JP2002358812A - Light source using galium nitride compound semiconductor - Google Patents
Light source using galium nitride compound semiconductorInfo
- Publication number
- JP2002358812A JP2002358812A JP2002077304A JP2002077304A JP2002358812A JP 2002358812 A JP2002358812 A JP 2002358812A JP 2002077304 A JP2002077304 A JP 2002077304A JP 2002077304 A JP2002077304 A JP 2002077304A JP 2002358812 A JP2002358812 A JP 2002358812A
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- Prior art keywords
- light
- fluorescent
- guide plate
- light source
- emitting diode
- Prior art date
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- Led Devices (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主として、ディス
プレイのバックライト、照光式操作スイッチ等に使用さ
れる光源に係り、特に液晶ディスプレイのバックライト
として好適に用いることができる光源に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source used mainly for a backlight of a display, an illuminated operation switch and the like, and more particularly to a light source which can be suitably used as a backlight of a liquid crystal display.
【０００２】[0002]
【従来の技術】一般にノート型パソコン、ワープロ等に
使用される液晶ディスプレイのバックライト用の面状光
源には、例えばＥＬ、冷陰極管が使用されている。ＥＬ
はそれ自体が面状光源であり、冷陰極管は拡散板を用い
て面状光源とされ、現在それらのバックライトの発光色
はほとんどが白色とされている。2. Description of the Related Art As a planar light source for a backlight of a liquid crystal display generally used for a notebook personal computer, a word processor, etc., for example, an EL or a cold cathode tube is used. EL
Is itself a planar light source, the cold cathode fluorescent lamp is a planar light source using a diffusion plate, and most of the backlights emit white light at present.
【０００３】一方発光ダイオード（以下ＬＥＤと記
す。）もバックライト用光源として一部利用されてい
る。しかしＬＥＤを用いて白色発光を得る場合、従来で
は青色ＬＥＤの発光出力が数十μＷほどしかないため、
他の赤色ＬＥＤ、緑色ＬＥＤを用いて白色発光を実現さ
せるには、それら各色発光ＬＥＤの特性を合致させにく
く色変化が大きいという欠点がある。また、三原色のＬ
ＥＤを集合させて、同一平面上に幾何学的に同じ位置に
配置しても、バックライトとしてはそれらのＬＥＤを接
近した位置で視認するため、均一な白色光源にすること
は不可能であった。従って現在白色の液晶バックライト
の面状光源には、大型では冷陰極管、小型〜中型にはＥ
Ｌと使い分けられているのが現状で、ＬＥＤを用いた白
色発光のバックライトはほとんど知られていない。On the other hand, light emitting diodes (hereinafter, referred to as LEDs) are also partially used as light sources for backlights. However, when white light emission is obtained using an LED, the emission output of a blue LED is only about several tens of μW conventionally,
In order to realize white light emission using other red LED and green LED, there is a disadvantage that the characteristics of each color light emitting LED are hardly matched and a color change is large. Also, the three primary colors L
Even if the EDs are assembled and arranged at the same geometric position on the same plane, it is impossible to provide a uniform white light source because the LEDs are visible at a close position as a backlight. Was. Therefore, the surface light source of a currently white liquid crystal backlight is a cold cathode tube for a large size, and an E for a small to medium size.
At present, backlights that emit white light using LEDs are hardly known.
【０００４】[0004]
【発明が解決しようとする課題】本発明はこのような欠
点を解決するために成されたもので、その目的とすると
ころは、ＬＥＤを用い、主としてバックライトとして利
用できる白色発光可能な光源を実現すると共に、均一な
白色発光を観測できる光源を提供することにあり、さら
には白色以外の任意色の発光が可能な光源を提供し、信
頼性に優れたＬＥＤの特性を利用し、各種操作スイッチ
等に利用できる窒化ガリウム系化合物半導体を用いた光
源を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve such a drawback, and an object of the present invention is to provide a light source capable of emitting white light which can be mainly used as a backlight by using an LED. In addition to providing a light source capable of observing uniform white light emission, and also providing a light source capable of emitting light of any color other than white, utilizing the characteristics of an LED with excellent reliability, An object of the present invention is to provide a light source using a gallium nitride-based compound semiconductor that can be used for a switch or the like.
【０００５】[0005]
【課題を解決するための手段】本発明の光源は、窒化ガ
リウム系化合物半導体よりなる青色ＬＥＤと、青色ＬＥ
Ｄと光学的に接続された透明材料と透明材料に設けられ
た蛍光物質とを有する。蛍光物質は、青色ＬＥＤが放出
した青色光の一部を吸収し波長変換して蛍光を発する。
透明材料から、青色ＬＥＤが放出した青色光と蛍光物質
が波長変換して放射した蛍光の合成した光を放出させ
る。A light source according to the present invention comprises a blue LED made of a gallium nitride compound semiconductor and a blue LE.
A transparent material optically connected to D; and a fluorescent material provided on the transparent material. The fluorescent substance absorbs a part of the blue light emitted by the blue LED, converts the wavelength, and emits fluorescence.
From the transparent material, the combined light of the blue light emitted by the blue LED and the fluorescent light emitted by the fluorescent substance after wavelength conversion is emitted.
【０００６】図１は、本発明の実施例にかかる光源の導
光板２を蛍光散乱層３側から見た平面図である。導光板
２は例えばアクリル、硝子等の透明な材料よりなり、そ
の導光板２の端面に青色ＬＥＤ１が埋設されることによ
り、導光板２と青色ＬＥＤ１とが光学的に接続されてい
る。なお本発明において、青色ＬＥＤ１と導光板２の端
面とが光学的に接続されているとは、簡単に言えば、導
光板２の端面から青色ＬＥＤの光を導入することをい
い、例えばこの図に示すように青色ＬＥＤ１を埋設する
ことはもちろんのこと、青色ＬＥＤを接着したり、ま
た、光ファイバー等を用いて導光板２の端面に青色ＬＥ
Ｄの発光を導くことによって実現可能である。FIG. 1 is a plan view of a light guide plate 2 of a light source according to an embodiment of the present invention as viewed from the side of a fluorescent scattering layer 3. The light guide plate 2 is made of, for example, a transparent material such as acrylic or glass, and the blue LED 1 is embedded in an end surface of the light guide plate 2 so that the light guide plate 2 and the blue LED 1 are optically connected. In the present invention, that the blue LED 1 and the end face of the light guide plate 2 are optically connected means that light of the blue LED is introduced from the end face of the light guide plate 2 in a simple manner. The blue LED 1 is buried, as shown in FIG. 2, and the blue LED is adhered to the end face of the light guide plate 2 using an optical fiber or the like.
This can be realized by guiding D emission.
【０００７】次に、蛍光散乱層３は、所望の色が観測で
きるように、蛍光物質と白色顔料とを調合したインクが
塗布されてなり、青色ＬＥＤ１の発光を導光物質で波長
変換すると同時に、白色顔料でその蛍光を導光板２内に
散乱させている。特に図１では前記蛍光散乱層３をドッ
ト状とし、第一の主面側の表面輝度が一定となるよう
に、青色ＬＥＤ１に接近するにつれて、第二の主面側の
単位面積あたりの蛍光散乱層３の面積を減じるようなパ
ターンとし、さらには青色ＬＥＤ１と最も離れた第二の
主面の端部の面積はやや最大面積に比して若干小さくし
ている。ここで、図１中の▲黒四角▼は蛍光散乱層３の
パターンを表している。図１では青色ＬＥＤを一つの端
面に２個配した構造としているが、導光板が四角形であ
れば四方の端面全てにＬＥＤを接続してもよいことはい
うまでもなく、ＬＥＤの個数も限定するものではない。
さらに、ＬＥＤの配置状況により、第一の主面側から観
測する発光を面状均一とするように蛍光散乱層の塗布形
状、塗布状態を適宜変更することができる。Next, the fluorescent scattering layer 3 is coated with an ink prepared by mixing a fluorescent substance and a white pigment so that a desired color can be observed. The fluorescent light is scattered in the light guide plate 2 by a white pigment. In particular, in FIG. 1, the fluorescence scattering layer 3 is formed in a dot shape, and the fluorescence scattering per unit area on the second main surface side as approaching the blue LED 1 so that the surface luminance on the first main surface side becomes constant. The pattern is such that the area of the layer 3 is reduced, and the area of the end of the second main surface farthest from the blue LED 1 is slightly smaller than the maximum area. Here, the black square in FIG. 1 represents the pattern of the fluorescent scattering layer 3. Although FIG. 1 shows a structure in which two blue LEDs are arranged on one end face, it is needless to say that LEDs may be connected to all four end faces if the light guide plate is square, and the number of LEDs is also limited. It does not do.
Further, the application shape and application state of the fluorescent scattering layer can be appropriately changed so that the light emission observed from the first main surface side is made uniform in a plane depending on the arrangement of the LEDs.
【０００８】[0008]
【作用】図２は本発明の実施例の光源を例えば液晶パネ
ルのバックライトとして実装した場合の模式断面図であ
る。これは図１に示す面状光源の第二の主面側に、例え
ばチタン酸バリウム、酸化チタン、酸化アルミニウム等
よりなる散乱反射層６と、例えばＡｌよりなるベース７
とが積層された反射板を設置し、第一の主面側に表面が
凹凸とされている光拡散板５を設置しており、これらの
構成は光源を冷陰極管とするバックライトと特に変わる
ものではない。FIG. 2 is a schematic sectional view showing a case where the light source according to the embodiment of the present invention is mounted as, for example, a backlight of a liquid crystal panel. This is because a scattering reflection layer 6 made of, for example, barium titanate, titanium oxide, aluminum oxide, or the like, and a base 7 made of, for example, Al are provided on the second main surface side of the planar light source shown in FIG.
And a light diffusing plate 5 having an uneven surface on the first main surface side. It does not change.
【０００９】まず図２の矢印で示すように、青色ＬＥＤ
１から出た光は、チップ近傍で一部導光板以外の外部に
放射されるが、大部分の光は導光板２の中を全反射を繰
り返しながら、導光板の端面に達する。端面に達した光
は端面全てに形成された反射膜４に反射されて、全反射
を繰り返す。この時、導光板２の第二の主面側に設けら
れた蛍光散乱層３により一部の光は散乱され、また一部
の光は蛍光物質により吸収され同時に波長変換されて放
射され、導光板２の第一の主面側から観測する発光色は
これらの光を合成した光が観測できる。例えば橙色の蛍
光顔料と白色顔料からなる蛍光散乱層３を設けた面状光
源では、先に述べた作用により、青色ＬＥＤからの発光
色が白色となって観測できる。また色調は蛍光物質の種
類と白色顔料の混合比により任意に調整できる。特に本
発明では一つの青色ＬＥＤの発光波長はその主発光ピー
クが５００ｎｍよりも短く、その発光出力は２００μＷ
以上、更に好ましくは３００μＷ以上の出力が必要であ
る。なぜなら発光波長が５００ｎｍ以上であると全ての
色が実現しにくくなり、またその発光出力が２００μＷ
よりも少ないと、たとえ導光板の端面に光学的に接続す
る青色ＬＥＤの数を増やしても、充分な明るさの均一な
面状発光の光源が得られにくい傾向にあるからである。First, as shown by the arrow in FIG.
Light emitted from 1 is partially radiated outside the light guide plate near the chip, but most of the light reaches the end face of the light guide plate while repeating total reflection in the light guide plate 2. The light that reaches the end face is reflected by the reflection film 4 formed on the entire end face, and repeats total reflection. At this time, a part of the light is scattered by the fluorescent scattering layer 3 provided on the second main surface side of the light guide plate 2, and a part of the light is absorbed by the fluorescent substance, and the wavelength is simultaneously converted and emitted. The emission color observed from the first main surface side of the light plate 2 can be obtained by combining these lights. For example, in the planar light source provided with the fluorescent scattering layer 3 made of an orange fluorescent pigment and a white pigment, the emission color of the blue LED can be observed as white due to the above-described operation. Further, the color tone can be arbitrarily adjusted by the kind of the fluorescent substance and the mixing ratio of the white pigment. In particular, in the present invention, the emission wavelength of one blue LED has a main emission peak shorter than 500 nm, and the emission output thereof is 200 μW
As described above, more preferably, an output of 300 μW or more is required. If the emission wavelength is 500 nm or more, it is difficult to realize all colors, and the emission output is 200 μW
If the number is smaller than that, even if the number of blue LEDs optically connected to the end face of the light guide plate is increased, it tends to be difficult to obtain a light source of planar light emission with sufficient brightness and uniformity.
【００１０】[0010]
【発明の実施の形態】［実施例１］厚さ約２ｍｍのアク
リル板の片面に、図１に示すドット状のパターンで、蛍
光散乱層３をスクリーン印刷により形成した。蛍光散乱
層３は、赤色蛍光顔料であるシンロイヒ化学製ＦＡ−０
０１と緑色蛍光顔料である同社製ＦＡ−００５とを等量
に混合した蛍光顔料と、白色粉末としてチタン酸バリウ
ムとを重量比で１：５の割合で混合し、それをアクリル
系バインダー中に分散したものを印刷して形成した。DESCRIPTION OF THE PREFERRED EMBODIMENTS Example 1 A fluorescent scattering layer 3 was formed by screen printing on one surface of an acrylic plate having a thickness of about 2 mm in a dot pattern shown in FIG. The fluorescent scattering layer 3 is a red fluorescent pigment, FA-0 manufactured by Shinloygi Chemical.
01 and FA-005, a green fluorescent pigment manufactured by the same company, are mixed in equal amounts, and barium titanate as a white powder is mixed at a weight ratio of 1: 5, and the mixture is added to an acrylic binder. The dispersion was formed by printing.
【００１１】次に上記のようにして蛍光散乱層が形成さ
れたアクリル板を、所望のパターンに従って切断し、ア
クリル板の端面（切断面）を全て研磨した後、研磨面に
Ａｌよりなる反射層４を形成することにより、蛍光散乱
層３が形成された導光板２を得た。Next, the acrylic plate on which the fluorescent scattering layer is formed as described above is cut in accordance with a desired pattern, and all the end faces (cut surfaces) of the acrylic plate are polished. By forming No. 4, the light guide plate 2 on which the fluorescent scattering layer 3 was formed was obtained.
【００１２】前記導光板２の端面に二箇所に、穴を設
け、その穴に発光波長４８０ｎｍ、発光出力１２００μ
Ｗを有する窒化ガリウム系化合物半導体よりなる青色Ｌ
ＥＤをそれぞれ１個づつ埋め込むことにより、本発明の
実施例の光源を得た。この光源の青色ＬＥＤを同時に点
灯させたところ、導光板２の発光観測面側からはやや黄
色みを帯びた白色のほぼ均一な面状発光が得られた。さ
らに、発光観測面側に予めマット加工が施された光拡散
板５と、蛍光散乱層３側にＡｌベース７上にチタン酸バ
リウム層６が塗布された反射板を設置して、バックライ
ト用光源としたところ、光拡散板５側から完全に面状均
一な白色発光が得られた。輝度は５５ｃｄ／ｍ２であっ
た。Holes are provided at two places on the end surface of the light guide plate 2, and the light emission wavelength is 480 nm and the light emission output is 1200 μm.
Blue L made of gallium nitride based compound semiconductor having W
By embedding EDs one by one, a light source according to an embodiment of the present invention was obtained. When the blue LEDs of this light source were simultaneously turned on, a slightly yellowish white almost uniform surface light emission was obtained from the light emission observation surface side of the light guide plate 2. Further, a light diffusion plate 5 pre-matted on the emission observation surface side and a reflection plate coated with a barium titanate layer 6 on an Al base 7 on the fluorescence scattering layer 3 side are installed on the side of the fluorescence scattering layer 3 to provide a backlight. When the light source was used, white light emission with a completely uniform surface was obtained from the light diffusion plate 5 side. The brightness was 55 cd / m 2 .
【００１３】［実施例２］蛍光散乱層３を、黄色蛍光染
料としてＢＡＳＦ社のＬｕｍｏｇｅｎＦ Ｙｅｌｌｏｗ
−０８３と橙色蛍光染料として同社製Ｏｒｅｎｇｅ−２
４０とをほぼ等量混合し、それらをブチルカルビトール
アセテートに溶解した蛍光染料と、白色物質としてチタ
ン酸バリウムとを重量比で１（染料）：２００の割合で
混合したものを用いて形成する他は、実施例１と同様に
して本発明の光源を得たところ、ほぼ均一な面状発光が
観測された。さらに同様にしてバックライト用光源とし
たところ、完全に均一な面状発光が観測された。[Example 2] The fluorescent scattering layer 3 was used as a yellow fluorescent dye by Lumogen F Yellow of BASF.
-083 and Orange-2 manufactured by the company as an orange fluorescent dye
40 and an approximately equal amount, and a mixture of a fluorescent dye obtained by dissolving them in butyl carbitol acetate and barium titanate as a white substance in a weight ratio of 1 (dye): 200 is used. Other than that, when the light source of the present invention was obtained in the same manner as in Example 1, substantially uniform planar light emission was observed. Furthermore, when the light source for a backlight was used in the same manner, completely uniform planar light emission was observed.
【００１４】[0014]
【発明の効果】以上説明したように、本発明の光源は、
青色発光の窒化ガリウム系化合物半導体を用い、蛍光物
質、白色粉末の種類、混合量等を変更することにより、
白色を含め任意の色調の合成光を提供することができ
る。As described above, the light source of the present invention has the following features.
By using a gallium nitride-based compound semiconductor emitting blue light, changing the type of fluorescent substance, white powder, mixing amount, etc.,
Synthetic light of any color tone including white can be provided.
【００１５】一方蛍光物質を励起する側として、最も好
ましくは使用する青色ＬＥＤの発光出力が２００μＷ以
上のものとすることにより、蛍光物質により効率的に波
長変換して大きな面積の明るい光源を実現することがで
きる。このように、本願の光源は、バックライト用光源
等だけでなく、蛍光物質を利用した照光式操作スイッチ
等に利用することもできる。On the other hand, on the side for exciting the fluorescent substance, it is most preferable that the emission output of the blue LED to be used is 200 μW or more, so that the wavelength can be efficiently converted by the fluorescent substance to realize a large area bright light source. be able to. As described above, the light source of the present application can be used not only for a light source for a backlight or the like but also for an illuminated operation switch or the like using a fluorescent substance.
【図１】 本発明の一実施例の面状光源の導光板を蛍光
散乱層側から見た平面図FIG. 1 is a plan view of a light guide plate of a planar light source according to an embodiment of the present invention as viewed from a fluorescent scattering layer side.
【図２】 本発明の一実施例の面状光源をバックライト
として実装した場合の模式断面図FIG. 2 is a schematic cross-sectional view when a planar light source according to one embodiment of the present invention is mounted as a backlight.
１・・・・・青色ＬＥＤ ２・・・・・導光板 ３・・・・・蛍光散乱層 ４・・・・・反射層 ５・・・・・光拡散板 ６・・・・・散乱反射層 ７・・・・・Ａｌベース 1 Blue LED 2 Light guide plate 3 Fluorescent scattering layer 4 Reflective layer 5 Light diffusion plate 6 Scattered reflection Layer 7 ... Al base
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｆ２１Ｙ 101:02 Ｆ２１Ｙ 101:02 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) // F21Y 101: 02 F21Y 101: 02
Claims (2)
に窒化ガリウム系化合物半導体よりなる青色発光ダイオ
ードが光学的に接続されており、さらに前記導光板の主
面のいずれか一方に、前記青色発光ダイオードの発光に
より励起されて蛍光を発する蛍光物質と、蛍光を散乱さ
せる白色粉末とが混合された状態で塗布された蛍光散乱
層を有し、前記青色発光ダイオードの発光が前記蛍光散
乱層で波長変換され、前記蛍光散乱層と反対側の導光板
の主面側から観測されることを特徴とする窒化ガリウム
系化合物半導体を用いた光源。1. A blue light-emitting diode made of a gallium nitride-based compound semiconductor is optically connected to at least one end face of a transparent light guide plate, and the blue light-emitting diode is further connected to one of the main surfaces of the light guide plate. A fluorescent substance that emits fluorescence when excited by light emission of the light emitting diode, and a fluorescent scattering layer applied in a state where white powder that scatters the fluorescent light is mixed, and the light emission of the blue light emitting diode is emitted by the fluorescent scattering layer. A light source using a gallium nitride-based compound semiconductor, wherein the wavelength is converted and observed from the main surface side of the light guide plate opposite to the fluorescent scattering layer.
波長が５００ｎｍよりも短く、発光出力が５００μＷ以
上であることを特徴とする請求項１に記載の窒化ガリウ
ム系化合物半導体を用いた光源。2. The light source according to claim 1, wherein the blue light emitting diode has a main light emission wavelength shorter than 500 nm and a light emission output of 500 μW or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002077304A JP2002358812A (en) | 2002-02-12 | 2002-02-12 | Light source using galium nitride compound semiconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002077304A JP2002358812A (en) | 2002-02-12 | 2002-02-12 | Light source using galium nitride compound semiconductor |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9147337A Division JPH1097200A (en) | 1997-05-20 | 1997-05-20 | Light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002358812A true JP2002358812A (en) | 2002-12-13 |
Family
ID=19193290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002077304A Withdrawn JP2002358812A (en) | 2002-02-12 | 2002-02-12 | Light source using galium nitride compound semiconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002358812A (en) |
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| JP2006073202A (en) * | 2004-08-31 | 2006-03-16 | Nichia Chem Ind Ltd | Light emitting device |
| CN100376963C (en) * | 2004-12-18 | 2008-03-26 | 群康科技(深圳)有限公司 | Backlight module assembly |
| JP2009295501A (en) * | 2008-06-06 | 2009-12-17 | Sharp Corp | Light source module and electronic apparatus equipped with the same |
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| CN102120212A (en) * | 2010-12-09 | 2011-07-13 | 惠州雷曼光电科技有限公司 | LED and dispensing method of LED fluorescent powder |
| CN102374492A (en) * | 2010-08-12 | 2012-03-14 | 海洋王照明科技股份有限公司 | Light guide plate and preparation method thereof, light-emitting diode (LED) plane light source and display |
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2002
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| JP2006073202A (en) * | 2004-08-31 | 2006-03-16 | Nichia Chem Ind Ltd | Light emitting device |
| CN100376963C (en) * | 2004-12-18 | 2008-03-26 | 群康科技(深圳)有限公司 | Backlight module assembly |
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| JP2014089966A (en) * | 2007-06-25 | 2014-05-15 | Qd Vision Inc | Compositions, optical component, system including optical component, devices, and other products |
| JP2009295501A (en) * | 2008-06-06 | 2009-12-17 | Sharp Corp | Light source module and electronic apparatus equipped with the same |
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| CN102374492A (en) * | 2010-08-12 | 2012-03-14 | 海洋王照明科技股份有限公司 | Light guide plate and preparation method thereof, light-emitting diode (LED) plane light source and display |
| CN102120212A (en) * | 2010-12-09 | 2011-07-13 | 惠州雷曼光电科技有限公司 | LED and dispensing method of LED fluorescent powder |
| WO2012137584A1 (en) * | 2011-04-07 | 2012-10-11 | 日本電気株式会社 | Optical element, illumination device, and projection display device |
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