JP2009187737A - Light-emitting device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device which realizes low resistance of electrodes to constitute an organic EL element and is easy to manufacture. <P>SOLUTION: The organic EL element 8 includes a first and a second electrode layers formed on a substrate and a light-emitting functional layer pinched by these. The second electrode layer furthermore includes a main electrode formed all over so as to cover the surface of the substrate and N pieces of auxiliary electrodes 501 (N is a positive integer) which extend respectively along a row direction. Out of these, the auxiliary electrodes are made of a material having lower electric resistance than the main electrode and at least one piece of auxiliary electrode out of the N pieces of auxiliary electrodes includes at least one fracture portion 502 on the way of its extension direction, and furthermore, the sheet resistance of the second electrode layer is a prescribed value or less. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light emitting device and an electronic device that emit light by electroluminescence.

As a thin and light-emitting source, an organic light emitting diode (OLED), that is, an organic EL (electro luminescent) element is provided. The organic EL element has a structure in which at least one organic thin film formed of an organic material is sandwiched between a pixel electrode and a counter electrode. In this case, the pixel electrode functions as, for example, an anode, and the counter electrode functions as a cathode. At the same time as a current flows between them, a current also flows in the organic thin film, whereby the organic thin film or the organic EL element emits light. In this case, since the luminance of the light emission depends on the magnitude of the current flowing in the organic thin film, it is necessary to pay sufficient attention to the control of the current, in other words, the potential setting for each of the pixel electrode and the counter electrode. is there.
If a large number of such organic EL elements are arranged and light emission and non-light emission are appropriately controlled for each of them, an image having a desired meaning can be displayed.
As such an organic EL element or an image display apparatus provided with the organic EL element, for example, one disclosed in Patent Document 1 is known.
JP 2001-296819 A

  By the way, in the image display apparatus as described above, there is a problem related to the electric resistance characteristics of the pixel electrode or the counter electrode in relation to the problem related to the current control described above. That is, since the organic EL element has a configuration in which the organic thin film is sandwiched between these two electrodes as described above, in order to guide light emitted from the organic thin film to the outside of the apparatus, the pixel electrode and the counter electrode At least one must be transparent. Therefore, at least one of them is a transparent and conductive material, such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), or silver, aluminum, gold, etc. that have been thinned until light transmission is possible Need to be made of any metal or alloy. However, these transparent conductive materials have a relatively high electrical resistance value. For this reason, it is difficult to stably set and maintain the potentials of these electrodes, and consequently to control the current to the organic thin film, or to maintain the luminance uniformity on the image display surface.

  Such a problem is particularly noticeable in a so-called top emission type image display device. Here, the top emission type is a type in which light emitted from an organic thin film in an organic EL element is guided to the outside of the apparatus toward the side opposite to the position where the substrate on which the organic EL element is formed exists. (Incidentally, the type in which the light is guided toward the substrate side is called a bottom emission type). In the case of the top emission type, for example, the counter electrode is made of the transparent conductive material, and is formed as a solid electrode as if the counter electrode covers the entire surface of the substrate. Therefore, the above-described problem of electrical resistance becomes more serious in such a counter electrode.

  Conventionally, so-called “auxiliary electrodes” are formed in order to cope with such problems. That is, in the above-described configuration example, a conductive film (that is, an auxiliary electrode) made of a relatively low resistance material is used as an upper layer or a lower layer of a relatively high resistance counter electrode and so as to avoid a light emitting region. It forms. As a result, the overall resistance value of the counter electrode provided with the auxiliary electrode can be lowered.

  However, the formation of this auxiliary electrode is difficult in itself. For example, in order to satisfy the above-mentioned condition “to avoid the light emitting region”, it is usually considered that the auxiliary electrode is preferably formed in a straight line so as to sew between the rows of the organic EL elements arranged in a matrix. However, this is quite difficult in itself. This is because, in this case, the auxiliary electrode needs to have a very fine line width, and further, it needs to be continuous in a line shape across the inter-row region. Such film formation is difficult even with a single alignment. In addition, the difficulty increases as the screen size increases.

If it is intended to avoid such difficulty, for example, as described in Patent Document 1 described above, instead of forming such a linear electrode all at once, an appropriate number of such electrodes may be used. In other words, it is considered as a collection of electrodes as parts, and by making them “a part of a plurality of electrodes overlap each other” (Claim 1 of Patent Document 1), a linear auxiliary electrode is formed. It is possible to do. However, even in this case, expansion and contraction of the vapor deposition mask occurs due to the influence of radiant heat generated during vapor deposition, and it is difficult to control the shape of each of these electrodes (for example, the auxiliary electrode to be finally formed) Is not connected linearly).
Even in the above-mentioned Patent Document 1, it is pointed out that such a problem, that is, the importance of using a “metal mask in which the accuracy of the opening does not change even when subjected to radiant heat” ([0006] of Patent Document 1), In order to avoid such a problem, Patent Document 1 discloses a technique of “forming the plurality of electrode lines by translating a pattern-processed pattern mask ...” (claims of Patent Document 1). 3] etc. or [FIG. 2] to [FIG. 4] etc.). However, there are problems with this technology. That is, in this technique, since one mask is used for at least two times of vapor deposition, for example, when the mask is contaminated by the first vapor deposition, the contamination is caused on the substrate side by the second vapor deposition. This is because it can be transferred.

  The present invention has been made in view of the above-described problems, and light emission capable of solving some or all of the above-mentioned problems centering on the reduction in resistance of electrodes constituting the light-emitting elements. It is an object to provide an apparatus and an electronic device.

  In order to solve the above-described problems, a light-emitting device of the present invention includes a substrate and light-emitting elements arranged on the substrate according to a matrix arrangement, and the light-emitting elements are first and first elements formed on the substrate. The second electrode layer further includes a main electrode formed so as to cover the surface of the substrate, and each of the second electrode layers is in direct contact with the main electrode. N auxiliary electrodes (N is a positive integer) extending between the light emitting elements arranged in accordance with the matrix arrangement, the auxiliary electrodes being in comparison with the main electrodes The second electrode is made of a material having a lower electrical resistance, and at least one of the N auxiliary electrodes has at least one broken portion in the extending direction thereof. The sheet resistance of the layer is a predetermined value It is below.

According to the present invention, the second electrode layer constituting the light emitting element includes the main electrode and N auxiliary electrodes as described above. Here, “N” preferably corresponds to, for example, the number of rows of the light emitting elements, but may match the number appropriately thinned therefrom (that is, the number of rows of the matrix arrangement is A). If it is, A> N may be sufficient.)
In the present invention, at least one of the N auxiliary electrodes has at least one broken portion in the middle of the extending direction. Therefore, in the at least one auxiliary electrode, the movement of charges is not performed smoothly unlike the other auxiliary electrodes.
However, in the present invention, the sheet resistance of the second electrode layer is not more than a predetermined value. Here, the “predetermined value” means, for example, “a value for all the light emitting elements to emit light with a predetermined luminance or higher”, “a current of a predetermined magnitude or more in the light emitting functional layer included in all of the light emitting elements. Can be paraphrased or defined as “a value for flowing a current” or “a value for causing a voltage applied between the first and second electrode layers to be equal to or higher than a barrier voltage of the light emitting functional layer”. In these cases, when the second electrode layer is viewed as a whole, the potential setting can be suitably performed, so that the current control in the light emitting element can be suitably performed (Note that the “barrier voltage” referred to above) (Refer to FIG. 9A described later and the description in the embodiment related thereto).

From the above, the following can be said. That is, while the current control in the light emitting element is suitably performed, the auxiliary electrode that backs up behind the scenes may have a “breaking portion”. As described above, the fracture portion is inhibited from charge transfer and does not become smooth. However, the inventor of the present application has found that such a broken portion is allowed when the sheet resistance is equal to or less than the predetermined value. The fact that this is allowed means that it is not always necessary to form all of the N auxiliary electrodes as electrodes having a strictly continuous linear shape. In other words, in the present invention, the auxiliary electrode is manufactured by a manufacturing method that does not need to pay particular attention to the problems such as the deformation of the vapor deposition mask due to radiant heat or the contamination due to the reuse of one mask as described above. It can be done. This naturally increases the manufacturability of the light emitting device.
As described above, according to the present invention, according to the provisions relating to “sheet resistance”, the current control optimization of the light emitting element or the brightness maintenance thereof is ensured by the presence of the “breaking portion”, respectively. The demands that are related to each other will be satisfied at the same time.
The above items will be described with more specific numerical values and the like in the embodiments described later.

In the light emitting device of the present invention, the auxiliary electrode may be arranged so as to extend along a row direction of the light emitting element.
According to this aspect, one of the optimal formation aspects of the auxiliary electrode is provided.
Note that the “row direction” in this aspect means any one of the vertical direction and the horizontal direction conceived in the “matrix-like arrangement”. In this case, for example, if the horizontal direction of the “matrix-like arrangement” is meant to be “row”, the vertical direction is “column”, but if this is rotated 90 degrees, the previous horizontal direction (ie, “Row”) becomes the “column” in the vertical direction, and the previous vertical direction (ie, “column”) becomes the “row” in the horizontal direction. In short, “row” and “column” are relative concepts in the meaning just described, and in that sense, “row” in this aspect can be rephrased as “column”.

In the light emitting device of the present invention, the predetermined value is 1 [Ω / sq. It may be configured as follows.
According to this aspect, since the sheet resistance of the second electrode layer is suppressed to be relatively low, the current control in the light emitting element is performed extremely favorably in addition to the above. Note that the notation “1 [Ω / sq.]” In the present embodiment strictly means not only “1 [Ω / sq.]” But also various theoretical estimations and various environments. It also implies a value within a certain range (that is, 1 ± α [Ω / sq.]) Whose existence should naturally be expected by fluctuations in physical properties or technical common sense.

Further, in the light emitting device of the present invention, the ratio of the area of the broken portion on the surface of the substrate to the area of the formation region of the auxiliary electrode including the broken portion is less than 50%. You may comprise.
This aspect provides one of the optimal examples from the viewpoint of maintaining a balance between the optimization of the current control of the light emitting element and the improvement of the manufacturability. That is, the inventor of the present application has found that it is difficult to control the current of the light-emitting element if the “50 [%]” regulation as described above is not satisfied. This point will be touched on later in the description of the embodiment.
As described above, the N auxiliary electrodes may be formed by being thinned out appropriately (that is, N <A (= the number of light emitting element rows)), but in this case, as in the present embodiment It is considered that there is a restriction based on the above (that is, the “amount” of the fractured portion should not be too large compared to the “amount” of the auxiliary electrode excluding it).

The light emitting device of the present invention may further include a power supply line electrically connected to the second electrode layer on the substrate.
According to this aspect, the potential setting for the second electrode layer is preferably performed through the power supply line.

In this aspect, the main electrode may have a substantially quadrilateral shape in plan view, and the power supply line may have a portion facing each of two opposite sides of the main electrode.
According to this aspect, since the power supply line having a portion facing the two sides of the main electrode having a substantially quadrilateral shape is provided, the power supply line for supplying power to the second electrode layer is the most suitable aspect. It can be said that one is taken.
However, such an aspect simultaneously separates the distance from the power supply line to the central portion of the main electrode to a considerable extent, making it more difficult to maintain the potential of the entire main electrode. However, in the present invention, even in such a case, if the above-described N auxiliary electrodes having broken portions exist, the two effects of optimizing the current control of the light emitting element and improving the manufacturability are achieved. Is played unchanged. Conversely, it can be said that the effect of the present invention can be enjoyed more effectively only in such an aspect.

In the light emitting device of the present invention, the main electrode may be made of a transparent conductive material.
According to this aspect, since the main electrode is made of a transparent conductive material, light emitted from the light emitting element can be taken out of the apparatus so as to transmit the main electrode.
In addition, the transparent conductive material is normally expected to have a relatively high resistance. However, even in this case, if the N auxiliary electrodes having the broken portions described above are present, the current of the light emitting element can be reduced. The two effects of optimizing control and improving manufacturability remain unchanged. Conversely, it can be said that the effect of the present invention can be enjoyed more effectively only in such an aspect.

On the other hand, in order to solve the above problems, an electronic apparatus according to the present invention includes the above-described various types of light emitting devices.
Since the electronic apparatus of the present invention includes the various light emitting devices described above, it is possible to display a high-quality image such as uniform brightness on the image surface, and the manufacture thereof is easy.

  Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 1 to 5. It should be noted that in these drawings and each drawing after FIG. 6 referred to later, the ratio of the dimensions of each part, the distance between the elements, and the like may be appropriately different from the actual ones.

FIG. 1 is a plan view showing an example of the organic EL device (light emitting device) of the present embodiment.
In FIG. 1, the organic EL device includes an element substrate 7 and various elements formed on the element substrate 7. Here, the various elements are the organic EL element 8, the scanning line 3 and the data line 6, the scanning line driving circuits 103A and 103B, the data line driving circuit 106, the precharge circuit 106A, and the counter electrode power supply line 201.

As shown in FIG. 1, a plurality of organic EL elements (light emitting elements) 8 are provided on an element substrate 7, and the plurality of organic EL elements 8 are arranged in a matrix. Each of the organic EL elements 8 includes a pixel electrode, a light emitting functional layer, and a counter electrode. Among these, the counter electrode is provided with an auxiliary electrode for assisting its function. Each of these elements will be discussed later.
The image display area 7 a is an area where the plurality of organic EL elements 8 are arranged on the element substrate 7. In the image display area 7 a, a desired image can be displayed based on individual light emission and non-light emission of each organic EL element 8. Hereinafter, the area excluding the image display area 7a on the surface of the element substrate 7 is referred to as a “peripheral area”.

  The scanning lines 3 and the data lines 6 are arranged so as to correspond to the respective rows and columns of the organic EL elements 8 arranged in a matrix. More specifically, as shown in FIG. 1, the scanning line 3 extends in the left-right direction in the drawing and is connected to scanning line driving circuits 103A and 103B formed on the peripheral region. On the other hand, the data line 6 extends along the vertical direction in the drawing and is connected to the data line driving circuit 106 formed on the peripheral region. A unit circuit (pixel circuit) P including the organic EL element 8 and the like described above is provided in the vicinity of each intersection of the scanning lines 3 and the data lines 6.

As shown in FIG. 2, the unit circuit P includes the organic EL element 8 described above, and also includes an n-channel first transistor 68, a p-channel second transistor 9, and a capacitor element 69.
The unit circuit P receives power from the current supply line 113. The plurality of current supply lines 113 are connected to a power source (not shown).
The source electrode of the p-channel type second transistor 9 is connected to the current supply line 113, and the drain electrode thereof is connected to the pixel electrode of the organic EL element 8. A capacitive element 69 is provided between the source electrode and the gate electrode of the second transistor 9. On the other hand, the gate electrode of the n-channel first transistor 68 is connected to the scanning line 3, its source electrode is connected to the data line 6, and its drain electrode is connected to the gate electrode of the second transistor 9.
In the unit circuit P, when the scanning line driving circuits 103A and 103B select the scanning line 3 corresponding to the unit circuit P, the first transistor 68 is turned on, and the data signal supplied via the data line 6 is transferred to the internal circuit P. It is held in the capacitor element 69. Then, the second transistor 9 supplies a current corresponding to the level of the data signal to the organic EL element 8. As a result, the organic EL element 8 emits light with a luminance corresponding to the level of the data signal.

On the peripheral region on the element substrate 7, a precharge circuit 106A is provided. The precharge circuit 106A is a circuit for setting the data line 6 to a predetermined potential prior to a data signal write operation to the organic EL element 8.
The counter electrode power supply line 201 (hereinafter simply referred to as “power supply line 201”) has a square shape in plan view so as to substantially follow the outline of the element substrate 7. The power supply line 201 supplies a power supply voltage such as a ground level to the counter electrode of the organic EL element 8.
In the above description, an example in which all of the scanning line driving circuits 103A and 103B, the data line driving circuit 106, and the precharge circuit 106A are formed on the element substrate 7 has been described. Or a part may be formed in a flexible substrate. In this case, by providing appropriate terminals at both contact portions between the flexible substrate and the element substrate 7, electrical connection between the two can be achieved.

  An organic EL device having the above-described configuration when viewed in plan includes a stacked structure 250 as shown in FIG. As shown in FIG. 3, the stacked structure 250 includes a circuit element thin film 11, a first interlayer insulating film 301, a reflective layer 34, a second interlayer insulating film 302, The pixel electrode 13, the light emitting functional layer 18, the counter electrode 5, and the auxiliary electrode 501 are included.

Among these, the first and second interlayer insulating films 301 and 302 (hereinafter, simply referred to as “insulating films 301 and 302”) may prevent a short circuit between other conductive elements, or This contributes to realizing a suitable arrangement of the conductive elements in the laminated structure 250. Although these insulating films 301 and 302 can be made of various insulating materials with various thicknesses, it is preferable that the insulating films 301 and 302 are appropriately selected according to the arrangement position and role of each insulating film in the laminated structure 250. A suitable thickness and material may be selected.
More specifically, for example, the insulating films 301 and 302 are preferably made of SiO ₂ , SiN, SiON, or the like.

  The circuit element thin film 11 includes the first transistor 68 and the second transistor 9 included in the unit circuit P described above. Although the circuit element thin film 11 is drawn in a very simplified manner in the figure, the circuit element thin film 11 is composed of a semiconductor layer, a gate insulating film, a gate metal, etc. constituting these various transistors and an electrode thin film (capacitor element 69). (Not shown) and other metal thin films. In addition, in the laminated structure 250 shown in FIG. 3, the scanning line 3 and the data line 6 are naturally constructed, but the illustration thereof is omitted.

  On the other hand, each of the aforementioned organic EL elements 8 is composed of the pixel electrode 13, the light emitting functional layer 18, and the counter electrode 5 among the above-described various elements constituting the laminated structure, as shown in FIG. .

Among these, the pixel electrodes 13 are formed on the element substrate 7 so as to be arranged in a matrix. The fact that the organic EL elements 8 are arranged in a matrix corresponds to the fact that the pixel electrodes 13 are arranged in a matrix as described above (see FIGS. 1 and 3).
The pixel electrode 13 is electrically connected to the circuit element thin film 11 through the contact hole 360. Thereby, the pixel electrode 13 can apply the current supplied from the current supply line 113 to the light emitting functional layer 18 via the second transistor 9 shown in FIG. The contact hole 360 is formed so as to penetrate through the first and second interlayer insulating films 301 and 302.
The pixel electrode 13 is made of a light-transmitting and conductive material such as ITO (Indium Tin Oxide).

The reflective layer 34 is formed on the first interlayer insulating film 301 and below the second interlayer insulating film 302 so as to correspond to the formation region of the pixel electrode 13. The reflection layer 34 reflects the light emitted from the light emitting functional layer 18 as shown in FIG. This reflected light travels upward in the figure (see arrow in FIG. 3). Thus, the organic EL device according to this embodiment is a so-called top emission type. From this, the element substrate 7 may be made of an opaque material such as ceramics or metal (in contrast, in the case of the bottom emission type, the element substrate 7 is made of a translucent material. There is a need.).
Such a reflective layer 34 is preferably made of a material having a relatively high light reflection performance in order to better exhibit the above-described reflection function. For example, a metal such as aluminum or silver can be used.

On the other hand, as shown in FIG. 3 or FIG. 4, the partition wall (bank) 340 is formed in a region between the adjacent pixel electrodes 13 in plan view among the above-described pixel electrodes 13. The actual height of the partition wall 340 in the vertical direction in FIG. 3 is approximately 1 to 2 μm. The partition 340 plays a role of partitioning each organic EL element 8.
Such a partition 340 is preferably made of, for example, an insulating transparent resin material, particularly a material having liquid repellency. More specifically, for example, fluorine resin, or acrylic resin, epoxy resin, polyimide or the like can be used.
In addition, when the partition 340 is made of such various resin materials, the base layer may be made of an inorganic material such as SiO ₂ (that is, in this case, the partition 340 is on the lower layer side). It has a laminated structure of an inorganic substance and an organic substance on the upper layer side.) According to this, even when the pixel electrode 13 is made of ITO or the like as described above, the adhesion between the pixel electrode 13 and the partition wall 340 can be improved.

The light emitting functional layer 18 is formed on the pixel electrode 13 as shown in FIG. The light emitting functional layer 18 includes at least an organic light emitting layer, and the organic light emitting layer is composed of an organic EL material that emits light by combining holes and electrons. When the organic EL material is, for example, a polymer material, the organic EL material is supplied only within each space partitioned by the partition wall 340 (that is, for each pixel) by, for example, a droplet coating method (inkjet method). Is done.
As described above, according to the aspect in which the organic EL material is supplied only to the space partitioned by the partition wall 340, the light emitting functional layer 18 can be provided separately for each color as shown in FIG. FIG. 4 shows an example in which the light emitting functional layers 18R, 18G, and 18B including organic EL materials dedicated for red light, green light, and blue light are formed in this order along the horizontal direction in the drawing. . Note that along the vertical direction in the figure, there are arranged a row in which only the light emitting functional layers 18R are arranged, a row in which only the light emitting functional layers 18G are arranged, and a row in which only the light emitting functional layers 18B are arranged.
As other layers constituting the light-emitting functional layer 18, part or all of an electron block layer, a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, and a hole block layer may be provided.

As shown in FIG. 3, the counter electrode 5 is in contact with the light emitting functional layers 18 of the plurality of organic EL elements 8. That is, the counter electrode 5 extends over the area of the light emitting functional layer 18 defined by the partition 340 and the partition 340 so as to be common to the plurality of pixel electrodes 13.
The counter electrode 5 is formed in a rectangular shape as if it covers the entire surface of the element substrate 7 in plan view (a so-called solid shape having no special opening, gap, or the like therein). The periphery of the counter electrode 5 is electrically connected to the power supply line 201 shown in FIG. 1 (the connection mode is not shown). Since the power line 201 has a square shape in plan view as described above, and the counter electrode 5 has a rectangular shape, the latter is formed so as to enter the region surrounded by the former “Π” character. The In this case, the two leg portions of the character are opposed to both sides of the counter electrode 5.
In this embodiment, the counter electrode 5 is a cathode and the pixel electrode 13 is an anode, but the opposite may be possible.
Such a counter electrode 5 is made of a translucent and conductive material such as ITO (Indium Tin Oxide).

In addition to the above configuration, the organic EL device according to this embodiment particularly includes an auxiliary electrode 501.
As shown in FIG. 3, the auxiliary electrode 501 is formed on the counter electrode 5 positioned on the partition wall 340. As is clear from FIG. 3, the auxiliary electrode 501 is formed directly on the counter electrode 5, so that the entire lower surface (surface in contact with the counter electrode 5) of the auxiliary electrode 501 is the counter electrode. It can be seen that it consists of a set of contacts between the top surface in FIG. In short, the electrical communication between the two is almost perfect.

  The shape of the auxiliary electrode 501 in a plan view is substantially rectangular as shown in FIG. 4 or FIG. However, the length of the short side of the substantially rectangular shape is extremely shorter than the length of the long side. Therefore, the auxiliary electrode 501 has a shape that can be almost called “linear”. There are a plurality of such linear auxiliary electrodes 501 as shown in FIG. 4 or FIG. 5, and a plurality of such auxiliary electrodes 501 are sewn in each region between the organic EL elements 8 arranged adjacent to each other in the vertical direction in the figure. Extend. Then, one ends of the plurality of auxiliary electrodes 501 reach the power supply line 201 as shown in FIG. 4 or FIG.

Each of the plurality of auxiliary electrodes 501 has a fractured portion 502 in the middle of its extending direction, as shown in FIG. 4 or FIG. In the present embodiment, one broken portion 502 is provided for each of the three organic EL elements 8 as shown particularly well in FIG. Note that the “three organic EL elements 8” herein include the light emitting functional layers 18R, 18G, and 18B including organic EL materials dedicated to red light, green light, and blue light, respectively, as described above. Therefore, if such three organic EL elements 8 are grouped and are specifically referred to as “one pixel” in the present embodiment, one broken portion 502 according to the present embodiment is provided for each pixel. It can be said that.
The length t of the fractured portion 502 along the extending direction of the auxiliary electrode 501 can be specifically determined in various ways, which will be described later.

The auxiliary electrode 501 as described above is preferably made of a material having a resistance value lower than that of the counter electrode 5, more specifically, aluminum, silver, gold, copper, or the like. Each electric resistance value (specific resistance) is 2.62 [μΩ · cm], 1.62 [μΩ · cm], 2.4 [μΩ · cm], and 1.69 [μΩ · cm]. Is extremely low.
Further, each numerical value that specifically defines the shape of the auxiliary electrode 501 according to the present embodiment is preferably determined as follows. That is, the width W (see FIG. 4) is about 10 to 50 μm, and the height T (see FIG. 3) is about 100 to 500 nm. Note that the former width W actually depends on how much the distance WA between the organic EL elements 8 adjacent in the vertical direction in the figure is set, as can be seen from FIG. Usually, the latter “distance WA” is determined, and then the former “width W” is preferably determined. However, if the width W is 30 nm, the distance WA is about 50 nm. (In other words, the distance from the both ends of the auxiliary electrode 501 to the end of the organic EL element 8 facing each of the auxiliary electrodes 501 may be set to about 15 nm (= (WA−W) / 2)). Thus, the reason for WA> W is that it is necessary to consider the position tolerance related to the formation process of the auxiliary electrode 501.

  The integration of the auxiliary electrode 501 and the counter electrode 5 described above corresponds to a specific example of “second electrode layer” in the present invention. The integral of the auxiliary electrode 501 and the counter electrode 5 according to the present embodiment has a sheet resistance of 1 [Ω / sq. It is as follows.

According to the organic EL device having the above configuration, the following effects are exhibited.
(1) First, in the organic EL device of the present embodiment, as described above, the integral sheet resistance of the counter electrode 5 and the auxiliary electrode 501 is 1 [Ω / sq. Therefore, the setting of the potential via the power line 201 is performed relatively stably. Since the potential of the counter electrode 5 affects the setting of the potential difference with respect to the pixel electrode 13 and consequently the current flowing through the light emitting functional layer 18, the current control of the organic EL element 8 or the The emission luminance can be controlled very stably.
Needless to say, the existence of the auxiliary electrode 501 greatly contributes to the background of realizing such a relatively low sheet resistance value. However, since the auxiliary electrode 501 according to the present embodiment has the broken portion 502 as described above, the situation is not so simple. Including this point, the relationship between the layout of the auxiliary electrode 501 and the broken portion 502 and the sheet resistance will be described later.

(2) Moreover, in the organic EL device of the present embodiment, the effect that the manufacture (particularly, formation of the auxiliary electrode 501) is extremely easy is enjoyed. This is because the auxiliary electrode 501 has or may have the fracture portion 502. Such an effect is provided when the auxiliary electrode 501 has to have a continuous linear shape over the entire region sandwiched between the power supply lines 201 shown on the left and right of FIG. 5 (see FIG. 8). This figure will be described later). In this case, the auxiliary electrode 501 is manufactured, for example, by forming all the lines of the auxiliary electrode 501 at once, or forming a part of the auxiliary electrode 501 and then overlapping some other end with the other end. The other part is formed as follows (hereinafter, if necessary, this is repeated) and so on. However, the former method is almost impractical, and the latter method also has problems such as deformation due to radiant heat of the vapor deposition mask as described above (see the above [Invention to solve) Refer to the section entitled “Problems to be addressed”).
However, in the present embodiment, the fracture portion 502 may be positively provided. In other words, the auxiliary electrode 501 can be manufactured very roughly compared to the above-described methods.
For this reason, the organic EL device of the present embodiment has extremely high manufacturability. On the other hand, when the organic EL device is mass-produced, the yield is extremely improved.

In the organic EL device according to the present embodiment, the auxiliary electrode 501 includes, for example, auxiliary electrode pieces (in the auxiliary electrode 501, two auxiliary electrodes 501 positioned in the first, third, fifth, and so on columns from the left in FIG. 5). A first mask having an opening for forming a rupture portion 502 (or a portion sandwiched between one rupture portion 502 and the power supply line 201). And a vapor deposition method such as a CVD (Chemical Vapor Deposition) method using a second mask having openings for forming auxiliary electrode pieces located in the second, fourth, sixth,... Rows. Can be manufactured.
In this case, the above-described improvement in manufacturability includes that it can be enjoyed in the sense that it is not necessary to strictly set the relative positional relationship between the first mask and the second mask. If two masks are used in this way, there is also an effect that there is no need to worry about transfer of contamination which is a concern when one mask is reused.

  According to the organic EL device of the present embodiment, the effects as described above can be obtained. In the following, supplementary matters regarding this will be described with reference to FIGS. 6 to 8 (<Example 1>, <Comparative Example 1>, and Each corresponds to <Comparative Example 2>), and will be described with reference to FIG.

<Example 1>
First, as shown in FIG. 6, when the auxiliary electrode 501 has a length corresponding to 1/3 of its entire length and has a broken portion 501A for breaking the central portion of the auxiliary electrode 501, the counter electrode The sheet resistance of 5 was measured by experiment. At this time, the following assumptions are made. That is, the size of the image display area 7a is 2 inches (note that the length in the vertical direction in FIG. 6 or the length of the image display area 7a in the extending direction of the power line 201 is 48 mm), and the resolution is QVGA (Quarter Video). Graphics Array: 320 × 240 pixels), the counter electrode 5 is made of MgAg (magnesium / silver) with a composition weight ratio of 10: 1, the film thickness is 10 nm, and the auxiliary electrode 501 is made of the material Aluminum, the aforementioned width W is 15 μm, and the thickness T is 400 nm.
Under this assumption, the sheet resistance of the counter electrode 5 when the auxiliary electrode 501 is not provided is 4.15 [Ω / sq. ] (Theoretical value).

In the case of FIG. 6, the sheet resistance of the counter electrode 5 is 0.815 [Ω / sq. ] (Theoretical value).
In this case, in FIG. 6, the organic EL elements 8 located at the left end and the right end and the periphery thereof emit light with a luminance sufficient to be visually recognized, but the organic EL element 8 located at the central portion of the element substrate 7 It was confirmed that the luminance was slightly reduced.

  As described above, even if the length t (see FIG. 5) of the fracture portion is a relatively large value corresponding to 1/3 of the total length of one auxiliary electrode 501 as shown in FIG. Light emission with a proper luminance can be performed.

<Comparative Example 1>
Next, as shown in FIG. 7, when the auxiliary electrode 501 has a fractured portion 501B having a length corresponding to 2/3 of the total length, the sheet resistance of the counter electrode 5 was calculated by experiment. . However, as can be seen from FIG. 7, the “breaking portion 501 </ b> B” is composed of two portions per one auxiliary electrode 501, and each of them immediately starts from one side end of both power supply lines 201. The length of each broken portion 501B corresponds to 1/3 of the total length of the auxiliary electrode 501 as in the case of the broken portion 501A.
Further, the auxiliary electrode 501 having the broken portion 501B does not have a portion that is directly connected to the power supply line 201. In other words, in FIG. 7, the auxiliary electrode 501 is formed in a state as if floating in the central portion of the element substrate 7 when viewed from the power supply lines 201 on both sides.
The preconditions such as the size of the image display area 7a are the same as in the above <Example 1>.

In the case of FIG. 7, the sheet resistance of the counter electrode 5 is 1.36 [Ω / sq. ] (Theoretical value).
In addition, in this case, it was confirmed that none of the organic EL elements 8 shown in FIG. 7 emits light with sufficient luminance (in the figure, such a situation is caused by painting the organic EL elements 8 black). It is expressed.)

<Comparative Example 2>
Next, when the auxiliary electrode 501 does not have a fracture part at all as shown in FIG. 8, the sheet resistance of the counter electrode 5 is calculated by experiments. That is, the conventional mode is assumed.
The preconditions such as the size of the image display area 7a are the same as in the above <Example 1>.

In the case of FIG. 8, the sheet resistance of the counter electrode 5 is 0.58 [Ω / sq. ] (Theoretical value).
Further, in this case, it was naturally confirmed that any of the organic EL elements 8 shown in FIG. However, as already described, it is more difficult to form the auxiliary electrode 501 having no broken portion as shown in FIG. 8 than in FIGS.

  From FIG. 6 to FIG. 8 described above, first, in the organic EL device according to the present embodiment, the counter electrode 5 or the auxiliary electrode is also provided by the presence of the auxiliary electrode 501 having the broken portion (501A, 501B, or 502). It is confirmed that the sheet resistance of the entire electrode 501 can be suppressed to a certain level. However, in this case, the so-called “amount” of the broken portion is a problem. That is, when the “amount” becomes a certain level or more, the above-described effect (1) cannot be obtained as much as expected. It is clear that the limit is between the results of FIG. 6 and FIG.

  Here, the “quantity” described in comparison here is more precisely, “the fracture portion of the area of the fracture portion (501A, 501B, or 502) occupying the surface of the element substrate 7”. It can be defined as “a ratio to the area of the formation region of the auxiliary electrode 501 including“. This ratio is about 33.3 [%] in FIG. 6 and about 66.7 [%] in FIG. 7, so that the limit can be derived to be approximately 50 [%]. Is possible.

  Alternatively, it is possible to set a suitable limit value for the value of the sheet resistance itself by directly viewing the value of the sheet resistance as a result of FIGS. 6 and 7. That is, in FIG. 6, 0.815 [Ω / sq. In FIG. 7, 1.36 [Ω / sq. Therefore, the limit is approximately 1 [Ω / sq. ] Can be derived. In the above embodiment, the sheet resistance of the counter electrode 5 is 1 [Ω / sq. ] The following is based on the above points. Incidentally, in order to realize a lower sheet resistance, it is considered that the arrangement mode of the fracture portion 502 in the above embodiment is more favorable than that of the fracture portion 501A shown in FIG.

Alternatively, it is also possible to define “limits” having the same meaning as described above in a more general form based on the concept described below.
That is, in FIGS. 6 to 8 or FIG. 5 of the above-described embodiment, the influence of the high resistance of the counter electrode 5 is that the organic EL element 8 located farther from the power supply line 201 is closer. It can be said that it receives larger than that located in. Therefore, in FIG. 6 and the like, the organic EL element 8 farthest from the power supply line 201 (in FIG. 6 and the like, the organic EL element 8 on the center line of the element substrate 7 running in the vertical direction of the drawing corresponds to this. For convenience, the potential E1 of the counter electrode 5 where the “farthest element 8” may be located will be noted. In this case, if the potential in the power supply line 201 is E0, this E1 is
E1 = E0−ri (1)
It can be expressed as. Here, r is the electrical resistance between the farthest element 8 and the power supply line 201, and i is the current value.
Now, if the potential E0 is set to the counter electrode 5 that constitutes a certain organic EL element 8, as shown in FIGS. 9A and 9B, the luminance of the organic EL element 8 is L0 [cd / m ² ] and the current efficiency is a [cd / A], the above equation (1) is
E1 = E0−r (L0 / a) (1 ′)
It can be rewritten as The current efficiency a corresponds to the slope of a straight line representing the relationship (proportional relationship) between the current flowing through the organic EL element 8 and the luminance (that is, a = (L0 / i). FIG. )reference).
If this equation (1 ′) is transformed,
r = a (E0−E1) / L0 (2)
It becomes.

In this formula (2), a relationship is established between L0 and E0 that the former is determined if the former is arbitrarily determined, and the former is determined if the latter is arbitrarily determined. On the other hand, E1 can be determined based on, for example, that the luminance to be achieved by the farthest element 8 (hereinafter referred to as “desired luminance”) is determined with reference to the L0. If the desired luminance L * is determined in FIG. 9B, the current I * to be passed through the farthest element 8 is determined, and this I * and FIG. It seems that E1 is determined.
In any case, since E1, L0, and E0 can be acquired as default values, r is determined by Equation (2). If r is determined, the sheet resistance of the counter electrode 5 can be obtained by appropriately converting it.

As described above, the “limit” having the same meaning as described above can be determined in a more general form based on determining the desired luminance L *. In this case, E1, E0, L0, and a are preferably determined based on the actual organic EL element 8. Further, in this case, there is a difference in characteristics between the organic EL elements 8 with respect to the organic EL element 8 itself or a driving transistor (see the second transistor 9 in FIG. 2) for supplying a current to the organic EL element 8. obtain. Therefore, in determining the specific values of these variables, it is preferable to consider differences in characteristics.
Note that the potential Ef illustrated in FIG. 9A represents an example of the “barrier voltage” described in the above section [Means for Solving the Problems].

In addition to the above, in order to make all the organic EL elements 8 emit light appropriately, it is also conceivable to directly set the length t (see FIG. 5) of the fractured part based on a finer viewpoint. In setting the length t, the following points should be considered.
In other words, the preferred value that the length t should take is affected by the definition of the image display area 7a. For example, assuming that t = T1 (= constant), the same t is applied to an organic EL device having a definition of 100 [ppi (pixel per inch)] and a resolution of 300 [ppi]. In the latter case, in general, the number of pixels that can be included in the area of the disconnected portion (that is, the area of the length T1) is larger. In this case, there is no particular problem in the former case, but in the latter case, a problem may occur in the light emission of the organic EL element 8 located near the center of the region of the length T1. From the above, a criterion can be derived that the higher the definition, the smaller the length t is preferable.

As mentioned above, although embodiment concerning this invention was described, the light-emitting device concerning this invention is not limited to the form mentioned above, Various deformation | transformation are possible.
(1) In each of the above embodiments, a description has been given of a mode in which one broken portion 502 of the auxiliary electrode 501 is formed for each pixel, but the present invention is not limited to such a mode. The “auxiliary electrode” or “broken portion” according to the present invention can take various forms as shown in FIGS. 10 to 12, for example.

(1-i) In FIG. 10, the broken portions 503 are arranged in a checkered pattern.
More specifically, for example, when looking at the uppermost auxiliary electrode 501 in the figure, the auxiliary electrode 501 does not have a broken portion 503 for the first pixel in order from the left end portion, and for the next one pixel. The rupture portion 503 has a broken portion 503, and the next one pixel does not have a rupture portion 503. On the other hand, with respect to the second auxiliary electrode 501 from the top in the figure, the appearance pattern of the breakage portion 503 along the extending direction is opposite to the above case (that is, the breakage portion 503 is formed for each pixel. Mochi, mochi, mochi, etc ...).
Thereafter, the auxiliary electrode 501 in the third, fifth, seventh,. The electrode 501 is the same as the second auxiliary electrode 501 from the top in the drawing.
From the above, the broken portions 503 appear to be arranged in a checkered pattern.

Even if it is such a form, the effect which is not essentially different from the effect show | played by the said embodiment is still changed.
In addition, in this aspect, since the area occupied by the fractured portion 503 is larger than in the case of the above-described embodiment, the mask for forming this can have a simpler configuration. In other words, the auxiliary electrode 501 having the fractured portion 503 according to this aspect can be manufactured relatively easily even by performing vapor deposition using only one mask once. That is, it is not always necessary to perform the vapor deposition using the two masks described above. Therefore, the manufacturability of the organic EL device is further enhanced.

(1-ii) In FIG. 11, the auxiliary electrode 501 has the broken portion 503 as in the case of FIG. 10 described above.
However, in FIG. 11, in addition to this, an auxiliary electrode 504 is formed. As shown in the figure, the auxiliary electrode 504 has a substantially rectangular shape whose longitudinal direction coincides with the extending direction of the power supply line 201. The auxiliary electrodes 504 are disposed between the organic EL elements 8 adjacent to each other along the row direction (or more precisely, between the pixels). Note that the auxiliary electrode 504 and the auxiliary electrode 501 are not connected, and there is a gap (or may be) between them.
Such an auxiliary electrode 504 is included as one element constituting the “second electrode layer” in the present invention.

Even if it is such a form, the effect which is not essentially different from the effect show | played by the said embodiment is still changed.
In addition, in this aspect, in the case of FIG. 11, the resistance reduction of the counter electrode 5 can be more effective than in the case of FIG. This is due to the following circumstances.
That is, in the case of FIG. 11, the area occupied by the fractured portion 503 is larger than in the case of the above-described embodiment. Therefore, as can be understood from the description regarding FIG. 6 and FIG. There is a possibility that the effect is reduced to a certain extent. However, in the embodiment of FIG. 11, the auxiliary electrode 504 can play the role of compensating for the decrease. Therefore, in the case of FIG. 11, the resistance reduction of the counter electrode 5 can be more effective than in the case of FIG.

In FIG. 11, for example, in the vicinity of the lower left corner of the drawing, the left end and the right end of the auxiliary electrode piece located at the bottom row and the leftmost in the drawing are respectively opposed to the lower ends of the two auxiliary electrodes 504 in the drawing. The upper end of each auxiliary electrode 504 in the figure is opposed to the right end of the auxiliary electrode piece located in the second row and the leftmost row from the bottom of the figure, and the left end of the auxiliary electrode piece adjacent to the right. It is supposed to be.
This means that the length of one auxiliary electrode piece is larger than the length of one broken portion 503. Therefore, in this case, the area occupied by the entire broken portion 503 is less than ½ in the entire area of the auxiliary electrode 501 including the broken portion 503. That is, the embodiment shown in FIG. 11 is one of the preferred specific examples that satisfy the “ratio is less than 50%” according to the present invention.
The above also applies to FIG. 10 and FIG. 12 described later.

(1-iii) In FIG. 12, the broken portions 505 are arranged in a checkered pattern similar to the broken portion 503 in FIG.
However, in FIG. 12, the broken portion 505 has a length corresponding to approximately 2 pixels. In addition, the portion of the auxiliary electrode 501 excluding the broken portion 505 has a length corresponding to about 2 pixels. However, the former length is smaller than the latter length. That is, the mode shown in FIG. 12 is also one of the preferable specific examples that satisfy “the ratio is less than 50%” (see the explanation about “auxiliary electrode piece” in FIG. 12 and FIG. 11 in comparison).

Even if it is such a form, the effect which is not essentially different from the effect show | played by the said embodiment is still changed.
In addition, in this aspect, since the area occupied by the fractured portion 505 is increased as compared with the case of FIG. 10 described above, the mask for forming this can have a simpler configuration. More specifically, in this case, the formation density of the opening in the mask (the opening corresponds to the auxiliary electrode 501 formation region other than the fractured portion 505) is higher in the case of FIG. 12 than in the case of FIG. Compared to FIGS. 12 and 10, “the formation density” means (the number of openings on the mask) / (the area of the image display region 7 a). Therefore, in the sense that each region surrounded by the opening is wider, this mask has a higher rigidity and may be less susceptible to the influence of radiant heat during vapor deposition. In the case of the embodiment as shown in FIG. 12, it can be said that the manufacturing ease of the organic EL device is enhanced also in such a meaning.

(2) The organic EL device of each of the above embodiments is a top emission type, and the present invention is most preferably applied to such a form. However, the present invention is applied to a bottom emission type and a dual emission type. It is not positively excluded.

In this regard, in the above embodiment, the counter electrode 5 is made of a transparent conductive material such as ITO, but the present invention is not limited to this. As already described with reference to FIGS. 6 to 8, the counter electrode 5 can be made of MgAg in addition to ITO, or can be made of other materials such as Ag, Al, and Au. . In this case, even if the material is an opaque material, it is still possible to construct a top emission type organic EL device if the thickness of the counter electrode 5 is sufficiently reduced (for example, 10 nm or less). is there.
However, in this case, since the thickness of the counter electrode 5 is extremely thin, even if it is made of a low resistance material, its resistance becomes very large.
However, since the solution of the problem caused by the high-resistance counter electrode is exactly one of the objects of the present invention, there is no fear of the situation.
In short, in the present invention, there is no particular limitation as to what material the counter electrode 5 is specifically made of, and even if the counter electrode 5 is made of any material, Application is possible and a corresponding effect can be enjoyed.

(3) In each of the above embodiments, the light emitting functional layer 18 includes an organic EL substance made of a polymer material, but the present invention is not limited to this form. For example, the light emitting functional layer 18 may include an organic EL material made of a low molecular material. In this case, the manufacturing method is preferably not the droplet coating method (inkjet method) but the vapor deposition method or the like.

<Application example>
Next, an electronic apparatus using the light emitting device according to the present invention will be described. FIG. 13 to FIG. 15 show forms of electronic devices that employ the organic EL device according to the embodiment described above.

  FIG. 13 is a perspective view showing a configuration of a mobile personal computer employing an organic EL device. The personal computer 2000 includes an organic EL device 100 that displays various images, and a main body 2010 on which a power switch 2001 and a keyboard 2002 are installed.

  FIG. 14 is a perspective view showing a configuration of a mobile phone to which the organic EL device 100 is applied. The cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the organic EL device 100 that displays various images. By operating the scroll button 3002, the screen displayed on the organic EL device 100 is scrolled.

  FIG. 15 is a perspective view showing a configuration of a personal digital assistant (PDA) to which the organic EL device 100 is applied. The portable information terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and the organic EL device 100 that displays various images. When the power switch 4002 is operated, various information such as an address book and a schedule book are displayed on the organic EL device 100.

  As electronic devices to which the light emitting device according to the present invention is applied, in addition to the devices illustrated in FIGS. 13 to 15, a digital still camera, a television, a video camera, a pager, an electronic notebook, electronic paper, a calculator, a word processor, a workstation Video phones, POS terminals, printers, scanners, copiers, video players, devices equipped with a car navigation system, and the like.

It is a top view which shows schematic structure of the organic EL apparatus which concerns on this embodiment of this invention. FIG. 2 is a circuit diagram showing details of a unit circuit in FIG. 1. FIG. 2 is a cross-sectional view of a suitable fracture surface of the organic EL device shown in FIG. 1, in particular, a cross-sectional view based on a fracture surface selected so as to show the formation of auxiliary electrodes and related elements. FIG. 2 is a partially enlarged plan view of the organic EL device shown in FIG. 1 and particularly shows a formation mode of auxiliary electrodes and elements related thereto (hereinafter, the latter point is shown in FIGS. 5 to 8 and FIGS. 10 to 10). Same in FIG. 12). FIG. 2 is a plan view of the organic EL device shown in FIG. 1. It is a top view of the organic electroluminescent apparatus which concerns on <Example 1> (= full length of the fracture | rupture part 501A is 1/3 of the auxiliary electrode 501). It is a top view of the organic electroluminescent apparatus which concerns on <Comparative example 1> (= full length of the fracture | rupture part 501B is 2/3 of the auxiliary electrode 501). It is a top view of the organic electroluminescent apparatus which concerns on <Comparative example 2> (= it does not have a fracture | rupture part). It is a figure which shows the general characteristic which an organic EL element has, Comprising: (A) is a voltage-current characteristic, (B) is a current-luminance characteristic. 12 is a plan view of an organic EL element according to Modification 1 (= broken portions 503 are arranged in a checkered pattern). FIG. It is a top view of the organic EL element which concerns on the modification 2 (= it has the auxiliary electrode 504 extended in a column direction). It is a top view of the organic EL element which concerns on the modification 3 (= the formation density of the fracture | rupture part 505 is small compared with FIG. 10). It is a perspective view which shows the form (personal computer) of the electronic device which concerns on this invention. It is a perspective view which shows the form (cellular phone) of the electronic device which concerns on this invention. It is a perspective view which shows the form (mobile information terminal) of the electronic device which concerns on this invention.

Explanation of symbols

7: Element substrate, 7a: Image display area, 8: Organic EL element, 13: Pixel electrode, 18: Light emitting functional layer, 5: Counter electrode, 501, 504 ... Auxiliary electrode, 502, 501A , 501B, 503, 505... Fractured portion, W... (Auxiliary electrode) width, T... (Auxiliary electrode) thickness,
DESCRIPTION OF SYMBOLS 11 ... Circuit element thin film, 301 ... 1st interlayer insulation film, 302 ... 2nd interlayer insulation film, 34 ... Reflection layer, 340 ... Partition, 103A, 103B ... Scan line drive circuit, 106 ... Data Line drive circuit, 106A... Precharge circuit, 201.

Claims (8)

A substrate,
Light-emitting elements arranged in a matrix on the substrate,
With
The light emitting element is
Including first and second electrode layers formed on the substrate, and a light emitting functional layer sandwiched between the first and second electrode layers,
The second electrode layer further includes
A main electrode formed to cover the surface of the substrate;
N auxiliary electrodes (N is a positive integer) that are formed so as to have direct contact with the main electrode and extend between the light emitting elements arranged in accordance with the matrix arrangement,
Including
The auxiliary electrode is made of a material having a lower electrical resistance than the main electrode,
At least one auxiliary electrode among the N auxiliary electrodes is:
Having at least one break in the middle of its extending direction,
And,
The sheet resistance of the second electrode layer is a predetermined value or less,
A light emitting device characterized by that. The auxiliary electrode is disposed so as to extend along the row direction of the light emitting element.
The light-emitting device according to claim 1. The predetermined value is 1 [Ω / sq. ]
The light-emitting device according to claim 1 or 2. Occupying the surface of the substrate, the area of the fractured portion,
The ratio to the area of the formation region of the auxiliary electrode including the fracture portion is,
Below 50%,
The light-emitting device according to claim 1 or 2. A power line electrically connected to the second electrode layer on the substrate;
The light-emitting device according to any one of claims 1 to 3. The main electrode has a substantially quadrilateral shape in plan view,
The power line is
Having a portion facing each of two opposite sides of the main electrode;
The light emitting device according to claim 5. The main electrode is made of a transparent conductive material,
The light emitting device according to any one of claims 1 to 6. The light-emitting device according to claim 1 is provided.
An electronic device characterized by that.

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