JP2009224595A - 有機電界発光表示装置及びその製造方法 - Google Patents
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Abstract
【解決手段】多数の発光セルのそれぞれについて、有機電界発光部に対する通電を制御する第1のトランジスタ20Aと、前記第1のトランジスタの入力に与える信号をスイッチングする第2のトランジスタ20Bとを設けると共に、非晶質酸化物TFTにより各トランジスタを形成し、(第1のトランジスタの出力電流)<(第2のトランジスタの出力電流)の条件を満たすように、移動度μを作り分けて第1のトランジスタ及び第2のトランジスタを形成した。
【選択図】図4
Description
Vp=Vgs−Vth
Cox=ε0・εr/d
μ:移動度
W:トランジスタのチャネル幅
L:トランジスタのチャネル長さ(ドレイン−ソース間の距離)
Vth:トランジスタのしきい値電圧
Vp:プログラム電圧
ε0・εr:ゲート絶縁膜材料の誘電率
d:ゲート絶縁膜厚
図7に示すように、基板60上に絶縁膜を形成後、その上に、トランジスタを構成するゲート電極61、62を電極材料の成膜及びパターニングにより形成する。更に、これらの上にゲート絶縁膜63、64を、絶縁材料の成膜及びパターニングにより形成する。次に、これらの上に2つの活性層65、66を形成する。活性層65、66の形成に関しては次のように処理する。
アルゴン(Ar)流量:12sccm
酸素(O2)流量 :1.4sccm
高周波パワー :200W
圧力 :0.4Pa
電気伝導度 :5.7×10−3Scm−1
電子キャリア濃度:1×1016cm−3
ホール移動度 :3.0cm2/V・S
電気伝導度 :4.0×101Scm−1
電子キャリア濃度:3×1019cm−3
ホール移動度 :8.3cm2/V・S
図8に示すように、基板70上に絶縁膜を形成後、その上に、トランジスタを構成するゲート電極71、72を電極材料の成膜及びパターニングにより形成する。更に、これらの上にゲート絶縁膜73、74を、絶縁材料の成膜及びパターニングにより形成する。次に、これらの上に2つの活性層75、76を形成する。活性層75、76の形成に関しては次のように処理する。
アルゴン(Ar)流量:12sccm
酸素(O2)流量 :1.4sccm
高周波パワー :200W
圧力 :0.4Pa
電気伝導度 :5.7×10−3Scm−1
電子キャリア濃度:1×1016cm−3
ホール移動度 :3.0cm2/V・S
電気伝導度 :1.0×102Scm−1
電子キャリア濃度:8×1019cm−3
ホール移動度 :19.2cm2/V・S
20,20A,20B,20C 駆動用トランジスタ
30 キャパシタ
40,40A,40B,40C スイッチング用トランジスタ
51 電源ライン
52 アースライン
53 信号ライン
54 選択制御ライン
60,70 基板
61,62,71,72 ゲート電極
63,64,73,74 絶縁膜
65,66 活性層
67 紫外線マスク
67a 開口部
68 紫外線光源
75,76 活性層
77 マスク
77a 開口部
78 Arプラズマ装置
Claims (8)
- それぞれが有機電界発光部を有する多数の発光セルが基板上に配設された有機電界発光表示装置であって、
前記発光セルのそれぞれについて、前記有機電界発光部に対する通電を制御する第1のトランジスタと、前記第1のトランジスタの入力に与える信号をスイッチングする第2のトランジスタとが設けられ、
前記第1のトランジスタ及び第2のトランジスタの各々の活性層が非晶質酸化物半導体により形成され、
前記第1のトランジスタと前記第2のトランジスタとをそれぞれ同一条件で駆動したとき、(第1のトランジスタの出力電流量)<(第2のトランジスタの出力電流量)の条件を満たすように、前記第1のトランジスタ及び第2のトランジスタが形成されている有機電界発光表示装置。 - 請求項1記載の有機電界発光表示装置であって、
(前記第1のトランジスタの移動度)<(前記第2のトランジスタの移動度)となっている有機電界発光表示装置。 - 請求項2記載の有機電界発光表示装置であって、
(前記第1のトランジスタの活性層の電子キャリア濃度)<(前記第2のトランジスタの活性層の電子キャリア濃度)となっている有機電界発光表示装置。 - 請求項2又は3記載の有機電界発光表示装置であって、
(前記第1のトランジスタのゲート絶縁膜厚)>(前記第2のトランジスタのゲート絶縁膜厚)となっている有機電界発光表示装置。 - 請求項2〜4のいずれか1項記載の有機電界発光表示装置であって、
(前記第1のトランジスタのゲート絶縁膜の誘電率)<(前記第2のトランジスタのゲート絶縁膜の誘電率)となっている有機電界発光表示装置。 - 請求項1〜5のいずれか1項記載の有機電界発光表示装置であって、
前記非晶質酸化物半導体が、In−Ga−Zn−O系又はIn−Zn−O系の酸化物半導体である有機電界発光表示装置。 - それぞれが有機電界発光部を有する多数の発光セルが基板上に配設され、前記発光セルのそれぞれについて、前記有機電界発光部に対する通電を制御する第1のトランジスタと、前記第1のトランジスタの入力に与える信号をスイッチングする第2のトランジスタとが設けられた有機電界発光表示装置の製造方法であって、
基板上に、前記第1のトランジスタの活性層と前記第2のトランジスタの活性層とを非晶質酸化物半導体により形成する第1のステップと、
前記第1のトランジスタの活性層のみを遮光用のマスクで覆った後、前記第2のトランジスタの活性層に紫外線又はプラズマを照射して、前記第2のトランジスタの活性層の電子キャリア濃度を、前記第1のトランジスタの活性層の電子キャリア濃度よりも高くする第2のステップとを含む有機電界発光表示装置の製造方法。 - それぞれが有機電界発光部を有する多数の発光セルが基板上に配設され、前記発光セルのそれぞれについて、前記有機電界発光部に対する通電を制御する第1のトランジスタと、前記第1のトランジスタの入力に与える信号をスイッチングする第2のトランジスタとが設けられた有機電界発光表示装置の製造方法であって、
基板上に、前記第1のトランジスタの活性層と前記第2のトランジスタの活性層とを非晶質酸化物半導体により形成する第1のステップと、
前記第1のトランジスタの活性層のみを遮光用のマスクで覆った後、前記第2のトランジスタの活性層に紫外線又はプラズマを照射する第2のステップと、
前記第2のトランジスタの活性層のみを遮光用のマスクで覆った後、前記第1のトランジスタの活性層に紫外線又はプラズマを照射する第3のステップとを含み、
(前記第1のトランジスタの活性層への前記紫外線又はプラズマの照射量)<(前記第2のトランジスタの活性層への前記紫外線又はプラズマの照射量)として、前記第2のトランジスタの活性層の電子キャリア濃度を、前記第1のトランジスタの活性層の電子キャリア濃度よりも高くする有機電界発光表示装置の製造方法。
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US12/404,610 US20090230392A1 (en) | 2008-03-17 | 2009-03-16 | Organic electroluminescent display device and method of producing the same |
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Cited By (16)
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JP2011100723A (ja) * | 2009-10-09 | 2011-05-19 | Semiconductor Energy Lab Co Ltd | 発光表示装置及び当該発光表示装置を具備する電子機器 |
JP2011166132A (ja) * | 2010-01-15 | 2011-08-25 | Semiconductor Energy Lab Co Ltd | 半導体装置 |
JP2011166133A (ja) * | 2010-01-15 | 2011-08-25 | Semiconductor Energy Lab Co Ltd | 半導体装置 |
JP2011221127A (ja) * | 2010-04-06 | 2011-11-04 | Semiconductor Energy Lab Co Ltd | 表示装置、及びその駆動方法 |
JP2012078798A (ja) * | 2010-09-08 | 2012-04-19 | Semiconductor Energy Lab Co Ltd | El表示装置及び当該el表示装置を具備する電子機器 |
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JP2013168341A (ja) * | 2012-02-17 | 2013-08-29 | Seiko Epson Corp | 有機el装置および電子機器 |
JP2013168926A (ja) * | 2012-01-18 | 2013-08-29 | Semiconductor Energy Lab Co Ltd | 回路、センサ回路及びセンサ回路を用いた半導体装置 |
JP2015045872A (ja) * | 2010-01-20 | 2015-03-12 | 株式会社半導体エネルギー研究所 | 表示装置 |
JP2015092360A (ja) * | 2010-03-08 | 2015-05-14 | 株式会社半導体エネルギー研究所 | 表示装置 |
JPWO2015037327A1 (ja) * | 2013-09-12 | 2017-03-02 | ソニー株式会社 | 表示装置、その製造方法、および電子機器 |
JPWO2016056204A1 (ja) * | 2014-10-10 | 2017-07-13 | 株式会社Joled | 薄膜トランジスタ基板、薄膜トランジスタ基板の製造方法、及び、表示パネル |
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WO2021005434A1 (ja) * | 2019-07-05 | 2021-01-14 | 株式会社半導体エネルギー研究所 | 表示装置、表示モジュール、及び電子機器 |
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US8728838B2 (en) | 2014-05-20 |
US20090230392A1 (en) | 2009-09-17 |
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