JP2010040191A - Organic el display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem in the configuration in which each subpixel arranges light emitting elements of the same color on the light extraction side of a base, wherein a color shift occurs in color emission from light emitting elements of the same color between subpixels and the light emission efficiency of the light emitting elements arranged on a lower layer deteriorates owing to absorption when light emitted from one light emitting element passes through another light emitting element existing in the path of the light, resulting in a rise in the power consumption required per pixel to achieve the same brightness. <P>SOLUTION: This organic EL display includes at least one or more pixels. The pixel is composed of a first subpixel and a second subpixel. The first subpixel and the second subpixel differ in the number of light emitting elements each of which includes an organic layer including at least a light emitting layer, sandwiched between electrodes. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an organic EL display device used for a light emitting display, a surface light source, and the like.

  In recent years, self-luminous devices compatible with flat panel displays have attracted attention. Examples of the self-luminous device include a plasma light-emitting element, a field emission element, and an electroluminescence (EL) element. In particular, organic EL elements are being researched and developed energetically, and area color type arrays with colors such as green, red, and blue have been commercialized and are now full color. Development is actively underway.

  A display device that performs full-color display has a structure in which organic EL elements that emit light in red (hereinafter referred to as R), green (hereinafter referred to as G), and blue (hereinafter referred to as B) are arranged in parallel. Alternatively, one having a structure in which a plurality of organic EL elements that emit light having different emission colors is stacked is known.

  The light-emitting device described in Patent Document 1 is an example of a structure in which a plurality of organic EL elements are stacked. One pixel is composed of two sub-pixels, and the first sub-pixel exhibits a first emission color. A first organic light emitting layer and a third organic light emitting layer exhibiting a third emission color are stacked with an electrode interposed therebetween.

  In the second sub-pixel, a second organic light-emitting layer showing the second light emission color and a third organic light-emitting layer showing the third light emission color are stacked with an electrode interposed therebetween. The first organic light emitting layer and the second organic light emitting layer are juxtaposed, and the third organic light emitting layer is formed in both the first and second subpixels.

  With such a structure, one pixel can be composed of three subpixels so far and one pixel and two subpixels, and high definition can be easily achieved.

Moreover, since the 3rd organic light emitting layer can take the light emission area twice as large as the 1st and 2nd organic light emitting layer, the lifetime of a 3rd organic light emitting layer can be aimed at.
Japanese Patent Laid-Open No. 2005-174639

  As in Patent Document 1, in the configuration in which the light emitting elements of the same color are arranged on the light extraction side of each subpixel, there is a problem that a color shift occurs in the color development from the light emitting elements of the same color between the subpixels.

  This is because the light emission wavelength of each color of the two color light emitting elements configured above or below the same color light emitting element is different, and if the film thickness is varied to optimize the light emission wavelength, the optical interference depending on the film thickness. This is because the conditions are also different.

  This will be described in more detail.

  When light emission occurs in the light emitting layer of each EL layer, the light is repeatedly extracted, reflected, refracted, transmitted, absorbed, and the like due to a difference in refractive index and absorption coefficient of each constituent layer. The amount of light extracted increases as the light passing through various paths interfere with each other and strengthen each other.

  When the influence of interference is considered, the interference effect between the light directly traveling from the light emitting position in the light extraction direction and the light reflected from the reflection surface of the reflective electrode and then traveling in the extraction direction becomes the largest.

At this time, by satisfying the following relational expression (1), an improvement in extraction efficiency due to interference is expected.
2L / λ + δ / 2π = m (1)
(In the formula, L is the optical distance between the light emitting region of the light emitting layer and the reflective surface of the reflective electrode, δ is the phase shift amount δ in the reflective electrode, and m is a natural number.)
The formula (1) is described in the document Deppe J. Modern. In Optics Vol 41, No. 2, p325 (1994), it is derived from the interference enhancement conditions of the EL emission spectrum in the resonance structure.

  Table 1 shows the optimum optical path length for each of the R, G, and B emission colors in the case of m = 2 in accordance with the interference conditional expression (1). Here, since the phase shift in the reflective metal film is approximately π, δ is calculated as π.

  As can be seen from Table 1, the appropriate optical path length varies depending on the emission wavelength to be enhanced.

  That is, since the respective emission colors have different wavelength characteristics, the optimum optical distance is different. For example, in the case of the same order m, the film thickness of the R light emitting element having a long wavelength is larger than the film thickness of the B light emitting element or the G light emitting element.

  When two subpixels of the same color are arranged in parallel in the upper layer as in Patent Document 1, the film thicknesses that are the optimum optical distances are different as described above. Therefore, the light emitting elements of the same color formed on or under them have different interference effects due to the difference in film thickness of the light emitting elements of the two colors, and the color of the light emitting element varies depending on the region while being the light emitting layer of the same color. The image quality deteriorates because the purity decreases.

  Note that this deterioration in image quality is not limited to the case where two subpixels are arranged in parallel in the same color in the upper layer. That is, even when two subpixels of the same color are arranged in parallel in the lower layer, if the thickness of the light emitting layer of different colors arranged on the upper layer is different, the interference conditions are similarly different, and the color development differs depending on the region even though the light emitting layer is of the same color. As a result, the color purity is lowered and the image quality is lowered.

  Further, in the configuration of Patent Document 1, absorption occurs when light emitted from one of the light emitting elements passes through the light emitting element existing in the light passage path, and as a result, the light emitting efficiency of the light emitting elements arranged in the lower layer is reduced. End up. As a result, the power consumption per pixel necessary to obtain the same brightness is emitted in red (hereinafter referred to as R), green (hereinafter referred to as G), and blue (hereinafter referred to as B). There is a problem that the size becomes larger than that of an organic EL device having a structure in which organic EL elements are arranged in parallel.

  The present invention has been made in order to solve the above-described problems of the prior art, and has a configuration in which an organic light emitting layer is laminated, and an organic EL with low power consumption while maintaining high image quality and high color purity. A display device is provided.

The organic EL display device of the present invention includes at least one pixel, and the pixel includes two subpixels including at least a first subpixel and a second subpixel, and the subpixel includes at least a light emitting layer. In an organic EL display device comprising a light emitting element formed by sandwiching an organic layer containing an electrode and causing the light emitting layer to emit light by applying a voltage between the electrodes of the light emitting element.
An organic EL display device in which the number of light emitting elements stacked on the substrate of the first subpixel and the second subpixel is different.

  According to the present invention, while maintaining the characteristics that an organic EL device that stacks a plurality of organic EL elements that emit light of different emission colors can easily achieve high definition, while maintaining high image quality with excellent color purity, the luminous efficiency is also high. It is possible to provide a good organic EL device.

(Embodiment 1)
Hereinafter, embodiments of a display device according to the present invention will be described with reference to the drawings.

  FIG. 1A is a principle diagram for one pixel in the organic EL display device according to the first embodiment of the time-division driving method of the present invention. In FIG. 1A, 1 is an insulating substrate, 2 is a reflective first electrode, 3 is a reflective second electrode, 4 is a transmissive or semi-transmissive intermediate electrode, and 5 is transmissive. It is an upper electrode which has the property or semi-transparency. Here, an organic layer including a light emitting layer is sandwiched between the first electrode 2 and the intermediate electrode 4, between the intermediate electrode 4 and the upper electrode 5, and between the second electrode 3 and the upper electrode 5. . In addition, 10 is a power supply means, 11 is a first light emitting element, 12 is a second light emitting element, and 13 is a third light emitting element.

  The pixel P constituting the light emitting device of the present embodiment includes a first subpixel P1 and a second subpixel P2, and the first subpixel P1 includes the first light emitting element 11 and the second light emitting element 12. In this configuration, two stacked light emitting elements are stacked. On the other hand, the second sub-pixel P <b> 2 has a single light-emitting element composed of the third light-emitting element 13.

  Further, the electrodes on the light extraction side of the substrate in the second light emitting element 12 and the third light emitting element 13 are constituted by a common electrode, that is, the upper electrode 5.

  One pixel P is composed of P1 and P2, and each light-emitting element is driven in a time-sharing manner at a high-speed cycle exceeding human visibility by a driving waveform of the power supply means 10, and displays an arbitrary color and luminance. Is done.

  Such pixels P are arranged in a matrix to form an organic EL display device as shown in FIG.

  Details will be described in Example 1 described later.

  The organic EL display device may be a top emission type or a bottom emission type. In the case of the top emission type, the first electrode 2 and the second electrode 3 have reflectivity, and the intermediate electrode 4 and the upper electrode 5 have translucency.

  On the other hand, in the case of the bottom emission type, the substrate 1 and the first electrode 2, the second electrode 3 and the intermediate electrode 4 formed on the substrate have translucency, and the upper electrode 5 has reflectivity. Have.

(Embodiment 2)
FIG. 1B is a principle diagram for one pixel in the organic EL display device according to the second embodiment of the time-division driving method of the present invention. In FIG. 1B, 1 is an insulating substrate, 2 is a reflective first electrode, 4 is a transmissive or semi-transmissive intermediate electrode, and 5a and 5b are transmissive or semi-transmissive upper portions. Electrode.

  Here, between the first electrode 2 and the intermediate electrode 4, between the intermediate electrode 4 and the upper electrode 5a (first upper electrode), and between the first electrode 4 and the upper electrode 5b (second upper electrode), Organic layers each including a light emitting layer are sandwiched.

  In addition, 10 is a power supply means, 11 is a first light emitting element, 12 is a second light emitting element, and 13 is a third light emitting element. As shown in FIG. 1B, in this embodiment, the electrode on the insulating substrate 1 side, that is, the first electrode is used as a common electrode between the subpixels P1 and P2. Each light-emitting element is driven in a time-sharing manner with a high-speed cycle exceeding the human visual sensitivity by the driving waveform of the power supply means 10 to display an arbitrary color and luminance.

  Such pixels P are arranged in a matrix to form an organic EL display device as shown in FIG. Details will be described in Example 2 described later.

  The organic EL display device may be a top emission type or a bottom emission type. In the case of the top emission type, the first electrode 2 has reflectivity, and the intermediate electrode 4 and the upper electrodes 5a and 5b have translucency.

  On the other hand, in the case of the bottom emission type, the substrate 1, the first electrode 2 and the intermediate electrode 4 are translucent, and the upper electrodes 5a and 5b are reflective.

(Embodiment 3)
FIG. 1C is a principle diagram for one pixel in the simultaneous drive type organic EL display device of the present invention. In FIG. 1C, 1 is an insulating substrate, 2 is a reflective first electrode, 3 is a reflective second electrode, 6 is a transmissive or semi-transmissive third electrode, This is an upper electrode having transparency or translucency.

  Here, between the first electrode 2 and the third electrode 6, between the third electrode 6 and the upper electrode 5, and between the second electrode 3 and the third electrode 6, an organic layer including a light emitting layer is sandwiched, respectively. It is.

  In addition, 10 is a power supply means, 11 is a first light emitting element, 12 is a second light emitting element, and 13 is a third light emitting element. As shown in FIG. 1C, in the present embodiment, the third electrode 6 is used as a common electrode between the subpixels P1 and P2. One pixel P is composed of P1 and P2, and such pixels P are arranged in a matrix to form an organic EL display device as shown in FIG. Details will be described in Example 3 described later.

  The organic EL display device is a top emission type, the first electrode 2 and the second electrode 3 are reflective, and the third electrode 6 and the upper electrode 5 are translucent.

  In addition, the well-known or well-known technique of the said technical field is applied regarding the part which is not illustrated or described in particular in this specification. The embodiment described below is one embodiment of the present invention and is not limited thereto.

  This example relates to an organic EL display device of a first form in which three light emitting layers are driven in a time division manner. As described in the first embodiment, the pixel P constituting the light emitting device of the present embodiment includes the first sub-pixel P1 and the second sub-pixel P2. The first sub-pixel P1 has a configuration in which two light-emitting elements in which the first light-emitting element 11 and the second light-emitting element 12 are stacked, and the second sub-pixel P2 has a single light emission composed of the third light-emitting element 13. It is the structure of an element. Further, the electrodes on the light extraction side of the substrate in the second light emitting element 12 and the third light emitting element 13 are constituted by a common electrode, that is, the upper electrode 5.

As for the relationship between the viewing angle characteristic and the m value in (Equation 1) described in the subject of the invention, the smaller the m, the better the viewing angle characteristic. That is, when viewed from an oblique direction θ radians with respect to the light emitting surface, the expression (1) is rewritten as the following expression.
2L · COSθ / (λ-Δλ) + δ / 2π = m (2)
Here, Δλ is a shift amount of the peak wavelength when viewed from the oblique direction θ with respect to the peak wavelength λ of the emission spectrum when the light emitting surface is viewed from the front. From equation (2)
Δλ = λ−2L · COSθ / (m−δ / 2π) (3)
Thus, as m is smaller, Δλ is smaller.

  As described above, when m is smaller, a sufficient color reproduction range can be secured in a wide viewing angle.

  In addition, about said viewing angle, FIG.10 and FIG.11 of WO01 / 039554 can also be referred. Here, it is described that the smaller the m, the smaller the shift amount of the peak wavelength of the extracted light when viewed from the oblique direction.

  Moreover, since the value of m tends to increase as the emission peak wavelength increases, the viewing angle characteristics can be improved by arranging the light emitting layer with a shorter emission peak wavelength closer to the reflective electrode.

  That is, it is preferable that the B light emitting element having a short emission peak wavelength is disposed near the reflective electrode, and the R light emitting layer having a long emission peak wavelength is disposed farthest from the reflective electrode.

  For the above-described reason, the second light emitting element 12 disposed in the upper layer when the two light emitting elements are stacked in the present invention is preferably an R light emitting element.

  In addition, the third light emitting element having the single light emitting element configuration of the second subpixel P2 has a light emission efficiency higher than that of the first light emitting element disposed in the lower layer of the stacked structure of the two light emitting elements in the first subpixel P1. High power consumption. The reason is that there is no other light emitting element in the light passage path, and no light loss due to absorption or reflection occurs.

  Therefore, it is preferable that the third light emitting element is a light emitting element having the shortest light emission lifetime among the first light emitting element to the third light emitting element.

  In particular, since the light emitting lifetime of the B light emitting element is short at present, the third light emitting element is preferably B.

  This is also preferable from the viewpoint of viewing angle characteristics as described above.

  Here, when a B light-emitting element having a short emission peak wavelength is disposed in the upper layer or the lower layer of the two-light-emitting element laminated structure, the organic light-emitting layer showing the color of G or R disposed in the upper layer or the lower layer of the B light-emitting element is photoexcited. There is also a problem that light emission occurs and color mixture with B occurs, resulting in a color shift of B.

  In order to solve such a problem, the B light emitting element is preferably a third light emitting element having a single light emitting element configuration.

  For this reason, in the present embodiment, the third light emitting element is a B light emitting element, the second light emitting element is an R light emitting element, and the first light emitting element is a G light emitting element.

  However, the color configuration of each light emitting element is not limited, and can be arbitrarily set according to the following various problems.

  For example, if the light emitting life of R or G light emitting elements is the shortest due to future trends in material development, there is no problem even if the third light emitting element is R or G.

  Further, in this example of the present invention, a step is generated between the subpixel P1 in which two light emitting elements are stacked and the subpixel P2 in a single light emitting element configuration due to the difference in the number of stacked light emitting elements. For this reason, there is a problem that a short circuit between the intermediate electrode 4 and the upper electrode 5 in FIG.

  To solve this problem, a method in which the R light emitting element is configured as a single light emitting element can be employed. As described in the problem of the invention, when the optimum optical film thicknesses of the R, G, and B light emitting elements are compared, the order is R light emitting element> G light emitting element> B light emitting element. Therefore, by setting the R light emitting element having the largest film thickness as a single light emitting element structure and forming the thin B and G light emitting elements in a two light emitting element stacked structure, the film thickness difference between subpixels is reduced. As a result, a short circuit between electrodes can be suppressed.

  In this case, from the viewpoint of improving the viewing angle characteristics, it is better to dispose the light emitting layer having a shorter light emission wavelength closer to the reflective electrode as described above. That is, it is preferable to arrange B in the first light emitting element arranged in the lower layer of the two light emitting element laminated structure and arrange G in the second light emitting element arranged in the upper layer of the two light emitting element laminated structure.

  Hereinafter, the manufacturing method of the display device of this embodiment will be described in detail.

  FIG. 3 is a schematic plan view of one pixel in Embodiment 1 of the light emitting device of the present invention. 4A, 4B, and 4C are cross-sectional views taken along lines A-A ', B-B', and C-C 'in FIG. Hereinafter, this embodiment will be described in detail with reference to FIGS. 3 and 4.

  3 and 4, 1 is an insulating substrate, 21 is a first electrode, 22 is a second electrode, 23 is a connection electrode, and 24 is an intermediate electrode. Furthermore, 20a, 20b, 25a, 25b, 26a, 26b, and 26c are contact holes, 27 is a partition opening (showing a so-called display area region), 28 is a gate insulating layer, 29 is an insulating layer, and 30 is flattened. Is a layer. Further, 31a and 31b are TFT pixel circuits, 32 is a partition, 33 is a first organic light emitting layer, 34 is a second organic light emitting layer, 35 is a third organic light emitting layer, and 36 is an upper electrode.

  As the insulating substrate 1, Si, glass, a plastic substrate, or the like can be used.

  A planarization layer 30 is provided on the TFT pixel circuits 31a and 31b. The reason for providing the planarizing layer 30 is to prevent light emission abnormality such as short-circuit (short circuit) from occurring in the upper light emitting element due to the unevenness of the TFT pixel circuit.

  On the planarizing layer 30, the first electrode 21, the second electrode 22, and the connection electrode 23 are formed in a pattern. As shown in FIG. 3, the first electrode 21 and the connection electrode 23 are formed in the first subpixel P1 region, and the second electrode 22 is formed in the second subpixel P2 region. The first electrode 21, the second electrode 22, and the connection electrode 23 are electrically separated from each other.

  Here, as shown in FIG. 4A, the connection electrode 23 is connected to the TFT pixel circuit 31 a through the contact hole 20 a of the planarization layer 30. Further, as shown in FIG. 4B, the second electrode 22 is connected to the TFT pixel circuit 31b through the contact hole 20b of the planarization layer 30.

  The first electrode 21 and the second electrode 22 are preferably light-reflective members, and are preferably made of a material such as Cr, Al, Ag, Au, Pt, or an alloy thereof. This is because the higher the reflectance, the higher the light extraction efficiency. Further, the first electrode 21 has a configuration in which the reflection function is ensured by the light reflecting member as described above and the function as the electrode is secured by a transparent conductive film such as an ITO film formed on the light reflecting member. And included in the second electrode 22. In this case, the reflecting surface is the surface of the light reflecting member.

  The connection electrode 23 is not necessarily a light-reflective member, but when the first electrode 21 and the second electrode 22 are formed in a pattern by using the same material as the first electrode 21 and the second electrode 22. Patterns can be formed at the same time.

  As a method for forming the first electrode 21, the second electrode 22, and the connection electrode 23, a vapor deposition method, a sputtering method, an ion plating method, or the like is preferable. As a pattern forming method, a known method such as a photolithography method or a mask film forming method can be used.

  As shown in FIG. 3, the partition wall 32 is formed on the entire surface except for the partition opening 27 and the contact holes 25a and 25b corresponding to the display area region of each subpixel. Here, as shown in FIGS. 3 and 4A, the contact hole 25a is formed in a region where the connection electrode 23 is present in the lower layer, and the contact hole 25b is a region where the first electrode 21 is present in the lower layer. Formed. Here, the contact hole 25b is not necessarily formed for each pixel, and may be formed in units of a plurality of pixels. The shape of each contact hole may be square or circular, and is not particularly limited. A known material can be widely used as the material of the partition wall 32 as long as it is an insulator, but an organic material such as acrylic or polyimide, or an inorganic material such as SiN or SiO 2 can be used. The partition wall 32 only needs to have a sufficient thickness to exhibit insulation, but specifically, about 0.01 μm to 5 μm is preferably used. A photolithography method is suitable as the patterning method.

  As shown in FIGS. 3 and 4A, the first organic light emitting layer 33 is formed on the first electrode 21 in the first subpixel P1 region.

  The first organic light emitting layer 33 can be made of an organic light emitting material and at least one selected from a hole injection material, an electron injection material, a hole transport material, and an electron transport material. The range of color selection can be expanded by doping the hole injection material or the hole transport material with an organic light emitting material, or doping the electron injection material or the electron transport material with an organic light emitting material. Furthermore, the organic light emitting layer is preferably an amorphous film from the viewpoint of light emission efficiency.

  Organic light-emitting materials for each color include triarylamine derivatives, stilbene derivatives, polyarylenes, aromatic condensed polycyclic compounds, aromatic heterocyclic compounds, aromatic heterocyclic condensed ring compounds, metal complex compounds, etc., and single oligos or composites thereof. Oligobodies can be used. However, the configuration of the present invention is not limited to the exemplified materials.

  The organic light emitting layer may be a layer having a single function of hole injection, hole transport, electron injection, or electron transport, or a layer having a composite function.

  The thickness of the organic light emitting layer is preferably about 0.05 μm to 0.3 μm, and preferably about 0.05 to 0.15 μm.

  As the hole injection and transport material, a phthalocyanine compound, a triarylamine compound, a conductive polymer, a perylene compound, an Eu complex, or the like can be used, but the structure of the present invention is not limited.

  As an example of the electron injection and transport material, Alq3 in which a trimer of 8-hydroxyquinoline is coordinated to aluminum, an azomethine zinc complex, a distyrylbiphenyl derivative system, or the like can be used.

  In the present embodiment, the first organic light emitting layer 33 has a structure in which a hole transport material / organic light emitting material / electron transport material / electron injection material are sequentially laminated. The organic light emitting material is a material exhibiting G color.

  In the first organic light emitting layer 33, contact holes 26a and 26b are formed at the same positions as the contact holes 25a and 25b of the partition walls, respectively. Here, the contact holes 26a and 26b are preferably formed so as to include the contact holes 25a and 25b of the partition walls, respectively. By forming in this way, the electrical connection between the intermediate electrode 24 and the connection electrode 23 described later and the electrical connection between the first electrode 21 and the upper electrode 36 can be made more reliable. it can. As a method for forming the contact holes 26a and 26b, laser processing is preferable, and known methods generally used for thin film processing such as YAG laser (including SHG and THG) and excimer laser can be used. By irradiating these laser beams to a few μm or by irradiating the first organic light emitting layer 33 in a predetermined pattern through a mask that transmits a contact hole portion as a planar light source, a desired pattern is obtained. A contact hole can be formed at the position. The diameter of the contact hole is preferably 2 μm to 15 μm.

  As shown in FIG. 3, the intermediate electrode 24 is formed in the region of the partition opening 27 and the contact holes 25a and 26a indicating the display area region in the subpixel P1. On the other hand, the intermediate electrode 24 is not formed on the contact holes 25b and 26b.

  The intermediate electrode 24 is preferably made of a material having high transmittance, and is preferably made of a transparent conductive film such as ITO, IZO, ZnO, or an organic conductive film such as polyacetylene. Alternatively, a semi-transmissive film in which a metal material such as Ag or Al is formed with a thickness of about 10 nm to 30 nm may be used. As a patterning method for the intermediate electrode 24, an electrode material may be formed on the entire display region, and then the above laser processing may be performed. Alternatively, the intermediate electrode 24 may be selectively formed using a shadow mask. As a result, the intermediate electrode 24 is connected to the connection electrode 23 via the contact holes 25a and 26a, and further connected to the TFT drive circuit 31a via the contact hole 20a.

  As shown in FIGS. 3 and 4A, the second organic light emitting layer 34 is formed on the intermediate electrode 24 in the first subpixel P1 region. Here, the 2nd organic light emitting layer 34 was set as the structure which laminated | stacked hole transport material / organic light emitting material / electron transport material / electron injection material one by one. Further, the organic light emitting material is a material exhibiting R color. As a film forming method and patterning method for the second organic light emitting layer 34, the same method as that for the first organic light emitting layer 33 can be used. Further, as shown in FIG. 4C, it is preferable that the second organic light emitting layer 34 is formed so as to cover the end portion of the intermediate electrode 24. By forming in this way, it is possible to prevent the upper electrode 36 and the intermediate electrode 24 disposed on the second organic light-emitting layer 34 from being short-circuited in the subsequent process. In the second organic light emitting layer 34, a contact hole 26c is formed at the same position as the contact holes 25b and 26b of the partition wall. Here, the contact hole 26c is preferably formed so as to include the contact hole 25b of the partition wall. By forming in this way, the electrical connection between the upper electrode 36 and the first electrode 21 described later can be ensured. As a method for forming the contact hole 26c, a method similar to that for the contact holes 26a and 26b of the first organic light emitting layer 33 described above can be used.

  As shown in FIGS. 3 and 4B, the third organic light emitting layer 35 is formed on the second electrode 22 in the second subpixel P2 region. Here, the third organic light emitting layer 35 has a structure in which a hole transport material / organic light emitting material / electron transport material / electron injection material are sequentially laminated. In addition, the organic light emitting material is a material exhibiting B color. As a film forming method and a patterning method for the third organic light emitting layer 35, the same methods as those for the first organic light emitting layer 33 and the second organic light emitting layer 34 can be used.

  The upper electrode 36 is formed over the entire area of the subpixel P1 and the subpixel P2. The upper electrode 36 is disposed as a common electrode in the first subpixel and the second subpixel, and can be disposed as a common electrode between the pixels, so that it is formed over the entire surface of the plurality of pixel regions. As a result, the upper electrode 36 and the first electrode 21 are electrically connected through the contact holes 25b, 26b, and 26c of the partition wall 32, the first organic light emitting layer 33, and the second organic light emitting layer 34, respectively. That is, the upper electrode 36 and the first electrode 21 are supplied with the same potential. The upper electrode 36 can be made of the same material and forming method as the intermediate electrode 24.

  As described above, the first subpixel P1 includes the first light emitting element 11 of FIG. 1A including the first electrode 21 / first organic light emitting layer 33 / intermediate electrode 24, and the intermediate electrode 24 / second organic light emitting layer. 34 / upper electrode 36, the second light emitting element 12 of FIG. On the other hand, the second sub-pixel P2 has a single element configuration of the third light-emitting element 13 in FIG. 1A composed of the second electrode 22 / the third organic light-emitting layer 35 / the upper electrode 36.

  An equivalent circuit of the organic EL display device thus formed is shown in FIG.

  Each subpixel includes a light emitting element in which switching TFTs 101a and 101b and driving TFTs 102a and 102b are stacked, and capacitors 103a and 103b. Here, the driving TFTs 102a and 102b correspond to the TFT pixel circuits 31a and 31b, respectively, in FIG. Here, the gate electrodes of the switching TFTs 101 a and 101 b are connected to the gate signal line 105. The source regions of the switching TFTs 101a and 101b are connected to the source signal lines 106a and 106b, and the drain regions are connected to the gate electrodes of the driving TFTs 102a and 102b. The source regions of the driving TFTs 102a and 102b are connected to the power supply line 107, the drain region is connected to an electrode at one end of the light emitting element, that is, the intermediate electrode 24 in the subpixel P1, and the second electrode in the subpixel P2. 22 is connected. The electrode at the other end of the light emitting element is connected to the first electrode 21 or the upper electrode 36. The first electrode 21 and the upper electrode 36 are electrically connected, and the same voltage is supplied from the power supply means 10 via the electrode wiring 108. The capacitors 103a and 103b are formed so that the electrodes are connected to the gate electrodes of the driving TFTs 102a and 102b and GND. In this way, the driving TFTs 102a and 102b and the light emitting elements are connected in series, and the current flowing through the light emitting elements is controlled by the driving TFTs 102a and 102b in accordance with the data signals supplied from the source signal lines 106a and 106b. The light emission is controlled by.

  Next, a driving method of the organic EL display device of this embodiment will be described with reference to FIGS. FIG. 6 is a diagram illustrating an example of a driving waveform of the organic EL display device.

  When the potential of the gate signal line 105 is set to Vg at time t1, the switching TFTs 101a and 101b are turned on. Thereby, the potential Vsig1 of the source signal lines 106a and 106b is charged to the gate capacitances of the capacitors 103a and 103b and the driving TFTs 102a and 102b via the switching TFTs 101a and 101b.

  At time t2, the potential of the gate signal line 105 is set to 0V, the switching TFTs 101a and 101b are turned off, and the voltages charged in the capacitors 103a and 103b are held.

  At time t3, the potentials of the first electrode 21 and the upper electrode 36 are set to Vc from the power supply means 10 through the electrode wiring 108. At this time, since the power supply line 107 remains at 0 V, a potential difference is generated between the organic light emitting layer and the source and drain of the driving TFTs 102a and 102b. Accordingly, electrons are injected from the intermediate electrode 24 into the first organic light emitting layer 33 and holes are injected from the first electrode 21 to obtain light emission. This emitted light is emitted from the upper surface side of the panel. The second organic light emitting layer 34 and the third organic light emitting layer 35 do not emit light because a reverse voltage is applied. The current flowing in the organic light emitting layer is controlled by the driving TFT 102a, and the current I1 flows between the source and drain of the driving TFT 102a according to the voltage charged in the capacitor 103a. This state is maintained until time t4.

  At time t4, the potentials of the first electrode 21 and the upper electrode 36 are set to 0V from the power supply means 10 through the electrode wiring 108. Then, since there is no potential difference between the organic light emitting layer and the source and drain of the driving TFTs 102a and 102b, the first organic light emitting layer 33 does not emit light. Subsequently, a signal Vsig2 for causing the second organic light emitting layer 34 and the third organic light emitting layer 35 to emit light is set to the source signal lines 106a and 106b.

  At time t5, when the potential of the gate signal line 105 is set to Vg, the switching TFTs 101a and 101b are turned on. Thereby, the potential Vsig2 of the source signal lines 106a and 106b is charged to the gate capacitances of the capacitors 103a and 103b and the driving TFTs 102a and 102b via the switching TFTs 101a and 101b.

  At time t6, the potential of the gate signal line 105 is set to 0V, the switching TFTs 101a and 101b are turned off, and the voltages charged in the capacitors 103a and 103b are held.

  At time t7, the potential of the power supply line 107 is set to Vc. At this time, since the potentials of the first electrode 21 and the upper electrode 36 are 0 V, a potential difference is generated between the organic light emitting layer and the source and drain of the driving TFTs 102a and 102b. As a result, electrons are injected from the upper electrode 36 into the second organic light emitting layer 34 and the third organic light emitting layer 35, and holes are injected from the intermediate electrode 24 and the second electrode 22, and excited by recombination of electrons and holes. Light emission is obtained when the organic molecules are relaxed to the ground state. This emitted light is emitted from the upper surface side of the panel. The first organic light emitting layer 33 does not emit light because a reverse voltage is applied. Currents flowing in the respective organic light emitting layers are controlled by the driving TFTs 102a and 102b, and a current I2 flows between the source and drain of the driving TFTs 102a and 102b in accordance with the voltages charged in the capacitors 103a and 103b. This state is maintained until time t8.

  At time t8, the potential of the power supply line 107 is set to 0V. Then, since there is no potential difference between the organic light emitting layer and the source and drain of the driving TFTs 102a and 102b, the second organic light emitting layer 34 and the third organic light emitting layer 35 do not emit light.

  By repeating the above operation, each organic light emitting layer can emit light in a time-sharing manner. Specifically, the light emission color of the first organic light-emitting layer 33 and the light emission of the second organic light-emitting layer 34 and the third organic light-emitting layer 35 are driven by a cycle that cannot be identified by humans, for example, about 60 Hz or higher. Light of any mixed color with color can be expressed.

  As described above, according to the present embodiment, the problem of color misregistration between subpixels in the emission color arranged on the light extraction side of the substrate is solved, and a display device with high color purity is obtained. Further, in the display device manufactured according to the present embodiment, power consumption during panel driving can be reduced as compared with the display device having the configuration of Patent Document 1.

  This example relates to an organic EL display device of a second form in which three light emitting layers are driven in a time-sharing manner. As described in the second embodiment, as shown in FIG. 1B, in this embodiment, the insulating substrate side electrode, that is, the first electrode is used as a common electrode between the subpixels P1 and P2. . In this embodiment, since the upper electrode is patterned so as to be electrically separated between the subpixels P1 and P2, the intermediate electrode and the upper electrode due to the step between the subpixels which are concerned in the organic EL display device of the first embodiment. There is an effect that the problem of short circuit between the two is eliminated.

  In addition, as long as there is no description in particular, the material and formation method equivalent to Example 1 can be used regarding each member which comprises this display apparatus.

  FIG. 7 is a schematic plan view of one pixel in Example 2 of the light emitting device of the present invention. 8A and 8B are cross-sectional views taken along lines A-A ′ and B-B ′ of FIG. 7. Hereinafter, this embodiment will be described in detail with reference to FIGS.

  7 and 8, 21 is a first electrode, 23a and 23b are connection electrodes, 42 is an intermediate electrode, 43a and 43b are upper electrodes, and 32 is a partition wall. Further, 20a, 20b, 25a, 25b, 25c, 26a, 26b, 26c, and 26d are contact holes, and 27 is a partition opening (showing a so-called display area region). Furthermore, 28 is a gate insulating layer, 29 is an insulating layer, 30 is a planarization layer, 31a and 31b are TFT pixel circuits, 33 is a first organic light emitting layer, 34 is a second organic light emitting layer, and 35 is a third organic light emitting layer. It is.

  Hereinafter, the manufacturing method of the display device of this embodiment will be described in detail.

  As the insulating substrate 1, Si, glass, a plastic substrate, or the like can be used.

  A planarization layer 30 is provided on the TFT pixel circuits 31a and 31b.

  On the planarization layer 30, the first electrode 21 and the connection electrodes 23a and 23b are patterned. As shown in FIG. 7, the first electrode 21 is formed over the first subpixel P1 and second subpixel P2 regions, the connection electrode 23a is formed in the first subpixel P1 region, and the connection electrode 23b is It is formed in the second subpixel P2 region. The connection electrodes 23a and 23b and the first electrode 21 are electrically separated from each other.

  Here, as shown in FIG. 8A, the connection electrodes 23a and 23b are connected to the TFT pixel circuits 31a and 31b through the contact holes 20a and 20b of the planarization layer 30, respectively.

  The first electrode 21 is preferably a light-reflective member, and is preferably made of a material such as Cr, Al, Ag, Au, Pt, or an alloy thereof.

  The connection electrodes 23a and 23b do not necessarily have to be light-reflective members, but by using the same material as the first electrode 21, the first electrode 21 can be patterned simultaneously.

  As shown in FIG. 7, the partition wall 32 is formed on the entire surface except for the partition opening 27 and the contact holes 25a, 25b, and 25c corresponding to the display area region of each subpixel.

  Here, as shown in FIGS. 7 and 8, the contact hole 25a is formed in a region where the connection electrode 23a exists in a lower layer, and the contact hole 25b is formed in a region where the connection electrode 23b exists in a lower layer. The The contact hole 25c is formed in a region where the first electrode 21 exists in the lower layer. Here, the contact hole 25c is not necessarily formed for each pixel, and may be formed for a plurality of pixels. The material of the partition wall 32 can be the same as that of the first embodiment.

  As shown in FIGS. 7 and 8A, the first organic light emitting layer 33 is formed on the first electrode 21 in the first subpixel P1 region. Here, the material and the layer configuration of the first organic light emitting layer 33 can be the same as those in the first embodiment. Further, contact holes 26a and 26c are formed in the first organic light emitting layer 33 at the same positions as the contact holes 25a and 25c of the partition wall, respectively. Here, the contact holes 26a and 26c are preferably formed so as to include the contact holes 25a and 25c of the partition walls. By forming in this way, the electrical connection between the upper electrode 43a and the 1st electrode 21 mentioned later can be ensured.

  As shown in FIGS. 7 and 8B, the third organic light emitting layer 35 is formed on the first electrode 21 in the second subpixel P2 region. The material and the layer configuration of the third organic light emitting layer 35 can be the same as those in the first embodiment. A contact hole 26b is formed in the third organic light emitting layer 35 at the same position as the contact hole 25b of the partition wall. Here, the contact hole 26b is preferably formed so as to include the contact hole 25b of the partition wall. By forming in this way, the electrical connection between the upper electrode 43b and the connection electrode 23b described later can be ensured.

  As shown in FIG. 7, the intermediate electrode 42 is formed on the display area region on the partition opening 27 and the contact holes 25a and 26a in the subpixel P1, but is not formed on the contact holes 25c and 26c. As a result, the intermediate electrode 42 is electrically connected to the connection electrode 23a through the contact holes 25a and 26a of the partition wall 32 and the first organic light emitting layer 33, and as a result, is connected to the TFT pixel circuit 31a.

  The intermediate electrode 42 is preferably made of a material having high transmittance, and is preferably made of a transparent conductive film such as ITO, IZO, ZnO, or an organic conductive film such as polyacetylene. Alternatively, a semi-transmissive film in which a metal material such as Ag or Al is formed with a thickness of about 10 nm to 30 nm may be used. As a patterning method for the intermediate electrode 42, an electrode material may be formed on the entire display region and then performed by the laser processing described above. Alternatively, the intermediate electrode 42 may be selectively formed using a shadow mask.

  As shown in FIGS. 7 and 8A, the second organic light emitting layer 34 is formed on the intermediate electrode 42 in the first subpixel P1 region. Here, the material and the layer configuration of the second organic light emitting layer 34 can be the same as those in the first embodiment. A contact hole 26 d is formed in the second organic light emitting layer 34 at the same position as the contact hole 25 c of the partition wall and the contact hole 26 c of the first organic light emitting layer 33. Here, the contact hole 26d is preferably formed so as to include the contact hole 25c of the partition wall. By forming in this way, the electrical connection between the upper electrode 43a and the 1st electrode 21 mentioned later can be ensured.

  As shown in FIG. 7, the upper electrode 43a is formed not only in the display area region on the partition opening 27 in the sub-pixel P1, but also in the positions of the contact holes 25c, 26c, and 26d. As a result, the upper electrode 43a and the first electrode 21 are electrically connected through the contact holes 25c, 26c, and 26d of the partition wall 32, the first organic light emitting layer 33, and the second organic light emitting layer 34, respectively. As a result, the same potential is supplied to the first electrode 21 and the upper electrode 43a.

  As shown in FIG. 7, the upper electrode 43b is formed on the display area region on the partition opening 27 and the contact holes 25b and 26b in the subpixel P2.

  As a result, the upper electrode 43b is electrically connected to the connection electrode 23b through the contact holes 25b and 26b of the partition wall 32 and the third organic light emitting layer 35, and as a result, is connected to the TFT pixel circuit 31b.

  The upper electrodes 43a and 43b can be selected from the same material and formation method as the intermediate electrode.

  As described above, in the first sub-pixel P1, the first light-emitting element 11 of FIG. 1B including the first electrode 21 / the first organic light-emitting layer 32 / the intermediate electrode 42, and the intermediate electrode 42 / second organic light-emitting element. This is a configuration in which the second light emitting element 12 of FIG. 1B composed of the layer 34 / the upper electrode 43a is laminated. Further, the second sub-pixel P2 has a single element configuration of the third light-emitting element 13 of FIG. 1B including the first electrode 21 / the third organic light-emitting layer 35 / the upper electrode 43b.

  An equivalent circuit of the light emitting device thus formed is shown in FIG. As for the drive waveform of the organic EL display device of this embodiment, the same waveform as that of Embodiment 1 can be used. That is, the drive waveforms of the potential waveforms of the first electrode and the upper electrode in FIG. 6 may be applied to the first electrode 21 and the upper electrode 43a in this embodiment.

  Hereinafter, the driving method of the light emitting element of this embodiment will be described with reference to FIG.

  First, as shown in FIG. 9A, the potentials of the first electrode 21 and the upper electrode 43a are set to Vc from the power supply means 10 through the electrode wiring 108, and the potentials of the intermediate electrode 42 and the upper electrode 43b are respectively set to the driving TFTs 102a. , 102b. As a result, the first organic light emitting layer 33 and the third organic light emitting layer 34 emit light.

  On the other hand, since a reverse voltage is applied to the second organic light emitting layer 34 of the first subpixel P1, no light is emitted.

  Next, as shown in FIG. 9B, the potentials of the first electrode 21 and the upper electrode 43a are set to 0 through the electrode wiring 108 from the power supply means 10, and the potentials of the intermediate electrode 42 and the upper electrode 43b are driven. Vc is set through the TFTs 102a and 102b. As a result, the second organic light emitting layer 34 emits light. On the other hand, the first organic light emitting layer 33 of the first subpixel P1 and the third organic light emitting layer 35 of the second subpixel P2 do not emit light because a reverse voltage is applied.

  By repeating the above operation, each organic light emitting layer can emit light in a time-sharing manner. Specifically, the light emission color of the first organic light-emitting layer 33 and the light emission of the second organic light-emitting layer 34 and the third organic light-emitting layer 35 are driven by a cycle that cannot be identified by humans, for example, about 60 Hz or higher. Light of any mixed color with color can be expressed.

  In the display device of the present embodiment, the same effect as that of the first embodiment can be obtained.

  Furthermore, in this embodiment, the upper electrode which is the electrode on the light extraction side of the substrate is patterned so as to be electrically separated between the subpixels P1 and P2. For this reason, the problem of short circuit (short circuit) between the intermediate electrode and the upper electrode due to the step between the sub-pixels, which has been a concern in the organic EL display device of Example 1, is solved.

In the first and second embodiments, the organic EL display device that drives the three light emitting layers in a time-sharing manner has been described.
This embodiment relates to an organic EL display device that simultaneously drives three light emitting layers. In addition, as long as there is no description in particular, the material and formation method equivalent to Example 1 can be used regarding each member which comprises this display apparatus.

  Hereinafter, the manufacturing method of the display device of this embodiment will be described in detail.

  FIG. 10 shows a schematic plan view of one pixel in Example 3 of the light emitting device of the present invention. 11A and 11B are cross-sectional views taken along lines A-A 'and B-B' in FIG. Hereinafter, the present embodiment will be described in detail with reference to FIGS. 10 and 11.

  10 and 11, 21 is a first electrode, 22 is a second electrode, 23 is a connection electrode, 63 is a third electrode, 64 is an upper electrode, and 32 is a partition wall. Further, 20a, 20b, 20c, 25, 26a, 26b, and 26c are contact holes, 1 is an insulating substrate, and 27 is a partition opening (showing a so-called display area region). Furthermore, 28 is a gate insulating layer, 29 is an insulating layer, 30 is a planarization layer, 31a, 31b, and 31c are TFT pixel circuits, 33 is a first organic light emitting layer, 34 is a second organic light emitting layer, and 35 is a third organic light emitting layer. It is a light emitting layer.

  As the insulating substrate 1, Si, glass, a plastic substrate, or the like can be used.

  A planarizing layer 30 is provided on the TFT pixel circuits 31a, 31b, and 31c.

  On the planarizing layer 30, the first electrode 21, the second electrode 22, and the connection electrode 23 are formed in a pattern. As shown in FIG. 10, the first electrode 21 and the connection electrode 23 are formed in the first subpixel P1 region, and the second electrode 22 is formed in the second subpixel P2 region.

  Here, as shown in FIG. 11A, the connection electrode 23 is connected to the TFT pixel circuit 31 a through the contact hole 20 a of the planarization layer 30. The first electrode 21 is connected to the TFT pixel circuit 31 b through the contact hole 20 b of the planarization layer 30. Further, as shown in FIG. 11B, the second electrode 22 is connected to the TFT pixel circuit 31c through the contact hole 20c of the planarization layer 30.

  As the first electrode 21, the second electrode 22, and the connection electrode 23, the same material and formation method as in Example 1 can be used.

  As shown in FIG. 10, the partition wall 32 is formed on the entire surface except the partition opening 27 and the contact hole 25 corresponding to the display area region of each subpixel. Here, as shown in FIG. 10, the contact hole 25 is formed in a region where the connection electrode 23 exists in the lower layer.

  As shown in FIG. 10, the first organic light emitting layer 33 is patterned on the first electrode 21 in the first subpixel P1 region. The material and the layer configuration of the first organic light emitting layer 33 can be the same as those in the first embodiment. In addition, a contact hole 26 is formed in the first organic light emitting layer 33 at the same position as the contact hole 25 of the partition wall. Here, the contact hole 26 is preferably formed so as to include the contact hole 25 of the partition wall. By forming in this way, the electrical connection between the upper electrode 64 and the connection electrode 23 described later can be made more reliable.

  As shown in FIG. 10, the third organic light emitting layer 35 is formed on the second electrode 22 in the second subpixel P2 region. The material and the layer configuration of the third organic light emitting layer 35 can be the same as those in the first embodiment.

  The third electrode 63 is formed over the entire area of the subpixel P1 and the subpixel P2. The third electrode 63 is preferably made of a material with high transmittance, and is preferably made of a transparent conductive film such as ITO, IZO, ZnO, or an organic conductive film such as polyacetylene. Alternatively, a semi-transmissive film in which a metal material such as Ag or Al is formed with a thickness of about 10 nm to 30 nm may be used. A contact hole 26b is formed in the third electrode 63. The contact hole 26 b is formed at the same position as the contact hole 25 of the partition wall 32 and the contact hole 26 a of the first organic light emitting layer 33. Here, it is necessary to form the contact hole 26b so as to necessarily include the contact hole 25c of the partition wall and the contact hole 26a of the first organic light emitting layer 33. This is because the third electrode 63 and the connection electrode 23 are prevented from being short-circuited. As a method for forming the contact hole 26b, laser processing is preferable, and known methods generally used for thin film processing such as YAG laser (including SHG and THG) and excimer laser can be used.

  As shown in FIG. 10, the second organic light emitting layer 34 is patterned on the third electrode 63 in the first subpixel P1 region. Here, the 2nd organic light emitting layer 34 is comprised so that a layer structure may become a reverse order with respect to the 1st organic light emitting layer 33 and the 3rd organic light emitting layer 35. FIG. That is, the second organic light emitting layer 34 has a configuration in which an electron injection material / electron transport material / organic light emitting material / hole transport material are sequentially laminated. As a result, the second organic light-emitting layer 34 has a polarity opposite to that of the first organic light-emitting layer 33 and the third organic light-emitting layer 35.

  Further, as shown in FIGS. 10 and 11A, a contact hole 26 c is formed in the second organic light emitting layer 34. The contact hole 26 c is formed at the same position as the contact hole 25 of the partition wall 32. Here, the contact hole 26c is preferably formed so as to include the contact hole 25 of the partition wall. By forming in this way, the electrical connection between the upper electrode 64 and the connection electrode 23 described later can be ensured. The contact hole 26 c needs to be formed so as to be included in the contact hole 26 b region of the third electrode 63. By forming the third electrode 63 in this way, the end portion of the third electrode 63 is covered with the second organic light emitting layer 34, so that the upper electrode 64 and the third electrode 63 to be formed thereafter are short-circuited. Can be suppressed.

  As shown in FIGS. 10 and 11A, the upper electrode 64 is patterned in the first subpixel P1 region. The upper electrode 64 is electrically connected to the connection electrode 23 through the contact holes 25, 26a, 26b, and 26c of the partition wall 32, the first organic light emitting layer 33, the third electrode 63, and the second organic light emitting layer 34, respectively. As a result, the TFT pixel circuit 31a is connected. The same material and formation method as the third electrode 63 can be selected for the upper electrode 64.

  As described above, in the first sub-pixel P1, the first light-emitting element 11 of FIG. 1C including the first electrode 21 / the first organic light-emitting layer 33 / the third electrode 63, and the third electrode 63 / second electrode. This is a configuration in which the second light emitting element 12 of FIG. The second sub-pixel P2 has a single element configuration of the third light-emitting element 13 in FIG.

  An equivalent circuit of the light emitting device thus formed is shown in FIG.

  As shown in FIG. 12, the potentials of the first electrode 21, the second electrode 22, and the upper electrode 64 are set to Vc2, Vc3, and Vc1 through the driving TFTs 102b, 102c, and 102a, respectively, and the potential of the third electrode 63 is set. Is set to 0 from the power supply means 10 through the electrode wiring 108. Holes are injected from the first electrode 21 and electrons are injected from the third electrode 63 into the first organic light emitting layer 33. As a result, the first organic light emitting layer 33 emits light. Similarly, holes are injected from the upper electrode 64 and electrons are injected from the third electrode 63 into the second organic light emitting layer 34. As a result, the second organic light emitting layer 34 emits light. Holes are injected from the second electrode 22 and electrons are injected from the third electrode 63 into the third organic light emitting layer 35. As a result, the third organic light emitting layer 35 emits light. The current flowing through the first organic light emitting layer 33 is controlled by the driving TFT 102b, the current flowing through the second organic light emitting layer 34 is controlled by the driving TFT 102a, and the current flowing through the third organic light emitting layer 35 is controlled by the driving TFT 102c. It is controlled by.

  In this way, the first organic light emitting layer 33, the second organic light emitting layer 34, and the third organic light emitting layer 35 can emit light simultaneously.

  An arbitrary mixed color can be expressed by simultaneously causing the light emitting elements of R, G, and B colors to emit light by the display device of this embodiment.

It is a principle figure in embodiment of the light emitting element of this invention. It is a schematic perspective view which shows an example of the organic electroluminescence display in this invention. It is a plane schematic diagram of 1 pixel in Example 1 of the light emitting element of the present invention. FIG. 4 is a cross-sectional view taken along line A-A ′, line B-B ′, and line C-C ′ of FIG. 3. It is a schematic diagram of the equivalent circuit in Example 1 of the light emitting element of the present invention. 2 shows a driving method of the organic EL display device according to the first embodiment. It is a plane schematic diagram of 1 pixel in Example 2 of the light emitting element of the present invention. It is sectional drawing cut | disconnected along the A-A 'line | wire and B-B' line | wire of FIG. It is the schematic diagram of the equivalent circuit in Example 2 of the light emitting element of this invention. It is a plane schematic diagram of 1 pixel in Example 3 of the light emitting element of the present invention. It is sectional drawing cut | disconnected along the A-A 'line | wire and B-B' line | wire of FIG. It is a schematic diagram of the equivalent circuit in Example 3 of the light emitting element of the present invention.

Explanation of symbols

P pixel P1 first subpixel P2 second subpixel 1 substrate 2,21 first electrode 3,22 second electrode 4,24,42 intermediate electrode 5,5a, 5b, 36,43a, 43b, 64 upper electrode 6, 63 Third electrode 10 Power source 11 First light emitting element 12 Second light emitting element 13 Third light emitting element 20, 20a, 20b, 20c Contact hole 23, 23a, 23b Connection electrode 25, 25a, 25b, 25c Contact hole 26, 26a, 26b, 26c, 26d Contact hole 27 Opening of partition wall (display area region)
31a, 31b, 31c TFT pixel circuit 32 Partition 33 First organic light emitting layer 34 Second organic light emitting layer 35 Third organic light emitting layer 101a, 101b Switching TFT
102a, 102b Driving TFT
103a, 103b Capacitor 105 Gate signal line 106a, 106b Source signal line 107 Power supply line 108 Electrode wiring

Claims (14)

The pixel includes at least one pixel, and the pixel includes at least two subpixels including a first subpixel and a second subpixel, and the subpixel sandwiches at least an organic layer including a light emitting layer with an electrode. In an organic EL display device configured to emit light from the light emitting layer by applying a voltage between the electrodes of the light emitting element,
2. An organic EL display device, wherein the number of light emitting elements stacked on the first subpixel and the second subpixel is different from each other.   2. The light emitting device according to claim 1, wherein two light emitting devices are sequentially stacked on the substrate in the first subpixel, and one light emitting device is formed on the substrate in the second subpixel. The organic EL display device described in 1.   In the first subpixel, a first light emitting element and a second light emitting element are sequentially stacked, and the first light emitting element has a first electrode, a first organic light emitting layer, and an intermediate electrode sequentially stacked on the substrate. The second light emitting device has a structure in which a second organic light emitting layer and an upper electrode are sequentially stacked on the intermediate electrode, and the second subpixel has a third light emitting device on the substrate. The said 3rd light emitting element is a structure by which the 2nd electrode, the 3rd organic light emitting layer, and the said upper electrode were laminated | stacked in order on the said board | substrate. Organic EL display device.   The organic EL display device is a top emission type, wherein the first electrode and the second electrode have reflectivity, and the intermediate electrode and the upper electrode have translucency. The organic EL display device described.   The organic EL display device according to claim 3, wherein the first electrode and the upper electrode are electrically connected.   In the first subpixel, a first light emitting element and a second light emitting element are sequentially stacked, and the first light emitting element has a first electrode, a first organic light emitting layer, and an intermediate electrode sequentially stacked on a substrate. The second light emitting device has a structure in which the intermediate electrode, the second organic light emitting layer, and the first upper electrode are sequentially stacked, and the second subpixel has a third light emitting on the substrate. The organic light emitting device according to claim 2, wherein an element is formed, and the third light emitting element has a configuration in which the first electrode, the third organic light emitting layer, and the second upper electrode are sequentially stacked. EL display device.   The organic EL display device is a top emission type, wherein the first electrode has reflectivity, and the intermediate electrode, the first upper electrode, and the second upper electrode have translucency. Item 7. The organic EL display device according to Item 6.   The organic EL display device according to claim 6, wherein the first electrode and the first upper electrode are electrically connected.   In the first subpixel, a first light emitting element and a second light emitting element are sequentially stacked, and the first light emitting element has a first electrode, a first organic light emitting layer, and a third electrode sequentially on the substrate. The second light-emitting element has a configuration in which a second organic light-emitting layer and an upper electrode are sequentially stacked on the third electrode, and the second sub-pixel is formed on the substrate. Three light-emitting elements are formed, and the third light-emitting element has a configuration in which a second electrode, a third organic light-emitting layer, and the third electrode are sequentially stacked on the substrate. Item 3. An organic EL display device according to Item 2.   The organic EL display device is a top emission type, wherein the first electrode and the second electrode have reflectivity, and the third electrode and the upper electrode have translucency. The organic EL display device described in 1.   The organic EL display device according to claim 9, wherein the first electrode and the upper electrode are electrically connected.   10. The organic EL display according to claim 3, wherein light emission colors from the first light emitting element, the second light emitting element, and the third light emitting element are different from each other. 11. apparatus.   The organic EL display device according to claim 1, wherein the light emitting elements of the first subpixel and the second subpixel are controlled to emit light in a time-sharing manner.   The organic EL display device according to claim 1, wherein the light emitting elements of the first subpixel and the second subpixel are controlled to emit light simultaneously.

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