JPH07176794A - Planar light source - Google Patents

Planar light source

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Publication number
JPH07176794A
JPH07176794A JP5318276A JP31827693A JPH07176794A JP H07176794 A JPH07176794 A JP H07176794A JP 5318276 A JP5318276 A JP 5318276A JP 31827693 A JP31827693 A JP 31827693A JP H07176794 A JPH07176794 A JP H07176794A
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Japan
Prior art keywords
light
light source
fluorescent
guide plate
scattering layer
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Pending
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JP5318276A
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Japanese (ja)
Inventor
Yoshinori Shimizu
義則 清水
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Nichia Chem Ind Ltd
日亜化学工業株式会社
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Application filed by Nichia Chem Ind Ltd, 日亜化学工業株式会社 filed Critical Nichia Chem Ind Ltd
Priority to JP5318276A priority Critical patent/JPH07176794A/en
Publication of JPH07176794A publication Critical patent/JPH07176794A/en
Application status is Pending legal-status Critical

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Abstract

PURPOSE:To provide a planar light source wherein a blue light emitting diode is used and white luminescence is feasible, and wherein uniform white luminescence can be observed. CONSTITUTION:Light emitting diodes 1 are optically connected with the end of a transparent light transmitting plate 2. A fluorescent substance that emits light when energized by the luminescence of the blue light emitting diodes 1 and white powder that scatters fluorescence, are mixed. The resultant mixture is applied to either of the major surfaces of the light transmitting plate 2 to form a fluorescence scattering layer 3. The wavelength of the luminescence of the blue light emitting diodes 1 is changed through the fluorescence scattering layer 3.

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面状の光源に係り、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面状光源に関する。 The present invention relates to a display backlight, relates to a planar light source used for illuminated operation switch or the like, relates to a planar light source which may be used particularly suitably 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。 BACKGROUND ART Generally, a notebook computer, a planar light source for back light of a liquid crystal display used in the word processor, for example EL, cold cathode tubes are used. EL 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。 Is itself a planar light source, a cold cathode tube is a surface light source using a diffuser, most currently emission color of their backlight is white.

【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。 [0003] (hereinafter referred to as LED.) Light-emitting diodes have also been partially utilized as a light source for the backlight. 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、 However, when obtaining white light emission using an LED, for emitting output of the blue LED is only about several tens of μW in the conventional,
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。 Other red LED, the realizing white light emission with a green LED, there is a disadvantage that they hardly change in color is matched to the characteristics of each color light emitting LED is large. また、三原色のL In addition, the three primary colors of 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。 By aggregating ED, be arranged in a geometrically identical coplanar, because as the backlight viewing at a position close to their LED, a be a uniform white light source impossible It was. 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 Thus the planar light source of the current white LCD backlight, a cold cathode tube is large, the small-medium sized 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。 In current situation is used selectively as L, the backlight of the white light emission using an LED is largely unknown.

【0004】また白色発光、あるいはモノクロの光源として、一部では青色LEDチップの周囲を蛍光物質を含む樹脂で包囲して色変換する試みもあるが、チップ周辺は太陽光よりも強い放射強度の光線にさらされるため、 [0004] as a white luminescence, or monochromatic light source, in some there is also an attempt to surround to the color conversion around the blue LED chip with a resin containing a fluorescent substance, the chip peripheral is stronger radiation intensity than sunlight because they are exposed to light,
蛍光物質の劣化が問題となり、特に有機蛍光顔料で顕著である。 Deterioration of the fluorescent substance becomes a problem is particularly pronounced in the organic fluorescent pigment. 更にイオン性の有機染料はチップ近傍では直流電界により電気泳動を起こし、色調が変化する可能性がある。 Further ionic organic dyes undergoes electrophoresed on a DC electric field in the tip vicinity, there is a possibility that the color tone is changed. また従来の青色LEDは蛍光物質で色変換するには十分な出力を有しておらず、たとえ色変換したとしても実用できるものではなかった。 The conventional blue LED has no sufficient output to the color conversion by the fluorescent substance, it was not be practiced even if if the color conversion.

【0005】 [0005]

【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面状光源を実現すると共に、均一な白色発光を観測できる面状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面状光源を提供し、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することにある。 The present invention 0005] has been made to solve such drawbacks, and has as its object, using the LED, white light emission can be planar available mainly as a backlight it is possible to realize a light source, is to provide a uniform white light emission can be observed planar light source, further provide any color surface light source capable of emitting light of other than white, the characteristics of the LED having excellent reliability using, it is to use the various operation switches and the like.

【0006】 [0006]

【課題を解決するための手段】本発明の面状光源は、透明な導光板の端面の少なくとも一箇所に青色LED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、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(以下、 Means for Solving the Problems] The planar light source of the present invention, the blue LED in at least one portion of the end face of the transparent light guide plate is optically connected, whereas further one of the main surface of the light guide plate to, a fluorescent material which is excited to fluoresce by the light emission of the blue light-emitting diodes, fluorescent scattering layer applied in a state where a white powder capable of scattering light are mixed (hereinafter,
蛍光散乱層側の主面を第二の主面という。 The main surface of the fluorescent scattering layer side of the second major surface. )を有し、前記青色発光ダイオードの発光の一部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(以下発光観測側の主面を第一の主面という。)側から観測されることを特徴とする。 ) Has, the blue portion of the light-emitting diode is wavelength converted by the fluorescent scattering layer, the fluorescent scattering layer opposite the major surface of the light guide plate (main principal surface of the light emission observing side first below characterized in that it is observed from the surface of.) side.

【0007】図1は本発明の面状光源の導光板2を蛍光散乱層3側から見た平面図である。 [0007] Figure 1 is a plan view of the light guide plate 2 of the planar light source of the present invention from the fluorescent scattering layer 3 side. 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 The light guide plate 2, for example acrylic, made of a transparent material such as glass, by blue LED1 is embedded in the end face of the light guide plate 2, the light guide plate 2
と青色LED1とが光学的に接続されている。 And the blue LED1 are connected optically. 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LEDの発光を導くことによって実現可能である。 In the present invention, is that the end surfaces of the blue LED1 and the light guide plate 2 are optically connected, Briefly, refers to the introduction of a light blue LED from the end face of the light guide plate 2, for example, FIG. it is, of course be embedded blue LED1 as shown in, or adhered to a blue LED, also be achieved by directing the light emission of the blue LED on the end face of the light guide plate 2 by using an optical fiber or the like.

【0008】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の発光を蛍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。 [0008] Then, fluorescent scattering layer 3, as can be observed a desired color, becomes the ink obtained by compounding the fluorescent substance and a white pigment is applied, the wavelength conversion light emission of the blue LED1 with a fluorescent substance at the same time, and it scatters the fluorescence into the light guide plate 2 as a white pigment. 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、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。 Particularly in Figure 1 the fluorescent scattering layer 3 and the dot-shaped, so that the surface luminance of the first main surface side is constant, as it approaches the LED1, fluorescent scattering layer per unit area of ​​the second main surface side a pattern as to reduce the third area, further are slightly smaller than the somewhat maximum area is the area of ​​the end portion of the second major surface furthest away and LED1.
ここで、図1中の■は蛍光散乱層3のパターンを表している。 Here, in FIG. 1 ■ represents the pattern of fluorescent scattering layer 3. 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、L Although the two arranged structure on one end surface of the blue LED in FIG. 1, the light guide plate may connect the LED to the four sides of the end faces of all if square course, L
EDの個数も限定するものではない。 Not intended to limit the number of ED. 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。 Furthermore, the disposition of an LED, applying the shape of the fluorescent scattering layer to the light emission observed from the first main surface side and the planar uniformity, can be changed appropriately coated state.

【0009】 [0009]

【作用】図2は本発明の面状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。 [Action] FIG 2 is a schematic sectional view when mounting the surface light source of the present invention, for example, as a backlight of a liquid crystal panel.
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。 This is the second major surface of the planar light source shown in FIG. 1, for example, barium titanate, titanium oxide, and a scattering reflection layer 6 made of aluminum oxide, for example a reflector and a base 7 made of Al are laminated was placed, the surface on the first main surface side has established a light diffusion plate 5 which is uneven, these configurations are not particularly changed and the backlight of the light source and a cold cathode tube.

【0010】まず図2の矢印で示すように、青色LED [0010] First, as shown by the arrows in FIG. 2, the blue 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。 The light emitted from 1, but is radiated to the outside of the other part light guide plate in the chip near, most of the light while repeating total reflection through the light guide plate 2, reaches the end face of the light guide plate. 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。 Light reaching the end face is reflected on the reflection film 4 formed on all end faces, repeating total reflection. 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。 At this time, part of the light by the fluorescent scattering layer 3 provided on the second main surface side of the light guide plate 2 is scattered, and some of the light is absorbed by the fluorescent material is radiated to wavelength conversion at the same time, guide emission color is observed from the first main surface side of the optical plate 2 can be observed the light obtained by combining those light. 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。 For example, in the orange fluorescent pigment and the planar light source provided with a fluorescent scattering layer 3 formed of a white pigment, the effect mentioned above can be observed color of light emitted from the blue LED becomes white. 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。 The color tone can be adjusted arbitrarily by the mixing ratio of type and a white pigment of the fluorescent substance. 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 Especially the emission wavelength of one blue LED in the present invention is shorter than the main emission peak is 500 nm, the emission output 200μW
以上、更に好ましくは300μW以上の出力が必要である。 Or more, more preferably it requires output of more than 300 [mu] W. 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 Because all colors when emission wavelength is 500nm or more is hardly realized, also the light emission output 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。 If it is less than, because even if the end face of the light guide plate to increase the number of blue LED optically connecting a uniform planar light emitting light source with sufficient brightness in the resulting less likely.

【0011】 [0011]

【実施例】 【Example】

[実施例1]厚さ約2mmのアクリル板の片面に、図1 On one side of the Example 1 having a thickness of about 2mm acrylic plate, FIG. 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。 Dot-like pattern shown in, a fluorescent scattering layer 3 was formed by screen printing. 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−001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: Fluorescent scattering layer 3, a fluorescent pigment and a company manufactured FA-005 were mixed in equal amounts is Shinroihi Chemical Co. FA-001 and the green fluorescent pigment is a red fluorescent pigment, in a weight ratio of barium titanate as a white powder 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。 5 were mixed at a ratio of which was formed by printing which is dispersed in the acrylic binder.

【0012】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。 [0012] then the above way the fluorescence scattering layer acrylic plate formed by cutting according to a desired pattern, after polishing all end surface of the acrylic plate (cut surface), a reflective layer of Al on the polished surface 4 by forming, to obtain a light guide plate 2 fluorescent scattering layer 3 is formed.

【0013】前記導光板2の端面に二箇所、穴を設け、 [0013] two places on the end face of the light guide plate 2, a hole is provided,
その穴に発光波長480nm。 Emission wavelength 480nm in the hole. 発光出力1200μWを有する窒化ガリウム系化合物半導体よりなる青色LED Blue LED formed of gallium nitride-based compound semiconductor having an emission output 1200μW
をそれぞれ1個づつ埋め込むことにより、本発明の面状光源を得た。 By embedding one by one, respectively, to obtain a surface light source of the present invention. この面状光源の青色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。 The blue LED of the planar light source was simultaneously lit, substantially uniform planar light emitting white tinged slightly yellowish from light emission observing surface side of the light guide plate 2 was obtained. 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。 Furthermore, a light diffusion plate 5 which previously matted has been subjected to the light emission observing surface side, by installing a reflector barium titanate layer 6 on the Al base 7 on the fluorescence scattering layer 3 side is applied, a backlight When as a light source, perfectly planar uniform white light emission from the light diffusion plate 5 side is obtained. 輝度は55cd/m 2であった。 Luminance was 55 cd / m 2.

【0014】[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 [0014] [Example 2] fluorescent scattering layer 3, BASF Corporation LumogenF Yellow as a yellow fluorescent dye
−083と橙色蛍光染料として同社製Orenge−2 -083 and manufactured by the same company Orenge-2 as an orange fluorescent dye
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面状光源を得たところ、ほぼ均一な面状発光が観測された。 And 40 were approximately equal amounts mixed them with fluorescent dye dissolved in butyl carbitol acetate, 1 and a barium titanate in a weight ratio as a white substance (dye) is formed using a mixture in a ratio of 200 others, was to obtain a planar light source of the present invention in the same manner as in example 1, substantially uniform planar light emission was observed. 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。 Furthermore was a backlight light source in the same manner, perfectly uniform planar light emission was observed.

【0015】 [0015]

【発明の効果】以上説明したように、本発明の面状光源は、青色LEDを用い、しかも導光板の片方の面に青色LEDにより波長変換できる蛍光物質と白色粉末とを含有した蛍光散乱層を有していることにより、信頼性に優れたLEDによる面状光源を実現することが可能となった。 As described above, according to the present invention, a planar light source of the present invention, fluorescent scattering layer containing a fluorescent material and a white powder capable of wavelength conversion by the blue LED on one surface of a blue LED, yet the light guide plate by having a, it has become possible to realize a surface light source by excellent LED reliability. しかも蛍光散乱層の白色粉末は、蛍光物質により波長変換された光を反射、拡散させる作用があるため、使用する蛍光物質の使用量が少なくて済む。 Moreover white powder fluorescent scattering layer, reflects light whose wavelength is converted by a fluorescent substance, because of the effect of diffusing requires less amount of the fluorescent material used. 更に好都合なことには、LEDチップと蛍光物質とが直接接することがないので、蛍光物質の劣化が少なく、長期間に渡って面状光源の色調変化を起こすことがない。 Further Advantageously, since the LED chip and the fluorescent material is never in direct contact, less deterioration of the fluorescent substance, is not to cause color change of the surface light source for a long period of time. さらに、色調に関しては、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を提供することができる。 Further, with respect to color, a fluorescent substance, the kind of white powder, by changing the mixing ratio or the like, it is possible to provide any color, including white.

【0016】一方蛍光散乱層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 [0016] As one side to excite the fluorescent scattering layer, the light emitting output of the blue LED used is most preferably 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面状光源を実現することができる。 With more than, it is possible to realize a bright surface light source a large area efficiently wavelength converted by the fluorescent substance. このように、本願の面状光源は、バックライト用光源とだけでなく、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。 Thus, the surface light source of the present application, not only as a backlight source may be utilized to illuminated operation switch or the like which utilizes a fluorescent substance.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】 本発明の一実施例の面状光源の導光板2を蛍光散乱層3側から見た平面図。 Figure 1 is a plan view seen from the fluorescence scattering layer 3 side to an embodiment the light guide plate 2 of the planar light source of the present invention.

【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。 Schematic sectional view of a planar light source of the embodiment is implemented as a backlight of the present invention; FIG.

【符号の説明】 DESCRIPTION OF SYMBOLS

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 diffuser plate 6 ----- scattered reflection layer 7 ····· Al base

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 透明な導光板の端面の少なくとも一箇所に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面状光源。 [Claim 1] A blue light emitting diode is optically connected to at least one portion of the end face of the transparent light guide plate, one further one of the main surface of the light guide plate is excited by light emission of the blue light-emitting diode Te and a fluorescent substance which emits fluorescence having a fluorescence scattering layer applied in a state in which the white powder that scatters the fluorescence is mixed, the emission of the blue light emitting diode is wavelength converted by the fluorescent scattering layer, the fluorescent scattering surface light source, characterized in that it is observed from the main surface side opposite to the light guide plate and the layer.
  2. 【請求項2】 前記青色発光ダイオードは、その主発光波長が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に記載の面状光源。 Wherein said blue light emitting diode, whose main emission wavelength is shorter than 500 nm, the surface light source of claim 1, the light output is characterized in that at least 500 W.
JP5318276A 1993-12-17 1993-12-17 Planar light source Pending JPH07176794A (en)

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JPH07176794A true JPH07176794A (en) 1995-07-14

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