JP2006004708A - SEALING DEVICE, SEALING METHOD, ORGANIC EL DEVICE, AND ELECTRONIC DEVICE - Google Patents

Abstract

A sealing device capable of preventing a light-shielding glass and a substrate from sticking to each other and performing a sealing process using the light-shielding glass and easily peeling the substrate from the light-shielding glass. It is an object to provide a stopping method, an organic EL device, and an electronic apparatus.
A light shielding glass is disposed on the back side of a substrate on which an electro-optic layer is formed, and a sealing member for hermetically covering the substrate and the electro-optic layer is pressed against the light shielding glass. In a sealing device that irradiates light from the light-shielding glass side in a state and joins the substrate and the sealing member with a photocurable adhesive, in order to prevent the light-shielding glass and the substrate from sticking to each other In addition, minute unevenness is formed at the contact portion of the light shielding glass with the substrate.
[Selection] Figure 1-1

Description

  The present invention relates to a sealing device, a sealing method, an organic EL device, and an electronic device. Specifically, a light shielding glass is disposed on the back side of a substrate on which an electro-optical layer is formed, and the substrate and the electro-optical layer are arranged. A sealing device for sealing the substrate and the sealing member with a photo-curing adhesive by irradiating light from the light shielding glass side in a state where the sealing member for hermetically covering the substrate is pressed The present invention relates to a stopping method, an organic EL device, and an electronic apparatus.

  Organic EL panels using organic EL elements have attracted attention because they are self-luminous elements and do not require backlight illumination, have a wide viewing angle, and are suitable for large display panels.

  In such an organic EL panel, a transparent electrode having a predetermined pattern is formed on a transparent substrate, which is a support substrate made of a glass material, and an insulating layer, a hole injection layer, and a hole transport are formed on the transparent electrode. An organic layer is formed by sequentially laminating a layer, a light emitting layer, and an electron transport layer, an electron injection layer and a back electrode are laminated on the organic layer to obtain an organic EL element, and the organic EL element is sealed as a sealing member Is obtained by covering hermetically with air (see, for example, Patent Document 1).

  When such an organic EL element is exposed to the atmosphere, its light emission characteristics are significantly deteriorated by oxygen or water vapor. For this reason, the organic light-emitting film is sealed in an inert gas atmosphere after the film formation to reduce element deterioration and improve the lifetime. Sealing includes methods such as can sealing, thin film sealing, and resin sealing. Among them, can sealing, which has a simple process and high gas barrier properties, is widely used. As the sealing can, a glass / metal or the like having a high gas barrier property and a certain degree of rigidity is used.

  The flow of the sealing process will be described. (1) In the adhesive application step, an adhesive is applied to the sealing can. The application shape is such that the organic light-emitting film is sealed with an adhesive during bonding. (2) In the pressure bonding step, the sealing can is pressure bonded to the surface of the substrate on which the organic light emitting film is formed in an inert gas atmosphere. In this crimping step, a pressure is applied by placing a glass plate on the opposite side of the surface of the substrate on which the organic light emitting film is formed in order to press the sealing can against the substrate. (3) In the curing step, the adhesive is cured and sealed in a pressure-bonded state. The curing method includes UV curing and heat curing. In the curing step, when UV curing is performed, UV light is irradiated from the glass plate side. For this glass plate, in order to prevent the deterioration of the organic EL element due to UV light, a light-shielding glass in which a light-shielding mask is formed in a region other than the adhesive portion, particularly a light emitting region is often used.

JP 2004-79409 A

  However, when the light-shielding glass is pressed against the glass substrate, the two adhere to each other, and the glass substrate cannot be detached from the light-shielding glass only by its own weight. This is thought to be due to the fact that OH groups are arranged on the active glass surface, and a hydrogen bond is formed by pressing the two together, and cannot be removed by the bonding force. As described above, when the glass substrate adheres to the light-shielding glass, problems such as “the substrate cannot be flowed to the next process” and “breakage occurs by forcibly removing the glass substrate” occur.

  The present invention has been made in view of the above problems, and when performing a sealing process using light-shielding glass, the light-shielding glass and the substrate are prevented from sticking, and the substrate can be easily made from the light-shielding glass. It is an object of the present invention to provide a sealing device, a sealing method, an organic EL device, and an electronic device that can be peeled apart.

  In order to solve the above-described problems and achieve the object, the present invention provides a light-shielding glass on the back side of the substrate on which the electro-optic layer is formed, and the substrate in order to hermetically cover the electro-optic layer. With the substrate and the sealing member being cured by irradiating light from the light-shielding glass side and curing the photocurable adhesive in a state where the sealing member and the sealing member are pressed through a photocurable adhesive In the sealing device for joining the light shielding glass and the substrate, in order to prevent the light shielding glass and the substrate from sticking, a minute unevenness is formed on the contact portion of the light shielding glass with the substrate. Features.

  As a result, in the state in which the substrate is pressed against the light shielding glass, (1) the area in contact with the active glass surface decreases, and accordingly, the bonding force of hydrogen bonds also decreases, and (2) it is formed on the light shielding glass. When the contact is released, there is a gap between the substrate and the light-shielding glass when the contact is released, so there is a gap between the substrate and the light-shielding glass. Can be peeled off. When performing a sealing process using light-shielding glass, it is possible to provide a sealing device capable of preventing the light-shielding glass and the substrate from sticking and easily separating the substrate from the light-shielding glass. It becomes possible.

  Moreover, according to a preferable aspect of the present invention, it is desirable that the minute unevenness is formed by a spacer. Thereby, it becomes possible to form minute irregularities on the light-shielding glass by a low-cost and simple method.

  Moreover, according to a preferable aspect of the present invention, it is desirable that the minute unevenness is formed by a frosted glass treatment. Thereby, it becomes possible to form minute irregularities on the light-shielding glass by a low-cost and simple method.

  According to a preferred aspect of the present invention, it is desirable that the electro-optical layer is formed of an organic layer having at least a light emitting layer, and an organic EL device is manufactured using the sealing device of the present invention. Thereby, when performing the sealing process of an organic EL apparatus with the sealing apparatus of this invention, it becomes possible to peel a board | substrate from light shielding glass easily.

  According to a preferred aspect of the present invention, it is desirable to mount the organic EL device of the present invention on an electronic device. Thereby, when performing the sealing process of the organic EL apparatus mounted in an electronic device with the sealing apparatus of this invention, it becomes possible to peel a board | substrate from light shielding glass easily.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

(Sealing device)
FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a sealing device 1 according to an embodiment of the present invention. FIG. 1-1 shows a state before crimping, and FIG. 1-2 shows a state after crimping. ing. In the following examples, the case where the substrate (organic EL substrate) on which the organic EL layer (electro-optical layer) is formed by the sealing device 1 is sealed with a sealing can will be described. Further, a case where four faces are taken on a glass substrate (organic EL substrate) will be described as an example.

  1-1, 11 is a chamber, 12 is a vacuum pump for evacuating the inside of the chamber, 13 is a nitrogen inlet, 14 is held by a holding member (not shown), and is a light shielding glass on which a light shielding mask 15 is formed. A glass substrate (organic EL substrate) on which an organic EL layer (electro-optic layer) 17 is formed, 18 is a sealing can (sealing member) for hermetically covering the organic EL layer 17, and 19 is a sealing can 18. UV curable adhesive applied to the joint portion, 20 is a sealing can jig for placing the sealing can 18, 21 is a substrate support portion for placing the glass substrate 16, and 22 is a sealing can jig 20. , A sealing can jig supporting portion 23, 23 is a pressure-bonding stage configured to be stretchable so that the sealing can 18 and the glass substrate 17 are pressed against the light shielding glass 14, and 30 is an ultraviolet irradiation device.

  A crimping stage 23 configured to be extendable and moving the sealing can jig 20 upward is provided in the lower part of the chamber 11. Above the crimping stage 23, the sealing can jig 20 placed on the sealing can jig support 22 is disposed. Four sealing cans 18 are placed on the sealing can jig 20. A UV curable adhesive 19 is applied to the joint portion of each sealing can 18. Above the sealing can jig 20, the glass substrate 16 is placed on the substrate support portion 21 with the organic EL layer 18 facing downward. A light shielding glass 14 held by a holding member (not shown) is arranged on the back side (upper side) of the glass substrate 16.

  The chamber 11 is provided with an exhaust port 12 a for evacuating the chamber 11 with a vacuum pump 12. Further, the chamber 11 is provided with a nitrogen inlet 13 through which nitrogen is introduced in order to make the inside a nitrogen atmosphere. Instead of nitrogen, another inert gas such as argon or helium may be used. On the upper side of the chamber 11, an ultraviolet irradiation device 30 for irradiating ultraviolet rays is disposed on the upper side of the chamber 11 in order to bond the glass substrate 16 and the sealing can 18 via the UV curable adhesive 19. .

  2 is a diagram for explaining the configuration of the light shielding glass 14, FIG. 2-1 is a plan view showing a glass substrate side surface 14a of the light shielding glass 14, and FIG. 2-2 is an A- A sectional view is shown. As shown in FIG. 2A, the light shielding glass 14 has four light shielding mask patterns 15 made of Cr or the like, and a plurality of spacers 31 for forming minute irregularities on the light shielding glass 14. The spacer 31 is formed around each light shielding mask pattern 15. As shown in FIG. 2B, minute unevenness is formed on the light shielding glass 14 by the spacer 31. A PI (polyimide) tape or the like can be used for the spacer 31. Further, the spacer 31 may be formed by a convex portion obtained by processing the surface of the light shielding glass 14. The spacers 31 may have any number, arrangement, or shape as long as they do not significantly affect the pressure distribution of the UV curable adhesive 19 during pressure bonding.

(Sealing method)
A sealing method by the sealing device 1 having the above configuration will be described. First, in FIG. 1-1, the inside of the chamber 11 is exhausted by the vacuum pump 12 through the exhaust port 12a so that the inside of the chamber 11 is in a substantially vacuum state, and nitrogen is introduced from the nitrogen introduction port 13 to make the inside of the chamber 11 a nitrogen atmosphere. . Thereafter, as shown in FIG. 1-2, the sealing can jig 20 is raised by the pressure-bonding stage 23, and the light shielding glass 14 in which the sealing can 18 and the glass substrate 16 are fixedly supported by a support member (not shown). Press to press. In this way, after the sealing can 18 is brought into contact with the glass substrate 16 with a predetermined pressure applied, the ultraviolet rays from the ultraviolet irradiation device 30 are passed through the light shielding glass 14 and the UV curable adhesive. By irradiating the coating position 19, the UV curable adhesive 19 is cured and the sealing can 18 is sealed to the glass substrate 16.

  Thereafter, the crimping stage 23 is lowered to place the glass substrate 16 on the substrate support portion 21, and the sealing can jig 20 is placed on the sealing can jig support portion 22. In this case, in the state where the glass substrate 16 is brought into contact with the light-shielding glass 14 by applying pressure, (1) since the area in contact with the active glass surface decreases, the hydrogen bonding force also decreases accordingly. (2) Because the spacer 31 formed on the light-shielding glass 14 causes a slight bend in the glass substrate 16 and the contact is released, a gap is generated between the glass substrate 16 and the light-shielding glass 14 in order to return the bend. The glass substrate 16 can be easily peeled off without the glass substrate 16 sticking to the light shielding glass 14.

(Modification of shading glass)
FIG. 3 is a plan view showing a modified example of the light shielding glass 14. In the above embodiment, the spacer 31 is formed in order to form minute irregularities in the contact portion between the light shielding glass 14 and the glass substrate 16, but the present invention is not limited to this. As shown in FIGS. 3A and 3B, a frosted glass treatment may be performed. In the same figure, 40 has shown the frosted glass processing area | region where the frosted glass process was performed. FIG. 3A shows a case where the polished glass treatment is performed around the four light shielding mask patterns 15, and FIG. 3-2 shows a case where the polished glass processing is performed around each of the light shielding mask patterns 15. Show. In order to prevent the light-shielding glass 14 and the glass substrate 16 from sticking, it is desirable to form the polished glass processing region 50 large.

  According to the above embodiment, in order to prevent the light shielding glass 14 and the glass substrate 16 from sticking to each other, minute irregularities are formed in the contact portion between the light shielding glass 14 and the glass substrate 16. The glass substrate 16 can be easily peeled off without being attached to the glass substrate 16. In this embodiment, a glass substrate is used as the organic EL substrate. However, the present invention can be applied even when other materials such as a Si substrate and a ceramic substrate are used.

(Organic EL device)
FIG. 4 is a diagram showing a cross-sectional structure of the organic EL device 100 according to the embodiment of the present invention. The organic EL device 100 according to the embodiment is a bottom emission type organic EL device using a sealing can 105. In FIG. 4, 101 is a glass substrate, 102 is a transparent anode (first electrode), 103 is an organic EL layer (electro-optic layer) including a light emitting layer made of an organic compound, 104 is a reflective cathode (second electrode), 105 is A sealing can (sealing member) 106 indicates a UV curable adhesive.

  A switching element such as TFT or TFD is formed on the glass substrate 101 as necessary. A transparent anode 102 made of ITO is formed on the upper surface of the glass substrate 101. On the transparent anode 102, an organic EL layer 103 including a light emitting layer made of an organic compound is formed. The organic EL layer 103 is a single layer type (light emitting layer), two layer type (light emitting layer + electron transport layer / hole transport layer), three layer type (electron transport layer / light emitting layer / hole transport layer), four layer type ( Any of five types (electron injection layer / electron transport layer / light emitting layer / hole transport layer / hole injection layer) may be used. The organic EL layer 103 can be formed using an inkjet method. A transparent cathode 104 made of ITO is formed on the organic EL layer 103.

  Then, in order to hollow seal the transparent anode 102, the organic EL layer 103, and the reflective cathode 104, a sealing can 105 that is a sealing member is bonded to the glass substrate 101 with a UV curable adhesive 106. More specifically, using the sealing device 1 of the present invention, a UV curable adhesive 106 is applied to the joint surface of the sealing can 105, the glass substrate 101 is stacked in a nitrogen atmosphere, and then irradiated with ultraviolet rays. Then, the UV curable adhesive 106 is cured, and the sealing can 105 and the glass substrate 101 are joined. As the sealing can 105, for example, a glass sealing can for hollow sealing can be used. Note that quartz, acrylic, silicon, plastic, or the like may be used for the sealing can 105 instead of glass.

  The sealing can 105 is filled with a desiccant 105 a in order to efficiently adsorb moisture and gas entering the hollow interior of the organic EL device 100. The shape of the sealing can 105 is not particularly limited as long as the first electrode 102, the organic EL layer 103, and the second electrode 104 can be sealed. For example, a rectangular parallelepiped, a rectangular parallelepiped, a cylinder, The shape may be conical, hemispherical or the like. As the desiccant 105a, a material having a high water absorption capability due to its chemical adsorption property can be used, and for example, barium oxide, diphosphorus pentoxide, calcium oxide and the like are preferable.

(Modification of organic EL device)
FIG. 5 is a diagram illustrating a cross-sectional structure of an organic EL device 200 according to a modification. 5, parts having the same functions as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. In the said Example, it is the structure which uses the sealing can 105 as a sealing member. On the other hand, a modification is the structure which uses the board | substrate 201 for sealing as a sealing member. Even in the organic EL device according to the modification, the sealing step can be performed using the sealing device 1 of the present invention. In FIG. 5, a UV curable adhesive 106 is applied to the bonding surface (peripheral portion) of the sealing substrate 201, and the substrate 101 is stacked in a nitrogen atmosphere, and then heated or irradiated with ultraviolet rays, thereby UV curable adhesive. 106 is cured to bond the sealing substrate 201 and the substrate 101 together. A groove is formed in the sealing substrate 201, and this groove is filled with a desiccant 105a. For the sealing substrate 201, for example, glass, quartz, acrylic, silicon, plastic, or the like can be used.

(Application example to electronic equipment)
Next, specific examples of electronic devices to which the organic EL device according to the present invention can be applied will be described with reference to FIG. FIG. 6A is a perspective view showing an example in which the organic EL device according to the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) 300. As shown in the figure, the personal computer 300 includes a main body 302 provided with a keyboard 301 and a display unit 303 to which the organic EL device according to the present invention is applied. FIG. 6B is a perspective view illustrating an example in which the organic EL device according to the present invention is applied to the display unit of the mobile phone 400. As shown in the figure, the cellular phone 400 includes a plurality of operation buttons 401, a receiving mouth 402, a mouthpiece 403, and a display unit 404 to which the organic EL device according to the present invention is applied.

  The organic EL device according to the present invention includes a portable information device called PDA (Personal Digital Assistants), a personal computer, a workstation, a digital still camera, an in-vehicle monitor, a digital video camera, in addition to the above-described cellular phone and notebook computer. Can be widely applied to electronic devices such as liquid crystal televisions, viewfinder type, monitor direct view type video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, word processors, workstations, video phones, and POS terminals. .

  The organic EL device of the present invention can be widely used for organic EL display devices, electrochromic glass, electronic paper, lighting devices, printer heads, and the like. The electronic device according to the present invention includes a mobile phone, a portable information device called PDA (Personal Digital Assistants), a portable personal computer, a personal computer, a workstation, a digital still camera, an in-vehicle monitor, a digital video camera, and a liquid crystal display. It can be widely used in electronic devices such as televisions, viewfinder type, monitor direct view type video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, word processors, workstations, video phones, and POS terminals. The image forming apparatus according to the present invention can be widely used in image forming apparatuses such as a printer, a copying machine, a facsimile machine, and a digital multifunction machine.

The typical sectional view showing the schematic structure of the sealing device concerning the example of the present invention (state before pressure bonding). The typical sectional view showing the outline composition of the sealing device concerning the example of the present invention (state after pressure bonding). The top view which shows the glass substrate side surface of light-shielding glass. AA sectional drawing of FIGS. 2-1. The top view which shows the modification of light shielding glass. The top view which shows the modification of light shielding glass. Sectional drawing of the organic electroluminescent apparatus which concerns on the Example of this invention. Sectional drawing of the organic electroluminescent apparatus which concerns on the modification of this invention. The perspective view of the personal computer provided with the organic electroluminescent apparatus which concerns on an Example. The perspective view of the mobile telephone provided with the organic electroluminescent apparatus which concerns on an Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 Chamber, 12 Vacuum pump, 13 Nitrogen inlet, 14 Light shielding glass, 15 Light shielding mask pattern 16 Glass substrate (organic EL substrate), 17 Organic EL apparatus (electro-optic layer), 18 Sealing can, 19 UV curable adhesive , 20 Sealing can jig, 21 Substrate support part, 22 Sealing can jig support part, 23 Crimping stage, 30 Ultraviolet irradiation device, 31 Spacer, 40 Polished glass processing area, 100 Organic EL device, 101 Substrate, 102 Reflection Anode (first electrode), 103 organic EL layer, 104 transparent cathode (second electrode), 105 sealing can, 106 UV curable adhesive, 200 organic EL device, 201 sealing substrate, 300 computer, 301 keyboard, 302 Body, 303 Display, 400 Mobile phone, 401 Operation buttons, 402 Earpiece, 403 Send Mouth, 404 display

Claims (8)

A state in which a light-shielding glass is disposed on the back side of the substrate on which the electro-optic layer is formed, and the substrate and the sealing member are press-contacted via a photo-curing adhesive in order to hermetically cover the electro-optic layer In the sealing device for joining the substrate and the sealing member by irradiating light from the light-shielding glass side and curing the photocurable adhesive,
In order to prevent sticking of the said light shielding glass and the said board | substrate, the micro unevenness | corrugation was formed in the contact part with the said board | substrate of the said light shielding glass, The sealing device characterized by the above-mentioned.   The sealing device according to claim 1, wherein the minute unevenness is formed by a spacer.   The sealing device according to claim 1, wherein the minute unevenness is formed by a frosted glass treatment.   The organic EL device, wherein the electro-optical layer is formed of an organic layer having at least a light emitting layer, and is manufactured by the sealing device according to any one of claims 1 to 3.   An electronic apparatus comprising the organic EL device according to claim 4. A light-shielding glass is disposed on the back side of the substrate on which the electro-optic layer is formed, and the substrate and the sealing member are in pressure contact with each other via a photocurable adhesive in order to hermetically cover the electro-optic layer. In the sealing method of joining the substrate and the sealing member by irradiating light from the light shielding glass side to cure the photocurable adhesive,
In order to prevent sticking of the said light shielding glass and the said board | substrate, the micro unevenness | corrugation was formed in the contact part with the said board | substrate of the said light shielding glass, The sealing method characterized by the above-mentioned.   The sealing method according to claim 6, wherein the minute unevenness is formed by a spacer.   The sealing method according to claim 6, wherein the minute unevenness is formed by a frosted glass treatment.

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