JP2003122305A - Organic el display device and its control method - Google Patents
Organic el display device and its control methodInfo
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- JP2003122305A JP2003122305A JP2001312321A JP2001312321A JP2003122305A JP 2003122305 A JP2003122305 A JP 2003122305A JP 2001312321 A JP2001312321 A JP 2001312321A JP 2001312321 A JP2001312321 A JP 2001312321A JP 2003122305 A JP2003122305 A JP 2003122305A
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- organic
- light emitting
- display device
- current value
- pixel
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、各発光画素の発光
素子（電気光学素子）として、有機材料のエレクトロル
ミネッセンス(以下、有機ＥＬ(electroluminescence)と
記す)素子を用いた有機ＥＬ表示装置およびその制御方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic EL display device using an electroluminescence (hereinafter referred to as organic EL) element of an organic material as a light emitting element (electro-optical element) of each light emitting pixel, and a device thereof. Regarding control method.
【０００２】[0002]
【従来の技術】有機ＥＬ素子は、有機材料を陽極・陰極
の２つの電極で挟み込む構造を持ち、電極間に電圧が印
加されることにより、陰極から電子が、陽極から正孔が
有機層に注入され、電子・正孔が再結合することによっ
て発光するものであり、１０Ｖ以下の駆動電圧で、数１
００〜数１００００ｃｄ／ｍ2の輝度を得ることができ
る。したがって、この有機ＥＬ素子を画素の発光素子と
して用いた有機ＥＬ表示装置は、次世代のフラットパネ
ルディスプレイとして有望視されている。2. Description of the Related Art An organic EL element has a structure in which an organic material is sandwiched between two electrodes, an anode and a cathode. When a voltage is applied between the electrodes, electrons are emitted from the cathode and holes are emitted from the anode to the organic layer. It is injected and emits light when electrons and holes are recombined. When the driving voltage is 10 V or less,
A brightness of 00 to several 10,000 cd / m 2 can be obtained. Therefore, an organic EL display device using this organic EL element as a light emitting element of a pixel is regarded as a promising next-generation flat panel display.
【０００３】有機ＥＬ表示装置の駆動方式としては、単
純（パッシブ）マトリクス方式とアクティブマトリクス
方式とが挙げられる。ディスプレイの大型化・高精細化
を実現するには、単純マトリクス方式の場合は、各画素
の発光期間が走査線（即ち、垂直方向の画素数）の増加
によって減少するため、瞬間的に各画素の有機ＥＬ素子
が高輝度で発光することが要求される。一方、アクティ
ブマトリクス方式の場合は、各画素が１フレームの期間
に亘って発光を持続するため、ディスプレイの大型化・
高精細化が容易である。Drive systems for organic EL display devices include a simple (passive) matrix system and an active matrix system. In the case of the simple matrix method, the light emitting period of each pixel is reduced by the increase of the scanning line (that is, the number of pixels in the vertical direction) in order to realize the large size and high definition of the display. It is required that the organic EL device of (1) emits light with high brightness. On the other hand, in the case of the active matrix method, since each pixel continues to emit light for one frame period, the size of the display is increased.
High definition is easy.
【０００４】[0004]
【発明が解決しようとする課題】このアクティブマトリ
クス型有機ＥＬ表示装置においては、従来、発光画素の
駆動については入力信号（表示信号）レベルにかかわら
ず常に一定の条件で行っていた。そのため、高輝度化、
高コントラスト化については有機ＥＬ素子の特性に依存
する割合が大きく、同様に低消費電力化についても有機
ＥＬ素子の特性に依存せざるを得なかった。しかも、高
輝度化のために有機ＥＬ素子に対して高い電圧を印加し
たり、あるいは大きい電流を流し続けると、有機ＥＬ素
子の特性が劣化する傾向にあり、さらに消費電力も増大
するという問題が発生する。In this active matrix type organic EL display device, conventionally, light emitting pixels are always driven under a constant condition regardless of the input signal (display signal) level. Therefore, high brightness,
The high contrast depends largely on the characteristics of the organic EL element, and similarly, the low power consumption must depend on the characteristics of the organic EL element. Moreover, when a high voltage is applied to the organic EL element or a large current is continuously applied to increase the brightness, the characteristics of the organic EL element tend to be deteriorated and the power consumption is increased. Occur.
【０００５】本発明は、上記課題に鑑みてなされたもの
であり、その目的とするところは、有機ＥＬ素子の特性
に依存することなく、高コントラスト化および低消費電
力化が可能な有機ＥＬ表示装置およびその制御方法を提
供することにある。The present invention has been made in view of the above problems, and an object thereof is an organic EL display capable of achieving high contrast and low power consumption without depending on the characteristics of the organic EL element. An object is to provide an apparatus and a control method thereof.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明では、発光画素（有機ＥＬ素子）が行列状
に配置されてなる有機ＥＬ表示装置において、発光画素
に流れる電流値を検出し、その検出した電流値に基づい
て発光画素の発光時間を制御する構成を採っている。To achieve the above object, in the present invention, in an organic EL display device in which light emitting pixels (organic EL elements) are arranged in a matrix, the current value flowing in the light emitting pixels is A configuration is adopted in which the light emission time of the light emitting pixel is controlled based on the detected current value.
【０００７】発光画素に流れる電流に基づく発光時間の
制御において、検出した電流値が大きいときには、発光
画素の発光時間を短く設定することで、画面全体の発光
輝度および消費電力が抑制される。一方、検出した電流
値が小さいときには、発光画素の発光時間を長く設定す
ることで、高輝度化が図られる。In the control of the light emission time based on the current flowing through the light emitting pixel, when the detected current value is large, the light emission time of the light emitting pixel is set to be short to suppress the light emission brightness of the entire screen and the power consumption. On the other hand, when the detected current value is small, the brightness is increased by setting the light emission time of the light emitting pixel to be long.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照して詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
【０００９】［第１実施形態］図1は、本発明の第１実
施形態に係る有機ＥＬ表示装置を示す概略構成図であ
り、モノクロ方式の有機ＥＬ表示装置に適用した場合を
例に採って示している。ここでは、図面の簡略化のため
に、６行３７列の画素配列の場合を例に採って示してい
る。[First Embodiment] FIG. 1 is a schematic configuration diagram showing an organic EL display device according to a first embodiment of the present invention, and is applied to a monochrome type organic EL display device as an example. Shows. Here, for simplification of the drawing, a case of a pixel array of 6 rows and 37 columns is shown as an example.
【００１０】図１において、有機ＥＬパネル１１は、透
明ガラスなどの基板上に有機ＥＬ素子１２が行列状に多
数配された構成となっている。具体的には、基板上に、
透明導電膜からなる第１の電極（例えば、陽極）が形成
され、その上にさらに正孔輸送層、発光層、電子輸送層
および電子注入層が順次堆積されることで有機層が形成
され、この有機層上にさらに低仕事関数の金属からなる
第２の電極（例えば、陰極）が形成されることで有機Ｅ
Ｌ素子１２が形成されている。In FIG. 1, an organic EL panel 11 has a structure in which a large number of organic EL elements 12 are arranged in a matrix on a substrate such as transparent glass. Specifically, on the substrate,
A first electrode (for example, an anode) made of a transparent conductive film is formed, and a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer are sequentially deposited on the first electrode to form an organic layer, A second electrode (for example, a cathode) made of a metal having a low work function is further formed on this organic layer to form an organic E
The L element 12 is formed.
【００１１】この有機ＥＬ素子１２において、第１の電
極と第２の電極との間に直流電圧を印加することによ
り、正孔が第１の電極（陽極）から正孔輸送層を経て、
電子が第２の電極（陰極）から電子輸送層を経てそれぞ
れ発光層内に注入され、この注入された正負のキャリア
によって発光層内の蛍光分子が励起状態となり、この励
起分子の緩和過程で発光が得られるようになっている。In this organic EL element 12, by applying a DC voltage between the first electrode and the second electrode, holes pass from the first electrode (anode) through the hole transport layer,
Electrons are injected into the light emitting layer from the second electrode (cathode) via the electron transport layer, and the injected positive and negative carriers cause the fluorescent molecules in the light emitting layer to be in an excited state and emit light in the relaxation process of the excited molecules. Is obtained.
【００１２】有機ＥＬ素子１２を含む画素回路におい
て、有機ＥＬ素子１２を駆動する能動素子として、一般
的に、薄膜トランジスタ(Thin Film Transistor;ＴＦ
Ｔ)が用いられる。画素回路は、通常、ＴＦＴを複数個
有するとともに、画素情報（輝度情報）を保持するキャ
パシタを有する構成となっている。ただし、ここでは、
図面の簡略化のために、画素回路として、有機ＥＬ素子
１２に対して直列に接続されて当該素子を駆動するため
のＴＦＴ１３のみを代表して示している。In a pixel circuit including the organic EL element 12, a thin film transistor (TF) is generally used as an active element for driving the organic EL element 12.
T) is used. A pixel circuit usually has a plurality of TFTs and a capacitor for holding pixel information (luminance information). However, here
For simplification of the drawing, as a pixel circuit, only the TFT 13 connected in series to the organic EL element 12 to drive the element is shown as a representative.
【００１３】有機ＥＬ素子１２には、ＴＦＴ１３を通し
て駆動電圧が選択的に与えられることによって当該素子
の駆動が行われる。ここで、有機ＥＬ素子１２が例えば
流れる電流によって輝度が変化する構成の素子であると
すると、各画素の有機ＥＬ素子１２に流れる電流は、各
画素の輝度情報に応じて図示せぬＴＦＴによって制御さ
れることになる。A drive voltage is selectively applied to the organic EL element 12 through the TFT 13 to drive the element. Here, assuming that the organic EL element 12 is an element having a structure in which the brightness changes depending on the flowing current, the current flowing through the organic EL element 12 of each pixel is controlled by a TFT (not shown) according to the brightness information of each pixel. Will be done.
【００１４】有機ＥＬ素子１２の一端（本例では、カソ
ード）は全画素共通に接続され、さらに電流検出回路１
４の入力端に接続されている。電流検出回路１４は、全
画素に流れる電流を映像信号の垂直周期、即ち１フィー
ルド期間に亘って検出し、その検出した電流値を電流−
電圧変換回路１５に供給する。電流−電圧変換回路１５
は、電流検出回路１４で検出された電流値を電圧値に変
換し、その電圧値の検出電圧Ｖｄｅｔを比較器１６に供
給する。One end (cathode in this example) of the organic EL element 12 is connected commonly to all pixels, and further the current detection circuit 1
4 is connected to the input end. The current detection circuit 14 detects the current flowing through all pixels over the vertical period of the video signal, that is, for one field period, and the detected current value is the current −
It is supplied to the voltage conversion circuit 15. Current-voltage conversion circuit 15
Converts the current value detected by the current detection circuit 14 into a voltage value, and supplies the detected voltage Vdet of the voltage value to the comparator 16.
【００１５】比較器１６は、電流−電圧変換回路１５か
ら出力される検出電圧Ｖｄｅｔを基準電圧Ｖｒｅｆと比
較し、例えば、検出電圧Ｖｄｅｔが基準電圧Ｖｒｅｆよ
りも高いときに高レベル、検出電圧Ｖｄｅｔが基準電圧
Ｖｒｅｆ以下のときに低レベルの比較結果（デジタル信
号）を出力し、デューティ制御回路１７に供給する。デ
ューティ制御回路１７は、比較器１６の比較結果が高レ
ベルのときは有機ＥＬ素子１２の発光時間を短く設定
し、当該比較結果が低レベルのときは発光時間を長く設
定するようにＴＦＴ１３を駆動する。The comparator 16 compares the detection voltage Vdet output from the current-voltage conversion circuit 15 with the reference voltage Vref. For example, when the detection voltage Vdet is higher than the reference voltage Vref, the detection voltage Vdet is at a high level. When the voltage is equal to or lower than the reference voltage Vref, a low-level comparison result (digital signal) is output and supplied to the duty control circuit 17. The duty control circuit 17 drives the TFT 13 so that the light emission time of the organic EL element 12 is set to be short when the comparison result of the comparator 16 is high level and the light emission time is set to be long when the comparison result is low level. To do.
【００１６】次に、上記構成の第１実施形態に係る有機
ＥＬ表示装置の動作について、図２および図３の各波形
図を用いて説明する。なお、図２は、１フィールドにお
ける映像信号と基準電圧Ｖｒｅｆとの関係を示す波形図
である。また、図３は、１フィールドにおけるデューテ
ィ制御による発光期間−非発光期間の関係を示す波形図
である。Next, the operation of the organic EL display device according to the first embodiment having the above structure will be described with reference to the waveform diagrams of FIGS. 2 and 3. 2 is a waveform diagram showing the relationship between the video signal and the reference voltage Vref in one field. Further, FIG. 3 is a waveform diagram showing the relationship between the light emission period and the non-light emission period by duty control in one field.
【００１７】先ず、電流検出回路１４で全画素に流れる
電流値を１フィールド期間に亘って検出する。通常、映
像信号には垂直ブランキング区間が存在するため、入力
信号（表示信号）と全画素に流れる電流とを比較した場
合、この垂直ブランキング区間において電流は減少す
る。それ以外の部分については、入力信号および画素の
発光時間との関係に比例した出力が得られる。First, the current detection circuit 14 detects the value of the current flowing in all pixels over one field period. Normally, the video signal has a vertical blanking interval, and therefore, when the input signal (display signal) is compared with the current flowing in all pixels, the current decreases in this vertical blanking interval. For other parts, an output proportional to the relationship between the input signal and the light emission time of the pixel is obtained.
【００１８】電流検出回路１４で検出された電流値は、
電流−電圧変換回路１５で電圧値に変換されて比較器１
６に供給される。電流−電圧変換回路１５では、検出電
圧Ｖｄｅｔが入力信号に比例した成分と垂直ブランキン
グ区間の成分とを含んでいるため、それらの影響を考慮
して電圧変換を行うようにする。比較器１６では、任意
に設定した基準電圧Ｖｒｅｆと検出電圧Ｖｄｅｔとを比
較する。The current value detected by the current detection circuit 14 is
The current-voltage conversion circuit 15 converts the voltage value into a voltage value and the comparator 1
6 is supplied. In the current-voltage conversion circuit 15, the detection voltage Vdet includes a component proportional to the input signal and a component in the vertical blanking section, and therefore the voltage conversion is performed in consideration of these influences. The comparator 16 compares the arbitrarily set reference voltage Vref with the detection voltage Vdet.
【００１９】この比較において、比較器１６は例えば、
検出電圧Ｖｄｅｔが基準電圧Ｖｒｅｆよりも高いときに
高レベル、検出電圧Ｖｄｅｔが基準電圧Ｖｒｅｆ以下の
ときに低レベルのデジタル信号を出力し、デューティ制
御回路１７に供給する。これにより、以降、すべてデジ
タル処理となるため、アナログ的なバラツキや偏差など
を考慮する必要はない。In this comparison, the comparator 16 is, for example,
When the detection voltage Vdet is higher than the reference voltage Vref, a high level digital signal is output, and when the detection voltage Vdet is equal to or lower than the reference voltage Vref, a low level digital signal is output and supplied to the duty control circuit 17. As a result, since all digital processing is performed thereafter, it is not necessary to consider analog variations and deviations.
【００２０】デューティ制御回路１７は、比較器１６の
比較結果が高レベルのとき、即ち検出電圧Ｖｄｅｔが基
準電圧Ｖｒｅｆよりも高いときには、有機ＥＬ素子１２
の発光時間を短く設定することで、画面全体の発光輝度
および消費電力を抑制する。発光時間が短くなることに
より、一般的な動作状態における消費電力の削減が可能
となる。The duty control circuit 17 controls the organic EL element 12 when the comparison result of the comparator 16 is at a high level, that is, when the detection voltage Vdet is higher than the reference voltage Vref.
By setting the light emission time of to be short, the light emission brightness and power consumption of the entire screen are suppressed. By reducing the light emission time, it is possible to reduce the power consumption in a general operating state.
【００２１】一方、比較器１６の比較結果が低レベルの
とき、即ち検出電圧Ｖｄｅｔが基準電圧Ｖｒｅｆ以下の
ときには、有機ＥＬ素子１２の発光時間を長く設定する
ことで、高輝度化を図る。発光時間を長く設定すること
で、一般的な動作状態における最大輝度を大きくするこ
とが可能となる。On the other hand, when the comparison result of the comparator 16 is at a low level, that is, when the detection voltage Vdet is equal to or lower than the reference voltage Vref, the light emission time of the organic EL element 12 is set to be long, thereby achieving high brightness. By setting the light emission time to be long, it is possible to increase the maximum brightness in a general operation state.
【００２２】上述したように、有機ＥＬ素子１２を含む
発光画素が行列状に配置されてなるモノクロ方式の有機
ＥＬ表示装置において、画素領域の全画素の総電流値を
検出し、その検出した総電流値に基づく検出電圧Ｖｄｅ
ｔと基準電圧Ｖｒｅｆとの比較結果に応じて有機ＥＬ素
子１２の発光時間を制御するようにし、発光期間／非発
光期間を適宜組み合わせることにより、高コントラスト
化と低消費電力化という相反する条件を両立することが
可能となる。As described above, in the monochrome type organic EL display device in which the light emitting pixels including the organic EL elements 12 are arranged in a matrix, the total current value of all the pixels in the pixel area is detected, and the detected total value is detected. Detection voltage Vde based on current value
By controlling the light emission time of the organic EL element 12 according to the comparison result of t and the reference voltage Vref and appropriately combining the light emission period / non-light emission period, there are conflicting conditions of high contrast and low power consumption. It becomes possible to be compatible.
【００２３】すなわち、小面積を光らせるときには、発
光期間を長く設定し、高輝度で有機ＥＬ素子１２を発光
させることにより、コントラスト感のあるインパクトの
ある画像を表示できる。また、大面積の明るい画面にお
いては、輝度を抑制することにより、画質を損なうこと
なく、有機ＥＬ素子１２の発熱や駆動電流による有機Ｅ
Ｌ素子１２の劣化を抑制することができるため、本有機
ＥＬ表示装置の長寿命化が図れる。That is, when a small area is illuminated, the light emitting period is set to be long and the organic EL element 12 is caused to emit light with high brightness, so that an image having a high contrast and impact can be displayed. Further, in a bright screen having a large area, the brightness of the organic EL element 12 is suppressed by the heat generation and the driving current of the organic EL element 12 without impairing the image quality by suppressing the brightness.
Since the deterioration of the L element 12 can be suppressed, the life of the organic EL display device can be extended.
【００２４】また、基準電圧Ｖｒｅｆの設定により、最
大輝度と消費電力とのどちらを重要視するかを任意に選
択することができる。さらに、上記の制御においては、
有機ＥＬ素子１２の発光時間のみを制御するようにして
いるため、信号の階調表現に影響を与えることなく、入
力信号（表示信号）に応じた発光時間の最適な設定が可
能となる。Further, by setting the reference voltage Vref, it is possible to arbitrarily select which of the maximum brightness and the power consumption is to be emphasized. Furthermore, in the above control,
Since only the light emission time of the organic EL element 12 is controlled, it is possible to optimally set the light emission time according to the input signal (display signal) without affecting the gradation expression of the signal.
【００２５】なお、本実施形態においては、検出電圧Ｖ
ｄｅｔを比較器１６で単一の基準電圧Ｖｒｅｆと比較
し、その比較結果に基づいて有機ＥＬ素子１２の発光時
間を２段階に制御するとしたが、この２段階制御に限ら
れるものではなく、電圧値が異なる複数の基準電圧を用
意し、これら複数の基準電圧との比較結果に基づいて発
光時間を多段階に制御する構成を採ることも可能であ
る。In this embodiment, the detection voltage V
det is compared with a single reference voltage Vref by the comparator 16 and the light emission time of the organic EL element 12 is controlled in two steps based on the comparison result, but the invention is not limited to this two-step control, and the voltage is not limited to the two-step control. It is also possible to adopt a configuration in which a plurality of reference voltages having different values are prepared and the light emission time is controlled in multiple stages based on the result of comparison with the plurality of reference voltages.
【００２６】また、基準電圧Ｖｒｅｆの電圧値を可変と
し、入力信号に応じてその電圧値を切り替えるようにす
ることも可能である。一例として、テキスト表示と動画
表示とで基準電圧Ｖｒｅｆの電圧値を切り替えるように
することで、入力信号（表示する画像）に応じた最適な
表示を実現できる。It is also possible to make the voltage value of the reference voltage Vref variable and switch the voltage value according to the input signal. As an example, by switching the voltage value of the reference voltage Vref between the text display and the moving image display, it is possible to realize optimal display according to the input signal (image to be displayed).
【００２７】［第２実施形態］図４は、本発明の第２実
施形態に係るモノクロ方式の有機ＥＬ表示装置を示す概
略構成図であり、図中、図１と同等部分には同一符号を
付して示している。ここでは、図面の簡略化のために、
８行３７列の画素配列の場合を例に採って示している。[Second Embodiment] FIG. 4 is a schematic configuration diagram showing a monochrome type organic EL display device according to a second embodiment of the present invention. In the figure, the same parts as those in FIG. It is attached. Here, in order to simplify the drawing,
The case of a pixel array of 8 rows and 37 columns is shown as an example.
【００２８】本実施形態に係る有機ＥＬ表示装置では、
有機ＥＬ素子１２を含む発光画素が行列状に配置されて
なる画素領域を所定の領域単位で分割し、その分割した
領域毎に有機ＥＬ素子１２に流れる電流値を電流検出回
路１４で検出し、この検出した領域毎の電流値に基づい
てデューティ制御回路１７によって有機ＥＬ素子１２の
発光時間を制御する構成を採っている。In the organic EL display device according to this embodiment,
A pixel area in which light-emitting pixels including the organic EL element 12 are arranged in a matrix is divided into predetermined area units, and a current value flowing in the organic EL element 12 is detected by the current detection circuit 14 for each of the divided areas. The duty control circuit 17 controls the light emission time of the organic EL element 12 based on the detected current value for each area.
【００２９】具体的には、本例に係る８行３７列の画素
配列の画素領域において、１行毎に行単位で領域を８分
割し、その分割した領域毎に有機ＥＬ素子１２に流れる
電流値を電流検出回路１４で検出するようにしている。
ここでは、簡単のために、８行３７列の画素配列を例に
採っているが、実際の有機ＥＬ表示装置においては、さ
らに多数の画素配列となることから、所定数の行毎に行
単位で領域を８分割することになる。ただし、分割数は
８分割に限られるものではなく、任意に設定可能であ
る。Specifically, in the pixel region of the pixel array of 8 rows and 37 columns according to the present example, the region is divided into 8 for each row, and the current flowing through the organic EL element 12 for each of the divided regions. The value is detected by the current detection circuit 14.
Here, for simplification, a pixel array of 8 rows and 37 columns is taken as an example, but in an actual organic EL display device, since a larger number of pixel arrays are provided, a row unit is provided for each predetermined number of rows. The area is divided into eight. However, the number of divisions is not limited to eight, and can be set arbitrarily.
【００３０】分割した領域毎に電流検出回路１４で検出
した電流値は、その領域毎に順に電流−電圧変換回路１
５で電圧値に変換され、その領域毎の検出電圧Ｖｄｅｔ
が比較器１６で順に基準電圧Ｖｒｅｆと比較され、その
比較結果が領域単位で順次デューティ制御回路１７に供
給される。そして、比較器１６から順に供給される比較
結果に基づいて、デューティ制御回路１７により、有機
ＥＬ素子１２の発光時間の制御が行われる。The current value detected by the current detection circuit 14 for each of the divided areas is the current-voltage conversion circuit 1 for each area in order.
The voltage is converted into a voltage value in 5, and the detection voltage Vdet for each area
Are sequentially compared with the reference voltage Vref by the comparator 16, and the comparison result is sequentially supplied to the duty control circuit 17 in units of regions. Then, based on the comparison result sequentially supplied from the comparator 16, the duty control circuit 17 controls the light emission time of the organic EL element 12.
【００３１】次に、上記構成の第２実施形態に係る有機
ＥＬ表示装置の動作について、図５および図６の各波形
図を用いて説明する。なお、図５は、１フィールドにお
ける映像信号と基準電圧Ｖｒｅｆおよび検出データとの
関係を示す波形図である。また、図６は、１フィールド
におけるデューティ制御による発光期間−非発光期間の
関係を示す波形図である。Next, the operation of the organic EL display device according to the second embodiment having the above structure will be described with reference to the waveform diagrams of FIGS. 5 and 6. Note that FIG. 5 is a waveform diagram showing the relationship between the video signal in one field, the reference voltage Vref, and the detection data. FIG. 6 is a waveform diagram showing the relationship between the light emitting period and the non-light emitting period by duty control in one field.
【００３２】先ず、画素領域を８分割し、その分割した
領域毎に有機ＥＬ素子１２に流れる電流値を検出すると
いうことは、１画面（１フィールド）を８分割し、画素
電流を１画面当たり８回検出することを意味している。
具体的には、電流検出回路１４は、図５のサンプリング
パルスに同期して、分割した領域毎に有機ＥＬ素子１２
に流れる電流値（画素電流）を検出する。First, the pixel area is divided into eight, and the current value flowing through the organic EL element 12 is detected for each of the divided areas. That is, one screen (one field) is divided into eight, and the pixel current per screen is divided. It means to detect 8 times.
Specifically, the current detection circuit 14 synchronizes with the sampling pulse of FIG.
The current value (pixel current) flowing through is detected.
【００３３】以降、電流検出回路１４で検出した電流を
電流−電圧変換回路１５で電圧（検出電圧）Ｖｄｅｔに
変換し、この検出電圧Ｖｄｅｔを比較器１６で基準電圧
Ｖｒｅｆと比較する動作が、分割した領域単位で順に行
われる。なお、電流検出回路１４、電流−電圧変換回路
１５および比較器１６での処理動作は、基本的に、第１
実施形態の場合と同じである。そして、デューティ制御
回路１７において、比較器１６から順に供給される比較
結果に基づいて有機ＥＬ素子１２の発光時間の制御が行
われる。Thereafter, the operation of converting the current detected by the current detection circuit 14 into the voltage (detection voltage) Vdet by the current-voltage conversion circuit 15 and comparing this detection voltage Vdet with the reference voltage Vref by the comparator 16 is divided. It is sequentially performed in the unit of the area. The processing operation in the current detection circuit 14, the current-voltage conversion circuit 15 and the comparator 16 is basically the first operation.
This is the same as the case of the embodiment. Then, the duty control circuit 17 controls the light emission time of the organic EL element 12 based on the comparison result sequentially supplied from the comparator 16.
【００３４】上述したように、１画面を複数の領域に分
割し、その分割した各領域毎に画素電流を検出すること
により、１画面の全画素電流を検出するよりも検出時間
が短くなり、１画面をより細かくデューティ制御するこ
とが可能となるため、第１実施形態に係る作用効果に加
えて、画面の明るさに速やかに追従する制御を実現でき
るとともに、よりダイナミックな画像表示を実現でき
る、という作用効果が得られる。As described above, by dividing one screen into a plurality of areas and detecting the pixel current in each of the divided areas, the detection time becomes shorter than that in detecting all the pixel currents in one screen. Since it becomes possible to control the duty of one screen more finely, in addition to the effect of the first embodiment, it is possible to realize control that quickly follows the brightness of the screen and realize more dynamic image display. The effect of, is obtained.
【００３５】具体的な制御としては、例えば、検出した
８データすべてが基準電圧Ｖｒｅｆよりも高い場合、即
ち画面全体が明るい場合には、サンプリングした検出デ
ータがすべて高レベルとなる。このときは、制御ステッ
プ幅を大きくし、早く発光時間の下限値へ到達させるよ
うに制御を行う。As a specific control, for example, when all of the detected 8 data are higher than the reference voltage Vref, that is, when the entire screen is bright, all the sampled detection data are at the high level. At this time, the control step width is increased, and control is performed so that the lower limit value of the light emission time is quickly reached.
【００３６】ここで、制御ステップ幅について説明す
る。制御ステップ幅は、制御の分解能とも言える。垂直
走査周波数が例えば６０Ｈｚの場合、１フィールドは約
１６．６ｍｓであり、発光時間の上限と下限との差を５
０％とし、１％ステップ幅で制御とすると、全体が白の
画面から黒の画面に急に切り替わったときに制御にかか
る時間Ｔは、
Ｔ＝１６．６ｍｓ×５０＝８３０ｍｓ
となる。Here, the control step width will be described. The control step width can be said to be the control resolution. When the vertical scanning frequency is, for example, 60 Hz, one field is about 16.6 ms, and the difference between the upper and lower limits of the light emission time is 5
If 0% is set and control is performed in 1% step width, the time T required for control when the entire screen is suddenly switched to a black screen is T = 16.6 ms × 50 = 830 ms.
【００３７】本例の場合は、１画面につき８データで発
光時間の制御を行うため、発光時間の上限から下限への
制御にかかる時間は、約１００ｍｓ（≒８３０ｍｓ／
８）となる。したがって、ブラウン管のテレビジョンに
おけるビーム電流を制御することによる明るさ制御にか
かる時間がおよそ２００ｍｓであることと比較しても、
動画表示においてもまったく問題ない、即ち違和感を生
じさせないレベルにすることができる。In the case of this example, since the light emission time is controlled by 8 data per screen, the time required to control the light emission time from the upper limit to the lower limit is about 100 ms (≈830 ms /
8). Therefore, even if the time required for the brightness control by controlling the beam current in the television of the cathode ray tube is about 200 ms,
It can be set to a level at which there is no problem in displaying a moving image, that is, a feeling of strangeness does not occur.
【００３８】なお、本実施形態においては、発光画素が
行列状に配置されてなる画素領域を垂直方向において行
単位で分割するとしたが、垂直方向での分割に限られる
ものではなく、水平方向において列単位で分割したり、
垂直および水平の両方向において分割することも可能で
ある。In the present embodiment, the pixel area in which the light emitting pixels are arranged in a matrix is divided in the vertical direction on a row-by-row basis. However, the division is not limited to the vertical direction, but in the horizontal direction. You can divide by column,
It is also possible to split in both vertical and horizontal directions.
【００３９】［第３実施形態］図７は、本発明の第３実
施形態に係る有機ＥＬ表示装置を示す概略構成図であ
り、カラー方式の有機ＥＬ表示装置に適用した場合を例
に採って示している。[Third Embodiment] FIG. 7 is a schematic structural view showing an organic EL display device according to a third embodiment of the present invention, and is applied to a color type organic EL display device as an example. Shows.
【００４０】図７において、有機ＥＬパネル２１上に
は、Ｒ（赤）Ｇ（緑）Ｂ（青）の各有機ＥＬ素子２２
Ｒ，２２Ｇ，２２Ｂが各行毎に例えばＲＧＢの順に繰返
し配列されている。そして、有機ＥＬ素子２２Ｒ，２２
Ｇ，２２Ｂの各一端（本例では、カソード）が各色毎に
共通に接続され、さらに電流検出回路２４の３系統の各
入力端に接続されている。In FIG. 7, each organic EL element 22 of R (red) G (green) B (blue) is formed on the organic EL panel 21.
R, 22G, and 22B are repeatedly arranged in each row, for example, in the order of RGB. Then, the organic EL elements 22R, 22
One end of each of G and 22B (cathode in this example) is commonly connected for each color, and further connected to each of three input terminals of the current detection circuit 24.
【００４１】電流検出回路２４は、ＲＧＢの各色に対応
した回路部分を有し、各色毎に有機ＥＬ素子２２Ｒ，２
２Ｇ，２２Ｂに流れる電流値を１フィールド期間に亘っ
て検出し、その検出した電流値を電流−電圧変換回路２
５に供給する。電流−電圧変換回路２５は、ＲＧＢの各
色に対応した回路部分を有し、電流検出回路２４で検出
された各色毎の電流値を電圧値に変換し、その電圧値を
各色毎に比較器２６に供給する。The current detection circuit 24 has a circuit portion corresponding to each color of RGB, and the organic EL elements 22R and 2R are provided for each color.
The current value flowing in 2G and 22B is detected over one field period, and the detected current value is detected by the current-voltage conversion circuit 2
Supply to 5. The current-voltage conversion circuit 25 has a circuit portion corresponding to each color of RGB, converts the current value of each color detected by the current detection circuit 24 into a voltage value, and the voltage value is comparator 26 for each color. Supply to.
【００４２】比較器２６は、ＲＧＢの各色に対応した回
路部分を有し、電流−電圧変換回路２５から各色毎に出
力される検出電圧ＶｄｅｔＲ，ＶｄｅｔＧ，ＶｄｅｔＢ
を、例えば各色共通の基準電圧Ｖｒｅｆと比較し、例え
ば、検出電圧ＶｄｅｔＲ，ＶｄｅｔＧ，ＶｄｅｔＢが基
準電圧Ｖｒｅｆよりも高いときに高レベル、検出電圧Ｖ
ｄｅｔＲ，ＶｄｅｔＧ，ＶｄｅｔＢが基準電圧Ｖｒｅｆ
以下のときに低レベルの比較結果を各色毎に出力し、デ
ューティ制御回路２７に供給する。The comparator 26 has a circuit portion corresponding to each color of RGB, and the detection voltages VdetR, VdetG, VdetB output from the current-voltage conversion circuit 25 for each color.
Is compared with a reference voltage Vref common to each color, and, for example, when the detection voltages VdetR, VdetG, and VdetB are higher than the reference voltage Vref, the high level and the detection voltage Vref are detected.
detR, VdetG, and VdetB are reference voltages Vref
At the following times, a low-level comparison result is output for each color and supplied to the duty control circuit 27.
【００４３】デューティ制御回路２７は、ＲＧＢの各色
に対応した回路部分を有し、比較器２６の各色毎の比較
結果に基づいて、有機ＥＬ素子２２Ｒ，２２Ｇ，２２Ｂ
に対して直列に接続されたＴＦＴ２３Ｒ，２３Ｇ，２３
ＢをＯＮ／ＯＦＦ駆動することによって有機ＥＬ素子２
２Ｒ，２２Ｇ，２２Ｂの発光時間を制御する。具体的に
は、比較器２６の比較結果が高レベルのときは有機ＥＬ
素子２２Ｒ，２２Ｇ，２２Ｂの発光時間を短く設定し、
当該比較結果が低レベルのときは発光時間を長く設定す
るように、ＴＦＴ２３Ｒ，２３Ｇ，２３ＢをＯＮ／ＯＦ
Ｆ駆動する。The duty control circuit 27 has a circuit portion corresponding to each color of RGB, and based on the comparison result of each color of the comparator 26, the organic EL elements 22R, 22G, 22B.
TFTs 23R, 23G, 23 connected in series with respect to
Organic EL element 2 by driving B ON / OFF
It controls the light emission time of 2R, 22G, and 22B. Specifically, when the comparison result of the comparator 26 is at a high level, the organic EL
Set the light emission time of the elements 22R, 22G, 22B short,
When the comparison result is at a low level, the TFTs 23R, 23G, and 23B are turned on / off so that the light emission time is set to be long.
F drive.
【００４４】上述したように、カラー方式の有機ＥＬ表
示装置において、各色毎に有機ＥＬ素子２２Ｒ，２２
Ｇ，２２Ｂに流れる電流値を検出し、その色毎の検出電
流値に基づいて有機ＥＬ素子２２Ｒ，２２Ｇ，２２Ｂの
発光時間をＲＧＢ毎に制御するようにしたことにより、
第１実施形態に係る作用効果に加えて、ホワイトバラン
スに影響を与えることなく、入力信号に応じた最適な設
定が可能となる。ＲＧＢそれぞれの発光時間が異なる場
合には、一定の係数をかけることにより、ホワイトバラ
ンスに影響を与えないようにすることができる。As described above, in the color type organic EL display device, the organic EL elements 22R and 22R are provided for each color.
By detecting the current value flowing in G, 22B and controlling the light emission time of the organic EL elements 22R, 22G, 22B for each RGB based on the detected current value for each color,
In addition to the operational effects according to the first embodiment, it is possible to perform the optimum setting according to the input signal without affecting the white balance. When the emission times of RGB are different, it is possible to prevent the white balance from being affected by applying a constant coefficient.
【００４５】なお、本実施形態においては、ＲＧＢの各
色に対して共通の基準電圧Ｖｒｅｆを設定するとした
が、ＲＧＢの各色に対して別々の基準電圧を設定するよ
うにすることも可能である。In this embodiment, the common reference voltage Vref is set for each of the RGB colors, but it is also possible to set different reference voltages for each of the RGB colors.
【００４６】また、本実施形態では、有機ＥＬ素子２２
Ｒ，２２Ｇ，２２Ｂに流れる電流値を各色毎に検出する
としたが、有機ＥＬ素子２２Ｒ，２２Ｇ，２２Ｂに流れ
る全画素分の総電流値を検出し、この総電流値に基づい
て有機ＥＬ素子２２Ｒ，２２Ｇ，２２Ｂの発光時間をＲ
ＧＢ毎に制御するようにすることも可能である。In this embodiment, the organic EL element 22 is also used.
Although the current value flowing through R, 22G, 22B is detected for each color, the total current value for all pixels flowing through the organic EL elements 22R, 22G, 22B is detected, and the organic EL element 22R is detected based on this total current value. , 22G, 22B light emission time is R
It is also possible to control for each GB.
【００４７】[0047]
【発明の効果】以上説明したように、本発明によれば、
有機ＥＬ表示装置において、発光画素に流れる電流値を
検出し、その検出した電流値に基づいて発光画素の発光
時間を制御することにより、有機ＥＬ素子の特性に依存
することなく、高コントラスト化および低消費電力化が
可能となる。As described above, according to the present invention,
In an organic EL display device, by detecting a current value flowing in a light emitting pixel and controlling a light emitting time of the light emitting pixel based on the detected current value, a high contrast can be achieved without depending on the characteristics of the organic EL element. Low power consumption is possible.
【図１】本発明の第１実施形態に係る有機ＥＬ表示装置
を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing an organic EL display device according to a first embodiment of the present invention.
【図２】第１実施形態に係る１フィールドにおける映像
信号と基準電圧Ｖｒｅｆとの関係を示す波形図である。FIG. 2 is a waveform diagram showing a relationship between a video signal and a reference voltage Vref in one field according to the first embodiment.
【図３】第１実施形態に係る１フィールドにおけるデュ
ーティ制御による発光期間−非発光期間の関係を示す波
形図である。FIG. 3 is a waveform diagram showing a relationship between a light emitting period and a non-light emitting period by duty control in one field according to the first embodiment.
【図４】本発明の第２実施形態に係る有機ＥＬ表示装置
を示す概略構成図である。FIG. 4 is a schematic configuration diagram showing an organic EL display device according to a second embodiment of the present invention.
【図５】第２実施形態に係る１フィールドにおける映像
信号と基準電圧Ｖｒｅｆおよび検出データとの関係を示
す波形図である。FIG. 5 is a waveform diagram showing a relationship among a video signal, a reference voltage Vref, and detection data in one field according to the second embodiment.
【図６】第２実施形態に係る１フィールドにおけるデュ
ーティ制御による発光期間−非発光期間の関係を示す波
形図である。FIG. 6 is a waveform diagram showing a relationship between a light emitting period and a non-light emitting period by duty control in one field according to the second embodiment.
【図７】本発明の第３実施形態に係る有機ＥＬ表示装置
を示す概略構成図である。FIG. 7 is a schematic configuration diagram showing an organic EL display device according to a third embodiment of the invention.
１１，２１…有機ＥＬパネル、１２，２２Ｒ，２２Ｇ，
２２Ｂ…有機ＥＬ素子、１３，２３…ＴＦＴ（薄膜トラ
ンジスタ）、１４，２４…電流検出回路、１５，２５…
電流−電圧変換回路、１６，２６…比較器、１７，２７
…デューティ制御回路11, 21 ... Organic EL panel, 12, 22R, 22G,
22B ... Organic EL element, 13, 23 ... TFT (thin film transistor), 14, 24 ... Current detection circuit, 15, 25 ...
Current-voltage conversion circuit, 16, 26 ... Comparator, 17, 27
... Duty control circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０９Ｇ 3/20 Ｇ０９Ｇ 3/20 ６４２Ｐ Ｈ０５Ｂ 33/14 Ｈ０５Ｂ 33/14 Ａ Ｆターム(参考） 3K007 AB03 AB17 DB03 GA04 5C080 AA06 BB05 CC03 DD04 DD05 DD26 DD29 EE30 FF11 JJ02 JJ04 5C094 AA06 AA08 AA22 AA31 BA03 BA12 BA27 CA19 CA24 EA04 EA07 GA10 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) G09G 3/20 G09G 3/20 642P H05B 33/14 H05B 33/14 A F term (reference) 3K007 AB03 AB17 DB03 GA04 5C080 AA06 BB05 CC03 DD04 DD05 DD26 DD29 EE30 FF11 JJ02 JJ04 5C094 AA06 AA08 AA22 AA31 BA03 BA12 BA27 CA19 CA24 EA04 EA07 GA10
Claims (12)
手段と、 前記検出手段が検出した電流値に基づいて前記発光画素
の発光時間を制御する制御手段とを備えたことを特徴と
する有機ＥＬ表示装置。1. An organic display device comprising: a detection unit that detects a value of a current flowing through a light emitting pixel; and a control unit that controls a light emission time of the light emission pixel based on a current value detected by the detection unit. EL display device.
た電流値を基準値と比較する比較手段を有し、その比較
手段の比較結果に基づいて前記発光画素の発光時間を制
御することを特徴とする請求項１記載の有機ＥＬ表示装
置。2. The control means has a comparison means for comparing the current value detected by the detection means with a reference value, and controls the light emission time of the light emitting pixel based on the comparison result of the comparison means. The organic EL display device according to claim 1, which is characterized in that.
全画素分の総電流値を検出することを特徴とする請求項
１記載の有機ＥＬ表示装置。3. The organic EL display device according to claim 1, wherein the detection unit detects a total current value of all pixels flowing in the light emitting pixels.
に配されてなる画素領域を所定の領域単位で分割し、そ
の分割した領域毎に前記発光画素に流れる電流値を検出
することを特徴とする請求項１記載の有機ＥＬ表示装
置。4. The detection means divides a pixel area in which the light emitting pixels are arranged in a matrix into predetermined area units, and detects a current value flowing in the light emitting pixels in each of the divided areas. The organic EL display device according to claim 1, which is characterized in that.
（青）の各発光色に対応して設けられており、 前記検出手段は、ＲＧＢ毎に前記発光画素に流れる電流
値を検出し、 前記制御手段は、前記検出手段が検出したＲＧＢ毎の電
流値に基づいて前記発光画素の発光時間をＲＧＢ毎に制
御することを特徴とする請求項１記載の有機ＥＬ表示装
置。5. The light emitting pixels are R (red) G (green) B
It is provided corresponding to each emission color of (blue), the detection unit detects the current value flowing in the light emitting pixel for each RGB, and the control unit detects the current for each RGB detected by the detection unit. The organic EL display device according to claim 1, wherein the light emission time of the light emitting pixel is controlled for each of RGB based on the value.
（青）の各発光色に対応して設けられており、 前記検出手段は、前記発光画素に流れる全画素分の総電
流値を検出し、 前記制御手段は、前記検出手段が検出した総電流値に基
づいて前記発光画素の発光時間をＲＧＢ毎に制御するこ
とを特徴とする請求項１記載の有機ＥＬ表示装置。6. The light emitting pixels are R (red) G (green) B
It is provided corresponding to each emission color of (blue), the detection unit detects a total current value of all pixels flowing in the light emission pixel, and the control unit detects the total current detected by the detection unit. The organic EL display device according to claim 1, wherein the light emission time of the light emitting pixel is controlled for each of RGB based on the value.
御することを特徴とする有機ＥＬ表示装置の制御方法。7. A method of controlling an organic EL display device, which comprises detecting a value of a current flowing through a light emitting pixel and controlling a light emitting time of the light emitting pixel based on the detected current value.
比較結果に基づいて前記発光画素の発光時間を制御する
ことを特徴とする請求項７記載の有機ＥＬ表示装置の制
御方法。8. The method of controlling an organic EL display device according to claim 7, wherein the detected current value is compared with a reference value, and the light emission time of the light emitting pixel is controlled based on the comparison result.
値を検出することを特徴とする請求項７記載の有機ＥＬ
表示装置の制御方法。9. The organic EL device according to claim 7, wherein a total current value of all pixels flowing in the light emitting pixel is detected.
Display device control method.
画素領域を所定の領域単位で分割し、その分割した領域
毎に前記発光画素に流れる電流値を検出することを特徴
とする請求項７記載の有機ＥＬ表示装置の制御方法。10. The pixel region in which the light emitting pixels are arranged in a matrix is divided into predetermined region units, and the current value flowing in the light emitting pixels is detected for each of the divided regions. 7. The method for controlling the organic EL display device according to 7.
（青）の各発光色に対応して設けられており、 ＲＧＢ毎に前記発光画素に流れる電流値を検出し、 そのＲＧＢ毎の検出電流値に基づいて前記発光画素の発
光時間をＲＧＢ毎に制御することを特徴とする請求項７
記載の有機ＥＬ表示装置の制御方法。11. The light emitting pixel comprises R (red) G (green) B
It is provided for each emission color of (blue), detects the current value flowing in the light emitting pixel for each RGB, and based on the detected current value for each RGB, the light emission time of the light emitting pixel for each RGB. It controls, It is characterized by the above-mentioned.
A method for controlling the organic EL display device described.
（青）の各発光色に対応して設けられており、 前記発光画素に流れる全画素分の総電流値を検出し、 その検出総電流値に基づいて前記発光画素の発光時間を
ＲＧＢ毎に制御することを特徴とする請求項７記載の有
機ＥＬ表示装置の制御方法。12. The light emitting pixel comprises R (red) G (green) B
It is provided for each emission color of (blue), detects the total current value of all the pixels flowing in the light emitting pixel, and based on the detected total current value, the light emission time of the light emitting pixel for each RGB. The method for controlling an organic EL display device according to claim 7, wherein the method is controlled.
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