JP7031952B2 - タッチ制御ピクセル駆動回路を駆動する方法とタッチ表示装置 - Google Patents
タッチ制御ピクセル駆動回路を駆動する方法とタッチ表示装置 Download PDFInfo
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Description
本出願は、2017年5月12日に中国特許庁に提出された中国特許出願第201710334833.5号の優先権を主張し、その全ての内容が援用により本出願に取り込まれる。
IOLED=K(VGS-Vth)2 式(1)
ここで、VGSは、前記駆動トランジスタDTFTの制御端子と第1端子の間の電圧である。特に、VGS=ΔVDATA+Vth-VOLEDであり、ここで、VOLEDは、OLED上の電圧降下(又は、前記OLEDの第2端子に接地電圧レベルが提供されると仮定して、簡単にOLEDのアノード電圧と称する)である。従って、下記の式(2)が得られる。
IOLED=K(ΔVDATA-VOLED)2 式(2)
Claims (14)
- 第1期間と、第2期間と、第3期間と、第4期間とを含む駆動周期内で、表示装置におけるタッチ制御ピクセル駆動回路を駆動する方法であって、
前記タッチ制御ピクセル駆動回路は、
データ線及び読み取り線に接続される駆動トランジスタと、
前記駆動トランジスタ及び前記読み取り線に接続される第1電極と、基準電圧端子に接続される第2電極とを有する有機発光ダイオード(OLED)と、
前記データ線及び前記読み取り線に接続され、第1制御信号及び第2制御信号によりリセットされて、前記データ線における高レベル電圧に基づいて生信号を前記読み取り線に送信し、タッチによる前記生信号の変化に応じた感知信号を発生し、前記感知信号を前記読み取り線に送信するための感光タッチサブ回路と、
前記駆動トランジスタに接続され、電源端子からの電源電圧及び前記第1制御信号、前記第2制御信号及び第3制御信号により制御される前記データ線からのデータ信号を利用して前記駆動トランジスタを充電及び放電し、前記OLEDを駆動して発光させるための駆動サブ回路と
を含み、
前記方法は、
前記第1期間で、前記第1制御信号に基づいて前記感光タッチサブ回路をリセットして、更に前記第2制御信号に基づいて、電源電圧を前記駆動トランジスタの制御端子に充電するステップと、
前記第2期間で、前記第1制御信号を保ちながら、前記駆動トランジスタの制御端子を放電して、前記感光タッチサブ回路の前記第1期間と同一の状態を維持するステップと、
前記第3期間で、光信号を感知し、当該光信号を電流信号に変換させ、データ信号を前記第3制御信号により制御される前記駆動トランジスタの制御端子に書き込むステップと、
前記第4期間で、前記電流信号を前記読み取り線に伝送し、前記第2制御信号を利用して、前記駆動トランジスタを通じて駆動電流を制御して前記OLEDを発光させるステップと
を含み、
前記第2制御信号及び前記第3制御信号は、前記第1期間、前記第2期間、前記第3期間及び前記第4期間のうち同一の期間において同一の電圧レベルを有し、
前記感光タッチサブ回路は、
フォトトランジスタと、
前記フォトトランジスタ及び前記データ線に接続され、前記第1制御信号を受信するためのリセットサブサブ回路と、
前記フォトトランジスタ及び前記読み取り線に接続され、前記第2制御信号を受信するための伝送サブサブ回路と、
前記フォトトランジスタに接続され、光信号を感知する前記フォトトランジスタにより変換された電流信号を記憶するための記憶サブサブ回路と
を含み、
前記駆動サブ回路は、充電器サブサブ回路と、レギュレータサブサブ回路とを含み、
前記リセットサブサブ回路は、前記第1制御信号が提供される制御端子と、前記データ線に接続される第1端子と、前記フォトトランジスタの制御端子及び第2端子に接続される第2端子とを有する第1トランジスタを含み、
前記伝送サブサブ回路は、前記第2制御信号が提供される制御端子と、前記フォトトランジスタの第1端子に接続される第1端子と、前記読み取り線に接続される第2端子とを有する第2トランジスタを含み、
前記充電器サブサブ回路は、
前記第2制御信号が提供される制御端子と、前記電源端子に接続される第1端子と、前記駆動トランジスタの第1端子に接続される第2端子とを有する第3トランジスタと、
前記第1制御信号が提供される制御端子と、前記第3トランジスタの第2端子に接続される第1端子と、前記駆動トランジスタの制御端子に接続される第2端子とを有する第4トランジスタと、
前記第1制御信号が提供される制御端子と、前記駆動トランジスタの第2端子に接続される第1端子と、前記基準電圧端子に接続される第2端子とを有する第5トランジスタと
を含み、
前記レギュレータサブサブ回路は、第6トランジスタを含み、
前記第6トランジスタは、P型薄膜トランジスタとして提供され、前記駆動トランジスタ、前記フォトトランジスタ、前記第1トランジスタ、前記第2トランジスタ、前記第3トランジスタ、前記第4トランジスタ及び前記第5トランジスタの各々は、N型薄膜トランジスタとして提供され、
前記第1制御信号は、前記第1期間及び前記第2期間で高電圧レベルに設定され、前記第3期間及び前記第4期間で低電圧レベルに設定され、
前記第2制御信号及び前記第3制御信号は、両方とも、前記第1期間で前記高電圧レベルに設定され、前記第2期間及び前記第3期間で前記低電圧レベルに設定され、前記第4期間で前記高電圧レベルに設定されることを特徴とする方法。 - 前記第1制御信号は、リセット期間でターンオン信号を提供し、前記第1トランジスタが導通状態となるようにして、前記データ線からの高電圧レベルの初期データ信号が前記生信号として前記フォトトランジスタに渡されるようにするためであることを特徴とする請求項1に記載の方法。
- 前記フォトトランジスタは、外部光信号により照射される時、光電流信号を発生するためであり、前記光電流信号は、前記生信号の変化として前記生信号に追加されることを特徴とする請求項2に記載の方法。
- 前記第2制御信号は、ターンオン信号を提供し、前記第2トランジスタが導通状態となるようにして、前記生信号又は前記フォトトランジスタからの前記生信号の変化が前記読み取り線に渡されるようにするためであることを特徴とする請求項3に記載の方法。
- 前記記憶サブサブ回路は、前記フォトトランジスタの第1端子に接続される第1電極と、前記フォトトランジスタの制御端子に接続される第2電極とを有する第1キャパシタを含むことを特徴とする請求項1に記載の方法。
- 前記充電器サブサブ回路は、前記電源端子、前記駆動トランジスタ及び前記基準電圧端子に接続されるように構成され、前記第1制御信号及び前記第2制御信号を受信して、前記電源端子からの前記電源電圧により前記駆動トランジスタの充電又は放電を制御するためであり、
前記レギュレータサブサブ回路は、前記データ線及び前記駆動トランジスタと接続されるように構成され、前記第3制御信号を受信して、前記駆動トランジスタの制御端子における電圧レベルを調整するためであることを特徴とする請求項1に記載の方法。 - 前記充電器サブサブ回路は、更に、前記第2制御信号を受信して、前記駆動トランジスタが導通状態となるようにし、駆動電流を通過させて、前記OLEDを駆動して発光させるためであることを特徴とする請求項6に記載の方法。
- 前記レギュレータサブサブ回路は、第2キャパシタをさらに含み、
前記第6トランジスタは、前記第3制御信号が提供される制御端子と、前記データ線に接続される第1端子と、前記第2キャパシタの第1電極に接続される第2端子とを有し、
前記第2キャパシタは、前記駆動トランジスタの制御端子に接続される第2電極を有することを特徴とする請求項6に記載の方法。 - 前記電源端子は、高電圧レベルの電源電圧を提供し、前記基準電圧端子は、低電圧レベルに接地されることを特徴とする請求項6に記載の方法。
- サブピクセル間領域により分かれるマトリクス配列に配置される複数のサブピクセル領域を有する表示領域を含むタッチ表示装置であって、
前記複数のサブピクセル領域の少なくとも一つのサブピクセルは、請求項1乃至9のいずれか一項のタッチ制御ピクセル駆動回路を駆動する方法の感光タッチサブ回路を含むことを特徴とするタッチ表示装置。 - 前記複数のサブピクセル領域の部分集合の各々は、前記感光タッチサブ回路を含み、前記複数のサブピクセル領域の部分集合は、前記表示領域内に周期的に配列されていることを特徴とする請求項10に記載のタッチ表示装置。
- 前記感光タッチサブ回路により感知される光信号から変換された光電流信号を処理して、前記表示領域でタッチが発生するか否かを判定し、前記タッチが判定される場合、前記表示領域における対応するタッチ位置を判定するための信号処理ブロックを更に含み、
前記タッチは、レーザー光線照射又は指タッチであることを特徴とする請求項10に記載のタッチ表示装置。 - 前記信号処理ブロックは、アンプと、プロセッサとを含み、
前記アンプは、前記感光タッチサブ回路に接続され、前記光電流信号を受信して、増幅された信号を発生し、
前記プロセッサは、前記アンプに接続され、前記増幅された信号と生信号の間の強度差と、非タッチ閾値とを比較し、前記強度差が前記非タッチ閾値より大きい場合、タッチの発生有り及び対応するタッチ位置を判定し、或いは、前記強度差が前記非タッチ閾値より小さい場合、タッチの発生が無いことを判定することを特徴とする請求項12に記載のタッチ表示装置。 - 前記タッチ位置は、第2制御信号が出力される制御線位置に基づくX座標及び前記光電流信号が収集される読み取り線に沿う前記感光タッチサブ回路の位置に基づくY座標を利用して判定されることを特徴とする請求項13に記載のタッチ表示装置。
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