JP2002237619A - Method for controlling luminescent color of light- emitting diode - Google Patents
Method for controlling luminescent color of light- emitting diodeInfo
- Publication number
- JP2002237619A JP2002237619A JP2001034750A JP2001034750A JP2002237619A JP 2002237619 A JP2002237619 A JP 2002237619A JP 2001034750 A JP2001034750 A JP 2001034750A JP 2001034750 A JP2001034750 A JP 2001034750A JP 2002237619 A JP2002237619 A JP 2002237619A
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting diode
- pulse
- color
- light emitting
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、発光ダイオードの
発光色制御方法に係り、適当なパルス電流を流して同一
点から複数の波長の光を放射させ、それらを混ぜ合わせ
ることにより発光色を制御するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the color of light emitted from a light emitting diode. The present invention relates to a method for controlling a color of emitted light by emitting a plurality of wavelengths from the same point by applying an appropriate pulse current. Is what you do.
【０００２】[0002]
【従来の技術】発光ダイオード（ＬＥＤ）は通常、使用
する半導体材料や構造で発光の色相が決まっている。フ
ルカラーＬＥＤと呼ばれるものは、青、緑、赤のＬＥＤ
チップを一つのパッケージに実装し、各々のチップに流
す電流を調整していろいろな色相の発光を得るものであ
る。2. Description of the Related Art Generally, the color of light emitted from a light emitting diode (LED) is determined by the semiconductor material and structure used. What are called full-color LEDs are blue, green, and red LEDs
The chips are mounted on a single package, and the current flowing through each chip is adjusted to obtain light of various hues.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
た従来のフルカラー発光ダイオードは、青、緑、赤のＬ
ＥＤチップを一つのパッケージに実装しているために、 （１）各色の光が異なる点から放出されており、近くで
見ると色が分離して見える。However, the above-mentioned conventional full-color light-emitting diodes have blue, green, and red LEDs.
Since the ED chip is mounted in one package, (1) light of each color is emitted from a different point, and the colors appear to be separated when viewed close.
【０００４】（２）小型化が難しい。等の問題点があっ
た。(2) It is difficult to reduce the size. And so on.
【０００５】本発明は、上記問題点を除去し、発光源が
１箇所で、小型化を図ることができるとともに、容易に
発光色を制御することができる発光ダイオードの発光色
制御方法を提供することを目的とする。The present invention provides a method for controlling the color of a light-emitting diode, which eliminates the above-mentioned problems, can reduce the size of the light-emitting source in one place, and can easily control the color of the light-emitting diode. The purpose is to.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記目的を達
成するために、 （１）発光ダイオードの発光色制御方法において、電流
値を変えることによって発光波長が変わる発光ダイオー
ドに複数のピーク電流値をもつパルス電流を流すことに
より、発光色を制御することを特徴とする。In order to achieve the above object, the present invention provides: (1) a method for controlling the color of light emitted from a light emitting diode, the method comprising: The emission color is controlled by passing a pulse current having a value.
【０００７】（２）上記（１）記載の発光ダイオードの
発光色制御方法において、前記発光ダイオードがＧａＮ
系発光ダイオードであることを特徴とする。(2) In the method for controlling a light emitting color of a light emitting diode according to the above (1), the light emitting diode may be GaN.
A light-emitting diode.
【０００８】（３）上記（１）記載の発光ダイオードの
発光色制御方法において、前記各パルス電流に時間差を
与えることにより、色を混ぜ合わせることを特徴とす
る。(3) The method for controlling the color of light emitted from a light emitting diode according to the above (1), wherein the colors are mixed by giving a time difference to each of the pulse currents.
【０００９】（４）上記（１）記載の発光ダイオードの
発光色制御方法において、前記各パルス電流に対応する
光の発光波長をピーク電流値で、発光強度をパルス電流
のパルス幅及びパルス数で制御することを特徴とする。(4) In the light emitting color control method for a light emitting diode according to the above (1), the light emission wavelength of light corresponding to each of the pulse currents is represented by a peak current value, and the light emission intensity is represented by a pulse width and a pulse number of the pulse current. It is characterized by controlling.
【００１０】[0010]
【発明の実施の形態】以下、本発明の実施の形態につい
て詳細に説明する。Embodiments of the present invention will be described below in detail.
【００１１】図１は本発明の実施例を示すＧａＮ系発光
ダイオードに印加するパルス波形図である。FIG. 1 is a pulse waveform diagram applied to a GaN-based light emitting diode according to an embodiment of the present invention.
【００１２】この図において、縦軸は電流（ｍＡ）、横
軸は時間（μｓ）を示しており、１は第１のパルス、２
は第２のパルス、Ｔａは第１のパルス１の幅、Ｔｂは第
２のパルス２の幅、Ｔは第１及び第２のパルス１，２の
周期、Ｉａは第１のパルス１の電流値、Ｉｂは第２のパ
ルス２の電流値である。ここで、第１及び第２のパルス
１，２の周期Ｔは３２０μｓ、第１のパルス１の電流値
Ｉａは３５０ｍＡ、第２のパルス２の電流値Ｉｂは６ｍ
Ａである。In this figure, the vertical axis represents current (mA) and the horizontal axis represents time (μs), where 1 is the first pulse, 2
Is the width of the second pulse, Ta is the width of the first pulse 1, Tb is the width of the second pulse 2, T is the period of the first and second pulses 1 and 2, and Ia is the current of the first pulse 1. The value Ib is the current value of the second pulse 2. Here, the period T of the first and second pulses 1 and 2 is 320 μs, the current value Ia of the first pulse 1 is 350 mA, and the current value Ib of the second pulse 2 is 6 m
A.
【００１３】図２は本発明の実施例を示すＧａＮ系発光
ダイオードの発光色制御の様子を説明するための写真を
示す図である。すなわち、図２（ａ）ではパルス電流の
波形はＴａ＝１０μｓ，Ｔｂ＝０μｓであり、青１００
％となり、図２（ｂ）ではパルス電流の波形はＴａ＝１
０μｓ，Ｔｂ＝５０μｓであり、青８５％，緑１５％と
なり、図２（ｃ）ではパルス電流の波形はＴａ＝１０μ
ｓ，Ｔｂ＝１００μｓであり、青７５％，緑２５％とな
り、図２（ｄ）ではパルス電流の波形はＴａ＝１０μ
ｓ，Ｔｂ＝１５０μｓであり、青６５％，緑３５％とな
り、図２（ｅ）ではパルス電流の波形はＴａ＝１０μ
ｓ，Ｔｂ＝２００μｓであり、青６０％，緑４０％とな
り、図２（ｆ）ではパルス電流の波形はＴａ＝１０μ
ｓ，Ｔｂ＝２５０μｓであり、青５５％，緑４５％とな
り、図２（ｇ）ではパルス電流の波形はＴａ＝１０μ
ｓ，Ｔｂ＝２８０μｓであり、青５０％，緑５０％とな
り、図２（ｈ）ではパルス電流の波形はＴａ＝０μｓ，
Ｔｂ＝２８０μｓであり、緑１００％となることが確認
できた。つまり、青色から緑色へと発光色を制御するこ
とができる。FIG. 2 is a view showing a photograph for explaining the state of emission color control of the GaN-based light emitting diode according to the embodiment of the present invention. That is, in FIG. 2A, the waveform of the pulse current is Ta = 10 μs, Tb = 0 μs,
%, And the waveform of the pulse current in FIG.
0 μs, Tb = 50 μs, 85% blue and 15% green, and the waveform of the pulse current in FIG.
s, Tb = 100 μs, 75% blue and 25% green, and the waveform of the pulse current in FIG.
s, Tb = 150 μs, 65% blue and 35% green, and the waveform of the pulse current in FIG.
s, Tb = 200 μs, 60% blue and 40% green, and the waveform of the pulse current in FIG.
s, Tb = 250 μs, 55% blue and 45% green, and the waveform of the pulse current in FIG.
s, Tb = 280 μs, 50% blue and 50% green. In FIG. 2H, the waveform of the pulse current is Ta = 0 μs,
Tb was 280 μs, and it was confirmed that green was 100%. That is, the emission color can be controlled from blue to green.
【００１４】このように、本発明は電流の大きさにより
発光の波長が異なるＬＥＤを用い、時間差を付けたパル
ス電流でＬＥＤを駆動することにより多色化を実現する
ことができる。各パルス電流に対応する光の発光波長は
ピーク電流値で、発光強度はパルス幅及びパルス数で調
整する。現在、この方法で多色化できるものはＧａＮ系
ＬＥＤであり、紫から橙までの多色を実現している。As described above, according to the present invention, it is possible to realize multi-color display by using LEDs having different emission wavelengths according to the magnitude of the current and driving the LEDs with a pulse current having a time difference. The emission wavelength of the light corresponding to each pulse current is adjusted by the peak current value, and the emission intensity is adjusted by the pulse width and the number of pulses. At present, GaN-based LEDs can be multicolored by this method, and realize multicolors from purple to orange.
【００１５】上記のことから以下のことが言える。The following can be said from the above.
【００１６】（１）電流値を変えることによって発光波
長が変わる発光ダイオード（例えばＧａＮ系発光ダイオ
ード）に対して、適当なピーク電流値をもつパルス電流
を流すことにより、発光波長を制御することができる。(1) It is possible to control the emission wavelength by passing a pulse current having an appropriate peak current value to a light-emitting diode (for example, a GaN-based light-emitting diode) whose emission wavelength changes by changing the current value. it can.
【００１７】（２）各発光波長に対応するパルス電流に
時間差を与えることにより、発光色を混ぜ合わせること
ができる。(2) Emission colors can be mixed by giving a time difference to the pulse current corresponding to each emission wavelength.
【００１８】（３）各波長の光の発光強度をパルス電流
のパルス幅及びパルス数で制御することができる。(3) The emission intensity of light of each wavelength can be controlled by the pulse width and pulse number of the pulse current.
【００１９】なお、本発明は上記実施例に限定されるも
のではなく、本発明の趣旨に基づいて種々の変形が可能
であり、これらを本発明の範囲から排除するものではな
い。It should be noted that the present invention is not limited to the above embodiment, but various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
【００２０】[0020]
【発明の効果】以上、詳細に説明したように、本発明に
よると、発光源は１箇所であるため、小型化を図ること
ができるとともに、容易に発光色を制御することができ
る。すなわち、一枚のチップで容易に複数の色を作るこ
とができ、素子の小型化に有効である。As described in detail above, according to the present invention, since there is only one light emitting source, the size can be reduced and the color of emitted light can be easily controlled. That is, a plurality of colors can be easily produced with one chip, which is effective for downsizing the element.
【００２１】また、複数の波長の光が同一点から放射さ
れるので、近くで見ても色が分離して見えることがな
い。超小型フルカラー発光ダイオード、およびそれを用
いた高精細フルカラーディスプレイ、電光掲示板等への
応用が期待される。Further, since light of a plurality of wavelengths is emitted from the same point, the colors do not appear to be separated even when viewed from close. It is expected to be applied to ultra-compact full-color light-emitting diodes, high-definition full-color displays using the same, and electric bulletin boards.
【００２２】現在では紫〜橙の多色をＧａＮ系ＬＥＤで
実現しているが、多準位発光のＬＥＤが実現されてくる
と大変有効な駆動技術として注目されるであろう。At present, violet-orange multi-colors are realized by GaN-based LEDs, but if multi-level light-emitting LEDs are realized, they will attract attention as a very effective driving technique.
【図１】本発明の実施例を示すＧａＮ系発光ダイオード
に印加するパルス波形図である。FIG. 1 is a pulse waveform diagram applied to a GaN-based light emitting diode according to an embodiment of the present invention.
【図２】本発明の実施例を示すＧａＮ系発光ダイオード
の発光色制御の様子を説明するための写真を示す図であ
る。FIG. 2 is a view showing a photograph for explaining a state of emission color control of a GaN-based light emitting diode according to an embodiment of the present invention.
１ 第１のパルス ２ 第２のパルス 1 First pulse 2 Second pulse
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5C080 AA07 CC03 DD22 EE30 FF07 JJ04 JJ05 5F041 AA12 AA14 AA47 BB33 CA40 FF01 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C080 AA07 CC03 DD22 EE30 FF07 JJ04 JJ05 5F041 AA12 AA14 AA47 BB33 CA40 FF01
Claims (4)
変わる発光ダイオードに複数のピーク電流値をもつパル
ス電流を流すことにより、発光色を制御することを特徴
とする発光ダイオードの発光色制御方法。1. A method for controlling a light emitting color of a light emitting diode, comprising controlling a light emitting color by supplying a pulse current having a plurality of peak current values to a light emitting diode whose light emitting wavelength changes by changing a current value.
制御方法において、前記発光ダイオードがＧａＮ系発光
ダイオードであることを特徴とする発光ダイオードの発
光色制御方法。2. The method according to claim 1, wherein the light-emitting diode is a GaN-based light-emitting diode.
制御方法において、前記各パルス電流に時間差を与える
ことにより、色を混ぜ合わせることを特徴とする発光ダ
イオードの発光色制御方法。3. The light emitting diode color control method according to claim 1, wherein colors are mixed by giving a time difference to each pulse current.
制御方法において、前記各パルス電流に対応する光の発
光波長をピーク電流値で、発光強度をパルス幅及びパル
ス数で制御することを特徴とする発光ダイオードの発光
色制御方法。4. The method according to claim 1, wherein the emission wavelength of light corresponding to each pulse current is controlled by a peak current value, and the emission intensity is controlled by a pulse width and the number of pulses. A method for controlling the color of light emitted from a light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001034750A JP4027609B2 (en) | 2001-02-13 | 2001-02-13 | Method for controlling emission color of light emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001034750A JP4027609B2 (en) | 2001-02-13 | 2001-02-13 | Method for controlling emission color of light emitting diode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002237619A true JP2002237619A (en) | 2002-08-23 |
| JP4027609B2 JP4027609B2 (en) | 2007-12-26 |
Family
ID=18898300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001034750A Expired - Fee Related JP4027609B2 (en) | 2001-02-13 | 2001-02-13 | Method for controlling emission color of light emitting diode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4027609B2 (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005275204A (en) * | 2004-03-26 | 2005-10-06 | Nec Display Solutions Ltd | Liquid crystal display device |
| WO2007032281A1 (en) | 2005-09-13 | 2007-03-22 | Sony Corporation | GaN-BASE SEMICONDUCTOR LIGHT EMITTING ELEMENT, LUMINESCENT DEVICE, IMAGE DISPLAY DEVICE, PLANAR LIGHT SOURCE DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE ASSEMBLY |
| JP2007080998A (en) * | 2005-09-13 | 2007-03-29 | Sony Corp | Image display device, planar light source device and liquid crystal display device assembly |
| JP2007101802A (en) * | 2005-10-03 | 2007-04-19 | Seiko Instruments Inc | Field sequential color display device |
| JP2008134402A (en) * | 2006-11-28 | 2008-06-12 | Seiko Epson Corp | Image display device, projector and image display method |
| JP2009056248A (en) * | 2007-09-03 | 2009-03-19 | Fujifilm Corp | Light source unit, drive control method of light source unit and endoscope |
| US7573446B2 (en) | 2004-01-30 | 2009-08-11 | Sharp Kabushiki Kaisha | Method and device for driving LED element, illumination apparatus, and display apparatus |
| JP2011022481A (en) * | 2009-07-17 | 2011-02-03 | Panasonic Corp | Liquid crystal display apparatus |
| US7948454B2 (en) | 2006-08-11 | 2011-05-24 | Sony Corporation | Method for driving light-emitting diode, light-emitting diode, method for driving display, display, method for driving electronic device, electronic device, method for driving optical communication apparatus, and optical communication apparatus |
| JP2012095911A (en) * | 2010-11-04 | 2012-05-24 | Fujifilm Corp | Endoscope and light source device for endoscope |
| JP2014510296A (en) * | 2011-01-31 | 2014-04-24 | グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー | Multi-level drive chromaticity shift compensation for electroluminescent devices |
| JP2017009494A (en) * | 2015-06-24 | 2017-01-12 | 富士通株式会社 | Color measuring device |
| CN107481664A (en) * | 2017-09-28 | 2017-12-15 | 京东方科技集团股份有限公司 | Display panel and its driving method, display device |
| CN116524852A (en) * | 2023-07-05 | 2023-08-01 | 禹创半导体(深圳)有限公司 | LED display panel and pixel color display method and device thereof |
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2001
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|---|---|---|---|---|
| US7573446B2 (en) | 2004-01-30 | 2009-08-11 | Sharp Kabushiki Kaisha | Method and device for driving LED element, illumination apparatus, and display apparatus |
| JP4593140B2 (en) * | 2004-03-26 | 2010-12-08 | Ｎｅｃディスプレイソリューションズ株式会社 | Liquid crystal display |
| JP2005275204A (en) * | 2004-03-26 | 2005-10-06 | Nec Display Solutions Ltd | Liquid crystal display device |
| WO2007032281A1 (en) | 2005-09-13 | 2007-03-22 | Sony Corporation | GaN-BASE SEMICONDUCTOR LIGHT EMITTING ELEMENT, LUMINESCENT DEVICE, IMAGE DISPLAY DEVICE, PLANAR LIGHT SOURCE DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE ASSEMBLY |
| JP2007080998A (en) * | 2005-09-13 | 2007-03-29 | Sony Corp | Image display device, planar light source device and liquid crystal display device assembly |
| US8168966B2 (en) | 2005-09-13 | 2012-05-01 | Sony Corporation | GaN-based semiconductor light-emitting device, light illuminator, image display planar light source device, and liquid crystal display assembly |
| JP2007101802A (en) * | 2005-10-03 | 2007-04-19 | Seiko Instruments Inc | Field sequential color display device |
| EP3703470A1 (en) | 2006-08-11 | 2020-09-02 | Sony Corporation | Display apparatus |
| US7948454B2 (en) | 2006-08-11 | 2011-05-24 | Sony Corporation | Method for driving light-emitting diode, light-emitting diode, method for driving display, display, method for driving electronic device, electronic device, method for driving optical communication apparatus, and optical communication apparatus |
| JP2008134402A (en) * | 2006-11-28 | 2008-06-12 | Seiko Epson Corp | Image display device, projector and image display method |
| JP2009056248A (en) * | 2007-09-03 | 2009-03-19 | Fujifilm Corp | Light source unit, drive control method of light source unit and endoscope |
| JP2011022481A (en) * | 2009-07-17 | 2011-02-03 | Panasonic Corp | Liquid crystal display apparatus |
| JP2012095911A (en) * | 2010-11-04 | 2012-05-24 | Fujifilm Corp | Endoscope and light source device for endoscope |
| JP2014510296A (en) * | 2011-01-31 | 2014-04-24 | グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー | Multi-level drive chromaticity shift compensation for electroluminescent devices |
| JP2017009494A (en) * | 2015-06-24 | 2017-01-12 | 富士通株式会社 | Color measuring device |
| CN107481664A (en) * | 2017-09-28 | 2017-12-15 | 京东方科技集团股份有限公司 | Display panel and its driving method, display device |
| EP4228012A1 (en) * | 2022-02-12 | 2023-08-16 | Instytut Wysokich Cisnien Polskiej Akademii Nauk | Wavelength tunable light emitting diode and method of making the same |
| CN116524852A (en) * | 2023-07-05 | 2023-08-01 | 禹创半导体(深圳)有限公司 | LED display panel and pixel color display method and device thereof |
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| Publication number | Publication date |
|---|---|
| JP4027609B2 (en) | 2007-12-26 |
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