JP2914234B2

JP2914234B2 - EL display device

Info

Publication number: JP2914234B2
Application number: JP20634595A
Authority: JP
Inventors: 弘之木下; 雅彦長田; 啓明氷見; 信衛伊藤; 服部　　正
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 1995-08-11
Filing date: 1995-08-11
Publication date: 1999-06-28
Anticipated expiration: 2015-08-11
Also published as: JPH0954566A

Description

DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ＥＬ（エレクトロ
ルミネッセンス）素子を発光駆動して表示を行うＥＬ表
示装置に関する。[0001] 1. Field of the Invention [0002] The present invention relates to an EL (electroluminescence) display device which performs display by driving a light emitting element.

【０００２】[0002]

【従来の技術】従来、ＥＬ素子の発光駆動を行う回路と
して特開平５ー３３３８１５号公報に示すものがある。
このものにおいては、ＥＬ素子をマトリクス配置し、走
査側およびデータ側にそれぞれ走査側ドライバＩＣ、デ
ータ側ドライバＩＣを備えている。そして、それぞれの
ドライバＩＣにより、正負のフィールド毎に極性の異な
る駆動電圧パルスをＥＬ素子に印加して発光させるよう
にしている。2. Description of the Related Art Conventionally, there is a circuit disclosed in JP-A-5-333815 as a circuit for driving light emission of an EL element.
In this device, EL elements are arranged in a matrix, and a scanning driver IC and a data driver IC are provided on the scanning side and the data side, respectively. Each driver IC applies a drive voltage pulse having a different polarity to the EL element for each of the positive and negative fields to emit light.

【０００３】すなわち、正フィールドにおいては、走査
側ドライバＩＣから、接地電圧（０Ｖ）を基準電圧と
し、走査電極にＥＬ駆動電圧に相当する電圧（Ｖｒとす
る）を出力し、データドライバＩＣから、発光させるＥ
Ｌ素子には接地電圧を、非発光状態とするＥＬ素子には
変調電圧（Ｖｍとする）をデータ電極に出力して、Ｖｒ
の電圧が出力された走査電極に対しデータ電極の電圧を
接地電圧として、ＥＬ素子にＶｒの電圧を印加して発光
させるようにしている。That is, in the positive field, a voltage (Vr) corresponding to the EL drive voltage is output from the scanning driver IC to the scanning electrode using the ground voltage (0 V) as a reference voltage, and the data driver IC outputs E to emit light
The ground voltage is output to the L element, and the modulation voltage (Vm) is output to the data electrode to the EL element to be in a non-light emitting state.
The voltage of the data electrode is set to the ground voltage with respect to the scan electrode to which the voltage is output, and a voltage of Vr is applied to the EL element to emit light.

【０００４】また、負フィールドにおいては、走査側ド
ライバＩＣから、接地電圧（０Ｖ）を基準電圧とし、走
査電極に−Ｖｒ＋Ｖｍの電圧を出力し、データドライバ
ＩＣから、発光させるＥＬ素子には変調電圧Ｖｍを、非
発光状態とするＥＬ素子には接地電圧をデータ電極に出
力して、−Ｖｒ＋Ｖｍの電圧が出力された走査電極に対
しデータ電極の電圧を変調電圧Ｖｍとして、ＥＬ素子に
−Ｖｒの電圧を印加して発光させるようにしている。In a negative field, a ground voltage (0 V) is used as a reference voltage from a scanning driver IC, a voltage of -Vr + Vm is output to a scanning electrode, and a modulation voltage is applied to an EL element to emit light from the data driver IC. Vm, the ground voltage is output to the data electrode for the EL element to be in the non-light emitting state, and the voltage of the data electrode is set to the modulation voltage Vm for the scanning electrode to which the voltage of -Vr + Vm is output. Light is emitted by applying a voltage.

【０００５】[0005]

【発明が解決しようとする課題】上記のような駆動を行
う場合、走査側ドライバＩＣの電源電圧は、正フィール
ドの駆動ではＶｒと接地電圧となるため、走査側ドライ
バＩＣにはＶｒの電圧がかかり、従ってその耐圧をＶｒ
以上とする必要がある。ＥＬ素子は比較的高電圧で駆動
され、Ｖｒとしては例えば２６０Ｖ程度となるため、走
査側ドライバＩＣとしては高耐圧のものが必要となる。
汎用のドライバＩＣではそのような高耐圧に設定されて
いないため、上記のような構成とするためには特別に高
耐圧ドライバＩＣを設計する必要があり、集積化、低コ
スト化の点で問題がある。In the case of performing the driving described above, the power supply voltage of the scanning driver IC becomes Vr and the ground voltage in the driving of the positive field, so that the voltage of Vr is applied to the scanning driver IC. And the withstand voltage is Vr
It is necessary to do above. Since the EL element is driven at a relatively high voltage and has a Vr of, for example, about 260 V, a scanning-side driver IC having a high withstand voltage is required.
Since a general-purpose driver IC is not set to such a high withstand voltage, it is necessary to specifically design a high withstand voltage driver IC in order to achieve the above configuration, which is a problem in terms of integration and cost reduction. There is.

【０００６】また、データ側ドライバＩＣにおいても同
様である。本発明は上記問題に鑑みたもので、ＥＬ素子
の駆動回路を低耐圧のものとしてもＥＬ素子の駆動を行
うことができるようにすることを目的とする。The same applies to the data side driver IC. The present invention has been made in view of the above problems, and has as its object to drive an EL element even when the driving circuit of the EL element has a low withstand voltage.

【０００７】[0007]

【発明の概要】上記目的を達成するため、本発明は、正
負のフィールド毎に異なる極性にて走査電圧を印加し
て、ＥＬ素子を発光させるようにしたＥＬ表示装置にお
いて、電圧供給回路より、正のフィールドにおいて正極
性の走査電圧と接地レベルより高い第１のオフセット電
圧を走査電極駆動回路に供給し、走査電極駆動回路は、
正のフィールドにおいて走査電極の電圧を第１のオフセ
ット電圧にするとともに発光タイミング時に走査電極に
正極性の走査電圧を出力するようにした点を第１の特徴
としている。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an EL display device in which a scanning voltage is applied with a different polarity for each of positive and negative fields to cause an EL element to emit light. In a positive field, a positive scan voltage and a first offset voltage higher than the ground level are supplied to the scan electrode drive circuit, and the scan electrode drive circuit includes:
The first feature is that the voltage of the scan electrode is set to the first offset voltage in the positive field and a positive scan voltage is output to the scan electrode at the light emission timing.

【０００８】従って、走査電極駆動回路に供給される電
圧を第１のオフセット電圧分だけ従来のものに比べて低
くすることができるため、走査電極駆動回路の耐圧を低
く抑えることができる。また、本発明は、電圧供給回路
より、ＥＬ素子の発光／非発光を決定する変調電圧と、
接地レベルより高い第２のオフセット電圧をデータ電極
駆動回路に供給し、データ電極駆動回路は、負のフィー
ルドにおいて、発光状態とするＥＬ素子のデータ電極に
対してはその電圧を変調電圧とし、非発光状態とするＥ
Ｌ素子のデータ電極に対してはその電圧を第２のオフセ
ット電圧とするようにした点を第２の特徴としている。Accordingly, the voltage supplied to the scan electrode drive circuit can be reduced by the first offset voltage as compared with the conventional one, so that the withstand voltage of the scan electrode drive circuit can be suppressed low. Also, the present invention provides a modulation voltage for determining light emission / non-light emission of an EL element by a voltage supply circuit;
A second offset voltage higher than the ground level is supplied to the data electrode drive circuit, and the data electrode drive circuit uses the voltage as a modulation voltage for the data electrode of the EL element that is to emit light in the negative field, E to emit light
A second feature is that the voltage of the data electrode of the L element is set as a second offset voltage.

【０００９】従って、データ電極駆動回路に供給される
電圧を第２のオフセット電圧分だけ従来のものに比べて
低くすることができるため、データ電極駆動回路の耐圧
を低下させることができる。また、本発明は、電圧供給
回路より、正の極性の駆動電圧パルスを発生させるため
の駆動電圧と、接地レベルより高い第１のオフセット電
圧を第１、第２の駆動回路の両方に供給して、発光駆動
を行うようにした点を第３の特徴としている。Therefore, the voltage supplied to the data electrode drive circuit can be reduced by the second offset voltage as compared with the prior art, so that the withstand voltage of the data electrode drive circuit can be reduced. Further, according to the present invention, a voltage supply circuit supplies a drive voltage for generating a drive voltage pulse of a positive polarity and a first offset voltage higher than a ground level to both the first and second drive circuits. The third feature is that light emission driving is performed.

【００１０】このことにより、マトリクス表示を行うＥ
Ｌ表示装置に限らず、セグメント表示、バックライト等
を行うＥＬ表示装置においても、上記したのと同様に駆
動回路の耐圧を低下させることができ、これまでＶ_O1、
Ｖｍと２つ必要だった電源を１つにし低コスト化を行う
ことができる。さらに、本発明は、電圧供給回路から供
給された電圧に基づき、一対の電極のうちの一方の電極
の電圧を、ＥＬ素子を発光させるタイミング時には発光
用の駆動電圧とし、それ以外の期間は発光用の駆動電圧
と接地電圧との間の電圧レベルを有するオフセット電圧
として、駆動するようにした点を第４の特徴としてい
る。As a result, the matrix display E
Is not limited to the L display, a segment display, even in the EL display device which performs backlights, it is possible to lower the withstand voltage of the same drive circuit to that described above, heretofore V _O1,
Vm and two required power supplies can be reduced to one to reduce cost. Further, according to the present invention, based on the voltage supplied from the voltage supply circuit, the voltage of one of the pair of electrodes is set to a drive voltage for light emission at the timing of causing the EL element to emit light, and light emission is performed during other periods. A fourth feature is that the driving is performed as an offset voltage having a voltage level between the driving voltage for use and the ground voltage.

【００１１】このことにより、上記第３の特徴と同様、
マトリクス表示、セグメント表示、バックライト等のＥ
Ｌ表示装置において、駆動回路の耐圧を低く抑えること
ができる。Thus, similar to the third feature,
E for matrix display, segment display, backlight, etc.
In the L display device, the withstand voltage of the driving circuit can be suppressed low.

【００１２】以下、本発明を図に示す実施例について説
明する。（第１実施形態）図２にＥＬ素子の模式的な断面構成を示す。ＥＬ素子１
００は、ガラス基板１０１上に積層形成された、透明電
極１０２、第１絶縁層１０３、発光層１０４、第２絶縁
層１０５、背面電極１０６から構成されており、透明電
極１０２、背面電極１０６間に交流の駆動電圧パルスが
印加されて発光する。そして、この図２では、ガラス基
板１０１より光を取り出すようにしている。なお、背面
電極１０６を透明電極とすれば図の上下の両方向から光
を取り出すことができる。The present invention will be described below with reference to an embodiment shown in the drawings. First Embodiment FIG. 2 shows a schematic sectional configuration of an EL element. EL element 1
Reference numeral 00 denotes a transparent electrode 102, a first insulating layer 103, a light emitting layer 104, a second insulating layer 105, and a back electrode 106, which are stacked and formed on a glass substrate 101. Is applied with an AC driving voltage pulse to emit light. Then, in FIG. 2, so that light is extracted from the glass substrate 10 1. If the back electrode 106 is a transparent electrode, light can be extracted from both the upper and lower directions in the figure.

【００１３】図１に本発明の第１実施形態を示すＥＬ表
示装置の全体構成を示す。本実施形態におけるＥＬ表示
パネル１は、図２に示す構成に対し、透明電極１０２、
背面電極１０６を行列上に複数配置して走査電極および
データ電極とし、マトリクス表示を行うように構成され
ている。具体的には、図１に示すように、行方向に奇数
走査電極２０１、２０２、…、偶数走査電極３０１、３
０２、…が形成され、列方向にデータ電極４０１、４０
２、４０３、…が形成されている。FIG. 1 shows the overall structure of an EL display device according to a first embodiment of the present invention. The EL display panel 1 according to the present embodiment differs from the configuration shown in FIG.
A plurality of back electrodes 106 are arranged in a matrix to form a scanning electrode and a data electrode to perform matrix display. Specifically, as shown in FIG. 1, the odd-numbered scan electrodes 201, 202,.
.. Are formed, and the data electrodes 401, 40 are arranged in the column direction.
2, 403,... Are formed.

【００１４】走査電極２０１、３０１、２０２、３０
２、…とデータ電極４０１、４０２、４０３、…とのそ
れぞれの交差領域には、画素としてのＥＬ素子１１１、
１１２、…１２１、…が形成されている。なお、ＥＬ素
子は容量性の素子であるため、図ではコンデンサの記号
で表している。このＥＬ表示パネル１の表示駆動を行う
ために、走査側ドライバＩＣ２、３およびデータ側ドラ
イバＩＣ４が設けられている。Scan electrodes 201, 301, 202, 30
.. And the data electrodes 401, 402, 403,.
.., 121,... Are formed. Since the EL element is a capacitive element, it is represented by a capacitor symbol in the figure. To perform display driving of the EL display panel 1, scanning driver ICs 2 and 3 and a data driver IC 4 are provided.

【００１５】走査側ドライバＩＣ２は、プッシュプルタ
イプの駆動回路であり、奇数走査電極２０１、２０２、
…に接続されたＰチャンネルＦＥＴ２１ａ、２２ａ、…
とＮチャンネルＦＥＴ２１ｂ、２２ｂ、…を有し、制御
回路２０からの出力に従って奇数走査電極２０１、２０
２、…に走査電圧を印加する。また、ＦＥＴ２１ａ、２
１ｂ、２２ａ、２２ｂ、…のそれぞれには、寄生ダイオ
ード２１ｃ、２１ｄ、２２ｃ、２２ｄ、…が形成されて
おり、走査電極を所望の基準電圧に設定する。The scanning-side driver IC 2 is a push-pull type driving circuit, and includes odd-numbered scanning electrodes 201, 202,
, Connected to the P-channel FETs 21a, 22a,.
, And N-channel FETs 21b, 22b,..., And odd scan electrodes 201, 20 according to the output from the control circuit 20.
A scanning voltage is applied to 2,. In addition, FETs 21a, 2
Parasitic diodes 21c, 21d, 22c, 22d,... Are formed in each of 1b, 22a, 22b,.

【００１６】走査側ドライバＩＣ３も同様の構成で、制
御回路３０、ＰチャンネルＦＥＴ３１ａ、３２ａ、…と
ＮチャンネルＦＥＴ３１ｂ、３２ｂ、…を有して、偶数
走査電極３０１、３０２、…に走査電圧を供給する。デ
ータ側ドライバＩＣ４も同様に、制御回路４０、Ｐチャ
ンネルＦＥＴ４１ａ、４２ａ、…とＮチャンネルＦＥＴ
４１ｂ、４２ｂ、…を有して、データ電極４０１、４０
２、４０３、…にデータ電圧を供給する。The scanning driver IC 3 has the same configuration, has a control circuit 30, P-channel FETs 31a, 32a,... And N-channel FETs 31b, 32b,... And supplies a scanning voltage to the even-numbered scanning electrodes 301, 302,. I do. Similarly, the data side driver IC 4 includes a control circuit 40, P-channel FETs 41a, 42a,.
41b, 42b,...
, 403,...

【００１７】走査側ドライバＩＣ２、３には、走査電圧
を供給するための走査電圧供給回路５、６が設けられて
いる。走査電圧供給回路５は、スイッチング素子５１、
５２を有し、そのオンオフ状態に応じて、直流電圧（書
き込み電圧）Ｖｒまたは接地電圧を、走査側ドライバＩ
Ｃ２、３におけるＰチャンネルＦＥＴソース側共通線Ｌ
１に供給する。The scanning driver ICs 2 and 3 are provided with scanning voltage supply circuits 5 and 6 for supplying a scanning voltage. The scanning voltage supply circuit 5 includes a switching element 51,
52, according to the ON / OFF state of the scanning driver I, the DC voltage (writing voltage) Vr or the ground voltage.
P-channel FET source-side common line L at C2 and C3
Feed to 1.

【００１８】走査電圧供給回路６は、スイッチング素子
６１、６２を有し、そのオンオフ状態に応じて、直流電
圧−Ｖｒ＋Ｖｍまたはオフセット電圧（Ｖ_O1：この第１
実施形態においては変調電圧Ｖｍとしているため、以下
Ｖｍとして説明する）を、走査側ドライバＩＣ２、３に
おけるＮチャンネルＦＥＴソース側共通線Ｌ２に供給す
る。The scanning voltage supply circuit 6 has switching elements 61 and 62, and depending on the on / off state, a DC voltage -Vr + Vm or an offset voltage (V _O1 : this first voltage).
In the embodiment, since the modulation voltage is Vm, the modulation voltage is described below as Vm) is supplied to the N-channel FET source-side common line L2 in the scanning driver ICs 2 and 3.

【００１９】また、データ側ドライバＩＣ４に対し、デ
ータ電圧供給回路７が設けられており、データ側ドライ
バＩＣ４のＰチャンネルＦＥＴソース側共通線に直流電
圧（変調電圧）Ｖｍを供給し、ＮチャンネルＦＥＴソー
ス側共通線に接地電圧を供給する。上記構成において、
ＥＬ素子を発光させるには、走査電極とデータ電極との
間に交流のパルス電圧を印加する必要があり、このため
フィールド毎に正負に極性反転するパルス電圧を各走査
線毎に作成して駆動を行うようにしている。以下、図３
に示すタイミングチャートを参照して、正負フィールド
での作動について説明する。（正フィールド）スイッチング素子５１、６２をオン、
５２、６１をオフにする。この時、走査電極２０１、３
０１、２０２、３０２、…の基準電圧は、走査側ドライ
バＩＣ２、３のＦＥＴの寄生ダイオードの作動により、
オフセット電圧Ｖｍとなっている。また、データ側ドラ
イバＩＣ４のＦＥＴ４１ａ、４２ａ、４３ａ、…側をオ
ンし、データ電極の電圧をＶｍにする。この状態では、
全てのＥＬ素子に印加される電圧が０Ｖになるため、Ｅ
Ｌ素子は発光しない。A data voltage supply circuit 7 is provided for the data driver IC 4 to supply a DC voltage (modulation voltage) Vm to the P-channel FET source common line of the data driver IC 4, and to supply an N-channel FET Supply the ground voltage to the source side common line. In the above configuration,
In order to make the EL element emit light, it is necessary to apply an AC pulse voltage between the scanning electrode and the data electrode. Therefore, a pulse voltage for inverting the polarity between the fields is created for each scanning line and driven. To do. Hereinafter, FIG.
The operation in the positive and negative fields will be described with reference to the timing chart shown in FIG. (Positive field) Switching elements 51 and 62 are turned on,
Turn off 52 and 61. At this time, the scanning electrodes 201, 3
The reference voltages of 01, 202, 302,... Are set by the operation of the parasitic diodes of the FETs of the scanning driver ICs 2 and 3.
The offset voltage is Vm. Further, the FETs 41a, 42a, 43a,... Of the data side driver IC 4 are turned on, and the voltage of the data electrode is set to Vm. In this state,
Since the voltage applied to all the EL elements becomes 0 V, E
The L element does not emit light.

【００２０】この後、正フィールドでの発光動作を開始
する。まず、１行目の走査電極２０１に接続されている
走査側ドライバＩＣ２のＰチャンネルＦＥＴ２１ａをオ
ンにして、走査電極２０１の電圧をＶｒにする。また、
他の走査電極に接続されている走査側ドライバＩＣ２、
３の出力段ＦＥＴを全てオフにしそれらの走査電極をフ
ローティング状態にする。Thereafter, the light emission operation in the positive field is started. First, the P-channel FET 21a of the scanning driver IC2 connected to the scanning electrode 201 in the first row is turned on, and the voltage of the scanning electrode 201 is set to Vr. Also,
A scanning driver IC2 connected to another scanning electrode,
All the output stage FETs 3 are turned off, and their scan electrodes are brought into a floating state.

【００２１】また、データ電極４０１、４０２、４０
３、…のうち発光させたいＥＬ素子のデータ電極に接続
されているデータ側ドライバＩＣ４のＰチャンネルＦＥ
Ｔをオフ、ＮチャンネルＦＥＴをオンにし、発光させた
くないＥＬ素子のデータ電極に接続されているデータ側
ドライバＩＣ４のＰチャンネルＦＥＴをオン、Ｎチャン
ネルＦＥＴをオフにする。The data electrodes 401, 402, 40
3, P-channel FE of the data side driver IC 4 connected to the data electrode of the EL element to emit light
T is turned off, the N-channel FET is turned on, and the P-channel FET of the data-side driver IC 4 connected to the data electrode of the EL element that does not want to emit light is turned on, and the N-channel FET is turned off.

【００２２】このことにより、発光させたいＥＬ素子の
データ電極の電圧が接地電圧になるため、ＥＬ素子にし
きい値電圧以上の電圧ＶｒがかかりＥＬ素子が発光す
る。また、発光させたくないＥＬ素子のデータ電極の電
圧はＶｍのままとなり、ＥＬ素子にはＶｒ−Ｖｍの電圧
が印加される。このＶｒ−Ｖｍの電圧は、しきい値電圧
より低く設定されておりＥＬ素子は発光しない。As a result, the voltage of the data electrode of the EL element desired to emit light becomes the ground voltage, so that a voltage Vr higher than the threshold voltage is applied to the EL element, and the EL element emits light. In addition, the voltage of the data electrode of the EL element that does not want to emit light remains at Vm, and a voltage of Vr-Vm is applied to the EL element. The voltage of Vr-Vm is set lower than the threshold voltage, and the EL element does not emit light.

【００２３】図３のタイミングチャートでは、データ側
ドライバＩＣ４のＰチャンネルＦＥＴ４１ａをオフ、Ｎ
チャンネルＦＥＴ４１ｂをオンにして、ＥＬ素子１１１
にＶｒの電圧を印加し、ＥＬ素子１１１を発光させる状
態を示している。この後、１行目の走査電極２０１に接
続されている走査側ドライバＩＣ２のＰチャンネルＦＥ
Ｔ２１ａをオフにし、ＮチャンネルＦＥＴ２１ｂをオン
することにより、走査電極２０１上のＥＬ素子に蓄積し
た電荷を放電する。In the timing chart of FIG. 3, the P-channel FET 41a of the data side driver IC 4 is turned off,
When the channel FET 41b is turned on, the EL element 111
A state where a voltage of Vr is applied to the EL element 111 to emit light is shown. After that, the P-channel FE of the scanning driver IC2 connected to the scanning electrode 201 of the first row.
By turning off T21a and turning on the N-channel FET 21b, the electric charge accumulated in the EL element on the scan electrode 201 is discharged.

【００２４】次に、２行目の走査電極３０１に接続され
ている走査側ドライバＩＣ３のＰチャンネルＦＥＴ３１
ａをオンして、走査電極３０１の電圧をＶｒにする。ま
た、他の走査電極に接続されている走査側ドライバＩＣ
２、３の出力段ＦＥＴを全てオフにしそれらの走査電極
をフローティング状態にする。また、データ電極４０
１、４０２、４０３、…の電圧レベルを、発光させたい
ＥＬ素子と発光させたくないＥＬ素子に応じた電圧レベ
ルとすることにより、上記したのと同様にして２行目の
ＥＬ素子の発光駆動を行う。Next, the P-channel FET 31 of the scanning driver IC3 connected to the scanning electrode 301 in the second row.
a is turned on to set the voltage of the scanning electrode 301 to Vr. A scanning driver IC connected to another scanning electrode;
A few output stage FETs are all turned off and their scan electrodes are brought into a floating state. Also, the data electrode 40
By setting the voltage levels of 1, 402, 403,... According to the EL elements to emit light and the EL elements not to emit light, the light emission driving of the EL elements in the second row is performed in the same manner as described above. I do.

【００２５】図３のタイミングチャートでは、データ側
ドライバＩＣ４のＰチャンネルＦＥＴ４１ａをオン、Ｎ
チャンネルＦＥＴ４１ｂをオフにし、データ電極４０１
の電圧をＶｍとして、ＥＬ素子１２１にＶｒ−Ｖｍの電
圧を印加し、ＥＬ素子１２１を発光させない状態を示し
ている。この後、２行目の走査電極３０１に接続されて
いる走査側ドライバＩＣ３のＰチャンネルＦＥＴ３１ａ
をオフにし、ＮチャンネルＦＥＴ３１ｂをオンすること
により、走査電極３０１上のＥＬ素子に蓄積した電荷を
放電する。In the timing chart of FIG. 3, the P-channel FET 41a of the data side driver IC 4 is turned on,
The channel FET 41b is turned off, and the data electrode 401 is turned off.
Is a state in which a voltage of Vr-Vm is applied to the EL element 121 with the voltage of Vm as Vm, and the EL element 121 does not emit light. Thereafter, the P-channel FET 31a of the scanning driver IC3 connected to the scanning electrode 301 of the second row.
Is turned off and the N-channel FET 31b is turned on, thereby discharging the electric charge accumulated in the EL element on the scan electrode 301.

【００２６】以後、同様にして、最後の走査線に至るま
で上記作動を繰り返す、線順次走査を行う。（負フィールド）スイッチング素子５２、６１をオン、
５１、６２をオフにし、極性を反転させて正フィールド
と同様な動作を行う。この時、走査電極の基準電圧は接
地電圧となる。また、データ側ドライバＩＣ４のＦＥＴ
４１ｂ、４２ｂ、４３ｂ…側をオンし、データ電極の電
圧を接地電圧にする。この状態では、全てのＥＬ素子に
印加される電圧が０Ｖになるため、ＥＬ素子は発光しな
い。Thereafter, line-sequential scanning is performed in the same manner as described above until the last scanning line is reached. (Negative field) Switching elements 52 and 61 are turned on,
By turning off 51 and 62 and inverting the polarity, the same operation as in the positive field is performed. At this time, the reference voltage of the scan electrode becomes the ground voltage. The FET of the data side driver IC4
.. Are turned on, and the voltage of the data electrode is set to the ground voltage. In this state, the voltage applied to all the EL elements becomes 0 V, so that the EL elements do not emit light.

【００２７】以下、負フィールドも正フィールドと同様
に線順次走査を行う。表示選択を行う行の走査電極には
−Ｖｒ＋Ｖｍを印加する。データ電極側においては、正
フィールドとは逆に、発光させたいデータ電極の電圧を
Ｖｍにし、発光させたくないデータ電極に対しては接地
電圧のままにする。従って、−Ｖｒ＋Ｖｍの電圧が印加
されている走査電極に対し、データ電極に電圧Ｖｍが印
加されると、それに対するＥＬ素子に−Ｖｒの電圧が印
加されＥＬ素子が発光する。また、データ電極の電圧が
接地電圧であると、ＥＬ素子にしきい値電圧より低い−
Ｖｒ＋Ｖｍが印加されるためＥＬ素子は発光しない。Hereinafter, line scanning is performed on the negative field similarly to the positive field. -Vr + Vm is applied to the scanning electrodes of the row for which the display is selected. On the data electrode side, contrary to the positive field, the voltage of the data electrode to emit light is set to Vm, and the data electrode not to emit light is kept at the ground voltage. Therefore, when the voltage Vm is applied to the data electrode with respect to the scan electrode to which the voltage of -Vr + Vm is applied, the voltage of -Vr is applied to the corresponding EL element, and the EL element emits light. When the voltage of the data electrode is the ground voltage, the EL element has a voltage lower than the threshold voltage.
Since Vr + Vm is applied, the EL element does not emit light.

【００２８】そして、上記した正負フィールドの駆動に
より１サイクルの表示動作が終了し、これを繰り返し行
う。上記した作動から分かるように、走査側ドライバＩ
Ｃ２、３には、正負フィールド共にＶｒーＶｍの電圧が
印加される。従って、走査側ドライバＩＣ２、３の耐圧
を、オフセット電圧分だけ従来のものに比べ低くするこ
とができ、走査側ドライバＩＣ２、３の低耐圧化を図る
ことができる。One cycle of the display operation is completed by the driving of the positive and negative fields described above, and this operation is repeated. As can be seen from the above operation, the scanning side driver I
A voltage of Vr-Vm is applied to C2 and C3 in both the positive and negative fields. Therefore, the withstand voltage of the scanning driver ICs 2 and 3 can be made lower than that of the related art by the offset voltage, and the withstand voltage of the scanning driver ICs 2 and 3 can be reduced.

【００２９】また、正フィールドにおいて、オフセット
電圧Ｖｍから駆動用の電圧Ｖｒに変化させているため、
その電圧変化を従来ものに比べて小さくすることがで
き、ＥＬ素子に流れるピーク電流を低くでき、ＥＬ素子
の信頼性を向上させることができる。次に、上記した走
査電圧供給回路６、データ電圧供給回路７の具体的な構
成について説明する。（Ｖｒ−Ｖｍ）の電源を用いるこ
とによってスイッチ５１、６１を省略可能にした回路を
図４に示す。In the positive field, since the offset voltage Vm is changed to the driving voltage Vr,
The voltage change can be made smaller than that of the conventional device, the peak current flowing through the EL element can be reduced, and the reliability of the EL element can be improved. Next, specific configurations of the above-described scanning voltage supply circuit 6 and data voltage supply circuit 7 will be described. FIG. 4 shows a circuit in which the switches 51 and 61 can be omitted by using a power supply of (Vr−Vm).

【００３０】電圧供給回路５〜７において、Ｖｍの電圧
を有する第１の電源８１と、Ｖｒ−Ｖｍの電圧を有する
第２の電源８２を有し、第１の電源８１の陽極と第２の
電源８２の陰極とがＰチャンネルＦＥＴ（第１のスイッ
チング手段）８４を介して接続されている。また、第２
の電源８２の陽極はＮチャンネルＦＥＴ（第２のスイッ
チング手段）８３を介して接地されている。Each of the voltage supply circuits 5 to 7 has a first power supply 81 having a voltage of Vm and a second power supply 82 having a voltage of Vr-Vm, and has an anode of the first power supply 81 and a second power supply. The cathode of the power supply 82 is connected via a P-channel FET (first switching means) 84. Also, the second
The anode of the power supply 82 is grounded via an N-channel FET (second switching means) 83.

【００３１】ＰチャンネルＦＥＴ８４には、入力端子Ｓ
２からカップリングコンデンサ８５、入力保護用のツェ
ナーダイオード８６、抵抗８７、およびフィルタ回路８
８を介して制御信号が入力される。また、Ｎチャンネル
ＦＥＴ８３には、入力端子Ｓ１からフィルタ回路８９を
介して制御信号が入力される。正フィールド時には、入
力端子Ｓ１、Ｓ２共にローレベルの制御信号が入力さ
れ、ＮチャンネルＦＥＴ８３がオフし、ＰチャンネルＦ
ＥＴ８４がオンする。この時、第２の電源８２の陰極か
ら第１の電源８１の電圧Ｖｍが、オフセット電圧として
負電圧供給ラインＬ２に出力され、また第２の電源８２
の陽極から電圧Ｖｒ（＝Ｖｒ−Ｖｍ＋Ｖｍ）が正電圧供
給ラインＬ１に出力される。The P-channel FET 84 has an input terminal S
2, a coupling capacitor 85, a Zener diode 86 for input protection, a resistor 87, and a filter circuit 8
A control signal is input through the control signal 8. Further, a control signal is input to the N-channel FET 83 from the input terminal S1 via the filter circuit 89. At the time of the positive field, a low-level control signal is input to both the input terminals S1 and S2, the N-channel FET 83 is turned off, and the P-channel F
ET84 turns on. At this time, the voltage Vm of the first power supply 81 is output from the cathode of the second power supply 82 to the negative voltage supply line L2 as an offset voltage.
A voltage Vr (= Vr−Vm + Vm) is output to the positive voltage supply line L1 from the anode.

【００３２】また、第１の電源８１の陽極、陰極から電
圧Ｖｍ、０Ｖがそれぞれデータ側ドライバＩＣ４に供給
される。従って、上記した電圧により、正フィールドで
の駆動電圧が作成される。また、負フィールド時には、
入力端子Ｓ１、Ｓ２共にハイレベルの制御信号が入力さ
れ、ＮチャンネルＦＥＴ８３がオンし、ＰチャンネルＦ
ＥＴ８４がオフする。Further, voltages Vm and 0 V are supplied to the data side driver IC 4 from the anode and the cathode of the first power supply 81, respectively. Therefore, the driving voltage in the positive field is created by the above-described voltage. In the case of a negative field,
A high-level control signal is input to both the input terminals S1 and S2, the N-channel FET 83 turns on, and the P-channel F
ET84 turns off.

【００３３】このことにより、第２の電源８２の陰極か
ら−Ｖｒ＋Ｖｍの電圧が負電圧供給ラインＬ２に出力さ
れ、また第２の電源８２の陽極から接地電圧が正電圧供
給ラインＬ１に出力される。従って、これらの電圧によ
り負フィールドでの駆動電圧が作成される。なお、図４
に示す構成において、走査側ドライバＩＣ２、３には、
アイソレーション回路（図示せず）を介して走査側ドラ
イバＩＣ駆動用の制御信号が入力され、走査側ドライバ
ＩＣの線順次走査を行う。アイソレーション回路は、基
準電位の異なる回路間の信号伝送に際してレベルシフト
を行い、論理を正しく伝達する役割を有する。As a result, the voltage of -Vr + Vm is output from the cathode of the second power supply 82 to the negative voltage supply line L2, and the ground voltage is output to the positive voltage supply line L1 from the anode of the second power supply 82. . Therefore, these voltages create a drive voltage in the negative field. FIG.
In the configuration shown in FIG.
A control signal for driving the scanning-side driver IC is input via an isolation circuit (not shown), and the scanning-side driver IC performs line-sequential scanning. The isolation circuit performs a level shift when transmitting signals between circuits having different reference potentials, and has a role of transmitting logic correctly.

【００３４】また、データ側ドライバＩＣ４の制御信号
により表示データを出力する。（第２実施形態）上記第１実施形態では、走査側ドライ
バＩＣ２、３に対して低耐圧化を図るようにしたが、本
実施形態においては、データ側ドライバＩＣ４に対して
も低耐圧化を図るようにしている。この実施形態の全体
構成を図５に示す。Also, display data is output by a control signal of the data side driver IC 4. (Second Embodiment) In the first embodiment, the withstand voltage of the scanning driver ICs 2 and 3 is reduced. In the present embodiment, the withstand voltage of the data driver IC 4 is also reduced. I try to plan. FIG. 5 shows the overall configuration of this embodiment.

【００３５】データ電圧供給回路７は、４つの電圧Ｖ
ｍ、Ｖｍ−Ｖ_O2、Ｖ_O2、０Ｖをスイッチング素子７１〜
７４の作動に応じて選択的に出力する。すなわち、正フ
ィールドにおいては、スイッチング素子７２、７４をオ
ン、７１、７３をオフし、電圧Ｖｍ−Ｖ_O2と０Ｖをデー
タ側ドライバＩＣ４に供給する。ここで、発光タイミン
グ時において、走査電極にＶｒの電圧が印加され、デー
タ電極に０Ｖの電圧が印加されると、ＥＬ素子が発光す
る。また、データ電極にＶｍ−Ｖ_O2の電圧が印加される
と、ＥＬ素子にはＶｒ−Ｖｍ＋Ｖ_O2の電圧が印加され
る。その電圧をＥＬ素子の発光しきい値電圧より低く設
定しておくことにより、ＥＬ素子を非発光状態とするこ
とができる。The data voltage supply circuit 7 has four voltages V
m, Vm−V _O2 , V _O2 , 0V are applied to the switching elements 71 to
The signal is selectively output according to the operation of 74. That is, in the positive field, the switching elements 72 and 74 are turned on, 71 and 73 are turned off, and the voltage Vm-V _O2 and 0 V are supplied to the data side driver IC 4. Here, at the time of light emission, when a voltage of Vr is applied to the scan electrode and a voltage of 0 V is applied to the data electrode, the EL element emits light. When a voltage of Vm−V _O2 is applied to the data electrode, a voltage of Vr−Vm + V _O2 is applied to the EL element. By setting the voltage lower than the light emission threshold voltage of the EL element, the EL element can be set to a non-light emitting state.

【００３６】また、負フィールドにおいては、スイッチ
ング素子７１、７３をオン、７２、７４をオフし、電圧
ＶｍとＶ_O2をデータ側ドライバＩＣ４に供給する。この
場合、走査電極に−Ｖｒ＋Ｖｍの電圧が印加された発光
タイミング時において、データ電極の電圧がＶｍの時に
はＥＬ素子が発光する。また、データ電極の電圧がＶ_O2
の時にはＥＬ素子に−Ｖｒ＋Ｖｍ−Ｖ_O2の電圧が印加さ
れるが、この電圧は上記したようにＥＬ素子の発光しき
い値電圧より低く設定されているため、ＥＬ素子を非発
光状態とする。In the negative field, the switching elements 71 and 73 are turned on and the switching elements 72 and 74 are turned off, and the voltages Vm and V _O2 are supplied to the data driver IC 4. In this case, at the light emission timing when the voltage of -Vr + Vm is applied to the scan electrode, the EL element emits light when the voltage of the data electrode is Vm. When the voltage of the data electrode is V _O2
In the case of ( _2), a voltage of -Vr + Vm-V _O2 is applied to the EL element. However, since this voltage is set lower than the emission threshold voltage of the EL element as described above, the EL element is set to the non-emission state.

【００３７】従って、上記第１実施形態と同様に、正負
のフィールドにおいてＥＬ素子を選択的に発光させるこ
とができる。上記した構成において、データ側ドライバ
ＩＣ４には、正負のフィールドにおいてＶｍ−Ｖ_O2の電
圧が印加される。従ってデータ側ドライバＩＣ４の耐圧
を、オフセット電圧Ｖ_O2分だけ低くすることができる。Accordingly, similarly to the first embodiment, the EL element can selectively emit light in the positive and negative fields. In the above-described configuration, a voltage of Vm−V _O2 is applied to the data side driver IC 4 in the positive and negative fields. Therefore, the withstand voltage of the data side driver IC 4 can be reduced by the offset voltage V _O2 .

【００３８】なお、この第２実施形態においては、走査
側ドライバＩＣ２、３とデータ側ドライバＩＣ４の両方
に対して低耐圧化を図るようにしたが、必要に応じデー
タ側ドライバＩＣ４のみに対して低耐圧化を図るように
してもよい。また、オフセット電圧Ｖ_O2として、変調電
圧Ｖｍの１／２とすれば、発光時と非発光時にＥＬ素子
に印加される電圧の差を最適なものとすることができ
る。（その他の実施形態）上述した実施形態においては、複
数の走査電極と複数のデータ電極とを互いに直交するよ
うに形成してマトリクス表示を行うものについて説明し
たが、ＥＬ素子によりセグメント表示を行うものにも本
発明を適用することができる。In the second embodiment, the withstand voltage is reduced for both the scanning driver ICs 2 and 3 and the data driver IC 4. However, if necessary, only the data driver IC 4 is provided. The withstand voltage may be reduced. If the offset voltage V _O2 is _の of the modulation voltage Vm, the difference between the voltage applied to the EL element during light emission and the voltage applied to the EL element during non-light emission can be optimized. (Other Embodiments) In the above-described embodiment, a case where a plurality of scanning electrodes and a plurality of data electrodes are formed so as to be orthogonal to each other and a matrix display is performed has been described. The present invention can also be applied to

【００３９】この場合、図３のタイミングチャートで示
したものに対し、走査電圧のシフトを行わず、セグメン
ト毎に正負の駆動電圧パルスを印加するように制御すれ
ばよい。すなわち、正フィールドにおいては、一方の電
極にオフセット電圧Ｖｍを基準電圧として印加するとと
もに発光タイミング時にＶｒの電圧を印加し、また他方
の電極には、発光させる場合に接地電圧を印加し、非発
光の場合にはＶｍの電圧（もしくは第２実施形態のよう
にＶｍ−Ｖ_O2）を印加するようにする。また、負フィー
ルドにおいては、一方の電極に接地電圧を基準電圧とし
て印加するとともに発光タイミング時に−Ｖｒ＋Ｖｍの
電圧を印加し、また他方の電極には、発光させる場合に
Ｖｍの電圧を印加し、非発光の場合には接地電圧（もし
くは第２実施形態のようにＶ_O2の電圧）を印加するよう
にする。In this case, in contrast to the timing chart shown in FIG. 3, the scanning voltage is not shifted, and control may be performed so that positive and negative driving voltage pulses are applied for each segment. That is, in the positive field, the offset voltage Vm is applied to one electrode as a reference voltage, the voltage Vr is applied at the time of light emission, and the ground voltage is applied to the other electrode when light is emitted. so as to apply a (Vm-V _O2 as or second embodiment) Vm of voltage in the case of. In the negative field, a ground voltage is applied to one electrode as a reference voltage, a voltage of -Vr + Vm is applied at the time of light emission, and a voltage of Vm is applied to the other electrode to emit light. in the case of light emission is such that the ground voltage (or voltage V _O2 as in the second embodiment).

【００４０】この実施形態におけるブロック構成を図７
に示す。電圧供給回路１４０は、第１の駆動回路１２０
に上記したＶｒ、Ｖｍ、−Ｖｒ＋Ｖｍの電圧および接地
電圧を供給し、また第２の駆動回路１３０に上記したＶ
ｍの電圧、接地電圧等を供給する。第１の駆動回路１２
０はＥＬ素子１００の一方の電極１０２に上記した正負
のフィールドで異なる電圧を印加し、第２の駆動回路１
３０は他方の電極１０６に上記した電圧を印加する。FIG. 7 shows a block configuration of this embodiment.
Shown in The voltage supply circuit 140 includes the first drive circuit 120
And the ground voltage and the above-mentioned Vr, Vm, and -Vr + Vm.
m, a ground voltage, etc. First drive circuit 12
0 applies a different voltage to the one electrode 102 of the EL element 100 in the above-mentioned positive and negative fields,
30 applies the above-mentioned voltage to the other electrode 106.

【００４１】別の実施形態として、一方の電極を接地
し、他方の電極に正負の駆動電圧パルスを印加するよう
にしてもよい。後者の場合の構成を図８に示す。電圧供
給回路１４０は、±Ｖｒの電圧と±Ｖ₀のオフセット電
圧を駆動回路１５０に出力する。駆動回路１５０は、図
９に示すようにオフセット電圧Ｖ₀を有する交流電圧を
ＥＬ素子１００の他方の電極に印加する。この場合、駆
動回路１５０の耐圧はＶｒ−Ｖ₀により設定されるた
め、オフセット電圧Ｖ₀分耐圧を低下させることができ
る。As another embodiment, one electrode may be grounded, and a positive or negative drive voltage pulse may be applied to the other electrode. FIG. 8 shows the configuration in the latter case. Voltage supply circuit 140 outputs the voltage and offset voltage of ± V ₀ of ± Vr to the drive circuit 150. The drive circuit 150 applies an AC voltage having an offset voltage V ₀ to the other electrode of the EL element 100 as shown in FIG. In this case, since the withstand voltage of the drive circuit 150 is set by Vr−V ₀ , the withstand voltage can be reduced by the offset voltage V ₀ .

【００４２】また、本発明はＥＬ素子をバックライト
（面発光）として用いる場合にも適用することができ
る。また、上記した第１、第２実施形態では、各ドライ
バＩＣ２〜４において各電極への印加電圧の切り替えを
行うスイッチング素子に、ＦＥＴ２１ａ…、３１ａ…、
４１ａ、…を用いるものを示したが、スイッチング素子
としては、ＦＥＴ以外にも、サイリスタやバイポーラト
ランジスタ等を使用することができる。The present invention can be applied to a case where an EL element is used as a backlight (surface emission). In the above-described first and second embodiments, the switching elements that switch the voltage applied to each electrode in each of the driver ICs 2 to 4 include the FETs 21a,.
Although the devices using 41a,... Have been described, a thyristor, a bipolar transistor, or the like can be used as the switching element in addition to the FET.

[Brief description of the drawings]

【図１】本発明の第１実施形態を示すＥＬ表示装置の構
成を示す全体構成図である。FIG. 1 is an overall configuration diagram illustrating a configuration of an EL display device according to a first embodiment of the present invention.

【図２】ＥＬ素子の構成を示す模式的な断面構成図であ
る。FIG. 2 is a schematic cross-sectional configuration diagram illustrating a configuration of an EL element.

【図３】図１に示すものの駆動タイミングチャートを示
す図である。FIG. 3 is a diagram showing a drive timing chart of the one shown in FIG. 1;

【図４】電圧供給回路の具体的構成を示す構成図であ
る。FIG. 4 is a configuration diagram showing a specific configuration of a voltage supply circuit.

【図５】本発明の第２実施形態を示すＥＬ表示装置の構
成を示す全体構成図である。FIG. 5 is an overall configuration diagram illustrating a configuration of an EL display device according to a second embodiment of the present invention.

【図６】図５に示すもの要部における駆動タイミングチ
ャートを示す図である。6 is a diagram showing a drive timing chart of a main part shown in FIG. 5;

【図７】セグメント表示を行う実施形態のブロック構成
図である。FIG. 7 is a block diagram of an embodiment for performing segment display.

【図８】ＥＬ素子をバックライトに適用した実施形態の
ブロック図である。FIG. 8 is a block diagram of an embodiment in which an EL element is applied to a backlight.

【図９】図８に示す実施形態の駆動波形図である。9 is a driving waveform diagram of the embodiment shown in FIG.

[Explanation of symbols]

１…ＥＬ表示パネル、２、３…走査側ドライバＩＣ、４
…データ側ドライバＩＣ、５、６…走査電圧供給回路、
７…データ電圧供給回路。1: EL display panel, 2, 3: Scan driver IC, 4
... Data side driver IC, 5, 6 ... Scan voltage supply circuit,
7. Data voltage supply circuit.

───────────────────────────────────────────────────── フロントページの続き (72)発明者伊藤信衛愛知県刈谷市昭和町１丁目１番地日本電装株式会社内 (72)発明者服部正愛知県刈谷市昭和町１丁目１番地日本電装株式会社内 (56)参考文献特開昭61−289324（ＪＰ，Ａ) (58)調査した分野(Int.Cl.⁶，ＤＢ名) G09G 3/00 - 3/38 ──────────────────────────────────────────────────続き Continuing on the front page (72) Inventor Shinei Ito 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (72) Inventor Tadashi Hattori 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Japan Denso Stock In-company (56) References JP-A-61-289324 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G09G 3/00-3/38

Claims

(57) [Claims]

1. A plurality of scan electrodes and (201, 301 ...)
A plurality of data electrodes (401, 402 ...), the scan electrodes and the data electrodes E L element (111, 112 ...) is at a position of intersection formed EL display panel (1), positive and negative power scan electrode driving circuit out of the plurality of scanning electrodes a scanning voltage different in polarity for each field (2,3)
And a data electrode driving circuit (4) for outputting a data voltage to the plurality of data electrodes (401, 402,...), And the plurality of EL elements are selectively caused to emit light by the scanning voltage and the data voltage. An EL display device comprising: a voltage supply circuit (5 to 7) for generating the scan voltage and the data voltage; wherein the voltage supply circuit includes a positive scan voltage (Vr) in the positive field; higher than the ground level o Fuse <br/> Tsu G voltage and (V _O1) is supplied to the scanning electrode driving circuit
In addition, the scan electrode driving circuit applies the positive scan voltage to the scan electrode drive circuit.
The difference voltage of the offset voltage is applied.
Ri, the scanning electrode driving circuit, the in the positive field, has become the voltage of the scanning electrodes so as to output the positive polarity of the scanning voltage to the scanning electrodes during light emission timing while the offset voltage, Further, the voltage supply circuit includes a first power supply (81) and a first power supply (81).
Two power supplies (82), the anode of the first power supply and the second power supply.
The source cathode is connected via first switching means (84).
Connected to the data power source from the anode of the first power source.
A modulation voltage (V
m), and the first switching means is turned on.
Sometimes equal to the modulation voltage from the cathode of the second power supply
Supplying the offset voltage to the scan electrode drive circuit,
The positive scanning voltage is applied from the anode of the second power supply to the
An EL display device adapted to be supplied to a scan electrode drive circuit .

2. The voltage supply circuit, wherein an anode of the second power supply is connected to a predetermined reference voltage via a second switching means (83), and the second switching means is turned off when the first switching means is turned off. when the switching means is turned on to supply a negative polarity scan voltage in the negative field from the cathode of said second power source to said scanning electrode driving circuit, the first
The reference voltage is supplied from the anode of the power supply 2 to the scan electrode driving circuit.
And the scan electrode driving circuit supplies the negative polarity scan
The difference voltage between the test voltage and the reference voltage is applied.
EL display device according to claim 1, characterized in that is.

Wherein the predetermined reference voltage Tsu ground voltage der
Te, the negative polarity scan voltage, EL display devices according to claim 2, characterized in that it is set to the modulation voltage voltage obtained by subtracting the scan voltage of the positive polarity from (-Vr + Vm).

4. A plurality of scanning electrodes (201, 301...)
.. Having a plurality of data electrodes (401, 402...)
EL element at the position where the scanning electrode and the data electrode intersect
EL display panel on which (111, 112 ...) are formed
(1) The scan voltage is applied with different polarities for each of the positive and negative fields.
Scan electrode drive circuit (2, 3) for outputting to a number of scan electrodes
And the data electrodes (401, 402,...)
A data electrode driving circuit (4) for outputting a voltage, wherein the plurality of EL elements are driven by the scanning voltage and the data voltage.
EL display device that selectively emits light
And a voltage supply for generating the scan voltage and the data voltage.
Circuit (5-7), and the data electrode drive circuit (4) is changed as the data voltage.
Adjusting either the regulated voltage (Vm) or the ground voltage to the data electrode
And the voltage supply circuit outputs the voltage in the positive field.
The scanning voltage (Vr) of the positive polarity and the modulation voltage are
The scan electrode drive circuit supplies the scan electrode drive circuit
The voltage of the difference between the scanning voltage of the positive polarity and the modulation voltage.
In addition, in the negative field, the scanning of the positive polarity
Negative voltage whose polarity is inverted with respect to the voltage of the difference between the voltage and the modulation voltage.
The polarity scanning voltage (−Vr + Vm) and the ground voltage are
Supply to the scan electrode drive circuit,
Applying the voltage of the difference between the negative scanning voltage and the ground voltage
And the scan electrode driving circuit detects the positive field.
Setting the voltage of the scan electrode to the modulation voltage,
The scan electrode of the positive polarity is applied to the scan electrode at the emission timing.
Output voltage, and in the negative field,
The pole voltage is set to the ground voltage and the light emission timing
Sometimes, the negative scanning voltage is output to the scanning electrode.
An EL display device, comprising:

5. A plurality of scanning electrodes (201, 301...)
.. Having a plurality of data electrodes (401, 402...)
EL element at the position where the scanning electrode and the data electrode intersect
EL display panel on which (111, 112 ...) are formed
(1) The scan voltage is applied with different polarities for each of the positive and negative fields.
Scan electrode drive circuit (2, 3) for outputting to a number of scan electrodes
And the data electrodes (401, 402,...)
A data electrode driving circuit (4) for outputting a voltage, wherein the plurality of EL elements are driven by the scanning voltage and the data voltage.
EL display device that selectively emits light
And a voltage supply for generating the scan voltage and the data voltage.
Circuit (5-7), wherein the voltage supply circuit has a positive voltage in the positive field.
Polarity scanning voltage (Vr) and a first voltage higher than the ground level.
The offset voltage (V _O1 ) is supplied to the scan electrode driving circuit.
Supply the scanning voltage of the positive polarity to the scanning electrode driving circuit.
And the first offset voltage.
And the scan electrode drive circuit detects the positive field.
The voltage of the scan electrode is reduced to the first offset voltage.
At the same time as the scanning electrodes,
The scanning circuit outputs a scanning voltage having a polarity, and the voltage supply circuit outputs the scanning voltage in the negative field.
And a modulation voltage and a ground level as the data voltage.
The higher second offset voltage (V _O2 ) and the data
The data is supplied to the electrode driving circuit, and is supplied to the data electrode driving circuit.
The voltage of the difference between the modulation voltage and the second offset voltage is marked.
An EL display device, which is adapted to be added to a display.

6. The negative voltage supply circuit according to claim 6 , wherein
The positive scan voltage and the first offset.
Negative scan with polarity reversed for the difference voltage of the cut voltage
A voltage (−Vr + Vm) and a ground voltage are applied to the scan electrode drive.
Supply to the scanning circuit and the negative polarity to the scan electrode driving circuit.
To apply the difference voltage between the scanning voltage and the ground voltage.
6. The EL display according to claim 5, wherein
apparatus.

Wherein said voltage supply circuit, in the positive field, the as data voltages, said second offset voltage by a voltage lower than the modulation voltage (Vm-V _O2)
If, by supplying a ground voltage to the data electrode driving circuit,
The data electrode drive circuit applies the second
The voltage of the difference between the voltage lower by the offset voltage and the ground voltage
6. The method according to claim 5, wherein
Or the EL display device according to 6 .

8. A plurality of scanning electrodes and (201, 301 ...)
A plurality of data electrodes (401, 402 ...), the scan electrodes and the data electrodes E L element (111, 112 ...) is at a position of intersection formed EL display panel (1), positive and negative power scan electrode driving circuit out of the plurality of scanning electrodes a scanning voltage different in polarity for each field (2,3)
And a data electrode driving circuit (4) for outputting a data voltage to the plurality of data electrodes (401, 402,...), And the plurality of EL elements are selectively caused to emit light by the scanning voltage and the data voltage. An EL display device includes a voltage supply circuit (5 to 7) for generating the scan voltage and the data voltage, wherein the voltage supply circuit controls a modulation voltage (Vm) and a ground level in the negative field. high offset voltage and (V _O2) is supplied to the data electrode driving circuit, the
The modulation voltage and the offset voltage are supplied to the data electrode driving circuit.
Applying a voltage of pressure difference, in the positive field,
A voltage (V) lower than the modulation voltage by the offset voltage
m−V _O2 ) and the ground voltage to the data electrode driving circuit.
To supply the data electrode drive circuit with the modulation voltage.
The difference between the voltage lower by the offset voltage and the ground voltage
A voltage is applied, and the data electrode drive circuit sets the modulation voltage to the data electrode of the EL element to be in the light emitting state in the negative field and sets the data electrode to the non-light emitting state in the negative field. The voltage of the data electrode of the device is set to the offset voltage , and the light emission state is set in the positive field.
For the data electrode of the L element, the voltage is
And the data electrode of the EL element to be in a non-light emitting state
Is the voltage from the modulation voltage by the offset voltage.
EL characterized by having a low voltage
Display device.

9. A pair of electrodes (20) on both sides of the EL light emitting layer.
1, 301 ..., 401, 402 ..., 102, 106)
With the formed EL elements (111, 112 ..., 100)
And the first electrode (201, 301..., 102)
First drive circuit for outputting drive voltage (2, 3, 120)
And the other electrode (401, 402..., 106)
A second drive circuit (4, 130) for outputting a drive voltage is provided.
A driving voltage pulse having a positive or negative polarity between the pair of electrodes.
EL table that causes the EL element to emit light by applying
In Display device, said first, said positive and negative polarity of the driving voltage to the second driver circuit
Voltage supply circuit that generates the voltage required to generate a pulse
Paths (5-7, 140), wherein the voltage supply circuit supplies the drive voltage pulse of the positive polarity.
During the generation period, the first drive voltage (V
r) and a first offset voltage (V
_O1 , Vm) to one of the first and second drive circuits.
Then, the first drive voltage of the positive polarity is supplied to the one drive circuit.
And a voltage having a difference between the pressure and the first offset voltage.
Note that the drive voltage pulse of negative polarity is
The first drive voltage of the positive polarity and the first offset
Drive voltage of which polarity is reversed with respect to the voltage of the
Voltage (−Vr + Vm) and the ground voltage are connected to the one driving circuit.
And the one drive circuit supplies the negative drive
The difference between the voltage and the ground voltage
And the first drive voltage of the positive polarity and the negative polarity is
Between the pair of electrodes in relation to the drive voltage of the drive circuit of FIG.
The applied voltage is a threshold voltage at which the EL element emits light.
Wherein the first offset voltage is:
The pair of electrodes are driven in relation to the drive voltage of the other drive circuit.
The voltage applied between the poles becomes lower than the threshold voltage
An EL display device, comprising:

10. The voltage supply circuit according to claim 1 , wherein
In the period in which the drive voltage pulse is generated, the second drive
Voltage (Vm) and a second offset above ground level
And a voltage (V _O2 ) to the other drive circuit,
The other drive circuit supplies the second drive voltage and the second off
A voltage having a difference between the set voltages is applied, and the drive voltage having the positive polarity is applied.
During the period in which the pressure pulse is generated, the second drive
Voltage lower than the voltage (Vm−
V _O2 ) and the ground voltage are supplied to the other drive circuit.
The second drive circuit supplies the other drive circuit with the second drive voltage.
Difference between a voltage lower by a second offset voltage and the ground voltage
And the second drive voltage is a drive voltage of the one drive circuit.
The voltage applied between the pair of electrodes in relation to
The threshold voltage for causing the L element to emit light.
And the second offset voltage is equal to the one drive circuit.
The voltage applied between the pair of electrodes in relation to the drive voltage
Voltage is lower than the threshold voltage.
The EL display device according to claim 9, wherein:

11. A pair of electrodes (10) on both sides of the EL light emitting layer.
2, 106) and the EL element (100) having one of the pair of electrodes alternately having positive and negative polarities.
A drive voltage pulse is applied to drive the EL element to emit light.
A driving circuit (150) and a driving voltage pulse having the positive and negative polarities in the driving circuit.
Voltage supply circuit (140) for supplying a voltage necessary for
And the voltage supply circuit (140) includes the positive drive voltage
Drive for light emission as voltage required to generate pulse
Voltage (Vr) and offset voltage higher than ground level
(V _O ) to the drive circuit,
The voltage of the difference between the drive voltage for light emission and the offset voltage is
To generate the negative drive voltage pulse.
The necessary voltages include the driving voltage for light emission and the offset.
Drive voltage for each of the
To the driving circuit, and the driving circuit for the light emission is supplied to the driving circuit.
Voltage and the offset voltage.
The drive circuit is configured to output the positive drive voltage pulse to the one
In the period to be applied to the square of the electrode, emitting the EL element
The drive voltage for light emission is output at the timing of
Otherwise, the offset voltage is output,
Applying the negative drive voltage pulse to the one electrode;
During which the EL element emits light
Sometimes a voltage whose polarity is inverted with respect to the driving voltage for light emission
Is output, otherwise, the offset voltage is
Output a voltage with inverted polarity
An EL display device characterized by the above-mentioned.