JP7441176B2 - 表示装置および電子機器 - Google Patents
表示装置および電子機器 Download PDFInfo
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- JP7441176B2 JP7441176B2 JP2020556357A JP2020556357A JP7441176B2 JP 7441176 B2 JP7441176 B2 JP 7441176B2 JP 2020556357 A JP2020556357 A JP 2020556357A JP 2020556357 A JP2020556357 A JP 2020556357A JP 7441176 B2 JP7441176 B2 JP 7441176B2
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- transistor
- electrode
- circuit
- capacitor
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
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- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
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- 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
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Description
図2は、画素回路を説明する図である。
図3A乃至図3Cは、画素回路を説明する図である。
図4は、画素回路を説明する図である。
図5は、画素回路の動作を説明するタイミングチャートである。
図6A乃至図6Cは、画素回路を説明する図である。
図7は、画素回路を説明する図である。
図8は、画素回路を説明する図である。
図9は、画素回路を説明する図である。
図10A乃至図10Cは、画素レイアウトを説明する図である。
図11Aは、ソースドライバを説明する図である。図11B、図11Cは、トランジスタを説明する図である。
図12Aは、ソースドライバを説明する図である。図12B、図12Cは、トランジスタを説明する図である。
図13A乃至図13Cは、表示装置を説明する図である。
図14A、図14Bは、タッチパネルを説明する図である。
図15A、図15Bは、表示装置を説明する図である。
図16は、表示装置を説明する図である。
図17A、図17Bは、表示装置を説明する図である。
図18A、図18Bは、表示装置を説明する図である。
図19A乃至図19Eは、表示装置を説明する図である。
図20A1乃至図20C2は、トランジスタを説明する図である。
図21A1乃至図21C2は、トランジスタを説明する図である。
図22A1乃至図22C2は、トランジスタを説明する図である。
図23A1乃至図23C2は、トランジスタを説明する図である。
図24A乃至図24Fは、電子機器を説明する図である。
図25A、図25Bは、トランジスタのID-VG特性を説明する図である。
図26Aは、EL画素回路を説明する図である。図26Bは、タイミングチャートである。
図27A、図27Bは、液晶画素回路を説明する図である。
図28は、ソースドライバのブロック図である。
図29A、図29Bは、ソースドライバの消費電力のシミュレーション結果を説明する図である。
図30は、パネルの消費電力の実測結果を説明する図である。
図31Aは、液晶デバイスの透過率を説明する図である。図31Bは、液晶表示パネルの輝度を説明する図である。
図32Aは、EL表示パネルの表示画像写真である。図32Bは、液晶表示パネルの表示画像写真である。
本実施の形態では、本発明の一態様である表示装置について、図面を参照して説明する。
本実施の形態では、液晶デバイスを用いた表示装置の構成例と、発光デバイスを用いた表示装置の構成例について説明する。なお、本実施の形態においては、実施の形態1で説明した表示装置の要素、動作および機能の説明は省略する。
本実施の形態では、上記実施の形態に示した各トランジスタに置き換えて用いることのできるトランジスタの一例について、図面を用いて説明する。
図20A1は、ボトムゲート型のトランジスタの一種であるチャネル保護型のトランジスタ810のチャネル長方向の断面図である。図20A1において、トランジスタ810は基板771上に形成されている。また、トランジスタ810は、基板771上に絶縁層772を介して電極746を有する。また、電極746上に絶縁層726を介して半導体層742を有する。電極746はゲート電極として機能できる。絶縁層726はゲート絶縁層として機能できる。
図22A1に例示するトランジスタ842は、トップゲート型のトランジスタの1つである。電極744aおよび電極744bは、絶縁層728および絶縁層729に形成した開口部において半導体層742と電気的に接続する。
本発明の一態様に係る表示装置を用いることができる電子機器として、表示機器、パーソナルコンピュータ、記録媒体を備えた画像記憶装置または画像再生装置、携帯電話、携帯型を含むゲーム機、携帯データ端末、電子書籍端末、ビデオカメラ、デジタルスチルカメラ等のカメラ、ゴーグル型ディスプレイ(ヘッドマウントディスプレイ)、ナビゲーションシステム、音響再生装置(カーオーディオ、デジタルオーディオプレイヤー等)、複写機、ファクシミリ、プリンタ、プリンタ複合機、現金自動預け入れ払い機(ATM)、自動販売機などが挙げられる。これら電子機器の具体例を図24に示す。
図26Aに、表示素子として発光デバイスを用いた画素の回路図を示す。画素回路には、1個のトランジスタ(M4)と1個のキャパシタ(CW)で構成されるメモリ回路を設けており、画素回路全体として、5個のトランジスタ(M1乃至M5)と、2個のキャパシタ(CW、CS)と、発光デバイス(OLED)を有する構成とした。また、全てのトランジスタにフロントゲートと電気的に接続するバックゲートを設けた。画素回路が有する要素は、ゲート線(GL1乃至GL3)、ソース線(SL、SLW)、電源線(ANODE、CATHODE)、基準電位線(V0)の少なくとも一つと電気的な接続を有する。また、画素回路は、いくつかの要素が接続されるnode Aおよびnode Bを有する。詳細は、図2の説明を参照することができる。
まず、ゲート線GL1を高電位とし、トランジスタM4、M5を導通させてnode Aに基準電位線(V0)から供給される基準電位V0を書き込む。また、node Bにソース線SLWに供給される電位(Vw)を書き込む。
次に、ゲート線GL1を低電位、ゲート線GL2を高電位とし、node Aにソース線SLに供給される電位(Vdata)を書き込む。このとき、node B(トランジスタM2のゲート)の電圧Vgは、(Cw(Vw-V0)+Cs(Vw-V0)+Cw・Vdata)/(Cw+Cs)となる。なお、CwはキャパシタCWの容量値、CsはキャパシタCSの容量値である。
図27Aに、表示素子として液晶デバイスを用いた画素の回路図を示す。画素回路には、EL画素回路と同様に1個のトランジスタ(M4)と1個のキャパシタ(CW)で構成されるメモリ回路を設けている。画素回路全体として、2個のトランジスタ(M1、M4)と、2個のキャパシタ(CW、CS)と、液晶デバイス(LC)を有する構成とした。また、全てのトランジスタにフロントゲートと電気的に接続するバックゲートを設けた。画素回路が有する要素は、ゲート線(GL1、GL2)、ソース線(SL、SLW)、基準電位線(TCOM、CSCOM)のいずれかの少なくとも一つと電気的な接続を有する。また、画素回路は、いくつかの要素が接続されるnode Aおよびnode Bを有する。詳細は、図6Aの説明を参照することができる。なお、EL画素回路と共通する要素には共通の符号を用いている。
まず、ゲート線GL1、GL2を高電位とし、トランジスタM1、M4を導通させてnode Aにソース線SLに供給される電位(基準電位Vr)を書き込む。また、node BにSLWに供給される電位(Vw)を書き込む。
次に、ゲート線GL1を低電位、ゲート線GL2を高電位とし、M4のみを非導通としてnode Aにソース線SLに供給される電位(Vdata)を書き込む。このとき、キャパシタCWの容量結合によりnode Bの電位は、(Cw(Vw-Vr)+(Cs+Clc)・(Vw-Vr)+Cw・Vdata)/(Cw+Cs+Clc)となる。なお、Clcは、液晶デバイスLCの容量値である。
前述した効果を利用すると、EL画素回路において、電圧Vgとして最大5Vの電圧が必要な場合、ソースドライバの出力電圧は、5Vよりも小さな値とすることができる。電圧Vgは、キャパシタCWとキャパシタCSの容量比にも依存するが、ソースドライバの出力電圧は、例えば3.3Vでも十分となる。
表1に、試作したEL表示パネルの仕様を示す。ゲートドライバは、OSトランジスタで画素回路と同じ基板上に設けた。発光デバイスには白色タンデム型の有機ELデバイスを使用し、カラーフィルタによりカラー化する方式を採用した。図32Aは、試作したEL表示パネルの表示結果である。
表2に示す仕様の液晶表示パネルを試作した。ゲートドライバは、OSトランジスタで画素回路と同じ基板上に設けた。ソースドライバには-4V乃至+4Vまで出力できるICチップを使用した。FFSモードの液晶材料を用い、図31Aに示すように飽和電圧が10Vとなる条件で試作した。この電圧はソースドライバの出力電圧より高いため、従来の画素回路では液晶デバイスを飽和動作させることができない。
Claims (6)
- ドライバ回路と、画素回路と、を有する表示装置であって、
前記ドライバ回路は、シフトレジスタ回路と、アンプ回路と、を有し、
前記画素回路は、前記アンプ回路から出力される第1のデータおよび第2のデータを加算して第3のデータを生成する機能を有し、
前記シフトレジスタ回路は、第1のトランジスタを有し、
前記アンプ回路は、第2のトランジスタを有し、
前記第1のトランジスタおよび前記第2のトランジスタにおいて、一方のトランジスタのゲート絶縁膜の厚さがaの領域を有するとき、他方のトランジスタは、ゲート絶縁膜の厚さが0.9a以上1.1a以下の領域を有し、
前記画素回路は、第3のトランジスタと、第4のトランジスタと、第5のトランジスタと、第6のトランジスタと、第7のトランジスタと、第1のキャパシタと、第2のキャパシタと、発光デバイスと、を有し、
前記第3のトランジスタのソースまたはドレインの一方は、前記第1のキャパシタの一方の電極と電気的に接続され、
前記第1のキャパシタの他方の電極は、前記第4のトランジスタのソースまたはドレインの一方と電気的に接続され、
前記第4のトランジスタのソースまたはドレインの一方は前記第5のトランジスタのソースまたはドレインの一方と電気的に接続され、
前記第1のキャパシタの一方の電極は、前記第6のトランジスタのゲートと電気的に接続され、
前記第6のトランジスタのソースまたはドレインの一方は、前記第7のトランジスタのソースまたはドレインの一方と電気的に接続され、
前記第7のトランジスタのソースまたはドレインの一方は、前記発光デバイスの一方の電極と電気的に接続され、
前記発光デバイスの一方の電極は、前記第2のキャパシタの一方の電極と電気的に接続され、
前記第2のキャパシタの他方の電極は、前記第6のトランジスタのゲートと電気的に接続されている表示装置。 - ドライバ回路と、画素回路と、を有する表示装置であって、
前記ドライバ回路は、シフトレジスタ回路と、アンプ回路と、を有し、
前記画素回路は、前記アンプ回路から出力される第1のデータおよび第2のデータを加算して第3のデータを生成する機能を有し、
前記シフトレジスタ回路は、第1のトランジスタを有し、
前記アンプ回路は、第2のトランジスタを有し、
前記第1のトランジスタおよび前記第2のトランジスタにおいて、一方のトランジスタのゲート絶縁膜の厚さがaの領域を有するとき、他方のトランジスタは、ゲート絶縁膜の厚さが0.9a以上1.1a以下の領域を有し、
前記画素回路は、第3のトランジスタと、第4のトランジスタと、第5のトランジスタと、第1のキャパシタと、第2のキャパシタと、液晶デバイスと、を有し、
前記第3のトランジスタのソースまたはドレインの一方は、前記第1のキャパシタの一方の電極と電気的に接続され、
前記第1のキャパシタの他方の電極は、前記第4のトランジスタのソースまたはドレインの一方と電気的に接続され、
前記第4のトランジスタのソースまたはドレインの一方は、前記第5のトランジスタのソースまたはドレインの一方と電気的に接続され、
前記第1のキャパシタの一方の電極は、前記第2のキャパシタの一方の電極と電気的に接続され、
前記第2のキャパシタの一方の電極は、前記液晶デバイスの一方の電極と電気的に接続されている表示装置。 - 請求項1または請求項2において、
前記第3のトランジスタのソースまたはドレインの他方は、前記第4のトランジスタのソースまたはドレインの他方と電気的に接続されている表示装置。 - 請求項1乃至請求項3のいずれか一項において、
前記画素回路が有するトランジスタは、チャネル形成領域に金属酸化物を有し、前記金属酸化物は、Inと、Znと、M(MはAl、Ti、Ga、Sn、Y、Zr、La、Ce、NdまたはHf)と、を有する表示装置。 - 請求項1乃至請求項4のいずれか一項において、
前記ドライバ回路は、さらに、入力インターフェイス回路、シリアルパラレル変換回路、ラッチ回路、レベルシフト回路、PTL、デジタルアナログ変換回路、およびバイアス生成回路の中から選ばれる一つ以上の回路を有し、当該回路が有するトランジスタは、ゲート絶縁膜の厚さが0.9a以上1.1a以下の領域を有する表示装置。 - 請求項1乃至請求項5のいずれか一項に記載の表示装置と、カメラと、を有する電子機器。
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