JP5477963B2 - Transmission type color organic EL display - Google Patents

Description

  The present invention relates to a transmissive color organic EL display device, and more particularly to an organic EL display having both a see-through property capable of transmitting light and a color display function using a color filter.

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

  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. Further, as a method for colorizing a display, a three-color light emission method, a color filter method, and a color conversion method are broadly known.

  Among these methods, the color filter method generally includes red (R), green (G), and blue (B) filter elements in each pixel, and a light source that outputs white light (between the first electrode and the second electrode). The light from the organic EL layer) is converted into a specific color by passing through these filter elements. In this color filter system, the light-emitting layer can be composed of only one type of white, and fine coloration for each color element is not required unlike the three-color light-emitting system. It has the feature that it is advantageous for high definition.

  On the other hand, if an organic EL element is used, a transmissive display (so-called see-through display) can be configured. For example, a display installed on the back side of the screen is observed through the display from the front side of the screen. It is possible to switch between the front display by the display and the display at the back of the display by arranging the see-through display in front of various displays such as the instrument panel (vehicle meter) of the car. It is also possible. 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.

  In addition, there exist the following patent documents 1-6 as what discloses an organic EL display, Among these, patent documents 1-5 are related with a transmissive display, and patent document 6 is related with a color display.

JP 2001-148292 A JP 2002-289362 A JP 2002-334792 A JP 2005-108672 A JP 2006-234963 A JP 2003-257666 A JP 2001-57290 A

  By the way, the conventional transmission type display including the display of the said patent documents 1-5 cannot perform a color display by a monochromatic display screen, and is inferior in expressiveness by this point. The applicant previously made a proposal to solve the problem of the conventional transmissive organic EL display described later (Japanese Patent Application No. 2009-143302), but this also cannot perform color display.

  On the other hand, the displays described in Patent Document 6 (Japanese Patent Laid-Open No. 2003-257666) and Patent Document 7 (Japanese Patent Laid-Open No. 2001-57290) are capable of color display, but do not have transparency. Furthermore, even if the conventional transmissive display structure and color display structure are combined, a good see-through characteristic that allows the back of the display to be clearly seen and a color display characteristic that enables high-brightness and color reproducibility are displayed simultaneously. It is difficult to realize the provided display device.

On the other hand, the conventional transmissive organic EL display has the following problems.
That is, 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 in the past, and 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. In other words, 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 1 (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.

  Therefore, the object of the present invention is to solve the above-mentioned problems and to achieve a good see-through characteristic in which the back of the display can be clearly seen without complicating the device structure, and a good color with high brightness and good color reproducibility. The object is to realize a transmissive color organic EL display having display quality at the same time.

  In order to solve the above-described problems and achieve the object, a transmissive color organic EL display device according to the present invention includes a color filter element that is provided for each pixel and includes one or more color filter elements, and a first electrode having translucency. A plurality of organic EL elements, in which an organic EL layer and a second electrode are sequentially laminated on a translucent support substrate, are arranged two-dimensionally on the support substrate so as to constitute a pixel. The transmissive color organic EL display device provided with the display unit is arranged so that the second electrode is present only in a part of each pixel when viewed from a plane, and is arranged in an adjacent pixel. A gap was provided between the color filter elements, thereby forming a see-through region in the display portion where neither the second electrode nor the color filter element is arranged and light can be transmitted.

  The display device according to the present invention is based on a so-called color filter system in which light from an organic EL layer that is a light-emitting portion passes through a color filter disposed on the screen display side, but imparts a see-through characteristic that allows the back of the screen to be seen through. Therefore, a unique structure different from the conventional one is provided. Specifically, it is as follows.

  In the display device of the present invention, the organic EL elements constituting the respective pixels of the display unit are first provided on the lower surface side of the organic EL layer that is a light emitter (the side closer to the support substrate between the front and back surfaces of the organic EL layer). The electrode is composed of an electrode having translucency (hereinafter sometimes referred to as “translucent electrode” or “transparent electrode”). The first electrode may be formed of, for example, ITO (Indium Tin Oxide / Indium Tin Oxide). The constituent material of the first electrode is not limited to ITO, 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 second electrode provided on the upper surface side of the organic EL layer (the side farthest from the support substrate of the organic EL layer) is formed so as to spread over the entire pixel when viewed from the plane in each pixel as in the past. Instead, it is formed so that the second electrode is arranged only in a part thereof. Along with this, a gap is provided between the color filter elements arranged in adjacent pixels, and both of the second electrode and the color filter element are not arranged by these configurations, and the see-through light can be transmitted. A region is formed in the display portion.

  A color filter has the advantage that it can be colored without complicating its structure, while it absorbs light other than a specific color, so its light transmittance is low (generally about 30%), which is an obstacle to see-through. Can be. Therefore, in the present invention, as described above, the color filters of the pixels adjacent to each other between the color filter elements arranged in each pixel (in particular, in the direction intersecting (for example, orthogonal to) the direction in which the second electrode extends) A gap is provided between the element and the color filter element, and light can pass through the display portion through the gap.

  The color filter element is not limited to this, but typically, the first color filter has a first color (for example, red, which may be hereinafter referred to as “R”) constituting the three primary colors. A second filter element having a filter element, a second color (eg, green, hereinafter referred to as “G”), and a third color (eg, blue; hereinafter referred to as “B”). The color filter element which consists of 3 types of filter elements which consist of these 3 type filter elements which have each R, G, and B color is arrange | positioned in each pixel.

  Note that the color filter element referred to in the present invention does not necessarily have to be composed of the three primary colors (filter elements), and may include, for example, four or more colors, or only one or two colors. For example, an organic EL layer (organic EL material) that emits white light is used, and the light from the organic EL layer is passed through a filter element of a specific color (for example, blue, green, orange, and other various colors). The present invention can also be applied to a case where (monochromatic) screen display is performed.

  Conventionally, in a display using a color filter, a thin film having a light shielding property between color filter elements of adjacent pixels and between filter elements of each color (for example, a boundary portion of each RGB color) in order to prevent a decrease in contrast due to color mixing ( For example, a black matrix made of a chromium film or the like is generally provided (see Patent Document 6).

  However, such a light shielding film is contrary to the light transmittance (see-through characteristic) of the display, and the light transmittance of the display is lowered. Therefore, in the present invention, a black matrix is not provided between adjacent color filter elements and between filter elements in each pixel. Thereby, the light transmittance of a display part can be improved. Even if the black matrix is not provided as described above, in the present invention, a gap is provided between the color filter elements and between the filter elements. This causes a problem that the color display quality is deteriorated due to color mixing or the like. Can be prevented.

  The second electrode may be formed of a single-layer or multiple-layer thin film of a low-resistance metal or alloy. For example, a metal thin film such as aluminum, silver, a silver-magnesium alloy, or calcium can be used. 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, for example, a common electrode (scanning electrode).

  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 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 light transmitting property is secured by using a transparent electrode as an electrode disposed on both surfaces of an organic EL layer. However, in such a conventional display, even if the material used is devised, the transparent electrode has at most a transmittance of about 50 to 90%. On the other hand, according to the display device of the present invention, in the see-through area, there is no electrode on the arrangement side of the second electrode, so that the area is 10% to 50% light transmissive as compared with the conventional see-through display. An improvement in the rate can be expected.

  In the present invention, for the first electrode, for example, the area of the first electrode existing in the see-through region is increased by increasing the gap between the first electrodes or by reducing the width of the first electrode in the see-through region. May be reduced. According to such a structure, in the see-through region, not only both the second electrode and the color filter element but also the portion where the first electrode does not exist increases, and the light transmittance of the see-through region can be further increased. Furthermore, the light transmittance of the display unit can also be increased by widening the see-through region in each pixel (reducing the area occupied by the second electrode and the color filter element in the pixel).

  In addition, if the see-through area is widened in each pixel, the light transmittance of the display portion is increased accordingly, but conversely, the area where the first electrode, the organic EL layer, and the second electrode are stacked to emit light (hereinafter referred to as “light emission”). (Referred to as “light emitting area”) becomes smaller. Therefore, the size of the see-through region (arrangement area of the second electrode and the filter element 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 area to the light-emitting area 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 changed freely and easily just by changing the size (area occupied in the pixel), and has the advantage that it can flexibly meet the specifications and requirements required for the see-through display.

  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 or adjacent sub pixels (filter element portions)). In addition to having electrical insulation, the interlayer insulation film is assumed to have translucency in order to ensure light transmission of the display portion in the see-through region. Note that materials that can be used for such an interlayer insulating film will be described later in the description of the embodiment.

  Furthermore, the said interlayer insulation film shall have an opening which makes a 1st electrode and an organic electroluminescent layer contact in the cross | intersection area | region of a 1st electrode and a 2nd electrode, and forms a light emission part. It is desirable that the opening has a width larger than the width of the second electrode when viewed from a plane. This is because even if the second electrode is displaced during the stacking, the electrode does not come out of the opening and a predetermined luminance can be obtained.

  Further, it is preferable that the opening is smaller than the filter element when viewed from a plane, and the edge (entire circumference) of the opening is formed inside the outer edge of the filter element. This is to prevent the light emitting portion from being detached from each filter element even if the interlayer insulating film (opening) is displaced, and to prevent the color reproducibility from deteriorating.

  Further, the dimensional relationship between the second electrode and the filter element will be described. In the present invention, the width of the filter element may be larger than the width of the second electrode. This is to prevent the second electrode from being detached from the filter element even if the second electrode is misaligned (therefore, the light emitting portion) from being removed from the filter element, and preventing the color reproducibility from being deteriorated.

  On the other hand, as another aspect of the present invention, conversely, the width of each filter element may be smaller than the width of the second electrode. According to such a device structure, a display with a small filter portion and a high light transmittance of the display unit can be configured.

A typical structure of the display unit in the present invention will be described 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 first electrode and the second electrode includes a plurality of strip-shaped electrodes extending in parallel with a predetermined interval, and the first electrode and the second electrode are arranged in the pixel when viewed from a plane. The filter elements are arranged at positions where the first electrode and the second electrode intersect with each other, and the second electrode crosses a pair of opposing sides of the pixel and is smaller than the length of the side. Have a width.

  In one embodiment of the present invention, a filter region in which light emitted from the organic EL layer passes through the filter element by disposing the filter element in the intersection region of the first electrode and the second electrode. And an unfiltered light region in which the emitted light from the organic EL layer is emitted without passing through the filter element because the filter element is not disposed.

  According to such an aspect, while performing color display by the emitted light from the filtered region that passes through the filter element, the brightness of the display screen is increased by the emitted light from the non-filtered region that does not pass through the filter element. I can do it. Further, by changing the area ratio between the filtered region and the non-filtered region in each pixel, it is possible to adjust the color (tone / tone) of the screen.

  Further, in the present invention, the surface of the second electrode facing the organic EL layer may be a mirror surface. This is because the emitted light obtained from the organic EL layer is reflected by the mirror surface to the first electrode side (front side of the display unit) to increase the luminance of the display unit. If the area of the see-through region is increased to increase the light transmittance of the display portion, the light-emitting region is correspondingly reduced. However, according to the structure, a reduction in luminance can be suppressed.

  Further, when the mirror surface is formed on the second electrode as in the present invention or as described above, the organic EL layer on the side facing the second electrode is formed before the second electrode is formed on the organic EL layer. It is preferable to devise a method for flattening the surface. This is to improve the reflectivity by increasing the smoothness of the mirror surface. This flattening method is not particularly limited. For example, the organic EL layer may be smoothed by mechanical or physical treatment (for example, polishing), or the organic EL layer is formed using a material that can be made liquid or liquid when forming a thin film such as a conductive polymer. By doing so, planarization is possible.

  A plurality of the second electrodes may be provided for each pixel. If the second electrode crossing each pixel is not composed of a single electrode but divided into a plurality of thinner electrodes, the second electrode (especially the color filter element and the color filter adjacent in the extending direction of the second electrode) The presence of the second electrode between the elements and between the filter elements in each pixel becomes inconspicuous, and the light transmittance when viewed as the entire display unit (easy to see behind the display unit) Can be improved.

  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, and further guides light guided in the substrate to the display surface side. You may produce the said laminated body in a taper shape, a reverse taper shape, etc. so that light may be emitted.

  Conventionally, a partition 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. 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. Even if the material of the second electrode is uniformly deposited on the display unit by vapor deposition or the like without using a striped pattern mask, the adjacent second electrode is separated by the step formed by the partition, and the partition and This utilizes the fact that a striped second electrode can be formed 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), and therefore, a laminated body such as the above partition is not necessarily required. . However, if a laminated body standing on the interlayer insulating film like the partition is provided, a layer (for example, an organic EL layer) already formed is damaged by a mask used when forming the second electrode. Can be prevented. 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. This makes it difficult to constrain material selection. 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, it is easier to increase the light transmittance of the display if the number of arranged columnar structures (density to be installed) is small. However, it is necessary to prevent contact of the mask due to bending of the pattern mask or contact force. Since the installation density changes, 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 support substrate and small / narrow on the far side.

  Moreover, in this invention, the sealing board fixed to the support substrate so that a display part may be covered may be further provided. This 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 and thickness 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 0.1 to 10 μm. These sealing thin films may contain 10% or less of hydrogen.

  In the present invention, the second electrode may have a cross-sectional shape that becomes thinner as it goes from the center to the edge. When the second electrode has such a structure, when the sealing thin film is provided, the edge of the second electrode is satisfactorily covered by the thin film, and defects due to poor coating (for example, generation of dark spots due to intrusion of moisture) are caused. It can be made difficult to occur.

  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). This light (light emitted from the display means or light reflected by the display means) may be transmitted through the see-through region so as to be visible from the front side of the display unit.

  According to such a display device, for example, it is possible to switch and display an image of a see-through display arranged at the front and a display by the display means arranged at the rear, or to perform a combined display. 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 lighting device is provided as the display means, for example, if the lighting device is a light emitter capable of emitting light of various colors, the light emitted from the light emitter and an image by a see-through color organic EL display arranged on the front surface By combining the two, various image expressions can be performed.

  Furthermore, in the present invention, photovoltaic means for converting light into electric power (means for converting light energy into electricity using the photovoltaic effect of a solar cell or the like) is provided on the back side of the display unit (behind the back of the display unit). You may prepare. When the photovoltaic power generation means is provided in this way, not only a display function but also a power generation function can be given to a device to which the present invention is applied (for example, a portable electronic device such as a mobile phone). Moreover, according to the structure of the present invention, since the photovoltaic power generation means is incorporated in the back surface of the display, the arrangement space in the apparatus housing can be used efficiently, and the electronic apparatus incorporating the display device according to the present invention can be reduced in size. Can be

  For example, when combining a display that is not see-through and a solar cell, that is, if an electronic device is provided with both a display function and a photovoltaic power generation function, each of them would conventionally require a space for the arrangement. It will become. In addition, when the display and solar cells cannot be placed in the same plane due to the restrictions on the placement space, it is necessary to place the solar cells on the side and back of the display, making it difficult to simultaneously function the display function and the power generation function. There is a case. On the other hand, according to the structure of the present invention as described above, a solar cell is provided on the back surface of the display unit, and light can be supplied to the solar cell by light transmitted through the see-through region. However, it is possible to generate electric power as long as the light is applied to the display unit at the same time (while viewing the display).

  According to the present invention, a transmissive color organic material having a good see-through characteristic in which the back of the display can be clearly seen and a good color display quality with high luminance and good color reproducibility without complicating the device structure. An EL display can be realized.

  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. It should be noted that the present invention is not limited to the following embodiments, and it will be apparent to those skilled in the art that various modifications can be made within the scope of the claims. Moreover, in each figure, the same code | symbol shows the same or an equivalent part.

FIG. 1 is a plan view showing a transmissive color organic EL display device (back side) according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the display device (AA cross section in FIG. 1) according to the first embodiment. FIG. 3 is an enlarged plan view schematically showing a part of the display device (part B in FIG. 1) according to the first embodiment (the sealing thin film and the sealing plate are omitted). FIG. 4 is a diagram schematically showing a cross-sectional structure (cross section D1-D1 in FIG. 3) of the display device according to the first embodiment. FIG. 5 is a diagram schematically showing a cross-sectional structure (cross section D2-D2 in FIG. 3) of the display device according to the first embodiment. FIG. 6 is a plan view showing the arrangement of color filters in the display device of the first embodiment. FIG. 7 is a plan view showing the arrangement of anodes (ITO / first electrodes) in the display device of the first embodiment. FIG. 8 is a plan view showing the arrangement of interlayer insulating films in the display device of the first embodiment. FIG. 9 is a plan view schematically showing an enlarged part of the display device according to the modification of the first embodiment, similar to FIG. FIG. 10 is a diagram schematically showing a cross-sectional structure of a display device according to a modified example of the first embodiment in a cross section similar to that of FIG. FIG. 11 is an enlarged cross-sectional view of the cathode provided in the display device of the first embodiment. FIG. 12 is an enlarged cross-sectional view showing another configuration example of the cathode provided in the display device of the first embodiment. FIG. 13 is a plan view schematically showing an enlarged part of the transmissive color organic EL display device according to the second embodiment of the present invention in the same manner as FIG. 3 (the sealing thin film and the sealing plate are shown in FIG. (Omitted). FIG. 14 is a view schematically showing a cross-sectional structure (E1-E1 cross section of FIG. 13) of the display device according to the second embodiment. FIG. 15 is a diagram schematically showing a cross-sectional structure (cross section E2-E2 of FIG. 13) of the display device according to the second embodiment. FIG. 16 is a plan view schematically showing an enlarged part of the transmissive color organic EL display device according to the third embodiment of the present invention in the same manner as FIG. 3 (the sealing thin film and the sealing plate are shown in FIG. (Omitted). FIG. 17 is a diagram schematically showing a cross-sectional structure (cross-section FF in FIG. 16) of the display device according to the third embodiment. FIG. 18 is a plan view showing the arrangement of filters in the display device of the third embodiment. FIG. 19 is a plan view schematically showing an enlarged part of the display device according to the modification of the third embodiment in the same manner as FIG. 3 (the sealing thin film and the sealing plate are omitted). FIG. 20 is a plan view schematically showing a part of the transmissive color organic EL display device according to the fourth embodiment of the present invention in the same manner as in FIG. 3 (the sealing thin film and the sealing plate are shown in FIG. (Omitted). FIG. 21 is a diagram schematically showing a cross-sectional structure (a GG cross section in FIG. 20) of the display device according to the fourth embodiment. FIG. 22 is a plan view showing the arrangement of filters in the display device of the fourth embodiment. FIG. 23 is a plan view showing the arrangement of filters in a conventional color organic EL display device. FIG. 24 is a diagram schematically showing a cross-sectional structure (corresponding to the cross section of FIG. 4) of the conventional color organic EL display device. FIG. 25 is a diagram schematically showing a cross-sectional structure (corresponding to the cross section of FIG. 5) of the conventional color organic EL display device.

[First Embodiment]
As shown in FIGS. 1 to 2, the transmissive color organic EL display device 11 according to the first embodiment of the present invention is a flat glass substrate 12 having translucency (hereinafter simply referred to as “substrate”). The organic EL display unit 13 (hereinafter referred to as “display unit”) formed on the surface of the glass substrate 12, the sealing thin film 14 covering the display unit 13, and the sealing thin film 14. A sealing plate 15 for further covering and sealing the display unit 13, an IC (Integrated Circuit) 16 for driving the display unit 12, and an FPC (Flexible Printed Circuit board) connected to the IC 16 17. In FIG. 2, reference numeral 51 indicates another display means and photovoltaic power generation means (solar cell) described above. In this way, another display or solar cell may be provided on the back side of the display unit 13 as described above. Is possible.

  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 FIGS. 3 to 8, the color filter (filter element) 21 is covered on the glass substrate 12, and the color filter 21 is covered and protected. An overcoat layer 22 for flattening the surface, an anode (first electrode) 23 that is a transparent electrode, an insulating film (interlayer insulating film) 24 that electrically insulates adjacent anodes 23, and an organic layer that includes a light emitting layer The EL layer 25 and the cathode (second electrode) 26 are sequentially stacked. The display device 11 of this embodiment is a bottom emission type that emits display light to the glass substrate 12 side (downward in FIGS. 2, 4 and 5), and the IC drives the display unit 13 by a passive matrix method. To do.

  In this embodiment, the color filter includes a total of three filter elements 21 for each of R, G, and B filter elements. Each filter element 21 has a rectangular planar shape that is long in the extending direction of the anode 23, and is formed in a so-called island shape with a gap therebetween. That is, in each pixel, the filter elements 21 are not in contact with each other and are arranged at a constant interval W11 when viewed from the plane, and adjacent pixels are also located between the filter elements 21 and 21. (Alternatively, between a color filter element composed of R, G, and B provided in a certain pixel and a color filter element composed of R, G, and B provided in another pixel adjacent to the pixel) Similarly, a gap W12 is provided.

  In particular, in this embodiment, adjacent to the direction (the y-axis direction in FIG. 1 / the vertical direction in FIG. 3) perpendicular to the direction in which the cathode 26 described later extends (the x-axis direction in FIG. 1 / the horizontal direction in FIG. 3). A large gap W12 (wider than the gap W11 between the filter elements in the direction in which the cathode 26 extends) is provided between the filter elements 21 or the color filter elements. As a result, the see-through region 31 in which the cathode 26 and the filter element 21 do not exist and transmits light well can be formed between the cathode 26 and the cathode 26 in a stripe shape parallel to the cathode 26. The display device 11 having good see-through characteristics (light transmittance) can be realized.

  In addition, the formation method in particular of the color filter element which has such a pattern is not ask | required. For example, it may be formed by a vapor phase method such as vapor deposition or sputtering through a predetermined pattern mask, or photolithography technology (including photoresist coating, exposure through a pattern mask, development and etching steps) is used. (Anode 23 and interlayer insulating film 24 described later are also the same).

  A light shielding film such as a black matrix is not provided between the filter elements 21. This is to form a see-through region 31 through which light can pass. The width (short side length) of each filter element 21 is substantially the same as the width of the anode 23, and the filter elements 21 and the anode 23 are arranged so as to overlap each other. Further, the overcoat layer 22 is provided on the color filter elements arranged on the substrate 12 as described above. The overcoat layer 22 has translucency, protects the color filter element (filter element 21), and flattens the substrate surface on which the color filter is formed. It may consist of layers.

  The anode 23 is formed of ITO (Indium Tin Oxide / indium tin oxide). The anodes 23 are arranged on the overcoat layer 22 in parallel with each other in stripes so that three pixels pass through each pixel corresponding to the R, G and B filter elements 21 constituting the color filter element. Prepare for. Further, lead wires 19 are connected to the respective ends of the anodes 23, 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. To do. Similarly, the cathode 26 described later is connected to the lead wire 18 at each end portion (end portion of the display unit 13) of the cathode 26, 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 insulating film (interlayer insulating film) 24 has translucency, in particular, has a high transmittance in the visible light region (transmittance is 80% or more in the visible light region) and is as close as possible to colorless and transparent. Is preferred. This is to increase the light transmittance of the see-through region 31 and improve the function as a see-through display. In addition, the 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 23 does not affect the display quality. Specifically, the insulating film 24 is formed 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, polycyclo It can be formed from an olefin resin or the like.

  The insulating film 24 includes an opening 24a having a substantially rectangular planar shape. The openings 24a are disposed at positions above the filter elements 21 corresponding to the filter elements 21, and the openings 24a are formed so as to fit inside the outer periphery of the filter elements 21 when viewed from above. The organic EL layer 25 is laminated on the insulating film 24 so as to be in contact with the anode 23 through the openings 24 a provided in the insulating film 24.

  As described above, the organic EL layer 25 may have various laminated structures. However, the organic EL layer 25 has a light-transmitting property and is formed of a substantially colorless and transparent organic material when formed. Configure. 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 25 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 in this order on the anode 23 (insulating film 24). Can be formed.

  A cathode 26 is disposed on the organic EL layer 25. The number of cathodes 26 corresponding to the number of pixels is provided in parallel with each other in a stripe shape, but may be more than the number corresponding to the number of pixels if necessary, and each cathode 26 is orthogonal to the anode 23 when viewed from above. Arrange to do. In the present embodiment, each cathode 26 has a width W1 narrower than the width W1 of the filter element 21 and the width W2 of the opening of the interlayer insulating film, and is substantially at the center position of the pixel region (opening 24a and filter element 21). The organic EL layer 25 is disposed on the upper surface of the organic EL layer 25 so as to sandwich the organic EL layer 25 together with the anode 23. When the cathode 26 has such an arrangement structure, even if the cathode 26 is slightly displaced from side to side (in a direction perpendicular to the extending direction of the cathode 26) due to stacking deviation, the cathode 26 can be removed from the opening 24a and the filter element 21. Therefore, the luminance and color reproducibility are not deteriorated, and the display image quality can be prevented from deteriorating.

  Further, a portion sandwiched between the cathode 26 and the anode 23 (a crossing portion between the anode 23 and the cathode 26 when viewed from the plane) becomes a light emitting region, and the emitted light is transmitted through the anode 23 and glass. 4 and 5 are emitted toward the substrate 12 and pass through the filter element 21 to become light of a specific color and are emitted from the lower surface of the glass substrate 12.

  The lower surface 26a of the cathode 26 (the surface on the organic EL layer 25 side / the surface on the display display surface side) may be a mirror surface. This is because the light emitted from the organic EL layer 25 is reflected to the display surface side by the lower surface 26a of the cathode 26 having a mirror surface to obtain a high-luminance display device. In addition, in order to increase the reflectance of the mirror surface, a process for flattening the surface of the organic EL layer 25 as a lower layer may be performed before the cathode 26 is formed. As described above, this flattening process forms the organic EL layer 25 using a material that can be made liquid or liquid when forming a thin film such as a mechanical or physical process (for example, polishing) or a conductive polymer. It is sufficient to use a method such as As a constituent material of the cathode 26, for example, a metal having a low electrical resistance such as aluminum, silver, or a silver-magnesium alloy is used.

  The step of the cathode 26 preferably has a cross-sectional shape in which the film thickness decreases from the pattern center to the pattern edge in order to improve the coverage when the sealing thin film 14 is formed. As shown in FIGS. 11 and 12, the cathode 26 has a trapezoidal cross-sectional shape, and the top surface of the cathode 26 is the top surface of the organic EL layer 25 at both left and right edges. An inclined surface (tapered surface) 26c is formed so as to have a downward slope (also in the second embodiment described later). It is desirable that the inclined surfaces 26c on both sides 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 serving as the boundary with the top surface of the organic EL layer 25, the inclination angle θ of the inclined surface 26c has a small angle of 30 ° or less, more preferably 1 ° or less.

  The inclined surface 26c does not need to be a flat surface, and may be a curved surface 66c that is curved (dented downward) as in the cathode 66 shown in FIG. If the inclined surface 66c is such a curved surface, the thickness of the central portion of the cathode 66 is increased to reduce the electric resistance, and at the same time, the inclination angle θ of the edge portion of the cathode 66 is made extremely small. Thus, the coverage with the sealing thin film 14 can be improved.

  When the metal thin film for forming the cathodes 26 and 66 is deposited, the glass substrate 12 is rotated so that the metal is attached to the substrate 12 from various angles. Thus, the cathodes 26 and 66 having the inclined surfaces 26c and 66c as described above at the edges 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 26 and 66 is set to 30 ° or less, the sealing thin film 14 cleanly covers the pattern edges, and defects due to defective coating (for example, generation of dark spots due to intrusion of moisture). Can be made difficult to occur. In addition, the cross-sectional shape of the cathode (second electrode) in the present invention is not necessarily limited to the above shape, and may be, for example, a square (rectangular or square) cross-sectional shape.

  A sealing thin film 14 is provided on the cathode 26. 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 the cathode 26 is formed, 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 above embodiment in which the sealing thin film 14 is provided, there is no need to provide a desiccant installation region, and there is an advantage that the display device 11 can be reduced in size.

  In this embodiment, as shown in FIGS. 9 to 10, each cathode 26 passing through each pixel may be constituted by a plurality of electrodes 26b thinner than the cathode of the first embodiment. If the cathode 26 is divided into a plurality of thin electrodes 26b as described above, the presence of the cathode 26 becomes inconspicuous without increasing the electric resistance, reducing the amount of emitted light (brightness), and light transmittance (behind the display portion). Visibility) can be improved. In the figure, an example is shown in which each pixel is divided into three electrodes 26b. However, the number of the electrodes 26b is not limited to this, and may be two or four or more. is there.

  Furthermore, in this embodiment, as indicated by reference numeral 32 in FIGS. 9 to 10, it is stacked on the interlayer insulating film 24 and is higher than the organic EL layer 25 (a ceiling higher than the top surface of the organic EL layer 25). An insulating film (laminated body) 32 similar to a conventional element isolation layer (cathode partition wall) having a surface may be further provided. In the present invention, as already described, the cathode 26 having a predetermined width is typically formed by a vapor deposition method using a mask, and the cathode material is deposited (uniformly) over the entire display portion as in the past. Therefore, a structure such as a conventional cathode barrier rib is not necessarily required for forming the cathode 26. However, if the insulating film 32 similar to the above partition is provided, it is possible to prevent the organic EL layer 25 from being damaged by the mask when the cathode 26 is formed. Such an insulating film 32 may also be formed in the second to fourth embodiments described later.

[Second Embodiment]
As shown in FIG. 13 to FIG. 15, the transmissive color organic EL display device according to the second embodiment of the present invention has a smaller filter element 21 than the display device of the first embodiment. . Specifically, this display device has the same stacked structure as the display device of the first embodiment, but each filter element 21 has a substantially square planar shape and fits within the width of the cathode 26 (cathode 26). ) Having a width dimension W10. In addition, each opening 24a of the interlayer insulating film 24 has a substantially square planar shape according to the shape of the filter element, and has a size W20 that fits inside the outer edge of each filter element.

  According to such a second embodiment, the see-through region 31 having a wide width W22 can be formed between the cathode 26 and the cathode 26, and the light transmittance of the display unit can be further enhanced. Also in this embodiment, the magnitude relationship between the opening 24a of the filter element 21 and the interlayer insulating film 24 and the cathode width is opposite to that of the first embodiment, but the cathode 26 is slightly left and right due to misalignment. Even if the position is shifted, the opening 24a of the filter element 21 and the interlayer insulating film 24 is not detached from the cathode 26, and it is possible to prevent the display image quality from being deteriorated as in the first embodiment.

[Third Embodiment]
As shown in FIGS. 16 to 18, the transmissive color organic EL display device according to the third embodiment of the present invention includes a filter element in the light emitting region where the anode 23, the organic EL layer 25 and the cathode 26 overlap. By arranging 21, the filtered region 61 in which the emitted light 71 from the organic EL layer 25 passes through the filter element 21 and the emitted light 72 from the organic EL layer 25 without the filter element 21 being arranged are filtered. And an unfiltered light region 62 that emits light without passing through.

  More specifically, the display device of the present embodiment has the same laminated structure as the display device of the first embodiment, but the length W41 of the filter element 21 in the extending direction of the cathode 26 is It is shorter than the display device of the first embodiment. Thus, the filtered region 61 and the non-filtered region 62 are formed in the light emitting region where the anode 23 and the cathode 26 intersect. The width of each filter element 21 is larger than the width of the cathode 26 as in the first embodiment, and each filter element 21 is arranged so that the cathode 26 is within the width of the filter element 21.

  According to the present embodiment, color display is performed by the emitted light 71 from the filtered region 61 that passes through the filter element 21, while the luminance of the display screen is increased by the emitted light 72 from the non-filtered region 62. I can do it. In addition, it is possible to achieve the same luminance with less power consumption compared to a conventional display device. Further, by changing the length W41 of the filter element 21, it is possible to adjust the color (tone / tone) of the screen. In addition, since the width of the filter element 21 is larger than the width of the cathode 26 and the cathode 26 is slightly displaced in the left-right direction due to misalignment, the filter element 21 does not come off from the cathode 26. Can also be prevented.

  In this embodiment, unlike the first and second embodiments, the overcoat layer 22 is formed so as to surround the filter element 21 (that is, the thickness of the overcoat layer 22 and the thickness of the filter element 21). The overcoat layer 22 is formed between the filter element 21 and the filter element 21 so that the top surface of the overcoat layer 22 and the top surface of the filter element 21 are flush with each other. Even in the form, the overcoat layer 22 may be formed so as to cover the top surface of the filter element 21 as in the first embodiment (FIGS. 4 to 5) and the second embodiment (FIGS. 14 to 15). Good (the same applies to the fourth embodiment described later). Conversely, the overcoat layer 22 in the first and second embodiments may be the overcoat layer 22 surrounding the filter element 21 as in this embodiment (FIG. 17).

  Furthermore, as shown in FIG. 19, the width W42 of the filter element 21 can be formed small. Further, the width W42 of the filter element 21 may be further reduced so as to fit within the width of the cathode 26 as in the second embodiment shown in FIG. According to such a configuration, the light transmittance of the display unit 13 can be improved by reducing or eliminating the area of the filter element 21 existing in the see-through region 31 between the cathodes 26 and 26.

[Fourth Embodiment]
As shown in FIGS. 20 to 22, the transmissive color organic EL display device according to the fourth embodiment of the present invention includes an anode 23, an organic EL layer 25, and a cathode 26, as in the third embodiment. The light-emitting region overlapped includes a light-filtering region 61 and a non-light-filtering region 62, and each filter element 21 includes a plurality (two in this example) of filter element portions 21a. These filter element portions 21a are arranged so as to overlap one edge and the other edge of the cathode 26 (so that each edge of the cathode 26 passes through a substantially central position of each filter element portion 21a). Then, the filtered region 61 is formed, and the non-filtered region 62 where the filter element portion 21a does not exist is formed between the two filter element portions 21a and 21a.

  Also in this embodiment, as in the third embodiment, the luminance can be improved by the emitted light 72 passing through the non-filtered light region 62, and the size of the filter element portion 21a and both filter element portions 21a can be improved. , 21a can be adjusted by changing the interval between them. Even in the present embodiment, even if the cathode 26 is shifted to the left or right due to a stacking shift, since the filter element portions 21a are arranged at the respective edges of the cathode 26, it is possible to prevent the color from changing.

  When the filtered region 61 and the non-filtered region 62 are formed in the light emitting region in this way, the filter element 21 (not only one of the edges) is provided on both edges of the cathode 26 as in the present embodiment. The filter element portion 21a) is disposed, or conversely, the filter element 21 (filter element portion 21a) is not disposed on both edges of the cathode 26 (in this case, the filter is disposed only in the center portion in the width direction of the cathode 26). It is preferable that the element 21 or the filter element portion 21a be disposed) in that the variation in color can be suppressed even if the cathode 26 is shifted left and right due to the stacking error.

  The shape pattern of the filtered region 61 and the non-filtered region 62 (the shape of the filter element 21 and the filter element portion 21a in the light emitting region) is, for example, the filtered region 61 (filter element) so as to surround the non-filtered region 62. 21 or the filter element portion 21a) can be used in addition to the above embodiment. In addition, it is good also as a structure which has the filter element 21 (filter element part 21a) which has not only the above but different color in one pixel. In this case, it is possible to realize a desired color by appropriately selecting the filter element 21 (filter element portion 21a).

  As a comparative example of the above embodiment, FIGS. 23 to 25 show an example of a conventional color filter type organic EL display device. 23 is a plan view corresponding to FIG. 3, FIG. 24 is a cross-sectional view corresponding to FIG. 4, and FIG. 25 is a cross-sectional view corresponding to FIG. As shown in these drawings, in the conventional apparatus structure, light from the back side of the display (upper part of FIGS. 24 and 25) is blocked by the cathode 46 and cannot pass through the display portion. Even if it is an electrode, since the color filter 41 and the black matrix 42 are formed on the entire surface of the display portion, the light transmittance is extremely low and it does not practically function as a see-through display. On the other hand, according to the embodiment of the present invention, the light from the back of the display unit can be transmitted through the see-through region 31 to the front surface of the display unit without complicating the device structure (laminated structure). An excellent see-through display can be constructed.

DESCRIPTION OF SYMBOLS 11 Transmission type organic electroluminescent display device 12 Glass substrate 13 Organic electroluminescent display part 14 Sealing thin film 15 Sealing board 16 Display part drive IC
17 FPC
18, 19 Lead wiring 21, 41 Color filter (filter element)
21a Filter element part 22 Overcoat layer 23 Anode (first electrode)
24 Interlayer insulating film 24a Opening of interlayer insulating film 25 Organic EL layer 26, 46, 66 Cathode (second electrode)
26a Lower surface of the cathode (mirror surface)
26b Electrode constituting the cathode 26c Side surface of the cathode (inclined surface)
31 See-through region 32 Element isolation layer (cathode barrier)
42 Black matrix 51 Another display means (display) or photovoltaic power generation means (solar cell)
61 filtered region 62 non-filtered region 71 emitted light that has passed through the filter element 72 emitted light that has not passed through the filter element

Claims (18)

A color filter element including one or more color filter elements provided for each pixel, a translucent first electrode, an organic EL layer, and a second electrode are sequentially stacked on a translucent support substrate. A transmissive color organic EL display device having a display unit in which a plurality of organic EL elements formed in a two-dimensional array on the support substrate so as to constitute pixels,
When viewed from the plane, the second electrode is disposed so as to exist only in a part of each pixel, and a gap is provided between the color filter element and the color filter element disposed in the adjacent pixel,
Thus, a see-through region in which both the second electrode and the color filter element are not disposed and light can be transmitted is formed 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. The transmissive color organic EL display device according to claim 1. The organic EL elements are arranged in a matrix on the support substrate, and
The pixel has a square planar shape,
The transmissive color organic EL display device includes, as the first electrode and the second electrode, a plurality of strip-like electrodes extending in parallel with a certain interval,
The first electrode and the second electrode are substantially orthogonal to each other in each pixel when viewed from the plane.
The filter element is disposed at a position where the first electrode and the second electrode intersect,
3. The transmissive color organic EL display device according to claim 1, wherein the second electrode has a width that traverses a pair of opposing sides of the pixel and is smaller than a length of the side. The color filter element has a first filter element having a first color constituting the three primary colors, a second filter element having a second color constituting the three primary colors, and a third color constituting the three primary colors. A third filter element for each pixel,
Each of the first to third filter elements is disposed at a distance from each other when viewed from above, and includes a black matrix between the filter elements and between the adjacent color filter elements. The transmissive color organic EL display device according to any one of claims 1 to 3. The transmissive color organic EL display device according to claim 1, wherein a width of the filter element is larger than a width of the second electrode. The first electrode and the organic EL layer are laminated so as to be interposed between the first electrode and the organic EL layer. Comprising an interlayer insulating film having an opening for contacting the organic EL layer to form a light emitting portion;
The transmissive color organic EL display device according to claim 1, wherein a width of the opening is larger than a width of the second electrode. The transmissive color organic EL display device according to claim 1, wherein a width of the filter element is smaller than a width of the second electrode. The first electrode and the organic EL layer are laminated so as to be interposed between the first electrode and the organic EL layer. Comprising an interlayer insulating film having an opening for contacting the organic EL layer to form a light emitting portion;
The transmissive color organic EL display device according to any one of claims 1 to 7, wherein the opening is located inside an outer edge of the filter element when viewed from a plane. In the intersecting region of the first electrode and the second electrode,
A filtered region in which the filter element is disposed and light emitted from the organic EL layer passes through the filter element;
The transmissive color according to any one of claims 1 to 8, further comprising: an unfiltered light region in which the filter element is not disposed and light emitted from the organic EL layer is emitted without passing through the filter element. Organic EL display device. The transmissive color organic EL display device according to any one of claims 1 to 9, wherein a surface of the second electrode facing the organic EL layer is a mirror surface. 11. The transmission according to claim 1, wherein the surface of the organic EL layer facing the second electrode is planarized before the second electrode is formed on the organic EL layer. Type color organic EL display. The transmissive color organic EL display device according to any one of claims 1 to 11, wherein a plurality of the second electrodes are provided for each pixel. The first electrode and the organic EL layer are laminated so as to be interposed between the first electrode and the organic EL layer. An interlayer insulating film having an opening for contacting the organic EL layer to form a light emitting portion;
The transmissive color organic EL display device according to any one of claims 1 to 12, further comprising: a laminated body laminated on the interlayer insulating film and having a top surface higher than the top surface of the organic EL layer. . A sealing plate fixed to the support substrate so as to cover the display unit;
The transmissive color organic EL display device according to any one of claims 1 to 13, wherein the sealing plate has translucency. The organic EL display according to any one of claims 1 to 14, further comprising a sealing thin film that has translucency and covers or covers the display unit and prevents or suppresses the intrusion of moisture into the display unit. apparatus. The transmissive color organic EL display device according to any one of claims 1 to 15, wherein the second electrode has a cross-sectional shape that becomes thinner as it goes from the center to the edge. When the surface on the image display side of the display unit is the front surface and the surface of the display unit opposite to the front surface is the back surface, a display different from the display by the display unit is performed on the back surface side of the display unit. The transmissive color organic EL display device according to any one of claims 1 to 16, further comprising display means capable of performing the following. When the surface of the display unit on the image display side is the front surface and the surface of the display unit opposite to the front surface is the back surface, the display unit further includes a photovoltaic power generation unit that converts light into electric power on the back surface side of the display unit. The transmissive color organic EL display device according to any one of claims 1 to 16.

Images