JPH054077Y2 - - Google Patents
Info
- Publication number
- JPH054077Y2 JPH054077Y2 JP15546384U JP15546384U JPH054077Y2 JP H054077 Y2 JPH054077 Y2 JP H054077Y2 JP 15546384 U JP15546384 U JP 15546384U JP 15546384 U JP15546384 U JP 15546384U JP H054077 Y2 JPH054077 Y2 JP H054077Y2
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting diode
- limiting resistor
- current limiting
- light
- 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 - Lifetime
Links
- 230000004397 blinking Effects 0.000 claims 1
- 230000005856 abnormality Effects 0.000 description 4
- 239000003086 colorant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Audible And Visible Signals (AREA)
Description
【考案の詳細な説明】
［技術分野］
本考案は、異なる発光色の発光ダイオードを備
えた発光ダイオード表示回路に関するものであ
る。[Detailed Description of the Invention] [Technical Field] The present invention relates to a light emitting diode display circuit including light emitting diodes of different colors.
［従来技術］
各種装置には、正常動作時は緑色発光、異常時
は赤色発光する表示回路が付設されている。この
表示回路の表示灯として発光ダイオードが使用さ
れている。その場合の回路構成の一例を第３図に
示す。[Prior Art] Various devices are equipped with display circuits that emit green light during normal operation and red light when abnormality occurs. A light emitting diode is used as the indicator light of this display circuit. An example of the circuit configuration in that case is shown in FIG.
第３図において、１は駆動信号P1，P2を発生
する駆動回路（４ビツトマイクロコンピユータな
ど）、２は正常時に点灯する緑色発光ダイオード、
３は異常時に点灯する赤色発光ダイオード、４は
前記緑色発光ダイオード２の電流制限抵抗、５は
前記赤色発光ダイオード３の電流制限抵抗で、前
記抵抗４より大きな抵抗値を有している。 In Fig. 3, 1 is a drive circuit (such as a 4-bit microcomputer) that generates drive signals P 1 and P 2 , 2 is a green light emitting diode that lights up during normal operation,
Reference numeral 3 denotes a red light emitting diode that lights up in the event of an abnormality, 4 a current limiting resistor for the green light emitting diode 2, and 5 a current limiting resistor for the red light emitting diode 3, which has a larger resistance value than the resistor 4.
緑色発光ダイオード２は駆動回路１の出力（駆
動信号）P1が出ている間点灯し、赤色発光ダイ
オード３は出力P2が出ている間点灯する（第４
図参照）。 The green light emitting diode 2 lights up while the output (drive signal) P 1 of the drive circuit 1 is output, and the red light emitting diode 3 lights up while the output P 2 is output (the fourth
(see figure).
なお、図示例では、説明の便宜上発光ダイオー
ドを２回路としたが、実際は多くの回路を有す
る。 In the illustrated example, the light emitting diode has two circuits for convenience of explanation, but in reality, it has many circuits.
しかし、上述したような回路構成では、発光色
毎に異なる電流制限抵抗が必要となるので、(i)大
きなサイズのプリント基板を使用しなければなら
ず、コストが高くなるとともに、大形のものとな
る、(ii)部品管理、検査に手間を要する、(iii)、部品
点数が多くなり信頼性が低下したり、メンテナン
スに手間がかかる、といつた欠点がある。 However, in the circuit configuration described above, a different current limiting resistor is required for each emitted color, so (i) it is necessary to use a large printed circuit board, which increases the cost and requires a large one. (ii) It takes time and effort to manage and inspect parts, and (iii) The number of parts increases, reducing reliability and requiring time and effort for maintenance.
［考案の目的］
本考案の目的は、小形化及びコストの低減が図
れる発光ダイオード表示回路を提供することにあ
る。[Purpose of the invention] An object of the invention is to provide a light emitting diode display circuit that can be miniaturized and reduced in cost.
［考案の概要］
本考案は、異なる発光色の発光ダイオードの電
流制限抵抗を共通のものとし、一方の発光ダイオ
ードを直流点灯、他方の発光ダイオードを間欠点
灯として、共通の抵抗であつても明るさがバラン
スするようにしている。[Summary of the invention] This invention uses a common current-limiting resistor for light-emitting diodes of different colors, and sets one light-emitting diode to direct current lighting and the other light-emitting diode to flash intermittently. I try to keep it balanced.
［実施例］
第１図は本考案の一実施例を示すもので、１１
は駆動時間中一定電圧が保持される駆動信号P11
と駆動時間中、ある周期でオン、オフする、いわ
ゆるパルス状の駆動信号P12を発生する駆動回路
（４ビツトマイクロコンピユータなど）、１２は正
常時に点灯する緑色発光ダイオード、１３は異常
時に点灯する赤色発光ダイオード、１４は前記両
発光ダイオード１２，１３に共通の電流制限抵抗
であり、この抵抗１４は、従来、緑色発光ダイオ
ード用とした電流制限抵抗と同抵抗値としてい
る。なお、間欠点灯時の周期Ｔは人間の眼にちら
つきを感じさせない1/60秒以下の周期とする。[Example] Figure 1 shows an example of the present invention.
is the drive signal P 11 whose voltage is kept constant during the drive time.
and a drive circuit (such as a 4-bit microcomputer) that generates a so-called pulse-like drive signal P12 that turns on and off at certain cycles during the drive time, 12 is a green light emitting diode that lights up during normal times, and 13 lights up when there is an abnormality. The red light emitting diode 14 is a current limiting resistor common to both of the light emitting diodes 12 and 13, and this resistor 14 has the same resistance value as the conventional current limiting resistor for the green light emitting diode. Incidentally, the period T during intermittent lighting is set to a period of 1/60 seconds or less so that no flicker is perceived by the human eye.
このような回路構成とすると、正常時には第２
図に示すように駆動回路１１の出力P11の出力P11
が出て緑色発光ダイオード１２が適度の明るさで
点灯する。また、異常時には第２図に示すように
周期Ｔのパルス状の出力P12が出て赤色発光ダイ
オード１３が間欠点灯となり、赤色発光ダイオー
ドを直流点灯した場合に小さ過ぎる値の抵抗１４
であつても、緑色発光ダイオード１２とのバラン
スがとれた明るさとなる。 With this kind of circuit configuration, the second
As shown in the figure, the output P 11 of the drive circuit 11
appears, and the green light emitting diode 12 lights up with appropriate brightness. In addition, when an abnormality occurs, a pulse-like output P12 with a period T is output as shown in Fig. 2, and the red light emitting diode 13 turns on intermittently.
Even if it is, the brightness is well balanced with the green light emitting diode 12.
［効果］
以上のように本考案によれば、異なる発光色の
発光ダイオードの一方を直流点灯、他方を間欠点
灯として電流制限抵抗を共通にしたので、抵抗が
一種類となり、小さいサイズで安価のプリント基
板を使用することができ、小形化が図れる。しか
も、部品の実装違いがなくなつて検査時間が半減
したり、部品管理が容易になるなど、コストの低
減に寄与できる。また、部品数が減るため、信頼
性が向上し、メンテナンスが簡単になる。[Effects] As described above, according to the present invention, one of the light emitting diodes with different light emitting colors is used for direct current lighting and the other is used for intermittent lighting, and a common current limiting resistor is used.Therefore, there is only one type of resistor, which is small in size and inexpensive. A printed circuit board can be used, and the size can be reduced. Furthermore, the inspection time is halved by eliminating component mounting errors, and component management becomes easier, contributing to cost reduction. Additionally, the reduced number of parts improves reliability and simplifies maintenance.
第１図は本考案に係る発光ダイオード表示回路
の一実施例を示す回路図、第２図は同実施例の動
作説明のためのタイミングチヤート、第３図及び
第４図は従来例の回路図及びタイミングチヤート
である。
１１……駆動回路、１２……緑色発光ダイオー
ド、１３……赤色発光ダイオード、１４……抵
抗。
Fig. 1 is a circuit diagram showing an embodiment of a light emitting diode display circuit according to the present invention, Fig. 2 is a timing chart for explaining the operation of the embodiment, and Figs. 3 and 4 are circuit diagrams of a conventional example. and timing chart. 11...Drive circuit, 12...Green light emitting diode, 13...Red light emitting diode, 14...Resistor.
Claims (1)
ードと発光色の異なる第２の発光ダイオードと、
これら第１、第２の発光ダイオードに直列に接続
された電流制限抵抗とを備え、前記両発光ダイオ
ードに対し、その各々に駆動信号を交互に出力す
ることで、選択的に点灯させる発光ダイオード表
示回路において、前記第１の発光ダイオードは定
電圧駆動信号で直流点灯させ、前記第２の発光ダ
イオードは点滅駆動信号で間欠点灯させ、前記電
流制限抵抗は前記両発光ダイオードに共通の電流
制限抵抗としたことを特徴とする発光ダイオード
表示回路。 a first light emitting diode; a second light emitting diode that emits light in a different color from the first light emitting diode;
A light emitting diode display comprising a current limiting resistor connected in series to the first and second light emitting diodes, and selectively lighting up the light emitting diodes by alternately outputting a drive signal to each of the light emitting diodes. In the circuit, the first light emitting diode is caused to light up with direct current using a constant voltage drive signal, the second light emitting diode is caused to light up intermittently using a blinking drive signal, and the current limiting resistor is a current limiting resistor common to both of the light emitting diodes. A light emitting diode display circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15546384U JPH054077Y2 (en) | 1984-10-15 | 1984-10-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15546384U JPH054077Y2 (en) | 1984-10-15 | 1984-10-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6170290U JPS6170290U (en) | 1986-05-14 |
| JPH054077Y2 true JPH054077Y2 (en) | 1993-02-01 |
Family
ID=30713474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15546384U Expired - Lifetime JPH054077Y2 (en) | 1984-10-15 | 1984-10-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH054077Y2 (en) |
-
1984
- 1984-10-15 JP JP15546384U patent/JPH054077Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6170290U (en) | 1986-05-14 |
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