JP2007058186A5 - - Google Patents

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JP2007058186A5
JP2007058186A5 JP2006196778A JP2006196778A JP2007058186A5 JP 2007058186 A5 JP2007058186 A5 JP 2007058186A5 JP 2006196778 A JP2006196778 A JP 2006196778A JP 2006196778 A JP2006196778 A JP 2006196778A JP 2007058186 A5 JP2007058186 A5 JP 2007058186A5
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average
display device
emitting element
light emitting
level
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JP2006196778A
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JP5352047B2 (en
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アナログビデオ信号をデジタルビデオ信号に変換するアナログデジタル変換回路と、
前記アナログデジタル変換回路に接続され、１フレームの平均階調レベルを計算する１フレーム平均階調計算回路と、
前記１フレーム平均階調計算回路に接続され、前記平均階調レベルに応じてサブフレーム数を増減させるサブフレーム数制御回路と、
前記平均階調レベルに応じて、発光素子の一対の電極間にかかる電圧を変える電位制御回路とを有することを特徴とする表示装置。 An analog-digital conversion circuit for converting an analog video signal into a digital video signal;
A one-frame average gradation calculation circuit connected to the analog-digital conversion circuit for calculating an average gradation level of one frame;
A subframe number control circuit connected to the one-frame average gradation calculation circuit and increasing or decreasing the number of subframes according to the average gradation level;
And a potential control circuit that changes a voltage applied between the pair of electrodes of the light-emitting element in accordance with the average gray level. 発光素子と、当該発光素子への電流の供給を制御する駆動用薄膜トランジスタと、スイッチング用薄膜トランジスタとを有する複数の画素が配置された表示部と、
１フレーム期間毎にビデオ信号を出力する信号線駆動回路と、
前記ビデオ信号を書き込む画素を選択する走査線駆動回路と、
前記発光素子に前記電流を供給する電源線と、
１フレームの平均階調レベルを計算する１フレーム平均階調計算回路と、
前記平均階調レベルに応じて、前記１フレーム期間におけるサブフレーム数を増減させるサブフレーム数制御回路と、
前記平均階調レベルに応じて、前記発光素子の一対の電極間にかかる電圧を変える電位制御回路とを有することを特徴とする表示装置。 A display portion in which a plurality of pixels each having a light emitting element, a driving thin film transistor that controls supply of current to the light emitting element, and a switching thin film transistor are disposed;
A signal line driving circuit for outputting a video signal every frame period;
A scanning line driving circuit for selecting pixels for writing the video signal;
A power line for supplying the current to the light emitting element;
A one-frame average gradation calculation circuit for calculating an average gradation level of one frame;
A subframe number control circuit for increasing or decreasing the number of subframes in the one frame period according to the average gray level;
A display device comprising: a potential control circuit that changes a voltage applied between the pair of electrodes of the light emitting element in accordance with the average gradation level. 請求項１又は請求項２において、前記平均階調レベルが所定の値よりも低くなったときに、前記サブフレーム数を減少させることを特徴とする表示装置。   3. The display device according to claim 1, wherein the number of subframes is reduced when the average gradation level becomes lower than a predetermined value. アナログビデオ信号をデジタルビデオ信号に変換するアナログデジタル変換回路と、
前記アナログデジタル変換回路に接続され、１フレームの平均階調レベルを計算する１フレーム平均階調計算回路と、
前記１フレーム平均階調計算回路に接続され、前記平均階調レベルに応じて、重ね合せ時間階調方式又は２進法デジタル時間階調方式に階調方式を変える重ね合せ時間階調方式／２進法デジタル時間階調方式変換回路と、
前記平均階調レベルに応じて、発光素子の一対の電極間にかかる電圧を変える電位制御回路とを有することを特徴とする表示装置。 An analog-digital conversion circuit for converting an analog video signal into a digital video signal;
A one-frame average gradation calculation circuit connected to the analog-digital conversion circuit for calculating an average gradation level of one frame;
Superimposition time gradation method / 2 connected to the one-frame average gradation calculation circuit and changing the gradation method to the superposition time gradation method or the binary digital time gradation method according to the average gradation level / 2 A decimal digital time gray scale conversion circuit;
And a potential control circuit that changes a voltage applied between the pair of electrodes of the light-emitting element in accordance with the average gray level. 発光素子と、当該発光素子への電流の供給を制御する駆動用薄膜トランジスタと、スイッチング用薄膜トランジスタとを有する複数の画素が配置された表示部と、
１フレーム期間毎にビデオ信号を出力する信号線駆動回路と、
前記ビデオ信号を書き込む画素を選択する走査線駆動回路と、
前記発光素子に前記電流を供給する電源線と、
１フレームの平均階調レベルを計算する１フレーム平均階調計算回路と、
前記平均階調レベルに応じて、重ね合せ時間階調方式又は２進法デジタル時間階調方式に階調方式を変える重ね合せ時間階調方式／２進法デジタル時間階調方式変換回路と、
前記平均階調レベルに応じて、前記発光素子の一対の電極間にかかる電圧を変える電位制御回路とを有することを特徴とする表示装置。 A display portion in which a plurality of pixels each having a light emitting element, a driving thin film transistor that controls supply of current to the light emitting element, and a switching thin film transistor are disposed;
A signal line driving circuit for outputting a video signal every frame period;
A scanning line driving circuit for selecting pixels for writing the video signal;
A power line for supplying the current to the light emitting element;
A one-frame average gradation calculation circuit for calculating an average gradation level of one frame;
A superposition time gray scale method / binary digital time gray scale conversion circuit that changes the gray scale method to a superposition time gray scale method or a binary digital time gray scale method according to the average gray level;
A display device comprising: a potential control circuit that changes a voltage applied between the pair of electrodes of the light emitting element in accordance with the average gradation level. 請求項４又は請求項５において、前記平均階調レベルが所定の値よりも低くなったときに、前記重ね合せ時間階調方式から前記２進法デジタル時間階調方式に変更することを特徴とする表示装置。   6. The method according to claim 4, wherein when the average gradation level becomes lower than a predetermined value, the superposition time gradation method is changed to the binary digital time gradation method. Display device. 請求項１乃至請求項６のいずれか一において、前記電位制御回路は、前記平均階調レベルが所定の値よりも高くなったときに、前記発光素子の一対の電極間にかかる電圧を低めることを特徴とする表示装置。   7. The voltage control circuit according to claim 1, wherein the potential control circuit reduces a voltage applied between the pair of electrodes of the light emitting element when the average gradation level becomes higher than a predetermined value. A display device. 請求項１乃至請求項７のいずれか一において、前記電位制御回路は、前記平均階調レベルが所定の値よりも低くなったときに、前記発光素子の一対の電極間にかかる電圧を高めることを特徴とする表示装置。   8. The voltage control circuit according to claim 1, wherein the potential control circuit increases a voltage applied between the pair of electrodes of the light emitting element when the average gradation level becomes lower than a predetermined value. A display device. 請求項１乃至請求項８のいずれか一に記載の表示装置と、操作キーとを備えた電子機器。 An electronic apparatus comprising the display device according to any one of claims 1 to 8 and an operation key . 表示装置に入力されたアナログビデオ信号をデジタルビデオ信号に変換し、
１フレームの平均階調レベルを計算し、
前記平均階調レベルに応じて、サブフレーム数を増減させ、
前記平均階調レベルに応じて、発光素子の一対の電極間にかかる電圧を変えることを特徴とする表示装置の駆動方法。 Convert the analog video signal input to the display device into a digital video signal,
Calculate the average gradation level of one frame,
Depending on the average gray level, the number of subframes is increased or decreased,
A driving method of a display device, wherein a voltage applied between a pair of electrodes of a light emitting element is changed in accordance with the average gradation level. 請求項１０において、前記平均階調レベルが所定の値よりも低い場合に、前記サブフレーム数を減少させることを特徴とする表示装置の駆動方法。   11. The display device driving method according to claim 10, wherein the number of subframes is decreased when the average gray level is lower than a predetermined value. 請求項１０において、前記平均階調レベルが所定の値よりも高い場合に、前記サブフレーム数を増大させることを特徴とする表示装置の駆動方法。   11. The display device driving method according to claim 10, wherein the number of subframes is increased when the average gray level is higher than a predetermined value. 表示装置に入力されたアナログビデオ信号をデジタルビデオ信号に変換し、
１フレームの平均階調レベルを計算し、
前記平均階調レベルに応じて、重ね合せ時間階調方式又は２進法デジタル時間階調方式に階調方式を変換し、
前記平均階調レベルに応じて、発光素子の一対の電極間にかかる電圧を変えることを特徴とする表示装置の駆動方法。 Convert the analog video signal input to the display device into a digital video signal,
Calculate the average gradation level of one frame,
According to the average gradation level, the gradation method is converted into a superposition time gradation method or a binary digital time gradation method,
A driving method of a display device, wherein a voltage applied between a pair of electrodes of a light emitting element is changed in accordance with the average gradation level. 請求項１３において、前記平均階調レベルが所定の値よりも低い場合に、前記重ね合せ時間階調方式から前記２進法デジタル時間階調方式に変換することを特徴とする表示装置の駆動方法。   14. The display device driving method according to claim 13, wherein when the average gray level is lower than a predetermined value, the superimposition time gray scale method is converted to the binary digital time gray scale method. . 請求項１３において、前記平均階調レベルが所定の値よりも高い場合に、前記２進法デジタル時間階調方式から前記重ね合せ時間階調方式に変換することを特徴とする表示装置の駆動方法。   14. The method of driving a display device according to claim 13, wherein when the average gray level is higher than a predetermined value, the binary digital time gray scale method is converted to the superposition time gray scale method. . 請求項１０乃至請求項１５のいずれか一において、前記平均階調レベルが所定の値よりも低い場合に、前記発光素子の一対の電極間にかかる電圧を高めることを特徴とする表示装置の駆動方法。   16. The display device driving according to claim 10, wherein a voltage applied between a pair of electrodes of the light emitting element is increased when the average gray level is lower than a predetermined value. Method. 請求項１０乃至請求項１５のいずれか一において、前記平均階調レベルが所定の値よりも高い場合に、前記発光素子の一対の電極間にかかる電圧を低めることを特徴とする表示装置の駆動方法。   16. The display device driving according to claim 10, wherein when the average gray level is higher than a predetermined value, a voltage applied between the pair of electrodes of the light emitting element is lowered. Method.
JP2006196778A 2005-07-27 2006-07-19 Display device and electronic device Expired - Fee Related JP5352047B2 (en)

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