JPH07114024A - Back light - Google Patents
Back lightInfo
- Publication number
- JPH07114024A JPH07114024A JP5260703A JP26070393A JPH07114024A JP H07114024 A JPH07114024 A JP H07114024A JP 5260703 A JP5260703 A JP 5260703A JP 26070393 A JP26070393 A JP 26070393A JP H07114024 A JPH07114024 A JP H07114024A
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- rays
- light guide
- backlight
- 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
Links
Landscapes
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、透過型又は、半透過型
パネルなどを背面より照射するエッジライト方式のバッ
クライトに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge light type backlight for illuminating a transmissive or semi-transmissive panel from the back surface.
【０００２】[0002]
【従来の技術】近時、ラップトップ型又は、ブック型の
ワ−ドプロセッサ−やコンピュ−タ等の表示装置とし
て、薄型でしかも見易いバックライト機構を持った液晶
表示装置が用いられている。このようなバックライトに
は、図１に示すように透光性の導光板（図中１）の一端
部に、蛍光管のような線状光源（図中４）を併設するエ
ッジライト方式がよく用いられている。このエッジライ
ト方式の場合、図２に示すように、導光板の一方の広い
面に光を拡散反射させる手段を形成し（図中６）、これ
によって導光板の出光面（図中光拡散シ−ト（図中２）
側）から光がまんべんなく出光されるように配置したも
のが多い。2. Description of the Related Art Recently, a liquid crystal display device having a thin and easy-to-read backlight mechanism has been used as a display device for a laptop or book type word processor, a computer or the like. For such a backlight, there is an edge light system in which a linear light source (4 in the figure) such as a fluorescent tube is provided at one end of a light-transmitting light guide plate (1 in the figure) as shown in FIG. It is often used. In the case of this edge light system, as shown in FIG. 2, a means for diffusing and reflecting light is formed on one wide surface of the light guide plate (6 in the figure), whereby the light exit surface of the light guide plate (the light diffusion plate in the figure) is formed. -To (2 in the figure)
Side) is often arranged so that the light is evenly emitted from the side.
【０００３】この様なエッジライト方式のバックライト
は、図３に例示したように導光板の端面部から光線を入
射させる方式であるが、通常は導光板の端面部に近接し
て光源を配置するために、その分（光源部分）の容積が
必要となり、バックライトの出光面近傍（すなわち、パ
ネルの表示面近傍）の小形化には限界があった。特に、
光線透過率がたかだか３〜４％しかないカラ−液晶ディ
スプレイや、発光面積が大きい壁掛けテレビやワ−クス
テ−ションの液晶ディスプレイでは、より多くの光線が
必要とされ、光源および光源の反射器の分だけディスプ
レイ近傍が大型化する問題があった。Such an edge-light type backlight is a system in which a light beam is incident from the end face portion of the light guide plate as illustrated in FIG. 3, but normally the light source is arranged close to the end face portion of the light guide plate. Therefore, a volume corresponding to that (light source portion) is required, and there is a limit to miniaturization in the vicinity of the light emitting surface of the backlight (that is, in the vicinity of the display surface of the panel). In particular,
In a color liquid crystal display having a light transmittance of at most 3 to 4%, a wall-mounted television having a large light emitting area or a liquid crystal display of a work station, more light rays are required, and a light source and a reflector of the light source are required. There was a problem that the vicinity of the display would be enlarged by that much.
【０００４】又、液晶ディスプレイの背面光源としてバ
ックライトが用いられた場合、液晶ディスプレイの性質
上面内で温度勾配（例えば２℃以上）が生じ、そのため
表示ムラが発生するので、光源付近に放熱板を配するこ
と等が提案されているが、その効果は充分ではなかっ
た。又、前記した表示ムラを防止するため光源を導光板
の端面部から可能な限り離すことも考えられるが、この
ようにすると必然的に導光板の外側部分の外形寸法を大
きくする必要がありバックライトの出光面近傍（すなわ
ち、パネルの表示面の面近傍）の小形化には好ましくな
かった。Further, when a backlight is used as a back light source of a liquid crystal display, a temperature gradient (for example, 2 ° C. or more) occurs in the upper surface of the liquid crystal display, which causes display unevenness. However, the effect was not sufficient. It is also possible to separate the light source from the end face of the light guide plate as much as possible in order to prevent the above-mentioned display unevenness, but this makes it necessary to increase the outer dimensions of the outer part of the light guide plate. It was not preferable for miniaturization in the vicinity of the light emitting surface of the light (that is, in the vicinity of the display surface of the panel).
【０００５】又、バックライトの薄型化のために導光板
の厚さを薄くすると当然導光板の端面部の面積も減少す
るので、光源から導光板への光の入射効率が低下し、バ
ックライトの効率（光源から出た光量に対するバックラ
イトから出る光量の割合）が低下する問題があった。Further, if the thickness of the light guide plate is made thinner to reduce the thickness of the backlight, the area of the end face portion of the light guide plate is naturally reduced, so that the incidence efficiency of light from the light source to the light guide plate is reduced, and the backlight is reduced. There is a problem that the efficiency (the ratio of the amount of light emitted from the backlight to the amount of light emitted from the light source) decreases.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的はより多
くの光線を導光板の端面部に入射させることが可能であ
り、従って高輝度で、かつ、バックライトの出光面近傍
（すなわち、パネルの表示面近傍）が比較的小形なバッ
クライトを提供することにある。SUMMARY OF THE INVENTION The object of the present invention is to allow more light rays to be incident on the end face portion of the light guide plate, so that the light source has high brightness and is close to the light emitting face of the backlight (that is, the panel). The vicinity of the display surface) provides a relatively small backlight.
【０００７】[0007]
【課題を解決するための手段】本発明者等は、面発光の
バックライトの導光板に対する光の入射方法について種
々の検討を行った結果、導光板への光の入射をある機構
を介して行うと、パネルの表示面近傍の外形寸法を比較
的小形に保ったまま、光源から発生する熱が面発光部に
殆ど伝導することがなく導光板の端面部から極めて多量
の光線を入射させることが出来、前記した目的に適った
比較的薄型の導光板も適応可能なバックライトとなるこ
とを見出した。Means for Solving the Problems As a result of various studies on the method of making light incident on a light guide plate of a surface-emission backlight, the present inventors have made it possible to make light enter the light guide plate through a mechanism. By doing so, the heat generated from the light source is hardly conducted to the surface light emitting part, and an extremely large amount of light is incident from the end face part of the light guide plate, while keeping the external dimensions in the vicinity of the display surface of the panel relatively small. It was found that a relatively thin light guide plate suitable for the above-mentioned purpose can be adapted as a backlight.
【０００８】即ち本発明は、光源から出射した光を導光
板の少なくとも一方の端面部から入射し導光板を面発光
させるバックライトにおいて、光源から出射した光を実
質的に平行な光線とし、この光線の進行方向を反射によ
り変更させ、方向変更した光線を実質的に平行でない光
線とする機構を持つことを特徴とするバックライトに関
するものである。次に本発明を図面に基づいて更に詳述
する。That is, according to the present invention, in a backlight in which light emitted from a light source is incident from at least one end face portion of the light guide plate and the light guide plate emits surface light, the light emitted from the light source is made into substantially parallel light rays. The present invention relates to a backlight which has a mechanism for changing the traveling direction of a light ray by reflection so that the changed light ray is not substantially parallel. Next, the present invention will be described in more detail with reference to the drawings.
【０００９】本発明の一実施態様を図４に示した。図中
１は導光板であり、光を効率よく通過させる物質であれ
ばよく、石英、ガラス、透光性の天然又は合成樹脂、例
えばアクリル系樹脂等である。ここで用いる導光板の形
状は対向した広い面の間で少なくとも一部の光が全反射
を繰り返すことができる形状であれば良く、対向した２
つの広い面どうしの向合う角度は、導光板材質の屈折率
と導光板に付随する物質等の屈折率によってその範囲が
決まる。従って、導光板の形状は厚さが一定な板状、厚
さが一定でないクサビ状又は曲面を持つものでも良く、
前記反射条件が満足されれば特に限定されない。One embodiment of the present invention is shown in FIG. In the figure, reference numeral 1 denotes a light guide plate, which may be any substance that allows light to pass efficiently, and is made of quartz, glass, translucent natural or synthetic resin such as acrylic resin. The shape of the light guide plate used here may be any shape as long as at least a part of light can be totally reflected repeatedly between the wide surfaces facing each other.
The range of the angle at which the two wide surfaces face each other is determined by the refractive index of the material of the light guide plate and the refractive index of the substance or the like attached to the light guide plate. Therefore, the shape of the light guide plate may be a plate shape with a constant thickness, a wedge shape with a non-uniform thickness, or a curved surface,
The reflection condition is not particularly limited as long as the reflection condition is satisfied.
【００１０】７は本発明で用いる光源で、本発明では導
光板の出光面と同一平面でない部分に配置されるが、好
ましくは導光板の比較的端部である。ここで用いる光源
は、点状光源、点状光源の配列体、線状光源（棒状光
源）などがあり、具体的にはメタルハライドランプ、ハ
ロゲン電球、ＬＥＤ、キセノン灯、水銀灯、ア−ク灯、
白熱電球、それらの配列体、蛍光管、タングステン白熱
管、オプティカルロッド等があが、特に液晶ディスプレ
イのバックライトとして用いる場合には発光効率、集光
効率及び色再現性の観点からメタルハライドランプ、ハ
ロゲン電球又はそれらを線状に配列したものが好まし
い。Reference numeral 7 denotes a light source used in the present invention. In the present invention, the light source is arranged in a portion which is not flush with the light exit surface of the light guide plate, but is preferably a relatively end portion of the light guide plate. The light source used here includes a point light source, an array of point light sources, a linear light source (rod-shaped light source), and the like. Specifically, a metal halide lamp, a halogen light bulb, an LED, a xenon lamp, a mercury lamp, an arc lamp,
There are incandescent light bulbs, their arrays, fluorescent tubes, tungsten incandescent tubes, optical rods, etc., but especially when used as a backlight for liquid crystal displays, metal halide lamps, halogens from the viewpoint of luminous efficiency, light collection efficiency and color reproducibility. Light bulbs or those in which they are arranged linearly are preferable.
【００１１】又、壁掛けテレビ等の大サイズで高輝度が
必要とされるような液晶ディスプレイのバックライトと
して用いる場合には、光源をＲ、Ｇ、Ｂの三色に分割し
ても良く、光源からの熱が液晶ディスプレイに更に伝わ
りにくくするために、赤外線除去フィルタ−を光源と導
光板との間に配置しても良い。When used as a backlight for a large-sized liquid crystal display such as a wall-mounted television which requires high brightness, the light source may be divided into three colors of R, G and B. An infrared ray removing filter may be arranged between the light source and the light guide plate in order to further prevent heat from the substrate from being transmitted to the liquid crystal display.
【００１２】尚、本発明の光源の位置は、ディスプレイ
への温度の影響を減少させるために導光板を挟んでディ
スプレイ側の反対側に設置することが導光板自体を断熱
材として利用する上で好ましいが、用いるディスプレイ
が温度の影響を殆ど受けない場合は光源の位置を導光板
のディスプレイ側に設置しても良い。The position of the light source of the present invention is to be installed on the opposite side of the display side with the light guide plate sandwiched in order to reduce the influence of temperature on the display in order to use the light guide plate itself as a heat insulating material. Although preferable, when the display used is hardly affected by temperature, the position of the light source may be installed on the display side of the light guide plate.
【００１３】８は光源から出射した光を実質的に平行な
光線にする機構の一種で、レンズ系により構成される。
このレンズ系は光源から出射した光を実質的に平行な光
線にする機能を有していれば良く、凸レンズ、フレネル
レンズ等のレンズを単独で又は複数組み合わせて形成さ
れ、レンズ系の焦点位置が実質的に光源に一致するよう
に配置すれば良い。レンズの材質は通常のレンズに用い
られる一般のガラスを用いれば良いが、光の利用効率の
観点から光線透過率が高いことが望ましく、好ましくは
透過率が８０％以上、より好ましくは９０％以上であ
り、光線透過率を更に向上させるために反射防止膜をレ
ンズの表面に形成しても良い。又、図９に示したよう
に、凸レンズを後述する反射機構と一体化して用いる
と、バックライトの小型化の面で好都合である。Reference numeral 8 is a kind of mechanism for converting the light emitted from the light source into substantially parallel light rays, and is composed of a lens system.
This lens system has only to have a function of converting light emitted from a light source into substantially parallel light beams, and is formed by a single lens or a combination of lenses such as a convex lens and a Fresnel lens, and the focal position of the lens system is It may be arranged so as to substantially match the light source. As the lens material, general glass used for ordinary lenses may be used, but it is desirable that the light transmittance is high from the viewpoint of light utilization efficiency, preferably 80% or more, more preferably 90% or more. Therefore, in order to further improve the light transmittance, an antireflection film may be formed on the surface of the lens. Further, as shown in FIG. 9, it is convenient to reduce the size of the backlight by using a convex lens integrally with a reflection mechanism described later.
【００１４】１２は反射系で、光源から出射した光を効
率良く導光板方向に伝達する機能を持つものであり、そ
の断面形状は円形、楕円形、等の形状を有しており、焦
点位置が光源の位置と実質的に一致している状態が好ま
しく、光源から出射した光を実質的に平行な光線にする
機能を有していれば良く、その断面形状がパラボラ状等
の反射器で形成され、反射した光線が実質的に平行な光
線となる形状を有しているものを用いる場合は、前述し
たレンズ系を省くことも可能である。A reflecting system 12 has a function of efficiently transmitting the light emitted from the light source toward the light guide plate, and has a cross-sectional shape such as a circle or an ellipse, and has a focal position. Is preferably substantially coincident with the position of the light source, as long as it has the function of making the light emitted from the light source substantially parallel rays, and its cross-sectional shape is a parabolic reflector. When using a lens having a shape in which the formed and reflected light rays are substantially parallel light rays, the lens system described above can be omitted.
【００１５】反射器の材質は通常の反射板に用いられる
アルミニウム、銀等の光線を鏡面反射する性質を有する
物質を用いれば良いが、光の利用効率の観点から光線反
射率が高いことが望ましく、好ましくは反射率が８０％
以上、より好ましくは８５％以上である。The material of the reflector may be a substance having a property of specularly reflecting light rays, such as aluminum and silver used in ordinary reflectors, and it is desirable that the light ray reflectance be high from the viewpoint of light utilization efficiency. , Preferably 80% reflectance
Or more, more preferably 85% or more.
【００１６】本発明で得る実質的に平行な光線の状態
は、後述する理由から完全に平行な状態でなくても良
い。そのため、前記レンズ系又は反射系は若干の収差が
生じるものであっても良く、このことはレンズ系、反射
系の簡略化に寄与し、ひいてはバックライトの小形化、
生産性の向上に寄与する。The state of substantially parallel rays obtained by the present invention does not have to be a completely parallel state for the reason described below. Therefore, the lens system or the reflection system may have some aberrations, which contributes to simplification of the lens system and the reflection system, which in turn reduces the size of the backlight.
Contributes to improved productivity.
【００１７】９は実質的に平行な光線の進行方向を変え
る反射機構、好ましくは全反射する機構で、その材質は
光を効率よく通過させる物質であればよく、石英、ガラ
ス、透光性の天然又は合成樹脂、例えばアクリル系樹脂
等である。又、光の透過率を更に向上させるために反射
防止膜を反射機構の光の入射面及び／又は出射面に形成
しても良い。Reference numeral 9 denotes a reflection mechanism for changing the traveling directions of substantially parallel light rays, preferably a total reflection mechanism, and the material thereof may be any substance that allows light to pass efficiently, such as quartz, glass and translucent materials. It is a natural or synthetic resin such as an acrylic resin. Further, in order to further improve the light transmittance, an antireflection film may be formed on the light incident surface and / or the light emitting surface of the reflection mechanism.
【００１８】光線の進行方向を変えるための反射面は、
光源方向から出た光線（実質的に平行な光線）の進行方
向と、変化した光線の進行方向とのなす角度θの半分の
角度でレンズ系から出射した光線の進行方向と交わる状
態にすることが必要である。又、光線の進行方向を変え
るための面は反射条件が保たれる範囲で多角形、円形の
一部にするなどしても良い。The reflecting surface for changing the traveling direction of the light beam is
It should be in a state where it intersects with the traveling direction of the light beam emitted from the lens system at an angle half the angle θ formed by the traveling direction of the light beam emitted from the light source direction (substantially parallel light beam) and the traveling direction of the changed light beam. is necessary. Further, the surface for changing the traveling direction of the light beam may be a part of a polygon or a circle as long as the reflection condition is maintained.
【００１９】本発明における反射機構は、レンズ系又は
反射系の近傍、即ちレンズ系又は反射系から出射する光
線の内で平行光線および平行光線とならない一部の光線
がほぼ反射機構に入射する距離に配置されることが好ま
しい。The reflection mechanism in the present invention is a distance in the vicinity of the lens system or the reflection system, that is, a distance at which a parallel light ray and a part of the light rays which are not parallel rays in the light rays emitted from the lens system or the reflection system are substantially incident on the reflection mechanism. Are preferably arranged in
【００２０】このように夫々を配置することによって、
図５に示したように、レンズ系又は反射系から出射する
光線のなかで平行でない一部の光線をも有効に利用する
ことができる。又、通常のミラ−（Ａｇでも反射率は９
３％程度）ではなく全反射（反射率１００％程度）機構
を用いることにより光の利用効率を高めることができ
る。By arranging each of these in this way,
As shown in FIG. 5, among the light rays emitted from the lens system or the reflection system, some light rays that are not parallel can be effectively used. In addition, a normal mirror (Ag has a reflectance of 9
The light utilization efficiency can be improved by using a total reflection (reflectance of about 100%) mechanism instead of a mechanism of about 3%.
【００２１】さらに、反射機構が所定の位置より若干異
なる位置にずれても、ミラ−を用いた場合のように反射
光線の進行方向に大幅なずれが生じることがないので、
組み立て公差を軽減する上で特に好ましい。Further, even if the reflecting mechanism is displaced to a position slightly different from the predetermined position, a large deviation does not occur in the traveling direction of the reflected light unlike the case of using a mirror.
Particularly preferable in reducing the assembly tolerance.
【００２２】１０、１１は反射機構からの光線を平行で
ない光線とする機構で、平行光線を平行でない光線に変
換する機能を持つものであれば良く、レンズ系（図中１
０）又は拡散板（図中１１）等を用い、前記反射機構と
導光板の入光端面部の間に配置される。レンズ系は、例
えば凸レンズ、凹レンズ、フレネルレンズ等のレンズを
単独又は複数枚組み合わせて形成されたもので、その材
質は通常のレンズに用いられる一般のガラスを用いれば
良いが、光の利用効率の観点から光線透過率が高いこと
が望ましく、好ましくは透過率が８０％以上、より好ま
しくは９０％以上のものであり、光線透過率を更に向上
させるために反射防止膜をレンズの表面に形成しても良
い。さらに、反射機構からの光線を平行でない光線にす
る手段が凸レンズ又は凸レンズの作用を有するフレネル
レンズを用いたレンズ系で、前記レンズ系の焦点（図中
１４）が実質的に導光板の入光端面部に一致しているこ
とが好ましい（図６（ｂ））。Numerals 10 and 11 are mechanisms for converting light rays from the reflection mechanism into non-parallel light rays, as long as they have a function of converting parallel light rays into non-parallel light rays, and a lens system (1 in the figure).
0) or a diffusion plate (11 in the figure) or the like, and is arranged between the reflection mechanism and the light incident end face portion of the light guide plate. The lens system is formed of a single lens or a combination of a plurality of lenses such as a convex lens, a concave lens, and a Fresnel lens, and the material thereof may be general glass used for ordinary lenses, but From the viewpoint, it is desirable that the light transmittance is high, preferably 80% or more, more preferably 90% or more, and an antireflection film is formed on the lens surface in order to further improve the light transmittance. May be. Further, the means for making the light rays from the reflection mechanism non-parallel rays is a lens system using a convex lens or a Fresnel lens having the function of a convex lens, and the focal point (14 in the figure) of the lens system is substantially the light incident on the light guide plate. It preferably coincides with the end face portion (FIG. 6 (b)).
【００２３】この様な状態にすることによって、光線を
可能な限り小さな面積に集中出来るので、光源から導光
板への光の入射効率を維持したまま導光板の厚さを可能
な限り薄くすることが出来、バックライトを薄型化出来
る。In such a state, the light rays can be concentrated on the smallest possible area. Therefore, the thickness of the light guide plate should be made as thin as possible while maintaining the incidence efficiency of the light from the light source to the light guide plate. The backlight can be made thinner.
【００２４】拡散板１１は入射した光を散乱させて透過
させる機能（すなわち、平行な光線を平行でない光線に
する作用）を有していれば良く、ポリメチルメタクリレ
ート（ＰＭＭＡ）、ポリカーボネイト（ＰＣ）、ガラス
等の透光性物質の表面を粗面にするか、内部に屈折率の
異なる物質を含有させる等で粗面としても良く、透光性
物質の表面にＳｉＯ2 、ガラスビ−ズ、樹脂ビ−ズ等を
多数存在させたものでも良いが、光の利用効率の観点か
ら光線透過率が高いことが望ましく、好ましくは透過率
が８０％以上、より好ましくは９０％以上のものであ
る。The diffusing plate 11 may have a function of scattering incident light and transmitting it (that is, an effect of converting parallel light rays into non-parallel light rays), and polymethyl methacrylate (PMMA) and polycarbonate (PC). The surface of a light-transmitting material such as glass may be roughened or may be roughened by containing a substance having a different refractive index therein, and the surface of the light-transmitting material is SiO 2 , glass beads, resin. Although a large number of beads and the like may be present, it is desirable that the light transmittance is high from the viewpoint of light utilization efficiency, and the transmittance is preferably 80% or more, more preferably 90% or more.
【００２５】平行光線を平行でない光線とする機構を設
けないと、図７に示したように、導光板の端面部には実
質的に平行な光線が入射するので、導光板を面発光させ
る機能が充分に働かない。なお、平行光線を平行でない
光線とする機構を、前記した実質的に平行な光線の進行
方向を変える反射機構の、導光板側の面を図８に示した
ように粗面化したりレンズ状、プリズム状にしたものを
用いて、レンズ系又は拡散板に代えても良い。この様な
状態にすると、バックライトの小形化の観点からは好ま
しい。Unless a mechanism for converting parallel light rays into non-parallel light rays is provided, as shown in FIG. 7, since substantially parallel light rays are incident on the end face portion of the light guide plate, the function of causing the light guide plate to emit surface light is achieved. Does not work well. The mechanism for converting parallel rays into non-parallel rays is a reflection mechanism for changing the traveling direction of the substantially parallel rays, and the surface on the light guide plate side is roughened or lens-shaped as shown in FIG. A prismatic one may be used instead of the lens system or the diffusing plate. Such a state is preferable from the viewpoint of downsizing the backlight.
【００２６】本発明で用いるレンズ系（図中８、１
０）、反射機構（同９）、拡散板（同１１）の入出光面
の射形状は、導光板の端面部の形状に対応した形状、即
ち長方形に対応した形状が好ましいが、上述した条件を
満足するものであれば特に限定されない。又、本発明
は、光源を含めたこれら機構は導光板の少なくとも一端
面部に配置すれば良い。The lens system used in the present invention (8, 1 in the figure)
0), the reflection mechanism (same as 9) and the diffusion plate (same as 11), the emission shape of the light entering / exiting surface is preferably a shape corresponding to the shape of the end face portion of the light guide plate, that is, a shape corresponding to a rectangle, but the above-mentioned conditions are satisfied. There is no particular limitation as long as the above condition is satisfied. Further, in the present invention, these mechanisms including the light source may be arranged on at least one end face portion of the light guide plate.
【００２７】本発明の主要部はこのような構成からなっ
ているが、導光板を面発光させる機能は通常次の方法で
付与される。即ち、光を拡散反射する性質を有する物
質、例えば、ＳｉＯ2 、ＢａＳＯ4 、ＴｉＯ2 等を含ん
だ塗料、印刷インキをスクリ−ン印刷等の方法で導光板
面上に印刷するなどして行う方法、導光板の表面を粗面
化して光が拡散反射する状態とする方法、導光板の表面
をフレネル状の段付き面にして光をある方向へ正反射さ
せる方法、導光板を屈折率の異なる２種以上の物質で形
成し光線が導光板内で散乱される状態にするなどの方法
である。The main part of the present invention has such a structure, but the function of causing the light guide plate to emit surface light is usually imparted by the following method. That is, a substance having a property of diffusively reflecting light, for example, a coating material containing SiO 2 , BaSO 4 , TiO 2 or the like, printing ink is printed on the light guide plate surface by a method such as screen printing. Method, a method of roughening the surface of the light guide plate to make the light diffusely reflected, a method of making the surface of the light guide plate a Fresnel stepped surface to specularly reflect the light in a certain direction, It is a method of forming a light beam in a light guide plate by using two or more different substances.
【００２８】２は光拡散板又は同シ−トで、導光板面よ
り出光した光を散乱させて通過させるものであり、この
光拡散板を必要に応じて一枚又は複数枚用いる。Reference numeral 2 is a light diffusing plate or the same sheet, which scatters the light emitted from the light guide plate surface and allows it to pass therethrough, and one or a plurality of such light diffusing plates are used as necessary.
【００２９】３は光反射板又は同シ−トで導光板の出光
面（液晶ディスプレイ側）とは反対側の導光板のほぼ全
面を覆うように配置する。又、導光板の光入射の端面部
以外の端面部を覆うように配置すると光の利用効率の点
で特に好ましい。Reference numeral 3 is a light reflection plate or the same sheet, and is arranged so as to cover almost the entire surface of the light guide plate on the side opposite to the light exit surface (on the liquid crystal display side) of the light guide plate. Further, it is particularly preferable in terms of light utilization efficiency to dispose the light guide plate so as to cover the end surface portion other than the light incident end surface portion.
【００３０】１５は光反射板又は同シ−トで、反射機構
から漏れた若干の光を更に有効利用するために、必要に
応じて空気層を介して反射機構のほぼ全面を覆うように
配置することが好ましい。又、１５を光拡散反射板又は
同シ−トとすれば、光の利用効率は更に向上する。Reference numeral 15 is a light reflection plate or the same sheet, which is arranged so as to cover almost the entire surface of the reflection mechanism through an air layer as necessary in order to further effectively use a little light leaked from the reflection mechanism. Preferably. If 15 is a light diffusing reflection plate or the same sheet, the light utilization efficiency is further improved.
【００３１】[0031]
【発明の効果】本発明は以上述べたような構成からな
り、パネル、特に液晶パネルのバックライトとして有用
である。又、本発明はより多くの光線を導光板の端面部
に入射させることが可能で、従って高輝度で、かつ、バ
ックライトの出光面近傍（すなわち、パネルの表示面近
傍）が比較的小形なバックライトとして使用できる。The present invention has the above-mentioned constitution and is useful as a backlight of a panel, particularly a liquid crystal panel. Further, according to the present invention, more light rays can be made incident on the end surface portion of the light guide plate, and therefore, the brightness is high and the vicinity of the light emitting surface of the backlight (that is, near the display surface of the panel) is relatively small. Can be used as a backlight.
【００３２】[0032]
【比較例及び実施例】次に比較例及び実施例で本発明を
更に詳述する。図２に示すようなＰＭＭＡからなる厚さ
４mmの長方形導光板（４１０mm×３１０mm…図中１）の
端面部に、直径４．１mm長さ３１０mmの冷陰極蛍光管
（図中４）を配置し、その管の外周を反射層がＡｇから
なる反射フィルム（図中５）で覆い、Ａｇフィルムの導
光板端部と対向する幅４mmのスリットから出光した光が
導光板の端部から導光板に入射するように配置した。COMPARATIVE EXAMPLES AND EXAMPLES Next, the present invention will be described in more detail with reference to Comparative Examples and Examples. A cold cathode fluorescent tube (4 in the figure) with a diameter of 4.1 mm and a length of 310 mm is arranged on the end face of a rectangular light guide plate (410 mm × 310 mm ... 1 in the figure) made of PMMA and having a thickness of 4 mm as shown in FIG. , The outer circumference of the tube is covered with a reflective film (5 in the figure) whose reflective layer is made of Ag, and the light emitted from the slit with a width of 4 mm facing the end of the light guide plate of the Ag film travels from the end of the light guide plate to the light guide plate. It was arranged so as to be incident.
【００３３】一方、導光板面上には光拡散反射物質（チ
タニア）を含むインクを円形のドットパタ−ンで１mmピ
ッチでスクリ−ン印刷し（図中６）、スクリ−ン版下
は、下記の条件でＣＡＤを用いて作成した。光拡散反射
物質の被覆率は、最小の地点（線状光源近傍）で２０
％、最大の地点で９５％とし、その中間は、被覆率最小
の地点からこの比率が順次増加するように作図した。On the other hand, on the surface of the light guide plate, an ink containing a light diffusing and reflecting substance (titania) was screen printed with a circular dot pattern at a pitch of 1 mm (6 in the figure). It was created using CAD under the conditions of. The light diffusive reflection material coverage is 20 at the minimum point (near the linear light source).
%, And 95% at the maximum point, and in the middle, the ratio was sequentially increased from the point with the minimum coverage.
【００３４】厚さ０．１３mmのポリエステルからなる白
色の光拡散反射シ−ト（図中３）は導光板の光拡散反射
物質を被覆した面の全面を覆うように配置した。厚さ
０．１８mmのポリカ−ボネ−トからなる光拡散板（図中
２）は粗面側が導光板側とは反対側になるようにして、
導光板の出光面の全面を覆うように配置した。A white light diffuse reflection sheet (3 in the figure) made of polyester having a thickness of 0.13 mm was arranged so as to cover the entire surface of the light guide plate coated with the light diffuse reflection material. The light diffusing plate (2 in the figure) made of polycarbonate with a thickness of 0.18 mm has the rough surface side opposite to the light guide plate side.
The light guide plate was arranged so as to cover the entire light emitting surface.
【００３５】冷陰極管を駆動（ランプ電力３Ｗ）させた
ときの面輝度を、輝度計により測定した。このとき、光
拡散反射物質を印刷した部分（図中６）が発光し、そこ
から出た光が光拡散板によって散乱透過され均一な面状
発光の状態が得られた。また、上記バックライトをカラ
−液晶ディスプレイにセットしたところ、輝度が低く実
用には耐えられないものであり、冷陰極管近傍に温度上
昇による表示ムラが観測された。このときの液晶ディス
プレイ上の温度勾配は４℃であった。なお、現状の技術
ではバックライトの高輝度化のため前記冷陰極管に１８
Ｗもの電力を消費させることは不可能である。（比較例
１） 次に図３（ｂ）に示したように、冷陰極管とその外周の
Ａｇフィルムを導光板の出光面の反対側端部の広い面に
配置した以外は比較例１と同様の条件でバックライトを
構成した。このとき、冷陰極管からの光線がそのまま導
光板を透過し、冷陰極管の直上が極めて高輝度な状態に
なった。また、光拡散反射物質を印刷した部分は殆ど発
光せず、従って、均一な面状発光の状態は得られなかっ
た。この原因は、スネルの法則からも考察されるが、冷
陰極管から導光板に入射した光線が導光板内では殆ど全
反射しなかったためと考えられる。このようなバックラ
イトは面状発光しないのでバックライトとして使用でき
なかった。（比較例２） 次に図３（ｃ）に示したように、導光板の形状を端部を
９０度折曲げたようにした以外は比較例１と同様の条件
でバックライトを構成した。このとき、冷陰極管からの
光線がそのまま導光板を透過し、冷陰極管の直上が極め
て高輝度な状態になった。また、光拡散反射物質を印刷
した部分は僅かに発光したが、導光板の出光面において
均一な面状発光の状態は得られなかった。この原因は、
冷陰極管から導光板に入射した光線が導光板内では殆ど
全反射しなかったためと考えられる。このようなバック
ライトは光の利用効率が極めて低く均一に面状発光しな
いので、バックライトとして使用できなかった。（比較
例３） 次に図４（ａ）に示したように、凸レンズ（図中８）の
焦点位置にハロゲン電球（図中７）を設置し、光源から
出射した光が実質的に平行な光線になるようにこれらを
配置し、実質的に平行な光線はＰＭＭＡからなるプリズ
ム部を有する導光体（反射機構…図中９）に入射するよ
うに設置した。また、導光体と導光板の端面部との間
に、導光体から出射した光線を平行でない光線にするた
めに、凸レンズ（図中１０）を配置し、光線が導光板の
端面部の中央部分から入射するように配置した。導光板
上の光拡散物質の被覆率は、光線の入射部からの距離が
大きくなるに従って大きくなるように修正した以外は比
較例３と同様の条件でバックライトを構成した。The surface luminance when the cold cathode tube was driven (lamp power 3 W) was measured by a luminance meter. At this time, the portion (6 in the figure) printed with the light diffusive and reflective material emitted light, and the light emitted therefrom was scattered and transmitted by the light diffusing plate, and a uniform planar light emission state was obtained. When the above backlight was set on a color liquid crystal display, the brightness was low and it could not be practically used, and display unevenness due to temperature rise was observed near the cold cathode tube. At this time, the temperature gradient on the liquid crystal display was 4 ° C. In the current technology, the cold cathode fluorescent lamp is used in order to increase the brightness of the backlight.
It is impossible to consume as much power as W. (Comparative Example 1) Next, as shown in FIG. 3B, Comparative Example 1 was prepared except that the cold cathode tube and the Ag film on the outer periphery thereof were arranged on the wide surface at the end opposite to the light emitting surface of the light guide plate. A backlight was constructed under similar conditions. At this time, the light beam from the cold cathode tube was transmitted through the light guide plate as it was, and the state immediately above the cold cathode tube became extremely high in brightness. Further, the portion printed with the light diffusive / reflecting material hardly emitted light, so that a uniform planar light emission state could not be obtained. The reason for this is considered to be Snell's law, but it is considered that the light rays incident on the light guide plate from the cold cathode tubes were hardly totally reflected in the light guide plate. Such a backlight cannot be used as a backlight because it does not emit planar light. Comparative Example 2 Next, as shown in FIG. 3C, a backlight was constructed under the same conditions as in Comparative Example 1 except that the end portion of the light guide plate was bent at 90 degrees. At this time, the light beam from the cold cathode tube was transmitted through the light guide plate as it was, and the state immediately above the cold cathode tube became extremely high in brightness. Further, although a slight amount of light was emitted from the portion printed with the light diffusive and reflective material, a uniform planar light emission state could not be obtained on the light emitting surface of the light guide plate. The cause is
It is considered that the light rays incident on the light guide plate from the cold cathode tubes were hardly totally reflected inside the light guide plate. Such a backlight cannot be used as a backlight because it has extremely low light utilization efficiency and does not uniformly emit planar light. Comparative Example 3 Next, as shown in FIG. 4A, a halogen bulb (7 in the figure) is installed at the focal position of the convex lens (8 in the figure), and the light emitted from the light source is substantially parallel. These were arranged so as to become light rays, and substantially parallel light rays were installed so as to enter a light guide body (reflection mechanism ... 9 in the figure) having a prism portion made of PMMA. In addition, a convex lens (10 in the figure) is arranged between the light guide and the end surface of the light guide plate in order to make the light emitted from the light guide not parallel, and the light is directed toward the end surface of the light guide plate. It was arranged so as to enter from the central portion. A backlight was constructed under the same conditions as in Comparative Example 3 except that the coverage of the light diffusing substance on the light guide plate was adjusted to increase as the distance from the incident part of the light beam increased.
【００３６】ハロゲン電球を駆動（ランプ電力２０Ｗ）
させたときの導光板の出光面における面輝度を輝度計に
より測定したが、均一な面状発光の状態であった。ま
た、このバックライトをカラ−液晶ディスプレイにセッ
トしたところ、輝度が高く充分実用に耐えられるもので
あり、導光板の光線入射端部に温度による表示ムラは観
測されなかった。（実施例１） 次に図４（ｂ）に示したように、導光体（図中９）から
出射した光線を平行でない光線にするために、凸レンズ
に代えて表面を粗面にした板状のＰＭＭＡの拡散板（図
中１１）を配置した以外は実施例１と同様の条件でバッ
クライトを構成し同様に面輝度を測定したが、均一な面
状発光の状態であった。また、このバックライトをカラ
−液晶ディスプレイにセットしたところ、輝度が高く充
分実用に耐えられるものであり、導光板の光線入射端部
に温度による表示ムラは観測されなかった。（実施例
２） 次に図６（ｂ）に示したように、導光体と導光板の端面
部との間に配置した凸レンズ（図中１０）の焦点位置に
導光板の端面部を配置した以外は実施例１と同様の条件
でバックライトを構成し同様に面輝度を測定したが、均
一な面状発光の状態であった。また、上記バックライト
をカラ−液晶ディスプレイにセットしたところ、輝度が
実施例１よりも向上した。また、導光板の光線入射端部
に温度による表示ムラは観測されなかった。（実施例
３） 次に図７に示したように、導光体から出射した光線を平
行でない光線にするための手段を配置しなかった以外は
実施例１と同様の条件でバックライトを構成し、同様に
面輝度を測定したが、均一には面状発光せず、輝度が極
端に低下しバックライトとして使用できなかった。（比
較例４） 次に図８（ａ）に示したように、導光体の光入射端面部
の表面を粗面化した以外は比較例４と同様の条件でバッ
クライトを構成し、同様に面輝度を測定したが、均一な
面状発光の状態であった。また、このバックライトをカ
ラ−液晶ディスプレイにセットしたところ、輝度が高く
充分実用に耐えられるものであった。また、導光板の光
線入射端部近傍の出光面には温度による表示ムラは観測
されなかった。また、実施例１〜３と比較すると導光体
から出射した光線を平行でない光線にするため部品点数
が減少し、その分バックライトの外形寸法が小さくなっ
た。（実施例４）Driving a halogen bulb (lamp power 20 W)
The surface brightness on the light exit surface of the light guide plate when measured was measured with a luminance meter, and it was in a state of uniform planar light emission. When this backlight was set on a color liquid crystal display, it had a high luminance and could withstand practical use, and no display unevenness due to temperature was observed at the light incident end of the light guide plate. Example 1 Next, as shown in FIG. 4B, a plate having a rough surface instead of a convex lens in order to make a light beam emitted from a light guide (9 in the drawing) not parallel A backlight was constructed under the same conditions as in Example 1 except that a PMMA diffuser plate (11 in the figure) was arranged, and the surface luminance was measured in the same manner, but a uniform surface emission was observed. When this backlight was set on a color liquid crystal display, it had a high luminance and could withstand practical use, and no display unevenness due to temperature was observed at the light incident end of the light guide plate. Example 2 Next, as shown in FIG. 6B, the end face portion of the light guide plate is arranged at the focal position of the convex lens (10 in the figure) arranged between the light guide and the end face portion of the light guide plate. A backlight was constructed under the same conditions as in Example 1 except that the above was performed, and the surface luminance was measured in the same manner, but a uniform planar light emission state was obtained. When the above backlight was set on a color liquid crystal display, the brightness was improved as compared with Example 1. Further, no display unevenness due to temperature was observed at the light incident end of the light guide plate. (Example 3) Next, as shown in FIG. 7, a backlight was constructed under the same conditions as in Example 1 except that no means for arranging the light rays emitted from the light guide body into non-parallel light rays was arranged. Then, the surface brightness was measured in the same manner, but the surface light emission was not uniform, and the brightness was extremely lowered, and it could not be used as a backlight. (Comparative Example 4) Next, as shown in FIG. 8A, a backlight was constructed under the same conditions as in Comparative Example 4 except that the surface of the light incident end face portion of the light guide was roughened. The surface luminance was measured, and it was in a state of uniform planar light emission. Further, when this backlight was set on a color liquid crystal display, it had a high luminance and was sufficiently durable for practical use. Further, no display unevenness due to temperature was observed on the light emitting surface near the light incident end of the light guide plate. Further, compared with Examples 1 to 3, since the light beam emitted from the light guide body is not a parallel light beam, the number of parts is reduced, and the external dimensions of the backlight are reduced accordingly. (Example 4)
【図１】従来のバックライトの斜視図FIG. 1 is a perspective view of a conventional backlight.
【図２】従来のバックライトの断面図FIG. 2 is a sectional view of a conventional backlight.
【図３】導光板に対する光の入射部分の違いによる光の
挙動の違いを示す図FIG. 3 is a diagram showing a difference in behavior of light due to a difference in a light incident portion on a light guide plate.
【図４】本発明のバックライトの一実施態様の断面図FIG. 4 is a sectional view of one embodiment of the backlight of the present invention.
【図５】平行でない光線の挙動を示す図FIG. 5 is a diagram showing the behavior of non-parallel light rays.
【図６】焦点位置と導光板の関係を示す図FIG. 6 is a diagram showing a relationship between a focus position and a light guide plate.
【図７】平行光線が導光板に入射した場合の挙動を示す
図FIG. 7 is a diagram showing a behavior when parallel light rays are incident on a light guide plate.
【図８】導光体の表面を粗面化、凸化、凹化した場合の
光線の挙動を示す図FIG. 8 is a diagram showing the behavior of light rays when the surface of the light guide body is roughened, convexized, or concaved.
【図９】導光体の表面を粗面化、凸化、凹化した場合の
光線の挙動を示す図FIG. 9 is a diagram showing the behavior of light rays when the surface of the light guide body is roughened, convexized, or concaved.
１：導光板 ２：光拡散板又は同シ−ト ３：光反射板又は同シ−ト ４：線状光源 ５：光反射板又は同シ−ト ６：光散乱物質 ７：光源 ８：レンズ ９：導光体（反射機構） １０：レンズ １１：拡散板 １２：反射器 １３：光線 １４：焦点 １５：反射板 1: Light guide plate 2: Light diffusing plate or sheet 3: Light reflecting plate or sheet 4: Linear light source 5: Light reflecting plate or sheet 6: Light scattering substance 7: Light source 8: Lens 9: Light guide (reflection mechanism) 10: Lens 11: Diffuser 12: Reflector 13: Ray 14: Focus 15: Reflector
Claims (3)
一方の端面部から入射し導光板を面発光させるバックラ
イトにおいて、光源から出射した光を実質的に平行な光
線とし、この光線の進行方向を反射により変更させ、方
向変更した光線を実質的に平行でない光線とする機構を
持つことを特徴とするバックライト。1. In a backlight in which light emitted from a light source is incident from at least one end face portion of a light guide plate to cause surface emission of the light guide plate, the light emitted from the light source is made into substantially parallel light rays, and the light rays travel. A backlight characterized by having a mechanism that changes the direction by reflection and makes the changed light beam not substantially parallel.
体である請求項１記載のバックライト。2. The backlight according to claim 1, wherein the reflection mechanism is a light guide having a prism or a curved surface.
する機構が凸レンズ又は凸レンズの作用を有するフレネ
ルレンズを用いたレンズ系であり、前記レンズ系の焦点
が導光板の入光端面部に実質的に一致させたものである
請求項１又は２記載のバックライト。3. A lens system that uses a convex lens or a Fresnel lens having a function of a convex lens as a mechanism for making a reflected light beam not to be a substantially parallel light beam, and the focal point of the lens system is at the light incident end face portion of the light guide plate. The backlight according to claim 1, wherein the backlights are substantially matched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5260703A JPH07114024A (en) | 1993-10-19 | 1993-10-19 | Back light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5260703A JPH07114024A (en) | 1993-10-19 | 1993-10-19 | Back light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07114024A true JPH07114024A (en) | 1995-05-02 |
Family
ID=17351602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5260703A Pending JPH07114024A (en) | 1993-10-19 | 1993-10-19 | Back light |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07114024A (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998013709A1 (en) * | 1996-09-24 | 1998-04-02 | Seiko Epson Corporation | Illuminating device and display using the device |
| JP2001343532A (en) * | 2000-03-31 | 2001-12-14 | Mitsubishi Electric Corp | Front-light, reflective liquid crystal display device and portable information terminal |
| JP2002270023A (en) * | 2001-03-14 | 2002-09-20 | Matsushita Electric Ind Co Ltd | Surface emitting device |
| US6636283B2 (en) | 2000-03-31 | 2003-10-21 | Mitsubishi Denki Kabushiki Kaisha | Front light, reflective liquid crystal display device and personal digital assistant |
| JP2007054481A (en) * | 2005-08-26 | 2007-03-08 | Omron Corp | Decoration device and game machine |
| US7188989B2 (en) | 2002-12-20 | 2007-03-13 | Citizen Electronics Co., Ltd. | Light guide plate and support unit for the same |
| KR100834980B1 (en) * | 2006-01-03 | 2008-06-03 | 포워드 일렉트로닉스 컴퍼니 리미티드 | Backlight Module for Flat Panel Display Device |
| JP2008543004A (en) * | 2005-05-31 | 2008-11-27 | オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Lighting device |
| JP2009009707A (en) * | 2007-06-26 | 2009-01-15 | Nikon Corp | Illumination light source device, liquid crystal display device, and projector |
| JP2009211858A (en) * | 2008-03-03 | 2009-09-17 | Fujikura Ltd | Method of introducing light into light-emitting light guide |
| JP2010071931A (en) * | 2008-09-22 | 2010-04-02 | Fujifilm Corp | Radiographic apparatus |
| JP2010251002A (en) * | 2009-04-13 | 2010-11-04 | Sharp Corp | Light irradiation device |
| JP2010287548A (en) * | 2009-06-15 | 2010-12-24 | Ccs Inc | Light irradiation device |
| JP2011014544A (en) * | 2010-08-25 | 2011-01-20 | Nikon Corp | Liquid crystal display lighting system |
| JP2011076858A (en) * | 2009-09-30 | 2011-04-14 | Koito Mfg Co Ltd | Vehicular lighting fixture |
| JP2013502692A (en) * | 2009-08-21 | 2013-01-24 | マイクロソフト コーポレーション | Concentrator for illumination optics |
| KR20130053061A (en) * | 2011-11-14 | 2013-05-23 | 엘지디스플레이 주식회사 | Light guiding plate, backlight unit and liquid crystal display device using the sames |
| JP2015060084A (en) * | 2013-09-19 | 2015-03-30 | ウシオ電機株式会社 | Light guide body and laser light source device |
-
1993
- 1993-10-19 JP JP5260703A patent/JPH07114024A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998013709A1 (en) * | 1996-09-24 | 1998-04-02 | Seiko Epson Corporation | Illuminating device and display using the device |
| JP2001343532A (en) * | 2000-03-31 | 2001-12-14 | Mitsubishi Electric Corp | Front-light, reflective liquid crystal display device and portable information terminal |
| US6636283B2 (en) | 2000-03-31 | 2003-10-21 | Mitsubishi Denki Kabushiki Kaisha | Front light, reflective liquid crystal display device and personal digital assistant |
| JP4501295B2 (en) * | 2001-03-14 | 2010-07-14 | パナソニック株式会社 | Surface emitting device |
| JP2002270023A (en) * | 2001-03-14 | 2002-09-20 | Matsushita Electric Ind Co Ltd | Surface emitting device |
| US7188989B2 (en) | 2002-12-20 | 2007-03-13 | Citizen Electronics Co., Ltd. | Light guide plate and support unit for the same |
| KR101236401B1 (en) * | 2005-05-31 | 2013-02-22 | 오스람 옵토 세미컨덕터스 게엠베하 | Illumination device |
| JP2008543004A (en) * | 2005-05-31 | 2008-11-27 | オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Lighting device |
| JP4650165B2 (en) * | 2005-08-26 | 2011-03-16 | オムロン株式会社 | Decoration device and game machine |
| JP2007054481A (en) * | 2005-08-26 | 2007-03-08 | Omron Corp | Decoration device and game machine |
| KR100834980B1 (en) * | 2006-01-03 | 2008-06-03 | 포워드 일렉트로닉스 컴퍼니 리미티드 | Backlight Module for Flat Panel Display Device |
| JP2009009707A (en) * | 2007-06-26 | 2009-01-15 | Nikon Corp | Illumination light source device, liquid crystal display device, and projector |
| JP2009211858A (en) * | 2008-03-03 | 2009-09-17 | Fujikura Ltd | Method of introducing light into light-emitting light guide |
| JP2010071931A (en) * | 2008-09-22 | 2010-04-02 | Fujifilm Corp | Radiographic apparatus |
| JP2010251002A (en) * | 2009-04-13 | 2010-11-04 | Sharp Corp | Light irradiation device |
| JP2010287548A (en) * | 2009-06-15 | 2010-12-24 | Ccs Inc | Light irradiation device |
| JP2013502692A (en) * | 2009-08-21 | 2013-01-24 | マイクロソフト コーポレーション | Concentrator for illumination optics |
| JP2011076858A (en) * | 2009-09-30 | 2011-04-14 | Koito Mfg Co Ltd | Vehicular lighting fixture |
| JP2011014544A (en) * | 2010-08-25 | 2011-01-20 | Nikon Corp | Liquid crystal display lighting system |
| KR20130053061A (en) * | 2011-11-14 | 2013-05-23 | 엘지디스플레이 주식회사 | Light guiding plate, backlight unit and liquid crystal display device using the sames |
| JP2015060084A (en) * | 2013-09-19 | 2015-03-30 | ウシオ電機株式会社 | Light guide body and laser light source device |
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