JPH087614A - Sheet-like light source - Google Patents

Sheet-like light source

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Publication number
JPH087614A
JPH087614A JP13476394A JP13476394A JPH087614A JP H087614 A JPH087614 A JP H087614A JP 13476394 A JP13476394 A JP 13476394A JP 13476394 A JP13476394 A JP 13476394A JP H087614 A JPH087614 A JP H087614A
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Prior art keywords
light
light source
conductive plate
guide plate
fluorescent
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JP13476394A
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JP3116727B2 (en
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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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Priority to JP13476394A priority Critical patent/JP3116727B2/en
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Priority claimed from JP2000172502A external-priority patent/JP3417384B2/en
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Publication of JP3116727B2 publication Critical patent/JP3116727B2/en
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Abstract

PURPOSE:To provide a sheet like light source in which a light emitting diode is used and which can be mainly used as back light and can emit white light by arranging a blue light emitting diode, a diffusing layer and a transparent film having a fluorescent material in a specific mode on a transparent light conductive plate. CONSTITUTION:In this sheet-like light source, light emitted from a blue light emitting diode(LED) is partially radiated to an external part except a light conductive plate 2 in the vicinity of the tip, but most light reaches an end surface of the light conductive plate 2 while repeating total reflection in the light conductive plate 2. The light reaching the end surface is reflected by a reflecting film 4 formed on the whole end surface, and repeats total reflection. At this time, the light is diffused by a diffusing layer 3 arranged on the second main surface side of the light conductive plate 2, and a part of the diffused light is absorbed by a fluorescent layer 5, and at the same time, it is radiated after a wave length is converted, and as an emitting light color observed from the first main surface side of the light conductive plate 2, light by synthesizing these light can be observed. For example, in a sheet-like light source having a fluorescent layer composed of an orange fluorescent pigment, an emitting light color from a blue LED 1 can be observed as a white color.

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2の端面の少なくとも一箇所に青色発光ダイオード1が光学的に接続されており、さらに前記導光板2の主面のいずれか一方に白色粉末が塗布された散乱層3(以下、散乱層側の主面を第二の主面という。)を有し、前記散乱層3と反対側の導光板2の主面(以下、第一の主面という。)側には、透明なフィルム6が設置されており、そのフィルム6の表面あるいは内部には前記青色発光ダイオード1の発光により励起されて蛍光を発する蛍光物質が具備されていることを特徴とする。 Means for Solving the Problems] The planar light source of the present invention, a transparent blue light emitting diode 1 in at least one part of the edge surface of the light guide plate 2 are optically connected, further major surface of the light guide plate 2 the main surface of either one scattering layer 3 white powder is applied (hereinafter, the main surface of the scattering layer side. referred to as a second main surface) has, in the scattering layer 3 and the opposite side of the light guide plate 2 fluorescent substance (hereinafter, referred to. the first principal surface) on the side is installed a transparent film 6, the interior or the surface of the film 6 which emits fluorescence by being excited by the emission of the blue light emitting diode 1 wherein the but has been provided.

【0007】図1は本発明の面状光源の導光板2を第二の主面側から見た平面図である。 [0007] Figure 1 is a plan view of the surface light source of the light guide plate 2 of the present invention from the second main surface 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と青色LED1とが光学的に接続されている。 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 and the blue LED1 are optically connected. 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、散乱層3は、白色顔料で光を導光板2内に散乱させている。 [0008] Then, the scattering layer 3 is scatter light into the light guide plate 2 as a white pigment. 特に図1では前記散乱層3をストライプ状とし、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。 In particular, in Figure 1 the scattering layer 3 and a stripe-shaped, so that the surface luminance of the first main surface side is constant, as it approaches the LED1, per unit area of ​​the second main surface side of the scattering layer 3 a pattern as to reduce the 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■は散乱層3のパターンを表している。 Here, in FIG. 1 ■ represents the pattern of the scattering layer 3. 図1では青色LEDを一つの端面に六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、LE Although the six 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, LE
Dの個数も限定するものではない。 Not intended to limit the number of D. 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散乱層3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 scattering layer 3 as a 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7と、例えばAlよりなるベース8とが積層された反射板を設置し、第一の主面側には表面に微細な凹凸が施された透明なフィルム6が設置され、このフィルム6の凹凸が施された表面上には青色LED1の発光により励起されて蛍光を発する蛍光物質が塗布されている。 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 7 made of aluminum oxide, for example, reflection plate and the base 8 are laminated of Al was placed, on the first main surface side fine irregularities is placed a transparent film 6 that is applied to the surface, the surface irregularities of the film 6 is applied by being excited by the emission of blue LED1 a fluorescent substance that emits fluorescence is applied.

【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2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2の端面に達する。 The light emitted from 1, but is radiated to the outside of the 2 other than a portion the light guide plate in the chip near, most of the light while repeating total reflection through the light guide plate 2, reaches the end surface of the light guide plate 2. 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散乱層3により光は散乱され、散乱された光の一部は蛍光層5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, the light by the scattering layer 3 provided on the second main surface side of the light guide plate 2 is scattered, some of the scattered light is absorbed by the fluorescent layer 5 is emitted is wavelength converted at the same time, the light guide plate emission color is observed from the first main surface side of 2 can be observed the light obtained by combining those light. 例えば橙色の蛍光顔料からなる蛍光層5を設けた面状光源では、先に述べた作用により、青色LED1からの発光色が白色となって観測できる。 For example, in the orange fluorescent layer 5 provided with a planar light source comprising a fluorescent pigment, by the action described above, it can be observed the emission color from blue LED1 becomes white.

【0011】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。 [0011] shorter emission wavelength of one blue LED than its main emission peak 500nm, particularly in the present invention, the emission output than 200MyuW, more preferably requires output of more than 300 [mu] W. なぜなら発光波長が500nm This is because the emission wavelength is 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。 Hardly any color achieved when there above, also when the light emission output is less than 200MyuW, even increasing the number of blue LED that even optically connected to the end face of the light guide plate, uniform bright enough planar light emitting light sources, such is because in the resulting less likely.

【0012】また本発明者は特願平5−318267号で、発光観測面と反対側の導光板の主面側に蛍光散乱層を形成することにより、均一な白色発光が可能な面状光源を提案した。 [0012] The present inventors have in Japanese Patent Application No. 5-318267, light emission observing surface side opposite by forming a fluorescent scattering layer on the main surface of the light guide plate, uniform white light can be planar light source It was proposed. しかしこの方法では、得られた面状光源において、色調を変えるには導光板に形成された蛍光散乱層を剥して、再び目的の色調となるような蛍光散乱層を印刷しなければならなかった。 However, in this method, the resultant surface light source, and peeled off fluorescent scattering layer formed on the light guide plate to change the color, we had to print the fluorescent scattering layer, such as again the tone of interest . ところが本発明では、 In the present invention, however,
蛍光層5と散乱層3がそれぞれ独立し、特に色調を決める蛍光層5が着脱可能なフィルム上に形成されているため、蛍光層5が形成されたフィルムを変えるだけで簡単に色調を変化させることができる。 Fluorescent layer 5 and the scattering layer 3 each independently, in particular since the phosphor layer 5 that determines the color tone is formed on a possible film removable, changes the simply by color changing film phosphor layer 5 is formed be able to. また、同時に複数の色を分割発光させることもできる。 It is also possible to multiple the color splitting emitted simultaneously.

【0013】しかもフィルム6の第一の主面側と接する表面には凹凸が施されている為、発光された光を散乱させるのに非常に有用であり、またフィルム6が導光板2 [0013] Moreover since the unevenness can be applied to a surface in contact with the first main surface side of the film 6, is very useful to scatter the emitted light, also the film 6 is the light guide plate 2
に張り付いて干渉縞ができるのを防ぐことができる。 It is possible to prevent the possible interference fringes stuck to.

【0014】 [0014]

【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
に示すストライプ状のパターンで、散乱層3をスクリーン印刷により形成した。 A stripe-shaped pattern shown in, and the scattering layer 3 was formed by screen printing. 散乱層3はチタン酸バリウムよりなる白色物質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。 Scattering layer 3 was formed by printing a material obtained by dispersing a white substance consisting of barium titanate in the acrylic binder.

【0015】上記のようにして散乱層3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、散乱層3が形成された導光板2を得た。 [0015] The acrylic plate scattering layer 3 is formed as described above, was cut according to a desired pattern, after polishing all end surface of the acrylic plate (cut surface), a reflective layer 4 made of Al on the polished surface by forming, to obtain a scattering layer 3 the light guide plate 2 is formed.

【0016】次に、表面に微細な凹凸が施されたフィルム6に蛍光層5を形成した。 Next, fine irregularities on the surface thereof to form a fluorescent layer 5 on the film 6 that has been subjected. 蛍光層5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をアクリル系バインダー中に分散したものを塗布して形成した。 Fluorescent layer 5 is formed by 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 is applied to those dispersed in the acrylic binder did.

【0017】前記導光板2の端面に六箇所、穴を設け、 [0017] six places on the end face of the light guide plate 2, a hole is provided,
その穴に発光波長480nm、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 Emission wavelength 480nm in the hole, a blue LED formed of gallium nitride-based compound semiconductor having an emission output 1200μW
1をそれぞれ1個づつ埋め込んだ。 1 embedded one by one, respectively. 続いて、発光観測面側には上記のように蛍光層5が形成されたフィルム6 Then, the light emission observing surface side fluorescent layer 5 as described above is formed films 6
を、散乱層3側にはAlベース8上にチタン酸バリウム層7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、第一の主面側から完全に面状均一な白色発光が得られた。 And the scattering layer 3 side by installing a reflector barium titanate layer 7 is applied on the Al base 8, was a backlight light source, perfectly planar uniform from the first main surface side white emission was obtained. 輝度は55cd/m 2であった。 Luminance was 55 cd / m 2.

【0018】[実施例2]黄色蛍光染料としてBASF [0018] BASF [Example 2] yellow fluorescent dye
社のLumogenF Yellow−083と橙色蛍光染料として同社製Orenge−240とをほぼ等量混合し、それらとアクリル樹脂をブチルカルビトールアセテートに溶解した蛍光染料を微細な凹凸が施されたフィルム6上に塗布した。 Approximately equal amounts mixed and manufactured by the same company Orenge-240 as a company LumogenF Yellow-083 and orange fluorescent dyes, fluorescent dyes that dissolve them and the acrylic resin in butyl carbitol acetate on the film 6 has been subjected to fine irregularities coated. それ以外は実施例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。 Where otherwise obtain a surface light source of to 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.

【0019】 [0019]

【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、しかも導光板の一方の主面側には白色粉末が塗布された散乱層3を有し、さらにもう一方の主面側には青色LEDにより波長変換できる蛍光物質が塗布された透明なフィルム6を設置することにより、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, a blue LED, moreover on one main surface of the light guide plate has a scattering layer 3 white powder has been applied, still further on one main surface side by placing a transparent film 6 a fluorescent substance is applied which can be wavelength-converted by the blue LED, it becomes possible to realize a surface light source by excellent LED reliability. しかも散乱層3の白色粉末は青色L Moreover white powder scattering layer 3 is blue L
EDの発光を、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。 The emission of ED, reflective, because of the effect of diffusing requires less amount of the fluorescent material used. 更にフィルム6 Furthermore, the film 6
に微細な凹凸を形成することにより、光を散乱させる作用を高め、フィルムが導光板2に張り付いて干渉縞ができるのを防ぐことができる。 By forming fine irregularities on the increase the effect of scattering the light, it is possible to prevent the film can fringe stuck to the light guide plate 2. 更に好都合なことには、L Even more advantageous, L
EDチップと蛍光物質とが直接接することがないので、 Because never in direct contact with the ED chip and a fluorescent substance,
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。 Less deterioration of the fluorescent substance, is not to cause color change of the surface light source for a long period of time. また色調に関しては、蛍光層5の蛍光物質の種類により、白色を含め任意の色調を提供することができ、また蛍光物質はフィルムに具備されている為、フィルムを変えるだけで簡単に面状光源の色調を変化させることができる。 Also with respect to color tone, depending on the type of fluorescent material of the fluorescent layer 5, white can provide any color including, also fluorescent since materials that are provided to the film, simply planar light source by changing the film it is possible to change the color tone.

【0020】一方蛍光層5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され大きな面積の明るい面状光源を実現することができる。 [0020] As one side to excite the fluorescent layer 5, by the emission output of the blue LED used is most preferably a more than 200MyuW, a bright surface light source of a large area is efficiently wavelength-converted by the fluorescent substance it can be realized. このように、本発明の面状光源は、バックライト用光源としてだけでなく、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 invention, 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を散乱層3側から見た平面図。 Figure 1 is a plan view seen from the 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・・・・・散乱層 4・・・・・反射層 5・・・・・蛍光層 6・・・・・フィルム 7・・・・・散乱反射層 8・・・・・Alベース 1 ..... blue LED 2 ----- light guide plate 3 ----- scattering layer 4 ----- reflective layer 5 ..... fluorescent layer 6 ----- film 7 .. ... scattering reflective layer 8 ····· Al base

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 透明な導光板2の端面の少なくとも一箇所に青色発光ダイオード1が光学的に接続されており、 [Claim 1] A blue light emitting diode 1 is optically connected to at least one portion of the end face of the transparent light guide plate 2,
    さらに前記導光板2の主面のいずれか一方に白色粉末が塗布された散乱層3を有し、前記散乱層3と反対側の導光板2の主面側には、透明なフィルム6が設けられており、そのフィルム6の表面あるいは内部には前記青色発光ダイオード1の発光により励起されて蛍光を発する蛍光物質が具備されていることを特徴とする面状光源。 Further, the white powder on one main surface of the light guide plate 2 has a scattering layer 3 is applied, the the main surface of the scattering layer 3 and the opposite side of the light guide plate 2, a transparent film 6 is provided is in and, a planar light source, characterized in that the inside or on the surface of the film 6 is excited by the emission of the blue light emitting diode 1 is a fluorescent substance that emits fluorescence is provided.
  2. 【請求項2】 上記フィルムの導光板と接する表面に微細な凹凸が施されていることを特徴とする請求項1に記載の面状光源。 2. A surface light source according to claim 1, characterized in that fine irregularities on the surface in contact with the light guide plate of the film is applied.
JP13476394A 1994-06-17 1994-06-17 Surface light source Expired - Lifetime JP3116727B2 (en)

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JP2000172502A JP3417384B2 (en) 1994-06-17 2000-06-08 Back light of a liquid crystal display

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