JP2006294448A - Organic el device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL device and an electronic apparatus which can display an image high in qualities like color balance even when receiving incident outer light. <P>SOLUTION: An organic EL device 100 at least comprises a light emission layer 13 placed between a pair of electrodes and a circularly polarizing plate 30 placed on a display surface, where reflection spectrum of the circularly polarizing plate 30 is set on the basis of light which the outer light forces the light emission layer 13 to emit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an organic EL device and an electronic apparatus.

  As a next-generation display device, an organic electroluminescence device (organic EL device) is expected. An organic EL device is configured by disposing an organic EL element having a light emitting layer sandwiched between upper and lower electrodes on a base, typically on a translucent substrate such as glass, an anode, A structure in which an organic functional layer (a hole transport layer, a light emitting layer, an electron transport layer, or the like) and a cathode are sequentially stacked is employed. The light emitting layer of the organic functional layer is caused to emit light by supplying current to the organic functional layer through the anode and the cathode.

  Organic EL devices are mainly classified into a top emission system that extracts light from the cathode side and a bottom emission system that extracts light from the anode side. Among them, in a bottom emission type organic EL device, an anode is generally formed of a transparent conductive material such as ITO, and a cathode is formed of a metal material such as Al. The light from the light emitting layer is reflected by the cathode and emitted from the anode to display an image.

In the bottom emission type organic EL device, when external light such as sunlight enters from the anode, the external light is reflected by the cathode, so that the display becomes difficult to visually recognize. In order to solve this problem, a technique has been proposed in which a circularly polarizing plate is disposed outside a glass substrate in an organic EL device (see, for example, Patent Documents 1 to 4). The circularly polarizing plate is configured by sequentially laminating a retardation film and a polarizing film from the anode side. External light incident on this circularly polarizing plate is first converted into linearly polarized light along the transmission axis of the polarizing film, and further converted into circularly polarized light by the retardation film. When the circularly polarized light enters the organic EL element from the anode and is reflected by the cathode, the circularly polarized light is converted into circularly polarized light whose rotation direction is reversed. The circularly polarized light is absorbed by the polarizing film because it is converted into linearly polarized light orthogonal to the transmission axis of the polarizing film when retransmitting the retardation film. In this way, external light is absorbed by the circularly polarizing plate to ensure the visibility of the display of the organic EL device.
Japanese Patent Laid-Open No. 8-322138 Japanese Patent Laid-Open No. 9-127858 Japanese Patent Laid-Open No. 2001-76865 JP 2002-311239 A

  However, when external light such as sunlight enters the organic EL device, not only is reflection inside the organic EL device, but also the light emitting layer emits light of a specific color due to the incident light. is there. For example, when blue light transmitted through a circularly polarizing plate in sunlight enters a light emitting layer of a red light emitting material, the light emitting layer may be excited by a photoluminescence (PL) effect to emit red light. Therefore, when sunlight or the like enters the organic EL device, the black display portion (non-display portion) may be displayed in red and black, which may deteriorate the display quality of the color image.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an organic EL device and an electronic apparatus that can display a high-quality image with good color balance even when external light is incident.
In addition, the present invention provides an organic EL device and an electronic apparatus that can alleviate coloring of display light due to external light, and can display images with higher image quality and better color balance than in the past even when used outdoors. With the goal.

In order to achieve the above object, the organic EL device of the present invention is an organic EL device comprising at least a light emitting layer disposed between a pair of electrodes and a circularly polarizing plate disposed on a display surface, The reflection spectral characteristic of the circularly polarizing plate is set based on the spectral characteristic of light emission when the light emitting layer emits light by external light.
According to the organic EL device of the present invention, the colored light emission when the light emitting layer emits light by external light can be mitigated by the reflected light of the circularly polarizing plate. For example, when the light emitting layer is excited by external light and emits red light, if the reflected light of the circularly polarizing plate is blue, the red and blue are combined to produce a gray display. it can. Therefore, even when the organic EL device is used outdoors or the like, it is possible to prevent the non-light emitting portion in the display area from developing red or the like. Therefore, the present invention can provide an organic EL device capable of high-quality display with good color balance even when used outdoors.

In order to achieve the above object, the organic EL device of the present invention is an organic EL device comprising at least a light emitting layer disposed between a pair of electrodes and a circularly polarizing plate disposed on a display surface, The circularly polarizing plate has a reflection spectral characteristic of chromaticity that is complementary to the chromaticity of the emitted light when the light emitting layer emits light by the transmitted light that is transmitted through the circularly polarizing plate. It is characterized by having.
According to the organic EL device of the present invention, when sunlight (white light) is transmitted through the circularly polarizing plate and the light emitting layer is excited by the transmitted light, the color of the light emitted from the circularly polarizing plate is changed. It can be canceled out by reflected light. For example, when the light transmitted through the circularly polarizing plate is blue, the red light emitting layer may be excited by the photoluminescence (PL) effect to emit red light. In this case, the reflected light of the circularly polarizing plate is blue which is a complementary color of red. Therefore, the light emitted from the light emitting layer and the reflected light of the circularly polarizing plate are combined to display gray. Therefore, the present invention can provide an organic EL device capable of high-quality display with good color balance even when used in an environment where white light such as sunlight is incident on the display screen.

In the organic EL device of the present invention, it is preferable that a peak wavelength of reflection spectral characteristics of the circularly polarizing plate is shorter than a peak wavelength of the light emission.
In the organic EL device of the present invention, it is preferable that the circularly polarizing plate has blue reflected light with respect to sunlight (white light).
According to the present invention, for example, when the peak wavelength of light emitted from the light emitting layer by external light is a red wavelength, the peak wavelength of the reflected light of the circularly polarizing plate is shorter than red (blue which is a complementary color of red) and Become. Thereby, this invention can provide simply the organic electroluminescent apparatus which can perform a display with a sufficient color balance.

In the organic EL device of the present invention, the peak wavelength of the reflection spectral characteristic of the circularly polarizing plate is λA [nm], and the peak wavelength of the spectral characteristic of the light emission when the light emitting layer emits light by external light is λB [ nm] is preferably in the range of (550 × 2-λB) ± 50 [nm].
According to the present invention, the peak wavelength λA of the reflection spectral characteristics of the circularly polarizing plate and the peak wavelength λB of light emission by external light can be made into a target relationship centering on 550 nm, which is the maximum wavelength in human visual sensitivity. . Therefore, according to the present invention, the color of the reflected light of the circularly polarizing plate and the color of light emitted by the external light can be more accurately and simply set to a complementary color relationship.

In the organic EL device of the present invention, it is preferable that the circularly polarizing plate has a function not to transmit ultraviolet rays.
According to the present invention, there is a case where light in a specific wavelength region is incident on the light emitting layer due to the ultraviolet cut function of the circularly polarizing plate, and a specific color is emitted from the light emitting layer. Even in such a case, the present invention can relieve the specific color with the reflected light of the circularly polarizing plate. Therefore, the present invention can easily provide an organic EL device capable of displaying with good color balance.

In the organic EL device of the present invention, the circularly polarizing plate is preferably composed of a polarizing plate and a retardation plate.
According to the present invention, external light incident on the circularly polarizing plate can be converted into linearly polarized light by the polarizing plate. The linearly polarized light can be converted into circularly polarized light by a phase difference plate (λ / 4 plate). When the circularly polarized light is reflected by the cathode of the organic EL device, the circularly polarized light is converted into circularly polarized light whose rotation direction is reversed. The reflected light (circularly polarized light) is converted into linearly polarized light when it passes through the phase difference plate again. This linearly polarized light is linearly polarized light that is orthogonal to the transmission axis of the polarizing plate, so that it is completely transmitted through the polarizing plate. Can not. Therefore, according to the said circularly-polarizing plate, it can prevent that the reflected light produced by the external light which injected into the organic EL apparatus goes out of the organic EL apparatus. In addition, the color of light emitted by the external light incident on the organic EL device can be canceled by the reflected light of the circularly polarizing plate. Accordingly, the present invention can provide an organic EL device capable of high-quality display with good color balance even when used outdoors.

In the organic EL device of the present invention, the light emitting layer is disposed between a pair of electrodes, the electrode on the display surface side of the pair of electrodes is transparent, and the other electrode has a high reflectance. The light emitting layer includes a red light emitting layer that emits red light, a green light emitting layer that emits green light, and a blue light emitting layer that emits blue light when current is supplied to the light emitting layer by the pair of electrodes. It is preferable to have.
According to the present invention, for example, when external light is transmitted through a circularly polarizing plate and the red light emitting layer is excited by the transmitted light to emit red light, the reflected light (blue) of the circularly polarizing plate emits red light. Can be countered. Therefore, the present invention can provide an organic EL device capable of high-quality display with good color balance even when used outdoors.

In order to achieve the above object, an electronic apparatus according to the present invention includes the organic EL device.
According to the electronic apparatus of the present invention, it is possible to display a high quality image with a good color balance even when used outdoors.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing referred to below, the dimensions and the like of each component are appropriately changed and displayed for easy understanding of the drawing.

(First embodiment)
FIG. 1 is a cross-sectional configuration diagram of an organic EL device according to a first embodiment of the present invention. As shown in FIG. 1, the organic EL device 100 of the present embodiment is a bottom emission type organic EL device that extracts output light from the organic EL element 110 from the anode 11 side.

(Basic configuration of organic EL device)
The organic EL device 100 has a configuration in which an organic EL element 110 is disposed on the upper surface of a substrate 10. The organic EL element 110 includes an anode 11 made of a transparent conductive film such as ITO (indium tin oxide), a hole transport layer 12, and a light emitting layer 13 on one side (upper surface in FIG. 1) of the glass substrate 10. The electron transport layer 14 and the cathode 21 made of a light reflective metal film such as Al are sequentially laminated. The hole transport layer 12, the light emitting layer 13, and the electron transport layer 14 form an organic functional layer 15 made of an organic functional material. Further, as will be described in detail later, a retardation film (retardation plate) 31 and a polarizing film (polarizing plate) 32 are sequentially laminated on the other surface (the lower surface in FIG. 1) side of the glass substrate 10 to obtain circularly polarized light. A plate 30 is configured.

The anode 11 is typically made of ITO, but is not limited to this, and a known light-transmitting conductive material can be used.
For the cathode 21, Al (aluminum) having good light reflectivity can be suitably used. In this case, the cathode 21 has a function of reflecting light generated in the light emitting layer 13 to the anode 11 side. In addition to Al, Au (gold), Ag (silver), Cr (chromium), Cu (copper), Ni (nickel), Ca, Mg (magnesium), Sr, Yb (ytterbium), Er (erbium) ), Tb (terbium), Sm (samarium), and the like, and a structure in which a plurality of thin films of metal materials selected from these are stacked.

  The light emitting material that can constitute the light emitting layer 13 is a known polymer light emitting material capable of emitting fluorescence or phosphorescence, such as polyfluorene derivative (PF), polyparaphenylene vinylene derivative (PPV), polyphenylene derivative ( PP), polyparaphenylene derivative (PPP), polyvinylcarbazole (PVK), polythiophene derivative, polydialkylfluorene (PDAF), polyfluorenebenzothiadiazole (PFBT), polyalkylthiophene (PAT), polymethylphenylsilane (PMPS) Such as polysilanes can be suitably used. In addition, these light-emitting materials include polymer materials such as perylene dyes, coumarin dyes, rhodamine dyes, rubrene, perylene, 9,10-diphenylanthracene, tetraphenylbutadiene, Nile red, coumarin 6, quinacridone, and the like. It is also possible to use a low molecular weight material doped.

The hole transport layer 12 enhances the efficiency of charge injection from the anode 11 to the light emitting layer 13 and also has a function of blocking electrons moving in the light emitting layer 13, so that electrons and holes in the light emitting layer are regenerated. There is an effect of increasing the coupling probability. For the hole transport layer 12, a material having a low injection barrier from the anode 11 and a high hole mobility is preferably used. As such a material, for example, a polythiophene derivative, a polypyrrole derivative, or a doped body thereof is used. Specifically, a dispersion of 3,4-polyethylenedioxythiophene / polystyrene sulfonic acid (PEDOT / PSS) [trade name; Bytron-p: manufactured by Bayer], that is, polystyrene as a dispersion medium A dispersion liquid in which 3,4-polyethylenedioxythiophene is dispersed in sulfonic acid and then dispersed in water is used.
If necessary, the electron transport layer 14 having a hole blocking function may be formed while increasing the efficiency of electron injection from the cathode 21 to the light emitting layer 13. The electron transport layer 14 can be formed of an organic material such as an oxadiazole derivative or Alq ₃ .

In the organic EL device 100 of the present embodiment having the above-described configuration, light is applied in the light emitting layer 13 according to the amount of current flowing through the organic functional layer 15 by applying a predetermined voltage between the anode 11 and the cathode 21. appear. The generated light is extracted directly from the anode 11 and the light reflected by the cathode 21 is indirectly extracted from the glass substrate 10 side.
Note that the light emitting layer 13 can emit light of different colors by appropriately selecting the material of the light emitting layer 13. Therefore, the organic EL device 100 of the present embodiment has a configuration in which a plurality of organic EL elements 110 that emit light in any of the three primary colors of RGB are arranged in a matrix.

(Circularly polarizing plate)
In FIG. 1, a circularly polarizing plate 30 is disposed on the light emitting surface side of the glass substrate 10. The circularly polarizing plate 30 includes a retardation film (retarding plate) 31 disposed on the glass substrate 10 side and a polarizing film (polarizing plate) 32 disposed on the outside thereof. This polarizing film 32 transmits only the linearly polarized light in the transmission axis direction of the external light incident on the organic EL device 100 from the outside of the glass substrate 10 (the lower side in FIG. 1). The polarizing film 32 is, for example, mounted on a surface of a support substrate made of triacetyl cellulose (TAC) or the like with a film of polyvinyl alcohol (PVA) or the like adsorbed with iodine complex or the like, and stretched in a predetermined direction. It is formed by orienting PVA polymer and iodine complex.

  The retardation film 31 has a so-called birefringence in which the refractive index in the fast axis direction is smaller than the refractive index in the slow axis direction. The retardation film 31 is formed by mounting a film such as polycarbonate on the surface of a support substrate made of triacetylcellulose (TAC) or the like, and stretching the film in a predetermined direction to orient the polycarbonate molecules.

  2 is an explanatory view of the arrangement of the polarizing film 32 and the retardation film 31, and is a bottom view of FIG. As shown in FIG. 2, the slow axis 31 a of the retardation film 31 is arranged to form 45 degrees with the transmission axis 32 a of the polarizing film 32. Thereby, the linearly polarized light transmitted through the polarizing film 32 is converted into elliptically polarized light. Further, the thickness of the retardation film 31 is set so that the retardation of the retardation film 31 is about λ / 4, where λ is the wavelength of light incident on the retardation film 31. That is, a so-called λ / 4 plate is employed as the retardation film 31. And the circularly-polarizing plate 30 which converts incident light into circularly polarized light is comprised by the polarizing film 32 mentioned above and the phase difference film 31 which is (lambda) / 4 board. In addition, it is also possible to comprise a circularly polarizing plate by using a retardation film in which a λ / 4 plate and a λ / 2 plate are combined.

  Then, light incident on the organic EL device 100 from the outside of the glass substrate 10 shown in FIG. 1 (lower side in FIG. 1) is converted into linearly polarized light perpendicular to the paper surface by the polarizing film 32, for example. The linearly polarized light is converted into, for example, counterclockwise circularly polarized light by the retardation film 31, passes through the glass substrate 10, and enters the organic EL element 110. When this counterclockwise circularly polarized light is reflected by the cathode 21 which is a metal electrode, the rotational direction is reversed with respect to the traveling direction, and becomes clockwise circularly polarized light. When the clockwise circularly polarized light is transmitted again through the retardation film 31, it is converted into linearly polarized light parallel to the paper surface. This linearly polarized light is absorbed by the polarizing film 32 having a transmission axis perpendicular to the paper surface. As described above, in the organic EL device 100 of the present embodiment, even when used in an environment where external light such as sunlight is incident on the panel, the external light reflected by the light-reflective cathode 21 is used as the polarizing film 32. So that it does not reach the observer.

  FIG. 3 is a diagram illustrating spectral characteristics of light emission generated in the black display portion of the organic EL device 100 when the organic EL device 100 is irradiated with sunlight. Here, the black display portion is a portion where all of the light emitting layers 13 related to the red pixel, the green pixel, and the blue pixel are not emitting light in the display region of the organic EL device 100. In FIG. 3, the horizontal axis indicates the wavelength, and the vertical axis indicates the emission intensity. As shown in FIG. 3, it can be seen that the light emitted from the black display portion is reddish. This is because the light emitting layer 13 is photoexcited by external light and emits light.

  FIG. 4 is a diagram showing the spectral characteristics of the absorbance of the light emitting layer 13. In FIG. 4, the horizontal axis indicates the wavelength, and the vertical axis indicates the absorbance. As shown in FIG. 4, the light emitting layer 13 has a light absorbing action even in the order of 360 nm to 500 nm (blue) in the visible light wavelength range (360 nm to 780 nm). Due to the blue color, the light emitting layer 13 emits red light as shown in FIG. This light emission is due to the photoluminescence (PL) effect in the light emitting layer 13 and is due to an effect different from the electroluminescence (EL) effect that emits light by supplying a current to the light emitting layer 13 through the electrode.

  FIG. 5 is a diagram showing the transmission spectrum characteristics of the circularly polarizing plate 30. In FIG. 5, the horizontal axis indicates the wavelength, and the vertical axis indicates the transmittance. Thus, the circularly polarizing plate 30 does not transmit light having a wavelength of about 400 nm or less and has an ultraviolet cut function.

  However, as shown in FIG. 4, the light-emitting layer 13 has a light-absorbing action even for blue light with a wavelength of 400 nm or more, and therefore emits red light due to the PL effect. This red color is generated in the black display portion, and is a color that gives an impression different from that of black, which is the original display color, and hinders display quality.

  Therefore, in the present embodiment, the reflection spectral characteristics of the circularly polarizing plate 30 are set based on the spectral characteristics of light emission when the light emitting layer 13 emits light by external light. That is, the circularly polarizing plate 30 has a reflection spectral characteristic of chromaticity (blue) that is complementary to the red color in order to alleviate or cancel the red light emission (coloring) emitted from the external light by the light emitting layer 13. It is said. Furthermore, in other words, the circularly polarizing plate 30 of the present embodiment is not only for the function of not reflecting the reflected light inside the organic EL device 100 to the outside of the organic EL device 100 as described above, but also for irradiation with sunlight or the like. On the other hand, it has a function of reflecting blue light.

  FIG. 6 is a diagram showing a reflection spectrum of the circularly polarizing plate 30. In FIG. 6, the horizontal axis indicates the wavelength, and the vertical axis indicates the reflection intensity. The reflection chromaticity (x, y) of the circularly polarizing plate 30 is (0.1615, 0.1477), which is so-called blue. Note that the reflection spectral spectrum of the circularly polarizing plate 30 shown in FIG. 6 is an example of the present embodiment, and it is sufficient that it is at least bluish.

  As a result, according to the organic EL device 100 of the present embodiment, the emission color of the light emitting layer 13 by the external light and the color of the reflected light of the circularly polarizing plate 30 are in a complementary color relationship, so that a normal environment where external light exists When used underneath, high-quality display with a color balance without coloring due to external light can be achieved.

  The circularly polarizing plate 30 that performs such complementary color reflection can be constituted by, for example, the following polarizing film 32 and retardation film 31. As the polarizing film 32, SEG1425Du made by Nitto Denko can be adopted. Then, by arranging the retardation film 31 made of polycarbonate so as to form an angle of 45 degrees with the absorption axis 31a of the polarizing film 32, the circularly polarizing plate 30 reflecting the complementary color can be realized. Polycarbonate has a chromatic dispersion which is a ratio of the phase difference (R450 / R590) for transmitted light of 450 nm and 590 nm, and the phase difference of R590 = 165 nm when transmitted light of 590 nm. Further, in the present embodiment, one retardation film 31 is used to configure the circularly polarizing plate 30, but the circularly polarizing plate 30 may be configured using a plurality of retardation films 31.

  In this embodiment, the peak wavelength (λB) of the emission spectrum of the organic EL device 100 due to external light is about 650 nm as shown in FIG. On the other hand, the peak wavelength (λA) of the reflection spectrum of the circularly polarizing plate 30 is about 435 nm as shown in FIG. These are generally in a relationship of λA = (550 × 2−λB). If it does in this way, coloring of the organic electroluminescent apparatus at the time of the non-drive by the sunlight in external light especially can be relieved. Note that the relationship between λA and λB does not require that the above mathematical formula is strictly established. For example, the value of λA or λB exhibits the effect of the present embodiment within a range of ± 50 [nm]. Can do.

(Second Embodiment)
FIG. 7 is a schematic cross-sectional view of an organic EL device according to the second embodiment of the present invention. In FIG. 7, the same components as those in FIG. 1 are denoted by the same reference numerals. The organic EL device 200 of this embodiment has a plurality of RGB dots. The R dot is a portion of the light emitting layer 13R that emits red light. The G dot is a portion of the light emitting layer 13G that emits green light. The B dot is a portion of the light emitting layer 13B that emits blue light.

  FIG. 8 is a diagram illustrating spectral characteristics of light emission generated in the black display portion of the organic EL device 200 when the organic EL device 200 is irradiated with sunlight. In FIG. 8, the horizontal axis indicates the wavelength and the vertical axis indicates the emission intensity. As shown in FIG. 8, it can be seen that the light emitted from the black display portion is reddish. This is because the light emitting layer 13R of R (red) dots is photoexcited by external light and emits light.

  FIG. 9 is a diagram showing the spectral characteristics of the absorbance of each of the light emitting layers 13R, 13G, and 13B. In FIG. 9, the horizontal axis indicates the wavelength, and the vertical axis indicates the absorbance. The curve R is the absorbance spectrum characteristic of the light emitting layer 13R, the curve G is the absorbance spectrum characteristic of the light emitting layer 13G, and the curve B is the absorbance spectrum characteristic of the light emitting layer 13B. It can be seen that the red dot light emitting layer 13R also absorbs light in the visible light wavelength range (blue). The PL effect is caused by the light absorption of the light emitting layer 13R, and red light is emitted from the light emitting layer 13R.

  The circularly polarizing plate 30 which is a constituent element of the organic EL device 200 has an ultraviolet cut function as described in the first embodiment, and cuts off external light of 400 nm or less. However, as shown in FIG. 9, the light emitting layer 13R has light absorption characteristics even for light of 400 nm or more, and therefore the light emitting layer 13R emits light due to external light.

  Therefore, in the present embodiment, the reflection spectral characteristics of the circularly polarizing plate 30 are set based on the spectral characteristics of light emission when the light emitting layer 13R emits light by external light. In other words, the circularly polarizing plate 30 has a chromaticity (blue) reflection spectral characteristic that is complementary to the red color so that the light emitting layer 13R relaxes or cancels red light emitted by external light.

  FIG. 10 is a reflection spectrum of the circularly polarizing plate 30. In FIG. 10, the horizontal axis indicates the wavelength, and the vertical axis indicates the reflection intensity. The reflection chromaticity (x, y) of the circularly polarizing plate 30 is (0.1615, 0.1477), which is so-called blue. Note that the reflection spectral spectrum of the circularly polarizing plate 30 shown in FIG. 10 is an example of the present embodiment, and it is sufficient that it is at least bluish. The specific configuration and material of the circularly polarizing plate 30 can be the same as those of the circularly polarizing plate 30 of the first embodiment.

  As a result, according to the organic EL device 200 of the present embodiment, the emission color of the light emitting layer 13R by the external light and the color of the reflected light of the circularly polarizing plate 30 are in a complementary color relationship. When used underneath, high-quality display with a color balance without coloring due to external light can be achieved. On the other hand, the conventional organic EL display device can absorb the “reflected light” inside the organic EL device almost completely by the circularly polarizing plate, but it is generated when the light emitting layer is excited by external light. It cannot absorb "luminescence". Here, when only the light emitting layer of a specific color (for example, red) emits light, the display area of the non-driven portion of the organic EL device is colored. However, the organic EL device 200 of the present embodiment can relax the color emitted by external light with the color reflected by the circularly polarizing plate 30. Therefore, the organic EL device 200 of the present embodiment can display a high quality image with a better color balance than the conventional organic EL device.

(Electronics)
FIG. 11 is a perspective configuration diagram illustrating an example of an electronic apparatus including the organic EL devices 100 and 200 according to the above embodiments. A cellular phone 1300 shown in the figure includes a plurality of operation buttons 1302, an earpiece 1303, a mouthpiece 1304, and a display unit 1301 including the organic EL devices 100 and 200 of the previous embodiment. Yes. According to the cellular phone 1300, high-quality display can be performed by the organic EL devices 100 and 200 provided in the display unit even when used outdoors.

  In addition, the electronic apparatus provided with the organic EL device according to the present invention is not limited to the above-mentioned ones. For example, digital cameras, personal computers, televisions, portable televisions, viewfinder type / monitor direct-view type video tape recorders. PDAs, portable game machines, pagers, electronic notebooks, calculators, clocks, word processors, workstations, videophones, POS terminals, devices with touch panels, and the like. In addition, examples of the electronic device including the organic EL device according to the present invention include a vehicle-mounted display such as a vehicle-mounted audio device, a vehicle instrument, and a car navigation device.

  The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, such as the specific circuit configuration described in the embodiment. Is just an example and can be changed as appropriate.

For example, in the above-described embodiment, the bottom emission type organic EL device has been described as an example. However, the present invention can be applied to a top emission type organic EL device. In the top emission type organic EL device, the anode is made of a metal material such as Al, and the cathode is made of a transparent conductive material such as ITO. The light from the light emitting layer is reflected by the anode and emitted from the cathode. Therefore, a circularly polarizing plate may be disposed outside the sealing substrate that hermetically seals the entire organic EL element, and the circularly polarizing plate may be configured in the same manner as in this embodiment.
In addition, the present invention can be applied to all organic EL devices in which a circularly polarizing plate is disposed on the display surface side.

It is a section lineblock diagram of an organic EL device concerning a 1st embodiment. It is explanatory drawing of arrangement | positioning of a polarizing film and retardation film. It is a figure which shows the spectral characteristic of light emission which a organic EL device produced | generated by external light. It is a figure which shows the spectral characteristic of the light absorbency of a light emitting layer. It is a figure which shows the transmission spectrum characteristic of a circularly-polarizing plate. It is a figure which shows the reflection spectroscopy spectrum of a circularly-polarizing plate. It is a schematic cross section of the organic EL device according to the second embodiment. It is a figure which shows the spectral characteristic of light emission which a organic EL device produced | generated by external light. It is a figure which shows the light absorption spectrum characteristic of each light emitting layer of RGB. It is a figure which shows the reflection spectroscopy spectrum of a circularly-polarizing plate. It is a perspective view of an example of the electronic device concerning an embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Glass substrate, 11 ... Anode, 12 ... Hole transport layer, 13, 13B, 13G, 13R ... Light emitting layer, 14 ... Electron transport layer, 15 ... Organic functional layer, 21 ... Cathode, 30 ... Circularly polarizing plate, 31 ... retardation film (retardation plate), 32 ... polarizing film (polarizing plate), 100, 200 ... organic EL device, 110 ... organic EL element

Claims (9)

An organic EL device comprising at least a light emitting layer disposed between a pair of electrodes and a circularly polarizing plate disposed on a display surface,
The organic EL device according to claim 1, wherein the reflection spectral characteristic of the circularly polarizing plate is set based on a spectral characteristic of light emission when the light emitting layer emits light by external light. An organic EL device comprising at least a light emitting layer disposed between a pair of electrodes and a circularly polarizing plate disposed on a display surface,
The circularly polarizing plate is a reflection spectral characteristic of chromaticity that is complementary to the chromaticity of the emitted light when the light emitting layer emits light by the transmitted light that is transmitted through the circularly polarizing plate. An organic EL device comprising:   The organic EL device according to claim 1, wherein a peak wavelength of reflection spectral characteristics of the circularly polarizing plate is shorter than a peak wavelength of the light emission.   The organic EL device according to any one of claims 1 to 3, wherein the circularly polarizing plate has blue reflected light with respect to sunlight. When the peak wavelength of the reflection spectral characteristic of the circularly polarizing plate is λA [nm], and the peak wavelength of the spectral characteristic of the light emission when the light emitting layer emits light by external light is λB [nm]
5. The organic EL device according to claim 1, wherein λA is in a range of (550 × 2−λB) ± 50 [nm].   The organic EL device according to any one of claims 1 to 5, wherein the circularly polarizing plate has a function of not transmitting ultraviolet light.   The organic EL device according to claim 1, wherein the circularly polarizing plate includes a polarizing plate and a retardation plate. The light emitting layer is disposed between a pair of electrodes,
The electrode on the display surface side of the pair of electrodes is transparent, and the other electrode has high reflectivity,
The light emitting layer has a red light emitting layer that emits red light, a green light emitting layer that emits green light, and a blue light emitting layer that emits blue light when current is supplied to the light emitting layer by the pair of electrodes. The organic EL device according to claim 1, wherein the organic EL device is formed. An electronic apparatus comprising the organic EL device according to claim 1.

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