JPH08137429A - Display device - Google Patents
Display deviceInfo
- Publication number
- JPH08137429A JPH08137429A JP30547394A JP30547394A JPH08137429A JP H08137429 A JPH08137429 A JP H08137429A JP 30547394 A JP30547394 A JP 30547394A JP 30547394 A JP30547394 A JP 30547394A JP H08137429 A JPH08137429 A JP H08137429A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- voltage
- series
- resistor
- display device
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は表示用ランプとして光を
発光する表示装置に関し、特に交流電圧により発光ダイ
オード（ＬＥＤ；Light Emitting Diode）を駆動させて
発光表示する表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device that emits light as a display lamp, and more particularly to a display device that emits light by driving a light emitting diode (LED) by an AC voltage.
【０００２】[0002]
【従来の技術】従来、この種の表示装置として図４に示
すものがあった。この図４は従来の表示装置の概略回路
構成図を示す。同図において従来の表示装置は、交流電
源５から交流電圧１００Ｖが一次側巻線に印加され、こ
の交流電圧１００Ｖを４Ｖに変圧する変圧器２００と、
この変圧器２００の二次側巻線に各々並列に接続され、
前記変圧された交流電圧の４Ｖが順バイアス時に発光す
る発光ダイオード１０１、１０２、１０３と、この発光
ダイオード１０１、１０２、１０３と変圧器２００との
間に各々接続され、制御信号に基づいてスイッチング動
作を行なう制御スイッチ３１、３２、３３とを備える構
成である。また、前記交流電源５が制御盤（図示を省
略）と共に遠方側に設置され、この交流電源５から電源
線６２により機器側に配設される変圧器２００及び発光
ダイオード１０１、１０２、１０３へ交流電圧が印加さ
れる。2. Description of the Related Art Conventionally, there is a display device of this type shown in FIG. FIG. 4 is a schematic circuit configuration diagram of a conventional display device. In the drawing, in the conventional display device, an AC voltage 100V is applied to the primary winding from an AC power source 5, and a transformer 200 that transforms the AC voltage 100V to 4V,
Connected in parallel to the secondary winding of the transformer 200,
The transformed AC voltage of 4V is connected to the light emitting diodes 101, 102 and 103 which emit light when forward biased, and the light emitting diodes 101, 102 and 103 and the transformer 200, and performs switching operation based on a control signal. The control switches 31, 32 and 33 for performing the above are provided. In addition, the AC power supply 5 is installed on a remote side together with a control panel (not shown), and the AC power supply 5 connects the transformer 200 and the light emitting diodes 101, 102, 103 to the transformer 200 and the light emitting diodes 101, 102, 103 by the power supply line 62. A voltage is applied.
【０００３】次に、前記構成に基づく従来の表示装置の
表示動作について説明する。まず、交流電源５から交流
電圧１００Ｖを変圧器２００の一次巻線に印加し、この
変圧器２００が交流電圧４Ｖに変圧して二次側巻線へ出
力する。この変圧された交流電圧の４Ｖが制御信号によ
り制御されて投入状態にある選択スイッチ３１（又は３
２、３３）を介して発光ダイオード１０１（又は１０
２、１０３）に印加される。この発光ダイオード１０１
（又は１０２、１０３）は交流電圧４Ｖが順バイアスと
なるときにのみ発光して表示動作を実行する。Next, the display operation of the conventional display device based on the above configuration will be described. First, an AC voltage of 100 V is applied from the AC power supply 5 to the primary winding of the transformer 200, and the transformer 200 transforms the AC voltage of 4 V into the secondary winding. 4 V of the transformed AC voltage is controlled by the control signal and the selection switch 31 (or 3) which is in a closed state.
2, 33) via the light emitting diode 101 (or 10
2, 103). This light emitting diode 101
(Or 102, 103) emits light and executes the display operation only when the alternating voltage of 4 V is forward biased.
【０００４】[0004]
【発明が解決しようとする課題】従来のは以上のように
構成されていたことから、発光ダイオード１０１、１０
２、１０３の消費電力が低く長寿命であるという特性を
有するものの、他の発光機器に比べて輝度特性が劣ると
いう課題を有する。特に、発光ダイオードを交流電流駆
動する場合に、順バイアス時のみ駆動して発光動作を行
なうことから、十分な輝度が得られず、また逆バイアス
時に逆耐電圧の対策として別途に分圧用の回路を追加し
なければならなかった。さらに、商用交流電圧で電源の
供給を受ける場合に、発光ダイオード１０１、１０２、
１０３の所定の駆動電圧とするために前段に変圧器２０
０を接続しなければならず、この変圧器２００の寸法が
大きいことから表示装置自体も大型化するという課題を
有する。The conventional light emitting diodes 101, 10 have the above-described structure.
Although 2 and 103 have characteristics of low power consumption and long life, they have a problem of inferior luminance characteristics as compared with other light emitting devices. In particular, when the light emitting diode is driven by an alternating current, the light emitting operation is performed by driving only in the forward bias, so that sufficient luminance cannot be obtained, and in the case of the reverse bias, a circuit for voltage division is separately provided as a measure against the reverse withstand voltage. Had to add. Further, when the power is supplied by the commercial AC voltage, the light emitting diodes 101, 102,
In order to obtain a predetermined driving voltage of 103, the transformer 20 is provided in the previous stage.
0 must be connected, and since the size of this transformer 200 is large, there is a problem that the display device itself also becomes large.
【０００５】また、遠方側の交流電源５と機器側の変圧
器２００との間に配線される制御線６０、電源線６２に
沿って高圧送電線６が配設されている場合には、この高
圧送電線６の誘起磁界（図中破線で示す）により前記制
御線６０、電源線６２に誘導起電力が生じて発光ダイオ
ード１０１、１０２、１０３が誤点灯するという課題を
有する。In the case where the high voltage power transmission line 6 is arranged along the control line 60 and the power line 62 which are wired between the distant side AC power source 5 and the device side transformer 200, this There is a problem that an induced electromotive force is generated in the control line 60 and the power supply line 62 by the induced magnetic field of the high voltage power transmission line 6 (shown by a broken line in the figure), and the light emitting diodes 101, 102, 103 are erroneously turned on.
【０００６】本発明は前記従来の表示装置の課題を解消
するためになされたもので、発光ダイオードの輝度特性
及び耐久性を向上させ、また発光ダイオードの誤点灯を
防止すると共に装置自体を小型化することのできる表示
装置を提供することを目的とする。The present invention has been made in order to solve the problems of the conventional display device, and improves the luminance characteristics and durability of the light emitting diode, prevents the light emitting diode from being erroneously lit, and downsizes the device itself. It is an object of the present invention to provide a display device that can be used.
【０００７】[0007]
【課題を解決するための手段】図１は本発明の原理説明
図を示す。同図において本発明に係る表示装置は、交流
電源から交流電圧を発光ダイオードに印加して発光表示
する表示装置において、前記発光ダイオードを複数直列
に接続してなる第１の発光部と、前記第１の発光部に対
して並列に接続され、第１の発光部の発光ダイオードの
接続に対して逆バイアスとなるように発光ダイオードを
複数直列に接続してなる第２の発光部と、前記第１及び
第２の各発光部に対して直列に接続され、抵抗及びコン
デンサを直列に接続してなる保護回路とを備え、前記第
１及び第２の各発光部と保護回路とを前記交流電源に直
列接続するものである。FIG. 1 shows the principle of the present invention. In the same drawing, the display device according to the present invention is a display device which applies an AC voltage from an AC power source to a light emitting diode to perform light emission display, and includes a first light emitting portion formed by connecting a plurality of the light emitting diodes in series, A second light emitting unit connected in parallel to the first light emitting unit and having a plurality of light emitting diodes connected in series so as to have a reverse bias with respect to the connection of the light emitting diodes of the first light emitting unit; A protection circuit which is connected in series to each of the first and second light emitting parts and in which a resistor and a capacitor are connected in series, and the first and second light emitting parts and the protection circuit are connected to the AC power supply. To be connected in series.
【０００８】同図において、他の本発明に係る表示装置
は、交流電源から交流電圧を発光ダイオードの表示部に
印加して発光表示する表示装置において、前記表示部に
抵抗を並列に接続してなる誤動作防止部と、前記発光ダ
イオード及び誤動作防止部に対して直列に接続され、抵
抗及びコンデンサを直列に接続してなる保護回路とを備
えるものである。In the figure, another display device according to the present invention is a display device in which an AC voltage is applied from an AC power supply to a display portion of a light emitting diode to perform light emission display, and a resistor is connected in parallel to the display portion. And a protection circuit which is connected in series to the light emitting diode and the malfunction prevention section and which is formed by connecting a resistor and a capacitor in series.
【０００９】また、他の本発明に係る表示装置は必要に
応じて、表示部は一又は複数の発光ダイオードを１組と
し、当該１組の発光ダイオードが逆バイアスとなるよう
に２組の発光ダイオードを並列に接続するものである。Further, in another display device according to the present invention, the display section has one or a plurality of light emitting diodes as one set, and two sets of light emitting devices are set so that the one set of light emitting diodes is reverse biased. The diode is connected in parallel.
【００１０】[0010]
【作用】本発明においては、複数の発光ダイオードを直
列接続してなる第１及び第２の各発光部を各々逆バイア
スとなるように並列接続し、この並列接続の第１及び第
２の各発光部に抵抗及びコンデンサを直列接続してなる
保護回路を直列に接続し、この保護回路と第１及び第２
の各発光部とに交流電源から交流電圧を印加するように
したので、交流電圧の正負のいずれの場合にも第１又は
第２の発光部のいずれかを発光させることになり、表示
灯の輝度を向上させると共に、発光ダイオードの逆耐電
圧の印加を防止する。また、前記保護回路の抵抗により
交流電源からの交流電圧を直列接続される複数の発光ダ
イオードの発光に必要な順電圧値に電圧降下させ、保護
回路のコンデンサにより抵抗の瞬時電力を低く設定でき
ることとなり、保護回路の抵抗を小型化できる。According to the present invention, the first and second light emitting portions formed by connecting a plurality of light emitting diodes in series are connected in parallel so as to be reverse biased, and the first and second light emitting diodes connected in parallel are connected. A protection circuit formed by connecting a resistor and a capacitor in series is connected in series to the light emitting part, and the protection circuit and the first and second protection circuits are connected.
Since an AC voltage is applied from the AC power supply to each of the light emitting parts, the first or second light emitting part is caused to emit light in either case of positive or negative AC voltage. The brightness is improved and application of reverse withstand voltage to the light emitting diode is prevented. Further, the resistance of the protection circuit causes the AC voltage from the AC power supply to drop to a forward voltage value required for light emission of a plurality of light emitting diodes connected in series, and the capacitor of the protection circuit allows the instantaneous power of the resistance to be set low. The resistance of the protection circuit can be reduced.
【００１１】また、他の本発明においては、発光ダイオ
ードの表示部に抵抗からなる誤動作防止部を並列に接続
し、この表示部及び誤動作防止部に抵抗及びコンデンサ
が直列に接続することにより、発光ダイオードに交流電
圧を供給する電源線路に隣接して高圧用送電線が配設さ
れ、この高圧送電線から電源線路に誘導起電力が誘起さ
れた場合においても誤動作防止部の抵抗で誘導起電力を
消費できることとなり、この誤動作防止部に並列接続さ
れた発光部の誤点灯を防止する。According to another aspect of the present invention, a malfunction preventing section made of a resistor is connected in parallel to the display section of the light emitting diode, and a resistor and a capacitor are connected in series to the display section and the malfunction preventing section, thereby emitting light. A high-voltage power transmission line is installed adjacent to the power supply line that supplies an AC voltage to the diode, and even if induced electromotive force is induced from this high-voltage power transmission line to the power supply line, the induced electromotive force is generated by the resistance of the malfunction prevention unit. This can be consumed, and erroneous lighting of the light emitting units connected in parallel to the malfunction prevention unit is prevented.
【００１２】[0012]
【実施例】以下、本発明に一実施例を図２に基づいて説
明する。この図２は本実施例に係る表示装置の回路構成
図を示す。同図において本実施例に係る表示装置は、緑
色表示部１１、保護回路２１及び制御スイッチ３１の直
列回路と、橙色表示部１２、保護回路２２及び制御スイ
ッチ３３の直列回路と、赤色表示部１３、保護回路２３
及び制御スイッチ３３の直列回路とを交流電圧１００Ｖ
を印加する交流電源５に各々並列に接続する構成であ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a circuit configuration diagram of the display device according to this embodiment. In the figure, the display device according to the present embodiment includes a green display section 11, a series circuit of a protection circuit 21 and a control switch 31, an orange display section 12, a series circuit of a protection circuit 22 and a control switch 33, and a red display section 13. , Protection circuit 23
And a series circuit of the control switch 33, AC voltage 100V
It is configured to be connected in parallel to the AC power supplies 5 that apply the.
【００１３】前記緑色表示部１１は、二つの発光ダイオ
ードを同時に順電圧が印加されるように直列に接続して
なる第１の緑色発光部１１ａと、この第１の緑色発光１
１ａの二つの発光ダイオードの接続に対して逆バイアス
となるように二つの発光ダイオードを接続し、この二つ
の発光ダイオードを前記第１の緑色発光部１１ａに対し
て並列に接続してなる第２の緑色発光部１１ｂと、この
第１及び第２の各緑色発光部１１ａ、１１ｂに各々並列
に接続される抵抗からなる誤動作防止部１１ｃとを備え
る構成である。前記橙色（又は赤色）表示部１２（又は
１３）は、前記緑色表示部１１と同様に、第１の橙色
（赤色）発光部１２ａ（又は１３ａ）と、第２の橙色
（赤色）発光部１２ｂ（又は１３ｂ）と、誤動作防止部
１２ｃ（又は１３ｃ）とを各々並列に接続してなる構成
である。The green display unit 11 includes a first green light emitting unit 11a in which two light emitting diodes are connected in series so that a forward voltage is simultaneously applied, and the first green light emitting unit 11a.
A second light-emitting diode connected to the first green light-emitting portion 11a in parallel so that the two light-emitting diodes are connected in reverse bias with respect to the connection of the two light-emitting diodes 1a. The green light emitting section 11b and the malfunction prevention section 11c formed of a resistor connected in parallel to each of the first and second green light emitting sections 11a and 11b. The orange (or red) display section 12 (or 13), like the green display section 11, has a first orange (red) light emitting section 12a (or 13a) and a second orange (red) light emitting section 12b. (Or 13b) and the malfunction prevention unit 12c (or 13c) are connected in parallel.
【００１４】前記保護回路２１（又は２２、２３）は、
抵抗２１Ｒ（又は２２Ｒ、２３Ｒ）と、コンデンサ２１
ｃ（又は２２ｃ、２３ｃ）との直列回路で構成される。
前記制御スイッチ３１（又は３２、３３）は図示を省略
する制御部又は検出部等から出力される制御信号に基づ
いて選択的に投入され、この選定されて投入状態のとき
に交流電源５からの交流電圧を緑色・橙色・赤の各表示
部１１、１２、１３へ印加する構成である。The protection circuit 21 (or 22, 23) is
Resistor 21R (or 22R, 23R) and capacitor 21
c (or 22c, 23c) and a series circuit.
The control switch 31 (or 32, 33) is selectively turned on based on a control signal output from a control unit, a detection unit or the like (not shown). The AC voltage is applied to each of the green, orange, and red display portions 11, 12, 13.
【００１５】次に、前記構成に基づく本実施例に係る表
示装置の表示動作について図３を参照して説明する。こ
の図３は表示装置がある機器側と制御盤がある遠方側と
の接続関係図を示す。まず、遠方側の交流電源５から交
流電圧１００Ｖが緑色・橙色・赤色の各表示部１１、１
２、１３及び保護回路２１、２２、２３に制御スイッチ
３１、３２、３３を介して各々印加された状態となる。
この状態において、例えば制御スイッチ３１が制御信号
により投入されると、交流電圧１００Ｖは保護回路２１
の抵抗２１Ｒにより電圧降下が９２Ｖだけ生じ、残りの
交流電圧の８Ｖが第１（又は第２）の緑色発光部１１ａ
（又は１１ｂ）に印加される。この８Ｖが第１（又は第
２）の緑色発光部１１ａ（又は１１ｂ）の直列に接続さ
れた２つの発光ダイオードに４Ｖづつ分圧されて印加さ
れ、この各４Ｖにより各発光ダイオードを点灯させるこ
ととなる。この第１又は第２の各緑色発光部１１ａ、１
１ｂは交流電圧４Ｖの正負のいずれの場合においてもい
ずれかが点灯し、発光輝度特性を向上させている。Next, the display operation of the display device according to the present embodiment based on the above configuration will be described with reference to FIG. FIG. 3 shows a connection relationship diagram between the device side having the display device and the remote side having the control panel. First, 100V AC voltage from the distant AC power supply 5 is displayed on each of the green, orange, and red display units 11, 1
2 and 13 and the protection circuits 21, 22, and 23 are respectively applied via the control switches 31, 32, and 33.
In this state, for example, when the control switch 31 is turned on by the control signal, the AC voltage 100V is applied to the protection circuit 21.
The resistor 21R causes a voltage drop of 92V, and the remaining AC voltage of 8V is the first (or second) green light emitting portion 11a.
(Or 11b). This 8V is divided by 4V and applied to the two light emitting diodes connected in series of the first (or second) green light emitting portion 11a (or 11b), and each of the 4V lights each light emitting diode. Becomes Each of the first and second green light emitting portions 11a, 1
1b is turned on in both cases of positive and negative AC voltage 4V, and improves the emission luminance characteristic.
【００１６】また、前記保護回路２１の抵抗２１Ｒに直
列に接続されるコンデンサ２１ｃは、この容量値及び抵
抗２１Ｒの抵抗値に基づいて決定される時定数により電
流量を減少させて抵抗２１Ｒの瞬時電力を抑制できるこ
とから、抵抗２１Ｒをコンパクトなものとしている。前
記橙色表示部１２及び保護回路２２、赤色表示部１３及
び保護回路２３は、前記緑色表示部１１及び保護回路２
１と同様に点灯制御動作を実行する。Further, the capacitor 21c connected in series to the resistor 21R of the protection circuit 21 reduces the amount of current by the time constant determined based on the capacitance value and the resistance value of the resistor 21R, and the instantaneous value of the resistor 21R. Since the power can be suppressed, the resistor 21R is made compact. The orange display section 12 and the protection circuit 22, the red display section 13 and the protection circuit 23 are the green display section 11 and the protection circuit 2.
The lighting control operation is executed in the same manner as in 1.
【００１７】さらに、図３に示すように制御盤４に前記
緑色・橙色・赤色の各表示部１１、１２、１３からの制
御線６０が接続され、この制御線６０及び共通電源線６
１の近傍に高圧送電線６が配線されている場合には、こ
の高圧送電線６から誘導電流が制御線６０及び共通電源
線６１に誘起されることがある。この誘導電流は制御信
号線６０−接点ａ（又はｂ、ｃ）−保護回路２１（又は
２２、２３）−第１又は第２の緑（又は橙、赤）の各発
光部１１ａ・１１ｂ（又は１２ａ・１２ｂ、１３ａ・１
３ｂ）−共通電源線６１−制御盤４の電流継電器ＣＲ1
（又はＣＲ2、ＣＲ3）又は表示燈ＳＬ1（又はＳＬ2、Ｓ
Ｌ3）の閉ループに流されることとなる。Further, as shown in FIG. 3, a control line 60 from each of the green, orange, and red display portions 11, 12, 13 is connected to the control panel 4, and the control line 60 and the common power line 6 are connected.
When the high-voltage power transmission line 6 is wired near 1, the induced current may be induced from the high-voltage power transmission line 6 to the control line 60 and the common power supply line 61. This induced current is generated by the control signal line 60-contact point a (or b, c) -protection circuit 21 (or 22, 23) -first or second green (or orange, red) light emitting section 11a, 11b (or 12a / 12b, 13a / 1
3b) -common power supply line 61-current relay CR1 of control panel 4
(Or CR2, CR3) or indicator light SL1 (or SL2, S
L3) is closed loop.
【００１８】この誘起された誘導電流は第１又は第２の
緑（又は橙、赤）色の各発光部１１ａ・１１ｂ（又は１
２ａ・１２ｂ、１３ａ・１３ｂ）に並列に接続された誤
動作防止部１１ｃ（又は１２ｃ、１３ｃ）の抵抗２１Ｒ
（又は２２Ｒ、２３Ｒ）に分流されて減衰する。この減
衰により発光ダイオードに印加される順方向電圧が駆動
電圧以下の値となり前記各発光ダイオードの発光を阻止
して誤点灯を防止している。This induced current is applied to the first or second green (or orange, red) color light emitting portions 11a and 11b (or 1).
2a · 12b, 13a · 13b) and the resistor 21R of the malfunction prevention unit 11c (or 12c, 13c) connected in parallel.
(Or 22R, 23R) is divided and attenuated. Due to this attenuation, the forward voltage applied to the light emitting diode becomes a value equal to or lower than the drive voltage, and the light emission of each of the light emitting diodes is blocked to prevent erroneous lighting.
【００１９】なお、前記実施例においては緑・橙・赤の
各色光を発光するように表示部１１、１２、１３、保護
回路２１、２２、２３及び制御スイッチ３１、３２、３
３を３つ並列に接続する構成としたが、単一又は任意の
複数を並列に接続することもできる。また、表示色も他
の色光を発光するように構成することもできる。In the above embodiment, the display portions 11, 12, 13 and the protection circuits 21, 22, 23 and the control switches 31, 32, 3 are arranged so as to emit green, orange and red color lights.
Although three 3 are connected in parallel, a single or an arbitrary plurality can be connected in parallel. Further, the display color can also be configured to emit light of another color.
【００２０】[0020]
【発明の効果】以上のように本発明においては、複数の
発光ダイオードを直列接続してなる第１及び第２の各発
光部を各々逆バイアスとなるように並列接続し、この並
列接続の第１及び第２の各発光部に抵抗及びコンデンサ
を直列接続してなる保護回路を直列に接続し、この保護
回路と第１及び第２の各発光部とに交流電源から交流電
圧を印加するようにしたので、交流電圧の正負のいずれ
の場合にも第１又は第２の発光部のいずれかを発光させ
ることになり、表示灯の輝度を向上させると共に、発光
ダイオードの逆耐電圧の印加を防止できるという効果を
奏する。また、前記保護回路の抵抗により交流電源から
の交流電圧を直列接続される複数の発光ダイオードの発
光に必要な順電圧値に電圧降下させ、保護回路のコンデ
ンサにより抵抗の瞬時電力を低く設定できることとな
り、保護回路の抵抗を小型化できるという効果を有す
る。また、他の本発明においては、発光ダイオードの表
示部に抵抗からなる誤動作防止部を並列に接続し、この
表示部及び誤動作防止部に抵抗及びコンデンサが直列に
接続することにより、発光ダイオードに交流電圧を供給
する電源線路に隣接して高圧送電線が配設され、この高
圧送電線から電源線路に誘導起電力が誘起された場合に
おいても誤動作防止部の抵抗で誘導起電力を消費できる
こととなり、この誤動作防止部に並列接続された発光部
の誤点灯を防止するという効果を有する。As described above, according to the present invention, the first and second light emitting portions formed by connecting a plurality of light emitting diodes in series are connected in parallel so as to be reverse biased. A protection circuit formed by connecting a resistor and a capacitor in series to each of the first and second light emitting units is connected in series, and an AC voltage is applied from an AC power supply to the protection circuit and each of the first and second light emitting units. Therefore, either of the positive or negative AC voltage causes either the first or second light emitting portion to emit light, which improves the brightness of the indicator lamp and applies the reverse withstand voltage of the light emitting diode. The effect is that it can be prevented. Further, the resistance of the protection circuit causes the AC voltage from the AC power supply to drop to a forward voltage value required for light emission of a plurality of light emitting diodes connected in series, and the capacitor of the protection circuit allows the instantaneous power of the resistance to be set low. The effect is that the resistance of the protection circuit can be reduced. Further, in another aspect of the present invention, a malfunction prevention unit formed of a resistor is connected in parallel to the display unit of the light emitting diode, and a resistor and a capacitor are connected in series to the display unit and the malfunction prevention unit, so that an alternating current is applied to the light emitting diode. A high-voltage transmission line is arranged adjacent to a power supply line that supplies a voltage, and even when an induced electromotive force is induced from this high-voltage transmission line to the power supply line, the resistance of the malfunction prevention unit can consume the induced electromotive force. This has the effect of preventing erroneous lighting of the light emitting units connected in parallel to the malfunction prevention unit.
【図１】本発明の表示装置の原理説明図である。FIG. 1 is a diagram illustrating the principle of a display device of the present invention.
【図２】本発明の一実施例に係る表示装置の回路構成図
である。FIG. 2 is a circuit configuration diagram of a display device according to an embodiment of the present invention.
【図３】本発明の一実施例に係る表示装置がある機器側
と制御盤がある遠方側との接続関係図である。FIG. 3 is a connection diagram of a device side including a display device according to an embodiment of the present invention and a remote side including a control panel.
【図４】従来の表示装置の回路構成図である。FIG. 4 is a circuit configuration diagram of a conventional display device.
１ａ 第１の発光部 １ｂ 第２の発光部 ２ 保護回路 ４ 制御盤 ５ 交流電源 ６ 高圧送電線 １１（１２、１３） 緑色（橙色、赤色）表示部 １１ａ（１２ａ、１３ａ） 第１の緑色（橙色、赤色）
発光部 １１ｂ（１２ｂ、１３ｂ） 第２の緑色（橙色、赤色）
発光部 １１ｂ（１２ａ、１３ａ） 誤動作防止回路 ２１、２２、２３ 保護回路 ３１、３２、３３ 制御スイッチ ６０ 制御線 ６１ 共通電源線 ６２ 電源線1a 1st light emission part 1b 2nd light emission part 2 Protection circuit 4 Control panel 5 AC power supply 6 High voltage power transmission line 11 (12, 13) Green (orange, red) display part 11a (12a, 13a) 1st green ( Orange, red)
Light emitting part 11b (12b, 13b) Second green (orange, red)
Light emitting portion 11b (12a, 13a) Malfunction prevention circuit 21, 22, 23 Protection circuit 31, 32, 33 Control switch 60 Control line 61 Common power supply line 62 Power supply line
Claims (3)
に印加して発光表示する表示装置において、 前記発光ダイオードを複数直列に接続してなる第１の発
光部と、 前記第１の発光部に対して並列に接続され、第１の発光
部の発光ダイオードの接続に対して逆バイアスとなるよ
うに発光ダイオードを複数直列に接続してなる第２の発
光部と、 前記第１及び第２の各発光部に対して直列に接続され、
抵抗及びコンデンサを直列に接続してなる保護回路とを
備え、 前記第１及び第２の各発光部と保護回路とを前記交流電
源に直列接続することを特徴とする表示装置。1. A display device that applies an AC voltage from an AC power source to a light emitting diode to perform light emission display, wherein a first light emitting section is formed by connecting a plurality of the light emitting diodes in series, and a first light emitting section is provided. A second light emitting portion connected in parallel and connected in series so as to have a reverse bias with respect to the connection of the light emitting diode of the first light emitting portion, and each of the first and second light emitting portions. Connected in series to the light emitting part,
A display device comprising a protection circuit formed by connecting a resistor and a capacitor in series, wherein the first and second light emitting units and the protection circuit are connected in series to the AC power supply.
の表示部に印加して発光表示する表示装置において、 前記表示部に抵抗を並列に接続してなる誤動作防止部
と、 前記発光ダイオード及び誤動作防止部に対して直列に接
続され、抵抗及びコンデンサを直列に接続してなる保護
回路とを備えることを特徴とする表示装置。2. A display device for applying an AC voltage from an AC power supply to a display unit of a light emitting diode to perform light emission display, a malfunction prevention unit including a resistor connected in parallel to the display unit, the light emitting diode and malfunction prevention unit. And a protection circuit that is connected in series to the unit and that includes a resistor and a capacitor connected in series.
て、 前記表示部は一又は複数の発光ダイオードを１組とし、
当該１組の発光ダイオードが逆バイアスとなるように２
組の発光ダイオードを並列に接続することを特徴とする
表示装置。3. The display device according to claim 2, wherein the display unit includes one or a plurality of light emitting diodes as one set,
2 so that the pair of light emitting diodes are reverse biased
A display device comprising a set of light emitting diodes connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30547394A JPH08137429A (en) | 1994-11-14 | 1994-11-14 | Display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30547394A JPH08137429A (en) | 1994-11-14 | 1994-11-14 | Display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08137429A true JPH08137429A (en) | 1996-05-31 |
Family
ID=17945583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30547394A Pending JPH08137429A (en) | 1994-11-14 | 1994-11-14 | Display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08137429A (en) |
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