tin oxide (ITO), tin oxide (SnO ₂ ), a polythiophene derivative (hereinafter referred to as PEDOT) (Abbreviated), a hole injection layer made of a doped body, a light emitting layer made of a light emitting material such as polyfluorene, and a cathode made of a metal material or metal compound having a low work function such as Ca. .

  In such an organic EL device, holes injected from the anode side and electrons injected from the cathode side recombine in the light emitting layer having fluorescence ability and emit light when deactivated from the excited state. The phenomenon is used.

  Further, as a structure for extracting emitted light to the observer side, for example, a structure called bottom emission is known, and the structure is configured to extract emitted light from the substrate side on which circuit elements are formed (for example, , See Patent Document 1). In recent years, there has been a great demand for large-sized, high-definition and high-brightness organic EL devices, and a top-emission type organic EL device advantageous for realizing a high aperture ratio and high efficiency of light-emitting elements. Research and development is actively conducted (for example, see Patent Document 2).

US Pat. No. 4,356,429 International Publication No. WO98 / 36407 Pamphlet

  In the top emission type organic EL device, it is necessary to make the upper electrode on the light extraction side transparent, and in the configuration described in Patent Document 1, an ITO (Indium Tin Oxide) film or an upper electrode is formed on the upper electrode. A laminated film of a thin Al film and an ITO film is used. However, when such a configuration is adopted, a transparent conductive film typified by ITO has a higher resistance than a metal film typified by Al. Therefore, a voltage drop caused by the resistance of the transparent conductive film itself causes a drop in the light emitting element. Uneven brightness occurs.

  Further, when the upper electrode made of at least a metal film typified by Al is formed, there is a problem that sufficient transparency cannot be obtained and the light extraction efficiency is lowered.

  Further, most of the top emission structure is a technique for making the electrode transparent, so that sufficient transparency cannot be obtained, or even if transparency is obtained, there are problems such as poor reliability. Further, the conventional organic EL device has a problem that about 20% cannot be extracted because the emitted light generated in the light emitting layer is directly extracted to the outside.

  Further, when a transparent conductive material made of a metal oxide such as ITO is laminated on an electron injection layer having a low work function containing an alkali metal such as Li, Na, or an alkaline earth metal such as Be, Mg, or Ca, the electron injection layer There is also a problem that is easily damaged.

  On the other hand, in the bottom emission type organic EL device, since various wirings are arranged at positions where the emitted light is blocked, there is a problem that such wirings reduce the extraction efficiency of the emitted light.

  The present invention has been devised in view of the above-described problems, and can improve the extraction efficiency of emitted light, obtain a uniform display brightness within the display surface, and have high reliability, thereby increasing the screen size. Even in such a case, it is an object to provide a light emitting device and an electronic apparatus that can suppress a decrease in extraction efficiency of emitted light caused by various wiring structures.

In order to solve the above problems, a light-emitting device according to an embodiment of the present invention includes a light-reflective first electrode on one surface of a substrate, a functional layer including a light-emitting layer, and a light-reflective second. A light emitting device comprising a plurality of electrodes stacked in sequence, and a wiring provided between the first electrode and the substrate, wherein the light emitting layer is opposite to the wiring. The wiring has a concavo-convex surface, and the wiring and the first electrode have an opening at a position corresponding to the convex portion of the concavo-convex surface in plan view. The light-emitting device according to an embodiment of the present invention includes a light-transmitting first electrode, a functional layer including a light-emitting layer, and a light-reflective second electrode sequentially stacked on one surface of the substrate. A light-emitting device, and a wiring provided between the first electrode and the substrate, wherein the light-emitting layer has an uneven surface on a surface opposite to the wiring. The wiring has an opening at a position corresponding to the convex portion of the uneven surface in a plan view.
In order to solve the above problems, a light-emitting device according to an embodiment of the present invention includes a first electrode, a second electrode, and a gap between the first electrode and the second electrode on a substrate. A light emitting region provided with a light emitting element, and a wiring provided between the first electrode and the substrate, and the wiring and the light emission in a plan view. At least one part overlaps with the region, and the wiring has an opening in a portion overlapping with the light emitting region.
In order to solve the above problems, a light-emitting device according to an embodiment of the present invention includes a first electrode, a second electrode, and a gap between the first electrode and the second electrode on a substrate. A light emitting region provided with a light emitting element, a first wiring provided between the first electrode and the substrate, and a second wiring. The first electrode has a light transmitting property, and the second electrode, the first wiring, and the second wiring have a light reflecting property, and the first wiring in a plan view. The second wiring and the light emitting region are at least partially overlapped, and the width of each of the first wiring and the second wiring is smaller than the width of the light emitting region. .
In order to solve the above problems, a light-emitting device according to an embodiment of the present invention includes a first electrode, a second electrode, and a gap between the first electrode and the second electrode on a substrate. A light emitting region provided with a light emitting element, and a wiring provided between the first electrode and the base, wherein the first electrode transmits light. The second electrode and the wiring have light reflectivity, and the wiring and the light emitting region overlap at least partly in plan view, and the wiring is connected to the light emitting region. The overlapping portion has an opening, the light emitting layer has an uneven surface on a surface opposite to the wiring, and the opening of the wiring is in a position corresponding to the convex portion of the uneven surface in a plan view. It is provided.
In order to solve the above problems, a light-emitting device according to an embodiment of the present invention includes a first electrode, a second electrode, and a gap between the first electrode and the second electrode on a substrate. A light-emitting region provided with a light-emitting element, and a wiring provided between the first electrode and the base, wherein the first electrode The second electrode and the wiring have light reflectivity, and at least a part of the wiring and the light emitting region overlap in plan view, and the width of the wiring is It is smaller than the width of the light emitting region, the light emitting layer has an uneven surface on the surface opposite to the wiring, and the convex portion of the uneven surface is provided at a position that does not overlap the wiring in plan view. It is characterized by.
A light emitting device according to an embodiment of the present invention includes a first electrode, a second electrode, and a light emitting layer provided between the first electrode and the second electrode on a substrate. And a wiring provided between the first electrode and the substrate, and the wiring and the light emitting region are at least part of the wiring in a plan view. And the width of the wiring is smaller than the width of the light emitting region.
In the light-emitting device according to an embodiment of the present invention, the first electrode has a light-transmitting property, the second electrode and the wiring have a light-reflecting property, and light is emitted from the light-emitting layer. The light is emitted from the first electrode side.
In the light emitting device according to one embodiment of the present invention, the first electrode, the second electrode, and the wiring have light reflectivity, and the first electrode has an opening of the wiring. And has an opening in a portion overlapping with the plane.
In the light-emitting device according to an embodiment of the present invention, the first electrode, the second electrode, and the wiring have light reflectivity, and the first electrode is planar with the wiring. It has an opening part in the part which does not overlap with.
In the light-emitting device according to an embodiment of the present invention, the wiring is electrically connected to the first electrode.
In the light emitting device according to an embodiment of the present invention, the wiring is a power supply line that supplies a current to the light emitting element.
In the light-emitting device according to an embodiment of the present invention, the light-emitting layer has a concavo-convex surface on a surface opposite to the wiring, and the convex portion of the concavo-convex surface at a position not overlapping the wiring in a plan view. Is provided.
In the light emitting device according to an embodiment of the present invention, a light absorption layer is provided between the base and the wiring in a region where the base and the wiring overlap in a plan view. And
In addition, a light emitting device according to an embodiment of the present invention includes a partition formed on a base so as to surround the light emitting region, and the partition and the partition between the base and the partition in plan view. It has a reflection part that reflects light emitted from the light emitting layer toward the substrate in at least a part of the overlapping region.

  In the light emitting device according to an embodiment of the present invention, the wiring has light reflectivity.

  The light-emitting device according to an embodiment of the present invention is characterized in that an angle formed by a vertical direction of the substrate and the uneven surface at an end of the uneven surface is 30 ° or more and 50 ° or less. To do.

  In the light-emitting device according to an embodiment of the present invention, a light absorption layer is formed in a region of the substrate where the substrate and the wiring overlap in plan view.

  The light-emitting device according to an embodiment of the present invention includes a partition formed so as to surround the periphery of the first electrode, and at least part of a region of the substrate that overlaps the partition in plan view. Has a reflection part that reflects light emitted from the light emitting layer toward the substrate.

  In the light-emitting device according to an embodiment of the present invention, the wiring has a plurality of divided portions in a region overlapping the light-emitting layer in plan view.

  Moreover, the light emitting device according to an embodiment of the present invention is characterized in that the functional layer includes an organic electroluminescent material.

  An electronic apparatus according to an embodiment of the present invention includes the light emitting device described above.

  According to a reference example of the present invention, there is provided a light-emitting device including a light-emitting element in which a first electrode, a functional layer including a light-emitting layer, and a second electrode are sequentially stacked on a substrate. The first electrode and the second electrode are light-reflective, and the second electrode has an opening that transmits light from the light-emitting layer. Providing equipment.

  In the present invention, the term “light emitting device” is a generic term that includes a device that generates a light emission phenomenon by converting electrical energy into optical energy.

  Moreover, the opening part in this invention means the site | part through which the light from a light emitting layer permeate | transmits, and the part in which the electrode is not formed and the hole part formed in the electrode are meant. In addition, when a transparent electrode and a non-transparent electrode are laminated, light is transmitted to the hole portion formed in the non-transparent electrode through the transparent electrode. The hole portion also has a meaning as an opening.

  According to the present invention, the light generated in the light emitting layer by supplying power to the functional layer sandwiched between the first electrode and the second electrode is transmitted between the first electrode and the second electrode. And can be propagated in the surface direction of the functional layer while being reflected and taken out to the outside of the functional layer at the opening of the second electrode.

  Further, according to the reference example of the present invention, when a transparent conductive material made of a metal oxide is not used as the second electrode, an alkali metal such as Li or Na, or an alkaline earth such as Be, Mg, or Ca Since a material including a metal having a low work function can be used for the electron injection layer, electrons can be efficiently injected into the light emitting layer, and the luminance of light from the light emitting element can be improved.

  Further, in this light emitting device, the light generated in the light emitting layer is emitted without passing through the transparent conductive film, so that the generated light is extracted with high efficiency with almost no attenuation, and a bright display can be realized. .

  In addition, according to the reference example of the present invention, the second electrode has light reflectivity, and can use a metal film having excellent reliability and low resistance, so that the resistance of the second electrode itself can be reduced. The luminance unevenness of the light emitting element due to the voltage drop due to the voltage drop can be reduced. Further, higher reliability can be obtained as compared with the conventional light emitting device in which the electrode is formed of a transparent conductive material.

  According to the reference example of the present invention, it is preferable that the first electrode has an inclined surface portion that is inclined with respect to the substrate surface in a region where the second electrode is not formed.

  In this way, in the non-formation region of the second electrode, which is the region where the light propagated inside the functional layer is extracted to the outside, a large amount is provided on the front side (substantially normal direction of the substrate) of the light emitting device. Light can be extracted.

  That is, it is possible to provide a light emitting device capable of obtaining a display with high luminance in the viewer direction. Moreover, it is preferable that the inclination angle of the inclined surface portion is approximately 45 ° with respect to the base surface. In this way, the light propagating through the functional layer and reflected by the inclined surface portion can be emitted in the normal direction of the substrate, and the brightest display can be obtained in front of the light emitting device.

  Further, according to the reference example of the present invention, it is preferable that a partition wall surrounding the light emitting element is provided, and the first electrode is extended to an inner wall surface of the partition wall.

  If it does in this way, the 1st electrode extended on the inner wall surface of the above-mentioned partition will be arranged so that it may stand up from the electrode surface on the above-mentioned inner wall surface. As a result, the light propagating through the functional layer is reflected at the rising portion of the first electrode, so that it is output with high directivity to the front side of the apparatus, thereby obtaining a high-luminance display in the viewer direction. Be able to.

  Further, according to the reference example of the present invention, it further includes an internal partition that planarly partitions a region surrounded by the partition, and the first electrode extends on an inner wall surface of the internal partition. You can also

  Further, according to the reference example of the present invention, the light generated in the region where the first electrode and the second electrode are arranged to face each other is propagated in the surface direction of the functional layer and the second electrode is not formed. Since the area is extracted to the outside, if the propagation distance inside the functional layer is increased, the amount of attenuation may be increased, but the efficiency may be reduced. Therefore, by dividing the light emitting element by the internal partition wall as in the present invention, the opposing region (light emitting region) of both the electrodes can be reduced, and the attenuation amount inside the functional layer can be suppressed. Further, since the first electrode is formed up to the inner wall surface of the inner partition wall, light can be extracted with high efficiency in a specific direction by the first electrode formed on the inner wall surface. The present invention is particularly suitable for a large screen light emitting device in which the light emitting element has a relatively large flat area.

  According to the reference example of the present invention, it is preferable that the inner wall surface of the partition wall or the inner partition wall has an inclination angle of about 45 ° with respect to the base surface.

  In this case, the inclination angle of the first electrode formed on the inner wall surface can be set to about 45 °, and light propagating through the functional layer is emitted with high efficiency in the front direction of the light emitting device. be able to.

  Further, according to the reference example of the present invention, it is preferable that an antireflection means is provided on the outer surface side of the second electrode.

  In this way, it is possible to prevent external light from being reflected by the second electrode disposed on the display surface of the light emitting device, and thus it is possible to provide a light emitting device with excellent visibility.

  According to a reference example of the present invention, the second cathode includes a transparent conductive film having light transmittance and an auxiliary electrode for assisting the conductivity of the transparent conductive film. It is preferable that the opening for transmitting light from the light emitting layer is formed.

  Here, the transparent conductive film is preferably formed on the entire surface of the functional layer. Moreover, it is preferable that the auxiliary electrode is formed on the surface of the transparent conductive film. Moreover, it is preferable that the auxiliary electrode has light reflectivity.

  In such a light emitting device, when power is supplied to the functional layer sandwiched between the first electrode and the second cathode, power is supplied between the transparent conductive film and the first electrode. In addition, the auxiliary electrode assists the conductivity of the transparent conductive film, and power is supplied to the functional layer. In the light emitting layer to which power is supplied in this way, the light emitting light can be generated, and the light emitting light is multi-reflected between the first electrode and the auxiliary electrode while the functional layer is reflected. In addition, the transparent conductive film can be propagated in the surface direction and taken out of the functional layer through the opening of the auxiliary electrode. That is, in this light-emitting device, the auxiliary electrode improves the conductivity of the transparent conductive film, so that power can be efficiently supplied to the functional layer, and the generated light is extracted with high efficiency, realizing a bright display. can do. Further, since the transparent conductive film is formed on the entire surface of the functional layer, the contact area with the functional layer can be increased as compared with the case where the electrode is formed in contact with a part of the functional layer. . Thereby, the light emission area can be increased as compared with the case where the electrode is formed on a part of the functional layer.

  Therefore, as described above, the auxiliary electrode can enhance the conductivity by assisting the conductivity of the transparent conductive film, and the light emission area can be increased, so that further improvement of the light emission efficiency can be realized. .

  Further, according to a reference example of the present invention, a light emitting device including a pair of opposed electrodes and a functional layer including a light emitting layer sandwiched between the electrodes on the substrate, the substrate and the substrate Between the light emitting layers, wiring that blocks the display area of the substrate is provided, and a reflective surface having light reflectivity is formed on the wiring on the side of the light emitting layer, and the side of the light emitting layer is formed on the side of the wiring. An opening through which the emitted light passes is formed.

  Here, the wiring means various wiring such as wiring of a switching element such as a TFT, a power supply line for supplying a current to the light emitting layer, and a capacitor line for holding a predetermined potential.

  In such a light emitting device, when the light emitting layer emits light, the emitted light may be emitted directly from the opening to the outside of the substrate, or the emitted light may collide with the wiring. Here, since the reflective surface is formed on the wiring, the emitted light is reflected by the reflective surface of the wiring and the electrode and is emitted from the opening, or after being propagated in the horizontal direction of the light emitting layer by multiple reflection. Emanating from the part.

  Therefore, even when the wiring is formed so as to block the display area, the emission light is reflected and emitted from the opening, so that the emission light extraction efficiency can be improved. In addition, when the screen of the light emitting device is enlarged, the line width is increased to reduce the wiring resistance, and the display area may be blocked, leading to a reduction in the efficiency of extracting emitted light. By adopting the configuration, it is possible to suppress a decrease in extraction efficiency of emitted light. Accordingly, since the degree of freedom of the wiring structure and wiring pattern is increased, the TFT wiring and the power supply line can be arranged at a desired position, and the screen can be easily enlarged.

  Further, since the emitted light is emitted from the opening formed in the side portion of the wiring, for example, the emitted light can be emitted from the desired opening by forming the wiring in a desired pattern. In addition, if the intensity of the emitted light is biased due to the shape of the light emitting layer or electrode, the wiring pattern is positively adjusted so that the emitted light can be extracted efficiently, and the opening is positioned at a desired position. By forming, the extraction efficiency of emitted light can be further improved.

  The above configuration is particularly effective in a so-called bottom emission structure in which emitted light is extracted from the substrate side provided with TFTs and various wirings.

  Further, the light emitting device is characterized in that the wiring is branched into a plurality of numbers with respect to the light emitting layer.

  Thus, a plurality of branch lines are formed by branching a plurality of lines, and a plurality of openings are formed between the branch lines. Therefore, the emitted light can be emitted from the opening adjacent to the branch wiring. Here, by forming the branch wiring in a desired pattern, emitted light can be emitted from a desired opening. If the intensity of the emitted light is uneven due to the shape of the light emitting layer or electrode, the wiring is actively branched to form the opening at a desired position so that the emitted light can be extracted efficiently. Thereby, the extraction efficiency of emitted light can be further improved. Moreover, since multiple reflection can be avoided, attenuation of the emitted light resulting from the multiple reflection can be suppressed.

  Further, according to a reference example of the present invention, the reflection surface has a light scattering property of scattering emitted light.

  Thus, since the reflecting surface has light scattering properties, the emitted light that collides with the reflecting surface can be scattered. Accordingly, it is possible to prevent a deviation in the reflection direction of the emitted light.

  Moreover, it is preferable that the light-scattering property said here does not reflect emitted light to the light emitting layer side. In this way, since multiple reflection can be avoided, attenuation of the emitted light due to the multiple reflection can be suppressed.

  According to a reference example of the present invention, one of the electrodes sandwiching the light emitting layer has light reflectivity.

  Here, “one of the electrodes sandwiching the light emitting layer” is preferably an electrode located on the side opposite to the wiring as viewed from the light emitting layer.

  As described above, since the electrode has light reflectivity, emitted light emitted from the light emitting layer toward the electrode and emitted light reflected by the wiring can be reflected toward the wiring or the opening.

  According to the reference example of the present invention, the light emitting layer has an uneven surface on the side opposite to the wiring.

  Thus, when a light emitting layer has an uneven surface, emitted light can be emitted according to the shape of the uneven surface. Further, by providing the light-reflecting electrode so as to cover the uneven surface, emitted light can be emitted in the normal direction of the uneven surface.

  Further, by forming the irregular surface with a desired shape, it becomes possible to collect the emitted light at a desired position, and the emission intensity can be partially increased. In addition, the emission efficiency of emitted light can be further promoted by emitting such emitted light directly from the opening or reflecting and emitting the emitted light.

  According to a reference example of the present invention, an angle formed between the vertical direction of the substrate and the uneven surface at the end of the uneven surface is 30 ° or more and 50 ° or less.

  If it does in this way, the effect which has said uneven surface can be acquired favorably.

  The light emitting device is characterized in that the top or bottom of the uneven surface corresponds to the opening.

  If it does in this way, the effect which has said uneven surface can be acquired favorably.

  The light emitting device is characterized in that a reflective portion having light reflectivity is formed on the substrate.

  By providing the reflective portion on the substrate in this manner, the emitted light emitted from the opening can be reliably emitted to the observer side. Therefore, the above effect can be further promoted.

  According to a reference example of the present invention, a light absorption layer is formed between the substrate and the wiring.

  In this way, reflection of external light from the viewer side is prevented, so that an improvement in contrast can be achieved.

  Moreover, according to the reference example of this invention, the said functional layer can be set as the structure containing the organic electroluminescent material. That is, according to the present invention, a light emitting device including an organic EL element as a light emitting element is provided.

  In addition, a method for manufacturing a light emitting device according to a reference example of the present invention includes a method for manufacturing a light emitting device including a pair of opposed electrodes and a functional layer including a light emitting layer sandwiched between the electrodes on a substrate. The method includes a step of forming a wiring that blocks a display area of the substrate between the substrate and the light emitting layer, and the wiring includes a reflective surface having light reflectivity on the light emitting layer side. It is characterized by being.

  Furthermore, it is preferable that an opening through which the light emitted from the light emitting layer passes is formed on the side of the wiring.

  In this way, even if the wiring is formed so as to block the display area, the emitted light is reflected and emitted from the opening, so that the efficiency of extracting emitted light can be improved. In addition, when the screen of the light emitting device is enlarged, the line width is increased to reduce the wiring resistance, and the display area may be blocked, leading to a reduction in the efficiency of extracting emitted light. By adopting the configuration, it is possible to suppress a decrease in extraction efficiency of emitted light. Accordingly, since the degree of freedom of the wiring structure and wiring pattern is increased, the TFT wiring and the power supply line can be arranged at a desired position, and the screen can be easily enlarged.

  Further, since the emitted light is emitted from the opening formed in the side portion of the wiring, for example, the emitted light can be emitted from the desired opening by forming the wiring in a desired pattern. In addition, if the intensity of the emitted light is biased due to the shape of the light emitting layer or electrode, the wiring pattern is positively adjusted so that the emitted light can be extracted efficiently, and the opening is positioned at a desired position. By forming, the extraction efficiency of emitted light can be further improved.

  The above manufacturing method is particularly effective when manufacturing a light emitting device having a so-called bottom emission structure in which emitted light is extracted from the substrate side provided with TFTs and various wirings.

  Further, in the method for manufacturing a light emitting device according to the reference example of the present invention, a step of forming a partition that separates the plurality of light emitting layers, and a step of forming the light emitting layer adjacent to the partition by a droplet discharge method Further, it is characterized by having.

  Furthermore, it is preferable to perform lyophilic treatment or lyophobic treatment so that the surface of the partition wall is relatively lyophilic or lyophobic.

  In this way, by using the droplet discharge method to discharge the light emitting layer material in the vicinity of the partition wall, the liquid repellency of the partition wall, the lyophilicity of the base, the light emitting layer material at the contact portion between the partition wall and the light emitting layer Due to various factors such as evaporability of the solvent, the contact can be made at a desired angle. Therefore, the above-mentioned uneven surface can be easily formed.

  Next, an electronic apparatus according to a reference example of the present invention includes the above-described light emitting device of the present invention.

  Here, as an electronic device, information processing apparatuses, such as a mobile telephone, a mobile information terminal, a clock, a word processor, a personal computer, etc. can be illustrated, for example.

  Therefore, according to the present invention, since the display unit using the light emitting device described above is provided, a display unit capable of displaying a bright, high image quality, high reliability, high brightness and high contrast image is provided. It becomes an electronic device.

  In addition, the electronic device of the present invention can reduce unevenness in luminance of the light-emitting element, and thus can be suitably used for an electronic device including a display area with a large area of, for example, 20 inches diagonal.

(First embodiment)
Hereinafter, a light-emitting device, a method for manufacturing a light-emitting device, and an electronic apparatus according to the present invention will be described with reference to the drawings.

  In addition, embodiment described below shows the one aspect | mode of this invention, does not limit this invention, It can change arbitrarily within the range of the technical idea of this invention. Moreover, in each figure shown below, in order to make each layer and each member the size which can be recognized on drawing, the scale is varied for each layer and each member.

  FIG. 1 is a plan view showing the overall structure of an organic electroluminescence (organic EL) device as an embodiment of a light emitting device according to the present invention, FIG. 2 is a partial sectional view thereof, and FIG. It is a plane block diagram which shows the several light emitting element of EL apparatus. The organic EL device of the present embodiment is a top emission type that takes out output light from the light emitting layer from the element forming side, and is an active matrix organic EL device provided with a switching element corresponding to each light emitting element. .

  First, the overall configuration of the organic EL device of the present embodiment will be described with reference to FIG.

  The organic EL device 100 of this example is a plane in which pixel electrodes connected to a light emitting element driving unit (not shown) are arranged on a substrate 12 in a matrix on an electrically insulating substrate (base) 12. The pixel portion 33 (inside the one-dot chain line frame in FIG. 1) having a substantially rectangular shape is provided. The pixel unit 33 includes a display area 34 at the center (inside the two-dot chain line frame in FIG. 1) and a dummy area 35 (an area between the one-dot chain line frame and the two-dot chain line frame) arranged around the display area 34. ) And is divided. In the display area 34, pixels composed of light emitting elements (organic EL elements) 13 of three colors (R, G, B) each having a pixel electrode are arranged in a matrix, spaced apart in the vertical and horizontal directions on the paper surface. Has been. Further, scanning line driving circuits 38 are arranged on the left and right sides of the display area 34 in FIG. 1, while data line driving circuits 31 are arranged on the upper and lower sides of the display area 34 in FIG. The scanning line driving circuit 38 and the data line driving circuit 31 are arranged at the peripheral edge of the dummy area 35. In FIG. 1, the scanning lines and the data lines are not shown.

  Further, an inspection circuit 30 is arranged above the data line driving circuit 31 in FIG. The inspection circuit 30 is a circuit for inspecting the operating state of the organic EL device 100, and includes, for example, inspection information output means (not shown) for outputting the inspection result to the outside, and is in the middle of manufacturing or shipping. The quality and defects of the EL device can be inspected. The inspection circuit 30 is also arranged inside the dummy area 35. Further, a driving external substrate 36 is connected to the substrate 12, and an external driving circuit 32 is mounted on the driving external substrate 36.

  Next, referring to the cross-sectional structure shown in FIG. 2, the plurality of light emitting elements (pixels) 13 provided on one surface of the substrate 12 are electrically connected to the light emitting element driving unit 18 provided corresponding to each. It is connected. The light emitting element 13 is provided in a region surrounded by a bank (partition wall) 22 erected on the substrate 12, and is sandwiched between an anode (first electrode) 14 and a cathode (second electrode) 17. An EL layer (functional layer) 25 is provided. The EL layer 25 includes a light emitting layer 15 mainly composed of an organic electroluminescence material and a hole injection / transport layer 16. Further, a translucent sealing substrate 19 is shown on the element forming surface side of the substrate 12.

  In the case of this embodiment, the anode 14 and the cathode 17 are all formed of a light-reflective metal film such as silver, gold, or aluminum, and the cathode 17 is partially formed in the planar region of the anode 14. The light emitting element 13 has an opening 17a in the plane area. With this configuration, the anode 14 and a part of the EL layer 25 are exposed on the upper surface side of the element in the region corresponding to the opening 17a of the cathode 17, and the exposed region emits the output light of the light emitting element 13. It constitutes the light emission part. The illustrated three EL layers 25 each include, for example, light emitting layers of three colors of red (R), green (G), and blue (B), and the light emitting elements 13 (pixels) of these three colors are included. This constitutes one display unit of the organic EL device 100.

  The bank 22 surrounding the light emitting element 13 is formed in a substantially trapezoidal shape in cross section as shown in the drawing, and the inner wall surface 22b on the light emitting element 13 side is inclined with respect to the substrate surface. A contact hole 22 a reaching the light emitting element driving unit 18 is provided on the upper surface of the bank 22, and the light emitting element 13 is formed on the lower element forming layer 11 by the anode 14 partially embedded in the contact hole 22 a. Is electrically connected to the light emitting element driving unit 18 provided in the. The anode 14 and the light emitting element driving unit 18 may be directly conducted with the insulating layer 11 interposed therebetween. The light emitting element driving unit 18 supplies power corresponding to the display gradation to the light emitting element 13, and outputs applied voltage information to the light emitting element 13 according to data supplied from the display circuit, for example. Applying a circuit comprising a pixel selecting switching element and a pixel driving switching element for applying a voltage supplied from a power supply line to a light emitting element 13 based on voltage application information output from the pixel selecting switching element Can do.

  Further, the sealing substrate 19 and the substrate 12 are bonded through an adhesive layer (not shown), and the organic EL element 13 is sealed by the sealing substrate 19 and the adhesive layer. Further, a desiccant 20 for removing moisture in the sealed space is disposed on the inner surface side of the sealing substrate 19. Instead of providing an adhesive layer between the sealing substrate 19 and the substrate 12, an inert gas may be filled. As described above, the organic EL device 100 shown in FIG. 1 is a top emission type organic EL device that extracts light emitted from the light emitting layer 16 from the sealing substrate 19 side to the outside of the device.

  Next, looking at the planar structure shown in FIG. 3, in each light emitting element 13, the anode 14 and the EL layer 25 having a rectangular shape in plan view are arranged inside a bank 22 having an opening having a substantially rectangular shape in plan view. In addition, a cathode 17 having a plurality of rectangular openings (light emitting portions) 17 a is formed across the plurality of light emitting elements 13. The opening 17 a provided in the cathode 17 is disposed at a position that substantially overlaps the planar region of the anode 14 formed on the inner wall surface 22 b of the bank 22. Further, in the light emitting element 13 at both ends, the outer side of the cathode 17 in the left-right direction is also an opening 17a. A portion where the anode 14, the EL layer 25, and the cathode 17 overlap in a plane in the bank 22 constitutes a light emitting region 13 a of each light emitting element 13. In order to electrically insulate the anode 14 and the cathode 17 of the light emitting element 13, the portion of the anode 14 a formed on the inner wall surface 22 b of the bank 22 where the EL layer 25 is not disposed is the opening 17 a provided in the cathode 17. It is in the area of. In order to reliably insulate the anode 14 and the cathode 17 of the light emitting element 13, an insulating layer (not shown) may be disposed on the anode 14 a formed on the inner wall surface 22 b of the bank 22.

  In the organic EL device 100 of the present embodiment having the above-described configuration, when power is supplied from the light emitting element driving unit 18 to the light emitting element 13, light is emitted from the light emitting region 13a in which the EL layer 25 is sandwiched between electrodes. Layer 15 emits light. Since both the anode 14 and the cathode 17 sandwiching the EL layer 25 are formed using a metal film having light reflectivity, the light generated in the light emitting region 13a is reflected between both electrodes while the EL layer is reflected. It propagates in the direction of 25 planes. When the light propagating through the EL layer 25 reaches the outside of the cathode 17, the light is emitted from the light emitting portion 17 a opened upward in FIG. 2 to the sealing substrate 19 side.

  Here, in the light emitting element 13, the anode 14 is formed on the substrate 12 and along the inner wall surface 22 b inclined with respect to the surface of the substrate 12, so that the anode 14 rises from the substrate surface on both sides of the light emitting element 13. It has an almost boat shape. That is, the anode 14 is provided with inclined surface portions 14 a and 14 a inclined with respect to the substrate 12 on both sides thereof. With this configuration, light propagating outward from the light emitting region 13a is reflected by the inclined surface portions 14a and 14a of the anode 14, and is efficiently output from the light emitting portion 17a.

  Thus, the anode 14 functioning as a means for emitting the light generated inside has an inclination angle of 35 ° to 55 ° with respect to the substrate surface of the inclined surface portion 14a in order to efficiently reflect the output light upward to the substrate. The angle is preferably approximately 45 °. Further, the inclined surface portion 14a (that is, the inner wall surface 22b of the bank 22) may be configured to have a curved surface shape.

  As described above, according to the organic EL device 100 of this embodiment, the light generated in the light emitting region 13a of the light emitting element 13 is guided to the light emitting unit 17a while being reflected by the anode 14 and the cathode 17 sandwiching the EL layer 25. The light emitting portion 17a can output with high directivity above the substrate 12. That is, in the present organic EL device, although the output light from the light emitting element 13 does not pass through the transparent electrode even though it is a top emission type organic EL device, it is possible to extract the output light with extremely high efficiency. Furthermore, since a transparent conductive material made of a metal oxide is not used as the second electrode, a material having a low work function containing an alkali metal such as Li, Na, or an alkaline earth metal such as Be, Mg, or Ca is injected with electrons. Since it can be used as a layer, electrons can be efficiently injected into the light emitting layer, and the luminance of light from the light emitting element can be improved. In addition, a relatively thick layer can be used as the electron injection layer, and a material with low light transmittance may be used.

  Further, since the anode 14 and the cathode 17 are formed of a metal film, high reliability can be obtained as compared with a configuration in which the upper electrode is formed of a conventional transparent conductive material such as ITO. Furthermore, since the resistance is remarkably lower than that of the transparent conductive material, a voltage drop hardly occurs at the cathode 17 formed on almost the entire surface of the display region 34, and display unevenness or the like hardly occurs even when the screen is enlarged. .

  Hereinafter, a specific configuration example of each component of the organic EL device 100 will be described.

  In the organic EL device 100 shown in FIG. 1, examples of the material for forming the substrate 12 include glass, quartz, sapphire, or synthetic resin materials such as polyester, polyacrylate, polycarbonate, and polyetherketone. In addition to an opaque material, a transparent or translucent material that can transmit light can be used for the substrate 12, and inexpensive glass is preferably used.

  The anode 14 includes a metal film having light reflectivity (for example, gold, silver, etc.). If gold or silver is used as this metal film, the work function is large (preferably 4.6 eV or more), which is preferable when the anode 14 is formed of a single-layer metal film. Alternatively, a stacked structure with another conductive film can also be applied. The anode 14 can be formed using a known film formation method such as sputtering or vapor deposition.

  The cathode 17 is formed including a metal film having light reflectivity (for example, aluminum, gold, silver, or the like). That is, these metal films can be formed as a single layer, and the work function containing an alkali metal such as Li or Na or an alkaline earth metal such as Be, Mg or Ca on the EL layer 25 side of these metal films. Alternatively, a layer including a low material can be provided. The cathode 17 can be formed by a known film formation method, but is preferably formed selectively by a mask vapor deposition method using a metal mask so as not to damage the existing EL layer 25 during film formation. .

  Further, an antireflection film (antireflection means) can be provided on the outer surface side of the cathode 17. In the case of the present embodiment, the cathode 17 is arranged on the light-transmitting sealing substrate 19 side and is visually recognized by an observer. Therefore, when light incident on the organic EL device 100 is reflected by the cathode 17, the display is visually recognized. However, by providing the antireflection film, it is possible to prevent a decrease in visibility due to the reflected light, and to increase the contrast with the light emitting portion 17a, thereby improving the display quality. Also contributes.

  For the hole injection / transport layer 16, for example, polythiophene, polystyrene sulfonic acid, polypyrrole, polyaniline, and derivatives thereof are preferably exemplified as a polymer material. When a low molecular weight material is used, it is preferable to form a stacked hole injection layer and a hole transport layer. Examples of the material for forming the hole injection layer include copper phthalocyanine (CuPc), poly Examples thereof include polyphenylene vinylene, which is tetrahydrothiophenylphenylene, 1,1-bis- (4-N, N-ditolylaminophenyl) cyclohexane, tris (8-hydroxyquinolinol) aluminum, and the like, particularly copper phthalocyanine (CuPc). It is preferable to use it. The hole transport layer is made of a triphenylamine derivative (TPD), a pyrazoline derivative, an arylamine derivative, a stilbene derivative, a triphenyldiamine derivative, or the like. Specifically, JP-A-63-70257, JP-A-63-175860, JP-A-2-135359, JP-A-2-135361, JP-A-2-209998, JP-A-3-37992, and JP-A-3-152184. Examples described in the publication are exemplified, but a triphenyldiamine derivative is preferable, and 4,4′-bis (N (3-methylphenyl) -N-phenylamino) biphenyl is particularly preferable. Note that either the hole transport layer or the hole injection layer may be formed.

  As a material for forming the light emitting layer 15, polymer light emitters and low molecular organic light emitting dyes, that is, light emitting materials such as various fluorescent materials and phosphorescent materials can be used. Among the conjugated polymers that serve as the light-emitting substance, those containing an arylene vinylene or polyfluorene structure are particularly preferable. Examples of the low-molecular light emitters include naphthalene derivatives, anthracene derivatives, perylene derivatives, polymethine-based, xanthene-based, coumarin-based, cyanine-based pigments, 8-hydroquinoline and its metal complexes, aromatic amines, tetraphenylcyclo Pentadiene derivatives and the like, or known ones described in JP-A-57-51781 and 59-194393 can be used.

  In addition, you may provide an electron carrying layer and an electron injection layer between the cathode 17 and the light emitting layer 15 as needed. The material for forming the electron transport layer is not particularly limited, and is an oxadiazole derivative, anthraquinodimethane and its derivative, benzoquinone and its derivative, naphthoquinone and its derivative, anthraquinone and its derivative, tetracyanoanthraquinodimethane And derivatives thereof, fluorenone derivatives, diphenyldicyanoethylene and derivatives thereof, diphenoquinone derivatives, metal complexes of 8-hydroxyquinoline and derivatives thereof, and the like. Specifically, as with the material for forming the hole transport layer, JP-A-63-70257, JP-A-63-175860, JP-A-2-135359, JP-A-2-135361, and JP-A-2-209888 are disclosed. And the like described in JP-A-3-379992 and JP-A-3-152184, particularly 2- (4-biphenylyl) -5- (4-t-butylphenyl) -1,3,4. -Oxadiazole, benzoquinone, anthraquinone, tris (8-quinolinol) aluminum are preferred.

  As the sealing substrate 19, for example, a glass substrate is used. If the substrate is transparent and has excellent gas barrier properties, for example, a member other than a glass substrate such as a plastic, a plastic laminate film, a laminate molded substrate, or a glass laminate film is used. It may be used. A member that absorbs ultraviolet rays can also be used as the protective layer.

  The functional layer including the light emitting layer 15 of the organic EL device 100 shown in FIGS. 1 to 3 can be formed using a droplet discharge method (inkjet method). When the functional layer is formed by using the droplet discharge method, the bank 22 having a substantially lattice shape in plan view having an opening in a region where the functional layer is to be formed is formed. Then, the liquid material containing the functional layer forming material is discharged from the discharge head of the droplet discharge device to the opening of the bank 22, thereby forming a functional layer at a predetermined position.

  Here, the ejection head of the droplet ejection apparatus includes an inkjet head. The ink jet method may be a piezo jet method in which a fluid is ejected by a change in volume of a piezoelectric element, or a method using an electrothermal transducer as an energy generating element. The droplet discharge device may be a dispenser device. The liquid material refers to a medium having a viscosity that can be discharged from the nozzle of the discharge head. It does not matter whether it is aqueous or oily. It is sufficient if it has fluidity (viscosity) that can be discharged from a nozzle or the like. In addition, the solid material contained in the liquid material may be dissolved by being heated to a temperature higher than the melting point, or may be dispersed as fine particles in a solvent, and a dye, pigment or other functional material added in addition to the solvent It may be.

  Although detailed illustration is omitted, the organic EL device 100 of the present embodiment is an active matrix type, and actually, a plurality of data lines and a plurality of scanning lines form a substantially lattice shape in plan view, and the element formation layer 11 is formed. Formed. A light emitting element 13 is connected to each pixel that is partitioned into these data lines and scanning lines and arranged in a matrix via a driving TFT such as a switching transistor or a driving transistor. When a driving signal is supplied via the data line or the scanning line, a current flows between the electrodes, the light emitting layer 15 of the light emitting element 13 emits light, and light is emitted from the light emitting portion 17a to the outside of the sealing substrate 19, The pixel lights up.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a partial cross-sectional configuration diagram of the organic EL device 110 of the present embodiment, and corresponds to FIG. 2 in the organic EL device 100 of the previous embodiment. Although the sealing substrate is not shown in FIG. 4, the organic EL device 110 according to the present embodiment has the same basic configuration as that of the organic EL device 100 described above, and includes a bank 22 that partitions each light emitting element. It is characterized in that a subbank (internal partition wall) 32 that further partitions the same region is provided inside. Therefore, in the following description and FIG. 4, the same code | symbol is attached | subjected about the same component as previous embodiment, and detailed description shall be abbreviate | omitted.

  The organic EL device 110 illustrated in FIG. 4 includes a plurality of light emitting elements 53. Each light emitting element 53 is provided in a region surrounded by the bank 22 erected on the substrate 12. Each light emitting element 53 has a configuration in which an EL layer 25 is sandwiched between the anode 14 and the cathode 17, and is divided in a plane by a subbank 32 provided in the same layer as the bank 22. In each of the regions partitioned by the subbanks 32, the anode 14 and the cathode 17 are disposed opposite to each other with the EL layer 25 interposed therebetween, thereby forming a plurality (two in the drawing) of light emitting regions 13a. Yes. The cathode 17 is partially formed in the plane area of the anode 14 as in the previous embodiment, whereby openings 17a forming light emitting portions are formed on both sides of the light emitting area 13a. At the positions of the openings 17a, the anodes 14 formed on the banks 22 and the subbanks 32 have inclined surface portions 14a that follow the inner wall surfaces of these banks.

  In the organic EL device 110 having the above-described configuration, the light emitting layer 15 in the light emitting region 13a emits light by the current supplied from the light emitting element driving unit 18 that is conductively connected to the anode 14 through the contact hole. This light is reflected between the cathode 17 and the anode 14 and guided to both sides of the light emitting region 13a, so that it can be output from the light emitting portions (cathode openings) 17a provided at a plurality of locations. ing. The anode 14 and the light emitting element driving unit 18 may be directly conducted with the insulating layer 11 interposed therebetween. As described above, the light emitting element 13 is partitioned in a plane, and a plurality of light emitting regions 13a and the corresponding light emitting portions 17a are provided, so that even when a relatively large pixel is formed, high light can be obtained. Extraction efficiency can be obtained. Therefore, according to the organic EL device 110 of the present embodiment, a large screen display with high luminance is possible.

  Also in this embodiment, the inclined surface portion 14 a of the anode 14 formed by the light emitting portion 17 a is preferably formed at an angle of approximately 45 ° with respect to the main surface of the substrate 12. That is, the inner wall surface 32b of the subbank 32 preferably forms an angle of about 45 ° with respect to the substrate surface. By setting it as such a structure, a brightness | luminance becomes the maximum in the front direction of the organic EL apparatus 110, and a high-intensity display can be obtained in an observer direction.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a partial cross-sectional configuration diagram of the organic EL device 120 of the present embodiment, and corresponds to FIG. 2 in the organic EL device 100 of the previous embodiment.

  In FIG. 5, the sealing substrate is not shown, but in this embodiment, a configuration different from that of the previous embodiment is described, and the same configuration is denoted by the same reference numeral to simplify the description.

  As shown in FIG. 5, the organic EL device 120 of the present embodiment has the same basic configuration as that of the organic EL device 100, a bank (partition wall) 60, a cathode (second electrode) 62, and an interlayer insulating film 64. And have.

  Here, the bank 60 has a structure in which a first bank layer 60 a, a second bank layer 60 b, and a third bank layer 60 c are sequentially stacked on the interlayer insulating film 64. The first bank layer 60a is formed to have a substantially trapezoidal shape in cross section so as to surround the light emitting element 13, and the inner wall surface 60d on the light emitting element 13 side is inclined with respect to the substrate surface. It has become a surface. The second bank layer 60b is a reflective film formed following the shape of the first bank layer 60a, and is made of a light reflective metal film such as silver, gold, or aluminum. The third bank layer 60c is a transparent resin film formed following the shape of the second bank layer 60b, and is formed of a resin film such as acrylic. Accordingly, the bank 60 has a substantially trapezoidal shape in cross section, has light reflectivity, and has an insulating surface.

  The cathode 62 has a structure in which a transparent conductive film 62a and an auxiliary electrode 62b are laminated. The transparent conductive film 62a is a transparent conductive film such as indium tin oxide (hereinafter abbreviated as ITO). In addition to ITO, a material containing zinc (Zn) in a metal oxide, for example, an indium oxide / zinc oxide amorphous transparent conductive film (Indium Zinc Oxide: IZO / registered trademark) (Made by Idemitsu Kosan Co., Ltd.) can be used. Such a transparent conductive film 62 a is formed on the entire surface of the substrate 12 including the EL layer 25 and the bank 60.

  The auxiliary electrode 62b is partially formed on the transparent conductive film 62a in the planar region of each light emitting element 13. The auxiliary electrode 62b has higher conductivity than the transparent conductive film 62a, and assists the conductivity of the transparent conductive film 62a. In addition, the auxiliary electrode 62b is partially formed on the transparent conductive film 62a as described above, whereby the opening 63 is formed on the side of the auxiliary electrode 62b. Further, such an opening 63 is formed in the planar region of each light emitting element 13. In addition, in the opening 63, the light emitted from the light emitting layer 15 that passes through the transparent conductive film 62a passes as described later, and multiple reflections occur between the anode 14 and the auxiliary electrode 62b. The emitted light passes through the transparent conductive film 62a, and the emitted light reflected by the reflective film of the second bank layer 60b passes through the transparent conductive film 62a. Under such a configuration, a part of the EL layer 25 is in contact with the transparent conductive film 62a in a region corresponding to the opening 63 of the auxiliary electrode 62b, and the contact region emits output light of the light emitting element 13. It constitutes the light emission part. The illustrated three EL layers 25 each include, for example, light emitting layers of three colors of red (R), green (G), and blue (B), and the light emitting elements 13 (pixels) of these three colors are included. This constitutes one display unit of the organic EL device 100.

  The interlayer insulating film 64 is an insulating film provided between the anode 14 and the light emitting element driving unit 18, and the anode 14 and the light emitting element driving unit 18 through the contact hole 64 a formed in the interlayer insulating film 64. And are connected.

  A method for manufacturing such an organic EL device 120 will be described.

  First, after forming the light emitting element driving unit 18, the interlayer insulating film 64 and the contact hole 64a are formed. Next, a reflective anode 14 (ITO formation after Al film formation, or other metal film, silver, gold or other metal having a high reflectance and a work function of 4.6 eV or more) is formed. Next, the first bank 60a is formed of acrylic resin so that the taper angle is about 45 degrees. Next, a reflective metal film is formed to form the second bank 60b. Next, the third bank 60c is formed so as to cover the second bank 60b. Subsequently, the EL layer 25 is formed. An electron block layer, a hole transport layer, an electron transport layer, an electron injection layer, and a hole block layer are formed as necessary. Next, a transparent conductive film 62a is formed with a laminated structure such as Ca / ITO, and a reflective auxiliary electrode 62b is vapor-deposited with a metal such as Al through a mask, and the opening 63 is opened as shown in FIG. .

  In the organic EL device 120 configured as described above, power is supplied to the EL layer 25 sandwiched between the anode 14 and the cathode 62. As a result, power is supplied to the EL layer 25 sandwiched between the anode 14 and the transparent conductive film 62a, and the auxiliary electrode 62b assists the conductivity of the transparent conductive film 62a. Supplied. In the EL layer 25 supplied with electric power in this way, emitted light can be generated, and while the emitted light is subjected to multiple reflection between the anode 14 and the auxiliary electrode 62b, While the emitted light is reflected by the second bank 60b, the emitted light propagates in the plane direction in the EL layer 25 and the transparent conductive film 62a. Then, the emitted light finally transmitted through the transparent conductive film 62 a is emitted from the opening 63 to the outside of the organic EL device 120.

  As described above, in the organic EL device 120 of the present embodiment, the emitted light of the EL layer 25 can be multiple-reflected between the anode 14 and the auxiliary electrode 62b, and can be reflected by the second bank 60b. The emitted light can be reflected, and the emitted light can be propagated in the surface direction in the EL layer 25 and the transparent conductive film 62a. Then, the emitted light can be emitted from the opening 63 through the transparent conductive film 62a.

  In the organic EL device 120, since the auxiliary electrode 62b improves the conductivity of the transparent conductive film 62a, it is possible to efficiently supply power to the EL layer 25 and to extract emitted light with high efficiency. And a bright display can be realized. Further, since the transparent conductive film 62a is formed on the entire surface of the EL layer 25, the contact area with the EL layer 25 is increased as compared with the case where the electrode is formed in contact with a part of the EL layer 25. Can be made. Thereby, the light emission area can be increased as compared with the case where an electrode is formed on a part of the EL layer 25.

  Accordingly, as described above, the auxiliary electrode 62b assists the conductivity of the transparent conductive film 62a, so that the conductivity can be increased and the light emitting area can be increased, thereby further improving the light emission efficiency. realizable.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a partial cross-sectional configuration diagram of the organic EL device 130 of the present embodiment and corresponds to FIG. 2 in the organic EL device 100 of the previous embodiment. FIG. 7 is a plan view showing the main part of the organic EL device 130, for explaining the positional relationship among the auxiliary electrode, the anode, and the bank.

  In FIG. 6, the sealing substrate is not shown, but in this embodiment, a configuration different from the previous embodiment is described, and the same configuration is denoted by the same reference numeral, and the description is simplified. .

  As shown in FIG. 6, the organic EL device 130 of the present embodiment has a basic configuration similar to that of the previous organic EL device 120 and a bank (partition wall) 70.

  Here, the bank 70 has a structure in which a lyophilic bank layer 70 a and a liquid repellent bank layer 70 b are sequentially stacked on the interlayer insulating film 64. The lyophilic bank layer 70a is made of a highly lyophilic inorganic material such as silicon oxide, and the lyophobic bank layer 70b is an acrylic resin material that has been subjected to fluorine plasma treatment. In such a bank 70, when the EL layer 25 is formed using the droplet discharge method, the lyophilic bank layer 70a holds the EL layer 25 on the anode 14, so the EL layer 25 is formed on the anode 14. It becomes possible to form. Further, even when a flying bend occurs in the liquid material discharged from the discharge head and the liquid material is applied to the liquid repellent bank layer 70b, the liquid material is formed on the anode 14 by utilizing the liquid repellency of the liquid repellent bank layer 70b. Can be made to flow.

  In addition, the organic EL device 130 of the present embodiment has a configuration in which a plurality of openings 63 are formed for each light emitting element 13. Specifically, as shown in FIGS. 6 and 7, in the light emitting element 13 surrounded by the bank 70, a plurality of auxiliary electrodes 62 b are formed by branching, and an opening at a side portion of the auxiliary electrode 62 b. A plurality of 63 are formed.

  In such a configuration, the emitted light can be emitted from a larger number of openings 63 as compared with the organic EL device 120. Here, by forming the auxiliary electrode 62b in a desired pattern, the emitted light can be emitted from the desired opening 63. Further, when the intensity of the emitted light is biased due to the shape of the light emitting layer 15, the auxiliary electrode 62b is actively branched so that the emitted light can be extracted efficiently, and the opening 63 is brought to a desired position. By forming, the extraction efficiency of emitted light can be further improved. Moreover, since multiple reflection can be avoided by the above configuration, attenuation of emitted light due to the multiple reflection can be suppressed.

  Therefore, in the organic EL device 130 of the present embodiment, not only the same effect as the organic EL device 120 described above is obtained, but also the attenuation of the emitted light can be suppressed, so that further improvement of the luminous efficiency is realized. it can.

  In each of the above embodiments, the active matrix organic EL device has been described. However, the present invention is not limited to the active matrix organic EL device, and can be applied to a simple matrix organic EL device and a passive organic EL device. In each of the above embodiments, an organic EL device including an organic EL element as a light emitting element has been illustrated and described. However, the technical scope of the present invention is not limited to the above embodiment, and other than the organic EL element. Needless to say, the present invention can be applied to the case where a light emitting element is used, and is particularly suitable for an organic EL device in which light is emitted from the upper surface side of the light emitting element provided on the substrate.

(Fifth embodiment)
FIG. 8 is a schematic diagram showing a wiring structure of the organic EL device according to this embodiment.

  The organic EL device (light emitting device) 140 is an active matrix organic EL device using a thin film transistor (hereinafter abbreviated as TFT) as a switching element.

  As shown in FIG. 8, the organic EL device 140 includes a plurality of scanning lines 101, a plurality of signal lines 102 extending in a direction perpendicular to the scanning lines 101, and the signal lines 102 in parallel. A plurality of extending power lines 103 are wired, and pixel regions X are provided in the vicinity of the intersections of the scanning lines 101 and the signal lines 102.

  A data line driving circuit 32 including a shift register, a level shifter, a video line, and an analog switch is connected to the signal line 102. Further, a scanning line driving circuit 38 including a shift register and a level shifter is connected to the scanning line 101.

  Further, in each pixel region X, a switching TFT 112 to which a scanning signal is supplied to the gate electrode via the scanning line 101 and a pixel signal shared from the signal line 102 via the switching TFT 112 are held. A capacitor 113, a light emitting element driving unit 18 to which a pixel signal held by the holding capacitor 113 is supplied to the gate electrode, and the power source when electrically connected to the power supply line 103 via the light emitting element driving unit 18 An anode (electrode) 23 into which a driving current flows from the line 103 and a light emitting functional layer 82 sandwiched between the anode 14 and the cathode 17 are provided. In the light emitting functional layer 82, a light emission phenomenon is caused by combining holes and electrons injected from the anode 14 and the cathode 17.

  According to the organic EL device 140, when the scanning line 101 is driven and the switching TFT 112 is turned on, the potential of the signal line 102 at that time is held in the holding capacitor 113, and according to the state of the holding capacitor 113 The on / off state of the light emitting element driving unit 18 is determined. Then, a current flows from the power supply line 103 to the anode 14 via the channel of the light emitting element driving unit 18, and further a current flows to the cathode 17 via the light emitting functional layer 82. The light emitting functional layer 82 emits light according to the amount of current flowing therethrough. Therefore, since light emission is controlled on and off for each anode 14..., The anode 14 is a pixel electrode.

  Next, specific modes of the organic EL device 140 of the present embodiment will be described with reference to FIGS. 9 to 12. 9 is a plan view schematically showing the configuration of the organic EL device 140, FIG. 10 is a side sectional view of the display regions R, G, and B in FIG. 9, and FIG. 11 is an enlarged sectional view in which the vicinity of the light emitting layer is enlarged. 12 is a diagram for comparing the width of the power supply line and the width of the pixel.

  As shown in FIG. 9, the organic EL device 140 of this embodiment includes a substrate 12 having electrical insulation and anodes 14 connected to switching TFTs (not shown) arranged in a matrix on the substrate 12. A pixel electrode region (not shown), a power line 103 (see FIG. 8) disposed around the pixel electrode region and connected to the anodes 14 (see FIG. 8), and a substantially rectangular shape in plan view located at least on the pixel electrode region The pixel portion 33 (within the one-dot chain line in the drawing) and the data line driving circuit 31 are provided. In addition, the pixel unit 33 includes an actual display area 34 (inside the two-dot chain line in the drawing) in the center and a dummy area 35 (area between the one-dot chain line and the two-dot chain line) arranged around the actual display area 34. It is divided into and.

  In the actual display area 34, display areas R, G, and B each having anodes 14 are arranged apart from each other. Further, scanning line driving circuits 38 are arranged on both sides of the actual display area 34 in the drawing. The scanning line driving circuit 38 is provided below the dummy area 35.

  Further, an inspection circuit 30 is arranged on the upper side of the actual display area 34 in the drawing. The inspection circuit 30 is provided below the dummy area 35. The inspection circuit 30 is a circuit for inspecting the operating state of the organic EL device 140, and includes, for example, inspection information output means (not shown) for outputting the inspection result to the outside, and the organic EL device during manufacture or at the time of shipment. The quality and defect inspection can be performed.

  The driving voltage of the scanning line driving circuit 38 and the inspection circuit 30 is applied to the light emitting element driving unit 18 through the power source line 103 (see FIG. 10) from a predetermined power source unit. The drive control signals and drive voltages to the scanning line drive circuit 38 and the inspection circuit 30 are applied from a predetermined main driver that controls the operation of the organic EL device 140. The drive control signal in this case is a command signal from a main driver or the like related to control when the scanning line drive circuit 38 and the inspection circuit 30 output signals.

  As shown in FIG. 10, the organic EL device 140 is configured by bonding a substrate 12 and a sealing substrate 19 through a sealing resin 19a. In the region surrounded by the substrate 12, the sealing substrate 19 and the sealing resin 19a, a desiccant is inserted and an inert gas filling layer filled with an inert gas such as nitrogen gas is formed. Yes.

  In the substrate side light emission type (bottom emission type) organic EL device, the substrate 12 is configured to take out light emission from the substrate 12 side, and therefore, a transparent or translucent substrate is adopted. For example, glass, quartz, resin (plastic, plastic film) and the like can be mentioned. In particular, an inexpensive soda glass substrate is preferably used.

  In addition, a light shielding layer (light absorption layer) BM made of a light absorbing material such as chromium oxide or titanium oxide is formed on the base of the light emitting element driving unit 18 or the power source line 103. Further, a transparent insulating layer 80 is formed around the light shielding layer BM.

  As the sealing substrate 19, for example, a plate-like member having electrical insulation can be adopted. The sealing resin 19a is made of, for example, a thermosetting resin or an ultraviolet curable resin, and is preferably made of an epoxy resin that is a kind of thermosetting resin.

  Further, on the substrate 12, light emitting element driving portions 18 for driving the anodes 14, power supply lines 103, an interlayer insulating film 64, and an opening 81 are formed.

  The light emitting element driving unit 18 is a switching element formed by using a known TFT manufacturing technique, and is a member in which a silicon film doped with impurities, a gate electrode, a gate insulating film, and the like are stacked. Further, the light emitting element driving units 18 are provided corresponding to the positions of the display regions R, G, and B, and are connected to the anodes 14 as described later.

  The interlayer insulating film 64 is preferably made of a transparent resin material, and is preferably made of a material with good workability. For example, it is preferably made of a thermosetting resin or an ultraviolet curable resin, and as an example, it is preferable to employ an epoxy resin or an acrylic resin which is a kind of thermosetting resin. In the interlayer insulating film 64, it is preferable that the interface with the anodes 14 is flattened with high accuracy, and a structure in which a plurality of processes are laminated to achieve the flattening may be employed. Further, contact holes C are formed in the interlayer insulating film 64 in accordance with the positions of the light emitting element driving portions 18 and the anodes 14... And the light emitting element driving portions 18 and so on by connection wirings embedded in the contact holes C. The anodes 14 are connected.

  The various circuit portions covered with the interlayer insulating film 64 include a scanning line driving circuit 38, an inspection circuit 30, a driving voltage passing portion for connecting and driving them, a driving control signal conducting portion, and the like. include.

  The power supply line 103 supplies power to the light emitting functional layer 101 according to the on / off state of the light emitting element driving unit 18, and is preferably formed of a low resistance metal material. Is formed. Further, a reflective surface 103a having light reflectivity is formed on the surface of the power supply lines 103. Further, the reflecting surface 103a has light scattering properties.

  12, the width W2 of the power supply lines 103 and the width W1 of the pixels are preferably 10 μm or less, for example, when the pixel width W1 is 45 μm. Further, when it is necessary to increase the power supply line width W2 in order to reduce the resistance of the power supply lines 103, the power supply lines 103 are preferably divided into a plurality of lines. For example, when the total width of the power supply lines 103 is 20 μm, it is preferable to divide the power supply lines 103 into four with a line width of 5 μm. Alternatively, when the pixel width W1 is 50 μm and the power supply line width W2 is 10 μm, the number of power supply lines is preferably two. Moreover, it is good also as the interdigital shape which divided | segmented the power supply line 103 ... into plurality.

  The opening 81 is formed adjacent to the light emitting element driving unit 18 and the power supply line 103 to allow the emitted light emitted from the light emitting functional layer 82 to pass to the actual display region (display region) 4 side. It is a part of. Further, the opening area of the opening 81 is a flat area corresponding to the amount of transmitted light and the resistance value of the power source lines 103, the arrangement of the light emitting element driving unit 18, and between the light emitting functional layer 82 and the power source line 103. It is determined according to a design matter that considers the multiple reflection action of the emitted light.

The surface of the interlayer insulating layer 21 on which the anodes 14 are formed is composed of the anodes 14, a lyophilic control layer 90 mainly composed of a lyophilic material such as SiO ₂ , an acrylic resin, a polyimide resin, or the like. Bank layers (partition walls) 91 are covered. The bank layers 91 are arranged in a two-dimensional manner so as to surround the anode layers 14 between the anodes 14, and the light emitted from the functional layers 110 is partitioned by the bank layer 91. In addition, “lyophilic” of the lyophilic control layer in the present embodiment means that the lyophilic property is higher than at least materials such as acrylic resin and polyimide resin constituting the bank layer 91. .

  Further, the light emitting element driving unit 18 is connected to the anodes 14..., The light emitting functional layer 82 is formed on the upper layer of the anodes 14, and the cathode 17 is formed on the upper layer.

  The light emitting functional layer 82 has a multilayer structure sandwiched between the anode 14 and the cathode 17, and is formed by sequentially forming a hole injection layer 83 and a light emitting layer 84 (84R, 84G, 84B) from the anode 14 side. is there.

  The anode 14 is made of ITO, and injects holes toward the light emitting layer 84 by an applied voltage, and has a high work function and conductivity. The material for forming the anode 14 is not limited to ITO. In the case of a sealed-side light-emitting organic EL device, it is not necessary to use a material having light transmittance, and a suitable material. If it is. In the case of a substrate-side light emitting organic EL device, a known material having optical transparency can be used. For example, metal oxide can be cited, but indium tin oxide (ITO) or a material containing zinc (Zn) in the metal oxide, for example, indium oxide / zinc oxide based amorphous transparent conductive film (Indium Zinc Oxide: IZO / I z O (registered trademark)) (manufactured by Idemitsu Kosan Co., Ltd.) can be employed.

  The hole injection layer 83 is one of conductive polymer materials, and constitutes a hole injection layer for injecting holes of the anode 14 into the light emitting layer 84. The film thickness is 30 nm. Is formed. As an example of a material for forming such a hole injection layer, various kinds of conductive polymer materials are preferably used. For example, PEDOT: PSS, polythiophene, polyaniline, polypyrrole, and the like can be employed.

  The light emitting layer 84 generates fluorescence by combining holes injected from the anode 14 through the hole injection layer 83 and electrons injected from the cathode 17. As a material for forming the light emitting layer 84, a known light emitting material capable of emitting fluorescence or phosphorescence can be used. Specifically, polyfluorene derivative (PF), (poly) paraphenylene vinylene derivative (PPV), polyphenylene derivative (PP), polyparaphenylene derivative (PPP), polyvinylcarbazole (PVK), polythiophene derivative, polymethylphenylsilane A polysilane such as (PMPS) is preferably used. In addition, these polymer materials include polymer materials such as perylene dyes, coumarin dyes, rhodamine dyes, such as rubrene, perylene, 9,10-diphenylanthracene, tetraphenylbutadiene, Nile red, coumarin 6, A material such as quinacridone can be doped.

  In addition, the organic EL device 140 of the present embodiment is configured to perform color display. That is, each light emitting layer 84 is formed corresponding to each of the three primary colors for each of the display regions R, G, B corresponding to the three primary colors R, G, B of light, and constitutes the light emitting layers 84R, 84G, 84B.

  Next, the cross-sectional shape of the light emitting layer 84 will be described with reference to FIG.

  As shown in FIG. 11, the light emitting layer 84 has a concavo-convex surface OT provided with a convex portion (top) T and a concave portion (bottom portion) O at the top thereof, and further, a bank layer 91 is provided at the end of the convex portion T. It has a contact point (end) P that contacts the. At the contact point P, the angle θ formed between the perpendicular A extending in the vertical direction of the substrate 12 and the uneven surface OT is 30 ° or more and 50 ° or less. The angle θ is determined by adjusting the liquid repellency of the surface of the bank layer 91 with respect to the material liquid of the light emitting layer 84. Therefore, the angle θ is preferably set. Further, the convex portion T is formed at a position corresponding to the opening 81.

  As shown in FIG. 10, the cathode 17 has an area larger than the total area of the actual display region 34 and the dummy region 35, and is formed so as to cover each. The cathode 17 has a function of injecting electrons into the light emitting layer 84 as a counter electrode of the anode 14. As a material for forming the cathode 17, for example, calcium metal or an alloy containing calcium as a main component is laminated on the light emitting layer 84 side to form the first cathode layer, and aluminum or an alloy containing aluminum as a main component is formed on the upper layer, or A laminate in which silver or a silver-magnesium alloy or the like is laminated to form the second cathode layer can be employed. The second cathode layer covers the first cathode layer and is provided to protect from a chemical reaction with oxygen, moisture, etc. and to increase the conductivity of the cathode 17. Therefore, it is chemically stable, has a low work function, may have a single layer structure, and is not limited to a metal material.

  The cathode 17 has a reflecting surface on the light emitting layer 84 side, and reflects the light emitted from the light emitting layer 84 to the actual display region 34 side. The cathode 17 itself may be formed from a reflective material.

  Further, since the reflection surface of the cathode 17 is a curved surface formed according to the uneven surface OT of the light emitting layer 84, for example, the reflection surface formed on the convex portion T of the light emitting layer 84 faces the actual display region 34. It functions as a mirror that collects the emitted light.

  In the organic EL device 140 having such a configuration, when a driving current flows from the power supply line 103 (see FIG. 8) into the anode 14 of the light emitting functional layer 82, a potential difference is generated between the anode 14 and the cathode 17, and the anode 14 Holes are injected into the light emitting layer 84 through the hole injection layer 83, and electrons of the cathode 17 are injected into the light emitting layer 84, so that the holes injected into the light emitting layer 84 and the electrons are combined. Thus, the light emitting layer 84 emits light. The emitted light of the light emitting layer 84 may be emitted directly to the actual display region 34 through the opening 81, or the emitted light may collide with the power supply lines 103. Here, since the reflection surface 103a is formed on the power supply lines 103 ..., the emitted light is reflected by the reflection surface 103a of the power supply lines 103 ... and the reflection surface of the cathode 17 and emitted from the opening 81, or Multiple reflection occurs at the reflecting surface 103 a and the cathode 17 and propagates in the horizontal direction of the light emitting layer 84, and then exits from the opening 81. In addition, since the reflective layer 103a has light scattering properties, emitted light that collides with the reflecting surface 103a is scattered, and attenuation of emitted light due to multiple reflection is suppressed. Moreover, since the cathode 17 is formed according to the uneven surface OT of the light emitting layer 84, the cathode 17 has a curved reflecting surface. Further, since the convex portion T corresponds to the position of the opening 81, the reflection surface of the cathode 17 is formed at a position corresponding to the opening 81. Therefore, the emitted light reflected by the reflecting surface of the cathode 17 is collected and emitted from the opening 81 in a state where the intensity is increased.

  As described above, in the organic EL device 140 according to the present embodiment, the power supply lines 103 arranged so as to block the actual display region 34 are provided, and the power supply lines 103 have the reflection surface 103a, and the power supply Since the openings 81 are formed on the sides of the lines 103..., The emitted light is reflected and emitted from the openings 81 even if the power lines 103 are formed so as to block the actual display area 34. Therefore, it is possible to improve the extraction efficiency of the emitted light. In addition, when the screen of the organic EL device 140 is enlarged, the line width of the power supply line 103 is increased to reduce the wiring resistance, thereby blocking the actual display region 34 and improving the efficiency of extracting emitted light. Although there is a possibility of causing a decrease, it is possible to suppress a decrease in the extraction efficiency of emitted light by adopting the above configuration. Accordingly, since the degree of freedom of the wiring structure and wiring pattern is increased, it is possible to arrange various types of the light emitting element driving units 18 and the switching TFTs 112 and the power supply lines 103 at desired positions, thereby easily increasing the screen size. Can be applied.

  Since the emitted light is emitted from the opening 81, for example, the emitted light can be emitted from the desired opening 81 by forming the power supply lines 103 in a desired pattern. When the intensity of the emitted light is biased due to the shape of the light emitting layer 84 or the cathode 17, the pattern of the power supply lines 103 is positively adjusted so that the emitted light can be extracted efficiently, and the opening By forming 81 at a desired position, the extraction efficiency of emitted light can be further improved. The above configuration is particularly effective in a so-called bottom emission structure in which emitted light is extracted from the side of the substrate 12 on which the light emitting element driving sections 18 and various wirings are provided.

  Further, the power supply lines 103 may be branched into a plurality of lines.

  In this way, a plurality of openings 81 are formed by branching the power supply lines 103. As a result, emitted light can be emitted from the opening 81. Here, by forming the power supply lines 103 in a desired pattern, the emitted light can be emitted from the desired opening 81. Further, when the intensity of the emitted light is biased due to the shape of the light emitting layer 84 or the cathode 17, the power supply lines 103 are actively branched so that the emitted light can be extracted efficiently so that the opening 81 is formed. By forming it at a desired position, the extraction efficiency of emitted light can be further improved. Moreover, since multiple reflection can be avoided by the above configuration, attenuation of emitted light due to the multiple reflection can be suppressed.

  In addition, since the reflecting surface 103a has a light scattering property to scatter emitted light, the emitted light that collides with the reflecting surface 103a can be scattered. Accordingly, it is possible to prevent a deviation in the reflection direction of the emitted light. Further, if the light scattering property is provided so that the emitted light is not reflected on the light emitting layer 84 side, multiple reflection can be avoided, so that attenuation of the emitted light due to the multiple reflection can be suppressed.

  Further, since the cathode 17 has light reflectivity, emitted light emitted from the light emitting layer 84 toward the cathode 17 and emitted light reflected by the power supply line 103... Are directed toward the power supply line 103. Can be reflected.

  Moreover, since the light emitting layer 84 has the uneven surface OT, emitted light can be emitted according to the shape of the uneven surface OT. Further, since the light-reflective cathode 17 is formed so as to cover the uneven surface OT, emitted light can be emitted in the normal direction of the uneven surface OT. And since the convex part T or the recessed part O in the uneven | corrugated surface OT respond | corresponds with the opening part 81, emitted light can be reflected toward the opening part 81. FIG.

  Further, by forming the uneven surface OT in a desired shape, it is possible to collect the emitted light at a desired position, and the emission intensity can be partially increased. Further, by emitting the emitted light directly from the opening 81 or reflecting the light to an arbitrary part and then emitting the emitted light, it is possible to further promote the improvement of the emission light extraction efficiency.

  Further, at the contact point P where the uneven surface OT of the light emitting layer 84 and the bank layer 91 are in contact, the value of the angle θ is not less than 30 ° and not more than 50 °, so that the above effect can be further promoted.

  In addition, since the light shielding layer BM is formed, reflection of external light from the observer side observing the actual display region 34 is prevented, so that an improvement in contrast can be achieved.

  In the above configuration, the anodes 14 are made of a transparent conductive film made of ITO. However, the anodes 14 are made of a light reflective conductive film and correspond to the opening 81 of the light reflective conductive film. It is good also as a structure which has a slit in the position to do.

  If it does in this way, after reflection is repeated between anode 14 ... and the cathode 17, emitted light can be taken out from a slit part.

  In the above configuration, an electron injection / transport layer may be provided between the light emitting layer 84 and the cathode 17. Here, the electron injecting / transporting layer preferably has a film thickness that is light transmissive. In this way, the emitted light reflected by the cathode 17 is not shielded, and the emission intensity is reduced. Can be prevented.

  The electron injecting / transporting layer plays a role of injecting electrons into the light emitting layer 84, and the forming material is not particularly limited, and includes oxadiazole derivatives, anthraquinodimethane and its derivatives, benzoquinone and Examples thereof include naphthoquinone and derivatives thereof, anthraquinone and derivatives thereof, tetracyanoanthraquinodimethane and derivatives thereof, fluorenone derivatives, diphenyldicyanoethylene and derivatives thereof, diphenoquinone derivatives, metal complexes of 8-hydroxyquinoline and derivatives thereof, and the like. The Specifically, as with the material for forming the hole transport layer, JP-A-63-70257, JP-A-63-175860, JP-A-2-135359, JP-A-2-135361, and JP-A-2-209888 are disclosed. And the like described in JP-A-3-379992 and 3-152184, particularly 2- (4-biphenylyl) -5- (4-t-butylphenyl) -1,3,4. -Oxadiazole, benzoquinone, anthraquinone, tris (8-quinolinol) aluminum are preferred.

(Method for manufacturing organic EL device)
Next, a method for manufacturing the organic EL device 140 will be described with reference to FIG.

  First, a chromium oxide or titanium oxide film is formed on the substrate 12 as the light shielding layer BM, and is patterned so as to remove the light extraction portion. Next, if necessary, an insulating layer 80 is formed of SiO 2 or the like, and a scanning line 101, a signal line 102, a power line 103, a holding capacitor 113, a switching TFT 112, and a light emitting element driving unit 18 are formed thereon. Further, a data line driving circuit 32 and a scanning line driving circuit 38 are formed in the vicinity of the end of each wiring. And the distance between the light emitting element drive part 18 and the power supply line 103 ... is opened as much as possible. In this embodiment, the distance is 10 μm.

  Next, an interlayer insulating film 64 is formed. The film thickness of the interlayer insulating film 64 is preferably 100 nm or more. If the film thickness is insufficient, the wavelength of the emitted light may change and a desired emission color may not be realized. Therefore, it is preferable to form the interlayer insulating film 64 with a film thickness sufficient for reliably displaying the RGB colors. Further, by adjusting the film thickness of the interlayer insulating film 64, the distance from the light emitting layer 84 to the reflecting surface 103a of the power source line 103 and the light emission wavelength can be adjusted as appropriate. That is, it is preferable to determine the thickness of the interlayer insulating film in consideration of the wavelength region. Further, the thickness of the interlayer insulating film 64 is adjusted in accordance with the refractive index of the transmissive material through which the emitted light is transmitted. In addition, the upper surface of the interlayer insulating film 64 is preferably flattened. Therefore, the interlayer insulating film 64 may be formed in a plurality of steps.

  Next, ITO to be the anodes 14 is formed on the interlayer insulating film 64 and patterned.

  Here, a contact hole C is preferably formed in the interlayer insulating film 64 in advance. By forming the anodes 14 in this way, the drain electrodes of the light emitting element driving units 18 are connected to the anodes 14. The anodes 14 may be formed by ejecting and drying material ink by a printing method or an ink jet method and forming a film at a predetermined position.

Next, after forming SiO ₂ as an inorganic insulating film for determining the pixel opening, patterning is performed to form the lyophilic control layer 90.

  Next, a bank layer 91 is formed by forming a resin material on the lyophilic control layer 90 and patterning it (step of forming partition walls). Here, the film thickness of the bank layer 91 was 50 nm. Specifically, for example, an organic resin layer is formed by applying a resist solution such as acrylic resin or polyimide resin dissolved in a solvent by various coating methods such as spin coating or dip coating, and then patterned by etching or the like. can do. However, it is more preferable that the material ink is ejected and dried by a printing method or an ink jet method (material ejection method) because a patterning process is not required and the material is not wasted. Here, when the film thickness of the bank layer 91 is 100 nm or more, since the profile after drying of the organic layer in the pixel becomes flat, the emission efficiency is lowered. Therefore, the film thickness should be 50 nm or less if possible. Is preferred. Further, as a thin liquid repellent film, VUV (ultraviolet light having a wavelength of 300 nm or less) may be irradiated only on the pixel opening after performing a liquid repellent treatment instead of the bank layer 91. As the liquid repellent treatment agent, a titanium coupling agent with a fluorinated alkyl or a silane coupling agent may be used.

  In the case where the power supply line is subdivided into the interdigital shape and the emitted light is emitted from the gap, the thickness of the bank 91 is not limited to this, and the parasitic capacitance between the TFT or wiring and the cathode is reduced to a negligible level. The thickness of the bank 91 is preferably about 1 to 2 μm.

  Next, after irradiating the whole surface with oxygen plasma as a lyophilic process, CF4 plasma is irradiated to make only the surface of the bank layer 91 liquid repellent.

  Next, the hole injection layer 83 and the light emitting layer 84 are formed by using an inkjet method (droplet discharge method) (step of forming the light emitting layer adjacent to the partition wall). That is, the hole injection layer 83 is formed by discharging PEDOT: PSS ink as a hole injection material so as to be adjacent to the bank layer 91, drying, and baking at 200 ° C. Further, materials emitting light of red, green, and blue as the light emitting layer 84 are sequentially ejected so as to be adjacent to the bank layer 91 to form three primary colors.

  Next, the reflective cathode 17 is formed by vapor deposition, and further a passivation film 85 is formed. Further, the organic EL device 140 is completed by adding a desiccant (not shown) and bonding the sealing substrate 19.

  As described above, the method for manufacturing the organic EL device 140 of the present embodiment has the same effects as those of the organic EL device 140 described above.

  Further, since the method includes the step of forming the bank layer 91 and the step of forming the light emitting layer 84 adjacent to the bank layer 91 by an ink jet method, the bank layer 91 has a contact point P at the contact point P between the bank layer 91 and the light emitting layer 84. The contact can be made at a desired angle due to various factors such as liquid repellency, lyophilicity of the base, and evaporation of the material solvent of the light emitting layer 84. Therefore, the above-described uneven surface OT can be easily formed.

(Sixth embodiment of light emitting device)
Next, a sixth embodiment of the light emitting device of the present invention will be described with reference to FIG.

  In the present embodiment, the same components as those in the fifth embodiment are denoted by the same reference numerals, and the description is simplified.

  As shown in FIG. 13, the organic EL device (light emitting device) 150 of the present embodiment has a configuration in which a reflective portion 95 having light reflectivity is formed on the actual display region 34 side of the substrate 12.

  Thus, by providing the reflection part 95 in the board | substrate 12, the emitted light radiate | emitted from the opening part 81 can be reliably radiate | emitted to the observer side. Therefore, the above effect can be further promoted.

  As shown in the fifth and sixth embodiments described above, a bottom emission structure in which power wiring can be provided in a pixel while ensuring reliability using a practical electrode. Can be realized. Also, with this configuration, out of the emitted light in the light emitting layer 84, light propagating in the plane (horizontal direction of the substrate 12) can also be emitted to the outside, so that light extraction efficiency of 80% or more can be realized. Can do. In addition, the pixel opening can be made small, and by performing light absorption treatment on the part other than the pixel opening, an improvement in contrast can be achieved without using a polarizing plate.

  In addition, in the organic EL devices 100, 110, 120, 130, 140, and 150 of the first to sixth embodiments, an optical component such as a lens may be provided as a configuration that improves emission light extraction efficiency. Good.

  Moreover, in the said 1st-6th embodiment, although the organic EL device as a light-emitting device was demonstrated, this invention does not limit an organic EL device. In addition to the organic EL device, the present invention can be applied to devices using plasma emission or fluorescence using electron emission (for example, PDP, FED, SED).

(Electronics)
Next, an example of an electronic apparatus including the organic EL device according to the above embodiment will be described.

  FIG. 14A is a perspective view showing an example of a mobile phone. In FIG. 14A, reference numeral 1000 denotes a mobile phone body, and reference numeral 1001 denotes a display unit using the organic EL device.

  FIG. 14B is a perspective view showing an example of a wristwatch type electronic device. In FIG. 14B, reference numeral 1100 denotes a watch body, and reference numeral 1101 denotes a display unit using the organic EL device.

  FIG. 14C is a perspective view illustrating an example of a portable information processing apparatus such as a word processor or a personal computer. In FIG. 14C, reference numeral 1200 denotes an information processing apparatus, reference numeral 1202 denotes an input unit such as a keyboard, reference numeral 1204 denotes an information processing apparatus body, and reference numeral 1206 denotes a display unit using the organic EL device.

  Since the electronic devices shown in FIGS. 14A to 14C include the organic EL device according to the above-described embodiment, the electronic device includes a display unit that can display an image with high luminance and high contrast.

  Note that the electronic device is not limited to the above-described mobile phone and can be applied to various electronic devices. For example, notebook computers, liquid crystal projectors, multimedia-compatible personal computers (PCs) and engineering workstations (EWS), pagers, word processors, televisions, viewfinder type or monitor direct view type video tape recorders, electronic notebooks, electronic desks The present invention can be applied as a display unit of an electronic device such as a computer, a car navigation device, a POS terminal, or a device provided with a touch panel.

  In addition, the electronic device of the present invention can reduce unevenness in luminance of the light-emitting element, and thus can be suitably used for an electronic device including a display area with a large area of, for example, 20 inches diagonal.

1 is an overall plan configuration diagram of an organic EL device shown in a first embodiment of the present invention. 1 is a partial cross-sectional configuration diagram of an organic EL device shown in a first embodiment of the present invention. The some light emitting element plane block diagram of the organic electroluminescent apparatus shown to the 1st Embodiment of this invention. The partial cross section block diagram of the organic electroluminescent apparatus shown to the 2nd Embodiment of this invention. The partial cross section block diagram of the organic electroluminescent apparatus shown to the 3rd Embodiment of this invention. The partial cross section block diagram of the organic electroluminescent apparatus shown in the 4th Embodiment of this invention. The top view which shows the principal part of the organic electroluminescent apparatus shown to the 4th Embodiment of this invention. The schematic diagram which shows the wiring structure of the organic electroluminescent apparatus shown to the 5th Embodiment of this invention. The top view which shows typically the structure of the organic electroluminescent apparatus shown to the 5th Embodiment of this invention. The sectional side view of the display area of the organic electroluminescent apparatus shown in the 5th Embodiment of this invention. The expanded sectional view of the light emitting layer vicinity of the organic electroluminescent apparatus shown to the 5th Embodiment of this invention. The comparison figure of the power supply line width and pixel width of the organic electroluminescent apparatus shown in the 5th Embodiment of this invention. The sectional side view of the display area of the organic electroluminescent apparatus shown in the 6th Embodiment of this invention. The figure which shows an electronic device provided with the organic electroluminescent apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Element formation layer, 12 Substrate (base | substrate), 13 Light emitting element, 13a Light emission area | region, 14 Anode (1st electrode), 14a Inclined surface part, 15 Light emitting layer, 16 Hole injection / transport layer, 17 Cathode (2nd Electrode), 17a light emitting portion, 18 driving TFT, 19 sealing substrate 12 desiccant, 22 bank (partition), 22a contact hole, 22b (bank) inner wall surface, 32 subbank (internal partition), 32b (subbank) ) Inner wall surface, 25 EL layer (functional layer), 100, 110, 120, 130, 140, 150 ... organic EL device (light emitting device), 34 ... actual display region (display region), 12 ... substrate, 17a, 63, DESCRIPTION OF SYMBOLS 81 ... Opening part, 14 ... Anode (electrode), 17 ... Cathode (electrode), 84 ... Light emitting layer, 95 ... Reflection part, 103 ... Power supply line (wiring), 103a ... Reflection surface, OT ... Uneven surface, T ... Convex part (top part), O ... Concave part (bottom part), θ ... Angle, P ... Contact point (end part), A ... Vertical direction, BM ... Light shielding layer (light absorption layer)

Claims (11)

On the substrate,
A light emitting region provided with a light emitting element having a first electrode, a second electrode, and a light emitting layer provided between the first electrode and the second electrode;
A first wiring provided between the first electrode and the substrate; and a second wiring ;
The first electrode has optical transparency,
The second electrode, the first wiring, and the second wiring have light reflectivity,
In the plan view, at least a part of the first wiring and the second wiring and the light emitting region overlap,
The width of each of the first wiring and the second wiring is smaller than the width of the light emitting region. On the substrate,
A light emitting region provided with a light emitting element having a first electrode, a second electrode, and a light emitting layer provided between the first electrode and the second electrode;
A wiring provided between the first electrode and the base body,
The first electrode has optical transparency,
The second electrode and the wiring have light reflectivity,
In plan view, at least a part of the wiring and the light emitting region overlap,
The wiring have a opening in a portion overlapping with the light emitting region,
The light emitting layer has an uneven surface on a surface opposite to the wiring,
The opening of the wiring is provided at a position corresponding to the convex portion of the uneven surface in plan view . On the substrate,
A light emitting region provided with a light emitting element having a first electrode, a second electrode, and a light emitting layer provided between the first electrode and the second electrode;
Wiring provided between the first electrode and the base body,
The first electrode has optical transparency,
The second electrode and the wiring have light reflectivity,
In plan view, at least a part of the wiring and the light emitting region overlap,
The width of the wiring is rather smaller than the width of the light emitting region,
The light emitting layer has an uneven surface on a surface opposite to the wiring,
The light emitting device , wherein the convex portion of the concave and convex surface is provided at a position not overlapping with the wiring in a plan view . At the end of the uneven surface, the angle between the vertical and the uneven surface of the substrate, 30 ° or more, light emitting device according to claim 2 or 3, characterized in that 50 ° or less. The light emitted from the light emitting layer, the light emitting device according to any one of claims 1 to 4, characterized in that it is emitted from the first electrode side. Wherein the wiring-emitting device according to any one of claims 1 to 5, characterized in that it is connected to the first electrode and electrically. The light emitting device according to claim 6 , wherein the wiring is a power supply line that supplies a current to the light emitting element. Between the substrate and the wiring, to the substrate and the wiring and overlaps the region in a plan view, according to any one of claims 1 to 7, characterized in that the light absorbing layer is provided Light-emitting device. On the substrate, having a partition formed so as to surround the light emitting region,
The reflective portion that reflects light emitted from the light emitting layer toward the substrate is provided in at least a part of a region overlapping the partition in plan view between the base and the partition. The light emitting device according to any one of 1 to 8 . The EML emitting device according to any one of claims 1 to 9, characterized in that it contains an organic electroluminescent material. An electronic apparatus comprising the light-emitting device according to any one of claims 1 to 10.

Images