JP2010140915A - Display device, and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device retaining reliability for a long period of time by suppressing deterioration of a light emitting element due to moisture. <P>SOLUTION: A sealing resin 13 is filled between a substrate 1 and a plate type sealing substrate 14 so as to cover the whole surface of a display region 10. A getter agent layer 21 is provided throughout the whole periphery so as to cover a boundary face between the substrate 1 and the sealing resin 13, a boundary face between the sealing resin 13 and the sealing substrate 14, and the exposed part of the sealing resin 13 on its periphery. The getter agent layer 21 is formed by using a material to catch at least either one of moisture and oxygen. A sealing layer 23 is also provided so as to cover the getter agent layer 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device and a manufacturing method thereof, and more particularly to a display device in which a light emitting element is provided in a sealing portion and a manufacturing method thereof.

  In recent years, the importance of human-machine interfaces, such as multimedia-oriented products, has increased. In order for humans to operate the machine more comfortably and efficiently, it is necessary to extract a sufficient amount of information from the machine to be operated without error, in a concise and instantaneous manner. Research has been conducted on display elements.

  In addition, with the miniaturization of machines, the demand for miniaturization and thinness of display elements is increasing day by day. For example, there has been a remarkable progress in downsizing laptop information processing devices that are integrated with a display element such as a notebook personal computer and a notebook word processor. The technological innovations related to LCDs are wonderful. Liquid crystal displays are used as an interface for various products, and are often used in products that we use everyday, such as laptop TVs, watches, and calculators, as well as laptop information processing equipment. ing.

  However, since a liquid crystal display is not self-luminous, it requires a backlight, and this backlight drive requires more power than driving a liquid crystal. Further, since the viewing angle is narrow, it is not suitable for a large display element such as a large display. Furthermore, since the display method is based on the alignment state of the liquid crystal molecules, the contrast changes depending on the angle even within the viewing angle. In addition, since the liquid crystal displays using the change in the molecular conformation in the ground state, the dynamic range cannot be widened. This is one of the reasons why the liquid crystal display is not suitable for displaying moving images.

  On the other hand, plasma display elements, inorganic electroluminescent elements, organic electroluminescent elements and the like have been studied as self-luminous display elements.

  A plasma display element uses plasma light emission in a low-pressure gas for display and is suitable for an increase in size and capacity, but has problems in terms of thickness reduction and cost. In addition, a high voltage AC bias is required for driving, which is not suitable for portable devices.

  As the inorganic electroluminescent element, a green light emitting display or the like has been commercialized. However, like the plasma display element, it is an AC bias drive and requires several hundred volts for the drive, and has not been accepted by the user. However, due to technological development, the three primary colors required for color display display have been successfully emitted today, but there are not many blue light emitting materials that can emit light with high brightness and long life. Because of the material, it is difficult to control the emission wavelength by molecular design and the like, and it seems difficult to make a full color device for consumers.

  On the other hand, the electroluminescence phenomenon due to organic compounds has been studied for a long time since the discovery of the light emission phenomenon due to carrier injection into the anthracene single crystal that emits fluorescence strongly in the first half of the 1960s. Moreover, since it was a single crystal, it was conducted as a basic study of carrier injection into an organic material.

  However, since Tang et al. Of Eastman Kodak in 1987 announced an organic electroluminescent device with a laminated structure with an amorphous light emitting layer that can drive at low voltage and emit high brightness, light emission and stability of RGB primary colors in various directions Research and development on brightness increase, laminated structure, manufacturing method, etc. are actively conducted.

  In addition, various new materials were invented by molecular design, which is a characteristic of organic materials, and applied research to color displays of organic electroluminescent elements having excellent characteristics such as direct current low voltage drive, thinness, and self-luminous property It is starting to take place actively.

  FIG. 14 shows a configuration example of such a light emitting element (organic electroluminescent element). The light emitting element shown in this figure is provided on a transparent substrate 1 made of, for example, glass. This light emitting element 2 is provided with a lower electrode 3 made of ITO provided as an anode electrode, a hole transport layer 4, a light emitting layer 5 and an electron transport layer 6 sequentially laminated on the lower electrode 3, and further on the upper part. And an upper electrode 7 serving as a cathode electrode. In the light emitting element 2 configured as described above, light generated when electrons injected from the cathode electrode and holes injected from the anode electrode are recombined in the light emitting layer 5 is extracted from the substrate 1 side.

  By the way, in order to apply an organic electroluminescent element to a color display, stable light emission of RGB three primary colors is an indispensable condition. However, when the organic electroluminescence device is driven for a long time, a non-emission point called a dark spot is generated, and the growth of the dark spot is one of the causes for shortening the lifetime of the organic electroluminescence device.

  It is known that a dark spot is generally generated in a size that cannot be seen with the naked eye immediately after driving, and grows by continuous driving using this as a core. Further, it is known that dark spots are generated even in a storage state in which driving is not performed and grow with time.

  There are various causes for the dark spot, but external factors include crystallization of the organic layer due to the penetration of moisture and oxygen into the device, peeling of the cathode metal electrode, and the like. As internal factors, a short due to cathode metal crystal growth, crystallization and deterioration of the organic layer due to heat generated by light emission, and the like are considered as dark spot factors.

  Accordingly, in a display device using the light emitting element having such a configuration, for example, as shown in FIG. 15, a region (namely, referred to as a display region) 10 on the substrate 1 on which the light emitting elements 2 are arranged and formed is a concave storage portion. The sealing cap 11 is covered, and the sealing resin 12 is filled between the sealing cap 11 and the substrate 1 over the entire periphery. Thus, the hollow portion a between the sealing cap 11 and the substrate 1 is kept airtight, and the display region 10 is sealed in the hollow portion a.

  Further, as shown in FIG. 16, the display region 10 on the substrate 1 is covered with a sealing resin 13, and a flat sealing substrate 14 is provided so as to face the substrate 1 with the sealing resin 13 sandwiched therebetween. Thus, the display region 10 is sealed in the sealing resin 13 filled between the substrate 1 and the sealing substrate 14.

  However, in the display device having the configuration shown in FIG. 15, the periphery of the substrate 1 and the sealing cap 11 is filled with the sealing resin 12 so that the inside of the hollow portion a in which the display region 10 is accommodated is hermetically sealed. However, intrusion of outside air from the interface between the substrate 1 and the sealing cap 11, that is, the interface between the sealing resin 12 and the substrate 1 and the interface between the sealing cap 11 and the sealing resin 12 cannot be completely prevented. .

  Therefore, there is a configuration in which a getter agent that traps moisture and oxygen is provided on the inner wall of the sealing cap 11 in order to prevent deterioration of the light emitting element 9 due to moisture in the outside air that has entered the hollow a portion. However, even when a getter agent is provided on the inner wall of the sealing cap 11, moisture and oxygen in the outside air that has once entered the hollow portion a are trapped by the getter agent. It is impossible to prevent the provided display area 10 from being exposed to moisture or oxygen.

  Also in the display device having the configuration shown in FIG. 16, the display region 10 is sealed in the sealing resin 13 by filling the sealing resin 13 between the substrate 1 and the sealing substrate 14. However, intrusion of outside air from the interface between the substrate 1 and the sealing resin 13 and from the interface between the sealing substrate 14 and the sealing resin 13 cannot be completely prevented, and the light-emitting element 2 due to moisture or oxygen in the outside air cannot be prevented. Deterioration cannot be prevented.

  The present invention has been made in response to such a problem, and prevents the light-emitting element provided in the display region from being exposed to moisture and oxygen, thereby suppressing deterioration of the light-emitting element. It is an object of the present invention to provide a display device that can be stored and can stably emit light for a long time.

  In order to achieve such an object, a display device of the present invention includes a substrate, a light emitting element formed on the substrate, and a sealing member arranged to face the substrate with the light emitting element sandwiched therebetween. A first display device comprising a substrate and a sealing member in which a light emitting element is sealed, and the first display device has moisture and oxygen in the vicinity of a sealing portion interface between the substrate and the sealing member. A getter agent layer for capturing at least one of them is provided.

  In the first display device having such a structure, moisture or oxygen in the outside air that is about to enter the light emitting element side from the sealing portion interface between the substrate and the sealing member, or moisture in the outside air that has entered the light emitting element side. And oxygen are trapped in the getter agent layer provided near the interface. Therefore, it is possible to prevent moisture and oxygen in the outside air from diffusing to the light emitting element side and exposing the light emitting element to moisture and oxygen in the outside air.

  When this getter agent layer is filled in a recess provided in the substrate portion in the vicinity of the inner periphery of the interface between the substrate and the sealing member, outside air enters from the interface between the substrate and the sealing member. Even so, moisture and oxygen in the outside air are captured by the getter agent layer before diffusing to the light emitting element side.

  In addition, when the getter agent layer is provided in a state of covering the outer peripheral side exposed portion of the sealing portion interface between the substrate and the sealing member, intrusion of outside air from the sealing portion interface between the substrate and the sealing member is prevented. Can be prevented. Furthermore, when a sealing layer is provided in a state of covering the getter agent layer, moisture and oxygen are prevented from being supplied to the getter agent layer, so that moisture and oxygen are trapped in the getter agent layer. It is not a source of moisture or oxygen.

  Further, in the second display device of the present invention, a recess is provided on the opposite surface side of the peripheral edge portion of at least one of the substrate and the sealing member, and the space between the substrate and the sealing member is sealed in the recess. The sealing resin is filled.

  In the second display device having such a configuration, the interface between the sealing portion of the substrate and the sealing member, that is, the interface between the substrate and the sealing member and the sealing resin, and further, the inside of the sealing resin toward the light emitting element side. When the outside air diffuses and enters, a concave portion is disposed on the diffusion path. For this reason, the diffusion direction of the outside air is dispersed in the recess, and the outside air hardly reaches the light emitting element side. Accordingly, moisture and oxygen in the outside air can be prevented from being supplied to the light emitting element.

  Further, the sealing resin filled in the recess may contain a getter agent that captures at least one of moisture and oxygen. Further, such a getter agent layer may be provided on the inner wall of the recess. With such a configuration, moisture and oxygen in the outside air that has penetrated into the recess due to diffusion are trapped in the getter agent and the getter agent layer in the recess. Therefore, it is possible to reliably prevent the moisture and oxygen from being further diffused and supplied to the light emitting element side.

  The configurations of the second display device and the first display device may be combined.

  Further, the third display device of the present invention is characterized in that a recess is formed in a sealing surface portion of the substrate with the sealing member. Even in the third display device having such a configuration, when the outside air diffuses and enters the interface between the substrate and the sealing member toward the light emitting element side, the concave portion is arranged on the diffusion path. Therefore, the diffusion direction of the outside air is dispersed in the recess, and the outside air hardly reaches the light emitting element side. Accordingly, moisture and oxygen in the outside air can be prevented from being supplied to the light emitting element. The configuration of the third display device and the first display device may be combined.

  In addition, in the method for manufacturing a display device of the present invention for achieving the above-described object, a light emitting element is formed on a substrate, and then a sealing member is provided to face the substrate in a state where the light emitting element is sandwiched. A method for manufacturing a display device in which a light emitting element is sealed between a sealing member and a sealing member, wherein the first manufacturing method is a step of forming a recess in the vicinity of a sealing portion interface in at least one of a substrate and a sealing substrate. And a step of filling the recess with a getter agent layer that traps at least one of moisture and oxygen.

  Moreover, the 2nd manufacturing method of this invention is the state which covers the outer peripheral side exposed part of the sealing part interface of the said board | substrate and a sealing member, after sealing the said light emitting element between a board | substrate and a sealing member. And a step of providing a getter agent layer that captures at least one of moisture and oxygen. Moreover, you may perform the process of covering this getter agent layer with a sealing layer.

  Further, in the third manufacturing method, before the light emitting element is sealed between the substrate and the sealing member, a recess is formed on the periphery of at least one of the substrate and the sealing member, and the substrate and the sealing are formed in the recess. A step of filling a sealing resin for sealing the light emitting element between the members is performed. The recess may be filled with a sealing resin containing a getter agent that captures at least one of moisture and oxygen. Further, such a getter agent layer may be formed on the inner wall of the recess before filling the recess with the sealing resin.

  Moreover, the 4th manufacturing method of this invention is the process of drilling a recessed part in the sealing surface part with the sealing member in the periphery of a board | substrate, before sealing a light emitting element between a board | substrate and a sealing member. It is characterized by performing.

  As described above, according to the display device of the present invention, intrusion of moisture and oxygen from the sealing portion interface between the sealing member such as the sealing substrate and the sealing cap and the substrate on which the light emitting element is formed is effective. Can be prevented. As a result, it is possible to obtain a display device in which the light emitting element sealed between the sealing member and the substrate is prevented from being deteriorated by moisture or oxygen, can be stored for a long time, and can emit light stably for a long time. In particular, in a display device using an organic electroluminescent element that is significantly deteriorated by moisture or oxygen as a light emitting element, it is possible to effectively prevent the generation of dark spots due to the deterioration of the organic electroluminescent element. Can be improved.

It is a figure which shows the example of 1 structure of the organic electroluminescent element used for the display apparatus of embodiment. It is a figure which shows the structure of the display apparatus of 1st Embodiment. It is a top view which shows the structure of the display apparatus of 1st Embodiment. It is a figure which shows the modification of the display apparatus of 1st Embodiment. It is a figure which shows the further another modification of the display apparatus of 1st Embodiment. It is a figure which shows the structure of the display apparatus of 2nd Embodiment. It is a figure which shows the structure of the display apparatus of 3rd Embodiment. It is a figure which shows the modification of the display apparatus of 3rd Embodiment. It is a figure which shows the structure of the display apparatus of 4th Embodiment. It is a structural formula of TPD used for the positive hole transport layer in the Example. It is a structural formula of Alq3 used for the electron transport light emitting layer in an Example. It is a structural formula of m-MTDATA used for the hole injection layer in the examples. It is structural formula of (alpha) -NPD used for the positive hole transport layer in the Example. It is a figure which shows the structure of an organic electroluminescent element. It is a figure which shows the example of 1 structure of the conventional display apparatus. It is a figure which shows the other structural example of the conventional display apparatus.

  Hereinafter, embodiments of a display device and a manufacturing method thereof according to the present invention will be described in detail with reference to the drawings.

  Here, each embodiment of a display device using an organic electroluminescent element as a light emitting element will be described. However, the display device of the present invention is not limited to those using organic electroluminescence elements as light emitting elements, and is widely applied to display devices using self-luminous light emitting elements such as inorganic electroluminescence elements. Is possible.

  First, before describing each embodiment, the structure of the organic electroluminescent element used for the display apparatus of these embodiment is demonstrated. The organic electroluminescent element is configured in the same manner as described in the prior art, for example. That is, as shown in FIG. 1, a transparent lower electrode 3 made of ITO formed by sputtering on a transparent substrate 1 made of glass or the like, and hole transport sequentially stacked on the lower electrode 3 by vacuum deposition. The layer 4, the light emitting layer 5, the electron transport layer 6 and the upper electrode 7 constitute the organic electroluminescent element 2. The lower electrode 3 is used as an anode electrode, for example, and the upper electrode 7 is used as a cathode electrode.

  Moreover, the organic electroluminescent element used for the display apparatus of this invention is not limited to such a structure. In the following embodiments, since the case where the display device is a “transmission type” in which emitted light is extracted from the substrate 1 side will be described as an example, the substrate 1 needs to be made of a transparent material. However, the display device of the present invention may be a “top surface emission type” in which emitted light is extracted from the side opposite to the substrate 1. In this case, the substrate 1 is not limited to a transparent material. A metal substrate, a substrate on which a TFT (thin film transistor) is formed, or the like may be used.

  The lower electrode 3 is not limited to being used as an anode electrode, and may be used as a cathode electrode. Similarly, the upper electrode 7 is not limited to be used as a cathode electrode, and is used as an anode electrode when the lower electrode 3 is used as a cathode electrode. However, in the case of a transmissive display device, the lower electrode 3 is made of a transparent material, and in the case of a top emission type display device, the upper electrode 7 is made of a transparent material.

  As the cathode electrode material, in order to inject electrons efficiently, a metal having a small work function from the vacuum level of the electrode material is preferably used. For example, indium (In), magnesium (Mg), silver (Ag) A metal having a small work function such as calcium (Ca), barium (Ba), or lithium (Li) may be used alone or as an alloy with another metal with increased stability.

  On the other hand, as an anode electrode material, in order to inject holes efficiently, those having a large work function from the vacuum level of the electrode material, such as gold (Au), tin oxide (SnO2) and antimony (Sb) An alloy, an alloy of zinc oxide (ZnO) and aluminum (Al), or the like is used.

  A light emitting layer 5 made of at least an organic material is provided between the lower electrode 3 and the upper electrode 7, and a hole transport layer and an electron transport layer are formed on the upper surface or the lower surface of the light emitting layer 5 as necessary. Further, organic layers such as an electron injection layer are arranged in an appropriately selected order. Moreover, there is no limitation condition in the material which comprises each layer, For example, if it is a hole transport layer, hole transport materials, such as a benzidine derivative, a styrylamine derivative, a triphenylmethane derivative, a hydrazone derivative, can be used.

  Each of these organic layers may have a laminated structure including a plurality of layers, and the light emitting layer 5 may be a hole transporting light emitting layer or an electron transporting light emitting layer.

  Furthermore, for the purpose of controlling the emission spectrum of the light emitting layer, co-evaporation of trace molecules may be performed, and for example, an organic thin film containing a trace amount of organic substances such as berylene derivatives, coumarin derivatives, and pyran dyes may be used.

  In such a light emitting element, an insulating film 7 is provided around the lower electrode 3, and a sealing layer 8 is provided so as to cover these constituent materials. The sealing layer 8 is made of, for example, nitride, germanium oxide, or the like, and serves as a protective film for the light emitting element 2. For example, the light emitting element 2 such as a resin material (for example, an adhesive or a sealing resin) is used. It is intended to prevent intrusion.

  Next, each embodiment of the display apparatus using the organic electroluminescent element having the above-described configuration will be described.

(First embodiment)
FIG. 2 is a main part configuration diagram of the display device of the first embodiment. The difference between the display device shown in this figure and the conventional display device is that moisture and oxygen are present in the vicinity of the interface between the sealing portion between the substrate 1 and the sealing cap (ie, the sealing member shown in the claims) A getter agent layer 21 for capturing at least one of them is provided. Note that the organic electroluminescent elements (2) having the above-described configuration are arranged in the central display area 10 on the substrate 1.

  The sealing cap 11 is formed of, for example, stainless steel, and a central portion is molded into a concave shape for accommodating the display area 10. Further, the edge portion is bent outward over the entire circumference to form a sealing surface A, and this sealing surface A is a sealing portion with the substrate 1. Although illustration is omitted here, a getter agent that traps moisture may be provided on the inner wall of the sealing cap 11. When the display device is a transmissive type, the sealing cap 11 is made of a transparent material such as glass.

  Moreover, the board | substrate 1 and the sealing cap 11 are adhesively sealed with the sealing resin 12 over the perimeter of the peripheral part, for example. As the sealing resin 12, for example, an ultraviolet curable resin (UV resin), a two-component mixed epoxy resin, a thermosetting resin, or the like is used.

  And the getter agent layer 21 is provided in the state which covers the outer peripheral side exposed part of the sealing part interface of the board | substrate 1 and the sealing cap 11. FIG. Here, as also shown in the plan view of FIG. 3, the getter agent layer 21 is provided in a state in which the outer peripheral side exposed portion of the interface between the substrate 1, the sealing cap 11 and the sealing portion is preferably continuously covered over the entire circumference. It is assumed that

  Specifically, the getter agent layer 21 is entirely covered with the interface between the substrate 1 and the sealing resin 12, the sealing resin 12, and the outer peripheral exposed portion of the interface between the sealing resin 12 and the sealing cap 11. It shall be provided over the circumference.

  The getter agent layer 21 is formed of, for example, a material that adsorbs moisture or oxygen as a getter agent and is formed of the getter agent, or such getter agent particles are dispersed in a material that can be an adhesive. It may be. Here, as a getter agent for the purpose of capturing moisture, a material having an effect of adsorbing moisture such as CaO (calcium oxide), BaO (barium oxide), silicon oxide (SiO2) and calcium chloride (CaCl2). In addition, materials that easily react with water, such as alkali metals and alkaline earth metals, such as materials that physically and chemically adsorb moisture, and that are difficult to be liquid (preferably not liquid) can be used, The material that can be used is not limited by the adsorption mechanism. In addition, as a getter agent for the purpose of capturing oxygen, an activated metal material such as Ba (barium), Ca (calcium), Ti (titanium), or the like can be used. The getter agent layer 21 contains at least one of the getter agent that adsorbs moisture and the getter agent that adsorbs oxygen.

  Further, a sealing layer 23 is provided so as to cover such a getter agent layer 21. The sealing layer 23 is made of a resin material such as an ultraviolet curable resin or an epoxy resin, or an inorganic material such as titanium nitride or silicon nitride, and a material with low water permeability is used.

  In addition, when the getter agent layer 21 and the sealing layer 23 are not provided continuously over the entire circumference of the sealing portion interface, but are provided discretely, preferably these getter agent layers 21 and It is assumed that the substrate 1 or the sealing cap 11 is designed to ensure a dedicated space for providing the sealing layer 23.

Next, a method for manufacturing such a display device will be described.
First, after forming an organic electroluminescent element in the display region 10 on the substrate 1, uncured sealing resin 12 is dropped over the entire periphery of the display region 10 with a spacer. Next, a sealing cap 11 is disposed so as to face the substrate 1 in a state of covering the display region 10, and the sealing surface A of the sealing cap 11 is placed on the sealing resin 12. A sealing resin 12 is filled between the periphery of the substrate 1. Thereafter, the sealing resin 12 is cured, whereby the substrate 1 and the sealing cap 11 are bonded and sealed with the sealing resin 12.

  Next, the getter agent layer 21 is formed in a state of covering the exposed portion on the outer peripheral side of the sealing portion interface between the substrate 1 and the sealing cap 11. At this time, the uncured getter agent layer 21 is applied so as to cover the outer peripheral side exposed portion of the sealing portion interface, and then the getter agent layer 21 is cured, or the outer peripheral side exposure is performed by a technique such as vacuum deposition. You may make it form the getter agent layer 21 directly so that a part may be covered.

  Thereafter, a sealing layer 23 is formed so as to further cover the getter agent layer 21. At this time, an uncured sealing material such as an ultraviolet curable resin or an epoxy resin is applied and then the sealing material is cured, or an inorganic sealing material is formed using a technique such as sputtering or CVD. Alternatively, the sealing layer 23 made of an inorganic sealing material may be formed.

  In the display device of the first embodiment thus obtained, the getter agent layer 21 is provided so as to cover the exposed portion on the outer peripheral side of the sealing portion interface between the substrate 1 and the sealing cap 11. 1 and the sealing cap 11 (including the inside of the sealing resin 12) are protected by the getter agent layer 21, and moisture and oxygen in the outside air can be prevented from reaching this sealing portion interface. For this reason, the penetration | invasion of the water | moisture content and oxygen from the sealing part interface to the hollow part a side can be prevented. In addition, since the sealing layer 23 is provided so as to cover the getter agent layer 21, supply of moisture and oxygen to the getter agent layer 21 is prevented, so that the getter agent layer 21 captures moisture and oxygen and stores water. Will never be done.

  Therefore, it is possible to prevent moisture and oxygen in the outside air from entering the hollow portion a between the substrate 1 and the sealing cap 11, and the organic electroluminescent element 2 provided in the display region 10 in the hollow portion a. Deterioration due to moisture and oxygen can be prevented. As a result, the generation of dark spots in the driving state and long-term storage state of the organic electroluminescent element 2 can be suppressed, and a display device capable of long-term storage and stable light emission for a long time can be obtained. .

  In the first embodiment described above, the case where the sealing cap 11 having a wider sealing surface by bending the peripheral edge in the outer peripheral direction has been described. However, the display device of the first embodiment is not limited to the shape and configuration of the sealing cap 11 and is cut with the peripheral portion standing substantially perpendicular to the bottom portion as shown in FIG. A sealing cap 11 ′ having the above structure may be used. Even in such a display device, in the same manner as described above, the getter is in a state of covering the outer peripheral exposed portion of the interface between the substrate 1 and the sealing resin 12 and the interface between the sealing resin 12 and the sealing cap 11 ′. The agent layer 21 is provided over the entire circumference, and the sealing layer 23 is provided so as to cover the getter agent layer 21.

  When a glass plate is used as the sealing cap 11, a glass plate (directly attached to the organic electroluminescent element 2 on the substrate 1 is formed by forming a recess in the glass plate using a method such as sandblasting or etching. It is also effective to devise so that the sealing cap and the adhesive (sealing resin) do not come into contact with each other.

Moreover, you may use the method of ensuring the space between the board | substrate 1 and a glass plate by providing the adhesive material (sealing resin 12) which mixed the filler only in the peripheral part using the flat glass plate. In such a configuration, mixing the filler into the sealing resin 12 lowers the barrier property against moisture and oxygen of the sealing resin 12. However, by covering the exposed outer peripheral surface of the sealing resin 12 with the getter agent layer 21 and the sealing layer 23, this barrier property is compensated for and the deterioration of the organic electroluminescent element housed in the hollow portion is prevented. It becomes possible.

  In the first embodiment described above, the case where the display region 10 is provided in the hollow portion a between the substrate 1 and the sealing cap 11 has been described. However, as shown in FIG. 5, the present invention can also be applied to a display device in which the display area 10 is sealed in a sealing resin 13. In this case, a sealing resin 13 is filled between the substrate 1 and the plate-shaped sealing substrate 14 so as to cover the display region 10. And the getter agent layer 21 is covered over the entire circumference in a state of covering the interface between the substrate 1 and the sealing resin 13, the interface between the sealing resin 13 and the sealing substrate 14, and the exposed outer periphery of the sealing resin 13. It shall be provided. Furthermore, the sealing layer 23 is provided so as to cover the getter agent layer 21.

  In the display device having such a configuration, the sealing resin 13 between the substrate 1 and the sealing substrate 14, or the interface between the substrate 1 and the sealing resin 13, and the interface between the sealing resin 13 and the sealing substrate 14. Therefore, it is possible to prevent moisture and oxygen in the outside air from entering the display region 10 side. Therefore, similarly to the display device described with reference to FIGS. 2 and 4, the organic electroluminescence element 2 provided in the display region 10 can be prevented from being deteriorated by moisture or oxygen, can be stored for a long period of time, and can be stable for a long time. Thus, a display device capable of emitting light can be obtained.

(Second Embodiment)
FIG. 6 is a configuration diagram of a main part of the display device according to the second embodiment. The difference between the display device shown in this figure and the display device described in the first embodiment is in the portion where the getter agent layer 21 is provided. That is, in the display device of the second embodiment, the getter agent layer 21 is filled in the recess 1 a formed in the substrate 1.

  The recess 1a is provided in the vicinity of the inner periphery of the interface of the sealing portion between the substrate 1 and the sealing cap 11, more specifically between the sealing portion interface and the display region 10 and adjacent to the sealing portion interface. Yes. The recess 1a is preferably provided continuously over the entire periphery of the display area 10.

  The getter agent layer 21 filled in the recess 1a is provided in a state of being exposed in the hollow portion a between the substrate 1 and the sealing cap 11. The configuration of the getter agent layer 21 is the same as that described in the first embodiment.

  In order to manufacture such a display device, first, the organic electroluminescent element 2 is formed in the display region 10 on the substrate 1, and the outer periphery of the display region 10 of the substrate 1 and between the substrate 1 and the sealing cap 11. The concave portion 1a is formed over the entire circumference at a position that becomes the inner circumference of the sealing portion. Here, when the substrate 1 is made of a glass substrate, the concave portion 1a is formed in the glass plate using a technique such as a sandblasting method or an etching method before or after the step of forming the organic electroluminescent element 2. Further, when the substrate 1 is made of a silicon substrate, the recess 1a is formed in the silicon substrate in the step of forming the organic electroluminescent element 2.

  Next, the uncured getter agent layer 21 is filled in the recess 1a with a dispenser, and then the getter agent layer 21 is cured.

  After the above, the uncured sealing resin 12 is dropped onto the outer peripheral position of the recess 1a (that is, the getter agent layer 21) on the substrate 1 with a dispenser. Next, a sealing cap 11 is disposed so as to face the substrate 1 in a state of covering the display region 10, and the sealing surface A of the sealing cap 11 is placed on the sealing resin 12. A sealing resin 12 is filled between the periphery of the substrate 1. Thereafter, the sealing resin 12 is cured, whereby the substrate 1 and the sealing cap 11 are bonded and sealed with the sealing resin 12.

  In the display device according to the second embodiment thus obtained, the getter agent layer 21 is filled in the recess 1a provided near the inner periphery of the sealing portion interface between the substrate 1 and the sealing cap 11. Even if outside air enters from the interface (including the inside of the sealing resin 12) between the substrate 1 and the sealing cap 11, moisture and oxygen in the outside air are immediately captured by the getter agent layer 21. For this reason, it is possible to prevent moisture and oxygen in the outside air from diffusing into the hollow portion 1 a between the substrate 1 and the sealing cap 11, and the organic electroluminescent device provided in the display region 10 in the hollow portion a 2 can prevent deterioration due to moisture and oxygen. As a result, similar to the first embodiment, the generation of dark spots in the driving state and the long-term storage state of the organic electroluminescent element 2 can be suppressed, the display can be stored for a long time and can stably emit light for a long time. It becomes possible to obtain a device.

  Note that the display device of the second embodiment is limited by the shape of the sealing cap 11 as in the first embodiment, as long as the space between the substrate 1 and the sealing cap 11 is a hollow portion a. Will never be done.

  Moreover, this 2nd Embodiment can also be applied in combination with 1st Embodiment, and when it combines, it can anticipate further improving the effect which suppresses deterioration of the organic electroluminescent element by penetration | invasion of a water | moisture content or oxygen.

(Third embodiment)
FIG. 7 is a main part configuration diagram of the display device of the third embodiment. The difference between the display device shown in this figure and the display device described in the prior art is that the substrate 1 and the sealing cap 11 are provided with recesses 1a and 11a, respectively. That is, in the display device according to the third embodiment, the concave portions 1a and 11a are provided on the opposing surface sides of the peripheral portions of the substrate 1 and the sealing cap 11, respectively, and further sealed in the concave portions 1a and 11a. Resin 12 is filled. That is, the recesses 1 a and 11 a are provided on the sealing surface of the substrate 1 and the sealing cap 11.

  These recesses 1 a and 11 a are preferably provided over the entire circumference of the substrate 1 and the sealing cap 11. The sealing resin 12 may be the same ultraviolet curable resin (UV resin) as described in the first embodiment, a two-component mixed epoxy resin, a thermosetting epoxy resin, or the like. The material and shape of the substrate 1 and the sealing cap 11 are the same as those of the substrate and the sealing cap of the first embodiment.

  In order to manufacture the display device having such a configuration, first, the organic electroluminescent element 2 is formed in the display region 10 on the substrate 1, and the substrate 1 and the sealing cap 11 are formed on the outer periphery of the display region 10 in the substrate 1. The recessed portion 1a is formed over the entire circumference at a position where the sealing portion becomes. Here, when the substrate 1 is made of a glass substrate, the concave portion 1a is formed in the glass substrate using a technique such as a sandblasting method or an etching method before or after the step of forming the organic electroluminescent element 2. Further, when the substrate 1 is made of a silicon substrate, the recess 1 a is formed in the silicon substrate in the process of forming the organic electroluminescent element 2.

  In addition, a recess 11 a is formed on the sealing surface side at the periphery of the sealing cap 11 over the entire periphery. Here, the recess 11a is formed by a method appropriately selected according to the material of the sealing cap 11 from processing methods such as a sandblasting method, an etching method, and a pressing method.

  Next, an uncured sealing resin 12 is filled in the recess 1a of the substrate 1 by an amount sufficient to sufficiently seal the substrate 1 and the sealing cap 11. It is dropped on the substrate 1 in the position 1a and the outer peripheral position of the display area 10. Further, the concave portion 11a of the sealing cap 11 is directed upward, and an uncured sealing resin 12 in an amount sufficient to fill the concave portion 11a is dropped into the concave portion 11a with a dispenser.

  Next, the sealing cap 11 is turned over, the sealing cap 11 is disposed so as to face the substrate 1 so as to cover the display area 10, and the periphery of the sealing cap 11 is placed on the sealing resin 12 of the substrate 1. The sealing resin 12 is filled between the peripheral edges of the sealing cap 11 and the substrate 1. Thereafter, the sealing resin 12 is cured, whereby the substrate 1 and the sealing cap 11 are bonded and sealed with the sealing resin 12. In the series of steps, the amount of sealing resin 12 dropped onto the substrate 1 and the sealing cap 11 and the sealing resin so that bubbles and spaces are not formed in the sealing resin 12. The viscosity of 12 is adjusted.

  In the display device according to the third embodiment thus obtained, the concave portions 1a and 11a are provided on the sealing surfaces of the substrate 1 and the sealing cap 11, and the inside thereof is filled with the sealing resin 12. Therefore, when the outside air diffuses and enters from the sealing interface (including the inside of the sealing resin 12) between the substrate 1 and the sealing cap 11, the recesses 1a and 11a are disposed on the diffusion path. Will be. For this reason, in the concave portions 1a and 11a, the diffusion direction of the outside air is dispersed, and it is difficult for the outside air to reach the hollow portion a side where the display region 10 is provided. Therefore, it is possible to prevent moisture and oxygen in the outside air from being supplied to the organic electroluminescent element 2 in the display region 10.

  As a result, as in the first embodiment, the generation of dark spots in the driving state and the long-term storage state of the organic electroluminescent element can be suppressed, the display device can be stored for a long time and can stably emit light for a long time. Can be obtained.

  Note that the display device of the third embodiment can also be applied to a display device in which a plate-shaped sealing substrate 14 is provided so as to face the substrate 1 as shown in FIG. In this case, between the substrate 1 and the sealing substrate 14, the entire surface is filled with the sealing resin 13 so as to cover the display region 10. The sealing substrate 14 is provided with a recess 14a on the outer peripheral portion of the display area 10, preferably over the entire periphery. The sealing resin 13 is filled in the recess 14a and the recess 1a of the substrate 1. It will be done.

  In the display device having such a configuration, since the concave portions 1a and 14a are provided on the sealing surfaces of the substrate 1 and the sealing substrate 14, and the inside thereof is filled with the sealing resin 13, the substrate 1 From the interface between the substrate 1 and the sealing resin 13 and the interface between the sealing resin 13 and the sealing substrate 14 to the display region 10 side. And oxygen can be prevented from entering. Therefore, similarly to the display device described with reference to FIG. 7, it is possible to obtain a display device that can prevent deterioration of the organic electroluminescent element 2 due to moisture and oxygen, can be stored for a long time, and can emit light stably for a long time. Is possible.

(Fourth embodiment)
FIG. 9 is a main part configuration diagram of the display device of the fourth embodiment. The display device shown in this figure is a modification of the display device of the third embodiment. That is, the display device according to the fourth embodiment is obtained by providing the getter agent layer 21 in the recesses 1a and 11a of the substrate 1 and the sealing cap 11 in the display device according to the third embodiment described with reference to FIG. It is.

  The structure of the getter agent layer 21 is the same as that described in the first embodiment. The getter agent layer 21 is filled in the recesses 1a and 11a as illustrated or formed on the inner walls of the recesses 1a and 11a. It may be a thing. When the getter agent layer 21 is obtained by dispersing a getter agent in an adhesive resin, the getter agent layer 21 also becomes a part of the sealing resin 12. That is, the recesses 1a and 11a are filled with a sealing resin containing a getter agent.

  In order to manufacture the display device having such a configuration, first, the organic electroluminescent element 2 is formed in the display region 10 on the substrate 1 and the display on the substrate 1 is performed as in the manufacturing procedure described in the third embodiment. A recess 1 a is formed over the entire circumference at a position that becomes the sealing portion between the substrate 1 and the sealing cap 11 on the outer periphery of the region 10. In addition, a recess 11 a is formed on the sealing surface side at the periphery of the sealing cap 11 over the entire periphery.

  Next, the uncured getter agent layer 21 is dropped with a dispenser in a state where the recess 1a of the substrate 1 and the recess 11a of the sealing cap 11 are sufficiently embedded. Then, these getter agent layers 21 are cured. Thereafter, the sealing resin 12 is dropped on the substrate 1 at the outer peripheral position of the display area 10 (on the getter agent layer 21 filled in the recess 1a of the substrate 1) with a dispenser.

  Next, the sealing cap 11 is turned over, the sealing cap 11 is disposed so as to face the substrate 1 so as to cover the display area 10, and the periphery of the sealing cap 11 is placed on the sealing resin 12 of the substrate 1. The sealing resin 12 is filled between the peripheral edges of the sealing cap 11 and the substrate 1. Thereafter, the sealing resin 12 is cured, whereby the substrate 1 and the sealing cap 11 are bonded and sealed with the sealing resin 12.

  In the display device of the fourth embodiment thus obtained, the outside air that has entered from the sealing interface (including the inside of the sealing resin 12) between the substrate 1 and the sealing cap 11 reaches the recesses 1a and 11a. In this case, moisture and oxygen in the outside air are captured by the getter agent layer 21 filled in the recesses 1a and 11a. Therefore, as compared with the third embodiment, it is possible to more reliably prevent moisture and oxygen in the outside air from being supplied to the organic electroluminescent element in the display region 10.

  Note that the display device of the fourth embodiment is not limited by the shape of the sealing cap 11 as in the third embodiment, and a display using a plate-shaped sealing substrate for the substrate 1. The present invention can be applied to an apparatus and the same effect can be obtained.

  Moreover, in 3rd Embodiment and 4th Embodiment, the case where the recessed part was provided in both the board | substrate and the sealing cap (sealing board | substrate) using FIGS. 7-9 was demonstrated. However, the recess is not necessarily provided in both the substrate and the sealing cap (sealing substrate), and may be provided only in at least one of the substrate and the sealing cap (sealing substrate). Moreover, if these recessed parts are sealed with respect to the outside and the inside side where the light emitting region 10 is formed by the sealing resins 12 and 13, the sealing resins 12 and 13 need not necessarily be filled. There is no.

  Further, the third embodiment and the fourth embodiment can be combined with at least one of the first embodiment and the second embodiment, and the combination can further enhance the effect of preventing moisture and oxygen from entering, It can be expected to enhance the effect of suppressing the deterioration of the organic electroluminescent element.

  Next, examples of the present invention will be described. Prior to description of each example, comparative examples corresponding to these examples will be described.

(Comparative example)
This comparative example corresponds to the display device having the configuration described in the prior art with reference to FIG.

  First, the organic electroluminescent element 2 was formed in the display area 10 on the substrate 1 made of a 30 mm × 30 mm glass plate. At this time, ITO (thickness: about 100 nm) was formed as a lower electrode to be an anode electrode, and a cell for an organic electroluminescence device was produced by masking an area other than a 2 mm × 2 mm light emitting region with an insulating film by SiO 2 vapor deposition.

  Next, as a hole transport layer, TPD (N, N′-diphenyl-N, N′-di (3-methylphenyl) 4,4′-diaminobiphenyl) shown in FIG. Vapor deposition (deposition rate 0.2 to 0.4 nm / sec.) Was performed. On the deposited TPD, an aluminum quinoline complex Alq3 (tris (8-quinolinol) aluminum) (see FIG. 11), which is a light emitting material having electron transport properties, is used as a light emitting layer of 50 nm (deposition rate 0.2 to 0.4). After deposition, about 0.5 nm of Li was deposited as a cathode electrode (deposition rate ~ 0.03 nm / sec.), and AlSiCu (Si 1 weight percent, Cu 0.5 weight percent) as a cathode electrode sealing layer ) Was deposited at 200 nm. Further, an AuGe electrode was deposited to a thickness of 200 nm for complete sealing to produce an organic electroluminescent device.

  When the characteristics of the organic electroluminescence device thus fabricated were measured, the maximum emission wavelength was 520 nm, and the coordinates on the CIE chromaticity coordinates were (0.32, 0.54), and good green emission was exhibited. The luminance at a current density of 100 mA / cm2 was 6400 cd / m2. It was clear from the shape of the emission spectrum that the emission was from Alq3.

  A sealing cap 11 was bonded to the substrate 1 on which the organic electroluminescent element 2 was formed by the above method. At this time, a concave shape that did not contact the cathode electrode of the element was formed on an aluminum plate having a thickness of 5 mm by cutting, and this was used as the sealing cap 11. Adhesion between the sealing cap 11 and the substrate 1 was performed using a two-component mixed epoxy resin (Narase Ciba-Gaigi Araldide) as the sealing resin 12. The bonding work was performed in an environment where the moisture and oxygen concentrations were 1 ppm or less.

  The display device thus manufactured was driven at a constant current of 5 mA / cm2 in the outside air at an ambient temperature of 20 ° C. and a relative humidity of 20% (initial luminance: 230 cd / m2). There were no dark spots that could be observed with the naked eye, and no dark spots were observed when observed through a viewfinder with a magnification of 10 times.

  Furthermore, an acceleration test was performed in which the display device was driven at a constant current of 5 mA / cm 2 in the outside air at a temperature of 50 ° C. and a relative humidity of 60%. The initial luminance was 200 cd / m 2, and a lot of dark spots were generated on the light emitting surface in 1 hour after driving, and it was difficult to count the number, and uniform light emission on the light emitting surface could not be obtained.

  As described above, it has been confirmed that the conventional display device is significantly deteriorated by long-time driving.

Example 1
Example 1 to be described below and Example 2 to Example 4 following Example 1 have a configuration in which the sealing layer 23 is not provided in the display device described with reference to FIG. 2 in the first embodiment. It corresponds to the thing. Hereinafter, Examples 1 to 4 will be described with reference to FIG.

  First, similarly to the comparative example, an organic electroluminescence device was produced, a cathode electrode sealing layer was formed, and a sealing cap 11 was adhered.

  Then, the adhesion layer (namely, getter agent layer 21) containing the getter agent in the present invention was applied to the interface of the sealing portion between the substrate 1 and the sealing cap 11. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of CaCl 2 in an ultraviolet curable resin (Three Bond 3027C). Using a dispenser, the adhesive layer material was uniformly applied so as to cover the interface between the sealing cap 11 and the substrate 1, and cured with an ultraviolet lamp. A series of operations were performed in an environment with a moisture and oxygen concentration of 1 ppm or less.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 30 on average.

(Example 2)
A cell for organic electroluminescence was produced in the same manner as in the comparative example, and then m-MTDATA (4,4 ′, 4 ″ -tris (3-methylphenylphenylamino) triphenylamine) (deposition rate: 0.2) shown in FIG. .About.0.4 nm / sec.) Under vacuum by a vacuum deposition method, 30 nm under vacuum, and α-NPD (α-naphtyl phenil diamine) shown in FIG. ~ 0.4nm / sec.), 50nm of Alq3 (8-hydroxy quinorine alminum) was deposited as an electron transporting light emitting layer, and about 0.5nm of Li was deposited as a cathode electrode (deposition rate ~ 0.3nm / sec.). As a cathode electrode sealing layer, AlCu (Cu 1 weight percent) was deposited by 200 nm. Further, an AuGe electrode was deposited to a thickness of 200 nm for complete sealing to produce an organic electroluminescent device.

  When the characteristics of the organic electroluminescence device thus fabricated were measured, the maximum emission wavelength was 520 nm, and the coordinates on the CIE chromaticity coordinates were (0.32, 0.55), and good green emission was exhibited. The luminance at a current density of 400 mA / cm2 was 26000 cd / m2. It was clear from the shape of the emission spectrum that the emission was from Alq3.

  A sealing cap 11 was adhered to the substrate 1 on which the organic electroluminescent element 2 was formed by the above method, in the same manner as in the comparative example.

  In such a state, when the organic electroluminescence device was driven at a constant current of 5 mA / cm2 in the outside air at an ambient temperature of 20 ° C. and a relative humidity of 20% (initial luminance: 230 cd / m2), 1 hour after the drive, There were no dark spots that could be observed with the naked eye, and no dark spots were observed when observed through a viewfinder with a magnification of 10 times.

  Next, an adhesive layer containing the getter agent in the present invention (that is, the getter agent layer 21) was applied to the sealing portion interface between the substrate 1 and the sealing cap 11. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of CaO in an ultraviolet curable resin (Three Bond 3027C). Using a dispenser, the adhesive layer material was uniformly applied so as to cover the interface between the sealing cap 11 and the substrate 1, and cured with an ultraviolet lamp. A series of operations were performed in an environment with a moisture and oxygen concentration of 1 ppm or less.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 30 on average.

(Example 3)
A display device was produced in the same procedure as in Example 2 except that an ultraviolet curable resin (30Y-296G manufactured by Three Bond) was used as the sealing resin 12 used for bonding the substrate 1 and the sealing cap 11. .

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 30 on average.

Example 4
Except that the getter agent layer 21 provided in a state of covering the sealing portion interface between the substrate 1 and the sealing cap 11 is a composition in which 30% by weight of BaO is mixed in an ultraviolet curable resin (Three Bond 3027C). A display device was manufactured in the same procedure as in Example 3.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 30 on average.

  As described above, from the results of the acceleration test in Examples 1 to 4 and the results of the acceleration test in the comparative example, an organic electric field obtained by providing the getter agent layer 21 at the sealing portion interface between the substrate 1 and the sealing cap 11. The effect of preventing deterioration of the light emitting element was confirmed.

(Example 5)
Example 5 and Example 6 and Example 7 following Example 5 correspond to the display device described with reference to FIG. 2 in the first embodiment. Hereinafter, Example 5 to Example 7 will be described with reference to FIG.

  In the same manner as in Example 3, production of an organic electroluminescent element, formation of a cathode electrode sealing layer, adhesion of the sealing cap 11, and formation of a getter agent layer 21 were performed.

  Next, the sealing layer 23 was formed so as to cover the entire getter agent layer 21. At this time, an ultraviolet curable resin (Three Bond 3027C) not containing a getter agent is applied to the getter agent layer 21, cured with an ultraviolet lamp, and the sealing layer 23 is sandwiched between the getter agent layers 21. Formed. A series of operations were performed in an environment with a moisture and oxygen concentration of 1 ppm or less.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 20 on average.

(Example 6)
In the same manner as in Example 4, preparation of an organic electroluminescent element, formation of a cathode electrode sealing layer, adhesion of the sealing cap 11, and formation of a getter agent layer 21 were performed.

  Next, in the same manner as in Example 5, a sealing layer 23 was formed so as to cover the entire getter agent layer 21.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 20 on average.

(Example 7)
Here, the sealing cap 11 was the same as that of Example 6 except that a sealing cap 11 having a concave shape so as not to contact the cathode electrode of the element by a sandblasting device was used on a glass plate having a thickness of 5 mm. A display device was produced according to the procedure.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 20 on average.

  As described above, in Example 5 to Example 7, the generation of dark spots in the acceleration test is suppressed to 2/3 of Example 1 to Example 4, and the sealing layer 23 covering the getter agent layer 21 is provided. As a result, it was confirmed that the effect of preventing the deterioration of the organic electroluminescent element was further increased.

(Example 8)
The following Example 8 corresponds to the display device described with reference to FIG. 5 in the first embodiment, in which the sealing layer 23 is not provided. Hereinafter, Example 8 will be described with reference to FIG.

  In the same manner as in Example 2, the production of the organic electroluminescent element and the formation of the cathode electrode sealing layer were performed.

  A plate-shaped sealing substrate 14 was bonded to the substrate 1 on which the organic electroluminescent element was formed by the above method. At this time, an ultraviolet curable resin (Three Bond 3027C) is applied as a whole to a glass plate (sealing substrate 14) having a thickness of 1.1 mm as the sealing resin 13 and adhered thereto. The electroluminescent element 20 was sealed. The bonding work was performed in an environment where the moisture and oxygen concentrations were 1 ppm or less.

  In such a state, when the organic electroluminescence device was driven at a constant current of 5 mA / cm2 in the outside air at an ambient temperature of 20 ° C. and a relative humidity of 20% (initial luminance: 230 cd / m2), 1 hour after the drive, There were no dark spots that could be observed with the naked eye, and no dark spots were observed when observed through a viewfinder with a magnification of 10 times.

  Next, an adhesive layer containing the getter agent in the present invention (that is, the getter agent layer 21) was formed at the interface of the sealing portion between the substrate 1 and the sealing substrate 14. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of CaO in an ultraviolet curable resin (Three Bond 3027C). Using a dispenser, the adhesive layer material was uniformly applied so as to cover the sealing portion interface between the sealing substrate 14 and the substrate 1, and cured with an ultraviolet lamp. A series of operations were performed in an environment with a moisture and oxygen concentration of 1 ppm or less.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 30 on average.

  From the results of Example 8, it was possible to confirm the effect of preventing the deterioration of the organic electroluminescent element by providing the getter agent layer 21 at the sealing portion interface between the substrate 1 and the sealing substrate 14.

Example 9
The following Example 9 and Example 10 following this correspond to the display device described with reference to FIG. 5 in the first embodiment. Hereinafter, Example 9 will be described first with reference to FIG.

  In the same manner as in Example 8, production of an organic electroluminescent element, formation of a sword electrode sealing layer, and adhesion of the sealing substrate 14 were performed.

  Next, an adhesive layer containing the getter agent in the present invention (that is, the getter agent layer 21) was formed at the interface of the sealing portion between the substrate 1 and the sealing substrate 14. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of BaO in an ultraviolet curable resin (Three Bond 3027C). Using a dispenser, the adhesive layer material was uniformly applied so as to cover the interface between the sealing substrate 14 and the substrate 1, and cured with an ultraviolet lamp. A series of operations were performed in an environment with a moisture and oxygen concentration of 1 ppm or less.

  Thereafter, the sealing layer 23 was formed so as to cover the entire getter agent layer 21. At this time, an ultraviolet curable resin (Three Bond 3027C) not containing a getter agent is applied to the getter agent layer 21, cured with an ultraviolet lamp, and the sealing layer 23 is sandwiched between the getter agent layers 21. Formed. A series of operations were performed in an environment with a moisture and oxygen concentration of 1 ppm or less.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 20 on average.

(Example 10)
In the same manner as in Example 8, after manufacturing the organic electroluminescence device, AlCu (Cu 1 weight percent) was deposited as a cathode electrode sealing layer by 200 nm. Furthermore, in order to complete the sealing, 3 μm of SiN was formed by a plasma CVD method to produce an organic electroluminescent device.

  When the characteristics of the organic electroluminescence device thus fabricated were measured, the maximum emission wavelength was 520 nm, and the coordinates on the CIE chromaticity coordinates were (0.32, 0.55), and good green emission was exhibited. The luminance at a current density of 400 mA / cm2 was 26000 cd / m2. It was clear from the shape of the emission spectrum that the emission was from Alq3.

  Next, as in Example 8, the sealing substrate 14 was bonded.

  Then, the adhesion layer (namely, getter agent layer 21) containing the getter agent in this invention was formed in the sealing part interface of the board | substrate 1 and the sealing substrate 14. FIG. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of BaO in a two-component mixed epoxy resin (Araldide manufactured by Nagase Ciba-Gaigi). Using a dispenser, the adhesive layer material was applied quickly and uniformly so as to cover the interface between the sealing substrate 14 and the substrate 1, and cured in an environment having a moisture and oxygen concentration of 1 ppm or less.

  Thereafter, as in Example 9, a sealing layer 23 was formed so as to cover the entire getter agent layer 21.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 20 on average.

  As described above, in Example 9 and Example 10, the generation of dark spots in the acceleration test is suppressed to 2/3 of Example 8, and even when the plate-shaped sealing substrate 14 is used, It was confirmed that providing the sealing layer 23 covering the getter agent layer 21 further increases the effect of preventing the deterioration of the organic electroluminescent element.

(Example 11)
Example 11 to be described next and Example 12 following this correspond to the display device described with reference to FIG. 7 in the third embodiment in which the recess 11a is provided only on the sealing cap 11 side. is doing. Hereinafter, Example 11 will be described first with reference to FIG.

  First, in the same manner as in Comparative Example 1, an organic electroluminescent element was manufactured.

  Thereafter, a sealing cap 11 was bonded to the substrate 1 on which the organic electroluminescent element was formed. The sealing cap 11 has a concave portion 11a unique to the present invention, and is formed by press molding Kovar. At this time, the bonding width of the sealing surface at the peripheral portion of the sealing cap 11 was set to 4 mm, and a concave portion 11 a having a width of 1 mm was formed over the entire circumference of the sealing cap 11. Then, an ultraviolet curable resin (Three Bond 30Y-296G) was used as the sealing resin 12, and this sealing resin 12 was uniformly applied to the peripheral portion of the sealing cap 11 using a dispenser. At this time, the sealing resin 12 was filled in the recess 11 a of the sealing cap 11. Thereafter, the substrate 1 and the sealing cap 11 were bonded together, and the sealing resin 12 was cured with an ultraviolet lamp. A series of operations were performed in an environment with a moisture and oxygen concentration of 1 ppm or less.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 25.

Example 12
First, the production of the organic electroluminescent element was carried out in the same manner as in Example 2.

  Thereafter, a sealing substrate not shown in FIG. 7 was bonded to the substrate 1 on which the organic electroluminescent element was formed in a state where the organic electroluminescent element was sandwiched. At this time, the entire organic electroluminescent element was covered with a sealing resin, and the organic electroluminescent element covered with the sealing resin was sandwiched between the sealing substrate and the substrate 1.

  Thereafter, the sealing cap 11 was adhered. The sealing cap 11 has a concave portion 11a unique to the present invention, and was formed by cutting an aluminum plate having a thickness of 5 mm. The design dimensions of the recess 11a are the same as those in the eleventh embodiment. Thereafter, the sealing cap 11 and the substrate 1 were bonded. At this time, the same procedure as in Example 11 was performed except that an ultraviolet curable resin (Three Bond 3027C) was used as the sealing fat 12.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was limited to about 20 on average.

  As described above, from the results of the acceleration test in Example 11 and Example 12 and the result of the acceleration test in the comparative example, the effect of preventing the deterioration of the organic electroluminescent element by providing the recess 11a at the sealing part interface of the sealing cap 11 I was able to confirm. In Example 12, the occurrence of dark spots in the acceleration test is suppressed to be lower than that in Example 11, and further organic is obtained by performing double sealing using a sealing substrate and a sealing cap. It was confirmed that the effect of preventing the deterioration of the electroluminescent element is increased.

(Example 13)
In the following Example 13, and subsequent Examples 14 and 15, the display device described with reference to FIG. 9 in the fourth embodiment is provided with the recess 11a only on the sealing cap 11 side. It corresponds to. Hereinafter, Example 13 will be described first with reference to FIG.

  First, in the same manner as in Example 12, an organic electroluminescent element and a sealing cap 11 were manufactured.

  Next, an adhesive layer containing a getter agent was applied in the recess 11a of the produced sealing cap 11. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of CaO in an ultraviolet curable resin (Three Bond 3027C). And the adhesive layer material was apply | coated in the state filled with the recessed part 11a of the sealing cap 11 using dispenser. Thereafter, the adhesive layer material was cured with an ultraviolet lamp, and thereby the getter agent layer 21 was filled in the recess 11a.

  Then, the sealing cap 11 and the board | substrate 1 were adhere | attached using the ultraviolet curable resin (Threebond 30Y-296G) as the sealing resin 12. FIG. The adhesion procedure was the same as in Example 11 and Example 12.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 15.

(Example 14)
The same procedure as in Example 13 except that the getter agent layer 21 to be filled in the recess 11a of the sealing cap 11 has a structure in which 30% by weight of CaCl 2 is mixed in an ultraviolet curable resin (Three Bond 3027C). A display device was manufactured.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 15.

(Example 15)
The same procedure as in Example 13 except that the getter agent layer 21 to be filled in the recess 11a of the sealing cap 11 has a structure in which 30% by weight of BaO is mixed in an ultraviolet curable resin (Three Bond 3027C). A display device was manufactured.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 15.

  As described above, in Examples 13 to 15, the occurrence of dark spots in the acceleration test is further suppressed to be lower than in Examples 11 and 12, and by providing the getter agent layer 21 in the recess 11a, It was confirmed that the effect of preventing the deterioration of the organic electroluminescent element was increased.

(Example 16)
The following Example 16 and subsequent Examples 17 and 18 correspond to the display device described with reference to FIG. 9 in the fourth embodiment, in which the concave portion 1a is provided only on the substrate 1 side. is doing. Hereinafter, Example 16 will be described first with reference to FIG.

  First, similarly to the above-described comparative example, after a cell for an organic electroluminescent element was produced, a recess 1a over the entire circumference of the substrate 1 was formed in a portion to be a sealing surface at the periphery of the substrate 1. The recess 1a was formed by a sand blast method.

  Next, an organic electroluminescent element was produced in the same manner as in Example 2.

  Thereafter, an adhesive layer containing a getter agent was applied in the recess 1 a of the substrate 1. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of CaO in an ultraviolet curable resin (Three Bond 3027C). And the adhesive layer material was apply | coated in the state filled with the recessed part 1a of the board | substrate 1 using the dispenser. Thereafter, the adhesive layer material was cured with an ultraviolet lamp, and thereby the getter agent layer 21 was filled in the recess 1a.

  Then, the sealing cap 11 and the board | substrate 1 were adhere | attached using the ultraviolet curable resin (Threebond 30Y-296G) as the sealing resin 12. FIG. The adhesion procedure was the same as in Example 11 and Example 12.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 15.

(Example 17)
Display is performed in the same procedure as in Example 16 except that the getter agent layer 21 filled in the recess 1a of the substrate 1 is configured by mixing 30% by weight of CaCl2 in an ultraviolet curable resin (3027C manufactured by Three Bond). A device was made.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 15.

(Example 18)
The getter agent layer 21 to be filled in the recess 1a of the substrate 1 is displayed in the same procedure as in Example 16 except that 30 wt% of BaO is mixed in an ultraviolet curable resin (Three Bond 3027C). A device was made.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 15.

  As described above, in Examples 16 to 18, the generation of dark spots in the acceleration test is suppressed to the same extent as in Examples 13 to 15, and the getter agent layer 21 is provided in the recess 1a on the substrate 1 side. Even in this case, it was confirmed that the effect of preventing the deterioration of the organic electroluminescent element was obtained to the same extent as when the getter agent layer 21 was provided in the recess 11a on the sealing cap 11 side.

(Example 19)
The following Example 19 and Example 20 following this correspond to the display device described with reference to FIG. 9 in the fourth embodiment. Hereinafter, Example 19 will be described first with reference to FIG.

  First, in the same manner as in Examples 16 to 18, the formation of the organic electroluminescent element, the formation of the recess 1a in the peripheral edge of the substrate 1, and the filling of the getter agent layer 21 in the recess 1a were performed. However, as the getter agent layer 21, a mixture of 30% by weight of CaCl2 in an ultraviolet curable resin (Three Bond 3027C) was used.

  Then, the sealing cap 11 which has the recessed part 11a was produced like Example 11-Example 15. Next, the getter agent layer 21 was filled into the recess 11 a of the sealing cap 11 in the same manner as in Examples 13 to 15. However, as the getter agent layer 21, a mixture of 30% by weight of CaCl2 in an ultraviolet curable resin (Three Bond 3027C) was used.

  After the above, an ultraviolet curable resin (Three Bond 30Y-296G) was used as the sealing resin 12 to bond the sealing cap 11 and the substrate 1 together. The adhesion procedure was the same as in Example 11 and Example 12.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 10.

(Example 20)
The getter agent layer 21 filled in the concave portion 1a of the substrate 1 and the getter agent layer 21 filled in the concave portion 11a of the sealing cap 11 were mixed with 30% by weight of BaO in an ultraviolet curable resin (3027C manufactured by Three Bond). A display device was manufactured in the same procedure as in Example 19 except that the configuration was adopted.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was suppressed to about 10 on average.

  As described above, in Examples 19 to 20, the generation of dark spots in the acceleration test is suppressed to 2/3 of Examples 13 to 18, and both the sealing cap 11 and the substrate 1 are provided with recesses. It was confirmed that filling the getter agent layer 21 further increases the effect of preventing the deterioration of the organic electroluminescent element.

(Example 21)
Example 21 to be described next corresponds to the display device described with reference to FIG. 8 in the third embodiment having a configuration in which the concave portion 14a is provided only on the sealing substrate 14 side. Hereinafter, Example 21 will be described with reference to FIG.

  First, in the same manner as in Comparative Example 1, an organic electroluminescent element was manufactured.

  Thereafter, a plate-shaped sealing substrate 14 was bonded to the substrate 1 on which the organic electroluminescent element was formed. The sealing substrate 14 has a concave portion 14a unique to the present invention, and the concave portion 14a is formed by a sandblasting method on the peripheral portion of a glass substrate having a plate thickness of 1.1 mm (that is, the sealing substrate 14). At this time, a concave portion 14 a having a width of 1 mm was formed in a portion serving as a sealing surface at the peripheral portion of the sealing substrate 14 over the front periphery of the sealing substrate 14.

  Then, an ultraviolet curable resin (Three Bond 30Y-296G) was used as the sealing resin 12, and this sealing resin 12 was applied so as to fill the recess 14 a of the sealing substrate 14. Moreover, the sealing resin 12 was apply | coated to the whole surface on the board | substrate 1 in the state which covers an organic electroluminescent element. Thereafter, the substrate 1 and the sealing substrate 14 were bonded together, and the organic electroluminescent element was sealed in the sealing resin 12 between the substrate 1 and the sealing substrate 14. Next, the sealing resin 12 was cured with an ultraviolet lamp. A series of operations were performed in an environment with a moisture and oxygen concentration of 1 ppm or less.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 25.

  From the results of Example 21, it was possible to confirm the effect of preventing the deterioration of the organic electroluminescent element due to the provision of the concave portion at the sealing portion interface between the substrate 1 and the sealing substrate 14.

(Example 22)
Example 22 corresponds to the display device described with reference to FIG. 8 in the third embodiment in which the recess 14a is provided only in the sealing substrate 14 and the getter agent layer is filled. Hereinafter, Example 22 will be described with reference to FIG.

  First, in the same manner as in Example 21, an organic electroluminescent element and a sealing substrate 14 were manufactured.

  Next, an adhesive layer containing a getter agent was applied in the recess 14 a of the sealing substrate 14. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of CaO in an ultraviolet curable resin (Three Bond 3027C). And the adhesive layer material was apply | coated in the state filled with the recessed part 14a of the sealing substrate 14 using dispenser. Thereafter, the adhesive layer material was cured with an ultraviolet lamp, thereby filling the recess 14a with the getter agent layer (21).

  Thereafter, the sealing substrate 14 and the substrate 1 were bonded using an ultraviolet curable resin (Three Bond 30Y-296G) as the sealing resin 12. The adhesion procedure was the same as in Example 21.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 15.

  As described above, in Example 22, the generation of dark spots in the acceleration test is suppressed to be lower than that in Example 21, and even when the plate-shaped sealing substrate 14 is used, the recess 14a of the sealing portion is used. It was confirmed that the effect of preventing the deterioration of the organic electroluminescent element was further increased by providing the getter agent layer 21 therein.

(Example 23)
Example 23 corresponds to the display device described with reference to FIG. 8 in the third embodiment in which the recess 1a is provided only on the substrate 1 and the getter agent layer is filled. Hereinafter, Example 23 will be described with reference to FIG.

  First, similarly to the above-described comparative example, after a cell for an organic electroluminescent element was produced, a recess 1a over the entire circumference of the substrate 1 was formed in a portion to be a sealing surface at the periphery of the substrate 1. The recess 1a was formed by a sand blast method.

  Thereafter, an organic electroluminescent element was produced in the same manner as in Example 2.

  Next, an adhesive layer containing a getter agent was applied in the recess 1 a of the substrate 1. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of CaO in an ultraviolet curable resin (Three Bond 3027C). And the adhesive layer material was apply | coated in the state filled with the recessed part 1a of the board | substrate 1 using the dispenser. Thereafter, the adhesive layer material was cured with an ultraviolet lamp, and thereby the getter agent layer 21 was filled in the recess 1a.

  Next, the sealing substrate 14 and the substrate 1 were bonded using an ultraviolet curable resin (30Y-296G manufactured by Three Bond) as the sealing resin 12. The adhesion procedure was the same as in Example 21 and Example 22.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 15.

  As described above, in Example 23, the occurrence of dark spots in the acceleration test is suppressed to the same extent as in Example 22, and even when the recess 1a is provided only in the substrate 1 and the getter agent layer is filled, the plate It has been confirmed that the effect of preventing the deterioration of the organic electroluminescent element can be obtained to the same extent as when the getter agent layer 21 is provided in the concave portion 14a on the side of the sealing substrate 14 in the shape.

(Example 24)
Example 24 corresponds to the display device described with reference to FIG. 8 in the third embodiment, in which the recess 1a of the substrate 1 and the recess 14a of the sealing substrate 14 are filled with a getter agent layer. Yes. Hereinafter, Example 24 will be described with reference to FIG.

  First, in the same manner as in Example 23, the formation of the organic electroluminescent element, the formation of the recess 1a in the peripheral portion of the substrate 1, and the filling of the getter agent layer 21 in the recess 1a were performed.

  Thereafter, in the same manner as in Example 22, a sealing substrate 14 having a recess 14a was produced. Next, in the same manner as in Example 22, the getter agent layer 21 was filled into the recess 14 a of the sealing substrate 14.

  After the above, the sealing substrate 14 and the substrate 1 were adhered using an ultraviolet curable resin (Three Bond 30Y-296G) as the sealing resin 12. The adhesion procedure was the same as in Example 21 and Example 22.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The average number of spots was limited to about 10.

  As described above, in Example 24, the generation of dark spots in the acceleration test is suppressed to 2/3 of Example 22 and Example 23, and the recesses 1a and 14a are provided in both the sealing substrate 14 and the substrate 1. It was confirmed that filling the getter agent layer 21 further increases the effect of preventing the deterioration of the organic electroluminescent element.

(Example 25)
Example 25 corresponds to the display device according to the second embodiment described with reference to FIG. Hereinafter, Example 25 will be described with reference to FIG.

  First, similarly to the comparative example described above, after a cell for an organic electroluminescent element was produced, a recess 1a was formed over the entire periphery of the substrate 1 at the periphery of the substrate 1 and the inner periphery of the sealing surface. . The recess 1a was formed by a sand blast method.

  Thereafter, an organic electroluminescent element was produced in the same manner as in Example 2.

  Next, an adhesive layer containing a getter agent was applied in the recess 1 a of the substrate 1. At this time, an adhesive layer material containing a getter agent was prepared by mixing 30% by weight of CaO in an ultraviolet curable resin (Three Bond 3027C). And the adhesive layer material was apply | coated in the state filled with the recessed part 1a of the board | substrate 1 using the dispenser. Thereafter, the adhesive layer material was cured with an ultraviolet lamp, and thereby the getter agent layer 21 was filled in the recess 1a.

  Subsequently, the sealing cap 11 and the board | substrate 1 were adhere | attached using the ultraviolet curable resin (Threebond 30Y-296G) as the sealing resin 12. FIG. At this time, the sealing resin 12 was uniformly applied to the periphery of the recess 1a and the getter agent layer 21 filled therein using a dispenser. Thereafter, the substrate 1 and the sealing cap 11 were bonded together, and the sealing resin 12 was cured with an ultraviolet lamp. A series of operations were performed in an environment with a moisture and oxygen concentration of 1 ppm or less.

  The display device thus manufactured was subjected to an acceleration test similar to that of the comparative example. As a result, the initial luminance was 200 cd / m2, and after 1 hour of driving, the light emitting surface was darkened by observation through a finder with a magnification of 10 times. The number of spots was suppressed to about five on average.

  From the results of the acceleration test in Example 25 and the results of the acceleration test in the comparative example, an organic electric field is obtained by providing the getter agent layer 21 in the vicinity of the inner periphery of the sealing portion interface between the substrate 1 and the sealing cap 11. The effect of preventing deterioration of the light emitting element was confirmed.

  DESCRIPTION OF SYMBOLS 1 ... Board | substrate, 1a, 11a, 14a ... Recessed part, 2 ... Organic electroluminescent element (light emitting element), 11, 11 '... Sealing cap, 12, 13 ... Sealing resin, 14 ... Sealing substrate, 21 ... Getter agent Layer, 23 ... sealing layer

Claims (6)

A substrate, a light emitting element formed on the substrate, and a sealing member disposed to face the substrate with the light emitting element sandwiched therebetween, and the light emitting element between the substrate and the sealing member In a display device formed by sealing
In a state of covering the outer peripheral side exposed portion of the sealing portion interface between the substrate and the sealing member, a getter agent layer that captures at least one of moisture and oxygen is provided,
The sealing member is a plate-shaped sealing substrate, and a sealing resin is provided between the substrate and the sealing substrate so as to cover the light emitting element provided in the display region on the substrate. A display device in which the light emitting element is sealed by being filled. The getter agent layer is provided over the entire circumference in a state of covering the interface between the substrate and the sealing resin, the interface between the sealing resin and the sealing substrate, and the exposed outer periphery of the sealing resin. The display device according to claim 1. The display device according to claim 2, wherein a sealing layer is provided so as to cover the getter agent layer. The display device according to claim 3, wherein the light emitting element is an organic electroluminescent element. After a light emitting element is formed on a substrate, a sealing member is provided so as to face the substrate with the light emitting element being sandwiched, and the display device is sealed between the substrate and the sealing member In the method
After the light emitting element is sealed between the substrate and the sealing member, at least one of moisture and oxygen is captured while covering an exposed portion on the outer peripheral side of the sealing portion interface between the substrate and the sealing member. Performing a step of providing a getter agent layer,
A plate-shaped sealing substrate is used as the sealing member, and the entire surface is filled with sealing resin between the substrate and the sealing substrate so as to cover the light emitting element provided in the display region on the substrate. The manufacturing method of the display apparatus which seals the said light emitting element by doing. The method for manufacturing a display device according to claim 5, wherein a step of covering the getter agent layer with a sealing layer is performed.

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