JPH01102497A - Level display device - Google Patents

Level display device

Info

Publication number
JPH01102497A
JPH01102497A JP26028187A JP26028187A JPH01102497A JP H01102497 A JPH01102497 A JP H01102497A JP 26028187 A JP26028187 A JP 26028187A JP 26028187 A JP26028187 A JP 26028187A JP H01102497 A JPH01102497 A JP H01102497A
Authority
JP
Japan
Prior art keywords
drive
level
led
level meter
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP26028187A
Other languages
Japanese (ja)
Inventor
Akira Kotani
小谷　晃
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP26028187A priority Critical patent/JPH01102497A/en
Publication of JPH01102497A publication Critical patent/JPH01102497A/en
Pending legal-status Critical Current

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  • Control Of El Displays (AREA)

Abstract

PURPOSE: To obtain display operation which is more than the number of the drive terminals of a level meter drive IC by further adding a display element to the drive terminal corresponding to the lowest reference level of the level meter drive IC. CONSTITUTION: When a current flows to the drive terminal 4a of the lowest order, an LED 2a illuminates and a transistor(TR) 6 turns on, so that an LED 2m illuminates. Then when the current to the drive terminal 4a is ceased in this illumination state, the LED 2a goes out immediately, but the TR 6 is held ON with the charging voltage of an electrolytic capacitor 9 and the LED 2m still illuminates until the electrolytic capacitor 9 is discharged through a resistance 12. Consequently, the same display operation with the artificial addition of one drive terminal more to the drive IC 1 is obtained.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は音声出力表示用レベルメータのように信号のレ
ベルに応じて点灯するＬＥＤ等の表示素子を制御するレ
ベル表示装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a level display device that controls a display element such as an LED that lights up according to the level of a signal, such as a level meter for displaying audio output.

従来の技術 従来のＬＩＣＤレベルメータを第２図に示す。第２図に
おいて、１はレベルメータドライブ端子４ａ、４ｂ、・
・・・・・４　ｎ　ヲ有ｆ７；、　Ｌ　ＩＣＤレベルメ
ータドライブＩＣであり、このレベルメータドフィブ端
子４＆、４ｂ、・・・・・・４ｎにはそれぞれＬＩＣＤ
２ａ　、　２　ｂ　、　−−−−・・２　ｎが接続され
、そ（ＤＬＩＥＤ２＆。BACKGROUND OF THE INVENTION A conventional LICD level meter is shown in FIG. In FIG. 2, 1 indicates level meter drive terminals 4a, 4b, .
・・・・・・4n has f7;, LICD level meter drive IC, and this level metered five terminals 4&, 4b, ・・・・・・4n each have LICD
2a, 2b, -----...2n are connected, and (DLIED2&.

２ｂ、・・・・・・２ｎの他端はそれぞれ抵抗３を介し
て電源に接続されている。The other ends of 2b, . . . 2n are connected to a power supply via a resistor 3, respectively.

前記ＬＩＤレベ〃メータドライブエ０１は、前記ドライ
ブ端子４１Ｌ、４ｂ、・・・・・・４ｎにそれぞれ対応
して、レベルが順次大きくなる予じめ建設された基準レ
ベルを有し、入力端子５に印加された表示すべき信号の
レベルが前記基準レベル以上になるごとに、前記ドライ
ブ端子４ｍ、ａｈ・・・・・・４ｎは接地されるよう構
成されている。すなわち、レベルメータドライブＸＯ１
への入力信号の大キさに応じてレベルメータドライブ端
子が電流をひきこんで下位のＬＲＤ４ｍから上位のＬＩ
ＣＤ４ｎの頴に点灯し、また上位のＬＫＤ＋ｎから下位
のＬＫＤ４ｍの順に消灯する。The LID level meter drive 01 has reference levels built in advance whose levels increase sequentially, corresponding to the drive terminals 41L, 4b, . . . 4n, respectively, and the input terminal 5. The drive terminals 4m, ah, . That is, level meter drive XO1
The level meter drive terminal draws current from the lower LRD4m to the upper LI according to the magnitude of the input signal to the
The light is lit on the CD4n, and the light is turned off in order from the upper LKD+n to the lower LKD4m.

発明が解決しようとする問題点 上記構成ではレベルメータドライブＩＣのドライブ端子
数りかＬＥＤを表示できず、レベルメータドライブＸＯ
のドライブ端子数が少ない場合、貧弱なレベルメータに
なつていた。本発明はかかる点に鑑み、レベルメータド
ライブＩＣのドライブ端子数より点数の多いＬＩＤを駆
動するレベル表示装置を提供することを目的とする。Problems to be Solved by the Invention With the above configuration, it is not possible to display the number of drive terminals of the level meter drive IC or the LED.
If the number of drive terminals is small, it becomes a poor level meter. In view of this, an object of the present invention is to provide a level display device that drives an LID having more points than the number of drive terminals of a level meter drive IC.

問題点を解決するための手段 本発明のレベル表示装置は、レベルメータドライブＩＣ
の最下位の基準レベルに対応するドライブ端子に遅延保
持回路を介して更に表示素子を追加接続した点に特徴を
有する。Means for Solving the Problems The level display device of the present invention uses a level meter drive IC.
The present invention is characterized in that a display element is additionally connected to the drive terminal corresponding to the lowest reference level via a delay hold circuit.

作用 本発明は前記した構成により、レベルメータドライブ１
０の最下位のドライブ端子で、遅延保持回路を介してレ
ベルメータの最下位の表示素子と遅延保持回路を介すこ
となくその上位の表示素子とを点灯させ、消灯特高レベ
ルより最下位基準レベル以下まで変化したときに遅延保
持回路により最下位の表示素子のみ消灯するのを遅らせ
ることにより、使用しているレベルメータドライブＩＣ
のドライブ端子数より多いドライブ端子数を有するドラ
イブＩＣを使用したレベル表示装置と疑似的に一致した
レベル表示を行うことが出来る。Operation The present invention has the above-described configuration, and the level meter drive 1
0's lowest drive terminal, lights up the lowest display element of the level meter through the delay hold circuit and the display element above it without going through the delay hold circuit, and turns off the extra high level to the lowest standard. By delaying the turning off of only the lowest display element using a delay hold circuit when the level changes below the level, the level meter drive IC used
It is possible to perform a level display that is pseudo-identical to that of a level display device using a drive IC having more drive terminals than the number of drive terminals of the present invention.

実施例 以下本発明の一実施例のレベル表示装置について、第１
図を参照しながら説明する。第１図において、第２図の
従来構成と同一な構成部品には同一符号を付しである。Example Below A first example of a level display device according to an example of the present invention is shown below.
This will be explained with reference to the figures. In FIG. 1, components that are the same as those in the conventional configuration shown in FIG. 2 are given the same reference numerals.

第２図の構成と異なる点は、十Ｂ電源と、アース間にト
ランジスタ６と抵抗７とＬ　ＩＥ　Ｄ　２　Ｊｌの直列
回路が挿入され、前記トランジスタ６０ベースは抵抗１
１を介して十Ｂ電源と、抵抗１ｏを介して最下位のドラ
イブ端子４ａにそれぞれ接続され、また、前記ドライブ
端子４１Ｌは抵抗１２と電解コンデンサ９の直列回路を
介して十Ｂ電源に接続されている。The difference from the configuration in FIG. 2 is that a series circuit of a transistor 6, a resistor 7, and a LIE D 2 Jl is inserted between the 1B power supply and the ground, and the base of the transistor 60 is connected to a resistor 1.
1 to the 10B power source and to the lowest drive terminal 4a through the resistor 1o, and the drive terminal 41L is connected to the 10B power source through a series circuit of a resistor 12 and an electrolytic capacitor 9. ing.

次にこの回路の動作を説明する。最下位のドライブ端子
４ａ−が電流を引き込むとＬＩＤ２ａが点灯するととも
にミドランジスタロが導通状態になりＬＩＣＤ２１ｍが
点灯する。次にこの点灯状態から最下位のドライブ端子
４＆が電流を引き込むのを止めたときは、ＬＥＤ２．１
はすぐに消灯するが、トランジスタ６は電解コンデンサ
９の充電電圧により導通状態が保たれ電解コンデンサ９
が抵抗１２を介して放電するまでの間ＬＫＩ）８ｍは点
灯状態となる。すなわち、前記トランジスタ６、抵抗１
０，１１．１２および電解コンデンサ９により構成され
る遅延保持手段の保持時間だけ遅れてＬＸＤ８ｍは消灯
されるため、疑似的にドライブＩＣ１のドライブ端子を
更に１端子増加した場合と同様な表示動作が行なわれる
。Next, the operation of this circuit will be explained. When the lowest drive terminal 4a- draws current, the LID 2a lights up, the mid range distal is brought into conduction, and the LICD 21m lights up. Next, when the lowest drive terminal 4& stops drawing current from this lighting state, LED2.1
The light goes out immediately, but the transistor 6 remains conductive due to the charging voltage of the electrolytic capacitor 9.
LKI)8m remains lit until it is discharged through the resistor 12. That is, the transistor 6, the resistor 1
Since LXD8m is turned off after a delay of the holding time of the delay holding means composed of 0, 11.12 and electrolytic capacitor 9, the display operation is similar to the case where the number of drive terminals of drive IC 1 is increased by one more terminal. It is done.

発明の効果 以上の様に、本発明によれば使用される１、ＩＣＤドラ
イブＩＣのドライブ端子数よりも多いドライブ端子数を
有するＩＣと類似した表示動作が望めるものであり、そ
の効果は大なるものである。Effects of the Invention As described above, according to the present invention, a display operation similar to that of an IC having more drive terminals than the number of drive terminals of the ICD drive IC used can be expected, and the effect is great. It is something.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例におけるレベル表示装置の電
気的結線図、第２図は従来例におけるレベル表示装置の
電気的結線図である。 １・・・・・・レベルメータドライブＸ０，２＆、２ｂ
。 ・・・・・・２ｎ、２ｍ・・・・・・表示端子（Ｉａｌ
ＣＤ）、３，７゜９．１０，１１，１２・・・・・・抵
抗、９・・・・・・電解コンデンサ、６・・・・・・ス
イッチングトランジスタ、４ａ、ａｂ、・・・・・・４
ｎ・・・・・・ドライブ端子。FIG. 1 is an electrical wiring diagram of a level display device according to an embodiment of the present invention, and FIG. 2 is an electrical wiring diagram of a level display device in a conventional example. 1...Level meter drive X0, 2 &, 2b
. ...2n, 2m...Display terminal (Ial
CD), 3,7゜9.10,11,12... Resistor, 9... Electrolytic capacitor, 6... Switching transistor, 4a, ab,...・・４
n...Drive terminal.

Claims (1)

【特許請求の範囲】[Claims] 複数のドライブ端子にそれぞれ対応して予じめ定められ
た複数の基準レベルを有し、表示すべき信号レベルが前
記の各基準レベル以上であるときに前記ドライブ端子に
点灯出力を発生するレベル検出手段と、前記ドライブ端
子にそれぞれ接続され、その点灯出力信号により点灯さ
れる表示素子と、前記基準レベルが最下位のドライブ端
子に遅延保持回路を介してさらに接続された表示素子と
よりなるレベル表示装置。A level detection device that has a plurality of predetermined reference levels corresponding to a plurality of drive terminals, and generates a lighting output to the drive terminal when a signal level to be displayed is equal to or higher than each of the reference levels. a display element connected to each of the drive terminals and lit by the lighting output signal thereof; and a display element further connected to the drive terminal having the lowest reference level via a delay holding circuit. Device.
JP26028187A 1987-10-15 1987-10-15 Level display device Pending JPH01102497A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26028187A JPH01102497A (en) 1987-10-15 1987-10-15 Level display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26028187A JPH01102497A (en) 1987-10-15 1987-10-15 Level display device

Publications (1)

Publication Number Publication Date
JPH01102497A true JPH01102497A (en) 1989-04-20

Family

ID=17345869

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26028187A Pending JPH01102497A (en) 1987-10-15 1987-10-15 Level display device

Country Status (1)

Country Link
JP (1) JPH01102497A (en)

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