JP2001237083A - Organic light emission equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unevenness of light emission of pixels and degradation of a pixel by making a flow of current within a pixel electrode and a flow of a current between a pixel electrode and an inter-pixel electrode smooth. SOLUTION: In an organic light emitting equipment which is comprised of at least one-layer of an organic LED(light emitting diode) layer which is sandwiched between the pixel electrode and the opposite electrode and arranged on a substrate, and the pixel electrodes which are connected by the electrode between pixels, the pixel electrode and the inter-pixel electrode are connected through the connection portion which have a width larger than the width of the inter-pixel electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light-emitting device, and more particularly, to an organic light-emitting device with improved connection between pixel electrodes.

[0002]

2. Description of the Related Art An organic light emitting device includes an organic light emitting device including at least one organic light emitting layer sandwiched between a pixel electrode and a counter electrode.
This is a display in which an ED layer is arranged as a light emitting pixel on a substrate, and light is emitted from an organic light emitting layer included in an organic LED layer by applying a voltage between a pixel electrode and a counter electrode. Organic light-emitting materials constituting the organic light-emitting layer, a wide range of low-molecular to high-molecular materials are selectively used,
The lifetime of 10,000 hours has been achieved by emitting red, green and blue light. A full-color organic LED display using these materials has also been announced (S.Miyaguchi
^{et.al., 9 th International Workshop on Inorganic} an
d Organic Electroluminescence).

In general, pixel electrodes are arranged in stripes or deltas. In particular, when the pixel electrodes have a delta arrangement, the pixel electrodes are arranged in a lattice or nest on the substrate, and are connected by inter-pixel electrodes serving as non-light emitting portions. The inter-pixel electrode is formed to have a width smaller than the width of the pixel electrode in order to make the pixel finer.

[0004]

When an organic light-emitting device such as an organic LED display having the above-described electrode configuration is driven, a current C flows from the inter-pixel electrode 8 to the pixel as shown in FIG. When entering the electrode 2, the current C does not sufficiently spread to the edge of the pixel, and the light emission at the corner of the pixel is weaker than that at the center (portion 101). Further, as shown in FIG. 9B, when a current flows from the pixel electrode 2 to the inter-pixel electrode 8, the vicinity of the contact point between the pixel electrode 2 and the inter-pixel electrode 8 (10 in FIG.
2), there arises a problem that light emission locally increases and the element is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to smooth out the flow of current between pixel electrodes to prevent uneven light emission of pixels and deterioration of elements.

[0006]

According to the present invention, an organic LED layer including at least one organic light emitting layer sandwiched between a pixel electrode and a counter electrode is arranged on a substrate, and the pixel electrode is an inter-pixel electrode. An organic light emitting device connected by:
An organic light emitting device is provided in which a pixel electrode and an inter-pixel electrode are connected to each other via a connection portion wider than the width of the inter-pixel electrode.

That is, when pixel electrodes arranged in a lattice or nest on a substrate are connected by an inter-pixel electrode having a width smaller than the width of the pixel electrode, the connection between the pixel electrodes and the inter-pixel electrodes is reduced. By making the portion wider than the width of the inter-pixel electrode, the current flows between the pixel electrodes, that is, the current flows from the inter-pixel electrode to the pixel electrode and the current flows from the pixel electrode to the inter-pixel electrode. The outflow can be smooth. Therefore, deterioration of the element due to uneven light emission or electric field concentration in the pixel is prevented.

The connection portion in the present invention is a connection portion (contact point) for electrically connecting a pixel electrode and an inter-pixel electrode.
[Hereinafter referred to as a “connection portion”], which has a shape wider than the width of the inter-pixel electrode and is made of a conductor. It is preferable that the connection portion is fan-shaped from the inter-pixel electrode and connected to the pixel electrode, and the connection area (length) with the pixel electrode is preferable.
Is larger than the connection area (length) with the inter-pixel electrode,
A plurality of band-shaped conductors spread in a fan shape from the inter-pixel electrode and are branched and connected over the entire width of the pixel electrode, or are branched and connected near both ends even if the connection area (length) of the two does not change. Is exemplified.

The pixel electrodes are arranged in a nested manner such that the corners of the pixel electrode face the outer edge of the connection portion, and the corners of the pixel electrode have a shape along the outer edge of the connection portion. Produces a fine display by securing the shape and area necessary to smooth the flow of current between the electrodes, and making the pitch between each pixel smaller while maintaining insulation between adjacent pixel electrodes. can do. In the present invention, a configuration in which the corners of the pixel electrode are rounded is exemplified. Specific forms of the corners of the pixel electrode include a corner that is chamfered with at least one straight line and a corner that is chamfered with a curve that is concave or convex toward the center.

In the present invention, the connection portion between the pixel electrode and the inter-pixel electrode may be formed of only a transparent electrode, a transparent electrode and a metal electrode, or only a metal electrode. When the pixel electrode and the inter-pixel electrode are formed of a transparent electrode, by laminating a metal electrode on the transparent electrode as the inter-pixel electrode, it is possible to reduce the wiring resistance between the pixels. Further, by forming the pixel electrode with a transparent electrode and the inter-pixel electrode with a metal electrode, it is possible to reduce wiring resistance between pixels. In addition, by covering the end of the inter-pixel electrode with the metal electrode material, it is possible to more efficiently flow current to every corner of the pixel.

In the present invention, an example is shown in which the pixel electrode is formed in a substantially rectangular shape, and the connection portion is formed at the center, the end, or the entire width of one side of the pixel electrode.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
Embodiments of the organic light emitting device of the present invention will be described, but the present invention is not limited to these embodiments. FIG. 1 shows an organic LE forming an organic light emitting device of the present invention.
1 shows a basic structure of a D element. In FIG. 1, the organic LE
The D element 10 includes a polarizing plate 6, a substrate 1, a pixel electrode 2, an organic L
The ED layer 3, the counter electrode 4, and the sealing substrate 5 are stacked in this order, and the partition 7 surrounds the periphery of the organic LED layer 3 to form one pixel.

The substrate 1 is not particularly limited as long as it is an insulating substrate. For example, a substrate made of an inorganic material such as a quartz substrate or a glass substrate, or a plastic substrate such as polyester, polymethacrylate, polycarbonate, or polysulfone is used. Is done.

The pixel electrode 2 and the counter electrode 4 are an electrode pair forming a positive electrode and a negative electrode. When a display including a plurality of organic LED elements 10 is formed, when the substrate 1 and the pixel electrode 2 are transparent, Since the light emitted from the organic LED layer 3 is emitted from the substrate 1 side, in order to increase the luminous efficiency, the counter electrode 4 is a reflective electrode or the counter electrode 4 is reflected on the side not adjacent to the organic LED layer 3. It is preferred to have a membrane. Conversely, the opposing electrode 4 may be made of a transparent material so that light emitted from the organic LED layer 3 is emitted from the opposing electrode 4 side. In this case, it is preferable that the pixel electrode 2 is a reflective electrode, the substrate 1 is a reflective substrate, or a reflective film is provided between the pixel electrode 2 and the substrate 1.

As the transparent electrode, ITO, SnO ₂ , Z
A transparent electrode such as nO is used. Examples of the reflective electrode include metals such as aluminum and calcium; alloys such as magnesium-silver and lithium-aluminum; laminated films of metals such as magnesium / silver;
A laminated film of an insulator such as aluminum and a metal is used. The pixel electrode 2 and the counter electrode 4 are formed by sputtering, E
On the substrate or organic LE by B evaporation, resistance heating evaporation, etc.
Each is formed on the D layer 3.

The organic LED layer 3 may have a single layer structure of an organic light emitting layer or a multilayer structure of a charge transport layer (hole transport layer, electron transport layer) and an organic light emitting layer. Examples of the multilayer structure include a hole transport layer / organic light emitting layer, an organic light emitting layer / electron transport layer, and a hole transport layer / organic light emitting layer / electron transport layer. The organic light emitting layer may have a single layer or a multilayer structure. As the light emitting material used as the organic light emitting layer, a known light emitting material for an organic LED is used. For example, a low molecular light emitting material (for example, an aromatic dimethylidene compound, an oxadiazole derivative, a triazole derivative, a thiopyrazine dioxide) is used. Fluorescent organic materials such as derivatives, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, diphenoquinone derivatives, and fluorenone derivatives; fluorescent organic metal compounds such as azomethine zinc complex and (8-hydroxyquinolinato) aluminum complex; (For example, RO-PPP, PPP- _NEt3 ⁺ , M
EH-PPV, MPS-PPV, CN-PPP, etc.),
Precursor of polymer light emitting material (for example, PPV precursor, PN
V precursor, PPP precursor, etc.).

The organic light-emitting layer may be composed of only the above-mentioned light-emitting material, or may be a known charge-transport layer (hole-transport material, electron-transport material), an additive (donor, acceptor, etc.), or a light-emitting material. May be contained. Further, these may be dispersed in a polymer material such as polycarbonate, polyvinyl carbazole and polyacrylate, or in an inorganic material such as SiO ₂ and MgO. The charge transport layer may have a single layer or a multilayer structure. As the charge transport material used as the charge transport layer, known charge transport materials for organic LEDs and organic photoconductors are used.

Examples of such a charge transport material include a hole transport material (for example, an inorganic p-type semiconductor material, a porphyrin compound, N, N'-bis- (3-methylphenyl) -N, N'-bis -(Phenyl) benzidine, N,
PEDOT, Poly-, such as low molecular weight materials such as aromatic tertiary amine compounds such as N'-di (naphthalen-1-yl) -N, N'-diphenyl-benzidine, hydrazone compounds, quinacridone compounds and styrylamine compounds;
Pre-PP, such as polymer materials such as TPD and PVCz
V, a polymer material precursor such as Pre-PNV), an electron transporting material (eg, an inorganic n-type semiconductor material, an oxadiazole derivative, a triazole derivative, a thiopyrazine dioxide derivative, a benzoquinone derivative, a naphthoquinone derivative, an anthraquinone derivative, Low-molecular-weight materials such as diphenoquinone derivatives and fluorenone derivatives). The charge transport layer may be composed of only the charge transport material described above, or may contain an optional additive. Also,
The charge transport material may be dispersed in the above-mentioned polymer material or inorganic material.

The organic light emitting layer and the charge transporting layer are formed by a coating method such as a spin coating method, a dipping method and a doctor blade method, a printing method such as an ink jet method and a screen printing method, a wet process such as a transfer method, or a vacuum deposition. The film can be formed by a dry process such as a method.

The partition 7 can be manufactured by photolithography. In this case, after preparing a photomask of the partition 7 having a desired shape and forming a resist film,
Exposure and etching using this photomask,
The partition 7 having a desired shape can be formed. Partition wall 7
May be formed at least in a part between pixels,
The structure of the partition wall 7 may be a single-layer structure or a multilayer structure in which thin films are overlapped. It is also preferable to use a material for a black matrix in order to improve display quality as a display.

The sealing substrate 5 is provided to prevent the counter electrode 4 from being damaged or deteriorated, and to prevent moisture from entering the element. Examples of the sealing substrate 5 include a resin and a glass substrate. An inert gas or an inert liquid may be injected between the counter electrode 4 and the sealing substrate 5. The deflecting plate 6 is provided outside the substrate 1 in order to obtain good contrast in a display when light emitted from the organic light emitting layer is emitted from the substrate 1 side. As the deflecting plate 6, a conventional linear deflecting plate and a wavelength 1 /
A combination with a deflection plate for filtering 4λ is preferable.

Next, the form of connection between the pixel electrodes 2 in the organic LED element 10 will be described with reference to the plan view of FIG. In the organic LED element 10, the pixel electrode 2 is connected to the adjacent pixel electrode 2 or the electrode terminal portion by the inter-pixel electrode 8. Pixel electrode 2 and inter-pixel electrode 8
Are connected to each other via a connection portion 9 wider than the width of the inter-pixel electrode 8 and smaller than the width of the pixel electrode 2.

The connecting portion 9 is, as shown in FIG.
The end 91 of the inter-pixel electrode 8 in contact with the pixel electrode 2 is linearly enlarged 91 toward the pixel electrode 2, and as shown in FIGS. 2B and 2C, the inter-pixel electrode 8 in contact with the pixel electrode 2 2, 92 and 93 are enlarged in a curved shape toward the pixel electrode 2. As shown in FIG. 2D, a plurality of band-shaped conductors spread in a fan shape from the inter-pixel electrode 8, and One 94 that is branched and connected near both ends is exemplified.

The flow of current between the pixel electrode 2 and the inter-pixel electrode 8 when such a connection portion 9 is formed will be described with reference to FIG. 3A having a connection portion 91 as an example. Will be described. The current C flowing from the narrow inter-pixel electrode 8 to the pixel electrode 2 spreads to the edge of the pixel electrode 2 due to the connection portion 9 when entering the pixel electrode 2 from the inter-pixel electrode 8. Therefore, the light emission at the corner of the pixel, that is, at the corner of the light emitting portion formed of the organic LED layer 3 formed on the pixel electrode 2 does not become weaker than at the center. In addition, the current C flowing from the pixel electrode 2 to the narrow inter-pixel electrode 8 flows smoothly without electric field concentration near the contact point between the pixel electrode 2 and the inter-pixel electrode 8 due to the connection portion 9. Therefore, it is possible to prevent uneven light emission in the pixel and local deterioration of the element.

Referring to the plan view of FIG.
Another form of connection of the pixel electrode 2 in the element 10 will be described. 4 (a) to 4 (e) show that, at the end where the pixel electrode 2 and the inter-pixel electrode 8 are in contact with each other, the width is wider or larger than 90 ° so that the electric field concentration is hardly generated. Shows a form in which the corner 2a of FIG. In FIG.
(A), (b) and (c) show each corner 2 of the pixel electrode 2.
"a" indicates a form in which the corners are straightened, and (d) and (e) indicate that each corner 2a of the pixel electrode 2 is rounded in a concave or convex shape toward the center. The form is shown. 4C has a width wider than the width of the inter-pixel electrode 8 and substantially equal to the width of the pixel electrode 2.

FIGS. 5A, 5B and 5C show an organic LED in which the pixel electrodes 2 shown in FIGS. 4A, 4D and 4E are arranged on a substrate 1. FIG. 1 shows an embodiment of a display 20. In FIG. 5, the pixel electrode 2 has a shape in which the corners 2 a of the pixel electrode 2 are arranged in a nested shape facing the edge 9 a of the connection portion 9, and the corner 2 a of the pixel electrode 2 is along the edge 9 a of the connection portion 9. Having. Therefore, the shape and area necessary for smoothing the current flow between the pixel electrode 2 and the inter-pixel electrode 8 are ensured, and the insulation between the adjacent pixel electrodes 2 is maintained while maintaining the insulation between the adjacent pixel electrodes 2. A finer display can be manufactured by making the pitch finer.

The inter-pixel electrode 8 may be made of the same material as the pixel electrode 2 or may be made of a different material. Further, each of them may be constituted by a laminated structure of different materials. Examples of the inter-pixel electrode 8 include a conventional transparent electrode, a metal electrode, or an electrode obtained by laminating both. When a transparent electrode is used, it is preferable to form a metal electrode on the transparent electrode to reduce wiring resistance. The inter-pixel electrode 8 is formed by sputtering, EB evaporation, resistance heating evaporation, or the like. When a transparent electrode is provided as the inter-pixel electrode 8, a metal electrode can be formed on the transparent electrode by a plating method.

When the pixel electrode 2 and the inter-pixel electrode 8 are made of different materials, for example, when a transparent electrode is used as the pixel electrode 2 and a metal electrode is used as the inter-pixel electrode 8, the pixel electrodes 2 connected to each other are connected. It is preferable that the ends of the and the inter-pixel electrode 8 that are in contact with each other be covered with the same metal as the metal electrode forming the inter-pixel electrode 8.

FIG. 6 shows an embodiment in which a conductive layer having higher conductivity than the pixel electrode 2 is used for the connection portion 9 and the inter-pixel electrode 8, and the flow of the current C in the pixel electrode 2. When the pixel electrode 2 is formed in a substantially rectangular shape, the connection portion 9 is formed at the center of one side of the pixel electrode 2 (see (a) and (c) of FIG. 6) or over the entire width of one side of the pixel electrode 2 (see FIG. 6
(B)) or at the corner of the pixel electrode 2 (see (d) in FIG. 6).

FIG. 7 is a longitudinal sectional view showing the configuration of the arrangement of the inter-pixel electrodes 8. The pixel electrode 8 is composed of the pixel electrode 2 and the substrate 1.
7 (see FIG. 7A), the same plane as the pixel electrode 2 (see FIG.
(See (b) and (c)) or on the pixel electrode 2 (see FIG. 7D). The pixel electrode 2 and the inter-pixel electrode 8 according to the present invention may be formed by forming an electrode pattern on the substrate 1 and then etching the pixel electrode 2 and the inter-pixel electrode 8 by photolithography, or by mask evaporation. There is a method of directly forming the pixel electrode 2 and the inter-pixel electrode 8 above.

An embodiment of a method for forming the pixel electrode 2 and the inter-pixel electrode 8 for forming an organic LED display will be described with reference to the plan view of FIG. When the pixel electrode 2 and the inter-pixel electrode 8 are formed on the substrate 1, the following three methods can be used. That is, as shown in FIG. 8A, first, the pixel electrode 2 and the inter-pixel electrode 8 are simultaneously formed of, for example, a transparent electrode (left figure), and then the inter-pixel electrode made of a metal electrode is formed on the inter-pixel electrode 8. 8 again (right figure),
As shown in FIG. 8B, first, a pixel electrode 2 is formed (left figure), and then a method of forming an inter-pixel electrode 8 is shown (right figure). As shown in FIG. 8 (left figure) and then the pixel electrode 2 (right figure).

[0032]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples. Comparative Example First, patterning was performed by photolithography on a glass substrate with ITO having a thickness of 130 nm by photolithography, and the pixel electrode 2 and the inter-pixel electrode 8 composed of the ITO transparent electrode having the conventional shape shown in FIG. pitch,
It was manufactured with a width of 100 μm.

Next, the glass substrate 1 with ITO was cleaned by a conventional wet process using isopropyl alcohol, acetone and pure water in that order, and a conventional dry process by UV ozone treatment. Next, a positive resist was formed only on the pixels by photolithography. Next, this substrate was immersed in a nickel sulfamate plating solution, a current of 0.4 A was passed, and a nickel layer having a thickness of 0.4 μm was formed only on the inter-pixel electrode 8 by electrolytic plating. Next, the positive resist was immersed in a stripping solution for 5 minutes, and isopropyl alcohol, acetone,
Cleaning was performed by a conventional wet process using pure water in order and a conventional dry process by UV ozone treatment.

Next, a positive resist was applied on the substrate by spin coating to form a resist film having a thickness of 3 μm. Next, the resist was exposed using a mask to wash away the resist residue, and a partition having a width of 40 μm was formed at a pitch of 240 μm in a direction parallel to the ITO electrode and at a pitch of 130 μm in a direction perpendicular to the ITO electrode. Next, a hole injection layer having a thickness of 50 nm was formed using a 3,4-polyethylenedioxythiophene aqueous solution using a commercially available spin coater.

Next, a luminescent material emitting red, green and blue light was patterned and applied by a commercially available ink jet printer to form a luminescent layer having a thickness of 50 nm. Here, a cyanopolyphenylenevinylene precursor was used as the red light-emitting material, a polyphenylenevinylene precursor was used as the green light-emitting material, and polyparaphenylene was used as the blue light-emitting material. However, the cyanopolyphenylenevinylene precursor and the polyphenylenevinylene precursor were converted into cyanopolyphenylenevinylene and polyphenylenevinylene, respectively, by performing a heat treatment at 150 ° C. for 6 hours in an Ar atmosphere after forming the coating film. Next, using a shadow mask having a thickness of 0.2 μm, a width of 210 μm, and a pitch of 240 μm, Al and Li were co-evaporated to form an AiLi alloy electrode as a counter electrode. Finally, the organic LED element was sealed using an epoxy resin.

When a pulse voltage of 30 V was applied to the organic LED display manufactured as described above and the light emission characteristics were observed with a microscope, light emission unevenness was confirmed in the pixel.

EXAMPLE 1 First, a glass substrate 1 with ITO having a thickness of 130 nm was patterned by photolithography to form an IT having the shape according to the present invention shown in FIG.
The pixel electrode 2 composed of an O transparent electrode and the inter-pixel electrode 8
It was manufactured with a pitch of 100 μm and a width of 100 μm.

Next, the glass substrate 1 with ITO was cleaned by a conventional wet process using isopropyl alcohol, acetone and pure water in that order, and a conventional dry process by UV ozone treatment. Next, a positive resist was formed only on the pixels by photolithography. Next, the substrate 1 was immersed in a nickel sulfamate plating solution, a current of 0.4 A was passed, and a nickel layer having a thickness of 0.4 μm was formed only on the inter-pixel electrode 8 by electrolytic plating (FIG. 8 ( c) Right figure). Next, the positive resist was immersed in a stripping solution for 5 minutes, and washed by a conventional wet process using isopropyl alcohol, acetone, and pure water in that order and a conventional dry process by UV ozone treatment.

The following is the same procedure as in Comparative Example 1
When a pulse voltage of 30 V was applied to the display and the light emission characteristics were observed with a microscope, uniform light emission was obtained from all the pixels.

Example 2 An organic LED was formed in the same manner as in Example 1 except that the shapes of the pixel electrode and the inter-pixel electrode were changed to those shown in FIGS. 4 (d) and 5 (b).
An ED display 10 was manufactured. A pulse voltage of 30 V was applied to the organic LED display thus manufactured, and the light emission characteristics were observed with a microscope. As a result, uniform light emission was obtained from all the pixels.

Example 3 First, a glass substrate with ITO having a thickness of 130 nm was patterned by photolithography to form a shape according to the present invention as shown in FIGS. 4 (a) and 5 (a). The pixel electrodes 2 composed of ITO transparent electrodes and the inter-pixel electrodes 8 were formed at a pitch of 140 μm and a width of 100 μm. Next, the glass substrate 1 with ITO was cleaned by a conventional wet process using isopropyl alcohol, acetone, and pure water in that order, and a conventional dry process by UV ozone treatment.

Next, an inter-pixel electrode 8 made of aluminum was formed between the pixels by mask evaporation. Next, the glass substrate 1 with ITO was cleaned by a conventional wet process using isopropyl alcohol, acetone, and pure water in that order, and a conventional dry process by UV ozone treatment. The following is the same as in Comparative Example 1 except that the organic LE
A D display was formed.

When a pulse voltage of 30 V was applied to the organic LED display manufactured as described above, and the light emission characteristics were observed with a microscope, uniform light emission was obtained from all the pixels.

[0044]

According to the present invention, when pixel electrodes arranged in a lattice or nest on a substrate are connected by an inter-pixel electrode having a width smaller than the width of the pixel electrode, the pixel electrode and the pixel By making the connection portion of the electrode wider than the width of the inter-pixel electrode, the flow of current between the pixel electrode and the inter-pixel electrode can be made smooth. Therefore, deterioration of the element due to uneven light emission or electric field concentration in the pixel is prevented.

The pixel electrodes are arranged in a nested manner such that the corners of the pixel electrodes face the edges of the connection portions, and the corners of the pixel electrodes have a shape along the edges of the connection portions, so that the pixel electrodes and the pixels are separated. Produces a fine display by securing the shape and area necessary to smooth the flow of current between the electrodes, and making the pitch between each pixel smaller while maintaining insulation between adjacent pixel electrodes. can do.

If the corners of the pixel electrode are rounded, it is possible to suppress a decrease in light emission at the corners of the pixel.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating an organic LED element according to the present invention.

FIG. 2 is a plan view illustrating a form of connection between a pixel electrode and an inter-pixel electrode of the organic LED element of the present invention.

FIG. 3 is a plan view illustrating the flow of current between a pixel electrode and an inter-pixel electrode in FIG.

FIG. 4 is a plan view illustrating another embodiment of the connection between the pixel electrode and the inter-pixel electrode of the organic LED element of the present invention.

FIG. 5 is a plan view illustrating a form of arrangement of the pixel electrodes shown in FIGS. 4A, 4D and 4E on a substrate.

FIG. 6 is a plan view illustrating a form of a connection portion between a pixel electrode and an inter-pixel electrode and a flow of current in the pixel electrode.

FIG. 7 is a vertical cross-sectional view showing an arrangement of pixel electrodes and inter-pixel electrodes.

FIG. 8 is a plan view illustrating a method for forming a pixel electrode and an inter-pixel electrode for forming an organic LED display.

FIG. 9 is a plan view illustrating a flow of current between a conventional pixel electrode and an inter-pixel electrode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Pixel electrode 2a Corner 3 Organic LED layer 4 Counter electrode 5 Sealing substrate 6 Deflection plate 7 Partition 8 Inter-pixel electrode 9 Connection part 9a Corner 10 Organic LED element 20 Organic LED display (organic light emitting device) 91-94 Connection part 101 Area where light emission is weak 102 Area where electric field is concentrated

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noritaka Kawase 22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka Inside Sharp Corporation (72) Inventor Kimitaka 22-22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka 3K007 AB13 AB17 CA01 CA02 CA05 CB01 CC01 DA00 DB03 EB00 FA01 FA02 5C094 AA03 AA06 AA31 AA60 BA27 EA04 EA05 EB02 ED14 FB01 5F041 CA45 CA77 CA83 CA88 CA93 CA98 FF06

Claims (9)

[Claims] 1. An organic light-emitting device comprising an organic LED layer including at least one organic light-emitting layer sandwiched between a pixel electrode and a counter electrode, arranged on a substrate, and the pixel electrodes connected by inter-pixel electrodes. The pixel electrode and the inter-pixel electrode are connected to each other via a connection portion wider than the width of the inter-pixel electrode. 2. The pixel electrode according to claim 1, wherein the corners of the pixel electrode are arranged in a nested shape facing the outer edge of the connection portion, and the corners of the pixel electrode have a shape along the outer edge of the connection portion.
3. The organic light emitting device according to claim 1. 3. The organic light emitting device according to claim 1, wherein a corner of the pixel electrode is rounded. 4. The organic light emitting device according to claim 3, wherein the corners of the pixel electrode are chamfered by at least one straight line and / or curve. 5. The connection part comprises a transparent electrode only, a transparent electrode and a metal electrode, or only a metal electrode.
The organic light emitting device according to any one of the above. 6. The pixel electrode according to claim 1, wherein the pixel electrode is formed in a substantially rectangular shape, and the connection portion is formed at a central portion, an end portion, or the entire width of one side of the pixel electrode. Organic light emitting device. 7. The organic light emitting device according to claim 1, wherein the inter-pixel electrode is formed by laminating a metal electrode on a transparent electrode. 8. The organic light emitting device according to claim 1, wherein the pixel electrode is a transparent electrode, and the inter-pixel electrode is a metal electrode. 9. The organic light emitting device according to claim 7, wherein the pixel electrode includes a metal electrode in at least a part thereof.