JPH05198375A - Thin film el display device - Google Patents
Thin film el display deviceInfo
- Publication number
- JPH05198375A JPH05198375A JP4027356A JP2735692A JPH05198375A JP H05198375 A JPH05198375 A JP H05198375A JP 4027356 A JP4027356 A JP 4027356A JP 2735692 A JP2735692 A JP 2735692A JP H05198375 A JPH05198375 A JP H05198375A
- Authority
- JP
- Japan
- Prior art keywords
- thin film
- oil
- opening
- sealing
- sealing frame
- 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.)
- Granted
Links
- 239000010409 thin film Substances 0.000 title claims abstract description 71
- 238000007789 sealing Methods 0.000 claims abstract description 75
- 239000011347 resin Substances 0.000 claims abstract description 39
- 229920005989 resin Polymers 0.000 claims abstract description 39
- 125000006850 spacer group Chemical group 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims description 40
- 238000005304 joining Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 3
- 239000010408 film Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 abstract description 34
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 49
- 229910052710 silicon Inorganic materials 0.000 description 10
- 239000010703 silicon Substances 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 229920002545 silicone oil Polymers 0.000 description 5
- 239000006059 cover glass Substances 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910004541 SiN Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000005394 sealing glass Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8723—Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
Landscapes
- Electroluminescent Light Sources (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、薄膜ＥＬ(Electrolumi
nescence）素子を絶縁性オイルにて封止した薄膜ＥＬ表
示装置に関する。このものは、例えば、車両の計器類の
自発光型のセグメント表示やマトリックス表示、或いは
他の表示装置のバックライト用の面光源などに使用され
る。BACKGROUND OF THE INVENTION The present invention relates to a thin film EL (Electrolumi
thin film EL display device in which a (nescence) element is sealed with insulating oil. This is used, for example, as a self-luminous segment display or matrix display of vehicle instruments, or as a surface light source for a backlight of another display device.
【０００２】[0002]
【従来技術】従来、薄膜ＥＬ素子は、絶縁性基板である
ガラス基板上に、電極、絶縁層、発光層、絶縁層及び電
極を順次積層し形成されている。上記発光層はＺnＳ,Ｚ
nＳe,ＳrＳ等の発光母体に発光中心としてＭn や希土類
元素等を微量ドーピングして形成される。その発光層の
両側の絶縁層はＳiＯ2，ＳiＮ,Ａl2Ｏ3 等から成る。更
に、両電極は少なくとも光取り出し側を透明とした一対
の導電膜から成る。2. Description of the Related Art Conventionally, a thin film EL element is formed by sequentially laminating an electrode, an insulating layer, a light emitting layer, an insulating layer and an electrode on a glass substrate which is an insulating substrate. The light emitting layer is ZnS, Z
It is formed by lightly doping a light-emitting matrix such as nSe or SrS with Mn or a rare earth element as a luminescent center. The insulating layers on both sides of the light emitting layer are made of SiO 2 , SiN, Al 2 O 3 or the like. Further, both electrodes are composed of a pair of conductive films which are transparent at least on the light extraction side.
【０００３】薄膜ＥＬ素子はその発光層が空気中の水分
を嫌うため、一般に、薄膜ＥＬ素子を用いた薄膜ＥＬ表
示装置は絶縁性オイルにて封止された構造とされる。こ
の構造としては、特開昭５２−７２１９７号公報「薄膜
ＥＬ装置」などにて開示され、図１０にその断面構造の
模式図を示したような薄膜ＥＬ表示装置１００が知られ
ている。上記薄膜ＥＬ表示装置１００は、薄膜ＥＬ素子
１１２が形成されたガラス基板１１１上に曲げ加工等を
施したカバーガラス１２１が接合され中空部が形成され
る。そのカバーガラス１２１の一部に穿たれた穴１２２
から、上記中空部の隙間（ギャップ）に防湿用の絶縁性
オイル１１６が注入される。そして、絶縁性オイル１１
６はシールガラス１２５にて封止されている。Since the light emitting layer of the thin film EL element does not like water in the air, a thin film EL display device using the thin film EL element is generally structured to be sealed with insulating oil. This structure is disclosed in Japanese Patent Application Laid-Open No. 52-72197, "Thin Film EL Device" and the like, and a thin film EL display device 100 having a schematic cross-sectional structure shown in FIG. 10 is known. In the thin film EL display device 100, a cover glass 121 that has been bent is joined to a glass substrate 111 on which a thin film EL element 112 is formed, and a hollow portion is formed. A hole 122 formed in a part of the cover glass 121
From this, the moisture-proof insulating oil 116 is injected into the gap of the hollow portion. And insulating oil 11
6 is sealed with a seal glass 125.
【０００４】[0004]
【発明が解決しようとする課題】上記構造の薄膜ＥＬ表
示装置１００は温度変化に伴うオイルの熱膨張による内
圧増加によりシールガラス１２５がカバーガラス１２１
から外れ易いという問題があった。このような問題を解
決するため、特公平３−４０９１６号公報「ＥＬ素子封
止構造におけるオイル注入口の封止方法」にて開示され
たものが知られている。このものは、前述した図１０の
シールガラス１２５に替えてカバーガラス１２１の穴１
２２に挿入端部が末広がり状のテーパ部を構成するシャ
フトとこのシャフトの外周に嵌合された軟質金属性のカ
ラーとを挿入する。そして、上記シャフトのみを引き上
げてそのテーパ部により上記カラーの内端部を押し広げ
て穴１２２の内側開口端部にかしめ固定するようにして
いる。このような構造から成る薄膜ＥＬ表示装置におい
ては、上述のかしめ固定のためオイルが注入される中空
部の隙間を１〜２mm以上とする必要があり、オイル容量
が多くなってしまう。すると、上述の薄膜ＥＬ表示装置
を例えば、車載用ディスプレイ装置のように周囲環境の
温度変化が激しいものに応用すると、薄膜ＥＬ表示装置
の封止構造そのものがオイルの熱膨張により機能が低下
する可能性がある。In the thin film EL display device 100 having the above structure, the seal glass 125 is covered by the cover glass 121 due to an increase in internal pressure due to thermal expansion of oil due to temperature change.
There was a problem that it was easy to come off. In order to solve such a problem, the one disclosed in Japanese Patent Publication No. 3-40916, "Method for sealing oil injection port in EL element sealing structure" is known. This is a hole 1 of the cover glass 121 in place of the seal glass 125 of FIG. 10 described above.
A shaft having an insertion end portion forming a taper portion having a divergent end and a soft metal collar fitted to the outer circumference of the shaft are inserted into the shaft 22. Then, only the shaft is pulled up, the inner end portion of the collar is expanded by the taper portion, and the inner end portion of the hole 122 is caulked and fixed. In the thin film EL display device having such a structure, it is necessary to set the gap of the hollow portion into which the oil is injected to be 1 to 2 mm or more for the above-mentioned caulking fixation, which increases the oil capacity. Then, if the above-mentioned thin film EL display device is applied to a device such as an on-vehicle display device in which the ambient temperature changes drastically, the function of the sealing structure itself of the thin film EL display device may deteriorate due to thermal expansion of oil. There is a nature.
【０００５】本発明は、上記の課題を解決するために成
されたものであり、その目的とするところは、周囲環境
の激しい温度変化に対して封入されたオイルの熱膨張に
よる封止構造の機能低下を防止した薄膜ＥＬ表示装置を
提供することである。The present invention has been made to solve the above problems, and an object of the present invention is to provide a sealing structure by thermal expansion of enclosed oil against a drastic temperature change of the surrounding environment. It is an object of the present invention to provide a thin film EL display device in which the functional deterioration is prevented.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
の発明の構成は、平板から成る絶縁性基板上に少なくと
も光取り出し側を透明とした一対の導電膜から成る電極
とそれら電極間に絶縁層−発光層−絶縁層から成る積層
構造を形成した薄膜ＥＬ素子を絶縁性オイルにて封止し
た薄膜ＥＬ表示装置であって、前記薄膜ＥＬ素子に対向
して前記絶縁性基板に接合される平板と、前記絶縁性基
板と前記平板との間の前記薄膜ＥＬ素子の積層構造の端
面方向における全周囲を前記オイルの注入口となる開口
部を除いて接合するように接合樹脂にて形成され、前記
開口部の内側にその開口幅を広げた形状とする封止枠
と、前記封止枠を形成する前記接合樹脂に所定の割合で
予め混入され、所定の外径寸法から成るスペーサと、前
記封止枠の開口部から前記オイルが注入された後、前記
開口部に接合樹脂を埋め込んで形成されるオイル封止部
とを備え、前記オイル封止部の接合樹脂は、少なくとも
前記開口部近傍の前記封止枠の一部に内側からかかるよ
うにして埋め込まれることを特徴とする。The structure of the invention for solving the above-mentioned problems is to insulate between an electrode formed of a pair of conductive films having transparent at least the light extraction side on an insulating substrate formed of a flat plate, and between the electrodes. A thin-film EL display device in which a thin-film EL element having a laminated structure including a layer, a light-emitting layer, and an insulating layer is sealed with insulating oil, the thin-film EL display device being opposed to the thin-film EL element and being bonded to the insulating substrate. It is formed of a bonding resin so as to bond the flat plate and the entire circumference in the end face direction of the laminated structure of the thin film EL element between the insulating substrate and the flat plate except the opening serving as the oil inlet. A sealing frame having a shape in which the opening width is widened inside the opening, and a spacer having a predetermined outer diameter, which is premixed in the joining resin forming the sealing frame in a predetermined ratio. Is it the opening of the sealing frame? An oil sealing portion formed by burying a bonding resin in the opening after the oil is injected, wherein the bonding resin of the oil sealing portion is at least part of the sealing frame near the opening. It is characterized in that it is embedded in the part so as to be applied from the inside.
【０００７】[0007]
【作用】平板は薄膜ＥＬ素子に対向して絶縁性基板に接
合される。接合樹脂にて形成される封止枠により上記絶
縁性基板と上記平板との間の薄膜ＥＬ素子の積層構造の
端面方向における全周囲をオイルの注入口となる開口部
を除いて接合される。この封止枠の開口部はその内側に
開口幅を広げた形状とされる。又、所定の外径寸法から
成るスペーサが、封止枠を形成する接合樹脂に所定の割
合で予め混入されている。そして、封止枠の開口部から
オイルが注入された後、オイル封止部が上記開口部を閉
じるように接合樹脂を埋め込んで形成される。このオイ
ル封止部を形成する接合樹脂は、少なくとも上記開口部
近傍の上記封止枠の一部に内側からかかるようにして埋
め込まれている。このように、本発明の薄膜ＥＬ表示装
置は薄膜ＥＬ素子の周囲で絶縁性基板と平板との間にオ
イル封止部が封止枠の開口部に形成された封止構造を有
している。上記スペーサにより上記絶縁性基板と上記平
板との接合時の隙間が一定とされる。この隙間を適当な
寸法に設定された薄膜ＥＬ表示装置では、周囲環境の激
しい温度変化にてオイルが熱膨張して内部圧力が上昇し
ても封止構造が機能低下することはない。The flat plate is bonded to the insulating substrate so as to face the thin film EL element. The entire periphery in the end face direction of the laminated structure of the thin film EL element between the insulating substrate and the flat plate is joined by the sealing frame formed of the joining resin except for the opening serving as the oil inlet. The opening of this sealing frame has a shape in which the opening width is widened inside. In addition, spacers having a predetermined outer diameter are mixed in advance in a predetermined ratio in the bonding resin forming the sealing frame. Then, after the oil is injected from the opening of the sealing frame, the oil sealing portion is formed by embedding the bonding resin so as to close the opening. The bonding resin forming the oil sealing portion is embedded in at least a part of the sealing frame near the opening so as to be applied from the inside. As described above, the thin film EL display device of the present invention has the sealing structure in which the oil sealing portion is formed in the opening of the sealing frame between the insulating substrate and the flat plate around the thin film EL element. .. The spacer keeps a constant gap when the insulating substrate and the flat plate are joined. In the thin film EL display device in which the gap is set to an appropriate size, the sealing structure does not deteriorate even if the internal pressure rises due to the thermal expansion of the oil due to the drastic temperature change of the surrounding environment.
【０００８】[0008]
【実施例】以下、本発明を具体的な実施例に基づいて説
明する。図１は本発明に係る薄膜ＥＬ表示装置１０の断
面構造を示した模式図である。又、図２はガラス基板１
１，２１を接合する場合の重ね合わせを示した説明図で
ある。薄膜ＥＬ表示装置１０は、薄膜ＥＬ素子１２が形
成された絶縁性基板であるガラス基板１１に対向して平
板であるガラス基板２１が接合されて形成されている。
このガラス基板２１には例えば、薄膜ＥＬ素子１２の発
光色と異なる発光色の薄膜ＥＬ素子２２が形成されてい
る。尚、薄膜ＥＬ表示装置１０における薄膜ＥＬ素子が
１２のみの場合には、ガラス基板１１に対向する平板と
してはガラス基板２１の他、耐熱アクリル板又は透過型
表示器でなければセラミックス板などが使用可能であ
る。ガラス基板１１とガラス基板２１とは、薄膜ＥＬ素
子１２，２２の積層構造の端面方向における全周囲を絶
縁性オイルであるシリコンオイルの注入口となる開口部
３２を除いた接合樹脂から成る封止枠３１にて接合され
ている。上記開口部３２はその内側に開口幅を広げた形
状とされる。本実施例では、図２に示したように、開口
部３２は接合樹脂から成る封止枠３１の両端面が半円形
状で対向するように形成されている。従って、開口部３
２の開口幅は封止枠３１の幅の中程から内側に向かって
広げた形状とされている。この封止枠３１を形成する接
合樹脂には所定の割合でスペーサ３５が予め混入されて
いる。このスペーサ３５としては、隙間Ｇに対応した所
定の外径寸法のガラスビーズなどから成る球体にて達成
される。EXAMPLES The present invention will be described below based on specific examples. FIG. 1 is a schematic diagram showing a cross-sectional structure of a thin film EL display device 10 according to the present invention. 2 is a glass substrate 1
It is explanatory drawing which showed the superposition at the time of joining 1 and 21. The thin film EL display device 10 is formed by bonding a glass substrate 21 which is a flat plate to a glass substrate 11 which is an insulating substrate on which the thin film EL element 12 is formed so as to face it.
On this glass substrate 21, for example, a thin film EL element 22 having an emission color different from that of the thin film EL element 12 is formed. In the case where the thin film EL display device 10 has only 12 thin film EL elements, the flat plate facing the glass substrate 11 is a glass substrate 21 or a heat-resistant acrylic plate or a ceramic plate if not a transmissive display. It is possible. The glass substrate 11 and the glass substrate 21 are sealed with a bonding resin excluding an opening 32 serving as an inlet for silicon oil, which is insulating oil, around the entire periphery of the laminated structure of the thin film EL elements 12 and 22 in the end face direction. The frames 31 are joined together. The opening 32 has a shape in which the opening width is widened inside. In this embodiment, as shown in FIG. 2, the opening 32 is formed so that both end surfaces of the sealing frame 31 made of the bonding resin are opposed to each other in a semicircular shape. Therefore, the opening 3
The opening width of No. 2 is widened from the middle of the width of the sealing frame 31 toward the inside. Spacers 35 are mixed in advance in a predetermined ratio in the bonding resin forming the sealing frame 31. The spacer 35 is realized by a spherical body made of glass beads or the like having a predetermined outer diameter dimension corresponding to the gap G.
【０００９】図２に示されたように、上下の薄膜ＥＬ素
子１２，２２の位置を合わせて接合した後、絶縁性オイ
ルであるシリコンオイル１６を開口部３２から注入し、
ガラス基板１１，２１の間の封止枠３１内に満たす。そ
して、その開口部３２に接合樹脂を後述のように滴下し
てオイル封止部３３が形成される。As shown in FIG. 2, after the upper and lower thin film EL elements 12 and 22 are aligned and joined, silicon oil 16 which is insulating oil is injected from the opening 32,
The inside of the sealing frame 31 between the glass substrates 11 and 21 is filled. Then, the bonding resin is dropped into the opening 32 as described later to form the oil sealing portion 33.
【００１０】次に、上述の図１、図２及び図３を参照し
て薄膜ＥＬ表示装置１０の製造工程を詳述する。先ず、
図２に示したように、薄膜ＥＬ素子１２を形成したガラ
ス基板１１上で薄膜ＥＬ素子１２の周囲に例えば、エポ
キシ系熱硬化性樹脂である接合樹脂をスクリーン印刷し
て封止枠３１を形成した。この封止枠３１の開口部３２
となる両端面は、印刷用スクリーンに丸い形状を与える
か又は端部の接合樹脂を予め盛り上げておくことにより
上述のような半円形状となる。尚、接合樹脂には印刷前
にガラス基板１１，２１との間の隙間Ｇに等しい直径の
小球から成るスペーサ３５を予め混入し、真空脱包した
後使用した。このスペーサ３５の混入量は接合面で４mm
2 当り数個となるように調整した。又、使用したガラス
基板１１の外形寸法は74×44mmであり、封止枠３１は幅
３mm、外形寸法を74×34mmとして印刷した。接合樹脂か
ら成る封止枠３１の印刷後、ガラス基板１１，２１が位
置ズレを起こさないよう治具にセットして両側から押さ
え、封止枠３１に熱を加えて硬化させ両ガラス基板１
１，２１を接合した。尚、実際には封止枠３１を約80℃
で一旦仮硬化させ、熱硬化時に起こる微小な位置ズレを
修正した後、更に、約 150℃まで上昇させて完全に硬化
した。Next, the manufacturing process of the thin film EL display device 10 will be described in detail with reference to FIGS. 1, 2 and 3 described above. First,
As shown in FIG. 2, on the glass substrate 11 on which the thin film EL element 12 is formed, the sealing frame 31 is formed around the thin film EL element 12 by screen-printing a bonding resin which is an epoxy thermosetting resin, for example. did. The opening 32 of the sealing frame 31
Both end surfaces to be formed into a semi-circular shape as described above by giving a round shape to the printing screen or swelling the bonding resin at the ends in advance. Before printing, a spacer 35 made of small spheres having the same diameter as the gap G between the glass substrates 11 and 21 was mixed in the bonding resin in advance, and the spacer 35 was vacuum-decapsulated before use. The amount of this spacer 35 mixed in is 4 mm at the joint surface.
It was adjusted so that there were several pieces per two . The outer dimensions of the glass substrate 11 used were 74 × 44 mm, and the sealing frame 31 was printed with a width of 3 mm and an outer dimension of 74 × 34 mm. After printing the sealing frame 31 made of the bonding resin, the glass substrates 11 and 21 are set on a jig so as not to be misaligned and pressed from both sides, and heat is applied to the sealing frame 31 to cure the both glass substrates 1.
1, 21 were joined. In addition, the sealing frame 31 is actually about 80 ° C.
After temporarily curing with, and correcting the minute positional deviation that occurs during heat curing, the temperature was further raised to about 150 ° C and completely cured.
【００１１】接合されたガラス基板１１，２１を予め加
熱して流動性をもたせたシリコンオイル中に浸し、真空
引きを行ったのち大気圧中に戻すという工程によりガラ
ス基板１１，２１の間の封止枠３１内にシリコンオイル
１６を注入した。次に、接合されたガラス基板１１，２
１をシリコンオイル中から取り出し室温まで冷却した。The bonded glass substrates 11 and 21 are preheated, dipped in fluidized silicone oil, evacuated, and then returned to atmospheric pressure to seal the glass substrates 11 and 21. Silicon oil 16 was injected into the stop frame 31. Next, the bonded glass substrates 11 and 2
1 was taken out from the silicone oil and cooled to room temperature.
【００１２】この後、図３(a)〜(d)に示した手法によ
り、封止枠３１の開口部３２に接合樹脂から成るオイル
封止部３３を形成し薄膜ＥＬ素子１２，２２を完全にシ
リコンオイル１６にて封止完了し薄膜ＥＬ表示装置１０
を形成した。開口部３２を封止するに当り、接合樹脂と
して熱硬化性樹脂を使用すると接合樹脂が加熱により完
全硬化する前にシリコンオイル１６の熱膨張による侵出
が起こるため、今回は紫外線硬化型の接合樹脂を用い
る。尚この他、２液混合反応硬化型の接合樹脂を用いる
こともできる。図３(a) に示したように、上述までの工
程でガラス基板１１，２１の間の封止枠３１内にはシリ
コンオイル１６がその開口部３２の内側近傍まで注入さ
れる。そして、図３(b) に示したように、開口部３２の
端部に接合樹脂を滴下する。すると、図３(c),(d) に示
したように、接合樹脂は毛細管現象により封止枠３１端
面に沿って開口部３２全体に広がりシリコンオイル１６
との境界線まで充填される。即ち、封止枠３１の開口部
３２からシリコンオイル１６が注入された後、その開口
部３２には接合樹脂が埋め込まれる。この接合樹脂は少
なくとも開口部３２近傍の封止枠３１の一部に内側から
かかるようにされる。図３(d) に示された状態の接合樹
脂に紫外線を照射して完全硬化させることによりオイル
封止部３３が形成される。このオイル封止部３３は上述
のように、開口部３２近傍の封止枠３１の内側まで充填
され、完全硬化されている。従って、この後にシリコン
オイル１６が熱膨張して内圧が上昇しても、オイル封止
部３３は開口部３２から抜け出るなどの不具合が生じる
恐れがない。尚、開口部３２を形成する封止枠３１の両
端面は上述の形状の他、開口部３２内側にその開口幅を
広げた形状であれば良く、図４(a),(b) に示したような
内側に広がったテーパ形状とすることもできる。After that, by the method shown in FIGS. 3A to 3D, an oil sealing portion 33 made of a bonding resin is formed in the opening 32 of the sealing frame 31 to complete the thin film EL elements 12 and 22. Thin film EL display device 10 completed with silicon oil 16
Formed. When a thermosetting resin is used as the bonding resin for sealing the opening 32, the silicone oil 16 leaches due to thermal expansion before the bonding resin is completely cured by heating. Resin is used. In addition to this, a two-component mixed reaction curing type bonding resin can also be used. As shown in FIG. 3A, the silicon oil 16 is injected into the sealing frame 31 between the glass substrates 11 and 21 up to the vicinity of the inside of the opening 32 in the above steps. Then, as shown in FIG. 3B, the bonding resin is dropped on the end of the opening 32. Then, as shown in FIGS. 3 (c) and 3 (d), the bonding resin spreads over the entire opening 32 along the end face of the sealing frame 31 due to the capillary phenomenon and the silicon oil 16
The boundary line between and is filled. That is, after the silicone oil 16 is injected from the opening 32 of the sealing frame 31, the bonding resin is embedded in the opening 32. The bonding resin is applied to at least a part of the sealing frame 31 near the opening 32 from the inside. The oil sealing portion 33 is formed by irradiating the joining resin in the state shown in FIG. 3D with ultraviolet rays to completely cure it. As described above, the oil sealing portion 33 is filled up to the inside of the sealing frame 31 in the vicinity of the opening 32 and completely hardened. Therefore, even if the silicone oil 16 thermally expands after this and the internal pressure rises, the oil sealing portion 33 does not have a problem such as slipping out from the opening 32. In addition to the above-described shape, both end surfaces of the sealing frame 31 forming the opening 32 may have a shape in which the opening width is widened inside the opening 32, as shown in FIGS. 4 (a) and 4 (b). It is also possible to have a taper shape that spreads inward as described above.
【００１３】上述したような製造工程により、薄膜ＥＬ
表示装置１０で隙間Ｇの幅寸法のみ変更したサンプルを
作成し、以下の試験を実施した。上記サンプルとして、
隙間Ｇの幅寸法を500,300,200,100,50,30,20μm とした
７種を各３個ずつ作成した。先ず、試験の前に、各サン
プルにエージング処理（本来の発光輝度を得るための電
圧を印加する前にそれより低い電圧で駆動させ、薄膜Ｅ
Ｌ素子内の製造過程で生じる weakpointを点破壊して寿
命と輝度を向上させる処理）を行った。すると、点破壊
によって生じるシリコンオイルの微小な気化により形成
される泡９１が、図５に示したように、大きく横方向に
広がり表示ムラを起こすものがあることが分かった。こ
のような表示ムラは隙間Ｇの幅寸法が20μm であるサン
プルがもっとも大きく、30μm のものにも見られた。そ
して、隙間Ｇの幅寸法が50μm 以上のサンプルには殆ど
観察されなかった。これらのサンプルにおけるシリコン
オイルの気化による表示ムラ９１は時間の経過と共に小
さくなる傾向を有するが完全に消えずに残る（特に最初
に大きな表示ムラは最後まで消えずに残る）サンプルも
あった。従って、薄膜ＥＬ表示装置１０の隙間Ｇの幅寸
法は50μm以上で作成するべきであることが分かった。By the manufacturing process as described above, the thin film EL
A sample in which only the width dimension of the gap G was changed was prepared on the display device 10, and the following test was performed. As the sample above,
Three kinds of 7 kinds each having a width dimension of the gap G of 500, 300, 200, 100, 50, 30, 20 μm were prepared. First, before the test, each sample was subjected to an aging treatment (driving at a lower voltage before applying a voltage for obtaining the original light emission luminance), and the thin film E
The weak point generated in the manufacturing process in the L element was subjected to point destruction to improve the life and brightness. Then, it was found that the bubbles 91 formed by minute vaporization of the silicon oil caused by the point destruction spread widely in the horizontal direction and cause display unevenness, as shown in FIG. Such display unevenness was greatest in the sample in which the width dimension of the gap G was 20 μm, and was also observed in the sample of 30 μm. And, it was hardly observed in the sample in which the width dimension of the gap G was 50 μm or more. The display unevenness 91 in these samples due to vaporization of silicon oil tends to become smaller with the passage of time, but there was also a sample in which the display unevenness remained completely (particularly, the large display unevenness remained at first until the end). Therefore, it was found that the width dimension of the gap G of the thin film EL display device 10 should be 50 μm or more.
【００１４】そこで、結果的に残ったサンプルである隙
間Ｇの幅寸法が500〜50μmの５種について、 100℃恒温
とした高温放置試験を実施した。その結果を図６に示し
た。試験開始後間もなく、隙間Ｇの幅寸法が500μmのサ
ンプルの１つがガラス破壊、１つが接合樹脂の割れによ
り破損し、共にオイル漏れを起こした。次に、残りのサ
ンプルに対して０〜 100℃間の冷熱衝撃試験を実施した
ところ、図７に示したような結果となった。残りの隙間
Ｇの幅寸法が500μmのサンプルも破壊し、隙間Ｇの幅寸
法が300μmのサンプルの２つにオイル漏れは無かったが
接合樹脂のひび割れが見られた。又、上述の実施例の薄
膜ＥＬ表示装置１０におけるオイル封止部３３と封止枠
３１との界面に異常は見られなかった。そして、更に、
残りのサンプルに対して温度95℃，湿度 100％の高温高
湿試験を実施した。その結果を図８に示した。熱衝撃と
しては上述の冷熱衝撃試験よりも緩やかであり、何れの
サンプルにも異常は見られなかった。Therefore, a high temperature storage test was carried out at a constant temperature of 100 ° C. for the five kinds of samples having the width G of the gap G of 500 to 50 μm as a result. The results are shown in Fig. 6. Shortly after the start of the test, one of the samples having a width dimension of the gap G of 500 μm was broken by glass, and one was broken by cracking of the bonding resin, and both of them caused oil leakage. Next, a thermal shock test between 0 and 100 ° C. was performed on the remaining samples, and the results shown in FIG. 7 were obtained. The remaining sample with the width dimension of the gap G of 500 μm was also destroyed, and no oil leakage was found in two of the samples with the width dimension of the gap G of 300 μm, but cracks of the bonding resin were observed. Further, no abnormality was found at the interface between the oil sealing portion 33 and the sealing frame 31 in the thin film EL display device 10 of the above-described embodiment. And further,
The remaining samples were subjected to a high temperature and high humidity test at a temperature of 95 ° C and a humidity of 100%. The result is shown in FIG. The thermal shock was slower than that in the above thermal shock test, and no abnormality was found in any of the samples.
【００１５】以上説明したように、本発明の薄膜ＥＬ表
示装置は、封入されるオイルの熱膨張による封止構造の
機能低下を防止することができる。上述の実施例におけ
る薄膜ＥＬ表示装置では、２つの異なる発光色から成る
薄膜ＥＬ素子を形成した２つのガラス基板を接合した構
造を示した。このような、薄膜ＥＬ表示装置の構造にお
いては、従来の封止用のシールガラスを設ける必要がな
いため、透過型とした場合でも見栄えが悪くなるような
ことはない。又、薄膜ＥＬ素子同士を接近させることが
できるため、斜めから見た場合の薄膜ＥＬ素子間のパタ
ーンずれが目立たないという効果がある。更に、図９に
示したように、３つの異なる発光色から成る薄膜ＥＬ素
子５２，６２，７２をそれぞれ形成した３つのガラス基
板５１，６１，７１の間を封止枠５５，６５にてそれぞ
れ接合した薄膜ＥＬ表示装置５０を構成する。尚、それ
らガラス基板５１，６１，７１の間は、それぞれ上述の
実施例と同様なシリコンオイルによる封止構造を持つ。
このような構成から成る薄膜ＥＬ表示装置５０はマルチ
カラー表示を達成することができる。As described above, the thin-film EL display device of the present invention can prevent the functional deterioration of the sealing structure due to the thermal expansion of the enclosed oil. In the thin film EL display device in the above-mentioned embodiment, the structure in which the two glass substrates on which the thin film EL elements having two different emission colors are formed is joined is shown. In such a structure of the thin film EL display device, since it is not necessary to provide the conventional sealing glass for sealing, even if it is of a transmissive type, the appearance does not deteriorate. Further, since the thin film EL elements can be brought close to each other, there is an effect that a pattern shift between the thin film EL elements when viewed from an angle is not noticeable. Further, as shown in FIG. 9, sealing frames 55 and 65 are provided between the three glass substrates 51, 61 and 71 on which the thin film EL elements 52, 62 and 72 having three different emission colors are formed, respectively. The bonded thin film EL display device 50 is configured. Between the glass substrates 51, 61 and 71, there is a sealing structure similar to that of the above-described embodiment made of silicon oil.
The thin film EL display device 50 having such a configuration can achieve multi-color display.
【００１６】[0016]
【発明の効果】本発明は、接合樹脂に所定の外径寸法か
ら成るスペーサを所定の割合で予め混入し、その接合樹
脂にて薄膜ＥＬ素子の周囲で絶縁性基板と平板との間に
内側に開口幅を広げた開口部を有する封止枠を形成し、
その開口部から絶縁性オイルを注入した後、その開口部
を閉じるように少なくともその近傍の封止枠の一部に内
側からかかるように接合樹脂を埋め込みオイル封止部が
形成されており、このオイル封止部は封止枠の開口部を
確実に封止できる。そして、スペーサにより絶縁性基板
と平板との間の隙間を正確に設定して注入されるオイル
量を必要最小限とすることができ周囲環境の激しい温度
変化に対してもその封止構造の機能低下を防止できる。According to the present invention, spacers having a predetermined outer diameter are mixed in advance in a predetermined ratio in the bonding resin, and the bonding resin is applied inside the insulating substrate and the flat plate around the thin film EL element. To form a sealing frame with an opening that widens the opening width,
After injecting the insulating oil from the opening, an oil sealing portion is formed by embedding the bonding resin so as to cover the opening from at least a part of the sealing frame in the vicinity thereof from the inside. The oil sealing portion can reliably seal the opening of the sealing frame. The spacer allows the gap between the insulating substrate and the flat plate to be set accurately to minimize the amount of oil injected, and the function of the sealing structure even when the ambient temperature changes drastically. It can prevent the deterioration.
【図１】本発明の具体的な一実施例に係る薄膜ＥＬ表示
装置の断面構造を示した模式図である。FIG. 1 is a schematic view showing a cross-sectional structure of a thin film EL display device according to a specific example of the present invention.
【図２】同実施例に係る薄膜ＥＬ表示装置のガラス基板
同士を接合する場合の重ね合わせを示した説明図であ
る。FIG. 2 is an explanatory diagram showing superposition when the glass substrates of the thin film EL display device according to the example are bonded together.
【図３】同実施例に係る薄膜ＥＬ表示装置のオイル封止
部の詳細な形成手法を示した説明図である。FIG. 3 is an explanatory diagram showing a detailed method of forming an oil sealing portion of the thin film EL display device according to the embodiment.
【図４】本発明の薄膜ＥＬ表示装置における封止枠の開
口部における他の端面形状を示した説明図である。FIG. 4 is an explanatory diagram showing another end face shape in the opening of the sealing frame in the thin film EL display device of the present invention.
【図５】表示ムラを起こしたサンプルの状態を示した説
明図である。FIG. 5 is an explanatory diagram showing a state of a sample having display unevenness.
【図６】サンプルに対して 100℃恒温とした高温放置試
験を実施した結果を示した説明図である。FIG. 6 is an explanatory diagram showing the results of a high temperature storage test in which a sample was kept at a constant temperature of 100 ° C.
【図７】サンプルに対して０〜 100℃間の冷熱衝撃試験
を実施した結果を示した説明図である。FIG. 7 is an explanatory diagram showing a result of performing a thermal shock test between 0 and 100 ° C. on a sample.
【図８】サンプルに対して温度95℃，湿度 100％の高温
高湿試験を実施した結果を示した説明図である。FIG. 8 is an explanatory diagram showing the results of conducting a high temperature and high humidity test on a sample at a temperature of 95 ° C. and a humidity of 100%.
【図９】本発明の薄膜ＥＬ表示装置の他の実施例の断面
構造を示した模式図である。FIG. 9 is a schematic view showing a cross-sectional structure of another embodiment of the thin film EL display device of the present invention.
【図１０】従来の薄膜ＥＬ表示装置の断面構造を示した
模式図である。FIG. 10 is a schematic diagram showing a cross-sectional structure of a conventional thin film EL display device.
１０−薄膜ＥＬ表示装置 １１−ガラス基板 １２
−薄膜ＥＬ素子 １６−シリコンオイル（絶縁性オイル） ２１−ガラ
ス基板（平板） ２２−薄膜ＥＬ素子 ３１−封止枠 ３２−開口部 ３３−オイル封止部 ３５−スペーサ Ｇ−隙間10-Thin film EL display device 11-Glass substrate 12
-Thin film EL element 16-Silicon oil (insulating oil) 21-Glass substrate (flat plate) 22-Thin film EL element 31-Sealing frame 32-Opening 33-Oil sealing section 35-Spacer G-Gap
───────────────────────────────────────────────────── フロントページの続き (72)発明者 井ノ口 和宏 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Inoguchi 1-1, Showa-cho, Kariya city, Aichi Prefecture
Claims (1)
光取り出し側を透明とした一対の導電膜から成る電極と
それら電極間に絶縁層−発光層−絶縁層から成る積層構
造を形成した薄膜ＥＬ素子を絶縁性オイルにて封止した
薄膜ＥＬ表示装置であって、 前記薄膜ＥＬ素子に対向して前記絶縁性基板に接合され
る平板と、 前記絶縁性基板と前記平板との間の前記薄膜ＥＬ素子の
積層構造の端面方向における全周囲を前記オイルの注入
口となる開口部を除いて接合するように接合樹脂にて形
成され、前記開口部の内側にその開口幅を広げた形状と
する封止枠と、 前記封止枠を形成する前記接合樹脂に所定の割合で予め
混入され、所定の外径寸法から成るスペーサと、 前記封止枠の開口部から前記オイルが注入された後、前
記開口部に接合樹脂を埋め込んで形成されるオイル封止
部とを備え、前記オイル封止部の接合樹脂は、少なくと
も前記開口部近傍の前記封止枠の一部に内側からかかる
ようにして埋め込まれることを特徴とする薄膜ＥＬ表示
装置。1. A thin film EL having a laminated structure of an insulating layer, a light emitting layer, and an insulating layer formed between a pair of electrodes made of a conductive film having at least a transparent side on a light extraction side on an insulating substrate made of a flat plate. A thin film EL display device in which an element is sealed with an insulating oil, the flat plate being opposed to the thin film EL element and bonded to the insulating substrate, and the thin film between the insulating substrate and the flat plate. The EL element is formed of a bonding resin so as to bond the entire circumference of the laminated structure in the end face direction except the opening serving as the oil inlet, and the opening width is widened inside the opening. A sealing frame, and a spacer having a predetermined outer diameter, which is premixed in the joining resin forming the sealing frame in a predetermined ratio, and after the oil is injected from the opening of the sealing frame, Bonding resin to the opening An oil sealing portion formed by embedding, and the bonding resin of the oil sealing portion is embedded in at least a part of the sealing frame near the opening so as to be applied from the inside. Thin film EL display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4027356A JP2837013B2 (en) | 1992-01-17 | 1992-01-17 | EL display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4027356A JP2837013B2 (en) | 1992-01-17 | 1992-01-17 | EL display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05198375A true JPH05198375A (en) | 1993-08-06 |
| JP2837013B2 JP2837013B2 (en) | 1998-12-14 |
Family
ID=12218766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4027356A Expired - Lifetime JP2837013B2 (en) | 1992-01-17 | 1992-01-17 | EL display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2837013B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691738A (en) * | 1994-03-30 | 1997-11-25 | Nippondenso Co., Ltd. | Thin-film electroluminescent display and method of fabricating same |
| WO2000007170A1 (en) * | 1998-07-27 | 2000-02-10 | Seiko Epson Corporation | Electro-optical device, method of manufacture thereof, projection display, and electronic device |
| JP2003501792A (en) * | 1999-06-03 | 2003-01-14 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Organic electroluminescent device |
| KR20030044659A (en) * | 2001-11-30 | 2003-06-09 | 오리온전기 주식회사 | Organic Light Emitting Diodes |
| KR100407487B1 (en) * | 1996-09-25 | 2004-03-20 | 삼성에스디아이 주식회사 | Field effect electron emitting device and method for sealing the same |
| KR100522689B1 (en) * | 2003-03-14 | 2005-10-20 | 삼성에스디아이 주식회사 | Electroluminescence device |
| WO2006101378A1 (en) * | 2005-03-25 | 2006-09-28 | Lg Electronics Inc. | Light emitting device |
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| US7700958B2 (en) | 2002-07-05 | 2010-04-20 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device having pixel portion surrounded by first sealing material and covered with second sealing material |
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1992
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