JP2007103027A - Organic electroluminescent display device and its manufacturing method - Google Patents

Organic electroluminescent display device and its manufacturing method Download PDF

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JP2007103027A
JP2007103027A JP2005287558A JP2005287558A JP2007103027A JP 2007103027 A JP2007103027 A JP 2007103027A JP 2005287558 A JP2005287558 A JP 2005287558A JP 2005287558 A JP2005287558 A JP 2005287558A JP 2007103027 A JP2007103027 A JP 2007103027A
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layer
color filter
organic el
display device
opening
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JP2005287558A
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Manabu Harada
Tetsuji Komura
学 原田
哲司 小村
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Sanyo Electric Co Ltd
三洋電機株式会社
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Abstract

An organic EL display device capable of preventing deterioration of an organic EL element due to ultraviolet rays and capable of sufficiently curing a photocurable resin and a method for manufacturing the same.
An organic EL element panel in which a plurality of organic EL elements are disposed on a main surface of a substrate, and a sealing panel disposed to face the main surface side of the organic EL element panel, A color filter layer 11 or a color conversion layer provided corresponding to the EL element, and a black matrix layer 12 provided around the color filter layer 11 or the color conversion layer is a surface on the opposite side of the translucent sealing substrate In an organic electroluminescence display device having a structure in which a sealing panel provided on the surface is bonded with a photocurable resin 9, an ultraviolet ray for introducing the photocurable resin 9 into the black matrix layer 12 is introduced. An opening 13 is formed.
[Selection] Figure 1

Description

  The present invention relates to a top emission type organic electroluminescence display device (organic EL display device) on which a translucent sealing substrate is bonded, and a method for manufacturing the same.

  In recent years, with the diversification of information equipment, there has been an increasing need for flat display elements that consume less power than commonly used CRTs (cathode ray tubes). As one of such flat display elements, organic electroluminescence (hereinafter abbreviated as “organic EL”) elements having features such as high efficiency, thinness, light weight, and low viewing angle dependence have been attracting attention. The development of the existing display is underway.

  Among organic EL elements, organic EL elements using an organic material as a light-emitting layer can change the emission color by selecting a fluorescent material that is a light-emitting material, and can be applied to multi-color and full-color display devices. Expectations for are increasing. In addition, since the organic EL element can emit light at a low voltage, it can be used as a backlight for a liquid crystal display device or the like.

  The organic EL element is currently in the stage of application to small displays such as digital cameras and mobile phones.

  In an organic EL element, an organic layer such as a first electrode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer and a second electrode are sequentially laminated on a substrate provided with a thin film transistor (TFT). Is known. The light emitted from the light emitting layer may be extracted from the TFT substrate side or extracted from the second electrode side. In the latter case, light can be extracted regardless of the wiring on the TFT substrate, so that the aperture ratio can be increased. Further, if the pixel size is increased in order to further increase the aperture ratio, the accuracy of the vapor deposition mask is limited in the RGB color separation method when producing a full-color organic EL display device, which is difficult. Therefore, a promising technique is to produce a single color light emitting layer without using a separate mask and convert it to RGB light emission color using a color filter or color conversion layer (CCM).

  In Patent Document 1, a fluorescent conversion layer and / or a color filter layer containing a fluorescent material, an organic layer, a barrier layer, and an organic EL structure are sequentially provided on a substrate, and the organic layer is an ultraviolet curable resin or an ultraviolet curable resin. An element structure characterized by this has been proposed. However, in such a structure, when a thermosetting resin is used, it is difficult to align the organic EL substrate with the color filter or the fluorescence conversion layer formed on the substrate. This is because, during thermosetting, the viscosity of the thermosetting resin is reduced, so that the substrates can move easily. Even when an ultraviolet curable resin is used, it is cured by irradiating ultraviolet rays through a color filter. However, since the transmittance of the color filter is almost zero in the ultraviolet wavelength region of 365 nm, the ultraviolet curable resin is cured. It was difficult.

  In order to solve the above-mentioned problem, Patent Document 2 proposes a structure in which an ultraviolet curable resin for temporary fixing is used in the outer peripheral portion and a thermosetting resin is used in other locations. In Patent Document 3, the transmittance of the red color filter and the blue color filter in the 300 to 430 nm region is set to 10% or more, and the green color filter is provided with an opening without a color filter, thereby transmitting ultraviolet rays. There has been proposed a method for curing an ultraviolet curable resin.

  In the method of Patent Document 2, a positional shift due to a decrease in viscosity at the time of thermosetting is suppressed, but problems peculiar to the thermosetting resin cannot be avoided. Thermosetting resins are classified into 1-component type and 2-component type. The one-component type has a high thermosetting temperature and damages the organic EL element. Although the two-component type has a low thermosetting temperature, there is a possibility that bubbles are mixed in to mix the two components. Moreover, since the pot life is short after stirring, an increase in viscosity occurs, and it is difficult to bond the substrates uniformly.

In the method of Patent Document 3, the ultraviolet transmittance of the red color filter and the blue color filter is reduced to 1/10. Therefore, it is necessary to increase the amount of ultraviolet rays irradiated to the ultraviolet curable resin by 10 times. The organic EL element may be deteriorated. In particular, in the green color filter, since the opening without the color filter is provided, the deterioration of the organic EL element due to the ultraviolet rays appears remarkably.
JP-A-11-260562 JP 2003-203762 A JP 2003-86358 A

  An object of the present invention is an organic EL display device having a structure in which an organic EL element panel and a sealing panel are bonded to each other with a photocurable resin, and the organic EL element is irradiated with ultraviolet rays that are irradiated to cure the photocurable resin. An object of the present invention is to provide an organic EL display device capable of preventing deterioration and sufficiently curing a photocurable resin, and a method for manufacturing the same.

  The present invention is an organic EL element in which a plurality of organic EL elements are arranged on a main surface of a substrate, and a sealing panel that is arranged to face the main surface side of the organic EL element panel. And a black matrix layer provided around the color filter layer or the color conversion layer provided on the surface on the opposite side of the translucent sealing substrate. In an organic electroluminescence display device having a structure in which a sealing panel is bonded with a photocurable resin, an opening for introducing ultraviolet rays for curing the photocurable resin is formed in the black matrix layer. It is characterized by.

  According to a more limited aspect of the present invention, a driving circuit for driving each pixel is provided on a substrate, a first electrode is provided for each pixel on the driving circuit, and the space between the first electrodes is covered. An organic layer formed by sequentially laminating an organic layer including a light emitting layer, a light-transmitting second electrode, and a protective film on the first electrode and the pixel separation film. An EL element panel and a sealing panel disposed opposite to a protective film of the organic EL element panel, the color filter layer or the color conversion layer provided corresponding to each pixel, and the color filter layer or the color conversion In an organic EL display device having a structure in which a black matrix layer provided around a layer is bonded to a sealing panel provided on an opposite surface of a light-transmitting sealing substrate with a photocurable resin , Curing photo-curing resin on black matrix layer It is characterized in that openings for introducing ultraviolet light to is formed.

  According to the present invention, since the opening for introducing ultraviolet rays is formed in the black matrix layer, the matrix layer is bonded to the organic EL element panel and the sealing panel via the photocurable resin. Ultraviolet rays can be introduced into the inside from the openings, and the photocurable resin can be sufficiently cured.

  The black matrix layer is provided in a boundary region between the pixels, and a pixel separation film is present below the black matrix layer. In this region, an organic EL element constituting each pixel. Therefore, the organic EL element is not directly irradiated with ultraviolet rays, and deterioration of the organic EL elements due to ultraviolet rays can be prevented.

  In the organic EL display device of the present invention, since the opening is provided in the matrix layer, there is a possibility that light emitted from the organic EL element leaks to the outside from the opening. Further, in a bright place, light enters from the outside through the opening and is reflected by the metal electrode provided on the substrate of the organic EL element panel, which may reduce the contrast of the display image.

  The light guided through the organic EL element is incident on the surface of the pixel separation film. When the light incident on the surface of the pixel separation film is totally reflected, the reflected light is reflected along the inclined surface that is the side surface of the pixel separation film. Therefore, in order to prevent such reflected light from being emitted from the opening of the black matrix layer, it is preferable to provide the opening of the black matrix layer so as not to be positioned on the extended line of the side surface of the pixel separation film.

  Further, a blue filter that transmits the wavelengths in the ultraviolet region and the blue region and cuts the wavelengths in the green region and the red region may be provided in the opening of the black matrix layer. By providing such a blue filter, it is possible to transmit ultraviolet rays, but it is possible to prevent the light emitted from the organic EL element or the reflected light from the metal electrode from being transmitted. Emission can be suppressed.

  Further, the organic EL display device of the present invention can be a display device having a red pixel region, a green pixel region, and a blue pixel region, and a red color filter layer corresponding to the red pixel, a green pixel as the color filter layer. And a blue color filter layer corresponding to a blue pixel may be provided. In this case, an opening color filter made of the same material as the blue color filter layer or the red color filter layer may be provided in the opening of the black matrix layer instead of the blue filter.

  When such an opening color filter is provided, a blue color filter layer or a red color filter layer made of the same material as the opening color filter is formed from a positive resist material, and the opening color filter is formed. It is preferable that the film thickness of the color filter for openings is made thinner than the film thickness of the blue color filter layer or the red color filter layer by adjusting the exposure amount. By reducing the film thickness of the color filter for openings, it is possible to increase the amount of transmitted ultraviolet light that is irradiated when the photocurable resin is cured.

In the present invention, when the refractive index of the organic layer of the organic EL element panel is n1, the refractive index of the pixel separation film is n2, and the angle between the side surface of the pixel separation film and the surface direction of the substrate is θ, the angle θ Preferably, the pixel separation film is formed so as to satisfy the following formula.
asin (n2 / n1) −asin (n2 / n1sin (90 ° −θ)) ≦ 35 °

  By forming the pixel separation film so as to satisfy the above formula, the light emitted from the organic EL element and reflected by the side surface of the pixel separation film can be prevented from leaking outside through the opening of the black matrix layer. it can.

  In the present invention, the refractive index of the organic layer of the organic EL element panel is preferably different from the refractive index of the pixel separation film, and the difference between the refractive index of the organic layer and the refractive index of the pixel separation film is increased. Thus, it is possible to reduce leakage of light reflected from the side surface of the pixel separation film from the pixels of the black matrix layer to the outside.

  In addition, the amount of light reflected from the side surface of the pixel separation film can be reduced by forming the pixel separation film from a black light-absorbing material, and light is emitted from the opening of the black matrix layer to the outside. Leakage can be reduced.

  In the method for producing an organic EL display device of the present invention, an organic EL element panel and a sealing panel are bonded to each other through a photocurable resin, and then an ultraviolet ray is irradiated to the opening of the black matrix layer to form the photocurable resin. It is characterized by curing.

  According to the manufacturing method of the present invention, ultraviolet rays can be irradiated inside from the opening of the black matrix layer, so that when the organic EL element panel and the sealing panel are bonded together, photocuring that becomes an adhesive of these Can be cured sufficiently.

  The organic EL display device of the present invention is a top emission type organic EL display device, and light is extracted from the side opposite to the substrate on which the drive circuit is provided. Therefore, the substrate may be a translucent substrate or a non-translucent substrate.

  The drive circuit provided on the substrate may be an active matrix circuit using a thin film transistor (TFT), for example, or may be a passive matrix circuit.

  On the driving circuit, a first electrode is provided for each pixel. For example, an anode can be formed as the first electrode. As a material for the anode, a highly reflective metal electrode (aluminum, silver, molybdenum, tungsten or an alloy thereof) is formed, and a transparent and high work function indium tin oxide (ITO) or indium zinc is formed thereon. A transparent conductive film such as an oxide (IZO) is preferably formed to serve as the anode.

In the present invention, an organic layer including a light emitting layer and a light-transmitting second electrode are formed on the first electrode. When the first electrode is an anode and the second electrode is a cathode, examples of the organic EL element structure composed of an organic layer including a light emitting layer include the following.
(1) Anode / organic EL light emitting layer / cathode (2) Anode / hole injection layer / organic EL light emitting layer / cathode (3) Anode / organic EL light emitting layer / electron injection layer / cathode (4) Anode / hole injection Layer / organic EL light emitting layer / electron injection layer / cathode (5) anode / hole injection layer / hole transport layer / organic EL light emitting layer / electron injection layer / cathode (6) anode / hole injection layer / hole transport Layer / organic EL light emitting layer / electron transport layer / electron injection layer / cathode

  The organic EL light emitting layer is not particularly limited as long as it can be used as a light emitting material for an organic EL element. In the case where the red pixel (R), the green pixel (G), and the blue pixel (B) are provided, an organic EL light emitting layer that emits white light may be used. In this case, for example, a blue light-emitting layer may be stacked on an orange light-emitting layer to form an organic EL light-emitting layer that emits white light.

  The hole injection layer, the hole transport layer, the electron transport layer, and the electron injection layer can be formed from, for example, a hole transport material and a hole transport material that are conventionally used in organic EL devices.

  The light-transmitting second electrode can be formed from a transparent conductive film such as ITO or IZO, a metal thin film such as silver or gold, and a laminated structure film of these transparent conductive films.

  A protective film is stacked over the light-transmitting second electrode. The protective film is formed so as to cover the entire organic EL element so that the organic EL element is not deteriorated by moisture or the like entering from the outside. As the protective film, those having electrical insulating properties and barrier properties against moisture, low molecular components and the like are preferable. Further, the transparency in the visible light region is preferably high, and the transmittance is preferably 50% or more in the range of 400 to 800 nm.

  Examples of the material for such a protective film include inorganic oxides and inorganic nitrides such as SiOx, SiNx, SiNxOy, AlOx, TiOx, TaOx, and ZnOx.

  As a method for forming the protective film, it can be formed by sputtering, CVD, vacuum deposition, or the like. In addition, a method such as a dip method can be used if there is no direct influence on the element. The structure of the protective film is a single layer or a laminated structure using a plurality of materials, and in the laminated structure, a laminated body of an inorganic material and an organic material or a laminated body of one or more different inorganic materials may be used. Good.

  In the present invention, the organic EL element panel and the sealing panel are bonded together via a photocurable resin. Examples of the photocurable resin include a resin curable by ultraviolet rays and a resin curable by ultraviolet rays and heat. Examples of such photo-curing resins include various acrylates such as ester acrylate, urethane acrylate, epoxy acrylate, melamine acrylate, and acrylic resin acrylate, radical photo-curing adhesives using resins such as urethane polyester, epoxy, vinyl ether, and the like. And cationic photo-curing adhesives using these resins.

  In the present invention, a color filter layer or a color conversion layer and a black matrix layer provided around the color filter layer or the color conversion layer are coated on the sealing panel provided on the translucent sealing substrate. After that, it is superposed on the organic EL element panel, and the photocurable resin is cured by irradiating ultraviolet rays in this state. Specifically, each of the organic EL element panel and the sealing panel is placed in a vacuum chamber, and each is set with a holder. Then, the inside of the vacuum chamber is sealed, the exhaust valve is opened, and the inside of the chamber is set to 1 to 10 Pa pressure. Reduce pressure. After positioning the positions of the respective panels, one holder is lowered, the holders are overlapped with each other, are aligned again, and are bonded together. After the bonding is completed, the vacuum in the chamber is broken, the chamber is opened, the bonded organic EL element panel and the sealing panel are taken out, and the photocurable resin is cured by irradiating them with ultraviolet rays under predetermined conditions. Further, in the case of a heat combined photocurable resin, a heat treatment is also performed.

  According to the present invention, in an organic EL display device having a structure in which an organic EL element panel and a sealing panel are bonded together with a photocurable resin, deterioration of the organic EL element due to ultraviolet rays irradiated to cure the photocurable resin is prevented. In addition, an organic EL display device in which the photocurable resin is sufficiently cured can be obtained.

  In the present invention, since the opening provided for irradiating ultraviolet rays is formed in the black matrix layer, when the organic EL display device emits light for display, there is little light leakage from the opening. The contrast in the display can be kept good.

  According to the method for producing an organic EL display device of the present invention, the organic EL element is prevented from being deteriorated by ultraviolet rays, the photocurable resin is sufficiently cured, and the organic EL element panel and the sealing panel are firmly bonded. Can do.

  Hereinafter, the present invention will be described with reference to specific examples, but the present invention is not limited to the following examples.

(Examples 1-3)
FIG. 1 is a cross-sectional view showing an organic EL display device of one embodiment according to the present invention.

  As shown in FIG. 1, a drive circuit 2 made of a thin film transistor (TFT) is provided on a substrate 1 made of glass or the like. A planarizing film 3 is formed on the drive circuit 2. On the planarization film 3, an anode 4 is formed for each pixel. The anode 4 has a structure in which a reflective metal and a transparent conductive film are laminated. A reflective metal such as Ag, Mo, Cr, Al, and Au and an alloy thereof were used as the reflective electrode, and an inorganic oxide such as ITO, IZO, and ZnO was used as the transparent conductive film.

  In the organic EL display device of the present embodiment, a red pixel region (R), a green pixel region (G), and a blue pixel region (B) are formed. The anode 4 of each pixel is electrically connected to the electrode of the drive circuit 2 through the through hole.

  A pixel separation film 5 is formed in a region between the pixels so as to cover between the anodes 4. The pixel separation film can be formed from a thermoplastic resin, a thermosetting resin, a photocurable resin, or the like, but is preferably formed from a thermosetting resin or a photocurable resin. Examples of the photocurable resin include a resin having a reactive vinyl group such as an acrylate resin, a methacrylate resin, a polyimide resin, a polyepoxy resin, a polyvinyl cinnamate resin, and a cyclized rubber. In this embodiment, it is made of polyimide having a refractive index of 1.58. Further, the angle formed with respect to the substrate surface direction of the side surface 5a of the pixel isolation film 5 is 45 °.

  A hole injection layer is formed on the entire region so as to cover the anode 4 and the pixel isolation film 5. The hole injection layer is made of, for example, fluorocarbon (CFx) having a thickness of 1 nm.

  A hole transport layer and an orange light emitting layer are sequentially formed on the hole injection layer. The hole transport layer is formed of, for example, a triarylamine derivative, and here, NPB (N, N'-Di (naphthalene-1-yl) -N, N'- represented by the formula (1) having a thickness of 60 nm is used. diphenyl benzidine).

  The orange light emitting layer has a configuration in which a host material is doped with a first dopant and a second dopant. The orange light emitting layer has a thickness of 30 nm, for example.

  As the host material for the orange light emitting layer, for example, the same NPB as the material for the hole transport layer can be used.

  As the first dopant of the orange light emitting layer, for example, tBuDPN (5,12-Bis (4-tert-butylphenyl) naphthathene) represented by the formula (2) can be used. The first dopant is doped so as to be 20% by weight with respect to the orange light emitting layer.

  As the second dopant of the orange light emitting layer, for example, DBzR (5,12-Bis (4- (6-methylbenzothiazol-2-yl) phenyl) -6,11-diphenylnaphthacene) represented by the formula (3) is used. be able to. This second dopant is doped so as to be 3% by weight with respect to the orange light emitting layer.

  The second dopant in the orange light-emitting layer emits light, and the first dopant has both the highest occupied molecular orbital (HOMO) level and the lowest unoccupied molecular orbital (LUMO) level between the host material and the second dopant. Therefore, it plays a role of assisting light emission of the second dopant by promoting energy transfer from the host material to the second dopant. Thereby, the orange light emitting layer generates orange light having a peak wavelength larger than 500 nm and smaller than 650 nm.

  Next, a blue light emitting layer is formed on the orange light emitting layer. The blue light emitting layer has a configuration in which a host material is doped with a first dopant and a second dopant. Note that the blue light emitting layer has a thickness of, for example, 40 nm.

  As a host material of the blue light emitting layer, for example, TBADN (2-tert Butyl-9,10-di (2-naphthyl) anthracene) represented by Formula (4) can be used.

  As the first dopant of the blue light emitting layer, for example, NPB which is the same as the material of the hole transport layer can be used. The first dopant is doped so as to be 10% by weight with respect to the blue light emitting layer.

  As a 2nd dopant of a blue light emitting layer, TBP (1,4,7,10-Tetra-tert butyl perylene) shown by Formula (5) can be used, for example. The second dopant is doped so as to be 2.5% by weight with respect to the blue light emitting layer.

  The second dopant of the blue light-emitting layer emits light, and the first dopant is made of a hole transporting material, and promotes carrier recombination in the blue light-emitting layer by promoting hole transport. It plays the role which assists light emission of two dopants. Thereby, the blue light emitting layer generates blue light having a peak wavelength larger than 400 nm and smaller than 500 nm.

  Next, an electron transport layer, an electron injection layer, and a cathode 7 are formed on the blue light emitting layer.

  The electron transport layer is made of, for example, Alq3 (Tris (8-hydroxyquinolinato) aluminum) represented by Formula (6) having a thickness of 10 nm.

  The electron injection layer is made of, for example, lithium (Li) having a thickness of 1 nm, and the cathode 7 is made of, for example, silver (Ag) having a thickness of 20 nm and IZO as an auxiliary electrode having a thickness of 200 nm formed thereon, for example. A layered structure was formed. A protective film 8 made of SiNx is formed on the cathode 7.

  On the protective film 8, a sealing panel is attached via a photocurable resin layer 9.

  The sealing panel is configured by providing a color filter layer 11 on a translucent sealing substrate 10 such as glass. The color filter layer 11 is formed on the organic EL element panel side. As the color filter layer 11, a red color filter layer 11R corresponding to a red pixel, a green color filter layer 11G corresponding to a green pixel, and a blue color filter layer 11B corresponding to a blue pixel are provided. A black matrix layer 12 is formed in an area between the pixels around the color filter layer 11. The black matrix layer 12 is located above the pixel separation film 5.

  In this embodiment, the color filter layer 11 is manufactured using a photosensitive film (resist film) containing a pigment. After the resist films are bonded together using a laminator, exposure is performed using a mask alignment exposure device so as to form a pattern of each color filter layer, and thereafter development is performed with an alkaline aqueous solution to remove unnecessary portions. For example, the color filter layers are formed in the order of red, green, and blue, respectively.

  Similarly to the color filter layer 11, the black matrix layer 12 is formed by laminating a resist film for black matrix, then exposing and developing.

  As shown in FIG. 1, openings 13 are formed in the black matrix layer 12. The opening 13 can be formed by exposing a portion corresponding to the opening during exposure.

  The thickness of the color filter layer 11 is 2.5 μm, and the thickness of the black matrix layer 12 is 1.5 μm.

  In the first embodiment, as shown in FIG. 6, the opening 13 is formed in a square shape of 4 μm × 4 μm at a position where the black matrix layer 12 formed in a lattice shape intersects.

  The photocurable resin layer 9 has the organic EL element panel and the sealing panel bonded together so that the thickest part is 6 μm and the thinnest part is 5 μm.

  In the second embodiment, as shown in FIG. 7, the opening 13 is formed in a stripe shape having a width of 4 μm.

  In the third embodiment, as shown in FIG. 8, the openings 13 are formed so as to have a lattice shape with a width of 4 μm.

  The opening 13 in the present invention can be formed in various shapes. For example, the opening 13 having a shape as shown in FIGS. 9, 10, and 11 may be formed.

Example 4
FIG. 2 is a cross-sectional view showing an organic EL display device of Example 4 according to the present invention. As shown in FIG. 2, in this embodiment, a blue filter 14 is provided in the opening 13 of the matrix layer 12 of the sealing panel. The blue filter 14 is a filter that transmits wavelengths in the ultraviolet region and blue region and cuts wavelengths in the green region and red region. By forming the blue filter 14 in the opening 13, it is possible to reduce the light emitted from the light emitting layer of the organic EL element from being emitted to the outside through the opening. Therefore, light leakage can be prevented and a good display contrast can be maintained.

(Example 5)
FIG. 3 is a sectional view showing an organic EL display device of Example 5 according to the present invention.

  As shown in FIG. 3, in this embodiment, the red color filter 11 </ b> R or the blue color filter 11 </ b> B is provided as an opening color filter in the opening 13 of the black matrix layer 12. These color filters for openings are formed to be thinner than the color filter layer provided in the pixel region. This is for making it easy to transmit ultraviolet rays by reducing the thickness.

  As described above, the color filter layer is formed using a positive resist film. However, when forming a filter for an opening, the film thickness can be increased by increasing the exposure amount in this portion. It is thin.

  By providing an opening color filter in the opening 13, it is possible to prevent light emitted from the light emitting layer of the organic EL element from leaking to the outside or light reflected by the reflective electrode from leaking to the outside. .

(Examples 6 to 8)
In Examples 6 to 8, the angle θ of the pixel separation film 5 with respect to the substrate surface direction is changed from 45 ° in Example 1 to 75 ° (Example 6), 60 ° (Example 7), and 30 ° (Example). An organic EL display device was produced in the same manner as in Example 1 except that the change was made to Example 8).

  12 and 13 are schematic diagrams for explaining the relationship between the angle of incident light, reflected light, and transmitted light when light emitted from the light emitting layer of the organic EL element enters the pixel separation film in the display device. is there. 12 and 13, the refractive index of the organic layer 6 is n1, the refractive index of the pixel separation film 5 is n2, and the inclination angle of the side surface 5a of the pixel separation film 5 with respect to the surface direction of the substrate is θ. Further, θc indicates a total reflection angle at which total reflection occurs when incident on the inclined surface 5a.

  FIG. 12 shows a state when light from the organic layer 6 is incident on the inclined surface 5a from above, and FIG. 12 (a) is incident within an incident angle range of 90−θc. FIG. 12B shows the state when the incident angle is within the range of θc−θ ′, and FIG. 12C shows the state where the incident angle is within the range of θ ′. The state when it is incident is shown.

  FIG. 13 shows a state in which light from the organic layer 6 is incident from below relative to the inclined surface 5a. FIG. 13D shows a state when the incident angle is θ ′, and FIG. 13E shows a state when the incident angle is in the range of θc−θ ′. (F) has shown the state when an incident angle is in the range of 90-thetac.

As described above, the total reflection angle θc indicates the incident angle at which the light incident on the inclined surface 5a is totally reflected.
θc = asin (n2 / n1).

Further, the angle θ ′ at which the light transmitted through the pixel separation film 5 is emitted in the horizontal direction is as follows.
θ ′ = asin (n2 / n1sin (90 ° −θ))

  As shown in FIG. 12, when light is incident on the inclined surface 5a from above, the reflected light reflected by the inclined surface 5a and the transmitted light transmitted through the inclined surface 5a both travel downward. There is no leakage from the opening.

As shown in FIG. 13D, the incident angle θ is
0 <θ <asin (n2 / n1sin (90 ° −θ))
In this case, the light incident on the inclined surface 5a becomes transmitted light, but the transmitted light is radiated to the inside of the substrate, so that no light is radiated to the outside.

As shown in FIG. 13 (e), the incident angle θ is
asin (n2 / n1sin (90 ° −θ)) <θ <asin (n2 / n1)
At this time, part of the incident light on the inclined surface 5a propagates through the transmitted light and the pixel separation film 5, and the other light is reflected by the inclined surface 5a and travels upward. Therefore, these lights pass through the opening 13.

As shown in FIG. 13 (f), the incident angle θ is
asin (n2 / n1) <θ
At this time, the reflected light totally reflected by the inclined surface 5a is emitted toward the opening side from the opening.

  As described above, the incident angle with respect to the inclined surface 5a that is the side surface of the pixel separation film 5 affects whether or not the light emitted from the organic layer of the organic EL element is emitted to the outside through the opening. Since light is emitted from the organic layer 6 at various angles, the inclination angle of the side surface 5a of the pixel separation film 5 affects how much light leaks from the opening to the outside. In this embodiment, the inclination angle 45 ° in the first embodiment is changed to 75 °, 50 °, and 30 °, and the influence of the inclination angle is examined. The film thickness of the photocurable adhesive layer is 5 μm (Example 6), 5 μm (Example 7), and 2 μm (Example 8). In Example 1, the thickness is 5 μm.

Example 9
In this example, an organic EL display device was produced in the same manner as in Example 1 except that the pixel separation film 5 was formed of an acrylic resin having a refractive index of 1.49. Since the refractive index of the organic layer is 1.8, by using an acrylic resin having a refractive index of 1.49, the refractive index difference with the organic layer can be increased compared with Example 1, and the external portion can be opened from the opening. Can be reduced.

(Example 10)
FIG. 4 is a schematic diagram showing an organic EL display device of Example 10 according to the present invention.

  As shown in FIG. 4, in this embodiment, a black pixel separation film 5 is formed as the pixel separation film 5. Such a black pixel separation film 5 can be formed by containing a black pigment such as carbon particles in the resin forming the pixel separation film.

  Further, as shown in FIG. 5, the pixel separation film 5 may be formed from a laminated structure of color filter layers. In the embodiment shown in FIG. 5, the pixel separation film 5 is formed by laminating a red color filter layer 11R, a green color filter layer 11G, and a blue color filter layer 11B in this order.

(Comparative Example 1)
In Example 1, an organic EL display device was produced in the same manner as in Example 1 except that the opening 13 was not formed.

[Evaluation of organic EL display devices]
The following points were evaluated for each of the produced organic EL display devices.

<Curing state of photocurable resin layer>
After the organic EL element panel and the sealing panel were bonded together, the photocurable resin layer was cured by irradiation with ultraviolet rays, and the cured state after curing was evaluated. After curing the photo-curable resin, use a sharp knife or other sharp tool to peel off the organic EL element panel and the sealing panel, and whether the exposed photo-curable adhesive layer is cured or not evaluated. The cured product was evaluated as 〇, and the semi-solid state, gel state, and liquid state were evaluated as ×.

<Color leakage from the opening>
The organic EL display device was caused to emit light, and the evaluation was made based on whether or not there was leakage of the emission color from the opening. The case where the emission color leakage was recognized was set as “Yes”, and the case where the emission color was not recognized was set as “None”.

<Measurement of contrast ratio>
The contrast was calculated from the following equation by measuring the display surface brightness of the panel and the display surface brightness when no light was emitted in a bright place.

Contrast = Front brightness of light emitting panel / Front brightness of non-light emitting panel The above evaluation results are shown in Table 1.

  In Table 1, “filter” indicates that the filter provided at the opening is “present”, and “filter” is not present.

  The “opening pattern” indicates the pattern shape of the opening. □ indicates a square shape.

  “Pixel separation film” indicates whether the pixel separation film is transparent or black.

  “Angle” indicates an angle of the side surface of the pixel separation film with respect to the substrate surface.

  “N1” indicates the refractive index of the organic layer, and “n2” indicates the refractive index of the pixel separation film.

  “Θc−θ ′” indicates asin (n2 / n1) −asin (n2 / n1sin (90 ° −θ)).

  As is apparent from the results shown in Table 1, it can be seen that in Examples 1 to 10 according to the present invention, the cured state of the photocurable resin layer is better than that of Comparative Example 1. Therefore, the photocurable resin can be sufficiently cured by providing an opening in the black matrix layer according to the present invention.

  As is clear from the comparison of Examples 1 to 3, the contrast ratio changes depending on the shape of the opening. This is considered to be one of the causes due to reflection by TFTs or wirings formed on the substrate. Therefore, a decrease in contrast can be suppressed by not disposing a reflective material such as a TFT or wiring on the substrate located in the opening. As is clear from Examples 4 and 5, the contrast ratio can be increased by providing a filter in the opening.

  As is clear from Example 10, the contrast ratio can be increased by coloring the pixel separation film to form a light-absorbing pixel separation film.

  Further, as is apparent from the result of θc−θ ′, it is understood that when this value is 35 ° or less, color leakage from the opening is eliminated, and this value is preferably 35 ° or less.

Sectional drawing which shows the organic electroluminescent display of one Example according to this invention. Sectional drawing which shows the organic electroluminescence display of Example 4 according to this invention. Sectional drawing which shows the organic electroluminescence display of Example 5 according to this invention. Sectional drawing which shows the organic electroluminescence display of Example 10 according to this invention. Sectional drawing which shows the organic electroluminescence display of the other Example according to this invention. The top view which shows the shape of the black-matrix layer and opening part in the organic electroluminescence display of Example 1 according to this invention. The top view which shows the shape of the black matrix layer and opening part in the organic electroluminescence display of Example 2 according to this invention. The top view which shows the shape of the black-matrix layer and opening part in the organic electroluminescence display of Example 3 according to this invention. The top view which shows the other example of the black matrix part in this invention, and an opening part. The top view which shows the other example of the black matrix part in this invention, and an opening part. The top view which shows the other example of the black matrix part in this invention, and an opening part. The schematic diagram which shows the relationship between the incident light to a pixel separation film, reflected light, and transmitted light. The schematic diagram which shows the relationship between the incident light to a pixel separation film, reflected light, and transmitted light.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Drive circuit 3 ... Flattening film 4 ... Anode 5 ... Pixel separation film 5a ... Side surface of pixel separation film 6 ... Organic layer 7 ... Cathode 8 ... Protective film 9 ... Photocurable resin layer 10 ... Sealing substrate DESCRIPTION OF SYMBOLS 11 ... Color filter layer 11R ... Red color filter layer 11G ... Green color filter layer 11B ... Blue color filter layer 12 ... Black matrix layer 13 ... Opening part of black matrix layer 14 ... Blue filter

Claims (11)

  1. An organic EL element panel in which a plurality of organic EL elements are disposed on a main surface of a substrate, and a sealing panel disposed to face the main surface side of the organic EL element panel, A corresponding color filter layer or color conversion layer and a black matrix layer provided around the color filter layer or color conversion layer are provided on the opposite surface of the light-transmitting sealing substrate. The stop panel,
    In an organic electroluminescence display device having a structure bonded with a photocurable resin,
    An organic electroluminescence display device, wherein an opening for introducing an ultraviolet ray for curing the photocurable resin is formed in the black matrix layer.
  2. A driving circuit for driving each pixel is provided on the substrate, a first electrode is provided for each pixel on the driving circuit, a pixel separation film is formed so as to cover the space between the first electrodes, An organic EL element panel formed by sequentially laminating an organic layer including a light emitting layer, a translucent second electrode, and a protective film on the first electrode and the pixel separation film;
    A sealing panel disposed opposite to the protective film of the organic EL element panel, the color filter layer or color conversion layer provided corresponding to each pixel, and the periphery of the color filter layer or color conversion layer A black matrix layer provided on the sealing panel provided on the opposite surface of the translucent sealing substrate;
    In an organic electroluminescence display device having a structure bonded with a photocurable resin,
    An organic electroluminescence display device, wherein an opening for introducing an ultraviolet ray for curing the photocurable resin is formed in the black matrix layer.
  3.   3. The organic electroluminescence display device according to claim 1, wherein the opening of the black matrix layer is provided so as not to be positioned on an extension line of a side surface of the pixel separation film.
  4.   4. The blue filter that transmits ultraviolet and blue wavelengths and cuts green and red wavelengths is provided in the opening of the black matrix layer. 2. The organic electroluminescence display device according to claim 1.
  5.   The red color filter layer corresponding to the red pixel, the green color filter layer corresponding to the green pixel, and the blue color filter layer corresponding to the blue pixel are provided as the color filter layer. 4. The organic electroluminescence display device according to any one of 3 above.
  6.   6. The organic electroluminescence according to claim 5, wherein a color filter for an opening made of the same material as that of the blue color filter layer or the red color filter layer is provided in the opening of the black matrix layer. Display device.
  7.   By forming the blue color filter layer or the red color filter layer made of the same material as the color filter for opening from a positive resist material, and adjusting the light transmission amount when forming the color filter for opening The organic electroluminescence display device according to claim 6, wherein a film thickness of the color filter for the opening is made thinner than a film thickness of the blue color filter layer or the red color filter layer.
  8. When the refractive index of the organic layer of the organic EL element panel is n1, the refractive index of the pixel separation film is n2, and the angle formed by the side surface of the pixel separation film with respect to the surface direction of the substrate is θ. The organic electroluminescence display device according to claim 2, wherein the pixel separation film is formed so that θ satisfies the following expression.
    asin (n2 / n1) −asin (n2 / n1sin (90 ° −θ)) ≦ 35 °
  9.   The organic electroluminescence display device according to claim 2, wherein a refractive index of the organic layer of the organic EL element panel is different from a refractive index of the pixel separation film.
  10.   The organic electroluminescence display device according to claim 2, wherein the pixel separation film is formed of a black light-absorbing material.
  11. A method for manufacturing the organic electroluminescence display device according to claim 1,
    The organic EL element panel and the sealing panel are bonded to each other via the photocurable resin, and then the photocurable resin is cured by irradiating the opening of the black matrix layer with ultraviolet rays. A method for producing an organic electroluminescence display device.

JP2005287558A 2005-09-30 2005-09-30 Organic electroluminescent display device and its manufacturing method Withdrawn JP2007103027A (en)

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