JP2011108821A - Organic el display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL display device which can efficiently convert light propagating in the interior of a transparent substrate through repeated total reflection into electricity with a photovoltaic generation element. <P>SOLUTION: An organic EL display device 10 includes an organic EL element 20 having a substrate 21 for organic EL element and an organic EL layer 22 provided in a plane 21a of one side of the substrate 21 for organic EL element, and a substrate 31 for color filter located in an observation side while being provided in the organic EL layer 22 side of the organic EL element 20. Moreover, in a non-display region 33 of the substrate 31 for color filter, a light-collecting portion 34 which collects the light propagating in the interior of the substrate 31 for color filter through repeated total reflection, and a photovoltaic generation element 35 which generates electricity by the light from the light-collecting portion 34 are provided. Further, in other than the region where the light-collecting portion 34 and the photovoltaic generation element 35 are provided in the non-display region 33, a reflection material 36 which guides the light to the light-collecting portion 34 by reflecting the light is provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an organic EL display device including a transparent substrate positioned on an observation side, and in particular, generates power by a light collecting unit that collects light in a non-display region of the transparent substrate and light from the light collecting unit. The present invention relates to an organic EL display device including a photovoltaic element.

  2. Description of the Related Art Conventionally, display devices that use light emitted from light emitting elements as display light have been developed, and organic EL (electroluminescence) elements are known as light emitting elements used in such display devices. In general, an organic EL element has an organic EL element substrate and an organic EL layer provided on one surface of the organic EL element substrate. In this case, a display device (organic EL display device) The organic EL element is formed by combining a transparent substrate provided on the organic EL layer side of the organic EL element and positioned on the observation side.

  In the organic EL display device described above, generally, only about 20% of the light emitted from the organic light emitting layer of the organic EL layer is extracted from the transparent substrate to the observation side, and the remaining 80% is the organic EL display device. It is known that total internal reflection is propagated repeatedly, and then attenuates and disappears during propagation. For this reason, the organic EL display device has a problem that light extraction efficiency is low and power consumption is large.

  In order to solve such a problem, for example, Patent Document 1 proposes an organic EL display device that can convert light propagating through the transparent substrate into electricity by providing a photovoltaic element on the side surface of the transparent substrate. Has been. In this case, the electricity generated in the photovoltaic element can be used as power for driving the organic light emitting layer, thereby reducing the power consumption of the organic EL display device. Patent Document 2 proposes an organic EL display device in which a photovoltaic element is provided between an organic EL layer and an organic EL element substrate.

JP 2005-44732 A JP 2009-76393 A

  However, in the organic EL display device described in Patent Document 1, no effort has been made to guide the light propagating through the transparent substrate to the photovoltaic element. It is thought that electricity cannot be generated efficiently. Further, in the organic EL display device described in Patent Document 2, the photovoltaic element is provided between the organic EL layer and the organic EL element substrate, and is thus emitted from the organic EL layer toward the observation side. Light that is light and propagates inside the transparent substrate cannot be converted into electricity.

  The present invention has been made in consideration of such points, and an object thereof is to provide an organic EL display device capable of efficiently converting light propagating through a transparent substrate into electricity by a photovoltaic device. To do.

  A first organic EL display device according to the present invention includes an organic EL element having an organic EL element substrate, an organic EL layer provided on one surface of the organic EL element substrate, and an organic EL element organic material. A transparent substrate provided on the EL layer side and positioned on the observation side, the organic EL layer has an anode, a cathode, and an organic light emitting layer provided between the anode and the cathode, and the transparent substrate is The organic EL layer is divided into a display area where light from the organic light emitting layer is emitted toward the observation side, and a non-display area where light from the organic light emitting layer of the organic EL layer is not emitted toward the observation side. A condensing part for condensing light and a photovoltaic element for generating electricity by the light from the condensing part provided in the non-display area of the transparent substrate, and the condensing part and the photovoltaic element in the non-display area of the transparent substrate The light collecting part reflects the light from the organic light emitting layer to a region other than the region where An organic EL display device characterized by having a reflective material to direct.

  In the first organic EL display device according to the present invention, the transparent substrate may be a color filter substrate, and a color filter layer may be provided in a display region of the color filter substrate.

  In the first organic EL display device according to the present invention, a sealing material is provided between the organic EL element substrate and the transparent substrate, and the sealing material between the organic EL element substrate and the transparent substrate. A storage space for storing the organic EL layer may be formed.

  In the first organic EL display device according to the present invention, the condensing part may be composed of a scratch part or a lens part formed on the surface of the transparent substrate.

  A second organic EL display device according to the present invention includes a transparent substrate having one surface located on the observation side and the other surface, an organic EL element provided on the other surface of the transparent substrate, The organic EL element includes an organic EL element substrate, and an organic EL layer provided between the organic EL element substrate and the transparent substrate. The organic EL layer includes an anode, a cathode, The organic light emitting layer provided between the anode and the cathode, and the transparent substrate includes a display region in which light from the organic light emitting layer of the organic EL layer is emitted toward the observation side, and an organic layer of the organic EL layer. A non-display area in which light from the light emitting layer is not emitted toward the observation side, and a light collecting section that collects light on the non-display area of the transparent substrate, and light that is generated by the light from the light collection section A region where a light collecting element and a photovoltaic element are provided in a non-display area of the transparent substrate Outside the region, an organic EL display device is characterized by providing reflected and the reflection member to guide the light collecting portion of light from the organic light emitting layer.

  In the second organic EL display device according to the present invention, the transparent substrate may be a color filter substrate, and a color filter layer may be provided in a display region of the color filter substrate.

  In the second organic EL display device according to the present invention, the light condensing part may be composed of a scratch part or a lens part formed on the surface of the transparent substrate.

  According to the present invention, the transparent substrate emits the light from the organic light emitting layer of the organic EL layer toward the observation side, and the light from the organic light emitting layer of the organic EL layer is emitted toward the observation side. The non-display area is divided into non-display areas, and a condensing part for condensing light and a photovoltaic element for generating electric power from the light from the condensing part are provided in the non-display area of the transparent substrate. For this reason, the light radiated from the organic EL layer toward the observation side and propagating through the transparent substrate can be converted into electricity by the photovoltaic device through the light collecting unit. By using the organic EL layer, the power consumption of the organic EL display device can be reduced. In addition, a reflective material that reflects light from the organic light emitting layer and guides it to the light collecting portion is provided in a region other than the region where the light collecting portion and the photovoltaic element are provided in the non-display region of the transparent substrate. . For this reason, more light propagating through the transparent substrate can be guided to the light collecting unit, and this can further reduce the power consumption of the organic EL display device.

1A is a longitudinal sectional view showing the organic EL display device according to the first embodiment of the present invention, and FIG. 1B is a color filter substrate of the organic EL display device shown in FIG. FIG. 1C is a view of the color filter substrate of the organic EL display device shown in FIG. FIG. 2 is an enlarged view showing a color filter substrate provided with a light collecting section and a photovoltaic device in the first embodiment of the present invention. FIGS. 3A and 3B are views showing a state in which light from an organic light emitting layer is incident on a photovoltaic element in the first embodiment of the present invention. FIGS. 4A, 4B, 4C, and 4D are diagrams illustrating an example in which the light collecting unit is formed of a scratch unit in the first embodiment of the present invention. FIGS. 5A, 5B, 5C, and 5D are diagrams showing examples in which the light condensing unit is formed of a lens unit in the first embodiment of the present invention. FIG. 6A is a diagram showing an example in which a reflective material is provided in the non-display area on the other side of the color filter substrate in the first embodiment of the present invention, and FIG. FIG. 6C is a diagram showing an example in which a light collecting unit and a photovoltaic device are provided on the side surface of a color filter substrate in the first embodiment of the invention, and FIG. 6C is the first embodiment of the present invention. FIG. 5 is a diagram showing an example in which a reflective material is provided in a non-display region of the organic EL element substrate. FIG. 7 is a longitudinal sectional view showing an organic EL display device according to a second embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, the entire organic EL display device 10 in the present embodiment will be described with reference to FIGS.

Organic EL Display Device As shown in FIG. 1, the organic EL display device 10 includes an organic EL element substrate 21 and an organic EL layer 22 provided on a surface 21 a on one side of the organic EL element substrate 21. The EL element 20 includes a color filter substrate (transparent substrate) 31 provided on the organic EL layer 22 side of the organic EL element 20 and positioned on the observation side (the upper side of the organic EL display device 10 in FIG. 1). ing. As shown in FIG. 1, the organic EL layer 22 includes an anode 23 located on the organic EL element substrate 21 side, a cathode 25 located on the color filter substrate 31 side (observation side), an anode 23 and a cathode. And an organic light emitting layer 24 including a white light emitting layer.
The organic EL display device 10 according to the present embodiment is a so-called top emission type, and light emitted from the organic light emitting layer 24 of the organic EL layer 22 is transmitted through the color filter substrate 31 and emitted to the observation side.

Organic EL Element Substrate The organic EL element substrate 21 is not particularly limited as long as it supports the organic EL layer 22 and can block outside air, but has good stability, durability, and the like. Therefore, glass or a transparent polymer is preferable. In the present invention, since light is extracted from the color filter substrate 31 side, the organic EL element substrate 21 may be transparent or opaque.

The anode 23 is disposed between the organic EL element substrate 21 and the organic light emitting layer 24. The anode 23 forms an electrode for causing the white light emitting layer to emit light, and is an electrode having a charge opposite to that of the cathode 25.

  Examples of the material for forming the anode 23 used in the present invention include metals, alloys, and mixtures thereof having a work function as small as about 4 eV or less. Specifically, sodium, sodium-potassium alloy, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide (Al2O3) mixture, indium, lithium / aluminum A mixture, a rare earth metal, etc. can be illustrated. More preferably, a magnesium / silver mixture, a magnesium / aluminum mixture, a magnesium / indium mixture, an aluminum / aluminum oxide (Al2O3) mixture, and a lithium / aluminum mixture can be mentioned. As a material for forming the anode 23, a metal oxide having transparency and conductivity may be used.

  The anode 23 preferably has a sheet resistance of several Ω / cm or less. The film thickness of the anode 23 is usually about 10 nm to 1 μm.

  As a method for forming the anode 23, for example, a method of patterning by a photolithography method after forming a thin film by a vapor deposition method or a sputtering method is preferably used.

The cathode cathode 25 is provided to apply voltage to the organic light emitting layer 24 sandwiched between the anode 23 and cause the white light emitting layer of the organic light emitting layer 24 to emit light. Further, the light generated in the white light emitting layer is transmitted to the color filter substrate 31 side. Therefore, it is disposed between the organic light emitting layer 24 and the color filter substrate 31.

  Examples of the material for forming the cathode 25 used in the present invention include a metal oxide having transparency and conductivity. Examples of such metal oxides include indium tin oxide (ITO), indium oxide, zinc oxide, and stannic oxide.

  The cathode 25 is usually about 100 nm to 300 nm.

  As a method for forming the cathode 25, for example, a method of patterning by photolithography after forming a thin film by vapor deposition or sputtering is preferably used.

  As described above, an example in which the anode 23 is located on the organic EL element substrate 21 side and the cathode 25 is located on the observation side is shown. However, the present invention is not limited to this, and the anode 23 may be disposed on the observation side and the cathode 25 may be disposed on the organic EL element substrate 21 side. Note that at least the electrode located on the observation side of the anode 23 and the cathode 25 is made of a material having transparency and conductivity.

Organic Light-Emitting Layer The organic light-emitting layer 24 used in the present invention has at least a light-emitting layer, but is usually composed of a plurality of organic layers, such as a hole injection layer (not shown) or an electron. Charge transport layer such as a charge injection layer such as an injection layer (not shown), a hole transport layer (not shown) for transporting holes to the light emitting layer, and an electron transport layer (not shown) for transporting electrons to the light emitting layer. It can have. As the light-emitting layer, each light-emitting layer has a three-color coating type having a light emission spectrum in a wavelength range of blue light (430 nm to 470 nm), green light (470 nm to 600 nm), and red light (600 nm to 700 nm), a white light emitting layer A type having

a) White Light-Emitting Layer The white light-emitting layer used in the present invention only needs to be capable of emitting white light. As such a white light emitting layer, specifically, when a voltage is applied to the organic light emitting layer 24, at least blue light (430 nm to 470 nm), green light (470 nm to 600 nm), and red light (600 nm to 600 nm) 700 nm), but the ratio of the maximum emission intensity of the green light (470 nm to 600 nm) peak to the maximum emission intensity of the blue light (430 nm to 470 nm) peak in the emission spectrum (green light). The maximum emission intensity of the peak / the maximum emission intensity of the blue light peak) is preferably in the range of 0.3 to 0.8, more preferably in the range of 0.3 to 0.7, particularly It is preferable to be within the range of 0.3 to 0.5. When the ratio of the maximum emission intensity of the green light peak and the maximum emission intensity of the blue light peak is within the above range, the power consumption reduction effect due to the large transmittance of the blue pattern is more effectively exhibited. Because you can. For red light (600 nm to 700 nm), the ratio of the maximum emission intensity of the red light peak and the maximum emission intensity of the blue light peak may be within a predetermined range, and the intensity ratio is 0.3 to 1.0. It is preferable that

  The material constituting the white light emitting layer is not particularly limited as long as it emits fluorescence or phosphorescence. In addition, the white light emitting layer may have a hole transport property or an electron transport property. Examples of the material constituting the white light emitting layer include dye-based materials, metal complex-based materials, and polymer-based materials.

  Examples of the dye material include cyclopentamine derivatives, tetraphenylbutadiene derivatives, triphenylamine derivatives, oxadiazol derivatives, pyrazoloquinoline derivatives, distyrylbenzene derivatives, distyrylarylene derivatives, silole derivatives, thiophene ring compounds, pyridine Examples thereof include ring compounds, perinone derivatives, perylene derivatives, oligothiophene derivatives, trifumanylamine derivatives, oxadiazole dimers, and pyrazoline dimers.

  Examples of the metal complex material include an aluminum quinolinol complex, a benzoquinolinol beryllium complex, a benzoxazole zinc complex, a benzothiazole zinc complex, an azomethylzinc complex, a porphyrin zinc complex, and a europium complex, or Al, Zn, Be as a central metal. Or a metal complex having a rare earth metal such as Tb, Eu, or Dy, and having a ligand such as oxadiazole, thiadiazole, phenylpyridine, phenylbenzimidazole, and quinoline structure.

  Examples of the polymer material include polyparaphenylene vinylene derivatives, polythiophene derivatives, polyparaphenylene derivatives, polysilane derivatives, polyacetylene derivatives, etc., polyfluorene derivatives, polyvinylcarbazole derivatives, and the dye materials and metal complex materials described above. A polymerized product can be exemplified.

  Examples of the method for forming the white light emitting layer include a vapor deposition method, a printing method, an inkjet method, a spin coating method, a casting method, a dipping method, a bar coating method, a blade coating method, a roll coating method, a gravure coating method, and a flexographic printing method. , Spray coating, and self-assembly method (alternate adsorption method, self-assembled monolayer method). In particular, it is preferable to use a vapor deposition method, a spin coating method, and an inkjet method.

  The film thickness of the white light emitting layer used in the present invention is usually about 5 nm to 5 μm.

b) Hole Injection Layer In the present invention, a hole injection layer may be formed between the white light emitting layer and the anode 23. This is because by providing the hole injection layer, the injection of holes into the white light emitting layer is stabilized and the light emission efficiency can be increased.

  As a material for forming the hole injection layer used in the present invention, a material generally used for the hole injection layer of the organic EL layer 22 can be used. The material for forming the hole injection layer may be any material that has either a hole injection property or an electron barrier property.

  Specifically, the hole injection layer forming material includes triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazoles. Examples include derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, polysilane-based, aniline-based copolymers, and conductive polymer oligomers such as thiophene oligomers. Furthermore, examples of the material for forming the hole injection layer include porphyrin compounds, aromatic tertiary amine compounds, and styrylamine compounds.

  The thickness of the hole injection layer is usually about 5 nm to 1 μm.

c) Electron Injection Layer In the present invention, an electron injection layer may be formed between the white light emitting layer and the cathode 25. This is because by providing the electron injection layer, the injection of electrons into the white light emitting layer is stabilized, and the light emission efficiency can be increased.

  Examples of the material for forming the electron injection layer used in the present invention include heterocyclic tetracarboxylic anhydrides such as nitro-substituted fluorene derivatives, anthraquinodimethane derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, naphthaleneperylene, carbodiimides, Fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxadiazole derivatives, thiazole derivatives in which the oxygen atom of the oxadiazole ring of the oxadiazole derivative is replaced with a sulfur atom, quinoxaline ring known as an electron withdrawing group Examples thereof include quinoxaline derivatives having bismuth, metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum, phthalocyanines, metal phthalocyanines, and distyrylpyrazine derivatives.

  The film thickness of the electron injection layer is usually about 5 nm to 1 μm.

  Further, as shown in FIG. 1A, the organic EL layer 22 provided on the organic EL element substrate 21 may be covered with a barrier film 26 that shields moisture. The barrier film 26 is formed by laminating a plurality of, for example, 20 layers. Examples of the material of each layer of the barrier film 26 include silicon, aluminum, zinc, tin oxide, and oxynitride. Further, a desiccant (not shown) that adsorbs water vapor in the organic EL display device 10 between the organic EL element substrate 21 and the color filter substrate 31 does not interfere with light emission from the organic EL layer 22. You may arrange. Examples of the desiccant material include barium or calcium oxide.

  Further, an insulating layer (not shown) may be provided to prevent the anode 23 and the cathode 25 from coming into direct contact.

  As a material for forming the insulating layer used in the present invention, for example, a photocurable resin such as a photosensitive polyimide resin or an acrylic resin, a thermosetting resin, an inorganic material, or the like can be used.

  The pattern of the insulating layer is usually linear, and for example, a pattern having openings such as a matrix shape or a stripe shape is exemplified.

  In addition, as a method for forming the insulating layer, a method of applying the above-described insulating layer forming material and patterning by a photolithography method can be given. Also, a printing method or the like can be used.

  As shown in FIG. 1 (a), a sealing material 40 is provided between the organic EL element substrate 21 and the color filter substrate 31, whereby the organic EL element substrate 21 and the color filter substrate are provided. A storage space 41 for storing the above-described organic EL layer 22 and a color filter layer 37 described later is formed between the substrate 31 and the substrate 31. As the sealing material 40, the distance between the organic EL element substrate 21 and the color filter substrate 31 can be kept constant, and the organic EL layer 22 can be prevented from coming into contact with moisture in the atmosphere. Although it will not specifically limit if it is a thing, For example, an adhesive agent, low melting glass, etc. can be used. Examples of the adhesive include vinyl chloride resin, phenol resin, silicon resin, epoxy resin, polyester resin, urethane resin, acrylic resin, polybutadiene resin, and vinyl acetate resin. It is preferable to use a resin having an adhesion function composed of a combination of two or more species.

Color Filter Substrate Next, the color filter substrate 31 will be described in detail. The material of the color filter substrate 31 is not particularly limited as long as light emitted from the organic EL layer 22 can be taken out to the observation side and moisture and oxygen can be effectively blocked. However, it is preferable to use glass, polymer, or the like in view of adhesion to the sealing material 40, light transmittance, stability, durability, and the like.

  FIG. 1B is a view of the observation side (one side) surface 31a of the color filter substrate 31 shown in FIG. 1A as viewed from the arrow A, and FIG. It is the figure which looked at the organic EL element 20 side (other side) surface 31b from the arrow B among the substrate 31 for color filters shown to a). As shown in FIG. 1A, the color filter substrate 31 includes a display region 32 in which light from the organic light emitting layer 24 of the organic EL layer 22 is emitted toward the observation side, and organic light emission of the organic EL layer 22. It is partitioned into a non-display area 33 in which light from the layer 24 is not emitted toward the observation side. As will be described later, the display area 32 of the color filter substrate 31 is an area (opening) surrounded by a black matrix layer 38 provided on the other surface 31 b of the color filter substrate 31. Yes. The non-display area 33 of the color filter substrate 31 is an area where the black matrix layer 38 is provided or an area not surrounded by the black matrix layer 38.

The display region 32 of the color filter substrate 31 includes a display region 32a on one side which is an opening portion of the surface 31a on one side of the color filter substrate 31 (see FIG. 1B), and other than the color filter substrate 31. It includes a display area 32b on the other side which is an opening of the side surface 31b (see FIG. 1C).
The non-display area 33 of the color filter substrate 31 is the non-display area 33a on one side of the surface 31a on one side of the color filter substrate 31 (see FIG. 1B) and the other side of the color filter substrate 31. The surface 31b includes a non-display region 33b on the other side outside the dotted line region shown in FIG. 1C, and a side surface 31c of the color filter substrate 31 (see FIG. 1A). As shown in FIG. 1B and FIG. 1C, the non-display area 33a on one side and the non-display area 33b on the other side include an area located on the periphery of the color filter substrate 31, a display area 32a, And a region located between 32b.

  As shown in FIGS. 1A and 1B, in the peripheral region of the non-display region 33a on one side of the color filter substrate 31, light from the organic light emitting layer 24 is used as described later. A condensing part 34 for condensing light propagating by repeating total reflection inside the substrate 31 and a photovoltaic element 35 for generating electric power by the light from the condensing part 34 are provided. As shown in FIG. 1A, the photovoltaic element 35 and the drive circuit (not shown) for the organic EL layer 22 are connected via a pair of conductors 39, whereby the photovoltaic element 35 is connected. The electricity generated by the above can be supplied to the organic EL layer 22.

  Further, as shown in FIGS. 1A and 1B, a condensing portion 34 and a photovoltaic element 35 are provided in the peripheral region and the side surface 31c of the non-display region 33a on one side of the color filter substrate 31. In the non-existing region, there is provided a reflecting material 36 that reflects the light from the organic light emitting layer 24 and propagates inside the color filter substrate 31 to guide it to the light collecting unit 34.

  Next, the condensing part 34, the photovoltaic device 35, and the reflective material 36 are each explained in full detail. First, the light collecting unit 34 will be described in detail.

Condensing unit Figure 2 is an enlarged view showing a light collecting portion 34 of FIG. 1 (a). As shown in FIG. 2, the condensing part 34 includes a triangular scratch part 34 a formed by cutting out a part of one surface 31 a of the color filter substrate 31. By cutting out a part of the one surface 31a in this way, as will be described later, it is possible to take out light propagating through repeated total reflection inside the color filter substrate 31 from the triangular scratch portion 34a. As a notching method for forming the triangular scratch portion 34a, various processing methods can be used, for example, mechanical cutting, sandblasting, etching, or the like can be used.

As shown in the photovoltaic element also FIG. 2, the photovoltaic device 35 includes a solar cell 35a provided so as to cover the triangular scratch portion 34a. Thus, by providing the solar cell 35a so as to cover the triangular scratch portion 34a, the light condensed on the triangular scratch portion 34a can be incident on the solar cell 35a. When light enters the solar cell 35a, the light is converted into electricity by the solar cell 35a. The electricity thus generated is supplied to the drive circuit of the organic EL layer 22 through the pair of conductors 39 as described above.

As the solar cell 35a, various types of solar cells such as a pn junction solar cell, a dye-sensitized solar cell, and an organic thin film solar cell can be used.
Among these, pn junction solar cells include various types such as silicon (single crystal, polycrystal, amorphous, thin film, etc.), compound (GaAs, chalcopyrite, etc.). A solar cell described in Japanese Patent No. 2023397 or registered Utility Model No. 2511509 can be given.
Examples of the dye-sensitized solar cell include a Gretzell type having a structure in which a titanium dioxide layer having a dye adsorbed between two transparent electrodes and an electrolytic solution are sandwiched. In this case, a ruthenium complex or the like can be used as the dye, and an electrolytic solution in which iodine is dissolved can be used as the electrolytic solution. Examples of such a dye-sensitized solar cell include a dye-sensitized solar cell described in Japanese Patent No. 4278615 or Japanese Patent No. 3683899.

  As a method of forming the solar cell 35a so as to cover the triangular scratch portion 34a, for example, a method of depositing the material of the solar cell 35a on the surface of the triangular scratch portion 34a can be cited. Further, when a flexible solar cell such as a thin film silicon pn junction solar cell or a dye-sensitized solar cell is used, a commercially available solar cell may be provided on the surface of the triangular scratch portion 34a by pasting or the like. .

The material of the reflecting material reflector 36 is not particularly limited as long as it can reflect light, and examples thereof include various metal materials, particularly aluminum, nickel, chromium, and the like. The thickness of the reflective material 36 is not particularly limited as long as sufficient reflection intensity can be obtained and the thickness does not peel from the surface of the color filter substrate 31. The method of forming the reflector 36 is not particularly limited, and a color filter substrate can be obtained by using a vacuum deposition method, a sputtering method, a CVD method, an electroless plating solution method, an electroplating solution method, a coating method, an ion plating method, or the like. The reflective material 36 may be densely formed on the surface of 31, or the reflective material 36 made of a metal thin film or the like may be provided on the surface of the color filter substrate 31 by pasting or the like. In the reflective material 36 thus formed, the reflectance with respect to light having a wavelength of 550 nm is preferably 70% or more.

Color filter layer Next, the color filter layer 37 will be described. As shown in FIGS. 1A and 1C, on the other surface 31b of the color filter substrate 31, a plurality of color filter layers for correcting light from the organic EL layer 22 or increasing color purity are provided. 37 is provided, and a black matrix layer 38 is provided between the color filter layers 37. The color filter 30 is composed of the color filter substrate 31, the plurality of color filter layers 37, and the black matrix layer 38. As shown in FIG. 1C, the area surrounded by the black matrix layer 38 is a display area 32 b on the other side of the color filter substrate 31.

The color filter layer 37 is composed of any one of a red colored layer, a blue colored layer, and a green colored layer provided corresponding to the unit pixel of the organic EL display device 10. The red colored layer, the blue colored layer, and the green colored layer are layers formed by dispersing or dissolving a colorant such as a pigment or dye of each color in a photosensitive resin.
Among these, examples of the colorant used in the red colored layer include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. These pigments may be used alone or in combination of two or more.
Examples of the colorant used in the blue colored layer include copper phthalocyanine pigments, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, dioxazine pigments, and the like. These pigments may be used alone or in combination of two or more.
Examples of the colorant used in the green coloring layer include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindolinone pigments. And pigments. These pigments or dyes may be used alone or in combination of two or more.

  Examples of the material of the black matrix layer 38 include a resin composition containing a black colorant such as carbon black and titanium black. As the resin used in this resin composition, for example, a photosensitive resin having a reactive vinyl group such as an acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber can be used.

  Next, the operation of the present embodiment having such a configuration will be described. Here, the light path from the organic light emitting layer 24 in the organic EL display device 10 will be described, and the operation of converting the light from the organic light emitting layer 24 into electricity by the photovoltaic element 35 will be described.

  3A and 3B, arrows (1) to (4) indicate light paths from the organic light emitting layer 24 in the organic EL display device 10.

  In FIG. 3A, an arrow (1) indicates a path of light emitted from the organic light emitting layer 24, transmitted through the color filter layer 37 and the color filter substrate 31, and emitted to the observation side. The light passing through the path indicated by the arrow (1) is light extracted from the organic EL display device 10 to the observation side, and is used as display light.

  In FIG. 3A, the arrow (2) indicates that the total reflection is repeated inside the color filter substrate 31 without being emitted from the color filter substrate 31 to the observation side after being emitted from the organic light emitting layer 24. It shows the path of propagating light. Further, as shown in FIG. 3A, the peripheral area of the non-display area 33a on one side of the color filter substrate 31 is formed by cutting out a part of the one surface 31a as described above. A triangular scratch portion 34a is provided. In this case, the critical angle of total reflection at the location where the triangular scratch portion 34a is provided on the one surface 31a is different from the critical angle of total reflection at the location where the triangular scratch portion 34a is provided. For this reason, the light that reaches the triangular scratch portion 34a by repeating total reflection inside the color filter substrate 31 can be emitted outward from the triangular scratch portion 34a. The light emitted outward from the triangular scratch portion 34a enters the solar cell 35a of the photovoltaic element 35 as shown in FIG. 3A, and this light is converted into electricity by the solar cell 35a. The generated electricity is supplied to the drive circuit of the organic EL layer 22 through the pair of conductors 39 as described above.

  In FIG. 3A, an arrow (3) is propagated by repeating total reflection inside the color filter substrate 31, then reflected by the reflective material 36 provided on the side surface 31 c of the color filter substrate 31, and then triangular. The path | route of the light which reaches | attains the shape scratch part 34a is shown. The light indicated by the arrow (3) reaches the triangular scratch portion 34a and then exits outward from the triangular scratch portion 34a, as in the case of the light indicated by the arrow (2). Then, as shown to Fig.3 (a), it injects into the solar cell 35a of the photovoltaic device 35, and this light is converted into electricity by the solar cell 35a. The generated electricity is supplied to the drive circuit of the organic EL layer 22 through the pair of conductors 39, as in the case of the light indicated by the arrow (2).

  In FIG. 3B, an arrow (4) is emitted from the organic light emitting layer 24, and then is emitted from the color filter substrate 31 to the observation side without being emitted from the color filter substrate 31 to the observation side 31a. The path of light that has been totally reflected and returned to the organic EL layer 22 is shown. In this case, the light that has returned to the organic EL layer 22 is reflected by the anode 23 made of metal, travels again to the color filter substrate 31, and then reaches the triangular scratch portion 34a. The light reaching the triangular scratch portion 34a is converted into electricity by the solar cell 35a as in the case described above.

  As described above, according to the present embodiment, the light condensing part 34 including the triangular scratch part 34 a and the light from the light converging part 34 are applied to the peripheral area of the non-display area 33 a on one side of the color filter substrate 31. A photovoltaic element 35 having a solar cell 35a that converts electricity is provided. Therefore, the light emitted from the organic EL layer 22 toward the observation side and propagating through the color filter substrate 31 without being radiated from the color filter substrate 31 to the observation side is converted into the light collecting unit. It can be converted into electricity by the photovoltaic element 35 via 34. Then, by supplying the generated electricity to the drive circuit of the organic EL layer 22 through the pair of conductors 39, the power consumption of the organic EL display device 10 can be reduced.

  Further, according to the present embodiment, organic light emission is performed in a region where the light collecting unit 34 and the photovoltaic element 35 are not provided in the peripheral region and the side surface 31c of the non-display region 33a on one side of the color filter substrate 31. A reflector 36 is provided that reflects light from the layer 24 and guides it to the light collector 34. For this reason, more light propagating through the color filter substrate 31 can be guided to the condensing unit 34, which can further reduce the power consumption of the organic EL display device 10.

  In the present embodiment, as shown in FIGS. 2 and 4A, an example in which the light collecting portion 34 is formed of a triangular scratch portion 34a has been described. However, the present invention is not limited to this, and as shown in FIGS. 4B, 4C, and 4D, the condensing unit 34 is replaced with a semi-elliptical scratch unit 34b, a semi-circular scratch unit 34c, or a rectangular scratch. You may form by the part 34d. Alternatively, as shown in FIGS. 5 (a), (b), (c), and (d), the condensing unit 34 may be a triangular lens unit 34e, a semi-elliptical lens unit 34f, a semi-circular lens unit 34g, or a quadrangular shape. You may form by the lens part 34h. By providing the light condensing part 34 composed of such scratch parts 34 a, 34 b, 34 c, 34 d or lens parts 34 e, 34 f, 34 g, 34 h in the non-display area 33 of the color filter substrate 31, The critical angle of total reflection in the condensing part 34 on the surface can be made different from the critical angle of total reflection in other places of the color filter substrate 31, and thereby the total reflection is performed inside the color filter substrate 31. Light that is repeatedly propagated can be emitted outward at the light collecting section 34. In this case, the solar cell 35a is formed by vapor deposition or the like so as to cover the scratch portions 34a, 34b, 34c, 34d or the lens portions 34e, 34f, 34g, 34h, as in the case described above.

Further, in the present embodiment, an example is shown in which the reflective material 36 is provided in the peripheral region and the side surface 31c of the non-display region 33a on one side of the non-display region 33 of the color filter substrate 31. However, the present invention is not limited to this. As shown in FIG. 6A, the reflective material 36 may be provided in the peripheral area of the non-display area 33 b on the other side of the non-display area 33 of the color filter substrate 31. Good. Accordingly, the light propagating through the color filter substrate 31 without being emitted from the color filter substrate 31 to the observation side can be more reliably totally reflected on the surface of the color filter substrate 31, thereby More light can be guided to the light collecting unit 34.
Further, as shown in FIG. 6B, a reflective material 36 may be further provided in the non-display area of the organic EL element substrate 21. As a result, more light can be guided to the light collecting unit 34.
Further, although not shown, the reflective material 36 may be provided in an area located between the display areas 32a and 32b among the non-display areas 33a and 33b of the color filter substrate 31. As a result, more light can be guided to the light collecting unit 34.

  Further, in the present embodiment, an example is shown in which the light collector 34 and the photovoltaic element 35 are provided in the peripheral region of the non-display region 33a on one side of the non-display region 33 of the color filter substrate 31. . However, the present invention is not limited to this, and as shown in FIG. 6C, the light collecting portion 34 and the photovoltaic element 35 may be provided on the side surface 31 c of the color filter substrate 31.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a longitudinal sectional view showing the organic EL element in the second embodiment of the present invention.

  The second embodiment shown in FIG. 7 is different only in that the organic EL element is a so-called bottom emission type, and other configurations are substantially the same as those of the first embodiment shown in FIGS. It is. In the second embodiment shown in FIG. 7, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

Organic EL Display Device As shown in FIG. 7, an organic EL display device 10 includes a color filter substrate (transparent substrate) 31 having a surface 31a on one side located on the observation side and a surface 31b on the other side, and a color And an organic EL element 20 provided on the other surface 31 b of the filter substrate 31. Among these, the organic EL element 20 includes an organic EL element substrate 21 and an organic EL layer 22 provided between the organic EL element substrate 21 and the color filter substrate 31. The organic EL layer 22 includes an anode 23 located on the organic EL element substrate 21 side, a cathode 25 located on the color filter substrate 31 side (observation side), and an organic provided between the anode 23 and the cathode 25. And a light emitting layer 24. Further, as shown in FIG. 7, a plurality of colors for correcting light from the organic EL layer 22 of the organic EL element 20 or increasing color purity between the color filter substrate 31 and the organic EL element 20. A filter layer 37 is provided, and a black matrix layer 38 is provided between the color filter layers 37. Similar to the case of the first embodiment shown in FIGS. 1 to 6, the color filter 30 is composed of the color filter substrate 31, the color filter layer 37, and the black matrix layer 38.
The organic EL display device 10 in the present embodiment is a so-called bottom emission type, and light emission from the organic light emitting layer 24 of the organic EL element 20 provided on the other surface 31 b of the color filter substrate 31 is emitted from the color filter 30. Is transmitted to the observation side (the lower side of the organic EL display device 10 in FIG. 7).

  The anode 23, the organic light emitting layer 24, and the cathode 25 of the organic EL layer 22 in the present embodiment are substantially the same as those in the first embodiment shown in FIGS. . As in the case of the first embodiment shown in FIGS. 1 to 6, the anode 23 may be disposed on the observation side, and the cathode 25 may be disposed on the organic EL element substrate 21 side. Here, at least the electrode located on the observation side of the anode 23 and the cathode 25 is made of a material having transparency and conductivity.

  As shown in FIG. 7, in the peripheral area of the non-display area 33 a on one side of the color filter substrate 31 of the color filter 30, the light collecting light that propagates by repeating total reflection inside the color filter substrate 31 is collected. An optical unit 34 and a photovoltaic element 35 that generates electric power from the light from the condensing unit 34 are provided. Further, as shown in FIG. 7, the photovoltaic element 35 and the drive circuit (not shown) for the organic EL layer 22 are connected via a pair of conductors 39, thereby being generated by the photovoltaic element 35. The electricity can be supplied to the organic EL layer 22. Thereby, the power consumption of the organic EL display device 10 can be reduced.

  In addition, as shown in FIG. 7, the peripheral region and the side surface 31 c of the non-display region 33 a on one side of the color filter substrate 31 and the region where the light collector 34 and the photovoltaic element 35 are not provided are organic A reflector 36 is provided that reflects the light from the light emitting layer 24 that propagates through the color filter substrate 31 and guides it to the light collector 34. For this reason, more light can be guide | induced to the condensing part 34, and, thereby, the power consumption of the organic electroluminescence display 10 can be reduced more.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

Example 1
The organic EL element substrate 21 provided with the three-color coating type organic EL layer 22 and the color filter substrate 31 were bonded to each other with a sealing material 40 to produce the organic EL display device 10 having a top emission structure. After the reflective material 36 made of Al was deposited on the side surface 31 c of the color filter substrate 31, the photovoltaic element 35 was placed in the non-display area 33 a on the observation side surface 31 a of the color filter substrate 31. Moreover, the photovoltaic device 35 and the electrode of the organic EL layer 22 of the organic EL display device 10 were connected by Cu wiring, and the circuit which supplies the electric power produced | generated by the photovoltaic device 35 to the electrode of the organic EL layer 22 was produced. In Example 1, the color filter layer 37 was not provided on the color filter substrate 31.

The organic EL display device 10 was lit for 1 hour in a state where the driving power of the organic EL layer 22 was adjusted so that the luminance measured on the observation side of the organic EL display device 10 was 400 cd / m ² . As a result of measuring the power consumption at that time, the power consumption was 100 (arbitrary unit).

(Example 2)
The power consumption of the organic EL display device 10 was measured in the same manner as in Example 1 except that the reflective material 36 was provided over the entire non-display area 33 of the color filter substrate 31. The measured power consumption was 90.

(Example 3)
The power consumption of the organic EL display device 10 was measured in the same manner as in Example 2 except that the color filter layer 37 was provided on the color filter substrate 31. The measured power consumption was 102.

Example 4
The power consumption of the organic EL display device 10 was measured in the same manner as in Example 3 except that the organic EL display device 10 had a bottom emission structure. The measured power consumption was 107.

(Comparative Example 1)
The power consumption of the organic EL display device 10 is the same as in Example 1 except that the photovoltaic element 35 is not installed and the reflective material 36 is not provided on the side surface 31c of the color filter substrate 31. Was measured. The measured power consumption was 110.

(Comparative Example 2)
The power consumption of the organic EL display device 10 was measured in the same manner as in Example 2 except that the reflective material 36 was not provided in the non-display area 33 of the color filter substrate 31. The measured power consumption was 108.

(Comparative Example 3)
The power consumption of the organic EL display device 10 was measured in the same manner as in Example 3 except that the reflective material 36 was not provided in the non-display area 33 of the color filter substrate 31. The measured power consumption was 117.

(Comparative Example 4)
The power consumption of the organic EL display device 10 was measured in the same manner as in Example 4 except that the reflective material 36 was not provided in the non-display area 33 of the color filter substrate 31. The measured power consumption was 119.

Table 1 is a table collectively showing the power consumption of the organic EL display device 10 in Examples 1 to 4 and Comparative Examples 1 to 4.

  As can be seen from the comparison between Examples 1 to 4 and Comparative Examples 1 to 4, consumption of the organic EL display device 10 is achieved by providing the photovoltaic element 35 and the reflector 36 in the non-display area 33 of the color filter substrate 31. The amount of power could be reduced.

  As can be seen from the comparison between Example 1 and Example 2, when the reflective material 36 is provided over the entire non-display region 33 of the color filter substrate 31, the power consumption of the organic EL display device 10 is further reduced. I can say that.

DESCRIPTION OF SYMBOLS 10 Organic EL display device 20 Organic EL element 21 Organic EL element substrate 21a One side surface of organic EL element substrate 22 Organic EL layer 23 Anode 24 Organic light emitting layer 25 Cathode 26 Barrier film 30 Color filter 31 Color filter substrate 31a One side surface 31b of the color filter substrate 31b The other side surface of the color filter substrate 31c The side surface of the color filter substrate 32 The display region of the color filter substrate 32a The display region of the one side 32b The display region of the other side 33 Non-display area of the color filter substrate 33a Non-display area on one side 33b Non-display area on the other side 34 Condensing part 34a Triangular scratch part 34b Semi-elliptical scratch part 34c Semi-circular scratch part 34d Square Shape scratch part 34e Triangular lens part 34f Semi-elliptical lens part 34 Semicircular lens unit 34h quadrangular lens portion 35 photovoltaic element 35a solar cell 36 reflector 37 color filter layer 38 black matrix layer 39 conductor 40 sealing member 41 housing space 42 overcoat layer

Claims (7)

An organic EL element having an organic EL element substrate and an organic EL layer provided on one surface of the organic EL element substrate;
A transparent substrate provided on the organic EL layer side of the organic EL element and positioned on the observation side,
The organic EL layer has an anode, a cathode, and an organic light emitting layer provided between the anode and the cathode,
The transparent substrate has a display area where light from the organic light emitting layer of the organic EL layer is emitted toward the observation side, a non-display area where light from the organic light emitting layer of the organic EL layer is not emitted toward the observation side, and Divided into
A non-display area of the transparent substrate is provided with a condensing part that condenses light, and a photovoltaic element that generates electricity by the light from the condensing part,
A reflective material that reflects light from the organic light emitting layer and guides it to the condensing portion is provided in a region other than the region where the condensing portion and the photovoltaic element are provided in the non-display region of the transparent substrate. Organic EL display device. The transparent substrate comprises a color filter substrate,
The organic EL display device according to claim 1, wherein a color filter layer is provided in a display region of the color filter substrate.   A sealing material is provided between the organic EL element substrate and the transparent substrate, and a storage space for accommodating the organic EL layer is formed between the organic EL element substrate and the transparent substrate by the sealing material. The organic EL display device according to claim 1.   2. The organic EL display device according to claim 1, wherein the condensing unit includes a scratch unit or a lens unit formed on a surface of a transparent substrate. A transparent substrate having a surface on one side located on the observation side and a surface on the other side;
An organic EL element provided on the other surface of the transparent substrate,
The organic EL element has an organic EL element substrate, and an organic EL layer provided between the organic EL element substrate and the transparent substrate,
The organic EL layer has an anode, a cathode, and an organic light emitting layer provided between the anode and the cathode,
The transparent substrate has a display area where light from the organic light emitting layer of the organic EL layer is emitted toward the observation side, a non-display area where light from the organic light emitting layer of the organic EL layer is not emitted toward the observation side, and Divided into
A non-display area of the transparent substrate is provided with a condensing part that condenses light, and a photovoltaic element that generates electricity by the light from the condensing part,
A reflective material that reflects light from the organic light emitting layer and guides it to the condensing portion is provided in a region other than the region where the condensing portion and the photovoltaic element are provided in the non-display region of the transparent substrate. Organic EL display device. The transparent substrate comprises a color filter substrate,
6. The organic EL display device according to claim 5, wherein a color filter layer is provided in a display area of the color filter substrate.   6. The organic EL display device according to claim 5, wherein the condensing unit is composed of a scratch unit or a lens unit formed on the surface of the transparent substrate.

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