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

Organic electroluminescent display device, and driving method therefor

Info

Publication number
JPH10254410A
JPH10254410A JP9076533A JP7653397A JPH10254410A JP H10254410 A JPH10254410 A JP H10254410A JP 9076533 A JP9076533 A JP 9076533A JP 7653397 A JP7653397 A JP 7653397A JP H10254410 A JPH10254410 A JP H10254410A
Authority
JP
Japan
Prior art keywords
light emitting
organic
display device
current value
light emission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9076533A
Other languages
Japanese (ja)
Inventor
Kunio Imai
邦男 今井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP9076533A priority Critical patent/JPH10254410A/en
Publication of JPH10254410A publication Critical patent/JPH10254410A/en
Pending legal-status Critical Current

Links

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。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescence (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。図6に、かかる有機EL素
子の概略構成を示す。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。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。
2. Description of the Related Art Conventionally, there has been known an organic EL device which emits light by applying a current to a phosphor formed on a glass plate or a transparent organic film. FIG. 6 shows a schematic configuration of such an organic EL element. 6, a transparent electrode 2 is formed on an upper surface of a glass substrate 1, and a light emitting layer 3 is formed on an upper surface of the transparent electrode 2. Further, a 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。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
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。
FIG. 7 is an electric circuit diagram equivalently showing an organic EL element. Generally, as shown in FIG. 7, an organic EL element has a circuit resistance component R, a capacitance component C, and a light emission component D.
Is considered to be a capacitive light emitting element equivalently represented by

【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。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。
Accordingly, when a light emission driving voltage is applied to an organic EL element, first, a charge corresponding to the capacitance of the element flows into an electrode as a displacement current and is accumulated. Subsequently, when a certain voltage (barrier voltage) is exceeded, it is considered that a current starts to flow from the electrode to the organic layer, and light emission starts in proportion to this 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。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。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b1 〜bn 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a1 〜am を介して接続されている。
Further, an example of a display device using a plurality of organic EL elements will be described with reference to FIG. As shown in FIG. 8, such a display device includes a cathode line scanning circuit 51, an anode line driving circuit 52, and a display panel (not shown). 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 Connected through.

【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A1 〜Am と陰極線B1
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E1,1 〜Em,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521 〜52m 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。
[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 ~
B n are arranged in a matrix (lattice), and organic EL elements E 1,1 to Em , n are connected to intersections of anode lines and cathode lines arranged in the matrix. Either one is sequentially selected and scanned at a fixed time interval, and the other line is driven by a current source 52 1 to 52 m as a driving source in synchronization with this scanning, so that an organic EL element at an arbitrary intersection position is obtained. Is caused 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
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B1 〜Bn に陰極線走査
回路51を接続すると共に、陽極線A1 〜Am に電流源
521 〜52m からなる陽極線ドライブ回路52を接続
したものである。陰極線走査回路51は、スイッチ53
1 〜53n 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B1〜Bn
対してアース電位(0V)を順次与えていく。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541 〜54m をオン・
オフ制御することにより陽極線A1 〜Am に電流源52
1 〜52m 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。
[0007] There are two methods of driving the organic EL element: cathode scan / anode drive, anode scan / cathode drive.
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 The anode line drive circuit 52 of 1 to 52 m is connected. The cathode line scanning circuit 51 includes a switch 53
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. The anode line drive circuit 52 turns on the switches 54 1 to 54 m in synchronization with the switch scanning of the cathode line scanning circuit 51.
Current source 52 to an anode line A 1 to A m by turning off control
1 to 52 m is connected, and a drive current is supplied to the organic EL element at a desired intersection position.

【0008】例えば、有機EL素子E2,1 〜E3,1 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531 がアース側に切り換えら
れ、第1の陰極線B1 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542 と543
を電流源側に切り換え、陽極線A2 とA3 に電流源52
2 と523 を接続してやれば良い。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。
[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
Switching the current source side, the current source 52 to the anode line A 2 and A 3
You may do it by connecting the 2 and 52 3. By repeating such scanning and driving at a high speed, the organic EL element at an arbitrary position emits light, and control is performed so that each organic EL element emits light simultaneously.

【0009】走査中の陰極線B1 以外の他の陰極線B2
〜Bn 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。な
お、前記図8では、駆動源として電流源521 〜52m
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。
A cathode line B 2 other than the scanning cathode line B 1
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. In FIG. 8, the current sources 52 1 to 52 m are used as driving sources.
Is used, but the same can be realized by using 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。
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
は表示パネルを示す。
FIG. 4 is a block diagram showing a configuration of an organic EL display device using the organic EL element having the above-described configuration.
4, reference numeral 101 denotes an A / D conversion circuit, 103 denotes a frame memory, 104 denotes a controller, 105 denotes a scanning circuit, 106 denotes a writing circuit, 107 denotes a power supply circuit, and 109 denotes a power supply circuit.
Indicates a 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。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
の制御により書き込み蓄積される。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 A / D conversion circuit 101 receives an analog video signal and converts it into digital video signal data. The converted digital video signal is supplied from the A / D conversion circuit 101 to the frame memory 103,
Is written and stored under the control of. Controller 104
Controls each circuit of the frame memory 103 and other power supply circuits 107 in synchronization with the horizontal and vertical synchronization 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。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。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。
The digital video signal data stored in the frame memory 103 is read by the controller 104 and sent to the writing circuit 106. In addition, by sequentially controlling the writing circuit 106 and the scanning circuit 105 connected to each row and column of the display panel by the controller 104, light emission of the organic EL element of the display panel 109 corresponding to the image stored in the frame memory is achieved. By controlling, a desired image display is obtained. The 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。図5において、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、
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。
Next, an example of a circuit configuration corresponding to a unit pixel of the display panel 109 is shown in FIG. In FIG. 5, the FET
The gate G of the (Field Effect Transistor) 201 forms a scanning electrode line to which a scanning signal for scanning a row from the scanning circuit 105 is supplied, while the source S of the FET 201 is
A data electrode line to which a signal corresponding to data of the frame memory 103 from the writing circuit 106 is supplied is formed.

【0014】FET201のドレインDは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。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
L素子205の陽極を通じて電源に接続されている。
The drain D of the FET 201 is
, And grounded through a capacitor 203. The source S of the FET 202 is grounded, the drain D is connected to the cathode of the organic EL element 205,
It is connected to a power supply through the anode of the L element 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
T201のゲートGにオン電圧が供給されると、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。
The light emission control operation of the unit pixel of the display panel 109 in which a plurality of such circuits are arranged in rows and columns is performed by FE
When the ON voltage is supplied to the gate G of T201, the FET
201 flows 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
01のドレインDはオープン状態となる。従って、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
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
へ流れ、有機EL素子205を発光せしめる。
When the gate G of the FET 201 is at an off voltage, the FET 201 is cut off,
01 is in the open state. Therefore, FE
During the period when the gate G of T201 is on voltage, the capacitor 203 is charged with a current based on the voltage of the source S, and the voltage is supplied to the gate G of the FET 202 and
2, a current based on the gate voltage and a voltage applied to the drain D supplied from the power supply through the organic EL element 205 is supplied from the drain D to the source S through the organic EL element 205.
To make the organic EL element 205 emit light.

【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
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
素子205の発光も維持される。
When the gate G of the FET 201 is turned off, the FET 201 is opened and the FET 202 is turned off.
Indicates that the voltage of the gate G is held by the charge accumulated in the capacitor 203, the current is maintained until the next scan,
Light emission of the element 205 is also maintained.

【0018】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20
3を省略しても上記と同様の動作が可能である。
The gate G and the source S of the FET 202
Since there is a gate input capacitance between them, the capacitor 20
Even if 3 is omitted, the same operation as above can be performed.

【0019】上記した例では、FET201のソース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。
In the above example, the source S of the FET 201
The case where the light emission luminance of the organic EL element is controlled based on the voltage according to the digital luminance gradation supplied to the FET 201 has been described, but the voltage supplied to the source S of the FET 201 is binary digital data, and the light emission time is controlled. A so-called sub-field method for controlling and representing a luminance gradation is also known.

【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。
That is, in the subfield method, one frame or one field is divided into several subfields corresponding to the luminance gradation, a predetermined light emission time is allocated to each subfield, and a combination of each subfield is controlled. This is a method of expressing a luminance gradation by realizing different light emission times.

【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。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。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。そして、長時間発光し続けると有機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。
In the related art, there has been known a driving method in which a luminance gradation is obtained by weighting a light emission time in a unit time, such as a subfield method, in obtaining a luminance gradation. In this method, the gradation cannot be accurately represented unless the instantaneous luminance of each organic EL element forming the matrix is constant. On the other hand, an organic EL element is a current-controlled light-emitting element, that is, an element that shows light emission intensity proportional to a current value. And if the light emission continues for a long time, the organic E
The organic EL element has a characteristic that the physical property of the L element changes and the resistance value of the organic EL element itself 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。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
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。
Further, since the emission frequency of each organic EL element is usually different, if the display device is driven for a long time, the resistance value of each organic EL element will be different, and the instantaneous luminance of each organic EL element will also be different. Would. As a result, not only the luminance gradation faithful to the input video signal cannot be expressed, but also the ratio of the error with respect to the correct luminance gradation to be displayed by each organic EL.
Since variations occur for each element, the luminance appears unevenly 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。
In order to solve this problem, it is necessary to control the driving so that the current value flowing through each organic EL element becomes constant even if the element resistance of the organic EL element changes with time. A method is conceivable in which a constant current circuit is provided so that the current flowing through each organic EL element becomes constant.

【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。
In the active matrix driving panel described above, the characteristic that the resistance value of the FET is larger than the resistance value of the organic EL element so that the current value flowing through the organic EL element is determined by the resistance value of the FET itself. By using it under the conditions (see FIG. 3), it can be used also 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。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。
However, in this case, there is a problem that power consumption is increased. Further, if the resistance value of the FET provided for each organic EL element varies, the current value flowing through each organic EL element also varies, and the instantaneous luminance of each organic EL element cannot be made constant.

【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。
The present invention solves the above-described problem in the case where the luminance gradation is expressed by weighting the light emission time within a unit time, such as a subfield method, in an organic EL display device driven by a matrix. .

【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。
An object of the present invention is to prevent the occurrence of uneven brightness on the screen due to the variation in instantaneous brightness of each organic EL element, and to correct this by adjusting the light emission time within one frame period. Things.

【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-mentioned problems, the invention according to claim 1 is directed to a matrix in which a plurality of pixels each formed by a light-emitting element using an organic electroluminescence element form a row and a column. An organic electroluminescence display device for driving an array of display panels in an active matrix, comprising: a measuring unit for measuring a current value flowing through each light emitting element when each light emitting element is driven at a predetermined voltage value; Means for storing a current value measured by the means, and a desired light emission within one frame period using the current value stored by the storage means and luminance data representing the light emission luminance of the light emitting element inputted from outside. Calculating means for calculating time.

【0029】また、請求項2に記載の発明は、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。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。
[0029] The invention described in claim 2 is the same as that in claim 1.
Wherein the measurement by the measuring means is performed in response to a command to turn off the power of the display device. According to a third aspect of the present invention, there is provided the organic electroluminescent display device according to the first or second aspect, wherein the arithmetic means determines a current value flowing through the light emitting element based on a current value flowing through each light emitting element. Calculate the relative value by dividing by a relative value, and further calculate the desired light emitting time within one frame period by dividing the light emitting time within one frame period indicated by the luminance data by the relative value. It is characterized by.

【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。
According to a fourth aspect of the present invention, there is provided an active matrix driving method for a display panel in which a plurality of pixels each formed by a light emitting element using an organic electroluminescence element are arranged in a matrix so as to form rows and columns. A method of driving an organic electroluminescent display device, wherein each of the light emitting elements is driven at a predetermined constant voltage, and a current value flowing through each of the light emitting elements at that time is stored to correspond to each light emitting element inputted from the outside. The luminance data to be calculated is calculated using the current value to obtain a desired light emission time within one frame period, and each of the light emitting elements is driven for the light emission time.

【0031】また、請求項5に記載の発明は、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。また、
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 described in claim 5 is the same as the invention described in claim 4.
Wherein the measurement by the measuring means is performed in response to a command to turn off the power of the display device. Also,
According to a sixth aspect of the present invention, there is provided the driving method of the organic electroluminescence display device according to the fourth or fifth aspect, wherein the arithmetic unit determines a current flowing through the light emitting element based on a current value flowing through each light emitting element. A relative value is obtained by calculation by dividing by a value, and a desired light emitting time within one frame period is obtained by calculation by dividing the light emitting time within one frame period indicated by the luminance data by the relative value. It is characterized by the following.

【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、
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。従って、画面に輝度むらが生じることのない有機E
L表示装置を提供することができる。
As described above, according to the present invention, even when the degree of deterioration of the instantaneous luminance of each organic EL element varies due to long-time driving, when viewed in frame units,
Variations in the rate of luminance degradation for each organic EL element are eliminated. Therefore, the organic E which does not cause uneven brightness on the screen
An L display device can be provided.

【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。
According to a first aspect of the present invention, in the organic electroluminescence display device, a measuring means for measuring a current value flowing through each light emitting element when the light emitting element as each organic EL element is driven at a predetermined voltage value. A storage unit for storing a current value measured by the measurement unit, and a luminance value representing the light emission luminance of the light emitting element input from the outside using the current value stored by the storage unit and a desired value within one frame period. And a calculation means for calculating the light emission time of the light emitting element, 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。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。
According to the second aspect of the present invention, the measurement by the measuring means is performed in response to a command to turn off the power of the display device. Occurs at the end of the display operation. According to a third aspect of the present invention, the calculating means obtains a relative value by calculation by dividing a current value flowing through each light emitting element by a current value flowing through a reference light emitting element.
By dividing the light emission time in one frame period indicated by the luminance data by the relative value, the desired light emission time in one frame period is obtained by calculation. The correction can be made based on the light emission time of the light emitting element as a reference.

【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。
According to a fourth aspect of the present invention, there is provided a method for driving an organic electroluminescence display device, wherein each of the light emitting elements is driven at a predetermined constant voltage and the current value flowing through each of the light emitting elements at that time is reduced. The luminance data corresponding to each light-emitting element, which is stored from outside and is calculated from the current value, is calculated using a current value, a desired light-emitting time within one frame period is obtained, and each of the light-emitting elements can be driven for 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。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。
According to a fifth aspect of the present invention, the measurement by the measuring means is performed in accordance with a command to turn off the power of the display device. Light emission occurs at the end of the display operation. According to a sixth aspect of the present invention, the calculating means obtains a relative value by calculation by dividing a current value flowing through each light emitting element by a current value flowing through the reference light emitting element, and further calculates the relative value. Since the desired light emission time within one frame period is obtained by calculation by dividing the light emission time within one frame period shown by the relative value, the light emission based on the light emission time of the light emitting element not used as a reference is used. The correction can be made 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。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。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An organic EL display according to the present invention and a method for driving the same will be described in detail with reference to FIGS. FIG. 1 is a block diagram showing a configuration of an organic EL display device according to the present invention, FIG. 2 is a diagram showing a configuration example of a light emission control circuit corresponding to a unit pixel of the organic EL display device, and FIG. 3 is a FET used in FIG. FIG. 6 is a diagram showing characteristics of the present invention.

【0038】図1において、101はA/D変換回路、
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
は表示パネルを示す。
In FIG. 1, reference numeral 101 denotes an A / D conversion circuit;
102 is an arithmetic circuit, 103 is a frame memory, 104 is a controller, 105 is a scanning circuit, 106 is a writing circuit, 107 is a power supply circuit, 108 is a current value memory, 109
Indicates a 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。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。この演算処
理については後述する。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 A / D conversion circuit 101 receives an analog video signal input and converts it into digital video signal data. The converted digital video signal is supplied from the A / D conversion circuit 101 to the arithmetic circuit 102, subjected to arithmetic processing under the control of the controller 104 based on the data from the current value memory 108, and supplied to the frame memory 103. Is written and stored under the control of. This calculation process will be described later. The controller 104 controls each circuit of the frame memory 103 and other power supply circuits 107 in synchronization with the horizontal and vertical synchronization 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。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。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。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
によって制御される。
The digital video signal data stored in the frame memory 103 is read by the controller 104 and sent to the writing circuit 106. In addition, by sequentially controlling the writing circuit 106 and the scanning circuit 105 connected to each row and column of the display panel by the controller 104, the light emission time of the organic EL element of the display panel 109 corresponding to the image stored in the frame memory. Is controlled by, for example, the subfield method or the like to obtain a desired image display. The power supply circuit 107 supplies power to all the organic EL elements of the display panel 109 and is controlled by the controller 104. The current value memory 108 stores a value corresponding to a drive current of an organic EL element as each organic EL element of the display panel 109,
Is controlled by

【0041】ここで前記した演算処理について説明す
る。上述したように電流値メモリ108には各有機EL
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。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。
Here, the above-described arithmetic processing will be described. As described above, each organic EL is stored in the current value memory 108.
It is stored when a value corresponding to the drive current of the element is instructed by the controller 104. For example, before turning off the power of the display device, the controller 104 performs light emission control corresponding to the same luminance data on all the organic EL elements of the display panel 109.

【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。各有機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。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。
This means that all the organic EL elements of the display panel 109 are driven at the same constant voltage. Each organic E
The L elements exhibit different light emission currents even when driven at the same voltage if the light emission luminance characteristics with respect to the drive current are different. Usually, the organic EL element that emits light with high luminance frequently deteriorates in light emission luminance characteristics more than other organic EL elements, and the light emission current in the case of the constant voltage driving is smaller than that of 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
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。
Accordingly, the drive current of the other organic EL element is corrected based on the light emission current of the organic EL element which has the largest deterioration in the light emission luminance characteristic, and the light emission time of the organic EL element is corrected based on the corrected light emission gradation data. Display panel 1 by controlling
09, it is possible to obtain an image display in which the light emitting state of all the organic EL elements is exactly proportional to the input video signal.

【0044】上述したような方法でコントローラ104
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。
In the manner described above, the controller 104
A current value for correction is stored in the current value memory 108 in accordance with the control of (1), and then the arithmetic circuit 102 reads a predetermined stored current value in accordance with the control of the controller 104, for example, the light emission of each organic EL element described above. By dividing the current by the minimum reference value, the ratio with respect to the reference value is obtained by calculation as a correction value of the luminance data.

【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。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。
The obtained correction value becomes 1 or more by using the minimum value of the light emission current as a reference value. By dividing the input digital video signal data to the arithmetic circuit 102 by the obtained correction value for each pixel, the digital video signal data is supplied to the frame memory 103 as corrected digital video signal data.

【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。
That is, since the correction value is a value of 1 or more, the corrected luminance data corresponding to the organic EL element having the minimum current value among the current values stored in the current value memory does not change. The luminance data corresponding to the EL element will be smaller than the original luminance data.

【0047】もちろん電流値メモリ108の最小値が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。
Of course, the minimum value of the current value memory 108 is 0
In the case of (1) or abnormally small, normal correction cannot be performed, and a means for removing this will be provided as described later.

【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。図2において、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
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。
Next, an example of a circuit configuration corresponding to a unit pixel of the display panel 109 is shown in FIG. In FIG. 2, the FET
The gate G of 201 forms a scanning electrode line to which a scanning signal for scanning a row from the scanning circuit 105 is supplied.
The source S of T201 forms a data electrode line to which a signal corresponding to data of the frame memory 103 from the writing circuit 106 is supplied.

【0049】FET201のドレインDは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。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 drain D of the FET 201 is
, And grounded through a capacitor 203. The source S of the FET 202 is grounded, the drain D is connected to the cathode of the organic EL element 205 through a current detector 204 as current measuring means, and is 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
T201のゲートGにオン電圧が供給されると、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。
The light emission control operation of the unit pixel of the display panel 109 in which a plurality of such circuits are arranged in rows and columns is performed by FE
When the ON voltage is supplied to the gate G of T201, the FET
201 flows 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
01のドレインDはオープン状態となる。従って、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
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。
When the gate G of the FET 201 is at an off-voltage, the FET 201 is cut off,
01 is in the open state. Therefore, FE
During the period when the gate G of T201 is on voltage, the capacitor 203 is charged with a current based on the voltage of the source S, and the voltage is supplied to the gate G of the FET 202 and
Reference numeral 2 indicates that a current based on the gate voltage and a voltage applied to the drain D supplied from the power supply through the organic EL element 205 flows from the drain D to the source S through the organic EL element 205 and the current detector 204, and the organic EL element 205 emits light. Let me know.

【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
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
素子205の発光も維持される。
When the gate G of the FET 201 is turned off, the FET 201 is opened and the FET 202 is turned off.
Indicates that the voltage of the gate G is held by the charge accumulated in the capacitor 203, the current is maintained until the next scan,
Light emission of the element 205 is also maintained.

【0053】電流検出器204は、有機EL素子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。電流検出器20
4は、FET202のソースと接地の間に設けても良
い。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。
The current detector 204 includes an organic EL element 205
Are connected in series with each other, a current flowing through the organic EL element 205 is detected, and stored in the current value memory 207 as digital data by the A / D conversion circuit 206. Current detector 20
4 may be provided between the source of the FET 202 and the ground. Since there is a gate input capacitance between the gate G and the source S of the FET 202, the same operation as described above is possible even if the capacitor 203 is omitted, as in the related art.

【0054】以上説明したように、電流値メモリ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。
As described above, the current value memory 108
By providing the arithmetic circuit 102 and performing the above-described processing, it is possible to obtain an image display in which the light emission states of all the organic EL elements of the display panel 109 are accurately proportional to the input video signal. If the minimum value of the current value data in the memory 108 is used as the reference value, the emission intensity of the organic EL element after the correction is controlled so as to be lower than the case where no correction is performed. The risk of overflow can be avoided.

【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
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。
If there is a defective organic EL element whose reference value is 0 or the like, the arithmetic circuit 102 stores the current value memory 1
When reading data from 08, abnormal values are removed by replacing data indicating extremely deviated values with predetermined values, or abnormal values are corrected by obtaining an average value or variance by sampling in advance. And so on.

【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。
The light emission time can be controlled by so-called pulse width modulation in the case of the simple matrix drive described above, and by the subfield method in the case of active matrix drive using a TFT (Thin Film Transistor). Can be done with

【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。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、
消費電力の低下をも図ることができる。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。
The object of the present invention described above is based on the premise that each organic EL element of the display panel 109 has the same light emission luminance under the same driving current. Based on this premise, it is also possible to use a constant current circuit. Although this can be achieved, the problem of power consumption as described above occurs. According to the present invention, it is not necessary for the FET to have the function of a constant current circuit, and the FET can set the condition of the use characteristic so as to use only the function of the switching element (point b in FIG. 3).
Power consumption can also be reduced. FIG. 3 shows an example of a voltage-current characteristic between the source and the drain of the FET shown in FIG.

【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
ETのソース−ドレイン間に流れる電流Isdを示す。
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。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。
In FIG. 3, the horizontal axis represents the voltage Vsd between the source and the drain of the FET, and the vertical axis represents F corresponding to the voltage on the horizontal axis.
The current Isd flowing between the source and the drain of the ET is shown.
Vg1 to Vg3 represent gate voltages between the gate and the source, and have a relationship of Vg3>Vg2> Vg1. Point b relatively shows the operating point when it is used as the above-described switching element, and point a shows the operating point when it is used as the above-described constant current circuit.

【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。
In the above example, the measurement of the emission current of each organic EL element is performed before the power of the display device is turned off under the control of the controller 104. However, the measurement is performed when the power of the display device is turned on. It may be performed at predetermined time intervals as long as a timer is built in, or may be performed at predetermined times according to the number of times the display device is turned on.

【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。
In any case, when the current value is stored in the current value memory, all the organic EL elements of the display panel are driven at the same voltage, so that the entire surface emits light with substantially the same luminance. It is appropriate to measure and store the current when performing the operation.

【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、
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。
Further, if the organic EL element of the display panel is divided into, for example, a comment display block provided at the lower right corner and another main display portion, and the current is measured and stored in a temporally divided manner,
A part of the display panel can be used for displaying the current storage mode or the like.

【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。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。
Although the description has been made so that the current value is stored in the current value memory, a resistance value or the like may be used as long as the current value is proportional to the current value. In addition, the first value of the reference value is stored in an appropriate memory as an initial reference value, and the reference value in each case is compared with the initial reference value to control the driving power supply voltage itself, thereby covering the entire display panel. It is also possible to control the luminance and maintain a stable luminance.

【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。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。
As described above, according to the present invention, even when the degree of deterioration of the instantaneous luminance of each organic EL element varies due to long-time driving, when viewed in frame units, Variations in the rate of luminance degradation for each EL element are eliminated. Therefore, it is possible to provide an organic EL display device in which luminance unevenness does not occur on a 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。
According to a first aspect of the present invention, in the organic electroluminescence display device, a measuring means for measuring a current value flowing through each light emitting element when the light emitting element as each organic EL element is driven at a predetermined voltage value. A storage unit for storing a current value measured by the measurement unit, and a luminance value representing the light emission luminance of the light emitting element input from the outside using the current value stored by the storage unit and a desired value within one frame period. And a calculation means for calculating the light emission time of the light emitting element. Therefore, it is possible to provide an organic EL display device that does not cause uneven brightness on the 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。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
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、
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。
According to the second aspect of the present invention, the measurement by the measuring means is performed in response to a command to turn off the power of the display device. This phenomenon occurs at the end of the display operation, so that the effect of the phenomenon at the time of current measurement on the display operation can be reduced. According to a third aspect of the present invention, the calculation means obtains a relative value by calculation by dividing a current value flowing through each light emitting element by a current value flowing through a reference light emitting element, and further calculates the relative value. By dividing the light emission time within the indicated one frame period by the relative value, 1
Since the desired light emission time in the frame period is obtained by calculation, it can be corrected based on the light emission time of the light emitting element based on the light emission time of the light emitting element that is not a reference,
It is possible to provide an organic EL display device in which luminance unevenness does not occur on a 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。
According to a fourth aspect of the present invention, there is provided a method of driving an organic electroluminescence display device, wherein each of the light emitting elements is driven at a predetermined constant voltage and the current value flowing through each of the light emitting elements at that time is reduced. Since the stored luminance data corresponding to each light emitting element input from the outside is calculated using the current value to obtain a desired light emitting time within one frame period, each of the light emitting elements is driven for the light emitting time. In addition, it is possible to provide an organic EL display device in which luminance unevenness does not occur on a 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。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。
According to a fifth aspect of the present invention, the measurement by the measuring means is performed in accordance with a command to turn off the power of the display device. Since the phenomenon of light emission is performed at the end of the display operation, the effect of the phenomenon at the time of current measurement on the display operation can be reduced. The invention described in claim 6 is
The calculating means calculates the relative value by dividing the current value flowing through each light emitting element by the current value flowing through the reference light emitting element, and further calculates the light emitting time within one frame period indicated by the luminance data. By dividing by a relative value, a desired light emitting time within one frame period is obtained by calculation, so that it is possible to correct based on the light emitting time of the light emitting element based on the light emitting time of the light emitting element that is not a reference, It is possible to provide an organic EL display device in which luminance unevenness does not occur on a 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。
FIG. 1 is a block diagram illustrating a configuration of an organic EL display device according to the present invention.

【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。
FIG. 2 is a diagram illustrating a configuration example of a light emission control circuit corresponding to a unit pixel of the organic EL display device according to the present invention.

【図3】本発明における発光制御回路に使用するFET
の特性例を示す図である。
FIG. 3 is an FET used in a light emission control circuit according to the present invention.
FIG. 4 is a diagram showing an example of the characteristics of FIG.

【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。
FIG. 4 is a block diagram illustrating a configuration 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。
FIG. 5 is a diagram illustrating a characteristic example of an FET used in a 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。FIG. 6 shows a schematic configuration of an organic EL element.

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

【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。
FIG. 8 is a diagram showing a simple matrix driving method of an organic EL element.

【符号の説明】[Explanation 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 Operation circuit 103 Frame memory 104 Controller 105 Scan circuit 106 Write circuit 107 Power supply Circuit 108 Current memory 109 Display panel 201 FET 202 FET 203 Capacitor 204 Current detector 205 Organic EL element 206 ··· A / D conversion circuit 207 ··· Current value memory

Claims (6)

【特許請求の範囲】[Claims] 【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
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。
1. An organic electroluminescence display device for driving a display panel, which is constituted by arranging a plurality of pixels each formed of a light emitting element by an organic electroluminescence element in a matrix so as to form rows and columns, in an active matrix manner. Measuring means for measuring a current value flowing through each of the light emitting elements when each of the light emitting elements is driven at a predetermined voltage value; storage means for storing the current value measured by the measuring means; Using the current value stored in the step S1 and luminance data representing the light emission luminance of the light emitting element input from the outside,
An organic electroluminescence display device comprising: a calculation unit for calculating a desired light emission time within a frame period.
【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。
2. The organic electroluminescent display device according to claim 1, wherein the measurement by the measuring means is performed in response to a command to turn off the power of the display device.
【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。
3. The arithmetic unit calculates a relative value by dividing a current value flowing through each of the light emitting elements by a current value flowing through a reference light emitting element, and further calculates a relative value. The organic electroluminescence display device according to claim 1, wherein a desired light emission time in one frame period is obtained by calculation by dividing a light emission time in one frame period by the relative value.
【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 of driving an organic electroluminescence display device, which performs active matrix driving of a display panel in which a plurality of pixels each formed of a light emitting element by an organic electroluminescence element are arranged in a matrix so as to form rows and columns. And driving each of the light emitting elements at a predetermined constant voltage and storing a current value flowing through each of the light emitting elements at that time, and outputting brightness data corresponding to each of the light emitting elements input from the outside to the current. A method for driving an organic electroluminescent display device, wherein a desired light emission time within one frame period is obtained by calculating using a value, and each of the light emitting elements is driven for the light emission time.
【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。
5. The driving method for an organic electroluminescence display device according to claim 4, wherein the measurement by the measurement unit is performed in response to a command to turn off the power of the display device.
【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。
6. The calculation means calculates a relative value by dividing a current value flowing through each of the light emitting elements by a current value flowing through a reference light emitting element, and further calculates a relative value. The driving of the organic electroluminescent display device according to claim 4, wherein a desired light emitting time in one frame period is obtained by calculation by dividing a light emitting time in one frame period by the relative value. Method.
JP9076533A 1997-03-12 1997-03-12 Organic electroluminescent display device, and driving method therefor Pending JPH10254410A (en)

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