JPH06208335A - Three color light emitting display device - Google Patents
Three color light emitting display deviceInfo
- Publication number
- JPH06208335A JPH06208335A JP191993A JP191993A JPH06208335A JP H06208335 A JPH06208335 A JP H06208335A JP 191993 A JP191993 A JP 191993A JP 191993 A JP191993 A JP 191993A JP H06208335 A JPH06208335 A JP H06208335A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- constant current
- circuit
- current circuit
- 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.)
- Granted
Links
- 239000003086 colorant Substances 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Control Of El Displays (AREA)
- Led Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、発光チップを使用した
表示装置に関し、特に青色、緑色、赤色の異なった発光
色を持つ発光チップを有する三色発光表示装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device using a light emitting chip, and more particularly to a three-color light emitting display device having a light emitting chip having different emission colors of blue, green and red.
【０００２】[0002]
【従来の技術】従来の三色発光表示装置Ｍは、図８〜１
０の如く、青色、緑色、赤色の三色の異なる発光色の発
光チップ１，２，３と、発光チップ１，２，３を駆動す
る外部駆動回路４から構成されていた。2. Description of the Related Art A conventional three-color light emitting display device M is shown in FIGS.
0, the light-emitting chips 1, 2, and 3 emit light of three different colors of blue, green, and red, and the external drive circuit 4 that drives the light-emitting chips 1, 2, and 3.
【０００３】外部駆動回路４は、各発光チップ１，２，
３に電流を印加する定電流回路５と、点灯させたい発光
色の発光チップ１，２，３を選択するためのスイッチ回
路６と、スイッチ回路６を制御する制御回路７とを備え
ていた。The external drive circuit 4 includes light emitting chips 1, 2,
There was provided a constant current circuit 5 for applying a current to the switch 3, a switch circuit 6 for selecting the light emitting chips 1, 2, 3 of the emission color to be turned on, and a control circuit 7 for controlling the switch circuit 6.
【０００４】また、発光チップ１，２，３の明るさを変
えるためには、定電流回路５の電流値を変化させてい
た。In order to change the brightness of the light emitting chips 1, 2, 3, the current value of the constant current circuit 5 is changed.
【０００５】[0005]
【発明が解決しようとする課題】従来の三色発光表示装
置Ｍでは、各発光色の発光チップ１，２，３の発光量
（明るさ）を変えるために、定電流回路５から供給され
る電流を変化させる必要がある。そうすると、定電流回
路５の回路定数を変更する等の微妙な調整が困難で、三
色を均等に混ぜ合わせた中間色の作成が困難となる。In the conventional three-color light emitting display device M, the constant current circuit 5 supplies the light in order to change the light emission amount (brightness) of the light emitting chips 1, 2, 3 of each light emission color. The current needs to be changed. Then, it is difficult to make a delicate adjustment such as changing the circuit constant of the constant current circuit 5, and it is difficult to create an intermediate color in which the three colors are evenly mixed.
【０００６】また、中間色や混合色を発生するには、ス
イッチ回路６の三個のスイッチ６ａ〜６ｃの組み合わせ
によって、発光色（色調）を変えることで行うが、その
ためには相当複雑な動作が必要となり、制御回路７の制
御プログラムが複雑化してしまう。Further, in order to generate the intermediate color or the mixed color, the light emission color (color tone) is changed by the combination of the three switches 6a to 6c of the switch circuit 6, but this requires a considerably complicated operation. It becomes necessary and the control program of the control circuit 7 becomes complicated.
【０００７】そして、三色の発光チップ１，２，３を一
組として、これを多数組用いてドットマトリックスなど
の表示板を作成する場合、表示を駆動制御する回路は相
当複雑かつ大規模となるといった問題点がある。When a display panel such as a dot matrix is manufactured by using a large number of three color light emitting chips 1, 2, and 3 as a set, the circuit for driving and controlling the display is considerably complicated and large-scaled. There is a problem that becomes.
【０００８】本発明は、上記課題に鑑み、駆動回路を外
部のデジタル信号で制御することによって、発光量およ
び発光色を簡単にかつ正確に変えることができる三色発
光表示装置の提供を目的とする。In view of the above problems, the present invention has an object of providing a three-color light emitting display device capable of easily and accurately changing the light emission amount and the light emission color by controlling a drive circuit with an external digital signal. To do.
【０００９】[0009]
【課題を解決するための手段】本発明による課題解決手
段は、図１の如く、青色、緑色、赤色の三色の異なる発
光色の発光チップ１１，１２，１３を一組とした発光部
１４（ドット）が複数組設けられ、該各発光部１４の各
発光チップ１１，１２，１３に電流Ｉ０を供給する定電
流回路１５と、該定電流回路１５からいずれの発光部１
４に電流を供給すればよいかを選択する選択手段１６
と、外部からのデジタル入力信号に基づいて設定した基
準電圧Ｖｒｅｆを前記定電流回路１５に印加するデジタ
ル／アナログ変換器（以下、Ｄ／Ａ変換器と略す）１７
とが設けられたものである。As shown in FIG. 1, a means for solving the problems according to the present invention comprises a light emitting section 14 including a set of light emitting chips 11, 12, 13 of three different emission colors of blue, green and red. A plurality of sets of (dots) are provided, and a constant current circuit 15 for supplying a current I 0 to each light emitting chip 11, 12, 13 of each light emitting section 14, and any light emitting section 1 from the constant current circuit
Selection means 16 for selecting whether or not to supply current to 4
And a digital / analog converter (hereinafter abbreviated as D / A converter) 17 for applying a reference voltage Vref set based on a digital input signal from the outside to the constant current circuit 15.
And are provided.
【００１０】[0010]
【作用】上記課題解決手段において、まず、外部からＤ
／Ａ変換器１７へデジタル入力信号を入力する。Ｄ／Ａ
変換器１７は、これをＤ／Ａ変換し、定電流回路１５に
基準電圧Ｖｒｅｆを印加する。定電流回路１５は電流Ｉ
０を変化させ、これに比例して各発光チップ１１，１
２，１３の明るさが決まる。したがって、外部からのデ
ジタル入力信号を変えることで、各発光部１４の明るさ
（発光量）および発光色（色調）を正確にかつ簡単に制
御できる。In the above means for solving problems, first, D
The digital input signal is input to the / A converter 17. D / A
The converter 17 D / A-converts this and applies the reference voltage Vref to the constant current circuit 15. The constant current circuit 15 has a current I
0 is changed, and each light emitting chip 11, 1 is proportionally changed.
The brightness of 2 and 13 is decided. Therefore, the brightness (emission amount) and the emission color (color tone) of each light emitting unit 14 can be accurately and easily controlled by changing the digital input signal from the outside.
【００１１】[0011]
【実施例】本発明一実施例による三色発光表示装置は、
図１の如く、青色、緑色、赤色の三色の異なる発光色の
発光チップ１１，１２，１３を一組とした発光部１４
（ドット）が複数組設けられ、該各発光部１４の各発光
チップ１１，１２，１３に電流Ｉ０を供給する定電流回
路１５と、該定電流回路１５からいずれの発光部１４に
電流を供給すればよいかを選択する選択手段１６と、外
部からのデジタル入力信号に基づいて設定した基準電圧
Ｖｒｅｆを前記定電流回路１５に印加するＤ／Ａ変換器
１７とから構成されたものである。EXAMPLE A three-color light emitting display device according to an example of the present invention is
As shown in FIG. 1, a light emitting unit 14 including a set of light emitting chips 11, 12, and 13 of three different colors of blue, green, and red.
A plurality of sets of (dots) are provided, and a constant current circuit 15 for supplying a current I 0 to each light emitting chip 11, 12, 13 of each light emitting section 14, and a current from any one of the constant current circuits 15 to any light emitting section 14. It comprises a selection means 16 for selecting whether or not to supply, and a D / A converter 17 for applying a reference voltage Vref set based on a digital input signal from the outside to the constant current circuit 15. .
【００１２】前記各発光部１４は、図２の如く、例えば
４×４＝１６ドットの格子状に規則正しく配列されてい
る。一個のドット１４は、前記赤、緑、青三色の発光チ
ップ１１，１２，１３からなる。このうち、Ｘ方向に一
列に配された各発光部１４毎の各発光チップ１１，１
２，１３のカソード側は、同一の定電流回路１５に接続
されており、すなわち該定電流回路１５の電源ＶＬＥＤ
側で互いに並列に接続されている。As shown in FIG. 2, the light emitting portions 14 are regularly arranged in a lattice of 4 × 4 = 16 dots, for example. One dot 14 is composed of the red, green and blue light emitting chips 11, 12 and 13. Of these, the light emitting chips 11, 1 for each light emitting unit 14 arranged in a line in the X direction
The cathode sides of 2 and 13 are connected to the same constant current circuit 15, that is, the power source V LED of the constant current circuit 15.
Are connected in parallel with each other.
【００１３】各発光チップ１１，１２，１３の明るさ
（発光量）は、流れる順電流に比例するため、前記定電
流回路１５から供給される電流Ｉ０を変化させることに
よって明るさを変化させることができる。Since the brightness (amount of emitted light) of each of the light emitting chips 11, 12, 13 is proportional to the forward current that flows, the brightness is changed by changing the current I 0 supplied from the constant current circuit 15. be able to.
【００１４】また、各発光部１４同士の離間距離は、表
示が不自然とならないよう、Ｘ，Ｙ両方向について可及
的に小とされている。Further, the distance between the light emitting portions 14 is made as small as possible in both the X and Y directions so that the display is not unnatural.
【００１５】さらに、該各発光部１４内の三色の発光チ
ップ１１，１２，１３は、混合色が不自然とならないよ
う互いに可及的に近接されている。Further, the three color light emitting chips 11, 12, 13 in each light emitting section 14 are as close to each other as possible so that the mixed colors do not become unnatural.
【００１６】前記定電流回路１５は、例えばカレントミ
ラー回路が用いられ、複数のトランジスタ等を有する定
電流素子ＳＹ１Ｒ，ＳＹ１Ｇ，ＳＹ１Ｂ，ＳＹ２Ｒ，Ｓ
Ｙ２Ｇ，ＳＹ２Ｂ，…，ＳＹ４Ｒ，ＳＹ４Ｇ，ＳＹ４Ｂ
から構成される。該定電流回路１５の定電流素子ＳＹ１
Ｒ，ＳＹ１Ｇ，ＳＹ１Ｂ，ＳＹ２Ｒ，ＳＹ２Ｇ，ＳＹ２
Ｂ，…，ＳＹ４Ｒ，ＳＹ４Ｇ，ＳＹ４Ｂの個数は、各色
ごとにＹ方向のドット数だけ設定され、すなわちＹ軸上
の各点について一個づつ配され、Ｘ方向に一列に配され
た発光部１４の各発光チップ１１，１２，１３に並列に
接続される。As the constant current circuit 15, for example, a current mirror circuit is used, and constant current elements SY1 R , SY1 G , SY1 B , SY2 R , S having a plurality of transistors and the like are used.
Y2 G , SY2 B , ..., SY4 R , SY4 G , SY4 B
Composed of. Constant current element SY1 of the constant current circuit 15
R , SY1 G , SY1 B , SY2 R , SY2 G , SY2
The number of B , ..., SY4 R , SY4 G , and SY4 B is set by the number of dots in the Y direction for each color, that is, one for each point on the Y axis and arranged in a row in the X direction. The light emitting chips 11, 12, 13 of the unit 14 are connected in parallel.
【００１７】前記選択手段１６は、図１の如く、Ｘ方向
に一列に配された各発光部１４毎に駆動電流をオンオフ
切換えするＸ方向選択部２１と、Ｙ軸上の各点について
一個づつ配された定電流回路１５の各定電流素子ＳＹ１
Ｒ，ＳＹ１Ｇ，ＳＹ１Ｂ，ＳＹ２Ｒ，ＳＹ２Ｇ，ＳＹ２
Ｂ，…，ＳＹ４Ｒ，ＳＹ４Ｇ，ＳＹ４Ｂと前記Ｄ／Ａ変
換器１７の間に配されたＹ方向選択部２２とからなる。The selecting means 16 is, as shown in FIG. 1, an X-direction selecting portion 21 for switching on / off a drive current for each light emitting portion 14 arranged in a line in the X direction, and one for each point on the Y-axis. Each constant current element SY1 of the arranged constant current circuit 15
R , SY1 G , SY1 B , SY2 R , SY2 G , SY2
B, ..., consisting SY4 R, SY4 G, SY4 B and arranged a Y direction selection unit 22. During the D / A converter 17.
【００１８】前記Ｘ方向選択部２１は、各発光部１４の
発光チップ１１，１２，１３と電源ＶＬＥＤとの間に夫
々配されたトランジスタＴｒＸ１，ＴｒＸ２，…，Ｔｒ
Ｘ４と、該トランジスタＴｒＸ１，ＴｒＸ２，…，Ｔｒ
Ｘ４のベース電極への印加電圧をオンオフ切換えするＸ
方向セレクタ２３とからなる。The X-direction selecting section 21 includes transistors Tr X1 , Tr X2 , ..., Tr arranged between the light emitting chips 11, 12, 13 of each light emitting section 14 and the power source V LED.
X4 and the transistors Tr X1 , Tr X2 , ..., Tr
X for switching on / off the voltage applied to the base electrode of X4
And a direction selector 23.
【００１９】前記トランジスタＴｒＸ１，ＴｒＸ２，
…，ＴｒＸ４は、Ｘ軸上の各点について一個づつ配さ
れ、Ｘ方向に一列に配された発光部１４の各発光チップ
１１，１２，１３のアノード側に接続される。The transistors Tr X1 , Tr X2 ,
, Tr X4 are arranged one by one for each point on the X axis, and are connected to the anode side of each of the light emitting chips 11, 12, 13 of the light emitting section 14 arranged in a line in the X direction.
【００２０】前記Ｘ方向セレクタ２３は、マイクロコン
ピュータに組み込まれたプログラムに従って動作し、Ｙ
軸上の同一点において各発光チップ１１，１２，１３の
発光をＸ方向に発光部１４単位で時系列的に移動させ
る。The X-direction selector 23 operates according to a program installed in a microcomputer, and Y-direction selector 23
At the same point on the axis, the light emission of each of the light emitting chips 11, 12, 13 is moved in the X direction in units of the light emitting unit 14 in time series.
【００２１】前記Ｙ方向選択部２２は、各発光部１４の
発光チップ１１，１２，１３とＤ／Ａ変換器１７との間
に夫々配されたトランジスタＴｒＹ１Ｒ，ＴｒＹ１Ｇ，
ＴｒＹ１Ｂ，ＴｒＹ２Ｒ，ＴｒＹ２Ｇ，ＴｒＹ２Ｂ，
…，ＴｒＹ４Ｒ，ＴｒＹ４Ｇ，ＴｒＹ４Ｂと、該トラン
ジスタＴｒＹ１Ｒ，ＴｒＹ１Ｇ，ＴｒＹ１Ｂ，Ｔｒ
Ｙ２Ｒ，ＴｒＹ２Ｇ，ＴｒＹ２Ｂ，…，ＴｒＹ４Ｒ，Ｔ
ｒＹ４Ｇ，ＴｒＹ４Ｂのベース電極への印加電圧をオン
オフ切換えするＹ方向セレクタ２４とからなる。The Y-direction selecting section 22 includes transistors Tr Y1R , Tr Y1G , and Tr Y1R , Tr Y1G , which are respectively arranged between the light emitting chips 11, 12, 13 of each light emitting section 14 and the D / A converter 17.
Tr Y1B , Tr Y2R , Tr Y2G , Tr Y2B ,
..., Tr Y4R , Tr Y4G , Tr Y4B and the transistors Tr Y1R , Tr Y1G , Tr Y1B , Tr
Y2R , Tr Y2G , Tr Y2B , ..., Tr Y4R , T
r Y4G , Tr Y4B and a Y-direction selector 24 for switching on / off the voltage applied to the base electrode.
【００２２】前記トランジスタＴｒＹ１Ｒ，Ｔ
ｒＹ１Ｇ，ＴｒＹ１Ｂ，ＴｒＹ２Ｒ，ＴｒＹ２Ｇ，Ｔｒ
Ｙ２Ｂ，…，ＴｒＹ４Ｒ，ＴｒＹ４Ｇ，ＴｒＹ４Ｂは、
Ｙ軸上の各点について各色に対応して三個づつ配され、
Ｙ方向に一列に配された発光部１４の各発光チップ１
１，１２，１３に接続される。The transistors Tr Y1R and T
r Y1G , Tr Y1B , Tr Y2R , Tr Y2G , Tr
Y2B , ..., Tr Y4R , Tr Y4G , Tr Y4B are
Three points are arranged for each color on each point on the Y axis.
Each light emitting chip 1 of the light emitting section 14 arranged in a line in the Y direction
1, 12 and 13 are connected.
【００２３】前記Ｙ方向セレクタ２４は、マイクロコン
ピュータに組み込まれたプログラムに従って動作し、Ｘ
軸上の同一点において各発光チップ１１，１２，１３の
発光をＹ方向に発光部１４単位で時系列的に移動させ
る。The Y-direction selector 24 operates according to a program installed in a microcomputer,
At the same point on the axis, the light emission of each light emitting chip 11, 12, 13 is moved in the Y direction in units of the light emitting unit 14 in time series.
【００２４】前記Ｄ／Ａ変換器１７は、各色に夫々対応
した三個のＤ／Ａ変換部１７Ｒ，１７Ｇ，１７Ｂから構
成され、外部からの例えば３ビットの入力デジタル信号
をアナログ基準電圧Ｖｒｅｆに変換する。このうち、赤
色のＤ／Ａ変換部１７Ｒは、Ｙ方向セレクタ２４を介し
て赤色のトランジスタＴｒＹ１Ｒ，ＴｒＹ２Ｒ，…，Ｔ
ｒＹ４Ｒに接続され、緑色のＤ／Ａ変換部１７Ｇは、Ｙ
方向セレクタ２４を介して緑色のトランジスタＴｒ
Ｙ１Ｇ，ＴｒＹ２Ｇ，…，ＴｒＹ４Ｇに接続され、青色
のＤ／Ａ変換部１７Ｂは、Ｙ方向セレクタ２４を介して
青色のトランジスタＴｒＹ１Ｂ，ＴｒＹ２Ｂ，…，Ｔｒ
Ｙ４Ｂに接続されている。そして、該Ｄ／Ａ変換部１７
Ｒ，１７Ｇ，１７Ｂには、入力端子を通じて、前記各選
択部２１，２２の各セレクタ２３，２４の動作に同期さ
れたデジタル入力信号（ＤｔＲ，ＤｔＧ，ＤｔＢ）が入
力される。The D / A converter 17 is composed of three D / A converters 17 R , 17 G and 17 B corresponding to the respective colors, and an external digital input signal of, for example, 3 bits is used as an analog reference. Convert to voltage Vref. Of these, the red D / A conversion unit 17 R includes red transistors Tr Y1R , Tr Y2R , ..., T via the Y-direction selector 24.
r Y4R , and the green D / A converter 17 G is connected to Y
Green transistor Tr via direction selector 24
, Tr Y4G connected to Y1G , Tr Y2G , ..., Tr Y4G , and the blue D / A conversion unit 17 B receives the blue transistors Tr Y1B , Tr Y2B , ..., Tr via the Y-direction selector 24.
It is connected to Y4B . Then, the D / A converter 17
Digital input signals (Dt R , Dt G , Dt B ) synchronized with the operations of the selectors 23, 24 of the selection units 21, 22 are input to R 1 , 17 G , 17 B through input terminals. .
【００２５】そして、前記定電流回路１５およびＤ／Ａ
変換器１７は、図３の如く、単一の集積回路に集積され
ている。Then, the constant current circuit 15 and the D / A
The converter 17 is integrated in a single integrated circuit as shown in FIG.
【００２６】上記構成において、図４に示したＴ１中の
ｔ１のタイミングで、選択手段１６のＸ方向選択部２１
は図２中のＸ１を選択し、また、Ｙ方向選択部２２は、
図２中のＹ１を選択発光する。すなわち、（Ｘ１，Ｙ
１）のドットを選択する。In the above structure, the X-direction selecting section 21 of the selecting means 16 is at the timing of t 1 in T 1 shown in FIG.
2 selects X1 in FIG. 2, and the Y-direction selector 22
Y1 in FIG. 2 is selectively emitted. That is, (X1, Y
Select the dot in 1).
【００２７】これと同期して、図５の如く、外部から、
各Ｄ／Ａ変換部１７Ｒ，１７Ｇ，１７Ｂに、デジタル入
力信号（ＤｔＲ，ＤｔＧ，ＤｔＢ）を入力する。In synchronization with this, as shown in FIG.
A digital input signal (Dt R , Dt G , Dt B ) is input to each of the D / A converters 17 R , 17 G , and 17 B.
【００２８】ここで、デジタル入力信号（ＤｔＲ，Ｄｔ
Ｇ，ＤｔＢ）が（１１１，１１１，１１１）のとき、図
５の如く、Ｄ／Ａ変換部１７Ｒ，１７Ｇ，１７ＢにてＤ
／Ａ変換を行い、基準電圧Ｖｒｅｆをハイレベルとす
る。そうすると、定電流回路１５の定電流素子ＳＹ
１Ｒ，ＳＹ１Ｇ，ＳＹ１Ｂから全発光チップ１１，１
２，１３に供給される電流Ｉ０は最大となり、図２中の
（Ｘ１，Ｙ１）のドットは、図６の如く、全ての色が混
ざりしかも最も明度が高くなることになり、白色とな
る。Here, the digital input signals (Dt R , Dt
G , Dt B ) is (111, 111, 111), the D / A converters 17 R , 17 G , and 17 B are D
/ A conversion is performed and the reference voltage Vref is set to a high level. Then, the constant current element SY of the constant current circuit 15
1 R , SY1 G , SY1 B to all light emitting chips 11, 1
The current I 0 supplied to Nos. 2 and 13 is the maximum, and the dots (X1, Y1) in FIG. 2 have all colors mixed and have the highest brightness, as shown in FIG. 6, and become white. .
【００２９】さらに、図４中のｔ２〜ｔ１６のタイミン
グでデジタル入力信号を（１１１，１１１，１１１）と
すると、図２に示した表示板の全ドット（Ｘ１，Ｙ１）
〜（Ｘ４，Ｙ４）は白色となる。Further, assuming that the digital input signal is (111, 111, 111) at the timing of t 2 to t 16 in FIG. 4, all dots (X1, Y1) of the display plate shown in FIG.
(X4, Y4) are white.
【００３０】このタイミングｔ１〜ｔ１６において、デ
ジタル入力信号（ＤｔＲ，ＤｔＧ，ＤｔＢ）を図７のよ
うに変化させることにより、フルカラーによる文字・図
形等の表示が可能となる。By changing the digital input signals (Dt R , Dt G , Dt B ) at the timings t 1 to t 16 as shown in FIG. 7, it is possible to display characters and figures in full color.
【００３１】例えば、図５において、各Ｄ／Ａ変換部１
７Ｒ，１７Ｇ，１７Ｂへのデジタル入力信号が全て０レ
ベルの場合、基準電圧Ｖｒｅｆは０Ｖで、定電流回路１
５から発光チップ１１，１２，１３に供給される電流Ｉ
０は０レベルとなる。For example, in FIG. 5, each D / A converter 1
When all the digital input signals to 7 R , 17 G , and 17 B are 0 level, the reference voltage Vref is 0 V and the constant current circuit 1
5, the current I supplied to the light emitting chips 11, 12, and 13
0 becomes 0 level.
【００３２】また、デジタル入力信号のいずれかの信号
要素ＤｔＲ，ＤｔＧ，ＤｔＢが００１となると、これに
対応する定電流素子ＳＹ１Ｒ，ＳＹ１Ｇ，ＳＹ１Ｂ，Ｓ
Ｙ２Ｒ，ＳＹ２Ｇ，ＳＹ２Ｂ，…，ＳＹ４Ｒ，ＳＹ
４Ｇ，ＳＹ４Ｂへの基準電圧Ｖｒｅｆが一定レベルだけ
発生し、一定レベルの電流Ｉ０が発光チップ１１，１
２，１３に供給される。When any one of the signal elements Dt R , Dt G , Dt B of the digital input signal becomes 001, the constant current elements SY1 R , SY1 G , SY1 B , S corresponding to the signal elements Dt R , Dt G , Dt B become 001.
Y2 R , SY2 G , SY2 B , ..., SY4 R , SY
The reference voltage Vref to the 4 G and SY4 B is generated at a constant level, and the constant level current I 0 is applied to the light emitting chips 11 and 1.
2 and 13 are supplied.
【００３３】デジタル入力信号のいずれかの信号要素Ｄ
ｔＲ，ＤｔＧ，ＤｔＢが０１０となると、００１の時に
比べ、基準電圧Ｖｒｅｆが２倍に大きくなり、電流Ｉ０
も大きくなる結果、これに対応する発光チップ１１，１
２，１３はその分明るく点灯する。Any signal element D of the digital input signal
When t R , Dt G , and Dt B become 010, the reference voltage Vref becomes twice as large as when 001, and the current I 0
As a result, the corresponding light emitting chips 11 and 1
2 and 13 light up accordingly.
【００３４】以上のように、定電流回路１５へ３ビット
信号を入力する場合、８階調の明るさとなり、三色で
は、８３＝５１２種類の異なった色が作成可能となる。
したがって、図４に示したＴ１の時間内で、（Ｘ１，Ｙ
１）から（Ｘ４，Ｙ４）の各ドットを、５１２種類の異
なった色相・明るさで発光させることができる。As described above, when a 3-bit signal is input to the constant current circuit 15, the brightness becomes 8 gradations, and with 3 colors, 8 3 = 512 different colors can be created.
Therefore, within the time T 1 shown in FIG. 4, (X1, Y
Each of dots 1) to (X4, Y4) can emit 512 kinds of different hues and brightness.
【００３５】この場合、従来複雑であった駆動回路を省
略でき、外部にデジタル入力信号を出力する回路を設け
るだけで済むので、表示装置を簡素化できる。In this case, it is possible to omit a conventionally complicated drive circuit and to provide a circuit for outputting a digital input signal to the outside, so that the display device can be simplified.
【００３６】なお、本発明は、上記実施例に限定される
ものではなく、本発明の範囲内で上記実施例に多くの修
正および変更を加え得ることは勿論である。The present invention is not limited to the above embodiment, and it goes without saying that many modifications and changes can be made to the above embodiment within the scope of the present invention.
【００３７】例えば、上記実施例では、デジタル入力信
号のビット数を三桁としていたが、ビット数を増やすこ
とにより微妙な明るさ調整を可能としてもよい。For example, in the above embodiment, the number of bits of the digital input signal is three digits, but the brightness may be finely adjusted by increasing the number of bits.
【００３８】また、上記実施例では、表示画面を４×４
の１６ドットとしていたが、これより多くのドット数を
設定してもよい。In the above embodiment, the display screen is 4 × 4.
However, a larger number of dots may be set.
【００３９】さらに、上記実施例では、選択手段１６の
Ｘ方向セレクタ２３およびＹ方向セレクタ２４は、所定
のプログラムにて定常的に時系列動作するよう構成され
ていたが、外部からの入力信号に基づいてドットをＸ方
向およびＹ方向に選択してもよい。この場合の外部から
の入力信号は、作業者のボタン入力操作のように手動式
であってもよいし、あるいは外部装置からの自動入力で
あってもよい。Further, in the above embodiment, the X-direction selector 23 and the Y-direction selector 24 of the selecting means 16 are constructed so as to constantly operate in a time series by a predetermined program, but in response to an input signal from the outside. Based on this, the dots may be selected in the X direction and the Y direction. The input signal from the outside in this case may be a manual type such as a button input operation by an operator, or may be an automatic input from an external device.
【００４０】[0040]
【発明の効果】以上の説明から明らかな通り、本発明に
よると、青色、緑色、赤色の三色の異なる発光色の発光
チップを一組とした発光部を複数組設け、各発光部の各
発光チップに電流を供給する定電流回路と、外部からの
デジタル入力信号に基づいて設定した基準電圧を定電流
回路に印加するデジタル／アナログ変換器とを設けてい
るので、従来のように複雑な制御回路を必要とせずに、
Ｄ／Ａ変換器のデジタル入力信号を制御することによっ
て極めて簡単に明るさ色調を変化させることができる。As is apparent from the above description, according to the present invention, a plurality of sets of light emitting parts each including a set of light emitting chips of different emission colors of blue, green and red are provided, and each of the light emitting parts is provided. Since a constant current circuit for supplying a current to the light emitting chip and a digital / analog converter for applying a reference voltage set based on a digital input signal from the outside to the constant current circuit are provided, a complicated structure as in the conventional case is provided. Without the need for a control circuit,
By controlling the digital input signal of the D / A converter, the brightness color tone can be changed very easily.
【００４１】また、取り扱い容易なデジタル入力信号で
制御可能なため、コンピュータやプログラマブルコント
ローラ等の機器との接続も簡単にできる。Further, since it can be controlled by a digital input signal which is easy to handle, it can be easily connected to a device such as a computer or a programmable controller.
【００４２】また、定電流回路およびデジタル／アナロ
グ変換器を単一の集積回路に集積されているので、表示
装置を小型化できるといった優れた効果がある。Further, since the constant current circuit and the digital / analog converter are integrated in a single integrated circuit, there is an excellent effect that the display device can be downsized.
【図１】本発明一実施例の三色発光表示装置の回路ブロ
ック図FIG. 1 is a circuit block diagram of a three-color light emitting display device according to an embodiment of the present invention.
【図２】三色発光表示装置の表示画面の座標系を示す図FIG. 2 is a diagram showing a coordinate system of a display screen of a three-color light emitting display device.
【図３】定電流回路およびデジタル／アナログ変換器が
単一の集積回路に集積されたことを示す概略図FIG. 3 is a schematic diagram showing that the constant current circuit and the digital / analog converter are integrated in a single integrated circuit.
【図４】三色発光表示装置の駆動タイミングチャートFIG. 4 is a drive timing chart of a three-color light emitting display device.
【図５】三色発光表示装置の概略図FIG. 5 is a schematic diagram of a three-color light emitting display device.
【図６】光の三原色と混合色の説明図FIG. 6 is an explanatory diagram of three primary colors of light and mixed colors.
【図７】デジタル入力信号と混合色との関係を示す説明
図FIG. 7 is an explanatory diagram showing a relationship between a digital input signal and a mixed color.
【図８】従来の三色発光表示装置の回路ブロック図FIG. 8 is a circuit block diagram of a conventional three-color light emitting display device.
【図９】従来の三色発光表示装置の外観図FIG. 9 is an external view of a conventional three-color light emitting display device.
【図１０】従来の三色発光表示装置の内部回路図FIG. 10 is an internal circuit diagram of a conventional three-color light emitting display device.
１１，１２，１３ 発光チップ １４ 発光部 １５ 定電流回路 １７ デジタル／アナログ変換器 Ｖｒｅｆ 基準電圧 11, 12, 13 Light emitting chip 14 Light emitting unit 15 Constant current circuit 17 Digital / analog converter Vref Reference voltage
Claims (2)
の発光チップを一組とした発光部が複数組設けられ、該
各発光部の各発光チップに電流を供給する定電流回路
と、該定電流回路からいずれの発光部に電流を供給すれ
ばよいかを選択する選択手段と、外部からのデジタル入
力信号に基づいて設定した基準電圧を前記定電流回路に
印加するデジタル／アナログ変換器とが設けられたこと
を特徴とする三色発光表示装置。1. A constant current circuit, which is provided with a plurality of sets of light emitting units each including a set of light emitting chips of different emission colors of blue, green and red, and which supplies a current to each light emitting chip of each light emitting unit. Selection means for selecting which light-emitting portion should be supplied with current from the constant current circuit, and digital / analog conversion for applying a reference voltage set based on a digital input signal from the outside to the constant current circuit A three-color light emitting display device characterized in that a display device is provided.
ル／アナログ変換器は、単一の集積回路に集積されたこ
とを特徴とする三色発光表示装置。2. A three-color light emitting display device, wherein the constant current circuit and the digital / analog converter according to claim 1 are integrated in a single integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP191993A JP3098641B2 (en) | 1993-01-08 | 1993-01-08 | Three color light emitting display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP191993A JP3098641B2 (en) | 1993-01-08 | 1993-01-08 | Three color light emitting display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06208335A true JPH06208335A (en) | 1994-07-26 |
| JP3098641B2 JP3098641B2 (en) | 2000-10-16 |
Family
ID=11515003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP191993A Expired - Fee Related JP3098641B2 (en) | 1993-01-08 | 1993-01-08 | Three color light emitting display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3098641B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002244619A (en) * | 2001-02-15 | 2002-08-30 | Sony Corp | Circuit for driving led display device |
| JP2003140614A (en) * | 2001-11-08 | 2003-05-16 | Nec Corp | Data line driving circuit |
| JP2006529058A (en) * | 2003-05-28 | 2006-12-28 | ソウル セミコンダクター シーオー エルティディ | Light emitting diode package and light emitting diode system having at least two heat sinks |
| US7385574B1 (en) | 1995-12-29 | 2008-06-10 | Cree, Inc. | True color flat panel display module |
| JP2009069370A (en) * | 2007-09-12 | 2009-04-02 | Futaba Corp | Driving circuit for display panel, and display device |
| US8159148B2 (en) | 2006-01-17 | 2012-04-17 | Chimei Innolux Corporation | Light emitting diode light source module |
| US8624801B2 (en) | 2006-01-19 | 2014-01-07 | Chimei Innolux Corporation | Pixel structure having a transistor gate voltage set by a reference voltage |
| JP2016504619A (en) * | 2012-11-29 | 2016-02-12 | リヤード オプトエレクトロニック カンパニー リミテッドＬｅｙａｒｄ Ｏｐｔｏｅｌｅｃｔｒｏｎｉｃ Ｃｏ．， Ｌｔｄ． | LED display and LED control system |
| CN110718184A (en) * | 2019-09-20 | 2020-01-21 | 无锡力芯微电子股份有限公司 | LED display system and driving circuit of array type LED display panel thereof |
| EP3549124B1 (en) * | 2016-12-01 | 2023-07-12 | LRX Investissement | Addressing mode and principle of construction of matrix screens for displaying colour images with quasi-static behaviour |
-
1993
- 1993-01-08 JP JP191993A patent/JP3098641B2/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8766885B2 (en) | 1995-12-29 | 2014-07-01 | Cree, Inc. | True color flat panel display module |
| US7385574B1 (en) | 1995-12-29 | 2008-06-10 | Cree, Inc. | True color flat panel display module |
| JP2002244619A (en) * | 2001-02-15 | 2002-08-30 | Sony Corp | Circuit for driving led display device |
| JP2003140614A (en) * | 2001-11-08 | 2003-05-16 | Nec Corp | Data line driving circuit |
| US8823036B2 (en) | 2003-05-28 | 2014-09-02 | Seoul Semiconductor Co., Ltd. | Light emitting diode package and light emitting diode system having at least two heat sinks |
| US7994526B2 (en) | 2003-05-28 | 2011-08-09 | Seoul Semiconductor Co., Ltd. | Light emitting diode package and light emitting diode system having at least two heat sinks |
| JP2006529058A (en) * | 2003-05-28 | 2006-12-28 | ソウル セミコンダクター シーオー エルティディ | Light emitting diode package and light emitting diode system having at least two heat sinks |
| US8159148B2 (en) | 2006-01-17 | 2012-04-17 | Chimei Innolux Corporation | Light emitting diode light source module |
| US8624801B2 (en) | 2006-01-19 | 2014-01-07 | Chimei Innolux Corporation | Pixel structure having a transistor gate voltage set by a reference voltage |
| JP2009069370A (en) * | 2007-09-12 | 2009-04-02 | Futaba Corp | Driving circuit for display panel, and display device |
| JP2016504619A (en) * | 2012-11-29 | 2016-02-12 | リヤード オプトエレクトロニック カンパニー リミテッドＬｅｙａｒｄ Ｏｐｔｏｅｌｅｃｔｒｏｎｉｃ Ｃｏ．， Ｌｔｄ． | LED display and LED control system |
| EP3549124B1 (en) * | 2016-12-01 | 2023-07-12 | LRX Investissement | Addressing mode and principle of construction of matrix screens for displaying colour images with quasi-static behaviour |
| CN110718184A (en) * | 2019-09-20 | 2020-01-21 | 无锡力芯微电子股份有限公司 | LED display system and driving circuit of array type LED display panel thereof |
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|---|---|
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