JP2002150821A - Flat light source - Google Patents

Flat light source

Info

Publication number
JP2002150821A
JP2002150821A JP2000338245A JP2000338245A JP2002150821A JP 2002150821 A JP2002150821 A JP 2002150821A JP 2000338245 A JP2000338245 A JP 2000338245A JP 2000338245 A JP2000338245 A JP 2000338245A JP 2002150821 A JP2002150821 A JP 2002150821A
Authority
JP
Japan
Prior art keywords
light
light source
guide plate
spectrum
color
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.)
Pending
Application number
JP2000338245A
Other languages
Japanese (ja)
Inventor
Akira Onikiri
彰 鬼切
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Citizen Electronics Co Ltd
Original Assignee
Citizen Electronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Citizen Electronics Co Ltd filed Critical Citizen Electronics Co Ltd
Priority to JP2000338245A priority Critical patent/JP2002150821A/en
Publication of JP2002150821A publication Critical patent/JP2002150821A/en
Pending legal-status Critical Current

Links

Landscapes

  • Light Guides In General And Applications Therefor (AREA)
  • Planar Illumination Modules (AREA)
  • Led Device Packages (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an edge light type flat light source correcting an inevitable dispersion of spectrum of an LED or the like as a light source, improving a color balance, and irradiating a white light fulfilling a prescribed standard. SOLUTION: For the flat light source 10 comprising a light source 2 and a light guide plate 1, changing the path of the light emitted from the light source by the light guide plate 1, and making a flat illumination light 5 go out from a main surface 1b of the light guide plate to an object to be lighted 7, the light source 2 emits the light with a luminous color composed of a plurality of wave length components, and the light guide plate 1 is made of a translucent material having a color of complementary spectrum against the spectrum of the light source, and the spectrum of the light of the light source is compensated into a desired spectrum by the light guide plate 1, and made to irradiate as the illumination light 5.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、透過型又は半透
過型パネルを背面より照射するバックライト機構を有す
る表示装置の面状光源に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar light source for a display device having a backlight mechanism for illuminating a transmissive or transflective panel from the back.

【0002】[0002]

【従来の技術】近年、ブック型のワードプロセッサやコ
ンピュータ、又は携帯電話機、携帯TVのような小型、薄
型の情報機器の表示装置として、薄型でしかも見易いバ
ックライト機構を有する液晶表示装置が用いられてい
る。このようなバックライト機構としては、液晶パネル
を背後から全面にわたり照射する面状光源が用いられて
おり、この面状光源としては蛍光ランプ又はLED(発
光ダイオード)よりなる発光源と、その光束を液晶パネ
ルに照射する面状の光束に変換する導光板よりなるもの
が一般的である。この中で、特に近年は、更なる小型、
薄型化と長寿命化を目的として発光源としてLEDを用
いた面状光源が多く使用されるようになってきている。
2. Description of the Related Art In recent years, a liquid crystal display device having a thin and easy-to-see backlight mechanism has been used as a display device of a small and thin information device such as a book-type word processor or a computer, or a portable telephone or a portable TV. I have. As such a backlight mechanism, a planar light source that irradiates the liquid crystal panel from behind to the entire surface is used. As the planar light source, a light emitting source composed of a fluorescent lamp or an LED (light emitting diode) and a light flux of the light source are used. Generally, a light guide plate that converts the light into a planar light beam to be irradiated on a liquid crystal panel is used. Among them, especially in recent years, further miniaturization,
A planar light source using an LED as a light emitting source has been increasingly used for the purpose of reducing the thickness and extending the service life.

【0003】かかる面状光源により白色の照明光を出射
させ、パネル等に対し白色の照明をしようとするとき
は、発光源として白色の蛍光ランプを用いるか、LED
の場合にはR,G,Bの3種類のLEDを同時点灯、又
は時分割点灯して白色光を合成することが一般的であっ
た。更に最近は、LEDの場合、単独で白色に近い光を
発光する白色のLEDが開発され、利用できるようにな
ってきた。このような白色のLEDを用いることによ
り、小型で簡単な構成で白色照明を目的とする面状光源
を形成することが可能となった。図11はこのようなう
な単独のLEDの発光源を持ち、パネルの白色照明を目
的としたエッジライト方式の面状光源の主要部を示す図
であり、(a)は斜視図、(b)におけるA−A断面図
である。
When white light is emitted by such a planar light source and a panel or the like is to be illuminated with white light, a white fluorescent lamp is used as a light emitting source, or an LED is used.
In the case of (3), it is common to combine three types of LEDs, R, G, and B, simultaneously or in a time-division manner to synthesize white light. More recently, in the case of LEDs, white LEDs that independently emit light close to white have been developed and become available. By using such white LEDs, it is possible to form a planar light source for white illumination with a small and simple configuration. FIG. 11 is a diagram showing a main part of an edge light type planar light source having such a single LED light emitting source for the purpose of white illumination of a panel, wherein (a) is a perspective view and (b). It is AA sectional drawing in.

【0004】図11において、110は面状光源であ
り、導光板101と発光源としてLED102を有して
いる。導光板101は無色透明なプラスチック材等の透
光部材よりなる板状で略直方体形状をしており、その一
方の主面を光出射面101bとし、該光出射面101b
と対向する面には、発光源からの光を前記光出射面10
1bに向けて反射させるための手段として、その表面に
複数の微小なシボ又は複数個の半球状ドット等を有する
光拡散面101aが形成されている。LED102はL
ED基板103に支持されて導光板101の側面に対向
する位置に配設され、図示しない駆動回路より所定の電
流が供給されて、後述するような白色を目的とした光を
発光、射出する。LED102からの射出光は導光板1
01に入り、大部分の光は上面である光出射面101b
で全反射、下面である光拡散面101aでは全反射又は
乱反射を1回又は複数回行った後に上面である光出射面
101bより照明光105として外部に出射する。外部
に出射した照明光105は(b)に示すように液晶パネ
ル107を背後から照明する。なお、前記照明する面内
の輝度の均一性を確保するために上記下面101a内の
シボの粗さを調整したり、半球状ドットの形状、密度を
場所により変えたりする。
In FIG. 11, reference numeral 110 denotes a planar light source, which has a light guide plate 101 and an LED 102 as a light source. The light guide plate 101 is a plate made of a transparent member such as a colorless and transparent plastic material and has a substantially rectangular parallelepiped shape. One main surface of the light guide plate 101 is a light exit surface 101b.
The light from the light emitting source is placed on the surface facing the light emitting surface 10.
As a means for reflecting light toward 1b, a light diffusing surface 101a having a plurality of minute grains or a plurality of hemispherical dots is formed on the surface thereof. LED102 is L
The light guide plate 101 is supported by the ED substrate 103 and is disposed at a position facing the side surface of the light guide plate 101. A predetermined current is supplied from a drive circuit (not shown) to emit and emit light for white as described later. The light emitted from the LED 102 is the light guide plate 1
01, most of the light is emitted from the light emitting surface 101b which is the upper surface.
After performing total reflection or irregular reflection once or plural times on the light diffusion surface 101a as the lower surface, the light is emitted to the outside as illumination light 105 from the light emission surface 101b as the upper surface. The illumination light 105 emitted to the outside illuminates the liquid crystal panel 107 from behind as shown in FIG. In addition, in order to ensure the uniformity of the luminance in the surface to be illuminated, the roughness of the grain in the lower surface 101a is adjusted, and the shape and density of the hemispherical dot are changed depending on the location.

【0005】[0005]

【発明が解決しようとする課題】このようにして、小
型、薄型の面状光源により白色照明を目的とした液晶パ
ネルの照明がなされる。しかしながら、上記の面状光源
においては、以下に述べるような問題点がある。図12
はLED102の発光のスペクトルを示す図であり、
(a)は通常の白色光源と認められるもののスペクトル
H1を示し、(b)は青みがかった白色光源のスペクト
ルH2を示す。ここで、横軸は波長を示し、625nm
の前後がRの領域、560nmの前後がGの領域、45
0nmの近傍がBの領域である。縦軸はスペクトルの相
対強度を示す。
In this manner, the liquid crystal panel is illuminated for white illumination by the small and thin planar light source. However, the above-mentioned planar light source has the following problems. FIG.
Is a diagram showing a spectrum of light emission of the LED 102,
(A) shows the spectrum H1 of a normal white light source, and (b) shows the spectrum H2 of a bluish white light source. Here, the horizontal axis indicates the wavelength, 625 nm
Is a region of R before and after, a region of G is around 560 nm, 45
The area near 0 nm is the area of B. The vertical axis indicates the relative intensity of the spectrum.

【0006】図13はLED102のような白色を目的
としたLEDの発光の色度を示すCIE色度図である。
ここで、xはRの割合を、yはGの割合を示す。そし
て、図には示していないが、zをBの割合としたとき、
常に x+y+z=1・・・・(1) の関係があるとしている。C0はR,G,Bの成分比が
1:1:1である色度の点を示し、この場合,座標は略
x=0.33,y=0.33,(z=0.33)となっ
ている。C0の近傍においてその周りを囲んだ破線の内
側の領域Sの範囲は通常の白色と認められる色度を有
し、図11(a)のスペクトル分布H1の場合の色度は
この領域に含まれる。白色を目的としたLEDはその発
光の色度が前記の領域Rに入ることを目標に製造される
のであるが、実際の製品はその特性がばらつき、発光の
色度が領域Sからかなり外れることが少なくない。
FIG. 13 is a CIE chromaticity diagram showing the chromaticity of light emission of an LED for white light such as the LED 102.
Here, x indicates the ratio of R, and y indicates the ratio of G. Then, although not shown in the figure, when z is a ratio of B,
It is assumed that there is always a relationship of x + y + z = 1 (1). C0 indicates a chromaticity point at which the R, G, B component ratio is 1: 1: 1. In this case, the coordinates are approximately x = 0.33, y = 0.33, (z = 0.33). It has become. The range of the region S inside the broken line surrounding the vicinity of C0 has chromaticity recognized as normal white, and the chromaticity in the case of the spectrum distribution H1 of FIG. 11A is included in this region. . The LED for white color is manufactured with the aim that the chromaticity of light emission falls within the above-mentioned region R. However, the characteristics of actual products vary, and the chromaticity of light emission deviates considerably from the region S. Not a few.

【0007】図12(b)に示すスペクトルH2を生ず
るLEDの場合その一例であり、この場合は、R、Gに
比較してBの成分がかなり大きいので、(1)式からも
わかるように、x、yがともに減少し、色度を示す点は
領域Sから図上で左下側にずれ、点C2の位置となって
いる。この位置の色度においては、通常の白色とは認め
られず、青みがかった白色として認識される。ところ
で、照明光105は図10に示すように、LED102
の発光が無色透明の導光板101を透過して生ずるの
で、照明光105のスペクトルはLED102の発光の
スペクトルと同じになる。従って、前記スペクトルH2
を生ずるLEDの場合は照明光のスペクトルもH2と同
じとなり、照明光は通常の白色光とならず、青みがかっ
た白色光となる。よって、この場合は通常の白色の照明
を目的とする面状光源110の目的を達成することはで
きず、パネル107に関し期待された表示の品位を満足
することができない。
This is an example of the case of an LED that produces the spectrum H2 shown in FIG. 12B. In this case, the B component is considerably larger than the R and G components. , X, and y decrease, and the point indicating the chromaticity is shifted from the area S to the lower left side in the figure, and is located at the point C2. The chromaticity at this position is not recognized as normal white, but is recognized as bluish white. By the way, as shown in FIG.
Is generated through the colorless and transparent light guide plate 101, so that the spectrum of the illumination light 105 is the same as the spectrum of the light emitted by the LED 102. Therefore, the spectrum H2
In the case of the LED that produces the above, the spectrum of the illumination light is also the same as H2, and the illumination light does not become normal white light but becomes bluish white light. Therefore, in this case, the purpose of the planar light source 110 for normal white illumination cannot be achieved, and the display quality expected for the panel 107 cannot be satisfied.

【0008】上記のように、LED等の発光源と導光板
を有する簡単な構成のエッジライト方式の面状光源にお
いて、導光板から射出する照明光の波長成分のスペクト
ルが、発光源のスペクトルにより決められてしまう。発
光源として白色を目的としたLED等を使用した場合、
その特性の不可避なばらつきにより、発光源の発光は
R,G,Bの色バランスがくずれ、所望のとおりの通常
の白色光からずれたスペクトルを有するものとなること
が多く、そのスペクトルがそのまま照明光のスペクトル
となるため、照明光には白色以外の色が若干混じり、所
望の白色光の照明を得ることができない場合が少なくな
い。そこで、本発明は、白色照明を目的とした上記面状
光源の照明光におけるかかる色バランスのくずれを改善
することを課題とするものである。この発明の前記なら
びにそのほかの目的と新規の特徴は本明細書の記述およ
び添付図面から明らかになるであろう。
As described above, in an edge light type planar light source having a simple configuration including a light emitting source such as an LED and a light guide plate, the spectrum of the wavelength component of the illumination light emitted from the light guide plate depends on the spectrum of the light source. It will be decided. When an LED or the like for white light is used as a light source,
Due to the unavoidable variation in the characteristics, the light emission of the light emitting source often loses the color balance of R, G, and B, and has a spectrum shifted from desired normal white light, and the spectrum is illuminated as it is. Since the light spectrum is used, colors other than white are slightly mixed in the illumination light, and it is not often the case that desired white light illumination cannot be obtained. Therefore, an object of the present invention is to improve the color balance of the illumination light of the planar light source for white illumination. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

【0009】[0009]

【課題を解決するための手段】上記の課題を解決するた
めにその第1の手段として本発明は、発光光源および導
光板を有し、発光光源からの光を導光板により光路変換
してその主面から照明対象物に対し面状の照明光を出射
する面状光源において、前記発光光源は複数の波長成分
よりなる発光色で発光し、該面状光源は、光のスペクト
ルを補正する色補正部品を備え、該色補正部品により前
記発光光源の発光のスペクトルを所望のスペクトルに補
正して前記面状の照明光として出射することを特徴とす
る。
The present invention as a first means for solving the above-mentioned problems has a light-emitting light source and a light guide plate, and converts the light from the light-emitting light source into an optical path by the light guide plate. In a planar light source that emits planar illumination light from a main surface to an object to be illuminated, the light-emitting light source emits light of a color that includes a plurality of wavelength components, and the planar light source is a color that corrects the spectrum of light. The color correction component corrects the emission spectrum of the light emitting light source to a desired spectrum and emits the light as the planar illumination light.

【0010】上記の課題を解決するためにその第2の手
段として本発明は、前記第1の手段において、前記色補
正部品の透光特性の色調は前記発光光源の発光色の色調
に対し略補色関係にあることを特徴とする。
According to a second aspect of the present invention, in the first aspect, the color tone of the color correction component is substantially equal to the color tone of the light emission color of the light emitting light source. It has a complementary color relationship.

【0011】上記の課題を解決するためにその第3の手
段として本発明は、前記第1の手段又は第2の手段にお
いて、前記色補正部品は着色された半透明材よりなる前
記導光板であることを特徴とする。
According to a third aspect of the present invention, there is provided the light emitting device according to the first or second aspect, wherein the color correction component is a light guide plate made of a colored translucent material. There is a feature.

【0012】上記の課題を解決するためにその第4の手
段として本発明は、前記第1の手段又は第2の手段にお
いて、前記色補正部品は着色された半透明材よりなる前
記導光板であることを特徴とする。
According to a fourth aspect of the present invention, there is provided the light emitting device according to the first or second aspect, wherein the color correction component is a light guide plate made of a colored translucent material. There is a feature.

【0013】上記の課題を解決するためにその第5の手
段として本発明は、前記第1の手段又は第2の手段にお
いて、前記色補正部品は透明材よりなる前記導光板と前
記照明対象物の間に配設されたカラーフィルタであるこ
とを特徴とする。
According to a fifth aspect of the present invention, in order to solve the above-mentioned problems, in the first or the second means, the color correction component may be a light guide plate made of a transparent material and the illumination object. And a color filter disposed between the two.

【0014】上記の課題を解決するためにその第6の手
段として本発明は、前記第1の手段乃至第5の手段のい
ずれかにおいて、前記発光光源は白色光源又は白色に近
い光源であることを特徴とする。
According to a sixth aspect of the present invention, in order to solve the above-mentioned problem, the present invention is characterized in that in any one of the first to fifth means, the light emitting light source is a white light source or a light source close to white. It is characterized by.

【0015】[0015]

【発明の実施の形態】以下に、図面に基づいて本発明の
第1の実施の形態に係る面状光源について説明する。図
1は本実施の形態に係るエッジライト方式の面状光源の
構成を示す図であり、(a)は斜視図、(b)は(a)
のA−A断面図である。図1において、10は面状光源
であり、導光板1と発光源としてLED2を有してい
る。導光板1は後述する色に着色された半透明なプラス
チック材等よりなり、板状で略直方体形状をしており、
その一方の主面を光出射面1bとし、該光出射面1bと
対向する面には、発光源からの光を前記光出射面1bに
向けて光を反射させるための手段として、その表面に複
数の微小なシボ又は複数個の半球状ドット等を有する光
拡散面1aが形成されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a planar light source according to a first embodiment of the present invention will be described with reference to the drawings. 1A and 1B are diagrams showing a configuration of an edge light type planar light source according to the present embodiment, wherein FIG. 1A is a perspective view, and FIG.
It is AA sectional drawing of. In FIG. 1, reference numeral 10 denotes a planar light source, which includes a light guide plate 1 and an LED 2 as a light source. The light guide plate 1 is made of a translucent plastic material or the like colored in a color described later, has a plate-like shape, and has a substantially rectangular parallelepiped shape.
One of the main surfaces is a light emitting surface 1b, and a surface facing the light emitting surface 1b is provided with a means for reflecting light from a light emitting source toward the light emitting surface 1b. A light diffusing surface 1a having a plurality of minute grain or a plurality of hemispherical dots is formed.

【0016】LED2はLED基板3に支持されて導光
板1の側面に対向する位置に配設され、図示しない駆動
回路より所定の電流が供給されて、後述するような白色
を目的とした光を発光、射出する。LED2からの射出
光は導光板1に入り、大部分の光は上面である光出射面
1bで全反射、下面である光拡散面1aでは全反射又は
乱反射を1回又は複数回行った後に上面である光出射面
1bより外部に出射する。外部に出射した光は照明光5
として液晶パネル7を背後より照明する。なお、前記照
明する面内の輝度の均一性を確保するために上記下面内
のシボの粗さを調整したり、半球状ドットの形状、密度
を場所により変えたりする。
The LED 2 is supported by the LED board 3 and is disposed at a position facing the side surface of the light guide plate 1. A predetermined current is supplied from a drive circuit (not shown) to emit light for white as described later. Emit and emit. The light emitted from the LED 2 enters the light guide plate 1, and most of the light is totally reflected on the light emitting surface 1b, which is the upper surface, and once or more than once, on the light diffusing surface 1a, which is the lower surface. From the light exit surface 1b. Light emitted to the outside is illumination light 5
The liquid crystal panel 7 is illuminated from behind. In addition, in order to ensure the uniformity of the luminance in the surface to be illuminated, the roughness of the grain in the lower surface is adjusted, and the shape and density of the hemispherical dot are changed depending on the location.

【0017】次に図2は前記導光板1の着色のスペクト
ルH11を示す図であり、図3は前記LED2の発光の
スペクトルH2および前記照明光5のスペクトルH21
を示す図であり、図4は前記LED2の発光および照明
光5等の色度を示すCIE色度である。図3の実線に示
すように本実施の形態のLED2の発光のスペクトル分
布はH2は従来例においてすでに説明した図11(b)
のH2に示すLED102の発光のスペクトルと同一の
スペクトルとなっている。そして、LED2の発光の図
4のCIE色度図における座標の位置C2は従来例にお
いてすでに説明した図12に示すC2の位置と同じであ
り、目標領域Sから左下方にずれている。図3のH2お
よび図4のC2に示すように、本実施の形態におけるL
ED2の発光のR、G、Bのバランスは十分ではなく青
みがかった白色の発光をする。しかし、本実施の形態に
おいては、図10に示す従来例のような無色透明の導光
板(101)ではなく、導光板1として図2のH11に
示すような白っぽい黄色に着色された半透明な部材(プ
ラスチック等)を用いている。
FIG. 2 is a diagram showing a coloring spectrum H11 of the light guide plate 1, and FIG. 3 is a diagram showing a spectrum H2 of the light emission of the LED 2 and a spectrum H21 of the illumination light 5.
FIG. 4 is a CIE chromaticity showing the chromaticity of the light emission of the LED 2 and the illumination light 5 and the like. As shown by the solid line in FIG. 3, the light emission spectrum distribution of the LED 2 of the present embodiment is H2 in FIG.
H2 has the same spectrum as the emission spectrum of the LED 102 shown in H2. Then, the position C2 of the coordinates of the light emission of the LED 2 in the CIE chromaticity diagram of FIG. 4 is the same as the position C2 shown in FIG. As shown in H2 in FIG. 3 and C2 in FIG.
The balance of R, G, and B of the light emission of the ED2 is not sufficient, and the ED2 emits bluish white light. However, in the present embodiment, instead of the colorless and transparent light guide plate (101) as in the conventional example shown in FIG. 10, the light guide plate 1 is a translucent colored yellowish white as shown by H11 in FIG. A member (such as plastic) is used.

【0018】導光板1の前記スペクトルH11は450
nm付近のB成分よりも600nm前後のY(イエロ
ー)成分(又は625nm付近のR成分および560n
m付近のG成分)が高くなっている。このため、光のB
成分の透過率がY成分は透過率を下回ることになり、図
3のH2に示すLED2の発光のスペクトルは、導光板
1を透過することにより、そのフィルター作用により、
B成分が低減されてH21に示すスペクトルに補正され
た照明光5として出射する。かかるフィルター作用を一
般的に述べるならば、R、G、Bの比率がr1:g1:
b1である入射光が着色のR、G、Bの比率がr2:g
2:b2bであるフィルターを透過した場合、出射光に
おけるR、G、Bの比率は減法混色の原理により R:G:B=r1×r2:g1×g2:b1×b2・・・・(2) となる。本例の場合はフィルターの r2:g2:b2
は図2のH11に示すように略 1:1:0.8 と
なっているので出射光(図3のH21に対応)おける
R、G、Bの比率は(2)式より R:B:G=r1:g1:0.8×b1 となり、H21に示すように入射光(H2に対応)と比
較してR、Gの成分は変わらず、Bの成分のみが減少し
ている。
The spectrum H11 of the light guide plate 1 is 450
The Y (yellow) component around 600 nm (or the R component around 625 nm and 560n) than the B component around nm.
G component near m) is high. Therefore, the light B
The transmittance of the component is lower than the transmittance of the Y component, and the emission spectrum of the LED 2 indicated by H2 in FIG.
The illumination light 5 is emitted as the illumination light 5 whose B component has been reduced and corrected to the spectrum indicated by H21. Generally speaking, such a filter action is such that the ratio of R, G, B is r1: g1:
The ratio of R, G, and B in which the incident light b1 is colored is r2: g.
When the light passes through the filter of 2: b2b, the ratio of R, G, and B in the emitted light is calculated according to the principle of subtractive color mixing: R: G: B = r1 × r2: g1 × g2: b1 × b2 (2) ). In the case of this example, r2: g2: b2 of the filter
Is approximately 1: 1: 0.8 as shown by H11 in FIG. 2, the ratio of R, G, and B in the emitted light (corresponding to H21 in FIG. 3) is obtained from the equation (2) as follows: G = r1: g1: 0.8 × b1, and as shown at H21, the R and G components remain unchanged and only the B component decreases as compared to the incident light (corresponding to H2).

【0019】このようにして照明光5のスペクトルH2
1においてはR、G、Bのバランスが改善されその色度
図上の位置は前記のC2から、通常の白色と認められる
領域S内の点C21に移動する。C21は図上ではC2か
ら見て右上の方向にあるが、これはB成分の減少によ
り、右上方向に移動したものである。一方、導光板1の
着色のR、G、Bの上記した成分比(1:1:0.8)
から、式(1)により求めた色度図上の位置は、図4の
C11となる。この点は色バランスの良好な点C21か
ら更に右上の方向に移動した位置となる。すなわち、L
ED2の発光の色の成分比とフィルターとしての導光板
1の着色の色の成分比は略反対となっており、互いに補
色関係にあると言える。特にBの成分比については完全
に反対となっている。このように、本実施の形態におい
ては、青みがかった白色のLED2の発光に対し、フィ
ルターの作用をなす半透明の導光板1の着色を前記発光
の色と補色関係にある白みがっかた黄色とすることによ
り、色バランスが補正改善され、通常の白色光と認めら
れる照明光5を発することができる。
Thus, the spectrum H2 of the illumination light 5 is obtained.
In 1, the balance of R, G, and B is improved, and the position on the chromaticity diagram moves from C2 to point C21 in the area S recognized as normal white. C21 is in the upper right direction as viewed from C2 in the figure, but has moved in the upper right direction due to the decrease of the B component. On the other hand, the above-mentioned component ratio of R, G, and B of the color of the light guide plate 1 (1: 1: 0.8)
Therefore, the position on the chromaticity diagram obtained by Expression (1) is C11 in FIG. This point is a position further moved to the upper right from the point C21 having a good color balance. That is, L
The component ratio of the light emission color of the ED 2 and the component ratio of the coloring color of the light guide plate 1 as a filter are substantially opposite, and it can be said that they have a complementary color relationship with each other. In particular, the component ratio of B is completely opposite. As described above, in the present embodiment, the color of the translucent light guide plate 1 serving as a filter is used for the light emission of the bluish-white LED 2, which has a complementary color relationship with the color of the light emission. By making the color yellow, the color balance is corrected and improved, and the illumination light 5 recognized as normal white light can be emitted.

【0020】以下に図面を参照して本発明の第2の実施
の形態に係る面状光源につき説明する。本実施の形態は
図1に示す第1の実施の形態と形状的な構成およびLE
D2の発光のスペクトルは同様であり、導光板1の着色
のスペクトルのみが異なる。ここで、図5は本実施の形
態に係る導光板1の着色のスペクトルH12を示す図で
あり、図6はLED2の発光のスペクトル特性H2およ
び照明光5のスペクトルH22を示す図である。図6に
示すようにLED2の発光のスペクトルH2は図3に示
すLED2の発光のスペクトルH2同じであるが、図5
に示す導光板の着色のスペクトルH12は図2に示す第
1の実施例における導光板の着色のスペクトル特性H1
1と比較するとGの成分よりもRの成分が大となってお
り、赤みがかった黄色となっている。
A planar light source according to a second embodiment of the present invention will be described below with reference to the drawings. This embodiment is different from the first embodiment shown in FIG.
The emission spectrum of D2 is the same, and only the coloring spectrum of the light guide plate 1 is different. Here, FIG. 5 is a diagram illustrating a coloring spectrum H12 of the light guide plate 1 according to the present embodiment, and FIG. 6 is a diagram illustrating a spectrum characteristic H2 of light emission of the LED 2 and a spectrum H22 of the illumination light 5. As shown in FIG. 6, the emission spectrum H2 of LED2 is the same as the emission spectrum H2 of LED2 shown in FIG.
2 shows the coloring spectrum H12 of the light guide plate in the first embodiment shown in FIG.
Compared to 1, the component of R is larger than the component of G, and the color is reddish yellow.

【0021】すなわち、本実施の形態においては、導光
板1におけるR、G、Bの比率r2、g2、b2につい
ては、r2>g2>b2 の関係がある。そして、LE
D2の発光の成分比r1、g1、b1については図6の
H2に示すように r1<g1<b1 の関係がある。
すなわち、色バランスのずれの性質がR、G、Bのすべ
てについて導光板のスペクトルH12とLEDのスペク
トルH2とでは逆となっており、略完全な補色関係にあ
る。LED2の発光は導光板1を透過することにより、
(2)式に示す減法混色の原理により補正され、R、
G、Bの比率が略1:1:1である照明光5となる。こ
こで照明光5は略完全な白色でありその色度は、図4の
色度図においてはC0に略一致する。このように本実施
の形態においては、LEDの発光と略完全な補色関係に
あるスペクトル特性を有する導光板を用いることによ
り、略完全な白色の照明光を得ることができる。
That is, in the present embodiment, the ratios r2, g2, and b2 of R, G, and B in the light guide plate 1 have a relationship of r2>g2> b2. And LE
The component ratios r1, g1, and b1 of the light emission of D2 have a relationship of r1 <g1 <b1 as shown by H2 in FIG.
In other words, the nature of the color balance shift is opposite between the spectrum H12 of the light guide plate and the spectrum H2 of the LED for all of R, G, and B, and has a substantially perfect complementary color relationship. The light emission of the LED 2 is transmitted through the light guide plate 1,
Corrected according to the principle of subtractive color mixture shown in equation (2), R,
The illumination light 5 has a ratio of G and B of approximately 1: 1: 1. Here, the illumination light 5 is almost completely white, and its chromaticity substantially matches C0 in the chromaticity diagram of FIG. As described above, in the present embodiment, a substantially perfect white illumination light can be obtained by using a light guide plate having a spectral characteristic that is substantially completely complementary to the emission of the LED.

【0022】以下に本発明の第3の実施の形態に係る面
状光源につき図面を参照して説明する。本実施の形態は
図1に示す第1の実施の形態と形状的な構成は同様であ
るが、LED2の発光のスペクトルおよび導光板1の着
色のスペクトルが異なる。ここで、図7は本実施の形態
に係る導光板1の着色のスペクトル特性H13を示す図
であり、図8はLED2の発光のスペクトル特性H3お
よび照明光5のスペクトル特性H23を示す図である。
図8のH3に示すように本実施の形態の発光源であるL
ED2の発光はGの成分とBの成分を有し、C(シヤン)
の色調となっている。ここで、本実施の形態は、かかる
発光源2の発光からGの色の照明光5を得ることを目的
とする。そこで、図7に示すように本実施の形態の導光
板1の着色のスペクトルH13はRとGの範囲で高くな
っており、導光板1はY(イエロー)に着色された状態
となっている。これにより、Cの色調の発光はこれと補
色関係にあるYの色調の導光板を透過することにより、
すでに説明した減法混色の原理により、色の補正がなさ
れ、図8のH23のスペクトルに示すように所望の色で
あるGの色の照明光5を得ることができる。このよう
に、本発明によれば、着色された導光板を用いることに
より、複数の波長成分を有する発光源から白色に限らず
発光源の成分に含まれる所望の色の照明光を得ることが
できる。
Hereinafter, a planar light source according to a third embodiment of the present invention will be described with reference to the drawings. This embodiment has the same shape and configuration as the first embodiment shown in FIG. 1, but differs in the emission spectrum of the LED 2 and the coloring spectrum of the light guide plate 1. Here, FIG. 7 is a diagram showing a spectral characteristic H13 of coloring of the light guide plate 1 according to the present embodiment, and FIG. 8 is a diagram showing a spectral characteristic H3 of light emission of the LED 2 and a spectral characteristic H23 of the illumination light 5. .
As shown by H3 in FIG. 8, the light source L of the present embodiment is
The emission of ED2 has a G component and a B component,
Color tone. Here, the present embodiment aims to obtain the illumination light 5 of G color from the light emission of the light emission source 2. Therefore, as shown in FIG. 7, the coloring spectrum H13 of the light guide plate 1 of the present embodiment is higher in the range of R and G, and the light guide plate 1 is in a state of being colored Y (yellow). . Thereby, the light emission of the color tone of C is transmitted through the light guide plate of the color tone of Y, which is a complementary color relationship with the light emission of C,
According to the principle of subtractive color mixing already described, color correction is performed, and as shown in the spectrum of H23 in FIG. 8, the illumination light 5 of the desired color G can be obtained. As described above, according to the present invention, by using a colored light guide plate, it is possible to obtain illumination light of a desired color contained in a component of a light emitting source as well as white from a light emitting source having a plurality of wavelength components. it can.

【0023】以下に図面に基づいて本発明の第4の実施
の形態および第5の実施の形態に係る面状光源につき説
明する。図9は本発明の第4の実施の形態を示す断面図
である。図9において、4は薄板状又は膜状のカラーフ
ィルターであり、発光源であるLED2のスペクトルと
略補色関係にあるスペクトルの色に着色された半透明な
材料よりなる。導光板1は図1に示したものと形状的に
は同様であるが、着色はされておらず、無色透明な材料
よりなる。前記カラーフィルター4は導光板1と照明対
象物である液晶パネル7の間に配置される。本例では便
宜上カラーフィルター4を導光板1に密着させている
が、かならずしも密着させる必要はない。本実施の形態
においては、導光板1に入射したLED2の発光はここ
で、すでに説明した原理により光路変換されるが、この
間に色補正は行われない。光路変換された光はカラーフ
ィルター4に入射しここで、第1、第2、第3の実施の
形態においてすでに説明したのと同様の原理により色補
正が行われ、フィルター板4から白色をはじめ所望の色
の照明光5が出射する。
Hereinafter, a planar light source according to a fourth embodiment and a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a sectional view showing a fourth embodiment of the present invention. In FIG. 9, reference numeral 4 denotes a thin plate or film color filter, which is made of a translucent material colored in a spectrum having a color complementary to the spectrum of the LED 2 serving as a light emitting source. The light guide plate 1 is similar in shape to that shown in FIG. 1, but is not colored and is made of a colorless and transparent material. The color filter 4 is disposed between the light guide plate 1 and a liquid crystal panel 7 which is an object to be illuminated. In this example, the color filter 4 is closely attached to the light guide plate 1 for convenience, but it is not always necessary to closely adhere. In the present embodiment, the light emission of the LED 2 incident on the light guide plate 1 is converted into an optical path according to the principle described above, but no color correction is performed during this time. The light whose path has been changed enters the color filter 4, where the color correction is performed according to the same principle as already described in the first, second and third embodiments. The illumination light 5 of a desired color is emitted.

【0024】図10は本発明の第5の実施の形態を示す
断面図である。図10において、4は薄板状又は膜状の
カラーフィルターあり、発光源であるLED2のスペク
トルと略補色関係にあるスペクトルの色に着色された半
透明な材料よりなる。導光板1は図1に示したものと形
状的には同様であるが、着色はされておらず、無色透明
な材料よりなる。前記カラーフィルター4は導光板1と
LED2の間に配置される。本例では便宜上カラーフィ
ルター4を導光板1に密着させているが、かならずしも
密着させる必要はない。本実施の形態においてはLED
2の発光はまずカラーフィルター4に入射し、ここで、
第1、第2、第3の実施の形態においてすでに説明した
のと同様の原理により色補正が行われ所望の色の光とな
って導光板1に入射し、光路変換されて、導光板1から
所望の色の照明光が出射する。このように、上記の第4
の実施の形態および第5の実施の形態においては、色の
フィルター部材として導光板とは別個のカラーフィルタ
ーを用いているが、発光源であるLEDの発光のスペク
トルが種種ばらつく場合には、これを補正するフィルタ
部材の着色も様々なものを準備しておく必要があるの
で、専用のカラーフィルターを用いることにより、部品
点数は増えるが、対応が容易になるという利点がある。
FIG. 10 is a sectional view showing a fifth embodiment of the present invention. In FIG. 10, reference numeral 4 denotes a thin-plate or film-like color filter, which is made of a translucent material colored in a spectrum having a color complementary to the spectrum of the LED 2 as a light emitting source. The light guide plate 1 is similar in shape to that shown in FIG. 1, but is not colored and is made of a colorless and transparent material. The color filter 4 is disposed between the light guide plate 1 and the LED 2. In this example, the color filter 4 is closely attached to the light guide plate 1 for convenience, but it is not always necessary to closely adhere. In the present embodiment, the LED
The light emission of 2 first enters the color filter 4, where
According to the same principle as described in the first, second, and third embodiments, color correction is performed, light of a desired color is incident on the light guide plate 1, the light path is changed, and the light guide plate 1 is changed. Emits illumination light of a desired color. Thus, the fourth
In the fifth embodiment and the fifth embodiment, a color filter separate from the light guide plate is used as a color filter member. However, when the emission spectrum of the LED as the light emission source varies, Since it is necessary to prepare various colors for the filter member for correcting the color difference, the use of a dedicated color filter increases the number of components, but has an advantage that it can be easily handled.

【0025】[0025]

【発明の効果】以上に説明したように、本発明によれば
LED等の発光源と導光板を有する簡単な構成のエッジ
ライト方式の面状光源において、着色した導光板等のフ
ィルター手段を用いることにより、発光源のスペクトル
を補正して白色等の所望の色の照明光を出射させること
ができる。これにより、LED等の製品のスペクトル特
性の不可避なばらつきにより、所望とする白色等の発光
が得られない場合でも、フィルター手段により発光源の
色バランスを補正して所望の色の照明光を得ることが可
能となった。
As described above, according to the present invention, a filter means such as a colored light guide plate is used in a simple configuration of an edge light type planar light source having a light source such as an LED and a light guide plate. Thereby, the illumination light of a desired color such as white can be emitted by correcting the spectrum of the light emitting source. Accordingly, even when the desired white light emission or the like cannot be obtained due to inevitable variations in the spectral characteristics of products such as LEDs, the color balance of the light emission source is corrected by the filter means to obtain illumination light of a desired color. It became possible.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の第1の実施の形態に係る面状光源の構
成を示す図である。
FIG. 1 is a diagram showing a configuration of a planar light source according to a first embodiment of the present invention.

【図2】図1に示す面状光源における導光板の着色のス
ペクトルを示す図である。
FIG. 2 is a diagram showing a spectrum of coloring of a light guide plate in the planar light source shown in FIG.

【図3】図1に示す面状光源における発光源のスペクト
ルおよび照明光のスペクトルを示す図である。
FIG. 3 is a diagram showing a spectrum of a light emitting source and a spectrum of illumination light in the planar light source shown in FIG.

【図4】図1に示す面状光源における発光源の色度およ
び照明光の色度等を示す図である。
FIG. 4 is a diagram showing chromaticity of a light emitting source, chromaticity of illumination light, and the like in the planar light source shown in FIG.

【図5】本発明の第2の実施の形態に係る面状光源にお
ける導光板の着色のスペクトルを示す図である。
FIG. 5 is a diagram showing a spectrum of coloring of a light guide plate in a planar light source according to a second embodiment of the present invention.

【図6】本発明の第2の実施の形態に係る面状光源にお
ける発光源のスペクトルおよび照明光のスペクトルを示
す図である。
FIG. 6 is a diagram showing a spectrum of a light source and a spectrum of illumination light in a planar light source according to a second embodiment of the present invention.

【図7】本発明の第3の実施の形態に係る面状光源にお
ける導光板の着色のスペクトルを示す図である。
FIG. 7 is a diagram showing a coloring spectrum of a light guide plate in a planar light source according to a third embodiment of the present invention.

【図8】本発明の第3の実施の形態に係る面状光源にお
ける発光源のスペクトルおよび照明光のスペクトルを示
す図である。
FIG. 8 is a diagram showing a spectrum of a light-emitting source and a spectrum of illumination light in a planar light source according to a third embodiment of the present invention.

【図9】本発明の第4の実施の形態に係る面状光源の構
成を示す図である。
FIG. 9 is a diagram illustrating a configuration of a planar light source according to a fourth embodiment of the present invention.

【図10】本発明の第5の実施の形態に係る面状光源の
構成を示す図である
FIG. 10 is a diagram showing a configuration of a planar light source according to a fifth embodiment of the present invention.

【図11】従来の面状光源の構成を示す図である。FIG. 11 is a diagram showing a configuration of a conventional planar light source.

【図12】図11に示す面状光源における発光源のスペ
クトル分布を示す図である。
12 is a diagram showing a spectrum distribution of a light emitting source in the planar light source shown in FIG.

【図13】図11に示す面状光源における発光源の色度
を示す図である。
13 is a diagram showing chromaticity of a light emitting source in the planar light source shown in FIG.

【符号の説明】[Explanation of symbols]

1 導光板 2 LED 3 LED基板 4 カラーフィルター 5 照明光 7 液晶パネル 10 面状光源 REFERENCE SIGNS LIST 1 light guide plate 2 LED 3 LED board 4 color filter 5 illumination light 7 liquid crystal panel 10 planar light source

───────────────────────────────────────────────────── 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) G02B 6/00 331 G02B 6/00 331 H01L 33/00 H01L 33/00 M ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G02B 6/00 331 G02B 6/00 331 H01L 33/00 H01L 33/00 M

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 発光光源および導光板を有し、発光光源
からの光を導光板により光路変換してその主面から照明
対象物に対し面状の照明光を出射する面状光源におい
て、前記発光光源は複数の波長成分よりなる発光色で発
光し、該面状光源は、光のスペクトルを補正する色補正
部品を備え、該色補正部品により前記発光光源の発光の
スペクトルを所望のスペクトルに補正して前記面状の照
明光として出射することを特徴とする面状光源。
1. A planar light source having a light-emitting light source and a light guide plate, wherein light from the light-emitting light source is converted into an optical path by a light guide plate, and planar light is emitted from a main surface of the light source to an object to be illuminated. The light-emitting light source emits light of an emission color composed of a plurality of wavelength components, the planar light source includes a color correction component for correcting a spectrum of light, and the color correction component changes the emission spectrum of the light-emitting light source to a desired spectrum. A planar light source which corrects and emits the planar illumination light.
【請求項2】 前記色補正部品の透光特性の色調は前記
発光光源の発光色の色調に対し略補色関係にあることを
特徴とする請求項1に記載の面状光源。
2. The planar light source according to claim 1, wherein the color tone of the light transmission characteristic of the color correction component is substantially complementary to the color tone of the emission color of the emission light source.
【請求項3】 前記色補正部品は着色された半透明材よ
りなる前記導光板であることを特徴とする請求項1又は
請求項2に記載の面状光源。
3. The planar light source according to claim 1, wherein the color correction component is the light guide plate made of a colored translucent material.
【請求項4】 前記色補正部品は前記発光光源と透明材
よりなる前記導光板の間に配設されたカラーフィルタで
あることを特徴とする請求項1又は請求項2に記載の面
状光源。
4. The planar light source according to claim 1, wherein the color correction component is a color filter disposed between the light emitting light source and the light guide plate made of a transparent material.
【請求項5】 前記色補正部品は透明材よりなる前記導
光板と前記照明対象物の間に配設されたカラーフィルタ
であることを特徴とする請求項1又は請求項2に記載の
面状光源。
5. The surface according to claim 1, wherein the color correction component is a color filter disposed between the light guide plate made of a transparent material and the illumination object. light source.
【請求項6】 前記発光光源は白色光源又は白色に近い
光源であることを特徴とする請求項1乃至請求項5のい
ずれかに記載の面状光源。
6. The planar light source according to claim 1, wherein the light emitting light source is a white light source or a light source close to white.
JP2000338245A 2000-11-06 2000-11-06 Flat light source Pending JP2002150821A (en)

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