JP2019186384A - 表示装置及び表示装置の製造方法 - Google Patents
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Abstract
Description
図1を参照して、本実施形態に係る、表示装置の全体構成を説明する。なお、説明をわかりやすくするため、図示した物の寸法、形状については、誇張して記載している場合もある。以下において、表示装置の例として、OLED(Organic Light−Emitting Diode)表示装置を説明するが、本開示の特徴は、液晶表示装置や量子ドット表示装置等、OLED表示装置と異なる任意の種類の表示装置に適用することができる。
基板100上には、複数の副画素のアノード電極にそれぞれ供給する電流を制御する複数の画素回路が形成されている。図3Aは、画素回路の構成例を示す。各画素回路は、第1のトランジスタT1と、第2のトランジスタT2と、第3のトランジスタT3と、保持容量Cとを含む。画素回路は、副画素であるOLED素子E1の発光を制御する。トランジスタは、TFT(Thin Film Transistor)である。以下、第1のトランジスタT1〜第3のトランジスタT3をそれぞれトランジスタT1〜トランジスタT3と略記する。
図4は、ドライバIC134の論理要素を示す。ドライバIC134は、ガンマ変換部341、相対輝度変換部342、逆ガンマ変換部343、駆動信号生成部344、及びデータドライバ345を含む。
図5は、デルタナブラパネルにおける画素配置を示す。図5は、表示領域125の境界(表示領域125の端)を含む一部の領域を模式的に示す。図5は、凸状の曲線的な境界を示す部分を示す。曲線255は、表示領域125の設計上の仮想的な境界線を示す。曲線255に従って、表示領域125の端の画素及び副画素の配置が決定されている。以下において、凸状又は凹上の曲線的な境界を示す部分を、Rコーナ部とも呼ぶ。
発明者の検討によれば、Rコーナ部において、終端画素の緑副画素が外向きである場合、その終端画素(の緑副画素)が視認されやすく、Rコーナ部における刻み目が目立ちやすい。そこで、OLED表示装置10は、Rコーナ部において視認されやすい画素の輝度を相対的に低下させる。
画素回路における駆動トランジスタの構造及びOLED表示装置10の製造方法の一例を説明する。上述のように、OLED表示装置10は、特定の位置に配置される画素、例えば、緑副画素外向き終端画素、の同一信号に対する輝度を小さくするため、特定位置の画素の駆動トランジスタに対して、通常画素である内部画素56の駆動トランジスタよりも小さいチャネル幅を与える。
Claims (14)
- 表示装置であって、
表示領域において、それぞれ第1方向に配列された複数の第1種画素からなる、複数の第1種画素ラインと、
前記表示領域において、それぞれ前記第1方向に配列された複数の第2種画素からなる、複数の第2種画素ラインと、
を含み、
前記複数の第1種画素ラインと前記複数の第2種画素ラインとは、前記第1方向に垂直な第2方向に交互に配列されており、
前記第1種画素は、前記第2方向に配列された第1赤副画素及び第1青副画素、並びに、前記第1赤副画素及び前記第1青副画素に対して前記第1方向と反対の側に配置され、かつ、前記第2方向において前記第1赤副画素及び前記第1青副画素の間に配置されている第1緑副画素、から構成され、
前記第2種画素は、前記第2方向に配列された第2赤副画素及び第2青副画素、並びに、前記第2赤副画素及び前記第2青副画素に対して前記第1方向の側に配置され、かつ、前記第2方向において前記第2赤副画素及び前記第2青副画素の間に配置されている第2緑副画素、から構成され、
前記複数の第1種画素ラインは、前記第1方向の反対側の端に配置されており、かつ、前記第2方向に配列されている画素ラインにおける前記第2方向の反対側の端に配置されている、複数の終端第1種画素を含み、
前記複数の第2種画素ラインは、前記第1方向の反対側の端に配置されており、かつ、前記第2方向に配列されている画素ラインにおける前記第2方向の反対側の端に配置されている、複数の終端第2種画素を含み、
前記複数の終端第1種画素それぞれの発光素子の駆動トランジスタのチャネル幅は、前記第1方向、前記第1方向の反対方向、前記第2方向、及び前記第2方向の反対方向の4方向において他の画素に囲まれている内部画素の発光素子の駆動トランジスタのチャネル幅よりも小さい、
表示装置。 - 請求項1に記載の表示装置であって、
前記複数の終端第1種画素と前記内部画素の駆動トランジスタのゲート電圧は、同一の入力映像信号に対して、同一である、
表示装置。 - 請求項1に記載の表示装置であって、
前記複数の終端第1種画素は、第1の終端第1種画素及び第2の終端第1種画素を含み、
前記第1の終端第1種画素に対して前記第2方向の側において隣接している第2種画素は、前記第1方向の反対側において、第2種画素ラインの端に配置されており、
前記第2の終端第1種画素に対して前記第2方向において隣接している第2種画素は、前記第1方向の反対側に配置されている他の第2種画素に隣接し、
前記第1の終端第1種画素の駆動トランジスタのチャネル幅は、前記第2の終端第1種画素の駆動トランジスタのチャネル幅よりも小さい、
表示装置。 - 請求項1に記載の表示装置であって、
前記複数の終端第2種画素の駆動トランジスタのチャネル幅は、前記複数の終端第1種画素の駆動トランジスタのチャネル幅よりも大きい、
表示装置。 - 請求項4に記載の表示装置であって、
前記複数の終端第2種画素の駆動トランジスタのチャネル幅は、前記内部画素の駆動トランジスタのチャネル幅と同一である、
表示装置。 - 請求項1に記載の表示装置であって、
前記複数の終端第1種画素の両端の終端第1種画素に挟まれる終端第1種画素の緑副画素は、前記両端の終端第1種画素の緑副画素を結ぶ直線よりも外側に配置されている、
表示装置。 - 請求項6に記載の表示装置であって、
前記複数の終端第1種画素は、第1の終端第1種画素及び第2の終端第1種画素を含み、
前記第1の終端第1種画素と、前記第1の終端第1種画素の両側の終端第1種画素それぞれとを結ぶ直線の間の角度は、前記第2の終端第1種画素と前記第2の終端第1種画素の両側の終端第1種画素それぞれとを結ぶ直線の間の角度よりも小さく、
前記第1の終端第1種画素の駆動トランジスタのチャネル幅は、前記第2の終端第1種画素の駆動トランジスタのチャネル幅よりも小さい、
表示装置。 - 請求項1に記載の表示装置であって、
前記表示領域は、複数の終端第1種画素からなる第1グループと、前記第1グループと異なる複数の終端第1種画素からなる第2グループとを含み、
前記第1グループにおいて、両端の終端第1種画素に挟まれる終端第1種画素の緑副画素は、前記両端の終端第1種画素の緑副画素を結ぶ直線よりも外側に配置されており、
前記第2グループにおいて、両端の終端第1種画素に挟まれる終端第1種画素の緑副画素は、前記両端の終端第1種画素の緑副画素を結ぶ直線よりも内側に配置されており、
前記第1グループにおける駆動トランジスタの最小チャネル幅は、前記第2グループにおける駆動トランジスタの最小チャネル幅よりも小さい、
表示装置。 - 表示装置の製造方法であって、
前記表示装置は、
表示領域において、それぞれ第1方向に配列された複数の第1種画素からなる、複数の第1種画素ラインと、
前記表示領域において、それぞれ前記第1方向に配列された複数の第2種画素からなる、複数の第2種画素ラインと、
を含み、
前記複数の第1種画素ラインと前記複数の第2種画素ラインとは、前記第1方向に垂直な第2方向に交互に配列されており、
前記第1種画素は、前記第2方向に配列された第1赤副画素及び第1青副画素、並びに、前記第1赤副画素及び前記第1青副画素に対して前記第1方向と反対の側に配置され、かつ、前記第2方向において前記第1赤副画素及び前記第1青副画素の間に配置されている第1緑副画素、から構成され、
前記第2種画素は、前記第2方向に配列された第2赤副画素及び第2青副画素、並びに、前記第2赤副画素及び前記第2青副画素に対して前記第1方向の側に配置され、かつ、前記第2方向において前記第2赤副画素及び前記第2青副画素の間に配置されている第2緑副画素、から構成され、
前記複数の第1種画素ラインは、前記第1方向の反対側の端に配置されており、かつ、前記第2方向に配列されている画素ラインにおける前記第2方向の反対側の端に配置されている、複数の終端第1種画素を含み、
前記複数の第2種画素ラインは、前記第1方向の反対側の端に配置されており、かつ、前記第2方向に配列されている画素ラインにおける前記第2方向の反対側の端に配置されている、複数の終端第2種画素を含み、
前記表示装置の製造方法は、
基板上に、前記複数の第1種画素及び前記複数の第2種画素それぞれの駆動トランジスタを形成するステップと、
前記基板上に、前記駆動トランジスタにより駆動される発光素子を形成するステップと、を含み、
前記駆動トランジスタを形成するステップは、
半導体層を形成するステップと、
前記半導体層を、フォトマスクを使用してパターニングして、前記複数の第1種画素及び前記複数の第2種画素それぞれの駆動トランジスタのチャネルを含む半導体パターンを形成するステップと、を含み、
前記フォトマスクは、前記複数の終端第1種画素それぞれの駆動トランジスタのチャネル幅が、前記第1方向、前記第1方向の反対方向、前記第2方向、及び前記第2方向の反対方向の4方向において他の画素に囲まれている内部画素の駆動トランジスタのチャネル幅よりも小さくなるような、パターンを有する、
表示装置の製造方法。 - 請求項9に記載の表示装置の製造方法であって、
前記複数の終端第1種画素は、第1の終端第1種画素及び第2の終端第1種画素を含み、
前記第1の終端第1種画素に対して前記第2方向の側において隣接している第2種画素は、前記第1方向の反対側において、第2種画素ラインの端に配置されており、
前記第2の終端第1種画素に対して前記第2方向において隣接している第2種画素は、前記第1方向の反対側に配置されている他の第2種画素に隣接し、
前記フォトマスクは、前記第1の終端第1種画素の駆動トランジスタのチャネル幅が、前記第2の終端第1種画素の駆動トランジスタのチャネル幅よりも小さくなるような、パターンを有する、
表示装置の製造方法。 - 請求項9に記載の表示装置の製造方法であって、
前記フォトマスクは、前記複数の終端第2種画素の駆動トランジスタのチャネル幅が、前記複数の終端第1種画素の駆動トランジスタのチャネル幅よりも大きくなるような、パターンを有する、
表示装置の製造方法。 - 請求項11に記載の表示装置の製造方法であって、
前記フォトマスクは、前記複数の終端第2種画素の駆動トランジスタのチャネル幅は、前記内部画素の駆動トランジスタのチャネル幅と同一となるような、パターンを有する、
表示装置の製造方法。 - 請求項12に記載の表示装置の製造方法であって、
前記複数の終端第1種画素は、第1の終端第1種画素及び第2の終端第1種画素を含み、
前記第1の終端第1種画素と、前記第1の終端第1種画素の両側の終端第1種画素それぞれとを結ぶ直線の間の角度は、前記第2の終端第1種画素と前記第2の終端第1種画素の両側の終端第1種画素それぞれとを結ぶ直線の間の角度よりも小さく、
前記フォトマスクは、前記第1の終端第1種画素の駆動トランジスタのチャネル幅が、前記第2の終端第1種画素の駆動トランジスタのチャネル幅よりも小さくなるような、パターンを有する、
表示装置の製造方法。 - 請求項9に記載の表示装置の製造方法であって、
前記表示領域は、複数の終端第1種画素からなる第1グループと、前記第1グループと異なる複数の終端第1種画素からなる第2グループとを含み、
前記第1グループにおいて、両端の終端第1種画素に挟まれる終端第1種画素の緑副画素は、前記両端の終端第1種画素の緑副画素を結ぶ直線よりも外側に配置されており、
前記第2グループにおいて、両端の終端第1種画素に挟まれる終端第1種画素の緑副画素は、前記両端の終端第1種画素の緑副画素を結ぶ直線よりも内側に配置されており、
前記フォトマスクは、前記第1グループにおける駆動トランジスタの最小チャネル幅が、前記第2グループにおける駆動トランジスタの最小チャネル幅よりも小さくなるような、パターンを有する、
表示装置の製造方法。
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