JP2013157328A - Organic electroluminescent element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL module which reduces the number of the manufacturing processes and improves the yield.SOLUTION: An organic EL module 10 includes: a display electrode 16 sealed between a substrate 13 and a sealing substrate 14; an organic EL element 19 including a luminous layer 17 and a back electrode 18; a lead-out terminal 31 electrically connected with at least one of the display electrode 16 and the back electrode 18 at a periphery of the sealing substrate 14; a driving IC 12 disposed at the substrate opposite side of the sealing substrate 14; wire bonding wiring 32 electrically connecting the lead-out terminal 31 with the driving IC 12; a flexible wiring board electrically connected with the driving IC 12; and a resin part MR where at least the wire bonding wiring 32 may be embedded. One side of the resin part MR is cut out so that the flexible wiring board is led out.

Description

  The present invention relates to a display module, and more particularly to an organic electroluminescence (EL) module and a method for manufacturing the same.

  Conventionally, as a large display system apparatus, it has been proposed that a plurality of small display modules as a unit are attached to each other in a matrix form by tiling to constitute one large display apparatus. The production of a large display device with a single large glass plate has a high cost for investment in advanced technology and production line, but the tiled configuration of the small display module can be used for the current production line. It is effective in that the hurdle is lowered.

  In general, in the case of a tiled configuration of a small display module, a gap region is inevitably generated between the display regions (also referred to as light emitting regions) of the small display modules adjacent to each other. It becomes easy to be recognized and it is difficult to realize a satisfactory image display. That is, in the case of a display device made by joining a plurality of display modules, the joint portion where the display modules are joined becomes conspicuous. This is because each display module has a so-called gap region that is not related to display around the display region, and this gap region is continuous at the joint portion of the organic EL module.

  For example, in a matrix array of display devices, by using wire bonding to provide electrical connection to the active area of the display to components on the display backplate in order to reduce the gap area between the display devices There has been proposed a method for reducing a protruding region and a gap region between display devices in an interconnected matrix array (see Patent Document 1). Furthermore, a width of 1.5 mm or less, for example, a width of 0.0001 to 1.25 mm, has been proposed with the gap region as a reduced protruding portion (for example, a wire bond region or an electrical connection region) of a small display module. .

  In addition, although it is known to use a wire bond for electrical connection inside a sealing can of a display module such as an oil immersion type EL display panel (see Patent Documents 2 and 3), the gap region width between display modules Is directly linked to the display image quality, so further reduction of the gap region width is important even if wire bonding is used.

JP 2006-099093 A JP 63-019795 A JP 07-093195

  As described above, the area from the edge of the light emitting area to the non-light emitting edge of the panel (for example, the four sides of the display module) (hereinafter referred to as a frame) is narrowed, that is, a gap area reduction technique (hereinafter referred to as a narrow frame). Is called for in the display market. For example, small and medium-sized organic EL modules for mobile phones or digital cameras are strongly required to be thin and have a narrow frame, and the inside of the device is also required to have a structure suitable for it. However, although the module as shown in Patent Document 1 is required to have a reduced protruding portion width of less than 1 mm, the width of the non-light emitting sealing ring (sealing margin region) that defines the active region is 1.3 to There is also 1.5mm, and it cannot be said that a narrow frame can be secured.

  On the other hand, in a matrix array process in which a plurality of general display modules are arranged, a process of combining each module is required, and a complicated process of disposing adhesive means such as a double-sided tape between the frames of the modules is necessary. Or manufacturing takes a long time. In addition, the frame of the module (for example, the wire bond region or the electrical connection region of the reduced bulge portion referred to in Patent Document 1) is damaged in the assembly apparatus during the assembly process, or depending on the shape of the frame, the glass transparent substrate In some cases, the assembler may be damaged by cracks or chips. Furthermore, narrowing the frame has a problem of reducing the strength of the frame itself and the sealing performance of the organic EL panel. The organic EL panel is damaged during transportation or installation of the organic EL module due to a decrease in the frame strength. The possibility of shortening is increased.

  In particular, the breakage of the wire bond region requires replacement of the module, so that the process of combining is greatly delayed and the yield is reduced.

  This invention makes it an example of a subject to cope with such a problem. That is, an example of an object of the present invention is to provide an organic EL module that can be manufactured in a short time without performing complicated steps, and can improve the yield by suppressing the number of manufacturing steps, and the like. It is.

The method of manufacturing an organic EL module according to the present invention includes a light emitting region in which an organic EL element including a display electrode, a light emitting layer, and a back electrode is disposed and is sealed between the main surfaces of a translucent substrate and a sealing substrate. An organic EL panel having an extraction terminal around the light emitting region, and a driving IC disposed on the main surface of the sealing substrate on the side opposite to the light-transmitting substrate and controlling the organic EL element via the extraction terminal An organic EL module manufacturing method comprising:
The driving IC is disposed on the main surface of the sealing substrate opposite to the light transmitting substrate, and the lead terminal connected to the display electrode and the back electrode is connected to the sealing substrate side main surface of the light transmitting substrate from the light emitting region. An organic EL panel forming step of forming the organic EL panel so as to be exposed above;
A wire bonding step of electrically connecting the lead terminal and the driving IC by wiring by wire bonding; and
Resin that embeds and hardens the wiring, the driving IC, and the sealing substrate with a resin in a fluid state, and forms a resin portion having a side surface in which the cured resin surface is flush with the side surface of the translucent substrate Part forming step.

  In the method for manufacturing an organic EL module according to the present invention, the organic EL panel forming step includes a mother light-transmitting substrate and a mother sealing substrate each having a plurality of areas of the light-transmitting substrate and the sealing substrate. Forming an adhesive body fixed by an adhesive means that is supplied in a sealing margin region having a predetermined width surrounding the light emitting region and delimits the space without covering the exposed extraction terminal and the dividing region; And cutting the mother sealing substrate at least in the dividing region to divide the sealing substrate into a plurality of the sealing substrates on the mother light-transmitting substrate.

  In the method for manufacturing an organic EL module according to the present invention, the mother EL substrate is cut at the dividing region, and the organic EL module is composed of a sealing substrate and a transparent substrate each bonded by the bonding means. And a step of dividing the panel into a plurality of pieces.

  Specifically, the present invention is a method of manufacturing an organic EL module in which an organic EL panel and a driving IC that controls display of the organic EL panel are mounted as one module, and includes the following steps that are sequentially performed as an example. .

  As the organic EL panel forming step, pretreatment (a step of forming a display electrode and a lead terminal of an anode (or cathode) of an organic EL element on one mother light-transmitting substrate); film formation (light emission on the display electrode) Forming an organic EL layer including a layer (which may be vapor deposition, coating, or printing); forming a back electrode (forming a counter electrode (cathode (or anode)) of a display electrode on the organic EL layer); sealing Stopping (step of sealing and joining the mother light-transmitting substrate and the mother sealing substrate by an adhesive means); dividing (step of dividing into pieces of the mother light-transmitting substrate for each organic EL panel) is sequentially performed.

  After the organic EL panel forming step, a mounting step (a step of forming a driving IC for driving the organic EL panel on the sealing substrate) is performed.

  After the mounting step, a wire bonding step (a step of electrically connecting the lead terminal on the light-transmitting substrate and the driving IC on the back surface of the sealing substrate by wire bonding) is performed.

  After the wire bonding step, a resin molding step (a step of placing an organic EL panel in a mold and filling and curing a fluid resin so as to embed a wire bond) is performed. As a result, a resin portion having a side surface that is flush with the side surface of the translucent substrate is formed.

  That is, in the method for manufacturing an organic EL module according to the present invention, in the resin part forming step, the organic EL panel is placed in a mold that defines a cavity for forming the resin part, and the resin is used as the mold. The organic EL panel can be released from the mold by filling and curing.

  In the method for manufacturing an organic EL module according to the present invention, the mold can define a cavity such that a part or all of the surface of the drive IC is exposed from a part of the resin part.

  As a further specific example, the present invention is a method for manufacturing an organic EL module in which an organic EL panel and a driving IC for controlling the organic EL panel are mounted as one module, and the following steps can be sequentially performed.

  As the organic EL panel forming step, pretreatment (a step of forming a display electrode and a lead terminal of an anode (or cathode) of an organic EL element on one mother light-transmitting substrate); film formation (light emission on the display electrode) Forming an organic EL layer including a layer (which may be vapor deposition, coating, or printing); forming a back electrode (forming a counter electrode (cathode (or anode)) of a display electrode on the organic EL layer); sealing Stop (step of sealing and bonding the mother light-transmitting substrate and the mother sealing substrate by an adhesive means); groove formation (step of dividing only the mother sealing substrate on the mother light-transmitting substrate into a plurality of sealing substrates); Do.

  After the organic EL panel forming step, a mounting step (a step of forming a driving IC for driving the organic EL panel on the sealing substrate) is performed.

  After the mounting step, a wire bonding step (step of electrically connecting the lead terminals on the mother light-transmitting substrate and the driving IC on the back surface of the sealing substrate by wire bonding) is performed.

  After the wire bonding step, a resin molding step (a step of filling and hardening a flowable resin so as to embed a wire bond in at least a groove between the sealing substrates on the mother translucent substrate) is performed.

  After the resin molding step, an organic EL module dividing step (step of dividing the cured resin and the mother light-transmitting substrate with a scriber) is performed. As a result, a resin portion having a side surface that is flush with the side surface of the translucent substrate is formed.

  That is, in the method for producing an organic EL module according to the present invention, in the resin part forming step, the gap between the sealing substrates on the mother light-transmitting substrate is covered with at least the wiring and the extraction terminal. After the resin is applied and cured, the mother translucent substrate together with the cured resin is cut at the dividing region, and each of the organic layers is composed of a sealing substrate and a translucent substrate that are bonded by the bonding means. And a step of dividing the EL panel into a plurality of pieces, and by cutting, a side surface that is flush with a side surface of the light-transmitting substrate on the cured resin surface can be formed. In other words, in this example, the step of dividing the sealing substrate into a plurality of steps forms a groove that does not reach the mother light-transmitting substrate of the sticking body (half cut), and fills the groove with resin. Curing to form a resin layer, and cutting the resin layer with a width narrower than the groove (full cut), the resin layer is provided on the side surface of the sealing substrate so as to be flush with the side surface of the translucent substrate And a process.

  In the method for manufacturing an organic EL module according to the present invention, in the resin part forming step, the mother translucent substrate is formed with a cavity in which a part or all of the surface of the drive IC is exposed from a part of the resin part. It can be carried out in a formwork to be defined.

  In the method for manufacturing an organic EL module according to the present invention, the organic EL panel forming step may include a step of forming the driving IC on the sealing substrate in a chip-on-glass form.

Furthermore, the organic EL module according to the present invention is an organic EL module manufactured by the above-described organic EL module manufacturing method,
A light-transmitting substrate; a sealing substrate; a light-emitting region in which at least one organic EL element including a display electrode, a light-emitting layer, and a back electrode is disposed between the light-transmitting substrate and the main surface of the sealing substrate by an adhesive means; And an organic EL panel having an extraction terminal electrically connected to the display electrode and the back electrode, respectively, and disposed around the light emitting region;
A driving IC disposed on the main surface of the organic EL panel opposite to the light-transmitting substrate of the sealing substrate;
Wiring by wire bonding for electrically connecting the drive IC and the lead terminal;
The wiring portion, the driving IC, and the sealing substrate are embedded, and the resin portion has a side surface that is flush with the side surface of the translucent substrate. In other words, the organic EL module includes a light-transmitting substrate on which an organic EL element of a light emitting unit is formed and transmits outgoing light, and a seal that is attached to the organic EL element by an adhesive unit and hermetically seals the organic EL element. The wire bonding wiring from the lead terminal at the edge of the translucent substrate around the sealing substrate, that is, the frame portion, to the drive IC on the sealing substrate is embedded in the resin portion that is flush with the sealing substrate. Features.

  According to the present invention, in the organic EL module using wire bonding with the driving IC, since the wire bonding wiring is embedded in the resin portion, the above-described problems can be solved and the reliability of the organic EL panel is ensured. A narrow frame can be realized.

  By realizing such a narrow frame, a display device in which a plurality of organic EL modules are tiled can be realized.

  In particular, according to the organic EL module according to the present invention, in which the side surface of the light-transmitting substrate and the side surface of the resin portion are flush with each other, when incorporated in a display device (electronic device such as a mobile phone or an in-vehicle acoustic device). This has the effect of simplifying the handling. This is because it is possible to solve the problem that the side end surface of the glass light-transmitting substrate is damaged when it is integrated with the resin portion.

  Furthermore, a part of the drive IC and the resin part covers the back side of the transparent substrate, and in the present invention, there is nothing that covers a part of the display side surface of the transparent substrate, and it is wider without reducing the display area. A display area can be secured.

It is the perspective view seen from the display surface side of the organic electroluminescent module which concerns on embodiment of this invention. It is the perspective view seen from the back side of the organic EL module concerning the embodiment of the present invention. It is a typical schematic fragmentary sectional view of the organic EL module in line AA of FIG. It is a partial top view of the translucent board | substrate of the organic electroluminescent panel in the organic electroluminescent module which concerns on embodiment of this invention. It is a typical schematic perspective view of the mother translucent board | substrate in the organic electroluminescent module manufacturing process (pre-processing process P1) which concerns on embodiment of this invention. It is a typical schematic perspective view of the mother translucent board | substrate in the organic EL module manufacturing process (film-forming process P2) which concerns on embodiment of this invention. It is a typical schematic perspective view of the mother translucent board | substrate in the organic electroluminescent module manufacturing process (back electrode formation process P3) based on embodiment of this invention. It is a typical schematic perspective view of the mother sealing substrate in the organic EL module manufacturing process (sealing process P4) which concerns on embodiment of this invention. It is a typical schematic perspective view of the mother translucent board | substrate in the organic EL module manufacturing process (sealing process P4) which concerns on embodiment of this invention. It is a typical schematic perspective view of the sticking body in the organic EL module manufacturing process (sealing process P4) which concerns on embodiment of this invention. It is a typical schematic perspective view which forms the groove | channel of the width | variety which exposes an extraction terminal in the mother translucent board | substrate in the organic EL module manufacturing process (parting process P5) which concerns on embodiment of this invention. It is a typical schematic perspective view of the mother translucent board | substrate in the organic EL module manufacturing process (parting process P5) based on embodiment of this invention. It is a typical schematic perspective view of the organic electroluminescent panel divided from the mother translucent board | substrate in the organic electroluminescent module manufacturing process (mounting process P6) based on embodiment of this invention. It is a typical schematic perspective view of the organic electroluminescent panel divided from the mother translucent board | substrate in the organic electroluminescent module manufacturing process (wire bonding process P7) which concerns on embodiment of this invention. It is a typical schematic perspective view of the organic electroluminescent panel divided from the mother translucent board | substrate in the organic electroluminescent module manufacturing process (resin shaping | molding process P8) which concerns on embodiment of this invention. It is a typical schematic perspective view of the mother translucent board | substrate in the organic EL module manufacturing process (mounting process P6) which concerns on other embodiment of this invention. It is a typical schematic perspective view of the mother translucent board | substrate in the organic EL module manufacturing process (wire bonding process P7) which concerns on other embodiment of this invention. It is a typical schematic perspective view of the mother translucent board | substrate in the organic EL module manufacturing process (resin shaping | molding process P8) which concerns on other embodiment of this invention. It is a typical schematic perspective view of the organic EL module divided | segmented from the mother translucent board | substrate in the organic EL module manufacturing process (parting process P5 ') based on other embodiment of this invention.

  An organic EL module according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In each figure, the same constituent elements are given the same reference numerals even when they are shown in different figures, and the detailed description thereof is omitted. Furthermore, it is needless to say that the embodiments are merely examples and the present invention is not limited thereto.

<Configuration of organic EL module>
FIG. 1 is a perspective view of an organic EL module 10 according to an embodiment of the present invention as viewed from the display surface side FS. FIG. 2 is a perspective view of the organic EL module 10 according to the embodiment of the present invention as viewed from the back side BS. FIG. 3 is a schematic schematic partial cross-sectional view of the organic EL module 10 taken along line AA in FIG. FIG. 4 is a partial plan view of the light-transmitting substrate 13 of the organic EL panel 11 in the organic EL module 10.

  As shown in the figure, the organic EL module 10 is integrally molded so that the organic EL panel 11, the drive IC 12 and the like adhered and fixed to the back surface thereof, and the side surface of the organic EL panel 11 and the side surface thereof are flush with each other. And the resin part MR. Coplanar means that the organic EL panel 11 shown in FIGS. 1 and 3, in particular, the side surface 11 SF of the translucent substrate 13 and the side surface MRSF of the resin portion MR exist on the same plane.

  As shown in FIG. 2, the back-fixed driving IC 12 of the organic EL panel 11 is connected to a flexible wiring board (also simply referred to as flexi) 12b for electrical connection with the outside. In the organic EL module 10 shown in the figure, the three sides of the organic EL module 10 are flush with the side surfaces of the transparent substrate 13 and the resin part MR, but one side is cut out for the purpose of drawing out the flexi. These four sides are preferably the side surfaces of the flush substrate 13 and the resin part MR. Further, if necessary, an organic EL module with one side or three sides cut out may be used.

  As shown in the cross-sectional view of the organic EL module 10 in FIG. 3, the organic EL panel 11 includes a light-transmitting substrate 13 that is a light-transmitting flat glass and a sealing substrate 14 having a sealing recess. This is an embodiment in which S) is inside and air-tightly bonded through the bonding means 15. A plurality of organic EL elements 19 (light emitting regions 20) each formed by laminating a transparent display electrode 16, an organic EL layer 17, and a back electrode 18 are formed on the inner translucent substrate 13. The sealing substrate 14 has a function of preventing the organic EL element 19 from deterioration factors such as moisture and oxygen. Therefore, drying means 14 b is provided in the recess of the sealing substrate 14. The organic EL panel of the present application uses a plurality of organic EL elements as one pixel, and displays information using light emission / non-light emission of the pixel. The drive IC 12 that controls light emission / non-light emission of the organic EL element 19 is mounted on the sealing substrate 14 side. Further, the necessary wiring EW such as the driving IC 12 and the pad can be directly formed on the sealing substrate 14, but is mounted on the back as a chip on glass (COG) form in which the driving IC 12 is formed together with the necessary wiring on the glass substrate. May be. Since the surface area of the sealing substrate 14 is smaller than the area of the light transmitting substrate 13, an exposed portion having a predetermined width is formed at the edge of the surface of the light transmitting substrate 13.

  As shown in FIG. 4, the organic EL panel may be obtained by patterning organic EL elements 19 on a transparent substrate 13 in the form of a passive drive type dot matrix, or by patterning icons and segments. In the organic EL panel 11, the organic EL element 19 may be disposed as at least one light emitting pixel between the light transmitting substrate 13 and the sealing substrate 14. The organic EL element 19 includes an anode, an organic EL layer including a light emitting layer, and a cathode, and excitons generated in the light emitting layer when a current flows between the anode and the cathode transition from an excited state to a ground state. It is a self-luminous element that utilizes the light emission generated.

  In any case, since the width of the bonding means 15 as an adhesive is as narrow as 0.2 mm, for example, the frame portion of the organic EL module 10 can be narrowed. Further, since a buffer space having a width of 0.1 mm is formed between the bonding unit 15 and the light emitting region 20 on the side where the organic EL modules 10 are joined, the bonding unit 15 as an adhesive flows into the light emitting region 20. Can be prevented. Therefore, even if the organic EL modules 10 are joined together to produce a display device, a display device with high display quality can be provided because the joints between the organic EL modules 10 are not conspicuous.

  A partition wall (not shown) may be formed between the organic EL elements 19 adjacent to each other in the light emitting region 20. The distance between the sealing substrate 14 and the translucent substrate 13 that faces the sealing substrate 14 can be kept constant.

  As shown in FIGS. 1 to 3, the wiring 32 connected to the necessary wiring EW from the driving IC 12 is connected to the lead-out terminal 31 outside the sealing substrate 14 (the display electrode 16 of the organic EL element 19 on the transparent substrate 13). Are connected by wire bonding. The wiring 32 by wire bonding is arranged in a ring shape along the side surface of the peripheral edge of the sealing substrate 14 so as to surround the light emitting region 20 of the organic EL panel 11 between the organic EL panel 11 and the driving IC 12. . In the wiring 32 by wire bonding, the pad (leading terminal 31) on the surface of the translucent substrate 13 and the pad of the driving IC 12 are directly connected. The height of the wiring 32 by wire bonding is not limited. However, in order to increase the adhesive force of the resin portion MR to be filled, it is preferable that the wiring 32 is provided so as to be separated from the translucent substrate 13 to the surface of the sealing substrate 14. . Sealing reinforcement between the translucent substrate 13 and the sealing substrate 14 by the resin portion MR can be achieved.

  The resin part MR constitutes the organic EL module 10 integrally formed by embedding the sealing substrate 14, the drive IC 12, and the wiring 32 by wire bonding with resin. In the present embodiment, the frame portion width W is about 0.5 mm. If the resin part MR has a side surface that is flush with the side surface of the translucent substrate 13, both side surfaces that are flush with each other need not be orthogonal to the panel display surface. When tiling a plurality of modules, a plane can be configured as a single screen display device on one side surface orthogonal to the panel display surface, but a curved surface on one side surface not orthogonal to the panel display surface A screen can be formed.

  Furthermore, the constituent elements of the organic EL module will be described in detail below.

  Although there are Al, Cu, and Au as the wiring 32 by wire bonding, since Al can be used in a room temperature process, it is preferably employed in the organic EL panel 11.

  The resin portion MR includes acrylic materials, epoxy materials, and silicone materials, but it is preferable to employ acrylic materials. This is because heat shrinkage is small and fluidity is good. It is possible to prevent the organic EL panel 11 from being peeled off due to thermal contraction when the resin portion MR is cured.

The display electrode 16 and the back electrode 18 are set on the anode side and the cathode side. The anode side is made of a material having a higher work function than the cathode side, and a transition metal film such as Cr, Mo, Ni, or Pt, or a transparent conductive film such as ITO or IZO is used. Conversely, the cathode side is made of a material having a work function lower than that of the anode side, such as an alkali metal, alkaline earth metal, rare earth metal, etc., a metal having a low work function, a compound thereof, an alloy containing them, a doped polyaniline or a doped material. An amorphous semiconductor such as polyphenylene vinylene or an oxide such as Cr ₂ O ₃ , NiO, or Mn ₂ O ₅ can be used. In contrast to the above embodiment, the display electrode 16 and the back electrode 18 may be set on the cathode side and the anode side.

  The lead-out terminal 31 connected to the display electrode 16 and the back electrode 18 is connected to a drive IC 12 that drives the organic EL panel 11, but is preferably formed as low resistance as possible. As described above, Ag The electrode layer can be laminated with a low-resistance metal such as Cr, Al, or an alloy thereof, or can be formed of these low-resistance metal electrodes alone.

  The organic EL layer 17 includes a single-layer or multilayer film including at least a light-emitting layer, but the layer structure may be formed in any manner. In general, a layer in which a hole transport layer, a light-emitting layer, and an electron transport layer are laminated from the anode side to the cathode side can be used, but the light-emitting layer, the hole transport layer, and the electron transport layer are each one layer. In addition to the hole transport layer and the electron transport layer, either layer may be omitted or both layers may be omitted. It is also possible to insert an organic material layer such as a hole injection layer or an electron injection layer depending on the application. For the hole transport layer, the light emitting layer, and the electron transport layer, conventionally used materials (regardless of polymer materials and low molecular materials) can be appropriately selected and employed. The light-emitting material that forms the light-emitting layer uses either light emission (fluorescence) when returning from the singlet excited state to the ground state or light emission (phosphorescence) when returning from the triplet excited state to the ground state. However, they may be mixed or doped.

  Moreover, you may utilize the airtight sealing method which forms the sealing area | region S with the sealing substrate 14 which has the above recessed parts for sealing, for example, fillers, such as resin and silicone oil, in the sealing area | region S For example, a solid sealing method in which an organic EL element 19 is sealed with a barrier film or the like may be used.

  As the adhesive constituting the adhesion means 15, a thermosetting type, a chemical curing type (two-component mixing), a light (ultraviolet ray) curing type, glass or the like can be used, and acrylic resin, epoxy resin, polyester, polyolefin, etc. are used as materials. Etc. can be used. In particular, it is preferable to use an ultraviolet curable epoxy resin adhesive that does not require heat treatment and has high immediate curing properties.

  The drying means 14b includes a physical adsorption type desiccant such as zeolite, silica gel, carbon and carbon nanotubes, a chemisorption type desiccant such as alkali metal oxide, metal halide and chlorine peroxide, and an organometallic complex in toluene and xylene. It can be formed by a desiccant dissolved in a petroleum solvent such as an aliphatic organic solvent, or a desiccant in which desiccant particles are dispersed in a binder such as polyethylene, polyisoprene, or polyvinyl cinnaate having transparency.

  The organic EL panel 11 according to the embodiment of the present invention may be a single color display or a multi-color display. In order to realize the multi-color display, it is needless to say that a separate coloring method is included. A method in which a color conversion layer using a color filter or a fluorescent material is combined with an organic EL panel 11 having one or a plurality of organic EL elements that emit light of a single color such as white or blue (CF method, CCM method), unit display of two or more colors A method in which regions are stacked vertically to form one unit display region (laminated OLED method), low molecular organic materials with different emission colors are formed on different films in advance and transferred onto a single substrate by laser thermal transfer. A laser transfer method or the like can be employed. In the embodiment, a passive driving method is shown. However, an active driving method is adopted in which a TFT substrate is employed as the light-transmitting substrate 13 and a display electrode 16 is formed on a flattening layer formed thereon. May be adopted.

<First embodiment>
The schematic process of the manufacturing method of the organic EL module 10 which is the 1st Example is demonstrated based on figures.

  In the first embodiment, the following steps are sequentially executed to form a plurality of organic EL panels from a single mother transparent substrate (so-called large glass plate) for the mother transparent substrate, and individual organic EL panels. It is characterized by molding every time.

<Mother translucent substrate side production process>
FIG. 5 is a schematic perspective view of the mother translucent substrate 13M. For example, on the main surface of the mother translucent substrate 13M, the display electrodes 16 such as ITO of the organic EL element and the lead terminals 31 connected to the end portions thereof are formed. A plurality of display electrodes 16 arranged in parallel becomes one array, which becomes a display area through a later process. In this preprocessing process P1, a plurality of arrays are formed in a matrix. As shown in FIG. 5, the array of the display electrodes 16 is arranged with a lattice-like gap including the dividing region DR in the subsequent dividing step. In the figure, it is represented by an array of four rectangular display electrodes 16, but this is a schematic and is not limited to the shape or number.

  Then, in this pretreatment step P1, an insulating film (not shown) having an opening for exposing a portion of the display electrode 16 on the mother transparent substrate 13M where the organic EL element is to be formed is formed.

  Next, as shown in FIG. 6, the organic EL layer 17 is vapor-deposited on the surface of the display electrode 16 (film formation process P2).

  Next, as shown in FIG. 7, a plurality of back electrodes 18 are formed on the organic EL layer 17 (back electrode forming step P3). The back electrode 18 is formed so that each of the plurality of parallel back electrodes 18 is orthogonal to the display electrode 16. In this back electrode forming step P3, the lead terminals 31 connected to the respective ends of the back electrode 18 may be formed, or may be performed simultaneously with the formation of the lead terminals 31 in the pretreatment step P1.

<Mother sealing substrate manufacturing process>
Next, a mother sealing substrate 14M for a plurality of sealing substrates 14 for hermetically sealing the organic EL element 19 as shown in FIG. 8 (a large glass plate having substantially the same size as the mother translucent substrate). Create That is, a plurality of sealing recesses RES (corresponding to the display electrode array or the display region) are formed on the main surface of the mother sealing substrate 14M as shown in FIG. As the material, a plate-like member made of glass, plastic, metal or the like can be used. A glass sealing substrate having a recess for sealing formed by press molding, etching, sandblasting, or the like can be used, or a glass (or plastic) spacer using flat glass. A sealing region is formed between the transparent substrate and the same area as the bonding means. That is, as shown in FIG. 8B, a lattice-shaped gap portion including the dividing region DR used in the subsequent groove forming step can also be formed on the sealing substrate 14 as the dividing recess RES2. The dividing recess RES2 can easily expose the lead-out terminal 31 on the mother translucent substrate 13M without damaging the half-cut.

<Sealing process>
Next, as shown in FIG. 9, the bonding means 15 is supplied to a sealing margin region SMR having a predetermined width that surrounds each light emitting region on the mother translucent substrate 13M. The lead terminals 31 connected to the ends of the display electrode 16 and the back electrode 18 are exposed around the sealing margin region SMR.

  Although not shown in the drawing, an adhesive means may be formed on the sealing substrate side at the edge of the sealing recess in the portion of the lattice-like gap including the dividing region in the subsequent dividing step. That is, the bonding means may be formed on either the mother translucent substrate or the mother sealing substrate.

  Next, as shown in FIG. 10, the mother translucent substrate 13M and the mother sealing substrate 14M with the organic EL elements 19 inside are attached and fixed by pressure bonding to form an adhesive body. When a photosensitive adhesive is used as an adhesive material for the bonding means 15, the bonding may be performed by performing light irradiation from the mother translucent substrate 13 </ b> M side and photocuring the bonding means 15.

  As described above, the mother translucent substrate 13M and the mother sealing substrate 14M are sealed and bonded by the bonding means 15 (sealing step P4).

<Groove formation process>
FIG. 11 shows only the mother sealing substrate 14M portion on the sticking body (without contact with the lead terminal 31) cut to a predetermined sealing substrate size by a scribe method using a scriber such as a diamond cutter. Thus, the groove 41 having a width that exposes the lead terminal 31 along the dividing region is formed. That is, half-cutting is performed so that the shape of the sealing substrate is defined by the scriber and the extraction terminal 31 is exposed without being damaged. Here, only the mother sealing substrate 14M on the mother translucent substrate 13M is divided into a plurality of sealing substrates. As the dividing method according to the present invention, a dicing method using a dicing blade may be employed in addition to the scribing method.

<Division process>
As shown in FIG. 12, the mother translucent substrate 13 </ b> M is divided in the thickness direction along the division region at the center of the groove 41 by a scriber (not shown) between the sealing substrates on the mother translucent substrate 13 </ b> M. Are cut into a plurality of light-transmitting substrates 13, and the mother light-transmitting substrate 13M is divided for each organic EL panel 11 (the light-transmitting substrate 13 and the sealing substrate 14) (dividing step P5).

<Mounting process>
In advance, a drive IC 12 for driving the organic EL panel 11 is formed on a glass plate to prepare a chip-on-glass COG (step of forming the drive IC in a chip-on-glass form). As shown in FIG. 13, the chip-on-glass COG of the driving IC 12 is bonded to a predetermined position on the sealing substrate 14 of the organic EL panel 11 (mounting process P6).

<Wire bonding process>
Next, as shown in FIG. 14, the wiring 32 that electrically connects the chip-on-glass COG pad of the driving IC 12 and the lead terminal 31 is formed by wire bonding. Between the exposed extraction terminal 31 and the driving IC 12, a wiring 32 by wire bonding is arranged in an annular shape so as to surround the sealing substrate 14 (light emitting region 20). At this time, the wiring 32 by wire bonding is applied on the periphery of the organic EL panel 11 by heating and / or pressure bonding. In this way, the lead-out terminal 31 on the translucent substrate 13 and the driving IC 12 on the back surface of the sealing substrate 14 are contacted using wire bonding (wire bonding step P7). In the organic EL module 10, since the edge of the organic EL panel 11 is directly bonded to the drive IC 12 from the extraction terminal 31, it is not necessary to provide a separate flexi, and the device can be narrowed.

<Molding process>
Next, as shown in FIG. 15, the organic EL panel 11 is placed in the mold MF and filled with resin to form the organic EL module 10 (resin molding step P8). By placing the organic EL panel 11 in a mold MF that defines a cavity CA that forms a predetermined resin portion, filling the mold cavity with a resin, and curing the resin, and then releasing the organic EL panel 11 from the mold MF. 3 is formed such that the side surface of the resin portion MR is flush with the side surface of the light-transmitting substrate 13 of the organic EL module 10 as shown in FIG. If the flexi is connected to the chip-on-glass COG pad of the driving IC 12 before the molding process, and the molding process is performed using a mold having an opening for flexi, an organic EL module directly attached to the flexi is obtained. It is done. Further, if a molding process is performed using a mold having an opening for flexi connection, it is possible to connect the flexi to a chip-on-glass COG pad after forming the organic EL module.

<Second embodiment>
A schematic process flow of a method for manufacturing the organic EL module 10 according to the second embodiment will be described with reference to the drawings.

  In the second embodiment, the following steps are sequentially performed to form a precursor of an organic EL module from one mother light-transmitting substrate (so-called large glass plate) for the mother light-transmitting substrate, and then collectively cut. An individual organic EL module is formed. That is, the second embodiment is a modification of the first embodiment.

  The mother light-transmitting substrate side manufacturing process to the groove forming process of the first embodiment are sequentially performed.

  Therefore, as shown in FIG. 11, the plurality of sealing substrates 14 on the mother light-transmitting substrate 13 </ b> M are divided and formed with a groove 41 having a width that exposes the extraction terminal 31 along the dividing region. However, the width of the groove 41 is set so that the wire nozzle can work without any trouble in the next wire bonding step.

<Mounting process>
In advance, a drive IC 12 for driving the organic EL panel 11 is formed on a glass plate to prepare a chip-on-glass COG (step of forming the drive IC in a chip-on-glass form). As shown in FIG. 16, the chip-on-glass COG of the driving IC 12 is bonded to a predetermined position on the sealing substrate 14 of the mother light transmitting substrate 13M (mounting process P6).

<Wire bonding process>
Next, as shown in FIG. 17, the wiring 32 which electrically connects between the chip-on-glass COG pad of the driving IC 12 and the extraction terminal 31 is formed by wire bonding. In this way, the lead terminals 31 on the mother translucent substrate 13M and the driving IC 12 on the back surface of the sealing substrate 14 are contacted using wire bonding (wire bonding step P7 ′).

<Molding process>
Next, as shown in FIG. 18, the mother translucent substrate 13M is put in a mold MF and filled with a resin, whereby a precursor of an organic EL module (a plurality of organic EL modules connected by a resin filled in a groove) (Resin molding step P8 '). The mother translucent substrate 13M is placed in a mold MF that defines a cavity CA that forms a predetermined resin portion, and the resin is filled into the mold cavity and cured to release the organic EL module precursor from the mold MF. To do. If the flexi is connected to the chip-on-glass COG pad of the driving IC 12 before the molding process, and the molding process is performed using a mold having an opening for flexi, an organic EL module directly attached to the flexi is obtained. It is done. Further, if a molding process is performed using a mold having an opening for flexi connection, it is possible to connect the flexi to a chip-on-glass COG pad after forming the organic EL module. Further, the mold resin MR may be applied on the mother translucent substrate 13M without using the mold MF.

<Division process>
As shown in FIG. 19, the divided region covered with the resin MR filled in the groove between the sealing substrates on the mother light-transmitting substrate 13M is mother-transmitted in the thickness direction by a scriber (not shown). The substrate 13M is cut into a plurality of light-transmitting substrates 13, and the mother light-transmitting substrate 13M is divided for each organic EL module 10 (organic EL panel 11, drive IC 12) (dividing step P5 ′). As described above, the light-transmitting substrate 13 and the divided surface of the resin MR, which are ground by the scriber, are divided into a plurality of individual organic EL modules 10 while forming the same side surface.

  As described above, the mother light-transmitting substrate 13M and the resin MR are fully cut to a predetermined size to obtain the organic EL module 10 including the light-transmitting substrate 13, the bonding means 15, and the sealing substrate 14 as shown in FIG. It is done. By the step of dividing the precursor of the organic EL module, it is possible to form the resin portion MR so that the side surface of the resin portion MR is flush with the side surface of the transparent substrate 13 in each organic EL module 10. Since it is separated into pieces by scriber or dicing, the side surfaces of the translucent substrate 13, the sealing substrate 14 and the bonding means 15 are a common flat surface. Therefore, the resin portion MR fixed to the side surface of the translucent substrate 13 has an external side surface that is also fixed to the bonding means 15 and is flush with the side surface of the sealing substrate 14. Thereby, when viewed from the front of the transparent substrate 13, the transparent substrate 13 is formed with a larger area than the sealing substrate 14. External light from the sealing substrate 14 side is blocked by the resin portion MR (if black), and the organic EL module 10 capable of preventing light from entering from the back surface can be obtained. In this case, as the material of the resin portion MR, a material obtained by mixing a black pigment such as triiron tetroxide with a polymer resin such as an epoxy resin is used. Further, a dark color pigment exhibiting a light shielding property other than black can be used.

  As described above, according to the embodiment, since the dividing width of the sealing substrate 14 can be designed to be narrow even if the width of the resin layer is wide, it is possible to increase the effective number of chips on the mother translucent substrate 13M and increase the yield. Cost reduction can be expected. In addition, since the wide resin layer is cut thinly according to the dividing width of the sealing substrate 14 and the resin layer is formed simultaneously with the organic EL module 10, the number of steps can be reduced. Furthermore, since the resin layer is formed on the side surface of the glass, the glass can be prevented from being chipped or broken, and the handling becomes easy. In addition, the resin portion MR can suppress the incidence of light from the side surface of the mother translucent substrate 13M, and can be expected to improve the characteristics of the organic EL module 10.

  In any of the embodiments, if a molding process is performed such that a part of the surface of the drive IC 12 of the organic EL module 10 is exposed from a part of the resin portion MR, this serves as a heat dissipation measure. Further, a material having high thermal conductivity may be attached to the surface of the driving IC 12 so as to be exposed from a part of the resin portion MR.

  In any of the embodiments, if a molding process is performed in which a part of the resin portion MR at the position where the drive IC 12 of the organic EL module 10 is formed is cut out, this is a space saving measure.

  INDUSTRIAL APPLICABILITY The present invention can be used as a display device, and in particular, a narrow frame organic EL panel using wire bonding that realizes a narrow frame may be used, or a display device that tiles a plurality of organic EL panels can be used. is there.

  Furthermore, the present invention relates to an organic EL module and a method for manufacturing the same, and can be suitably used particularly for a small or medium-sized organic EL module such as a mobile phone, a digital still camera, and a car navigation system. Furthermore, it can also be used as a sub-display such as a liquid crystal TV or a plasma TV.

10 ... Organic EL module 11 ... Organic EL panel 12 ... Drive IC
DESCRIPTION OF SYMBOLS 13 ... Translucent board | substrate 13M ... Mother translucent board | substrate 14 ... Sealing board | substrate 14M ... Mother sealing board | substrate 15 ... Adhesive means 16 ... Display electrode 17 ... Organic EL layer 18 ... Back electrode 19 ... Organic EL element 20 Light emission area 31 ... Lead-out Terminal 32... Wire 41 by wire bonding ... Groove DR ... Dividing region MR ... Resin portion RES ... Sealing recess RES2 ... Dividing recess S ... Sealing region

Claims (3)

An organic EL element including a display electrode, a light emitting layer and a back electrode sealed between a substrate and a sealing substrate;
An extraction terminal electrically connected to at least one of the display electrode and the back electrode at the periphery of the sealing substrate;
A driving IC disposed on the opposite side of the sealing substrate from the substrate;
Wire bonding wiring for electrically connecting the lead terminal and the driving IC;
A flexible wiring board electrically connected to the drive IC;
And at least a resin part in which the wire bonding wiring is embedded,
One side of the said resin part is notched so that the said flexible wiring board may be pulled out, The organic EL module characterized by the above-mentioned.   The organic EL module according to claim 1, wherein the resin portion embeds the driving IC and the sealing substrate.   The organic EL module according to claim 2, wherein the resin portion has a side surface that is flush with a side surface of the substrate.

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