JP5541984B2 - Organic EL display device - Google Patents

Description

  The present invention relates to an organic EL display device, and more particularly to a transmissive display device (see-through display) capable of transmitting light through an image display unit of a display.

  Organic electro-luminescence (Organic EL-Lumine scence / hereinafter referred to as “Organic EL”) display devices that utilize the luminescence phenomenon of organic materials have higher image quality than liquid crystal displays and plasma displays, and can be made even thinner. Since it has excellent features such as high brightness, high definition, and low power consumption, it has been developed as a next-generation display device in recent years. For example, it is used as a display for various electronic devices such as televisions, car navigation systems, and portable terminals. It is becoming.

  In such an organic EL display device, a light emitting element (organic EL element) is formed by laminating organic substances that are light emitters so as to be sandwiched between yin and yang electrodes. Configure.

  In addition, if an organic EL element is used, a transmissive display (see-through display) can be configured. For example, a display installed on the back side of the screen can be observed from the front side of the screen through the display, By arranging the see-through display in front of various displays such as an instrument panel (vehicle-mounted meter) of an automobile, it is possible to switch between the front display by the display and the display behind the display (for example, See Patent Document 4 below). As described above, the organic EL see-through display can be expected to have various usage forms different from the conventional display that simply displays the image by emitting light from the screen, and expands the functions and design of the display. Is.

  On the other hand, there is the following patent document as a disclosure of such an organic EL display device, and in particular, Patent Documents 4 to 8 target a see-through display.

Japanese Patent Laid-Open No. 9-148074 (Japanese Patent No. 2770013) JP-A-8-185984 (Patent No. 3560375) JP-A-10-294182 JP 2001-148292 A JP 2002-289362 A JP 2002-334792 A JP 2005-108672 A JP 2006-234963 A

  By the way, as a method for realizing a transmissive organic EL display, a method of using a transparent conductive film for an anode and a cathode has been mainly used. This method is compared with a case where a display is driven by an active matrix driving method. A good display quality was obtained.

  However, when adopting a passive matrix driving system that is advantageous in terms of cost, there are the following problems, and a satisfactory see-through display cannot be obtained.

(1) First, the transparent electrode is generally unable to achieve both a sufficiently high transmittance and a sufficiently low sheet resistance as required for a passive matrix see-through display. When the passive matrix driving method is used, it is necessary to use at least one electrode having a low resistance value. This is because line-sequential scanning drive is performed using one electrode (generally a cathode) as a common electrode.

  However, increasing the transmittance of the common electrode increases the wiring resistance, which causes brightness irregularities that make the brightness non-uniform on the display surface, and the brightness changes to stripes depending on the display content. Crosstalk is observed, and the display quality is significantly impaired. On the other hand, in order to improve this, a sufficiently low resistance value (substantially a sheet resistance value of 1Ω / □ or less is preferable) is required. Alternatively, an organic EL element that emits brighter light with a small current can be configured without reducing the resistance of the electrode, but it is difficult to obtain an organic EL material that can obtain high luminance with such a small current. .

(2) On the other hand, in order to reduce the wiring resistance, the film thickness of the transparent electrode is increased, a very thin layer of silver, which is a low-resistance metal, is laminated on the transparent electrode, or the low-resistance metal is applied to the transparent electrode layer. Mixing is also possible, but both have a trade-off relationship with the transmittance of the common electrode, and if the resistance value is kept low, the transmittance will decrease, and if the transmittance is increased, the resistance value will increase. Inevitably, it is difficult to achieve both display quality and see-through display characteristics.

(3) Further, when the low resistance metal is laminated or mixed with the transparent electrode as described above, it is necessary to uniformly dispose a very thin or extremely small amount of the low resistance metal material within the display surface. This is to make the transmittance in the display surface uniform and suppress the variation in transmittance between displays. The low-resistance metal material used at this time is an amount corresponding to a thickness of several atoms to several tens of atomic layers, but it has been found that the difference in several atomic layers results in a difference in transmittance on the order of percent. In addition, the technical difficulty becomes very high especially in mass production.

  On the other hand, in Patent Document 4 (Japanese Patent Application Laid-Open No. 2001-148292), the cathode has a partially laminated structure in which a metal thin film layer that can transmit light and a thick film layer that secures low wiring resistance are separated. The see-through function is realized by providing a thin film region by the thin film layer and a thick film region by the thick film layer. However, in this structure, even in the thin film region, the transmitted light must pass through the metal film, and a transmittance higher than a certain level cannot be expected, and the cathode is made of a light transmissive thin film layer and a low resistance thick film layer. Therefore, it is difficult to increase the manufacturing cost.

  As described above, in the conventional display structure, it is difficult to achieve both the characteristics as a see-through and the display quality and to mass-produce displays at low cost.

  In addition, in a display using both the anode and the cathode as a transparent electrode (for example, Patent Documents 5 and 6 described above), light is emitted to both the front and back surfaces of the display. In the case where a display is arranged on the front side of an on-vehicle meter of an automobile as described above, the light emitted from the back side is reflected on the rear meter and displayed on the display. If the light is radiated to the back side, problems may occur depending on the usage, such as making it difficult to see, or causing malfunctions of devices and components placed on the back side depending on the installation status of the display. Such a problem can also occur in the structure described in Patent Document 4 (Japanese Patent Laid-Open No. 2001-148292).

  Further, in the see-through display, there is a problem in that the appearance of the display panel changes due to a difference in transparency (light transmittance) between the display unit (display region) and the surrounding region (outer region). Specifically, a display unit having a laminated structure for displaying an image has a lower transparency than the periphery thereof, and a frame-like portion having a high transparency can be seen around the display unit.

  Therefore, an object of the present invention is to solve the conventional problems as described above, to obtain a good display quality without complicating the element structure, and to have a good appearance in which the transparency of the display portion and the surrounding area is close. The point is to realize a see-through organic EL display.

  In order to solve the above problems and achieve the object, an organic EL display device according to the present invention includes a first electrode, an organic EL layer, and a second electrode, which are sequentially stacked on a light-transmitting support substrate. An organic EL display device comprising a display unit in which a plurality of organic EL elements are arranged two-dimensionally on the support substrate so as to constitute a pixel, wherein one of the first electrode and the second electrode Is an electrode having translucency, and the other of the first electrode and the second electrode is an electrode having no translucency, and the electrode having no translucency is formed from a plane. It is arranged so that it is present only in a part of each pixel when viewed, so that light can be transmitted through the display part through a part in the pixel where the non-translucent electrode is not arranged. A dummy electrode is provided in an outer region of the display unit on the support substrate.

  In the display device of the present invention, for the organic EL elements constituting each pixel of the display unit, a first electrode provided on the lower surface side of the organic EL layer (the side closer to the support substrate of the front and back surfaces of the organic EL layer), and the organic One of the second electrodes provided on the upper surface side of the EL layer (the side farther from the support substrate of the front and back surfaces of the organic EL layer) is a translucent electrode (hereinafter referred to as “translucent electrode” or “transparent electrode”). And the other is an electrode having no translucency (hereinafter referred to as “non-translucent electrode” or “non-transparent electrode”).

  Then, the non-translucent electrode that does not have translucency is not formed so as to spread over the entire pixel in each pixel, but is formed so that the non-translucent electrode is disposed only in a part thereof. . As a result, the periphery of the non-translucent electrode in each pixel has translucency, and is displayed through a region around the non-translucent electrode in the pixel (hereinafter, this region is referred to as a “see-through region”). Light is transmitted through the portion, and the display device of the present invention has a function as a see-through display.

  In the present invention, the translucent electrode is typically ITO (Indium Tin Oxide). However, the present invention is not limited to this, and other light-transmitting conductive materials such as IZO (Indium Zinc Oxide / indium zinc oxide), tin oxide, and zinc oxide can also be used.

  On the other hand, the non-transparent electrode may be a single-layer or multi-layer thin film of a low-resistance metal or alloy, and may be composed of a metal thin film such as aluminum, silver, a silver-magnesium alloy, or calcium. . In the present invention, it is not necessary to consider the light transmittance in the present invention, and a low resistance material can be used, and the film thickness can be set to a desired value (increased). Therefore, the wiring resistance of the electrode can be kept low, and good display quality can be obtained if the electrode is a common electrode, for example.

  The laminated structure of the organic EL layer and the material used are not particularly limited. For example, the organic EL layer may have a five-layer structure in which a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer are sequentially stacked, or a three-layer structure in which the injection layer and the transport layer are combined. (Hole transporting layer, light emitting layer and electron transporting layer) Other structures can also be adopted. An example of the material used for each layer will be described later in the description of the embodiment, but the present invention is not limited to this, and various materials can be used.

  In a conventional see-through display using an organic EL element, for example, a transparent electrode (translucent electrode) is used as an electrode disposed on both surfaces of the organic EL layer, thereby ensuring light transmission. However, in such a display, even if the material used is devised, it is at best that the transparent electrode secures a transmittance of about 50 to 90%. On the other hand, according to the display device of the present invention, in the see-through region, there is no electrode on the side where the non-translucent electrode is arranged, so that the region is 10% to 50% compared to the conventional see-through display. % Light transmittance can be expected.

  In the present invention, not only the non-translucent electrode but also the translucent electrode (the electrode disposed on the surface opposite to the non-translucent electrode with the organic EL layer interposed) in the see-through region. It is also possible not to arrange the electrode in a part of the see-through region. For example, the gap between the transparent electrodes may be widened or the width of the transparent electrode in the see-through region may be narrowed. According to such a structure, since both the translucent electrode and the non-translucent electrode do not exist in the see-through region, the light transmittance of the see-through region can be further increased. Further, the light transmittance of the display portion can be increased by widening the see-through region in each pixel (reducing the area occupied by the non-transparent electrode in the pixel).

  In addition, if the see-through area is widened in each pixel, the light transmittance of the display portion is increased correspondingly, but conversely, an area where light is emitted by laminating a translucent electrode, an organic EL, and a non-translucent electrode. (Hereinafter referred to as “light emitting region”) becomes smaller. Therefore, the size of the see-through region (arrangement area of the non-translucent electrode in the pixel) may be determined in accordance with the use and usage form of the display device, required specifications, and the like. As described above, the present invention relates the ratio of the see-through region to the light-emitting region in the pixel, in other words, the transmittance of the display unit (degree of see-through) and the brightness of the display unit (luminance). It can be freely and easily changed simply by changing the area (area occupied in the pixel), and has the advantage that it can flexibly meet the specifications and requirements required for the see-through display.

  However, in the present invention, it is preferable that the non-transparent electrode occupies an area of 5% to 95% of the pixel area when viewed from the plane. When the non-transparent electrode is less than 5% of the pixel area, the display surface becomes dark (the luminance of the display unit is reduced). On the other hand, when it exceeds 95%, the light transmittance of the display unit is reduced, for example, on the back side of the display. This is because the function as a see-through display deteriorates, for example, the displayed display becomes difficult to see.

  Further, in the display device of the present invention, the light emitting region is only a portion where the first electrode and the second electrode directly sandwich the organic EL layer, and one of the electrodes sandwiching the organic EL layer is a non-translucent electrode. One of the front and back surfaces of the display (display unit) (the surface of the organic EL layer on the side where the translucent electrode is disposed / hereinafter, the surface on the side is referred to as “front” or “display surface”. ) Only from the other surface of the display (the surface of the organic EL layer on both sides of the organic EL layer on which the non-translucent electrode is disposed / hereinafter referred to as the “rear surface”). It is possible to prevent the occurrence of inconveniences such as the display on the back side of the display as described above being affected due to leakage.

  A more specific structure of the display unit is typically as follows. The organic EL elements are arranged in a matrix on a support substrate, and the pixels have a square (square or rectangular) planar shape. Each of the translucent electrode and the non-translucent electrode includes a plurality of strip-shaped electrodes extending in parallel with a predetermined interval, and the translucent electrode and the non-translucent electrode are formed from a plane. When viewed, the pixels are substantially orthogonal to each other, and the translucent electrodes are disposed across a pair of opposing sides of the pixel and have a width smaller than the length of the side.

  Furthermore, in the present invention, it is desirable that the surface of the non-translucent electrode facing the organic EL layer is a mirror surface. This is because the emitted light obtained from the organic EL layer is reflected by the mirror surface toward the translucent electrode (front side of the display unit) to increase the luminance of the display unit.

  Moreover, when forming such a mirror surface, it is preferable to devise a method for flattening the surface of the organic EL layer or the non-translucent electrode itself. This is to improve the reflectivity by increasing the smoothness of the mirror surface. For example, when the second electrode laminated on the organic EL layer is a non-translucent electrode, before the second electrode is formed on the organic EL layer, the upper surface of the organic EL layer (second The surface facing the electrode) is flattened. The specific method of planarization is not ask | required. For example, the transparent electrode under the organic EL layer may be smoothed by mechanical / physical processing (for example, polishing), or the transparent electrode material may be formed into an amorphous film. The organic EL layer on the transparent electrode can be flattened by using a material that can be made liquid or liquid when forming a thin film such as a conductive polymer.

  On the other hand, when the first electrode disposed between the support substrate and the organic EL layer is a non-translucent electrode, the first electrode is formed before forming the organic EL layer on the first electrode. The upper surface (surface on the side facing the organic EL layer) of the (non-transparent electrode) is planarized. A specific method for planarization may be the same method as described above.

  Further, the non-transparent electrode is a line (hereinafter referred to as “pixel center”) that connects the centers of a pair of opposite sides of the pixel when viewed from a plane (from a direction orthogonal to the support substrate or the display portion). It may be arranged so as to overlap the line. If the non-transparent electrode is arranged at the center of the pixel in this way (compared to the case where it is arranged at the edge), the non-transparent electrode is displaced and the arrangement position is the width of the electrode. Even if there is a slight shift in the direction, it is possible to prevent fluctuations in the area ratio of the see-through region and the light emitting region in the pixel, so a display having an accurate transmittance and luminance closer to the design values is manufactured. And the yield of the product can be improved.

  In the present invention, a plurality of (for example, two or three or more) non-transparent electrodes may be provided for each pixel. If the non-transparent electrode that crosses each pixel is not composed of a single electrode but is divided into a plurality of electrodes in this way, an increase in electrical resistance and a decrease in the amount of emitted light (luminance) of the display unit Since the line width of each non-translucent electrode can be reduced without incurring light, the presence of the non-translucent electrode can be made inconspicuous. (Ease of visibility behind the club) can be improved.

  Moreover, in this invention, it is desirable to provide the interlayer insulation film laminated | stacked so that it may interpose between a 1st electrode and an organic electroluminescent layer. This is to avoid an electrical short circuit between adjacent pixels (first electrodes) and to prevent crosstalk light emission (unintentional light emission in adjacent pixels). In addition to having electrical insulation, the interlayer insulating film preferably has translucency in order to improve the light transmissivity of the display portion. Note that materials that can be used for such an interlayer insulating film will be described later in the description of the embodiment. In addition, the interlayer insulating film has an opening that forms a light emitting portion by bringing the first electrode and the organic EL layer into contact with each other in an intersecting region of the first electrode and the second electrode.

  Furthermore, the present invention may further include a laminate that is laminated on the interlayer insulating film and has a top surface that is higher than the top surface of the organic EL layer.

  Conventionally, a partition wall for forming a second electrode (an electrode disposed on the upper surface side of the organic EL layer) in a striped pattern may be provided on the interlayer insulating film (see FIG. 10). Reference numeral 24 denotes an interlayer insulating film, and reference numeral 25 denotes a partition. The partition walls are generally called “element isolation layers” or “cathode partition walls” and are formed in stripes parallel to the extending direction of the second electrode to be formed later, and each partition stands on the interlayer insulating film. The top surface of the organic EL layer and the top surface of the second electrode formed thereon are higher. By providing such a tall partition wall on the interlayer insulating film, even if the material of the second electrode is uniformly deposited on the display portion by vapor deposition or the like without using a striped pattern mask, the partition wall is formed by the partition wall. The adjacent second electrodes can be separated by the level difference, and a striped second electrode can be formed for each pixel between the partition walls.

  On the other hand, in the present invention, as a typical method for forming the second electrode, for example, the second electrode is formed using a striped pattern mask (metal mask). However, if a stacked body standing on the interlayer insulating film like the partition is further provided, a space is formed between the pattern mask and the display device (already formed layer) when forming the cathode. The laminate functions as a spacer, and a layer (for example, an organic EL layer) already formed by a mask used when forming the second electrode can be prevented from being damaged. Therefore, in one embodiment of the present invention, a stacked body (in other words, a spacer) is provided which is stacked over an interlayer insulating film and has a top surface higher than the top surface of the organic EL layer. Note that, similarly to the interlayer insulating film, this stacked body (partition / spacer) is preferably formed of a light-transmitting material in order to increase the light transmittance of the display portion.

  Further, the laminate (spacer) on the interlayer insulating film may be a columnar structure such as a cylinder or a polygonal column instead of a partition wall structure. In this case, even if the light transmittance of the laminate is not sufficiently high, the size can be reduced to the minimum necessary size to support the pattern mask. The material selection is less restricted. In addition, when such a columnar structure is adopted as a laminated body on the interlayer insulating film, a conductive material can be used. If this columnar structure is almost the same in diameter and width as the height, it will hardly break due to contact with the pattern mask, but it depends on the strength of the material used and the force with which the pattern mask contacts, so The ratio of the diameter, width and height may be appropriately set to a value corresponding to the strength of the material used and the contact force of the pattern mask. In addition, the lower the density of the columnar structures, the easier it is to increase the light transmission of the display. However, the installation density required to prevent contact with the mask changes depending on the deflection of the pattern mask and the force of contact. The installation density of the columnar structures may be determined so as to ensure as high light transmittance as possible according to the mask to be used. Further, it is desirable in terms of strength that the cross-sectional shape of the columnar structure is large / wide on the side close to the substrate and small / narrow on the far side.

  The display device of the present invention may further include a sealing plate fixed to a support substrate so as to cover the display unit. In this case, the sealing plate is formed of a light-transmitting material such as glass or resin.

  Further, instead of the sealing plate or in addition to the sealing plate, a sealing thin film that covers the display portion may be provided. This sealing thin film is a film having translucency and capable of preventing or suppressing moisture from entering the display portion. If such a film is provided, it is possible to omit the desiccant conventionally provided to remove moisture, and the display can be reduced in size accordingly. The material and structure of the sealing thin film are not particularly limited. For example, a single-layer film or a plurality of films each including at least one of silicon oxide, silicon nitride oxide, silicon nitride, silicon oxide carbide, and aluminum oxide are laminated. The laminated film can be made. The film thickness may be, for example, about 0.3 to 10 μm. These sealing thin films may contain 10% or less of hydrogen.

  In the present invention, the display unit further includes another display unit, that is, a display unit capable of performing a display different from the display by the display unit on the back side of the display unit (the rear side of the display unit). Light (light emitted from the display means or light reflected by the display means) is transmitted through the see-through region (a portion in a pixel where a non-translucent electrode is not disposed) to transmit the display section. You may make it visible from the front side.

  According to such a display device, for example, it is possible to switch between the image of the see-through organic EL display arranged on the front and the display by the display means arranged on the back, or to perform a combined display. Become. The display means includes, for example, various displays (such as an organic EL display and a liquid crystal display) that can display an image. In addition to the display, for example, an illumination device that simply irradiates light may be used. It may be various displays that do not emit light (visible by reflected light). When the display device includes an illumination device, for example, if the illumination device is a light emitter that can emit light of various colors, the light emitted from the light emitter and an image by a see-through organic EL display disposed on the front surface It is also possible to construct a display in which the background color can be changed in various ways by combining.

  On the other hand, in the present invention, in order to solve the problem that the display panel (display area) and the surrounding area (outer area) have a difference in transparency and the appearance of the display panel changes, the display on the support substrate is changed. A dummy electrode is provided in the outer region of the part.

  This dummy electrode lowers the light transmittance of the outer region of the display unit and brings the light transmittance of the outer region closer to the light transmittance of the display unit. As this dummy electrode, for example, it can be formed of the same material as the non-translucent electrode (for example, the second electrode) disposed in the display unit (such a dummy electrode is referred to as a non-transparent dummy electrode). say). As described above, if the dummy electrode is formed of the same material as the non-transparent electrode, the dummy electrode is simultaneously formed (together with the non-transparent electrode) when the non-transparent electrode is formed on the display portion. Can be arranged in the outer area of the display unit. The dummy electrode may have substantially the same width dimension and substantially the same electrode spacing as the non-transparent electrode arranged in the display unit.

  The dummy electrode can also be formed of the same material as the translucent electrode (for example, the first electrode) disposed in the display portion (such a dummy electrode is referred to as a translucent dummy electrode). ). As described above, if the dummy electrode is formed of the same material as the non-translucent electrode, the dummy electrode is displayed simultaneously with the translucent electrode when the translucent electrode is formed on the display portion. It can be formed in the outer region of the part. Further, the dummy electrode may have substantially the same width dimension and electrode interval as the translucent electrode arranged in the display unit.

  Further, the dummy electrode includes a non-translucent dummy electrode having no translucency and a translucent dummy electrode having a translucency, and the non-transparent dummy electrode is disposed in the display portion. The translucent electrode may be made of the same material, and the translucent dummy electrode may be made of the same material as the translucent electrode arranged in the display unit. Also in this case, the non-transparent dummy electrode has substantially the same width and electrode interval as the translucent electrode arranged in the display unit, and the translucent dummy electrode is arranged in the display unit. The electrode can have substantially the same width and electrode spacing as the conductive electrode.

  If dummy electrodes are provided in the outer area around the display portion in this way, the difference in transparency between the display area and the outer area can be reduced, and the appearance of the display can be improved. Further, in order to reduce the difference in transparency between the display area and the outer area and widen the outer area, a plurality of dummy electrodes may exist.

  Further, in addition to the dummy electrode, the interlayer insulating film may be formed so as to extend to an outer region where the dummy electrode is provided. A short circuit is prevented from occurring between the electrodes of the display portion via the dummy electrodes arranged in the outer region (this will be described in more detail in the description of the embodiment below), and the transparency of the outer region is further increased in the display portion. This is to bring it closer. Similarly, in order to bring the transparency of the outer area closer to the display portion, the same opening (substantially the same area and arrangement interval as the opening in the display area) is formed in the interlayer insulating film in the outer area. (Referred to as “dummy opening”). Further, similarly, from the viewpoint of bringing the transparency of the outer region closer to the display unit, an organic material forming the organic EL layer may be disposed in the outer region. Here, the organic material disposed in the outer region may include all organic materials forming the organic EL layer of the display unit, or may include only a part thereof.

  Since the dummy electrode is provided for adjusting the transparency, it need not be connected to a circuit (driving IC) for driving the display unit, and any material, shape, or arrangement pattern may be used (not necessarily Need not be conductive). However, it is preferable from the point which prevents the increase in the number of manufacturing processes to comprise with the same material as the electrode (1st electrode or 2nd electrode) distribute | arranged to a display part.

  ADVANTAGE OF THE INVENTION According to this invention, while obtaining favorable display quality, without complicating an element structure in a see-through organic electroluminescent display, the display with the good appearance close | similar to the transparency of a display part and its peripheral region is realizable.

  Other objects, features, and advantages of the present invention will become apparent from the following description of embodiments of the present invention described with reference to the drawings. In addition, in each figure, the same code | symbol shows the same or an equivalent part.

FIG. 1 is a plan view schematically showing a first organic EL display device to which the present invention can be preferably applied. FIG. 2 is a diagram showing a cross-sectional structure (A-A cross section) of the first organic EL display device. FIG. 3 is an enlarged plan view schematically showing a part of the first organic EL display device (part B in FIG. 1). FIG. 4 is a diagram schematically showing a cross-sectional structure (C1-C1 cross section in FIG. 3) of the first organic EL display device. FIG. 5 is an enlarged cross-sectional view of the cathode included in the first organic EL display device. FIG. 6 is an enlarged cross-sectional view showing another configuration example of the cathode provided in the first organic EL display device. FIG. 7 is a plan view showing a second organic EL display device to which the present invention can be preferably applied, similarly to FIG. FIG. 8 is a diagram schematically showing the cross-sectional structure (C2-C2 cross section of FIG. 7) of the second organic EL display device, similarly to FIG. FIG. 9 is a plan view showing an organic EL display device according to an embodiment of the present invention in the same manner as FIG. 1 (a sealing plate covering a display unit is not shown). FIG. 10 is an enlarged plan view schematically showing a part of the organic EL display device according to the embodiment (peripheral portion of the display unit / D portion of FIG. 9). FIG. 11 is a plan view schematically showing a part of the organic EL display device (peripheral portion of the display unit / D portion of FIG. 9) according to a modification of the embodiment in the same manner as FIG. FIG. 12 is a plan view schematically showing a part of the organic EL display device (peripheral portion of the display unit / D portion of FIG. 9) in an enlarged manner similarly to FIG. 10 according to another modification of the embodiment. is there. FIG. 13 is a plan view schematically showing an enlarged part of the organic EL display device (peripheral portion of the display unit / D portion of FIG. 9) according to still another modification of the embodiment in the same manner as FIG. It is. FIG. 14 is a plan view showing an example of a conventional organic EL display device. FIG. 15 is a diagram schematically showing a cross-sectional structure (cross-section CC in FIG. 14) of a conventional organic EL display device.

  Hereinafter, embodiments of the present invention will be described. First, a first organic EL display device and a second organic EL display device to which the present invention can be preferably applied will be described, and then embodiments of the present invention will be described. Will be described.

[First display device]
As shown in FIGS. 1 to 2, a first organic EL display device 11 to which the present invention can be preferably applied is a translucent flat glass substrate 12 (hereinafter simply referred to as “substrate”). ), An organic EL display unit 13 (hereinafter referred to as “display unit”) formed on the surface of the glass substrate 12, a sealing thin film 14 covering the display unit 13, and a display covered with the sealing thin film 14 A sealing plate 15 that covers and seals the portion 13; an IC (Integrated Circuit) 16 that drives the display portion 13; and an FPC (Flexible Printed Circuit board) 17 that is connected to the IC 16; Is provided.

  The display unit 13 displays a plurality of organic EL elements constituting the pixel two-dimensionally, that is, in the horizontal direction (x-axis direction in FIG. 1) and the vertical direction (y-axis direction in FIG. 1) so that an image can be displayed. As shown in an enlarged view in FIG. 3 to FIG. 4, an anode (transparent electrode) 21 and an interlayer insulation that electrically insulates adjacent anodes 21 from each other on a glass substrate 12. The film 24, the element isolation layer (partition / laminate) 25, the organic EL layer 22 including the light emitting layer, and the cathode 23 are sequentially laminated.

  The first display device 11 is a bottom emission type that emits display light downward (to the glass substrate 12 side) in FIGS. 2 and 4, and the display unit 13 is driven by a passive matrix method. In addition, the planar shape of the entire display unit is formed in a horizontally long shape in the illustrated example, but may be a vertically long shape (a dimension in the y-axis direction is larger than that in the x-axis direction) or an aspect ratio. May be substantially square shapes. In FIG. 3, the organic EL layer 22, the sealing thin film 14, and the sealing plate 15 are not shown (the same applies to FIGS. 7 and 14 described later).

  The anode 21 is made of ITO. The anodes 21 are arranged in parallel with each other in a stripe shape on the substrate 12 and are provided in a number corresponding to the number of pixels. Further, lead wires 19 are connected to the respective end portions of the anodes 21, these lead wires 19 are arranged so as to be drawn out from the display unit 13 (sealed space by the sealing plate 15), and connected to the driving IC 16. It is. Similarly, the cathode 23 described later is connected to the lead-out wiring 18 at each end portion (end portion of the display unit 13) of the cathode 23, and these are connected to the outside of the display unit 13 (sealing space by the sealing plate 15). And is electrically connected to the IC 16.

  The interlayer insulating film 24 preferably has translucency, in particular, has a high transmittance in the visible light region (the transmittance is 80% or more in the visible light region) and is as close to colorless and transparent as possible. This is because not only the region around the cathode 23 described later but also the region where the interlayer insulating film 24 is formed can transmit light and enhance the function as a see-through display. In addition, the interlayer insulating film 24 is assumed to have a resistance value that is higher than the level at which the current leaking between the adjacent anodes 21 does not affect the display quality. Specifically, such an interlayer insulating film 24 is made of, for example, an inorganic compound mainly composed of silicon oxide, silicon oxynitride, silicon nitride, aluminum oxide, tantalum oxide, acrylic resin, novolac resin, polyimide resin, poly It can be formed from a cycloolefin resin or the like. The interlayer insulating film 24 includes a pixel opening 24a having a substantially square planar shape.

  Further, in the first display device, an element isolation layer (partition / laminate) 25 is provided on the interlayer insulating film 24. This is to prevent the organic EL layer 22 from being damaged by the metal mask when the cathode 23 is formed. The element isolation layer 25 has a top surface higher than the top surface of the organic EL layer 22 formed on the anode 21 and is made of a material having insulating properties and translucency similarly to the interlayer insulating film 24.

  On the other hand, as described above, the organic EL layer 22 may have various laminated structures. However, the organic EL layer 22 has translucency and is almost colorless when formed. It is composed of a transparent organic material. This is to eliminate the influence on the light transmitted through the display unit 13 as much as possible and enhance the function as a see-through display. Such an organic EL layer 22 includes, for example, α-NPD (Bis [N- (1-naphthyl) -N-pheny] benzidine / hole transport layer) and Alq3 (trisquinolinato aluminum doped with rubrene). (Tris (8-hydroxyquinoline) aluminum) / light emitting layer), Alq3 (electron transport layer), and lithium fluoride (electron injection layer) are formed on the anode 21 in this order. I can do it.

  A cathode 23 is disposed on the organic EL layer 22. Similar to the anode 21, the cathodes 23 are provided in parallel with each other in a stripe shape corresponding to the number of pixels. However, the cathodes 23 are arranged so as to be substantially orthogonal to the anodes 21 when viewed from above. In the first display device, each cathode 23 has a width dimension W1 narrower than the pixel width W, and the organic EL layer 22 together with the anode 21 traverses a substantially central position of the pixel region (pixel opening 24a). Is disposed on the upper surface of the organic EL layer 22. A portion sandwiched between the cathode 23 and the anode 21 is a light emitting region.

  The lower surface 23a (surface on the organic EL layer 22 side / surface on the display display surface side) of the cathode 23 is a mirror surface. Further, in order to increase the reflectance of the mirror surface, it is desirable to perform a process for flattening the surface of the organic EL layer 22 as a lower layer before forming the cathode 23. This flattening process may be performed using the method described above. As a constituent material of the cathode 23, for example, aluminum, silver, or a silver-magnesium alloy may be used.

  The step of the cathode 23 preferably has a cross-sectional shape in which the film thickness decreases from the center of the pattern to the edge of the pattern in order to improve the coverage when the sealing thin film 14 (described later) is formed. As shown in FIGS. 4 and 5, the cathode 23 has a trapezoidal cross-sectional shape, and the top surface of the cathode 23 is the top surface of the organic EL layer 22 at both left and right edges. An inclined surface (tapered surface) 23b is formed so as to be directed downward. It is desirable that the inclined surfaces 23b on both edges of the cathode be as gentle as possible from the viewpoint of the coverage with the sealing thin film 14. In particular, at the edge of the pattern that becomes the boundary with the top surface of the organic EL layer 22, it is desirable that the inclination angle θ of the inclined surface 23b has a small angle of 30 ° or less, more preferably 1 ° or less.

  The inclined surface 23b does not need to be a flat surface, and may be a curved surface 43b that is curved (dented downward), for example, like the cathode 43 shown in FIG. If the inclined surface 43b is such a curved surface, the thickness of the central portion of the cathode 43 is increased to reduce the electric resistance, and at the same time the inclination angle θ of the edge of the cathode 43 is made extremely small. Thus, the coverage with the sealing thin film 14 can be improved.

  On the other hand, around the cathode 23, the substrate 12, the anode 21, the organic EL layer 22, the sealing thin film 14 (details will be described later), and the sealing plate 15 are all translucent, so that light can be transmitted. This is the see-through area. The degree of the ratio between the see-through area and the light emitting area where the cathode 23 is arranged may be determined according to the use and usage of the display device 11. Thus, according to the first display device, there is an advantage that the transmittance of the display device 11 can be set freely and easily only by changing the width dimension W1 of the cathode 23. In the light emitting region, since the cathode 23 does not have translucency, display light does not leak to the back side of the display device 11 (upward in FIG. 4), and the emitted light becomes a mirror surface. Since the light is reflected to the display surface side by the lower surface 23a of the cathode 23, a high-luminance display device can be configured.

  A sealing thin film 14 is provided on the cathode 23. The sealing thin film 14 is translucent and is formed so as to cover the entire display unit 13. As a material of the sealing thin film 14, for example, silicon oxide, silicon oxynitride, or the like can be used. Further, in order to improve the moisture barrier property, the sealing thin film 14 may be formed in a multilayer film structure in which polysilazane or the like is applied on a silicon oxide or silicon oxynitride film, for example.

  And the sealing board 15 is distribute | arranged so that the display part 13 in which the sealing thin film 14 was formed may be covered further. The sealing plate 15 can be formed of translucent glass or resin, and is adhered to the glass substrate 12 with an adhesive made of, for example, an acrylic or epoxy ultraviolet curable resin. In the case of using the sealing plate 15 made of a resin material, in order to enhance the sealing effect, the moisture permeation suppression (or prevention) effect mainly having silicon oxide, silicon oxynitride, alumina or the like on at least one surface thereof. It is preferable to form a thin film having

  As another example of the sealing structure, after forming the cathode 23, a glass plate provided with a concave portion is attached by etching, for example, and at this time, a desiccant is installed at a position where it is not visually recognized from the outside, or transparent You may make it apply | coat a suitable desiccant to the said recessed part. However, according to such a sealing structure, since it is necessary to secure an area for installing the desiccant, there is a difficulty that the display device becomes large. On the other hand, according to the sealing structure of the first display device provided with the sealing thin film 14, it is not necessary to provide a desiccant installation region, and there is an advantage that the display device 11 can be reduced in size.

[Second display device]
A second organic EL display device to which the present invention can be preferably applied will be described with reference to FIGS. 7 is a plan view corresponding to FIG. 3, and FIG. 8 is a cross-sectional view corresponding to FIG.

  As shown in FIGS. 7 to 8, the second display device is different from the first display device only in the structure of the cathode. Specifically, in the first display device, the cathode is constituted by one electrode for each pixel, but in this second display device, the cathode passing through each pixel is constituted by two electrodes. That is, two cathodes 23 pass through each pixel, and the width W2 of these two electrodes 23 is smaller than the width W1 of the cathode 23 in the first embodiment.

  In this way, if the cathode 23 that crosses each pixel is not constituted by a single electrode but is divided into a plurality of electrodes 23 that are thinner than this, it is possible to increase the amount of emitted light (brightness) without increasing the electrical resistance. ) And the presence of the cathode 23 is not conspicuous, and the visibility behind the display unit can be improved. In the second display device, each cathode is divided so that two thin electrodes (cathodes) 23 pass through each pixel. However, the number of the electrodes is not limited to two, and the number is three or more. It is also possible.

  As a comparison between the first and second display devices, FIGS. 14 to 15 show an example of a conventional organic EL display device. 14 is a plan view corresponding to FIG. 3, and FIG. 15 is a cross-sectional view corresponding to FIG. 4 (cross-section CC in FIG. 14). As shown in these figures, in the conventional apparatus structure, light from the back side of the display (upper part of FIG. 15) is blocked by the cathode 33 and cannot be transmitted through the display unit. Needs to use the cathode 33 as a transparent electrode. On the other hand, according to the first and second display devices, the width of the cathode 23 laminated on the upper surface of the organic EL layer 22 as described above without requiring a significant design change compared to the conventional device. A see-through display can be manufactured only by a simple design change by changing W1 and W2.

An example of the manufacturing process of the first and second display devices will be described as follows.
A transparent electrode film for forming an anode (ITO) 21 is formed to a thickness of 100 nm on a non-alkali glass substrate 12 having translucency, and photolithography technology (resist coating, exposure through a pattern mask, and A pattern is formed in a strip shape by development / etching treatment. If necessary, metal wiring used as a signal line or a power supply line is formed. The metal wiring is formed of, for example, molybdenum, molybdenum alloy, aluminum, aluminum alloy, titanium, titanium nitride, chromium, tungsten, tungsten alloy, silver, silver alloy, copper, copper alloy, and gold. Further, the metal wiring may have a laminated structure in which a plurality of films made of these metals are laminated, and can be arranged so as not to be visually recognized from the outside during use.

  Next, the interlayer insulating film 24 is formed so as to cover at least the step of the ITO 21. This interlayer insulating film 24 may be formed not only in one layer but also in two or more layers. Further, an element isolation layer (laminated body) 25 is formed on the interlayer insulating film 24. The element isolation layer 25 can serve as a spacer that prevents a metal mask used when forming the cathode 23 from being in direct contact with the organic EL element. The thickness is set to 0.5 μm to 10 μm, for example.

  Subsequently, a metal mask that defines a light emitting region is disposed on the substrate 12, and an organic EL layer 22 is formed. Specifically, α-NPD, Alq3 doped with rubrene, Alq3, and lithium fluoride are sequentially formed on the ITO 21. In this state, since the cathode 23 is not yet arranged, the entire light emitting region transmits light.

  Further, a metal mask with a gap in the form of a tin (blind) is disposed thereon, and aluminum is deposited to form a cathode 23 having a thickness of 100 nm. At this time, aluminum is deposited on the part where the gap is open, and the pattern of the cathode 23 made of aluminum obtained by inverting the pattern of the metal mask is transferred. The portion of the pixel where the cathode 23 is formed becomes a light emitting portion and does not transmit light. The portion where the cathode 23 is not formed (see-through region) remains in a state where light is transmitted.

  The resistance value (sheet resistance) of the cathode 23 is preferably 5Ω / □ or less, and more preferably 1Ω / □ or less. This is because the passive matrix display is driven by line sequential scanning as described above, and the cathode 23 is used as a common electrode in the first and second display devices. Here, although depending on the use of the display, a current of several mA to several hundred mA usually flows through the common electrode. A value obtained by multiplying the sheet resistance by the ratio of the length of the electrode and the width W1 of the electrode is the resistance value of the electrode 23. The voltage drop due to this resistance value is a power loss, and thus is preferably as small as possible. The smaller the better. Depending on the resolution of the display to be manufactured, the voltage drop due to the current is an allowable limit of about 1 to 2 V. If the sheet resistance is set to the above value, an appropriate product design that can fall within this level of voltage drop becomes possible. When an aluminum thin film (cathode 23) having a thickness of 100 nm is formed as described above by vapor deposition, the sheet resistance is about 0.3 to 0.4 Ω / □. Moreover, this aluminum thin film can reduce incident light to an intensity of 1/1000 or less, and the cathode 23 has the light-shielding property necessary for the present invention.

  When vapor-depositing the aluminum thin film, the glass substrate 12 is rotated to adhere aluminum to the substrate 12 from various angles. Thereby, the cathodes 23 and 43 having the inclined surfaces as described above can be formed. The inclination angle θ of the pattern edge is preferably 0.1 ° to 30 °. Thus, when the inclination angle θ of the pattern edges of the cathodes 23 and 43 is set to 30 ° or less, the sealing thin film 14 covers the pattern edges cleanly, and defects due to poor coating (generation of dark spots due to intrusion of moisture) are unlikely to occur. Become.

  Then, a transparent insulating film (sealing thin film 14) such as silicon oxide or silicon oxynitride is further formed on the cathode 23, the sealing plate 15 is adhered to seal the display portion 13, and the drive circuit ( IC) 16 and display unit 13 are electrically connected to complete display device 11.

Embodiment of the present invention
The organic EL display device according to the embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 9, the display device according to the embodiment of the present invention includes the display unit 13 similar to the first and second display devices, but the area around the display unit 13 (outer region). The 13D structure is different. Specifically, as shown in FIG. 10, in the display device 51 of the present embodiment, as a dummy electrode that improves the appearance of the display device 51 by matching the light transmittance around the display portion 13 </ b> D with the light transmittance of the display portion 13. Dummy anodes (translucent dummy electrodes) 21D and 21E made of the same material as the anode 21 and dummy cathodes (non-transparent dummy electrodes) 23D and 23E made of the same material as the cathode 23 are displayed. The interlayer insulating film 24 is formed so as to extend to the periphery of the display unit 13 so as to be disposed between the dummy anodes 21D and 21E and the dummy cathodes 23D and 23E.

  The dummy anodes 21D and 21E extend to the outside of the display unit 13 by extending the anode 21 to the outside of the display unit 13 and extend parallel to the anode 21 outside the display unit 13 apart from the anode 21. And an independent dummy anode 21E formed as described above. Also, the dummy cathodes 23D and 23E, like the dummy anodes 21D and 21E, extend the cathode 23 to the outside of the display unit 13 and protrude from the display unit 13, and the display unit separately from the cathode 23. 13, an independent dummy cathode 23 </ b> E formed so as to extend in parallel with the cathode 23.

  The width and arrangement interval (so-called line and space) of the dummy anodes 21D and 21E and the dummy cathodes 23D and 23E are the same as those of the anode 21 and the cathode 23 of the display unit 13, respectively. Therefore, in the present embodiment, the arrangement of the anode 21 and the cathode 23 is extended to the external region 13D that is the peripheral region of the display unit 13, and the electrodes for the masks that respectively form the anode 21 and the cathode 23 of the display unit 13 are used. The dummy electrodes 21D, 21E, 23D, and 23E can be formed in the outer region 13D of the display unit 13 by only simple design change that widens the formation region, and the light transmittance can be adjusted. In the present invention, the dummy electrodes 21D, 21E, 23D, and 23E are for adjusting the light transmittance around the display unit, and therefore need not necessarily have the same pattern as the electrodes (anode 21 and cathode 23) of the display unit 13. There may be other shapes and arrangement patterns.

  Further, when viewed from the plane, the extended dummy cathode 23D and the independent dummy anode 21E intersect in the outer region 13D, and an interlayer insulating film 24 is interposed between the extended dummy cathode 23D and the independent dummy anode 21E. Therefore, this interlayer insulating film 24 can prevent a short circuit from occurring between the cathodes 23 through the independent dummy anode 21E. Similarly, in the outer region 13D, the extended dummy anode 21D and the independent dummy cathode 23E intersect each other, but since the interlayer insulating film 24 is interposed between these dummy electrodes 21D and 23E, the independent dummy cathode 23E is passed through. There is no short circuit between the anodes 21.

  In this embodiment, since the dummy anodes 21D and 21E, the dummy cathodes 23D and 23E, and the interlayer insulating film 24 are disposed in the outer region 13D of the display unit 13 in the same manner as the display unit 13, the light in the outer region 13D is disposed. The transparency can be made close to the display unit 13, the appearance of the display unit 13 and its surroundings can be made uniform, and the appearance can be made uniform. Further, a plurality of dummy anodes 21D and 21E and dummy cathodes 23D and 23E may exist in order to reduce the difference in transparency between the display unit 13 and the outer region 13D and widen the outer region 13D. Further, from the viewpoint of bringing the transparency of the outer region 13D closer to the display unit 13, an organic material forming the organic EL layer 22 may be disposed in the outer region 13D.

  In the present embodiment shown in FIGS. 9 to 13, the extending direction of the anode 21 and the cathode 23 is different from that of the first and second display devices, and the anode 21 is in the horizontal direction (the x-axis direction in FIG. 9). ) Is arranged so that the cathode 23 extends in the vertical direction (y-axis direction in FIG. 9). However, the arrangement direction of the anode 21 and the cathode 23 is not an essential matter for the present invention, and any It is also possible.

  In the present embodiment, as shown in FIG. 11, a dummy opening 24D may be formed in the interlayer insulating film 24 similar to the pixel opening 24a provided in the display unit 13 (with the same shape, size and arrangement interval). . If such a dummy opening 24D is provided, the laminated structure of the outer region 13D becomes closer to the laminated structure of the display unit 13, so that the light transmittance of the outer region 13D can be made closer to the display unit 13. Become. However, in this case, in order to prevent the extended dummy cathode 23D and the independent dummy anode 21E from contacting each other through the dummy opening 24D, and the extended dummy anode 21D and the independent dummy cathode 23E from contacting each other, a short circuit occurs. An organic material for forming the organic EL layer 22 (not shown) provided is also formed in the outer region 13D so as to be interposed between the interlayer insulating film 24 and the dummy cathodes 23D and 23E. Thereby, it is possible to prevent the dummy anodes 21D, 21E and the dummy cathodes 23D, 23E from coming into contact with each other in the dummy opening 24D, and it is possible to prevent a short circuit from occurring through the dummy electrodes 21D, 21E, 23D, 23E.

  In this embodiment, the dummy electrodes (dummy anode and dummy cathode) are not extended from the anode 21 or the cathode 23 arranged on the display unit 13, but all or part of the dummy electrodes are the anode 21 and the cathode 23. It can also be constituted by a separated so-called island-like independent dummy anode 21E or independent dummy cathode 23E. According to such a structure, it is possible to eliminate the necessity of considering a short circuit through the dummy electrode, and from the viewpoint of preventing the short circuit, the organic material for forming the interlayer insulating film 24 and the organic EL layer 22 is disposed in the outer region 13D. No need to do.

  For example, in the example shown in FIG. 12, the dummy cathode on the upper side of the display unit 13 is an extended dummy cathode 23D continuous with the cathode 23, but a dummy anode (disposed above the display unit 13) intersecting with the extended dummy cathode 23D. The dummy anode) is an island-shaped independent dummy anode 21E separated corresponding to each dummy cathode 23D. The island-shaped independent dummy anode 21E has a width and length that are approximately the same as the length of one side of the pixel, as shown in FIG. Further, the dummy anode (dummy anode arranged on the left side of the display unit 13) extending in the extending direction of the anode 21 is also constituted by the independent dummy anode 21E separated from the anode 21, and arranged so as to intersect with these. A short circuit does not occur between the anodes 21 via the dummy cathode 23E.

  Furthermore, for example, as shown in FIG. 13, the independent dummy cathode 23E can also be an island-like dummy electrode 23E having a length as short as one side of the pixel. Even when the island-shaped dummy electrodes as shown in FIGS. 12 and 13 are employed, one or both of the organic materials forming the interlayer insulating film 24 and the organic EL layer 22 are used in the outer region 13D. In this way, the display unit 13 and the light transmittance can be more matched. Here, a dummy opening 24 </ b> D may be formed in the interlayer insulating film 24 from the viewpoint of bringing the transparency closer to the display unit 13.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and it will be apparent to those skilled in the art that various modifications can be made within the scope of the claims. .

  For example, in the above-described embodiment, the anode 21 (translucent electrode) is provided on the glass substrate 12 side and the cathode 23 (non-transparent electrode) is provided on the sealing thin film 14 side of both surfaces of the organic EL layer 22. On the contrary, a cathode 23 (non-transparent electrode) may be provided on the glass substrate 12 side, and an anode 21 (translucent electrode) may be provided on the sealing thin film 14 side. In this case, the display is a top emission type device that emits display light to the sealing thin film 14 side. The driving method of the display unit 13 may be an active matrix method. Furthermore, the display unit 13 has various structures to the extent that the light transmittance set in addition to the above embodiment is not impaired, such as the organic EL layer 22 including a plurality of light emitting layers having different emission wavelengths or a polarizing plate. You don't mind.

  Moreover, in the said embodiment, although the same structure as said 1st or 2nd display apparatus was provided as a suitable structure (structures, such as a display part) of the whole apparatus except the said outside area | region, the said structure, It is not necessarily the same as these first and second display devices, and may have other structures.

11 Organic EL Display Device 12 Glass Substrate 13 Organic EL Display Unit (Display Area)
13D outer region 14 sealing thin film 15 sealing plate 16 driving IC
17 FPC
18, 19 Lead wiring 21 Anode (ITO)
21D dummy anode (extended dummy anode)
21E Dummy anode (Independent dummy anode)
22 Organic EL layer 23, 33, 43 Cathode 23a Mirror surface (underside of cathode)
23b, 43b Inclined surface (edge of cathode top surface)
23D dummy cathode (extended dummy cathode)
23E Dummy cathode (Independent dummy cathode)
24 Interlayer insulating film 24a Pixel opening 24D Dummy opening 25 Element isolation layer (partition / laminate)

Claims (21)

An organic EL element in which a first electrode, an organic EL layer, and a second electrode are sequentially stacked on a light-transmitting support substrate is two-dimensionally formed on the support substrate so as to constitute a pixel. e Bei display unit which has a plurality of sequences,
One of said first and second electrodes, with a light-transmitting electrodes,
The other of the first and second electrodes, an electrode having no translucency,
By disposing the non-translucent electrode so that it is present only in a part of each pixel when viewed from above, the non-translucent electrode is not disposed. Forming a see-through region in each of the pixels,
Thus, light can be transmitted through the display section through the see-through region , and the display section is displayed when the image display side surface of the display section is the front surface and the display section surface opposite to the front surface is the back surface. What is present on the back side of the part can be seen from the front side of the display part through the display part
A transmissive organic EL display device,
A transmissive organic EL display device comprising a dummy electrode in the outer region of the display unit on the support substrate to reduce the light transmittance of the outer region so as to approach the light transmittance of the display unit. . The transmissive organic EL display device according to claim 1, further comprising: a non-transparent dummy electrode made of the same material as the non-transparent electrode disposed in the display unit as the dummy electrode. The transmissive organic EL display device according to claim 2, wherein the non-translucent dummy electrode has substantially the same width and electrode spacing as an electrode having no translucency arranged in the display unit. 4. The transmissive organic EL display device according to claim 1, further comprising: a translucent dummy electrode made of the same material as the translucent electrode disposed in the display unit as the dummy electrode. 5. . The transmissive organic EL display device according to claim 4, wherein the translucent dummy electrode has substantially the same width and electrode spacing as the translucent electrode disposed in the display unit. An interlayer insulating film laminated so as to be interposed between the first electrode and the organic EL layer;
The interlayer insulating film has a light-transmitting property and has an opening that forms a light emitting portion by bringing the first electrode and the organic EL layer into contact with each other in an intersecting region of the first electrode and the second electrode. And
The transmissive organic EL display device according to claim 1, wherein the interlayer insulating film is formed so as to extend to the outer region where the dummy electrode is provided. The transmissive organic EL display device according to claim 6, wherein the interlayer insulating film has a dummy opening, which is an opening having substantially the same area and arrangement interval as the opening, in the outer region. The transmissive organic EL display device according to claim 1, wherein an organic material for forming the organic EL layer is disposed in the outer region. The organic EL elements are arranged in a matrix on the support substrate, and
The pixel has a square planar shape,
The organic EL display device includes a plurality of strip-like electrodes extending in parallel with a predetermined interval as the translucent electrode and the non-translucent electrode,
These translucent electrode and non-translucent electrode are substantially orthogonal to each other in the pixel when viewed from above,
9. The transmission according to claim 1, wherein the non-translucent electrode is disposed so as to cross a pair of opposing sides of the pixel and has a width smaller than the length of the side. Type organic EL display device. 10. The transmissive organic EL display device according to claim 1, wherein a surface of the electrode having no translucency facing the organic EL layer is a mirror surface. 11. The second electrode is an electrode having no translucency,
The transmissive organic EL display device according to claim 10, wherein the surface of the organic EL layer facing the second electrode is flattened before the second electrode is formed on the organic EL layer. The first electrode is an electrode having no translucency;
The transmissive organic EL display device according to claim 10, wherein a surface of the first electrode facing the organic EL layer is flattened before the organic EL layer is formed on the first electrode. The electrode having no translucency is arranged so as to overlap with a pixel center line connecting the centers of a pair of opposing sides of the pixel when viewed from a plane. The transmissive organic EL display device according to Item. The transmissive organic EL display device according to any one of claims 1 to 12, wherein a plurality of electrodes having no translucency are provided for each pixel. The transmissive organic EL display device according to claim 1, wherein the electrode having no translucency occupies an area of 5% to 95% of a pixel area when viewed from a plane. An interlayer insulating film laminated so as to be interposed between the first electrode and the organic EL layer;
The interlayer insulating film has a light-transmitting property and has an opening that forms a light emitting portion by bringing the first electrode and the organic EL layer into contact with each other in an intersecting region of the first electrode and the second electrode. The transmissive organic EL display device according to any one of claims 1 to 15. 17. The transmissive organic EL display device according to claim 6, further comprising a stacked body that is stacked on the interlayer insulating film and has a top surface that is higher than a top surface of the organic EL layer. A sealing plate fixed to the support substrate so as to cover the display unit;
The transmissive organic EL display device according to claim 1, wherein the sealing plate has translucency. 19. The transmissive organic EL according to claim 1, further comprising a sealing thin film that has translucency and covers or covers the display unit and prevents or suppresses intrusion of moisture into the display unit. Display device. The transmissive organic EL display device according to any one of claims 1 to 19, further comprising a display unit capable of performing a display different from the display by the display unit on a back side of the display unit. The transmissive organic EL display device according to any one of Claims 1 to 20, wherein the second electrode has a cross-sectional shape in which a thickness is reduced from a central portion toward an edge portion.

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