JP3792950B2 - Organic EL display device and driving method of organic EL element - Google Patents

Organic EL display device and driving method of organic EL element Download PDF

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JP3792950B2
JP3792950B2 JP20184099A JP20184099A JP3792950B2 JP 3792950 B2 JP3792950 B2 JP 3792950B2 JP 20184099 A JP20184099 A JP 20184099A JP 20184099 A JP20184099 A JP 20184099A JP 3792950 B2 JP3792950 B2 JP 3792950B2
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organic
display
temperature
illuminance
measuring
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JP2001035655A (en
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博之 小田切
和実 佐久本
雅文 星野
進 藤田
篤也 赤瀬
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Seiko Instruments Inc
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Seiko Instruments Inc
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Description

【０００１】
【発明の属する技術分野】
本発明は有機ＥＬ素子を有する有機ＥＬ表示装置、及び有機ＥＬ素子の駆動方法に関し、有機ＥＬパネルの置かれる外部環境により表示エレメントの発光強度を変えて、常に最適な発光強度で表示するための補正回路に関するものである。
【０００２】
【従来の技術】
従来の有機ＥＬ素子駆動方法のブロック図を図５に示す。また、図６は従来の有機ＥＬ表示モジュールの外観を示す平面図である。図５の温度センサー５１から温度情報、照度センサー５２から外部の照度情報が検出回路５３へ供給され、検出回路５３ではアナログで送られてくる温度情報、照度情報をデジタルデータに変換して補正データ発生回路５４へ送られる。補正データ発生回路５４では、検出データと有機ＥＬ素子の特性から予め決められた演算処理により発光輝度を決定し補正データとして駆動回路５５へ供給される。 駆動回路５５は補正データと表示データより駆動波形を発生し有機ＥＬパネル５６へ印加する。
【０００３】
図６に示すように、従来では温度センサー６４と光センサー６５が有機ＥＬパネル６２とは別に用意され、有機ＥＬ表示モジュール６１内に設置されている。 温度センサー６４にはサーミスタ、熱電対等、照度センサーにはフォトダイオード、フォトトランジスタ等が用いられる。また、検出回路５３、補正データ発生回路５４、駆動回路５５は有機ＥＬ表示モジュール６１の背面に置かれる。
【０００４】
以上のような構成により、有機ＥＬパネル５６は温度及び外部の照度で補正された輝度で発光し、明るい場所では明るく発光して、暗い場所では眩しくない程度に発光させることができる。
【０００５】
【発明が解決しようとする課題】
表示器として発光表示パネルを用いる場合、使用する環境により同じ発光輝度でも異なって見える。 太陽光などの強い外光の中では発光輝度を上げ、暗室などの暗い部屋の中では発光輝度を下げることにより見やすく奇麗な表示をさせる事ができる。また、腕時計など携帯機器の表示器においては、電池駆動のため、小型・ローパワーが要求され、使用する環境により適度な発光輝度にすることにより余分な電力を使わずにすむ。そのため、従来の構成及び方法では、照度センサー６５、温度センサー６４を有機ＥＬパネル６２や駆動回路５５とは別に設けていた。そのため、有機ＥＬ表示モジュール６１が大きくなってしまい高価なものとなってしまい、 また、センサーが有機ＥＬパネルと別に置かれているため誤差が生じる可能性がある、という問題があった。
【０００６】
【課題を解決するための手段】
本発明の有機ＥＬ素子の駆動方法においては、上記課題を解決する手段として有機ＥＬ素子に一定の電圧を加えたときの電流値を測定することにより有機ＥＬパネルに照射されている光強度および有機ＥＬパネルの温度を測定する。ここで得られた情報を元に駆動回路において有機ＥＬパネルの発光輝度を最適に調整する。これにより、外部センサーを使わずに照度の異なる環境においても見やすく奇麗な表示をさせる事ができる。
【０００７】
【発明の実施の形態】
以下に、本発明による有機ＥＬ表示装置及び有機ＥＬ素子の駆動方法の実施の形態を説明する。
すなわち、本発明による有機ＥＬ表示装置は、情報を表示する表示要素有機ＥＬ素子と、温度または照度を測定するための測定用有機ＥＬ素子と、を備えることとした。そして、測定用有機ＥＬ素子が測定した温度または照度に基づいて有機ＥＬ表示装置の発光強度を補正することにより、周囲の環境に応じて発光輝度を調整することが可能になる。
【０００８】
ここで、測定用有機ＥＬ素子として温度を測定するための温度測定用有機ＥＬ素子と照度を測定するための照度測定用有機ＥＬ素子とを共に搭載し、前述のように有機ＥＬ表示装置の発光強度を補正すれば、周囲の環境（温度、明るさ）における最適な輝度の表示を行うことが可能になる。また、表示に用いる有機ＥＬ素子と測定用有機ＥＬ素子を同一の有機ＥＬパネル内に設けることもできる。
【０００９】
【実施例】
本発明の有機ＥＬ素子の駆動方法のブロック図を図1に示す。有機ＥＬパネル１４に設けられた温度及び照度測定用の有機ＥＬ素子に一定の電圧を加えたときの電流値を測定することにより温度情報及び照度情報を電流検出回路１３は受け取り補正データ発生回路１１に伝える。
【００１０】
補正データ発生回路１１は電流検出回路１３より得られたデータと予め設定された照度と発光輝度の関係から補正データを駆動回路１２に伝える。駆動回路１２は補正データと表示データより駆動波形を発生させ有機ＥＬパネル１４に印加することにより外部環境に合った最適な輝度で発光させる。
有機ＥＬ素子に逆バイアスで５Ｖを印加して、電流値を測定した結果を表１に示す。
【００１１】
【表１】

Figure 0003792950
【００１２】
本発明に関わる有機ＥＬパネル２１の平面図を図２に示す。有機ＥＬパネル２１には、比較的大きな８字形状の７セグメント表示要素２２が左側に４桁、比較的小さな８字形状の７セグメント表示要素が右側に２桁設けられている。この左側の４桁で時刻の時分を表示し、右側の２桁で秒の表示を行う時計表示用の発光表示パネルである。また、７セグメント表示要素２２以外に照度測定用ＥＬ素子２３が見切り内、温度測定用ＥＬ素子２４が筐体またはモジュールの外枠で遮光される位置に設けられている。
【００１３】
図３に本発明の有機ＥＬ素子駆動方法の具体例を説明する回路図を示す。表示用ＥＬ素子３０２の端子にはスイッチ３０３、３０４が取り付けられ、駆動回路３０９とＧＮＤ間に接続して表示を行う状態とＶｃｃと電流検出回路３０１に接続して照度を測定する状態に切り替えられる。 本実施例では、５Ｖ程度の高い電圧で測定できるため逆バイアスで印加しているが、発光しない程度の電圧であれば順バイアスでも構わない。
【００１４】
電流検出回路３０１ではスイッチ３０３が抵抗３０５に接続され、抵抗３０５の両端の電圧を検出することにより電流値を測定する。 具体的には抵抗３０５の両端の電圧を電圧増幅回路３０６で増幅後、Ａ／Ｄコンバータ３０７でデジタルデータに変換して検出データとして出力する。
補正データ発生回路３０８では電流検出回路３０１で検出されたデータと予めＲＯＭ等で用意された照度と有機ＥＬ素子３０２の最適な発光輝度の関係から発光輝度を決定して、その補正データを駆動回路３０９に出力する。
【００１５】
駆動回路３０９では補正データと表示データから駆動波形を作り表示用ＥＬ素子３０２を発光させる。 また発光させている間はスイッチ３０３が駆動回路３０９にスイッチ３０４がＧＮＤに接続されている。
同期信号発生回路３１０は、スイッチ３０３、３０４、Ａ／Ｄコンバータ３０７、補正データ発生回路３０８および駆動回路３０９に必要な同期信号を発生し供給している。
【００１６】
図４は本発明の有機ＥＬ素子駆動方法の別の具体例を説明するための回路図である。 有機ＥＬパネル４０２には表示用ＥＬ素子４０３の他に照度測定用ＥＬ素子４０４と温度測定用ＥＬ素子４０５が同一の工程で作成され、温度測定用ＥＬ素子４０５は筐体または外枠等で遮光される位置に作成する。
電流検出回路４０１ではスイッチ４０６が照度測定用ＥＬ素子４０４と温度測定用ＥＬ素子４０５に接続され、温度と照度を切り替えて測定できるようになっている。具体的には最初にスイッチ４０６が照度測定用ＥＬ素子４０４に接続され、抵抗４０７の両端の電圧を電圧増幅回路４０８で増幅後、Ａ／Ｄコンバータ４０９でデジタルデータに変換して温度誤差が含まれた照度データとして出力される。 次にスイッチ４０６が温度測定用ＥＬ素子４０５に接続され同様の測定をして温度データとして出力される。
【００１７】
補正データ発生回路４１０では電流検出回路４０１で検出された照度データより温度データを引いて照度データとし、最適な発光輝度を決定してその補正データを駆動回路４１０に出力する。 照度と最適発光輝度、温度と発光輝度の関係は前例と同様に予めＲＯＭ等で用意される。
駆動回路４１０では補正データと表示データから駆動波形を作り表示用ＥＬ素子４０３を発光させる。同期信号発生回路４１２はスイッチ４０６、Ａ／Ｄコンバータ４０９、補正データ発生回路４１０、駆動回路４１１に必要な同期信号を発生し供給している。
【００１８】
ここで、電流測定方法として抵抗を挿入して電圧を測定する以外の方法でもよい。また、Ａ／Ｄ、補正データ発生回路、駆動回路はデジタルで処理する以外にアナログで処理しても構わない。
【００１９】
【発明の効果】
本発明の有機ＥＬ素子駆動方法を用いる事により、外付けセンサーを用いずに外部環境に合わせた発光輝度で表示させることができ、小型、軽量で見やすい表示が可能な有機ＥＬ表示モジュールを提供できる。 このため、腕時計などの、小型・ローパワー・ローコスト・ファッション性が要求される製品に用いると製品としての完成度を高める事ができ、本発明を用いる事による効果は大きい。
【図面の簡単な説明】
【図１】本発明の有機ＥＬ素子駆動方法のブロック図
【図２】図１の有機ＥＬ素子駆動方法で駆動する有機ＥＬパネルの平面図
【図３】本発明の有機ＥＬ素子駆動方法を説明するための回路図
【図４】本発明の別の有機ＥＬ素子駆動方法を説明するための回路図
【図５】従来例を示すブロック図
【図６】従来例を示す有機ＥＬ表示モジュールの平面図
【符号の説明】
１１、３０８、４１０、５４ 補正データ発生回路
１２、３０９、４１１、５５ 駆動回路
１３、３０１、４０１ 電流検出回路
１４、２１、４０２、５６、６２ 有機ＥＬパネル
２２、３０２、４０３、６３ 表示用ＥＬ素子
２３、４０４ 照度測定用ＥＬ素子
２４、４０５ 温度測定用ＥＬ素子
３０３、３０４、４０６ スイッチ
３０５、４０７ 抵抗
３０６、４０８ 電圧増幅回路
３０７、４０９ Ａ／Ｄコンバータ
３１０、４１２ 同期信号発生回路
３１１、４１３ ＣＰＵ
５１、６４ 温度センサー
５２、６５ 照度センサー
５３ 検出回路
６１ 有機ＥＬ表示モジュール[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an organic EL display device having an organic EL element, and a method for driving the organic EL element, in which the light emission intensity of the display element is changed according to the external environment where the organic EL panel is placed, and display is always performed with the optimum light emission intensity. The present invention relates to a correction circuit.
[0002]
[Prior art]
A block diagram of a conventional organic EL element driving method is shown in FIG. FIG. 6 is a plan view showing the appearance of a conventional organic EL display module. Temperature information from the temperature sensor 51 of FIG. 5 and external illuminance information from the illuminance sensor 52 are supplied to the detection circuit 53, and the detection circuit 53 converts the temperature information and illuminance information sent in analog form into digital data and correction data. It is sent to the generation circuit 54. In the correction data generation circuit 54, the light emission luminance is determined by a predetermined calculation process from the detection data and the characteristics of the organic EL element, and is supplied to the drive circuit 55 as correction data. The drive circuit 55 generates a drive waveform from the correction data and the display data and applies it to the organic EL panel 56.
[0003]
As shown in FIG. 6, a temperature sensor 64 and an optical sensor 65 are conventionally prepared separately from the organic EL panel 62 and installed in the organic EL display module 61. The temperature sensor 64 is a thermistor, a thermocouple, or the like, and the illuminance sensor is a photodiode, a phototransistor, or the like. The detection circuit 53, the correction data generation circuit 54, and the drive circuit 55 are placed on the back surface of the organic EL display module 61.
[0004]
With the above-described configuration, the organic EL panel 56 emits light with brightness corrected by temperature and external illuminance, and can emit light brightly in a bright place and not so bright in a dark place.
[0005]
[Problems to be solved by the invention]
When a light-emitting display panel is used as a display, it looks different even at the same light emission luminance depending on the environment in which it is used. By increasing the luminance in strong external light such as sunlight and lowering the luminance in a dark room such as a dark room, it is possible to display a clear display that is easy to see. In addition, a display device of a portable device such as a wristwatch requires a small size and low power for battery operation, and it is not necessary to use extra power by setting an appropriate light emission luminance depending on the environment in which it is used. Therefore, in the conventional configuration and method, the illuminance sensor 65 and the temperature sensor 64 are provided separately from the organic EL panel 62 and the drive circuit 55. Therefore, the organic EL display module 61 becomes large and expensive, and there is a problem that an error may occur because the sensor is placed separately from the organic EL panel.
[0006]
[Means for Solving the Problems]
In the driving method of the organic EL element of the present invention, as means for solving the above-mentioned problems, the light intensity applied to the organic EL panel and the organicity are measured by measuring a current value when a constant voltage is applied to the organic EL element. Measure the temperature of the EL panel. Based on the information obtained here, the light emission luminance of the organic EL panel is optimally adjusted in the drive circuit. As a result, it is possible to provide a clear display that is easy to see even in an environment with different illuminance without using an external sensor.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an organic EL display device and an organic EL element driving method according to the present invention will be described below.
That is, the organic EL display device according to the present invention includes a display element organic EL element for displaying information and a measurement organic EL element for measuring temperature or illuminance. Then, by correcting the light emission intensity of the organic EL display device based on the temperature or illuminance measured by the measuring organic EL element, the light emission luminance can be adjusted according to the surrounding environment.
[0008]
Here, a temperature measuring organic EL element for measuring temperature and an illuminance measuring organic EL element for measuring illuminance are mounted together as the measuring organic EL element, and the light emission of the organic EL display device as described above. If the intensity is corrected, it is possible to display optimal brightness in the surrounding environment (temperature, brightness). Moreover, the organic EL element used for a display and the organic EL element for a measurement can also be provided in the same organic EL panel.
[0009]
【Example】
A block diagram of a method for driving an organic EL element of the present invention is shown in FIG. The current detection circuit 13 receives the temperature information and the illuminance information by measuring a current value when a certain voltage is applied to the organic EL element for temperature and illuminance measurement provided in the organic EL panel 14, and receives the correction data generation circuit 11. To tell.
[0010]
The correction data generation circuit 11 transmits the correction data to the drive circuit 12 based on the data obtained from the current detection circuit 13 and the relationship between preset illuminance and light emission luminance. The drive circuit 12 generates a drive waveform from the correction data and the display data and applies it to the organic EL panel 14 so as to emit light with an optimum luminance suitable for the external environment.
Table 1 shows the result of measuring the current value by applying 5 V to the organic EL element with a reverse bias.
[0011]
[Table 1]
Figure 0003792950
[0012]
A plan view of the organic EL panel 21 according to the present invention is shown in FIG. The organic EL panel 21 is provided with a relatively large 8-character 7-segment display element 22 on the left and 4 digits on the left and a relatively small 8-character 7-segment display element on the right. This is a light-emitting display panel for clock display that displays the hour and minute of the time with the four digits on the left side and the seconds with the two digits on the right side. In addition to the 7-segment display element 22, the illuminance measurement EL element 23 is provided within the parting-out, and the temperature measurement EL element 24 is provided at a position shielded from light by the outer frame of the housing or the module.
[0013]
FIG. 3 is a circuit diagram for explaining a specific example of the organic EL element driving method of the present invention. Switches 303 and 304 are attached to the terminals of the display EL element 302 to switch between a state in which display is performed by connecting between the drive circuit 309 and GND and a state in which illuminance is measured by connection to the Vcc and current detection circuit 301. . In this embodiment, since the voltage can be measured at a high voltage of about 5 V, the reverse bias is applied. However, the forward bias may be used as long as the voltage does not emit light.
[0014]
In the current detection circuit 301, the switch 303 is connected to the resistor 305, and the current value is measured by detecting the voltage across the resistor 305. Specifically, after the voltage at both ends of the resistor 305 is amplified by the voltage amplifier circuit 306, it is converted into digital data by the A / D converter 307 and output as detection data.
The correction data generation circuit 308 determines the light emission luminance from the relationship between the data detected by the current detection circuit 301, the illuminance prepared in advance in the ROM or the like, and the optimum light emission luminance of the organic EL element 302, and the correction data is supplied to the drive circuit. To 309.
[0015]
The drive circuit 309 generates a drive waveform from the correction data and the display data, and causes the display EL element 302 to emit light. While the light is emitted, the switch 303 is connected to the drive circuit 309 and the switch 304 is connected to GND.
The synchronization signal generation circuit 310 generates and supplies necessary synchronization signals to the switches 303 and 304, the A / D converter 307, the correction data generation circuit 308, and the drive circuit 309.
[0016]
FIG. 4 is a circuit diagram for explaining another specific example of the organic EL element driving method of the present invention. In addition to the display EL element 403, the illuminance measurement EL element 404 and the temperature measurement EL element 405 are formed in the same process in the organic EL panel 402, and the temperature measurement EL element 405 is shielded by a housing or an outer frame. Create in the position to be.
In the current detection circuit 401, a switch 406 is connected to the illuminance measurement EL element 404 and the temperature measurement EL element 405 so that measurement can be performed by switching between temperature and illuminance. Specifically, first, the switch 406 is connected to the EL element 404 for measuring illuminance, the voltage at both ends of the resistor 407 is amplified by the voltage amplification circuit 408, and then converted into digital data by the A / D converter 409, thereby including a temperature error. Is output as illuminance data. Next, the switch 406 is connected to the temperature measuring EL element 405 and the same measurement is performed and the temperature data is output.
[0017]
The correction data generation circuit 410 subtracts temperature data from the illuminance data detected by the current detection circuit 401 to obtain illuminance data, determines the optimum light emission luminance, and outputs the correction data to the drive circuit 410. The relationship between the illuminance and the optimum light emission luminance, and the temperature and the light emission luminance is prepared in advance in a ROM or the like as in the previous example.
The drive circuit 410 generates a drive waveform from the correction data and the display data, and causes the display EL element 403 to emit light. The synchronization signal generation circuit 412 generates and supplies necessary synchronization signals to the switch 406, the A / D converter 409, the correction data generation circuit 410, and the drive circuit 411.
[0018]
Here, as a current measuring method, a method other than measuring the voltage by inserting a resistor may be used. The A / D, the correction data generation circuit, and the drive circuit may be processed in analog in addition to being processed digitally.
[0019]
【The invention's effect】
By using the organic EL element driving method of the present invention, it is possible to provide an organic EL display module that can be displayed with light emission luminance suited to the external environment without using an external sensor, and can be displayed in a small size, light weight and easy to view. . For this reason, when it is used for a product such as a wristwatch that requires small size, low power, low cost, and fashionability, the completeness of the product can be improved, and the effect of using the present invention is great.
[Brief description of the drawings]
FIG. 1 is a block diagram of an organic EL element driving method of the present invention. FIG. 2 is a plan view of an organic EL panel driven by the organic EL element driving method of FIG. FIG. 4 is a circuit diagram for explaining another organic EL element driving method of the present invention. FIG. 5 is a block diagram showing a conventional example. FIG. 6 is a plan view of an organic EL display module showing a conventional example. Figure [Explanation of symbols]
11, 308, 410, 54 Correction data generation circuit 12, 309, 411, 55 Drive circuit 13, 301, 401 Current detection circuit 14, 21, 402, 56, 62 Organic EL panel 22, 302, 403, 63 Display EL Element 23, 404 Illuminance measurement EL element 24, 405 Temperature measurement EL element 303, 304, 406 Switch 305, 407 Resistance 306, 408 Voltage amplification circuit 307, 409 A / D converter 310, 412 Synchronization signal generation circuit 311, 413 CPU
51, 64 Temperature sensor 52, 65 Illuminance sensor 53 Detection circuit 61 Organic EL display module

Claims (9)

情報を表示する表示要素有機ＥＬ素子と、温度を測定するための温度測定用有機ＥＬ素子と、を備え、
前記温度測定用有機ＥＬ素子が、前記表示要素有機ＥＬ素子を組み込む筐体により遮光されていることを特徴とする有機ＥＬ表示装置。Comprising a display element organic EL device for displaying information, and a temperature measuring organic EL element for measuring the temperature, a,
The organic EL display device, wherein the temperature measuring organic EL element is shielded from light by a housing in which the display element organic EL element is incorporated . さらに、照度を測定するための照度測定用有機ＥＬ素子を備えることを特徴とする請求項１に記載の有機ＥＬ表示装置。The organic EL display device according to claim 1, further comprising an illuminance measurement organic EL element for measuring illuminance. 前記表示要素有機ＥＬ素子と前記温度測定用有機ＥＬ素子が同一の有機ＥＬパネルに設けられたことを特徴とする請求項１に記載の有機ＥＬ表示装置。2. The organic EL display device according to claim 1 , wherein the display element organic EL element and the temperature measuring organic EL element are provided in the same organic EL panel. 前記表示要素有機ＥＬ素子と前記照度測定用有機ＥＬ素子が同一の有機ＥＬパネルに設けられたことを特徴とする請求項２に記載の有機ＥＬ表示装置。The organic EL display device according to claim 2 , wherein the display element organic EL element and the illuminance measuring organic EL element are provided in the same organic EL panel . 前記温度用有機ＥＬ素子あるいは前記照度測定用有機ＥＬ素子の測定結果に基づいて補正データを作成する補正データ発生回路と、前記補正データと表示データに応じた駆動波形を前記表示要素有機ＥＬ素子に印加する駆動回路と、を備えることを特徴とする請求項１乃至４のいずれかに記載された有機ＥＬ表示装置。 A correction data generation circuit for creating correction data based on the measurement results of the temperature organic EL element or the illuminance measurement organic EL element, and a drive waveform corresponding to the correction data and display data in the display element organic EL element An organic EL display device according to any one of claims 1 to 4, further comprising a drive circuit for application . 表示要素有機ＥＬ素子を組み込む筐体により遮光されている温度測定用有機ＥＬ素子に電圧を加えて電流値を測定することにより前記温度測定用有機ＥＬ素子の温度を測定し、前記測定の結果に基づいて前記表示要素有機ＥＬ素子の発光強度を補正することを特徴とする有機ＥＬ素子の駆動方法。The temperature of the organic EL element for temperature measurement is measured by applying a voltage to the organic EL element for temperature measurement that is shielded from light by a housing incorporating the display element organic EL element, and measuring the temperature of the organic EL element for temperature measurement. A method of driving an organic EL element, comprising correcting light emission intensity of the display element organic EL element based on the display element. 光が照射されている状態の照度測定用有機ＥＬ素子に電圧を加えて電流値を測定することにより前記照度測定用有機ＥＬ素子に照射されている光強度を測定し、前記測定の結果に基づいて前記表示要素有機ＥＬ素子の発光強度を補正することを特徴とする請求項６記載の有機ＥＬ素子の駆動方法。Based on the result of the measurement, the light intensity applied to the illuminance measurement organic EL element is measured by applying a voltage to the illuminance measurement organic EL element being irradiated with light and measuring the current value. The organic EL element driving method according to claim 6, wherein the light emission intensity of the display element organic EL element is corrected. 前記照度測定用有機ＥＬ素子に加える前記電圧が逆バイアスであることを特徴とする請求項７に記載の有機ＥＬ素子の駆動方法。 8. The method of driving an organic EL element according to claim 7, wherein the voltage applied to the illuminance measuring organic EL element is a reverse bias . 光が照射されている状態の照度測定用有機ＥＬ素子に電圧を加えて測定した電流値と、外光が照射されていない状態の温度測定用有機ＥＬ素子に電圧を加えて測定した電流値との差を光強度として表示用有機ＥＬ素子の発光強度を補正することを特徴とする有機ＥＬ素子の駆動方法。  A current value measured by applying voltage to the organic EL element for illuminance measurement in a state where light is irradiated, and a current value measured by applying voltage to an organic EL element for temperature measurement in a state where no external light is irradiated A method for driving an organic EL element, wherein the light emission intensity of the display organic EL element is corrected using the difference between the two as light intensity.
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