JP2006293370A - アクティブマトリックス型ディスプレイ及び駆動方法 - Google Patents
アクティブマトリックス型ディスプレイ及び駆動方法 Download PDFInfo
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- G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
【解決手段】各配列は、行と列に配置される少なくとも1つの前記発光体、第1及び第2の電源出力端子を有する前記発光体に供給する少なくとも1つの電源、行に対して画素回路を選択できる少なくとも1つの回路、及び同時に1つの選択行の各画素回路に表示されるべき画像データを表す電位をアドレス指定できる少なくとも1つの回路を有する、ディスプレイ。
【選択図】図1
Description
電圧駆動電極及び2つの電流電極、つまり発光体の前記第1の電源入力端子と接続されるソース電極と称される電極、及び電源の前記第1の電源出力端子と接続されるドレイン電極と称される電極を有する、電圧制御型の電流変調トランジスター(Tr2)、
それぞれ駆動電極を設けられた、第1のスイッチTr1及び第2のスイッチTr3、並びに
画像の表示期間の間、駆動電圧を調整トランジスターTr2の前記駆動電極上に(特に第1のスイッチが閉じた時に)格納及び(特に第1のスイッチが開いた時に)維持できる記憶素子C1、
を有し、
データアドレス回路25は、画素の各列に、第1及び第2の列電極13及び12、前記第1の列電極13に接続される出力を有する差動増幅器2、前記第2の列電極12に接続される反転入力、及び前記画像データを表す電位をアドレス指定する非反転入力を有し、
前記第1の列電極13は、前記列の各画素回路の変調トランジスターの駆動電極に、画素回路の前記第1のスイッチTr1を経由して接続され、
前記第2の列電極12は、同じ画素回路のそれぞれの発光体1の前記第1の電源入力端子に同じ画素回路の前記第1のスイッチTr3を経由して接続され、そして
行選択回路は、画素の各行に、行の各画素回路10の第1のスイッチTr1及び第2のスイッチTr3の駆動電極に接続される少なくとも1つの行電極14を有する。
ここでkはトランジスター固有のパラメータに依存する定数である。
変調トランジスターTr2の電流電極の端子間の電位差Vds、及び
トランジスターTr2により変調された電流Idに依存する、発光体1の端子間の電位差Ve
に分けられる。
電圧駆動電極及び2つの電流電極、つまりソース電極と称される電極及び少なくとも1つの電源の前記第1の電源出力端子に接続されるドレイン電極と称される電極を有する電圧制御型の電流変調トランジスター、
それぞれ駆動電極を設けられた、第1のスイッチ及び第2のスイッチ、並びに
画像を表示する間、変調トランジスターの前記駆動電極に駆動電圧を充電及び維持できる記憶素子、
を有し、
少なくとも1つのデータアドレス回路は、画素の各列に、第1及び第2の列電極、前記第1の列電極に接続される出力を有する差動増幅器、前記第2の列電極に接続される反転入力、及び前記画像データを表す電位をアドレス指定する非反転入力を有し、
前記第1の列電極は、前記列の各画素回路の変調トランジスターの駆動電極に、画素回路の前記第1のスイッチにより接続でき、
前記第2の列電極は、それぞれ同じ画素回路の電流変調トランジスターの前記ソース電極に、画素回路の前記第2のスイッチにより接続でき、並びに
少なくとも1つの行選択回路は、画素の各行に、行の各画素回路の第1及び第2のスイッチの駆動電極に接続される少なくとも1つの行電極を有し、
少なくとも1つのデータアドレス回路は、画素の各列に、1つは前記列の前記第2の列電極に接続され、もう1つは少なくとも1つの電源の第2の電源出力端子に接続される、2つの端子を有する受動素子を有し、並びに
前記ディスプレイは、各画素回路の少なくとも1つの発光体を通じて、前記画素回路の電流変調トランジスターの前記ソース電極を、少なくとも1つの電源の第2の電源出力端子に接続できる、少なくとも1つの第3のスイッチを有する
ことを特徴とする、アクティブマトリックス型ディスプレイを提供する。
(2)各画素回路の2つのスイッチ(参照符号T2及びT5)は、別の行電極により制御される。従って行電極の追加の配列を必要とする。
(2)第3のスイッチが閉じられた時、電流Idを発生できる駆動電圧を蓄えている記憶素子が、これら発光体を、電源を供給されている回路に再び組み込むようにする。そして前記電流Idが、望ましくは同一の電源から流れるようにする。
(1)各画素回路で、少なくとも1つの発光体のアノードは、回路の変調トランジスターのソース電極と接続される。及び
(2)少なくとも1つの第3のスイッチは、各画素回路の少なくとも1つの発光体のカソードを、少なくとも1つの電源の第2の電源出力端子に接続できる。
ほぼ一定である電圧VDDを有する第1の出力端子、及びアース電極に接続される第2の出力端子を有する電源(図示されない)、
画素の各列に単一の行選択電極14を有する、何れか1つの行の画素回路10を選択できる回路(図示されない)、及び
何れか1つの選択された行の各画素回路に画像データを表す電位Vdataを同時にアドレス指定できる回路25、を有する。前記回路25は、画素の各列に、第1の列電極13及び第2の列電極12、差動増幅器2及び抵抗値R1の抵抗4を有する。差動増幅器2は、第1の列電極13に接続される出力、第2の列電極12に接続される反転入力、及び電極11を経由して前記画像データを表す電位をアドレス指定する非反転入力を有する。抵抗4の1つの端子は、差動増幅器2の反転入力に接続される。前記抵抗の他方の端子は、電源の第2の出力端子に、アース電極を経由して接続される。
各画素回路10はまた、変調トランジスターTr2のゲート電極gを第1の列電極13に接続できる第1のスイッチTr1、及び発光体1の第1の端子(アノード)及びトランジスターTr2のソース電極sを第2の列電極12に接続できる第2のスイッチTr3を有する。各スイッチTr1、Tr3は、行電極14に接続される駆動電極に接続される。
2 差動増幅器
4 抵抗
10 画素回路
11 電極
12 第2の列電極
13 第1の列電極
14 行選択電極
16 行電源電極
17 アース電極
18 発光体の単一層
19 駆動電極
25 アドレス回路
C1 記憶素子(コンデンサー)
g ゲート電極
Id 電流
s ソース電極
Tr1 第1のスイッチ
Tr2 電圧制御型の電流変調トランジスター
Tr3 第2のスイッチ
Tr4 第3のスイッチ
Vn 論理信号
Vdata 画像データを表す電位
Vgs ゲート−ソース間の電位差
Claims (11)
- アクティブマトリックス型ディスプレイであって、
電流制御可能な種類の発光体の配列、及び各画素回路が行と列に配される前記発光体の少なくとも1つを有する画素回路の配列、
第1及び第2の電源出力端子を有する、前記発光体に供給する少なくとも1つの電源、
画素回路を、何れか1つの行に対し、選択できる少なくとも1つの回路、
選択された何れか1つの行の各画素回路に、表示されるべき画像データを表す電位を同時にアドレス指定できる少なくとも1つの回路、
を有し、各画素回路は、少なくとも1つの発光体に加え、
電圧駆動電極並びに2つの電流電極、つまりソース電極と称される電極及び少なくとも1つの電源の前記第1の電源出力端子に接続されるドレイン電極と称される電極を有する、電圧制御型の電流変調トランジスター、
それぞれ駆動電極を設けられた、第1のスイッチ及び第2のスイッチ、並びに
画像の表示期間中、駆動電圧を変調トランジスターの前記駆動電極に充電及び維持できる記憶素子、
を有し、
少なくとも1つのデータアドレス回路は、画素の各列に、第1及び第2の列電極、前記第1の列電極に接続される出力及び前記第2の列電極に接続される反転入力及び画像データを表す前記電位をアドレス指定する非反転入力を有する差動増幅器、を有し、
前記第1の列電極は、前記列の各画素回路の変調トランジスターの駆動電極に、前記回路の前記第1のスイッチを用いて接続でき、
前記第2の列電極は、同一の各画素回路の電流変調トランジスターの前記ソース電極に、前記回路の前記第2のスイッチを用いて接続でき、並びに
少なくとも1つの行選択回路は、画素の各行に、前記行の各画素回路の第1及び第2のスイッチの駆動電極に接続される、少なくとも1つの行電極を有し、
少なくとも1つのデータアドレス回路は、画素の各列に、1つの端子は前記列の前記第2の列電極に接続され、もう1つの端子は少なくとも1つの電源の第2の電源出力端子に接続される、2つの端子を有する受動素子を有し、並びに
前記ディスプレイは、各画素回路の少なくとも1つの発光体を通じて、前記画素回路の電流変調トランジスターの前記ソース電極を、少なくとも1つの電源の第2の電源出力端子に接続できる、少なくとも1つの第3のスイッチを有する、
ことを特徴とする、アクティブマトリックス型ディスプレイ。 - 前記受動素子は抵抗であることを特徴とする、請求項1記載のディスプレイ。
- 各電流変調トランジスターはn型トランジスターであることを特徴とする、請求項2記載のディスプレイ。
- 前記発光体は有機発光ダイオードであることを特徴とする、請求項3記載のディスプレイ。
- 前記各ダイオードは、前記アクティブマトリックスに接する下部導電層により形成されるアノードと上部導電層により形成されるカソードの間に挿入される有機電子発光層を有することを特徴とする、請求項4記載のディスプレイ。
- 種々のダイオードのカソードは、全てのダイオードに共通の1つの同一の導電層を形成することを特徴とする、請求項5記載のディスプレイ。
- 各発光体は、2つの電源入力端子、つまりアノード及びカソードを有し、
各画素回路では、少なくとも1つの発光体のアノードは、前記回路の変調トランジスターのソース電極に接続され、及び
少なくとも1つの第3のスイッチは、各画素回路の少なくとも1つの発光体のカソードを、少なくとも1つの電源の第2の電源出力端子に接続できる
ことを特徴とする、前記請求項の何れか1つに記載のディスプレイ。 - 一連の画像フレームを表示するディスプレイ駆動方法であって、
各画像は、画像データのセットから成り、各データは、前記画像の画素及び前記画素の回路にアドレス指定されるべき表示電位に関連付けられ、
前記方法は、
表示する画像毎に、画素回路の少なくとも1つのセットを調整し、前記セットの各回路の記憶素子内で、前記回路の変調トランジスター及び前記回路に対するアドレス回路の受動素子を経由して、前記回路にアドレス指定された表示電位に比例する電流を生じさせる駆動電圧を充電する調整段階、並びに
前記セットの回路毎に、同一の駆動電圧が記憶素子により前記回路の変調トランジスターの駆動電極に維持され、前記回路の変調トランジスター及び前記画素回路の少なくとも1つの発光体を経由して、調整段階の間と同じ電流を生成する、前記セットの回路の発光体が発光する発光段階、
を有することを特徴とする、前記請求項の何れか1つに記載のディスプレイを駆動する方法。 - 前記セットの各画素回路の少なくとも1つの発光体を経由して、前記画素回路の電流変調トランジスターのソース電極を、少なくとも1つの電源の第2の電源出力端子に接続できる少なくとも1つの第3のスイッチは、各アドレス段階の間、開放され、及び、各発光段階の間、少なくとも1つの第3のスイッチは閉じられることを特徴とする、請求項8記載の駆動方法。
- 異なる行に属す画素回路のセットの各アドレス段階の間、画素回路の前記各異なる行は、少なくとも1つの選択回路を用い、連続して選択された各行の電極に、前記セットに属す前記行の各画素回路の第1及び第2のスイッチを閉じることができる論理信号を印加することにより選択されることを特徴とする、請求項9記載の駆動方法。
- 前記セットの画素回路の各行の前記選択の間、前記画素に対応する画像データを表す電位は、少なくとも1つのアドレス回路を用い、前記セットに属す前記行の各画素回路の演算増幅器の非反転入力に印加されることを特徴とする、請求項10記載の駆動方法。
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