JPS60119595A - El display unit - Google Patents
El display unitInfo
- Publication number
- JPS60119595A JPS60119595A JP58226944A JP22694483A JPS60119595A JP S60119595 A JPS60119595 A JP S60119595A JP 58226944 A JP58226944 A JP 58226944A JP 22694483 A JP22694483 A JP 22694483A JP S60119595 A JPS60119595 A JP S60119595A
- Authority
- JP
- Japan
- Prior art keywords
- back electrode
- layer
- display device
- display
- thin film
- 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
- 239000010409 thin film Substances 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 8
- 230000031700 light absorption Effects 0.000 claims description 5
- 229920001721 polyimide Polymers 0.000 claims description 2
- 239000009719 polyimide resin Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 125000000664 diazo group Chemical group [N-]=[N+]=[*] 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、薄膜ＫＬ素子を用いたＩ・ロア表示装置ｌこ
関し、特に薄膜ＥＬ素子の耐湿保、？Ｉｉを高め、かつ
表示コントラストを改善したＥＬＬ示装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an I/lower display device using a thin-film KL element, and particularly to moisture-resistance and maintenance of a thin-film EL element. The present invention relates to an ELL display device with increased Ii and improved display contrast.
従来の耐湿構造を備えたＥＬＬ示装置の一例を第１図に
示して説明する。Ｗ、１図はその概略断面を示すもので
、透光性のガラス基板１上にＩＴＯなどからなる透明１
を極２が所定パターンを有して形成されている。この透
明１硯極２上にはＡ４２０３などの第１絶縁層３ 、Ｚ
ｎＳ：Ｍｎなどの発光層４およびＡｔ２０３などの第２
絶縁層５が順次積層して形成され、さらに第２絶縁層５
上には透明電極２と対向して所定パターンの背面電極７
が形成されていて、一対の電極となる透明％極２と背面
電極７間に１発＞’（ｗ Ｉ団４を第１絶縁層３と第２
絶縁層５とで挟んだザンドインテ構造のＥＬ層６が介在
され薄膜Ｅ Ｌ素子を構成している。そして、前記ガラ
ス基板１上には外囲器としてのパンケージ８が封着剤９
で封荒されて上記薄膜ＥＬ素子を気密封止し、これらガ
ラス基板１とパンケージ８により気密容器を構成してい
る。才だ、前記パッケージ８の内面には薄膜Ｅ Ｌ素子
の水分による劣化を保護するためにシリカゲルなどの吸
湿層１０が施されている。An example of a conventional ELL display device having a moisture-resistant structure is shown in FIG. 1 and will be described. W, Figure 1 shows a schematic cross section of the same, in which a transparent substrate 1 made of ITO or the like is placed on a transparent glass substrate 1.
The pole 2 is formed with a predetermined pattern. A first insulating layer 3 such as A4203, Z
A light emitting layer 4 such as nS:Mn and a second layer such as At203
Insulating layers 5 are sequentially laminated, and a second insulating layer 5 is formed.
On top, a back electrode 7 with a predetermined pattern is arranged opposite to the transparent electrode 2.
is formed between the transparent electrode 2 and the back electrode 7, which form a pair of electrodes.
An EL layer 6 having a ZandInte structure is sandwiched between an insulating layer 5 and constitutes a thin film EL element. A pan cage 8 as an envelope is placed on the glass substrate 1 with a sealing agent 9.
The glass substrate 1 and the pan cage 8 constitute an airtight container. A moisture absorbing layer 10 made of silica gel or the like is applied to the inner surface of the package 8 to protect the thin film EL element from deterioration due to moisture.
ところで、このような構造のＥＬ表示装置において、上
記９１層６は一般に透光性を有しており、表示コントラ
ストを改善するために、所定パターン形成の背面電極７
に黒色化電極を用い、その背面電極Ｉが形成されていな
い電極間隙部１１を黒色化すべく黒色の背景板１２が上
記吸湿層１０上に背面電極Ｉと対向して設けられている
。ここで、前記背景板１２を背面電極７に密尤−させな
いのは次の理由による。すなわち、ＥＬ層６の微小欠陥
部分で絶縁破壊が生じた際その絶縁破壊部の背面電極材
料が飛散し局部的に微小孔となり、非発光状態になる。Incidentally, in an EL display device having such a structure, the 91 layer 6 is generally translucent, and in order to improve display contrast, a back electrode 7 formed with a predetermined pattern is used.
A black background plate 12 is provided on the moisture absorption layer 10 facing the back electrode I in order to blacken the electrode gap 11 where the back electrode I is not formed. Here, the reason why the background plate 12 is not closely attached to the back electrode 7 is as follows. That is, when dielectric breakdown occurs in a microdefect part of the EL layer 6, the back electrode material at the dielectric breakdown part scatters and locally becomes a micropore, resulting in a non-emissive state.
しかし、それ以外の部分で目、正常な発光を呈し、非発
光部は微小であり、表示ＶＣは何ら支障をきたさない。However, the eyes exhibit normal light emission in other parts, and the non-light emitting parts are minute, so that the display VC is not affected in any way.
ところが、背面電極７に背景板１２などを密着した場合
は、絶縁破壊が生じた箇所で背面電極材料の飛散が起こ
らず対向電極である透明電極２と短絡し、過電流が流れ
て発熱し電極の断線を招くためである。However, when the background plate 12 or the like is placed in close contact with the back electrode 7, the back electrode material does not scatter at the location where dielectric breakdown occurs, and it short-circuits with the transparent electrode 2, which is the opposing electrode, causing an overcurrent to flow and heat up the electrode. This is because it may lead to disconnection.
このように、上記した従来のＥＬ表示装置においては、
背景板１２がパッケージ８内に施された吸湿層１０を覆
う構造となっているため、その吸湿層本来の吸湿能力が
低下し、また背景板１２の大きさの制限から表示周辺部
まで黒色化できないブξめ、表示コントラストの角度依
存性が生じて表示が見にくくなるなどの欠点を有してい
た。In this way, in the conventional EL display device described above,
Since the background plate 12 has a structure that covers the moisture absorbing layer 10 provided inside the package 8, the inherent moisture absorption ability of the moisture absorbing layer decreases, and due to the size limitations of the background plate 12, even the periphery of the display becomes black. However, it has disadvantages such as angle dependence of display contrast, which makes the display difficult to see.
本発明は以上の点に鑑み、かかる従来の欠点を解決する
ためになされたもので、その目的は、薄膜ＥＩ、素子の
耐湿採掘を高め、しかも表示コントラストを向上させる
ことができるＥＬ表示装置を提供することにある。In view of the above points, the present invention was made in order to solve the conventional drawbacks, and its purpose is to provide an EL display device that can improve the thin film EI, the moisture resistance of the element, and the display contrast. It is about providing.
このような目的を達成するために、本発明は、透光性基
板とパッケージとからなる気密容器内に透光性を有する
薄膜ＥＬ素子を構成し、前記パッケージ内に吸湿層が施
されたＥＬ表示装置において、前記薄膜ＥＬ素子のパタ
ーン形成された背面電極と同一平面上でかつ該背面電極
を除く部分に、感光性樹脂からなる光吸収層を形成する
ことにより、表示周辺部まで均一に表示コントラストを
得るようにしたものでおる。以下、本発明の実施例を図
面に基いて説明する。In order to achieve such an object, the present invention comprises a light-transmitting thin film EL element in an airtight container consisting of a light-transmitting substrate and a package, and an EL element with a moisture absorption layer provided inside the package. In a display device, by forming a light absorption layer made of a photosensitive resin on the same plane as the patterned back electrode of the thin film EL element and excluding the back electrode, uniform display can be achieved up to the periphery of the display. It is designed to provide contrast. Embodiments of the present invention will be described below with reference to the drawings.
第２図は本発明の一実施例によるＥＬ表示装置の概略構
造断面図であり、同図において第１図と同一または相当
部分は同一符号を付しである。この実施例では、透光性
のガラス基板１上に透明電極２．ＥＬ層６および背面電
極７を従来と同様にして積層形成したうえ、例えばジア
ゾ感光剤を添加した感光性ＦＡＡ（ポリアクリルアミド
）を薄膜ＥＬ素子の表示部全面に塗布し、この塗布膜２
０を乾燥する。このときＰＡＡ塗布膜２０の膜厚は背面
電極７よシ厚い方が望ましく、１〜１０μｍ程度が適当
である。次いで、上記ＰＡＡ塗布膜２０は感光性を有す
るため、そのＰＡＡ塗布膜２０をガラス基板１側から紫
外線露光したのち、現像液を用いて現像する。すると、
第２図に示す如く、背面電極Ｔを除く部分だけＫＰＡＡ
塗布膜２０が形成される。Ｌ２かる後、前記ＰＡＡ塗布
膜２０を空気中にて３００℃、１０分間程度焼成するこ
とにより、その塗布膜２０が黒褐色化し、この黒褐色の
ＰＡＡ塗布膜２０を光吸収層として形成したものである
。FIG. 2 is a schematic cross-sectional view of the structure of an EL display device according to an embodiment of the present invention, in which the same or corresponding parts as in FIG. 1 are designated by the same reference numerals. In this embodiment, transparent electrodes 2. The EL layer 6 and the back electrode 7 are laminated in the same manner as before, and then a photosensitive FAA (polyacrylamide) added with, for example, a diazo photosensitive agent is applied to the entire surface of the display area of the thin film EL element.
Dry 0. At this time, the thickness of the PAA coating film 20 is desirably thicker than the back electrode 7, and is suitably about 1 to 10 μm. Next, since the PAA coating film 20 has photosensitivity, the PAA coating film 20 is exposed to ultraviolet light from the glass substrate 1 side, and then developed using a developer. Then,
As shown in Figure 2, only the part excluding the back electrode T is KPAA.
A coating film 20 is formed. After L2, the PAA coating film 20 is baked in air at 300° C. for about 10 minutes to turn the coating film 20 blackish brown, and this blackish brown PAA coating film 20 is formed as a light absorption layer. .
また、感光性樹脂としては上記ＦＡＡ以外にポリイミド
樹脂、フオートニース（商品名）などを使用することも
できる。Further, as the photosensitive resin, other than the above-mentioned FAA, polyimide resin, PhotoNice (trade name), etc. can also be used.
このように、上記実施例の構造によると、パッケージ８
内に施された吸湿層１０はその表面が従来のように背景
板１２によって制限されることなく、完全に露出される
ので、十分な吸湿能力を発揮でき、薄膜ＥＬ素子の耐湿
保護を高めることができる。また、薄膜ＥＬ素子の表示
部全面を背面電極７と黒褐色のＰＡＡ塗布膜２０とによ
って覆うことができるので、その表示周辺部まで均一に
表示コントラストを改善でき、非常に見易いＥＬ表示装
置が作製できる。しかも、薄膜ＥＬ素子の背面電極部は
、上記ＰＡＡ塗布膜２０にて凹形状になっているため、
その塗布膜が機械的保設膜としても作用し、引っかき等
による背面電極ｒの断線が防止でき、表示装置の取扱い
が容易となる。In this way, according to the structure of the above embodiment, the package 8
The surface of the moisture-absorbing layer 10 applied inside is completely exposed without being restricted by the background plate 12 as in the conventional case, so that it can exhibit sufficient moisture-absorbing ability and enhance the moisture-resistant protection of the thin film EL element. I can do it. Furthermore, since the entire display area of the thin-film EL element can be covered with the back electrode 7 and the black-brown PAA coating film 20, the display contrast can be uniformly improved up to the periphery of the display, making it possible to produce an EL display device that is extremely easy to see. . Moreover, since the back electrode portion of the thin film EL element has a concave shape due to the PAA coating film 20,
The coating film also acts as a mechanical retention film, preventing disconnection of the back electrode r due to scratches, etc., and making the display device easier to handle.
以上説明したように１本発明のＥＬ表示装置によれば、
透光性を有する薄膜ＥＬ素子パターン形成された背面電
極と同一平面上でかつ該背面電極を除く部分に、感光性
樹脂からなる光吸収層を施すことにより、背景板を不要
にできるので、吸湿層の吸湿能力を十分に発揮できると
ともに、表示周辺部まで均一な表示コントラスかに？ｔ
られ、したがって、高寿命で表示の見易いＥＬ表示装置
を提供することが可能になる。As explained above, according to the EL display device of the present invention,
By applying a light-absorbing layer made of a photosensitive resin on the same plane as the patterned back electrode of a thin-film EL element with light-transmitting properties, and excluding the back electrode, a background plate can be made unnecessary, thereby reducing moisture absorption. Is it possible to fully utilize the moisture absorption capacity of the layer and achieve uniform display contrast to the periphery of the display? t
Therefore, it is possible to provide an EL display device with a long life and easy-to-read display.
第１図は従来の−・例を示すＥＬ表示装置の概略断面図
、第２図は本発明の一実施例によるＥ Ｌ表示装置の概
略断面図である。
１・・・・ガラス基板、２・・・・透明電極、３・・・
・第１絶縁層、４・・・・発光層、５・・・・第２絶縁
層、６・・・・Ｅ Ｌ層、Ｉ・・・・背面電極、８・・
・・パッケージ、９・・・・封着剤、１０・・・・吸湿
層、２０・・・・ＰＡＡ塗布膜（光吸収層）。FIG. 1 is a schematic sectional view of a conventional EL display device, and FIG. 2 is a schematic sectional view of an EL display device according to an embodiment of the present invention. 1...Glass substrate, 2...Transparent electrode, 3...
・First insulating layer, 4... Light emitting layer, 5... Second insulating layer, 6... E L layer, I... Back electrode, 8...
...Package, 9...Sealing agent, 10...Moisture absorption layer, 20...PAA coating film (light absorption layer).
Claims (2)
透ｙＣ性を有する薄膜ＥＬ索子を構成し、前記パツク−
−ジ内（／（吸湿層が施された構造のｇｒ、８示装置に
おいて、前記薄膜ＥＬ素子のパターン形成された背面電
極と同一・平ＩＢｊ上でかつ該背面′、１スを除く部分
に、光吸収Ｊ【（を施したことを特がとするＥＬ衣衣装
装置(1) A thin film EL string having transparent YC properties is constructed in an airtight container consisting of a transparent substrate and a package, and the package is
- In the (/(gr, 8 device with a structure provided with a moisture absorbing layer, on the same flat IBj as the patterned back electrode of the thin film EL element and on the back surface', excluding the 1st space) , an EL clothing device that is characterized by having a light absorption J[(
ミド樹脂などの感−）’（−、性樹脂からなることを特
徴とする特許請求の範囲第１項記載のＥＬＬ示装置。(2) The ELL display device according to claim 1, wherein the light absorption layer is made of a polyacrylhumide or polyimide resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58226944A JPS60119595A (en) | 1983-12-02 | 1983-12-02 | El display unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58226944A JPS60119595A (en) | 1983-12-02 | 1983-12-02 | El display unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60119595A true JPS60119595A (en) | 1985-06-27 |
Family
ID=16853057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58226944A Pending JPS60119595A (en) | 1983-12-02 | 1983-12-02 | El display unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60119595A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55124182A (en) * | 1979-03-16 | 1980-09-25 | Sharp Kk | Thin film el panel |
-
1983
- 1983-12-02 JP JP58226944A patent/JPS60119595A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55124182A (en) * | 1979-03-16 | 1980-09-25 | Sharp Kk | Thin film el panel |
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