JP2001357973A - Display device - Google Patents
Display deviceInfo
- Publication number
- JP2001357973A JP2001357973A JP2000179285A JP2000179285A JP2001357973A JP 2001357973 A JP2001357973 A JP 2001357973A JP 2000179285 A JP2000179285 A JP 2000179285A JP 2000179285 A JP2000179285 A JP 2000179285A JP 2001357973 A JP2001357973 A JP 2001357973A
- Authority
- JP
- Japan
- Prior art keywords
- display
- display device
- layer
- moisture absorption
- absorption layer
- 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.)
- Abandoned
Links
- 238000010521 absorption reaction Methods 0.000 claims abstract description 53
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000005401 electroluminescence Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 230000006866 deterioration Effects 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 abstract 3
- 239000010410 layer Substances 0.000 description 65
- 239000011521 glass Substances 0.000 description 9
- 239000002250 absorbent Substances 0.000 description 8
- 230000002745 absorbent Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000012044 organic layer Substances 0.000 description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 6
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 5
- 229910052581 Si3N4 Inorganic materials 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000005525 hole transport Effects 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000001505 atmospheric-pressure chemical vapour deposition Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003230 hygroscopic agent Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000012780 transparent material Substances 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
-
- 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
- H10K59/874—Passivation; Containers; Encapsulations including getter material or desiccant
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/302—Details of OLEDs of OLED structures
- H10K2102/3023—Direction of light emission
- H10K2102/3026—Top emission
Landscapes
- Electroluminescent Light Sources (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は表示装置に関し、特
には上面発光型の有機エレクトロルミネッセンスディス
プレイに好適な表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a display device suitable for a top emission type organic electroluminescent display.
【０００２】[0002]
【従来の技術】有機材料のエレクトロルミネッセンス(e
lectroluminescence：以下ＥＬと記す）を利用した有機
ＥＬ素子は、陽極と陰極との間に有機正孔輸送層や有機
発光層を積層させた有機層を設けてなり、低電圧直流駆
動による高輝度発光が可能な発光素子として注目されて
いる。ところが、有機ＥＬ素子を用いた表示装置（すな
わち有機ＥＬディスプレイ）は、吸湿によって有機ＥＬ
素子の有機層の劣化が生じ、各有機ＥＬ素子における発
光輝度が低下したり、発光が不安定になる等、経時的な
安定性が低くかつ寿命が短いと言った課題がある。2. Description of the Related Art Electroluminescence (e) of organic materials
An organic EL device using electroluminescence (hereinafter referred to as EL) has an organic layer in which an organic hole transport layer and an organic light emitting layer are laminated between an anode and a cathode, and emits high-luminance light by low-voltage DC driving. Is attracting attention as a light-emitting element that can emit light. However, a display device using an organic EL element (that is, an organic EL display) uses an organic EL element due to moisture absorption.
There is a problem that the organic layer of the element is deteriorated, the emission luminance of each organic EL element is reduced, the light emission becomes unstable, and the stability over time is short and the life is short.
【０００３】そこで、このような表示装置においては、
図４の断面図に示すように、基板１上に有機ＥＬ素子を
配列形成してなる画素エリア２に、封止キャップ３を被
せて内部にドライエアを封入し、さらに封止キャップ３
の内壁に吸水剤４を貼り付けることで、有機ＥＬ素子へ
の水分の到達を防止している。[0003] In such a display device,
As shown in the sectional view of FIG. 4, a sealing cap 3 is placed over a pixel area 2 in which organic EL elements are arranged and formed on a substrate 1, and dry air is sealed therein.
By adhering the water absorbing agent 4 to the inner wall of the device, it is possible to prevent moisture from reaching the organic EL element.
【０００４】[0004]
【発明が解決しようとする課題】ところが、図４に示し
たような封止キャップ３を被せた構成の表示装置におい
ては、封止キャップ３の内壁面に吸水剤４を貼り付けて
いる。このため、基板１側から表示光ｈを取り出す透過
型の表示装置には適用できるものの、基板１と反対側の
封止キャップ側３から表示光ｈを取り出す上面発光型の
表示装置に適用しようとした場合、吸水剤４によって表
示光ｈの放出が妨げられる。したがって、封止キャップ
３を設けた構成は、上面発光型の表示装置として適する
ものではなかった。However, in a display device having a structure in which the sealing cap 3 is covered as shown in FIG. 4, the water absorbing agent 4 is attached to the inner wall surface of the sealing cap 3. Therefore, the present invention can be applied to a transmission type display device that extracts display light h from the substrate 1 side, but is applied to a top emission type display device that extracts display light h from the sealing cap side 3 opposite to the substrate 1. In this case, the emission of the display light h is prevented by the water absorbing agent 4. Therefore, the configuration provided with the sealing cap 3 was not suitable for a top-emission type display device.
【０００５】[0005]
【課題を解決するための手段】本発明は上記のような課
題に鑑みて成されたものであり、基板上に設けられた表
示素子と、当該表示素子を覆う封止膜とを備えた表示装
置において、この封止膜が、第１低吸湿層とその上層に
設けられた第２低吸湿層との間に、これらの層を構成す
る材料よりも吸湿性の高い材料を挟んでなる多層構造で
あることを特徴としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in view of the above, and provides a display device having a display element provided on a substrate and a sealing film covering the display element. In the apparatus, the sealing film is a multilayer structure in which a material having a higher hygroscopic property than a material forming these layers is interposed between the first low moisture absorbing layer and the second low moisture absorbing layer provided thereon. It is characterized by a structure.
【０００６】このような構成の表示装置では、封止膜
が、第１低吸湿層と第２低吸湿層との間に吸湿性の高い
材料を挟んだ構成になっているため、第２低吸湿層を通
過した水分はこの層の下方の吸湿性の高い材料に捕捉さ
れる。しかも、この材料と表示素子との間に設けられた
第１低吸湿層によって、この材料に捕捉された水分の表
示素子側への放出が防止される。したがって、封止膜に
取り込まれた水分が、表示素子に到達することを防止で
きる。In the display device having such a configuration, the sealing film has a structure in which a material having high hygroscopicity is sandwiched between the first low moisture absorbing layer and the second low moisture absorbing layer. Moisture that has passed through the moisture absorbing layer is captured by a highly hygroscopic material below this layer. In addition, the first low moisture absorption layer provided between the material and the display element prevents the water trapped in the material from being released to the display element side. Therefore, it is possible to prevent the moisture taken in the sealing film from reaching the display element.
【０００７】[0007]
【発明の実施の形態】以下、本発明における表示装置の
実施の形態を、図面に基づいて説明する。図１は、実施
形態を説明するための表示装置の要部拡大断面図であ
り、図２はこの表示装置の全体構成を説明するための平
面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the display device according to the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a main part of a display device for describing an embodiment, and FIG. 2 is a plan view for explaining the entire configuration of the display device.
【０００８】これらの図に示す表示装置は、例えばガラ
ス基板やその他の材料からなる基板１１の一主面１１a
側の表示エリア１２（図２のみに図示）に、複数の表示
素子１３を配列形成してなり、この表示素子１３を覆う
状態で封止膜１５が成膜されている。また、封止膜１５
上には樹脂１７（図１のみに図示）によってガラス基板
１９が貼り付けられ、このガラス基板１９と基板１１と
の間に表示素子１３と封止膜１５とが挟持された構成に
なっている。The display device shown in these figures has a main surface 11a of a substrate 11 made of, for example, a glass substrate or another material.
A plurality of display elements 13 are arranged and formed in a display area 12 (shown only in FIG. 2) on the side, and a sealing film 15 is formed so as to cover the display elements 13. Also, the sealing film 15
A glass substrate 19 is adhered on the top with a resin 17 (shown only in FIG. 1), and the display element 13 and the sealing film 15 are sandwiched between the glass substrate 19 and the substrate 11. .
【０００９】ここで、この表示装置が基板１１側から表
示光を取り出す透過型である場合には、基板１１にはガ
ラス基板のような透明基板が用いられる。一方、この表
示装置が基板１１と対するガラス基板１９側から表示光
ｈを取り出す上面発光型である場合には、基板１１の材
質はこれに限定されることはない。尚、以降において
は、この表示素子を上面発光型として説明を行う。Here, when the display device is of a transmission type in which display light is extracted from the substrate 11 side, a transparent substrate such as a glass substrate is used as the substrate 11. On the other hand, when the display device is a top emission type in which display light h is extracted from the glass substrate 19 side with respect to the substrate 11, the material of the substrate 11 is not limited to this. In the description below, this display element will be described as a top emission type.
【００１０】表示素子１３は、例えば有機ＥＬ素子から
なるもので、基板１１上の表示エリア１４（図２のみに
図示）内にマトリックス状に配列形成されている。The display elements 13 are made of, for example, organic EL elements, and are arranged in a matrix in a display area 14 (shown only in FIG. 2) on the substrate 11.
【００１１】尚、ここでの図示は省略したが、有機ＥＬ
素子は、基板１１側から順に下部電極、有機層、及び上
部電極を積層してなるもので、ここでは特に上部電極が
透明材料で構成されていることとする。下部電極及び上
部電極は、何れか一方が有機層に対して電子を注入する
陰極となり、他方が有機層に対して正孔を注入する陽極
となるもので、それぞれに適した材料によって構成され
ることとする。また、有機層は、少なくとも有機発光層
を備え、必要に応じて有機正孔輸送層や有機電子輸送層
等と共にこの有機発光層を所定順序で積層させた構成で
あることとする。さらに、ここでの図示は省略したが、
この下部電極と上部電極とによって、走査線やデータ線
が構成され、任意の位置に配置された有機ＥＬ素子の有
機発光層を発光させるように構成されている。Although illustration is omitted here, the organic EL
The element is formed by laminating a lower electrode, an organic layer, and an upper electrode in this order from the substrate 11 side. Here, it is assumed that the upper electrode is particularly formed of a transparent material. One of the lower electrode and the upper electrode serves as a cathode for injecting electrons into the organic layer, and the other serves as an anode for injecting holes into the organic layer, and is formed of a material suitable for each. It shall be. The organic layer includes at least an organic light emitting layer, and has a configuration in which the organic light emitting layer is laminated in a predetermined order together with an organic hole transport layer, an organic electron transport layer, and the like as necessary. Furthermore, although illustration is omitted here,
A scanning line and a data line are formed by the lower electrode and the upper electrode, and the organic light emitting layer of the organic EL element arranged at an arbitrary position emits light.
【００１２】そして、封止膜１５は、これらの表示素子
１３が設けられた画素エリア１２を覆う状態で、基板１
１上に成膜されたもので、第１低吸湿層１５ａとこの上
層の第２低吸湿層１５ｂとの間に、これらの層を構成す
る材料よりも吸湿性の高い材料からなる高吸湿層１５ｃ
を挟んだ構成になっている。第１低吸湿層１５ａ及び第
２低吸湿層１５ｂは、この表示装置の製造プロセスが許
容する範囲の材料で、できるだけ吸湿性が低い材料を用
いて構成されることとし、ここでは特に表示素子１３か
ら放出される表示光ｈが透過する材料を用いることとす
る。同様に、高吸湿層１５ｃは、この表示装置の製造プ
ロセスが許容する範囲の材料で、できるだけ吸湿性が高
い材料を用いて構成されることとし、ここでは特に表示
素子から放出される表示光を透過する材料を用いること
とする。The sealing film 15 covers the pixel area 12 on which the display elements 13 are provided.
1, a high moisture absorption layer made of a material having a higher moisture absorption than the material constituting these layers, between the first low moisture absorption layer 15a and the second lower moisture absorption layer 15b as an upper layer. 15c
Is sandwiched between them. The first low moisture absorption layer 15a and the second low moisture absorption layer 15b are made of a material having a hygroscopicity as low as possible within a range permitted by the manufacturing process of the display device. A material through which the display light h emitted from is transmitted. Similarly, the high moisture-absorbing layer 15c is made of a material within the range allowed by the manufacturing process of the display device, and is made of a material having a high hygroscopicity as much as possible. A material that transmits light is used.
【００１３】具体的な一例としては、第１低吸湿層１５
ａ及び第２低吸湿層１５ｂとして窒化シリコン膜を用
い、高吸湿層１５ｃとして酸化シリコン膜を用いること
とする。これらの材料膜は、成膜方法によっても異なる
含有水分量を示すが、一般的には酸化シリコン膜のほう
が、窒化シリコン膜よりも含有水分率が高い、すなわち
吸水性が高いと言った特性を備えている。As a specific example, the first low moisture absorption layer 15
Here, a silicon nitride film is used as a and the second low moisture absorption layer 15b, and a silicon oxide film is used as the high moisture absorption layer 15c. These material films have different moisture contents depending on the film formation method, but in general, a silicon oxide film has a higher moisture content than a silicon nitride film, that is, has a property that water absorption is higher. Have.
【００１４】例えば、プラズマＣＶＤ(chemical vapor
deposition）法によって形成された窒化シリコン膜の含
有水分率が０．２４重量％であるのに対して、ＴＥＯＳ
（tetraethoxy silane）ガスを用いた常圧ＣＶＤ法によ
って形成された酸化シリコン膜の含有水分率は１．９０
重量％、ＴＥＯＳガスを用いたプラズマＣＶＤ法によっ
て形成された酸化シリコン膜の含水率は０．６０％と高
く、いずれも窒化シリコン膜よりも吸水性が高いことが
わかる。For example, plasma CVD (chemical vapor)
The silicon nitride film formed by the deposition method has a moisture content of 0.24% by weight, while TEOS
The moisture content of the silicon oxide film formed by the atmospheric pressure CVD method using (tetraethoxy silane) gas is 1.90.
The water content of the silicon oxide film formed by a plasma CVD method using a TEOS gas with a weight percentage of TEOS gas is as high as 0.60%, which indicates that the silicon oxide film has higher water absorption than the silicon nitride film.
【００１５】そこで、高吸湿層１５ｃとしては、より吸
水性の高い材料として、ＴＥＯＳ系常圧ＣＶＤ法によっ
て形成された酸化シリコン膜を用いることとする。Therefore, as the high moisture absorption layer 15c, a silicon oxide film formed by a TEOS normal pressure CVD method is used as a material having higher water absorption.
【００１６】また、このような材料からなる各層の膜厚
は、一例として下層から順に、第１低吸湿層１５ａが２
μｍ〜３μｍ、高吸湿層１５ｃが１μｍ程度、第２低吸
湿層１５ｂが１μｍ程度であることとする。The thickness of each layer made of such a material is, for example, in order from the lower layer, the first low moisture absorption layer 15a
μm to 3 μm, the high moisture absorption layer 15c is about 1 μm, and the second low moisture absorption layer 15b is about 1 μm.
【００１７】尚、高吸湿層１５ｃは、この表示装置の製
造プロセスが許容する範囲であれば、成膜後にベーキン
グなどの処置を施すことで含水率を低下させた有機系材
料膜であっても良い。また、第１低吸湿層１５ａ、第２
低吸湿層１５ｂ及び高吸湿層１５ｃは、それぞれ単層に
限定されることはなく、複数の層で構成された物であっ
ても良い。The high moisture absorption layer 15c may be an organic material film whose moisture content has been reduced by performing a treatment such as baking after film formation, as long as the manufacturing process of the display device is within the allowable range. good. Also, the first low moisture absorption layer 15a, the second
Each of the low moisture absorption layer 15b and the high moisture absorption layer 15c is not limited to a single layer, and may be composed of a plurality of layers.
【００１８】そして、このような多層構造の封止膜１５
上に、樹脂１７によってガラス基板１９が貼り付けられ
ている。このガラス基板１９は、紫外線硬化型の樹脂１
７を介して封止膜１５上に配置され、ガラス基板１９上
から紫外線を照射して樹脂１７を硬化させることによっ
て封止膜１５側に接着されている。The sealing film 15 having such a multilayer structure
A glass substrate 19 is adhered on the top with a resin 17. The glass substrate 19 is made of an ultraviolet-curable resin 1.
The glass substrate 19 is disposed on the sealing film 15 with the ultraviolet light 7 radiated from the glass substrate 19 to cure the resin 17.
【００１９】このように構成された表示装置において
は、表示素子１３を覆う封止膜が、第１低吸湿層１５ａ
と第２低吸湿層１５ｂとの間に高吸湿層１５ｃを挟んだ
構成になっているため、外部から浸入した大気中の水分
が第２低吸湿層１５ｂを通過し場合、この水分は第２低
吸湿層１５ｂ下の高吸湿層１５ｃに捕捉される。そし
て、この高吸湿層１５ｃと表示素子１３との間に設けら
れた第１低吸湿層１５ａによって、この高吸湿層１５ｃ
に捕捉された水分の表示素子１３側への放出が防止され
る。したがって、封止膜１５に取り込まれた水分が、表
示素子１３に到達することを防止できる。In the display device configured as described above, the sealing film covering the display element 13 is formed by the first low moisture absorption layer 15a.
Since the high moisture absorption layer 15c is sandwiched between the second moisture absorption layer 15b and the second moisture absorption layer 15b, when moisture in the air that has entered from the outside passes through the second low moisture absorption layer 15b, this moisture becomes the second moisture absorption layer. It is trapped in the high moisture absorption layer 15c below the low moisture absorption layer 15b. Then, the first low moisture absorption layer 15a provided between the high moisture absorption layer 15c and the display element 13 causes the high moisture absorption layer 15c.
Of the moisture trapped in the display element 13 is prevented. Therefore, it is possible to prevent the moisture taken in the sealing film 15 from reaching the display element 13.
【００２０】この結果、表示素子１３の吸湿による劣化
を防止することが可能になり、表示装置の表示特性の安
定化を図り、かつ寿命特性の向上を図ることが可能にな
る。しかも、この表示装置は、従来の技術で図４を用い
て説明したような画素エリアに封止キャップを被せた構
成ではなく、表示素子１３を封止膜１５で覆った構成で
あるため、上面発光型の表示装置としても適するものと
なる。As a result, it is possible to prevent the display element 13 from being deteriorated due to moisture absorption, to stabilize the display characteristics of the display device, and to improve the life characteristics. In addition, this display device has a configuration in which the pixel element is covered with the sealing film 15 instead of a configuration in which the pixel area is covered with the sealing cap as described with reference to FIG. It is also suitable as a light-emitting display device.
【００２１】上述の実施形態においては、上面発光型の
表示装置に本発明を適用した場合の構成を説明した。し
かし、本発明は、基板側から表示光を取り出す透過型の
表示装置にも適用可能であり、同様の効果を得ることが
できる。また、本実施形態においては、吸湿による劣化
が特に著しい有機ＥＬ素子を表示素子１３として用いた
表示装置を例に採って、本発明を説明した。しかし、本
発明は、有機ＥＬ素子を表示素子とした表示装置以外に
も広く適用可能であり、同様の効果を得ることが可能で
ある。In the above embodiment, the configuration in the case where the present invention is applied to the top emission type display device has been described. However, the present invention is also applicable to a transmissive display device that extracts display light from the substrate side, and similar effects can be obtained. Further, in the present embodiment, the present invention has been described by taking, as an example, a display device using, as the display element 13, an organic EL element whose deterioration due to moisture absorption is particularly remarkable. However, the present invention can be widely applied to a display device other than a display device using an organic EL element as a display element, and similar effects can be obtained.
【００２２】また、上述の実施形態においては、封止膜
１５の構成を第１低吸湿層１５ａと第２低吸湿層１５ｂ
との間に高吸湿層１５ｃを挟んだ多層構造で説明した。
しかし、本発明の表示装置は、このような構成の封止膜
を有するものに限定されることはなく、例えば図３に示
すような構成であっても良い。In the above embodiment, the structure of the sealing film 15 is the same as that of the first low moisture absorption layer 15a and the second low moisture absorption layer 15b.
And the multi-layer structure with the high moisture absorption layer 15c interposed therebetween.
However, the display device of the present invention is not limited to the one having the sealing film having such a configuration, and may have a configuration as shown in FIG. 3, for example.
【００２３】この図に示す表示装置の封止膜１５’は、
第１低吸湿層１５ａと第２低吸湿層１５ｂとの間に、こ
れらの層を構成する材料よりも吸湿性の高い材料を粒子
状にして挟み込んだ構成になっている。このような粒子
状吸湿剤１５ｄとしては、例えば酸化バリウム（Ｂａ
Ｏ）や酸化カルシウム（ＣａＯ）等を用いることができ
る。The sealing film 15 'of the display device shown in FIG.
Between the first low moisture absorption layer 15a and the second low moisture absorption layer 15b, a material having a higher hygroscopic property than the material constituting these layers is sandwiched in a particulate state. As such a particulate moisture absorbent 15d, for example, barium oxide (Ba)
O) and calcium oxide (CaO) can be used.
【００２４】この場合、粒子状吸湿剤１５ｄによって、
封止膜１５’の光透過性が損なわれない様に、その粒子
径及び第１低吸湿層１５ａと第２低吸湿層１５ｂとの間
における充填密量が設計されることとする。このような
粒子状吸湿剤１５ｄは、例えば、第１低吸湿剤１５ａを
形成した後に、抵抗加熱法等によって第１低吸湿剤１５
ａ上に蒸着させる。また、この粒子状吸湿剤１５ｄを覆
う第２低吸湿層１５ｂは、粒子状吸湿剤１５ｄによる凹
凸が完全に埋め込まれる程度の膜厚で形成されることと
する。In this case, the particulate moisture absorbent 15d
The particle size and the filling density between the first low moisture absorption layer 15a and the second low moisture absorption layer 15b are designed so that the light transmittance of the sealing film 15 'is not impaired. Such a particulate moisture absorbent 15d may be formed, for example, by forming the first low moisture absorbent 15a by a resistance heating method or the like after forming the first low moisture absorbent 15a.
a. Further, the second low moisture absorption layer 15b covering the particulate moisture absorbent 15d is formed to have a film thickness such that the unevenness due to the particulate moisture absorbent 15d is completely embedded.
【００２５】このような構成の封止膜１５’を有する表
示装置であっても、表示素子１３を覆う封止膜１５’が
第１低吸湿層１５ａと第２低吸湿層１５ｂとの間に吸湿
性の高い粒子状吸湿剤１５ｄを挟んだ構成になっている
ため、封止膜１５’に取り込まれた水分が、表示素子１
３に到達することを防止できる。このため、上述の実施
形態と同様に基板１１上の表示素子効果を得ることがで
きる。Even in a display device having the sealing film 15 'having such a structure, the sealing film 15' covering the display element 13 is provided between the first low moisture absorption layer 15a and the second low moisture absorption layer 15b. Because of the configuration in which the particulate hygroscopic agent 15d having a high hygroscopic property is sandwiched, the moisture taken in the sealing film 15 'is
3 can be prevented. Therefore, a display element effect on the substrate 11 can be obtained in the same manner as in the above-described embodiment.
【００２６】[0026]
【発明の効果】以上説明したように、本発明の表示装置
によれば、第１低吸湿層と第２低吸湿層との間に吸湿性
の高い材料を挟んだ構成の封止膜によって表示素子を覆
った構成を採用したことで、表示素子への水分の到達を
防止することができる。このため、水分吸収による表示
素子の劣化を防止し、経時的な表示安定性が良好でかつ
十分な寿命特性を備え、しかも上面発光型に適する構造
の表示装置を得ることが可能になる。As described above, according to the display device of the present invention, display is performed by the sealing film having a structure in which a material having high hygroscopicity is sandwiched between the first low moisture absorbing layer and the second low moisture absorbing layer. By adopting the structure covering the element, it is possible to prevent moisture from reaching the display element. For this reason, it is possible to prevent the display element from deteriorating due to moisture absorption, to obtain a display device having good display stability over time, sufficient life characteristics, and a structure suitable for a top emission type.
【図１】実施形態における表示装置の要部拡大断面図で
ある。FIG. 1 is an enlarged sectional view of a main part of a display device according to an embodiment.
【図２】実施形態における表示装置の平面図である。FIG. 2 is a plan view of the display device according to the embodiment.
【図３】実施形態の変形例を示す要部拡大断面図であ
る。FIG. 3 is an enlarged sectional view of a main part showing a modification of the embodiment.
【図４】従来の技術の一例を示す断図図である。FIG. 4 is a sectional view showing an example of a conventional technique.
１１…基板、１２…表示素子、１５，１５’…封止膜、
１５ａ…第１低吸湿層、１５ｂ…第２低吸湿層、１５ｃ
…高吸湿層、１５ｄ…粒子状吸湿剤、ｈ…表示光11: substrate, 12: display element, 15, 15 ': sealing film,
15a: first low moisture absorption layer, 15b: second low moisture absorption layer, 15c
... High moisture absorption layer, 15d ... Particle moisture absorbent, h ... Display light
Claims (4)
示素子を覆う封止膜とを備えた表示装置であって、 前記封止膜は、第１低吸湿層とその上層に設けられた第
２低吸湿層との間に、これらの層を構成する材料よりも
吸湿性の高い材料を挟んでなる多層構造であることを特
徴とする表示装置。1. A display device comprising: a display element provided on a substrate; and a sealing film covering the display element, wherein the sealing film is provided on a first low moisture absorption layer and an upper layer thereof. A display device having a multi-layer structure in which a material having a higher hygroscopic property than the material constituting these layers is interposed between the second low moisture absorption layer and the second low moisture absorption layer.
あることを特徴とする表示装置。2. The display device according to claim 1, wherein said display element is an organic electroluminescence element.
することを特徴とする表示装置。3. The display device according to claim 1, wherein the display element emits display light from a side facing the substrate.
過することを特徴とする表示装置。4. The display device according to claim 1, wherein the sealing film transmits display light emitted from the display element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000179285A JP2001357973A (en) | 2000-06-15 | 2000-06-15 | Display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000179285A JP2001357973A (en) | 2000-06-15 | 2000-06-15 | Display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001357973A true JP2001357973A (en) | 2001-12-26 |
| JP2001357973A5 JP2001357973A5 (en) | 2007-01-11 |
Family
ID=18680581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000179285A Abandoned JP2001357973A (en) | 2000-06-15 | 2000-06-15 | Display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001357973A (en) |
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