JPH01213988A - Electroluminescence element - Google Patents
Electroluminescence elementInfo
- Publication number
- JPH01213988A JPH01213988A JP63038067A JP3806788A JPH01213988A JP H01213988 A JPH01213988 A JP H01213988A JP 63038067 A JP63038067 A JP 63038067A JP 3806788 A JP3806788 A JP 3806788A JP H01213988 A JPH01213988 A JP H01213988A
- Authority
- JP
- Japan
- Prior art keywords
- moisture
- proof
- buffer layer
- display
- side substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005401 electroluminescence Methods 0.000 title 1
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 20
- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 238000003860 storage Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 229920006332 epoxy adhesive Polymers 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000003475 lamination Methods 0.000 abstract 2
- 239000001993 wax Substances 0.000 description 20
- 239000010408 film Substances 0.000 description 18
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- 239000011521 glass Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- -1 polytetrafluoroethylene Polymers 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 229920002367 Polyisobutene Polymers 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000012188 paraffin wax Substances 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000007650 screen-printing Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000005083 Zinc sulfide Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical group [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920000120 polyethyl acrylate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は各種表示装置に使用されるエレクトロルミネ
ッセンス(以下、ELという)素子に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to electroluminescent (hereinafter referred to as EL) elements used in various display devices.
従来のEL素子、たとえば分散型のEL素子は、第3図
(D)で示すように、ガラス板などの透光性の表示側基
板1の片面に形成されたインジウム−スズ複合酸化物か
らなる透明性導電膜(以下、ITO膜という)にて構成
されかつパターン化された透明電極2上に、発光体粉末
を含む発光層3、反射層4、Al膜などよりなる背面電
極5が順次積層形成され、この積層部が吸湿による性能
低下を防止する目的で防湿ワックスなどからなる防湿緩
衝層6およびその外側のポリテトラフルオロエチレン製
の所定寸法の防湿フィルム7にて被覆され、さらに該フ
ィルム7上に配置したガラス板などの背面板8と表示側
基板lとの間の周辺部がエポキシ系接着剤9などで接着
封止された構造を有している。A conventional EL element, for example a dispersion type EL element, is made of an indium-tin composite oxide formed on one side of a transparent display substrate 1 such as a glass plate, as shown in FIG. 3(D). A light-emitting layer 3 containing luminescent powder, a reflective layer 4, and a back electrode 5 made of an Al film are sequentially laminated on a patterned transparent electrode 2 made of a transparent conductive film (hereinafter referred to as an ITO film). This laminated portion is covered with a moisture-proof buffer layer 6 made of moisture-proof wax or the like and a moisture-proof film 7 of a predetermined size made of polytetrafluoroethylene on the outside, in order to prevent performance deterioration due to moisture absorption. It has a structure in which the peripheral portion between the back plate 8 such as a glass plate disposed above and the display side substrate l is adhesively sealed with an epoxy adhesive 9 or the like.
しかしながら、上記従来のEL素子を組立製作する場合
、一般的に、第3図(A)に示すような基板1上に形成
された画電極2,5および層3゜4の積層部に、第3図
(B)の如く粘稠液状の防湿緩衝層6を刷毛塗りなどで
塗布したのち、この塗布面上に防湿フィルム7を載置し
、ついでこの防湿フィルム7の周辺部を第3図<C>の
如く防湿緩衝層6の粘接着性を利用して基板1に熱圧着
するが、この熱圧着時に防湿緩衝層6の周辺部の厚みが
ほとんどなくなるとともに、防湿フィルム7の外側へ防
湿緩衝層成分のはみ出し6aを生じる。However, when assembling and manufacturing the above conventional EL element, generally, a layer is added to the laminated portion of the picture electrodes 2 and 5 and layers 3 and 4 formed on the substrate 1 as shown in FIG. 3(A). After applying the moisture-proof buffer layer 6 in the form of a viscous liquid by brushing or the like as shown in FIG. C>, the adhesive property of the moisture-proof buffer layer 6 is used to bond it to the substrate 1 by thermocompression. During this thermocompression bonding, the thickness of the peripheral part of the moisture-proof buffer layer 6 is almost reduced, and the moisture-proof film 7 is bonded to the outside of the moisture-proof film 7. This causes the buffer layer components to protrude 6a.
そこで、従来では、このはみ出し6aをエタノールなど
の有機溶剤にて拭き取っているが、拭き取り操作に非常
に手間がかかる上に完全には拭き取れず、残留付着物に
よって第3図(D)に示す後工程での接着剤9の接着信
頼性が低下するという難点があった。また、上述のよう
に熱圧着によって防湿緩衝層6の周辺部の厚みが非常に
小さくなるため、この厚みに基づく粘接着力が不充分と
なり、EL素子の貯蔵中や使用中に生じるストレスによ
って防湿フィルム7が基板1から容易に剥離し、防湿性
が損なわれるという問題点もあった。Therefore, conventionally, this protrusion 6a is wiped off with an organic solvent such as ethanol, but the wiping operation is very time-consuming and cannot be wiped off completely. There was a problem in that the adhesion reliability of the adhesive 9 during the process was reduced. In addition, as mentioned above, the thickness of the peripheral part of the moisture-proof buffer layer 6 becomes extremely small due to thermocompression bonding, so the adhesive force based on this thickness becomes insufficient, and the stress generated during storage or use of the EL element causes moisture-proof protection. There was also the problem that the film 7 was easily peeled off from the substrate 1, resulting in loss of moisture resistance.
この発明は、上記従来の問題点を解決すべくなされたも
ので、防湿封止の信頼性が高く、もって貯蔵安定性およ
び耐久性にすぐれ、しかも組立製作が容易な高性能のE
L素子を提供することを目的としている。This invention was made to solve the above-mentioned conventional problems, and is a high-performance electronic device that has high reliability in moisture-proof sealing, excellent storage stability and durability, and is easy to assemble and manufacture.
The purpose is to provide an L element.
この発明者らは、上記の目的を達成するために鋭意検討
を重ねた結果、防湿緩衝層を特定材料にて構成した場合
に、従来のような熱圧着時のはみ出しを生じず、これを
除去する手間が不要になるとともに、防湿フィルムを省
略しても高い防湿封止の信頼性が得られ、もってすぐれ
た貯蔵安定性および耐久性を有する高性能のEL素子が
得られることを見い出し、この発明をなすに至った。As a result of extensive studies to achieve the above object, the inventors found that when the moisture-proof buffer layer is made of a specific material, it does not protrude during thermocompression bonding as in conventional methods and can be removed. We have discovered that not only does this eliminate the need for moisture-proof sealing, but also that high reliability of moisture-proof sealing can be obtained even if the moisture-proof film is omitted, and a high-performance EL element with excellent storage stability and durability can be obtained. He came up with an invention.
すなわち、この発明は、透光性の表示側基板上に表示側
の透明電極と背面電極とさらにこれら両電極間に介在す
る発光層とを含む素子要素が積層形成され、この積層部
が防湿ワックスを保持する不織布からなる防湿緩衝層に
て被覆されるとともに、この防湿緩衝層上に配置した背
面板と上記表示側基板とが周辺部で接着材にて封止され
てなるEL素子に係るものである。That is, in the present invention, an element element including a display-side transparent electrode, a back electrode, and a light-emitting layer interposed between these electrodes is laminated on a light-transmitting display-side substrate, and this laminated portion is coated with moisture-proof wax. This relates to an EL element that is covered with a moisture-proof buffer layer made of a non-woven fabric that holds the moisture-proof buffer layer, and in which the back plate disposed on the moisture-proof buffer layer and the display side substrate are sealed with an adhesive at the periphery. It is.
(発明の構成・作用〕
以下に、この発明のEL素子を図面を参考にして説明す
る。(Structure and operation of the invention) The EL device of the invention will be described below with reference to the drawings.
第1図はこの発明を適用した分散型EL素子の断面図を
示す。図中の1はガラス板などからなる透光性の表示側
基板であり、その片面に各種真空中薄膜形成法により形
成されたITO膜などからなる厚さ200〜s、ooo
人程度のパターン化された透明電極2上に順次、発光層
3、反射層4、背面電極5が積層形成され、この積層部
の上面および周側面の全体が防湿緩衝層lOにて被覆さ
れており、さらに防湿緩衝層10上に配置したガラス板
などからなる背面板8と表示側基板1との間が周辺部に
おいてエポキシ系などの接着剤9にて封止されている。FIG. 1 shows a sectional view of a distributed EL element to which the present invention is applied. 1 in the figure is a light-transmitting display-side substrate made of a glass plate, etc., and one side thereof is made of an ITO film or the like formed by various vacuum thin film forming methods, and has a thickness of 200 to 200 seconds, ooo
A light-emitting layer 3, a reflective layer 4, and a back electrode 5 are sequentially laminated on a transparent electrode 2 patterned to the size of a human being, and the entire upper surface and peripheral side of this laminated portion is covered with a moisture-proof buffer layer IO. Further, a space between a rear panel 8 made of a glass plate or the like disposed on the moisture-proof buffer layer 10 and the display-side substrate 1 is sealed at the periphery with an adhesive 9 such as an epoxy adhesive.
ここで、防湿緩衝層10は、前記の如く防湿ワックスを
保持する不織布にて構成されており、その周辺部におい
て透明電極2を有する表示側基板1の表面に熱圧着によ
り接着されている。Here, the moisture-proof buffer layer 10 is made of a nonwoven fabric that retains moisture-proof wax as described above, and is bonded to the surface of the display-side substrate 1 having the transparent electrode 2 at its periphery by thermocompression bonding.
上記不織布としては、これに保持させる防湿ワックスよ
りも高融点でかつ低透湿率の繊維材料からなるものが好
適であり、たとえばガラス、アルミナ、シリカなどのセ
ラミック繊維、ならびにフッ素樹脂、ポリプロピレンな
どの透湿率の小さい合成樹脂繊維からなるものが推奨さ
れる。そして、このような不織布の厚さは、0.02〜
2.00 mm程度とするのがよい。The above-mentioned nonwoven fabric is preferably made of a fiber material that has a higher melting point and lower moisture permeability than the moisture-proof wax to be retained, such as ceramic fibers such as glass, alumina, and silica, as well as fluororesin and polypropylene. It is recommended to use synthetic resin fibers with low moisture permeability. The thickness of such a nonwoven fabric is 0.02~
It is preferable to set it to about 2.00 mm.
上記不織布に保持させる防湿ワックスとしては、従来よ
りEL素子などの防湿用として使用されている種々の防
湿成分をいずれも使用可能であるが、とくに融点が50
〜150℃程度のものが好ましく、その具体例にはパラ
フィン、アククチツクポリプロピレン、アモルファスポ
リオレフィンなどが挙げられる。なお、この防湿ワック
スには、上記の如き防湿成分とともに通常ポリイソブチ
レン、天然ゴム、ポリアクリル酸エチルなどの接着付与
成分が配合される。As the moisture-proof wax retained in the nonwoven fabric, any of the various moisture-proof ingredients conventionally used for moisture-proofing EL devices etc. can be used, but waxes with a melting point of 50% are particularly suitable.
A temperature of about 150° C. is preferable, and specific examples thereof include paraffin, acid polypropylene, and amorphous polyolefin. This moisture-proof wax usually contains an adhesion-imparting component such as polyisobutylene, natural rubber, or polyethyl acrylate in addition to the above-mentioned moisture-proof component.
このような防湿ワックスを不織布に保持させるには、通
常、トルエン、キシレン、オクタン、シクロヘキサンな
どの溶剤に防湿ワックス成分を溶解した溶液ないし上記
ワックス成分と少量の溶剤を含む加熱溶融物などの液状
物を不織布に含浸させたのち、真空乾燥や加熱乾燥によ
り溶剤を揮散させればよい。この防湿ワックスの保持量
は不織布に対して1〜2.000■/ cd程度が好適
である。In order to retain such moisture-proof wax in a nonwoven fabric, a liquid material such as a solution in which a moisture-proof wax component is dissolved in a solvent such as toluene, xylene, octane, or cyclohexane, or a heated melt containing the above wax component and a small amount of solvent is usually used. After impregnating a nonwoven fabric with the nonwoven fabric, the solvent may be volatilized by vacuum drying or heat drying. The retention amount of this moisture-proof wax is preferably about 1 to 2,000 cm/cd relative to the nonwoven fabric.
発光層3は、硫化亜鉛粉末を主成分とする発光体粉末が
シアノエチル化ポリビニルアルコール、シアノエチル化
セルロースなどの高誘電率のバインダに分散されたもの
からなり、上記発光体粉末およびバインダを含む塗料を
スクリーン印刷などで表示側基板lの透明電極2上に乾
燥厚が10〜100μm程度となるように塗布、乾燥し
て形成される。The light-emitting layer 3 is composed of a luminescent powder whose main component is zinc sulfide powder dispersed in a binder with a high dielectric constant such as cyanoethylated polyvinyl alcohol or cyanoethylated cellulose, and a paint containing the luminescent powder and the binder. It is formed by coating and drying on the transparent electrode 2 of the display side substrate 1 by screen printing or the like so that the dry thickness is about 10 to 100 μm.
また、反射層4は、その反射機能により発光層3の発光
を表示側方向のみに規制して表示の明瞭化を図るもので
あり、通常、チタン酸バリウムなどの粉末が発光層3の
場合と同様のバインダで分散されたものからなり、発光
層3と同様にスクリーン印刷法などで発光層3上に乾燥
厚が5〜50μm程度となるように塗布、乾燥して形成
される。In addition, the reflective layer 4 uses its reflective function to restrict the light emitted from the light emitting layer 3 only in the direction toward the display side, thereby making the display clearer. It is made of a similar binder dispersed, and is formed by coating and drying on the light emitting layer 3 using a screen printing method or the like in the same way as the light emitting layer 3 so that the dry thickness becomes about 5 to 50 μm.
背面電極5は、Al膜やITO膜からなり、真空蒸着法
やスパッタリング法などの既存の各種真空中薄膜形成法
によって反射層4上に500〜5゜000人程炭種厚み
に形成される。The back electrode 5 is made of an Al film or an ITO film, and is formed on the reflective layer 4 to a thickness of about 500 to 5,000 layers using various existing vacuum thin film forming methods such as vacuum evaporation and sputtering.
上記構成のEL素子では、防湿緩衝層lOの防湿ワック
スが不織布に含有されたものであるため、発光層3と反
射層4および背面電極5の積層部を被覆する際、該積層
部上に載置して防湿ワックスが溶融する温度、たとえば
50−150℃、0.5〜10kg/−程度で熱圧着し
て第1図の如く周辺部を表示側基板1の表面に接着させ
ても、従来のような防湿ワックスのはみ出しを生じず、
かつ芯材である不織布により上記周辺部での厚みが充分
に確保される。したがって、従来のような防湿フィルム
を省略しても、表示側基板lと背面板8との周辺部を封
止する接着剤9の接着信幀性が高く、防湿緩衝層10の
厚みによる防湿効果が最大限に発揮され、吸湿による性
能低下を生じず、すぐれた貯蔵安定性および耐久性が得
られる。In the EL element having the above structure, since the moisture-proof wax of the moisture-proof buffer layer IO is contained in the nonwoven fabric, when covering the laminated portion of the light-emitting layer 3, reflective layer 4, and back electrode 5, the moisture-proof wax is placed on the laminated portion. Even if the peripheral part is bonded to the surface of the display side substrate 1 by thermocompression bonding at a temperature of about 50 to 150 degrees Celsius and about 0.5 to 10 kg/- at a temperature where the moisture-proof wax melts, as shown in FIG. Does not cause moisture-proof wax to protrude like
In addition, the nonwoven fabric serving as the core material ensures a sufficient thickness at the peripheral portion. Therefore, even if the conventional moisture-proof film is omitted, the adhesive 9 that seals the periphery of the display side substrate l and the back plate 8 has high adhesion reliability, and the moisture-proof effect due to the thickness of the moisture-proof buffer layer 10 is improved. is maximized, performance does not deteriorate due to moisture absorption, and excellent storage stability and durability are obtained.
なお、上述では、発光体粉末をバインダに分散した発光
層および反射層を有する分散型EL素子を例示して説明
したが、この発明は、素子要素の構成が上記例示のもの
と異なるEL素子、たとえば反射層を有さない同EL素
子や両電極間に絶縁層を介在させた同EL素子にも同様
に適用できるほか、発光層が真空中薄膜形成法にて形成
された発光付活剤を含む発光体単独の薄膜からなる薄層
型の卓絶縁形および二重絶縁形のEL素子にも適用可能
である。In addition, although the above description has been given by way of example of a dispersion type EL element having a light emitting layer and a reflective layer in which luminescent material powder is dispersed in a binder, the present invention also provides an EL element in which the configuration of element elements is different from that of the above-mentioned example; For example, it can be similarly applied to the same EL device without a reflective layer or with an insulating layer interposed between both electrodes. The present invention is also applicable to thin-layer type desk-insulated and double-insulated EL devices consisting of a thin film containing only a light emitter.
この発明によれば、素子要素の積層部を被覆する防湿緩
衝層として不織布に防湿ワックスを保持せしめたものを
使用したことにより、防湿封止の信鎖性が高く、もって
貯蔵安定性および耐久性にすぐれた高性能のEL素子を
提供できる。According to this invention, by using a nonwoven fabric holding moisture-proof wax as a moisture-proof buffer layer covering the laminated portion of the element element, reliability of moisture-proof sealing is high, and storage stability and durability are improved. It is possible to provide an EL element with excellent performance.
以下、この発明を実施例に基づいて具体的に説明する。 Hereinafter, this invention will be specifically explained based on examples.
実施例1
トルエン80重量部にパラフィン10重量部およびポリ
イソブチ1710重量部を溶解した粘稠溶液中に厚さ0
.2鶴、坪量100 g/rdのポリテトラフルオロエ
チレン繊維からなる不織布を浸漬し、真空脱気によって
上記溶液を不織布の繊維マトリックス中に含浸させたの
ち、これを取り出して60℃にて2時間乾燥し、さらに
真空中で100℃にて2時間乾燥し、防湿緩衝層用シー
トを作製した。このシートの防湿ワックス含有量は15
vt/−であった。Example 1 In a viscous solution prepared by dissolving 10 parts by weight of paraffin and 1710 parts by weight of polyisobutylene in 80 parts by weight of toluene, a film with a thickness of 0
.. A nonwoven fabric made of polytetrafluoroethylene fibers with a basis weight of 100 g/rd was immersed, the solution was impregnated into the fiber matrix of the nonwoven fabric by vacuum degassing, and then taken out and heated at 60°C for 2 hours. It was dried and further dried in a vacuum at 100° C. for 2 hours to produce a moisture-proof buffer layer sheet. The moisture-proof wax content of this sheet is 15
It was vt/-.
一方、予め片面に厚さ1.000人のITO膜からなる
所定パターンの透明電極が形成された厚さ1、1 mの
ガラス板からなる表示側基板を使用し、この基板の透明
電極側の表面に順次、硫化亜鉛を主成分とする発光体粉
末がシアノエチル化セルロース中に分散された厚さ50
μmの発光層と、チタン酸バリウム粉末がシアノエチル
化セルロース中に分散された厚さ30μmの反射層とを
スクリーン印刷にて積層形成し、さらに反射層上に抵抗
加熱蒸着法により厚さ1,000人のAl膜からなる背
面電極を積層形成した。On the other hand, a display side substrate consisting of a 1.1 m thick glass plate on which a predetermined pattern of transparent electrodes made of a 1,000-thick ITO film was formed in advance on one side was used, and the transparent electrode side of this substrate was used. On the surface, luminescent powder mainly composed of zinc sulfide is dispersed in cyanoethylated cellulose to a thickness of 50 mm.
A luminescent layer with a thickness of 1,000 μm and a reflective layer with a thickness of 30 μm in which barium titanate powder is dispersed in cyanoethylated cellulose are laminated by screen printing, and then a layer with a thickness of 1,000 μm is formed on the reflective layer by resistance heating vapor deposition. A back electrode made of a human Al film was laminated.
つぎに、この積層部上に上記で作製した防湿緩衝層用シ
ートを載置し、130℃、5kg/cdで熱圧着するこ
とにより、積層部を被覆してかつ周辺部が表示側基板の
表面に接着した防湿緩衝層を形成したところ、防湿ワッ
クスのはみ出しは全く生じなかった。ついで、この層上
に厚さ0.7mのガラス板からなる背面板を載置し、こ
の背面板と表示側基板との間の周辺部をエポキシ系接着
剤(日立化成ポリマー社製の商品名ハイボン3591)
にて接着封止して第1図で示す構成のEL素子A1を作
製した。Next, the sheet for the moisture-proof buffer layer produced above is placed on this laminated part and thermocompression bonded at 130°C and 5 kg/cd, so that the laminated part is covered and the peripheral part is the surface of the display side substrate. When a moisture-proof buffer layer was formed on the substrate, the moisture-proof wax did not protrude at all. Next, a back plate made of a glass plate with a thickness of 0.7 m is placed on this layer, and the peripheral area between this back plate and the display side substrate is glued with epoxy adhesive (trade name manufactured by Hitachi Chemical Polymer Co., Ltd.). Haibon 3591)
The EL element A1 having the structure shown in FIG. 1 was produced by adhesively sealing the product.
実施例2
パラフィン45重量部およびポリイソブチレン45重量
部とトルエン10重量部とを120℃の温度下でミキシ
ングロールにより混練し、この混練物を180℃に加熱
したのち、厚さ0.:l’n、坪量50 g/rdのガ
ラス繊維からなる不織布を浸漬し、真空説気によって上
記混練物を繊維マトリックス中に含浸させたのち、これ
を取り出してホットプレート上で150℃にて2時間加
熱し、70〜80℃に冷却後ホットプレートから剥離し
、防湿緩衝層用シートを作製した。このシートの防湿ワ
ックス保持量は18ov/cdであった。Example 2 45 parts by weight of paraffin, 45 parts by weight of polyisobutylene, and 10 parts by weight of toluene were kneaded using a mixing roll at a temperature of 120°C, and after heating this kneaded product to 180°C, a thickness of 0.5% was obtained. A nonwoven fabric made of glass fiber with a basis weight of 50 g/rd was soaked, and the kneaded material was impregnated into the fiber matrix by vacuum aeration, and then taken out and heated on a hot plate at 150°C. It was heated for 2 hours, cooled to 70 to 80°C, and then peeled off from the hot plate to produce a moisture-proof buffer layer sheet. The moisture-proof wax retention amount of this sheet was 18 ov/cd.
つぎに、このシートを用いた以外は実施例1と同様にし
てEL素子A2を作製した。なお、上記シートの熱圧着
時、防湿ワックスのはみ出しは全く生じなかった。Next, EL element A2 was produced in the same manner as in Example 1 except that this sheet was used. Note that during thermocompression bonding of the above sheet, no protrusion of the moisture-proof wax occurred.
比較例
実施例1と同様にして積層形成した素子要素の積層部上
からその周辺部外側の基板面にかけて、パラフィン10
重量部およびポリイソブチ1710重量部をトルエン1
00重量部に溶解した溶液を刷毛塗りによって塗布し、
100℃にて10時間乾燥して防湿緩衝層を形成した。Comparative Example Paraffin 10
1710 parts by weight of polyisobutylene and 1 part by weight of toluene
00 parts by weight is applied by brushing,
It was dried at 100° C. for 10 hours to form a moisture-proof buffer layer.
つぎに、この防湿緩衝層上に厚さ0.2鶴のポリテトラ
フルオロエチレン類の防湿フィルムを載置し、100℃
、5kg/aJで熱圧着してその周辺部を基板面に接着
した。このとき、上記フィルムの周縁より溶融した防湿
緩衝層成分のはみ出しを生じたが、このはみ出しはエタ
ノールにて拭き取った。続いて、上記フィルム上に実施
例1と同様に背面板を載置して、これと表示側基板との
間の周辺部を実施例1と同様に接着封止し、第3図CD
)で示す構成のEL素子Bを作製した。Next, a moisture-proof film of polytetrafluoroethylene having a thickness of 0.2 mm was placed on this moisture-proof buffer layer, and the temperature was increased to 100°C.
The peripheral portion was bonded to the substrate surface by thermocompression bonding at 5 kg/aJ. At this time, the molten moisture-proof buffer layer component protruded from the periphery of the film, but this protrusion was wiped off with ethanol. Subsequently, a back plate was placed on the film in the same manner as in Example 1, and the peripheral portion between this and the display side substrate was adhesively sealed in the same manner as in Example 1, and as shown in FIG.
) was produced.
上記実施例1.2のEL素子Al、A2と比較例のEL
素子Bの各100個について、25℃で1時間と70℃
で1時間の交互に冷熱するサイクルを30サイクル繰り
返すヒートサイクル試験を行ったのち、それぞれ50℃
、90%RHの条件下で100V、400Hzの交流電
圧を印加して輝度半減時間を調べた。その結果を第2図
に示す。EL element Al, A2 of Example 1.2 and EL of Comparative Example
For each 100 pieces of element B, 1 hour at 25°C and 70°C.
After conducting a heat cycle test in which 30 cycles of alternately heating and cooling for 1 hour were conducted, each temperature was 50°C.
The luminance half-life time was investigated by applying an alternating current voltage of 100 V and 400 Hz under conditions of , 90% RH. The results are shown in FIG.
なお、図中の各曲線の符号はEL素子の符号に対応して
いる。Note that the symbol of each curve in the figure corresponds to the symbol of the EL element.
この第2図の結果から、この発明に係るEL素子At、
A2はともに、従来構成のEL素子Bに比べ、平均の輝
度半減時間が大幅に長く長寿命であり、しかも輝度半減
時間のばらつきが小さく安定した品質性能を有すること
が明らかである。From the results shown in FIG. 2, it can be seen that the EL element At according to the present invention,
It is clear that both A2 have a significantly longer average luminance half-life time than the conventionally configured EL element B, and have stable quality performance with small variations in the luminance half-life time.
第1図はこの発明に係るエレクトロルミネッセンス素子
の構造例を示す要部の断面図、第2図はこの発明の実施
例および比較例の同素子の輝度半減時間の分布度数図、
第3図(A)〜(D)は従来の同素子の製造法を工程順
に示す断面図である。
1・・・表示側基板、2・・・透明電極、3・・・発光
層、4・・・反射層、5・・・背面電極、8・・・背面
板、9・・・接着剤、10・・・防湿緩衝層
特許出願人 日立マクセル株式会社
第1 図
禅九キ火時藺FIG. 1 is a sectional view of a main part showing a structural example of an electroluminescent device according to the present invention, FIG. 2 is a distribution frequency diagram of the luminance half-life time of the same device according to an example of the present invention and a comparative example,
FIGS. 3(A) to 3(D) are cross-sectional views showing the conventional manufacturing method of the same device in the order of steps. DESCRIPTION OF SYMBOLS 1... Display side substrate, 2... Transparent electrode, 3... Light emitting layer, 4... Reflective layer, 5... Back electrode, 8... Back plate, 9... Adhesive, 10... Moisture-proof buffer layer patent applicant Hitachi Maxell Co., Ltd.
Claims (6)
面電極とさらにこれら両電極間に介在する発光層とを含
む素子要素が積層形成され、この積層部が防湿ワツクス
を保持する不織布からなる防湿緩衝層にて被覆されると
ともに、この防湿緩衝層上に配置した背面板と上記表示
側基板とが周辺部で接着剤にて封止されてなるエレクト
ロルミネツセンス素子。(1) Element elements including a display-side transparent electrode, a back electrode, and a light-emitting layer interposed between these electrodes are laminated on a light-transmitting display-side substrate, and this laminated portion holds a moisture-proof wax. An electroluminescent element that is covered with a moisture-proof buffer layer made of non-woven fabric, and in which a back plate disposed on the moisture-proof buffer layer and the display side substrate are sealed with an adhesive at the periphery.
湿率のセラミツク繊維もしくは合成樹脂繊維からなる請
求項(1)に記載のエレクトロルミネツセンス素子。(2) The electroluminescent device according to claim 1, wherein the nonwoven fabric is made of low moisture permeability ceramic fibers or synthetic resin fibers that have a higher melting point than the moisture-proof wax.
基板に接着されてなる請求項(2)に記載のエレクトロ
ルミネツセンス素子。(3) The electroluminescent element according to claim 2, wherein the moisture-proof buffer layer is bonded to the display side substrate at its peripheral portion by thermocompression bonding.
にある請求項(1)〜(3)のいずれかに記載のエレク
トロルミネツセンス素子。(4) The electroluminescent device according to any one of claims (1) to (3), wherein the thickness of the nonwoven fabric is in the range of 0.02 to 2.00 mm.
000mg/cm^2である請求項(1)〜(4)のい
ずれかに記載のエレクトロルミネツセンス素子。(5) The moisture-proof wax retention amount of the moisture-proof buffer layer is 1 to 2,
000 mg/cm^2.
反射層を含む請求項(1)〜(5)のいずれかに記載の
エレクトロルミネツセンス素子。(6) The electroluminescent device according to any one of claims (1) to (5), wherein the device element includes a reflective layer interposed between the light emitting layer and the back electrode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63038067A JPH01213988A (en) | 1988-02-20 | 1988-02-20 | Electroluminescence element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63038067A JPH01213988A (en) | 1988-02-20 | 1988-02-20 | Electroluminescence element |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01213988A true JPH01213988A (en) | 1989-08-28 |
Family
ID=12515145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63038067A Pending JPH01213988A (en) | 1988-02-20 | 1988-02-20 | Electroluminescence element |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01213988A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5557295A (en) * | 1991-11-28 | 1996-09-17 | Nippon Seiki K.K. | Display panel |
-
1988
- 1988-02-20 JP JP63038067A patent/JPH01213988A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5557295A (en) * | 1991-11-28 | 1996-09-17 | Nippon Seiki K.K. | Display panel |
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