JP5018820B2 - EL display device and manufacturing method thereof - Google Patents

Description

  The present invention relates to an EL (electroluminescence) display device in which a light emitting portion including a light emitting layer made of an EL material is formed on one surface of a substrate, and in particular, a sealing member for sealing the light emitting portion is provided on one surface of the substrate. The present invention relates to an EL display device which is bonded to an adhesive via an adhesive.

  Since the EL display device is self-luminous, it has excellent visibility and is expected to be used as a thin film display, illumination, and backlight. The EL display device is roughly classified into an organic EL display device in which the light emitting layer is made of an organic EL material and an inorganic EL display device in which the light emitting layer is made of an inorganic EL material.

  Conventionally, the EL display device has a problem that a non-light emitting portion called a dark spot is formed in the light emitting portion due to moisture in the environment during operation. Therefore, by using a sealing member made of metal, glass, or the like, the light emitting part is sealed by adhering the sealing member on the substrate via an adhesive so as to cover the light emitting part on the substrate, and the dark Spots are prevented (for example, see Patent Documents 1 to 6).

  For example, in the case of an organic EL display device, a sealing can such as a stainless steel can or engraved glass is used as a sealing member, and the outer periphery of the light emitting portion on the substrate is sealed with an ultraviolet curable adhesive. In this case, dry nitrogen gas is sealed in the sealed sealing can, that is, in the hollow portion, and moisture entering from the outside is adsorbed by holding a moisture absorbent such as barium oxide.

  However, in the case of a metal sealing can such as stainless steel, the flatness of the sealing can formed by drawing is poor, for example, about 0.3 mm, so the cross-sectional thickness of the sealing portion in the sealing can is thick. As the cross-sectional area increases, the amount of moisture that permeates increases or a gap is easily formed on the adhesive surface of the sealing can.

  As a result, the amount of moisture entering the sealing can from the outside increases, and the ability of the hygroscopic agent is insufficient, so that the above-described non-light emitting portion called a dark spot is easily formed.

  On the other hand, engraving glass with high flatness is used as the sealing can. In this case, soda glass containing an alkali component is often used for cost reduction. In such a case, there arises a problem that peeling occurs at the interface between the sealing can and the adhesive in a high temperature and high humidity environment.

  On the other hand, in the case of an inorganic EL display device, a transparent glass plate is used as a sealing member for the purpose of mechanical protection, and an adhesive is disposed on the entire surface of the glass plate and adhered onto one surface of a substrate including a light emitting portion. However, also in this case, there arises a problem that peeling occurs at the interface between the sealing member and the adhesive.

Japanese Patent No. 3991672 JP 2000-1000056 JP 2003-7453 A Japanese Patent Laid-Open No. 2004-22511 JP 2007-5060 A Japanese Utility Model Publication No. 61-129299

  In order to solve the above problems, the present inventors have conducted intensive studies. As a result, peeling of the adhesive portion by the adhesive causes elution of alkali ions such as sodium contained in the glass constituting the substrate and the sealing member. I found out that there was.

  Specifically, as a peeling mechanism, it has been found that the bond between the adhesive and the glass is broken by the eluted alkali ions. The bond between the adhesive and glass is generally a hydrogen bond or an intermolecular force.

  Therefore, the present inventors examined the method described in Patent Document 1 described above. In the above-mentioned patent document 1, peeling of an adhesive portion is suppressed by forming an ion elution preventing film that suppresses elution of alkali ions on an interface with an adhesive in a substrate made of glass or a sealing member, that is, an adhesive surface. Like to do.

  According to the inventor's study, when an EL display device is considered as a vehicle-mounted product, when it is placed in a high-temperature and high-humidity atmosphere such as a vehicle-mounted environment for a long time, an elution preventing film is formed as in Patent Document 1 above. Even when formed, it was found that the adhesive strength of the adhesive was not a little reduced, and peeling occurred in some cases.

  The present invention has been made in view of the above problems, and is formed by forming a light emitting portion on one surface side of a substrate and bonding a sealing member for sealing the light emitting portion to one surface of the substrate via an adhesive. An object of the EL display device is to prevent a decrease in adhesive strength between a substrate and a sealing member even in a high temperature and high humidity atmosphere.

  In order to achieve the above object, the present inventors have conducted intensive studies. As a result, the cause of peeling of the bonded portion by the adhesive is alkali ions that are eluted from the surface other than the adhesive surface, not from the adhesive surface where the adhesive is disposed, among the glass members such as the sealing member and the substrate. I found out.

  Specifically, alkali ions eluted from the cut surface formed by cutting the glass member are the cause. If this cut surface exists as a surface adjacent to the adhesive other than the adhesive surface of the glass member, the alkali ions eluted to the cut surface come into contact with the adjacent adhesive and bond the adhesive to the glass. It is considered that the adhesive strength is reduced.

  Then, this inventor paid attention to suppressing the elution of the alkali ion from the said cut surface in the board | substrate and sealing member which consist of glass, and came to create the following solution means.

That is, in the invention described in claim 1, both the substrate (10) and the sealing member (100) are configured as glass members made of glass containing an alkali component, and the glass members (10, 100) Is a surface adjacent to the adhesive (110) other than the one surface (11, 101) on which the adhesive (110) is disposed, and is formed by cutting the glass member (10, 100) ( 12 and 102), and an elution preventing film (140) for preventing elution of alkali ions in the glass constituting the glass member is provided on the cut surface (12, 102). It is provided so that it may coat | cover.

According thereto, the substrate (10) and both the sealing member (100) is configured as a glass member, an adhesive a surface other than a surface (11 and 101) in the glass member (10, 100) ( 110) When the surface adjacent to 110) is configured as a cut surface (12, 102), the cut surface (12, 102) is covered with the elution preventing film (140). 102), it is possible to prevent alkali ions from eluting and coming into contact with the adhesive (110) of the adhesive part (200).

  Therefore, according to the present invention, it is possible to prevent a decrease in the adhesive strength between the substrate (10) and the sealing member (100) even in a high temperature and high humidity atmosphere.

  Here, as in the invention according to claim 2, in the EL display device according to claim 1, the elution preventing film (140) is a glass member (10, 100) on which the adhesive (110) is disposed. It is good also as what is formed with the said adhesive agent (110) which protruded from the one surface (11,101) to the cut surface (12,102).

  According to this, the bonding part (200) between the substrate (10) and the sealing member (100) and the elution preventing film (140) can be formed of the same material as the adhesive (110). As a result, it is preferable in terms of cost reduction.

Further, the invention described in claim 1, the site where the adhesive of one side of the sealing member (100) (101) (110) is arranged, projecting the one side of the (101) as a convex portion (101a) A concave portion (101b) is formed adjacent to the portion (101a) and recessed from the convex portion (101a), and the adhesive (110) is applied to one surface (11) of the substrate (10) by the convex portion (101a). Furthermore, the adhesive (110) protrudes from the convex portion (101a) so as to have a shape in which the skirt extends from the convex portion (101a) to the concave portion (101b), and the concave portion (101b) It is as covering the surface.

  When the sealing member (100) as a glass member is cut by scribing or the like, a recess (101b) is formed in a portion where the adhesive (110) on one surface (101) is disposed in order to facilitate cutting. There is a case. In this case, as a method of forming the concave portion (101b), a method such as etching or cutting is usually employed. Therefore, the surface of the concave portion (101b) also has alkaline ions as much as the cut surfaces (12, 102). Is easy to elute.

  Therefore, in the present invention, the surface of the concave portion (101b) is covered with the adhesive (110) to suppress the alkali ions eluted from coming into contact with the adhesive (110) of the adhesive portion (200). It becomes possible.

The invention of claim 3 or later, has been made for the method for manufacturing the EL display device according to 請 Motomeko 1 or 2.

That is, in the manufacturing method according to claim 3 , after applying the adhesive (110) to one surface (101) of the sealing member (100), the substrate (10) is bonded through the adhesive (110), Subsequently, the adhesive (110) is cured to perform adhesion, and before applying the adhesive (110), the concave portion (101b) formed on the one surface (101) of the sealing member (100). It is characterized in that a treatment for improving the wettability with respect to the adhesive (110) is performed on the surface.

  According to this, the adhesive (110) is applied to one surface (101) of the sealing member (100) including the recess (101b) in a state where the wettability of the surface of the recess (101b) to the adhesive (110) is improved. Since it is applied, the adhesive (110) is likely to spread on the surface of the recess (101b).

Moreover, according to the manufacturing method of Claim 4 and Claim 6 , with the sealing member (100) positioned in the lower side in the gravitational direction and the substrate (10) positioned in the upper side in the gravitational direction, the adhesive ( 110) and curing of the adhesive (110). In addition, this method may be performed in combination with the manufacturing method of Claim 3 , and may be performed independently.

  According to this, when the adhesive (110) is applied to one surface (101) of the sealing member (100), the adhesive (110) easily spreads on the surface of the recess (101b) due to the action of gravity.

Moreover, according to the manufacturing method of Claim 5 and Claim 7 , before apply | coating an adhesive agent (110), the site | part which contacts an adhesive agent (110) among the one surfaces (11) of a board | substrate (10). Is covered with a wettability-reducing film (300) that has a lower wettability with respect to the adhesive (110) than a portion in contact with the adhesive (110). In addition, this method may be performed in combination with the manufacturing method of Claim 3 or Claim 4 , and may be performed independently.

  According to this, since the adhesive (110) applied to one surface (101) of the sealing member (100) is difficult to spread on the one surface (11) side of the substrate (10) after bonding, the concave portion This is preferable in that the adhesive (110) is likely to spread on the surface of (101b).

  In addition, the code | symbol in the bracket | parenthesis of each means described in the claim and this column is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

1 is a schematic cross-sectional view of an organic EL display device according to a first embodiment of the present invention. It is an enlarged view of the adhesion part of the board | substrate and sealing member in FIG. 1, and its vicinity part. It is a partial schematic sectional drawing of the organic electroluminescence display as a prototype of this inventor. It is a schematic sectional drawing which shows the principal part of the EL display apparatus as another example of the said 1st Embodiment. It is a schematic sectional drawing of the organic electroluminescence display which concerns on 2nd Embodiment of this invention. It is a schematic sectional drawing which shows the principal part of the manufacturing method of the organic electroluminescence display in the said 2nd Embodiment. It is a schematic sectional drawing of the organic electroluminescence display which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings in order to simplify the description.

(First embodiment)
FIG. 1 is a diagram showing a schematic cross-sectional configuration of the organic EL display device S1 according to the first embodiment of the present invention, and FIG. 2 shows an adhesive portion 200 between the substrate 10 and the sealing member 100 in FIG. It is an enlarged view of a vicinity part. In FIG. 2, the configuration shown in FIG. 1 is shown rotated 180 degrees, but FIG. 2 and FIG. 1 are the same.

  The substrate 10 is made of a plate made of glass containing an alkali component, and has, for example, a rectangular plate shape. Here, the alkali component is sodium or potassium, and the glass constituting the substrate 10 is, for example, soda glass.

On one surface (upper surface of the substrate 10 in FIG. 1) 11 of this substrate 10, a SiO ₂ film having a thickness of about 10 nm formed by a sputtering method or a coating method is formed, although not shown. Hereinafter, this SiO ₂ film is referred to as a substrate-side SiO ₂ film.

A lower electrode 20 as an anode made of a transparent electrode material is formed on the substrate-side SiO ₂ film. In this example, a plurality of lower electrodes 20 extending in the left-right direction in FIG. 1 are formed in stripes along the direction perpendicular to the plane of FIG. 1, and the substrate-side SiO ₂ film is formed between the lower electrodes 20. Covered. In this embodiment, the lower electrode 20 is a transparent electrode made of ITO (indium and tin oxide) having a thickness of about 150 nm formed by sputtering or the like.

  On the lower electrode 20, an organic layer 30 containing an organic EL material and an upper electrode 40 as a cathode are formed. In the example shown in FIG. 1, the organic layer 30 and the upper electrode 40 have a stripe shape extending along the direction orthogonal to the stripe direction of the lower electrode 20, that is, the direction perpendicular to the paper surface in FIG. 1.

  In the present embodiment, the organic layer 30 is a light emitting layer made of Alq (8-hydroxyquinoline aluminum complex) doped with 1% coumarin from the lower electrode 20 side, a hole transport layer made of α-naphthylphenylbenzene. , And an electron transport layer made of Alq are sequentially deposited and laminated by a vapor deposition method or the like. The upper electrode 40 has a two-layer structure in which LiF and Al are sequentially formed and stacked from the organic layer 30 side by vapor deposition or the like.

  Thus, a portion where the lower electrode 20, the organic layer 30 and the upper electrode 40 intersect and overlap each other is configured as the light emitting unit 50. That is, when viewed from a direction orthogonal to the surface 11 of the substrate 10, the plurality of light emitting units 50 are arranged in a grid as pixels. In the light emitting unit 50, the light emitting layer in the organic layer 30 emits light by applying an electric field between the lower electrode 20 and the upper electrode 40.

In the present embodiment, the light emitting unit 50 is made of the specific material as described above, but this EL display device S1 is taken out from the other surface of the substrate 10 (the lower surface of the substrate 10 in FIG. 1). As the light emission characteristics, high luminance green light emission of 5000 cd / m ² is obtained with an applied voltage of 10V.

  In this embodiment, the sealing member 100 is made of a plate made of glass containing an alkali component such as soda glass, like the substrate 10, and has, for example, a rectangular plate shape. The sealing member 100 is disposed so that one surface (the lower surface of the sealing member 100 in FIG. 1) 101 side faces the one surface 11 of the substrate 10.

  The sealing member 100 covers the light emitting unit 50 on the one surface 11 of the substrate 10. Further, in the peripheral portion of the light emitting unit 50, the one surface 11 of the substrate 10 and the one surface 101 of the sealing member 100 are bonded through an adhesive 110. The bonding portion 200 between the substrate 10 and the sealing member 100 refers to a portion where the surfaces 11 and 101 of both the members 10 and 110 are bonded to each other via the adhesive 110.

  The adhesive 110 is made of an ultraviolet curable epoxy resin or the like, and is applied and disposed on one surface 101 of the sealing member 100, and then cured by ultraviolet irradiation to perform adhesion. In the present embodiment, the adhesive 110 is formed so as to surround the light emitting unit 50, and the light emitting unit 50 is sealed by the sealing member 100 on the inner peripheral side of the adhesive 110 and is protected from the outside. ing.

  Here, in the present embodiment, the portion of the one surface 101 of the sealing member 100 that is located on the inner peripheral side of the adhesive 110 and covers the light emitting portion 50 is a carved portion that is carved by etching or cutting. A recess 103 is formed. The light emitting unit 50 is sealed in the recess 103. In the recess 103, dry nitrogen gas is sealed and a moisture absorbent 120 such as barium oxide is held, thereby adsorbing moisture entering from the outside.

  Moreover, in this embodiment, in the sealing member 100, the one surface 101 is configured as an adhesive surface on which the adhesive 110 is disposed, but the portion of the one surface 101 on which the adhesive 110 is disposed. Further, an ion elution preventing film 130 for preventing elution of alkali ions in the glass constituting the sealing member 100 is formed. Hereinafter, the ion elution preventing film 130 is referred to as a first ion elution preventing film 130.

  The first ion elution preventing film 130 is the same as that described in Patent Document 1, specifically, a tin film having a thickness of 1 nm or more and 1 μm or less. It is formed by the manufacturing method of soda glass by the method. And in the peripheral part in the one surface 101 of the sealing member 100, the 1st ion elution prevention film 130 and the one surface 11 of the board | substrate 10 are adhere | attached through the adhesive agent 110. FIG.

  Moreover, as above-mentioned, in this embodiment, both the board | substrate 10 and the sealing member 100 are comprised as a glass member which consists of glass containing an alkaline component. These glass members 10 and 100 are obtained by cutting multiple glass plates into pieces by using a technique such as scribing or dicing cut.

  Therefore, the end surfaces 12 and 102 located at the outer peripheral ends of the one surfaces 11 and 101 of the glass members 10 and 100 are configured as cut surfaces formed by cutting the glass members 10 and 100 themselves. That is, the end surface 12 of the substrate 10 is a cut surface of the substrate 10 formed by cutting the substrate 10 itself, and the end surface 102 of the sealing member 100 is formed by cutting the sealing member 100 itself. 3 is a cut surface of the sealing member 100 made.

  As described above, in the present embodiment, the end surfaces 12 and 102 of the glass members 10 and 100 are adjacent to the outer peripheral end portion of the one surface 11 and 101 as the bonding surface on which the adhesive 110 is disposed, and are defined as the cutting surfaces 12 and 102. It is configured.

  In other words, in each of the substrate 10 and the sealing member 100, the end surfaces 12 and 102 are adjacent to the one surface 11 or 101 that is an adhesive surface through a corner portion and intersect with the one surface 11 or 101. Yes, it is a surface extending along the thickness direction of the substrate 10 and the sealing member 100. Here, the thickness direction of the substrate 10 and the sealing member 100 is also the stacking direction of the stacked substrate 10 and the sealing member 100.

And in this embodiment, as FIG. 1, FIG. 2 shows, the adhesive agent 110 is located in the outer peripheral edge part of the one surfaces 11 and 101 of the glass members 10 and 100. As shown in FIG. Therefore, the end surfaces 12 and 102 as the cut surfaces adjacent to the outer peripheral ends of the one surfaces 11 and 101 are adjacent to and in contact with the adhesive 110. That is, each cut surface 12, 102 is adjacent to the adhesive 110.

  Thus, the end surface 12 of the substrate 10 is a surface other than the one surface 11 of the substrate 10 and is a cut surface adjacent to the adhesive 110. The end surface 102 of the sealing member 100 is a surface other than the one surface 101 of the sealing member 100 and is a cut surface 102 adjacent to the adhesive 110.

  As shown in FIGS. 1 and 2, in this embodiment, the second ion elution preventing film 140 is formed on the cut surfaces 12 and 102 of both the end surface 12 of the substrate 10 and the end surface 102 of the sealing member 100. Is provided. The cut surfaces 12 and 102 are covered with a second ion elution preventing film 140.

The second ion elution preventing film 140 may be made of a material that does not allow alkali ions such as sodium ions to pass therethrough, preferably a material that does not further pass moisture, and may be a resin, ceramic, metal film, or the like. It may be. For example, examples of the resin include an ultraviolet curable epoxy resin used for the adhesive 110, and examples of the ceramic include an insulating inorganic material such as SiO ₂ .

  In FIG. 1, the second ion elution preventing film 140 is provided on the right end surface 12 adjacent to the adhesive 110 in the end surface 12 of the substrate 10, but on the left end surface 12, The second ion elution preventing film 140 is not provided.

  In FIG. 1, the left portion of the substrate 10 protrudes larger than the left end portion of the sealing member 100 so as to be configured as an electrode extraction portion for connecting the electrodes 20 and 40 to the outside. Therefore, the left end surface 12 of the substrate 10 is not in contact with the adhesive 110 and is separated.

Therefore, even if the second ion elution preventing film 140 is not provided on the left end surface 12 of the substrate 10, there is little possibility that alkali ions eluted from the end surface 12 come into contact with the adhesive 110. On the other hand, since the left end face 102 of the sealing member 100 in FIG. 1 is in contact with the adhesive 110, the second ion elution preventing film 140 is provided.

  Thus, in the organic EL display device S1 of the present embodiment, both the substrate 10 and the sealing member 100 are configured as the glass members 10 and 100, and one surface (that is, an adhesive surface) of the glass members 10 and 100. End surfaces 12 and 102 that are surfaces other than 11 and 101 and are adjacent to the adhesive 110 are configured as cut surfaces.

  Here, FIG. 3 is a partial schematic cross-sectional view of an organic EL display device as a prototype of the present inventor. This prototype is a second ion in the configuration of the present embodiment shown in FIGS. 1 and 2. In this configuration, the elution preventing film 140 is not provided.

  Here, when the organic EL display device S1 of the present embodiment is mounted on an automobile, the device S1 is exposed to a much higher temperature and humidity environment than that for consumer use. In such a high-temperature and high-humidity atmosphere, if the second ion elution preventing film 140 is not provided as shown in FIG. Sodium ions contained in the glass constituting the member 100 are eluted, and travel along the surfaces of the cut surfaces 12 and 102 to reach the bonding portion 200 and contact the adhesive 110.

  As described above, the adhesive 110 in contact with the alkali ions has a low adhesive strength and may be peeled off. However, in the present embodiment, both the cut surfaces 12 and 102 are covered with the second ion elution preventing film 140.

  Therefore, according to the present embodiment, it is possible to prevent sodium alkali ions contained in the glass from being eluted from the cut surfaces 12 and 102 and coming into contact with the adhesive 110 of the bonding portion 200. Therefore, the bond between the glass constituting the glass members 10 and 100 and the adhesive 110 is not broken by the alkali ions.

  Thus, according to the present embodiment, it is possible to prevent a decrease in the adhesive strength between the substrate 10 and the sealing member 100 even in a high-temperature and high-humidity atmosphere such as an in-vehicle environment, and the adhesion part 200 can be appropriately peeled off. It is possible to prevent and provide a highly reliable configuration.

  Next, a method for manufacturing the organic EL display device S1 of the present embodiment will be described. First, the substrate 10 on which the light emitting unit 50 is formed on the one surface 11 and the sealing member 100 on which the concave portion 103 and the first ion elution preventing film 130 are formed are prepared.

  Here, as the substrate 10, a plurality of glass plates are prepared in which a plurality of substrates 10 having a size corresponding to one EL display device S 1 are integrally connected. A plurality of glass plates in which a plurality of sealing members 100 each having a size corresponding to each EL display device S1 are integrally connected are prepared.

  Then, in the state of the multiple glass plates, the substrate 10 and the sealing member 100 are bonded to each other through the adhesive 110, and then the adhesive 110 is cured and bonded, and then rupture or dicing by scribing. By cutting or the like, it is cut into the size of one EL display device S1 and separated into individual pieces. As described above, Patent Document 5 discloses a method for manufacturing a plurality of organic EL display devices S1 by sealing and dividing a substrate having a plurality of organic EL display units.

  In this case, it is easy to previously form the first ion elution preventing film 130 in a state of multiple glass plates on the one surface 101 of the sealing member 100 in the organic EL display device S1, but the substrate 10 and the sealing member The second ion elution preventing film 140 can only be formed on the cut surfaces 12 and 102 of the stop member 100 after the cutting.

  Therefore, in the present embodiment, after the cutting, the second ion elution is performed on the cut surfaces 12 and 102 of the glass members 10 and 100 by applying and curing a resin or an insulating inorganic material, or forming a film such as sputtering or vapor deposition. The prevention film 140 is formed. Thereby, the EL display device S1 of the present embodiment is completed.

An example of a method of forming the second ion elution preventing film 140 is to apply an insulating inorganic material made of SiO ₂ or the like to the cut surfaces 12 and 102 by brushing or the like, and to dry and harden this. Thus, the second ion elution preventing film 140 is formed. In this case, it is better to apply as soon as possible after the cutting. This is because alkali ions are eluted from the cut surfaces 12 and 102. In particular, the elution increases in a high temperature and high humidity environment.

  FIG. 4 is a schematic cross-sectional view showing a main part of an EL display device as another example of this embodiment, and shows an adhesive part 200 and its vicinity in the other example.

  Also in the example shown in FIG. 4, as in the example shown in FIGS. 1 and 2, the adhesive 110 is between the one surface 11, 101 of the substrate 10 and the sealing member 100 that are glass members, The end surfaces 12 and 102 adjacent to the outer peripheral end portions of the one surface 11 and 101 of the substrate 10 and the sealing member 100 are cut surfaces while being disposed at the outer peripheral end portions of the one surface 11 and 101. The second ion elution preventing film 140 is provided on both the cut surfaces 12 and 102 adjacent to the adhesive 110.

  Here, in FIG. 4, in the substrate 10 and the sealing member 100, the second surface continuously extends from the end surfaces 12 and 102 to the other surface of the substrate 10 and the other surface of the sealing member 100 adjacent thereto. An ion elution preventing film 140 is provided. These other surfaces are plate surfaces located on the side opposite to the one surface 11, 101 in each glass member 10, 100.

That is, as shown in FIG. 4, the second ion elution preventing film 140 may be provided on the entire outer surface of the organic EL display device S <b> 1 so as to cover the entire surface. In this case, coating by brushing or the like is also possible. However, a film of an insulating inorganic material made of, for example, SiO ₂ is formed by sputtering or coating, and this is used as the second ion elution preventing film 140. Good. The coating method is a method in which the entire organic EL display device S1 is dipped and adhered to molten SiO ₂ or the like.

  The method of manufacturing the organic EL display device S1 of this embodiment is not a method of manufacturing a plurality of organic EL display devices S1 by sealing and dividing a substrate having a plurality of organic EL display units as described above. It may be a method of performing sealing after dividing into two. That is, you may employ | adopt the method of adhere | attaching the board | substrate 10 cut | disconnected by the size of one apparatus, and the sealing member 100 via the adhesive agent 110. FIG.

  In this case, in addition to the example described above, the adhesive 110 can be used also as the second ion elution preventing film 140. Specifically, a large amount of the adhesive 110 is applied in advance to the sealing member 100 or the substrate 10, and then the substrate 10 and the sealing member 100 are overlapped to attach the adhesive 110 to the bonding surface. 11 and 101, and protrudes to the cut surfaces 12 and 102 of the substrate 10 and the sealing member 100.

  Thereby, in the configuration shown in FIGS. 1 and 2, the second ion elution preventing film 140 protrudes from the one surface 11 of the substrate 10 and the one surface 101 of the sealing member 100 to the end surfaces 12 and 102 as the cut surfaces. It is formed by the adhesive 110. In addition, in this method, the adhesive 110 may be further applied so as to protrude to the other surface of the substrate 10 or the sealing member 100, and the configuration shown in FIG.

  In this case, since the adhesive portion 200 between the substrate 10 and the sealing member 100 and the second ion elution preventing film 140 can be formed of the same material as the adhesive 110, the cost can be reduced. preferable.

  In addition, since the thermal expansion coefficient is substantially the same between the bonding portion 200 and the second ion elution prevention film 140, the thermal stress generated due to a temperature change or the like is applied to the bonding portion 200 and the second ion elution prevention film 140. 140 and the same level. As a result, there is an advantage that deformation due to the thermal stress can be prevented.

(Second Embodiment)
FIG. 5 is a schematic cross-sectional view showing a main part of an EL display device according to the second embodiment of the present invention, and shows an adhesive portion 200 and its vicinity in the EL display device. Here, the difference from the first embodiment will be mainly described.

  As shown in FIG. 5, the present embodiment has a configuration in which the second ion elution preventing film 140 is provided on the cut surfaces 12 and 102 of the glass members 10 and 100, as in the first embodiment. Furthermore, unevenness is provided in the arrangement site of the adhesive 110, and the arrangement configuration of the adhesive 110 corresponding to that is realized, and the other configuration is the same as that of the first embodiment.

  As shown in FIG. 5, a portion of one surface 101 of the sealing member 100, which is a glass member, has a concave portion 101b adjacent to the convex portion 101a, with the one surface 101 serving as a convex portion 101a. Is formed. That is, a portion of the surface 101 of the sealing member 100 where the adhesive 110 is disposed is an uneven surface. The irregularities are formed by etching or cutting.

Here, the convex portion 101a does not protrude from the one surface 101 of the sealing member 100, and only the concave portion 101b that is recessed from the one surface 101 is formed. Therefore, the adjacent portion of the concave portion 101b is the convex portion 101a. It is what is done.

  That is, the convex portion 101a has a top portion located on the one surface 101 of the sealing member 100, and the concave portion 101b is recessed from the one surface 101, and the convex and concave portions are constituted by the convex portion 101a and the concave portion 101b. Has been.

  And the sealing member 100 is a thing with the thickness in the recessed part 101b smaller than the thickness in the convex part 101a. That is, the sealing member 100 is thinned by the recess 101b. Here, in FIG. 5, the concave portion 101 b on the left side of the convex portion 101 a is a concave portion 101 b that continues from the concave portion 103 (see FIG. 1) as the engraved portion, and the concave portion 101 b on the right side of the convex portion 101 a is cut. It is adjacent to the end surface 102 of the sealing member 100 which is a surface.

  The adhesive 110 is provided over both the convex portion 101a and the concave portion 101b, and is adhered to the one surface 11 of the substrate 10 by the convex portion 101a. In the concave portion 101b, the adhesive 110 and the substrate are bonded. 10 is separated from one surface 11.

  Further, in the recess 101b, as shown in FIG. 5, the adhesive 110 protrudes from the protrusion 101a to the recess 101b so as to have a shape in which the skirt extends from the protrusion 101a to the recess 101b. The surface of the recess 101b is covered with an adhesive 110.

  As described above, the configuration of the present embodiment is substantially the same as the configuration shown in FIGS. 1 and 2, in the portion where the adhesive 110 is disposed on the one surface 101 of the sealing member 100. A recess 101b is formed in a portion of the end surface 102 side of 100. As a result, the thickness of the cut portion of the sealing member 100 is reduced by the recess 101b and is not bonded by the adhesive 110.

  Such a configuration of the present embodiment is preferable for facilitating the cutting when the sealing member 100 as the glass member is cut by breaking by scribing. Specifically, in the method of manufacturing the plurality of organic EL display devices S1 by sealing and dividing the substrate having the plurality of organic EL display portions described above, it is effective in the case where breakage is performed by scribe after sealing.

  The reason why this embodiment is effective for scribing will be described with reference to FIG. FIG. 6 is a schematic cross-sectional view showing the main part of the method for manufacturing the organic EL display device of the present embodiment, and shows a cutting process by scribing.

  First, in manufacturing the organic EL display device of the present embodiment, the substrate 10 having the light emitting portion 50 formed on the one surface 11 and the sealing member 100 having the concave portion 103 and the first ion elution preventing film 130 formed thereon. And prepare. As the substrate 10 and the sealing member 100, multiple glass plates as described above are prepared.

  Here, as the sealing member 100, the first ion elution preventing film 130 is formed on the one surface 101, and then the recesses 103 and 101 b are formed on the one surface 101 by etching or cutting. As a result, the first ion elution preventing film 130 remains on the convex portion 101a but disappears on the concave portions 103 and 101b.

  Next, the substrate 10 as the multiple glass plates and the sealing member 100 are bonded to each other through the adhesive 110, and then the adhesive 110 is cured and bonded. The adhesive 110 is disposed by applying the adhesive 110 to one surface 101 of the sealing member 100. At this time, the adhesive 110 is bonded so as to spread from the convex portion 101a to the concave portion 101b of the one surface 101 of the sealing member 100. Agent 110 is applied.

  Thus, the state in which the substrate 10 and the sealing member 100 are bonded via the adhesive 110 is shown in FIG. Then, scribing is performed in this state. In this scribing, as shown in FIG. 6, grooves K are formed on the other surface of the substrate 10 and the other surface of the sealing member 100 by a cutting tool or the like, respectively.

  Then, the workpiece is bent at the groove K, and a crack is generated from the groove K, whereby the substrate 10 and the sealing member 100 are broken, and the cutting process is completed. Then, after the cutting, the second ion elution preventing film 140 is formed on the cut surfaces 12 and 102 of the glass members 10 and 100 by film formation such as coating / curing or sputtering or vapor deposition. Thereby, the EL display device of this embodiment is completed.

  Here, when performing the cutting process by scribing of the above-described embodiment, as shown in FIGS. 1 and 2, the thickness of the substrate 10 and the sealing member 100 is thick at the cutting portion, and When the both 10 and 100 are bonded via the adhesive 110, there is a possibility that breakage by scribe becomes difficult.

  On the other hand, in the present embodiment, the concave portion 101b is formed on the one surface 101 of the sealing member 100 to reduce the thickness of the sealing member 100 at the cut portion, and the substrate 10 is sealed with the cut portion. Since the stop member 100 is separated, it can be easily broken by scribing.

  In the case of this embodiment, the surface of the recess 101b formed in the sealing member 100 that is a glass member is configured as an etching surface or a cutting surface, and therefore the surface of the recess 101b is also connected to the cut surfaces 12 and 102. Alkaline ions are likely to elute to the same extent.

  In this respect, in this embodiment, since the surface of the recess 101b is covered with the adhesive 110, it is possible to prevent alkali ions from eluting from the surface of the recess 101b. It is possible to prevent contact with the adhesive 110.

  Therefore, in addition to the effect of the second ion elution preventing film 140 described above, the effect of preventing the elution of alkali ions by the adhesive 110 of the recess 101b is exhibited, thereby preventing the decrease in the adhesive strength.

  By the way, in the manufacturing method of the organic EL display device of this embodiment, as described above, after applying the adhesive 110 to the one surface 101 of the sealing member 100, the substrate 10 is bonded through the adhesive 110, and then Then, the adhesive 110 is cured to perform adhesion.

  Here, in the application process of the adhesive 110, by applying the adhesive 110, the adhesive 110 protrudes from the convex portion 101a so that the base extends from the convex portion 101a to the concave portion 101b, and the concave portion (101b). The state which coats the surface of is realized. Therefore, a preferable mode for performing application in such a state will be described.

  First, as a first aspect, before applying the adhesive 110, a process for improving the wettability of the adhesive 110 on the surface of the recess 101b formed on the one surface 101 of the sealing member 100 is performed. Do. Specific examples of the wettability improvement process include a method of irradiating the surface of the recess 101b with ultraviolet rays to remove carbides and the like adhering to the surface. That is, the surface is cleaned by ultraviolet irradiation.

  According to this, after the treatment, the adhesive 110 is applied to the one surface 101 of the sealing member 100 including the recess 101b in a state where the wettability of the surface of the recess 101b to the adhesive 110 is improved. The adhesive 110 tends to spread on the surface.

  As a second aspect, after the adhesive 110 is applied to one surface 101 of the sealing member 100, the bonding is performed with the sealing member 100 positioned on the lower side in the gravity direction and the substrate 10 positioned on the upper side in the gravity direction. Bonding via the agent 110 and curing of the adhesive 110 are performed. According to this, when the adhesive 110 is applied, the adhesive 110 falls from the convex portion 101a to the concave portion 101b due to the action of gravity, so that the adhesive 110 easily spreads on the surface of the concave portion 101b.

  As a third aspect, as shown in FIGS. 5 and 6, before applying the adhesive 110, the peripheral portion of the portion that contacts the adhesive 110 in the one surface 11 of the substrate 10 is low wetted. Coating with the property-reducing film (300), and thereafter, the adhesive 110 is applied and the substrate 10 and the sealing member 100 are bonded together.

  The wettability reducing film 300 has a lower wettability with respect to the adhesive 110 than a portion in contact with the adhesive 110 on the one surface 11 of the substrate 10. Specifically, the wettability reducing film 300 includes a film made of a fluororesin such as Teflon (registered trademark).

  According to the third aspect, the adhesive 110 applied to the one surface 101 of the sealing member 100 is less likely to spread on the one surface 11 side of the substrate 10 after the substrate 10 and the sealing member 100 are bonded together. . Therefore, the adhesive 110 easily spreads on the surface of the recess 101b of the sealing member 100.

  In addition, in order to show an effect that the adhesive 110 easily spreads on the surface of the concave portion 101b of the sealing member 100, these three modes may be performed independently, or a plurality of modes may be combined. You may go.

  In the present embodiment, providing the concave portion 101b in the sealing member 100 is effective for cutting by scribing, but cutting is performed by dicing cut even in the configuration in which the concave portion 101b is provided. It may be a thing.

  Moreover, even if it is the structure which provided the said recessed part 101b in the sealing member 100 like this embodiment, the board | substrate 10 cut | disconnected by the size of one apparatus and the sealing member 100 are passed through the adhesive agent 110. FIG. The method of adhering may be adopted.

  In this case, a technique in which the adhesive 110 as shown in the first embodiment is also used as the second ion elution preventing film 140 can be employed. Specifically, a large amount of the adhesive 110 is applied in advance to the sealing member 100 or the substrate 10, and then the substrate 10 and the sealing member 100 are overlapped, so that the adhesive 110 is made convex. What is necessary is just to wrap around from the part 101a to the recessed part 101b and further to the cut surfaces 12 and 102.

  Also in this case, the bonding portion 200 and the second ion elution preventing film 140 can be formed of the same material as the adhesive 110, and the bonding portion 200 and the second ion elution preventing film 140 are formed. And the effect that a thermal expansion coefficient can be made substantially the same is exhibited.

(Other embodiments)
In each of the above embodiments, both the substrate 10 and the sealing member 100 are glass members, but only one of them may be a glass member. For example, in FIGS. 1 and 2, when only the substrate 10 is a glass member and the sealing member 100 is made of stainless steel, the second ion elution preventing film 140 is provided on the end surface 12 of the substrate 10. However, the structure which is not provided in the end surface 102 of the sealing member 100 may be sufficient.

  Further, in each of the above embodiments, the adhesive 110 is formed between the substrate 10 and the sealing member 100 so as to surround the light emitting unit 50, and the sealing is performed on the inner peripheral side of the adhesive 110. Sealing was performed in a state where the member 100 and the light emitting unit 50 were separated.

  Here, one surface 11 of the substrate 10 and one surface 101 of the sealing member 100 are bonded via an adhesive 110 at the periphery of the light emitting unit 50, and the light emitting unit 50 itself is further sealed with the adhesive 110. May be. FIG. 7 is a schematic cross-sectional view showing an organic EL display device of such an example as another embodiment.

  In the example shown in FIG. 7, the sealing member 100 is a glass member in which the entire surface 101 facing the one surface 11 of the substrate 10 is a flat surface, and the sealing member 100 and the substrate 10 are opposed to each other. The whole is filled with the adhesive 110 and is bonded.

  Also in this case, as shown in FIG. 7, the second ion is applied to the end surfaces 12 and 102 adjacent to the adhesive surfaces 11 and 101 and the adhesive 110 of the substrate 10 and the sealing member 100 that are glass members. An elution preventing film 140 is provided, and the end surfaces 12 and 102 are covered with the second ion elution preventing film 140.

  Therefore, also in this case, alkali ions are prevented from eluting from the end faces 12 and 102 as the cut surfaces, and the adhesive strength between the substrate 10 and the sealing member 100 is maintained even in a high-temperature and high-humidity atmosphere such as an in-vehicle environment. Can be prevented, the peeling of the bonding portion 200 can be appropriately prevented, and a configuration with excellent reliability can be provided.

  Further, the adhesive 110 may be cured by heat after application, if possible, other than the one cured by ultraviolet light after application. Further, in terms of preventing alkali ions from eluting from the cut surface adjacent to the adhesive 110 in the glass member, the second ion elution preventing film 140 may be provided on the cut surface. The first elution preventing film 110 may be omitted.

  Moreover, it is needless to say that each of the embodiments described above can be applied to an inorganic EL display device in addition to the organic EL display device.

DESCRIPTION OF SYMBOLS 10 Substrate 11 One surface of substrate 12 End surface of substrate as cutting surface 50 Light emitting portion 100 Sealing member 101 One surface of sealing member 101a Convex portion 101b Concavity 102 End surface of sealing member as cutting surface 110 Adhesive 140 As elution prevention film No. 2 ion elution preventing film 300 wettability decreasing film

Claims (7)

A substrate (10);
A light emitting portion (50) formed on one surface (11) of the substrate (10) and including a light emitting layer made of an EL material;
A sealing member (100) that is disposed so that the one surface (101) side faces the one surface (11) of the substrate (10) and covers the light emitting section (50),
In the peripheral part of the light emitting part (50), one surface (11) of the substrate (10) and one surface (101) of the sealing member (100) are bonded via an adhesive (110), In the EL display device in which the light emitting unit (50) is sealed by the sealing member (100),
Both said substrate (10) and said sealing member (100) is configured as a glass member made of glass containing an alkaline component,
In addition to the one surface (11, 101) on which the adhesive (110) is disposed, the glass member (10, 100) is a surface adjacent to the adhesive (110) and the glass member (10, 100). 100) is provided with cut surfaces (12, 102) formed by cutting
On the cut surfaces (12, 102), an elution preventing film (140) for preventing the elution of alkali ions in the glass constituting the glass member is provided so as to cover the cut surfaces (12, 102). and,
Of the one surface (101) of the sealing member (100), the portion on which the adhesive (110) is disposed is adjacent to the convex portion (101a) with the one surface (101) as the convex portion (101a). A concave portion (101b) that is recessed from the convex portion (101a) is formed,
The adhesive (110) is bonded to one surface (11) of the substrate (10) at the convex portion (101a),
Further, the adhesive (110) protrudes from the convex portion (101a) so as to have a shape in which a base is widened from the convex portion (101a) to the concave portion (101b), and the adhesive (110) An EL display device characterized by covering a surface .   The anti-elution film (140) is formed by the adhesive protruding from the one surface (11, 101) of the glass member (10, 100) on which the adhesive (110) is disposed to the cut surface (12, 102). 110. The EL display device according to claim 1, wherein the EL display device is formed by 110). It is a manufacturing method of the EL display device according to claim 1 or 2 ,
After applying the adhesive (110) to one surface (101) of the sealing member (100), the substrate (10) is bonded through the adhesive (110), and then the adhesive (110). Are cured and bonded,
Before applying the adhesive (110), the wettability of the adhesive (110) to the surface of the recess (101b) formed on one surface (101) of the sealing member (100) is improved. A method for manufacturing an EL display device, characterized by performing a process for improving. In the state where the sealing member (100) is positioned on the lower side in the gravitational direction and the substrate (10) is positioned on the upper side in the gravitational direction, bonding with the adhesive (110) is performed, and the adhesive (110 The method of manufacturing an EL display device according to claim 3 , wherein curing is performed. Before applying the adhesive (110), a portion of the surface (11) of the substrate (10) that is in contact with the adhesive (110) is surrounded by a portion of the substrate (10) that is in contact with the adhesive (110). manufacturing method of an EL display device according to claim 3 or 4, wherein the wettability with respect to the adhesive (110) is coated with low wettability decreases membrane (300) than. It is a manufacturing method of the EL display device according to claim 1 or 2 ,
After applying the adhesive (110) to one surface (101) of the sealing member (100), the substrate (10) is bonded through the adhesive (110), and then the adhesive (110). Are cured and bonded,
In the state where the sealing member (100) is positioned on the lower side in the gravitational direction and the substrate (10) is positioned on the upper side in the gravitational direction, bonding with the adhesive (110) is performed, and the adhesive (110 ) Curing, an EL display device manufacturing method. It is a manufacturing method of the EL display device according to claim 1 or 2 ,
After applying the adhesive (110) to one surface (101) of the sealing member (100), the substrate (10) is bonded through the adhesive (110), and then the adhesive (110). Are cured and bonded,
Before applying the adhesive (110), a portion of the surface (11) of the substrate (10) that is in contact with the adhesive (110) is surrounded by a portion of the substrate (10) that is in contact with the adhesive (110). A method of manufacturing an EL display device, characterized by covering with a wettability reducing film (300) having lower wettability with respect to the adhesive (110).

Images