JP2789917B2 - Power supply method to display drive circuit - Google Patents
Power supply method to display drive circuitInfo
- Publication number
- JP2789917B2 JP2789917B2 JP8015292A JP8015292A JP2789917B2 JP 2789917 B2 JP2789917 B2 JP 2789917B2 JP 8015292 A JP8015292 A JP 8015292A JP 8015292 A JP8015292 A JP 8015292A JP 2789917 B2 JP2789917 B2 JP 2789917B2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- drive
- drive circuit
- display
- supply bus
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、プラズマ・ディスプレ
イ等の多数の駆動回路を有する表示装置の駆動回路用電
源の供給方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying power to a driving circuit of a display device having a large number of driving circuits such as a plasma display.
【０００２】[0002]
【従来の技術】従来のプラズマ・ディスプレイ等の表示
装置は、図５に示すように多数の駆動回路が必要なた
め、複数の駆動回路をまとめた集積回路が使用されてい
る。以下この集積化された駆動回路を駆動ＩＣと呼ぶ。
この駆動ＩＣ２，３がまた多数個使用され、１つの表示
装置が作られている。それぞれの駆動ＩＣ２，３は複数
の電源が必要であり、複数の電源供給ライン６（以下電
源バスと呼ぶ）により並列に供給されている。各駆動Ｉ
Ｃは電源バスから供給する電圧をスイッチングして表示
用信号を表示器８が必要な電源に変え、それぞれ所望の
表示情報として表示器８に表わすようになっている。な
お、１は信号発生回路である。2. Description of the Related Art A conventional display device such as a plasma display requires a large number of drive circuits as shown in FIG. 5, so that an integrated circuit integrating a plurality of drive circuits is used. Hereinafter, the integrated drive circuit is referred to as a drive IC.
A large number of the driving ICs 2 and 3 are used to make one display device. Each of the driving ICs 2 and 3 requires a plurality of power supplies, and is supplied in parallel by a plurality of power supply lines 6 (hereinafter referred to as a power supply bus). Each drive I
C switches the voltage supplied from the power supply bus to change the display signal to a power supply required by the display 8 and displays the display signal on the display 8 as desired display information. 1 is a signal generation circuit.
【０００３】[0003]
【発明が解決しようとする課題】この従来の表示装置に
おいては、駆動ＩＣが多数並列に接続されているため、
これらの駆動ＩＣに供給する電源バスが長くなる。駆動
ＩＣは比較的高電圧で高速度にスイッチングを行なって
いるため、電源バスにパルス状の電流が流れる。このパ
ルス状の電流は、電源バスの所々に配置されたバイパス
コンデンサで吸収することは不可能であり、このパルス
状の電流が電源バスを流れることにより、電源バスがア
ンテナとして作用し、妨害電磁波の発生源となるという
問題点があった。In this conventional display device, a large number of drive ICs are connected in parallel.
The power supply bus for supplying these drive ICs becomes longer. Since the drive IC performs switching at a relatively high voltage and at a high speed, a pulsed current flows through the power supply bus. This pulse-shaped current cannot be absorbed by bypass capacitors arranged in various places of the power supply bus, and when the pulse-shaped current flows through the power supply bus, the power supply bus acts as an antenna, and an electromagnetic interference wave is generated. There was a problem that it became a source of generation.
【０００４】[0004]
【課題を解決するための手段】本発明の表示用駆動回路
への電源供給方法は、表示装置に必要な駆動ＩＣのそれ
ぞれに電源を供給する電源バスを用意し、その電源バス
より各駆動ＩＣの近傍にそれぞれの駆動ＩＣに電源を供
給するインダクタとコンデンサによるＬＣフィルタ回路
を備えている。According to a method of supplying power to a display drive circuit according to the present invention, a power supply bus for supplying power to each of drive ICs required for a display device is prepared, and each drive IC is supplied from the power supply bus. Is provided with an LC filter circuit composed of an inductor and a capacitor for supplying power to each drive IC.
【０００５】[0005]
【実施例】次に本発明について図面を参照して説明す
る。図１は本発明の一実施例を示す表示装置のブロック
図である。信号発生回路１は駆動ＩＣ２，３を駆動する
のに必要な信号群を作り出し、信号線群４により各々駆
動ＩＣ２，３に送り出している。電源５は電源バス６よ
りＬＣフィルタ７を介して駆動ＩＣ２，３に電源を供給
している。駆動ＩＣ２は表示器８の列電極群９に接続さ
れ、駆動ＩＣ３は同じく表示器８の行電極群１０に接続
され、それぞれの電極群の交点を点灯させることによ
り、表示器８に所望の表示情報を得るようになってい
る。図２は図１のＬＣフィルタ７の内部回路である。イ
ンダクタ１１及びコンデンサ１２より構成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a display device showing one embodiment of the present invention. The signal generating circuit 1 generates a group of signals necessary for driving the driving ICs 2 and 3, and sends out the signals to the driving ICs 2 and 3 by the signal line group 4. The power supply 5 supplies power to the drive ICs 2 and 3 from the power supply bus 6 via the LC filter 7. The drive IC 2 is connected to the column electrode group 9 of the display 8, and the drive IC 3 is also connected to the row electrode group 10 of the display 8. Get information. FIG. 2 is an internal circuit of the LC filter 7 of FIG. It comprises an inductor 11 and a capacitor 12.
【０００６】図３は本発明の効果を示す波形図である。
この図において、波形２１は駆動ＩＣ２，３のスイッチ
ング波形図である。波形２２はその時の駆動ＩＣの電源
の電流波形例である。この電流波形がＬＣフィルタ７で
吸収されるため電源バス６には波形例２３のようになっ
て流れる。FIG. 3 is a waveform chart showing the effect of the present invention.
In this figure, a waveform 21 is a switching waveform diagram of the driving ICs 2 and 3. A waveform 22 is a current waveform example of the power supply of the driving IC at that time. Since this current waveform is absorbed by the LC filter 7, it flows through the power supply bus 6 as shown in a waveform example 23.
【０００７】図４はＬＣフィルタの効果を高めるように
インダクタ１１を２段としたタイプのＬＣフィルタ図で
ある。このタイプにはリード線の周りにフェライトをビ
ーズ状に焼結させたインダクタとコンデンサを組合せた
一般にＥＭＩフィルタと称される製品群があり、これを
利用すると容易に本発明が実現できる。FIG. 4 is an LC filter diagram of a type having two stages of inductors 11 to enhance the effect of the LC filter. This type includes a product group generally called an EMI filter in which an inductor and a capacitor in which ferrite is sintered in a bead shape around a lead wire are combined, and the present invention can be easily realized by using this product.
【０００８】[0008]
【発明の効果】以上説明したように本発明は駆動ＩＣの
電源をＬＣフィルタを介して電源バスに接続したので、
駆動ＩＣのスイッチングによるパルス状の電流を電源バ
スにそのまま流れることがなくなり、電源バスから放射
される電磁妨害波をＬＣフィルタの値を吟味することに
より１０ｄＢ以上低下させることができる。As described above, according to the present invention, the power supply of the driving IC is connected to the power supply bus via the LC filter.
The pulsed current due to the switching of the driving IC does not flow through the power supply bus as it is, and the electromagnetic interference radiated from the power supply bus can be reduced by 10 dB or more by examining the value of the LC filter.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
【図２】本発明に用いるＬＣフィルタを示す図である。FIG. 2 is a diagram showing an LC filter used in the present invention.
【図３】本発明の波形図である。FIG. 3 is a waveform diagram of the present invention.
【図４】本発明に用いるＬＣフィルタの他の例を示す図
である。FIG. 4 is a diagram showing another example of the LC filter used in the present invention.
【図５】従来の表示用駆動回路の例を示すブロック図で
ある。FIG. 5 is a block diagram illustrating an example of a conventional display drive circuit.
１ 信号発生回路 ２，３ 駆動ＩＣ ４ 信号線群 ５ 電源 ６ 電源バス ７ ＬＣフィルタ ８ 表示器 ９ 列電極 １０ 行電極 １２ インダクタ １３ コンデンサ DESCRIPTION OF SYMBOLS 1 Signal generation circuit 2, 3 Drive IC 4 Signal line group 5 Power supply 6 Power supply bus 7 LC filter 8 Display 9 Column electrode 10 Row electrode 12 Inductor 13 Capacitor
Claims (1)
ぞれ複数の電源を供給する表示装置において、各駆動回
路へ供給する電源バスを用意し、その電源バスより各駆
動回路の近傍にてインダクタとコンデンサによるＬＣフ
ィルタ回路を介して各駆動回路へ電源を供給する表示用
駆動回路への電源供給方法。1. A display device for connecting a plurality of drive circuits of the same type in parallel and supplying a plurality of power supplies to each of the plurality of drive circuits, comprising: providing a power supply bus for supplying each drive circuit; And a method for supplying power to a display drive circuit that supplies power to each drive circuit via an LC filter circuit including a capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8015292A JP2789917B2 (en) | 1992-04-02 | 1992-04-02 | Power supply method to display drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8015292A JP2789917B2 (en) | 1992-04-02 | 1992-04-02 | Power supply method to display drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06110407A JPH06110407A (en) | 1994-04-22 |
| JP2789917B2 true JP2789917B2 (en) | 1998-08-27 |
Family
ID=13710324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8015292A Expired - Fee Related JP2789917B2 (en) | 1992-04-02 | 1992-04-02 | Power supply method to display drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2789917B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4501206B2 (en) * | 1999-04-14 | 2010-07-14 | 株式会社デンソー | Display device drive circuit |
| JP4612947B2 (en) * | 2000-09-29 | 2011-01-12 | 日立プラズマディスプレイ株式会社 | Capacitive load driving circuit and plasma display device using the same |
| JP4553643B2 (en) * | 2004-06-29 | 2010-09-29 | オプトレックス株式会社 | Driving device for liquid crystal display device |
-
1992
- 1992-04-02 JP JP8015292A patent/JP2789917B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06110407A (en) | 1994-04-22 |
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