JPH10254410A - Organic electroluminescent display device, and driving method therefor - Google Patents

Organic electroluminescent display device, and driving method therefor

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Publication number
JPH10254410A
JPH10254410A JP7653397A JP7653397A JPH10254410A JP H10254410 A JPH10254410 A JP H10254410A JP 7653397 A JP7653397 A JP 7653397A JP 7653397 A JP7653397 A JP 7653397A JP H10254410 A JPH10254410 A JP H10254410A
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circuit
display
video
frame
stored
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Kunio Imai
邦男 今井
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Pioneer Electron Corp
パイオニア株式会社
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Abstract

PROBLEM TO BE SOLVED: To prevent the unevenness of luminance from occurring on a screen by variation of instantaneous luminances at every organic EL element by providing an arithmetic means calculating desired luminescent times in one frame duration while using current values stored in a storage means and luminance data inputted from the outside or the like. SOLUTION: An A/D conversion circuit 101 receives an analog video signal input to convert it into digital video signal data and the converted digital video signals are supplied to an arithmetic circuit 102 and are arithmetically processed by the control of a controller 104 based on data from a current value memory 108 to be write-stored a frame memory 103. Then, the display of a desired picture is obtained by sequentially controlling the write circuit 106 and the scanning circuit 105 connected to respective rows and columns of a display panel 109 with the controller 104 and by controlling luminescent times of the organic EL elements of the display panel 109 corresponding to the picture stored in the frame memory 103 by a subfield method, for example.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、有機エレクトロルミネッセンス(以下、有機ELと称する)表示装置及びその駆動方法に関する。 The present invention relates to an organic electroluminescent (hereinafter, referred to as organic EL) display device and a driving method thereof.

【0002】 [0002]

【従来の技術】従来、ガラス板、あるいは透明な有機フィルム上に形成した蛍光体に電流を流して発光させる有機EL素子が知られている。 Conventionally, a glass plate, or a transparent organic EL element to emit light by applying a current to a fluorescent material formed on the organic film is known. 図6に、かかる有機EL素子の概略構成を示す。 Figure 6 shows a schematic configuration of the organic EL element. 図6において、ガラス基板1の上面には透明電極2が形成されており、この透明電極2の上面には発光層3が形成されている。 6, the upper surface of the glass substrate 1 is formed with a transparent electrode 2, the light emitting layer 3 is formed on the upper surface of the transparent electrode 2. 更に、かかる発光層3の上面には金属電極4が形成されている。 Furthermore, the metal electrode 4 is formed on the upper surface of the light-emitting layer 3.

【0003】図7は、有機EL素子を等価的に表した電気回路図である。 [0003] Figure 7 is an electric circuit diagram showing the organic EL element equivalently. 一般に有機EL素子は図7に示されるが如く、回路抵抗成分Rと、容量成分Cと、発光成分D In general organic EL device as is shown in Figure 7, the circuit resistance component R, and the capacitance component C, emission component D
とにより等価的に表される、容量性の発光素子であると考えられている。 It is believed to be represented equivalently, a capacitive light emitting element by the.

【0004】従って、有機EL素子は、発光駆動電圧が印加されると、先ず、素子の電気容量に相当する電荷が電極に変位電流として流れ込み蓄積される。 [0004] Thus, the organic EL element, a light emission drive voltage is applied, first, electrical charges corresponding to the electric capacity of the element is accumulated flow into the electrode as a displacement current. 続いて一定の電圧(障壁電圧)を越えると、電極から有機層に電流が流れ始め、この電流に比例して発光が始まると考えられている。 Beyond followed by constant voltage (barrier voltage), current starts to flow into the organic layer from the electrodes, are believed to emission starts in proportion to the current.

【0005】さらに、複数の有機EL素子を用いた表示装置の例を図8を参照しつつ説明する。 [0005] Further, an example of a display device will be described with reference to FIG. 8 with a plurality of organic EL elements. このような表示装置は図8に示すように、陰極線走査回路51と陽極線ドライブ回路52と表示パネル(図示せず)とから構成される。 As shown in this display device 8, constructed from a cathode line scanning circuit 51 and the anode line drive circuit 52 display panel (not shown). 陰極線走査回路51と表示パネルとは接続部を構成する接続端子b 1 〜b nを介して接続され、陽極線ドライブ回路52と表示パネルとは同じく接続部を構成する接続端子a 1 〜a mを介して接続されている。 The display panel and the cathode line scan circuit 51 is connected via a connection terminal b 1 ~b n constituting the connecting portion, the connecting terminal a 1 constitutes also a connection to the anode line drive circuit 52 and the display panel ~a m It is connected via a.

【0006】図8の駆動方法は、単純マトリクス駆動方式と呼ばれるもので、陽極線A 1 〜A mと陰極線B 1 [0006] The driving method of FIG. 8 is called a simple matrix driving method, anode lines A 1 to A m and the cathode lines B 1 ~
nをマトリクス(格子)状に配置し、このマトリクス状に配置した陽極線と陰極線の各交点位置に有機EL素子E 1,1 〜E m,nを接続し、この陽極線または陰極線のいずれか一方を一定の時間間隔で順次選択して走査すると共に、この走査に同期して他方の線を駆動源たる電流源52 1 〜52 mでドライブしてやることにより、任意の交点位置の有機EL素子を発光させるようにしたものである。 Place the B n matrix (grid) shape, the organic EL element E 1, 1 to E m at each intersection of the anode lines and cathode lines arranged in the matrix, connecting the n, any of the anode lines or cathode lines or with one sequentially selected and scanned at regular time intervals, by'll be driven by synchronously other the line as a drive source a current source 52 1 to 52 m in the scanning, any intersection of the organic EL device it is obtained so as to emit light.

【0007】有機EL素子のドライブ法には、陰極線走査・陽極線ドライブ、陽極線走査・陰極線ドライブの2 [0007] The drive method of the organic EL element, cathode ray scanning and anode line drive, the anode line scanning and cathode ray drive 2
つの方法があるが、図8は、陰極線走査・陽極線ドライブの場合を示しており、陰極線B 1 〜B nに陰極線走査回路51を接続すると共に、陽極線A 1 〜A mに電流源52 1 〜52 mからなる陽極線ドライブ回路52を接続したものである。 One of a method, but FIG. 8 shows the case of a cathode line scanning and anode line drive, the connecting cathode line scanning circuit 51 to the cathode lines B 1 .about.B n, the current source to the anode lines A 1 to A m 52 it is obtained by connecting the anode line drive circuit 52 composed of 1 to 52 m. 陰極線走査回路51は、スイッチ53 Cathode line scan circuit 51, the switch 53
1 〜53 nを一定時間間隔で順次アース端子側へ切り換えながら走査していくことにより、陰極線B 1 〜B nに対してアース電位(0V)を順次与えていく。 By going scanned while switching sequentially to the ground terminal side 1 to 53 n at fixed time intervals, successively giving ground potential (0V) with respect to the cathode lines B 1 ~B n. また、陽極線ドライブ回路52は、前記陰極線走査回路51のスイッチ走査に同期してスイッチ54 1 〜54 mをオン・ Further, the anode line drive circuit 52 on the switch 54 1 through 54 m in synchronization with the switch scanning of the cathode line scanning circuit 51
オフ制御することにより陽極線A 1 〜A mに電流源52 Current source 52 to an anode line A 1 to A m by turning off control
1 〜52 mを接続し、所望の交点位置の有機EL素子に駆動電流を供給する。 Connect 1 to 52 m, and supplies the drive current to the organic EL element of the desired intersection.

【0008】例えば、有機EL素子E 2,1 〜E 3,1を発光させる場合を例に採ると、図示するように、陰極線走査回路51のスイッチ53 1がアース側に切り換えられ、第1の陰極線B 1にアース電位が与えられている時に、陽極線ドライブ回路52のスイッチ54 2と54 3 [0008] For example, when taking the case of the light-emitting organic EL element E 2,1 to E 3, 1 as an example, as shown, the switch 53 1 of the cathode line scan circuit 51 is switched to the ground side, a first when the ground potential is applied to the cathode line B 1, switch 54 2 and 54 3 of the anode line drive circuit 52
を電流源側に切り換え、陽極線A 2とA 3に電流源52 Switching the current source side, the current source 52 to the anode line A 2 and A 3
2と52 3を接続してやれば良い。 You may do it by connecting the 2 and 52 3. このような走査とドライブを高速で繰り返すことにより、任意の位置の有機EL素子を発光させると共に、各有機EL素子があたかも同時に発光しているように制御するものである。 By repeating such scanning and drive at high speed, in which together emit organic EL device of any position, and controls such that each organic EL element is as if at the same time light emission.

【0009】走査中の陰極線B 1以外の他の陰極線B 2 [0009] Other cathode ray other than the cathode line B 1 in the scanning B 2
〜B nには電源電圧と同電位の逆バイアス電圧Vccを印加してやることにより、誤発光を防止している。 The .about.B n by'll applying a reverse bias voltage Vcc of the power supply voltage and the same potential, thereby preventing the erroneous light emission. なお、前記図8では、駆動源として電流源52 1 〜52 m In FIG. 8, the current source 52 1 to 52 m as a drive source
を用いたが、電圧源を用いても同様に実現することができる。 Was used, it can be realized as well with a voltage source.

【0010】図4は、上述した構成の有機EL素子を用いた有機EL表示装置の構成を示すブロック図である。 [0010] Figure 4 is a block diagram showing a structure of an organic EL display device using an organic EL device having the above-described configuration.
図4において、101はA/D変換回路、103はフレームメモリ、104はコントローラ、105は走査回路、106は書き込み回路、107は電源回路、109 4, 101 A / D conversion circuit, 103 is a frame memory, 104 controller, 105 a scanning circuit, a write circuit 106, 107 is a power supply circuit, 109
は表示パネルを示す。 It shows the display panel.

【0011】A/D変換回路101は、アナログ映像信号入力を受けてデジタル映像信号データに変換する。 [0011] A / D conversion circuit 101 converts the digital video signal data receiving an analog video signal input. 変換されたデジタル映像信号はA/D変換回路101からフレームメモリ103へ供給され、コントローラ104 The converted digital video signal supplied from the A / D conversion circuit 101 to the frame memory 103, controller 104
の制御により書き込み蓄積される。 It is written accumulated by control of. コントローラ104 Controller 104
は、入力映像信号の水平及び垂直同期信号に同期してフレームメモリ103他電源回路107までの各回路を制御する。 Controls each circuit up to the frame memory 103, etc. Power circuit 107 in synchronism with the horizontal and vertical synchronizing signals of the input video signal.

【0012】フレームメモリ103に蓄積されたデジタル映像信号データは、コントローラ104によって読み出され、書き込み回路106に送られる。 [0012] Digital video signal data stored in the frame memory 103 is read by the controller 104 and sent to the write circuit 106. また、表示パネルの各行及び列に接続された書き込み回路106及び走査回路105をコントローラ104で順次制御することにより、フレームメモリに蓄積されていた画像に対応した表示パネル109の有機EL素子の発光を制御して所望の画像表示が得られる。 Further, by sequentially controlling the write circuit 106 and the scanning circuit 105 connected to each row and column of the display panel controller 104, a light emission of the organic EL elements of the display panel 109 corresponding to the image accumulated in the frame memory controlled to a desired image display can be obtained. 電源回路107は、表示パネル109の全有機EL素子への電源を供給する。 Power supply circuit 107 supplies power to all the organic EL elements of the display panel 109.

【0013】次に、表示パネル109の単位画素に対応する回路構成の例を図5に示す。 [0013] Next, Figure 5 shows the example of a circuit configuration corresponding to a unit pixel of the display panel 109. 図5において、FET In FIG. 5, FET
(Field Effect Transistor)201のゲートGは、走査回路105からの行を走査する走査信号が供給される走査電極線を形成し、一方FET201のソースSは、 The gate G of (Field Effect Transistor) 201 form a scanning electrode line scan signal for scanning lines from the scanning circuit 105 is supplied, while the source S of the FET201 is
書き込み回路106からのフレームメモリ103のデータに対応した信号が供給されるデータ電極線を形成している。 Signal corresponding to the data in the frame memory 103 forms a data electrode lines supplied from the write circuit 106.

【0014】FET201のドレインDはFET202 [0014] The drain D of FET201 is FET202
のゲートGに接続され、キャパシタ203を通じて接地されている。 Is connected to the gate G, it is grounded through a capacitor 203. FET202のソースSは接地され、ドレインDは有機EL素子205の陰極に接続され、有機E The source S of the FET202 is grounded, the drain D is connected to the cathode of the organic EL device 205, an organic E
L素子205の陽極を通じて電源に接続されている。 It is connected to the power supply through the anode of the L elements 205.

【0015】このような回路が行及び列に複数配列された表示パネル109の単位画素の発光制御動作は、FE The light emission control operation of the unit pixel of the display panel 109 such circuits are arrayed in rows and columns, FE
T201のゲートGにオン電圧が供給されると、FET When ON voltage is supplied to the gate G of the T201, FET
201はソースSに供給されるデータの電圧に対応した電流をソースSからドレインDへ流す。 201 passes a current corresponding to the voltage of the data supplied to the source S from the source S to the drain D.

【0016】FET201のゲートGがオフ電圧であるとFET201はいわゆるカットオフとなり、FET2 [0016] When the gate G of the FET201 is off voltage FET201 is a so-called cut-off, FET2
01のドレインDはオープン状態となる。 Drain D of 01 is in an open state. 従って、FE Therefore, FE
T201のゲートGがオン電圧の期間に、ソースSの電圧に基づいた電流でキャパシタ203が充電され、その電圧がFET202のゲートGに供給されてFET20 The period of the gate G is the ON voltage of the T201, the capacitor 203 is charged with current based on the voltage of the source S, the voltage that is supplied to the gate G of the FET202 to FET20
2はそのゲート電圧と電源から有機EL素子205を通じて供給されるドレインDにかかる電圧に基づいた電流が有機EL素子205を通じてドレインDからソースS 2 the source S from the drain D through the current organic EL element 205 based on the voltage applied to the drain D supplied through the organic EL element 205 from the gate voltage and the power source
へ流れ、有機EL素子205を発光せしめる。 To flow, it allowed to emit the organic EL element 205.

【0017】FET201のゲートGがオフ電圧になると、FET201はオープン状態となり、FET202 [0017] When the gate G of the FET201 is turned off voltage, FET201 becomes an open state, FET202
はキャパシタ203に蓄積された電荷によりゲートGの電圧が保持され、次の走査まで電流を維持し、有機EL Is held the voltage of the gate G is the charge accumulated in the capacitor 203 maintains the current until the next scan, the organic EL
素子205の発光も維持される。 Emitting element 205 is maintained.

【0018】なお、FET202のゲートGとソースS [0018] It is to be noted that the gate G and the source S of FET202
間にはゲート入力容量が存在するので、キャパシタ20 Since the gate input capacitance exists between the capacitor 20
3を省略しても上記と同様の動作が可能である。 It is omitted 3 are possible the same operation as described above.

【0019】上記した例では、FET201のソースS [0019] In the above example, the source of FET201 S
に供給されるデジタル輝度階調に従った電圧に基づいて有機EL素子の発光輝度を制御する場合について説明したが、FET201のソースSに供給される電圧を2値のデジタルデータとして、発光時間を制御して輝度階調を表すいわゆるサブフィールド法も知られている。 Based on the voltage in accordance with the digital luminance gradation to be supplied to the case has been described of controlling the emission luminance of the organic EL element, as binary digital data the voltage supplied to the source S of the FET 201, the light emission time controlled and are also known so-called sub-field method to represent a luminance gradation.

【0020】すなわちサブフィールド法では、1フレーム又は1フィールドを輝度階調に対応したいくつかのサブフィールドに分割し、それぞれのサブフィールドに所定の発光時間を割当て、各サブフィールドの組み合わせを制御することによって異なった発光時間を実現することによって輝度階調を表す方法である。 [0020] That is, in the sub-field method divides one frame or one field into several sub-fields corresponding to the luminance level, assign a predetermined light emission time to each of the sub-fields, to control the combinations of each subfield it is a way of expressing luminance gradation by implementing different emission time by.

【0021】 [0021]

【発明が解決しようとする課題】従来から輝度階調をとるにあたって、サブフィールド法等輝度階調を単位時間内における発光時間の重み付けにより表す駆動法が知られている。 When taking luminance gradation conventionally [0005] The driving method represented by weighting emission time a subfield method luminance gradation in the unit time are known. この方法においては、マトリクスを構成する各有機EL素子の瞬時輝度を一定にしないと、階調を正確に表すことができなくなる。 In this way, unless the instantaneous luminance of each organic EL element constituting the matrix constant, it is impossible to represent a gradation accurately. 一方、有機EL素子は電流制御発光素子、すなわち電流値に比例した発光強度を示す素子である。 On the other hand, the organic EL element is a current controlled light emitting device, i.e. a device that indicates the emission intensity proportional to the current value. そして、長時間発光し続けると有機E Then, a long period of time the light-emitting ever and organic E
L素子の物性が変化し有機EL素子自身の抵抗値が大きくなってしまうという特性を持っている。 The resistance of the physical properties changed organic EL element itself of L element has a characteristic that increases.

【0022】しかも、通常有機EL素子毎の発光頻度は異なるため、表示装置を長時間駆動すると有機EL素子毎の抵抗値に差が生じることとなり、各有機EL素子の瞬時輝度にも差が生じてしまう。 [0022] Moreover, since the light emission frequency of each normal organic EL element is different, it is a difference in the resistance value of each organic EL element is driven for a long time display device occurs, a difference in instantaneous brightness may occur in each organic EL element and will. これにより、入力映像信号に忠実な輝度階調を表現できないばかりか、表示すべき正しい輝度階調に対する誤差分の割合も各有機EL Thus, not only can not be expressed faithfully luminance gradation in the input video signal, the proportion of error of for the correct luminance gradation to be displayed each organic EL
素子毎にばらつきを生じるため、画面に輝度むらとなって現れる。 To produce a variation in each element appears as a luminance unevenness on the screen.

【0023】この問題を解決するためには、有機EL素子の素子抵抗の経時変化があっても各有機EL素子を流れる電流値が一定となるように駆動制御することが必要であり、例えば、各有機EL素子に流れる電流値が一定になるように定電流回路を設ける方法が考えられる。 [0023] In order to solve this problem, it is necessary to drive control so that the current value flowing even when aging of the element resistance of the organic EL element of each organic EL element is constant, for example, how current flowing through the organic EL element provided with constant current circuits to be constant can be considered.

【0024】上記したアクティブマトリクス駆動パネルでは、FET自身の持つ抵抗値によって有機EL素子を流れる電流値が決定されるよう、有機EL素子の抵抗値よりもFETの抵抗値が極大となるような特性条件(図3参照)で使用することで、定電流回路としても兼用することができる。 The above-mentioned in the active matrix drive panel, so that the value of the current flowing through the organic EL element by the resistance value possessed by the FET itself is determined, the characteristics such as the resistance of the FET is maximized than the resistance value of the organic EL device by using the condition (see FIG. 3), it can be also used as a constant current circuit.

【0025】しかしこの場合、消費電力が大きくなるという問題を生ずる。 [0025] However, in this case, results in a problem that power consumption is increased. また、有機EL素子毎に設置されるFETの抵抗値にばらつきがあると、各有機EL素子に流れる電流値もばらつき、各有機EL素子の瞬時輝度を一定にすることができない。 Further, when there is a variation in the resistance value of the FET to be installed in each organic EL element, it is impossible to current flowing through the organic EL element is also variation, a constant instantaneous luminance of each organic EL element.

【0026】本発明は、マトリクス駆動する有機EL表示装置において、サブフィールド法等、輝度階調を単位時間内における発光時間の重み付けにより表すようにした場合の上述した問題点を解決するものである。 [0026] The present invention provides an organic EL display device for matrix driving, the sub-field method or the like, is intended to solve the aforementioned problems in the case of so represented by weighting the emission time within a luminance gradation unit time .

【0027】本発明は、有機EL素子毎の瞬時輝度のばらつきによって画面に輝度むらが生じることを防止することを目的とし、1フレーム期間内における発光時間を調整することによりこれを補正しようとするものである。 The invention, to prevent the uneven brightness caused on the screen due to variations in the instantaneous luminance of each organic EL element intended to attempt to correct this by adjusting the light emission time in one frame period it is intended.

【0028】 [0028]

【課題を解決するための手段】上記課題を解決するために、請求項1に記載の発明は、各々有機エレクトロルミネッセンス素子による発光素子によってなる複数の画素が行及び列をなすようにマトリクス状に配列されて構成された表示パネルをアクティブマトリクス駆動する有機エレクトロルミネッセンス表示装置であって、各発光素子を所定の電圧値で駆動したときの各発光素子に流れる電流値を計測する計測手段と、計測手段により計測された電流値を記憶する記憶手段と、記憶手段により記憶された電流値と外部から入力された発光素子の発光輝度を表す輝度データとを用いて、1フレーム期間内における所望の発光時間を演算する演算手段とを備えたことを特徴とする。 In order to solve the above problems SUMMARY OF THE INVENTION The invention of claim 1, each plurality of pixels comprised by the light-emitting device with an organic electroluminescent element in a matrix in rows and columns the display panel is configured by arranged an organic electroluminescence display device for active matrix drive, a measuring means for measuring a current value flowing to each light emitting element when driving the respective light emitting elements with a predetermined voltage value, measured using storage means for storing a current value measured, and a brightness data representing the light emission luminance of the light emitting element which is input from the stored current value and the outside by storage means by means, desired emission in one frame period characterized by comprising a calculating means for calculating a time.

【0029】また、請求項2に記載の発明は、請求項1 [0029] The invention of claim 2, claim 1
に記載の有機エレクトロルミネッセンス表示装置であって、計測手段による計測は、表示装置の電源を断とする指令に応じて行うことを特徴とする。 An organic electroluminescent display device according to the measurement by the measuring means, and performing in response to a command to interrupt the power supply of the display device. また、請求項3に記載の発明は、請求項1又は2に記載の有機エレクトロルミネッセンス表示装置であって、演算手段は、各発光素子に流れる電流値を、基準とする発光素子を流れる電流値で除することにより相対値を演算により求め、さらに、輝度データに示された1フレーム期間内における発光時間を相対値で除することにより、1フレーム期間内における所望の発光時間を演算により求めることを特徴とする。 The invention described in Claim 3 is an organic electroluminescent display device according to claim 1 or 2, computing means, a current value flowing to each light emitting element, current flowing through the light-emitting element as a reference in determined by calculation of the relative value by dividing, further, divided by the relative value of the luminous time within one frame period shown in the luminance data, it is determined by calculating the desired light emission time in one frame period the features.

【0030】また、請求項4に記載の発明は、各々有機エレクトロルミネッセンス素子による発光素子によってなる複数の画素が行及び列をなすようにマトリクス状に配列されて構成された表示パネルをアクティブマトリクス駆動する有機エレクトロルミネッセンス表示装置の駆動方法であって、発光素子のそれぞれを所定の一定電圧で駆動すると共にその際発光素子のそれぞれに流れる電流値を記憶し、外部から入力された各発光素子に対応する輝度データを電流値を用いて演算して1フレーム期間内における所望の発光時間を求め、発光素子のそれぞれを発光時間駆動することを特徴とする。 Further, according to the invention described in claim 4, each plurality of pixels active matrix driving a display panel configured and arranged in a matrix in rows and columns comprising the light emitting device according to an organic electroluminescence element a driving method of an organic electroluminescence display device for the respective light emitting elements storing the time value of the current flowing through the respective light emitting elements to drive at a predetermined constant voltage, corresponding to the respective light emitting elements inputted from the outside the luminance data for seeking a desired light emission time in the operation to one frame period by using the current value, and drives the light emission time each of the light emitting element.

【0031】また、請求項5に記載の発明は、請求項4 [0031] The invention described in Claim 5, Claim 4
に記載の有機エレクトロルミネッセンス表示装置の駆動方法であって、計測手段による計測は、表示装置の電源を断とする指令に応じて行うことを特徴とする。 A driving method of an organic electroluminescent display device according to the measurement by the measuring means, and performing in response to a command to interrupt the power supply of the display device. また、 Also,
請求項6に記載の発明は、請求項4又は5に記載の有機エレクトロルミネッセンス表示装置の駆動方法であって、演算手段は、各発光素子に流れる電流値を、基準とする発光素子を流れる電流値で除することにより相対値を演算により求め、さらに、輝度データに示された1フレーム期間内における発光時間を相対値で除することにより、1フレーム期間内における所望の発光時間を演算により求めることを特徴とする。 The invention according to claim 6, a method for driving an organic electroluminescent display device according to claim 4 or 5, computing means, a current flowing in the current value flowing to each light emitting element, a light-emitting element as a reference obtained by calculation of the relative value by dividing a value, further, divided by the relative value of the luminous time within one frame period shown in the luminance data is obtained by calculating the desired light emission time in one frame period it is characterized in.

【0032】 [0032]

【作用】本発明は上述したように、長時間の駆動により有機EL素子毎の瞬時輝度の劣化の度合いにばらつきが生じた場合であっても、フレーム単位で見たときには、 DETAILED DESCRIPTION OF THE INVENTION The present invention as described above, even when the variation in the degree of deterioration of the instantaneous luminance of each organic EL element is caused by long-time driving, when viewed in frame units,
有機EL素子毎の輝度劣化の割合のばらつきは解消される。 Variations in the proportion of luminance degradation of each organic EL element is eliminated. 従って、画面に輝度むらが生じることのない有機E Thus, without the luminance unevenness on the screen organic E
L表示装置を提供することができる。 It is possible to provide a L display device.

【0033】請求項1に記載の発明は、有機エレクトロルミネッセンス表示装置において、各有機EL素子である発光素子を所定の電圧値で駆動したときの各発光素子に流れる電流値を計測する計測手段と、計測手段により計測された電流値を記憶する記憶手段と、記憶手段により記憶された電流値と外部から入力された発光素子の発光輝度を表す輝度データとを用いて、1フレーム期間内における所望の発光時間を演算する演算手段とを備えるように構成したので、各発光素子の駆動電流に対応した補正を行うことが可能となる。 The first aspect of the present invention, an organic electroluminescent display device, a measuring means for measuring a current value flowing to each light emitting element when driving the light-emitting element which is the organic EL element at a predetermined voltage value using storage means for storing a current value measured by the measuring means, and a luminance data representing the light emission luminance of the light emitting element which is input from the stored current value and the outside by storage means, optionally in one frame period because of the arrangement to include a calculating means for calculating a light emission time, it is possible to perform correction corresponding to the drive current of each light emitting element.

【0034】また、請求項2に記載の発明は、計測手段による計測は、表示装置の電源を断とする指令に応じて行うようにしたので、電流計測時の表示装置が全面同一輝度で発光する現象が表示動作の終了時に行われる。 Further, an invention according to claim 2, measurement by the measuring means, since to carry out in response to a command to interrupt the power supply of the display device, the current measurement when the display device emits light at the whole surface the same luminance phenomenon that is performed at the end of the display operation. また、請求項3に記載の発明は、演算手段は、各発光素子に流れる電流値を、基準とする発光素子を流れる電流値で除することにより相対値を演算により求め、さらに、 Further, an invention according to claim 3, computing means, a current value flowing to each light emitting element is obtained by calculating the relative value is divided by the value of the current flowing through the light-emitting element as a reference, and further,
輝度データに示された1フレーム期間内における発光時間を相対値で除することにより、1フレーム期間内における所望の発光時間を演算により求めるように構成したので、基準としない発光素子の発光時間を基準とした発光素子の発光時間を基に補正できる。 By dividing the relative value of the luminous time within one frame period shown in the luminance data, since it is configured to determine by calculation the desired light emission time in one frame period, the light emission time of the light emitting device that does not reference emission time of the reference light emission element can be corrected based.

【0035】また、請求項4に記載の発明は、有機エレクトロルミネッセンス表示装置の駆動方法であって、発光素子のそれぞれを所定の一定電圧で駆動すると共にその際発光素子のそれぞれに流れる電流値を記憶し、外部から入力された各発光素子に対応する輝度データを電流値を用いて演算して1フレーム期間内における所望の発光時間を求め、発光素子のそれぞれを発光時間駆動するようにできる。 Further, an invention according to claim 4, a driving method of an organic electroluminescent display device, the current flowing through the each of the time the light emitting element to drive the respective light emitting elements at a predetermined constant voltage stored, it obtains a desired light emission time in the operation to one frame period by using the current value of luminance data corresponding to the respective light emitting elements inputted from outside, the respective light emitting elements to drive the light-emitting time.

【0036】また、請求項5に記載の発明は、計測手段による計測は、表示装置の電源を断とする指令に応じて行う方法をとることにより、電流計測時の表示装置が全面同一輝度で発光する現象が表示動作の終了時に行われる。 Further, the invention according to claim 5, measurement by the measuring means, by taking the method of performing in response to a command to interrupt the power supply of the display device, the current measurement when the display device is on the whole surface the same luminance phenomenon in which light is emitted at the end of the display operation. また、請求項6に記載の発明は、演算手段は、各発光素子に流れる電流値を、基準とする発光素子を流れる電流値で除することにより相対値を演算により求め、さらに、輝度データに示された1フレーム期間内における発光時間を相対値で除することにより、1フレーム期間内における所望の発光時間を演算により求める方法としたので、基準としない発光素子の発光時間を基準とした発光素子の発光時間を基に補正できる。 The invention according to claim 6, computing means, a current value flowing to each light emitting element is obtained by calculating the relative value is divided by the value of the current flowing through the light-emitting element as a reference, further to the luminance data by dividing the emission time relative value in one frame period indicated, 1 since in the frame period has a method of obtaining by calculation the desired light emission time, emission relative to the emission time of the light emitting element which is not a reference It can be corrected based on the light emission time of the element.

【0037】 [0037]

【発明の実施の形態】本発明による有機EL表示装置及びその駆動方法を図1〜図3を参照して詳細に説明する。 The organic EL display device and a driving method according to an embodiment of the present invention with reference to FIGS described in detail. 図1は、本発明における有機EL表示装置の構成を示すブロック図、図2は有機EL表示装置の単位画素に対応する発光制御回路の構成例を示す図、図3は図2で用いられるFETの特性を示す図である。 Figure 1 is a block diagram showing a structure of an organic EL display device in the present invention, FIG, 3 2 showing a structural example of a light emission control circuit corresponding to a unit pixel of an organic EL display device is used in FIG FET is a diagram showing the characteristic.

【0038】図1において、101はA/D変換回路、 [0038] In FIG. 1, 101 A / D conversion circuit,
102は演算回路、103はフレームメモリ、104はコントローラ、105は走査回路、106は書き込み回路、107は電源回路、108は電流値メモリ、109 102 arithmetic circuit, 103 is a frame memory, 104 controller, 105 a scanning circuit, a write circuit 106, the power supply circuit 107, 108 is the current value memory, 109
は表示パネルを示す。 It shows the display panel.

【0039】A/D変換回路101は、アナログ映像信号入力を受けてデジタル映像信号データに変換する。 The A / D conversion circuit 101 converts the digital video signal data receiving an analog video signal input. 変換されたデジタル映像信号はA/D変換回路101から演算回路102へ供給され、電流値メモリ108からのデータを基にコントローラ104の制御により演算処理をされてフレームメモリ103へ供給され、コントローラ104の制御により書き込み蓄積される。 The converted digital video signal supplied from the A / D conversion circuit 101 to the arithmetic circuit 102, is the arithmetic processing by the control of the controller 104 based on the data from the current value memory 108 is supplied to the frame memory 103, controller 104 It is written accumulated by control of. この演算処理については後述する。 This calculation processing will be described later. コントローラ104は、入力映像信号の水平及び垂直同期信号に同期してフレームメモリ103他電源回路107までの各回路を制御する。 The controller 104 controls the respective circuits up to the frame memory 103, etc. Power circuit 107 in synchronism with the horizontal and vertical synchronizing signals of the input video signal.

【0040】フレームメモリ103に蓄積されたデジタル映像信号データは、コントローラ104によって読み出され、書き込み回路106に送られる。 The digital video signal data accumulated in the frame memory 103 is read by the controller 104 and sent to the write circuit 106. また、表示パネルの各行及び列に接続された書き込み回路106及び走査回路105をコントローラ104で順次制御することにより、フレームメモリに蓄積されていた画像に対応した表示パネル109の有機EL素子の発光時間を例えばサブフィールド法等により制御して所望の画像表示が得られる。 Further, by sequentially controlling the write circuit 106 and the scanning circuit 105 connected to each row and column of the display panel controller 104, the light emission time of the organic EL elements of the display panel 109 corresponding to the image accumulated in the frame memory for example controlled by the subfield method such as a desired image display can be obtained. 電源回路107は、表示パネル109の全有機EL素子への電源を供給し、コントローラ104によって制御される。 Power supply circuit 107 supplies power to all the organic EL elements of the display panel 109 is controlled by the controller 104. また、電流値メモリ108は、表示パネル109の各有機EL素子である有機EL素子の駆動電流に対応した値を記憶しておき、コントローラ104 The current value memory 108 may store a value corresponding to the driving current of the organic EL device is the organic EL elements of the display panel 109, the controller 104
によって制御される。 It is controlled by.

【0041】ここで前記した演算処理について説明する。 The described calculation processing said here. 上述したように電流値メモリ108には各有機EL Each organic EL is a current value memory 108 as described above
素子の駆動電流に対応した値がコントローラ104により指示されたときに記憶される。 Value corresponding to the driving current of the element is stored when it is instructed by the controller 104. 例えば、表示装置の電源を断とする前に表示パネル109の全有機EL素子に対しコントローラ104から同一輝度データに対応する発光制御を行う。 For example, it controls light emission corresponding to the same luminance data from the controller 104 with respect to the total organic EL elements of the display panel 109 prior to the cross-sectional power of the display device.

【0042】これは、表示パネル109の全有機EL素子を同一の定電圧で駆動することを意味する。 [0042] This means that drives all organic EL elements of the display panel 109 at the same constant voltage. 各有機E Each of the organic E
L素子はそれぞれ駆動電流に対する発光輝度特性が異なれば同一電圧の駆動でも異なった発光電流を示す。 L elements exhibit different light emission current in the driving of the same voltage Different emission luminance characteristic for each drive current. 通常頻繁に高輝度で発光される有機EL素子は発光輝度特性の劣化が他の有機EL素子よりも進行し、この定電圧駆動の場合の発光電流が他の有機EL素子よりも少なくなる。 Usually frequent organic EL element to emit light at high luminance proceeds than the degradation of other organic EL elements of the light emitting luminance characteristics, emission current when the constant voltage drive is less than other organic EL elements.

【0043】従って、発光輝度特性の劣化が最大の有機EL素子の発光電流を基準に他の有機EL素子の駆動電流を補正し、補正された発光階調データに基づいて有機EL素子の発光時間を制御することにより表示パネル1 [0043] Thus, the emission deterioration of luminance characteristic corrects the drive current of the other organic EL elements based on the light emission current of the maximum of the organic EL device, light emission time of the organic EL element based on the corrected light emission gradation data display panel by controlling the 1
09の全有機EL素子の発光状態を入力映像信号に正確に比例した画像表示を得ることが可能となる。 It is possible to obtain an accurate proportion to the image display has the input video signal to the light emitting state of all organic EL elements 09.

【0044】上述したような方法でコントローラ104 [0044] The controller 104 in the manner described above
の制御に従って電流値メモリ108には補正用の電流値が記憶されており、次に演算回路102はコントローラ104の制御に従って所定の記憶された電流値を読み込み、例えば前述した各有機EL素子の発光電流が最小の値の基準値によって除することで基準値に対するレシオを輝度データの補正値として演算により求める。 And the stored current value of the correction to the current value memory 108 under the control of, then the arithmetic circuit 102 reads a predetermined stored current value in accordance with the control of the controller 104, for example, light emission of the organic EL elements described above current determined by calculation ratio with respect to the reference value as a correction value of the luminance data by dividing by the reference value of the minimum value.

【0045】求められた補正値は、発光電流の最小値を基準値とすることにより1以上の値となる。 The correction value determined is a value of 1 or more by a reference value the minimum value of the emission current. この求められた各画素に対する補正値で演算回路102への入力デジタル映像信号データを除することによって補正されたデジタル映像信号データとしてフレームメモリ103へ供給する。 Supplied as digital video signal data corrected by dividing an input digital video signal data to the arithmetic circuit 102 by the correction value for each pixel is thus determined to the frame memory 103.

【0046】すなわち、補正値は1以上の値であるので電流値メモリに記憶された電流の内最小の電流値を有する有機EL素子に対応する補正後の輝度データは変化せず、他の有機EL素子に対応する輝度データは元の輝度データより減少することになる。 [0046] That is, the luminance data after the correction the correction value corresponding to the organic EL element having an inner minimum current value of the current stored in the current value memory because one or more values ​​are not changed, other organic luminance data corresponding to the EL element will decrease than the original luminance data.

【0047】もちろん電流値メモリ108の最小値が0 [0047] Of course, the minimum value of the current value memory 108 is 0
の場合や、異常に小さい場合は正常な補正ができなくなるので、後述するようにこれを除去する手段を設ける。 Or if the so when unusually small can not normally corrected, provided the means for removing this as described below.

【0048】次に、表示パネル109の単位画素に対応する回路構成の例を図2に示す。 Next, an example of a circuit configuration corresponding to a unit pixel of the display panel 109 in FIG. 図2において、FET In FIG. 2, FET
201のゲートGは、走査回路105からの行を走査する走査信号が供給される走査電極線を形成し、一方FE The gate G of the 201 form a scanning electrode line scan signal for scanning lines from the scanning circuit 105 is supplied, whereas FE
T201のソースSは、書き込み回路106からのフレームメモリ103のデータに対応した信号が供給されるデータ電極線を形成している。 The source S of T201 forms a data electrode line to which a signal corresponding to the data of the frame memory 103 from the write circuit 106 is supplied.

【0049】FET201のドレインDはFET202 The drain D of FET201 is FET202
のゲートGに接続され、キャパシタ203を通じて接地されている。 Is connected to the gate G, it is grounded through a capacitor 203. FET202のソースSは接地され、ドレインDは電流計測手段としての電流検出器204を通じて有機EL素子205の陰極に接続され、有機EL素子205の陽極を通じて電源制御線に接続されている。 The source S of the FET202 is grounded, the drain D is connected to the cathode of the organic EL element 205 through the current detector 204 as current measuring means are connected to the power supply control line through the anode of the organic EL element 205.

【0050】このような回路が行及び列に複数配列された表示パネル109の単位画素の発光制御動作は、FE The light emission control operation of the unit pixel of the display panel 109 such circuits are arrayed in rows and columns, FE
T201のゲートGにオン電圧が供給されると、FET When ON voltage is supplied to the gate G of the T201, FET
201はソースSに供給されるデータの電圧に対応した電流をソースSからドレインDへ流す。 201 passes a current corresponding to the voltage of the data supplied to the source S from the source S to the drain D.

【0051】FET201のゲートGがオフ電圧であるとFET201はいわゆるカットオフとなり、FET2 [0051] When the gate G of the FET201 is off voltage FET201 is a so-called cut-off, FET2
01のドレインDはオープン状態となる。 Drain D of 01 is in an open state. 従って、FE Therefore, FE
T201のゲートGがオン電圧の期間に、ソースSの電圧に基づいた電流でキャパシタ203が充電され、その電圧がFET202のゲートGに供給されてFET20 The period of the gate G is the ON voltage of the T201, the capacitor 203 is charged with current based on the voltage of the source S, the voltage that is supplied to the gate G of the FET202 to FET20
2はそのゲート電圧と電源から有機EL素子205を通じて供給されるドレインDにかかる電圧に基づいた電流が有機EL素子205、電流検出器204を通じてドレインDからソースSへ流れ、有機EL素子205を発光せしめる。 2 flows from the drain D through its gate voltage and current organic EL element 205 based on the voltage applied to the drain D supplied through the organic EL element 205 from the power supply, the current detector 204 to the source S, the light emitting organic EL element 205 allowed to.

【0052】FET201のゲートGがオフ電圧になると、FET201はオープン状態となり、FET202 [0052] When the gate G of the FET201 is turned off voltage, FET201 becomes an open state, FET202
はキャパシタ203に蓄積された電荷によりゲートGの電圧が保持され、次の走査まで電流を維持し、有機EL Is held the voltage of the gate G is the charge accumulated in the capacitor 203 maintains the current until the next scan, the organic EL
素子205の発光も維持される。 Emitting element 205 is maintained.

【0053】電流検出器204は、有機EL素子205 [0053] The current detector 204, the organic EL element 205
と直列に接続され、有機EL素子205に流れる電流を検出し、A/D変換回路206によりデジタルデータとして電流値メモリ207に記憶される。 And are connected in series, detects a current flowing through the organic EL element 205, stored by the A / D converter 206 into a current value memory 207 as digital data. 電流検出器20 Current detector 20
4は、FET202のソースと接地の間に設けても良い。 4, may be provided between the ground and the source of FET202. なお、FET202のゲートGとソースS間にはゲート入力容量が存在するので、キャパシタ203を省略しても上記と同様の動作が可能であることは従来と同様である。 Incidentally, between the gate G and the source S of the FET202 the gate input capacitance is present, it be omitted capacitor 203 is capable of the same operation as described above is conventional.

【0054】以上説明したように、電流値メモリ108 [0054] As described above, the current value memory 108
及び演算回路102を設け、上述のような処理を行うことにより、表示パネル109の全有機EL素子の発光状態を入力映像信号に正確に比例した画像表示を得ることが可能となるが、電流値メモリ108の電流値データの最小値を基準値とすれば、補正後の有機EL素子の発光強度が全て補正しない場合よりも低下するように制御されることとなり、デジタル輝度階調からはみ出すようなオーバフローを生じる危険を避けることができる。 And an arithmetic circuit 102 is provided, by performing the processing as described above, it is possible to obtain an accurate proportion to the image display has the input video signal to the light emitting state of all organic EL elements of the display panel 109, a current value If the reference value the minimum value of the current data in the memory 108, will be controlled to lower than when the light emission intensity of the organic EL element after the correction does not correct all, such as to protrude from the digital luminance gradation it is possible to avoid the danger caused the overflow.

【0055】前述した基準値が0等の欠陥有機EL素子が存在する場合には、演算回路102で電流値メモリ1 [0055] When the reference value described above defect exists organic EL element, such as 0, the current value memory 1 by the arithmetic circuit 102
08からデータを読み取る際に、極端にずれた値を示すデータを予め定めた値に置き換えるような処理をして異常値を除いたり、予めサンプリングにより平均値や分散を求めて異常値を修正する等様々な方法をとることができる。 When reading data from the 08 extremely deviated or excluding outliers processing to that replaces the predetermined value data indicating the value obtained is corrected outliers the average value and variance in advance by the sampling etc. various methods can take.

【0056】また、発光時間の制御は前述した単純マトリクス駆動の場合は、いわゆるパルス幅変調により行うことができ、TFT(Thin Film Transistor)を用いたアクティブマトリクス駆動の場合は、サブフィールド法による制御で行うことができる。 [0056] In the case the control of the light emission time of the simple matrix drive described above, can be carried out by a so-called pulse width modulation, in the case of an active matrix driving using a TFT (Thin Film Transistor), control by the sub-field method it can be carried out in.

【0057】上述した本発明の目的は、同一駆動電流では表示パネル109の各有機EL素子は同一の発光輝度となるという前提をおいており、この前提に立てば定電流回路を用いることによっても達成できることになるが、前述したような消費電力の問題を生ずる。 [0057] An object of the present invention described above, the same driving current each organic EL element of the display panel 109 and at a premise that the same emission luminance, by using a constant current circuit you stand on this premise It would be achieved, but produces the problem of power consumption as described above. 本発明によれば、FETに定電流回路の機能を持たせる必要はなくなり、FETは、スイッチング素子の機能だけを使用するように使用特性の条件を設定(図3のb点)でき、 According to the present invention, no longer required to have the function of the constant current circuit to the FET, FET can set conditions for use properties to use the functions of a switching element (b point in Fig. 3),
消費電力の低下をも図ることができる。 It may also be achieved a reduction in power consumption. 図3は、図2に示したFETのソース−ドレイン間の電圧−電流特性の一例を示している。 3, the source of the FET shown in FIG. 2 - shows an example of current characteristics - drain voltage.

【0058】図3において、横軸はFETのソース−ドレイン間の電圧Vsd、縦軸は横軸の電圧に対応するF [0058] In FIG. 3, the horizontal axis represents the source of the FET - drain voltage Vsd, the vertical axis corresponds to the voltage of the horizontal axis F
ETのソース−ドレイン間に流れる電流Isdを示す。 ET sources - shows the current Isd that flows between the drain.
Vg1〜Vg3は、ゲート−ソース間のゲート電圧を表し、Vg3>Vg2>Vg1の関係にある。 Vg1~Vg3 the gate - represents the gate-source voltage, a relationship of Vg3> Vg2> Vg1. b点は前述した点のスイッチング素子として用いたときのオン時の動作点を、a点は前述した定電流回路として用いた時の動作点をそれぞれ相対的に示している。 point b the operating point at the time of on-when used as a switching element of a point described above, a point indicates relatively respectively operating points when used as a constant current circuit described above.

【0059】上述した例では、各有機EL素子の発光電流の計測はコントローラ104の制御により表示装置の電源を断とする前に行われる例を示したが、表示装置の電源を投入した時に行っても良く、また、タイマを内蔵していれば所定の時間間隔で行っても良く、さらには表示装置の電源の投入回数により所定の回数毎に行っても良い。 [0059] In the above example, the measurement of the light emission current of the organic EL device showed an example that takes place prior to the cross-sectional power of the display device under the control of the controller 104, performed when the power supply of the display device at best, also, if a timer may be performed at predetermined time intervals, and further may be performed every predetermined number of times by charged number of the power supply of the display device.

【0060】いずれの場合も電流値メモリへの電流値記憶時には表示パネルの全有機EL素子は同一電圧で駆動されるので全面ほぼ同一輝度で発光することとなり、前述した表示装置の電源を断にする時に電流の計測と記憶を行うのが適している。 [0060] Since even at the time of the current value storage to the current memory total organic EL elements of the display panel is driven at the same voltage in any case will be emitting the entire surface substantially the same luminance, the interrupt the power supply of the display device described above to carry out the measurement and storage of the current is appropriate when.

【0061】また、表示パネルの有機EL素子を例えば右下隅に設けたコメント表示ブロックと他の主表示部分に分け、時間的に分割して電流計測及び記憶を行えば、 [0061] Further, divided into the comment display block and the other main display portion provided with the organic EL element, for example, in the lower right corner of the display panel, by performing current measurement and storage are divided temporally,
電流記憶モードの表示等に表示パネルの一部分を利用することもできる。 It is also possible to use a portion of the display panel on the display of the current memory mode.

【0062】なお、電流値メモリには電流値を記憶させるように説明したが、電流値に比例するものであれば抵抗値等でも良い。 [0062] Although the current memory has been described as to store the current value may be a resistance value as long as it is proportional to the current value or the like. また、基準値の最初の値を初期基準値として適宜なメモリに記憶しておき、その都度の基準値を初期基準値と比較して、駆動電源電圧そのものを制御することで表示パネルの全体にわたる輝度を制御し安定な輝度を維持することも可能である。 Further, the first value of the reference value is stored in an appropriate memory as an initial reference value is compared with reference values ​​in each case the initial reference value, throughout the display panel by controlling the drive power supply voltage itself it is also possible to maintain a stable brightness control brightness.

【0063】 [0063]

【発明の効果】以上の如く、本発明によれば、長時間の駆動により有機EL素子毎の瞬時輝度の劣化の度合いにばらつきが生じた場合であっても、フレーム単位で見たときには、有機EL素子毎の輝度劣化の割合のばらつきは解消される。 As evident from the foregoing description, according to the present invention, even when a variation occurs in the degree of deterioration of the instantaneous luminance of each organic EL element by prolonged driving, when viewed in frame units, organic variations in the proportion of luminance degradation of each EL element is eliminated. 従って、画面に輝度むらが生じることのない有機EL表示装置を提供することができる。 Therefore, it is possible to provide an organic EL display device without the luminance unevenness on the screen.

【0064】請求項1に記載の発明は、有機エレクトロルミネッセンス表示装置において、各有機EL素子である発光素子を所定の電圧値で駆動したときの各発光素子に流れる電流値を計測する計測手段と、計測手段により計測された電流値を記憶する記憶手段と、記憶手段により記憶された電流値と外部から入力された発光素子の発光輝度を表す輝度データとを用いて、1フレーム期間内における所望の発光時間を演算する演算手段とを備えるように構成したので、各発光素子の駆動電流に対応した補正を行うことにより画面に輝度むらが生じることのない有機EL表示装置を提供することができる。 [0064] According to one aspect of the present invention, an organic electroluminescent display device, a measuring means for measuring a current value flowing to each light emitting element when driving the light-emitting element which is the organic EL element at a predetermined voltage value using storage means for storing a current value measured by the measuring means, and a luminance data representing the light emission luminance of the light emitting element which is input from the stored current value and the outside by storage means, optionally in one frame period since it is configured to include a calculating means for calculating a light emission time, it is possible to provide an organic EL display device without the luminance unevenness on a screen by performing correction corresponding to the drive current of each light emitting element .

【0065】また、請求項2に記載の発明は、計測手段による計測は、表示装置の電源を断とする指令に応じて行うようにしたので、電流計測時の表示装置が全面同一輝度で発光する現象が表示動作の終了時に行われるので、電流計測時の現象が表示動作に与える影響を低減することができる。 [0065] Further, an invention according to claim 2, measurement by the measuring means, since to carry out in response to a command to interrupt the power supply of the display device, the current measurement when the display device emits light at the whole surface the same luminance since a phenomenon that takes place at the end of the display operation, it is possible to reduce the influence of the phenomenon at the time of current measurement gives the display operation. また、請求項3に記載の発明は、演算手段は、各発光素子に流れる電流値を、基準とする発光素子を流れる電流値で除することにより相対値を演算により求め、さらに、輝度データに示された1フレーム期間内における発光時間を相対値で除することにより、1 The invention according to claim 3, computing means, a current value flowing to each light emitting element is obtained by calculating the relative value is divided by the value of the current flowing through the light-emitting element as a reference, further to the luminance data by dividing the relative value of the light emission time in one frame period indicated, 1
フレーム期間内における所望の発光時間を演算により求めるように構成したので、基準としない発光素子の発光時間を基準とした発光素子の発光時間を基に補正でき、 Since it is configured the desired light emission time in the frame period, as obtained by calculation it can be corrected based on the light emission time of the light emitting element relative to the light emitting time of the light emitting element which is not a reference,
画面に輝度むらが生じることのない有機EL表示装置を提供することができる。 It is possible to provide an organic EL display device without the luminance unevenness on the screen.

【0066】また、請求項4に記載の発明は、有機エレクトロルミネッセンス表示装置の駆動方法であって、発光素子のそれぞれを所定の一定電圧で駆動すると共にその際発光素子のそれぞれに流れる電流値を記憶し、外部から入力された各発光素子に対応する輝度データを電流値を用いて演算して1フレーム期間内における所望の発光時間を求め、発光素子のそれぞれを発光時間駆動するようにしたので、画面に輝度むらが生じることのない有機EL表示装置を提供することができる。 [0066] Further, an invention according to claim 4, a driving method of an organic electroluminescent display device, the current flowing through the each of the time the light emitting element to drive the respective light emitting elements at a predetermined constant voltage stored, obtains a desired light emission time in the operation to one frame period by using the current value of luminance data corresponding to the respective light emitting elements inputted from the outside, since the respective light-emitting element so as to drive the light emission time , it is possible to provide an organic EL display device without the luminance unevenness on the screen.

【0067】また、請求項5に記載の発明は、計測手段による計測は、表示装置の電源を断とする指令に応じて行う方法をとることにより、電流計測時の表示装置が全面同一輝度で発光する現象が表示動作の終了時に行われるので、電流計測時の現象が表示動作に与える影響を低減することができる。 [0067] Further, the invention according to claim 5, measurement by the measuring means, by taking the method of performing in response to a command to interrupt the power supply of the display device, the current measurement when the display device is on the whole surface the same luminance since the phenomenon of light emission is performed at the end of the display operation, it is possible to reduce the influence of the phenomenon at the time of current measurement gives the display operation. また、請求項6に記載の発明は、 The invention according to claim 6,
演算手段は、各発光素子に流れる電流値を、基準とする発光素子を流れる電流値で除することにより相対値を演算により求め、さらに、輝度データに示された1フレーム期間内における発光時間を相対値で除することにより、1フレーム期間内における所望の発光時間を演算により求める方法としたので、基準としない発光素子の発光時間を基準とした発光素子の発光時間を基に補正できるので、画面に輝度むらが生じることのない有機EL表示装置を提供することができる。 Calculating means, a current value flowing to each light emitting element is obtained by calculating the relative value is divided by the value of the current flowing through the light-emitting element as a reference, further the light emission time in one frame period shown in the luminance data by dividing a relative value, 1 since the desired light emission time in the frame period has a method for obtaining by calculation, since the light emission time of the light emitting device that does not reference can be corrected based on the light emission time of the light emitting element on the basis, it is possible to provide an organic EL display device without the luminance unevenness on the screen.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明における有機EL表示装置の構成を示すブロック図である。 Is a block diagram showing a structure of an organic EL display device in the invention; FIG.

【図2】本発明における有機EL表示装置の単位画素に対応する発光制御回路の構成例を示す図である。 It is a diagram illustrating a configuration example of a light emission control circuit corresponding to a unit pixel of an organic EL display device in the present invention; FIG.

【図3】本発明における発光制御回路に使用するFET [Figure 3] FET used for emission control circuit of the present invention
の特性例を示す図である。 It is a diagram showing a characteristic example.

【図4】従来の有機EL表示装置の構成を示すブロック図である。 4 is a block diagram showing the structure of a conventional organic EL display device.

【図5】従来の有機EL表示装置の発光制御回路に使用するFETの特性例を示す図である。 5 is a diagram showing a characteristic example of a FET to be used for light emission control circuit of a conventional organic EL display device.

【図6】有機EL素子の概略構成を示す。 Figure 6 shows a schematic configuration of an organic EL device.

【図7】有機EL素子を等価的に表した電気回路図である。 7 is an electric circuit diagram showing the organic EL element equivalently.

【図8】有機EL素子の単純マトリクス駆動方式を示す図である。 8 is a diagram showing a simple matrix driving method of the organic EL element.

【符号の説明】 DESCRIPTION OF SYMBOLS

101 ・・・・ A/D変換回路 102 ・・・・ 演算回路 103 ・・・・ フレームメモリ 104 ・・・・ コントローラ 105 ・・・・ 走査回路 106 ・・・・ 書き込み回路 107 ・・・・ 電源回路 108 ・・・・ 電流値メモリ 109 ・・・・ 表示パネル 201 ・・・・ FET 202 ・・・・ FET 203 ・・・・ キャパシタ 204 ・・・・ 電流検出器 205 ・・・・ 有機EL素子 206 ・・・・ A/D変換回路 207 ・・・・ 電流値メモリ 101 ... A / D conversion circuit 102 ... arithmetic circuit 103 .... frame memory 104 ... controller 105 ... scanning circuit 106 ... write circuit 107 ... Power circuit 108 .... current value memory 109 ... display panel 201 ... FET 202 ... FET 203 ... capacitor 204 ... current detector 205 ... organic EL device 206 ... A / D conversion circuit 207 ... current value memory

Claims (6)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 各々有機エレクトロルミネッセンス素子による発光素子によってなる複数の画素が行及び列をなすようにマトリクス状に配列されて構成された表示パネルをアクティブマトリクス駆動する有機エレクトロルミネッセンス表示装置であって、 前記各発光素子を所定の電圧値で駆動したときの前記各発光素子に流れる電流値を計測する計測手段と、 前記計測手段により計測された前記電流値を記憶する記憶手段と、 該記憶手段により記憶された電流値と外部から入力された発光素子の発光輝度を表す輝度データとを用いて、1 1. A organic electroluminescent display device in which a plurality of pixels composed by the light-emitting device according to each organic electroluminescent element is an active matrix drive a display panel configured and arranged in a matrix in rows and columns a measuring means for measuring a current value flowing to the each light emitting element at the time of driving the respective light emitting elements with a predetermined voltage value, and storing means for storing the current value measured by said measuring means, the storage means by using the luminance data representing the light emission luminance of the light emitting element which is input from the stored current value and the outside by, 1
    フレーム期間内における所望の発光時間を演算する演算手段とを備えたことを特徴とする有機エレクトロルミネッセンス表示装置。 The organic electroluminescence display device characterized by comprising a calculating means for calculating a desired light emission time in the frame period.
  2. 【請求項2】 前記計測手段による計測は、前記表示装置の電源を断とする指令に応じて行うことを特徴とする請求項1に記載の有機エレクトロルミネッセンス表示装置。 Wherein measurement by said measuring means, the organic electroluminescent display device according to claim 1, characterized in that in response to a command to interrupt the power supply of the display device.
  3. 【請求項3】 前記演算手段は、前記各発光素子に流れる電流値を、基準とする発光素子を流れる電流値で除することにより相対値を演算により求め、さらに、前記輝度データに示された1フレーム期間内における発光時間を前記相対値で除することにより、1フレーム期間内における所望の発光時間を演算により求めることを特徴とする請求項1又は2に記載の有機エレクトロルミネッセンス表示装置。 Wherein said computing means, a current value flowing to the each light emitting element is obtained by calculating the relative value is divided by the value of the current flowing through the light-emitting element as a reference, further shown in the luminance data by dividing the relative value the light emission time in one frame period, the organic electroluminescent display device according to claim 1 or 2, characterized in that obtained by calculation of the desired light emission time in one frame period.
  4. 【請求項4】 各々有機エレクトロルミネッセンス素子による発光素子によってなる複数の画素が行及び列をなすようにマトリクス状に配列されて構成された表示パネルをアクティブマトリクス駆動する有機エレクトロルミネッセンス表示装置の駆動方法であって、 前記発光素子のそれぞれを所定の一定電圧で駆動すると共にその際前記発光素子のそれぞれに流れる電流値を記憶し、 外部から入力された前記各発光素子に対応する輝度データを前記電流値を用いて演算して1フレーム期間内における所望の発光時間を求め、 前記発光素子のそれぞれを前記発光時間駆動することを特徴とする有機エレクトロルミネッセンス表示装置の駆動方法。 4. A method for driving an organic electroluminescent display device in which a plurality of pixels composed by the light-emitting device according to each organic electroluminescent element is an active matrix drive a display panel configured and arranged in a matrix in rows and columns a is, where to store the value of the current flowing to each of the light emitting element, the luminance data corresponding to the respective light emitting elements inputted from external current to drive each of the light emitting element at a predetermined constant voltage It obtains a desired light emission time in one frame period calculated by using the value, the driving method of an organic electroluminescence display device and drives the light emission time of each of the light emitting element.
  5. 【請求項5】 前記計測手段による計測は、前記表示装置の電源を断とする指令に応じて行うことを特徴とする請求項4に記載の有機エレクトロルミネッセンス表示装置の駆動方法。 By the measuring method according to claim 5, wherein said measuring means, the driving method of the organic electroluminescent display device according to claim 4, characterized in that in response to a command to interrupt the power supply of the display device.
  6. 【請求項6】 前記演算手段は、前記各発光素子に流れる電流値を、基準とする発光素子を流れる電流値で除することにより相対値を演算により求め、さらに、前記輝度データに示された1フレーム期間内における発光時間を前記相対値で除することにより、1フレーム期間内における所望の発光時間を演算により求めることを特徴とする請求項4又は5に記載の有機エレクトロルミネッセンス表示装置の駆動方法。 Wherein said computing means, a current value flowing to the each light emitting element is obtained by calculating the relative value is divided by the value of the current flowing through the light-emitting element as a reference, further shown in the luminance data by dividing the relative value the light emission time in one frame period, the driving of the organic electroluminescent display device according to claim 4 or 5, characterized in that obtained by calculation of the desired light emission time in one frame period Method.
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JP2002175041A (en) * 2000-09-08 2002-06-21 Semiconductor Energy Lab Co Ltd Self-luminous device and its drive method
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