WO2010010611A1 - Display device using transparent light-emitting panel - Google Patents
Display device using transparent light-emitting panel Download PDFInfo
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- WO2010010611A1 WO2010010611A1 PCT/JP2008/063162 JP2008063162W WO2010010611A1 WO 2010010611 A1 WO2010010611 A1 WO 2010010611A1 JP 2008063162 W JP2008063162 W JP 2008063162W WO 2010010611 A1 WO2010010611 A1 WO 2010010611A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- 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
- H10K2102/3031—Two-side emission, e.g. transparent OLEDs [TOLED]
Definitions
- the present invention uses a transparent self-luminous panel that includes a transparent self-luminous panel, and can display a display by the transparent self-luminous panel and a display by a display unit disposed on the back side of the self-luminous panel. Related to the display device.
- a transparent electrode, a light emitting layer, and the other electrode are provided in this order on a transparent substrate, and a sealing member for preventing moisture from entering from above is provided.
- a bottom emission type display panel that emits light from the substrate side has been proposed.
- a transparent electrode, a light emitting layer, and another transparent electrode are sequentially provided on a transparent substrate, sealed with a transparent sealing member, and light is emitted from both the transparent substrate side and the transparent sealing member side.
- a dual emission (double-sided light emission) type display panel has also been proposed.
- a dual emission type display panel that is transparent in a non-light-emitting state is sometimes called a transparent organic EL (TOLED) panel.
- TOLED transparent organic EL
- the light (luminance) emitted from both sides is usually not equal. This is because the TOLED panel uses different materials for both electrodes sandwiching the light emitting layer due to its light emission principle, and the structure of the light emitting element is not symmetrical when viewed from the light emitting layer.
- the light emitting layer is not a single layer but is generally composed of a plurality of layers such as a hole transport layer, an organic light emitting layer, and an electron transport layer made of different materials.
- the luminance on both sides is increased by providing a layer for adjusting the reflectance between the transparent substrate and the electrode or between the transparent sealing member and the electrode. It would be common to employ an equal structure.
- TOLED is used instead of a photo frame cover glass or watch cover glass, and in the usage mode in which the display by this TOLED is observed only from one direction, the observation by the ease of recognition of the display by TOLED is observed. It is thought that it is common to install it with the surface with high brightness facing the user.
- the form of observing both the display by the TOLED and the observation object arranged on the back side of the TOLED from one direction is repeatedly studied.
- the luminance distribution on the front and back sides of the TOLED was considered.
- the configuration in which the surface with low emission brightness of the TOLED is set toward the observer side rather than the surface with high emission luminance of the TOLED is set toward the viewer side, it is arranged on the back side of the TOLED.
- the inventor has experimentally found that the observed object can be observed more clearly.
- the display device which has been made to solve the above-described problems, is formed of the first electrode made of a light-transmitting material and the light-transmitting material as described in claim 1.
- a first display unit by a transparent self-luminous panel comprising a second electrode, a light emitting layer formed between the electrode 1 and the electrode 2, and a second display unit provided on the back side of the first display unit,
- FIG. 1 schematically shows a basic configuration of a display device according to the present invention.
- An observer P is provided on a first display unit by a transparent self-luminous panel indicated by reference numeral 1 and on the back side of the first display unit.
- the display by the second display unit indicated by reference numeral 2 provided is observed simultaneously. That is, the observer P sees the display 1i by the second display unit through the first display unit at the same time as viewing the display 1i by the first display unit.
- FIG. 2 is a schematic diagram mainly illustrating the configuration of the first display unit using the transparent self-luminous panel described above, and shows an example of a transparent organic EL (TOLED) panel using an organic EL element as the self-luminous element.
- the laminated structure of the TOLED panel 1 has a transparent anode electrode 4 made of, for example, ITO formed in a stripe shape on one surface of a transparent substrate 3 made of, for example, glass.
- a light emitting layer 5 is further laminated on the transparent anode electrode 4.
- the light emitting layer 5 is composed of a plurality of layers such as a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer.
- a transparent cathode electrode (counter electrode) 6 made of, for example, an Al and Ca layer is laminated on the light emitting layer 5.
- the transparent cathode electrode 6 is also formed in a stripe shape, and is configured to intersect (orthogonally) the transparent anode electrode 4 formed in a stripe shape. Thereby, the light emitting layer 5 sandwiched between the transparent anode electrode 4 and the transparent cathode electrode 6 constitutes a passive matrix display panel that constitutes a pixel.
- a refractive index adjustment layer 7 made of, for example, Alq3 is formed on the transparent cathode electrode 6 described above, and a transparent sealing member 8 made of a glass substrate is formed on the refractive index adjustment layer 7 to form a TOLED panel. Is formed. That is, in this embodiment, the refractive index adjusting layer 7 is disposed on the surface side of the first display unit 1 relative to the light emitting layer 5. And the 2nd display part 2 is arrange
- the symbol a schematically shows direct light emitted from the light emitting layer 5 to the transparent cathode electrode 6 side, and the symbol a2 passes through the sealing member 8 to transmit the TOLED panel.
- the direct light emitted to the surface side is typically shown.
- Reference symbol b schematically represents direct light emitted from the light emitting layer 5 to the transparent anode electrode 4 side, and reference symbol b2 represents direct light transmitted through the transparent substrate 3 and emitted to the back side of the TOLED panel. This is shown schematically.
- a part of the direct light emitted to the transparent cathode electrode 6 side indicated by the symbol a is reflected by the transparent cathode electrode 6 and the refractive index adjusting layer 7, and this reflection component is transmitted through the transparent substrate 3 to form the TOLED panel. Released to the back side.
- This reflected light is shown as a3.
- a part of the direct light emitted to the transparent anode electrode 4 side indicated by the symbol b is reflected by the transparent anode electrode 4, and this reflected component is transmitted through the transparent sealing member 8 and emitted to the surface side of the TOLED panel. Is done. This reflected light is shown as b3.
- the refractive index adjustment layer 7 in the TOLED panel having the above-described configuration reflects a part of the direct light a emitted to the transparent cathode electrode 6 side as reflected light a3 on the back side of the TOLED panel by changing the thickness thereof. The degree can be controlled.
- the film thickness of the refractive index adjustment layer 7 can be controlled at about ⁇ 5 nm, so the luminance ratio C is maintained at 0.47 or more. Is possible.
- the inventor has found that the brightness ratio C is 0.43 or less, a difference occurs in the observation state of the display 2i of the second display unit 2, and the difference is clear when the brightness ratio C is 0.4 or less. . That is, it was confirmed that when the luminance ratio C was 0.4 or less, the display 2i of the second display unit 2 through the TOLED panel could be clearly observed.
- the luminance ratio C is considered to be within a practical range where 0.3 ⁇ C ⁇ 0.4. Can do.
- the refractive index adjustment layer is provided in order to grasp the relationship between the luminance ratio and the visibility of the observation object, but this refractive index adjustment layer is not always necessary.
- the glass substrate is used for each of the transparent substrate and the transparent sealing member.
- the present invention is not particularly limited to this, and other transparent materials can be used.
- a gap is provided between the first display unit and the second display unit, but the first display unit and the second display unit may be in contact with each other, and the second display unit A display panel such as an organic EL element or a liquid crystal display can also be used.
Abstract
A display device is composed of a first display part (1) composed of a first electrode (4) formed of an optically transparent material, a second electrode (6) formed of an optically transparent material and a light emitting layer (5) formed between the first electrode and the second electrode, and a second display part (2) provided on the rear surface side of the first display part. From the front surface side of the first display part, a display by the first display part and that by the second display part through the first display part are observed simultaneously. The light emitting luminance (A) of the front surface side (the side of an observer (P)) is set to be smaller than the light emitting luminance (B) of the rear surface side generated by the light-emitting layer (5) of the first display part (1). This makes it possible to clearly observe the display (2i) by the second display part through the first display part.
Description
この発明は、透明な自発光パネルを備え、この透明な自発光パネルによる表示と、当該自発光パネルを介してその裏側に配置された表示部による表示も見ることができる透明自発光パネルを使用した表示装置に関する。
The present invention uses a transparent self-luminous panel that includes a transparent self-luminous panel, and can display a display by the transparent self-luminous panel and a display by a display unit disposed on the back side of the self-luminous panel. Related to the display device.
例えば携帯型の情報機器の普及によって、高精細な表示機能を有し、薄型かつ低消費電力化を実現できる表示パネルの需要が増大しており、自発光型素子であるという特質を生かした有機ＥＬ（エレクトロ・ルミネッセンス）素子を用いた表示パネルが実用化されている。
For example, with the spread of portable information devices, there is an increasing demand for display panels that have high-definition display functions, can be thin, and can achieve low power consumption. Display panels using EL (electroluminescence) elements have been put into practical use.
前記した有機ＥＬ素子を用いた表示パネルには、透明基板上に透明電極と発光層ともう一方の電極を順に設け、この上から水分の進入を阻止するための封止部材を設け、前記透明基板側から光を放出するボトムエミッションタイプの表示パネルが提案されている。また、基板上に電極、発光層、透明電極を順に設け、透明な封止部材により封止を施し、前記透明な封止部材側から光を放出するトップエミッションタイプの表示パネルも提案されている。
In the display panel using the organic EL element described above, a transparent electrode, a light emitting layer, and the other electrode are provided in this order on a transparent substrate, and a sealing member for preventing moisture from entering from above is provided. A bottom emission type display panel that emits light from the substrate side has been proposed. There has also been proposed a top emission type display panel in which an electrode, a light emitting layer, and a transparent electrode are sequentially provided on a substrate, sealed with a transparent sealing member, and light is emitted from the transparent sealing member side. .
このほか、透明基板上に透明電極と発光層ともう一方の透明電極を順に設け、透明な封止部材により封止を施し、透明基板側と透明な封止部材側の両面から光を放出するデュアルエミッション（両面発光）タイプの表示パネルも提案されている。非発光状態において透明のデュアルエミッションタイプの表示パネルを、特に透明有機ＥＬ（ＴＯＬＥＤ）パネルと呼ぶこともある。
In addition, a transparent electrode, a light emitting layer, and another transparent electrode are sequentially provided on a transparent substrate, sealed with a transparent sealing member, and light is emitted from both the transparent substrate side and the transparent sealing member side. A dual emission (double-sided light emission) type display panel has also been proposed. A dual emission type display panel that is transparent in a non-light-emitting state is sometimes called a transparent organic EL (TOLED) panel.
前記したＴＯＬＥＤパネルは通常においては、両面から放出される光（輝度）は等しくはならない。これはＴＯＬＥＤパネルはその発光原理より、発光層を挟む両電極には異なる材料が使用され、発光素子の構造が発光層から見て対称でないことに起因している。
In the above-described TOLED panel, the light (luminance) emitted from both sides is usually not equal. This is because the TOLED panel uses different materials for both electrodes sandwiching the light emitting layer due to its light emission principle, and the structure of the light emitting element is not symmetrical when viewed from the light emitting layer.
一般的には、陽極電極にはキャリアである正孔を効率的に注入するために仕事関数が大きな材料を使用し、陰極材料にはキャリアである電子を効率的に注入するために仕事関数が小さな材料を使用する。また、発光層も単層ではなく、異なる材料からなる正孔輸送層、有機発光層、電子輸送層などの複数の層から構成されることがほとんどである。
Generally, a material having a large work function is used for the anode electrode in order to efficiently inject holes serving as carriers, and a work function is used for the cathode material in order to efficiently inject electrons serving as carriers. Use small materials. In addition, the light emitting layer is not a single layer but is generally composed of a plurality of layers such as a hole transport layer, an organic light emitting layer, and an electron transport layer made of different materials.
このため、各層の透過率の違いや、各層の屈折率の違いによる各層間の反射率の違い等により、発光層で均等に光が発生しても一方の透明基板と他方の透明封止部材から放出される光の量には違いが生じる。
For this reason, even if light is evenly generated in the light emitting layer due to a difference in transmittance of each layer or a difference in reflectance between layers due to a difference in refractive index of each layer, one transparent substrate and the other transparent sealing member There is a difference in the amount of light emitted from the.
ところで、前記したＴＯＬＥＤパネルを利用する例としては、例えばゲーム機などでＴＯＬＥＤを挟んで２名のゲームプレイヤーが対峙し、ＴＯＬＥＤの両面からそれぞれ画像を観察するような使用形態が考えられる。
By the way, as an example of using the above-mentioned TOLED panel, for example, there can be considered a usage mode in which two game players face each other with the TOLED sandwiched by a game machine or the like and images are observed from both sides of the TOLED.
また、例えば写真立てにおけるカバーガラスの代わりに、前記ＴＯＬＥＤを使用し、ＴＯＬＥＤによる表示とＴＯＬＥＤの裏側に近接配置された写真などの観察物の両方を観察する使用形態が考えられる。さらに同様に、腕時計のカバーガラスの代わりにＴＯＬＥＤを搭載し、ＴＯＬＥＤによる表示とその裏側の時計表示の両方を観察する使用形態も考えられる。このように腕時計にＴＯＬＥＤを組み合わせた構成は、次に示す特許文献１に開示されている。
特開２００２－２５８７７４号公報
Further, for example, instead of the cover glass in a photo stand, the above-mentioned TOLED is used, and a usage form in which both the display by the TOLED and the observation object such as a photograph arranged close to the back side of the TOLED can be considered. Furthermore, similarly, a use form in which TOLED is mounted instead of the cover glass of a wristwatch and both the display by TOLED and the clock display on the back side thereof are observed is also conceivable. A configuration in which TOLED is combined with a wristwatch in this manner is disclosed in Patent Document 1 shown below.
JP 2002-258774 A
ところで、前記したようにＴＯＬＥＤを両側から観察する使用方法の場合には、透明基板と電極間、又は透明封止部材と電極間に反射率調整用の層を設けるなどして、両側の輝度を等しくする構造を採用するのが一般的であろうと考えられる。また、前記したように写真立てのカバーガラスや時計のカバーガラスの代わりにＴＯＬＥＤを用い、このＴＯＬＥＤによる表示を一方向からのみ観察する使用形態においては、ＴＯＬＥＤによる表示の認識のしやすさから観察者側に輝度が大きい面を向けて設置するのが一般的であろうと考えられる。
By the way, in the case of the usage method in which the TOLED is observed from both sides as described above, the luminance on both sides is increased by providing a layer for adjusting the reflectance between the transparent substrate and the electrode or between the transparent sealing member and the electrode. It would be common to employ an equal structure. In addition, as described above, TOLED is used instead of a photo frame cover glass or watch cover glass, and in the usage mode in which the display by this TOLED is observed only from one direction, the observation by the ease of recognition of the display by TOLED is observed. It is thought that it is common to install it with the surface with high brightness facing the user.
この発明は、前記した後者のように、ＴＯＬＥＤによる表示とＴＯＬＥＤの裏側に配置された観察物の両方を一方向から観察する形態について検討を重ね、ＴＯＬＥＤの裏側に配置された観察物をＴＯＬＥＤを介してより鮮明に観察することができる表示装置を提供することを課題として、ＴＯＬＥＤの表裏の輝度配分について考察した。
In the present invention, as in the latter case described above, the form of observing both the display by the TOLED and the observation object arranged on the back side of the TOLED from one direction is repeatedly studied. In order to provide a display device that can be observed more clearly through the above, the luminance distribution on the front and back sides of the TOLED was considered.
その結果、ＴＯＬＥＤの発光輝度の高い面を観察者側に向けて設置するよりも、むしろＴＯＬＥＤの発光輝度の低い面を観察者側に向けて設置した構成にすると、ＴＯＬＥＤの裏面側に配置される観察物がより鮮明に観察できることを発明者は実験的に見い出した。
As a result, if the configuration in which the surface with low emission brightness of the TOLED is set toward the observer side rather than the surface with high emission luminance of the TOLED is set toward the viewer side, it is arranged on the back side of the TOLED. The inventor has experimentally found that the observed object can be observed more clearly.
したがって、前記した課題を解決するためになされたこの発明にかかる表示装置は、請求項１に記載のとおり、光透過性の素材により形成された第１電極、光透過性の素材により形成された第２電極、前記電極１と前記電極２の間に形成された発光層とからなる透明自発光パネルによる第１表示部と、前記第１表示部の裏面側に設けられた第２表示部とから構成され、前記第１表示部の表面側より、当該第１表示部による表示と前記第２表示部による表示とを同時に観察する表示装置であって、前記第１表示部の発光層による裏面側の発光輝度に比べて、表面側の発光輝度が小さく設定されている点に特徴を有する。
Therefore, the display device according to the present invention, which has been made to solve the above-described problems, is formed of the first electrode made of a light-transmitting material and the light-transmitting material as described in claim 1. A first display unit by a transparent self-luminous panel comprising a second electrode, a light emitting layer formed between the electrode 1 and the electrode 2, and a second display unit provided on the back side of the first display unit, A display device for simultaneously observing the display by the first display unit and the display by the second display unit from the front surface side of the first display unit, wherein the back surface by the light emitting layer of the first display unit It is characterized in that the light emission luminance on the surface side is set smaller than the light emission luminance on the side.
１ 第１表示部（ＴＯＬＥＤパネル）
１ｉ 第１表示部による表示
２ 第２表示部
２ｉ 第２表示部による表示
３ 透明基板
４ 透明陽極電極
５ 発光層
６ 透明陰極電極
７ 屈折率調整層
８ 透明封止部材
Ｐ 観察者 1 First display (TOLED panel)
DESCRIPTION OF SYMBOLS 1i Display by1st display part 2 2nd display part 2i Display by 2nd display part 3 Transparent substrate 4 Transparent anode electrode 5 Light emitting layer 6 Transparent cathode electrode 7 Refractive index adjustment layer 8 Transparent sealing member P Observer
１ｉ 第１表示部による表示
２ 第２表示部
２ｉ 第２表示部による表示
３ 透明基板
４ 透明陽極電極
５ 発光層
６ 透明陰極電極
７ 屈折率調整層
８ 透明封止部材
Ｐ 観察者 1 First display (TOLED panel)
DESCRIPTION OF SYMBOLS 1i Display by
以下、この発明にかかる表示装置について、図に示す実施の形態に基づいて説明する。図１はこの発明にかかる表示装置の基本構成を模式的に示したものであり、観察者Ｐは符号１で示す透明自発光パネルによる第１表示部と、この第１表示部の裏面側に設けられた符号２で示す第２表示部による表示を同時に観察するようになされる。すなわち、観察者Ｐは第１表示部による表示１ｉを見ると同時に、第１表示部を透過して第２表示部による表示２ｉも見ることになる。
Hereinafter, a display device according to the present invention will be described based on an embodiment shown in the drawings. FIG. 1 schematically shows a basic configuration of a display device according to the present invention. An observer P is provided on a first display unit by a transparent self-luminous panel indicated by reference numeral 1 and on the back side of the first display unit. The display by the second display unit indicated by reference numeral 2 provided is observed simultaneously. That is, the observer P sees the display 1i by the second display unit through the first display unit at the same time as viewing the display 1i by the first display unit.
図２は前記した透明自発光パネルによる第１表示部の構成を主に説明する模式図であり、有機ＥＬ素子を自発光素子として用いた透明有機ＥＬ（ＴＯＬＥＤ）パネルの例を示している。このＴＯＬＥＤパネル１の積層構造を図２に模式的に示すように例えばガラス製の透明基板３の一面には、例えばＩＴＯからなる透明陽極電極４がストライプ状に形成されている。
FIG. 2 is a schematic diagram mainly illustrating the configuration of the first display unit using the transparent self-luminous panel described above, and shows an example of a transparent organic EL (TOLED) panel using an organic EL element as the self-luminous element. As schematically shown in FIG. 2, the laminated structure of the TOLED panel 1 has a transparent anode electrode 4 made of, for example, ITO formed in a stripe shape on one surface of a transparent substrate 3 made of, for example, glass.
前記透明陽極電極４上にはさらに発光層５が積層されている。この発光層５は、図には示していないが、例えば正孔輸送層、有機発光層、電子輸送層、電子注入層等の複数の層から構成される。そして発光層５上には例えばＡｌとＣａの層からなる透明陰極電極（対向電極）６が積層されている。
A light emitting layer 5 is further laminated on the transparent anode electrode 4. Although not shown in the drawing, the light emitting layer 5 is composed of a plurality of layers such as a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer. A transparent cathode electrode (counter electrode) 6 made of, for example, an Al and Ca layer is laminated on the light emitting layer 5.
前記透明陰極電極６もストライプ状になされ、ストライプ状に形成された前記透明陽極電極４と交差（直交）するように構成されている。これにより透明陽極電極４と透明陰極電極６との交差位置に挟まれた発光層５がそれぞれ画素を構成するパッシブマトリクス型表示パネルを構成している。
The transparent cathode electrode 6 is also formed in a stripe shape, and is configured to intersect (orthogonally) the transparent anode electrode 4 formed in a stripe shape. Thereby, the light emitting layer 5 sandwiched between the transparent anode electrode 4 and the transparent cathode electrode 6 constitutes a passive matrix display panel that constitutes a pixel.
また、前記した透明陰極電極６上には、例えばＡｌｑ3 からなる屈折率調整層７が形成され、この屈折率調整層７上にはガラス基板からなる透明封止部材８が形成されて、ＴＯＬＥＤパネルが形成されている。すなわち、この実施の形態においては第１表示部１における発光層５よりも表面側に、前記した屈折率調整層７が配置されている。そして、透明基板３側（第１表示部の裏面側）には第２表示部２が配置され、前記したとおり観察者Ｐは、第１表示部１による表示１ｉを見ると同時に、第１表示部を透過して第２表示部による表示２ｉも見ることになる。
Further, a refractive index adjustment layer 7 made of, for example, Alq3 is formed on the transparent cathode electrode 6 described above, and a transparent sealing member 8 made of a glass substrate is formed on the refractive index adjustment layer 7 to form a TOLED panel. Is formed. That is, in this embodiment, the refractive index adjusting layer 7 is disposed on the surface side of the first display unit 1 relative to the light emitting layer 5. And the 2nd display part 2 is arrange | positioned at the transparent substrate 3 side (the back side of a 1st display part), and as above-mentioned, the observer P sees the display 1i by the 1st display part 1, and is the 1st display. The display 2i by the second display section is also seen through the section.
図２に示したＴＯＬＥＤパネルにおいて、符号ａは前記した発光層５より透明陰極電極６側に放出される直接光を模式的に示し、また符号ａ２は封止部材８を透過してＴＯＬＥＤパネルの表面側に放出される直接光を模式的に示している。また符号ｂは前記した発光層５より透明陽極電極４側に放出される直接光を模式的に示し、また符号ｂ２は透明基板３を透過してＴＯＬＥＤパネルの裏面側に放出される直接光を模式的に示している。
In the TOLED panel shown in FIG. 2, the symbol a schematically shows direct light emitted from the light emitting layer 5 to the transparent cathode electrode 6 side, and the symbol a2 passes through the sealing member 8 to transmit the TOLED panel. The direct light emitted to the surface side is typically shown. Reference symbol b schematically represents direct light emitted from the light emitting layer 5 to the transparent anode electrode 4 side, and reference symbol b2 represents direct light transmitted through the transparent substrate 3 and emitted to the back side of the TOLED panel. This is shown schematically.
さらに、符号ａで示す透明陰極電極６側に放出される直接光の一部は、透明陰極電極６および屈折率調整層７において反射され、この反射成分が透明基板３を透過してＴＯＬＥＤパネルの裏面側に放出される。この反射光をａ３として示している。同様に符号ｂで示す透明陽極電極４側に放出される直接光の一部は、透明陽極電極４において反射され、この反射成分が透明封止部材８を透過してＴＯＬＥＤパネルの表面側に放出される。この反射光をｂ３として示している。
Further, a part of the direct light emitted to the transparent cathode electrode 6 side indicated by the symbol a is reflected by the transparent cathode electrode 6 and the refractive index adjusting layer 7, and this reflection component is transmitted through the transparent substrate 3 to form the TOLED panel. Released to the back side. This reflected light is shown as a3. Similarly, a part of the direct light emitted to the transparent anode electrode 4 side indicated by the symbol b is reflected by the transparent anode electrode 4, and this reflected component is transmitted through the transparent sealing member 8 and emitted to the surface side of the TOLED panel. Is done. This reflected light is shown as b3.
前記した構成のＴＯＬＥＤパネルにおける屈折率調整層７は、その厚さを変えることにより、透明陰極電極６側に放出される直接光ａの一部をＴＯＬＥＤパネルの裏面側に反射光ａ３として反射させる度合いを制御することができる。
The refractive index adjustment layer 7 in the TOLED panel having the above-described configuration reflects a part of the direct light a emitted to the transparent cathode electrode 6 side as reflected light a3 on the back side of the TOLED panel by changing the thickness thereof. The degree can be controlled.
そこで、前記した構成のＴＯＬＥＤパネルにおいて、屈折率調整層７の厚さを変えた場合の透明基板３側（第１表示部の裏面側）から放出される輝度Ｂおよび透明封止部材８側（第１表示部の表面側）から放出される輝度Ａ（輝度Ａ，Ｂはそれぞれ単位面積当たりの光量）の関係を図３に示している。また図３に示す関係から、屈折率調整層７の厚さを変えた場合の透明封止部材８側の輝度率Ｃ〔Ｃ＝Ａ／（Ａ＋Ｂ）〕を図４に示している。
Therefore, in the TOLED panel having the above-described configuration, the luminance B emitted from the transparent substrate 3 side (the back side of the first display unit) and the transparent sealing member 8 side (when the thickness of the refractive index adjustment layer 7 is changed) FIG. 3 shows the relationship between the luminance A emitted from the surface of the first display unit (the luminances A and B are the amounts of light per unit area, respectively). Further, from the relationship shown in FIG. 3, the luminance factor C [C = A / (A + B)] on the transparent sealing member 8 side when the thickness of the refractive index adjusting layer 7 is changed is shown in FIG.
前記した輝度Ａと輝度Ｂが等しいパネルを作成しようとした場合、屈折率調整層７の膜厚を±５ｎｍ程度で制御することが可能なため、輝度比Ｃを０．４７以上に維持することが可能である。発明者は前記輝度比Ｃが０．４３以下で、第２表示部２の表示２ｉの観察状態に違いが生じ、輝度比Ｃが０．４以下で、その違いが明瞭になることを見出した。すなわち、前記輝度比Ｃが０．４以下としたとき、ＴＯＬＥＤパネルを通した第２表示部２の表示２ｉが明瞭に観察できることが確かめられた。
When an attempt is made to create a panel having the same luminance A and luminance B, the film thickness of the refractive index adjustment layer 7 can be controlled at about ± 5 nm, so the luminance ratio C is maintained at 0.47 or more. Is possible. The inventor has found that the brightness ratio C is 0.43 or less, a difference occurs in the observation state of the display 2i of the second display unit 2, and the difference is clear when the brightness ratio C is 0.4 or less. . That is, it was confirmed that when the luminance ratio C was 0.4 or less, the display 2i of the second display unit 2 through the TOLED panel could be clearly observed.
一方、第１表示部１を構成するＴＯＬＥＤパネルへの投入電力を一定とし、輝度比Ｃを小さくすると、第１表示部の輝度Ａが低下し第１表示部における表示１ｉの観察状態が悪化する。このため、第１表示部の観察状態を維持するため、輝度Ａを一定に保つためには、ＴＯＬＥＤパネルへの投入電力を増やす必要が生じる。その結果、輝度比Ｃを小さくする程、表示装置の消費電力が増加することになる。
On the other hand, when the input power to the TOLED panel constituting the first display unit 1 is made constant and the luminance ratio C is made small, the luminance A of the first display unit decreases and the observation state of the display 1i on the first display unit deteriorates. . For this reason, in order to maintain the observation state of the first display unit, it is necessary to increase the input power to the TOLED panel in order to keep the luminance A constant. As a result, the power consumption of the display device increases as the luminance ratio C decreases.
以上の理由により、第２表示部２の表示２ｉの観察状態と消費電力の増加を勘案すると、前記輝度比Ｃは０．３≦Ｃ≦０．４が実用上において、好適な範囲と考えることができる。
For the above reasons, considering the observation state of the display 2i of the second display unit 2 and the increase in power consumption, the luminance ratio C is considered to be within a practical range where 0.3 ≦ C ≦ 0.4. Can do.
なお、前記した実施の形態においては、輝度比と観察物の見やすさの関係を把握するために屈折率調整層を設けているが、この屈折率調整層が必ずしも必要ではない。また、実施の形態においては、透明基板と透明封止部材にそれぞれガラス基板を使用したが、特にこれに限定されるものではなく他の透明な素材を用いることもできる。
In the above-described embodiment, the refractive index adjustment layer is provided in order to grasp the relationship between the luminance ratio and the visibility of the observation object, but this refractive index adjustment layer is not always necessary. In the embodiment, the glass substrate is used for each of the transparent substrate and the transparent sealing member. However, the present invention is not particularly limited to this, and other transparent materials can be used.
さらに前記した実施の形態においては第１表示部と第２表示部との間に隙間が設けられているが、第１表示部と第２表示部は接していても良く、また第２表示部は有機ＥＬ素子や液晶表示体などの表示パネルを使用することもできる。
Further, in the above-described embodiment, a gap is provided between the first display unit and the second display unit, but the first display unit and the second display unit may be in contact with each other, and the second display unit A display panel such as an organic EL element or a liquid crystal display can also be used.
Claims (3)
- 光透過性の素材により形成された第１電極、光透過性の素材により形成された第２電極、前記電極１と前記電極２の間に形成された発光層とからなる透明自発光パネルによる第１表示部と、前記第１表示部の裏面側に設けられた第２表示部とから構成され、前記第１表示部の表面側より、当該第１表示部による表示と前記第２表示部による表示とを同時に観察する表示装置であって、
前記第１表示部の発光層による裏面側の発光輝度に比べて、表面側の発光輝度が小さく設定されていることを特徴とする表示装置。 A transparent self-luminous panel comprising a first electrode formed of a light-transmitting material, a second electrode formed of a light-transmitting material, and a light-emitting layer formed between the electrode 1 and the electrode 2 1 display part and the 2nd display part provided in the back surface side of the 1st display part, from the surface side of the 1st display part, the display by the 1st display part and the 2nd display part A display device for simultaneously observing the display,
The display device is characterized in that the light emission luminance on the front surface side is set smaller than the light emission luminance on the back surface side of the light emitting layer of the first display section. - 前記第１表示部の表面側の発光輝度Ａと裏面側の発光輝度Ｂの関係が、０．３０≦Ａ／（Ａ＋Ｂ）≦０．４の範囲に設定されていることを特徴とする請求項１に記載された表示装置。 The relationship between the light emission luminance A on the front surface side and the light emission luminance B on the back surface side of the first display unit is set in a range of 0.30 ≦ A / (A + B) ≦ 0.4. 1. The display device described in 1.
- 前記第１表示部における発光層よりも表面側に屈折率調整層が配置されていることを特徴とする請求項１または請求項２に記載された表示装置。 The display device according to claim 1, wherein a refractive index adjustment layer is disposed on a surface side of the light emitting layer in the first display unit.
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| PCT/JP2008/063162 WO2010010611A1 (en) | 2008-07-23 | 2008-07-23 | Display device using transparent light-emitting panel |
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