JP7412360B2 - 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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- JP7412360B2 JP7412360B2 JP2020570660A JP2020570660A JP7412360B2 JP 7412360 B2 JP7412360 B2 JP 7412360B2 JP 2020570660 A JP2020570660 A JP 2020570660A JP 2020570660 A JP2020570660 A JP 2020570660A JP 7412360 B2 JP7412360 B2 JP 7412360B2
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- transistor
- potential
- wiring
- electrode
- circuit
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- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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Description
図2Aは、昇圧回路を説明する図である。図2Bは、昇圧回路の動作を説明するタイミングチャートである。
図3A、図3Bは、昇圧回路を説明する図である。
図4は、昇圧回路を説明する図である。
図5は、昇圧回路の動作を説明するタイミングチャートである。
図6Aは、昇圧回路を説明する図である。図6Bは、昇圧回路の動作を説明するタイミングチャートである。
図7は、昇圧回路を説明する図である。
図8A乃至図8Cは、昇圧回路の他の形態および昇圧回路の他の接続形態を説明する図である。
図9A、図9Bは、画素回路を説明する図である。
図10A乃至図10Dは、表示デバイスを有する回路を説明する図である。
図11A乃至図11Dは、表示デバイスを有する回路を説明する図である。
図12は、トランジスタの他の形態を説明する図である。
図13は、シミュレーションに用いた回路を説明する図である。
図14は、シミュレーション結果を説明する図である。
図15A乃至図15Cは、表示装置を説明する図である。
図16A、図16Bは、タッチパネル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18は、表示装置を説明する図である。
図19A、図19Bは、表示装置を説明する図である。
図20A、図20Bは、表示装置を説明する図である。
図21A乃至図21Eは、表示装置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24A1乃至図24C2は、トランジスタを説明する図である。
図25A1乃至図25C2は、トランジスタを説明する図である。
図26A乃至図26Fは、電子機器を説明する図である。
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。
図1は、本発明の一態様の表示装置を説明する図である。表示装置は、複数の画素10と、回路13と、ソースドライバ11と、ゲートドライバ12を有する。ソースドライバ11は、画素10と電気的に接続される。ゲートドライバ12は、回路13と電気的に接続される。回路13は、画素10と電気的に接続される。
図2Aに、回路13の構成の一例を示す。回路13は、トランジスタ102と、トランジスタ103と、トランジスタ104と、トランジスタ105と、キャパシタ106を有する構成とすることができる。図2では、第n行の画素10と電気的に接続する回路13[n]を示している。
回路13では、まず、第1の入力端子(トランジスタ102のゲートおよびトランジスタ105のゲート)に“V1”(高電位)を入力し、ノードAの電位を”V1”、ノードBの電位を”V0”(低電位)とする。このとき、キャパシタ106には“V1-V0”が保持される。
図2Bのタイミングチャートを用いて、図2Aに示す回路13の動作の一例を説明する。なお、以下の説明またはタイミングチャートにおいて、低電位を“L”、低電位の2倍値を“2L”、低電位の3倍値を“3L”、高電位を“H”、高電位の2倍値を“2H”、高電位の3倍値を“3H”で表す。また、配線121には“H”、配線122には“L”、配線124には“H”または“L”が供給される条件とする。
図3Aに、回路13の変形例を示す。図3Aに示す回路13は、回路14を有する点、およびトランジスタ102のソースまたはドレインの他方が配線123と電気的に接続する点が図2Aに示す回路13と異なる。回路14は、回路13が出力する電圧を高める機能を有する回路である。
図3Bに、回路13の別の変形例を示す。図3Bに示す回路13は、回路15を有する点が図2Aに示す回路13と異なる。回路15は、配線125への低電位の供給を制御する回路である。
図3Bに示す回路13は、図2Bに示すタイミングチャートに従って動作させることができる。なお、トランジスタ102のリーク電流が比較的高かったとしても、時刻T6以降もノードAの電位は一定に保つことができる。
図4に、回路13の別の変形例を示す。なお、上述した回路13は、入力端子を3個有する例であるが、図4に示す回路13は、入力端子を4個有する例である。当該構成では、前述した回路13よりも昇圧機能を高めることができる。
昇圧に関する基本的な動作は、図2Aに示す回路13と同じである。図5のタイミングチャートを用いて、図4に示す回路13の動作の一例を説明する。なお、配線121には“H”、配線122には“L”、配線124には“H”または“L”が供給される条件とする。
図6Aに、回路13の別の変形例を示す。図6に示す回路13は、簡略化した構成であり、図2Aに示す回路13からトランジスタ103およびトランジスタ105を省いた構成である。当該構成では、キャパシタ106の他方の電極に配線124[n]が電気的に接続される。つまり、キャパシタ106の他方の電極が第2の入力端子として機能する。
昇圧に関する基本的な動作は、図2Aに示す回路13と同じである。トランジスタ103を省いているため、昇圧動作は、第2の入力端子に“H”の信号電圧が入力される期間に依存する。
図1乃至図7では、ゲートドライバ12の出力端子に回路13が接続される構成として説明したが、図8Aに示すように、回路13は、ゲートドライバ12の構成要素であってもよい。当該構成では、ゲートドライバ12の内部で昇圧が行われるということになる。また、ゲートドライバ12が有するシフトレジスタなどの回路と、回路13は積層してもよい。これらを積層することで、表示装置を狭額縁化することができる。
画素10は、図2に示す構成のほか、図9Aに示す構成としてもよい。図9Aに示す画素10は、入力されたデータ電圧を昇圧する機能を有する。図9Aに示す画素10は、トランジスタ116、トランジスタ117、キャパシタ118および回路21を有し、2本のゲート線(配線125、配線126)、および2本のソース線(配線127、配線128)と電気的に接続される。配線125および配線126には、それぞれ異なる回路13が電気的に接続される。
図10A乃至図10Dは、回路21に適用でき、表示デバイスとして液晶デバイスを含む構成の例である。
また、図12に例示するように、本発明の一態様の回路では、バックゲートを設けたトランジスタを用いてもよい。図12では、バックゲートがフロントゲートと電気的に接続された構成を示しており、オン電流を高める効果を有する。または、バックゲートが定電位を供給できる配線と電気的に接続された構成であってもよい。当該構成では、トランジスタのしきい値電圧を制御することができる。なお、回路21が有するトランジスタにもバックゲートを設けてもよい。
次に、画素の動作に関するシミュレーション結果を説明する。図13にシミュレーションに用いた画素10の構成を示す。シミュレーションは、図6Aに示した回路構成を用い、図6Bに示すタイミングチャートの動作を対象とした。
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22A1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22A1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24A1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26に示す。
Claims (8)
- シフトレジスタと、昇圧回路と、画素と、を有する表示装置であって、
前記シフトレジスタは、第1の出力端子と、第2の出力端子と、第3の出力端子と、を有し、
前記昇圧回路は、第1のトランジスタと、第2のトランジスタと、第3のトランジスタと、第4のトランジスタと、第1のキャパシタと、を有し、
前記画素は、第5のトランジスタを有し、
前記第1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のキャパシタの一方の電極は、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と電気的に接続され、
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5のトランジスタのゲート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2のトランジスタのソースまたはドレインの一方および前記第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1のトランジスタのゲートおよび前記第4のトランジスタのゲートは、前記第1の出力端子と電気的に接続され、
前記第2のトランジスタのゲートは、前記第2の出力端子と電気的に接続され、
前記第3のトランジスタのゲートは、前記第3の出力端子と電気的に接続される表示装置。 - 請求項1において、
前記シフトレジスタは、前記第1の出力端子、前記第2の出力端子、前記第3の出力端子の順に信号電圧を出力する表示装置。 - 請求項1または2において、
前記昇圧回路は、さらに第6のトランジスタと、第2のキャパシタと、を有し、
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1の出力端子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他方は、前記第2のキャパシタの一方の電極および前記第1のトランジスタのゲート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1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ている表示装置。 - 請求項1または2において、
前記昇圧回路は、さらに第7のトランジスタと、第8のトランジスタと、第3のキャパシタと、を有し、
前記第7のトランジスタのゲートは、前記第3の出力端子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、前記第3のキャパシタの一方の電極、前記第3のトランジスタのゲートおよび前記第8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8のトランジスタのゲートは、前記第1の出力端子と電気的に接続される表示装置。 - 請求項1乃至4のいずれか一項において、
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と、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は電気的に接続されている表示装置。 - 請求項1乃至5のいずれか一項において、
前記画素は、表示素子を有し、
前記表示素子は、液晶デバイスである表示装置。 - 請求項1乃至6のいずれか一項において、
前記昇圧回路および前記画素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、Ge、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7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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