JPH11272223A - Power unit for light emissive display - Google Patents
Power unit for light emissive displayInfo
- Publication number
- JPH11272223A JPH11272223A JP10079075A JP7907598A JPH11272223A JP H11272223 A JPH11272223 A JP H11272223A JP 10079075 A JP10079075 A JP 10079075A JP 7907598 A JP7907598 A JP 7907598A JP H11272223 A JPH11272223 A JP H11272223A
- Authority
- JP
- Japan
- Prior art keywords
- constant current
- light emitting
- voltage
- light emissive
- emitting display
- 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
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、たとえば有機ＥＬ
ディスプレイなどの発光ディスプレイを駆動する電源装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a power supply device for driving a light emitting display such as a display.
【０００２】[0002]
【従来の技術】特開平２−１４８６８７号公報及び特開
平７−６５９５３号公報は、有機ＥＬディスプレイを定
電流駆動することにより輝度変化を抑止することを記載
している。すなわち、上述した有機ＥＬディスプレイの
定電流駆動によれば、経時変化、温度変化、製造ばらつ
きなどに起因するその順方向バイアス電圧Ｖｆの変動に
もかかわらず一定電流を通電することができるので、デ
ィスプレイの輝度変化を大幅に低減することができる。2. Description of the Related Art JP-A-2-148687 and JP-A-7-65553 describe that a change in luminance is suppressed by driving an organic EL display at a constant current. That is, according to the above-described constant current driving of the organic EL display, a constant current can be supplied despite the fluctuation of the forward bias voltage Vf due to a change with time, a temperature change, and a manufacturing variation. Can be greatly reduced.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
た定電流駆動式有機ＥＬディスプレイ装置では、有機Ｅ
Ｌディスプレイの順方向バイアス電圧Ｖｆが小さい場合
には、定電流駆動回路の電力損失増大によりその発熱量
が増加して定電流駆動回路が高温となるという問題があ
った。However, in the above-mentioned constant current drive type organic EL display device, the organic E
When the forward bias voltage Vf of the L display is small, there is a problem that the heat generation increases due to an increase in the power loss of the constant current drive circuit, and the constant current drive circuit becomes high in temperature.
【０００４】もちろん、この定電流駆動回路を装置の冷
却しやすい部位に設けたり、特別の冷却手段を施したり
することも考えられるが、発光ディスプレイでは、その
構成要素をなす多数のピクセルすなわち発光素子を個別
に駆動する必要があるために定電流駆動回路はできるだ
け発光ディスプレイに近接させて設ける必要がある。す
なわち、定電流駆動回路と発光ディスプレイとを接続す
る配線が長いと、配線抵抗及び寄生容量の増大により、
電力ロスの増大及びレスポンス低下のために定電流駆動
回路の出力を増加させる必要があり、また配線規模が大
きいケーブルの引き回しが必要となる。Of course, it is conceivable to provide this constant current drive circuit in a portion of the device where it is easy to cool, or to provide a special cooling means. However, in a light emitting display, a large number of pixels, ie, light emitting elements, constituting its components are used. Need to be individually driven, the constant current drive circuit needs to be provided as close to the light emitting display as possible. That is, if the wiring connecting the constant current drive circuit and the light emitting display is long, the wiring resistance and the parasitic capacitance increase,
It is necessary to increase the output of the constant current drive circuit in order to increase the power loss and decrease the response, and it is necessary to route a cable having a large wiring scale.
【０００５】しかし、このように定電流駆動回路を発光
ディスプレイに近接配置する場合、高温となった定電流
駆動回路の熱が発光ディスプレイの発光特性に影響する
という問題があった。また、発光ディスプレイに対する
定電流駆動回路の熱的影響を防止するために定電流駆動
回路を発光ディスプレイから離れた位置に設ける場合で
も、このように多数の出力端子を必要とする発光ディス
プレイ駆動制御用の定電流駆動回路とケーブルとの接続
を簡素化するためには、フレキシブル基板に定電流駆動
回路ＩＣまたはベアチップを実装して樹脂モールドした
り、更には発光ディスプレイが実装される透明基板に定
電流駆動回路を直接実装乃至集積することが行われる
が、これらの場合、定電流駆動回路チップは樹脂で囲包
されるので特に難しくなるという問題があった。However, when the constant current driving circuit is disposed close to the light emitting display as described above, there has been a problem that the heat of the constant current driving circuit, which has become high temperature, affects the light emitting characteristics of the light emitting display. In addition, even when a constant current drive circuit is provided at a position distant from the light emitting display to prevent the thermal effect of the constant current drive circuit on the light emitting display, such a light emitting display drive control requires a large number of output terminals. In order to simplify the connection between the constant current drive circuit and the cable, the constant current drive circuit IC or bare chip is mounted on a flexible substrate and molded with resin, or the constant current drive circuit is mounted on a transparent substrate on which the light emitting display is mounted. A drive circuit is directly mounted or integrated. In these cases, however, there is a problem that the constant current drive circuit chip is particularly difficult because it is surrounded by resin.
【０００６】更にまとめて言えば、発光ディスプレイ駆
動用の定電流駆動回路は多数の配線を有するケーブルを
通じて発光ディスプレイ近傍あるいはこのケーブルの引
き回しや接続に起因して放熱上不利な構造や位置取りを
余儀なくされる場合があり、このため、この定電流駆動
回路の温度低減が発光ディスプレイ実装上の大きな問題
となっていた。In summary, a constant current driving circuit for driving a light emitting display is forced to have a disadvantageous structure and position in terms of heat radiation due to the vicinity of the light emitting display or the wiring and connection of the cable through a cable having a large number of wirings. Therefore, the temperature reduction of the constant current drive circuit has been a serious problem in mounting the light emitting display.
【０００７】特に、車両室内など高温となる場合がある
使用環境で用いようとする場合には、定電流駆動回路の
温度上昇により、発光ディスプレイの性能を十分に発揮
できないという弊害が予想される。本発明は上記問題点
に鑑みなされたものであり、放熱系の改良や発光機能の
低下を回避しつつ、発光ディスプレイ駆動制御用の定電
流駆動回路の温度低減を実現した発光ディスプレイ用電
源装置を提供することをその解決すべき課題としてい
る。[0007] In particular, when the light emitting display is to be used in a use environment where the temperature may be high, such as in a vehicle cabin, it is expected that the performance of the light emitting display cannot be sufficiently exhibited due to a rise in the temperature of the constant current drive circuit. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a light emitting display power supply device that realizes a temperature reduction of a constant current drive circuit for light emitting display drive control while avoiding improvement of a heat radiation system and deterioration of a light emitting function. Providing is an issue to be solved.
【０００８】[0008]
【課題を解決するための手段】本発明の発光ディスプレ
イ用電源装置によれば、発光ディスプレイに近接配置さ
れた定電流駆動回路が発光ディスプレイを定電流駆動し
てその輝度変動を抑止する。本発明によれば特に、この
定電流駆動回路に印加する電源電圧を発光ディスプレイ
の電圧降下量に応じて調節するので、スペース上及び構
造上容易ではない発光ディスプレイ周りの放熱系の更な
る改良を図ることなく、発光ディスプレイの発光機能に
制限を加えることなく、発光ディスプレイ定電流駆動用
の定電流駆動回路の発熱低減、特に、発光ディスプレイ
の電圧降下量が小さい場合における定電流駆動回路の発
熱低減を実現することができる。According to the power supply device for a light emitting display of the present invention, a constant current driving circuit disposed in close proximity to the light emitting display drives the light emitting display at a constant current to suppress the luminance fluctuation. According to the present invention, in particular, since the power supply voltage applied to the constant current drive circuit is adjusted according to the voltage drop amount of the light emitting display, further improvement of the heat radiation system around the light emitting display which is not easy in terms of space and structure is required. Reduces the heat generation of the constant current drive circuit for the constant current drive of the light emitting display without any effort and without limiting the light emitting function of the light emitting display, especially the heat reduction of the constant current drive circuit when the voltage drop amount of the light emitting display is small. Can be realized.
【０００９】以下、更に詳しく説明する。本構成では、
定電流駆動回路が発光ディスプレイ（正確にはその発光
素子）を定電流駆動する場合、発光ディスプレイの順方
向バイアス電圧Ｖｆが小さい場合にはその電圧降下量が
小さくなり、上述した各種要因によりその順方向バイア
ス電圧Ｖｆを含むそのインピーダンスが増大すればそれ
に応じて電圧降下量は増大する。The details will be described below. In this configuration,
When the constant current drive circuit drives the light emitting display (more precisely, the light emitting element) at a constant current, when the forward bias voltage Vf of the light emitting display is small, the amount of the voltage drop becomes small. As the impedance including the directional bias voltage Vf increases, the voltage drop increases accordingly.
【００１０】そこで、本構成では、定電流駆動される発
光ディスプレイの電圧降下量が小さい場合には定電流駆
動回路に印加する電源電圧を低下し、電圧降下量が大き
い場合には定電流駆動回路に印加する電源電圧を増大さ
せ、これにより発光ディスプレイの電圧降下量が小さい
場合における定電流駆動回路の電圧降下の増大を減らし
て、その電力消費が所定レベルを超えるのを防止するこ
とができ、その結果として、放熱系の改良や発光機能の
低下を回避しつつ、発光ディスプレイ駆動制御用の定電
流駆動回路の温度低減を実現した発光ディスプレイ用電
源装置を提供することができる。In this configuration, the power supply voltage applied to the constant current driving circuit is reduced when the voltage drop of the light emitting display driven by the constant current is small, and the constant current driving circuit is reduced when the voltage drop is large. The power supply voltage applied to the light-emitting display can be increased, thereby reducing the increase in the voltage drop of the constant current drive circuit when the voltage drop amount of the light emitting display is small, and preventing the power consumption from exceeding a predetermined level. As a result, it is possible to provide a light-emitting display power supply device in which the temperature of a constant-current driving circuit for driving and controlling the light-emitting display is reduced while avoiding improvement of the heat radiation system and deterioration of the light-emitting function.
【００１１】請求項２記載の構成によれば請求項１記載
の発光ディスプレイ用電源装置において更に、発光ディ
スプレイに設けられたモニタ用発光素子に定電流を給電
してその電圧降下量を求め、求めた電圧降下量に所定の
電圧値を加算して信号電圧を形成し、この信号電圧に正
の相関を有する電源電圧を形成する。このようにすれ
ば、回路規模をいたずらに増大することなく、発光ディ
スプレイの電圧降下量の変動に良好に追従する電源電圧
（定電流駆動回路印加電圧）を作成することができる。According to a second aspect of the present invention, in the power supply device for a light emitting display according to the first aspect, a constant current is supplied to a monitor light emitting element provided in the light emitting display to obtain a voltage drop amount. A predetermined voltage value is added to the voltage drop amount to form a signal voltage, and a power supply voltage having a positive correlation with the signal voltage is formed. In this way, it is possible to create a power supply voltage (constant current drive circuit applied voltage) that satisfactorily follows the fluctuation of the voltage drop of the light emitting display without unnecessarily increasing the circuit scale.
【００１２】[0012]
【発明を実施するための態様】以下、本発明の好適な態
様を以下の実施例を参照して具体的に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the following examples.
【００１３】[0013]
【実施例１】本発明の発光ディスプレイ用電源装置の第
一実施例を図１を参照して以下に説明する。１はそれぞ
れ直流駆動される６４０×４８０個の発光素子１１を有
するドットの有機ＥＬディスプレイ（発光ディスプレ
イ）であり、フレキシブル基板（図示せず）によりそれ
をＸ−Ｙマトリックス駆動する定電流駆動回路２に接続
されている。定電流駆動回路２はこのフレキシブル基板
上にはんだボールなどを用いて直接表面実装された後、
樹脂モールドされている。Embodiment 1 A first embodiment of a power supply device for a light emitting display according to the present invention will be described below with reference to FIG. Reference numeral 1 denotes a dot organic EL display (light-emitting display) having 640 × 480 light-emitting elements 11 each of which is DC-driven, and a constant-current driving circuit 2 for driving the XY matrix by a flexible substrate (not shown). It is connected to the. After the constant current drive circuit 2 is directly surface-mounted on the flexible substrate using solder balls or the like,
Resin molded.
【００１４】定電流駆動回路２は、入力される制御信号
の値に応じて有機ＥＬディスプレイの各行配線や列配線
をそれぞれ定電流駆動する多数の行配線駆動制御用又は
列配線駆動制御用の定電流ドライバ回路からなるが、こ
の定電流駆動回路自体の構成は本発明の主旨ではなく、
かつ、周知の回路構成であるので、詳細な回路及び動作
説明は省略する。The constant current driving circuit 2 is a constant current driving circuit for controlling a large number of row wirings or column wirings for driving each row wiring or column wiring of the organic EL display at a constant current according to the value of an input control signal. It consists of a current driver circuit, but the configuration of this constant current drive circuit itself is not the gist of the present invention,
In addition, since it has a well-known circuit configuration, detailed description of the circuit and operation is omitted.
【００１５】３は、定電流駆動回路２に電源電圧Ｖｒを
印加する電源回路であって、発光ディスプレイ１の電圧
降下量（順方向バイアス電圧）Ｖｆに正の相関を有する
信号電圧Ｖｓを発生する電圧降下量検出回路４と、信号
電圧Ｖｓに正の相関を有する電源電圧Ｖｒを定電流駆動
回路２に印加する電源電圧発生回路５とからなる。電圧
降下量検出回路４は、バッテリ電圧Ｖｂが印加される定
電流源４１、モニタ用発光素子４２及び抵抗４３を直列
接続してなり、定電流源４１は所定の定電流ｉｃをモニ
タ用発光素子４２及び抵抗４３に供給している。したが
って、モニタ用発光素子４２及び抵抗４３の合成電圧降
下量ΣＶは、Ｖｆ＋ｒ・ｉｃとなる。ｒは抵抗４３の抵
抗値である。言い換えると、合成電圧降下量ΣＶはモニ
タ用発光素子４２の電圧降下量Ｖｆより常に一定値ΔＶ
＝ｒ・ｉｃだけ大きくなるように設定されている。な
お、モニタ用発光素子４２は発光ディスプレイ１に上記
６４０×４８０の発光素子１１に隣接して各発光素子１
１と等しい大きさに形成されている。Reference numeral 3 denotes a power supply circuit for applying a power supply voltage Vr to the constant current drive circuit 2, which generates a signal voltage Vs having a positive correlation with a voltage drop amount (forward bias voltage) Vf of the light emitting display 1. It comprises a voltage drop amount detection circuit 4 and a power supply voltage generation circuit 5 for applying a power supply voltage Vr having a positive correlation to the signal voltage Vs to the constant current drive circuit 2. The voltage drop amount detection circuit 4 includes a constant current source 41 to which the battery voltage Vb is applied, a monitoring light emitting element 42, and a resistor 43 connected in series. The constant current source 41 outputs a predetermined constant current ic to the monitoring light emitting element. 42 and a resistor 43. Therefore, the combined voltage drop ΔV of the monitor light emitting element 42 and the resistor 43 is Vf + r · ic. r is the resistance value of the resistor 43. In other words, the combined voltage drop ΔV is always a constant value ΔV greater than the voltage drop Vf of the monitor light emitting element 42.
= R · ic. The monitor light emitting element 42 is provided on the light emitting display 1 adjacent to the 640 × 480 light emitting element 11.
It is formed in a size equal to 1.
【００１６】電源電圧発生回路５は、オペアンプ５１と
ｐｎｐエミッタ接地トランジスタ５２とからなり、オペ
アンプ５１は上記合成電圧降下量ΣＶ＝Ｖｆ＋ΔＶと電
源電圧Ｖｒとの差電圧をｐｎｐエミッタ接地トランジス
タ５２のベース電極に印加し、ｐｎｐエミッタ接地トラ
ンジスタ５２は上記差電圧によりバッテリから定電流源
４１への給電をフィードバック制御し、これにより定電
流源４１に印加される電源電圧ＶｒはΣＶ＝Ｖｆ＋ΔＶ
に常に等しく調整される。The power supply voltage generating circuit 5 comprises an operational amplifier 51 and a common pnp emitter transistor 52. The operational amplifier 51 uses the difference voltage between the combined voltage drop ΔV = Vf + ΔV and the power supply voltage Vr as the base electrode of the pnp common emitter transistor 52. The pnp common emitter transistor 52 feedback-controls the power supply from the battery to the constant current source 41 by the difference voltage, whereby the power supply voltage Vr applied to the constant current source 41 is ΔV = Vf + ΔV
Is always adjusted to be equal.
【００１７】結局、この実施例によれば、定電流駆動回
路２の電力ロスＰはその出力電流をＩとすれば、Ｉ×Δ
Ｖ＝Ｉ×ｒ・ｉｃとなって、発光素子１１の電圧降下量
Ｖｆに正相関を有してたとえば温度変化乃至経時変化す
るモニタ用発光素子４２の電圧降下量に無関係となり、
したがって、発光ディスプレイ用電源装置１の電圧降下
量Ｖｆが小さくても定電流駆動回路２の電力ロスが増大
して、高温となることがない。After all, according to this embodiment, if the output current is I, the power loss P of the constant current drive circuit 2 is I × Δ
V = I × r · ic, which has a positive correlation with the voltage drop amount Vf of the light emitting element 11 and becomes irrelevant to the voltage drop amount of the monitoring light emitting element 42 that changes with temperature or changes over time, for example.
Therefore, even if the voltage drop amount Vf of the light emitting display power supply device 1 is small, the power loss of the constant current drive circuit 2 increases and the temperature does not become high.
【００１８】[0018]
【実施例２】本発明の発光ディスプレイ用電源装置の他
の実施例を図２を参照して説明する。この実施例の装置
は、実施例１の装置に比較して電源回路の構成だけが異
なるので、その電源回路６だけを以下に説明する。Embodiment 2 Another embodiment of the present invention will be described with reference to FIG. Since the device of this embodiment differs from the device of the first embodiment only in the configuration of the power supply circuit, only the power supply circuit 6 will be described below.
【００１９】この電源回路６は、電圧降下量検出回路７
と電源電圧発生回路８とからなる。電圧降下量検出回路
７は、ベース抵抗７０、エミッタホロワトランジスタ７
１、定電圧ダイオード７２、モニタ用発光素子４２、及
び、このモニタ用発光素子４２に定電流給電する定電流
ドライバ回路２０からなる。定電流ドライバ回路２０
は、有機ＥＬディスプレイ１の各行配線や列配線をそれ
ぞれ定電流駆動する多数の行配線駆動制御用又は列配線
駆動制御用の定電流ドライバ回路２１〜２ｘと同一形状
に定電流駆動回路２に形成されてモニタ用発光素子４２
に給電している。The power supply circuit 6 includes a voltage drop amount detection circuit 7
And a power supply voltage generating circuit 8. The voltage drop detection circuit 7 includes a base resistor 70, an emitter follower transistor 7
1, a constant voltage diode 72, a monitoring light emitting element 42, and a constant current driver circuit 20 for supplying a constant current to the monitoring light emitting element 42. Constant current driver circuit 20
Is formed in the constant current drive circuit 2 in the same shape as a large number of constant current driver circuits 21 to 2x for controlling the row wiring drive or column wiring drive for driving each row wiring and column wiring of the organic EL display 1 with a constant current. Monitor light emitting element 42
Powering.
【００２０】抵抗７１と定電圧ダイオード７２との接続
点には、モニタ用発光素子４２の電圧降下量Ｖｆと定電
圧ダイオード７２の電圧降下量ΔＶとの合成電圧降下量
ΣＶが印加され、これがダーリントン接続エミッタホロ
ワトランジスタからなる電源電圧発生回路８に印加さ
れ、その結果、この実施例の電源回路６は、合成電圧降
下量ΣＶから電源電圧発生回路８のほぼ一定である順方
向エミッタ・ベース間電圧降下量を差し引いた値に等し
い電源電圧Ｖｒを定電流駆動回路２に印加する。At the connection point between the resistor 71 and the constant voltage diode 72, a combined voltage drop ΔV of the voltage drop Vf of the monitor light emitting element 42 and the voltage drop ΔV of the constant voltage diode 72 is applied, which is Darlington. The power supply voltage is applied to a power supply voltage generating circuit 8 composed of a connected emitter follower transistor. As a result, the power supply circuit 6 of this embodiment has a substantially constant forward voltage between the forward emitter and base of the power supply voltage generating circuit 8 based on the combined voltage drop ΔV. The power supply voltage Vr equal to the value obtained by subtracting the voltage drop is applied to the constant current drive circuit 2.
【００２１】したがって、実施例２によっても実施例１
と同様の作用効果を奏することができる。Therefore, the first embodiment is also used in the second embodiment.
The same operation and effect as described above can be obtained.
【００２２】[0022]
【変形態様】上記実施例では、電源電圧Ｖｒを発光素子
１１の推定電圧降下量とみなす電圧降下量Ｖｆに一定値
ΔＶを加えた値としたが、一定値ΔＶの代わりに、電圧
降下量Ｖｆの所定倍とするなど、適宜変更してもよいこ
とはもちろんである。Modification In the above embodiment, the power supply voltage Vr is a value obtained by adding the constant value ΔV to the voltage drop amount Vf regarded as the estimated voltage drop amount of the light emitting element 11, but instead of the constant value ΔV, the voltage drop amount Vf Needless to say, it may be appropriately changed, for example, to a predetermined multiple of.
【図１】本発明の発光ディスプレイ用電源装置の一実施
例を示す回路図である。FIG. 1 is a circuit diagram showing one embodiment of a power supply device for a light emitting display of the present invention.
【図２】本発明の発光ディスプレイ用電源装置の他実施
例を示す回路図である。FIG. 2 is a circuit diagram showing another embodiment of the power supply device for a light emitting display of the present invention.
１は有機ＥＬディスプレイ（発光ディスプレイ）、２は
定電流駆動回路、４、７は電圧降下量検出回路、５、８
は電源電圧発生回路、４２はモニタ用発光素子、４１は
定電流源、４３は抵抗（電圧加算回路部）、７２は定電
圧ダイオード（電圧加算回路部）。1 is an organic EL display (light emitting display), 2 is a constant current drive circuit, 4, 7 is a voltage drop detection circuit, 5, 8
Is a power supply voltage generation circuit, 42 is a light emitting element for monitoring, 41 is a constant current source, 43 is a resistor (voltage addition circuit section), and 72 is a constant voltage diode (voltage addition circuit section).
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｇ０９Ｇ 3/30 Ｇ０９Ｇ 3/30 Ｊ ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI G09G 3/30 G09G 3/30 J
Claims (2)
電流駆動回路と、 前記発光ディスプレイの電圧降下量に正の相関を有する
信号電圧を発生する電圧降下量検出回路と、 前記信号電圧に正の相関を有する電源電圧を前記定電流
駆動回路に印加する電源電圧発生回路とを備えることを
特徴とする発光ディスプレイ用電源装置。A constant current driving circuit for driving the light emitting display with a constant current; a voltage drop detecting circuit for generating a signal voltage having a positive correlation with a voltage drop of the light emitting display; A power supply voltage generation circuit for applying a power supply voltage having a correlation to the constant current driving circuit.
置において、 前記電圧降下量検出回路は、前記発光ディスプレイに設
けられたモニタ用発光素子と、前記モニタ用発光素子に
定電流を給電する定電流源と、前記モニタ用発光素子の
電圧降下量に所定の電圧値を加算して前記信号電圧とす
る電圧加算回路部とを有することを特徴とする発光ディ
スプレイ用電源装置。2. The power supply device for a light emitting display according to claim 1, wherein said voltage drop detecting circuit includes a monitor light emitting element provided in said light emitting display, and a constant current for supplying a constant current to said monitor light emitting element. A power supply device for a light-emitting display, comprising: a current source; and a voltage addition circuit unit that adds a predetermined voltage value to a voltage drop amount of the monitor light-emitting element to generate the signal voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10079075A JPH11272223A (en) | 1998-03-26 | 1998-03-26 | Power unit for light emissive display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10079075A JPH11272223A (en) | 1998-03-26 | 1998-03-26 | Power unit for light emissive display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11272223A true JPH11272223A (en) | 1999-10-08 |
Family
ID=13679782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10079075A Pending JPH11272223A (en) | 1998-03-26 | 1998-03-26 | Power unit for light emissive display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11272223A (en) |
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