JP2008235089A - Organic el display panel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL display panel of the top emission structure having a structure completely sealing with a resin based filler a laminated structural part of an organic EL light-emitting element, and also to provide its manufacturing method. <P>SOLUTION: In the organic EL display panel of the top emission structure, a rib structure is installed between a screen display region of a color filter element and the outer peripheral sealing material, and the space between the organic EL light-emitting element and the color filter element is filled with the resin based filler. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an organic electroluminescence (hereinafter referred to as “organic EL”) display panel. More specifically, the light emission surface of an organic EL light emitting element and the light incident surface of a color filter element are opposed to each other while maintaining a certain distance. In particular, the present invention relates to an organic EL display panel having a top emission structure in which outer peripheries of an organic EL light emitting element and a color filter element are sealed with a peripheral sealing material, and a manufacturing method thereof.

  A panel unit of an organic EL display is known to have a top emission structure and a bottom emission structure. For a panel unit having a bottom emission structure manufactured by stacking an organic EL light emitting element on a color filter element. A panel unit having a top emission structure is manufactured by aligning and finally bonding individually manufactured organic EL light emitting elements and color filter elements.

  FIG. 12 is a cross-sectional view schematically showing the main part of a panel unit having a top emission structure. As shown in FIG. 12, the organic EL light-emitting element 1 and the color filter element 2 are laminated structures of both elements for preventing the organic EL light-emitting element 1 and the color filter element 2 from coming into contact with the outside air. The outer surface sealing material 3 provided on the outer periphery of the organic EL light-emitting element is usually bonded to the light emitting surface of the organic EL light-emitting element by adjusting the height of the outer peripheral sealing material 3 and, if necessary, the spacer 6 provided for each pixel. And the light incident surface of the color filter element are kept at a constant distance.

  As a means for more complete sealing of the laminated structure portion of the organic EL light emitting element and the color filter element, a method of adjusting the oxygen concentration and moisture concentration of the sealing region (Patent Documents 1 and 2), Filling with an inert gas such as nitrogen gas (Patent Document 3), enclosing an inert liquid such as liquid crystal (Patent Document 2), and a resin filler such as a higher viscosity resin adhesive (Patent Documents 4, 5, 6, and 7) are known.

  While the refractive index of the transparent electrode layer constituting the light emitting surface of the organic EL light emitting element is around 2.0, the refractive index of the light incident surface of the color filter element is around 1.5, whereas a gas such as nitrogen is used. The refractive index of the liquid crystal is limited to about 1.0, and the refractive index of the inert liquid is limited to about 1.3. Therefore, the light extraction efficiency from the organic EL light emitting element is lowered due to the interface reflection at these boundary surfaces. On the other hand, epoxy adhesives and the like have a high refractive index of 1.5 or more after curing, and by using these as fillers, it can be expected that the efficiency of extracting light from the organic EL light emitting device will be improved. In addition, it is advantageous in terms of mechanical strength.

  Generally, these resin-based adhesives have a viscosity of about 1 to 100 Pa · s, which is higher than that of liquid fillers such as liquid crystals, and spread when an organic EL light emitting element and a color filter element are bonded. Unfortunately, a simple resin-based filler dripping and bonding as shown in FIGS. 10 and 11 does not spread to every corner inside the outer peripheral sealing material, and even in the case of a panel of about 2 to 3 inches, There is often the possibility of poor filling that is not partially filled with filler.

  In addition, when the resin filler is dropped from a high-precision quantitative discharge device using a screw valve, a jet dispenser, or the like, bubbles are easily caught by a mechanical operation unit. Further, bubbles are easily formed even when the irregularities on the element surface are covered at high speed, and the bubbles adhere to the element surface. In particular, when the spacer 6 is provided in the pixel, it is difficult for the generated bubbles to flow outward. The generated bubbles are not easily removed due to the high viscosity even when they are bonded together under vacuum, and the bubbles remaining in the screen region cause uneven brightness.

As a means to completely fill the entire sealing region with the resin-based filler, the resin is spread along the discontinuous outer peripheral sealing material including the gap material, and an opening provided with an excess resin filler in the outer peripheral sealing material A method of protruding from the outer peripheral sealing material (Patent Document 4), and a method of providing a protective wall between the outer peripheral sealing material and the electrode region in order to prevent contamination of the electrode region by the resin filler protruding beyond the outer peripheral sealing material ( Patent Document 5), a method (Patent Document 6) and the like in which a first substrate in which a resin adhesive is disposed in a central region and a second substrate warped on a convex surface are bonded to each other have been proposed.
JP 11-045778 A JP 2001-093664 A JP 2000-068049 A JP 2004-207234 A JP 2003-178866 A Japanese Patent Laid-Open No. 11-283737 JP 2004-103534 A

  Although the method of making the said filler protrude from the opening part provided in the outer periphery sealing material (patent document 4) can fill the whole screen easily, on the other hand, the process of the protruded filler is difficult. For example, in the case of a multi-panel substrate, a sufficient interval between adjacent panels must be provided, and the number of panels per substrate is limited. In addition, it is required to use a thermosetting resin as the filler, and when the thermosetting is carried out with a part of the filler protruding from the outer peripheral sealing material, the filler expands and flows before curing. Contaminating parts and causing poor conduction.

  In the method of providing a protective wall between the outer peripheral sealing material and the electrode part (Patent Document 5), even if the electrode part can be prevented from being contaminated by the filler protruding from the outer peripheral sealing material, the filler is bonded with high viscosity. In the case of the agent, the problem that the resin does not spread uniformly inside the outer peripheral sealing material and the problem of entrainment of bubbles cannot be solved. Furthermore, in the method in which the substrates are warped and bonded together (Patent Document 6), the substrate is required to have strength that does not break even if the substrate is warped on the convex surface. Is difficult to adopt.

  The present invention relates to an organic EL display panel having a top emission structure having a structure that allows a resin filler to be completely filled in a gap between an organic EL light emitting element and a color filter element without entraining air bubbles, and manufacturing the same. It aims to provide a method.

  As a result of diligent research to achieve the above object, the present inventors have provided a rib structure that guides the flow of the resin filler between the pixel region of the organic EL light emitting element and the outer peripheral sealing material. The inventors have found that at least the entire screen display area can be completely filled with the resin-based filler, thereby completing the present invention.

  The organic EL display panel of the present invention has a light emitting surface of an organic EL light emitting element and a light incident surface of a color filter element facing each other while maintaining a certain distance, and the outer periphery of the organic EL light emitting element and the color filter element is sealed. An organic EL display panel having a top emission structure sealed with a rib structure provided between a screen display region of the color filter element and an outer peripheral sealing material, and the organic EL light emitting element and the color filter A resin filler is filled between the elements.

  The rib structure may be a continuous structure or a structure with four discontinuous corners, and further, between the screen display region of the color filter element and the outer periphery sealing agent, Multiple rows may be provided.

  The method for producing an organic EL display panel of the present invention is such that the light emitting surface of the organic EL light emitting element and the light incident surface of the color filter element are opposed to each other while maintaining a certain distance so that the outer periphery of the organic EL light emitting element and the color filter element is A method of manufacturing an organic EL display panel having a top emission structure formed by sealing with a sealing material, the step of forming a continuous or discontinuous rib structure along the outer periphery of the screen display region of the color filter element, A step of forming a continuous outer peripheral sealing material layer along an outer periphery of the rib structure, a step of arranging a resin filler on the color filter element, and aligning the color filter element and the organic EL light emitting element Then, after bonding under vacuum, returning to atmospheric pressure, pressure bonding the color filter layer and the organic EL light emitting element, irradiating the outer peripheral sealing material layer with ultraviolet rays And heating step of temporarily curing the outer peripheral sealing material layer, and the panel, characterized in that it comprises a step, to completely cure the resin filler and the outer peripheral sealing material.

  The method may further include a step of dividing the peripheral sealing material layer into individual panels after temporary curing.

  In the above method, the step of arranging the resin filler on the color filter element may be a step of quantitatively dropping the resin filler or a step of applying a constant amount.

  In the present invention, a rib structure as a spacer is provided on the outer periphery of the screen display area of the color filter element and inside the outer peripheral sealing material, so that the organic EL light emitting element and the color filter element are bonded together. The resin-based filler disposed on the color filter element is spread without being blocked in the pixel, so that bubbles are less likely to remain in the screen display area.

  Further, when a plurality of rib structures are provided, the flow rate of the resin filler is controlled in the longitudinal direction along the rib structures, so that the probability that the screen display area is completely filled is improved. A space that tends to remain at the end can be pushed out of the screen display area.

In addition, since the rib structure is provided during the production, the amount of the filler dropped or applied may be sufficient to fill the inside of the rib structure, and the inside of the outer peripheral sealing material is completely filled. Since filling is not required, it is possible to use a filler discharging apparatus that is not highly accurate. This makes it possible to select a filler discharge device that is difficult for air bubbles to enter, such as air pressure control + syringe dispenser, and as a result, eliminates air bubbles in the screen display area.
Furthermore, after preliminarily curing the outer peripheral sealing material, it is divided into individual panels, and the resin-based filler and the outer peripheral sealing material are heat-cured, so that even if a seal failure occurs where the filler leaks, The influence on the panel without a mark can be reduced.

  The present invention will be described based on FIGS. 1 to 9 showing an embodiment of the present invention.

  1 is a cross-sectional structure of an organic EL display panel, FIG. 2 is a plan view of an organic EL light emitting element, FIG. 3 is a plan view of a color filter element, and FIG. 4 is a schematic diagram showing a detailed structure of an end portion of the organic EL display panel. It is.

  FIGS. 5 to 7 are arrangement diagrams of resin fillers representing patterns of rib structures provided in the color filter elements and modes of arranging resin fillers on the color filter elements, respectively. FIG. 9 is a schematic diagram showing a multi-planar configuration of the organic EL display panel, and FIG. 9 is a schematic view showing the extended state of the resin filler when the organic EL light emitting element is bonded to the arranged color filter element.

  FIGS. 10 and 11 are schematic views showing an extended state of the resin filler when the organic EL light emitting element is bonded to the color filter element in which the resin filler is arranged by a conventional method, and FIG. 12 is a conventional organic EL display panel. It is a schematic diagram showing the cross-sectional structure.

  The organic EL panel unit having the top emission structure of the present invention includes the organic EL light emitting element 1 shown in FIG. 2 and the color filter element 2 shown in FIG. Then, as shown in FIG. 1, the light exit surface corresponding to the pixel region A of the organic EL light emitting element 1 and the light incident surface corresponding to the screen display region B of the color filter element 2 are opposed to each other through the rib structure 4. It has a basic structure in which the outer periphery of the organic EL light emitting element 1 and the color filter element 2 is sealed with the outer peripheral sealing material 3 while maintaining a constant interval. The rib structure 4 is provided between the screen display region B of the color filter element 2 and the outer periphery sealing material 3, and in a space defined by the organic EL light emitting element 1, the color filter element 2 and the outer periphery sealing material 3. A resin filler 5 is filled. In addition, in order to maintain the space | interval of the organic EL light emitting element 1 and the color filter element 2, you may provide a spacer as needed.

  The organic EL panel unit can be manufactured by the following method.

  As shown in FIG. 3, a rib structure 4 that is continuous or discontinuous along the outer periphery of the screen display region B of the color filter element 2 and surrounds the stacked structure portion of the organic EL light emitting element 1, and the rib structure 4 layers of the outer peripheral sealing material are formed along the outer periphery of 4.

  Next, as shown in FIGS. 5 to 7, the resin filler 5 is disposed on the upper surface of the color filter element 2 by employing a dropping method or a coating method, and the screen display region B of the color filter element 2 and the organic EL light emitting element 1 are arranged. If necessary, the pixel region A is aligned through a spacer and bonded under vacuum, and then returned to atmospheric pressure, the organic EL light-emitting element 1 and the color filter element 2 are pressure-bonded, and the resin filler 5 As shown in FIG. 8, it is extended and filled in the space defined by the organic EL light emitting element 1, the color filter element 2, and the rib structure 4.

  Next, the outer peripheral sealing material 3 layers are irradiated with ultraviolet rays to be temporarily cured, and in the case of taking a plurality of panels as shown in FIG. 9, after dividing into each panel, each panel is heated to form a resin filler. 5 and the outer peripheral sealing material 3 are completely cured.

  In the present invention, the rib structure 4 is a structure having a rib width of 10 to 20 μm that is disposed along the outer periphery of the screen display region B of the color filter element 2 that surrounds the stacked structure portion of the organic EL light emitting element 1. .

  The rib structure 4 may be continuous as shown in FIG. 5 or may be discontinuous as shown in FIGS. In addition, in FIGS. 3 to 8, three rows of rib structures are provided in parallel, but one or two rows may be provided, and more rows may be provided. 3-5 rows of parallel rib structures with at least four corners being discontinuous are preferred.

  As shown in FIGS. 3, 6, and 7, by forming the rib structure 4 having at least four corners that are discontinuous, when the resin filler 5 is extended, as shown in FIG. The flow to the four corners of the rib structure 4 is promoted, and generation of unfilled portions C at the four corners of the screen display region B as shown in FIG. 10 can be prevented.

  Further, by providing a plurality of rows of rib structures 4, the flow along each of the plurality of rows of rib structures 4 of the resin filler 5 is promoted as shown in FIG. 8 when the resin filler 5 is extended. Thus, the generation of the unfilled portion C between the stacked structure portion of the organic EL light emitting element 1 and the sealing material 3 as shown in FIG. 11 can be prevented. When the rib structures 4 are provided in multiple layers, the interval between the rib structures 4 is usually in the range of 100 to 300 μm.

  Photosensitive resin is usually used for the rib structure 4 and the outer peripheral sealing material 3, and each is formed by a known method such as a photolithography method.

  In the present invention, the resin filler 5 disposed on the color filter element 2 is adhered to and spreads on the surface of the resin filler 5 by bonding the organic EL light emitting element 1 to the color filter element 2. Such a thermosetting resin is used. The uncured viscosity of the thermosetting resin is 0.1 Pa · s to 100 Pa · s, but the uncured viscosity is preferably 0.2 Pa · s to 10 Pa · s, more preferably 1 Pa · s to A 10 Pa · s thermosetting resin is used.

  When the uncured viscosity of the resin-based filler 5 is less than 0.2 Pa · s, the formation of the unfilled portion can be eliminated relatively easily, but there are cases where the moisture barrier property of the cured resin is insufficient, and sealing is performed. It may be insufficient. On the other hand, when the viscosity at the time of uncuring exceeds 10 Pa · s, filling failure such as generation of unfilled portions and residual bubbles is likely to occur even with the configuration of the present invention.

  Further, the resin filler 5 preferably has a refractive index of 1.3 to 2 after curing and a light transmittance of 50% or more at a wavelength of 400 to 800 nm. Examples of such resin filler 5 include various resin adhesives such as epoxy resin, silicon, and fluororesin.

  The amount of the resin filler 5 disposed on the color filter element 2 exceeds the space volume defined by the organic EL light emitting element 1, the color filter element 2, and the rib structure 4, and the organic EL light emitting element 1, the color filter element 2 and the space volume defined by the outer peripheral sealing material 3. The space defined by the organic EL light-emitting element 1, the color filter element 2 and the rib structure 4 is filled with the resin-based filler 5, whereby the resin-based filler 5 in the laminated structure portion of the organic EL light-emitting element 1. A complete seal is achieved.

  The resin filler 5 is disposed on the color filter element 2 by a central dropping method as shown in FIG. 5, a multi-point dispersion dropping method as shown in FIG. 6, or a linear coating method as shown in FIG. Either can be adopted. These are appropriately selected depending on the screen size and shape, but since the resin filler 5 tends to spread along the inner wall of the rib structure 4, there is a special drop position or application position of the resin filler 5. There is no limit. In the case of a screen size of about 2 to 3 inches, one point drop at the center is sufficient.

  As described above, the dropping method and the coating method of the resin-based filler 5 have a margin in the quantitative accuracy of the filler as compared with the conventional method, so that not only the high-precision quantitative discharge device but also the discharge accuracy is about 10%. However, it is possible to employ a method of discharging from a syringe with a pneumatically controlled dispenser that does not involve bubbles.

  After arranging the resin filler 5 on the color filter element 2, the color filter element 2 and the organic EL light emitting element 1 are usually bonded together under a vacuum of 50 Pa or less, and then returned to atmospheric pressure. The color filter element 2 and the organic EL light emitting element 1 are pressure-bonded.

  A part of the resin filler 5 disposed on the color filter element 2 by bonding and pressure bonding between the color filter element 2 and the organic EL light emitting element 1 is the inner wall of the rib structure 4 as shown in FIG. The remaining portion extends beyond the rib structure 4 and fills the inside of the outer peripheral sealing material 3.

  By bonding the color filter element 2 and the organic EL light emitting element 1 under vacuum, air bubbles are efficiently discharged out of the space defined by the organic EL light emitting element 1, the color filter element 2, and the rib structure 4. Is done. In particular, by making the rib structure 4 in which the four corners where bubbles tend to stagnate are discontinuous, the discharge of the bubbles to the outside of the rib structure 4 is promoted, and the resin-based filling of the laminated structure portion of the organic EL light emitting element 1 is facilitated. Complete coverage with agent 5 is achieved.

  By returning the system to atmospheric pressure, the organic EL light emitting element 1 is pressure-bonded to the color filter element 2, and then the outer peripheral sealing material 3 layer is irradiated with ultraviolet rays to temporarily cure the outer peripheral sealing material 3, FIG. As shown in FIG. 2, when the panel unit is multi-chamfered, it is divided into each panel unit.

  At this stage, the filling failure of the resin filler 5 of each panel unit is checked, the panel unit without filling failure is heat-treated, and the resin filler 5 and the outer peripheral sealing material 3 are completely cured.

  In the present invention, the organic EL light-emitting element 1 constituting the panel unit of the top emission structure may be either an active matrix type or a passive matrix type, and the active matrix type panel unit is as shown in FIG. Substrate 10, base layer 11 including a TFT structure formed on substrate 10 and a planarizing resin layer covering it, insulating film 12 and reflective electrode 13 patterned on base layer 11, insulating film and reflection Organic EL light-emitting layer 14 composed of a stack of a plurality of organic layers including an organic light-emitting layer on electrode 13, transparent electrode 15 patterned on organic EL light-emitting layer 14, wiring for connecting transparent electrode 15 and the control terminal The barrier layer 16 that covers the entire surface of the pixel portion is usually configured.

  As shown in FIG. 4, the color filter element 2 constituting one of the panel units having the top emission structure includes a transparent substrate 20 such as a glass substrate, and a black matrix layer 21 and a color patterned on the transparent substrate 20. In the case of the multi-color system and the full-color system, the color conversion layer 23, the black matrix layer 21, and the color conversion layer 23 are provided on the color filter layer 22. Further, in consideration of the fluidity and outgas of the resin filler, a polymer flattening layer and a passivation layer covering the polymer flattening layer may be provided on the color conversion layer 23.

  The invention is explained in more detail by means of examples.

[Organic EL light emitting device 1]
On the alkali-free glass substrate 10 having a thickness of 200 mm × 200 mm × 0.7 mm, a plurality of TFTs as shown in FIG. 4 and a SiO ₂ passivation film having a thickness of 300 nm are formed on a planarizing resin covering the TFTs. An IZO film with a thickness of 50 nm is sputter-deposited in an Ar gas atmosphere using an RF-planar magnetron, and a resist agent (OFRP-800, trade name, manufactured by Tokyo Ohka Kogyo Co., Ltd.) is applied, and exposure and development are performed. Then, the base pattern 11 separated into islands for each subpixel was formed by wet etching. This base pattern was connected to the TFT by contact holes provided in the planarization layer and the passivation layer.

  Next, an Ag film having a thickness of 200 nm was formed on the base pattern 11 by sputtering, and the reflective electrode 13 was formed by patterning into an island shape by the same method so as not to protrude from the base pattern 11.

  A 1 μm novolak resin (JEM-700R2: trade name, manufactured by JSR) is applied on the reflective electrode 13 by a spin coating method, and the organic insulating film 12 is opened so as to open a window at a portion (pixel) that emits light by a photolithographic method. Formed.

Next, the substrate is mounted in a resistance heating device, Li having a thickness of 1.5 nm is deposited on the reflective electrode 13, a cathode buffer layer is formed, and the internal pressure of the vacuum layer is reduced to 1 × 10 ⁻⁴ Pa. While maintaining this, an electron transport layer, an organic EL light emitting layer, a hole transport layer, and a hole injection layer were sequentially laminated to form an organic EL layer 14. Each layer was laminated at a deposition rate of 0.1 nm / sec.

Tris (8-hydroquinolinato) aluminum (Alq ₃ ) with a thickness of 20 nm as an electron transport layer, and 4,4′-bis (2,2′-diphenylvinyl) biphenyl (DPVBi) with a thickness of 30 nm as an organic EL light emitting layer 4,4 ′-[N- (1-naphthyl) -N-phenylamino] biphenyl (α-NPD) having a thickness of 10 nm as a hole transport layer, and copper phthalocyanine (CuPc) having a thickness of 100 nm as a hole injection layer ) Was laminated.

  Next, MgAg 50 nm was vapor-deposited as a damage mitigating layer when the transparent electrode 15 was formed on the organic EL layer 14 by sputtering, and moved to the counter sputtering apparatus without breaking the vacuum, and IZO was formed as the transparent electrode 15 with a thickness of 100 nm. For the film formation of MgAg and IZO, a metal mask having a square window opened at a position corresponding to the display portion of a plurality of units was used. Furthermore, it was moved to a CVD apparatus without breaking the vacuum, and SiN as a barrier layer 16 was entirely coated to a thickness of 2 μm to obtain the organic EL light emitting device 1.

[Color filter element 2]
Photolithograph of black matrix (CK-7001, manufactured by Fuji Film ARCH) 21 corresponding to a plurality of units as shown in FIG. 9 on non-alkali glass (1737: manufactured by Corning) having a thickness of 200 mm × 200 mm × 0.7 mm. Formed by the method.

  Next, between the patterns of the black matrix 21, the thickness of red (CR-7001, manufactured by Fuji Film ARCH), green (CG-7001, manufactured by Fuji Film ARCH) and blue (CB-7001, manufactured by Fuji Film ARCH) is about 2 μm. The strip-shaped color filter 22 was formed by a photolithographic method.

  Next, a color conversion layer 23 having a thickness of about 10 μm was formed using the same photomask as the color filter. As a coating solution, 25 g of photoresist (V259PAP5: manufactured by Nippon Steel Chemical Co., Ltd.), 0.05 g of coumarin 6 for the green conversion layer, 0.04 g of rhodamine B and coumarin 6 for the red conversion layer 0.05 g was added and used. In addition, since the emission spectrum of the organic EL light-emitting element 1 is blue to blue-green (400 nm to 550 nm), a transparent acrylic resin was used for the blue conversion layer.

  Next, as shown in FIG. 4, on the black matrix 21 on the outer periphery of the color filter pattern, a rib structure (CR-600: Hitachi Chemical Co., Ltd.) having a discontinuous four corners and having four corners discontinuous by photolithography. Kogyo Co., Ltd.) 3 was formed in triplicate at intervals of 180 μm to obtain a color filter element 2.

  As shown in FIG. 4, the rib structure 4 is formed at a position outside the take-out portion 17 of the transparent electrode (anode) 15 of the organic EL light emitting device 1 and in contact with the passivation layer 16. It may be provided closer to the screen area.

[Organic EL display panel]
The color filter element 2 obtained above is moved to a bonding apparatus in which the oxygen concentration is controlled to 5 ppm or less and the water concentration is 5 ppm or less, and the color filter element 2 is set with the light incident surface facing upward. Epoxy UV curable adhesive (viscosity: about 130 Pa · s, XNR5516: manufactured by Nagase ChemteX Corporation) is applied to each outer periphery of the screen using a dispenser to form three layers of outer peripheral sealing material, and screen display area A thermosetting epoxy adhesive (viscosity: about 2 Pa · s) having a viscosity lower than that of the outer peripheral sealing material layer 3 is dropped as a resin filler 5 in the vicinity of the center using an air pressure control + syringe dispenser system. (FIG. 9). The viscosity of the epoxy ultraviolet curable adhesive and the thermosetting epoxy adhesive is a value measured using a rotary viscometer in an environment of 25 ° C. and 1 atm.

  Next, the light emitting surface of the organic EL light-emitting device 1 obtained as described above is set face down and opposed to the light incident surface of the color filter device 2, and the inside of the apparatus is reduced to about 10 Pa to reduce the distance between the two devices. Is adjusted to approximately 20 μm, and the pixel positions of both elements are aligned by an alignment mechanism, and then the pressure inside the apparatus is returned to atmospheric pressure by applying a slight load between the two elements and crimping. The load application was stopped at a position where the upper end was in contact with the organic EL light emitting device 1. At this time, the upper ends of the three layers of the outer peripheral sealing material were in close contact with the glass substrate 10 of the organic EL light emitting device 1.

    The resin filler 5 dripped onto the color filter element 2 during the pressure bonding between the two elements, along the inner wall of the rib structure 4 as shown in FIG. It spreads over the entire surface and was completely filled inside the rib structure 4.

  Next, the outer peripheral sealing agent 3 layer part is irradiated with ultraviolet rays from the glass substrate 20 side of the color filter element 2 to temporarily cure the outer peripheral sealing material 3 layer, taken out to the general environment, and an automatic glass scriber and breaker are installed. Used and divided into individual panel units. Filling failure due to entrainment of bubbles of the resin filler 5 of each divided panel unit, insufficient filling, excessive filling, etc. was zero.

  The divided individual panel units were placed in a heating furnace at a sufficient interval, heated at 80 ° C. for 1 hour, and naturally cooled in the furnace for 30 minutes and taken out.

  Next, each panel unit is put into a dry etching apparatus, the barrier layer covering the wiring part 18, the terminal part 19 and the IC connection pad is removed, and the terminal part is exposed so that it can be connected to a flexible printed circuit board or the like. The organic EL display panel of the present invention was obtained.

The schematic diagram which shows the cross-section of the organic electroluminescence display panel of this invention. The schematic diagram which shows the planar structure of the organic electroluminescent light emitting element which comprises the organic electroluminescent display panel of this invention. The schematic diagram which shows the planar structure of the color filter element which comprises the organic electroluminescent display panel of this invention. The schematic diagram which shows the cross-section edge part structure of an organic electroluminescence display panel. The aspect figure of the pattern of a rib structure, and the center dripping of the resin filler. FIG. 3 is a diagram illustrating an embodiment of dispersion dropping of a resin filler. The aspect diagram of linear application | coating of a resin filler. The schematic diagram which shows the extended state of the resin filler by bonding of both elements and pressure bonding. Explanatory drawing of multiple chamfering of a plurality of panels. The schematic diagram which shows the spreading | diffusion state of the resin filler by bonding of both elements by conventional technology, and crimping | compression-bonding. The schematic diagram which shows the spreading | diffusion state of the resin filler by bonding of both elements by conventional technology, and crimping | compression-bonding. The schematic diagram which shows the cross-section of the conventional organic EL display panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Organic EL light emitting element 10 Substrate of organic EL light emitting element 11 Underlayer including TFT structure 12 Insulating layer 13 Reflective electrode (cathode)
14 Organic EL layer 15 Transparent electrode (anode)
DESCRIPTION OF SYMBOLS 16 Passivation layer 17 Anode extraction part 18 Wiring 19 Terminal 2 Color filter element 20 Color filter element substrate 21 Black matrix 22 Color filter 23 Color conversion layer 3 Peripheral sealing material 4 Rib structure 5 Resin filler 6 Spacer 7 Vacuum state A space area maintained in A A pixel area of an organic EL light emitting element B Screen display area of a color filter element C Space area not filled with a filler

Claims (13)

A top emission structure in which the light emission surface of the organic EL light emitting element and the light incident surface of the color filter element are opposed to each other while maintaining a certain distance, and the outer periphery of the organic EL light emitting element and the color filter element is sealed with a sealing material An organic EL display panel
A rib structure is provided between the screen display region of the color filter element and the outer peripheral sealing material, and a resin filler is filled between the organic EL light emitting element and the color filter element. Organic EL display panel.   The organic EL display panel according to claim 1, wherein the rib structure is a continuous rib structure.   The organic EL display panel according to claim 1, wherein the rib structure is a rib structure having at least four corners that are discontinuous.   The organic EL display panel according to claim 1, wherein the rib structures are provided in a plurality of rows.   The organic EL display panel according to claim 1, wherein the rib structure has a width of 10 to 20 μm.   The organic EL display panel according to claim 4, wherein an interval between the plurality of rows of rib structures is 100 to 300 μm.   The organic EL display panel according to claim 1, wherein the resin filler is a transparent thermosetting adhesive.   The organic EL display panel according to claim 1, wherein the resin filler has a viscosity of 0.2 Pa · s to 10 Pa · s. A top emission structure in which the light emitting surface of the organic EL light emitting element and the light incident surface of the color filter element are opposed to each other while maintaining a certain distance, and the outer periphery of the organic EL light emitting element and the color filter element is sealed with a sealing material. An organic EL display panel manufacturing method,
Forming a continuous or discontinuous rib structure along the outer periphery of the screen display area of the color filter element;
Forming a continuous outer peripheral sealing material layer along the outer periphery of the rib structure;
Arranging a resin filler on the color filter element;
A step of aligning the color filter element and the organic EL light emitting element and bonding them together under vacuum, and then pressure bonding the color filter layer and the organic EL light emitting element by returning to atmospheric pressure;
Irradiating the outer peripheral sealing material layer with ultraviolet rays, preliminarily curing the outer peripheral sealing material layer, and heating the panel to completely cure the resin filler and the outer peripheral sealing material;
A method for producing an organic EL display panel, comprising:   The method for manufacturing an organic EL display panel according to claim 9, further comprising a step of dividing the peripheral sealing material layer into individual panels after temporary curing.   The method for producing an organic EL display panel according to claim 9 or 10, wherein the step of arranging the resin filler on the color filter element is a step of dropping a resin filler in a fixed amount.   The method for producing an organic EL display panel according to claim 9 or 10, wherein the step of arranging the resin filler on the color filter element is a step of applying the resin filler quantitatively.   When the color filter element and the organic EL light emitting element are bonded to each other so that the filling amount of the resin filler is equal to or larger than the volume formed inside the rib structure, and inside the outer peripheral sealing material It is below the volume formed, The manufacturing method of the organic electroluminescent display panel as described in any one of Claim 9 thru | or 12 characterized by the above-mentioned.

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