JP6391401B2 - 画像表示装置 - Google Patents
画像表示装置 Download PDFInfo
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- JP6391401B2 JP6391401B2 JP2014204627A JP2014204627A JP6391401B2 JP 6391401 B2 JP6391401 B2 JP 6391401B2 JP 2014204627 A JP2014204627 A JP 2014204627A JP 2014204627 A JP2014204627 A JP 2014204627A JP 6391401 B2 JP6391401 B2 JP 6391401B2
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- light
- electrode
- emitting layer
- light emitting
- pixel
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Images
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- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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- 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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- 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
- H05B33/145—Arrangements of the electroluminescent material
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/115—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H10K59/123—Connection of the pixel electrodes to the thin film transistors [TFT]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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- Condensed Matter Physics & Semiconductors (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- Optics & Photonics (AREA)
- Geometry (AREA)
- Electroluminescent Light Sources (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
本実施形態は、複数の発光層を縦方向(垂直方向)に積層した構成を有する発光素子及び当該発光素子で画素を構成した画像表示装置の一態様について示す。
図1は、本発明の一実施形態に係る画像表示装置の画素を構成する発光素子102aの構成を示す。発光素子102aは、複数の発光層が設けられている。複数の発光層のそれぞれは、電極に挟まれている。図1で示す発光素子102aは、3つの電極によって2つの発光層が挟まれた構造を有している。具体的には、発光素子102aは、第1の発光層106が第1の電極104と第2の電極108に挟まれ、第2の発光層110が第2の電極108と第3の電極112に挟まれた構造を有している。第1の発光層106と第2の発光層110とは第2の電極108を挟んで積層されているので、第2の電極108は上下にある2つの発光層で共有されているとみなすこともできる。
図2は、本発明の一実施形態に係る画像表示装置100の一態様を示す。画像表示装置100は、画素126が配列して構成される画素部124を有し、これによって画像表示画面が設けられている。素子基板116には、発光素子及びトランジスタなどによる能動素子によって画素126が設けられており、画素部124の上面が封止材118によって覆われている。素子基板116には、画素126の動作を制御する信号を出力するドライバ回路120が設けられていてもよい。また、素子基板116には、外部回路と接続するためのフレキシブルプリント配線基板122が取り付けられていてもよい。
図3及び図4を参照して、本実施形態に係る画像表示装置の画素部の構成を示す。なお、本実施形態において画素は複数の副画素によって構成されているものとする。
本実施形態は、第1の実施形態で説明した副画素において、第3の電極も副画素ごとに電位を制御することのできる構成について、図6及び図7を参照して説明する。
図6は、一つ画素126bが、第1の副画素127b、第2の副画素128b、第3の副画素129bにより構成されている態様を示す。例えば、第1の副画素127bを赤色に対応する副画素、第2の副画素128bを緑色に対応する副画素、第3の副画素129bを青色に対応する副画素とすることができる。副画素はこれらの色に対応するものだけでなく、前述する色の中間色に対応する副画素や、白色に対応する副画素を追加が追加されて一つの画素が構成されてもよい。このように一つの画素を発光色の異なる複数の副画素で構成することによりカラー表示をすることができる。
本実施形態は、複数の発光層を横方向(水平方向)に配置した構成を有する発光素子及び当該発光素子で画素を構成した画像表示装置の一態様について示す。
図9は、本発明の一実施形態に係る画像表示装置の画素を構成する発光素子102cの構成を示す。発光素子102cは、複数の発光層を有し、これらが一対の電極間に設けられている。すなわち、図9で示すように、第1の発光層106と第2の発光層110は並置され、共に第1の電極105と第2の電極109に挟まれている。第1の発光層106と第2の発光層110とは並置され、共に第1の電極105と第2の電極109によって挟まれているので、2つの発光セルが並列に接続されているとみなすこともできる。
図10及び図11を参照して、本実施形態に係る画像表示装置の画素部の構成を示す。本実施形態も、他の実施形態と同様に、画素は複数の副画素によって構成されているものとする。
本実施形態は、複数の発光層を横方向(水平方向)に配置すると共に、各発光層による発光を個別に制御することができる構成を有する発光素子及び当該発光素子で画素を構成した画像表示装置の一態様について示す。
図13は、本発明の一実施形態に係る画像表示装置の画素を構成する発光素子102dの構成を示す。発光素子102dは、第1の発光層106が第1の電極105と第2の電極109との間に設けられ、第2の発光層110が第3の電極113と第2の電極109との間に設けられている。すなわち、発光素子102dは、第2の電極109を共通とし、第1の電極105が第1の発光層106に対応し、第3の電極113が第2の発光層110に対応して設けられている。
図14及び図15を参照して、本実施形態に係る画像表示装置の画素部の構成を示す。本実施形態も、他の実施形態と同様に、画素は複数の副画素によって構成されているものとする。
3の実施形態と同様の効果を得ることができる。なお、個別電極に対応する発光部分の発光強度については、図示しないが、個別電極に印加する電位を固定し、適切な回路を用いて、発光時間の長短を制御することでも調整することができる。
Claims (10)
- 複数の副画素で一つの画素が構成され、前記画素が2次元に配列した画素領域を有し、
前記複数の副画素の少なくとも一つは、複数の発光層が並置されており、
前記複数の発光層は、それぞれが量子ドット材料を含んで構成され、かつ発光波長のピーク位置が互いに異なることを特徴とする画像表示装置。 - 前記画素は、赤色に対応する第1の副画素と、緑色に対応する第2の副画素と、青色に対応する第3の副画素を含み、
前記第1の副画素と前記第2の副画素は前記発光層の上方にカラーフィルタが設けられ、
前記第3の副画素にはカラーフィルタが設けられていないことを特徴とする請求項1に記載の画像表示装置。 - 前記複数の副画素は、前記複数の発光層が並置されている第1の副画素と、量子ドット材料を含む発光層を1つ備えた第2の副画素とを含むことを特徴とする請求項1に記載の画像表示装置。
- 前記第2の副画素は、青色の発光をし、且つカラーフィルタが設けられていないことを特徴とする請求項3に記載の画像表示装置。
- 前記副画素は、第1の電極と第2の電極との間に、第1の発光層及び第2の発光層が並置され、
前記第1の電極は、第1のトランジスタのソース・ドレイン電極に接続し、
前記第2の電極は、前記複数の副画素に跨って配置され、共通電位が印加されていることを特徴とする請求項1に記載の画像表示装置。 - 前記第1の電極は光反射面を有し、前記第2の電極は透光性を有することを特徴とする請求項5に記載の画像表示装置。
- 前記副画素は、第1の電極と第2の電極との間に設けられた第1の発光層と、第3の電極と前記第2の電極との間に設けられた第2の発光層とを有することを特徴とする請求項1に記載の画像表示装置。
- 前記第1の電極及び前記第3の電極は光反射面を有し、前記第2の電極は透光性を有することを特徴とする請求項7に記載の画像表示装置。
- 前記第1の電極、前記第2の電極及び前記第3の電極のぞれぞれは、個別に電位が制御されることを特徴とする請求項7に記載の画像表示装置。
- 前記第1の電極は、第1のトランジスタのソース・ドレイン電極に接続し、
前記第3の電極は、第2のトランジスタのソース・ドレイン電極に接続し、
前記第1のトランジスタのゲート電極には、第1の映像信号線から供給される第1の映像信号が入力され、
前記第2のトランジスタのゲート電極には、第2の映像信号線から供給される第2の映像信号が入力されることを特徴とする請求項7に記載の画像表示装置。
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