JPH04303884A - Led lighting circuit - Google Patents

Led lighting circuit

Info

Publication number
JPH04303884A
JPH04303884A JP3093080A JP9308091A JPH04303884A JP H04303884 A JPH04303884 A JP H04303884A JP 3093080 A JP3093080 A JP 3093080A JP 9308091 A JP9308091 A JP 9308091A JP H04303884 A JPH04303884 A JP H04303884A
Authority
JP
Japan
Prior art keywords
led
circuit
current
led group
group drive
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
JP3093080A
Other languages
Japanese (ja)
Inventor
Masanobu Miura
三浦 正信
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.)
Takiron Co Ltd
Original Assignee
Takiron 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 Takiron Co Ltd filed Critical Takiron Co Ltd
Priority to JP3093080A priority Critical patent/JPH04303884A/en
Publication of JPH04303884A publication Critical patent/JPH04303884A/en
Pending legal-status Critical Current

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  • Led Devices (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PURPOSE:To suppress the increment of the current when the LED elements of a large number of LED driving circuits are lit by connecting plural pairs of LED group driving circuits to a power source via a common current adjusting resistor. CONSTITUTION:In a LED lighting circuit in which the plural pairs of LED group driving circuits 3 consisting of plural LED elements 1R. 1G, and 1B and a switch circuit 2 which controls to put on/off those LED elements 1R, 1G, and 1B simultaneously are connected to the power source 4, respectively, the plural LED group driving circuits 3 are connected in parallel with each other. At parallel circuits consisting of the plural LED group driving circuit 3, a terminal on one side is connected to the pole on one side of the power source 4, and also, another terminal on the other side is connected to the pole on the other side of the power source 4 via the current adjusting resistor RC. Therefore, it follows that the current on each LED group driving circuit 3 flows via the common current adjusting resistor, and a current value can be suppressed.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、基板上に多数のLED
素子を配置して文字や図形等の表示を行うLED表示装
置において、各LED素子を点灯制御するためのLED
点灯回路に関する。
[Industrial Application Field] The present invention provides a method for displaying a large number of LEDs on a substrate.
In an LED display device that displays characters, figures, etc. by arranging elements, an LED for controlling the lighting of each LED element.
Regarding lighting circuits.

【0002】0002

【従来の技術】基板上に多数配置したLED素子を点灯
制御して文字や図形を表示するLED表示装置が従来か
ら各分野で用いられている。そして、このような表示を
大画面でカラー表示する場合には、例えば図3に示すよ
うに、文字や図形を構成する1ドット分の発光領域10
にRGB(赤,緑及び青)3原色のLED素子1R ,
1G ,1B をそれぞれの色ごとに複数個ずつ配置し
ている。
2. Description of the Related Art LED display devices that display characters and figures by controlling the lighting of a large number of LED elements arranged on a substrate have been used in various fields. When displaying such a display in color on a large screen, for example, as shown in FIG.
RGB (red, green, and blue) three primary color LED elements 1R,
A plurality of 1G and 1B are arranged for each color.

【0003】上記LED表示装置の各発光領域10にお
ける従来のLED点灯回路は、図4に示すように、各色
ごとの複数個ずつのLED素子1R ,1G ,1B 
をスイッチ回路2と共に直列に接続してそれぞれの発光
色のLED群駆動回路3を構成すると共に、これらのL
ED群駆動回路3を電源4に対して並列に接続している
。この結果、各LED群駆動回路3のスイッチ回路2を
制御することにより、同一色のLED素子1は同時に点
灯されるので、大画面の各ドットを構成する発光領域1
0の輝度を高めることができるようになり、また、異な
る色のLED素子1は個別に点灯させることができるの
で、各発光領域10の点灯色を任意に変化させることが
可能となる。なお、各LED群駆動回路3におけるLE
D素子1R ,1G ,1B とスイッチ回路2との間
には、それぞれ電流安定化抵抗RR ,RG ,RB 
が接続され、これらLED素子1R ,1G ,1B 
に流れる電流の安定化を図っている。
A conventional LED lighting circuit in each light emitting region 10 of the LED display device includes a plurality of LED elements 1R, 1G, 1B for each color, as shown in FIG.
are connected in series with the switch circuit 2 to configure the LED group drive circuit 3 for each luminescent color, and these L
The ED group drive circuit 3 is connected in parallel to the power supply 4. As a result, by controlling the switch circuit 2 of each LED group drive circuit 3, the LED elements 1 of the same color are lit at the same time.
Since the brightness of 0 can be increased and the LED elements 1 of different colors can be lit individually, it is possible to arbitrarily change the lighting color of each light emitting area 10. Note that the LEDs in each LED group drive circuit 3
Current stabilizing resistors RR, RG, RB are provided between the D elements 1R, 1G, 1B and the switch circuit 2, respectively.
are connected, and these LED elements 1R, 1G, 1B
The aim is to stabilize the current flowing through the

【0004】0004

【発明が解決しようとする課題】ところが、このような
LED点灯回路では、いずれか1のLED群駆動回路3
のスイッチ回路2をオンにして1種類の色のLED素子
1のみを点灯させる場合と、2つのLED群駆動回路3
を組み合わせて2種類の色の混合色で点灯する場合と、
3種類全部による白色点灯とする場合の3種類の使い方
がある。そして、1種類の色のLED素子1のみを点灯
した場合に比べ3種類全部を点灯した場合には、このL
ED点灯回路に各LED群駆動回路3ごとの電流を加算
した3倍の電流が流れることになり、これによる発熱量
の比は電流の2乗に比例するため9倍にも達する。
[Problems to be Solved by the Invention] However, in such an LED lighting circuit, any one of the LED group driving circuits 3
When the switch circuit 2 is turned on and only the LED elements 1 of one color are lit, and when the two LED group drive circuits 3
When lighting in a mixed color of two types of colors,
There are three ways to use all three types of white lighting. Compared to the case where only one type of color LED element 1 is lit, when all three types are lit, this L
A current three times the sum of the current for each LED group driving circuit 3 flows through the ED lighting circuit, and the ratio of the amount of heat generated by this is proportional to the square of the current, so it reaches nine times as much.

【0005】このため、従来のLED点灯回路は、1種
類の色のLED素子1のみを点灯させたときに十分な輝
度が得られるような電流を供給できる設定を行うと、3
種類のLED素子1を全部点灯したときの発熱量が大き
くなり過ぎるので、これを効率よく放熱して温度上昇を
抑制するための構造が必要になり、設計上の制約が多く
なると共に、装置のコストアップにも繋がるという問題
が発生していた。
Therefore, if the conventional LED lighting circuit is set so that it can supply a current that provides sufficient brightness when only the LED elements 1 of one color are lit, the
Since the amount of heat generated when all types of LED elements 1 are turned on is too large, a structure is required to efficiently dissipate this heat and suppress the temperature rise, which increases design constraints and increases device efficiency. A problem has arisen that leads to an increase in costs.

【0006】[0006]

【課題を解決するための手段】上記課題を解決するため
に、本発明は、複数個のLED素子とこれらのLED素
子を同時に点灯又は消灯制御するスイッチ回路とからな
るLED群駆動回路をさらに複数組それぞれ電源に接続
したLED点灯回路において、複数組のLED群駆動回
路を共通の電流調整抵抗を介して電源に接続したことを
特徴としている。
[Means for Solving the Problems] In order to solve the above problems, the present invention further includes a plurality of LED group drive circuits each including a plurality of LED elements and a switch circuit that simultaneously controls turning on or turning off these LED elements. In the LED lighting circuit, each set of which is connected to a power source, a plurality of sets of LED group drive circuits are connected to the power source via a common current adjustment resistor.

【0007】[0007]

【作用】上記LED群駆動回路がそれぞれ1つの電源に
並列に接続され、又は、それぞれの電源に独立して接続
されている場合には、スイッチ回路によってLED素子
を点灯させたLED群駆動回路の数に比例して電流も増
加することになる。しかしながら、上記構成のLED点
灯回路によれば、各LED群駆動回路の電流は、共通の
電流調整抵抗を通じて流れることになる。従って、1の
LED群駆動回路にのみ電流が流れている場合に比べて
2つの同一特性のLED群駆動回路に電流が流れた場合
には、これらのLED群駆動回路に共通に接続された電
流調整抵抗によって電流値が2倍に達することがなくな
り、それよりも少ない値に抑制される。また、3つ以上
のLED群駆動回路に同時に電流が流れた場合にも、同
様にその数に比例した値よりも少ない電流値に抑制され
ることになる。
[Operation] When each of the above LED group drive circuits is connected in parallel to one power source or independently connected to each power source, the LED group drive circuit that lights up the LED elements by the switch circuit. The current will also increase in proportion to the number. However, according to the LED lighting circuit configured as described above, the current of each LED group drive circuit flows through a common current adjustment resistor. Therefore, compared to when current flows only through one LED group drive circuit, when current flows through two LED group drive circuits with the same characteristics, the current commonly connected to these LED group drive circuits increases. The adjustment resistor prevents the current value from doubling, but suppresses it to a smaller value. Further, even when current flows simultaneously to three or more LED group drive circuits, the current value is similarly suppressed to a value smaller than the value proportional to the number of LED group drive circuits.

【0008】ただし、この電流をあまり抑制すると、多
数のLED群駆動回路のLED素子が点灯した場合に、
各LED群駆動回路に流れる電流が小さくなり、LED
素子の輝度が低下し過ぎる。従って、本発明のLED点
灯回路による電流値の増加の割り合いは、例えば3つの
LED群駆動回路が共通の電流調整抵抗を介して電源に
接続されている場合には、1のLED群駆動回路のLE
D素子のみを点灯した場合に流れる電流を100%とし
て、2つのLED群駆動回路の場合に流れる電流を14
0%〜160%(各LED群駆動回路には70%〜80
%)とし、全てのLED群駆動回路の場合に流れる電流
を150%〜210%(各LED群駆動回路には50%
〜70%)程度とするのが適当である。
However, if this current is suppressed too much, when many LED elements of the LED group drive circuit turn on,
The current flowing through each LED group drive circuit becomes smaller, and the LED
The brightness of the element decreases too much. Therefore, the rate of increase in current value due to the LED lighting circuit of the present invention is, for example, when three LED group drive circuits are connected to a power supply via a common current adjustment resistor, one LED group drive circuit LE of
The current that flows when only the D element is lit is 100%, and the current that flows when two LED group drive circuits are used is 14%.
0% to 160% (70% to 80% for each LED group drive circuit)
%), and the current flowing in all LED group drive circuits is 150% to 210% (50% to each LED group drive circuit).
~70%) is appropriate.

【0009】この結果、本発明のLED点灯回路によれ
ば、1のLED群駆動回路のみのLED素子を点灯する
場合に十分な輝度で発光させ得る電流を供給しながら、
多数のLED群駆動回路が同時にLEDを点灯させた場
合にも、電流の総量を抑制して発熱量が大きくなり過ぎ
ないようにすることができる。
As a result, according to the LED lighting circuit of the present invention, when lighting the LED elements of only one LED group drive circuit, while supplying a current that can cause the LED elements to emit light with sufficient brightness,
Even when a large number of LED group drive circuits turn on the LEDs at the same time, the total amount of current can be suppressed to prevent the amount of heat generated from becoming too large.

【0010】0010

【実施例】以下、図面を参照しながら、本発明の実施例
を詳述する。
Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

【0011】図1は本発明の一実施例を示すものであっ
て、LED点灯回路の回路図である。なお、前記図4に
示した従来例と同様の機能を有する構成部材には同じ番
号を付記する。
FIG. 1 shows one embodiment of the present invention, and is a circuit diagram of an LED lighting circuit. Note that the same numbers are added to the structural members having the same functions as those of the conventional example shown in FIG. 4.

【0012】本実施例は、前記図3に示したLED表示
装置における各発光領域10の3色のLED素子1R 
,1G ,1B を点灯制御するLED点灯回路につい
て説明する。赤色の複数のLED素子1R は、それぞ
れが直列に接続されると共に、電流安定化抵抗RR と
スイッチ回路2とも直列に接続され、赤色の点灯を行う
LED群駆動回路3を構成している。また、緑色の複数
のLED素子1G も、それぞれが直列に接続されると
共に、電流安定化抵抗RG と上記とは別のスイッチ回
路2とも直列に接続され、緑色の点灯を行うLED群駆
動回路3を構成している。さらに、青色の複数のLED
素子1B も、それぞれが直列に接続されると共に、電
流安定化抵抗RG とさらに別のスイッチ回路2とも直
列に接続され、青色の点灯を行うLED群駆動回路3を
構成している。
In this embodiment, three color LED elements 1R of each light emitting area 10 in the LED display device shown in FIG.
, 1G, 1B will be described. The plurality of red LED elements 1R are each connected in series, and are also connected in series with the current stabilizing resistor RR and the switch circuit 2, forming an LED group drive circuit 3 that lights up in red. Further, the plurality of green LED elements 1G are each connected in series, and are also connected in series with a current stabilizing resistor RG and a switch circuit 2 different from the above, and an LED group drive circuit 3 for lighting green. It consists of Additionally, multiple blue LEDs
The elements 1B are also connected in series, and are also connected in series with the current stabilizing resistor RG and another switch circuit 2, forming an LED group drive circuit 3 that lights up in blue.

【0013】上記各LED群駆動回路3のスイッチ回路
2は、有接点のリレー等を用いることも可能ではあるが
、実際には、スイッチングトランジタやIC等による無
接点スイッチ回路によって構成される。また、各電流安
定化抵抗RR ,RG ,RB は、それぞれのLED
素子1R ,1G ,1B の特性のバラツキを緩和し
、電流を安定化させるためのものである。
The switch circuit 2 of each of the LED group drive circuits 3 may use a contact relay or the like, but in reality, it is constituted by a non-contact switch circuit using a switching transistor, an IC, or the like. In addition, each current stabilizing resistor RR, RG, RB is connected to each LED.
This is to alleviate variations in the characteristics of the elements 1R, 1G, and 1B and stabilize the current.

【0014】上記3種類のLED群駆動回路3は、互い
に並列に接続されている。また、これらLED群駆動回
路3による並列回路は、一方の端子が電源4の一方の極
に接続されると共に、他方の端子が電流調整抵抗RC 
を介して電源4の他方の極に接続されている。
The above three types of LED group drive circuits 3 are connected in parallel to each other. Furthermore, in the parallel circuit formed by these LED group drive circuits 3, one terminal is connected to one pole of the power supply 4, and the other terminal is connected to the current adjustment resistor RC.
It is connected to the other pole of the power supply 4 via.

【0015】上記構成のLED点灯回路は、各LED群
駆動回路3のスイッチ回路2がコンピュータ(不図示)
によってオンオフを制御され、同じ色のLED素子1は
同時に点灯又は消灯し、異なる色のLED素子1R ,
1G ,1B は個別に点灯又は消灯を制御されること
になる。従って、このようなLED点灯回路によって各
ドットを構成する発光領域10の点灯制御を行うことに
より、大画面に文字や図形等をカラーによって表示する
ことが可能となる。
In the LED lighting circuit having the above configuration, the switch circuit 2 of each LED group drive circuit 3 is connected to a computer (not shown).
The on/off is controlled by the LED elements 1 of the same color are turned on or off at the same time, and the LED elements 1R of different colors are turned on or off at the same time.
1G and 1B are individually controlled to turn on or off. Therefore, by controlling the lighting of the light emitting regions 10 forming each dot using such an LED lighting circuit, it becomes possible to display characters, figures, etc. in color on a large screen.

【0016】また、例えば、上記構成のLED点灯回路
における電源4の電圧を20V,電流調整抵抗RC を
300Ωとし、各LED群駆動回路3におけるLED素
子1R,1G ,1B の直列回路の順方向等価内部抵
抗(受動素子として考えた場合の内部抵抗)を400Ω
,各電流安定化抵抗RR ,RG ,RB を300Ω
とすると、スイッチ回路2の制御によりいずれか1のL
ED群駆動回路3のLED素子1のみを点灯させた場合
、全合成抵抗が1kΩとなるので、20mAの電流が流
れる。ところが、いずれか2つのLED群駆動回路3の
LED素子1を点灯させた場合には、全合成抵抗が65
0Ωとなるため、LED点灯回路全体に流れる電流は3
0.8mAとなって、上記20mAの1.5倍程度しか
増加しない。 また、全てのLED群駆動回路3のLED素子1R ,
1G ,1B を点灯させた場合にも、全合成抵抗が約
533Ωとなるため、LED点灯回路全体を流れる電流
は約37.5mAとなって、上記20mAの1.9倍弱
の増加となる。従って、このLED点灯回路における1
色と3色の点灯時の発熱量の比も4倍に満たないものと
なり、熱対策にも余裕を持った設計を行うことができる
ようになる。
Further, for example, if the voltage of the power supply 4 in the LED lighting circuit of the above configuration is 20V and the current adjustment resistor RC is 300Ω, the forward equivalent of the series circuit of the LED elements 1R, 1G, 1B in each LED group drive circuit 3 is calculated as follows. Internal resistance (internal resistance when considered as a passive element) is 400Ω
, each current stabilizing resistor RR, RG, RB is 300Ω.
Then, by controlling the switch circuit 2, any one of L
When only the LED element 1 of the ED group drive circuit 3 is turned on, the total combined resistance is 1 kΩ, so a current of 20 mA flows. However, when the LED elements 1 of any two LED group drive circuits 3 are turned on, the total combined resistance becomes 65
Since it is 0Ω, the current flowing through the entire LED lighting circuit is 3
The current is 0.8 mA, which is an increase of only about 1.5 times the above 20 mA. In addition, the LED elements 1R of all the LED group drive circuits 3,
Even when 1G and 1B are lit, the total combined resistance is about 533Ω, so the current flowing through the entire LED lighting circuit is about 37.5mA, which is an increase of slightly less than 1.9 times the above 20mA. Therefore, 1 in this LED lighting circuit.
The ratio of the amount of heat generated when the three colors are lit is less than four times that of the previous one, making it possible to design a device with more leeway in terms of heat countermeasures.

【0017】なお、上記各点灯状態のときに各LED群
駆動回路3ごとに流れる電流は、それぞれ20mA,1
5.4mA及び12.5mAとなって徐々に少なくなる
。しかしながら、点灯するLED素子1の数は増加する
ので、発光領域10全体としては輝度が低下するような
おそれは生じない。
It should be noted that the current flowing through each LED group drive circuit 3 during each of the above lighting states is 20 mA and 1 mA, respectively.
It gradually decreases to 5.4mA and 12.5mA. However, since the number of LED elements 1 that are lit increases, there is no fear that the brightness of the light emitting area 10 as a whole will decrease.

【0018】図2は、本発明の他の実施例を示すもので
ある。なお、ここでも前記図4に示した従来例と同様の
機能を有する構成部材には同じ番号を付記している。
FIG. 2 shows another embodiment of the invention. It should be noted that here as well, the same numbers are added to the constituent members having the same functions as those of the conventional example shown in FIG. 4.

【0019】この実施例では、各LED群駆動回路3に
おける同一色のLED素子1をさらに2群に分割し、そ
れぞれ電流安定化抵抗RR ,RG ,RB と共に直
列に接続すると共に、これら2群のLED素子1を並列
に接続している。ただし、この場合も、2群のLED素
子1の並列回路は、それぞれのLED群駆動回路3のス
イッチ回路2に直列に接続されているので、これらのス
イッチ回路2によってLED群駆動回路3ごとに一括し
て点灯制御されることになる。そして、このように構成
された3種類のLED群駆動回路3も、上記図1に示し
た実施例と同様に、互いに並列に接続されると共に、電
流調整抵抗RC を介して電源4に接続されている。
In this embodiment, the LED elements 1 of the same color in each LED group drive circuit 3 are further divided into two groups, each of which is connected in series with current stabilizing resistors RR, RG, and RB. LED elements 1 are connected in parallel. However, in this case as well, the parallel circuits of the two groups of LED elements 1 are connected in series to the switch circuits 2 of the respective LED group drive circuits 3. The lighting will be controlled all at once. The three types of LED group drive circuits 3 configured in this way are also connected in parallel to each other and connected to the power source 4 via the current adjustment resistor RC, similarly to the embodiment shown in FIG. ing.

【0020】この結果、本実施例のLED点灯回路にお
いても、LED群駆動回路3によって点灯されるLED
素子1R ,1G ,1B の種類を増やした場合の電
流の増加を抑制することができるようになる。
As a result, also in the LED lighting circuit of this embodiment, the LEDs lit by the LED group drive circuit 3
It becomes possible to suppress an increase in current when the types of elements 1R, 1G, and 1B are increased.

【0021】なお、上記実施例は、いずれも1の電源4
に3種類のLED群駆動回路3を接続した場合について
示したが、それぞれのLED群駆動回路3を別の電源に
接続するLED点灯回路についても本発明を同様に実施
することが可能である。ただし、このように電源を別に
する場合には、例えば接地側の電源のみを共通として、
各LED群駆動回路3の接地側の端子を互いに接続した
上で電流調整抵抗RCを介して接地するように配線する
必要がある。
[0021] In each of the above embodiments, one power supply 4 is used.
Although the case where three types of LED group drive circuits 3 are connected is shown in FIG. 1, the present invention can be implemented in the same way with an LED lighting circuit in which each LED group drive circuit 3 is connected to a different power source. However, if you use separate power supplies like this, for example, you can use only the grounding power supply in common.
It is necessary to connect the ground side terminals of each LED group drive circuit 3 to each other and to connect them to the ground via the current adjustment resistor RC.

【0022】[0022]

【発明の効果】以上の説明から明らかなように、本発明
のLED点灯回路は、多数のLED群駆動回路のLED
素子を点灯させた場合であっても、これらのLED群駆
動回路に共通して接続された電流調整抵抗によって電流
の増加を抑制することができるので、発熱量を低減させ
て装置のコストダウンと設計上の自由度を高めることが
できるという効果を奏する。
Effects of the Invention As is clear from the above description, the LED lighting circuit of the present invention can
Even when the elements are turned on, the increase in current can be suppressed by the current adjustment resistor commonly connected to these LED group drive circuits, reducing the amount of heat generated and reducing the cost of the device. This has the effect of increasing the degree of freedom in design.

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

【図1】本発明の一実施例を示すものであって、LED
点灯回路の回路図である。
FIG. 1 shows an embodiment of the present invention, in which an LED
It is a circuit diagram of a lighting circuit.

【図2】本発明の他の実施例を示すものであって、LE
D点灯回路の回路図である。
FIG. 2 shows another embodiment of the present invention, in which LE
It is a circuit diagram of a D lighting circuit.

【図3】LED表示装置の各ドットを構成する発光領域
におけるLED素子の配置を示す図である。
FIG. 3 is a diagram showing the arrangement of LED elements in a light emitting region constituting each dot of an LED display device.

【図4】従来例を示すものであって、LED点灯回路の
回路図である。
FIG. 4 is a circuit diagram of an LED lighting circuit, showing a conventional example.

【符号の説明】[Explanation of symbols]

1  LED素子 2  スイッチ回路 3  LED群駆動回路 4  電源 RC 電流調整抵抗 1 LED element 2 Switch circuit 3 LED group drive circuit 4 Power supply RC current adjustment resistance

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】複数個のLED素子とこれらのLED素子
を同時に点灯又は消灯制御するスイッチ回路とからなる
LED群駆動回路をさらに複数組それぞれ電源に接続し
たLED点灯回路において、複数組のLED群駆動回路
を共通の電流調整抵抗を介して電源に接続したことを特
徴とするLED点灯回路。
1. An LED lighting circuit comprising a plurality of LED group drive circuits each connected to a power source, each of which includes a plurality of LED elements and a switch circuit that simultaneously controls lighting or extinguishment of these LED elements. An LED lighting circuit characterized in that a drive circuit is connected to a power source via a common current adjustment resistor.
JP3093080A 1991-03-30 1991-03-30 Led lighting circuit Pending JPH04303884A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3093080A JPH04303884A (en) 1991-03-30 1991-03-30 Led lighting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3093080A JPH04303884A (en) 1991-03-30 1991-03-30 Led lighting circuit

Publications (1)

Publication Number Publication Date
JPH04303884A true JPH04303884A (en) 1992-10-27

Family

ID=14072544

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3093080A Pending JPH04303884A (en) 1991-03-30 1991-03-30 Led lighting circuit

Country Status (1)

Country Link
JP (1) JPH04303884A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07226536A (en) * 1994-02-14 1995-08-22 Stanley Electric Co Ltd Led color information display board
JP2005000592A (en) * 2003-06-16 2005-01-06 Sanyo Product Co Ltd Game machine
US20190088841A1 (en) * 2017-09-20 2019-03-21 Harvatek Corporation Light emitting diode package

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07226536A (en) * 1994-02-14 1995-08-22 Stanley Electric Co Ltd Led color information display board
JP2005000592A (en) * 2003-06-16 2005-01-06 Sanyo Product Co Ltd Game machine
US20190088841A1 (en) * 2017-09-20 2019-03-21 Harvatek Corporation Light emitting diode package
US10355185B2 (en) * 2017-09-20 2019-07-16 Harvatek Corporation Light emitting diode array package having a plurality of power source signals without limiting resistor

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