【０００１】[0001]
【発明の属する技術分野】本発明は、異なる発光色を呈
する２つの薄膜ＥＬ(Electro Luminescence)素子を有し
て、表示装置に用いらる多色表示が可能な多色表示ＥＬ
パネルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-color display EL having two thin-film EL (Electro Luminescence) elements exhibiting different emission colors and capable of multi-color display used in a display device.
About the panel.
【０００２】[0002]
【従来の技術】一般に、薄膜ＥＬ素子は、薄型平面ディ
スプレイに用いられる発光素子で、透明電極を含む一対
の電極間に薄膜蛍光体の発光層および薄膜絶縁層を設け
てなり、電極間に交流電圧を印加することによって発光
する。発光色は、発光層の材料によって決まり、Ｚｎ
Ｓ:Ｍnを用いた黄橙色、ＣaＳ:Ｅu，ＺnＳ:Ｓmを用いた
赤色、ＺnＳ:Ｔb，ＣaＳ:Ｃeを用いた緑色、ＳrＳ:Ｃ
e，ＺnＳ:Ｔmを用いた青色の各薄膜ＥＬ素子が知られて
いる。現在、ＺnＳ:Ｍnの発光層をもつ黄橙色の単色デ
ィスプレイが実用化されるとともに、応用範囲拡大のた
めに多色ディスプレイの開発が行なわれている。薄膜Ｅ
Ｌ素子による多色ディスプレイの方式には、発光色の異
なる複数の発光層をエッチングによって平面的に配列し
てカラー表示するもの、単色の発光層に色フィルタを組
み合わせてカラー表示するものがある。2. Description of the Related Art In general, a thin-film EL device is a light-emitting device used for a thin flat display, in which a light-emitting layer of a thin-film phosphor and a thin-film insulating layer are provided between a pair of electrodes including a transparent electrode. Light is emitted by applying a voltage. The luminescent color is determined by the material of the luminescent layer.
S: yellow-orange using Mn, red using CaS: Eu, ZnS: Sm, green using ZnS: Tb, CaS: Ce, SrS: C
e, each of the blue thin-film EL devices using ZnS: Tm is known. At present, a yellow-orange single-color display having a ZnS: Mn light-emitting layer has been put to practical use, and a multicolor display has been developed to expand the range of application. Thin film E
As a method of a multicolor display using an L element, there are a method of displaying a plurality of light-emitting layers having different emission colors in a plane by etching to perform color display, and a method of displaying a color by combining a single-color light-emitting layer with a color filter.
【０００３】また、これらと異なる方式として、最近、
図４に示すような多色表示ＥＬパネルが提案されている
(特公平４−３５９号公報)。この多色表示ＥＬパネル
は、透光性のガラス基板１１上に、順次透明電極１２,
両側をＡｌ2Ｏ3などの透光性絶縁膜で覆われたＺnＳ:Ｔ
bからなる(緑色)発光層１３,透明電極１４を形成してな
る第１のＥＬ素子１０と、同様のガラス基板２１上に、
順次不透明電極２２,両側を同様の膜で覆われたＺnＳ:
Ｍnからなる(黄橙色)発光層２３,透明電極２４を形成し
てなる第２のＥＬ素子２０と、発光層１３,２３側を対
向させて配置した両ＥＬ素子１０,２０を所定間隙に保
ち、かつこの所定間隙を気密に封止するプラスチック製
のスペーサ３１と、上記所定間隙に防湿のために充填さ
れるシリコンオイルまたはエポキシ樹脂などの透明絶縁
物質３２とで構成される。そして、第１,第２のＥＬ素
子１０,２０を交流電圧で駆動することにより、第１の
発光層１３からは緑色光１７が、第２の発光層２３から
は黄橙色光２７が発せられ、不透明電極２２と逆のガラ
ス基板１１を経て外部へ出る。従って、緑色,黄橙色お
よびこれらの混合色からなる多色表示が行なわれる。[0003] Also, recently, as a different system,
A multi-color display EL panel as shown in FIG. 4 has been proposed.
(Japanese Patent Publication No. 4-359). The multi-color display EL panel includes a transparent glass substrate 11, a transparent electrode 12,
ZnS: T covered on both sides with a translucent insulating film such as Al2 O3
The same as the first EL element 10 in which the (green) light emitting layer 13 composed of b and the transparent electrode 14 are formed,
An opaque electrode 22, ZnS covered on both sides with a similar film in sequence:
The second EL element 20 having the Mn (yellow-orange) light-emitting layer 23 and the transparent electrode 24 formed thereon and the two EL elements 10 and 20 arranged with the light-emitting layers 13 and 23 facing each other are kept at a predetermined gap. The space is made up of a plastic spacer 31 that hermetically seals the predetermined gap, and a transparent insulating material 32 such as silicone oil or epoxy resin that fills the predetermined gap for moisture prevention. By driving the first and second EL elements 10 and 20 with an AC voltage, green light 17 is emitted from the first light emitting layer 13 and yellow-orange light 27 is emitted from the second light emitting layer 23. Out through the glass substrate 11 opposite to the opaque electrode 22. Therefore, a multicolor display consisting of green, yellow-orange, and a mixture thereof is performed.
【０００４】[0004]
【発明が解決しようとする課題】ところが、上記従来の
多色表示ＥＬパネルは、スペーサ３１で封止された第
１,第２のＥＬ素子１０,２０の間の間隙に透明絶縁物質
３２を充填したにすぎないため、この透明絶縁物質が固
体のエポキシ樹脂である場合は、ＥＬ素子１０,２０に
素子破壊が生じると、エポキシ樹脂を介して破壊が伝
播,拡大して断線が生じる等の問題がある。また、上記
透明絶縁物質３２が液体のシリコンオイルの場合は、ガ
ラス基板１１,２１等の反りのため、２つのＥＬ素子１
０,２０を所定間隙に保つのが難しく、両ＥＬ素子の透
明電極１４,２４が接触して短絡する虞れがある。この
虞れは、特にＥＬパネルが大面積になった場合に大き
く、製品の信頼性の面で問題となる。However, in the above-described conventional multicolor display EL panel, the gap between the first and second EL elements 10 and 20 sealed with the spacer 31 is filled with the transparent insulating material 32. Therefore, when the transparent insulating material is a solid epoxy resin, if the EL elements 10 and 20 are destroyed, the propagation of the destruction via the epoxy resin and enlargement may cause a problem such as disconnection. There is. When the transparent insulating material 32 is liquid silicon oil, the two EL elements 1
It is difficult to keep 0,20 at a predetermined gap, and there is a possibility that the transparent electrodes 14,24 of both EL elements come into contact with each other to cause a short circuit. This fear is particularly large when the EL panel has a large area, and poses a problem in terms of product reliability.
【０００５】そこで、本発明の目的は、対向する２つの
薄膜ＥＬ素子間の間隙の構成を工夫することによって、
素子破壊に起因する断線および電極の短絡を防止して、
信頼性を高めることができる多色表示ＥＬパネルおよび
その製造方法を提供することにある。Therefore, an object of the present invention is to devise a configuration of a gap between two opposed thin film EL elements,
Prevents disconnection and short-circuit of electrodes caused by element destruction,
An object of the present invention is to provide a multicolor display EL panel that can improve reliability and a method for manufacturing the same.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明は、第１の発光色を呈する薄膜ＥＬ
素子を形成した第１の透光性絶縁基板と、第２の発光色
を呈する薄膜ＥＬ素子を形成した第２の透光性絶縁基板
と、上記第１および第２の透光性絶縁基板の各薄膜ＥＬ
素子を互いに所定間隙をあけて対向させ、かつ上記所定
間隙を気密に封止する手段を有する多色表示ＥＬパネル
において、上記気密に封止された所定間隙に、各薄膜Ｅ
Ｌ素子に接しないように介装された絶縁性シートと、こ
の絶縁性シートの周囲の上記所定間隙に充填された絶縁
性オイルを備えたことを特徴とする。In order to achieve the above object, a first aspect of the present invention is to provide a thin film EL having a first emission color.
A first light-transmitting insulating substrate on which an element is formed, a second light-transmitting insulating substrate on which a thin-film EL element exhibiting a second emission color is formed, and the first and second light-transmitting insulating substrates. Each thin film EL
In a multicolor display EL panel having means for opposing elements with a predetermined gap therebetween and hermetically sealing the predetermined gap, each thin film E is provided in the hermetically sealed predetermined gap.
An insulating sheet interposed so as not to be in contact with the L element, and an insulating oil filled in the predetermined gap around the insulating sheet is provided.
【０００７】請求項１の多色表示ＥＬパネルは、封止手
段で気密に保たれた第１,第２の透光性絶縁基板の対向
する一対の薄膜ＥＬ素子の間の所定間隙に、絶縁性シー
トが接触しないように介装され、その周囲に絶縁性オイ
ルが充填されている。したがって、２枚の透光性絶縁基
板に反りが生じても、一対の薄膜ＥＬ素子の電極は、固
体の上記絶縁性シートによって互いに接触することなく
絶縁され、絶縁性オイルのみを充填していた従来例にお
ける短絡は生じなくなる。また、絶縁性シートは、薄膜
ＥＬ素子に接触していないので、素子破壊が生じてもこ
れが伝播,拡大せず、断線も生じないうえ、絶縁性オイ
ルが従来例と同様に薄膜ＥＬ素子を防湿する。According to a first aspect of the present invention, there is provided a multi-color display EL panel, wherein an insulating film is provided in a predetermined gap between a pair of opposed thin-film EL elements of the first and second translucent insulating substrates which are kept airtight by sealing means. The conductive sheet is interposed so as not to contact, and the surroundings are filled with insulating oil. Therefore, even if the two translucent insulating substrates are warped, the electrodes of the pair of thin-film EL elements are insulated without being in contact with each other by the solid insulating sheet, and are filled only with the insulating oil. The short circuit in the conventional example does not occur. Also, since the insulating sheet is not in contact with the thin-film EL element, even if the element is broken, it does not propagate and spread, does not break, and the insulating oil prevents the thin-film EL element from moisture as in the conventional example. I do.
【０００８】請求項２の多色表示ＥＬパネルは、上記絶
縁性シートの表面に、突起が設けられていることを特徴
とする。従って、このＥＬパネルは、透光性絶縁基板の
反り等で絶縁性シートと薄膜ＥＬ素子が接触しても、両
者は、突起を介して接触して、大面積で接触せず、それ
故、大面積接触による破壊の伝播,拡大および断線を防
ぐことができる。According to a second aspect of the present invention, there is provided the multicolor display EL panel, wherein a projection is provided on a surface of the insulating sheet. Therefore, in this EL panel, even if the insulating sheet and the thin film EL element come into contact with each other due to warpage of the light-transmitting insulating substrate, the two come into contact with each other via the projection and do not come into contact with each other over a large area. It can prevent the propagation, spread and disconnection of fracture due to large area contact.
【０００９】請求項３の多色表示ＥＬパネルは、上記絶
縁性シートおよび絶縁性オイルの屈折率が、同じである
ことを特徴とする。仮に、絶縁性シートと絶縁性オイル
の屈折率が異なると、請求項２のように絶縁性シートの
表面に突起がある場合、この突起によって絶縁性シート
が白濁して見え、光の透過率が低下する。しかし、上記
両者の屈折率が同じなので、突起における光の散乱が抑
えられて、両薄膜ＥＬ素子から発せられる光は、ＥＬパ
ネルの表面へ良好に透過して、明るい表示画面が得られ
る。The multicolor display EL panel according to a third aspect is characterized in that the insulating sheet and the insulating oil have the same refractive index. If the insulating sheet and the insulating oil have different refractive indices, if the insulating sheet has projections as in claim 2, the insulating sheet will appear cloudy due to the projections, and the light transmittance will be reduced. descend. However, since the two have the same refractive index, the scattering of light at the projections is suppressed, and the light emitted from both thin-film EL elements is transmitted well to the surface of the EL panel, and a bright display screen is obtained.
【００１０】請求項２の多色表示ＥＬパネルを製造する
という目的を達成するため、請求項４の発明は、上記絶
縁性シートの突起を、この絶縁性シートの表裏面に、擦
り傷を付けて設けることを特徴とする。つまり、例えば
合成樹脂等からなる絶縁性シートの表面の突起は、例え
ば紙やすり等の研磨材で表面をラビングして作られる凹
凸であるから、容易に作ることができるという利点があ
る。[0010] In order to achieve the object of manufacturing the multicolor display EL panel of the second aspect, the invention of the fourth aspect is characterized in that the projections of the insulating sheet are scratched on the front and back surfaces of the insulating sheet. It is characterized by being provided. That is, for example, the protrusions on the surface of the insulating sheet made of a synthetic resin or the like are irregularities formed by rubbing the surface with an abrasive such as sandpaper, and thus have an advantage that they can be easily formed.
【００１１】請求項５の発明は、請求項２に記載の多色
表示ＥＬパネルの製造方法であって、上記絶縁性シート
の突起を、この絶縁性シートの表裏面に、微小粒体を散
布した後、圧縮で付着させて設けることを特徴とする。
つまり、絶縁性シートの表面の突起は、例えば合成樹脂
等からなる絶縁性シートの表面に形成された例えば直径
５μm程度の球状ガラスなどの微小粒体からなるので、
均質で精度が良く、それ故、光の透過率が向上して均一
で一層高い輝度の表示画面が得られる。According to a fifth aspect of the present invention, there is provided the method of manufacturing a multicolor display EL panel according to the second aspect, wherein the projections of the insulating sheet are sprayed on the front and back surfaces of the insulating sheet with fine particles. After that, it is provided by being attached by compression.
That is, since the protrusions on the surface of the insulating sheet are made of fine particles such as spherical glass having a diameter of about 5 μm formed on the surface of the insulating sheet made of, for example, synthetic resin,
It is uniform and accurate, and therefore, the transmittance of light is improved, and a display screen with uniform and higher luminance can be obtained.
【００１２】[0012]
【発明の実施の形態】以下、本発明を図示の実施の形態
により詳細に説明する。図１は、本発明の多色表示ＥＬ
パネルの一例を示す断面図であり、このＥＬパネルは、
スペーサ３１で封止された対向する薄膜ＥＬ素子１,２
間の間隙の構成が異なる点を除いて図４で述べたＥＬパ
ネルと同じ構成であり、同じ部材には同一番号を付して
説明を省略する。上記ＥＬパネルは、第１の発光色であ
る黄橙色を呈する薄膜ＥＬ素子を形成した第１の透光性
絶縁基板１と、第２の発光色である青色を呈する薄膜Ｅ
Ｌ素子を形成した第２の透光性絶縁基板２と、例えば厚
さ10〜200μmのＰＥＴ(ポリエチレンテレフタレート)等
をエポキシ樹脂で接着したスペーサ３１で気密に保たれ
た両透光性絶縁基板１,２の対向する一対の薄膜ＥＬ素
子の間の所定間隙に、接触しないように介装された絶縁
性シート６と、その周囲に充填された絶縁性オイルとし
てのシリコンオイル８で構成される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows a multicolor display EL according to the present invention.
FIG. 2 is a cross-sectional view illustrating an example of a panel.
Opposing thin-film EL elements 1 and 2 sealed by spacers 31
The configuration is the same as that of the EL panel described in FIG. 4 except that the configuration of the gap between them is different, and the same members are denoted by the same reference numerals and description thereof will be omitted. The EL panel includes a first light-transmitting insulating substrate 1 on which a thin-film EL element exhibiting a yellow-orange color, which is a first emission color, and a thin film E exhibiting a second emission color, a blue color.
A second translucent insulating substrate 2 on which an L element is formed, and a double translucent insulating substrate 1 hermetically sealed by a spacer 31 made of, for example, a 10-200 μm thick PET (polyethylene terephthalate) or the like bonded with an epoxy resin , 2 and a predetermined gap between a pair of opposed thin film EL elements, an insulating sheet 6 interposed so as not to contact, and a silicone oil 8 as an insulating oil filled around the insulating sheet 6.
【００１３】ガラスからなる上記第１の透光性絶縁基板
１１上には、順次、ＩＴＯ等の透明電極１２、両側を絶
縁膜４で覆われたＺnＳ:Ｍnからなる発光層３、ＩＴＯ
等の透明電極１４が積層形成される。また、ガラスから
なる上記第２の透光性絶縁基板２１上には、順次、不透
明な金属電極２２、両側を絶縁膜４で覆われたＳrＳ:Ｃ
eからなる発光層５、ＩＴＯ等の透明電極２４が積層形
成される。上記絶縁膜４は、ＳiＯ2,Ｓi3Ｎ4,Ａl2Ｏ3等
を高周波スパッタ法などにより200〜300nm程度の厚さに
単層または多層で形成してなる。また、上記発光層３,
５は、電子ビーム蒸着法により700〜1300nmの厚さに形
成してなる。On the first translucent insulating substrate 11 made of glass, a transparent electrode 12 of ITO or the like, a light emitting layer 3 of ZnS: Mn covered on both sides with an insulating film 4, and an ITO
And the like are laminated. An opaque metal electrode 22 and SrS: C coated on both sides with an insulating film 4 are sequentially formed on the second light-transmitting insulating substrate 21 made of glass.
The light emitting layer 5 made of e and a transparent electrode 24 such as ITO are laminated. The insulating film4, SiO 2, Si 3 N 4 , made by forming a single layer or multi-layer of Al2 O3 or the like to a thickness of about 200~300nm by high-frequency sputtering method. In addition, the light emitting layer 3,
5 is formed to a thickness of 700 to 1300 nm by an electron beam evaporation method.
【００１４】上記絶縁性シート６は、ＰＥＴ等の高分子
膜,ガラス,樹脂膜などからなり、表裏面には後述する製
法により直径数μmの微小粒体からなる多数の突起７が
設けられるとともに、スペーサ３１を接着する前に、対
向する一対の透明電極１４,２４の間に接触しないよう
に全面に亘って介装される。なお、絶縁性シート６の厚
さは、透明電極１４,２４との接触を防ぐべく、スペー
サ３１の厚さよりも５μm以上薄くしている。絶縁性シ
ート６の周囲に充填されたシリコンオイル８は、上記突
起７の存在に拘わらず表面側の透光性絶縁基板１１への
光の透過率を向上させるべく、絶縁性シート６の屈折率
と同じ屈折率を有する。例えば、絶縁性シート６に屈折
率が1.54のガラス板を用いた場合、シリコンオイル８
は、東レ・ダウコーニング・シリコーン社製のSH550(屈
折率:1.496)とSH704(屈折率:1.558)を、２９：７１で混
合して、屈折率を1.54に調整している。The insulating sheet 6 is made of a polymer film such as PET, glass, resin film, etc., and is provided with a large number of projections 7 made of fine particles having a diameter of several μm on the front and rear surfaces by a manufacturing method described later. Before bonding the spacer 31, the spacer 31 is interposed over the entire surface so as not to contact between the pair of opposing transparent electrodes 14 and 24. Note that the thickness of the insulating sheet 6 is set to be 5 μm or more smaller than the thickness of the spacer 31 in order to prevent contact with the transparent electrodes 14 and 24. The silicone oil 8 filled around the insulating sheet 6 has a refractive index of the insulating sheet 6 to improve the transmittance of light to the light-transmitting insulating substrate 11 on the front surface irrespective of the presence of the protrusions 7. Has the same refractive index as For example, when a glass plate having a refractive index of 1.54 is used for the insulating sheet 6, silicone oil 8
Adjusts the refractive index to 1.54 by mixing SH550 (refractive index: 1.496) and SH704 (refractive index: 1.558) manufactured by Dow Corning Toray Silicone at a ratio of 29:71.
【００１５】図３は、上記絶縁性シート６の製造方法の
一例を示しており、この製造方法は、ＰＥＴフィルムか
らなる絶縁性シート６の表裏面に、直径５μm程度のガ
ラス製の多数の球状粒体７を散布した後、この絶縁性シ
ート６を両側から板状治具Ｐで挟んで矢印Ｆの如く圧縮
して、球状粒体７を絶縁性シート６に食い込ませて固着
させるものである。この製造方法によれば、粒径が一定
の多数の粒体７を均質かつ正確に絶縁性シート６の表裏
面に固着させることができるので、多数の粒体７によっ
て絶縁性シート６と透明電極１４,２４との万一の全面
接触が防止されるとともに、上述のシリコンオイル８の
屈折率の調整と相俟って、表面側の透光性絶縁基板１１
への光の透過率と均一性が向上して、一層均一で高い輝
度の表示画面が得られる。FIG. 3 shows an example of a method of manufacturing the insulating sheet 6. This manufacturing method is based on a method in which a large number of glass spheres having a diameter of about 5 μm are provided on the front and back surfaces of the insulating sheet 6 made of a PET film. After the granules 7 are sprayed, the insulating sheet 6 is sandwiched between the plate-like jigs P from both sides and compressed as shown by an arrow F, so that the spherical particles 7 bite into the insulating sheet 6 and are fixed. . According to this manufacturing method, a large number of particles 7 having a constant particle diameter can be uniformly and accurately fixed to the front and back surfaces of the insulating sheet 6. The entire surface of the transparent insulating substrate 11 on the front side is not only prevented from being brought into contact with the entire surface of the light-transmitting insulating substrate 11 together with the adjustment of the refractive index of the silicone oil 8 described above.
Thus, the transmittance and uniformity of light to the display screen are improved, and a display screen with higher uniformity and higher luminance can be obtained.
【００１６】図２は、他の製造方法で作られた絶縁性シ
ート６の一例を示す断面図である。この絶縁性シート６
は、ＰＥＴフィルムからなる絶縁性シート６の表裏面
を、例えば紙やすりのような研磨材を用いてラビングし
て、深さdが数μmの擦り傷９を付けたものである。この
製造方法によれば、ラビングで容易に凹凸の突起９を作
ることができ、この突起９によって絶縁性シート６と透
明電極１４,２４との万一の全面接触が防止され、上述
のシリコンオイル８の屈折率の調整と相俟って、表面側
の透光性絶縁基板１１への光の透過率が向上して、高い
輝度の表示画面が得られる。FIG. 2 is a sectional view showing an example of the insulating sheet 6 manufactured by another manufacturing method. This insulating sheet 6
Is obtained by rubbing the front and back surfaces of an insulating sheet 6 made of a PET film using, for example, an abrasive such as sandpaper, and applying a scratch 9 having a depth d of several μm. According to this manufacturing method, the uneven projections 9 can be easily formed by rubbing, and the entire surfaces of the insulating sheet 6 and the transparent electrodes 14 and 24 are prevented by the projections 9. Together with the adjustment of the refractive index of 8, the transmittance of light to the light-transmitting insulating substrate 11 on the front surface side is improved, and a display screen with high luminance can be obtained.
【００１７】上記構成の多色表示ＥＬパネルは、次のよ
うに作用する。多色表示ＥＬパネルは、図１に示すよう
に、スペーサ３１で気密に保たれた第１,第２の透光性
絶縁基板１１,２１の対向する一対の透明電極１４,２４
の間の間隙に、表裏面に小径粒状のガラス製の多数の突
起７をもつ絶縁性シート６が接触しないように介装さ
れ、その周囲に絶縁性シート６と同じ屈折率をもつシリ
コンオイル８が充填されている。従って、２枚の透光性
絶縁基板１,２に多少の反りが生じても、一対の透明電
極１４,２４は、固体の絶縁性シート６によって接触す
ることなく絶縁され、絶縁性オイルのみを充填していた
従来例(図４参照)におけるような短絡は生じない。ま
た、絶縁性シート６は、固体のエポキシ樹脂のみを充填
していた従来例と異なり、一対の透明電極１４,２４に
直接接していないので、ＥＬ素子の破壊が生じてもこれ
が伝播,拡大せず、断線も生じないうえ、シリコンオイ
ル８がＥＬ素子を防湿する。The multi-color display EL panel having the above structure operates as follows. As shown in FIG. 1, the multicolor display EL panel includes a pair of opposed transparent electrodes 14 and 24 of first and second translucent insulating substrates 11 and 21 which are kept airtight by a spacer 31.
An insulating sheet 6 having a large number of small-diameter granular glass projections 7 on its front and back surfaces is interposed so as not to come into contact with the gap therebetween, and a silicone oil 8 having the same refractive index as the insulating sheet 6 is provided around the insulating sheet 6. Is filled. Therefore, even if the two translucent insulating substrates 1 and 2 are slightly warped, the pair of transparent electrodes 14 and 24 are insulated without contact by the solid insulating sheet 6 and only the insulating oil is removed. Short-circuiting does not occur as in the conventional example (see FIG. 4) that has been filled. Further, unlike the conventional example in which only the solid epoxy resin is filled, the insulating sheet 6 is not in direct contact with the pair of transparent electrodes 14 and 24. No disconnection occurs, and the silicon oil 8 prevents the EL element from moisture.
【００１８】一方、透光性絶縁基板１,２が相当反っ
て、絶縁性シート６と透明電極１４,２４が接触して
も、両者は、多数の小径粒状ガラスからなる突起７を介
して接触するだけで、全面に亘って接触しないので、両
者の大面積接触によるＥＬ素子破壊の伝播,拡大および
断線が防止される。さらに、絶縁性シート６とシリコン
オイル８の屈折率が同一なので、そうでない場合に、上
記突起９による表示面側への光の透過率の低下に起因し
て生じる表示画面の白濁が無くなる。つまり、同一の屈
折率により突起９での光の散乱が抑えられて、第１の発
光層３からの黄橙色,第２の発光層５からの青色の発光
は、ＥＬパネルの表面側の透光性絶縁基板１１へ良好に
透過して、明るい表示画面が得られるのである。なお、
本発明の発光層の材料は、上記実施の形態のＺnＳ:Ｍn
(黄橙色発光)およびＳrＳ:Ｃe(青色発光)に限られない
のは言うまでもない。On the other hand, even if the light-transmitting insulating substrates 1 and 2 are considerably warped and the insulating sheet 6 and the transparent electrodes 14 and 24 come into contact with each other, they come into contact with each other via a large number of projections 7 made of small-diameter granular glass. However, since the contact does not occur over the entire surface, propagation, enlargement, and disconnection of EL element destruction due to large-area contact between the two are prevented. Furthermore, since the refractive index of the insulating sheet 6 and that of the silicon oil 8 are the same, otherwise, the opacity of the display screen caused by the decrease in the transmittance of light toward the display surface due to the protrusions 9 is eliminated. That is, scattering of light at the protrusions 9 is suppressed by the same refractive index, and yellow-orange light from the first light-emitting layer 3 and blue light from the second light-emitting layer 5 are transmitted through the surface of the EL panel. The light is transmitted well to the optical insulating substrate 11 and a bright display screen is obtained. In addition,
The material of the light emitting layer of the present invention is ZnS: Mn of the above embodiment.
(Yellow-orange light emission) and SrS: Ce (blue light emission).
【００１９】[0019]
【発明の効果】以上の説明で明らかなように、請求項１
の多色表示ＥＬパネルは、封止手段で気密に保たれた第
１,第２の透光性絶縁基板の対向する一対の薄膜ＥＬ素
子の間の所定間隙に、絶縁性シートが接触しないように
介装され、その周囲に絶縁性オイルが充填されているの
で、一対の薄膜ＥＬ素子の電極の接触を絶縁性シートで
防ぎ、これら電極と絶縁性シートとを絶縁性オイルで隔
てて、透光性絶縁基板に反りが生じても、両電極の短絡
を防止でき、ＥＬ素子破壊の伝播,拡大および断線を防
止することができ、製品の信頼性を高めることができ
る。As is apparent from the above description, claim 1
In the multicolor display EL panel, the insulating sheet does not come into contact with a predetermined gap between the pair of opposed thin film EL elements of the first and second translucent insulating substrates which are kept airtight by the sealing means. Since the insulating oil is filled around the electrodes, the electrodes of the pair of thin-film EL elements are prevented from contacting with the insulating sheet, and these electrodes and the insulating sheet are separated by the insulating oil to be transparent. Even if the optical insulating substrate is warped, a short circuit between both electrodes can be prevented, propagation, expansion and disconnection of EL element destruction can be prevented, and the reliability of the product can be improved.
【００２０】請求項２の多色表示ＥＬパネルは、上記絶
縁性シートの表面に、突起が設けられているので、透光
性絶縁基板の反りなどで絶縁性シートと薄膜ＥＬ素子が
接触しても、突起を介する接触で両者の大面積接触が防
がれ、破壊の伝播,拡大および断線を防止することがで
き、製品の信頼性を高めることができる。また、請求項
３の多色表示ＥＬパネルは、上記絶縁性シートおよび絶
縁性オイルの屈折率を同じにしているので、上記突起に
おける光の散乱が抑えられて、両薄膜ＥＬ素子から発せ
られる光が、ＥＬパネルの表面へ良好に透過して、明る
い表示画面を得ることができ、製品の信頼性を高めるこ
とができる。In the multicolor display EL panel according to the second aspect of the present invention, since the projections are provided on the surface of the insulating sheet, the insulating sheet and the thin film EL element come into contact with each other due to warpage of the translucent insulating substrate. In addition, the contact through the protrusion prevents large-area contact between the two, preventing the propagation, enlargement, and disconnection of breakage, and improving the reliability of the product. Further, in the multicolor display EL panel according to the third aspect, since the refractive index of the insulating sheet and the refractive index of the insulating oil are the same, the scattering of light at the projections is suppressed, and the light emitted from both thin film EL elements is reduced. However, the light can be transmitted well to the surface of the EL panel to obtain a bright display screen, and the reliability of the product can be improved.
【００２１】請求項４の多色表示ＥＬパネルの製造方法
は、上記絶縁性シートの突起を、この絶縁性シートの表
裏面に擦り傷を付けて設けているので、薄膜ＥＬ素子と
の大面積接触を防ぎうる絶縁性シートを容易に作ること
ができる。In the method of manufacturing a multicolor display EL panel according to the present invention, since the protrusions of the insulating sheet are provided with scratches on the front and back surfaces of the insulating sheet, a large area contact with the thin film EL element is provided. It is possible to easily produce an insulating sheet capable of preventing the occurrence of the sheet.
【００２２】請求項５の多色表示ＥＬパネルの製造方法
は、上記絶縁性シートの突起を、この絶縁性シートの表
裏面に、微小粒体を散布した後、圧縮で付着させて設け
ているので、薄膜ＥＬ素子との大面積接触を防ぎつつ、
光の透過率を向上させて均一で一層高い輝度の表示画面
を実現しうる絶縁性シートを作ることができる。According to a fifth aspect of the present invention, in the method of manufacturing a multicolor display EL panel, the projections of the insulating sheet are provided by spraying fine particles on the front and back surfaces of the insulating sheet and then adhering them by compression. Therefore, while preventing large area contact with the thin film EL element,
An insulating sheet capable of improving the light transmittance and realizing a display screen with uniform and higher luminance can be manufactured.
【図１】 本発明の多色表示ＥＬパネルの一例を示す断
面図である。FIG. 1 is a cross-sectional view illustrating an example of a multicolor display EL panel of the present invention.
【図２】 他の製造方法で作られた絶縁性シートの一例
を示す断面図である。FIG. 2 is a cross-sectional view showing an example of an insulating sheet made by another manufacturing method.
【図３】 図１の絶縁性シートの製造方法の一例を示す
断面図である。FIG. 3 is a sectional view showing an example of a method for manufacturing the insulating sheet of FIG.
【図４】 従来の多色表示ＥＬパネルを示す断面図であ
る。FIG. 4 is a cross-sectional view showing a conventional multicolor display EL panel.
１…第１の薄膜ＥＬ素子、２…第２の薄膜ＥＬ素子、３
…発光層(ＺnＳ:Ｍn)、４…絶縁膜、５…発光層(ＳrＳ:
Ｃe)、６…絶縁性シート、７…突起、８…シリコンオイ
ル、９…突起、１１…第１の透光性絶縁基板、２１…第
２の透光性絶縁基板、１２,１４,２４…透明電極、２２
…金属電極、３１…スペーサ。DESCRIPTION OF SYMBOLS 1 ... 1st thin film EL element 2 ... 2nd thin film EL element, 3
... Light-emitting layer (ZnS: Mn), 4 ... insulating film, 5 ... Light-emitting layer (SrS:
Ce), 6: insulating sheet, 7: protrusion, 8: silicon oil, 9: protrusion, 11: first light-transmitting insulating substrate, 21: second light-transmitting insulating substrate, 12, 14, 24 ... Transparent electrode, 22
... metal electrodes, 31 ... spacers.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8240371AJPH1092569A (en) | 1996-09-11 | 1996-09-11 | Multicolor display EL panel and manufacturing method thereof |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8240371AJPH1092569A (en) | 1996-09-11 | 1996-09-11 | Multicolor display EL panel and manufacturing method thereof |
| Publication Number | Publication Date |
|---|---|
| JPH1092569Atrue JPH1092569A (en) | 1998-04-10 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8240371APendingJPH1092569A (en) | 1996-09-11 | 1996-09-11 | Multicolor display EL panel and manufacturing method thereof |
| Country | Link |
|---|---|
| JP (1) | JPH1092569A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8847316B2 (en) | 1999-03-02 | 2014-09-30 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and method of manufacturing the same |
| WO2016031130A1 (en)* | 2014-08-26 | 2016-03-03 | パナソニックＩｐマネジメント株式会社 | Organic electroluminescent element |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8847316B2 (en) | 1999-03-02 | 2014-09-30 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and method of manufacturing the same |
| US9153604B2 (en) | 1999-03-02 | 2015-10-06 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and method of manufacturing the same |
| WO2016031130A1 (en)* | 2014-08-26 | 2016-03-03 | パナソニックＩｐマネジメント株式会社 | Organic electroluminescent element |
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