JP5879613B2 - 表示装置 - Google Patents
表示装置 Download PDFInfo
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- JP5879613B2 JP5879613B2 JP2012525322A JP2012525322A JP5879613B2 JP 5879613 B2 JP5879613 B2 JP 5879613B2 JP 2012525322 A JP2012525322 A JP 2012525322A JP 2012525322 A JP2012525322 A JP 2012525322A JP 5879613 B2 JP5879613 B2 JP 5879613B2
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Classifications
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- 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
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/08—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
-
- 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
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/876—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
-
- 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
- H10K2102/351—Thickness
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- 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
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
Description
本発明の一態様である発光素子は、反射電極と透明電極との間に、青色光を放射する発光層を有する発光素子であって、前記反射電極と前記発光層との間に機能層が介挿され、前記機能層の光学膜厚が、455.4[nm]以上475.8[nm]以下である。
2.本発明の実施の形態
以下、本発明の実施の形態について、図面を参照しながら説明する。
2.1.有機ELディスプレイの構成
図1は、本発明の一実施形態にかかる有機ELディスプレイの一部断面を模式的に示した断面図である。
2.2.色度重視及び効率重視の膜厚設計
上述の距離の調整に係る膜厚は、色度と、発光効率とを考慮して決定する。以下、色度を重視する設計を色度重視設計、発光効率を重視する設計を効率重視設計という。
2.3.実験及び膜厚設計
膜厚は、色度については、緑色発光素子では、色度xが0.29以下となるよう設計し、赤色発光素子では、色度yが0.33以下となるよう設計し、青色発光素子では、色度yが0.06以下となるよう設計する。
2.3.1.緑色発光素子
図5は、CF補正はせず、透明導電層4の膜厚を変化させたときの緑色発光素子の発光効率と色度xの変化を表す図である。
2.3.2.赤色発光素子
図7は、CF補正をせず、透明導電層4の膜厚を変化させたときの赤色発光素子の発光効率と色度yの変化を表す図である。
2.3.3.青色発光素子について
(1)設計手法の選択
図9は、透明導電層4の膜厚を変化させたときの青色発光素子の発光効率と色度yとを表す図である。
(2)色度重視設計
上述したように、青色発光素子では、発光効率がピーク値の80%以内、かつ色度yが0.06以下となる範囲(以下、青色膜厚条件という。)になるよう設計する。そして、色度重視設計でこの条件を満たす膜厚としては、図9を用いて説明したように、透明導電層4の膜厚が赤色発光素子の膜厚よりも薄膜の場合(以下、色度重視設計1という)と、厚膜の場合(以下、色度重視設計2という)がある。
(3)効率重視設計と色度重視設計の比較
図11は、効率重視設計、色度重視設計1及び2の各設計における最適条件下での透明導電層4の膜厚と、そのときの(式1)における光学膜厚Lと数値m、デバイス特性として発光効率とカラーフィルタ透過率を示す。
(4)正孔注入層、正孔輸送層の膜厚の変更
上述の実施形態では、実験において透明導電層4の膜厚を変更していたが、色度重視設計を行う場合に重要なパラメータは、透明導電層4の膜厚ではなく、透明導電層4、正孔注入層5、正孔輸送層6の光学膜厚の合計Lである。発光素子の発光効率を高めるという効果は、直接光と反射光との干渉により得られるものと考えられるためである。
3.各部材料
基板1は、例えば、TFT(Thin Film Transistor)基板である。基板1の材料は、例えば、無アルカリガラス、ソーダガラス、無蛍光ガラス、燐酸系ガラス、硼酸系ガラス、石英、アクリル系樹脂、スチレン系樹脂、ポリカーボネート系樹脂、エポキシ系樹脂、ポリエチレン、ポリエステル、シリコーン系樹脂、又はアルミナ等の絶縁性材料である。
4.まとめ
以上説明したように、青色発光素子は、効率重視設計によると、発光色の色度が目標色度より大きくズレてしまうため、カラーフィルタによる色度の補正を行うと効率が激減してしまう。一方、色度重視設計によると、ここでは透明導電層4の膜厚を156nm以上166nm以下とすることで、放射色の色純度をディスプレイに必要な目標色度まで高めることができ、さらに発光効率を高めることができる。この効果は、直接光と反射光との干渉により得られるものと考えられる。その場合、透明導電層4の膜厚が156nm以上166nm以下とすることが重要なのではなく、透明導電膜4、正孔注入層5、正孔輸送層6の光学膜厚の合計Lが重要であるといえる。従って、青色発光素子では、透明導電層4、正孔注入層5、正孔輸送層6の光学膜厚の合計Lを455.4nmから475.8nmとすればよく、この条件を満たす限り、同様の効果を得ることができる。
5.変形例
なお、本発明を上記の実施の形態に基づいて説明してきたが、本発明は、上記の実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。
2 バンク
3 反射電極
4 透明導電層
5 正孔注入層
6 正孔輸送層
7b、7g、7r 発光層
8 電子輸送層
9 透明電極
10 薄膜封止層
11 樹脂封止層
12b、12g、12r、12br カラーフィルタ
13 ガラス
15 表示装置
Claims (4)
- 複数の発光素子が配列された表示装置であって、
前記複数の発光素子は、それぞれ、反射電極と透明電極との間に配された、波長が455nmの青色光、波長が510nmの緑色光、赤色光のいずれかを放射する発光層と、前記反射電極と前記発光層との間に介挿された機能層とを有し、
前記反射電極において光が反射する際の位相シフトφ/2πが0.7であり、
前記反射電極と前記青色光を放射する発光層との間の光学距離が、455.4nm以上475.8nm以下であり、
前記反射電極と前記緑色光を放射する発光層との間の光学距離が、290.4nm以上338.4nm以下である
ことを特徴とする表示装置。 - 前記赤色光の波長が640nmであり、
前記反射電極と前記赤色光を放射する発光層との間の光学距離が、403.5nm以上424.9nm以下である請求項1に記載の表示装置。 - 複数の発光素子が配列された表示装置であって、
前記複数の発光素子は、それぞれ、反射電極と透明電極との間に配された、波長が455nmの青色光、緑色光、波長が640nmの赤色光のいずれかを放射する発光層と、前記反射電極と前記発光層との間に介挿された機能層とを有し、
前記反射電極において光が反射する際の位相シフトφ/2πが0.7であり、
前記反射電極と前記青色光を放射する発光層との間の光学距離が、455.4nm以上475.8nm以下であり、
前記反射電極と前記赤色光を放射する発光層との間の光学距離が、403.5nm以上424.9nm以下である
ことを特徴とする表示装置。 - 透明電極に対向してカラーフィルタを備えることを特徴とする請求項1〜3の何れかに記載の表示装置。
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