JPH0362091A - Light emitting diode display circuit - Google Patents
Light emitting diode display circuitInfo
- Publication number
- JPH0362091A JPH0362091A JP1198768A JP19876889A JPH0362091A JP H0362091 A JPH0362091 A JP H0362091A JP 1198768 A JP1198768 A JP 1198768A JP 19876889 A JP19876889 A JP 19876889A JP H0362091 A JPH0362091 A JP H0362091A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting diode
- circuit
- series
- resistor
- 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
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000002411 adverse Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Control Of El Displays (AREA)
- Led Devices (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Audible And Visible Signals (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は表示回路に関し、特に電流光変換素子である発
光ダイオードを発光素子として用いた表示回路に関する
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a display circuit, and more particularly to a display circuit using a light emitting diode, which is a current-light conversion element, as a light emitting element.
（従来の技術）
第２図は従来の発光ダイオード表示回路の回路図であり
、本図において、Ｒ１，Ｒ２，・・・Ｒ４０は抵抗器、
３１，３２．−、Ｓ４０は開閉器、Ｄｌ、Ｄ２．・・・
、Ｄ４０は発光ダイオード、ｌａ、２ａ、・・・、４０
ａは単位回路である。この従来の発光ダイオード表示回
路は、４０個の単位回路（ｌａ〜４０ａ〉を電源電圧＋
４８Ｖの直流定電圧源の正端子と接地端子間に互いに並
列に接続してなる回路で構成されており、各単位回路（
ｌａ〜４０ａ〉はそれぞれ発光ダイオード＜Ｄｉ〜Ｄ４
０）のアノードと抵抗器（Ｒ１〜Ｒ４０）の間に開閉器
（Ｓｌ−５４０）が接続しである直列回路となっていた
。このような従来の表示回路では、発光ダイオードの点
灯または消灯は、各単位回路（ｌａ〜４０ａンのそれぞ
れの開閉器（３１〜５４０）を各々開閉することで行っ
ていた。(Prior Art) FIG. 2 is a circuit diagram of a conventional light emitting diode display circuit. In this figure, R1, R2, . . . R40 are resistors,
31, 32. -, S40 are switches, Dl, D2. ...
, D40 is a light emitting diode, la, 2a,..., 40
a is a unit circuit. This conventional light emitting diode display circuit connects 40 unit circuits (la to 40a) to a power supply voltage +
It consists of a circuit connected in parallel between the positive terminal and ground terminal of a 48V DC constant voltage source, and each unit circuit (
la~40a> are light emitting diodes <Di~D4> respectively.
A switch (Sl-540) was connected between the anode of 0) and the resistors (R1 to R40) to form a series circuit. In such conventional display circuits, the light emitting diodes are turned on or off by opening and closing respective switches (31 to 540) of each unit circuit (la to 40a).
（発明が解決しようとする課題）
上述した従来の発光ダイオード表示回路では、各単位口
＠ （１ａ〜４０ａ）の各発光ダイオード（ＤＩ〜Ｄ４
０）に対してそれぞれ抵抗器（Ｒ１−Ｒ４０）を設けて
あり、電源電圧が高くなればなる程その抵抗器（Ｒ１−
Ｒ４０）で無駄に消費される電力が増える。第２図の回
路では電源電圧が＋４８Ｖであるから開閉器（３１〜５
４０）を閉じて発光ダイオード（Ｄｉ〜Ｄ４０）を点灯
したときに抵抗器（Ｒ１−Ｒ４０）でかなりの電力が無
駄に消費される。また各単位回路（ｌａ〜４０ａ）が定
電圧源にそれぞれ並列に接続しているので、発光ダイオ
ード（Ｄｉ〜Ｄ４０）の点灯数に比例してその消費電流
が増加するので表示器の回路全体の消費電力がその動作
中に大きく変動していた。このように、従来の発光ダイ
オード表示回路には解決すべき課題があった。(Problems to be Solved by the Invention) In the conventional light emitting diode display circuit described above, each light emitting diode (DI to D4) of each unit port @ (1a to 40a)
A resistor (R1-R40) is provided for each of the resistors (R1-R40) for the
R40), the amount of power wasted increases. In the circuit shown in Figure 2, the power supply voltage is +48V, so the switch (31 to 5
40) and lights up the light emitting diodes (Di to D40), a considerable amount of power is wasted in the resistors (R1 to R40). In addition, since each unit circuit (la to 40a) is connected in parallel to a constant voltage source, the current consumption increases in proportion to the number of light emitting diodes (Di to D40) lit. Power consumption fluctuated greatly during its operation. As described above, the conventional light emitting diode display circuit has problems to be solved.
（課題を解決するための手段）
上述の課題を解決するために本発明が提供する手段は、
電流を光に変換する電流光変換素子である発光ダイオー
ドを発光素子として用いる表示器であって、第１の発光
ダイオードと開閉器とを直列に接続してなる直列回路に
第２の発光ダイオードを前記第１の発光ダイオードと同
じ極性の向きに並列に接続して構成される単位回路と、
抵抗器と、直流定電圧源とを有して成り、前記抵抗器と
複数の前記単位回路とが直列に接続されて前記直流定電
圧源の出力端子間に接続されていることを特徴とする。(Means for Solving the Problems) Means provided by the present invention to solve the above problems are as follows:
A display device that uses a light-emitting diode, which is a current-light conversion element that converts current to light, as a light-emitting element, wherein a second light-emitting diode is connected to a series circuit formed by connecting a first light-emitting diode and a switch in series. a unit circuit configured by connecting the first light emitting diode in parallel in the same polarity direction;
It comprises a resistor and a DC constant voltage source, and the resistor and the plurality of unit circuits are connected in series between the output terminals of the DC constant voltage source. .
（実施例） 次に実施例を挙げて本発明の詳細な説明する。(Example) Next, the present invention will be explained in detail with reference to Examples.
第１図は本発明の一実施例を示す回路図であり、Ｒ１は
抵抗器、３１，３２．・・・、Ｓ４０は開閉器、Ｄｌａ
、Ｄｌｂ、Ｄ２ａ、Ｄ２ｂ、−−−１Ｄ４０ ａ。FIG. 1 is a circuit diagram showing an embodiment of the present invention, where R1 is a resistor, 31, 32 . ..., S40 is the switch, Dla
, Dlb, D2a, D2b, ---1D40 a.
Ｄ４０ｂは発光ダイオード、１，２．・・・、４０は単
位回路である。以下に本実施例の回＃Ｉ構成を説明する
。D40b is a light emitting diode, 1, 2 . ..., 40 is a unit circuit. The configuration of time #I of this embodiment will be explained below.
本実施例は、抵抗器Ｒ１と４０個の単位回路（１〜４０
）が直列に接続されて電源電圧＋４８Ｖの直流定電圧源
に接続されてなる回路である。This embodiment uses resistor R1 and 40 unit circuits (1 to 40
) are connected in series and connected to a DC constant voltage source with a power supply voltage of +48V.
その単位回路ｌは、発光ダイオードＤｌａのアノードに
開閉器Ｓ１の一端を接続してなる直列回路に発光ダイオ
ードＤｌｂが並列に接続されて構成されている。単位回
路１においては、発光ダイオードＤｌｂのカソードが発
光ダイオードＤｌａのカソードに接続され、発光ダイオ
ードＤｌｂのアノードが開閉器Ｓ１の他端にそれぞれ接
続されている。その他の単位回路（２〜４０）も開閉器
（８２〜５４０）と２つの発光ダイオード（Ｄ２ａ 〜
Ｄ４０ａ、Ｄ２ｂ〜Ｄ４０ｂ）とからなる並列回路であ
り、この並列回路は単位回路１と同様の並列回路である
。各単位回路（１〜４０）において、一方の発光ダイオ
ード（Ｄｌｂ〜Ｄ４０ｂ〉は常に点灯しており他方の発
光ダイオード（Ｄ１ａ〜Ｄ４０ａ）は開閉器〈８１〜５
４０）が閉じたときに点灯し、それらのうちの後者〈Ｄ
１ａ〜Ｄ４０ａ）を表示用としている。各単位回路（１
〜４０）は直列接続なのでそれら表示用の発光ダイオー
ド（Ｄｌａ〜Ｄ４０ｂ）それぞれの点灯および消灯によ
る他の表示用の発光ダイオード（Ｄｌａ〜Ｄ４０ａ＞の
点灯中の明るさへの影響はほとんどない９本実施例では
４０個の単位回路（１〜４０）が直列に接続されて発光
ダイオードが４０個直列に接続される形になっており、
この部分の電圧降下は４０Ｖ程度に達し抵抗器Ｒ１で無
駄に消費される電力は少ない。また、発光ダイオード（
Ｄｌａ〜Ｄ４０ａ）の点灯およ、び消灯による回路全体
の消費電力の変動も第２図の従来回路に比べてはるかに
少ない９本実施例の回路では第２図に示した従来の発光
ダイオードの表示回路に比べて、点灯させる発光ダイオ
ードの数を多くする程消費電流が少なくなり、一般にｎ
個点灯時には第２図の従来の発光ダイオード表示回路の
約２ ／ ｎになる。The unit circuit 1 is constructed by connecting a light emitting diode Dlb in parallel to a series circuit formed by connecting one end of a switch S1 to the anode of a light emitting diode Dla. In the unit circuit 1, the cathode of the light emitting diode Dlb is connected to the cathode of the light emitting diode Dla, and the anode of the light emitting diode Dlb is connected to the other end of the switch S1. Other unit circuits (2 to 40) also include switches (82 to 540) and two light emitting diodes (D2a to
D40a, D2b to D40b), and this parallel circuit is similar to the unit circuit 1. In each unit circuit (1 to 40), one light emitting diode (Dlb to D40b) is always lit and the other light emitting diode (D1a to D40a) is connected to a switch (81 to 5).
40) is lit when closed, and the latter of them <D
1a to D40a) are used for display. Each unit circuit (1
~40) are connected in series, so the lighting and turning off of each of the display light emitting diodes (Dla to D40b) has almost no effect on the brightness of the other display light emitting diodes (Dla to D40a) when they are turned on. In the example, 40 unit circuits (1 to 40) are connected in series, and 40 light emitting diodes are connected in series.
The voltage drop in this part reaches about 40V, and the power wasted in the resistor R1 is small. In addition, light emitting diodes (
The variation in power consumption of the entire circuit due to the lighting and extinguishing of Dla to D40a) is also much smaller than that of the conventional circuit shown in FIG. 2. Compared to display circuits, the more light-emitting diodes that are lit, the lower the current consumption, and generally n
When each light emitting diode is turned on, it becomes about 2/n of the conventional light emitting diode display circuit shown in FIG.
（発明の効果）
以上に詳しく説明したように、本発明によれば、高い電
源電圧の定電圧源を用いた発光ダイオード表示回路にお
いて、その発光ダイオードの駆動抵抗器で消費される無
駄な電力を少なくできる。また発光ダイオードの点灯お
よび消灯による回路全体の消費電流の変動がほとんどな
いのでｔ源への悪影響がなく、発光ダイオードを多く点
灯すればする程従来の発光ダイオード表示回路に比べて
消費電力が少なくなる０本発明には、以上のような効果
がある。(Effects of the Invention) As explained in detail above, according to the present invention, in a light emitting diode display circuit using a constant voltage source with a high power supply voltage, wasted power consumed by the driving resistor of the light emitting diode can be reduced. You can do less. In addition, there is almost no change in the current consumption of the entire circuit due to turning on and off the light-emitting diodes, so there is no negative effect on the t source, and the more light-emitting diodes that are turned on, the lower the power consumption compared to conventional light-emitting diode display circuits. 0 The present invention has the above-mentioned effects.
第１図は本発明の一実施例の回路図、第２図は従来の発
光ダイオード表示回路の回路図である。
１〜４０ 、１ ａ〜４０ ａ−・−単位回路、Ｒ１〜
Ｒ４０・・・抵抗器、３１〜Ｓ４０・・・開閉器、Ｄ１
〜Ｄ４０．Ｄｉ ａ 〜Ｄ４０ａ、Ｄｉ ｂ 〜Ｄ４０
ｂ−・発光ダイオード。FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional light emitting diode display circuit. 1~40, 1 a~40 a--unit circuit, R1~
R40...Resistor, 31-S40...Switch, D1
~D40. Dia~D40a, Dib~D40
b-・Light-emitting diode.
Claims (1)
ドを発光素子として用いる表示器において、第１の発光
ダイオードと開閉器とを直列に接続してなる直列回路に
第２の発光ダイオードを前記第１の発光ダイオードと同
じ極性の向きに並列に接続して構成される単位回路と、
抵抗器と、直流定電圧源とを有して成り、前記抵抗器と
複数の前記単位回路とが直列に接続されて前記直流定電
圧源の出力端子間に接続されていることを特徴とする発
光ダイオード表示回路。In a display device that uses a light emitting diode, which is a current-light conversion element that converts current to light, as a light emitting element, a second light emitting diode is connected to the first light emitting diode in a series circuit formed by connecting the first light emitting diode and a switch in series. a unit circuit configured by connecting the light emitting diodes 1 and 1 in parallel in the same polarity direction;
It comprises a resistor and a DC constant voltage source, and the resistor and the plurality of unit circuits are connected in series between the output terminals of the DC constant voltage source. Light emitting diode display circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1198768A JPH0362091A (en) | 1989-07-31 | 1989-07-31 | Light emitting diode display circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1198768A JPH0362091A (en) | 1989-07-31 | 1989-07-31 | Light emitting diode display circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0362091A true JPH0362091A (en) | 1991-03-18 |
Family
ID=16396609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1198768A Pending JPH0362091A (en) | 1989-07-31 | 1989-07-31 | Light emitting diode display circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0362091A (en) |
-
1989
- 1989-07-31 JP JP1198768A patent/JPH0362091A/en active Pending
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