JPS5845587U - Light emitting diode drive circuit - Google Patents
Light emitting diode drive circuitInfo
- Publication number
- JPS5845587U JPS5845587U JP13983981U JP13983981U JPS5845587U JP S5845587 U JPS5845587 U JP S5845587U JP 13983981 U JP13983981 U JP 13983981U JP 13983981 U JP13983981 U JP 13983981U JP S5845587 U JPS5845587 U JP S5845587U
- Authority
- JP
- Japan
- Prior art keywords
- digit
- light emitting
- emitting diode
- drive circuit
- led
- 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
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の発光ダイオード駆動回路の回路図及び説
明図で第１図ａは７セグメント発光ダイオードのダイナ
ミック駆動回路図、第１図すは第１図ａに示す回路の７
セグメント２桁表示のパターン説明図、第２図は第１図
に示す回路の表示動作のタイミングチャート、第３図は
本考案の実施例を示す７セグメント発光ダイオード駆動
回路図、第４図は第３図に示す回路の電源電圧が十分高
い場合の表示動作のタイミングチャート、第５図は第３
図に示す回路の電源電圧が低い場合の表示動作のタイミ
ングチャートである。
１・・・７セグメントデコーダドライバ、３ａ〜３ｇ・
・・７セグメント発光ダイオード（第１桁用）、４ａ〜
４゛ｇ・・・７セグメント発光ダイオード（第２桁用）
、５・・・桁ドライブ用トランジスタ、７・・・電源端
子、８・・・ダイオード（定電圧素子）、９・・・電流
帰還用抵抗、５２・・・桁ドライブ用パルス入力端子。Fig. 1 is a circuit diagram and explanatory diagram of a conventional light emitting diode drive circuit, and Fig. 1a is a dynamic drive circuit diagram of a 7-segment light emitting diode.
2 is a timing chart of the display operation of the circuit shown in FIG. 1. FIG. 3 is a 7-segment light emitting diode drive circuit diagram showing an embodiment of the present invention. The timing chart of the display operation when the power supply voltage of the circuit shown in Figure 3 is sufficiently high, and Figure 5 is the timing chart of the display operation when the power supply voltage of the circuit shown in Figure 3 is high enough.
5 is a timing chart of a display operation when the power supply voltage of the circuit shown in the figure is low. 1...7 segment decoder driver, 3a to 3g.
・・7 segment light emitting diode (for 1st digit), 4a~
4゛g...7 segment light emitting diode (for 2nd digit)
, 5... Transistor for digit drive, 7... Power supply terminal, 8... Diode (constant voltage element), 9... Resistor for current feedback, 52... Pulse input terminal for digit drive.
Claims (1)
を時分割で駆動するダイナミック駆動方式において、第
１桁のＬＥＤのコモンアノードに、桁ドライブ用パルス
によりスイッチング動作を行う桁ドライブ用トランジス
タを接続し、第２桁のＬＥＤのコモンアノードにダイオ
ード等の定電圧素子を直列接続し、上記桁ドライブ用ト
ランジスタ及び定電圧素子を電流帰還用抵抗を介して電
源端子に接続するように構成したことを特徴とする発光
ダイオード駆動回路。In a dynamic drive method that drives each digit of a 7-segment, 2-digit light emitting diode (hereinafter referred to as LED) in a time division manner, a digit drive transistor that performs switching operation using digit drive pulses is connected to the common anode of the first digit LED. , a constant voltage element such as a diode is connected in series to the common anode of the second digit LED, and the digit drive transistor and constant voltage element are connected to the power supply terminal via a current feedback resistor. Light emitting diode drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13983981U JPS5845587U (en) | 1981-09-22 | 1981-09-22 | Light emitting diode drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13983981U JPS5845587U (en) | 1981-09-22 | 1981-09-22 | Light emitting diode drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5845587U true JPS5845587U (en) | 1983-03-26 |
Family
ID=29933019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13983981U Pending JPS5845587U (en) | 1981-09-22 | 1981-09-22 | Light emitting diode drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5845587U (en) |
-
1981
- 1981-09-22 JP JP13983981U patent/JPS5845587U/en active Pending
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